US2380719A

US2380719A - Air and fuel supply controlling means for furnaces or the like

Info

Publication number: US2380719A
Application number: US388033A
Authority: US
Inventors: Thelma R Blauvelt
Original assignee: Individual
Current assignee: Individual
Priority date: 1941-04-11
Filing date: 1941-04-11
Publication date: 1945-07-31
Anticipated expiration: 1962-07-31

Description

I July 31, 1945- H. E. BLAUVELT AIR AND FUEL SUPPLY CONTROLLING MEANS FOR FURNACES OR THE LIKE 2 Sheets-Sheet 1 Filed April 11, 1941 INVENTOR. HOMER t'. BUN/V511 July 31, 1945. H. E. BLAUVELT 2,380,719

AIR AND FUEL SUPPLY CONTROLLING MEANS FOR FURNACES OR THE LIKE Filed April 11, 1941 2 Sheets-Sheet 2 INVENTOR'. HOMER E. Bun/v51]:

ATTOENEK Patented July S1, 1945- UNITED srrrna;

AIRAND MEANS FOR FURNA Homer E. Blauvelt, Flushing,

Blauveltexecutrix of said Homer E.

deceased CES OR THE LIKE N. Y.; Thelma. It. Blauvelt,

Application April 11, 1941, Serial lilo. 388,033

.6 Claims.

This invention relates generally to air control means for oil burners, gas burners, burners using finely comminuted or powdered combustible material, etc., and more particularly refers to a regulating means for simultaneous control of pri-" mary air and secondary air supply to the burner.

It is an object of the present invention to provide efllcient primary air and secondary air supply control means which are automatically regulatable according to the combustible load fed to the burner or furnace.

It is a further object of the present invention to provide simultaneous control of the primary air and secondary air supply to a burner or furnace, adjustable in accordance with a minimum and amaximum predetermined rate of fuel supply flow to give substantially perfect combustion for varying quantities of fuel supply fed to said burner up to said maximum flow.

It isyet another object of the present invention to provide a substantiallyuniform CO2 con-,

, tent of the flue gases by regulation of the primary and secondary air admission and the fuel.

A further object of the present invention is to provide in such a burner or furnace the required proportion of primary and secondary air to the combustible fuel, to give substantially perfect combustion, and to maintain this proportion irrespective of the amount of fuel consumed.

Another object of the present invention is to provide primary and secondary air supply operating means for such a humor or furnace which means are accurately and simultaneously controlled for bringing about efllcient combustion with maximum CO2 content within the furnace.

In carrying out foregoing objects of the present invention there is provided a heating system employing a fuel burner apparatus and means for-regulating the flow of fuel to said apparatus; with air admission means cooperable with said burner apparatus, rotatable means controllable by said regulating means, and means operable by I said rotatable means for controlling air supply through said air admission means in accordance with the amount of fuel supplied tofsaid apparatus for producin a. desired proportion of air to fuel consumed and substantially maintaining said proportion during varying rates of flow of said consumed rate of flow thereof. I

This invention accordingly consists in the feafuel up to a. predetermined maximum To enable others skilled in the art so fully to comprehend the underlying features thereof that they may embody the same by the modifications in structure and relation contemplated by this invention, drawings depicting a. certain form of the invention have been annexed as a part of this disclosure, and in such drawings, like characters of references denote corresponding parts throughout all the views, of which:

Fig. 1 is a front elevational view of a boiler with mechanism made in accordance with the invention.

Fig. 2 is a side elevational view partly in section of Fig. 1. e

tures of construction; combination of parts and I in the unique relations of the members and in the relative proportioning and as more completely outlined herein.

disposition thereof; all

Fig. 3 is a sectional view taken along line 3-3 of Fig. 1 showing the pressure regulator with its connection to the operating shaft connecting the levers. embodied in the invention.

Fig. 4 is a sectional view taken along line 4-4 of Fig. 1 showing the primary air inlet and adjustable connection to the operating shaft.

, Fig. 5 is a cross sectional view taken along line 5-5 of Fig. 1 and showing the adjustable secondary air control and connectionto an operating shaft. 1

Referring now to the drawings, although there is shown a fire tube boiler l0, it is understood that any other type, such as a water tube boiler, locomotive boiler, etc., may be employed, this device forming no part of the invention.

Boiler I0 is supported by the conventional foundation walls I I forming the fire box l2 from which the flames F and hot gases enter the fire chamber I 3. These flames and hot gases will heat the water l5 around the tubes l4, such flames and hot gases finally reaching the front chamber I6 and from there passing through the chimney or smoke stack II. All this is conventional and formsno part of the invention.

On the front plate l8 of the boiler is a shaft I9 rotatably mounted in bearings 20, 2|.

' ed upon the front plate 22 of boiler I0 is a thermostat control or arm 24 connected by means of a connecting rod 25 and lever 26 to shaft IQ for causing shaft I9 to rotate in accordance with pressure regulator 23, which is determined by the pressure in boiler Ill. V The movement .of arm 24 'will range within an are up to about sixty degrees to ninety degrees. The burner apparatus 21 comprises the upright hollow member 28, burner member 29, and fuel line 30. A control valve 3|, which controls the flow of fuel to the burner 32 is connected by means of connecting rod 33 and lever 34'to shaft l9.

Mounta pressure regulator 23, having an v the pressure in the Within hollow member 23 is a butterfly valve or damper 35 which controls the primary air supply to burner 29 the fuel and air mixture being burned below burner element 32. This opening 31 can be closed by a door 38, which door controls the secondary air supply entering the fire box I 2. Door 38 is controlled from the rotatable shaft l9 by means of an arm 39 having an arcuate slot 40 and a sliding member 4| which can be securely clamped by conventional means within slot 40 at a predetermined position to be later described. A chain or cable 42 connects sliding member 4| to door, dam-per or valve 38 of secondary inlet 36. This cable 42 is guided over the

fixed pulleys

43, 44, 45, respectively.

The arm 33 is provided with counterweights as shown at 53 so as to assist in balancing the weight of the damper door 38. The butterfly valve 35 is controlled from rotatable shaft l3. For this purpose an arm or lever 43 is connected to shaft I3,

air supply required for a sixty gallon per hour fuel oil flow, the above procedure is repeated. If at any future time it is desired to run the furnace with a steam production equivalent to the flow of, say forty-five gallons of fuel oil'per hour, the clamping members 4|, 52 of connecting cable 42 and connecting rod 43, respectively, are clamped in these positions within the slots 40, 5|, marked for this fuel oil consumption, thereby repeatedly producing the most efiicient combustion through the supplying of the correct amount of primary and secondary air to the fuel burner.

- This arrangement, in other words, will always assaid lever 43 having an extension 50 provided with an arcuate slot 5|. A member 52 is slidable in slot 5|. An arm 46 connects with butterfly valve 35, said arm 46 having a counterweight 41 at its free end. Sliding member 52 is provided with clamping means to secure the sliding member 52 within slot 5| at a predetermined position for a purpose later on described.

Referring now more particularly to

arms

33 and 49, the curvature of slot 5| is determined when the arm 43 is at its lowest position as indicated at 43, 52' by describing an arc using point 43' as a pivot and rod as a radius. At this time secondary air inlet arm 33 will also be at its lowest position as indicated at 39'. Curvature of slot 4) is determined by the relation between sliding member 4| within slot 40 and the required position of the damper door 38, and swinging section 42 of cable 42 about the surface of pulley 43 when arm 33' is in its said lowest position. The furnace burner 32 at this time is receiving oilfor producing the lowest practical flame. The

butterfly valve and damper door 38 are now adjusted by hand and secured in their adjusted positions, this position of valve 35 being indicated by 35:: and the corresponding position of arm 43 by 45a, for the flame to burn the most efllcient way producing a predetermined 00:. Valve 35 is secured in its adjusted position by tightening screw 35' and door 33 is secured in its adjusted position by means of the knot K of cable 42. Regardless of position of 52 within slot 5| and of 4| within slot 40, the positions of valve 35 and door 38 will always be the same when shaft l9 brings

arms

43 and 39 to their lowest positions once the locations of the respectivesliding members 4| and 52 have been determined in accordance with the fuel used and the required primary and secondary air necessary for complete combustion. The .oil supply to the burner is now increased to a flow of, say, eighty gallons per hour, indicating a maximum flame desirable for a particular purpose. The valve 35 and door 38 are then again adjusted, this time, however, for an air supply giving the most eflicient combustion and thereby again a theoretical maximum 002. Slots 40 and 5| are now again marked off for positions for high fire, thereby obtaining the graduation marks 52 and 53, respectively. for high fuel consumption. For obtaining graduations' or points between these and low fuel oil flows, for example, to determine the primary and secondary sure the correct proportion of fuel, primary air and secondary air, thereby giving the desired predetermined CO2, no matter how much fuel is being consumed at any particular time between the lowest practical flame and the maximum predetermined flame.

Operation To start off a cool boiler, more oil will ,be required in the combustion chamber of the boiler to bring the pressure up as quicklyas p ssible. This may require in one particular instance the consumption of eighty gallons of oil per hour. Assuming that the necessary amount of pressure has been reached within, say, one hour and onehalf, it will be found'that only sixty gallons of oil per hour are required to maintain the required steam pressure. The control valve 3| is now set for this oil flow and clamping members 4| and 52, which at first had been clamped to the proper location for eighty gallons of oil per hour will now be moved along the slots to the respective indicated graduations on

arms

33 and 49 for sixty gallons per hour. If a change in oil supply should be desired these clamping members 4| and 52, respectively controlling the primary and secondary air supply will be adjusted accordingly. Therefore, if the pressure regulator 23 reacts on the rotating shaft |9 on account of the predetermined pressure setting, and pressure regulator 23 continuously maintains this pressure, the primary and secondary air supply to the flre box will be always-such as to provide theproper proportion of air and fuel, thereby producing the most perfect combustion or, in other words, a substantially theoretical maximum CO2.

It is obvious that. since the oil supply control lever 34, the primary air supply lever 43 and the secondary air supply lever 39 are all secured to the common shaft l9, and since the shaft l 9 is rotated by the action of lever 23 mounted on shaft l9, and further since lever 23 is set into motion by the action of pressure regulator 23, that all these said arms will move and operate their respective mechanisms simultaneously, and in accordance with the predetermined settings.

It is understood that although the invention has been described with reference to oil burners, the aforementioned primary and secondary air control mechanisms may be-employed in connection with furnaces or boilers using other fuels,

such asfor example, natural or illuminating gas,

require or experience suggests without departing from the spirit of the invention within the scope of the appended claims.

Having thus described the invention what is claimed as new and desired to be secured by Letters Patent, is:

1. In combination with a heating apparatus having a front plate, a fuel burner and means for supplying fuel to said burner; means for controlling the supply of fuel to said burner, said means including spaced bearings fixed to said plate, a rotatable shaft mounted in said bearings, means for admitting primary air to said apparatus, means for admitting secondary air to said apparatus, means for controlling the quantity of primary air to said apparatus, means for controlling the quantity of secondary air to said apparatus; one of said air controlling means comprising a member fixed to said shaft mounted in said bearings to rotate therewith, said member having a curved slot, a valve device for one of said air admitting means, an arm connected at one end to said device and having a weight adjacent its other end, a link pivotally connected at one end to said arm between said weight and said device, and a member at the other end of said link slidable in said slot; the other of said air controlling means comprising a. member fixed to said shaft mounted in said bearings to rotate therewith, said last mentioned member having a curved slot, a movable damper device for the other of said air admitting means, a flexible connection, one end of said connection being secured to said last mentioned device, and a member fixed to the other end of said connection and slidable in said last mentioned slot.

2. In combination with a heating apparatus having a front plate, a fuel burner and means for supplying fuel to said burner; means for controlling the supply of fuel to said burner, said means including spaced bearings fixed to said plate, a rotatable shaft mounted in said bearings, means for admitting primary air to said apparatus, means for admitting secondary air to said apparatus, means for controlling the quantity of primary air to said apparatus, means for controlling the quantity of secondary air to said apparatus; one of said air controlling means comprising a member fixed to said shaft to rotate therewith, said member having a curved slot, a valve device for one of said air admitting means, an arm connected at one end to said device and having a weight adjacent its other end, a link pivotally connected at one end to said arm between said weight and said device, and a member at the other end of said link slidable in said slot.

3. In combination with a heating apparatus having a front plate, a fuel burner and means for supplying fuel to said burner; means for con-n trolling the supply of fuel to said burner, said means including spaced bearings fixed to said plate, a rotatable shaft mounted in said bearings, means for admitting primary air to said apparatus, means for admitting secondary air to said apparatus, means for controlling the quantity of primary air to said apparatus, means for controlling the quantity of secondary air to said apparatus, one of said air controlling means comprising a member fixed to said shaft, said mem-' her having a curved slot, avalve device for one of said air admitting means, a flexible connection, one end of said connection being secured to said device, and a member fixed to the other end of said connection and slidable in said slot.

4. In combination with a heating apparatus having a front plate, a fuel burner and means for supplying fuel to said burner; means for controlling the supply of fuel to said burner, said means including spaced bearings fixed to said Y plate, a rotatable shaft mounted in said bearings,

means for admitting primary air to said apparatus, means for admitting secondary air to said apparatus, means for controlling the quantity of primary air to said apparatus, means for controlling the quantity of secondary air to said apparatus, one of said air controlling means comprising an arm fixed to said shaft to rotate therewith, said arm having a curved slot, a valve device at one of said air admitting means, and connecting means between said device and said arm, said connecting means including a member slidable in said slot; the other of said air controlling means comprising a member fixed to said shaft, said latter member having a curved slot, a valve device at the other of said air admitting :means, a connection having one end secured to said latter mentioned device and its other end secured in the said last mentioned slot.

5. In combination with a heating apparatus having a front plate, a fuel burner and means for supplying fuel to saidburner; means for controlling the supply of fuel to said burner, said means including spaced bearings fixed to said plate, a rotatable shaft mounted in said bearings, means for admitting primary air to said apparatus, means for admitting secondary air to said apparatusmeans for controlling the quantity of primary air to said apparatus, means for controlling the quantity of secondary air to said apparatus; each of said air controlling means comprising a movable damper tive air admitting mea an arm fixed to said shaft to rotate therewith, said arm having a curved slot, and means connecting each of said damper devices with said arm, said connecting means having a part slidable in said slot.

6. In combination with a heating apparatus having a front plate, a fuel burner and means for supplying fuel to said burner; means for controlling the supply of fuel to said burner, said means including spaced bearings fixed to said plate, a rotatable shaft mounted in said bearings, means for admitting primary air to said apparatus, means for admitting secondary air to said apparatus, means for controlling the quantity of primary air to said apparatus, means for controlling the amount of secondary air to said apparatus; each of said air controlling means comprising a movable damper device at the respective air admitting means, an arm fixed to said shaft to rotate therewith, said arm having a curved slot, and means connecting said device HOMER E. BLAU'VELT,

device for the respec-