Spiral push pig for natural gas pipelines

Abstract

The utility model relates to natural gas pipeline technical field provides a kind of natural gas pipeline's spiral propulsion pig, including water tank, the spiral propulsion pig of this natural gas pipeline further includes: negative pressure recovery tank, is installed in one end of the water tank;In the utility model, by setting multiple telescopic negative pressure suction pipes along the uniform distribution of the outer circumferential ring of negative pressure recovery tank, 360° full coverage of pipeline inner wall can be realized, and the telescopic feature can automatically adjust length according to the inner diameter of pipeline, without replacing adaptive component, suction hood opening is towards pipe wall, increase the dirt suction area while avoiding suction port blockage, solve the problem that traditional pig dirt suction range is limited, need to frequently replace specification, expand the range of adaptation, improve the dirt capture coverage of pipeline inner wall, there is no local residual dead angle, and pig cleaning completeness is significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of natural gas pipeline technology, and in particular to a spiral propulsion pig for natural gas pipelines. Background Technology

[0002] Natural gas pipelines are pipeline systems used to transport natural gas. They are usually made of steel or plastic materials and play an important role in the production, transportation and distribution of natural gas. During long-term transportation, the inner wall of natural gas pipelines is prone to the accumulation of oil, water, rust and dust mixtures, which leads to a reduction in the inner diameter of the pipeline, an increase in transportation resistance, and in severe cases, corrosion and perforation of the pipeline, affecting transportation efficiency and operational safety.

[0003] In existing technology, such as Chinese Patent No. CN223288664U, a water tank is included. A first rotating shaft and a second rotating shaft are rotatably connected to the middle of both ends of the water tank. Circular plates are fitted onto the side walls of both the first and second rotating shafts. A first circular seat is fixed to one end of the first rotating shaft, and the first circular seat has a cavity structure and is connected to the first rotating shaft. A pull ring is rotatably connected to one end of the first circular seat. A second circular seat is fixed to one end of the second rotating shaft. Multiple U-shaped brackets are rotatably connected to the side walls of both ends of the water tank at equal intervals. This utility model can clean natural gas pipelines of different diameters. During the cleaning process, a water delivery mechanism, in conjunction with the first rotating shaft, injects cleaning solvent into the first circular seat and sprays it evenly onto the inner wall of the natural gas pipeline through multiple nozzles. This dissolves impurities and dirt on the inner wall of the natural gas pipeline, removing stubborn deposits and dirt, and improving the pipeline cleaning effect.

[0004] While the above solutions have the advantages mentioned above, their disadvantages are that the existing structure only has the functions of spraying dissolution and rotating scraping. The dissolved dirt and cleaning solvent are easy to remain in the pipes, requiring secondary pipe cleaning. Utility Model Content

[0005] The purpose of this invention is to solve the problem that existing structures only have the functions of spraying dissolution and rotating scraping, and the dissolved dirt and cleaning solvent are easily left in the pipeline, requiring secondary cleaning.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a spiral propulsion pig for a natural gas pipeline, comprising a water tank, and further comprising: A negative pressure recovery tank is installed at one end of the water tank; Multiple telescopic negative pressure suction pipes are installed on the outer surface of the negative pressure recovery box. The multiple telescopic negative pressure suction pipes are arranged in a ring and are connected to the inner cavity of the negative pressure recovery box. Multiple suction hoods are installed at the end of the telescopic negative pressure suction pipe away from the negative pressure recovery box, and the multiple suction hoods are connected to the telescopic negative pressure suction pipe; Multiple first filters are all located at one end of the telescopic negative pressure suction pipe near the negative pressure recovery box; Two first rotating shafts are rotatably mounted at the center points on both sides of the water tank; Two second rotating shafts are rotatably mounted above two first rotating shafts; An external sludge storage tank is installed at one end of the water tank; The filter element is installed inside the external sludge storage tank.

[0007] In a preferred embodiment, the filter element includes: The first mounting frame is installed on the top of the inner cavity of the external sludge storage tank; The second filter screen is disposed inside the first mounting frame; The second mounting frame is installed at the bottom of the inner cavity of the external sludge storage tank, and the second mounting frame is located at the bottom of the first mounting frame; An activated carbon filter layer is disposed in the middle of the second mounting frame; Two third filters, located at the top and bottom of the second mounting frame, enclose the activated carbon filter layer.

[0008] The technical effect of adopting the above-mentioned further solution is: to construct a multi-stage filtration system, firstly, medium impurities are intercepted by the second filter, then oil and fine particles are adsorbed by the activated carbon filter layer, and the third filter encapsulates activated carbon and performs secondary filtration, thereby improving the cleanliness of the medium, meeting the requirements for recycling, and reducing pollution.

[0009] In a preferred embodiment, the helical propulsion pig for the natural gas pipeline further includes: A negative pressure pump is installed inside the water tank; A first pipe is connected to one end of the negative pressure pump, the first pipe passes through one of the first rotating shafts, and the first pipe is connected to the inside of the negative pressure recovery box. The second pipe is connected to the other end of the negative pressure pump. The second pipe passes through another second rotating shaft and the external sludge tank. The second pipe is located at the top of one side of the external sludge tank and is connected to the inside of the external sludge tank.

[0010] The technical effect of adopting the above-mentioned further solution is that the negative pressure pump provides power, and in conjunction with the pipe that runs through the shaft, it stably transmits negative pressure, efficiently transports the dirt mixture to the storage tank, avoids pipe pulling damage, and ensures negative pressure transmission efficiency and operation continuity.

[0011] In a preferred embodiment, the helical propulsion pig for the natural gas pipeline further includes: A water supply pipe is installed on the top of the water tank and is connected to the inside of the water tank; A valve is installed on the water supply pipe.

[0012] The technical effects of adopting the above-mentioned further solutions are: the water supply pipe realizes the replenishment and return of the medium, the valve regulates the flow rate, prevents the medium leakage or pressure surge, ensures the stable operation of the equipment, reduces medium waste, and lowers operating costs.

[0013] In a preferred embodiment, the helical propulsion pig for the natural gas pipeline further includes: A water pump is installed on one side of the external sludge storage tank; A water pumping pipe is connected to the bottom end of the water pump, the water pumping pipe passes through one side of the external sludge storage tank, and the water pumping pipe is connected to the inner cavity of the external sludge storage tank. A delivery pipe is installed at the top of the water pump, and the delivery pipe can be connected to the top of the water supply pipe.

[0014] The technical effects of adopting the above-mentioned further solution are: forming a medium circulation path, the water pump extracts the purified medium, and returns it to the water tank through the delivery pipe, thereby improving the medium utilization rate, reducing the replenishment of fresh medium, extending the continuous operation mileage, and reducing environmental pressure.

[0015] In a preferred embodiment, the helical propulsion pig for the natural gas pipeline further includes: A sealing cap is installed on the top of the external sludge storage tank, and the sealing cap slides in fit with the top of the external sludge storage tank.

[0016] The technical effects of adopting the above-mentioned further solutions are: the sliding sealing cover ensures the airtightness of the sludge storage tank, prevents external impurities from entering and internal media from evaporating, protects the filtration system, extends the life of the filter elements, and improves the safety of the working environment.

[0017] In a preferred embodiment, the helical propulsion pig for the natural gas pipeline further includes: Two handles are fixedly installed on the top of the sealing cover, and the two handles are arranged symmetrically.

[0018] The technical advantages of adopting the above-mentioned further solutions are: symmetrical handles provide a stable force application point, facilitate quick opening and closing of the sealing cover, shorten maintenance time, reduce operation difficulty, adapt to single-person operation, and reduce labor costs.

[0019] In a preferred embodiment, the helical propulsion pig for the natural gas pipeline further includes: The opening is located on the side of the negative pressure recovery box near the water tank.

[0020] The technical effects of adopting the above-mentioned further solution are: balancing the air pressure of the negative pressure recovery box and the water tank, avoiding excessive local negative pressure that could cause pipeline deformation, stabilizing the negative pressure environment, improving the efficiency of dirt suction, and facilitating the inspection of the internal condition.

[0021] Compared with the prior art, the advantages and positive effects of this utility model are as follows: This invention utilizes multiple telescopic negative pressure suction pipes evenly distributed in a ring around the outer periphery of the negative pressure recovery box to achieve 360° full coverage of the pipe's inner wall. The telescopic feature automatically adjusts the length according to the pipe's inner diameter, eliminating the need to replace adapter parts. The suction hood opening faces the pipe wall, increasing the area for dirt suction while preventing clogging. This solves the problems of limited suction range and frequent specification changes required by traditional pipe cleaners, expanding the compatibility range, improving the dirt capture coverage of the pipe's inner wall, eliminating localized dead zones, and significantly improving the thoroughness of pipe cleaning. A first filter screen is installed at the front end of the dirt entering the negative pressure recovery box to intercept large particles in advance, preventing them from entering the subsequent negative pressure pump, first pipe, and second pipe, thus avoiding pipe blockage or negative pressure pump impeller wear and reducing equipment failure rate.

[0022] This invention employs a multi-stage design comprising a first mounting frame, a second filter, a second mounting frame, an activated carbon filter layer, and a third filter. The second filter intercepts medium-sized particulate impurities, the activated carbon filter layer adsorbs oil and microcolloids, and the third filter encapsulates activated carbon and further traps impurities, forming a gradient purification system. A water pump is fixed to one side of an external sludge storage tank, and a water pump pipe extends to the bottom of the tank's inner cavity. A delivery pipe can be connected to a water supply pipe, forming a closed-loop circulation path consisting of the external sludge storage tank, the water pump, the delivery pipe, the water supply pipe, and the water tank. The clean medium filtered by the external sludge storage tank is pressurized and returned to the water tank by the water pump, improving the medium's recycling rate, reducing the amount of fresh medium replenishment, and significantly reducing consumable costs and environmental pressure. Attached Figure Description

[0023] Figure 1 This is a perspective view of an embodiment of this application; Figure 2 This is a perspective cross-sectional view of an embodiment of this application; Figure 3 This is a perspective cross-sectional view of the negative pressure recovery box according to an embodiment of this application; Figure 4 This is an embodiment of the present application. Figure 3 Enlarged view of point A; Figure 5 This is a three-dimensional cross-sectional view of the external sludge storage tank in an embodiment of this application.

[0024] Legend: 1. Water tank; 2. Negative pressure recovery tank; 3. Telescopic negative pressure suction pipe; 4. Suction hood; 5. Water supply pipe; 6. Valve; 7. Second pipe; 8. First rotating shaft; 9. Sealing cover; 10. External sewage storage tank; 11. Pumping pipe; 12. Pumping pump; 13. Delivery pipe; 14. Negative pressure pump; 15. First pipe; 16. Opening; 17. Second rotating shaft; 18. First filter screen; 19. Handle; 20. Second filter screen; 21. First mounting frame; 22. Second mounting frame; 23. Activated carbon filter layer. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0026] Please see Figures 1-5 This embodiment provides a spiral propulsion pig for natural gas pipelines, the specific concept of which is as follows: A spiral propulsion pig for a natural gas pipeline includes a water tank 1. The spiral propulsion pig for the natural gas pipeline also includes: a negative pressure recovery tank 2, multiple telescopic negative pressure suction pipes 3, multiple suction hoods 4, multiple first filters 18, two first rotating shafts 8, two second rotating shafts 17, an external sludge storage tank 10, and filter elements.

[0027] The negative pressure recovery box 2 is fixedly installed at one end of the water tank 1, and the two form a coaxial integrated structure.

[0028] In addition, multiple telescopic negative pressure suction pipes 3 are evenly distributed along the circumference of the outer peripheral wall of the negative pressure recovery box 2. The fixed end of each telescopic negative pressure suction pipe 3 is sealed to the side wall of the negative pressure recovery box 2 and its inner cavity is connected to the inner cavity of the negative pressure recovery box 2.

[0029] In addition, each telescopic negative pressure suction pipe 3 has a first filter screen 18 built into one end near the negative pressure recovery box 2 for preliminary filtration of sucked-in impurities.

[0030] The movable end of the telescopic negative pressure suction pipe 3 is respectively equipped with a suction hood 4. The opening 16 end of the suction hood 4 faces away from the negative pressure recovery box 2, and the inner cavity of the suction hood 4 is connected to the inner cavity of the telescopic negative pressure suction pipe 3 to form a negative pressure suction channel.

[0031] In addition, two first rotating shafts 8 are rotatably connected to the center points of the two side walls of the water tank 1. The axes of the two first rotating shafts 8 are collinear and perpendicular to the axis of the water tank 1. In addition, a second rotating shaft 17 is rotatably connected above each of the first rotating shafts 8, and the second rotating shaft 17 and the corresponding first rotating shaft 8 form a linkage structure that can rotate relative to each other.

[0032] Among them, an external sludge storage tank 10 is installed at the end of water tank 1 that is away from negative pressure recovery tank 2.

[0033] In addition, the external sludge storage tank 10 is equipped with a filter.

[0034] As examples, in this embodiment, the filter element includes: a first mounting frame 21, a second filter screen 20, a second mounting frame 22, an activated carbon filter layer 23, and two third filters.

[0035] The first mounting frame 21 is fixedly embedded in the top of the inner cavity of the external sludge tank 10, and a second filter screen 20 is fixedly installed inside it.

[0036] In addition, the second mounting frame 22 is fixedly embedded in the bottom of the inner cavity of the external sludge tank 10 and located directly below the first mounting frame 21. An activated carbon filter layer 23 is provided in the middle. The top and bottom of the activated carbon filter layer 23 are covered with a third filter screen. The edges of the two third filter screens are fixedly connected to the inner wall of the second mounting frame 22 to form an encapsulation structure for the activated carbon filter layer 23.

[0037] In this embodiment, when the negative pressure pump 14 inside the water tank 1 is working, it establishes a negative pressure field in the negative pressure recovery tank 2 through the first pipe 15. This negative pressure is transmitted to the suction hood 4 through the annularly distributed telescopic negative pressure suction pipe 3. Due to the negative pressure, the suction hood 4 fits tightly against the inner wall of the pipe, using the air pressure difference to suck the dirt attached to the pipe wall into the suction channel. The telescopic nature of the telescopic negative pressure suction pipe 3 ensures that the negative pressure conduction efficiency is maintained in pipes of different diameters. The built-in first filter screen 18 achieves preliminary separation of large particles of impurities through pore size interception, avoiding blockage of the negative pressure pump 14 and the pipeline. After preliminary filtration... The mixture of dirt and grime flows through the negative pressure recovery box 2 and the second pipe 7 into the external sludge storage tank 10. It undergoes gradient purification through the filter elements. The second filter screen 20 in the first mounting frame 21 at the top intercepts medium-sized particulate impurities, forming a secondary filtration barrier. In the second mounting frame 22 at the bottom, the activated carbon filter layer 23 removes oil and colloidal particles from the mixture through its porous adsorption characteristics. The third filter screen covering it above and below prevents the loss of activated carbon particles and further intercepts small impurities, achieving deep purification. The purified medium settles to the bottom of the external sludge storage tank 10 due to gravity, making it suitable for recycling. Example

[0038] Please see Figures 1-5 Based on Example 1, this example provides a spiral propulsion pig for natural gas pipelines, the specific concept of which is as follows: The spiral propulsion pig for a natural gas pipeline also includes: a negative pressure pump 14, a first pipeline 15, a second pipeline 7, a water delivery pipe 5, a valve 6, an opening 16, a sealing cap 9, two handles 19, a water pump 12, a water delivery pipe 11, and a transmission pipe 13.

[0039] The water tank 1 has a negative pressure pump 14 fixedly installed in its inner cavity. The input end of the negative pressure pump 14 is connected to a first pipe 15. The end of the first pipe 15 away from the negative pressure pump 14 passes through the axis of one of the first rotating shafts 8 and extends to the inner cavity of the negative pressure recovery box 2, so as to realize the connection between the negative pressure pump 14 and the negative pressure recovery box 2.

[0040] In addition, the output end of the negative pressure pump 14 is connected to a second pipe 7, which extends through another second rotating shaft 17 to the inner cavity of the external sludge tank 10, and its end is located near the top of the external sludge tank 10, thereby realizing the connection between the negative pressure pump 14 and the external sludge tank 10.

[0041] In addition, a water supply pipe 5 is fixedly installed on the top of the water tank 1, and the bottom end of the water supply pipe 5 is connected to the inner cavity of the water tank 1. A valve 6 for controlling the on and off of the pipe is provided on the pipe.

[0042] The negative pressure recovery box 2 has an opening 16 on one side wall near the water tank 1, which corresponds to the inner cavity end opening 16 of the water tank 1.

[0043] In addition, the top of the external sludge storage tank 10 is provided with a sealing cover 9, which is opened and closed by sliding cooperation with the top of the external sludge storage tank 10 via a slide rail.

[0044] Two handles 19 are symmetrically fixed to the top of the sealing cover 9, which facilitates the opening and closing of the sealing cover 9.

[0045] In addition, a water pump 12 is fixedly installed on one side wall of the external sludge storage tank 10. The input end of the water pump 12 is connected to a water pumping pipe 11. The end of the water pumping pipe 11 away from the water pump 12 passes through the side wall of the external sludge storage tank 10 and extends to the bottom of its inner cavity. The output end of the water pump 12 is connected to a delivery pipe 13. The delivery pipe 13 can be connected to a water supply pipe 5 to form a circulation path.

[0046] In this embodiment, the negative pressure pump 14 inside the water tank 1 provides a power source for transporting dirt. Its input end forms a closed passage with the negative pressure recovery tank 2 through the first pipe 15. The design of the first pipe 15 passing through the axis of the first rotating shaft 8 avoids the pulling damage to the pipeline caused by the rotation of the shaft and ensures that the negative pressure is stably transmitted to the negative pressure recovery tank 2 along a fixed path. After the negative pressure pump 14 is started, a low-pressure zone is formed in the negative pressure recovery tank 2. An air pressure difference is formed with the outside through the side wall opening 16 of the negative pressure recovery tank 2, driving the dirt in the pipeline to enter the negative pressure recovery tank 2 through the suction hood 4 and the telescopic negative pressure suction pipe 3. At the same time, the output end of the negative pressure pump 14 transports the mixture containing dirt to the external storage tank 10 through the second pipe 7. The second pipe 7 passes through the second rotating shaft 17 and its end is placed on the top of the external storage tank 10.

[0047] Working principle: The negative pressure pump 14 inside the water tank 1 is started. The negative pressure is transmitted to the negative pressure recovery tank 2 through the first pipe 15. After the negative pressure is generated in the negative pressure recovery tank 2, the telescopic negative pressure suction pipes 3 distributed in a ring on its outer surface simultaneously form suction. The suction hood 4 fits against the inner wall of the pipe and sucks in the dirt (such as rust, oil, and water mixture) in the pipe. The telescopic negative pressure suction pipe 3 can automatically extend and retract according to the inner diameter of the pipe to ensure that the suction hood 4 always fits against the pipe wall and ensures the suction efficiency. The dirt enters the telescopic negative pressure suction pipe 3 through the suction hood 4 and is first filtered through the first filter screen 18 in the pipe to intercept large particles of impurities and prevent blockage of subsequent pipes. The dirt is transported and deeply filtered. The dirt mixture after the initial filtration flows into the negative pressure recovery tank 2 and enters the first pipe 15 through the opening 16 on the side of the negative pressure recovery tank 2 near the water tank 1. Driven by the negative pressure pump 14, it is transported along the second pipe 7 to the external storage tank 10.

[0048] The mixture first passes through the first mounting frame 21 at the top of the external sludge storage tank 10, and then through the second filter screen 20 to filter out medium-sized particulate impurities. The remaining mixture falls to the second mounting frame 22 at the bottom, passes through the third filter screen at the top, and enters the activated carbon filter layer 23 to adsorb oil and fine dust. Finally, it passes through the third filter screen at the bottom to complete deep purification. The purified medium is stored at the bottom of the external sludge storage tank 10. The medium is recycled by starting the water pump 12 on one side of the external sludge storage tank 10. The pump 12 draws the purified medium from the bottom of the external sludge storage tank 10 through the water pipe 11 and pumps it into the water supply pipe 5 through the delivery pipe 13. The valve 6 on the water supply pipe 5 is opened, and the purified medium flows back to the water tank 1, realizing the recycling of the cleaning medium and reducing the consumption of consumables. The negative pressure pump 14 and the water pump 12 are turned off, the connection between the delivery pipe 13 and the water supply pipe 5 is disconnected, the sealing cover 9 is opened through the handle 19, the first mounting frame 21 and the second mounting frame 22 are taken out, and the impurities trapped by the filter screen and the activated carbon filter layer 23 are cleaned.

[0049] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0050] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A spiral propulsion pig for a natural gas pipeline, comprising a water tank (1), characterized in that, The spiral propulsion pig for this natural gas pipeline also includes: A negative pressure recovery box (2) is installed at one end of the water tank (1); Multiple telescopic negative pressure suction pipes (3) are installed on the outer surface of the negative pressure recovery box (2). The multiple telescopic negative pressure suction pipes (3) are arranged in a ring and are connected to the inner cavity of the negative pressure recovery box (2). Multiple suction hoods (4) are installed at the end of the telescopic negative pressure suction pipe (3) away from the negative pressure recovery box (2), and the multiple suction hoods (4) are connected to the telescopic negative pressure suction pipe (3); Multiple first filters (18) are all located at one end of the telescopic negative pressure suction pipe (3) near the negative pressure recovery box (2); Two first rotating shafts (8) are rotatably installed at the center points on both sides of the water tank (1); Two second rotating shafts (17) are rotatably mounted above two first rotating shafts (8); An external sludge storage tank (10) is installed at one end of the water tank (1); The filter element is installed inside the external sludge storage tank (10).

2. The spiral propulsion pig for a natural gas pipeline according to claim 1, characterized in that, The filter element includes: The first mounting frame (21) is installed on the top of the inner cavity of the external sludge storage tank (10); The second filter (20) is disposed inside the first mounting frame (21); The second mounting frame (22) is installed at the bottom of the inner cavity of the external sludge storage tank (10), and the second mounting frame (22) is located at the bottom of the first mounting frame (21); An activated carbon filter layer (23) is disposed in the middle of the second mounting frame (22); Two third filters, located at the top and bottom of the second mounting frame (22), enclose the activated carbon filter layer (23).

3. A spiral propulsion pig for a natural gas pipeline according to claim 1, characterized in that, The spiral propulsion pig for this natural gas pipeline also includes: A negative pressure pump (14) is installed inside the water tank (1); The first pipe (15) is connected to one end of the negative pressure pump (14), the first pipe (15) passes through one of the first rotating shafts (8), and the first pipe (15) is connected to the inside of the negative pressure recovery box (2); The second pipe (7) is connected to the other end of the negative pressure pump (14). The second pipe (7) passes through another second rotating shaft (17) and the external sludge tank (10). The second pipe (7) is located at the top of one side of the external sludge tank (10). The second pipe (7) is connected to the inside of the external sludge tank (10).

4. A spiral propulsion pig for a natural gas pipeline according to claim 1, characterized in that, The spiral propulsion pig for this natural gas pipeline also includes: A water supply pipe (5) is installed on the top of the water tank (1), and the water supply pipe (5) is connected to the inside of the water tank (1); A valve (6) is installed on the water supply pipe (5).

5. A spiral propulsion pig for a natural gas pipeline according to claim 1, characterized in that, The spiral propulsion pig for this natural gas pipeline also includes: A water pump (12) is installed on one side of the external sludge storage tank (10); A water pumping pipe (11) is connected to the bottom end of the water pump (12). The water pumping pipe (11) passes through one side of the external sludge storage tank (10) and is connected to the inner cavity of the external sludge storage tank (10). A delivery pipe (13) is installed at the top of the water pump (12), and the delivery pipe (13) can be connected to the top of the water delivery pipe (5).

6. A spiral propulsion pig for a natural gas pipeline according to claim 1, characterized in that, The spiral propulsion pig for this natural gas pipeline also includes: A sealing cap (9) is installed on the top of the external sludge storage tank (10), and the sealing cap (9) slides in fit with the top of the external sludge storage tank (10).

7. A spiral propulsion pig for a natural gas pipeline according to claim 6, characterized in that, The spiral propulsion pig for this natural gas pipeline also includes: Two handles (19) are fixedly installed on the top of the sealing cover (9), and the two handles (19) are arranged symmetrically.

8. A spiral propulsion pig for a natural gas pipeline according to claim 1, characterized in that, The spiral propulsion pig for this natural gas pipeline also includes: An opening (16) is provided on the side of the negative pressure recovery box (2) near the water tank (1).

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