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Патент USA US2122768

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July 5, 1938.
2,122,768
1.. L. YOUNG
TEMPERATURE CONTROL DEVICE I
Filed July 10, 1955
E5
20
27
INVENTOR
LLOYQ? LXOUNG
BY
,>%ZMM
‘
ATTORNEY
2,122,768
Patented July 5, 1938
uNrrEo STATES PATENT OFFICE
2,122,768
TEMPERATURE CONTROL DEVICE
Lloyd L. Young, Patchogue, N. Y., assignor to
Radio Corporation of America, a corporation
of Delaware
Application July 10, 1935, Serial No. 30,670
4 Claims. (Cl. 200-81)
This invention relates to a temperature control
device or switch, and is particularly adapted for
opening and closing an electrical circuit which
controls a heater current.
An object of this invention is to simplify and
-
improve ?uid-expanding temperature control
devices or switches of the mercury type which
can be applied to radio apparatus or any other
device requiring substantially constant temper
l0 ature.
The fundamental principles of this improved
temperature control device or switch are based
upon the Bourdon pressure gauge.
In the devices known in the prior art there has
15 not been suf?cient sensitivity and mechanical
ruggedness to satisfactorily apply them to com
mercial radio apparatus generally as the insensi
tivity of a thermo-regulator prevents the main—
tenance of an exact even temperature. Further
,,. more, mechanical fragility renders such instru
ments unsatisfactory for use by an unskilled op
erator.
It is an object of this invention to overcome
these defects of the devices or switches known
in the prior art and to combine high sensitivity
with a device having rugged mechanical strength.
This invention is also an improvement over the
temperature control system of the mercury con
tact-making device which has been described in
my copending application Serial No. 568,962, ?led
"J October 15, 1931.
This invention will be more thoroughly under
stood by referring to the accompanying drawing,
in which
hFig. 1 is a plan view of the temperature con
“) trol device of this invention;
_~
Fig. 2 is a side elevation of Fig. 1, and is partly
in section; and
Fig. 3 is a detail of the thin metallic tube eie
pressure element 3 being soldered in any suitable
manner, such as by silver solder to the short tube
9 so that the spacing inside the pressure element
3 is in ?uid communication with the chamber I I.
Both ends of element 3 are sealed so as to be per
fectly oil-tight. The unsupported end It is con
nected by means of an electrically insulated pin ‘I 10V
to one end of a lever 5 which forms a linkage sys—
tem between the pressure tube and the electrical
contacts. The lever 5 is arranged in such a
manner that movement of pressure element 3 will
not be clamped by the stiffness of the points of 15
connection through pin ‘I. Therefore, mechani
cal connection will always be such that any move
ment of the element 3 will be communicated to
lever 5 so that lever 5 will be arranged to freely
move about pin I2 which acts as a pivot point for
the lever system.
The movement of lever 5 will cause an electrical
contact to be made or broken at the contact ‘6 ‘
which is secured to an insulated ring 4 and fas
tened to the central support member I by. means
of a threaded stud I‘! and further insulated by a
Washer 53, as shown in Fig. 1.
The top of the central support tube I contains
an adjustable needle valve 2 which shuts off the
middle chamber inside the element 3 and the
support tube I from atmosphere entering through
the aperture or opening 22, or by space between
the threads. The heating element I5 is located
within the heater block 8 and is connected to a
control circuit 20 which comprises any suitable .
relay device such as the well-known Thyratron
relay, not shown in detail.
A protective housing it is desirable to protect
pansible liquid, such as oil, acetone, alcohol, car
bon tetrachloride, glycerine, or any other suitable
the control device and the electrical contacts. A
thermometer I I indicates the temperature of the 110
heating block 8.
The operation of the device is as follows:
Assuming that the complete unit is at room
temperature and that the desired operating tem
perature is to be 45° centigrade, the needle valve
2 is ?rst opened and no pressure will be built up
in chamber II so the contact device will be in
liquid having the requisite expansion qualities.
operable.
kw ment.
Referring now to Figs. 1 and 2, a central sup
port tube I is threaded into the heater block or
casing 8 which may be a part of any desired ap
paratus, the temperature of which is to be con
all
bent into an arc of a circle of any suitable radius,
as shown in Fig. 1. A small opening is made on
one side near the end facing the short tube 9, the
trolled. Contained within the block 8 is an ex
50 I there is a short tube 9 which supports and con—
When the temperature has risen to the desired
value, as indicated by the thermometer 2| which
nects, in fluid communication, the pressure gauge
element 3 with the central support tube I. A de
tailed showing of this pressure gauge element is
shown by Fig. 3. The tube is made of very thin
55 brass or copper which is pressed ?at and then
is intimately connected with the block 8, the op
erator closes tightly the needle valve 2 and the
device will then start regulation of the tempera
ture. The generation of heat in the heating ele
ment I5, located within the oil-?lled block 8,
Located about midway on the central support
2
2,122,768
causes the oil to expand and the pressure ele
2. A temperature control switch for controlling
ment 3 to function in the same manner as the
the temperature of a heating unit located within
a casing containing a ?uid, said switch compris
ing a central support tube located above said
casing and in ?uid communication therewith, an Cr
opening in the side of said support tube, an in
element of a Bourdon pressure gauge, that is, the
free end ?exes outward and this motion is trans
CH
mitted through pin 1 to the linkage system 5
which is pivoted about a point 12, thus making
contact with contact element 6. Through the
sulating ring surrounding said central support
terminal leads l3 and M the heating relay 2!) is
tube, a pressure gauge of the Bourdon tube type,
short-circuited and the heating current in the
When the
oil begins to cool and contract, the pressure in
side element 3 drops and the free end ?exes in
wardly causing the contact 6 to break, thus re
ring and a linkage system pivotally located on said 10
insulating ring and cooperating with said pres
10 heating element I5 is interrupted.
establishing the heating current.
This cycle of operation is repeated in very short
time periods, which provides a substantially con
stant temperature regulation of the block 8. The
Bourdon tube will be made to operate at the low
pressure end of its pressure range so as to stand
20 considerable overheating without harmful pres
sure.
While only one modi?cation of this invention
has been disclosed, it is to be distinctly understood
that other modi?cations will present themselves
to those skilled in the art. For example, lever 5
may be eliminated and the contact made directly
in the free end of element 3. It is to be further
understood that this invention is not to be limited
to the modi?cation as shown, except such limita
30 tions as are clearly imposed by the appended
claims.
Having thus described my invention, what I
claim is:
l. A temperature control switch for regulating
35 the temperature of a heating unit located within
a casing containing a ?uid, said switch compris
ing a central support tube located above said cas“
ing and in ?uid communication therewith, an
opening in the side of said central support tube,
40 an insulating ring surrounding said central sup
port tube, a pressure gauge of the Bourdon tube
an electrical contact secured to said insulating
sure gauge which is in ?uid communication with
the opening in said central support tube, said
pressure gauge linkage system and contact de
vice arranged for controlling the temperature of
said heating unit.
3. A temperature control switch for regulating
the temperature of a casing containing a ?uid,
said switch comprising a central support tube lo
cated above said casing and in ?uid communica 20?
tion therewith, an adjustable needle valve in ?uid
communication with the outside atmosphere for
adjusting the temperature to be regulated within
said casing, an insulating ring surrounding said
central support tube, a pressure gauge of the
Bourdon tube type partly surrounding said in
sulating ring, a linkage system arranged to oper
ate electrical contacts for controlling a heating
unit located within said casing.
4. A temperature control switch for controlling 30
a heating unit located within a casing containing
a ?uid, said switch comprising a central support
tube located above said casing and in fluid com
munication therewith, an adjustable needle valve
in ?uid communication with the outside atmos 35
phere for adjusting the temperature to be regu
lated within said casing, an opening in the side
of said central support tube, a ?uid pressure ele
ment adjacent said central support tube, a sup
port element connecting said opening with said
type partly surrounding said insulating ring and
pressure, element, a lever system attached to said
in ?uid communication with the opening in said
support tube, a linkage system secured to said
insulated ring and arranged to operate electrical
contacts for regulating the heating unit located
within said casing.
pressure element to control the heating unit
within said casing.
LLOYD L. YOUNG.
45
central support element cooperating with said
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