Clearance-controlling means comprising abradable layer and abrasive layer
AssigneeIngersoll-Rand Company
InventorChandi P. Biswas
Life of this patent
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Abstract
The embodiment depicted comprises a pair of coacting rotors, in a rotary compressor, having interengaging lobes and grooves, the rotors being journaled in intersecting bores in a housing. The circumferential surfaces, and end walls of the bores are polymer-layered, and the rotors carry abrasive to machine the polymer to define an optimum clearance for rotor rotation within the bores, and in coaction together. Each rotor is polymer-coated and abrasive particles are borne in the polymer on the outer edges of the lobes and in discrete radial patterns on the rotor sides. The method defines the polymer-coating and abrasive particles-deposition steps.
Claims13
Clearance-controlling means, in a machine having a rotary element, comprising:
- a machine having a housing;
- said housing having a chamber formed therein;
- said chamber having a circumferential surface bounded by a pair of spaced-apart end walls;
- a given rotor mounted for rotation within said chamber;
- said rotor having a radial lobe for sweeping about said circumferential surface in close proximity to said surface;
- and
- said surface and said lobe each having means fixed thereon cooperatively defining an interface therebetween with a single, uniform clearance;
- wherein
- said means comprises a pair of layers of material, one of said layers being fixed to said lobe, and the other being fixed to said surface;
- one of said layers comprises an abradable material, and the other of said layers comprises an abrasive material;
- said abrasive material comprises particles;
- said particles have a generally common diameter, each thereof buttressing, and being buttressed by, the others thereof;
- and
- substantially all of said particles cooperate to define a substantially uniform abrasive surface.
Dependencies are inferred from the claim text.