When using oil-free air compressors in daily life, we will encounter the problem of water leakage in the packing assembly of oil-free air compressors. Let's analyze it today to see what causes it. Common phenomena of water leakage in the gas seal assembly of oil-free air compressors are: water leakage or seepage along the bolts that fix the gas seal outside the gas seal housing; water leakage or dripping along the tie rod inside the gas seal.
1. The reason for water leakage outside the gas seal assembly housing due to water leakage or dripping along the bolts that fix the gas seal outside the gas seal assembly housing is due to the aging of the O-ring at the lower end of the gas seal assembly. The seal is not tight, causing cooling water to leak. At this time, if the scraper ring is damaged or the seal is not tight, it is possible that the cooling water will flow into the oil pan along the tie rod, causing the engine oil to emulsify, which may cause accidents such as crankshaft locking and burning of the bearing in severe cases. In work, it is generally used to replace the appropriate O-ring to solve this kind of problem.
In addition, cylinder casting defects are also one of the reasons for water leakage outside the gas seal assembly housing. Due to the aging of the cylinder or the reasons of casting, the cylinder may be damaged, cracked or sand hole, which may also cause water leakage outside the shell of the oil-free air compressor gas seal assembly.
To deal with such problems, specific analysis and specific treatment are required. Under normal circumstances, the cylinder can be repaired or replaced by welding. For the repaired cylinder, a water pressure test must be carried out to ensure the safety of the cylinder.
2. Water leakage inside the gas seal assembly caused by muddy water or seepage along the tie rod is not common, but the reasons are relatively complicated. The main manifestations are: water flowing or dripping along the compressor tie rod. When the leakage is serious, if the scraper ring is damaged, the cooling water may enter the oil pan, causing the same serious consequences as mentioned above. Common reasons are as follows:
(1) The gasket at the connection between the upper end of the gas seal assembly shell and the cylinder body is aging or the gasket is thin, resulting in poor sealing, allowing cooling water to enter the cylinder. This phenomenon is more obvious when the piston moves downward. When dealing with such problems, the common method is to replace the gasket. When replacing the gasket, it is better to use a depth gauge to measure the size of the cylinder body and the top of the gas seal assembly shell. According to the data, determine to add a suitable gasket. If necessary, you can also apply a layer of polymer sealant to increase its sealing effect.
(2) Damage to the cylinder bed or poor sealing is also one of the reasons for the leakage of the gas seal assembly. When the cylinder bed is damaged or the cylinder head bolts are not tightened according to the specified torque, it will also cause the cylinder body to leak. During the operation of the piston, cooling water may enter the gas seal along the piston rod, causing leakage. For such problems, more attention should be paid. If the cylinder bed leaks seriously, it may cause the piston to pull the cylinder, or even cause serious accidents such as cylinder pushing. The way to deal with this kind of problem is to replace the cylinder bed or retighten the cylinder head bolts according to the specified torque.
(3) Damage, sand holes, cracks, etc. in the gas seal assembly shell can also cause the gas seal assembly to leak. Since the shell of the gas seal component is in contact with the cooling water for a long time, the cooling water temperature is high when the oil-free air compressor is working; when the compressor is not working, the water temperature is low. This alternating change in water temperature can easily cause scale to form on the shell of the compressor gas seal component. In severe cases, "cavitation" may occur, causing perforation of the shell. In particular, some weak places such as sand holes and pores caused by casting defects are more likely to be damaged, cracked or perforated, which may cause cooling water leakage. This will cause oil emulsification, resulting in accidents such as crankshaft strain and tile burning. To deal with such problems, the shell of the gas seal component should be repaired or replaced in time.
Although water leakage of the packing component of the oil-free air compressor is not common, once it occurs, it will often bring serious consequences to the oil-free air compressor. Especially for those oil-free air compressors that have been in disrepair for a long time, due to aging equipment, the gas seal component is more likely to leak. Therefore, it is very necessary to conduct regular inspections on these oil-free air compressors to be prepared for any eventuality.
In recent years, we have dealt with many similar problems. When dealing with such problems, we usually work with the operators, check the equipment operation records, and make correct analysis and judgment based on the equipment operation conditions. Having learned from past lessons and made adequate preparations, we conducted targeted routine inspections on the oil-free air compressor gas seal components during this year's equipment maintenance work, and discovered a similar problem in time. Due to proper handling, some unnecessary troubles were avoided.