Disclosed are a flue pipe separation sensing apparatus and a boiler including the same. The flue pipe separation sensing apparatus of a boiler for sensing separation of an exhaust flue pipe that is fitted with and coupled to an exhaust adapter provided in an exhaust opening of a boiler body includes a sensing member located on an outer side of the exhaust flue pipe in a state, in which the exhaust flue pipe is coupled to the exhaust adapter, and that passes through the exhaust adapter by an elastic force and proceed into an interior of the exhaust adapter to sense the separation of the exhaust flue pipe when the exhaust flue pipe is separated from the exhaust adapter.

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.

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.

An exhaust pipe holding member includes an annular portion, an annular outward protruding portion (protruding piece), and a flange portion. The annular portion is formed with a through hole penetrating from one end through the other end. The outward protruding portion protrudes peripherally outward from the outer peripheral surface of the annular portion. The flange portion is disposed closer to one end than to the outward protruding portion, extending peripherally outward from the outer peripheral surface of the annular portion, and is configured to have a thickness greater than that of the outward protruding portion. The flange portion is formed with an annular groove surrounding the through hole.

An exhaust pipe holding member includes an annular portion, an annular outward protruding portion (protruding piece), and a flange portion. The annular portion is formed with a through hole penetrating from one end through the other end. The outward protruding portion protrudes peripherally outward from the outer peripheral surface of the annular portion. The flange portion is disposed closer to one end than to the outward protruding portion, extending peripherally outward from the outer peripheral surface of the annular portion, and is configured to have a thickness greater than that of the outward protruding portion. The flange portion is formed with an annular groove surrounding the through hole.

A joint seal system and method may include a seal and a band. The seal may be positioned between abutting flanges of two adjacent duct sections. A band may be positioned over the two flanges and the flange interface. The joint seal system and method may be configured to mitigate and/or eliminate leakage of pressure, flue gases, condensate, and/or any other fluid, gas, and/or vapor between abutting flanges of duct sections at a flange interface.

A joint seal system and method may include a seal and a band. The seal may be positioned between abutting flanges of two adjacent duct sections. A band may be positioned over the two flanges and the flange interface. The joint seal system and method may be configured to mitigate and/or eliminate leakage of pressure, flue gases, condensate, and/or any other fluid, gas, and/or vapor between abutting flanges of duct sections at a flange interface.

An exhaust connection structure is constructed to connect a combustion apparatus and an exhaust tube having projections and recesses in an outer surface. The exhaust connection structure has a sealing member arranged on an outer circumferential surface of the exhaust tube and an exhaust joint arranged to sandwich the sealing member between the exhaust joint and the outer circumferential surface of the exhaust tube. The exhaust joint includes an engagement member and the engagement member has an annular portion and an engaging portion bent toward an inner circumference of the annular portion. The engaging portion is engaged with the projections and recesses in the exhaust tube.

An exhaust connection structure is constructed to connect a combustion apparatus and an exhaust tube having projections and recesses in an outer surface. The exhaust connection structure has a sealing member arranged on an outer circumferential surface of the exhaust tube and an exhaust joint arranged to sandwich the sealing member between the exhaust joint and the outer circumferential surface of the exhaust tube. The exhaust joint includes an engagement member and the engagement member has an annular portion and an engaging portion bent toward an inner circumference of the annular portion. The engaging portion is engaged with the projections and recesses in the exhaust tube.

The present invention relates to a reverse flow prevention apparatus for common exhaust flue and a combustion apparatus having same. The reverse flow prevention apparatus for common exhaust flue, which is configured to collect exhaust gas of a plurality of combustion apparatuses, discharge the collected exhaust gas through a common exhaust flue, and prevent a reverse flow of the exhaust gas from the common exhaust pipe to each of the combustion apparatuses, includes a flange coupled to an exhaust port of each of the combustion apparatuses, an opening and closing apparatus hinge-coupled to an upper part of the flange to be opened and closed by a pressure difference between a lower portion and an upper portion thereof, and a body coupled to the upper part of the flange so as to accommodate the opening and closing apparatus. In accordance with the present invention, the reverse flow prevention apparatus, which may be directly installed at the exhaust port of the combustion apparatus, is coupled to the common exhaust flue upon installation thereof so that a separate certification may not be required to reduce time and costs for a certification.