Low-friction combined dynamic sealing structure

Abstract

The utility model relates to a low-friction combined type dynamic sealing structure which comprises a rotor side framework, a stator side framework, a first sealing lip supporting assembly, a first sealing lip, a second sealing lip supporting support, a second sealing lip, a spring, a limiting gasket and a limiting support. The rotor side framework and the stator side framework are oppositely arranged, the first sealing lip supporting assembly and the second sealing lip supporting support are both connected with the rotor side framework, one end of the first sealing lip is fixed in the first sealing lip supporting assembly, the other end of the first sealing lip makes contact with the stator side framework, and the second sealing lip is fixedly connected with the second sealing lip supporting support. The spring is connected with the second sealing lip, the second sealing lip is embedded in the stator side framework, the limiting support is fixed on the outer side of the stator side framework, and the limiting gasket is fixed on the inner side of the stator side framework. The low-friction sealing device is suitable for low-friction sealing application working conditions with large shaft diameter, large shell hole diameter size and high linear speed, and muddy water and dust can be effectively prevented from entering a system cavity.

Description

Technical Field

[0001] The utility model belongs to the technical field of dynamic seals, and particularly relates to a low-friction combined dynamic seal structure. Background Art

[0002] With the booming development of the electric vehicle industry, the outer-rotor motor has an indispensable position in some special application scenarios. Due to the relatively high-speed rotational movement between its outer rotor and inner stator during operation, extremely high requirements are imposed on the design, manufacturing, and application of dynamic seals. The dynamic seal between its rotor and stator has always been a very difficult problem.

[0003] For an outer-rotor motor with a relatively large air-gap radius between the stator and the rotor, due to its large size and high linear speed brought by high speed, greater challenges are posed to the design and development of dynamic seals. Some motors operate in humid or even water-related environments, which requires the dynamic seal not only to prevent external dust, impurities, etc. from entering the motor, but also to prevent liquids such as water from entering the motor.

[0004] Currently, for the dynamic seal structure of outer-rotor motors in the market, the sealing effect is not good. Especially when the motor wades through water, it is easy for the dynamic seal to seep water, resulting in motor damage.

[0005] The durability performance of the dynamic seal is not good. After the motor operates for a period of time, due to changes in the external environment, such as temperature, altitude, atmospheric pressure, etc., some functions and performances of the dynamic seal fail, resulting in water seepage and impurity infiltration at the dynamic seal of the motor.

[0006] The linear speed of the outer-rotor motor is high. During the operation of the motor, in some working conditions, the linear speed can even reach more than 32 m / s. Some dynamic seal structures do not adopt good anti-friction technologies, and the sealing lip overheats and ages, which will also cause the seal to fail prematurely.

[0007] For some dynamic seal structures, although the sealing effect is good, the friction force is large, and installation, maintenance, and repair are difficult. For example, for some multi-rubber lip seal structures, the relative friction force between the stator and the rotor of the dynamic seal reaches several Newton-meters or even more than ten Newton-meters, which has an adverse impact on the system efficiency. Summary of the Invention

[0008] The utility model provides a low-friction combined dynamic seal structure to solve the technical problems mentioned in the background art.

[0009] The technical solution of the utility model is as follows: A low-friction combined dynamic seal structure includes: a rotor-side skeleton, a stator-side skeleton, a first seal lip support assembly, a first seal lip, a second seal lip support bracket, a second seal lip, a spring, a limit washer, and a limit bracket.

[0010] The rotor-side skeleton is disposed opposite to the stator-side skeleton. The first seal lip support assembly and the second seal lip support bracket are both connected to the rotor-side skeleton. One end of the first seal lip is fixed inside the first seal lip support assembly, and the other end contacts the stator-side skeleton. The second seal lip is fixedly connected to the second seal lip support bracket. The spring is connected to the second seal lip. The second seal lip is embedded in the stator-side skeleton. The limit bracket is fixed on the outer side of the stator-side skeleton, and the limit washer is fixed on the inner side of the stator-side skeleton.

[0011] Further, the first seal lip support assembly includes: an upper support frame and a lower support frame. Both the upper support frame and the lower support frame are fixed to the rotor-side skeleton, and the upper support frame and the lower support frame clamp and fix the first seal lip.

[0012] Further, the first seal lip is bonded to the upper support frame and the lower support frame by a sealant.

[0013] Further, the upper support frame, the lower support frame and the second seal lip support bracket are in interference fit on the inner side of the rotor-side skeleton, and a washer is provided between the lower support frame and the second seal lip support bracket.

[0014] Further, the rotor-side skeleton is bonded to a rotor-side rubber body, and a corrugated structure is provided on the rotor-side rubber body.

[0015] Further, the stator-side skeleton is bonded to a stator-side rubber body, and a corrugated structure is provided on the stator-side rubber body.

[0016] Further, a groove is provided on the contact surface of the first seal lip and the stator-side skeleton.

[0017] Further, the first seal lip is made of polytetrafluoroethylene material.

[0018] Further, the second seal lip is made of fluororubber material, and a lubricating coating is sprayed on the lip surface of the second seal lip.

[0019] Further, a drain hole is provided on the limit bracket.

[0020] The beneficial effects of the present utility model are as follows: The present utility model is applicable to low-friction seal application conditions with large shaft diameters, large housing hole diameters and high linear speeds, and can effectively prevent mud and dust from entering the system cavity.

[0021] Due to the excellent self-lubricity, high and low temperature performance, and outstanding dry friction performance of the PTFE material, the first sealing lip adopts a PTFE lip design, which has advantages such as a low friction coefficient and self-lubricating ability. The second sealing lip adopts a fluororubber lip with a tightening spring. In order to further reduce the friction force, a lubricating coating is sprayed on the surface of the fluororubber lip to ensure high-efficiency waterproof and dustproof while reducing the friction force.

[0022] The sealing component of the present utility model is axially limited at a suitable position through the limiting metal skeleton and the limiting washer, avoiding the risk of seal leakage caused by eccentricity and deformation during manufacturing, installation, and operating conditions. Brief Description of the Drawings

[0023] Figure 1 It is a structural schematic diagram of the present utility model. Detailed Embodiment

[0024] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0025] In the embodiment of the present utility model, Figure 1 It is a structural schematic diagram provided according to the specific structure of a low-friction combined dynamic seal structure of the present utility model. As Figure 1 shown, the present utility model includes:

[0026] The rotor-side skeleton 2, the stator-side skeleton 11, the first sealing lip support assembly, the first sealing lip 10, the second sealing lip support bracket 6, the second sealing lip 8 and the spring 9, the limiting washer 7 and the limiting bracket 13.

[0027] The rotor-side skeleton 2 and the stator-side skeleton 11 are arranged opposite to each other. The first sealing lip support assembly and the second sealing lip support bracket 6 are both connected to the rotor-side skeleton 2. One end of the first sealing lip 10 is fixed inside the first sealing lip support assembly, and the other end contacts the stator-side skeleton 11.

[0028] Specifically, the first sealing lip support assembly includes: an upper support frame 3 and a lower support frame 4. The upper support frame 3 and the lower support frame 4 are both fixed to the rotor-side skeleton 2, and the upper support frame 3 and the lower support frame 4 clamp and fix the first sealing lip 10.

[0029] The upper support bracket 3, the lower support bracket 4 and the second seal lip support bracket 6 are in interference fit inside the rotor side skeleton 2. The first seal lip 10 is bonded to the upper support bracket 3 and the lower support bracket 4 by sealant. The contact surfaces of the three have groove designs and sealant coatings to ensure the fixed position of the seal lip.

[0030] Among them, the first seal lip 10 is made of polytetrafluoroethylene material. The first seal lip 10 contacts the stator side skeleton 11. Grooves are provided on the contact surface between the first seal lip 10 and the stator side skeleton 11, which plays the first sealing effect, has good self-lubricity, high and low temperature performance, and excellent dry friction performance. During the process of cooperating with the stator side skeleton 11, it can adapt to the high linear speed of the outer bushing.

[0031] The rotor side skeleton 2 is bonded to the rotor side rubber body 1, and the rotor side rubber body 1 is provided with a corrugated structure. The rotor side skeleton 2 and the rotor side rubber body 1 form an outer bushing. The rotor side skeleton 2 and the rotor side rubber body 1 are thermally bonded through an adhesive during the thermoforming process. The outer bushing is in interference fit with the housing hole, and static sealing is adopted in two forms of metal skeleton and rubber. The rubber part has corrugations, and the metal skeleton part has an assembly guiding surface.

[0032] The second seal lip support bracket 6 is connected to the rotor side skeleton 2. Specifically, it can be consolidated by sealant and at the same time, an interference fit is achieved in cooperation with the first seal lip support assembly. A washer 5 is arranged between the lower support bracket 4 and the second seal lip support bracket 6. The washer is made of environmentally friendly asbestos material and is used to eliminate the gap generated during the flanging assembly of the skeleton.

[0033] The second seal lip 8 is fixedly connected to the second seal lip support bracket 6. Specifically, the second seal lip 8 is bonded and integrally formed with the second seal lip support bracket 6 through vulcanization. The second seal lip 8 is embedded in the stator side skeleton 11. The second seal lip 8 is made of fluororubber material, and a lubricating coating is sprayed on the lip surface of the second seal lip 8.

[0034] The spring 9 is connected to the second seal lip 8. The spring adopts a high-performance spring coil to enhance the IP anti-mud and water performance of the rubber.

[0035] The limit bracket 13 is fixed on the outer side of the stator side skeleton 11, and the limit washer 7 is fixed on the inner side of the stator side skeleton 11. In the illustrated direction, the outer side is the upper side and is directly connected to the outside, and the inner side is the lower side and is connected to the inside of the motor. Among them, a drain hole is provided on the limit bracket 13. The limit washer 7 is made of PTFE material and has self-lubricity, which plays a role of limit protection during the press-fitting process of the dynamic seal assembly. During the operation stage of the system, it avoids the interference friction phenomenon between the skeletons caused by possible eccentricity.

[0036] The stator-side skeleton 11 is bonded to the stator-side rubber body 12, and a corrugated structure is provided on the stator-side rubber body 12.

[0037] The stator-side skeleton 11 and the stator-side rubber body 12 form an inner lining sleeve. The stator-side skeleton 11 and the stator-side rubber body 12 are thermally bonded through an adhesive during the thermoforming process. The inner lining sleeve has an interference fit with the shaft surface, adopts static sealing in two forms of a metal skeleton and rubber, the rubber part has corrugations, and the metal skeleton part has an assembly guiding surface.

[0038] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A low-friction combined dynamic sealing structure, characterized in that: include: A rotor side frame (2), a stator side frame (11), a first sealing lip support assembly, a first sealing lip (10), a second sealing lip support bracket (6), a second sealing lip (8) and a spring (9), a limiting washer (7) and a limiting bracket (13); The rotor side frame (2) and the stator side frame (11) are arranged opposite to each other; the first sealing lip support assembly and the second sealing lip support bracket (6) are both connected to the rotor side frame (2); one end of the first sealing lip (10) is fixed inside the first sealing lip support assembly, and the other end is in contact with the stator side frame (11); the second sealing lip (8) is fixedly connected to the second sealing lip support bracket (6); the spring (9) is connected to the second sealing lip (8); the second sealing lip (8) is embedded in the stator side frame (11); the limiting bracket (13) is fixed to the outside of the stator side frame (11); and the limiting gasket (7) is fixed to the inside of the stator side frame (11).

2. The low-friction combined dynamic seal structure according to claim 1, characterized in that: The first sealing lip support assembly comprises: an upper support frame (3) and a lower support frame (4), wherein the upper support frame (3) and the lower support frame (4) are both fixed to the rotor side frame (2), and the upper support frame (3) and the lower support frame (4) clamp and fix the first sealing lip (10).

3. The low-friction combined dynamic seal structure according to claim 2, characterized in that: The first sealing lip (10) is bonded to the upper support frame (3) and the lower support frame (4) by means of a sealant.

4. The low-friction combined dynamic seal structure according to claim 2, characterized in that: The upper support frame (3), the lower support frame (4) and the second sealing lip support frame (6) are interference-fitted on the inner side of the rotor side frame (2), and a gasket (5) is provided between the lower support frame (4) and the second sealing lip support frame (6).

5. The low-friction combined dynamic seal structure according to claim 1, characterized in that: The rotor side frame (2) is bonded to the rotor side rubber body (1), and the rotor side rubber body (1) is provided with a corrugated structure.

6. The low-friction combined dynamic seal structure according to claim 1, characterized in that: The stator side frame (11) is bonded to the stator side rubber body (12), and the stator side rubber body (12) is provided with a corrugated structure.

7. The low-friction combined dynamic seal structure according to claim 1, characterized in that: A groove is provided on the contact surface between the first sealing lip (10) and the stator side frame (11).

8. The low-friction combined dynamic seal structure according to claim 1, characterized in that: The first sealing lip (10) is made of polytetrafluoroethylene material.

9. The low-friction combined dynamic seal structure according to claim 1, characterized in that: The second sealing lip (8) is made of fluororubber material, and a lubricating coating is sprayed on the lip surface of the second sealing lip (8).

10. The low-friction combined dynamic seal structure according to claim 1, characterized in that: The limiting bracket (13) is provided with a drainage hole.

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