| 摘要 |
PURPOSE:To enhance the suction efficiency of an air aspirator by providing an air passage to the inside of a rotary shaft and arranging coaxially protruding vanes to one part of the rotary shaft and also providing air discharge holes communicating to the air passage to the rear parts of these vanes. CONSTITUTION:When a screw is rotated in the direction shown in an arrow, vortexes 7 of the vane ends which are discharged from the tip parts of respective vanes 3 exceed the tips of the vanes 3 from the edge face parts 4 and become vortexes in the rear parts 5 side. Pressure is lowered in the centers of the vortexes 7 of the vane ends and cavitation is generated and this is generated on the rear parts 5 of the tips of the vanes 3 and the vortexes 7 of the vane ends are made to a pressure distribution state shown in broken lines. Therefore, air corresponding to the reduction of pressure resulting from the vortexes 7 of the vane ends can be sucked through a passage 2 by forming holes 6 to the rear parts 5 of the tips of the vanes 3 wherein the vortexes 7 of the vane ends are generated. |
