US2285326A

US2285326A - Safety pilot

Info

Publication number: US2285326A
Application number: US295880A
Authority: US
Inventors: Jr George C Bergtholdt
Original assignee: WEBSTER ENGINEERING Co
Current assignee: WEBSTER ENGINEERING Co
Priority date: 1939-09-21
Filing date: 1939-09-21
Publication date: 1942-06-02
Anticipated expiration: 1959-06-02

Description

Patented JunerZ, 1942 George C. Bergtholdt, Jr., Tulsa, Okla., assignor to Webster Engineering Company, Tulsa, Okla., c a corporation of Delaware Y A Appli-marien september 2r, 1939, serial No. 29aml 1 claim. (C1. 15s-117.1)

Burner control systemswhich depend on the of a pilot burner are well known in the art. In

this connection see patent to Knowles 1,809,280.Y However, heretofore the application of such' aV control system to burners already installed and more particularly to burners that are installed in the wall of a furnace rebox, such as a steam boiler firebox, has not been an easyA matter, and in any event has been a time consuming operation. The present inventiontherefore has for its object to provide a unit which shall makevit a relatively simple matter to install-a control system for burnersalready in place.

In the accompanying drawing wherein` the preferred form of the invention is shown,-

Fig. 1 showshow the unit Vof the present inventicn will ordinarily be installed in a furnace wall having a main burner positioned in said wall, the unit being shown in side elevation and passage of an electric current through the flame i Y through an opening in the end wall 23 thereof from a source of supply of combustible mixture. The tube is lsecured to theY Wall 23 by a screw 24 which extends through a securing lug 25 carried by the tube. A spacer bracket 26 on the tube adjacent the other end of the casing 20` serves to hold the pilot burner and tube against Vlateral displacement. The end wall 23 is detachably secured to the end of the casing by screws 21 and 28. A sight glass 29` carried by said end'wall is adapted to be moved to one side to permit the insertion of a torch into the casing for initially lighting the pilot burner. A slidable damper 30 on top of thecasing admits sec- Y ondary air to the pilot burner.

The means for shutting off the supply of fuel Y to the burner block I0 comprises anfL-shape curparts of the main burner and furnace wall being shown in vertical section; p

Fig. 2 is a plan view of the unit itself withV parts broken away andn section to more clearly show the relationship of the parts;

Fig. 3 is an end elevation on line'3-3 of Fig. l, and I I. Fig. 4 is an end elevation on line 4 4 'of Fig. 2 with parts in section.

In the drawing, there is shown a burner positioned in the wall H of a steam boiler rebox Whose'floor is indicated at I2. 'I'he burner may TIO be of preferred type and is here shown as comf prising a block .I0 `having rows cfring ports I3 to which fuel gas is delivered by gas nozzles I4 which extend from a manifold I5 at the endof a fuel supply pipe I3 -provid'edwith a gas Valve I'I, adapted to be operated by an electric motor I 3. dicated at I9.

The unit of the present invention comprises a ducttype casingZadapted to extend into the furnace wall I I to apointbelow the burner block IIJ as clearly shown in Fig. l. In the case of an already installed burner the installation of the casing is readily accomplished by removing bricks from the wall II. In installing the Acasing it is preferred to place a brick barrier 20' a short distance in advance of therebox end of the casing to shield it and the parts therein from radiant heatfrom the firebox, it being noted that said end is not closed.

` The pilot burner for lighting the main burner I0 is indicated at ZI and is supported by a gas supply tube 22 which extends into the casing The usual air control mechanism is in-V rent-conducting member whose short leg or arm is indicated at 3l and whose' long leg or arm is indicated at 32. The long leg-32 extendsrfrom and is supported by a head 33 which is detachably secured to the end wall 23 of the'casing 20 by means here shown as including a bracket 3l! adapted to be secured to said Wallby the wall securing screws 28 and the short leg 3l extends upwardly at an'angle into the path of flame from! L the pilot burner 2l. rIfhe primary purpose of detachably securing the head 33 to said end wall is to permit thesaid L-shape member to be withdrawn from the casing for inspection and repairs and, of course, also to facilitate its installation after the pilot burner is in place. To remove the L-shape member from the casing 2B after the head 33 hasbeen released from the end wall 23 it is merely necessary to pull the head awayV from said wall sufficiently far to permit the short arm 3| to clear the pilot burner and then to turn the-head to dispose said short arm 3I in prone position after which it may be readily drawn through the casing as will now be readily understood. In this connections note that the :pilot burner vis positioned far enoughY in advVance of the burner block Ill to providel a clearance space which permits the arm 3l to be turned to prone position as said. As shown in Fig. 2 the arm 3l preferably comprises an angled rod which is screwed into the end of the long` leg 32 thereby making it a simple matter to replace the flamerodSIas conditions require.

The Helectrical means which cooperates with thersaid L-shape current-conducting member to shut off the, supply of fuel to the burner block I0 incase the pilot flame goes out is diagrammatically indicated at 35.

What I claim is:

In combination, an upright furnace wall, a burner comprising a ported block positioned in said wall to re into said furnace, a relatively long wide duct positioned in said wall at one side of said burner with the forward end of the duct positioned under said block, a gas burning pilot for igniting the fuel issuing from said block and positioned in advance of the forward end of said duct and being passable through the duct, and means for shutting off the supply of fuel to the burnerin case the pilot is ineffective to ignite the fuel issuing from said block, said shut-off means comprising an L-shape current conductlng member whose short arm is normally positioned in advance of the front end of said duct to extend upwardly at an angle across the path of flame from said pilot and whose long arm extends rearwardly into said duct, said member as a whole being passable rearwardly through the duct when the short arm thereof is horizonl0 tally disposed.

GEORGE C. BERGTHOLDT, JR.