Reasons for high exhaust temperature of air compressor

1. The air valve is leaking and the piston ring is worn too much. If the valve plate of the air valve is broken and the valve spring fails, it will cause the seal to be loose. In addition, the installation is not in place, the air valve is tilted, and the top rod plate on the valve cover is tight. The valve also causes the valve to leak and compressed air flows directly from the valve seat seal. Inhalation leakage will reduce the intake air volume, increase the temperature in the cylinder, and increase the exhaust temperature; exhaust valve leakage will reduce the exhaust and intake air volume, and cause the compressed gas to flow back, so that the cylinder The temperature rises and the exhaust temperature rises. The wear of the piston ring or the fracture of the piston ring will make the sealing effect of the air compressor worse. The gas on the compression side will leak into the suction side through the piston ring, causing air leakage inside the cylinder block, heating the cylinder block, and increasing the exhaust temperature.

2. The equipment is rusted. When overhauling the air compressor, it is found that there is a thick layer of rust and a large amount of rust in the corners on the intermediate cooling partition plate of the air compressor, and the partition plate is broken. When the air compressor is started, these rust are extremely easy to enter the air valve, causing the valve plate to tilt, the spring to be damaged, and the sealing is not tight and leaking, which will inevitably lead to the exhaust temperature rise. Because the compressed medium air is a non-pure gas containing oil, water and other components, the cylinder is cast iron, and the middle cooler is ordinary steel plate. The material is easy to rust under water gas erosion. After the air compressor stops, the temperature difference between the cooling water and the cylinder body is large, and it is easy to condensation. The condensed water formed cannot be evaporated in time, which will cause the inner wall of the cylinder body to rust. In addition, the cylinder head gasket is not strict, and the cooling water system is not strict, which causes water to enter the free body and also causes the cylinder body to rust.

3. Scaling and water accumulation of equipment. During equipment maintenance, it was found through the disintegration of the air compressor that there were scale and silt in the water jacket of the middle cylinder of the secondary cylinder. The scale and silt reduced the heat exchange effect. The blockage of the intercooler tube bundle reduced the cooling water flow, reduced the effective cooling area and reduced the cooling effect. The cooling water of the aftercooler is not discharged in time, causing excessive water accumulation, causing the secondary exhaust of the air compressor to be affected. After the hot air enters, the heat exchange effect of the cooling core fins is reduced, causing the secondary exhaust temperature to rise.

4. The hot air of the intercooler is short-circuited due to the cracking of the welding seam of the middle cooling baffle, which causes the air to be short-circuited and enters the secondary cylinder without sufficient cooling. The secondary intake air temperature is too high, so that the secondary temperature rise too fast.