Vacuum pump screw rotors with symmetrical profiles on low pitch sections
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United States of America
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Apr 5, 2022
Grant Date -
Jul 11, 2019
app pub date -
Aug 8, 2017
filing date -
Aug 8, 2017
priority date (Note) -
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Abstract
A vacuum pump screw rotor, comprising at least two helical displacer elements on a rotor shaft. The at least two displacer elements have different pitches, but the pitches of each displacer element are constant. Furthermore, the displacer elements each have a helical recess, each having a contour that remains the same over its entire length. Hereby, a suction-side displacer element has a recess having an asymmetric contour, and a pressure-side displacer element has a recess having a symmetrical contour.
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