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Патент USA US2411248

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Nov. 19, 1946.
T. A. CZOHEN
ELECTRICAL SYSTEM FOR CONTROLLING THE LEVEL OF’LIQUID IN C
Filed April 12, I943
2,411,248
ONTAINERS
2 Sheets-Sheet l
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Theodo PC A ‘(o/(en) INVENTOR)
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Nov. 19, 1946.
T. A. COHEN
2,411,248
ELECTRICAL SYSTEM FOR CONTROLLING THE LEVEL OF LIQUID IN CONTAINERS
Filed April 12, 1943
2 Sheets-Sheet 2_
49
771codore ACahen, INVENTO&
WM
After-n ey
Patented Nov. 19, 1945
more
shins
states PATENT
l'l'i'lCE
2,411,248
ELECTRICAL SYSTEM FUR CQNTR'JLLING
THE LEVEL OF LIQUID L'N QUN'EAINERS
Theodore A. Cohen, Chicago, ill, assignor, by
mesne assignments, to Wheelco Instruments
Gompany, @hicago, lit,
‘
a corporation of lllinois
Application April 12, 1943, Serial No. li82,8l2
3 Qlaims.
1
This invention relates
(Cl. 258-16)
electrical control ap
end of the member it’. Thus the member l2
co rounioates both above and below the liquid
level 0’ the container l for maintaining a, liquid
vide
improved apparatus for automatically
level S2; in said member 52 corresponding to the
controlling the liquid level or" a container which
5 liquid level 2 of the container. The member 92
is under high pressure and temperature.
may he of any suitable cross section but is pref
Another object of this invention is to provide
paratus.
One of the objects of my invention is to pro—
so. A
wherein a liquid level respon~
sive _ s
evice controls a vacuum
e os illatcr circuit in accordance with imped
<. cc chanaes
era'oly as shown of angular cross section, such as
hexagonal, to facilitate handling in assembly.
FY” e
change device 5 includes a grid
.“lll comprising an inductance 2i and a ca
which apparatus does not r"
V as shown in Figures 3 and
quire the major portion of the oscillator circuit
to be situated in the immediate vicinity of the
t; ‘ice 2? and capacitance
electronic oscillator not
liquid level responsive device.
Other
better t
rinediary oi‘ a concentric
do of the inductance El
conductor
which eX
further objects of my invention will
be apparent hereinafter as the
re becomes
rstood from an examination of the
in conjunction with the
nected to ground where
wherein:
detail view of
on
ini
of the conductor
' e and connections therefor
a
c _ acity of which varies with
1” :ie liquid in said member.
i ‘e 2 is an enlarged detail view partly
case acts as a dielectric.
and partly cut away showing the imped
ce 2i and capacitance 22 form a
ce as a self-contained unit;
ating circuit which is connected
tail view of the grid tank unit.
view similar to that of Figure 2
n of the impedancechange de
vice withdrawn slightly from fully assembled po 30 with t e
sition.
Referring to the di
particularly,
ce- character l desi :
.
a liquid 3 at a le
ntainer con
' .
container 5
igure 1) is provided wi
chin-g and a
.
evel ii and a
e il above the n
flange 5 for an opening t1e
s aid normal liquid
level. The impedance change dev ce 5 is con
nected to the upper ?ange and als to t‘he lower
for communicating with the container
?ange
5 both above
below the liquid level 2 therein.
These connections comprise an upper pipe ‘E
which includes a check valve 8 and a manually
is cool:
an elbow
and a T connection
i" pedance change device 6 includes a
vertically extending elongated hollow cy
_
ex
52 to act as a capacity
vlouid level in which is to be
ccrtzolled;
This
are connected
- 'i'
oscillator circuit (not
.
r circuit having a plate tank
to predeterr 16d. resonant point
‘anlz.
capacitv change device
comprising
grounded
‘
th
.
ele t‘ode
, and the
if! is connected across the in
The tuning is such as to cause the
oscillator to onen a relay s" itch when the liquid
35 level in the container 5 is at pro-chosen level. As
long as the relay switch is closed, an elect
valve cont‘ rues to so‘
le
'
'
the container
_
the co__
ty between the
i2 and the sur
'>
aging the
de-energizing the
output circuit of the oscillator to
1
re ay sv. L
and close the electric feed
the liquid level drops below the pre
control level, the capacity between the
lindrical
l2! v ch is connected at its
surfaces of the walls in member E2 and the sur
side to a pipe 33 which
_ turn connected to
faces of e lectrode 23h decreases causinCr a re
the ‘i’ it. Thu lower
d of
T ii is connect
tuning of the oscillator, energizing the relay in
ed to a vertical pipe M which in turn is connect 50
the output circuit of the oscillator and closing
ed to the cer‘ral connection on another T l5.
the relay switch reopening supply valve. This
Tie latter T 25 is connected to the ?ange 5
control process is repeated maintaining liquid at
CL.‘hroush a cock is‘
a check valve ii, The
rlghhhand side i the
a
it, as shown in Figure
proper level.
The mounting of the impedance
change device as shown in Figures 2 and 3 is such
‘l, is connected thro» u an elbow E8 to the lower
55 that it is unaffected by pressure or temperature
2,411,248
3
of the liquid within the container l and the
member l2. This mounting includes a cylindri
cal member 23 provided with annular corruga
tions or ?ns 29. The lower end of the member
28 is welded to the outer edge of a flanged sleeve
member 32} which ?ts over a reduced portion ti
on the upper end of member i2. As shown in
that by virtue of the nature of the sealed mount
ing for the extended conductor or electrode 23a,
extremely high pressures, e. g. upwards of 2,000
lbs. per square inch, within the container l and
member 22 will not endanger satisfactory func
tioning of the equipment.
In the use of high pressure liquid level con
trol equipment high temperatures are usually
Figure l the ?anged sleeve member 38 is provid
also present. In order to prevent such high tem
ed with bayonet slots 32 and is snugly ?tted over
peratures from interfering with the electrical
10
the portion 35 and removable therefrom when
characteristics of the circuit such as inductance
desired for inspection, renewal or repair of parts,
2i and capacitance 22.
'
Screws 33 co-operate by extending into the por~
The member 28 is provided with the corruga
tion 3i and engaging the sleeve til at the edge of
tions or fins 29 of thin section and large area so
the slots 32.
a minimum of heat will be conducted to the
The upper end of the corrugated member 28 is 15 that
electrical system 2 l——22 and such heat will rapid
closed by an annular plate 32 retained on said
ly dissipate by radiation and convection from
upper end by screws 35. This plate 34 is central
the large corrugated surfaces 29.
ly apertured co-axially with the member 28 and
By pass system it, H and 13 are designed to
the member i2 to receive and have mounted
prevent the liquid level in the container l2 from
thereon a female connector 36 for the grid tank
end of the co-axial conductor cable. This con
hector member
is held in position upon the
plate 34 by means of a cooperating member 33
threaded thereto beneath said plate. This me ..~
ber 3i acts to clamp a spring clip 38 against the
ever rising above the top of the electrode 232)
with the possibility of coating the skirt 4‘! of in
sulator
with a ?lm which might prevent true
operation of the apparatus. Check valves 8--l'l
‘together4 with manually operable cocks 9——l6
allow easily dismounting of the apparatus ex
teriorly of said cocks from the container i.
a cylinder as in co-axial relation with the con
As shown in Figure 3, the plate 34, from which
ductor 23 and the axis of members 28 and i2.
the grid tank unit is suspended, may be readily
This cylinder 39 forms the support for the grid
withdrawn for inspection, renewalor repair of the
tank unit comprising inductance 2i and capaci 30 parts of the grid tank unit. In this connection
tance 22 hereto-fore referred to. A smaller cir
it will be noted that the ready withdrawal of
cular plate
of insulating material is mounted
the grid tank unit is permitted by the fact that
beneath the plate til within the member 23 and
prong €=5a is slidably inserted in jacket fill. Ac
is suspended from said plate 35 by means of
cess to the interior of enclosure l2 and electrode
elongated members til which are connected to 35 231) is facilitated by removable collar G9. The
the respective plates Eli and til by screws t2 and
operation of the aforedescribed apparatus will
53, respectively. The plate lid is provided with a
be apparent from the above description and by
central aperture and has mounted thereon above
reference to my aforementioned co-pending ep
the central aperture an enlarged hollow extension
plication without further detail;
40
s4 for the conductor 23. This enlarged hollow
I am aware that many changes may be made
extension M is adapted to removably receive an
and details varied without departing from the
upwardly-extending prong tea on a threaded ex
principles of my invention and I, therefore, do
tension at which is removably attached to the up»
not wish to be limited to the details shown and
bottom of said plate and in position to support
per end of a central electrode 23a.
This central electrode 23a, is mounted in a por~ 45 described.
I claim:
celain member 45 which has an upwardly extend
1. The combination of a high pressure en
ing corrugated portion
of low leakage path
closure having an inner conducting surface
characteristics extending within the member 2i!
adapted to contain liquid at a predetermined
and a lower portion Ill extending within the
level therein, an electrode extending into the
50
member i2. These portions 12-6 and Ill are joined
enclosure for cooperation by the walls of the
by a central enlarged integral portion till having
electrode with the liquid and said surface to
opposed tapered seats 58a and 631). The central
form
capacity change device wherein the
capacity between the walls of the electrode and
surface is varied by the rise and fall of the
tral electrode in an automobile type spark plug 55
liquid
in accordance with the liquid level, the
is sealed within the porcelain mounting there—
liquid forming a portion of the electrical ca
for. The enlarged portion 58 of the porcelain
pacitance, a non-conducting support for said
member s5 is seated between suitable gaskets in
electrode 123a is sealed within the porcelain mem
ber 455 somewhat in the manner in which the cen
electrode surrounding the same, the enclosure
a threaded recess in the upper end of member is
being provided with an opening and a pressure
and is sealed within said recess by a‘ suitable seal 60 seal therein for said electrode and support, and
ing and retaining annular screw bushing 49. The
a grid tank unit mounted outside said enclosure
lower end of the electrode 23a is provided with an
in spaced relation therewith, and forming an
enlarged extension 231). This extension 232) is
oscillating circuit including said electrode, the
provided with transverse apertures 5i} and is so
mounting for the grid tank unit including an
65
shaped that the capacity of the condenser formed
envelope member surrounding the outer end of
by the surfaces of said extension and the sur
said electrode and having an opening for receiv
faces of member l2 will increase uniformly as
ing the grid tank unit in position upon assembly
the liquid rises, and decrease uniformly as the
to readily connect with said electrode.
liquid recedes to in turn aifect the tuning of the
2. The combination of a high pressure en
grid tank unit. The apertures 59 cause rapid 70 closure
having an inner conducting surface
draining of the liquid dielectric as it recedes pre
adapted
to contain liquid at a predetermined
venting a ?lm remaining on the surface of 23?)
level therein, an electrode extending into the
which might prevent uniform lowering of the
enclosure for cooperation by the walls of the
capacity, as intended, and consequent interfer- "
electrode with the liquid and said surface to
75
ence with true operation. It will be apparent
2,411,248
5
form a capacity change device wherein the ca
pacity between the walls of electrode and said
surface is varied by the rise and fall of the liquid
in accordance with the liquid level changes, the
liquid forming a portion of the electrical ca
pacitance, a non-conducting support for said
electrode surrounding the same, the enclosure
being provided with an opening and a pressure
seal therein for said electrode and support, and
a grid tank unit mounted outside said enclosure
in spaced relation therewith, and forming an
level therein, an electrode extending into the
enclosure for cooperation by the walls of the
electrode with the liquid and to form a capacity
change device wherein the capacity between the
walls of electrode and said surface is varied by
the rise and fall of the liquid in accordance with
the liquid level changes, the liquid forming a
portion of the electrical capacitance, a non
in
conducting support for said electrode surround
ing the same, the enclosure being provided with
oscillating circuit including said electrode, the
an opening and a pressure seal therein for said
electrode and support, a grid tank unit mounted
mounting for the grid tank unit including an
annular member surrounding said unit and
electrode and having heat radiating ?ns for pre
outside said enclosure in spaced relation there
with, and forming an oscillating circuit includ
ing said electrode, the mounting for the grid
venting heat from interfering with the prede
termined characteristics of said unit.
tank unit including an annular member sur
rounding said unit and electrode and having
means for preventing heat from interfering with‘
closure having an inner conducting surface
the predetermined characteristics of said unit.
adapted to contain liquid at a predetermined 20
THEODORE A. COHEN.
3. The combination of a high pressure en
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