Oblique shaft type piston pump

Abstract

The present application relates to the technical field of plunger pump structure design, and discloses a skew axis type plunger pump, which comprises a shell, a main shaft, a support disc, a mounting block, a distribution disc and a rear end cover; the distribution disc is provided with a high-pressure waist-shaped groove for discharging oil from a cylinder body; the rear end cover is provided with a high-pressure oil passage which is communicated with the high-pressure waist-shaped groove of the distribution disc; an installation groove is formed in an end face of the support disc close to the main shaft, and the installation groove is communicated with an oil passage; an oil channel is formed in the shell to communicate the high-pressure oil passage and the oil passage; the mounting block is mounted in the installation groove, and an oil groove and a through hole are formed in the bottom of the mounting block, so that oil enters the oil groove through the through hole to form an oil film. Through the above technical scheme, the force borne by the main shaft is offset, thereby reducing the stress of the main shaft, improving the compression force between the return disc and the main shaft disc, reducing leakage, avoiding the defects of insufficient installation space caused by using multiple bearings, effectively improving the service life of the bearings and preventing damage of the skew axis type plunger pump, and improving the service life of the pump.

Description

Technical Field

[0001] This invention relates to the field of plunger pump structural design, and more specifically to a slant-shaft plunger pump. Background Technology

[0002] Modern hydraulic pumps are used throughout the entire machinery industry. They have a variety of structures, with piston pumps being the most common. Piston pumps are divided into swashplate piston pumps and swashplate piston pumps. Swashplate piston pumps operate with a specific transmission sequence: the spindle drives the pistons, which in turn drive the cylinder block. Because there is an angle between the spindle and cylinder block axes, the suction and discharge of oil are achieved. The spindle does not pass through the cylinder block, allowing the cylinder block to be very small and experiencing minimal overturning moment. The cylinder block end face fits evenly with the distributor plate, resulting in low leakage and high volumetric efficiency. However, because the spindle of a swashplate piston pump is subjected to considerable axial and radial forces, this can easily lead to increased leakage between the return plate and the spindle plate. Summary of the Invention

[0003] The purpose of this invention is to provide a swashplate piston pump that can solve the problem of high leakage probability in the prior art.

[0004] To achieve the above objectives, the present invention provides a slant-shaft piston pump, comprising a housing, a main shaft, a support plate, a mounting block, a distribution plate, and a rear end cover; the main shaft is rotatably and sealingly disposed within the housing, driving the piston and cylinder to rotate; the housing is provided with a distribution plate for drawing and discharging oil from the cylinder, and the distribution plate is provided with a high-pressure waist-shaped groove for discharging oil from the cylinder; the rear end cover is fixedly disposed within the housing and has a high-pressure oil passage communicating with the high-pressure waist-shaped groove of the distribution plate; the support plate is coaxially fitted with the main shaft and fits tightly against the main shaft, and a mounting groove is provided on the end face of the support plate near the main shaft, the mounting groove communicating with an oil passage; an oil passage is provided on the housing communicating with the high-pressure oil passage and the oil passage; the mounting block is installed within the mounting groove, and an oil groove and a through hole are provided at the bottom of the mounting block, through which oil enters the oil groove to form an oil film.

[0005] Furthermore, the main shaft has a stepped periphery, the periphery of the support plate is adapted to the main shaft, and the mounting grooves are respectively provided on the axial surface and the circumferential surface of the support plate.

[0006] Furthermore, a sealing ring is installed on the mounting block.

[0007] Furthermore, the main shaft is connected to the housing via a rolling bearing, and its right end face is in contact with the rolling bearing.

[0008] Furthermore, the front cover is fixedly installed at the end of the housing away from the rear cover, and is passed through by the main shaft.

[0009] Further, one end of the plurality of plungers is ball-hinged on the main shaft, and the other end penetrates into the cylinder cavity to slide freely, and a certain angle is formed between the main shaft and the cylinder.

[0010] Further, when the cylinder rotates under the driving of the main shaft, the plungers gradually extend outward in the half circle of the rotation from bottom to top in the cylinder, the sealed working cavity volume of the cylinder is continuously increased, and the oil is sucked through the low-pressure waist-shaped groove of the distribution disc; when the plungers gradually retract in the cylinder in the half circle of the rotation from top to bottom, the sealed working cavity volume of the cylinder is continuously reduced, and the oil is discharged outward from the high-pressure waist-shaped groove of the distribution disc.

[0011] Further, the main shaft is provided with a main shaft disc near one end of the plunger, and a return disc is fixedly arranged on the main shaft disc to press the ball head part of the plunger on the main shaft disc.

[0012] The beneficial effects of the present application are:

[0013] (1) The present application introduces a support disc and a mounting block, and the oil in the high-pressure waist-shaped groove of the distribution disc is introduced into the oil groove on the mounting block through the oil path formed on the rear end cover and the shell, and a high-pressure oil film is formed between the main shaft and the mounting block, so as to offset the axial force and the radial force borne by the main shaft, thereby reducing the stress of the main shaft, improving the pressing force between the return disc and the main shaft disc, reducing the leakage, preventing the damage of the inclined shaft type plunger pump, and improving the service life of the pump.

[0014] (2) The present application avoids the defect of insufficient installation space caused by using multiple bearings, reduces the cost, and effectively reduces the stress of the bearing and improves the service life of the bearing.

[0015] (3) The present application ingeniously uses the high-pressure oil output by the inclined shaft type plunger pump to apply pressure to the main shaft without introducing external medium, and the structure is simple, ingenious and easy to operate. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of the present application;

[0017] Figure 2 is a structural schematic view of the support disc assembly of the present application;

[0018] Figure 3 is a structural schematic view of the mounting block assembly of the present application;

[0019] Figure 4 is a structural schematic view of the distribution disc assembly of the present application.

[0020] The reference signs in the drawings are as follows: shell 1, oil passage 1.1, front end cover 2, main shaft 3, main shaft disc 4, rolling bearing 5, support disc 6, mounting groove 6.1, oil passage 6.2, mounting block 7, oil groove 7.1, through hole 7.2, return disc 8, plunger 9, cylinder body 10, distribution disc 11, high-pressure waist-shaped groove 11.1, low-pressure waist-shaped groove 11.2, rear end cover 12, high-pressure oil passage 12.1, sealing ring 13. DETAILED DESCRIPTION

[0021] The specific embodiments of the present application are described in detail below. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0022] In the present application, the orientation words such as "upper" and "lower" generally refer to the orientation in the assembled and used state, unless otherwise stated. "Inner" and "outer" refer to the inner and outer relative to the outline of each component itself.

[0023] In order to solve the problems of large leakage probability and reduced bearing life in the prior art, the existing inclined shaft type plunger pump adopts multiple bearings to bear axial force and radial force, which not only occupies a large space, but also has high cost and poor effect. Figures 1-4 As shown in the drawings, the present application provides an inclined shaft type plunger pump, which comprises a shell 1, a main shaft 3, a support disc 6, a mounting block 7, a distribution disc 11, and a rear end cover 12. The main shaft 3 is rotatably and sealingly arranged in the shell 1 to drive the plunger 9 and the cylinder body 10 to rotate. The shell 1 is provided with the distribution disc 11 for sucking and discharging oil from the cylinder body 10, and the distribution disc 11 is provided with a high-pressure waist-shaped groove 11.1 for discharging oil from the cylinder body 10. The rear end cover 12 is fixedly arranged with the shell 1 and is provided with a high-pressure oil passage 12.1 in communication with the high-pressure waist-shaped groove 11.1 of the distribution disc 11. The support disc 6 is coaxially matched with the main shaft 3 and closely adheres to the main shaft 3. The mounting groove 6.1 is arranged on the end face of the support disc 6 close to the main shaft 3, and the oil passage 6.2 is communicated with the mounting groove 6.1. The oil passage 1.1 is arranged on the shell 1 to communicate the high-pressure oil passage 12.1 and the oil passage 6.2. The mounting block 7 is arranged in the mounting groove 6.1, and the oil groove 7.1 and the through hole 7.2 are arranged on the bottom of the mounting block 7. The oil enters the oil groove 7.2 through the through hole 7.2 to form an oil film

[0024] The main shaft 3 has a stepped structure around the circumference, the circumference of the support disc 6 is matched with the main shaft 3, and the mounting groove 6.1 is arranged on the axial face and the circumferential face of the support disc 6, respectively. Preferably, the support disc 6 closely adheres to the main shaft 3. It should be noted that only when the support disc 6 is fixedly connected with the shell 1, the oil passage 6.2 can be kept in communication with the high-pressure oil passage 12.1.

[0025] The high-pressure waist-shaped groove 11.1 of the distribution disc 11 is connected to the oil groove 7.1 on the mounting block 7 by introducing the support disc 6 and the mounting block 7 and opening the oil path on the rear end cover 12 and the shell 1, and a high-pressure oil film is formed between the main shaft 1.1 and the mounting block 7, which supports the main shaft by sliding hydrostatic pressure, so as to offset the axial force and radial force borne by the main shaft 1, thereby reducing the force borne by the main shaft 1, improving the compression force between the return disc 8 and the main shaft disc 4, reducing leakage, avoiding the defect of insufficient installation space caused by using multiple bearings, and effectively improving the bearing life and preventing damage to the inclined shaft type plunger pump, thereby improving the service life of the pump. It should be noted that the main shaft 3 is specially provided with an oil path and the support disc 6, which is convenient for processing and reduces the processing cost in the actual production process,

[0026] In order to realize the oil sealing between the mounting block 7 and the shell 1, the sealing ring 13 is installed on the mounting block 7 in the preferred case. Preferably, the mounting block 7 is provided with a notch near the circumference of the bottom of the mounting groove 6.1, and the sealing ring 13 is sleeved on the notch, so as to realize better sealing. More preferably, the depth of the mounting groove 6.1 is greater than the thickness of the mounting block 7, and the sealing ring 13 protrudes from the notch when it is installed on the mounting block 7. In the installed state, the total thickness of the sealing ring 13 and the mounting block 7 is greater than the depth of the mounting groove 6.1. Through the setting of the preferred technical solution, the gap between the mounting block 7 and the main shaft 3 can be automatically adjusted according to the high-pressure oil pressure generated by the high-pressure waist-shaped groove 11.1, the impact of the high-pressure oil is buffered, and the high-pressure oil film remains relatively stable.

[0027] The main shaft 3 is connected with the shell 1 through the rolling bearing 5, and the right end surface is in contact with the rolling bearing 5. The support disc 6 limits the position of the rolling bearing 5. A single rolling bearing 5 is used to connect the shell 1 and the main shaft, which occupies a small space and has low cost, and can bear axial force and radial force.

[0028] In order to limit the position of the main shaft 3 and the support disc 6, the front end cover 2 is fixedly installed on the shell 1 away from the rear end cover in the preferred case, and the main shaft 3 passes through it.

[0029] In order to enable the plunger 9 to be hinged with the main shaft under small friction and to be slidingly connected with the cylinder body 10, in the preferred case, a plurality of the plunger 9 is hingedly connected at one end to the main shaft 3 and freely slides into the cavity of the cylinder body 10 at the other end, and a certain angle is formed between the main shaft 3 and the cylinder body 10.

[0030] The specific working process of the above technical solution is as follows: when the cylinder body 10 rotates under the driving of the main shaft 3, the plunger 9 gradually extends outward in the cylinder body 10 in a half rotation from bottom to top, the sealed working cavity volume of the cylinder body 10 is continuously increased, and the oil is sucked through the low-pressure waist-shaped groove 11.2 of the distribution disc 11; when the plunger 9 gradually retracts in the cylinder body 10 in a half rotation from top to bottom, the sealed working cavity volume of the cylinder body 10 is continuously reduced, and the oil is discharged outward from the high-pressure waist-shaped groove 11.1 of the distribution disc 11. Through the above process, the oil suction and discharge action is realized.

[0031] In the prior art, in order to stably fix the plunger 9 on the main shaft 3, in a preferred case, the main shaft 3 is provided with a main shaft disc 4 near one end of the plunger 9, and a return disc 8 is fixedly arranged on the main shaft disc 4 to press the ball head part of the plunger 9 on the main shaft disc 4.

[0032] The specific working process of the present application is as follows: the main shaft 3 is driven to rotate by an external motor, the main shaft 3 drives the plunger 9, and the plunger 9 drives the cylinder body 10 to rotate. Since there is an angle between the main shaft 3 and the cylinder body 10, the oil suction and discharge action is completed during the rotation. After the high-pressure oil enters the high-pressure waist-shaped groove 11.1, it enters the bottom oil groove 7.1 of the mounting block 7 through the rear end cover 12, the shell 1 and the support disc 6, and an oil film is formed between the main shaft 3 and the support disc 6 to offset the axial force and radial force borne by the main shaft, thereby reducing the stress on the main shaft, improving the pressing force between the return disc and the main shaft disc, reducing leakage, avoiding the defects of insufficient installation space caused by using multiple bearings, effectively improving the service life of the bearings and preventing damage to the inclined shaft type plunger pump, and improving the service life of the pump.

[0033] The preferred embodiments of the present application are described in detail above, but the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, various simple modifications can be made to the technical solution of the present application, and these simple modifications all belong to the protection scope of the present application.

[0034] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again by the present application.

[0035] In addition, various different embodiments of the present application can also be combined in any manner, as long as they do not deviate from the idea of the present application, and they should also be considered as disclosed by the present application.

Claims

1. An oblique-axis piston pump characterized by, It comprises a shell (1), a main shaft (3), a support disc (6), a mounting block (7), a flow distribution disc (11) and a rear end cover (12). The main shaft (3) is rotatably and sealingly arranged in the shell (1), and the driving plunger (9) and the cylinder (10) are rotatable; the shell (1) is provided with the flow distribution disc (11) for sucking and discharging oil from the cylinder (10), and the flow distribution disc (11) is provided with the high-pressure waist-shaped groove (11.1) for discharging oil from the cylinder (10); the rear end cover (12) is fixedly arranged with the shell (1) and is provided with the high-pressure oil passage (12.1) communicated with the high-pressure waist-shaped groove (11.1) of the flow distribution disc (11); the support disc (6) is coaxially arranged with the main shaft (3) and closely adheres to the main shaft (3), and the end face of the support disc (6) close to the main shaft (3) is provided with the mounting groove (6.1), and the mounting groove (6.1) is communicated with the oil passage (6.2); the shell (1) is provided with the oil channel (1.1) communicated with the high-pressure oil passage (12.1) and the oil passage (6.2); the mounting block (7) is mounted in the mounting groove (6.1), and the bottom of the mounting block (7) is provided with the oil groove (7.1) and the through hole (7.2), and the oil enters the oil groove (7.1) through the through hole (7.2) to form an oil film. The main shaft (3) is provided with a stepped structure close to one end of the cylinder (10), the periphery of the support disc (6) is adapted to the end of the main shaft (3) close to the cylinder (10), and the mounting groove (6.1) is arranged on the axial face and the circumferential face of the support disc (6) respectively, and the mounting block (7) is arranged in each mounting groove (6.1).

2. The oblique-axis piston pump according to claim 1, characterized in that The mounting block (7) is provided with the sealing ring (13).

3. The oblique-axis piston pump of claim 1, wherein The main shaft (3) is connected with the shell (1) through the rolling bearing (5), and the right end face is adhered to the rolling bearing (5).

4. The oblique-axis piston pump of claim 1, wherein The front end cover (2) is fixedly mounted with the shell (1) away from the rear end cover, and is penetrated by the main shaft (3).

5. The oblique-axis piston pump of claim 1, wherein The plurality of plungers (9) are ball-hinged on the main shaft (3) at one end and are penetrated into the cavity of the cylinder (10) to freely slide at the other end, and a certain angle is formed between the main shaft (3) and the cylinder (10).

6. The oblique-axis piston pump of claim 5, wherein When the cylinder (10) rotates under the driving of the main shaft (3), the plunger (9) gradually extends outward in the half circle of the cylinder (10) from bottom to top, the volume of the sealed working cavity of the cylinder (10) is continuously increased, and the oil is sucked through the low-pressure waist-shaped groove (11.2) of the flow distribution disc (11); when the plunger (9) gradually retracts into the cylinder (10) in the half circle from top to bottom, the volume of the sealed working cavity of the cylinder (10) is continuously reduced, and the oil is discharged outward from the high-pressure waist-shaped groove (11.1) of the flow distribution disc (11).

7. The oblique-axis piston pump of claim 5, wherein The main shaft (3) is provided with the main shaft disc (4) close to one end of the plunger (9), and the main shaft disc (4) is fixedly provided with the return disc (8) for pressing the ball head part of the plunger (9) on the main shaft disc (4).

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