Heat pump type hot water supply apparatus

Abstract

The invention provides a heat pump type hot water supply apparatus, comprising a cascade circulation unit, comprising: a cascade circulation heat exchanger making a first coolant of a low temperature refrigeration circulation perform heat exchange with a second coolant of a high temperature refrigeration circulation, the water coolant heat exchanger heating water during condensation of the secondcoolant of the high temperature refrigeration circulation is connected with a position requiring heat supply and a water circulating path. The heat pump type hot water supply apparatus comprises a coolant injection path and a gaseous coolant adjustment valve. The coolant injection path may be split between a cascade heat exchanger and an evaporator of a low temperature refrigeration cycle to inject coolant into a low pressure side compressor, or between a water coolant heat exchanger and a cascade heat exchanger to inject coolant into a high pressure side compressor of a high temperature refrigeration cycle. The gaseous coolant adjustment valve may be provided in the coolant injection path and is adjusted to correspond to a load of a destination. Via the above structure, high temperature water can be effectively supplied to places requiring hot water supply, reduction of heating efficiency due to outdoor low temperature in cold zones can also be effectively prevented.

Description

technical field [0001] The present invention relates to a heat pump water supply device, in particular to a heat pump water supply device which utilizes a refrigerant circulation device to heat indoor heated water. Background technique [0002] Generally speaking, a heat pump is a refrigeration and heating device that transfers heat from a low temperature to a high temperature or from a high temperature to a low temperature by using the heat of heat generation or condensation of a refrigerant. [0003] A heat pump includes a compressor, a condenser, an expansion mechanism, and an evaporator. In recent years, in order to minimize the consumption of fossil fuels, heat pump water heaters that use refrigerant to heat water and heat indoor floors have become a trend of development. [0004] However, according to the prior art heat pump water heating device, it cannot be used in areas with low outdoor temperature or low average outdoor temperature, such as cold areas, the heating ...

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Problems solved by technology

[0004] However, according to the prior art heat pump water heater, the heating performance cannot correspond to the outdoor air temperature when the outdoor temperature is low or the average outdoor air temperature is low, for example, when the evaporator freezes at low temperature, There is a problem of not being able to heat or the performance is reduced due to frequent defrosting operations

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