US2070427A - Heat extractor - Google Patents

Description

Feb. 9, 1937. B R FAUNCE 2,070,427

HEAT EXTRACTOR Filed May 22, 1935 ATTORNEY Patented Feb. 9, 1937 UNITED STATES- PATENT OFFICE HEAT nx'maoron.

Benjamin Rice Faunce, Riverside, N. J.

Application May 22,

6 Claims The object of this invention is to devise a novel heat extractor which can be connected in the discharge pipe line from a heater to recover heat units which would otherwise pass to the chimney.

A further object is to' devise a novel construction of a heat extractor which can be readily cleaned by the user.

With the above and other objects in view as 'will hereinafter more clearly appear my invention comprehends a novel heat extractor.

Other novel features ofconstruction and advantage will hereinafter more clearly appear in the detailed description and the appended claims.

For the purpose of illustrating the invention, I have shown in the accompanying drawing a typical embodiment of it, which, in practice, will give satisfactory and reliable results. It is, however, to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized, and my invention is not limited to the exact arrangement and organization of these instrumentalities, as herein set forth.

Figure 1 is a sectional elevation of a heat extractor embodying my invention.

Figure 2 is an end view of a deflector.

Figure 3 is a section on line 3-3 of Figure 1.

Figure 4 is an end elevation with a connector removed. a

Figure 5 is a detail on an enlarged scale of a deflector.

Figure 6 is a detail of a tube and reducer.

Figure '7 is a plan view of a Working tool.

Similar numerals indicate corresponding parts.

Referring to the drawing:-

l designates the outer shell of a heat extractor embodying my invention. The shell is preferably cylindrical but may have any desired contour in cross section.

The shell is provided at the ends with the heads or closures 2 and 3 which as illustrated are in the form of flanged discs welded or brazed to the shell. The shell I has a cold air inlet 4 and a hot air outlet 5 which latter leads to a desired point of utilization such as for example a hot air register in a room which is to be heated.

The heat extractor is connected to the smoke pipe for the exhaust gases from the furnace or heater by the slip connectors B and I, which are in frictional engagement with the smoke pipe and the shell.

The products of combustion pass through the tubes 8 which pass through the heads 2 and 3 1935, Serial No. 22,735

and have a working fit in them, so that they can be withdrawn for cleaning purposes when desired.

In order to retard the passage of products of combustion through the tubes 8 and increase the amount of heat extracted, I insert in such tubes the deflectors 9 which are in the form of flat copper strips twisted upon themselves to form with the tubes circuitous paths for the passage of the products of combustion.

The hottest portion of the gases will be at the upper portion of the shell, and I therefore provide for graduating the intake of gases to the tubes by providing closures Ill having difierent size openings I l and arranged so that the openings decrease in diameter towards the top of the head 3, for example. These closures are provided with a pin [2 in an ofiset portion which is adapted to enter an aperture l3 at the intake end of a tube. It will thus be apparent that the closures l0 can be readily removed when it is desired to remove the deflectors 9. I also preferably insert between the tubes 8, air deflectors I4 similar to the deflectors 9 and formed of flat twisted copper strips which are reinforced by the rods l5 secured thereto in any desired manner.

I provide a special tool for removing the deflectors 9 from the tubes 8. This tool consists of a tube l6 of greater diameter than a tube 8 and having threaded caps l l at the ends, and having hose connections l8 at the ends. A wire I 9 passes through one cap and is provided with a hook 20 to enter a hole 2| in a deflector 8 so that, when one cap is removed, the deflector 8 can be withdrawn into the tube IS, the cap replaced, and water connections made with the hose connections l8 so that the soot and carbon can be washed down the drain.

I have found in practice, that where a heat extractor embodying my invention is used that, if a temperature of 600 F. is recorded at the inlet end of the extractor, the temperature drops to about 250 F. at the discharge end of the extractor, thus proving that there is a large recovery of heat units which would otherwise be wasted by passing to the chimney.

The heat extractor has a slip connection with the furnace pipe, so that it can be removed and assembled by unskilled labor.

The slip connectors 8 and 1 can be readily removed irom and assembled with the shell, so that the householder can clean the flues of the heat extractor without rendering it necessary to call in a heater repair man.

The air deflectors l4 are inserted between the tubes 8 as the latter are assembled with the heads sorbed by the air. They thus cause a better mixture of the atmosphere and a more uniform heat extraction.

The closures Ill with their graduated openings are detachably connected preferably at the intake ends of the tubes 8, and openings II are selected which will give the best results with the specific stack pull-of the chimney to which the heat extractor is connected.

, The deflectors 9 due to their construction have been found in practice, to be very eflicient in cleaning the tubes when they are drawn out of them.

It will now be apparent that I have devised a new and useful heat extractor which embodies the features of advantage enumerated as desirable in the statement of the invention and the above description, and while I have, in the present instance," shown and described preferrred embodiments thereof which will give in practice satisfactory and reliable results, it is to be understood that these embodiments are susceptible of modification in various particulars without departing from the spirit or scope of the invention or sacrificing any of its advantages.

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

1. In a heat extractor, a shell having a cold air inlet, and a hot air outlet, heads at the ends of the shell, tubes extending through said heads, flat twisted heat absorbing strips in said tubes, closures at one end of the tubes having difierent size openings and means to connect said extractor in the discharge line of a heater.

2. In a heat extractor, a shell having a cold air inlet and a hot air outlet, heads closing the ends of the shell, tubes extending through the heads, closures at one end of the tubes having dlflerent size openings which decrease in diameter towards the top of the head, flat twisted heat absorbing strips in the tubes, heat absorbing members between the tubes, and means to connect the extractor in the discharge pipe line of the heater.

3. In a heat extractor, a shell having a cold air inlet and a hot air outlet, heads closing the ends of the shell, tubes in the shell extending through the heads, means to cause a spiral movement of the gases passing through said tubes, removable closures detachably mounted on one end of predetermined tubes and having different size openings with the smaller openings at the upper portion of the heat extractor and means to connect the extractor in the discharge line from a heater.

4. In a heat extractor; a shell having a cold air inlet and a hot air outlet, heads closing the ends of said shell, tubes arranged one above the other in said shell and communicating through said heads, means to cause a. spiral travel to gases .passing through the tubes, means to graduate from the top to the bottom tubes the intake of gases thereto, and means to connect the heat extractor in the discharge line from the heater.

5. In a heat extractor, a shell having a cold air inlet and a, hot air outlet, heads closing the ends of the shell, superimposed tubes in the shell and communicating through the heads, members having graduated openings removably mounted on the tubes at one end, and connectors at the ends of the shell to connect it in the discharge pipe line of a heater.

6. In a heat extractor, a shell having a cold air inlet, and a hot air outlet, heads closing the ends of the shell, tubes extending through the heads, flat twisted metallic members in the tubes, heat absorbing members between the tubes, means to graduate from top to bottom the pas- ,sage of gases through said tubes, and connectors at the ends of the shell to connect it in the pipe line from a heater.

BENJAMIN RICE FAUNCE.

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