1. Abnormal pressure
If the air volume discharged by compressor under rated pressure cannot meet the user's flow requirements, the main reason may be leakage of air valve or piston ring leakage after wear.
2. Abnormal temperature
Abnormal exhaust temperature usually means that the exhaust temperature is higher than the design value. Theoretically, the factors that affect the increase in exhaust temperature include: intake air temperature, pressure ratio, and compression index ( air compression index K=1.4). In fact, there are many factors that affect the high suction temperature, such as: low intercooling efficiency, or more scaling in intercooler , which affects heat exchange. Then the suction temperature of the subsequent stage will definitely become higher, and the exhaust temperature will also Becomes high. In addition, valve leakage and piston ring leakage will not only affect the increase in exhaust temperature, but also change the interstage pressure. As long as the pressure ratio is higher than normal, the exhaust temperature will increase. In addition, for water-cooled machine , lack of water or insufficient water volume will increase the exhaust temperature.
3. Overheating
At the friction points between crankshaft and bearings, crosshead and slide plate, packing and piston rod, etc., the temperature exceeds the specified value, which is called overheating. The consequences of overheating are: first, accelerated wear; second, overheated heat energy continues to accumulate, causing major machine accidents. The main reasons for bearing overheating are: uneven fit between the bearing and journal; bearing deflection, crankshaft bending, low viscosity of lubricating oil , oil circuit blockage, oil pump failure and oil cutoff, etc.; failure to find the proper clearance, main shaft and motor shaft during installation. Misalignment, two-axis tilt, etc.
