US1629251A - Of astlebobo - Google Patents

Description

Ma I 1927.

y 7' H. s. BLAKE GAS coNTRoL FOR OIL BURNERSl Filed Aug. 4,' 1926 2 Sheets-.Sheet l A TTORNEYS.

,62 9,251 May 17' 1927' H. s. BLAKE GAS CONTRL FOR OIL BURNERS Filed Aug. 4, 1926 2 Sheets-Sheet 2 I N VEN TOR.

A TTORNEYS.

Patented May 17, E927.

HABOLD S. BLAKE; OF ATTLEBOBO, HASSACHU SETTS.

GAS CONTROL FOR OIL BUR- apncafion med august 4, 1928. serial :ta-187,047.

This invention relates to improvements in liquid-fuel burning appara'tus of the on-andoff type; and has for its object to provide in' such an apparatus means for electrically controlling the flow of gas to the pilotlight, whereby when a mixture of air and oil are forced into the furnace after a rest period the 'flow of gas to the pilot light is Simultaneously and automatically increased in volume and for a sufficient period to fully ignite the fuel mixture after which this large flow is reduced to theminimum or suflicient to just feed a small jet, where it rerains during the remainder of that heating period and until again called upon to ignite another initial charge after the apparatus has had. another rest period. j

A further object of the inventionis the provision of electromagnetic means in the electric circuit, which is deenergized at the time the power is shut off to arrest the air blower and the flow of oil, which deenergizing action serves to close one valve in the main gas supply and open another 'valve therein,`and when the heating -apparatus is Aagain started after a period of rest, this electromagnet is energized to promptly open the closed valve and effect a delayed closing of the open valve during'which interval of delay a full charge of 'gas is supplied' to the pilot sufficient to fully ignite theinitial charge of fuel being forced) into the furnace, a bypass or auxiliary supply pipe being provided for continuing a suflicient 'supply' to the jet to prevent it from being completely extinguished. The invention further consists in the provision of. electromagnet means for opening and closing the oil supply control valve simultaneously with the starting of the blower when the circuit is again closed.

VVitli these and other objectsin view, the invention consists of certain novel features of construction, as will be more` fully described, and particularly pointed out in the appended claims.

In the accompanying drawings:

Figure 1 is a side elevation illustrating the general arrangement of my improved heating apparatus and showing one arran'gement of supply' pipes for the air,`oil and as. g Figure 2 is a perspective view illustrating the electromagnetic means for controlling the flow of the gas and the oil. i

Figure 3 is a sectional elevation illustrating the resistance unit which causes a delayed closing of one of the gas valves.

'Figure 4; is a sectional elevation showing the electromagnet for controlling the action of the oil supply valve. i lFigure 5 is a dia ammatic'view illustratmg the general wiring diagram ylcy which the different units are connected in the circuit to operate when the circuit is opened and closed. i

Figure 6 is a sectional view showing the two) control valves 'in the main gas supply, one being shown as open and the otherV closed. t

It is found in. the-practical operation of liquid fuel burning apparatus of the alternate off and on" type for heating-systems as applied to furnaces where a pressure of air is mixed with oil' and the Amixtilre forced into a furnace for .a heating. period and then shut off for a rest period, of advantage to provide a gas flame of suflicient volume to quickly ignite this fuel mixture at the time it is initially forced into the furnace 90 after eachperiod of rest/and to provide a pilot light of suflicie'nt volume to ignite this mixture without being extinguished; also after the mixture has been properly ignited to then reduce the flow of the gas to the pilot light to the very minimum permitting .the pilot jet to remain lighted, whereby it is maintainedready to be 'again increased to ignite the next fuel mixture after'a rest period; and in order to provide simple and effective means for so controlling this gas flow, I have provided a main and an' auxiliary gas supply pipe, the auxilia'ry pipe being for the purpose of continuously supplying the pilot with the minimum amount of gas, when the main is shut off, the main pipe being for the purpose of permitting a large volume of flow for a limited peiod during the initial igniting of the charge of fresh fuel. ln this main line, I have* mounted av pair of valves both of which are connected to an electromagnet, whereby when the magnet is deenergized the fall of the inagnet core by gravity will close one of the valves by completin the circuit, it will first act upon the close valve to open it and also acts upon the open valve to effect a delaye'd closing thereof, wherebv for a short period a large volume. of gas is permittedto flow to the pilot to well ig'nite the fresh 110 charge of fuel, after which the closing of the last valve shuts off the supply through the main, permitting the small supply through the bypass or auxilia'ryv pipe to supply the gas pilot jet by which arrangement of apparatus the larger Volume of gas is used only for a very shorttime to' reduce the Operatingv expense;' and the/ following 1s a fi detailed description of the present' embodiment of my invention and showing one means by which these advantageous results may be accomplishedz- With reference to the drawings, desigvnates the deflector member located in ith'e 'furnace 11, and 12 designates the air supply 'through the tube' 12 to the discharge end thereof to mi-x with the airV flowing from this tube and be forced against the deflecting member 10 in ,the furnace. The gasv for supplying the pilot light which initially ignites this fuel mixture enters from any convenient source through ha 'pipe and main pipe 21, which latter pipe is provided with a" pair of valves 22 and 23, and a bypass or auxiliary pipe 24 is also provided 1n which .is located a manually operable control va1ve"25 to continuously supply a small quantity of gas to the pilot jet 26. t

It is found in practice of advantage to initially inject a 'comparatively large jet or flameinto the fuel mixture27 of air and oil as it is forced from the end '13' of the tube 12 after each rest period.

In order to control the period of increased gas flow, I have mounted an electromagnetl 28 in the electric circuit 29, see Figure 5. The core 30 ofthis elect-romagnet is connected to the valve 22 through the armv 33, rod 34 and valve vlever 35 and this electromagnet is operativel'y connected to the valve 23 through the resistance unit 36 which eom-` prises-a Chamber 37 filled with glycerine and' in this chamber is mounted a disc 38 which' rests upon its seat 39, the disc being provided with av stem 40 extending out through the end' 41-of the chamber, and it is connected to the s'ol'enoid core 30 by a spring 42, also this solenoid 'core is provided with a -resilient arm 43 which is arranged to engage the arm 44 on the 'stem 40 so that when ,the magnet is deenergized the core will drop bg' gravit and this member 43 will act t rough t e arm 44' and connecting rod 45 upon the lever 46 to .move the valve 23, to openaosition, which may be effected either by a manual opening of the main switch'47 in the circuit or by actionof the'thermostat way of pipe 18 i 48 which may be set in any of the rooms to be heated, or by action of the pressurestat 48 which may be eifected by the steam pressure in the furnace, which opening of the ircuit also shut ofi' With the blower motor The electromagnetic oil control valve 17 is simultaneously deenergized to shut off the supply of oil. r When the vcircuit is now'closcd either b action of the thermostat or pressurestat, the

fan motor is started and the electromagnetic valve 17 controlling the oil supply is opened and at the same timev the electromagnet 28 is energized which serves to lift its core 30 to at once open the gas Valve 22 in the main; by this action it willbeiseen that both the lvalve 22 and the valve '23 are now open 'to permit a free flow ofa large volume of gas to the pilot suflicient to ignite the initial fuel mixture as it is forced into the furnace, which large flame is maintained for a short period, and this upward' movement of the sol'enoid core 30 also effects a deferred closing movement .to 'the' now open valve 23, whichis accomplished through the' lresistance unit 36 above described by exerting a tension on the spring 42 which serves to slowly lift this disc 38 from its seat 39 where it is held by suction after a predetermined period to break the vacuum thereunder and permitthe valve 23 to be. moved to closed position and so shut ofi' this maximu volume of gas to the pilot.

' This ,cycle of Operations is repeated each time the circuit is opened and' closed' to de- .energize and -energize the electromagnetto open and close the main gas valves; first to supply the pilot with a large flame sufiicient to ignite the fuel supply and later shut off the igniting flame until again called upon 'to initially ignite another charge after each rest period. i

The .foregoing description is directed ,solely towards the construction illustrated, but I desire it to be'understood that I reserve the privilege of resorting to all the mechanical changes to which the device is susceptible, the invention being' defined and limited only by the terms of the appended claims.

I claim:

1. In a liquid fuel burner, an electric circuit, separately actuated means in the circuit'for supplying air and oil to the burner, main and auxiliary conduits for supplying gas for fuel ignition, a normally closed and a normally open valve in said main, electromagnetic means for first opening said closed valve, .and a resistance unit interposed between said open valve and said electromagnetic means for controlling a subsequent closing of this second-valve after a predetermined open period.

2. In a liquid fuel burner, an electric circuit, means in said circuit .for controlling the supply of air and oil to the burner, main and auxiliary conduits for supplying 'gas for igniting the fuel supply, apair-of valves in saidnnain, electromagnetic means .in said circuit for closing one of said valves and opening the other When deenergized, and for promptly opening the closed valve and efl'ecting a delayed closing of the open valve When' energized.

3. In a. liquid fuel burner, a blower for.

I supplying a draft of air to the burner, a

pilot jet, a gas conduit for supplying gas to the pilot, an electric circuit, a blower motor in said circuit, and means in said Circuit p operated simultaneously with the starting of' said motor for increasing the gas flow to the,

. -of time. e

5. In a liquid fuel burner, a gas pilot jet, a' conduit for supplying. gas thereto, a pair of valves in said conduit, electrically actuated means for Operating one of said valves, a spring connected to' said actuating means and to said other or second valve for operating the same, and a mechanical resistance connectedto said other or second valve for retarding the, action thereof Whereby second valve operates at a later period-'than the first valve.

Said.,

6. In a liquid fuel burner, a gas 'pilot jet a conduit for supplying-gas thereto, a pair of valves in said conduit, electrically actuated means for Operating one of said valves, a chamber, a plate in said chamber, a second plate in contact With the first plate, a piston rod carried by the second plate, liquid in said chamber about said plates, means connecting 'said piston rod and' second valve,.and a .spring connecting' said electrical'ly actuated 'means and piston rod through which'apnll is exerted on saidpiston rod, the same being retarded in its movement by means of suction between' said lates. f

7. In a liquld` fuel burner, a gas-pilot jet,

a gas conduit connected thereto, an oil jet,

an oil conduit thereto, a valve in the conduit, a. blower, an electric circuit, electrically operated means for starting said blower and opening the oil valve and meansfsimultaneously operated by said electrical circuit for increasing the gas pilot flow upon the starting of the blower and rmeans mechanically connected to the gas' pilot increasing means and directly actuated thereby for. shutting down the gas pilotiflow at the end of a pre-l determined period of time.

8. In a' liquid fuel burner, a gas pilot jet,

a conduit for supplying gas'there'to, a; pair of valves in said conduit, .one :open and the other closedwhen the burneris inoperative, means for opening the closed valve, means mechanically directly connected to said valve opening means and actuated thereby for closing the other or open valve at the vend of a predetermined length' of time, 'and a .bypass conduit leading around said valves by which a predetermined minimum quantity ofgasv mtylcontinuously flow to said pilot jet.

HARQLD s. BLAKE.

*testimony Rwh'ereof I aflix my signature.

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