Protection device for automatic ignition and brennschluss of commercial gas furnace

Abstract

The invention discloses a protection device for automatic ignition and brennschluss of a commercial gas furnace, capable of overcoming unfavorable elements of high temperature, dampness, gas, large popple of air mixing ratio and the like to implement a safe, highly effective and automatic ignition, when a burner is burning out, it is capable of cutting off a fuel gas channel to implement a safe brennschluss protection, at the same time, there is not a fuel gas mother fire, so as to implement an economization and environment protection, and operation is convenient. Therefore, a main controller locating in a controller is connected with a continuous high-frequency high-pressure ignitor and a flame ion detector electrically and respectively, a detection end of the flame ion detector is connected with one arm of a high-pressure occurring end of the continuous high-frequency high-pressure ignitor, two output ends of the continuous high-frequency high-pressure ignitor are connected with two fulcrum indian clubs through two ignition and flame detection interfaces electrically and respectively, a gas electromagnetic valve interface and a switch interface locating in the controller are connected with the gas electromagnetic valve and the switch electrically and respectively.

Description

technical field [0001] The invention relates to the field of gas controllers, in particular to an automatic ignition and flameout protection device for a commercial combustion furnace. Background technique [0002] The commercial gas furnace is characterized by forced combustion with a blower, large volume, high combustion power, and harsh working environment. The diameter of the commercial gas furnace is between 400mm and 1200mm, the combustion power is between 40kw and 150kw, the flame temperature exceeds 1200°C, the furnace temperature exceeds 800°C, and the surface temperature of the furnace body reaches 200°C after long-term work. When igniting, if the air flow is at the maximum and the ignition delay exceeds 1-2 seconds, it will cause deflagration. The gas condition for commercial gas furnaces is that there is a relatively independent gas supply system in the commercial kitchen. The number of commercial gas furnaces working in the same gas system ranges from a few to ...

AI Technical Summary

Problems solved by technology

This method can ensure that the solenoid valve is closed after the main burner is accidentally extinguished, but there are still three problems as follows: First, the potential of the thermocouple can only be low enough to make the solenoid valve go off when the thermocouple is cooled to a certain temperature. More than 10 seconds will cause a large amount of gas to leak during this 10 seconds, so there is a danger of explosion; second, the high-temperature flame of the main burner greatly reduces the life of the thermocouple, which is about 3 months, so its maintenance cost It is very high; the third is that when igniting, you must press the solenoid valve switch with your hand for a few seconds until the thermocouple is heated and generates enough thermoelectric potential to make the solenoid valve close before letting go, which is very inconvenient

So far, although the heat load of household gas appliances is relatively small, automatic ignition safety flameout protection has been enforced. On the contrary, due to technical reasons, automatic ignition and flameout safety have not yet been realized on high-power commercial gas appliances. protection, so safety accidents often occur

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