Plug device for hydrostatic test of large-diameter nodular cast iron pipe

Abstract

The utility model discloses a plug device for a hydrostatic test of a large-diameter nodular cast iron pipe, and belongs to the technical field of plug devices. The pipeline sealing structure comprises a sealing structure matched with a pipeline in a sealing manner and a reinforcing structure for increasing the pressure resistance of the sealing structure, the sealing structure comprises a sealing plate, a sealing head arranged on the sealing plate and inserted into the pipeline and a fixing hole fixed to the pipeline through a bolt and a nut, and the sealing head is sleeved with a sealing ring A; a reinforcing column is arranged in the center of the sealing plate on the opposite side of the sealing head, a plurality of reinforcing rods are arranged on the sealing plate, one end of each reinforcing rod is connected with the reinforcing column, the other end of each reinforcing rod is connected with one side of the edge of the sealing plate, and threaded holes matched with the reinforcing structures are formed in the reinforcing rods; the sealing structure and the reinforcing structure are correspondingly provided with an exhaust hole, and the exhaust hole of the reinforcing structure is provided with an exhaust valve. The device is used for the large-diameter nodular cast iron pipe hydrostatic test.

Description

Technical Field

[0001] A plugging device for the hydrostatic test of large-diameter ductile iron pipes, which is used for the hydrostatic test of large-diameter ductile iron pipes and belongs to the technical field of plugging devices. Background Art

[0002] For the hydrostatic test of large-diameter ductile iron pipes, after the pipeline installation is qualified and the two sides of the pipeline are backfilled according to the design requirements (the interface shall not be backfilled), the test is carried out in sections. When the system is filled with water, the exhaust valves at the high points of the pipeline shall be opened to exhaust the air. After the water is filled, for example, the design pressure of DN2400 ductile iron pipe is 0.9 Mpa, and the design pressure of DN2200 ductile iron pipe is 1.1 Mpa. When the pressure reaches, keep the pressure constant for 2 minutes, check the interface pipe body for no damage and leakage. If the pressure drops no more than 0.02 MPa in 2 minutes, it can be considered that the tightness test is qualified, the test quality is excellent, and the quality inspector shall make a test record.

[0003] The plugging device for the hydrostatic test of large-diameter ductile iron pipes is usually used to block the end of the pipeline or a specific test section. During the hydrostatic test, a certain part of the pipeline needs to be isolated to apply pressure and check whether it can withstand the pressure level specified by the design, and at the same time detect whether there are leaks or other problems. The specific use position of the plugging device depends on the specific requirements of the test, including: installing a plug at the end of a pipeline system to close the pipeline, then injecting water into this section of the pipeline and applying pressure for testing; if a certain part of the pipeline has been repaired or replaced, usually install a plug near the repaired or replaced section to conduct an independent test on this part; install a plug at the valve or connection of the pipeline system to conduct a pressure test on a specific area, etc.

[0004] The plugging device for the hydrostatic test of large-diameter ductile iron pipes in the prior art is made of high-strength metal, such as steel or cast iron and is combined with a sealing element, and uses bolts and nuts to fix the large-diameter ductile iron pipe. Due to the large diameter of the large-diameter ductile iron pipe, the plugging device has the following technical problems:

[0005] 1. It is large in volume and heavy in weight, resulting in time-consuming and laborious on-site installation and disassembly, and is also prone to construction safety and other problems; 2. The sealing effect is poor, which is prone to leakage during the test process and affects the accuracy of the test results. Summary of the Utility Model

[0006] The purpose of the present utility model is to provide a plugging device for the hydrostatic test of large-diameter ductile iron pipes, which solves the problems in the prior art that it is large in volume and heavy in weight, resulting in time-consuming and laborious on-site installation and disassembly, and is also prone to construction safety and other problems.

[0007] To achieve the above object, the technical solution adopted by the present utility model is as follows:

[0008] A plugging device for the hydrostatic test of large-diameter ductile iron pipes, comprising a sealing structure that is sealingly matched with the pipeline, and a strengthening structure for increasing the compressive resistance of the sealing structure;

[0009] The sealing structure includes a sealing plate, a sealing head disposed on the sealing plate and inserted into the pipeline, and fixing holes for fixing the pipeline through bolts and nuts. A sealing ring A is sleeved on the sealing head;

[0010] At the central position of the sealing plate on the opposite side of the sealing head, a strengthening column is provided. A plurality of strengthening rods are provided on the sealing plate. One end of the strengthening rod is connected to the strengthening column, and the other end is connected to one side of the edge of the sealing plate. Threaded holes for cooperating with the strengthening structure are provided on the strengthening rod;

[0011] Corresponding exhaust holes are provided on the sealing structure and the strengthening structure, and an exhaust valve is provided on the exhaust hole of the strengthening structure.

[0012] Furthermore, a sealing gasket A is provided on the sealing plate outside the sealing head on the sealing ring A, and a mounting hole A corresponding to the threaded hole is provided on the sealing gasket A.

[0013] Furthermore, the strengthening rods are uniformly arranged on the sealing plate along the circumferential direction of the sealing plate.

[0014] Furthermore, the strengthening structure includes a strengthening plate. Grooves for cooperating with the strengthening rods are provided on the strengthening plate. At the position corresponding to the grooves, mounting holes B for cooperating with the threaded holes are provided on the strengthening plate;

[0015] On one side of the groove, a sealing gasket B is provided on the strengthening plate. Mounting holes C corresponding to the mounting holes B are provided on the sealing gasket B located in the groove.

[0016] Furthermore, on one side of the edge of the strengthening plate, an edge sealing plate for sealing the mating part of the sealing structure and the pipeline is provided on the strengthening plate, and a sealing ring B for sealing the mating part of the sealing structure and the pipeline is provided on the edge sealing plate.

[0017] Furthermore, through holes penetrating the strengthening column are also provided on the strengthening plate.

[0018] Furthermore, the strengthening plate is a plate structure; or

[0019] The strengthening plate is composed of multiple unit structures.

[0020] Compared with the prior art, the advantages of the present utility model are as follows:

[0021] 1. The utility model avoids the problem of large volume and heavy weight of an integrated structure through modular cooperation of the sealing structure and the reinforcing structure, thereby improving the installation effect and ensuring construction safety. The sealing structure uses the sealing plate and the sealing head, as well as the sealing ring A, and the plug device can provide a sealing structure that closely cooperates with the inner wall of the pipeline, effectively preventing leakage during the water pressure test. The reinforcing column and the reinforcing rod can increase the pressure resistance of the plug to the sealing structure, improve the stability and pressure resistance of the plug under high pressure environment, and at the same time, it is convenient to cooperate with the reinforcing structure through the threaded hole on the reinforcing rod, which can further enhance the structural strength of the plug and ensure that no structural damage occurs during the high pressure test;

[0022] Second, in the present invention, a sealing gasket A is provided on the sealing ring A, which can further improve the sealing performance of the sealing ring. In particular, under high pressure conditions, the sealing gasket A can serve as an additional sealing layer to prevent the sealing ring A from leaking under high pressure, thereby avoiding leakage during the test process and affecting the accuracy of the test results.

[0023] 3. The utility model limits the reinforcement rods to be evenly distributed around the circumference of the sealing plate, which can improve the structural stability of the entire plug, so that the plug can evenly disperse the stress when under pressure, reduce local stress concentration, and thus enhance the pressure resistance of the plug;

[0024] Fourth, the reinforcement structure in the utility model can increase the structural strength of the plug and improve its pressure resistance. The groove can be used as the installation position of the reinforcement rod to facilitate rapid positioning and installation. The sealing gasket B can also further improve the sealing performance of the plug. For example, when the sealing plate is damaged, it can effectively play a sealing and protective role.

[0025] 5. The utility model sets an edge sealing plate on the reinforcing plate. The purpose of setting the sealing ring B on the edge sealing plate is to seal the edge of the sealing structure and the pipeline joint to ensure that no water or other fluids will leak through the edge during the test, especially in a high-pressure environment, which can improve the reliability of the seal; 6. The purpose of setting the through hole on the reinforcing plate of the utility model is to facilitate quick positioning and installation, and at the same time to achieve the role of preliminary fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a schematic diagram of the structure of the utility model viewed from one side of the reinforcing plate;

[0028] Figure 2 This is a schematic structural view of the present utility model as viewed from one side of the sealing structure;

[0029] Figure 3 is Figure 2 explosion schematic view;

[0030] Figure 4 is Figure 1 explosion schematic view;

[0031] Figure 5 This is a schematic structural view of the sealing structure in the present utility model;

[0032] Figure 6 This is a schematic structural view of the reinforcement structure of the present utility model; In the figure: 1 - sealing structure, 2 - reinforcement structure, 3 - sealing plate, 4 - sealing head, 5 - fixing hole, 6 - sealing ring A, 7 - reinforcing column, 8 - reinforcing rod, 9 - threaded hole, 10 - sealing gasket A, 11 - mounting hole A, 12 - reinforcing plate, 13 - groove, 14 - mounting hole B, 15 - sealing gasket B, 16 - mounting hole C, 17 - edge sealing plate, 18 - sealing ring B, 19 - through hole. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0034] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the present utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 construed as a limitation to the present utility model.

[0036] In addition, terms such as "first", "second", "third", etc., if any, are only used for distinguishing descriptions and shall not be construed as indicating or implying relative importance.

[0037] In addition, terms such as "horizontal", "vertical", "hanging", etc., do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0038] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, terms such as "arranged", "installed", "connected", "coupled", etc., if any, should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] It should be noted that, without conflict, the features in the embodiments of the present utility model can be combined with each other.

[0040] Embodiment 1

[0041] In order to solve the problems that the existing plugging device is large in volume and heavy in weight, resulting in time-consuming and laborious on-site installation and disassembly, and is also prone to construction safety problems. As Figure 1-6 shown, a plugging device for the hydrostatic test of large-diameter ductile iron pipes is provided, which includes a sealing structure 1 that is hermetically fitted with the pipeline, and a strengthening structure 2 that increases the compressive resistance of the sealing structure 1; the sealing structure 1 includes a sealing plate 3, a sealing head 4 arranged on the sealing plate 3 and inserted into the pipeline, and a fixing hole 5 that is fixed to the pipeline by bolts and nuts. A sealing ring A6 is sleeved on the sealing head 4; a strengthening column 7 is arranged at the central position of the sealing plate 3 on the opposite side of the sealing head 4. A plurality of strengthening rods 8 are arranged on the sealing plate 3. One end of the strengthening rod 8 is connected to the strengthening column 7, and the other end is connected to one side of the edge of the sealing plate 3. A threaded hole 9 that cooperates with the strengthening structure 2 is arranged on the strengthening rod 8. An exhaust hole is correspondingly arranged on the sealing structure 1 and the strengthening structure 2. Corresponding to the inside of the pipeline, and an exhaust hole is oppositely arranged at any position on one side of the edge. For example, it is arranged at the corresponding position of the sealing head 4, the sealing plate 3 and the strengthening structure in the area corresponding to between two strengthening rods, and an exhaust valve is arranged on the exhaust hole of the strengthening structure 2, which is an existing exhaust valve and is not shown in the figure.

[0042] In practice, when a large-diameter ductile iron pipe needs to be subjected to a water pressure test, first insert the sealing head 4 with the sealing ring A6 into the end of the pipe, then pass the bolts through the fixing hole 5 on the sealing plate 3 and the hole at the end of the pipe, and fix them with nuts. After fixation, the reinforcement structure is matched with the threaded hole 9 on the reinforcing rod 8 by bolts to fix the reinforcement structure on the sealing structure. After fixation, the exhaust valve provided on it is located on the upper side. When the system is filled with water, the exhaust valve at the top of the pipe should be opened to exhaust the air. After the water is filled, if the pressure reaches the requirement, it can be considered that the tightness test is qualified and the pressure test quality is excellent. The quality inspector should keep a good record of the test, otherwise it will fail. This embodiment avoids the problem of large volume and heavy weight of an integrated structure through modular coordination of the sealing structure and the reinforcement structure, thereby improving the installation effect and ensuring construction safety. The sealing structure uses a sealing plate, a sealing head, and a sealing ring A, and the plug device can provide a sealing structure that fits tightly with the inner wall of the pipe, effectively preventing leakage during the water pressure test. The reinforcement column and the reinforcement rod can increase the pressure resistance of the plug to the sealing structure, improve the stability and pressure resistance of the plug under high-pressure environments, and at the same time, it is convenient to cooperate with the reinforcement structure through the threaded holes on the reinforcement rod, which can further enhance the structural strength of the plug and ensure that no structural damage occurs during high-pressure testing.

[0043] Example 2

[0044] On the basis of Example 1, the sealing ring A6 is provided with a sealing gasket A10 placed on the sealing plate 3 outside the sealing head 4, and the sealing gasket A10 is provided with a mounting hole A11 corresponding to the threaded hole 9. In practice, when a large-diameter ductile iron pipe needs to be subjected to a water pressure test, the sealing head 4 provided with the sealing ring A6 and the sealing gasket A10 is first inserted into the end of the pipe to fix the sealing structure. The sealing gasket A is provided on the sealing ring A to further improve the sealing performance of the sealing ring, especially in a high-pressure environment, the sealing gasket A can serve as an additional sealing layer to prevent the sealing ring A from leaking under high pressure, thereby avoiding leakage during the test process and affecting the accuracy of the test results.

[0045] Example 3

[0046] On the basis of Example 2, the reinforcing rods 8 are evenly arranged on the sealing plate 3 along the circumference direction of the sealing plate 3. By limiting the reinforcing rods to be evenly distributed on the circumference of the sealing plate, the structural stability of the entire plug can be improved, so that the plug can evenly disperse stress when subjected to pressure, reduce local stress concentration, and thus enhance the pressure resistance of the plug.

[0047] Example 4

[0048] Based on Embodiment 3, the reinforcing structure 2 includes a reinforcing plate 12. A groove 13 that cooperates with the reinforcing rod 8 is provided on the reinforcing plate 12. At a position corresponding to the groove 13, a mounting hole B14 that cooperates with the threaded hole 9 is provided on the reinforcing plate 12. On one side of the groove 13, a gasket B15 is provided on the reinforcing plate 12. On the gasket B15 located in the groove 13, a mounting hole C16 corresponding to the mounting hole B14 is provided.

[0049] In practice, aligning each groove 13 with the reinforcing rod 8 will make the mounting hole C16 and the mounting hole B14 correspond to the threaded hole 9. Then, the reinforcing structure is fixed to the sealing structure by screwing a bolt into the threaded hole 9. The reinforcing structure in this embodiment can increase the structural strength of the plug and improve its pressure resistance. The groove can be used as the installation position of the reinforcing rod to facilitate quick positioning and installation. The gasket B can also further improve the sealing performance of the plug. For example, when the sealing plate is damaged, it can effectively play a sealing and protective role. That is, adopting this structure can achieve a double-sealing effect.

[0050] Embodiment 5

[0051] Based on Embodiment 4, on one side of the edge of the reinforcing plate 12, an edge sealing plate 17 for sealing the mating part of the sealing structure 1 and the pipeline is provided on the reinforcing plate 12. A sealing ring B18 for sealing the mating part of the sealing structure 1 and the pipeline is provided on the edge sealing plate 17. The purpose of providing an edge sealing plate on the reinforcing plate and a sealing ring B on the edge sealing plate is to seal the edge of the mating part of the sealing structure and the pipeline (the edge sealing plate seals the edge of the mating part of the sealing structure and the pipeline by sleeving). This ensures that no water or other fluids will leak through the edge during the test, especially in a high-pressure environment, which can improve the reliability of the seal.

[0052] Embodiment 6

[0053] Based on Embodiment 5, a through hole 19 that penetrates through the reinforcing column 7 is further provided on the reinforcing plate 12. The purpose of providing a through hole on the reinforcing plate is to facilitate quick positioning and installation, and at the same time, it can play a role in preliminary fixation.

[0054] Embodiment 6

[0055] Based on Embodiment 5, the reinforcing plate 12 is a plate structure, as Figure 1 shown; or the reinforcing plate 12 is composed of multiple unit structures, such as unit structures formed by symmetrically cutting the reinforcing plate 12.

Claims

1. A plugging device for a large diameter ductile iron pipe water pressure test, characterized in that: It comprises a sealing structure (1) matched with a pipeline seal, and a reinforcing structure (2) for increasing the pressure resistance of the sealing structure (1); The sealing structure (1) comprises a sealing plate (3), a sealing head (4) arranged on the sealing plate (3) and inserted into the pipeline, and a fixing hole (5) fixed to the pipeline by bolts and nuts, and a sealing ring A (6) is sleeved on the sealing head (4); A reinforcing column (7) is arranged at the center of the sealing plate (3) on the opposite side of the sealing head (4); a plurality of reinforcing rods (8) are arranged on the sealing plate (3); one end of the reinforcing rod (8) is connected to the reinforcing column (7), and the other end is connected to one side of the edge of the sealing plate (3); the reinforcing rod (8) is provided with a threaded hole (9) that matches the reinforcing structure (2); An exhaust hole is correspondingly provided on the sealing structure (1) and the reinforcing structure (2), and an exhaust valve is provided on the exhaust hole of the reinforcing structure (2).

2. A plugging device for a large diameter ductile iron pipe water pressure test according to claim 1, characterized in that: The sealing ring A (6) is provided with a sealing gasket A (10) disposed on a sealing plate (3) outside the sealing head (4), and the sealing gasket A (10) is provided with a mounting hole A (11) corresponding to the threaded hole (9).

3. A plugging device for a large diameter ductile iron pipe water pressure test according to claim 2, characterized in that: The reinforcing rods (8) are evenly arranged on the sealing plate (3) along the circumference direction of the sealing plate (3).

4. A plugging device for a large diameter ductile iron pipe water pressure test according to claim 3, characterized in that: The reinforcement structure (2) comprises a reinforcement plate (12), the reinforcement plate (12) being provided with a groove (13) matching with the reinforcement rod (8), and a mounting hole B (14) matching with the threaded hole (9) being provided on the reinforcement plate (12) at a position corresponding to the groove (13); Located at one side of the groove (13), a sealing gasket B (15) is provided on the reinforcing plate (12), and a mounting hole C (16) corresponding to the mounting hole B (14) is provided on the sealing gasket B (15) located in the groove (13).

5. A plugging device for a large diameter ductile iron pipe water pressure test according to claim 4, characterized in that: An edge sealing plate (17) for sealing the fitting portion between the sealing structure (1) and the pipeline is provided on the reinforcing plate (12) at one edge of the reinforcing plate (12), and a sealing ring B (18) for sealing the fitting portion between the sealing structure (1) and the pipeline is provided on the edge sealing plate (17).

6. A plugging device for a large diameter ductile iron pipe water pressure test according to claim 5, characterized in that: The reinforcing plate (12) is also provided with a through hole (19) penetrating the reinforcing column (7).

7. A plugging device for a large diameter ductile iron pipe water pressure test according to claim 6, characterized in that: The reinforcing plate (12) is a plate structure; or the reinforcing plate (12) is composed of a plurality of unit structures.

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