SINGLE-PIECE FAN WHEEL

Abstract

The invention relates to a blower wheel (1) in a one-piece design having a bottom disk (12) and a cover disk (11) between which a blade ring is formed having multiple blower wheel blades (13) disposed in the circumferential direction at a spacing from one another, wherein the bottom disk (12) defines a maximum radial diameter da and the cover disk (11) forms an axial intake opening (25) having a diameter di, wherein the cover disk (11) extends radially outwards from the circumferential edge (14) which forms the intake opening (25) and has a maximum outer diameter dt, and wherein an outer diameter ratio dt/da is defined in a range from 0.6 to 0.8.

Claims

1. A blower wheel in a one-piece design having a bottom disk and a cover disk between which a blade ring is formed having multiple blower wheel blades disposed in the circumferential direction at a spacing from one another, wherein the bottom disk defines a maximum radial diameter da and the cover disk forms an axial intake opening having a diameter di, wherein the cover disk extends radially outwards from the circumferential edge which forms the intake opening and has a maximum outer diameter dt, and wherein an outer diameter ratio dt/da is defined in a range from 0.6 to 0.8.

2. The blower wheel according to claim 1, wherein the outer diameter ratio dt/da is set in a range from 0.66 to 0.77.

3. The blower wheel according to claim 1, wherein the outer diameter ratio dt/da is set to a value of 0.69 or 0.74 with a respective maximum variation of 0.03.

4. The blower wheel according to claim 1, wherein the blower wheel blades start from the circumferential edge of the cover disk and extend radially outwards, and the axial front sides of the blower wheel blades are uncovered and extend radially outwards on a side opposite the bottom disk and comprise a free end each.

5. The blower wheel according to claim 1, wherein the cover disk, viewed in a radial section, is curved in a funnel-shaped manner and forms an inlet nozzle.

6. The blower wheel according to claim 1, wherein the cover disk has at its circumferential edge, which defines the intake opening, a thickness t which corresponds to the thickness t of the blower wheel blades.

7. The blower wheel according to claim 1, wherein the bottom disk, at least at its radially outer edge, has a thickness t that corresponds to the thickness t of the blower wheel blades.

8. The blower wheel according to claim 1, wherein a radial outer edge of the cover disk has the thickness t of the blower wheel blades.

9. The blower wheel according to claim 12, wherein the bottom and/or cover disk(s) have a constant material thickness t.

10. The blower wheel according to claim 1, wherein a ratio of the diameter of the axial intake opening di and the maximum outer diameter dt of the cover disk di/dt is in a range from 0.5 to 0.7.

11. The blower wheel according to claim 1, wherein radial inner edges of the blower wheel blades are arc-shaped.

12. The blower wheel according to claim 1, wherein it comprises a hub into which the blower wheel blades transition on their radially inner sides.

13. The blower wheel according to claim 1, wherein the outermost radial sections of the cover disk and the bottom disk extend parallel to an axial plane.

14. The blower wheel according to claim 1, wherein the bottom disk and the cover disk extend without overlapping relative to one another in an axial top view, as viewed in a projection.

15. A blower designed as a gas-air premix blower for delivering a gas-air mixture, including a multi-part blower housing and a motor unit with motor electronics disposed on its outer side, wherein a blower wheel according to claim 1 is disposed inside said blower housing which, when in operation, draws in air via an intake opening of the blower housing and blows out air via a blowout opening of the blower housing, wherein the motor unit includes a rotor which is in operative connection with the blower wheel.

Description

[0020] Other advantageous further developments of the invention are explained in more detail below with reference to the figures as part of the description of a preferred embodiment of the invention. Wherein:

[0021] FIG. 1 shows a perspective view of an exemplary embodiment of a blower wheel according to the invention;

[0022] FIG. 2 shows the blower wheel from FIG. 1.

[0023] FIGS. 1 and 2 show a one-piece blower wheel 10 having a bottom disk 12 and a cover disk 11 between which a blade ring is formed having multiple blower wheel blades 13 disposed in the circumferential direction at a spacing from one another. The cover disk 11 comprises an axial intake opening 25 having a diameter di, which extends in a funnel-shaped curve when viewed in a radial section and forms an inlet nozzle at the intake opening 25. The outermost radial section of the cover disk 11 and the entire bottom disk 12 each extend parallel to an axial plane, that is, perpendicular to the axis of rotation of the blower wheel 1.

[0024] At its circumferential edge 14, which defines the intake opening 25, the cover disk 11 has a thickness t which corresponds to the thickness t of the blower wheel blades 13. The bottom disk 12 also has the thickness t on its radially outer edge 15 and is flush in a plane with an radially outer edge 18 of the blower wheel blades 13, which edge extends in a plane parallel to the axis of rotation of the blower wheel 1. The material thickness t of the bottom and cover disks 12, 11 is constant from radially inside to radially outside over their overall extension.

[0025] The bottom disk 12 extends radially inwards from the radially outer edges 18 of the blower wheel blades 13 and directly covers sections of the axial front sides of the blower wheel blades 13, wherein the bottom and cover disks, 12, 11 do not overlap in an axial top view, as viewed in a projection.

[0026] The size ratios of the blower wheel 1 are essential in fluidic respect and for solving the technological problem. The bottom disk 12 defines a maximum radial diameter da. The cover disk 11 extends radially outwards from the circumferential edge 14 which forms the intake opening 25 and has a maximum outer diameter dt. The ratio of the outer diameters dt/da is a preferred 0.74 in the exemplary embodiment shown. Furthermore, the di/dt ratio is at a value of 0.6. The maximum variation is 0.3.

[0027] The cover disk 11 forms the part of the blower wheel 1 located radially inside on the intake side and covers sections of the blower wheel blades 13 in the area of the intake opening 25. The bottom disk 12 covers the blower wheel blades 13 in the area located radially outside. The blower wheel blades 13 extend in a straight line from the radially outer edge 19 of the cover disk 11, but inclined radially outwards in the circumferential direction. The axial front sides 17 of the blower wheel blades 13 have free ends and are uncovered on a side opposite the bottom disk 12.

[0028] The blower wheel 10 further comprises a hub 16 into which the blower wheel blades 13 transition on their radially inner sides, wherein the radially inner edges 20 of the blower wheel blades 13 are arc-shaped.