A temperature detection and early warning device for fire and its use method

Abstract

The present invention provides a temperature detection and early warning device for fire and a method of using the same, which relates to the field of temperature detection technology, including a protective shell and a temperature detector, wherein the protective shell is provided with a protective mechanism for protecting the temperature detector in case of fire, and the protective shell is provided with an early warning device for facilitating early warning of the temperature detector, wherein the protective mechanism includes an embedded plate, a circular shaft, a rack and a protective cover, and the early warning device includes an alarm and a C-shaped connecting rod, and a mounting groove is provided at the lower end of the protective shell. The present invention provides two protective covers to cooperate with each other, and when a fire occurs and the fire is large, the two protective covers can be automatically driven to close to each other to protect the temperature detector, so as to avoid the situation in which the flame burns the temperature detector and damages the temperature detector in case of a large fire, and can provide a good protective effect on the temperature detector in case of a fire.

Description

Technical Field

[0001] The present invention belongs to the technical field of temperature detection, and more specifically, particularly relates to a temperature detection and early warning device for fire and a use method thereof. Background Art

[0002] Fire temperature detection devices are devices used to detect temperature changes during fires. They play a vital role in fire alarm systems by monitoring rapid increases in ambient temperature to identify fires and trigger alarms.

[0003] The Chinese patent publication number is: CN103256996A, a temperature detection device, which can detect the temperature of electrical equipment in real time, and prevent and eliminate the occurrence of electrical fires from the source.

[0004] The existing temperature detection device has the following disadvantages:

[0005] The shell of the existing temperature detection device is generally made of fireproof and high temperature resistant materials to protect the internal electrical components. However, in order to ensure the accuracy of temperature detection, the detection probe area is not protected. As a result, when a fire occurs and the fire is large, the detection device cannot be protected in time, causing the detection device to be burned and damaged.

[0006] When in use, the existing temperature detection device can only give an early warning when a fire occurs. When the flame spreads and burns the detection probe area, the probe is damaged and the early warning cannot be performed, resulting in the staff being unable to understand the fire situation in time after the fire occurs, and the use has certain limitations.

[0007] Therefore, in view of this, the existing structure and defects are studied and improved, and a temperature detection and warning device for fire and a method of using the same are provided, in order to achieve a more practical purpose. Summary of the invention

[0008] In order to solve the above technical problems, the present invention provides a temperature detection and early warning device for fire and a method of using the same to solve the above problems.

[0009] A temperature detection and early warning device for fire, comprising a protective shell and a temperature detector, the protective shell being provided with a protective mechanism for protecting the temperature detector in case of fire, the protective shell being provided with an early warning device for facilitating the temperature detector to give an early warning, the protective mechanism comprising an inner panel, a round shaft, a rack and a protective cover, the early warning device comprising an alarm and a C-shaped connecting rod, the lower end of the protective shell being provided with a mounting groove, the inner panel being fixedly mounted on the inner side wall of the mounting groove, the temperature detector being located in the protective shell, the number of the round shafts being two, both of which are rotatably mounted on the side end of the inner panel, the number of the racks being two, the lower ends of the two racks being fixedly mounted with vertical poles, the side ends of the inner panel being fixedly mounted with mounting rods, two hanging pipes being fixedly mounted between the temperature detector and the mounting rod, the alarm being fixedly mounted on the inner side wall of the inner panel, the inner side wall of the protective shell being fixedly mounted with a partition plate, the upper end of the partition plate being fixedly mounted with an electrical component, the partition The upper end of the plate is also penetrated by two first circular grooves, and the electrical components are integrated with circuit boards, power supply equipment, signal processing equipment, and alarm systems. The upper end of the mounting rod is penetrated by two second circular grooves, and the side ends of the inner plate are provided with two T-shaped slide grooves, and the side ends of the inner plate are fixedly installed with C-shaped side rods, and the lower ends of the C-shaped side rods are fixedly installed with two magnetic blocks. The two side ends of the inner plate are penetrated by rectangular grooves, and the upper end of the alarm is provided with a button, and the circumferential ends of the two circular shafts are fixedly installed with gears, and the two racks are respectively meshed with the two gears. The side ends of the two vertical poles are fixedly installed with T-shaped sliders, and the two T-shaped sliders are respectively slidably installed on the inner side walls of the T-shaped slide grooves, and the side ends of the two vertical poles are fixedly installed with counterweights, and the material of the counterweights is iron. The side ends of the two vertical poles are fixedly installed with connecting rods, and the same C-shaped connecting rod is fixedly installed between the two connecting rods, and the C-shaped connecting rod is slidably installed on the inner side walls of the two rectangular grooves.

[0010] Preferably, two connecting wires are electrically connected between the temperature detector and the electrical element, and both of the two connecting wires pass through the inner wall of the hanging pipe.

[0011] Preferably, there are two protective covers, the side ends of the two protective covers are penetrated with a cylindrical groove, the two protective covers are fixedly mounted on the circumferential ends of the circular shaft through the cylindrical groove, and the side ends of the two protective covers are also penetrated with an avoidance groove.

[0012] A method for using a temperature detection and early warning device for fire, the steps of use are as follows:

[0013] S1: The ambient temperature is detected by the temperature detector. When it is detected that the temperature rises too fast, the signal will be fed back to the electrical components, thereby triggering an alarm;

[0014] S2: When the fire is large, the flame will burn the counterweight. When the temperature of the counterweight exceeds the Curie point of the counterweight, the counterweight will lose its magnetism.

[0015] S3: The counterweight loses its magnetism and moves downward, which drives the two protective covers to rotate and seal the temperature detector to protect it;

[0016] S4: When the C-shaped connecting rod moves downward, it presses the button on the alarm, thereby triggering the alarm to sound a secondary alarm.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] In the present invention, by setting up two protective covers to cooperate with each other, when a fire occurs and the fire is large, the two protective covers can be automatically driven to close to each other to protect the temperature detector, thereby preventing the flame from burning the temperature detector and causing damage to the temperature detector when the fire is large. In the event of a fire, the temperature detector can be better protected.

[0019] In the present invention, by setting up a counterweight block and a magnetic block to cooperate with each other, during daily use, the counterweight block and the magnetic block are adsorbed to each other, and the protective cover is in an open state at this time, which will not affect the normal temperature detection work of the temperature detector, and only when the flame burns the counterweight block to a temperature exceeding the Curie point, the counterweight block will lose its magnetism and move downward to drive the protective cover to close, which will not cause the protective cover to be mistakenly closed during a fire. When the fire does not endanger the use of the temperature detector, the normal temperature detection work of the temperature detector can be guaranteed, which is convenient for the staff to understand the fire situation.

[0020] In the present invention, by arranging the counterweight block below the temperature detector, when the fire gradually spreads upward, it will first burn the counterweight block, and then before the flame spreads and burns the temperature detector, it drives the protective cover to close and protect the temperature detector, thereby avoiding the possibility that the flame may burn the temperature detector as much as possible. The use of the device can not only ensure the temperature detector's detection of the fire temperature, but also protect the temperature detector without manual intervention, and is flexible to use.

[0021] In the present invention, by providing a counterweight block, after the fire is extinguished, the counterweight block is slowly cooled down, and the magnetic moments of the iron atoms in the counterweight block have enough time to rearrange, the magnetism of the counterweight block can be restored, and then it can be adsorbed by the magnetic block again, so that the device can be used repeatedly and has high practicality.

[0022] In the present invention, by setting an alarm, after the counterweight block is burned and loses its magnetism, the counterweight block moves downward and also drives the C-shaped connecting rod on the connecting rod to move downward. When the C-shaped connecting rod moves downward and presses the button, the alarm is activated for a secondary alarm. At this time, the protective cover closes the temperature detector, and the temperature detection of the temperature by the temperature detector is affected. The secondary alarm of the alarm can remind relevant personnel that the fire has spread to the installation position of the temperature detector, thereby giving an early warning, which is convenient for relevant personnel to formulate appropriate fire extinguishing plans in time according to the fire situation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the protective housing of the present invention;

[0024] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the overall structure of the inner panel of the present invention;

[0026] Figure 4 It is a schematic diagram of the overall structure of the electrical component of the present invention;

[0027] Figure 5 It is a schematic diagram of the overall structure of the protective cover of the present invention;

[0028] Figure 6 It is a schematic diagram of the overall structure of the temperature detector of the present invention;

[0029] Figure 7 It is a schematic diagram of the structure of the entire upright pole of the present invention;

[0030] Figure 8 It is a schematic structural diagram of the overall circular shaft of the present invention.

[0031] In the figure, the correspondence between the component names and the figure numbers is: 1. Protective shell; 11. Partition plate; 12. First circular groove; 13. Electrical component; 14. Mounting groove; 2. Embedded plate; 21. Mounting rod; 22. Second circular groove; 23. Lifting pipe; 24. T-shaped slide groove; 25. C-shaped side rod; 26. Magnetic block; 28. Rectangular groove; 3. Alarm; 31. Button; 4. Round shaft; 41. Gear; 5. Rack; 51. Vertical pole; 52. T-shaped slider; 53. Connecting rod; 54. C-shaped connecting rod; 55. Counterweight; 6. Temperature detector; 61. Connecting wires; 7. Protective cover; 71. Avoidance groove; 72. Column groove. DETAILED DESCRIPTION

[0032] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] See also Figure 1-Figure 8 The present invention provides a temperature detection and early warning device for fire, comprising a protective shell 1 and a temperature detector 6. The protective shell 1 is provided with a protective mechanism for protecting the temperature detector 6 in case of fire, and the protective shell 1 is provided with an early warning device for facilitating the temperature detector 6 to give an early warning. The protective shell 1, the first circular groove 12 and the inner panel 2 in the device can all be made of high temperature resistant materials, which are convenient for use in a high temperature environment of a fire, and the device is generally installed at a higher position, such as a ceiling, a suspended ceiling, etc. The relatively high position can reduce the influence of the airflow on the ground on the detection of the temperature detector 6;

[0034] The protection mechanism includes an inner panel 2, a circular shaft 4, a rack 5 and a protection cover 7. The early warning device includes an alarm 3 and a C-shaped connecting rod 54. A mounting groove 14 is opened at the lower end of the protection shell 1. The inner panel 2 is fixedly installed on the inner side wall of the mounting groove 14. The temperature detector 6 is located in the protection shell 1. There are two circular shafts 4, and the two circular shafts 4 are rotatably installed on the side ends of the inner panel 2. There are two racks 5. The lower ends of the two racks 5 are fixedly installed with a vertical pole 51. The side ends of the inner panel 2 are fixedly installed with a mounting rod 21. Two hanging pipes 23 are fixedly installed between the temperature detector 6 and the mounting rod 21. The alarm 3 is fixedly installed on the inner side wall of the inner panel 2. The inner side wall of the protection shell 1 is fixedly installed with a partition plate 11. The upper end of the partition plate 11 is fixedly installed An electrical component 13 is installed, and two first circular grooves 12 are also penetrated at the upper end of the partition plate 11. A circuit board, a power supply device, a signal processing device, and an alarm system are integrated on the electrical component 13. The temperature detector 6 in the device can detect the ambient temperature, identify a fire by monitoring the rapid increase in the ambient temperature, and trigger an alarm. The temperature detector 6 is a thermistor sensor. The temperature detector 6 feeds back the signal after identifying the rapidly increasing temperature. The signal processing device on the electrical component 13 is responsible for receiving the signal from the temperature detector 6. When it is detected that the temperature exceeds the preset fire warning value, the device will trigger the alarm system on the electrical component 13, sound an alarm or notify the terminal through the alarm system, thereby notifying the relevant personnel of the fire;

[0035] Two second circular grooves 22 are formed through the upper end of the mounting rod 21, and two T-shaped slide grooves 24 are formed on the side end of the inner panel 2. A C-shaped side rod 25 is fixedly installed on the side end of the inner panel 2, and two magnetic blocks 26 are fixedly installed on the lower end of the C-shaped side rod 25. Rectangular grooves 28 are formed through the two side ends of the inner panel 2. A button 31 is provided on the upper end of the alarm 3. After the counterweight block 55 is burned and loses its magnetism, the counterweight block 55 moves downward and also drives the connecting rod 53 to move downward. The connecting rod 53 moves downward and drives the C-shaped connecting rod 54 to move downward. When the C-shaped connecting rod 54 moves downward and presses the button 31, the alarm 3 is activated for a secondary alarm. At this time, the protective cover 7 closes the temperature detector 6, and the temperature detection of the temperature detector 6 is affected. The secondary alarm of the alarm 3 can remind relevant personnel that the fire has spread to the installation position of the temperature detector 6, thereby giving an early warning, so that relevant personnel can formulate appropriate fire extinguishing plans in time according to the fire situation.

[0036] Gears 41 are fixedly mounted on the circumferential ends of the two circular shafts 4, and the two racks 5 are respectively meshed with the two gears 41. T-shaped sliders 52 are fixedly mounted on the side ends of the two vertical rods 51. The two T-shaped sliders 52 are respectively slidably mounted on the inner side walls of the T-shaped slide groove 24. Counterweights 55 are fixedly mounted on the side ends of the two vertical rods 51. The material of the counterweights 55 is iron. In the case of a large fire, if the fire is close to the Figure 2 As shown, the counterweight block 55 in the present application is located below the temperature detector 6. When the flame spreads upward and burns, it will first burn to the counterweight block 55. The material of the counterweight block 55 is iron, and the Curie point of the iron material (some materials lose their magnetism in a high temperature environment, and this phenomenon is called the Curie point) is 770°C. When the flame is in the living environment, the temperature threshold of different materials when burning is about 800-1100°C. Therefore, when the flame burns the counterweight block 55, when the counterweight block 55 is heated to more than 770°C, the magnetic moment inside the material becomes disordered due to the thermal energy, and the material loses its ferromagnetism, that is, at this time, the counterweight block 55 loses its magnetism and is no longer adsorbed to the magnetic block 26;

[0037] The side ends of the two uprights 51 are fixedly installed with connecting rods 53, and the same C-shaped connecting rod 54 is fixedly installed between the two connecting rods 53. The C-shaped connecting rod 54 is slidably installed on the inner side walls of the two rectangular grooves 28. Two connecting wires 61 are electrically connected between the temperature detector 6 and the electrical component 13. The two connecting wires 61 pass through the inner side wall of the hanging tube 23. There are two protective covers 7. The side ends of the two protective covers 7 are penetrated by cylindrical grooves 72. The two protective covers 7 are fixedly installed on the circumferential ends of the circular shaft 4 through the cylindrical grooves 72. The two protective covers 7 An avoidance groove 71 is also provided through the side end portion, and the counterweight block 55 will move downward due to gravity. The downward movement of the counterweight block 55 will drive the vertical rod 51 to move downward, and the downward movement of the vertical rod 51 will drive the rack 5 to move downward. The downward movement of the rack 5 will drive the two gears 41 to rotate, and the rotation of the two gears 41 will drive the two circular shafts 4 to rotate in opposite directions. The rotation of the two circular shafts 4 will drive the two protective covers 7 to rotate. After the two protective covers 7 rotate and close to each other, they will protect the temperature detector 6. The protective cover 7 can be made of high-temperature resistant and heat-insulating material to protect the temperature detector 6.

[0038] Working principle:

[0039] In the first step, the protective shell 1, the first circular groove 12 and the inner panel 2 in the device can all be made of high temperature resistant materials, which are convenient for use in high temperature environments of fires, and the device is generally installed in a higher position, such as a ceiling, a suspended ceiling, etc. The relatively high position can reduce the impact of the airflow on the ground on the temperature detector 6 during detection. The temperature detector 6 in the device can detect the ambient temperature, identify the fire by monitoring the rapid increase of the ambient temperature, and trigger an alarm. The temperature detector 6 is a thermistor sensor. After the temperature detector 6 identifies the rapidly rising temperature, it feeds back the signal. The signal processing device on the electrical component 13 is responsible for receiving the temperature. When the temperature exceeds the preset fire alarm value, the device triggers the alarm system on the electrical component 13, sounds an alarm or notifies the terminal through the alarm system, and then notifies the relevant personnel of the fire. In the case of a large fire, the flame may spread upward to the temperature detector 6 area. After the flame burns the counterweight block 55 and the counterweight block 55 loses its magnetism, the counterweight block 55 is no longer attracted to the magnetic block 26 and moves downward, driving the rack 5 to move downward. The rack 5 moves downward and drives the gear 41 to rotate. At this time, the two circular shafts 4 drive the protective cover 7 to rotate to protect the temperature detector 6, thereby protecting the temperature detector 6.

[0040] The second step is to: if the fire is large, Figure 2As shown, the counterweight block 55 in the present application is located below the temperature detector 6. When the flame spreads upward and burns, it will first burn the counterweight block 55. The material of the counterweight block 55 is iron, and the Curie point of the iron material (some materials will lose their magnetism in a high temperature environment, and this temperature is called the Curie point) is 770°C. When the flame is in the living environment, the temperature threshold of different materials when burning is about 800-1100°C. Therefore, when the flame burns the counterweight block 55, when the counterweight block 55 is heated to more than 770°C, the magnetic moment inside the material becomes disordered due to the thermal energy, and the material loses its ferromagnetism, that is, at this time, the counterweight block 55 is heated to more than 770°C. The weight block 55 loses its magnetism and is no longer attracted to the magnetic block 26. The counterweight block 55 will move downward due to gravity. The counterweight block 55 will move downward, which will drive the vertical rod 51 to move downward. The vertical rod 51 will move downward, which will drive the rack 5 to move downward. The rack 5 will drive the two gears 41 to rotate. The rotation of the two gears 41 will drive the two circular shafts 4 to rotate in opposite directions. The rotation of the two circular shafts 4 will drive the two protective covers 7 to rotate. After the two protective covers 7 rotate and close to each other, they will protect the temperature detector 6. The protective cover 7 can be made of high temperature resistant and heat-insulating material to protect the temperature detector 6.

[0041] The device is provided with two protective covers 7 to cooperate with each other. When a fire occurs and the fire is large, the two protective covers 7 can be automatically driven to close each other to protect the temperature detector 6, so as to avoid the situation that the flame burns the temperature detector 6 and causes the temperature detector 6 to be damaged. In the event of a fire, the temperature detector 6 can be better protected.

[0042] The device is provided with a counterweight block 55 and a magnetic block 26 for matching. In daily use, the counterweight block 55 and the magnetic block 26 are attracted to each other. At this time, the protective cover 7 is in an open state, which will not affect the normal temperature detection work of the temperature detector 6. Only when the flame burns the counterweight block 55 to a temperature exceeding the Curie point, the counterweight block 55 will lose its magnetism and move downward to drive the protective cover 7 to close. It will not cause the protective cover 7 to fail to close in the event of a fire. When the fire does not endanger the use of the temperature detector 6, the normal temperature detection work of the temperature detector 6 can be guaranteed, which is convenient for the staff to understand the fire situation.

[0043] In the present device, by arranging the counterweight block 55 below the temperature detector 6, when the fire gradually spreads upward, the counterweight block 55 will be burned first, and then before the flame spreads and burns the temperature detector 6, the protective cover 7 is driven to close and protect the temperature detector 6, thereby avoiding the possibility that the flame may burn the temperature detector 6 as much as possible, so that the use of the device can not only ensure the temperature detector 6 to detect the fire temperature, but also protect the temperature detector 6 without manual intervention, and the use is flexible;

[0044] In the present device, by providing the counterweight block 55, after the fire is extinguished, the counterweight block 55 is slowly cooled down, and the magnetic moments of the iron atoms in the counterweight block 55 have enough time to rearrange, and the magnetism of the counterweight block 55 can be restored, and then it can be adsorbed with the magnetic block 26 again, so that the present device can be used repeatedly, and the practicality is high;

[0045] In the third step, after the counterweight 55 is burned and loses its magnetism, the counterweight 55 moves downward and also drives the connecting rod 53 to move downward. The connecting rod 53 moves downward and drives the C-shaped connecting rod 54 to move downward. When the C-shaped connecting rod 54 moves downward and presses the button 31, the alarm 3 is activated for a secondary alarm. At this time, the protective cover 7 closes the temperature detector 6, and the temperature detection of the temperature detector 6 is affected. The secondary alarm of the alarm 3 can remind relevant personnel that the fire has spread to the installation position of the temperature detector 6, thereby issuing an early warning, so that relevant personnel can formulate appropriate fire extinguishing plans in time according to the fire situation.

[0046] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A temperature detection and early warning device for fire, comprising a protective housing (1) and a temperature detector (6), characterized in that: The protective housing (1) is provided with a protective mechanism for protecting the temperature detector (6) in case of fire, and the protective housing (1) is provided with an early warning device for facilitating the temperature detector (6) to give an early warning; The protective mechanism comprises an inner panel (2), a circular shaft (4), a rack (5) and a protective cover (7); the early warning device comprises an alarm (3) and a C-shaped connecting rod (54); a mounting groove (14) is provided at the lower end of the protective shell (1); the inner panel (2) is fixedly mounted on the inner side wall of the mounting groove (14); the temperature detector (6) is located in the protective shell (1); the number of the circular shafts (4) is two, and the two circular shafts (4) are both rotatably mounted on the side ends of the inner panel (2); the number of the racks (5) is two, and the lower ends of the two racks (5) are both fixedly mounted with a vertical pole (51); the side ends of the inner panel (2) are fixedly mounted with a mounting rod (21); two hanging pipes (23) are fixedly mounted between the temperature detector (6) and the mounting rod (21); and the alarm (3) is fixedly mounted on the inner side wall of the inner panel (2); Two T-shaped slots (24) are provided at the side ends of the inner panel (2), a C-shaped side rod (25) is fixedly installed at the side ends of the inner panel (2), two magnetic blocks (26) are fixedly installed at the lower ends of the C-shaped side rod (25), rectangular slots (28) are penetrated at both side ends of the inner panel (2), gears (41) are fixedly installed at the circumferential ends of the two circular shafts (4), and the two racks (5) are respectively meshed with the two gears (41); The side ends of the two vertical rods (51) are fixedly mounted with T-shaped sliders (52), and the two T-shaped sliders (52) are respectively slidably mounted on the inner side walls of the T-shaped slide grooves (24). The side ends of the two vertical rods (51) are fixedly mounted with counterweights (55), and the counterweights (55) are made of iron. The side ends of the two vertical rods (51) are fixedly mounted with connecting rods (53), and the same C-shaped connecting rod (54) is fixedly mounted between the two connecting rods (53), and the C-shaped connecting rod (54) is slidably mounted on the inner side walls of the two rectangular grooves (28). The number of the protective covers (7) is two, and the side ends of the two protective covers (7) are penetrated with cylindrical grooves (72). The two protective covers (7) are fixedly mounted on the circumferential ends of the circular shaft (4) through the cylindrical grooves (72), and the side ends of the two protective covers (7) are also penetrated with avoidance grooves (71).

2. A temperature detection and early warning device for fire according to claim 1, characterized in that: A partition plate (11) is fixedly mounted on the inner side wall of the protective shell (1), an electrical component (13) is fixedly mounted on the upper end of the partition plate (11), and two first circular grooves (12) are also formed through the upper end of the partition plate (11); Wherein, the electrical component (13) is integrated with a circuit board, a power supply device, a signal processing device, and an alarm system.

3. A temperature detection and early warning device for fire according to claim 2, characterized in that: Two second circular grooves (22) are formed through the upper end of the mounting rod (21).

4. A temperature detection and early warning device for fire according to claim 3, characterized in that: A button (31) is provided at the upper end of the alarm (3).

5. A temperature detection and early warning device for fire according to claim 4, characterized in that: Two connecting wires (61) are electrically connected between the temperature detector (6) and the electrical element (13), and both of the connecting wires (61) pass through the inner wall of the hanging pipe (23).

6. A method for using a temperature detection and early warning device for fire, the method using the temperature detection and early warning device for fire as claimed in claim 1, characterized in that: The steps to use are as follows: S1: The ambient temperature is detected by a temperature detector (6). When it is detected that the temperature rises too fast, a signal is fed back to the electrical component (13), thereby triggering an alarm; S2: When the fire is large, the flame will burn the counterweight (55). When the temperature of the counterweight (55) exceeds the Curie point of the counterweight (55), the counterweight (55) will lose its magnetism. S3: The counterweight (55) loses its magnetism and moves downward, which drives the two protective covers (7) to rotate and seal the temperature detector (6), thereby protecting the temperature detector (6); S4: When the C-shaped connecting rod (54) moves downward, it presses the button (31) on the alarm (3), thereby triggering the alarm (3) to sound a secondary alarm.

Images