| 摘要 |
<p>The present invention relates to a centrifugal pump. A lower casing (10) with an inlet (11) and an outlet (12) is connected to a lower part of a middle casing (20) and the lower part of an outer sleeve (30). The middle casing (20) is arranged inside the outer sleeve (30). Accordingly, a passage gap (35) is formed between the outer sleeve (30) and the middle casing (20); and an upper casing (40) is connected to the upper part of the outer casing (30) and the upper part of the middle casing (20). A plurality of impellers (70) are mounted to a shaft (60) connected to a driving shaft (51) of a motor (50), thereby being arranged inside the middle casing (20) by a plurality of stages. A priming water supply plug (90) and an air vent plug (80) are mounted to an upper casing (20). A hollow unit (91) is formed in the priming water supply plug (90). A transparent window (92) is mounted on the upper part of the hollow unit (91). A locking protrusion (93) is formed on the lower circumference of the hollow unit (91), and a floating member (100) is arranged on the hollow unit (91).</p> |
