| Scroll compressor as a new and high-efficiency displacement compressor, possessing characteristics of small size, small bulk, light weight, compact structure, high efficiency, balanceable torque, small vibrancy, low noise, working smoothly etc, is widely used in refrigeration and air-conditioning units. Therefore, it is quite important to investigate inherent structure, working process and the whole performance of scroll compressor.The thermodynamic behavior of the scroll compressor plays a dominant role on the internal structure as well as the base of working. The thermodynamic models are built. These models include the heat exchange and leakage of lubricating-oil and gas.By compared the structure characteristics of single-scroll compressor with twin-scroll compressor and based on the thermodynamic theory of single-scroll compressor, thermodynamic models of the twin-scroll compressor and formula of leaking mass are built.A new type of scroll compressor — a scroll compressor under liquid refrigerant injection has been investigated. The working principle and structure characteristics have been analyzed and thermodynamic models as well as energy conservation equation, mass conservation equation and heat-flowing equation are built. The relationship between injection ratio and discharge temperature, compression power, mass-flowing ratio are described according to the result of experiment.In the paper, Particle swarm optimization (PSO) as a new intelligent calculating technology is used to optimize the structural parameter of scroll compressor. The basic principle of PSO has been interpreted. The flow chart of PSO and particle moving chart has initially been given. The results of optimization prove that PSO is an efficient method with rapid convergence and simple process. The research can accelerate the further study about PSO and generalize the use.
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