Discussion on the installation of piston compressor couplings
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Our unit has a vertical piston compressor with an elastic plate-type coupling, and during operation, wear of the piston rod packing occurs frequently. Is there a direct relationship between the elastic coupling and the wear of the piston rod packing? The piston compressors I have come across in the past all had fixed couplings; I have never seen elastic plate couplings. I think there is a direct relationship between them; I ask experts in this field to come and discuss it. Thank you
This post was last edited and replied to by chenmin-mg on 2011-9-24 at 10:57. Reply 1# shh_Flying Immortal: There is no direct connection, and even if there were one, it wouldn’t be the main reason. Main reasons: whether the lateral gap of the packing in the packing box is too small, whether the small springs used for the packing are too tight (too short in length), whether the arrangement of components in the packing box is correct, whether the cooling water and lubricating oil for the packing flow properly, and the surface finish of the piston rod. Defects in the filler material.
The fact that your reciprocating machine uses a flexible coupling indicates that the shaft diameter is not very large. 1. Poor alignment, as well as poor shaft concentricity, can accelerate the wear of piston rings and support rings. 2. An excessively small gap between the piston rings and the cylinder block can also cause severe wear of the piston rings. 3. The poor quality of piston rings is also a factor that deserves consideration. 4. The level of the sliding shoe should also be taken into consideration.
Is it partial wear or is the entire inner cylindrical surface of the packing ring worn?
There is no direct connection. Our unit also uses vertical piston compressors, whose couplings are of the spring plate type as well. During operation, issues such as abnormal wear of the piston rod packing (including uneven wear) and uneven wear of the piston rod guide bearings have occurred. The main reasons for these problems are as follows: 1. Excessive gap between the piston and the cylinder； 2. Abnormal wear or damage to the filler ； 3. Excessive clearance between the guide bearing and the piston rod ； 4. The clearance between the big and small end bearings of the connecting rod is excessive. Check them one by one.
It has nothing to do with it. Gaskets are used for an interference fit during alignment, and a proper compressor will use gaskets for compensation. A damaged packing has no connection with this; sometimes, the problem with a damaged packing is closely related to the quality of domestically produced packing.
There is no direct connection; piston rod wear should be considered from other aspects!
Reply to 4# lovestory: Hello, it’s not uneven wear; it’s cylindrical wear. Could it be that the spring force in the axial direction is insufficient? I don’t understand how such wear could occur. Thank you
The function of a coupling is to act as a connecting element that converts the rotational motion of the prime mover into reciprocating motion; it transmits energy, and has no other functions.
Reply to 8# shh_Flying Immortal: Perform a spin test on the machine, and check the movement of the piston rod to see if the vertical and horizontal movements are excessive!
Reply to 8# shh_Flying Immortal: If the packing seal wears evenly around the circumference, it means that the spring used in the packing seal does not have insufficient elasticity – rather, it has too much elasticity. Another possibility is a problem with the material itself, that is, the material is not wear-resistant. Another thing is to check, as mentioned above, whether the play of the piston rod is excessive.