An air flow sensor and assembly for preventing smoke backflow

Abstract

The present invention relates to the technical field of airflow detection, and discloses an airflow sensor and its components for preventing smoke backflow. The key points of its technical solution are: a smoke conveying component of an airflow sensor, including the above-mentioned smoke conveying component, characterized in that the smoke conveying component includes: two smoke collecting boxes arranged in an airflow channel; a connecting plate arranged in the airflow channel, a detection port is opened on the connecting plate, and an airflow sensor is arranged in the detection port; while ensuring uninterrupted ventilation, the detection port and the airflow sensor can be cleaned by using the air entering from the cleaning port and the cleaning port, ensuring that no smoke will remain on the detection port and the airflow sensor during the next detection, avoiding affecting the detection. Compared with the sensors and their components in the prior art, the present application can solve the problem that when the ventilation system or smoke exhaust equipment is unstable, smoke may flow back into the sensor and affect the accuracy of the sensor.

Description

Technical Field

[0001] The invention relates to the technical field of airflow detection, and in particular to an airflow sensor and a component thereof for preventing smoke backflow. Background Art

[0002] Air quality monitoring and management are gaining more and more attention in industrial, commercial and domestic environments. Smoke, dust and other pollutants in the air not only affect people's health, but may also cause equipment damage and reduced work efficiency.

[0003] Traditional airflow sensors are mainly used to monitor parameters such as particulate matter concentration, temperature and humidity in the air. These sensors are usually installed in ventilation systems, air purification equipment and smoke alarm systems to provide real-time air quality data. However, existing airflow sensors have the problem of smoke backflow during use. In some cases, such as when the ventilation system or smoke exhaust equipment is not working properly, smoke may flow back into the sensor, which will not only affect the accuracy of the sensor, but may also cause damage to the sensor. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an airflow sensor and a component thereof for preventing smoke backflow, aiming to alleviate the above-mentioned problems at least to a certain extent.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] An air flow sensor assembly, comprising:

[0007] An air flow channel, and an air flow sensor disposed in the air flow channel;

[0008] A smoke delivery component disposed between the airflow channel and the airflow sensor, for delivering gas to the airflow sensor;

[0009] The smoke conveying component can prevent the smoke from flowing back after conveying the airflow through the airflow sensor.

[0010] The smoke delivery assembly comprises:

[0011] Two smoke collecting boxes arranged in the air flow channel;

[0012] A connecting plate arranged in the airflow channel, wherein a detection port is provided on the connecting plate, and an airflow sensor is arranged in the detection port;

[0013] A push pipe is arranged between the smoke collecting box and the connecting plate, the push pipes on the two smoke collecting boxes are arranged opposite to each other, one end of the push pipe passes through the connecting plate, a Venturi channel is connected between the detection port and the push pipe, a cleaning port is opened on the side of the airflow channel, and a cleaning port connected to the cleaning port is opened on the push pipe;

[0014] A smoke collecting part disposed in the smoke collecting box body, used for absorbing smoke at the air inlet of the air flow channel;

[0015] A blasting portion disposed in the air flow channel, used to extract gas in the push tube;

[0016] Wherein, when the blasting part extracts the gas in the push pipe, it can intermittently extract the smoke at the air inlet of the airflow channel through the smoke collecting parts in the two smoke collecting boxes, and when one of the smoke collecting boxes is absorbing the smoke, the other smoke collecting box can release the smoke into the detection port, and the smoke is released when the pressure in the smoke collecting box increases to a preset value;

[0017] Wherein, the smoke collecting unit can push the gas in the pushing pipe when absorbing smoke.

[0018] Preferably, the smoke collecting part includes a fixed plate and a sliding plate arranged in the smoke collecting box, the fixed plate is fixed in the smoke collecting box, an air bag is connected between the fixed plate and the sliding plate, a first one-way valve mechanism is provided on one side of the fixed plate, the first one-way valve mechanism is used for air intake, a delivery pipe connected to the smoke collecting box, the other end of the delivery pipe is connected to the connecting plate and connected to the detection port, one end of the delivery pipe located in the detection port is provided with a second one-way valve mechanism, the second one-way valve mechanism is used for air exhaust.

[0019] Preferably, the first one-way valve mechanism and the second one-way valve mechanism have the same structure, the first one-way valve mechanism includes a connecting pipe connected to one side of the fixed plate and connected to the air inlet of the airflow channel, a first bracket is connected in the connecting pipe, and the second one-way valve mechanism includes a second bracket connected to one end of the delivery pipe located in the detection port; wherein, one end of the first bracket and the second bracket are connected with a baffle via a spring telescopic rod, one side of the baffle is connected to a sliding tube, and a plurality of ventilation holes are opened on the outer wall of the sliding tube.

[0020] Preferably, a frame is connected inside the detection port, the airflow sensor is connected to the frame, and a closing plate is connected to one side of the frame.

[0021] Preferably, the blowing part includes a first shaft connected to the air flow channel, and an exhaust fan is provided on the first shaft.

[0022] Preferably, a second shaft is connected to one side of the smoke collecting box body, a first gear is connected to the second shaft, a third shaft is connected to the frame body, two ends of the third shaft are respectively connected to the second gear and the third gear, the second gear is meshed with the first gear, the first shaft is connected to a fourth gear meshed with the third gear, a reciprocating screw is rotatably connected to the smoke collecting box body, a connecting frame connected to the sliding plate is threadedly connected to the reciprocating screw, and a chain transmission mechanism is connected between the second shaft and the reciprocating screw.

[0023] Preferably, a ratchet mechanism is connected between the first shaft and the fourth gear.

[0024] Preferably, a motor is connected to the smoke collecting box, and a chain transmission mechanism is also provided between the driving shaft of the motor and the second shaft.

[0025] In summary, the present invention mainly has the following beneficial effects:

[0026] By setting up the air flow channel, the operator can connect the smoke exhaust pipe of the smoke to the air inlet of the air flow channel, and the smoke can reach one side of the air flow channel. When in use, the blowing part can be opened, and the blowing part can extract the gas in the push pipe. When the blowing part is working, it can make the smoke collecting parts in the two smoke collecting boxes work. When one of the smoke collecting boxes absorbs the smoke, the other smoke collecting box releases the smoke in it into the detection port. That is, there is always one smoke collecting box absorbing the smoke, and the other smoke collecting box releases the smoke into the detection port, and the smoke is detected by the set air flow sensor, which ensures uninterrupted detection of smoke and uninterrupted absorption of smoke for ventilation, and the smoke can also be detected in batches. The detection accuracy of smoke is effectively improved. When the blower is working, it can absorb the air in the push tube. When the air flows in the push tube, it can absorb the gas in the detection port through the Venturi effect. After the smoke passes through the airflow sensor in the detection port, it can enter the push tube through the Venturi channel and follow the gas in the push tube to be discharged through the airflow channel through the blower, ensuring that the smoke will not stay in the detection port. After the smoke passes through the airflow sensor, the air continuously flowing in the push tube ensures that the smoke will not flow back to the airflow sensor and affect the airflow sensor. Furthermore, when one of the smoke collecting boxes releases smoke, the smoke blows toward the detection port, and the other smoke collecting box absorbs the smoke. When the smoke is released from the other smoke collecting box, most of the smoke can flow out from the Venturi channel with a faster gas flow rate, ensuring that the smoke can pass through the airflow sensor, and the airflow sensor can accurately detect the substances in the smoke, thereby avoiding the problem that most of the smoke flows out along the edge of the airflow sensor and cannot be detected when the push tube extracts the air in the Venturi channel. Furthermore, the smoke in the smoke collecting box can be released only when the pressure increases to a preset value, that is, when the smoke collecting part absorbs the smoke. After the smoke is released, the pressure value inside it is currently handed over. When releasing the smoke, the smoke collecting box needs to be pressurized. During the pressurization process, it will not affect the other smoke collecting box to absorb smoke. In this process, no smoke will be released into the detection port, which can ensure uninterrupted ventilation. At the same time, the air entering from the cleaning port and the cleaning port can be used to clean the detection port and the airflow sensor, ensuring that there will be no smoke residue on the detection port and the airflow sensor during the next detection, avoiding affecting the detection. Compared with the sensors and their components in the prior art, the present application can solve the problem that when the ventilation system or smoke exhaust equipment is unstable, the smoke may flow back into the sensor and affect the accuracy of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 is a schematic diagram of the airflow channel structure of the present invention;

[0029] Figure 3 yes Figure 2 A schematic diagram of the enlarged local structure at point A in the middle;

[0030] Figure 4 It is a schematic diagram of the push tube structure of the present invention;

[0031] Figure 5 It is a schematic diagram of the smoke collecting box structure of the present invention;

[0032] Figure 6 It is a schematic diagram of the one-way valve mechanism structure of the present invention;

[0033] Figure 7 It is a schematic diagram of the structure of the blast part of the present invention.

[0034] Reference numerals:

[0035] 100, airflow channel; 101, airflow sensor; 102, smoke collecting box; 103, connecting plate; 104, detection port; 105, push pipe; 106, Venturi channel; 107, cleaning port; 108, cleaning port;

[0036] 200, fixed plate; 201, sliding plate; 202, airbag; 203, one-way valve mechanism; 204, delivery pipe; 205, connecting pipe; 206, first bracket; 207, second bracket; 208, baffle; 209, sliding pipe; 210, vent;

[0037] 300, frame; 301, closing plate;

[0038] 400, first shaft; 401, exhaust fan; 402, second shaft; 403, first gear; 404, third shaft; 405, second gear; 406, third gear; 407, fourth gear; 408, reciprocating screw; 409, connecting frame; 410, chain transmission mechanism; 411, ratchet mechanism; 412, motor. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] refer to Figure 1-Figure 7 , an airflow sensor assembly, comprising:

[0041] An air flow channel 100, and an air flow sensor 101 disposed in the air flow channel 100;

[0042] The smoke delivery component is provided between the airflow channel 100 and the airflow sensor 101, and is used to deliver the gas to the airflow sensor 101;

[0043] The smoke delivery component can prevent the smoke from flowing back after delivering the airflow through the airflow sensor 101. The smoke delivery component includes:

[0044] Two smoke collecting boxes 102 are arranged in the air flow channel 100;

[0045] A connecting plate 103 is disposed in the airflow channel 100, a detection port 104 is opened on the connecting plate 103, and the airflow sensor 101 is disposed in the detection port 104;

[0046] A push pipe 105 is arranged between the smoke collecting box 102 and the connecting plate 103. The push pipes 105 on the two smoke collecting boxes 102 are arranged opposite to each other. One end of the push pipe 105 passes through the connecting plate 103. A venturi channel 106 is connected between the detection port 104 and the push pipe 105. A cleaning port 107 is opened on the side of the airflow channel 100. A cleaning port 108 connected to the cleaning port 107 is opened on the push pipe 105.

[0047] The smoke collecting part provided in the smoke collecting box 102 is used to absorb the smoke at the air inlet of the air flow channel 100;

[0048] The blowing part provided in the air flow channel 100 is used to extract the gas in the push pipe 105;

[0049] Among them, when the air blowing part extracts the gas in the push tube 105, it can intermittently extract the smoke at the air inlet of the air flow channel 100 through the smoke collecting parts in the two smoke collecting boxes 102. When one of the smoke collecting boxes 102 is absorbing smoke, the other smoke collecting box 102 can release the smoke into the detection port 104. When the pressure in the smoke collecting box 102 increases to a preset value, the smoke is released;

[0050] The smoke collecting unit can push the gas in the push pipe 105 when absorbing smoke;

[0051] By setting up the airflow channel 100, the operator can connect the smoke exhaust pipe of the smoke to the air inlet of the airflow channel 100, and the smoke can reach one side of the airflow channel 100. When in use, the blowing part can be opened, and the blowing part can extract the gas in the push tube 105. When the blowing part is working, it can make the smoke collecting parts in the two smoke collecting boxes 102 work. When one of the smoke collecting boxes 102 absorbs the smoke, the other smoke collecting box 102 releases the smoke in it into the detection port 104, that is, there is always one smoke collecting box 102 absorbing the smoke, and the other smoke collecting box 102 releases the smoke into the detection port 104. The smoke is detected by the set airflow sensor 101, which ensures uninterrupted detection of smoke and uninterrupted absorption of smoke for ventilation. The smoke can also be detected in batches, which effectively improves the accuracy of smoke detection. When the blower is working, it can absorb the air in the push tube 105. When the air flows in the push tube 105, it can absorb the gas in the detection port 104 through the Venturi effect. After the smoke passes through the airflow sensor 101 in the detection port 104, it can enter the push tube 105 through the Venturi channel 106, and follow the gas in the push tube 105 to be discharged through the airflow channel 100 through the blower, ensuring that the smoke will not stay in the detection port 104, and after the smoke passes through the airflow sensor 101, the air continuously flows in the push tube 105, ensuring that the smoke will not flow back to the airflow sensor 101 and affect the airflow sensor 101. Further, When one of the smoke collecting boxes 102 releases smoke, the smoke blows toward the detection port 104, and the other smoke collecting box 102 can push the gas in the push tube 105 when absorbing smoke. The gas flow rate in one of the push tubes 105 will increase relative to the other push tube 105, that is, the air flow rate in one of the venturi channels 106 will increase. When the other smoke collecting box 102 releases smoke, most of the smoke can flow out from the venturi channel 106 with a faster gas flow rate, ensuring that the smoke can pass through the airflow sensor 101. The purpose of the airflow sensor 101 to accurately detect the substances in the smoke is avoided, and most of the smoke flows along the airflow sensor 101 when the push tube 105 extracts the air in the venturi channel 106. The problem of smoke flowing out of the edge and being unable to be detected is solved. Furthermore, the smoke in the smoke collecting box 102 can be released only when the pressure increase value in the smoke collecting box 102 reaches a preset value. That is, after the smoke collecting part absorbs the smoke, the pressure value in the smoke collecting box 102 is currently set. When releasing the smoke, the smoke collecting box 102 needs to be pressurized. During the pressurization process, it will not affect the absorption of smoke by another smoke collecting box 102. During this process, no smoke will be released into the detection port 104, which can ensure uninterrupted ventilation. The air entering from the cleaning port 107 and the cleaning port 108 can also be used to clean the detection port 104 and the airflow sensor 101, ensuring that no smoke will remain on the detection port 104 and the airflow sensor 101 during the next detection, thereby avoiding affecting the detection.Compared with the sensors and their components in the prior art, the present application can solve the problem that when the ventilation system or smoke exhaust equipment is unstable, smoke may flow back into the sensor, affecting the accuracy of the sensor.

[0052] As a further solution of the present invention, the smoke collecting unit includes a fixed plate 200 and a sliding plate 201 arranged in the smoke collecting box 102, the fixed plate 200 is fixed in the smoke collecting box 102, an air bag 202 is connected between the fixed plate 200 and the sliding plate 201, a first one-way valve mechanism 203 is provided on one side of the fixed plate 200, the first one-way valve mechanism 203 is used for air intake, a delivery pipe 204 connected to the smoke collecting box 102, the other end of the delivery pipe 204 is connected to the connecting plate 103 and is connected to the detection port 104, and a second one-way valve mechanism 203 is provided at one end of the delivery pipe 204 located in the detection port 104, and the second one-way valve mechanism 203 is used for air outlet;

[0053] By setting the sliding plate 201, when in use, the sliding plate 201 in one of the smoke collecting boxes 102 is at the extreme position on the left, and the sliding plate 201 in the other smoke collecting box 102 is at the extreme position on the right. When working, the sliding plates 201 in the two smoke collecting boxes 102 can be moved synchronously, one to increase the distance between the fixed plate 200 and stretch the air bag 202 to let in air through the first one-way valve mechanism 203, and the other to shorten the distance between the fixed plate 200 to compress the air bag 202, forcing the smoke to be discharged through the delivery pipe 204 and the second one-way valve mechanism 203 on the delivery pipe 204, thereby achieving the purpose of allowing one of the smoke collecting boxes 102 to extract smoke while the other smoke collecting box 102 releases smoke.

[0054] As a further solution of the present invention, the first one-way valve mechanism 203 and the second one-way valve mechanism 203 have the same structure. The first one-way valve mechanism 203 includes a connecting pipe 205 connected to one side of the fixing plate 200 and communicating with the air inlet of the airflow channel 100, and a first bracket 206 is connected to the connecting pipe 205; the second one-way valve mechanism includes a second bracket 207 connected to one end of the delivery pipe 204 located in the detection port 104; one end of the first bracket 206 and the second bracket 207 are connected to a baffle 208 through a spring telescopic rod, and one side of the baffle 208 is connected to a sliding tube 209, and the outer wall of the sliding tube 209 is provided with a plurality of ventilation holes 210;

[0055] By setting a spring telescopic rod, the spring telescopic rod can limit the position of the baffle 208. When the sliding plate 201 moves away from the fixed plate 200, negative pressure is generated in the airbag 202. The negative pressure can force the baffle 208 on the connecting pipe 205 to move, so that the spring telescopic rod generates potential energy. The baffle 208 moves, and the smoke can enter the airbag 202 from the gap between the baffle 208 and the connecting pipe 205, so as to achieve the purpose of extracting smoke. When the sliding plate 201 moves close to the fixed plate 200, positive pressure can be generated in the airbag 202, and the pressurization can force the smoke to press the delivery pipe 204. The baffle 208 on the upper part is displaced, and the smoke can enter the detection port 104 from the gap between the baffle 208 and the delivery pipe 204, thereby achieving the purpose of releasing the smoke. Furthermore, when the sliding plate 201 moves close to the fixed plate 200 to compress the airbag 202, the airbag 202 is ductile, which will cause the incompletely inflated airbag 202 to deform and expand further until the airbag 202 is extended to the limit. After the preset pressure is generated in the smoke collecting box 102, the baffle 208 is displaced. During this process, the smoke will not flow to the detection port 104, and the other smoke collecting box 102 will be compressed. The sliding plate 201 in the box body 102 is moving away from the fixed plate 200, and the smoke will not flow into the detection port 104. This time period is used to allow the clean gas to flow into the detection port 104 to clean the smoke in the detection port 104. Furthermore, when the sliding plate 201 in one of the smoke collecting boxes 102 moves away from the fixed plate 200 to absorb the smoke, the other smoke collecting box body 102 releases the smoke. Because the push pipes 105 on the two smoke collecting boxes 102 are arranged opposite to each other, that is, one of the sliding plates 201 can push the smoke collecting box The air in the body 102 is passed to the push tube 105, which can accelerate the gas flow speed of the push tube 105, while the other one that is releasing smoke will absorb the air in the push tube 105, and the air flow speed in the push tube 105 will decrease. After the air flow speed in one push tube 105 increases and the air flow speed in the other push tube 105 decreases, the push tube 105 opposite to the delivery tube 204 that is releasing smoke is allowed to absorb more air in the Venturi channel 106, so that the released smoke can pass through the air flow sensor 101, thereby ensuring the accuracy of detection.

[0056] As a further solution of the present invention, a frame 300 is connected inside the detection port 104, the airflow sensor 101 is connected to the frame 300, and a sealing plate 301 is connected to one side of the frame 300;

[0057] By providing the frame 300 , the frame 300 can support the position of the airflow sensor 101 , and the provided closing plate 301 can close the detection port 104 to ensure that smoke can only flow through the Venturi channel 106 , thereby avoiding the problem of smoke backflow.

[0058] As a further solution of the present invention, the air blowing unit includes a first shaft 400 connected to the air flow channel 100, and an exhaust fan 401 is provided on the first shaft 400;

[0059] By providing the exhaust fan 401 , when in use, the first shaft 400 can be rotated to allow the exhaust fan 401 to rotate, thereby achieving the purpose of sucking the air in the push tube 105 .

[0060] As a further solution of the present invention, a second shaft 402 is connected to one side of the smoke collecting box 102, a first gear 403 is connected to the second shaft 402, a third shaft 404 is connected to the frame 300, and two ends of the third shaft 404 are respectively connected to a second gear 405 and a third gear 406, the second gear 405 is meshed with the first gear 403, and a fourth gear 407 meshed with the third gear 406 is connected to the first shaft 400, a reciprocating screw rod 408 is rotatably connected to the smoke collecting box 102, a connecting frame 409 connected to the sliding plate 201 is threadedly connected to the reciprocating screw rod 408, and a chain transmission mechanism 410 is connected between the second shaft 402 and the reciprocating screw rod 408;

[0061] By setting the second shaft 402, the second shaft 402 can be rotated when in use. The rotation of the second shaft 402 can rotate the first shaft 400 through the first gear 403, the second gear 405, the third shaft 404, the third gear 406 and the fourth gear 407. At the same time, the reciprocating screw rod 408 can also be rotated through the chain transmission mechanism 410, so that the sliding plates 201 in the two smoke collecting boxes 102 can move synchronously while the exhaust fan 401 rotates, so as to achieve the purpose of absorbing and discharging smoke.

[0062] As a further solution of the present invention, a ratchet mechanism 411 is connected between the first shaft 400 and the fourth gear 407;

[0063] By setting up the ratchet mechanism 411, when the fourth gear 407 rotates along with the second shaft 402, the first shaft 400 and the exhaust fan 401 can be rotated through the ratchet mechanism 411. When the second shaft 402 stops rotating and no longer absorbs and discharges smoke, the first shaft 400 and the exhaust fan 401 will idle on the first shaft 400 due to inertia and the set ratchet mechanism 411, that is, the air in the push tube 105 is still being extracted. By utilizing the final rotational inertia, the detection port 104 can be blown and cleaned to prepare for the next detection in advance.

[0064] As a further solution of the present invention, a motor 412 is connected to the smoke collecting box 102, and a chain transmission mechanism 410 is also provided between the driving shaft of the motor 412 and the second shaft 402;

[0065] By providing the motor 412 , the motor 412 and the chain transmission mechanism 410 can provide driving force for the rotation of the second shaft 402 .

[0066] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An airflow sensor assembly, characterized in that: include: An air flow channel, and an air flow sensor disposed in the air flow channel; A smoke delivery component is provided between the airflow channel and the airflow sensor, and is used to deliver gas to the airflow sensor; wherein the smoke delivery component can prevent the smoke from flowing back after delivering the airflow through the airflow sensor; the smoke delivery component comprises: Two smoke collecting boxes arranged in the air flow channel; A connecting plate arranged in the airflow channel, wherein a detection port is provided on the connecting plate, and an airflow sensor is arranged in the detection port; A push pipe is arranged between the smoke collecting box and the connecting plate, the push pipes on the two smoke collecting boxes are arranged opposite to each other, one end of the push pipe passes through the connecting plate, a Venturi channel is connected between the detection port and the push pipe, a cleaning port is opened on the side of the airflow channel, and a cleaning port connected to the cleaning port is opened on the push pipe; A smoke collecting part disposed in the smoke collecting box body, used for absorbing smoke at the air inlet of the air flow channel; A blasting portion disposed in the air flow channel, used to extract gas in the push tube; Wherein, when the blasting part extracts the gas in the push pipe, it can intermittently extract the smoke at the air inlet of the airflow channel through the smoke collecting parts in the two smoke collecting boxes, and when one of the smoke collecting boxes is absorbing the smoke, the other smoke collecting box can release the smoke into the detection port, and the smoke is released when the pressure in the smoke collecting box increases to a preset value; Wherein, the smoke collecting part can push the gas in the pushing pipe when absorbing smoke; The smoke collecting part includes a fixed plate and a sliding plate arranged in the smoke collecting box body, the fixed plate is fixed in the smoke collecting box body, an air bag is connected between the fixed plate and the sliding plate, a first one-way valve mechanism is provided on one side of the fixed plate, the first one-way valve mechanism is used for air intake, a delivery pipe connected to the smoke collecting box body, the other end of the delivery pipe is connected to the connecting plate and connected to the detection port, one end of the delivery pipe located in the detection port is provided with a second one-way valve mechanism, the second one-way valve mechanism is used for air exhaust.

2. An airflow sensor assembly according to claim 1, characterized in that: The first one-way valve mechanism and the second one-way valve mechanism have the same structure, and the first one-way valve mechanism includes a connecting pipe connected to one side of the fixed plate and connected to the air inlet of the airflow channel, and a first bracket is connected in the connecting pipe; the second one-way valve mechanism includes a second bracket connected to one end of the delivery pipe located in the detection port; wherein, one end of the first bracket and the second bracket are connected with a baffle through a spring telescopic rod, one side of the baffle is connected to a sliding tube, and a plurality of ventilation holes are opened on the outer wall of the sliding tube.

3. An airflow sensor assembly according to claim 2, characterized in that: A frame is connected inside the detection port, an airflow sensor is connected to the frame, and a closing plate is connected to one side of the frame.

4. An airflow sensor assembly according to claim 3, characterized in that: The air blowing part includes a first shaft connected to the air flow channel, and an exhaust fan is arranged on the first shaft.

5. An airflow sensor assembly according to claim 4, characterized in that: A second shaft is connected to one side of the smoke collecting box, a first gear is connected to the second shaft, a third shaft is connected to the frame, two ends of the third shaft are respectively connected to the second gear and the third gear, the second gear is meshed with the first gear, the first shaft is connected to a fourth gear meshed with the third gear, a reciprocating screw rod is rotatably connected to the smoke collecting box, a connecting frame connected to the sliding plate is threadedly connected to the reciprocating screw rod, and a chain transmission mechanism is connected between the second shaft and the reciprocating screw rod.

6. An airflow sensor assembly according to claim 5, characterized in that: A ratchet mechanism is connected between the first shaft and the fourth gear.

7. The airflow sensor assembly according to claim 5, characterized in that: The smoke collecting box is connected with a motor, and a chain transmission mechanism is also arranged between the driving shaft of the motor and the second shaft.

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