CN220505254U

CN220505254U - Plunger pump

Info

Publication number: CN220505254U
Application number: CN202321685586.0U
Authority: CN
Inventors: 崔璨; 史伟东; 崔凯
Original assignee: Weichai Hydraulic Transmission Co ltd; Weichai Power Co Ltd
Current assignee: Weichai Hydraulic Transmission Co ltd; Weichai Power Co Ltd
Priority date: 2023-06-29
Filing date: 2023-06-29
Publication date: 2024-02-20
Anticipated expiration: 2033-06-29

Abstract

The utility model provides a plunger pump, which comprises a shell and a sloping cam plate, wherein a cavity is formed in the shell; a limiting assembly is arranged on the inner wall of the shell, and comprises a limiting boss arranged on the inner wall of the shell; the swash plate is arranged in the cavity, a swash plate boss is arranged on one side of the swash plate opposite to the limiting boss, and the swash plate boss is in butt fit with the limiting boss so as to be used for limiting small displacement. The plunger pump cancels the structures such as the limit screw, the nut, the rubber sealing ring and the like, and realizes small-displacement limit by directly adding the limit boss on the shell, thereby saving the arrangement space and realizing more compact structural arrangement; meanwhile, the number of parts is reduced, the assembly beat is reduced, and the cost is saved; and the sealing is not needed, so that the leakage risk is reduced, and the reliability is improved.

Description

Plunger pump

Technical Field

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

Background

The small-displacement limiting structure adopted by the existing plunger pump comprises screws, nuts and sealing rings, the number of parts is large, sealing is needed, the leakage risk is increased, the reliability is reduced, the processing and assembling cost is high, and the occupied space is large.

Disclosure of Invention

In order to overcome the defects in the prior art, the main purpose of the utility model is to provide the plunger pump, compared with the prior art, the plunger pump has the advantages that the structures such as the limit screw, the nut and the rubber sealing ring are omitted, the limit boss is directly added on the shell, the small-displacement limit is realized, the arrangement space is saved, and the structural arrangement is more compact; meanwhile, the number of parts is reduced, the assembly beat is reduced, and the cost is saved; and the sealing is not needed, so that the leakage risk is reduced, and the reliability is improved.

In order to achieve the above object, the present utility model provides a plunger pump.

The plunger pump includes:

a housing having a chamber therein; a limiting assembly is arranged on the inner wall of the shell, and comprises a limiting boss arranged on the inner wall of the shell;

the swash plate is arranged in the cavity, a swash plate boss is arranged on one side of the swash plate opposite to the limiting boss, and the swash plate boss is in butt fit with the limiting boss so as to be used for limiting small displacement.

Furthermore, the limiting boss is in a round table shape, and the relatively smaller surface of the limiting boss is opposite to the swash plate.

Furthermore, the sloping cam plate boss is round platform form, and its less surface just to spacing boss setting relatively.

Further, the limiting assembly further comprises an elastic piece, one end of the elastic piece is sleeved on the limiting boss, and the other end of the elastic piece is sleeved on the swash plate boss.

Further, both ends of the elastic piece are free ends.

Further, the device also comprises an adjusting mechanism in transmission fit with the sloping cam plate; the adjustment mechanism includes:

a cylindrical cavity disposed on the housing;

one end of the servo piston is arranged in the cylindrical cavity, and the other end of the servo piston extends out of the cylindrical cavity and is hinged to one side, opposite to the sloping cam plate boss, of the sloping cam plate; the servo piston reciprocates relative to the cylindrical cavity to push the swash plate to adjust the inclination angle.

Further, an annular groove is formed in the cavity wall of the cylindrical cavity; an oil outlet communicated with the servo oil cavity is formed in the side face of the servo piston, and the oil outlet is matched with the annular groove.

Further, a spherical groove is formed in one side, opposite to the boss of the swash plate, a ball head is arranged at one end of the servo piston, and the ball head is rotationally connected with the spherical groove.

Further, a limiting plug is arranged at the end part of the cylindrical cavity, which is far away from the swash plate, and the limiting plug is in butt fit with the servo piston.

Further, the annular groove is arranged at one end of the cylindrical cavity, which is close to the swash plate.

The utility model has the advantages that:

1. the small-displacement limit screw is canceled, the limit boss is added on the shell, limit is realized, the structure is simple, the arrangement space is saved, and the structural arrangement is more compact.

2. The number of parts is reduced, the assembly time is reduced, and the cost is saved.

3. And sealing is not needed, so that the leakage risk is reduced, and the reliability is improved.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a schematic cross-sectional view of a plunger pump according to an embodiment of the present utility model;

FIG. 2 is a schematic cross-sectional view of a plunger pump in an embodiment of the present utility model, where the oil outlet of the servo piston just reaches the annular groove;

fig. 3 is a schematic cross-sectional structure of a plunger pump when a limit boss on a housing is in limit fit with a swash plate boss in an embodiment of the present utility model.

In the figure:

1. a housing; 2. a limit boss; 3. an elastic member; 4. a swash plate; 5. swash plate boss;

6. an adjusting mechanism; 601. a servo piston; 602. an oil outlet; 603. an annular groove; 604. ball head; 605. and a limit plug.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Hydraulic pump: the axial plunger hydraulic pump is used for providing high-pressure liquid for the hydraulic motor of the engineering machinery.

In the prior art, a screw hole is generally formed in an end cover, a small-displacement limiting screw is arranged in the screw hole, a screw hole sealing assembly is arranged outside the screw hole, and the axis of the screw hole is coaxial with the axis of the return piston.

Set up the screw hole on the casing side, be equipped with stop screw in the screw hole, the screw hole outside is equipped with screw hole seal assembly, through stop screw and sloping cam plate contact, realizes that the low discharge capacity is spacing.

The small-displacement limiting structure in the prior art comprises structures such as screws, nuts, sealing rings and the like, is large in number of parts, needs to be sealed, increases leakage sealing boxes, reduces reliability, is high in processing and assembling cost, and occupies a large space.

In view of the above, the utility model provides a compact structural arrangement, saves arrangement space, reduces the number of parts, reduces assembly beats and saves cost; and the plunger pump does not need sealing, reduces leakage risk and improves reliability.

Fig. 1 is a schematic cross-sectional view showing a plunger pump according to an embodiment of the present utility model.

As shown in fig. 1, the plunger pump in the present utility model includes a housing 1 and a swash plate 4, wherein the housing 1 has a chamber inside, and the swash plate 4 is placed in the chamber; a limiting assembly is arranged on the inner wall of the shell 1 and comprises a limiting boss 2 arranged on the inner wall of the shell 1; and a swash plate boss 5 is arranged on one side of the swash plate 4 opposite to the limit boss 2, and the swash plate boss 5 is in butt fit with the limit boss 2 so as to be used for limiting small displacement.

In the utility model, when the swing angle of the swash plate 4 changes to a small angle, the swash plate boss 5 contacts with the limit boss 2 on the shell 1, so as to realize small-displacement limit.

Compared with the structure in the prior art, the utility model omits the limit screw, the nut and the rubber sealing ring, and realizes small-displacement limit by directly arranging the limit boss 2 on the inner wall of the shell 1, thereby saving the arrangement space and realizing more compact structural arrangement; meanwhile, the number of parts is reduced, the assembly beat is reduced, and the cost is saved; in addition, sealing is not needed, so that leakage risk is reduced, and reliability is improved.

As shown in fig. 1, the limit boss 2 is in a circular truncated cone shape, and a relatively small surface of the circular truncated cone-shaped limit boss 2 is arranged opposite to the swash plate 4 to form a limit fit with the swash plate boss 5.

As shown in fig. 1, the swash plate boss 5 is in a circular truncated cone shape, and a relatively small surface of the circular truncated cone-shaped swash plate boss 5 is disposed opposite to the limit boss 2 to form a limit fit with the limit boss 2.

It should be noted that the structure of the limit boss 2 is in a shape of a circular truncated cone, so that the limit boss is simple in structure, and the specific structure of the limit boss 2 can be designed according to actual needs in operation, so that limit fit with the swash plate boss 5 is formed.

Correspondingly, the specific structure of the swash plate boss 5 can be designed according to actual needs so as to meet the limit matching effect of the swash plate boss and the limit boss 2, and the specific limitation is not made.

As shown in fig. 1, the limiting assembly further comprises an elastic member 3, one end of the elastic member 3 is sleeved on the limiting boss 2, and the other end of the elastic member 3 is sleeved on the swash plate boss 5.

In the embodiment of the present utility model, the elastic member 3 is provided so that the swash plate 4 has an elastic return function.

In the utility model, the two ends of the elastic piece 3 are both free ends, so that the limit matching of the limit boss 2 and the swash plate boss 5 can be better realized.

The plunger pump in the utility model also comprises an adjusting mechanism 6 which is in transmission fit with the swash plate 4 so as to realize the adjustment of the inclination angle of the swash plate 4.

As shown in fig. 1, the adjustment mechanism includes a cylindrical cavity provided on the housing 1, and a servo piston 601 slidably fitted with the cylindrical cavity. Specifically, one end of the servo piston 601 is arranged in the cylindrical cavity, and the other end of the servo piston 601 extends out of the cylindrical cavity and is hinged to one side, opposite to the swash plate boss 5, of the swash plate 4; the servo piston 601 reciprocates with respect to the cylindrical chamber to push the swash plate 4 to adjust the inclination angle.

In the utility model, when the swing angle of the swash plate 4 changes to a large angle, the servo piston 601 contacts with the limiting plug 605 arranged at the end part of the cylindrical cavity, so that large-displacement limiting is realized.

When the swing angle of the swash plate 4 changes to a small angle, the swash plate boss 5 is in contact with the limit boss 2 on the shell 1, so that small-displacement limit is realized.

As shown in fig. 1, a stopper 605 is provided on the cylindrical cavity and away from an end of the swash plate 4, and the stopper 605 is fitted in abutment with the servo piston 601.

When the swing angle of the swash plate 4 changes to a large angle, the servo piston 601 moves in a direction approaching the limit plug 605; during small changes in the swashplate 4 angle, the servo piston 601 moves away from the stop plug 605.

As shown in fig. 1, an annular groove 603 is formed on the wall of the cylindrical cavity and is used for matching with an oil outlet 602 on the servo piston 601 to drain oil from the servo oil cavity.

In the embodiment of the present utility model, the annular groove 603 is provided at one end of the cylindrical cavity near the swash plate 4.

As shown in fig. 1, an oil outlet 602 communicated with the servo oil cavity is formed on the side surface of the servo piston 601, and the oil outlet 602 is matched with the annular groove 603 to drain oil from the servo oil cavity.

In the utility model, because the small-displacement limit is in line contact, under emergency working conditions, such as the situation that the load suddenly increases, the contact position of the swash plate 4 and the shell 1 may be larger in stress, and the strength is not satisfied.

Fig. 2 shows a schematic cross-sectional structure of the plunger pump in the present utility model when the oil outlet 602 of the servo piston 601 just reaches the annular groove 603.

Fig. 3 shows a schematic cross-sectional structure of the plunger pump when the limit boss 2 on the casing 1 is in limit fit with the swash plate boss 5.

As shown in fig. 2 and 3, before the swash plate boss 5 abuts against the limit boss 2 on the casing 1, the oil outlet 602 on the servo piston 601 is communicated with the annular groove 603, and the oil in the servo oil cavity is drained, so that a buffer effect is achieved, overlarge contact stress between bosses is prevented, and reliability is improved.

Moreover, fig. 3 shows an angle β of a side of the swash plate 4 opposite to the swash plate boss 5 with respect to a horizontal plane of the bottom of the housing 1 when the limit boss 2 abuts against the swash plate boss 5 for limit fitting.

Fig. 2 shows the angle alpha of the side of the swash plate 4 opposite the swash plate boss 5 with respect to the horizontal plane of the bottom of the housing 1 when the oil outlet 602 on the servo piston 601 is just in communication with the annular groove 603.

The included angle alpha is larger than the included angle beta, so that a good buffer effect is ensured, the limit boss 2 is prevented from being excessively large in contact stress, and the reliability is improved.

As shown in fig. 1, a spherical recess is provided on the side of the swash plate 4 opposite to the swash plate boss 5, and a ball head 604 is provided at one end of the servo piston 601, and the ball head 604 is rotatably connected to the spherical recess.

As shown in fig. 1, the plunger pump of the present utility model further includes a main shaft, a rotor cylinder, and a plunger assembly (not shown), wherein the rotor cylinder and the plunger assembly are disposed in a chamber of the housing 1, and the main shaft is inserted into the housing 1 to be in driving connection with the rotor cylinder in the housing 1, so that the main shaft can drive the rotor cylinder to rotate. The plunger assembly comprises a plunger, one end of the plunger is inserted into a plunger cavity, the other end of the plunger is connected with the swash plate 4, and the plunger can be pushed to reciprocate in the plunger cavity in the rotating process of the rotor cylinder body due to the inclined arrangement of the swash plate 4.

It should be noted that the term "comprising" in the description of the utility model and in the claims, as well as any variants thereof, is intended to cover a non-exclusive inclusion, for example, comprising a series of elements not necessarily limited to those elements explicitly listed, but may include other elements not explicitly listed or inherent to elements.

In the present utility model, the terms "upper", "lower", "bottom", "top", "left", "right", "inner", "outer", and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present utility model and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present utility model will be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. A plunger pump, comprising:

2. The plunger pump as set forth in claim 1, wherein said limit boss is in the shape of a circular truncated cone and has a relatively small surface facing said swash plate.

3. The plunger pump as set forth in claim 1, wherein said swash plate boss is in the shape of a circular truncated cone and has a relatively small surface facing said limit boss.

4. The plunger pump of claim 1, wherein the limit assembly further comprises an elastic member, one end of the elastic member is sleeved on the limit boss, and the other end of the elastic member is sleeved on the swash plate boss.

5. The plunger pump of claim 4, wherein both ends of said elastic member are free ends.

6. The plunger pump of claim 1, further comprising an adjustment mechanism in driving engagement with the swash plate; the adjustment mechanism includes:

a cylindrical cavity disposed on the housing;

7. The plunger pump of claim 6, wherein the cylindrical cavity has an annular groove in a cavity wall thereof; an oil outlet communicated with the servo oil cavity is formed in the side face of the servo piston, and the oil outlet is matched with the annular groove.

8. The plunger pump of claim 6, wherein a spherical recess is provided in the swash plate on a side opposite to the boss of the swash plate, and a ball is provided at an end of the servo piston, the ball being rotatably connected to the spherical recess.

9. The plunger pump of claim 6, wherein a stop plug is provided at an end of the cylindrical cavity remote from the swash plate, the stop plug being in abutting engagement with the servo piston.

10. The plunger pump of claim 7, wherein the annular groove is disposed at an end of the cylindrical cavity proximate the swash plate.