Small horizontal scratches on the piston rod of the reciprocating compressor
Thread Content
After replacing the piston rod, packing, and support ring, leakage was detected as soon as pressure was applied; upon further disassembly, cracks were found on the piston rod
The last edit to this post was made by Frozen Desert on 2019-11-7 at 13:51; horizontal lines appeared at the three contact points of the oil scraper ring, the seal ring, and the main seal. There is no raised sensation when touching back and forth with the fingers, but a depressed sensation is felt when sliding with the fingernails in an axial direction. What is the cause of it?
The packing is too tight; it should be able to move somewhat within the packing chamber
Lubrication: with oil or without oil; presence of impurities in the material
Have the oil scrapper ring, support ring, and packing been checked? Is the clearance appropriate?
The filler gaps are all limited to over 40 layers at most
Compressor packing and pump packing are not the same thing; not only are the types of packing different, but the methods of installation also vary. In compressors, the packing ring is usually held in place by springs, which use their elastic force to press the inner ring against the shaft. The pump packing is a solid plug, which is then tightly compressed with a gland.
1. The filler has lubrication or not. 2. Inspection of the filler gland clearance 3. Quality of piston rod surface treatment
I asked a teacher who specializes in installation yesterday, and he said it might be that some part of the piston is stuck, which causes the piston to move in a jerky manner during its back-and-forth motion, resulting in vibrations in the piston rod.
1. Defects in the surface treatment of the piston rod. 2. High temperatures are generated due to the relative movement between the packing, the oil retaining ring, and the piston rod. Check the material of the packing as well as the surface treatment of the piston rod; if the packing gap is large, use shims with a smaller inner diameter to fit around the piston rod. Also, determine what the clearance is at the openings on the shaft where the packing, sealing ring, and tangential ring are fitted. After the piston rod is installed, turn the shaft to measure the axial runout. Check whether the packing cooling water is blocked, and monitor the temperature at the packing area during operation to see if it is high