| 摘要 |
PURPOSE:To be able to prevent a pump from including air readily and return back the condition of the pump to its original one even if air is included by placing small holes at the places except a suction and a discharge hole in addition to the installation of the suction and discharge holes. CONSTITUTION:The upper end of a casing 40 in a pump 4 comes slender to form a projected discharge hole 42 and its lower end forms a suction hole 41. further,at the places except the holes 41 and 42, for example, on a part of the periphery of blades 44 in the casing 40, small holes 46 are placed. At the same time when the pump 4 is thrown into hot water, air in the pump 4 is released from the holes 46. Further, hot water for which a centrifugal force is applied by the rotation of the blades 44 is released from the holes 46 in jet stream, and even if air is included for some reason or other, air and bubbles B are spouted together and the operation of the pump is able to be returned to the normal one by itself.
|
