CN111997858A

CN111997858A - Structure composition of variable plunger pump and control method thereof

Info

Publication number: CN111997858A
Application number: CN202010949518.5A
Authority: CN
Inventors: 蒋润
Original assignee: Wuhu Southwest Machinery Co ltd
Current assignee: Wuhu Southwest Machinery Co ltd
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2020-11-27

Abstract

The invention discloses a structure composition of a variable plunger pump and a control method thereof, wherein the structure composition comprises a rear pump body, a front pump body and a main shaft, a first variable shell is fixedly arranged at the rear end of the rear pump body, a variable shaft is movably arranged in the first variable shell, a variable spring is fixedly arranged at the top of the variable shaft, a second variable shell is fixedly arranged at the top of the first variable shell, an adjusting bolt is hinged to the inner thread of the second variable shell, and a spring adjusting rod is fixedly connected to the bottom of the adjusting bolt. The inclination angle of the swash plate can be adjusted by twisting the adjusting bolt, the adjusting bolt is twisted to drive the spring adjusting rod to move up and down, and the spring adjusting rod moves up and down to drive the variable spring seat to move up and down, so that the deformation of the variable spring is changed, the movement amplitude of the variable shaft is changed after the deformation of the variable spring is changed, the inclination angle of the swash plate is changed through the variable pin by the variable shaft, the adjustment is simple, the adjusting speed is high, and the adjustment is timely.

Description

Structure composition of variable plunger pump and control method thereof

Technical Field

The invention belongs to the technical field of plunger pumps, and particularly relates to a structural composition of a variable plunger pump and a control method thereof.

Background

The plunger pump is an important device of the hydraulic system. The plunger reciprocates in the cylinder body to change the volume of the sealed working cavity so as to absorb and press 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 with high pressure, large flow and flow needing regulation, such as hydraulic machines, engineering machinery and ships.

The variable of the existing swash plate type variable plunger pump changes the stroke of the plunger for controlling the angle of the swash plate, so that the variable is controlled, the swash plate type variable plunger pump is inconvenient to adjust the structure of the swash plate, the adjustment is not timely, and the occupied space of a spring for controlling the inclination angle of the swash plate in the shell is large, so that the size of the swash plate type variable plunger pump is large.

Disclosure of Invention

The invention aims to provide a structural composition of a variable plunger pump and a control method thereof, and aims to solve the problems that the prior variable plunger pump in the background art is inconvenient to adjust a swash plate structure and occupies a large space in a shell due to the fact that a spring for controlling the inclination angle of the swash plate is positioned in the shell, so that the adjustment is not timely and the volume of the swash plate type variable plunger pump is large.

In order to achieve the purpose, the invention provides the following technical scheme: a variable plunger pump comprises a rear pump body, a front pump body and a main shaft, wherein a first variable shell is fixedly mounted at the rear end of the rear pump body, a variable shaft is movably mounted inside the first variable shell, a variable spring is fixedly mounted at the top of the variable shaft, a second variable shell is fixedly mounted at the top of the first variable shell, an adjusting bolt is hinged to the inner thread of the second variable shell, the bottom of the adjusting bolt is fixedly connected with a spring adjusting rod, a variable spring seat is fixedly mounted at one end, away from the adjusting bolt, of the spring adjusting rod, a valve seat is fixedly mounted at the bottom of the first variable shell, a swash plate is movably mounted inside the first variable shell, a variable pin is movably mounted at one side of the swash plate, eight sliding shoes are fixedly mounted at the other side of the swash plate, a return stroke disc is movably mounted at the outer side of the sliding shoes, and a bearing is fixedly, the outer side of one end of the main shaft is meshed with a cylinder body, a valve plate is fixedly mounted on one side of the cylinder body, eight plunger sleeves are fixedly mounted inside the cylinder body, eight plungers are movably mounted inside the plunger sleeves, a valve body is movably mounted inside the plungers, a spring sleeve is fixedly mounted inside one end of the main shaft meshed with the cylinder body, a spring outer sleeve is sleeved inside one end, away from the main shaft, of the spring sleeve, and a control piston spring is sleeved inside the spring outer sleeve.

Preferably, the front pump body is fixedly installed at one end, far away from the first variable shell, of the rear pump body, the bearing is fixedly installed on the outer side of the main shaft, and an end cover is fixedly installed at one end, far away from the rear pump body, of the front pump body.

Preferably, the inside fixed mounting of back pump body has sealed outer loop, the inside fixed mounting of back pump body has interior pump body, the cylinder body is located the inside of interior pump body.

Preferably, an oil inlet and an oil outlet are formed in the front pump body, and the oil inlet and the oil outlet are communicated with the inside of the rear pump body.

Preferably, one end of the plunger is in a spherical shape, and the spherical end of the plunger is movably arranged in the slipper and the side far away from the swash plate.

Preferably, one end of the variable pin, which is far away from the swash plate, is movably arranged inside the variable shaft.

Preferably, the top of the second variable shell is movably provided with a head cap, and the adjusting bolt is positioned inside the head cap.

Preferably, the valve seat is internally provided with a drainage hole, and a hole plug is movably arranged in the drainage hole.

Preferably, the valve body comprises a valve housing and a valve core, the valve core being located inside the valve housing.

A control method of a variable displacement plunger pump comprises the following steps:

s1: the main shaft is rotated firstly, the main shaft drives the cylinder body to rotate, the cylinder body drives the plunger inside the cylinder body to rotate, under the action of the swash plate and the control piston spring, the movement amplitudes of the plungers at different positions of the cylinder body are different, so that the movement amplitudes of the valve body inside the cylinder body are different, and oil entering from the oil inlet is conveyed to the oil outlet to be discharged.

S2: when the variable is needed, the end socket cap at the top of the second variable shell is opened, and the adjusting bolt in the end socket cap is exposed.

S3: twist and move the adjusting bolt, the adjusting bolt drives the spring adjusting rod and reciprocates, the spring adjusting rod reciprocates and drives variable spring holder and reciprocate, thereby change variable spring's deformation volume, lead to the motion range change of variable axle after variable spring's deformation volume changes, thereby variable axle changes the inclination of sloping cam plate through the variable round pin, can change the motion range of plunger after the inclination of sloping cam plate changes, finally change the motion range of valve body in the inside of cylinder body, change the oil storage capacity of the inside of cylinder body, thereby change the oil output of cylinder body.

S4: and covering a head sealing cap at the top of the second variable shell.

Compared with the prior art, the invention has the beneficial effects that:

1. the inclination angle of the swash plate can be adjusted by twisting the adjusting bolt, the adjusting bolt is twisted to drive the spring adjusting rod to move up and down, and the spring adjusting rod moves up and down to drive the variable spring seat to move up and down, so that the deformation of the variable spring is changed, the movement amplitude of the variable shaft is changed after the deformation of the variable spring is changed, the inclination angle of the swash plate is changed through the variable pin by the variable shaft, the adjustment is simple, the adjusting speed is high, and the adjustment is timely.

2. Accomodate variable spring through setting up first variable shell and second variable shell, variable spring is located the inside of first variable shell, directly links to each other with variable axle and variable spring seat, only needs to move the adjusting bolt through twisting and can adjust variable spring's elongation, and compact structure does not have unnecessary structure, does not occupy the inner space of the pump body to reduce variable plunger pump's whole volume.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a front cross-sectional structural view of the present invention;

FIG. 3 is a schematic bottom sectional view of the present invention;

FIG. 4 is a schematic assembled perspective view of the present invention;

FIG. 5 is a schematic perspective view of a first variable shell according to the present invention;

FIG. 6 is a schematic diagram of a second variable shell according to the present invention;

FIG. 7 is a perspective view of the slipper of the present invention;

FIG. 8 is a schematic perspective view of a variable spring seat according to the present invention;

FIG. 9 is a schematic perspective view of a variable axis structure according to the present invention;

FIG. 10 is a schematic perspective view of a plunger according to the present invention;

fig. 11 is a schematic perspective structural view of the valve body according to the present invention.

In the figure: 1. a rear pump body; 2. a front pump body; 3. a main shaft; 4. an end cap; 5. an inner pump body; 6. a plunger sleeve; 7. a valve body; 701. a valve housing; 702. a valve core; 8. a plunger; 9. a slipper; 10. a first variable shell; 11. a variable axis; 12. a swash plate; 13. a return disk; 14. sealing the outer ring; 15. a spring housing; 16. a piston spring; 17. a spring housing; 18. a cylinder body; 19. a valve plate; 20. a bearing; 21. a variable pin; 22. a valve seat; 23. a drainage hole; 24. a variable spring; 25. a second variable shell; 26. a spring adjusting rod; 27. adjusting the bolt; 28. a head sealing cap; 29. a variable spring seat; 30. and (4) plugging the hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-11, the present invention provides a technical solution: a variable plunger pump comprises a rear pump body 1, a front pump body 2 and a main shaft 3, wherein a first variable shell 10 is fixedly installed at the rear end of the rear pump body 1, a variable shaft 11 is movably installed inside the first variable shell 10, a variable spring 24 is fixedly installed at the top of the variable shaft 11, a second variable shell 25 is fixedly installed at the top of the first variable shell 10, an adjusting bolt 27 is hinged to the inner thread of the second variable shell 25, a spring adjusting rod 26 is fixedly connected to the bottom of the adjusting bolt 27, a variable spring seat 29 is fixedly installed at one end, far away from the adjusting bolt 27, of the spring adjusting rod 26, a valve seat 22 is fixedly installed at the bottom of the first variable shell 10, a swash plate 12 is movably installed inside the first variable shell 10, a variable pin 21 is movably installed at one side of the swash plate 12, eight sliding shoes 9 are fixedly installed at the other side of the swash plate 12, a return plate 13 is movably installed at the outer side of, the outside meshing of main shaft 3 one end has cylinder body 18, one side fixed mounting of cylinder body 18 has valve plate 19, the inside fixed mounting of cylinder body 18 has eight plunger barrel 6, the equal movable mounting in inside of eight plunger barrel 6 has plunger 8, the inside activity of plunger 8 has valve body 7, the inside fixed mounting of main shaft 3 meshing cylinder body 18 one end has spring housing 17, spring housing 17 keeps away from the inside of main shaft 3 one end and has cup jointed spring housing 15, the inside of spring housing 15 has cup jointed control piston spring 16.

In this embodiment, by rotating the main shaft 3, the main shaft 3 drives the cylinder block 18 to rotate, the cylinder block 18 drives the plunger 8 therein to rotate, under the action of the swash plate 12 and the control piston spring 16, the movement amplitudes of the plungers 8 located at different positions of the cylinder block 18 are different, so that the movement amplitudes of the valve body 7 inside the cylinder block 18 are different, so as to transport the oil entering from the oil inlet to the oil outlet for discharge, when a variable is required, the head cap 28 at the top of the second variable housing 25 is opened, the adjusting bolt 27 inside the head cap 28 is exposed, the adjusting bolt 27 is screwed, the adjusting bolt 27 drives the spring adjusting rod 26 to move up and down, the spring adjusting rod 26 moves up and down to drive the variable spring seat 29 to move up and down, so as to change the deformation amount of the variable spring 24, the movement amplitude of the variable shaft 11 changes after the deformation amount of the variable spring 24 is changed, so that the variable shaft 11 changes the, when the inclination angle of the swash plate 12 is changed, the movement amplitude of the plunger 8 is changed, and finally the movement amplitude of the valve body 7 in the cylinder block 18 is changed, the oil storage amount in the cylinder block 18 is changed, so that the oil delivery amount of the cylinder block 18 is changed, and the sealing cap 28 at the top of the second variable shell 25 is covered.

Specifically, the front pump body 2 is fixedly installed at one end, away from the first variable housing 10, of the rear pump body 1, the bearing 20 is fixedly installed at the outer side of the main shaft 3, and the end cover 4 is fixedly installed at one end, away from the rear pump body 1, of the front pump body 2.

In this embodiment, the main shaft 3 is rotatable inside the bearing 20, and the bearing 20 serves to protect the main shaft 3.

Specifically, the sealing outer ring 14 is fixedly installed inside the rear pump body 1, the inner pump body 5 is fixedly installed inside the rear pump body 1, and the cylinder body 18 is located inside the inner pump body 5.

In this embodiment, the sealing outer ring 14 and the inner pump body 5 function to seal the inside of the pump body and prevent oil leakage.

Specifically, an oil inlet and an oil outlet are formed in the front pump body 2, and the oil inlet and the oil outlet are communicated with the inside of the rear pump body 1.

In this embodiment, the main shaft 3 is rotated, the main shaft 3 drives the cylinder block 18 to rotate, the cylinder block 18 drives the plunger 8 therein to rotate, and under the action of the swash plate 12, the movement amplitudes of the plungers 8 located at different positions of the cylinder block 18 are different, so that the movement amplitudes of the valve body 7 inside the cylinder block 18 are different, and oil entering from the oil inlet is conveyed to the oil outlet to be discharged.

Specifically, one end of the plunger 8 is in a spherical shape, and the spherical end of the plunger 8 is movably arranged in the slipper 9 and the side far away from the swash plate 12.

In this embodiment, the spherical end of the plunger 8 is slidable inside the shoe 9.

Specifically, one end of the variable pin 21, which is far away from the swash plate 12, is movably installed inside the variable shaft 11.

In this embodiment, the adjusting bolt 27 is screwed, the adjusting bolt 27 drives the spring adjusting rod 26 to move up and down, the spring adjusting rod 26 moves up and down to drive the variable spring seat 29 to move up and down, so as to change the deformation amount of the variable spring 24, and the change of the deformation amount of the variable spring 24 causes the change of the movement range of the variable shaft 11, so that the variable shaft 11 changes the inclination angle of the swash plate 12 through the variable pin 21.

Specifically, the top of the second variable shell 25 is movably provided with an end cap 28, and the adjusting bolt 27 is positioned inside the end cap 28.

In this embodiment, the cap 28 serves to protect the adjusting bolt 27.

Specifically, the valve seat 22 is provided with a drainage hole 23 therein, and a hole plug 30 is movably mounted in the drainage hole 23.

In this embodiment, the drainage hole 23 functions to drain oil leaking from the inside of the pump body.

Specifically, the valve body 7 includes a valve housing 701 and a valve core 702, and the valve core 702 is located inside the valve housing 701.

In this embodiment, valve housing 701 functions to protect valve core 702, and valve core 702 functions to deliver the product.

s1: firstly, a main shaft 3 is rotated, the main shaft 3 drives a cylinder block 18 to rotate, the cylinder block 18 drives a plunger 8 inside the cylinder block to rotate, under the action of a swash plate 12, the movement amplitudes of the plungers 8 at different positions of the cylinder block 18 are different, so that the movement amplitudes of a valve body 7 inside the cylinder block 18 are different, and the oil entering from an oil inlet is conveyed to an oil outlet to be discharged;

s2: when the variable is needed, the end socket cap 28 at the top of the second variable shell 25 is opened, and the adjusting bolt 27 in the end socket cap 28 is exposed;

s3: the adjusting bolt 27 is screwed, the adjusting bolt 27 drives the spring adjusting rod 26 to move up and down, the spring adjusting rod 26 moves up and down to drive the variable spring seat 29 to move up and down, so that the deformation amount of the variable spring 24 is changed, the movement amplitude of the variable shaft 11 is changed after the deformation amount of the variable spring 24 is changed, the inclination angle of the swash plate 12 of the variable shaft 11 is changed through the variable pin 21, the movement amplitude of the plunger 8 is changed after the inclination angle of the swash plate 12 is changed, the movement amplitude of the valve body 7 in the cylinder body 18 is finally changed, the oil storage amount in the cylinder body 18 is changed, and the oil transportation amount of the cylinder body 18;

s4: and a sealing cap 28 is covered on the top of the second variable shell 25.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a variable plunger pump, includes back pump body (1), preceding pump body (2) and main shaft (3), its characterized in that: the rear pump comprises a rear pump body (1), a first variable shell (10) is fixedly mounted at the rear end of the rear pump body, a variable shaft (11) is movably mounted inside the first variable shell (10), a variable spring (24) is fixedly mounted at the top of the variable shaft (11), a second variable shell (25) is fixedly mounted at the top of the first variable shell (10), an adjusting bolt (27) is hinged to the inner thread of the second variable shell (25), a spring adjusting rod (26) is fixedly connected to the bottom of the adjusting bolt (27), a variable spring seat (29) is fixedly mounted at one end, away from the adjusting bolt (27), of the spring adjusting rod (26), a valve seat (22) is fixedly mounted at the bottom of the first variable shell (10), a swash plate (12) is movably mounted inside the first variable shell (10), a variable pin (21) is movably mounted on one side of the swash plate (12), and eight sliding shoes (9) are fixedly mounted on the other side of the swash plate (, the outside movable mounting of piston shoe (9) has return stroke dish (13), the inside fixed mounting of preceding pump body (2) has bearing (20), the outside meshing of main shaft (3) one end has cylinder body (18), one side fixed mounting of cylinder body (18) has valve plate (19), the inside fixed mounting of cylinder body (18) has eight plunger bushing (6), eight the equal movable mounting in inside of plunger bushing (6) has plunger (8), the inside activity of plunger (8) has valve body (7), the inside fixed mounting of main shaft (3) meshing cylinder body (18) one end has spring housing (17), spring housing (17) have been cup jointed spring shell (15) in the inside that main shaft (3) one end was kept away from in spring housing (17), control piston spring (16) have been cup jointed in the inside of spring shell (15).

2. A variable displacement plunger pump as claimed in claim 1, wherein: preceding pump body (2) fixed mounting is kept away from the one end of first variable shell (10) at the rear pump body (1), bearing (20) fixed mounting is in the outside of main shaft (3), the one end fixed mounting that the rear pump body (1) was kept away from in preceding pump body (2) has end cover (4).

3. A variable displacement plunger pump as claimed in claim 1, wherein: the inside fixed mounting of back pump body (1) has sealed outer ring (14), the inside fixed mounting of back pump body (1) has interior pump body (5), cylinder body (18) are located the inside of interior pump body (5).

4. A variable displacement plunger pump as claimed in claim 1, wherein: an oil inlet and an oil outlet are formed in the front pump body (2), and the oil inlet and the oil outlet are communicated with the inside of the rear pump body (1).

5. A variable displacement plunger pump as claimed in claim 1, wherein: one end of the plunger (8) is in a spherical shape, and the spherical end of the plunger (8) is movably arranged in the slipper (9) and the side far away from the swash plate (12).

6. A variable displacement plunger pump as claimed in claim 1, wherein: one end of the variable pin (21) far away from the swash plate (12) is movably arranged in the variable shaft (11).

7. A variable displacement plunger pump as claimed in claim 1, wherein: an end cap (28) is movably mounted at the top of the second variable shell (25), and the adjusting bolt (27) is located inside the end cap (28).

8. A variable displacement plunger pump as claimed in claim 1, wherein: the drainage hole (23) has been seted up to the inside of disk seat (22), the inside movable mounting in drainage hole (23) has stopple (30).

9. A variable displacement plunger pump as claimed in claim 1, wherein: the valve body (7) comprises a valve housing (701) and a valve core (702), wherein the valve core (702) is positioned inside the valve housing (701).

10. A control method using a variable displacement plunger pump according to claims 1-9:

s1: firstly, a main shaft (3) is rotated, the main shaft (3) drives a cylinder block (18) to rotate, the cylinder block (18) drives a plunger (8) inside the cylinder block to rotate, and under the action of a swash plate (12) and a control piston spring (16), the movement amplitudes of the plungers (8) at different positions of the cylinder block (18) are different, so that the movement amplitudes of a valve body (7) inside the cylinder block (18) are different, and oil entering from an oil inlet is conveyed to an oil outlet to be discharged;

s2: when the variable is needed, the head cap (28) at the top of the second variable shell (25) is opened, and the adjusting bolt (27) in the head cap (28) is exposed;

s3: screwing an adjusting bolt (27), wherein the adjusting bolt (27) drives a spring adjusting rod (26) to move up and down, the spring adjusting rod (26) moves up and down to drive a variable spring seat (29) to move up and down, so that the deformation of a variable spring (24) is changed, the movement amplitude of a variable shaft (11) is changed after the deformation of the variable spring (24), the inclination angle of a swash plate (12) is changed through a variable pin (21) by the variable shaft (11), the movement amplitude of a plunger (8) can be changed after the inclination angle of the swash plate (12) is changed, the movement amplitude of a valve body (7) in a cylinder body (18) is finally changed, the oil storage capacity in the cylinder body (18) is changed, and the oil transportation capacity of the cylinder body (18) is changed;

s4: a head sealing cap (28) is covered on the top of the second variable shell (25).