Combustion control method of gas water heater

Abstract

The invention relates to a combustion control method of a gas water heater. The gas water heater comprises a combustor, a proportional valve, a fan and a controller, and is characterized in that a wind pressure sensor is arranged at an exhaust port of the gas water heater, the wind pressure sensor is also connected with the controller, and a wind pressure reference database and a fan rotation speed compensation database are preset and stored in the controller. Compared with the prior art, the method has the advantages that when external wind pressure does not exist, detection values of the fanat different rotating speeds through the wind pressure sensor are stored in advance as wind pressure reference values, the rotating speed compensation amount required of the fan at different reference rotating speed conditions and different wind pressure values existing outside is stored in advance as well, so that the influence of wind pressure generated by the fan on the detection value of thewind pressure sensor can be well avoided, and meanwhile, adjustment on the rotating speed of the fan is accurately controlled, and the control method is more accurate.

Description

technical field [0001] The invention relates to a combustion control method of a gas water heater. Background technique [0002] Household gas water heaters have to face many uncontrollable factors in the process of use, such as fluctuations in water inflow, different combustion gas purity, different pressure of combustion gas, excessive external wind pressure caused by external wind, etc. These factors Both may affect the constant temperature performance of the gas water heater or cause the gas water heater to fail to work normally. Among them, the problem caused by the excessive external wind pressure that the machine cannot burn normally has become increasingly prominent. For example, in high-rise residents in coastal cities, there is often a strong wind force at the air outlet of the water heater. When the wind force reaches a certain strength, the water heater will fail to ignite. , or it is suddenly blown out when burning. These problems make the adaptability of dome...

AI Technical Summary

Problems solved by technology

In gas water heaters, due to the different installation positions of the fan, the air is generally sent into the combustion chamber by blast type and exhaust type; in the blast type, the fan is mostly installed under the burner, and the air outlet of the fan is connected to the combustion chamber. , and blow air into the combustion chamber of the burner; in the draft type, the fan is mostly installed above the burner, the air inlet of the fan is connected with the combustion chamber, and the air is drawn into the combustion chamber so that the external air enters the combustion chamber; the above control method does not Inaccurate, especially for down-blow fans. Even if there is no external wind pressure, the wind pressure sensor itself can detect a certain wind pressure value because the fan is running. In addition, the value of the fan speed increase and the external wind pressure data There is a linear relationship between the size of the control method, which is not accurate, and it is impossible to know exactly how much it should be increased to accurately resist the wind.

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