Propeller for ventilator, with a variable chord length

Patent metadata

Field	Value
Publication number	US-9970453-B2
Application number	US-201113876870-A
Country	US
Kind code	B2
Filing date	Jul 28, 2011
Priority date	Sep 29, 2010
Publication date	May 15, 2018
Grant date	May 15, 2018

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, between the root and the head, the length of the chord varies and the variation in the length of chord between the root and the head has a point of inflexion between two levels.

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 the radial direction from the root to the head, the length of the chord varies and wherein the variation in the length of the chord between the root and the head has a point of inflexion between two levels, and the variation in the length of the chord has three levels with a point of inflexion between two consecutive levels, and each level is independently a point at which the length of the chord does not vary, and in the radial direction, the length of the chord reduces with the radius up to a first level, the length of chord increases with the radius up to a second level, and the length of chord reduces again with the radius up to a third level, and wherein the first level, the second level, and the third level are on different radial planes from one another, and wherein the leading edge and the trailing edge of a single blade have non-equivalent profiles such that the leading edge comprises a plurality of undulations and the trailing edge comprises a curve having a single concavity.

2. The wheel as claimed in claim 1 , wherein in the radial direction, the length of chord increases sharply between the third level and the head of the blade.

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

4. The wheel as claimed in claim 1 , wherein the length of chord reduces sharply between the third level and the head.

5. The wheel as claimed in claim 1 , wherein between the root and the head, the pitch angle varies and in that 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.

6. The wheel as claimed in claim 5 , wherein in the radial direction, the pitch angle increases sharply with the radius up to the first level and the pitch angle increases again with the radius between the first level and the second level.

7. The wheel as claimed in claim 5 , wherein at the head, the pitch angle reduces sharply between the second level and the head.

8. The wheel as claimed in claim 5 , wherein in the radial direction, to the head, the pitch angle reduces sharply with the radius up to the first level and the pitch angle reduces again with the radius between the first level and the second level.

9. The wheel as claimed in claim 5 , wherein the pitch angle increases sharply between the second 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 located 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

• F04D29/326 Primary

  comprising a rotating shroud · CPC title

• B64C27/463

  Blade tips · CPC title

• F05B2260/96

  Preventing, counteracting or reducing vibration or noise · CPC title

• F04D29/384 Primary

  characterised by form · CPC title

• F01D5/141

  Shape, i.e. outer, aerodynamic form (F01D5/148 - F01D5/20 take precedence; blade construction F01D5/147) · CPC title