Joint structure for hydrostatic testing of pipes

Abstract

The utility model relates to a joint structure for pipeline hydrostatic test, it is equipped with the end of static pressure pipe, is equipped with the plugging structure in the other end of static pressure pipe, joint structure communicates with high pressure water pipe, and joint structure includes first connecting piece, second connecting piece, first connecting piece is set on static pressure pipe and is sealed fixed, second connecting piece has the through cavity of left and right penetration, and two ends are respectively butt -joint pipe nozzle and connecting cylinder, butt -joint pipe nozzle links with high pressure water pipe, and connecting cylinder is covered in the end of static pressure pipe and is locked fixed on first connecting piece, wherein, the end surface of connecting cylinder has annular groove, and the end of static pressure pipe inserts into annular groove, and the inner ring wall of annular groove of static pressure pipe, outer ring wall between respectively has sealing washer A, sealing washer B. The utility model reaches the beneficial effect is: under the condition of high water pressure, not only will not seal failure, high water pressure will increase the sealing effect instead, and is equipped with multiple sealing structure, is applicable to the hydrostatic test of high water pressure of large diameter pipeline.

Description

Technical Field

[0001] This utility model relates to the technical field of pipeline static pressure testing equipment, and in particular to a joint structure for pipeline static pressure testing. Background Technology

[0002] After production, rubber hoses need to undergo a static pressure test to verify their ability to withstand high pressure. During the static pressure test, a section of hose is cut off, one end is sealed, and the other end is connected to a high-pressure water inlet. The hose is then placed in a tank filled with water; the hose is pressurized to the specified pressure and maintained at that pressure for a certain period of time.

[0003] During static pressure testing, the pipe end needs to be connected to the inlet pipe via an auxiliary joint, which is fixed to the pipe end using a sealing ring and a clamp. If the pipe diameter is small, the static pressure test can proceed normally. However, if the pipe diameter is large, water leakage will usually occur at the auxiliary joint during the test. This is because the sealing ring fails to provide a proper seal to some extent, and no matter how much force the clamp applies, it cannot achieve a good seal. This seal failure leads to inaccurate test results.

[0004] To address this, the inventors improved upon existing auxiliary connectors, ensuring good sealing for both small and large diameter pipes during static pressure tests, thereby improving measurement accuracy. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a joint structure for hydrostatic testing of pipelines, which solves the problem that pressure leakage occurs at the joint during hydrostatic testing of large-diameter pipelines, resulting in inaccurate measurements.

[0006] The purpose of this utility model is achieved through the following technical solution: a joint structure for hydrostatic testing of pipelines, which is located at the end of the hydrostatic pipe and a sealing structure is provided at the other end of the hydrostatic pipe. The joint structure is connected to a high-pressure water pipe. The joint structure includes a first connector and a second connector. The first connector is sleeved on the static pressure pipe and sealed and fixed. The second connector has a through cavity running from left to right, with a connecting nozzle and a connecting sleeve at its two ends. The connecting nozzle is connected to the high-pressure water pipe, and the connecting sleeve is fitted onto the end of the static pressure pipe and locked in place on the first connector. The connecting cylinder has an annular groove at its end face, the end of the static pressure pipe is inserted into the annular groove, and the inner and outer annular walls of the annular groove of the static pressure pipe are respectively equipped with sealing ring A and sealing ring B. In the hydrostatic test, when high-pressure water is injected into the static pressure pipe through the controllable high-pressure water pipe, the high-pressure water presses the sealing ring A against the bottom of the annular groove, forming a primary sealing structure. If there is a leak in the primary sealing structure, the leaking water can push the sealing ring B against the second connector, forming a secondary sealing structure.

[0007] As a preferred technical solution of this application, the second connecting member includes an outer cylinder and an inner cylinder, both coaxial but with different diameters, and an annular groove formed between them. When the static pressure pipe is inserted into the annular groove, the inner cylinder is inserted into the inner wall of the static pressure pipe with an interference / transition fit; a small-diameter annular step A is provided on the outer cylindrical surface of the inner cylinder end, and a sealing ring A is fitted at the annular step A. When the static pressure pipe is inserted into the annular groove, the outer cylinder is fitted on the outer cylindrical surface of the static pressure pipe; a large-diameter annular step B is provided on the inner wall of the outer cylinder end, and a sealing ring B is placed at the annular step B.

[0008] Furthermore, the first connecting member includes a cylindrical part and a flanged plate; the cylindrical part is sealed and fixedly sleeved on the outer cylindrical surface of the static pressure pipe, the flanged plate is annular, the flanged plate and the cylindrical part are integrally formed and their cross sections are L-shaped; the annular step B of the outer cylinder is sleeved on the cylindrical part, and the sealing ring B is limited to the left and right by the step surface of the annular step B and the end face of the cylindrical part.

[0009] Furthermore, the end face of the outer cylinder abuts against the flange plate, and a sealing gasket is provided at the contact point between the two to form a three-level sealing structure.

[0010] As a preferred technical solution of this application, the first connecting member and the second connecting member are clamped and locked by a clamping ring. Alternatively, the first connecting member and the second connecting member are connected and locked by a plurality of circumferentially arranged locking bolts. Alternatively, the first connecting member and the second connecting member are threaded and locked by thread engagement.

[0011] As a preferred technical solution of this application, the plug structure and the connector structure have the same structure. A sealing screw is threaded into the inner diameter of the connector nozzle of the plug structure, and a high-pressure water pipe is sleeved on the outer cylindrical surface of the connector nozzle of the connector structure.

[0012] To facilitate understanding, the working principle of this solution will be explained as follows: In existing related technologies, when a static pressure pipe is connected to a high-pressure water pipe through an auxiliary joint, the auxiliary joint is sealed to the static pressure pipe through a sealing ring. When the water pressure reaches a particularly high level, the sealing ring is prone to failure (especially for large-sized static pressure pipes).

[0013] In this design: when high-pressure water is introduced, the high water pressure will compress sealing ring A. Sealing ring A is limited by the annular step A, causing it to deform and seal the gap between the static pressure pipe and the inner cylinder. If sealing ring A experiences a certain degree of sealing failure, some water will enter the gap between the outer cylinder and the static pressure pipe. This water in the gap is then sealed by sealing ring B (if the water pressure in the gap is high enough, it will deform sealing ring B (the other side of sealing ring B is limited by the first connecting piece). This deformation of sealing ring B further enhances the seal between the outer cylinder and the static pressure pipe). Furthermore, a three-stage seal is formed by the sealing gasket between the outer cylinder and the flange plate.

[0014] This invention has the following advantages: compared with the prior art, it will not fail to seal under high water pressure, but the high water pressure will actually increase the sealing effect; and the sealing effect is improved by designing a multi-seal structure; it is suitable for hydrostatic tests of large-diameter pipes under high water pressure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 AA magnified image in the image; Figure 3 A schematic diagram of a structure for fixing the first connecting piece onto the static pressure pipe; Figure 4 A schematic diagram of a semi-circular clamp replaced with a clamp; Figure 5 This is a schematic diagram of the second connector. In the diagram: 10-static pressure pipe, 20-first connector, 2001-cylinder section, 2002-flanged disc, 31-connecting nozzle, 32-connecting cylinder, 3201-annular groove, 3202-outer cylinder, 3203-inner cylinder, 33-sealing ring A, 34-sealing ring B, 35-sealing gasket, 30-second connector, 40-semi-circular clamp. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0017] It should be noted that in existing technologies, after the rubber hose is manufactured, its pressure-bearing capacity needs to be tested (a section of the hose is cut and the water pressure at which it will burst is measured). Typically, a box (or tank or cylinder) is set up, one end of the rubber hose is sealed, and the other end is connected to a high-pressure water pipe. The rubber hose is then placed in the box filled with water (the water in the box acts as a buffer in case the hose bursts, preventing injury). High-pressure water is injected into the rubber hose through a pump and a pressure gauge is installed on the high-pressure water pipe. The pressure of the injected high-pressure water is observed by the pressure gauge, and once the pressure reaches the specified level, it is maintained for a certain period of time.

[0018] At the connection point between the rubber hose and the high-pressure water pipe: the rubber hose and the high-pressure water pipe are connected by an auxiliary joint structure. This auxiliary joint includes an L-shaped annular component and a conical connector. The annular component is fixedly fitted onto the end of the static pressure pipe. One end of the conical connector is a large-diameter cylindrical shape, while the other end is a small-diameter connecting nozzle (with a through-channel cavity from one end to the other). The cylindrical end of the conical connector is fitted onto the static pressure pipe, and a sealing ring is provided between the two. Then, a clamp connects the L-shaped annular component and the cylindrical end of the conical connector. The small-diameter connecting nozzle is connected to the connector of the high-pressure water pipe via threads. The problem is that when the high-pressure water reaches a certain height, the seal of the sealing ring fails, leading to pressure loss. This prevents the upper limit of the injected water pressure from being increased, thus making it impossible to perform hydrostatic pressure tests on some rubber pipes.

[0019] This utility model offers a solution by redesigning the structure of the auxiliary joint between the rubber hose and the high-pressure water pipe. The pressure generated by the injected high-pressure water compresses the corresponding sealing ring (this compression enhances the sealing effect), thus preventing leakage and pressure loss. Furthermore, a multi-layered sealing structure is designed to further ensure the sealing effect.

[0020] The following specific embodiments further illustrate the concept of this utility model (it should be noted that, without conflict, the embodiments, features and technical solutions in the embodiments of this utility model can be combined with each other).

[0021] like Figures 1-3 As shown in the figure, this specific embodiment provides a joint structure for hydrostatic testing of pipelines. The joint structure is located at one end of the static pressure pipe 10, and a sealing structure is provided at the other end of the static pressure pipe 10. The joint structure is connected to a high-pressure water pipe. The joint structure includes a first connector 20 and a second connector 30. The first connector 20 is fitted onto the static pressure pipe 10 and is sealed and fixed. The second connector 30 includes a small-diameter connecting nozzle 31 and a large-diameter connecting cylinder 32. One end of the connecting nozzle 31 is connected to one end of the connecting cylinder 32 through a conical shell, and the three are integrally formed. Furthermore, an annular groove 3201 is provided at the end face of the connecting cylinder 32. During connection and installation, the first connector 20 is fitted onto the end of the static pressure pipe 10 and sealed and fixed (as is existing technology, such as fixing with glue). A sealing ring A33 is placed on the inner ring wall of the annular groove 3201, and a sealing ring B34 is placed on the outer ring wall of the annular groove 3201. Then, the end of the static pressure pipe 10 is inserted into the annular groove 3201, and the inner wall of the static pressure pipe 10 is sealed with the inner ring wall of the annular groove 3201 by the sealing ring A33, and the outer cylindrical surface of the static pressure pipe 10 is sealed with the outer ring wall of the annular groove 3201 by the sealing ring B34. In the hydrostatic test, when high-pressure water is injected into the static pressure pipe 10 through the high-pressure water pipe, the high-pressure water will press the sealing ring A33 against the bottom of the annular groove 3201, forming a primary sealing structure. If there is a leak in the primary sealing structure, and the amount of leaked water is large enough, the leaked water can push the sealing ring B34 against the second connecting piece 30, forming a secondary sealing structure. In both the primary and secondary sealing structures, sealing is achieved by deforming the corresponding sealing rings through water pressure. The higher the water pressure, the better the effect (compared to existing sealing methods, this solution is less prone to sealing failure under high water pressure).

[0022] The structure of the second connector 30 will be further explained below.

[0023] See Figure 2 , Figure 5 In the second connecting member 30, the connecting cylinder 32 includes an outer cylinder 3202 and an inner cylinder 3203. The diameter of the inner cylinder 3203 is smaller than that of the outer cylinder 3202. One end of the inner cylinder 3202 is welded and sealed to the conical shell. The outer cylinder 3202 and the inner cylinder 3203 are on the same axis, and an annular groove 3201 is formed between the outer cylinder 3202 and the inner cylinder 3203. In addition, there is a small-diameter annular step A on the outer cylindrical surface at the end of the inner cylinder 3203, and a sealing ring A33 is fitted on the annular step A (when the static pressure pipe 10 is inserted into the annular groove 3201, the sealing ring A33 is not easy to fall off); and there is a large-diameter annular step B on the inner wall at the end of the outer cylinder 3202, and a sealing ring B34 is placed on the annular step B. When the static pressure pipe is inserted into the annular groove for installation, the inner cylinder 3203 is inserted into the inner wall of the static pressure pipe 10 with an interference / transition fit between them, and the outer cylinder 3202 is sleeved on the outer cylindrical surface of the static pressure pipe 10 with a certain gap between them. During the hydrostatic test, the high water pressure will squeeze the sealing ring A33. The sealing ring A33 is limited by the annular step A, so the sealing ring A33 deforms and seals the gap between the static pressure pipe 10 and the inner cylinder 3203. If the sealing ring A33 fails to seal to a certain extent, some water will enter the gap between the outer cylinder 3202 and the static pressure pipe 10. The water in the gap is then sealed by the sealing ring B. (If the water pressure in the gap is high enough, it will squeeze and deform the sealing ring B34 (the other side of the sealing ring B34 is limited by the first connecting piece 20). The deformation of the sealing ring B34 can better seal the gap between the outer cylinder 3202 and the static pressure pipe 10.)

[0024] The structure of the first connector 20 will be further explained below.

[0025] See Figure 2 The first connecting member 20 includes a cylindrical portion 2001 and a flanged disc 2002. The cylindrical portion 2001 is sealed and fixedly fitted onto the outer cylindrical surface of the static pressure pipe 10. The flanged disc 2002 is annular and integrally formed with the cylindrical portion 2001, and both have an L-shaped cross-section. Furthermore, the annular step B of the outer cylinder 3202 is fitted onto the cylindrical portion 2001, so the sealing ring B34 is left and right limited by the step surface of the annular step B and the end face of the cylindrical portion 2001.

[0026] Furthermore, participation Figure 2 When the outer cylinder 3202 is fitted onto the static pressure pipe 10, the end face of the outer cylinder 3202 abuts against the flange plate 2002, and a sealing gasket 35 is provided at the contact point between the two, thus forming a three-level sealing structure.

[0027] The locking structure between the first connector 20 and the second connector 30 will be further explained below.

[0028] participate Figure 2 and Figure 4 The first connecting member 20 and the second connecting member 30 are clamped and locked by the clamping ring 40. Specifically, the clamping ring 40 includes two hinged semi-circular clamps, each with a limiting groove on its inner wall. Since the first connecting member 20 has a flange 2002 and an annular protrusion on the outer cylindrical surface of the outer cylinder 3202, when the two semi-circular clamps are clamped onto the first and second connecting members, the flange 2002 and the annular protrusion are located in the limiting groove and fit against the side wall of the limiting groove. Then, the two semi-circular clamps are locked with corresponding bolts.

[0029] Alternatively, the locking method can be used as follows: the flange 2002 of the first connector 20 has multiple holes circumferentially, and the outer cylindrical surface of the outer cylinder 3202 of the second connector 30 has an annular protrusion with corresponding holes. The flange 2002 and the annular protrusion are connected and locked together by a locking screw.

[0030] Alternatively, the locking method can be as follows: the annular step B of the second connector 30 is fitted onto the cylindrical portion 2001 of the first connector 20, and the two are connected by threads.

[0031] The plug structure will be further explained below.

[0032] It should be noted that in this embodiment, the plug structure and the connector structure have the same structure. A sealing screw is threaded into the inner diameter of the connector nozzle 31 of the plug structure, and a high-pressure water pipe is sleeved on the outer cylindrical surface of the connector nozzle 31 of the connector structure.

[0033] The above embodiments only illustrate preferred implementation methods, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A joint structure for hydrostatic testing of a pipeline, wherein the joint structure is located at one end of a hydrostatic pipe (10), and a sealing structure is provided at the other end of the hydrostatic pipe (10), and the joint structure is connected to a high-pressure water pipe, characterized in that: The connector structure includes a first connector (20) and a second connector (30); The first connector (20) is sleeved on the static pressure pipe (10) and sealed and fixed; The second connector (30) has a through cavity running through the left and right sides, and its two ends are a connecting nozzle (31) and a connecting cylinder (32) respectively. The connecting nozzle (31) is connected to the high-pressure water pipe, and the connecting cylinder (32) is fitted onto the end of the static pressure pipe (10) and locked and fixed on the first connector (20). Among them, the end face of the connecting cylinder (32) has an annular groove (3201), the end of the static pressure pipe (10) is inserted into the annular groove (3201), and the inner and outer annular walls of the annular groove (3201) of the static pressure pipe (10) have sealing ring A (33) and sealing ring B (34) respectively. In the hydrostatic test, when high-pressure water is injected into the static pressure pipe (10) through the controllable high-pressure water pipe, the high-pressure water presses the sealing ring A (33) against the bottom of the annular groove (3201) to form a primary sealing structure; if the primary sealing structure leaks, the leaked water can push the sealing ring B (34) against the second connector (30) to form a secondary sealing structure.

2. The joint structure for hydrostatic testing of pipelines according to claim 1, characterized in that: In the second connector (30), the connecting cylinder (32) includes an outer cylinder (3202) and an inner cylinder (3203) that are coaxial but have different diameters and form an annular groove (3201) between them. When the static pressure pipe is inserted into the annular groove, the inner cylinder (3203) is inserted into the inner wall of the static pressure pipe (10) and the two are in an interference / transition fit; there is a small-diameter annular step A at the outer cylindrical surface of the end of the inner cylinder (3203), and a sealing ring A (33) is fitted at the annular step A. When the static pressure pipe is inserted into the annular groove, the outer cylinder (3202) is fitted onto the outer cylindrical surface of the static pressure pipe (10); there is a large-diameter annular step B at the inner wall of the end of the outer cylinder (3202), and a sealing ring B (34) is placed at the annular step B.

3. The joint structure for hydrostatic testing of pipelines according to claim 2, characterized in that: The first connector (20) includes a cylindrical portion (2001) and a flanged plate (2002). The cylindrical part (2001) is sealed and fixedly sleeved on the outer cylindrical surface of the static pressure tube (10). The flange plate (2002) is annular and is integrally formed with the cylindrical part (2001) and the cross-section of both is L-shaped. The annular step B of the outer cylinder (3202) is sleeved on the cylinder (2001), and the sealing ring B (34) is limited to the left and right by the step surface of the annular step B and the end face of the cylinder (2001).

4. The joint structure for hydrostatic testing of pipelines according to claim 3, characterized in that: The end face of the outer cylinder (3202) abuts against the flange plate (2002), and a sealing gasket (35) is provided at the contact point between the two to form a three-level sealing structure.

5. The joint structure for hydrostatic testing of pipelines according to any one of claims 1 to 4, characterized in that: The first connector (20) and the second connector (30) are clamped and locked by the clamping ring (40).

6. The joint structure for hydrostatic testing of pipelines according to any one of claims 1 to 4, characterized in that: The first connector (20) and the second connector (30) are connected and locked by a plurality of circumferentially arranged locking bolts.

7. The joint structure for hydrostatic testing of pipelines according to any one of claims 1 to 4, characterized in that: The first connector (20) and the second connector (30) are threaded together for thread locking.

8. The joint structure for hydrostatic testing of pipelines according to any one of claims 1 to 4, characterized in that: It also includes a plug structure, which has the same structure as the connector structure. A sealing screw is threaded into the inner diameter of the connector nozzle (31) of the plug structure, and a high-pressure water pipe is fitted on the outer cylindrical surface of the connector nozzle (31) of the connector structure.

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