US1783676A

US1783676A - Pilot for furnaces

Info

Publication number: US1783676A
Application number: US378320A
Authority: US
Inventors: Otto H Rodenberg
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-07-15
Filing date: 1929-07-15
Publication date: 1930-12-02
Anticipated expiration: 1947-12-02

Description

Dec. 2, 1930.

O. H. RODENBERG PILOT FOR FURNACES Filed July 15, L929 I l l huun I l I I II x.

I N VEN TOR.

A TTORNEYS Patented Dec. 2, 1930 PATENT? OFFICE} I l o'r'ro n. 'RODENBERG, F cmo nivnrr, oHIo rrnozr roR summons n pncationn a July 15,1929; serial no. 378,326; r g

' My invention relates to pilots for gas fired furnaces and oil burning furnaces, and particularly to'gas pilots provided with an automatic control for'governing the operation of the pilot.

In theart the use of pilots disclosing the general combination of elements involved'in the particular type of pilot topwhich my invention relates 'has been quite extensively de-" veloped." The construction of such pilots is broadly as follows There is an outer "shell within which' an expansion tube is mounted.

The expansion tube is secured to' the outer shell adjacent the end of the shell at afiposition in which aibran'ch extends at an. angleto' the tube and from the end of the branch pipefthe gas flows in a stream to cause the ignition of the gas or oil in'the main burners in the furnace. There are a series of small orifices in the tube. in an exposed portion thereof adjacent the branch discharge pipe and a series of jets of gts burning from these orifices causes the tube to expand and, being fixed at one end, the tubeexpands through the outerend of the shell where it controls an electric switch which inturn' governs a gas supply valve.

In pilots of the type described, if the branch pipe through which the pilot flame burns is at the end of the expansion tube there is some likelihood of the pilot flame becoming extinguished due to soot forming in the pipe, and there is thus considerable danger of explosion. It is the object of my 135 discharge pipe that the danger ofclogging up and thus causing the pilot flame to become extinguished will beminimized.

i he above and other objects to which ref: erence will be made in the ensuing disclosure I accomplish by that certain combination and arrangement of parts of which I have shown a preferred embodiment. 7 Referring to the drawings Figure 1 is a plan View of the preferred type of pilot. I Figure 2 is a side elevation of the plot.

-Within the shell 1, having a cut-away portion 2 at the end thereof, whichextends into the furnace, there is'a tubular expansion pipe invention therefore to so construct the branch possibilityofthe pilot 7 j tinguished,and whi'le broadly the idea of-the thermostatic control is old, itis my thought i that' I'ThaVeQadided*thereto asafety feature whichiwillfgreatlypromote the use of this 7 I 3 secured to the shell as indicatedjat 4. l The tube is thus fixed at its outjerend'. The inner end passes through the open end of the shell and hasa slot 5' therein into which'the gas to be supplied flows from an orifice 6 in the 1 gas supply pipe 7.--'The tube has a piston 8 securedto its end which operates a switch 9 and thus, through an electric control valve (not shown), the flow of gasto the pilot is governed. Extending at substantiallya right angle from the end of the tube'thereis a branch pipe 10' through which gas may pass to the end ll of the branch thus causing the pilot flame. In'addition to the main branch pipe '65 C' 10 there is a supplemental gaspipe 12 extending from a'positio'nin-the gas expansion tube towardthe inner of a row of expansion tubeflame orifices l3'and joiningthe pipe 10 at 12a! The pipe'12 is provided with a slot '7 14 which extendsfrorn the' endof the *di's' charge opening-I1 along the side ofthepipe 12 until it bisectsthe tube 3 at l5 interme J diatethe row of expansion tube orifices 13. f

' The operation of the pilot as follows} :2 ,The shell ektends horizontally into the furnacei From the orifices 13 a series of small jets offfia'me cause the expansion tubefto heat up and expand causing the operation of;

Gas will flow out theelectricfswitch' 9." V v through the slot 14 as soon as there is enough to more than supply gas forthe orifices 13 and'the pilot fiame issuing from the. end ll 'of the tubefwilbalways beignited due to thecontinuous; flame. extending along the! 85.1

slot 14., i The gas fiojwing 'from the slot 14 will alwaystbe ignited due to the qopening. v '15 which willgalways be ignited by the flames issuing-r froinflthe orifices}. 13.1 Shouldgthef pipe ,10 become blocked up due toi-jsootthere; I

supplemental pipe 12.

willfalways be ia free fiow- 'o f gas through the Thusl provide a pilot minimizes the flamebecomiiig 'QXI- ample of my invention, I include therein such changes in the positioning of the main and supplemental branch pipes as will occur to one skilled in the art and I consider such mechanical modifications within the scope of my invention.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is V 1. A gas pilot comprising a shell having an expansion tube mounted within the shell and having an end of the tube fixed to a cutaway portion of the shell, said tube having a series of orifices extending along the tube in an exposed portion of the upper surface of the tube adjacent the end thereof, a branch pipe extending at an angle from the fixed end of the tube, and a supplemental pipe extending across from the tube adjacent the orifices therein to said branch pipe.

2. A gas pilot comprising a shell having an expansion tube mounted within the shell and having an end of the tube fixed to a cutaway portion of the shell, said tube having a series of orifices extending along the tube in an exposed portion of the upper surface of, the tube adjacent the end thereof, a branch pipe extending at an angle from the fixed end of the tube, and a supplemental pipe extending across from the tube adjacent the orifices therein to said branch pipe, said tube having a slot extending through the side thereof.

3. A gas pilot comprising a shell having an expansion tube mounted Within the shell and having an end of the tube fixed to a cutaway portion of the shell, said tube having a series of orifices extending along the tube in an exposed portion of the upper surface of the tube adjacent the end thereof, a branch pipe extending at an angle from the fixed end of the tube, and a supplemental pipe extending across from the tube adjacent the orifices therein to said branch pipe, said tube having a slot extending through the side thereof, and said slot bisecting the. upper surface of the tube.

4. In a device of the character specified, a shell containing a thermostatic expansion tube through which gas flows to a pilot discharge, a branch pipe extending from a fixed end of the tube at an angle to thetube, the end of said pipe comprising a discharge for the pilot flame, and an auxiliary pipe extending from the tube across to said branch pipe.

5. In a device of the character specified, a shell containinga thermostatic expansion tube through which gas flows to a pilot discharge, a branch pipe extending from a fixed end of the tube at an angle to the tube, the end of said pipe comprising'a discharge for the pilot flame, and an auxiliary pipe extending from the tube across to said branch pipe, said auxiliary pipe having orifices extending through the side wall thereof, for the purposes described.

6. In combination in a gas pilot, a shell having an expansion tube therein provided with a series of orifices extending along the tube adjacent the end thereof, a discharge port for the pilot flame, and a branch pipe leading from the tube intermediate the orifices to said discharge port.

7. In combination in a gas pilot, a shell having an expansion tube therein provided with a series of orifices extending along the tube adjacent the end thereof, a discharge port for the pilot flame, and a branch pipe leading from the tube intermediate the orifices to said discharge port, said branch pipe having discharging means extending from a side wall whereby a feeding flame from the orifices to the discharge port is provided.

8. In combination in a gas pilot, a shell having an expansion tube therein provided with a series of orifices extending along the tube adjacent the end thereof, a discharge port for the pilot flame, and a branch. pipe leading from the tube intermediate the orifices to said discharge port, said branch pipe having discharging means extending from a side wall whereby a feeding flame from the orifices to the discharge port is provided, said discharging means arranged at such a level in said pipe as to receive a supply of gas not consumed in said orifices.

OTTO H. RODENBERG.