Burner box liner for low NOx emission furnace

Patent metadata

Field	Value
Publication number	US-10711997-B2
Application number	US-201715723564-A
Country	US
Kind code	B2
Filing date	Oct 3, 2017
Priority date	Oct 3, 2017
Publication date	Jul 14, 2020
Grant date	Jul 14, 2020

Abstract

A burner box assembly according to aspects of the disclosure includes an outer cover, the outer cover having a sloped bottom face that directs condensation away from a heat-exchange tube, a heat-resistant liner having a plurality of panel members, the heat-resistant liner being disposed within the outer cover, a shield disposed between the heat-resistant liner and the sloped bottom face of the outer cover such that an air gap is formed between the shield and the sloped bottom face, and a tubular member abutting at least one of the plurality of panel members and disposed within the heat-exchange tube.

First claim

What is claimed is:

1. A burner box assembly comprising:
an outer cover having a top face and a bottom face;
a heat-resistant liner comprising a plurality of panel members, wherein the plurality of panel members comprise a top panel member in generally parallel alignment to a bottom panel and perpendicular to oppositely-disposed panels, the heat-resistant liner disposed within the outer cover;
wherein the top face is in general parallel alignment with the top panel member and the bottom face is sloped downward relative to the top face such that the bottom face directs condensation away from a heat-exchange tube;
a shield disposed between the heat-resistant liner and the bottom face of the outer cover such that an air gap is formed between the shield and the bottom face; and
a tubular member abutting at least one of the plurality of panel members and disposed within the heat-exchange tube.

2. The burner box assembly of claim 1 , wherein the heat-resistant liner is constructed of a ceramic.

3. The burner box assembly of claim 2 , wherein the tubular member is constructed of a ceramic.

4. The burner box assembly of claim 2 , wherein the tubular member is constructed of a nickel-chromium alloy.

5. The burner box assembly of claim 1 , wherein the heat-resistant liner is constructed of a nickel-chromium alloy.

6. The burner box assembly of claim 5 , wherein the tubular member is constructed of a ceramic.

7. The burner box assembly of claim 5 , wherein the tubular member is constructed of a nickel-chromium alloy.

8. The burner box assembly of claim 1 , wherein the heat-resistant liner is a mesh.

9. The burner box assembly of claim 1 , wherein the tubular member has a length in a range of approximately one inch to approximately ten inches.

10. The burner box assembly of claim 1 , wherein:
the outer cover comprises a first aperture formed therein and coupled to the heat-exchange tube;
the heat-resistant liner comprises a second aperture formed therein; and
the first aperture aligns with the second aperture.

11. The burner box assembly of claim 1 , wherein the heat-resistant liner comprises an open rear face that receives at least a portion of, and is thermally exposed to, a pre-mix burner.

12. A burner box assembly comprising:
an outer cover having a top face and a bottom face;
a heat-resistant liner comprising a plurality of panel members, wherein the plurality of panel members comprise a top panel member in generally parallel alignment to a bottom panel and perpendicular to oppositely-disposed panels, the heat-resistant liner disposed within the outer cover;
wherein the top face is in general parallel alignment with the top panel member and the bottom face is sloped downward relative to the top face such that the bottom face directs condensation away from a heat-exchange tube; and
a tubular member coupled to at least one of the plurality of panel members and disposed within the heat-exchange tube.

13. The burner box assembly of claim 12 , wherein the heat-resistant liner removably abuts interior surfaces of the outer cover.

14. The burner box assembly of claim 12 , wherein the heat-resistant liner lines interior surfaces of the outer cover.

15. The burner box assembly of claim 12 , wherein the heat-resistant liner comprises an open rear face that receives at least a portion of, and is thermally exposed to, a pre-mix burner.

16. A furnace assembly comprising:
a fresh-air intake;
a supply line fluidly coupled to the fresh-air intake;
an intake manifold fluidly coupled to the supply line;
a pre-mix burner fluidly coupled to the intake manifold;
a burner box assembly containing at least a portion of the pre-mix burner, the burner box assembly being thermally exposed to the pre-mix burner, the burner box assembly comprising:
an outer cover having a top face and a bottom face;
a heat-resistant liner comprising a plurality of panel members, wherein the plurality of panel members comprise a top panel member in generally parallel alignment to a bottom panel and perpendicular to oppositely-disposed panels, the heat-resistant liner disposed within the outer cover
wherein the top face is in general parallel alignment with the top panel member and the bottom face is sloped downward relative to the top face; and
a tubular member abutting at least one of the plurality of panel members and disposed within a heat-exchange tube;

the heat-exchange tube being fluidly coupled to the burner box assembly; and
a fan fluidly coupled to the heat-exchange tube.

17. The furnace assembly of claim 16 , wherein the heat-resistant liner is constructed of a ceramic.

18. The furnace assembly of claim 16 , wherein the heat-resistant liner is constructed of a nickel-chromium alloy.

19. The furnace assembly of claim 18 , wherein the heat-resistant liner is a mesh.

20. The furnace assembly of claim 18 , wherein:
the bottom face directs condensation away from the heat-exchange tube; and
a shield is disposed between the heat-resistant liner and the bottom face such that an air gap is formed between the shield and the bottom face.

Assignees

• Lennox Ind Inc

Inventors

• Perez Eric
• Poirier Randal
• Chanthalangsy Eric
• Schneider Steven

Classifications

• F24H9/0068

  in combustion gas channels · CPC title

• F23D14/02 Primary

  Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone · CPC title

• F24H8/006

  Means for removing condensate from the heater · CPC title

• F23L17/005

  using fans · CPC title

• F23D14/62

  Mixing devices; Mixing tubes · CPC title