System and method for controlling combustion of gas water heater or wall-hanging stove

Abstract

The invention discloses a combustion control system for a gas water heater or a wall-hanging stove and a control method thereof. The system comprises a flue gas channel composed of a combustor, a heat exchanger, a stepless variable speed fan and a smoke pipe which are sequentially connected, a control unit connected with the signal input end of the stepless variable speed fan and an air pressure sensor assembly for detecting pressure signals of the upstream of the stepless variable speed fan, and the signal output end of the air pressure sensor assembly is connected with the control unit. The control unit comprises a storage and a controller, the storage is used for storing the corresponding relation between the pressure signals of the upstream of the stepless variable speed fan and heating loads of the combustor, and the controller is used for controlling operation of the stepless variable speed fan according to the corresponding relation. By detecting the pressure signals of the upstream of the stepless variable speed fan, the rotating speed of the upstream of the stepless variable speed fan is further adjusted, and the combustion control system has high wind-resistant performance.

Description

technical field [0001] The present application relates to the field of water heaters, in particular to a gas water heater or wall-hung boiler combustion control system and a control method thereof. Background technique [0002] In the prior art, there are different requirements for the heat load of the burner of the gas water heater or the wall-hung boiler according to the different requirements for the amount and temperature of the hot water. For example, when a large amount of hot water is needed, the burner needs to have a relatively large heat load, while when a small amount of hot water is needed, the burner needs to have a relatively small heat load. [0003] At present, it is mainly to control the current of the proportional valve and the fan, and then realize the control of the heat load of the burner. Specifically, when a larger heat load is required, a larger current will be provided to the proportional valve, so that the proportional valve can have a larger openi...

AI Technical Summary

Problems solved by technology

It can be seen that before the current decrease is less than the critical value, the fan current will not be compensated, and the combustion air flow rate will decrease at this time, which will affect the combustion state and reduce the heat load of the burner

Furthermore, due to the existence of reverse wind pressure, even if the speed of the fan is increased, the matching of the combustion air flow rate is still inaccurate, and the flow rate of the combustion air is still lower than the state without reverse wind pressure. According to the previous description, when the fan speed is compensated After that, due to the low combustion air flow rate, the heat load of the water heater is still low, and it is difficult to meet the requirements of hot water volume and temperature

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