Labyrinth/Housing Fit Question
Labyrinth/Housing Fit Question
(OP)
Hi everyone,
I'm tasked with preparing manufacturing drawings of a Co2 compressor labyrinth seals,
I have a question about the required Fit(clearance/interference Fit) of compressor labyrinth seals in housing.As you see in the attached picture, labyrinth seal has an interlocking feature which secures the laby inside housing, my question is about the required fit between faces 1 to 8 on its counterpart housing surfaces. to have a sense of the size,the overall section of the labyrinth fits inside a 33mmx24mm box.
figure 1 is the drawing i have, and fig 2 is only for clarification:
http://oi57.tinypic.com/2637xw1.jpg
I highly appreciate any input.
I'm tasked with preparing manufacturing drawings of a Co2 compressor labyrinth seals,
I have a question about the required Fit(clearance/interference Fit) of compressor labyrinth seals in housing.As you see in the attached picture, labyrinth seal has an interlocking feature which secures the laby inside housing, my question is about the required fit between faces 1 to 8 on its counterpart housing surfaces. to have a sense of the size,the overall section of the labyrinth fits inside a 33mmx24mm box.
figure 1 is the drawing i have, and fig 2 is only for clarification:
http://oi57.tinypic.com/2637xw1.jpg
I highly appreciate any input.





RE: Labyrinth/Housing Fit Question
RE: Labyrinth/Housing Fit Question
Tunalover
RE: Labyrinth/Housing Fit Question
RE: Labyrinth/Housing Fit Question
RE: Labyrinth/Housing Fit Question
Having said that, the detailed design of high-performance labyrinth seals is actually quite complicated. To perform effectively the operating clearances must be extremely tight. To determine the optimum clearances, you must take into account factors such as thermal growth mismatch, shaft dynamics, and even the local fluid dynamics. Your sketch shows stepped diameters at the seal tips, which makes things even a bit more complicated.
Often, due to the difficulty in obtaining a satisfactory operating tip clearance because of factors such as tolerance accumulation, thermal mismatch, shaft dynamics, etc, a sacrificial or abradable coating is applied to the seal tip surfaces. After a few operating cycles, the coating is worn away to provide an optimum clearance.
Good luck to you.
Terry
RE: Labyrinth/Housing Fit Question
Johnny Pellin