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Patent Searching and Data


Title:
MULTI-STAGE ROOTS PUMP AND MULTI-STAGE PUMP
Document Type and Number:
Japanese Patent JP2000170679
Kind Code:
A
Abstract:

To improve pressure reduction performance and reduce production cost.

The exhaust ports of pump chambers 2a and 4a on a front stage are connected to the intake ports of pump chambers 4a and 6a in order on a rear stage by communication holes 3a and 5a extended to the opposite side of a virtual face including the axis lines of shaft 9 and 10, and the communication holes 3a and 5a are provided penetrating a third and fifth cylinder blocks 3 and 5 without contacting each of shaft 9 and 10 between shafts 9 and 10.


Inventors:
GOTO KUNIFUMI
HOSHINO NOBUAKI
UCHIYAMA OSAMU
Application Number:
JP1998000345011
Publication Date:
June 20, 2000
Filing Date:
December 04, 1998
Export Citation:
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Assignee:
TOYODA AUTOMATIC LOOM WORKS
International Classes:
F04C18/18; F04C2/08; F04C18/12; F04C23/00; F04C25/02; F04C29/00; F04C29/12; (IPC1-7): F04C23/00; F04C18/18; F04C25/02; F04C29/00
Attorney, Agent or Firm:
大川 宏