US1454560A - Chimney draft device with two fans - Google Patents

Description

May a, 1923.

E. PRAT CHIMNEY DRAFT'DEVICE WITH TWO FANS Filed April 27. 1921 EMILE raa'nor PARIS, raanon, Assrenoia T0 soonirn DES A. TIRAGE rnnurr, or rears, raanon.

Farr i Q,

onnnrnnns Louis PRA'I.

CHIMNEY DRAFT DEVICE WITH TWO FANS.

Application filed April 27, 1921'. Serial No. 464,950.

To all whom it may concern:

Be it known that I, EMILE of the Republic of France, residing atParis, France, 64: Rue de Miromesnil, have invented certain new. and useful Improvements in Chimney Draft Devices with Two Fans, of which the following is a specification.

My invent-ion relates to induced draft devices of the type described in my pending application Serial No. 370,860 filed April 2nd. 1920, in which a fan is arrangedwholly PHAT, a citizen inside the chimney and is stream-lined, i. e.

has theouter form of-a body of least resistance to the flow of gases passing round it. In important draft plants it is further known to employ two fans instead of one, in particular in order to have a spare fan or a second fan available when the action of one fan is to be reinforced. Insuch case, according to my present invention, the lower part of the two fans is terminated by a curved plate forming a hood which gives the casing of the set of two fans the stream-lined form or form of a body of least resistance to the flow of gases deflected by said hood.

My invention further permits tion of the orifice of thetwo fans by means of a movable ring inside the outlet nozzle common to the two fans,- said ring being adapted either to prolong the nozzle or to allow the passage of the gases both inside the ring and between the latter and the nozzle.

A further feature of the invention is that the partition common to the discharge ducts of the two fans is made movable so as to control the connecting of the fans in parallel or the shutting of either fan.

In the appended drawing which shows schematically two embodiments of the invention. Figure 1 is a sectional elevation of a chimney having two inner fans; Figure 2 is a sectional elevation at right angles to Figure 1; Figure 3 is a sectional elevation showing details of the ring and the regulating movable partition or shutter; Figure 4 is a similar view of a modified form of the arrangement when the two fans'are placed in two different planes instead of being in the same plane as in Figure 1; Figure 5 is a see tional elevation at right angles to that of Figure 4:.

Referring first to Figures 1 and 2, the two fans a a, are located inside the chimney on a common median plane, their discharge ducts 0 0 opening into a nozzle (1 common to both,

the regula- The casing of the two fans is surrounded, at its lower part, with a curved plate 6 forming a hood which gives the set of two fans the form designated in aeronautics as the stream lined form or body of least resistance to the iiow of gases.

The gases are deflected by said plate to both sides of the set of fans and flow up the chimney with the smallest possible loss of pressure. i

The regulation of the gas delivery ofthe two fans is effected by means of a movable conical ring f shown in Figures 3, i and 5, which is provided with any suitable device enabling it to be raised and lowered.

When said ring is in the position shown in full lines, the two fans discharge the fluid in parallel on a total area corresponding to the upper opening of nozzle (Z. On the contrary, when one of the fans is stopped the.

ring is raised to the position f shown 'indot and stroke lines; the fan that remains in operation discharges on an orifice corresponding to the upper opening of said ring. In the intermediary positions of the ring, the two fans discharge on'a total orifice corresponding to an area intermediate the upper openings of ring f and nozzle d. I i

It is known that the sett-ing'of fans in parallel is extremely difficult,'as surging between them occurs when they work on a nozzle common to both. In order to avoid this inconvenience the discharge ducts 0 c, of the two fans-have a common partition formed by shutter g (Figure 3) for instance, adapt- 7 about a hinge 72,. According to requir'ements, to obtain regulation, the shuted to rock ter 9 is inclined either to right or to left hand. The end positions 9 or g, of the shutter correspond to stopping of either fan.

In the modified form of Figures i and 5, the shutter g, is in a plane perpendicular to the shutter of Figure 3. The discharge ducts c, and a, of the two fans are adjacenteach other instead of being opposite while" the nozzle (5 and ring f. are the same as in Fig. 3. The regulating ring and movable shutter of Figures 3. 4t and 5 can also be applied to I fans placed outside a chimney and blowing atmospheric air into the latter.

What I claim is:

1. In combination, a chimney and a draft device associated with said chimney, said draft devicecomprising a plurality of fans having separate inlets arranged side by side.

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2. In combination, a chimney, and a draft device associated with said chimney, said draft dev ce comprising a plurality of fans arranged; side by si'de and wholly within mit passage of a portion of the combustion gases and adapted to work in parallel and a single curved deflecting plate common to the two fans to form a stream line tothe respective fan inlets.

v .4." In'combination, a chimney, and a'draft -device" associated with said chimney, said draft device comprising a plurality of fans having separate inlets and arranged wholly I .lIlSlCle otsaid chimney and being spaced "therefrom to permit passage of a portion of fthecombustion gases and adapted to work in parallel and a single substantial U-shaped deflecting plateeommon to the several fans 'and"arranged at the ends of the latter pre sentedto the oncoming stream of combustion 'gases.

In combination, a chimney, and a draft device associated with said chimney, said draft device comprising a plurality of fans arranged side by side and each having a separate inlet,"and a curved hood partially enveloping the portions of the several we Cal ings 'presented to the flow of combustion "gases to form a stream line to the respective fan inlets.

6. In combination, a chimney, and a draft to draw'in parallel a'portion only of the combustion gases passing through the chimney, a discharge duct on each fan, a single nozzle common to both discharge ducts, and means for causing said fans to work in parallel, 'saidmeans comprising a partition adapted to occupy a variable position between the two ducts to vary the ratio of the passage area. of said ducts.

7:111 combination, a chimney, a*'draft device associated with said chimney, said draft device comprising twofans adapted to draw together apor ion only of the combustion gases passing through the chimney,

said fans being arranged wholly inside the chimney, and the remainder of the gases passing outside ofthefans directlyupthe chimney, a dischargeduct' foreach fan, a

nozzle common to the discharge ducts of both fans for inducing the draft of said remainder of gases, and a mova-ble partition between said discharge ducts for varying the ratio of the outlet areas of'said ducts", said partition being adapted to he "placed in variable positions between total opening and closing oi either duct.

8 In combination, a chimney, and a chimney draft devicegsaid draftdei' ice comprising two fans adapted to'di'aw together only aportion ofthe combustion gases passing through the chimney said fans being arranged wholly in sidethe chimney andthe remainder of said gases passing outside the fans directly up the chimney, a discharge duct for each fan, anoz'zle common to the discharire ducts of both tans for inducing; the draft. of said remainder of the gases, a movable partition"between the discharge ducts for varying the ratio'of'the outlet area of said ducts, and a hood arranged overthe lower part of both 'itaiis' and curt-ed to stream-line them as to a \VllOlQ to thegases passin g outside them.

9. In combinatioma chimney, and a draft device associated with said chimney. said draft device comprising a? plurality ot'fans capable of independent or simultaneous open ation and each having" a permanently open inlet of constant area. k

In testimony whereof I aflix my signature.

7 EMILE PRAT.

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