Fan wheel, fan, and system having at least one fan

1. A fan wheel for a radial fan or diagonal fan, the fan wheel comprising:

at least two fan blades;

a hub ring; and

a cover ring,

wherein:

the at least two fan blades extend between the hub ring and the cover ring and are secured to both the hub ring and the cover ring;

a blade profile of each of the at least two fan blades has a wavy shape;

each of the at least two fan blades locally joins the hub ring at an angle of 75° to 105°;

each of the at least two fan blades locally joins the cover ring at an angle of 75° to 105°;

for each of the at least two fan blades, a curvature of the blade profile extends from a blade leading edge to a blade trailing edge;

an outer face of the cover ring is concave;

the wavy shape is a sine wave shape; and

the sine wave has at least one of:

lengths with amplitudes of at least one of 3 mm to 50 mm and between 0.5 and 5% of a maximum diameter of the fan wheel; and

angles with amplitudes of 0.3° to 3°.

2. The fan wheel according to claim 1 , wherein each of the at least two fan blades is produced from sheet material.

3. The fan wheel according to claim 2 , wherein the sheet material includes metal.

4. The fan wheel according to claim 2 , wherein the sheet material includes plastic.

5. The fan wheel according to claim 1 , wherein the fan wheel is cast.

6. The fan wheel according to claim 5 , wherein the fan wheel includes metal.

7. The fan wheel according to claim 5 , wherein the fan wheel includes plastic.

8. A fan comprising the fan wheel according to claim 1 .

9. A system comprising the fan according to claim 8 .

10. The fan wheel according to claim 1 , wherein each of the at least two fan blades locally joins the hub ring at the angle of 90°.

11. The fan wheel according to claim 1 , wherein each of the at least two fan blades locally joins the cover ring at the angle of 90°.