Patent ID: 6443728
Filing Date: 2002-09-03
Classification: F23D,F23Q

Abstract:
A gas pipe ignitor for igniting a non-premixed air and fuel mixture, comprising:an air supply conduit having an axis along its length, a supply end, and a flame end axially spaced from the supply end; a fuel supply conduit extending axially interiorly within at least a portion of the air supply conduit, the fuel supply conduit having an entrance end and an exit end disposed downstream of the supply end of the air supply conduit, as viewed relative to the direction of flow of air in the air supply conduit; a deflector body disposed in the air supply conduit at a location therein intermediate the entrance end and the exit end of the fuel supply conduit and the deflector body having an overall radial extent perpendicular to the axis of the air supply conduit which is greater than the overall radial extent of the fuel supply conduit such that the fuel supply conduit passes axially through the deflector body, the deflector body having an upstream face and a downstream face, as viewed relative to the direction of flow of air through the air supply conduit, and the deflector body being configured relative to the air supply conduit such that air flowing in the air supply conduit flows along a pass through passage extending between the upstream and downstream faces of the deflector body and the deflector body having a geometry to reduce the radial cross section of the air in the air supply passage to its minimum value at the pass through passage; at least one branch passage formed as a bore in the deflector body and extending at an angle from the axis of the air supply conduit, the at least one branch passage having an inlet end communicated with the portion of the fuel supply conduit within the deflector body and an outlet end radially spaced from and upstream of the exit end of the fuel supply conduit such that some fuel in the fuel supply conduit diverts from the balance of the fuel and flows instead through the one branch passage with such diverted fuel not being in contact with air supplied through the air supply conduit until the fuel exits the branch passage through its outlet end into contact with air in the air supply conduit which has passed through the pass through passage; and an ignition element for promoting the ignition of the fuel which has exited the at least one branch passage, the ignition element extending from an end upstream of the deflector body to another end which is downstream of the at least one branch passage outlet end and upstream of the exit end of the fuel supply conduit.