Gas furnace

Patent metadata

Field	Value
Publication number	US-11428403-B2
Application number	US-202016898668-A
Country	US
Kind code	B2
Filing date	Jun 11, 2020
Priority date	Jun 14, 2019
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A gas furnace includes a mixing pipe through which a mixture formed by mixing fuel gas and air flows; a burner assembly that generates combustion gas by burning the mixture that passed through the mixing pipe; and a heat exchanger through which the combustion gas flows. In this case, the burner assembly includes a burner in which flame generated when the mixture is burned is seated; and a mixing chamber that mediates delivery of the mixture from the mixing pipe to the burner, thereby significantly reducing NOx emission.

First claim

What is claimed is:

1. A gas furnace, comprising:
a mixing pipe through which a mixture of fuel gas and air flows;
a burner assembly that burns the mixture that passed through the mixing pipe; and
a plurality of heat exchangers through which a combustion gas generated in the burner assembly flows,
wherein the burner assembly comprises:
a plurality of burners in which flame generated when the mixture is burned is seated;
a mixing chamber that provides the mixture from the mixing pipe to the plurality of burners;
a burner plate which is opposite to the mixing chamber with respect to the plurality of burners, and to which the plurality of burners are coupled; and
a plurality of combustion chambers positioned between the burner plate and the plurality of heat exchangers, and configured to communicate with the plurality of heat exchangers,
wherein the burner plate has a plurality of burner holes positioned between the plurality of burners and the plurality of combustion chambers, and a flame propagation opening positioned between the plurality of burner holes,
wherein a portion of each of the plurality of burners surrounds at least a portion of the flame propagation opening.

2. The gas furnace of claim 1 , wherein the number of the plurality of heat exchangers is equal to the number of the plurality of burners.

3. The gas furnace of claim 1 , wherein the mixing chamber is positioned in a front end of the plurality of burners, and guides the mixture passed through the mixing pipe to the plurality of burners and the flame propagation opening.

4. The gas furnace of claim 3 , wherein the burner assembly further comprises a flame propagation tunnel that is formed between the plurality of adjacent combustion chambers, as a position corresponding to a position where the flame propagation opening is formed, and forms a flame propagation passage between the flame propagation opening and the flame propagation tunnel.

5. The gas furnace of claim 1 , wherein the flame propagation opening is formed by arranging a plurality of holes consecutively.

6. The gas furnace of claim 5 , wherein the plurality of holes forming the flame propagation opening have a same diameter, and are formed to be arranged side by side with each other.

7. The gas furnace of claim 5 , further comprising a connector formed at one side of the mixing chamber, and the connector to connect to the mixing pipe,
wherein the plurality of holes forming the flame propagation opening is arranged side by side, and formed to have a diameter that becomes larger as a distance from the connector increases.

8. The gas furnace of claim 5 , wherein the plurality of holes forming the flame propagation opening have a same diameter, and are arranged to cross each other.

9. The gas furnace of claim 1 , wherein the burner comprises:
a burner perforated plate in which a plurality of ports through which the mixture passed through the mixing chamber is ejected is formed; and
a burner mat which is coupled to an upper side of the burner perforated plate and uniformly disperses the mixture ejected through the port.

10. The gas furnace of claim 9 , wherein the burner mat is formed of a metal fiber material having a gap smaller than a diameter of the port.

11. The gas furnace of claim 9 , wherein each of the burner perforated plate and the burner mat forms a concave portion as a part of a side surface is bent toward an inside so as to surround at least a portion of adjacent flame propagation opening.

12. The gas furnace of claim 11 , wherein each of the burner perforated plate and the burner mat has a shape, which constitutes a part of a circle, that is formed symmetrically based on the concave portion.

13. The gas furnace of claim 1 , further comprising;
a connector formed at one side of the mixing chamber, and the connector to connect to the mixing pipe; and
an igniter which is positioned inside a combustion chamber closest to the connector among the plurality of combustion chambers, and is configured to ignite the mixture.

14. The gas furnace of claim 13 , further comprising a flame detector which is positioned inside a combustion chamber disposed in a position farthest from a combustion chamber in which the igniter is installed among the plurality of combustion chambers, and is configured to detect whether the flame is generated.

15. The gas furnace of claim 1 , further comprising:
an exhaust pipe that discharges combustion gas that passed through the heat exchanger to an outside; and
an inducer that causes a flow of the mixture from the mixing pipe to the burner assembly, and causes a flow of the combustion gas from the burner assembly to the heat exchanger and the exhaust pipe.

16. The gas furnace of claim 1 , further comprising:
a mixer that forms the mixture by mixing air and fuel gas introduced from each of an intake pipe and a manifold,
wherein the mixer comprises:
a mixer housing having a front end to which the intake pipe is connected, a rear end to which the mixing pipe is connected, and a side surface to which the manifold is connected; and
a venturi tube located inside the mixer housing.

17. The gas furnace of claim 16 , wherein the venturi tube comprises:
a converging section having one end in which an inlet through which the air passed through the intake pipe flows is formed;
a throat which is connected to the converging section, and has a fuel inflow hole, through which fuel gas passed through the manifold is introduced, that is formed in at least a portion of a side surface; and
a diverging section which is connected to the throat, forms and flows a mixture by mixing air and fuel gas passed through each of the converging section and the fuel inflow hole, and has one end in which a discharge portion for discharging the mixture to the mixing pipe is formed.

18. The gas furnace of claim 17 , wherein the converging section is formed to decrease in diameter toward a downstream direction,
wherein the diverging section is formed to increase in diameter toward the downstream direction.

Assignees

• Lg Electronics Inc

Inventors

• Park Janghee
• Kim Jusu
• PARK Hansaem
• Jeong Yongki
• Ha Doyong

Classifications

• F23D99/004

  for use in particular heating operations · CPC title

• F23D14/64

  with injectors · CPC title

• F23C3/002

  the chamber having an elongated tubular form, e.g. for a radiant tube · CPC title

• F23D14/62

  Mixing devices; Mixing tubes · CPC title

• F23C6/04

  in series connection (consuming smoke or fumes in separate combustion apparatus F23G7/06) · CPC title