Gas water heater self-adaption wind pressure resisting control method and system

Abstract

The invention discloses a gas water heater self-adaption wind pressure resisting control method. The method is characterized in that when it is set in advance through a main controller that no external wind pressure exists, each fan current corresponds to a fan rotating speed, and each fan rotating speed corresponds to a gas proportional valve current value; when external wind pressure exists, a constant-current control mode is adopted, and fan current corresponding to the same load stays the same; in this way, when external wind pressure increases, constant current is maintained by increasing the voltage of a fan; the input power of the fan becomes larger with the increase of the voltage of the fan, the rotating speed of the fan is increased, and meanwhile, the current of a gas proportional valve is controlled to increase according to the optimal wind-air ratio. The constant-current control mode is adopted, and waste gas backflow or down draft is effectively avoided; meanwhile, the wind-air ratio is automatically adjusted according to the change of the rotating speed of the fan, and it is guaranteed that smoke and efficiency are in the optimal state.

Description

technical field [0001] The invention relates to the field of fluid heater control, in particular to an adaptive wind pressure resistance control method and system for a gas water heater. Background technique [0002] Gas water heaters have been widely used in ordinary households, but the exhaust air problem of gas water heaters is also very prominent, especially when they are installed on high floors and where the external air pressure of the exhaust gas is high. Exhaust gas backflow, downwind, etc. often occur, and even reduce combustion efficiency to produce a large amount of CO, which seriously affects the safety of life and property. [0003] Most of the exhaust devices of current gas water heaters are too simple, and the exhaust fan has a fixed speed and a constant wind speed exhaust. In use, it is found that in some high-rise buildings and high-pressure cyclone airflow areas, due to the changeable high pressure of the airflow, the original fixed speed control method c...

AI Technical Summary

Problems solved by technology

However, this control method is quite rough, and can adjust the fan speed according to the change of external wind pressure, and the combustion effect is not ideal.

In addition, in the prior art, since the maximum speed of the motor is fixed, the speed increase of the fan is limited, and the wind speed enhancement is insufficient, so it is difficult to achieve the best wind resistance effect