Ceramic impeller

Abstract

The invention discloses a ceramic impeller and belongs to the technical field of rotary power pump equipment. According to the technical key points, an impeller body of ceramic materials is included and comprises a driving cover plate and a driven cover plate; a blade is arranged between the driving cover plate and the driven cover plate; one side of the driving cover plate is of a multilayer composite structure; and the multilayer composite structure comprises the driving cover plate, a first bonding energy absorption layer, a metal layer, a second bonding energy absorption layer and a seconddriving cover plate from inside to outside, wherein the second driving cover plate is of an independent structure and is made of ceramics or hard alloy, the metal layer is of a disc-shaped structure,a mandrel used for being connected with a spindle is connected to the radial inner side of the metal layer, and the first bonding energy absorption layer and the second bonding energy absorption layer are both filled with resin or a mixture of resin and abrasion resistant particles. The ceramic impeller has the characteristics that life is long, large torque can be borne, impact resistance is good, and large-scale production is easy to achieve.

Description

technical field [0001] The invention relates to the field of rotary power pump equipment, in particular to a ceramic impeller. Background technique [0002] In industries such as mineral processing and smelting, centrifugal pumps are often used to transport some abrasive solid-liquid two-phase flows, and slurry pumps are often used. Common wear-resistant pumps are often made of wear-resistant alloys such as Cr26, Cr15Mo3, or rubber and other wear-resistant materials. Pumps made of these wear-resistant alloys are difficult to meet the use requirements under many working conditions. [0003] As we all know, wear-resistant ceramics have much higher wear resistance than wear-resistant alloys, such as silicon carbide ceramics, silicon nitride ceramics, alumina ceramics, silicon nitride combined with silicon carbide ceramics, etc., their wear resistance can be higher than wear-resistant alloys Several times or even dozens of times, so CN202100535 U, CN 205687817U, CN 107654414A, ...

AI Technical Summary

Problems solved by technology

This technical solution can better solve the strength problem of the impeller, but the following problems cannot be solved better, one is the life problem, the metal internal thread bushing 1', the metal wing plate 5' and the metal locking part 11 'Even if these three parts are made of wear-resistant alloys with the best wear-resistant performance, their service life can reach at most 1 / 3 of wear-resistant ceramics. Once these metal parts are worn to a certain extent, the impeller will disintegrate, rupture and be scrapped. The wear condition of these metal parts cannot be observed during the use of the impeller, that is to say, the life of this ceramic impeller has almost no advantage compared with the wear-resistant alloy impeller; the second is the process problem. Wear resistance and processability are contradictory. If an alloy with good wear resistance is used to improve the life of the above three metal parts, the metal internal thread bushing 1', metal wing plate 5' and metal locking parts will inevitably be added. 11' The processing of these three parts is difficult. It is necessary to add threads, regular polygons and other structures to these parts with a hardness of about HRC60, and the process cost is very high

The third is the stress concentration problem, Figure 19 The torque of the impeller shown is mainly transmitted by the regular polygons arranged on the impeller main body 3' and the metal wing plate 2', while the ceramic parts tend to generate large torque at the corners of the regular polygons during the firing process. The internal stress or cracks are formed. These parts with large internal stress or cracks are prone to rupture due to stress concentration when subjected to a large torque. Another problem in the prior art is that it is difficult to increase the size of the impeller. As we all know, ceramics are sintered During the process, cracks are easy to occur and lead to the scrapping of parts. The larger the part, the easier it is to crack. Even if no cracks are found after sintering of large-sized ceramic impellers, there are often large internal stresses or invisible cracks in the fired finished parts. Its impact resistance is also much worse than that of the smaller size impeller, and it is easy to break during use. This principle is like a large-sized ceramic plate is easy to break even if it is lightly knocked, and a small mosaic ceramic plate is easy to break even if it is knocked from It will not break even if it falls from a height of tens of meters

[0005] In summary, the wear-resistant ceramic impellers in the prior art have the problems of poor reliability, difficult process, difficult to withstand large torque, poor impact resistance, and difficult to enlarge

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