Independent photoelectric smoke sensing fire detection alarm with active smoke inlet function

Abstract

The invention relates to an independent photoelectric smoke-sensing fire detection alarm with an active smoke inlet function, and the alarm comprises an alarm body, the top of the alarm body is provided with a maintenance mechanism, and the interior of the alarm body is provided with a multi-stage detection mechanism. According to the invention, through the arrangement of the multi-stage detection mechanism, passive smoke inlet detection and active airflow sampling detection are integrated, multi-stage judgment logic is ingeniously realized, the low power consumption and maintenance-free advantages of a traditional passive smoke alarm are retained, and the accuracy of fire alarm judgment is remarkably improved through an active sampling means; false alarm caused by non-fire alarm factors such as dust and eggs is effectively inhibited, meanwhile, a feedback zero calibration mechanism is introduced, self-learning and self-correction functions are achieved, the detection benchmark can be dynamically adjusted according to long-term drifting of the sensor or the structure pollution state, and the long-term stability and reliability of equipment are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of alarms, and in particular to an independent photoelectric smoke fire detection alarm with an active smoke intake function. Background Art

[0002] With the continuous improvement of people's living standards, the construction of security systems has received more and more attention from all walks of life. Fire prevention and control, as an important part of the security system, has gradually been applied to more places. At present, there are many types of equipment used for smoke identification in the early stage of fire. From the perspective of active and passive methods of smoke detection, they can be roughly divided into two categories: one is a passive smoke detection device represented by an independent photoelectric smoke fire detector; the other is an active smoke detection device represented by an inhalation smoke alarm.

[0003] In practice, there are still some problems: Passive smoke intake devices have the advantages of easy installation, no environmental picks, ultra-low power consumption, long service life, and maintenance-free. They are suitable for wide applications, but they also have disadvantages in actual use. For example, they are easily affected by interference and produce false alarms, there may be a distance delay between the alarm and the fire point, and it is difficult to respond to alarms in time at night. These problems often cause on-duty personnel to be tired of coping and gradually develop a paralysis mentality, thereby reducing the efficiency of fire emergency response and posing a huge safety hazard. Although active smoke intake devices have the advantages of accurate detection, low false alarm rate, and strong reliability, and are more stable than passive devices in long-term operation, their shortcomings cannot be ignored. Due to the need for continuous exhaust detection, the power consumption is high, and low-power operation cannot be achieved. During installation, exhaust pipes and stable power supplies must be arranged, and the overall cost is high. It is usually only suitable for factories or places with fire control rooms. Traditional fire alarms have many problems in actual application. First, the installation generally adopts the screw fixing method, which is not only cumbersome and inefficient, but also difficult to align and prone to offset, affecting the installation stability; secondly, in daily use, the ventilation slots and smoke ducts are easily blocked by the accumulation of dust, fibers or insect eggs, but traditional equipment generally lacks convenient maintenance structures and requires manual disassembly and cleaning, which is not only time-consuming and labor-intensive, but also increases maintenance costs; in addition, traditional alarms usually do not have self-cleaning capabilities, and their sensitivity decreases after long-term use, making them prone to false alarms or missed alarms, seriously affecting their reliability and safety performance. In addition, they are highly dependent on tools during installation and maintenance, which is not conducive to rapid deployment and high-frequency maintenance operations. Summary of the Invention

[0004] (1) Technical issues to be resolved In order to solve the above problems in the prior art, the present invention provides an independent photoelectric smoke fire detection alarm with active smoke intake function, which solves the problems of high false alarm rate of passive smoke intake devices, high power consumption of active ones, and difficult maintenance of traditional alarms.

[0005] (2) Technical solution In order to achieve the above object, the main technical solutions adopted by the present invention are: An independent photoelectric smoke fire detection alarm with an active smoke intake function comprises an alarm body, a maintenance mechanism is provided on the top of the alarm body, and a multi-stage detection mechanism is provided inside the alarm body; A multi-stage detection mechanism includes an active maze inner cavity, a passive maze inner cavity, a photoelectric emitting tube 1, a photoelectric emitting tube 2, a connector and an operational amplifier. The active maze inner cavity is opened on one side of the alarm body, and the passive maze inner cavity is opened in the middle of the alarm body. The two connectors are respectively fixedly connected to the two side walls of the passive maze inner cavity, and the bottom ends of the two connectors are respectively fixedly connected to the photoelectric emitting tube 1 and the photoelectric emitting tube 2. The operational amplifier is connected to the inner wall of the active maze inner cavity.

[0006] The bottom end of the alarm body is fixedly connected with a buzzer, the outer wall of the alarm body is fixedly connected with an exhaust pipe, and the inner wall of the exhaust pipe is hinged with a protective diaphragm.

[0007] A protective plate is fixedly connected to the inner wall of the passive labyrinth inner cavity, the active labyrinth inner cavity is communicated with the passive labyrinth inner cavity, and a ventilation slot is provided on the outer wall of the alarm body.

[0008] A fan is connected to the inner wall of the active maze cavity, and a photoelectric receiving tube 2 and a photoelectric transmitting tube 2 are respectively connected to both sides of the inner wall of the active maze cavity. A single-chip microcomputer control unit is fixedly connected to one side wall of the active maze cavity, and the single-chip microcomputer control unit is electrically connected to the buzzer.

[0009] An operational amplifier is fixedly connected to the inner wall of the active labyrinth cavity, the second photoelectric receiving tube is electrically connected to the operational amplifier, and the operational amplifier is electrically connected to the single-chip microcomputer control unit.

[0010] The maintenance mechanism includes a guide rail, a slider, a transmission plate and a limiting groove. The limiting groove is opened on the inner side of the transmission plate. The inner wall of the guide rail is slidably connected to the slider.

[0011] The top of the alarm body is connected to a mounting plate, the outer wall of the mounting plate is rotatably connected to a gear ring, one side of the gear ring is meshed with a gear, and the outer wall of the mounting plate is fixedly connected to a support plate.

[0012] One end of the support plate is fixedly connected to a motor, the output end of the motor is fixedly connected to the bottom end of the gear, the bottom end of the gear ring is fixedly connected to an L-shaped fixing plate, the inner side of the L-shaped fixing plate is fixedly connected to a return spring rod, and the inner side of the return spring rod is fixedly connected to an anti-blocking brush.

[0013] The inner side of the anti-blocking brush is attached to the outer wall of the ventilation slot, the bottom end of the transmission plate is rotatably connected to the top end of the mounting plate, the top end of the slider is fixedly connected to a locking spring rod, the top end of the mounting plate is fixedly connected to a connecting plate, and one side of the slider passes through the connecting plate.

[0014] The inner wall of the connecting plate is vertically slidably connected to an unlocking plate, the inner wall of the limiting groove is slidably connected to a limiting column, and one end of the limiting column is rotatably connected to the inner side of the slider.

[0015] (3) Beneficial effects The beneficial effects of the present invention are: 1. In the present invention, a multi-stage detection mechanism is set up to integrate passive smoke inlet detection and active airflow sampling detection, and the multi-stage judgment logic is cleverly realized. It not only retains the low power consumption and maintenance-free advantages of traditional passive smoke alarms, but also significantly improves the accuracy of fire alarm judgment through active sampling means, effectively suppressing false alarms caused by non-fire alarm factors such as dust and insect eggs. At the same time, a feedback zero-point calibration mechanism is introduced, which has self-learning and self-correction functions, and can dynamically adjust the detection benchmark according to the long-term drift of the sensor or the structural pollution status, thereby improving the long-term stability and reliability of the equipment. The overall structure does not require wiring and is easy to install. It is particularly suitable for widespread promotion and application in scenarios such as residential buildings, schools, and shops with low tolerance for false alarms and limited maintenance conditions.

[0016] 2. In the present invention, through the maintenance mechanism provided, when the user needs to install the alarm body, the guide rail can be fixedly installed at the target installation position first. Then, the user aligns the top end of the mounting plate with the bottom end of the guide rail, and aligns the limiting groove provided on the inner side of the transmission plate with the limiting column. By rotating the alarm body, the limiting column slides under the guidance of the limiting groove, thereby driving the slider to slide along the guide rail. The front end of the slider can pass through the connecting plate, and after sliding to the preset position, the locking spring rod provided on its inner side will automatically insert into the limiting hole on the inner side of the connecting plate, thereby realizing automatic locking and completing the fixed installation of the alarm body. , eliminating the tedious screw fixing or manual alignment steps, significantly simplifying the installation process. When the user needs to clean and maintain the ventilation slot, the motor of the maintenance mechanism can be started, and the driving gear connected to the output end of the motor starts to rotate, driving the gear ring engaged with it to rotate synchronously. The rotation of the gear ring will further drive the L-shaped fixing plate connected to it to rotate. A reset spring rod is provided on the inner side of the L-shaped fixing plate, and the spring rod is connected to the anti-blocking brush. During the rotation process, the anti-blocking brush will produce a brushing action on the inner wall of the ventilation slot, thereby effectively removing blockages such as dust and fiber, keeping the ventilation slot unobstructed and improving the detection sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural schematic diagram of the bottom of the alarm body of the present invention; Figure 3 This is a schematic diagram of the structure of the alarm body of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 For the present invention Figure 3 Enlarged view of point B in the middle; Figure 6 It is a structural schematic diagram of the bottom of the transmission plate of the present invention; Figure 7 It is a schematic structural diagram of the inner cavity portion of the active maze of the present invention.

[0018] [Description of Reference Numerals] 1. Alarm body; 2. Maintenance mechanism; 201. Connecting plate; 202. Support plate; 203. Motor; 204. Gear; 205. Gear ring; 206. L-shaped fixing plate; 207. Return spring rod; 208. Limiting column; 209. Mounting plate; 210. Guide rail; 211. Slider; 212. Anti-blocking brush; 213. Locking spring rod; 214. Unlocking plate; 215. Transmission plate; 216. Limiting slot; 3. Multi-stage Detection mechanism; 301, exhaust pipe; 302, buzzer; 303, ventilation slot; 304, passive labyrinth cavity; 305, protective diaphragm; 306, connector; 307, photoelectric transmitting tube 1; 308, photoelectric receiving tube 1; 309, fan; 310, active labyrinth cavity; 311, single-chip microcomputer control unit; 312, photoelectric transmitting tube 2; 313, operational amplifier; 314, photoelectric receiving tube 2; 315, protective plate. DETAILED DESCRIPTION

[0019] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0020] Please refer to Figures 1 to 7 As shown, the present invention is an independent photoelectric smoke fire detection alarm with an active smoke intake function, comprising an alarm body 1, a maintenance mechanism 2 is provided on the top of the alarm body 1, and a multi-stage detection mechanism 3 is provided inside the alarm body 1; The multi-stage detection mechanism 3 includes an active maze inner cavity 310, a passive maze inner cavity 304, a photoelectric emitting tube 1 307, a photoelectric emitting tube 2 312, a connector 306 and an operational amplifier 313. The active maze inner cavity 310 is opened on one side of the alarm body 1, and the passive maze inner cavity 304 is opened in the middle of the alarm body 1. The two connectors 306 are respectively fixedly connected to the two side walls of the passive maze inner cavity 304. The bottom ends of the two connectors 306 are respectively fixedly connected to the photoelectric emitting tube 1 307 and the photoelectric emitting tube 2 312. The operational amplifier 313 is connected to the inner wall of the active maze inner cavity 310.

[0021] Optionally, a buzzer 302 is fixedly connected to the bottom end of the alarm body 1, an exhaust pipe 301 is fixedly connected to the outer wall of the alarm body 1, and a protective diaphragm 305 is hingedly connected to the inner wall of the exhaust pipe 301. In actual implementation, when the single-chip control unit 311 detects that the smoke concentration exceeds the alarm threshold, it drives the buzzer 302 to sound the alarm. The exhaust pipe 301 with the protective diaphragm 305 can seal the channel when not in operation, effectively preventing dust and insects from entering the interior of the alarm body 1, thereby improving the stability and service life of the device.

[0022] Optionally, a protective plate 315 is fixedly attached to the inner wall of the passive labyrinth cavity 304, and the active labyrinth cavity 310 is connected to the passive labyrinth cavity 304. Ventilation slots 303 are provided on the outer wall of the alarm body 1. In actual implementation, the protective plate 315 effectively blocks large dust particles and insect eggs, reducing the chance of false alarms. The labyrinth interconnectedness and ventilation slots 303 improve air flow efficiency, ensuring that smoke can smoothly enter the active detection area.

[0023] Optionally, a fan 309 is connected to the inner wall of the active maze cavity 310. A second photoelectric receiving tube 314 and a second photoelectric transmitting tube 312 are connected to the inner walls of the active maze cavity 310, respectively. A single-chip microcomputer control unit 311 is fixedly connected to one side wall of the active maze cavity 310. The single-chip microcomputer control unit 311 is electrically connected to the buzzer 302. In actual implementation, when the detection enters the secondary judgment process, the single-chip microcomputer control unit 311 controls the fan 309 to turn on, actively drawing ambient air into the active maze for optical sampling. If a smoke signal is detected, the buzzer 302 is triggered to sound an alarm. Active air sampling is achieved through the fan 309, thereby improving detection sensitivity.

[0024] Optionally, an operational amplifier 313 is fixedly connected to the inner wall of the active labyrinth cavity 310 , the second photoelectric receiving tube 314 is electrically connected to the operational amplifier 313 , and the operational amplifier 313 is electrically connected to the single-chip microcomputer control unit 311 .

[0025] Optionally, the maintenance mechanism 2 includes a guide rail 210 , a slider 211 , a transmission plate 215 and a limiting groove 216 . The limiting groove 216 is provided on the inner side of the transmission plate 215 , and the inner wall of the guide rail 210 is slidably connected to the slider 211 .

[0026] Optionally, the top of the alarm body 1 is connected to a mounting plate 209 , the outer wall of the mounting plate 209 is rotatably connected to a gear ring 205 , one side of the gear ring 205 is meshed with a gear 204 , and the outer wall of the mounting plate 209 is fixedly connected to a support plate 202 .

[0027] Optionally, one end of the support plate 202 is fixedly connected to the motor 203, the output end of the motor 203 is fixedly connected to the bottom end of the gear 204, the bottom end of the gear ring 205 is fixedly connected to the L-shaped fixing plate 206, the inner side of the L-shaped fixing plate 206 is fixedly connected to the return spring rod 207, and the inner side of the return spring rod 207 is fixedly connected to the anti-blocking brush 212.

[0028] Optionally, the inner side of the anti-blocking brush 212 is attached to the outer wall of the ventilation slot 303, the bottom end of the transmission plate 215 is rotatably connected to the top end of the mounting plate 209, the top end of the slider 211 is fixedly connected to the locking spring rod 213, the top end of the mounting plate 209 is fixedly connected to the connecting plate 201, and one side of the slider 211 passes through the connecting plate 201. In actual implementation, when the alarm body 1 is rotated, the limiting structure and the locking spring rod 213 are automatically positioned and engaged, achieving a stable installation.

[0029] Optionally, the inner wall of the connecting plate 201 is vertically slidably connected to an unlocking plate 214, the inner wall of the limiting groove 216 is slidably connected to a limiting column 208, and one end of the limiting column 208 is rotatably connected to the inner side of the slider 211. During actual implementation, when disassembly is required, the user can push the unlocking plate 214 to disengage the limiting column 208 from the limiting groove 216, and the slider 211 withdraws from the guide rail 210, completing quick disassembly.

[0030] Working principle: It mainly consists of the alarm body 1, multi-level detection mechanism 3, buzzer 302, ventilation slot 303, passive maze cavity 304, active maze cavity 310, fan 309, photoelectric transmitting tube, photoelectric receiving tube, operational amplifier 313 and single-chip control unit 311. The whole device is powered by battery, and the single-chip control unit 311 uniformly controls the power on and off and working logic of each component to achieve low-power operation and intelligent judgment alarm. In the standby monitoring state, the device defaults to the passive smoke detection mode. This mode uses the open design of the passive maze cavity 304 to naturally guide the outside air into the maze cavity through the four sides of the ventilation slot 303. The maze is equipped with a photoelectric transmitting tube 307 and a photoelectric receiving tube 307. 8. The two are staggered to avoid direct radiation, and the signal is formed only by the scattering and reflection of infrared light by particles in the smoke. When smoke particles in the air enter the maze cavity, they will scatter the light signal emitted by the photoelectric transmitting tube 307. Part of the scattered light is received by the receiving tube and converted into a micro-electric signal. The electric signal is amplified by the operational amplifier 313 and transmitted to the single-chip control unit 311 for processing. After the sampling signal reaches the set threshold, it enters the secondary detection process. In order to distinguish between real fire alarms and interference factors such as dust and insect eggs, the active maze detection module is controlled by the single-chip control unit 311 to start. First, the fan 309 is controlled to run. The fan 309 discharges the air in the active maze through the exhaust pipe 301 to form an internal negative pressure environment. Then, the external air sample is sucked in through the narrow and curved active maze air intake channel. This process simulates the path of smoke in the air at the fire scene being sucked into the maze, and has stronger anti-interference ability. Subsequently, the photoelectric transmitting tube 2 312 is turned on and emits infrared light at a high frequency. The light is reflected after encountering smoke particles and is received by the photoelectric receiving tube 2 314, generating a reflected signal and amplified by the amplifier for collection by the single-chip control unit 311. The single-chip control unit 311 compares the active detection data with the passive detection data. If the active maze also detects the presence of smoke, it is determined to be a real fire and the alarm action process is triggered: the buzzer 302 is activated to sound, the current alarm level is displayed through the LED light, and the communication module is started to report the alarm to the remote platform or user terminal. If Active detection does not detect smoke, and the single-chip microcomputer control unit 311 determines that this detection is a false alarm. In order to prevent the false alarm from affecting subsequent monitoring, the system starts the "feedback zero point calibration" mechanism. When active detection confirms that there is no smoke, if the passive maze detection value continues to be higher than the set baseline for a period of time and the fluctuation range is small, the single-chip microcomputer control unit 311 will store the current detection value as the new zero point to correct the baseline offset caused by dust accumulation or pollution, thereby effectively avoiding subsequent false alarms. During the overall working process, each detection module, power management circuit, LED indicator, buzzer 302 and communication module are all time-sharing controlled by the single-chip microcomputer control unit 311 to realize on-demand power supply, delay judgment, status display and remote data upload functions.The system significantly improves the reliability and accuracy of fire alarms through passive and active dual-channel collaborative judgment, combined with zero-point self-calibration technology. When the user needs to install the alarm body 1, the guide rail 210 can be fixedly installed in the target installation position first. Then, the user aligns the top of the mounting plate 209 with the bottom of the guide rail 210, and aligns the limiting groove 216 on the inner side of the transmission plate 215 with the limiting column 208. By rotating the alarm body 1, the limiting column 208 slides under the guidance of the limiting groove 216, thereby driving the slider 211 to slide along the guide rail 210. The front end of the slider 211 can pass through the connecting plate 201, and after sliding to the preset position, the locking spring rod 213 on its inner side will automatically insert into the limiting hole on the inner side of the connecting plate 201, thereby realizing self-calibration. The automatic locking and completion of the fixed installation of the alarm body 1 eliminates the tedious screw fixing or manual alignment steps, and significantly simplifies the installation process. When the user needs to clean and maintain the ventilation slot 303, the motor 203 of the maintenance mechanism 2 can be started, and the driving gear 204 connected to the output end of the motor 203 starts to rotate, driving the gear ring 205 engaged with it to rotate synchronously. The rotation of the gear ring 205 will further drive the L-shaped fixed plate 206 connected thereto to rotate. A reset spring rod 207 is provided on the inner side of the L-shaped fixed plate 206, and the spring rod is connected to the anti-blocking brush 212. During the rotation process, the anti-blocking brush 212 will produce a brushing action on the inner wall of the ventilation slot 303, thereby effectively removing blockages such as dust and fiber, keeping the ventilation slot 303 unobstructed and improving the detection sensitivity.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention, and the standard parts used in the present invention can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0032] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An independent photoelectric smoke fire detection alarm with an active smoke intake function, comprising an alarm body (1), characterized in that: A maintenance mechanism (2) is provided on the top of the alarm body (1), and a multi-stage detection mechanism (3) is provided inside the alarm body (1); A multi-stage detection mechanism (3), the multi-stage detection mechanism (3) includes an active maze inner cavity (310), a passive maze inner cavity (304), a photoelectric emitting tube 1 (307), a photoelectric emitting tube 2 (312), a connector (306) and an operational amplifier (313), wherein the active maze inner cavity (310) is opened on one side of the alarm body (1), the passive maze inner cavity (304) is opened in the middle of the alarm body (1), the two connectors (306) are respectively fixedly connected to the two side walls of the passive maze inner cavity (304), the bottom ends of the two connectors (306) are respectively fixedly connected to the photoelectric emitting tube 1 (307) and the photoelectric emitting tube 2 (312), and the operational amplifier (313) is connected to the inner wall of the active maze inner cavity (310).

2. The independent photoelectric smoke fire detection alarm with active smoke intake function according to claim 1, characterized in that: The bottom end of the alarm body (1) is fixedly connected to a buzzer (302), the outer wall of the alarm body (1) is fixedly connected to an exhaust pipe (301), and the inner wall of the exhaust pipe (301) is hinged with a protective diaphragm (305).

3. The independent photoelectric smoke fire detection alarm with active smoke intake function according to claim 2, characterized in that: A protective plate (315) is fixedly connected to the inner wall of the passive labyrinth inner cavity (304), the active labyrinth inner cavity (310) is connected to the passive labyrinth inner cavity (304), and a ventilation slot (303) is provided on the outer wall of the alarm body (1).

4. The independent photoelectric smoke fire detection alarm with active smoke intake function according to claim 3, characterized in that: The inner wall of the active labyrinth inner cavity (310) is connected to a fan (309), and two sides of the inner wall of the active labyrinth inner cavity (310) are respectively connected to a second photoelectric receiving tube (314) and a second photoelectric transmitting tube (312), and a single-chip microcomputer control unit (311) is fixedly connected to one side wall of the active labyrinth inner cavity (310), and the single-chip microcomputer control unit (311) is electrically connected to a buzzer (302).

5. The independent photoelectric smoke fire detection alarm with active smoke intake function according to claim 4, characterized in that: An operational amplifier (313) is fixedly connected to the inner wall of the active labyrinth inner cavity (310), the second photoelectric receiving tube (314) is electrically connected to the operational amplifier (313), and the operational amplifier (313) is electrically connected to the single-chip microcomputer control unit (311).

6. The independent photoelectric smoke fire detection alarm with active smoke intake function according to claim 5, characterized in that: The maintenance mechanism (2) comprises a guide rail (210), a slider (211), a transmission plate (215) and a limiting groove (216), wherein the limiting groove (216) is provided on the inner side of the transmission plate (215), and the inner wall of the guide rail (210) is slidably connected to the slider (211).

7. The independent photoelectric smoke fire detection alarm with active smoke intake function according to claim 6, characterized in that: The top end of the alarm body (1) is connected to a mounting plate (209), the outer wall of the mounting plate (209) is rotatably connected to a gear ring (205), one side of the gear ring (205) is meshed with a gear (204), and the outer wall of the mounting plate (209) is fixedly connected to a support plate (202).

8. The independent photoelectric smoke fire detection alarm with active smoke intake function according to claim 7, characterized in that: One end of the support plate (202) is fixedly connected to a motor (203), the output end of the motor (203) is fixedly connected to the bottom end of the gear (204), the bottom end of the gear ring (205) is fixedly connected to an L-shaped fixing plate (206), the inner side of the L-shaped fixing plate (206) is fixedly connected to a return spring rod (207), and the inner side of the return spring rod (207) is fixedly connected to an anti-blocking brush (212).

9. The independent photoelectric smoke fire detection alarm with active smoke intake function according to claim 8, characterized in that: The inner side of the anti-blocking brush (212) is attached to the outer wall of the ventilation slot (303); the bottom end of the transmission plate (215) is rotatably connected to the top end of the mounting plate (209); the top end of the slider (211) is fixedly connected to a locking spring rod (213); the top end of the mounting plate (209) is fixedly connected to a connecting plate (201); and one side of the slider (211) passes through the connecting plate (201).

10. The independent photoelectric smoke fire detection alarm with active smoke intake function according to claim 9, characterized in that: The inner wall of the connecting plate (201) is vertically slidably connected to an unlocking plate (214), the inner wall of the limiting groove (216) is slidably connected to a limiting column (208), and one end of the limiting column (208) is rotatably connected to the inner side of the slider (211).

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