| 摘要 |
PURPOSE:To enhance the pumping efficiency by recessing reinforcements in the external casing, providing a smooth configuration with the aid of an internal casing molded as in a single piece, and thereby lessening the fluid friction. CONSTITUTION:Because the radius of the cylindrical part 16 at the suction hole 2 of an external casing 14 is large, adhesive force can retain this cylindrical part 16. The inner walls of the internal pump room 3 sustains more fluid pressure than the part fitted with a liner ring 12, and because the spiral part 11 and its sides and the cylindrical part 17 at the discharge hole 5 receive inner pressures, the external casing 14 can oppose together with casing reinforcements 15 through the internal casing 1. Therefore this can be provided with a smooth configuration because of solid forming of this internal casing 1 in a single piece to give a lessened fluid friction, and thus the pumping efficiency can be enhanced. |
