High-temperature-resistant polyurethane heavy oil sealing piece

Abstract

The utility model discloses a high-temperature-resistant polyurethane heavy oil seal, which comprises a shaft and an outer ring embedded with an inner ring, the outer ring is provided with an opening which is circumferentially arranged and is used for exposing part of the outer side wall of the inner ring, the inner side wall of the inner ring is fixedly provided with a plurality of raised lines which are vertically arranged on the shaft, and the raised lines are matched with the inner side wall of the outer ring. According to the high-temperature-resistant polyurethane excessive oil sealing piece, heat of engine oil is absorbed through the protruding strips and then transmitted to the inner ring, then part of the metal sheets are exposed to dissipate the heat to the outer ring, and then the annular gap of the outer ring is used for absorbing and transmitting the heat emitted by the metal sheets on the inner ring. And finally, metal contact heat transfer is conducted on the machine body and outside air close to the machine body, the heat dissipation efficiency is improved, the oil seal has the better heat dissipation effect under the material addition, and then the high-temperature-resistant and durable effects of the oil seal are improved.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, specifically to a high-temperature resistant polyurethane multi-layer oil seal. Background Technology

[0002] Oil seals are components designed to prevent oil leakage from shafts that protrude from the machine body. They utilize the elastic lip on the oil seal to connect to the side wall of the shaft, maintaining the original transmission effect while preventing oil leakage.

[0003] According to the public announcement number: CN207584024U, the public announcement date: 2018-07-06, a multi-lip skeleton oil seal is disclosed, including an oil seal ring composed of inner and outer rings, and a skeleton is installed at the inner and outer positions, and the outer ring is provided with multiple layers of lips.

[0004] In the prior art, including the aforementioned patent, the lip of the oil seal and the shaft sidewall are constantly in contact and friction, and there is also a small amount of lubricating oil inside the oil seal. As the friction cycle is long, the temperature rise will inevitably transfer heat to the oil and gradually spread to the entire oil seal. Although the oil seal is made of high-temperature and wear-resistant material, long-term temperature effects will also cause wear to the rubber oil seal. Moreover, the shaft equipped with this type of oil seal usually needs to work for a long time. Once the oil seal is replaced due to wear and damage, the stopped shaft will inevitably affect the operation and working efficiency of the equipment. Therefore, this type of oil seal needs to be more wear-resistant and high-temperature resistant. Utility Model Content

[0005] The purpose of this invention is to provide a high-temperature resistant polyurethane multi-layer oil seal, which aims to solve the problems mentioned above.

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

[0007] A high-temperature resistant polyurethane multi-layer oil seal includes a shaft and an outer ring inlaid with an inner ring. The outer ring has a circumferentially arranged opening for exposing part of the outer wall of the inner ring.

[0008] The inner ring has multiple protrusions fixedly installed on its inner sidewall, which are arranged vertically on the shaft. The protrusions cooperate with the inner sidewall of the outer ring.

[0009] Preferably, the outer ring is provided with symmetrically arranged outer lips.

[0010] Preferably, the outer lip has equidistantly arranged annular grooves.

[0011] Preferably, the outer ring is provided with an inner lip that abuts against the shaft and is arranged opposite to the outer lip.

[0012] Preferably, a pleated protrusion located outside the convex strip is fixedly installed on the inner sidewall of the outer ring, and the pleated protrusion abuts against the sidewall of the shaft.

[0013] Preferably, the pleats cooperate with the inner lip to form a chamber for containing engine oil.

[0014] Preferably, the inner ring port is provided with a circumferentially arranged outer shell, which is embedded in the inner lip.

[0015] Preferably, a shell edge is fixedly installed at the end of the outer shell.

[0016] Preferably, the pleats are arc-shaped rubber protrusions.

[0017] Preferably, the shell edge is a flexible metal sheet.

[0018] In the above technical solution, the high-temperature resistant polyurethane multi-layer oil seal provided by this utility model has the following beneficial effects: after absorbing the heat of the oil through multiple convex strips, it is transferred to the inner ring. Then, the heat is dissipated to the outer ring by partially exposing the metal sheet. Then, the annular gap of the outer ring is used to absorb and transfer the heat emitted by the metal sheet on the inner ring. Finally, the heat is transferred to the machine body and the outside air near the machine body through metal-to-metal contact heat transfer, which accelerates the heat dissipation efficiency. This makes the oil seal have a better heat dissipation effect under the material enhancement, thereby increasing the high-temperature resistance and durability of the oil seal. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a schematic diagram of the shaft and oil seal assembly provided in an embodiment of the present utility model;

[0021] Figure 2 Exploded views of the outer and inner rings provided for embodiments of this utility model;

[0022] Figure 3 This is a partial cross-sectional view of the shaft and oil seal assembly provided in an embodiment of the present utility model;

[0023] Figure 4 A top sectional view of the outer and inner rings assembly provided for an embodiment of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Shaft; 2. Outer ring; 21. Outer lip; 22. Ring groove; 23. Inner lip; 24. Fold; 25. Opening; 3. Inner ring; 31. Outer shell; 32. Shell edge; 33. Raised strip. Detailed Implementation

[0026] 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.

[0027] like Figure 1-4 As shown, a high-temperature resistant polyurethane multi-layer oil seal includes a shaft 1 and an outer ring 2 inlaid with an inner ring 3. The outer ring 2 has a circumferentially arranged opening 25 for exposing part of the outer side wall of the inner ring 3.

[0028] Multiple protrusions 33, which are vertically arranged on the shaft 1, are fixedly installed on the inner wall of the inner ring 3. The protrusions 33 cooperate with the inner wall of the outer ring 2.

[0029] Specifically, the outer ring 2 is made of materials such as polyurethane, silicone rubber, and acrylic rubber, while the inner ring 3 is made of an alloy elastic metal sheet and serves as a skeleton when it is embedded in the outer ring 2.

[0030] Furthermore, the opening 25 is only partially covered by the annular elastic metal sheet of the inner ring 3, which blocks the opening 25. The convex strip 33 is specifically a fan-shaped elastic metal sheet, which is arranged circumferentially on the inner side wall of the inner ring 3. At the same time, the convex strip 33 is also arranged in an array in the oil in the outer ring 2.

[0031] Multiple protrusions 33 absorb heat from the oil in the outer ring 2, and the heat from the protrusions 33 is transmitted to the annular metal sheet of the inner ring 3. Then, the heat is dissipated to the outer wall of the outer ring 2 by partially exposing the metal sheet. An annular gap is left between the outer wall of the outer ring 2 and the machine body. The purpose of the gap is to absorb and transfer the heat emitted by the metal sheet on the inner ring 3. Finally, the heat is transferred to the machine body and the outside air near the machine body through metal-to-metal contact heat transfer, which accelerates the heat dissipation efficiency. This makes the oil seal have a better heat dissipation effect with the addition of materials, thereby increasing the high temperature resistance and durability of the oil seal.

[0032] As a further embodiment of this utility model, the outer ring 2 is provided with symmetrically arranged outer lips 21.

[0033] Specifically, the outer lip 21 is located on both sides of the annular gap on the outer side wall of the outer ring 2.

[0034] The two outer lips 21 are used to make contact with the body, which ensures the stability of the contact between the shaft 1 and the body, and also plays a certain role in heat transfer and ensures the formation of the annular gap.

[0035] As another embodiment provided by this utility model, the outer lip 21 is provided with equidistantly arranged annular grooves 22.

[0036] The protrusions between adjacent annular grooves 22 create a multi-layered barrier effect, which aims to enhance the connection and protection between the oil seal and the machine body.

[0037] As another embodiment further provided by this utility model, an inner lip 23 is provided on the outer ring 2, which abuts against the shaft 1 and is arranged opposite to the outer lip 21.

[0038] The inner lip 23, which is symmetrically arranged and has a figure-eight cross section, ensures the sliding effect of contact with shaft 1, while also increasing the difficulty of external dirt seeping in and the ability to prevent oil leakage.

[0039] As a further embodiment of this utility model, a pleated protrusion 24 located outside the protrusion 33 is fixedly installed on the inner side wall of the outer ring 2, and the pleated protrusion 24 abuts against the side wall of the shaft 1.

[0040] Specifically, the protrusion 33 is embedded in the folded protrusion 24, and the inner diameter end of the folded protrusion 24 maintains a predetermined angle with the shaft 1 by default.

[0041] The multiple pleats 24 provide multiple barriers, which can reduce the difficulty of further intrusion of external dirt, block the flow of oil between the two inner lips 23, reduce oil flow and increase heat generation, and allow more heat in the oil to be transferred to the ridges 33 through the pleats 24.

[0042] As another embodiment further provided in this utility model, the pleat 24 cooperates with the inner lip 23 to form a chamber for containing engine oil.

[0043] The triangular cavity formed between the convex 24 and the inner lip 23 allows the oil in this area to be the first to absorb external dirt, reducing the likelihood of dirt penetrating deeper.

[0044] As a further embodiment of this utility model, the inner ring 3 port is provided with a circumferentially arranged outer shell 31, which is embedded in the inner lip 23.

[0045] Specifically, the outer shell 31 is located between adjacent circumferential folds 24.

[0046] The outer shell 31 provides enhanced protection for the outer side of the pleats 24, serving as a shield for the skeleton. At the same time, when the shaft 1 moves radially, the outer shell 31 can also be compressed to counteract the radial movement of the shaft 1. During the process, the inner diameter of the multiple pleats 24 is also compressed and deformed, and is buffered by the skeleton effect of the multiple ridges 33, reducing the pressure damage to the oil seal.

[0047] As another embodiment of this utility model, a shell edge 32 is fixedly installed at the end of the outer shell 31.

[0048] The shell edge 32 deforms when compressed, which facilitates elastic cushioning when combined with the pleats 24.

[0049] As another embodiment further provided in this utility model, the pleat 24 is specifically an arc-shaped rubber protrusion.

[0050] The rubber pleats 24 make it more deformable, and the deflection on the other side is aggravated after deformation (the deflection on the other side is reduced), thereby increasing the contact surface with the shaft 1, while also ensuring the oil seal's blocking effect on the engine oil.

[0051] As another embodiment further provided in this utility model, the shell edge 32 is specifically an elastic metal sheet.

[0052] The use of elastic metal material makes the shell edge 32 more deformable, making the shell edge 32 more responsive and improving the cushioning efficiency during the cushioning process.

[0053] Working principle: Multiple protrusions 33 absorb heat from the oil in the outer ring 2, and the heat from the protrusions 33 is transmitted to the annular metal sheet of the inner ring 3. Then, the heat is dissipated to the outer wall of the outer ring 2 by partially exposing the metal sheet. An annular gap is left between the outer wall of the outer ring 2 and the body. The purpose of the gap is to absorb and transfer the heat emitted by the metal sheet on the inner ring 3. Finally, the heat is transferred to the body and the outside air near the body through metal-to-metal contact heat transfer, which accelerates the heat dissipation efficiency.

[0054] 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 high-temperature resistant polyurethane multi-layer oil seal, comprising a shaft (1), characterized in that, It also includes an outer ring (2) inlaid with an inner ring (3), wherein the outer ring (2) has a circumferentially arranged opening (25) for exposing part of the outer wall of the inner ring (3); The inner ring (3) has a plurality of protrusions (33) that are vertically arranged on the shaft (1) fixedly installed on the inner side wall, and the protrusions (33) cooperate with the inner side wall of the outer ring (2).

2. The high-temperature resistant polyurethane multi-layer oil seal according to claim 1, characterized in that, The outer ring (2) is provided with symmetrically arranged outer lips (21).

3. The high-temperature resistant polyurethane multi-layer oil seal according to claim 2, characterized in that, The outer lip (21) is provided with equidistantly arranged annular grooves (22).

4. The high-temperature resistant polyurethane multi-layer oil seal according to claim 2, characterized in that, The outer ring (2) is provided with an inner lip (23) that abuts against the shaft (1) and is arranged opposite to the outer lip (21).

5. A high-temperature resistant polyurethane multi-layer oil seal according to claim 4, characterized in that, The inner wall of the outer ring (2) is fixedly installed with a pleated protrusion (24) located outside the protrusion (33), and the pleated protrusion (24) abuts against the side wall of the shaft (1).

6. A high-temperature resistant polyurethane multi-layer oil seal according to claim 5, characterized in that, The pleats (24) cooperate with the inner lip (23) to form a chamber for containing engine oil.

7. A high-temperature resistant polyurethane multi-layer oil seal according to claim 5, characterized in that, The inner ring (3) port is provided with a circumferentially arranged outer shell (31), which is embedded in the inner lip (23).

8. A high-temperature resistant polyurethane multi-layer oil seal according to claim 7, characterized in that, The outer shell (31) is fixedly mounted with a shell edge (32) at its end.

9. A high-temperature resistant polyurethane multi-layer oil seal according to claim 7, characterized in that, The pleats (24) are specifically arc-shaped rubber protrusions.

10. A high-temperature resistant polyurethane multi-layer oil seal according to claim 8, characterized in that, The shell edge (32) is specifically an elastic metal sheet.

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