A sealing device for pressure testing of underground water supply pipes

Abstract

The application relates to a sealing device for pressure testing of an underground water supply pipeline, belonging to the technical field of pipeline pressure testing. The sealing device comprises a sealing end cap, one side of the sealing end cap is provided with a filling cavity capable of expanding or shrinking, the outer wall of the filling cavity is in contact with the pipeline opening of the underground water supply pipeline and seals the pipeline opening; at least two supporting arms are further arranged on the sealing end cap, each supporting arm is connected with a clamping block through an extension structure, the extension direction of the extension structure is towards the sealing end cap, the extension direction of the extension structure and the axis of the underground water supply pipeline form an included angle, the clamping block can be in contact with the outer wall of the underground water supply pipeline, and the underground water supply pipeline is clamped between the supporting arms. The filling cavity is arranged, the filling cavity is in contact with the pipeline opening to be tested, the pipeline opening can be sealed when the filling cavity expands, and the pipeline opening of different shapes can also be well sealed.

Description

Technical Field

[0001] This invention relates to the field of pressure testing technology for pipelines under test, and more particularly to a sealing device for pressure testing of underground water supply pipelines. Background Technology

[0002] Water supply pipes are used to supply water to a certain area. In recent years, with the development of the times and the improvement of living standards, there are more and more materials for pipes, and they are becoming more and more durable. Water supply pipes will use different materials depending on different users and occasions.

[0003] During pipeline construction, pressure tests are required on pipes of different materials. First, the pipe ends need to be sealed. Then, a test liquid with a certain pressure is injected into the pipe and maintained at the test pressure for a specified time. Currently, there are several main methods for sealing the pipe ends under test: The first is the welding method, where a connecting flange is welded to the pipe end, and then bolted to a blind flange to achieve a seal. Alternatively, the sealing plate can be directly welded to the pipe end. The second is the symmetrical clamping method, used for straight pipes with shorter lengths. Blind flanges with through holes are installed at both ends of the pipe, and then long bolts are used to simultaneously lock and fix the two blind flanges, thus achieving a seal at the pipe end under pressure.

[0004] In the prior art, many water supply pipes have various connection structures at their ends due to assembly requirements. Most of these connection structures are installed on the pipes before they leave the factory. For example, Chinese Patent Publication No. CN112901868B discloses a connection structure and construction method for a municipal water supply pipe. The key points of its technical solution are: it includes a first splicing pipe, a second splicing pipe, a connecting sleeve, a first limiting sleeve, a second limiting sleeve, a first limiting ring, and a second limiting ring; the first limiting sleeve is fitted onto the first splicing pipe, and a first annular limiting boss is fixedly connected to the first limiting sleeve, and the first limiting ring is fitted onto and fixed to the first splicing pipe; the second limiting sleeve is fitted onto the second splicing pipe, and a second annular limiting boss is fixedly connected to the second limiting sleeve, and the second limiting ring is fitted onto and fixed to the second splicing pipe; the two ends of the connecting sleeve are threaded to the first limiting sleeve and the second limiting sleeve, respectively. At this time, the first annular limiting boss abuts against and limits the first limiting ring, and the second annular limiting boss abuts against and limits the second limiting ring. This application has the function of improving the ease of installation of splicing pipes.

[0005] In the aforementioned patent documents, the end of the pipeline under test has a pre-set positioning and insertion structure. When the pipeline under test is pressure tested, neither the welding method nor the symmetrical clamping method can achieve a seal at its end, making it impossible to conduct a pressure test on the pipeline under test during pipeline construction. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a sealing device for pressure testing of underground water supply pipelines. This device can seal pipelines of different shapes to assist in completing the pressure test.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0010] In a first aspect, embodiments of the present invention provide a sealing device for pressure testing of underground water supply pipelines, used to seal the underground water supply pipeline to be tested, including a sealing end cap, one side of which is provided with a filling cavity that can expand or contract, the outer wall of the filling cavity contacting the pipe opening of the underground water supply pipeline and sealing the pipe opening.

[0011] The sealing end cap is also provided with at least two support arms. Each support arm is connected to the clamping block through a telescopic structure. The extension direction of the telescopic structure is towards the sealing end cap. The telescopic direction of the telescopic structure is at an angle to the axis of the underground water supply pipe. The clamping block can contact the outer wall of the underground water supply pipe and clamp the underground water supply pipe between the support arms.

[0012] Optionally, the material of the elastic pad is selected from one of fluororubber, nitrile rubber and silicone rubber.

[0013] Optionally, the sealing end cap is provided with an oil injection cavity, which is connected to the telescopic structure.

[0014] Optionally, the telescopic structure is a hydraulic telescopic structure, and the support arm is provided with a flow guide cavity. The hydraulic telescopic structure is connected to the oil injection cavity through the flow guide cavity.

[0015] Optionally, the sealing end cap is provided with an oil injection pipe, which is connected to the oil injection cavity, and the oil injection pipe is provided with a control valve.

[0016] Optionally, the sealing cap includes a rigid cap body and an elastic pad. The oil injection cavity is disposed in the rigid cap body. The rigid cap body forms a groove on the side facing the clamping block. The elastic pad is connected to the end of the groove facing the clamping block and together with it forms the filling cavity. Injecting air or hydraulic oil into the filling cavity can cause the elastic pad to expand towards the clamping block.

[0017] Optionally, the bottom wall of the groove is provided with a channel that connects the oil injection cavity and the filling cavity, and a solenoid valve is provided on the channel.

[0018] Optionally, the clamping block has an arc-shaped groove on the side near the outer wall of the underground water supply pipe.

[0019] Optionally, the support arm is provided with a solvent box containing a solvent for dissolving the sealant.

[0020] Optionally, the sealing cap is disc-shaped, and the diameter of the sealing cap is greater than or equal to the diameter of the underground water supply pipe.

[0021] Secondly, embodiments of the present invention provide a method for using a sealing device for pressure testing of underground water supply pipelines. The sealing cap is placed at the port of the pipeline to be tested, one end of the oil injection pipe is connected to the output end of a hydraulic oil pump, and the control valve is opened while the solenoid valve is closed. Hydraulic oil is injected into the oil injection cavity of the sealing cap through the oil injection pipe, causing the telescopic cylinder to extend outwards, and the hydraulic telescopic structure to push the clamping block to clamp the pipeline to be tested.

[0022] Then, the solenoid valve is opened, allowing hydraulic oil to flow into the filling chamber, causing the elastic pad to fit tightly against the end of the pipe under test, thus completing the clamping and sealing of the underground water supply pipe at one end. Pressure testing liquid is then injected from the other end of the pipe to perform a pressure test on the underground water supply pipe.

[0023] When the diameter of the pipe to be tested is large, sealant can be manually applied along the joint between the elastic pad and the pipe end. Before dismantling the device, the sealant solvent stored in the solvent tank can be sprayed out using an electric nozzle to dissolve and remove the sealant without affecting the reuse of the device.

[0024] (III) Beneficial Effects

[0025] The beneficial effects of this invention are as follows: This invention provides a sealing device for pipeline pressure testing. By incorporating an expandable or contractible elastic pad, which contacts the pipe opening to be tested, the elastic pad can seal the pipe opening when it expands. This device provides effective sealing for pipe openings of various shapes. Furthermore, by providing at least two support arms, the pipe is clamped between the support arms, ensuring the sealing cap is firmly attached to the pipe opening, thus improving the sealing effect.

[0026] The elastic pad of this invention is made of a flexible material, and its expansion results in a tighter seal with the pipe opening. By limiting the material of the elastic pad, this invention enables it to withstand high temperatures, strong oxidants, acids and alkalis, and high pressures, making it suitable for various types of pipe testing. Furthermore, it can withstand the pressure applied by hydraulic oil without easily breaking or damaging itself.

[0027] The clamping block of the device of the present invention has an arc-shaped end near the pipe to be tested, which facilitates better contact with the outer wall of the pipe and reduces the likelihood of shaking, thereby enhancing the stability of the clamping. In addition, a protective pad is attached and fixed to the inner wall of the arc-shaped recess. The protective pad can protect the outer wall of the pipe to be tested, preventing the clamping block from damaging the outer wall of the pipe and affecting the service life of the pipe. Secondly, it can greatly increase the friction between the clamping block and the pipe to be tested, making the clamping more stable.

[0028] After the elastic pad and the port of the pipe under test are tightly fitted to form a seal, to further seal the pipe, a layer of epoxy resin sealant can be manually applied along the joint between the elastic pad and the port of the pipe under test. This ensures a tight seal and adds an extra layer of assurance for the success of the pressure test. After the test is completed, the sealant solvent stored inside the solvent box is sprayed out, causing the applied sealant to dissolve on its own, eliminating the need for manual removal. This saves time and effort and facilitates the reuse of the device. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the sealing device used for pipeline pressure testing in an embodiment of the present invention.

[0030] Figure 2 for Figure 1 Schematic diagrams of the structure from different angles.

[0031] Figure 3 for Figure 2 The main view.

[0032] Figure 4 This is a longitudinal sectional view of the sealing end cap in an embodiment of the present invention.

[0033] Figure 5 This is an exploded view of the force applied by the clamping block when the pipe is clamped according to the present invention.

[0034] Figure 6 This is a schematic diagram of the hydraulic telescopic structure in an embodiment of the present invention.

[0035] Figure 7 for Figure 6 A magnified view of part A in the middle.

[0036] [Explanation of Labels in the Attached Image]

[0037] 1: Sealing end cap; 2: Oil injection pipe; 3: Control valve; 4: Mounting base; 5: Support arm; 6: Hydraulic telescopic structure; 601: Fixed pipe; 602: Telescopic cylinder; 603: Limiting block; 604: Limiting groove; 605: Sealing assembly; 7: Clamping block; 8: Elastic pad; 9: Solvent box; 10: Electric nozzle; 11: Flow guide cavity; 12: Partition plate; 13: Solenoid valve. Detailed Implementation

[0038] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0040] refer to Figures 1-7 This invention protects a sealing device for pressure testing of underground water supply pipelines, used to seal the underground water supply pipeline to be tested, including a sealing end cap 1, one side of which is provided with a filling cavity that can expand or contract, and the outer wall of the filling cavity contacts the pipe opening of the underground water supply pipeline and seals the pipe opening.

[0041] The sealing end cap 1 is also provided with at least two support arms 5. Each support arm 5 is connected to the clamping block 7 through a telescopic structure. The extension direction of the telescopic structure is towards the sealing end cap 1. The telescopic direction of the telescopic structure is at an angle to the axis of the underground water supply pipe. The clamping block 7 can contact the outer wall of the underground water supply pipe and clamp the underground water supply pipe between each support arm 5.

[0042] This invention utilizes an elastic pad 8 that contacts the pipe opening to be tested. When the elastic pad 8 expands, it seals the pipe opening, providing a good seal for pipe openings of various shapes. By providing at least two support arms 5, the pipe is clamped between the support arms 5, ensuring the sealing cap 1 is firmly attached to the pipe opening, thus improving the sealing effect. Specifically, when there are two support arms 5, they are positioned opposite each other. When there are three support arms 5, they are arranged in an equilateral triangle.

[0043] In one specific embodiment, the material of the elastic pad 8 is selected from fluororubber, nitrile rubber and silicone rubber.

[0044] In one specific embodiment, the sealing end cap 1 is provided with an oil injection cavity, which is connected to the telescopic structure. The oil injection cavity can be an oil injection hydraulic cavity.

[0045] In one specific embodiment, the telescopic mechanism is a hydraulic telescopic structure 6, and the support arm 5 is provided with a guide cavity 11. The hydraulic telescopic structure 6 is connected to the oil injection cavity through the guide cavity 11.

[0046] In one specific embodiment, the sealing end cap 1 is provided with an oil injection pipe 2, which is connected to the oil injection cavity, and the oil injection pipe 2 is provided with a control valve 3.

[0047] In a specific embodiment, the sealing end cap 1 includes a rigid cap body and an elastic pad. The oil injection cavity is provided in the rigid cap body. A groove is formed on one side of the rigid cap body facing the clamping block 7. The elastic pad 8 is connected to one end of the groove facing the clamping block 7 and together with it encloses a filling cavity. Injecting air or hydraulic oil into the filling cavity can cause the elastic pad 8 to expand towards the clamping block 7. The filling cavity can be a filling hydraulic cavity.

[0048] In a specific embodiment, a channel is provided on the bottom wall of the groove. The channel can connect the oil injection cavity and the filling cavity, and a solenoid valve 13 is provided on the channel.

[0049] In a specific embodiment, an arc-shaped groove is provided on one side of the clamping block 7 close to the outer wall of the underground water supply pipe.

[0050] In a specific embodiment, a solvent box 9 is provided on the support arm 5, and a solvent for dissolving the sealing glue is provided in the solvent box 9.

[0051] In a specific embodiment, the sealing end cap 1 is disc-shaped, and the diameter of the sealing end cap 1 is greater than or equal to the diameter of the underground water supply pipe.

[0052] The following are specific embodiments.

[0053] Embodiment 1:

[0054] As Figures 1 to 7 shown, an external sealing device for pressure testing of an underground water supply pipe to be measured according to a preferred embodiment of the present invention includes a sealing end cap 1. The inside of the sealing end cap 1 is a hollow structure, and one side close to the pipe to be measured is open, for sealing the end of the pipe to be measured.

[0055] Refer Figure 2 、 Figure 3 and Figure 4 shown, an elastic pad 8 suitable for sealing the special-shaped port of the pipe to be measured is installed on the sealing end cap 1. The material of the elastic pad 8 can be one of fluororubber, nitrile rubber, and silicone rubber. The elastic pad 8 is bonded and fixed on one side of the sealing end cap 1 by high-strength glue.

[0056] In this embodiment, the elastic pad 8 preferably selects fluororubber material with high temperature resistance, strong oxidant resistance, oil resistance, acid and alkali resistance, and is usually used in high temperature, high vacuum and high pressure environments, and is also suitable for oil environments. It can well withstand the pressure exerted by hydraulic oil on it and is not prone to breakage and damage.

[0057] Refer Figure 1 、 Figure 2 and Figure 3As shown, the support arm 5 is installed on the sealing end cap 1. The support arm 5 is used to assist in supporting and fixing the sealing end cap 1. A plurality of mounting seats 4 are fixedly connected to the circumferential curved surface of the sealing end cap 1, and the support arm 5 is fixedly connected to the mounting seat 4. Four groups of mounting seats 4 are evenly welded on the circumferential curved surface of the sealing end cap 1.

[0058] Among them, as shown in Figure 1 、 Figure 2 and Figure 3 Four groups of through holes are evenly formed on the circumferential curved surface of the sealing end cap 1. Through holes matching them are formed on the mounting seat 4. The support arm 5 is connected to the oil injection hydraulic cavity inside the sealing end cap 1 through the mounting seat 4.

[0059] As shown in Figure 1 、 Figure 3 and Figure 4 One side of the sealing end cap 1 is fixedly connected with an oil injection pipe 2. One end of the oil injection pipe 2 is connected to the output end of the hydraulic oil pump. Hydraulic oil can be injected into the inside of the sealing end cap 1 through the oil injection pipe 2 to provide sufficient driving force for the device. A control valve 3 is installed on the oil injection pipe 2. The control valve 3 can be a butterfly valve, a ball valve, a gate valve, a safety valve, etc., and is used to control the on-off of the hydraulic oil.

[0060] As shown in Figure 1 、 Figure 3 and Figure 4 When the control valve 3 is opened, hydraulic oil can be continuously injected into the inside of the sealing end cap 1 until there is sufficient pressure inside the sealing end cap 1. At this time, the control valve 3 is closed to keep the pressure inside the sealing end cap 1 unchanged, so as to seal the test pipeline more stably, prevent the internal pressure of the sealing end cap 1 from changing due to the reaction force of the liquid inside the test pipeline during the pressure test, and ensure the smooth progress of the pressure test.

[0061] As shown in Figure 4 A partition plate 12 is fixedly connected to the inside of the sealing end cap 1. An electromagnetic valve 13 is installed on the partition plate 12. The partition plate 12 divides the internal space of the sealing end cap 1 into two parts. One side of the partition plate 12 is the oil injection hydraulic cavity, and the other side of the partition plate 12 is the filling hydraulic cavity.

[0062] As shown in Figure 4 When the electromagnetic valve 13 is in the closed state, the hydraulic oil injected into the inside of the sealing end cap 1 through the oil injection pipe 2 only exists inside the oil injection hydraulic cavity. The hydraulic oil inside the oil injection hydraulic cavity will be transmitted to the hydraulic telescopic structure 6 through the support arm 5 to provide driving force for the hydraulic telescopic structure 6, so that the hydraulic telescopic structure 6 pushes the clamping block 7 to clamp the test pipeline. The clamping effect of the four clamping blocks 7 can pre-fix the sealing end cap 1 at the port of the pipeline to realize the installation of the sealing end cap 1.

[0063] Secondly, as shown in Figure 4 , after the installation of the sealing end cap 1 is completed, hydraulic oil continues to be injected into the interior of the sealing end cap 1. At this time, the solenoid valve 13 is opened, and the hydraulic oil inside the oil injection hydraulic cavity will flow into the interior of the filling hydraulic cavity until there is sufficient pressure inside the filling hydraulic cavity to撑开 the elastic pad 8, making the elastic pad 8 closely fit with the port of the pipeline to be measured, and there is sufficient pressure between the two. Even if the port of the pipeline to be measured is uneven or there are other connection structures, the elastic pad 8 will deform following the shape of the pipeline port, so as to fully fit with the pipeline port and ensure the sealing of pipelines with different-shaped ports.

[0064] As shown in Figure 1 , Figure 2 and Figure 3 , the hydraulic telescopic structure 6 is installed on the support arm 5. A clamping block 7 is installed on the hydraulic telescopic structure 6. One end of the clamping block 7 close to the pipeline to be measured is arc-shaped, which is convenient for better fitting with the outer wall of the pipeline to be measured, not easy to shake, enhancing the stability of clamping, and a protective pad is pasted and fixed on the inner wall of the arc-shaped notch. On the one hand, the protective pad can protect the outer wall of the pipeline to be measured, preventing the clamping block 7 from causing pressure damage to the outer wall of the pipeline and affecting the service life of the pipeline. On the other hand, it can greatly increase the friction between the clamping block 7 and the pipeline to be measured, making the clamping more stable. [[ID=

[14] ]

[0065] As shown in Figure 4 , Figure 5 and Figure 6 , the hydraulic telescopic structure 6 can push the clamping block 7 to be抱紧固定 with the outer wall of the pipeline to be measured. Here, the hydraulic telescopic structure 6 is an "L"-shaped elbow pipe, and a flange is installed on its top. The top end of the hydraulic telescopic structure 6 is fixedly connected to the support arm 5 through the flange.

[0066] Among them, as shown in Figure 4 and Figure 5 , the included angle between the bent part of the hydraulic telescopic structure 6 and the support arm 5 is 45 degrees. The support arm 5 always remains parallel to the pipeline to be measured. According to the principle that the alternate interior angles formed by two parallel lines intersected by a third line are equal, the included angle between the bent part of the hydraulic telescopic structure 6 and the pipeline to be measured is also 45 degrees.

[0067] Suppose, as shown in Figure 4 and Figure 5 , the clamping force of the hydraulic telescopic structure 6 pushing the clamping block 7 against the pipeline to be measured is F_push. Then F_push can be decomposed into a horizontal thrust F1 and a vertical thrust F2, and the magnitudes of F1 and F2 are the same. At this time, through the horizontal thrust F1, it can effectively prevent the clamping block 7 from sliding horizontally on the surface of the pipeline to be measured. Through the vertical thrust F2, it can ensure the clamping force of the clamping block 7 on the pipeline to be measured and prevent loosening, so as to achieve the stable installation of the sealing end cap 1.

[0068] As shown in Figure 4 and Figure 6 shown, the hydraulic telescopic structure 6 includes a fixed pipe 601 and a telescopic cylinder 602. The fixed pipe 601 is fixedly connected to the support arm 5 through a flange. The telescopic cylinder 602 is sleeved outside the fixed pipe 601, and the clamping block 7 is fixedly connected to the telescopic cylinder 602. One end of the telescopic cylinder 602 is closed, and the telescopic cylinder 602 is sleeved on one end of the bent part of the fixed pipe 601.

[0069] As shown in Figure 6 shown, after the hydraulic oil enters the fixed pipe 601, it will impact the telescopic cylinder 6, causing the telescopic cylinder 602 to extend and retract outward, thereby pushing the clamping block 7 to hold tightly outside the pipeline to be measured. At this time, the clamping force of the clamping block 7 can be controlled by adjusting the pressure of the hydraulic oil, which is convenient for adapting to pipelines to be measured with different materials.

[0070] As shown in Figure 6 and Figure 7 shown, a limiting block 603 is fixedly connected to one end of the fixed pipe 601, a limiting groove 604 is provided on the inner wall of the telescopic cylinder 602, the limiting block 603 is slidably connected inside the limiting groove 604, and a sealing component 605 is fixedly connected to the outside of the limiting block 603. The sealing component 605 uses a rubber ring to ensure the sealing performance of the hydraulic oil.

[0071] Among them, as shown in Figure 6 and Figure 7 shown, the diameter of the limiting block 603 is larger than that of the fixed pipe 601. The sliding of the limiting block 603 inside the limiting groove 604 will limit the telescopic movement of the telescopic cylinder 602. When the telescopic cylinder 602 is telescoped to the maximum extent, the limiting block 603 will prevent it from continuing to slide and telescoping, preventing the telescopic cylinder 602 from slipping off the fixed pipe 601.

[0072] As shown in Figure 4 and [[ID=3l]] Figure 5 shown, a diversion cavity 11 is provided inside the support arm 5, and the fixed pipe 601 is connected to the inside of the sealing end cap 1 through the diversion cavity 11 inside the support arm 5. A passage is formed among the fixed pipe 601, the diversion cavity 11 and the oil injection hydraulic cavity, and hydraulic driving force can be provided through this passage.

[0073] As shown in Figure 4 and Figure 5 shown, the hydraulic oil inside the oil injection hydraulic cavity can flow to the four groups of fixed pipes 601 simultaneously through the diversion cavity 11 inside the support arm 5. After the hydraulic oil enters the telescopic cylinder 602 through the fixed pipe 601, with the continuous injection of the hydraulic oil, under the pressure of the hydraulic oil, it will push the telescopic cylinder 602 to extend and retract outward, causing the telescopic cylinder 602 to gradually push the clamping block 7 to hold tightly against the pipeline to be measured.

[0074] In this embodiment, the hydraulic telescopic structure 6 composed of a fixed pipe 601, a telescopic cylinder 602, a limiting block 603, a limiting groove 604 and a sealing component 605, and the installation support structure for the sealing end cap 1 composed of a clamping block 7 can be replaced by a tension support structure composed of a flange, a tie rod and a nut. Here, a set of flanges is welded at a position near the port of the pipeline to be measured, and a component is welded outside the sealing end cap 1. A tie rod passes through the assembly holes between the two flanges. The tie rod is a threaded tie rod, and a matching nut is screwed onto the tie rod.

[0075] During the installation of the sealing end cap 1, align the flange outside it with the flange outside the pipeline to be measured, then pass the tie rod through the assembly holes between the two flanges, and screw the nut into one end of the tie rod. Control the distance between the two flanges through the nut, so that the sealing end cap 1 and the port of the pipeline to be measured maintain an appropriate distance, and the pre-installation support of the sealing end cap can be completed, which has the same function as that achieved by the hydraulic telescopic structure 6 and the clamping block 7.

[0076] In addition, the installation support structure for the sealing end cap 1 composed of the hydraulic telescopic structure 6 composed of a fixed pipe 601, a telescopic cylinder 602, a limiting block 603, a limiting groove 604 and a sealing component 605, and the clamping block 7 can also be replaced by any welding fixation for the sealing end cap 1. For example, four groups of steel bars are welded on the sealing end cap 1, and the angles of the four groups of steel bars can be adjusted arbitrarily.

[0077] When installing the sealing end cap 1 through the four groups of steel bars, just make the sealing end cap face the port of the pipeline to be measured and maintain an appropriate distance, then weld the other ends of the four groups of steel bars on the outer wall of the pipeline to be measured respectively. The sealing end cap 1 can also be well pre-installed and supported through the four groups of steel bars, which also has the same function as that achieved by the hydraulic telescopic structure 6 and the clamping block 7.

[0078] See Figure 1 、 Figure 2 and Figure 3 As shown, a solvent box 9 is fixedly connected to the support arm 5. A sealant dissolvent is stored inside the solvent box 9, and an electric spray head 10 is installed on the solvent box 9. A micro water pump is installed on each electric spray head 10 to provide a power source for the electric spray head 10 to spray the sealant dissolvent.

[0079] Here, the solvent cartridge 9 and the electric nozzle 10 are used in conjunction with manual application of sealant (not shown in the figure). After the elastic pad 8 is tightly fitted to the port of the pipe under test to form a seal, for safety, a layer of epoxy resin sealant can be manually applied along the seam between the elastic pad 8 and the port of the pipe under test to ensure the seal and add an extra layer of assurance for the success of the pressure test. After the test is completed, the electric nozzle 10 sprays out the sealant solvent stored in the solvent cartridge 9, causing the applied sealant to dissolve on its own, thus eliminating the need for manual removal, saving time and effort, and facilitating the reuse of the device.

[0080] Working principle:

[0081] In use, the sealing cap 1 is first placed at the port of the pipe to be tested. Then, one end of the oil injection pipe 2 is connected to the output end of the hydraulic oil pump, and the control valve 3 is opened. At this time, the solenoid valve 13 is in the closed state. Then, hydraulic oil is continuously injected into the sealing cap 1 through the oil injection pipe 2. The hydraulic oil exists only inside the oil injection hydraulic cavity. The hydraulic oil inside the oil injection hydraulic cavity can flow to the four sets of fixed pipes 601 through the guide cavity 11 inside the support arm 5. After the hydraulic oil enters the telescopic cylinder 602 through the fixed pipe 601, with the continuous injection of hydraulic oil, the telescopic cylinder 602 will be pushed to extend and retract outward under the pressure of the hydraulic oil. The telescopic cylinder 602 will gradually push the clamping block 7 to clamp the pipe to be tested. After the four sets of clamping blocks 7 clamp the outside of the pipe to be tested at the same time, the sealing cap 1 is fixed at the end of the pipe to be tested, and the installation of the sealing cap 1 is completed.

[0082] Next, hydraulic oil is continuously injected into the interior of the sealing cap 1. At this time, the solenoid valve 13 is opened, and the hydraulic oil inside the injection hydraulic cavity flows into the filling hydraulic cavity until there is enough pressure inside the filling hydraulic cavity to expand the elastic pad 8, so that the elastic pad 8 gradually fits tightly against the port of the pipe to be tested, until there is enough pressure between the two. Even if the port of the pipe to be tested is not flat or there are other connecting structures, the elastic pad 8 will deform according to the shape of the pipe port, thus fully fitting against the pipe port, ensuring that it can seal the pipe with different shaped ports.

[0083] Finally, if the diameter of the pipe to be pressure tested is large, the pressure of the internal liquid is also relatively high. To be on the safe side, sealant can be manually applied along the joint between the elastic pad 8 and the pipe port. The sealant forms a secondary seal on the outside to prevent liquid leakage and ensure the smooth progress of the pressure test. Before the device is removed, the sealant solvent stored in the solvent box 9 can be sprayed out by the electric nozzle 10 to dissolve and remove the sealant without affecting the reuse of the device.

[0084] This invention can automatically install and fix the sealing component to the end of the pipe under hydraulic drive, and can seal the pipe end of any shape by hydraulic means, thereby realizing the sealing and pressure testing of the pipe under test that can adapt to any shape of end. It has strong applicability and solves the existing practical problems very well.

[0085] In the description of this invention, it should be understood that 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0086] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0087] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0088] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0089] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A sealing device for sealing a water supply pipe to be tested for pressure testing of an underground water supply pipe, characterized in that, The utility model provides a sealing end cap for underground water supply pipeline, which comprises a sealing end cap (1), the inside of the sealing end cap (1) is fixedly connected with a partition (12), the partition (12) divides the inside space of the sealing end cap (1) into two parts, one side of the partition (12) is an oil injection cavity, the other side of the partition (12) is a filling cavity capable of expanding or shrinking, the outer wall of the filling cavity is in contact with the pipeline port of the underground water supply pipeline and seals the pipeline port; The sealing end cap (1) is further provided with at least two support arms (5), each support arm (5) is connected with a clamping block (7) through a telescopic structure, the telescopic structure extends towards the sealing end cap (1), the telescopic structure has an inclined angle with the axis of the underground water supply pipeline, and the clamping block (7) can be in contact with the outer wall of the underground water supply pipeline to clamp the underground water supply pipeline between the support arms (5). The sealing end cap (1) comprises a hard cap body and an elastic pad, the oil injection cavity is arranged in the hard cap body, the oil injection cavity is in fluid communication with the telescopic structure, the side of the hard cap body facing the pipeline port is provided with a groove, the elastic pad (8) is connected to one end of the groove facing the pipeline port and encloses the filling cavity together, and the injection of air or hydraulic oil into the filling cavity can make the elastic pad (8) expand towards the pipeline port.

2. The sealing device for pressure testing of underground water supply pipes according to claim 1, characterized in that, The material of the elastic pad (8) is selected from one of fluoro rubber, nitrile rubber and silicone rubber.

3. The sealing device for pressure testing of underground water supply pipes according to claim 1, characterized in that, The telescopic structure is a hydraulic telescopic structure (6), the support arm (5) is provided with a flow guide cavity (11), and the hydraulic telescopic structure (6) is in communication with the oil injection cavity through the flow guide cavity (11).

4. The sealing device for pressure testing of underground water supply pipes according to claim 1, characterized in that, The sealing end cap (1) is provided with an oil injection pipe (2), the oil injection pipe (2) is in communication with the oil injection cavity, and the oil injection pipe (2) is provided with a control valve (3).

5. The sealing device for pressure testing of underground water supply pipes according to claim 1, characterized in that, The bottom wall of the groove is provided with a channel, the channel can communicate the oil injection cavity and the filling cavity, and the channel is provided with an electromagnetic valve (13).

6. The sealing device for pressure testing of underground water supply pipes according to claim 1, characterized in that, The clamping block (7) is provided with an arc-shaped groove on the side close to the outer wall of the underground water supply pipeline.

7. The sealing device for pressure testing of underground water supply pipes according to claim 1, characterized in that, The support arm (5) is provided with a solvent box (9), and the solvent box (9) is provided with a solvent for dissolving sealant.

8. The sealing device for pressure testing of underground water supply pipes according to claim 1, characterized in that, The sealing end cap (1) is disc-shaped, and the diameter of the sealing end cap (1) is greater than or equal to the diameter of the underground water supply pipeline.

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