US1966946A - Draft stabilizer for stove flue pipes - Google Patents

Description

JuHy 17, 1934.

E. v. COULSTON l9966,5346

DRAFT STABILIZER FOR STOVE FLUE PIPES Filed Feb. 18, 1932 W "5 k EXCESS me 14 WASTE 4 #1 i Peooucra AWBWOQ: 1 76; 2 [21,04 L/ (001570 5y M QMJ Patented July 17, 1934 UNITED STATES ATENT FFHCE DRAFT STABILIZER FOR STOVE FLUE PIPES 7 Claims.

My invention particularly relates to draft stabilizers which automatically control the draft through the flue pipes of stoves, which prevent variations of chimney draft from afiecting the stove connected to the chimney, which insure a safe and sure lighting and starting of stoves when atmospheric conditions have temporarily blanketed and stopped the chimney draft, and which effect the desired draft control without at any time shutting off the full free passage of the stoves waste products to the chimney. My improved stabilizer can be made at low cost and readily installed on any stove without the use of special tools. Although my invention is adaptable for use with stoves burning all types of fuel, it is particularly adapted for use with stoves burning gas or similar fuel.

Gas burning stoves when set up for operation should be connected by means of flue pipes to a chimney which will discharge the waste products outside of the building. In fact, such method of operation is required by ordinance in most municipalities. The use of these fines and chimneys requires a waste product and air conducting system which is very sensitive to atmospheric and other changes. Hot and muggy outdoors weather, cold and snappy outside weather, strength and direction of Winds, all affect the stove operation, when exposed to these different weather conditions through the medium of the connecting pipes and chimneys. Thus the same stove with the same burner flame operates quite difierently and gives widely differing results at different times. My invention is designed to equalize these different conditions and stabilize the stove operation.

The annexed drawing and the following description set forth in detail certain means embodying my invention, such disclosed means constituting, however, only one of the various forms to which the principle of the invention may be embodied.

In said annexed drawing:

Figure 1 is a partial plan view and a partial plan section of my improved stabilizer, taken in the planes indicated by the line 11, Figure 2; and

Figure 2 is a central vertical section of the stabilizer incorporated within and between adjacent sections of a stove flue pipe, fragmentary portions of which are shown in the view, the plane of the section being indicated by the line 2--2, Figure 1.

Referring to the annexed drawing in which the same parts are indicated by the same respective numbers in the several views, the stabilizer comprises a lower ring section 1 which forms a central circular inlet opening for waste products from the stove, which are conducted thereto through the stove pipe 2 upon the upper end of which the ring 1 is mounted with a snug fit, the ring 1 having an inside annular flange 3 forming a stop for the pipe 2 when it has entered to its proper position. The ring 1 is connected to a larger and concentric ring 6 by means of an annular series of spaced ribs 4 which are connected to, and extend upwardly and outwardly from, the ring 1, so that there is formed an annular series of spaced openings 5 through the body of the stabilizer shell member formed by the rings 1 and 6, these openings 5 communicating with the atmosphere outside of the stove pipe 2. The ring 1, ribs 4, and ring 6 may be separate members suitably secured together or any two of them may be integrally formed, but I prefer to form all three members as one integral body.

The stabilizer further includes an upper shell 7 which is a dome-like member erected upon the lower shell ring 6 and forming a continuous body therewith, this dome-like shell having an upper annular flange 8, preferably of substantially the shape and size of the lower ring 1, and forming an outlet opening from the stabilizer opposite the lower inlet, this flange 8 being adapted to be inserted within the lower end of a flue pipe section 9.

Between the inlet and outlet of the stabilizer and spaced from the wall thereof so as to form an annular continuous passage adjacent said wall is a draft-baffling member 10 of substantially the shape and area of the inlet opening through the lower ring 1. This member 10 may be suitably supported in any desired manner but, as shown in the accompanying drawing, depends from the flange 8 of the upper domelike shell by means of spaced ribs 11 integrally formed with the flange 8 and member 10, the

upper and lower shells being connected together by bolts 13 which are passed through the draftbaffling member 10 and inwardly-extended lugs 14 formed integrally with the flange 3 of the lower ring 1. The draft-baffling member 10 is centrally located relatively to the Wall of the stabilizer and so spaced from the Wall thereof as to provide an annular draft passage 12 around the baffling member of an area at least as great as the area of the inlet opening through the ring 1. The openings 5 through the lower stabilizer Y shell communicate with the annular draft passage l2 and are substantially longitudinally aligned therewith. The draft-baflling member 10 may be formed, and is so shown in the accompanying drawing, with a central opening 15 which serves as an inspirator, in the manner and for the purpose hereinafter fully described.

When installing the above-described stabilizer, it is necessary only to slip the lower ring 1 over the top end of the first joint of stove pipe leading from a stove and then to slip the bottom end of the second stove pipe joint over the flange 8 of the upper stabilizer shell. Therefore no tools are required in the installation of the device, and any one can install it with very little inconvenience.

In order to describe the operation of the stabilizer, it may be stated that when a stove is set up and operated without any flue connection, and its waste products simply flow out of the upper stove opening, the stove will operate properly and satisfactorily, if the disposition of the waste products is disregarded. Under these conditions the stove will always operate at the same draft rate, which does not vary because it is not subject to outside influences. This may be called a normal draft rate and is the rate at which the stove should operate for uniform results and highest efficiency. My invention causes the stove to so operate at all times even when subject to the conditions incident to flue and chimney connection, as will now be described.

If the weather conditions are such as to cause a strong draft with a rapid rate of draft speed, its effect is prevented from extending down into the stove by reason of the interposed baflieplate 10. Diverted by the baffle plate 10, the strong draft exerts itself on the annular passage 12 and is thus brought in line with the openings 5 to the atmosphere outside of the lower flue pipe. Thus air is drawn into the stabilizer from the room and is pulled up the chimney. Meanwhile the normal draft of the stove delivers. waste products below the bafile member 10, and these products spread out under the bafiie member 10 to the edge of the latter and reach the draft passage 12. Here theyjare caughtup by the chimney action. Inasmuch as these waste products are hot, they arefirst to flow up around the baffle plate 10 and to the chimney above, to the exclusion of that much room air through the openings 5. The combined air supply'through the openings 5 and the waste products always balance the chimney demand.

' If the weather conditions are such that there is no chimney pull or even a slightly descending current and which with a stove as ordinarily connected to a pipe might require a relighting two orthree times before the stove burns properly, then the descending current is stopped by the baffle plate 10 from affecting the stove below. This current spreads to the sides of the baflie plate 10, and flows down through the annular passage 12 and out into the room through the openings 5. At the same time the'stove by its normal draft delivers the hot waste products under the baflle plate 10 whence they spread to the sides thereof and for a few moments may to an extent be entrained by the down draft and also flow outinto the room through the openings 5. But the stove continues to burn freely, the flame not being blanketed and extinguished by the descending current of air, so that in a few moments the heat of the waste products start the draft movement upward above the baflie plate 10 and through the chimney. By means of the inspirator opening 15 shown and described, this reversal of draft movement may be accelerated.

In neither of the opposite extremes above described does the chimney draft exert any undue action on the stove itself. The chimney acts only on what is delivered to the annular passage 12 at the edge of the baflle plate 10. It is evident that the same action in varying degrees takes place incident to the many graduated conditions between the described extremes. Also incident to these operations, is the diverting of any back draft occurring for a few minutes from a wind puff, without affecting the stove burner, and the impossibility of any extra strong chimney draft whipping heat through and out of the stove oven faster than the normal rate of operation produces heat. Also, no adverse draft can have any smothering effect upon the stove burners.

I direct particular attention to the fact that my stabilizer acts automatically and requires no regulation, that it has no moving parts which would wear and require attention, that it is noiseless, and that at all times it provides a full free passage for all of the products of combustion from the stove to the chimney.

What I claim is:

1.. A draft stabilizer for stove flue. pipes comprising a cylindrical shell in two sections, one of which is formed with an inlet opening and the other with an outlet opening, a draftbaffling member within and spaced from the wall of the shell to form a tortuous continuous draft passage around the baffling member from the inlet to the outlet, said draft-bafiling member being integrally formed with one of the shell sections, the shell being formed with an annular series of openings surrounding the inlet opening and communicating with said draft passage, and said draft-baffling member being formed with an inspirator opening therethrough.

2. A draft stabilizer for stove flue pipes comprising a lower. shell having concentric cylindrical sections integrally connected by an annular series of ribs so as to form a series of openings between the sections, the inner shell section being formed with an inlet opening, an uppercylindrical shell erected on the outer section of the lower shell and having an outlet opening, and a draft-baffling member integrally formed with the upper shell andrigidly secured to the lower shell and interposed between the inlet and outlet and spaced from the shell walls to form a draft passage around said member from the inlet to the outlet, said draft passage communicating with said series of openings.

3. A draft stabilizer for stove flue pipes comprising a lower shell having concentric cylindrical sections integrally connected by an annular series of ribs so as to form a series-of openings between the sections, the inner shell section being formed with an inlet opening, an upper cylindrical shell erected on the outer section of the lower shell and having an-outlet opening, and a draft-baffling member integrally formed with the upper shell and rigidly secured to the lower shell and interposed between the inlet and outlet and spaced from the shell walls to form a draft passage around said member from the inlet to the outlet, said draft passage communicating with said series of openings, and said draft-baffling member being formed with an inspirator opening therethrough.

4. A draft stabilizer for stove flue pipes comprising a lower shell having concentric cylindrical sections integrally connected by an annular series of ribs so as to form a series of openings between the sections, the inner shell section having a depending flange adapted to telescope with a flue section, an upper cylindrical shell erected on the outer section of the lower sheil and having an upwardly-extended flange of substantially the same diameter as said depending flange and adapted to telescope with a flue section, said shells being rigidly secured. together, said shells having, respectively, inlet and out-let openings communicating with the interiors of said flanges, and a draft-baiiiing member supported by said shells between the inlet and outlet and spaced within and from the stabilizer wall to form a draft passage around said member from the inlet to the outlet, said draft passage communicating with said series of openings between the ribs, and said draft-hauling member being formed with an inspirator opening therethrough.

5. A draft stabilizer for stove flue pipes comprising a lower shell having a central annular ring member forming a circular inlet, said ring having a depending flange adapted to telescope with a flue section, an annular series of outwardly-extended spaced ribs integrally formed with said ring, and an outer ring to which the outer ends of said ribs are integrally joined, an upper dome-shaped shell erected on said outer ring and having a central outlet opening opposite said inlet, said upper shell having an upwardly-extended flange of substantially the same diameter as said depending flange and adapted to telescope with a flue section, and a draft-baiiiing member integrally formed with one shell and rigidly secured to the other shell and mounted within and symmetrically relative to the shell walls and spaced from said walls to form a tortuous draft passage from the inlet to the outlet, said draft passage communicating with the spaces between said ribs.

6. A draft stabilizer for stove flue pipes comprising a lower shell having a central annular ring member forming a circular inlet, an annular series of outwardly-extended spaced ribs integrally formed with said ring, and an outer ring to which the outer ends of said ribs are integraliy joined, an upper dome-shaped shell erected on said outer ring and having a central outlet opening opposite said inlet, and a draft-bailing member integrally formed with one shell and rigidly secured to the other shell and mounted within and symmetricaly relative to the shell walls and spaced from said walls to form a tortuous draft passage from the inlet to the outlet, said draft passage communicating with the spaces between said ribs, and said draftbaifiing member being formed with a central inspirator opening therethrough.

7. A draft stabilizer for stove flue pipes comprising a lower shell having inner and outer sec tions integrally connected by a series of spaced ribs so as to form a series of openings between the sections, the inner shell section being formed with an inlet opening, an upper shell erected on the outer section of the lower shell and having an outlet opening, and a draft-baffling member integrally formed with one of the shells and rigidly secured to the other shell and interposed between the inlet and outlet and spaced from the shell walls to form a draft passage around said member from the inlet to the outlet, said draft passage communicating with said series of openings.

EARL V. COULSTON.

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