Self-returning plunger and plunger pump

Abstract

The present invention belongs to the technical field of plunger pumps, and in particular, relates to a self-returning plunger and a plunger pump thereof. In view of the problem in the prior art that the return of the plunger is easily damaged by a return disk, and the return disk itself also has a large loss, the present invention provides a self-returning plunger and a plunger pump thereof, comprising a plunger body, the plunger body is also connected to a guide rod that can move synchronously with the plunger body, and a gap is provided between the guide rod and the plunger body. The present invention has a guide rod connected to the plunger body, and the return of the plunger body is achieved by pushing the guide rod, so that there is no need to set a return disk.

Description

Technical Field

[0001] The invention belongs to the technical field of plunger pumps, and in particular relates to a self-returning plunger and a plunger pump thereof. Background Art

[0002] The plunger pump is an important device in the hydraulic system. It relies on the reciprocating motion of the plunger in the cylinder to change the volume of the sealed working chamber to achieve oil suction and oil pressure. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow regulation. In the prior art, the plunger return of the plunger pump mainly relies on the pulling force applied to the slipper during the rotation of the return disk to achieve the return of the plunger. However, during use, the return disk often has a faster rotation speed, which will cause the slipper to be easily pulled off the plunger, causing damage to the plunger. At the same time, the return disk itself also has a large loss, resulting in a shorter overall life of the plunger pump.

[0003] For example, a Chinese utility model patent discloses a forced return plate distribution plunger water pump [application number: 201720285846.3]. The utility model patent includes a pump body, a rotating unit, a distribution plate and a return mechanism, wherein the pump body includes a housing, a rear end cover, a front end cover and a swash plate, the inner wall of the housing is circumferentially provided with a plurality of limiting rings, the limiting rings are provided with spring holes, the rear end cover and the front end cover are respectively installed at the front end and the rear end of the housing, the rear end cover includes a cover body and a supporting spindle extending into the housing, and the swash plate is installed The end surface of the inclined plate on the supporting main shaft and away from the cover body is an inclined surface, and the front end cover is provided with a water pump inlet and a water pump outlet; the distribution plate is placed in the pump body and fixedly installed on the front end cover, and the distribution plate is provided with a waist-shaped groove and a through groove, the waist-shaped groove is connected with the water pump outlet, and the through groove communicates the water pump inlet and the cavity; the rotating unit includes a transmission shaft, a cylinder body, a plunger sliding shoe assembly, a main bearing, a floating plate, a spring seat and a center spring, the transmission shaft can be rotatably mounted on the front end cover, the cylinder body has a through hole, and the transmission The rear end of the moving shaft passes through the front end cover and extends into the housing and is fixedly connected to the cylinder body. The cylinder body is rotatably mounted on the supporting spindle of the rear end cover through the main bearing. The plunger shoe assembly is circumferentially arranged with multiple components and they are all located in the cylinder hole of the cylinder body. The floating plate is arranged between the cylinder body and the distribution plate and is fixedly mounted on the distribution plate. The spring seat is rotatably mounted on the supporting spindle of the rear end cover. The center spring is located in the through hole of the cylinder body and the rear end of the center spring abuts against the spring seat. The front end of the return mechanism is against the transmission shaft; the return mechanism includes a return plate, a plurality of return springs, a wedge sleeve and an anti-rotation pin, the return plate is located between the inclined plate and the wedge sleeve, each of the plunger shoe assemblies passes through the return plate and rests on the inclined surface of the inclined plate, the return plate is inclined and the inclination is consistent with the inclination of the inclined surface of the inclined plate, each return spring is installed in a spring hole of a limiting ring, one end of the return spring rests on the inner wall of the limiting ring, and the other end presses the return plate through the wedge sleeve.

[0004] The utility model uses the return disk to exert a pulling force on the plunger to realize the return of the plunger, so there are the above-mentioned problems that the plunger and the return disk are easily damaged and the service life is short. Summary of the invention

[0005] The object of the present invention is to solve the above problems and provide a self-returning plunger which does not require a return plate and can effectively extend the service life of a plunger pump.

[0006] Another object of the present invention is to provide a plunger pump that does not require a return plate and can effectively extend the life of the plunger pump in order to solve the above problem.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A self-returning plunger comprises a plunger body, the plunger body is also connected to a guide rod which can move synchronously with the plunger body, and a gap is provided between the guide rod and the plunger body.

[0009] In the above-mentioned self-returning plunger, the axis center line of the guide rod and the axis center line of the plunger body are parallel to each other, and the guide rod and the plunger body are fixedly connected or integrally formed.

[0010] A plunger pump with a self-returning plunger comprises a plunger pump cylinder body with a plunger hole inside and a distribution plate, the distribution plate has a hydraulic medium circulation hole that passes through the distribution plate, the plunger hole is connected to the hydraulic medium circulation hole, a plurality of plunger holes are provided, and the plunger bodies are slidably connected in the plunger holes in a one-to-one correspondence, a reset hydraulic hole isolated from the plunger hole is also provided in the plunger pump cylinder body, the guide rod is slidably connected in the reset hydraulic hole, and the guide rod and the reset hydraulic hole are arranged in a one-to-one correspondence, and also includes a connecting groove, and the reset hydraulic holes are connected through the connecting groove.

[0011] In the above plunger pump, the communicating groove is located on the surface of one end of the plunger pump cylinder body close to the distribution plate.

[0012] In the above plunger pump, the end surface of the plunger body close to the swash plate is in an arc shape.

[0013] The above plunger pump also includes a swash plate whose thickness gradually increases from one end to the other end. The inclined surface on the swash plate fits with the end of the plunger body away from the distribution plate. Rotating the plunger pump cylinder body can cause the swash plate to push the plunger body to slide along the plunger hole.

[0014] In the above plunger pump, the plunger hole and the reset hydraulic hole are evenly distributed along the circumference of the axis of the plunger pump cylinder body.

[0015] The above plunger pump also includes a refueling pipe connected to the plunger pump cylinder body or the distribution plate, and the refueling pipe is connected to the connecting groove or the plunger hole through a one-way valve.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] 1. In the present invention, a guide rod is connected to the plunger body, and the return stroke of the plunger body is achieved by pushing the guide rod, so there is no need to set a return disk, thus avoiding the problem that the plunger and the return disk are easily damaged.

[0018] The present invention utilizes a connecting groove and a plunger hole which are filled with liquid and interconnected to replace a traditional return plate to push the plunger body to return. At the same time, liquid can be added to the liquid system through a refueling pipe, which is easy to maintain after use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a self-returning plunger;

[0020] Figure 2 It is a cross-sectional view of a plunger pump;

[0021] Figure 3 It is a schematic diagram of the structure of a plunger pump;

[0022] Figure 4 It is a structural diagram of the partial structure of the plunger pump;

[0023] In the figure: plunger body 1, guide rod 2, gap 3, plunger pump cylinder 4, distribution plate 5, plunger hole 6, hydraulic medium flow hole 7, hydraulic hole 8, connecting groove 9, inclined plate 10, inclined surface 11, and refueling pipe 12. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Example 1

[0026] This embodiment provides a self-returning plunger, such as Figure 1 As shown, it includes a plunger body 1, to which a guide rod 2 is connected which can move synchronously with the plunger body 1, and a gap 3 is provided between the guide rod 2 and the plunger body 1. The gap 3 is provided to facilitate the insertion of an isolation structure between the plunger body 1 and the guide rod 2, thereby ensuring that when the plunger body 1 and the guide rod 2 are inserted into the plunger pump cylinder 4, the plunger body 1 and the guide rod 2 are respectively located in two mutually isolated chambers, thereby realizing the driving of the guide rod 2.

[0027] When the present invention is used, hydraulic force acts on the push guide rod 2 to push the plunger body 1 back, so there is no need to set a return disk.

[0028] Preferably, the axis of the guide rod 2 is parallel to the axis of the plunger body 1, and the guide rod 2 is fixedly connected or integrally formed with the plunger body 1. The guide rod 2 and the plunger body 1 are arranged parallel to each other to ensure the consistency of the sliding directions of the two, and only a fixed connection or an integrally formed connection method can ensure the connection strength between the guide rod 2 and the plunger body 1.

[0029] Example 2

[0030] This embodiment provides a plunger pump, in which the self-returning plunger described in Embodiment 1 is used, combined with Figure 1-4As shown, it includes a plunger pump cylinder body 4 with a plunger hole 6 inside and a distribution plate 5, the distribution plate 5 has a hydraulic medium flow hole 7 penetrating the distribution plate 5, the plunger hole 6 is connected with the hydraulic medium flow hole 7, the plunger hole 6 is provided with a plurality of plunger holes 6, and the plunger body 1 is slidably connected in the plunger hole 6 in a one-to-one correspondence, the plunger pump cylinder body 4 is also provided with a reset hydraulic hole 8 isolated from the plunger hole 6, when the plunger body 1 is inserted into the plunger pump cylinder body 4, the isolation structure for isolating the plunger hole 6 and the reset hydraulic hole 8 is located in the gap 3, the guide rod 2 is slidably connected in the reset hydraulic hole 8, and the guide rod 2 is arranged in a one-to-one correspondence with the reset hydraulic hole 8, and also includes a connecting groove 9, and the reset hydraulic holes 8 are connected through the connecting groove 9. The connecting groove 9 and the reset hydraulic hole 8 are both filled with liquid to achieve pressure conduction, and the liquid can be hydraulic oil or other commonly used liquid media in the prior art. The swash plate 10 has a thickness that gradually increases from one end to the other. The inclined surface 11 on the swash plate 10 fits with the end of the plunger body 1 away from the distribution plate 5. Rotating the plunger pump cylinder 4 can cause the swash plate 10 to push the plunger body 1 to slide along the plunger hole 6.

[0031] In the present invention, when the plunger pump cylinder 4 is used, the plunger pump cylinder 4 is rotated to drive the plunger body 1 in the plunger pump cylinder 4 to rotate. Since the thickness of each position of the swash plate 10 at the bottom of the plunger body 1 is different, when the plunger body 1 rotates from the end with a smaller thickness to the end with a larger thickness, the inclined surface 11 will apply a pressure to the end of the plunger body 1 during the rotation process, and the plunger body 1 is further pressed into the plunger hole 6, so that the hydraulic oil is discharged through the hydraulic medium flow hole 7 on the distribution plate 5. At this time, the guide rod 2 connected to the plunger body 1 is also synchronously further extended into the reset hydraulic hole 8, and the liquid in the reset hydraulic hole 8 is squeezed into the connecting groove 9, so that the pressure in the connecting groove 9 increases, so that the liquid in the connecting groove 9 enters the reset hydraulic hole 8 on the other side, and the liquid pushes the guide rod 2 in the reset hydraulic hole 8 to slide, and partially slides to the outside of the reset hydraulic hole 8, thereby driving the plunger body 1 to partially slide to the outside of the plunger hole 6, until one end of the plunger body 1 is fitted with the inclined surface 11 and is limited, and the return stroke of the plunger body 1 is completed. During the return stroke of the plunger body 1, the hydraulic oil is sucked in through the hydraulic medium flow hole 7 on the valve plate 5 to complete the oil suction action, and this reciprocates, that is, during the rotation of the plunger pump cylinder 4, the valve plate 5 sucks oil on one side and discharges oil on the other side. Therefore, the present invention uses the connecting groove 9 and the plunger hole 6 filled with liquid and connected to each other to replace the traditional return plate to promote the return stroke of the plunger body 1.

[0032] Preferably, the communication groove 9 is located on the surface of one end of the plunger pump cylinder 4 close to the distribution plate 5, and the communication groove 9 is recessed into the plunger pump cylinder 4. Setting the communication groove 9 on the surface of the plunger pump cylinder 4 facilitates the processing of the communication groove 9 and saves production costs.

[0033] Preferably, the plunger hole 6 and the reset hydraulic hole 8 are evenly distributed along the circumference of the axis of the plunger pump cylinder 4. This can ensure the uniformity and stability of oil suction and discharge on both sides of the plunger pump.

[0034] like Figure 3 As shown, the refueling pipe 12 is also included, which is connected to the plunger pump cylinder 4 or the distribution plate 5. The refueling pipe 12 is connected to the connecting groove 9 or the plunger hole 6 through a one-way valve. The one-way valve can adopt a one-way valve structure commonly used in the prior art. The refueling pipe 12 is used to replenish liquid into the liquid system, that is, the connecting groove 9 and the plunger hole 6, which is easy to maintain after use.

[0035] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0036] Although the terms such as plunger body 1, guide rod 2, gap 3, plunger pump cylinder 4, valve plate 5, plunger hole 6, hydraulic medium flow hole 7, hydraulic hole 8, connecting groove 9, inclined plate 10, inclined surface 11, and refueling pipe 12 are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A plunger pump with a self-returning plunger, comprising a plunger pump cylinder (4) having a plunger hole (6) therein and a valve plate (5), wherein the valve plate (5) has a hydraulic medium flow hole (7) penetrating the valve plate (5), the plunger hole (6) being connected to the hydraulic medium flow hole (7), characterized in that: The plunger holes (6) are provided with a plurality of them. The self-returning plunger comprises a plunger body (1). The plunger body (1) is also connected to a guide rod (2) which can move synchronously with the plunger body (1). A gap (3) is provided between the guide rod (2) and the plunger body (1). The axis of the guide rod (2) is parallel to the axis of the plunger body (1). The guide rod (2) and the plunger body (1) are fixedly connected or integrally formed. The plunger body (1) is slidably connected in the plunger hole (6) in a one-to-one correspondence. A reset hydraulic hole (8) isolated from the plunger hole (6) is also provided in the plunger pump cylinder body (4). The guide rod (2) is slidably connected in the reset hydraulic hole (8). The guide rod (2) and the reset hydraulic hole (8) are arranged in a one-to-one correspondence. The plunger pump cylinder body (4) also comprises a connecting groove (9). The reset hydraulic holes (8) are connected through the connecting groove (9). It also includes a swash plate (10) whose thickness gradually increases from one end to the other end. The inclined surface (11) on the swash plate (10) is in contact with the end of the plunger body (1) away from the distribution plate (5). The plunger pump cylinder body (4) is rotated so that the swash plate (10) can push the plunger body (1) to slide along the plunger hole (6). The connecting groove (9) and the reset hydraulic hole (8) are filled with liquid to achieve pressure transmission.

2. The plunger pump according to claim 1, characterized in that: The communication groove (9) is located on the surface of one end of the plunger pump cylinder body (4) close to the distribution plate (5).

3. The plunger pump according to claim 1, characterized in that: The surface of one end of the plunger body (1) close to the swash plate (10) is in an arc shape.

4. The plunger pump according to claim 1, characterized in that: The plunger hole (6) and the reset hydraulic hole (8) are evenly distributed along the circumference of the axis of the plunger pump cylinder body (4).

5. The plunger pump according to claim 1, characterized in that: It also includes a refueling pipe (12) connected to the plunger pump cylinder body (4) or the distribution plate (5), and the refueling pipe (12) is connected to the communication groove (9) or the plunger hole (6) through a one-way valve.

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