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US 2006/0188383 A1Published application
Vacuum pump
OwnerTadahiro Ohmiinventor
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OwnerTadahiro Ohmiinventor
Estimating the term…
A vacuum pump, comprising a pair of screw rotors having a first screw rotor with a plurality of spiral land parts and a second screw rotor with a plurality of spiral groove parts and rotating about two axes substantially parallel with each other while engagement with each other, a casing storing the pair of screw rotors, and a pair of bearings installed on a pair of shafts (4) supporting the pair of screw rotors. The vacuum pump is characterized in that a pair of shaft seals (5) in non-contact with the pair of shafts (4) are installed between the pair of screw rotors and the pair of bearings, and each of the pair of shaft seals (5) is of a static pressure type and leads seal gas through a shaft seal portion.
A vacuum pump comprising a pair of screw rotors having a first screw rotor with a plurality of helical land portions and a second screw rotor with a plurality of helical groove portions and adapted to rotate about two axes substantially parallel to each other while engagement with each other, a casing receiving therein said pair of screw rotors, and a pair of bearings provided on a pair of shafts supporting said pair of screw rotors, said vacuum pump characterized in that
A vacuum pump comprising a pair of screw rotors having a first screw rotor with a plurality of helical land portions and a second screw rotor with a plurality of helical groove portions and adapted to rotate about two axes substantially parallel to each other while engagement with each other, a casing receiving therein said pair of screw rotors, and a pair of bearings provided on a pair of shafts supporting said pair of screw rotors, said vacuum pump characterized in that
Dependencies are inferred from the claim text.