# US 10,371,375 B2 · Exhaust structure for combustion apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,371,375 B2 - Document ID: US10371375B2 - Status: Granted - Kind: B2 - Application number: 14/799,267 - Filed: 2015-07-14 - Published: 2016-01-28 - Granted: 2019-08-06 - Earliest claimed: 2014-07-25 - Assignees: Noritz Corporation - Applicants: Noritz Corporation - Inventors: Hideki Yamaguchi; Hidefumi Koda - Web page: https://patentgrep.com/patent/US10371375B2 ## CPC - F23J 13/04: Joints; Connections - F23J 11/00: Devices for conducting smoke or fumes, e.g. flues (chimney stacks E04H12/28; removing cooking fumes from domestic stoves or ranges F24C15/20 {; fume conduits of furnaces, kilns, ovens, or retorts F27D17/302}) - F23J: REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES (combustion apparatus for consuming smoke or fumes, e.g. exhaust gases, F23G7/06) ## Abstract An exhaust structure for combustion apparatus includes a combustion apparatus having a combustor unit, a blower unit and a housing, an exhaust tube connected to the combustion apparatus at one end, an exhaust pipe configured to allow a part of the exhaust pipe to be introduced therein from the other end, an exhaust adapter disposed between an inner circumferential surface of the exhaust pipe and an outer circumferential surface of the exhaust tube, a connection pipe configured to communicate a region between the inner circumferential surface of the exhaust pipe and the outer circumferential surface of the exhaust tube to an inner space of the combustion apparatus, and an exhaust member connected between the combustion apparatus and the one end of the exhaust tube. The housing of the combustion apparatus is provided with a connection member for connecting the connection pipe. ## Claims ### Claim 1 An exhaust structure for combustion apparatus, comprising: a combustion apparatus including a combustor unit configured to produce combustion gas, a blower unit configured to supply air for combustion to said combustor unit, and a housing configured to house therein said combustor unit and said blower unit; \ an exhaust tube having one end and the other end, and connected to said combustion apparatus at the one end; an exhaust pipe configured to allow a part of said exhaust tube to be introduced therein from the other end; an exhaust adapter having an annular shape surrounding a through hole, attached to an outer circumferential surface of said exhaust tube by fitting said exhaust tube into said through hole, and attached to an inner circumferential surface of said exhaust pipe; a connection pipe configured to communicate a region between the outer circumferential surface of said exhaust tube and the inner circumferential surface of said exhaust pipe to an inner space of said combustion apparatus; and an exhaust member connected between said combustion apparatus and said one end of said exhaust tube, wherein said housing of said combustion apparatus is provided with a connection member for connecting said connection pipe, said region located between said outer circumferential surface of said exhaust tube and said inner circumferential surface of said exhaust pipe is positioned closer to said combustion apparatus than to said exhaust adapter, said region located between said outer circumferential surface of said exhaust tube and said inner circumferential surface of said exhaust pipe is fluidly isolated from a region within the exhaust tube and the outdoors, said connection pipe is formed of a different member from said exhaust tube and said exhaust pipe, and in the event there is a leak in the exhaust tube, exhaust gas in said region between said outer circumferential surface of said exhaust tube and said inner circumferential surface of said exhaust pipe is guided into an inner space of said housing via said connection pipe. ### Claim 2 (depends on 1) The exhaust structure for combustion apparatus according to claim 1, wherein said connection pipe is configured to allow a part of said exhaust tube to be introduced therein from said one end, said connection member is disposed so as to surround said exhaust member. ### Claim 3 (depends on 1) The exhaust structure for combustion apparatus according to claim 1, wherein said connection pipe is flexible. ### Claim 4 (depends on 1) The exhaust structure for combustion apparatus according to claim 1, further comprising a fixing member configured to fix said exhaust pipe and said exhaust tube to each other, wherein said fixing member is connected by said connection pipe, and is provided with a communication hole configured to communicate said region between the outer circumferential surface of said exhaust tube and the inner circumferential surface of said exhaust pipe to an inner space of said connection pipe. ### Claim 5 (depends on 1) The exhaust structure for combustion apparatus according to claim 1, wherein said combustion apparatus is a water heater of an exhaust suction and combustion type. ### Claim 6 (depends on 2) The exhaust structure for combustion apparatus according to claim 2, wherein said connection pipe is flexible. ### Claim 7 (depends on 2) The exhaust structure for combustion apparatus according to claim 2, further comprising a fixing member configured to fix said exhaust pipe and said exhaust tube to each other, wherein said fixing member is connected by said connection pipe, and is provided with a communication hole configured to communicate said region between the outer circumferential surface of said exhaust tube and the inner circumferential surface of said exhaust pipe to an inner space of said connection pipe. ### Claim 8 (depends on 2) The exhaust structure for combustion apparatus according to claim 2, wherein said combustion apparatus is a water heater of an exhaust suction and combustion type. ### Claim 9 (depends on 3) The exhaust structure for combustion apparatus according to claim 3, further comprising a fixing member configured to fix said exhaust pipe and said exhaust tube to each other, wherein said fixing member is connected by said connection pipe, and is provided with a communication hole configured to communicate said region between the outer circumferential surface of said exhaust tube and the inner circumferential surface of said exhaust pipe to an inner space of said connection pipe. ### Claim 10 (depends on 3) The exhaust structure for combustion apparatus according to claim 3, wherein said combustion apparatus is a water heater of an exhaust suction and combustion type. ### Claim 11 (depends on 4) The exhaust structure for combustion apparatus according to claim 4, wherein said combustion apparatus is a water heater of an exhaust suction and combustion type.