Air compressor speed increaser high-speed shaft bearing high temperature analysis Ren Yuwei Yue Wanjun Zheng Shouli babbitloy layer wear, the oil wedge drain tank blocked.
Shenyang Blower Factory produces 3 elbow 0266 compressors, single-stage intake single-shaft gears. In the six-stage isothermal compressor, the 12-stage impeller is a section, the 56-stage impeller is a section, and the 34-stage impeller is a section. The section exhaust air is cooled by the intercooler and then dehydrated by the gas water separation tank, and then enters the section for compression, and is cooled by the intercooler through the intercooler, and then enters the section for compression. In the compression process of each stage, the flow rate of the gas port is 20000m3h, and the exhaust pressure is 0.95MPa. The spindle speed of the machine is 887 coffee, and the motor power is 3000.
When the elbow 5266 air compressor 1 was put into operation in September 2008, the high-speed gear shaft load end of the transmission supports the bearing temperature, the 7120 measuring point is 76, the large gear shaft end supports the bearing 07122, the 7123 measuring point and the high-speed gear shaft. End support bearing temperature, 7121 measuring point is 7 original design point bearing temperature alarm value is 85, parking value is 905 said 009 at the end of March has reached 84 feet, close to the alarm value. Taking measures such as increasing the amount of circulating cooling water and turning on the cooling tower fan can still not solve the problem of excessive bearing temperature rise.
The bearing clearance of the motor speed increaser compressor 1 is too small or uneven, the lubricating oil discharge is not enough, and the heat generated by the friction cannot be taken away in time. 3 bearing oil inlet orifice is too small, the amount of oil is insufficient, and the heat generated by friction cannot be taken away. The 3-axis lining reservoir is too small. 4 bearing casting quality is not good or the Babbitt grade is wrong, can not meet the production needs. 5 bearing temperature measurement platinum resistance is not allowed or damaged. The inlet pipe of the initial speed increaser is not smooth, and the filter is blocked by a small amount of oil. 7 Lubricating oil contains water or other impurities, and the viscosity of the lubricating oil is lowered, which affects the formation of the pressure oil film, causing boundary friction or dry friction. 8 The oil inlet temperature is high, which improves the working environment temperature of the bearing, and the bearing temperature is naturally high. 9 unit vibration.
Since the unit does not have the parking condition during operation, it is only verified that the reason for the back point is that the temperature of the bearing is measured as a double-drilling resistor, and the two temperature points are the same, so the platinum resistance of the temperature measurement can be excluded or damaged. The remaining block of the gearbox has a small amount of oil. Finally, through the full analysis of the oil quality, the moisture and impurity content meet the relevant standards. Adjust the amount of cooler water, the inlet temperature is within the standard range. The vibration of the unit meets the requirements, so these reasons can be ruled out.
Checking bearing wear After removing the bearing, it was found that the bearing was in the oil wedge bidirectional structure. The upper part of the bearing babbitt layer wears, and the oil wedge drain tank is blocked, and the temperature rise is caused by this. The sealed oil tank is enlarged and the bearing surface is finely ground to ensure sufficient oil drainage and heat removal.
Check that the bearing fit clearance is essentially zero and the allowable range of 6.659 is less than the installation value provided by the compressor manufacturer. From this, it can be judged that the bearing gap should be less than the current measured value for two months at the beginning of the operation, indicating that the initial temperature is higher than other points due to the small bearing clearance. After two months of operation, due to the poor formation of the oil film, the bearing wear caused the drain groove to gradually shrink until it blocked, causing the bearing temperature to rise.
Check the oil-increasing orifice of the high-speed shaft load end bearing of the speed increaser. By using compressed air, the speed-increasing oil inlet plate and the high-speed shaft load end orifice are purged without clogging. Re-calculation of the throttle aperture, the oil intake can meet the requirements of use.
Check the bearing casting quality and the Babbitt grade inspection bearing, the babbitt layer without cracks, the slag inclusions and burrs and other defects, the tungsten gold layer and the body fit closely, the Babbitt grade meets the requirements.
After checking and processing, the brakes are supported at 3 elbows with 266 air compressors. The high-speed shaft load end supports the bearing temperature 72, which is basically the same as the other bearing temperatures. So far, it is relatively stable, and there is no bearing temperature rise. W10.0509 Maintenance and repair equipment management and maintenance of No. 2, Petrochemical Road, Hongwei District, Liaoyang City, Liaoning Province 20105
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