Integrated double U-shaped sealing element

Abstract

The utility model discloses an integrated double-U-shaped sealing piece which comprises a first sealing part, a second sealing part and a sealing part. The second sealing part is connected with the first sealing part, a self-tightening cavity is defined between the second sealing part and the first sealing part, and the second sealing part comprises a movable sealing surface; the keel piece is connected with the first sealing part and the second sealing part; and the first sealing part and / or the second sealing part are / is provided with an overflowing hole which is communicated with the self-tightening cavity. The first sealing part and the second sealing part are combined, connected and enclosed to form the self-tightening cavity, so that a high-pressure medium can enter the self-tightening cavity in the use process to ensure the rigidity of the whole sealing element, and meanwhile, the first sealing part and the second sealing part are arranged at a certain included angle, so that a certain pressure is ensured in the self-tightening cavity when the outside is pressed, and the sealing effect is improved. And the movable sealing surface and the static sealing surface can be tightly attached to a connecting part, and the efficient sealing effect is achieved.

Description

Technical Field

[0001] This application relates to the technical field of seals, and particularly to an integrated double U-shaped seal. Background Art

[0002] Traditional U-shaped seals are widely used in sealing applications with high-pressure and low-speed reciprocating sliding due to their simple structure and easy installation and maintenance. U-shaped seals, V-shaped seals, and Y-shaped seals all belong to the lip seal form. However, leakage to varying degrees will occur in any form of seal. Therefore, in the working conditions where multiple combined seals are used, fluid will accumulate between the two seals. The accumulation of this fluid will cause the seals to be subjected to backpressure, and the backpressure formed sometimes will be higher than the pressure of the oil pressure system itself, which easily leads to the extrusion or deformation of the seals from the installation groove, resulting in the failure of the seals.

[0003] In the prior art, it is very difficult to completely avoid the leakage of seals. In order to reduce the deformation and failure of seals, a support ring is combined for use in the application of U-shaped seals. For example, the Chinese utility model patent with the publication number CN208185464U discloses a "U-shaped combined sealing ring", which includes a retaining ring, a U-shaped ring, and a support ring located inside the lip of the U-shaped ring. The support ring provides a certain supporting and abutting force to the U-shaped ring to ensure the working stability of the U-shaped ring.

[0004] Compared with a single ring, the above combined sealing ring structure requires higher installation complexity and accuracy. Secondly, when the liquid medium enters between the support ring and the U-shaped ring, it will also generate a force on the support ring towards the side away from the U-shaped ring. The greater the system pressure, the greater the force on the support ring. Over time, the clearance between the support ring and the U-shaped ring will gradually increase and lose the function of the support ring, reducing the sealing effect. Utility Model Content

[0005] In order to improve the sealing effect of the seal, this application provides an integrated double U-shaped seal.

[0006] The integrated double U-shaped seal provided by this application adopts the following technical solutions:

[0007] An integrated double U-shaped seal, comprising:

[0008] A first sealing portion, which is in sealing connection with a rotating or reciprocating shaft;

[0009] A second sealing portion, which is connected to the first sealing portion and encloses a self-tightening cavity with the first sealing portion. The second sealing portion includes a dynamic sealing surface; and

[0010] A keel member, which connects the first sealing portion and the second sealing portion;

[0011] Wherein, an overflow hole communicating with the self-tightening cavity is provided in the first sealing portion and / or the second sealing portion.

[0012] By adopting the above technical solution, during the working process, the high-pressure medium acts on the first sealing portion and the second sealing portion simultaneously, causing deformation to achieve sealing. At the same time, the high-pressure medium enters the self-tightening cavity through the overflow hole, giving a certain additional pressure to the first sealing portion and the second sealing portion, especially increasing the adhesion force between the dynamic sealing surface and the external component. The higher the system pressure, the higher the pressure in the self-tightening cavity, and the stronger the sealing effect. At the same time, the self-tightening cavity increases the rigidity of the entire seal, is suitable for high-pressure environments, and improves the overall anti-extrusion and damage resistance of the seal. In addition, when the system pressure is unloaded, the pressure reduction speed in the self-tightening cavity lags behind the change of the external pressure medium, which can effectively prevent the negative pressure generated during the movement of the shaft workpiece from causing the seal to fail, and can also prevent air from entering the self-tightening cavity, improving the service life.

[0013] Preferably, the first sealing portion includes a first sealing section and a second sealing section forming a certain angle; the second sealing portion includes a third sealing section and a fourth sealing section forming a certain angle. The first sealing section is connected to the third sealing section, and the second sealing section is connected to the fourth sealing section; wherein, the angle between the first sealing section and the third sealing section is greater than 90°, and the angle between the third sealing section and the fourth sealing section is greater than 90°.

[0014] By adopting the above technical solution, during the process of the high-pressure medium acting on the first sealing portion and the second sealing portion, due to the setting of the angle greater than 90°, the first sealing section to the fourth sealing section can undergo outward expansion deformation to achieve the sealing effect.

[0015] Preferably, a first horizontal pressure-receiving surface is formed at the connection of the first sealing section and the third sealing section, and a second horizontal pressure-receiving surface is formed at the connection of the second sealing section and the fourth sealing section.

[0016] By adopting the above technical solution, the first horizontal pressure-receiving surface and the second horizontal pressure-receiving surface can be used as the areas where the high-pressure medium acts intensively, driving the outward expansion of the first sealing section to the fourth sealing section, effectively ensuring the sealing effect.

[0017] Preferably, the dynamic sealing surface includes a first lip and a second lip arranged at intervals, and an arc-shaped groove is provided between the first lip and the second lip.

[0018] By adopting the above technical solution, as the main sealing position, the dynamic sealing surface is provided with a first lip and a second lip to form a double-sealing structure to further improve the sealing effect. The setting of the arc-shaped groove can be used as a storage groove. After accumulating a certain amount of liquid medium, it can lubricate the first lip and the second lip, improve the service life, and reduce noise.

[0019] Preferably, the arc-shaped groove is provided with a discharge hole communicating with the self-tightening cavity.

[0020] By adopting the above technical solution, when any one of the first lip and the second lip fails, the high-pressure medium can partially enter the self-tightening cavity from the discharge hole, reducing the acting force on the lip and effectively ensuring the sealing performance.

[0021] Preferably, the first sealing portion includes a static sealing surface that is sealingly connected to the rotating or reciprocating shaft, and the area of the static sealing surface is larger than the area of the dynamic sealing surface.

[0022] By adopting the above technical solution, the area of the static sealing surface is set to be larger than the area of the dynamic sealing surface, so that the assembly pressing force of the static sealing surface is greater than that of the dynamic sealing surface, and the installation is more reliable. At the same time, when subjected to the acting force of the high-pressure medium, the tight sealing surface can better hold the shaft workpiece, improving the stability during operation.

[0023] Preferably, the keel member includes:

[0024] A first connecting section; and

[0025] A second connecting section, the second connecting section being connected to the first connecting section;

[0026] Wherein, the first connecting section and the second connecting section have a certain included angle.

[0027] By adopting the above technical solution, the keel member can further provide the stiffness of the first sealing portion and the second sealing portion, and is better suitable for high-pressure application conditions. Secondly, the keel member with a certain included angle can also serve as an elastic compensation component for the first sealing portion and the second sealing portion, and can improve the recovery ability after pressure relief, further improving the service life.

[0028] Preferably, the first connecting section and / or the second connecting section is provided with a through hole.

[0029] By adopting the above technical solution, when the first sealing portion and the second sealing portion are manufactured and connected, the material can penetrate into the through hole, thereby improving the connection strength of the keel member in the first sealing portion and the second sealing portion.

[0030] Preferably, the first sealing portion and the second sealing portion are of an integral connection structure.

[0031] By adopting the above technical solution, the integral connection structure has better integrity, more uniform load bearing, and longer service life.

[0032] In summary, the present application includes at least one of the following beneficial technical effects:

[0033] 1. The first sealing part and the second sealing part are combined and connected to form a self-tightening cavity, so that the high-pressure medium can enter the self-tightening cavity during use to ensure the rigidity of the entire seal. At the same time, the first sealing part and the second sealing part are arranged at a certain angle. When the external pressure is applied, a certain pressure is ensured in the self-tightening cavity, so that the dynamic sealing surface and the static sealing surface can fit the connecting component tightly, achieving an efficient sealing effect;

[0034] 2. The double-lip seal structure design improves the sealing performance of the dynamic seal surface, and the arc groove combined with the unloading hole can ensure the lubrication of the dynamic seal surface. At the same time, when any lip fails, the pressure can be reduced to protect the remaining lips from working normally, thereby increasing the service life;

[0035] 3. By setting the keel with an angle, the rigidity of the seal is further guaranteed to be suitable for high-pressure working conditions, and a certain recovery ability can be guaranteed after pressure relief. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a cross-sectional view of an integrated double U-shaped seal;

[0037] Figure 2 This is a schematic diagram of the installation of an integrated double U-shaped seal;

[0038] Figure 3 It is a schematic diagram of the structure of an integrated double U-shaped seal;

[0039] Figure 4 It is a structural schematic diagram of the keel component.

[0040] Explanation of the reference numerals: 1. first sealing part; 11. first sealing section; 12. second sealing section; 13. first horizontal pressure surface; 14. static sealing surface; 2. second sealing part; 21. third sealing section; 22. fourth sealing section; 23. first lip; 24. second lip; 25. second horizontal pressure surface; 26. arc-shaped groove; 27. unloading hole; 28. dynamic sealing surface; 3. keel member; 31. first connecting section; 32. second connecting section; 33. through hole; 4. flow hole; 5. self-tightening chamber; 6. shaft; 7. valve body. DETAILED DESCRIPTION

[0041] The present application is further described in detail below in conjunction with the accompanying drawings.

[0042] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0044] Figure 1 With Figure 2 A one-piece double U-shaped seal structure is shown, including a first seal portion 1 and a second seal portion 2. Both the first seal portion 1 and the second seal portion 2 are in a V-like shape, and are vulcanized in two steps so that the first seal portion 1 and the second seal portion 2 form an integral connection mechanism.

[0045] The first seal portion 1 includes a connected first seal segment 11 and a second seal segment 12. A static seal surface 14 is formed at the connection of the first seal segment 11 and the second seal segment 12, and this static seal surface 14 is in sealed connection with the shaft 6. The second seal portion 2 includes a connected third seal segment 21 and a fourth seal segment 22. A dynamic seal surface 28 is formed at the connection of the third seal segment 21 and the fourth seal segment 22, and this dynamic seal surface 28 is in sealed connection with the inner surface of an external component such as a valve body 7. The area of the static seal surface 14 is larger than the area of the dynamic seal surface 28, so that the pressing force between the static seal surface 14 and the shaft 6 is relatively large after the seal is installed.

[0046] The first seal segment 11 is connected to the third seal segment 21, and the second seal segment 12 is connected to the fourth seal segment 22. At the same time, the angle between the first seal segment 11 and the third seal segment 21 is greater than 90°, and the angle between the second seal segment 12 and the fourth seal segment 22 is greater than 90°. And a first horizontal pressure-receiving surface 13 is formed at the connection of the first seal segment 11 and the third seal segment 21, and a second horizontal pressure-receiving surface 25 is formed at the connection of the second seal segment 12 and the fourth seal segment 22.

[0047] A self-tightening cavity 5 is formed by enclosing between the first sealing portion 1 and the second sealing portion 2. The cross-sectional shape of the self-tightening cavity 5 is such that two U-shaped openings are symmetrically arranged. An overflow hole 4 communicating with the self-tightening cavity 5 is provided on the first sealing portion 1 and / or the second sealing portion 2. In this embodiment, the overflow holes 4 are circumferentially and evenly distributed on the first sealing section 11, and the opening positions of the overflow holes 4 are located in the high-pressure chamber.

[0048] The dynamic sealing surface 28 includes a first lip portion 23 provided on the second sealing section 12 and a second lip portion 24 provided on the fourth sealing section 22. There is a certain distance between the first lip portion 23 and the second lip portion 24, and an arc-shaped groove 26 is provided therebetween. The arc-shaped groove 26 is recessed toward the side of the self-tightening cavity 5. At the same time, a drain hole 27 communicating with the self-tightening cavity 5 is provided in the arc-shaped groove 26.

[0049] Combined Figure 3 With Figure 4 The sealing member further includes a keel member 3. The cross-section of the keel member 3 is V-shaped and includes a first connecting section 31 and a second connecting section 32. In this embodiment, two keel members 3 are provided and are respectively used to connect the first sealing portion 1 and the second sealing portion 2. More precisely, the first connecting section 31 of one keel member 3 is located within the first sealing section 11, and the second connecting section 32 is located within the third sealing section 21. The first connecting section 31 of the other keel member 3 is located within the second sealing section 12, and the second connecting section 32 is located within the fourth sealing section 22. The keel member 3 is connected during the secondary vulcanization process of the first sealing portion 1 and the second sealing portion 2.

[0050] In addition, through holes 33 are provided on the first connecting section 31 and / or the second connecting section 32 of the keel member 3. The provision of the through holes 33 enables the material to penetrate into the through holes 33 during vulcanization connection, thereby achieving the effect of improving the connection strength.

[0051] During the use of this sealing member, when the fluid medium in the high-pressure chamber acts, part of the medium can enter the self-tightening cavity 5 to apply pressure to the dynamic sealing surface 28 and the static sealing surface 14. The greater the system pressure, the greater the additional pressure chamber in the self-tightening cavity 5. At the same time, due to the setting of the angle, when the sealing member deforms, the static sealing surface 14 and the dynamic sealing surface 28 can better generate elastic deformation to improve the sealing performance.

[0052] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. An integrated double U-shaped seal, characterized in that: include: A first sealing portion (1) is sealingly connected to a rotating or reciprocating shaft (6); a second sealing portion (2) connected to the first sealing portion (1) and enclosing a self-tightening cavity (5) with the first sealing portion (1), wherein the second sealing portion (2) comprises a dynamic sealing surface (28); and A keel member (3), wherein the keel member (3) connects the first sealing portion (1) and the second sealing portion (2); Wherein, the first sealing portion (1) and / or the second sealing portion (2) is provided with a flow hole (4) communicating with the self-tightening cavity (5).

2. The integrated double U-shaped seal according to claim 1, characterized in that: The first sealing portion (1) comprises a first sealing segment (11) and a second sealing segment (12) which form a certain angle; the second sealing portion (2) comprises a third sealing segment (21) and a fourth sealing segment (22) which form a certain angle, the first sealing segment (11) is connected to the third sealing segment (21), and the second sealing segment (12) is connected to the fourth sealing segment (22); wherein the first sealing segment (11) and the third sealing segment (21) form an angle greater than 90°, and the third sealing segment (21) and the fourth sealing segment (22) form an angle greater than 90°.

3. The integrated double U-shaped seal according to claim 2, characterized in that: The connection between the first sealing section (11) and the third sealing section (21) forms a first horizontal pressure surface (13), and the connection between the second sealing section (12) and the fourth sealing section (22) forms a second horizontal pressure surface (25).

4. The integrated double U-shaped seal according to claim 1, characterized in that: The dynamic sealing surface (28) comprises a first lip portion (23) and a second lip portion (24) which are arranged at an interval, and an arc-shaped groove (26) is provided between the first lip portion (23) and the second lip portion (24).

5. The integrated double U-shaped seal according to claim 4, characterized in that: The arc-shaped groove (26) is provided with a discharge hole (27) communicating with the self-tightening chamber (5).

6. The integrated double U-shaped seal according to claim 4, characterized in that: The first sealing portion (1) comprises a static sealing surface (14) which is sealingly connected to a rotating or reciprocating shaft (6), wherein the area of ​​the static sealing surface (14) is greater than the area of ​​the dynamic sealing surface (28).

7. The integrated double U-shaped seal according to claim 2, characterized in that: The keel member (3) comprises: A first connecting section (31); and A second connecting section (32), the second connecting section (32) being connected to the first connecting section (31); Wherein, the first connecting section (31) and the second connecting section (32) have a certain angle.

8. The integrated double U-shaped seal according to claim 7, characterized in that: The first connecting section (31) and / or the second connecting section (32) is provided with a through hole (33).

9. The integrated double U-shaped seal according to claim 1, characterized in that: The first sealing portion (1) and the second sealing portion (2) are an integrally connected structure.

Images