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实用新型
CN205277808U 一种变齿宽变螺距的螺杆转子 失效 - 放弃

一种变齿宽变螺距的螺杆转子
摘要：
本实用新型公开了一种变齿宽变螺距的螺杆转子，属于干式双螺杆真空泵领域；从螺杆转子的一侧端面Ⅰ-Ⅰ到另一侧端面Ⅵ-Ⅵ，螺杆转子的螺距(P1、P2、P3、P4)逐渐减小，而螺杆转子的齿宽：齿顶面宽度(M1、M2、M3)和齿根面宽度(N1、N2、N3)，却逐渐增大；在任一轴向位置处，螺杆转子的轴向截面型线都包括5段曲线，依次为：圆渐开线AB、齿顶圆弧BC、摆线CD、齿根圆弧DE、摆线EA，其中齿根圆弧DE、圆渐开线AB都与摆线EA光滑连接；所提出的螺杆转子增加了低压工作腔容积、减小了高压工作腔容积、增加了内容积比、减小了螺杆长度，因此具有较高强度和良好的密封性能，提高了双螺杆真空泵的综合性能。
摘要（英）：

The utility model discloses a become screw rotor of breadth of tooth variable -pitch belongs to dry -type twin screw vacuum pump field, I - I pitch to VI - VI, screw rotor of opposite side terminal surface of a side end face (P1, P2, P3, P4) from screw rotor reduces gradually, and screw rotor's the breadth of tooth: tooth crest width (M1, M2, M3) and bottom width (N1, N2, N3), it is but crescent, in arbitrary axial position department, screw rotor's axial cross section molded lines all includes 5 sections curves, is in proper order: round gradually burst at the seams AB, tooth top circular arc BC, cycloid CD, tooth root circular arc DE, cycloid EA, wherein tooth root circular arc DE, the round AB that gradually bursts at the seams are connected with cycloid EA is smooth, the screw rotor who provides has increased low pressure working chamber volume, has reduced high -pressure working chamber volume, has increased the inner volume ratio, has reduced screw length, consequently has higher intensity and good sealing performance, has improved twin screw vacuum pump's comprehensive properties.

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