A multi-seal high-pressure liquid-resistant seal

Abstract

The present invention discloses a multi-seal, high-pressure liquid-resistant seal comprising a cylindrical body with a diameter of d. The outer wall of the cylindrical body is provided with at least two sealing protrusions arranged along its length, each of which is annularly arranged around the outer wall of the cylindrical body. The ends of the cylindrical body are provided with a first pressure-bearing end face and a second pressure-bearing end face, respectively. The multi-seal, high-pressure liquid-resistant seal provided by the present invention improves sealing performance through the multiple sealing protrusions.

Description

Technical Field

[0001] The present invention relates to the field of seals, and in particular to a multi-seal high-pressure liquid-resistant seal. Background Art

[0002] Hydraulic expansion clamps utilize the incompressibility of liquid plastic to uniformly transfer pressure to a thin-walled sleeve, positioning and clamping the workpiece through the sleeve's deformation. This deformation is achieved through changes in hydraulic pressure, which are regulated by a power piston. To prevent leakage of fluid from the hydraulic chamber toward the power piston, a seal is required at the end of the power piston. However, current hydraulic expansion clamps use a single-ring seal, which is ineffective and results in unstable clamping force. Summary of the Invention

[0003] The object of the present invention is to provide a multi-sealing high-pressure liquid-resistant seal, which improves the sealing performance through multiple sealing protrusions.

[0004] To achieve the above-mentioned objectives, the present invention provides a multi-seal high-pressure liquid-resistant seal, comprising a columnar body with a diameter of d, at least two sealing protrusions being sequentially provided on the outer wall of the columnar body along its length direction, and each sealing protrusion being arranged in a ring shape around the outer wall of the columnar body; a first pressure-bearing end face and a second pressure-bearing end face are respectively provided at both ends of the columnar body.

[0005] As a further improvement of the present invention, the sealing protrusion includes a first sealing protrusion and a second sealing protrusion, and the first sealing protrusion, the second sealing protrusion and the second pressure end face are arranged in sequence along the length direction of the columnar body; the outer diameter of the first sealing protrusion is D1, and the outer diameter of the second sealing protrusion is D2, and D2>D1.

[0006] As a further improvement of the present invention, the outer diameter D1 of the first sealing protrusion ranges from 1.03d to 1.08d, and the outer diameter D2 of the second sealing protrusion ranges from 1.10d to 1.20d.

[0007] As a further improvement of the present invention, the outer side wall with the largest diameter on the first sealing protrusion is a cylindrical surface, and its length is L, and the range of L is 0.05d-0.1d.

[0008] As a further improvement of the present invention, the cylindrical surface of the first sealing protrusion is connected to the first pressure-bearing end surface via a conical surface, and the angle between the conical surface and the first pressure-bearing end surface is α, and the range of α is 30-50°.

[0009] As a further improvement of the present invention, the side wall of the second sealing protrusion is in an arc shape, and its cross-sectional radius is R, and the range of R is 0.1d-0.2d.

[0010] As a further improvement of the present invention, the first pressure-bearing end surface is annular, and a pressure-bearing inner groove is provided on the inner side of the first pressure-bearing end surface.

[0011] Beneficial effects

[0012] Compared with the prior art, the advantages of the multi-seal high-pressure liquid resistant seal of the present invention are:

[0013] One of the seal's pressure-bearing ends is connected to the power piston, while the other end contacts the liquid in the hydraulic chamber of the hydraulic expansion clamp. By providing multiple sealing protrusions along the length of the cylindrical outer wall, even if high-pressure liquid does penetrate between the hydraulic expansion clamp and the first sealing protrusion on the seal, it is unlikely to penetrate the remaining sealing protrusions. This ensures a strong seal and helps ensure the operational stability of the hydraulic expansion clamp.

[0014] 2. The outer diameter of the second sealing protrusion is larger than the outer diameter of the first sealing protrusion, further enhancing the sealing effect.

[0015] 3. The outer diameter D1 of the first sealing protrusion is in the range of 1.03d-1.08d, and the outer diameter D2 of the second sealing protrusion is in the range of 1.10d-1.20d, so as to avoid the problem of easy damage caused by the sealing protrusion being too high relative to the side wall of the columnar body.

[0016] 4. The cylindrical surface of the outer wall of the first sealing protrusion has a length of 0.05d-0.1d, which contacts the inner wall of the hydraulic cavity of the hydraulic expansion clamp, providing sufficient sealing performance while avoiding excessive resistance.

[0017] 5. The side wall of the second sealing protrusion is in an arc shape, and its contact area with the inner wall of the hydraulic cavity of the liquid expansion clamp is not large, which not only provides sufficient sealing performance but also avoids excessive resistance.

[0018] 6. A pressure-bearing inner groove is provided on the inner side of the annular first pressure-bearing end surface, and the pressure-bearing inner groove is opposite to the inner side of the first sealing protrusion. When the power piston drives the seal to apply pressure to the high-pressure liquid, the liquid enters the pressure-bearing inner groove and exerts pressure on the sidewalls of the pressure-bearing inner groove, thereby strengthening the contact between the first sealing protrusion and the inner wall of the hydraulic chamber.

[0019] The present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, which are used to illustrate embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 4 is a cross-sectional view of the multi-seal high-pressure liquid-resistant seal in Example 1;

[0022] Figure 2 This is a front view of the multi-seal high-pressure liquid-resistant seal in Example 1;

[0023] Figure 3 This is a diagram showing the use status of the multi-seal high-pressure liquid-resistant seal in Example 1;

[0024] Figure 4 This is a front view of the multi-seal high-pressure liquid-resistant seal in Example 2. DETAILED DESCRIPTION

[0025] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0026] Example 1

[0027] The specific embodiments of the present invention are as follows Figures 1 to 4 As shown, a multi-seal, high-pressure liquid-resistant seal comprises a cylindrical body 1 having a diameter d. The outer wall of the cylindrical body 1 is provided with at least two sealing protrusions along its length, each of which is arranged in an annular shape around the outer wall of the cylindrical body 1. A first pressure-bearing end surface 7 and a second pressure-bearing end surface 8 are provided at each end of the cylindrical body 1, respectively.

[0028] The sealing protrusions include a first sealing protrusion 2 and a second sealing protrusion 3. The first sealing protrusion 2, the second sealing protrusion 3 and the second pressure-bearing end face 8 are arranged in sequence along the length of the columnar body 1. The outer diameter of the first sealing protrusion 2 is D1, and the outer diameter of the second sealing protrusion 3 is D2, where D2>D1.

[0029] The outer diameter D1 of the first sealing protrusion 2 is in the range of 1.03d-1.08d, and the outer diameter D2 of the second sealing protrusion 3 is in the range of 1.10d-1.20d.

[0030] The outer side wall of the first sealing protrusion 2 with the largest diameter is a cylindrical surface, and its length is L, and the range of L is 0.05d-0.1d.

[0031] The cylindrical surface of the first sealing protrusion 2 is connected to the first pressure end surface 7 via a conical surface 21 . The angle α between the conical surface 21 and the first pressure end surface 7 is 30-50°, and is 40° in this embodiment.

[0032] The side wall of the second sealing protrusion 3 is in an arc shape, and its cross-sectional radius is R, and the range of R is 0.1d-0.2d.

[0033] The first pressure-bearing end surface 7 is annular and has a pressure-bearing inner groove 71 defined within it. This inner groove 71 faces the first sealing protrusion 2 from behind. When the power piston 6 drives the seal to apply pressure to the high-pressure liquid, the liquid enters the inner groove 71 and exerts pressure on the sidewalls of the groove, forcing the first sealing protrusion 2 into closer contact with the inner wall of the hydraulic chamber.

[0034] During use, the seal is installed within the hydraulic chamber 5 of the hydraulic expansion clamp housing 4. The seal's second pressure-bearing end face 8 is connected to one end of the power piston 6, while the first pressure-bearing end face 7 contacts the liquid within the hydraulic chamber 5 of the hydraulic expansion clamp. By providing a first sealing protrusion 2 and a second sealing protrusion 3 along the length of the outer wall of the columnar body 1, even if high-pressure liquid were to penetrate between the hydraulic expansion clamp and the first sealing protrusion 1 on the seal, it would be difficult to penetrate the second sealing protrusion 3 behind it, resulting in an effective seal and ensuring the operational stability of the hydraulic expansion clamp.

[0035] Example 2

[0036] like Figure 4 As shown, the difference from embodiment 1 is that there are two second sealing protrusions 3. One first sealing protrusion 2 and two second sealing protrusions 3 are arranged in sequence along the length direction of the columnar body 1.

[0037] The present invention has been described above in conjunction with the best embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations based on the essence of the present invention.

Claims

1. A multi-seal high-pressure liquid-resistant seal, characterized in that: The invention comprises a columnar body (1) having a diameter of d, wherein at least two sealing protrusions are sequentially provided on the outer wall of the columnar body (1) along its length direction, and each sealing protrusion is arranged in a ring shape around the outer wall of the columnar body (1); a first pressure end face (7) and a second pressure end face (8) are respectively provided at both ends of the columnar body (1); the sealing protrusions comprise a first sealing protrusion (2) and a second sealing protrusion (3), and the first sealing protrusion (2), the second sealing protrusion (3) and the second pressure end face (8) are sequentially arranged along the length direction of the columnar body (1); the outer diameter of the first sealing protrusion (2) is D1, and the outer diameter of the second sealing protrusion (3) is D2. The outer diameter of the sealing protrusion (3) is D2, and D2>D1; the outer diameter D1 of the first sealing protrusion (2) ranges from 1.03d to 1.08d, and the outer diameter D2 of the second sealing protrusion (3) ranges from 1.10d to 1.20d; the first pressure-bearing end surface (7) is annular, and a pressure-bearing inner groove (71) is provided on the inner side of the first pressure-bearing end surface (7), and the pressure-bearing inner groove (71) is opposite to the first sealing protrusion (2) inside and outside; the outer wall with the largest diameter on the first sealing protrusion (2) is a cylindrical surface, and its length is L, and the range of L is 0.05d-0.1d.

2. A multi-seal high-pressure liquid-resistant seal according to claim 1, characterized in that: The cylindrical surface of the first sealing protrusion (2) and the first pressure-bearing end surface (7) are connected via a conical surface (21), and the angle between the conical surface (21) and the first pressure-bearing end surface (7) is α, and the range of α is 30-50°.

3. The multi-seal high-pressure liquid-resistant seal according to claim 1, characterized in that: The side wall of the second sealing protrusion (3) is in an arc shape, and its cross-sectional radius is R, and the range of R is 0.1d-0.2d.

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