Water heater

Abstract

The invention provides a water heater. The water heater comprises an air source heat pump heating system and a water storage tank. The air source heat pump heating system comprises a water flow heat exchanger, an air heat exchanger and a working medium flow direction switching device which are connected through a refrigerating working medium pipeline, and moreover the air source heat pump heating system is configured to be used for acquiring a defrosting starting signal and switching the operation condition of the working medium flow direction switching device to be in the condition that the water flow heat exchanger serves as an evaporator and the air heat exchanger serves as a condenser so as to remove frost attached to the air heat exchanger. The water storage tank is connected with a water flow pipeline of the water flow heat exchanger and is configured to be used for supplying water to the water flow heat exchanger in the process of removing the frost on the air heat exchanger so as to carry away the cold energy of the water flow heat exchanger. Accordingly, the defrosting efficiency is improved, and the effect that the water heater still works normally in a cold working environment in winter can be ensured.

Description

technical field [0001] The invention relates to the field of household electrical appliances, in particular to a water heater. Background technique [0002] Hot water is a necessity in people's life. However, traditional water heaters (electric water heaters, gas water heaters) have the disadvantages of high energy consumption, high cost, and serious pollution, while solar water heaters are restricted by meteorological conditions. [0003] In view of the above problems, heat pump water heaters have appeared in the prior art, which use electric energy as power to draw heat from the low-temperature side to heat domestic water for supply to users. [0004] Heat pump water heaters can use air, water, solar energy, geothermal heat, etc. as low-temperature heat sources, among which air source heat pump water heaters have better comprehensive performance and are not restricted by the environment. The air source heat pump water heater in the prior art is mainly composed of a compre...

AI Technical Summary

Problems solved by technology

[0005] The existing air source heat pump water heater uses the refrigerant to circulate between the air heat exchanger and the water flow heat exchanger, and "pumps" the temperature of the air heat exchanger to the water flow heat exchanger to heat the water. However, the air During the heating process of the source heat pump water heater, the temperature of the air heat exchanger is obviously lower than the surrounding temperature. Normal work in cold environment

Images