Патент USA US2119381код для вставки
May 31, 1938. 2;l19,381 R. T. CHEESEMAN ET AL HIGH POWER DRY DISK RECTIFIER .' Filed Sept. 19,_ 1936 K l l l l ]l l l hl lm 0 dIil/5‘1M l lm l)ml l l l ml l l l lr 22 w .... |” mlwf I!l l | I l l| |l I l l |l I I I I I I I I RECTIFIER UNITS TEMPERATURE ‘MEXD-raLe?.t EM P E Am T R MU RE SUCCESS/0N 0F RECTIFIER UNITS Inventors: Ralph T. Cheeseman , Edgar A.H rtg, by Them Attorneg. r " 2,119,381 Patented May 31, 1-938‘ Y Parrrzr‘rrv omee ‘ ', _'~UNlTED 1' STATES ' ' 2,119,381 . mon rowan nay nrsx nnc'rmnn Ralph T. Cheeseman, Lynn, and Edgar Barty, ’ >_ Marblehead, Mass., assignors to General Elec-v tric Company, a corporation of New York ‘ ‘Application September 19, 1936, Serial No. 101,640_ 3 Claims. ‘ (or. use-see) Our invention relates’ to current rectifying ap- ‘ sequent progressive increase in temperature of paratus of the dry disk type designed to supply the cooling medium by so forming the radiating direct current from alternating current linesfor ?ns that the area of the ?ns corresponding to the operation of devices, such as motion picture , succeeding banks of the series is increased pro '5 are lamps, requiring relatively-high‘power. The . gressively. Our invention will, be better understood from "principal objectof the invention is the provision the following description when considered in_ con of an improved cooling arrangement for the rec ti?er apparatus whereby relatively high current nection with the accompanying drawing, and its scope will be pointed out in the appended claims. Referring to the drawing, Fig. 1 is a side ele- 10 outputs forv the arc lamps of high power motion m picture projectors, or for other uses requiring such large current outputs, are obtained from ‘a. recti?er apparatus of the my disk type which' is more compact and of lower cost than are dry ~vational view; partially in section, of a recti?er apparatus in which our invention has been em bodied; Fig.- 2 is a sectional view on line A-A recti?er apparatus heretofore available for the ' l5 above-‘mentioned uses. _ > a ' '5 , of Fig. 1; and‘ Fig. 3 shows curves illustrating the operation of the embodiment of our invention 15 ' , To supply the high, current output required 'shown inFigsl and 2. In Figs; 1 and 2, the numeral l0 designates a in presentlmotion picture theaters in which pro recti?er unit comprising a casing II in which are' mounted a plurality of recti?er banks or stages , jectors of the high intensity type are employed, dry disk recti?er apparatus ‘has been provided l2, II, II, comprising respectively the adjapently 20 '20 ‘heretofore incorporating a special arrangement of recti?er units. associated with a forced draft 1 disposed sets, of recti?er stacks l5, l6 and II as- _ - _ sembled in the usual manner by clamping a vplu rality of recti?er active elements ll,~l9‘or 2D and, their associated heat radiating fins 2!, 22 or 23 ‘ air cooling means, suchv as shown, for example, ' in United States Patent .No. 1,947,240, wherein blowers cause cool air to ?ow over the recti?er 25 active ‘elements and in contact with radiating on bolts or rods 24. The stacks i5, It, ll of the L corresponding banks l2, II, It are preferably‘ mounted in substantially the same plane, and ?ns associated with these elements. In the rec ti?er apparatus shown in the above-mentioned the banks of stacks are~preferably arranged with patent, the recti?er elements which require cool ing are arrangedside by side in the same plane . their planes parallel, thus forming a series of to form a single-layer recti?er banker assembly banks of recti?er stacks.‘ To provide means for 30 through which ?ows the current .of cooling air. ‘causing a current of cooling air to ?ow through casing‘ Ii and in contact’ with the active ele ments and radiating?ns of the banks of recti?er stacks I! to ll, a propeller or fan 25 actuated by a motor 2! is mounted in the casing, preferably , » In this prior apparatus, the current of cooling air is therefore caused to come into contact with and ‘ . to absorb heat losses from only one layer or stage ' _35iof__-'recti?er active elements \and heat radiating , c , ‘ . ; at one endof the series of banks. , The fan is‘ k 1, 5 In‘ certain other prior recti?er apparatus of ,preferably’so arranged that air is drawn in at the bottom of-‘the casing II and is forcedthrough the banks l2, I3 and it in series, and out of.the ‘:the dry disk type for the supply‘ of relatively high “direct current power and incorporating forced in draft air-cooling means, the air is caused to ?ow casing through suitable openingsformedv therein. ‘over a number of recti?er ‘stacks in succession, ' _ With the arrangement of recti?er banks‘and ‘ but the arrangement is such that in so doing the fan so far described herein, the cooling air/from air becomes heated by reason of the absorption fan 25 ?rst comes in contact with the bank‘ I! v(if-heat losses from the ?rst stacks encountered constituted by recti?er stacks I! having radiat and is‘ therefore less eiiicient in absorbing heat ‘ ing ?ns ll of suitable area for transferring the losses from the succeeding stacks. with conseé qienci tendency vof the latter stacks to become heat losses, of the latter stacks overheated and damaged. ture by absorbing the heat losses‘iin stacks II now , . ' the cooling air. The air which has thus been r \ in tempera In accordance with our present invention, a vpasses through the next bank- it of the series of relatively high current output is obtained from I > _ banks, absorbing heat from the stacks ll, there- by being raised still higher in temperature, and ries of patallelly arranged banks or stages of thence through the-‘?natbank it of the series to absorb the heat losses'from. the stacks recti?er active elements and their associated radiating ?nsgin a current of cooling medium, n. Therefore, the ‘?rst bank lief-the series is a recti?er apparatus by mounting a 38-, preferably air,_and by compensating for the con--' e?iciently cooled. assuming, as in usual practice, > ' ' _ . L ' / _ , 2 2,119,881 that the stacks II constituting this bank are pro vided with ?ns ll of suitable area, considering the ambient temperature and the volume and ve locity of air supplied by the fan 2|. But since the temperature of the air current coming in con tact with the succeeding banks II and ll of the series is progressively raised because of the ab sorption of heat from banks l2 and i3. inade quate coolingof banks l3 and I4 results unless 10 a means is provided to insure su?lciently rapid transfer of the heat losses, in these latter two banks of the series, to the progressively heated current of cooling air. In accordance with our present invention, this 15 difficulty is overcome by forming the radiating ?ns 22 of the second bank I! of greater area than the ?ns 2| of the ?rst bank l2, and correspond , ingly ‘forming the ?ns 23 of the third bank ll of greater area than those of the second bank. 20 The effect of thus providing ?ns of progressively increasing area throughout the series of banks I! to I4 is illustrated by the curves of Fig. 3 wherein, as the cooling air passes through the banks of recti?er units in ‘succession, the air temperature 25 rises correspondingly, but, since the air tempera circulation means or by means providing a forced circulation. ~ Our invention has been described herein in a particular embodiment for purposes of illustra tion. It' is to be understood, however, that the invention is susceptible of various changes and modi?cations, and that bythe appended claims we intend to cover any such modi?cations as fall within the true spirit and scope of our invention. What we claim as new and desire to secure by Letters Patent of the United States, is: 1. A recti?er unit including a plurality of rec ti?er stacks of the dry disk type, each of said stacks including a plurality of active elements and heat radiating ?ns, and means to cause a 15 current of cooling medium to ?ow through said unit in contact with said active elements and said ?ns, said stacks being so arranged relatively to each other that said cooling medium ?ows over said stacks in series, the ?ns of the stacks to 20 which said current is ?rst supplied being of a predetermined area to cause said medium to absorb the heat losses of said ?rst stacks, the ?ns of the succeeding stacks being of progressive ture rise is compensated for by the progressively increased, radiating surface, the temperature of the recti?er units remains substantially constant. Thus, in a single apparatus casing in which may ly larger area than said predetermined ?n area, 25 whereby to cause said medium to absorb su?lcient of the heat losses .of said succeeding stacks to maintain said stacks at substantially the tem perature of the ?rst stacks to which said medium 30 be mounted a single fan or similar means for is supplied notwithstanding the higher tempera 30 causing a ?ow of cooling air, a marked increase ‘in the number of recti?er units in the apparatus and thereby a corresponding marked increase in capacity of the apparatus are made possible with 35 out a proportionate increase in the size and cost of the apparatus. _ The arrangement of recti?er units and means for causing a ?ow of air in series through the units in accordance with our invention may be 40 such that the air is either forced through the _ units, as illustrated in Figs. 1 and 2, or is drawn through the units, or the fan or other means for producing the ?ow of air may be located between certain of the recti?er units. Further, in some 45 applications of the invention, a fan or similar means for causing ?ow of air or other cooling medium through the recti?er units in series may be replaced by a natural circulation means. In the embodiment of the invention herein i1-' lustrated, the banks or stages of recti?er units or stacks are disposed vertically and above the fan II. Any other suitable arrangement may be ‘ employed, however. whereby cooling air is caused to ?ow uniformly through a plurality 'of serially ture of said medium. . 2. A recti?er unit including a plurality of banks of recti?er stacks of the dry disk type, the stacks of each bank being mounted side by side in sub stantially the same plane and each including a plurality of active elements and heat radiating 35 ?ns, said banks being arranged parallel to each other, and means to cause a current of cooling medium to ?ow through said banks in series, the ?ns of the series of banks being of progressively larger area as the‘distance' traveled by said cur 40' rent through said series of banks increases. 3. A recti?er unit comprising a casing, a plu rality of banks of recti?er stacks mounted there in, each of said stacks comprising a plurality of active elements and heat radiating ?ns, and 45 means to cause a current of cooling medium to ?ow through said casing, said banks being ar ranged in series with respect to said current whereby the temperature of said medium in creases progressively as said medium comes .in 50 contact with succeeding banks of said series, the ?ns corresponding to succeeding banks of said series being increased in area progressively to disposed recti?er banks having radiating ?ns of compensate’ for said temperature rise of said 5'5 55 ._progressively increasing area. Further, instead medium. ‘ of air, other cooling mediums such as oil may be employed, the medium being circulated through the recti?er units in series, either by natural ‘ RALPH T. CHEESEMAN. EDGAR A. HAR'I'Y. .