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| Optical deflection/scanning apparatus |
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| Slip ring unit with a printed circuit board |
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| Electrical drive systems |
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| Multiphase brushless AC electric machine |
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| Rotor for electric motor |
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| Permanent magnet electric motor having reduced cogging torque |
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| Electronically switched reluctance motor |
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Submersible pump
| Details |
Inventors: Arakawa, Shinichiro;
Assignee: Ebara Corporation (Tokyo, JP)
Primary Examiner: Smith; Leonard E.
Assistant Examiner: Freay; Charles G.
Attorney, Agent or Firm: Armstrong, Nikaido, Marmelstein, Kubovcik & Murray
A submersible pump comprising: a discharge casing open at the bottom thereof; a motor case fixed inside the discharge casing and containing therein a motor for driving an impeller; a support plate positioned so as to close an opening of the discharge casing for supporting the motor case; a downwardly concaved pump casing placed under the support plate for defining a pressure chamber between it and the support plate; and a downwardly concaved strainer placed under the pump casing for defining a suction chamber between it and the pump casing is disclosed. In this submersible pump, the discharge casing has an increased-diameter stepped flange integrally formed along the periphery of the opening of the discharge casing. Within a stepped portion of the stepped flange there are sequentially mounted respective peripheral portions of the support plate, of the pump casing, and of the strainer. The discharge casing and the support plate are fastened together by first bolts vertically extending therethrough, and in that the support plate, the pump casing and the strainer are fastened together by second bolts vertically extending therethrough. By this arrangement, the entire pump can be easily assembled by fastening the first and second bolts. |
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DETAILED DESCRIPTION An object of the present invention is, therefore, to overcome the above-mentioned problems associated with the prior art by providing a submersible pump which has of a particularly simple structure and may be readily assembled.
In order to achieve the above-mentioned object, a submersible pump according to one aspect of the present invention comprises: a discharge casing open at the bottom thereof; a motor case fixed inside the discharge casing and containing therein a motor for driving an impeller; a support plate positioned so as to close an opening of said discharge casing for supporting said motor case; a downwardly concaved pump casing placed under the support plate for defining a volute chamber between it and the support plate; and a downwardly concaved strainer placed under the pump casing for defining a suction chamber between it and the pump casing.
In this submersible pump, said discharge casing has a stepped flange of increased-diameter which is integrally formed along the periphery of the lower end opening thereof.
Within a stepped portion of the stepped flange, there are sequentially mounted respective peripheral portions of said support plate, of said pump casing, and of said strainer.
Said discharge casing and said support plate are fastened together by first bolts vertically extending therethrough.
Then, said support plate, said pump casing and said strainer are fastened together by second bolts vertically extending therethrough.
In accordance with another aspect of the present invention, a submersible pump which comprises: a discharge casing open at the bottom thereof; a motor case fixed inside the discharge casing and containing therein a motor for driving an impeller; a support plate positioned so as to close an opening of said discharge casing for supporting said motor case; a downwardly concaved pump casing placed under the support plate for defining a volute chamber between it and the support plate; and a downwardly concaved strainer placed under the pump casing for defining a suction chamber between it and the pump casing
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Generators or Motors 
