Gas water heater and control method

Abstract

The invention discloses a gas water heater. The gas water heater comprises a heat exchanger, a water mixing device, a circulating pipe, a water feeding pipe and a controller, wherein the water mixing device is connected to a water draining end of the heat exchanger; the circulating pipe is connected between a water outlet of the water mixing device and a water feeding end of the heat exchanger; and the water feeding pipe is connected to the water feeding end of the heat exchanger. The gas water heater is characterized in that the water feeding pipe is provided with a water proportional valve and a fed water temperature sensor; a detecting temperature sensor is arranged at the water draining end of the heat exchanger; and the water proportional valve, the fed water temperature sensor and the detecting temperature sensor are connected with the controller. When the gas water heater is used, overshoot heating control is facilitated, water flow in a heating process is controlled by the water proportional valve, so that the amount of fed cold water is small in a heating starting process, water can be heated to suitable temperature in a short time, water temperature fluctuation in a heating process is reduced obviously under the effect of the water mixing device, and showering comfort level is improved. The invention also provides a control method.

Description

technical field [0001] The invention relates to fluid heating equipment and control technology, in particular to a gas water heater and a control method. Background technique [0002] A large amount of cold water will flow out when the existing gas water heater is started for the second time, which not only affects the comfort of bathing, but also wastes water, gas, electricity and other resources. In order to solve this problem, someone in the industry proposes a water heater with a water mixing device and a circulation pump. [0003] For example, a Chinese patent with the application number 200410024980.5 discloses a volumetric gas instant water heater, comprising: a closed water storage tank, an expansion tank, a flue pipe, an instant water heater, a combustion chamber, a blower fan, a water pump, a safety burner control valve, Check valve, controller, casing, hot and cold water pipes, gas pipes and other components. Though this patent can put an end to the waste of the...

AI Technical Summary

Problems solved by technology

However, limited by the structure of the water storage tank itself, when the temperature difference between the inlet water temperature and the set outlet water temperature is large, the water temperature at the outlet end of the water heater will fluctuate more significantly during the second start-up process of the water heater, and the heating time is relatively long, which seriously affects bathing. comfort

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