Screw rotor and vacuum pump
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
Feb 22, 2007
app pub date -
Aug 22, 2006
filing date -
Aug 22, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention provides a low-cost screw rotor that is capable of compressing gas. As exemplified in FIG. 4, screw rotors (26, 27) comprise: upstream screw section (43a) defined on the upstream side of the gas travel path with screw thread (41a) identically positioned at the same interval, and downstream screw section (43b) connecting to the downstream side of upstream screw section (43a) along the gas travel path, where threads (41b) on the downstream screw section are arranged continuously with identical pitch smaller than threads (41a) on the upstream screw section; and the upstream end of the downstream screw thread (41b) along the gas travel path and the downstream end of upstream screw thread (41a) along the gas travel path are continuously connected at a yielding point (43c).
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