Flame protected optic

Patent metadata

Field	Value
Publication number	US-12038154-B2
Application number	US-202217574249-A
Country	US
Kind code	B2
Filing date	Jan 12, 2022
Priority date	Jan 12, 2021
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

Abstract

Various embodiments described herein are directed to luminaire components that prevent flame transmission from the inside of a luminaire to the outside of a luminaire. In certain aspects, the luminaire can be used in an environment containing flammable gas, for example, in specialized lab work or testing applications. This application discusses components that can be used to prevent flame transmission from the inside of a luminaire to the outside of a luminaire, thereby yielding a flame encapsulating luminaire. Accordingly, the components and assemblies described herein can be safely integrated with systems that operate in the presence flammable gas.

First claim

What is claimed is:

1. A luminaire system comprising:
a luminaire enclosure comprising a luminaire enclosure cover and a luminaire enclosure backing;
a pcb board, disposed in the luminaire enclosure and including one or more light emitters; an LED protective lens array including a plurality of protective lenses, overlaying the pcb board and over the one or more light emitters;
a clamp plate, overlaying the LED protective lens array; and, a luminaire
flame protected lens disposed in the luminaire enclosure cover,
wherein a luminaire cavity is defined within the luminaire enclosure between the protective lens array and the luminaire lens,
wherein the LED protective lens array is configured to be secured to the pcb board such that the protective lenses overlay the one or more light emitters, and such that a mechanical seal that disallows a flame from travelling into or out of at least one of the protective lenses when the mechanical seal is formed between each of the protective lens of the LED protective lens array and the pcb board.

2. The luminaire system of claim 1 , wherein the pcb board is secured to the luminaire enclosure backing by mechanical fasteners.

3. The luminaire system of claim 2 , wherein the protective lens array is secured to the pcb board by the mechanical fasteners, and wherein the clamp plate is secured to the protective lens array by the mechanical fasteners.

4. The luminaire system of claim 1 , wherein the luminaire enclosure cover includes a lens accommodating window having an outer bezel lip and an inner bezel lip, and wherein the luminaire lens is retained between the outer bezel lip and the bezel lip of the lens accommodating window.

5. The luminaire system of claim 4 , wherein the luminaire flame protected lens includes a first lens surface and a second lens surface opposite to the first lens surface, wherein the outer bezel lip contacts the first lens surface, and wherein the inner bezel lip contacts the second lens surface.

6. The luminaire system of claim 1 , wherein the luminaire enclosure further comprises a heatsink in thermal communication with the pcb board.

7. The luminaire system of claim 1 , wherein the luminaire enclosure comprises a heat conductive material and acts as a heatsink for the pcb board.

8. The luminaire system of claim 1 , wherein the light emitter is an LED.

9. The luminaire system of claim 1 , wherein the luminaire flame protected lens is sealingly coupled to the luminaire enclosure cover.

10. The luminaire system of claim 1 , wherein:
the luminaire flame protected lens includes a first lens surface and a second lens surface opposite to the first lens surface;
the luminaire enclosure backing includes a first surface and a recessed portion that has a mounting surface for the pcb board, wherein the mounting surface is recessed relative to the first surface; and
the first lens surface is sealingly connected to the enclosure cover and the second lens surface faces the mounting surface and the pcb board;
wherein the luminaire cavity is formed between the mounting surface and the second lens surface; and
wherein the second lens surface is flush with the first surface such that the depth of the recessed portion is substantially equal to the height of the luminaire cavity.

11. An LED protective luminaire lens array comprising:
a plurality of LED protective lenses, each including an LED accommodating cavity;
an aperture configured to receive a mechanical fastener; and,
a fastener accommodating cutout at a corner of the LED protective lens array,

wherein the LED protective lens array is configured to be attached to a pcb board by way of mechanical fasteners interacting with the pcb board via at least one of the aperture or the fastener accommodating cutout,
wherein the LED accommodating cavities are configured to overlay a plurality of individual LED elements disposed on the pcb board, and
wherein attaching the LED protective lens array to the pcb board forms a mechanical seal between the LED protective lens array and the pcb board that disallows a flame from travelling into or out of at least one of the LED accommodating cavities when the mechanical seal is attached between each of the LED protective lens array to the pcb board.

12. The LED protective lens array of claim 11 wherein the LED protective lenses are in a rectangular configuration.

13. The LED protective lens array of claim 11 wherein the aperture is disposed in the center of the LED protective lens array.

14. The LED protective lens array of claim 11 wherein the LED accommodating cavity includes a plurality of inner walls forming tiered, concentric, conical cavities of differing slopes, diameters, and heights.

15. A flame protected luminaire enclosure comprising:
a luminaire enclosure cover including a luminaire lens and a plurality enclosure fastener accommodating apertures disposed along a perimeter of the luminaire enclosure cover;
an LED protective lens array including a plurality of protective lenses;
a luminaire enclosure backing configured to be joined to the luminaire enclosure cover by the enclosure fasteners; and
a luminaire cavity defined by a space extending between the luminaire lens and the luminaire enclosure backing,
wherein the size of the luminaire cavity is determined based on a flame encapsulating protective standard for enclosures, and
wherein the LED protective lens array is configured to be secured to the luminaire enclosure backing over pcb board such that each of the LED protective lenses form a mechanical seal against the pcb that disallows a flame from travelling into or out of at least one protective lens of the LED protective lens array.

16. The luminaire enclosure of claim 15 further including an adaptor configured to connect to a power or data wire and provide power or data to a pcb board housed in the luminaire enclosure.

17. The luminaire enclosure of claim 15 further including a gasket disposed between the luminaire enclosure cover and the luminaire enclosure backing, wherein the gasket is disposed radially outside of an outer perimeter of the luminaire lens.

18. The luminaire enclosure of claim 15 further including a hollow compartment disposed on a backside of the luminaire enclosure backing, and wherein the hollow compartment further includes mounting equipment configured to mount the luminaire enclosure backing to a surface.

19. The luminaire enclosure of claim 15 , wherein the luminaire enclosure cover and luminaire enclosure backing are configured to form a seam when joined together by the enclosure fasteners, and wherein a flame path is formed in the seam when joined together by the enclosure fasteners.

20. The flame protected luminaire enclosure of claim 15 , wherein:
the luminaire lens includes a first lens surface and a second lens surface opposite to the first lens surface;
the luminaire enclosure backing includes a first surface and a recessed portion that has a mounting surface for the pcb board, wherein the mounting surface is recessed relative to the first surface; and
the first lens surface is sealingly connected to the enclosure cover and the second surface faces the mounting surface and the pcb board;
wherein the luminaire cavity is formed between the mounting surface and the second lens surface; and
wherein the second lens surface is flush with the first surface such that the depth of the recessed portion is substantially equal to the height of the luminaire cavity.

Assignees

• Hubbell Inc

Inventors

• Dachlan Ivon
• Camillo Paolo

Classifications

• F21V29/70

  characterised by passive heat-dissipating elements, e.g. heat-sinks · CPC title

• F21V15/01

  Housings, e.g. material or assembling of housing parts (F21V15/02 takes precedence {housings forming signs or letters G09F13/04}) · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21V19/003

  Fastening of light source holders, e.g. of circuit boards or substrates holding light sources · CPC title

• F21V17/12

  by screwing · CPC title