A coated high temperature resistant rubber seal
Patent Information
- Application Number
- CN202522592394.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-06
- Publication Date
- 2026-10-20
- Estimated Expiration
- 2035-12-06
AI Technical Summary
[0005]本实用新型的目的在于，提供一种包覆型耐高温橡胶密封件，能够解决现有部分耐高温密封件采用单一耐高温橡胶材料制成，但单一材料在耐高温性能、结构强度、密封稳定性等方面难以兼顾，虽能承受一定高温，但长期使用后易出现弹性衰减、拉伸断裂等问题，并且部分密封件缺乏有效的防腐蚀、耐磨防护结构，在高温且伴有腐蚀性介质的环境中，表面易被侵蚀，缩短使用寿命的问题
[0018]1、本申请通过设置功能包覆层，功能包覆层采用多层复合结构，实现耐高温、防腐、耐磨性能的协同提升，有效抵御高温环境与腐蚀性介质的侵蚀，延缓密封件老化速度，保障了密封件的密封性能；
Smart Images
Figure CN224871880U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rubber seal technology, and in particular to a coated high-temperature resistant rubber seal. Background Technology
[0002] Rubber seals are essential components in mechanical equipment, used to prevent fluid leakage and the intrusion of external contaminants. In fields such as automotive engines, exhaust systems, aerospace, and industrial high-temperature equipment, seals operate in harsh environments with alternating high and low temperatures and intense heat radiation for extended periods.
[0003] Some existing high-temperature resistant seals are made of a single high-temperature resistant rubber material. However, a single material cannot simultaneously guarantee high-temperature resistance, structural strength, and sealing stability. Although it can withstand certain high temperatures, it is prone to problems such as elastic decay and tensile fracture after long-term use. Furthermore, some seals lack effective anti-corrosion and wear-resistant protective structures. In high-temperature environments with corrosive media, the surface is easily corroded, shortening its service life.
[0004] To address this, a coated high-temperature resistant rubber seal is proposed. Utility Model Content
[0005] The purpose of this invention is to provide a covered high-temperature resistant rubber seal, which can solve the problem that some existing high-temperature resistant seals are made of a single high-temperature resistant rubber material. However, a single material is difficult to balance in terms of high-temperature resistance, structural strength, and sealing stability. Although it can withstand a certain high temperature, it is prone to problems such as elastic decay and tensile fracture after long-term use. In addition, some seals lack effective anti-corrosion and wear-resistant protective structures. In high-temperature environments with corrosive media, the surface is easily corroded, shortening the service life.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a coated high-temperature resistant rubber seal, comprising a sealing substrate, wherein a functional coating layer is provided on the outer surface of the sealing substrate, and an integral sealing lip is provided on the inner side of the sealing substrate, wherein a plurality of contact protrusions are provided on the inner side of the sealing lip, and the contact protrusions are integrally formed with the sealing lip.
[0007] The functional coating layer includes a high-temperature resistant isolation layer, an anti-corrosion isolation layer, and a wear-resistant surface layer, which are sequentially disposed on all the outer surfaces of the sealing substrate from the inside to the outside.
[0008] Preferably, the high-temperature resistant insulating layer is composed of a polytetrafluoroethylene coating with a thickness of 0.3-0.5 μm.
[0009] Preferably, the anti-corrosion isolation layer is made of polyimide material and has a thickness of 0.2-0.3 mm.
[0010] Preferably, the wear-resistant surface layer is a silicon carbide modified rubber coating with a thickness of 0.1-0.2 mm.
[0011] Preferably, a cavity is provided between the sealing substrate and the sealing lip, and a first reinforcing skeleton is embedded inside the cavity, the first reinforcing skeleton being located at the root of the sealing lip.
[0012] Preferably, a second reinforcing skeleton is embedded inside the sealing substrate, and the surface and inner side of the second reinforcing skeleton are provided with tooth-shaped protrusions integral with it, the tooth-shaped protrusions being embedded inside the sealing substrate.
[0013] Preferably, the second reinforcing skeleton is L-shaped, and the second reinforcing skeleton and the sealing substrate are integrally formed by injection molding.
[0014] Preferably, both the first and second reinforcing skeletons are metal springs or ring-shaped parts made of glass fiber reinforced plastic.
[0015] Preferably, the plurality of contact protrusions form a non-linear contact sealing path.
[0016] Preferably, the sealing substrate is composed of a fluororubber layer or a silicone rubber layer.
[0017] Compared with the prior art, the beneficial effects of this utility model are:
[0018] 1. This application sets up a functional coating layer, which adopts a multi-layer composite structure to achieve a synergistic improvement in high temperature resistance, corrosion resistance and wear resistance, effectively resisting the erosion of high temperature environment and corrosive media, delaying the aging rate of the seal, and ensuring the sealing performance of the seal.
[0019] 2. This application significantly improves the sealing fit and sealing reliability by using an integrated design of the sealing substrate and sealing lip, combined with a non-linear sealing path of the contact protrusion, forming multiple sealing defenses to prevent media leakage. Furthermore, the double-reinforced skeleton enhances the overall structural strength and deformation resistance of the sealing component, preventing elastic decay, tensile fracture, or plastic deformation under long-term high-temperature conditions, thus extending its service life. Attached Figure Description
[0020] Figure 1 This is an overall structural diagram of the encapsulated high-temperature resistant rubber seal of this utility model;
[0021] Figure 2 This is a cross-sectional schematic diagram of the sealing substrate of this utility model;
[0022] Figure 3 This is a schematic diagram showing the connection between the sealing substrate and the second reinforcing skeleton of this utility model;
[0023] Figure 4 This is a partial cross-sectional schematic diagram of the functional coating layer of this utility model.
[0024] In the figure, 1 is the sealing substrate; 2 is the functional coating layer; 21 is the high-temperature resistant isolation layer; 22 is the anti-corrosion isolation layer; 23 is the wear-resistant surface layer; 3 is the sealing lip; 4 is the contact protrusion; 5 is the cavity; 6 is the first reinforcing skeleton; 7 is the second reinforcing skeleton; and 8 is the toothed protrusion. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0026] Please see Figure 1-4 The present invention provides the following technical solution:
[0027] A type of encapsulated high-temperature resistant rubber seal includes a sealing substrate 1, a functional encapsulation layer 2 on the outer surface of the sealing substrate 1, a sealing lip 3 integrally formed therewith on the inner side of the sealing substrate 1, and a plurality of contact protrusions 4 on the inner side of the sealing lip 3, the contact protrusions 4 being integrally formed with the sealing lip 3.
[0028] The functional coating layer 2 includes a high-temperature resistant isolation layer 21, a corrosion-resistant isolation layer 22, and a wear-resistant surface layer 23, which are sequentially disposed on all the outer surfaces of the sealing substrate 1 from the inside to the outside.
[0029] In this embodiment: the sealing substrate 1 and the sealing lip 3 are integrally formed, ensuring the structural connection is firm and avoiding sealing failure caused by assembly gaps. At the same time, the contact protrusion 4 on the inner side of the sealing lip 3 is integrally formed with the lip, improving the structural stability of the contact protrusion 4, making it less prone to falling off or deforming. The setting of the contact protrusion 4 increases the contact pressure and contact area between the sealing lip 3 and the sealing surface. Combined with the design of the nonlinear sealing path, it can effectively fill the tiny gaps in the sealing surface, improve sealing reliability, and prevent fluid medium leakage. The functional coating layer 2 adopts a multi-layer composite structure to achieve a synergistic improvement in high temperature resistance, corrosion resistance, and wear resistance, effectively resisting the erosion of high temperature environment and corrosive media, slowing down the aging rate of the seal, and ensuring the sealing performance of the seal.
[0030] Specifically, such as Figure 4 As shown, the high-temperature resistant insulating layer 21 is composed of a polytetrafluoroethylene coating with a thickness of 0.3-0.5 mm.
[0031] Specifically, such as Figure 4 As shown, the anti-corrosion isolation layer 22 is made of polyimide material and has a thickness of 0.2-0.3 mm.
[0032] Specifically, such as Figure 4 As shown, the wear-resistant surface layer 23 is made of silicon carbide modified rubber coating with a thickness of 0.1-0.2 mm.
[0033] In this embodiment: a polytetrafluoroethylene (PTFE) coating is selected as the high-temperature resistant isolation layer 21. PTFE's excellent high-temperature resistance and chemical stability effectively resist heat radiation and heat conduction in high-temperature environments, preventing the sealing substrate 1 from softening, aging, or experiencing performance degradation due to high temperatures. A polyimide material is used as the anti-corrosion isolation layer 22. Polyimide has excellent corrosion resistance and high-temperature resistance, effectively isolating corrosive media such as acids, alkalis, oils, and gases from contact with the sealing substrate 1 and the high-temperature resistant isolation layer 21, preventing material aging, cracking, or failure caused by corrosive media erosion. This is particularly suitable for applications involving corrosive media in high-temperature conditions. A silicon carbide modified rubber coating is used as the wear-resistant surface layer 23. The silicon carbide modified rubber coating combines the flexibility of rubber with the high wear resistance of silicon carbide, significantly improving the wear resistance of the outer surface of the seal and reducing frictional wear between the seal and mating parts. This is especially suitable for scenarios where the sealing surface moves relative to each other, delaying seal failure caused by surface wear.
[0034] Specifically, such as Figure 2 As shown, a cavity 5 is provided between the sealing substrate 1 and the sealing lip 3, and a first reinforcing skeleton 6 is embedded inside the cavity 5. The first reinforcing skeleton 6 is located at the root of the sealing lip 3.
[0035] Specifically, such as Figure 3 As shown, a second reinforcing skeleton 7 is embedded inside the sealing substrate 1. The surface and inner side of the second reinforcing skeleton 7 are provided with tooth-shaped protrusions 8 that are integrated with it. The tooth-shaped protrusions 8 are embedded inside the sealing substrate 1.
[0036] Specifically, such as Figure 3 As shown, the second reinforcing skeleton 7 is L-shaped and is integrally formed with the sealing substrate 1 by injection molding.
[0037] Specifically, such as Figure 2 , Figure 3 As shown, both the first reinforcing skeleton 6 and the second reinforcing skeleton 7 are metal springs or ring-shaped parts made of glass fiber reinforced plastic.
[0038] In this embodiment: by providing a cavity 5 between the sealing substrate 1 and the sealing lip 3, a certain elastic deformation space is provided for the sealing lip 3, allowing it to better fit the sealing surface during installation and use, thus improving sealing flexibility and fit. Furthermore, by embedding the first reinforcing skeleton 6 at the root of the sealing lip 3, the structural strength and deformation resistance of the sealing lip 3 are specifically enhanced, preventing elastic decay or deformation due to long-term compression and high-temperature aging, ensuring the stability of the sealing shape of the sealing lip 3. Finally, by embedding the second reinforcing skeleton 7 inside the sealing substrate 1, the overall structural strength and tensile strength of the sealing substrate 1 are comprehensively improved. The second reinforcing skeleton 7 has strong tensile and tear resistance, preventing the sealing substrate 1 from breaking or deforming due to insufficient structural strength under high-temperature conditions. Furthermore, the toothed protrusions 8 on the surface and inner side of the second reinforcing skeleton 7 are embedded inside the sealing substrate 1, increasing the contact area and bonding force between the reinforcing skeleton and the sealing substrate 1. This effectively prevents relative displacement or separation between the reinforcing skeleton and the sealing substrate 1, ensuring the stability of the integrated structure. By using metal springs or glass fiber reinforced plastic as the first reinforcing skeleton 6 and the second reinforcing skeleton 7, good elastic support can be provided for the seal, while adapting to the deformation requirements of the seal. It can quickly rebound after being compressed, ensuring the flexibility and stability of the seal.
[0039] Specifically, such as Figure 2 As shown, a non-linear contact sealing path is formed between several contact protrusions 4.
[0040] Specifically, such as Figure 1 As shown, the sealing substrate 1 is made of fluororubber or silicone rubber.
[0041] In this embodiment: compared with the traditional linear sealing path, the non-linear contact sealing path extends the penetration path of the medium, effectively blocking the leakage of the fluid medium and significantly improving the sealing reliability. Furthermore, the non-linear path makes the contact protrusion 4 and the sealing surface present a multi-point and multi-segment distribution, which can better adapt to the slight unevenness of the sealing surface, fill the sealing gap, improve the sealing fit, and avoid sealing failure caused by insufficient sealing surface precision. Fluororubber or silicone rubber is used as the sealing matrix 1 material. Both are excellent high-temperature resistant rubber materials that can meet the usage requirements of high-temperature conditions, preventing the sealing matrix 1 from softening, deforming, or degrading at high temperatures, thus providing a basic guarantee for the high-temperature resistance performance of the seal.
[0042] Working principle: When the rubber seal is used, the sealing lip 3 adheres to the sealing surface under assembly pressure. The first reinforcing skeleton 6 at the root of the sealing lip 3 provides initial support, preventing excessive deformation of the lip due to excessive assembly force. As assembly progresses, the contact protrusions 4 on the inner side of the sealing lip 3 first contact the sealing surface. Because the contact protrusions 4 are non-linearly distributed, they form multi-point, multi-segment initial contact. Under continuous assembly pressure, the contact protrusions 4 undergo elastic deformation, tightly embedding themselves into the tiny gaps of the sealing surface, blocking the medium leakage channel. The rubber seal is used in complex processes such as high and low temperature alternation and vibration. In this case, the first reinforcing skeleton 6 and the second reinforcing skeleton 7 continuously provide structural support for the seal. The first reinforcing skeleton 6 ensures the morphological stability of the sealing lip 3 and avoids elastic decay caused by long-term compression and vibration. The second reinforcing skeleton 7 maintains the overall structural strength of the sealing substrate 1, prevents plastic deformation or fracture of the substrate, and extends the service life of the seal. The high-temperature resistant isolation layer 21, the anti-corrosion isolation layer 22, and the wear-resistant surface layer 23 respectively resist different damage factors such as high temperature, corrosion, and friction, ensuring that the protective performance of the rubber seal does not decrease during long-term use and ensuring the performance of the rubber seal.
[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A type of encapsulated high-temperature resistant rubber seal, comprising a sealing substrate (1), characterized in that: The outer surface of the sealing substrate (1) is provided with a functional coating layer (2), and the inner side of the sealing substrate (1) is provided with an integral sealing lip (3). The inner side of the sealing lip (3) is provided with a plurality of contact protrusions (4), and the contact protrusions (4) are integrally formed with the sealing lip (3). The functional coating layer (2) includes a high-temperature resistant isolation layer (21), an anti-corrosion isolation layer (22), and a wear-resistant surface layer (23), which are sequentially disposed on all outer surfaces of the sealing substrate (1) from the inside to the outside.
2. The coated high-temperature resistant rubber seal according to claim 1, characterized in that: The high-temperature resistant insulating layer (21) is composed of a polytetrafluoroethylene coating with a thickness of 0.3-0.5 mm.
3. The coated high-temperature resistant rubber seal according to claim 1, characterized in that: The anti-corrosion isolation layer (22) is made of polyimide material and has a thickness of 0.2-0.3 mm.
4. The coated high-temperature resistant rubber seal according to claim 1, characterized in that: The wear-resistant surface layer (23) is made of silicon carbide modified rubber coating with a thickness of 0.1-0.2 mm.
5. The coated high-temperature resistant rubber seal according to claim 1, characterized in that: A cavity (5) is provided between the sealing substrate (1) and the sealing lip (3), and a first reinforcing skeleton (6) is embedded inside the cavity (5). The first reinforcing skeleton (6) is located at the root of the sealing lip (3).
6. The coated high-temperature resistant rubber seal according to claim 5, characterized in that: The sealing substrate (1) has a second reinforcing skeleton (7) embedded inside. The surface and inner side of the second reinforcing skeleton (7) are provided with tooth-shaped protrusions (8) that are integral with it. The tooth-shaped protrusions (8) are embedded inside the sealing substrate (1).
7. The coated high-temperature resistant rubber seal according to claim 6, characterized in that: The second reinforcing skeleton (7) is L-shaped, and the second reinforcing skeleton (7) and the sealing substrate (1) are integrally formed by injection molding.
8. The coated high-temperature resistant rubber seal according to claim 6, characterized in that: The first reinforcing skeleton (6) and the second reinforcing skeleton (7) are both metal springs or ring-shaped parts made of glass fiber reinforced plastic.
9. The coated high-temperature resistant rubber seal according to claim 1, characterized in that: A non-linear contact sealing path is formed between several contact protrusions (4).
10. A coated high-temperature resistant rubber seal according to claim 1, characterized in that: The sealing substrate (1) is composed of a fluororubber layer or a silicone rubber layer.