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Method for controlling electronic expansion valves during multi-connected air conditioning unit heating

An electronic expansion valve and control method technology, applied in the direction of control input related to air characteristics, space heating and ventilation control input, heating mode, etc., can solve the problem of unbalanced heating effect, unreasonable refrigerant distribution, and refrigerant distribution Unevenness and other problems can be achieved to achieve reasonable distribution and balanced heating effect

Active Publication Date: 2016-10-26
NINGBO AUX ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Because the types of indoor units connected to the outdoor unit are different, and the lengths of the connecting pipes between the indoor unit and the outdoor unit are also different, these factors cause the indoor unit to have uneven distribution of refrigerant during heating, resulting in heating failure. unbalanced effect
[0007] The control of the electronic expansion valve in the existing multi-connected mechanism heating is as patent No. 201010001801.1, and the patent name is "A Control and Correction Method for the Expansion Valve of One Drag and Multiple Air Conditioners", which is based on the degree of superheat. When it is too large, correct multiple expansion valves at the same time, so as to ensure that there will be no liquid refrigerant after the refrigerant passes through the outdoor heat exchanger, but there will still be unreasonable refrigerant distribution of each indoor unit, causing the In case of uneven thermal effect

Method used

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  • Method for controlling electronic expansion valves during multi-connected air conditioning unit heating
  • Method for controlling electronic expansion valves during multi-connected air conditioning unit heating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] System setting: when Tao6°C, Tr=2°C; 6°C≤Tl≤10°C.

[0044] For example, if the temperature measured by the ambient temperature sensor of the outdoor unit is 1°C, Tr is 4°C.

[0045] If the actual suction superheat Ts-Tdef=6°C, it is judged that the obtained Ts-Tdef is not equal to Tr.

[0046] Determine whether the actual subcooling degrees of all electronic expansion valves are within the range of 6°C to 10°C, and open all electronic expansion valves (Ts-Tdef)-Tr=6-4=2 steps.

Embodiment 2

[0048] System setting: when Tao6°C, Tr=2°C; 6°C≤Tl≤10°C.

[0049] For example, if the temperature measured by the ambient temperature sensor of the outdoor unit is 1°C, Tr is 4°C.

[0050] If the actual suction superheat Ts-Tdef=3°C, it is judged that the obtained Ts-Tdef is not equal to Tr.

[0051] Determine whether the actual subcooling degree of all electronic expansion valves is between 6°C and 10°C. If two electronic expansion valves are not within this range, the actual subcooling degree of one electronic expansion valve is 4°C, and the other The actual subcooling degree of the valve is 12°C; when closing down the electronic expansion valve whose actual subcooling degree is 4°C, the number of steps for closing down is: Tr-(Ts-Tdef)=4-3=1 step.

Embodiment 3

[0053] System setting: when Tao6°C, Tr=2°C; 6°C≤Tl≤10°C.

[0054] For example, if the temperature measured by the ambient temperature sensor of the outdoor unit is 1°C, Tr is 4°C.

[0055] If the actual suction superheat Ts-Tdef=4°C, it is judged that the obtained Ts-Tdef is equal to Tr.

[0056] Determine whether the actual subcooling degree of all electronic expansion valves is between 6°C and 10°C. If two electronic expansion valves are not within this range, the actual subcooling degree of one electronic expansion valve is 4°C, and the other The actual subcooling degree of the valve is 12°C; when closing down the electronic expansion valve whose actual subcooling degree is 4°C, the number of steps to close is: Tl lower limit - the actual subcooling degree of the electronic expansion valve = 6-4 = 2 steps ; Open the electronic expansion valve whose actual subcooling degree is 12°C, the number of steps to open is: the actual subcooling degree of the electronic expansion val...

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Abstract

The invention discloses a method for controlling an electronic expansion valves during multi-connected air conditioning unit heating. The method includes the following steps that firstly, the target air suction superheat degree Tr and the target supercooling degrees Tl of the expansion valves are set; secondly, whether the actual air suction superheat degree Ts-Tdef is equal to Tr or not is judged, if the actual air suction superheat degree Ts-Tdef is equal to Tr, the third step continues to be executed, and if the actual air suction superheat degree Ts-Tdef is not equal to Tr, the sixth step is executed; thirdly, whether the actual supercooling degrees tem-liq of the expansion valves are all in the Tl range or not is judged, if the actual supercooling degrees tem-liq of the expansion valves are all in the Tl range, the fourth step is executed, if the actual supercooling degrees tem-liq of the expansion valves are not all in the Tl range, the fifth step is executed, no adjustment is made, and the second step is executed; fifthly, when the actual supercooling degree tem-liq of a certain expansion valve is larger than the upper limit of T1, the valve is opened to a certain degree, when the actual supercooling degree tem-liq of a certain expansion valve is smaller than the lower limit of Tl, the valve is closed to a certain degree, and the second step is executed after adjustment is completed; sixthly, whether the actual supercooling degrees tem-liq of the expansion valves are all in the Tl range or not is judged, if the actual supercooling degrees tem-liq of the expansion valves are all in the Tl range, the seventh step continues to be executed, and if the actual supercooling degrees tem-liq of the expansion valves are not all in the Tl range, the eighth step is executed; seventhly, the step numbers of all the expansion valves are adjusted, and the second step is executed after adjustment is completed; and eighthly, when Ts-Tdef is larger than Tr, the expansion valves with tem-liq larger than the upper limit of Tl are opened to a certain degree, if Ts-Tdef is smaller than Tr, the expansion valves with tem-liq smaller than the lower limit of Tl are closed to a certain degree, and the second step is executed after adjustment. The method has the beneficial effects that a refrigerant is reasonably distributed, and a balance heating effect is achieved.

Description

technical field [0001] The invention relates to the field of multi-connected air conditioners, in particular to a method for controlling an electronic expansion valve during multi-connected heating. Background technique [0002] Existing multi-connected air-conditioning units are referred to as multi-connected units for short. Among them, the structure of household multi-connected units is relatively simple. There is only one outdoor unit and multiple indoor units, and the multiple indoor units are connected in parallel. [0003] The household multi-split unit includes a variable frequency compressor, a four-way reversing valve, an outdoor heat exchanger, multiple indoor heat exchangers, and multiple electronic expansion valves. The number of electronic expansion valves is the same as the number of indoor heat exchangers, and they are connected one to one. The outlet of the compressor is connected to the first valve port of the four-way reversing valve, the second valve por...

Claims

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Application Information

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IPC IPC(8): F25B41/06F25B41/04F25B49/02F24F11/00F24F11/02F25B41/34
CPCF24F11/30F24F11/83F24F11/89F24F2110/00F24F2110/10F25B49/02F24F2110/12F24F11/84F25B2600/2513F25B2313/0233F25B2313/0292F25B2313/0315F25B2313/02741F25B41/20F25B41/31Y02B30/70
Inventor 侯丽峰赵攀
Owner NINGBO AUX ELECTRIC
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