Compressor

Commonly used air compressors today include piston air compressors, screw air compressors (which are further divided into twin-screw and single-screw air compressors), centrifugal compressors, vane air compressors, and scroll air compressors. Below are the definitions of various compressors. Compressors such as cam-type, diaphragm-type, and diffusion pumps are not included because of their specialized applications and relatively small size. 　　 Positive displacement compressors – are devices that confine a certain amount of continuous airflow within a closed space, thereby increasing the pressure. A reciprocating compressor is a positive-displacement compressor whose compression element is a piston that moves back and forth within the cylinder. 　　 Rotary compressor -- is a positive-displacement compressor, with compression being achieved through the forced movement of rotating elements. 　　 Sliding vane compressor -- is a rotary variable-displacement compressor in which axial vanes slide radially on an eccentric rotor within a cylindrical cylinder. The air trapped between the slides is compressed and then discharged. 　　 Liquid-piston compressors are rotary positive-displacement compressors in which water or other liquids are used as pistons to compress gas, which is then discharged. Rotary vane double-rotor compressor – belongs to the category of rotary positive-displacement compressors, in which two Rotary vanes mesh with each other to trap gas and transport it from the inlet to the outlet. There is no internal compression. 　　 A screw compressor is a rotary positive-displacement compressor in which two rotors with helical gears mesh with each other to compress and discharge the gas. 　 Speed-type compressors are rotary continuous-flow compressors in which high-speed rotating blades accelerate the gas passing through them, thereby converting kinetic energy into pressure. This transformation occurs partly on the rotating blades and partly on the fixed diffuser or recirculator vanes. 　　 Centrifugal compressors – belong to the speed-type compressors, in which one or more rotating impellers (with blades usually on the sides) are used to accelerate the gas. The main airflow is radial. 　　 Axial flow compressors – belong to the velocity-type compressors, in which the gas is accelerated by a rotor equipped with blades. The main airflow is axial. 　　 Mixed-flow compressors – also classified as speed compressors – have a rotor design that combines certain features of both centrifugal and axial flow compressors. 　　 Jet compressor -- uses a high-speed gas or steam jet to carry away the gas drawn in, and then converts the velocity of the mixed gas into pressure in a diffuser

The new equipment purchased by our factory is from Japanese companies such as Mitsubishi and Hitachi; there isn’t much difference compared to domestic equipment. The best equipment isn’t sold to us. The Mitsubishi one is 7V7B.

Large centrifugal compressors that use high-pressure and medium-pressure steam; they are second-hand equipment from Mitsubishi in Japan and the United States. But it’s been over thirty years now, and it still works quite well!

Hangzhou Motor + Shenyang Steam Turbine； The domestic equipment in Jinxi keeps breaking down and requiring repairs year after year; it’s really unbelievable~~~~~. So far, it has only been in use for seven years. The entire production is dependent on these few machines; there’s nothing that can be done about it.

Domestic piston compressors are quite mature; those produced by Shanghai, Weifang, Wenzhou Guonai, and Shenqi are all pretty good.

Domestically produced centrifugal compressor manufacturers such as Shenhua Gas Turbine and Shaanxi Gas Turbine are well-known; for reciprocating compressors, there are companies like Shenyang Gas Compressor Factory and Wuxi Gas Compressor Factory. As for ammonia compressors used specifically for ammonia refrigeration, these are produced by Dalian Refrigerator Factory, Wuhan New World Company, and Yantai Binglun Company. There are also many manufacturers of ordinary air compressors, such as Kaishan Co., Ltd. in Zhejiang and Hongwuhuan Company.