A method, system and air conditioner for multi-connected oil return control
A technology of oil return control and control method, applied in refrigerators, compressors, refrigeration components, etc., can solve problems such as compressor damage and failure to return oil.
Active Publication Date: 2020-04-21
NINGBO AUX ELECTRIC
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Problems solved by technology
[0005] The problem solved by the present invention is that when the electronic expansion valves of the internal units that have been turned on and not turned on in the multi-connected air conditioner perform the same oil return operation, if the electronic expansion valve is opened too much, it is easy to cause the liquid refrigerant to also return to compression synchronously. machine, causing the compressor to be damaged due to liquid compression; if the opening degree of the electronic expansion valve is too small, the effect of oil return will not be achieved
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[0083] In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0084] combine figure 1 As shown, this embodiment provides a multi-line oil return control method, the multi-line includes at least one first internal unit in the power-on state and at least one second internal machine in the standby state, including the following steps:
[0085] Step S100, obtaining the operating parameters of the compressor;
[0086] Step S200, judging whether the compressor satisfies a first preset condition according to the operating parameters of the compressor;
[0087] Step S300, if yes, control the electronic expansion valve of the first internal unit to operate at a first opening degree, and the electronic expansion valve of the second internal unit to operate at a second opening degree; wherein, the first openin...
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The invention provides a multi-split air conditioner oil return control method and system and an air conditioner. The multi-split air conditioner comprises at least one first indoor unit which is in astarting state and at least one second indoor unit which is in a standby state. The multi-split air conditioner oil return control method comprises the following steps that S100, operation parametersof a compressor are acquired; S200, whether the compressor meets a first preset condition or not is judged according to the operation parameters of the compressor; and S300, if so, electronic expansion valves of the first indoor units are controlled to operate at a first opening degree, and electronic expansion valves of the second indoor units are controlled to operate at a second opening degree, wherein the first opening degree is larger than the second opening degree. According to the multi-split air conditioner oil return control method, the operation parameters of the compressor are monitored, the electronic expansion valves of the started indoor units and the electronic expansion valves of the indoor units which are not started are controlled in a distinguished mode, so that the situations that a liquid refrigerant returns to the compressor in the oil return process of the indoor units which are not started, and then the compressor is damaged due to liquid return are avoided, and the reliability of the unit operation is effectively guaranteed.
Description
technical field [0001] The present invention relates to the technical field of air conditioning, in particular to a multi-line oil return control method, system and air conditioner. Background technique [0002] With the continuous improvement of people's living standards, one-to-many multi-connected air conditioners have been widely used. [0003] At present, for a multi-connected multi-connected air conditioner, the number of indoor units is more than one, and usually there are indoor units that are powered on and not powered on at the same time. The reliability of the multi-line is mainly related to the oil return of the compressor, and the electronic expansion valve plays a key role in the oil return process of the compressor. When the same oil return operation is performed on the electronic expansion valve of the internal unit that is turned on and not turned on, if the electronic expansion valve is opened too much during the oil return process, it is easy to cause liq...
Claims
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IPC IPC(8): F25B31/00F25B49/02
CPCF25B31/004F25B49/02F25B2600/2513
Inventor 侯丽峰秦宪赵攀汪云强
Owner NINGBO AUX ELECTRIC