| 摘要 |
PURPOSE:To reduce the disturbance of main flow by forming a concaved part onto the surface of a casing wearing ring opposed to the suction-side edge surface of the side plate of a vane wheel. CONSTITUTION:Outside the suction port 3b side of the side plate 3a of a vane wheel 4 in a casing 4, a casing wearing ring 6 is fixed onto the casing 4. The passage 10 between the leak-side opened port (a) of a water sealing gap (c) and an effluence port (b) for the leak fluid into a suction passage 1 is formed with the edge surface 3c on the suction port 3b side of the side plate 3a and the surface 6a of the casing wearing ring 6 opposed to the edge surface 3c, and a concaved part 6b is formed in the intermediate part of the surface 6a. Therefore, the speed of the leak fluid is markedly decelerated, and the disturbance of main flow can be reduced markedly.
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