Air-conditioning system, refrigeration auxiliary device and control method thereof

Abstract

The present invention proposes an air conditioning system and its refrigeration auxiliary device and control method. The air conditioning system includes an outdoor unit and at least one indoor unit. The outdoor unit is connected to each indoor unit through a liquid pipe, a low-pressure air pipe and a high-pressure air pipe. machine, the refrigeration auxiliary device includes: the first four-way valve, the first end of the first four-way valve is connected to the high-pressure air pipe, and the third end of the first four-way valve is connected to the air return port of the compressor; one-way control branch, one-way The control branch is connected between the second end of the first four-way valve and the low-pressure air pipe; the throttling branch is connected between the fourth end of the first four-way valve and the low-pressure air pipe, so that, on the one hand It can ensure the reliability of the compressor during low-temperature refrigeration operation, realize reliable refrigeration operation under low-temperature environment, and on the other hand, ensure the comfort of indoor air outlet temperature during low-temperature refrigeration operation.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to an air conditioning system, a refrigeration auxiliary device and a control method thereof. Background technique [0002] At present, the application range of air-conditioning systems is becoming more and more extensive. In some special areas or special workplaces, it is necessary to perform refrigeration in an outdoor low-temperature environment, that is, the air-conditioning system needs to be cooled when the outdoor temperature is lower than the predetermined temperature (for example: below 15°C) (time) cooling operation, such as data room, conference room, etc., need low-temperature cooling in winter. At this time, if the air conditioning system continues to cool in accordance with the normal refrigeration method, liquid refrigerant will flow into the compressor, causing damage to the compressor and freezing the indoor heat exchanger. [0003] In the related technolo...

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Problems solved by technology

[0004] However, the problem with the related technology is that when the outdoor fan runs at a low speed, the operating frequency of the compressor will also be reduced, which will result in a relatively low superheat of the compressor. Opportunity reports that the compressor has insufficient superheat, which will eventually cause the compressor to shut down, resulting in poor cooling capacity and reliability of the system, as well as large fluctuations in indoor temperature and poor comfort

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