Propeller for ventilator, with a variable blade angle

Patent metadata

Field	Value
Publication number	US-9841032-B2
Application number	US-201113876874-A
Country	US
Kind code	B2
Filing date	Jul 28, 2011
Priority date	Sep 29, 2010
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

A blower wheel comprises a hub, a guide and blades extending radially between the hub and the guide, each blade comprising a root at its junction with the hub and a head at the junction with the guide, each blade having a leading edge and a trailing edge between which, at each flattened cross section, a chord is defined. For each blade, in the radial direction from the root to the head, the pitch angle between the chord and the rotation axis of the wheel varies and the variation in the pitch angle between the root and the head has a point of inflexion between a first level and a second level.

First claim

The invention claimed is:

1. A blower wheel for cooling an engine for driving a motor vehicle, said blower wheel comprising a hub, a guide and blades extending radially between the hub and the guide, each blade comprising a root at its junction with the hub and a head at the junction with the guide, each blade having a leading edge and a trailing edge between which, at each flattened cross section, a chord is defined, wherein for each blade, in a radial direction from the root to the head, a pitch angle between the chord and a rotation axis of the wheel varies and wherein the variation in the pitch angle between the root and the head has a point of inflexion between a first level and a second level,
wherein for each blade, in the radial direction, a length of the chord varies and in that the variation in the length of the chord between the root and the head has a point of inflexion between a first level and a second level and wherein the variation in the chord length has the first level, the second level and a third level with a point of inflexion between two consecutive levels,
wherein the first level includes a point close to, but not including, the root, wherein the second level includes a point at a distance of half the blade between the root and the head, and wherein the third level includes a point close to, but not including, the head.

2. The wheel as claimed in claim 1 , wherein in the radial direction, the pitch angle increases sharply with a radius up to the first level and the pitch angle increases again with the radius between the first level and the second level.

3. The wheel as claimed in claim 1 , wherein at the head, the pitch angle reduces sharply between the second level and the head.

4. The wheel as claimed in claim 3 , wherein in the radial direction, the pitch angle reduces sharply with a radius up to the first level and the pitch angle reduces again with the radius between the first level and the second level.

5. The wheel as claimed in claim 1 , wherein the pitch angle increases sharply between the second level and the head.

6. The wheel as claimed in claim 1 , wherein in the radial direction, the length of the chord reduces with a radius up to a first chord level, the length of the chord increases with the radius up to a second chord level and the length of the chord reduces again with the radius up to a third chord level.

7. The wheel as claimed in claim 6 , wherein in the radial direction, the length of the chord increases sharply between the third chord level and the head of the blade.

8. The wheel as claimed in claim 1 , wherein in the radial direction, the length of the chord increases with a radius up to a first chord level, the length of the chord reduces with the radius up to a second chord level and the length of the chord increases again with the radius up to a third chord level.

9. The wheel as claimed in claim 8 , wherein the length of the chord reduces sharply between the third chord level and the head.

10. The wheel as claimed in claim 1 , wherein at least one of the leading edge and trailing edge has a concave undulation and is extended by a convex undulation.

11. The wheel as claimed in claim 10 , wherein the convex undulation is placed between two concave undulations.

12. The wheel as claimed in claim 10 , wherein the concave undulation is located between two convex undulations.

13. The wheel as claimed in claim 1 , wherein each blade has a face which extends between the leading edge and the trailing edge, which has a hollow and which is extended by a bump.

14. The wheel as claimed in claim 13 , wherein the bump is located between two hollows.

Assignees

• Henner Manuel
• Demory Bruno
• Tannoury Elias
• Valeo Systemes Thermiques

Inventors

• Henner Manuel
• Demory Bruno
• Tannoury Elias

Classifications

• F04D29/384 Primary

  characterised by form · CPC title