Exhaust structure for combustion apparatus

Abstract

An exhaust structure for a combustion apparatus includes a combustion apparatus, an exhaust tube, an exhaust pipe, an exhaust adapter, and a fixing member. The exhaust tube is connected to the combustion apparatus at the one end portion. A part of the exhaust tube on a side of the other end portion is inserted into the exhaust pipe. The exhaust adapter has an annular shape surrounding a through hole, and is attached to an outer circumferential surface of the exhaust tube and to an inner circumferential surface of the exhaust pipe by inserting the exhaust tube into the through hole. The fixing member is formed of an elastic body, attached to the exhaust pipe at a position close to the combustion apparatus relative to the exhaust adapter, and fixes the exhaust tube to the exhaust pipe while being attached to the outer circumferential surface of the exhaust tube.

What is claimed is: 
     
         1 . An exhaust structure for combustion apparatus, comprising:
 a combustion apparatus;   an exhaust tube having one end portion and the other end portion, and connected to said combustion apparatus at said one end portion;   an exhaust pipe, in which a part of said exhaust tube on a side of said other end portion being inserted;   an exhaust adapter having an annular shape surrounding a through hole, and attached to an outer circumferential surface of said exhaust tube and to an inner circumferential surface of said exhaust pipe by inserting said exhaust tube into said through hole; and   a fixing member formed of an elastic body, attached to said exhaust pipe at a position close to said combustion apparatus relative to said exhaust adapter, and fixing said exhaust tube to said exhaust pipe while being attached to the outer circumferential surface of said exhaust tube.   
     
     
         2 . The exhaust structure for combustion apparatus according to  claim 1 , wherein
 said fixing member includes
 a first fixing portion attached to said exhaust tube, 
 a second fixing portion attached to said exhaust pipe, and 
 a main body portion connecting said first fixing portion and said second fixing portion, and 
   said main body portion has a communication hole that allows communication between a first region and a second region separated from said first region by said main body portion, said first region being located between the outer circumferential surface of said exhaust tube and the inner circumferential surface of said exhaust pipe.   
     
     
         3 . The exhaust structure for combustion apparatus according to  claim 2 , wherein said first fixing portion and said second fixing portion each have a cylindrical shape and are concentrically arranged. 
     
     
         4 . The exhaust structure for combustion apparatus according to  claim 2 , further comprising a connection pipe connected to said fixing member and said combustion apparatus, a part of said exhaust tube on a side of said one end portion being inserted into said connection pipe, wherein
 said second region is provided between the outer circumferential surface of said exhaust tube and an inner circumferential surface of said connection pipe,   said combustion apparatus includes a housing having an internal space, and   said housing has a connection hole that allows communication between said internal space and said second region.   
     
     
         5 . The exhaust structure for combustion apparatus according to  claim 1 , wherein said combustion apparatus is a water heater adapted to an exhaust suction and combustion system.