Patent ID: 7565742
Filing Date: 2009-07-28
Classification: F04C,Y10T

Abstract:
1. A method for designing lobe-type rotors adapted for generating a defined rotor and a conjugate rotor both having three or more than three lobes by setting suitable parameters into equations to generate a curve portion of a single lobe of the defined rotor as a pattern comprising an curve E, an arc A, an arc B, a straight line Y, an arc C, and an arc F, then imaging (N−1) copy of the curve portion in which N represents the number of lobes and is bigger than or equal to three, and then respectively rotating each curve portion in sequence from an appropriate degree computed by 360/N to a terminal degree computed by (N−1)*360/N, whereby to integrately form the defined rotor with three or more than three lobes; likewise, by way of the curve portions of the defined rotor to generate a conjugate curve portion for forming the conjugate rotor; thus the defined and the conjugate rotor intermesh and conjugate to each other; the method for designing a single lobe curve portion of the defined rotor comprising: designating a maximum radius R of the defined rotor and a width D of the defined rotor, a pitch circle radius Rp of the defined rotor and the conjugate rotor, a first center t defining a reference horizontal line h designating a second point P defining a second line h defining an arc B by drawing around the third center t designating a fourth center t defining a third line h defining an arc F by drawing around the fourth center t designating a fifth center t (wherein R and D respectively represents the maximum radius and the width of the defined rotor) defining an arc C by drawing around the center t defining the straight line Y by taking an external common tangent line of the arc C and arc B, wherein two end points of the straight line Y respectively connected to the sixth point P generating the curve portion of the single lobe of the defined rotor by linking the curve E, the arc A, the arc B, the straight line Y, the arc C and the arc F.