US20080118375A1 - Axially Driven Piston-Cylinder Unit - Google Patents
Axially Driven Piston-Cylinder Unit Download PDFInfo
- Publication number
- US20080118375A1 US20080118375A1 US11/795,093 US79509306A US2008118375A1 US 20080118375 A1 US20080118375 A1 US 20080118375A1 US 79509306 A US79509306 A US 79509306A US 2008118375 A1 US2008118375 A1 US 2008118375A1
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- US
- United States
- Prior art keywords
- piston
- piston rod
- drive element
- cylinder
- drive
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
- F02G1/0435—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines the engine being of the free piston type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
- F04B35/045—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric using solenoids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
- F04B39/0022—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons piston rods
Definitions
- the invention relates to an axially-driven piston-cylinder unit.
- a piston-cylinder unit is known, for example, from U.S. Pat. No. 5,525,845.
- the piston rod is rigidly joined, both to the axially-movable drive element of the linear drive and also to the piston.
- the piston which is driven by the linear motor, a state can arise in which the axial oscillation of the unit comprising the movable drive element, piston rod and piston, experiences an increase in the amplitude of the oscillations, so that the piston head of the piston can strike against the top of the cylinder bore. This can result in damage to the piston head or the top end face wall of the cylinder bore.
- the object of the present invention is to design a generic axially-driven piston-cylinder unit in such a way that the danger of damage to the piston or the cylinder is reduced.
- the piston rod In normal operation of the piston-cylinder unit, the piston rod is exactly located, both on the piston and on the drive element, and no relative movement occurs between the drive element, piston rod and piston. Only in the case of an overload, when the force applied by the drive element exceeds the pretensioning force of the elastic device does a relative movement occur between the drive element and the piston rod or between the piston rod and the piston.
- the drive element By the decoupling of the mass of the drive element from the piston, by means of the elastic device, the drive element is braked by the elastic device if the piston lands on the top end face wall of the cylinder bore during a movement of the piston into the compression position.
- the mass of the piston possibly including the mass of the piston rod but not including the mass of the drive element, will strike the top end face wall of the cylinder bore.
- the shock pulse which arises from this is significantly less, compared to a rigid unit comprising the piston, piston rod and drive element, so that the danger of damage to the piston head or the top end face wall of the cylinder bore, is also greatly reduced.
- the piston head is provided with an opening through which the first end of the piston rod is passed, such that the piston rod can move relative to the piston in the axial direction of the piston, where the elastic device is provided between the piston rod and the piston and whereby the elastic device pretensions the piston rod from the piston towards the driver device, where the piston rod is provided with an end-stop which prevents the piston rod from coming out of the opening.
- Another advantageous form of embodiment is distinguished by the fact that the drive element is provided with an opening through which the second end of the piston rod is passed, that the piston rod can move relative to the drive element, in the axial direction of the drive element, that the elastic device is provided between the piston rod and the drive element and that the elastic device pre-tensions the piston rod from the drive element towards the piston, where the piston rod is provided with an end-stop which prevents the piston rod from coming out of the opening.
- the decoupling is effected by means of the elastic device on the drive element side, so that a fixed joint can be provided between the piston and the piston rod and it is not necessary to provide an expensive seal on an opening in the piston head.
- the elastic device will have a spring or will be made of a spring.
- Particularly preferred here is the provision of a disk-spring arrangement or a spiral spring under compression or tension.
- a realization of the present invention is especially effective in the case of a linear drive, for example a linear motor, where the piston is subject to the back and forward drive of a movable drive element of the linear drive.
- a preferred application of the axially driven piston-cylinder unit in accordance with the invention is its use in a compressor for producing a pressurized fluid.
- FIG. 1 shows a first form of embodiment of the invention with a decoupling mechanism in the region of the piston
- FIG. 2 shows an enlarged diagram of the passage of the piston rod through the piston head, in the form of embodiment shown in FIG. 1 .
- FIG. 1 shows a longitudinal section through a piston-cylinder unit 1 with a cylinder 2 and a piston 3 .
- the cylinder 2 has a cylinder bore 10 , in which the piston 3 is accommodated so that it is freely guided and can move back and forth along the direction of the longitudinal axis X of the cylinder bore 10 .
- the piston 3 has a gas bearing in the cylinder 2 .
- the top end face wall 12 of the cylinder bore 10 formed in a cylinder head 23 , the internal circumferential wall 14 of the cylinder bore 10 and the piston head 16 delimit the cylinder chamber 18 .
- An inlet manifold 22 with a valve 20 which is shown schematically, opens out into the top end face wall 12 of the cylinder bore 10 .
- an exhaust manifold 24 which has a corresponding valve 26 ; this exhaust manifold also opens out into the cylinder bore 10 .
- the piston-cylinder unit 1 shown is part of a piston-drive machine in which the expelled fluid is in gaseous form, such as is the case for a compressor, for example.
- the invention can in principle also be used with other piston-drive machines, such as for example pumps.
- the piston 3 is driven by a drive element 50 , of a linear drive 5 shown only schematically in the figure, which can execute oscillatory longitudinal movements back and forth along an axis Y.
- the movable drive element 50 is joined mechanically to the piston 3 by a piston rod 4 .
- the piston rod 4 is inelastic in the axial direction, and is thus capable of transmitting axial forces from the drive element 50 to the piston 3 .
- the piston rod 4 is rigidly joined to the drive element 50 .
- the piston rod 4 is guided in the piston 3 so as to be movable in the direction of the longitudinal axis X of the cylinder 2 , or of the longitudinal axis X′ of the piston 3 , which is coaxial with the former.
- the piston rod 4 has a bearing in an annular radial support 31 in the inside of the piston 3 , where there is a fixed joint between the piston 3 and the radially outermost perimeter of the radial support 31 , which has a central opening through which the piston rod 4 is guided so that it is movable.
- a central through-hole 16 ′ is provided in the piston head 16 , ( FIG. 2 ), through which the first end 4 ′ of the piston rod 4 , at the piston end, is passed in such a way that it can move axially.
- the face of the first end 4 ′ of the piston rod 4 , at the piston end, is provided with a mushroom-shaped head 41 , the domed surface of which faces towards the cylinder head 23 .
- the mushroom-shaped head 41 forms an annular landing area 41 ′, the outer diameter of which is greater than the diameter of the opening 16 ′ in the piston head 16 so that the piston rod 4 is secured against slipping out, towards the left in the figures.
- the first end 4 ′ of the piston rod 4 at the piston end, has a reduced diameter compared with the rest of the piston rod 4 .
- a seal 43 which seals the first end section 4 ′ of the piston rod 4 , at the piston end, against the inner circumference 16 ′ of the piston head 16 .
- an elastic device 6 is provided in the form of a domed annular disk-spring 44 with its outer perimeter fixed to the piston 3 and having a central hole through which the piston rod 4 is passed, where the inner circumference of the annular disk-spring 44 is fixed to the piston rod 4 .
- the dome of the disk-spring 44 is convex towards the left, that is towards the drive element 50 , so that the disk-spring 44 applies a pretension to the piston rod 4 , towards the left in FIG. 1 , as a result of which the annular surface 41 ′ of the mushroom-shaped head 41 on the first end 4 ′ of the piston rod 4 , at the piston end, is brought into contact with the piston head 16 under the tension from the spring 44 .
- the piston head 16 moves to land on the top end face wall 12 of the cylinder head 23 . Due to the mass inertia of the movable drive element 50 and piston rod 4 , the drive element 50 and piston rod 4 continue their movement towards the right, against the force of the disk-spring 44 , and are braked by the spring force of the disk-spring 44 . When this happens, the mushroom-shaped head 41 on the end 4 ′ of the piston rod 4 , at the piston end, lifts off from the piston head 16 and moves into a recess 25 which is formed in the cylinder head 23 in the region where the exhaust manifold 24 opens out into the cylinder chamber 18 .
- the piston rod 4 can also have a fixed joint to the piston 3 , with an axially movable bearing for the piston rod 4 being provided in the drive element 50 , and the elastic element formed by the spring 44 being provided between the piston rod 4 and the drive element 50 .
- the invention is not restricted to the above exemplary embodiment, which is only for the purpose of explaining in general the core idea of the invention. Rather the device in accordance with the invention can, within the scope of the protection, assume other forms of embodiment than that described above. In this case the device can, in particular, have characteristics which represent a combination of the relevant individual characteristics of the claims.
Abstract
An axially driven piston-cylinder unit comprising a cylinder, a piston that can be moved back and forth in the axial direction of the cylinder, between first and second piston positions, and a drive element that can be moved back and forth in the axial direction of the cylinder and is mechanically connected to the piston by means of a piston rod. The piston rod is connected to the piston or the drive element against the pretension of an elastic device, in such a way that it can be moved axially in relation to the piston or the drive element, such that when the piston head comes into contact with the front wall of the cylinder borehole, on the side of the cylinder head, the other movement of the drive element is performed against the force of the elastic device, thus braking the drive element.
Description
- The invention relates to an axially-driven piston-cylinder unit.
- A piston-cylinder unit is known, for example, from U.S. Pat. No. 5,525,845. In that, the piston rod is rigidly joined, both to the axially-movable drive element of the linear drive and also to the piston. During operation of the piston, which is driven by the linear motor, a state can arise in which the axial oscillation of the unit comprising the movable drive element, piston rod and piston, experiences an increase in the amplitude of the oscillations, so that the piston head of the piston can strike against the top of the cylinder bore. This can result in damage to the piston head or the top end face wall of the cylinder bore.
- The object of the present invention is to design a generic axially-driven piston-cylinder unit in such a way that the danger of damage to the piston or the cylinder is reduced.
- This object is achieved by the features specified in the claims.
- In normal operation of the piston-cylinder unit, the piston rod is exactly located, both on the piston and on the drive element, and no relative movement occurs between the drive element, piston rod and piston. Only in the case of an overload, when the force applied by the drive element exceeds the pretensioning force of the elastic device does a relative movement occur between the drive element and the piston rod or between the piston rod and the piston.
- By the decoupling of the mass of the drive element from the piston, by means of the elastic device, the drive element is braked by the elastic device if the piston lands on the top end face wall of the cylinder bore during a movement of the piston into the compression position. By this means, only the mass of the piston, possibly including the mass of the piston rod but not including the mass of the drive element, will strike the top end face wall of the cylinder bore. The shock pulse which arises from this is significantly less, compared to a rigid unit comprising the piston, piston rod and drive element, so that the danger of damage to the piston head or the top end face wall of the cylinder bore, is also greatly reduced.
- In an advantageous embodiment, the piston head is provided with an opening through which the first end of the piston rod is passed, such that the piston rod can move relative to the piston in the axial direction of the piston, where the elastic device is provided between the piston rod and the piston and whereby the elastic device pretensions the piston rod from the piston towards the driver device, where the piston rod is provided with an end-stop which prevents the piston rod from coming out of the opening. With this form of embodiment, the mass striking against the top end face wall is yet further reduced, because the mass of the piston rod is also decoupled from the piston.
- It is particularly advantageous here if the passage of the piston rod through the opening is sealed, for which purpose a seal which encircles the piston rod is preferably provided. With this form of embodiment, the compression efficiency is improved, because the medium which is compressed by the piston cannot leak through the annular gap around the piston rod.
- Another advantageous form of embodiment is distinguished by the fact that the drive element is provided with an opening through which the second end of the piston rod is passed, that the piston rod can move relative to the drive element, in the axial direction of the drive element, that the elastic device is provided between the piston rod and the drive element and that the elastic device pre-tensions the piston rod from the drive element towards the piston, where the piston rod is provided with an end-stop which prevents the piston rod from coming out of the opening. With this variant, the decoupling is effected by means of the elastic device on the drive element side, so that a fixed joint can be provided between the piston and the piston rod and it is not necessary to provide an expensive seal on an opening in the piston head.
- Preferably, the elastic device will have a spring or will be made of a spring. Particularly preferred here is the provision of a disk-spring arrangement or a spiral spring under compression or tension.
- A realization of the present invention is especially effective in the case of a linear drive, for example a linear motor, where the piston is subject to the back and forward drive of a movable drive element of the linear drive.
- A preferred application of the axially driven piston-cylinder unit in accordance with the invention is its use in a compressor for producing a pressurized fluid.
- The invention is explained in more detail below using an example, with reference to the drawing. In this
-
FIG. 1 shows a first form of embodiment of the invention with a decoupling mechanism in the region of the piston, and -
FIG. 2 shows an enlarged diagram of the passage of the piston rod through the piston head, in the form of embodiment shown inFIG. 1 . -
FIG. 1 shows a longitudinal section through a piston-cylinder unit 1 with acylinder 2 and apiston 3. Thecylinder 2 has acylinder bore 10, in which thepiston 3 is accommodated so that it is freely guided and can move back and forth along the direction of the longitudinal axis X of thecylinder bore 10. Thepiston 3 has a gas bearing in thecylinder 2. The topend face wall 12 of thecylinder bore 10, formed in acylinder head 23, the internalcircumferential wall 14 of thecylinder bore 10 and thepiston head 16 delimit thecylinder chamber 18. - An
inlet manifold 22 with avalve 20, which is shown schematically, opens out into the topend face wall 12 of thecylinder bore 10. Also provided in the topend face wall 12 is anexhaust manifold 24, which has acorresponding valve 26; this exhaust manifold also opens out into thecylinder bore 10. - When the
piston 3 makes a movement to the left inFIG. 1 , fluid is drawn into thecylinder space 18 through theinlet manifold 22 and theinlet valve 20, and when thepiston 3 makes a movement to the right this fluid is expelled in a compressed state through theexhaust valve 26 and theexhaust manifold 24. The piston-cylinder unit 1 shown is part of a piston-drive machine in which the expelled fluid is in gaseous form, such as is the case for a compressor, for example. However, the invention can in principle also be used with other piston-drive machines, such as for example pumps. - The
piston 3 is driven by adrive element 50, of alinear drive 5 shown only schematically in the figure, which can execute oscillatory longitudinal movements back and forth along an axis Y. Themovable drive element 50 is joined mechanically to thepiston 3 by apiston rod 4. Thepiston rod 4 is inelastic in the axial direction, and is thus capable of transmitting axial forces from thedrive element 50 to thepiston 3. - The
piston rod 4 is rigidly joined to thedrive element 50. Thepiston rod 4 is guided in thepiston 3 so as to be movable in the direction of the longitudinal axis X of thecylinder 2, or of the longitudinal axis X′ of thepiston 3, which is coaxial with the former. For this purpose, thepiston rod 4 has a bearing in an annularradial support 31 in the inside of thepiston 3, where there is a fixed joint between thepiston 3 and the radially outermost perimeter of theradial support 31, which has a central opening through which thepiston rod 4 is guided so that it is movable. - A central through-
hole 16′ is provided in thepiston head 16, (FIG. 2 ), through which thefirst end 4′ of thepiston rod 4, at the piston end, is passed in such a way that it can move axially. The face of thefirst end 4′ of thepiston rod 4, at the piston end, is provided with a mushroom-shaped head 41, the domed surface of which faces towards thecylinder head 23. On the side which faces backwards towards thepiston head 16, the mushroom-shaped head 41 forms anannular landing area 41′, the outer diameter of which is greater than the diameter of theopening 16′ in thepiston head 16 so that thepiston rod 4 is secured against slipping out, towards the left in the figures. - The
first end 4′ of thepiston rod 4, at the piston end, has a reduced diameter compared with the rest of thepiston rod 4. Around this diameter can be arranged aseal 43 which seals thefirst end section 4′ of thepiston rod 4, at the piston end, against theinner circumference 16′ of thepiston head 16. - In the inside of the
piston 3, in the region of the radial position support 31, anelastic device 6 is provided in the form of a domed annular disk-spring 44 with its outer perimeter fixed to thepiston 3 and having a central hole through which thepiston rod 4 is passed, where the inner circumference of the annular disk-spring 44 is fixed to thepiston rod 4. InFIG. 1 , the dome of the disk-spring 44 is convex towards the left, that is towards thedrive element 50, so that the disk-spring 44 applies a pretension to thepiston rod 4, towards the left inFIG. 1 , as a result of which theannular surface 41′ of the mushroom-shaped head 41 on thefirst end 4′ of thepiston rod 4, at the piston end, is brought into contact with thepiston head 16 under the tension from thespring 44. - If the
piston 3 is moved to the right in the figure, that is into the compression position in which the enclosedcylinder chamber 18 is minimal, then thepiston head 16 moves to land on the topend face wall 12 of thecylinder head 23. Due to the mass inertia of themovable drive element 50 andpiston rod 4, thedrive element 50 andpiston rod 4 continue their movement towards the right, against the force of the disk-spring 44, and are braked by the spring force of the disk-spring 44. When this happens, the mushroom-shaped head 41 on theend 4′ of thepiston rod 4, at the piston end, lifts off from thepiston head 16 and moves into arecess 25 which is formed in thecylinder head 23 in the region where theexhaust manifold 24 opens out into thecylinder chamber 18. In this way, the impact when thepiston head 16 meets the topend face wall 12 is limited to the mass of thepiston 3, while the masses of thedrive element 50 and thepiston rod 4 are braked by thespring 44, at a point in time after thepiston head 16 hits the topend face wall 12. - Alternatively, the
piston rod 4 can also have a fixed joint to thepiston 3, with an axially movable bearing for thepiston rod 4 being provided in thedrive element 50, and the elastic element formed by thespring 44 being provided between thepiston rod 4 and thedrive element 50. - The invention is not restricted to the above exemplary embodiment, which is only for the purpose of explaining in general the core idea of the invention. Rather the device in accordance with the invention can, within the scope of the protection, assume other forms of embodiment than that described above. In this case the device can, in particular, have characteristics which represent a combination of the relevant individual characteristics of the claims.
- The sole purpose of reference marks in the claims, in the description and in the drawings is to aid understanding of the invention, and they should not restrict the scope of the protection.
Claims (15)
1-7. (canceled)
8. An axially driven piston-cylinder unit comprising:
a cylinder having a cylinder bore with a top end face wall;
a piston having a piston head and being movable back and forth along an axial direction of the cylinder between a first piston position, in which a cylinder chamber enclosed between the piston and the cylinder is largest, and a second piston position, in which the cylinder chamber is smallest;
a drive element being movable back and forth along the axial direction of the cylinder; and
a piston rod mechanically coupling the drive element and the piston and including a first end coupled to the piston and a second end coupled to the drive element; and
an elastic device coupling the piston rod to at least one of the piston and the drive element with the piston rod being movable axially relative to at least one of the piston and the drive element respectively against a pretensioning force of the elastic device such that, when the piston moves into the second piston position at the top end face wall, the piston head lands on the top end face wall of the cylinder bore, then the further movement of the drive element is made against the force of the elastic device, and thus the drive element is braked.
9. The axially driven piston-cylinder unit as claimed in claim 8 , further comprising:
an opening provided in the piston head and the first end of the piston rod extending through the opening;
the piston rod being movable in relation to the piston in the axial direction of the piston;
the elastic device coupling the piston rod and the piston; and
the elastic device pretensioning the piston rod from the piston towards the drive device, the piston rod including a piston end-stop restricting the piston rod from coming out of the opening.
10. The axially driven piston-cylinder unit as claimed in claim 9 , wherein the piston rod has a sealed passage into the piston opening and a seal surrounding the piston rod.
11. The axially driven piston-cylinder unit as claimed in claim 9 , wherein the elastic device includes an annular spring disk.
12. The axially driven piston-cylinder unit as claimed in claim 8 , further comprising:
an opening provided in the drive element and the second end of the piston rod extends through the opening;
the piston rod being movable in relation to the drive element in the axial direction of the drive element;
the drive elastic device coupling the piston rod and the drive element; and
the drive elastic device pretensioning the piston rod from the drive element towards the piston, the piston rod including a drive end-stop restricing the piston rod from coming out of the drive opening.
13. The axially driven piston-cylinder unit as claimed in claim 12 , wherein the elastic device includes a spring.
14. The axially driven piston-cylinder unit as claimed in claim 8 , wherein the piston is subject to the back and forth drive from a movable drive element of a linear drive.
15. A compressor for producing a pressurized fluid comprising:
at least one axially driven piston-cylinder unit comprising:
a cylinder having a cylinder bore with a top end face wall;
a piston having a piston head and movable back and forth along an axial direction of the cylinder between a first piston position, in which a cylinder chamber enclosed between the piston and the cylinder is largest, and a second piston position, in which the cylinder chamber is smallest;
a drive element being movable back and forth along the axial direction of the cylinder; and
a piston rod mechanically coupling the drive element and the piston and including a first end coupled to the piston and a second end coupled to the drive element; and
an elastic device coupling the piston rod to at least one of the piston and the drive element with the piston rod being movable axially relative to at least one of the piston and the drive element respectively against a pretensioning force of the elastic device such that, when the piston moves into the second piston position at the top end face wall, the piston head lands on the top end face wall of the cylinder bore, then the further movement of the drive element is made against the force of the elastic device, and thus the drive element is braked.
16. The compressor as claimed in claim 15 , further comprising:
an opening provided in the piston head and the first end of the piston rod extending through the opening;
the piston rod being movable in relation to the piston in the axial direction of the piston;
the elastic device coupling the piston rod and the piston; and
the elastic device pretensioning the piston rod from the piston towards the drive device, the piston rod including a piston end-stop restricting the piston rod from coming out of the opening.
17. The compressor as claimed in claim 16 , wherein the piston rod has a sealed passage into the piston opening and a seal surrounding the piston rod.
18. The compressor as claimed in claim 16 , wherein the elastic device includes an annular spring disk.
19. The compressor as claimed in claim 15 , further comprising:
an opening provided in the drive element and the second end of the piston rod extends through the opening;
the piston rod being movable in relation to the drive element in the axial direction of the drive element;
the drive elastic device coupling the piston rod and the drive element; and
the drive elastic device pretensioning the piston rod from the drive element towards the piston, the piston rod including a drive end-stop restricing the piston rod from coming out of the drive opening.
20. The compressor as claimed in claim 19 , wherein the elastic device includes a spring.
21. The compressor as claimed in claim 15 , wherein the piston is subject to the back and forth drive from a movable drive element of a linear drive.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005001470A DE102005001470B3 (en) | 2005-01-12 | 2005-01-12 | Axially driven piston-cylinder unit |
DE102005001470.4 | 2005-01-12 | ||
PCT/EP2006/000191 WO2006074915A1 (en) | 2005-01-12 | 2006-01-11 | Axially driven piston-cylinder unit |
Publications (1)
Publication Number | Publication Date |
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US20080118375A1 true US20080118375A1 (en) | 2008-05-22 |
Family
ID=35999600
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/795,093 Abandoned US20080118375A1 (en) | 2005-01-12 | 2006-01-11 | Axially Driven Piston-Cylinder Unit |
Country Status (8)
Country | Link |
---|---|
US (1) | US20080118375A1 (en) |
EP (1) | EP1838963B1 (en) |
JP (1) | JP2008527271A (en) |
KR (1) | KR20070106998A (en) |
CN (1) | CN101103199B (en) |
DE (1) | DE102005001470B3 (en) |
RU (1) | RU2371609C2 (en) |
WO (1) | WO2006074915A1 (en) |
Cited By (13)
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US20080019852A1 (en) * | 2004-12-23 | 2008-01-24 | Jan Brand | Linear Compressor |
US20120177513A1 (en) * | 2009-07-08 | 2012-07-12 | Whirlppol S.A. | Linear compressor |
US20130195686A1 (en) * | 2012-02-01 | 2013-08-01 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Variable displacement swash plate type compressor |
US20150078925A1 (en) * | 2013-09-16 | 2015-03-19 | Lg Electronics Inc. | Reciprocating compressor |
US20150285235A1 (en) * | 2012-08-24 | 2015-10-08 | Lg Electronics Inc. | Reciprocating compressor |
US20150377531A1 (en) * | 2014-06-26 | 2015-12-31 | Lg Electronics Inc. | Linear compressor and refrigerator including a linear compressor |
CN109209827A (en) * | 2018-10-22 | 2019-01-15 | 安徽寅时压缩机制造有限公司 | A kind of extrusion piston applied to conchoid compressor |
CN109469627A (en) * | 2019-01-07 | 2019-03-15 | 苏州经贸职业技术学院 | A kind of centrifugal pump Portable air extraction device and centrifugal pumping apparatus |
US10288063B2 (en) * | 2013-02-07 | 2019-05-14 | Whirlpool S.A. | Flow restrictor and gas compressor |
RU2694104C1 (en) * | 2018-09-07 | 2019-07-09 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный технический университет" | Piston-type compressor |
US20210123424A1 (en) * | 2019-10-24 | 2021-04-29 | Lg Electronics Inc. | Linear compressor |
US20220195959A1 (en) * | 2019-05-21 | 2022-06-23 | General Electric Company | Engine apparatus and method for operation |
US20230243345A1 (en) * | 2020-12-30 | 2023-08-03 | Lg Electronics Inc. | Linear compressor |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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BRPI1105480A2 (en) * | 2011-11-16 | 2016-01-19 | Whirlpool Sa | flow restrictor and gas compressor |
CN111622922B (en) * | 2019-02-28 | 2021-05-25 | 青岛海尔智能技术研发有限公司 | Double-cylinder linear compressor and refrigeration equipment |
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- 2006-01-11 CN CN2006800021622A patent/CN101103199B/en not_active Expired - Fee Related
- 2006-01-11 RU RU2007124544/06A patent/RU2371609C2/en not_active IP Right Cessation
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Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080019852A1 (en) * | 2004-12-23 | 2008-01-24 | Jan Brand | Linear Compressor |
US20120177513A1 (en) * | 2009-07-08 | 2012-07-12 | Whirlppol S.A. | Linear compressor |
US8998589B2 (en) * | 2009-07-08 | 2015-04-07 | Whirlpool S.A. | Linear compressor |
US10221842B2 (en) | 2009-07-08 | 2019-03-05 | Whirlpool S.A. | Linear compressor |
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US20150078925A1 (en) * | 2013-09-16 | 2015-03-19 | Lg Electronics Inc. | Reciprocating compressor |
US10837434B2 (en) * | 2013-09-16 | 2020-11-17 | Lg Electronics Inc. | Reciprocating compressor having a gas bearing |
US20150377531A1 (en) * | 2014-06-26 | 2015-12-31 | Lg Electronics Inc. | Linear compressor and refrigerator including a linear compressor |
RU2694104C1 (en) * | 2018-09-07 | 2019-07-09 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный технический университет" | Piston-type compressor |
CN109209827A (en) * | 2018-10-22 | 2019-01-15 | 安徽寅时压缩机制造有限公司 | A kind of extrusion piston applied to conchoid compressor |
CN109469627A (en) * | 2019-01-07 | 2019-03-15 | 苏州经贸职业技术学院 | A kind of centrifugal pump Portable air extraction device and centrifugal pumping apparatus |
US20220195959A1 (en) * | 2019-05-21 | 2022-06-23 | General Electric Company | Engine apparatus and method for operation |
US20210123424A1 (en) * | 2019-10-24 | 2021-04-29 | Lg Electronics Inc. | Linear compressor |
US11965500B2 (en) * | 2019-10-24 | 2024-04-23 | Lg Electronics Inc. | Linear compressor |
US20230243345A1 (en) * | 2020-12-30 | 2023-08-03 | Lg Electronics Inc. | Linear compressor |
Also Published As
Publication number | Publication date |
---|---|
CN101103199B (en) | 2011-03-23 |
CN101103199A (en) | 2008-01-09 |
DE102005001470B3 (en) | 2006-07-20 |
EP1838963B1 (en) | 2015-07-08 |
WO2006074915A1 (en) | 2006-07-20 |
JP2008527271A (en) | 2008-07-24 |
EP1838963A1 (en) | 2007-10-03 |
KR20070106998A (en) | 2007-11-06 |
RU2007124544A (en) | 2009-02-20 |
RU2371609C2 (en) | 2009-10-27 |
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