FAN

• US 20090060710A1
• Filed: 09/03/2008
• Published: 03/05/2009
• Est. Priority Date: 09/04/2007
• Status: Active Grant

• Current Assignee: Dyson Technology Limited (Beeswax Holdings UK Limited)
• Original Assignee: Dyson Technology Limited (Beeswax Holdings UK Limited)
• Inventors: Gammack, Peter David, Simmonds, Kevin John, Nicolas, Frederic
• Granted Patent: US 8,308,445 B2
• Time in Patent Office: Days
• US Class Current: 415/90
• CPC Class Codes: F04D 25/06 the pump being electrically driven F04D25/08 takes precedence
• CPC Class Codes: F04D 25/08 the working fluid being air, e.g. for ventilation
• CPC Class Codes: F04D 29/681 especially adapted for elastic fluid pumps
• CPC Class Codes: F04F 5/16 displacing elastic fluids
• CPC Class Codes: F04F 5/46 Arrangements of nozzles

Abstract

A fan assembly for creating an air current includes a bladeless fan assembly including a nozzle and a device for creating an air flow through the nozzle. The nozzle includes an interior passage and a mouth receiving the air flow from the interior passage. A Coanda surface located adjacent the mouth and over which the mouth is arranged to direct the air flow. The fan provides an arrangement producing an air current and a flow of cooling air created without requiring a bladed fan, that is, the air flow is created by a bladeless fan.

Claims

1. A bladeless fan assembly for creating an air current, the fan assembly comprising a nozzle and a device creating an air flow through the nozzle, the nozzle comprising an interior passage, a mouth for receiving the air flow from the interior passage, and a Coanda surface located adjacent the mouth and over which the mouth is arranged to direct the air flow.

2. A fan assembly as claimed in claim 1, wherein the nozzle defines an opening through which air from outside the fan assembly is drawn by the air flow directed over the Coanda surface.

3. A fan assembly as claimed in claim 1 or 2, wherein the nozzle comprises a loop.

4. A fan assembly as claimed in claim 1 or 2, wherein the nozzle is substantially annular.

5. A fan assembly as claimed in claim 1 or 2, wherein the nozzle is at least partially circular.

6. A fan assembly as claimed in claim 1 or 2, wherein the interior passage is continuous.

7. A fan assembly as claimed in claim 1 or 2, wherein the interior passage is substantially annular.

8. A fan assembly as claimed in claim 1 or 2, wherein the mouth is substantially annular.

9. A fan assembly as claimed in claim 1 or 2, wherein the mouth is concentric with the interior passage.

10. A fan assembly as claimed in claim 1 or 2, wherein the Coanda surface extends symmetrically about an axis.

11. A fan assembly as claimed in claim 10, wherein the angle subtended between the Coanda surface and the axis is in a range from 7°

to 20°

.

12. A fan assembly as claimed in claim 10, wherein the nozzle extends by a distance of at least 5 cm in the direction of the axis.

13. A fan assembly as claimed in claim 10, wherein the nozzle extends about the axis by a distance in the range from 30 cm to 180 cm.

14. A fan assembly as claimed in claim 1 or 2, wherein the nozzle comprises a diffuser located downstream of the Coanda surface.

15. A fan assembly as claimed in claim 1 or 2, wherein the nozzle comprises at least one wall defining the interior passage and the mouth, and wherein said at least one wall comprises opposing surfaces defining the mouth.

16. A fan assembly as claimed in claim 1 or 2, wherein the mouth has an outlet, and the spacing between the opposing surfaces at the outlet of the mouth is in a range from 1 mm to 5 mm.

17. A fan assembly as claimed in claim 1 or 2, wherein the device creating an air flow through the nozzle comprises an impeller driven by a motor.

18. A fan assembly as claimed in claim 17, wherein the device creating the air flow comprises a DC brushless motor and a mixed flow impeller.

20. A fan assembly as claimed in claim 10, wherein the angle subtended between the Coanda surface and the axis is about 15°

.

19. (canceled)