CENTRIFUGAL IMPELLER OF SLURRY PUMP

PURPOSE:To markedly improve the abrasion-resisting property and the strength of an impleller by a method wherein the impeller, a foreside shroud and a backside shroud are cmposed of segments made of a plurality of high abrasion- resisting materials, and these segments are internally chilled in one body by fused metals. CONSTITUTION:Silicon nitride or silicon carbide is used as a segment material on the point of heat resistance impact at the time of internal chill. A segment 1 forming a unit of impeller is composed of a wing segment 2, a foreside shroud segment 3 and a backside shroud segment 4, and each of these segments are set and joined together. Then at the assembling of each segment 2, 3, 4, a part of the blade segment 2 is protruded from foreside and backside shroud segments 3, 4 and segments are fixed firmly in these alloys by heat contraction on fixation using fusible metal 5 such as aluminum, zinc alloy etc. forming so-called internal chill, and enables the abrasion-resistance and the strength of the impeller to improve largely.