Oil return control method and oil return control device for air conditioner and air conditioner

Abstract

The invention provides an oil return control method and an oil return control device for an air conditioner and the air conditioner. The oil return control method comprises the steps that the number of times of halt of a compressor for achieving the condition that the air conditioner adjusts the indoor environment temperature to the set temperature in the preset duration is counted; and if it is counted that the number of times of halt of the compressor reaches the set number of times in the preset duration, when the air conditioner adjusts the indoor environment temperature to the set temperature again, the compressor is controlled to operate at the preset frequency, and a throttling part arranged on a refrigerant pipeline in the air conditioner is controlled to be opened by a preset open degree so as to conduct oil return control on the air conditioner. Through the technical scheme, the effect that lubricating oil discharged into the refrigerant pipeline by the compressor can return to the compressor smoothly in time can be ensured, thus the effect that enough lubricating oil exists in the compressor for lubrication is ensured, and the reliability of the compressor and the system stability are improved.

Description

Technical field [0001] The present invention relates to the technical field of air conditioners, and in particular to an oil return control method of an air conditioner, an oil return control device of an air conditioner, and an air conditioner. Background technique [0002] Multi-line air conditioning system is a refrigeration system composed of one or more outdoor units connected in parallel and connected to 2 or more indoor units through piping. It is mainly used in office buildings, apartment hotels, schools, villas, and hospitals. And other places. [0003] In a multi-connected air conditioning system, there are often cases where only one or a few indoor units are turned on for a long time. When the room load design is too large and the room heat preservation effect is good, the indoor unit can easily adjust the temperature in the room to Set the temperature, the outdoor machine will temporarily enter the shutdown state; after a period of time, the indoor temperature changes,...

AI Technical Summary

Problems solved by technology

Due to the frequent startup and shutdown of the outdoor unit, the outdoor unit cannot continue to operate stably, which will cause the pressure difference between the high and low pressure of the compressor to be small, and the lubricating oil cannot return to the compressor in time after being discharged from the compressor, which will cause the compressor Damaged due to lack of lubricating oil inside

[0004] Therefore, how to avoid the frequent startup and shutdown of the outdoor unit and cause the compressor to be damaged due to lack of lubricating oil, and to ensure the reliable operation of the compressor and the stability of the system has become a technical problem to be solved urgently.

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