Pigging pressure testing device for pipeline and construction method

Abstract

The invention discloses a pigging pressure testing device of a pipeline and a construction method, and relates to the technical field of pipeline construction.The pigging pressure testing device of the pipeline comprises a ball serving pipeline, a ball collecting pipeline, a water injection structure and a pigging ball, the ball serving pipeline is used for being installed at one end of the pipeline, and a water inlet is formed in the ball serving pipeline; the ball receiving pipeline is used for being installed at the other end of the pipeline, an exhaust port is formed in the ball receiving pipeline, the water injection structure comprises a water tank, a pressurizing part and a water injection pipe, the water injection pipe is communicated with the water tank and the water inlet, and the pressurizing part is arranged on the water injection pipe and used for pressurizing injection water injected into the ball serving pipeline; the spherical pig is arranged on the ball serving pipeline and used for being tightly matched with the inner wall face of a pipeline so that the spherical pig can move from the ball serving pipeline to the ball receiving pipeline along the pipeline in the injection water feeding process. According to the scheme, pipe cleaning and pressure testing can be conducted at the same time, and the problems of low construction efficiency and high cost are solved.

Description

Technical Field

[0001] This invention relates to the field of pipeline construction technology, and in particular to a pipeline cleaning and pressure testing device and construction method. Background Technology

[0002] In long-distance pipeline construction, venting and pressure testing are crucial steps to ensure pipeline sealing and cleanliness. Traditionally, pressure testing and cleaning are performed by different construction units. The pipeline installation unit first conducts the pressure test to ensure sealing, and then the pipeline cleaning unit cleans the pipeline. This process is time-consuming and inefficient, resulting in high costs. Summary of the Invention

[0003] The main objective of this invention is to propose a pipeline cleaning and pressure testing device and construction method, which aims to solve the problems of low efficiency and high cost of existing pipeline cleaning and pressure testing construction.

[0004] To achieve the above objectives, the present invention proposes a pipeline cleaning and pressure testing device, comprising:

[0005] A serving pipe, used to be installed at one end of a pipeline, wherein the serving pipe is provided with a water inlet;

[0006] A ball-receiving pipe is used to be installed at the other end of a pipeline, and the ball-receiving pipe is provided with an exhaust port.

[0007] The water injection structure includes a water tank, a pressurizing unit, and a water injection pipe. The water injection pipe connects the water tank and the water inlet. The pressurizing unit is located on the water injection pipe and is used to pressurize the water injected into the launching pipe.

[0008] A pigging ball is installed in the launching pipe. The pigging ball is designed to fit tightly against the inner wall of the pipeline so that it can move from the launching pipe to the receiving pipe during the water injection process.

[0009] In one embodiment, the pipeline cleaning and pressure testing device further includes a flow sensor for detecting the flow rate of water injected into the pipeline;

[0010] The pigging ball includes a main body, a variable diameter section, and a drive section. The variable diameter section is wrapped around the outside of the main body and can deform in the radial direction to fit tightly with the inner wall of the pipeline. The drive section is located inside the main body and is electrically connected to the flow sensor and drivenly connected to the variable diameter section to control the deformation of the variable diameter section according to the flow rate detected by the flow sensor.

[0011] In one embodiment, the inner wall surface of the variable diameter section is provided with a liquid injection port, and the outer wall surface is flexibly configured;

[0012] The drive unit includes a liquid injector, which is provided corresponding to the liquid injection port, for injecting or drawing out liquid into the variable diameter section to deform the variable diameter section.

[0013] In one embodiment, the inner wall surface of the variable diameter section is provided with a plurality of liquid injection ports;

[0014] The injector is provided with multiple injection ports corresponding to multiple injection ports.

[0015] In one embodiment, the pipeline cleaning and pressure testing device further includes a pressure sensor for detecting the pressure of the water injected into the pipeline.

[0016] In one embodiment, a solenoid valve is provided on the exhaust port to control the opening and closing of the exhaust port.

[0017] This invention also proposes a pipeline cleaning and pressure testing method, based on the aforementioned pipeline cleaning and pressure testing device, which includes:

[0018] A serving pipe, used to be installed at one end of a pipeline, wherein the serving pipe is provided with a water inlet;

[0019] A ball-receiving pipe is used to be installed at the other end of a pipeline, and the ball-receiving pipe is provided with an exhaust port.

[0020] The water injection structure includes a water tank, a pressurizing unit, and a water injection pipe. The water injection pipe connects the water tank and the water inlet. The pressurizing unit is located on the water injection pipe and is used to pressurize the water injected into the launching pipe.

[0021] A pigging ball is installed in the launching pipe. The pigging ball is used to fit tightly with the inner wall of the pipeline so that it can move from the launching pipe to the receiving pipe during the process of water injection.

[0022] The pipeline cleaning and pressure testing method includes the following steps:

[0023] The ball-serving conduit and the ball-receiving conduit are respectively installed at both ends of the pipeline, and the cleaning ball is installed in the ball-serving conduit;

[0024] Water is injected into the launching pipeline through the pressurization section to propel the pigging pig within the pipeline.

[0025] Once the pigging ball reaches the receiving pipeline, the water pressure is increased through the pressurization section to conduct a pressure test on the pipeline.

[0026] In one embodiment, the pipeline cleaning and pressure testing device further includes a flow sensor for detecting the flow rate of water injected into the pipeline;

[0027] The pigging ball includes a main body, a variable diameter section, and a drive section. The variable diameter section is wrapped around the outside of the main body and can deform in the radial direction to fit tightly with the inner wall of the pipeline. The drive section is located inside the main body and is electrically connected to the flow sensor and drivenly connected to the variable diameter section to control the deformation of the variable diameter section according to the flow rate detected by the flow sensor.

[0028] The step of injecting water into the launching pipeline through the pressurization section to propel the pigging pig within the pipeline further includes:

[0029] Real-time acquisition of the flow rate of water injected into the pipeline;

[0030] If the flow rate of water injected into the pipeline decreases, the drive unit is controlled to drive the variable diameter part to deform inward.

[0031] If the flow rate of water injected into the pipeline increases, the drive unit is controlled to drive the variable diameter section to change shape.

[0032] In one embodiment, the inner wall surface of the variable diameter section is provided with a liquid injection port;

[0033] The drive unit includes a liquid injector, which is provided corresponding to the liquid injection port, for injecting or drawing out liquid into the variable diameter part so as to deform the variable diameter part;

[0034] The step of controlling the drive unit to drive the variable diameter part to deform inward if the flow rate of water injected into the pipeline decreases specifically includes:

[0035] If the flow rate of water injected into the pipeline decreases, the injector is controlled to draw out the liquid;

[0036] The step of controlling the drive unit to drive the variable diameter part to change shape if the flow rate of water injected into the pipeline increases specifically includes:

[0037] If the flow rate of water injected into the pipeline increases, control the injector to inject liquid.

[0038] In one embodiment, the pipeline cleaning and pressure testing device further includes a pressure sensor for detecting the pressure of the water injected into the pipeline;

[0039] If the flow rate of water injected into the pipeline decreases, the step of controlling the injector to draw out liquid further includes:

[0040] The pressure of the water injected into the pipeline is obtained. If the pressure of the water injected into the pipeline is greater than the preset value, the injector continues to draw out liquid until the pressure of the water injected into the pipeline is within the preset range.

[0041] If the flow rate of water injected into the pipeline increases, the step of controlling the injection of liquid by the injector further includes:

[0042] The pressure of the water injected into the pipeline is obtained. If the pressure of the water injected into the pipeline is less than the preset value, the injector is controlled to continue injecting liquid until the pressure of the water injected into the pipeline is within the preset range.

[0043] The technical solution of this invention achieves pipeline cleaning by setting up a cleaning ball that can move inside the pipeline. By using a water injection structure, water is injected into the pipeline to move the cleaning ball, thereby venting gas from the pipeline during cleaning and preparing for pressure testing. Specifically, the water injection structure includes a water tank, a pressurizing section, and a water injection pipe. When the cleaning ball moves to the receiving pipe, the pressurizing section is pressurized to perform a pressure test on the pipeline. By setting up launching and receiving pipes at both ends of the pipeline, the cleaning ball can be installed and received, facilitating the installation of other equipment and improving the assemblability of the device. This solution combines the cleaning and venting process with water injection and pressure testing, achieving efficient cleaning and pressure testing with only one water injection, improving construction quality and economy. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0045] Figure 1 A schematic diagram of an embodiment of the pipeline cleaning and pressure testing device provided by the present invention;

[0046] Figure 2 for Figure 1 Schematic diagram of the structure of the central cleaning tube;

[0047] Figure 3 A schematic flowchart of the first embodiment of the pipeline cleaning and pressure testing construction method provided by the present invention;

[0048] Figure 4 A schematic flowchart of the second embodiment of the pipeline cleaning and pressure testing construction method provided by the present invention;

[0049] Figure 5 A schematic flowchart of the third embodiment of the pipeline cleaning and pressure testing construction method provided by the present invention;

[0050] Figure 6 This is a flowchart illustrating the fourth embodiment of the pipeline cleaning and pressure testing construction method provided by the present invention.

[0051] Explanation of icon numbers:

[0052] 100. Pipeline cleaning and pressure testing device; 1. Launching pipe; 11. Inlet; 2. Receiving pipe; 21. Vent; 22. Solenoid valve; 3. Water injection structure; 31. Water tank; 32. Pressurizing section; 33. Injection pipe; 4. Cleaning ball; 41. Main body; 42. Variable diameter section; 421. Injection port; 43. Drive unit; 431. Injector; 5. Flow sensor; 6. Pressure sensor;

[0053] 200. Pipelines.

[0054] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0056] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0057] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0058] In long-distance pipeline construction, venting and pressure testing are crucial steps to ensure pipeline sealing and cleanliness. Traditionally, pressure testing and cleaning are performed by different construction units. The pipeline installation unit first conducts the pressure test to ensure sealing, and then the pipeline cleaning unit cleans the pipeline. This process is time-consuming and inefficient, resulting in high costs.

[0059] The main objective of this invention is to propose a pipeline cleaning and pressure testing device and construction method, which aims to solve the problems of low efficiency and high cost in existing pipeline cleaning and pressure testing construction.

[0060] To achieve the above objectives, please refer to Figure 1 This invention proposes a pipeline cleaning and pressure testing device 100, comprising a launching pipe 1, a receiving pipe 2, a water injection structure 3, and a cleaning ball 4. The launching pipe 1 is installed at one end of the pipeline 200 and has a water inlet 11. The receiving pipe 2 is installed at the other end of the pipeline 200 and has an exhaust port 21. The water injection structure 3 includes a water tank 31, a pressurizing part 32, and a water injection pipe 33. The water injection pipe 33 connects the water tank 31 and the water inlet 11. The pressurizing part 32 is located on the water injection pipe 33 and is used to pressurize the injected water injected into the launching pipe 1. The cleaning ball 4 is located on the launching pipe 1 and is used to fit tightly with the inner wall of the pipeline 200 so that it moves from the launching pipe 1 along the pipeline 200 to the receiving pipe 2 during the process of injecting water.

[0061] The technical solution of this invention achieves cleaning of the pipeline 200 by setting up a cleaning ball 4 that can move inside the pipeline 200. By setting up the water injection structure 3, water is injected into the pipeline 200 to move the cleaning ball 4, thereby venting gas from the pipeline 200 during cleaning and preparing for pressure testing. Specifically, the water injection structure 3 includes a water tank 31, a pressurizing part 32, and a water injection pipe 33. When the cleaning ball 4 moves to the ball receiving pipe 2, the pressurizing part 32 is pressurized to achieve pressure testing of the pipeline 200. By setting the launching pipe 1 and the receiving pipe 2 at both ends of the pipeline 200, the cleaning ball 4 can be installed and received, facilitating the installation of other equipment and improving the assemblability of the device. This solution combines the ball-passing and venting process with the water injection and pressure testing process, achieving efficient cleaning and pressure testing with only one water injection, improving construction quality and economy.

[0062] It is worth mentioning that this solution does not impose specific restrictions on the implementation of the pressurizing unit 32. It can be set as a water pump plus a regulating valve to control the pressure of the injected water, or it can be set as a variable frequency pump to adjust the output pressure of the water pump by adjusting the speed of the water pump motor.

[0063] It is understood that the outer wall surface of the pigging ball 4 has a certain elasticity and slightly abuts against the inner wall surface of the pipeline 200, thereby achieving a tight fit between the pigging ball 4 and the pipeline 200.

[0064] It is also understood that the vent 21 is used to discharge the gas inside the pipeline 200 when the pigging ball 4 is moving, and at the same time, it can also discharge the injected water that seeps out from between the pigging ball 4 and the inner wall of the pipeline 200.

[0065] It is worth mentioning that the ball receiving pipe 2 and the ball launching pipe 1 have end caps for the installation or removal of the cleaning ball 4, and to ensure the airtightness of the pipes.

[0066] In order to ensure that the pigging ball 4 can also cooperate well with the pipeline 200 in the reducing pipeline 200, in one embodiment provided by the present invention, please refer to... Figure 2 The pipeline cleaning and pressure testing device 100 also includes a flow sensor 5 for detecting the flow rate of water injected into the pipeline 200; the cleaning ball 4 includes a main body 41, a variable diameter part 42, and a driving part 43. The variable diameter part 42 is wrapped around the outside of the main body 41 and can deform in the radial direction for tight fit with the inner wall of the pipeline 200. The driving part 43 is located inside the main body 41. The driving part 43 is electrically connected to the flow sensor 5 and drivenly connected to the variable diameter part 42 to control the deformation of the variable diameter part 42 according to the flow rate detected by the flow sensor 5. With this configuration, when the pigging ball 4 moves from the large-diameter pipeline 200 to the small-diameter pipeline 200, the resistance force on the pigging ball 4 increases due to the smaller pipe diameter, causing the flow rate of water injected into the pipeline 200 to decrease, or even become zero. At this time, the flow sensor 5 detects the abnormality and feeds back to the drive unit 43. The drive unit 43 drives the diameter-changing part 42 to deform inward so that the outer diameter of the pigging ball 4 matches the pipe diameter, thereby preventing the occurrence of phenomena such as ball jamming and blockage. When the pigging ball 4 moves from the small-diameter pipeline 200 to the large-diameter pipeline 200, the resistance force on the pigging ball 4 decreases due to the larger pipe diameter, causing the flow rate of water injected into the pipeline 200 to increase. At this time, the flow sensor 5 detects the abnormality and feeds back to the drive unit 43. The drive unit 43 drives the diameter-changing part 42 to deform outward so that the outer diameter of the pigging ball 4 matches the pipe diameter, thereby preventing the phenomenon that the pigging ball 4 cannot clean the large-diameter part.

[0067] It is worth mentioning that the flow sensor 5 can also help calculate the location of the diameter change point of pipeline 200. By obtaining the diameter of pipeline 200, the flow rate of injected water and the injection time of injected water, the estimated location when the flow is abnormal can be calculated. By recording the estimated location, a reference can be provided for the timing of diameter change of the diameter change section 42 during the next pipeline cleaning and pressure test.

[0068] Specifically, the inner wall of the variable diameter section 42 is provided with a liquid injection port 421, while the outer wall is flexibly designed. The driving part 43 includes a liquid injector 431, corresponding to the liquid injection port 421, for injecting or drawing liquid into the variable diameter section 42 to deform it. It is worth noting that the liquid inside the variable diameter section 42 is an incompressible liquid. This design achieves the diameter change of the variable diameter section 42 by increasing or decreasing the amount of liquid, resulting in a simple structure while providing more stable and rigid support. The sealing pressure is less prone to fluctuation, and in the event of leakage, the liquid is released slowly compared to high-pressure gas, reducing the risk.

[0069] Furthermore, the inner wall surface of the variable diameter section 42 is provided with multiple injection ports 421; the injector 431 is provided with multiple injection ports 421 corresponding to the multiple injection ports 421. This arrangement can improve the efficiency of liquid injection or extraction, and by reasonably controlling the number of injectors 431 in operation, different liquid transfer speed gradients can be formed to cope with different working conditions.

[0070] To facilitate the pressure testing process, the pipeline pigging and pressure testing device 100 also includes a pressure sensor 6 for detecting the pressure of the water injected into the pipeline 200. This configuration allows the pressure sensor 6 to monitor the water pressure within the pipeline 200 in real time, facilitating the recording of test data during the pressure testing process. Notably, the pressure value can also help determine the location of diameter changes. A higher pressure value indicates increased resistance to the pigging ball 4, resulting in a smaller pipe diameter; conversely, a lower pressure value indicates decreased resistance to the pigging ball 4, resulting in a larger pipe diameter. In practice, changes in both pressure and flow rate can be considered to determine the diameter changes in the pipeline 200.

[0071] Furthermore, a solenoid valve 22 is provided on the exhaust port 21 to control the opening and closing of the exhaust port 21. This configuration allows the solenoid valve 22 to open the exhaust port 21 before the pigging ball 4 moves to the receiving pipe 2, and to close the exhaust port 21 after the pigging ball 4 moves to the receiving pipe 2, thus improving the automation level of the device.

[0072] This invention also proposes a pipeline cleaning and pressure testing method, based on the aforementioned pipeline cleaning and pressure testing device 100. Please refer to [reference needed]. Figure 3 In the first embodiment of the present invention, the pipeline cleaning and pressure testing method includes the following steps:

[0073] S100: Install the ball-serving pipe 1 and the ball-receiving pipe 2 at both ends of the pipeline 200, and install the cleaning ball 4 on the ball-serving pipe 1.

[0074] S200: Inject water into the launching pipeline 1 through the pressurization unit 32 to push the pigging ball 4 to move within the pipeline 200.

[0075] S300: When the pigging ball 4 moves to the receiving pipe 2, the water pressure is increased by the pressurizing part 32 to conduct a pressure test on the pipeline 200.

[0076] The technical solution provided by this invention involves installing a launching pipe 1 and a receiving pipe 2 before water injection to prepare for the cleaning process of the cleaning pig 4. The water injection pressure pushes the cleaning pig 4 to expel air and any debris from the pipe, achieving the purpose of cleaning and rapid water injection, thus preparing for the pressure testing process. After the pipe is filled with water, since most of the internal air has been expelled, the pressurization process saves a significant amount of time, greatly improving construction efficiency.

[0077] In practical implementation, for example, this method was used to complete pigging and pressure testing in the Wanhua Yantai Industrial Park external pipe rack project. Located in the Yantai Chemical Industrial Park, this project connects multiple companies within the park via a pipe corridor, crossing several municipal roads. Each pipeline is 3.8 kilometers long, with varying elevations and winding paths. Traditional construction processes require the pipeline installation unit to complete the pressure test to ensure tightness before handing it over to the cleaning unit for pigging, cleaning, and drying. This results in a long construction period, especially during water injection and pressure testing. Due to the long pipeline route, significant elevation differences, and lack of drainage and venting along the route, it is difficult to completely remove air from the pipeline, leading to prolonged water injection time and difficulties in subsequent pressure increases, consuming a significant amount of time throughout the entire pressure testing cycle. Using this method, before water injection, a pigging ball 4 is installed in the launching pipeline 1. The water injection pressure pushes the pigging ball 4 to expel air and any remaining debris from the pipeline, achieving rapid water injection. After the pipeline is filled with water, most of the internal air has been expelled, saving considerable time in the pressure increase process.

[0078] In the second embodiment proposed in this invention, please refer to Figure 4 The pipeline cleaning and pressure testing device 100 further includes a flow sensor 5 for detecting the flow rate of water injected into the pipeline 200; the cleaning ball 4 includes a main body 41, a variable diameter part 42, and a driving part 43. The variable diameter part 42 is wrapped around the outside of the main body 41 and can deform in the radial direction to fit tightly with the inner wall of the pipeline 200. The driving part 43 is located inside the main body 41. The driving part 43 is electrically connected to the flow sensor 5 and drivenly connected to the variable diameter part 42 to control the deformation of the variable diameter part 42 according to the flow rate detected by the flow sensor 5; after the step of injecting water into the launching pipe 1 through the pressurizing part 32 to push the cleaning ball 4 to move in the pipeline 200, the device further includes:

[0079] S201: Real-time acquisition of the flow rate of water injected into the pipeline within 200.

[0080] S202: If the flow rate of water injected into pipeline 200 decreases, control the drive unit 43 to drive the variable diameter unit 42 to deform inward.

[0081] S203: If the flow rate of water injected into pipeline 200 increases, control the drive unit 43 to drive the variable diameter unit 42 to change its shape.

[0082] It should be noted that the drive unit 43 not only has a drive structure that can drive the deformation of the variable diameter unit 42, but also has a control device that receives the signal from the flow sensor 5 and can control the drive structure. The control device can select to execute step S202 or S203 according to the change in flow rate.

[0083] Furthermore, in the third embodiment proposed in this invention, please refer to... Figure 5 The inner wall surface of the variable diameter section 42 is provided with a liquid injection port 421; the driving section 43 includes a liquid injector 431, which is provided corresponding to the liquid injection port 421, for injecting or drawing liquid into the variable diameter section 42 to deform the variable diameter section 42; the step of controlling the driving section 43 to drive the variable diameter section 42 to deform inward if the flow rate of water injected into the pipeline 200 decreases specifically includes:

[0084] S204: If the flow rate of water injected into pipeline 200 decreases, control the injector 431 to draw out the liquid;

[0085] The step of controlling the drive unit 43 to drive the variable diameter unit 42 to change shape in the direction of the water injected into the pipeline 200 when the flow rate of the water increases specifically includes:

[0086] S205: If the flow rate of water injected into pipeline 200 increases, control the injector 431 to inject liquid.

[0087] It should be noted that the drive unit 43 not only has the ability to drive the variable diameter part 42 to deform the injector 431, but also has a control device that receives the signal from the flow sensor 5 and can control the injector 431. The control device can select to execute step S204 or S205 according to the change in flow rate.

[0088] Furthermore, in the fourth embodiment proposed in this invention, please refer to... Figure 6 The pipeline cleaning and pressure testing device 100 further includes a pressure sensor 6 for detecting the pressure of the water injected into the pipeline 200; after the step of controlling the injector 431 to draw out liquid if the flow rate of the water injected into the pipeline 200 decreases, the device further includes:

[0089] S206: Obtain the pressure of the water injected into the pipeline 200. If the pressure of the water injected into the pipeline 200 is greater than the preset value, continue to control the injector 431 to draw out liquid until the pressure of the water injected into the pipeline 200 is within the preset range.

[0090] If the flow rate of water injected into pipeline 200 increases, the step of controlling the injector 431 to inject liquid further includes:

[0091] S207: Obtain the pressure of the water injected into the pipeline 200. If the pressure of the water injected into the pipeline 200 is less than the preset value, continue to control the injector 431 to inject liquid until the pressure of the water injected into the pipeline 200 is within the preset range.

[0092] It is understandable that the preset value is the initial water pressure given by the pressurizing unit 32 to the injected water in the pipeline, that is, the stable water pressure after the pigging ball 4 has been moving in the pipeline for a period of time. The preset range refers to the pressure range near the preset value. For example, if the preset value is set to 0.4MPa, the preset range can be set between 0.42MPa and 0.38MPa.

[0093] It should be noted that during the process of injecting or drawing out liquid in the injector 431, a step-by-step injection scheme can be adopted. For example, when liquid needs to be injected, one volume unit of liquid can be pushed first, and then step S207 can be repeated. If the pressure value does not meet the preset range, another volume unit of liquid can be pushed in, and so on, to avoid injecting too much liquid at once, which would cause the outer diameter of the pigging ball 4 to be too large.

[0094] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A pipeline cleaning and pressure testing device, characterized in that, include: A serving pipe, used to be installed at one end of a pipeline, wherein the serving pipe is provided with a water inlet; A ball-receiving pipe is used to be installed at the other end of a pipeline, and the ball-receiving pipe is provided with an exhaust port. The water injection structure includes a water tank, a pressurizing unit, and a water injection pipe. The water injection pipe connects the water tank and the water inlet. The pressurizing unit is located on the water injection pipe and is used to pressurize the water injected into the launching pipe. A pigging ball is installed in the launching pipe. The pigging ball is designed to fit tightly against the inner wall of the pipeline so that it can move from the launching pipe to the receiving pipe during the water injection process.

2. The pipeline cleaning and pressure testing device as described in claim 1, characterized in that, The pipeline cleaning and pressure testing device also includes a flow sensor for detecting the flow rate of water injected into the pipeline; The pigging ball includes a main body, a variable diameter section, and a drive section. The variable diameter section is wrapped around the outside of the main body and can deform in the radial direction to fit tightly with the inner wall of the pipeline. The drive section is located inside the main body and is electrically connected to the flow sensor and drivenly connected to the variable diameter section to control the deformation of the variable diameter section according to the flow rate detected by the flow sensor.

3. The pipeline cleaning and pressure testing device as described in claim 2, characterized in that, The inner wall of the variable diameter section is provided with a liquid injection port, and the outer wall is flexible. The drive unit includes a liquid injector, which is provided corresponding to the liquid injection port, for injecting or drawing out liquid into the variable diameter section to deform the variable diameter section.

4. The pipeline cleaning and pressure testing device as described in claim 3, characterized in that, The inner wall surface of the variable diameter section is provided with multiple liquid injection ports; The injector is provided with multiple injection ports corresponding to multiple injection ports.

5. The pipeline cleaning and pressure testing device as described in claim 2, characterized in that, The pipeline cleaning and pressure testing device also includes a pressure sensor for detecting the pressure of the water injected into the pipeline.

6. The pipeline cleaning and pressure testing device as described in claim 1, characterized in that, A solenoid valve is installed on the exhaust port to control the opening and closing of the exhaust port.

7. A pipeline cleaning and pressure testing method, based on the pipeline cleaning and pressure testing device according to any one of claims 1 to 6, characterized in that, The pipeline cleaning and pressure testing method includes the following steps: The ball-serving conduit and the ball-receiving conduit are respectively installed at both ends of the pipeline, and the cleaning ball is installed in the ball-serving conduit; Water is injected into the launching pipeline through the pressurization section to propel the pigging pig within the pipeline. Once the pigging ball reaches the receiving pipeline, the water pressure is increased through the pressurization section to conduct a pressure test on the pipeline.

8. The pipeline cleaning and pressure testing method as described in claim 7, characterized in that, The pipeline cleaning and pressure testing device also includes a flow sensor for detecting the flow rate of water injected into the pipeline; The pigging ball includes a main body, a variable diameter section, and a drive section. The variable diameter section is wrapped around the outside of the main body and can deform in the radial direction to fit tightly with the inner wall of the pipeline. The drive section is located inside the main body and is electrically connected to the flow sensor and drivenly connected to the variable diameter section to control the deformation of the variable diameter section according to the flow rate detected by the flow sensor. The step of injecting water into the launching pipeline through the pressurization section to propel the pigging pig within the pipeline further includes: Real-time acquisition of the flow rate of water injected into the pipeline; If the flow rate of water injected into the pipeline decreases, the drive unit is controlled to drive the variable diameter part to deform inward. If the flow rate of water injected into the pipeline increases, the drive unit is controlled to drive the variable diameter section to change shape.

9. The pipeline cleaning and pressure testing method as described in claim 8, characterized in that, The inner wall surface of the variable diameter section is provided with a liquid injection port; The drive unit includes a liquid injector, which is provided corresponding to the liquid injection port, for injecting or drawing out liquid into the variable diameter part so as to deform the variable diameter part; The step of controlling the drive unit to drive the variable diameter part to deform inward if the flow rate of water injected into the pipeline decreases specifically includes: If the flow rate of water injected into the pipeline decreases, the injector is controlled to draw out the liquid; The step of controlling the drive unit to drive the variable diameter part to change shape if the flow rate of water injected into the pipeline increases specifically includes: If the flow rate of water injected into the pipeline increases, control the injector to inject liquid.

10. The pipeline cleaning and pressure testing method as described in claim 9, characterized in that, The pipeline cleaning and pressure testing device also includes a pressure sensor for detecting the pressure of the water injected into the pipeline; If the flow rate of water injected into the pipeline decreases, the step of controlling the injector to draw out liquid further includes: The pressure of the water injected into the pipeline is obtained. If the pressure of the water injected into the pipeline is greater than the preset value, the injector continues to draw out liquid until the pressure of the water injected into the pipeline is within the preset range. If the flow rate of water injected into the pipeline increases, the step of controlling the injection of liquid by the injector further includes: The pressure of the water injected into the pipeline is obtained. If the pressure of the water injected into the pipeline is less than the preset value, the injector is controlled to continue injecting liquid until the pressure of the water injected into the pipeline is within the preset range.

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