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Oct. 29, 1946.
E. PAILLE
2,410,128
THERMOELECTRIYC GENERATING DEVICE ‘
Filed Feb. 28, '1944
III
ZSnnentor;
fZ/Gf/YE P4145,
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' i’atentecl Oct. 29,1946
2,410,128
.=-j.,
UNITED THERMoELEornro
-.,ST_ATI_E.S GENERATINQDEVIC?
PATENT’ _ OFFICE“?
;, ,
Eugene Paille,l..os Angeles, Calif;, I-assignor to"
' General Controls 00., _-Glendal'e,Ca1if.~, a core.
poratrion of California.
Application February 28, 1944., Serial No. 524,157’
7 Claims. (01. 136-4)
1
My present invention relates to thermoelectric
generating devices andmore particularly to those
,,
_
of the type adapted to be heated by‘electricity. .
In control systems energized by alternating
current supplied by the service lines, it is some- ..
times desirable to provide a source of direct cur
rent for the operation of a sensitive device such
as an electromagnetic relay or pilot valve. For
this purpose it has, been proposed to employ a
thermoelectric generating device, or thermocou “10
ple,"and to heat the- hot junction‘ thereof by
means of an electric resistance coil._ In spite of
the fact that the ef?ciency of translation of al
ternating to directv current infsuch ‘a’ device is
very low, when only ae‘smallwamount ‘of’ direct
erably ?rst so softened by the heat that ‘the
member is ?rmly-embedded therein, as is shown
vin-Figure'zz. To the free ends of thernembers
lli—_l5 are welded copper leads I6 .for connect
ing the device't'o’ a1 load l'l ‘which‘may be, for
example, the coil of an electromagnetic relay.
The junctions 2i and 22 of the copper leads l6
and the‘ conductors .l4—-l5 constitute effectively
the‘ “cold junction” of the device.
~
If the arrangement is'such that the distance
between the generating device and the load is
short, the copper leads may be.dispensed with
and the conductors vM—‘I5 connected directly to
the load. However, ity is not usually advisable ‘.to
.115 extend-‘the conductors l4-—l,5 to a considerable
current is required a thermoelectric generator
distance on account of the high electrical re
is preferred to a conventional electrical recti?er
because of the “smoothness,” or absence of peri
odic interruptions, of the current produced by
sistivity'ofmost materials having good-thermo
the former.
'
It is therefore a main object of this invention
to improve the e?iciency of electrically-heated
thermoelectric generating devices, and I accom
plish this object by so arranging the electric
heating element with respect to the hot junction 25
of the device that the heating losses of the ele
electric
properties. ,>
>
-
"
,Within} the -, hollowv of the tubularmembers
i |-—l2, and adjacent the .“hot” junction thereof,_
is an electric heating element l8 which is con
veniently in the form of a resistance coil having
conducting leads I9 which extend through the
outer ends of the members for connection to a
source of electricity (not shown), such as that
ment, particularly those due to radiation and
provided by the usual alternating current service.
Closing the outer ends of the members H—l2
convection, are reduced to a minimum.
is a pair of sleeves 20 of heat-insulating material
Other objects and advantages of the invention
such as porcelain; the sleeves extending in close
will be found in the description, the drawing, 30 proximity to the element, l8 so as to con?ne the
and the claims; and, for full understanding of
heat thereof to the hot junction of the device,
the invention, reference may be had to the fol
lowing detailed description and accompanying
drawing, wherein:
and having central passages or bores for the con
ducting leads l9.
In a'practical embodiment of the invention,
Figure 1 is a longitudinal sectional view of a 35 the members H—l2 and conductors Ill-l5 were
thermoelectric generating device embodying the
constructed of No. 14 gauge “Chromel” and
invention; and
“Copel” wire. The copper leads It were also of
Figure 2 is an end elevation of the device shown
wire of the same size and hence su?‘lciently rigid
in Figure 1.
_
_
'
that the device as a whole needed no support
The thermoelectric generating device, as shown 40 other than that afforded by the attachment of
in the drawing, comprises a pair of tubular mem
the leads to the terminals of the load device or
bers H and I2 intimately joined together at one
relay. When the amount of energy expended in
of their respective ends by a weld l3. The mem
the heating coil l8 was 5 Watts, the amount of
bers H—l2 are of thermoelectrically dissimilar
energy delivered to load I‘! (having a, resistance
materials, such as, for example, the well-known 45 substantially equal to that of the device) was
alloys “Chromel” and “Copel,” and the welded
junction of the members constitutes the “hot”
junction of the device.
Fused or welded to the members H—l2 ad
0.0225 watt; such energy being sufficient to op
erate a sensitive D. C. electromagnetic relay,
The embodiment of my invention herein shown
and described is obviously susceptible of modi?ca
jacent the free ends thereof are conductors l4 60 tion without departure from the spirit of the in
and I5, respectively; the material of each con
vention, and I intend therefore to be limited
ductor being the same as, or thermoelectrically
only by the scope of the appended claims.
similar to, the material of the member to which
' I claim as my invention:
I
it is attached. In the process of fusing the con
1. A thermoelectric generating ‘device compris
ductors to the members, the conductor is pref 55 ing a pair of elongated members of thermoelec
2,410,128
trically dissimilar materials joined together ‘at
one of their respective ends to form a hot junc
4
form a hot junction, an electric heating element
within said device at and on either side of said hot
tion, said members being hollow at said ends and
de?ning a cavity within said hot junction, and
junction, and heat-insulating material substan
tially closing the hollow of said device at opposite
electrically dissimilar materials joined together
ing'a pair of relatively short tubular members of
notsubstantially affected by the heat thereof.
leads extending through the tube, a pair of heat
produced by said element.
material of each conductor being thermoelectri
cally‘ similar to that of the tubular member from
sides of said hot junction and extending in close
an electric element in said cavity for heating said
proximity thereto.
hot junction, the other of the ends of said mem
6. A tubular thermoelectric generating device
bers being so remote from said heating element
formed by a‘ pair of tubular members ~of thermo
that they "are not substantially affected by the
electrically dissimilar materials joined together
heat thereof.
10 longitudinally at one of their respective ends to
form a hot junction, an electric heating element
2. A tubular thermoelectric generating device
within said device at and on closely adjacent sides
formed by a pair of tubular members of thermo
of said not junction and having conducting leads
electrically dissimilar materials joined together
extending through the hollow of the device, and
at one of their respective ends'to form a hotjunc
tion, and an electric heating element'within said 15 Ya pair ‘of heat-insulating members substantially
closing the opposite ends of said device, said heat
device adjacent said hot junction, the other of the
insulating members extending in close proximity
ends of said members being so remote from said
to the opposite ends ‘of said heating element and
heating element that they are not substantially
at least one of them providing a passage for a
affected by the heat thereof.
3. A tubular thermoelectric generating device 20 conducting lead of the heating element.
7. A thermoelectric generating device compris
formed by a pair of tubular members of thermo
thermcelectrically dissimilar materials joined to
longitudinally at one of their respective ends to
gether to form a tube providing a hot junction
‘form a hot junction, and an electric heating ele
ment within said device adjacent said hot junc 25 between the members, an electric heating ele
mentwithin said tube at and on closely adjacent
tion; the other of the ends of said members being
sides of said hot junction and having conducting
so remote from said heating element that they are
insulatingmemberssubstantially closing the op
4. A tubularithermoelectric generating device
formed by a pair of tubularmembers of thermo 30 positeends of the tube and extending adjacent
said heating element, at least one of said heat
electrically dissimilar materials joined together
insrulating members providing a passage for a con
at one of their respective ends to form a hot junc
ducting lead of the heating‘ element, and a con
ition, an electric heating element within said'de
ductor branching laterally from each of said tu
vice adjacent said hot junction, and insulating
means for con?ning to said hot junction‘ the heat 35 bular members adjacent the free end thereof, the
5. A tubular thermoelectric generating device
formed by a pair of tubular members of thermo
electrically dissimilar materials joined together
longitudinallyat one of their respective ends to 40
which it branches.
‘
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I
V
EUGENE PAILLE.
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