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Control method and system for load balance of double compressors and air conditioner

A load-balancing, dual-compressor technology, applied in heating and ventilation control systems, heating and ventilation safety systems, heating methods, etc. Problems such as high operating current to achieve the effect of reducing component damage, reducing wear, and reducing failure

Active Publication Date: 2020-05-05
NINGBO AUX ELECTRIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the large cooling capacity compressors of air conditioners usually use dual compressors or multiple compressors in parallel to achieve high-power refrigeration. When dual compressors are used to work in parallel at the same operating frequency, due to the Influencing factors such as the difference in temperature and the difference in pipeline welding process will lead to load imbalance between the two compressors, and the operating current of the compressor with a higher load will also be too large. It will shorten the life of the compressor, cause the compressor to be worn or even damaged, and the temperature rise of the components of the compressor controller will also be high, thereby increasing the probability of component failure

Method used

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  • Control method and system for load balance of double compressors and air conditioner
  • Control method and system for load balance of double compressors and air conditioner
  • Control method and system for load balance of double compressors and air conditioner

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Experimental program
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Embodiment approach 1

[0024] See attached figure 1 , the first aspect of the present invention provides a kind of control method of dual-compressor load balancing, comprising: when both compressors are in running state, detect the operating current I of the first compressor respectively in real time 1 , the operating current I of the second compressor 2 ;Judging the running current I 1 and I 2 The relationship with the first preset current value; if the operating current I 1 and I 2 Satisfied:|I 1 -I 2 |>The first preset current value and last for the first time t 1 , then adjust the operating frequency f of the first compressor respectively 1 , the operating frequency f of the second compressor 2 , to balance the load between the first compressor and the second compressor.

[0025] Wherein, the value range of the first preset current value is 3A-10A, and the first time t 1 The value range of is 30s~10min.

[0026] Therefore, the present invention detects the current of the dual compress...

Embodiment approach 2

[0028] See attached figure 2 , the method for controlling the load balance of the dual compressors provided in this embodiment basically adopts the same steps as those in Embodiment 1 above.

[0029] Different from Embodiment 1, the detecting and judging step also includes: detecting the system pressure P of the first compressor and the second compressor in real time; if the system pressure P satisfies: P>the second preset pressure value and lasts for a second time t 2 , then further judge the operating current I 1 and I 2 Relationship with the first preset current value.

[0030] Wherein, the value range of the second preset pressure value is 3.5MPa-4MPa, and the second time t 2 The value range of is 30s~30min.

[0031] Therefore, the present invention detects the system pressure of the dual compressors instead of detecting the pressure of each compressor separately. On the one hand, the detection method is simple and effective; on the other hand, the accuracy of judgin...

Embodiment approach 3

[0033] See attached image 3 The method for controlling the load balance of the dual compressors provided in this embodiment basically adopts the same steps as those in the second embodiment above.

[0034] Different from embodiment two, the judging step also includes: judging the operating current I 1 and I 2 The relationship with the third preset current value, the third preset current value is the maximum operating current value, the first if I 1 >The third preset current value and lasts for the third time t 3 , or I 2 >The third preset current value and lasts for the third time t 3 , then further judge the operating current I 1 and I 2 Relationship with the first preset current value.

[0035] Wherein, the third preset current value is 20A-38A, and the third time t 3 30s ~ 30min.

[0036] Since when the system pressure of the dual compressors is relatively high, the operating current of at least one of the corresponding dual compressors will also be relatively large...

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Abstract

The invention relates to a control method and system for load balance of double compressors and an air conditioner. The control method for load balance of the double compressors comprises the steps that the operating current I1 of the first compressor and the operating current I2 of the second compressor are detected in real time; the relation between the operating current I1 and the operating current I2 and a first preset current value is judged; and if the operating current I1 and the operating current I2 meet the formula that |I1-I2| is beyond the first preset current value and the formulalasts for the first time t1, and the operating frequency f1 of the first compressor and the operating frequency f2 of the second compressor are adjusted so that the load between the first compressor and the second compressor can be balanced. According to the control method and system for load balance of the double compressors and the air conditioner, the currents of the double compressors are detected, when the currents of the double compressors are unbalanced, the load between the double compressors is balanced by adjusting the operating frequencies of the double compressors, and therefore abrasion of the compressors is reduced, the service life of the compressors is prolonged, electric stress damage to components is reduced, and the probability of component failure is reduced.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a control method, a control system and an air conditioner for load balancing of dual compressors. Background technique [0002] At present, the large cooling capacity compressors of air conditioners usually use dual compressors or multiple compressors in parallel to achieve high-power refrigeration. When dual compressors are used to work in parallel at the same operating frequency, due to the Influencing factors such as the difference in temperature and the difference in pipeline welding process will lead to load imbalance between the two compressors, and the operating current of the compressor with a higher load will also be too large. It will shorten the life of the compressor, cause the compressor to be worn or even damaged, and at the same time, the temperature rise of the components of the compressor controller will also be high, thereby increasing the probability o...

Claims

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Application Information

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IPC IPC(8): F24F11/30F24F11/64F24F11/86F24F11/88F24F140/12
CPCF24F11/30F24F11/64F24F11/86F24F11/88F24F2140/12
Inventor 陈红李发顺许真鑫黄邵敏
Owner NINGBO AUX ELECTRIC