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Oil return control method and device and air conditioner

An oil return control and air conditioner technology, which is applied in the field of air conditioners, oil return control methods and devices, can solve the problems of compressor damage, poor oil return effect of the internal unit, and accumulation of lubricating oil.

Active Publication Date: 2019-02-22
NINGBO AUX ELECTRIC +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual engineering, the length of the connecting pipe of some internal units is longer than that of other internal units. If the oil return control is still carried out according to the fixed expansion valve opening, it will easily lead to poor oil return effect of the internal unit and accumulation of lubricating oil. The compressor is damaged due to lack of oil

Method used

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  • Oil return control method and device and air conditioner
  • Oil return control method and device and air conditioner
  • Oil return control method and device and air conditioner

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Embodiment Construction

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

[0038] The oil return control method and device prov...

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Abstract

The invention provides an oil return control method and a device and an air conditioner. When the indoor unit returns oil, the current outlet temperature and the current inlet temperature of the heatexchanger are obtained, the current superheat degree of the indoor unit are calculated according to the current outlet temperature and the current inlet temperature of the heat exchanger, whether theoil return of the indoor unit fails or not is judged according to the current superheat degree of the indoor unit. When the oil return fails, the opening degree of an electronic expansion valve is increased by a preset opening degree on the basis of the current opening degree when oil return is carried out at the next time in the indoor unit. When the number of times of the continuous oil return failure of the indoor unit reaches the preset frequency, the opening degree of the electronic expansion valve is increased according to the current superheat degree of the indoor unit and the preset target superheat degree every preset time when the indoor unit returns oil at the next time, until the oil return of the indoor unit is ended. Therefore, when the oil return of the indoor unit fails, the opening degree of the electronic expansion valve of the indoor unit is adjusted, the oil return effect of the air conditioner and the reliability of the whole machine are improved, and the compressor is prevented from being damaged due to oil shortage.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to an oil return control method, device and air conditioner. Background technique [0002] In the inverter air conditioning system, in order to protect the reliability of the compressor, it is generally necessary to set a special oil return control mode for oil return. Usually, the oil return control of the air conditioner is to set a fixed opening degree for the expansion valve of the internal unit, and at the same time, consider the comfort of the user, and also set a maximum running time. In actual engineering, the length of the connecting pipe of some internal units is longer than that of other internal units. If the oil return control is still carried out according to the fixed expansion valve opening, it will easily lead to poor oil return effect of the internal unit and accumulation of lubricating oil. The compressor is damaged due to lack of oil. Contents of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B31/00F25B49/02
CPCF25B31/004F25B49/02F25B2600/01F25B2600/2513F25B2700/21
Inventor 章秋平黄春刘合心李兆东任小辉
Owner NINGBO AUX ELECTRIC
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