US1817368A - Gas furnace - Google Patents

Description

Aug. 4, 1931. F. E. GRUNWALDT ,3

' GAS FURNACE Filed March 29. 1928 2 Sheets-Sheet 1 W m Ii E W /I W i 1 I I 44 HU r u I 21; K r (A I 3 3 6 i 2 W0 ,0 /2 7 i) W 8 (IN g 5 V3 II H42 fimkmmmur I ATTORNEY Aug. 4, 1931. F. E. GRUNWALDT GAS FURNAG E 2 Sheets-Sheet Filed March 29, 1928 f'rankfi am ufir ATTORNEY ID :The object ofthe invention'is to Patented Aug. 4, 1931.

'GRUnwA nT, or, SEATTLE, wnsnmefron ens FURNACE The invention is a furnace that isparticularly adaptable for burning gasin which the Wall of the fire box is corrugated or formed with channels'and a central air heating cham- 23 her-1 is. provided inthe center of the fire box withra'conical lower end which deflects the hot gases outward so'that they will passupwardthrough the corrugationsor channels in the walls of'the fire box. 1

furnace,the interiorof which is so" arranged that gas maybe used as fuel and at the same time the fuel cost .keptbelow' the average. -Another object of the invention is to proi rfi vide. a gasheating furnace in which practically all of the heat unitsinay be extracted from the gas:

. Another ob'ect theinvention is to provide .a heating furnace in which air isc1r-.

culated through and around the fire box.

Another object of theinventionis to provide a heating furnace in whichthe wall of the fire box; is provided with corrugations or comparatively deep channels into which the hot gases are deflected so that the hot gases; will travel upward through the channels. r Another object of the inventionis to pro- 'vide a, furnace in. which the wall of the fire "370 .box' is provided with corrugations: or com-- paratively deep channels so that the heating surface is considerably multiplied. I I i I Anotheriobject of the inventionis to provideacombination of afirebox having a corrugated wall with a central heating chamber in the center of the lire box therebyconsider- I ably multiplying the directheating surface.

. Another object of the invention is to provijde means for forming a'joint in the wall of ing to be opened so that the entire interior may be withdrawn without moving the casing' or the flue connections thereto.

. 'Another ob'ect of the inve t on is to pro- .vide means for connecting the upper and lower ends of the side walls of channels in the wall of a furnace firebox to permit drainage and expansionwith simplicity.

Another object'of-the invention is to pro vide-i neansfor connecting the side walls of a provide a a furnace casing; which will. permit the cas-' openings.

' Application filed March 29, 192s. Serial 110.265,?70.

furnace casing to the furnace front through I which the; side walls will [be drawn or.

stretched as they are clamped in place.

A further obj ect of the invention is to proi vide means for.constructingthe interior of 55 a furnace'so that the gasesfrom the flames will pass upward and be deflected outward 1nto the corrugations or channels-in thewall of the fire box and then pass downward to a flue opening. I m I I A still furtherobject of the invention is to provide a furnace having a central ainheat- I g ilng chamber witha'conical shaped lower end which is provided with intake passages through the lower end, the cross sectionalarea of which is equal to the cross sectionalareaof I the chamber.

And a still further object of the malari II is to provide a gas furnace which provides economlcal gasconsumption'and which'is of a simple and economical construction,

With these ends in view the invention em I v bodies a furnaceha'ving a fire box, with walls havmg corrugations or channels", a central chamber with a conical shaped lower endhaving passages extending therefrom through the wall at the lower portion of thefire'box, a

flueextending from the said fire'box,and an outer casing having aslip joint at the front.

2nd clamp joints at the sides ofthe furnace ront.

' Other features and advantagesofthecin- I .vention will appear from the following (113- y scription, taken in connection withthe draw-v ings, wherein I "Figure 1 is'a vertical cross section showing thefurnace.

I Figure 2 is a similar section "showing the lower portion of the furnace witha forced I draft air duct entering the rear thereof. i r

Figure 3 is a cross section through the upper part of the furnace on line 3 3 of Figure 1. i

' Figure 4 is a similar section showing a por- 9 tion of the fire box with a plate'connecting the outer ends of the corrugations. I

Figure 5 is also a similar section showing a fire-box divided into two-parts with two. flue in the outer chamber 3 Figure 6 is also a similar section showing corrugations of a different shape.

Figure 7 is a detail showing the means for connecting the ends of the sides of the ,corrugations to the top and bottom.

Figure 8 is a similar view showing the edge of the plates.

Figure 9 is a detail showing the means of connecting the lower portion of the outer casing to the furnace front.

In the drawings the furnace is shown as it would be made wherein numeral 1 indicates the inner air heating chamber, numeral 2 the fire box, and numeral 3 theouter chamber.

r In the structure shown the inner chamber is formed with a cylindrical casing 41 having a cone 5 at the lower end, and it understood that although this is shown in a cylindrical'shape it may be oval, square or of any other suitable shape. The cone 5 is provided with passages 6 which extend through'the fire box 2 and through the wall 7 which forms the wall of the lower portion of the fire box 2. At the lower end and at the front of the fire box 2 is a'passage 8 which connects to the furnace front 9 and is provided with a door 10 having a ventilator 11 therein. At the rear of the casing is a duct 12 through which a gravity flow of air will pass into the casing.- A feeder pipe 13 extends through the door to a burner as shown'in Figure 1 and the outerend of the feeder pipe 13 may be connected by a pipe 14 to any suitable fuel supply. The fire box extendsupward as a cylinder to the point 15 and at this point the "actual wallsof thefire box are corrugated or provided with channels 16 and it will be observed that the fiames'and hot gases from the fire will travel upward until they strike the cone 5 and then be deflected outward so that they will pass upward through the chan nels 16. These channels may be triangular shaped asshown in Figures 3, 4-, and 5 or of a rectangular shape as shown. in Figure 6 or of any other suitable shape. It will be noted that onthe opposite side of the walls of the channels 16are other channels which are inidicatedby the numeral 17 whichmay be known as exterior or air channels and the air Wlll pass upward through these channels with considerable velocity as the space between the walls of the channels will beheated to a very high temperature and the air therein will paf'supr-zard. At the same time the air in the chamber 1 will also pass upward with considerable velocity as this chamber will also be heated to a very high temperature and it will therefore be possible to heat a large quantity of air to a very high temperature in a very short time so that a comparatively small furnace will have considerable capacity. The furnace will also havea maximum efficiency as the area of the fire box is comparatively small owing to the fact that the fire box is distributed through a plurality of vertical chambers so that the surface area of the fire box walls is very large and as the exterior of these walls form direct heating surfaces with the air to be heated coming into direct contact with them, a heating surface of a very large area in comparison with the size of the furnace is provided.

The burner on the pipe 13 may be positioned as shown in Figure 1 so that the gas will be ignited thereby forming a combustion chamber at the point 18 which will be directly below the cone 5 and the cone 5 will spread the flames and hot gases equally so that they will pass upward through the channels 16 and then downward through openings 19 in the walls of two of the channels into a box 20 formed between the channels and from the box '20 the gases may escape through a pipe 21 to a stack; It will be noted that the hot gases will pass upward on the interior or around the casing 4 and as this space and also the upper ends of the channels 16 are closed these gases will pass outward and downward through the outer part of the channels 16 and as their only escape is through the box 20 at the stack opening, and also as they will be drawn by the stack draft they will find their way to this point and escape to the stack.

The chamber 3 is enclosedwith a casing having a joint at the front as shown in Figure 3 in which one end of the casing is bent around and under to form a slot 22 into which the other end 23 will slide and the "outer surface of the ends is provided with removed so that the ends will open and these ends may be, opened to the position indicated by the dotted lines 27 so that the inner part of the furnace may be removed through the front of the casing. The lower portion of the casing may be attached to the furnace front 9 by channel shaped clips 28 as shown in Figure 9. The ends of the lower portion fofthecasing which'are indicated by the numerals 29. are provided with. flanges 30 which will be held. in the positionshown in dotted lines in Figure 9 and it will be observed that as a nut 31 on a bolt 32 is tightened it will draw the member 28 downward to the position shown'in full lines and this will draw the end 29 of the casing to the position shown in full lines also so that the casing will be drawn into place and rigidlyheld. I

The ends of the plates forming the walls between the channels 16 and 17 may be made as shown in Figures 7 and 8 in which the 1 and which form the walls box and which is beveled so that it will slope downward at the upper end and up.- ward at I the lower end is provided with flanges 34 the upper edges of which are horizontal as shown so that the upper ends'of the plates which are indicated by the numeral 35 between the channels 16 and 17 may be crimped'over the edges of the flanges 34 as shown. This will make it possible to form a tight joint without cutting and bending the ends of the vertical plates or a bevel.

In the structure shown in Figure 2. the lower portion of the furnace is provided with a forced draft intake duct 36 which opens into a chamber 37 surrounded by a wall 38 which extends upward to the lower end of the channels 16 and 17 so that as air is forced'in through this'duct it will pass upward through the'channels 16 and 17 and also through the openings 6 in the lower end of the chamber 1.. It is understood thatalthough the forced air duct is shown in this manner it may be arranged in any other suitable manner and any other suitable connections may be provided between the duct and the upper portion of-the'furna'ce.

In the structure shown in Figure .4 the channels 16 and 17 are provided with an outer covering 39 which may extend continuously around the channels so that the outer ends of the channels will be closed-thereby forming closed air spaces within the chan-' nels.

In the structure shown in Figure 5 the channels may be divided into two sections with partitions 40 and 41 connecting the innor edges of the channels to the wall 4 of the chamber, 1 so that the fire box will bedivided into two compartments and each compart ment may be provided with a vent as indicated by the numerals 42 and 43, In this design the furnace may be provided with a,

single burner as shown in Figure 1 or with two burners as shown in Figure 5 with each burner under a section of the fire box. It is also understood that the two burners may be used with the structure shown in Figure 1 or with any ofthe other designs as may be desired.

A moisture pan as indicated by the numeral 44 may be provided in the wall of the upper part of the casing as shown in Figi ure 1.

It'will be understood that changes may be v made in the construction without departing from the spirit of the invention. One of which changes may be in the general design or shape of any of the parts, another maybe in the location or arrangement of the stack connection, another may be in the arrangement or general design of the casing, and still another may be in the location or arrangement of the burner. Y

the duct 36 so that it will be forced into The construction will be readily understood from the foregoing description. To I use the device it may be assembled as shown and it will be observed that as the gas is channels and chamber 1. It will therefore be observed that the furnace of the highest pos-' sible efficiency will be obtained as the fire box is limited to a plurality of walls with air contacting the outer surfaces so that the heat will be directly transmitted to the air and the air currents will pass upward with considerable velocity so' that a large quantity of air may be rapidly raised to a very high temperature. It will be observed that. with a furnace of this type there is no grate or fire pot and it would be impossible to install a the pot with this type of construction so that the furnace is only adaptablefor burning gas or the like or for a gas stove. p

Having thusfully described the invention,

what I. claim as new and desire to secureby Letters Patent, is:-" a

inner cylindrical chamber having a conical shaped lower end, an intermediate cylindrical shaped chamber with the portion thereof surrounding the straight portion of the said inner chamber corrugatedby forming the wall thereof in a zig zag form, said intermediate chamber having an opening at the bottom and in one side with an enclosure around the said opening forming a fire box, comparatively large tubes extending from the conical por- Inafurnace ofthe character described, an

tion of the inner chamber through the walls.

of the said intermediate chamber, the aggregate area of the said tubes being substantially equal to the cross section area of the said inner chamber, a jacket surroundi'ng the said intermediate chamber and forming an outer casing to the upper portion of'which connections may be made to convey the heated air therefrom to remote points, a burner positioned directly below the conical portion of the said inner chamber, anda stack connection boxed in between the corrugations of the said intermediate chamber at the lower end of the said corrugations and connecting to the said intermediate chamber through open- 'ings in the walls of the said corrugations. I

V I FRANK E. GRUNWALDT.

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