US1688864A - And arnold francis van pelt - Google Patents

Description

Oct. 23, 1928.

F. FISCHER ET AL ELECTRICAL SPARK IGNITION MEANS FOR BURNERS Filed July 8. 1927 Patented Oct. 23, 1928.

UNITED STATES 1,688,864 PATENT OFFICE.

FRANK rrsonnn, or LARCHMONT, NEW "roan AND ARNOLD FRANCIS VAN run-or INTERLAKEN, NEW JERSEY, ASSIGNORS DELAWARE, on NEW YORK, N. Y.

TO GRANT OIL BURNER CORPORATION OF ELECTRICAL SPARK IGNITION MEANS FOR BURNERS.

Application filed m a, 1927. Serial No. 204,330.

Our invention relates to safety ignition means for oil burners similar to the arrangement disclosed in our co-pending application Serial No. 120,855, and pertains particularly to an improvement in the circuitwhereby an electrical spark of suitable intensity must be present in order to permit operation of the burner.

lhis circuit embodies a relay in series with one of the coils of the ignition spark transformer, whereby an open circuit or even an insuificient flow of current in either the primary or secondary circuit will prevent opera tion of the burner. It also embodies means whereby a short circuit or partial short circuit of the spark gap will prevent operation of the burner.

One of the objects of our invention is to provide a combination of apparatus requiring less minute adjustment than the arrangements illustrated in our co-pending application. I

Other objects will hereinafter appear.

The nature and scope of our invention are more thoroughly explained in the following description taken in connection with the accompanying drawings forming part of this specification, in which:

Fig. l is a diagram of our spark control circuit in which a relay is placed in'series with the primary of the ignition transformer, and a second transformer and relay are actuated by thesecondary circuit of the ignition "transformer. v

Fig. 11 is a similar circuit with the first relay in series with the secondary of the ignition transformer.

Similar numerals refer to similar parts in all of the figures in which:

1 and 2 are alternating current power leads, 3\ is a motor,-4 and 5 are electrodes separated by spark-gap'6. 7 is a wire connecting one sidev of ignition transformer primary coil 9 to'1ead 1 when switch 10 is closed. 8 in Fig.

1' 1,. connects the other side of primary coil 9 in series with relay coil-22 which is in turn connected to lead 2.1 Switch 10 represents "either a manually operated switch or any type of thermostat or automatic switch for closing,

and opening thecircuit. g g In the arrangements shown, the air and oil pump 16pis' driven by motor 3 and discharges a combustible mixture .of oil'and air through conduit 17 and nozzle .18 into the firebox of the furnace. v i

The ignition transformer secondary coil 11 is connected by means of wires 12 and 13 to said electrodes 4: and 5. 14 and 15 are wires! connecting the primary 25 of a second transformer in parallel with the secondary 11 of the ignition transformer. The secondary 26 of the second transformer is connected in parallel with relay coil 19. 20 is the armature actuated by relay- coil 19, and 21 is the point with which 20 contacts to connect one side of motor 3 with the armature 23 of relay coil 22; Armature 23 inturnconnects with contact point 24 which is in turn connected with power-lead 2.

In Fig. ll relay coil 22 is connected in series with secondary coil 11 of the ignition transformer.

The operation of our electrical ignition circuit'is as follows:

The power current is always presumed to be on leads 1 and 2.

When the control switch 10 is closed (see Fig. l) relay coil 22 and primary coil 9 of the ignition transformer are energized This latter energize'sthe high-tension secondary coil 11 producing a voltage of say 10,000 volts which normally causes a spark to jump across the3i spark-gap 6 between the electrodes d an 5.

When the proper spark is passing between v thus energized. Relay coil 22, being energized by thefiow of current through the primary 9 of the ignition transformer, raises armature 23 to contact with point 24.

Since the switch mechanisms of both relays are in series with motor 3, the latter is con nected across the main power leads 1 and 2 only when both relays are simultaneously energ1zed.

If electrodes): and 5 should be ulled apart so that. a s 'table current .coul not jump acrossgap 6, heamount of current passing I throu hthe coils 11 and 9 of the ignition I trans ormer would bereduced to such an extent that relay magnet 22 would. droparma- I nition transformer constitutes an important.

ture 23 and thereby break the circuit to motor 3.1

If on the other hand, carbon should build up on electrodes 4 and 5 and the secondary circuit thereby, or for any other reason, should become partially or wholly short-circuited, then the amount of current flowing through the primary coil 25, would be reduced, secondary coil 26. would receive less energy, and consequently relay coil 19 would release armature 20 and thereby break the motor circuit at point 21. Thus, relay coil 19 will open the motor circuit in case of a. short in the ignition circuit, and relay coil 22 will break the motor circuit if the ignition circuit is open.

In the arrangement shown in Fig. II, where relay coil 22 is connected in series with the secondary instead of with the primary of the ignition transformer, the operation is identical with that described for Fig. 1, since lack of current flow in the ignition circuit will obviously cause relay coil 22 to release the armature 23 and thereby break the motor circuit; The arrangement of a special relay in series with the primary or the secondary of the-igfeature of our invention. V Transformer coils 25 and 26, and relay 19 constitute only one of the means we have in mind for preventing operation'of-the motor when an insufficient spark is produced across electrodes 5 and 6. For instance, a vacuum or gas-filled tube can be connected suitably to operate from the potential existing across the gap, and when thus energized can be made to serve relay 19 the same' as is ew done by transformer coils 25 and 26; or the tube can be made to act as a relay to replace relay 19.

Having described our invention, what we claim and [desire to secure by Letters Patent 1. In a burner ignition control device, a power circuit, atransformer having its primary connected to the power circu1t, a pair of spaced electrodes forming a. sparkgap'for' igniting the burner, said electrodes being connected to the secondary ofjthe transformer,

a relay switch having its coil inseries with the transformer for opening the power circuit when the electrode circuit is .too widely opened,-a second transformer with one 0011 shunted across the electrodes and means controlled by said seoond transformer for open- I ed around the motor an ing the power circuit when the electrodes are er, a second transformer having one coil in parallel with the electrodes so as to be energized when a spark is present at the gap and de-ener ized when the electrodes are shortcircuite and means actuated by the second transformer for openin the power circuit when the electrodes are s ort-c-ircuited.

3. In an electrical circuit for burners, a power circuit, a fuel-supply motor, a relay switch having a coil and contactors, the motor and contactors bein in series in the power circuit, a transformer Iiavin it; primary shuntcontactors, a pair of spaced electrodes forming a spark-ga said electrodes being connected to the secon ary circuit of the transformer, the coil of the switch being in series with the transformer so as to 0 en the contactors when the pre determine minimum current flows through the secondary circuit, a second transformer having 1118' primary shunted across the electrodes and a relay switch having its contactors in-series in the power circuit and having its coil connected to the secondary of the I parallel with the electrodes and its secondary connected to the second coil so as to de-energize the second coils when the. electrodes are short circuited."

FRANK FISCHER.

second transformer so as to open said contactor's when the second transformer is de- I ARNOLD FRANCIS VAN BELT.

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