US1786068A - Burner control - Google Patents

Description

Filed July 1, 924 3 Sheets-Sheet 1 WTOR.

"fi 4% ATTORNEY B. W. HURD Dec. 23, 1930.

BURNER CONTROL 3 Sheds-Sheet 2 Filed July 1, 1924 W IN V TOR. 3 1%} ATTORNEY- B. W. HURD Dec. 23, 1930.

BURNER CONTROL 5 Sheets-Sheet 5 Filed July 1, 1924 i... ,lillirii Patented Dec. 23, 1930 UNITED STATES PATENT OFFICE BENJAMIN W. HIIJ'RD, OF Sl-IN FRANCISCO, CALIFORNIA, ASSIGNOR TO TURBINE FUEL OIL BURNER (30., OF SAN rnanorscq'cmmr'omvm, A CORPORATION OF NEVADA BURNER CONTROL Application filed July 1,

The present invention relates to oil burners and more particularly to an automatic control for oil burners utilizing any type of hydrocarbon fuel.

The invention is primarily designed for the moving of the burner fromfiring position relatively to the fire-box, when shut off, protecting it from the fire-box heat when the burner is not in operation, and the moving of the burner into firing position when it is desired to operate the same. The invention also relates to the turning. on and shutting off of the oilsupply, starting and stopping of the air supplying or blowing set and controlling the operation of the pilot member for igniting the burner; the aboveand other operations being controlled by automatic means, the operation of which is regulated preferably by a thermostat of standard design. The described installation is designed so that the sameor a lower voltage current may be used for the thermostat and motor circuit and the same voltage "or other current may be used for the pump and blowing motor, each being operated in connection with, but independent of the other. I I

With the above mentioned and other objects in view, the invention consists in the novel construction and combination of parts hereinafter described, illustrated in the accompanying drawings, and set forth in the claims hereto appended, it being understood that various changes in the form, proportion, size and minor details of construction within the scope of the claims may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention. I attain theseobjects by the mechanism illustrated in the accompanying drawings wherein Fig. 1 is a view in perspective of one embodiment of an installation as seen from the front right hand side of the furnace. w

Fig. 2 is a partly broken perspective view of the operating mechanism of the main switch.

Fig. 3 is a view in partly broken elevation of the switch tripping mechanism.

Fig. 4 is a view in partly broken elevation of the repeat mechanism.

1924. Serial No. 723,532.

circuit connections with the various parts.

In the drawings wherein like characters of"- reference designate corresponding parts, 1 indicates the main operating motor and 2 a worm on the motor shaft 2' thereof. 3 represents a worm gear on one end of the transmitting shaft 3, the other end of the trans mitting shaft 3 carrying a worm 4 intermeshing with the worm gear 5 carried by one end of shaft 6 Fig. 2. The other end of shaft 6 mounts a cam 7 clearly illustrated in Fig. 2 and which cam is designed to rotate with the shaft during its operation, A roller 8 fastened to the central part of a lever 9 rests on cam 7, said lever having one end pivoted on frame 17 and the other end of the arm 9 .is pivotally secured to a connecting rod 10, the upper slotted end 10 of which receives a switch lever handle 11 mounted to operate the switch 28 for controlling the operation of the burner 35, and the mechanism not shown, which latter mechanism operates to control the air and fuel supply to the burner.

Worm gear 5 carries a crank 'pin 12 mounting one end of link 13 which connects with the arm 13 .of the segment 14, the latter being fulcrumed at 14, and engages with a pinion 15 on shaft 16, thus rotating the shaft 16 when the same operates. A frame 17 of any suitable construction serves as a support for the aforementioned parts. A pair of normally engaged spring contacts 18 .and 18' are mounted on an insulated support 18 carried bv frame 17, and another pair of normally engaged spring contacts 19 and 19-are.carried byinsulating support 19" on said frame 17.

. clockwise direction as illustrated in Fig. 1.

A link 20 connected with the segment 14 pivotally connects at its opposite end with the switch trip bell crank 21 carryin a trip finger 22 adapted to engage aswitch lding The contacts 18 and v lever 23 to trip the same enabling the release by the action of spring 24' of the switch 28 and cutting off the supply of current to the fuel pump and air blower not shown. This action of trip switch holding lever, permitting the release takes-place as the segment 14 oscillates in a clockwise direction and causes 'the rotation of the shaft 25 and pinion 26, to-

closed immediately after the burner has been i moved from withdrawn to firing position. A pair of contacts 31 and 32 are mounted on the side of box 24, contact 31 having a spring finger lying in the path of movement of the switch 28, so that should the levers 10 and 11 when operated by cam 7 fail to close switch 28 to set the pump and blowerv in operation, it will fall backward and downwardly and engage the spring finger of contact 31, move it into engagement with contact 32 to close the circuit to the motor 1 in the manner and for a purpose hereafter described.

The burner illustrated conventionally as at 35 is of the well known type and is supplied with air through a pipe 33 and with oil through a pipe 34, there being an automatic cut-01f oil joint 34 shutting off the flow of oil into the burner when the burner is rocked back into withdrawn position.

A pilot burner 36 extends into the boiler or fire-box and is preferably disposed at an angle to the burner, air being supplied thereto through a connection 36 with the air pipe 33 and agaseous fuel being supplied thereto through a pipe 38 controlled by a valve 39, the valve being provided with a handle operating sprin 39 and the handle 40 thereof-is ada ted to e engaged by the segment 27 on the urner 35 being moved to firing position to cause an opening of the valve against the spring and admitting a sup 1y of gas to the pilot burner. Thus it will lie observed that on the movement of the main hydrocarbon burner to firing position, the ilot is automatically increased to ignite t e fuel issuing from the burner and is maintained ignited to enable the gas flame issuing therefrom to intensify the flame issuing from the hydrocarbon burner.

- The room thermostat is illustrated conventionally as at 42 and from thesame extends a conduit 43 enclosing the wires extending to r the operating mechanism. To prevent undue flooding ofthe ap aratus, should for any reason the hydroca-r on burner be extinguished or not ignite when moved into firing position and the oil supply means, not shown,

continue to operate I provide -in advance of the boiler front a trough 41 having an overflowing spout 41, with which is associated a receptacle 44 carried at one end of the pivotally mounted switch lever of the overbalance type 45. The lever carries a contact 45a adapted to engage with fixed contacts 45 1n the main circuit, the same controlling the operation of the fuel supplying means (not shown). In this main circuit is also another set of contacts, not shown, in the thermostat box 47 positioned immediately below the outlet end of the pilot fuel pipe 38, thus contacts within said box are adapted to break on the temperature thereof falling below a predetermined point which will open the main circuit and render it impossible to start the motor should the pilot light be extinguished.

The parts as shown in Fig. 1 arein the position they occupy after operation of the various elements to set the burner in firing position for the heating cycle. Referring more particularly to the wiring diagram in Fig. 5, the thermostat 42, which may be of any standard construction known in the art adapted to close independent electrical circuits at two different temperatures, one a low temperature, and the other a higher tempera ture; has the low temperature contacts indicated by the numeral 50 and the high temperature contacts by the numeral 51; 52 indicating a circuit closing medium adapted to rise and fall within the thermostat according to the variation in temperature so as to close the circuits between either the contacts 50 or contacts 51. A circuit connection 53 is made with one contact of each pair 50 and 51 and one terminal of a suitable source of electric power. The other contact of the pair 50 is connected by a wire 54 with contact 18' on the frame 17. The contact- 18 has a wire connection 55 in common with the contact 19 connected to one terminal of the motor 1, while the opposite terminal of the motor is connected by wire 56 to the thermostat 47 which controls the circuit from the other side of the source of power through wire 58. In the event that the pilot burner fails to operate so as to ignite the main burner 35, the lack of heat in the thermostat 47 will permit the thermostat to operate for openin the circuit to the wire 58 and thereby stop t e operation of the entire apparatus until the pilot is lighted.

One contact of the pair 51 of thermostat 42 is connected by wire 59 to contact 19, while the contact 19 is connected to the motor 1 in the manner above described.

In the control of the operation of motor 1 by thermostat 42, the circuit closing element 52 of the thermostat will close the circuit through the pair of contacts 50 when the thermostat reaches the low temperature limit which may be any desired temperature so that it. will close the circuit to the motor 1 and secure its operation for rotating the gear 5 'until the pin 12 engages the end of contact 18. When the circuits through the pair of contacts 50 is originally closed, the pin 12 will the closing of the circuit at the contact 50 will secure an operationof motor 1 to move gear 5 a one-half revolution soas to move the part into firing position for producin the heating cycle of-the apparatus. When t e pin 12 en gages contact 18, it will separate it from contact 18' and break the circuit to the motor 1, thereby stopping the apparatus in the position shown in Pig. 1. During this cycle of movement the cam 7 will operate lever 9 and close switch 28 so as to set the motors for the air and oil supply in operation to supply required'air and oil to the burner 35. 'When all of the parts of the system properly operate, thegear 5 will remain in position to hold contacts 18 and 19 disengaged and the motor deenergized so that the heating cycle will' continue until the thermostat rises and moves the contact element 52 into engagement with the contact 51. When this occurs, the circuit through wire 59 to contacts 19 and 19 will be energized so as to complete the circuit through the motor 1 and secure another operation of gear 5 through a one-half revoluopens this circuit to the motor 1 whereupon the gear 5 will be stopped. In this operation of the parts, all of the apparatus will be stopped and the burner will be moved out of the firing position, the oil and air supply will be cut oil, in which position the parts will remain until the drop in temperature causes the thermostat to drop so as to close the circuit between contacts 50 again.

Should the operation of lever 9 by cam 7,

pawl 22 and latch 23 failto close the switch 28 for energizing the circuit to the fan motor and the oil supply pump, the switch 28 will fall downwardly and backwardly so as to move contact finger 31 into engagement with contact 32 by closing a circuit through wires 60 and 61 which will close the circuit to motor 1 through contacts 50 around the contacts 18 and 18 which have been disengaged by the pin 12 and thereby secure one complete rotation of the gear 5 so as to move the burnero'ut of firing position and their backinto firing position again. This will be obtained because the contact 31 will engage contact 32 long enough before the switch 28 drops past the finger 31 so that pin 12 will move sufficient to permit contact 18 to engage contact 18 through the preliminary motion of starting of motor 1 and the circuit through the points 50 being closed by reason of the contact 52 being at the low position. the circuits through contacts 18 and 18 will then remain closed until pin 12 again disengages contact 18 from contact 18' and stops the gear 5. During this rotation of the gear 5," the lever 9 will again be operated by cam 7, and will move switch 28 into closed position. Assoon as the switch 28 remains in the closed position the motor 1 will remain deenergized and gar 5 will retor and prevent further flow of oil.-

main in its position with the pin 12 disengaging contact 18 from contact 18. As a result the entire apparatus will be. set in operation for the heating cycle? The blower motor is indicated diagrammatically in Fig. 5 at 62- and the pump motor at 63. These motors receive energy through wire 64 connected with contact 65'of switch 28 and through blade 66 of switch 28 connected with wire 67 having circuit connection with the wire 53 to one side of the source of energy. The other terminals of the motors 62 and 63 are connected through the wire 68, stationary contact 68 of switch 28 and blade 70 to wire 71, which is connected to wire 56 and through thermostat 47 to wire 58 extending to the other terminal of the source of energy. Interposedin the circuit to the pump motor 62, that is between the connection of-wire 68 to one terminal of the motor 62, are the contacts 45 and 45a. The wire 68 is connected to one of the contacts 45' while the other contact 45 is connected by the wire 72 to the motor 62 so that whenever an over-flow of I oil from the burner occurs, the circuit to the tion until pm 12 engages contact 19' and pump will be opened by the over-flow oil running into the receptacle 44 overbalancing the lever 45 so as to move the contact 4512 out of engagement with contacts 45, thereby breaking the circuit. This will stop the pump mo- Having thus described my invention what I claim as new and desire to protect by Letters Patent of the United States is and means automatically controlling said power supply means in a predetermined manner.

2. An operating and control mechanism for hydrocarbonfuel burners of the class wherein the burner is movable into and out of firing position, said burner automatically cutting off the fuel supply in movement out of firing position; comprising a movable means connected with and for moving the burner, a rotary power source, motion transmitting means connected with said movable means and said power source, means operated in the rotation of said power source for permitting operation of said power source to produce successive cycles of operation periodically, and automatic means controlling the last-mentioned means and said power source and determining the period between successive cycles of operation.

3. An operating and control mechanism for hydrocarbon fuel burners of the class wherein the burner is movableinto and out of firing posit-ion, and a power driven mechanism supplies air to the burner; comprising a power driven mechanical unit including a movable means having connection formoving the burner, a rotary source of power, motion transmitting means connectmg said source of power with the movable means, means operated by the movable means controlling operation of said air supply mechanism, and

means for limiting each operation of said rotary source of powerto a predetermined cycle. a

4; An operating and control mechanism for hydrocarbon fuel burners of the class wherein the burner is movable into and out of firing position; comprising a movable means having connection for moving the burner, a rotary power source, motion transmitting means connected with said movable means and said power source, means operated bythe power source in the rotation thereof limit? ing each operation'to a predetermined cycle, and thermostatic means controlling the lastmentioned means and said power source.

5. An operating and control mechanism for hydrocarbon fuelburners of the class wherein the burner is movable into and out of firing position; comprising an operated means for moving theburner, an oscillating member having motion transmitting connections for operating-sald operated means, a rotary power mechanism, meansconnecting said power mechanism with the oscillating member for oscillating said member in the rotation of said "power mechanism, and automatic means for cillating member for operation thereby, a

rotary power source for-operating the oscil-- lating member, and automatic control means for said power source.

7. An operating and control mechanism for hydrocarbon fuel burners of the class wherein the burner is movable into and out of firing position, and power driven means is provided for'supplying air to the burner; comprising an automatically operable power driven mechanism for moving the burner ineluding a pivoted oscillating member, rotary means operated by said member connected with and vfor moving said burner, control means operated by said member for said power driven means, means for operating said member, and thermostatic control means for the last-mentioned means.

8. An operating and controlmechanism for hydrocarbon fuel burners of the class wherein the burner is movable into and out of firing position, and power driven means is provided for supplying air to the burner; comprising a unit assembly having a support independent of the burner, a rotary member on the support having connections with and for moving the burner, an oscillating member on the support for operating the rotary member, a control mechanism on the support operated by the oscillating member for govern-ing the operation of the power driven means, a source of rotary power on the support for driving said oscillating member, and control means for the source of power.

9. An operating and control mechanism for movable hydrocarbon fuel burners, comprising oscillating means for moving the burner, rotary means for operating the oscillating means, and automatic control means for the rotary means governed by the oscillating means to produce successive cycles of operation of said oscillating means and controlthe periodicity thereof.

y 10. An operating and control mechanism for hydrocarbon fuel burners of the class wherein the burner is movable into and out of firin position, and a power driven mechanism for supplying air to the burner; comprising an oscillating means having connection for moving said burner, a rotary power.

supply means, connecting means between said rotary power supply means and said oscillating means for operating said oscillating means in the rotation of the power supply means, cam operated means carried by the power supply means for controlling the operation of said air supply means in a prede termined manner, and automatically oper ated' means controlling said power supply means in a predetermined manner.

11. An operating and control'mechanism for hydrocarbon fuel burners of the class whereinthe burner is movable into and out of firing position; comprising an oscillating means having connection. for moving said burner, an electric motor driven power supply means, connecting means between said rotary power supply means and said oscillating means for operating said oscillating means in the rotation of said power supply means by said electric motor, circuit closers controlled by the operation of said rotary power supply means adapted to control'the energizing circuit for said electric motor, and thermostatic control means for the ener 'zing circuit of said electric motor cooperating with said circuit. closers in providing an automatic control for the operation of said burner.

12. An operating and control mechanism for hydrocarbon fuel burners of the class wherein the burner is movable into and out of firing position; comprising operated means, connected wlth and for. movmg said burner,

a rotary member for operating said operated means to produce-a cycle of operation of said burner in each rotation thereof, an electric driving means for said rotary member, circuit closers controlled and operated in the rotation of said rotary member to stop said driving means and rotary member by controlling the energizing circuit thereof, one of said circuit closers stopping said driving means and rotary member when the burner is out of firing position, and the other circuit closer stopping said driving means and rotary member when the burner is in firing position, and thermostaticmeans for energizing the circuit to start said driving means after each stopping thereof by said circuit closers.

13. An operating and control mechanism for hydrocarbon fuel burners of the class wherein the burner is movable into and out of firing position; comprising operated means connected with and for moving said burner, a

rotary member for operating said operated 7 means to produce a cycle of operation of said burner in each rotation thereof, electric means for operating said rotary member, circuit closers operated by said rotary member, included in the circuit of said electric means adapted to open said circuit when the burner is in firing and non-firing positions successively, and a thermostatic circuit closer for closing the circuitto said electric means after the operation of each of said first mentioned circuit closers to secure successive cycles of operation of said burner.

In testimony whereof I have signed my name to this specification.

BENJAMIN W. HURD.

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