| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple-structured water circulation device for an artificial pond capable of reducing various expenses such as the construction cost and the maintenance cost. SOLUTION: The water circulation device comprises a solar cell 2, a pair of direct current pumps 3 and 3 operated with the electric power obtained by the solar light generation of the solar cell 2, and a controller 4 for controlling the operation of the direct current pumps 3 and 3. The controller 4 comprises an energization switching means 11 for switching the energization of the direct current pumps 3 and 3 to operate the direct current pumps 3 alternately at regular intervals, and an energization limiting means 12 for energizing one direct current pump 3 only and stopping the operation of the other direct current pump 3 when the voltage is a set value or lower. COPYRIGHT: (C)2003,JPO
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