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Design guide Help-Shaft Reverse Screw Seal

Design guide Help-Shaft Reverse Screw Seal

Design guide Help-Shaft Reverse Screw Seal

(OP)
Can anyone help me with design guidelines/calculation info for a shaft reverse screw "seal"?

Application:  Threads on a rotating shaft, comprising  "seal" or "excluder" in conjuction with the OD wall of stationary through sleeve or bore.  These are inboard of a mechanical seal.  Thread end and sleeve flush with inside of polycondensation PET reactor.  Process material on one end of reactor about 80-160 centipoise, other end about 2000-3000 poise,with near vacuum (2mm Hg)and 300 deg C in reactor.  Screw mainly to keep "drip" and pushed and tramp polymer, sliding down walls from above seal/shaft, and "rubbed around" from end of agitator, from ingressing along shaft (14"dia ) to front of mechanical seal housing.  Appears that threads on sleeve rather than shaft easiest to achive for particular application.  RPM is LOW...from 2 to 3 rpm.

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