1. Semi-hermetic piston refrigeration compressor.
Among various types of refrigeration compressors, piston compressors are the earliest and are still used more frequently. For example, semi-hermetic piston refrigeration compressors are widely used in refrigeration equipment. Common manufacturers are: Emerson, Bitzer, and other compressors.
Characteristics of semi-hermetic piston refrigeration compressors: wide pressure range and refrigeration capacity, low material requirements, relatively mature technology, relatively simple compressor system, but very afraid of liquid shock.
There are two common faults in semi-hermetic piston refrigeration compressors: mechanical faults and electrical faults. The common mechanical faults are wear or damage to the connecting rod, crankshaft, valve plate and valve plate; electrical faults are more common in the short circuit, open circuit and burning of the motor winding.
2. Scroll refrigeration compressor.
The scroll compressor is mainly composed of: moving disk (scroll rotor), stationary disk (scroll stator), bracket, cross-coupling ring, back pressure chamber, and eccentric shaft. It can be divided into low pressure chamber compression and high pressure chamber.
The low-pressure cavity compressor shows that the entire shell is low temperature, and the shell cavity (except the exhaust port and the exhaust cavity) is low-pressure; the high-pressure cavity compressor shows that the entire shell is high temperature, and the shell cavity (except the suction port and suction chamber) are high pressure.
Scroll compressor features: stable operation, low vibration, quiet working environment, few wearing parts, stable operation, low noise, long life, high EER value, and are used in refrigeration and air conditioning systems.
3. Screw refrigeration compressor.
The screw refrigeration compressor is mainly composed of a casing, a rotor, a bearing, a shaft seal, a balance piston, and an energy adjustment device. The screw refrigeration compressor has two screws with helical tooth grooves meshing and rotating, which causes the change of the volume between the teeth, so as to complete the process of suction and compressor, and the cooling capacity can be adjusted steplessly between 10% and 100%. Screw refrigeration compressors are now widely used in refrigeration and HVAC equipment.
The characteristics of screw refrigeration compressors: the rotor, bearing strength and wear resistance are relatively high; the exhaust volume is almost not affected by the exhaust pressure; it maintains a high efficiency in a wide range of working conditions; it can realize stepless adjustment of energy , not sensitive to the liquid.
Someone asked in the Refrigeration Encyclopedia Technology Group before whether screw compressors are afraid of liquid shock, and many people answered that they are not afraid of liquid shock. In fact, the screw compressor is also afraid of liquid shock, but the screw compressor is not so sensitive to a small amount of liquid backflow, and a large amount of liquid backflow will cause the compressor to malfunction, which needs attention.
Post time: May-27-2022