Automatic temperature control system of gas water heater

Abstract

The invention discloses an automatic temperature control system for a gas water heater, which precisely controls the temperature rise of the water flow by detecting the water flow and selecting the temperature rise by the user, which is different from the traditional technology of using a temperature sensor to control the water temperature. The system includes: a water flow sensor that can detect water flow, a pair of heat exchangers that heat up the water flow, a gas proportional regulating valve that supplies gas to the heat exchanger, a variable potentiometer for users to choose temperature rise, And a control unit that can receive the selected temperature rise and water flow and control the opening of the gas proportional regulating valve after calculation. The control unit makes the gas quantity supplied by the gas proportional regulating valve to the heat exchanger to heat the water flow to the level set by the variable potentiometer. The selected value of temperature rise avoids the problem of burns caused by instantaneous changes in water flow in traditional control methods.

Description

technical field [0001] The present invention is an automatic temperature control system applied to gas water heaters. It precisely controls the temperature rise of the water flow by detecting the water flow rate and selecting the temperature rise by the user. It is different from the traditional technology that uses the water inlet and outlet temperature sensors to control the temperature. water temperature. Background technique [0002] In order to meet the constant temperature requirements of general gas water heaters, its basic control system includes a control device, a heat exchanger, at least one gas valve, and two temperature sensors that detect the water temperature at the water inlet and water outlet respectively; First operate the control device to set a temperature value, when the user turns on the faucet, the water inlet temperature sensor senses the water inlet temperature, and then the control device controls the opening of the gas valve, so that the heat excha...

AI Technical Summary

Problems solved by technology

The main reason is that the traditional technology uses whether the temperature sensed by the temperature sensor at the water outlet reaches the set temperature to control the gas flow, that is, when the user feels the water temperature is higher or lower than the preset temperature, the control device will start The gas flow will be adjusted so that the water temperature will be gradually adjusted to the default value after the outlet water temperature is too high or too low for a period of time, and the effect of real-time adjustment cannot be achieved

[0005] In addition, during the above process, if the water flow rate changes drastically due to the water pressure, especially if the water volume suddenly decreases sharply, and the temperature sensor at the outlet end senses that the temperature is too high, the heat exchanger has been burning for a period of time, so it is easy to Accidents in which users were scalded

Because of this, some countries further regulate that the outlet water temperature of the water heater cannot be higher than the set temperature by 10 degrees, and even must be accurately controlled to within 5 degrees. In this case, the traditional use of temperature sensors at the water inlet and outlet Controlled technology is bound to fail to comply with safety regulations

[0006] In view of this, the inventor has accumulated many years of research and practical experience in related fields, and specially created an automatic temperature control system applied to gas water heaters, which improves the need to install water inlet and outlet temperature sensors in existing gas water heaters, and The control device fails to adjust the gas flow in real time according to the water volume.

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