Fireproof valve with closed self-locking function

Abstract

The invention discloses a fireproof valve with a closed self-locking function, and belongs to the technical field of valve fireproof mechanisms, the fireproof valve comprises a pipeline, a valve body mounted on a handle is arranged at the joint of the pipeline, an inner pipe is fixedly mounted on one side, close to the valve body, of the inner wall of the pipeline, and flow guide grooves penetrating through the inner pipe are formed in the periphery of the inner pipe; the self-locking fireproof mechanism comprises a driving motor which is arranged at the top end of the inner wall of the valve body and connected with the handle, an output shaft of the driving motor sequentially extends to the fire extinguishing assembly and a first bevel gear, and the two ends of the first bevel gear are in engaged transmission with second bevel gears fixed to the driving wheel. And the driving wheel and the driven wheel are in transmission connection through a conveying belt. The technical problems that a fireproof valve is poor in intelligence, the valve body cannot be selectively closed according to the environment temperature and the lasting time, and the safety of the fireproof valve is reduced can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of valve fire prevention mechanisms, and in particular relates to a fire prevention damper with a closed and self-locking function. Background Art

[0002] The fire damper is a temperature-controlled memory molten alloy, which uses gravity and a spring mechanism to close the valve. Its function is: when the smoke temperature reaches 280°C, people have basically been evacuated, smoke exhaust is no longer practical, and the smoke is already carrying fire at this time, so the valve automatically closes to prevent the fire from spreading. Fire dampers can be divided into multiple structures according to their functions: smoke exhaust valves, smoke exhaust fire dampers, fire control valves, smoke and fire control valves, etc.

[0003] The fire damper is a normally open valve, which is opened by the control center with 24V DC or manually, and automatically closes at 280℃. It must be reset manually. Its function is: when the smoke temperature reaches 280℃, people have basically evacuated, smoke exhaust is meaningless, and the smoke is already carrying fire, the valve automatically closes to prevent the fire from spreading. The system's smoke exhaust vents can also use normally closed fire exhaust vents.

[0004] When building equipment encounters a fire, the fire damper is an important safety protection mechanism. In actual situations, fire dampers are also installed at pipe joints. When encountering a fire, the fire damper needs to be at a corresponding temperature so that the material on the valve can automatically melt and start the closing function. However, the intelligence is poor and the valve body cannot be selectively closed according to the ambient temperature and duration. Moreover, the valve closure is generally just a single closing of the valve without other auxiliary fire extinguishing components, which reduces the safety of the fire damper itself and also affects people's life safety. Summary of the invention

[0005] The purpose of the present invention is to provide a fire damper with a closed and self-locking function to solve the technical problems of poor intelligence, inability to selectively close the valve body according to the ambient temperature and duration, and the valve closing generally only involves closing the valve without other auxiliary fire extinguishing components, which reduces the safety of the fire damper itself.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A fire damper with closed self-locking function, comprising: A pipeline, wherein a valve body mounted on a handle is provided at the pipeline connection, and an inner pipe is fixedly installed on one side of the inner wall of the pipeline close to the valve body, and guide grooves penetrating the inner pipe are provided around the inner pipe; A self-locking fire prevention mechanism, the self-locking fire prevention mechanism includes a driving motor placed at the top of the inner wall of the valve body and connected to the handle, the output shaft of the driving motor extends to the fire extinguishing assembly and the first bevel gear in sequence, both ends of the first bevel gear are meshed with a second bevel gear fixed to the driving wheel, the driving wheel and the driven wheel are connected by a conveyor belt transmission, and one end of the driven wheel is fixed to the turntable, the turntable is integrally formed with a fixed block, and the fixed block and the retaining ring are connected by a swing rod; Both sides of the swing rod are installed on the fixed block and the retaining ring by means of a rotating connection. The retaining ring is connected with a strip groove along the length direction of the fixed disk, and a positioning hole is opened at the connection between the fixed disk and the inner tube and is connected by locking and fixing with a positioning pin. The outer wall edge of the central protrusion of the turntable is provided with a rotating groove placed on the fixed disk. As the driving motor is started, the retaining ring and the guide groove are closed to each other.

[0007] Furthermore, the fire extinguishing assembly includes a central rotating tooth fixed on the output shaft of the driving motor, both ends of the central rotating tooth are engaged with a gear plate that moves in the opposite direction, an extension of one end of the gear plate is connected to a pushing block placed on the side wall of the pipe, a box body matching it is installed on the top of the pushing block, and the box body is filled with dry yellow sand.

[0008] Furthermore, the transmission ratio of the center gear and the gear plates at both ends remains the same, and the center gear and the outside of the gear plate are placed in a cover on the inner wall of the pipe. The box body is detachably installed on the top of the valve body. When the driving motor is started, the push block and the opening of the box body are opened to each other.

[0009] Furthermore, both ends of the outer wall of the cover are provided with movable openings connected to the gear plate, and sealing gaskets placed on the cover body are adhesively installed at the movable openings, and the sealing gaskets are arranged in a ring shape or a rectangular shape.

[0010] Furthermore, it also includes a processor placed on the pipeline, the processor input end is provided with a temperature timing sensor circuit connected to a constant current source drive, the processor output end is electrically connected to a display and a drive motor respectively, and the processor, display and drive motor are all electrically connected to a power supply.

[0011] Furthermore, the temperature timing sensing circuit includes an operational amplifier IC connected to a power supply voltage VCC, the input end of the operational amplifier IC is connected in parallel with a first resistor R1 for grounding protection and a second resistor R2 connected in series, a normally closed contact of a time relay KT and a diode D connected in reverse bias, the output end of the operational amplifier is connected to the base of a composite transistor Q through a third resistor R3 and a coil of a time relay KT connected in parallel, the collector of the composite transistor Q is connected to the second resistor R2 and the operational amplifier IC connected in parallel, and the emitter of the composite transistor Q is connected to the signal output end of the processor.

[0012] Furthermore, a first capacitor C1 and a second capacitor C2 for grounding protection are electrically connected between the positive and negative ends of the power supply voltage VCC and the operational amplifier IC, respectively.

[0013] Furthermore, the diode D is a voltage regulator diode.

[0014] Furthermore, the first bevel gear, the second bevel gear, the driving wheel and the driven wheel are all placed outside in a shell, the inner wall of the shell is formed with a movable cavity, one end of the driving wheel and the driven wheel is provided with bearings placed on the inner wall of the shell, and a flow area connected to the guide groove is formed between the shell and the side wall of the pipeline.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: (1) The present invention is provided with a driving motor and a valve on the valve body, and the valve can be automatically closed by combining automatic control adjustment and manual adjustment, thereby preventing the control electrical components from being damaged and unable to be used in the event of a fire, thereby greatly increasing the safety of the fire damper.

[0016] (2) A self-locking fire prevention mechanism is provided. When a fire occurs, the driving motor is started to drive the first bevel gear to rotate. Under the action of the gear meshing transmission and the transmission action of the conveyor belt, the turntables at both ends can be rotated. Then, the swing rod is connected by a rotating connection setting, so that the retaining rings around can block the guide groove to prevent the spread of smoke. The guide grooves at both ends are closed at the same time, which can play a double protection role. In addition, the entire transmission component works stably, effectively self-locks and closes the pipe mouth, and has strong control performance.

[0017] (3) A fire extinguishing assembly is provided. The fire extinguishing assembly is used in conjunction with a self-locking fire protection mechanism. When the driving motor is started, the central rotating gear can rotate, thereby driving the movement of the push block through the gear plates at both ends. During the movement of the push block, the opening on the box body can be opened and dry yellow sand can be distributed in the pipe, thereby playing a closing role. At the same time, the particle structure of the dry yellow sand can effectively isolate the air, further reducing the fire and reducing the fire situation.

[0018] (4) Set up a thermometer sensing circuit. The thermometer sensing circuit mainly measures the temperature inside the pipeline and the duration data under high temperature. Only when the temperature is high and maintained for a period of time, will the signal be transmitted to the processor and the drive motor will be controlled to start to perform corresponding fire prevention work. If the temperature is high but the duration is short, it may be that the heat inside the pipeline has not dissipated in time, so the processor will not control the drive motor to start. Therefore, the thermometer sensing circuit combines the temperature inside the pipeline and the circuit detection time to collect data. It has a high degree of intelligence and can control the fire in the pipeline in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of a fire damper with a closed self-locking function according to the present invention; Figure 2 It is a front view of a fire damper with a closed and self-locking function according to the present invention; Figure 3 is a schematic diagram of the interior of the pipeline of the present invention; Figure 4 It is a structural schematic diagram of the self-locking fire protection mechanism of the present invention; Figure 5 It is a schematic diagram of the connection between the rotating disk and the fixed disk of the present invention; Figure 6 It is a schematic diagram of the meshing transmission of the center rotating gear of the present invention; Figure 7 is a structural block diagram of the processor of the present invention; Figure 8 It is the principle diagram of the temperature measuring sensor circuit of the present invention.

[0021] Figure numerals: 1. pipeline; 2. handle; 3. valve body; 4. inner tube; 5. guide groove; 6. self-locking fire protection mechanism; 7. driving motor; 8. fire extinguishing assembly; 9. first bevel gear; 10. driving wheel; 11. second bevel gear; 12. driven wheel; 13. conveyor belt; 14. turntable; 15. fixed block; 16. retaining ring; 17. swing rod; 18. fixed disk; 19. center rotating tooth; 20. gear plate; 21. pushing block; 22. box body; 23. processor; 24. constant current source; 25. temperature timing sensor circuit; 26. display; 27. power supply. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Reference Manual Attached Figure 1 and Figure 2 As shown, a fire damper with a closed self-locking function comprises: A pipe 1, a valve body 3 mounted on a handle 2 is provided at the connection of the pipe 1, and an inner pipe 4 is fixedly installed on one side of the inner wall of the pipe 1 close to the valve body 3, and a guide groove 5 penetrating the inner wall of the inner pipe 4 is provided around the inner pipe 4; The self-locking fire protection mechanism 6 includes a driving motor 7 placed on the top of the inner wall of the valve body 3 and connected to the handle 2. The output shaft of the driving motor 7 extends to the fire extinguishing assembly 8 and the first bevel gear 9 in sequence. Both ends of the first bevel gear 9 are meshed with a second bevel gear 11 fixed on the driving wheel 10. The driving wheel 10 and the driven wheel 12 are connected by a conveyor belt 13, and one end of the driven wheel 12 is fixed on the turntable 14 at the center. The turntable 14 is integrally formed with a fixed block 15 around it, and the fixed block 15 and the retaining ring 16 are connected by a swing rod 17.

[0024] The present invention is provided with a driving motor 7 and a valve on the valve body 3. Through a combination of automatic control adjustment and manual adjustment, the valve can be automatically closed to prevent the situation where the control electrical components are damaged and cannot be used when encountering a fire, thereby greatly increasing the safety of the fire damper. In the present invention, the retaining ring 16 on the fixed plate 18 cooperates with the inner tube 4 to act as a valve.

[0025] Specifically, corresponding mounting flanges and corresponding bolt assemblies are also provided at the connection of the pipeline 1, so that the installation and fixation between the pipelines 1 can be facilitated. For the above-mentioned mounting flanges and bolt assemblies, since they are conventional technical means for technical personnel in this field, the present invention will not describe them in detail here, and therefore will not affect the effective implementation of the technical solution of the present invention.

[0026] refer to Figure 3 , Figure 4 , Figure 5 and Figure 6Both sides of the swing rod 17 are installed on the fixed block 15 and the retaining ring 16 by means of rotational connection. The retaining ring 16 is connected with a strip groove along the length direction of the fixed disk 18, and a positioning hole is opened at the connection between the fixed disk 18 and the inner tube 4 and is connected by locking and fixing with a positioning pin. The outer wall edge of the central protrusion of the rotating disk 14 is provided with a rotating groove placed on the fixed disk 18. As the driving motor 7 is started, the retaining ring 16 and the guide groove 5 are opened or closed with each other.

[0027] Specifically, the guide groove 5 on the inner tube 4 is not only conducive to providing a movable space for the fluid to pass through, but also can serve as a connecting medium between the fixed plate 18 and the pipeline 1. After the drive motor 7 is started, it can simultaneously drive the fire extinguishing component 8 and the self-locking fire protection mechanism 6 to work. The self-locking fire protection mechanism 6 converts the output power of the drive motor 7 into the rotation of the driven wheel 12, and the meshing transmission of the first bevel gear 9 and the second bevel gear 11 mainly adjusts the power in reverse direction and converts the vertical rotational force into the horizontal rotational force, thereby driving the rotation of the turntable 14 through the driven wheel 12, and then with the help of the rotation connection of the swing rod 17, the retaining ring 16 can be moved horizontally in the strip groove, and then the notch on the guide groove 5 is closed to prevent the fire from spreading.

[0028] The fire extinguishing assembly 8 mainly opens the opening at the box body 22 by the reverse movement of the gear plate 20, so that the dry yellow sand can automatically slide into the inside of the pipeline 1 due to its own gravity, playing a corresponding barrier and protection role. The dry yellow sand is a non-conductive material, so it will not cause the current to flow further, thereby preventing the spread of fire. In addition, the particle structure of the dry yellow sand can effectively isolate the air and further reduce the fire. In electrical fires, the use of dry yellow sand can quickly and safely extinguish the fire source and reduce the losses caused by the fire.

[0029] A fire extinguishing assembly 8 is provided, and the fire extinguishing assembly 8 is used in conjunction with the self-locking fire protection mechanism 6. When the driving motor 7 is started, the central rotating tooth 19 can be rotated, thereby driving the movement of the pushing block 21 through the gear plates 20 at both ends. During the movement of the pushing block 21, the opening on the box body 22 can be opened and dry yellow sand can be distributed in the pipeline 1, thereby playing a closing role. At the same time, the particle structure of the dry yellow sand can effectively isolate the air, further reduce the fire, and reduce the fire situation.

[0030] In addition, dry sand can also be replaced by dry powder. The volatile decomposition products of inorganic salts in the dry powder have chemical inhibition and secondary catalytic effects on the free radicals or active groups produced by the fuel during the combustion process, interrupting the chain reaction of combustion and extinguishing the fire. In addition, the powder of the dry powder falls on the surface of the combustible material, undergoes a chemical reaction, and forms a glass-like covering layer under the action of high temperature, isolating oxygen and suffocating the fire. At the same time, the dry powder fire extinguishing agent also has the function of cooling and diluting the oxygen in the air of the combustion area.

[0031] A self-locking fire prevention mechanism 6 is provided. When a fire occurs, after the driving motor 7 is started, it can drive the rotation of the first bevel gear 9. Under the action of the gear meshing transmission, the transmission action of the conveyor belt 13 is cooperated, so that the turntables 14 at both ends can be rotated. Then, the rotating connection setting of the swing rod 17 is utilized to allow the retaining rings 16 around to block the guide groove 5 to prevent the spread of smoke, and the guide grooves 5 at both ends are closed at the same time, which can play a role of double protection. Moreover, the entire transmission component works stably, effectively self-locks and closes the pipe mouth, and has strong control performance.

[0032] The fire extinguishing assembly 8 includes a central rotating tooth 19 fixed on the output shaft of the driving motor 7, both ends of the central rotating tooth 19 are meshed with a gear plate 20 that moves in the opposite direction, and the extension of one end of the gear plate 20 is connected to a push block 21 placed on the side wall of the pipe 1, and a box body 22 adapted to it is installed on the top of the push block 21, and the box body 22 is filled with dry yellow sand. The transmission ratio of the central rotating tooth 19 and the gear plate 20 at both ends is kept the same, and the outside of the central rotating tooth 19 and the gear plate 20 are both placed in a cover on the inner wall of the pipe 1, and the box body 22 is detachably installed on the top of the valve body 3. As the driving motor 7 starts The push block 21 and the opening of the box body 22 are opened or closed to each other, and both ends of the outer wall of the cover are provided with movable openings connected to the gear plate 20, and the movable openings are adhesively installed with sealing gaskets placed on the cover body. The above-mentioned transmission ratio remains the same. The main purpose is to synchronously drive the movement of the push block 21. The push block 21 essentially plays a role of shielding and closing. The top of the push block 21 seals the dry yellow sand. Once a fire occurs, the push blocks 21 at both ends can be moved by the transmission mechanism, and the opening can be opened, so that the dry yellow sand can be directly poured out for fire prevention.

[0033] The first bevel gear 9, the second bevel gear 11, the driving wheel 10 and the driven wheel 12 are all placed outside in the shell, and a movable cavity is formed on the inner wall of the shell. One end of the driving wheel 10 and the driven wheel 12 is provided with bearings placed on the inner wall of the shell, and a flow area connected to the guide groove 5 is formed between the shell and the side wall of the pipeline 1.

[0034] The bearings on the housing can not only provide support for the driving wheel 10 and the driven wheel 12, but also ensure their free rotation. Moreover, the balls in the bearings rotate by rolling friction, which effectively reduces friction damage and increases the service life of the structural parts.

[0035] The settings of the shell and the cover body play a corresponding protective role for the corresponding self-locking fire protection mechanism 6 and the outer wall of the fire extinguishing component 8, preventing particulate impurities in the smoke and dust from entering the interior of the fire damper, thereby affecting the normal movement of the transmission parts. In addition, sealing gaskets are provided at the connections between the shell and the cover body and the structural parts, which can ensure the sealing inside the transmission parts and provide normal movement space for the transmission parts.

[0036] Reference Figure 7 and attached Figure 8 A fire damper with a closed and self-locking function also includes a processor 23 placed on a pipe 1, an input end of the processor 23 is provided with a temperature timing sensor circuit 25 driven and connected to a constant current source 24, an output end of the processor 23 is electrically connected to a display 26 and a drive motor 7, and the processor 23, the display 26 and the drive motor 7 are all electrically connected to a power supply 27.

[0037] The temperature timing sensing circuit 25 includes an operational amplifier IC connected to a power supply voltage VCC, an input end of the operational amplifier IC is connected in parallel with a first resistor R1 for grounding protection and a second resistor R2 connected in series, a normally closed contact of a time relay KT and a diode D connected in reverse bias, an output end of the operational amplifier is connected to the base of a composite transistor Q through a third resistor R3 and a coil of the time relay KT connected in parallel, a collector of the composite transistor Q is connected to the second resistor R2 and the operational amplifier IC connected in parallel, and an emitter of the composite transistor Q is connected to the signal output end of the processor.

[0038] A first capacitor C1 and a second capacitor C2 for ground protection are electrically connected between the positive and negative ends of the power supply voltage VCC and the operational amplifier IC, and the diode D is a voltage-stabilizing diode.

[0039] Specifically, the constant current source 24 drives the temperature time sensing circuit 25 to convert the resistance signal into a voltage signal. According to the relationship between the sampled voltage and the resistance, an accurate temperature measurement value is finally obtained through the processor, and the corresponding digital value is sent to the display for display.

[0040] Diode D is a voltage stabilizing diode. According to the short-circuit principle of the operational amplifier IC, the voltage at the in-phase terminal of the operational amplifier IC is equal to the voltage at the inverting terminal, which can avoid the influence of the heat generated by the excitation current. According to the principle of virtual disconnection of the operational amplifier IC, it can be seen that the current flowing through the second resistor R2 almost all flows into the composite transistor Q, and does not flow into the other end of the operational amplifier IC. The output current of the collector of the composite transistor Q flows to the signal output end, thereby realizing the design of a high-precision constant current source.

[0041] In addition, the second resistor R2 is a precision wire-wound resistor with good stability; the composite transistor Q composed of two 9012 transistors increases the current amplification factor value, reduces the temperature drift coefficient, and stabilizes the constant current value.

[0042] The reverse biased diode D can not only realize sensitive measurement of temperature through the temperature dependence of its volt-ampere characteristic, but also use its high reverse resistance and ability to withstand a certain reverse voltage to ensure that the circuit will not be damaged by excessive current under abnormal circumstances.

[0043] A time relay KT consisting of a time relay KT coil and a time relay KT normally closed contact is added to the circuit, which can measure the normal operation time of the circuit and the operation time of the circuit when the temperature is too high, so that the temperature signal data can be fed back to the processor 23, so as to make an accurate judgment on the operating status inside the fire damper, thereby preventing misjudgment. Moreover, when the high-temperature circuit runs for too long, it can automatically trigger the KT normally closed contact to disconnect, so that the entire circuit is in a disconnected state, preventing electrical components from short-circuiting during a fire, and further improving the safety of the use of fire dampers.

[0044] Compared with the single diode in the circuit, the present invention uses a composite transistor Q, whose working principle is based on that each transistor works in the amplification region, and through the correct external voltage, the entire circuit can receive signals with a higher input resistance and convert the current signal into an output voltage signal. In addition, the composite transistor Q also has a higher input resistance and output resistance, which means that it requires a higher input signal to work, and an additional load circuit is required at the output end to reduce the output impedance, thereby achieving high amplification and high-efficiency control.

[0045] A thermometer sensing circuit 25 is provided, and the thermometer sensing circuit 25 is mainly used to measure the temperature in the pipeline 1 and the duration data under high temperature. Only when the temperature is high and maintained for a period of time, the signal will be transmitted to the processor and the drive motor will be controlled to start to perform corresponding fire prevention work. If the temperature is high but the duration is short, it may be that the heat inside the pipeline 1 has not been dissipated in time, so that the processor will not control the drive motor to start. Therefore, the thermometer sensing circuit combines the temperature in the pipeline 1 with the circuit detection time to collect data, and has a high degree of intelligence, and can control the fire in the pipeline 1 in time.

[0046] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0047] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A fire damper with closed self-locking function, It is characterized in that include: A pipeline (1), wherein a valve body (3) mounted on a handle (2) is provided at the connection of the pipeline (1), and an inner pipe (4) is fixedly mounted on one side of the inner wall of the pipeline (1) close to the valve body (3), and guide grooves (5) are provided around the inner pipe (4) and penetrate the inner wall; A self-locking fire prevention mechanism (6), the self-locking fire prevention mechanism (6) comprising a driving motor (7) disposed at the top end of the inner wall of the valve body (3) and connected to the handle (2), the output shaft of the driving motor (7) extending to the fire extinguishing assembly (8) and the first bevel gear (9) in sequence, both ends of the first bevel gear (9) being meshed with a second bevel gear (11) fixed to the driving wheel (10), the driving wheel (10) and the driven wheel (12) being connected to each other through a conveyor belt (13), and one end of the driven wheel (12) at the center is fixed to a rotating disk (14), the rotating disk (14) is integrally formed with a fixing block (15) around it, and the fixing block (15) and the retaining ring (16) are connected through a swing rod (17); Both sides of the swing rod (17) are mounted on the fixed block (15) and the retaining ring (16) by means of a rotational connection; the retaining ring (16) is connected with a strip groove along the length direction of the fixed disk (18); a positioning hole is provided at the connection between the fixed disk (18) and the inner tube (4) and the fixed disk (18) and the inner tube (4) are connected by means of a locking and fixing method using a positioning pin; the outer wall edge of the central protruding portion of the rotating disk (14) is provided with a rotation groove disposed on the fixed disk (18); when the driving motor (7) is started, the retaining ring (16) and the guide groove (5) are closed to each other.

2. A fire damper with closed self-locking function according to claim 1, It is characterized in that The fire extinguishing assembly (8) comprises a central rotating tooth (19) fixed on the output shaft of the driving motor (7), both ends of the central rotating tooth (19) are meshed with a gear plate (20) that moves in the opposite direction, an extension of one end of the gear plate (20) is connected to a push block (21) disposed on the side wall of the pipe (1), a box body (22) adapted thereto is installed on the top of the push block (21), and the box body (22) is filled with dry yellow sand.

3. A fire damper with closed self-locking function according to claim 2, It is characterized in that The transmission ratios of the central rotating tooth (19) and the gear plates (20) at both ends are kept the same, and the outsides of the central rotating tooth (19) and the gear plates (20) are both placed in a cover on the inner wall of the pipe (1). The box body (22) is detachably mounted on the top of the valve body (3). When the driving motor (7) is started, the push block (21) and the opening of the box body (22) are opened to each other.

4. A fire damper with closed self-locking function according to claim 3, It is characterized in that Both ends of the outer wall of the cover are provided with movable openings connected to the gear plate (20), and sealing pads placed on the cover body are adhesively mounted at the movable openings, and the sealing pads are arranged in a ring shape or a rectangular shape.

5. A fire damper with closed self-locking function according to claim 1, It is characterized in that It also includes a processor (23) disposed on the pipeline (1), wherein an input end of the processor (23) is provided with a temperature timing sensor circuit (25) connected to a constant current source (24) for driving, and an output end of the processor (23) is electrically connected to a display (26) and a drive motor (7), respectively, and the processor (23), the display (26) and the drive motor (7) are all electrically connected to a power supply (27).

6. A fire damper with closed self-locking function according to claim 5, It is characterized in that The temperature timing sensing circuit (25) comprises an operational amplifier IC connected to a power supply voltage VCC, the operational amplifier IC input end is connected in parallel with a first resistor R1 for ground protection and a second resistor R2 connected in series, a normally closed contact of a time relay KT and a diode D connected in reverse bias, the operational amplifier output end is connected to the base of a composite transistor Q through a third resistor R3 and a coil of the time relay KT connected in parallel, the collector of the composite transistor Q is connected to the second resistor R2 and the operational amplifier IC connected in parallel, and the emitter of the composite transistor Q is connected to the signal output end of the processor.

7. A fire damper with closed self-locking function according to claim 6, It is characterized in that A first capacitor C1 and a second capacitor C2 for grounding protection are electrically connected between the positive and negative ends of the power supply voltage VCC and the operational amplifier IC, respectively.

8. A fire damper with closed self-locking function according to claim 6, It is characterized in that The diode D is a voltage stabilizing diode.

9. A fire damper with closed self-locking function according to claim 1, It is characterized in that The first bevel gear (9), the second bevel gear (11), the driving wheel (10) and the driven wheel (12) are all externally disposed in a housing, an inner wall of the housing forms a movable cavity, one end of the driving wheel (10) and the driven wheel (12) are provided with bearings disposed on the inner wall of the housing, and a flow area connected to the guide groove (5) is formed between the housing and the side wall of the pipeline (1).

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