A natural gas pipeline leakage point detection device

Abstract

The utility model discloses a natural gas pipeline leakage point detection device relates to natural gas technical field, including detection platform and setting in the pipeline sleeve no.

Description

Technical Field

[0001] This utility model relates to the field of natural gas technology, specifically to a natural gas pipeline leak detection device. Background Technology

[0002] Small-diameter natural gas pipelines are widely used in urban household branch lines, industrial and commercial small user connections, and rural "coal-to-gas" projects. The pipe diameter is mostly 20-110 mm. They are characterized by dense branching, complex laying environments (such as buried through courtyards, laid along walls, etc.), and proximity to areas with people's activities.

[0003] Currently, these types of pipelines require sampling inspection during production. Natural gas pipeline leaks not only waste natural gas but also pose a significant risk of explosions, poisoning, and other safety accidents, threatening public safety. Existing inspection equipment for large-diameter pipelines is bulky, costly, and lacks adaptability. Therefore, there is a need for a leak detection device for small-diameter natural gas pipelines used in factory production. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a natural gas pipeline leak detection device to solve the current problem that, while sampling inspections are required during the production process of such pipelines, natural gas pipeline leaks not only waste natural gas but also easily lead to safety accidents such as explosions and poisoning, threatening public safety. Existing detection equipment for large-diameter pipelines suffers from technical problems such as large size, high cost, and insufficient adaptability.

[0005] To achieve the above objectives, this utility model employs the following technical solution: A natural gas pipeline leak detection device includes a detection platform, and two pipe sleeves, a first pipe sleeve and a second pipe sleeve, fixed to one side of the top of the detection platform. The first pipe sleeve is slidably disposed on the other side of the top of the detection platform and can be adjusted to a suitable connection position according to the length of the natural gas pipeline. A pipe collar is disposed in the middle of the first pipe sleeve and the second pipe sleeve. The natural gas pipeline is installed in the middle of the first pipe sleeve and the second pipe sleeve. The pipe collar slides back and forth in the middle of the first pipe sleeve and the second pipe sleeve, and sprays soapy water onto the outer wall of the natural gas pipeline. By observing whether bubbles are generated on the surface of the natural gas pipeline after spraying soapy water, if bubbles are generated at a certain position on the surface of the natural gas pipeline, it is confirmed that there is a leak at that position. If no bubbles are generated at any position on the surface of the natural gas pipeline, it is confirmed that there is no leak on the surface of the natural gas pipeline.

[0006] As a preferred technical solution of this utility model, the second pipe sleeve includes: a gas supply pump, fixedly installed on the side wall of the testing platform; a gas supply pipe, one end of which is connected to the gas supply pump, and the other end of which is connected to the second pipe sleeve. The inner wall of the second pipe sleeve is sealed to the top of the natural gas pipeline. The gas supply pump is an existing product. The two ends of the natural gas pipeline are sealed and connected by the first and second pipe sleeves. The gas supply pump injects gas pressure from one end of the natural gas pipeline through the gas supply pipe and maintains the pressure, which facilitates observation of whether there is gas leakage on the surface of the natural gas pipeline.

[0007] The inner wall of pipe sleeve one is equipped with a sealing rubber sheet, and pipe sleeve two is equipped with a sealing rubber gasket. Pipe sleeve two is connected to the air supply pipe, and the airflow and pressure maintenance are controlled by the air supply pump.

[0008] As a preferred embodiment of this utility model, the pipe collar includes several spray nozzles disposed on its inner wall. The pipe collar is configured as a circular ring structure, and its inner wall has a total of eight spray nozzles. Three spray nozzles are disposed on the top surface and three on the bottom surface of the inner wall of the pipe collar. This allows for the spraying of a larger amount of soap solution from the upper and lower ends of the natural gas pipeline surface, where soap is less likely to adhere, thus facilitating the even application of soap solution to the natural gas pipeline surface. One spray nozzle is disposed on the left side and one on the right side of the inner wall of the pipe collar. The eight spray nozzles are interconnected inside the pipe collar, enabling synchronous spraying of soap solution. Driven by a threaded screw, the pipe collar reciprocates by spraying soap solution along the surface of the natural gas pipeline.

[0009] As a preferred technical solution of this utility model, the pipe collar includes a threaded sleeve slider that is slidably connected, the threaded sleeve slider being slidably installed on the top of the testing platform; and a liquid supply tank being fixedly installed on the top of the threaded sleeve slider. The infusion tube has one end connected to the supply tank and the other end connected to the pipe collar. The liquid supply tank contains soap solution, and a liquid pump is installed inside the liquid supply tank. The soap solution inside the liquid supply tank is transported to the pipeline ring through the liquid pump and the liquid supply pipe. It is then evenly sprayed onto the surface of the natural gas pipeline through the spray nozzles that are interconnected on the inner wall of the pipeline ring.

[0010] In a preferred embodiment of this invention, the threaded sleeve slider includes a threaded screw rotatably connected to the top of the testing platform. The threaded sleeve slider is threadedly connected to the surface of the threaded screw, and one end of the threaded screw is connected to a servo motor, which is fixedly mounted on the top of the testing platform. This facilitates driving the threaded screw to rotate, causing it to reciprocate at the top of the testing platform. The threaded sleeve slider then drives the liquid supply tank, infusion pipe, and pipe collar to reciprocately spray soap solution along the surface of the natural gas pipeline.

[0011] In a preferred embodiment of this invention, a guide groove is provided at the top of the testing platform, located below the threaded screw. A guide rod is provided at the bottom of the threaded sleeve slider, and the guide rod is slidably connected within the guide groove. This enables the threaded sleeve slider to slide stably at the top of the testing platform.

[0012] As a preferred embodiment of this utility model, the pipe collar further includes: a flow-gathering port located at the top of the testing platform; and flow-guiding slopes symmetrically arranged on both sides of the flow-gathering port. The flow-guiding slopes effectively collect soap liquid dripping from the surface of the pipe collar and the surface of the natural gas pipeline. Specifically, the flow-guiding slopes at the top of the testing platform form a sloping surface, facilitating the flow of dripping soap liquid towards the center. The width of the two sides of the flow-guiding slopes is greater than the outer diameter of the pipe collar, effectively collecting soap liquid dripping from the surface of the pipe collar while effectively preventing soap liquid from seeping to other locations on the top surface of the testing platform.

[0013] As a preferred technical solution of this utility model, the flow collection port includes: a liquid storage box, placed below the flow collection port, to collect the soap liquid dripping from the flow collection port and reduce pollution to the surrounding environment of the testing station.

[0014] As a preferred technical solution of this utility model, the bottom of the testing platform is provided with a support leg, and the middle of the support leg is provided with a support platform. The liquid storage box is placed on the support platform, which facilitates the removal and placement of the liquid storage box.

[0015] This invention utilizes a testing platform, a first pipe sleeve, a second pipe sleeve, and a pipe collar. The natural gas pipeline is installed between the first and second pipe sleeves. The pipe collar slides back and forth between the first and second pipe sleeves, and soapy water is sprayed onto the outer wall of the natural gas pipeline. By observing whether bubbles are generated on the surface of the natural gas pipeline after spraying soapy water, if bubbles are present at a certain location on the surface of the natural gas pipeline, it indicates that there is a leak at that location. If no bubbles are generated at any location on the surface of the natural gas pipeline, it indicates that there is no leak on the surface of the natural gas pipeline.

[0016] The two ends of the natural gas pipeline are sealed by pipe sleeve one and pipe sleeve two. A gas supply pump is used to inject gas pressure from one end of the natural gas pipeline through the gas supply pipeline and maintain the pressure, so as to facilitate the observation of whether there is any gas leakage on the surface of the natural gas pipeline.

[0017] Eight spray nozzles are provided on the inner wall of the pipe collar, with three nozzles on the top and three on the bottom of the inner wall. This allows for the spraying of a larger amount of soap solution from the upper and lower ends of the natural gas pipeline surface, where soap is less likely to adhere, thus ensuring even application of the soap solution. One spray nozzle is also provided on the left and right sides of the inner wall of the pipe collar. These eight nozzles are interconnected within the pipe collar, enabling synchronized soap spraying. Driven by a threaded screw, the pipe collar reciprocates along the surface of the natural gas pipeline, spraying soap solution repeatedly.

[0018] This invention utilizes a liquid supply tank that stores soap solution and is equipped with a liquid pump. The soap solution inside the supply tank is transported through the liquid pump and a liquid delivery pipe into the pipeline collar, and then evenly sprayed onto the surface of the natural gas pipeline through spray nozzles that are interconnected on the inner wall of the pipeline collar.

[0019] This invention utilizes symmetrically arranged guide slopes on both sides of the flow-collecting inlet; these slopes effectively collect soap dripping from the surface of the pipe collar and the natural gas pipeline. Specifically, the guide slopes form a sloping surface at the top of the testing platform, facilitating the flow of dripping soap towards the center. The width of the two sides of the guide slopes is greater than the outer diameter of the pipe collar, effectively collecting soap dripping from the pipe collar surface while simultaneously preventing soap from seeping to other parts of the testing platform's top surface.

[0020] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0021] Figure 1 This is a front view schematic diagram of the natural gas pipeline leak detection device of this utility model. Figure 1 ; Figure 2 This is a top view of the natural gas pipeline leak detection device of this utility model. Figure 2 ; Figure 3 This is a left-side partial structural schematic diagram of the natural gas pipeline leak detection device of this utility model; In the diagram: 1. Testing platform; 2. Support leg; 3. Support platform; 4. Liquid storage box; 5. Servo motor; 6. Movable stop; 7. Pipe sleeve one; 8. Natural gas pipeline; 10. Pipe collar; 11. Infusion pipe; 12. Pipe sleeve two; 13. Gas supply pipeline; 14. Gas supply pump; 15. Threaded sleeve slider; 16. Threaded screw; 17. Converging port; 18. Guide straight groove; 19. Liquid supply tank; 20. Guide slope; 23. Guide rod; 24. Injection port. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable. Example 1

[0027] Please see Figure 1-3The present invention provides a technical solution as follows: To achieve the above objectives, the present invention is implemented through the following technical solution: A natural gas pipeline leak detection device includes a detection platform 1, and two pipe sleeves 7 and 12 fixed to one side of the top of the detection platform 1. Pipe sleeve 7 is slidably disposed on the other side of the top of the detection platform 1 and can be adjusted to a suitable connection position according to the length of the natural gas pipeline. A pipe collar 10 is disposed in the middle of pipe sleeve 7 and pipe sleeve 12. The natural gas pipeline 8 is installed in the middle of pipe sleeve 7 and pipe sleeve 12. The pipe collar 10 slides back and forth in the middle of pipe sleeve 7 and pipe sleeve 12 and sprays soap solution onto the outer wall of the natural gas pipeline 8. The device observes whether bubbles are generated on the surface of the natural gas pipeline by spraying soap solution. If bubbles are generated at a certain position on the surface of the natural gas pipeline, it indicates that there is a leak at that position. If no bubbles are generated at any position on the surface of the natural gas pipeline, it indicates that there is no leak on the surface of the natural gas pipeline.

[0028] Specifically, in this embodiment, the second pipe sleeve 12 includes: a gas supply pump 14, which is fixedly installed on the side wall of the test platform 1; a gas supply pipe 13, one end of which is connected to the gas supply pump 14, and the other end of which is connected to the second pipe sleeve 12. The inner wall of the second pipe sleeve 12 is connected and sealed to the top end of the natural gas pipe 8. The gas supply pump 14 is an existing product. The two ends of the natural gas pipe are sealed and connected through the first pipe sleeve 7 and the second pipe sleeve 12. The gas supply pump 14 injects gas pressure from one end of the natural gas pipe through the gas supply pipe 13 and maintains the pressure, which facilitates the observation of whether there is gas leakage on the surface of the natural gas pipe.

[0029] The inner wall of pipe sleeve 17 is provided with a sealing rubber sheet, and pipe sleeve 212 is provided with a sealing rubber gasket. Pipe sleeve 212 is connected to the air supply pipe 13, and the airflow is controlled and pressure is maintained by the air supply pump 14.

[0030] Specifically, in this embodiment, the pipe collar 10 includes several spray nozzles 24 disposed on its inner wall. The pipe collar 10 is configured as a circular ring structure, with a total of eight spray nozzles 24 disposed on its inner wall. Three spray nozzles 24 are disposed on the top surface and three on the bottom surface of the inner wall of the pipe collar 10. This allows for the spraying of a greater amount of soap solution from the upper and lower ends of the natural gas pipeline surface, where it is difficult for soap solution to adhere, thus facilitating the even application of soap solution to the surface of the natural gas pipeline. One spray nozzle 24 is disposed on the left side and one on the right side of the inner wall of the pipe collar 10. The eight spray nozzles 24 are interconnected inside the pipe collar 10, enabling synchronous spraying of soap solution. Driven by a threaded screw, the pipe collar 10 reciprocates by spraying soap solution along the surface of the natural gas pipeline.

[0031] Specifically, in this embodiment, the pipe collar 10 includes a threaded sleeve slider 15 that is slidably connected, the threaded sleeve slider 15 being slidably mounted on the top of the testing platform 1; and a liquid supply tank 19 being fixedly mounted on the top of the threaded sleeve slider 15. An infusion tube 11 is provided, with one end connected to the supply tank 19 and the other end connected to the pipe collar 10. The liquid supply tank 19 contains soap solution and is equipped with a liquid pump. The soap solution inside the liquid supply tank 19 is transported to the pipe collar 10 through the liquid pump and the liquid pipe 11. It is then evenly sprayed onto the surface of the natural gas pipeline 8 through the spray nozzles 24 that are interconnected on the inner wall of the pipe collar 10.

[0032] Specifically, in this embodiment, the threaded sleeve slider 15 includes a threaded screw 16 rotatably connected to the top of the testing platform 1. The threaded sleeve slider 15 is threadedly connected to the surface of the threaded screw 16, and one end of the threaded screw 16 is connected to a servo motor 5, which is fixedly installed on the top of the testing platform 1. This facilitates driving the threaded screw 16 to rotate, and the threaded screw 16 drives the threaded sleeve slider 15 to reciprocate at the top of the testing platform 1. The threaded sleeve slider 15 drives the liquid supply tank 19, the liquid delivery pipe 11, and the pipe collar 10 to reciprocately spray soap solution along the surface of the natural gas pipeline.

[0033] Specifically, in this embodiment, a guide groove 18 is provided at the top of the testing platform 1. The guide groove 18 is located below the threaded screw 16 at the top of the testing platform 1. A guide rod 23 is provided at the bottom of the threaded sleeve slider 15, and the guide rod 23 is slidably connected in the guide groove 18. This enables the threaded sleeve slider 15 to slide stably at the top of the testing platform 1.

[0034] Specifically, in this embodiment, the pipe collar 10 further includes: a flow-gathering port 17, located at the top of the testing platform 1; and flow-guiding slopes 20, symmetrically arranged on both sides of the flow-gathering port 17. The flow-guiding slopes 20 can effectively collect soap liquid dripping from the surface of the pipe collar 10 and the surface of the natural gas pipeline. The flow-guiding slopes 20 are sloping at the top of the testing platform 1, facilitating the convergence of dripping soap liquid towards the center. The width of the two sides of the flow-guiding slopes 20 is greater than the outer diameter of the pipe collar 10, effectively collecting the soap liquid dripping from the surface of the pipe collar 10 while effectively preventing the soap liquid from seeping to other locations on the top surface of the testing platform 1.

[0035] Specifically, in this embodiment, the collection port 17 includes a liquid storage box 4, which is placed below the collection port 17 to collect the soap liquid dripping from the collection port 17.

[0036] Specifically, in this embodiment, the bottom of the detection platform 1 is provided with a support leg 2 for support, and a support platform 3 is provided in the middle of the support leg 2. The liquid storage box 4 is placed on the support platform 3 to facilitate the removal and placement of the liquid storage box 4.

[0037] Example 2 Please see Figure 1-3 This is another technical solution provided by the present invention. This embodiment has the same features as the above embodiment 1, and the similarities will not be described in this embodiment. The specific differences are as follows: A natural gas pipeline leak detection device includes a detection platform 1, and two pipe sleeves 12 and 12, which are fixed to one side of the top of the detection platform 1. Pipe sleeve 17 is slidably disposed on the other side of the top of the detection platform 1 and can be adjusted to a suitable connection position according to the length of the natural gas pipeline. A pipe collar 10 is disposed in the middle of pipe sleeve 17 and pipe sleeve 12. The natural gas pipeline 8 is installed in the middle of pipe sleeve 17 and pipe sleeve 12. The pipe collar 10 slides back and forth in the middle of pipe sleeve 17 and pipe sleeve 12 and sprays soap solution onto the outer wall of the natural gas pipeline 8. The device observes whether bubbles are generated on the surface of the natural gas pipeline by spraying soap solution. If bubbles are generated at a certain position on the surface of the natural gas pipeline, it indicates that there is a leak at that position. If no bubbles are generated at any position on the surface of the natural gas pipeline, it indicates that there is no leak on the surface of the natural gas pipeline.

[0038] The working principle is as follows: First, place the natural gas pipeline 8 between the pipeline sleeve 1 7 and the pipeline sleeve 2 12, and push the pipeline sleeve 1 7 to clamp the natural gas pipeline 8. Then, the pipeline sleeve 1 7 is locked to the top surface of the test platform 1 by locking screws. The inner wall of the pipeline sleeve 1 7 is provided with a sealing rubber sheet, and the pipeline sleeve 2 12 is provided with a sealing rubber gasket. The pipeline sleeve 2 12 is connected to the gas supply pipeline 13, and the gas flow and pressure are controlled by the gas supply pump 14.

[0039] Secondly, the pipe collar 10 drives the threaded sleeve slider 15 to reciprocate at the top of the test platform 1 via the threaded screw 16. The threaded sleeve slider 15 drives the liquid supply tank 19, the liquid delivery pipe 11 and the pipe collar 10 to reciprocate spray soap solution along the surface of the natural gas pipeline.

[0040] Finally, soap solution is sprayed onto the outer wall of the natural gas pipeline 8 through eight spray nozzles 24 on the inner wall of the pipeline collar 10. The surface of the natural gas pipeline is observed to see if bubbles are generated by spraying soap solution. If bubbles are generated at a certain position on the surface of the natural gas pipeline, it proves that there is a leak at that position. If no bubbles are generated at any position on the surface of the natural gas pipeline, it indicates that there is no leak on the surface of the natural gas pipeline.

[0041] In this embodiment, the electronic components such as the liquid supply tank 19, the infusion pump, and the air supply pump 14 are all prior art and will not be described in detail in this embodiment. Any such electronic component in the prior art that can achieve the technical effect described in this application specification can be used as a replacement for the electronic component in this application.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A natural gas pipeline leak detection device, comprising a detection platform (1), and a pipeline sleeve one (7) and a pipeline sleeve two (12) disposed on the top of the detection platform (1), characterized in that: Pipe sleeve two (12) is fixed to one side of the top of the test bench (1); Pipe sleeve 1 (7) is slidably set on the other side of the top of the test bench (1); Pipe sleeve (10) is located at the middle position between pipe sleeve one (7) and pipe sleeve two (12); The natural gas pipeline (8) is installed in the middle of the pipeline sleeve one (7) and the pipeline sleeve two (12). The pipeline collar (10) slides back and forth in the middle of the pipeline sleeve one (7) and the pipeline sleeve two (12) and sprays soap liquid on the outer wall of the natural gas pipeline (8).

2. The natural gas pipeline leak detection device according to claim 1, characterized in that, The pipe sleeve two (12) includes: An air supply pump (14) is fixedly installed on the side wall of the testing platform (1); Gas supply pipe (13), one end of which is connected to gas supply pump (14), and the other end of which is connected to pipe sleeve two (12).

3. The natural gas pipeline leak detection device according to claim 1, characterized in that, The pipe collar (10) includes a plurality of spray nozzles (24) disposed on the inner wall. The pipe collar (10) is configured as a circular ring structure. The inner wall of the pipe collar (10) is provided with a total of eight spray nozzles (24). The top surface of the inner wall of the pipe collar (10) and the bottom surface of the inner wall of the pipe collar (10) are each provided with three spray nozzles (24). The left side of the inner wall of the pipe collar (10) and the right side of the inner wall of the pipe collar (10) are each provided with one spray nozzle (24). The eight spray nozzles (24) are interconnected inside the pipe collar (10).

4. A natural gas pipeline leak detection device according to claim 3, characterized in that: The pipe collar (10) includes a threaded sleeve slider (15) that is slidably connected. The threaded sleeve slider (15) is slidably mounted on the top of the testing table (1); The liquid supply tank (19) is fixedly installed on the top of the threaded sleeve slider (15); An infusion tube (11) is connected at one end to a supply tank (19) and at the other end to a pipe collar (10). The liquid supply tank (19) contains soap solution. The soap solution inside the liquid supply tank (19) is transported to the pipe collar (10) through the liquid delivery pipe (11) and evenly sprayed onto the surface of the natural gas pipeline (8) through the spray nozzles (24) that are interconnected on the inner wall of the pipe collar (10).

5. A natural gas pipeline leak detection device according to claim 4, characterized in that, The threaded sleeve slider (15) includes a threaded screw (16) rotatably connected to the top of the test bench (1). The threaded sleeve slider (15) is threadedly connected to the surface of the threaded screw (16). One end of the threaded screw (16) is connected to a servo motor (5). The servo motor (5) is fixedly installed on the top of the test bench (1).

6. A natural gas pipeline leak detection device according to claim 5, characterized in that: The top of the testing platform (1) is provided with a guide groove (18), which is located below the threaded screw (16) at the top of the testing platform (1). The bottom of the threaded sleeve slider (15) is provided with a guide rod (23), which is slidably connected in the guide groove (18).

7. A natural gas pipeline leak detection device according to claim 4, characterized in that, The pipe collar (10) also includes: The flow inlet (17) is located at the top of the testing station (1); The guide slope (20) is symmetrically arranged on both sides of the flow convergence port (17); Among them, the guide slope (20) is a sloping slope at the top of the test platform (1), and the width of the two sides of the guide slope (20) is greater than the outer wall diameter of the pipe collar (10).

8. A natural gas pipeline leak detection device according to claim 7, characterized in that, The flow collection port (17) includes: The liquid collection box (4) is placed below the collection port (17) to collect the drops from the collection port (17). The soap liquid that fell.

9. A natural gas pipeline leak detection device according to claim 8, characterized in that, The bottom of the testing platform (1) is supported by a support leg (2), and a support platform (3) is provided in the middle of the support leg (2). The liquid storage box (4) is placed on top of the support platform (3).

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