A pressure difference balanced self-rotating speed regulating plunger structure

Abstract

The present invention discloses a pressure difference balance type self-rotating speed regulating plunger structure, wherein the plunger is processed with at least one layer of annular first pressure chamber, and a boost pressure rubber pad is installed in each layer of the first pressure chamber; each first pressure chamber is connected through an axial through hole, and one first pressure chamber is connected to the inner hole of the plunger through a radial through hole, and the oil in the inner hole of the plunger is directly conducted to the first pressure chamber through the radial through hole; the plunger is also processed with a second pressure chamber connected to the first pressure chamber, and an arc-shaped wall flow channel with a rotation direction is processed from the second pressure chamber to the wall of the plunger, and a pressure sensing valve plate is installed at the inlet where the first pressure chamber is connected to the radial through hole and the inlet where the second pressure chamber is connected to the first pressure chamber. The present invention can provide a supporting pressure after boosting in the hollow pressure chamber in the plunger, so that the plunger can also move stably after moving to the low-pressure area, reduce the wear of the plunger, and increase the service life of the plunger pump.

Description

Technical Field

[0001] The invention relates to a swash plate type axial piston pump structure, in particular to a pressure difference balance type self-rotating speed regulating piston structure. Background Art

[0002] The plunger structure of the inclined plate axial piston pump reciprocates in the plunger cavity. When passing through the high-pressure area, the plunger cavity is filled with high-pressure oil. At this time, the pressure difference at both ends of the plunger auxiliary oil film is large, and the bearing capacity of the pressure oil film is strong, which can ensure the stable movement of the plunger in the cavity. When the plunger passes through the low-pressure area, the plunger cavity is filled with low-pressure oil. The pressure difference at both ends of the plunger auxiliary oil film cannot construct a complete pressure oil film, which will cause the plunger to have rigid contact with the cavity wall and wear, directly affecting the service life of the plunger pump. To this end, the present invention proposes a pressure difference balanced self-rotating speed regulating plunger structure, which can realize the oil film pressurization of the plunger in the low-pressure area, improve the bearing characteristics of the plunger pair, and increase the service life of the pump. Summary of the invention

[0003] Aiming at the problem of insufficient oil film bearing capacity of the plunger in the low-pressure area during the flow distribution process of the slant plate plunger pump, the present invention proposes a pressure difference balance type self-rotating speed regulating plunger structure, and the specific technical solution is as follows:

[0004] A pressure difference balanced self-rotating speed regulating plunger structure comprises a plunger, a ball head structure and a sliding shoe, wherein the plunger is hingedly connected to the sliding shoe through the ball head structure, and an axially penetrating plunger inner hole is processed in the plunger;

[0005] The plunger is processed with at least one layer of annular first pressure chambers, and a boost pressure rubber pad is installed in each layer of the first pressure chambers; each of the first pressure chambers is connected through an axial through hole; one of the first pressure chambers is connected to the plunger inner hole through a radial through hole, and the oil in the plunger inner hole is directly conducted to the first pressure chamber through the radial through hole;

[0006] A second pressure chamber corresponding to the first pressure chamber is also formed in the plunger, and an arc-shaped wall flow channel with a rotation direction is formed from the second pressure chamber to the wall of the plunger, and the wall flow channels are evenly distributed with the second pressure chamber as the center;

[0007] A first pressure-sensing valve plate is installed at the inlet of the first pressure chamber communicating with the radial through hole, and a second pressure-sensing valve plate is installed at the inlet of the second pressure chamber communicating with the first pressure chamber.

[0008] Furthermore, the apertures of the wall flow channels in the same layer are the same.

[0009] Furthermore, the rotation directions of the wall flow channels of two adjacent layers are opposite.

[0010] Furthermore, the pressure-sensitive valve disc 1 and the pressure-sensitive valve disc 2 both include a valve disc and a spring, and the valve disc is fixed in the corresponding cavity by the spring.

[0011] Furthermore, the structure is manufactured by 3D printing.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. It can provide the supporting pressure after pressurization in the hollow pressure chamber in the plunger, so that the plunger can move stably after moving to the low-pressure area, reducing the wear of the plunger and increasing the service life of the plunger pump.

[0014] 2. The present invention can ensure that the auxiliary oil film of the plunger has sufficient oil film support force in the low-pressure area, thereby improving the stability of the plunger movement.

[0015] 3. By adopting the present invention, the plunger structure can be hollowed out to achieve lightweighting of the plunger structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 This is the plunger structure diagram.

[0018] Figure 2 It is the front view of the plunger structure.

[0019] Figure 3 for Figure 2 EE cross-section diagram.

[0020] Figure 4 for Figure 2 Cross-sectional view of CC and DD in FIG.

[0021] In the figure, the plunger 1, the ball head structure 2, the sliding shoe 3, the first pressure chamber 4, the boost pressure rubber pad 5, the second pressure chamber 6, the wall flow channel 7, the axial through hole 8, the radial through hole 9, the plunger inner hole 10, the pressure sensing valve plate 1 11, the pressure sensing valve plate 2 12, the plunger cavity 13, and the plunger cavity guide sleeve 14. DETAILED DESCRIPTION

[0022] The present invention is further described below with reference to the accompanying drawings and specific examples. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned in the text.

[0023] like Figure 1 and Figure 2 As shown, a pressure difference balanced self-rotating speed regulating plunger structure comprises a plunger 1, a ball head structure 2, and a sliding shoe 3. The plunger 1 is hingedly connected to the sliding shoe 3 via the ball head structure 2.

[0024] The plunger 1 is provided with an inner plunger hole 10 which is axially through. Figure 3 As shown, the plunger 1 is processed with at least one layer of annular first pressure chamber 4, and a boost pressure rubber pad 5 is installed in each layer of the first pressure chamber 4; each first pressure chamber 4 is connected through an axial through hole 8; one of the first pressure chambers 4 is connected to the plunger inner hole 10 through a radial through hole 9, and the oil in the plunger inner hole 10 can be directly conducted to the first pressure chamber 4 through the radial through hole 9. The plunger 1 is also processed with a second pressure chamber 6 corresponding to the first pressure chamber 4, and a wall flow channel 7 is processed from the second pressure chamber 6 to the wall of the plunger 1, as shown in FIG. Figure 4 As shown, the wall flow channel 7 is evenly distributed with the second pressure chamber 6 as the center, and is an arc-shaped flow channel with a rotation direction. A pressure-sensing valve plate 11 is installed at the entrance of the first pressure chamber 4 connected to the radial through hole 9. Its function is to open under the action of pressure when the plunger 1 moves to the high-pressure area, so that the high-pressure oil can enter the first pressure chamber 4. A pressure-sensing valve plate 2 12 is installed at the entrance of the second pressure chamber 6 connected to the first pressure chamber 4. When the plunger 1 moves to the low-pressure area, the pressure-sensing valve plate 1 11 is closed. At this time, the first pressure chamber 4 is under high pressure, while the plunger pair is under low pressure. Therefore, the pressure-sensing valve plate 2 12 is opened, and the high-pressure oil is conducted to the plunger cavity 13 of the plunger 1 through the wall flow channel 7, so that a high support effect can be maintained when moving in the low-pressure area.

[0025] The plunger cavity 13 is the movement space of the plunger 1. A plunger cavity guide sleeve 14 is processed between the plunger 1 and the plunger cavity 13, and a buffer flow channel distributed with the wall flow channel 7 is processed on its surface to avoid pressure shock caused by accumulation on the wall when high-pressure oil flows out.

[0026] The rotation direction and aperture of the wall flow channels 7 corresponding to each layer can be set as needed to achieve the balance of the plunger rotation. Preferably, the apertures of the wall flow channels 7 in the same layer are the same. The rotation directions of the wall flow channels 7 of two adjacent layers are opposite.

[0027] The boost pressure rubber pad 5 can achieve the setting of the pre-compression force of the pressure chamber by changing the elastic modulus of the rubber pad. The pressure sensing valve plate 1 11 and the pressure sensing valve plate 2 12 both include valve plates and springs, and the valve plates are fixed in the corresponding chambers by the springs.

[0028] The plunger structure of this embodiment can be manufactured by 3D printing.

[0029] Depend on Figure 4 It can be seen that by changing the rotation direction and aperture of the wall flow channel 7, the oil pressure difference and flow rate at the flow channel outlet can be changed, thereby realizing the control of the plunger rotation speed; by staggered distribution of clockwise and counterclockwise wall flow channels, the imbalance of the plunger movement caused by the wall flow channel jet can be better balanced.

[0030] The flow rate calculation of the wall flow channel adopts the flow rate formula of small hole gap flow:

[0031] q_V=C_Q A√(2 / ρ)Δp

[0032] Among them, q_V is the outlet flow rate of the small hole; C_Q is the flow coefficient; A is the aperture area; ρ is the oil density; Δp is the pressure difference between the two ends of the small hole;

[0033] It can be seen that q_V is related to the aperture of the wall flow channel and the pressure difference at both ends. The force exerted by the wall flow channel fluid on the plunger is F=Δp(q_V*vcosα), where F is the flow channel fluid force, Δp is the pressure difference at both ends of the small hole, q_V is the small hole outlet flow rate, v is the oil flow rate, and α is the incident angle.

[0034] It can be seen that when a certain flow of oil flows out of the small hole, it will exert a force on the structure. In the present invention, this fluid force is used to balance the rotational motion of the speed-regulating plunger.

[0035] The present invention can achieve a balance in the movement of the plunger in the cavity, so that when the plunger moves to the low-pressure area, it can still maintain a high oil film bearing capacity. At the same time, by adjusting the wall flow channel in the plunger cavity, a fluid force opposite to the plunger's rotation is provided, so that the plunger can move at a uniform speed under the support of the plunger auxiliary oil film.

[0036] Those skilled in the art can understand that the above are only preferred examples of the invention and are not intended to limit the invention. Although the invention is described in detail with reference to the above examples, those skilled in the art can still modify the technical solutions recorded in the above examples or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, etc. made within the spirit and principle of the invention shall be included in the protection scope of the invention.

Claims

1. A pressure difference balanced self-rotating speed regulating plunger structure, characterized in that: The invention comprises a plunger (1), a ball head structure (2) and a sliding shoe (3); the plunger (1) is hingedly connected to the sliding shoe (3) via the ball head structure (2); and a plunger inner hole (10) penetrating along the axial direction is processed in the plunger (1); The plunger (1) is processed with at least one layer of annular first pressure chambers (4), and a boost pressure rubber pad (5) is installed in each layer of the first pressure chambers (4); each of the first pressure chambers (4) is connected through an axial through hole (8); one of the first pressure chambers (4) is connected to the plunger inner hole (10) through a radial through hole (9), and the oil in the plunger inner hole (10) is directly conducted to the first pressure chamber (4) through the radial through hole (9); The plunger (1) is further provided with a second pressure chamber (6) corresponding to and communicating with the first pressure chamber (4), and a wall flow channel (7) with a rotational arc is provided between the second pressure chamber (6) and the wall surface of the plunger (1), and the wall flow channel (7) is evenly distributed with the second pressure chamber (6) as the center; A pressure-sensitive valve plate 1 (11) is installed at the entrance of the first pressure chamber (4) communicating with the radial through hole (9), and a pressure-sensitive valve plate 2 (12) is installed at the entrance of the second pressure chamber (6) communicating with the first pressure chamber (4).

2. The pressure difference balanced self-rotating speed regulating plunger structure according to claim 1 is characterized in that: The apertures of the wall flow channels (7) in the same layer are the same.

3. The pressure difference balanced self-rotating speed regulating plunger structure according to claim 1, characterized in that: The rotation directions of the wall flow channels (7) of two adjacent layers are opposite.

4. The pressure difference balanced self-rotating speed regulating plunger structure according to claim 1, characterized in that: The pressure-sensitive valve plate 1 (11) and the pressure-sensitive valve plate 2 (12) both include valve plates and springs, and the valve plates are fixed in corresponding cavities by the springs.

5. The pressure difference balanced self-rotating speed regulating plunger structure according to claim 1, characterized in that: The structure was manufactured using 3D printing.

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