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A multi-connection system and its control method for preventing compressor liquid return

A multi-online system and control method technology, applied in the direction of compressors, compressors, compressors with reversible cycles, etc., can solve problems such as system performance degradation, impact on user experience, and failures.

Active Publication Date: 2020-10-30
NANJING TICA AIR CONDITIONING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some specific cases, a large amount of liquid refrigerant will be stored in the outdoor unit, which will easily cause the liquid refrigerant to return directly to the compressor, resulting in compressor liquid shock.
Once the liquid hammer phenomenon occurs, the compressor will be damaged immediately, causing serious failure
When a general multi-connected system encounters liquid return from the compressor, it usually prevents compressor liquid shock by closing the electronic expansion valve of the system or reducing the frequency of the compressor, but this will lead to a decrease in system performance and affect user experience.

Method used

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  • A multi-connection system and its control method for preventing compressor liquid return
  • A multi-connection system and its control method for preventing compressor liquid return

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] Such as figure 1 shown.

[0024] A multi-line system for preventing compressor liquid return, including a compressor 1, an oil separator 2, a four-way valve 3, an indoor unit heat exchanger 8, an economizer 6, a heating electronic expansion valve assembly 5, and an outdoor unit The refrigerant circulation circuit composed of the heat exchanger 4 and the gas-liquid separator 9. Wherein, there are multiple indoor unit heat exchangers 8, and each indoor unit heat exchanger is respectively provided with an indoor unit electronic expansion valve 7 so as to perform heating operation efficiently. The evaporation side inlet of the economizer 6 is connected to the bottom of the gas-liquid separator 9 through a liquid outlet pipe 15, so that the liquid refrigerant in the gas-liquid separator 9 can be introduced into the economizer 6; the liquid outlet pi...

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Abstract

The invention relates to a multi-line system for preventing compressor liquid return and its control method, which mainly includes a compressor, an oil separator, a four-way valve, an indoor unit heat exchanger, an economizer, a heating electronic expansion valve assembly, an outdoor A refrigerant circulation circuit composed of a heat exchanger and a gas-liquid separator, the inlet of the evaporation side of the economizer is connected to the bottom of the gas-liquid separator through a liquid outlet pipe, so that the liquid refrigerant in the gas-liquid separator can be introduced into the Economizer described above to prevent compressor liquid flooding. The control method of this system includes: comparing the inlet temperature of the compressor with the saturation temperature, deciding whether to open the liquid return control electronic expansion valve, and then adjusting the opening degree of the liquid return control electronic expansion valve by comparing the temperature at the inlet and outlet of the economizer, For safe and efficient operation.

Description

technical field [0001] The invention relates to an air conditioning system, in particular to a multi-connection system capable of preventing liquid return from a compressor, in particular to a multi-connection system capable of preventing liquid return from a compressor and a control method thereof. Background technique [0002] The multi-connected air conditioning system has the characteristics of long refrigerant pipes, so the amount of refrigerant in the entire system is relatively large. In some specific cases, a large amount of liquid refrigerant will be stored in the outdoor unit, which can easily cause the liquid refrigerant to return directly to the compressor, resulting in compressor liquid shock. Once the liquid hammer phenomenon occurs, the compressor will be damaged immediately, causing serious failure. When a general multi-connected system encounters liquid return from the compressor, it usually prevents compressor liquid shock by closing the electronic expansi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B13/00F25B31/00F25B41/06F25B49/02F25B41/34
CPCF25B13/00F25B31/00F25B49/02F25B41/31Y02B30/70
Inventor 陈昌瑞杨亚华杨兵
Owner NANJING TICA AIR CONDITIONING CO LTD
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