US2002020A - Heat retarder - Google Patents

Description

May 21, 1935. M J, Q NYBORG 2,002,020

HEAT RETARDER Filed Dec. 3, 1954 Patented May 21, 1935 HEAT RETARDER Marinas J. C. Nyborg, Columbia Heights, Minn,

assignor of two-fifths to neapolis, Minn. I d p F. H. Hosmer, Min- Application December 3, 1934, Serial No. 755,775

2 Claims. (01. 257-168) 1 My invention provides an improved auxiliary heater or fuel saveradapted to beinterposed in the smoke pipe between a furnace and'the chimney or hue; and generally stated, theinvention consists of the novel devices, combinations of devices and arrangement of, parts hereinafter described and defined in the claims. The device is preferably made from sheet' metal andcomprises inner and outer casingsspac'ed to afford an air-heating chamber surrounding the inner casing, combined with inlet and outlet passages and baflles, all as willhereinafter more fully appear. I

In the accompanying drawings, which illustrate a commercialform of the invention, like characters indicate like parts throughout the several views.

Referring to the drawings: Fig. 1 is a perspective showing the auxiliary heater, some parts being broken away;

Fig. 2 is a vertical section taken on the line 2-2 of Fig. 1; and

Fig. 3 is a vertical section taken on the line 3-3 of Fig. 1.

Preferably, both the outer and the inner cas ings or sheet metal shells are rectangular. The outer casing is indicated by the numeral 4 and the inner casing or shell by the numeral 5, said parts being spaced to afford an air-heating chamber 6 that extends around all four sides, under the bottom and over the top of the inner shell. The numeral 1 indicates the smoke pipe leading from the furnace and the" numeral 8 the smoke pipe leading to the outlet flue or chimney. A short pipe section 9 is rigidly connected to the lower portion of the inner shell and to the outer shell 4 and projects from the latter so that the smoke pipe 1 is telescoped onto the projecting end thereof and is rigidly but detachably clamped side, the inner shell 5 is provided with a short pipe section I2 that is secured thereto and to the outer shell, preferably in alignment with the pipe section 9. This pipe section l2 projects from the outer shell so that the smoke pipe 8 is telescoped onto the same and is clamped thereto by a split collar l3 provided at its ends with a nut-equipped clamping bolt M. An air intake pipe I5 is connected to the bottom of the outer shell and opens into the bottom of the air-heating chamber 6. This connection, as shown, is made by a thimble I6 and a clamping collar H, which latter at its ends is provided with a nutequipped bolt l8. A hot air delivery pipe I9 is thereto by a split clamping collar l0 equipped connected tothe top of the outer shell and opens from the top of the chamberG. This connection, as shown, is made by providing the topof the shell 4, .with a flange that is telescoped into the lower end of the pipe l9 and by a split collar ,2l,fprovi'ded at its ends with a nut-equipped bolt 22. d d d V Within the inner shell 5 are vertically overlapping-bafileplates .23, 24 and 25. The bafile 24 extends fromthe top of the shell 5, downward between, the upwardly extendedbafiles 23 and 25 so as to form a tortuous air passage for the'products of combustion through the said inner shell. As shown in Fig. 3, small tie brackets 26 connect the sides of the shells land 5.

Preferably, both the outer and inner shells are provided with hinged bottom plates which, when opened, afford access to the interiors thereof for the purpose of cleaning or repair. As shown in Fig. 3, the outer shell 4, is provided with a hinged bottom plate 4a and the inner shell 5 is provided witha hinged bottom plate 5a. The above noted connection between the air intake pipe l5 and the bottom of the outer shell is therefore made directly to the hinged bottom plate 4a and must be disconnected therefrom before'the said bottom plate can be dropped to a position shown by dotted lines in Fig. 3. To normally hold the bottom plate 4a in closed position as shownby full lines in the various views, it is shown as provided with a sort of turn button 21, the hooked upper end of which is engageable with a detent 28 on the interior of the adjacent wall of the outer shell; and in like manner the bottom plate 5a is I provided with a turn button 29, the hooked upper end of which is engageable with a detent 30 on the interior of the adjacent wall of said inner shell. a

The numeral 3|, see Fig. 2, shows a hinged damper located on the wall of the inner shell, preferably just above the pipe section l2. This damper will be normally closed as shown by full lines in Fig. 2, but is adapted to be moved into its open position indicated by dotted lines in said view, under the action of a thermostat such as a sylphon bulb 32, shown as anchored to the pipe section 12 and connected to said damper by a short link 33.

The air intake tube l5 may extend from the outside of the room or building for the intake of fresh air or it may be a return pipe from one of the rooms. The warm air discharge pipe ill not shown, but the smoke pipe 1 will extend from the outlet thereof.

From the foregoing and from inspectionof the drawings, it is obvious that the cross-sectional conducting capacity of the tortuous passage through the inner shell is much greater than that of the smoke pipes I, 8, 9 and I2, so that it follows that the hot products of combustion from the furnace will move "very slowly through the said inner shell and 'Will have plenty of time to give up or radiate the heat that would otherwise be carried into the flue or smoke stack and hence wasted. Of course, the arrangement of baffles :makes a long travel for the heated gases through the inner shell. Also the flow of air through the champer 6 will be very slow so that it have time to absorb all of the heat radiated from the inner shell.

If the air in the chamber 6 becomes heated be yond a predetermined extent depending 'on the setting of the thermostat, damper 3.| will be opened .so that under .the strong draft from the flue, some overheated air will be drawn .into the interior of the inner shell and carried to the chimney .or flue tl'lrough the .pipe 8. This will prevent overheating or burning of the air delivered into the room. Obviously, all of the heat that is absorbed .or taken up by this auidliary heater will :be saved heat, that is, the auxiliaryheater operates on heat that would otherwise be carried into the :chimney and wasted. It will be understoodthat the device described as to details of combustion to take a tortuous course therethnough, said inner and outer shells having hinged bottom plates affording access to the interiors thereof when dropped, said air inlet pipe being detachalbly connected to and delivering throughthe "hinged bottom of said outer shell.

.2, .An auxiliary heater comprising inner and outer shells spaced to afford an air chamber, said outer shell having air intake and outlet pipes and said inner shell having smoke pipe connections leading thereto and therefrom through the walls of gsaidoutershelL-said inner shell having overlapping bafiles for causing the products of com- :bustion to take a tortuous course therethrough, in-which saidstructure, the inner shell is provided withan peningnormally closed by damper combined with a thermostat arranged to movesaid damper to an open position when the air in the .air chamber is heated beyond a predetermined temperature. p

MARI-NUS J. C. NYBORG.

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