Importance of Maintenance of Main Engine of Jinan Screw Air Compressor1.螺杆、主机外壳及高、低压端加工精度高。精度保证了主机装配后，螺杆与螺杆之间、螺杆与主机壳体之间有适当的间隙。间隙大小充分考虑了主机高温运行时螺杆和壳体的变形。
1. The processing accuracy of screw, main engine housing and high and low pressure end is high. The accuracy ensures that there are proper clearances between the screw and the screw, and between the screw and the shell of the main engine after assembly. The clearance size fully considers the deformation of the screw and shell when the main engine runs at high temperature.
2. According to the technical requirements of the screw assembly, ensure the clearance size between the screw and the high and low pressure end face. When the main engine is running, the screw does not move axially, and the high precision bearing ensures the allowable radial displacement of the screw.
3. Oil film formed by lubricating oil during normal operation of compressor head prevents screw from directly contacting with screw. However, with the increase of screw air compressor operation time, the bearings of the main engine will inevitably wear, resulting in the increase of screw axial movement and radial displacement. This change will change the clearance between the screw and the screw, between the screw and the main body shell, as well as the front and rear end faces. These clearance changes are normal and permissible for the life of bearings, and the resulting gas production attenuation of screw air compressors and the increase of main motor load are also normal and permissible. With the indirect overhaul period near the engine head during the unit operation, the service life of the main engine bearing is gradually approaching the maximum allowable service life. At this time, the axial and radial momentum of the screw approached the maximum allowable value of the design gradually. This change will lead to great changes in the clearance between the screw and the screw, between the screw and the main body shell, and between the front and rear end faces. At this time, although the operation of the main screw air compressor is still safe, it has taken into account the planned overhaul of the main engine. Because once the unit's operation time exceeds the overhaul period, the main engine with bearing wear and matching clearance will reach the main engine with the technical conditions allowed by the limit value. At this time, the main engine is in an unsafe operation state, and the following serious consequences may occur at any time.
4. The increase of operating load of screw air compressor, head screw between main motor and electrical system, head screw between screw air compressor, screw and end face, friction between screw and possible powerful main engine shell make the running load of main engine increase sharply, and the running load of badly worn bearings is very large. This will make the motor in an overloaded working state, seriously endangering the safe operation of the motor. If the situation is serious, if the screw air compressor electrical protection device response is not sensitive or failure, it may also lead to motor burnout.
5. Air compressor exhaust will have a greater attenuation, screw air compressor head clearance increase will lead to a serious reduction in the efficiency of the main engine, that is, screw air compressor exhaust attenuation is larger, which has a certain impact on the normal production of the unit. Especially for a small number of users with abundant exhaust configuration of screw air compressor, due to attenuation and relatively stable exhaust system of gas air compressor, pipeline network will reduce a large amount of compressed air pressure, increase unit noise, temperature and gas system equipment may not work or can not work properly, affecting the normal production of the device or causing temporary closure, resulting in losses.