Heat pipe combined type heat exchanger and heat pump system thereof

Abstract

The invention discloses a heat pipe combined type heat exchanger and a heat pump system thereof. The heat pipe combined type heat exchanger comprises a compressor, a four-way valve, an indoor heat exchanger, a plurality of heat pipe combined type heat exchangers distributed in parallel, a throttling device and a stop valve, wherein the compressor, the indoor heat exchanger, the throttling device and the heat pipe combined type heat exchangers form the heat pump system. The heat pipe combined type heat exchangers comprise a common outdoor heat exchanger and a defrosting heat pipe heat exchanger, wherein the defrosting heat pipe heat exchanger comprises a liquid collecting pipe, a supercooling pipe, a U-shaped heat pipe and a stop valve; the U-shaped heat pipe is embedded in the middle of the outdoor heat exchanger, the lower end of the U-shaped heat pipe is communicated with the liquid collecting pipe through the stop valve, and the supercooling pipe is arranged in the liquid collecting pipe; and the outdoor heat exchanger is filled with a gaseous refrigerant, and the defrosting heat pipe heat exchanger is filled with a second refrigerant. By adopting the technical scheme of the invention, the problems of poor heat supply comfort, poor system stability and the like of the existing heat pump are solved; and the system realizes supercooling and defrosting of the heat pipe combined type heat exchangers on the premise of not stopping heat supply, effectively reduces the energy loss of the refrigerants in the outdoor heat exchanger caused by mode switching, and improves the efficiency and the operation safety of the whole heat pump system.

Description

technical field [0001] The invention belongs to the field of heating of civil buildings, and in particular relates to a heat pipe composite heat exchanger and a heat pump system thereof. Background technique [0002] Air source heat pumps are a very effective alternative to promoting clean heating in winter, reducing coal-burning pollution, and improving air quality in northern my country. Heat pumps are widely used because they can cool in summer, provide heat in winter, and are easy to operate. It is acceptable to use a heat pump for cooling in summer, but when heating in winter, especially in low-temperature and high-humidity areas, the frosting of the outdoor heat exchanger of the heat pump is a problem that cannot be ignored. [0003] At present, small household air source heat pumps generally adopt the reverse cycle defrosting method. Through the switching of the four-way reversing valve, the heating is stopped and defrosting and defrosting are realized at the expense...

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a heat pipe compound heat exchanger and its heat pump system to solve the problems of poor heating comfort and poor system stability of existing heat pumps; in the system , when the outdoor heat exchanger 13 is not frosted, the system operates normally; when the outdoor heat exchanger 13 is frosted, the subcooling pipe 15 in the liquid header 14 supercools and heats the second refrigerant, and passes through the control shut-off valve 12 Make it enter the U-shaped heat pipe 16, and perform rotation defrosting for the outdoor heat exchanger 13 that stops running after frosting without stopping the heat supply; this system realizes the supercooling of the heat pipe composite heat exchanger 4 without stopping the heat supply Defrost, and effectively reduce the energy loss of the refrigerant in the outdoor heat exchanger 13 due to mode switching, improving the efficiency and operational safety of the entire heat pump system

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