Since conventional refrigeration systems use fixed-speed compressors, the focus of research on refrigeration systems and compressors has been on efficiency and other operating characteristics during steady-state operation at nominal and rated speeds. The conventional refrigeration system uses a fixed-speed compressor to perform switching control, and the compressor is driven by a squirrel-cage motor attached to the compressor to adjust the evaporation temperature. This control method causes the evaporation temperature to fluctuate greatly and easily affects the temperature of the cooled environment. During the working process, the compressor motor must constantly overcome the huge moment of inertia generated by the rotor from the static to the rated speed. Especially when starting with the load, the starting torque is many times higher than the running torque, and the result is not only extra cost. Electrical energy, and can increase the wear of moving parts of the compressor. In addition, this mode of operation will generate large vibration, noise and inrush current during the starting process, causing fluctuations in the power supply voltage. Therefore, an inverter compressor should be used instead of the fixed speed compressor to avoid such frequent start and stop processes.
The research on the inverter compressor starts from the reciprocating piston machine, but due to the characteristics of its reciprocating motion, it affects the frequency conversion characteristics; thus, it is transferred to the rotary compressor such as the rolling rotor compressor and the scroll compressor. Greatly improved the performance of the compressor.
Among them, the scroll compressor is a new type of volumetric compressor, which has the characteristics of compact structure, high efficiency, high reliability and low noise, especially for variable frequency control operation. However, due to the lack of CNC machining technology and the lack of proper solutions to the problem of axial force balance, it has not been completed for a long time. In the 1970s, ADL Company of the United States completed a fruitful study, first solving the sealing technology of the end wear compensation of the scroll. Based on this, we have cooperated with Switzerland to develop a prototype of a scroll compressor with various working fluids. The true scale production of scroll compressors began in Japan. In 1981, SANDEN Corporation began to produce scroll compressors for automotive air conditioners. In 1983, Hitachi began to produce 2~5Hp scroll compressors for room air conditioners. In addition, in the United States, since Copeland launched its vortex compressor production line in 1987, Carrier, Trane, Tecumseh and other companies have also set up factories to produce high-quality scroll compressors. The variable frequency scroll compressor has been applied to the cabinet air conditioner, and the energy saving effect is obvious, and the refrigeration coefficient is increased by about 20%, which has become a research hotspot of the scroll compressor.
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