CN117072435A

CN117072435A - Vane pump

Info

Publication number: CN117072435A
Application number: CN202311252313.1A
Authority: CN
Inventors: 李东林; 闫有朋; 马先帅; 王帅; 王军华; 刘明伟; 李跃; 张笑琼; 赵中校
Original assignee: Henan University of Science and Technology
Current assignee: Henan University of Science and Technology
Priority date: 2023-09-26
Filing date: 2023-09-26
Publication date: 2023-11-17

Abstract

The present utility model relates to a liquid pump with a vane reciprocating relative to an internal member, and more particularly to a vane pump. The vane pump comprises a pump shell, wherein a stator, a rotor, a suction valve plate and an extrusion valve plate are arranged in the pump shell, the rotor is positioned in the stator and is in running fit with the pump shell through a rotating shaft, the rotating shaft is in running fit with the pump shell through a first rotating part close to the extrusion valve plate and a second rotating part close to the suction valve plate, a cooling flow passage which is connected with a discharge valve opening of the extrusion valve plate and the first rotating part of the rotating shaft is arranged on the extrusion valve plate, and a circulating passage which leads to an inlet of the pump shell is arranged on the rotating shaft. When the vane pump is used, a high-pressure medium extruded out of the flow distribution window of the flow distribution plate reaches the first rotating part through the cooling flow passage and flows to the inlet of the pump shell through the circulating passage to form circulation, so that the various parts on the circulating path are cooled down, heat accumulation is avoided, and the problem of low heat dissipation efficiency of the conventional vane pump can be solved.

Description

Vane pump

Technical Field

The present utility model relates to a liquid pump with a vane reciprocating relative to an internal member, and more particularly to a vane pump.

Background

The vane pump is a liquid pump widely applied to the fields of machine tools, plastic machines, leather machines, forging machines, engineering machines and the like, and has the advantages of large flow, high pressure, small pulsation, high efficiency and low noise. The pump housing, stator, rotor, shaft, vanes, intake port plate and extrusion port plate are the main components of the vane pump. The pump shell comprises a cylinder body and end cover devices positioned at two ends of the cylinder body, the stator is fixedly arranged in the pump shell, the rotor is eccentrically arranged in the pump shell through a rotating shaft and the stator, the blades are movably arranged in rotor grooves arranged on the outer peripheral surface of the rotor, and the suction valve plate and the extrusion valve plate are respectively and correspondingly arranged at one side of the rotor, which is close to the suction inlet and the extrusion outlet of the pump shell.

When the vane pump works, the rotating shaft is in transmission connection with the power device, and then the rotor is driven to rotate, and the vanes are clung to the inner wall surface of the stator by virtue of centrifugal force in the process of rotating the rotor. Regarding the structure and working principle of the conventional vane pump, the description of the chinese utility model patent with the grant publication number CN204126908U and the grant publication date 2015, 8 and 28 is clearly described, and will not be repeated here.

Because the rotor pump is in running fit between the rotating shaft and the pump shell at two axial sides of the rotor, pumped media cannot reach the running fit position, after a period of use, the heating phenomenon can be generated inevitably at the fit position of the rotating shaft and the pump shell, and after heat is accumulated to a certain extent, the temperature at the corresponding position can be increased, so that the pumped media are deteriorated, and the aging of the sealing part is accelerated. In addition, there may be poor lubrication at the running fit location because the pump cannot reach the running fit location.

Disclosure of Invention

The utility model aims to provide a vane pump so as to solve the problem of low heat dissipation efficiency of the conventional vane pump.

In order to solve the problems, the vane pump adopts the following technical scheme: the vane pump comprises a pump shell, wherein a stator, a rotor, a suction valve plate and an extrusion valve plate are arranged in the pump shell, the rotor is positioned in the stator and is in running fit with the pump shell through a rotating shaft, the rotating shaft is in running fit with the pump shell through a first rotating part close to the extrusion valve plate and a second rotating part close to the suction valve plate, a cooling flow passage which is connected with a first rotating part of the extrusion valve plate, a suction valve plate and a rotating shaft is arranged on the extrusion valve plate, and a circulating passage which leads to an inlet of the pump shell is arranged on the rotating shaft.

The beneficial effects are that: the technical scheme of the vane pump is created for the improved utility model. Specifically, the utility model provides a cooling flow path between the extrusion flow distribution window of the extrusion flow distribution plate and the first rotating part of the rotating shaft, and a circulating channel leading to the inlet of the pump shell is arranged on the rotating shaft. Therefore, when the vane pump is used, a high-pressure medium extruded out of the flow distribution window of the flow distribution plate can reach the first rotating part through the cooling flow passage and flow to the inlet of the pump shell through the circulating passage to form circulation, so that the various parts on the circulating path are cooled down, heat accumulation is avoided, and the problem of low heat dissipation efficiency of the conventional vane pump can be solved.

Still further, the circulation passage includes a through hole provided in the rotation shaft, the through hole having an outlet located at a side of the second rotation portion facing away from the inlet of the pump housing. The through hole is provided with an outlet which is positioned at one side of the second rotating part, which is far away from the inlet of the pump shell, so that the circulating medium can pass through the second rotating part, and the second rotating part is cooled in the circulating process.

Further, an annular cavity is arranged between the rotating shaft and the inner wall of the pump shell at the outlet. The annular chamber acts to distribute the circulating medium to promote uniform cooling throughout the second rotating portion.

Further, the cooling flow passage is formed by a flow passage groove provided on the surface of the extrusion port plate. The cooling flow channel is formed by adopting the through flow grooves on the surface, and the processing is convenient.

Further, a transfer cavity is arranged between one end of the rotating shaft, which is close to the first rotating part, and the inner wall of the pump shell, and an inlet of the circulating channel is positioned in the transfer cavity. The arrangement of the transfer chamber may provide the circulation channel with inlets that are more convenient to arrange and may facilitate control of the size of the inlets.

Further, the transfer cavity is located between the end face of the rotating shaft and the inner wall of the pump shell. The transfer cavity with the structure has the advantages of simple structure and convenience in processing.

Further, a bearing is provided on the pump housing at the first rotating portion and/or the second rotating portion. The bearings allow a more uniform gap to be formed at the corresponding rotating portions for the passage of the cooling medium.

Further, the bearing is arranged at the second rotating part, the bearing is a sliding bearing, and a spiral liquid discharge groove is arranged on the inner wall of the sliding bearing. The spiral liquid discharge groove can improve the flow efficiency of the cooling medium.

Still further, the pivot still have with the third rotation portion of pump case rotation sealing fit, third rotation portion is located the one side of second rotation portion back to first rotation portion, is equipped with sealing device appearance chamber between second rotation portion and third rotation portion, sealing device appearance chamber communicates with each other and constitutes with the pump case import the part of circulation passageway. The sealing device containing cavity at the third rotating part can cool the third rotating part, and the overall heat dissipation efficiency of the vane pump is further improved.

Further, the pump housing inlet is provided on a radial side of the pump housing. The pump shell inlet is arranged on one radial side of the pump shell, so that the arrangement of the circulating channel can be facilitated, and the structure is simple.

Drawings

FIG. 1 is a schematic diagram of an embodiment of a vane pump of the present utility model;

FIG. 2 is a front view of the outlet end cap of FIG. 1;

FIG. 3 is a cross-sectional view of FIG. 2;

FIG. 4 is a cross-sectional view of the inlet end cap of FIG. 1;

FIG. 5 is a left side view (with partial cutaway) of FIG. 4;

FIG. 6 is a schematic view (with partial cutaway) of the shaft and rotor of FIG. 1;

FIG. 7 is a cross-sectional view of the shaft and rotor of FIG. 6;

FIG. 8 is a B-B cross-sectional view of FIG. 6;

fig. 9 is a front view of the extrusion port plate of fig. 1;

fig. 10 is a cross-sectional view of the extrusion port plate of fig. 9;

FIG. 11 is a rear view of the extrusion port plate of FIG. 9;

fig. 12 is a front view of the intake port plate of fig. 1;

FIG. 13 is a cross-sectional view of FIG. 12;

fig. 14 is a perspective view of the intake port plate of fig. 12.

In the figure: 101. a pump housing; 11. a cylinder; 12. an outlet end cap; 121. an outlet kidney-shaped aperture; 122. a groove; 123. an outlet end bearing; 13. an inlet end cap; 131. an inlet kidney-shaped aperture; 132. an interface; 133. a communication port; 134. an inlet end bearing; 135. a spiral groove; 14. an outer end cap; 15. a spring; 16. a cushion pad; 17. a compression ring; 18. a bearing ring; a 19-ring cover; 102. a rotating shaft; 21. a first rotating part; 22. a second rotating part; 23. a third rotating part; 24. a through hole; 103. a rotor; 31. a vane groove; 32. equalizing holes; 33. a slide bar hole; 34. a seal slide bar; 104. a blade; 105. extruding a valve plate; 51. extruding a flow distribution window; 52. extruding a disc lubrication groove; 53. a cooling channel; 54. extruding a disc substrate; 55. extruding a wear-resistant layer of the disc; 106. a suction port plate; 61. a suction distribution window; 62. a suction disc lubrication groove; 63. a suction disc base; 64. a suction disc protective layer; 107. an inlet fitting; 108. an outlet fitting; 1001. a transfer cavity; 1002. a ring cavity; 1003. sealing the device cavity.

Detailed Description

The vane pump comprises a pump housing 101, a shaft 102, a rotor 103, vanes 104, an extrusion port plate 105, a suction port plate 106, an inlet fitting 107 and an outlet fitting 108. Wherein a stator structure is disposed in the pump housing 101, a rotating shaft 102 is rotatably mounted on the pump housing 101 eccentrically with respect to the stator, and a rotor 103 is mounted on the rotating shaft, and when the rotating shaft 102 is in transmission connection with a corresponding driving device (such as a motor) for rotation, the rotor 103 is driven to rotate. The rotor 103 is provided with vane grooves 31 on its outer peripheral surface, the number of vane grooves 31 corresponds to the number of vanes 104 one by one, and the vanes 104 are each mounted in the corresponding vane groove and are reciprocally slidable therein. Therefore, when the rotor 103 rotates, the distance between the outer peripheral surface of the rotor and the inner wall of the stator is continuously changed, the blades 104 automatically adapt to the change under the action of centrifugal force, the outer ends of the blades are closely attached to the inner wall surface of the stator, and naturally, the volume of a space surrounded by the adjacent blades 104, the rotor 103 and the stator is periodically changed, so that the suction and discharge effects on liquid are realized.

An extruded port plate 105 is provided at one end of the rotor near the pump outlet in sliding sealing engagement with the rotor 103 and the vanes 104, and a suction port plate 106 is provided at the other end of the rotor in sliding sealing engagement with the other ends of the rotor and the vanes. An inlet fitting 107 is provided at the inlet of the pump housing 101 for connection to a liquid supply line for the liquid to be pumped, and an outlet fitting 108 is provided at the outlet of the pump housing for connection to a liquid discharge line for the liquid to be pumped. The above is a typical structure of a vane pump.

At the position where the rotation shaft 102 rotates relative to the pump casing 101, a certain amount of heat is generated due to friction and the like, and if the heat cannot be treated in time, the temperature of the corresponding position is raised, so that not only is the deterioration of the conveyed medium caused, but also the failure of the sealing part at the corresponding position is caused, and the occurrence of faults such as leakage of the vane pump is caused. The utility model provides a technical scheme based on the basic concept of circulating the high-pressure medium at the outlet of the vane pump at the rotating fit position of the rotating shaft and the pump shell and returning to the inlet of the pump.

The technical scheme of the vane pump of the present utility model will be described in detail below by way of example with reference to the accompanying drawings.

As shown in fig. 1, in some embodiments, the pump housing 101 includes a central barrel 11 and an outlet end cap 12 at one end of the barrel near the pump housing outlet and an inlet end cap 13 at the other end of the barrel. As shown in fig. 1, the cylinder 11 simultaneously forms the stator of the vane pump. The outlet end cap 12 is structured as shown in fig. 2-3, and is provided with a flange at the edge thereof for fixing and detachably connecting with the cylinder 11 by bolts. An outlet kidney-shaped aperture 121 is provided in the outlet end cap 12, the outlet kidney-shaped aperture 121 being adapted to enable high pressure medium to exit the pump housing. The outlet end cap 12 is further provided with a bearing mounting groove, and an outlet end bearing 123 for cooperation with the rotary shaft is mounted through the bearing mounting groove, where the bearing is a sliding bearing. At the bottom of the bearing mounting groove, the outlet end cap is further provided with a recess 122.

As shown in fig. 4-5, the inlet end cap 13 is also provided with a flange for releasable and secure connection with the barrel 11 by bolts. The inlet end cap 13 is a transparent cover with inlet kidney-shaped holes 131 for the liquid to be pumped into the stator and with a mouthpiece 132 for connection to the inlet fitting 107. In the embodiment shown in fig. 4-5, the central bore in the inlet end cap 13 is a stepped bore, with a smaller section being adjacent the corresponding end of the barrel, wherein an inlet end bearing 134 is provided, the inlet end bearing 134 also being a sliding bearing here. It will be appreciated by those skilled in the art that either the outlet end bearing 123 described above, or the inlet end bearing 134 herein, may be replaced by ball bearings or the like, which would not cause other corresponding structural changes. The inner wall of the inlet end bearing 134 is provided with a spiral groove 135, and the spiral groove 135 allows the cooling medium to smoothly pass through.

A communication port 133 is provided in a larger section of the inner hole of the inlet end cap 13, the communication port 133 being used for the backflow of the cooling medium, and the specific function of the communication port 133 will be described in detail below in connection with the working principle thereof, which is not described in detail herein. In addition, a sealing device cavity 1003 is defined between the larger hole section of the inlet end cover 13 and the outer end cover, and a mechanical seal composed of a spring 15, a buffer pad 16, a compression ring 17, a compression ring 18 and a ring cover 19 is arranged in the sealing device cavity to seal the liquid in the vane pump and prevent the liquid from leaking out from between the rotating shaft 102 and the end cover 14, and the structure and the working principle of the mechanical seal are the prior art and are not repeated here;

as shown in fig. 6 to 9, in the present utility model, the rotor 103 and the rotating shaft 102 are integrally constructed, and the rotating shaft 102 is a stepped shaft. For the rotation fit with the pump housing 101, a first rotation portion 21, a second rotation portion 22, and a third rotation portion 23 are provided on the rotation shaft 102, respectively. The first rotary part 21 is located at one end of the rotor near the pump housing outlet, and the second and third rotary parts 22, 23 are located at the other end of the rotor. After the shaft is installed, a transfer cavity 1001 is defined between the end of the first rotating part 22, which is close to the extrusion port plate 105, and the inner wall surface of the outlet end cover, and a ring groove is formed on the shaft 102 at the end of the second rotating part, which is close to the first rotating part, so that a ring cavity 1002 is formed at the end of the inlet end bearing.

The first rotating portion 21 is adapted to cooperate with the outlet end bearing 123, the second rotating portion 22 is adapted to cooperate with the inlet end bearing 134, and the third rotating portion 23 is adapted to be in rotational engagement with the outer end cap 14 provided at the corresponding end of the pump housing. The shaft 102 is further provided with a through hole 24, the through hole 24 is divided into an axial through hole and a radial through hole, the radial through hole is communicated with the axial through hole, the outer end of the radial through hole is led into the annular cavity 1002, and the other end of the axial through hole is led into the transfer cavity 1001.

In some embodiments, the vane grooves 31 on the rotor 103 are uniformly distributed around the circumference and have an even number, and each vane groove 31 is arranged back to back, two opposite vane grooves 31 are connected by a slide bar hole 33, and different slide bar holes 33 are staggered in the axial direction of the rotor and are not communicated with each other. The rotor is made of stainless steel, and can meet the requirement of low-viscosity corrosive media.

The outer end surface of the blade 104 is a cambered surface, the inner end surface is a plane, and both side surfaces in the circumferential direction of the rotor are respectively in sealing fit with the groove walls of the corresponding blade grooves, and in the embodiment shown in fig. 6-9, the outer circumferential surface of the rotor 103 is provided with pressure equalizing holes 32, and the pressure equalizing holes 32 lead to the space between the groove bottoms of the blade grooves 31 and the inner end surfaces of the blades. The high-pressure medium in the high-pressure area in the stator is led to the inner end of the corresponding blade to drive the outer end to reliably contact with the inner wall of the stator.

The seal slide bar 34 is installed in the slide bar hole 32, and the seal slide bar 34 is actually a push rod, and can move under the action of hydraulic pressure by being in sealing fit with the hole wall of the slide bar hole 32, and push the blade 104 at the corresponding end (low-pressure end) so that the blade can be reliably contacted with the inner wall surface of the stator. Specifically, when the rotor is in a high-pressure region, the pressure equalizing hole 32 arranged on the rotor introduces a high-pressure medium into the inner end of the blade and acts on the sealing slide rod 34, the length of the sealing slide rod is larger than that of the corresponding slide rod hole, the cross section of the sealing slide rod is smaller than that of the blade groove where the sealing slide rod is arranged, and the sealing slide rod penetrates through the sliding rod hole to meet the sealing requirement of the sealing slide rod and the hole where the sealing slide rod is arranged, so that the sealing slide rod at the high-pressure end slides towards the low-pressure end under the action of hydraulic pressure, the blade at the low-pressure end is pressed on the inner wall surface of the stator, the blade at the low-pressure end is reliably contacted with the inner wall surface of the stator, and the blade is prevented from falling off. The length of the seal slide bar 34 is 0.03-0.05 mm shorter than the minimum distance between two blades, and the clearance between the blades and the inner wall of the stator is ensured to be controllable under extreme conditions.

The seal slide bar 34 is a circular bar and is in clearance fit with the corresponding slide bar hole 32, so that a good sealing function can be realized through the clearance fit, and the seal slide bar 34 flexibly moves in the corresponding slide bar hole 32. The stay bar can be made of self-lubricating materials such as polyether ether ketone, ceramic, graphite or rubber, and is suitable for being used in low-viscosity corrosive media (such as sea fresh water, cooling liquid, perfluorinated hexanone, and the like).

As shown in fig. 9-11, in addition to the extrusion port plate 105's inherent extrusion port window 51, extrusion plate lubrication groove 52, the extrusion port plate 105's side facing away from the rotor is provided with cooling channels 53, which cooling channels 53 are in particular formed by grooves in the extrusion port plate's surface, although in some embodiments the grooves may be replaced by openings, which need only be capable of communicating the extrusion port window with the first rotating part. In addition, the extrusion port plate adopts a composite structure, which comprises an extrusion plate base body made of stainless steel and an extrusion plate wear-resistant layer 55 made of self-lubricating materials such as polyether ether ketone, ceramic, graphite or rubber and the like which are coated on the outer surface of the extrusion plate base body 54, so that the extrusion port plate 105 has good rigidity and tribological characteristics.

As shown in fig. 12-14, the suction port plate 106 is provided with a suction port window 61 and a suction plate lubrication groove 62. Similar to the extruded port plate, the intake port plate also employs a composite structure that includes an intake plate base 63 and an intake plate cover 64.

As shown in fig. 1, the outlet fitting 108 is fixedly connected to the pump housing 101 by a flange, and is an axial fitting. The inlet fitting 107 is connected to the intake port plate 106 and is a radial fitting. The connectors themselves are of prior art and will not be described in detail herein with respect to the outlet connector and inlet structure.

The cooling principle of the vane pump during operation is as follows: as shown in fig. 1, the high-pressure medium at the outlet of the vane pump enters the transfer chamber 1001 through the cooling passage pressed out of the port plate 105, the gap formed by the outlet end bearing 123 and the first rotating portion, and lubricates (when the medium is a lubricating medium) and cools the outlet end bearing 123. The high pressure medium then enters the annular cavity 1002 through the through holes 24 (axial through holes and radial through holes) in the shaft 102, and then enters the seal device cavity 1003 through the spiral groove 135 on the inlet end bearing 134, thereby lubricating and cooling the inlet end bearing 134 and the seal device. Under the influence of negative pressure formed by the pump suction, the medium in the sealing device accommodating chamber 1003 is sucked into the pump through the communication hole 133, and circulation of the high-pressure medium is completed, namely, the through hole 24, the annular chamber 1002, the gap between the inlet end bearing 134 and the rotating shaft 102, the sealing device accommodating chamber 1003 and the communication hole 133 together form a circulation passage, and by flowing the medium in the circulation passage, the critical friction part of the flow can be cooled and lubricated.

Claims

1. The vane pump comprises a pump shell, wherein a stator, a rotor, a suction valve plate and an extrusion valve plate are arranged in the pump shell, the rotor is positioned in the stator and is in running fit with the pump shell through a rotating shaft, and the rotating shaft is in running fit with the pump shell through a first rotating part close to the extrusion valve plate and a second rotating part close to the suction valve plate.

2. A vane pump as claimed in claim 1, wherein the circulation passage includes a through hole provided in the rotary shaft, the through hole having an outlet located on a side of the second rotary portion facing away from the pump housing inlet.

3. A vane pump as claimed in claim 2, wherein an annular chamber is provided between the shaft and the inner wall of the pump housing at the outlet.

4. The vane pump of claim 1 wherein said cooling flow path is defined by flow channels provided in a surface of said extruded port plate.

5. A vane pump as claimed in claim 1 or 2 or 3 or 4, wherein a transfer chamber is provided between an end of the rotary shaft adjacent to the first rotary part thereof and an inner wall of the pump casing, and an inlet of the circulation passage is located in the transfer chamber.

6. The vane pump of claim 5 wherein the transfer chamber is located between an end face of the shaft and an inner wall of the pump housing.

7. A vane pump as claimed in claim 1 or 2 or 3 or 4, wherein bearings are provided on the pump housing at the first and/or second turning parts.

8. A vane pump as claimed in claim 7, wherein the bearing is provided at the second rotary part, the bearing being a slide bearing, and a spiral liquid discharge groove is provided on an inner wall of the slide bearing.

9. A vane pump as claimed in claim 1, 2, 3 or 4, wherein the shaft further has a third rotating part in rotary sealing engagement with the pump casing, the third rotating part being located on a side of the second rotating part facing away from the first rotating part, a sealing device receptacle being provided between the second rotating part and the third rotating part, the sealing device receptacle being in communication with the pump casing inlet and forming part of the circulation passage.

10. A vane pump as claimed in claim 1 or 2 or 3 or 4, wherein the pump housing inlet is provided on a radial side of the pump housing.