CN114001005A

CN114001005A - Hydraulic plunger pump

Info

Publication number: CN114001005A
Application number: CN202111290424.2A
Authority: CN
Inventors: 李东林; 李聚波; 彭建军; 刘明伟; 王帅; 王军华; 李阁强; 徐莉萍; 张良
Original assignee: Henan University of Science and Technology
Current assignee: Henan University of Science and Technology
Priority date: 2021-11-02
Filing date: 2021-11-02
Publication date: 2022-02-01
Anticipated expiration: 2041-11-02
Also published as: CN114001005B

Abstract

The invention belongs to the technical field of hydraulic pumps, and particularly relates to a hydraulic plunger pump. The hydraulic plunger pump comprises a pump body, a cylinder body is rotatably assembled in the pump body through a sliding bearing, a plunger hole is formed in the cylinder body, a plunger is slidably assembled in the plunger hole, a floating disc and a flow distribution disc are sequentially arranged between the cylinder body and the pump body, a spring mounting groove is formed in the center of the cylinder body, and a spring used for pressing the floating disc against the flow distribution disc is arranged in the spring mounting groove; the inner chamber intercommunication of the spring mounting groove and the pump body is equipped with the outside cooling runner of intercommunication spring mounting groove and cylinder body in the plunger pump, the cooling runner flows through slide bearing, the cooling runner includes the through-flow hole of arranging along the radial extension of cylinder body, through-flow hole and spring mounting groove intercommunication to with the liquid of spring mounting inslot get rid of to slide bearing when the cylinder body rotates.

Description

Hydraulic plunger pump

Technical Field

The invention belongs to the technical field of hydraulic pumps, and particularly relates to a hydraulic plunger pump.

Background

The plunger type hydraulic pump has the outstanding advantages of good sealing performance, high working pressure, large power density ratio and the like, and is widely applied to high-end mobile equipment such as large airplanes and engineering machinery. The hydraulic plunger pump in the prior art generally comprises a pump body, wherein a pump inlet and a pump outlet are formed in the pump body, a cylinder body is assembled in the pump body through a sliding bearing, at least two plunger holes are arranged in the cylinder body at intervals along the circumferential direction, and plungers are assembled in the two plunger holes in a sliding mode. A flow distribution disc and a floating disc are arranged between the shell and the cylinder body in a pressing mode, a communication hole is formed in the floating disc, a through-flow sleeve is arranged between the floating disc and the cylinder body, and the through-flow sleeve is communicated with the plunger hole and the communication hole. Be provided with spring mounting groove in the cylinder body, spring mounting groove communicates with the inner chamber of casing. And a spring is arranged in the spring mounting groove and presses the floating disc against the valve plate. When the liquid pumping device is used, liquid pumping and liquid discharging are realized through the reciprocating movement of the plunger. This type is the chinese invention patent with application publication No. CN 111810374A.

The hydraulic plunger pump in the prior art has the problems that when the hydraulic plunger pump is used, the cylinder body continuously rotates in the pump body, although working liquid is filled in the pump body when the hydraulic plunger pump is used, the local heating at the sliding bearing is still serious, the service life of the sliding bearing is seriously shortened, and the normal rotation of the cylinder body is influenced.

Disclosure of Invention

The invention aims to provide a hydraulic plunger pump, which aims to solve the technical problem that the normal operation of the hydraulic plunger pump is influenced due to the serious local heating of a sliding bearing in the prior art.

In order to achieve the purpose, the technical scheme of the hydraulic plunger pump provided by the invention is as follows: a plunger pump comprises a pump body, wherein a cylinder body is rotatably assembled in the pump body through a sliding bearing, a plunger hole is formed in the cylinder body, a plunger is slidably assembled in the plunger hole, a floating disc and a flow distribution disc are sequentially arranged between the cylinder body and the pump body, a spring mounting groove is formed in the center of the cylinder body, and a spring used for pressing the floating disc against the flow distribution disc is arranged in the spring mounting groove; the inner chamber intercommunication of the spring mounting groove and the pump body is equipped with the outside cooling runner of intercommunication spring mounting groove and cylinder body in the plunger pump, the cooling runner flows through slide bearing, the cooling runner includes the through-flow hole of arranging along the radial extension of cylinder body, through-flow hole and spring mounting groove intercommunication to with the liquid of spring mounting inslot get rid of to slide bearing when the cylinder body rotates.

Has the advantages that: during the use, the cylinder body rotates the in-process, and the working solution in the spring mounting groove receives the centrifugal force effect and flows to the cylinder body outside through the discharge orifice, can take away slide bearing's heat at the flow in-process, has improved the flow velocity of slide bearing department working solution, prevents that slide bearing from being heated and damaging, prolongs hydraulic pressure plunger pump's life. And moreover, sundries at the sliding bearing can be taken away in the flowing process of the working fluid, so that the influence of the sundries on the normal rotation of the sliding bearing is avoided.

Preferably, the spring mounting groove is arranged opposite to the sliding bearing in the radial direction, the cooling flow channel comprises an annular channel arranged on the inner side of one end of the sliding bearing, and the annular channel is communicated with the through flow hole. Through setting up annular channel can make the direct impact slide bearing of working solution, improve the cooling effect to slide bearing.

Preferably, the pump body comprises an inclined shell and a straight shell which are connected, the cylinder body is rotatably assembled in the inclined shell, a pump end cover is arranged at the end part of the inclined shell, and the valve plate is fixedly arranged on the pump end cover;

and a limiting structure is arranged between the inclined shell and the cylinder body and is used for overcoming reverse elastic force applied to the cylinder body by the spring so as to limit the reverse movement limit of the cylinder body. The limiting structure can limit the axial position of the cylinder body, ensures that the floating disc and the valve plate are attached to each other, and avoids the situations of liquid leakage, eccentric wear and the like.

Preferably, the limiting structure comprises a thrust thread insert arranged outside the cylinder body;

the thrust thread insert is used for being matched with the sliding bearing fixedly arranged on the pump body in a blocking mode along the axial direction.

Preferably, the inclined shell is internally provided with a necking section, the sliding bearing is arranged on the necking section, the necking section is provided with a bearing shoulder facing the direction of the valve plate, and the periphery of the sliding bearing is provided with a flanging boss used for being in stop fit with the bearing shoulder. The sliding bearing can be reliably limited through the bearing shoulder and the flanging boss.

Preferably, a through flow groove is formed in one end face, facing the sliding bearing, of the thrust screw sleeve, and the through flow groove is communicated with the annular channel.

Preferably, the hydraulic plunger pump comprises a transmission shaft for driving a cylinder body to rotate, a driving bevel gear is arranged on the transmission shaft, and a driven bevel gear in meshing transmission with the driving bevel gear is arranged on the cylinder body;

the transmission shaft comprises a large-diameter section facing one side of the cylinder body and a small-diameter section facing away from one side of the cylinder body, and a support sliding sleeve matched with the large-diameter section of the transmission shaft to support the transmission shaft is arranged on the inner wall of the straight shell;

a sealing cover is fixed in the straight shell, and a bearing for supporting the transmission shaft is arranged between the sealing cover and the small-diameter section of the transmission shaft;

and a thrust bearing is arranged between the end part of one end of the sealing cover facing the cylinder body and the large-diameter section. The rotation of the transmission shaft can be reliably supported through the supporting sliding sleeve and the bearing, and the thrust bearing ensures that the transmission shaft can rotate relative to the sealing cover and can limit the axial movement of the transmission shaft.

Preferably, at least two thrust disks are arranged on the end face of one end, facing the sealing cover, of the transmission shaft at intervals along the circumferential direction, the thrust disks are matched with the thrust bearing, and a radial groove for communicating the inside and the outside of the thrust bearing is formed between any two adjacent thrust disks. During operation, the working fluid in the thrust bearing can flow through the radial groove under the action of centrifugal force to cool the thrust bearing, so that the situation that the thrust bearing is seriously heated and damaged is prevented.

Preferably, a through hole axially penetrating through the cylinder body is formed in the center of the cylinder body, the through hole comprises a large hole section close to the valve plate and a small hole section back to the valve plate, and the large hole section forms the spring mounting groove. The through hole is arranged so that the working fluid in the pump body can flow into the spring mounting groove conveniently.

Preferably, the through-flow holes are circumferentially equispaced.

Drawings

Fig. 1 is a schematic structural view of a hydraulic plunger pump provided in the present invention;

FIG. 2 is a schematic structural view of the propeller shaft of FIG. 1;

FIG. 3 is a schematic structural view of the cylinder body and the floating disc in FIG. 1;

FIG. 4 is a front view of the thrust nut of FIG. 3;

FIG. 5 is a right side view of the thrust nut of FIG. 3;

FIG. 6 is a front view of the cylinder block of FIG. 3;

FIG. 7 is a right side view of the cylinder block of FIG. 3;

description of reference numerals:

1. a clamp spring; 2. a rolling bearing; 3. mechanical sealing; 4. a thrust bearing; 5. supporting the sliding sleeve; 6. a sealing cover; 7. pressing a plate; 8. a cylinder body; 8-1, a through flow hole; 8-2, cylinder body shaft shoulder; 8-3, external thread section; 8-4, spring mounting grooves; 8-5, plunger holes; 8-6, driven bevel gear; 9. a sliding bearing; 9-1, flanging bosses; 9-2, annular channel; 10. a thrust thread insert; 10-1, a through-flow groove; 11. a tilt housing; 11-1, bearing shoulder; 12. a pump end cap; 13. a valve plate; 14. a floating disk; 14-1, a through-flow sleeve; 15. a spring; 16. a plunger; 17. a plunger connecting rod; 18. a drive shaft; 18-1, a thrust disc; 18-2, radial grooves; 18-3, a support section; 18-4, a drive bevel gear; 19. a spherical hinge seat; 20. a straight shell.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, which may be present, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, elements recited by the phrases "comprising an … …," or the like, do not exclude the presence of such elements, processes, or methods.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

The present invention will be described in further detail with reference to examples.

The invention provides a specific embodiment of a hydraulic plunger pump, which comprises the following components:

as shown in fig. 1 to 7, the hydraulic plunger pump includes a pump body, the pump body includes a pump end cover 12, an inclined casing 11, and a straight casing 20, which are sequentially arranged from left to right, and the pump end cover 12 and the straight casing 20 are both connected to the inclined casing 11 through screws. A port plate 13 is fixed to the right side of the pump end cover 12, and the port plate 13 is formed integrally with the pump end cover 12. A cylinder block 8 is rotatably fitted in the inclined housing 11, specifically, a sliding bearing 9 is mounted on the outside of the cylinder block 8, and the sliding bearing 9 is engaged with the outer peripheral surface of the cylinder block 8 to support the cylinder block 8 for rotation. A reducing section is arranged in the inclined shell 11, the sliding bearing is arranged on the reducing section, the reducing section is provided with a bearing shoulder 11-1 facing to the left, a flanging boss 9-1 is integrally formed on the periphery of the sliding bearing 9, and the flanging boss 9-1 is blocked with the bearing shoulder 11-1 from the left and the right to prevent the sliding bearing 9 from moving towards the right.

The thrust screw sleeve 10 is fixedly arranged outside the cylinder body 8, specifically, an external thread section 8-3 is arranged outside the cylinder body 8, the thrust screw sleeve 10 is assembled on the external thread section 8-3, a cylinder body shaft shoulder 8-2 facing to the left is arranged on the right side of the external thread section 8-3, and the thrust screw sleeve 10 is limited by the cylinder body shaft shoulder 8-2. The thrust nut 10 is screwed to the cylinder block 8, is formed integrally with the cylinder block 8, and is slidable rightward with the cylinder block 8, and when the thrust nut 10 is pressed against the sliding bearing 9, the cylinder block 8 is moved rightward to the limit position. In order to reliably mount the thrust nut 10 on the cylinder 8, a cylinder shoulder facing to the left is provided on the outer periphery of the cylinder 8, and a thrust nut shoulder is provided on the inner periphery of the thrust nut 10, so that the thrust nut 10 is limited by the stop fit between the cylinder shoulder and the thrust nut shoulder.

A spring installation groove 8-4 is formed in the center of the end face of the left end of the cylinder body 8, a spring 15 is embedded in the spring installation groove 8-4, and the spring 15 is a compressed spring. Specifically, an axially through hole is formed in the center of the cylinder body 8, the through hole comprises a large hole section at the left end and a small hole section at the right end, and the large hole section forms a spring mounting groove 8-4. In fact, the pump body is filled with working fluid, a floating disc 14 is arranged between the left end face of the cylinder body 8 and the valve plate 13, one end of the spring 15 is pressed against the bottom of the spring mounting groove 8-4, and the other end of the spring is pressed against the floating disc 14, so that the floating disc 14 and the valve plate 13 are reliably attached together. The spring 15 simultaneously applies a force to the cylinder 8 in the rightward direction, and the thrust nut 10 and the slide bearing 9 can receive the force in the rightward direction.

In order to realize liquid suction and liquid discharge, plunger holes 8-5 are uniformly distributed on the cylinder body 8 in the circumferential direction, the plunger holes 8-5 penetrate through the cylinder body 8, a plunger 16 is assembled in the plunger holes 8-5 in a sliding mode, a plunger connecting rod 17 is hinged to the right end of the plunger 16, and the plunger connecting rod 17 and the plunger 16 are in a ball hinge mode. The floating disc 14 is provided with communicating holes corresponding to the plunger holes 8-5, a through flow sleeve 14-1 is fixedly arranged in the communicating holes, the right end of the through flow sleeve 14-1 is inserted into the plunger hole 8-5 of the cylinder body 8 and is in sealing fit with the wall of the plunger hole 8-5, and the through flow sleeve 14-1 ensures that liquid flows among the plunger hole 8-5, the floating disc 14 and the valve plate 13.

In the hydraulic plunger pump, the reliable attachment of the floating disc 14 and the valve plate 13 is ensured through the spring 15, no liquid leakage is ensured, the limit of the rightward movement of the cylinder body 8 is limited through the thrust screw sleeve 10 and the sliding bearing 9, and the cylinder body 8 is reliably and stably supported through the sliding bearing 9.

In this embodiment, in order to cool the sliding bearing 9 and ensure the normal operation of the sliding bearing 9, a radially extending through hole 8-1 is formed in the cylinder block 8, and the through hole 8-1 is connected to the spring mounting groove 8-4 and extends to the outer circumferential surface of the cylinder block 8. As shown in fig. 4 and 5, a through flow groove 10-1 is formed in the right end face of the thrust nut 10, the through flow groove 10-1 radially penetrates through the thrust nut 10, after the thrust nut 10 is installed in place, a through flow hole 8-1 and the through flow groove 10-1 are communicated, specifically, the inner diameter of the left end of the sliding bearing 9 is smaller, an annular channel 9-2 is formed, and the through flow hole 8-1 is communicated with the through flow groove 10-1 through the annular channel 9-2. When the cylinder body 8 rotates, liquid in the cylinder body 8 flows to the outside of the cylinder body through the through hole 8-1 and the through groove 10-1 under the action of centrifugal force to cool the sliding bearing 9.

The hydraulic plunger pump further comprises a transmission shaft 18 positioned in the straight casing 20, the transmission shaft 18 plays a role of transmitting the rotary power to the cylinder body 8, the structure of the transmission shaft 18 is shown in fig. 1 and 2, and a driving bevel gear 18-4 is arranged at the left end (the left end in fig. 1 and the right end in fig. 2) of the transmission shaft 18, and the driving bevel gear can be specifically fixed in a split manner or integrally formed. The drive bevel gear 18-4 is adapted to engage with the driven bevel gear 8-6 so that the drive shaft 18 can rotate the cylinder block 8.

In order to drive each plunger piston to reciprocate, thereby completing the processes of imbibition and liquid discharge, a plurality of spherical hinge seats 19 are arranged at the left end of the transmission shaft 18, the number of the spherical hinge seats 19 is equal to that of the plunger pistons 16 on the cylinder body 8, the spherical hinge seats are uniformly distributed along the circumferential direction, and one end of the plunger piston connecting rod 17 is hinged with the corresponding spherical hinge seat 19. In order to prevent the spherical hinge seat 19 from falling off, a blind hole is formed in the left end face of the transmission shaft 18 to accommodate the spherical hinge seat 19, an annular pressing plate 7 is fixed to the left end face through screws, and the pressing plate 7 and each spherical hinge seat 19 are blocked left and right, so that anti-falling assembly is achieved.

In order to support the transmission shaft 18 so that the transmission shaft 18 can be stably rotated, as shown in fig. 1 and 2, a sealing cover 6 is fixedly mounted on a right end surface of the straight housing 20 by a screw, and a sealing ring is provided between the sealing cover 6 and an inner wall of the straight housing 20 to achieve sealing. The inner wall of the straight shell 20 is fixedly provided with a supporting sliding sleeve 5, the position of the transmission shaft 18 corresponding to the supporting sliding sleeve 5 is provided with a supporting section 18-3, and the supporting section 18-3 is matched with the supporting sliding sleeve 5 to ensure that the transmission shaft 18 can reliably perform circumferential rotation and axial movement. Meanwhile, a rolling bearing 2 is fixed on the inner wall of the right end of the sealing cover 6, and the right end of the transmission shaft 18 is rotatably assembled on the sealing cover 6 through the rolling bearing 2. In order to prevent the working fluid in the hydraulic plunger pump from leaking from the transmission shaft 18 side, a mechanical seal 3 is installed between the seal cover 6 and the transmission shaft 18, and the mechanical seal 3 is located on the left side of the rolling bearing 2. The clamp spring 1 is installed at one end of the transmission shaft 18, and the clamp spring 1 limits the rolling bearing 2 and prevents the rolling bearing 2 from being separated. In other embodiments, the type of bearing that mates with the drive shaft may be modified.

During the use, transmission shaft 18 can bear the effort of cylinder body 8 towards the right side, for retraining the axial displacement of transmission shaft 18, at the left end fixed mounting of sealed lid 6 have thrust bearing 4, thrust bearing 4's right-hand member has seted up the annular and clamps at the left end tip of sealed lid 6, and thrust bearing 4's left end terminal surface pastes the right-hand member at transmission shaft 18 for transmission shaft 18 can rotate for sealed lid 6, and sealed lid 6 also can move transmission shaft 18 right side simultaneously and retrain and restrict. As shown in fig. 2, a plurality of thrust disks 18-1 are fixed on the annular end surface of the transmission shaft 18 facing the seal cover 6, and are circumferentially spaced and uniformly distributed, and when the thrust disk assembly is used, the thrust disks 18-1 are matched with the thrust bearing 4. Any two adjacent thrust discs 18-1 are spaced from each other to form a radial groove 18-2, the radial groove 18-2 can be communicated with the inside and the outside of the thrust bearing 4, when in use, the sealing cover 6 is filled with working fluid, and the working fluid flows through the radial groove 18-2 under the action of centrifugal force, so that the thrust bearing 4 is cooled.

When the invention is used, the transmission shaft 18 rotates, the driving bevel gear 18-4 on the transmission shaft 18 is meshed with the driven bevel gear 8-6 on the cylinder body 8 to drive the cylinder body 8 to rotate, and the spherical hinge seat 19 fixed on the transmission shaft 18 drives the plunger 16 to reciprocate in the plunger hole 8-5 of the cylinder body 8 through the plunger connecting rod 17, so that a closed cavity formed by the plunger 16 and the plunger hole 8-5 is periodically changed. When the closed cavity is enlarged, working media (oil or water and the like) are sucked into the closed cavity through the valve plate 13 and the floating plate 14 to finish the suction process; when the closed cavity becomes smaller, the pressure of the working medium rises, and the working medium is discharged from the closed cavity through the port plate 13 and the floating plate 14, so that the discharging process is completed.

In this embodiment, the through-flow hole 8-1, the through-flow groove 10-1 and the annular passage 9-2 together form a cooling flow passage communicating the spring installation groove 8-4 and the outside of the cylinder block 8.

In this embodiment, the thrust screw sleeve 10 forms a limiting structure for limiting the cylinder 8, the thrust screw sleeve 10 is in stop fit with the sliding bearing 9 to achieve limiting, and meanwhile, the sliding bearing 9 is in stop fit with a bearing shoulder 11-1 in the inclined shell 11 through a flanging boss 9-1. In other embodiments, the flanging boss on the sliding bearing and the bearing shoulder on the inclined shell are eliminated, and the fixed assembly of the sliding bearing and the inclined shell is ensured by improving the machining precision. In other embodiments, the thrust nut is replaced by an annular baffle, and the annular baffle is directly matched with the lock neck section in the inclined shell in a blocking manner.

In this embodiment, a through-flow hole 8-1 is provided in the cylinder block 8, a through-flow groove 10-1 is provided in the end face of the thrust nut 10, and an annular passage 9-2 is provided in the interior of the sliding bearing 9. In other embodiments, the annular passage in the sleeve bearing is eliminated and the working fluid flows through one end of the sleeve bearing. In other embodiments, the through-flow groove in the thrust nut is eliminated when the thrust nut is in stop engagement with the neck section of the inclined housing. In other embodiments, when the hydraulic plunger pump adopts a background technology mode, namely a swash plate mode, a limit structure does not need to be arranged to overcome the counter force of the spring, and the limit structure can be cancelled.

In the embodiment, the outer diameter of the support section on the transmission shaft is larger to form a large-diameter section of the transmission shaft; and the outer diameter of the part of the transmission shaft, which is used for being matched with the rolling bearing, is smaller to form a small-diameter section of the transmission shaft. And the big footpath section that is provided with thrust bearing and transmission shaft on the sealed lid cooperates, sets up a plurality of thrust discs that circumference interval was arranged on the transmission shaft and cooperates with thrust bearing. In other embodiments, the thrust disk on the transmission shaft is eliminated, and the annular end surface of the large-diameter section of the transmission shaft is matched with the thrust bearing, so that the cooling effect of the thrust bearing is relatively poor. In other embodiments, when the hydraulic plunger pump is used in the manner of the background art, the straight housing and the sealing cover inside the straight housing may be eliminated.

In the embodiment, the through-flow holes 8-1 and the through-flow grooves 10-1 are uniformly distributed in the circumferential direction. In other embodiments, the number and arrangement of the through-flow holes and through-flow slots may vary.

In the embodiment, the through hole is formed in the center of the cylinder body, and the spring mounting groove is formed in the large hole section of the through hole. In other embodiments, the through-holes are replaced with blind holes to form spring mounting slots.

In this embodiment, the cylinder body shoulder is provided on the cylinder body, the thrust screw sleeve shoulder is provided on the thrust screw sleeve, and the stop fit is realized by the fit of the two shoulders. In other embodiments, both shoulders are eliminated.

Finally, although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments without departing from the inventive concept, or some of the technical features may be replaced with equivalents. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic plunger pump comprises a pump body, wherein a cylinder body (8) is rotatably assembled in the pump body through a sliding bearing (9), a plunger hole (8-5) is formed in the cylinder body (8), a plunger (16) is slidably assembled in the plunger hole (8-5), a floating disc (14) and a valve plate (13) are sequentially arranged between the cylinder body (8) and the pump body, a spring mounting groove (8-4) is formed in the center of the cylinder body (8), and a spring (15) used for pressing the floating disc (14) against the valve plate (13) is arranged in the spring mounting groove (8-4); the method is characterized in that: the spring mounting groove (8-4) is communicated with the inner cavity of the pump body, a cooling flow channel communicated with the spring mounting groove (8-4) and the outside of the cylinder body (8) is arranged in the hydraulic plunger pump, the cooling flow channel flows through the sliding bearing (9), the cooling flow channel comprises a through hole (8-1) arranged along the radial extension of the cylinder body (8), and the through hole (8-1) is communicated with the spring mounting groove (8-4) so as to throw liquid in the spring mounting groove (8-4) to the sliding bearing (9) when the cylinder body (8) rotates.

2. The hydraulic ram pump of claim 1, wherein: the spring installation groove (8-4) and the sliding bearing (9) are arranged in a facing mode in the radial direction, the cooling flow channel comprises an annular channel (9-2) arranged on the inner side of one end of the sliding bearing (9), and the annular channel (9-2) is communicated with the through flow hole (8-1).

3. The hydraulic ram pump of claim 1, wherein: the pump body comprises an inclined shell (11) and a straight shell (20) which are connected, the cylinder body (8) is rotatably assembled in the inclined shell (11), a pump end cover (12) is arranged at the end part of the inclined shell (11), and the valve plate (13) is fixedly arranged on the pump end cover (12);

be equipped with limit structure between oblique casing (11), cylinder body (8), limit structure is used for overcoming spring (15) is to the reverse elastic force that cylinder body (8) applyed to restrict cylinder body (8) reverse movement limit.

4. The hydraulic ram pump of claim 3, wherein: the limiting structure comprises a thrust thread insert (10) arranged outside the cylinder body (8);

the thrust thread insert (10) is used for being matched with the sliding bearing (9) fixedly arranged on the pump body in a blocking mode along the axial direction.

5. The hydraulic ram pump of claim 4, wherein: the inclined shell (11) is internally provided with a necking section, the sliding bearing (9) is installed on the necking section, the necking section is provided with a bearing shoulder (11-1) facing the direction of the valve plate (13), the periphery of the sliding bearing (9) is provided with a flanging boss (9-1), and the flanging boss (9-1) is used for being in stop fit with the bearing shoulder (11-1).

6. The hydraulic ram pump of claim 3, wherein: and a flow through groove (10-1) is formed in the end face, facing the sliding bearing (9), of the thrust thread insert (10), and the flow through groove (10-1) is communicated with the annular channel (9-2).

7. The hydraulic ram pump of claim 3, wherein: the hydraulic plunger pump comprises a transmission shaft (18) for driving a cylinder body (8) to rotate, a driving bevel gear (18-4) is arranged on the transmission shaft (18), and a driven bevel gear (8-6) which is in meshing transmission with the driving bevel gear (18-4) is arranged on the cylinder body (8);

the transmission shaft (18) comprises a large-diameter section facing one side of the cylinder body (8) and a small-diameter section facing away from one side of the cylinder body (8), and a supporting sliding sleeve (5) matched with the large-diameter section of the transmission shaft (18) to support the transmission shaft (18) is arranged on the inner wall of the straight shell (20);

a sealing cover (6) is further fixed in the straight shell (20), and a bearing for supporting the transmission shaft (18) is arranged between the sealing cover (6) and the small-diameter section of the transmission shaft (18);

and a thrust bearing (4) is arranged between the end part of one end of the sealing cover (6) facing the cylinder body (8) and the large-diameter section.

8. The hydraulic ram pump of claim 7, wherein: at least two thrust discs (18-1) are circumferentially arranged on the end face of one end of the transmission shaft (18) facing the sealing cover (6) at intervals, the thrust discs (18-1) are matched with the thrust bearing (4), and a radial groove (18-2) for communicating the inside and the outside of the thrust bearing (4) is formed between any two adjacent thrust discs (18-1).

9. The hydraulic ram pump of any one of claims 1-8, wherein: the center position of cylinder body (8) is equipped with the through-hole that axially runs through cylinder body (8), the through-hole includes the macropore section that is close to valve plate (13) and the aperture section of counter-flow valve plate (13), macropore section constitutes spring mounting groove (8-4).

10. The hydraulic ram pump of any one of claims 1-8, wherein: the through flow holes (8-1) are uniformly distributed along the circumferential direction.