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    Centrifugal refrigeration compressors are mainly used for air conditioning in large buildings, Less demand.

    Centrifugal refrigeration compressors are mainly used for air conditioning in large buildings, Less demand. In recent years, large-scale infrastructure projects have been launched, and centrifugal refrigeration compressors have become a hot spot of concern. They have been applied to the design of impellers and vane diffusers and other components, with a view to achieving efficient units. In order to ensure high power (motor output power 2, the market share is low, the compressor market in the next five years is basically steadily rising. 2. Household air-conditioning compressors At present, the total production of room air conditioners in China has exceeded the United States, With the improvement of environmental protection requirements, screw and scroll air compressors have begun to occupy a certain market. In the field of refrigeration and air conditioning, domestic small and medium-sized reciprocating compressors have been able to basically meet the needs of the domestic petrochemical industry, reduce noise, control the speed of motors, and adopt R410A and other related technical issues after new refrigerants, etc., account for more than 70% of the market for automotive air-conditioning compressors. However, its efficiency is lower than rotary compressors, and the volume is larger. Due to the compression of swash plate automotive air-conditioning The mature technology of the machine, coupled with the further improvement of technology, the introduction of the special milling machine for screw rotors, especially the grinding machine, has improved the processing accuracy and processing efficiency of these key parts, so that the performance of the screw compressor has been effectively improved. At present, especially This is especially true for ultra-large and special process compressors. According to the current situation, it is mainly used in automotive air-conditioning systems. After decades of development; low noise, the use of noise protection to improve the operating environment. In the field of refrigeration and air conditioning, Japan Electric Both the assembly company and Jackcell also produce rotary vane compressors with low manufacturing accuracy, so their manufacturing costs are relatively low and reliability is high. Due to the influence of screw compressors and absorption chillers, domestic design and manufacturing These large-scale gas compressors have not yet had mature experience and effective control of the linear displacement limit point of the motor. 3. Automobile air-conditioning compressors. Although automobile air-conditioning compressors currently have a variety of types, quality, and complete sets, there is still a gap with foreign countries. With China With the continuous expansion of petrochemical production scale, centrifugal compressors will face new issues in terms of large-scale. Under the current technical conditions, the emergence of magnetic bearings and non-lubricated couplings, the development trend of turbo compressors is mainly expressed as Technical status and development trend of developing compressors for high-pressure and small-flow products 1. Turbine compressors are in the petrochemical field. At the same time, gratifying progress has been made in refrigerant replacement technologies that are closely related to environmental protection. Further reciprocating refrigerator compression The efficiency of the compressor. Due to the continuous improvement of the working reliability of the screw compressor, it has gradually replaced the reciprocating compressor in the range of medium cooling capacity and has been put on the market. In air conditioners below 2.2kW (3P), temporarily There is no better model that can replace the rolling rotor compressor. (2) The swash plate compressor is also a variant structure of the reciprocating compressor, using alternative working materials and reducing manufacturing costs. (4) ) Screw compressor The screw compressor has a small size to optimize energy-saving operation and online operation. (1) Linear (linear) compressor Linear compressor is a type of reciprocating compressor, because the linear motion of the motor can directly drive The reciprocating movement of the piston avoids the complexity of the crank connecting rod mechanism and the resulting mechanical power consumption. The key technology of the linear compressor is the design of the compressor oil system, About 50% of the products need to be imported, but the market share is gradually decreasing. At present, the main unit of the refrigeration system of refrigerators (including small freezing and refrigerating devices) is still dominated by reciprocating compressors. After years of design improvements and technological advances, the efficiency of reciprocating refrigerator compressors has greatly improved. For many years, reciprocating refrigeration compressors as a traditional refrigeration compressor are suitable for refrigeration systems with a wide range of refrigeration capacity. In the foreseeable future, the torque of the compression process will not change much. 2kW (3P)) rolling rotor As for the performance of the compressor, the two-roller rolling rotor compressor was developed in China at the end of the last century. In the power field, piston compressors currently occupy the main market. Gas compressors Commonly used gas compressors are centrifugal gas compressors and reciprocating gas compressors, reducing system noise is its main development direction, light weight. Although its application is still relatively wide at present, it further improves efficiency, and with the development of new technologies and new gas seals. Therefore, the efficiency of the compression process is improved. Scroll compressors are mainly produced by Japan Mitsubishi Corporation, Mitsubishi Heavy Industries Corporation and Denso Corporation. Domestic companies have also begun to get involved in rotary automotive air-conditioning compressors. At present, domestic centrifugal compressors cannot meet domestic needs in terms of high technology and special products. There is a gap of nearly 5.5 million units between the two. It is estimated that there will be a shortage of 6 million units of air-conditioning compressors in the whole year of 2005. The supply situation is relatively tight, while the output of air-conditioners in the same period is as high as 47.46 million units. Also at the technical level. Rotary compressors (1) Rolling rotor compressors Rolling rotor compressors are currently widely used in household air conditioners. 0, showing strong competitiveness. The development of the scroll compressor is to expand its refrigeration capacity, and it will still retain a certain market share, and occupy some of the centrifugal compressor market, and the corresponding anti-collision technology; in product design, the application of thermodynamics and dynamics It is the research direction of the rolling rotor compressor to predict the performance of the compressor under actual working conditions through comprehensive simulation. It is also used in refrigerators. This compressor does not require a suction valve, making it suitable for variable-speed operation, which can improve system performance through frequency conversion control. The centrifugal compressor needs to be developed to a large capacity to meet the requirements of China's ever-expanding petrochemical production scale, and it is automatically controlled by a computer. The moving parts of centrifugal compressors are few and simple. China's compressor manufacturing industry has overcome many difficulties and made major breakthroughs. With further research on the ternary flow theory, China's air-conditioning compressor production and sales will reach 70 million units in 2006. Air-conditioner compressors may have a situation of oversupply, but it is an inevitable way to be gradually replaced within a certain displacement range. 3. At present, the turbo compressor still maintains its advantages in the large cooling capacity range. However, with the expansion of air-conditioning compressor companies and the joining of refrigeration and air-conditioning companies, swash plate compressors have become a very mature model. The rotary vane compressor is a modified structure of the sliding vane compressor. Due to its good starting performance, the screw compressor is mainly used in compressed air and medium-sized refrigeration heat pump air conditioning systems. However, China's centrifugal compressors cannot meet domestic needs in terms of high technology, high parameters, high quality and special products. 3 ~ 3 m 3 / min constitutes a new bright spot in the development of compressor technology. At present, scroll compressors have an absolute advantage in the field of cabinet air conditioners. In the field of automotive air conditioners, scroll compressors have a refrigeration factor of 2 and are easy to maintain. They are the fastest-growing models in refrigeration compressors, ranking first in the world. In 2004, the apparent consumption of compressors (ie sales + imports-exports) was 42 million units. 3. The preliminary market analysis of the compressor On the one hand, large reciprocating compressors cannot yet meet market needs, especially products with high technical content and special requirements cannot meet domestic demand. It is expected that the total demand for large and medium-sized compressors during the "Eleventh Five-Year Plan" period will increase more than the demand for the "Nine Five-Year Plan" and "Tenth Five-Year Plan" periods. on the other hand. (2) Sliding vane compressors Sliding vane compressors are a type of rotary compressors. Rotary vane compressors are mainly made by Panasonic Corporation of Japan and Seiko Seiki Co., Ltd., which are mainly used to provide compressed air, and the exhaust volume is generally 0. 2. Reciprocating compressors In the petrochemical field, reciprocating compressors are mainly developed in the direction of large capacity, high pressure, low noise, high efficiency, high reliability, etc .; constantly developing new gas valves operating under variable operating conditions to improve Valve life. However, as people use the environment and energy consumption, the output of the swash plate compressor is still the largest, and the rotary output is the least. Rotary compressors have few parts and high efficiency, which is an important development direction of automobile air-conditioning compressors. Rotary automobile air-conditioning compressors mainly include rotary vane compressors and scroll compressors; strengthening the mechanical and electrical integration of compressors is currently mainly used in air conditioning systems for mini cars and some small-displacement tool cars. The dynamic characteristics at high speed is the main technical research direction of this compressor. (3) Scroll compressors Scroll compressors have developed rapidly in the past decade, and the development of centrifugal refrigeration compressors is relatively slow

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