Automatic fire extinguishing alarm device

Abstract

An automatic fire extinguishing alarm device belongs to the technical field of alarm devices. The device comprises a detection unit, the detection unit is used for detecting the fire probability of the power socket, the detection unit comprises a first air pipe type detector laid along the bottom surface of the power socket, the first air pipe type detector comprises a first air pipe and a first piston, the first end of the first air pipe is closed, and the second end of the first air pipe is open; the first piston is arranged near the second end in the first air pipe, and a cavity between the first piston and the first end of the first air pipe is filled with air with set mass; the temperature change of the bottom surface of the power socket contacted with the first air pipe is detected according to the position change of the first piston in the first air pipe. The automatic fire extinguishing alarm device is simple in structure, low in cost and capable of being widely used.

Description

Technical Field

[0001] The invention relates to an automatic fire extinguishing alarm device, belonging to the technical field of fire protection. Background Art

[0002] According to statistics, the majority of fires in homes and offices are caused by electrical outlets. Homes and offices are heavily populated with power outlets, which are connected to a variety of electrical devices. The main causes of fires include: leaving a charger plugged in for extended periods, which can cause internal short circuits; high-power appliances causing heat buildup in the outlets; randomly connecting outlets and leaving them powered on for extended periods; and leaving mobile phones charging overnight, which can cause thermal runaway of lithium batteries.

[0003] To address these issues, various fire alarm systems are currently available. However, increasing the sensitivity of existing fire alarm systems for early fire warnings can easily lead to unintended fire alarms and fire extinguishing, potentially causing secondary disasters. In the case of thermal sensors, increasing their sensitivity can cause them to react to temperature and air pressure fluctuations caused by factors such as weather, air conditioners, and cooking appliances, potentially triggering unintended fire alarms and fire extinguishing, potentially leading to secondary disasters. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide an automatic fire extinguishing alarm device, which will not malfunction and prevent secondary disasters; it has a simple structure, low cost and can be widely used.

[0005] To achieve the objectives of the invention, the present invention provides an automatic fire extinguishing alarm device, which includes a detection unit, which is used to detect the probability of a fire occurring in a power socket. The detection unit includes: a first air tube detector laid along the bottom surface of the power socket, the first air tube detector including a first air tube and a first piston, the first end of the first air tube is sealed, and the second end is open, the first piston is arranged near the second end of the first air tube, and the cavity between the first piston and the first end of the first air tube is filled with a set mass of air; based on the position change of the first piston in the first air tube, the temperature change of the bottom surface of the power socket contacted by the first air tube is detected to further determine different values ​​of the probability of a fire occurring.

[0006] Preferably, the automatic fire extinguishing alarm device further comprises a control unit and a communication unit, wherein the control unit comprises a first comparison module, the first comparison module being configured to compare the probability of fire occurrence with a first threshold value, and when the probability of fire occurrence is greater than or equal to the first threshold value, the control unit sends a sensitivity change instruction to the smoke detector via the communication unit, and when the smoke detector receives the sensitivity change instruction from the automatic fire extinguishing alarm device, it lowers the light threshold value for judging fire, thereby increasing sensitivity.

[0007] Preferably, the automatic fire extinguishing alarm device also includes an ignition unit and a fire extinguishing agent box, the ignition unit includes an ignitable heat-sensitive wire, the first end of the ignitable heat-sensitive wire is in contact with the bottom surface of the power socket, and the second end is in contact with the fire extinguishing agent in the fire extinguishing agent box; the first comparison module compares the probability of fire with the second threshold value. When the probability of fire is greater than or equal to the second threshold value, the control unit controls the ignition unit to ignite the fire extinguishing agent in the fire extinguishing agent box to generate fire extinguishing gas, and the second threshold value is greater than the first threshold value.

[0008] Preferably, the first air tube detector also includes a first converter, the first converter includes N first conversion units and a first mapper, each first conversion unit includes a first contact arranged along the wall of the first air tube, the first contact includes a first light-emitting unit and a first light-receiving unit, the output end of the first light-receiving unit is connected to the first mapper for providing an electrical signal to the first mapper; the first mapper maps the electrical signals provided by the N first conversion units into different probability values ​​of fire occurrence, N is a positive integer greater than or equal to 4; the length of the first piston along the axial direction of the first air tube is equal to the distance between two adjacent first contacts.

[0009] Preferably, the detection unit also includes: a second air tube type detector laid away from the power socket, the second air tube type detector includes a second air tube and a second piston, wherein the first end of the second air tube is sealed and the second end is open, the second piston is arranged near the second end in the second air tube, and the cavity between the second piston and the first end of the second air tube is filled with a set mass of air; the gas pressure change in the space where the second air tube is located is detected by detecting the change in pressure according to the position of the second piston in the second air tube.

[0010] Preferably, the second air tube detector also includes a second converter, the second converter includes M second conversion units and a second mapper, each second conversion unit includes a second contact arranged along the wall of the second air tube, the second contact includes a second light-emitting unit and a second light-receiving unit, and the output end of the second light-receiving unit is connected to the second mapper for providing an electrical signal to the second mapper; the second mapper maps the electrical signals provided by the M second conversion units into different pressure values ​​in the space where the second air tube is located, M is a positive integer greater than or equal to 2; the length of the second piston along the axial direction of the second air tube is equal to the distance between two adjacent second contacts.

[0011] Preferably, the control unit sends the probability of fire occurrence to the remote terminal via the communication unit.

[0012] Preferably, the control unit sends the probability of fire occurrence to the remote terminal via the communication unit.

[0013] Preferably, when the smoke detector receives a signal from the automatic fire extinguishing alarm device that the probability of fire occurring is lower than a first threshold, the smoke detector reduces its sensitivity and returns to its original sensitivity.

[0014] Preferably, the fire extinguishing agent includes at least an aerosol fire extinguishing agent.

[0015] Compared with the prior art, the automatic fire extinguishing alarm device provided by the present invention will not malfunction and thus prevent secondary disasters; it has a simple structure, low cost, and can be widely used. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the composition of the automatic fire extinguishing alarm system provided by the present invention.

[0017] Figure 2 It is a block diagram of the composition of the automatic fire extinguishing alarm device provided by the present invention.

[0018] Figure 3 It is a schematic diagram of the composition of the first air tube detector provided by the present invention.

[0019] Figure 4 is a circuit diagram of the first converter provided by the present invention.

[0020] Figure 5 It is a schematic diagram of the composition of the second air tube detector provided by the present invention.

[0021] Figure 6 is a circuit diagram of the second converter provided by the present invention. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] Figure 1 Schematic diagram of the automatic fire extinguishing alarm system provided by the present invention. Figure 1As shown, the automatic fire extinguishing alarm system provided in the first embodiment includes multiple automatic fire extinguishing alarm devices and multiple smoke detectors. The automatic fire extinguishing alarm devices include, for example, automatic fire extinguishing alarm device 1, ..., automatic fire extinguishing alarm device K, where K is greater than or equal to 1; and the smoke detectors include, for example, smoke detector 1, ..., smoke detector P, where P is greater than or equal to 1. The automatic fire extinguishing alarm devices are installed within the protective housing of the charging sockets, and the smoke detectors are located in the monitored area. Both the automatic fire extinguishing alarm devices and the smoke detectors include communication units that can communicate via a wireless network, preferably a 5G network. The data of the automatic fire extinguishing alarm devices is determined by the number of charging sockets to be protected; the number of smoke detectors to be installed is determined by installation conditions such as the area of ​​the monitored area.

[0024] Figure 2 This is a block diagram of the automatic fire extinguishing alarm device provided by the present invention, such as Figure 2 As shown, the automatic fire extinguishing alarm device provided in the first embodiment of the present invention includes a detection unit, a control unit, and a communication unit. The detection unit is used to detect the probability of a fire occurring in a power socket. The control unit includes a first comparison module, which is used to compare the probability of a fire occurring with a first threshold. When the probability of a fire occurring is greater than or equal to the first threshold, the control unit sends a sensitivity change instruction to the smoke detector via the communication unit. When the smoke detector receives the sensitivity change instruction from the automatic fire extinguishing alarm device, it lowers the light intensity threshold for determining a fire, thereby increasing its sensitivity. The control unit also includes a second comparison module, which compares the rate of increase in gas pressure in the container where the automatic fire extinguishing alarm is located with a third threshold. When the rate of increase in gas pressure in the container where the automatic fire extinguishing alarm is located is greater than or equal to the third threshold, it indicates that the fire extinguishing agent has ignited.

[0025] In the present invention, the automatic fire extinguishing alarm device also includes an ignition unit and a fire extinguishing agent box. The ignition unit includes a heat-sensitive wire that can be ignited. The first end of the ignitable heat-sensitive wire is in contact with the bottom surface of the power socket, and the second end is in contact with the fire extinguishing agent in the fire extinguishing agent box. The first comparison module is also used to compare the probability of fire with the second threshold value. When the probability is greater than or equal to the second threshold value, the control unit controls the ignition unit to ignite the fire extinguishing agent in the fire extinguishing agent box to generate fire extinguishing gas. The second threshold value is greater than the first threshold value.

[0026] In the present invention, the control unit transmits the probability of fire occurrence to a remote terminal via a communication unit. The remote terminal may be, for example, a user's handheld terminal, which has an application installed that is paired with the automatic fire extinguishing alarm device. The user can use the application to keep track of the probability of fire occurring in the space where the automatic fire extinguishing alarm device is located.

[0027] In the present invention, the fire extinguishing agent comprises at least an aerosol fire extinguishing agent. This aerosol fire extinguishing agent uses food-grade raw materials and is safe and harmless to humans. The aerosol fire extinguishing agent's fire extinguishing principle is as follows: Ionic potassium oxide released by the aerosol fire extinguishing agent has a universally uniform effect, achieving full flooding coverage of the entire protected area. Upon contact with the fire source, it combines with flame free radicals, repeatedly interrupting the flame free radical reaction chain to form stable non-combustible products, ultimately interrupting the flame chain and achieving the purpose of extinguishing the fire without depleting the ambient oxygen content. The gas released by the aerosol fire extinguishing agent can remain suspended in the protected room or enclosure for at least 30 minutes, effectively and continuously suppressing the spread or re-ignition of the fire.

[0028] This safe, non-toxic aerosol fire extinguisher can handle Class A (solid material fires), Class B (liquid or soluble solid material fires), Class C (gas fires), Class E (electrical fires), and Class F (cooked items in cooking appliances). This safe, non-toxic aerosol fire extinguisher can be stored in a temperature range of -60 to +160°C, is resistant to vibration and turbulence, and is stored in a solid state. It activates when temperatures exceed 410°C, converting from solid to gaseous, making it suitable for use as a small, automatic fire extinguisher.

[0029] In the present invention, the detection unit includes: a first air tube detector laid along the bottom surface of the power socket.

[0030] Figure 3 Schematic diagram of the composition of the first air tube detector provided by the present invention, such as Figure 3 As shown, the first air tube detector includes a first air tube 11 and a first piston 12. The first end of the first air tube is sealed and the second end is open. The first piston is positioned within the first air tube near the second end, and a cavity 14 between the first piston and the first end of the first air tube is filled with a predetermined mass of air. The position of the first piston within the first air tube is used to detect changes in the ambient temperature of the space where the first air tube is located, thereby further determining different values ​​of the probability of fire. In the present invention, the first air tube can be made of a material with a high heat transfer rate. The first air tube does not necessarily have to be straight; it can be a spiral shape or any other shape that conforms to the bottom surface of the power socket.

[0031] In the present invention, the first air tube detector further includes N first contacts 13 arranged along the displacement direction of the first air tube and a first converter, where N is a positive integer greater than or equal to 4, and the length of the first piston along the axial direction of the first air tube is equal to the distance between two adjacent first contacts. As the pressure of the air in the first air tube changes, the first piston triggers different first contacts; the first converter converts the different first contacts triggered by the first piston into different probabilities of fire.

[0032] Figure 4 is a circuit diagram of a first converter provided by the first embodiment of the present invention, such as Figure 4 As shown, the first converter includes N first conversion units and a first mapper. Each first conversion unit includes a first contact arranged along the wall of the first air tube. The first contact includes a first light-emitting unit and a first light-receiving unit. The first light-emitting unit and the first light-receiving unit are symmetrically arranged on the wall of the first air tube. When the first piston moves in response to the gas pressure in the cavity between the first piston and the first end of the first air tube, the light emitted by the first light-emitting unit is blocked, thereby determining the position of the first piston within the first air tube based on the light received by the first light-receiving unit. The output end of the light-receiving unit is connected to the first mapper to provide an electrical signal to the first mapper; the first mapper maps the electrical signals provided by the N first conversion units into different probability values ​​of fire occurrence, where N is a positive integer greater than or equal to 4. The N first contacts are evenly arranged along the tube wall near the second end of the first air tube. Figure 4 In the figure, the 11th conversion unit includes a light-emitting diode D11 and a phototransistor T11. The positive terminal of the light-emitting diode D11 is connected to the power supply EC through a resistor R111, and the negative terminal is grounded. The collector of the phototransistor is connected to the power supply EC through a resistor R112, the emitter is grounded, and the collector is connected to the first mapper. The light-emitting diode D11 is the light-emitting unit of the first contact, and the phototransistor T11 is the light-receiving unit of the first contact. Similarly, the Nth conversion unit includes a light-emitting diode D1N and a phototransistor T1N. The positive terminal of the light-emitting diode D1N is connected to the power supply EC through a resistor R1N1, and the negative terminal is grounded. The collector of the phototransistor is connected to the power supply EC through a resistor R1N2, the emitter is grounded, and the collector is connected to the first mapper. The light-emitting diode D1N is the light-emitting unit of the Nth contact, and the phototransistor T1N is the light-receiving unit of the Nth contact.

[0033] The first mapper establishes a mapping relationship between the situation where the first piston triggers N first contacts from left to right and N probability values ​​of fire occurrence. Taking N as 4 as an example, the first mapper is shown in Table 1 below:

[0034] Table 1: The voltage level of the collectors of the 4 phototransistors Probability of fire The first piston triggers the first contact from left to right 1，0，0，0 <![CDATA[P1]]> The first piston triggers the second contact from left to right 0，1，0，0 <![CDATA[P2]]> The first piston triggers the third contact from left to right 0，0，1，0 <![CDATA[P3]]> The first piston triggers the 4th contact from left to right 0，0，0，1 <![CDATA[P4]]> .

[0035] In Table 1, 1 represents a high level and 0 represents a low level.

[0036] The first air tube detector checks the probability of fire based on the following gas law: T = PV / C, where T is the gas temperature, V is the gas volume, P is the gas pressure, and C is a constant. When the object the first air tube contacts, such as a power socket, heats up, the air pressure within the first air tube increases. The pressure of the gas in the space surrounding the first air tube also increases due to the heat dissipated by the hot power socket. However, due to the high air pressure within the first air tube and the low pressure within the space surrounding the first air tube, the air in the first air tube pushes the first piston in a first direction, for example, from left to right. The displacement of the first piston is related to the temperature of the hot power socket: the higher the temperature of the hot power socket, the greater the displacement of the first piston in the first direction. Therefore, the temperature of the hot power socket can be determined based on the displacement of the first piston in the first direction. N contacts are provided near the second end of the first air tube. A one-to-one correspondence is established between the position of the first contact and the temperature of the hot object it contacts. Furthermore, a one-to-one correspondence is established between the position of the first contact and the probability of fire. Therefore, the probability of fire can be determined based on which contact the first piston triggers.

[0037] In the present invention, the detection unit includes: a second air tube type detector arranged away from the power socket.

[0038] Figure 5 FIG. 1 is a schematic diagram of the composition of the second air tube detector provided by the first embodiment of the present invention, as shown in FIG. Figure 5 As shown, the second air tube detector includes a second air tube 21 and a second piston 22. The first end of the second air tube is sealed, while the second end is open. The second piston is positioned within the second air tube near the second end, and a cavity 24 between the second piston and the first end of the second air tube is filled with a predetermined mass of air. Pressure changes are detected based on the position of the second piston within the second air tube to detect changes in gas pressure within the space where the second air tube is located. In the present invention, the second air tube can be made of a material with a high heat transfer rate. The second air tube does not need to be straight; it can be spiral or any other shape that is compatible with the mounting surface.

[0039] The second air tube detector further includes M second contacts 23 and a second converter arranged at equal intervals near the second end of the second air tube. The length of the second piston along the axial direction of the second air tube is equal to the distance between two adjacent second contacts.

[0040] Figure 6 is a circuit diagram of the second converter provided by the present invention, such as Figure 6As shown, the second converter includes M second conversion units and a second mapper. Each second conversion unit includes a second contact located along the wall of the second air tube. As the pressure of the gas in the space within the second air tube changes, the second piston triggers different second contacts. The second converter converts the different second contacts triggered by the second piston into different pressure values ​​in the space within the second air tube. The second contacts include a second light-emitting unit and a second light-receiving unit, symmetrically arranged on the wall of the second air tube. As the second piston moves in response to the pressure of the gas outside the second air tube, the light emitted by the second light-emitting unit is blocked. The position of the second piston within the second air tube and, further, the gas pressure in the space within the second air tube can be determined based on the light received by the second light-receiving unit. The output of the second light-receiving unit is connected to the second mapper to provide an electrical signal to the second mapper. The second mapper maps the electrical signals provided by the M second conversion units into different pressure values ​​in the space within the second air tube, where M is a positive integer greater than or equal to 2. The M second contacts are equally spaced near the second end of the second air tube. Figure 6 In the figure, the 21st conversion unit includes a light-emitting diode D21 and a phototransistor T21. The positive terminal of the light-emitting diode D21 is connected to the power supply EC through a resistor R211, and the negative terminal is grounded. The collector of the phototransistor T21 is connected to the power supply EC through a resistor R212, the emitter is grounded, and the collector is connected to the second mapper. The light-emitting diode D21 is the second light-emitting unit of the 21st contact, and the phototransistor T21 is the second light-receiving unit of the 21st contact. Similarly, the Mth conversion unit includes a light-emitting diode D2M and a phototransistor T2M. The positive terminal of the light-emitting diode D2M is connected to the power supply EC through a resistor R2M1, and the negative terminal is grounded. The collector of the phototransistor T2M is connected to the power supply EC through a resistor R2M2, the emitter is grounded, and the collector is connected to the second mapper. The light-emitting diode D2M is the second light-emitting unit of the Mth contact, and the phototransistor T2M is the second light-receiving unit of the Mth contact.

[0041] The second mapper establishes a mapping relationship between the state of the second piston triggering the M second contacts from right to left and the M pressure values ​​in the space where the second air tube is located. For example, taking M as 4, the second mapper is shown in Table 2 below:

[0042] Table 2: The voltage level of the collectors of the 4 phototransistors Space pressure value The second piston triggers the first contact from right to left 1，0，0，0 <![CDATA[F1]]> The second piston triggers the second contact from right to left 0，1，0，0 <![CDATA[F2]]> The second piston triggers the third contact from right to left 0，0，1，0 <![CDATA[F3]]> The second piston triggers the fourth contact from right to left 0，0，0，1 <![CDATA[F4]]> .

[0043] In Table 1, 1 represents a high level and 0 represents a low level.

[0044] The second air tube detector checks the gas pressure in the space it is located in based on the principle of the gas equation of state. When the fire extinguishing agent in the fire extinguishing agent container ignites, a large amount of gas is generated. The gas pressure in the space where the automatic fire alarm device is located increases, exceeding the pressure of the gas in the second air tube. The gas in the space where the automatic fire alarm device is located pushes the second piston in a second direction. For example, from right to left, the displacement of the second piston is related to the gas pressure in the space where the automatic fire alarm device is located. The higher the gas pressure in the space where the automatic fire alarm device is located, the greater the displacement of the second piston in the second direction. Therefore, the gas pressure in the space where the automatic fire alarm device is located can be determined based on the displacement of the second piston in the second direction. M contacts are provided near the free end of the second air tube. A one-to-one correspondence is established between the contact positions and the gas pressure in the space where the automatic fire alarm device is located. Therefore, the gas pressure in the space where the automatic fire alarm device is located can be determined based on the second contacts triggered by the second piston.

[0045] The present invention also provides an automatic fire extinguishing alarm method, which comprises the following steps: S01: receiving the probability of fire provided by the first mapper; S02: The probability of a fire is compared with the first threshold value by a comparator, if the probability of a fire is greater than or equal to the first threshold value, step 03 is executed; if not, the process returns to step S01; S03: Send the probability value of fire to the remote terminal and send a sensitivity change instruction to the smoke detector. The remote terminal determines whether to turn off the main switch or escape based on the received probability value. The smoke detector changes its sensitivity according to the received instruction. S04: Continue to receive the probability of fire occurrence provided by the first mapper; S05: Determine whether the probability of fire is greater than or equal to the second threshold; if so, execute step 06; if not, return to step S04; S06: The ignition unit ignites the fire extinguishing agent in the fire extinguishing agent box; S07: receiving the pressure provided by the second mapper; S08: The second comparison module compares the rate of increase of the gas pressure in the container where the automatic fire extinguishing alarm is located with the third threshold. If the rate of increase of the gas pressure in the container where the automatic fire extinguishing alarm is located is greater than or equal to the third threshold, it indicates that the fire extinguishing agent has been ignited, and the process ends; if not, the process returns to step S06.

[0046] Next, we'll describe the steps involved in the smoke detector process. The smoke detector periodically detects incoming smoke using a smoke sensing unit. During detection, it monitors the presence of smoke based on a set light threshold of a photoelectric element. Then, when the scattered light based on the smoke concentration exceeds the light threshold (equivalent to the smoke threshold), it determines a fire. If the smoke concentration exceeds the smoke threshold and a fire is determined, the smoke detector outputs a fire signal to a remote terminal via the communication unit as part of the fire process. If a fire is not confirmed, the detector determines whether a sensitivity change notification has been received from the automatic fire extinguishing alarm system. If no sensitivity change notification has been received, the detector returns to smoke detection. If a sensitivity change notification has been received, the detector adjusts the sensitivity.

[0047] The automatic fire alarm system provided by the first embodiment of the present invention, even when detecting a change exceeding a first threshold due to weather conditions, air conditioners, or the like, will not issue a fire alarm unless the smoke detector, having switched to a high-sensitivity state, detects smoke. This reduces the risk of non-fire notifications. Furthermore, the smoke detector's high-sensitivity fire notification is limited to situations where the probability of fire detected by the first air duct detector exceeds the first threshold, resulting in a sensitivity change notification. This also reduces the risk of non-fire notifications due to tobacco smoke, etc.

[0048] Alternatively, the detection unit may be a thermocouple, thermal semiconductor, or electronic cable type. In the thermocouple type, the electromotive force generated by a thermocouple installed on the surface of a heating power outlet is measured to detect a fire. If the electromotive force exceeds a third threshold, a sensitivity change notification is sent to the smoke detector. If it exceeds a fourth threshold, a fire alarm is generated through fire detection. The same principle applies to thermal semiconductors that detect changes in resistance and electronic cable types that use an electronic cable equipped with a temperature sensor.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined. "Several" means one or more, unless otherwise specifically defined.

[0050] The terms "left", "right", "up", "down", etc. only refer to the left, right, up and down directions of components in the drawings, and may change according to the installation angle in actual application.

[0051] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic fire extinguishing alarm device, comprising a detection unit for detecting the probability of a fire occurring in a power socket, characterized in that: The detection unit includes: a first air tube detector laid along the bottom surface of the power socket, the first air tube detector including a first air tube and a first piston, the first end of the first air tube is sealed and the second end is open, the first piston is arranged near the second end of the first air tube, and the cavity between the first piston and the first end of the first air tube is filled with a set mass of air; the temperature change of the bottom surface of the power socket contacted by the first air tube is detected according to the position change of the first piston in the first air tube.

2. The automatic fire extinguishing alarm device according to claim 1, characterized in that: It also includes a control unit and a communication unit. The control unit includes a first comparison module, which is used to compare the probability of fire with a first threshold. When the probability of fire is greater than or equal to the first threshold, the control unit sends an instruction to change the sensitivity to the smoke detector through the communication unit. When the smoke detector receives the instruction to change the sensitivity from the automatic fire extinguishing alarm device, it lowers the light threshold for judging a fire, thereby improving the sensitivity.

3. The automatic fire extinguishing alarm device according to claim 1, characterized in that: The invention also includes an ignition unit and a fire extinguishing agent box, wherein the ignition unit includes a heat-sensitive wire capable of being ignited, wherein a first end of the heat-sensitive wire is in contact with the bottom surface of the power socket, and a second end of the heat-sensitive wire is in contact with the fire extinguishing agent in the fire extinguishing agent box; The first comparison module compares the probability of fire with a second threshold. When the probability of fire is greater than or equal to the second threshold, the control unit controls the ignition unit to ignite the fire extinguishing agent in the fire extinguishing agent box to generate fire extinguishing gas. The second threshold is greater than the first threshold.

4. The automatic fire extinguishing alarm device according to claim 3, characterized in that: The first air tube detector also includes a first converter, which includes N first conversion units and a first mapper. Each first conversion unit includes a first contact arranged along the wall of the first air tube. The first contact includes a first light-emitting unit and a first light-receiving unit. The output end of the first light-receiving unit is connected to the first mapper via a first retainer for providing an electrical signal to the first mapper. The first mapper maps the electrical signals provided by the N first conversion units into different probability values ​​of fire occurrence, where N is a positive integer greater than or equal to 4. The axial length of the first piston along the second end of the first air tube is equal to the distance between two adjacent first contacts. The first retainer includes a first capacitor and a first electrically controlled switch. The first end and the second end of the electrically controlled switch are respectively connected to the two ends of the capacitor, and the control end is connected to the output end of the adjacent first light-receiving unit.

5. The automatic fire extinguishing alarm device according to claim 4, characterized in that: The detection unit also includes: a second air tube type detector laid away from the power socket, the second air tube type detector includes a second air tube and a second piston, wherein the first end of the second air tube is sealed and the second end is open, the second piston is arranged near the second end in the second air tube, and the cavity between the second piston and the first end of the second air tube is filled with a set mass of air; the gas pressure change in the space where the second air tube is located is detected according to the change in pressure detected by the position of the second piston in the second air tube.

6. The automatic fire extinguishing alarm device according to claim 5, characterized in that: The second air tube detector further includes a second converter, the second converter including M second conversion units and a second mapper, each second conversion unit including a second contact arranged along the wall of the second air tube, the second contact including a second light emitting unit and a second light receiving unit, an output end of the second light receiving unit being connected to the second mapper via a second holder for providing an electrical signal to the second mapper; The second mapper maps the electrical signals provided by M second conversion units into different pressure values ​​in the space where the second air tube is located, where M is a positive integer greater than or equal to 2; the axial length of the second piston along the second end of the second air tube is equal to the distance between two adjacent second contacts; the second retainer includes a second capacitor and a second electrically controlled switch, the first end and the second end of the second electrically controlled switch are respectively connected to the two ends of the second capacitor, and the control end is connected to the output end of the adjacent second light receiving unit.

7. The automatic fire extinguishing alarm device according to any one of claims 3 to 6, characterized in that: The control unit sends the probability of fire occurrence to the remote terminal through the communication unit.

8. The automatic fire extinguishing alarm device according to claim 7, characterized in that: When the smoke detector receives information from the automatic fire extinguishing alarm device indicating that the probability of fire is lower than the first threshold, the smoke detector reduces its sensitivity and returns to its original sensitivity.

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