To provide an immersion type pump capable of simplifying the structure of its impeller and enhancing pump performance.
The immersion type pump has impellers 3 fitted on a pump shaft at stages, each being composed of an upper plate 16 and a bottom plate 17 furnished in the center with a fitting hole 19 for fitting on the pump shaft and a liquid inlet hole 15 and a plurality of vanes 18 arranged radially between the upper plate 16 and the bottom plate 17, wherein the vanes 18 are formed rigidly on the upper plate 16 by press working. Because of single piece formation of the upper plate 16 with the vanes 18, the number of components is decreased, and operations to press the vanes 18 individually or welding to the upper plate 16 are unnecessary to lead to a reduction of the man-hours for fabricating the impellers 3. Compared with the arrangement in which the vanes 18 are welded to the upper plate 16, the root part of each vane 18 is made smooth to allow the liquid to flow smoothly between the vanes, which enhances the pump performance.
| JP5074218 | Multi-stage pump |
| JPH07103178 | NONLEAKING PUMP |
| JPS52111001 | SUBMERGED PUMPS |
NAKACHI ISAO
Yoshihide Komada
Kiyoshi Matsuzaki
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