Overall pressure testing device for expansion joint

Abstract

The utility model relates to the technical field of performance testing of pressure pipeline elements such as expansion joints, in particular to an integral pressure testing device for an expansion joint, which comprises a water injection connecting pipe, an end socket assembly and a core pipe assembly. An expansion joint is arranged outside the core tube assembly; the two ends of the core tube assembly are sleeved with the end socket assemblies respectively. The end socket assembly is fixedly connected with the core tube assembly; the core pipe assembly, the two end socket assemblies and the expansion joint form an annular closed cavity; the water injection connecting pipe is arranged on the sealing head assembly; and the water injection connecting pipe is communicated with the annular closed cavity. The utility model aims to provide an integral pressure test device for an expansion joint, which is mainly used on an unconstrained expansion joint, is safe and reliable, and solves the problem of integral pressure test of a large-diameter expansion joint.

Description

Technical Field

[0001] The utility model relates to the technical field of performance testing of pressure pipeline components such as expansion joints, in particular to an overall pressure testing device for expansion joints. Background Art

[0002] In the petrochemical industry, water conservancy, thermal power, and power generation industries, large pipelines are used to transport media such as oil, natural gas, water, and steam. These pipelines will expand and contract due to temperature changes and medium pressure fluctuations. Large-diameter expansion joints are installed in the pipelines to absorb these deformations. The pressure testing device can perform pressure tests on the expansion joints before installation to verify whether the design and manufacture of the expansion joints meet the requirements, ensure that they can withstand the internal pressure of the pipeline during operation, prevent the expansion joints from rupturing due to excessive pressure, and ensure the safe operation of the equipment and system.

[0003] The overall pressure test of large diameter expansion joints is very difficult to operate and there are also great safety hazards. The first thing to consider is the load-bearing capacity of the test device. Large diameter expansion joints are subjected to large pressure, tension and other complex external forces during pressure tests. The device must be able to stably withstand these forces and ensure measurement accuracy. Secondly, sealing performance is the key. For the pressure test of expansion joints, it is necessary to prevent medium leakage and ensure that the pressure is stable during the pressure test. Utility Model Content

[0004] Based on the above technical defects, the purpose of the present utility model is to provide an expansion joint integral pressure test device, which is mainly used for non-constrained expansion joints. The device is safe and reliable and solves the problem of integral pressure testing of large diameter expansion joints.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an expansion joint overall pressure testing device, including a water injection pipe, a head assembly and a core tube assembly; the core tube assembly is provided with an expansion joint outside; the two ends of the core tube assembly are respectively provided with head assemblies; the head assembly is fixedly connected to the core tube assembly; the core tube assembly, the two head assemblies and the expansion joint form an annular closed cavity; the water injection pipe is arranged on the head assembly; the water injection pipe is connected to the annular closed cavity.

[0006] Furthermore, the head assembly includes a hollow butterfly head, an intermediate sleeve, a reinforcing rib plate and a reinforcing ring plate; the intermediate sleeve is outer-circumferentially provided with a reinforcing rib plate, a reinforcing ring plate and a hollow butterfly head; the reinforcing rib plates are evenly arranged along the circumferential direction of the hollow butterfly head; the reinforcing ring plate, the reinforcing rib plate and the intermediate sleeve are welded to each other; the reinforcing rib plate is in contact with the hollow butterfly head.

[0007] Furthermore, the core tube assembly includes a core tube and an inner ring plate; the inner ring plate is arranged in the cavity of the core tube; and the inner ring plates are evenly arranged along the axial direction of the core tube.

[0008] Furthermore, the core tube and the inner ring plate are an integrated molding structure.

[0009] Furthermore, the intermediate sleeve is connected to the core tube by welding.

[0010] Furthermore, one end of the hollow butterfly head is welded to the expansion joint; the other end of the hollow butterfly head is welded to the middle sleeve.

[0011] Furthermore, the fixed connection is a welding connection.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the core tube is used to withstand the pressure thrust during the pressure test, and at the same time, this structure can reduce the amount of water injected into the expansion joint and the injection time during the water pressure test; the design of the intermediate sleeve can make the structure more flexible and more convenient to disassemble; the head assembly improves the structural strength and pressure bearing capacity during the pressure test, thereby ensuring the safety of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 This is a structural diagram of the head assembly of the utility model;

[0015] Figure 3 for Figure 2 A-axis sectional view of the middle head assembly;

[0016] In the figure: 1. Hollow butterfly head, 2. Intermediate casing, 3. Reinforcement rib plate, 4. Reinforcement ring plate, 5. Core tube, 6. Inner ring plate, 7. Expansion joint, 8. Water injection pipe, 9. Weld 1, 10. Weld 2, 11. Weld 3, 12. Weld 4. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] See attached Figure 1-3As shown, an expansion joint integral pressure testing device includes a water injection pipe 8, a head assembly and a core tube assembly; the core tube assembly is provided with an expansion joint 7 on the outside; the two ends of the core tube assembly are respectively provided with head assemblies; the head assembly is fixedly connected to the core tube assembly; the core tube assembly, the two head assemblies and the expansion joint 7 form an annular closed cavity; the water injection pipe 8 is arranged on the head assembly; the water injection pipe 8 is connected to the annular closed cavity.

[0019] It should be noted that water is injected into the annular closed cavity through the water injection pipe 8 so that the water fills the head assembly and the expansion joint 7, and the pressure bearing capacity of the expansion joint 7 is tested by water pressure to confirm whether it can withstand the internal pressure during pipeline operation.

[0020] Furthermore, the head assembly includes a hollow butterfly head 1, an intermediate sleeve 2, a reinforcing rib plate 3 and a reinforcing ring plate 4; the intermediate sleeve 2 is outer-circumferentially provided with a reinforcing rib plate 3, a reinforcing ring plate 4 and a hollow butterfly head 1; the reinforcing rib plate 3 is evenly arranged along the circumferential direction of the hollow butterfly head 1; the reinforcing ring plate 4, the reinforcing rib plate 3 and the intermediate sleeve 2 are welded to each other; the reinforcing rib plate 3 is in contact with the hollow butterfly head 1.

[0021] It should be noted that, refer to the attached Figure 2 As shown, the hollow butterfly head 1, the intermediate sleeve 2, the reinforcing rib plate 3, and the reinforcing ring plate 4 are welded into a head assembly, the reinforcing rib plates 3 are evenly arranged along the circumferential direction of the head, and the reinforcing ring plate 4 is welded to the reinforcing rib plate 3 and the intermediate sleeve 2 at the same time; the role of the reinforcing rib plate 3 and the reinforcing ring plate 4 is to reduce the deformation of the hollow butterfly head 1 during the pressure test, to ensure the total length of the expansion joint 7 during the pressure test and the safety of the entire device during the pressure test; the hollow butterfly head 1 of the present application has a higher pressure-bearing capacity than the blind plate, is evenly stressed, has a relatively simple structure, and has a low manufacturing cost; the intermediate sleeve 2 of the present application is a transition piece, which serves to connect the inner hole of the hollow butterfly head 1 and the core tube 5, and the core function of the intermediate sleeve 2 is to meet the reuse of the hollow butterfly head 1 and the core tube 5.

[0022] Furthermore, the core tube assembly includes a core tube 5 and an inner ring plate 6 ; the inner ring plate 6 is disposed in the cavity of the core tube 5 ; and the inner ring plates 6 are evenly arranged along the axial direction of the core tube 5 .

[0023] Furthermore, the core tube 5 and the inner ring plate 6 are an integrated molding structure.

[0024] Furthermore, the intermediate sleeve 2 is connected to the core tube 5 by welding.

[0025] Furthermore, one end of the hollow butterfly head 1 is welded to the expansion joint 7 ; the other end of the hollow butterfly head 1 is welded to the intermediate sleeve 2 .

[0026] Furthermore, the fixed connection is a welding connection.

[0027] It should be noted that if Figure 1 As shown in the figure, the main technical requirements of an expansion joint integral pressure test device are to meet the test pressure requirements, the device structural parts have no obvious deformation during the pressure test, the stretching and compression of the head assembly are controlled within the allowable range, and the overall length of the expansion joint remains unchanged.

[0028] In addition, one of the structural features of the present invention is the addition of a core tube 5. The main function of the core tube 5 is to withstand the pressure thrust of the expansion joint 7 during the pressure test to ensure that the expansion joint 7 as a whole is not stretched or damaged. At the same time, the diameter of the core tube 5 determines the water volume of the water pressure test and the water injection time of the pressure test. This structure can reduce the water injection volume and water injection time, reduce the pressure test cost and save work hours.

[0029] An inner ring plate 6 is welded to the inner side of the core tube 5, and the inner ring plate 6 is evenly arranged along the axial direction of the core tube 5. The diameter, wall thickness, thickness and arrangement spacing of the core tube 5 and the inner ring plate 6 are designed and calculated in accordance with relevant standards and specifications. The main function of the combined structure of the core tube 5 and the inner ring plate 6 is to improve the ability of the core tube 5 to withstand external pressure. Conventional pressure testing devices do not have this structure. This structure is suitable for the overall pressure test of the large-diameter expansion joint 7.

[0030] The specific installation method of this application is:

[0031] 1. Cutting and welding the core tube 5 and the inner ring plate 6;

[0032] The core tube 5 and the inner ring plate 6 are cut, marked, assembled and welded according to the design drawings to form a core tube assembly;

[0033] 2. Head assembly;

[0034] The intermediate casing 2, the reinforcing rib plate 3 and the reinforcing ring plate 4 are cut, assembled and welded according to the design drawings to finally form the head assembly;

[0035] 3. Installation of head assembly and core tube assembly;

[0036] First, the core tube assembly is inserted into the head assembly on one side and fixed with spot welding. Then the core tube assembly is inserted along the axis of the expansion joint 7 and then into the head assembly on the other side. Adjust the relative positions of the head assemblies on both sides and the end of the expansion joint 7. After the assembly is completed, weld 4 circumferential welds. In this way, the overall pressure test device and the expansion joint 7 form a rigid structure that meets the pressure test requirements. Finally, the pressure test is carried out. Figure 1 shown.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0039] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0041] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

Claims

1. An expansion joint integral pressure test device, characterized by: It includes a water injection pipe, a head assembly and a core tube assembly; the core tube assembly is provided with an expansion joint; both ends of the core tube assembly are respectively sleeved with head assemblies; the head assembly is fixedly connected to the core tube assembly; the core tube assembly, the two head assemblies and the expansion joint form an annular closed cavity; The water injection pipe is arranged on the head assembly; the water injection pipe is connected to the annular closed cavity.

2. The expansion joint integral pressure testing device according to claim 1, characterized in that: The head assembly includes a hollow butterfly head, an intermediate sleeve, a reinforcing rib plate and a reinforcing ring plate; the intermediate sleeve is outer-circumferentially provided with a reinforcing rib plate, a reinforcing ring plate and a hollow butterfly head; the reinforcing rib plates are evenly arranged along the circumferential direction of the hollow butterfly head; the reinforcing ring plate, the reinforcing rib plate and the intermediate sleeve are welded to each other; the reinforcing rib plate is in contact with the hollow butterfly head.

3. The expansion joint integral pressure testing device according to claim 2, characterized in that: The core tube assembly comprises a core tube and an inner ring plate; the inner ring plate is arranged in the cavity of the core tube; and the inner ring plates are evenly arranged along the axial direction of the core tube.

4. The expansion joint integral pressure testing device according to claim 3, characterized in that: The core tube and the inner ring plate are an integrated structure.

5. The expansion joint integral pressure testing device according to claim 3, characterized in that: The middle sleeve is connected to the core pipe by welding.

6. An expansion joint integral pressure testing device according to claim 3 or 5, characterized in that: One end of the hollow butterfly head is connected to the expansion joint by welding; the other end of the hollow butterfly head is connected to the middle sleeve by welding.

7. The expansion joint integral pressure testing device according to claim 1, characterized in that: The fixed connection is a welding connection.

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