Method for manufacturing an impeller

Patent metadata

Field	Value
Publication number	US-12109746-B2
Application number	US-202117498801-A
Country	US
Kind code	B2
Filing date	Oct 12, 2021
Priority date	Oct 15, 2020
Publication date	Oct 8, 2024
Grant date	Oct 8, 2024

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.

First claim

What is claimed is:

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.

2. The method as set forth in claim 1 , further comprising correlating various positions with the cover disc.

3. The method as set forth in claim 2 , further comprising correlating the various positions of the cover disc in such a way that, when viewed in a projection, the positions of the cover disc are each located between adjacent impeller blades.

4. The method as set forth in claim 1 , wherein the number of impeller blades is even and the number of shut-off nozzles corresponds to the number of impeller blades.

5. The method as set forth in claim 1 , wherein the number of impeller blades is odd and the number of shut-off nozzles is greater than the number of impeller blades.

6. The method as set forth in claim 1 , wherein if the number of impeller blades is odd, the number of shut-off nozzles is twice that of the impeller blades.

7. The method as set forth in claim 1 , wherein a plurality of the shut-off nozzles are respectively divided into cascade groups, and the cascade groups have successive shut-off nozzle opening times.

8. The method as set forth in claim 7 , further comprising positioning the shut-off nozzles of one of the cascade groups where the joint lines of the plastic fed from the shut-off nozzles of another cascade group are located.

9. The method as set forth in claim 1 , wherein the impeller is a radial impeller.

10. The method as set forth in claim 1 , wherein the plastic is a fiber-reinforced plastic.

11. An impeller manufactured according to the method as set forth in claim 1 .

Assignees

• Ebm Papst Mulfingen Gmbh & Co Kg

Inventors

• Gruber Erhard
• Kleinschrodt Martin
• Zhao Lili

Classifications

• F04D29/2222

  Construction and assembly (F04D29/2211 takes precedence) · CPC title

• B29C2045/279

  Controlling the flow of material of two or more nozzles or gates to a single mould cavity · CPC title

• B29L2031/08

  Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers · CPC title

• B29K2101/12

  Thermoplastic materials · CPC title

• B29C45/231

  Needle valve systems therefor · CPC title