CN103161735A

CN103161735A - Wet rotor pump with pre-chamber

Info

Publication number: CN103161735A
Application number: CN2012105445322A
Authority: CN
Inventors: G·施特雷洛; T·马特尔内; B·屈斯特
Original assignee: Wilo SE
Current assignee: Wilo SE
Priority date: 2011-12-15
Filing date: 2012-12-14
Publication date: 2013-06-19
Anticipated expiration: 2032-12-14
Also published as: EP2604860B1; DE102011121149A1; EP2604860A1; CN103161735B

Abstract

The invention relates to a wet rotor pump, which comprises a stator (3) and rotors (5, 6) separated by a sealed pipe (2). The rotor comprises a rotor shaft (5) and a rotor combination (6), wherein the rotor is supported in a rotor chamber (4) formed by the sealed pipe (2) and is rotatable. Wherein, an impeller is arranged on an axial end of the rotor shaft (5) for promoting liquid flow, and the impeller is arranged in a pump chamber (15). The sealed pipe (2) includes a radially outwardly extending flange (8) at an impeller side end. A bearing support (9) with a bearing (10) for bearing the rotor shaft is arranged between the sealed pipe (2) and the rotor shaft (5). The bearing support (9) is supported by the sealed pipe (2). A pre-chamber (11) lies between the impeller (7) and the flange (8), and is limited by a dimensionally-stable separator (12, 12a, 12b) in a direction facing to the impeller (7), wherein the pre-chamber is communicated to the rotor chamber (4) by channels (13, 14, 34).

Description

Wet rotor pump with front chamber

Technical field

The present invention relates to a kind of wet rotor pump, this wet rotor pump is with a stator and the rotor that sealed pipe separates.Should comprise a rotor shaft and a rotor combination by wet rotor pump, rotor is supported in by in the formed rotor chamber of sealed pipe, and rotatable.Wherein, rotor shaft is at the impeller of an axial end portion with a promotion flow of fluid, this impeller is arranged in pump chambers, sealed pipe has a flange that roughly extends radially outwardly in the impeller end, be provided with one with the bearing support of bearing between sealed pipe and rotor shaft, for the supporting rotor axle, this bearing block sealed pipe is supporting.

Background technique

In this wet rotor pump, rotor rotates in liquid, and in general, this liquid is equivalent to be transferred fluid, forms thus on the one hand the liquid of rotor chamber and be transferred fluid to produce simultaneously exchange heat, to reach the effect of cooled rotor.Fluid lubricated bearing in rotor chamber, form sliding bearing on the other hand.In the ordinary course of things, water is transferred in rotor chamber and uses.

For seriously by the liquid of particle contamination, such as Armco magnetic iron particle, the magnetic particle that gets rusty, oiling agent material, additive materials, these particles stop in rotor chamber, and can cause that wearing and tearing even block rotor and bearing.Because this reason, rotor chamber can be separated with pump chambers substantially, and can be transferred fluid and separate.This will cause rotor space and pump chamber there is no fluid exchange, so the low cooling of rotor chamber occur.So it is favourable that a liquid-circulating by rotor chamber is arranged.

In general, rotor chamber is the hottest place of wet rotor pump, because the waste heat major part that produces in stator passes to rotor chamber by sealed pipe.If adopt plastic components in rotor chamber, such as bearing made of plastic and bearing shielding, the heat that produces in motor so can not be passed flowing liquid in pump case fully due to the insulating property of plastics.If rotor chamber is filled conventional water, has more lime precipitation so more than 60 ° of C degree temperature.Lime precipitation many or determine according to hardness of water less.For this reason, keeping as far as possible fluid exchange a small amount of between rotor chamber and fluid, is to be worth pursuing.

Therefore task of the present invention is to provide a kind of wet rotor pump, this wet rotor pump is on the one hand when reducing fluid communication to greatest extent, enough effectively heat radiations can be provided, make the heat in rotor chamber enough effectively be delivered in fluid, avoid on the other hand the precipitation of solid particle and the risk of lime precipitation, or this risk is reduced to lowest limit degree.

This above task is solved by the wet described feature of rotor pump claim 1, and favourable expansion scheme belongs under claim to be indicated, and is described in detail as follows.

Summary of the invention

Of the present invention is a kind of wet rotor pump, should wet rotor pump with a stator and the rotor that sealed pipe separates, this rotor comprises a rotor shaft and a rotor combination, and rotor is supported on by in the formed rotor chamber of sealed pipe, and rotatable.wherein, rotor shaft is at the impeller of an axial end portion with a promotion flow of fluid, this impeller is arranged in pump chambers, sealed pipe has a flange that roughly extends radially outwardly in the impeller end, be provided with one with the bearing support of bearing between sealed pipe and rotor shaft, for the supporting rotor axle, this bearing support is that sealed pipe is supporting, a front chamber is arranged between the wheel of the law and flange, this this front chamber is being subject to the slider restriction towards the impeller direction, towards the stator direction towards being subject to flanged limits, wherein, front chamber be by passage and rotor chamber intercommunication link together.

Core idea of the present invention is, a relatively large front chamber is provided between rotor chamber and pump chambers, that is to say, after impeller and between flange, makes the strong turbulence of pump chambers can not enter front chamber.Concerning pump chambers, the flow of fluid in front chamber is rather tranquil to a great extent.This replaces sample to reach by isolation,

Slider separates with pump chambers front chamber from the space, so that the separating of rotor chamber and the eddy current that causes due to impeller.This slider also provides relatively large surface area, can be used as a heat exchanger.In addition, this front chamber/stilling chamber and rotor chamber wherein, between front chamber and rotor chamber, are had enough fluid exchange to occur by passage by bearing support and bearing separation in bearing support, can guarantee necessary exchange heat.

Passage can be located in bearing support, and/or between bearing support and sealed pipe, and/or between bearing and bearing support.By slider, its inwall is recycled fluid and floods, and heat is passed to the conveying liquid in pump chambers subsequently.Therefore slider is herein as heat exchanger.

Another advantage of front chamber is, the particle in rotor chamber or issuable particle, such as lime precipitation or wearing and tearing are piled up in front chamber.If pump is closed, particle falls in the bottom, and is deposited in the bottom of front chamber, and they just can not enter into rotor chamber or can not enter the bearing play of sliding bearing, and can cause there wearing and tearing or damage.

Flange can be molded in and form one on sealed pipe, or as independent parts be inserted on sealed pipe or the insert-seal pipe in.

At least wet rotor pump in working order under, front chamber is preferably in towards the pump chambers direction and closes.Pump is under off working state, and this situation not necessarily will occur.This means, wet rotor pump under off working state, namely under non-pressurized state, front chamber towards the pump chambers direction be close or opening.The embodiment back can be explained.Above-described situation one of them, front chamber all closes under pump work and off working state, wherein, the front chamber in wet rotor pump can be by a tool shape stability, and comprises that the parts of slider consist of.This can prevent that fully the particle in fluid is penetrated into rotor chamber.

In a favourable embodiment, slider can be a filter.Wet rotor pump in working order under, front chamber remains with pump chambers and separates, however liquid can flow through slider.By this way, front chamber and pump chambers can produce fluid exchange, and so further raising heat radiation can guarantee that again the large particle of fluid does not enter pump chambers simultaneously.

Isolator itself can be used as a filter, and/or contains one or more filter components.Along the concentric circle of isolator, these parts can be symmetrical.Therefore, separator does not rely on specific mounting point.Filter element is arranged on radially outer position as far as possible, can reach in front chamber, and/or better ventilation effect in rotor chamber.

Filter component can be by spongiform filter, netted tissue, by metal or plastics and make, secondly filter also can be made by open the little opening that is equivalent to be filtered size of grain on filter self parts, filter component is to be enclosed in (solid) in slider, be fixed in (netted tissue) on slider, or (opening) that consist of in inner slider.If little opening is formed in slider, this slider itself is exactly filter.These openings can be the mode branches of boring a hole on slider surface all or in part.Perhaps slider has reticular structure, and it self can be exactly a filter.

Preferably, front chamber is subjected to the restriction of a capable outer wall of tubular at outward direction radially, and this outer wall is to connect together at a shaft end and flange, and is supporting slider at its another shaft end, or the slider that reclining, or merges with slider.Thereby slider can form one with outer wall, and outer wall is merged in the other end and slider, and perhaps slider is the separate part irrelevant with outer wall, and slider only only lies on outer wall or the outer wall that reclining.

Above-described two kinds of situations, slider is firm, that is to say dimensionally stable and not pliable and tough.In addition, slider also can have certain elasticity and pliability.These features depend primarily on the material that uses and the thickness of slider.

So slider can be to be made by a kind of material, the existing certain shape stability of this material has again pliability.This means, slider can move under pressure, and is particularly rotatable.A kind of have certain thickness elastomeric plastics or a suitable especially slider of making of foil.In the present embodiment, slider and outer wall form one or abut on outer wall.

Perhaps slider can be that shape is unsettled fully, at least in the zone of its radial outside, preferably in the whole zone of slider.The following mode of this slider can obtain, and for example, has above-mentioned reticular structure or is formed by a barrier film.In this case, slider is to have flexiblely equally, but it must by extra support.Owing to lacking shape stability, slider can be fastened on another shaft end of outer wall, is particularly propped up to be clipped in the there, so that the end portion supports of this outer wall slider.

In contrast, for a dimensionally stable, flexible slider, this slider lean against another shaft end of outer wall, do not need to be fixed because of dimensional stability or prop up tight.Particularly pump in working order under, slider abuts in the end of outer wall or lies in the end of outer wall, the back will illustrate.

In order to obtain in the direction towards stator a front chamber that basically closes, outer wall can be attached on flange hermetically.For example can be directly or indirectly by using a sealing lip, seal disc or seal ring and realize, sealing lip, seal disc or seal ring consists of on outer wall and with outer wall formation one, or as an individual components between outer wall and flange.

Preferably, front chamber can at least part of towards the rotor shaft direction be the restriction that is subjected to an inner ring, this inner ring is connected with bearing support, and supports slider or merge into a single whole with slider.Inner ring particularly, inner ring can link together in its one axial end and bearing support, supports slider or merges into a single whole with slider at another shaft end.

In addition, front chamber can seal in the direction towards rotor shaft.This can be directly or indirectly by using a sealing lip, seal disc or seal ring and realize, preferably, by realizing with a dynamic seal (packing) or a bearing ring seal.

Slider is preferentially selected thermally-conductive materials, particularly is made of metal.Such as, isolating plate can be by tinsel, and steel or brass are made.Also can make with the thermal conductivity plastics.So just can guarantee that effectively heat is transmitted, heat can be effectively be delivered to liquid in pump chambers by slider.

The front is mentioned, and at least part of available one of slider has flexible barrier film to make.This barrier film has advantages of: it can bear pressure pulse, for example, and the pressure pulse that occurs when the opening and closing pump.In addition, it can also provide the isostasy between rotor chamber and pump chambers.This barrier film can be made by flexible plastic materials or metal, for example, and Steel Diaphragm.Steel Diaphragm has higher heat-transfer coefficient than plastic diaphragm, therefore can reach better heat-transfer effect.

In making the embodiment of slider with barrier film, slider can be fixed on the inboard of inner ring, and for example, it is attached to, and is welded on or firmly is clamped on the axle collar of inner ring.Barrier film also can be securely fixed on outer wall.

Yet barrier film if hover ground lies on the front of the outer wall axle head of impeller, is favourable.In order to increase surface of contact, outer wall can have a convex surface that radially inwardly points to, and can allow barrier film overlie.Due to the pressure of the pump chambers pressure greater than rotor chamber, barrier film is crushed on the front of outer wall.So barrier film does not need by extra, omnibearing fixing.Barrier film is fixed on one or several position of outer wall, so that barrier film keeps its position, this installation for pump has special help.Pump in working order under, barrier film is liquid-tight, but non-hermetic front that is attached to outer wall.This can guarantee, when pump brings into operation, when rotor chamber was filled liquid, gas overflowed from the rotor chamber top.In addition, pump is when out of service, and the liquid in rotor chamber also can overflow by the gap between barrier film and outer wall front.

Preferably, slider is near impeller, and wherein, the distance between impeller and slider is selected, and should depend on the diameter of impeller, and particularly, this distance can be 0.015 times to 0.04 times of impeller diameter.Because there is the strong turbulence in the impeller back, can cause hydraulic slip, impel the gap that less is arranged between impeller and slider, make turbulent flow reduce, thereby increase work efficiency.

Wet rotor pump of the present invention, bearing support and sealed pipe can form one.Here, bearing support is preferably selected made of plastic together with sealed pipe.Beyond above-mentioned feature, additional or alternatively, bearing support and bearing integrator, and the bearing block assembly that becomes.In the case, bearing block assembly is preferably selected made of plastic.

Except the above embodiments, additional or alternatively, slider or at least inner ring can form one with bearing support.Additional or alternatively, slider can form one with inner ring, particularly is made of plastics.This is suitable, is the wall of dimensionally stable when slider, for example in order to admit above-mentioned filter element.

Outside above-mentioned function, additional or alternatively, sealed pipe has a bottom at it back to the axial end portion of impeller, be used for closing rotor chamber, so sealed pipe becomes a so-called sealing pan.

One of above-mentioned embodiment's feature, additional or alternatively, fixing for slider, outer wall especially link together with coaxial inner ring by cross bar radially.If this slider is made by barrier film, the unsettled barrier film of shape especially, this is particularly advantageous.This barrier film can lie on cross bar, and is particularly loose or only be fixed on other several positions, and is being supported by cross bar.

Another favourable aspect according to the present invention, except feature described above, additional or alternatively, wet rotor pump is under idle state, namely under non-pressurized state, slider can form the gap at its warp-wise between the part area of periphery circle and outer wall, wet rotor pump in working order under, slider can be crushed on outer wall.If slider abuts on outer wall, front chamber can be closed so.As wetting rotor pump under off working state, there is distance between slider and outer wall, outer wall and slider have a gap so, so, can overflow from front chamber according to the position one side gas in gap, and/or particle can be overflowed from front chamber on the other hand, and in addition, liquid can enter front chamber in the process of filling pump.

Wet rotor pump that is to say under non-pressurized state under idle state, and preferably, slider is gapped between the part area of its warp-wise periphery circle and outer wall, according to the mounting point of pump, this part area be located at pump below.Pump is under off working state, and the particle that once rotated everywhere in front chamber drops to the bottom, and can continue to drop to pump chambers by the gap between slider and outer wall, and when started the next time of pump, particle was transferred away therefrom.

In order to realize that particle falls into the inside of pump chambers chamber, regional downward-sloping towards the impeller direction at least of the inboard of outer wall.Then particle can prolong the slope down sliding and falling into pump chambers.

Above-described in order to realize, slider can be one flexible annular disk, especially available by dimensionally stable, elastomeric plastics or one thin, the tinsel that can move is made.The plastics of tinsel or dimensionally stable are with an elastic diaphragm ratio, and the advantage that has is, it in the situation that thickness identical have more shape stability and do not need be fixed on outer wall.In addition, such slider can bear larger power, and better the heat of front chamber is delivered in liquid in pump chambers.Transverse bar between outer wall and inner ring can be omitted, so that the liquid of front chamber better comes through slider for heat radiation energy.

Particularly advantageously be, if wet rotor pump is under idle state, that is to say under non-pressurized state, slider is not only in its warp-wise periphery circular portion zone, and also gapped between full zone of its warp-wise periphery and outer wall, and wet rotor pump in working order under, slider is forced on outer wall.Therefore, the particle of bottom and top gas can be overflowed from front chamber, and do not need to depend on the slider installation direction with respect to wet rotor pump mounting point.

Except above-mentioned feature, additional or alternatively, the inboard of outer wall can tilt to impeller in the bottom of front chamber at least.This refers to, the inboard of outer wall, and enlarged in the distance towards the impeller direction between the running shaft of impeller and pump shaft.This also refers in the front chamber bottom, and with respect to the mounting point of wet rotor pump, inclination is downward, namely along the center of gravity force direction.In further modified embodiment, above-described inclination can fully continue, and is rotational symmetric thereby make front chamber.That is to say, front chamber opens in the direction towards pump chambers, or the outer wall inboard is conical in the direction towards stator.This advantage that has is in order to realize can sliding into forward in pump chambers at particle of front chamber's bottom accumulation, not depend on the outer wall position with respect to the pump mounting point.

In order to realize a kind of front chamber, the outer wall that radially is restricted of this front chamber and outer wall inboard tilt towards the impeller direction, can use the outer wall that has single wall and have constant thickness so, and outer wall integral body is conical in the direction towards stator.This that is to say, the outside of outer wall is conical in the direction towards stator.Perhaps outer wall can be leg-of-mutton at axial cross section, and wherein, the thickness of outer wall is more and more less towards impeller side, and the internal diameter of front chamber becomes larger simultaneously.Another kind of may, outer wall can be double-walled in each embodiment, wherein, inboard first wall can limit front chamber, its shape conforms to the above-mentioned outer wall that has single wall and have a constant thickness, however second wall in the outside is to become axle parallel with rotor shaft.Inboard first wall and second wall in the outside form acute angle and merge into a single whole in the front towards impeller.

Except above said feature, add or alternatively, be delivered to the radiating effect of front chamber in order to improve heat, slider can usually increase surface area with structural elements.These structural elements can be thread-shaped, channel shaped, the brief summary particle shape, crimping shape, or groove type.

Preferably, these structural elements are positioned at the slider reverse side towards front chamber, and are positive if structural element is located at towards the slider of front chamber, can cause hydraulic slip.

Structural element can improve the absorption of heat at the reverse side of slider.For efficiently radiates heat better, be to be molded in positively as structural element, structural element is towards the direction of impeller towering-up too not so, hydraulic slip is not too large like this, and structural element can have various ways to mould, as: radially, secant shape, circular concentric, or spiral.

The another kind of preferred expansion scheme of wet rotor pump according to the present invention, except top described feature, additional or alternatively, bearing support has a wheel rim that extends towards outer wall at it towards the shaft end of impeller, and this wheel rim is divided into one to front chamber towards cup and the rear chamber back to pump chambers of pump chambers direction.This wheel rim also can be used as a partitioning wall, can guide targetedly the flow of fluid of front chamber.

Preferably, above-mentioned cup and rear chamber are at least by an open communication together, so that liquid can flow to from space, a chamber another space, chamber.Wheel rim has an opening, and this opening is formed by the distance between wheel rim and outer wall.

At least one opening can be annular, that is to say wheel rim with the outer wall inboard certain distance arranged local eventually on.Alternatively, also a plurality of openings can be arranged.These a plurality of openings also can form in wheel rim or by the distance between wheel rim and outer wall.

If a plurality of openings are arranged, wheel rim can be together with outer wall be merged into, and wherein, these openings are arranged on the wheel rim wheel rim.

Single opening or a plurality of opening in above-mentioned are positioned at radially outer position, farthest pass through slider in order to shove.

Preferred expansion scheme one of in above embodiment, front chamber, particularly its cup have one towards the open space of rotor shaft.In this open space, rotor shaft can support another impeller, and this impeller can promote the flow of fluid in front chamber of at least part of radial direction.Another impeller can be a turbine or a disk, and the axle front has groove or screw thread, and this is in order to promote liquid to carry.Such as, groove or screw thread can be screw types.Impeller should be less, is convenient to produce minimum flow.So, between in the radial direction impeller length only need to the rotor shaft radius 1/4 and 1/3.

Preferably, rotor shaft is one and can flows through by center hole liquid with the hollow shaft of center hole, and this hollow shaft is open at the axle head of impeller dorsad, and merges to therefrom rotor chamber.

With respect to the axial direction of rotor shaft, rotor shaft can have one or more lateral bores, and by lateral bore, the liquid in rotor shaft can flow into front chamber.Above-described one or more lateral bore plays the effect that connects center hole and front chamber, thereby realizes liquid-circulating.These lateral bores have promoted flow of fluid, so above mentioned another impeller is unwanted basically.But additional or extra use also is fine.

If use a turbine as extra impeller, before its blade can extend to boring along axial direction so, so that rotor shaft when rotation, blade additionally accelerated flow of fluid.Simultaneously produce low pressure in lateral bore, by this low pressure, the liquid in rotor chamber is inhaled in rotor shaft.In addition, blade is carried the liquid radially outward in front chamber, wherein, and the reverse side of liquid stream process partitioning wall, and can pass to isolating plate to its heat.

Even another impeller does not exist, also can because of temperature gradient and the centrifugal force in the lateral bore zone, therefore be created in the liquid-circulating in rotor chamber and front chamber.

In outer regions, liquid can be after axial direction flows to from cup the chamber, and therefrom by the passage between bearing support and sealed pipe, and/or the person enters rotor chamber by the passage between bearing support and bearing, liquid is heated in rotor chamber, and flows into rotor shaft at the rotor axle head.Therefore an effective cooling system is kept, and by this cooling system, the heat of rotor chamber is effectively loose on the slider between front chamber and pump chambers, and then, slider is delivered to heat in the liquid of pump chambers.

Other advantage of the present invention and feature will describe in further detail by following examples and accompanying drawing.

Description of drawings

The partial view of accompanying drawing 1 axial cross section is according to a kind of wet rotor pump of invention, with the slider of a large front chamber and dimensionally stable

The partial view of accompanying drawing 2 axial cross sections is according to the wet rotor pump of another kind of invention, with a large front chamber and the slider made with flexible barrier film is arranged

Accompanying drawing 3 longitudinal cross-sectional view are according to the wet rotor pump of another kind of invention, with the thermal cycle of a front chamber that is separated and vane drive

The zoomed-in view of accompanying drawing 4 bearing block assemblies (with reference to the accompanying drawings 3)

The specific embodiment explanation

Accompanying drawing 1 has shown the axial cross section Local map of wet rotor pump 1 in this invention.This figure has only shown pump 1 hydraulic part and the transition zone that is connected pump 1 motor, and this part is fully to demonstrate in Fig. 3.Pump 1 comprises the rotor 5,6 that stator 3 and sealed pipe 2 separate, and this rotor comprises rotor 5 and rotor combination 6, and is supported in by 4 li of the rotor chambers of sealed pipe 2 shape, and rotatable, please see accompanying drawing 3.Rotor combination 6 comprises permanent magnet, and permanent magnet is not further shown in figure.

Rotor shaft 5 is projected into 15 li of pump chambers at an axial end portion, and supports an impeller 7 at that, to promote flow of fluid.Sealed pipe 2 has a large supreme flange that extends radially outwardly 8 in the end on its impeller one side.Having one with the bearing support 9 of sliding bearing 10 between flange 8 and rotor shaft 5, is for support rotor axle 5.Sliding bearing 10 is to be fixedly mounted in 9 li of bearing supports.Bearing support 9 is again to be fixedly mounted in 2 li of sealed pipes.There is one to be used for the annular front chamber 11 that stable liquid flows between impeller 7 and flange 8.This front chamber 11 is being subjected to the restriction of slider 12 towards impeller 7 directions, slider 12 is dimensionally stable in this embodiment.In the direction towards stator 3, front chamber 11 is limited by flange 8.Only being communicated with by being located at the external chennel 14 between bearing support 9 and sealed pipe 2 and being located at the internal channel 13 of sliding bearing 10 and bearing support 9 between ante-chamber 11 and rotor chamber 4.

In the side towards pump chambers 15 bearing supports 9, a parts 30a is arranged, in order to insert dynamic seal (packing) 30, dynamic seal (packing) 30 is the rotor shafts 5 for seal rotary.Can keep little media flow with labyrinth or clearance sealing component as a dynamic sealing 30.In addition, in the side towards pump chambers 15 bearing supports 9, parts 35 are arranged, have the form of a circular groove, slider 12 is to be inserted in this circular groove.Thereby form the sealing surface of a circle in the area of contact of slider and bearing support 9.

Slider 12 is with a kind of dimensionally stable, has that the material of high heat-transfer coefficient makes, such as, be to be made by the plastics with Heat Conduction or metal, it separates trapping chamber 11 with pump chambers 15.Slider 12 has the shape of a porous disc.Due to the rotation of the rotor shaft 6 in running, also be brought at the liquid of 4 li of rotor chambers and rotatablely move.Heat is transferred to rotor chamber 4 from stator 3 by sealed pipe 2, and by the liquid absorption 4 li of rotor chambers.Liquid arrives front chamber 11 by internal channel 13 and external chennel 14.Slider 12 plays the effect of heat exchanger plate, and the conveying liquid that heat is passed to 15 li of pump chambers flows.

In the example shown in Fig. 1, front chamber 11 mainly closes, no matter in the working state of rotor pump 1 that wets, or at off-mode.Front chamber 11 is subject to the restriction of a tubular outer wall 16 in the radially outward direction.

This outer wall 16 is parallel to the axial of rotor shaft 5, and abuts in hermetically on flange 8 at an axial end portion.This flange 8 has an annular projection 28 that extends towards pump chambers 15, and outer wall 16 abuts on its inboard.Installing in the zone at this has a projection 29, extends and pressing hermetically the inboard of projection 28 along outer wall 16 circumference.Be transitioned into slider 12 at its another axial end portion from outer wall 16, this illustrates that they form as one.Therefore the axial length of outer wall can be described as the existence of a large front chamber 11 no better than the width of porous disc profile slider 12 in radial direction.

In addition, ante-chamber 11 is also sealed towards rotor shaft 5 directions.Be to produce like this in the example shown in accompanying drawing 1, front chamber 11 is subject to the restriction of an inner ring 17 in the direction towards rotor shaft 5, and inner ring 17 abuts on bearing support 9, particularly lies in 35 li of annular elements.Inner ring 17 is also to form one with slider 12.Slider 12, inner ring 17 and outer wall 16 form the shielding of a hat.As above-mentioned in institute, dynamic seal (packing) 30 is positioned at the axial end portion towards the bearing support 9 of pump chamber 15, prevents that mainly liquid from entering the open space of bearing support 9 along rotor shaft 5, thereby enters front chamber 11.

Slider 12 is near impeller 7, and the distance between impeller 7 and slider is less than 4% of impeller diameter.Increase like this hydraulic efficiency of wet rotor 1.

Wet rotor pump in working order under, liquid flows to axial chamber 4 from front chamber 11 by the passage 14 between sealed pipe 4 and bearing support 9.In addition, the rotor shaft 5 that liquid is rotated is transferred by the bearing play, and flow out at an axial end portion of bearing 10, at a passage 13 that flows into therefrom between bearing 10 and bearing support 9, flow into the bearing play from the lubricated liquid of passage 13 some conduct at another axial end.Thus by the bearing play, produced in the roller chamber liquid-circulating of 4 li.

Fig. 2 illustrates another embodiment of wet rotor pump 1 of the present invention., use a slider that flexible barrier film 12a arranged to replace the slider 12 of dimensionally stable here, barrier film 12a is made with flexible material.

Barrier film 12a is fixed on inner ring 17, and wherein, it is being clamped on the axle collar of inner ring 17 securely.On the front of impeller 7 direction outer wall 16 axle heads, barrier film 32 is loose overlies, and when impeller 7 rotation, making thus barrier film 32 is liquid-tight spare ground, but is forced on outer wall 16 non-hermeticly at least.This advantage that has is, in the process of filling up pump 1, the liquid of being carried by pump can enter rotor chamber 4 by a very little gap, and air can overflow at rotor chamber 4 or at the peak of front chamber 11.Pump 1 in working order under, form a pressure difference between pump chambers 15 and rotor chamber 4, this pressure difference presses against separator 12a on outer wall 16 tightly, simultaneously separator 12a is comprised that inner ring 17 presses against 35 li of the parts of bearing support 9.

In order to stablize barrier film 12a, outer wall 16 is to be joined together with coaxial inner ring 17 by cross bar 17a radially.When moving, barrier film 12a can be pressed towards the rear due to the pressure of 15 li of pump chambers, so barrier film 12a also can lie on cross bar 17a when pump 1.

Fig. 3 shows another embodiment of wet rotor pump of the present invention.In this embodiment, bearing support has double wall design.Have passage 34 between an outer wall and inwall, wherein, outer wall abuts on sealed pipe 2 inboards, and sliding bearing 10 abuts on inwall with its periphery.Front chamber 11 be by passage 34 with to rotor chamber 4 intercommunications link together.In addition, bearing support 9 has a wheel rim 18 that extends to outer wall at it towards the axial end of impeller 7, and wheel rim 18 is separated into chamber 20 after a cup 19 and to front chamber 11, wherein, cup 19 is towards pump chambers 15, and rear chamber 20 is pump chambers 15 dorsad.Wheel rim 18 is shape all-in-one-pieces with outer wall 16, and is transitioned into 16 li of outer walls by a plurality of tie points.Bearing support 9, therefore wheel rim 18 and outer wall 16 form co-molded parts.Have opening 21,22 between tie point, cup 19 links together by these openings with rear chamber 20.Therefore opening 21,22 is positioned at radially outer position, makes slider 12 almost completely to be come through by the circulating liquid of 19 li of cups.

There is an area of space 23 of partly opening towards rotor shaft 5 directions in front chamber 11.In this area of space 23,

impeller

24,27 band blades 27 are fixed on rotor shaft 5, and impeller 24 can cause the flow of fluid of part radial direction at least.Impeller 24 is arranged between Simmer ring 30 and bearing 10, and is located on rotor shaft 5.

Rotor shaft 5 is designed to a hollow shaft, and with a center hole 25 that can lead to liquid, this hole is open in axle 5 orientation, end of impeller 7 dorsad, and merges to therefrom 4 li of rotor chambers.Rotor shaft 5 another ends are closed.Sealed pipe 4 it dorsad an end of pump chambers 15 closed by bottom 31, thereby form a sealing pan.31 bearings 32 that a support rotor axle 5 arranged again in the bottom.

At the axial direction of rotor shaft 5, be positioned at the position of rotor shaft impeller 24, rotor shaft 5 has one or more transverse holes 26, and by transverse holes 26, liquid can be poured into front chamber 11 by the center hole 25 of rotor shaft 5.

At this, the blade 27 of impeller 24 extends to the front of transverse holes 26 at axial direction, to such an extent as to produce suction, the liquid of 5 li of hollow shafts is gushed out thus.The flow of fluid of at least a portion radial direction can be caused alone by transverse holes 26, so impeller 24 is not indispensable.

Impeller 24 radially outwards carry liquid and through slider 12b, wherein, the heat of liquid is passed on slider.Liquid flow into rear chamber 20 by the

opening

21 and 22 of 18 li of wheel rims from cup 19, and rear chamber 20 is that the passage 34 by 9 li of radial inlet 33 and bearing supports is connected together.Liquid flows to 4 li of rotor chambers by import 33 and passage 34, and absorbs heat.At the back side of rotor chamber 4, liquid flows into the end of rotor shaft 5 openings, and flows to and be positioned at impeller 24 positions, both transverse holes of 5 li of rotor shafts, and liquid flows out from rotor shaft 5 again therefrom, flows through slider 12b, and its heat is delivered on slider.Formed by this way an effective and enclosed cooling system.

The amplification of impeller one side bearing assembly is shown in 4 li, accompanying drawing.

With reference to the accompanying drawings 3 with the embodiment of accompanying drawing 4 in, slider 12b is made with having flexible tinsel.Wet rotor pump is under off position, namely under non-pressurized state, isolation 12b is in the whole zone of its radially outer circumferential edges and the positive formation of outer wall 16 gaps, and wet rotor pump 1 in working order under, slider 12b is because the pressure in pump chambers is crushed on outer wall 16.When the hydraulic system that comprises pump 1 entered working state and be full of by liquid, liquid can infilter and be full of rotor chamber 4 by the gap of slider 12 with outer wall 16, and air can be overflowed by this gap simultaneously.

As the advantage of advancing one one, 11 li of front chamber, particularly 19 li of cups, particulate matter and sludge can sink to the bottom, and can rest on the inboard of outer wall 16.For these particulate matters can enter pump chambers 15, the inboard of outer wall 16 can tilt in the direction towards impeller 7, and the expansion scheme of this pump 1 does not show in the accompanying drawings.Particulate matter glides at formed slope, slips into pump chambers 15 by the gap, and pump 1 needs only a rearming, and particulate matter will be output therefrom again.

Claims

1. the rotor (5,6) that separates with a stator (3) and a sealed pipe (2) of wet rotor pump (1).Should comprise a rotor shaft (5) and a rotor combination (6) by wet rotor pump, rotor is supported in by the formed rotor chamber of sealed pipe (2) (4) inner, and rotatable.wherein, rotor shaft (5) is at the impeller of an axial end portion with a promotion flow of fluid, this impeller (7) is arranged in pump chambers (15), sealed pipe (2) has a flange that roughly extends radially outwardly (8) in the impeller end, be provided with a bearing support with bearing (10) (9) between sealed pipe (2) and rotor shaft (5), for supporting rotor axle (5), this bearing block sealed pipe (2) is supporting, it is characterized in that, between impeller (7) and flange (8), a front chamber (11) is arranged, this front chamber towards impeller (7) direction by a slider (12, 12a, 12b) limit, and limited by flange (8) towards stator (3) direction, wherein, front chamber (11) is by passage (13, 14, 34) be communicated with rotor chamber (4).

2. wet rotor pump as claimed in claim 1 (1), is characterized in that, wet rotor pump (1) in working order under, front chamber (11) is closing towards pump chambers (15) direction.

3. wet rotor pump as claimed in claim 1 or 2 (1), is characterized in that, passage (13,14,34) be located at bearing support (9) inner, or be located between bearing support (9) and sealed pipe (2), or be located between bearing (10) and bearing support (9).

4. wet rotor pump as claimed in claim 1 (1), is characterized in that, slider (12,12a, 12b) is a filter.

5. wet rotor pump as claimed in claim 4 (1), is characterized in that, has at least a filter to be arranged on (12,12a, 12b) in slider.

6. wet rotor pump as claimed in claim 4 (1), is characterized in that, slider (12,12a, 12b) is that reticular structure is arranged.

7. as above wet rotor pump claimed in claim 1 (1), it is characterized in that, front chamber (11) is subject to the restriction of pipeline section shape outer wall (16) in the radially outward direction, this front chamber (11) is to link together with flange (8) at its shaft end, another shaft end at it is supporting slider (12,12a, 12b), the slider that reclining, or be integrated with it.

8. wet rotor pump as claimed in claim 7 (1), is characterized in that, outer wall (16) flange (8) that closely reclining.

9. as above wet rotor pump claimed in claim 1 (1), it is characterized in that, front chamber (11) is sealing towards rotor shaft (5) direction.

10. as above wet rotor pump claimed in claim 1 (1), it is characterized in that, slider (12,12a, 12b) is made by Heat Conduction Material.

11. as above wet rotor pump claimed in claim 10 (1), it is characterized in that, slider (12,12a, 12b) is made of metal.

12. as above wet rotor pump claimed in claim 1 (1), it is characterized in that, slider (12,12a, 12b) is at least part of is one has flexible every film formed.

13. as above wet rotor pump claimed in claim 7 (1), it is characterized in that, slider (12,12a, 12b) hover ground lies on the front of the outer wall (16) of impeller (7) axis of orientation end.

14. as above wet rotor pump claimed in claim 1 (1), it is characterized in that, front chamber (11) is towards at least part of restriction that is subject to a coaxial inner ring (17) of rotor shaft (5) direction, inner ring (17) is to link together with bearing support (9), and support slider (12,12a, 12b) or be integrated with it.

15. as above wet rotor pump claimed in claim 1 (1), it is characterized in that, the distance between impeller (7) and slider (12,12a, 12b) is 0.015 times to 0.04 times of impeller diameter.

16. as above wet rotor pump claimed in claim 1 (1), it is characterized in that, bearing support (9) and sealed pipe (2) are the shape all-in-one-pieces.

17. as above wet rotor pump claimed in claim 1 (1), it is characterized in that, bearing support (9) and bearing (10) are the shape all-in-one-pieces.

18. wet rotor pump as described in above claim 1 or 17 (1) is characterized in that, slider (12,12a, 12b) and bearing support (9), or inner ring (17) is the shape all-in-one-piece with bearing support (9) at least.

19. wet rotor pump as described in above claim 14 (1) is characterized in that, for firm slider (12,32), outer wall (16) links together with coaxial inner ring (17) by whippletree radially.

20. as above wet rotor pump claimed in claim 1 (1), it is characterized in that, wet rotor pump (1) is under off position, namely under non-pressurized state, front chamber (11) is being open towards pump chambers (15) direction, wet rotor pump (1) in working order under, front chamber (11) is closing towards pump chambers (15) direction.

21. as above wet rotor pump claimed in claim 7 (1), it is characterized in that, wet rotor pump (1) is under off position, namely under non-pressurized state, slider (12a, 12b) forms the gap in the part area of its radially outward circumferential edges and outer wall (16), and wet rotor pump (1) in working order under, slider (12a, 12b) is crushed on outer wall (16).

22. wet rotor pump as claimed in claim 21 (1), it is characterized in that, wet rotor pump (1) is under off position, namely under non-pressurized state, at slider (12a, the gap that 12b) forms between circumferential edges and outer wall (16) is the below that is positioned at wet rotor pump (1) mounting point, and the inboard of outer wall (16) tilts towards impeller (7) direction in this zone at least.

23. wet rotor pump as described in above claim 21 or 22 (1), it is characterized in that, wet rotor pump (1) is under non-pressurized state, slider (12a, 12b) form the gap in the whole zone of its radially outer circumferential edges and outer wall (16), and wet rotor pump (1) in working order under, slider (12,12a, 12b) be crushed on outer wall (16).

24. wet rotor pump as described in above claim 22 (1) is characterized in that, the inboard of outer wall (16) fully tilts towards impeller (7) direction.

25. as above wet rotor pump claimed in claim 1 (1), it is characterized in that, slider (12,12a, 12b) has the structural element that increases surface area.

26. wet rotor pump as described in above claim 25 (1) is characterized in that, slider (12,12a, 12b) has the structural element that increases surface area, and its structural element is positioned at the reverse side towards the slider of front chamber (11) (12,12a, 12b).

27. as above wet rotor pump claimed in claim 1 (1), it is characterized in that, bearing support (9) has a wheel rim (18) that extends towards outer wall (16) at it towards the shaft end of impeller (7), and this wheel rim (18) is divided into a cup towards pump chambers (15) (19) and the rear chamber (20) back to pump chambers (15) to front chamber (11).

28. wet rotor pump as claimed in claim 27 (1) is characterized in that, cup (19) and rear chamber (20) are interconnected by at least one or a plurality of opening (21,22).

29. wet rotor pump as claimed in claim 28 (1) is characterized in that, is positioned at warp-wise at the inner opening of front chamber (11) or a plurality of opening (21,22) outside.

30. as above wet rotor pump claimed in claim 1 (1), it is characterized in that, front chamber (11) has one towards the area of space (23) of at least part of opening of rotor shaft (5), at this area of space, rotor shaft (5) supports another impeller (24,27), in order to produce part flow of fluid radially at least.

31. as above wet rotor pump claimed in claim 1 (1), it is characterized in that, rotor shaft (5) be one with the hollow shaft of center hole (25), this hollow shaft is open in rotor shaft (5) end of impeller (7) dorsad, and leads to therefrom rotor chamber (4).

32. wet rotor pump as described in above claim 31 (1) is characterized in that, rotor shaft (5) has one or more lateral bores (26), and by lateral bore (26), the inner liquid of rotor shaft (5) can flow into front chamber (11).

33. wet rotor pump as described in above claim 30 (1) is characterized in that, another impeller (24,27) is a turbine, and its turbine blade (27) extends to the front of transverse holes (26) or a plurality of transverse holes (26) at axial direction.