Rotary blower with an abradable coating
AssigneeEaton Corporation
InventorsAndrew W. Suman, Matthew G. Swartzlander
Life of this patent
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Abstract
An improved rotary blower (11) with an abradable coating (61) with a maximum hardness value of 2H on a pencil hardness scale. The coating material is a blend or mixture of preferably an epoxy-polymer resin matrix with a solid lubricant. The solid lubricant preferably is graphite. The improved abradable coating provides essentially zero clearance to increase the volumetric efficiency of a Roots type rotary blower.
Claims21
In a rotary blower having a pair of meshed, lobed rotors, the improvement comprises an abradable coating on at least a portion of at least one of the lobed rotors for providing an essentially zero operating clearance for increasing a volumetric efficiency of the rotary blower, said abradable coating being a mixture of a coating matrix and a solid lubricant, said coating matrix having a VOC of less than or equal to about 0.5 lb/gal, said abradable coating having a maximum hardness value of approximately 2H on the pencil hardness scale, and said abradable coating having a temperature stability of up to about 400° F.
In a rotary blower having a pair of meshed, lobed rotors, the improvement comprises an abradable coating on at least a portion of at least one of the lobed rotors for providing an essentially zero operating clearance for increasing a volumetric efficiency of the rotary blower, said abradable coating being a mixture of an abradable powder coating matrix and a solid lubricant, said coating matrix having a VOC of less than or equal to about 0.5 lb/gal, said abradable coating having a maximum hardness value of approximately 2H on the pencil hardness scale.
In a rotary blower having a pair of meshed, lobed rotors, the improvement comprises an abradable coating on at least a portion of at least one of the lobed rotors for providing an essentially zero operating clearance for increasing a volumetric efficiency of the rotary blower, said abradable coating being a mixture of a coating matrix and a solid lubricant, said abradable coating having a maximum hardness value of approximately 2H on the pencil hardness scale, said abradable coating having a particle size greater than 10 microns, and said coating matrix has a VOC of less than or equal to about 0.5 lb/gal.
Dependencies are inferred from the claim text.