{"id":22603,"date":"2026-03-03T09:25:53","date_gmt":"2026-03-03T08:25:53","guid":{"rendered":"https:\/\/mag.ebmpapst.com\/en\/?p=22603"},"modified":"2026-03-10T09:43:16","modified_gmt":"2026-03-10T08:43:16","slug":"radipac-m-higher-efficiency-thanks-to-high-performance-metal-impeller","status":"publish","type":"post","link":"https:\/\/mag.ebmpapst.com\/en\/industries\/refrigeration-ventilation\/radipac-m-higher-efficiency-thanks-to-high-performance-metal-impeller_22603\/","title":{"rendered":"RadiPac M: Higher effi\u00adciency thanks to high-perfor\u00admance metal impeller"},"content":{"rendered":"\n

In today\u2019s aero\u00addy\u00adnam\u00adi\u00adcally sophis\u00adti\u00adcated fans, impellers and inlet rings are usually made of plastic. Injec\u00adtion molding allows for precise design, enabling compo\u00adnents to be manu\u00adfac\u00adtured with very small toler\u00adances. However, the disad\u00advan\u00adtages of plastic in the event of fire include a build-up of gas and lower dimen\u00adsional stability. For this reason, the use of plastic is often very limited in some markets, mainly in the USA, often in Asia, and to some extent in Europe (France).<\/p>\n\n\n\n

Modern manu\u00adfac\u00adturing for high-perfo\u00admance impellers<\/h2>\n\n\n\n

The fan experts at ebm-papst are there\u00adfore focusing on new and improved options in sheet metal forming and joining processes in order to develop modern, high-perfor\u00admance impellers that neither melt nor produce smoke in the event of a fire and can be used effi\u00adciently in any envi\u00adron\u00adment (Image 1). The aero\u00addy\u00adnam\u00adi\u00adcally most favor\u00adable designs for blades, bases and cover plates can be tech\u00adni\u00adcally imple\u00admented (Image 2). Manu\u00adfac\u00adturing toler\u00adances are also very low today, and the air gap between the inlet ring and the impeller is smaller than in the previous metal design. This also results in higher effi\u00adciency in the new series (Image 3). If required, hybrid versions consisting of a metal impeller and a plastic inlet ring with a smaller air gap can be assem\u00adbled for even greater effi\u00adciency.<\/p>\n\n\n

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Image 1: New 3rd gener\u00ada\u00adtion RadiPac centrifugal fan in metal design. (Image | ebm-papst)<\/p><\/div>\n

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Figure 2. New forming and welding tech\u00adniques make it tech\u00adni\u00adcally feasible to produce blades, bases and cover plates with the most aero\u00addy\u00adnam\u00adi\u00adcally favor\u00adable design. (Image | ebm-papst)<\/p><\/div>\n<\/div>\n\n\n

The indi\u00advidual parts of the impellers are joined together to form a single unit using modern welding processes. The devil is in the detail: even with high produc\u00adtion volumes, the manu\u00adfac\u00adturing process must always deliver repro\u00adducible results with high dimen\u00adsional accu\u00adracy and a long service life. However, welding as a thermal process is known to alter the metal struc\u00adture and can lead to locally reduced strength. By opti\u00admizing the shape of the fan blades at the higher-stress exit edge, the stress can be shifted away from the joint at the blade root and into the unchanged mate\u00adrial struc\u00adture. <\/p>\n\n\n\n

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