Oil return control method and device for multi-line system, and computer storage medium

A multi-line system and oil return control technology, which is applied in refrigeration and liquefaction, refrigerators, compressors, etc., can solve the problem of large limitations in compressor oil return

Active Publication Date: 2020-03-24
QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides an oil return control method and device for a multi-line system, and a computer storage medium, which are used to solve the problem that the existing oil return design method has large limitations when controlling the oil return of a compressor in a multi-line system

Method used

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  • Oil return control method and device for multi-line system, and computer storage medium
  • Oil return control method and device for multi-line system, and computer storage medium

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specific Embodiment 1

[0028] Combined with the above, when the multi-connected system runs in the first function mode, the outdoor unit operates in the cooling mode, and the outdoor heat exchanger acts as a condenser; the indoor units turned on in the multi-connected system all operate the cooling function, that is, the first heat exchanger and the second Both heat exchangers are used as evaporators. Therefore, when the multi-line system is running in the first functional mode, in the oil return control method provided by this embodiment, the oil return process includes adjusting the frequency of the compressor, respectively communicating with the first heat exchanger and the first heat exchanger as the evaporation heat exchanger. The opening degree EVR(n) of the first electronic expansion valve connected to the second heat exchanger, and the opening degree EVI(n) of the second electronic expansion valve. Optionally, the opening of the outdoor electronic expansion valve connected to the outdoor hea...

specific Embodiment 2

[0038] Combined with the above, when the multi-connected system is running in the second function mode, the outdoor unit operates in the cooling mode, and the outdoor heat exchanger acts as a condenser; among the indoor units that are turned on in the multi-connected system, there is an indoor unit that runs the reheating and dehumidifying function, and the second One heat exchanger acts as a condenser and the second heat exchanger acts as an evaporator. Therefore, when the multi-line system is running in the second function mode, in the oil return control method provided by this embodiment, the oil return process includes adjusting the frequency of the compressor and the second heat exchanger connected to the evaporation heat exchanger. The opening degree EVI(n) of the second electronic expansion valve. Optionally, the opening of the outdoor electronic expansion valve connected to the outdoor heat exchanger serving as the condensation heat exchanger is EVO(n)=EVO(n-1).

[00...

specific Embodiment 3

[0045] In combination with the foregoing, when the multi-split system is running in the third function mode, the outdoor unit is running in the heating mode, and the outdoor heat exchanger acts as an evaporator. In this case, the indoor units of the multi-split system can only include indoor units with heating function turned on, the first heat exchanger of which does not work and the second heat exchanger acts as a condenser. At this time, only adjustment is required during the oil return process. The opening degree EVO(n) of the outdoor electronic expansion valve connected as an evaporative heat exchanger. Or, the indoor units only include the indoor units with the heating function and the dehumidification function turned on. For the indoor units with the dehumidification function turned on, the first heat exchanger is used as the evaporator and the second heat exchanger is not working. At this time, the oil return process It is possible to adjust the opening degree EVO(n) o...

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Abstract

The invention provides an oil return control method and device for a multi-line system, and a computer storage medium, which relate to the field of air conditioning and are used to solve the problem that the existing oil return design method has large limitations when controlling the oil return of a compressor in a multi-line system. The oil return control method includes controlling the multi-line system to enter the oil return process when the multi-line system is running in a functional mode. The oil return process includes: adjusting the frequency of the compressor, and adjusting the outdoor electronic expansion valve, the first electronic expansion valve and The opening of the electronic expansion valve connected to the evaporating heat exchanger in the second electronic expansion valve is to increase the amount of oil returned to the compressor; The heat exchanger used as an evaporator in the heat exchanger; when the frequency of the compressor is within the preset range for a preset time, the multi-connected system is controlled to continue to operate in the functional mode.

Description

technical field [0001] The invention relates to the field of air conditioners, in particular to an oil return control method and device for a multi-line system, and a computer storage medium. Background technique [0002] In recent years, the multi-connected system has become an important direction for the development of air conditioners due to its advantages of centralized management of each indoor unit and flexible control. During the operation of the multi-line system, the lubricating oil will be discharged from the compressor together with the refrigerant. The multi-line unit must be able to return oil regularly and reliably, that is, the drained lubricating oil can be returned to the compressor regularly to ensure that the compressor can be lubricated for a long time without damage. [0003] At present, the existing compressor oil return design method generally increases the operating frequency of the compressor regularly to increase the flow rate of the refrigerant in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B31/00F25B49/02
CPCF25B31/004F25B49/02F25B2600/021F25B2600/2513Y02B30/70
Inventor 刘敏顾晓宇杜永朱海滨何明顺孙龙
Owner QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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