US1808638A - Secondary fluid current production apparatus - Google Patents

Description

June 2, 1931. c. COUPARD 1,808,638

SECONDARY FLUID CURRENT PRODUCTION APPARATUS Filed March 9, 1928 3 Sheets-Sheet 1 June Z, 1931. c. COUPARD 1,308,638

' SECONDARY FLUID CURRENT PRODUQTION APPARATUS Filed March 9. 1928 3 Sheets-Sheet 2 June 2, 1931. c, COUPARD 1,808,638

SECONDARY FLUID CURRENT PRODUCTION APPARATUS Filed March'9, 1928' 3 Sheets-'Sheet 3 Juan-few CHE/877A COUPJHD di-hr nu current and, more particularly,

45 to produce Patented June 2, 1931 y UNITED STATES PAT oFF-l cecnmsrmn GOUPARD, or mnrsrnnivon, ASSIGNOR TO soornrn ANONYME 'IION SCIENTIEIQUE, 01* mars, manner.

nnsrmm 1 sEoonnAitY FLUID CURRENT rR-onUorIoN APPARATUS! Application filed March e, 1928, Serial No.

The present invention relates to improvements in systems for utilizing the dynamic effect of a main fluid current for increasing derived fluid the velocity of a secondary or to improved ventilating systems adapted tobeapplied to chimneys and the like. 1

One of the objects of the invention is to provide a novel type of draft producing device of special form and dimensions, the latter bein so chosen asto utilize toa maximum the ynamic effect of fluid currents exterior thereto.

Other objects will appear in the course of the detailed description now to be given in connection with the accompanying drawings,

in which Fig. 1 shows, in elevation, a first constructive embodiment of the invention; .Fig. 2 represents an elevation of'a second form of the invention Fig. 3 is an elevation of a third form of the invention; V i l Fig. 4 illustrates in elevation a form of device having a plurality of smoke outlets; Fig; 5 is an elevation of a structure designed to increase'the velocity of a propeller positioned in an air current; V

7 Figs. 6 to 8 are a series of elevations showing theinvention as applied respectivelyto the ventilation of a house and ofan automobile and to prevent" theexti'nguishing of" a lantern; i Fig. 9 is a diagram showing the eifective draft produced in a chimney by a device con structed in accordance with the invention un der varying operating conditions. In the various figures ofthe drawing the main fluid currentis represented'by a' solid arrow while the secondary fluid current, i. e.

the one resulting from the dynamic'eifect of the main current, is represented by an arrow indotted lines. U V a represents a pipe in which it is desired a draft, said pipe being formed in the shape of a cylinder or of a. cone having its generatrix' inclined at substantially 7 to its axis,-b, a cylinder coaxialwith a and having one end thereof {slightly overlapping the latter,'c, (Fig. 1) 'strips attaching pipe 260,412, and in Belgiumr August 6, 1927. I

a andcylinderl) and formed so as to ofi'er a minimum of resistanceto the flow of fluids,-

elements 0 being replaced in Figs. 2 to 4 by radial supporting brackets d,-and e, a capand which, in Figs. 1, 3' and 4, is made inn the form of a flat disc supported on?) either whichvaries with the particular application by strips f (Fig; 1) or radial vanes g Fig; 2 lying preferably in the same plane as elements cand d respectively. j;

The dimensions and positi so chosen that, if V.

1) represents the interior diameter of a at its free extremity, i

- D the interior diameter of b, H the overall lengthof 6, H the overlap of b overa, 1.5D D 2.5D O.10II H 0.30H v -0.5OD H 'D a V where the symbol indicates'-is less than.

Similarly, if Dg=the diameter'of cap-6,1

I 1 n'sofaandb are Y and H =the distance between eand b, the",

following conditions should be substantially fulfilled If H is given a predetermined value, c. g. f centlmeters, a series of curves such as is represented in Fig. 9 may be determined for of the air in pipe at and '0 the velocity of the exterior air) .,and heights H as abscissae.

' Figs. 1 to 3 show the invention applied t a chimney having a single outlet. In Fig.4, main pipe a of the chimney is fitted with a plurality of branches a formingan angle of any obliquitywith a. If desired, a maybe rotatably mounted, thus permitting "branches a to change position withthe wind.

Fig. 5 illustrates the inventionxapplied*to the rotation of a propeller it intended to furnish power. Here pipe at is mounted at right angles, and so as to project into aerodynamic chamber 2'. In this form of device cap 6 is unnecessary and is, therefore, eliminated.

Fig. 6 merely shows that the invention is not limited to chimneys and the like carrying hot gases but maybe applied equally well to a space containing air at the same temperature '10 as the gas current producing the draft.

In applyin the invention to an automobile or other closec moving veh1cle,1tis found that the direction of the ventilating current is .never reversed and takes .place always from the interior towards theexterior, Similarly, 7 inolamptl shown in Fig. 8, the most violent gusts of wind fail to extinguished the'fiame. Obviously, the invention is not limited to the particular devices hereinabove shown and V described, but maybe applied in a variety of other ways;flthus either the primary or sec ondary currents may be liquid instead of gaseous or may carry liquid or solidparticles in suspension. Similarly, pipe (1 and cylinder 6 may be given a polygonal or elliptical sec tion or may take the form of any surface of revolution having, thereof cylindrical .cap 6 may be conical 2) or spherical or spiral; element a or.

b or e or all three may be made of perforated 7 instead of solid material; theaxis of element b maybe out of line with the axis of a; cylinders a and b may have the same diameter;

etc., etc. 1 o

If element?) is given some other shape than that of a cylinder and pipe a remains c1rcu lar in section, the following relation should A the free extremity of a.

ingrelations shouldbe fulfilled.

I WhereS=the area of a section taken at .S =the area of a-section taken I at either extremity of b,

' S '=the area of a section taken at the free end of cape (case where e is hemispherical,

conical or other shape) H=th ns 9 6 )referably, a portionv ,a'odistance H having an opening extremity of section S v within the limits definedby the following e'x-.

H =the distance separating 6 and-e, and V=the volume ofb.

Whatever may be the form of elements of a and 6 their sections should preferably have the values, 7

S1; S- l/Vhat I claim is 1. A device ofthe class D and a length H' mounted on one'end of said pipe so as to present an overlapping por- 1 described comprising a pipe having an extremity of diameter D, a cylindrical element having a diameter tion of a length H and awcap of diameter D mounted at a distance H from said cylindrical element,:'said dimensions'D, D D

H, H and H satisfying the relations 2D is greater than 3D and is less than" 5D 10H is greater than H and is less than 3H 2H is greater than D and is lessthan 2D is greater than 3D and isless' than 6D 4H is greater than 3D and is less than6D. i f 2. A device of the class described comprising a pipe having an extremity of diame- V ter D, a cylindrical element having a diameter D and a length H mounted on one end of said pipe'so as to present an overlapping portion of a length H and a cap, of diame ter D mounted at a distance H; from said; Y

cylindrical element,said dimensions D, D D H, H and H satisfying the relations 20D is greater than 33D; and is less than 38D o o 20H is greater than 13D and is lessthan 18D 4D is greater than 9D'and is less than 11D 8H is greater than? D and is less than9D. 3. In a deviceof the class described,a pipe having an extremity of sectional area S, a hollow member of length H fland volume V mounted on said pipe-and presenting a section having an area S and a cap spaced at fromsaid hollow member and said dimensions S, S S H,

pressions: four timesarea S is greater than .ni'netimes area S. and is less than twenty-five times area S dimension H is greater than the radius ofa circle having an area S and is less than twice the radius of a'circle having an area S ;,two times area S is greater than two 7 times area S and is'less than three times area S twenty times dlmenslon H is1 greater thanfive times the radius of a circle having an area S andis less than six times the radius.

of a circle having an area S the volume V side equal to the diameter lofa circle having volume of a cube having a sideequal tothe diameter of a circle having an area S.

4. A' device of the class described compris I 10H is greater than 2Hand is lessithan 3H' is greater than the volume of a cube having a;

- an area S and-is less than five times the V ing apipe having an extremity of diameter I D, a cylindrical element having adiameter 1 .and a length H mounted on one end of 7 said pipe so as to present an overla iping pormy hand.

CHRISTIAN GOUPARD.

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