Y-shaped special-shaped rubber sealing element

Abstract

The utility model discloses a Y-shaped special-shaped rubber sealing element which comprises a sealing ring body of an annular structure, an inner lip and an outer lip which extend outwards are arranged on the inner edge and the outer edge of the upper side of the sealing ring body respectively, an arc-shaped groove is formed between the inner lip and the outer lip, first corner cutting faces are arranged on the sides, away from each other, of the inner lip and the outer lip, and second corner cutting faces are arranged on the first corner cutting faces. The arc-shaped groove is formed between the inner lip and the outer lip, and the arc-shaped groove is of a C-shaped structure, so that the inner lip and the outer lip can conveniently form an easily-deformed structure with two wide ends and a narrow middle part, the deformation capacity of the Y-shaped sealing ring under pressure is remarkably enhanced, and the pressure of the lip parts on a sealing surface is favorably improved; the corner cut faces with different sizes are arranged at the corners of the inner lip, the outer lip and the sealing ring body, especially when the Y-shaped sealing ring is further pressed to deform, a larger deformation space can be provided, the contact area of the Y-shaped sealing ring and the sealing face can be increased through the corner cut faces, the lips and the sealing face are matched more tightly, and the sealing performance is better.

Description

Technical Field

[0001] The utility model relates to the technical field of seals, in particular to a Y-shaped special-shaped rubber seal. Background Technique

[0002] The selection of the seal ring material is of great significance to its sealing performance and service life. The performance of the material directly affects the use performance of the seal ring. When selecting a seal ring, in addition to meeting the general requirements of the seal ring material, the seal ring should be elastic and resilient, and have appropriate mechanical strength, including expansion strength, elongation rate, tear strength, etc.;

[0003] The more commonly used seals are O-ring seals and Y-ring seals. The Y-ring seal has stronger sealing performance than the O-ring seal. The cross-section of the Y-ring seal is Y-shaped, which is a typical lip seal. Like the O-ring, it is widely used in reciprocating dynamic seal devices. The purpose of developing the Y-ring seal is to make up for the problems of the short life and poor sealing ability of the O-ring seal. The Y-shaped seal ring relies on its open lips to closely adhere to the surface of the shaft to be sealed to achieve sealing, which is the same principle as the O-ring relying on the inner ring to adhere to the shaft surface for sealing. However, due to its specially designed lip structure, the Y-ring has a closer contact force with the shaft surface than the O-ring, and the deformation or displacement caused by the shaft movement during operation is smaller. In the case of sealing, there is a normal pressure equal to the medium pressure at each point in contact with the sealing medium. Therefore, the bottom of the lip seal will be axially compressed, the lip will be circumferentially compressed, the contact width with the sealing surface will increase, and the contact stress will increase. When the internal pressure rises further, the distribution form and magnitude of the contact pressure will change further, and the lip will fit more closely with the sealing surface, so the sealing performance is better. This is the "self-sealing effect" of the Y-ring, which the O-ring seal does not have. Due to this self-sealing effect, a Y-ring can effectively seal a high pressure of 32 MPa;

[0004] Chinese Patent Publication No. CN104154232A discloses a Y-ring seal, on which a first secondary lip is provided on the static seal lip, which can make the static seal lip fit more closely with the inner wall of the valve cover, which is beneficial to preventing the Y-ring seal from loosening. Two second secondary lips are provided on the dynamic seal lip to ensure that the dynamic seal lip always keeps close contact with the outer wall of the valve stem during the movement of the valve stem, thereby achieving an excellent anti-leakage purpose;

[0005] The above-mentioned technology has the following disadvantages:

[0006] 1. The static seal lips increase the elasticity through a V-shaped opening between them, resulting in weak deformation ability of the Y-ring seal; 2. There is a lack of reasonable chamfer design on the static seal lips, between the static seal lips and their connection, which to a certain extent limits the further cooperation ability of the lips of the Y-ring seal with the sealing surface. Therefore, the utility model discloses a Y-shaped special-shaped rubber seal to solve the above technical problems. Summary of the Invention

[0007] The purpose of the present utility model is to provide a Y-shaped special-shaped rubber seal, which solves the problem of poor sealing ability of the existing Y-shaped sealing ring proposed in the above background technology.

[0008] The above technical purpose of the present utility model is achieved through the following technical solutions:

[0009] A Y-shaped special-shaped rubber seal includes a sealing ring body in a ring structure. At the inner and outer edges of the upper side of the sealing ring body, an inner lip and an outer lip extending outward are respectively provided. An arc-shaped groove is formed between the inner lip and the outer lip. First chamfered surfaces are provided on the sides of the inner lip and the outer lip away from each other. A second chamfered surface is provided at the inner edge of the lower side of the sealing ring body, and a third chamfered surface is provided at the outer edge of the lower side of the sealing ring body. And a transition part is provided between the first chamfered surface and the arc-shaped groove.

[0010] Preferably, the height of the outer lip is greater than the height of the inner lip.

[0011] Preferably, the transition part includes a flat surface connected to the first chamfered surface. An inclined surface is provided on the side of the flat surface away from the first chamfered surface, and the inclined surface is connected to the end of the arc-shaped groove.

[0012] Preferably, the central angle of the arc-shaped groove is an obtuse angle.

[0013] Preferably, the included angle between the first chamfered surface and the horizontal plane is 45°.

[0014] Preferably, the included angle between the second chamfered surface and the horizontal plane is 70°.

[0015] Preferably, the included angle between the third chamfered surface and the horizontal plane is 22.5°.

[0016] Advantageous Effects:

[0017] 1. For this Y-shaped special-shaped rubber seal, an arc-shaped groove is formed between the inner lip and the outer lip. Since the arc-shaped groove is in a "C" - shaped structure, it is beneficial for the inner lip and the outer lip to form an easily deformable structure with wide ends and a narrow middle. This significantly enhances the deformation ability of the Y-shaped sealing ring when it is compressed, and is beneficial for increasing the pressure of the lip on the sealing surface.

[0018] 2. For this Y-shaped special-shaped rubber seal, chamfered surfaces with different sizes are provided at the corners of the inner lip, the outer lip and the sealing ring body. Especially when the Y-shaped sealing ring is further compressed and deformed, it can provide a larger deformation space. The chamfered surfaces can increase the contact area between the Y-shaped sealing ring and the sealing surface, making the lip and the sealing surface fit more closely, so the sealing performance is better. Brief Description of the Drawings

[0019] Figure 1 This is a three-dimensional view of a Y-shaped special-shaped rubber seal of the present utility model;

[0020] Figure 2 This is a sectional view of a Y-shaped special-shaped rubber seal of the present utility model;

[0021] Figure 3 This is a cross-sectional view of a Y-shaped special-shaped rubber seal of the present utility model.

[0022] Reference numerals:

[0023] 1. Seal ring body; 2. Inner lip; 3. Outer lip; 4. Arc groove; 5. First chamfered surface; 6. Second chamfered surface; 7. Third chamfered surface; 8. Transition part; 801. Straight plane; 802. Oblique cutting plane. Detailed implementation manners

[0024] See Figures 1 to 3 As shown, a Y-shaped special-shaped rubber seal includes a seal ring body 1 with an annular structure. An inner lip 2 and an outer lip 3 extending outward are respectively arranged at the inner and outer edges on the upper side of the seal ring body 1, and the height of the outer lip 3 is greater than that of the inner lip 2;

[0025] Specifically, the inner lip 2 and the outer lip 3 extend outward from the seal ring body 1, and can form a basic "Y" - shaped structure, which ensures the deformation ability of the seal. And the higher outer lip 3 can provide a stronger contact pressure, which helps to improve the sealing performance in dynamic or static sealing applications.

[0026] Furthermore, an arc groove 4 is formed between the inner lip 2 and the outer lip 3, and the central angle of the arc groove 4 is an obtuse angle;

[0027] Specifically, since the arc groove has a "C" - shaped structure, it is beneficial for the inner lip and the outer lip to form an easily deformable structure with wide ends and narrow middle. The obtuse - angled arc groove 4 allows more deformation space for the inner lip and the outer lip when being pressed, thereby improving the adaptability and sealing effect of the seal. This significantly enhances the deformation ability of the Y - shaped seal ring when being pressed, and is beneficial to increasing the pressure of the lip on the sealing surface.

[0028] Furthermore, a transition part 8 is arranged between the first chamfered surface 5 and the arc groove 4. The transition part 8 includes a straight plane 801 connected to the first chamfered surface 5, and an oblique cutting plane 802 is arranged on the side of the straight plane 801 away from the first chamfered surface 5, and the oblique cutting plane 802 is connected to the end of the arc groove 4.

[0029] Specifically, the transition part 8 is located between the first chamfered surface 5 and the arc-shaped groove 4, playing a role of connection and transition. The flat straight surface 801 can provide a sealing contact surface, and the design of the inclined cutting surface 802 helps to achieve a smooth transition from the flat straight surface 801 to the arc-shaped groove 4, which can reduce the stress concentration caused by structural mutation;

[0030] Further, first chamfered surfaces 5 are provided at the sides of the inner lip 2 and the outer lip 3 away from each other. A second chamfered surface 6 is provided at the inner edge of the lower side of the sealing ring body 1, and a third chamfered surface 7 is provided at the outer edge of the lower side of the sealing ring body 1. The included angle between the first chamfered surface 5 and the horizontal plane is 45°, the included angle between the second chamfered surface 6 and the horizontal plane is 70°, and the included angle between the third chamfered surface 7 and the horizontal plane is 22.5°;

[0031] Specifically, when the Y-shaped sealing ring is further compressed and deformed, the first chamfered surface 5, the second chamfered surface 6, and the third chamfered surface 7 can provide a larger deformation space, can increase the contact area between the Y-shaped sealing ring and the sealing surface, making the lip fit more tightly with the sealing surface, so the sealing performance is better.

Claims

1. A Y-shaped special-shaped rubber seal, characterized in that, It includes a sealing ring body (1) in a ring structure. An inner lip (2) and an outer lip (3) extending outward are respectively arranged at the inner and outer edges on the upper side of the sealing ring body (1). An arc-shaped groove (4) is formed between the inner lip (2) and the outer lip (3). First chamfered surfaces (5) are arranged on the sides of the inner lip (2) and the outer lip (3) away from each other. A second chamfered surface (6) is arranged at the inner edge on the lower side of the sealing ring body (1). A third chamfered surface (7) is arranged at the outer edge on the lower side of the sealing ring body (1). And a transition part (8) is arranged between the first chamfered surface (5) and the arc-shaped groove (4).

2. The Y-shaped special-shaped rubber seal according to claim 1, wherein The height of the outer lip (3) is greater than the height of the inner lip (2).

3. The Y-shaped special-shaped rubber seal according to claim 1, characterized in that, The transition part (8) includes a flat surface (801) connected to the first chamfered surface (5). An inclined surface (802) is arranged on the side of the flat surface (801) away from the first chamfered surface (5). The inclined surface (802) is connected to the end of the arc-shaped groove (4).

4. A Y-shaped special-shaped rubber seal according to claim 1, characterized in that, The central angle of the arc-shaped groove (4) is an obtuse angle.

5. A Y-shaped special-shaped rubber seal according to claim 1, characterized in that, The included angle between the first chamfered surface (5) and the horizontal plane is 45°.

6. A Y-shaped special-shaped rubber seal according to claim 1, characterized in that, The included angle between the second chamfered surface (6) and the horizontal plane is 70°.

7. The Y-shaped special-shaped rubber seal according to claim 1, characterized in that, The included angle between the third chamfered surface (7) and the horizontal plane is 22.5°.

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