Gas water heater and control method and system thereof

Abstract

The invention discloses a gas water heater and a control method and system thereof. The control system of the gas water heater comprises a gas source proportional valve arranged on a gas source supply pipeline, and a controller controlling the opening degree of the gas source proportional valve, wherein the controller is electrically connected with the gas source proportional valve; the controller comprises a PWM (pulse width modulation) signal generating circuit for generating the control signals of the gas source proportional valve, and a current regulating network circuit which is composed of at least two selectively-switching current regulating branch circuits; the common input end of the at least two selectively-switching current regulating branch circuits is electrically connected with the output end of the PWM signal generating circuit, and the common output end of the at least two selectively-switching current regulating branch circuits is electrically connected with the control signal input end of the gas source proportional valve. By means of the current regulating network circuit, the gas water heater can automatically adapt to gas sources of different heat values to achieve optimization of burning performance.

Description

technical field [0001] The invention belongs to the technical field of water heater and its control, in particular, it relates to a gas water heater and its control method and control system. Background technique [0002] The main component of natural gas used in gas water heaters is methane, and also contains a small amount of ethane, butane, pentane, carbon dioxide, carbon monoxide, hydrogen sulfide, etc. Due to different regions, the contents of methane and other gases in natural gas are also different, which makes the calorific value of natural gas in different regions vary greatly. The calorific value is different, the amount of gas required to produce the same heat is different, and the ratio of air volume and gas will also be different during the combustion process. However, the existing gas water heaters are generally designed and controlled for a gas source with a calorific value. Therefore, if the calorific value of the gas source changes, it is very easy to have ...

AI Technical Summary

Problems solved by technology

Although the area-specific gas water heater solves the problem of the difference in gas calorific value in different regions, the calorific value of the gas in the same area will also change at different times and under different conditions. At this time, the area-specific water heater will also have calorific value. The above-mentioned problems brought about by the change

Moreover, gas water heaters exclusively for regional use increase the cost of manpower, material resources, and financial resources in the process of design, production, packaging, and transportation, which does not conform to the development trend of energy saving, consumption reduction, and cost reduction.

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