Axial mini ventilator with parabolic guide vanes

• US 5,511,942 A
• Filed: 11/01/1994
• Issued: 04/30/1996
• Est. Priority Date: 11/04/1993
• Status: Expired due to Term

• Current Assignee: Micronel AG
• Original Assignee: Micronel AG
• Inventors: Meier, Peter
• Primary Examiner(s): Look, Edward K.
• Assistant Examiner(s): Lee, Michael S.
• Application Number:
  US08/332,941
• Time in Patent Office: 546 Days
• Field of Search: 415/211.2, 415/220
• US Class Current: 415/220
• CPC Class Codes: F04D 19/002 Axial flow fans
• CPC Class Codes: F04D 29/544 Blade shapes

Abstract

An axial mini ventilator having an air conduction housing with an impeller wheel on the suction-side end of a tubular flow channel. Formed on the inside of the air conduction housing are air baffles which support the stator of an electric drive motor for the impeller wheel. The tip and/or root lines of the baffles are essentially segments of a parabola. The parabolas are oriented so that their point of origin is on the pressure-side end of the flow channel, and their plane of symmetry runs at right angles to the direction of flow. As a result of this configuration of the baffles, the turbulence in the flow channel can be reduced and the efficiency can be significantly increased.

Claims

1. An axial mini ventilator comprising an air conduction housing with a ring-shaped flow channel having a suction-side end and a pressure-side end, an impeller wheel located on the suction-side end of the flow channel completely within the air conduction housing, a plurality of baffles extending radially in the flow channel in the air conduction housing and having curved tip and root lines, the tip and root lines of the baffles being both essentially segments of a parabola such that the baffles are radially twisted, whereby the point of origin of the coordinates of the parabola is located on the pressure-side end of the flow channel and the plane of symmetry of the parabola extends transversely to the direction of flow in the flow channel of the air conduction housing.

2. An axial mini ventilator as claimed in claim 1, wherein on the pressure-side end of the baffles, the angle β

between the tangent to the baffle surface and the axis of symmetry of the parabola is 80°

to 90°

.

3. An axial mini ventilator as claimed in claim 1, wherein the air conduction housing has a tubular shape.

4. An axial mini ventilator as claimed in claim 1, wherein the length of the air conduction housing is greater than its outside diameter.

5. An axial mini ventilator as claimed in claim 4, wherein on the endpoints of the baffles close to the vanes, the angle α

between the tangent to the baffle surface and the plane of symmetry of the parabola is between about 10° and

about 60°

.

6. An axial mini ventilator as claimed in claim 4, wherein on the pressure-side end of the baffles, the angle β

between the tangent to the baffle surface and the axis of symmetry of the parabola is 80°

to 90°

.

7. An axial mini ventilator as claimed in claim 1, wherein the ratio of the diameter to the length of the housing is greater than 1:

0.5 and less than 1;

2.

8. An axial mini ventilator as claimed in claim 7, wherein on the pressure-side end of the baffles, the angle β

between the tangent to the baffle surface and the axis of symmetry of the parabola is 80°

to 90°

.

9. An axial mini ventilator as claimed in claim 1, wherein on the endpoints of the baffles close to the vanes, the angle α

between the tangent to the baffle surface and the plane of symmetry of the parabola is between about 10° and

about 60°

.

10. An axial mini ventilator as claimed in claim 9, wherein said angle α

between the tangent to the baffle surface and the plane of symmetry of the parabola is between 20° and

45°

.

11. An axial mini ventilator as claimed in claim 9, wherein the angle α

is approximately 30°

.

12. An axial mini ventilator as claimed in claim 1, wherein the baffles support a drive motor which is oriented coaxially within the air conduction housing.

13. An axial mini ventilator as claimed in claim 12, wherein the length of the air conduction housing is greater than its outside diameter.

14. An axial mini ventilator as claimed in claim 13, wherein on the endpoints of the baffles close to the vanes, the angle α

between the tangent to the baffle surface and the plane of symmetry of the parabola is between about 10° and

about 60°

.

15. An axial mini ventilator as claimed in claim 13, wherein on the pressure-side end of the baffles, the angle β

between the tangent to the baffle surface and the axis of symmetry of the parabola is 80°

to 90°

.

16. An axial mini ventilator as claimed in claim 12, wherein the ratio of the diameter to the length of the housing is greater than 1:

0.5 and less than 1;

2.

17. An axial mini ventilator as claimed in claim 16, wherein on the pressure-side end of the baffles, the angle β

between the tangent to the baffle surface and the axis of symmetry of the parabola is 80°

to 90°

.

18. An axial mini ventilator as claimed in claim 12, wherein on the endpoints of the baffles close to the vanes, the angle α

between the tangent to the baffle surface and the plane of symmetry of the parabola is between about 10° and

about 60°

.

19. An axial mini ventilator as claimed in claim 12, wherein on the pressure-side end of the baffles, the angle β

between the tangent to the baffle surface and the axis of symmetry of the parabola is 80°

to 90°

.

20. An axial mini ventilator as claimed in claim 12, wherein the air conduction housing has a tubular shape.