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A control method and device for a multi-connected air conditioning system

A multi-connected air conditioner and control method technology, applied in heating and ventilation control systems, heating and ventilation safety systems, heating methods, etc., can solve problems such as compressor frequency drop

Active Publication Date: 2018-01-30
QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Embodiments of the present invention provide a control method and device for a multi-connected air-conditioning system, so as to at least solve the problem of refrigerant in the running indoor unit in a modular multi-connected air-conditioning system, especially in an air-conditioning system without a liquid accumulator. The problem of compressor frequency drop caused by accumulation or shortage increases the compressor frequency and improves the heating capacity of the air conditioning system

Method used

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  • A control method and device for a multi-connected air conditioning system
  • A control method and device for a multi-connected air conditioning system
  • A control method and device for a multi-connected air conditioning system

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Embodiment 1

[0037] An embodiment of the present invention provides a control method for a multi-connected air-conditioning system, specifically as figure 2 shown, including:

[0038] S101. During the detection cycle of the multi-connected air-conditioning system, the control device of the multi-connected air-conditioning system determines the subcooling degree of the heat exchanger in the j-th closed indoor unit in the i-th cycle, i≥1, j≥1, i , j are both integers.

[0039] Specifically, in the embodiment of the present invention, in order to achieve real-time control of the air-conditioning system, a detection cycle can be set, that is, the control device of the multi-connected air-conditioning system is used to detect the heat exchanger in the closed indoor unit every certain detection cycle. The subcooling degree is used to further control the multi-connected air conditioning system.

[0040] Specifically, in the embodiment of the present invention, the degree of subcooling refers t...

Embodiment 2

[0083] An embodiment of the present invention provides a control device 60 for a multi-connected air-conditioning system, specifically as Figure 6 As shown, it includes: a subcooling degree determination unit 601 , an electronic expansion valve opening change acquisition unit 602 , an electronic expansion valve opening acquisition unit 603 , an electronic expansion valve opening storage unit 604 , and an electronic expansion valve opening adjustment unit 605 .

[0084] Wherein, the subcooling degree determination unit 601 is used to determine the subcooling degree of the heat exchanger in the j-th closed indoor unit in the i-th cycle within the detection cycle of the multi-connected air-conditioning system, i≥1, j≥1 , i and j are both integers.

[0085] Electronic expansion valve opening change acquisition unit 602, configured to acquire the electronic expansion of the jth closed indoor unit in the ith cycle according to the subcooling degree of the heat exchanger in the jth ...

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Abstract

Embodiments of the present invention provide a control method and device for a multi-connected air-conditioning system, which can improve the heating capacity of the air-conditioning system. The method includes: determining and storing the subcooling degree of the heat exchanger in the j-th closed indoor unit in the i-th cycle during the detection cycle of the multi-connected air-conditioning system; According to the subcooling degree of the heat exchanger in the i-th cycle, the change value of the electronic expansion valve opening of the j-th closed indoor unit in the i-th cycle is obtained; according to the electronic expansion valve opening of the j-th closed indoor unit in the i-th cycle degree, and the pre-stored opening value of the electronic expansion valve of the j-th closed indoor unit in the i-1th cycle, acquire and store the electronic expansion of the j-th closed indoor unit in the i-th cycle The first opening value of the valve; adjust the opening of the electronic expansion valve of the jth closed indoor unit in the i-th period to the first opening value. The invention is suitable for the technical field of air conditioning.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a control method and device for a multi-connected air conditioning system. Background technique [0002] With the improvement of people's living standards, the requirements for the heating / cooling performance of air conditioners are also getting higher and higher. Typically, an important factor affecting the heating / cooling performance of an air conditioning system is the compressor in the system. [0003] In the prior art, for a modular multi-split system, only some indoor units may run in the system. For the closed indoor unit, since the fan of the heat exchanger in the indoor unit has stopped working, the high-temperature and high-pressure gaseous refrigerant will flow out through the electronic expansion valve placed at the outlet of the heat exchanger after entering the heat exchanger, and continue to circulate in gaseous form. However, since the opening of the el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/64F24F11/84F24F11/62
Inventor 李丛来郭来红杜明龙迟武功
Owner QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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