US1465475A - Draft-controlling device - Google Patents

Description

Aug 21, 1923.

F. T. HOPE DRAFT CONTROLLING nsvxcs Filed Dec., 12 1921 IIIII 2 Sheets-Sheet 1 Aug. 21, 1923.

1,465.4 75 F. T. HOPE DRAFT CONTROLLING DEVI CE 2 Sheets-Sheet 2 Filed Dec. 12 1921 1 3 III. 1 5 1 FE t -7 ing this specification. 35

Patented Aug. 21,1923. w

UNI ED,- STATES PAIENT OFFlC E- rnxnnarcx 'r. HOPE, or sna'r'rnn, wasnme'rox, assiexon or ens-emu To ram: Ismum, omi-srxrn 'ro enema a-uaaennn, a m ONE-emu are I. a. cannwmm,

ALL SEAT'BLE, WASHIN GTON.

Y naar'r-coiwnome-"nnvrcn Application filed December 1 The-object'of my invention is primarily to apply a device to the tops of stacks or chimneys to thereby control the. draft in said'stacks and chimneys and to catch the cinders and sparks and prevent their escape in such way as to cause any danger.' the device has been primarily designed for application to the control of escapinggases fromchimneys and stacks, it is evident that it-may be employed for the control of the flow of air-or gases at other places than in chimneys. It is, therefore,- a means for con-v trollin ventilation as well as gases escaping from c imneys. My invention consists of an apparatus which is to be applied to fines carrying air or ases whereb their escape may be contro ed as desire It consists of the peculiar constructions and combinations of parts which will be hereinafter described and then specifically defined vin the claims terminatn the accompanying drawings I have shown my invention embodied in construc tions which differ slightly in details biit in all of which the principles of my invention are embodied. 40 v Figure l is a vertical section through the top of a stack having my invention applied thereto. s

Figure 2 is a similar section showing, however, onl one side of the apparatus and one side of t e stack. 'Figuie 3.is a framentary sectionalview similar to that 0! Figure 2, but showing a slightly different construction. I

igure 4 is a vertical section through the top of the stackand a still further modified type of construction.- n carrying out my invention I apply to the top of the stacks. water holding tank which surrounds thegtack and in connection While 12, 1921. Serial Io. 521,782..

. therewith I mount a hood which covers the discharge end of the stack andhas its outer edges dependin as a petticoat over the tank so as to force e gases to pass between the outer riphery of the stack and the lower depen ing edge of the hood, under the latter and then upward-and outward. The con trol of the area for the escape of the gases 15 secured by varying the level of water contained in t e'tan .If the level of water in the tank be raised to the lower edge of the which-covers thestack, the escape of the gaseswill be prevented. If the level of the waterin the tank be lowered. sufiiciently, the discharge area of the stack beneath the hood is notdecreased'imd there is a free escape assagb for the gases.

-Referring to igure 1, a stack 1 is shown, this bein illustrated as of metal construct'ioni .T e construction of the: stack, whether of 'metal, brick, or concrete, is immaterial.- My inyention may be ap plied to stacks constructed of any type of material and whether round, square, pr an other cross sectional shape. The tank, hood; and otherpartsof myinvention would be modified in construction to conform tothe size and cross sectional shape of the stack. While the device has been shown only as applied to metal stacks, it is evident that it may be applied to chimneys of any type of construction. a

A tank 2 is supported about, the upper :end of the stack. As illustrated this is. shown as earriedby the stack itself through the use of ears or flanges as'20 which cit-i tend over the upper end of the stack. The, manner of supporting this tank is, however, immaterial'and it may be supported independentl of the stack ifthis be found feasible-a'nd is desired. Itais preferred that the tank be placed close to the stack to fthat there be noappreciable draft between: the tank and the stack.

A hood or dome 3 which may be otconical, rounded, or; any: other suitable contour, is placed over the stack and referably so as to cover a'portion orpossib y all of'the tank 2. Thisis shown as supported by means of arms or bars 30 from the -'outer wall of the tank; The manner of support mag; .howeverybe anything found suitable. Y conjunction with this onto:- demo .3 is placed as edema-1oz; etti a and slightly into the tank 2. The tank is 7 40 of this inner. dome preferably extends somewhat below the top edge of the stack also of such width that a sufficient area is left between the bottom edge of the inner dome or pettieoatat 40 and the outer wall of the tank to furnish ample discharge area for the gases.

It is also desirable attimes that a deflecting cone as 5 be placed inside of the .hood. 7 This as shown in Figures 2 and 3 is in the nature of an inverted cone having its center over the center of the stack. It acts to deflect the gases outwardly and then into the space between the petticoat 40 and the stack. In Figure 1 this central deflecting cone has been omitted, the inverted bowlv shaped plate 50 forming an inner lining for the domes 3 and 4. The air spaces between these plates form insulation which results in maintaining the inner dome or lining plate '5 at.such a temperature as will prevent collecting a layer of soot thereon. Without; such heat insulatingconstruction a heavy layer of soot may form thereon which will interfere with the circulation and proper.

working of the device. The tank 2 is supplied with water and" means are also provided whereby the level of this water may be varied. A pipe6 is connected with some source of supply of water under sufficient pressure to cause it to' flow upward and discharge into thetank.

This pipe 6 is preferably placed inside ofthe stack, this being done because usually itmay be so placed more conveniently than otherwise, it being unnecessary to cut any 'holes in the roof of a building to pass the pipe through. Another reason is that a pipe so placed is heated sufficiently by the gases to prevent freezing of the water in cold weather. The pipe 6 enters the bottom of the tank and is preferablyterminated by a bend, as 60, which forms a water seal. The discharge end of this pipe is also preferably placed below the bottom edge 40 of the deflecting petticoat and not higher than the minimum water leve which it may be desired to carry in the tank. It may, however, if desired terminateat the bottom of the tank.

At the lower end of'the stack, at such point as to be easily accessible. is placeda valve 61, preferably a three-way valve, so that when desired water may be discharged from the pipe 6 through pipe 62 and also level.

the draft, if the cohstruction'of t forms an automatic level controlling feature.

Wate is drained from the tank while the device i in use through a pipe 7 which e;- tcnds upward within the tank and is provided with means so that the water. surface mav be varied in elevation. It is also preferably provided with a return bend, as 70. As contemplated in Figure 1 the pipe section 71 is mountedas a sleeve sliding either over or within the lower'pipe section 72. It is carried by a lever 73 or in some other suitable manner, which lever is connected with any suitable means whereby it may be operated from a lower level such, for instance, as chains or wires 74. By such means the pipe section 71 may be raised or lowered and thereby control the surface level of the water in the tank; f

In Figure 2 the v ipe section 71 is shown as connected with t e main body of the pipe 7 through ashort section 75 of flexible hose. The pipe section 71 is suspended upon a leveras 76 pivoted at its outer endW'o the body of the tank and raised and lowered.

through the operation of a 'cord or chain as ,74 which passes overa 'pulley as '77. In

Figure 3 the terminal section 71'of the drainage pipe. is mounted upon the pi e 72 so that it may be swing as upon a inge and its position is -controlled by means of the cords or chains 74, one of which passes over a pulley 8 located towards the bottom of the tank, by means of whichi this pipe section 71 may positively be. pulled downward when it is desired to .lower the water The other cord extends upwardly and both pass over pulleys as 77, mounted over the upper edge of the tank.

Gases passing u the stack 1 will be do flected outward an down by the inner hood 4. The level of waterin thetank will be lower than the lower edge 40 of this hood. The gases being. deflected downward, all cinders and sparks carried thereby will be caused to strike the water in the tank and will be caught and held thereby. The gases will pass upwardoutside of the hood 4 and be discharged. It is contemplated that the dimensions of the hood 4. and the tank 2 will be such as to furnish ample discharge capacity. This should at no time be less than the cross sectional area of the stack itself. If, however, it be desired to choke'the draft this may be" done b raisin water in the tankfthereby ecreasin the cross sectional discharge area beneath the hood t. This action may be carried to any the level of extent desired, even to entire stoppa e of evice be designed for such use.

It is preferred that the outer edge of the tank 2 at its top be' located slightly below the top'of the stack so that in case there be for any reason an overflow of water from the tank over its sides, this will not be disin; a liquid containing tank surrounding the stack just below its upper dist'harge end, a lmml covering the stack discharge and having its lower edge depending above said tank. said hood being composed of a plu-' 'ralitv of plates connected in spaced-apart relation to form a heat insulating cellular 1 ll l(llll'( and means for controlling the gas discharge area beneath the lower edge of the hood.

time during cold 2. A draft controller for stacks comprising a liquid containing tank surrounding the stack just below its upper discharge end and a hood covering the stack discharge and having its lower edge depending above said tank, said hood being composed of a plurality of plates connected in spaced-apart relation to form a heat insulating cellular structu1'e,'ai1d means for supplying water to and dischargin; it from said tank.

, .3. A draft controller for stacks comprising a water tank 'surroundin; the stack. an

inverted hood covering the stack and ha\ in: g u l n its edges depending into the tank. said hood belng composed of separated plates secured together to. enclose heat insulatine air layers between them, and water supply and discharge pipesfor the tank, the latter pipe driving a vertically fldPlSttiblG intake.

Signed at Seattle, (ing County. \Vashington, thi s 6th day of December, 1921.

i FREDERICK T. HOPE.

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