Methane gas concentration monitoring device

Abstract

The invention belongs to the technical field of methane monitoring, and particularly relates to a methane gas concentration monitoring device which comprises a pair of mounting frames, a storage box is fixedly connected to the top ends of the mounting frames, an inflation pump is fixedly connected to the top end of the storage box, the input end of the inflation pump is communicated with the storage box, and the output end of the inflation pump is fixedly connected with a first electromagnetic valve. The output end of the first electromagnetic valve communicates with and is fixedly connected with an inflation pipe, and a positioning plate is arranged above the mounting frame. According to the methane gas concentration monitoring device, during detection, the detection head moves to be attached to the annular circumferential surfaces of the flanges, the corrugated pipe sprays out clean air through the detection head, so that air in the area between the pair of flanges is intermittently clean, and when methane gas leaks at the joint of the pipelines, the detection head is moved to be attached to the annular circumferential surfaces of the flanges. Methane gas can quickly escape to an area between the pair of flanges, and then an early warning signal is sent out; meanwhile, interference of water vapor and impurity particles in air on detection laser is avoided, the detection precision is improved, and the detection effect is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of methane monitoring, and specifically relates to a methane gas concentration monitoring device. Background Art

[0002] Laser methane detection is a method for detecting combustible gases that uses laser technology to detect methane gas. Its principle is based on the absorption characteristics of methane molecules for laser beams with specific wavelengths. When a laser beam passes through methane gas, methane molecules will absorb light with a specific wavelength. During the process of methane molecules absorbing light, the energy of the beam is weakened, that is, the light intensity decreases. The detector can calculate the concentration of the detected methane gas by receiving the reflected beam and measuring the change in light intensity.

[0003] The existing methane monitoring technology refers to the real-time monitoring of methane at specific locations. For example, in oil and gas extraction operations, it is necessary to use a methane monitoring device to continuously monitor the concentration of methane in the extraction environment. The specific detection locations can be the cover openings of oil and gas storage tanks, the tank transportation areas, the connections of oil and gas transportation pipelines, etc. By continuously monitoring with the methane monitoring device, it is of great significance to ensure the safety of oil and gas extraction operations. After the oil and gas are processed, the processed methane gas needs to be transported to other areas. During the transportation process, multiple transportation pipelines are usually used, and the pipelines are generally connected by flanges. When the environment where the pipelines are located is relatively harsh, such as in cities in the north where the temperature difference between day and night is large and there is a lot of haze in the air, and the haze is composed of particles such as dust, sulfuric acid, nitric acid, and organic hydrocarbons. Over a long period in such an environment, the flanges at the pipeline connections will inevitably be corroded. At the same time, the gaskets used to seal the pipelines are also easily corroded and damaged, resulting in a decrease in the pipeline sealing effect and methane leakage. Therefore, it is necessary for the staff to regularly inspect and maintain the pipeline connections. In order to continuously monitor whether there is methane gas leakage at the pipeline connections, the staff usually fix a methane gas detection device on one side of the pipeline connection. The methane gas detection device emits detection laser light towards the pipeline connection. Since the density of methane gas is less than that of air, the detection laser is usually controlled to point to the uppermost position of the pipeline connection. When there is methane gas leakage at the pipeline connection, the leaked methane will disperse into the surrounding area of the pipeline connection and gradually move upward. Then the detection laser will detect the leaked methane gas. After that, the methane gas detection device sends a warning signal to an external warning device through an electrical signal to remind the inspection and maintenance personnel to arrive at the scene urgently for handling. However, during the actual monitoring process of the methane gas detection device, when the haze concentration in the air is relatively high, the water vapor and impurity particles in the haze will hinder the transmission of the laser light emitted by the methane gas detection device. Specifically, the water vapor and impurity particles in the haze will cause the laser to scatter or attenuate, affecting the signal intensity, and further resulting in a decrease in the detection accuracy. The more detailed principle of the influence is publicly known content and can be retrieved in books and online. Based on the above, it can be concluded that in the northern region, the methane gas detection device will be affected by the haze weather when monitoring whether there is methane leakage at the pipeline connection, resulting in a decrease in the detection accuracy and affecting the monitoring effect.

[0004] Therefore, the present invention provides a methane gas concentration monitoring device. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art and solve at least one of the technical problems proposed in the background art.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: A methane gas concentration monitoring device described in the present invention includes a pair of mounting brackets. A storage box is fixedly connected to the top end of the mounting bracket. An air inflation pump is fixedly connected to the top end of the storage box. The input end of the air inflation pump is communicated with the storage box, and the output end of the air inflation pump is fixedly connected and communicated with a first electromagnetic valve. The output end of the first electromagnetic valve is fixedly connected and communicated with an air inflation pipe. A positioning plate is arranged above the mounting bracket, and a pair of support members are installed between the bottom end of the positioning plate and the top end of the mounting bracket; One end of the air inflation pipe far from the first electromagnetic valve is fixedly connected and communicated with a second electromagnetic valve. The second electromagnetic valve is fixedly connected to the surface of the positioning plate. The output end of the second electromagnetic valve penetrates through the fixed plate. A corrugated pipe is fixedly connected to the side of the fixed plate away from the second electromagnetic valve. The output end of the second electromagnetic valve is communicated with the corrugated pipe. One end of the corrugated pipe far from the positioning plate is fixedly connected and communicated with a docking head. One end of the docking head far from the corrugated pipe is fixedly connected and communicated with a detection head. A support frame is fixedly connected to the side surface of the positioning plate and inside the corrugated pipe. A housing is fixedly connected to the surface of the support frame. A glass cover is fixedly connected to the end of the housing away from the support frame; A hydraulic cylinder is fixedly connected to the top end of the positioning plate. The output end of the hydraulic cylinder is fixedly connected with a collar, and the collar is sleeved and fixed on the surface of the docking head.

[0007] Preferably, a third electromagnetic valve is fixedly connected and communicated with the surface of the air inflation pipe. The output end of the third electromagnetic valve is fixedly connected and communicated with a first conduit. One end of the first conduit far from the third electromagnetic valve is fixedly connected and communicated with a first connecting cylinder. One end of the first connecting cylinder far from the first conduit is fixedly connected and communicated with a second conduit. A third conduit is fixedly connected and communicated with the side surface of the first connecting cylinder. One end of the third conduit far from the first connecting cylinder is fixedly connected and communicated with a second connecting cylinder. The end of the second connecting cylinder is fixedly connected and communicated with a fourth conduit. A pair of fixed plates are symmetrically and fixedly connected to the upper and lower ends of the detection head. An expansion airbag is arranged on one side of the pair of fixed plates facing each other. The opening of the expansion airbag is fixedly connected to the surface of the fixed plate. One end of the second conduit far from the first connecting cylinder penetrates through the fixed plate at the top end of the detection head and is communicated with the expansion airbag. One end of the fourth conduit far from the second connecting cylinder penetrates through the fixed plate at the bottom end of the detection head and is communicated with the expansion airbag; A pair of fifth electromagnetic valves are fixedly connected to both sides of the detection head, and the input ends of the fifth electromagnetic valves penetrate into the inside of the detection head.

[0008] Preferably, a plurality of elastic pull ropes are arranged inside the expansion airbag. One end of the elastic pull rope is fixedly connected to the surface of the fixed plate, and the other end is connected to the part of the expansion airbag farthest from the fixed plate after inflation.

[0009] Preferably, an isolation box is fixedly connected to the surface of the fixed plate. The expansion airbag is located inside the isolation box when not inflated. A pair of flexible flappers are fixedly connected to the opening on the side of the isolation box away from the fixed plate. A magnetic strip is fixedly connected to one side of the pair of flexible flappers facing each other.

[0010] Preferably, a fourth solenoid valve is fixedly connected to the side surface of the storage box. The output end of the fourth solenoid valve communicates with the storage box, and an air extraction pump is fixedly connected to the input end of the fourth solenoid valve in a communicating manner.

[0011] Preferably, a filter screen plate is fixedly connected to the input end of the air extraction pump. The filter screen plate is used for filtering the air drawn into the air extraction pump.

[0012] Preferably, a partition plate is fixedly connected inside the storage box. A pressure sensor is fixedly connected to the top end of the partition plate, and a sixth solenoid valve is fixedly connected to the top end of the partition plate. The input end of the sixth solenoid valve penetrates through the partition plate.

[0013] Preferably, a scraping strip is slidably connected to the surface of the glass cover. A pair of guide rods are symmetrically inserted at the top end of the scraping strip. The bottom ends of the guide rods are fixedly connected to the inner wall of the docking head. A support spring is sleeved on the surface of the guide rods. The top end of the support spring is connected to the bottom end of the scraping strip, and the bottom end of the support spring is connected to the inner wall of the docking head. A pair of inclined rods are arranged inside the docking head and below the scraping strip. A fixing piece is fixedly connected between the bottom ends of the inclined rods and the inner wall of the docking head. A sliding ring is slidably connected to the surface of the inclined rods. A connecting rope is fixedly connected between the sliding ring and the end of the scraping strip. A wind baffle is fixedly connected to the surface of the sliding ring.

[0014] Preferably, a nozzle is fixedly connected to the bottom end of the scraping strip. The air inlet of the nozzle faces the fixing plate, and the air outlet of the nozzle points to the connection part between the scraping strip and the glass cover.

[0015] Preferably, the support member includes a support plate and a fixing frame; the fixing frame is fixedly connected to the side surface of the positioning plate. A tightening nut is fixedly connected to the surface of the fixing frame. A tightening bolt is arranged through the side surface of the support plate. The tightening bolt is engaged and fastened with the tightening nut for fixing the support plate and the fixing frame; a plugging groove is formed at the top end of the mounting frame and below the support plate. A plurality of gaskets are stacked inside the plugging groove. The bottom end of the support plate is plugged inside the plugging groove and supported by the gaskets.

[0016] The beneficial effects of the present invention are as follows: 1. For a methane gas concentration monitoring device of the present invention, by arranging a detection head, during detection, the detection head moves and adheres to the annular circumferential surface of the flange. The corrugated pipe sprays clean air through the detection head, so that the air in the area between a pair of flanges is intermittently clean. At this time, when methane gas leaks at the connection between the pipes, the methane gas will quickly escape into the area between a pair of flanges. At this time, there is no flow of clean gas, water vapor and impurity particles in the area between a pair of flanges. Therefore, the methane gas can be quickly detected by the detection laser, and then a warning signal is sent out; ensuring the durability of detection, at the same time avoiding the interference of water vapor and impurity particles in the air to the detection laser, improving the detection accuracy and ensuring the detection effect.

[0017] 2. In a methane gas concentration monitoring device according to the present invention, by providing a scraping strip, in hazy weather, water vapor and impurity particles in the air may enter the inside of the docking head through the opening of the detection head, and then adhere to the glass cover, obstructing the detection laser and affecting the detection accuracy. Therefore, a scraping strip is provided. When the air extraction pump is started, there is gas flow inside the bellows, and the air flow provides a thrust to the wind deflector, causing the wind deflector to drive the collar to slide downward on the surface of the inclined rod. The collar drives the scraping strip to move downward through the connecting rope, and the scraping strip moves downward along the guide rod to scrape off the water vapor and impurity particles adhering to the surface of the glass cover, avoiding the influence of water vapor and impurity particles on the detection laser and affecting the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 is a perspective view of the present invention; Figure 2 is a schematic structural diagram of the mounting bracket of the present invention; Figure 3 is a schematic structural diagram of the inside of the storage box of the present invention; Figure 4 is a schematic structural diagram of the positioning plate of the present invention; Figure 5 is a schematic structural diagram of the lower part of the support plate of the present invention; Figure 6 is a schematic diagram of the position of the insertion slot of the present invention; Figure 7 is a schematic structural diagram of the lower part of the fixing plate of the present invention; Figure 8 is a three-dimensional view of the internal structure of the expansion airbag of the present invention; Figure 9 is a schematic side view of the structure on the mounting bracket of the present invention; Figure 10 is a schematic diagram of the detection head of the present invention; Figure 11 is a schematic structural diagram of the inside of the bellows of the present invention; Figure 12 is a schematic structural diagram of the inside of the docking head of the present invention; Figure 13 is a schematic diagram of the glass cover connection structure of the present invention; Figure 14 is a schematic diagram of the scraping strip connection structure of the present invention; Figure 15 is a schematic diagram of the position of the nozzle of the present invention; Figure 16 is a schematic diagram of the inclined rod connection structure of the present invention.

[0020] In the figure: 1. mounting bracket; 10. plug-in slot; 11. storage box; 110. partition board; 111. pressure sensor; 112. sixth solenoid valve; 12. fourth solenoid valve; 13. air extraction pump; 14. air inflation pump; 15. first solenoid valve; 151. air inflation pipe; 152. second solenoid valve; 2. support member; 201. support plate; 202. fixing frame; 203. tightening bolt; 204. gasket; 21. positioning plate; 210. support frame; 22. bellows; 23. docking head; 24. detection head; 241. fifth solenoid valve; 3. hydraulic cylinder; 31. collar; 4. third solenoid valve; 41. first conduit; 42. first connecting cylinder; 43. second conduit; 44. fixing plate; 45. isolation box; 451. flexible baffle; 46. third conduit; 47. second connecting cylinder; 48. fourth conduit; 49. expansion airbag; 491. elastic pull cord; 5. housing; 51. glass cover; 6. scraping strip; 60. spray head; 61. guide rod; 62. support spring; 7. inclined rod; 71. sliding ring; 72. wind baffle. Detailed implementation manners

[0021] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0022] As Figures 1 to 16 shown, a methane gas concentration monitoring device according to an embodiment of the present invention includes a pair of mounting brackets 1. A storage box 11 is fixedly connected to the top end of the mounting bracket 1. An air inflation pump 14 is fixedly connected to the top end of the storage box 11. The input end of the air inflation pump 14 is communicated with the storage box 11. The output end of the air inflation pump 14 is communicated and fixedly connected with a first solenoid valve 15. The output end of the first solenoid valve 15 is communicated and fixedly connected with an air inflation pipe 151. A positioning plate 21 is arranged above the mounting bracket 1. A pair of support members 2 are installed between the bottom end of the positioning plate 21 and the top end of the mounting bracket 1. One end of the air inflation pipe 151 away from the first solenoid valve 15 is communicated and fixedly connected with a second solenoid valve 152. The second solenoid valve 152 is fixedly connected to the surface of the positioning plate 21. The output end of the second solenoid valve 152 penetrates through the positioning plate 21. A bellows 22 is fixedly connected to the side of the positioning plate 21 away from the second solenoid valve 152. The output end of the second solenoid valve 152 is communicated with the bellows 22. One end of the bellows 22 away from the positioning plate 21 is communicated and fixedly connected with a docking head 23. One end of the docking head 23 away from the bellows 22 is communicated and fixedly connected with a detection head 24. A support frame 210 is fixedly connected to the side surface of the positioning plate 21 and inside the bellows 22. A housing 5 is fixedly connected to the surface of the support frame 210. A glass cover 51 is fixedly connected to the end of the housing 5 away from the support frame 210. A hydraulic cylinder 3 is fixedly connected to the top end of the positioning plate 21. A collar 31 is fixedly connected to the output end of the hydraulic cylinder 3. The collar 31 is sleeved and fixed on the surface of the docking head 23. When monitoring whether methane leaks between pipelines through a methane gas detection device, haze weather is likely to occur for a long time in the northern region. In haze weather, the detection laser emitted by the methane gas detection device will be interfered by water vapor and impurity particles in the air, resulting in a decrease in detection accuracy and affecting the monitoring effect. To solve the above problems, the embodiments of the present invention are provided with structures such as a bellows 22 and a detection head 24. The specific use process is as follows: When monitoring whether methane gas leaks between pipelines, first fix the mounting frame 1 on the bottom surfaces on both sides of the pipeline connection, and align the detection head 24 with the side surfaces of a pair of flanges at the pipeline connection. The side of the detection head 24 facing the flange is set as an arc surface and is adapted to the annular circumferential surface of the flange. The inside of the detection head 24 is hollow, and an arc-shaped opening is provided on the arc surface. The docking head 23 is communicated with the detection head 24. When the air is good, the laser emission component inside the housing 5 emits a detection laser. The laser emission component is a structure that emits laser, specifically including structures such as a laser diode, a drive circuit, and a temperature control module. The detection laser emitted by the laser emission component is emitted outward through the glass cover 51, then enters the inside of the detection head 24 through the docking head 23, and then is emitted out through the opening of the detection head 24 to the uppermost position of the pipeline connection. When methane gas leaks at the pipeline connection, no matter which position of the pipeline connection leaks, the methane gas diffuses upward and finally contacts the detection laser and is detected. Then the detection device sends out a warning signal to the outside to remind the inspection and maintenance personnel to arrive at the scene for handling. When haze weather occurs, the hydraulic cylinder 3 is started, and the output end of the hydraulic cylinder 3 drives the collar 31 to move towards the flange. During this process, the bellows 22 is pulled and elongated, and the docking head 23 drives the detection head 24 to move synchronously. It stops when the arc surface of the detection head 24 contacts the annular circumferential surface of the flange. At this time, the opening of the detection head 24 is located in the middle of a pair of flanges. At the same time, the air pump 14 is started, and the first solenoid valve 15 and the second solenoid valve 152 are opened. The storage tank 11 stores clean air in advance. The air pump 14 pumps out the gas inside the storage tank 11, and then injects the clean air into the inside of the bellows 22 through the air injection pipe 151. The clean air entering the inside of the bellows 22 continues to move through the docking head 23 into the hollow cavity inside the detection head 24, and finally is discharged through the opening of the hollow cavity to form a stable jet airflow. The airflow acts on the pipeline connection between a pair of flanges, taking out the water vapor and impurity particles between the pair of flanges to the area between the pair of flanges, and controlling the intermittent ejection of the clean gas, so that the air in the area between the pair of flanges is intermittently cleaned. At this time, when methane gas leaks at the pipeline connection, the methane gas will quickly diffuse to the area between the pair of flanges. At this time, there is no flow of clean gas, water vapor, and impurity particles in the area between the pair of flanges. Therefore, the methane gas will be quickly detected by the detection laser, and then a warning signal is sent out.When it is detected that there is no leakage of methane gas, the detection head 24 is controlled to reset. The entire control process is controlled by a microcomputer. The detection head 24 intermittently moves to dock with the circumferential surface of the flange, saving the clean air stored in the storage tank 11, enabling the detection method of cleaning the water vapor and impurity particles between a pair of flanges to continue during smoggy weather, ensuring the durability of detection. At the same time, it avoids the interference of water vapor and impurity particles in the air on the detection laser, improves the detection accuracy, and ensures the detection effect; it should be noted that the support frame 210 does not block the output end of the second solenoid valve 152.;

[0023] The surface of the charging pipe 151 is connected and fixed with a third solenoid valve 4. The output end of the third solenoid valve 4 is connected and fixed with a first conduit 41. One end of the first conduit 41 far from the third solenoid valve 4 is connected and fixed with a first connection cylinder 42. One end of the first connection cylinder 42 far from the first conduit 41 is connected and fixed with a second conduit 43. The side surface of the first connection cylinder 42 is connected and fixed with a third conduit 46. One end of the third conduit 46 far from the first connection cylinder 42 is connected and fixed with a second connection cylinder 47. The end of the second connection cylinder 47 is connected and fixed with a fourth conduit 48. A pair of fixing plates 44 are symmetrically fixed at the upper and lower ends of the detection head 24. An expansion airbag 49 is arranged on one side of the pair of fixing plates 44 facing each other. The opening of the expansion airbag 49 is fixed on the surface of the fixing plate 44. One end of the second conduit 43 far from the first connection cylinder 42 penetrates through the fixing plate 44 at the top end of the detection head 24 and is connected with the expansion airbag 49. One end of the fourth conduit 48 far from the second connection cylinder 47 penetrates through the fixing plate 44 at the bottom end of the detection head 24 and is connected with the expansion airbag 49; A pair of fifth solenoid valves 241 are fixed on both sides of the detection head 24. The input end of the fifth solenoid valve 241 penetrates into the interior of the detection head 24; When controlling the detection head 24 to contact the annular peripheral surface of the flange, the fixing plate 44 moves synchronously, and the fixing plate 44 is inserted between a pair of flanges. Both ends of the fixing plate 44 are slidably connected with the inner wall of the flange;Control the air pump 14 to continuously pump air, and control the second solenoid valve 152 to close. At the same time, the third solenoid valve 4 is opened. The third solenoid valve 4 receives the air inside the air charging pipe 151 and injects the air into the first connection cylinder 42 through the first conduit 41. The first connection cylinder 42 injects the air into the expansion airbag 49 at the top of the detection head 24 through the second conduit 43. At the same time, the first connection cylinder 42 injects the air into the second connection cylinder 47 through the third conduit 46. The second connection cylinder 47 injects the control air into the expansion airbag 49 at the bottom of the detection head 24 through the fourth conduit 48. When the expansion airbag 49 expands, it adheres to the inner wall of the flange. And when the expansion airbags 49 on both sides of the flange expand, they approach each other and finally adhere to each other. A pair of detection heads 24, in cooperation with the fixing plate 44 and the expanded expansion airbag 49, can seal the pipe connection between a pair of flanges to form a sealed detection space. After that, control the third solenoid valve 4 to close, and open the second solenoid valve 152 and the fifth solenoid valve 241. The clean air pumped out by the air pump 14 enters the corrugated pipe 22. The clean air is sprayed into the sealed detection space through the hollow cavity and the opening inside the detection head 24. When the air fills the sealed detection space, the clean air carries the water vapor and impurity particles inside the sealed space and is discharged through the fifth solenoid valve 241. After the air pump 14 is started for a period of time, it is closed, and at the same time, the fifth solenoid valve 241 is closed. The water vapor and impurity particles in the sealed detection space are discharged. After that, when there is a leak at the pipe connection, the leaked methane gas will gather in the sealed detection space and be quickly detected by the detection laser wire break. The detection accuracy is further improved, and the influence of external wind can be avoided. It should be noted that after the detection is completed, close the second solenoid valve 152, open the first solenoid valve 15 and the third solenoid valve 4, and control the air pump 14 to pump air from the air charging pipe 151. The clean air inside the expansion airbag 49 will be pumped back into the storage tank 11. After that, close the first solenoid valve 15 and the third solenoid valve 4, and control the detection head 24 to reset. For the next detection, the air pump 14 continues to pump out the clean air inside the storage tank 11.;

[0024] A plurality of elastic drawstrings 491 are arranged inside the expansion airbag 49. One end of the elastic drawstring 491 is fixedly connected to the surface of the fixing plate 44, and the other end is connected to the part of the expansion airbag 49 that is farthest from the fixing plate 44 after expansion. When the expansion airbag 49 is inflated, the elastic drawstring 491 will limit the expansion direction of the expansion airbag 49 and prevent the expansion airbag 49 from expanding towards the pipe connection, so as to avoid the expansion airbag 49 adhering to the pipe connection when it expands and blocking the leaked methane gas at the pipe connection, interfering with the detection process.

[0025] The surface of the fixed plate 44 is fixedly connected with an isolation box 45. When the expansion airbag 49 is not inflated, it is located inside the isolation box 45. One side of the isolation box 45 away from the fixed plate 44 is open and is estimated to have a pair of flexible baffles 451. A magnetic strip is fixedly connected to the opposite side of the pair of flexible baffles 451. When the expansion airbag 49 expands, the expansion airbag 49 gradually disengages from the isolation box 45 and pushes open the flexible baffle 451. When the expansion airbag 49 is deflated and shrinks, the expansion airbag 49 will gradually shrink into the isolation box 45. When the expansion airbag 49 is completely shrunk into the isolation box 45, the magnetic strips at the ends of the flexible baffles 451 attract and dock with each other, so that the flexible baffle 451 seals the opening of the isolation box 45, preventing the expansion airbag 49 from being continuously exposed to the air and being affected by wind and light, which accelerates aging.

[0026] A fourth solenoid valve 12 is fixedly connected to the side of the storage box 11. The output end of the fourth solenoid valve 12 communicates with the storage box 11. The input end of the air extraction pump 13 is fixedly connected and communicated with the air extraction pump 13. When the air quality is good, the fourth solenoid valve 12 is opened, and at the same time the air extraction pump 13 is started. The air extraction pump 13 pumps the clean outside air into the storage box 11 for convenient use during subsequent detection. And a filter screen plate is fixedly connected to the input end of the air extraction pump 13. The filter screen plate is used to filter the air pumped by the air extraction pump 13 to prevent the air extraction pump 13 from being blocked by foreign objects.

[0027] A partition 110 is fixedly connected inside the storage box 11. A pressure sensor 111 is fixedly connected to the top of the partition 110, and a sixth electromagnetic valve 112 is fixedly connected to the top of the partition 110. The input end of the sixth electromagnetic valve 112 penetrates through the partition 110. When the air pump 14 pumps clean air into the interior of the storage box 11, the air above the partition 110 is first pumped away. Then, the air pressure above the partition 110 drops. The pressure sensor 111 detects the change in the air pressure above the partition 110. When the air pressure in the area above the partition 110 is relatively low, it controls the sixth electromagnetic valve 112 to open, enabling the air in the area below the partition 110 to enter the area above the partition 110. Since the clean air pumped into the interior of the storage box 11 by the air pump 13 is stored in the area below the partition 110, the gas pressure in the area below the partition 110 is relatively high. When the sixth electromagnetic valve 112 is opened, the air in the area below the partition 110 automatically drains into the area above the partition 110 under the action of the gas pressure. The pressure sensor 111 detects the change in the air pressure above the partition 110 and closes the sixth electromagnetic valve 112 when the air pressure in the area above the partition 110 reaches the preset value, so that the air pressure in the area above the partition 110 remains stable continuously. When the air pump 14 pumps air in the area above the partition 110, it remains stable, preventing the air pressure inside the storage box 11 from being too high when the air pump 14 pumps air inside the storage box 11, which may cause a sudden change in the pressure difference when the air pump 14 pumps air and damage the air pump 14. It should be noted that a sudden change in the pressure difference of the air pump is likely to cause damage to the air pump. The specific reasons for the damage to the air pump are as follows: When the outlet pressure of the air pump suddenly increases, the air pump needs to resist a very large back pressure, and the piston rod, connecting rod or rotor may bend or break due to overload; the sudden change in pressure will cause the air flow inside the air pump to be disordered, the movement of the rotor or piston to be unstable, and high-frequency vibration to occur. Long-term action will cause the bearing seat to become loose and the shell weld to crack, etc. The embodiments of the present invention will not list them one by one. The electromagnetic valve used in the embodiments of the present invention is a high-pressure-resistant electromagnetic valve, such as an angle seat type electromagnetic valve, etc.

[0028] A squeegee 6 is slidably connected to the surface of the glass cover 51. At the top of the squeegee 6, a pair of guide rods 61 are symmetrically inserted. The bottom ends of the guide rods 61 are fixedly connected to the inner wall of the docking head 23. A support spring 62 is sleeved on the surface of the guide rod 61. The top end of the support spring 62 is connected to the bottom end of the squeegee 6, and the bottom end of the support spring 62 is connected to the inner wall of the docking head 23. Inside the docking head 23 and below the squeegee 6, a pair of inclined rods 7 are provided. A fixing member is fixedly connected between the bottom end of the inclined rod 7 and the inner wall of the docking head 23. A sliding ring 71 is slidably connected to the surface of the inclined rod 7. A connecting rope 73 is fixedly connected between the sliding ring 71 and the end of the squeegee 6. A wind shield 72 is fixedly connected to the surface of the sliding ring 71; in a smoggy weather, water vapor and impurity particles in the air may enter the inside of the docking head 23 through the opening of the detection head 24, and then adhere to the glass cover 51, obstructing the detection laser and affecting the detection accuracy; for this reason, the squeegee 6 is provided. When the air pump 14 is started, there is gas flow inside the corrugated pipe 22, and the air flow provides a thrust force for the wind shield 72, so that the wind shield 72 drives the sliding ring 71 to slide downward on the surface of the inclined rod 7. The sliding ring 71 drives the squeegee 6 to move downward through the connecting rope 73, and the squeegee 6 moves downward along the guide rod 61 to scrape off the water vapor and impurity particles adhering to the surface of the glass cover 51, avoiding the influence of water vapor and impurity particles on the detection laser and affecting the detection accuracy.

[0029] A nozzle 60 is fixedly connected to the bottom end of the squeegee 6. The air inlet of the nozzle 60 faces the positioning plate 21, and the air outlet of the nozzle 60 points to the connection between the squeegee 6 and the glass cover 51; the air flow inside the corrugated pipe 22 enters the inside of the nozzle 60 through the air inlet of the nozzle 60, and then is sprayed out through the air outlet to the connection between the squeegee 6 and the glass cover 51, so that the water vapor and impurity particles scraped by the squeegee 6 are blown towards the boundary of the glass cover 51 and finally separated from the glass cover 51. The setting of the nozzle 60 is beneficial to the cleaning of the glass cover 51.

[0030] The support member 2 includes a support plate 201 and a fixing frame 202; the fixing frame 202 is fixedly connected to the side surface of the positioning plate 21, a tightening nut is fixedly connected to the surface of the fixing frame 202, a through hole is provided on the side surface of the support plate 201 for a tightening bolt 203, and the tightening bolt 203 is engaged and tightened with the tightening nut for fixing the support plate 201 and the fixing frame 202; a plugging slot 10 is provided at the top end of the mounting bracket 1 and below the support plate 201, and a plurality of gaskets 204 are stacked inside the plugging slot 10, and the bottom end of the support plate 201 is plugged inside the plugging slot 10 and supported by the gaskets 204; for pipes of different heights, when the present invention is in use, the height of the support plate 201 can be adjusted by controlling the number of gaskets 204, thereby controlling the height of the fixing frame 202 and the tightening bolt 203; in addition, when the bolts between a pair of flanges block the inflation of the expansion airbag 49, the angle of the fixing frame 202 can be adjusted, and after adjustment, the angle of the fixing frame 202 is fixed by tightening the tightening bolt 203 and the tightening nut, thereby adjusting the angle of the positioning plate 21, so that the expansion of the expansion airbag 49 misses the block of the bolts; at the same time, the staff can change the shape of the expansion airbag 49, so that the expansion airbag 49 expands further in a specific direction when inflated, avoiding the interference of the bolts on the flange.

[0031] In the embodiments of the present invention, the solenoid valve and the air pump are both connected to the microcomputer, and the microcomputer is connected to the Internet, and can judge the weather conditions.

[0032] 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 principle 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 the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A methane gas concentration monitoring device, characterized in that: It includes a pair of mounting brackets 1. At the top end of the mounting bracket 1, a storage box 11 is fixedly connected. At the top end of the storage box 11, an air pump 14 is fixedly connected. The input end of the air pump 14 is communicated with the storage box 11. The output end of the air pump 14 is fixedly connected and communicated with a first solenoid valve 15. The output end of the first solenoid valve 15 is fixedly connected and communicated with an air charging pipe 151. Above the mounting bracket 1, a positioning plate 21 is provided. Between the bottom end of the positioning plate 21 and the top end of the mounting bracket 1, a pair of support members 2 are installed; One end of the air charging pipe 151 far from the first solenoid valve 15 is fixedly connected and communicated with a second solenoid valve 152. The second solenoid valve 152 is fixedly connected to the surface of the positioning plate 21. The output end of the second solenoid valve 152 penetrates through the positioning plate 21. On the side of the positioning plate 21 far from the second solenoid valve 152, a corrugated pipe 22 is fixedly connected. The output end of the second solenoid valve 152 is communicated with the corrugated pipe 22. One end of the corrugated pipe 22 far from the positioning plate 21 is fixedly connected and communicated with a docking head 23. One end of the docking head 23 far from the corrugated pipe 22 is fixedly connected and communicated with a detection head 24. On the side surface of the positioning plate 21 and inside the corrugated pipe 22, a support frame 210 is fixedly connected. On the surface of the support frame 210, a housing 5 is fixedly connected. At the end of the housing 5 far from the support frame 210, a glass cover 51 is fixedly connected; At the top end of the positioning plate 21, a hydraulic cylinder 3 is fixedly connected. The output end of the hydraulic cylinder 3 is fixedly connected with a collar 31. The collar 31 is sleeved and fixed on the surface of the docking head 23.

2. The methane gas concentration monitoring device according to claim 1, characterized in that: On the surface of the air charging pipe 151, a third solenoid valve 4 is fixedly connected and communicated. The output end of the third solenoid valve 4 is fixedly connected and communicated with a first conduit 41. One end of the first conduit 41 far from the third solenoid valve 4 is fixedly connected and communicated with a first connecting cylinder 42. One end of the first connecting cylinder 42 far from the first conduit 41 is fixedly connected and communicated with a second conduit 43. On the side surface of the first connecting cylinder 42, a third conduit 46 is fixedly connected and communicated. One end of the third conduit 46 far from the first connecting cylinder 42 is fixedly connected and communicated with a second connecting cylinder 47. At the end of the second connecting cylinder 47, a fourth conduit 48 is fixedly connected and communicated. At the upper and lower ends of the detection head 24, a pair of fixing plates 44 are symmetrically fixedly connected. On the opposite sides of the pair of fixing plates 44, an expansion airbag 49 is provided. The opening of the expansion airbag 49 is fixedly connected to the surface of the fixing plate 44. One end of the second conduit 43 far from the first connecting cylinder 42 penetrates through the fixing plate 44 at the top of the detection head 24 and is communicated with the expansion airbag 49. One end of the fourth conduit 48 far from the second connecting cylinder 47 penetrates through the fixing plate 44 at the bottom of the detection head 24 and is communicated with the expansion airbag 49; On both sides of the detection head 24, a pair of fifth solenoid valves 241 are fixedly connected. The input ends of the fifth solenoid valves 241 penetrate into the inside of the detection head 24.

3. The methane gas concentration monitoring device according to claim 2, characterized in that: Inside the expansion airbag 49, a plurality of elastic pull ropes 491 are provided. One end of the elastic pull rope 491 is fixedly connected to the surface of the fixing plate 44, and the other end is connected to the part of the expansion airbag 49 farthest from the fixing plate 44 after expansion.

4. The methane gas concentration monitoring device according to claim 2, characterized in that: A separation box 45 is fixedly connected to the surface of the fixed plate 44. When the expansion airbag 49 is not inflated, it is located inside the separation box 45. One side of the third conduit 46 away from the fixed plate 44 is estimated to be provided with a pair of flexible baffles 451, and magnetic strips are fixedly connected to the opposite sides of the pair of flexible baffles 451.

5. The methane gas concentration monitoring device according to claim 1, characterized in that: A fourth solenoid valve 12 is fixedly connected to the side of the storage box 11. The output end of the fourth solenoid valve 12 communicates with the storage box 11, and the input end of the fourth solenoid valve 12 is fixedly connected and communicated with an air extraction pump 13.

6. The methane gas concentration monitoring device according to claim 5, characterized in that: A filter screen plate is fixedly connected to the input end of the air extraction pump 13, and the filter screen plate is used for filtering the air drawn into the air extraction pump 13.

7. The methane gas concentration monitoring device according to claim 1, wherein: A partition plate 100 is fixedly connected inside the storage box 11. A pressure sensor 111 is fixedly connected to the top end of the partition plate 100, a sixth solenoid valve 112 is fixedly connected to the top end of the partition plate 100, and the input end of the sixth solenoid valve 112 penetrates through the partition plate 110.

8. A methane gas concentration monitoring device according to claim 1, characterized in that: A squeegee 6 is slidably connected to the surface of the glass cover 51. A pair of guide rods 61 are symmetrically inserted at the top end of the squeegee 6. The bottom ends of the guide rods 61 are fixedly connected to the inner wall of the docking head 23. A support spring 62 is sleeved on the surface of the guide rods 61. The top end of the support spring 62 is connected to the bottom end of the squeegee 6, and the bottom end of the support spring 62 is connected to the inner wall of the docking head 23. A pair of inclined rods 7 are arranged below the squeegee 6 inside the docking head 23. A fixing member is fixedly connected between the bottom end of the inclined rod 7 and the inner wall of the docking head 23. A sliding ring 71 is slidably connected to the surface of the inclined rod 7. A connecting rope 73 is fixedly connected between the sliding ring 71 and the end of the squeegee 6, and a wind shield 72 is fixedly connected to the surface of the sliding ring 71.

9. The methane gas concentration monitoring device according to claim 8, wherein: A nozzle 60 is fixedly connected to the bottom end of the squeegee 6. The air inlet of the nozzle 60 faces the fixed plate 21, and the air outlet of the nozzle 60 points to the connection part between the squeegee 6 and the glass cover 51.

10. The methane gas concentration monitoring device according to claim 2, wherein: The support member 2 includes a support plate 201 and a fixed frame 202; the fixed frame 202 is fixedly connected to the side surface of the positioning plate 21. A tightening nut is fixedly connected to the surface of the fixed frame 202. A tightening bolt 203 is arranged through the side surface of the support plate 201, and the tightening bolt 203 is engaged and tightened with the tightening nut for fixing the support plate 201 and the fixed frame 202; a plugging groove 10 is formed at the top end of the mounting frame 1 and below the support plate 201. A plurality of gaskets 204 are stacked inside the plugging groove 10. The bottom end of the support plate 201 is plugged inside the plugging groove 10 and supported by the gaskets 204.

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