A pressure-resistant and wear-resistant polyurethane multi-layer oil seal for non-circular ports

Abstract

This utility model discloses a pressure-resistant and wear-resistant polyurethane multi-layer oil seal for non-circular ports, specifically relating to a sealing element, including a ring with an inclined surface facing the oil. The higher portion of the inclined surface is located on the outer ring of the ring, while the lower portion is located near the inner ring. The inner ring of the ring has a protrusion, the top of which is a beveled edge. This utility model reduces the impact force of the oil through the inclined surface and reduces frictional heat generation through the beveled edge contact, thus ensuring both the elasticity and sealing performance of the oil seal.

Description

Technical Field

[0001] This utility model relates to sealing components, specifically to a pressure-resistant and wear-resistant polyurethane multi-layer oil seal for non-circular ports. Background Technology

[0002] The oil seal (usually referring to the piston rod seal) on a hydraulic hammer is the core sealing component, and its function is to prevent hydraulic oil from leaking through the gap between the piston rod and the cylinder. Furthermore, it must maintain the integrity of the seal during the high-frequency reciprocating motion of the piston rod (speed ≥1m / s).

[0003] Referring to Chinese Patent Publication No. CN222140171U, a hydraulic breaker is disclosed, which includes a cylinder body and a piston movable within the cylinder body. The cylinder body has a high-pressure chamber and an oil seal, and also includes a lower low-pressure chamber located between the high-pressure chamber and the oil seal. The cylinder body is also equipped with a return oil pressure control valve. The lower low-pressure chamber is connected to the valve chamber of the return oil pressure control valve through a return oil channel, and the valve chamber of the return oil pressure control valve is connected to the upper low-pressure chamber through the return oil channel. This invention, under the action of the lower low-pressure chamber, can maintain a certain pressure, ensuring the formation of a pressurized oil film between the high-pressure chamber and the seal. Through the action of the oil film, when the piston vibrates and deviates during high-speed downward impact on the chisel, the risk of contact between the piston and the cylinder body is reduced, thereby reducing the probability of scratches on the piston and cylinder body.

[0004] In the prior art, including the aforementioned patent, under high-speed piston movement, heat is generated due to the repeated movement of the piston body and friction with the seal. Additionally, the oil temperature rises and its hardness decreases under piston movement. The impact force on the seal generated by the piston movement also affects the oil seal. Over time, the oil seal's sealing performance decreases, and the amount of oil leakage increases with the service life. Utility Model Content

[0005] The purpose of this invention is to provide a pressure-resistant and wear-resistant polyurethane multi-layer oil seal for non-circular ports to solve the above-mentioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A pressure-resistant and wear-resistant polyurethane multi-layer oil seal for a non-circular port includes a ring with an inclined surface facing the oil body. The high part of the inclined surface is distributed on the outer ring of the ring, while the low part is distributed near the inner ring of the ring.

[0008] The inner ring of the ring is provided with a protrusion, and the top of the protrusion is a beveled edge.

[0009] Preferably, the ring is an injection molded part.

[0010] Preferably, the ring is a rounded rectangular structure.

[0011] Preferably, the number of protrusions is not less than two, and they are all distributed adjacent to the inclined surface.

[0012] Preferably, the side of the protrusion facing the inclined surface is a sloped surface.

[0013] Preferably, the side of the protrusion away from the inclined surface is a recess.

[0014] Preferably, one of the protrusions is located at the center point of the ring.

[0015] Preferably, the ring is any one of polyurethane, nitrile rubber, and hydrogenated nitrile rubber.

[0016] In the above technical solution, the pressure-resistant and wear-resistant polyurethane multi-layer oil seal for non-circular ports provided by this utility model has the following beneficial effects: when the piston is running, the oil impacts the inclined surface, and under the guidance, the oil flows from the outer ring of the ring towards the inner ring of the ring, thereby reducing the impact force of the oil impacting the side of the ring when the piston is running.

[0017] Secondly, the inner ring of the ring is a raised part, and its contact surface with the piston is the edge of the beveled part, thereby reducing the contact surface with the piston and reducing the heat accumulation caused by friction, so as to avoid loss of elasticity and reduced oil seal performance due to overheating of the raised part. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model;

[0020] Figure 2 This is a cross-sectional structural diagram provided for an embodiment of the present utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Ring; 2. Inclined surface; 3. Protrusion; 31. Sloping surface; 32. Recess; 4. Sloping edge. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0024] like Figure 1-2 As shown, a pressure-resistant and wear-resistant polyurethane multi-layer oil seal for a non-circular port includes a ring 1 with an inclined surface 2 facing the oil body. The high position of the inclined surface 2 is distributed on the outer ring of the ring 1, while the low position is distributed close to the inner ring of the ring 1.

[0025] The inner ring of the ring 1 is provided with a protrusion 3, and the top of the protrusion 3 is a beveled blade 4.

[0026] Specifically, the ring 1 is injection molded from any one of polyurethane, nitrile rubber, and hydrogenated nitrile rubber, and it has a rounded rectangular structure.

[0027] When the piston is running, the oil impacts the inclined surface 2. Under the guidance, the oil flows from the outer ring of the ring 1 towards the inner ring of the ring 1, thereby reducing the impact force of the oil on the side of the ring 1 when the piston is running.

[0028] Secondly, the inner ring of the ring 1 is a protrusion 3, and its contact surface with the piston is the cutting edge of the inclined blade 4, thereby reducing the contact surface with the piston and reducing the heat accumulation caused by friction, so as to avoid loss of elasticity and reduced oil seal sealing due to overheating of the protrusion 3.

[0029] As a further embodiment of this utility model, combined with Figure 2 As shown, there are at least two protrusions 3, and they are distributed adjacent to each other on the slope 2. The side of the protrusions 3 facing the slope 2 is the slope portion 31, while the side of the protrusions 3 away from the slope 2 is the depression portion 32.

[0030] It should be noted that one of the protrusions 3 is located at the center point of the ring 1.

[0031] Specifically, in this embodiment, when the piston is in operation, the oil on the piston scrapes against the inclined blade 4, and the scraped oil flows down the slope 31 to a lower position on the inclined surface 2. The recessed portion 32 increases the structural stiffness by increasing the moment of inertia of the cross section.

[0032] Secondly, the two protrusions 3 added in the embodiment are intended to eliminate the risk of back pressure leakage caused by oil retention.

[0033] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pressure-resistant and wear-resistant polyurethane multi-layer oil seal for a non-circular port, characterized in that, It includes a ring (1) with a slope (2) facing the oil body. The high position of the slope (2) is located on the outer ring of the ring (1), while the low position is located near the inner ring of the ring (1). The inner ring of the ring (1) is provided with a protrusion (3), and the top of the protrusion (3) is a beveled blade (4).

2. The pressure-resistant and wear-resistant polyurethane multi-layer oil seal for a non-circular port according to claim 1, characterized in that, The ring (1) is an injection molded part.

3. The pressure-resistant and wear-resistant polyurethane multi-layer oil seal for a non-circular port according to claim 1, characterized in that, The ring (1) is a rounded rectangular structure.

4. A pressure-resistant and wear-resistant polyurethane multi-layer oil seal for a non-circular port according to claim 1, characterized in that, The number of protrusions (3) is not less than two, and they are all distributed adjacent to the inclined surface (2).

5. A pressure-resistant and wear-resistant polyurethane multi-layer oil seal for a non-circular port according to claim 1, characterized in that, The protrusion (3) facing the inclined surface (2) is a slope surface (31).

6. A pressure-resistant and wear-resistant polyurethane multi-layer oil seal for a non-circular port according to claim 1, characterized in that, The protrusion (3) is recessed (32) on the side away from the inclined surface (2).

7. A pressure-resistant and wear-resistant polyurethane multi-layer oil seal for a non-circular port according to claim 4, characterized in that, One of the protrusions (3) is located at the center point of the ring (1).

8. A pressure-resistant and wear-resistant polyurethane multi-layer oil seal for a non-circular port according to claim 1, characterized in that, The ring (1) is any one of polyurethane, nitrile rubber and hydrogenated nitrile.

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