Intelligent lightning protection system of fire extinguisher

Abstract

The utility model discloses an intelligent lightning protection system of a fire extinguisher, which relates to a lightning protection system and comprises a metal mounting box, a lightning protection host and a delayer, the lightning protection host comprises a shell and a lightning protection circuit fixed in the shell; the metal installation box is grounded, the lightning protection host is installed in the metal installation box through the elastic contact connecting device, and the grounding end of the lightning protection circuit is connected with the inner wall of the metal installation box through the elastic contact connecting device. According to the utility model, the lightning protection function of the fire extinguisher starting circuit is realized, and the lightning protection function is more comprehensive and reliable.

Description

Technical Field

[0001] The utility model relates to a lightning protection system, and more specifically, to an intelligent lightning protection system for a fire extinguisher. Background Art

[0002] In tobacco sorting enterprises, the cigarette storage warehouse is equipped with fire extinguishers because the cigarette storage warehouse has a large amount of cigarettes and they are all flammable. In order to ensure that the fire can be extinguished at one time after the fire occurs and avoid the spread of the fire, these fire extinguishers adopt a one-time comprehensive spraying method. Its main working process is: when the fire extinguishing control panel sends a fire alarm signal, the fire alarm signal will be sent to the fire extinguishing starting device, and the fire extinguishing starting device will generate a control signal and send it to the electromagnetic drive device of the fire extinguisher to open the injection channel of the fire extinguisher, so that the fire extinguisher can spray the fire extinguishing medium to extinguish the fire. Although this can extinguish the fire well when a fire occurs, corresponding defects have also been found during use. For example, there have been cases where fire extinguishers were sprayed by mistake in thunderstorms. After investigation and analysis of the accident, it was found that the main reason was the fire extinguishing starting device. When a strong lightning strike occurs near the cigarette storage warehouse, the electromagnetic interference of lightning may cause electromagnetic coupling in the starting circuit of the fire extinguishing starting device, and voltage and current are induced in the starting circuit. Although these induced voltages and currents are somewhat different from the voltages and currents of normal control signals, there is also a risk that the electromagnetic drive device may be activated, causing the fire extinguisher to be triggered by mistake. Once the fire extinguisher is triggered, it will need to be replaced as a whole, which will bring great losses to the company. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an intelligent lightning protection system for a fire extinguisher in view of the deficiencies of the prior art, thereby realizing the lightning protection function of a starting circuit of the fire extinguisher.

[0004] The utility model discloses an intelligent lightning protection system for a fire extinguisher, comprising a metal installation box, a lightning protection host and a timer; the lightning protection host comprises a shell and a lightning protection circuit fixed in the shell; the metal installation box is grounded, the lightning protection host is installed in the metal installation box through a spring-type contact connection device, and the grounding end of the lightning protection circuit is connected to the inner wall of the metal installation box through the spring-type contact connection device;

[0005] The lightning protection circuit is provided with a processing unit, a comparison unit and a relay; the output end of the fire extinguishing starting device is electrically connected to the input end of the comparison unit, the output end of the comparison unit is electrically connected to the input end of the processing unit, the output end of the processing unit is electrically connected to the coil control circuit of the relay, the output end of the fire extinguishing starting device is also electrically connected to the normally open contact of the relay, and the common contact of the relay is electrically connected to the input end of the electromagnetic drive device through a delay device.

[0006] As a further improvement, the comparison unit includes a comparator, a sixth resistor, a seventh resistor, an eighth resistor, an eleventh resistor, a twelfth resistor, an eighth voltage-stabilizing diode and a thirty-fifth resistor; one end of the eighth resistor is electrically connected to the output end of the fire extinguishing starting device, the other end of the eighth resistor is electrically connected to the eleventh resistor, the eighth voltage-stabilizing diode and the reverse input end of the comparator, and the other ends of the eleventh resistor and the eighth voltage-stabilizing diode are grounded; one end of the sixth resistor is electrically connected to the power supply end, the other end of the sixth resistor is electrically connected to the twelfth resistor and the positive input end of the comparator, and the other end of the twelfth resistor is grounded; the output end of the comparator is electrically connected to the seventh resistor and the thirty-fifth resistor at the same time, the other end of the seventh resistor is electrically connected to the connection end of the sixth resistor and the positive input end of the comparator, and the other end of the thirty-fifth resistor is connected to the input end of the processing unit.

[0007] As a further improvement, the coil control circuit includes a transistor, a ninth diode, and a fourteenth resistor; the output end of the processing unit is electrically connected to the gate of the transistor through a seventeenth resistor, the source of the transistor is grounded, the drain of the transistor is simultaneously connected to one end of the relay coil and the anode of the ninth diode through a sixteenth resistor, the cathode of the ninth diode is simultaneously electrically connected to the other end of the relay coil, the power supply end, and one end of the fourteenth resistor, and the other end of the fourteenth resistor is connected to an indicator light and the connection end of the sixteenth resistor and the transistor drain.

[0008] As a further improvement, the processing unit is electrically connected to a wireless communication unit.

[0009] Furthermore, a via hole is provided on the metal installation box, and an antenna electrically connected to the wireless communication unit is installed in the via hole.

[0010] As a further improvement, the spring-type contact connecting device includes a U-shaped metal sheet, a positioning cylinder and a rotating rod rotatably installed in the positioning cylinder; one end of the U-shaped metal sheet is welded to the grounding contact of the lightning protection circuit, and a slide groove is provided in the outer shell, and the other end of the U-shaped metal sheet is inserted in the slide groove and is slidably connected to the inner wall of the slide groove; through holes are provided at the four end corners of the outer shell, and the positioning cylinder is inserted in the through holes, and the rotating rod extends to the top of the positioning cylinder, and a spring with one end fixedly connected to the positioning cylinder is installed above the positioning cylinder, and the spring is sleeved on the rotating rod, and a limit plate is fixedly provided above the rotating rod, and a through groove matching the limit plate is provided on one side of the through hole, and a limit ring is provided at the upper end of the through hole.

[0011] Beneficial Effects

[0012] The advantages of the utility model are: the lightning protection circuit composed of a comparison unit, a processing unit and a relay processes the output electrical signal of the fire extinguishing start device, thereby realizing the lightning protection function of the fire extinguisher start circuit. In addition, the utility model also ensures the normal operation of the lightning protection host through hardware lightning protection measures constructed by components such as a metal installation box and a spring-type contact connection device, so that the intelligent lightning protection system can realize a more comprehensive lightning protection function. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the internal installation structure of the metal installation box of the utility model;

[0014] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0015] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure at BB in the middle;

[0016] Figure 4 This is a schematic diagram of the circuit connection of the intelligent lightning protection system of the utility model;

[0017] Figure 5 It is a partial schematic diagram of the AIR780 chip in the processing unit of the utility model;

[0018] Figure 6 This is a schematic diagram of the circuit structure of the comparison unit of the utility model;

[0019] Figure 7 This is a schematic diagram of a relay and a control circuit of the utility model. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the embodiments, but does not constitute any limitation to the utility model. Any limited modifications made by anyone within the scope of the claims of the utility model are still within the scope of the claims of the utility model.

[0021] See also Figure 1-Figure 7The utility model discloses an intelligent lightning protection system for a fire extinguisher, comprising a metal installation box 5, a lightning protection host 2 and a timer 3. The lightning protection host 2 comprises a shell 20 and a lightning protection circuit 21 fixed in the shell 20. The shell 20 is a plastic shell. The metal installation box 5 is grounded, and the lightning protection host 2 is installed in the metal installation box 5 through a spring-type contact connection device, and the grounding end of the lightning protection circuit 21 is connected to the inner wall of the metal installation box 5 through a spring-type contact connection device. The metal installation box 5 is grounded to provide electromagnetic shielding to the lightning protection host 2 inside it from the outside, thereby greatly reducing the electromagnetic interference of the lightning protection host 2 caused by lightning and interference signals generated by other equipment, and ensuring the stable operation of the lightning protection host 2. The internal lightning protection circuit 21 of the lightning protection host 2 is installed through the shell 20, which not only provides protection for the lightning protection circuit 21, but also facilitates the installation of the lightning protection circuit 21, avoiding the need to consider the shielding and creepage distance between the lightning protection circuit 21 and the metal installation box 5 when using a metal shell. In addition, in order to ensure reliable grounding of the lightning protection circuit 21, it is connected to the metal installation box 5 through a spring-type contact connection device, thereby further reducing the possibility of being disturbed by lightning.

[0022] like Figure 4As shown, regarding the lightning protection circuit 21 of the lightning protection host 2, a processing unit 212, a comparison unit 211 and a relay K1 are provided. Among them, the processing unit 212 can adopt a main control circuit based on the AIR780 chip U1. The output end of the fire extinguishing starting device 1 is electrically connected to the input end of the comparison unit 211, the output end of the comparison unit 211 is electrically connected to the input end of the processing unit 212, the output end of the processing unit 212 is electrically connected to the coil control circuit of the relay K1, and the output end of the fire extinguishing starting device 1 is also electrically connected to the normally open contact of the relay K1, and the common contact of the relay K1 is electrically connected to the input end of the electromagnetic drive device 4 through the delay 3. The comparison unit 211 compares the electrical signal with the reference electrical signal and outputs a digital signal, that is, 0 or 1; the processing unit 212 compares the digital signal with the pre-stored digital signal, and then identifies whether the electrical signal is an abnormal signal based on the comparison result. For example, the fire extinguishing starter 1 outputs a normal start signal, and the electrical signal output by the comparison unit 211 is consistent with the electrical signal pre-stored in the processing unit 212. At this time, the processing unit 212 will output a control signal to the control circuit of the relay K1; when the start circuit of the fire extinguishing starter 1 is affected by electromagnetic interference such as lightning and an induced electrical signal appears, the electrical signal output by the comparison unit 211 is inconsistent with the electrical signal pre-stored in the processing unit 212, so that the processing unit 212 does not output a control signal to the control circuit of the relay K1, so that the induced electrical signal will not be transmitted to the electromagnetic drive device 4, thereby avoiding the false triggering of the electromagnetic drive device 4. In addition, the intelligent lightning protection system of the utility model is also provided with a redundant mechanism, such as a delay device 3. Assuming that the electrical parameters of the induced electrical signal meet the electrical parameters of the normal start signal, there is also a risk of false triggering of the electromagnetic drive device 4. However, for the induced electrical signal, its duration is generally short. Therefore, by delaying the electrical signal output by the lightning protection host 2 through the delay device 3, these induced electrical signals with a short duration can be effectively delayed and shielded, thereby preventing these abnormal starting signals from being transmitted to the electromagnetic drive device 4.

[0023] In summary, the utility model realizes the lightning protection function of the fire extinguisher starting circuit through the circuit structure of the lightning protection circuit 21, and also ensures the normal operation of the lightning protection host 2 through hardware lightning protection measures constructed by components such as the metal mounting box 5 and the spring-type contact connection device, so that the intelligent lightning protection system can achieve a more comprehensive lightning protection function.

[0024] like Figure 6As shown, regarding the comparison unit 211 in the lightning protection circuit 21, its circuit mainly includes a comparator U2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, an eleventh resistor R11, a twelfth resistor R12, an eighth voltage zener diode D8 and a thirty-fifth resistor R35. One end of the eighth resistor R8 is electrically connected to the output end of the fire extinguishing starting device 1, and the other end of the eighth resistor R8 is electrically connected to the eleventh resistor R11, the eighth voltage zener diode D8 and the reverse input end of the comparator U2 at the same time, and the other ends of the eleventh resistor R11 and the eighth voltage zener diode D8 are grounded. One end of the sixth resistor R6 is electrically connected to the power supply end VCC, and the other end of the sixth resistor R6 is electrically connected to the twelfth resistor R12 and the forward input end of the comparator U2 at the same time, and the other end of the twelfth resistor R12 is grounded, so as to realize inputting a reference electrical signal to the input end of the comparator U2. The output end of the comparator U2 is electrically connected to the seventh resistor R7 and the thirty-fifth resistor R35 at the same time, the other end of the seventh resistor R7 is electrically connected to the connection end of the sixth resistor R6 and the positive input end of the comparator U2, and the other end of the thirty-fifth resistor R35 is connected to the input end of the processing unit 212, thereby realizing the comparison between the electrical signal transmitted by the fire extinguishing starting device 1 and the reference electrical signal, and outputting the comparison result to the processing unit 212.

[0025] like Figure 7 As shown, in order to realize the control of relay K1, the coil control circuit of this embodiment includes transistor Q1, ninth diode D9, and fourteenth resistor R14. The output end of processing unit 212 is electrically connected to the gate of transistor Q1 through seventeenth resistor R17, the source of transistor Q1 is grounded, the drain of transistor Q1 is simultaneously connected to one end of the coil of relay K1 and the anode of ninth diode D9 through sixteenth resistor R16, the cathode of ninth diode D9 is simultaneously electrically connected to the other end of the coil of relay K1, power supply end VCC), and one end of fourteenth resistor R14, the other end of fourteenth resistor R14 is connected to the connecting end of sixteenth resistor R16 and drain of transistor Q1 through indicator LED. When the gate of transistor Q1 receives the control signal of processing unit 212, it will be turned on, so that the control circuit and the coil form a loop, thereby realizing the operation of relay K1.

[0026] Preferably, the processing unit 212 is electrically connected to a wireless communication unit. The wireless communication unit may be a 4G communication unit. Thus, when the processing unit 212 identifies that the electrical signal sent by the fire extinguishing activation device 1 is an abnormal activation signal, the processing unit 212 sends an alarm signal to the PC and mobile phone through the wireless communication unit for real-time alarm, so as to promptly remind the management personnel.

[0027] Since the grounding of the metal installation box 5 may shield the wireless signal of the wireless communication unit and reduce the signal strength, a via hole is provided on the metal installation box 5 of the utility model, and an antenna 6 electrically connected to the wireless communication unit is installed in the via hole to solve the signal shielding problem.

[0028] like Figure 3 As shown, for the spring-type contact connection device, its specific structure mainly includes a U-shaped metal sheet 15, a positioning cylinder 10, and a rotating rod 11 rotatably installed in the positioning cylinder 10. One end of the U-shaped metal sheet 15 is welded to the grounding contact of the lightning protection circuit 21, and a slide groove 14 is provided in the shell 20, and the other end of the U-shaped metal sheet 15 is inserted into the slide groove 14. The U-shaped metal sheet 15 protrudes from the back of the shell 20 to facilitate its contact with the metal installation box 5. Through holes 7 are provided at the four end corners of the shell 20, and the positioning cylinder 10 is inserted into the through holes 7. The rotating rod 11 extends to the top of the positioning cylinder 10. A spring 12 with one end fixedly connected to the positioning cylinder 10 is installed above the positioning cylinder 10. The spring 12 is sleeved on the rotating rod 11. A limit plate 9 is fixedly provided above the rotating rod 11. A through groove 8 matching the limit plate 9 is provided on one side of the through hole 7, and a limit ring 13 is provided at the upper end of the through hole 7. When installing the lightning protection host 2, it is only necessary to align the four through holes 7 of the outer shell 20 with the four positioning tubes 10 in the metal mounting box 5, and then press it down so that the spring 12 is compressed and the limit plate 9 is located above the outer shell 20. The rotating rod 11 can be rotated so that the limit plate 9 is misaligned with the through groove 8. The limit plate 9 can form a positioning for the lightning protection host 2, thereby completing the installation of the lightning protection host 2.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. An intelligent lightning protection system for a fire extinguisher, characterized in that: The invention comprises a metal installation box (5), a lightning protection host (2) and a time delay device (3); the lightning protection host (2) comprises a housing (20) and a lightning protection circuit (21) fixed in the housing (20); the metal installation box (5) is grounded, the lightning protection host (2) is installed in the metal installation box (5) through a spring-type contact connection device, and the grounding end of the lightning protection circuit (21) is connected to the inner wall of the metal installation box (5) through the spring-type contact connection device; The lightning protection circuit (21) is provided with a processing unit (212), a comparison unit (211) and a relay (K1); the output end of the fire extinguishing starting device (1) is electrically connected to the input end of the comparison unit (211), the output end of the comparison unit (211) is electrically connected to the input end of the processing unit (212), the output end of the processing unit (212) is electrically connected to the coil control circuit of the relay (K1), the output end of the fire extinguishing starting device (1) is also electrically connected to the normally open contact of the relay (K1), and the common contact of the relay (K1) is electrically connected to the input end of the electromagnetic drive device (4) through a time delay device (3).

2. The intelligent lightning protection system for fire extinguishers according to claim 1 is characterized in that: The comparison unit (211) comprises a comparator (U2), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8), an eleventh resistor (R11), a twelfth resistor (R12), an eighth voltage-stabilizing diode (D8) and a thirty-fifth resistor (R35); one end of the eighth resistor (R8) is electrically connected to the output end of the fire extinguishing starting device (1), the other end of the eighth resistor (R8) is electrically connected to the eleventh resistor (R11), the eighth voltage-stabilizing diode (D8) and the reverse input end of the comparator (U2), and the other ends of the eleventh resistor (R11) and the eighth voltage-stabilizing diode (D8) are electrically connected to the output end of the fire extinguishing starting device (1). grounded; one end of the sixth resistor (R6) is electrically connected to the power supply end (VCC), the other end of the sixth resistor (R6) is electrically connected to the twelfth resistor (R12) and the positive input end of the comparator (U2), and the other end of the twelfth resistor (R12) is grounded; the output end of the comparator (U2) is electrically connected to the seventh resistor (R7) and the thirty-fifth resistor (R35) at the same time, the other end of the seventh resistor (R7) is electrically connected to the connection end of the sixth resistor (R6) and the positive input end of the comparator (U2), and the other end of the thirty-fifth resistor (R35) is connected to the input end of the processing unit (212).

3. The intelligent lightning protection system for fire extinguishers according to claim 1 is characterized in that: The coil control circuit comprises a transistor (Q1), a ninth diode (D9), and a fourteenth resistor (R14); the output end of the processing unit (212) is electrically connected to the gate of the transistor (Q1) through a seventeenth resistor (R17); the source of the transistor (Q1) is grounded; the drain of the transistor (Q1) is simultaneously connected to one end of the coil of the relay (K1) and the anode of the ninth diode (D9) through a sixteenth resistor (R16); the cathode of the ninth diode (D9) is simultaneously electrically connected to the other end of the coil of the relay (K1), the power supply end (VCC), and one end of the fourteenth resistor (R14); the other end of the fourteenth resistor (R14) is connected to an indicator light (LED) and a connection end of the sixteenth resistor (R16) and the drain of the transistor (Q1).

4. The intelligent lightning protection system for fire extinguishers according to claim 1 is characterized in that: The processing unit (212) is electrically connected to a wireless communication unit.

5. The intelligent lightning protection system for fire extinguishers according to claim 4 is characterized in that: The metal installation box (5) is provided with a via hole, and an antenna (6) electrically connected to the wireless communication unit is installed in the via hole.

6. The intelligent lightning protection system for fire extinguishers according to claim 1, characterized in that: The spring-type contact connection device comprises a U-shaped metal sheet (15), a positioning tube (10) and a rotating rod (11) rotatably mounted in the positioning tube (10); one end of the U-shaped metal sheet (15) is welded to the grounding contact of the lightning protection circuit (21); a slide groove (14) is provided in the housing (20); the other end of the U-shaped metal sheet (15) is inserted into the slide groove (14) and is slidably connected to the inner wall of the slide groove (14); through holes are provided at the four end corners of the housing (20) (7), the positioning cylinder (10) is inserted into the through hole (7), the rotating rod (11) extends to the top of the positioning cylinder (10), a spring (12) with one end fixedly connected to the positioning cylinder (10) is installed above the positioning cylinder (10), the spring (12) is sleeved on the rotating rod (11), a limiting plate (9) is fixedly provided above the rotating rod (11), a through groove (8) matching the limiting plate (9) is provided on one side of the through hole (7), and a limiting ring (13) is provided at the upper end of the through hole (7).

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