Control method for pressurization function of gas water heater, and gas water heater

Abstract

The invention discloses a control method for a pressurization function of a gas water heater, and the gas water heater. The control method comprises the following steps: S1, starting the pressurization function; S2, judging whether a water flow detected by a water flow sensor is greater than or equal to a startup water flow or not, if so, carrying out ignition for startup, and starting a water pump; or else, returning to the step S1; S3, judging whether the water flow is less than a shutdown water flow or not according to the water flow detected by the water flow sensor in real time, and if so, shutting down and extinguishing, and turning off the water pump; or else, entering step S4; S4, detecting a water inlet temperature in real time according to a temperature probe, judging whether water inlet temperature rise in unit time is greater than a pump turn-off temperature difference DeltaT(pump turn-off) or not, and if not, maintaining the operation of the pressurization function, and returning to the step S3; or else, turning off the water pump, and entering step S5; and S5, judging whether the water flow detected by the water flow sensor is less than the shutdown water flow or not,and if so, shutting down and extinguishing; or else, starting the water pump again.

Description

technical field [0001] The invention relates to the technical field of gas water heater pressurization control, in particular to a method for controlling the pressurization function of a gas water heater and a gas water heater. Background technique [0002] At present, zero-cold water gas water heaters have become the trend of the water heater industry because they can realize instant hot water. However, most zero-cold water water heaters on the market do not have the function of water volume boosting. The specific reasons are as follows: [0003] The control logic of the supercharging function of conventional supercharging gas water heaters on the market is as follows. The pump-on condition: after the supercharging function is turned on, when the water flow measured by the water flow sensor of the water heater is greater than the water flow when the pump is turned on (about 2.5L / min), That is, the water pump is turned on for pressurization. Pump off condition: In the boost...

AI Technical Summary

Problems solved by technology

When the user turns off the hot water tap, the water stored in the pipeline circulates under the action of the water pump. There may be a phenomenon that the circulating flow rate (generally 3.5-5L / min) is higher than the water flow rate when the water heater is turned off. Continue to heat the stored water until the outlet water temperature reaches high temperature protection. Temperature (about 75 ℃) to turn off the fire and turn off the pump, wasting a lot of gas and electricity; when the user turns on the hot water faucet again, the water temperature is too hot, which can easily cause burns

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