Fan apparatus for a cooking device
View Patent ↗A fan apparatus for a cooking device is provided having a fan impeller that is held on a drive shaft of a rotary drive by its hub and is pressed against a stop of the drive shaft in an axial direction by a screw nut. In order to ensure that the fan impeller is securely held on the drive shaft, the screw nut exerts a pressing force on the fan impeller in a radial direction.
1. A fan apparatus for a cooking device, the fan apparatus comprising:
an impeller wheel that is securable on a drive shaft of a rotary drive, the impeller wheel having a hub delimiting a bore for receiving therethrough a drive shaft of a rotary drive such that the hub of the impeller wheel has, in an installed position of the impeller wheel, a drive shaft of a rotary drive extending therethrough with a stop on the drive shaft of a rotary drive preventing movement of the impeller wheel along the drive shaft in one axial direction beyond a first predetermined axial location on the drive shaft; and means for exerting a radially inward force on the hub of the impeller, at least one of the hub and the means for exerting a radially inward force being securable to a drive shaft of a rotary drive to prevent movement of the impeller wheel along the drive shaft in an axial direction opposite to the one axial direction beyond a second predetermined axial location on the drive shaft.
2. The fan apparatus as claimed in claim 1 , wherein the means for exerting a radially inward force presses against an outer surface of the hub in order to exert a pressing force in the radial direction.
3. The fan apparatus as claimed in claim 2 , wherein the means for exerting a radially inward force is formed with an interior surface segment, which presses against an exterior surface of the hub.
4. The fan apparatus as claimed in claim 2 , wherein the exterior of the hub is configured as a truncated cone.
5. The fan apparatus as claimed in claim 4 , wherein an angle of inclination of approximately 5° to 10° is enclosed between the exterior of the truncated cone hub and a rotary axis of the drive shaft.
6. The fan apparatus as claimed in claim 1 , wherein a free end of the hub includes a cylinder segment.
7. The fan apparatus as claimed in claim 4 , wherein an interior surface segment of the means for exerting a radially inward force has a conical shape compatibly configured with respect to the truncated cone hub.
8. The fan apparatus as claimed in claim 5 , wherein the angle of inclination is 7°.
9. The fan apparatus as claimed in claim 1 , wherein the means for exerting includes a threaded nut engageable with threads located on the drive shaft.
10. A fan apparatus having an impeller wheel, which is held on a drive shaft of a rotary drive by means of its hub and is pressed against a stop of the drive shaft in an axial direction by a screw nut having a threaded portion to engage with a corresponding threaded portion on the drive shaft, the screw nut having a ramped section adjacent the threaded section and oriented towards the fan impeller to exert a pressing force on the fan impeller in a radial direction.
11. The fan apparatus as claimed in claim 10 , wherein the screw nut presses against an outer surface of the hub in order to exert a pressing force in the radial direction.
12. The fan apparatus as claimed in claim 10 , wherein the screw nut is formed with an interior surface segment, which presses against the exterior surface on the hub.
13. The fan apparatus as claimed in claim 10 , wherein the hub is embodied on the exterior in the manner of a truncated cone.
14. The fan apparatus as claimed in claim 13 , wherein in an angle of inclination (a) of approximately 5° to 10°, is enclosed between the exterior of the truncated cone hub and a rotary axis of the drive shaft.
15. The fan apparatus as claimed in claim 14 , wherein the angle of the inclination is 7°.
16. The fan apparatus as claimed in claim 13 , wherein the free end of the hub comprises a cylinder segment adjacent the truncated cone.
17. The fan apparatus as claimed in claim 12 , wherein the interior surface segment of the nut is embodied in a conical fashion in accordance with the hub.
18. The fan apparatus as claimed in claim 10 , wherein the hub includes a flange having a diameter that varies and is pre-formed to reduce in diameter in a direction of a free end of the drive shaft.
19. A cooking device comprising:
a cooking chamber; and
the fan apparatus of claim 10 to distribute heat equally in the cooking chamber.