Branch pipe clamp for pipeline tapping under pressure

Abstract

A branch pipe clamp for pipeline tapping under pressure comprises a first pipe clamp body and a second pipe clamp body, a through hole is formed in the arch top of the first pipe clamp body, an annular groove is formed in the periphery of the inner end of the through hole, the direction of a groove opening of the annular groove is consistent with the direction of the through hole from outside to inside, and a sealing ring is arranged in the annular groove. The end face, facing the to-be-perforated pipeline, of the sealing ring is a curved face matched with the outer wall of the to-be-perforated pipeline, and a circumferential limit is arranged between the circumferential face of the sealing ring and the groove wall of the annular groove. Under the limiting of the groove wall of the annular groove, the sealing ring can be kept in the annular groove and cannot be separated from the pipe clamp during use; and meanwhile, the circumferential limiting part is arranged between the circumferential surface of the sealing ring and the groove wall of the annular groove to limit circumferential movement of the sealing ring, and the circumferential limiting part and the annular groove are matched with each other, so that even if the sealing ring is not fixed by glue, the relative position between the sealing ring and the pipe clamp can be kept stable, and the sealing performance between the sealing ring and the pipeline is ensured.

Description

Technical Field

[0001] The utility model patent relates to a pipe clamp, specifically to a branch pipe clamp for opening a hole under pressure in a pipeline. Background Art

[0002] Pipeline pressure tapping refers to a technique of machining circular holes on running pipelines by mechanical cutting in a closed state. When the in-service pipelines need to install branch pipes, add or replace valves, replace pipe sections, change lines and transform pipelines, as well as repair, repair and deal with pipeline failures, pipeline pressure tapping construction is adopted, which will not affect the normal transportation of the pipeline and ensure the safety, efficiency and environmental protection of the construction.

[0003] At present, branch pipe clamps are often needed to add small-diameter branch pipes to pipelines. Sealing rings are generally provided at the locations of the adding holes on the pipe clamps to ensure that the medium in the main pipeline flows into the branch pipe through the adding holes without leaking from the gap between the main pipeline and the pipe clamps.

[0004] In the patent document named "Pipeline Branching Pipe Clamp" (document number CN2881279Y, hereinafter referred to as Document 1), an upper pipe clamp, a lower pipe clamp and connecting bolts are disclosed. A through hole perpendicular to the axis of the pipe clamp is opened on the arched top surface of the upper pipe clamp, and a sealing ring is installed at the bottom of the through hole; the inner arc surface of the lower pipe clamp is provided with at least two arc-surface bosses symmetrical to the mid-vertical line of the pipe clamp. The sealing ring has a smooth surface on one side and a toothed surface on the other side, and its smooth surface is attached to the inner wall of the pipe at the bottom of the through hole of the upper pipe clamp. The modified pipe clamp can complete the connection of the branch pipeline without stopping the medium conveying inside the pipeline.

[0005] However, in the prior art, the sealing ring is mostly fixed to the pipe clamp by means of glue. On the one hand, the glue is easy to age and cause the sealing ring to fall off, which has poor stability and affects the sealing performance. On the other hand, the glue may pollute the medium flowing in the pipeline, which is not environmentally friendly. Even in Document 1, except for the toothed surface on the side of the sealing ring that is close to the pipeline, the other surfaces are smooth, which makes it difficult to ensure the stability of the sealing ring in its circumferential direction. Once the sealing ring is deflected, the sealing performance will be affected. Summary of the invention

[0006] The utility model provides a branch pipe clamp for opening a hole under pressure in a pipeline, which eliminates the fixing method of the sealing ring by gluing, improves the connection stability between the sealing ring and the pipe clamp, and avoids contamination of the medium inside the pipeline.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted is: a branch pipe clamp for opening a hole under pressure in a pipeline, comprising a first pipe clamp and a second pipe clamp, a through hole is opened at the top of the bow of the first pipe clamp, an annular groove is arranged on the outer periphery of the inner end of the through hole, the groove opening of the annular groove points in the same direction as the through hole from outside to inside, a sealing ring is arranged in the annular groove, the end face of the sealing ring facing the pipeline to be opened is a curved surface that matches the outer wall of the pipeline to be opened, and a circumferential limit is arranged between the circumferential surface of the sealing ring and the groove wall of the annular groove.

[0008] Compared with the prior art, the technical effect of the utility model is as follows: under the limitation of the groove wall of the annular groove, the sealing ring can be kept in the annular groove during use and will not fall off the pipe clamp; at the same time, a circumferential limit is set between the circumferential surface of the sealing ring and the groove wall of the annular groove to limit the circumferential movement of the sealing ring. The two cooperate with each other, and even if the sealing ring is not fixed with glue, the relative position between the sealing ring and the pipe clamp can be kept stable, thereby ensuring the sealing between the sealing ring and the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the utility model and the pipeline assembly state;

[0010] Figure 2 It is a three-dimensional appearance schematic diagram of the utility model;

[0011] Figure 3 is a schematic diagram of the bottom of the first pipe clamp;

[0012] Figure 4 It is a schematic diagram of the top of the sealing ring;

[0013] Figure 5 It is the schematic diagram of the bottom of the sealing ring;

[0014] Figure 6 for Figure 4 K-direction view in;

[0015] Figure 7 , 8 It is a schematic diagram of a second embodiment of the first pipe clamp and the second pipe clamp. DETAILED DESCRIPTION

[0016] The following is combined with Figure 1-6 And related content, the utility model is further described in detail:

[0017] A branch pipe clamp for opening a hole under pressure in a pipeline comprises a first pipe clamp 10 and a second pipe clamp 20. A through hole 11 is opened at the top of the first pipe clamp 10. An annular groove 12 is arranged on the outer periphery of the inner end of the through hole 11. The notch of the annular groove 12 points in the same direction as the through hole 11 from outside to inside. A sealing ring 30 is arranged in the annular groove 12. The end face 31 of the sealing ring facing the pipeline A to be opened is a curved surface that matches the outer wall of the pipeline A to be opened. A circumferential limit is arranged between the circumferential surface of the sealing ring 30 and the groove wall of the annular groove 12.

[0018] In the above scheme, the pipe A to be drilled is placed in the hole area formed by the first pipe clamp 10 and the second pipe clamp 20, and a hole is drilled at a position on the pipe A to be drilled that is opposite to the through hole 11 at the top of the first pipe clamp 10 to connect a branch pipe. The sealing ring 30 is used to seal the gap between the first pipe clamp 10 and the pipe A to be drilled. In particular, under the limit of the groove wall of the annular groove 12, the sealing ring 30 can be kept in the annular groove 12 when in use without being separated from the first pipe clamp 10. At the same time, by setting a circumferential limit between the circumferential surface of the sealing ring 30 and the groove wall of the annular groove 12, the circumferential movement of the sealing ring 30 is limited, and the circumferential stability of the sealing ring 30 can also be effectively guaranteed. Even if the sealing ring 30 is not fixed with glue, the relative position between the sealing ring 30 and the first pipe clamp 10 can be kept stable. Since the end face of the sealing ring 30 facing the pipe wall of the pipe A to be drilled is a curved surface, it is extremely important to determine its position, so as to ensure the sealing between the sealing ring 30 and the pipe A to be drilled.

[0019] It should be noted that the annular groove 12 can be a groove body in which the inner and outer ring diameters are both larger than the diameter of the through hole 11, or it can be an annular step, that is, the outer ring diameter is larger than the diameter of the through hole 11, and the inner ring and the through hole 11 share a common wall. The sealing ring 30 can be pressed on the step surface formed between the bottom of the annular groove 12 and the wall of the through hole 11.

[0020] As a preferred solution, grooves or protrusions 121 are arranged at circumferential intervals on the groove wall of the annular groove 12, and a convex clamping strip or concave clamping groove 32 is provided on the circumferential surface of the sealing ring 30, which is mutually embedded with the grooves or protrusions 121. The grooves or protrusions 121 and the convex clamping strip or concave clamping groove 32 form a sliding fit in the ring core direction of the sealing ring 30 and a limiting fit in the circumferential direction. Through the guiding and limiting of the convex clamping strip or concave clamping groove 32 by the grooves or protrusions 121, the sealing ring 30 can be conveniently pressed into the groove cavity of the annular groove 12 along the ring core direction for installation and positioning, and at the same time, the circumferential movement of the sealing ring 30 relative to the annular groove 12 can be limited.

[0021] Combination Figure 3 , 4As shown, in order to further improve the circumferential stability of the sealing ring 30 and the annular groove 12, convex clamping strips or concave clamping grooves 32 are arranged on the inner and outer circumferential surfaces of the sealing ring 30 and are arranged correspondingly to the grooves or protrusions 121 on the inner and outer ring groove walls of the annular groove 12. The convex clamping strips or concave clamping grooves 32 and the grooves or protrusions 121 adopt an inner and outer double-layer design to further ensure the circumferential stability of the sealing ring 30 in the annular groove 12.

[0022] As a preferred solution, the groove or protrusion 121 extends from the notch of the annular groove 12 in the groove depth direction to the groove bottom surface of the annular groove 12, and the convex clamping strip or concave clamping groove 32 extends from the edge of the opposite surface of the sealing ring end surface 31 to the sealing ring end surface 31. In this way, when the sealing ring 30 is installed in the annular groove 12, by aligning the convex clamping strip or concave clamping groove 32 on the circumferential surface of the sealing ring 30 with the point position of the groove or protrusion 121 on the annular groove 12, the sealing ring 30 can be pressed into the annular groove 12 to be embedded in the groove cavity of the annular groove 12, and at the same time, the convex clamping strip or concave clamping groove 32 and the groove or protrusion 121 are also mutually embedded, so as to realize the positioning of the sealing ring 30, thereby ensuring that the concave end surface of the sealing ring 30 is reliably attached to the outer pipe wall of the pipe A to be drilled.

[0023] Furthermore, a radially protruding limiting portion 33 is provided on the circumferential surface of the sealing ring 30, and the limiting portion 33 is located in the groove cavity of the limiting groove 122 on the groove wall of the annular groove 12, and the inner end of the limiting groove 122 is connected to the outer groove wall of the annular groove 12. In this solution, the limiting portion 33 and the limiting groove 122 are mutually embedded, which can further limit the ring body of the sealing ring 30 and the annular groove 12 in the circumferential direction.

[0024] Combination Figure 1 , 2 As shown in Figures 5 and 6, the curved surface of the sealing ring 30 that matches the outer wall of the pipe A to be drilled has an annular convex ring 34, and the convex ring 34 is arranged around the outer periphery of the central hole of the sealing ring 30. The convex ring 34 abuts against the outer wall of the pipe A to be drilled as a waterproof line, and it fits tightly with the pipe A to be drilled, thereby improving the sealing performance between the sealing ring 30 and the pipe A to be drilled. At the same time, the convex ring 34 can also play a certain anti-slip role. In this solution, the convex ring 34 can be arranged in multiple layers along the radial spacing of the sealing ring 30 to improve the sealing effect.

Claims

1. A branch pipe clamp for opening a hole under pressure in a pipeline, comprising a first pipe clamp (10) and a second pipe clamp (20), wherein a through hole (11) is formed at the top of the first pipe clamp (10), an annular groove (12) is formed on the inner periphery of the through hole (11), the notch of the annular groove (12) is oriented in the same direction as the through hole (11) from outside to inside, a sealing ring (30) is arranged in the annular groove (12), and the invention is characterized in that: The sealing ring end surface (31) facing the pipe (A) to be drilled is a curved surface that matches the outer wall of the pipe (A) to be drilled, and a circumferential limiter is provided between the circumferential surface of the sealing ring (30) and the groove wall of the annular groove (12).

2. The branch pipe clamp for pipeline pressure tapping according to claim 1, characterized in that: Grooves or protrusions (121) are arranged at intervals in the circumferential direction on the groove wall of the annular groove (12); a convex clamping strip or a concave clamping groove (32) is provided on the circumferential surface of the sealing ring (30) and is mutually embedded with the groove or protrusion (121); the groove or protrusion (121) and the convex clamping strip or the concave clamping groove (32) form a sliding fit in the ring core direction of the sealing ring (30) and form a limiting fit in the circumferential direction.

3. The branch pipe clamp for pipeline pressure tapping according to claim 2 is characterized in that: Convex clamping strips or concave clamping grooves (32) are arranged on the inner and outer peripheral surfaces of the sealing ring (30) and are correspondingly arranged with the grooves or protrusions (121) on the inner and outer ring groove walls of the annular groove (12).

4. The branch pipe clamp for tapping a pipe under pressure according to claim 2 or 3, characterized in that: The groove or protrusion (121) extends from the groove opening of the annular groove (12) in the groove depth direction to the groove bottom surface of the annular groove (12), and the convex clamping strip or concave clamping groove (32) extends from the edge of the surface opposite to the sealing ring end surface (31) to the sealing ring end surface (31).

5. The branch pipe clamp for tapping a pipe under pressure according to claim 1, 2 or 3, characterized in that: A radially protruding limiting portion (33) is provided on the circumferential surface of the sealing ring (30). The limiting portion (33) is located in a groove cavity of a limiting groove (122) on the groove wall of the annular groove (12). The inner end of the limiting groove (122) is connected to the outer groove wall of the annular groove (12).

6. The branch pipe clamp for pipeline pressure tapping according to claim 1, characterized in that: A ring-shaped convex ring (34) is provided on the curved surface of the sealing ring (30) that matches the outer wall of the pipe (A) to be drilled, and the convex ring (34) is arranged around the outer periphery of the central hole of the sealing ring (30).

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