2results about How to "Dense material" patented technology

This invention provides an impeller for a centrifugal blower with a riveting structure, comprising a front disc, a rear disc, and blades. Each blade includes a blade body with multiple blade fixing teeth on both sides. The front and rear discs have multiple riveting holes. The blades are connected to the front and rear discs via the blade fixing teeth passing through the riveting holes. After passing through the riveting holes, the front ends of the blade fixing teeth on both sides of the blade body are located on the outer sides of the front and rear discs, respectively. The outer blade fixing teeth are locked to their adjacent outer ends, achieving riveting fixation between the blades and the front and rear discs. This impeller uses a riveting method, which has a short processing cycle and low investment cost. Furthermore, it is made of aerospace-grade aluminum plate, which has high strength and can be applied to large-diameter, high-speed impellers. At the same time, the lightweight nature of aerospace-grade aluminum plate does not increase the bearing load. This invention can be widely applied to the processing of impellers in centrifugal blowers.

The invention discloses an isostatic pressing ceramic tube shell which comprises a ceramic body and a metal tube shell matched with the ceramic body for use, the ceramic body is formed by sintering a dry base made of powder and a forming aid after blank making, and the forming aid accounts for less than 8% of the weight of the dry base during blank making. The dry basis comprises the following components in percentage by weight: 5%-15% of CaO, 3%-10% of MgO, 20%-35% of AL2O3 and 40%-60% of SiO2, and the sintered ceramic body does not contain a forming aid. The preparation method comprises the steps of ceramic body blank preparation, blank shape treatment, blank sintering, surface treatment and shaping treatment, and finally, isostatic pressing ceramic tube shell finished products are detected and put in storage. A quaternary system formula (CaO, MgO, AL2O3 and SiO2) is adopted, the performance index is good, the isostatic pressing ceramic tube shell core is a calcium-magnesium-aluminum-silicon system ceramic system and is suitable for being matched and sealed with a metal tube shell, and compared with a traditional ternary system formula, the calcium-magnesium-aluminum-silicon system isostatic pressing ceramic tube shell has the advantages of being low in dielectric loss, large in volume resistance, large in bending strength, high in acid resistance and the like.