First of all, it should be noted that whether it is a screw or reciprocating air compressor loading and unloading should not be too frequent, so that the host motor and other wear and tear parts will have a certain degree of damage, such as the host motor bearing intake valve assembly and the minimum pressure valve, etc.?
Air compressor loading and unloading pressure has an upper and lower limit, that is, the loading pressure and unloading pressure range can not be less than 0.08MPA, smaller than this range is not adjustable.
The loading and unloading pressure of the air compressor has an upper and lower limit, that is, the loading pressure and unloading pressure range can not be less than 0.08MPA, smaller than this range you can not adjust.
For fixed-frequency air compressor loading and unloading pressure is best to keep in the range of 0.1MPA.
If the pressure you need is 0.7MPA, then your loading pressure can be set to 0.7MPA and the unloading pressure should be 0.8MPA
This way, your air pressure will be at least 0.7MPA, which will prevent the machine from loading and unloading frequently.
If possible, it is best to use a frequency conversion screw compressor, which can maintain a stable air pressure according to the requirements of the use, thus reducing the waste of electricity between 0.7-0.8 kilograms of pressure climb.
Expanded:
1, compared with reciprocating piston refrigeration compressor, screw refrigeration compressor has a high speed, light weight, small size, small footprint and low exhaust pulsation and a series of advantages.
2, screw type refrigeration compressor has no reciprocating mass inertia force, power balance performance is good, smooth running, seat vibration is small, the foundation can be made smaller.
3, screw type refrigeration compressor structure is simple, the number of parts is small, there is no such as valve, piston ring and other wear parts, its main friction parts such as rotors, bearings, etc., the strength and wear resistance is relatively high, and good lubrication conditions, and thus the machining is small, low consumption of materials, long operating cycle, the use of a more reliable, simple maintenance, and is conducive to the realization of the manipulation of automation.
4, compared with the speed of the compressor, screw compressor has the characteristics of forced gas transmission, that is, the exhaust volume is almost independent of the influence of the exhaust pressure, in the small exhaust volume does not occur when the phenomenon of wheezing, in a wide range of operating conditions, can still maintain a high efficiency.
5, the use of slide valve adjustment, can realize the energy stepless adjustment.
6, screw compressor is not sensitive to the inlet liquid, can be used to spray oil cooling, so in the same pressure ratio, the discharge temperature is much lower than the piston type, so the single-stage pressure ratio is high.
7, there is no residual volume, thus high volumetric efficiency.
Baidu Encyclopedia - Screw Air Compressor