Since the founding of the People's Republic of China, China's compressor industry has grown from scratch. There are five types of compressors used in refrigeration and air conditioning industry: reciprocating compressor, screw compressor, rotary compressor, scroll compressor compressor and centrifugal compressor, among which reciprocating compressor is the most widely used compressor in small and medium-sized commercial refrigeration systems.
Screw compressors are mainly used in large commercial and industrial systems. Rotary compressors and scroll compressor are mainly used in household and small-capacity commercial air-conditioning devices, while centrifugal compressors are widely used in air-conditioning systems of large buildings.
Various reciprocating compressors are generally classified according to the form of compressor shell and the arrangement of driving mechanism. According to the shell form, there are open and closed semi-closed compressors. Enclosed means that the whole compressor is installed in a shell.
2. Current situation:
In the case of insufficient domestic compressor supply, China still needs to import a moderate amount every year. The main trading countries are Germany, the United States, Italy, Japan, Denmark, Brazil, South Korea and so on. Through equipment transformation, the quality and output of domestic compressors have been greatly improved.
3. Trends:
The next decade will be a crucial period for China to transform from a manufacturing power to a manufacturing power, and to realize the transformation from manufacturing in China to creating in China and manufacturing in China. Linear compressor technology has replaced the traditional compressor with its advantages of high efficiency, zero noise, zero pollution and simple structure. It is a real green industrial technology.
The six major performances of China's manufacturing industry in the next decade show that the manufacturing industry has developed into the pillar of China's national economy. The added value of manufacturing industry accounts for about one third of the national GDP, accounting for 80% of all industries; Taxes paid account for about 90% of all industries.
The export of manufactured goods accounts for 90% of the country's total foreign trade exports; Employees account for 90% of all industries. "From the development trend, there will be some changes in the next decade, but the manufacturing industry will still occupy a more important position in the national economy."
Extended data:
Classification of compressors:
According to its principle, compressors can be divided into positive displacement compressors and speed compressors. Volumetric type is divided into reciprocating compressor and rotary compressor; Speed compressors are divided into axial compressors, centrifugal compressors and mixed-flow compressors.
At present, the compressors of household refrigerators and air conditioners are all positive displacement, which can be divided into reciprocating and rotary types. Reciprocating compressors adopt piston, crank and connecting rod mechanism or piston, crank and sliding tube mechanism, and rotary compressors are mostly rolling rotors. Commercial air conditioners are mostly centrifugal, scroll and screw.
According to the scope of application, it can be divided into low back pressure type, medium back pressure type and high back pressure type.
Low back pressure type (evaporation temperature -35 ~- 15℃), generally used in household refrigerators, food freezers, etc. Medium back pressure type (evaporation temperature -20 ~ 0℃), generally used in cold drink cabinets, milk freezers, etc. High back pressure type (evaporation temperature -5 ~ 15℃), generally used in room air conditioners, dehumidifiers, heat pumps, etc.
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