Heat pump water heater

Abstract

The invention relates to a heat pump type water heater comprising a compressor, a condensing heat exchanger, a regenerative heat exchanger and an expansion valve which are connected by pipeline in series at a time, wherein an evaporating heat exchanger outputs to and then returns to the regenerative heat exchanger, and the regenerative heat exchanger outputs to and then returns to the compressor. A water inlet and a water outlet are connected to the condensing heat exchanger. Water flows in from the condensing heat exchanger and flows out from a water outlet after heat exchange. Water flowing out of the condensing heat exchanger flows into a water inlet of the compressor casing heat exchanger disposed on the compressor casing. Water flows out of the water outlet of the compressor casing heat exchanger after the second heat exchange. The high temperature cold medium changes heat with the low temperature cold medium in the regenerative heat exchanger. The invention is provided with the advantages that water in the compressor is cooled by using water of the system itself, overheat of the compressor is reduced, thereby prolonging the service life of the compressor, improving heat exchange efficiency of the condenser, enhancing overload resisting capacity, and further enhancing work ability of the compressor for enhancing hot water temperature.

Description

technical field [0001] The invention relates to a water heater, in particular to a water heater which uses a heat pump to heat water. Background technique [0002] Heat pump water heaters use the principle of heat pumps to produce hot water, which has the advantages of high efficiency and energy saving. In foreign countries, carbon dioxide is used as the working medium, and carbon dioxide-specific compressors are used to make heat pump water heaters. Although this kind of water heater has excellent performance, it is expensive and requires high technical requirements. There is still a big gap in the production level of supporting and complete machine processing. [0003] At present, the existing domestic heat pump water heaters and air conditioners work similarly, using conventional compressors and refrigerants (such as R22, the most commonly used), which mainly have the following shortcomings and problems. [0004] 1. The water temperature is not high. Limited by the per...

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Problems solved by technology

[0005] 2. Frequent overheating shutdown in summer

In the summer when the ambient temperature is high, even if the water temperature is far from 55 degrees, the heat pump system has overheated and shut down, and cannot heat normally

[0006] 3. Poor heating performance and low water temperature in winter

At this time, the heat pump system not only does not save energy but consumes energy, and it is difficult to continue to increase the water temperature.

[0007] 4. The life of the heat pump system is short

[0013] Because the existing heat pump water heater inherits the natural cooling method of the air conditioner compressor, but due to the high system pressure, the compressor generates a lot of heat, and frequent overheating shutdowns will occur in summer when the ambient temperature is high; due to the reliance on natural cooling, the heat dissipation of the compressor The performance is not good. In the process of increasing the system pressure to obtain higher water temperature, the system’s anti-overload ability is weak. When the water temperature is forced to rise to 60 degrees, the heat pump system has overheated and shut down, and cannot obtain higher water temperature; The service life of the compressor is shortened due to the overload and no good cooling for a long time; the natural cooling compressor cannot realize the heat preservation of the compressor at the same time. Low, even the heating coefficient of performance (COP) is less than 1.0

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