Rotary kinetic fluid motors or pumps – With means for re-entry of working fluid to blade set – Pump priming means
Patent
1997-02-05
1998-06-30
Kwon, John T.
Rotary kinetic fluid motors or pumps
With means for re-entry of working fluid to blade set
Pump priming means
F04D 2966
Patent
active
057723940
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention is intended to provide a self-priming centrifugal pump to be applied to automatic operative systems capable of serving for highly reliable automatic pumping and automatic water conveying in various industrial fields, having a simple construction, capable of economical operation and having high self-priming ability.
In the specification, the statement of claims and the abstract herein, "water" is a generic term for a liquid, and "air" is a generic term for a gas.
BACKGROUND ART
A conventional centrifugal pump for pumping up water is provided with a device, such as a vacuum pump, necessary only for priming. Likewise, various self-priming pumps invented to overcome disadvantages in conventional pumps of such a type are provided unavoidably with a device necessary only for priming, such as a self-priming water tank or an air separator tank.
The present invention relates to improvements in a double volute centrifugal pump disclosed in JP-B No. 28-3039 (hereinafter referred to as "first prior invention"), a self-priming centrifugal pump based on an improved self-priming principle, disclosed in JP-B No. 38-15529 (hereinafter referred to as "second prior invention"), and a self-priming double volute centrifugal pump disclosed in JP-B No. 50-21682 (hereinafter referred to as "third prior invention"). The first, the second and the third prior invention will be inclusively called prior inventions.
The centrifugal pump unit of each of those prior inventions is characterized by a common passage that serves as both a priming water circulating passage and a discharge passage during normal pumping operation, which is a distinctive feature of the pump unit of the prior invention which is not found in previously known various self-priming centrifugal pumps. However, the development of new technical ideas is necessary to obtain a pump with further improved pumping and self-priming performance.
For example, the second prior invention obtained by incorporating improvements into the first prior invention overcomes satisfactorily technical difficulties in the conventional pumps, has a simple construction, can be easily fabricated, has an expected ability and is used for various purposes. However, the second prior invention is not perfectly satisfactory because an elastic material cannot be used for forming a separating disk disposed on the bottom of the air separator chamber when the second prior invention is intended to be used for pumping a liquid of a specific quality.
If priority is given only to self-priming performance, the separating disk disposed on the bottom of the air separator chamber need not be made of an elastic material like that used for forming the separating disk of the second prior invention, and it is necessary only to form an annular passage in a sufficiently narrow width to prevent the air from- being sucked into the larger volute by supporting the bottom of a tornado-like cavity formed in the whirling currents of priming liquid. The third prior invention is provided with a "cavity support" for such a purpose. The cavity support, however, entails serious problems that the pumping performance of the centrifugal pump is deteriorated, and the centrifugal pump is blocked with earth, sand and dust etc. during pumping operation.
Although new technical improvements are found in the prior inventions, the prior inventions still have difficult problems in selecting an elastic material capable of properly serving in pumping a liquid of a specific quality or in designing the construction, and the prior inventions are hardly possible to serve as means for radically solving problems in the prior art.
Furthermore, either the second prior invention or the third prior invention is not satisfactory as a pumping apparatus or a water conveying apparatus, because a jet stream flowing from the smaller volute readily twists a current discharged from the air separator chamber serving as a diffuser for the larger volute, and tends to generate turbulent currents in the discharge pipe.
The p
REFERENCES:
patent: 2755743 (1956-07-01), Rupp
patent: 2956505 (1960-10-01), Jekat et al.
patent: 3125030 (1964-03-01), Yokota et al.
Yokota Hiroshi
Yokota Shingo
Kabushiki Kaisha Yokota Seisakusho
Kwon John T.
Yokota Hiroshi
Yokota Shingo
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