| 摘要 |
PROBLEM TO BE SOLVED: To provide a feed water pump device excellent in operability without requiring to consider the water quantity and time for exhaust regardless of the distance to a water source and preventing sediment and the like on a water bottom of the water source from rising at an exhaust time.SOLUTION: An auxiliary tank 1b with an upper surface-opened water discharge port 1c is provided inside a water tank 1 with an exhaust hole 1a. A first changeover valve 4, a water pump 6, and second and third changeover valves 7, 8 are provided between the water discharge port 1c and a feed water pipe 2 serially from the water discharge port 1c side to form a water supply channel 2. A fourth changeover valve 12 is provided between the first changeover valve 4 and a water source to form a water absorption channel 13. A return water channel 14 is formed between the third changeover valve 8 and an opening surface of the auxiliary tank 1b. An ejector pump 15 is provided between the other port of the second changeover valve 7 and the middle of a third water channel 19 to form a first water channel 16. A second water channel 18 is formed between the middle of the second water channel between the first changeover valve 4 and the fourth changeover channel 12 and the middle of a flow channel in the ejector pump 15. The third water channel 19 is formed between the fourth changeover valve 12 and the water tank 1. |
