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Патент USA US2119381

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May 31, 1938.
.' Filed Sept. 19,_ 1936
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Ralph T. Cheeseman ,
Edgar A.H rtg,
Them Attorneg.
" 2,119,381
Patented May 31, 1-938‘
Parrrzr‘rrv omee
‘ ', _'~UNlTED 1' STATES
' '
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
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
at one endof the series of banks. , The fan is‘
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
recti?er apparatus by mounting a 38-,
preferably air,_and by compensating for the con--' e?iciently cooled. assuming, as in usual practice,
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
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
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 ‘
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