Back to results
US 12,109,746 B2Granted
Method for manufacturing an impeller
Assigneeebm-papst Mulfingen GmbH & Co. KG
InventorsErhard Gruber, Martin Kleinschrodt, Lili Zhao
Life of this patent
Estimating the term…
Abstract
A method for manufacturing an impeller with a number of impeller blades and a cover disc covering the impeller blades. Plastic is injected into an injection mold using a cascade injection molding process to form the impeller. The injection mold has a number of shut-off nozzles to feed the plastic at various joint positions and different opening times. The number of shut-off nozzles is determined as a function of the number of impeller blades.
Claims11
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.
1 more element
Dependencies are inferred from the claim text.