SPIRAL GROOVE TYPE VACUUM PUMP - OSAKA SHINKU KIKI SEISAKUSHO

Title:

SPIRAL GROOVE TYPE VACUUM PUMP

Document Type and Number:

Japanese Patent JPS6238899

Kind Code:

A

Abstract:

PURPOSE: To increase discharge air velocity of a spiral groove type vacuum pump by making the gap between a stator and a rotor at rest from 0.0025 to 0.0055 times the rotor diameter.

CONSTITUTION: A rotor 2 is arranged with a gap 3 within a stator 1, with the rotor having on its periphery a spiral groove 4 formed. Here the gap 3 between the stator and the rotor at rest is set from 0.0025 to 0.0055 times the diameter of the rotor 2. Accordingly, a large amount of gas can be discharged over a wide range of pressures, for example from 1 to 1,000 Pa, with improved performance.

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Inventors:

SAWADA MASA
IKEGAMI TATSUJI
IGUCHI MASASHI

Application Number:

JP17904185A

Publication Date:

February 19, 1987

Filing Date:

August 14, 1985

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