Anti-falling type combined sealing washer

Abstract

The utility model belongs to the technical field of sealing washers, and particularly discloses an anti-falling type combined sealing washer which comprises a sealing inner ring and a metal outer ring, the metal outer ring is arranged outside the sealing inner ring in a sleeving mode, a circle of limiting table and two circles of sealing tables are arranged on the outer wall of the sealing inner ring, and the limiting table is located between the two circles of sealing tables. The metal outer ring is located between the two circles of sealing tables, a circle of limiting groove is formed in the inner wall of the metal outer ring, and the limiting groove is matched with the limiting tables in a limiting mode. According to the anti-falling type combined sealing gasket, through the limiting design of the inner wall of the metal outer ring and the outer wall of the sealing inner ring, the limiting effect on the sealing inner ring is achieved, the contact area of the metal outer ring and the sealing inner ring is increased, the sealing performance is improved, and the anti-falling type combined sealing gasket is not prone to falling off due to the physical limiting mode. The sealing inner ring is effectively prevented from falling off under the extreme conditions of high pressure, strong vibration and the like, and meanwhile the sealing inner ring can adapt to a wide temperature range.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealing gaskets, and in particular relates to an anti-falling type combined sealing gasket. Background Art

[0002] With the rapid development of aerospace technology, the performance requirements for various components of aircraft, especially sealing components, are increasing. In the pump or cylinder system of an aircraft, the pressure sensor is an indispensable component, which is responsible for monitoring and transmitting the pressure data in the pump or cylinder to ensure the stable operation of the aircraft. However, traditional pressure sensors have some limitations in sealing, especially in high pressure, high temperature, and strong vibration environments. Its sealing performance is easily affected and even causes leakage, thus threatening the safety of the aircraft.

[0003] The combined sealing gasket used in the existing pressure sensor (nominal pressure 400kgf / cm, working temperature -25~80℃) is mainly composed of an annular rubber inner ring and an annular metal outer ring. The metal outer ring is sleeved outside the rubber inner ring and the two are stuck together during vulcanization and pressing. When in use, the rubber inner ring is compressed and tightly attached to the pump body and the pressure sensor, effectively preventing the leakage of fluid or gas. Since the bonding surface between the rubber inner ring and the metal outer ring is relatively smooth and without any limit, the metal outer ring is easy to fall off from the rubber inner ring in the application environment of high pressure and strong vibration. At the same time, since the temperature range that the existing combined sealing gasket can adapt to is relatively narrow (only -25~80℃), therefore, in the environment with lower temperature requirements (-55℃~-25℃), the rubber inner ring will be brittle, and in the environment with higher temperature requirements (80℃~200℃), the rubber inner ring will be aged for a short time, resulting in the sealing performance of the entire combined sealing gasket being reduced or even failing.

[0004] Therefore, the inventor is committed to designing a combined sealing gasket to solve the above problems. Utility Model Content

[0005] The utility model aims to provide an anti-dropping combined sealing gasket, which can not only improve the overall sealing performance, but also effectively prevent the sealing inner ring from dropping off under extreme conditions such as high pressure, high temperature or strong vibration.

[0006] In order to achieve the above object, a technical solution adopted by the utility model is:

[0007] A combination sealing gasket with an anti-falling property comprises a sealing inner ring and a metal outer ring, wherein the metal outer ring is sleeved outside the sealing inner ring, a circle of limiting platforms and two circles of sealing platforms are arranged on the outer wall of the sealing inner ring, the limiting platform is located between the two circles of sealing platforms, the metal outer ring is located between the two circles of sealing platforms, a circle of limiting grooves is arranged on the inner wall of the metal outer ring, and the limiting grooves cooperate with the limiting platforms for limiting positions.

[0008] As an improvement of the anti-drop-off combined sealing gasket of the utility model, a circle of inner chamfers are respectively arranged at the two edges of the inner wall of the metal outer ring, and the two circles of inner chamfers are matched with the two circles of sealing platforms in a one-to-one correspondence.

[0009] As an improvement of the anti-drop-off combined sealing gasket of the utility model, the inner wall of the metal outer ring, the limiting groove and the inner chamfer are all sandblasted and bonded to the sealing inner ring.

[0010] As an improvement of the anti-falling combined sealing gasket of the utility model, the bonding strength between the sealing inner ring and the metal outer ring is greater than the tearing strength of the sealing inner ring.

[0011] As an improvement of the anti-falling combined sealing gasket of the utility model, the height of the sealing inner ring is greater than the height of the metal outer ring, and a circle of inclined surfaces are respectively provided at the two edges of the outer wall of the sealing inner ring, the two circles of sealing platforms are located between the two circles of inclined surfaces, and the two circles of inclined surfaces are exposed to the metal outer ring.

[0012] As an improvement of the anti-drop-off combined sealing gasket of the utility model, a circle of fillets is respectively arranged at the two edges of the inner wall of the sealing inner ring, and the fillets on the same side are connected to the corresponding sealing platform through the corresponding inclined surface.

[0013] As an improvement of the anti-drop-off combined sealing gasket of the utility model, the cross section of the sealing platform is triangular, the cross section of the limiting platform is V-shaped, and the height of the sealing platform is smaller than the height of the limiting platform.

[0014] As an improvement of the anti-falling combined sealing gasket of the utility model, the limiting groove is V-shaped, and the metal outer ring is made of 316 stainless steel.

[0015] As an improvement of the anti-drop-off type combined sealing gasket of the utility model, the sealing inner ring is made of fluoroether rubber, and a circle of annular bosses is arranged on the inner wall of the sealing inner ring.

[0016] As an improvement of the anti-falling combined sealing gasket of the utility model, the distance between the two circles of sealing platforms is smaller than the height of the sealing inner circle.

[0017] Compared with the prior art, the anti-falling combined sealing gasket of the utility model realizes the limiting effect on the sealing inner ring through the limiting design on the inner wall of the metal outer ring and the outer wall of the sealing inner ring, which not only increases the contact area between the metal outer ring and the sealing inner ring and improves the sealing performance, but also effectively prevents the sealing inner ring from falling off under extreme conditions such as high pressure and strong vibration through physical limiting. At the same time, it can adapt to a wider temperature range (-55~200℃). BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional enlarged view of the anti-falling type combined sealing gasket of the utility model;

[0019] Figure 2 It is an enlarged cross-sectional view of the anti-falling combined sealing gasket of the utility model;

[0020] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0021] Figure 4 It is a three-dimensional exploded enlarged view of the anti-dropping combined sealing gasket of the utility model;

[0022] Figure 5 It is a three-dimensional exploded enlarged view of the anti-dropping combined sealing gasket of the utility model from another perspective;

[0023] Figure 6 It is an enlarged cross-sectional view of the sealing inner ring of the utility model;

[0024] Figure 7 It is an enlarged cross-sectional view of the metal outer ring of the utility model;

[0025] Figure 8 It is a partial cross-sectional view of the combined sealing gasket, pressure sensor and pump body of the utility model.

[0026] Illustration Description:

[0027] 1. Sealing inner ring; 11. Limiting platform; 12. Sealing platform; 13. Boss; 14. Fillet; 15. Inclined surface; 2. Metal outer ring; 21. Limiting groove; 22. Inner chamfer; 23. Outer chamfer; 3. Pressure sensor; 4. Pump body. DETAILED DESCRIPTION

[0028] The following is a detailed explanation of the implementation of the present invention in conjunction with the accompanying drawings. The accompanying drawings are for reference and illustration only and do not constitute a limitation on the scope of patent protection of the present invention.

[0029] Reference Figures 1 to 7A combination sealing gasket with an anti-falling function comprises a sealing inner ring 1 and a metal outer ring 2. The metal outer ring 2 is sleeved outside the sealing inner ring 1. A circle of limiting platform 11 and two circles of sealing platforms 12 are arranged on the outer wall of the sealing inner ring 1. The limiting platform 11 and the metal outer ring 2 are both located between the two circles of sealing platforms 12. A circle of limiting groove 21 is arranged on the inner wall of the metal outer ring 2. The limiting groove 21 cooperates with the limiting platform 11 for limiting.

[0030] Reference Figures 2 to 6 Since fluoroether rubber not only has excellent chemical resistance, but also has good heat resistance, solvent resistance and plasma resistance, and at the same time, has low permeability to gases and liquids, good combustion resistance and electrical insulation performance, low friction and wear performance, thermal conductivity and linear expansion coefficient, it is particularly suitable for sealing applications in high-temperature working environments. Therefore, the sealing inner ring 1 of the present application is made of fluoroether rubber (the existing rubber inner ring is made of nitrile rubber) and is annular. The height of the entire sealing inner ring 1 is greater than the height of the entire metal outer ring 2. A circle of limit platforms 11 and two circles of sealing platforms 12 are spaced apart on the outer wall of the sealing inner ring 1. The cross-section of the limit platform 11 is V-shaped. The limit platform 11 is spaced apart between the two circles of sealing platforms 12. The cross-sections of the two sealing platforms 12 are both triangular and face toward The sealing inner ring 1 is open to the outside, the height of each sealing platform 12 is less than the height of the limiting platform 11, the distance between the two circles of sealing platforms 12 is less than the overall height of the sealing inner ring 1, and a circle of inclined surfaces 15 are respectively provided at the two edges of the outer wall of the sealing inner ring 1, and the two circles of sealing platforms 12 are located between the two circles of inclined surfaces 15. A circle of fillets 14 are respectively provided at the two edges of the inner wall of the sealing inner ring 1, and the fillet 14 at the upper end is connected to the sealing platform 12 at the upper end through the inclined surface 15 at the upper end, and the fillet 14 at the lower end is connected to the sealing platform 12 at the lower end through the inclined surface 15 at the lower section, so that the cross section of the sealing inner ring 1 is trapezoidal, and a circle of annular bosses 13 are provided on the inner wall of the sealing inner ring 1. In the utility model, the two circles of sealing platforms 12, a circle of limiting platforms 11 and a circle of bosses 13 are all integrally formed with the sealing inner ring 1.

[0031] Reference Figure 2 , Figure 3 , Figure 4 and Figure 7, since 316 stainless steel is a stainless steel with Ni, Cr, and Mo elements added to 304 stainless steel, it has higher density and better performance. This stainless steel material has good corrosion resistance, especially in acidic and alkaline environments. The addition of molybdenum makes it more corrosion-resistant. In addition, 316 stainless steel also has good high temperature resistance and is not easy to rust, while aircraft cannot use rusty materials (the existing metal outer ring is made of low-carbon steel and is easy to rust). Therefore, the metal outer ring 2 of the utility model is made of 316 stainless steel that is not easy to rust. The shape of the limit groove 21 matches the shape of the limit platform 11, and the limit groove 21 is also V-shaped. A circle of inner chamfers 22 are respectively provided at the two edges of the inner wall of the metal outer ring 2. The two circles of inner chamfers 22 correspond to the two circles of sealing platforms 12 one by one. The inner wall and the limit groove 21 of the metal outer ring 2 are respectively provided with a circle of inner chamfers 22. The two circles of inner chamfers 22 correspond to the two circles of sealing platforms 12 one by one. The groove 21 and the two circles of inner chamfers 22 are both treated by rough sandblasting and bonded to the sealing inner ring 1. Specifically, a circle of limiting grooves 21 is matched and bonded with a circle of limiting platforms 11, a circle of sealing platforms 12 at the upper end is matched and bonded with a circle of inner chamfers 22 at the upper end, and a circle of sealing platforms 12 at the lower end is matched and bonded with a circle of inner chamfers 22 at the lower end. A circle of outer chamfers 23 are respectively provided at the two edges of the outer wall of the metal outer ring 2. When the metal outer ring 2 and the sealing inner ring 1 are combined and bonded, two circles of inclined surfaces 15 are exposed to the metal outer ring 2, and the bonding strength between the sealing inner ring 1 and the metal outer ring 2 is greater than the tearing strength of the sealing inner ring 1 (the tearing strength of the sealing ring usually refers to the stress value that the sealing ring can withstand before breaking after reaching the maximum tensile force during the tensile test. The larger this value is, the better the elasticity of the sealing ring is, and it can withstand a larger tensile force without being easy to break).

[0032] Reference Figure 8 The method of using the anti-falling combined sealing gasket of the utility model is: put the entire combined sealing gasket on the external thread of the pressure sensor 3, and then install the pressure sensor 3 with the combined sealing gasket on the pump body 4. At this time, the pump body 4 is sealed and connected to the pressure sensor 3 through the sealing inner ring 1, and the metal outer ring 2 is located in the installation groove of the pump body 4.

[0033] Reference Figures 1 to 8In the anti-falling combined sealing gasket of the utility model, the sealing inner ring 1 is the main sealing part of the entire combined sealing gasket, and has good elasticity and sealing performance. When the thread is tightened, the V-shaped protrusion on the upper end of the sealing inner ring 1 is compressed and tightly attached to the inner wall of the mounting groove of the pump body 4, and the V-shaped protrusion on the lower end of the sealing inner ring 1 is compressed and tightly attached to the corresponding plane of the threaded end (rotating surface) of the pressure sensor 3, so as to achieve a sealing effect and effectively prevent leakage of fluid or gas. At the same time, the corrosion resistance and high temperature resistance of the fluoroether rubber material also enable it to maintain a stable working state in various complex working environments; the metal outer ring 2 is sleeved on the outside of the sealing inner ring 1, which not only increases the overall strength of the entire combined sealing gasket, but also realizes the sealing through the design of the limiting groove 21 on its inner wall. The limiting function of the sealing inner ring 1, this design not only increases the contact area between the metal outer ring 2 and the sealing inner ring 1, improves the sealing performance, but also effectively prevents the sealing inner ring 1 from falling off under extreme conditions such as high pressure and strong vibration through physical limiting. At the same time, it can adapt to a wider temperature range (-55~200℃), even in an environment with lower temperature requirements (-55C), the sealing inner ring 1 will not be brittle, and in an environment with higher temperature requirements (200°C), the sealing inner ring 1 will not be short-term aging. The inner wall of the metal outer ring 2 and the limiting groove 21 and the inner chamfer 22 on the inner wall are all treated with coarse sandblasting, which can make the adhesion between the sealing inner ring 1 and the metal outer ring 2 better, and the working temperature of the entire combined sealing gasket can reach -55~200℃.

[0034] In practical applications, the anti-drop-off combined sealing gasket is mainly sleeved on the external thread of the pressure sensor 3 to seal the pump or cylinder connected to the aircraft. Through its unique structure and excellent performance, the sealing gasket can ensure that the pressure sensor 3 maintains stable sealing performance in various complex working environments, thereby ensuring the safe and stable operation of the aircraft.

[0035] The above disclosure is only a preferred embodiment of the present invention, which cannot be used to limit the scope of protection of the present invention. Therefore, equivalent changes made within the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. An anti-drop-off combined sealing gasket, characterized in that: It includes a sealing inner ring and a metal outer ring, the metal outer ring is sleeved outside the sealing inner ring, a circle of limiting platforms and two circles of sealing platforms are arranged on the outer wall of the sealing inner ring, the limiting platforms and the metal outer ring are both located between the two circles of sealing platforms, a circle of limiting grooves is arranged on the inner wall of the metal outer ring, and the limiting grooves cooperate with the limiting platforms in limiting positions.

2. The anti-drop-off combined sealing gasket according to claim 1, characterized in that: A circle of inner chamfers is respectively arranged at the two edges of the inner wall of the metal outer ring, and the two circles of inner chamfers are matched with the two circles of sealing platforms in a one-to-one correspondence.

3. The anti-drop-off combined sealing gasket according to claim 2, characterized in that: The inner wall of the metal outer ring, the limiting groove and the inner chamfer are all sandblasted and bonded to the sealing inner ring.

4. The anti-drop-off combined sealing gasket according to claim 3, characterized in that: The bonding strength between the sealing inner ring and the metal outer ring is greater than the tearing strength of the sealing inner ring.

5. The anti-drop-off combined sealing gasket according to claim 2, characterized in that: The height of the sealing inner ring is greater than that of the metal outer ring. A circle of inclined surfaces is respectively arranged at two edges of the outer wall of the sealing inner ring. The two circles of sealing platforms are located between the two circles of inclined surfaces, and the two circles of inclined surfaces are exposed to the metal outer ring.

6. The anti-drop-off combined sealing gasket according to claim 5, characterized in that: A circle of fillets is respectively arranged at the two edges of the inner wall of the sealing inner ring, and the fillets on the same side are connected to the corresponding sealing platform through the corresponding inclined surface.

7. The anti-drop-off combined sealing gasket according to claim 1, characterized in that: The cross section of the sealing platform is triangular, the cross section of the limiting platform is V-shaped, and the height of the sealing platform is smaller than the height of the limiting platform.

8. The anti-drop-off combined sealing gasket according to claim 1, characterized in that: The limiting groove is V-shaped, and the metal outer ring is made of 316 stainless steel.

9. The anti-drop-off combined sealing gasket according to claim 1, characterized in that: The sealing inner ring is made of fluoroether rubber, and a circle of annular bosses is arranged on the inner wall of the sealing inner ring.

10. The anti-drop-off combined sealing gasket according to claim 1, characterized in that: The distance between the two circles of sealing platforms is smaller than the height of the sealing inner circle.

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