Compressor decompression operation method and structure thereof

According to the pressure reduction operation method and structure of the compressor, the compressor is provided with a pressure supplementing loop, and in the first step, the system pressure is a constant value; secondly, the pressure value of an inlet of the compressor is gradually reduced, meanwhile, the backflow amount of the pressure supplementing loop is gradually reduced till the backflow amount of the pressure supplementing loop is completely closed, pressure reduction operation is completed, and the compressor runs in the state; and thirdly, the system pressure and the inlet pressure of the compressor are automatically adjusted so that the system pressure can be kept at a constant value. The method reduces the pressure in front of the compressor, cancels the pressure compensation circulation volume of the compressor, and realizes efficiency improvement and energy conservation. 本发明一种压缩机减压操作方法及其结构，压缩机设有补压回路，第一步系统压力为一恒定值；第二步，逐渐降低压缩机进口的压力值，同时逐渐降低补压回路的回流量直至完全关闭补压回路的回流量，完成减压操作，压缩机以此状态运行；第三步，系统压力与压缩机进口压力之间自