Framework assembly type stretchable lip-shaped oil seal

Abstract

The utility model relates to a framework assembly type stretchable lip-shaped oil seal. A pure rubber skeleton-free structure is not provided with a reinforced skeleton, so that an oil seal is easy to deform under the long-time action of high temperature, medium and pressure, the assembly coaxiality is reduced, and the sealing performance is influenced. The rubber sealing ring comprises a rubber sealing ring body, an annular lip is arranged on the rubber sealing ring body, an annular cavity is formed in the top of the rubber sealing ring body, the longitudinal section of the rubber sealing ring body is concave through the cavity, and the lip is arranged on the inner wall of the inner side of the rubber sealing ring body. An annular retractable groove is formed in the bottom of the outer side part of the rubber sealing ring, and an annular assembly framework is arranged in the retractable groove. The assembling framework is installed after the rubber sealing ring passes through the flange plate or the expanded part, so that the lip-shaped oil seal can be assembled in a stretching mode and has enough strength after being installed, the assembling accuracy, strength and sealing reliability of the oil seal are improved, and sealing failure and medium leakage caused by deformation under the working conditions of high temperature, media and high pressure are avoided.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, specifically to a skeleton-assembled stretchable lip oil seal. Background Technology

[0002] Oil seals are mechanical components used to seal oil. They isolate lubricated parts from power-generating parts in transmission systems, preventing lubricant leakage. There are various types of oil seals, including ordinary oil seals, oil seals with dust lips, springless BV oil seals, single-lip exposed skeleton rubber oil seals with springs, double-lip exposed skeleton rubber oil seals with secondary lips, and external skeleton oil seals. These oil seals are suitable for different working conditions, such as high temperature, high speed, and heavy load.

[0003] In certain special applications, lip seals need to be stretched through flanges or expansion parts during installation to be properly installed. This makes it impossible for lip seals with skeletons to be used normally due to the presence of non-stretchable skeletons. A skeletonless structure made of pure rubber must be used. However, this structure is prone to deformation under high temperature, medium and pressure for a long time due to the lack of a reinforcing skeleton, which causes a decrease in assembly coaxiality and affects sealing performance.

[0004] Therefore, there is an urgent need for a lip seal that can be stretched for assembly and has sufficient strength after installation to prevent oil seal deformation. Summary of the Invention

[0005] The purpose of this invention is to provide a skeleton-assembled stretchable lip seal, so as to at least solve the problem that pure rubber lip seals are prone to deformation after installation.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A skeleton-assembled stretchable lip oil seal includes a rubber sealing ring, an annular lip on the rubber sealing ring, an annular cavity on the top of the rubber sealing ring, the cavity making the longitudinal section of the rubber sealing ring concave, and the lip being disposed on the inner wall of the inner part of the rubber sealing ring.

[0008] The bottom of the outer part of the rubber sealing ring is provided with an annular retractable groove, and an annular assembly skeleton is provided in the retractable groove.

[0009] Furthermore, the width of the outer portion of the rubber sealing ring is greater than the width of the inner portion.

[0010] Furthermore, the width of the retractable groove gradually decreases from the opening to the bottom.

[0011] Furthermore, the assembly frame is a segmented frame.

[0012] Furthermore, the longitudinal section of the assembly frame is trapezoidal, which matches the retractable groove.

[0013] Furthermore, the longitudinal section of the assembly frame is inverted T-shaped, including a horizontal part and a vertical part. The horizontal part is located at the bottom of the rubber sealing ring, and the vertical part is trapezoidal and located in the retractable groove.

[0014] Furthermore, an annular spring groove is provided on the inner wall of the cavity near the lip, and a spring is provided in the spring groove.

[0015] Furthermore, the spring is an easy-stretch screw-in connector spring.

[0016] Furthermore, the spring is a hook-type connector spring.

[0017] Furthermore, the inner diameter of the lip is smaller than the inner diameters of the top and bottom of the rubber sealing ring.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] This invention provides a skeleton-assembled stretchable lip seal. An assembly skeleton is set within a rubber sealing ring. After the rubber sealing ring is stretched through a flange or expansion section, the assembly skeleton is inserted into a retractable groove. When the assembly skeleton is inserted into the retractable groove, it compresses the groove. When the assembly skeleton is fully inserted, the retractable groove retracts due to its own elasticity until it completely encloses and secures the assembly skeleton. This allows the lip seal to be both stretchable and strong after installation, improving the seal's assembly accuracy, strength, and sealing reliability. It prevents deformation under high temperature, high medium, and high pressure conditions, which could lead to seal failure and medium leakage. This extends the service life of the lip seal, reduces maintenance costs and frequency, and ultimately improves equipment lifespan and reduces manufacturing costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a longitudinal cross-sectional view of Example 1;

[0022] Figure 2 This is a longitudinal cross-sectional view of the retractable groove and spring groove in Embodiment 1;

[0023] Figure 3 This is a longitudinal cross-sectional view of the spring in Example 1;

[0024] Figure 4 This is a top view of the assembled skeleton in Example 1;

[0025] Figure 5 This is a longitudinal sectional view of the assembled frame in Example 1;

[0026] Figure 6 This is a longitudinal cross-sectional view of Example 2;

[0027] Figure 7 This is a schematic diagram of the spring section in Example 3;

[0028] The diagram is labeled as follows:

[0029] 1-Rubber sealing ring, 2-Lip, 3-Cavity, 4-Retractable groove, 5-Assembly skeleton, 6-Spring groove, 7-Spring. Detailed Implementation

[0030] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0031] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Example 1:

[0034] like Figure 1As shown, this embodiment provides a skeleton-assembled stretchable lip seal, which is suitable for dynamic sealing applications where the lip seal needs to be stretched through the flange or expansion section during installation. It includes a rubber sealing ring 1, and the rubber sealing ring 1 is provided with an annular lip 2.

[0035] The rubber sealing ring 1 is made of a material with high elongation at break and good high temperature resistance and media resistance. In this embodiment, the rubber sealing ring 1 is made of fluororubber. In other embodiments, the rubber sealing ring 1 can also be made of nitrile rubber.

[0036] Specifically, the top of the rubber sealing ring 1 is provided with an annular cavity 3, the cavity 3 makes the longitudinal section of the rubber sealing ring 1 concave, and the lip 2 is integrally provided on the inner wall of the inner part of the rubber sealing ring 1.

[0037] The outer portion of the rubber sealing ring 1 is wider than the inner portion, which facilitates the setting of the retractable groove 4.

[0038] The inner diameter of the lip 2 is smaller than the inner diameters of the top and bottom of the rubber sealing ring 1, and the inner diameter of the top of the rubber sealing ring 1 is larger than the inner diameter of the bottom.

[0039] The bottom of the outer part of the rubber sealing ring 1 is provided with an annular retractable groove 4, and an annular assembly skeleton 5 is provided in the retractable groove 4.

[0040] The retractable groove 4 has a gradually decreasing width from the opening to the bottom, and its longitudinal section is trapezoidal, in order to improve the sealing effect of the assembly frame 5 and the retractable groove 4.

[0041] like Figure 4 As shown, the assembly frame 5 is segmented. In this embodiment, the assembly frame 5 is divided into 3 equal parts. In other embodiments, the assembly frame 5 can also be divided into 2 equal parts.

[0042] In this embodiment, as Figure 5 As shown, the longitudinal section of the assembly frame 5 is trapezoidal, which fits into the retractable groove 4. After the rubber sealing ring 1 is stretched through the flange or the expansion part, the assembly frame 5 is installed into the retractable groove 4. When the assembly frame 5 is installed into the retractable groove 4, it squeezes the retractable groove 4. When the assembly frame 5 is fully installed, the retractable groove 4 retracts by its own elasticity until the assembly frame 5 is wrapped and fixed.

[0043] The assembly frame 5 is made of high-strength metal or non-metal materials such as steel, aluminum alloy, and nylon.

[0044] like Figure 2 As shown, an annular spring groove 6 is provided on the upper part of the inner wall of the cavity 3 near the lip 2, and a spring 7 is provided in the spring groove 6.

[0045] To accommodate the overall stretching of the lip seal, in this embodiment, as follows: Figure 3 As shown, spring 7 is an easy-to-stretch screw-in joint spring with a low spring constant.

[0046] In this embodiment, after the rubber sealing ring 1 passes through the flange or the expansion part, the assembly skeleton 5 is installed in the rubber sealing ring 1. This allows the lip seal to be stretched and assembled, and it has sufficient strength after installation. This improves the assembly accuracy, strength and sealing reliability of the oil seal, and avoids deformation under high temperature, medium and high pressure conditions that could cause sealing failure and medium leakage. This extends the service life of the lip seal, reduces maintenance costs and frequency, and thus improves the service life of the equipment and reduces manufacturing costs.

[0047] The installation process in this embodiment is as follows:

[0048] Place the lip seal in a high-temperature aging chamber and preheat it to 160℃ for 3 minutes.

[0049] Put on heat-resistant gloves, remove the lip seal, and quickly stretch it through the flange with a maximum diameter of 310mm;

[0050] Insert the three-part assembly frame 5 into the retractable groove 4, press it tight, and install it in place;

[0051] Insert the spring 7 into the spring groove 6 of the lip seal;

[0052] Push the integral lip seal into the mounting base and install it evenly.

[0053] Example 2:

[0054] In this embodiment, as Figure 6 As shown, the longitudinal section of the assembly frame 5 is inverted T-shaped, including a horizontal part and a vertical part. The horizontal part and the vertical part are integrally set. The horizontal part is rectangular and is set at the bottom of the rubber sealing ring 1, and has the same width as the bottom of the rubber sealing ring 1. The vertical part is trapezoidal and is set in the retractable groove 4, fitting into the retractable groove 4. In this embodiment, the inverted T-shaped structure of the assembly frame 5 makes the oil seal assembly accuracy, strength and sealing reliability better.

[0055] The remaining structure and working principle are the same as in Example 1.

[0056] Example 3:

[0057] In this embodiment, as Figure 7 As shown, spring 7 is a hook-type connector spring. This structure makes it easier to connect. The head and tail hooks of spring 7 can be hooked together, which facilitates operation in blind spots.

[0058] The remaining structure and working principle are the same as in Example 1.

[0059] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A skeleton-assembled stretchable lip oil seal, comprising a rubber sealing ring (1), wherein the rubber sealing ring (1) is provided with an annular lip (2), characterized in that: The top of the rubber sealing ring (1) is provided with an annular cavity (3), the cavity (3) makes the longitudinal section of the rubber sealing ring (1) concave, and the lip (2) is provided on the inner wall of the inner part of the rubber sealing ring (1); The bottom of the outer part of the rubber sealing ring (1) is provided with an annular retractable groove (4), and an annular assembly skeleton (5) is provided in the retractable groove (4).

2. The skeleton-assembled stretchable lip oil seal according to claim 1, characterized in that: The width of the outer portion of the rubber sealing ring (1) is greater than the width of the inner portion.

3. The skeleton-assembled stretchable lip oil seal according to claim 1, characterized in that: The width of the retractable groove (4) gradually decreases from the opening to the bottom.

4. The skeleton-assembled stretchable lip oil seal according to claim 1, characterized in that: The assembly frame (5) is a segmented frame.

5. The skeleton-assembled stretchable lip oil seal according to claim 1, characterized in that: The longitudinal section of the assembly frame (5) is trapezoidal, which fits the retractable groove (4).

6. The skeleton-assembled stretchable lip oil seal according to claim 1, characterized in that: The longitudinal section of the assembly frame (5) is inverted T-shaped, including a horizontal part and a vertical part. The horizontal part is located at the bottom of the rubber sealing ring (1), and the vertical part is trapezoidal and located in the retractable groove (4).

7. The skeleton-assembled stretchable lip oil seal according to claim 1, characterized in that: An annular spring groove (6) is provided on the inner wall of the cavity (3) near the lip (2), and a spring (7) is provided in the spring groove (6).

8. A skeleton-assembled stretchable lip oil seal according to claim 7, characterized in that: The spring (7) is an easy-stretch screw-in joint spring.

9. A skeleton-assembled stretchable lip oil seal according to claim 7, characterized in that: The spring (7) is a hook-type connector spring.

10. A skeleton-assembled stretchable lip oil seal according to claim 1, characterized in that: The inner diameter of the lip (2) is smaller than the inner diameter of the top and bottom of the rubber sealing ring (1).

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