Air source heat pump water heater

Abstract

The invention discloses an air source heat pump water heater which comprises a refrigerating loop, a hot water loop and a controller, wherein an exhaust port of a compressor is connected with a main pipe orifice D of a four-way valve, and is connected with a liquid inlet hole of a heat exchanger through a valve pipe orifice C; a liquid outlet hole of the heat exchanger is connected with an inlet of an evaporator through a throttling device; an outlet of the evaporator is connected with a pipe orifice E of the four-way valve, and is connected with a suction hole of the compressor through a valve hole S; the air source heat pump water heater is characterized in that the compressor is a variable frequency compressor; an auxiliary cooling pipeline is connected between an air suction pipeline of the compressor and a liquid outlet of the heat exchanger; the pipeline is formed by connecting an electromagnetic valve and a liquid spray capillary tube; an exhaust pipeline of the compressor is provided with a row of temperature sensors; and the row of temperature sensors are used for measuring the temperature for controlling the electromagnetic valve to be opened and closed. By adopting the variable frequency compressor and being matched with the auxiliary cooling pipeline, the air source heat pump water heater leads the compressor to work normally in the environment with low temperature, ensures the hot water supply to be stabler, and has wider application scope.

Description

technical field [0001] The invention relates to a water heater, in particular to an air source heat pump water heater. Background technique [0002] At present, water heaters are generally divided into fuel gas water heaters, electric heating water heaters, solar water heaters, and air source heat pump water heaters. Fuel gas water heaters are water heaters that heat water by burning mineral or organic fuels such as liquefied petroleum gas, natural gas, kerosene, and alcohol. , this type of water heater is easily affected by factors such as fuel combustion degree and water pressure fluctuations, resulting in large fluctuations in water temperature, and in the case of insufficient oxygen supply, it is easy to produce toxic gases such as carbon monoxide, which is very harmful to the human body. Sometimes it may lead to poisoning incidents, more importantly, it needs to consume a lot of non-renewable resources, the cost of use is high, and the impact on the environment is relat...

AI Technical Summary

Problems solved by technology

[0005] ① It cannot be adapted to operate under wide load conditions. Since the fixed-frequency air source water heater controls the opening of the compressor through the temperature difference between the inlet and outlet water or the water temperature difference in the water tank, it is easy to cause frequent compressors when the external water demand is small. Start and stop, which will not only increase the energy consumption of the system, but also affect the service life of the compressor

In the case of a large external water demand, although the fixed-frequency compressor works continuously, the water temperature cannot be raised rapidly due to the capacity limitation of the compressor;

[0006] ② Stable operation in a wide temperature range cannot be achieved. When the ambient temperature is low, it is difficult for the fixed-frequency heat pump water heater to start normally, and it is easy to cause the exhaust temperature to be too high and shut down. When the ambient temperature is high, the fixed-frequency heat pump The water heater is easy to cause the exhaust temperature and exhaust pressure to be too high and shut down;

[0007] ③ Ordinary fixed-frequency compressors use asynchronous induction motors, which have iron losses, so the conversion efficiency is relatively low. At the same time, the starting current of fixed-frequency compressors is relatively large, which has a great impact on the power grid and will affect the normal operation of other electrical appliances that are running. use;

Studies have shown that when the ambient temperature is -20°C, the heating capacity can only reach about 20%-30% of the rated working condition, and due to the continuous expansion of the operating temperature difference, the efficiency of the heat pump water heater is also getting lower and lower, so that not only the heating capacity cannot meet user requirements, and loses its high-efficiency superiority

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