阅读说明：本技术 自回程柱塞及其柱塞泵 (Self-return plunger and plunger pump thereof ) 是由 史淼奇 高魏磊 于 2020-06-08 设计创作，主要内容包括：本发明属于柱塞泵技术领域,尤其涉及一种自回程柱塞及其柱塞泵。本发明针对现有技术中利用回程盘实现柱塞回程易于造成柱塞的损坏,同时回程盘本身也有较大的损耗的问题,提供一种自回程柱塞及其柱塞泵,包括柱塞本体,所述柱塞本体上还连接有可与柱塞本体做同步运动的导杆,所述导杆与柱塞本体之间具有间隙。本发明在柱塞本体上连接有导杆,通过推动导杆实现柱塞本体的回程,从而无需设置回程盘。(The invention belongs to the technical field of plunger pumps, and particularly relates to a self-return plunger and a plunger pump thereof. The invention provides a self-return plunger and a plunger pump thereof, aiming at the problems that the plunger is easy to damage due to the return stroke of a plunger realized by a return stroke disc in the prior art and the return stroke disc has larger loss. According to the invention, the guide rod is connected to the plunger body, and the return stroke of the plunger body is realized by pushing the guide rod, so that a return stroke disc is not required.)

1. A self-retracting plunger comprising a plunger body (1), characterized in that: the plunger piston is characterized in that the plunger piston body (1) is further connected with a guide rod (2) capable of synchronously moving with the plunger piston body (1), and a gap (3) is formed between the guide rod (2) and the plunger piston body (1).

2. The self-retracting plunger of claim 1, wherein: the axial lead of the guide rod (2) is parallel to the axial lead of the plunger body (1), and the guide rod (2) is fixedly connected with the plunger body (1) or integrally formed.

3. A plunger pump with a self-return plunger, comprising a plunger pump cylinder body (4) with a plunger hole (6) inside and a port plate (5), wherein the port plate (5) is provided with a hydraulic medium flow hole (7) penetrating through the port plate (5), and the plunger hole (6) is communicated with the hydraulic medium flow hole (7), characterized in that: plunger hole (6) are equipped with a plurality of, and plunger body (1) one-to-one ground sliding connection is in plunger hole (6), still be equipped with in plunger pump cylinder body (4) with isolated hydraulic pressure hole (8) that reset of plunger hole (6), guide arm (2) sliding connection is in hydraulic pressure hole (8) that resets, and guide arm (2) and hydraulic pressure hole (8) that resets one-to-one set up, still include intercommunication groove (9), are linked together through intercommunication groove (9) between the hydraulic pressure hole (8) that resets.

4. The plunger pump of claim 3, wherein: the communicating groove (9) is positioned on the surface of one end of the plunger pump cylinder body (4) close to the valve plate (5).

5. The plunger pump of claim 3, wherein: the plunger pump is characterized by further comprising a swash plate (10) with the thickness gradually increased from one end to the other end, an inclined surface (11) on the swash plate (10) is attached to one end, far away from the valve plate (5), of the plunger body (1), and the swash plate (10) can push the plunger body (1) to slide along the plunger hole (6) by rotating the plunger pump cylinder body (4).

6. The plunger pump of claim 5, wherein: the surface of one end of the plunger body (1) close to the swash plate (10) is arc-shaped.

7. The plunger pump of claim 3, wherein: the plunger piston holes (6) and the reset hydraulic holes (8) are uniformly distributed along the circumferential direction of the axial lead of the plunger piston pump cylinder body (4).

8. The plunger pump of claim 3, wherein: the oil filling device is characterized by further comprising an oil filling pipe (12) connected to the plunger pump cylinder body (4) or the valve plate (5), wherein the oil filling pipe (12) is communicated with the communication groove (9) or the plunger hole (6) through a one-way valve.

Technical Field

The invention belongs to the technical field of plunger pumps, and particularly relates to a self-return plunger and a plunger pump 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. In the prior art, the plunger return of the plunger pump mainly depends on the application of pulling force on a sliding shoe in the rotation process of a return disc, so that the return of the plunger is realized. However, in the use process, the return disc usually has a faster rotating speed, which can cause the sliding shoe to be easily pulled off from the plunger, resulting in damage to the plunger, and meanwhile, the return disc has larger loss, resulting in a shorter service life of the whole plunger pump.

For example, the chinese utility model discloses a forced return stroke dish distribution plunger type water pump [ application number: 201720285846.3], the utility model discloses a pump, including pump main part, rotary unit, valve plate and return stroke mechanism, wherein, the pump main part includes casing, rear end cap, front end housing and sloping cam plate, the inner wall circumference of casing is provided with a plurality of spacing rings, be provided with the spring hole on the spacing ring, rear end cap and front end housing are installed respectively at the front end and the rear end of casing, the rear end cap includes the lid and stretches into the main shaft of support in the casing, the sloping cam plate is installed on the main shaft of support and the sloping cam plate is kept away from the terminal surface of lid and is the inclined plane, be provided with water pump inlet and water pump outlet on the front end housing; the flow distribution disc is arranged in the pump main body and is fixedly arranged on the front end cover, a kidney-shaped groove and a through groove are formed in the flow distribution disc, the kidney-shaped groove is communicated with a water pump outlet, and the through groove is communicated with a water pump inlet and a cavity; the rotating unit comprises a transmission shaft, a cylinder body, a plunger piston shoe assembly, a main bearing, a floating disc, a spring seat and a center spring, the transmission shaft is rotatably arranged on the front end cover, the cylinder body is provided with a through hole, the rear end of the transmission shaft penetrates through the front end cover and then extends into the shell and is fixedly connected to the cylinder body, the cylinder block is rotatably arranged on a supporting main shaft of the rear end cover through the main bearing, the plunger and slipper assembly is circumferentially provided with a plurality of plunger and slipper assemblies which are all positioned in a cylinder hole of the cylinder block, the floating disc is arranged between the cylinder body and the port plate and is fixedly arranged on the port plate, the spring seat is rotatably arranged on a supporting main shaft of the rear end cover, the central spring is positioned in the through hole of the cylinder body, the rear end of the central spring abuts against the spring seat, and the front end of the central spring abuts against the transmission shaft; the return mechanism comprises a return disc, a plurality of return springs, a wedge-shaped sleeve and an anti-rotation pin, the return disc is located between the swash plate and the wedge-shaped sleeve, each plunger piston shoe assembly is abutted to the inclined surface of the swash plate after penetrating through the return disc respectively, the return disc is obliquely arranged, the inclination of the return disc is consistent with that of the inclined surface of the swash plate, each return spring is installed in a spring hole of the limiting ring, one end of each return spring is abutted to the inner wall of the limiting ring, and the other end of each return spring is pressed tightly against the return disc through the wedge-shaped sleeve.

The plunger piston return stroke is realized by applying a pulling force to the plunger piston by using the return stroke disc, so the problems that the plunger piston and the return stroke disc are easy to damage and the service life is short exist.

Disclosure of Invention

The present invention is directed to solving the above problems and providing a self-return plunger that can effectively prolong the life of a plunger pump without a return disc.

Another object of the present invention is to solve the above problems, and to provide a plunger pump which can effectively prolong the life of the plunger pump without using a return disc.

In order to achieve the purpose, the invention adopts the following technical scheme:

the self-return plunger comprises a plunger body, wherein a guide rod capable of synchronously moving with the plunger body is further connected to the plunger body, and a gap is formed between the guide rod and the plunger body.

In the self-return plunger, the axis of the guide rod is parallel to the axis of the plunger body, and the guide rod is fixedly connected with the plunger body or integrally formed with the plunger body.

The utility model provides a plunger pump with from return stroke plunger, includes that inside has plunger pump cylinder body and the valve plate in plunger hole, the last hydraulic medium circulation hole that has a perfect understanding valve plate that has of valve plate, the plunger hole is linked together with hydraulic medium circulation hole, the plunger hole is equipped with a plurality of, and plunger body one-to-one sliding connection is downthehole at the plunger, still be equipped with the hydraulic pressure hole that resets isolated with the plunger hole in the plunger pump cylinder body, guide arm sliding connection is downthehole at the hydraulic pressure that resets, and the guide arm sets up with the hydraulic pressure hole one-to-one that resets, still includes the intercommunication groove, is linked together through the intercommunication groove between the hydraulic pressure hole that resets.

In the plunger pump, the communicating groove is formed in the surface of the plunger pump cylinder body, which is close to one end of the valve plate.

In the plunger pump, the thickness of the swash plate gradually increases from one end to the other end, the inclined surface on the swash plate is attached to one end, away from the thrust plate, of the plunger body, and the swash plate can push the plunger body to slide along the plunger hole by rotating the cylinder body of the plunger pump.

In the plunger pump, the plunger holes and the reset hydraulic holes are uniformly distributed along the circumferential direction of the axial lead of the plunger pump cylinder body.

The plunger pump further comprises an oil filling pipe connected to the plunger pump cylinder body or the valve plate, and the oil filling pipe is communicated with the communicating groove or the plunger hole through a one-way valve.

Compared with the prior art, the invention has the advantages that:

1. according to the invention, the guide rod is connected to the plunger body, and the return stroke of the plunger body is realized by pushing the guide rod, so that a return stroke disc is not required to be arranged, and the problem that the plunger and the return stroke disc are easy to damage is avoided.

2. The plunger body is pushed to return by utilizing the communicating groove and the plunger hole which are filled with liquid and are communicated with each other to replace a traditional return disc, meanwhile, the liquid can be supplemented into the liquid system through the oil filling pipe, and the plunger body is easy to maintain after use.

Drawings

FIG. 1 is a schematic structural view of a self-retracting plunger;

FIG. 2 is a cross-sectional view of the plunger pump;

FIG. 3 is a schematic view of the construction of a plunger pump;

FIG. 4 is a schematic structural view of a part of the structure of the plunger pump;

in the figure: plunger body 1, guide rod 2, clearance 3, plunger pump cylinder body 4, valve plate 5, plunger hole 6, hydraulic pressure medium flow through hole 7, hydraulic pressure hole 8, intercommunication groove 9, sloping cam plate 10, inclined plane 11, oil filling pipe 12.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.