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Patent Searching and Data


Title:
VACUUM PUMP
Document Type and Number:
Japanese Patent JPH05172091
Kind Code:
A
Abstract:

PURPOSE: To increase pumping speed at vortex pump stages by utilizing the form of a rotor finished into a straight cylinder having blades engraved in the outer peripheral surface thereof and having no projection.

CONSTITUTION: A number of thread grooves 7 each having an angle of inclination of 20 degrees or so and a rectangular cross section and communicating recessed portions 4, 4 located at upper and lower stages and compressing air from the upper stage toward the lower stage of an exhaust passage 3 are provided in the outer peripheral portion of a rotor 2 and pumping speed is increased by utilizing both air exhausted by the thread grooves 7 and air spirally exhausted by a blade 5 extending along the circumferential direction of the exhaust passage 3.


Inventors:
YAMAMOTO TAKASHI
Application Number:
JP34315591A
Publication Date:
July 09, 1993
Filing Date:
December 25, 1991
Export Citation:
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Assignee:
DAIKIN IND LTD
International Classes:
F04D19/04; F04D23/00; (IPC1-7): F04D19/04; F04D23/00
Attorney, Agent or Firm:
Naohisa Tsuda