Fault decomposition and solution of air compression equipment
When the cylinder head bolt is loose or the pre-tightening force is insufficient, a gap may occur between the cylinder head, the cylinder head gasket and the cylinder block to leak air. At this time, the cylinder head nut should be evenly tightened in the order and torque. The piston ring is severely worn. If the lubrication is poor or the air filtration effect is not good, the piston ring will be seriously worn prematurely, and the opening gap of the piston ring will become large, so that the gas in the cylinder leaks too much into the crankcase, resulting in insufficient exhaust gas and exhaust. The pressure is reduced. If the piston ring is found to be excessively worn, it should be replaced in time.
When replacing the piston ring, note that the openings of the adjacent rings should be staggered from each other. The position of the opening should also avoid the direction of the pin hole of the piston and the direction perpendicular to the pin hole of the piston to reduce leakage. The quality of the lubricant is not good or lacks oil. Poor quality of the lubricant may cause the piston ring to stick and reduce the amount of exhaust. Lack of oil means poor lubrication, which will accelerate the wear of cylinder liners, pistons, piston rings and other parts, resulting in increased clearance, poor sealing performance, and reduced exhaust pressure and displacement. The Air Filter is clogged. When the air filter is clogged, the intake resistance increases and the intake and exhaust volumes are reduced.
With a loose slip. At this time, the air compressor speed is lowered, resulting in a slow rise in air pressure. Other aspects of the failure. For example, the pipe joint or somewhere in the pipeline leaks, the valve seat is loose, the valve spring is broken, and the pulley and the crankshaft are relatively slippery. The method of judging the fault location shall be judged according to the principle of simple and complex, from easy to difficult, and by the principle of the table and the inside. Check if the pulley and crankshaft of the air compressor are rotating normally.
Check for leaks. If the pressure gauge is still low after the engine has been running for a few minutes, it should be checked and eliminated in time. If you hear a clear "world" leaking sound near the valve, you can preliminarily conclude that the valve and valve seat are closed. strict. If the air pressure drops rapidly after stopping, you can check the pipeline, pipe joint, cylinder block and cylinder head by means of watching, listening or applying soapy water to determine the leaking part. If there is abnormal noise such as tapping when the air compressor is running, there may be a large clearance between the big end of the connecting rod and the crankshaft, a large clearance between the piston pin and the piston or the connecting rod, and a matching clearance between the piston and the piston ring. Too large or damaged bearings. At this point, the inspection should be disassembled.
If the temperature of the cylinder head and the exhaust pipe is too high, it is likely that the exhaust valve is not closed tightly, and the discharged high-temperature gas will return to the cylinder. Observe the airflow at the air cleaner inlet. If the air inlet is always in the air intake state, it can be confirmed that the air filter has no problem. If the air filter has little or no air intake, it may be that the filter element is clogged. If the air inlet is continuously in and out, it may be The intake valve is not tightly sealed.
Finally, according to the results of the preliminary judgment above, the suspected part is inspected. Check the respirator. If the respirator is always venting outward without inhaling inward, or if the inspiratory volume is small, disassemble and check to see if the vent valve is stuck. If the exhaust valve is normal, it may be that the piston, piston ring and cylinder are excessively worn or the piston ring is facing. At this time, the suspected part should be further disassembled and inspected. Check the air outlet pressure of the air compressor.
Remove the exhaust pipe and belt on the air compressor, block the exhaust port with your fingers, turn the pulley on the air compressor with the other hand, or remove the belt, let the air compressor run at low speed, if you feel the finger The exhaust pressure is small, it can be initially determined that the air compressor is faulty, and then the fault location is found by other means. If the pressure of the finger is high, the exhaust gas can be heard. Sound, it can be roughly confirmed that the fault location is not in the air compressor itself, at this time should look for the cause from other aspects.
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