CN113236519A

CN113236519A - Through-shaft axial swash plate plunger pump

Info

Publication number: CN113236519A
Application number: CN202110408526.3A
Authority: CN
Inventors: 赵宇峰
Original assignee: Wuxi Kairuide Fluid Technology Co ltd
Current assignee: Wuxi Kairuide Fluid Technology Co ltd
Priority date: 2021-04-16
Filing date: 2021-04-16
Publication date: 2021-08-10

Abstract

The invention provides a through-shaft axial swash plate plunger pump which comprises a shell, wherein an end cover is arranged at the left end of the shell, a tail cover is arranged at the right end of the shell, a cylinder body is arranged in the shell, and a rotating shaft is arranged on the left end surface of the cylinder body; a swash plate is arranged on the left side of the cylinder body in the shell and sleeved on the rotating shaft; a support shaft is arranged on the right end face of the cylinder body; a front bearing is arranged in the swash plate and sleeved on the rotating shaft; and a rear bearing is arranged in the tail cover and sleeved on the supporting shaft. This plunger pump's structure can effectual improvement atress condition, and the cylinder body is little in the rotation drunkenness volume to make plunger pump have the advantage that operates steadily, low vibrations, low noise, long service life.

Description

Through-shaft axial swash plate plunger pump

Technical Field

The invention relates to the field of hydraulic pressure, in particular to a through-shaft axial swash plate plunger pump.

Background

The plunger pump is an important device of a hydraulic system, and realizes oil absorption and oil pressing by mainly depending on the reciprocating motion of a plunger in a cylinder body to change the volume of a sealed working cavity; the plunger pump in the prior art is generally supported by the bearing arranged between the cylinder body and the shell, and the plunger pump with the structure has the advantages that the gap of the middle bearing is large, the rotating body is easy to move during working, the operation is not stable, and accordingly large vibration and noise are generated.

Disclosure of Invention

The invention provides a through-shaft axial swash plate plunger pump to solve the technical problems that an existing plunger pump rotating body is easy to move and unstable in operation when working, so that large vibration and noise are generated.

The technical scheme adopted by the invention for solving the technical problems is as follows: a through-shaft axial swash plate plunger pump comprises a shell, wherein an end cover is arranged at the left end of the shell, a tail cover is arranged at the right end of the shell, a cylinder body is arranged in the shell, and a rotating shaft is arranged on the left end surface of the cylinder body; a swash plate is arranged on the left side of the cylinder body in the shell and sleeved on the rotating shaft; a support shaft is arranged on the right end face of the cylinder body; a front bearing is arranged in the swash plate and sleeved on the rotating shaft; and a rear bearing is arranged in the tail cover and sleeved on the supporting shaft.

Further: a return disc is correspondingly arranged on the swash plate, and a slipper is correspondingly arranged on the inner ring of the return disc; plungers which are parallel to each other are uniformly distributed in the cylinder body, and the tops of the plungers are hinged with the sliding shoes; the return disc is provided with a ball hole, and a ball hinge is arranged in the ball hole; a plurality of spring holes are formed in the cylinder body along the circumferential direction, and compression springs are placed in the spring holes; the compression spring can push the spherical hinge leftwards to enable the sliding shoes in the return disc to be tightly pressed, sealed and attached to the swash plate.

Further: the left side of the tail cover is provided with a valve plate in a matching mode, a floating plate is arranged between the cylinder body and the valve plate, and the compression spring can push the cylinder body rightwards so that the floating plate is attached to the valve plate in a sealing mode.

Further: the end cover is provided with a mounting hole, a detachable sealing cover is arranged in the mounting hole, and the sealing cover is sleeved on the rotating shaft.

Further: the tail cover is provided with a communicating cavity and an oil outlet cavity, the communicating cavity is connected with the oil outlet cavity through a conical hole, and one side of the oil outlet cavity, which is close to the conical hole, is provided with a one-way valve; the one-way valve comprises a valve core and a valve spring, and the valve spring can push the valve core to enable the valve core to be attached to the tapered hole in a sealing mode.

The through-shaft axial swash plate plunger pump has the advantages that the through-shaft axial swash plate plunger pump adopts two split bearings which are respectively sleeved on the rotating shaft and the supporting shaft, so that the stress condition can be effectively improved, compared with the structure in the prior art, the cylinder body has small moving amount in rotation and stable operation, the vibration and noise of the pump are greatly reduced, and the split bearings also have the advantages of good supporting performance and long service life; in addition, this patent adopts a plurality of compression spring to push away the ball pivot jointly for the tight laminating of piston shoes pressure in the return stroke dish is on the sloping cam plate, and this kind of structure makes the atress between piston shoes and the sloping cam plate more even, is difficult to produce the phenomenon that piston shoes topple.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic diagram of a through-shaft axial swash-plate plunger pump;

FIG. 2 is a schematic view of the structure of the shoe pushing against the swash plate;

fig. 3 is a schematic structural view of the sealing cover arranged on the end cover.

In the figure, 1, a shell, 2, an end cover, 3, a tail cover, 4, a swash plate, 5, a cylinder body, 7, a rotating shaft, 8, a supporting shaft, 9, a front bearing, 10, a rear bearing, 11, a return disc, 12, a sliding shoe, 13, a plunger, 14, a ball hinge, 15, a compression spring, 16, a port plate, 17, a floating disc, 18, a sealing cover, 19, a communication cavity, 20, oil outlet, 21, a valve core and 22 are used as valve springs.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the present invention.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.

As shown in fig. 1, the invention provides a through-shaft axial swash plate plunger pump, which comprises a housing 1, wherein an end cover 2 is arranged at the left end of the housing 1, a tail cover 3 is arranged at the right end of the housing 1, a cylinder body 5 is arranged in the housing 1, and a rotating shaft 7 is arranged on the left end surface of the cylinder body 5; a swash plate 4 is arranged on the left side of the cylinder body 5 in the shell 1, and the swash plate 4 is sleeved on the rotating shaft 7; a support shaft 8 is arranged on the right end face of the cylinder body 5; a front bearing 9 is arranged in the swash plate 4, and the front bearing 9 is sleeved on the rotating shaft 7; a rear bearing 10 is arranged in the tail cover 3, and the rear bearing 10 is sleeved on the support shaft 8.

This lead to axle axial sloping cam plate plunger pump is provided with axis of rotation 7 and back shaft 8, is provided with front bearing 9 between sloping cam plate 4 and axis of rotation 7, is provided with rear bearing 10 between tailcap 3 and back shaft 8, and this plunger pump's structure can effectual improvement atress condition, and the cylinder block 5 is little in rotatory drunkenness volume to the feasible plunger pump that has operates steadily, low vibrations, low noise, long service life's advantage.

The bearing in the prior art is generally arranged between the shell 1 and the cylinder body 5, the gap of the middle bearing in the structure is large, the rotation of the cylinder body 5 is easy to move, the operation is not stable, and therefore large vibration and noise can be generated, in addition, the bearing machining precision requirement of the structure is also high, the bearing carries large radial pressure between the cylinder body 5 and the shell 1, the abrasion to the bearing is also large, the phenomenon that the bearing is meshed with the cylinder body 5 and the shell 1 is caused, and the service life of the bearing is influenced. This lead to axle axial sloping cam plate plunger pump adopts two split type bearings, overlaps respectively and establishes on axis of rotation 7 and back shaft 8, can the effectual atress condition that improves, compares in prior art structure, and the drunkenness volume of cylinder body 5 in the rotation is little, operates steadily, and this split type bearing still has the advantage that support performance is good, long service life.

As shown in fig. 2, a return disc 11 is correspondingly arranged on the swash plate 4, and a slipper 12 is correspondingly arranged on the inner ring of the return disc 11; plungers 13 which are parallel to each other are uniformly distributed in the cylinder body 5, and the tops of the plungers 13 are hinged with the sliding shoes 12; a ball hole is formed in the return disc 11, and a ball hinge 14 is arranged in the ball hole; a plurality of spring holes are formed in the cylinder body 5 along the circumferential direction, and compression springs 15 are placed in the spring holes; the compression spring 15 can push the ball hinge 14 leftwards to press the sliding shoe 12 in the return disc 11 to be tightly sealed and attached on the swash plate 4.

In the prior art, only one spring pushes the spherical hinge 14 to enable the sliding shoe 12 to be tightly attached to the swash plate 4, so that the requirement on the elastic performance of the spring is high, the service life of the spring is greatly reduced, and the phenomenon that the sliding shoe 12 topples due to uneven stress is easily caused by only one spring. This patent adopts nine compression spring 15 equipartitions jointly to push away spherical hinge 14 to make the piston shoe 12 in the return stroke dish 11 compress tightly on sloping cam plate 4, this kind of structure makes the more balanced of atress between piston shoe 12 and the sloping cam plate 4, is difficult to produce the phenomenon of toppling, and replaces a spring with nine springs, has reduced the requirement to the elastic property of spring, has improved the life of plunger pump.

The left side of the tail cover 3 is provided with a valve plate 16 in a matching mode, a floating plate 17 is arranged between the cylinder body 5 and the valve plate 16, and the compression spring 15 can push the cylinder body 5 rightwards so that the floating plate 17 is attached to the valve plate 16 in a sealing mode.

When the pump works, the valve plate 16 is fixed, the floating plate 17 is sleeved on the plunger 13 and rotates along with the plunger 13 and the cylinder body 5, and when liquid at the outlet of the pump has pressure, the floating plate 17 is always pressed against the valve plate 16 by hydraulic pressure generated by area difference between the valve plate 16 and the floating plate 17, so that the sealing effect between the cylinder body 5 and the valve plate 16 is greatly improved. In addition, the port plate 16 can also push the cylinder block 5 at the same time, so that the slipper 12 pushes on the swash plate 4.

As shown in fig. 3, the end cap 2 is provided with a mounting hole, a detachable sealing cover 18 is arranged in the mounting hole, and the sealing cover 18 is sleeved on the rotating shaft 7; this patent compares in the setting of the only end cover 2 of the prior art pump body, has the advantage of easy access, the change of being convenient for.

A communicating cavity 19 and an oil outlet cavity 20 are arranged on the tail cover 3, the communicating cavity 19 is connected with the oil outlet cavity 20 through a conical hole, and a one-way valve is arranged on one side, close to the conical hole, in the oil outlet cavity 20; the check valve comprises a valve core 21 and a valve spring 22, wherein the valve spring 22 can push the valve core 21 to enable the valve core 21 to be in sealing fit with the tapered hole.

When the oil pump works, when the oil in the communicating cavity 19 reaches the set pressure of the one-way valve, the valve core 21 moves downwards to the oil outlet cavity 20, so that the communicating cavity 19 is communicated with the oil outlet cavity 20, and the oil in the pump can be discharged out of the pump through the communicating cavity 19 and the oil outlet cavity 20; when not working, the relief valve can prevent on the one hand that the fluid in the pump runs off, and on the other hand can prevent in the oil reflux pump in the system to cause the pump to pump empty, and lead to the damage of pump.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic representation of the term does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A through-shaft axial swash plate plunger pump comprises a shell (1), wherein an end cover (2) is arranged at the left end of the shell (1), a tail cover (3) is arranged at the right end of the shell (1), a cylinder body (5) is arranged in the shell (1), and a rotating shaft (7) is arranged on the left end face of the cylinder body (5); a swash plate (4) is arranged on the left side of the cylinder body (5) in the shell (1), and the swash plate (4) is sleeved on the rotating shaft (7); the method is characterized in that: a support shaft (8) is arranged on the right end face of the cylinder body (5); a front bearing (9) is arranged in the swash plate (4), and the front bearing (9) is sleeved on the rotating shaft (7); the rear bearing (10) is arranged in the tail cover (3), and the rear bearing (10) is sleeved on the supporting shaft (8).

2. The through-shaft, axial, swash-plate plunger pump of claim 1, wherein: a return disc (11) is correspondingly arranged on the swash plate (4), and a slipper (12) is correspondingly arranged on the inner ring of the return disc (11); plungers (13) which are parallel to each other are uniformly distributed in the cylinder body (5), and the tops of the plungers (13) are hinged with the sliding shoes (12); a ball hole is formed in the return disc (11), and a ball hinge (14) is arranged in the ball hole;

a plurality of spring holes are formed in the cylinder body (5) along the circumferential direction, and compression springs (15) are placed in the spring holes; the compression spring (15) can push the spherical hinge (14) leftwards to enable the sliding shoes (12) in the return disc (11) to be tightly pressed and attached to the swash plate (4) in a sealing mode.

3. A through-shaft, axial swash-plate plunger pump as claimed in claim 2, wherein: the left side of the tail cover (3) is provided with a valve plate (16) in a matching mode, a floating plate (17) is arranged between the cylinder body (5) and the valve plate (16), and the compression spring (15) can push the cylinder body (5) rightwards to enable the floating plate (17) to be attached to the valve plate (16) in a sealing mode.

4. The through-shaft, axial, swash-plate plunger pump of claim 1, wherein: the end cover (2) is provided with a mounting hole, a detachable sealing cover (18) is arranged in the mounting hole, and the rotating shaft (7) is sleeved with the sealing cover (18).

5. The through-shaft, axial, swash-plate plunger pump of claim 1, wherein: a communicating cavity (19) and an oil outlet cavity (20) are arranged on the tail cover (3), the communicating cavity (19) is connected with the oil outlet cavity (20) through a conical hole, and a one-way valve is arranged on one side, close to the conical hole, in the oil outlet cavity (20); the check valve comprises a valve core (21) and a valve spring (22), wherein the valve spring (22) can push the valve core (21) to enable the valve core (21) to be attached to the tapered hole in a sealing mode.