US2137693A - Heating furnace - Google Patents

Description

Nov. 22, 1938.

&51

E. LUNDT 2,137,693

HEATING FURNACE I Filed Feb. 11, 1938 4 Sheets-Sheet 1 a 55 BID {0 12 g k as 59 8 kts.

WITNESSES INVENTOR frames? 0 L 1471,6117

Ma-LMMW ATTORNEYS Nov. 22, 1938. E. C. LUNDT HEATING FURNACE Filed Feb. 11, 1938 4 Sheets-Sheet 2 INVENTOR I ErneefC.Lun'cZZ WITNESSES A'ITORNEYS Nov. 22, 1938. E. c. LUNDT HEATING FURNACE Filed Feb. 11, 1958 4 Sheets-Sheet 5 INVENTOR Ernesi'C Lundt BY M Ma- W ATTORNEYS WI NESSES Nov. 22, 1938. Q LUNDT 2,137,693

HEATING FURNACE Filed Feb. 11, 1938 4 Sheets-Sheet 4 wnwzsscs U INVENTOR Z'rnest C. L and? ATTORN EYS Patented Nov. 22, 1938 UNITED STATES HEATING FURNACE Ernest o. Lundt, Bloomfield, N. 1., winner, by memo assignments, to American Radiator Company, New York, N. Y., a corporation of New Jersey Application February 11, 1938, Serial No. 189,929

8 Claims.

This invention relates to heating furnaces, and particularly to an improved gas heated furnace which may be used for melting metal or other desired material, the object being to provide a construction which will utilize substantially all of the heat created.

Another object of the invention is to provide a heating furnace wherein the heating members are arranged within a pot and the exhaust from the heating members is used to heat the side and bottom of the pot.

A further object of the invention is to provide a heating furnace wherein means are presented for applying a preponderance of the heat to certain specified zones both within and without a pot forming part of the furnace.

In the accompanying drawings:

Fig. 1 is a sectional view through Fig. 4 approximately on the line l-l;

Fig. 2 is a sectional view through a suction device embodying certain features of the invention;

Fig; 3 is a sectional view through an inspirator and associated devices presenting certain features of the invention;

Fig. 4 is a top plan View of a complete heating furnace embodying the invention;

Fig. 5 is a sectional view through Fig. 4 approximately on the line 55, the same being on a slightly reduced scale;

Fig. 6 is a top plan view of the container or pot shown in Fig. 5;

Fig. 7 is a side view of the pot shown in Fig. 6;

Fig. 8 is a view similar to Fig. 7 but showing the opposite side of the pot.

Referring to the accompanying drawings by numerals, i indicates a pot and 2 a casing which is preferably provided with a metal lining 3 and suitable heat insulating material 4 so as to hold or retain the heat against radiation. The pot i is provided with a radiating flange 5 which preferably rests on casing 2 and which may be secured to the casing if desired. The pot l is shown in detail in Figs. 6, 7 and 8. From these figures it will beseen that the pot l is provided with a body 6 having the flange 5 integrally formed therewith and also a number of side webs I and bottom webs 3. The side webs l are arranged vertically when the device is in use and the horizontal webs 8 are arranged in a horizontal position on the bottom of the pot. It will also be noted that the bottom edges of all of the webs are in the same horizontal plane so that they all may rest on the bottom section of lining3 while the flange 5 rests on the upper edge of easing 2. It will be noted that the webs l are of diilerent heights so as to provide a tortuous passageway which coacts with the tortuous passageway provided by the various webs 8 on the bottom. As shown in the accompanying drawings there have been provided four independent tortuous passageways, but ii desired the device could be made with two or even one without departing from the spirit of the invention.

As shown in Fig. 1 the various heating pipes 9 are arranged so that their discharge ends will discharge into the various passageways II! which in turn discharge into the inlets of the various tortuous passageways ll. These pipes as shown in Fig. 5 extend to a point above the flange 5 so that they may be readily removed after the clamps or supporting saddle 38 and the retaining bolts 9' (Fig. 4) have been removed. It will be understood that the outlet end of each of the pipes 9 discharges into an independent passageway l and consequently into an independent tortuous passageway II. From Fig. 1 it will be noted that there is a lining i2 for the passageway I II which is protected by an outer shield I3 so that the products of combustion from the respective pipes 9 will lose little or none of their heat units before they discharge into the desired tortuous passageway. As indicated in Fig. there are four tortuous passagewaysjnamely. passageways I, I5, i6 and i1. These passageways lead from the various inlet openings H, l5, l6 and IT to the various outlet openings l3, I9, 29 and 2 l. The openings I 8 and I9 discharge into the outlet or exhaust pipe 22 and the openings 29 and 2| discharge into the outlet or exhaust pipe 23. Associated with each of the outlets 22 and 23 is a damper 24 which may be of any desired kind and which may be operated from an outside lever 25 so as to vary the inlet part of the members 22 and 23. It will therefore be seen particularly from Fig. 1 of the drawings that the exhaust enters the tortuous passageways on one side of the pot and leaves the tortuous passageways on the opposite side.

A suction device 2! is connected with each of the exhaust pipes 22 and 23 so as to provide suction to relieve or eliminate back pressure in the various tortuous passageways as well as in the pipes 3. This suction device may be of any desired kind, but as shown it consists of a discharge nozzle 2'! merging into a casing 28 forming a suction chamber 29. An air nozzle 30 is arranged\ in chamber 29 and is supplied with air under pressure from any suitable source whereby as the air is discharged into the nozzle 2'! rarefaction will be produced inchamber 29 and the gravity closed flap valve 3| will be opened. If there is no combustible mixture being fed into the pipes 9 the action of the suction device will draw air into the pipes 9 and also into the various tortuous passageways so as to clean them of previous products of combustion. However, ordinarily the inspirator 32 is used for directing a combustible mixture into each of the pipe: 9. It will be understood that there is an inspiratcr 32 for each pipe and that the various inspirators direct the combustible mixture into the inlet end of the pipes 3. The inspirator supplies a mixture of air and gas and as this air and gas is supplied in pipe 3 it will draw in secondary air through the shutter 33 whereby a proper mixture is provided for the heating pipes 9 which really form what are known as closed combustion chambers, although they are open at both ends.

As shown in Fig. 4 the various pipes 3 are arranged into what may be called groups 34 and 35. These groups 34 and 35 are arranged immediately above the respective zones or areas 38 and 31 of the pot i. All of the passageways act to permit heat to be applied to the areas 38 and 31 exteriorly of the bottom of the pot or container l. The groups 34 and 35 also apply heat to zones or areas immediately above the zones or areas 38 and 31. From Figs. 1 and 5 it will be observed that all of the pipes 9 are spaced from the pot I and that the larger parts of the various pipes form groups 34 and 35 arranged in a horizontal plane a short distance above the bottom of the pot or container I. In order to prevent any rising movement of the pipes 3 when the device is in use, there is provided a retaining bracket 33 for each group of pipes. These retaining brackets are secured by screws or other wise to flange 5 and by suitable clips 33 to the respective pipes.

It will be seen that each pipe receives an ignited supply of combustible mixture at its inlet end when the device is in use and combustion takes place within the respective pipes so that the products of combustion while hot will be discharged out through passageway Ill into one .of the tortuous passageways. The various tortuous passageways are arranged as shown in Figs. 4 and 6 so that all parts of the side walls and bottom of the pot will be heated and zones 33 and 31 will receive more heat units than any one part. This arrangement with the position of the groups 34 and 35 presents adjacent hot zones which will maintain the metal or other substance fully heated. Also by heating all parts of the pot the temperature throughout the material carried. by the pot will be approximately the same.

I claim:

1. A heating furnace comprising a container having a plurality -of spaced webs on the outer surface of the side walls and the bottom, a casing for said container coacting with said webs for forming a plurality of tortuous passageways, a plurality of heating pipes positioned in said container and located so that the outlet end will discharge into the inlet end of said tortuous passageways, means for directing an ignited combustible mixture into the inlet end of said heating pipes, and means at the outlet end of said tortuous passageways for producing a suction.

2. A heating furnace comprising a metallic container having a plurality of spaced webs integral with the container and positioned to extend outwardly from the outer surface of the sides and bottom of the container, means coacting with said webs for forming a tortuous passageway, a heating pipe positioned in said container and spaced from the walls thereof, said pipe being arranged so that the outlet end thereof will discharge into the inlet end of said tortuous passageway, means for discharging a combustible mixture into the inlet end of said pipe, and means for producing a suction in the outlet end of said tortuous passageway.

3. A heating furnace comprising a pot having webs on its outer surface, a heat insulating casing surrounding said pot and coacting with the webs and body of the pot to form a plurality of tortuous passageways, a heating pipe with the" principal part located within said pot for each of said passageways, each of said pipes having the outlet end connected to the inlet end of one of said tortuous passageways, means at the inlet end of each of said pipes for discharging a combustible mixture therein, and suction means at the outlet end of each of said tortuous passageways for removing back pressure to the incoming combustible mixture.

4. A heating furnace comprising a cast metal pot formed with a body having an integral radiating flange at the top, vertically arranged spaced webs on the sides and horizontally extending webs on the bottom, a casing coacting with said body and all of said webs for forming a plurality of tortuous passageways, a heating pipe for each of said passageways, said heating pipes at their discharge ends discharging into the inlet ends of said tortuous passageways, means at the inlet ends of said pipes for discharging a combustible mixture into said pipes, and suction means at the outlet end of each of said tortuous passageways acting to remove back pressure in said pipes. 5. In a heating furnace a pot having a body formed with a radiating flange at the top, a plurality of spaced vertically positioned webs on the sides and a plurality of horizontally positioned webs on the bottom, the bottom of said horizontal webs and said side webs being in a horizontal plane.

6. A heating furnace including a pot having a plurality of upstanding webs on the sides and bottom, and a casing enclosing the sides and bottom of said pot acting in conjunction with the body and webs of the pot to present tortuous hot gas carrying passageways grouped to apply a preponderance of heat units to adjacent areas of the bottom of said pot, and removable heating pipes arranged within said pot whereby the pot is heated from without by one heating element and heated from within by a different heating element.

'7. A heating furnace comprising, a pot formed on its outer surface with spaced vertical webs on the sides and spaced horizontal webs on the bottom, a casing covering the sides and bottom of said pot including said webs, said casing and pot with its webs forming tortuous hot gas carrying passageways grouped to apply a preponderance of heat units to adjacent zones of the bottom of said pot, a plurality of groups of heating pipes positioned in said pot, said groups of heating pipes being positioned to apply a preponderance of heat units to areas immediately above said zones, and means for directing a heating medium into said pipes.

8. A heating furnace comprising a pot, a series of heating pipes using a combustible mixture, said pipes being arranged within said pot but spaced therefrom, and means utilizing the exhaust from said pipes for heating from the outside the bottom and side walls of said pot.

ERNEST c. p m.

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