Gas concentration detection equipment and method for petrochemical project engineering area

Abstract

The invention discloses gas concentration detection equipment and method for a petrochemical project engineering area, and relates to the technical field of gas detection. The device comprises a gas detector, a gas delivery pipe, a micromotor, an exhaust pipe, a dust shielding umbrella and the like, a plurality of groups of fan blades with vent holes and rough surfaces are arranged on the annular side of a shaft rod in the gas delivery pipe, and a gas inlet pipe, an exhaust branch pipe and a pressure reduction branch pipe are arranged on the annular side of the gas delivery pipe. The detection method designed by the invention comprises an airflow detection and cleaning operation stage, impurities are blocked through the rough surfaces of the fan blades during detection, airflow is shunted through the vent holes, and the micro motor drives the fan blades to form vortex to discharge the impurities during cleaning. The device improves the impurity filtering effect, realizes high-efficiency automatic cleaning, guarantees the detection precision and equipment reliability, and is suitable for gas concentration detection in a petrochemical project engineering area.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas detection, and in particular to a gas concentration detection device and method for a petrochemical project engineering area. BACKGROUND

[0002] The petrochemical project engineering area (such as a refinery device area, a chemical storage tank area, etc.) is a high-risk environment for flammable, explosive, and toxic and harmful gases. There are long-term existence of gases such as methane, ethylene, and hydrogen sulfide. If the concentration of these gases exceeds the standard, it is easy to cause safety accidents such as explosion and poisoning. Therefore, real-time and accurate detection of the gas concentration in this area is a core link to ensure production safety and prevent accidents. At the same time, this area is also accompanied by impurities such as construction dust and equipment wear particles, which further increases the difficulty of gas concentration detection and puts higher requirements on the anti-interference ability of the detection equipment.

[0003] There are two major technical shortcomings in the application of current gas concentration detection equipment in this scenario, which cannot meet the actual detection needs:

[0004] First, the impurity filtering effect is poor and easy to block

[0005] Most existing detection equipment uses a "fixed filter screen" as the core component for filtering impurities in the intake air, but the filter screen is easily blocked within a short period of time, causing the equipment to be unable to intake air normally.

[0006] In order to maintain the detection function, it is necessary to frequently stop and replace the filter screen, increasing the labor and material costs of equipment operation and maintenance. In addition, some equipment does not have effective external protection structures, and rain, snow, and large particle impurities (such as construction debris) can easily enter the equipment from the intake pipe, polluting the detection elements (such as sensors), causing the sensitivity of the detection elements to drop sharply, and even directly causing the detection elements to be scrapped, further reducing the detection reliability and increasing the replacement cost of the equipment.

[0007] Second, there is a lack of efficient automatic cleaning mechanism

[0008] During the operation of the detection equipment, the inner wall of the airflow channel and the surface of the core flow guide components (such as the airflow cavity and the fan blade) are prone to accumulate residual impurities, which will continuously affect the subsequent airflow transmission efficiency and detection accuracy if not cleaned in time. The existing solutions to this problem have obvious defects:

[0009] Manual cleaning is the main method, which is high in operation cost: most equipment needs to be disassembled for cleaning, which not only consumes time and effort, but also easily damages the sealing of the equipment during disassembly and reassembly.

[0010] The cleaning function of a few devices is limited: only a few devices have simple cleaning functions, but they mostly rely on "airflow blowing" method, which cannot remove stubborn residual impurities attached to the surface of the components, and the cleaning effect is not good, and the problem of impurity accumulation will still recur.

[0011] In summary, how to design a gas detection device that can effectively filter complex impurities, ensure the accuracy of gas detection, and has high automatic cleaning capacity for petrochemical project engineering regional environment has become a key problem to be solved in the current gas detection technology field. SUMMARY

[0012] To solve the above technical problems, the present application is realized by the following technical scheme:

[0013] The present application provides a kind of gas concentration detection equipment of petrochemical project engineering area, including gas detector, the air inlet of gas detector is equipped with first electric control valve, the air outlet of gas detector is equipped with the axial flow exhaust fan of outward exhaust. The air inlet of gas detector is connected with gas pipe, and one end of gas pipe is equipped with micro motor, and the airflow cavity of gas pipe is built-in shaft rod connected with the output end of micro motor, and the fan blade of multiple groups towards the airflow of micro motor side is staggered and distributed on the ring side of shaft rod, the fan blade is provided with multiple air holes parallel to shaft rod, and the side of fan blade towards micro motor is rough surface. The ring side of gas pipe is provided with air inlet pipe with opening upward, and the air inlet pipe is equipped with second electric control valve. The ring side of gas pipe is provided with multiple exhaust branch pipes with opening downward, and multiple exhaust branch pipes are connected with exhaust pipe, and the exhaust pipe is equipped with third electric control valve.

[0014] As a preferred technical scheme of the gas concentration detection equipment of the present application: the airflow cavity of gas pipe is equipped with end disc at one end of gas detector, and bearing ring is arranged between the ring side of end disc and the inner wall of airflow cavity. End disc is provided with airflow passage, and airflow passage is connected with airflow cavity and air inlet of gas detector.

[0015] As a preferred technical scheme of the gas concentration detection equipment of the present application: the airflow cavity region between micro motor and the fan blade adjacent to it is communicated with air inlet pipe.

[0016] As a preferred technical scheme of the gas concentration detection equipment of the present application: the anti-friction spacing between fan blade and airflow cavity inner wall is reserved, and the size of anti-friction spacing is not more than 2mm. Shaft rod is equipped with at least 3 groups of staggered fan blades, the number of fan blades in the same group is not less than 3, the sum of central angle occupied by fan blades in the same group is not less than 180°, and the multiple fan blades between adjacent two groups are staggered and distributed with the same staggered angle.

[0017] As a preferred technical scheme of the gas concentration detection equipment of the present application: the airflow cavity region between adjacent two groups of fan blades is independently aligned and equipped with one exhaust branch pipe.

[0018] As a preferred technical scheme of the gas concentration detection device: the gas inlet of the gas detector is arranged below the airflow cavity region between the adjacent fan blades, and a pressure reducing branch is arranged below the airflow cavity region, the pressure reducing branch is provided with a pneumatic pressure reducing valve, the outlet of the pneumatic pressure reducing valve is arranged to face the external environment, and a detachable filter screen is arranged at the outlet of the pneumatic pressure reducing valve.

[0019] As a preferred technical scheme of the gas concentration detection device: the gas inlet of the gas detector is arranged below the airflow cavity region between the adjacent fan blades, and a pressure reducing branch is arranged below the airflow cavity region, the pressure reducing branch is provided with a pneumatic pressure reducing valve, the outlet of the pneumatic pressure reducing valve is arranged to face the external environment, and a detachable filter screen is arranged at the outlet of the pneumatic pressure reducing valve.

[0020] The application provides a gas concentration detection method for a petrochemical project engineering area.

[0021] Link one, start the detection system: open the first electric control valve of the gas inlet of the gas detector and the second electric control valve of the gas inlet pipe, and start the axial flow exhaust fan of the gas outlet of the gas detector to provide power for the external gas entering the airflow cavity.

[0022] Link two, realize preliminary purification of the airflow: after the external gas enters the airflow cavity of the gas inlet pipe, it first contacts the rough surface of the shaft ring side fan blade facing the micro motor, and the rough surface blocks the particles, dust and impurities in the airflow.

[0023] Link three, complete the airflow shunting transmission: after the airflow is affected by the rough surface, part of the airflow flows along the surface of the fan blade, and part of the airflow passes through the air hole parallel to the shaft of the fan blade and is transmitted to the direction of the gas detector.

[0024] Link four, carry out gas concentration detection: the purified and shunted airflow enters the gas inlet of the gas detector through the airflow channel of the end disc of the gas detector, and the gas detector detects the target gas concentration.

[0025] Link five, execute the exhaust of the airflow after detection: the airflow after completing the concentration detection flows out from the gas outlet of the gas detector and is directly exhausted to the external environment by the axial flow exhaust fan.

[0026] Link six, trigger the cleaning operation process: when the gas detector stops working or the single continuous working time reaches the preset value, the cleaning operation of the airflow cavity is started.

[0027] Link seven, adjust the equipment state before cleaning: close the first electric control valve and the second electric control valve, and stop the rotation of the axial flow exhaust fan to prevent impurities from entering the detector during cleaning.

[0028] Link eight, start the cleaning power device: open the third electric control valve of the exhaust pipe, and start the micro motor at one end of the gas inlet pipe, and the micro motor drives the shaft and the fan blades on the shaft to rotate synchronously.

[0029] Link nine, complete impurity vortex exhaust: the rotation of the fan blade generates a vortex in the air flow chamber towards the micro motor, and the impurities are discharged into the exhaust pipe through the exhaust branch pipe along with the vortex, and finally discharged.

[0030] Compared with the prior art, the beneficial effects of the present application are:

[0031] In the present application, a plurality of fan blades are designed to be staggered and distributed, and air holes for filtering impurities and guiding air flow are formed on the fan blades. The rough surface of the fan blade actively blocks particles and dust in the air flow, improving the impurity filtering effect and ensuring the detection accuracy and equipment reliability. At the same time, when the filter assembly needs to be cleaned, the micro motor drives the fan blade to rotate to form a vortex towards the micro motor, and cooperates with the corresponding independent exhaust branch pipe of the adjacent fan blade group to wrap and discharge the residual impurities, solving the problem of incomplete traditional air flow purging, and the periodic opening and closing of the third electric control valve enhances the air flow impact, without cleaning dead angle, without manual disassembly, avoiding damage to the sealing, realizing fast and automatic cleaning, and ensuring automatic high-precision detection operation of the gas detector. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the gas concentration detection device of the present application.

[0033] Figure 2 It is Figure 1 It is a structure schematic diagram of the local enlargement of A.

[0034] Figure 3 It is a schematic diagram of the air flow state when the gas concentration detection device of the present application is in the air inlet detection.

[0035] Figure 4 It is a schematic diagram of the air flow state when the gas concentration detection device of the present application is in the cleaning.

[0036] Figure 5 It is a schematic diagram of the logic flow of the gas concentration detection method of the present application.

[0037] Wherein: 1-gas detector, 101-air inlet, 102-first electric control valve, 103-axial exhaust fan; 2-gas conveying pipe, 201-air flow chamber, 202-air inlet pipe, 2021-second electric control valve, 203-decompression branch pipe, 204-pneumatic pressure reducing valve, 205-filter screen, 206-shaft, 207-fan blade, 2071-air hole, 2072-rough surface, 208-end disc, 2081-air flow channel, 209-bearing ring, 210-exhaust branch pipe; 3-micro motor; 4-exhaust pipe; 5-third electric control valve; 6-dustproof umbrella. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0039] Embodiment one, as Figure 1 The gas concentration detection device of the present application mainly consists of a gas detector 1, a gas conveying pipe 2, a micro motor 3, an exhaust pipe 4, a third electric control valve 5, a dust-shielding umbrella 6 and various types of branch pipes, valve pieces and internal components. The connection relationship, functions and parameters of each structure are as follows:

[0040] The gas detector 1 is the core detection component of the device, which is used for detecting the concentration of the incoming gas flow. Its structure configuration is as follows:

[0041] As Figure 1 , Figure 2 The first electric control valve 102 is fixedly installed at the gas inlet 101 of the gas detector 1, which is used for controlling the on-off of the gas inlet 101, thereby regulating the gas flow entering the gas detector 1. The axial flow exhaust fan 103 is installed at the gas outlet of the gas detector 1, which can exhaust air outward to form a gas flow power, assisting the gas flow to enter from the gas inlet 101 and then be discharged through the gas outlet, while ensuring the smooth flow of the gas flow in the gas detector 1.

[0042] As Figure 1 , Figure 2 The gas conveying pipe 2 is the core channel for gas flow transmission, which forms a closed gas flow cavity 201 inside. The two ends and the ring side of the gas conveying pipe 2 are connected with multiple functional components, and the inside is also provided with components for impurity blocking and gas flow guiding, which are as follows:

[0043] As Figure 1 , Figure 2 One end of the gas conveying pipe 2 is fixedly connected with the micro motor 3. The gas flow cavity 201 inside the gas conveying pipe 2 is provided with a shaft 206, one end of which is coaxially connected with the output end of the micro motor 3. When the micro motor 3 is started, it can drive the shaft 206 to rotate synchronously.

[0044] As Figure 2The ring side of the shaft rod 206 is staggered with multiple groups of fan blades 207, the fan blades 207 are fixedly connected with the shaft rod 206 and synchronously rotate with the shaft rod 206, wherein the specific parameter requirements of the fan blades 207 are as follows: a friction-preventing spacing is reserved between the fan blades 207 and the inner wall of the airflow cavity 201, the size of the spacing is not greater than 2 mm, so as to avoid friction damage of the fan blades 207 to the inner wall of the airflow cavity 201 during rotation. At least three groups of staggered fan blades 207 are arranged on the shaft rod 206, the number of fan blades 207 in the same group is not less than three, the sum of the central angles occupied by the fan blades 207 in the same group is not less than 180°, the multiple fan blades 207 between the adjacent two groups are staggered and the staggered angle is the same, so as to ensure uniform airflow guiding. A plurality of air holes 2071 parallel to the shaft rod 206 are formed in the fan blades 207, the air holes 2071 are used for airflow passing through, so as to realize airflow shunting and guiding. Figure 1 The side of the fan blades 207 facing the micro motor 3 is a rough surface 2072, the rough surface 2072 is used to more easily block the impurities such as particles and dust in the airflow, so as to avoid the impurities entering the gas detector 1 along with the airflow.

[0045] As shown in Figure 1 The ring side of the gas conveying pipe 2 is provided with an air inlet pipe 202 opening upward, the air inlet pipe 202 is in communication with the airflow cavity 201 of the gas conveying pipe 2, a second electric control valve 2021 is arranged on the air inlet pipe 202, the second electric control valve 2021 is used to control the opening and closing of the air inlet pipe 202 and regulate the external gas entering the airflow cavity 201. In addition, a dust-shielding umbrella 6 is arranged at the top of the air inlet pipe 202, the diameter size of the dust-shielding umbrella 6 is greater than the size of the upward opening of the air inlet pipe 202, so as to block the external dust and sundries directly falling into the air inlet pipe 202 and reduce the impurities entering the airflow cavity 201.

[0046] As shown in Figure 1 , Figure 2 The ring side of the gas conveying pipe 2 is also provided with multiple air outlet branch pipes 210 opening downward, one end of the multiple air outlet branch pipes 210 is in communication with the airflow cavity 201 of the gas conveying pipe 2, the other end is commonly connected with an air outlet pipe 4, a third electric control valve 5 is arranged on the air outlet pipe 4, the third electric control valve 5 is used to control the opening and closing of the air outlet pipe 4 and regulate the impurities in the airflow cavity 201 being discharged along with the airflow, and an air outlet branch pipe 210 is independently and aligned arranged in the region of the airflow cavity 201 between the adjacent two groups of fan blades 207, so as to ensure that the impurities near each group of fan blades 207 can be quickly discharged through the corresponding air outlet branch pipe 210.

[0047] As shown in Figure 1 , Figure 2, the airflow cavity 201 of the gas conveying pipe 2 is provided with an end disc 208 at one end of the gas detector 1, and the end disc 208 is fixedly connected with the inner wall of the airflow cavity 201. A bearing ring 209 is arranged between the ring side of the end disc 208 and the inner wall of the airflow cavity 201, and the bearing ring 209 is used to ensure the stability of the shaft rod 206 during rotation and reduce friction. The end disc 208 is provided with an airflow channel 2081, one end of the airflow channel 2081 is communicated with the airflow cavity 201, and the other end is communicated with the gas inlet 101 of the gas detector 1, so that the airflow in the airflow cavity 201 is transmitted to the gas detector 1.

[0048] As Figure 1 , Figure 2 , the gas inlet 101 of the gas detector 1 is provided with a pressure reduction branch pipe 203 below the airflow cavity 201 region between the adjacent group of blades 207, and the pressure reduction branch pipe 203 is communicated with the airflow cavity 201. The pressure reduction branch pipe 203 is provided with a pneumatic pressure reduction valve 204, and the gas outlet of the pneumatic pressure reduction valve 204 is directed to the outside environment, which is used to balance the air pressure in the airflow cavity 201; and a detachable filter screen 205 is arranged at the gas outlet of the pneumatic pressure reduction valve 204, which is used to filter the air entering the airflow cavity 201 from the outside environment to prevent impurities from entering.

[0049] As Figure 1 , Figure 2 , the airflow cavity 201 region between the micro motor 3 and the adjacent group of blades 207 is communicated with the air inlet pipe 202, so that after the outside gas enters the airflow cavity 201, it can first pass through the rough surface 2072 of the blade 207 to block impurities, and then flow to the direction of the gas detector 1 (and will also pass through the downstream side of the blade 207 in the process).

[0050] In the second embodiment, the detection method designed by the present application mainly includes an airflow detection stage and a cleaning operation stage, and the specific steps are as follows:

[0051] S1. Airflow detection stage (combined with Figure 1 , Figure 2 , Figure 3 )

[0052] S1.1. Open the control component: open the first electric control valve 102 and the second electric control valve 2021, and start the axial exhaust fan 103. The axial exhaust fan 103 works to generate negative pressure, guiding the outside air to enter the airflow cavity 201 of the gas conveying pipe 2 from the air inlet pipe 202.

[0053] S1.2. Airflow impurity blocking: most of the airflow entering the airflow cavity 201 passes through the blades 207 which are not started in the detection stage, flows along the rough surface 2072 of the surface of the blade 207, and the particles, dust and other impurities in the airflow are blocked in the airflow cavity 201 by the rough surface 2072. At the same time, part of the airflow passes through the air holes 2071 on the blades 207 and flows to the direction of the gas detector 1.

[0054] S1.3. Gas detection and exhaust: the gas flow blocked by impurities enters the gas inlet 101 of the gas detector 1 through the gas flow channel 2081 on the end disc 208, and the gas detector 1 detects the concentration of the target gas in the gas flow. After detection, the gas flow is discharged from the gas outlet of the gas detector 1 and is discharged to the outside through the axial exhaust fan 103.

[0055] S2. Cleaning operation stage (combined with Figure 1 、 Figure 2 、 Figure 4 )

[0056] S2.1. Triggering condition of cleaning operation: when the gas detector 1 stops working, or the single continuous working time of the gas detector 1 reaches the system preset time, the cleaning operation is started, and the steps are as follows:

[0057] S2.2. Turn off irrelevant components: turn off the first electric control valve 102, the second electric control valve 2021, and stop the rotation of the axial exhaust fan 103 to avoid impurities entering the gas detector 1 or diffusing outward during the cleaning process;

[0058] S2.3. Start cleaning power: open the third electric control valve 5 and start the micro motor 3, which drives the shaft rod 206 and the multiple sets of fan blades 207 on the shaft rod 206 to rotate synchronously.

[0059] S2.4. Impurity discharge: the rotation of the fan blades 207 causes vortex of the gas in the gas flow cavity 201, and the vortex flows towards the micro motor 3. The particles, dust and other impurities blocked by the rough surface 2072 in the gas flow cavity 201 flow synchronously with the vortex, enter the exhaust pipe 4 through the exhaust branch pipe 210, and are finally discharged from the exhaust pipe 4.

[0060] S2.5. Air pressure balance and air supplement: during the exhaust process of the rotation of the fan blades 207, negative pressure is generated in the gas flow cavity 201, and the pneumatic pressure reducing valve 204 automatically acts. The air outside the filter net 205 is filtered and enters the gas flow cavity 201, balancing the air pressure in the gas flow cavity 201, while preventing external impurities from entering.

[0061] S2.6. Enhance cleaning effect: to enhance the mixing and impact effect of the gas flow in the gas flow cavity 201, the third electric control valve 5 is opened and closed according to periodic rules, for example, the third electric control valve 5 is opened for 15 seconds and closed for 5 seconds, and the cycle is repeated to ensure that the impurities in each area of the gas flow cavity 201 can be fully carried out.

[0062] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A gas concentration detection device for a petrochemical project engineering area, characterized in that: The gas detector (1) includes a gas detector (1), the gas detector (1) is equipped with a first electrically controlled valve (102) at its air inlet (101), and the gas detector (1) is equipped with an axial flow exhaust fan (103) for exhausting gas outwards at its air outlet. The gas detector (1) has an air inlet (101) connected to a gas delivery pipe (2). One end of the gas delivery pipe (2) is equipped with a micro motor (3). The airflow chamber (201) of the gas delivery pipe (2) contains a shaft (206) connected to the output end of the micro motor (3). The shaft (206) has multiple sets of fan blades (207) that blow airflow toward the micro motor (3) on its circumferential side. The fan blades (207) have multiple ventilation holes (2071) parallel to the shaft (206). The side of the fan blades (207) facing the micro motor (3) is a rough surface (2072). The gas pipeline (2) is provided with an upward-opening air inlet pipe (202) on the annular side, and the air inlet pipe (202) is equipped with a second electrically controlled valve (2021). The gas supply pipe (2) is provided with multiple downward-facing exhaust branch pipes (210) on the ring side, and the multiple exhaust branch pipes (210) are connected to the exhaust pipe (4). The exhaust pipe (4) is equipped with a third electric control valve (5).

2. The gas concentration detection device for a petrochemical project engineering area according to claim 1, characterized in that: The gas transmission pipe (2) has an end plate (208) at one end of the gas detector (1) near the gas chamber (201). A bearing ring (209) is provided between the circumferential side of the end plate (208) and the inner wall of the gas chamber (201). The end plate (208) has an airflow channel (2081) which connects the airflow chamber (201) with the air inlet (101) of the gas detector (1).

3. The gas concentration detection device for a petrochemical project engineering area according to claim 1, characterized in that: The micro motor (3) is connected to the air intake pipe (202) in the airflow cavity (201) region between itself and a set of adjacent fan blades (207).

4. The gas concentration detection device for a petrochemical project engineering area according to claim 1, characterized in that: A friction-resistant gap is reserved between the fan blade (207) and the inner wall of the airflow cavity (201), and the size of the friction-resistant gap is no greater than 2mm; The shaft (206) is equipped with at least 3 sets of staggered fan blades (207), with no less than 3 fan blades (207) in the same set, and the total central angle occupied by the fan blades (207) in the same set is no less than 180°, and the multiple fan blades (207) in two adjacent sets are staggered and the staggered angles are the same.

5. A gas concentration detection device for a petrochemical project engineering area according to claim 1, characterized in that: Each airflow cavity (201) region between two adjacent sets of fan blades (207) is independently aligned with an exhaust branch pipe (210).

6. A gas concentration detection device for a petrochemical project engineering area according to claim 1, characterized in that: The gas detector (1) has a pressure reducing branch pipe (203) located directly below the airflow cavity (201) area between its air inlet (101) and an adjacent set of fan blades (207). The pressure reducing branch pipe (203) is equipped with a pneumatic pressure reducing valve (204). The outlet of the pneumatic pressure reducing valve (204) faces the external environment. The outlet of the pneumatic pressure reducing valve (204) is equipped with a removable filter screen (205).

7. A gas concentration detection device for a petrochemical project engineering area according to claim 1, characterized in that: The top of the air intake pipe (202) is equipped with a dust cover (6) with a diameter larger than its upward opening size.

8. A method for detecting gas concentration in a petrochemical project engineering area, characterized in that, A gas concentration detection device applied to a petrochemical project engineering area according to any one of claims 1 to 7, comprising the following: Step 1: Open the first solenoid valve (102) of the gas detector (1) inlet (101) and the second solenoid valve (2021) of the gas pipe (2) ring side inlet pipe (202), and at the same time start the axial flow exhaust fan (103) of the gas detector (1) outlet to provide power for the outside gas to enter the airflow chamber (201); Step 2: After the external gas enters the airflow chamber (201) of the gas delivery pipe (2) through the air inlet pipe (202), it first contacts the rough surface (2072) of the fan blade (207) on the side of the shaft (206) facing the micro motor (3). The rough surface (2072) blocks particles, dust and impurities in the airflow. In step three, after the airflow acts on the rough surface (2072), part of it flows along the surface of the fan blade (207), and part of it is transmitted to the gas detector (1) through the ventilation hole (2071) on the fan blade (207) parallel to the shaft (206); Step 4: The purified and diverted airflow enters the inlet (101) of the gas detector (1), and the gas detector (1) detects the concentration of the target gas. Step 5: The airflow that has completed the concentration detection flows out from the outlet of the gas detector (1) and is directly discharged to the external environment by the axial flow exhaust fan (103); Step 6: When the gas detector (1) stops working, or when its single continuous working time reaches the preset value, start the cleaning operation of the airflow chamber (201); Step 7: Close the first solenoid valve (102) and the second solenoid valve (2021) to stop the rotation of the axial flow exhaust fan (103) and prevent impurities from entering the gas detector (1) during cleaning. Step 8: Open the third electric control valve (5) of the exhaust pipe (4) and start the micro motor (3) at one end of the gas supply pipe (2). The micro motor (3) drives the shaft (206) and the fan blade (207) on the shaft (206) to rotate synchronously. Step 9: The rotation of the fan blade (207) generates a vortex in the airflow chamber (201) that moves toward the micro motor (3). Impurities are carried by the vortex through the exhaust branch pipe (210) into the exhaust pipe (4) and are eventually discharged.

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