Prospect analysis of screw refrigeration compressor

The market potential of China's refrigeration and refrigeration industry is very high, especially the development prospects of medium and low temperature refrigeration and refrigeration equipment in the agriculture, fishery, and animal husbandry industries are very broad. Compared with the situation in developed countries, the mainland is in the cold storage of agricultural, fishery, animal husbandry and other agricultural and sideline products. There is a big gap in refrigeration and logistics. The increasingly strict industrial technology level has driven the steady increase in the demand for industrial refrigeration equipment. China's refrigeration and refrigeration industry accounts for about 20% of the entire refrigeration industry, which is far lower than the international mature market about 40%. It is optimistic that the average growth rate of industrial refrigeration equipment by 2010 is about 20% to 25%, and the neutral is expected to grow between 10% and 20%.

Because of its long-term suitability for 24-hour operation and the continuous advancement of technology used in low-temperature systems, screw compressors have greatly improved their performance and efficiency. In developed countries such as Europe and the United States, screw compressors have gradually begun to be used in low-temperature refrigeration systems. It replaces the traditional piston model and becomes the standard configuration. Refrigeration and refrigeration compressors can be divided into small refrigeration and refrigeration compressors and large refrigeration and refrigeration compressors, of which small refrigeration and refrigeration compressors are mainly used in refrigerators (reciprocating and rotary structures, frequency conversion technology is the future development direction) and refrigerated vehicles ( Vehicle-mounted screw compressors are the direction of the field; large and medium-sized refrigerating and refrigerating compressors are mainly used in food/aquatic quick freezing processing, refrigerated ships, refrigerated containers and cold storage, mainly reciprocating and screw types.

The unification of the open-type piston/semi-hermetic piston refrigeration compressor has been changed. Because the screw compressor has the advantages of simple structure, reliable operation, high energy efficiency ratio, fewer wearing parts and convenient operation and adjustment, it is gradually Replace piston compressors, occupying an increasing market share.

With the rapid progress of food freezing technology, the reform of China's food structure and packaging, especially the rapid development of the small-package frozen food industry, the food freezing method has undergone major changes, which have been widely adopted since the 1950s and 1960s. The intermittent and slow warehouse-type and shelf-type freezing rooms have been replaced with fast and continuous freezing devices (tunnel, spiral, fluidized). The temperature of the freezing chamber has dropped from -33 to -35°C to -40 to -42°C, thus speeding up the freezing speed and improving the quality of frozen products. At the same time, with the application of automatic control technology in the cold storage refrigeration system. Large and medium-sized cold storage basically realized real-time display and automatic recording of storage temperature, refrigeration system pressure, equipment operating status, etc., and with the large number of applications of screw compressors in cold storage, PLC automatic control gradually replaced the traditional manual way to control.

China’s refrigeration and cold storage construction pays more attention to environmental protection and energy conservation. China’s “Eleventh Five-Year” plan proposes that energy consumption per unit of GDP should be reduced by 20% compared with the end of the “Eleventh Five-Year” period. The International Institute of Refrigeration (IIR) requires that in the next 20 years, The energy consumption of each refrigeration equipment should be reduced by 30% to 50%. Therefore, efforts to reduce cooling energy consumption are the inevitable choice for Chinese refrigeration enterprises to improve their market competitiveness and sustainable development.

Energy-saving measures for refrigerated storage: (1) Enclosure structure adopts energy-saving insulation layer thickness; (2) Reduces the intrusion of hot and humid air through the opening of refrigeration door; (3) Adopts refrigeration compressor with high COP (single-stage screw compression) Machine or single-machine two-stage screw compressor), high-efficiency water pumps and fans; (4) Wider use of evaporative condensers; (5) Reasonable adjustment of chiller energy; (6) Reasonable defrosting methods for evaporators Defrost in time; (7) Reasonable operation of refrigeration equipment-such as increasing the utilization rate of valley electricity.