A gas detection device

Abstract

The application provides a gas detection device, which comprises a cylinder assembly and a gas pipe assembly. The cylinder assembly comprises a first cylinder and a second cylinder. The first cylinder is arranged in the second cylinder and rotates relative to the second cylinder. The gas pipe assembly comprises a power gas channel, a first gas pipe and a second gas pipe. The first gas pipe and the second gas pipe are arranged in the second cylinder, and the end of the first gas pipe and the second gas pipe away from the second cylinder is provided with a filter screen. The power gas channel is arranged in the first cylinder and alternately communicates with the first gas pipe or the second gas pipe. The first gas pipe and the second gas pipe are used for alternately introducing air into the power gas channel to drive the power gas channel to drive the first cylinder to rotate relative to the second cylinder, so as to clean the filter screen on the first gas pipe or the second gas pipe. In the whole process, no additional power input is needed, the cleaning degree of the filter screen can be ensured, and the detection accuracy of the detection device is improved.

Description

Technical Field

[0001] This application belongs to the technical field of gas concentration detection equipment, specifically relating to a gas detection device. Background Technology

[0002] In coal mine tunneling operations, methane gas is a common hazardous gas that threatens the lives of miners. Methane detection devices used in coal mine tunneling are mainly used to monitor methane concentration in the mine. Once the methane concentration is detected to exceed the safe range, an alarm is immediately issued to remind miners to evacuate in time. However, due to the high dust levels in the mining environment, dust can easily clog the filters of methane detection devices, affecting the detection accuracy.

[0003] Although the relevant gas detection devices are designed with a filter cleaning mechanism, they rely on manually switching the inlet and outlet pipes to blow away the dust adhering to the filter using the gas that has been used for detection. While this improves the cleanliness of the filter, the manual method has limitations. It cannot achieve real-time automatic cleaning, and in emergency situations, untimely operation may affect the normal operation of the device. Therefore, it is difficult to meet the requirements of efficient, stable, and automated operation of gas detection devices in coal mine tunneling operations. Utility Model Content

[0004] Therefore, the purpose of this application is to provide a gas detection device that at least solves the technical problems mentioned in the background art.

[0005] To address the aforementioned problems, this application provides a gas detection device, comprising a cylinder assembly and a gas pipe assembly. The cylinder assembly includes a first cylinder and a second cylinder. The first cylinder is disposed within the second cylinder and rotates relative to the second cylinder. The gas pipe assembly includes a power air passage, a first gas pipe, and a second gas pipe. The first and second gas pipes are disposed within the second cylinder, and a filter screen is provided at one end of the first and second gas pipes facing away from the second cylinder. The power air passage is disposed within the first cylinder and alternately communicates with either the first or the second gas pipe. The first and second gas pipes alternately introduce air into the power air passage to drive the power air passage to rotate the first cylinder relative to the second cylinder, thereby cleaning the filter screen on the first or second gas pipe.

[0006] Optionally, the power air passage includes at least two connecting air passages and at least two arc-shaped grooves. The two arc-shaped grooves are disposed opposite each other on the upper surface of the top plate of the first cylinder. A vent hole penetrating the top plate of the first cylinder is opened at the bottom of the middle of the arc-shaped groove. The connecting air passage is inserted into the corresponding vent hole so that the connecting air passage is connected to the arc-shaped groove. The open ends of the two arc-shaped grooves are alternately connected to the first air pipe or the second air pipe.

[0007] Optionally, the connecting airway is a spiral tube.

[0008] Optionally, the top plate of the first cylinder between the two arc-shaped grooves forms a dividing area, the inner wall of the second cylinder is provided with a limiting block corresponding to the position of the dividing area, and the outer wall of the first cylinder is provided with a telescopic component that can pass over the limiting block.

[0009] Optionally, the outer wall of the first cylinder has two oppositely arranged receiving cavities at its two ends, and the telescopic component is disposed in the receiving cavity; the inner wall of the second cylinder has at least two annular grooves, the telescopic component is slidably mounted on the annular grooves, and the limiting block is disposed in the annular grooves.

[0010] Optionally, the telescopic assembly includes an elastic element and a stop, the elastic element being located within the receiving cavity, with one end connected to the bottom of the receiving cavity and the other end connected to the stop, which is at least partially located within the receiving cavity, and the stop being positioned via a shoulder of the receiving cavity.

[0011] Optionally, the cylinder assembly further includes at least two bearings disposed between the first cylinder and the second cylinder.

[0012] Optionally, the detection device further includes a miniature air pump, the air pump inlet pipe of which passes through the bottom plate of the first cylinder and is connected to one of the communicating air passages, the miniature air pump being used to draw air through the first air pipe or the second air pipe.

[0013] Optionally, the detection device further includes a detection module, wherein the detection inlet pipe of the detection module is connected to the outlet of the micro air pump, and the detection exhaust pipe of the detection module passes through the bottom plate of the first cylinder and is connected to another connecting air passage.

[0014] Optionally, the detection device further includes a housing, on which the cylinder assembly, the air tube assembly, the micro air pump, and the detection module are disposed.

[0015] By employing the above technical solution, this utility model application has at least the following beneficial effects: This application provides a gas detection device. When airflow introduced from a first or second air pipe passes through a power air passage, the airflow exerts a force on the wall of the power air passage, thereby pushing the first cylinder to rotate relative to the second cylinder. This causes the power air passage to circulate alternately with the first or second air pipe, allowing the first and second air pipes to sequentially perform air intake and exhaust operations. The exhaust airflow washes away dust adhering to the filter screen of the first or second air pipe. The entire process requires no additional power input, ensuring the cleanliness of the filter screen and improving the detection accuracy of the device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a gas detection device according to an embodiment of this application; Figure 2 This is a partial schematic diagram of the cylinder assembly and air pipe assembly according to an embodiment of this application; Figure 3 This is a schematic diagram of the first cylindrical body structure according to an embodiment of this application; Figure 4 This is a schematic diagram of the first cylindrical body according to an embodiment of this application; Figure 5 This is a schematic diagram of the internal structure of the second cylindrical portion according to an embodiment of this application; Figure 6 This is a partial schematic diagram of the first cylindrical body according to an embodiment of this application; Figure 7 Examples of embodiments of this application Figure 6 Enlarged diagram of point A.

[0017] The reference numerals in the attached figures are as follows: 1. Outer shell; 2. First trachea; 3. Second trachea; 4. Second cylinder; 41. Annular groove; 42. Limiting block; 5. Air pump inlet pipe; 6. Miniature air pump; 7. Detection module; 8. Inspect the exhaust pipe; 9. First cylinder; 91. Bearing; 92. Stop block; 93. Elastic element; 101. Arc-shaped groove; 102. Connecting airway; 103. Separated area. Detailed Implementation

[0018] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] See also Figures 1 to 7 As shown in the embodiment of this application, a gas detection device is provided, including a cylinder assembly and a gas pipe assembly. The cylinder assembly includes a first cylinder 9 and a second cylinder 4. The first cylinder 9 is disposed inside the second cylinder 4 and rotates relative to the second cylinder 4. The gas pipe assembly includes a power air passage, a first gas pipe 2, and a second gas pipe 3. The first gas pipe 2 and the second gas pipe 3 are disposed in the second cylinder 4, and a filter screen is provided at one end of the first gas pipe 2 and the second gas pipe 3 away from the second cylinder 4. The power air passage is disposed in the first cylinder 9 and alternately communicates with the first gas pipe 2 or the second gas pipe 3. The first gas pipe 2 and the second gas pipe 3 are used to alternately introduce air into the power air passage to drive the power air passage to rotate the first cylinder 9 relative to the second cylinder 4, so as to clean the filter screen on the first gas pipe 2 or the second gas pipe 3.

[0023] When the airflow introduced from the first air pipe 2 or the second air pipe 3 passes through the power air passage, the airflow exerts a force on the wall of the power air passage, thereby pushing the first cylinder 9 to rotate relative to the second cylinder 4. This causes the power air passage to alternately connect with the first air pipe 2 or the second air pipe 3, allowing the first air pipe 2 and the second air pipe 3 to perform air intake and air exhaust operations in sequence. The airflow during exhaust washes away the dust adhering to the filter screen of the first air pipe 2 or the second air pipe 3. No additional power input is required throughout the process, which ensures the cleanliness of the filter screen and also improves the detection accuracy of the detection device.

[0024] The first cylinder 9 is located inside the second cylinder 4 and rotates relative to the second cylinder 4. That is, during the mutual rotation, the second cylinder 4 is a fixed cylinder and the first cylinder 9 is a rotating cylinder. The first cylinder 9 is located inside the second cylinder 4, and the coaxiality requirement of the two should be ensured to avoid eccentricity that would prevent the first cylinder 9 from rotating relative to the second cylinder 4.

[0025] Specifically, in this embodiment, both the first cylinder 9 and the second cylinder 4 are cylindrical.

[0026] The first air pipe 2 and the second air pipe 3 are installed in the second cylinder 4. That is, the top plate of the second cylinder 4 has two through holes, which are arranged opposite each other. The inlet and outlet ends of the first air pipe 2 are inserted into one of the through holes, and the inlet and outlet ends of the second air pipe 3 are inserted into the other through hole. In use, the first air pipe 2 serves as the air inlet pipe, and the second air pipe 3 serves as the air outlet pipe after detection. Conversely, when the second air pipe 3 serves as the air inlet pipe, the first air pipe 2 serves as the air outlet pipe after detection. When either the first air pipe 2 or the second air pipe 3 serves as the air outlet pipe after detection, the filter screen on it can be cleaned.

[0027] Specifically, the first air pipe 2 and the second air pipe 3 have a funnel-shaped structure on the side away from the top plate of the second cylinder 4, which is used to increase the contact area with air and facilitate the improvement of gas collection efficiency.

[0028] Among them, the ends of the first air pipe 2 and the second air pipe 3 opposite to the second cylinder 4 are provided with filter screens. That is to say, the trumpet-shaped structure side of the first air pipe 2 and the second air pipe 3 is provided with filter screens to filter out dust in the air and improve detection accuracy.

[0029] The power air passage is located in the first cylinder 9 and is alternately connected to the first air pipe 2 or the second air pipe 3. In other words, the power air passage rotates together with the first cylinder 9, so that the power air passage is alternately connected to the first air pipe 2 or the second air pipe 3.

[0030] The filter screen is an outwardly convex spherical filter screen, and it is detachably connected to the first air pipe 2 or the second air pipe 3 to facilitate the replacement of damaged filter screens.

[0031] In another embodiment, the power air passage includes at least two connecting air passages 102 and at least two arc-shaped grooves 101. The two arc-shaped grooves 101 are disposed opposite to each other on the upper surface of the top plate of the first cylinder 9. A vent hole penetrating the top plate of the first cylinder 9 is opened at the bottom of the groove in the middle of the arc-shaped groove 101. The connecting air passages 102 are inserted into the corresponding vent holes so that the connecting air passages 102 are connected to the arc-shaped grooves 101. The open ends of the two arc-shaped grooves 101 are alternately connected to the first air pipe 2 or the second air pipe 3.

[0032] The arc-shaped groove 101 has a vent hole at the bottom of its center, penetrating the top plate of the first cylinder 9. A connecting air passage 102 is inserted into the corresponding vent hole, allowing the connecting air passage 102 to communicate with the arc-shaped groove 101. In other words, the vent hole serves two purposes: firstly, to fix the connecting air passage 102 to the top plate of the first cylinder 9, and secondly, to allow the connecting air passage 102 to communicate with the arc-shaped groove 101. The arc-shaped groove 101 increases the contact area between the connecting air passage 102 and the first air pipe 2 or the second air pipe 3.

[0033] Specifically, one connecting air passage 102 is an air intake passage, and the other connecting air passage 102 is an exhaust passage. The air intake passage is used to connect to the micro air pump 6, and the exhaust passage is used to connect to the detection module 7.

[0034] The two arc-shaped grooves 101 are alternately connected to the first air pipe 2 or the second air pipe 3 at their open ends. That is, the air intake channel is alternately connected to the first air pipe 2 or the second air pipe 3, and the exhaust channel is alternately connected to the first air pipe 2 or the second air pipe 3. In other words, when the air intake channel is connected to the first air pipe 2, the exhaust channel is connected to the second air pipe 3; conversely, when the air intake channel is connected to the second air pipe 3, the exhaust channel is connected to the first air pipe 2.

[0035] After the first cylinder 9 and the second cylinder 4 are installed, the end face of the arc-shaped groove 101 of the first cylinder 9 is in contact with the lower surface of the second cylinder 4. By selecting the materials of the two, the friction between them is very small, so as to ensure the airtightness of the two arc-shaped grooves 101 without affecting the rotation of the first cylinder 9.

[0036] Specifically, the top plate of the first cylinder 9 is made of polytetrafluoroethylene, and the top plate of the second cylinder 4 is made of stainless steel. The combination of soft, wear-resistant plastic and hard, smooth metal can automatically fill tiny gaps when they are fitted together, ensuring tightness. During rotation, the minimal friction between the two does not affect the rotation of the first cylinder 9 relative to the second cylinder 4.

[0037] In another embodiment, the connecting airway 102 is a spiral tube. When the airflow passes through the connecting airway 102, it applies a lateral thrust to the tube wall of the connecting airway 102, thereby driving the first cylinder 9 to rotate relative to the second cylinder 4. This allows the first air pipe 2 or the second air pipe 3 to alternately connect with the two arc-shaped grooves 101. The rotation of the first cylinder 9 is driven by the lateral thrust generated by the airflow, eliminating the need for additional power equipment and reducing manufacturing costs.

[0038] In another embodiment, the top plate of the first cylinder 9 between the two arc-shaped grooves 101 forms a partition region 103, the inner wall of the second cylinder 4 is provided with a limiting block 42 corresponding to the position of the partition region 103, and the outer wall of the first cylinder 9 is provided with a telescopic component that can pass over the limiting block 42.

[0039] In this design, the dividing area 103 is designed so that the two arc-shaped grooves 101 are not connected, with one passage being an intake passage and the other being an exhaust passage.

[0040] The second cylinder 4 has a limiting block 42 on its inner wall, corresponding to the position of the partition area 103. This means that if the first air tube 2 or the second air tube 3 happens to be positioned within the partition area 103, it will directly block air from entering the connecting airway 102, causing a sharp drop in air intake, making it impossible to obtain sufficient samples and reducing detection accuracy. Simultaneously, the airflow circulation is interrupted, preventing the exhaust gas from cleaning the dust on the filter screen, leading to a recurrence of filter clogging. By setting the limiting block 42, when there is no external force, the telescopic component is blocked by the limiting block 42, forcing the first air tube 2 and the second air tube 3 to connect with their respective arc-shaped grooves 101. Only when the connecting airway 102 is pushed by airflow will the telescopic component cross the limiting block 42 along its inclined surface and enter the next ventilation position, fundamentally preventing the first air tube 2 or the second air tube 3 from remaining in the partition area 103.

[0041] The inner wall of the second cylinder 4 is provided with a limiting block 42 corresponding to the position of the partition area 103. That is to say, the limiting block 42 is located directly below the partition area 103. When the telescopic component passes the limiting block 42, it will drive the first cylinder 9 to stop precisely at the position where the air pipe and the arc groove 101 are completely aligned, so that the entire switching process is free from the abruptness of instantaneous docking.

[0042] The width of the arc-shaped groove 101 matches the diameter of the first air pipe 2 or the second air pipe 3 to ensure that air can enter smoothly.

[0043] In another embodiment, the outer walls of the first cylinder 9 are respectively provided with oppositely arranged receiving cavities, and the telescopic component is disposed in the receiving cavity; the inner sidewall of the second cylinder 4 is provided with at least two annular grooves 41, the telescopic component is slidably installed on the annular grooves 41, and the limiting block 42 is disposed in the annular grooves 41.

[0044] The outer walls of the first cylinder 9 are respectively provided with oppositely arranged receiving cavities at both ends. The receiving cavities are used to provide installation space for the telescopic component and to provide movement space for the telescopic component to move, so that the telescopic component has enough movement space when it slides along the limiting block 42.

[0045] The inner wall of the second cylinder 4 is provided with at least two annular grooves 41. The telescopic component is slidably installed on the annular grooves 41. During the rotation of the first cylinder 9 relative to the second cylinder 4, the telescopic component can rotate along the annular grooves 41, which plays a guiding role for the telescopic component and prevents the telescopic component from being offset from the limiting block 42. In other words, it further ensures that the first cylinder 9 has only rotational freedom during the rotation of the second cylinder 4 and will not produce axial movement.

[0046] Specifically, the limiting block 42 is an isosceles triangle structure, and the tip of the telescopic component is transitioned by an arc. When the first cylinder 9 rotates to the point where the stop 92 of the telescopic component contacts the limiting block 42, the stop 92 will slowly slide and retract along the inclined surface of the limiting block 42, forming a buffer-type guide for the rotation of the first cylinder 9, and preventing the first cylinder 9 from jumping instantaneously due to inertia and causing misalignment.

[0047] In another embodiment, the telescopic assembly includes an elastic element 93 and a stop 92. The elastic element 93 is located within the receiving cavity, with one end connected to the bottom of the receiving cavity and the other end connected to the stop 92, which is at least partially located within the receiving cavity. The stop 92 is positioned by a shoulder of the receiving cavity.

[0048] The stop block 92 is not a fixed structure, but is slidably assembled in the annular groove 41 of the first cylinder 9, and an elastic element 93 is installed between it and the bottom of the groove. The design of the elastic element 93 enables the stop block 92 to slide in the annular groove 41 to achieve adaptive adjustment.

[0049] Specifically, the elastic element 93 is a compression spring.

[0050] The specific implementation process is as follows: When driven by an external force, when the stop block 92 contacts the limiting block 42, the elastic element 93 will contract under pressure, causing the stop block 92 to retract into the receiving groove, ensuring that the stop block 92 can slide along the limiting block 42 and smoothly pass over the limiting block 42 to complete the switching between the first air tube 2 and the second air tube 3; after passing over the limiting block 42, the elastic element 93 elastically resets, pushing the stop block 92 to re-fit against the inner wall of the annular groove 41, maintaining the stable sliding state of the stop block 92 in the annular groove 41.

[0051] Specifically, the end of the baffle 92 is designed with a spherical structure, which can greatly reduce the friction between it and the annular groove 41 and the limiting block 42, ensuring that the first cylinder 9 rotates smoothly under the thrust of the airflow and avoiding the impact of jamming on the efficiency of air tube switching.

[0052] In another embodiment, the cylinder assembly further includes at least two bearings 91 disposed between the first cylinder 9 and the second cylinder 4.

[0053] The bearing 91 is disposed between the first cylinder 9 and the second cylinder 4. That is, the inner ring of the bearing 91 is sleeved on the outer wall of the first cylinder 9, and the second cylinder 4 is sleeved on the outer ring of the bearing 91. Under the drive of external force, the first cylinder 9 rotates relative to the second cylinder 4. The bearing 91 reduces rotational friction, so that the first cylinder 9 can rotate smoothly relative to the second cylinder 4 under the drive of external force to switch the first air pipe 2 and the second air pipe 3.

[0054] Specifically, there are at least two bearings 91, arranged at both ends of the outer circumference of the first cylinder 9.

[0055] More specifically, at least two bearing limiting annular grooves are formed on the inner side wall of the second cylinder 4, and the bearings are set in the bearing limiting annular grooves of the second cylinder 4 to limit the axial position of the bearings 91. This ensures that when the first cylinder 9 rotates relative to the second cylinder 4, it only has rotational freedom and does not produce axial movement.

[0056] In another embodiment, the detection device further includes a miniature air pump 6, the bottom end of the second cylinder 4 is an open end, the air pump inlet pipe 5 of the miniature air pump 6 passes through the bottom plate of the first cylinder 9 and is connected to one of the connecting air passages 102, and the miniature air pump 6 is used to draw air through the first air pipe 2 or the second air pipe 3.

[0057] In this embodiment, the air pump inlet pipe 5 of the micro air pump 6 passes through the bottom plate of the first cylinder 9 and is connected to one of the connecting air passages 102. During the rotation of the first cylinder 9, the micro air pump 6 rotates together with the first cylinder 9. Therefore, the micro air pump 6 is fixed to the bottom end face of the first cylinder 9 by the bracket, so that the micro air pump 6 is fixed relative to the first cylinder 9, thereby making the two rotate synchronously.

[0058] The miniature air pump 6 is used to draw air through the first air pipe 2 or the second air pipe 3. That is, when the miniature air pump 6 is connected to the first air pipe 2, the first air pipe 2 is used for air intake, and the second air pipe 3 is used for air exhaust; when the miniature air pump 6 is connected to the second air pipe 3, the first air pipe 2 is used for air exhaust, and the second air pipe 3 is used for air intake.

[0059] The micro air pump 6 draws external air into the connecting airway 102 through the first air pipe 2 or the second air pipe 3. As the airflow moves within the connecting airway 102, it exerts a lateral thrust on the wall of the connecting airway 102, driving the first cylinder 9 to rotate relative to the second cylinder 4. This causes the first air pipe 2 and the second air pipe 3 to alternately connect with the micro air pump 6, thereby enabling simultaneous air intake detection and filter cleaning.

[0060] In another embodiment, the detection device further includes a detection module 7, the detection inlet of the detection module 7 is connected to the air outlet pipe of the micro air pump 6, and the detection exhaust pipe 8 of the detection module 7 passes through the bottom plate of the first cylinder 9 and is connected to another connecting air passage 102.

[0061] The detection module 7 has an air inlet pipe connected to the air outlet pipe of the micro air pump 6. In other words, the air introduced by the micro air pump 6 enters the detection module 7 through the air outlet pipe of the micro air pump 6, and the gas concentration of the air flowing through the detection module 7 is measured in real time. The air after being detected by the detection module 7 enters the connecting air passage 102 through the detection exhaust pipe 8, and alternately cleans the filter screen on the first air pipe 2 or the second air pipe 3.

[0062] More specifically, the detection module 7 is positioned below the miniature air pump 6. Both the detection module 7 and the miniature air pump 6 are fixed to the lower end face of the first cylinder 9 via the same bracket, allowing them to rotate together with the first cylinder 9. Therefore, the power supply for the miniature air pump 6 and the detection module 7 is located on the surface of the detection module 7, preventing damage to the power cord due to rotation.

[0063] In another embodiment, the detection device further includes a housing 1, a cylinder assembly, an air tube assembly, a micro air pump 6, and a detection module 7 disposed on the housing 1.

[0064] The cylinder assembly is fixed inside the outer shell 1 by the second cylinder 4, so that the outer shell 1 supports and protects the cylinder assembly, the air pipe assembly, the micro air pump 6 and the detection module 7.

[0065] The specific implementation process of the gas detection device is as follows: In the initial state (without external force), the first air pipe 2 is connected to the micro air pump 6 through the arc-shaped groove 101 and the connecting air passage 102 as an example. The micro air pump 6 generates negative pressure when it works. Outside mine air enters through the funnel-shaped opening of the first air pipe 2 and first passes through the filter screen inside the first air pipe 2 to intercept dust in the air, so as to prevent dust from entering subsequent components and affecting the detection accuracy. The filtered air continues to enter the arc-shaped groove 101 connected to the first air pipe 2, and then flows downward to the micro air pump 6 through the connecting air passage 102. After being pressurized by the micro air pump 6, it is delivered to the detection module 7. The detection module 7 detects the concentration of methane gas in the air sample and records or feeds back the detection data in real time. When the airflow passes through the connecting air passage 102, it generates thrust, driving the first cylinder 9 to rotate, thus switching the filter cleaning path. The specific process is as follows: During the testing process, air enters through the first air pipe 2 and exits through the second air pipe 3 to clean the filter. The tested air discharged from the testing module 7 flows upward through the connecting air passage 102 connected to the second air pipe 3 to the arc-shaped groove 101, and then enters the second air pipe 3. The airflow carries a certain positive pressure and flows from the inside of the second air pipe 3 to the outside, washing away the dust on the filter screen of the second air pipe 3, thus cleaning the filter screen and restoring its filtering effect.

[0066] Simultaneously, the intake airflow and exhaust airflow flow through two connecting air passages 102 respectively. Since the connecting air passage 102 is a spiral tube, the airflow will exert a circumferential tangential thrust on the tube wall when it flows along the spiral path. When the air flows downward from the upper end of the first air pipe 2 to the connecting air passage 102 connected to it, the airflow exerts a clockwise / counterclockwise tangential force on the tube wall of the connecting air passage 102. The air that has completed the detection flows upward from the detection module 7 into the other connecting air passage 102 connected to it. Since the two connecting air passages 102 have the same rotation direction, the airflow exerts a tangential force in the same direction on the two connecting air passages 102. Due to the superposition of the two tangential forces, the first cylinder 9 is driven to rotate axially around the second cylinder 4. When the first cylinder 9 rotates relative to the second cylinder 4, the retractable stop block 92 on its circumferential surface slides along the annular groove 41 on the inner wall of the second cylinder 4. When the stop block 92 contacts the isosceles triangular limiting block 42 in the annular groove 41, it is initially blocked by the limiting block 42. As the airflow thrust continues to increase, the stop block 92 compresses the elastic element 93 along the inclined surface of the limiting block 42 and successfully passes the limiting block 42. Finally, the first cylinder 9 stabilizes after rotating 180°. At this time, the second air pipe 3 is connected to the micro air pump 6 as an air inlet, and the first air pipe 2 is connected to the detection module 7 as an air outlet, realizing the switching of the docking relationship. After the switch, the first air pipe 2 is used as the exhaust passage, and the second air pipe 3 is used as the air inlet passage, officially entering the next round of detection and cleaning cycle.

[0067] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0068] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A gas detection device, characterized in that, include: A cylindrical assembly, the cylindrical assembly including a first cylindrical body (9) and a second cylindrical body (4); the first cylindrical body (9) is disposed inside the second cylindrical body (4), and the first cylindrical body (9) rotates relative to the second cylindrical body (4); The tracheal assembly includes a power airway, a first airway (2) and a second airway (3), the first airway (2) and the second airway (3) are disposed in the second cylinder (4), and a filter screen is disposed at the end of the first airway (2) and the second airway (3) away from the second cylinder (4); the power airway is disposed in the first cylinder (9), and the power airway is alternately connected to the first airway (2) or the second airway (3); The first air pipe (2) and the second air pipe (3) are used to alternately introduce air into the power air passage to drive the power air passage to rotate the first cylinder (9) relative to the second cylinder (4) to clean the filter screen on the first air pipe (2) or the second air pipe (3).

2. The gas detection device according to claim 1, characterized in that, The power air passage includes at least two connecting air passages (102) and at least two arc-shaped grooves (101). The two arc-shaped grooves (101) are disposed opposite to each other on the upper surface of the top plate of the first cylinder (9). A ventilation hole penetrating the top plate of the first cylinder (9) is opened at the bottom of the middle groove of the arc-shaped groove (101). The connecting air passages (102) are inserted into the corresponding ventilation holes so that the connecting air passages (102) are connected to the arc-shaped grooves (101). The open ends of the two arc-shaped grooves (101) are alternately connected to the first air pipe (2) or the second air pipe (3).

3. A gas detection device according to claim 2, characterized in that, The connecting airway (102) is a spiral tube.

4. A gas detection device according to claim 3, characterized in that, The top plate of the first cylinder (9) between the two arc-shaped grooves (101) forms a partition area (103). The inner wall of the second cylinder (4) is provided with a limiting block (42) corresponding to the position of the partition area (103). The outer wall of the first cylinder (9) is provided with a telescopic component that can pass over the limiting block (42).

5. A gas detection device according to claim 4, characterized in that, The first cylindrical body (9) has two oppositely arranged receiving cavities at both ends of its outer wall, and the telescopic component is disposed in the receiving cavity; the second cylindrical body (4) has at least two annular grooves (41) on its inner side wall, the telescopic component is slidably installed on the annular grooves (41), and the limiting block (42) is disposed in the annular grooves (41).

6. A gas detection device according to claim 5, characterized in that, The telescopic assembly includes an elastic element (93) and a stop (92). The elastic element (93) is located inside the receiving cavity, with one end connected to the bottom of the receiving cavity and the other end connected to the stop (92), which is at least partially located inside the receiving cavity. The stop (92) is positioned by a shoulder of the receiving cavity.

7. A gas detection device according to any one of claims 2 to 6, characterized in that, The cylinder assembly also includes at least two bearings (91) disposed between the first cylinder (9) and the second cylinder (4).

8. A gas detection device according to claim 7, characterized in that, The detection device also includes a micro air pump (6), the air pump inlet pipe (5) of the micro air pump (6) passes through the bottom plate of the first cylinder (9) and is connected to one of the connecting air passages (102), the micro air pump (6) is used to draw air through the first air pipe (2) or the second air pipe (3).

9. A gas detection device according to claim 8, characterized in that, The detection device also includes a detection module (7), the detection inlet pipe of the detection module (7) is connected to the outlet of the micro air pump (6), and the detection exhaust pipe (8) of the detection module (7) passes through the bottom plate of the first cylinder (9) and is connected to another connecting air passage (102).

10. A gas detection device according to claim 9, characterized in that, The detection device also includes a housing (1), and the cylinder assembly, the air tube assembly, the micro air pump (6) and the detection module (7) are disposed on the housing (1).

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