Air conditioning system, controlling method and air conditioner

Abstract

The invention provides an air conditioning system, a controlling method and air conditioner. The air conditioning system comprises a compressor, a condenser and an evaporator, further comprise an oiltank, wherein the oil tank communicates with a gas suction port of the compressor through a balance pipe, the air conditioning system further comprises a primary injection device, the primary injection device comprises a first injector, the first high-pressure injection end of the first injector communicates with the condenser, the first low-pressure injection end communicates with the evaporator,and the first outlet end of the first injector communicates with the oil tank. According to the air conditioning system, the controlling method and the air conditioner, a scheme that oil is directlyinjected to the gas suction port of the compressor is abolished, and the oil is prevented from being directly injected to the gas suction port of the compressor to be taken away by a gas flow, so thatthe condition that the compressor is caused to lack the oil is avoided, normal oil return when the compressor sucks is guaranteed, a secondary injection pipeline is removed, a primary injection pipeline is directly connected with the oil tank, the combination of oil return injection and oil cooling assistance is adopted, the times of oil soaking of the balance pipe can be reduced, and the stressstrain of the long-segment pipeline can be reduced as well.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to an air conditioning system, a control method and an air conditioner. Background technique [0002] At present, after-sales centrifuges often have low oil level abnormalities. One of the main reasons is that when the guide vane opening is large and the impeller suction capacity is strong, the purified oil in the first-stage ejection cannot remain in the suction port. , directly taken away by the airflow, which will lead to lack of oil for a long time. The second is because when the liquid level in the fuel tank is high, the vaporization of the refrigerant will bring part of the oil from the balance pipe to the system, resulting in oil leakage. [0003] The common ejection oil return of centrifuge is divided into primary ejection oil return and secondary ejection oil return. The first-stage injection oil return is to draw high-pressure gaseous refrigerant fro...

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the existence of the secondary injection oil return system of the air conditioner in the prior art. In the case of a high-load impeller with a strong suction capacity, the purified oil of the primary injection is directly taken away by the air flow. Cause defects such as lack of oil, thereby providing an air conditioning system, a control method, and an air conditioner

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