Application of refrigeration compressor

First, refrigeration compressor transport gas and improve gas pressure of a driven fluid machinery. Is the heart of the refrigeration system, it inhales low temperature and low pressure refrigerant gas from the suction tube, and drives the piston to compress it through the motor operation. After that, the high temperature and high pressure refrigerant gas is discharged to the exhaust pipe, providing power for the refrigeration cycle, so as to realize the refrigeration cycle of compression → condensation → expansion → evaporation. Refrigeration compressor is the core and heart of refrigeration system. The capability and characteristic of compressor guide determine the capability and characteristic of refrigeration system. In a sense, the design and matching of refrigeration system is to reflect the ability of refrigeration compressor. Therefore, the refrigeration industry all over the world has invested a lot of energy in the research of refrigeration compressor, and new research directions and research results continue to appear. The technology and performance level of refrigeration compressors change with each passing day. There are many types of compressors. According to different working principles, refrigeration compressors can be divided into constant displacement compressors and variable displacement compressors.

Second, the characteristics of refrigeration compressor:

 Constant displacement refrigeration compressor

1. The refrigerating capacity of most fully enclosed piston compressors is not more than 0.5KW, which is mainly used in household refrigerators/freezers and small commercial refrigeration equipment.

2, scroll type compression cooling machine capacity range of 0.75 ~ 15KW, and most of the 3 ~ 5KW, the most application is in small household air conditioning, commercial air conditioning system. This type of compressor is not used for refrigeration at minus 5 degrees.

3, centrifugal refrigeration compressor is mainly used in air conditioning conditions of the chiller unit.

4. The cooling capacity of single screw compressor is between 30kw-1500kw, which can be used in cold storage, artificial ice rink and water chiller.

5. The semi-closed piston refrigeration compressor is widely used, and the single unit cooling capacity is from 3kw-100kw, and it can be used in parallel with multiple heads, so it can provide the cooling capacity range from 3kw-1000kw in multiple working conditions, and it can be used in refrigeration working conditions and air conditioning working conditions.

6, open piston type refrigeration compressor is only often used in cold storage, very few air conditioning conditions of the chiller unit.

Third, the development of refrigeration compressor:

China's domestic refrigeration compressor enterprises have long been accustomed to large-scale production mode, accustomed to the quantity of efficiency. But in the fierce price competition situation, with the product profit rate is decreasing day by day, when the production of millions of compressors can only make millions of yuan of profit, some special refrigeration compressor is a way out. Special refrigeration compressors include all kinds of things, it is impossible to list one by one here. But their common characteristics are small production scale, high profit per unit, rapid product transformation, in most cases need to be specifically designed for user requirements. This kind of product has attracted more and more attention of Chinese compressor enterprises. For example, several Chinese enterprises are developing or already have the production capacity of vehicle refrigerator compressor.

Fourth, the application of refrigeration compressor:

a. Refrigeration compressor index At present, most of the market of refrigeration compressor units in China is mainly occupied by some refrigeration enterprises from Europe, Japan and the United States. Well-known companies such as Trane, Carrier, York, McVille, AXIMA, Ebara, and Mitsubishi dominate the centrifugal chiller market with advanced technologies and good processes. The main domestic enterprises for Chongqing General, early introduction of NREC technology to develop centrifugal chillers. With the development of society, the user needs more and more high cooling capacity, and because of the requirements of energy saving, centrifugal units have a wider and wider market. Some domestic air conditioning manufacturers such as Haier, Akma, Gree and Midea have launched their own refrigeration compressor units. Dachen has collaborated with AXIMA to develop centrifugal chiller units and centrifugal heat pump units for district heating. Most of these centrifugal units use environmentally friendly working medium R134a.

b. As the form of energy becomes increasingly tight, energy saving and consumption reduction is a major trend of product development. In addition, due to the continuous improvement of China's urbanization level, building energy consumption is increasing. Centrifugal chillers with the highest coefficient of performance will undoubtedly become a hot spot in the market. In recent years, the sales of centrifugal chillers have been increasing.

c. Most of the companies developing centrifugal water chillers in China only buy imported compressors, with little profit. Foreign centrifuge manufacturers will not easily transfer their core technology, in order to develop refrigeration compressor, only to take the road of independent development. With the development of design and manufacturing technology, it is possible to develop the domestic centrifugal refrigeration compressor.