Combustion apparatus and hot water apparatus

Abstract

A combustion apparatus includes a burner, a chamber, and a flame rod. The burner includes a burner port surface in which a plurality of burner ports are open. The chamber includes an attachment surface to which the burner is attached and supplies mixed gas to the plurality of burner ports. The flame rod is attached to a flange portion of a chamber located on an outer circumference side of the burner in plan view. The flame rod includes a core. The core extends diagonally to the attachment surface to pass through the chamber, and is bent toward the burner port surface.

What is claimed is: 
     
         1 . A combustion apparatus comprising:
 a burner including a burner port surface in which a plurality of burner ports are open;   a chamber including an attachment surface to which the burner is attached, the chamber supplying mixed gas to the plurality of burner ports; and   a flame rod attached to an outer circumferential portion of the chamber which is located on an outer circumference side of the burner in plan view, the flame rod including a core,   wherein the core extends diagonally to the attachment surface to pass through the chamber, and is bent toward the burner port surface.   
     
     
         2 . The combustion apparatus according to  claim 1 , wherein
 the core includes a first portion having a tip end and disposed to extend along the burner port surface, and   the tip end is disposed opposite to the chamber with respect to the burner port surface and is disposed to overlap the burner in plan view.   
     
     
         3 . The combustion apparatus according to  claim 2 , wherein the core includes
 a second portion inserted into the chamber,   a third portion disposed between the first portion and the second portion,   a first bent portion connecting the first portion and the third portion to each other, and   a second bent portion connecting the second portion and the third portion to each other.   
     
     
         4 . The combustion apparatus according to  claim 1 , further comprising a burner flange disposed between the burner and the core such that at least part of the burner flange overlaps an outer edge portion of the burner in plan view. 
     
     
         5 . The combustion apparatus according to  claim 4 , wherein the burner flange is provided such that when the flame rod inserted into the chamber is disposed at a position different from a predetermined attachment position, the burner flange is disposed between the burner port surface and the core to prevent the core disposed at the different position from contacting the burner port surface. 
     
     
         6 . The combustion apparatus according to  claim 4 , wherein
 the burner has a fibrous structure, and   the burner flange has a structure having a shape of a plate made of metal material, the structure being more resistant to damage upon contact with the flame rod than the fibrous structure of the burner.   
     
     
         7 . The combustion apparatus according to  claim 1 , wherein
 the outer circumferential portion has
 a through-hole into which the flame rod is inserted, and 
 a recess connected to an end on a burner side of the through-hole, and 
   the recess in a first direction extending toward an outer circumference of the burner has a width smaller than a width of the recess in a second direction orthogonal to the first direction.   
     
     
         8 . The combustion apparatus according to  claim 1 , wherein
 the flame rod further includes an insulator covering part of the core,   the combustion apparatus further comprises a fixing portion that fixes the flame rod to the chamber,   the fixing portion has an insertion hole into which the insulator is inserted,   the insertion hole is provided to position the inserted flame rod with respect to the fixing portion,   the fixing portion includes an engagement portion that engages with the chamber, and   the engagement portion is provided to position the fixing portion with respect to the chamber.   
     
     
         9 . A hot water apparatus comprising:
 a combustion apparatus according to  claim 1 ; and   a heat exchange unit that heats hot water by combustion gas generated through combustion of mixed gas in the combustion apparatus.   
     
     
         10 . The combustion apparatus according to  claim 2 , further comprising a burner flange disposed between the burner and the core such that at least part of the burner flange overlaps an outer edge of the burner in plan view. 
     
     
         11 . The combustion apparatus according to  claim 10 , wherein the burner flange is provided such that when the flame rod inserted into the chamber is disposed at a position different from a predetermined attachment position, the burner flange is disposed between the burner port surface and the core to prevent the core disposed at the different position from contacting the burner port surface. 
     
     
         12 . The combustion apparatus according to  claim 3 , further comprising a burner flange disposed between the burner and the core such that at least part of the burner flange overlaps an outer edge of the burner in plan view. 
     
     
         13 . The combustion apparatus according to  claim 12 , wherein the burner flange is provided such that when the flame rod inserted into the chamber is disposed at a position different from a predetermined attachment position, the burner flange is disposed between the burner port surface and the core to prevent the core disposed at the different position from contacting the burner port surface. 
     
     
         14 . The combustion apparatus according to  claim 2 , wherein
 the outer circumferential portion has
 a through-hole into which the flame rod is inserted, and 
 a recess connected to an end on a burner side of the through-hole, and 
   the recess in a first direction extending toward an outer circumference of the burner has a width smaller than a width of the recess in a second direction orthogonal to the first direction.   
     
     
         15 . The combustion apparatus according to  claim 3 , wherein
 the outer circumferential portion has
 a through-hole into which the flame rod is inserted, and 
 a recess connected to an end on a burner side of the through-hole, and 
   the recess in a first direction extending toward an outer circumference of the burner has a width smaller than a width of the recess in a second direction orthogonal to the first direction.