Centrifugal blower unit

Patent metadata

Field	Value
Publication number	US-10273974-B2
Application number	US-201615166626-A
Country	US
Kind code	B2
Filing date	May 27, 2016
Priority date	May 29, 2015
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

A centrifugal blower unit for motor vehicle air conditioning systems having a fan wheel ( 8 ) in a spiral housing ( 1 ), wherein the spiral housing ( 1 ) corresponds to the shape of the fan wheel ( 8 ) and has a bell mouth region ( 3 ) and an axial intake opening ( 2 ), wherein a diaphragm ( 4 ) is arranged at the bell mouth region ( 3 ) of the spiral housing ( 1 ), being radially inward, whose diaphragm end region ( 5 ) bordering the intake opening ( 2 ) has at least one sharp edge.

First claim

The invention claimed is:

1. A centrifugal blower unit for a motor vehicle air conditioning system comprising:
a fan wheel ( 8 ) in a spiral housing ( 1 ), wherein the spiral housing ( 1 ) corresponds to a shape of the fan wheel ( 8 ), the spiral housing ( 1 ) including a bell mouth region ( 3 ) and an axial intake opening ( 2 );
a diaphragm ( 4 ) arranged at the bell mouth region ( 3 ) of the spiral housing ( 1 ) radially inward, a diaphragm end region ( 5 ) bordering the intake opening ( 2 ) and having at least one sharp edge which is situated in an air passage direction ( 7 ) as a last edge in the diaphragm end region ( 5 );
wherein the diaphragm extends only in a radial direction from a radial end of a bell mouth of the bell mouth region to the diaphragm end region.

2. The centrifugal blower unit according to claim 1 , wherein the diaphragm end region ( 5 ) bordering the intake opening ( 2 ) is beveled for an entire thickness of the diaphragm ( 4 ) in the air passage direction ( 7 ).

3. The centrifugal blower unit according to claim 2 , wherein the diaphragm ( 4 ) is beveled in the diaphragm end region ( 5 ) by 45° in the air passage direction ( 7 ).

4. The centrifugal blower unit according to claim 2 , wherein the diaphragm ( 4 ) in the diaphragm end region ( 5 ) is configured with a sharp tip with a tip radius of 0.1 mm to 0.5 mm.

5. The centrifugal blower unit according to claim 1 , wherein the diaphragm end region ( 5 ) bordering the intake opening ( 2 ) is configured with two rights angles parallel to the fan wheel axis ( 6 ).

6. The centrifugal blower unit according to claim 1 , wherein the diaphragm end region ( 5 ) bordering the intake opening ( 2 ) is beveled for a portion of a thickness of the diaphragm ( 4 ) in the air passage direction ( 7 ) and configured parallel to the fan wheel axis ( 6 ) for a portion of the thickness of the diaphragm ( 4 ).

7. The centrifugal blower unit according to claim 1 , wherein the diaphragm end region ( 5 ) bordering the intake opening ( 2 ) is rounded for a portion of a thickness of the diaphragm ( 4 ) in the air passage direction ( 7 ) and configured parallel to the fan wheel axis ( 6 ) for a portion of the thickness of the diaphragm ( 4 ).

8. The centrifugal blower unit according to claim 1 , wherein the diaphragm end region ( 5 ) bordering the intake opening ( 2 ) is rounded for an entire thickness of the diaphragm ( 4 ) in the air passage direction ( 7 ).

9. The centrifugal blower unit according to claim 1 , wherein fan wheel blades of the fan wheel ( 8 ) are entirely covered by the diaphragm ( 4 ).

10. The centrifugal blower unit according to claim 1 , wherein the intake opening ( 2 ) has a ratio to a fan wheel diameter of 1 to 1.4.

11. The centrifugal blower unit according to claim 1 , wherein the diaphragm ( 4 ) has a length in a radial direction of the fan wheel axis ( 6 ) of 7.5 mm.

12. The centrifugal blower unit according to claim 1 , wherein the diaphragm ( 4 ) has a thickness of 2 mm.

13. The centrifugal blower unit according to claim 1 , wherein the diaphragm ( 4 ) is configured as a circular ring and an inner diameter of the diaphragm ( 4 ) borders the intake opening ( 2 ).

14. The centrifugal blower unit according to claim 1 , wherein the intake opening ( 2 ) has a diameter between 90 mm and 110 mm.

15. The centrifugal blower unit according to claim 1 , wherein the diaphragm ( 4 ) at an outer diameter passes at a right angle into the bell mouth region ( 3 ).

16. The centrifugal blower unit according to claim 1 , wherein the diaphragm ( 4 ) is at right angles to a fan wheel axis ( 6 ).

Assignees

• Hanon Systems

Inventors

• Degenhardt Olaf
• Sievers Eckart
• Jung Harald
• Esser Nico

Classifications

• F04D29/4226

  Fan casings · CPC title

• F04D25/08

  the working fluid being air, e.g. for ventilation · CPC title

• F04D29/681

  especially adapted for elastic fluid pumps · CPC title

• F04D29/661

  especially adapted for elastic fluid pumps · CPC title

• F05B2240/14

  Casings, housings, nacelles, gondels or the like, protecting or supporting assemblies there within · CPC title