Combustion apparatus

• US 8,186,996 B2
• Filed: 03/03/2009
• Issued: 05/29/2012
• Est. Priority Date: 03/04/2008
• Status: Active Grant

• Current Assignee: Rinnai Corporation
• Original Assignee: Rinnai Corporation
• Inventors: Ojiro, Takashi
• Primary Examiner(s): McAllister, Steven B
• Assistant Examiner(s): MASHRUWALA, NIKHIL P
• Application Number:
  US12/396,641
• Publication Number:
  US 20090226854A1
• Time in Patent Office: 1,183 Days
• Field of Search: 431/351, 431/181, 431/12, 126/92.R, 126/92.AC
• US Class Current: 431/351
• CPC Class Codes: F23D 14/78 Cooling burner parts
• CPC Class Codes: F23M 5/085 using air or other gas as the cooling medium

Abstract

Provided is a combustion apparatus capable of preventing a heat loss from a combustion cabinet without deteriorating a combustion performance thereof. According to the present invention, a part of an inner side surface of a combustion cabinet (1), which encloses a combustion chamber where a mixture gas erupted from a combustion plate (22) is combusted, is covered with a cover (7) made of an insulation material; and the cover (7) is provided with a concave portion (7a) at an outer side surface thereof having contact with the inner side surface of the combustion cabinet (1), and an insulation air layer (7b) is defined by the concave portion (7a).

Claims

1. A combustion apparatus provided with an all primary combustion burner housed in a combustion cabinet, the all primary combustion burner having a combustion plate with a plurality of burner ports disposed on a top thereof, and the combustion cabinet having an inner side surface which encloses a combustion chamber where a mixture gas erupted from the combustion plate is combusted,

wherein a cover made of an insulating material covers a part of the inner side surface of the combustion cabinet;

wherein the cover has an outer side surface disposed to be in contact with the inner side surface of the combustion cabinet, and a cover inner side surface opposite to the outer side surface of the cover, the outer side surface of the cover having a recessed portion defined therein such that the outer side surface of the cover and the inner side surface of the combustion cabinet enclose an insulation air layer area, the insulation air layer area bounded by the outer side surface of the cover and the inner side surface of the combustion cabinet so as to be provided by the recessed portion defined in the outer side surface of the cover; and

wherein the cover is formed such that the insulation air layer area has a thickness in a range of 28% to 44% of a total thickness of the cover from the inner side surface of the combustion cabinet to the inner side surface of the cover;

wherein an upper edge of the cover inner surface is formed with a beveled portion;

wherein the cover is disposed so as to be entirely above an uppermost position of the all primary combustion burner.

2. The combustion apparatus according to claim 1, wherein the cover includes a lower side surface facing a bottom of the combustion apparatus, and an upper side surface opposite to the lower side surface, the upper side surface and lower side surface of the cover being connected by the outer side surface of the cover and the cover inner side surface, and

an intersection of the cover inner side surface and the upper side surface of the cover is the upper edge of the cover inner side surface which is formed as the beveled portion.

3. The combustion apparatus according to claim 1, wherein the combustion cabinet has an upper edge spaced from an uppermost portion of the all primary combustion burner, and the cover is entirely disposed between the upper edge of the combustion cabinet and the uppermost portion of the all primary combustion burner.

4. The combustion apparatus according to claim 1, wherein the outer side surface of the cover includes an upper leg disposed at an upper portion thereof, a lower leg disposed at a lower portion thereof, and a recessed surface which is recessed from a distal end of the upper and lower legs and is disposed between the upper and lower legs, the recessed surface and the upper and lower legs defining the recessed portion of the cover, and

the distal end of the upper leg and the distal end of the lower leg abut the inner side surface of the combustion cabinet, and the recessed surface is spaced from the inner side surface of the combustion cabinet.

5. The combustion apparatus according to claim 1, wherein the cover and the inner side surface of the combustion cabinet cooperate to bound the insulation air layer area such that the insulation air layer area continuously and entirely surrounds the all primary combustion burner.

6. The combustion apparatus according to claim 1, wherein the cover is formed from four leg portions joined such that the cover has a hollow rectangular shape when viewed from above.

7. The combustion apparatus according to claim 6, wherein each of the cover leg portions have an outer side surface with a recessed portion defined therein, and the outer side surface of each of the cover leg portions is in contact with the inner side surface of the combustion cabinet.

8. The combustion apparatus according to claim 2, wherein the cover is disposed such that the lower side surface of the cover is entirely above an uppermost portion of the all primary combustion burner.

9. The combustion apparatus according to claim 2, wherein the combustion cabinet has an upper edge spaced from an uppermost portion of the all primary combustion burner, and the cover is disposed such that the upper side surface of the cover is entirely below the upper edge of the combustion cabinet and lower side surface of the cover is entirely above the uppermost portion of the all primary combustion burner.

10. The combustion apparatus according to claim 2, wherein the outer side surface of the cover includes an upper leg disposed at an upper portion thereof, a lower leg disposed at a lower portion thereof, and a recessed surface which is recessed from a distal end of the upper and lower legs and is disposed between the upper and lower legs, the recessed surface and the upper and lower legs defining the recessed portion of the cover, and

the distal end of the upper leg and the distal end of the lower leg abut the inner side surface of the combustion cabinet, and the recessed surface is spaced from the inner side surface of the combustion cabinet.

11. The combustion apparatus according to claim 2, wherein the cover and the inner side surface of the combustion cabinet cooperate to bound the insulation air layer area such that the insulation air layer area continuously and entirely surrounds the all primary combustion burner.

12. The combustion apparatus according to claim 11, wherein each of the cover leg portions have an outer side surface with a recessed portion defined therein, and the outer side surface of each of the cover leg portions is in contact with the inner side surface of the combustion cabinet.

13. The combustion apparatus according to claim 2, wherein the cover is formed from four leg portions joined such that the cover has a hollow rectangular shape when viewed from above.