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Control method for electronic expansion valve of multi-connected unit

A technology of electronic expansion valve and control method, applied in mechanical equipment and other directions, can solve problems such as system liquid return

Active Publication Date: 2022-03-25
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adjustment speed of suction superheat and exhaust superheat has a certain limit. When the load changes sharply, it will still cause the system to return liquid

Method used

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  • Control method for electronic expansion valve of multi-connected unit
  • Control method for electronic expansion valve of multi-connected unit

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Experimental program
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Embodiment Construction

[0040] see in conjunction Figure 1 to Figure 2 As shown, according to the embodiment of the present application, the multi-unit unit applying the control method of the multi-unit unit electronic expansion valve includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an external fan 4, and an external unit electronic expansion valve 5 , Stop valve 6, internal electronic expansion valve 71, 72... 7n, internal heat exchanger 81, 82... 8n, stop valve 9, gas-liquid separator 10, suction temperature sensor 11 and high pressure sensor 12.

[0041] When the multi-unit unit is in heating operation, the low-temperature and low-pressure gas enters the suction port of the compressor 1 from the outlet of the gas-liquid separator 10, is compressed into high-temperature and high-pressure gas in the compressor, and enters the indoor unit 1 through the four-way valve 2. Machine 2...condenses the high-temperature superheated gas into high-temperature and high-pressure liquid ...

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Abstract

The invention provides a control method for an electronic expansion valve of a multi-connected unit. The control method for the electronic expansion valve of the multi-connected unit comprises the steps that the running state of the multi-connected unit is obtained; when the multi-connected unit is in heating operation, detecting whether the number of started indoor units is changed or not; when it is detected that the number of the started indoor units changes, the ratio of the capacity of the started indoor units to the capacity of the total indoor units in the initial running state and the opening degree of an electronic expansion valve of an outdoor unit are obtained; the ratio of the capacity of the started indoor units to the capacity of the total indoor units after the number of the started indoor units changes is obtained; and according to the ratio of the capacity of the started indoor units to the capacity of the total indoor units in the initial operation state, the opening degree of the electronic expansion valves of the outdoor units and the ratio of the capacity of the started indoor units to the capacity of the total indoor units after the number of the started indoor units is changed, the preset opening degree of the electronic expansion valves of the outdoor units after the number of the started indoor units is changed is determined. According to the control method for the multi-connected unit electronic expansion valve, system liquid return can be effectively prevented, and the reliability of system operation is improved.

Description

technical field [0001] The present application relates to the technical field of air conditioning, in particular to a method for controlling electronic expansion valves of multi-connected units. Background technique [0002] During the operation of the multi-unit heating system, the number of indoor units that are turned on will change frequently. When the number of indoor units that are turned on is switched from fully turned on to only one turned on, the system load will decrease at this time. If the speed is slow, it will cause a large amount of liquid return in an instant. When the liquid refrigerant returns to the compressor, it will cause liquid shock. The liquid refrigerant evaporates rapidly in the compressor, which will take away part of the lubricating oil, causing the compressor to lack oil and cause failure. [0003] An air conditioner and a control method for preventing liquid-laden operation of the compressor are disclosed in the related art. The solution cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/30F24F11/64
CPCF24F11/30F24F11/64Y02B30/70
Inventor 王永立杨玉生胡强顾思忠
Owner GREE ELECTRIC APPLIANCES INC
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