Fire and gas detection alarm device and detection method

Abstract

The invention discloses a fire and gas detection alarm device which comprises a first shell, a controller and a first power module are arranged in the first shell, the first power module is mechanically connected with one end of a movable seat, the other end of the movable seat penetrates through the first shell and then is fixedly connected with a first gas detection device, and one side of the first shell is hinged to one end of a movable connecting shaft. The other end of the movable connecting shaft is mechanically connected with a fire and gas detection device, the first shell is further provided with an electrical interface and a first audible and visual alarm, and the controller is electrically connected with the first power module, the first gas detection device, the fire and gas detection device and the first audible and visual alarm. Combustible gas, toxic gas and fire can be detected at the same time, the arrangement number of detectors is reduced, multidirectional inspection is achieved, the gas detection device achieves detection of different component gases by emitting lasers with different wavelengths, high sensitivity and long-distance measurement are achieved, and the gas detection device is not affected by environment humidity.

Description

Fire detection alarm device and detection method Technical Field

[0001] This invention belongs to the technical field of oil and gas field construction equipment, and relates to a fire and gas detection alarm device. This invention also relates to a fire and gas detection method. Background Technology

[0002] As sites for the production, processing, storage and transportation of oil and gas resources, oil and gas field plants and stations have numerous process equipment and complex processes. In order to ensure the safe and stable operation of oil and gas field plants and stations, it is necessary to install combustible gas detectors and toxic gas detectors in the equipment and device areas of the station, and flame detectors in important device areas, to detect combustible gas and toxic gas leaks and fires, respectively.

[0003] Currently, flame detectors, combustible gas detectors, and toxic gas detectors are all installed using column or wall-mounted methods. During on-site installation, their detection positions need to be manually adjusted. During production and operation, the detection positions of combustible gas detectors, toxic gas detectors, and flame detectors remain unchanged. Combustible gas detectors use catalytic combustion or infrared detection principles, while toxic gas detectors use electrochemical detection principles. The detection signals are transmitted to the gas alarm controller. Flame detectors use infrared composite detection principles, ultraviolet composite detection principles, or infrared multi-frequency composite detection principles. The detector's horizontal detection angle is 120°, and its vertical viewing angle is 90°. The detection signals are uploaded to the automatic fire alarm device.

[0004] Although the detection orientation of the detectors can be adjusted on-site, it cannot be automatically adjusted during later operation, resulting in a fixed detection orientation. Furthermore, catalytic combustion combustible gas detectors detect gases by generating heat or electricity through chemical reactions, leading to short sensor lifespans, sensitivity to environmental conditions, and susceptibility to zero-point drift, resulting in short calibration cycles. Infrared combustible gas detectors use mid-infrared light sources and filter technology, making them susceptible to interference from water molecules, and the infrared light signal is relatively weak. Toxic gas detectors also have limited detection ranges. Flame detectors only issue alarms when a fire occurs, failing to provide early fire warnings. In large stations, numerous flame detectors, combustible gas detectors, and toxic gas detectors are deployed, with limited protection ranges, high construction costs, long construction periods, and significant maintenance and calibration workloads. Therefore, composite multi-directional fire and gas detection and alarm devices have excellent application prospects in oil and gas field stations. Summary of the Invention

[0005] The purpose of this invention is to provide a fire detection and alarm device, which solves the problem that existing detectors cannot simultaneously detect and alarm for toxic gases, combustible gases, and fires.

[0006] The second objective of this invention is to provide a method for detecting flames.

[0007] The first technical solution adopted in this invention is a gas detection and alarm device, comprising a first housing, a controller and a first power module disposed inside the first housing, one end of the first power module being mechanically connected to a movable seat, the other end of the movable seat passing through the first housing and fixedly connected to a first gas detection device, one end of the first housing being mechanically connected to a movable shaft, the other end of the movable shaft being hinged to a gas detection device, an electrical interface and a first audible and visual alarm disposed on the first housing, and the controller being electrically connected to the first power module, the first gas detection device, the gas detection device and the first audible and visual alarm respectively.

[0008] The first technical solution of the present invention is further characterized in that: the first gas detection device includes a second housing, inside which a sample gas collection chamber and a gas detection chamber are arranged; each side of the sample gas collection chamber is provided with an air inlet, and a sample gas pipeline is arranged through the two air inlets; a gas collection module is arranged inside the sample gas collection chamber; two first lenses are arranged inside the sample gas collection chamber, and the two first lenses sequentially divide the sample gas collection chamber into a first chamber, a detection chamber, and a second chamber; a first signal detection element is arranged inside the first chamber, and a first laser emitter is arranged inside the second chamber; the detection chamber is connected to the gas collection module through a connecting pipe, and an exhaust port is opened on one side of the detection chamber; the gas collection module, the first signal detection element, and the first laser emitter are electrically connected to the controller, and the gas collection module is mechanically connected to the sample gas pipeline.

[0009] The fire and gas detection device includes a third housing, on which a second audible and visual alarm is installed. Inside the third housing are a second power module, a flame detection device, and a second gas detection device. A movable coupling passes through the third housing and is mechanically connected to the second power module. The second power module, the second audible and visual alarm, the flame detection device, and the second gas detection device are all electrically connected to the controller.

[0010] The second gas detection device includes a fourth housing, inside which a second laser emitter and a second signal detection element are disposed. A second lens is fixed on the inner wall of the fourth housing. The second laser emitter and the second signal detection element are electrically connected to the controller.

[0011] The second technical solution adopted in this invention is a fire detection method, specifically including the following steps: Step 1, connecting the controller to power through an electrical interface, setting two levels of gas alarm limits and multiple detection points in the controller; Step 2, rotating the fire detection device through the first power module and the second power module, stopping the rotation after the fire detection device reaches the first detection point, detecting the surrounding gas concentration through the first gas detection device and the second gas detection device, triggering a first-level alarm when the gas concentration exceeds the first-level gas alarm limit, and triggering a second-level alarm when it exceeds the second-level gas alarm limit; detecting fire through the flame detection device, triggering a fire alarm if a fire occurs; Step 3, after completing the detection of the first detection point, repeating step 2, and after all detection points have been detected, starting the detection again from the first detection point.

[0012] The second technical solution of the present invention is further characterized in that: the steps of the first gas detection device in detecting the surrounding gas concentration are as follows: Step a, the controller starts the gas acquisition module, and the gas acquisition module draws the surrounding gas into the detection chamber through the sample gas pipeline; Step b, the controller outputs a periodic current to the first laser emitter at intervals of ΔT1, and the first laser emitter emits a laser of a wavelength selectively absorbed by the corresponding combustible gas or toxic gas to the first signal detection element at intervals of ΔT1. The first signal detection element calculates the gas type and gas concentration by measuring the laser spectral intensity and feeds it back to the controller. The controller controls the first audible and visual alarm to issue a corresponding alarm according to the gas type and gas concentration. After the first laser emitter has emitted all the laser wavelengths that can be absorbed by combustible gases or toxic gases, the controller continues to output current in a cycle; if the gas being measured is combustible, the secondary alarm is a fire pre-alarm.

[0013] The steps for the second gas detection device to detect the surrounding gas concentration in step 2 are as follows: Step c, a laser reflector is placed at each detection point; Step d, the controller outputs a periodic current to the second laser emitter at intervals of ΔT2. The second laser emitter emits a laser of a wavelength selectively absorbed by the corresponding combustible or toxic gas to the laser reflector at intervals of ΔT2. The laser reflector reflects the laser to the second signal detection element. The second signal detection element calculates the gas type and gas concentration by measuring the laser spectral intensity and feeds it back to the controller. The controller controls the second audible and visual alarm to issue the corresponding alarm according to the gas type and gas concentration. After the second laser emitter has emitted all the laser wavelengths that can be absorbed by combustible or toxic gases, the controller stops outputting current. If the gas being measured is combustible, the secondary alarm is a fire pre-alarm.

[0014] In step 2, the flame detection device detects fires by detecting the ultraviolet rays produced by the combustion of materials. If a fire occurs within the detection range, the flame detection device sends the detected data to the controller, which then controls the second audible and visual alarm to issue a fire alarm.

[0015] In step 3, as the fire detection device rotates to the next detection point, the controller restarts and outputs current to the second laser emitter.

[0016] The beneficial effects of this invention are as follows: Applied to oil and gas field stations, this invention integrates multiple functions, effectively increasing the stability and coverage of fire and gas detection. The first power module enables 360° horizontal rotation of the movable seat, and the second power module enables 360° vertical rotation of the fire and gas detection device, thus achieving omnidirectional automatic detection. This increases the range of gas and flame detection while reducing the number of detectors required. The controller can automatically calculate the fire location and gas leak location based on the station equipment area, the rotational angular displacement parameters of the first and second power modules, achieving intelligent positioning. It eliminates the need for two separate detectors for fire and gas detection, reducing the number of detectors required. Setting the secondary alarm for combustible gas leak concentration as a fire early warning alarm enhances fire monitoring. The safety and reliability of the gas detection device are ensured. Utilizing laser principles, it offers high sensitivity, long-distance measurement, and is unaffected by ambient humidity. The same device can detect both combustible and toxic gases, reducing the number of gas detectors required, saving construction time and costs, and minimizing calibration and maintenance workload. A gas acquisition module delivers gas to the detection chamber, reducing gas detection response time. The laser emitter emits a specific wavelength of laser light under the modulation of the driving current. After passing through the gas, the laser light is partially absorbed, weakening the spectral intensity. The absorption intensity is proportional to the gas concentration. The signal detection element measures the gas concentration by measuring the spectral intensity after absorption. The controller modulates the driving current of the laser emitter, causing it to emit laser light of different wavelengths, thus enabling the detection of gases with different components. Attached Figure Description

[0017] Figure 1 is a front sectional view of the present invention; Figure 2 is a side sectional view of the present invention.

[0018] In the diagram, 1. First audible and visual alarm, 2. Controller, 3. First housing, 4. Electrical interface, 5. Movable seat, 6. Sample gas pipeline, 7. First signal detection element, 8. First chamber, 9. First lens, 10. Detection chamber, 11. Exhaust port, 12. Second housing, 13. Connecting pipe, 14. Second chamber, 15. First laser emitter, 16. Gas collection module, 17. Sample gas collection chamber, 18. First gas detection device, 19. Movable coupling, 20. First power module, 21. Flame detection device, 22. Second power module, 23. Second laser emitter, 24. Second lens, 25. Laser reflector, 26. Second signal detection element, 27. Flame detection device, 28. Third housing, 29. Air inlet, 30. Second audible and visual alarm, 31. Fourth housing, 32. Second gas detection device, 33. Gas detection chamber. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] The fire detection alarm device, as shown in Figure 1, includes a first housing 3. Inside the first housing 3, a controller 2 and a first power module 20 are installed. The first power module 20 is mechanically connected to one end of a movable seat 5. The other end of the movable seat 5 passes through the first housing 3 and is fixedly connected to a first gas detection device 18. The first gas detection device 18 is used to detect the gas concentration around it. One side of the first housing 3 is mechanically connected to one end of a movable shaft 19. The other end of the movable shaft 19 is hinged to a fire detection device 21. The first housing 3 is also provided with an electrical interface 4 and a first audible and visual alarm 1. The controller 2 is electrically connected to the first power module 20, the first gas detection device 18, the fire detection device 21, and the first audible and visual alarm 1. The controller 2 controls the rotation of the first power module 20, which in turn causes the movable seat 5 to rotate, and drives the first gas detection device 18 and the fire detection device 21 to rotate within a 360° range in the horizontal direction.

[0021] The first gas detection device 18 includes a second housing 12, inside which are a sample gas collection chamber 17 and a gas detection chamber 33. Each side of the sample gas collection chamber 17 has an air inlet 29, through which a sample gas pipeline 6 is installed. A gas collection module 16 is installed inside the sample gas collection chamber 17. The sample gas collection chamber 17 has two first lenses 9, which sequentially divide the interior of the sample gas collection chamber 17 into a first chamber 8, a detection chamber 10, and a second chamber 14. The first chamber 8 contains a first signal detection element 7, and the second chamber 14 contains a first laser emitter 15. The detection chamber 10 is connected to the gas collection module 16 via a connecting pipe 13, and an exhaust port 11 is opened on one side of the detection chamber 10. The gas collection module 16, the first signal detection element 7, and the first laser emitter 15 are electrically connected to the controller 2, and the gas collection module 16 is mechanically connected to the sample gas pipeline 6.

[0022] Referring to Figure 2, the fire and gas detection device 21 includes a third housing 28, on which a second audible and visual alarm 30 is installed. Inside the third housing 28 are a second power module 22, a flame detection device 27, and a second gas detection device 32. The second gas detection device 32 is used to detect the gas concentration at each detection point. A movable coupling 19 passes through the third housing 28 and is mechanically connected to the second power module 22. The second power module 22, the second audible and visual alarm 30, the flame detection device 27, and the second gas detection device 32 are electrically connected to the controller 2. The controller 2 controls the second power module 22 to rotate, which in turn causes the movable coupling 19 to rotate, and drives the fire and gas detection device 21 to rotate within a 360° range in the vertical direction.

[0023] The second gas detection device 32 includes a fourth housing 31, inside which a second laser emitter 23 and a second signal detection element 26 are installed. A second lens 24 is fixed on the inner wall of the fourth housing 31. The second laser emitter 23 and the second signal detection element 26 are electrically connected to the controller 2. The controller 2 can automatically calculate the fire location and gas leak location based on the rotational angular displacement parameters of the station equipment area, the first power module 20, and the second power module 22, achieving intelligent positioning. The controller 2 can also be connected to the upper-level management system via a cable and transmit alarm signals and alarm area signals to the upper-level management system. The second gas detection device 32 is an active detection device, detecting leaked gas within a fixed straight-line range at a distance. The first gas detection device 18 is a passive detection device, detecting gas that has diffused to the vicinity of the fire and gas detection alarm device, which is used to prevent gas leaks from other areas from spreading to the fire and gas detection alarm device when the second gas detection device 32 is detecting gas.

[0024] The gas detection method specifically includes the following steps: Step 1, connect the controller 2 to the power supply through the electrical interface 4, and set two levels of gas alarm limits and multiple detection points in the controller 2; Step 2, rotate the gas detection device 21 through the first power module 20 and the second power module 22, and stop rotating after the gas detection device 21 rotates to the first detection point. The ambient gas concentration is detected by the first gas detection device 18 and the second gas detection device 32. The process of the first gas detection device 18 detecting the ambient gas concentration is as follows: the controller 2 starts the gas acquisition module 16, and the gas acquisition module 16 draws the ambient gas into the detection chamber 10 through the sample gas pipeline 6. The controller 2 outputs a periodic signal every ΔT1 time interval. A current is supplied to the first laser emitter 15. The first laser emitter 15 emits a laser beam of a wavelength selectively absorbed by a flammable or toxic gas at intervals ΔT1, which is then sent to the first signal detection element 7. After passing through the gas, the laser beam is partially absorbed, reducing its spectral intensity. The absorption intensity is proportional to the gas concentration. The first signal detection element 7 calculates the gas type and concentration by measuring the laser spectral intensity and feeds this information back to the controller 2. The controller 2 controls the first audible and visual alarm 1 to issue a corresponding alarm based on the gas type and concentration. After the first laser emitter 15 has emitted all the laser beams of wavelengths absorbable by flammable or toxic gases, the controller 2 continues to cycle the current output. If the gas being tested is flammable, a secondary alarm is triggered. The alarm is a fire warning; the process of the second gas detection device 32 detecting the surrounding gas concentration is as follows: a laser reflector 25 is arranged at each detection point. The controller 2 outputs a periodic current to the second laser emitter 23 every ΔT2 time interval. The second laser emitter 23 emits a laser of a wavelength selectively absorbed by the corresponding combustible or toxic gas to the laser reflector 25 every ΔT2 time interval. The laser reflector 25 reflects the laser to the second signal detection element 26. The second signal detection element 26 calculates the gas type and gas concentration by measuring the laser spectral intensity and feeds it back to the controller 2. The controller 2 controls the second audible and visual alarm 30 to issue the corresponding alarm based on the gas type and gas concentration. The second laser emitter... After emitting all laser wavelengths that can be absorbed by combustible or toxic gases, controller 2 stops outputting current. If the gas being tested is combustible, the secondary alarm is a fire pre-alarm. Fire is detected by detecting ultraviolet light produced by the combustion of materials through flame detection device 27. If a fire occurs within the detection range, flame detection device 27 sends the detected data to controller 2, and controller 2 controls the second audible and visual alarm 30 to issue a fire alarm. Step 3: After completing the detection at the first detection point, step 2 is repeated. During the process of the fire detection device 21 rotating to the next detection point, controller 2 restarts the output of current to the second laser emitter 23. After all detection points are detected, the detection starts again from the first detection point.

[0025] Example 1: A gas detection alarm device includes a first housing 3. Inside the first housing 3 are a controller 2 and a first power module 20. The first power module 20 is mechanically connected to one end of a movable seat 5. The other end of the movable seat 5 passes through the first housing 3 and is fixedly connected to a first gas detection device 18. One side of the first housing 3 is mechanically connected to one end of a movable shaft 19. The other end of the movable shaft 19 is hinged to a gas detection device 21. The first housing 3 also has an electrical interface 4 and a first audible and visual alarm 1. The controller 2 is electrically connected to the first power module 20, the first gas detection device 18, the gas detection device 21, and the first audible and visual alarm 1. The first gas detection device 18 includes a second housing 12. Inside the second housing 12 are a sample gas collection chamber 17 and a gas detection chamber 33. Each side of the sample gas collection chamber 17 has an air inlet 29, through which a sample gas pipeline 6 passes. Inside the sample gas collection chamber 17 is a gas collection module 16. Inside the sample gas collection chamber 17 are two first lenses 9 and two first... The lens 9 divides the interior of the sample gas collection chamber 17 into a first chamber 8, a detection chamber 10, and a second chamber 14 in sequence. The first chamber 8 is equipped with a first signal detection element 7, and the second chamber 14 is equipped with a first laser emitter 15. The detection chamber 10 is connected to the gas collection module 16 through a connecting pipe 13, and an exhaust port 11 is provided on one side of the detection chamber 10. The gas collection module 16, the first signal detection element 7, and the first laser emitter 15 are electrically connected to the controller 2, and the gas collection module 16 is mechanically connected to the sample gas pipeline 6. The flame detection device 21 includes a third housing 28, on which a second audible and visual alarm 30 is provided. Inside the third housing 28, a second power module 22, a flame detection device 27, and a second gas detection device 32 are provided. A movable coupling 19 passes through the third housing 28 and is mechanically connected to the second power module 22. The second power module 22, the second audible and visual alarm 30, the flame detection device 27, and the second gas detection device 32 are electrically connected to the controller 2.

[0026] Example 2: A gas detection and alarm device includes a first housing 3. Inside the first housing 3 are a controller 2 and a first power module 20. The first power module 20 is mechanically connected to one end of a movable seat 5. The other end of the movable seat 5 passes through the first housing 3 and is fixedly connected to a first gas detection device 18. One side of the first housing 3 is mechanically connected to one end of a movable shaft 19. The other end of the movable shaft 19 is hinged to a gas detection device 21. The first housing 3 also has an electrical interface 4 and a first audible and visual alarm 1. The controller 2 is electrically connected to the first power module 20, the first gas detection device 18, the gas detection device 21, and the first audible and visual alarm 1. The gas detection device 21 includes a third housing 28. The third housing 28 has... A second audible and visual alarm 30 is provided. A second power module 22, a flame detection device 27, and a second gas detection device 32 are housed inside the third housing 28. A movable coupling 19 passes through the third housing 28 and is mechanically connected to the second power module 22. The second power module 22, the second audible and visual alarm 30, the flame detection device 27, and the second gas detection device 32 are electrically connected to the controller 2. The second gas detection device 32 includes a fourth housing 31. A second laser emitter 23 and a second signal detection element 26 are housed inside the fourth housing 31. A second lens 24 is fixed on the inner wall of the fourth housing 31. The second laser emitter 23 and the second signal detection element 26 are electrically connected to the controller 2.

[0027] Example 3: A gas detection method, specifically including the following steps: Step 1, connect the controller 2 to the power supply through the electrical interface 4, and set two levels of gas alarm limits and eight detection points in the controller 2; Step 2, rotate the gas detection device 21 through the first power module 20 and the second power module 22, and stop rotating after the gas detection device 21 rotates to the first detection point. The ambient gas concentration is detected by the first gas detection device 18 and the second gas detection device 32. The process of the first gas detection device 18 detecting the ambient gas concentration is as follows: the controller 2 starts the gas acquisition module 16, and the gas acquisition module 16 draws the ambient gas into the detection chamber 10 through the sample gas pipeline 6. The controller 2 outputs a sample of the ambient gas every 2 seconds. A periodic current is supplied to the first laser emitter 15. Every 2 seconds, the first laser emitter 15 emits a laser beam of a wavelength selectively absorbed by a corresponding combustible or toxic gas, which is then sent to the first signal detection element 7. After passing through the gas, the laser beam is partially absorbed, reducing its spectral intensity. The absorption intensity is proportional to the gas concentration. The first signal detection element 7 calculates the gas type and concentration by measuring the laser spectral intensity and feeds this information back to the controller 2. The controller 2 controls the first audible and visual alarm 1 to issue a corresponding alarm based on the gas type and concentration. After the first laser emitter 15 has emitted all the laser beams of wavelengths that can be absorbed by combustible or toxic gases, the controller 2 continues to cycle the current output. If the gas being tested is combustible, a level two alarm is triggered indicating a fire. The pre-alarm process for the second gas detection device 32 to detect the surrounding gas concentration is as follows: A laser reflector 25 is placed at each detection point. The controller 2 outputs a periodic current to the second laser emitter 23 every 3 seconds. The second laser emitter 23 emits a laser beam of a wavelength selectively absorbed by the corresponding combustible or toxic gas to the laser reflector 25 every 3 seconds. The laser reflector 25 reflects the laser beam to the second signal detection element 26. The second signal detection element 26 calculates the gas type and concentration by measuring the laser spectral intensity and feeds it back to the controller 2. The controller 2 controls the second audible and visual alarm 30 to issue a corresponding alarm based on the gas type and concentration. The alarm continues until the second laser emitter 23 has emitted all the light that can be absorbed by combustible or toxic gases. After the gas or toxic gas absorbs the wavelength of the laser, the controller 2 stops outputting current. If the gas being tested is a combustible gas, the secondary alarm is a fire pre-alarm. During the rotation of the fire detection device 21, the flame detection device 27 detects the ultraviolet light produced by the combustion of the substance to detect the fire. If a fire occurs within the detection range, the flame detection device 27 sends the detected data to the controller 2, and the controller 2 controls the second audible and visual alarm 30 to issue a fire alarm. In step 3, after completing the detection at the first detection point, step 2 is repeated. During the rotation of the fire detection device 21 to the next detection point, the controller 2 restarts the output current to the second laser emitter 23. After all detection points are detected, the detection starts again from the first detection point.

[0028] Example 4: A gas detection method, specifically including the following steps: Step 1, connect the controller 2 to the power supply through the electrical interface 4, and set two levels of gas alarm limits and six detection points in the controller 2; Step 2, rotate the gas detection device 21 through the first power module 20 and the second power module 22, and stop rotating after the gas detection device 21 rotates to the first detection point. The ambient gas concentration is detected by the first gas detection device 18 and the second gas detection device 32. The process of the first gas detection device 18 detecting the ambient gas concentration is as follows: the controller 2 starts the gas acquisition module 16, and the gas acquisition module 16 draws the ambient gas into the detection chamber 10 through the sample gas pipeline 6. Controller 2 outputs a periodic current to the first laser emitter 15 every 3 seconds. The first laser emitter 15 emits a laser beam of a wavelength selectively absorbed by a flammable or toxic gas to the first signal detection element 7 every 3 seconds. The laser beam is partially absorbed after passing through the gas, reducing its spectral intensity. The absorption intensity is proportional to the gas concentration. The first signal detection element 7 calculates the gas type and concentration by measuring the laser spectral intensity and feeds this information back to controller 2. Controller 2 then controls the first audible and visual alarm 1 to issue a corresponding alarm based on the gas type and concentration. After the first laser emitter 15 has emitted all the laser beams of wavelengths absorbable by flammable or toxic gases, controller 2... The current continues to be output in a loop. If the gas being measured is a combustible gas, the level two alarm is a fire alarm. The process of the second gas detection device 32 detecting the surrounding gas concentration is as follows: a laser reflector 25 is arranged at each detection point. The controller 2 outputs a periodic current to the second laser emitter 23 every 2 seconds. The second laser emitter 23 emits a laser of a wavelength selectively absorbed by the corresponding combustible or toxic gas to the laser reflector 25 every 2 seconds. The laser reflector 25 reflects the laser to the second signal detection element 26. The second signal detection element 26 calculates the gas type and gas concentration by measuring the laser spectral intensity and feeds it back to the controller 2. The controller 2 then determines the gas type and concentration based on the gas concentration. The second audible and visual alarm 30, which controls the gas concentration, issues a corresponding alarm. After the second laser emitter 23 emits all the laser wavelengths that can be absorbed by combustible or toxic gases, the controller 2 stops outputting current. If the gas being tested is combustible, the secondary alarm is a fire pre-alarm. During the rotation of the gas detection device 21, the flame detection device 27 detects a fire. If a fire occurs, a fire alarm is triggered. Step 3: After completing the detection at the first detection point, step 2 is repeated. During the rotation of the gas detection device 21 to the next detection point, the controller 2 restarts outputting current to the second laser emitter 23. After all detection points are detected, the detection starts again from the first detection point.

Claims

1. A gas detection and alarm device, characterized in that, The first housing (3) includes a controller (2) and a first power module (20) inside the first housing (3). The first power module (20) is mechanically connected to one end of a movable seat (5). The other end of the movable seat (5) passes through the first housing (3) and is fixedly connected to a first gas detection device (18). One side of the first housing (3) is mechanically connected to one end of a movable shaft (19). The other end of the movable shaft (19) is hinged to a fire detection device (21). The first housing (3) is also provided with an electrical interface (4) and a first audible and visual alarm (1). The controller (2) is electrically connected to the first power module (20), the first gas detection device (18), the fire detection device (21), and the first audible and visual alarm (1).

2. The fire detection and alarm device according to claim 1, characterized in that, The first gas detection device (18) includes a second housing (12), inside which a sample gas collection chamber (17) and a gas detection chamber (33) are arranged. Each side of the sample gas collection chamber (17) is provided with an air inlet (29), and a sample gas pipeline (6) is provided through the two air inlets (29). A gas collection module (16) is provided inside the sample gas collection chamber (17). The sample gas collection chamber (17) is provided with two first lenses (9), and the two first lenses (9) divide the sample gas collection chamber (17) into a first chamber (8) and a detection chamber in sequence. (10) Second chamber (14), the first chamber (8) is provided with a first signal detection element (7), the second chamber (14) is provided with a first laser emitter (15), the detection chamber (10) is connected to the gas collection module (16) through a connecting pipe (13), and an exhaust port (11) is provided on one side of the detection chamber (10); the gas collection module (16), the first signal detection element (7), and the first laser emitter (15) are electrically connected to the controller (2), and the gas collection module (16) is mechanically connected to the sample gas pipeline (6).

3. The fire detection and alarm device according to claim 1 or 2, characterized in that, The fire detection device (21) includes a third housing (28), on which a second audible and visual alarm (30) is provided. Inside the third housing (28) are a second power module (22), a flame detection device (27), and a second gas detection device (32). A movable coupling (19) passes through the third housing (28) and is mechanically connected to the second power module (22). The second power module (22), the second audible and visual alarm (30), the flame detection device (27), and the second gas detection device (32) are electrically connected to the controller (2).

4. The fire detection and alarm device according to claim 3, characterized in that, The second gas detection device (32) includes a fourth housing (31), inside which a second laser emitter (23) and a second signal detection element (26) are provided. A second lens (24) is fixed on the inner wall of the fourth housing (31). The second laser emitter (23) and the second signal detection element (26) are electrically connected to the controller (2).

5. A method for detecting flammability, characterized in that, The fire detection alarm device according to claim 4 specifically includes the following steps: Step 1, connect the controller (2) to the power supply through the electrical interface (4), and set two levels of gas alarm limits and multiple detection points in the controller (2); Step 2, make the fire detection device (21) rotate through the first power module (20) and the second power module (22), and stop rotating after the fire detection device (21) rotates to the first detection point, and detect the surrounding gas concentration through the first gas detection device (18) and the second gas detection device (32). When the gas concentration exceeds the first level gas alarm limit, the first level alarm is triggered, and when it exceeds the second level gas alarm limit, the second level alarm is triggered; detect the fire through the flame detection device (27), and if a fire occurs, trigger the fire alarm; Step 3, after completing the detection of the first detection point, repeat step 2, and after all detection points are detected, start the detection again from the first detection point.

6. The fire detection method according to claim 5, characterized in that, The steps of the first gas detection device (18) in step 2 to detect the surrounding gas concentration are as follows: Step a, the controller (2) starts the gas acquisition module (16), and the gas acquisition module (16) draws the surrounding gas into the detection chamber (10) through the sample gas pipeline (6); Step b, the controller (2) outputs a periodic current to the first laser emitter (15) at intervals of ΔT1, and the first laser emitter (15) emits a laser of a wavelength selectively absorbed by the corresponding combustible gas or toxic gas to the first signal detection element (7) at intervals of ΔT1, and the first signal detection element (7) calculates the gas type and gas concentration by measuring the laser spectrum intensity and feeds it back to the controller (2), and the controller (2) controls the first audible and visual alarm (1) to issue the corresponding alarm according to the gas type and gas concentration. After the first laser emitter (15) emits all the laser wavelengths that can be absorbed by combustible gas or toxic gas, the controller (2) continues to output current in a cycle; if the gas being tested is combustible gas, the secondary alarm is a fire pre-alarm.

7. The fire detection method according to claim 5, characterized in that, The steps of the second gas detection device (32) in step 2 to detect the surrounding gas concentration are as follows: Step c, a laser reflector (25) is arranged at each detection point; Step d, the controller (2) outputs a periodic current to the second laser emitter (23) at intervals of ΔT2, and the second laser emitter (23) emits a laser of a wavelength selectively absorbed by the corresponding combustible gas or toxic gas to the laser reflector (25) at intervals of ΔT2, and the laser reflector (25) reflects the laser to the second signal detection element (26), and the second signal detection element (26) calculates the gas type and gas concentration by measuring the laser spectrum intensity and feeds it back to the controller (2), and the controller (2) controls the second audible and visual alarm (30) to issue the corresponding alarm according to the gas type and gas concentration. After the second laser emitter (23) has emitted all the laser wavelengths that can be absorbed by combustible gas or toxic gas, the controller (2) stops outputting current; if the gas being measured is combustible gas, then the secondary alarm is a fire pre-alarm.

8. The fire detection method according to claim 5, characterized in that, In step 2, the flame detection device (27) detects fire by detecting the ultraviolet light produced by the combustion of materials. If a fire occurs within the detection range, the flame detection device (27) sends the detected data to the controller (2), and the controller (2) controls the second audible and visual alarm (30) to issue a fire alarm.

9. The fire detection method according to claim 7, characterized in that, In step 3, during the process of the fire detection device (21) rotating to the next detection point, the controller (2) restarts the output current to the second laser emitter (23).

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