SELF-SUCTION PUMP

WIPO Patent Application WO/2008/023515

A1

A self-suction pump capable of stably discharging fluid to be transferred even if the fluid becomes a mixture of gas and liquid. A liner ring (50), which is in rubbing contact with an impeller (29) when it moves to the front side during its rotation, is provided at a circular plate section (26b), at a position on the rear side of its innermost step. In a cover member (37) of the impeller (29) provided at a position facing a front partition wall (26), a center portion (37a) of a circular plate has an opening having substantially the same size as an opening of the circular tube section (26a) of the front partition wall (26). The edge (37a) of the opening of the circular plate is formed in a ring shape so as to project to the front partition wall (26) side. A backflow prevention projection (37a) is inserted inside the liner ring (50) of the front partition wall (26) with a predetermined gap provided between the projection (37a) and the liner ring (50). A mouth ring (51), which comes into rubbing contact with the liner ring (50) when the impeller (29) moves to the front side, is provided on the cover member (37), at a position facing the liner (50).

KURIHARA YASUMASA (JP)

PCT/JP2007/064256

February 28, 2008

July 19, 2007

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IWAKI CO LTD (JP)
KURIHARA YASUMASA (JP)

F04D9/02; F04D13/02

JP2632132B2	1997-07-23
JP2000227086A	2000-08-15
JPH08121384A	1996-05-14
JPS6436599U	1989-03-06
JP3499743B2	2004-02-23
JP2002257081A	2002-09-11
JP2005048675A	2005-02-24

ITAMI, Masaru et al. (2-5 Kanda-Surugadai, Chiyoda-k, Tokyo 62, JP)

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