Патент USA US2406121код для вставки
Aug- 20, 1946, " . . A.'_J'.“‘YvOUNG, 7 HEAT‘ TRANSFERRING MEANS SUITABLE ' 2,406,121 .THERMIONIC. DISCHARGE APPARATUS ’ Filed-‘Jan? 22,1943 " Patented Aug. 20, 1946 h , v , 2,406,121 UNITED- STATES? PATENT orrl-ic HEAT ‘TRANSFERRING MEANS SUITABLE FOR THERMIONIC DISCHARGE APPARATUS" Arthur James: Young, ,Danbury; England; ,assignor . to-Radio Corporation oi America; a. corporationv ' ofDelaware . Application January'22, 1943', SerialNo: 473,1721 8 Claims. (Cl. 25.0-27.5) < . The’ present inventiomrelatesz'to:heattransw 2“ if“therearemore;thanronerbarriersmnone-‘side ‘ ferring; apparatus wherein. it :is :required. to. e?ectT of “all the barriers)i is~ constrained to passwbetweem transference. otheat>betweena stream: of ?uid; the?ns in order‘toreach the othersideof'thea and a metallicbody; barrler- (or barriers) and‘ so to reach thevoutl‘et? An objector the invention is toprovide 'a.:sim-= 5‘ atat‘h‘e other end'iof the ‘duct. ' ple-and e?icient cooling; IIIGaIISlfOT'aIL electroni discharge device. ‘Though the invention is nottstrictly limited tothe transferenceof heat‘: from acylindrical When-a1 single-barrier is usled'itm'ayftakel the= form.v of an=elliptica1= annulus extending from; the top to the‘bottomdisc. With this formfthelj ?uid inlet passages at the‘ successive discsvw-ilL? anode of a tube to'a cooling. ?uid. such as air‘; 10! vary in size and in certain cases-this might-leach cross section.. The. invention‘ is, however, to be’ 15-. considered. as‘v applied to heat transferring ar-v rangements: in which ?nsnareidisposed‘co-axially’ about and. inheat exchangingcontact. with the: ‘ The coaxial cooling ?ns may ‘consist. of‘a hum-. her‘ ofmetaldiscs having acentral aperture in: which the metallicibody, or anode of the tube; body» and in/which: the ?ns: are‘. mutually spacedii ‘ ?ts tightlyso that it» may bevsoldered" thereto apart. 20”‘ with'the minimum amount‘ of solder. The ‘discs? Accordingtatheinvention; alheatitransferring- device for effecting‘transferenc'ezof'heat‘between? a: stream of ?uid: and a: metallic body,‘ of the are'spacedapartlby distance ‘piecesvih the‘form\ ofJ washers, which may be circular, ?tting the body-‘or anode. - kind" in which ?ns. arei‘disposed.‘coeaxially about; In place‘ of? using‘avseries of discs‘ to'form ai and in heat‘vexchanging contactwitlr the body, 25" built uprunit the device may be made-by milling“ the ?ns I being. mutually spaced! apart, and? in slots-kinwal-solidibody'or'cylinder‘of brass‘ or‘other" which the. body and' its ?ns-area accommodated’ suitable *goodlconductingl metal. ' in a duct of larger diameter (or of? larger cross: Theeapplicant'has,‘ inv connection with the-cool; sectional area) than the outside diameter (or ing of the anodes of the thermionic devices; with») cross sectional area) of- the ?nsIand"v through- 30*’ which he is‘ principally‘ concerned‘; commonly which duct the rstrea-miof. ?uid ?ows; is‘»charac-~ used axial-“air ‘?ow radiators» with‘ both coaxiali terized in that there is provided? between the*and: radial cooling ?ns.‘ For hig‘li'speci?c load-"e wall of the ductand' the' outer‘. edges’ of“ all of’ ings,» the-coaxial cooling‘?ns (i. e; those in-w-hich" the=?ns at least one continuous barrier'wherebyr the stream’ of? cooling‘ ?uidi moves radially in‘-v reach the other slde of the barrier (or barriers) radial length of radiator, and further the Inlet and so to reach the outlet‘ at thev other end of" 40'.‘ and‘. outlet ori?ces of" the‘ radiator itself?" cam the duct‘ usually be of such dimensions that the speed" of ‘ According toa feature of the. invention, a‘cool-- ?ow: of the?uid' will be suitable‘to the'case irrv ing device for the (substantially cylindrical) which.._ax=sma1L radiator is‘ required; Where‘ the* anode of an electronic device, or vacuum tube,- ‘ primary. requirement is“ small‘ size‘ then high“ iuct of larger diameter than'the outs1de d1a-m-the latter case, axial flow with a radial ?n 1s zter of the ?ns and through which cooling ?uid 50 preferable. such‘ as air)‘ flows- is characterized: in that there; s-providedr'between. the walliofrthel duct1andlthe= ruter‘edgesof. all- the?nsat‘leastone continu-'-~ Di'?icultieswith devices providing radial‘ ?ow (to which devices the» present; invention is‘di-L rected). haveib‘een that'the addition of-‘suitabl'er : |us barrier.v whereby ?uidentering-f the; duct1at¢ means'for.admitting?and'exhaustingth-e'airrh'avw“ >ne: end: thereof: on. one:.sidei>.ofi thel barrierrtorr 551led. to1 large. increases in’ the diameter‘ of} these ‘ 2,406,121 'Many of the advan radiator. and its holder. radial ?ow have there; tages of devices providing fore been lost. 7 a 4 in which two members B’, or curved barriers are employed, a further im provement may be made by which these differ ences between the effective inlet and outlet ori ?ces which in certain circumstances may be dis V companying drawing, V. The present invention provides, therefore, a method of mounting’ a radial flow radiator in an air duct so that the overall diameter is very little advantageous, may be reduced. ‘In this arrange stance an overall diameter v(that is over the ment, the two barriers maybe so constructed as, together, to constitute a continuous member bent so'asto extend from an edge of the upper , ballle) of 90 mm., and a diameter for the radiator most ?n at one end (1’ of a diameter thereof to greater thanithat of the radiator itself, for ine of 80 mm. have been found suitable for an air a point d" von the edge of the lowermost?n, back to the edge of the uppermost ?n atthe The invention is illustrated in the accompany opposite end of said diameter, down again to ing drawing in which: ' 3 ' a‘point-on the edge of the lowermost ?n, and Fig. 1 is an elevational view, partly in section, thence to the uppermost ?n to join the upper showing cooling ?ns provided‘ with a single bar 15 most ?n at the same one end (1’ of the diameter, the two points d"_on the lowermost ?n being rier; Fig.and 2 is a fragmentary perspective view'of _, V‘ at? the two ends of a diameter thereof displaced cooling ?ns provided with a double barrier.’ v’ by 90° from the ?rst/mentioned diameter. The cooled tube. ‘ ' . . A particular embodiment of the invention,: in - 20 shape of the barrier about the bends at d’ and air-cooled tube, is illus its application ltoof an the accompanymg drawing.v trated in .Fig. In thisembodiment the metallic anode A, which d” will determine whether there is any di?er-l ence between size of, inlet and’ outlet. In the limiting case, if the shape of the barrier at the forms part of the envelope of the tube, is pro “bends” were rectangular, the cross section could vided with tubular member AI, circular, washer 25 be made exactly equal, but in practice the cor like radiator ?ns F, spaced apart from each ners might become almost “dead”. owing to ed-' other and in close heat exchanging relationship dies, and therefore the most suitable shape would, with the anode. Fitted about the edges of, all be found by experiment. 7 The barrier, or barriers, as the case maybe, the washers is a continuous'barrier Bfwhich, as illustrated, consists ‘of an elliptical annulus ex 30 may be attached eith’erto the inner wall of the; tending from the lower edge of the uppermost duct L, or to the outer edges of all or some of _ washer WI, past the edges of all the succeeding the washers. ' , 7 Although, in the speci?c description, washers washers, to the upper edge (not visible in the ?g ure) of the lowermost washer W2. The upper have been referred to, inlwhich case the several end of the annulus is in contact with the upper 35 washers would be separated by spacing or dis most washer at oneend of a diameter of itand tance rings, or washers of smaller diameter than‘ those constituting the ?ns; the radiator may be" of the duct, and the lower end of the annulus is produced from a solid cylinder of brass, or other in' contact with the'lowermost washer at the 7 other end of the same diameter ,of the duct.‘ suitable metal, in which circular col-axial slots‘ ' have been cut. In either case, the anode should Thus the duct is divided into two parts, between 40 which the only‘communication for, the cooling 7 ?uid ‘is by way. of the spaces separating the sev eral washers from each other. The assembly of preferably be a close ?t in the central ori?ce of the radiator so that it may be soldered to the inner wall of the ori?ce with a' minimum of‘, tube and ?ns may be held, by means of a clamp, solder and a minimum risk of having air pockets in a cylindrical fluid airduct K of larger in 45 or gaps between the anode and radiator. It is not necessary that the tube and its ra ternal diameter than the diameter of the wash ers, so that a space exists between the wall of diator be ?xed in the duct L, it may merely be] the duct and the washers. The barrier is ?tted slipped therein. ' between the wall of this duct and the edgesof What I claim is: l. A heat transferring device for effecting 50 the ?ns.» ' ' Suitably’ in such a heat transferring device transference of [heat between a stream of ?uid ‘applied to such a tube, wherein the overall diam- * and ,a cylindrical metallic body, of the kind in " eter of the ?ns is 80 m. m.,‘in which there are which a plurality of circular cooling ?ns are dis posed coaxially about and in heat exchanging contact with the body, the ?ns being mutually spaced apart, and in Which the body and‘ its ?ns are accommodated in a cylindrical duct of larger thirteen washers of brass 1.5 m. m. thick,‘ hav ing a root diameter of 42 m. m. and spaced apart ' 1.5‘ m. m., and in ‘which the overall diameter of the duct is 90 m. m.,‘the dissipation of heat may be equivalent to 400 W for a current ‘of air and cross sectional area than the out ' diameter side diameter and cross sectional area of the ?ns ‘ at a temperature, at the inlet, of 30° C. ?owing at the rate of 25 cubic feet/minuter-(equivalent ,and through which duct the stream of fluid flows, ' to a speed of approximately 1'7 metres/second), 60 characterized in that there is provided between or to 800 W for a current of air at the same the wall of the duct and secured to different temperature ?owing at the rate of 50 cubic positions on the outer edges of all of the circu- i lar’cooling ?ns at least‘ one continuous barrier feet/minute (equivalent to a speed of approxi the duct at one end there- ‘ 65 whereby fluid entering of on one side of the barrier is constrained to " pass between the ?ns in order to reach the other If copper were used for the washers, the heat mately 35 metres/second). The maximum tem - perature attained is 150° C. transferring device could be made smaller, but usually its not desired to make it smaller since the noise'due to the higher speed of the air side of said barrier and so to- reach the outlet _ at the other end of said duct. 7 ' 2. A cooling device for the anode of an elec-' 70 tron discharge device in which circular cooling might be objectionable. . ' ?ns are disposed coaxially about and in heat ex It will be appreciated that with a barrier as above described, the effective inlet and outlet changing contact with the anode,v the circular, ori?ces at the top and bottom of the device are cooling ?ns being mutually spaced apart, and in widely different from each other. By means of >.75 which the anode and its cooling'?ns are con; a modification illustrated by Figure 2 of the ac 2,406,121 centrically located in a cylindrical duct of larger diameter than the outside diameter of the ?ns and through which cooling ?uid ?ows, character ized in that there is provided between the wall of the duct and the outer edges of all the ?ns at least one continuous barrier whereby ?uid en tering the duct at one end thereof on one side ?n, and thence to the uppermost ?n to join the uppermost ?n at the said one end of the diam eter, the two points on the lowermost ?n being at the two ends of a diameter thereof displaced by 90° from the ?rst mentioned diameter. 6. A device as claimed in the preceding claim wherein the barriers are attached to the inner wall of the duct. of said barrier is constrained to pass between the ?ns in order to reach the other side of the barrier 7. A cooling device for an electron discharge and so to reach an outlet at the other end of the 10 device having at least a cathode and an anode, duct. comprising a plurality of mutually spaced circu 3. A device as claimed in claim 1, wherein a lar metallic ?ns coaxially arranged to surround single barrier is used which is in the form of an the anode of said electron discharge device, a elliptical annulus extending from the topmost to cylindrical duct surrounding said circular ?ns the bottommost of said ?ns. 15 4. A device as claimed in claim 2 wherein a and a continuous barrier‘ surrounding and at tached to a different position on each one of plurality of ba?les are used so that equal inlet said ?ns, and so arranged as to divert the ?ow and outlet ?uid passages can be obtained. of a cooling ?uid for said anode along different 5. A heat transferring device for an air-cooled portions of said ?ns. vacuum tube having an anode, said device hav 20 8. A cooling device for an electron discharge ing a plurality of coaxially spaced metallic ?ns device having at least a cathode and an anode, surrounding said anode, comprising a ?uid duct comprising a plurality of mutually spaced cir surrounding said ?ns, and two barriers which cular metallic ?ns coaxially arranged to sur are so constructed as, together, to constitute a round the anode of said electron discharge de continuous member bent so as to extend from 25 vice, a cylindrical duct surrounding said circular an edge of the uppermost ?n at one end of a ?ns and an elliptical barrier surrounding said ‘diameter thereof to a point on the edge of the ?ns and arranged to divert the ?ow of a cooling lowermost ?n, back to the edge of the uppermost ?uid along di?erent portions of said ?ns. ?n at the opposite end of said diameter, down again to a point on the edge of the lowermost 30 ARTHUR JAMES YOUNG.