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Defrosting method of multi-split air conditioning system and multi-split air conditioning system

A multi-connected system and air-conditioning technology, applied in refrigerators, mechanical equipment, high-efficiency adjustment technology, etc., can solve problems such as poor defrosting effect, long defrosting time, inconsistent wind speed field of outdoor heat exchanger, etc., to avoid heat exchange Dead angle, rapid defrosting effect

Active Publication Date: 2016-04-20
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of this method is that due to the large area of ​​the outdoor heat exchanger in the multi-connected system, the inconsistent wind speed field of the outdoor heat exchanger (the wind speed is high in some areas, and the wind speed is low in some areas), and the uneven distribution of refrigerant flow in each branch of the outdoor heat exchanger will cause problems. It takes a long time for defrosting, and the low flow rate dead zone in some areas will lead to unclean defrosting and poor defrosting effect

Method used

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  • Defrosting method of multi-split air conditioning system and multi-split air conditioning system

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Embodiment 1

[0031] The preferred embodiment discloses a defrosting method for an air conditioner multi-connected system. In this defrosting method, the heating mode is changed to the cooling mode through the reversing of the four-way valve 4, so that the flow speed of the refrigerant in the outdoor heat exchanger 5 and at least part of the pipelines is uneven, resulting in alternating high-speed flow and low-speed flow.

[0032] By changing the flow rate of the refrigerant so that it alternates between high-speed flow and low-speed flow, the disturbance and fluctuation of the high-temperature and high-pressure gaseous refrigerant in the outdoor heat exchanger 5 is strengthened, and the dead angle of the refrigerant in the outdoor heat exchanger 5 is avoided, thereby strengthening the outdoor unit of the multi-connected system defrosting effect.

[0033] The specific steps of the defrosting method are not limited, as long as the flow rate of the refrigerant can fluctuate. Preferably, the ...

Embodiment 2

[0045] The preferred embodiment discloses a defrosting method for an air-conditioning multi-connection system and the air-conditioning multi-connection system for realizing the defrosting method. Such as figure 2 As shown, the multi-line air conditioner system used to implement the defrosting method includes a compressor 1 connected through pipelines, an oil separator 2, a four-way valve 4, an outdoor heat exchanger 5, a flow rate control device 11, and an indoor electronic expansion valve 8. Indoor heat exchanger 9 and gas-liquid separator 10. The flow rate control device 11 is in signal communication with the control device.

[0046] The specific structure of the flow rate control device 11 is not limited, as long as it can adjust the flow rate of the refrigerant in the pipeline between the outdoor heat exchanger 5 and the indoor electronic expansion valve 8 . Correspondingly, the details of the defrosting method are slightly changed:

[0047] Step S3, the high-pressure ...

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Abstract

The invention discloses a defrosting method of a multi-split air conditioning system and the multi-split air conditioning system, belongs to the field of air conditioning devices and defrosting methods thereof, and aims to solve such problems as incomplete defrosting of a traditional device. The defrosting method of the multi-split air conditioning system has the step of changing a heating mode to a refrigerating mode through reversing of a four-way valve, so that the flowing speeds of a refrigerant in an outdoor heat exchanger and at least one part of pipelines are nonuniform, and the alternation of high-speed flowing and low-speed flowing is generated. The multi-split air conditioning system is provided with a flowing speed control device on a pipeline between the outdoor heat exchanger and an indoor electronic expansion valve; and the flowing speed control device is communicated to a control device through signals. The defrosting method of the multi-split air conditioning system and the multi-split air conditioning system use alternation between high-speed flowing and low-speed flowing of the refrigerant for fully melting frost on the outdoor heat exchanger to prevent generation of heat exchange dead angles, so that the defrosting is faster and more thorough.

Description

technical field [0001] The invention relates to the field of air-conditioning devices and defrosting methods thereof, in particular to a defrosting method for an air-conditioning multi-connection system and an air-conditioning multi-connection system for realizing the defrosting method. Background technique [0002] When the air conditioner multi-split system is in heating operation, frost will form on the surface of the outdoor heat exchanger due to the low outdoor temperature. Frosting will lead to deterioration of the heat transfer effect, and the heating capacity of the multi-split system will decline as the frost layer thickens. [0003] At present, the main defrosting method is to use four-way valve reversing, and the multi-connected system changes from a heating cycle to a refrigeration cycle, that is, the outdoor unit heat exchanger becomes a condenser. At this time, the high-temperature and high-pressure gas flowing through the outdoor heat exchanger can quickly mel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B47/02F25B41/04F25B41/06F25B49/02F25B41/20F25B41/34
CPCF25B47/02F25B49/02F25B2500/09F25B2347/021F25B41/20F25B41/31Y02B30/70
Inventor 许浩代文杰张仕强包本勇李卫国
Owner GREE ELECTRIC APPLIANCES INC
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