| 摘要 |
PROBLEM TO BE SOLVED: To inexpensively provide a drainage pump device having no influence of a turning flow in detecting the accuracy of a level gauge, and easy in installing work at a job site by improving an installing structure of the level gauge into a sewage tank. SOLUTION: This drainage pump device 1 has a prerotation tank 3 formed with a recess 3d for arranging a suction port 12 of a submerged pump 5 in a bottom, and is constituted so as to start draining by the submerged pump 5 when sewage inside of the sewage tank 2 becomes a prescribed water level by a level gauge 30, and generates a turning flow by the flow of the sewage when draining water by the submerged pump 5. The prerotation tank 3 is provided with a fixture 7 of a support member for supporting the submerged pump 5. The level gauge 30 is fixed in the sewage tank 2 by the fixture 7. The fixture 7 is arranged in the upper part of a partition wall 3a. The level gauge 30 is arranged in the most upstream area of the flow of the sewage. COPYRIGHT: (C)2004,JPO
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