Rotary compressor and control method thereof

Abstract

The invention relates to a rotary machine. The rotary machine comprises a shell (20), a main bearing base (90) fixedly arranged in the shell, a revolving shaft (80) and a pressure sensor (120), wherein the main bearing base is internally provided with a main bearing (92), the main bearing base can rotatably support the revolving shaft (80) through the main bearing, the revolving shaft is internally provided with a through hole (84) which axially extends along the revolving shaft, and the through hole (84) forms one part of a lubricating oil loop; and the pressure sensor (120) is communicated with a fluid in the through hole (84) through a lubricating oil detecting channel (110), and the pressure sensor outputs a cut-off signal when the pressure formed by lubricating oil from the lubricating oil detecting channel is less than a predetermined value. The invention also relates to a control method of the rotary machine, and when the pressure sensor detects that the fluid pressure generated by the lubricating oil flowing in the through hole is lower than the predetermined value, the operation of the rotary machine is stopped. According to the invention, the amount of the lubricating oil in the rotary machine can be directly and reliably detected.

Description

technical field [0001] The present invention relates to a rotary machine, especially a rotary compressor, and also relates to a control method of the rotary machine. Background technique [0002] A rotary compressor is one of rotary machines and generally includes a housing, a compression mechanism accommodated in the housing, a driving mechanism for driving the compression mechanism, a rotary shaft driven by the driving mechanism, and the like. Typically, axially extending oil holes are provided in the rotating shaft to supply lubricating oil to various moving parts of the compressor. In order to ensure the normal operation of the compressor, there must be enough lubricating oil in the oil hole of the rotating shaft to ensure that various moving parts are fully lubricated. When the amount of lubricating oil flowing in the oil hole is lower than a predetermined value, the compressor should be stopped to protect the compressor. [0003] At present, dual or even multi-compre...

AI Technical Summary

Problems solved by technology

In this dual or multi-compressor system, one or more of the compressors can be selectively started and the others can be shut down, so the lubricating oil will move in these compressors and may cause The lubricating oil is not balanced, and even some compressors lack lubricating oil

[0004] In addition, whether it is in a compressor system composed of a single compressor or in a multi-compressor system composed of multiple compressors, there may be a lack of lubricating oil due to oil leakage in the compressor system or the compressor.

[0005] In addition, in a large-scale refrigeration system, due to the long pipeline length and many components, the lubricating oil may not be circulated back to the compressor in time, causing the compressor to lack lubricating oil.

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