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    Do you know several common refrigeration compressors

    Do you know several common refrigeration compressors 1. Half-sealed piston refrigeration compressor Among various types of refrigeration compressors, piston compressors are the earliest and still have more models. For example, semi-hermetic piston refrigeration compressors are widely used in refrigeration and refrigeration equipment. Common manufacturers are: Emerson, Bitzer, Sanyo, Du Ling and other compressors. Features of semi-hermetic piston refrigeration compressor: wide energy pressure range and refrigeration capacity, low material requirements, mature technology, relatively simple compressor system, but very afraid of liquid shock. The common failures of semi-hermetic piston refrigeration compressors have two aspects: mechanical failures and electrical failures. Common mechanical failures include connecting rods, crankshafts, valve plates and valve plates are worn or damaged; electrical failures are more common due to short circuit, open circuit and burnout of motor windings. 2. Double rotor refrigeration compressor Double-rotor compressors are now widely used in home appliances, and the export scale of rotor compressors has increased year by year. The ten-year compound growth rate of cold years from 2009 to 2019 is 12.8%. There are now many air-conditioning equipment that choose double Rotor compressor. Rotor compressor features: few components and simple structure. There are few vulnerable parts and reliable operation. Without suction valve, the clearance volume is small, the gas transmission coefficient is high, the processing accuracy is high, the sealing performance is poor, and the leakage loss is large. Before, a friend asked Refrigeration Encyclopedia, what are the advantages of scroll compressors and double rotor compressors compared to each other. The advantages of the dual-rotor compressor are: the low-frequency energy efficiency ratio is good, the high-frequency energy efficiency ratio is not as good as the vortex, the noise vibration wear is slightly larger than the vortex, the life is shorter than the vortex, and it is difficult to make a large displacement. The advantages of the scroll compressor are: the low frequency energy efficiency ratio is general, the high frequency energy efficiency ratio is better than the scroll, the noise and vibration are less worn, the life is long, and the large displacement can be achieved. 3. Scroll refrigeration compressor The scroll compressor is mainly composed of: a moving disk (vortex rotor), a static disk (vortex stator), a bracket, a cross coupling ring, a back pressure cavity, and an eccentric shaft. It can be divided into two types: low pressure cavity compression and high pressure cavity. The low-pressure chamber compressor shows that the entire casing is low temperature, and the inside of the shell chamber (except the exhaust port and the exhaust chamber) is low pressure; Both the air port and the suction chamber are high pressure. Scroll compressor features: smooth operation, low vibration, quiet working environment, few wearing parts, stable operation, low noise, long life, high EER value, and is used in refrigeration and air conditioning systems. 4. Screw refrigeration compressor Screw refrigeration compressor is mainly composed of casing, rotor, bearing, shaft seal, balance piston, energy adjustment device and so on. The screw refrigeration compressor has two screws with spiral grooves meshing and rotating, resulting in a change in the volume between the teeth, thereby completing the process of suction and compressor. The cooling capacity can be adjusted steplessly between 10% -100%. Screw refrigeration compressors are now widely used in refrigeration and refrigeration and HVAC equipment. The characteristics of screw refrigeration compressor: the rotor, bearing strength and wear resistance are relatively high; the exhaust volume is almost not affected by the exhaust pressure; the high efficiency is maintained in a wide range of working conditions; the energy can be adjusted continuously , Not sensitive to infusion. Someone asked the refrigeration encyclopedia technology group before, screw compressors are afraid of liquid shock, many people answered that they are not afraid of liquid shock. In fact, screw compressors are also afraid of liquid shock, but screw compressors are not so sensitive to a small amount of liquid return, and a large amount of liquid return will cause compressor failure. This needs to be noted. 5. Centrifugal refrigeration compressor The centrifugal refrigeration compressor belongs to the speed type compressor, which is a type of impeller rotating machinery. It relies on the impeller rotating at high speed to do work on the gas to increase the pressure of the gas. Refrigeration compressors with a unit capacity of more than 1200kW almost all use centrifugal refrigeration compressors. Generally, centrifugal compressors are used in large and large air conditioning equipment. Centrifugal refrigeration compression characteristics: good dynamic balance characteristics, small vibration; few wear parts, long continuous operation cycle; easy to achieve multi-stage compression and throttling, and achieve multiple evaporation temperatures; can be economically adjusted steplessly; when the cooling capacity is small , Low efficiency; easy to surge,

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