1. Enlargement of voids
A. The interval between the Yin and Yang rotors of the main engine increases. The direct result is that the leakage (i.e. back leakage) of the compressor increases and the volume of compressed air discharged from the compressor decreases. Reflected in the power aspect is the reduction of the compact power of the compressor.
B. The increase of the gap between the Yin-Yang rotor and the back cover and the bearing will primarily affect the tightness and power of the compressor. Together, it will have a great impact on the service life of the Yin-Yang rotor, because many mechanical defects are caused by the gap between the bearing and the spindle.
2. Increased wear
As we all know, as long as there is wear in the operation of machinery, under normal circumstances, because of smooth liquid, wear will reduce a lot, but long time high-speed operation, wear is slowly increasing. Take high-end bearings for example: under almost impossible conditions (such as long time idling, smooth liquid to meet clean, cooling system to meet good, and the use of environmental temperature, humidity, etc.), it can only ensure a few years. As far as the compressor main engine is concerned, there are wear and tear of other parts besides bearings. If the correct preventive measures are not adopted for minor wear, it will simply lead to increased wear and other primary components of the damage and wear.
3. Component Deformation
The main engine of air compressor is the central part of the compressor. Its internal parts are in high temperature and pressure for a long time, coupled with high-speed operation, there must be part deformation for a long time. Together, the cause of deformation is also the use of environmental factors, and air compressor generally used in the environment will have dust and impurities, these small solid substances into the machine, baht cumulative accumulation into larger solid blocks, it is possible to form Yin and Yang rotor deformation, increase the gap, severe will lead to the main engine jam.
4. Component damage
In the main part of the air compressor, the most vulnerable parts are: gaskets, sealing rings, shaft oil seals, etc., especially the shaft oil seals, which are in high temperature, high pressure and high speed working environment for a long time, and their service life ratio is greatly shortened. The direct result of the damage is oil leakage of the compressor. If it is not found in time, the Yin-Yang rotors and bearings will be burned because of lack of smooth.
5. Cost Added
Here the cost refers to maintenance cost and power cost. Because the main engine of air compressor has not been overhauled for a long time, the wear of parts increases, and some abrasive impurities remain in the main engine chamber, which will shorten the life of smooth liquid. Together, because of impurities, the operation time of oil and gas separator core and oil filtration period is greatly shortened, resulting in the addition of maintenance cost. In terms of power cost, because of the increase of friction and the decrease of power contraction, it is bound to form an increase in power cost. In addition, the reduction of air volume and the decrease of compressed air quality caused by the main engine of the compressor will also result in the indirect increase of production cost.
Therefore, the air compressor mainframe may not be overhauled after a long period of operation, which will not only cause serious damage to the compressor itself, but also cause serious security risks. Together, it will bring severe direct and indirect economic losses to production. Therefore, it is necessary and necessary to carry out preventive overhaul of the main engine of the air compressor after a certain time of operation.
6. Discrimination and Specific Content of Air Compressor Overhaul
The general life of screw air compressor is about 30 years. However, in practice, many screw air compressors which have only been used for 10 years or even shorter are not only in poor operation, huge power consumption, constant faults and high operating costs, and many users even classify them as "waste units". At present, there are two main methods to determine the main engine overhaul in the air compressor profession:
According to the operation time of the unit, it is concluded that the total operation time of the air compressor unit reaches 20000 hours or the main engine must be arranged for overhaul after four years of operation.
According to the analysis of unit operation test, it is concluded that the operation parameters of unit such as noise, running current, operating temperature, exhaust volume and vibration of main engine are detected and analyzed to determine whether the overhaul operation of main engine is needed.