Expansible chamber devices – Miscellaneous
Patent
1987-03-05
1988-11-08
Look, Edward K.
Expansible chamber devices
Miscellaneous
222452, B65G 4782
Patent
active
047827416
ABSTRACT:
The vaneless rotary airlock valve of this invention is designed to overcome the deficiencies of excessive leakage, excessive wear, and product degradation associated with conventional vaned rotary airlocks. It is comprised of a vaneless rotor (a cyclindrical or barrel-like container), a pair of sealing rings (one on the upstream side and one on the downstream side of the rotor), and (depending on the operating conditions) a pair of either compression or expansion rings which urge continuous sealing engagement between the sealing rings and the rotor.
Prevention of static leakage is a unique feature of the airlock of this invention, as one sealing ring is always in sealing engagement with the rotor as it revolves. The airlock may or may not permit dynamic leakage; processing gas may be bled off between the sealing rings and returned to the process, a critical feature on vacuum systems and on systems where expensive or harmful gases are used for conveying or impregnating process materials.
The airlock of this invention provides an airtight transition compartment which prevents fluid leakage from a higher pressure zone to a lower pressure zone while simultaneously conveying process material from one zone to another.
REFERENCES:
patent: 742969 (1903-11-01), Clapp
patent: 782722 (1905-02-01), Buerger
patent: 3477691 (1969-11-01), Griswold et al.
patent: 3556355 (1971-01-01), Ruiz
patent: 4009788 (1977-03-01), Waldhofer
patent: 4244705 (1981-01-01), Seidl et al.
Look Edward K.
McConnell Daniel E.
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