Maintenance of screw air compressor

Precautions for use of screw air pressure 1. Install the compressor correctly. The compressor can be installed correctly to ensure that the compressor works according to the design parameters. If the installation is not correct, it will lead to a series of problems such as high exhaust gas temperature, large vibration and abnormal sound. First, the air compressor is installed on a firm ground, and the equipment foundation is cast in C20 concrete. Install two axial fans at the 016m elevation of each air compressor inlet grille in the air compressor plant. The air flow rate of the air intake grille does not exceed 015m / s, and the design of the intake axial fan The ventilation is consistent with the air volume of the compressor fan, ensuring the smoothness of the ventilation system. In order to ensure that the pressure drop of the air in the cooling air duct does not exceed 30Pa, it is necessary to ensure that the cross-sectional area of ​​the exhaust duct from the compressor outlet is 2 to 3 times the cross-sectional area of ​​the top of the air compressor. And this ventilation duct is not necked. For other models of screw compressors, if the pressure drop of the air in the cooling air duct exceeds 30Pa, a ventilation fan should be installed at the outlet of the cooling air duct to ensure that the compressor outlet temperature is controlled within the normal range. The ventilation system of the air compressor has a discharge temperature of up to 108 °C at the initial stage of operation. The reason for the analysis is because the tree hair in the air is more in May, and the plate-fin heat exchanger is blocked, which affects the The heat transfer effect of the tone. In order to prevent the tree hair from clogging the plate-fin heat exchanger, a 60-mesh stainless steel mesh is installed at the entrance of the two axial flow fans, and the effect is very obvious. In addition, during the subsequent operation, the plate-fin heat exchanger was periodically purged, and there was no high exhaust gas temperature in the future.

2. Reasonable setting of parameters After installing the compressor, commissioning the compressor, correctly and reasonably setting the compressor's loading and unloading pressure and the number of starts per hour of the motor are the basic guarantees for ensuring the normal air supply of the compressor. In addition, reasonable setting of the loading time and the number of starts of the motor can prevent the compressor from being in the state of the big horse-drawn car for a long time. Proper installation and commissioning of the compressor can make the equipment operate in an efficient and stable state and prolong the service life of the equipment. According to the air supply requirements of the device, the designed loading pressure is 612 Bar and the load shedding pressure is 8 Bar. From the time of commissioning to the current operating conditions, this setting can ensure the normal operation of the device, especially to meet the instrument wind requirements of the cryogenic device.

3. Strengthen daily maintenance and maintenance When equipment is running, it is necessary to maintain and maintain the equipment frequently. The planned maintenance can make the compressor have the best use efficiency and prolong the service life of the equipment.

(1) Replace the lubricant in time. Lubricating oil plays a three-fold role in the oil-injected screw compressor: one is to lubricate the bearing, to increase the speed of the gear and the screw; the other is to cool the heat generated by the rotating parts during the operation. The third is to seal, so that the output air pressure is increased. Therefore, the key to ensuring the normal operation of the entire transmission system is the quality of the lubricant. Equipment manufacturers recommend the use of special lubricants to protect the screw system that is directly driven by the motor. Its special formulation guarantees the full performance of the compressor and extends the life of moving parts. At the same time, the unique formula makes it have good oil separation performance, lubrication performance, carbon deposition and excellent heat dissipation. The use of special lubricants allows the replacement of moving parts to be extended from 2000h to 4000h, saving costs. According to statistics, attention to maintenance and maintenance of lubricants can reduce the incidence of failure by 50%. If the quality of the lubricating oil is not good or the oil change is not timely, it may cause abnormality and noise of the main engine of the fuel injection screw. The air compressor has a serious carbon deposit on the surface of the screw and the bearing is damaged for a long time, which may cause the main body of the fuel injection screw to die. Therefore, be sure to change the lubricant in time. In addition, the grease of the motor should be replenished regularly. For every 2000 hours, add 15~20 Rotoglide grease to prevent damage to the motor.

(2) Prevent the motor from reversing. The reversal of the motor is likely to cause damage to the shaft, the gear is broken, and the screw may die.

(3) Clean the air filter in time. When the inlet air filter of the GA37P - 10 fuel injection screw compressor is clean, only 98% of the impurities can be filtered out, and the remaining 2% of the dust air enters the compressor. During the operation, there will inevitably be dust, water mist, acid mist, oil mist, etc. in the air. If there are many dust and impurities in the air, the inlet filter will not be cleaned in time, and the water mist and dust will combine to block the wheel. Tooth, affecting the transmission effect. The acid mist inhales the body and can corrode parts. This model is an oil-injected screw air compressor. The dust in the air comes into contact with the lubricating oil, which pollutes the lubricating oil, causing the quality of the lubricating oil to drop, affecting the lubrication of the bearing and affecting the entire transmission system.

4) Regularly check the compressor for running, running, dripping or leaking. Regularly check whether the automatic condensing drain valve is unobstructed and whether the liquid discharge is normal to ensure that the water separated from the outlet gas can be drained in time.

4. The common fault gas valve of the annular gas valve is one of the most important and most vulnerable components in the air compressor. Usually, the gas valve failure is the most important cause of the unplanned shutdown of the air compressor. Compared with air compressor components, air valves are the most sensitive, and their quality directly affects the economics and reliability of air compressor operation. Therefore, the relevant design documents and operating procedures stipulate that the valve must be regularly inspected and repaired in order to minimize the occurrence of valve failure.

The air flow speed, valve lift and spring force of the valve have a direct impact on the working conditions. The common faults of the annular valve are: (1) the sealing seat of the valve seat and the valve plate is worn to make the gas The valve generates air leakage; (2) cracks or even cracks on the valve body cause the valve to fail; (3) the valve spring loses the elastic force, causing the valve to strike severely during operation, causing the valve to be damaged in advance. Among them, gas valve fragmentation will have the most serious consequences. When the broken valve seat, valve piece and center bolt fall into the cylinder, the air compressor will crash into the cylinder. The crash cylinder will cause serious damage to the cylinder, piston, piston rod and crosshead.

How to maintain the daily maintenance items of the screw air compressor 1. Check the air filter and coolant level; 2. Check the hose and all the pipe joints for leaks; 3. Check the records, if the consumable parts have reached the replacement cycle Replace it with shutdown; 4. Check the record. When the exhaust temperature of the main engine reaches or approaches 98C, the oil cooler must be cleaned. 5. Check the discharge of condensed water. If the displacement is too small or there is no condensed water discharge, the cleaning water separator must be stopped. .

Monthly maintenance items 1. Check the surface of the oil cooler and clean it if necessary; 2. Clean the cooler; 3. Check all the wires and tighten them; 4. Clean the surface of the motor suction port and the dust on the surface of the casing; 5. Clean the oil return filter.