Combustion control method of gas water heater based on oxygen sensor

Abstract

The invention relates to a combustion control method of a gas water heater based on an oxygen sensor. The gas water heater comprises a first electromagnetic proportional valve, a second electromagnetic proportional valve, a fan, an igniter, a combustor and a main valve which are used for adjusting combustion parameters and also comprises a main control panel, wherein the main control panel has three operation modes; each operation mode has corresponding combustion parameters; the first electromagnetic proportional valve is switched on under a first-stage operation mode; the second electromagnetic proportional valve is switched on under a second-stage operation mode; both the first electromagnetic proportional valve and the second electromagnetic proportional valve are switched on under a third-stage operation mode. The combustion control method of the gas water heater has the characteristics of by judging the size of actual combustion power and ignition power, then further judging whether the oxygen concentration value detected by the oxygen sensor is deviated from the preset normal oxygen concentration value, and then dynamically adjusting the combustion parameters of the gas water heater so as to ensure that the combustor is not blown out when the wind pressure is excessively high.

Description

technical field [0001] The invention relates to a combustion control method of a gas water heater based on an oxygen sensor. Background technique [0002] Household gas water heaters have to face many uncontrollable factors in the process of use, such as the fluctuation of influent water flow, the purity of combustion gas, the pressure range of combustion gas, and the excessive wind pressure caused by external wind. It 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 that the machine cannot burn caused by excessive wind pressure 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 the problem of being blown out suddenly when burning, which makes the ability of domestic g...

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Problems solved by technology

[0004] For the structure of gas water heater with impermanent open flame structure, see figure 2 As shown, this type of gas water heater has 3 working modes: when the solenoid valve SV1 is opened alone, it works in the 1-stage mode; when the solenoid valve SV2 is opened alone, it works in the 2-stage mode; when the solenoid valve SV1 and the solenoid valve SV2 are opened simultaneously, it works in the 3-stage mode mode, the above three working modes do not have a certain section that is always burning, that is, there is no permanent open flame. At this time, when the 1st section mode and the 2nd section mode are switched to each other, there will be a risk of flameout

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