Gas water heater and control method of gas water heater

Abstract

The invention discloses a gas water heater and a control method of the gas water heater. The gas water heater comprises a heat exchanger, a catalytic combustor, a preheating combustor, a premixing cavity, a draught fan and a gas proportional valve, wherein the premixing cavity is connected with an air inlet pipeline and a gas inlet pipeline, the draught fan is arranged on the air inlet pipeline and used for controlling air supply, a draught fan rotating speed detector is arranged on the draught fan, and the gas proportional valve is arranged on the gas inlet pipeline and used for controlling gas supply. According to the gas water heater, under the condition that a contact type thermocouple is not required to be arranged, the gas water heater can control the working states of the preheatingcombustor and the catalytic combustor by detecting the opening degree of the gas proportional valve and the rotating speed of the draught fan, so that the working state of the gas water heater is controlled, and it can be guaranteed that the cost of the gas water heater is low.

Description

technical field [0001] The invention relates to the field of electrical appliances, in particular, to a gas water heater and a control method for the gas water heater. Background technique [0002] A gas water heater is a device that heats cold water by burning gas. At present, most gas-fired water heaters use flame combustion, and a large amount of harmful gases such as CO (carbon monoxide) and NOx (nitrogen oxides) are easily emitted during the combustion process, which not only harms personal safety but also pollutes the environment. Therefore, the use of safe and efficient catalytic combustion has become the development direction of gas water heater technology. [0003] However, contact ion detectors used in traditional gas water heaters are currently used to monitor whether the flame is extinguished, but catalytic combustion is flameless combustion, and its heat transfer path is mainly infrared radiation. Therefore, contact ion detectors are effective for catalytic com...

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Problems solved by technology

[0003] However, at present, the contact ion detector used in traditional gas water heaters is used to monitor whether the flame is turned off, but the catalytic combustion is flameless combustion, and its heat transfer path is mainly based on infrared radiation. Therefore, the contact ion detector is very important for the detection of catalytic combustion. Ineffective, although the contact thermocouple can monitor whether the catalytic combustion reaches the light-off temperature of the catalyst and the flameless combustion state, but the cost of the contact thermocouple is high, and there may be problems such as detection lag after the catalytic burner is accidentally extinguished

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