A gas detection device
By introducing structures such as spray tanks, rotating shafts, scrapers, and extrusion cylinders into the gas filtration device, the problem of easy clogging of filter components is solved, achieving efficient gas purification and automatic impurity removal, and improving the adaptability and stability of the device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DALIAN BAFANG FLUID TECH CO LTD
- Filing Date
- 2025-09-01
- Publication Date
- 2026-07-31
AI Technical Summary
Existing gas filtration devices are easily clogged by impurities, resulting in poor gas flow, reduced filtration efficiency, and poor adaptability to gases of different properties. In particular, high-temperature and corrosive gases can easily damage the device components.
A structure including a spray tank, a rotating shaft, a scraper, an arc-shaped filter screen, and a squeezing cylinder is designed. The rotating shaft is driven by a drive motor, the scraper cleans the water membrane, the arc-shaped filter screen filters impurities, and the squeezing cylinder discharges impurities. By combining a multi-layer filter screen and a spray system, efficient gas purification and automatic impurity removal are achieved.
It improves gas filtration efficiency and stability, enhances adaptability to gases with different properties, and reduces equipment maintenance costs and energy consumption.
Smart Images
Figure CN224573473U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of gas filtration equipment, specifically a gas filtration detection device. Background Technology
[0002] Specialty gases have wide applications in many fields such as semiconductor manufacturing, medical, and aerospace. Their purity and quality are crucial to the performance and safety of related products. Gas filtration devices are key equipment for ensuring the quality of specialty gases.
[0003] A typical gas filtration device includes a filter assembly, a spray system, and a power drive unit. During operation, the gas to be tested enters the device through the inlet pipe, undergoes preliminary filtration, is further purified by the spray system, and finally passes through multiple layers of filters for deep filtration before being discharged.
[0004] Existing gas filtration devices have many problems: the filter components are easily clogged by impurities, resulting in poor gas flow, significantly reduced filtration efficiency, and poor adaptability to gases of different properties, such as high temperature and corrosive gases, which can easily damage the device components. Therefore, a gas filtration device is proposed to address the above problems. Utility Model Content
[0005] To overcome the shortcomings of existing technologies and address the numerous problems of existing gas detection filtration devices mentioned in the background art, such as the filter components being easily clogged by impurities, resulting in poor gas flow, significantly reduced filtration efficiency, and poor adaptability to gases of different properties, such as high temperature and corrosive gases easily damaging device components, this utility model proposes a gas detection filtration device.
[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: A gas detection and filtration device of this utility model includes a filter box. A circular mounting hole is provided at the bottom of the filter box, and a water filter membrane is fixedly installed inside the circular mounting hole. A spray tank is fixedly installed at the bottom of the filter box. A pressure gauge is fixedly installed on the upper exterior of the spray tank. An air inlet pipe is provided below the pressure gauge and fixedly connected to the spray tank. A support plate is fixedly installed inside the upper end of the spray tank. A connecting shaft is rotatably installed in the center of the support plate. Both ends of the connecting shaft pass through the support plate, and a fixing seat is fixedly installed at the upper end. An installation groove is provided in the center of the upper part of the fixing seat, and a scraper is fixedly installed in the installation groove. A spray pipe is provided below the support plate and fixedly installed inside the spray tank. Multiple nozzles are fixedly installed in an array at the bottom of the spray pipe. A rotating shaft is located below the spray nozzle, and a rotating spiral is welded onto the rotating shaft. A slag discharge port is opened on one side of the spray tank, and a squeezing cylinder is fixedly installed outside the slag discharge port. A drive motor is fixedly installed on the other side of the spray tank. One end of the rotating shaft is rotatably installed inside the spray tank, and the other end is rotatably installed inside the squeezing cylinder and passes through the squeezing cylinder. The output shaft of the drive motor is fixedly connected to one end of the rotating shaft. Baffles are provided on both sides of the rotating shaft and fixedly installed inside the spray tank. An arc-shaped filter screen is located directly below the rotating shaft and fixedly installed between the lower ends of the two baffles. The rotating shaft is driven by the drive motor to rotate, and the rotating spiral stirs the gas and liquid mixture, making it difficult for impurities to settle and clog. The scraper can clean impurities on the surface of the filter membrane to prevent clogging. The arc-shaped filter screen further filters the water, and the slag discharge port and squeezing cylinder facilitate the discharge of impurities.
[0007] Preferably, an outlet pipe is fixedly connected to the top of the filter box, and a gas flow control valve is installed inside the outlet pipe. Three rectangular mounting slots are sequentially opened in the vertical direction on one side of the filter box. Molecular sieves, activated carbon layers, and glass fiber layers are slidably installed in the rectangular mounting slots, respectively. The gas flow control valve can precisely adjust the gas flow rate to meet different detection requirements. At the same time, the multi-layer filtration of molecular sieves, activated carbon layers, and glass fiber layers can deeply purify different impurities, improve the adaptability to gases of different properties, and enhance the filtration effect.
[0008] Preferably, a gearbox is fixedly installed at the center of the bottom of the support plate, and a rotating shaft is rotatably installed on one side of the gearbox. One end of the rotating shaft and the lower end of the connecting shaft are both rotatably disposed in the gearbox and fixedly installed with bevel gears. The bevel gears are perpendicular to each other and mesh with each other. Rotating wheels are fixedly installed at the same end of the rotating shaft and the connecting shaft. The rotating wheels rotate with the belt. Through the transmission structure of the gearbox and the belt, the rotating shaft can drive the connecting shaft to rotate when it rotates, thereby causing the scraper to rotate and clean the filter membrane. No additional power source is required, which reduces energy consumption and cost.
[0009] Preferably, sliding holes are provided on both sides of the end face of the outer end of the extrusion cylinder, and a sliding rod is slidably installed in the sliding holes. An extrusion plate is fixedly installed at one end of the sliding rod, and springs are provided on both sides of one end of the extrusion plate and fitted onto the sliding rod. The extrusion plate is slidably installed on the rotating shaft. A discharge pipe is fixedly installed at the bottom of the outer end of the extrusion cylinder, and a sliding groove is provided on one side of the lower end of the discharge pipe. A sealing plate is slidably installed in the sliding groove. By rotating the screw and cooperating with the extrusion plate, impurities can be effectively extruded and dehydrated, thereby improving the efficiency of impurity treatment.
[0010] Preferably, a water pump is fixedly installed above the drive motor outside the spray tank. The water pump outlet is fixedly connected to the spray pipe. A drain pipe is fixedly installed at the bottom of the spray tank. A water intake pipe is fixedly installed on one side of the upper end of the drain pipe. The other end of the water intake pipe is fixedly connected to the water pump inlet. A drain valve is installed inside the lower end of the drain pipe. The water pump enables the recycling of the spray liquid, reducing water consumption. At the same time, the drain valve controls the discharge of liquid in the spray tank, facilitating cleaning and maintenance of the device and reducing maintenance costs.
[0011] Preferably, the drive motor, water pump, gas flow control valve, and pressure gauge are all linearly connected to the PLC controller via power lines, and the PLC controller is used to control their start and stop. The PLC controller enables automated control of the device, and operators can set parameters remotely or on-site according to actual needs to control the operation of each component, thereby improving the intelligence level and ease of operation of the device and reducing manual operation costs.
[0012] The advantages of this utility model are: 1. This utility model, when detecting special gases, involves the gas to be detected entering the spray tank through the inlet pipe. The drive motor is activated, driving a rotating screw via a rotating shaft. Simultaneously, a scraper rotates through a belt and gearbox, cleaning the bottom of the filter membrane. A water pump draws liquid from the bottom of the spray tank through a water pipe, spraying it down through a spray pipe and nozzles to wash and filter the gas. Solid impurities generated during spraying fall onto an arc-shaped filter screen for filtration. The rotating screw pushes the impurities on the arc-shaped filter screen through the slag discharge port into a squeezing cylinder. Under the action of the rotating screw, squeezing plate, and spring, the impurities are squeezed, and after the liquid is discharged, the solid impurities enter the discharge pipe. This structural design achieves efficient gas purification and automatic impurity removal, solving many problems of existing gas filtration devices: filter components are easily clogged by impurities, leading to poor gas flow, significantly reduced filtration efficiency, and poor adaptability to gases of different properties, such as high-temperature and corrosive gases that easily damage device components. This design improves the efficiency and stability of gas filtration. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 This is a schematic diagram of one side of the filter device. Figure 2 This is a schematic diagram of the other side of the filter device; Figure 3 This is a schematic diagram of the internal structure of the filtration device; Figure 4 This is a schematic diagram of the scraper drive mechanism. Figure 5 This is a schematic diagram of a solid particle compression mechanism.
[0015] In the diagram: 1. Filter box; 2. Air outlet pipe; 3. Gas flow control valve; 4. Glass fiber layer; 5. Activated carbon layer; 6. Molecular sieve; 7. Water filter membrane; 8. Spray tank; 9. Support plate; 10. Connecting shaft; 11. Fixed seat; 12. Scraper; 13. Bevel gear; 14. Gearbox; 15. Rotating shaft; 16. Rotating wheel; 17. Belt; 18. Pressure gauge; 19. Air inlet pipe; 20. Water pump; 21. Spray pipe; 22. Nozzle; 23. Baffle; 24. Arc-shaped filter screen; 25. Rotating shaft; 26. Rotating screw; 27. Drive motor; 28. Extrusion cylinder; 29. Extrusion plate; 30. Slide rod; 31. Spring; 32. Discharge pipe; 33. Sealing plate; 34. Drain pipe; 35. Water intake pipe; 36. Drain valve. Detailed Implementation
[0016] 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 scope of protection of the present utility model.
[0017] Please see Figure 1-5As shown, a gas filtration device includes a filter box 1. A circular mounting hole is provided at the bottom of the filter box 1, and a water filter membrane 7 is fixedly installed inside the circular mounting hole. A spray tank 8 is fixedly installed at the bottom of the filter box 1. A pressure gauge 18 is fixedly installed on the upper exterior of the spray tank 8. An air inlet pipe 19 is provided below the pressure gauge 18 and fixedly connected to the spray tank 8. A support plate 9 is fixedly installed inside the upper end of the spray tank 8. A connecting shaft 10 is rotatably installed in the center of the support plate 9. Both ends of the connecting shaft 10 penetrate the support plate 9, and a fixing seat 11 is fixedly installed at its upper end. An installation groove is provided in the center of the upper part of the fixing seat 11, and a scraper 12 is fixedly installed in the installation groove. A spray pipe 21 is provided below the support plate 9 and fixedly installed in the spray tank. Inside the tank 8, multiple nozzles 22 are fixedly installed in an array at the bottom of the spray pipe 21. A rotating shaft 25 is provided below the spray pipe 21, and a rotating spiral 26 is welded onto the rotating shaft 25. A slag discharge port is opened on one side of the spray tank 8, and an extrusion cylinder 28 is fixedly installed outside the slag discharge port. A drive motor 27 is fixedly installed on the other side of the spray tank 8. One end of the rotating shaft 25 is rotatably installed inside the spray tank 8, and the other end is rotatably installed inside the extrusion cylinder 28 and passes through the extrusion cylinder 28. The output shaft of the drive motor 27 is fixedly connected to one end of the rotating shaft 25. Baffles 23 are provided on both sides of the rotating shaft 25 and fixedly installed inside the spray tank 8. An arc-shaped filter screen 24 is provided directly below the rotating shaft 25 and fixedly installed between the lower ends of the two baffles 23.During operation, when detecting special gases, the gas to be detected enters the spray tank 8 through the inlet pipe 19. The water pump 20 is started, and liquid is drawn from the bottom of the spray tank 8 through the water pipe 35. After being pressurized by the water pump 20, the liquid is delivered to the spray pipe 21, and then sprayed evenly through the nozzles 22 on the spray pipe 21, washing and filtering the special gas entering the spray tank 8. The sprayed liquid, carrying impurities, falls to the bottom of the spray tank 8. After being filtered by the arc-shaped filter screen 24, the clean liquid can continue to participate in the circulating spray. The drive motor 27 is started, which drives the rotating shaft 25 to rotate. At the same time, through the transmission of the belt 17 and the gearbox 14, the connecting shaft 10 rotates, which in turn drives the scraper 12 to rotate. The scraper 12 moves against the bottom of the filter membrane 7. The cleaning process involves spraying and washing the gas, which rises through the water filter membrane 7 into the filter box 1. The gas then passes through the molecular sieve 6, activated carbon layer 5, and glass fiber layer 4 in sequence before being discharged from the outlet pipe 2. The gas flow control valve 3 adjusts the flow rate of the discharged gas. Solid impurities generated during spraying fall onto the arc-shaped filter screen 24. The rotating screw 26 pushes the impurities on the arc-shaped filter screen 24 through the slag discharge port into the extrusion cylinder 28. Inside the extrusion cylinder 28, the rotating screw, extrusion plate 29, and spring 31 work together to forcefully extrude the impurities. During the extrusion process, the liquid in the impurities is effectively discharged. The treated solid impurities then enter the discharge pipe 32. The sliding sealing plate 33 opens the discharge pipe 32, and the extruded solid impurities are discharged from the discharge pipe 32 under gravity. When it is necessary to replace the liquid or clean the device, the drain valve 36 is opened to discharge the liquid in the spray tank 8 through the drain pipe 34.
[0018] The top of the filter box 1 is fixedly connected to an outlet pipe 2, and a gas flow control valve 3 is installed inside the outlet pipe 2. Three rectangular mounting slots are opened vertically on one side of the filter box 1, and a molecular sieve 6, an activated carbon layer 5, and a glass fiber layer 4 are slidably installed in the rectangular mounting slots respectively. During operation, when detecting special gases, the gas that has been pre-treated by the spray tank 8 enters the filter box 1. First, the gas comes into contact with the molecular sieve 6 to remove impurities such as moisture and carbon dioxide from the gas. Then, the gas passes through the activated carbon layer 5, which adsorbs odors, organic matter, and other impurities from the gas, further purifying the gas. Finally, the gas passes through the glass fiber layer 4, which can intercept residual small particles in the gas. The gas flow control valve 3 is then opened to discharge the filtered gas through the outlet pipe 2.
[0019] A gearbox 14 is fixedly installed at the center of the bottom of the support plate 9. A rotating shaft 15 is rotatably installed on one side of the gearbox 14. One end of the rotating shaft 15 and the lower end of the connecting shaft 10 are both rotatably disposed in the gearbox 14 and fixedly installed with bevel gears 13. The bevel gears 13 are perpendicular to each other and mesh with each other. Rotating wheels 16 are fixedly installed at the same end of the rotating shaft 15 and the rotating shaft 25. The rotating wheels 16 rotate with each other through a belt 17. During operation, when detecting special gases, the drive motor 27 is started, and its output shaft drives the rotating shaft 25 to rotate. The rotating wheels 16 on the rotating shaft 25 drive the rotating shaft 15 to rotate through the belt 17, thereby rotating the rotating shaft 15. The rotating shaft 15 drives the connecting shaft 10 to rotate through the bevel gears 13, so that the scraper 12 can clean the bottom of the filter membrane 7.
[0020] Both sides of the outer end face of the extrusion cylinder 28 are provided with sliding holes, and a sliding rod 30 is slidably installed in the sliding holes. An extrusion plate 29 is fixedly installed at one end of the sliding rod 30. Springs 31 are provided on both sides of one end of the extrusion plate 29 and are fitted onto the sliding rod 30. The extrusion plate 29 is slidably installed on the rotating shaft 25. A discharge pipe 32 is fixedly installed at the bottom of the outer end of the extrusion cylinder 28. A sliding groove is provided on one side of the lower end of the discharge pipe 32, and a sealing plate 33 is slidably installed in the sliding groove. During operation, it is used to detect special gases. During the spraying process, solid impurities generated fall onto the arc-shaped filter screen 24. The rotating screw 26 pushes the impurities on the arc-shaped filter screen 24 through the slag discharge port into the extrusion cylinder 28. Inside the extrusion cylinder 28, the rotating screw, extrusion plate 29, and spring 31 work together to forcefully extrude the impurities. During the extrusion process, the liquid in the impurities is effectively discharged. The treated solid impurities then enter the discharge pipe 32. The sliding sealing plate 33 opens the discharge pipe 32, and the extruded solid impurities are discharged from the discharge pipe 32 under the action of gravity.
[0021] A water pump 20 is fixedly installed above the drive motor 27 and outside the spray tank 8. The outlet of the water pump 20 is fixedly connected to the spray pipe 21. A drain pipe 34 is fixedly installed at the bottom of the spray tank 8. A water intake pipe 35 is fixedly installed on one side of the upper end of the drain pipe 34. The other end of the water intake pipe 35 is fixedly connected to the inlet of the water pump 20. A drain valve 36 is installed inside the lower end of the drain pipe 34. During operation, when detecting special gases, the water pump 20 is started, and liquid is drawn from the bottom of the spray tank 8 through the water intake pipe 35. After being pressurized by the water pump 20, the liquid is transported... The liquid is sent to the nozzle 21 and then sprayed evenly through the nozzle 22 on the nozzle 21 to wash and filter the special gas entering the spray tank 8. The liquid after spraying, carrying impurities, falls to the bottom of the spray tank 8. After being filtered by the arc-shaped filter screen 24, the clean liquid can continue to participate in the circulating spray. When it is necessary to replace the liquid or clean the device, the drain valve 36 is opened to discharge the liquid in the spray tank 8 through the drain pipe 34.
[0022] The drive motor 27, water pump 20, gas flow control valve 3, and pressure gauge are all linearly connected to the PLC controller via power lines, and the PLC controller is used to control their start and stop. During operation, when detecting special gases, the PLC controller controls the speed of the drive motor 27 according to the gas pressure and other preset parameters, thereby adjusting the movement speed of the rotating shaft 25, scraper 12, etc., controlling the start and stop and flow of the water pump 20 to ensure the spraying effect, and controlling the opening of the gas flow control valve 3 to precisely adjust the flow of the discharged gas.
[0023] Working principle: When detecting a special gas, the gas to be detected enters the spray tank 8 through the inlet pipe 19. The water pump 20 is started, and liquid is drawn from the bottom of the spray tank 8 through the water pipe 35. After being pressurized by the water pump 20, the liquid is transported to the spray pipe 21, and then sprayed evenly through the nozzles 22 on the spray pipe 21, washing and filtering the special gas entering the spray tank 8. The sprayed liquid, carrying impurities, falls to the bottom of the spray tank 8. After being filtered by the arc-shaped filter screen 24, the clean liquid can continue to participate in the circulating spray. The drive motor 27 is started, driving the rotating shaft 25 to rotate. Simultaneously, through the transmission of the belt 17 and gearbox 14, the connecting shaft 10 rotates, which in turn drives the scraper 12 to rotate. The scraper 12 then rotates against the bottom of the filter membrane 7. The gas is cleaned by spraying and washing. It rises through the water filter membrane 7 and enters the filter box 1. It is filtered in sequence through the molecular sieve 6, the activated carbon layer 5 and the glass fiber layer 4, and finally discharged from the gas outlet pipe 2. The gas flow control valve 3 can adjust the flow rate of the discharged gas. Solid impurities generated during the spraying process fall onto the arc-shaped filter screen 24. The rotating screw 26 pushes the impurities on the arc-shaped filter screen 24 into the extrusion cylinder 28 through the slag discharge port. In the extrusion cylinder 28, the rotating screw, the extrusion plate 29 and the spring 31 work together to forcefully extrude the impurities. During the extrusion process, the liquid in the impurities is effectively discharged. The treated solid impurities then enter the discharge pipe 32. The sliding sealing plate 33 opens the discharge pipe 32. The extruded solid impurities are discharged from the discharge pipe 32 under the action of gravity. When it is necessary to replace the liquid or clean the device, the drain valve 36 is opened to discharge the liquid in the spray tank 8 through the drain pipe 34.
[0024] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.
Claims
1. A detection gas filter device, characterized by: The system includes a filter box (1), with a circular mounting hole at the bottom of the filter box (1) into which a water filter membrane (7) is fixedly installed. A spray tank (8) is fixedly installed at the bottom of the filter box (1), and a pressure gauge (18) is fixedly installed on the outside of the upper end of the spray tank (8). An air inlet pipe (19) is fixedly connected to the spray tank (8) below the pressure gauge (18). A support plate (9) is fixedly installed inside the upper end of the spray tank (8), and a connecting shaft (10) is rotatably installed in the center of the support plate (9). Both ends of the connecting shaft (10) pass through the support plate (9), and a fixing seat (11) is fixedly installed at the upper end. An installation groove is opened in the center of the upper part of the fixing seat (11), and a scraper (12) is fixedly installed in the installation groove. A spray pipe (21) is fixedly installed inside the spray tank (8) below the support plate (9). Multiple nozzles (22) are fixedly installed in an array at the bottom of the pipe (21). A rotating shaft (25) is provided below the spray pipe (21). A rotating spiral (26) is welded on the rotating shaft (25). A slag discharge port is provided on one side of the spray tank (8). An extrusion cylinder (28) is fixedly installed outside the slag discharge port. A drive motor (27) is fixedly installed on the other side of the spray tank (8). One end of the rotating shaft (25) is rotatably installed inside the spray tank (8), and the other end is rotatably installed inside the extrusion cylinder (28) and passes through the extrusion cylinder (28). The output shaft of the drive motor (27) is fixedly connected to one end of the rotating shaft (25). Baffles (23) are provided on both sides of the rotating shaft (25) and fixedly installed inside the spray tank (8). An arc-shaped filter screen (24) is provided directly below the rotating shaft (25) and fixedly installed between the lower ends of the two baffles (23).
2. The gas detection filter device of claim 1, wherein: The filter box (1) is fixedly connected to the top of the air outlet pipe (2), and the air outlet pipe (2) is equipped with a gas flow control valve (3). Three rectangular mounting slots are opened in sequence on one side of the filter box (1) in the vertical direction. Molecular sieve (6), activated carbon layer (5) and glass fiber layer (4) are slidably installed in the rectangular mounting slots respectively.
3. The gas detection filter device of claim 1, wherein: A gearbox (14) is fixedly installed at the bottom center of the support plate (9). A rotating shaft (15) is rotatably installed on one side of the gearbox (14). One end of the rotating shaft (15) and the lower end of the connecting shaft (10) are both rotatably set in the gearbox (14) and fixedly installed with bevel gears (13). The bevel gears (13) are perpendicular to each other and mesh with each other. Rotating wheels (16) are fixedly installed at the same end of the rotating shaft (15) and the rotating shaft (25). The rotating wheels (16) rotate with each other through a belt (17).
4. The gas detection filter device of claim 1, wherein: The extrusion cylinder (28) has sliding holes on both sides of its outer end face. A sliding rod (30) is slidably installed in the sliding holes. An extrusion plate (29) is fixedly installed at one end of the sliding rod (30). Springs (31) are provided on both sides of one end of the extrusion plate (29) and are fitted onto the sliding rod (30). The extrusion plate (29) is slidably installed on the rotating shaft (25). A discharge pipe (32) is fixedly installed at the bottom of the outer end of the extrusion cylinder (28). A groove is opened on one side of the lower end of the discharge pipe (32), and a sealing plate (33) is slidably installed in the groove.
5. The gas detection filter device of claim 1, wherein: A water pump (20) is fixedly installed above the drive motor (27) outside the spray tank (8). The water outlet of the water pump (20) is fixedly connected to the spray pipe (21). A drain pipe (34) is fixedly installed at the bottom of the spray tank (8). A water intake pipe (35) is fixedly installed on one side of the upper end of the drain pipe (34). The other end of the water intake pipe (35) is fixedly connected to the water inlet of the water pump (20). A drain valve (36) is installed inside the lower end of the drain pipe (34).
6. The gas detection filter device of claim 1, wherein: The drive motor (27), water pump (20), gas flow control valve (3) and pressure gauge are all linearly connected to the PLC controller via power lines, and the PLC controller is used to control their start and stop.