Effects of Head Gaps and Rotor Gap on Flow Rate and Hydraulic Leakage of a Novel Non-Contact Rotor Blower

Abstract

The Roots blower belongs to the non-contact rotor pump family, therefore, there are always certain clearances between rotors and clearances between the rotor and the stator. These clearances have serious effects on the working performance of blower. Therefore, to determine the design error and the method of machining to achieve the lowest price, required machining technology, flow rate and pressure, the determination of leakage flow rate and pressure through the head gap and rotor gap is very necessary. Thus, in this paper, the authors conduct to build a mathematical model in order to determine the flow rate and pressure of blower in the ideal case in which there is no clearance and the case in which there are clearances. On that basis, the authors aim to evaluate the impact of head gaps and rotor gap on flow rate and pressure leakage. In order to improve the working performance of blower and to choose the machining method that is suitable for the applications of this blower.

Effects of pressure angle on uneven wear of a tooth profile of an elliptical gear generated by ellipse involute

“…JianGang Li et al 6 utilized a generating gear in the shaping process on the EDM machine for manufacturing non-circular planetary gearing system of the hydraulic motors etc. In the field of designing the elliptical gear train, there are two following main trends: (1) Design of centrode of the gear pair with rotation center located at the foci [4][5][6][7][8][9][10][11][12][13] or the center of the ellipse [14][15][16] ; (2) Design of gear profile by (a) Using improve cycloid and cycloid curves as tooth profiles of non-circular gears in the rotor design of Roots-type volumetric hydraulic machines [17][18][19][20][21][22][23] ; (b) Using generating trapezoidal 12,14 or circular-arc rack cutters 13 ; (b) Using generating shaper cutter 24 . When generating by the rack cutter, most of the research focused on the application involute of a circle.…”