CN220134167U - Internal circulation pressure relief type plunger pump and oil pump comprising same - Google Patents

Abstract

The utility model discloses an internal circulation pressure relief type plunger pump and an oil pump comprising the same, wherein the internal circulation pressure relief type plunger pump comprises a shell, a plunger assembly and an oil distribution disc, a cavity is arranged in the shell, and an oil return hole communicated with the inside and the outside of the shell is arranged on the surface of the shell; the plunger component forms an oil cavity communicated with the oil return hole in the cavity; the oil distribution disc is arranged in the cavity and is positioned at the axial end part of the plunger assembly, an oil inlet hole and an oil outlet hole which are axially communicated are formed in the oil distribution disc, the oil distribution disc can slide back and forth along the axial direction of the shell, and when the oil distribution disc slides towards the inside of the shell, a circulation channel for communicating the oil inlet hole, the oil outlet hole and the oil return hole is formed between the oil distribution disc and a structure matched with the oil distribution disc. When the liquid outlet of oil pump is plugged up, the oil distribution disc slides to the shell inside and releases pressure, and fluid outside the shell and from inlet and oil gallery entering shell inside this moment, the oil outlet that follows the oil distribution disc through the plunger subassembly flows, and inlet and oil gallery flow in the shell again in, and the motor card has been avoided in so circulation.

Description

Internal circulation pressure relief type plunger pump and oil pump comprising same

Technical Field

The utility model relates to the technical field of automobile parts, in particular to an internal circulation pressure relief type plunger pump and an oil pump comprising the same.

Background

With the current full-scale development of the manufacturing industry, more and more places need to use plunger pumps. For example, a plunger pump is needed in an oil pump of an automobile brake oil way.

In order to form a complete structure, the conventional plunger pump needs to fix an oil distribution disc at one end of a shell during assembly, so that parts such as an internal cylinder body and the like are limited, and the whole plunger pump is sold or replaced. As japanese patent JP3725637B2, an axial plunger hydraulic pump is disclosed, which discloses a housing including a cylindrical housing body, a front housing closing an opening at one end side of the housing body, and a rear housing closing an opening at the other end side of the housing body. As another example, chinese patent CN212717030U discloses a full-water lubrication low-noise hydraulic axial plunger pump capable of running under negative pressure, wherein a rear end cover and a front end cover are respectively and fixedly installed at two ends of a casing, and a valve plate is installed on the rear end cover and located in the casing.

The above-mentioned fixed connected mode of oil distribution disc and shell has following problems: during normal operation, the plunger pump sucks oil from the inlet of the oil pump and beats out from the outlet, when the outlet channel of the oil pump is blocked, the internal plunger pump does not stop working at this moment, the pressure of the liquid outlet of the plunger pump rises rapidly, the oil pressure of the liquid outlet can be accumulated in the internal circulation of the plunger pump at this moment, the internal pressure of the plunger pump is gradually increased, and then the motor cannot normally rotate with the cylinder body, so that the problem of motor blocking finally occurs.

Disclosure of Invention

The utility model provides an internal circulation pressure relief type plunger pump and an oil pump comprising the same, and aims to solve the technical problems that in the prior art, when an outlet channel of the oil pump is blocked, the pressure in the plunger pump cannot be released, so that a motor cannot drive a cylinder body to rotate, and the motor is easy to clamp.

The utility model provides an internal circulation pressure relief type plunger pump which comprises a shell, a plunger assembly and an oil distribution disc, wherein a cavity is formed in the shell, and an oil return hole communicated with the inside and the outside of the shell is formed in the surface of the shell; the plunger assembly is arranged in the cavity, and an oil cavity communicated with the oil return hole is formed in the cavity; the oil distribution disc is arranged in the cavity and is positioned at the axial end part of the plunger assembly, an oil inlet hole and an oil outlet hole are formed in the oil distribution disc, the oil distribution disc slides back and forth along the axial direction of the shell through the plunger assembly, and when the oil distribution disc slides towards the inside of the shell, the oil distribution disc and a structure matched with the oil distribution disc form a circulation channel communicated with the oil inlet hole, the oil outlet hole and the oil return hole.

Further, the plunger assembly is provided with an oil through hole communicated with the oil cavity and the end face of the plunger assembly where the oil distribution disc is located, and the oil through hole is in butt joint with the oil inlet hole.

Further, the plunger assembly comprises a swash plate, a cylinder body and a plunger arranged between the swash plate and the cylinder body, the oil through hole is arranged in the cylinder body, an axially telescopic reset piece is arranged between the plunger and the cylinder body, an oil cavity is formed between the swash plate and the cylinder body, the cylinder body is arranged close to one end of the oil distribution disc, one end of the cylinder body, facing the swash plate, is provided with a plunger hole for inserting the plunger, a variable volume cavity is formed in the plunger hole, and the variable volume cavity is communicated with the end face of the cylinder body where the oil distribution disc is located, so that the variable volume cavity is alternately communicated with the oil inlet hole and the oil outlet hole.

Further, the plunger assembly further comprises an axially telescopic reset piece, and the reset piece is abutted in the plunger hole by the plunger.

Further, the outer peripheral surface of the oil distribution disc is provided with a limiting protrusion, and one axial end of the shell is provided with a limiting piece which is matched with the limiting protrusion to form one-way limiting.

Further, the limiting piece is a stamping protrusion which is located on the inner peripheral surface of the shell and matched with the end face of the limiting protrusion, and the stamping protrusion is formed by stamping the axial end face of the shell.

Further, the stamping protrusion is of an annular structure or a plurality of arc structures which are not connected with each other.

Further, a positioning protrusion is arranged on the outer circumferential surface of the oil distribution disc, and a positioning groove for the positioning protrusion to reciprocate is arranged on the inner circumferential surface of the shell.

Further, the cylinder body is provided with a butt joint hole extending from the variable volume cavity to one end of the cylinder body towards the oil distribution disc, the butt joint hole is alternately butt-jointed with the oil inlet hole and the oil outlet hole, and the oil through hole is communicated in the axial direction of the cylinder body.

Further, the reset piece is a reset spring.

The utility model also provides an oil pump which comprises a shell and the internal circulation pressure relief type plunger pump positioned in the shell, wherein when the oil distribution disc slides to the outside of the shell, the oil outlet is connected with the liquid outlet of the shell, and when the oil distribution disc slides to the inside of the shell, the oil outlet is separated from the liquid outlet of the shell.

The beneficial effects of the utility model are as follows:

(1) According to the utility model, when the liquid outlet of the oil pump is blocked, the internal pressure of the oil pump is increased, the oil distribution disc is pushed to slide towards the inside of the shell to release pressure, oil enters the inside of the shell through the liquid inlet and the oil return hole and flows out of the oil outlet of the oil distribution disc through the plunger assembly, and then the liquid inlet and the oil return hole flow into the shell again, so that the motor is prevented from being blocked in a circulating manner.

(2) In the utility model, the plunger assembly is provided with the telescopic reset piece, and the reset piece drives the cylinder body to move so that the oil distribution disc has an axial movement space and drives the oil distribution disc to move and reset to the outside of the shell.

(3) In the utility model, the end part of the shell is provided with the unidirectional limiting piece matched with the oil distribution disc, and the limiting piece is formed in a stamping mode, so that the integrity of the shell is ensured, and the shell can be processed and formed after the oil distribution disc is assembled, and the assembly of the oil distribution disc is not influenced.

Drawings

The utility model will be further described with reference to the drawings and examples.

FIG. 1 is a perspective view of a specific embodiment of an internal circulation pressure relief type plunger pump according to the present utility model;

FIG. 2 is an exploded view of an embodiment of the internal circulation pressure relief type plunger pump according to the present utility model;

FIG. 3 is an axial cross-sectional view of an embodiment of an internal circulation pressure relief type plunger pump according to the present utility model;

FIG. 4 is a schematic view of a limiting structure of an oil distribution disc and a shell in the utility model;

FIG. 5 is an enlarged view of FIG. 4 at a;

FIG. 6 is an end view of the mating structure of the oil distribution plate and the housing of the present utility model;

FIG. 7 is an end axial cross-sectional view of the housing of the present utility model;

FIG. 8 is a schematic view of the orientation of the oil distribution pan with the housing;

FIG. 9 is a schematic view of the oil pump of the present utility model in a normal assembled state;

FIG. 10 is a schematic view of the oil pump of the present utility model in a blocked outlet condition;

FIG. 11 is a schematic diagram of the pressure relief principle of the oil pump according to the present utility model;

fig. 12 is a schematic view of the mating structure of the oil distribution plate and the housing in the present utility model.

In the figure, 1, a shell, 101, an oil return hole, 2, a plunger assembly, 201, a swash plate, 202, a plunger, 203, a cylinder body, 3, an oil distribution disc, 301, an oil inlet, 302, an oil outlet, 4, an oil cavity, 5, a flow channel, 6, a plunger hole, 7, a variable volume cavity, 8, an oil through hole, 9, a resetting piece, 10, a butt joint hole, 11, a liquid outlet, 12, a limiting protrusion, 13, a stamping protrusion, 14, a stamping groove, 15, a positioning protrusion, 16, a positioning groove, 17, a shell, 18, a liquid inlet, 19 and a fixed sleeve.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

As shown in fig. 1-3, an internal circulation pressure relief type plunger pump comprises a shell 1, a plunger assembly 2 and an oil distribution disc 3, wherein a cavity is formed in the shell 1, and an oil return hole 101 communicated with the inside and the outside of the shell 1 is formed in the surface of the shell 1; the plunger assembly 2 is arranged in the cavity, and the plunger assembly 2 forms an oil cavity 4 communicated with the oil return hole 101 in the cavity; the oil distribution disc 3 is arranged in the cavity and is positioned at the axial end part of the plunger assembly 2, the oil distribution disc 3 is provided with an oil inlet 301 and an oil outlet 302, the oil distribution disc 3 can slide back and forth along the axial direction of the shell 1 through the plunger assembly 2, and when the oil distribution disc 3 slides towards the inside of the shell 1, a circulation channel 5 for communicating the oil inlet 301, the oil outlet 302 and the oil return 101 is formed between the oil distribution disc 3 and a structure matched with the oil distribution disc (such as a shell 17 of the oil pump assembly).

The plunger assembly 2 and the oil distribution disc 3 are matched to complete oil inlet and oil outlet actions, in a normal state, the oil distribution disc 3 is located at the outermost side in the shell 1, an oil outlet 302 of the oil distribution disc 3 can be in butt joint with a liquid outlet 11 of an oil pump (shown in fig. 9), oil is directly discharged out of the oil pump, when an oil pump outlet channel is blocked, under the high-pressure action of the oil pump outlet, the oil distribution disc 3 moves towards the inside of the shell 1, so that the oil outlet 302 and the liquid outlet 11 are disconnected (shown in fig. 10), oil can flow to the oil inlet 301 and the oil return hole 101 from a gap (namely a flow channel 5) between the shell 1 and the oil pump, then returns to the oil outlet 302 through the plunger assembly 2 and is discharged, and accordingly the plunger assembly 2 can normally operate through circulation of oil (an oil flow path shown in fig. 11) formed by the plunger pump, and the motor for driving the plunger assembly 2 is prevented from being blocked.

Preferably, the plunger assembly 2 is provided with an oil through hole 8 which is communicated with the oil cavity 4 and the end face of the plunger assembly 2 where the oil distribution disc 3 is located, the oil through hole 8 can be in butt joint with the oil inlet hole 301, when an outlet channel of the oil pump is blocked and pressure relief is needed, oil flowing back to the oil cavity 4 through the flow channel 5 flows to the oil inlet hole 301 through the oil through hole 8, and under the action of the plunger assembly 2, the oil flows from the oil outlet hole 302 to the flow channel 5, so that cyclic pressure relief is realized.

The plunger assembly 2 generally comprises a swash plate 201, a cylinder 203 and a plunger 202 positioned between the swash plate 201 and the cylinder 203, wherein an oil through hole 8 is positioned in the cylinder 203, an axially telescopic reset piece 9 is arranged between the plunger 202 and the cylinder 203, the reset piece 9 enables the plunger 202 to be abutted against the surface of the swash plate 201, an oil cavity 4 is formed between the swash plate 201 and the cylinder 203, the cylinder 203 is arranged near one end of the oil distribution disc 3, one end of the cylinder 203, facing the swash plate 201, is provided with a plunger hole 6 for inserting the plunger 202, a variable volume cavity 7 is formed in the plunger hole 6, and the variable volume cavity 7 is communicated with the end face of the cylinder 203 where the oil distribution disc 3 is positioned, so that the variable volume cavity 7 is alternately communicated with the oil inlet hole 301 and the oil outlet hole 302. Here, as in the prior art plunger pump, one end of the plunger 202 is connected to the swash plate 201, the other end extends into the plunger hole 6, one end of the swash plate 201 facing the cylinder 203 is inclined, and the plunger 202 is connected to the swash plate 201 through a shoe. When the plunger pump works, the cylinder 203 is driven to rotate by an external motor, the plunger 202 and the cylinder 203 synchronously rotate, and as the surface of the swash plate 201 is an inclined plane, the plunger 202 can reciprocate in the rotating process, when the plunger 202 moves into the plunger hole 6, the pressure in the variable volume cavity 7 is increased, and when the cylinder 203 rotates until the variable volume cavity 7 is communicated with the oil outlet 302, the oil in the variable volume cavity 7 is pushed out by the plunger 202 and then is discharged from the oil outlet 302; when the plunger 202 moves out of the plunger hole 6, the pressure in the variable volume cavity 7 is reduced to form negative pressure, and when the cylinder 203 rotates until the variable volume cavity 7 is communicated with the oil inlet 301, oil is sucked into the variable volume cavity 7 from the oil inlet 301, so that a cycle is formed, and the cycle is an oil circulation process when the plunger pump works normally. As shown in fig. 3, the cylinder 203 has a butt hole 10 extending from the variable volume chamber 7 toward one end of the cylinder 203 toward the oil distribution plate 3, the butt hole 10 alternately butt-jointed with an oil inlet hole 301 and an oil outlet hole 302, and the oil passage hole 8 penetrates in the axial direction of the cylinder 203.

In a traditional oil pump, an oil distribution disc 3 of the plunger pump is of a fixed structure and is always in butt joint with liquid inlet and liquid outlet of the oil pump, when an outlet of the oil pump is blocked, oil circulation cannot be formed through the oil pump, and in order to ensure normal operation of the plunger pump, the connection mode of the oil distribution disc 3 and a shell 1 is changed into a mode capable of reciprocating motion.

The reciprocating movement of the oil distribution disc 3 is realized by the reset piece 9, and the reset piece 9 is abutted in the plunger hole 6 by the plunger 202, namely, the reset piece 9 is positioned in the variable-volume cavity 7. When the outlet of the oil pump is blocked, the pressure of the liquid outlet 11 of the oil pump is increased, so that the oil distribution disc 3 is pushed to move towards the inside of the shell 1, the plunger pump forms oil circulation, and when the pressure disappears, the reset piece 9 can push the cylinder 203 and the oil distribution disc 3 to move towards the outside of the shell 1 until the reset piece is abutted with the oil pump. Preferably, a groove for the return element 9 to extend into is arranged at one end of the plunger 202 facing the variable volume cavity 7, so that the linear motion of the return element 9 is ensured.

The return member 9 may be a return spring whose compression increases when the oil distribution plate 3 moves toward the inside of the housing 1.

Since the oil distribution plate 3 slides reciprocally in the housing 1, the housing 1 only needs to limit the oil distribution plate 3 in one way, i.e. limit the maximum distance by which the oil distribution plate 3 slides out of the housing 1. Normally, the outer circumferential surface of the oil distribution disc 3 is provided with a limiting protrusion 12, in this embodiment, one axial end of the outer shell 1 is provided with a limiting piece which is matched with the limiting protrusion 12 to form a unidirectional limiting, and when the pressure is too high, overpressure protection can be performed, so that the internal cylinder 203 is prevented from being blocked.

In order to facilitate the installation of the oil distribution disc 3, the limiting piece and the shell 1 are arranged in a split mode, namely, the limiting piece and the shell are connected and fixed with each other after being produced respectively. In the preferred embodiment, the limiting member is a stamping protrusion 13 located on the inner peripheral surface of the casing 1 and matched with the end surface of the limiting protrusion 12, the stamping protrusion 13 is formed by stamping the axial end surface of the casing 1, as shown in fig. 4 and 5, stamping is performed on the end surface of the casing 1 near the oil distribution disc 3, a stamping groove 14 is formed on the end surface, and at this time, the stamping protrusion 13 is formed on the inner wall of the casing 1. The stamping protrusion 13 may have a ring-shaped structure or a plurality of arc-shaped structures which are not connected with each other, such as the stamping groove 14 having two arc-shaped structures in fig. 6.

In order to ensure the linear movement of the oil distribution disc 3, as shown in fig. 8, preferably, the outer circumferential surface of the oil distribution disc 3 is provided with a positioning protrusion 15, and the inner circumferential surface of the housing 1 is provided with a positioning groove 16 for the positioning protrusion 15 to reciprocate, i.e. the length of the positioning groove 16 is greater than that of the positioning protrusion 15, and the end surfaces of the positioning protrusion 15 and the positioning groove 16 can be in a sector, triangle, rectangle or other irregular shape.

In other alternative embodiments, as shown in fig. 12, the limiting member may also be a fixing sleeve 19 sleeved on an axial end of the casing 1, where the fixing sleeve 19 has a limiting end surface for unidirectional limiting of the oil distribution disc 3, and the fixing sleeve 19 and the casing 1 may be screwed, clamped or welded to each other, that is, the fixing sleeve 19 cooperates with the limiting protrusion 12 to limit the oil distribution disc 3.

An oil pump, as shown in fig. 9-11, comprises a shell 17 and the above-mentioned internal circulation pressure relief type plunger pump in the shell 17, wherein a mounting groove for accommodating the plunger pump is arranged in the shell 17, a gap is arranged between the shell 1 and the inner wall of the mounting groove after the plunger pump is mounted, a liquid inlet 18 and a liquid outlet 11 are arranged on the surface of the shell 17, the liquid inlet 18 is in butt joint with an oil inlet 301, and the liquid outlet 11 is in butt joint with an oil outlet 302. When the oil distribution disc 3 slides to the outside of the shell 1, the oil outlet 302 is connected with the liquid outlet 11 of the shell 17, when the oil distribution disc 3 slides to the inside of the shell 1, the oil outlet 302 is separated from the liquid outlet 11 of the shell 17, a circulation channel 5 is arranged outside the shell 1 in the installation groove, and oil can flow from the oil outlet 302 to the oil inlet 301 and the oil return 101 through the circulation channel 5.

In practical application, the plunger pump and the oil pump can be applied to a servo motor driving and controlling integrated system.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "center", "inner", "outer", "axial", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In this specification, a schematic representation of the terms does not necessarily refer to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments.

With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.

Claims (10)

1. An internal circulation pressure relief type plunger pump, comprising:

the shell (1) is internally provided with a cavity, and the surface of the shell is provided with an oil return hole (101) communicated with the inside and the outside of the shell (1);

the plunger assembly (2) is arranged in the cavity, and an oil cavity (4) communicated with the oil return hole (101) is formed in the cavity by the plunger assembly (2);

the oil distribution disc (3) is arranged in the cavity and is positioned at the axial end part of the plunger assembly (2), an oil inlet hole (301) and an oil outlet hole (302) are formed in the oil distribution disc (3), the oil distribution disc (3) slides back and forth along the axial direction of the shell (1) through the plunger assembly (2), and when the oil distribution disc (3) slides towards the inside of the shell (1), a circulation channel (5) for communicating the oil inlet hole (301), the oil outlet hole (302) and the oil return hole (101) is formed between the oil distribution disc (3) and the matched structure.

2. The internal circulation pressure relief type plunger pump according to claim 1, wherein: the plunger assembly (2) is provided with an oil through hole (8) which is communicated with the oil cavity (4) and the end face of the plunger assembly (2) where the oil distribution disc (3) is located, and the oil through hole (8) is in butt joint with the oil inlet hole (301).

3. The internal circulation pressure relief type plunger pump according to claim 2, wherein: the plunger assembly (2) comprises a swash plate (201), a cylinder body (203) and a plunger (202) arranged between the swash plate (201) and the cylinder body (203), wherein an oil through hole (8) is formed in the cylinder body (203), an axially telescopic reset piece (9) is arranged between the plunger (202) and the cylinder body (203), an oil cavity (4) is formed between the swash plate (201) and the cylinder body (203), the cylinder body (203) is arranged close to one end of the oil distribution disc (3), one end of the cylinder body (203) facing the swash plate (201) is provided with a plunger hole (6) for the plunger (202) to be inserted, a variable volume cavity (7) is formed in the plunger hole (6), and the end face of the cylinder body (203) where the oil distribution disc (3) is communicated with the oil inlet hole (301) and the oil outlet hole (302) alternately.

4. The internal circulation pressure relief type plunger pump according to claim 1, wherein: the outer peripheral surface of the oil distribution disc (3) is provided with a limiting protrusion (12), and one axial end of the shell (1) is provided with a limiting piece which is matched with the limiting protrusion (12) to form one-way limiting.

5. The internal circulation pressure relief type plunger pump according to claim 4, wherein: the limiting piece is a stamping protrusion (13) which is positioned on the inner peripheral surface of the shell (1) and matched with the end surface of the limiting protrusion (12), and the stamping protrusion (13) is formed by stamping the axial end surface of the shell (1).

6. The internal circulation pressure relief type plunger pump according to claim 5, wherein: the stamping protrusion (13) is of an annular structure or a plurality of arc structures which are not connected with each other.

7. The internal circulation pressure relief type plunger pump according to claim 6, wherein: the outer peripheral surface of the oil distribution disc (3) is provided with a positioning protrusion (15), and the inner peripheral surface of the shell (1) is provided with a positioning groove (16) for the positioning protrusion (15) to reciprocate.

8. The internal circulation pressure relief type plunger pump according to claim 3, wherein: the cylinder body (203) is provided with a butt joint hole (10) extending from the variable volume cavity (7) to one end of the cylinder body (203) towards the oil distribution disc (3), the butt joint hole (10) is alternately butt-jointed with the oil inlet hole (301) and the oil outlet hole (302), and the oil through hole (8) is communicated in the axial direction of the cylinder body (203).

9. The internal circulation pressure relief type plunger pump according to claim 3, wherein: the reset piece (9) is a reset spring.

10. An oil pump, characterized in that: the internal circulation pressure relief type plunger pump comprises a shell (17) and the internal circulation pressure relief type plunger pump which is positioned in the shell (17), wherein when an oil distribution disc (3) slides towards the outside of the shell (1), the oil outlet (302) is connected with a liquid outlet (11) of the shell (17), and when the oil distribution disc (3) slides towards the inside of the shell (1), the oil outlet (302) is separated from the liquid outlet (11) of the shell (17).