US 12,109,746 B2
Method for manufacturing an impeller
Erhard Gruber, Satteldorf (DE); Martin Kleinschrodt, Creglingen (DE); and Lili Zhao, Bad Mergentheim (DE)
Assigned to ebm-papst Mulfingen GmbH & Co. KG, Mulfingen (DE)
Filed by ebm-papst Mulfingen GmbH & Co. KG, Mulfingen (DE)
Filed on Oct. 12, 2021, as Appl. No. 17/498,801.
Claims priority of application No. 10 2020 127 199.9 (DE), filed on Oct. 15, 2020.
Prior Publication US 2022/0118663 A1, Apr. 21, 2022
Int. Cl. B29C 45/22 (2006.01); B29C 45/00 (2006.01); B29C 45/23 (2006.01); B29C 45/27 (2006.01); B29K 101/12 (2006.01); B29L 31/08 (2006.01); F04D 29/22 (2006.01)
CPC B29C 45/22 (2013.01) [B29C 45/0005 (2013.01); B29C 45/231 (2013.01); B29C 2045/279 (2013.01); B29K 2101/12 (2013.01); B29L 2031/08 (2013.01); F04D 29/2222 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for manufacturing an impeller with a number of impeller blades and a cover disc covering the impeller blades comprising:
injection-molding the impeller blades from plastic into an injection mold using a cascade injection molding process;
feeding the plastic into the injection mold via a number of shut-off nozzles at different positions only along a circumference of the injection mold with different opening times such that the plastic enters the injection mold in an axial direction with respect to an axis of the impeller blades; and
determining the number of shut-off nozzles as a function of the number of impeller blades wherein when the number of impeller blades is even the number of shut- off nozzles and impeller blades is always the same and when the number of impeller blades is odd there are always more shut-off nozzles than impeller blades.