Patent ID: 7765992

Claim:
A backfire suppressive configuration comprising: a first conduit which defines a mixing chamber configured to effect mixture of air and a gaseous fuel to be supplied for combustion, the first conduit being made at least in part of a metal having a thermal conductivity at least as high as that of one of steel and copper; a second conduit configured to guide air into the mixing chamber, the second conduit being made at least in part of a metal having a thermal conductivity as high as that of the first conduit and being in thermal connection with the first conduit such that the second conduit, cooled by the air flowing therethrough, dissipates heat transferred from the first conduit; at least one third conduit configured to guide the gaseous fuel into the mixing chamber, the at least one third conduit being made at least in part of a metal having a thermal conductivity as high as that of the first conduit and being in thermal connection with the first conduit such that the at least one third conduit, cooled by the gaseous fuel flowing therethrough, dissipates heat transferred from the first conduit; and at least one backfire suppressing device placed on at least a downstream side in the mixing chamber adjacent a junction of the second conduit and the at least one third conduit with the mixing chamber, the at least one backfire suppressing device being configured to promote mixture of the air and the gaseous fuel in the mixing chamber, the at least one backfire suppressing device being in thermal connection with the first conduit and made at least in part of a metal having a thermal conductivity sufficiently high to work in combination with the thermally connected first, second and third conduits to dissipate heat away from a backfire from the combustion and extinguish the backfire.