CN116221055A

CN116221055A - Plunger pump

Info

Publication number: CN116221055A
Application number: CN202310005963.XA
Authority: CN
Inventors: 刘恩瑞; 梁宏喜; 余俊宏; 马瑞红; 张俊祥; 于昕海
Original assignee: Cssc Southwest Equipment Research Institute Co ltd
Current assignee: Cssc Southwest Equipment Research Institute Co ltd
Priority date: 2023-01-04
Filing date: 2023-01-04
Publication date: 2023-06-06

Abstract

The invention belongs to the technical field of plunger pumps, and particularly relates to a plunger pump, which comprises: valve piece, pump body and join in marriage the flow pump cover, the pump body sets up inside the valve piece, the pump body includes casing, transmission shaft, hydraulic fluid port screw cap, cylinder body, ration sloping cam plate, return disc, plunger piston shoe pair, bearing, return ball, spring and spring retainer plate, the inside cylinder body that sets up of casing, the inside transmission shaft that sets up of cylinder body, the casing left end sets up hydraulic fluid port screw cap, the transmission shaft right-hand member sets up the ration sloping cam plate, transmission shaft central authorities set up the return disc, the return disc left side sets up plunger piston shoe pair, plunger piston shoe pair right side sets up the return ball of being connected with the ration sloping cam plate, through adopting circular hole runner, has increased the area that overflows, has slowed down pressure impact and flow pulsation, effectually guaranteed the stationarity of fluid flow, when realizing two-way rotation, also guaranteed that has sufficient space enlarges the flow area.

Description

Plunger pump

Technical Field

The invention relates to the technical field of plunger pumps, in particular to a plunger pump.

Background

Plunger pumps are an important device of hydraulic systems. The plunger reciprocates in the cylinder body to change the volume of the sealed working cavity, so as to realize oil absorption and pressure oil. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, convenient flow regulation and the like, and is widely applied to occasions requiring high pressure, high flow and flow regulation.

A low shear rate plunger pump valve body and plunger pump is disclosed in patent number CN 202022201494.3. The plunger pump valve body and the plunger pump ensure the sealing effect on the medium, and simultaneously reduce the instantaneous speed of liquid flow in steering and the shearing effect on the polymer through the design of the cambered surface flow channel. The plunger pump valve body is of a butterfly structure and comprises a plunger pump valve body and a plunger pump valve spherical surface; the plunger pump valve main body is provided with a spring mounting protrusion, and the tail end of the plunger pump valve main body is provided with a spring positioning head; the spring mounting bulge is also provided with a spring clamping groove at one side of the tail end of the plunger pump valve main body.

When the plunger pump works, the quantity of the oil liquid passing channels is small, the passing area is affected, the pressure impact and the flow pulsation are high, and the flow stability of the oil liquid is affected.

Disclosure of Invention

This section is intended to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the invention, which should not be used to limit the scope of the invention.

The present invention has been made in view of the above and/or problems occurring in the prior art plunger pumps.

In order to solve the technical problems, according to one aspect of the present invention, the following technical solutions are provided:

a plunger pump, comprising:

a valve block;

the pump body is arranged in the valve block and comprises a shell, a transmission shaft, an oil port screw cover, a cylinder body, a quantitative sloping cam plate, a return disc, a plunger piston shoe pair, a needle bearing, a return ball, a spring and a spring positioning ring, wherein the cylinder body is arranged in the shell, the transmission shaft is arranged in the cylinder body, the oil port screw cover is arranged at the left end of the shell, the right end of the transmission shaft is provided with a quantitative sloping cam plate, the center of the transmission shaft is provided with a return disc, the left side of the return disc is provided with a plunger slipper pair, the right side of the plunger slipper pair is provided with a return ball connected with the quantitative sloping cam plate, the left end of the transmission shaft is provided with a needle bearing, the left side of the outside of the transmission shaft is provided with a spring, and the left side of the spring is provided with a spring positioning ring;

the flow distribution pump cover is arranged on the right side of the oil port screw cover, a plurality of side holes are formed in the circumferential side wall of the flow distribution pump cover, symmetrical waist holes are formed in the end face of the flow distribution pump cover, a plurality of round holes are formed in the waist holes on one side, and a plurality of small waist holes communicated with the side holes are formed in the waist holes on the other side.

As a preferable embodiment of the plunger pump according to the present invention, wherein: the valve block comprises a block body, a first oil port, an oil discharge port and a second oil port, wherein the left side of the top of the block body is provided with the first oil port, the right side of the top of the block body is provided with the oil discharge port, and the left end of the block body is provided with the second oil port.

As a preferable embodiment of the plunger pump according to the present invention, wherein: the transmission shaft is arranged in the center of the shell, and the left end of the transmission shaft is arranged on the flow distribution pump cover through a needle bearing.

As a preferable embodiment of the plunger pump according to the present invention, wherein: the right end of the transmission shaft is mounted on the shell through a ball bearing, and a rotary sealing piece is arranged on the left side of the ball bearing.

As a preferable embodiment of the plunger pump according to the present invention, wherein: the quantitative sloping cam plate is arranged on the transmission shaft in an inclined way.

As a preferable embodiment of the plunger pump according to the present invention, wherein: the round holes are uniformly distributed in the waist hole along the length direction of the waist hole and are connected with the flow distribution window of the cylinder body.

As a preferable embodiment of the plunger pump according to the present invention, wherein: the left end of the shell is communicated with the second oil port, and the top of the shell is communicated with the first oil port.

As a preferable embodiment of the plunger pump according to the present invention, wherein: the return ball is hinged with the right return disc in a spherical surface, the return disc is tightly pressed on the sliding shoe of the plunger sliding shoe pair, and the bottom of the sliding shoe is attached to the inclined surface of the quantitative sloping cam plate.

As a preferable embodiment of the plunger pump according to the present invention, wherein: the middle hole of the flow distribution pump cover is provided with a needle bearing serving as an installation seat of the transmission shaft.

As a preferable embodiment of the plunger pump according to the present invention, wherein: the right side of cylinder body is provided with the adjustment gasket, the thickness of adjustment gasket is adjustable.

Compared with the prior art, the method has the following beneficial effects: the invention can achieve the purpose of changing the displacement of the pump by changing the quantitative sloping cam plate with different inclination angles, and forms a series of displacement pumps with different specifications, two waist-shaped hole type flow distribution windows are arranged on the axial end face of the pump cover, a circular hole is arranged in one waist-shaped hole, the circular hole is connected with the cylinder body flow distribution window, a small waist-shaped hole is arranged in the other waist-shaped hole, the small waist-shaped hole is communicated with the side hole which is arranged in the radial direction of the flow distribution pump cover, thus an oil liquid inlet and outlet channel is formed, an oil liquid overflow channel is increased, the overflow area is increased by adopting the circular hole channel, the pressure impact and flow pulsation are slowed down, the stability of oil liquid flow is effectively ensured, and the expansion of the flow area is ensured while the bidirectional rotation is realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings, which are to be understood as merely some embodiments of the present invention, and from which other drawings can be obtained by those skilled in the art without inventive faculty. Wherein:

FIG. 1 is a schematic view of the axial side structure of a valve block according to the present invention;

FIG. 2 is a schematic view of the internal structure of the valve block of the present invention;

FIG. 3 is a schematic diagram of the pump body of the present invention;

FIG. 4 is a schematic view of the axial side structure of the cover of the flow distribution pump of the present invention;

FIG. 5 is a schematic side view of the distributing pump cover of the present invention;

fig. 6 is a schematic diagram of the front view of the flow distribution pump cover of the present invention.

The reference numerals in the drawings illustrate: 100 valve blocks, 110 blocks, 120 first oil ports, 130 oil discharge ports, 140 second oil ports, 200 pump bodies, 201 shells, 202 transmission shafts, 203 oil port screw covers, 204 cylinder bodies, 205 quantitative swash plates, 206 return plates, 207 plunger shoe pairs, 208 needle bearings, 209 return balls, 210 springs, 211 spring positioning rings, 212 bearings, 213 rotary seals, 300 distributing pump covers, 310 side holes, 320 waist holes, 330 round holes and 340 small waist holes.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.

Next, the present invention will be described in detail with reference to the drawings, wherein the sectional view of the device structure is not partially enlarged to general scale for the convenience of description, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

The present invention provides a plunger pump, referring to fig. 1-6, comprising: valve block 100, pump body 200, and metering pump cover 300.

The valve block 100 comprises a block 110, a first oil port 120, an oil discharge port 130 and a second oil port 140, wherein the first oil port 120 is formed in the left side of the top of the block 110, the oil discharge port 130 is formed in the right side of the top of the block 110, and the second oil port 140 is formed in the left end of the block 110.

As shown in fig. 3, the left side of the pump body 200 is provided with an oil port communicated with the second oil port 140, the top of the pump body 200 is provided with two oil ports, and the oil ports at the top of the pump body 200 are respectively communicated with the first oil port 120 and the oil discharge port 130, so that the circulation of oil between the valve block 100 and the pump body 200 is realized.

The pump body 200 is arranged in the valve block 100, the pump body 200 comprises a shell 201, a transmission shaft 202, an oil port screw cover 203, a cylinder 204, a quantitative swash plate 205, a return disc 206, a plunger piston shoe pair 207, a needle bearing 208, a return ball 209, a spring 210 and a spring positioning ring 211, the cylinder 204 is arranged in the shell 201, the transmission shaft 202 is arranged in the cylinder 204, the oil port screw cover 203 is arranged at the left end of the shell 201, the quantitative swash plate 205 is arranged at the right end of the transmission shaft 202, the return disc 206 is arranged at the center of the return disc 206, the plunger piston shoe pair 207 is arranged at the left end, the return ball 209 connected with the quantitative swash plate 205 is arranged at the right side of the plunger piston shoe pair 207, the needle bearing 208 is arranged at the left end of the transmission shaft 202, the spring 210 is arranged at the left side of the outside of the spring 210, the left end of the shell 201 is communicated with the second oil port 140, the top of the shell 201 is communicated with the first oil port 120, the bearing 212 connected with the cylinder 204 is arranged at the right end of the transmission shaft 202, and the rotary seal 213 is arranged at the right end of the transmission shaft 202 in contact with the bearing 212.

The return ball 209 is in spherical hinge joint with the return disc 206 on the right side, the return disc 206 is tightly pressed on the sliding shoe of the plunger sliding shoe pair 207, the bottom of the sliding shoe is attached to the inclined surface of the quantitative sloping cam plate 205, the appearance structure of the shell 201 adopts a plug-in hole design, an oil port is circumferentially arranged on the shell 201, the transmission shaft 202 is rotatably arranged in the shell 201, the quantitative sloping cam plate 205 is fixed on the shell 201, a plunger cavity is arranged on the circumference of the cylinder 204, one end of the plunger is hinged with the sliding shoe, and the other end of the plunger is slidably arranged in the plunger cavity; the plunger piston shoe pair 207 and the swash plate are propped against the plunger cavity position of the cylinder body 204 on the distributing pump cover 300 to be provided with two oil distributing windows, the distributing pump cover 300 is also provided with an oil collecting cavity which is communicated with one of the oil distributing windows, and the rear cover is radially provided with an annular groove which is communicated with the other oil distributing window; the oil port screw cover 203 is fixed on the pump shell and is provided with an axial oil port;

the distributing pump cover 300 is arranged on the right side of the oil port screw cover 203, three side holes 310 are formed in the circumferential side wall of the distributing pump cover 300, symmetrical waist holes 320 are formed in the end face of the distributing pump cover 300, round holes 330 with the same specification are formed in one side of the waist holes 320, three small waist holes 340 communicated with the side holes 310 are formed in the other side of the waist holes 320, the round holes 330 are uniformly distributed in the waist holes 320 along the length direction of the waist holes 320, and the round holes 330 are connected with distributing windows of the cylinder 204.

The pump shell 201 is provided with a shell oil port, the flow distribution pump cover 300 is provided with a radial oil port side hole 310, and the shell oil port is communicated with the radial oil port side hole 310 on the flow distribution pump cover 300; when rotating, the oil port of the shell 201 in the oil suction state is communicated with the radial oil port of the flow distribution pump cover 300 to suck oil, and the other part of the oil port of the shell 201 in the oil discharge state is communicated with the axial oil port through the rear cover oil collecting cavity, and when the rotating direction changes, the oil inlet and the oil outlet are exchanged.

The transmission shaft 202 is disposed at the center of the housing 201, the left end of the transmission shaft 202 is mounted on the flow-distribution pump cover 300 through a needle bearing, the right end of the transmission shaft 202 is mounted on the housing 300 through a ball bearing, and a rotary seal is disposed at the left side of the ball bearing.

The middle hole of the distributing pump cover 300 is provided with a needle bearing which is used as a mounting seat of the transmission shaft to keep stable connection of the structure.

The right side of the cylinder 206 is provided with an adjusting gasket, the thickness of which is adjustable, and the cylinder 206 is supported by the gasket.

When the oil suction type oil suction pump is specifically used, the oil port of the shell 201 in the oil suction state is communicated with the radial oil port of the flow distribution pump cover 300 to suck oil, the other part of the oil port of the shell 201 in the oil suction state is communicated with the axial oil port through the rear cover oil collecting cavity, when the rotation direction changes, the oil port is exchanged, the purpose of changing the displacement of the pump is achieved by exchanging the quantitative inclined plate 205 with different inclination angles, a series of displacement pumps with different specifications are formed, the circular hole 330 and the cylinder 204 are connected with the flow distribution window of the cylinder 204, the small waist-shaped hole 340 is communicated with the side hole 310 formed in the radial direction of the flow distribution pump cover 300, an oil inlet and outlet channel is formed, the oil flow channel is increased, the flow through hole flow channel is increased, the pressure impact and flow pulsation are slowed down, the stability of oil flow is effectively ensured, and the expansion of the flow through area is ensured when the bidirectional rotation is realized.

The quantitative swash plate with different inclination angles can be replaced to achieve the purpose of changing the displacement of the pump, a series of displacement pumps with different specifications are formed, two waist-shaped hole type flow distribution windows are formed in the axial end face of the pump cover, a circular hole is formed in one waist-shaped hole, the circular hole is connected with the cylinder body flow distribution window, a small waist-shaped hole is formed in the other waist-shaped hole, the small waist-shaped hole is communicated with a side hole formed in the radial direction of the flow distribution pump cover, an oil inlet and outlet channel is formed, an oil overflow channel is increased, the overflow area is increased by adopting a circular hole flow channel, pressure impact and flow pulsation are slowed down, the stability of oil flow is effectively guaranteed, and sufficient space is ensured to expand the flow area while bidirectional rotation is realized.

Although the invention has been described hereinabove with reference to embodiments, various modifications thereof may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the features of the disclosed embodiments may be combined with each other in any manner as long as there is no structural conflict, and the exhaustive description of these combinations is not given in this specification merely for the sake of omitting the descriptions and saving resources. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A plunger pump, comprising:

a valve block (100);

the pump body (200) is arranged inside the valve block (100), the pump body (200) comprises a shell (201), a transmission shaft (202), an oil port screw cover (203), a cylinder body (204), a quantitative swash plate (205), a return disc (206), a plunger piston shoe pair (207), a needle bearing (208), a return ball (209), a spring (210) and a spring positioning ring (211), the cylinder body (204) is arranged inside the shell (201), the transmission shaft (202) is arranged inside the cylinder body (204), the oil port screw cover (203) is arranged at the left end of the shell (201), the quantitative swash plate (205) is arranged at the right end of the transmission shaft (202), the return disc (206) is arranged at the center, the plunger piston shoe pair (207) is arranged at the left side, the return ball (209) connected with the quantitative swash plate (205) is arranged at the right side of the plunger piston shoe pair (207), the needle bearing (208) is arranged at the left end of the transmission shaft (202), the spring (210) is arranged at the left side outside the transmission shaft (202), and the spring positioning ring (211) is arranged at the left side of the spring (210);

the oil port screw cap (203) is arranged on the right side, a plurality of side holes (310) are formed in the circumferential side wall of the oil port screw cap (300), symmetrical waist holes (320) are formed in the end face of the oil port screw cap (300), a plurality of round holes (330) are formed in the waist holes (320) on one side, and a plurality of small waist holes (340) communicated with the side holes (310) are formed in the waist holes (320) on the other side.

2. The plunger pump according to claim 1, wherein the valve block (100) comprises a block body (110), a first oil port (120), an oil discharge port (130) and a second oil port (140), the first oil port (120) is formed in the left side of the top of the block body (110), the oil discharge port (130) is formed in the right side of the top of the block body (110), and the second oil port (140) is formed in the left end of the block body (110).

3. A plunger pump according to claim 1, characterized in that the drive shaft (202) is arranged in the centre of the housing (201), the left end of the drive shaft (202) being mounted on the fitting pump cover (300) by means of a needle bearing.

4. A plunger pump according to claim 3, characterized in that the right end of the drive shaft (202) is mounted on the housing (300) by means of a ball bearing, the left side of which is provided with a rotary seal.

5. A plunger pump according to claim 1, characterized in that the dosing swash plate (205) is arranged obliquely on the drive shaft (202).

6. The plunger pump according to claim 1, wherein a plurality of the circular holes (330) are uniformly distributed in the waist hole (320) along the length direction of the waist hole (320), and the circular holes (330) are connected with the flow distribution window of the cylinder body (204).

7. The plunger pump according to claim 2, wherein the left end of the housing (201) is in communication with the second port (140), and the top of the housing (201) is in communication with the first port (120).

8. A plunger pump according to claim 1, characterized in that the return ball (209) is spherically hinged with the return disc (206) on the right, the return disc (206) is pressed onto the shoe of the plunger shoe pair (207), the bottom of the shoe is attached to the inclined surface of the dosing swash plate (205).

9. A plunger pump according to claim 1, characterized in that the intermediate hole of the distributing pump cover (300) is provided with a needle bearing as a mounting seat for the drive shaft.

10. A plunger pump according to claim 1, characterized in that the right side of the cylinder (206) is provided with an adjusting shim, the thickness of which is adjustable.