Long-distance pipeline pressure test drainage filtering circulation recycling device and construction method

Abstract

The embodiment of the application provides a long-distance pipeline pressure test drainage filtering circulation recycling device and a construction method, which comprise a treatment tank, a pressure relief assembly and a filtering assembly; the pressure relief assembly comprises a main pipe, a shell and a pipe body, the filtering assembly comprises a filter screen; the shell, the pipe body and the filter screen are arranged in the treatment tank, the shells are arranged at intervals along the axial direction of the pipe body, a snail-shaped cavity is formed in the shell, and an outlet is formed in the shell and communicates with the water outlet end of the snail-shaped cavity; the pipe body is arranged in the center of the multiple shells and communicates with the multiple outlets respectively, and the filter screen is arranged in the pipe body. The application relates to the field of oil and gas long-distance pipeline construction and maintenance. The snail-shaped cavities in the multiple shells are used for preliminary vortex buffering and coarse separation, and the filter screen in the pipe body is used for precise filtering, so that different particle size impurities in pressure test drainage are effectively removed, and the filtering effect is significantly better than that of the existing single-stage filtering mode.

Description

Technical Field

[0001] This invention relates to the field of construction and maintenance of long-distance oil and gas pipelines, specifically to a long-distance pipeline pressure test drainage filtration and recycling device and construction method. Background Technology

[0002] Before long-distance pipelines are put into operation, they must undergo rigorous hydrostatic testing to verify their strength and sealing. This testing process generates a large amount of pressurized drainage, which typically contains impurities such as welding slag, rust, and silt, and is under high pressure. Direct discharge not only wastes water resources but also pollutes the environment; simple collection and reuse, however, can easily clog equipment or affect the quality of subsequent pressure tests due to the high impurity content and unstable pressure.

[0003] In existing technologies, common pressure test drainage treatment methods often employ single-stage filtration or simple sedimentation tanks, which have the following problems: low filtration accuracy and poor efficiency, making it difficult to effectively remove fine impurities; lack of effective pressure buffering and flow balancing mechanisms, easily leading to water hammer or local overload; difficulty in cleaning the filter device, often requiring shutdown and disassembly, resulting in high maintenance costs and low operating efficiency; lack of a closed-loop recycling system, leading to low water resource utilization; and the depressurization process is not safe and fast enough, posing certain construction safety hazards.

[0004] Therefore, there is an urgent need to develop pressure testing and drainage treatment devices and methods that can achieve filtration, automatic or semi-automatic cleaning, rapid pressure relief, and water resource recycling to meet the construction needs of large-scale, high-efficiency, and environmentally friendly long-distance pipelines. Summary of the Invention

[0005] According to embodiments of the present invention, a device and construction method for the drainage filtration and recycling system for long-distance pipeline pressure testing are provided. This addresses the technical problems existing in the background art described above.

[0006] In a first aspect of the invention, a long-distance pipeline pressure test drainage filtration and recycling device is provided.

[0007] The long-distance pipeline pressure test drainage filtration and recycling device includes a treatment tank, a pressure relief assembly, and a filter assembly; The pressure relief assembly includes a main pipe, a housing, and a pipe body; the filter assembly includes a filter screen. The shell, the tube and the filter screen are disposed inside the treatment tank. The shell is spaced apart along the axial direction of the tube. A spiral cavity is formed inside the shell. The spiral cavity has an inlet end located on the outer periphery of the shell and an outlet end located on the center side of the shell. The main tube is connected to the inlet ends of the plurality of spiral cavities respectively. The shell has an outlet that communicates with the water outlet of the spiral cavity; the tube passes through the center side of the multiple shells and communicates with the multiple outlets respectively, and the filter screen is disposed in the tube.

[0008] Preferably, there are multiple pressure relief components and multiple filter components, which are spaced apart along the vertical direction of the treatment tank. Each filter component is arranged corresponding to a pressure relief component, and the filter component at the corresponding position is located below the outlet of the corresponding pressure relief component.

[0009] Preferably, the pressure relief assembly further includes multiple regulating valves, which are respectively disposed between the main pipe and the inlet end of the multiple volute cavities. The regulating valves are used to regulate the water flow rate entering the corresponding volute cavity.

[0010] Preferably, the plurality of housings are arranged sequentially along the axial direction of the treatment tank, and the initial opening of the regulating valve near the water inlet end of the main pipe is smaller than the initial opening of the regulating valve far from the water inlet end of the main pipe.

[0011] Preferably, it also includes a storage tank and a connecting assembly, the connecting assembly including a pressure pipeline, a test head, and a drain interface; The main pipe is provided with the drain interface, and the drain end of the pressure pipe is provided with the test head. The test head is detachably connected to the drain interface so that the test drainage in the pressure pipe enters the main pipe through the test head and the drain interface.

[0012] Preferably, the filter assembly further includes multiple second rods, sleeves, drainage channels, baffles, bottom shells, and bottom plates; The second rod is connected to the filter screen. A sleeve is provided on the outer side of the tube. The filter screen fits against the inner wall of the sleeve. The inner side of the sleeve is connected to the baffle. The filter screen is provided with a partition and a notch. The partition divides the filter screen into two areas. The notch passes through both sides of the partition. The sleeve is provided with a drain outlet that matches the notch. The baffle covers one area of ​​the filter screen and fits against the top of the partition. The bottom of the filter screen is connected to a bottom shell connected to the inner wall of the sleeve. The bottom shell is provided with multiple holes. The bottom of the bottom shell is connected to the bottom plate.

[0013] Preferably, the filter assembly includes one cleaning channel that is connected to one of the plurality of drainage channels, the cleaning channel passing through the treatment tank.

[0014] Preferably, the filter assembly further includes a water inlet pipe; the water inlet pipe passes sequentially through the base plate, the sleeve, and the treatment tank, and the water inlet pipe is used to replenish the water source.

[0015] In a second aspect of the invention, a construction method for the recycling and reuse of drainage water during pressure testing of long-distance pipelines is provided.

[0016] The method includes the following steps: S1. Install the treatment tank vertically, and set multiple sets of pressure relief components and filter components at intervals along its height. Connect the test head to the drain interface on the main pipe, and connect the storage tank, circulation pump, transfer box, pump body and cleaning pipe to form a closed loop. S2, the test pressure drainage enters the main pipe through the test pressure head, and is distributed to each spiral cavity through the regulating valve with an initial opening gradient distribution. After being buffered by the vortex, it enters the pipe body; S3: Water flows from top to bottom, is filtered through a filter screen, enters a storage tank for temporary storage, and is then reused or discharged through a drain pipe. S4, when the cleaning conditions are met, the motor is started to drive the first synchronous pulley, which makes the filter screen rotate 180° and at the same time drives the arc baffle to rotate 45° through the belt drive with a gear ratio of 1:4 to connect the cleaning water circuit and start the pump body; S5, the pump body uses the recycled water from the storage tank to backwash the filter screen through the bottom shell holes, and the flushing water carrying impurities is discharged through the opening and drain outlet; S6. During rinsing, the first and second protrusions contact to push the gate to compress the spring and open the top opening of the pipe to achieve rapid pressure relief. After rinsing, the motor resets to return the filter, arc baffle and gate to their initial state, and steps S2 to S6 are repeated.

[0017] Preferably, after the filter screen rotates 180°, its notch aligns with the drain outlet of the sleeve, and the baffle coverage area and the filtration area are interchanged; at the same time, the first protrusion contacts the second protrusion to force open the gate, and the spring provides automatic pressure relief protection during daily operation.

[0018] One or more technical solutions provided in this application have at least the following technical effects or advantages: The long-distance pipeline test drainage filtration recycling device and construction method provided by the present invention uses multiple spiral cavities in the shell for preliminary vortex buffering and coarse separation, and then combines them with the filter screen in the pipe body for precision filtration, effectively removing impurities of different particle sizes in the test drainage. The filtration effect is significantly better than the existing single-stage filtration method.

[0019] The initial opening of the multiple regulating valves on the main pipe is distributed in a gradient, which can effectively compensate for the pressure loss along the flow path and make the water intake of each parallel spiral cavity basically balanced. The vortex flow formed by the spiral cavity further realizes pressure buffering, reduces the risk of water hammer, and protects the downstream filter structure.

[0020] Multiple pressure relief components and filter components are integrated and arranged along the height of the treatment tank, which has a small footprint and is particularly suitable for use in the field or station construction sites of long-distance pipelines.

[0021] The filter screen is installed inside the tube and can be used in conjunction with the subsequent cleaning system to achieve online or rapid cleaning, reducing downtime and reducing the intensity of manual maintenance.

[0022] With the subsequent storage tank and recycling system, the treated water can be reused for the next pressure test or other construction phases, significantly saving water resources and reducing environmental emissions.

[0023] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of the present invention, nor is it intended to restrict the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0024] The above and other features, advantages, and aspects of the various embodiments of the present invention will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein: Figure 1 A three-dimensional connection structure diagram of a long-distance pipeline pressure test drainage filtration and recycling device according to an embodiment of the present invention is shown; Figure 2 A partial connection structure diagram of a long-distance pipeline pressure test drainage filtration and recycling device according to an embodiment of the present invention is shown; Figure 3 An exploded view of a long-distance pipeline pressure test drainage filtration and recycling device according to an embodiment of the present invention is shown; Figure 4 A cross-sectional view of a long-distance pipeline pressure test drainage filtration and recycling device according to an embodiment of the present invention is shown; Figure 5 An exploded view of the pressure relief assembly of a long-distance pipeline pressure test drainage filtration recycling device according to an embodiment of the present invention is shown; Figure 6 A schematic diagram of the connection structure of the drive assembly of the long-distance pipeline pressure test drainage filtration recycling device according to an embodiment of the present invention is shown. Figure 7 A plan sectional view of the pressure relief assembly of a long-distance pipeline pressure test drainage filtration and recycling device according to an embodiment of the present invention is shown; Figure 8 A partial cross-sectional view of the pressure relief assembly of a long-distance pipeline pressure test drainage filtration and recycling device according to an embodiment of the present invention is shown; Figure 9A schematic diagram of the connection structure of the filter assembly of a long-distance pipeline pressure test drainage filtration and recycling device according to an embodiment of the present invention is shown. Figure 10 An exploded view of the filter assembly of a long-distance pipeline pressure test drainage filtration and recycling device according to an embodiment of the present invention is shown; Figure 11 A schematic diagram of the connection structure of the protection components of a long-distance pipeline pressure test drainage filtration and recycling device according to an embodiment of the present invention is shown. Figure 12 A flowchart illustrating a construction method for a long-distance pipeline pressure test drainage filtration recycling method according to an embodiment of the present invention is shown.

[0025] The attached figures are labeled as follows: 1-Connecting assembly, 11-Drain pipe, 12-Drainage pipe, 13-Circulating pump, 14-Transfer box, 15-Pump body, 16-Cleaning pipe, 17-Test head, 18-Drainage interface, 19-Pressure pipeline, 2-Pressure relief assembly, 21-Main pipe, 22-Regulating valve, 23-Shell, 231-Roller cavity, 232-Outlet, 24-Pipe body, 3-Treatment tank, 4-Storage tank, 5-Filter assembly, 51-Second rod, 52-Sleeve, 521-Drain outlet, 53-Drainage channel, 54-Cleaning channel, 55-Baffle, 56-Filter screen, 561-Partition, 562-Notch, 5 7-Bottom shell, 571-Hole body, 58-Bottom plate, 59-Water inlet pipe, 6-Protective component, 61-Gate plate, 62-First protrusion, 63-Second protrusion, 64-Pad plate, 641-Air hole, 65-Slide rod, 66-Spring, 67-Top plate, 68-Cylinder, 681-Exhaust hole, 7-Cleaning component, 71-Supply pipe, 72-Two plates, 73-Connecting rod, 74-Arc baffle, 741-Round hole, 75-Support frame, 76-Connecting column, 8-Drive component, 81-First rod body, 82-Motor, 83-Second synchronous pulley, 84-Belt, 85-First synchronous pulley. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Furthermore, the term "and / or" in this article only describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects are in an "or" relationship.

[0028] like Figures 1 to 11 As shown, the long-distance pipeline pressure test drainage filtration recycling device includes a treatment tank 3, a pressure relief component 2, a filter component 5, a storage tank 4, a connection component 1, a cleaning component 7, a protection component 6, and a drive component 8.

[0029] The connecting assembly 1 includes a pressure pipe 19, a test head 17, a drain interface 18, a drain pipe 11, a drain pipe 12, a circulating pump 13, a transfer box 14, a pump body 15, and a cleaning pipe 16. The main pipe 21 is equipped with a drain interface 18, and the drain end of the pressure pipe 19 is equipped with a test head 17. The test head 17 and the drain interface 18 are detachably connected, allowing the test-pressure drain in the pressure pipe 19 to enter the main pipe 21 via the test head 17 and the drain interface 18. A storage tank 4 is located on the outlet side of the treatment tank 3 and is used to temporarily store water treated by the pressure relief assembly 2 and the filter assembly 5. The drain pipe 12 communicates with the storage tank 4 to transport the water in the storage tank 4 to an external reuse end or the next test pipe section. One end of the drain pipe 11 is connected to the storage tank 4, and the other end is connected to the inlet of the circulation pump 13. The outlet of the circulation pump 13 is connected to the transfer box 14. The transfer box 14 is connected to the filter assembly 5 through the cleaning pipe 16. The pump body 15 is installed on the cleaning pipe 16.

[0030] The storage tank 4 is equipped with a secondary filtration structure, which includes a multi-layer filter assembly and an activated carbon adsorption layer. After initial filtration by the filter assembly 5 in the treatment tank 3, the pressure test wastewater enters the storage tank 4. It then passes through the multi-layer filter assembly in the storage tank 4 to further remove fine suspended solids and some dissolved impurities. Finally, it passes through the activated carbon adsorption layer to adsorb odors and trace organic matter before being discharged. This achieves the true filtration effect of the entire system, ensuring that the reclaimed water quality meets the requirements for subsequent pressure testing or discharge.

[0031] There are multiple pressure relief components 2 and multiple filter components 5. These multiple pressure relief components 2 and multiple filter components 5 are spaced apart along the vertical direction of the treatment tank 3, and each filter component 5 corresponds to one of the multiple pressure relief components 2. The filter component 5 at the corresponding position is located below the outlet 232 of the corresponding pressure relief component 2. The pressure relief component 2 includes a main pipe 21, multiple regulating valves 22, multiple housings 23, and a pipe body 24. The multiple housings 23 are spaced apart along the axial direction of the pipe body 24. Each housing 23 has a spiral cavity 231 formed within it. The spiral cavity 231 has an inlet end located on the outer periphery of the housing 23 and an outlet end located on the center side of the housing 23. The main pipe 21 communicates with the inlet ends of the multiple spiral cavities 231. An outlet 232 communicating with the outlet end of the spiral cavity 231 is provided on the housing 23. The pipe body 24 passes through the center side of the multiple housings 23 and communicates with the multiple outlets 232. Multiple regulating valves 22 are respectively installed between the main pipe 21 and the inlet ends of multiple spiral cavities 231 to regulate the water flow rate entering the corresponding spiral cavities 231. Multiple housings 23 are arranged sequentially along the axial direction of the treatment tank 3. The initial opening of the regulating valve 22 closer to the inlet end of the main pipe 21 is smaller than that of the regulating valve 22 farther away from the inlet end of the main pipe 21, thereby compensating for the pressure loss along the main pipe 21 and making the water flow rate of each spiral cavity 231 tend to be balanced.

[0032] The filter assembly 5 includes multiple second rods 51, sleeves 52, drain channels 53, baffles 55, bottom shells 57, bottom plates 58, and filter screens 56, as well as a cleaning channel 54 and an inlet pipe 59. The second rods 51 are connected to the filter screen 56. A sleeve 52 is provided on the outer side of the tube 24, and the filter screen 56 is fitted against the inner wall of the sleeve 52. The inner side of the sleeve 52 is connected to the baffle 55. The filter screen 56 has a partition 561 and a notch 562. The partition 561 divides the filter screen 56 into two areas, and the notch 562 passes through both sides of the partition 561. A drain outlet 521 is provided on the sleeve 52 and matches the notch 562. The baffle 55 covers one area of ​​the filter screen 56 and is fitted against the top of the partition 561. The bottom of the filter screen 56 is connected to the bottom shell 57, which is attached to the inner wall of the sleeve 52. The bottom shell 57 has multiple holes 571, and its bottom is connected to the bottom plate 58. The cleaning channel 54 is connected to multiple drainage channels 53 and passes through the treatment tank 3. The water inlet pipe 59 passes through the bottom plate 58, the sleeve 52, and the treatment tank 3 in sequence to supply water.

[0033] The number of cleaning components 7 corresponds to the number of pressure relief components 2. Each cleaning component 7 includes a supply pipe 71, two plates 72, a connecting column 76, a support frame 75, an arc-shaped baffle 74, and a connecting rod 73. The supply pipe 71 passes through the support frame 75 and connects to the cleaning pipe 16, while also communicating with the water inlet pipe 59. The support frame 75 has an arc-shaped groove inside, and the arc-shaped baffle 74 is located inside the arc-shaped groove, with its curvature being smaller than that of the arc-shaped groove, used to isolate the supply pipe 71. The arc-shaped baffle 74 is connected to the first rod body 81 via the connecting rod 73. The two plates 72 are connected by the connecting column 76, and the support frame 75 is connected to the inside of the treatment tank 3. Adjacent sets of cleaning components 7 are connected by two adjacent plates 72. A circular hole 741 is provided on the arc-shaped baffle 74. When the circular hole 741 is rotated to align with the flow channel of the supply pipe 71, the cleaning water path is connected; when the circular hole 741 is misaligned, the cleaning water path is isolated.

[0034] The protective assembly 6 includes a gate 61, a first protrusion 62, a second protrusion 63, a pad 64, multiple vent holes 641 disposed on the pad 64, a slide rod 65, a spring 66, a top plate 67, a protective sleeve 68, and multiple exhaust holes 681 disposed on the protective sleeve 68. The gate 61 is connected to the slide rod 65, which is slidably connected to the top plate 67. The top plate 67 is connected to the inside of the processing tank 3. The spring 66 is sleeved on the slide rod 65, with its two ends connected to the top plate 67 and the gate 61, respectively. The gate 61 can close the opening at the top of the tube 24. A first protrusion 62 is disposed at the bottom of the gate 61. A second rod 51 passes through the gate 61 and is connected to the pad 64. A second protrusion 63 is connected to the pad 64, and the first protrusion 62 and the second protrusion 63 can contact each other. The protective sleeve 68 is sleeved on the top region of the tube 24, and its exhaust holes 681 are used to assist in the discharge of gas during depressurization.

[0035] The drive assembly 8 includes a motor 82, a first synchronous pulley 85, a second synchronous pulley 83, a first rod 81, and a belt 84. The motor 82 is connected inside the treatment tank 3, and its output end is connected to the first synchronous pulley 85. The first synchronous pulley 85 is connected to the second synchronous pulley 83 via the belt 84, and the second synchronous pulley 83 is connected to the first rod 81. The first synchronous pulley 85 is also connected to the second rod 81. The gear ratio between the first synchronous pulley 85, driven directly by the motor 82, and the second synchronous pulley 83, driven by the belt 84, is 1:4. This ensures that when the second rod 81 drives the filter screen 56 to rotate 180°, the first rod 81 drives the arc-shaped baffle 74 to rotate only 45°, achieving precise synchronization between filter screen rotation and the opening of the cleaning water path.

[0036] In actual use, the test pressure drainage enters the main pipe 21 through the test pressure head 17 and the drainage interface 18, and is then distributed to multiple spiral cavities 231 according to the preset initial opening degree through the regulating valves 22. The water flow forms a vortex in the spiral cavities 231, achieving initial pressure buffering and initial separation of impurities. Subsequently, it enters the pipe body 24 through the central outlet and outlet 232, and then flows downward through the filter screen 56 of the corresponding filter assembly 5 to complete filtration. The filtered clean water enters the storage tank 4 for temporary storage, and can be transported to the external reuse end or the next test pressure section through the drain pipe 12 to realize the recycling of water resources. When the water level or water quality in the storage tank 4 reaches the set conditions, the circulation pump 13 can send part of the water to the transfer tank 14 for standby.

[0037] When the filter screen 56 needs cleaning, the motor 82 is started. The first synchronous pulley 85 directly drives the second rod 51, causing the filter screen 56 to rotate 180°. At the same time, the first rod 81 is driven by the belt 84 and the second synchronous pulley 83, causing the arc-shaped baffle 74 to rotate 45°, aligning its circular hole 741 with the flow channel of the supply pipe 71, thus connecting the cleaning water path. At this time, after the predetermined rotation angle is detected by the position sensor or encoder of the motor 82, the pump body 15 is automatically started, transporting the water in the transfer box 14 to the bottom shell 57 through the cleaning pipe 16, the supply pipe 71, and the water inlet pipe 59, and backwashing the filter screen 56 through multiple holes 571. The flushing water carrying impurities is discharged from the treatment tank 3 through the notch 562 on the filter screen 56, the drain port 521 of the sleeve 52, the drain channel 53, and the cleaning channel 54, achieving online cleaning without disassembly. After rotating 180°, the area originally covered by the baffle 55 is swapped with the uncovered area. Combined with the alignment of the notch 562 and the drain outlet 521, the reverse flushing is highly targeted and the cleaning is thorough.

[0038] Simultaneously, the first protrusion 62 contacts the second protrusion 63, pushing the gate 61 upward to compress the spring 66, causing the gate 61 to separate from the top opening of the pipe body 24, achieving rapid pressure relief, reducing the pressure inside the pipe body 24, and protecting the filter screen 56 and system safety. The vent hole 681 on the casing 68 assists in the rapid discharge of gas. During normal operation, if the pressure inside the pipe body 24 abnormally increases, the gate 61 can automatically move upward under the action of the spring 66 to achieve overpressure protection, without the need for a motor drive.

[0039] After flushing and depressurization, motor 82 reverses its direction or continues to operate to the reset position. Arc-shaped baffle 74 rotates back to its blocking position, cutting off the cleaning water path. Pump 15 stops operating, and gate 61 resets under the action of spring 66, closing the top opening of pipe 24. Filter screen 56 resets to its initial filtration state. Throughout the process, a single drive of motor 82 simultaneously achieves four actions: filter screen rotation and cleaning, automatic connection of the cleaning water path, pump 15 start-up and backflushing, and forced rapid depressurization. This significantly reduces the manufacturing cost and subsequent maintenance cost of the device, and improves the safety and efficiency of pressure testing operations on long-distance pipelines. The depressurization assembly 2 and the filter assembly 5 are arranged vertically at intervals, realizing step-by-step pressure release and filtration of the test drainage, further improving the treatment effect and recycling rate.

[0040] In a specific embodiment, the initial opening gradient of the regulating valves 22 is set as follows: the initial opening of the first regulating valve 22 closest to the water inlet end of the main pipe 21 is 20%, the initial opening of the regulating valve 22 in the middle position is 35%, and the initial opening of the regulating valve 22 furthest from the water inlet end of the main pipe 21 is 55%. This opening parameter can be adjusted by ±10% according to the length of the main pipe 21, the test pressure, and the impurity content of the incoming water to ensure that the water inlet volume of each spiral cavity 231 is basically balanced.

[0041] like Figure 12 As shown, another embodiment of the present invention also provides a construction method for the recycling and reuse of drainage water from long-distance pipeline pressure testing, the method comprising the following steps: S1: Device installation and pipeline connection: Vertically install the treatment tank 3 at the pressure test site, and fix multiple sets of pressure relief components 2 and corresponding filter components 5 at intervals along the vertical direction of the treatment tank 3; detachably connect the drain interface 18 on the main pipe 21 to the pressure test head 17, and connect the water inlet end of the pressure test head 17 to the pressure pipeline 19 to be tested; place the storage tank 4 on the water outlet side of the treatment tank 3, and connect the drain pipe 12 to the external reuse end or the next pressure test pipeline section; connect the drain pipe 11, circulating pump 13, transfer box 14, pump body 15 and cleaning pipe 16 in sequence to form a closed-loop water circuit; supply multiple cleaning components 7... Pipe 71 is connected to cleaning pipe 16 and water inlet pipe 59 of corresponding filter component 5 respectively; the motor 82, first synchronous pulley 85, second synchronous pulley 83, belt 84, first rod 81 and second rod 51 of drive component 8 are installed in place to ensure that the first synchronous pulley 85 and the second rod 51 are directly driven, and the first synchronous pulley 85 is driven by the second synchronous pulley 83 through belt 84 at a gear ratio of 1:4; the gate 61, slide rod 65, spring 66, top plate 67, protective sleeve 68 and protrusion mechanism of protection component 6 are assembled on the top of pipe body 24, so that the second rod 51 passes through the gate 61 and connects with pad 64.

[0042] S2: Pressure test drainage introduction and flow equalization distribution: Start pressure test operation. The pressure test drainage in the pipeline enters the main pipe 21 through pressure pipeline 19, pressure test head 17 and drainage interface 18; Adjust the initial opening of each regulating valve 22 so that the opening of the regulating valve 22 near the water inlet end of the main pipe 21 is smaller than the opening of the regulating valve 22 far from the water inlet end, to compensate for the pressure loss along the main pipe 21 and realize the balanced distribution of water inlet of each parallel branch.

[0043] S3: Vortex buffering and initial impurity separation. The test pressure drainage enters the spiral cavity 231 of each shell 23 through the regulating valve 22. A vortex flow is formed in the spiral cavity 231 to achieve initial pressure buffering and centrifugal separation of larger particles. The water flow after vortexing enters the pipe body 24 from the outlet end on the center side of the spiral cavity 231 through the outlet 232.

[0044] S4: Precision filtration. Water flows through multiple vertically spaced filter components 5 from top to bottom within the pipe body 24. Each filter screen 56 performs precision filtration on the water flow in a state where it is partially covered by the baffle 55. Impurities are trapped on the surface of the filter screen 56, and the uncovered area serves as the main filtration channel. The filtration achieves the step-by-step removal of impurities of different particle sizes.

[0045] S5: Filtered water collection, temporary storage and reuse. The filtered clean water enters the storage tank 4 from the lower end of the pipe 24 for temporary storage. According to the site requirements, the water in the storage tank 4 is directly transported to the external reuse end through the drain pipe 12 for pressure testing, water replenishment, site cleaning, or discharge. When the water level in the storage tank 4 reaches the set value or when a water source needs to be prepared for cleaning, the circulation pump 13 is started to transport part of the water through the drain pipe 11 to the transfer box 14 for storage and backup.

[0046] S6: Filter cleaning trigger and cleaning mode start. When the pressure difference between the two sides of the filter 56 reaches the set threshold, the cumulative running time reaches the preset value, or a manual cleaning command is received, the automatic cleaning mode is entered; the motor 82 is started to prepare for the linkage cleaning and pressure relief operation.

[0047] S7: The single-motor driven synchronous indexer is connected to the water circuit. The motor 82 drives the first synchronous pulley 85 to rotate, and the first synchronous pulley 85 directly drives the second rod 51, causing the filter screen 56 to rotate 180°. At the same time, the first synchronous pulley 85 drives the second synchronous pulley 83 through the belt 84, where the gear ratio is 1:4. The second synchronous pulley 83 drives the first rod 81, causing the arc-shaped baffle 74 to rotate 45°. When the round hole 741 on the arc-shaped baffle 74 is aligned with the flow channel of the supply pipe 71, the cleaning water circuit is automatically connected. After the position sensor of the motor 82 detects the predetermined angle, the pump body 15 is automatically started.

[0048] S8: Backwashing and impurity discharge. Pump body 15 transports the recycled water in transfer box 14 to bottom shell 57 through cleaning pipe 16, supply pipe 71, and inlet pipe 59. Water flows through multiple holes 571 on bottom shell 57 to backwash filter screen 56 from below. Since filter screen 56 has rotated 180°, the original filter working surface is now aligned with notch 562 and drain port 521 of sleeve 52. With the cooperation of baffle 55 and partition 561, the flushing water carrying impurities is discharged from treatment tank 3 through notch 562, drain port 521, drain channel 53 and cleaning channel 54, realizing online backwashing without disassembly.

[0049] S9: Synchronous forced rapid pressure relief and dual protection. As the filter screen 56 rotates to the cleaning position, the first protrusion 62 and the second protrusion 63 contact each other, pushing the gate 61 upward to compress the spring 66, causing the gate 61 to separate from the top opening of the tube body 24; the high-pressure medium inside the tube body 24 is rapidly released upward, and the auxiliary gas is quickly discharged through the exhaust hole 681 on the sleeve 68, realizing forced rapid pressure relief at the moment of cleaning; at the same time, the spring 66 and the gate 61 constitute a daily automatic pressure relief mechanism. When the pressure inside the tube body 24 rises abnormally, the gate 61 can automatically move upward to realize overpressure protection.

[0050] S10: Reset and preparation for the next cycle. After cleaning and depressurization, motor 82 reverses or continues to run to the reset angle; arc-shaped baffle 74 rotates back to the blocking position, cutting off the cleaning water path, and pump body 15 stops running; gate 61 resets under the action of spring 66, resealing the top opening of pipe body 24; filter screen 56 rotates back to the initial filtration position, and baffle 55 covers another area to prepare for the next filtration; the entire system returns to normal filtration mode and enters the next pressure test and drainage treatment cycle or waits for the next cleaning command.

[0051] S11: Closed-loop circulation and continuous operation, repeating steps S2 to S10 to achieve continuous filtration, closed-loop reuse, and automatic maintenance of pressure test drainage; vertical arrangement allows for step-by-step pressure release and step-by-step filtration; single motor drive enables simultaneous filter cleaning, cleaning water circuit connection, and rapid pressure relief, significantly improving construction efficiency, reducing water consumption and equipment maintenance costs, and ensuring the safe and efficient conduct of long-distance pipeline pressure testing.

[0052] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A long-distance pipeline pressure test drainage filtration and recycling device, characterized in that, It includes a treatment tank (3), a pressure relief assembly (2), and a filter assembly (5); The pressure relief assembly (2) includes a main pipe (21), a housing (23) and a pipe body (24), and the filter assembly (5) includes a filter screen (56). The shell (23), the pipe (24) and the filter screen (56) are disposed inside the treatment tank (3). The shell (23) is spaced apart along the axial direction of the pipe (24). A spiral cavity (231) is formed inside the shell (23). The spiral cavity (231) has an inlet end located on the outer periphery of the shell (23) and an outlet end located on the center side of the shell (23). The main pipe (21) is connected to the inlet ends of the plurality of spiral cavities (231) respectively. The housing (23) has an outlet (232) that communicates with the water outlet of the spiral cavity (231); the tube (24) passes through the center side of multiple housings (23) and communicates with multiple outlets (232) respectively; the filter screen (56) is disposed inside the tube (24).

2. The long-distance pipeline pressure test drainage filtration and recycling device according to claim 1, characterized in that, The number of pressure relief components (2) and filter components (5) are both multiple. Multiple pressure relief components (2) and multiple filter components (5) are arranged at intervals along the vertical direction of the treatment tank (3), and multiple filter components (5) are respectively arranged corresponding to multiple pressure relief components (2). The filter component (5) at the corresponding position is arranged below the outlet (232) in the corresponding pressure relief component (2).

3. The long-distance pipeline pressure test drainage filtration and recycling device according to claim 2, characterized in that, The pressure relief assembly (2) also includes a plurality of regulating valves (22), which are respectively disposed between the main pipe (21) and the inlet end of the plurality of spiral cavities (231).

4. The long-distance pipeline pressure test drainage filtration and recycling device according to claim 3, characterized in that, Multiple housings (23) are arranged sequentially along the axial direction of the treatment tank (3), and the initial opening of the regulating valve (22) near the water inlet end of the main pipe (21) is smaller than the initial opening of the regulating valve (22) far from the water inlet end of the main pipe (21).

5. The long-distance pipeline pressure test drainage filtration and recycling device according to claim 4, characterized in that, It also includes a storage tank (4) and a connecting assembly (1), the connecting assembly (1) including a pressure pipe (19), a test head (17), and a drain interface (18). The main pipe (21) is provided with the drain interface (18), and the drain end of the pressure pipe (19) is provided with the test head (17). The test head (17) and the drain interface (18) are detachably connected so that the test drainage in the pressure pipe (19) enters the main pipe (21) through the test head (17) and the drain interface (18).

6. The long-distance pipeline pressure test drainage filtration and recycling device according to claim 2, characterized in that, The filter assembly (5) also includes multiple second rods (51), sleeves (52), drainage channels (53), baffles (55), bottom shells (57) and bottom plates (58). The second rod (51) is connected to the filter screen (56). The sleeve (52) is provided on the outside of the tube (24). The filter screen (56) is attached to the inner wall of the sleeve (52). The inner side of the sleeve (52) is connected to the baffle (55). The filter screen (56) is provided with a partition (561) and a notch (562). The partition (561) divides the filter screen (56) into two areas. The notch (562) passes through both sides of the partition (561). The sleeve (52) is provided with a drain outlet (521) and the drain outlet (521) matches the notch (562). The baffle (55) covers an area on the filter screen (56) and fits against the top of the partition (561). The bottom of the filter screen (56) is connected to the bottom shell (57) connected to the inner wall of the sleeve (52). The bottom shell (57) is provided with a plurality of holes (571). The bottom of the bottom shell (57) is connected to the bottom plate (58).

7. The long-distance pipeline pressure test drainage filtration and recycling device according to claim 6, characterized in that, The filter assembly (5) includes one cleaning channel (54) that is connected to one of the multiple drainage channels (53).

8. The long-distance pipeline pressure test drainage filtration and recycling device according to claim 7, characterized in that, The filter assembly (5) also includes a water inlet pipe (59); the water inlet pipe (59) passes through the base plate (58), the sleeve (52) and the treatment tank (3) in sequence, and the water inlet pipe (59) is used to replenish the water source.

9. A construction method for the recycling and reuse of drainage water from long-distance pipeline pressure testing, characterized in that: This method, applied to the long-distance pipeline pressure test drainage filtration and recycling device according to any one of claims 1 to 8, includes the following steps: S1, install the treatment tank (3) vertically, set multiple pressure relief components (2) and filter components (5) at intervals along its height direction, connect the test head (17) to the drain interface (18) on the main pipe (21), and connect the storage tank (4), circulation pump (13), transfer box (14), pump body (15) and cleaning pipe (16) to form a closed loop; S2, the test pressure drainage enters the main pipe (21) through the test pressure head (17), and is distributed to each spiral cavity (231) through the regulating valve (22) with the initial opening degree in gradient distribution, and enters the pipe body (24) after being buffered by the vortex. S3, water flows from top to bottom through the filter screen (56) and enters the storage tank (4) for temporary storage, and is reused or discharged through the drain pipe (12); S4. When the cleaning conditions are met, start the motor (82) to drive the first synchronous pulley (85), so that the filter screen (56) rotates 180° and at the same time, the arc baffle (74) rotates 45° through the belt drive with a gear ratio of 1:4 to connect the cleaning water circuit and start the pump body (15). S5, the pump body (15) backwashes the filter screen (56) with the recycled water from the storage tank (4) through the bottom shell (57) hole (571), and the flushing water carrying impurities is discharged through the notch (562) and the drain (521); S6. During rinsing, the first protrusion (62) and the second protrusion (63) contact each other to push the gate (61) to compress the spring (66) and open the top opening of the tube (24) to achieve rapid pressure relief. After rinsing, the motor (82) resets so that the filter (56), the arc baffle (74) and the gate (61) return to the initial state, and steps S2 to S6 are repeated.

10. The construction method for the recycling and reuse of drainage water during long-distance pipeline pressure testing according to claim 9, characterized in that: After the filter screen (56) rotates 180°, its notch (562) aligns with the drain outlet (521) of the sleeve (52), and the area covered by the baffle (55) is interchanged with the filtration area; at the same time, the first protrusion (62) and the second protrusion (63) contact to force open the gate (61), and the spring (66) provides automatic pressure relief protection during daily operation.

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