US2117787A

US2117787A - Burner regulating mechanism

Info

Publication number: US2117787A
Application number: US660685A
Authority: US
Inventors: Oscar L Bock
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-03-14
Filing date: 1933-03-14
Publication date: 1938-05-17
Anticipated expiration: 1955-05-17

Description

Filed March 14, 1953 2 Sheets-Sheet l v jn x eni'ofi GaoaziBoc/. at I M May 17, 1938. o. L. BOCK BURNER REGULATING MECHANISM 2 Sheet s-Sheet 2 Filed March 14, 1935 06c arZ. Boa/5.

ZV/izws 5 Patented May 17, 1938 PATENT OFFICE BURNER REGULATINGMEOHANISM Oscar L. 11ock,'Madison, Wis.

Application March 14,

' 3 Claims.

' open position, and which provides a relief valve to permit abnormal pressures in the furnace to be relieved and escape through the chimney.

A further object is to provide damper regulating means operatively and synchronously associa'ted with certain partsof the burner equipment and a thermostat, whereby the burner normally controlled by the operation of the thermostat will be prevented from operating except when the damper is open.

Numerous other objects and advantages will be apparent throughout the progress of the following specification.

The accompanying drawings illustrate a selected embodiment of the inventionand the-views therein are as follows:

Fig. 1 is a detail elevation of a furnace or other heating element and embodying the invention, the view showing the relative arrangement of the parts diagrammatically.

35 Fig. 2 is a detail vertical sectional view through the burner regulating mechanism and, showing its association with parts of the burner equipment.

Fig. 3 is a detail end elevation of the damper operating mechanism.

40 Fig. 4 is a detail end elevation of the damper operated switch.

Fig. 5 is a detail sectional view on the line 5--5 of Fig. 3. a

Fig. 6 is a detail sectional view of Fig. 5. 3

Fig. 7 is a view similar to Fig. 6 but showi some of the parts moved from initial toward crating position.

Referring to the drawings, I II designates a furnace, boiler or other heating member which is provided with a burner H, such as an oil burner or other heating element. eludes the oil supply, the blower, and such other equipment necessary to cause combustion of the fuel. A flue l2 leading from the furnace I0 is on the line 8 -6 The burner II in-.

1933, Serial No. 660,685 (01. 236-1) operatively connected to a chimney 3 in the usual manner.

A damper I4 is carried by a supporting collar 'or frame l5 which may be fastened to the flue l2 as shown in Fig. 1. The damper M has end 5 shafts l6 and ll fixed thereto, and these shafts are revolubly mounted in the damper frame l5, Fig. 2. An arm I8 is rigidly connected to the shaft l6 and has a shoulder l9 formed thereon which is adapted to be engaged by a shoulder '10 'on the arm 2| which is freely mounted on the shaft IS. A spring 22 is interposed between the arms I8 and 2| and in engagement therewith to provide a yieldable. connection between these two arms. The arm 2| is pivoted at 23 to a link or connecting arm 24 which 'is pivoted at 25 to a connecting arm or crank- 26. The connecting arm or crank 26 is operated by the shaft 21 of a motor 28.

"A thermostat 29 is positioned in a room or the living quarters of the building in which the burn- ,er is located and is provided with contacts 30 and 3| connected to the

terminals

32 and 33 respectively which lead to the motor 28, Fig. 2. A suitable contacting device, such as a mercury tubeKSfl, is controlled by suitable means operated by the rise and fall of the temperature. When the temperature of the room in which the thermostat is located reaches a predetermined minimum. the mercury tube 34 will be moved to the position shown in dotted lines in Fig. 2 and complete the circuitbetween the contacts 30 and 3| to operate the motor 28. The closing of the contacts 30 and'3l causes the motor to rotate 180, the motor being constructed and arranged to rotate only 180, and then cease. The 180 rotation of the motor 28 will move the crank 180 and cause the members 24 and 2| to rotate the shaft l6 and consequently the damper 90. at which time the damper will be in open position. 40

A mercury switch arranged in a casing 38, Figs. 2 and 4, is fastened to a bracket support 31 which is fixed to the frame IS. The switch has a shaft which is fixed to thedamper shaft H as indicatedv at 39, .Fig. 2, and ismovable there- 45 with. An arm is mounted on the shaft 38 and carries a mercury tube 4| having

conductors

42 and 43. The conductors l2 and 43 are operatively connected to conductors 44 and 45 which lead to the burner equipment When the mercury tube 4| is in the position shown in Fig. 4, the mercury 46 will be at one end of the tube, but when themotor 28 operates to open the damper andnonsequently swing the arm 60 by the spring 5| from the position shown in full lines to the position shown in dotted lines in Fig. 4, the mercury 46 will close the contact between the conductors l2 and 43, cause the current to flow through the conductors 44 and 45 and operate the burner equipment II. The burner will then operate until sumcient heat has been delivered to cause the thermostat toagain operate and break the con- The parts are so constructed and arranged I that the position of the damper controls the op- .eration of the heating equipment because when the damper is closed the burner equipment cannot operate. Therefore, the device completely safeguards the burner against the possibility of firingwhen the damper is in any but in open .position. If the motor 28 should fail to operate,

no hazard is created because the switch 35 cannot close. If the damper I4 is stuck or corroded tight so that it cannot open, no hazard will be created as the burner will remain in off position.

A break in either circuit with the damper in closed position will create no hazard. Also, a break in either circuit with the damped open will not create a hazard. Current failure at any time will cause a shut-down of the equipment regardless of the position of the damper. Due to the yielding connection between the damper l4 and the arm 2|, the damper is permitted to open against a pressure on its face from within the furnace. .Therefore, should any abnormal pressure occur against the damper It, the damper will be allowed to rotate away from the shoulder against the tension of the spring 22. When the pressure against the damper ceases, the spring 22 will be returned to its normal position. The damper herein is pivoted above its normal axial center line.

The burner II is preferably wired to a. separate line but if desired, the burner motor can be fed from a line running from the motor 28 or taken from the thermostat in which case the thermostat 29 and the switch '35 will be in'series. The breaking of either of these switches will cause the burner to stop before the damper starts to close. Furthermore, the burner will not start un; til both of the switches are closed.

The invention provides a thermostatically controlled driving means operating a damper through a yieldable member. The damperopcrates a switch mechanism which controls the operation of a burner with respect to the position of the damper, and the damper is mounted off center so that it may be opened against the tension of the spring when there is pressure against the face of the damper. This construction provides for the necessary lag or lapse of time between the time the thermostat starts 0 open the damper and the starting of the burner. The burner stops quickly before the damper closes more than a fraction of its swing. This is due to the use of an independent switch which has no connection with the thermostat or damper op erating mechanism. Therefore, the burner is provided with independent timing means and overcomes the objection to conventional burners now on the market which are so arranged that when the thermostat closes, its circuit starts the burner and the damper opening mechanism at the same time as both of them are connected di- 7 a switch which starts and stops the burner sole- 1y through the movement of the damper in the smoke-pipe of flue l2. When the damper is closed, the burner is stopped and when the damper is opened, the burner starts. The thermostatically controlled mechanism 29 causes the operation of the damper by opening or closing the same depending upon the temperature in the room, which temperature governs the operation of the thermostat. The spring relief and the mounting of the damper above its center line permits the damper .to be moved a sufiicient distance to overcome abnormal pressures in the furnace. When the temperature in the room reaches a predetermined minimum, the thermostat 29 will operate and cause the motor 28 to open the damper. The movement of the damper will cause the switch to operate to start the burner equipment. However, it is to be noted that the damper will be almost to its open position before the switch 35 operates to start the burner equipment. When suflicient heat has been generated to again effect operation of the thermostat 29, the thermostat 29 will cause the motor 28 to operate and swing the damper from open toward closed position. Slight movement of the damper l4,however, will quickly break contact of the switch 35 and cause an interval of time between the stopping of the burner equipment and the complete closing of the damper. Therefore, the pressures and gases in the furnace will be dissipat ed before the damper completely closes. As the damper closes shortly after the shut-off of the burner equipment, the heat in the furnace is kept for useful heating, purposes instead of being rapidly dissipated through the flue.

The switch 35 is provided with adjustable means 50 for setting and/or limiting the movement of the arm 40, there being a spring 5!, Fig. 2, provided for yieldingly operating the arm 40.

The invention provides new and improved simply constructed, positively and eificiently operated means for controlling the stopping and starting of the burner equipment which is controlled by the position of a damper.

Changes may be made in the form, construction, and arrangement of the parts without departing from the spirit of the invention or sacrificing any of its advantages, and the right is hereby reserved to make all such changes as 'fairly fall within the scope of the following static control means being operatively connected ,to the damper to selectively move the damper to open or closed position, a switch connected with the damper, said switch connection being arranged to actuate the switch to closed position when the damper has opened a predetermined degree and to return the switch to open position when the damper has closed a predetermined degree, said switch being wired to said burner actuating means for control thereof in accordance with the setting of the switch, the damper being yieldabie by a predetermined elevated pressure within the furnace toward open position, and means to permit said yieldable opening of the damper within limits without closing the switch.

2. A combustion system comprising a furnace,

a burner for the furnace, means to actuate the burner, a flue leading from .the furnace for conveying off the combustion products of the burner, thermostatic control means arranged in operative relationship to the furnace and operable in accordance with temperature conditions created by the furnace, a damper in said flue and operable to open or closed position, the thermostatic control means being operatively connected to the damper to selectively move the damper to open or closed position, a switch connected with the damper, said switch connection being arranged to actuate the switch to closed position when the damper is opened and to return the switch to open position when the damper is closed, said switch being connected to said burner for control thereof, said damper being yieldably supported for actuation toward open position by a predetermined increased pressure within the furnace when the damper has been selectively actuated to said closed position by the said thermostat, said switch and damper connection being arranged 'to permit said yieldable opening without actuating the switch toclosed position.-

3. A combustion system comprising a furnace, a burner for the furnace, means to actuate the burner, a flue leading from the furnace for conveying off the combustion products of the burner,

thermostatic control means arranged in operative relationship to the furnace and operable in accordance with temperature conditions created by the furnace, a damper in said flue and operable to open or closed position, the thermostatic control means being operatively connected to the damper to selectively movethe damper to open or closed position, a switch connected with the damper, said switch connection being arranged to actuate the switch to closed position when the damper is opened and to return the switch to open position when the damper is closed, said switch being connected to said burner for control thereof, the damper being yieldable subject to a predetermined elevated pressure within the furnace toward open position, and means to permit said yieidable opening of the damper within limits without operating the burner.

OSCAR L. BOOK.