| 摘要 |
PURPOSE:To make such a high efficiency as approximating to an axial-flow system giveable, by using a vaned rotary diffuser (a second impeller) in place of a stator diffuser, and constituting this diffuser so as to be rotated at proper speed in the opposite direction to the convertional impeller (a first impeller). CONSTITUTION:A high speed fluid to be discharged out of the outer circumference of a first impeller 3 is led into a second impeller 3 rotating in the opposite direction to the impeller 3 at once or after being decelerated and boosted properly by a vortex chamber 5, or if necessary, a vaned fixed diffuser. And, a large relative speed is produced at an inlet of the impeller 6, while an absolute speed of the fluid at an outlet of the impeller 6 is sharply reduced by deceleratization due to a blade spread of the impeller 6 and that due to rotation of itself. With this constitution, dynamic pressure is efficiently converted into static pressure, and it is led into a volute casing 9 on the circumference of the impeller 6 at low speed, whereby a fluid friction loss inside this casing 9 is reduced, thus a large pressure rise of the fluid is securable at a higher efficiency as a whole.
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