Fan assembly with ultra violet disinfection
A fan assembly includes an electric motor; a rotor driven by the electric motor to rotate about an axis of rotation, and a plurality of blades, for example airfoil shaped blades, attached to the rotor. At least one blade includes a lighting assembly having an ultraviolet light source mounted inside an internal cavity proximal to an end of a blade body of the at least one blade such that the outer shape of the blade is generally unchanged by the lighting assembly.
1. A fan assembly comprising:
an electric motor;
a rotor driven by the electric motor to rotate about an axis of rotation;
a plurality of blades attached to the rotor, each blade having a blade body extending between first and second ends, the blade body being mounted to the rotor at the first end, the blade body having an airfoil-shaped profile defined by a top surface and a bottom surface arranged between a leading edge and a trailing edge, the profile of the blade body imparting motion on air when rotated by the rotor about the axis of rotation, and the blade body further having an internal cavity extending between the first and second ends; and
a lighting assembly housed inside at least one blade of the plurality of blades, the lighting assembly including:
an ultraviolet light source mounted inside the internal cavity proximal to the second end of the blade body; and
an electrical ballast configured to supply an electrical current to the ultraviolet light source, the electrical ballast being mounted inside the internal cavity proximal to the first end of the blade body.
2. The fan assembly of claim 1 , further comprising:
a slip ring configured to transfer electrical current from the electric motor to the electrical ballast while allowing the electrical ballast to rotate about the axis of rotation.
3. The fan assembly of claim 1 , wherein the lighting assembly includes a window positioned over the ultraviolet light source.
4. The fan assembly of claim 1 , wherein the lighting assembly includes an aperture shield positioned over the ultraviolet light source.
5. The fan assembly of claim 1 , wherein the lighting assembly includes a reflector mounted inside the internal cavity to at least partially surround the ultraviolet light source.
6. The fan assembly of claim 1 , wherein the lighting assembly includes two or more ultraviolet light sources, and a controller configured to control the two or more ultraviolet light sources such that one, two, or more ultraviolet light sources are active at a time.
7. The fan assembly of claim 1 , wherein the plurality of blades includes between three and eight blades attached to the rotor.
8. The fan assembly of claim 7 , wherein each of the plurality of blades includes a lighting assembly.
9. The fan assembly of claim 8 , wherein the fan assembly is a high-volume low speed fan.
10. A blade assembly for a fan, the blade assembly comprising:
a blade body extending between first and second ends, the blade body configured for mounting to a rotor at the first end, the blade body having an airfoil-shaped profile defined by a top surface and a bottom surface arranged between a leading edge and a trailing edge, and the blade body further having an internal cavity extending between the first and second ends; and
a lighting assembly at least partially housed inside the blade body, the lighting assembly including:
an ultraviolet light source mounted at least partially inside the internal cavity proximal to the second end of the blade body;
an electrical ballast configured to supply an electrical current to the ultraviolet light source, the electrical ballast being mounted inside the internal cavity proximal to the first end of the blade body;
a receptacle assembly attached to the second end of the blade body, the receptacle assembly including:
a socket configured to receive one end of the ultraviolet light source; and
one or more fasteners for removably attaching the receptacle assembly to the second end of the blade body; and
a window positioned over the ultraviolet light source, the window being continuous with the leading edge of the blade body, wherein the window is removably attached to the blade body between a first tab on the receptacle assembly and a second tab on the blade body.
11. The blade assembly of claim 10 , further comprising:
brackets for fixing the electrical ballast inside the internal cavity.
12. The blade assembly of claim 10 , wherein the socket is connected to the electrical ballast for supplying the electrical current to the ultraviolet light source.
13. The blade assembly of claim 10 , wherein the lighting assembly includes two or more ultraviolet light sources, each ultraviolet light source being independently controllable.
14. A receptacle assembly for removable attachment to an end of a blade body, the receptacle assembly comprising:
a socket configured to receive at least one ultraviolet light source, the socket configured for connection to an electrical ballast for supplying an electrical current to the at least one ultraviolet light source; and
one or more mechanical fasteners for removably attaching the receptacle assembly to the end of the blade body; and
a tab configured to secure a window over the ultraviolet light source.
15. The receptacle assembly of claim 14 , wherein the receptacle assembly defines an exterior surface that matches a profile of the blade body including a top surface and a bottom surface arranged between a leading edge and a trailing edge.