condesinc
Mechanical
- Apr 15, 2003
- 18
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.
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.
