Compressor system oil equalization control method and multi-compressor parallel system

Abstract

The invention discloses an oil-equalizing control method for a compressor system and a multi-compressor parallel system. The method comprises the following steps: arranging N parallel rotor compressors; starting N1 compressors for simultaneously running; detecting phase angles of motor rotors of N1 compressors; judging if the phase angles of motor rotors of N1 compressors are consistent; if yes, running a conventional running control program for controlling the running of the N1 compressors; if not, adjusting the phase angles of motor rotors of N1 compressors and adopting the conventional running control program for controlling the running of the N1 compressors after the phase angles are consistent. According to the invention, the oil-equalizing problem between the compressors in the multi-compressor parallel system is solved; the phenomenon of compressor damage caused by long-term oil shortage of the compressors in the multi-compressor parallel system is avoided; the pipeline design is simplified; the problem of complex manufacturing technique caused by redundant pipelines is solved.

Description

technical field [0001] The invention relates to the technical field of oil equalization in a compressor system, in particular to a method for controlling oil equalization in a compressor system and a multi-compressor parallel system. Background technique [0002] At present, most systems with multiple compressors running in parallel use oil equalizing pipes to achieve oil equalization between compressors to ensure oil level balance in the compressors. However, this method usually brings several problems: First, the pipeline structure is complex and the design difficulty increases. For a system with a small shell, it is more difficult to route the pipes, and the process requirements are higher. Secondly, lack of phase angle control, even if the compressors operate at the same frequency, in a compression cycle, due to the phase angle difference, the suction load will be different, thus affecting the oil return balance. Contents of the invention [0003] Based on this, it i...

AI Technical Summary

Problems solved by technology

However, this method usually brings several problems: First, the pipeline structure is complex and the design difficulty increases

For a system with a small shell, it is more difficult to route the pipes and has higher requirements on the process

Secondly, lack of phase angle control, even if the compressor operates at the same frequency, in a compression cycle, due to the phase angle difference, the suction load will be different, thus affecting the oil return balance

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