A clamp capable of preventing compression deformation of a sealing ring

Abstract

The application relates to a clamp for preventing compression deformation of a sealing ring and belongs to the technical field of pipeline fittings. The clamp comprises two or more clamp units, each of which is provided with two connecting ends, the clamp units are connected with each other through the two connecting ends to form a pipeline accommodating space, a sealing groove is arranged on the inner ring surface of the clamp unit and extends along the circumference of the clamp unit, the bottom of the sealing groove is provided with a sealing ring pressure relief groove which extends along the circumference of the sealing groove, the sealing ring pressure relief groove is arranged at the middle of the width direction of the sealing groove and has the same length as the sealing groove, and the sealing ring pressure relief groove is recessed from the bottom of the sealing groove to the direction away from the center of the clamp; and the bottom of the sealing groove is provided with sealing lip extrusion parts on the two sides of the sealing ring pressure relief groove. The clamp can effectively prevent compression deformation of the sealing ring, and guarantees the service life and sealing effect of the sealing ring.

Description

Technical Field

[0001] This invention relates to the field of pipe fittings technology, and in particular to a clamp that prevents the compression deformation of the sealing ring. Background Technology

[0002] like Figure 1 As shown, the existing clamp 1 has only one sealing groove on its inner ring surface, meaning that the clamp 1 and the surface of the pipe 2 form a cavity to accommodate the sealing ring 3. When the clamp 1 and the pipe 2 are tightly connected, the sealing ring 3 is compressed by both, forming a... Figure 2 As shown, on the one hand, the sealing groove sidewalls and corners exert a downward oblique compressive force on the sealing ring 3, and the bottom of the sealing groove exerts a vertical downward compressive force on the sealing ring 3, ensuring sufficient compression between the two sealing lips 31 of the sealing ring 3 and the surface of the pipe 2, thus achieving a sealing effect. On the other hand, the middle part of the sealing ring 3 is deformed by the compression from both sides and bends towards the surface of the pipe 2. It can be seen that a large amount of stress is concentrated at the red inflection point of the bend, making this area prone to aging or adhesion, leading to a decrease in the sealing effect or even failure. Furthermore, due to the excessive concentration of stress, the stress at the sealing lips 31 on both sides is too low, which can easily affect the sealing performance between the sealing lips 31 and the surface of the pipe 2.

[0003] Therefore, when using existing clamps, the sealing ring is prone to stress concentration and compression deformation, which in turn causes problems such as aging and adhesion of the sealing ring, ultimately leading to a decrease in sealing effect or even failure. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art and provide a clamp that prevents the sealing ring from being compressed and deformed, thereby ensuring the service life and sealing effect of the sealing ring.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A clamp for preventing compression deformation of the sealing ring includes two or more clamp units. Each clamp unit has two connecting ends, and the clamp units are connected in pairs through the connecting ends to form a pipe accommodating space. The inner ring surface of the clamp unit has a sealing groove along its circumference. The bottom of the sealing groove has a sealing ring pressure relief groove along its circumference. The sealing ring pressure relief groove is located in the middle of the width direction of the sealing groove and has the same length as the sealing groove. The sealing ring pressure relief groove is recessed from the bottom of the sealing groove towards the direction away from the center of the clamp. The bottom of the sealing groove has sealing lip extrusion parts on both sides of the sealing ring pressure relief groove.

[0007] Preferably, the cross-section of the sealing ring pressure relief groove along the width direction is arc-shaped.

[0008] Preferably, the pressure relief groove of the sealing ring and the two sealing lip compression parts are provided with pressure relief guide rounded corners.

[0009] Preferably, the width of the sealing ring pressure relief groove is 0.25-0.90 times the width of the bottom of the sealing groove.

[0010] Preferably, the maximum depth of the pressure relief groove of the sealing ring is 0.02-0.35 times the thinnest thickness of the clamp unit at that location.

[0011] Preferably, the distance between the pressure relief groove of the sealing ring and the two side walls of the sealing groove is the same.

[0012] Preferably, the radius of curvature of the cross-section of the sealing ring pressure relief groove along the width direction is greater than the radius of curvature of the cross-section of the sealing lip extrusion portion along the width direction.

[0013] Preferably, the radius of curvature of the cross-section of the sealing ring pressure relief groove along the width direction is 5.5-6.5 times the radius of curvature of the cross-section of the sealing lip extrusion part along the width direction.

[0014] The advantages of this invention are:

[0015] 1. By setting a pressure relief groove at the bottom of the sealing groove, the interference part of the sealing ring can enter the pressure relief groove, keeping the sealing ring in a relatively relaxed state. This prevents the sealing ring from being squeezed and bent to one side of the pipe, which can cause problems such as aging and adhesion. This ensures the service life and sealing effect of the sealing ring.

[0016] 2. The bottom of the sealing groove has a sealing lip extrusion part on both sides of the sealing ring pressure relief groove to ensure the extrusion effect of the clamp on the sealing lip part of the sealing ring against the pipe surface, thereby avoiding the impact of setting the sealing ring pressure relief groove on the original extrusion sealing effect.

[0017] 3. The design of the ratio between the width of the sealing ring pressure relief groove and the bottom width of the sealing groove can effectively balance the pressure relief effect of the sealing ring pressure relief groove and the squeezing effect of the sealing lip extrusion part on the sealing lip of the sealing ring.

[0018] 4. The arc-shaped structure of the sealing ring pressure relief groove makes the squeezing effect on the sealing ring towards the pipe surface gradually weaken from the edge of the sealing ring pressure relief groove to the center, rather than suddenly and completely canceling the squeezing effect on the sealing ring. On the one hand, it makes the loosening process of the sealing ring more gentle, and on the other hand, it prevents the sealing ring from loosening excessively into the sealing ring pressure relief groove, so as to maintain the sealing ring in a better squeezed state and ensure the sealing effect.

[0019] 5. The pressure relief guide radius between the pressure relief groove of the sealing ring and the extrusion part of the sealing lip ensures that the sealing ring is always slightly tilted towards the pressure relief groove at this position. This allows it to stably enter the pressure relief groove after the extrusion pressure increases, rather than bending towards the pipe surface. At the same time, it makes the change in the state of the sealing ring at this position more gradual and also makes the stress on the sealing ring relatively dispersed, thus ensuring the service life of the sealing ring.

[0020] 6. The design of the ratio between the maximum depth of the sealing ring pressure relief groove and the thickness of the clamp unit is intended to avoid the sealing ring entering the pressure relief groove too much, thus affecting the sealing effect; and to avoid affecting the structural strength of the clamp unit. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the fitting of clamps and pipes in existing technology;

[0022] Figure 2 This is a schematic diagram of the stress distribution of a sealing ring under compression in the prior art;

[0023] Figure 3 This is a front view of the clamp unit body provided in the embodiments of this specification;

[0024] Figure 4 for Figure 3 Sectional view along the middle AA direction;

[0025] Figure 5 for Figure 4 Enlarged structural diagram at point B;

[0026] Figure 6 This is a bottom view of the clamp unit body provided in the embodiments of this specification;

[0027] Figure 7 This is a schematic diagram illustrating the fit between the clamp and the pipe in the embodiments of this specification;

[0028] Figure 8 This is a schematic diagram of the stress distribution of the sealing ring under compression in the embodiments of this specification;

[0029] Figure 7-8 This is a simplified diagram for finite element simulation; the actual structure of the clamp is shown below. Figure 3-6 Subject to;

[0030] In the figure: 1-clamp; 2-pipe; 3-sealing ring; 31-sealing lip; 41-clamp unit; 42-connecting end; 43-sealing groove; 44-sealing ring pressure relief groove; 45-sealing lip compression part; 46-pressure relief guide fillet. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0032] like Figure 3-6 As shown, this embodiment provides a clamp for preventing compression deformation of the sealing ring, including two clamp units 41. Each clamp unit 41 has two connecting ends 42. The two clamp units 41 are connected in pairs through the connecting ends 42 to form a pipe accommodating space. In this embodiment, both connecting ends 42 of the clamp unit 41 are bolt seats, and the two clamp units 41 are connected by bolts at the bolt seats. Of course, this embodiment is also applicable to clamps with other installation methods. Furthermore, this embodiment is also applicable to clamps containing three or more clamp units 41.

[0033] The inner ring surface of the clamp unit 41 is provided with a circumferential sealing groove 43. At the bottom of the sealing groove 43, a circumferential sealing ring pressure relief groove 44 is provided. The sealing ring pressure relief groove 44 is located in the middle of the width direction of the sealing groove 43 and has the same length as the sealing groove 43. The sealing ring pressure relief groove is recessed from the bottom of the sealing groove towards the direction away from the center of the clamp. The bottom of the sealing groove 43 has sealing lip compression portions 45 on both sides of the sealing ring pressure relief groove 44. To compare with existing technologies... Figure 1 and Figure 2 To create a more intuitive comparison, such as Figure 7 and Figure 8 As shown, the sealing groove 43 and the surface of the pipe 2 form the main cavity for accommodating the sealing ring 3, while the sealing ring pressure relief groove 44 and the sealing ring 3 form the secondary cavity for accommodating the sealing ring 3. When the clamp is tightened to the pipe 2, the sealing ring 3 is compressed by both, forming a shape like... Figure 8 As shown, on the one hand, the compressive force exerted by the sidewall of the sealing groove 43 and the sealing lip compression part 45 on the sealing ring 3 ensures sufficient compression between the two sealing lips 31 of the sealing ring 3 and the surface of the pipe 2, achieving a sealing effect. On the other hand, the middle part of the sealing ring 3 is slightly bent into the sealing ring pressure relief groove 44 due to the compression from both sides. In this way, some pressure is released, that is, the overall stress on the sealing ring 3 is reduced. Furthermore, the smaller stress is more evenly distributed within the sealing ring 3, and the sealing ring 3 is in a relatively relaxed state, making it less prone to deformation during long-term use. It can be seen that the stress is relatively large only at the connection between the middle part of the sealing ring 3 and the two sealing lips 31, and then decreases towards the middle part of the sealing ring 3 and the two sealing lips 31. Therefore, the sealing lips 31 also have appropriate stress, which is not too small, thus helping to ensure its sealing performance.

[0034] Specifically, the cross-section of the sealing ring pressure relief groove 44 along its width is arc-shaped. This ensures that the squeezing effect of the sealing ring 3 on the pipe 2 surface gradually weakens from the edge to the center of the sealing ring pressure relief groove 44, rather than abruptly and completely canceling the squeezing effect on the sealing ring 3. This makes the change in the state of the sealing ring 3 more gradual, resulting in a more uniform stress distribution. Furthermore, it prevents the sealing ring 3 from excessively relaxing within the sealing ring pressure relief groove 44, maintaining a better squeezed state for the sealing ring and ensuring a good sealing effect. It should also be noted that... Figure 7 and Figure 8 The main purpose is to visually demonstrate the differences between this embodiment and the prior art, such as... Figure 5 As shown, the actual depth of the sealing ring pressure relief groove 44 is relatively shallow. Even if the sealing ring 3 is completely fitted into the sealing ring pressure relief groove 44, it will not cause large deformation, nor will it cause the stress on the sealing ring 3 to be too small. Therefore, it can effectively balance the service life and sealing performance of the sealing ring.

[0035] like Figure 4 and 5 As shown, the cross-section of the sealing lip extrusion portion 45 along the width direction is also arc-shaped. The radius of curvature of the cross-section of the sealing ring pressure relief groove 44 along the width direction is greater than the radius of curvature of the cross-section of the sealing lip extrusion portion 45 along the width direction. This makes the arc-shaped structure of the sealing ring pressure relief groove 44 more gentle, so that the state change process of the sealing ring 3 entering the sealing ring pressure relief groove 44 is more gentle, thereby making the stress release process of the sealing ring more gentle, and the final state of the sealing ring 3 more relaxed, and the stress distribution more uniform. Specifically, the radius of curvature of the cross-section of the sealing ring pressure relief groove along the width direction is 5.5-6.5 times the radius of curvature of the cross-section of the sealing lip extrusion portion along the width direction. In this embodiment, it is 6 times, and the above effect is better.

[0036] In addition, the pressure relief groove 44 of the sealing ring and the left and right sealing lip extrusion parts 43 are provided with pressure relief guide rounded corners 46, so that the sealing ring 3 is always slightly tilted towards the sealing ring pressure relief groove 44 at this position. This allows it to stably enter the sealing ring pressure relief groove 44 after the extrusion pressure increases, rather than bending towards the surface of the pipe 2. At the same time, it makes the change in the state of the sealing ring 3 at this position more gradual and also makes the stress on the sealing ring 3 at this position relatively dispersed, so as to ensure the service life of the sealing ring.

[0037] Furthermore, the width of the sealing ring pressure relief groove 44 is 0.25-0.90 times the bottom width of the sealing groove 43, and the product models cover DN25 to DN300, which can be set according to the requirements of different product models. In this embodiment, it is specifically 0.70 times, that is, a 0.30 area is left at the bottom of the sealing groove 43 as the sealing lip extrusion part 45, that is, to ensure that the sealing lip extrusion part 45 has a sufficient range to ensure the pressure relief effect of the sealing ring pressure relief groove 44, while also taking into account the extrusion effect of the sealing lip extrusion part 45 on the sealing lip 31, that is, to take into account the sealing effect. It should be noted that the groove opening of the sealing ring pressure relief groove 44 is provided with a pressure relief guide rounded corner 46, and there is also a rounded corner between the sealing lip extrusion part 45 and the side wall of the sealing groove 3. In this embodiment, the width of the groove opening of the sealing ring pressure relief groove 44 refers to Figure 5 The portion w1 includes two pressure relief guide rounded corners 6 on the left and right, while the width of the bottom of the sealing groove 43 refers to... Figure 5 It includes a portion w2 containing two sealing lip compression parts 45 on the left and right.

[0038] Furthermore, the maximum depth of the sealing ring pressure relief groove 44 is 0.02-0.35 times the thinnest thickness of the clamp unit 41 at that location. Product models range from DN25 to DN300, and can be set accordingly based on the requirements of different product models. In this embodiment, it is specifically 0.27 times the thickness of the sealing ring 3 entering the sealing ring pressure relief groove 44. This is to prevent the portion of the sealing ring 3 entering the sealing ring pressure relief groove 44 from being too large, thus loosening the seal and affecting the sealing effect; and also to ensure that the clamp unit 41 has sufficient thickness to avoid affecting its structural strength.

[0039] Finally, the distance between the two side walls of the sealing ring pressure relief groove 44 and the sealing groove 43 is the same, that is, the sealing ring pressure relief groove 44 is located in the middle of the width direction of the sealing groove 43, so as to ensure the balance of force on the sealing ring 3.

[0040] The above are merely preferred embodiments of the present invention, and are implementations based on the overall concept of the present invention. Furthermore, the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A clamp for preventing compression deformation of the sealing ring, comprising two or more clamp units, each clamp unit having two connecting ends, the clamp units being connected in pairs via the connecting ends to form a pipe accommodating space, and the inner ring surface of each clamp unit having a sealing groove along its circumference, characterized in that, The bottom of the sealing groove is provided with a sealing ring pressure relief groove along its circumference. The sealing ring pressure relief groove is located in the middle of the width direction of the sealing groove and is the same length as the sealing groove. The sealing ring pressure relief groove is recessed from the bottom of the sealing groove toward the direction away from the center of the clamp. The bottom of the sealing groove has sealing lip extrusion parts on both sides of the sealing ring pressure relief groove.

2. The clamp for preventing compression deformation of the sealing ring according to claim 1, characterized in that, The cross-section of the pressure relief groove of the sealing ring along the width direction is arc-shaped.

3. The clamp for preventing compression deformation of the sealing ring according to claim 1, characterized in that, The pressure relief groove of the sealing ring and the two sealing lip compression parts are provided with pressure relief guide rounded corners.

4. The clamp for preventing compression deformation of the sealing ring according to claim 1, characterized in that, The width of the pressure relief groove of the sealing ring is 0.25-0.90 times the width of the bottom of the sealing groove.

5. The clamp for preventing compression deformation of the sealing ring according to claim 1, characterized in that, The maximum depth of the pressure relief groove of the sealing ring is 0.02-0.35 times the thinnest thickness of the clamp unit at that location.

6. The clamp for preventing compression deformation of the sealing ring according to claim 1, characterized in that, The distance between the pressure relief groove of the sealing ring and the two side walls of the sealing groove is the same.

7. The clamp for preventing compression deformation of the sealing ring according to claim 2, characterized in that, The radius of curvature of the cross-section of the pressure relief groove of the sealing ring along the width direction is greater than the radius of curvature of the cross-section of the extrusion part of the sealing lip along the width direction.

8. The clamp for preventing compression deformation of the sealing ring according to claim 7, characterized in that, The radius of curvature of the cross-section of the pressure relief groove of the sealing ring along the width direction is 5.5-6.5 times the radius of curvature of the cross-section of the extrusion part of the sealing lip along the width direction.

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