Automatic fire extinguishing device for photovoltaic junction box

Abstract

The invention discloses an automatic fire extinguishing device for a photovoltaic junction box. The automatic fire extinguishing device for the photovoltaic junction box comprises a gas storage tank,a fire extinguishing mechanism and a disconnecting mechanism which are arranged on the photovoltaic junction box, wherein the gas storage tank is filled with a gas for extinguishing fire, and the fireextinguishing mechanism comprises a fire extinguishing nozzle, a low-melting-point metal sealing plug, and a heat conducting exhaust pipe; one end of the heat conducting exhaust pipe is connected with the gas storage tank, and the other end of the heat conducting exhaust pipe is connected with the fire extinguishing nozzle; the low-melting-point metal sealing plug is arranged in the heat conducting exhaust pipe, and the heat conducting exhaust pipe is connected with a wire connected to a breaker in a heat conducting way. When the photovoltaic junction box is short-circuited, the wiring terminal of the breaker generates a high temperature, so that the line temperature rises. After the heat conducting exhaust pipe is subjected to the heat conduction of the line, the low-melting-point metalsealing plug is slightly melted in a short time; meanwhile, the low-melting-point metal sealing plug is pushed out by the gas pressure provided by the gas storage tank, and then the fire extinguishinggas is ejected from the fire extinguishing nozzle, so that the fire source can be quickly and effectively extinguished, and the stability of automatic fire extinguishing can be improved.

Description

technical field [0001] The invention relates to the field of electrical fire extinguishing, in particular to an automatic fire extinguishing device for a photovoltaic combiner box. Background technique [0002] At present, the photovoltaic combiner boxes on the market already have the functions of confluence, lightning protection and monitoring, and can also detect the temperature and humidity of the combiner box, as well as failure alarm, data collection, wireless data transmission and other functions. Therefore, this makes the wiring of the photovoltaic DC combiner box more and more complex, and also increases the possibility of fire in the photovoltaic DC combiner box. At present, the photovoltaic combiner boxes with automatic fire extinguishing function are automatic fire extinguishing systems built with electronic components such as infrared sensors, temperature sensors, and control chips. The construction of electronic components will definitely increase the number of...

AI Technical Summary

Problems solved by technology

The construction of electronic components will definitely increase the number of wiring inside the combiner box, thereby increasing the possibility of a fire in the photovoltaic combiner box, and the overall safety of the photovoltaic combiner box is relatively reduced.

Moreover, since a fire in a photovoltaic combiner box is not necessarily caused by a short circuit of the wires or an overload current, it may be caused by other environmental factors, and the traditional automatic circuit breaker can only be disconnected when the overcurrent reaches a certain threshold, and other occurrences cannot be avoided. The fire caused by factors melts the wire sheath and causes a short circuit and causes a secondary fire

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