Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Plural rigidly related blade sets
Reexamination Certificate
2005-08-02
2005-08-02
Look, Edward K. (Department: 3745)
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Plural rigidly related blade sets
C415S199200
Reexamination Certificate
active
06923621
ABSTRACT:
To suppress degradation of the pump efficiency while preventing the diffuser from stalling on a turbo pumpOpening48is provided at a specified position in the cord length direction of vane42of diffuser44. Opening48communicates with the adjacent diffuser flow passage to form a flow circulating to the entrance of the diffuser via this opening48when the flow rate drops, thus to prevent stalling by increasing the apparent flow rate. The size of opening48is also adjusted in correspondence with the operating condition of said pump. The size of opening48should be adjusted to be small enough not to case stalling at the lowest flow rate expected by test operating the pump. The efficiency degradation due to the provision of the opening can be suppressed.
REFERENCES:
patent: 5178516 (1993-01-01), Nakagawa et al.
patent: 5383764 (1995-01-01), Ogawa et al.
patent: 04-143499 (1992-05-01), None
patent: 2735730 (1998-01-01), None
patent: 11-173296 (1999-06-01), None
patent: 2001-3897 (2001-01-01), None
Patent Abstracts of Japan for JP06-026496 published on Feb. 1, 1994.
Patent Abstracts of Japan for JP11-173296 published on Jun. 29, 1999.
Patent Abstracts of Japan for JP04-143499 published on May 18, 1992.
Patent Abstracts of Japan for JP2001-3897 published on Jan. 9, 2001.
Darby & Darby
Edgar Richard A.
Look Edward K.
Nikkiso Co. Ltd.
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