CN116845719B - Intelligent fire extinguishing system and method for high-low voltage switch cabinet - Google Patents
Intelligent fire extinguishing system and method for high-low voltage switch cabinet Download PDFInfo
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- CN116845719B CN116845719B CN202310860299.7A CN202310860299A CN116845719B CN 116845719 B CN116845719 B CN 116845719B CN 202310860299 A CN202310860299 A CN 202310860299A CN 116845719 B CN116845719 B CN 116845719B
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- 238000000034 method Methods 0.000 title claims description 12
- 238000001514 detection method Methods 0.000 claims abstract description 42
- 230000005540 biological transmission Effects 0.000 claims abstract description 22
- 238000001931 thermography Methods 0.000 claims abstract description 18
- 230000009471 action Effects 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims abstract description 7
- 239000007924 injection Substances 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 21
- 238000005192 partition Methods 0.000 claims description 9
- 238000009423 ventilation Methods 0.000 claims description 6
- 230000008447 perception Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 61
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 46
- 229910002092 carbon dioxide Inorganic materials 0.000 description 23
- 239000001569 carbon dioxide Substances 0.000 description 23
- 238000013461 design Methods 0.000 description 10
- 230000002265 prevention Effects 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000000443 aerosol Substances 0.000 description 2
- 239000002274 desiccant Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
- A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
- A62C37/38—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone
- A62C37/40—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone with electric connection between sensor and actuator
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
- A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
- A62C37/38—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone
- A62C37/42—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone with mechanical connection between sensor and actuator, e.g. rods, levers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/24—Circuit arrangements for boards or switchyards
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/30—Cabinet-type casings; Parts thereof or accessories therefor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/30—Cabinet-type casings; Parts thereof or accessories therefor
- H02B1/32—Mounting of devices therein
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/56—Cooling; Ventilation
- H02B1/565—Cooling; Ventilation for cabinets
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
Abstract
An intelligent fire extinguishing system of a high-low voltage switch cabinet comprises a cabinet body, a cabinet door and a control unit, wherein a plurality of distribution switches are arranged in the front of the cabinet body, a gas storage bin is arranged at the rear of the cabinet body, and fire extinguishing gas is filled in the gas storage bin; the wiring port positions of the power distribution switches are provided with an injection unit and a first temperature detection unit, the first temperature detection unit is used for acquiring temperature information of the wiring port positions, and the cabinet body is internally provided with a second temperature detection unit at a position close to a cabinet door and used for acquiring the internal temperature of the cabinet body; the cabinet door is provided with an infrared thermal imaging sensing device and a control unit; the cabinet body lower part is equipped with the unit that admits air, and upper portion is equipped with exhaust unit and check valve, and the unit department of admitting air and exhaust all is provided with intelligent closed system, and the signal of first temperature detecting element, second temperature detecting element and infrared thermal imaging perception device transmission is received to the control unit, and control ooff valve and intelligent closed system action. The system adopts multi-stage protection, and can more effectively prevent fire disaster aiming at high temperature in summer.
Description
Technical Field
The invention relates to the technical field of intelligent fire prevention of power equipment, in particular to an intelligent fire extinguishing system and method for a high-low voltage switch cabinet.
Background
The high-low voltage switch cabinet is the equipment for connecting high-voltage or low-voltage cables, and is an electrical equipment which is formed by assembling a plurality of protective devices such as switch breakers into a whole.
The high-low voltage cabinet is a voltage transformation center of power supply, and a fire-fighting automatic fire extinguishing system needs to be arranged, because once a large-scale fire occurs, the whole branch power grid is paralyzed for a long time.
The common method for extinguishing fire in the cabinet is to monitor the temperature in the cabinet by adopting a temperature sensor and then control the opening and closing of the valve port of the fire extinguishing gas cylinder to extinguish the fire. However, this has some hysteresis, and the temperature does not rise rapidly when a fire is generated due to a short circuit or the like in the cabinet. Accordingly, the applicant has previously filed a fire extinguishing group in a high and low voltage switchgear cabinet, patent number CN202021361987.7, see fig. 1. In the scheme, firstly, a taper sleeve for containing a certain amount of carbon dioxide gas is arranged at a wiring port to extinguish small fire, and then after a smoke signal exists in a cabinet body through a smoke sensor electromagnetic valve, the carbon dioxide gas in the gas bin 2 is controlled to be sprayed out from the air spraying hole 6 to extinguish the fire. Various problems are found in the subsequent use process:
(1) The conical sleeve at the junction cannot be made very large because the size of each distribution switch is basically fixed, so that the carbon dioxide gas contained in the distribution switch is very small, and the distribution switch is insufficient to extinguish the flame in many cases.
(2) The fire-extinguishing agent is greatly influenced by the ambient temperature and has good effect in winter, but the ignition point is easy to reburning in summer with high temperature.
(3) The smoke sensor has sensitive response, once the ignition point appears, the smoke sensor can report by mistake and always spray the generated aerosol until all the aerosol is sprayed, so that waste is caused.
(4) After the gas in the gas bin is sprayed out, the gas is discharged to the outside from the ventilation net and the ventilation bin, so that the residual in the cabinet body is less, the cabinet body is safe in winter, and the ignition point can not be blocked for a long time in high-temperature summer.
Because the circuit in the high-low voltage switch cabinet is generally overloaded, short-circuited or overvoltage and the like, the circuit is a process of gradually accumulating and then generating the fire, and even if the circuit is extinguished once, the circuit is easy to re-burn again, especially in summer with high temperature. Thus, fire suppression groups like the applicant's previous designs are not well suited for long-term preventive fire suppression.
Disclosure of Invention
The invention provides an intelligent fire extinguishing system and method for a high-low voltage switch cabinet, aiming at solving the technical problem that a circuit in the high-temperature summer high-low voltage switch cabinet is easy to catch fire in the background technology.
The technical scheme of the invention is as follows:
the intelligent fire extinguishing system for the high-low voltage switch cabinet comprises a cabinet body, a cabinet door and a control unit, wherein a plurality of distribution switches are arranged in the front of the cabinet body, a gas storage bin is arranged at the rear of the cabinet body, and fire extinguishing gas such as carbon dioxide gas is filled in the gas storage bin. The gas storage bin is arranged at the rear of the cabinet body, compared with the mode of being integrated in the front cabinet door before, the gas storage bin can be conveniently connected with fire extinguishing components without affecting the arrangement of other electrical components, and is more convenient to inflate and maintain.
The wiring port of the distribution switch is provided with an injection unit and a first temperature detection unit, the injection unit comprises a transmission pipe and a conical sleeve, one end of the transmission pipe is communicated with the gas storage bin, the other end of the transmission pipe is communicated with the conical sleeve, and a switch valve is arranged between the transmission pipe and the gas storage bin;
the inside vertical direction of toper cover is equipped with hollow inner chamber, can hold the wire and pass and be connected with the distribution switch, and the outside encircles there is outer cavity, and outer cavity outside wall and transmission tube intercommunication, inside wall are equipped with a plurality of air vents and inner chamber intercommunication.
Further, the front side of the outer wall of the conical sleeve is provided with a channel for accommodating the lead wire to enter the inner cavity, the rear side of the conical sleeve is provided with a through hole communicated with the outer cavity, and the upper size of the inner cavity is smaller than the lower size of the inner cavity.
Compared with the prior mode of only containing a certain amount of carbon dioxide gas in the outer cavity of the conical sleeve to extinguish the fire at the junction, the invention changes the mode of supplying fire extinguishing gas in an unlimited amount on one hand, and sprays the fire extinguishing gas in advance through temperature sensing to cool down on the other hand, thereby preventing the temperature rise of a circuit caused by short circuit and the like and further ensuring the problem of fire. The problem that a small amount of carbon dioxide gas in the outer cavity is covered by the drying agent layer in the previous design, the carbon dioxide gas can be released after being ignited, a flame is formed at the moment, the flame can not be effectively sprayed only by a small amount of carbon dioxide gas in the outer cavity, and the problem of re-combustion easily occurs is effectively solved.
Further, the first temperature detection unit is used for acquiring temperature information of the position of the wiring port, and the cabinet body is internally provided with a second temperature detection unit at a position close to the cabinet door, and the second temperature detection unit is used for acquiring temperature in the cabinet body. When the temperature of the wiring port is higher than the temperature in the cabinet body and reaches a preset threshold value, the circuit is heated, fire is not yet generated, fire extinguishing gas is sprayed to cool the circuit, meanwhile, a worker can remotely receive a corresponding alarm signal, and relevant measures are taken in time to prevent the circuit from further heating up or even generating fire.
The cabinet door is provided with the infrared thermal imaging sensing device and the control unit, and is powered by an independent power supply, so that the control unit is prevented from immediately losing efficacy after the circuit is started, and the staff has response time. Preferably, the infrared thermal imaging sensing device is positioned at the middle position of the inner side of the cabinet door, so that the flame position in the cabinet body can be conveniently observed.
The lower part of the cabinet body is provided with an air inlet unit, the upper part of the cabinet body is provided with an air outlet unit and a one-way valve, and intelligent sealing systems are arranged at the air inlet unit and the air outlet unit to seal the air inlet and the air outlet;
the control unit receives signals transmitted by the first temperature detection unit, the second temperature detection unit and the infrared thermal imaging sensing device, and controls the switch valve and the intelligent closed system to act. The detection and control components used in the fire extinguishing system adopt an independent power supply to supply power and are separated from the power utilization components in the cabinet body.
The transmission pipe is multipurpose, the inner part is used for transmitting fire extinguishing gas, and the outer part is used for fixing a wire. Specifically, the transmission pipe is divided into first linkage segment, supporting segment and second linkage segment in proper order, and first linkage segment is connected with the gas storage storehouse, and the second linkage segment is connected with the toper cover, and supporting segment arches upwards, is fixed with a plurality of card wire loops on it for fixed wire.
Regarding the design of the air inlet unit, the air inlet unit comprises an air inlet chamber positioned at the bottom of the cabinet body, an air inlet is formed in the front side of the air inlet chamber, an air inlet net is arranged on the upper portion of the air inlet chamber, external air enters the air inlet chamber from the air inlet net, then enters an area where a distribution switch is arranged in the cabinet body from the air inlet net, a sealing plate is movably arranged at the air inlet, and the sealing plate can seal the air inlet under the action of a power device.
Regarding the design of the exhaust unit, it includes an exhaust port arranged on the side wall of the upper part of the cabinet body and a sealing plate positioned in the interior of the cabinet body, the sealing plate can seal the exhaust port under the action of the power device, and the exhaust port is equipped with an exhaust fan.
The cabinet body in the fire extinguishing system adopts a rectangular structure, a partition plate is arranged between the front surface and the rear surface, a power distribution switch is assembled on the partition plate, a gas storage bin is vertically arranged behind the partition plate, and a second temperature detection unit is positioned on the upper portion of the cabinet body.
The invention also provides an intelligent fire extinguishing method for the high-low voltage switch cabinet, which adopts the intelligent fire extinguishing system for the high-low voltage switch cabinet, and comprises the following specific steps:
s1, carrying out matching analysis on a feedback image of an infrared thermal imaging device and a fire model;
if the analysis result judges that the fire signal exists, analyzing the position of the fire source point, and executing the following steps:
s11, opening intelligent sealing systems at the air inlet unit and the air outlet unit to seal the air inlet and the air outlet;
s12, opening corresponding switch valves according to the fire source point positions, opening corresponding time according to the opening quantity of the switch valves based on a preset quantity-time curve chart, and then closing;
quantity-the number of opening of the switching valve and the time in the time graph satisfy the following formula:
(n a) t=v, wherein,
n is the number of opening of the switch valve;
a is the discharge amount of fire extinguishing gas in unit time when a single switch valve is opened;
t is the opening time;
v is the volume of the internal space of the cabinet body.
If the analysis result determines that the fire signal is not present, S2 is executed;
s2, comparing the temperature detected by the first temperature detection unit with a first temperature threshold;
if the feedback temperature value of the first temperature detection unit is larger than a first temperature threshold value, controlling a switch valve corresponding to the power distribution switch at the monitoring position of the first temperature detection unit to be opened for T1 time, and then closing the switch valve;
if the feedback temperature value of the first temperature detection unit is smaller than the first temperature threshold value, S3 is executed;
s3, comparing the temperature detected by the second temperature detection unit with a second temperature threshold;
if the feedback temperature value of the second temperature detection unit is larger than the second temperature threshold value, the intelligent closed systems at the air inlet unit and the air outlet unit are closed, the air outlet fan is opened, so that external air enters from the lower part of the cabinet body, flows through the power distribution switch, and then flows out from the air outlet fan at the upper part of the cabinet body.
Further, in the steps S1 and S2, after waiting for T2 after the switching valve is closed, step S1 is performed again. The fire extinguishing gas T2 can be filled in the cabinet body for a period of time, and the afterburning is effectively prevented.
The intelligent fire extinguishing system of the high-low voltage switch cabinet has the beneficial effects that:
(1) The infrared thermal imaging device is characterized in that the infrared thermal imaging device is protected in multiple stages, different actions are performed according to the feedback image of the infrared thermal imaging device, the temperature detected by the first temperature detection unit and the temperature detected by the second temperature detection unit, the priority is from high to low, and different processing modes are designed from fire burst to fire prevention.
(2) The overall structure layout is more prone to long-term prevention of fire, is micro-gradual, and starts to cool through the exhaust fan when the temperature in the cabinet body rises, and when the circuit wire starts to heat, the preset quantity of fire extinguishing gas is sprayed to cool and isolate air, and the staff is informed in time, so that the fire is prevented.
(3) The air inlet unit is arranged at the lower part, the air exhaust unit and the check valve are arranged at the upper part, and the intelligent closed system is respectively arranged, so that on one hand, low-temperature gas at the lower part of the cabinet body can be introduced into the cabinet body to flow out from the upper part after the temperature of the distribution switch is reduced, and on the other hand, when fire happens, carbon dioxide gas sprayed into the cabinet body can sink to the bottom of the cabinet body and extrude internal air from the check valve under the action of pressure, thereby only carbon dioxide gas exists in the cabinet body, fresh air does not enter, and the phenomenon of afterburning can be effectively prevented.
Drawings
In the drawings:
FIG. 1 is a schematic illustration of a product previously filed by the applicant;
FIG. 2 is a schematic diagram of the intelligent fire extinguishing system of the high-low voltage switch cabinet;
FIG. 3 is a schematic view of the structure of the spray unit;
FIG. 4 is a cross-sectional view of a conical sleeve;
the components represented by the reference numerals in the figures are:
1. a cabinet body; 2. a cabinet door; 3. a power distribution switch; 4. a gas storage bin; 5. a spraying unit; 51. a transmission tube; 52. a conical sleeve; 521. an outer chamber; 522. an inner chamber; 53. a wire clamping ring; 6. an air intake unit; 61. an air inlet hole; 62. a ventilation screen; 7. an exhaust unit; 71. a sealing plate; 72. an exhaust fan; 8. an infrared thermal imaging sensing device; 9. a first temperature detection unit; 10. and a second temperature detecting unit.
Detailed Description
Referring to fig. 2, an intelligent fire extinguishing system for high and low voltage switch cabinets comprises a rectangular cabinet body 1, a cabinet door 2 and a control unit, wherein a plurality of power distribution switches 3 are assembled in the front of the cabinet body 1, and the power distribution switches are designed the same as those of the applicant, so that the intelligent fire extinguishing system is only schematically shown in fig. 2. Compared with the prior design, the cabinet body 1 is provided with the gas storage bin 4 at the back, the partition board is arranged between the front and the back of the cabinet body 1, and the distribution switch 3 is assembled on the partition board. The gas storage 4 is filled with a fire extinguishing gas, such as carbon dioxide gas. The gas storage bin 4 is arranged behind the cabinet body 1, compared with the mode of being integrated in the front cabinet door 2 before, the fire extinguishing device can be conveniently connected with fire extinguishing components without affecting the arrangement of other electrical components, and is more convenient to inflate and maintain.
Referring to fig. 3, the position of the wiring port of the distribution switch 3 is provided with an injection unit 5 and a first temperature detection unit 9, the injection unit 5 comprises a transmission pipe 51 and a conical sleeve 52, one end of the transmission pipe 51 passes through the partition plate and then is communicated with the gas storage bin 4, the other end of the transmission pipe is communicated with the conical sleeve 52, and a switching valve is arranged between the transmission pipe 51 and the gas storage bin 4. The first temperature detecting unit 9 is used for detecting the temperature of the wire connection part of the distribution switch 3, and when the wire is short-circuited, the temperature is generally raised first and then the fire is caused. By detecting the temperature of the wire connection part, the circuit state can be conveniently known in advance, the fire extinguishing gas is sprayed in advance through the spraying unit 5, the fire extinguishing gas is prevented from happening, meanwhile, the action of the switch valve can be remotely known by a worker, and countermeasures can be timely made.
Referring to fig. 4, a hollow inner chamber 522 is vertically arranged in the conical sleeve 52, and can accommodate wires to pass through and be connected with the distribution switch 3, an outer chamber 521 is surrounded on the outer side, the outer side wall of the outer chamber 521 is communicated with the transmission pipe 51, and a plurality of ventilation holes are arranged on the inner side wall and are communicated with the inner chamber 522.
Further, the upper half section of the inner chamber 522 is a vertical hollow chamber, so that the wire is convenient to insert, and the lower half section is a conical chamber, and the size of the upper half section is larger than that of the wire fixing bolt at the top of the distribution switch 3.
Further, the front side of the outer wall of the conical sleeve 52 is provided with a channel (not shown) for accommodating the wire into the inner chamber 522, the design is the same as that before, the rear side is provided with a through hole communicated with the outer chamber 521, and the upper dimension of the inner chamber 522 is smaller than the lower dimension.
The transmission pipe 51 of the present invention is multipurpose, and is used for transmitting fire extinguishing gas inside and fixing wires outside. Specifically, the transmission pipe 51 is sequentially divided into a first connecting section, an inverted U-shaped supporting section and a second connecting section, wherein the first connecting section is connected with the gas storage bin 4, the second connecting section is communicated with the outer chamber 521 of the conical sleeve 52, the supporting section is arched upwards, and a plurality of wire clamping rings 53 are fixed on the supporting section and used for fixing wires.
In contrast to the prior art of containing only a certain amount of carbon dioxide gas within the outer chamber 521 of the conical sleeve 52 to extinguish a fire at the junction, the present invention on the one hand changes to an unlimited supply of fire extinguishing gas, with the on-off valve controlling the carbon dioxide gas to enter the junction within the conical sleeve 52 along the transfer tube 51. On the other hand, fire extinguishing gas is sprayed in advance through temperature induction to cool down, so that the problem that the circuit is heated up and fires due to short circuit and the like is well guaranteed. The problems that a small amount of carbon dioxide gas in the outer chamber 521 is covered by the drying agent layer in the previous design, the carbon dioxide gas can be released after being ignited, a flame is formed at the moment, the flame can not be effectively sprayed only by the small amount of carbon dioxide gas in the outer chamber 521, the optimal prevention opportunity is missed, and the reburning is easy to occur are effectively solved.
In this embodiment, the first temperature detecting unit 9 is used for acquiring temperature information of the position of the wire connection port, and the top of the cabinet body 1 is provided with the second temperature detecting unit 10 near the cabinet door 2, so as to acquire the temperature inside the cabinet body 1. When the temperature of the wiring port is higher than the temperature in the cabinet body 1 and reaches a preset threshold value, the circuit is heated up and does not fire, and fire extinguishing gas is sprayed to cool the circuit at the moment, meanwhile, staff can remotely receive corresponding alarm signals, and timely take relevant measures to prevent the circuit from further heating up and even firing.
Referring to fig. 1, the cabinet door 2 of the present invention is no longer used as a fire extinguishing gas storage and spraying unit, and is provided with an infrared thermal imaging sensing device 8 and a control unit, and is powered by a single power supply, so that the control unit is prevented from being immediately disabled after the circuit is ignited, and the staff has reaction time.
Preferably, the infrared thermal imaging sensing device 8 is positioned at the middle position of the inner side of the cabinet door 2, so that the flame position inside the cabinet body 1 can be conveniently observed.
The embodiment also carries out corresponding design on the air inlet and outlet line and the opening and closing modes so as to adapt to the fire extinguishing modes of different conditions.
Referring to fig. 1, an air inlet unit 6 is arranged at the lower part of the cabinet body 1, an air outlet unit 7 and a one-way valve are arranged at the upper part, intelligent sealing systems are arranged at the air inlet unit 6 and the air outlet unit 7 to seal the air inlet and outlet, after the one-way valve is used for injecting carbon dioxide gas, the density of the carbon dioxide gas is greater than that of air, when the pressure in the cabinet reaches a preset value, only the air in the cabinet body is allowed to be discharged from the top, and no fresh air enters the cabinet body.
The control unit receives signals transmitted by the first temperature detection unit 9, the second temperature detection unit 10 and the infrared thermal imaging sensing device 8, automatically controls the on-off valve and the intelligent closed system to act, and in addition, a worker can remotely check and operate the control unit to execute related instructions. The detection and control components used in the fire extinguishing system of the invention are powered by an independent power supply and are separated from the power utilization components in the cabinet body 1.
Regarding the design of the air inlet unit 6, the air inlet unit comprises an air inlet chamber positioned at the bottom of the cabinet body 1, an air inlet is formed in the front side of the air inlet chamber, an air inlet net 62 is arranged at the upper part of the air inlet chamber, external air enters the air inlet chamber from the air inlet, and then enters the area of the cabinet body 1 where the power distribution switch 3 is arranged from the air inlet net 62. The air temperature at the bottom of the cabinet body is relatively low, and when the temperature in the cabinet is high, the lower air can be extracted to cool the distribution switch 3.
Further, the air inlet is movably provided with a sealing plate, and the sealing plate can seal the air inlet under the action of the power device.
Regarding the design of the exhaust unit 7, it includes an exhaust port arranged on the upper side wall of the cabinet 1 and a sealing plate 71 located inside the cabinet 1, the sealing plate 71 being capable of sealing the exhaust port under the action of a power unit, the exhaust port being equipped with an exhaust fan 72.
The invention also provides an intelligent fire extinguishing method for the high-low voltage switch cabinet, which adopts the intelligent fire extinguishing system for the high-low voltage switch cabinet, and respectively starts the intelligent closed system, the switch valve, the exhaust fan and the like by designing different priorities so as to apply different stages of circuit ignition, and comprises the following specific steps:
s1, matching and analyzing the feedback image of the infrared thermal imaging device with a fire model. This is the highest priority, and it is first determined whether a fire has occurred in the cabinet.
If the analysis result judges that the fire signal exists, analyzing the position of the fire source point, and executing the following steps:
s11, opening an intelligent sealing system at the air inlet unit 6 and the air outlet unit 7 to seal the air inlet and the air outlet, and preventing fresh air from continuously rushing into the cabinet body 1 to support combustion.
S12, opening corresponding switch valves according to the fire source point positions, opening corresponding time according to the opening quantity of the switch valves based on a preset quantity-time curve chart, and then closing;
quantity-the number of opening of the switching valve and the time in the time graph satisfy the following formula:
(n a) t=v, wherein,
n is the number of opening of the switch valve;
a is the discharge amount of fire extinguishing gas in unit time when a single switch valve is opened;
t is the opening time;
v is the volume of the internal space of the cabinet body 1.
After the switch valve is opened for a corresponding time, the inside of the cabinet body 1 is filled with carbon dioxide gas, and air is discharged from the one-way valve into the cabinet body 1, so that the inside of the cabinet body 1 is kept in an anaerobic state, and the back combustion of fire is prevented.
If the analysis result determines that the fire signal is not present, S2 is executed;
s2, comparing the temperature detected by the first temperature detection unit 9 with a first temperature threshold value. This is an intermediate priority for determining if the circuit is warming up and has not yet fired.
If the feedback temperature value of the first temperature detection unit 9 is larger than the first temperature threshold value, the switch valve corresponding to the position power distribution switch 3 monitored by the first temperature detection unit 9 is controlled to be opened for T1 time, and then closed.
And a certain amount of carbon dioxide gas is sprayed to the circuit heating point in advance, so that the temperature is reduced, air can be isolated, and the ignition is prevented.
If the first temperature detection unit 9 feeds back a temperature value smaller than the first temperature threshold value, S3 is performed;
and S3, comparing the temperature detected by the second temperature detection unit 10 with a second temperature threshold value. This is the lowest priority for preventing the circuit from warming up and firing due to the high temperature in summer.
If the feedback temperature value of the second temperature detection unit 10 is greater than the second temperature threshold value, the intelligent closed systems at the air inlet unit 6 and the air outlet unit 7 are closed, the sealing plates are opened, the air outlet fan 72 is opened, so that the external air enters from the lower part of the cabinet body 1, flows through the power distribution switch 3, and then flows out from the air outlet fan 72 at the upper part of the cabinet body 1.
Further, in the steps S1 and S2, after waiting for T2 after the switching valve is closed, step S1 is performed again. The interior of the cabinet body 1 can be always filled with fire extinguishing gas T2 for a period of time, and the afterburning is effectively prevented. The system can be prevented from directly executing S3 after S1 and S2 are executed, and the exhaust fan 72 is opened, so that carbon dioxide gas is discharged quickly. Meanwhile, the device is a great improvement on the prior scheme, and in the prior patent, after the carbon dioxide is sprayed out, the carbon dioxide flows away from the bottom ventilation net along with flue gas and air, so that the consumption of fire extinguishing gas is increased, and reburning is easy to generate.
Claims (8)
1. The intelligent fire extinguishing system for the high-low voltage switch cabinet is characterized by comprising a cabinet body (1), a cabinet door (2) and a control unit, wherein a plurality of distribution switches (3) are arranged in the front of the cabinet body (1), a gas storage bin (4) is arranged at the rear of the cabinet body, and fire extinguishing gas is filled in the gas storage bin (4);
the wiring port positions of the distribution switch (3) are respectively provided with an injection unit (5) and a first temperature detection unit (9), the injection units (5) comprise transmission pipes (51) and conical sleeves (52), one ends of the transmission pipes (51) are communicated with the gas storage bin (4), the other ends of the transmission pipes are communicated with the conical sleeves (52), and switching valves are arranged between the transmission pipes (51) and the gas storage bin (4);
a hollow inner chamber (522) is arranged in the conical sleeve (52) in the vertical direction, a wire can be accommodated and connected with the distribution switch (3), an outer chamber (521) is surrounded on the outer side, the outer side wall of the outer chamber (521) is communicated with the transmission pipe (51), and a plurality of ventilation holes are formed in the inner side wall and are communicated with the inner chamber (522);
the first temperature detection unit (9) is used for acquiring temperature information of a wiring port, and the second temperature detection unit (10) is arranged in the cabinet body (1) at a position close to the cabinet door (2) and used for acquiring the internal temperature of the cabinet body (1);
an infrared thermal imaging sensing device (8) and a control unit are arranged on the cabinet door (2);
an air inlet unit (6) is arranged at the lower part of the cabinet body (1), an air outlet unit (7) and a one-way valve are arranged at the upper part of the cabinet body, and intelligent sealing systems are arranged at the air inlet unit (6) and the air outlet unit (7) so as to seal the air inlet and outlet;
the air inlet unit (6) comprises an air inlet chamber positioned at the bottom of the cabinet body (1), an air inlet is formed in the front side of the air inlet chamber, an air inlet net (62) is arranged at the upper part of the air inlet chamber, external air enters the air inlet chamber from the air inlet, then enters an area where the distribution switch (3) is arranged in the cabinet body (1) from the air inlet net (62), a sealing plate is movably arranged at the air inlet, and the sealing plate can seal the air inlet under the action of the power device;
the exhaust unit (7) comprises an exhaust port arranged on the side wall of the upper part of the cabinet body (1) and a sealing plate (71) positioned in the cabinet body (1), wherein the sealing plate (71) can seal the exhaust port under the action of a power device, and the exhaust port is provided with an exhaust fan (72);
the control unit receives signals transmitted by the first temperature detection unit (9), the second temperature detection unit (10) and the infrared thermal imaging sensing device (8), and controls the on-off valve and the intelligent closed system to act.
2. The intelligent fire extinguishing system of the high-low voltage switch cabinet according to claim 1, wherein the transmission pipe (51) is sequentially divided into a first connecting section, a supporting section and a second connecting section, the first connecting section is connected with the gas storage bin (4), the second connecting section is connected with the conical sleeve (52), the supporting section is arched upwards, and a plurality of wire clamping rings (53) are fixed on the supporting section and used for fixing wires.
3. The intelligent fire extinguishing system of a high-low voltage switch cabinet according to claim 2, wherein the front side of the outer wall of the conical sleeve (52) is provided with a channel for accommodating a wire to enter the inner chamber (522), the rear side is provided with a through hole communicated with the outer chamber (521), and the upper size of the inner chamber (522) is smaller than the lower size.
4. The intelligent fire extinguishing system of the high-low voltage switch cabinet according to claim 1, wherein the infrared thermal imaging sensing device (8) is located at the middle position inside the cabinet door (2).
5. The intelligent fire extinguishing system of the high-low voltage switch cabinet according to claim 1, wherein the cabinet body (1) is of a rectangular structure, a partition plate is arranged between the front surface and the rear surface, the power distribution switch (3) is assembled on the partition plate, the gas storage bin (4) is vertically arranged behind the partition plate, and the second temperature detection unit (10) is located on the upper portion of the cabinet body (1).
6. An intelligent fire extinguishing method for a high-low voltage switch cabinet, which is characterized by adopting the intelligent fire extinguishing system for the high-low voltage switch cabinet according to any one of claims 1-5, and comprises the following specific steps:
s1, carrying out matching analysis on a feedback image of an infrared thermal imaging device (8) and a fire model;
if the analysis result judges that the fire signal exists, analyzing the position of the fire source point, and executing the following steps:
s11, opening intelligent sealing systems at the air inlet unit (6) and the air outlet unit (7) to seal the air inlet and the air outlet;
s12, opening corresponding switch valves according to the fire source point positions, opening corresponding time according to the opening quantity of the switch valves based on a preset quantity-time curve chart, and then closing;
if the analysis result determines that the fire signal is not present, S2 is executed;
s2, comparing the temperature detected by the first temperature detection unit (9) with a first temperature threshold value;
if the feedback temperature value of the first temperature detection unit (9) is larger than a first temperature threshold value, controlling a switch valve corresponding to the position power distribution switch (3) monitored by the first temperature detection unit (9) to be opened for T1 time, and then closing;
if the feedback temperature value of the first temperature detection unit (9) is smaller than the first temperature threshold value, S3 is executed;
s3, comparing the temperature detected by the second temperature detection unit (10) with a second temperature threshold value;
if the feedback temperature value of the second temperature detection unit (10) is larger than the second temperature threshold value, the intelligent closed systems at the air inlet unit (6) and the air outlet unit (7) are closed, the air outlet fan (72) is opened, so that external air enters from the lower part of the cabinet body (1), flows through the power distribution switch (3), and then flows out from the air outlet fan (72) at the upper part of the cabinet body (1).
7. The intelligent fire extinguishing method for a high and low voltage switchgear according to claim 6, wherein in the steps S1 and S2, the step S1 is executed after waiting for T2 after the switching valve is closed.
8. The intelligent fire extinguishing method for high and low voltage switch cabinets according to claim 6, wherein the number-time graph has the following formulas for the number and time of opening the switch valves:
(n a) t=v, wherein,
n is the number of opening of the switch valve;
a is the discharge amount of fire extinguishing gas in unit time when a single switch valve is opened;
t is the opening time;
v is the volume of the internal space of the cabinet body.
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| CN202310860299.7A CN116845719B (en) | 2023-07-13 | 2023-07-13 | Intelligent fire extinguishing system and method for high-low voltage switch cabinet |
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| CN202310860299.7A CN116845719B (en) | 2023-07-13 | 2023-07-13 | Intelligent fire extinguishing system and method for high-low voltage switch cabinet |
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| Publication number | Publication date |
|---|---|
| CN116845719A (en) | 2023-10-03 |
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