Heat pump circulating system with combined defrosting function and operation method

A circulating system and heat pump technology, applied in lighting and heating equipment, damage protection, refrigeration components, etc., can solve the problems of increasing the capacity of the vapor-liquid separator and reducing the comfort, and achieve the goal of speeding up the defrosting process and shortening the defrosting time. Effect

Pending Publication Date: 2018-10-19
GREE ELECTRIC APPLIANCES INC
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  • Abstract
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Problems solved by technology

The present invention adopts the composite defrosting mode, which solves the problem of increasing the capacity of the vapor-liquid

Method used

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  • Heat pump circulating system with combined defrosting function and operation method
  • Heat pump circulating system with combined defrosting function and operation method
  • Heat pump circulating system with combined defrosting function and operation method

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Embodiment Construction

[0016] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0017] figure 1 It is a schematic diagram of an existing two-stage compressed air source heat pump circulation system. The system includes: a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a first expansion valve 4, a flash evaporator 5, a second expansion valve 6, an indoor heat exchanger 7 and a vapor-liquid separator, which are sequentially connected by pipelines 8. The compressor adopts a two-stage compressor. The flash evaporator has 3 ports, one inlet and two outlets. The upper end of the flash evaporator leads to a gas supply pipeline 9 connected with the high-pressure chamber of the compressor and is controlled by the third solenoid valve 10 . The system uses a refrigeration cycle during defrosting, and the system needs to absorb heat from the indoor medium, resulting in reduced comfort, and the indoor heat exchanger will fre...

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Abstract

The invention discloses a heat pump circulating system with a combined defrosting function and an operation method. The heat pump circulating system comprises a compressor, a four-way valve, an indoorheat exchanger and a flash evaporator, wherein an air supplementing pipeline is arranged between the flash evaporator and a compression cavity. A first electromagnetic valve (11) is arranged on a pipeline between the four-way valve (2) and the indoor heat exchanger (7), a branch is led out from the air supplementing pipeline (9), a second electromagnetic valve (13) is arranged on the branch, andthe other end of the branch is converged with an air inlet pipeline of the compressor. A bypass (14) communicating with the flash evaporator (5) is led out from an exhaust pipeline of the compressor,and a third expansion valve (15) is arranged on the bypass. A composite defrosting method combining reverse defrosting and hot air bypass defrosting is adopted, existing equipment of the system is directly used, the size of a vapor-liquid separator does not need to be increased, the defrosting process is accelerated, and the defrosting time is shortened.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a dual-stage compressed air source heat pump circulation system and an operation method for compound defrosting. Background technique [0002] The defrosting problem is a major problem encountered in the application process of the low temperature air source heat pump system. [0003] In conventional technologies, most air source heat pumps use the reverse defrosting method, which needs to absorb heat from the indoor medium, resulting in reduced comfort, or the risk of water medium freezing in the indoor heat exchanger. In the prior art, there is also a hot gas bypass defrosting method. This method mainly introduces the exhaust gas of the compressor directly into the outdoor heat exchanger, and returns to the gas-liquid separator after melting the frost layer. This method requires the gas-liquid separator to have a relatively large capacity. [0004] Therefore, how to s...

Claims

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Application Information

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IPC IPC(8): F25B47/02
CPCF25B47/022F25B47/025F25B2347/02
Inventor 吴一梅陈志杰桂涛
Owner GREE ELECTRIC APPLIANCES INC
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