Title:
自吸式遠心ポンプ装置
Document Type and Number:
Japanese Patent JP3924730
Kind Code:
B2
Abstract:
PCT No. PCT/JP97/00857 Sec. 371 Date Jan. 22, 1999 Sec. 102(e) Date Jan. 22, 1999 PCT Filed Mar. 17, 1997 PCT Pub. No. WO98/04833 PCT Pub. Date Feb. 5, 1998The invention provides a self-priming centrifugal pump capable of sucking up and pumping a highly viscous liquid containing muddy substances including a large amount of bubbles, and solid foreign matters, of preventing the flow of the liquid from the side of a main pump unit into a vacuum device and from the vacuum device into the main pump unit at all stages of operation including starting, operating and stopping stages and of perfectly automatic operation, and very economical in costs of equipment and maintenance. The self-priming centrifugal pump has a main pump unit for pumping a liquid, an auxiliary pump unit for centrifugal gas-liquid separation, and an exhaust vacuum device. A region in the vicinity of a central part of an impeller included in the main pump unit is connected via a passage having a small passage area as compared with the discharge ability of the auxiliary pump unit to the suction opening of the auxiliary pump unit, the discharge opening of the auxiliary pump unit is connected to the suction opening of the main pump unit by a return passage, and a region in the vicinity of a central part of the impeller of the auxiliary pump unit is connected via an exhaust passage to the vacuum device. The exhaust passage includes in series therein a slow-acting valve which opens with a delay after the connection of a prime mover for driving the self-priming centrifugal pump to a power source, and a quick-acting valve which closes immediately after the disconnection of the prime mover from the power source.
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Inventors:
Hiroshi Yokota
Yokota Shingo
Yokota Shingo
Application Number:
JP50867598A
Publication Date:
June 06, 2007
Filing Date:
March 17, 1997
Export Citation:
Assignee:
Hiroshi Yokota
Yokota Shingo
Yokota Shingo
International Classes:
F04D5/00; F04D7/04; F04D9/04; F04D15/00
Domestic Patent References:
| JP40003655B1 | ||||
| JP57097198U |