Defrosting system for heat pump

Abstract

The invention discloses a defrosting system for a heat pump, which comprises a compressor, a four-way valve, a gas-liquid separator, an outdoor heat exchanger, a thermostatic expansion valve, an indoor heat exchanger and a two-way magnetic valve which are connected through pipes as below: the compressor is connected with the port D of the four-way valve; the port C of the four-way valve is connected with the outdoor heat exchanger and one end of the two-way magnetic valve; the other end of the two-way magnetic valve is connected with the outdoor heat exchanger and the indoor heat exchanger; two ends of the thermostatic expansion valve are connected with the outdoor heat exchanger and the indoor heat exchanger in a one-to-one correspondence manner; the outdoor heat exchanger is connected with the port E of the four-way valve; the port S of the four-way valve is connected with one end of the gas-liquid separator; and the other end of the gas-liquid separator is connected with the compressor. The defrosting system for the heat pump has the characteristic of being less susceptible to frosting in winter heating.

Description

technical field [0001] The invention belongs to a heat pump system, in particular to a heat pump defrosting system, which is suitable for domestic heating and cooling, domestic hot water, air conditioning and other fields. Background technique [0002] Heat pump technology is a new energy technology that has attracted much attention in the world in recent years. In today's era of advocating environmental protection and energy saving, energy-efficient and environmentally friendly domestic heating or cooling systems, domestic hot water systems, and air conditioners designed and developed using heat pump technology are becoming more and more popular. Attracting people's attention, the heat pump technology uses the reverse Carnot cycle principle, uses the refrigerant as the medium, and passes through the cycle of the gas phase change of the refrigerant in the evaporator, compressor, condenser and expansion valve, that is, the refrigerant boils and The cycle of condensation reali...

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Problems solved by technology

[0003] However, when the outdoor temperature of the heat pump system is low in winter, it is easy to frost, and the defrosting is endless.

In particular, the bottom of the outdoor heat exchanger is the easiest to accumulate frost and form frost. If it is not defrosted in time, it will affect the production of domestic heating and hot water, and will also adversely affect the performance of the heat pump system, increasing energy consumption; Downtime occurs in severe cases

The above reasons limit the popularization and application of heat pump systems

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