An adjustable pressure-resistant oil seal

Abstract

The present invention discloses an adjustable pressure-resistant oil seal, which belongs to the technical field of sealing equipment, and comprises a sealing body, wherein the sealing body is provided with a main lip, wherein the main lip is embedded with an elastic member, wherein the elastic member comprises a plurality of elastic segments, wherein the plurality of elastic segments are distributed along the circumference of the main lip, and the elastic segments are bent radially inwardly along the main lip; the present invention utilizes a plurality of elastic segments bent radially inwardly along the main lip, so that the axial holding force of the main lip can change with the change of the internal pressure value, and under the premise of ensuring the sealing effect, the friction temperature rise rate at the main lip can be effectively alleviated, thereby improving the service life of the pressure-resistant oil seal.

Description

Technical Field

[0001] The invention relates to the technical field of sealing equipment, and in particular to an adjustable pressure-resistant oil seal. Background Art

[0002] Oil seals are mechanical components used to seal oil. They isolate the parts that need lubrication from the output parts in the transmission components to prevent lubricating oil leakage. When sealing machines with internal pressure such as high-pressure oil pumps and air pumps, pressure-resistant oil seals are required.

[0003] like Figure 1 As shown, the existing pressure-resistant oil seal mainly utilizes the main lip 11 to achieve sealing, and utilizes the thick and short connection between the sealing body 1 and the main lip 11 and the upturned structure of the skeleton 3 near the main lip 11 to achieve the pressure resistance of the main lip 11, and the shaft holding force of the main lip 11 mainly comes from the external annular spring 4; during the use of machines with internal pressure such as high-pressure oil pumps and air pumps, the internal pressure value changes dynamically. In order to ensure the sealing performance of the pressure-resistant oil seal, the shaft holding force of the main lip 11 should be large enough to ensure that the main lip 11 can achieve the sealing effect when the internal pressure value is at the highest; since the locking force applied by the annular spring 4 to the main lip 11 is constant, this requires the annular spring 4 to always apply a large locking force to the main lip 11; when the internal pressure value is not at the maximum value, the excessive shaft holding force causes the friction temperature at the main lip 11 to rise to a high level, which will seriously affect the service life of the pressure-resistant oil seal. At the same time, the shaft-holding force exerted by the annular spring 4 on the main lip 11 is only concentrated in a smaller area on the main lip 11 surrounded by the annular spring 4, which will result in a smaller effective sealing area on the main lip 11, poor shaft-following performance, and will also affect the sealing effect.

[0004] Therefore, designing a pressure-resistant oil seal whose main lip's holding force can change with the internal pressure, can alleviate the friction heating rate at the main lip and can improve the sealing effect is an urgent problem to be solved by sealing equipment manufacturers at this stage. Summary of the invention

[0005] In response to the problems existing in the prior art, the present invention provides an adjustable pressure-resistant oil seal, which utilizes a number of radially inwardly bent elastic sections along the main lip so that the axial holding force of the main lip can change with the change of the internal pressure value. While ensuring the sealing effect, the friction temperature rise rate at the main lip can be effectively alleviated, thereby increasing the service life of the pressure-resistant oil seal.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] The present invention provides an adjustable pressure-resistant oil seal, comprising a sealing body, wherein the sealing body is provided with a main lip, wherein an elastic member is embedded in the main lip, wherein the elastic member comprises a plurality of elastic segments, wherein the plurality of elastic segments are distributed along the circumference of the main lip, and wherein the elastic segments are bent inwardly along the radial direction of the main lip.

[0008] As a preferred technical solution, a skeleton is provided in the sealing body.

[0009] As a preferred technical solution, the longitudinal section of the skeleton is L-shaped.

[0010] As a preferred technical solution, the frame is made of metal material, the sealing body is made of rubber material, and the sealing body is fixed to the frame by heat treatment.

[0011] As a preferred technical solution, the main lip extends from the sealing body, the main lip extends in a direction approaching the axis of the sealing body, and the extension direction of the longitudinal section of the elastic member is consistent with the extension direction of the main lip.

[0012] As a preferred technical solution, an auxiliary lip is provided on the sealing body.

[0013] As a preferred technical solution, adjacent elastic segments are connected via connecting segments.

[0014] As a preferred technical solution, the connecting section is bent outwardly along the radial direction of the main lip.

[0015] As a preferred technical solution, the elastic member is made of an elastic alloy material, and the elastic member is embedded in the main lip by heat treatment.

[0016] As a preferred technical solution, the number of the elastic segments is set to 8-12 segments, and the elastic segments are evenly distributed along the circumference of the main lip.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The present invention utilizes a plurality of radially inwardly curved elastic sections along the main lip, so that the axial holding force of the main lip can change with the change of the internal pressure value. Under the premise of ensuring the sealing effect, the friction temperature rise rate at the main lip can be effectively alleviated, thereby increasing the service life of the pressure-resistant oil seal.

[0019] 2. The elastic part of the present invention extends in the same direction as the main lip, so that when the elastic section in the elastic part is deformed, it will exert an axial force on the main lip as a whole. The main lip can form a more integrated sealing area, which can further improve the sealing effect and make it unnecessary to adopt a thick and short design at the connection between the sealing body and the main lip, thereby reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of an existing pressure-resistant oil seal;

[0021] Figure 2It is a schematic diagram of the overall structure of an embodiment of an adjustable pressure-resistant oil seal of the present invention;

[0022] Figure 3 for Figure 2 A longitudinal cross-sectional view of the elastic member in FIG.

[0023] Figure 4 for Figure 2 A transverse cross-sectional view of the elastic member in FIG.

[0024] In the figure: 1-seal body, 11-main lip, 12-auxiliary lip, 2-elastic member, 21-elastic section, 22-connecting section, 3-skeleton, 4-annular spring. DETAILED DESCRIPTION

[0025] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0026] Please refer to Figure 2-Figure 4 The present invention provides an adjustable pressure-resistant oil seal, comprising a sealing body 1, which is the main structure of the pressure-resistant oil seal. When in use, the sealing body 1 is sleeved on the output shaft of a high-pressure oil pump, an air pump, etc.; the sealing body 1 is provided with a main lip 11, and the main lip 11 is provided with a sealing surface. When in use, the sealing surface on the main lip 11 is tightly fitted with the output shaft, and sealing is achieved through the main lip 11; an elastic member 2 is embedded in the main lip 11, and the elastic member 2 comprises a plurality of elastic segments 21, which are distributed along the circumference of the main lip 11, and the elastic segments 21 are bent inwardly along the radial direction of the main lip 11. When the internal pressure of the high-pressure oil pump, the air pump, etc. changes, the pressure borne by the main lip 11 changes accordingly, and the elastic segment 21 is deformed by force, so that the shaft holding force of the main lip 11 can change with the change of the internal pressure value, while ensuring the sealing effect, the friction heating rate at the main lip 11 can also be effectively alleviated.

[0027] In this embodiment, please refer to Figure 2 A skeleton 3 is provided in the sealing body 1, and the skeleton 3 can further improve the structural strength of the sealing body 1; further, the longitudinal section of the skeleton 3 is L-shaped, and the present invention no longer requires the end of the skeleton 3 close to the main lip 11 to provide pressure resistance for the main lip 11. Therefore, the end of the skeleton 3 close to the main lip 11 no longer needs to be warped upward, and the processing of the skeleton 3 is simpler and the cost is lower.

[0028] It should be noted that the frame 3 is preferably made of metal material, the sealing body 1 is preferably made of rubber material, and the sealing body 1 is fixed to the frame 3 by heat treatment, and the heat treatment method is usually vulcanization.

[0029] In this embodiment, please refer to Figure 2The main lip 11 extends from the sealing body 1, and the main lip 11 extends in a direction close to the axis of the sealing body 1, and the sealing surface of the main lip 11 can fit tightly on the output shaft; the extension direction of the longitudinal section of the elastic member 2 is consistent with the extension direction of the main lip 11, so that when the elastic segment 21 in the elastic member 2 is deformed, it will apply an axis-holding force to the entire main lip 11. When the deformation of the main lip 11 becomes larger, the elastic segment 21 applies an axis-holding force to more areas of the main lip 11 in the vertical direction, so that the main lip 11 can form a more integrated sealing area, which can further improve the sealing effect; and the connection between the sealing body 1 and the main lip 11 no longer needs to adopt a thick and short design, which reduces the use of raw materials for the main lip 11 and further reduces the production cost.

[0030] Based on the above examples, please refer to Figure 2 A secondary lip 12 is provided on the sealing body 1, and the extension direction of the secondary lip 12 is opposite to that of the main lip 11. When the present invention is in use, the secondary lip 12, the main lip 11 and the output shaft of the high-pressure oil pump, the air pump, etc. jointly form a chamber for accommodating grease, which can further reduce the friction temperature rise rate of the main lip 11 and improve the service life.

[0031] In this embodiment, please refer to Figure 4 Adjacent elastic segments 21 are connected by connecting segments 22. The connecting segments 22 connect the elastic segments 21 to form the elastic member 2 as a whole. The connecting segments 22 are integrally formed during manufacturing, which is convenient for manufacturing. Furthermore, the connecting segments 22 are bent outwardly along the radial direction of the main lip 11. The connecting segments 22 and the elastic segments 21 form a continuous curve. When the elastic segment 21 is deformed under force, the connecting segments 22 can also generate stress on the elastic segment 21 accordingly, thereby improving the stability of the force generated by the elastic segment 21 during deformation.

[0032] It should be noted that the elastic part 2 is preferably made of an elastic alloy material, and the elastic part 2 is embedded in the main lip 11 by heat treatment, and the heat treatment method is usually vulcanization; further, the shape of the elastic part 2 can preferably be a spring shape. Of course, the elastic part 2 can also be an integrally formed elastic sheet, so that the corresponding axial clamping force can be applied to the main lip 11 according to the deformation of the elastic part 2.

[0033] In this embodiment, please refer to Figure 4 The number of the elastic segments 21 is preferably set to 8-12 segments, and the elastic segments 21 are evenly distributed along the circumference of the main lip 11. The elastic segments 21 can evenly apply the shaft-holding force along the circumference of the main lip 11.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An adjustable pressure-resistant oil seal, characterized in that: The sealing body comprises a main lip, wherein an elastic member is embedded in the main lip, wherein the elastic member comprises a plurality of elastic segments, wherein the plurality of elastic segments are distributed along the circumference of the main lip, and the elastic segments are bent inwardly along the radial direction of the main lip; The main lip extends from the sealing body, and the main lip extends in a direction approaching the axis of the sealing body, and the extension direction of the longitudinal section of the elastic member is consistent with the extension direction of the main lip; The sealing body is provided with an auxiliary lip, and the extension direction of the auxiliary lip is opposite to that of the main lip; Adjacent elastic segments are connected via connecting segments; The connecting section is bent outwardly along the radial direction of the main lip; The elastic member is shaped like a spring.

2. The adjustable pressure-resistant oil seal according to claim 1, characterized in that: A frame is arranged inside the sealing body.

3. The adjustable pressure-resistant oil seal according to claim 2, characterized in that: The longitudinal section of the skeleton is L-shaped.

4. An adjustable pressure-resistant oil seal according to claim 2 or 3, characterized in that: The frame is made of metal material, the sealing body is made of rubber material, and the sealing body is fixed on the frame by heat treatment.

5. The adjustable pressure-resistant oil seal according to claim 1, characterized in that: The elastic member is made of an elastic alloy material and is embedded in the main lip by heat treatment.

6. The adjustable pressure-resistant oil seal according to claim 1, characterized in that: The number of the elastic segments is set to 8-12, and the elastic segments are evenly distributed along the circumference of the main lip.

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