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    What are the characteristics of cold storage semi-closed and fully enclosed refrigeration compression

    What are the characteristics of cold storage semi-closed and fully enclosed refrigeration compression Cold storage refrigeration compressors can be divided into two major categories: semi-hermetic and fully-enclosed refrigeration compressors according to their structure. At present, the main market is semi-hermetic piston refrigeration compressors (the amount of screw compressors is increasing). Semi-hermetic piston refrigeration compressors are generally driven by four-pole motors, and their rated power is generally between 60-600KW, and the number of cylinders is 2 --8, up to 12. 　　The totally enclosed refrigeration compressor and the matched motor share a main shaft installed in the casing, so the shaft sealing device can be eliminated, reducing the possibility of leakage. Below we look at its advantages and disadvantages. Advantages: Refrigeration compressor and motor are installed in a shell that is welded or brazed, sharing a main shaft, which not only eliminates the shaft sealing device, but also greatly reduces and reduces the size and weight of the entire compressor. Only the suction and exhaust pipes, process pipes and other necessary pipes (such as spray pipes), input power terminals and compressor brackets are welded to the surface of the casing. Disadvantages: Because the entire refrigeration compressor motor unit is installed in a sealed housing that cannot be disassembled, it is not easy to open for internal repairs. Therefore, it is required that the use of such refrigeration compressors has high reliability and long life, and the installation of the entire refrigeration system The requirements are also high, this fully enclosed structure is generally used in mass production of small refrigeration compressors. Semi-hermetic refrigeration compressors mostly adopt the cylinder block-crank box overall structure, and the motor casing is often an extension of the cylinder block crank box to reduce the connection surface and ensure the concentricity between the compressor-level motors. The two spaces of the crankcase and the motor room are connected by holes to facilitate the return of lubricating oil. The main shaft of the semi-hermetic refrigeration compressor is a crank shaft or an eccentric shaft structure; the built-in motor is cooled by air or water, and some uses low-temperature working fluid vapor. For semi-hermetic compressors in a small power range, centrifugal oil supply is often used for lubrication. Widely used in cold storage, refrigerated transportation, freezing processing, display cabinets and kitchen refrigerators. 　　 Advantages of semi-hermetic refrigeration compressor: Can adapt to a wider pressure range and cooling capacity requirements; higher thermal efficiency, less unit power consumption, especially the presence of the gas valve makes the deviation from the design operating conditions more obvious; low material requirements, more common steel materials, The processing is relatively easy and the cost is relatively low; the technology is relatively mature, and a wealth of experience has been accumulated in production and use; the device system is relatively simple.

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