Gas water heater with water regulating proportional valve in bypass pipe

Abstract

The invention discloses a gas water heater with a water regulating proportional valve in a bypass pipe and relates to the field of water heaters. The gas water heater with the water regulating proportional valve in the bypass pipe includes a housing; the housing is internally provided with a heat exchanger, a combustion tank, a fan, a gas proportional valve, a water inlet pipe, a water outlet pipeand a water regulating proportional valve; the bypass pipe is arranged between the water inlet pipe and the water outlet pipe, and the water regulating proportional valve is arranged on the bypass pipe; the housing is internally provided with a main controller which receives the signals of a temperature sensor I, a water flow sensor, a temperature sensor II and a temperature sensor III, and instructions are sent to the water regulating proportional valve by the main controller; by adding the water regulating proportional valve in the bypass pipe and being matched with a control system, the water flow can be measured, and the water flow can be adjusted and controlled; and the functions of closing an opening and cutting off the water flow are achieved to solve the shortage in the prior art.

Description

technical field [0001] The invention relates to the field of water heaters, in particular to a gas water heater with a bypass pipe and a proportional water adjustment valve. Background technique [0002] During the use of the gas water heater, after the tap is suddenly turned off and the water stops, when the tap is turned on again, the water temperature may suddenly rise, and then there will be a period of cold water, and the alternate appearance of cold and hot water will seriously affect the comfort of the shower . This is because after the water heater outlet tap is turned off, the high-temperature fins on the heat exchanger are still preheated, and it will be transferred to the relatively low-temperature water that stays in the water heater pipeline, causing the temperature of the water in the pipeline to rise. High, when the faucet is turned on again to use hot water, the high-temperature hot water staying inside the water heater makes it impossible to take a shower, ...

AI Technical Summary

Problems solved by technology

[0006] Although adding a bypass pipe to the gas water heater can produce the above beneficial effects, if the bypass ratio (inner diameter of the bypass pipe / inner diameter of the main pipe of the heat exchanger) is selected too large, it will also have a negative effect on the gas water heater. If the selection is too high, the water temperature inside the heat exchanger will be too high, and the water temperature in the heat exchanger will be too high, which will cause the following negative effects: 1) The increase of the water temperature in the heat exchanger will increase the exhaust gas temperature, resulting in a decrease in the thermal efficiency of the gas water heater

2) If the water temperature in the heat exchanger is too high, it may cause boiling noise. Due to uneven heating, the local water temperature may reach the boiling point, resulting in boiling noise

3) Excessive water temperature in the heat exchanger will increase the number of times the heat exchanger is subjected to cold and heat shocks, which will affect the service life of the heat exchanger

In addition, the gas water heater encounters the phenomenon of sudden cold and hot changes in water temperature caused by fluctuations in water pressure during use. After the water is mixed, the range of water temperature fluctuations will be greatly weakened, reducing the bad experience of hot water users

[0008] Although adding a water storage tank at the water outlet of the gas water heater can produce the above beneficial effects, it will also have adverse effects. 1) When the gas water heater is not in continuous use, the water temperature in the water storage tank is consistent with the temperature of the cold water. When starting the gas water heater , the water in the water storage tank cannot be heated, so it will take longer to produce hot water than a gas water heater without a water storage tank, which is time-consuming and water-consuming, and the user experience is especially uncomfortable in winter; 2), because the water storage tank needs to play a role Mixed water effect, the position of the water inlet is low, the position of the water outlet is high, there is always part of the water in the tank that has not flowed out, and bacteria may breed after a long time; 3) The volume of the water storage tank is large and takes up more space. Its requirements are similar to those of gas water heaters. Like other pipelines, it needs to bear the pressure of 1.5MPa, which requires higher production process of the water storage tank

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