Buried methane detection device

Abstract

The invention belongs to the technical field of detection, and particularly relates to a buried methane detection device which comprises a rectangular box, a cylinder is fixedly mounted at the bottom of the rectangular box, a cavity cylinder is fixedly mounted on the inner wall of the cylinder, a plurality of air inlet holes are formed in the inner walls of the rectangular box and the cavity cylinder, and a plurality of detectors are symmetrically and fixedly mounted on the outer wall of the cavity cylinder. An air exhaust assembly is arranged in the cavity cylinder; when air flow passes through a liquid filtering plate and moves into a cavity cylinder, the liquid filtering plate filters moisture and soil components in the air flow to prevent muddy water from entering the cavity cylinder, when a detector completes detection of the methane content of the air flow, a liquid scraping ring is driven to move, an inclined scraping opening of the liquid scraping ring scrapes the outer wall of the liquid filtering plate, and the gas flow is prevented from entering the cavity cylinder. The filter plate is arranged in the detection cavity, so that mud filtered out of the filter plate is scraped, the situation that the mud accumulates in the filter plate to cause blockage, air flow flowing is affected is prevented, meanwhile, the situation that methane in the air flow is greatly absorbed by the mud in the filter plate can be prevented, and the effect of preventing the mud from entering the detection cavity is achieved.

Description

Technical Field

[0001] The invention belongs to the field of detection technology, and in particular to an underground methane detection device. Background Art

[0002] Methane is a greenhouse gas with a stronger greenhouse effect than carbon dioxide. In the atmosphere, methane absorbs heat reflected from the Earth's surface, contributing to global warming. Human activities such as coal mining, natural gas extraction and transportation, landfills, and agricultural livestock farming lead to increased methane emissions, which contribute to global climate change.

[0003] Buried methane detection is mainly used to monitor the concentration of methane in the underground environment to prevent safety accidents and environmental problems caused by methane leaks.

[0004] A Chinese patent with announcement number CN214584953U discloses a methane detector, which includes that after the methane concentration is detected, the first shell can be slid close to the ventilation hole, and the gas in the windproof cavity is discharged from the body through the ventilation hole to avoid a large amount of methane detected last time remaining in the windproof cavity and affecting the next methane concentration detection. This prepares for the next methane concentration detection. The above actions are repeated to detect the methane concentration at multiple locations in the environment, calculate the average, and accurately detect the actual methane concentration on site.

[0005] In the current existing technology, when detecting the methane content in the soil, since the soil contains a certain amount of moisture, when methane enters the detection device, it may also carry with it a portion of the mud liquid formed by the mixture of water vapor and soil in the soil, and enter the detection device. This mud liquid may accumulate inside the detection device after being left still for a long time, affecting and corroding the internal structure of the detection device. The water liquid will also absorb some methane, which may also affect the accuracy of the detection during detection.

[0006] To this end, the present invention provides an underground methane detection device. Summary of the Invention

[0007] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0008] The technical solution adopted by the present invention to solve its technical problems is as follows: the buried methane detection device of the present invention comprises a rectangular box, a cylindrical body is fixedly mounted on the bottom of the rectangular box, a cavity is fixedly mounted on the inner wall of the cylindrical body, a plurality of air inlet holes are provided on the inner walls of the rectangular box and the cavity, a plurality of detectors are symmetrically fixedly mounted on the outer wall of the cavity, an exhaust assembly is arranged inside the cavity, the exhaust assembly is used to extract methane into the cavity, a water blocking assembly is arranged on the outer wall of the cavity, the water blocking assembly comprises a filtrate plate, the water blocking assembly is used to separate muddy water and methane in the soil air flow through the filtrate plate, a discharge assembly is arranged on the bottom of the inner wall of the cylindrical body, the discharge assembly is used to isolate and discharge the muddy water separated by the water blocking assembly from the cylindrical body, and the discharge assembly is placed below the water blocking assembly; By burying the device into the soil, when it is necessary to detect methane in the soil, the airflow containing methane in the soil is sucked into the cavity by controlling the air extraction component. When the air extraction component pumps the airflow in the soil, the water blocking component separates the muddy water and methane in the soil airflow through the filtrate plate, so that the airflow sucked into the cavity does not contain muddy water, preventing the mud and liquid from accumulating in the cavity due to standing for a period of time, affecting the structural operation in the cavity, and playing a role in removing mud and liquid. When the airflow containing methane enters the detection cavity in the cavity, multiple detectors detect the gas placed in the detection cavity, thereby detecting the methane content in the soil, which plays a role in detecting methane in the soil. The role of content is that when the water-blocking component separates the muddy water and methane in the soil airflow through the filtrate plate, the discharge component isolates and discharges the muddy water separated by the filtrate plate from the cylinder. Since the water can absorb a part of the methane, the muddy water is isolated and discharged from the cylinder through the discharge component. On the one hand, it can prevent the mud from being retained in the cylinder. On the other hand, it can prevent the water retained in the cylinder from absorbing the methane in the airflow when the exhaust component pumps the airflow in the soil, thereby affecting the content of methane entering the cavity and thus affecting the detection accuracy of the detector. By intermittently controlling the operation of the exhaust component, the device can perform regular detection of the methane content in the soil.

[0009] Preferably, the vacuum assembly includes a vacuum piston, a piston cylinder is fixedly mounted on the inner wall of the rectangular box, the outer wall of the vacuum piston is slidably connected to the inner wall of the piston cylinder, and the outer wall of the vacuum piston is slidably connected to the inner wall of the cavity cylinder. When it is necessary to detect methane in the soil, by controlling the vacuum piston to slide in the piston cylinder, the vacuum piston will slide in the cavity cylinder to pump the airflow in the soil, and the airflow will pass through the scraper ring and the air inlet hole on the cavity cylinder into the detection cavity in the cavity cylinder, thereby pumping the airflow into the detection cavity.

[0010] Preferably, baffles are symmetrically and slidably connected to the inner wall of the cavity cylinder. Moving blocks are fixedly installed on the outer walls of both baffles. Reset springs are symmetrically arranged between one side of the moving block and the inner wall of the cylinder body. A pushing block is rotatably connected to the inner wall of the moving block. The outer wall of the air extraction piston can slidably connect with the outer wall of the pushing block. When the air extraction piston slides upward in the cavity cylinder to pump the air flow, the air extraction piston pushes the pushing block upward. When the pushing block is pushed, the pushing block pushes the moving block to squeeze and move the moving block. The two moving blocks will drive the two baffles to slide open to both sides on the inner wall of the cavity cylinder. The air flow placed at the bottom of the cavity cylinder will enter the detection cavity at the top of the cavity cylinder through the space between the two baffles. When the air extraction piston loses contact with the moving block, the reset spring drives the moving block to reset through elastic thrust. The two baffles will slide and reset toward each other in the cavity cylinder so that the two baffles are reattached, playing a role in blocking and circulating the air flow, preventing the detection cavity from still containing methane when the detector does not detect methane in the air flow, which affects the next methane detection operation.

[0011] Preferably, converters are symmetrically and fixedly installed on the inner wall of the rectangular box. The two converters are respectively fixedly installed on the inner wall of the rectangular box. Air flow pipes are symmetrically and fixedly installed on the outer wall of the cavity cylinder. The bottoms of the two converters are respectively fixedly connected to the tops of the two air flow pipes. Check valves are fixedly installed on the outer walls of the two air flow pipes. Four liquid receiving boxes are symmetrically and fixedly installed on the inner wall of the rectangular box. The outer walls of the four liquid receiving boxes are respectively fixedly connected to the two ends of the two converters in pairs. When the detector finishes detecting methane in the air flow, by controlling the check valve to open, the air flow placed in the detection cavity will flow into the converter along the air flow pipe. Through the conversion of the converter, the methane in the air flow is converted from a gaseous state to a liquid state, and then is introduced into the liquid receiving box through a pipeline for collection, playing a role in collecting methane in the air flow. Compared with the existing direct emission, collecting the detected methane can, on the one hand, recycle resources, and on the other hand, prevent the emitted methane from polluting the air.

[0012] Preferably, rectangular plates are symmetrically and fixedly installed on the inner wall of the return spring. Anti-slip rods are fixedly installed on the outer walls of the two rectangular plates. The outer walls of the two anti-slip rods are slidably connected to the inner wall of the pushing block. Return springs are arranged between one side of the two rectangular plates and the outer wall of the pushing block. The two return springs are respectively disposed outside the two anti-slip rods. The outer wall of the pushing block can be slidably connected to the inner wall of the return spring. When the detector finishes detecting methane in the air flow, through the relative return of the two baffles, the detection chamber in the cavity cylinder is in a closed state at this time. The air extraction piston moves for return. When the air extraction piston returns, the air extraction piston squeezes the air flow in the detection chamber to move into the two air flow pipes. When the air extraction piston moves for return and contacts the pushing block, the air extraction piston will squeeze the pushing block to rotate on the inner wall of the moving plate block, and the pushing block will squeeze the return spring to rotate on the anti-slip rod. When the air extraction piston moves for return and contacts the tops of the two baffles, at this time the air extraction piston will lose contact with the pushing block. The pushing block will continue to return under the elastic push of the return spring, providing a contact point for the next movement of the baffle. When the air extraction piston moves and contacts the top of the baffle, at this time the air extraction piston completely squeezes and pushes the air flow in the detection chamber into the two air flow pipes. On the one hand, it can ensure that there is no air flow in the detection chamber. On the other hand, it can accelerate the flow rate of the air flow in the detection chamber into the air flow pipes, which is more conducive to the collection of methane in the air flow.

[0013] Preferably, the water blocking assembly further includes a liquid scraping ring. The liquid scraping ring is slidably connected to the outer wall of the filtrate plate. The filtrate plate is fixedly installed on the bottom outer wall of the liquid scraping ring. Annular inclined scraping openings are formed on the upper and lower surfaces of the liquid scraping ring. When the air extraction piston moves in the cavity cylinder to pump the air flow, the air flow will pass through the filtrate plate and move into the cavity cylinder. The filtrate plate will filter the water and soil components in the air flow to prevent muddy water from entering the cavity cylinder. When the detector finishes detecting the methane content of the air flow entering the detection chamber, by driving the liquid scraping ring to move, the inclined scraping openings at the upper and lower ends of the liquid scraping ring will perform displacement scraping on the outer wall of the filtrate plate, thereby scraping the muddy liquid filtered out in the filtrate plate to prevent the muddy liquid from accumulating and blocking in the filtrate plate, which will affect the air flow while also preventing the muddy liquid placed in the filtrate plate from having a large absorption of methane in the air flow, playing a role in blocking the muddy liquid from entering the detection chamber.

[0014] Preferably, a plurality of racks are fixedly installed on the outer wall of the liquid scraping ring, and a plurality of toothed rods are fixedly installed on the outer wall of the air extraction piston. Gears are arranged between the plurality of racks and the plurality of toothed rods. The teeth on the racks and the toothed rods are all meshed with the teeth on the gears. A plurality of sealing boxes are fixedly installed on the inner wall of the barrel. The outer walls of the plurality of toothed rods are respectively slidably connected with the inner walls of the plurality of sealing boxes. When the air extraction piston moves upward to pump the air flow, the air extraction piston drives the toothed rod to move upward together. When the toothed rod moves upward, through the meshing of the teeth of the gear, the toothed rod will drive the rack to move downward through the gear, and the liquid scraping ring will move downward and scrape on the top of the filter plate, so as to scrape off the sludge filtered out on the outer wall of the filter plate, playing a role in driving the liquid scraping ring to scrape the outer wall of the filter plate. By arranging a sealing mechanism in the sealing box, when the air extraction piston drives the toothed rod to move, the sealing mechanism in the sealing box fills the gap between the toothed rod and the inner wall of the barrel, ensuring that the inside of the barrel is always in a sealed state and preventing the air flow from surging out.

[0015] Preferably, the discharge assembly includes a retaining ring. A ring frame is fixedly installed at the bottom of the retaining ring. A plurality of pressing rods are fixedly installed at the top of the ring frame. The plurality of pressing rods are respectively located directly below the plurality of racks. The inner wall of the retaining ring can be slidably connected with the outer wall of the barrel. When the rack drives the liquid scraping ring to shift and scrape downward on the outer wall of the filter plate, when the bottom of the rack touches the pressing rod, the bottom of the rack will squeeze the top of the pressing rod. When the pressing rod is pressed, the pressing rod will drive the retaining ring to slide out from the outer wall of the bottom end of the filter plate through the ring frame. When the air extraction piston stops moving, at this time, the liquid scraping ring moves to the bottommost part of the outer wall of the filter plate, and the retaining ring will be in an open state. The muddy water scraped off the filter plate surface by the liquid scraping ring will flow downward along the opening at the bottom end of the filter plate, so that the muddy water scraped off by the liquid scraping ring is removed from the inside of the barrel, playing a role in discharging the sludge.

[0016] Preferably, a plurality of hollow shafts are fixedly installed on the inner wall of the barrel. The outer walls of the plurality of pressing rods are respectively slidably connected with the inner walls of the plurality of hollow shafts. Return spring rods are arranged between the bottoms of the plurality of pressing rods and the inner walls of the plurality of hollow shafts. When the pressing rod is pressed, the pressing rod squeezes the return spring rod and slides in the hollow shaft. When the air extraction piston returns to its original position, the rack moves upward. At this time, the pressing rod will lose the extrusion force, and the pressing rod will reset under the action of the elastic thrust of the return spring rod, and the retaining ring will reset again to block the bottom end of the filter plate, playing a role in resetting the retaining ring. By blocking the outer wall of the bottom end of the filter plate with the retaining ring, it can prevent the sludge flowing into the bottom of the barrel from surging back into the inside of the barrel. At the same time, it can also prevent the sludge from absorbing methane at the bottom of the barrel when the sludge stays at the bottom of the barrel without being blocked, which affects the detection.

[0017] Preferably, a liquid collecting plate and an inclined ring block are fixedly installed on the inner wall of the cylinder body. The inclined ring block is placed at the bottom end of the inner wall of the cylinder body, and the inner wall of the inclined ring block is fixedly connected to the outer walls of a plurality of hollow shafts. The liquid collecting plate is placed between the bottom end of the cavity cylinder and the inner wall of the cylinder body. The outer wall of the retaining ring can be slidably connected to the inner wall of the liquid collecting plate, and the outer walls of a plurality of pressure rods are all slidably connected to the inner wall of the liquid collecting plate. A liquid sliding port is formed in the bottom inner wall of the inclined ring block. Through the arrangement of the liquid collecting plate and the inclined ring block, when the mud liquid is scraped by the scraping liquid ring and falls on the liquid collecting plate, due to the arc-shaped setting of the liquid collecting plate, when the retaining ring is opened between the liquid collecting plate and the filtrate plate, the mud liquid will flow along the curved arc surface of the liquid collecting plate towards the opening between the two, preventing the scraped mud liquid from accumulating on the liquid collecting plate. When the mud liquid slides and falls from the opening, the mud liquid will be gathered towards the central position of the inclined ring block by the inner curved arc surface of the inclined ring block, and finally flow out from the liquid sliding port formed at the central position of the inclined ring block and re-enter the soil, playing a role in liquid collection.

[0018] The beneficial effects of the present invention are as follows: 1. For the buried methane detection device of the present invention, when the air flow moves towards the inside of the cavity cylinder through the filtrate plate, the filtrate plate filters the moisture and soil components in the air flow to prevent muddy water from entering the cavity cylinder. When the detector completes the detection of the methane content in the air flow, the scraping liquid ring is driven to move, and the inclined scraping opening of the scraping liquid ring will scrape the outer wall of the filtrate plate, thereby scraping the mud liquid filtered out in the filtrate plate, preventing the mud liquid from accumulating and blocking in the filtrate plate, affecting the air flow while also preventing the mud liquid placed in the filtrate plate from having a large absorption of methane in the air flow, playing a role in blocking the mud liquid from entering the detection cavity.

[0019] 2. For the buried methane detection device of the present invention, when the air extraction piston moves upward to extract the air flow, the air extraction piston drives the toothed rod to move upward together. When the toothed rod moves upward, through the meshing of the teeth of the gear, the toothed rod will drive the rack to move downward through the gear, and the scraping liquid ring will move downward and scrape on the top of the filtrate plate, thereby scraping off the mud liquid filtered out on the outer wall of the filtrate plate, playing a role in driving the scraping liquid ring to scrape the outer wall of the filtrate plate. By arranging a sealing mechanism in the sealing box, when the air extraction piston drives the toothed rod to move, the sealing mechanism in the sealing box fills the gap between the toothed rod and the inner wall of the cavity cylinder to ensure that the inside of the cavity cylinder is always in a sealed state and prevent the air flow from surging out.

[0020] 3. In the buried methane detection device of the present invention, when the pushing block is pushed, the pushing block pushes the moving plate block to squeeze and move the moving plate block. The two moving plate blocks will drive the two baffle plates to slide open to both sides on the inner wall of the cavity cylinder. The air flow placed at the bottom of the cavity cylinder will enter the detection cavity at the top of the cavity cylinder through between the two baffle plates. When the air extraction piston loses contact with the moving plate block, the reset spring drives the moving plate block to reset through elastic thrust. The two baffle plates will slide and reset in the cavity cylinder in opposite directions so that the two baffle plates fit together again, playing a role in blocking and circulating the air flow, preventing the detection cavity from still containing methane when the detector does not detect methane in the air flow, which affects the next methane detection operation.

[0021] 4. In the buried methane detection device of the present invention, when the detector finishes detecting methane in the air flow, by controlling the one-way valve to open, the air flow placed in the detection cavity will flow into the converter along the air flow pipe. Through the conversion of the converter, the methane in the air flow is converted from a gaseous state to a liquid state, and then is introduced into the liquid receiving box through a pipeline for collection, playing a role in collecting methane in the air flow. Compared with the existing direct emission, collecting the detected methane can, on the one hand, recycle resources, and on the other hand, prevent the emitted methane from polluting the air.

[0022] 5. In the buried methane detection device of the present invention, when the air extraction piston moves back and contacts the top of the two baffle plates, at this time the air extraction piston will lose contact with the pushing block. The pushing block will continue to reset under the elastic push of the return spring, providing a contact point for the next movement and opening of the baffle plate. When the air extraction piston moves and contacts the top of the baffle plate, at this time the air extraction piston completely squeezes and pushes the air flow in the detection cavity into the two air flow pipes. On the one hand, it can ensure that there is no air flow in the detection cavity, and on the other hand, it can accelerate the flow speed of the air flow in the detection cavity into the air flow pipes, which is more conducive to the collection of methane in the air flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 is the overall view of the present invention; Figure 2 is the main view of the present invention; Figure 3 is the structural schematic diagram of the air flow pipe in the present invention; Figure 4 is the structural schematic diagram of the baffle plate in the present invention; Figure 5 is the structural schematic diagram of the toothed rod in the present invention; Figure 6 is the structural schematic diagram of the moving plate block in the present invention; Figure 7It is a structural diagram of the push block in the present invention; Figure 8 It is a structural schematic diagram of the pressure rod of the present invention; Figure 9 It is a structural diagram of the ring frame in the present invention; Figure 10 It is a structural schematic diagram of the hollow shaft in the present invention.

[0025] In the figure: 1. rectangular box; 2. cylinder; 3. air flow tube; 301. liquid receiving box; 302. converter; 303. one-way valve; 4. filtrate plate; 5. retaining ring; 501. hollow shaft; 502. pressure rod; 503. ring frame; 504. return rod spring; 6. piston cylinder; 601. suction piston; 7. cavity cylinder; 8. scraper ring; 801. rack; 802. gear; 803. gear rod; 9. baffle; 901. shift plate; 902. return spring; 903. push block; 904. rectangular plate; 905. return block spring; 906. slide limit rod; 10. liquid collecting plate; 11. oblique ring block; 12. detector; 13. sealing box. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0027] like Figures 1 to 10 As shown, a buried methane detection device according to an embodiment of the present invention includes a rectangular box 1, a cylindrical body 2 is fixedly mounted on the bottom of the rectangular box 1, a cavity 7 is fixedly mounted on the inner wall of the cylindrical body 2, a plurality of air inlet holes are provided on the inner walls of the rectangular box 1 and the cavity 7, a plurality of detectors 12 are symmetrically fixedly mounted on the outer wall of the cavity 7, an exhaust assembly is provided inside the cavity 7, the exhaust assembly is used to extract methane into the cavity 7, a water-blocking assembly is provided on the outer wall of the cavity 7, the water-blocking assembly includes a filtrate plate 4, the water-blocking assembly is used to separate muddy water and methane in the soil airflow through the filtrate plate 4, a discharge assembly is provided at the bottom of the inner wall of the cylindrical body 2, the discharge assembly is used to isolate and discharge the muddy water separated by the water-blocking assembly from the cylindrical body 2, and the discharge assembly is placed below the water-blocking assembly; Since the soil contains a certain amount of moisture, when methane enters the detection device, it may also carry with it some of the mud formed by the mixture of water vapor and soil into the detection device. This muddy water may accumulate inside the detection device after being left still for a long time, affecting and corroding the internal structure of the detection device; By burying this device in the soil, when it is necessary to detect methane in the soil, the air flow containing methane in the soil is pumped into the cavity cylinder 7 by controlling the air extraction component. When the air extraction component pumps the air flow in the soil, the water blocking component separates the muddy water and methane in the soil air flow through the filtrate plate 4, so that the air flow pumped into the cavity cylinder 7 does not contain muddy water, preventing the accumulation of muddy liquid due to standing in the cavity cylinder 7 over time and affecting the structural operation in the cavity cylinder 7, playing a role in removing the muddy liquid. When the air flow containing methane enters the detection cavity in the cavity cylinder 7, multiple detectors 12 detect the gas placed in the detection cavity, thereby detecting the methane content in the soil and playing a role in detecting the methane content in the soil. When the water blocking component separates the muddy water and methane in the soil air flow through the filtrate plate 4, the discharge component isolates and discharges the muddy water separated by the filtrate plate 4 from the cylinder body 2. Since the water liquid can absorb a part of methane, by isolating and discharging the muddy water from the cylinder body 2 through the discharge component, on the one hand, it can prevent the muddy liquid from staying in the cylinder body 2, and on the other hand, it can prevent the water liquid staying in the cylinder body 2 from absorbing the methane in the air flow when the air extraction component pumps the air flow in the soil, affecting the methane content entering the cavity cylinder 7 and thus affecting the detection accuracy of the detector 12. By intermittently controlling the operation of the air extraction component, this device can periodically detect the methane content in the soil.

[0028] As Figures 3 to 4 shown, the air extraction component includes an air extraction piston 601. The inner wall of the rectangular box 1 is fixedly installed with a piston cylinder 6. The outer wall of the air extraction piston 601 is slidably connected to the inner wall of the piston cylinder 6, and the outer wall of the air extraction piston 601 is slidably connected to the inner wall of the cavity cylinder 7. When it is necessary to detect methane in the soil, by controlling the sliding of the air extraction piston 601 in the piston cylinder 6, the air extraction piston 601 will slide in the cavity cylinder 7 to pump the air flow in the soil, and the air flow will enter the detection cavity in the cavity cylinder 7 through the scraping liquid ring 8 and the air inlet hole on the cavity cylinder 7, playing a role in pumping the air flow into the detection cavity.

[0029] As Figures 4 to 6 shown, the inner wall of the cavity cylinder 7 is symmetrically and slidably connected with baffles 9. The outer walls of both baffles 9 are fixedly installed with moving plate blocks 901. A reset spring 902 is symmetrically arranged between one side of the moving plate block 901 and the inner wall of the cylinder body 2. The inner wall of the moving plate block 901 is rotatably connected with a pushing block 903. The outer wall of the air extraction piston 601 can be slidably connected to the outer wall of the pushing block 903. When the air extraction piston 601 slides upward in the cylinder 7 to extract the air flow, the air extraction piston 601 pushes the pushing block 903 upward. When the pushing block 903 is pushed, the pushing block 903 pushes the moving plate 901 to squeeze and move the moving plate 901. The two moving plates 901 will drive the two baffles 9 to slide open to both sides on the inner wall of the cylinder 7. The air flow placed at the bottom of the cylinder 7 will enter the detection cavity at the top of the cylinder 7 through between the two baffles 9. When the air extraction piston 601 loses contact with the moving plate 901, the return spring 902 drives the moving plate 901 to reset through elastic thrust. The two baffles 9 will slide and reset in the cylinder 7 in opposite directions so that the two baffles 9 are reattached, playing a role in blocking and circulating the air flow, preventing the detection cavity from still containing methane when the detector 12 does not detect methane in the air flow, which affects the next methane detection operation.

[0030] As Figures 2 to 3 shown, converters 302 are symmetrically and fixedly installed on the inner wall of the rectangular box 1. The two converters 302 are respectively fixedly installed on the inner wall of the rectangular box 1. Air flow pipes 3 are symmetrically and fixedly installed on the outer wall of the cylinder 7. The bottoms of the two converters 302 are respectively fixedly connected to the tops of the two air flow pipes 3. Check valves 303 are fixedly installed on the outer walls of the two air flow pipes 3. Four liquid receiving boxes 301 are symmetrically and fixedly installed on the inner wall of the rectangular box 1. The outer walls of the four liquid receiving boxes 301 are respectively fixedly connected to the two ends of the two converters 302 in pairs; When the detector 12 finishes detecting methane in the air flow, by controlling the check valve 303 to open, the air flow placed in the detection cavity will enter the converter 302 along the air flow pipe 3. Through the conversion of the converter 302, the methane in the air flow is converted from gaseous state to liquid state, and then is introduced into the liquid receiving box 301 through a pipeline for collection, playing a role in collecting methane in the air flow. Compared with the existing direct emission, collecting the detected methane can, on the one hand, recycle resources, and on the other hand, prevent the emitted methane from polluting the air. Here, it should be noted that the converter 302 is a methane converter, and its purpose is to separate methane from the air flow and convert its gaseous state into a liquefied form.

[0031] As Figures 6 to 7 shown, rectangular plates 904 are symmetrically and fixedly installed on the inner wall of the return spring 902. Limit slide rods 906 are fixedly installed on the outer walls of the two rectangular plates 904. The outer walls of the two limit slide rods 906 are slidably connected to the inner wall of the pushing block 903. Return block springs 905 are arranged between one side of the two rectangular plates 904 and the outer wall of the pushing block 903. The two return block springs 905 are respectively placed outside the two limit slide rods 906. The outer wall of the pushing block 903 can be slidably connected to the inner wall of the return spring 902; When the detector 12 finishes detecting methane in the air flow, through the relative reset of the two baffles 9, the detection chamber in the barrel 7 is in a closed state at this time. The air extraction piston 601 moves for reset. When the air extraction piston 601 resets, the air extraction piston 601 squeezes the air flow in the detection chamber to move into the two air flow tubes 3. When the air extraction piston 601 moves for reset and contacts the pushing block 903, the air extraction piston 601 will squeeze the pushing block 903 to rotate on the inner wall of the moving plate 901. The pushing block 903 will squeeze the return spring 905 to rotate on the anti-slip rod 906. When the air extraction piston 601 moves for reset and contacts the tops of the two baffles 9, at this time, the air extraction piston 601 will lose contact with the pushing block 903. The pushing block 903 will continue to reset under the elastic push of the return spring 905, providing a contact point for the next movement of the baffle 9. When the air extraction piston 601 moves and contacts the top of the baffle 9, at this time, the air extraction piston 601 completely squeezes and pushes the air flow in the detection chamber into the two air flow tubes 3. On the one hand, it can ensure that there is no air flow in the detection chamber. On the other hand, it can accelerate the flow rate of the air flow in the detection chamber into the air flow tubes 3, which is more conducive to the collection of methane in the air flow.

[0032] As Figure 8 shown, the water blocking assembly further includes a scraping ring 8. The scraping ring 8 is slidably connected to the outer wall of the filtrate plate 4. The filtrate plate 4 is fixedly installed on the bottom outer wall of the scraping ring 8. Annular inclined scraping openings are formed on both the upper and lower surfaces of the scraping ring 8; When the air extraction piston 601 moves in the barrel 7 to pump the air flow, the air flow will move through the filtrate plate 4 into the interior of the barrel 7. The filtrate plate 4 will filter the water and soil components in the air flow to prevent muddy water from entering the barrel 7. When the detector 12 finishes detecting the methane content of the air flow entering the detection chamber, by driving the scraping ring 8 to move, the inclined scraping openings at both ends of the scraping ring 8 will shift and scrape the outer wall of the filtrate plate 4, thereby scraping the mud liquid filtered out in the filtrate plate 4 to prevent the mud liquid from accumulating and blocking in the filtrate plate 4, which will affect the air flow while also preventing the mud liquid placed in the filtrate plate 4 from having a large absorption of methane in the air flow, playing a role in blocking the mud liquid from entering the detection chamber. It should be noted here that the filtrate plate 4 is made of a hydrophobic and air-permeable filtering material.

[0033] As Figures 5 to 8 shown, a plurality of racks 801 are fixedly installed on the outer wall of the scraping ring 8. A plurality of tooth rods 803 are fixedly installed on the outer wall of the air extraction piston 601. A gear 802 is provided between each of the plurality of racks 801 and the plurality of tooth rods 803. The teeth on the racks 801 and the tooth rods 803 are engaged with the teeth on the gear 802. A plurality of sealing boxes 13 are fixedly installed on the inner wall of the barrel 7. The outer walls of the plurality of tooth rods 803 are respectively slidably connected to the inner walls of the plurality of sealing boxes 13; When the air extraction piston 601 moves upward to pump the air flow, the air extraction piston 601 drives the rack 803 to move upward together. When the rack 803 moves upward, through the tooth engagement of the gear 802, the rack 803 will drive the gear rack 801 to move downward through the gear 802, and the liquid scraping ring 8 will move downward and scrape on the top of the filtrate plate 4, so as to scrape off the mud liquid filtered on the outer wall of the filtrate plate 4, playing a role in driving the liquid scraping ring 8 to scrape the outer wall of the filtrate plate 4. By setting a sealing mechanism in the sealing box 13, when the air extraction piston 601 drives the rack 803 to move, the sealing mechanism in the sealing box 13 fills the gap between the rack 803 and the inner wall of the cylinder 7 to ensure that the inside of the cylinder 7 is always in a sealed state and prevent the air flow from surging out.

[0034] As Figures 8 to 9 shown, the discharge assembly includes a retaining ring 5. A ring frame 503 is fixedly installed at the bottom of the retaining ring 5. A plurality of pressure rods 502 are fixedly installed at the top of the ring frame 503. The plurality of pressure rods 502 are respectively placed directly below the plurality of gear racks 801. The inner wall of the retaining ring 5 can be slidably connected to the outer wall of the cylinder 7. When the gear rack 801 drives the liquid scraping ring 8 to shift and scrape downward on the outer wall of the filtrate plate 4, when the bottom of the gear rack 801 contacts the pressure rod 502, the bottom of the gear rack 801 will squeeze the top of the pressure rod 502. When the pressure rod 502 is pressed, the pressure rod 502 will drive the retaining ring 5 to slide out from the outer wall of the bottom end of the filtrate plate 4 through the ring frame 503. When the air extraction piston 601 stops moving, at this time, the liquid scraping ring 8 moves to the lowermost part of the outer wall of the filtrate plate 4, and the retaining ring 5 will be in an open state. The muddy water scraped off from the surface of the filtrate plate 4 by the liquid scraping ring 8 will flow downward along the opening at the bottom end of the filtrate plate 4, so that the muddy water scraped off by the liquid scraping ring 8 is removed from the inside of the cylinder body 2, playing a role in discharging the mud liquid.

[0035] As Figure 10 shown, a plurality of hollow shafts 501 are fixedly installed on the inner wall of the cylinder body 2. The outer walls of the plurality of pressure rods 502 are respectively slidably connected to the inner walls of the plurality of hollow shafts 501. A return spring 504 is provided between the bottom of each of the plurality of pressure rods 502 and the inner wall of each of the plurality of hollow shafts 501. When the pressure rod 502 is under pressure, the pressure rod 502 squeezes the return rod spring 504 to slide in the hollow shaft 501. When the vacuum piston 601 is reset, the rack 801 moves up. At this time, the pressure rod 502 will lose the squeezing force, and the pressure rod 502 will be reset under the elastic thrust of the return rod spring 504. The baffle ring 5 will be reset again, blocking the bottom end of the filtrate plate 4, playing the role of resetting the baffle ring 5. The baffle ring 5 is used to block the outer wall of the bottom end of the filtrate plate 4, which can prevent the mud and liquid flowing into the bottom of the cylinder 2 from flowing back into the interior of the cylinder 2. At the same time, it can also prevent the mud and liquid from being retained at the bottom of the cylinder 2. Due to the lack of blocking, the mud and liquid absorb methane at the bottom of the cylinder 2, causing an impact on the detection.

[0036] like Figures 8 to 9 As shown, a liquid collecting plate 10 and an oblique ring block 11 are fixedly mounted on the inner wall of the cylinder 2. The oblique ring block 11 is placed at the bottom end of the inner wall of the cylinder 2. The inner wall of the oblique ring block 11 is fixedly connected to the outer walls of the multiple hollow shafts 501. The liquid collecting plate 10 is placed between the bottom end of the cavity 7 and the inner wall of the cylinder 2. The outer wall of the retaining ring 5 can be slidably connected to the inner wall of the liquid collecting plate 10. The outer walls of the multiple pressure rods 502 are all slidably connected to the inner wall of the liquid collecting plate 10. A sliding port is opened on the bottom inner wall of the oblique ring block 11. Through the setting of the liquid collecting plate 10 and the oblique ring block 11, when the mud is scraped by the scraper ring 8 and falls on the liquid collecting plate 10, through the arc surface setting of the liquid collecting plate 10, when the baffle ring 5 is opened from between the liquid collecting plate 10 and the filtrate plate 4, the mud will flow along the curved surface of the liquid collecting plate 10 to the opening between the two, preventing the scraped mud from accumulating on the liquid collecting plate 10. When the mud slides down from the opening, the mud will be attracted by the inner curved surface of the oblique ring block 11 to gather at the center of the oblique ring block 11, and finally flow out from the slippery liquid opening opened at the center of the oblique ring block 11, and return to the soil, playing the role of collecting liquid. It should be noted here that the outer walls of the liquid collecting plate 10, the oblique ring block 11 and the baffle ring 5 should be coated with anti-sticking material to prevent the mud from adhering to their surface and not flowing downward.

[0037] Working principle: By burying this device into the soil, when it is necessary to detect methane in the soil, the air flow containing methane in the soil is pumped into the cavity cylinder 7 by controlling the air extraction component. When the air extraction component pumps the air flow in the soil, the water blocking component separates the muddy water and methane in the soil air flow through the filtrate plate 4, so that the air flow pumped into the cavity cylinder 7 does not contain muddy water, preventing the accumulation of muddy liquid in the cavity cylinder 7 due to standing over time and affecting the structural operation in the cavity cylinder 7, playing a role in removing the muddy liquid. When the air flow containing methane enters the detection cavity in the cavity cylinder 7, multiple detectors 12 detect the gas placed in the detection cavity, thereby detecting the methane content in the soil and playing a role in detecting the methane content in the soil. When the water blocking component separates the muddy water and methane in the soil air flow through the filtrate plate 4, the drainage component isolates and discharges the muddy water separated by the filtrate plate 4 from the cylinder body 2. Since the water liquid can absorb a part of methane, discharging the muddy water from the cylinder body 2 through the drainage component can, on the one hand, prevent the muddy liquid from staying in the cylinder body 2, and on the other hand, prevent the water liquid staying in the cylinder body 2 from absorbing the methane in the air flow when the air extraction component pumps the air flow in the soil, affecting the methane content entering the cavity cylinder 7 and thus affecting the detection accuracy of the detector 12. By intermittently controlling the operation of the air extraction component, this device can detect the methane content in the soil at regular intervals; When it is necessary to detect methane in the soil, by controlling the sliding of the air extraction piston 601 in the piston cylinder 6, the air extraction piston 601 will slide in the cavity cylinder 7 to pump the air flow in the soil, and the air flow will pass through the scraping liquid ring 8 and the air inlet hole on the cavity cylinder 7 and enter the detection cavity in the cavity cylinder 7, playing a role in pumping the air flow into the detection cavity; When the air extraction piston 601 slides upward in the cavity cylinder 7 to pump the air flow, the air extraction piston 601 pushes the push block 903 upward. When the push block 903 is pushed, the push block 903 pushes the moving plate 901 to squeeze and move the moving plate 901. The two moving plates 901 will drive the two baffles 9 to slide open to both sides on the inner wall of the cavity cylinder 7, and the air flow placed at the bottom of the cavity cylinder 7 will enter the detection cavity at the top of the cavity cylinder 7 through between the two baffles 9. When the air extraction piston 601 loses contact with the moving plate 901, the reset spring 902 drives the moving plate 901 to reset through elastic thrust, and the two baffles 9 will slide and reset in the cavity cylinder 7 in opposite directions so that the two baffles 9 fit together again, playing a role in blocking and circulating the air flow, preventing the detection cavity from still containing methane when the detector 12 does not detect the methane in the air flow, affecting the next methane detection operation; When the detector 12 finishes detecting methane in the air flow, by controlling the one-way valve 303 to open, the air flow placed in the detection chamber will flow along the air flow pipe 3 into the converter 302. Through the conversion of the converter 302, the methane in the air flow is converted from a gaseous state to a liquid state, and then is introduced into the liquid receiving box 301 through a pipeline for collection, playing the role of collecting methane in the air flow. Compared with the existing direct emission, collecting the detected methane can, on the one hand, recycle resources, and on the other hand, prevent the emitted methane from polluting the air; When the detector 12 finishes detecting methane in the air flow, through the relative reset of the two baffles 9, the detection chamber in the cylinder 7 is in a closed state at this time. The air extraction piston 601 moves for reset. When the air extraction piston 601 is reset, the air extraction piston 601 squeezes the air flow in the detection chamber to move into the two air flow pipes 3. When the air extraction piston 601 contacts the pushing block 903 during the reset movement, the air extraction piston 601 will squeeze the pushing block 903 to rotate on the inner wall of the moving plate 901, and the pushing block 903 will squeeze the return spring 905 to rotate on the limiting slide rod 906. When the air extraction piston 601 contacts the tops of the two baffles 9 during the reset movement, the air extraction piston 601 will lose contact with the pushing block 903 at this time. The pushing block 903 will continue to reset under the elastic push of the return spring 905, providing a contact point for the next movement of the baffle 9. When the air extraction piston 601 moves and contacts the top of the baffle 9, the air extraction piston 601 completely squeezes and pushes the air flow in the detection chamber into the two air flow pipes 3. On the one hand, it can ensure that there is no air flow in the detection chamber, and on the other hand, it can accelerate the flow rate of the air flow in the detection chamber into the air flow pipes 3, which is more conducive to the collection of methane in the air flow; When the air extraction piston 601 moves in the cylinder 7 to pump the air flow, the air flow will move into the interior of the cylinder 7 through the filter plate 4. The filter plate 4 will filter the moisture and soil components in the air flow to prevent muddy water from entering the cylinder 7. When the detector 12 finishes detecting the methane content in the air flow entering the detection chamber, by driving the scraping ring 8 to move, the inclined scraping openings at the upper and lower ends of the scraping ring 8 will shift and scrape the outer wall of the filter plate 4, so as to scrape the mud liquid filtered out in the filter plate 4, prevent the mud liquid from accumulating and blocking in the filter plate 4, which will affect the air flow while also preventing the mud liquid placed in the filter plate 4 from having a large absorption of methane in the air flow, playing the role of blocking the mud liquid from entering the detection chamber; When the air extraction piston 601 moves upward to pump the air flow, the air extraction piston 601 drives the rack 803 to move upward together. When the rack 803 moves upward, through the tooth engagement of the gear 802, the rack 803 will drive the gear rack 801 to move downward through the gear 802, and the liquid scraping ring 8 will move downward and scrape on the top end of the filtrate plate 4, so as to scrape off the mud liquid filtered on the outer wall of the filtrate plate 4, playing a role in driving the liquid scraping ring 8 to scrape the outer wall of the filtrate plate 4. By setting a sealing mechanism in the sealing box 13, when the air extraction piston 601 drives the rack 803 to move, the sealing mechanism in the sealing box 13 fills the gap between the rack 803 and the inner wall of the cylinder 7 to ensure that the inside of the cylinder 7 is always in a sealed state and prevent the air flow from surging out; When the gear rack 801 drives the liquid scraping ring 8 to shift and scrape downward along the outer wall of the filtrate plate 4, when the bottom of the gear rack 801 touches the pressure rod 502, the bottom of the gear rack 801 will squeeze the top of the pressure rod 502. When the pressure rod 502 is pressed, the pressure rod 502 will drive the retaining ring 5 to slide out from the outer wall at the bottom end of the filtrate plate 4 through the ring frame 503. When the air extraction piston 601 stops moving, at this time, the liquid scraping ring 8 moves to the lowest part of the outer wall of the filtrate plate 4, and the retaining ring 5 will be in an open state, and the muddy water scraped off from the surface of the filtrate plate 4 by the liquid scraping ring 8 will flow downward along the opening at the bottom end of the filtrate plate 4, so that the muddy water scraped by the liquid scraping ring 8 is removed from the inside of the cylinder 2, playing a role in discharging the mud liquid; When the pressure rod 502 is pressed, the pressure rod 502 squeezes the return rod spring 504 to slide in the hollow shaft 501. When the air extraction piston 601 returns to its original position, the gear rack 801 moves upward. At this time, the pressure rod 502 will lose the extrusion force, and the pressure rod 502 will reset under the elastic thrust of the return rod spring 504, and the retaining ring 5 will reset to block the bottom end of the filtrate plate 4, playing a role in resetting the retaining ring 5. By blocking the outer wall at the bottom end of the filtrate plate 4 with the retaining ring 5, it can prevent the mud liquid flowing into the bottom of the cylinder 2 from surging back into the inside of the cylinder 2, and at the same time, it can also prevent the mud liquid from absorbing methane at the bottom of the cylinder 2 due to no blockage when the mud liquid stays at the bottom of the cylinder 2, which affects the detection; Through the setting of the liquid collecting plate 10 and the inclined ring block 11, when the mud liquid is scraped by the liquid scraping ring 8 and falls on the liquid collecting plate 10, due to the arc surface setting of the liquid collecting plate 10, when the retaining ring 5 is opened between the liquid collecting plate 10 and the filtrate plate 4, the mud liquid will flow along the curved arc surface of the liquid collecting plate 10 towards the opening between the two, preventing the scraped mud liquid from accumulating on the liquid collecting plate 10. When the mud liquid slides and falls from the opening, the mud liquid will be gathered towards the center position of the inclined ring block 11 by the inner curved arc surface of the inclined ring block 11 and finally flow out from the liquid sliding port opened at the center position of the inclined ring block 11 and re-enter the soil, playing a role in liquid collection.

[0038] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An underground methane detection device, characterized in that: It includes a rectangular box. A cylinder is fixedly installed at the bottom of the rectangular box. A cavity cylinder is fixedly installed on the inner wall of the cylinder. A plurality of air inlet holes are opened on the inner walls of the rectangular box and the cavity cylinder. A plurality of detectors are symmetrically and fixedly installed on the outer wall of the cavity cylinder. An air extraction component is arranged inside the cavity cylinder. The air extraction component is used to draw methane into the cavity cylinder. A water blocking component is arranged on the outer wall of the cavity cylinder. The water blocking component includes a filtrate plate. The water blocking component is used to separate muddy water and methane in the soil airflow through the filtrate plate. A discharge component is arranged at the bottom of the inner wall of the cylinder. The discharge component is used to isolate and discharge the muddy water separated by the water blocking component from the cylinder. The discharge component is placed below the water blocking component.

2. The buried methane detection device according to claim 1, characterized in that: The air extraction component includes an air extraction piston. A piston cylinder is fixedly installed on the inner wall of the rectangular box. The outer wall of the air extraction piston is slidably connected to the inner wall of the piston cylinder. The outer wall of the air extraction piston is slidably connected to the inner wall of the cavity cylinder.

3. The buried methane detection device according to claim 2, characterized in that: Two baffles are symmetrically and slidably connected to the inner wall of the cavity cylinder. Moving plates are fixedly installed on the outer walls of the two baffles. A reset spring is symmetrically arranged between one side of the moving plate and the inner wall of the cylinder. A pushing block is rotatably connected to the inner wall of the moving plate. The outer wall of the air extraction piston can be slidably connected to the outer wall of the pushing block.

4. The buried methane detection device according to claim 3, characterized in that: Two converters are symmetrically and fixedly installed on the inner wall of the rectangular box. The two converters are respectively fixedly installed on the inner wall of the rectangular box. Airflow pipes are symmetrically and fixedly installed on the outer wall of the cavity cylinder. The bottoms of the two converters are respectively fixedly connected to the tops of the two airflow pipes. Check valves are fixedly installed on the outer walls of the two airflow pipes. Four liquid receiving boxes are symmetrically and fixedly installed on the inner wall of the rectangular box. The outer walls of the four liquid receiving boxes are respectively fixedly connected to the two ends of the two converters in pairs.

5. The buried methane detection device according to claim 4, characterized in that: Rectangular plates are symmetrically and fixedly installed on the inner walls of the reset springs. Limit sliding rods are fixedly installed on the outer walls of the two rectangular plates. The outer walls of the two limit sliding rods are slidably connected to the inner walls of the pushing blocks. Return block springs are arranged between one side of the two rectangular plates and the outer walls of the pushing blocks. The two return block springs are respectively arranged outside the two limit sliding rods. The outer wall of the pushing block can be slidably connected to the inner wall of the reset spring.

6. The buried methane detection device according to claim 5, wherein: The water blocking component further includes a liquid scraping ring. The liquid scraping ring is slidably connected to the outer wall of the filtrate plate. The filtrate plate is fixedly installed on the bottom outer wall of the liquid scraping ring. Annular inclined scraping openings are opened on the upper and lower surfaces of the liquid scraping ring.

7. The buried methane detection device according to claim 6, wherein: A plurality of racks are fixedly installed on the outer wall of the liquid scraping ring. A plurality of tooth rods are fixedly installed on the outer wall of the air extraction piston. Gears are arranged between the plurality of racks and the plurality of tooth rods. The teeth on the racks and the tooth rods are all meshed with the teeth on the gears. A plurality of sealing boxes are fixedly installed on the inner wall of the cavity cylinder. The outer walls of the plurality of tooth rods are respectively slidably connected to the inner walls of the plurality of sealing boxes.

8. The buried methane detection device according to claim 7, wherein: The discharge component includes a retaining ring. A ring frame is fixedly installed at the bottom of the retaining ring. A plurality of pressing rods are fixedly installed on the top of the ring frame. The plurality of pressing rods are respectively placed directly below the plurality of racks. The inner wall of the retaining ring can be slidably connected to the outer wall of the cavity cylinder.

9. The buried methane detection device according to claim 8, characterized in that: A plurality of hollow shafts are fixedly installed on the inner wall of the cylinder. The outer walls of the plurality of pressing rods are respectively slidably connected to the inner walls of the plurality of hollow shafts. Return rod springs are arranged between the bottoms of the plurality of pressing rods and the inner walls of the plurality of hollow shafts.

10. The buried methane detection device according to claim 9, characterized in that: A liquid collecting plate and an inclined ring block are fixedly installed on the inner wall of the cylinder body. The inclined ring block is placed at the bottom end of the inner wall of the cylinder body, and the inner wall of the inclined ring block is fixedly connected to the outer walls of a plurality of hollow shafts. The liquid collecting plate is placed between the bottom end of the cavity cylinder and the inner wall of the cylinder body. The outer wall of the retaining ring can be slidably connected to the inner wall of the liquid collecting plate. The outer walls of a plurality of pressure rods are all slidably connected to the inner wall of the liquid collecting plate. A liquid sliding port is formed in the bottom inner wall of the inclined ring block.

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