US2660161A - Forced air circulating heater - Google Patents

Description

R. T. PEARCE Nov. 24, 1953 y FORCED AIR CIRCULATING HEATER Filed Feb. 2, 1951 w m m A Patented Nov. 24, n1953 UNIT-ED` STATES 'PATENT QFFICE j gesuiti 'y j y YFoxconn AIR tonwUIntrINc. fAa AI tobertl. Pearce, Moses Lake, Wash. t n-irp'plisation Fiirary 2, 11951,'seria1-No. v269,054

rolm. (crise-Lnb) The present invention relates to` the broad "class of heating vappliances and more particularly to a forcedair circulating heater. Y

'O'ne `object of the invention lies in the provision of an air circulating heater with a central 'depression or well which has an yair passage opening into the well at or adjacent its bottom and through which air passage air may enter thewell and upon becoming heated, rise and vpass from -the 4mouth of the well.

`Another object of the invention lies the provision of a motor driven fan adapted to, force the air into the well; through the Vpassage and thus create a forced circulation of the heated air. Another object ofthe invention is to provide the air passage with an air bale which directs.

provisionl of means for adjusting the 'baille to- 'Wardsand away from a seat at the mouthof the air passage and thus regulate the flow `of air .into the well according to the heat of the well .and thus' preclude over or under heating the walls of the well.

These and other objects of the invention" will become apparent during the course of the following description.

In the drawings, forming a part of this specification, and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a perspective View of a floor type oil furnace embodying my invention and having a portion of the shell broken away for convenience of illustration,

Figure 2 is a vertical cross section taken through the furnace as at line 2-2 of Figure 1, and

Figure 3 is an enlarged fragmentary cross section showing the exhaust port of the air passage into the well and the adjustable baffle thereof.

Experiments have proven to me that the most economical method of extracting heat from any given fuel does not lie in the degree of combustion only but also in proper disposition of the heat produced by combustion. It therefore became apparent that the ideal method of heating, from an economical standpoint, was to maintain the heating appliance at the proper temperature for good combustion and also remove all of the excess heat by the air. To embodirv zthisinvention in :a working device, I have provided a floor furnaceV 4 Whichhas the usual Ametal yshell 5 and the -grii which forms'aiousure, for the open top of the shell. The Ashell is formed with two side walls 1 and 8,

end walls 9 and la and a bottoni wall Il.

Within the sneu .I have provided metal fire` box .-I2 which is circular in cross. section and is shown` as being an oilburner.v It willbe understood that anytyperebox may beusd which is adapted to Aanydesired Ytype fuel without changing the essence of my invention. The re box shown has a `bottom;wall It and an upstanding circular wall [3f deningthe fire box. Fire clay ld or other suitable heat insulation is -piovided in the bottom ofthe lire boxand aircular vflange i5 isspaced above the 1topsurface of the re clay and rests upon the upstandingpe- `riphveral edge Ill'fof the nre claymljfl. spaced above the 4fiange 4is a second circular flange `IE5 which is supported upon multiple inwardlyk extending rivets `or bosses l1 in the side wall i3 of the re box. Each of 'the flanges is provided with a central opening as [8 and 19. A fuel supply tube 2d enters the fire boi; through one side thereof and admits the fuel oil from the regulator 2i for combustion, `Asupplypipe 22 ,enters the shell 5 and supplies the fuel oil to the regulator from a storage tank or source of supply (not shown). An opening or door (not shown) may be provided for lighting the nre or an electric nre starter may be installed.

Adjacent the top of the wall I3 and extending radially therefrom, I have formed a sleeve 23 which communicates with the nre box and is adapted to enter a regulation size stove pipe length 2li, thus forming the flue connection to exhaust the smoke and fumes accompanying combustion.

Spaced ico- axial shields 25 and 26 are positioned about the outside of the rebox and a natural air passage is thus formed between the wall I3 and the inside shield 25. Since the inside shield is preferably formed of metal, it will absorb a quantity of heat, and to prevent this heat from being transmitted to the shell 5, the second shield 2t is provided. The top edge of shields 25 and 26 are disposed at an inward angle as at 2 to direct the upwardly flowing heated air inwardly instead of allowing it to spread before it is emitted from the top grill.

Suitable brackets as :46 support the shields, re box and a fan 38 from the bottom wall Il of the furnace shell 5.

To close the top of the frebox, I have provided a cover 28 formed with a central well 29 and the well has a hemispherical bottom wall 30 disposed above the openings I8 and I9 of the crcular flanges I and I6. An upwardly diverging conical side wall 3| extends from the bottom wall 30 and at its upper edge merges into a rolled top 32. The cover 28 thus appears circular when viewed in plan, and the rolled top appears semicircular when viewed in cross section as shown in Figure 2. The top 32 terminates in a downwardly extending outer edge 33 which is provided with an inwardly offset portion 34 adapted to fit within the fire box wall I3', and rivets 35 secure the cover 28 to the firebox I2.

Adjacent the bottom wall 30 of the Well 29 and extending radially from the well, `a sleeve 36 is pressed outwardly from the wall 3| Aand is adapted to receive a cast pipe or air passage 3'!A which extends from a motor driven fan 38 through fire box I2 and terminates in sleeve 36 of well 29. The ail` passage 31 is of such diameter as to t tightly in the sleeve 3B and thus 4 moved, less fuel is used to provide proper rooni temperature.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

In a forced air circulating heater the combination with a re box having means for supplying fuel and a flue communicating with said fire box adjacent the top thereof for venting smoke and gases and means for supporting said rebox, of a cover for said fire box, a well in said cover, a downwardly converging conical inner wall forming the sides of said well, a hemispherical wall forming the bottom of said well. whereby said combustion smoke and gases pass upwardly about said well and heat the walls form an air tight seal between the Well and the Y yshank 42 threaded into sleeve 49 is supported thereby and adapted to form a variable or adjustable closure for the air inlet into the well 28. An angled peripheral edge face 43 is formed on the baffle, and a slot 44 is provided in its outer face to receive the bit of a screw driver for adjusting the baille towards and away from the seat 45 formed about the inner opening of sleeve 36.

When the fire box is heated, the fan is turned on, and the baille 4I is adjusted to allow the desired amount of air to be forced into the Well, and to be directed by the baille along the surface of the well where it will absorb the heat and carry it into the room. The well is thus kept at the lowest temperature found effective for adequate combustion of fuel in the rire box and since the heat produced is promptly rethereof, a horizontally extending sleeve adjacent thebottom of the well and communicating therewith, a motor driven fan positioned outside said re box, an air duct passing through said re box and terminating in said sleeve and communicating said fan with said well, a spider on the end of said air duct, an internally threaded sleeve supported by said spider and having the axis thereof extending substantially radially of said hemispherical wall, a baille plate, a central depending threaded shank on said baille plate threaded into said threaded sleeve, the peripheral underface of said baille plate having a bevelled periphery, and a slot in said baille plate, whereby the baffle plate may be adjusted toward and away from a seat about said sleeve to control the volume of air entering said well.

ROBERT T. PEARCE.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 388,360 Hill Aug. 21, 1888 457,250 Brayer Aug. 4, 1891 470,727 Wattles Mar. 15, 1892 641,772 Heitzelmann Jan 23, 1900 870,686 Reid Nov. 12, 1907 2,113,739 Newman Apr. 12, 1938 2,462,395 Heiman Feb. 22, 1949

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