Noise reduction valve plate of axial plunger pump

Abstract

The invention discloses a noise reduction valve plate of an axial plunger pump. The noise reduction valve plate comprises a valve plate body, an oil absorption kidney-shaped groove, an oil discharge kidney-shaped groove, a triangular unloading groove, a first throttling hole, a second throttling hole and a shaft hole. A shaft hole is coaxially formed in the center of the valve plate body, an oil absorption kidney-shaped groove and an oil discharge kidney-shaped groove which are isolated from each other are formed in the two sides of the shaft hole, and a high-pressure transition area and a low-pressure transition area are formed between the two kidney-shaped grooves. The oil discharge kidney-shaped groove comprises three independent small kidney-shaped grooves, and every two adjacent small kidney-shaped grooves are connected through a reinforcing rib. A first throttling hole and a second throttling hole which are different in diameter are formed in the side, close to the oil suction kidney-shaped groove, of the low-pressure transition area. A triangular unloading groove is formed in the side, close to the high-pressure transition area, of the oil discharging kidney-shaped groove and comprises two triangular grooves with different depth angles. The flow speed of flowing liquid flowing into the oil discharge kidney-shaped groove is reduced, the impact on oil liquid in the oil suction kidney-shaped groove is reduced, and noise is reduced.

Description

Technical Field

[0001] The invention relates to the field of axial piston pumps, and in particular to a noise-reducing distribution plate for axial piston pumps. Background Art

[0002] As one of the key components of the axial piston pump, the valve plate is used to absorb and discharge oil during the operation of the piston pump. The oil suction area and oil discharge area of ​​the valve plate are separated from each other. There is a high-pressure transition area and a low-pressure transition area between the oil suction area and the oil discharge area. When the cylinder body rotates and reaches the high-pressure transition area after the oil suction from the low-pressure chamber (oil suction waist groove) is completed, the cylinder plunger cavity forms a closed working chamber in the high-pressure transition area. The oil inside will be compressed instantly to produce pressure shock. Excessive pressure in the plunger cavity will stimulate noise. At this time, it is necessary to design a unloading groove in the transition area to reduce pressure shock. When the cylinder body moves from the high-pressure chamber (oil discharge waist groove) to the low-pressure transition area after the oil discharge, the closed chamber will be compressed instantly to produce high pressure again. When the cylinder body moves to the oil suction waist groove, the high-pressure oil in the plunger cavity will impact the oil in the low-pressure area, causing large flow pulsation and generating large noise.

[0003] There are two main methods for reducing the noise of the distribution plate on the market: (1) using a triangular groove with a depth angle in each of the high- and low-pressure transition zones of the distribution plate; (2) using a triangular groove with a depth angle in the high-pressure zone and a conventional damping hole structure in the low-pressure zone. In practice, the effect of using a structure with a depth angle in the high-pressure zone to reduce flow pulsation is not obvious. In the low-pressure transition zone, a triangular groove with a depth angle is used. Since the tip of the triangular groove has a small flow area, the high-pressure oil in the plunger cavity will quickly enter to form a high-pressure jet. Due to the high flow rate, it will impact the surface of the distribution plate and cause local cavitation. Therefore, the noise reduction effect of the above two methods is not obvious. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention proposes a noise-reducing distribution plate for an axial piston pump, which can reduce pressure shock and flow pulsation, and reduce the occurrence of cavitation.

[0005] The specific technical solutions are as follows:

[0006] A noise reduction valve plate for an axial piston pump, comprising: a valve plate body, an oil suction waist-shaped groove, an oil discharge waist-shaped groove, a triangular unloading groove, a throttle hole 1, a throttle hole 2, and an axial hole;

[0007] An axial hole is coaxially opened at the center of the distribution plate body, and mutually isolated oil suction waist-shaped groove and oil discharge waist-shaped groove are opened on both sides of the axial hole, and a high-pressure transition zone and a low-pressure transition zone are formed between the two waist-shaped grooves; the oil discharge waist-shaped groove includes three independent small waist-shaped grooves, and two adjacent small waist-shaped grooves are connected by reinforcing ribs;

[0008] The low-pressure transition zone is provided with two throttling holes 1 and 2 with different diameters on one side close to the oil-absorbing waist-shaped groove;

[0009] A triangular unloading groove is provided on one side of the oil-draining waist-shaped groove close to the high-pressure transition zone, and the triangular unloading groove includes two triangular grooves with different depth angles.

[0010] Furthermore, a mounting hole is provided on the back side of the distribution plate body for mounting on an axial piston pump.

[0011] Furthermore, the wrap angle of the oil absorption waist-shaped groove is 128°, the wrap angle of the oil discharge waist-shaped groove is 128°, and the wrap angles of the three small waist-shaped grooves in the oil discharge waist-shaped groove are 29°, 35°, and 29° respectively.

[0012] Furthermore, the diameter of the throttle hole 1 is 0.8 mm, and the diameter of the throttle hole 2 is 1.2 mm.

[0013] Furthermore, the first triangular groove has a depth angle of 4.5°, a width angle of 60°, and a length of 8 mm; the second triangular groove has a depth angle of 34°, a width angle of 60°, and a length of 2.9 mm.

[0014] The beneficial effects of the present invention are:

[0015] The present invention opens a triangular unloading groove on one side of the oil discharge waist-shaped groove close to the high-pressure transition zone, and the triangular unloading groove includes two triangular grooves with different depth angles. Compared with a triangular groove with only one depth angle, the flow pulsation is more stable and the noise is reduced; two throttling holes with different diameters are opened on one side of the low-pressure transition zone close to the oil suction waist-shaped groove, which reduces the impact on the oil in the oil suction waist-shaped groove and further reduces the noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of the noise reduction distribution plate of the axial piston pump in an embodiment of the present invention.

[0017] Figure 2 It is a rear view of the noise reduction distribution plate of the axial piston pump in the embodiment of the present invention.

[0018] Figure 3 It is an AA cross-sectional view of the noise reduction distribution plate of the axial piston pump in an embodiment of the present invention.

[0019] Figure 4 In the embodiment of the present invention Figure 3 BB cross-sectional view.

[0020] Figure 5 In the embodiment of the present invention Figure 3 CC cross-sectional view.

[0021] In the figure, the distribution plate body 1, the oil suction waist-shaped groove 2, the oil discharge waist-shaped groove 3, the triangular unloading groove 4, the throttling hole 1 5, the throttling hole 2 6, the shaft hole 7, the reinforcing rib 8, and the mounting hole 9. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below according to the accompanying drawings and preferred embodiments, and the purpose and effect of the present invention will become more clear. The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] like Figure 1 , Figure 2 As shown, a noise reduction distribution plate for an axial piston pump includes: a distribution plate body 1, an oil suction waist-shaped groove 2, an oil discharge waist-shaped groove 3, a triangular unloading groove 4, a throttle hole 1 5, a throttle hole 2 6, an axial hole 7, a reinforcing rib 8, and a mounting hole 9.

[0024] An axial hole 7 is coaxially provided at the center of the distribution plate body 1 for the main shaft of the plunger pump to pass through; a mounting hole 9 is provided at the back edge of the distribution plate body 1 for mounting the distribution plate on the axial piston pump. On both sides of the axial hole 7, there are oil suction waist-shaped grooves 2 and oil discharge waist-shaped grooves 3 that are isolated from each other. The oil suction waist-shaped groove 2 passes through the distribution plate body 1, and the oil discharge waist-shaped groove 3 is composed of three independent small waist-shaped grooves, and the adjacent two small waist-shaped grooves are connected by reinforcing ribs. In this embodiment, the wrap angle of the oil suction waist-shaped groove 2 is 128°, the wrap angle of the oil discharge waist-shaped groove 3 is 128°, and the wrap angles of the three small waist-shaped grooves in the oil discharge waist-shaped groove 3 are 29°, 35°, and 29° respectively. A high-pressure transition zone and a low-pressure transition zone are formed between the oil suction waist-shaped groove 2 and the oil discharge waist-shaped groove 3. It should be noted that in the distribution plate of the plunger pump, the waist-shaped groove is by default a through hole that passes through the distribution plate body 1 axially.

[0025] Two throttling holes 1 5 and throttling holes 2 6 of different diameters are provided on one side of the low-pressure transition zone near the oil suction waist-shaped groove 2, which are used to introduce the remaining high-pressure oil in the plunger cavity into the shell, reduce the impact on the oil in the oil suction waist-shaped groove 2 and the cavitation on the surface of the distribution plate, and further reduce the noise; in this embodiment, the diameter of the throttling hole 1 5 is 0.8 mm, and the diameter of the throttling hole 2 6 is 1.2 mm.

[0026] like Figure 3-Figure 5The oil discharge waist-shaped groove 3 shown is provided with a triangular unloading groove 4 on one side close to the high-pressure transition zone. The triangular unloading groove 4 is composed of two triangular grooves with different depth angles. In this embodiment, the first triangular groove has a depth angle of 4.5°, a width angle of 60°, and a length of 8mm; the second triangular groove has a larger depth angle. In this embodiment, the depth angle is 34°, the width angle is 60°, and the length is 2.9mm. This design can increase the flow area of ​​the high-pressure transition zone at the triangular unloading groove 4, so that the flow velocity of the liquid flowing into the oil discharge waist-shaped groove 3 is smoother, the flow pulsation is smaller, and the noise is reduced.

[0027] 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 noise reduction valve plate for an axial piston pump, characterized in that: include: Distribution plate body, oil suction waist-shaped groove, oil discharge waist-shaped groove, triangular unloading groove, throttle hole 1, throttle hole 2, shaft hole; An axial hole is coaxially opened at the center of the distribution plate body, and mutually isolated oil suction waist-shaped groove and oil discharge waist-shaped groove are opened on both sides of the axial hole, and a high-pressure transition zone and a low-pressure transition zone are formed between the two waist-shaped grooves; the oil discharge waist-shaped groove includes three independent small waist-shaped grooves, and two adjacent small waist-shaped grooves are connected by reinforcing ribs; The low-pressure transition zone is provided with two throttling holes 1 and 2 with different diameters on one side close to the oil-absorbing waist-shaped groove; A triangular unloading groove is provided on one side of the oil-draining waist-shaped groove close to the high-pressure transition zone, and the triangular unloading groove includes two triangular grooves with different depth angles.

2. The noise reduction valve plate of the axial piston pump according to claim 1, characterized in that: The back side of the distribution plate body is provided with a mounting hole for mounting on an axial piston pump.

3. The noise reduction valve plate of the axial piston pump according to claim 1, characterized in that: The wrap angle of the oil-absorbing waist-shaped groove is 128°, the wrap angle of the oil-discharging waist-shaped groove is 128°, and the wrap angles of the three small waist-shaped grooves in the oil-discharging waist-shaped groove are 29°, 35°, and 29° respectively.

4. The noise reduction valve plate for an axial piston pump according to claim 1, characterized in that: The diameter of the throttle hole 1 is 0.8 mm, and the diameter of the throttle hole 2 is 1.2 mm.

5. The noise reduction valve plate for an axial piston pump according to claim 1, characterized in that: The first triangular groove has a depth angle of 4.5°, a width angle of 60°, and a length of 8 mm; the second triangular groove has a depth angle of 34°, a width angle of 60°, and a length of 2.9 mm.

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