Multi-split air conditioning device and system, method for refrigerating and heating and control method for system

Abstract

The invention provides a multi-split air conditioning device and system, method for refrigerating and heating by using the device and a control method for the system. The multi-split air conditioning device comprises a compressor, an outdoor heat exchanger, an indoor heat exchanger, a main refrigerant line, a branch refrigerant line and a multi-interface control valve, wherein the outdoor heat exchanger and the indoor heat exchanger are communicated with the compressor; the main refrigerant line is communicated with the outdoor heat exchanger and the indoor heat exchanger and penetrates through a supercooler; one end of the branch refrigerant line is communicated with the main refrigerant line located between the supercooler and the outdoor heat exchanger, the other end of the branch refrigerant line is communicated with the compressor, and the branch refrigerant line penetrates through the supercooler; and the multi-interface control valve is arranged on the branch refrigerant line and is used for controlling the reverse flow of a refrigerant in the main refrigerant line and the branch refrigerant line in the supercooler. According to the multi-split air conditioning device, the reverse flow of the refrigerant in the supercooler is realized by virtue of the branch refrigerant line and the multi-interface control valve, furthermore, a relatively high temperature difference is achieved in both a heating process and a refrigerating process, and the aim of increasing the refrigerating and heating efficiencies by using the same device is achieved.

Description

technical field [0001] The invention relates to the field of refrigeration and heating equipment, in particular to a multi-connected device and system, a method for using the device to perform refrigeration and heating, and a control method for the system. Background technique [0002] At this stage, multi-connected products and their energy-saving and efficiency-enhancing technologies can be said to be changing with each passing day. In every period and every stage, multi-connected products will make great progress. Especially with the gradual use of high-efficiency variable frequency air jet enthalpy increasing compressors, another round of technological innovation has also arrived. [0003] At present, many domestic air-conditioning manufacturers still use subcoolers to increase the subcooling degree of the system under refrigeration conditions, thereby increasing the refrigeration performance coefficient EER. On the premise that the enthalpy injection compressor (EVI c...

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a multi-connected device and system, a method for using the device to perform refrigeration and heating, and a control method for the system, so as to solve the problem that the multi-connected system in the prior art cannot simultaneously improve the efficiency of cooling and heating

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