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Classification and structure of commercial refrigeration compressors
author: supermarket refrigerated showcase category: commercial refrigeration Views: 569Time: 2016-08-22
Classification and structure of commercial refrigeration compressors
The classification and structure of commercial refrigeration compressors are currently commonly used, and the scope of application of various compressors in refrigeration and engineering. Here are two types of compressors commonly used in commercial refrigeration: piston compressors and screw compressors. Piston compressors Piston compressors mainly rely on a mechanism consisting of a cylinder, a piston, a connecting rod (slide tube, slider) mechanism, a crankshaft, and suction and exhaust valves to complete the compression process of the refrigerant vapor. Piston compressors can be divided into open type and closed type according to their structure. The characteristic of the enclosed type is that the drive motor and the compressor crankshaft are enclosed in the same space, without the need for a shaft sealing device. According to whether the closed shell can be disassembled, it can be divided into semi-closed type and fully closed type. The characteristic of the open type is that the motor and the compressor are not in the same housing, and the torque is transmitted through the coupling or the transmission pulley. Because ammonia refrigerant chemically reacts with the copper that constitutes the rotor of the electric motor, Freon is generally used as the commercial refrigeration refrigerant in hermetic compressors. This refrigerant is not easy to explode and is highly efficient and reliable. Small-scale or domestic commercial refrigeration refrigeration equipment mostly uses hermetic compressors, but most of the ammonia refrigeration compressors and Freon compressors with large refrigeration capacity are open-type.
Screw Compressor
1) Operating Principle of Screw Compressor Screw compressor is divided into single screw and twin screw, single screw is generally less used in commercial refrigeration, so only twin screw compressor is introduced here. The volume of a pair of tooth grooves formed by the female and male rotors of the twin-screw compressor, the cylinder wall and the end cover is called the elementary volume. The size and position of the element volume change with the rotation of the rotor. The working principle of the twin-screw compressor: When the volume of the elementary element communicates with the suction port, the compressor begins to inhale until the elementary volume reaches the maximum, and the suction ends. As the rotor rotates, the volume of the elementary element is separated from the suction port. Due to the mutual squeezing of the teeth and grooves, the gas in the element volume is compressed, and the rotor continues to rotate. At a certain position, the element volume and the displacement The air ports are connected, the compression ends, and the exhaust starts at this moment, and the exhaust process is until exhaustion. With the continuous rotation of the rotor, the above process will be carried out continuously and repeatedly. The commercial refrigeration refrigerant is continuously sucked in from one end of the screw compressor and discharged from the other end.
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