WO2013171053A1 - Pump device - Google Patents

Pump device Download PDF

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Publication number
WO2013171053A1
WO2013171053A1 PCT/EP2013/058706 EP2013058706W WO2013171053A1 WO 2013171053 A1 WO2013171053 A1 WO 2013171053A1 EP 2013058706 W EP2013058706 W EP 2013058706W WO 2013171053 A1 WO2013171053 A1 WO 2013171053A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
connection
accordance
pump device
fluid
Prior art date
Application number
PCT/EP2013/058706
Other languages
French (fr)
Inventor
Karsten Laing
Original Assignee
Xylem Ip Holdings Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xylem Ip Holdings Llc filed Critical Xylem Ip Holdings Llc
Publication of WO2013171053A1 publication Critical patent/WO2013171053A1/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/003Having contrarotating parts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06Multi-stage pumps
    • F04D1/063Multi-stage pumps of the vertically split casing type
    • F04D1/066Multi-stage pumps of the vertically split casing type the casing consisting of a plurality of annuli bolted together
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00Pumping installations or systems
    • F04D13/02Units comprising pumps and their driving means
    • F04D13/06Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0673Units comprising pumps and their driving means the pump being electrically driven the motor being of the inside-out type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00Pumping installations or systems
    • F04D13/12Combinations of two or more pumps
    • F04D13/14Combinations of two or more pumps the pumps being all of centrifugal type

Definitions

  • the invention relates to a pump device for conveying a fluid, comprising a plurality of pump elements, which are each mounted for rotation about an axis of rotation, and which create a pressure difference by rotation about the axis of rotation.
  • Such pump devices are used, for example, for conveying a fluid from a borehole. Owing to the depth of many boreholes and to the pump device being held only by a riser pipe, the riser pipe is highly stressed by the starting torques that occur when starting up or switching off the pump device.
  • FR 2 678 987 Al discloses a multiple stage pump device comprising multiple pump modules.
  • US 6,811,382 B2 discloses a pump device comprising one or more stages each have an integrated pump and motor.
  • US 7,726,331 Bl discloses a modular fluid handling device including at least one block having a central bore and a fluid passage.
  • US 2001/0006611 Al discloses a reactor assembly comprising a substantially elongated tubular housing, at least one reactant inlet and, at least one reaction mixture outlet disposed above the at least one reactant inlet.
  • US 4,548,263 A discloses a fitting for use downhole in a well for connecting a pair of well pumps.
  • JP 58-124093 A discloses a submergible motor driven pump comprising three stacked pump units.
  • the object underlying the present invention is to provide a pump device having a reduced starting torque.
  • At least one of the pump elements has a direction of rotation which is opposite to the direction of rotation of at least one other pump element of the pump device.
  • the directions of rotation of two pump elements are, therefore, opposite, and so upon synchronous starting or stopping of the rotation of the pump elements, the starting torques occurring in the two pump elements
  • the reduction of the starting torques is also effective in the event of unusual or unexpected occurrences, for example, in the case of a fast emergency shutdown or a power failure.
  • a further favorable solution provides for the axes of rotation of the pump elements of the pump device to extend substantially parallel to one another, as the reduction in the starting torques is better with axes of rotation which extend parallel than with axes which do not extend parallel. It is particularly favorable if the axes of rotation of the pump elements of the pump device are arranged coaxially with one another. With a coaxial arrangement of two counter-rotating pump elements can the starting torques be completely reduced.
  • a further advantageous solution provides for the axes of rotation of the pump elements of the pump device to extend substantially parallel to a pumping direction of the pump device. This is advantageous because the dimensions of the pump device can in this way be adapted to a limited space, for example, within a borehole, and the available space can, therefore, be optimally used .
  • the pump device has an even number of pump elements. Then no pump element is left over whose starting torque cannot be compensated by another pump element.
  • a further particularly advantageous solution provides for the pump elements to have in pairs opposite directions of rotation. This makes compensation of the starting torques of the pump elements possible in pairs. It is particularly favorable if the pump elements of one half of the pump elements, seen in a pumping direction, rotate clockwise, and the pump elements of the other half of the pump elements, seen in a pumping direction, rotate counterclockwise. Then the starting torques of all pump elements, which occur when the pump elements are started up, cancel one another out.
  • the pump elements are flow pump elements, i.e., the pump elements use the forces that occur during the flow of the fluid generated by rotation of the pump elements to create a pressure difference.
  • the pump elements may be designed as impeller or propeller, for example.
  • a further advantageous possibility provides for the pump device to comprise at least one pump module having a housing, a fluid outlet and a fluid inlet, the at least one pump module comprising a first connection device for mechanical and hydraulic connection, which is arranged on a first connection side, and a second connection device for mechanical and hydraulic connection, which is arranged on a second connection side.
  • the thus achievable connectability to further pump modules enables the pumping capacity to be increased.
  • the achievable pressure can be multiplied by stacking a plurality of pump modules.
  • an elongated pump device which, for example, is ideally suited for use in a borehole, can be produced by the stackability of the pump modules.
  • a certain flow rate can be obtained by the choice of the type of the pump modules, and the pressure that is required to convey the fluid, for example, out of a borehole can be achieved by the number of the pump modules.
  • a further favorable solution provides for the at least one pump module to comprise at least one pump element for creating a pressure difference between the fluid inlet and the fluid outlet.
  • the pressure required for the particular purpose can thereby be generated, for example, in order to convey a fluid out of a borehole.
  • the at least one pump module comprises at least two pump elements for creating a pressure difference between the fluid inlet and the fluid outlet.
  • a pump module with a reduced starting torque can thereby be achieved.
  • a particularly favorable solution provides for the at least one pump module to comprise at least one drive. Owing to the at least one pump module having its own drive, the drive can be ideally attuned to the pump module, thereby making a more efficient construction achievable. Furthermore, the pump module can, as result, also be used singly. It is favorable if the at least one drive for driving the at least one pump element is coupled to the at least one pump element.
  • the drive comprises an external rotor motor, the external rotor of which is formed by the impeller.
  • a space-saving direct coupling between drive and pump element is thereby achievable.
  • the fluid inlet and the fluid outlet of the at least one pump module are aligned in an axial direction. It is thus possible to stack the pump modules one on top of the other so as to produce a straight stack which can be used at an operational site with limited space such as, for example, a borehole.
  • a particularly favorable solution provides for the fluid inlet of the at least one pump module to comprise a first fluid connection which is arranged on the first connection side, and for the fluid outlet of the at least one pump module to comprise a second fluid connection which is arranged on the second
  • connection sides extend substantially parallel, so that a straight stack is possible.
  • first fluid connection and the second fluid connection of the at least one pump module are complementary in design.
  • the second fluid connection can be connected to a first fluid connection of a further constructionally identical pump module.
  • a stacked arrangement of the pump modules is enabled by the fluid
  • connections of two pump modules being connectable to each other.
  • a further advantageous solution provides for the at least one pump module to comprise a first and a second connection device for mechanical, hydraulic and electrical connection.
  • the pump modules can thereby be mechanically, hydraulically and electrically connected to one another.
  • the at least one pump module comprises an electrical supply and transmission device which extends between the first connection side and the second connection side.
  • the pump modules are supplied with (electrical) energy, which is required for conveying the fluid, by means of the electrical supply and transmission device.
  • the electrical supply and transmission device may also be used for
  • Installation space can be saved by joint use of the supply and transmission device for a plurality of pump modules. This is particularly advantageous in working environments with limited space such as, for example, in boreholes.
  • the electrical supply and transmission device comprises a first electrical connection element which is arranged on the first connection side of the at least one pump module and a second electrical connection element which is arranged on the second connection side of the at least one pump module.
  • the electrical connection between stacked pump modules is thereby enabled . It is particularly favorable for the connection of two pump modules if the first electrical connection element and the second electrical connection element are complementary in design.
  • the second electrical connection of a pump module is thereby connectable to the first electrical connection of a further
  • the at least one pump module comprises at least one first mechanical connection element which is arranged on the first connection side and at least one second mechanical connection element which is arranged on the second connection side.
  • the mechanical connection elements enable the mechanical connection between the pump modules and can absorb the forces that occur, so that any existing fluid connection or any existing electrical connection is relieved.
  • the at least one first mechanical connection element is complementary in design to the at least one second mechanical connection element. The at least one second mechanical connection element is thereby connectable to at least one first mechanical connection element of a further constructionally identical pump module.
  • a particularly advantageous solution provides for the pump device to comprise at least two pump modules which are fluidically connected in series.
  • a further particularly favorable solution provides for the at least two pump modules to be mechanically and hydraulically connected .
  • a single group of components is thereby produced, which comprises the combined pumping capacities of the pump modules and, in addition, can be handled as a unit.
  • each pump module of the pump device It is favorable if conveyed fluid flows through each pump module of the pump device.
  • the at least two pump modules are electrically connected .
  • electrical energy or control signals can thus be passed on from pump module to pump module. It is particularly advantageous if the fluid outlet of a first pump module is fluidically connected to the fluid inlet of a second pump module.
  • a further advantageous solution provides for the pressure difference between the fluid inlet of a first pump module and the fluid outlet of a last pump module to correspond approximately to the sum of the pressure differences between the respective fluid inlet and the respective fluid outlet of the individually stacked pump modules.
  • the pump pressure can thus be adapted to the requirements of the intended use by the number of pump modules used .
  • each pump module comprises a drive for driving the pump element of the pump module.
  • the pump modules can be combined by stacking in order to meet the hydraulic requirements.
  • connection device is made available for connecting the modules hydraulically and electrically. Further features and advantages of the invention form the subject matter of the following description and drawings of embodiments.
  • FIG. 1 shows a perspective representation of an embodiment of a pump device in accordance with the invention
  • Figure 2 shows a vertical section through the pump device from Figure 1 taken through the sectional line 2-2
  • Figure 3 shows a perspective exploded view of the embodiment of the pump device
  • Figure 4 shows a side view of the embodiment of the pump device
  • Figure 5 shows a side view of the pump device from Figure 4, with the housings of the pump modules blanked out;
  • Figure 6 shows a side view of a second embodiment of the pump device with four pump modules
  • Figure 7 shows a side view of the pump device from Figure 6, with the housings of the pump modules blanked out;
  • Figure 8 shows a sectional representation of the second embodiment in accordance with Figure 6.
  • a pump device 10 shown in its entirety in Figure 1, for conveying a fluid 11 comprises a suction cover 12, a plurality of, for example, two, pump modules 14 and a pipe connection 16.
  • the suction cover 12 has a cylindrical wall 18 which is covered on a suction side 20 of the suction cover 12 by a perforated wall 22.
  • the perforated wall 22 has a plurality of openings 24 through which fluid can pass. The perforated wall 22 therefore creates a screening effect.
  • connection side 26 of the suction cover 12 Located opposite the suction side 20 is a connection side 26 of the suction cover 12.
  • a plurality of, for example, three, mechanical connection elements 28 are arranged on the outer side of the cylindrical wall 18 of the suction cover 12.
  • the suction cover is held on a first connection side 30 of a pump module 14 by means of the mechanical connection elements 28.
  • the pump module 14 comprises a substantially cylindrical housing 34 with a cylindrical outer wall 31.
  • the housing 34 comprises the first connection side 30 arranged at an end face and a second connection side 36 located opposite to and spaced in an axial direction 33 from the first connection side 30.
  • the first connection side 30 has a fluid inlet 38 arranged, for example, coaxially with the substantially cylindrical housing 34.
  • the first connection side 30 has a first connection device 40, which comprises a first fluid connection 42, a plurality of, for example, three, first mechanical connection elements 44 and a first electrical connection element 46.
  • the first fluid connection 42 is arranged at the fluid inlet 38, so that the fluid inlet 38 is connectable in a fluid-tight manner to a matching second fluid connection 58.
  • a corresponding, matching second fluid connection 58 may be arranged, for example, on a pipe connection 16, on a hose or on a further pump module 14.
  • the first mechanical connection elements 44 are arranged on the first connection side 30 outside of the fluid inlet 38.
  • the first mechanical connection elements 44 are arranged on the first connection side 30 outside of the fluid inlet 38.
  • connection elements 44 are designed for a mechanical connection, for example, for a releasable mechanical connection.
  • the first mechanical connection elements 44 may be of small plate-shaped
  • connection are, however, also possible such as, for example, clamping, adhesive bonding, welding, riveting, latching or the like.
  • the first mechanical connection elements 44 are suitable for connection both to other pump modules 14 and to the suction cover 12.
  • the first electrical connection element 46 is arranged outside of the circular base area of the cylindrical housing 34.
  • the first electrical connection element 46 has a crescent-shaped cross section 48, the inner boundary line 50 of which has a radius of curvature which corresponds to the radius of the cylindrical outer wall 31 of the housing 34, so that the first electrical connection element 46 can be placed on the cylindrical outer wall 31 of the housing 34.
  • the first electrical connection element 46 has, for example, a female plug connection for connection of a plurality of electrical conductors of an electrical supply and transmission device 52.
  • the electrical supply and transmission device 52 extends from the first connection side 30 of the pump module 14 to the second connection side 36 of the pump module 14. At the second connection side 36, the electrical supply and transmission device 52 continues into a second electrical connection element 54.
  • the second electrical connection element 54 is configured, for example, as a male plug for connection of a plurality of wires of the electrical supply and transmission device 52. Furthermore, the second electrical connection element 54 is complementary in design to the first electrical connection element 52, so that the first electrical connection element 52 is connectable to a second electrical connection element 54 of a further pump module 14.
  • a second connection device 56 Arranged on the second connection side 36 is a second connection device 56, which comprises the second electrical connection element 54, a second fluid connection 58 and a plurality of, for example, three, second mechanical connection elements 60.
  • the second fluid connection 58 is arranged at a fluid outlet 62 coaxially with the fluid inlet 38 and is designed for connection to a first fluid connection 42 of a further constructionally identical pump module 14.
  • the fluid outlet 62 can thus be connected in a fluid-tight manner to the fluid inlet 38 of a further pump module 14.
  • the fluid outlet 62 is arranged coaxially with the fluid inlet 38.
  • the spacing between fluid inlet 38 and fluid outlet 62 defines a pumping direction 63.
  • the second mechanical connection elements 60 are complementary in design to the first mechanical connection elements 44.
  • the second mechanical connection elements can thus be mechanically connected to first mechanical connection elements 44 of a further pump module 14.
  • the pump module 14 comprises a pump element 70, which is driven by a drive 72.
  • the drive 72 is, for example, an external rotor electric motor 74, on the external rotor of which the pump element 70 is arranged.
  • the pump element 70 is thus driven directly by the motor 74 without any transmission losses occurring, for example, via a gearing.
  • the axis of rotation 78 of the motor 74 and therefore also of the pump element 70 is substantially coaxial with the cylinder axis of the housing 34.
  • the diameter 80 of the external rotor 76 is smaller than an inner diameter 82 of the housing 34, and the depth of the external rotor 76 is less than the height of the housing 34, so that a free space 84 is formed within the housing 34 around the external rotor 76.
  • the free space 84 is used as fluid passage 86 between the fluid inlet 38 and the fluid outlet 62.
  • the pump element 70 comprises vane elements 88, which extend from the external rotor 76 into the free space 84 without touching the housing 34.
  • the fluid 11 located in the free space 84 is made to rotate together with the pump element 70 by the vane elements 88.
  • the fluid passage 86 comprises three regions, a radially extending pressure generation region 90, an axially extending transition region 92 and a radially extending return flow region 94.
  • the pressure generation region 90 extends from the fluid inlet between the first connection side 30 and the external rotor 76 radially outwardly. In this region, the fluid 11 is made to rotate by the vane elements 88 of the pump element 70.
  • the centrifugal forces occurring due to the rotation generate a radial pressure gradient in the fluid 11, with the pressure near the axis of rotation 78 being lower than at the cylindrical outer wall 31 of the housing 34.
  • the transition region 92 extends from the first connection side 30 in the axial direction 33 to the second connection side 36 between the cylindrical outer wall 31 of the housing 34 and the external rotor 76.
  • curved vane elements 96 are arranged on the external rotor 76, which ensure that the fluid 11 is pushed by the rotation of the pump element 70 in the axial direction 33 to the second connection side 36.
  • straight vane elements 88 may be arranged on the external rotor 76 in the transition region 92, so that the pump element 70 is
  • the return flow region 94 extends between the second connection side 36 of the housing 34 and the external rotor 76 radially from the cylindrical outer wall 31 of the housing 34 to the fluid outlet 62.
  • static vane elements 89 are arranged on the housing 34, which extend into the return flow region 94, so that the rotation of the fluid 11 is braked .
  • the rotation of the fluid in the return flow region 94 is at least lower than in the pressure generation region 90. Owing to the rotation of the fluid being reduced in the return flow region 94, the pressure gradient in the fluid along the return flow region 94 is lower than the pressure gradient in the pressure generation region 90. A pressure difference is thereby created between the fluid inlet and the fluid outlet.
  • the first embodiment of the pump device 10 comprises two pump modules 14, which are mechanically, hydraulically and electrically connected to each other, the second connection device 56 of the first pump module 14 being connected to the first connection device 40 of the second pump module 14.
  • the two pump modules 14 of the pump device 10 differ in that the two pump modules 14 have directions of rotation 64 which are opposite to each other. Accordingly, one of the pump modules 14 is, for example, a counterclockwise pump module 66, in which the pump element 70, seen in the pumping direction 63, rotates counterclockwise.
  • the other pump module 14 is a clockwise pump module 68, in which the pump element 70 rotates clockwise.
  • the suction cover 12 is arranged on the first connection device 40 of the first pump module 14 and held on the first mechanical connection elements, and a fluid-tight electrical end element 98 is connected to the first electrical connection element 46 of the first pump module 14.
  • a pipe connection 16 is connected to the second connection device 56 of the second pump module 14 and held on the second mechanical connection elements 60, and an electrical supply device 102 is connected to the second electrical connection element 54 of the second pump module 14.
  • fluid 11 entering the pump device 10 through the suction cover 12 is conducted through the first pump module 14 along the fluid passage 86, as a result of which the pressure within the fluid 11 increases.
  • the fluid 11 is then conducted through the fluid outlet 62 of the first pump module 14 into the fluid inlet 38 of the second pump module 14, and from there the fluid 11 passes through the fluid passage 86 of the second pump module 14, as a result of which the pressure within the fluid 11 increases further.
  • the pressure increase achieved can be adapted to different requirements by the number of pump modules 14 connected hydraulically in series within the pump device 10.
  • a pump device 10 with four pump modules 14 is possible, as shown in Figures 6 and 7.
  • a second embodiment, shown in Figure 8, of a pump device 10 differs from the first embodiment shown in Figures 1 to 7 in that the counter-rotation of two pump elements 70 is achieved by a first pump element 104 being driven by an inner shaft 106 and a second pump element 108 being driven by an outer hollow shaft 110.
  • the inner shaft 106 is arranged coaxially with the outer hollow shaft 110 and extends within the outer hollow shaft 110.
  • the inner shaft 106 extends from a first motor 112 to the first pump element 104.
  • the first motor drives the inner shaft 106 and by means of the latter the first pump element 104.
  • the outer hollow shaft 110 extends from the second pump element 108 to a second motor 114, and the second pump element 108 and the second motor 114 are arranged between the first pump element 104 and the first motor 112.
  • the second motor drives the outer hollow shaft 110 and by means of the latter the second pump element 108.
  • the first pump element 104 and the second pump element 108 can, therefore, be driven independently of each other, whereby a counter-rotation of the pump elements 70 is achievable, which leads to a reduction in the starting torque.
  • the second embodiment, shown in Figure 8 of the pump device 10 corresponds in terms of construction and operation to the first embodiment shown in Figures 1 to 7, to the above description of which reference is made for details thereof. List of Reference Numerals pump device

Abstract

To provide a pump device (10) for conveying a fluid (11), comprising a plurality of pump elements (70), which are each mounted for rotation about an axis of rotation (78), and which create a pressure difference by rotation about the axis of rotation, in which pump device the starting torque is reduced, it is proposed that at least one of the pump elements have a direction of rotation (64) which is opposite to the direction of rotation of at least one other pump element of the pump device.

Description

Pump Device
The present disclosure relates to the subject matter disclosed in German application number DE 10 2012 104 311.6 of May 18, 2012, which is incorporated herein by reference in its entirety and for all purposes.
BACKGROUND OF THE INVENTION
The invention relates to a pump device for conveying a fluid, comprising a plurality of pump elements, which are each mounted for rotation about an axis of rotation, and which create a pressure difference by rotation about the axis of rotation.
Such pump devices are used, for example, for conveying a fluid from a borehole. Owing to the depth of many boreholes and to the pump device being held only by a riser pipe, the riser pipe is highly stressed by the starting torques that occur when starting up or switching off the pump device.
DE 29 25 327 Al discloses a multiple stage pump device.
DE 88 10 330 Ul discloses a pump device with multiple stages. Each stage pumps a different loop.
FR 2 678 987 Al discloses a multiple stage pump device comprising multiple pump modules.
US 6,811,382 B2 discloses a pump device comprising one or more stages each have an integrated pump and motor. US 7,726,331 Bl discloses a modular fluid handling device including at least one block having a central bore and a fluid passage. US 2001/0006611 Al discloses a reactor assembly comprising a substantially elongated tubular housing, at least one reactant inlet and, at least one reaction mixture outlet disposed above the at least one reactant inlet. US 4,548,263 A discloses a fitting for use downhole in a well for connecting a pair of well pumps.
JP 58-124093 A discloses a submergible motor driven pump comprising three stacked pump units.
The object underlying the present invention is to provide a pump device having a reduced starting torque.
SUMMARY OF THE INVENTION
The object is accomplished, in accordance with the invention, in that at least one of the pump elements has a direction of rotation which is opposite to the direction of rotation of at least one other pump element of the pump device. The directions of rotation of two pump elements are, therefore, opposite, and so upon synchronous starting or stopping of the rotation of the pump elements, the starting torques occurring in the two pump elements
compensate each other. The reduction of the starting torques is also effective in the event of unusual or unexpected occurrences, for example, in the case of a fast emergency shutdown or a power failure.
A further favorable solution provides for the axes of rotation of the pump elements of the pump device to extend substantially parallel to one another, as the reduction in the starting torques is better with axes of rotation which extend parallel than with axes which do not extend parallel. It is particularly favorable if the axes of rotation of the pump elements of the pump device are arranged coaxially with one another. With a coaxial arrangement of two counter-rotating pump elements can the starting torques be completely reduced.
A further advantageous solution provides for the axes of rotation of the pump elements of the pump device to extend substantially parallel to a pumping direction of the pump device. This is advantageous because the dimensions of the pump device can in this way be adapted to a limited space, for example, within a borehole, and the available space can, therefore, be optimally used .
It is particularly favorable if the pump device has an even number of pump elements. Then no pump element is left over whose starting torque cannot be compensated by another pump element.
A further particularly advantageous solution provides for the pump elements to have in pairs opposite directions of rotation. This makes compensation of the starting torques of the pump elements possible in pairs. It is particularly favorable if the pump elements of one half of the pump elements, seen in a pumping direction, rotate clockwise, and the pump elements of the other half of the pump elements, seen in a pumping direction, rotate counterclockwise. Then the starting torques of all pump elements, which occur when the pump elements are started up, cancel one another out.
Furthermore, a favorable solution provides for the pump elements to be flow pump elements, i.e., the pump elements use the forces that occur during the flow of the fluid generated by rotation of the pump elements to create a pressure difference.
The pump elements may be designed as impeller or propeller, for example. A further advantageous possibility provides for the pump device to comprise at least one pump module having a housing, a fluid outlet and a fluid inlet, the at least one pump module comprising a first connection device for mechanical and hydraulic connection, which is arranged on a first connection side, and a second connection device for mechanical and hydraulic connection, which is arranged on a second connection side.
The thus achievable connectability to further pump modules enables the pumping capacity to be increased. In particular, the achievable pressure can be multiplied by stacking a plurality of pump modules.
A wide range of applications can thus be covered by a small number of different pump modules which differ, for example, with respect to their flow rate. The storage expenditure within the trade chain can thereby be
considerably reduced .
In particular, an elongated pump device, which, for example, is ideally suited for use in a borehole, can be produced by the stackability of the pump modules.
For example, a certain flow rate can be obtained by the choice of the type of the pump modules, and the pressure that is required to convey the fluid, for example, out of a borehole can be achieved by the number of the pump modules.
A further favorable solution provides for the at least one pump module to comprise at least one pump element for creating a pressure difference between the fluid inlet and the fluid outlet. The pressure required for the particular purpose can thereby be generated, for example, in order to convey a fluid out of a borehole.
It is particularly favorable if the at least one pump module comprises at least two pump elements for creating a pressure difference between the fluid inlet and the fluid outlet. A pump module with a reduced starting torque can thereby be achieved.
A particularly favorable solution provides for the at least one pump module to comprise at least one drive. Owing to the at least one pump module having its own drive, the drive can be ideally attuned to the pump module, thereby making a more efficient construction achievable. Furthermore, the pump module can, as result, also be used singly. It is favorable if the at least one drive for driving the at least one pump element is coupled to the at least one pump element.
It is particularly advantageous if the drive comprises an external rotor motor, the external rotor of which is formed by the impeller. A space-saving direct coupling between drive and pump element is thereby achievable.
In a particularly favorable way, the fluid inlet and the fluid outlet of the at least one pump module are aligned in an axial direction. It is thus possible to stack the pump modules one on top of the other so as to produce a straight stack which can be used at an operational site with limited space such as, for example, a borehole.
A particularly favorable solution provides for the fluid inlet of the at least one pump module to comprise a first fluid connection which is arranged on the first connection side, and for the fluid outlet of the at least one pump module to comprise a second fluid connection which is arranged on the second
connection side.
It is favorable if the connection sides extend substantially parallel, so that a straight stack is possible.
Furthermore, it is advantageous if the first fluid connection and the second fluid connection of the at least one pump module are complementary in design. Owing to the first fluid connection and the second fluid connection being of complementary design, the second fluid connection can be connected to a first fluid connection of a further constructionally identical pump module. A stacked arrangement of the pump modules is enabled by the fluid
connections of two pump modules being connectable to each other.
A further advantageous solution provides for the at least one pump module to comprise a first and a second connection device for mechanical, hydraulic and electrical connection. The pump modules can thereby be mechanically, hydraulically and electrically connected to one another.
It is particularly advantageous if the at least one pump module comprises an electrical supply and transmission device which extends between the first connection side and the second connection side. The pump modules are supplied with (electrical) energy, which is required for conveying the fluid, by means of the electrical supply and transmission device.
The electrical supply and transmission device may also be used for
transmitting signals such as, for example, control commands to the drive or status information on temperature, pressure or rotational speed of the drive.
Installation space can be saved by joint use of the supply and transmission device for a plurality of pump modules. This is particularly advantageous in working environments with limited space such as, for example, in boreholes.
A particularly favorable connectability of the pump modules is achieved if the electrical supply and transmission device comprises a first electrical connection element which is arranged on the first connection side of the at least one pump module and a second electrical connection element which is arranged on the second connection side of the at least one pump module. The electrical connection between stacked pump modules is thereby enabled . It is particularly favorable for the connection of two pump modules if the first electrical connection element and the second electrical connection element are complementary in design. The second electrical connection of a pump module is thereby connectable to the first electrical connection of a further
constructionally identical pump module.
It is particularly favorable if the at least one pump module comprises at least one first mechanical connection element which is arranged on the first connection side and at least one second mechanical connection element which is arranged on the second connection side. The mechanical connection elements enable the mechanical connection between the pump modules and can absorb the forces that occur, so that any existing fluid connection or any existing electrical connection is relieved. Furthermore, it is advantageous if the at least one first mechanical connection element is complementary in design to the at least one second mechanical connection element. The at least one second mechanical connection element is thereby connectable to at least one first mechanical connection element of a further constructionally identical pump module.
A particularly advantageous solution provides for the pump device to comprise at least two pump modules which are fluidically connected in series.
A further particularly favorable solution provides for the at least two pump modules to be mechanically and hydraulically connected . A single group of components is thereby produced, which comprises the combined pumping capacities of the pump modules and, in addition, can be handled as a unit.
It is favorable if conveyed fluid flows through each pump module of the pump device. Advantageously, the at least two pump modules are electrically connected . For example, electrical energy or control signals can thus be passed on from pump module to pump module. It is particularly advantageous if the fluid outlet of a first pump module is fluidically connected to the fluid inlet of a second pump module.
A further advantageous solution provides for the pressure difference between the fluid inlet of a first pump module and the fluid outlet of a last pump module to correspond approximately to the sum of the pressure differences between the respective fluid inlet and the respective fluid outlet of the individually stacked pump modules. The pump pressure can thus be adapted to the requirements of the intended use by the number of pump modules used .
Furthermore, it is favorable if each pump module comprises a drive for driving the pump element of the pump module.
Advantageously, the pump modules can be combined by stacking in order to meet the hydraulic requirements.
It is favorable if a connection device is made available for connecting the modules hydraulically and electrically. Further features and advantages of the invention form the subject matter of the following description and drawings of embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:
Figure 1 shows a perspective representation of an embodiment of a pump device in accordance with the invention; Figure 2 shows a vertical section through the pump device from Figure 1 taken through the sectional line 2-2; Figure 3 shows a perspective exploded view of the embodiment of the pump device;
Figure 4 shows a side view of the embodiment of the pump device; Figure 5 shows a side view of the pump device from Figure 4, with the housings of the pump modules blanked out;
Figure 6 shows a side view of a second embodiment of the pump device with four pump modules;
Figure 7 shows a side view of the pump device from Figure 6, with the housings of the pump modules blanked out; and
Figure 8 shows a sectional representation of the second embodiment in accordance with Figure 6.
DETAILED DESCRIPTION OF THE INVENTION
Like or functionally equivalent elements are denoted by like reference numerals in all Figures.
A pump device 10, shown in its entirety in Figure 1, for conveying a fluid 11 comprises a suction cover 12, a plurality of, for example, two, pump modules 14 and a pipe connection 16.
The suction cover 12 has a cylindrical wall 18 which is covered on a suction side 20 of the suction cover 12 by a perforated wall 22. The perforated wall 22 has a plurality of openings 24 through which fluid can pass. The perforated wall 22 therefore creates a screening effect.
Located opposite the suction side 20 is a connection side 26 of the suction cover 12. In the region of the connection side 26, a plurality of, for example, three, mechanical connection elements 28 are arranged on the outer side of the cylindrical wall 18 of the suction cover 12.
The suction cover is held on a first connection side 30 of a pump module 14 by means of the mechanical connection elements 28.
The pump module 14 comprises a substantially cylindrical housing 34 with a cylindrical outer wall 31. The housing 34 comprises the first connection side 30 arranged at an end face and a second connection side 36 located opposite to and spaced in an axial direction 33 from the first connection side 30.
The first connection side 30 has a fluid inlet 38 arranged, for example, coaxially with the substantially cylindrical housing 34. For connection to other pump modules 14 or to the suction cover 12, the first connection side 30 has a first connection device 40, which comprises a first fluid connection 42, a plurality of, for example, three, first mechanical connection elements 44 and a first electrical connection element 46. The first fluid connection 42 is arranged at the fluid inlet 38, so that the fluid inlet 38 is connectable in a fluid-tight manner to a matching second fluid connection 58. A corresponding, matching second fluid connection 58 may be arranged, for example, on a pipe connection 16, on a hose or on a further pump module 14.
The first mechanical connection elements 44 are arranged on the first connection side 30 outside of the fluid inlet 38. The first mechanical
connection elements 44 are designed for a mechanical connection, for example, for a releasable mechanical connection. To this end, the first mechanical connection elements 44 may be of small plate-shaped
configuration with a bore. This makes it possible to make a screw connection. Further types of
connection are, however, also possible such as, for example, clamping, adhesive bonding, welding, riveting, latching or the like.
The first mechanical connection elements 44 are suitable for connection both to other pump modules 14 and to the suction cover 12.
The first electrical connection element 46 is arranged outside of the circular base area of the cylindrical housing 34. The first electrical connection element 46 has a crescent-shaped cross section 48, the inner boundary line 50 of which has a radius of curvature which corresponds to the radius of the cylindrical outer wall 31 of the housing 34, so that the first electrical connection element 46 can be placed on the cylindrical outer wall 31 of the housing 34. The first electrical connection element 46 has, for example, a female plug connection for connection of a plurality of electrical conductors of an electrical supply and transmission device 52.
The electrical supply and transmission device 52 extends from the first connection side 30 of the pump module 14 to the second connection side 36 of the pump module 14. At the second connection side 36, the electrical supply and transmission device 52 continues into a second electrical connection element 54. The second electrical connection element 54 is configured, for example, as a male plug for connection of a plurality of wires of the electrical supply and transmission device 52. Furthermore, the second electrical connection element 54 is complementary in design to the first electrical connection element 52, so that the first electrical connection element 52 is connectable to a second electrical connection element 54 of a further pump module 14.
Arranged on the second connection side 36 is a second connection device 56, which comprises the second electrical connection element 54, a second fluid connection 58 and a plurality of, for example, three, second mechanical connection elements 60.
The second fluid connection 58 is arranged at a fluid outlet 62 coaxially with the fluid inlet 38 and is designed for connection to a first fluid connection 42 of a further constructionally identical pump module 14.
The fluid outlet 62 can thus be connected in a fluid-tight manner to the fluid inlet 38 of a further pump module 14.
In order to achieve a straight arrangement of the pump modules 14, which saves as much space as possible, the fluid outlet 62 is arranged coaxially with the fluid inlet 38. The spacing between fluid inlet 38 and fluid outlet 62 defines a pumping direction 63.
The second mechanical connection elements 60 are complementary in design to the first mechanical connection elements 44. The second mechanical connection elements can thus be mechanically connected to first mechanical connection elements 44 of a further pump module 14.
To create a pressure difference between fluid inlet 38 and fluid outlet 62, the pump module 14 comprises a pump element 70, which is driven by a drive 72.
The drive 72 is, for example, an external rotor electric motor 74, on the external rotor of which the pump element 70 is arranged. The pump element 70 is thus driven directly by the motor 74 without any transmission losses occurring, for example, via a gearing.
The axis of rotation 78 of the motor 74 and therefore also of the pump element 70 is substantially coaxial with the cylinder axis of the housing 34. The diameter 80 of the external rotor 76 is smaller than an inner diameter 82 of the housing 34, and the depth of the external rotor 76 is less than the height of the housing 34, so that a free space 84 is formed within the housing 34 around the external rotor 76. The free space 84 is used as fluid passage 86 between the fluid inlet 38 and the fluid outlet 62.
The pump element 70 comprises vane elements 88, which extend from the external rotor 76 into the free space 84 without touching the housing 34. The fluid 11 located in the free space 84 is made to rotate together with the pump element 70 by the vane elements 88.
The fluid passage 86 comprises three regions, a radially extending pressure generation region 90, an axially extending transition region 92 and a radially extending return flow region 94.
The pressure generation region 90 extends from the fluid inlet between the first connection side 30 and the external rotor 76 radially outwardly. In this region, the fluid 11 is made to rotate by the vane elements 88 of the pump element 70.
The centrifugal forces occurring due to the rotation generate a radial pressure gradient in the fluid 11, with the pressure near the axis of rotation 78 being lower than at the cylindrical outer wall 31 of the housing 34.
The transition region 92 extends from the first connection side 30 in the axial direction 33 to the second connection side 36 between the cylindrical outer wall 31 of the housing 34 and the external rotor 76. In the transition region 92, curved vane elements 96 are arranged on the external rotor 76, which ensure that the fluid 11 is pushed by the rotation of the pump element 70 in the axial direction 33 to the second connection side 36.
Alternatively, straight vane elements 88 may be arranged on the external rotor 76 in the transition region 92, so that the pump element 70 is
independent of a direction of rotation 64.
The return flow region 94 extends between the second connection side 36 of the housing 34 and the external rotor 76 radially from the cylindrical outer wall 31 of the housing 34 to the fluid outlet 62. In the return flow region 94, static vane elements 89 are arranged on the housing 34, which extend into the return flow region 94, so that the rotation of the fluid 11 is braked . The rotation of the fluid in the return flow region 94 is at least lower than in the pressure generation region 90. Owing to the rotation of the fluid being reduced in the return flow region 94, the pressure gradient in the fluid along the return flow region 94 is lower than the pressure gradient in the pressure generation region 90. A pressure difference is thereby created between the fluid inlet and the fluid outlet. The first embodiment of the pump device 10 comprises two pump modules 14, which are mechanically, hydraulically and electrically connected to each other, the second connection device 56 of the first pump module 14 being connected to the first connection device 40 of the second pump module 14. The two pump modules 14 of the pump device 10 differ in that the two pump modules 14 have directions of rotation 64 which are opposite to each other. Accordingly, one of the pump modules 14 is, for example, a counterclockwise pump module 66, in which the pump element 70, seen in the pumping direction 63, rotates counterclockwise. The other pump module 14 is a clockwise pump module 68, in which the pump element 70 rotates clockwise.
With such an arrangement, the torques which occur when accelerating and braking the pump elements 70 of the pump modules 14 cancel each other out when the pump elements 70 are synchronously accelerated or braked . Optimum use may be made of the effect when the number of counterclockwise pump modules 66 is equal to the number of clockwise pump modules 68.
The suction cover 12 is arranged on the first connection device 40 of the first pump module 14 and held on the first mechanical connection elements, and a fluid-tight electrical end element 98 is connected to the first electrical connection element 46 of the first pump module 14.
A pipe connection 16 is connected to the second connection device 56 of the second pump module 14 and held on the second mechanical connection elements 60, and an electrical supply device 102 is connected to the second electrical connection element 54 of the second pump module 14.
With this arrangement, fluid 11 entering the pump device 10 through the suction cover 12 is conducted through the first pump module 14 along the fluid passage 86, as a result of which the pressure within the fluid 11 increases. The fluid 11 is then conducted through the fluid outlet 62 of the first pump module 14 into the fluid inlet 38 of the second pump module 14, and from there the fluid 11 passes through the fluid passage 86 of the second pump module 14, as a result of which the pressure within the fluid 11 increases further.
The pressure increase achieved can be adapted to different requirements by the number of pump modules 14 connected hydraulically in series within the pump device 10. For example, a pump device 10 with four pump modules 14 is possible, as shown in Figures 6 and 7.
A second embodiment, shown in Figure 8, of a pump device 10 differs from the first embodiment shown in Figures 1 to 7 in that the counter-rotation of two pump elements 70 is achieved by a first pump element 104 being driven by an inner shaft 106 and a second pump element 108 being driven by an outer hollow shaft 110. The inner shaft 106 is arranged coaxially with the outer hollow shaft 110 and extends within the outer hollow shaft 110. The inner shaft 106 extends from a first motor 112 to the first pump element 104.
The first motor drives the inner shaft 106 and by means of the latter the first pump element 104.
The outer hollow shaft 110 extends from the second pump element 108 to a second motor 114, and the second pump element 108 and the second motor 114 are arranged between the first pump element 104 and the first motor 112.
The second motor drives the outer hollow shaft 110 and by means of the latter the second pump element 108. The first pump element 104 and the second pump element 108 can, therefore, be driven independently of each other, whereby a counter-rotation of the pump elements 70 is achievable, which leads to a reduction in the starting torque. Aside from that, the second embodiment, shown in Figure 8, of the pump device 10 corresponds in terms of construction and operation to the first embodiment shown in Figures 1 to 7, to the above description of which reference is made for details thereof. List of Reference Numerals pump device
fluid
suction cover
pump module
pipe connection
cylindrical wall
suction side
perforated wall
openings
connection side of suction cover
mechanical connection element
first connection side
cylindrical outer wall
axial direction
housing
second connection side
fluid inlet
first connection device
first fluid connection
first mechanical connection element
first electrical connection element
crescent-shaped cross section
inner boundary line
electrical supply and transmission device second electrical connection element
second connection device
second fluid connection
second mechanical connection element fluid outlet
pumping direction direction of rotation
counterclockwise pump module clockwise pump module pump element
drive
motor
external rotor
axis of rotation
diameter of external rotor inner diameter of housing free space
fluid passage
vane element
static vane element
pressure generation region transition region
return flow region
curved vane element
fluid-tight electrical end element electrical supply device first pump element
inner shaft
second pump element outer hollow shaft
first motor
second motor

Claims

Claims
1. Pump device for conveying a fluid (11), comprising a plurality of pump elements (70), which are each mounted for rotation about an axis of rotation (78), and which create a pressure difference by rotation about the axis of rotation (78),
c h a r a c t e r i z e d i n t h a t at least one of the pump elements (70) has a direction of rotation (64) which is opposite to the direction of rotation (64) of at least one other pump element (70) of the pump device (10).
2. Pump device in accordance with claim 1, characterized in that the axes of rotation (78) of the pump elements (70) of the pump device (10) extend substantially parallel to one another.
3. Pump device in accordance with claim 1 or 2, characterized in that the pump elements (70) rotate coaxially with one another.
4. Pump device in accordance with any one of claims 1 to 3, characterized in that the axes of rotation (78) of the pump elements (70) of the pump device (10) extend substantially parallel to a pumping direction (63) of the pump device (10).
5. Pump device in accordance with any one of claims 1 to 4, characterized in that the pump device (10) has an even number of pump elements (70).
6. Pump device in accordance with any one of claims 1 to 5, characterized in that the pump elements (70) have in pairs opposite directions of rotation (64).
7. Pump device in accordance with claim 6, characterized in that the pump elements (70) of one half of the pump elements (70), seen in a pumping direction (63), rotate clockwise, and the pump elements (70) of the other half of the pump elements (70), seen in a pumping direction (63), rotate counterclockwise.
8. Pump device in accordance with any one of claims 1 to 7, characterized in that pump elements (70) are flow pump elements.
9. Pump device in accordance with any one of claims 1 to 8, characterized in that the pump device (10) comprises at least one pump module (14) having a housing (34), a fluid outlet (62) and a fluid inlet (38), the at least one pump module (14) comprising a first connection device (40) for mechanical and hydraulic connection, which is arranged on a first connection side (30), and a second connection device (56) for
mechanical and hydraulic connection, which is arranged on a second connection side (36).
10. Pump device in accordance with claim 9, characterized in that the at least one pump module (14) comprises at least one pump element (70) for creating a pressure difference between the fluid inlet (38) and the fluid outlet (62).
11. Pump device in accordance with claim 9 or 10, characterized in that the at least one pump module (14) comprises at least one drive (72).
12. Pump device in accordance with any one of claims 9 to 11, characterized in that the fluid inlet (38) and the fluid outlet (62) of the at least one pump module (14) are aligned in an axial direction (33).
13. Pump device in accordance with any one of claims 9 to 12, characterized in that the fluid inlet (38) of the at least one pump module (14) comprises a first fluid connection (42) which is arranged on the first connection side (30), and in that the fluid outlet (62) of the at least one pump module (14) comprises a second fluid connection (58) which is arranged on the second connection side (36).
14. Pump device in accordance with claim 13, characterized in that the first fluid connection (42) and the second fluid connection (58) of the at least one pump module (14) are complementary in design.
15. Pump device in accordance with any one of claims 9 to 14, characterized in that the at least one pump module (14) comprises an electrical supply and transmission device (52) which extends between the first connection side (30) and the second connection side (36) of the at least one pump module (14).
16. Pump device in accordance with claim 15, characterized in that the
electrical supply and transmission device (52) comprises a first electrical connection element (46) which is arranged on the first connection side (30) of the at least one pump module (14) and a second electrical connection element (54) which is arranged on the second connection side (36) of the at least one pump module (14).
17. Pump device in accordance with claim 16, characterized in that the first electrical connection element (46) and the second electrical connection element (54) are complementary in design.
18. Pump device in accordance with any one of claims 9 to 17, characterized in that the at least one pump module (14) comprises at least one first mechanical connection element (44) which is arranged on the first connection side (30) and at least one second mechanical connection element (60) which is arranged on the second connection side (36).
19. Pump device in accordance with claim 18, characterized in that the at least one first mechanical connection element (44) is complementary in design to the at least one second mechanical connection element (60).
20. Pump device in accordance with any one of claims 9 to 19, characterized in that the pump device (10) comprises at least two pump modules (14) which are fluidically connected in series.
21. Pump device in accordance with claim 20, characterized in that the at least two pump modules (14) are mechanically and hydraulically connected .
22. Pump device in accordance with claim 20 or 21, characterized in that the at least two pump modules (14) are electrically connected.
23. Pump device in accordance with any one of claims 20 to 22,
characterized in that the fluid outlet (62) of a first pump module (14) is fluidically connected to the fluid inlet (38) of a second pump module (14).
24. Pump device in accordance with any one of claims 20 to 23,
characterized in that the pressure difference between the fluid inlet (38) of a first pump module (14) and the fluid outlet (62) of a last pump module (14) corresponds approximately to the sum of the pressure differences between the respective fluid inlet (38) and the respective fluid outlet (62) of the individually stacked pump modules (14).
PCT/EP2013/058706 2012-05-18 2013-04-26 Pump device WO2013171053A1 (en)

Applications Claiming Priority (2)

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DE102012104311A DE102012104311A1 (en) 2012-05-18 2012-05-18 Starting torque reduction for pumping devices
DE102012104311.6 2012-05-18

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CN109863308A (en) * 2016-08-10 2019-06-07 可克斯塔特国际股份有限公司 Modular multistage pump assembly
WO2020037106A1 (en) * 2018-08-16 2020-02-20 Saudi Arabian Oil Company Motorized pump
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US10941778B2 (en) 2018-08-16 2021-03-09 Saudi Arabian Oil Company Motorized pump
US11371326B2 (en) 2020-06-01 2022-06-28 Saudi Arabian Oil Company Downhole pump with switched reluctance motor
US11499563B2 (en) 2020-08-24 2022-11-15 Saudi Arabian Oil Company Self-balancing thrust disk
US11591899B2 (en) 2021-04-05 2023-02-28 Saudi Arabian Oil Company Wellbore density meter using a rotor and diffuser
US11644351B2 (en) 2021-03-19 2023-05-09 Saudi Arabian Oil Company Multiphase flow and salinity meter with dual opposite handed helical resonators
US11913464B2 (en) 2021-04-15 2024-02-27 Saudi Arabian Oil Company Lubricating an electric submersible pump
US11920469B2 (en) 2020-09-08 2024-03-05 Saudi Arabian Oil Company Determining fluid parameters

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CN109642558A (en) * 2016-06-22 2019-04-16 木质部知识产权管理有限责任公司 Pumping unit
CN109863308A (en) * 2016-08-10 2019-06-07 可克斯塔特国际股份有限公司 Modular multistage pump assembly
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US11920469B2 (en) 2020-09-08 2024-03-05 Saudi Arabian Oil Company Determining fluid parameters
US11644351B2 (en) 2021-03-19 2023-05-09 Saudi Arabian Oil Company Multiphase flow and salinity meter with dual opposite handed helical resonators
US11591899B2 (en) 2021-04-05 2023-02-28 Saudi Arabian Oil Company Wellbore density meter using a rotor and diffuser
US11913464B2 (en) 2021-04-15 2024-02-27 Saudi Arabian Oil Company Lubricating an electric submersible pump

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