| 摘要 |
PURPOSE:To make the flow of liquid in a low flow speed part active and prevent generation of corrosion near the pump shaft of a pump casing by a method wherein a liquid path, passing from the center of a packing for a rotary body including an impeller to the low-pressure part of a pump chamber, is provided. CONSTITUTION:High-pressure liquid in a scroll chamber 18, which is increased in the speed and the pressure thereof by an impeller 4, is passed through the back side of an impeller main plate 9, is injected from a gap between a linering 8 and a wearing part, collides against the wall surface 16 of an intermediate casing 2 as shown by arrow signs 17, is sucked out of a balance hole entrance 113A at a shaft packing side of a part near the center of the rotary body including the impeller 4 to the suction side low-pressure part of a pump chamber through a balance hole 113, and thereby balancing the impeller 4. Accordingly, the surface facing to the vicinity of the pump shaft 3 in the back chamber 10 for the impeller in a shaft packing house 11 is contacted by high-speed current shown by the arrow sign 17', therefore, the flow in the low-speed part is made active and the corrosion of said part may be prevented. |
