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Oil-balancing control of combined air conditioners

A technology of a multi-connected air conditioner and a control method, which is applied in the field of air conditioners, can solve the problems of oil equalization failure, waste of electric energy, and decline in the capacity of outdoor units, and achieves the effects of saving energy consumption, optimizing operating performance, and improving service life.

Inactive Publication Date: 2007-04-04
HAIER GRP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] 1. When the unit enters oil equalization during normal operation, the sub-unit needs to stop to increase the pressure in its own oil chamber, which will inevitably lead to a significant decline in the capacity of the outdoor unit, thus affecting the user's use effect;
[0007] 2. If the cooling (heating) load of the indoor unit meets the requirements, oil equalization is performed, the main engine needs to increase the operating frequency to reduce the pressure in the oil chamber, and the sub-units that are not running need to be started to reduce the pressure in the oil chamber, which will affect the electric energy. Cause unnecessary waste and increase the user's operating costs;
[0008] 3. When the ambient temperature is very low for heating, it is difficult to achieve the best oil equalization pressure difference by adjusting the operating frequency or capacity of the compressor, which will easily lead to oil equalization failure, which will cause damage to the compressor or reduce the service life

Method used

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  • Oil-balancing control of combined air conditioners
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Embodiment Construction

[0030] The basic principles of the present invention and the traditional multi-line system oil balance mode are the same, and the pressure difference between the oil chambers promotes the directional flow of the refrigerating oil to achieve oil balance.

[0031] The specific process and principle of the mode of realizing oil balance in the present invention are as follows:

[0032] As shown in Figure 1, the control method for the oil balance of the multi-connected air conditioner of the present invention is to connect the main engine 1 outside the multi-connected air conditioner and a group of sub-machines 2 in parallel through the oil equalizing pipe 7, and each compressor oil cavity 8 communicates with the low-pressure suction side , first make each compressor connect an electronic expansion valve 3 in series on the thin tube 5 of the condenser, connect a low-pressure pressure sensor 4 on the suction pipe 6, and then connect the electronic expansion valves 3 in parallel, when...

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Abstract

The invention comprises the following steps: first, connecting in series with an electronic expansion valve on the condenser tubule of each compressor, connecting a low-pressure pressure transducer on the air intake duct and then making the parallel between each electronic expansion valve. When the machine set enters oil-balancing process, the enough differential pressure formed by the pressure between oil cavities of compressors impels the freezing oil to flow directly into the low-pressure compressor to realize the oil balance by regulating the aperture of each electronic expansion valve in the compressor system.

Description

technical field [0001] The invention relates to an air conditioner, in particular to a method for controlling the oil balance of a multi-connected air conditioner capable of adjusting the unbalanced amount of oil between compressors. Background technique [0002] When the multi-line system with parallel compressors is running, due to the difference in the operating status and operating pressure of the compressors, the oil volume between the compressors is often unbalanced. If this unbalanced state is serious, some compressors in the system will be seriously short of oil, which will reduce the service life of the compressor and affect the stability and operating performance of the entire unit. In order to avoid this problem, the multi-line system must adopt an appropriate oil balance method to ensure that the compressors in the unit are always in the best state of oil quantity, to ensure the stability of the unit operation and good use effect. [0003] The basic principle of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B31/00F25B49/02
Inventor 张晓兰毛守博卢大海何建奇
Owner HAIER GRP CORP
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