Fan blade pitch setting

Patent metadata

Field	Value
Publication number	US-10767500-B2
Application number	US-201615148782-A
Country	US
Kind code	B2
Filing date	May 6, 2016
Priority date	May 6, 2016
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

There are provided techniques and apparatuses for fan blade pitch setting. For example, there is provided an impeller including a ring disposed in a hub of the impeller. The ring can include a recess shaped and positioned to impart a specified pitch angle to a blade extending outwardly from the ring through the hub.

First claim

What is claimed is:

1. An impeller comprising:
a ring disposed in a hub of the impeller, wherein the hub has a slot formed through a wall of the hub such that the slot has an open end at one edge of the wall and is configured to receive a portion of a blade through the open end, the ring including a non-circular recess shaped and positioned to impart a specified pitch angle to the blade extending outwardly from the ring through the slot of the hub, the non-circular recess being elongated in a direction different from the slot and non-parallel to a vertical axis where the vertical axis is parallel to an axis of rotation of the impeller;
wherein the blade includes a first portion and a second portion joined by a rod, the second portion engaging the recess to position the blade at the specified pitch angle.

2. The impeller of claim 1 , wherein the ring is secured to the hub by a fastener.

3. The impeller of claim 1 , further comprising a hub reinforcement ring disposed on an outside wall of the hub.

4. The impeller of claim 1 , wherein the hub and the blade are each made of a same material.

5. The impeller of claim 1 , wherein the hub is made of an aluminum alloy.

6. The impeller of claim 1 , wherein the specified pitch angle is about 50 degrees.

7. An impeller comprising:
a blade including a portion shaped to mate with a recess of a ring disposed in a hub of the impeller, the recess being elongated in a direction different from the slot and non-parallel to a vertical axis to provide a specified pitch angle for the blade, the vertical axis being parallel to an axis of rotation of the impeller, and the hub has a slot formed through a wall of the hub such that the slot has an open end at one edge of the wall and is configured to receive a portion of the blade through the open end.

8. The impeller of claim 7 , wherein the blade is made of a same material as that of the hub.

9. An impeller assembly, comprising:
a set of blades;
a hub that has a set of slots formed through one wall of the hub such that each slot has an open end at one edge of the wall and is configured to receive a portion of a blade from a set of blades through the open end; and
a pitch-setting ring disposed on an inner wall of the hub, the pitch-setting ring including a set of recesses, wherein each of the recesses is fully enclosed and elongated in a direction non-parallel to a vertical axis and configured to secure the blade from the set of blades at a specified pitch angle and such that the blade is positioned such that it extends through a slot wherein the vertical axis is parallel to an axis of rotation of the impeller.

10. The impeller assembly of claim 9 , wherein the pitch-setting ring is fastened on the hub by screws or pins.

11. The impeller assembly of claim 9 , wherein a first blade and a second blade included in the set of blades have different pitch angles.

12. The impeller assembly of claim 9 , wherein blades from at least one subset of the set of blades have a same pitch angle.

13. The impeller assembly of claim 9 , further comprising a hub reinforcement ring disposed on an outside wall of the hub.

14. The impeller assembly of claim 9 , wherein the specified pitch angle is about 50 degrees.

Assignees

• Ge Aviation Systems Llc

Inventors

• Kobayashi Sukeyuki

Classifications

• F04D29/34

  Blade mountings {(for axial flow compressors F04D29/322)} · CPC title

• F01D5/3069

  between two discs or rings · CPC title

• F04D29/36

  adjustable {(flexible blades F04D29/382)} · CPC title

• F01D7/00 Primary

  Rotors with blades adjustable in operation; Control thereof (for reversing F01D1/30) · CPC title