Bidirectional seal

Abstract

The utility model discloses a kind of two-way sealing elements, and its technical solution main points are including: sealing ring;Sealing inner lip, it is double-layer setting and located the inner edge position of sealing ring;Sealing outer lip, it is double-layer setting and located the outer edge position of sealing ring;No. ring groove and no. 2 ring groove, both are respectively set in the two end faces of sealing ring, and its cross-sectional area is gradually reduced from notch to groove bottom;The groove depth of no. ring groove and no. 2 ring groove is greater than half of sealing ring thickness, and no. ring groove and no. 2 ring groove are arranged in staggered, and the two ring grooves of staggered are used in the both ends of sealing ring, when fluid extrudes any one side ring groove, because ring groove depth is greater than half of sealing ring, increase the extrusion surface of ring groove to fluid, increase the deformation variable of the extrusion of ring groove two sides to fluid, increase the radial deformation variable of sealing ring, so improve sealing effect.

Description

Technical Field

[0001] This utility model relates to a sealing element, and more specifically, to a bidirectional sealing element. Background Technology

[0002] The working principle of the sealing ring is as follows: Under no pressure, the sealing ring is in its normal state and can be easily inserted into the cylinder and surround the piston shaft. After being inserted into the cylinder to the appropriate size, when the injected fluid reaches a certain pressure, it compresses the sealing ring, causing it to expand and deform, forming a sealing contact with the cylinder and piston shaft, thus achieving a sealing connection.

[0003] Traditional bidirectional seals have weak radial deformation compensation of the sealing ring after the end face is squeezed by fluid. Therefore, a bidirectional seal that can improve deformation compensation under hydraulic pressure is needed to improve the sealing effect. Utility Model Content

[0004] The purpose of this invention is to provide a bidirectional sealing component, in which the sealing ring has two staggered annular grooves at both ends. When the fluid squeezes either side of the annular groove, because the depth of the annular groove is greater than half of the sealing ring, the contact length between the fluid and the groove wall is extended, the squeezing surface of the fluid on the annular groove is increased, and thus the deformation of the fluid squeezing both sides of the annular groove is increased, and the radial deformation of the sealing ring is increased, thereby improving the sealing effect.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: A bidirectional seal includes: a sealing ring; an inner sealing lip, which is double-layered and located at the inner edge of the sealing ring; an outer sealing lip, which is double-layered and located at the outer edge of the sealing ring; a first annular groove and a second annular groove, which are respectively formed on the two end faces of the sealing ring, and the cross-sectional area of ​​the first annular groove gradually decreases from the groove opening to the groove bottom; the groove depth of the first annular groove and the second annular groove is greater than half the thickness of the sealing ring, and the first annular groove and the second annular groove are staggered inside and outside.

[0006] Preferably, the inner sealing lip has an inner arc-shaped groove in the middle of its two layers, and the inner sealing lip and the inner arc-shaped groove form a wave-shaped structure.

[0007] Preferably, the outer sealing lip has an outer arc-shaped groove in the middle of its double layers, and the outer sealing lip and the outer arc-shaped groove form a wave-shaped structure.

[0008] Preferably, the cross-sections of the first and second annular grooves are like an isosceles trapezoid, and the bottom of the cross-section is an arc-shaped structure.

[0009] Preferably, the sealing ring has retaining rings attached to both ends, and a pressure ring slides inside the retaining ring. The pressure rings on both sides are inserted into the first ring groove and the second ring groove, respectively. When the fluid squeezes the pressure rings, the pressure rings further push the two sides of the ring grooves to squeeze radially outward and radially inward.

[0010] Preferably, the retaining ring includes an inner ring and an outer ring, and the pressure ring slides between the inner ring and the outer ring; the pressure ring is provided with a stop block, and both the inner ring and the outer ring are fixed with a stop block; when the stop block and the stop block collide, the pressure ring is restricted from sliding off from below the retaining ring; a rigid mesh is heat-fused and fixed above the inner ring and the outer ring to restrict the pressure ring from sliding off from above the retaining ring.

[0011] In summary, this utility model has at least one of the following beneficial effects: The design of the inner and outer sealing lips facilitates sealing both inside and outside. Both ends of the sealing ring are provided with annular grooves to facilitate bidirectional sealing. When one end is squeezed by oil, the annular groove on that end is squeezed to both sides by the oil, causing the sealing ring to deform radially and improve the sealing performance. In addition, the design uses a deeper annular groove to increase the radial deformation range, further improving the sealing performance. Furthermore, because both end faces use annular grooves, they can achieve a good sealing effect when subjected to oil pressure in both directions. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the bidirectional seal in the embodiment; Figure 2 This is a cross-sectional view of the bidirectional seal in the embodiment; Figure 3 This is a cross-sectional view of the retaining rings installed on both sides of the bidirectional seal in the embodiment; Figure 4 yes Figure 3 Enlarged view of part A in the image; Figure 5 This is a schematic diagram of the retaining ring in the embodiment.

[0013] In the picture: 1. Sealing ring; 21. Seal the inner lip; 22. Seal the outer lip; 31. Inner arc-shaped groove; 32. Outer arc-shaped groove; 41. Annular groove No. 1; 42. Annular groove No. 2; 5. Retaining ring; 51. Inner ring; 52. Outer ring; 53. Hard mesh 61. Abutment; 62. Block; 7. Pressure ring. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the accompanying drawings.

[0015] Example 1, a bidirectional seal, refer to Figure 1 and Figure 2 It includes a sealing ring 1, which is a rubber ring and is integrally molded.

[0016] The inner edge of the sealing ring 1 is provided with a circular sealing inner lip 21. The sealing inner lip 21 is a double-layered protrusion. The inner arc groove 31 is in the middle of the double layers of the sealing inner lip 21. The sealing inner lip 21 and the inner arc groove 31 form a wave-shaped structure. The wave design with protrusions and concavities facilitates deformation and improves the sealing performance of the inner edge.

[0017] The outer edge of the sealing ring 1 is provided with an annular sealing lip 22. The sealing lip 22 is a double-layered protrusion. The middle of the double layers of the sealing lip 22 is an outer arc-shaped groove 32. The sealing lip 22 and the outer arc-shaped groove 32 form a wave-shaped structure. The wave design with protrusions and concavities facilitates deformation and improves the sealing performance of the outer edge.

[0018] The sealing ring 1 has a first annular groove 41 and a second annular groove 42 on its two end faces to improve its bidirectional sealing performance.

[0019] Both the first annular groove 41 and the second annular groove 42 are circular annular grooves, and their rotation axes are the same as the rotation axis of the sealing ring 1.

[0020] The first annular groove 41 and the second annular groove 42 have the same shape. They are respectively opened on the two end faces of the sealing ring 1, and their cross-sectional areas gradually decrease from the groove opening to the groove bottom. The cross-sections of the first annular groove 41 and the second annular groove 42 are like isosceles trapezoids, and the bottom of the cross-section is an arc-shaped structure.

[0021] The groove depth of the first ring groove 41 and the second ring groove 42 is greater than half the thickness of the sealing ring 1. In this embodiment, the groove depth of the first ring groove 41 and the second ring groove 42 is the same, and the groove depth is 4 / 7 of the thickness of the sealing ring 1. If the first annular groove 41 and the second annular groove 42 are located at the same position of the sealing ring 1, the first annular groove 41 and the second annular groove 42 will be connected. To avoid this situation, the first annular groove 41 and the second annular groove 42 are arranged alternately inside and outside.

[0022] In this design, staggered deep annular grooves are designed on the two end faces of the sealing ring 1, which allows the oil to have a deeper compression space in the annular grooves. The deeper grooves also facilitate the deformation of the groove walls to both sides. When the oil directly squeezes the inner wall of the annular grooves, the radial deformation of the sealing ring 1 is increased.

[0023] Example 2, a bidirectional seal, differs from Example 1 in that, referring to... Figures 3-5 The sealing ring 1 has retaining rings 5 ​​attached to both ends, and the retaining rings 5 ​​are made of hard plastic; A pressure ring 7 slides inside the retaining ring 5, with the pressure rings 7 on both sides inserted into the first ring groove 41 and the second ring groove 42 respectively; the shape of the pressure ring 7 is adapted to the first ring groove 41 and the second ring groove 42.

[0024] Therefore, when the pressure ring 7 is pressed into the ring groove, it will squeeze the groove walls on both sides, resulting in a more stable radial deformation of the sealing ring 1.

[0025] The structure of retaining ring 5 is as follows: The retaining ring 5 includes an inner ring 51 and an outer ring 52, and the pressure ring 7 slides between the inner ring 51 and the outer ring 52; The pressure ring 7 is provided with a stop block 61, and both the inner ring 51 and the outer ring 52 are fixed with a stop block 62; When the stop block 61 and the stop block 62 are in contact, the pressure ring 7 is prevented from slipping off from below the retaining ring 5; When making the retaining ring 5, the inner ring 51 and the outer ring 52 are positioned in a special fixture, and then the pressure ring 7 is inserted between the inner ring 51 and the outer ring 52. After that, the inner ring 51 and the outer ring 52 are sealed with a hard mesh 53 by heat fusion to complete the making of the retaining ring 5. In other embodiments, the inner ring 51, the outer ring 52 and the hard mesh 53 can also be fixed by adhesive.

[0026] The rigid mesh 53 serves two purposes: first, it prevents the pressure ring 7 from slipping off the top of the retaining ring 5, making the installation of the retaining ring 5 easier; second, it facilitates the flow of oil through the mesh into the space between the inner ring 51 and the outer ring 52 to compress the pressure ring 7. The aperture of the rigid mesh 53 is large enough to allow for normal oil flow.

[0027] The working principle is: Two retaining rings 5 ​​are attached to the front and back sides of the sealing ring 1, and the pressure ring 7 needs to be inserted into the corresponding ring groove for positioning. Since there is a gap between the pressure ring 7 and the hard mesh 53, the gap provides sliding space for the pressure ring 7, ensuring that the pressure ring 7 can stably push the ring groove to deform when the oil is squeezed. Therefore, when not subjected to oil pressure, there is a gap between the stop block 61 and the stop block 62, and the pressure ring 7 and the corresponding ring groove will be in contact. At this time, the pressure ring 7 will not generate pre-pressure for deformation of the ring groove. When the sealing ring 1 is squeezed by the oil, the oil will squeeze the retaining ring 5 and the inner pressure ring 7 of the retaining ring 5. The oil enters the interior of the retaining ring 5 through the gaps of the hard mesh 53, forming a uniform pressure on the pressure ring 7. As the pressure ring 7 is subjected to the oil pressure, the pressure ring 7 is stably squeezed into the corresponding annular groove. The annular groove is squeezed and deformed in the radial direction of the sealing ring 1. Its advantage is that the overall squeezing of the pressure ring 7 makes the radial deformation of the sealing ring 1 more uniform and the sealing effect more stable.

[0028] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A bidirectional seal, characterized in that, include: Sealing ring (1); The inner sealing lip (21) is double-layered and located at the inner edge of the sealing ring (1); The sealing lip (22) is double-layered and located at the outer edge of the sealing ring (1); The first annular groove (41) and the second annular groove (42) are respectively opened on the two end faces of the sealing ring (1), and their cross-sectional areas gradually decrease from the groove opening to the groove bottom; The groove depth of the first annular groove (41) and the second annular groove (42) is greater than half the thickness of the sealing ring (1), and the first annular groove (41) and the second annular groove (42) are arranged alternately inside and outside.

2. The bidirectional seal according to claim 1, characterized in that: The inner sealing lip (21) has an inner arc-shaped groove (31) in the middle of its double layers, and the inner sealing lip (21) and the inner arc-shaped groove (31) form a wave-shaped structure.

3. The bidirectional seal according to claim 1, characterized in that: The sealing lip (22) has an outer arc groove (32) in the middle of its double layers, and the sealing lip (22) and the outer arc groove (32) form a wave-shaped structure.

4. The bidirectional seal according to claim 1, characterized in that: The cross-sections of the first annular groove (41) and the second annular groove (42) are like isosceles trapezoids, and the bottom of the cross-section is a circular arc structure.

5. The bidirectional seal according to claim 1, characterized in that: The sealing ring (1) has retaining rings (5) attached to both ends, and a pressure ring (7) slides inside the retaining ring (5). The pressure rings (7) on both sides are inserted into the first ring groove (41) and the second ring groove (42) respectively. When the fluid squeezes the pressure ring (7), the pressure ring (7) further pushes the two sides of the ring groove to squeeze radially outward and radially inward.

6. The bidirectional seal according to claim 5, characterized in that: The retaining ring (5) includes an inner ring (51) and an outer ring (52), and the pressure ring (7) slides between the inner ring (51) and the outer ring (52); The pressure ring (7) is provided with a stop block (61), and both the inner ring (51) and the outer ring (52) are fixed with a stop block (62); When the abutment (61) and the stop (62) collide, the pressure ring (7) is restricted from sliding off from below the retaining ring (5); A rigid mesh (53) is hot-melted and fixed above the inner ring (51) and the outer ring (52) to prevent the pressure ring (7) from slipping off from above the retaining ring (5).

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