Roots type blower with reduced gaps between the rotors
First Claim
1. A Roots type blower of the type comprising intermeshing rotor means including a rotor whose shape constitutes a reduction from an original theoretical base shape, said reduction comprising a combination of primary and secondary reductions, said primary reduction being uniform around the rotor periphery, said secondary reduction being variable along an outer periphery of said rotor in accordance with a cross-angle defined by the intersection of a first line extending normal to a point on said periphery and a second line extending to said point from an axis of rotation of said rotor, such that the secondary reduction is smallest at locations where said cross-angle is zero and becomes larger between said locations.
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Accused Products
Abstract
A Roots type blower wherein a secondary gap distance for rotor is determined in accordance with a cross angle between a normal line at a point of the outer periphery of theoretical base curve of the rotor and a line extending through said point and the rotor center.
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Citations
10 Claims
- 1. A Roots type blower of the type comprising intermeshing rotor means including a rotor whose shape constitutes a reduction from an original theoretical base shape, said reduction comprising a combination of primary and secondary reductions, said primary reduction being uniform around the rotor periphery, said secondary reduction being variable along an outer periphery of said rotor in accordance with a cross-angle defined by the intersection of a first line extending normal to a point on said periphery and a second line extending to said point from an axis of rotation of said rotor, such that the secondary reduction is smallest at locations where said cross-angle is zero and becomes larger between said locations.
Specification