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US 5,567,140 AGranted
Keyed insert plate for curved rotary lobe pump chamber walls
AssigneeITT Corporation
InventorIan Dodd
Life of this patent
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AssigneeITT Corporation
InventorIan Dodd
Estimating the term…
A rotary lobe pump comprises a pump housing defining an obround pump chamber and a pair of lobe rotors in the pump chamber. The rotors are mounted on rotatable shafts which are connected by timing gears such that the rotors rotate to cause a fluid to displace through the chamber. The pump chamber is defined in the pump housing by opposed front and rear end walls which are perpendicular to the axes of the rotors and by arcuate side walls with which the rotors make sealing contact and which gradually wear out thereby reducing the tightness of the seal and thus the pumping efficiency of the rotary lobe pump. The rear end wall includes two removable end wear plates which each include a rearwardly projecting key engaged in a corresponding keyway defined in the pump housing with bolts extending from outside of the housing inwardly towards the end wear plates and engaging the keys thereof for securing the end wear plates to the housing. The arcuate side walls take the form of removable curved wear plates which are each semi-cylindrical in shape and which each include an outwardly directed radial curved key which is engaged in a corresponding curved keyway defined in the housing. Bolts which extend through the housing into the keys retain the curved wear plates in position in the pump chamber. The rear ends of the curved wear plates are supported by the peripheral edges of the end wear plates.
A curved wear plate for use in a rotary lobe pump of the type comprising a pump housing, a pump chamber defined in the housing and having input and output ports provided in a side wall of the pump chamber, a pair of rotors rotatably mounted in the pump chamber and having a continuous rolling sealing contact with each other, the rotors having parallel axes of rotation, the pump chamber also having end walls perpendicular to the axes and the side wall, the side wall of said pump chamber being adapted to removably receive said curved wear plate at locations in the pump chamber where peripheral surfaces of the rotors are required to make sliding sealing contact, said curved wear plate defining a smooth inner arcuate surface where said sealing contact with a respective rotor occurs, said curved wear plate comprising an arcuate key means projecting outwardly of an outer surface of said curved wear plate, said key means being adapted to be removably engaged in a corresponding keyway means defined in the pump housing and comprising mounting means for removably securing said arcuate key means and thus said curved wear plate to the pump housing.
A rotary lobe pump comprising a pump housing, a pump chamber defined in said housing and having input and output ports provided in a side wall of said pump chamber, first and second rotors rotatably mounted in said pump chamber, said rotors having parallel axes of rotation, said pump chamber also having end walls perpendicular to said axes and said side wall, said rotors making continuous rolling sealing contact with each other and peripheral sliding sealing contact at the periphery thereof with at least part of said side wall, said side wall comprising first and second curved wear plates removably mounted to said pump housing in said pump chamber at locations of said side wall where said first and second rotors respectively make said peripheral sliding sealing contact, said first and second curved wear plates each comprising an arcuate key means projecting outwardly into said pump housing, said key means being removably engaged in a corresponding keyway means provided in said pump housing, said key means and keyway means extending in the direction of rotation so as to resist movement of the curved wear plates in the axial direction, mounting means being provided for securing said key means of each said curved wear plate to said pump housing, said key means and keyway means extending in the direction of rotation so as to resist movement of the curved wear plate in the axial direction.
Dependencies are inferred from the claim text.