Patent ID: 6236897
Filing Date: 2001-05-22
Classification: F01C,F04C

Abstract:
A method of manufacturing casing curved surfaces for eccentric rotor vane pumps, wherein the cardiocle curvature of the casing in a springless eccentric rotor vane pump can be represented over the range 0.degree..ltoreq..theta..ltoreq.180.degree. asX.sup.2 +Y.sup.2 ={2r+L (2R-r+L )+(R-r)sin .theta.-R.sup.2 +L -(R-r+L ).sup.2 +L cos.sup.2 +L .theta.}.sup.2,P=2r+L (2R-r+L )+(R-r)sin .theta.-R.sup.2 +L -(R-r+L ).sup.2 +L cos.sup.2 +L .theta.##EQU5##andX.sup.2 +Y.sup.2 =(R.sup.2 +L -(R-r+L ).sup.2 +L cos.sup.2 +L .theta.-(R-r)sin .theta.).sup.2, orP=R.sup.2 +L -(R-r+L ).sup.2 +L cos.sup.2 +L .theta.-(R-r)sin .theta.,where X and Y are Cartesian coordinates, r denoites the radius of the rotor, R denotes the radius of the basic circle, .theta. denotes the rotation angle of the rotor or vane, and P is a polar coordinate, whereby the above equations being implemented in the precision manufacture of the curved surface of the casing in the eccentric rotor vane pump using CNC techniques.