Refrigerant pipeline system of outdoor unit, air conditioner and cooling control method for the air conditioner

Abstract

The invention discloses an outdoor unit refrigerant pipeline system, an air conditioner and a refrigeration control method for the air conditioner. The outdoor unit refrigerant pipeline system includes a compressor, an outdoor heat exchange device and a first throttling device. The outdoor unit refrigerant The piping system also includes a subcooling heat exchange device and a bypass; the subcooling heat exchange device includes a first heat exchange assembly, a second heat exchange assembly, and a second throttling device; one end of the bypass is connected to the The exhaust port of the compressor is connected, and the other end is connected with the first end of the first heat exchange assembly; the bypass is provided with a first electromagnetic valve. In the present invention, by arranging the subcooling heat exchange device and the bypass, the first solenoid valve on the bypass is opened during low-temperature refrigeration, and the subcooling heat exchange device is directly connected to the exhaust port of the compressor. At this time, the exhaust port The discharged refrigerant directly enters the subcooling heat exchange device, and using the subcooling heat exchange device as a condenser can effectively increase the condensation pressure and ensure the stability of the outdoor unit refrigerant pipeline system.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to an outdoor unit refrigerant pipeline system, an air conditioner and a refrigeration control method for the air conditioner. Background technique [0002] Today, as the concepts of environmental protection and energy saving are increasingly accepted by everyone, many air-conditioning systems, especially large-capacity air-conditioning systems, have begun to use subcooling technology or jet enthalpy increasing technology to improve system capacity and energy efficiency. In these large-capacity air-conditioning systems, the capacity of a single system is usually ten or even dozens of horses. Especially for multi-connected systems, a system can be connected in parallel with modules of the same or different capacities, and there are multiple compressors inside the module. [0003] In these large-capacity air-conditioning systems, it is necessary not only to meet the capacity ...

AI Technical Summary

Problems solved by technology

However, in large-capacity systems, due to the large displacement of the compressor and the limitation of the minimum operating frequency of the compressor, it is impossible to reduce the output of the compressor to a very low level; in addition, some systems can reduce heat transfer by closing part of the condenser area, but it is not enough to increase the condensing pressure of the system under extreme conditions, and the problem of insufficient superheat of the exhaust and return air of the compressor will still occur, which will affect the reliability and comfort of the system

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