Variable-frequency air conditioner and compressor oil return system thereof

Abstract

The invention discloses a variable-frequency air conditioner and a compressor oil return system thereof. The compressor oil return system comprises a compressor, an oil separator and an oil level controller, wherein an air suction port, a first air exhaust port and an oil injection hole are formed in the compressor; the oil separator communicates with the first air exhaust port through a first air exhaust tube; the oil separator is further provided with a second air exhaust port and an oil outlet; the oil level controller is used for controlling whether the compressor intakes oil or not; the oil level controller comprises a switch; one end of the oil level controller communicates with the oil injection hole; the other end of the oil level controller communicates with the oil outlet through an oil outlet tube; the oil level controller comprises a switch; when oil in the compressor is insufficient, the switch is opened; and when oil in the compressor is sufficient, the switch is closed. By adopting the variable-frequency air conditioner, the problem that the compressor is difficult to return oil at a far distance under low frequency can be effectively solved, so that the service life of the compressor is prolonged; and the variable-frequency air conditioner is simple in structure and is reasonable in design.

Description

technical field [0001] The invention relates to the field of frequency conversion air conditioners, in particular to a frequency conversion air conditioner and a compressor oil return system thereof. Background technique [0002] In recent years, with the rapid development of rack-type data centers, the demand for DC inverter air conditioners has also increased. Because of their high efficiency and stepless adjustment of cooling capacity, they are very popular among users. Among them, in the case of applications where the thermal load of the cabinet is small, the inverter air conditioner can also solve the problems of frequent start and stop, temperature fluctuation, and condensation that cannot be solved by the fixed frequency air conditioner. [0003] However, when the distance between the indoor unit and the outdoor unit (with compressor) is long and the pipes are long, the inverter air conditioner has the problem of difficult oil return. Generally, once the distance betw...

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Problems solved by technology

[0003] However, when the distance between the indoor unit and the outdoor unit (with compressor) is long and the pipes are long, the inverter air conditioner has the problem of difficult oil return. Generally, once the distance between the compressor and the indoor unit exceeds 15m, it is difficult for the lubricating oil to return through the pipe during low-frequency operation. To the compressor, and the distance is too long, the phenomenon of difficulty in oil return will be more obvious. If the compressor runs without oil, it will lead to poor lubrication, aggravate slipping, and eventually damage the compressor, thus limiting some of the indoor and outdoor units. Use occasions increase the limitations of the use of inverter air conditioners

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