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Патент USA US2116383

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May 3, 1938.
‘2,116,383
' e. cARLsoN
LIQUID CONTACT CIRCUIT CLOSER
Filed March 11, 1957
Irwvemtori:
Ge oT‘geK/Car 5 oh ,
by 791M763
MZW
His Attorney
2,116,383
Patented May 3, 1938
.I UNITED STATES PATENT “OFFICE
2,116,383
LIQUID CDNTACT CIRCUIT CLOSER
George Carlson, Bridgeport, Conn., assignor to
General Electric Company, a corporation of
New York
Application March 11, 1937, Serial No. 130,261
5 Claims.
The present invention relates to liquid con
tact circuit closers. The object of my invention
is to provide an improved construction and ar
rangement in liquid contact circuit closers which
increase the interrupting capacity, and for a
consideration of what I believe to be novel and
my invention, attention is directed to the ac
companying description, and the claims append
(or. 200-452)
cuit interrupting position the circuit between the
terminals is broken between the retained portion
II of the mercury and the mercury flowing from
each of the‘ openings 8 and 9. This provides a
double break which increases the interrupting
capacity of the circuit closer. When the circuit
closer is returned to the position shown in Fig. 2,
the mercury ?ows into each of the openings 8
and 9 and joins with the pool II to complete the
ed thereto.
a
In the accompanying drawing, Fig. 1 is a‘ circuit between the terminals. Due to the sur
side elevation, partly broken away, of a liquid
contact circuit closer embodying my invention,
face tension of the mercury, there is an are be
tween the particles of mercury during joining
which is of longer duration than the arc during
ing position. Figure 2 is a similar view of the the separation of the mercury to interrupt the
circuit. The are during joining of the mercury
- circuit closer, it being in the circuit closing po
is
also decreased by the presence of the pool lI'.
' sition, and Fig. 3 is a sectional view taken on‘
Another advantage resulting from the presence
line 3-3 of Fig. 1. ‘
Referring to the drawing, I have illustrated of the pool I I is a decrease in wear due to erosion
my invention applied to a liquid contact circuit of "the ceramic in the passage - de?ned by the
openings 8 and 9. This wear is due'to seepage
closer having a pair of cup-shaped metal termi
nals I which are separated by a diaphragm of particles of mercury into the interstices of the
ceramic and to subsequent arcing of these par
comprising abutting plates 2 and 3 of a refrac
tory material, vsuch as a ceramic. The outer ticles which causes the particles of mercury to be
- edges of the plates 2 and 3 are provided with forced out of the interstices with an explosive
shoulders 4 for receiving the ?anges 5 of the e?ect. Since ceramics are all porous, this type
terminals. The ?anges 5 are sealed by a head of wear is always present when thediaphragm is
a ceramic. The present construction decreases
6 of glass which also seals the junctions be
tween the ?anges vSand the plates 2 and 3 and this ‘type of wear since the arcing tends‘ to be con
the junction between the plates 2 and 3. Within ?ned to the edges of the pool II.
It will be noted that the shape-of the depres
the space enclosed by the terminals is a suitable
sion III is such that it holds an increasing amount
quantity of mercury ‘I which forms the conduct
of mercury as the circuit closer is'moved to the
ing medium between terminals. In the manu
facture of the circuit closer the space enclosed interrupting position. As the circuit closer is
by the terminals is evacuated and ?lled with hy _moved to the circuit interrupting position there
is therefore a flow of mercury into the depression
5) drogen at a pressure of one or more atmospheres
III which aids the separation of the mercury.
which increases the current interrupting ca
pacity of the circuit closer. The diaphragm is During movement of the circuit closer to the cir
provided with a passage formed by openings 8 cuit closing position, there is a flow of mercury
and 9 in the plates 2 and 3. As shown in Figs. from the depression III which aids the joining of
.the mercury.
‘
40 1 and 2 this passage is submerged in the mer
In the use of the circuit closer the circuit closer
cury when the circuit closer is in the current
is rotatably supported for rotation about the axis
conducting position and is raised out of the mer
of its terminals in such a manner that the pas~
cury when the circuit closer is in the circuit in
terrupting position. The passage formed by the sage de?ned by the openings 8 and 9 is horizon
tal. By rotation of the circuit closer through a
45 openings. Band 9 is arranged so that as the cir
cuit closer is moved from the circuit closing to small angle the circuit closer may be moved to
the circuit interrupting position mercury ?ows the circuit closing and circuit interrupting posi
tions shown in Figs. 1 and 2. As the circuit
‘ simultaneously from each end of the passage. In
closer is moved from the circuit closing position
the abutting faces of the plates 2 and 3 are re
cesses forming a depression ‘III in thepassage to the circuit interrupting position the circuit be
tween the terminals is interrupted between the
.formed by the openings 8 and 9. This depres
the circuit closer being in thecircuit interrupt
sion is arranged so that as the circuit closer is
moved to the circuit interrupting position a por
, tion ll of the mercury is retained in the depres
55 sion.
As the circuit closer is moved to the cir
mercury ?owing from each end of the passage de
?ned by openings 8 and 9 and theportion II of
the mercury retained in the depression III. The
circuit interruption, therefore, takes place en
5
0
b) 5
40
45
2
9,116,888
tirely in the mercury and since it is interrupted
in a plurality of places the circuit interrupting
capacity of the switch is increased.
I have shown the diaphragm between the ter
minals from two abutting plates of insulating
material. It is obvious that a greater number
of plates could be used and that by providing a
mercury retaining depression between each pair
of plates thev interrupting capacity of the circuit
10 closer could be further increased.
'What I claim as new and desire to secure by
Letters Patent of the United States, is:—
-
1. In a liquid contact circuit closer, an envelope
having an electrically conducting liquid therein,
15 a diaphragm separating the liquid into two pools,
a terminal contacting the liquid on each side of
the diaphragm, a passage through the diaphragm
for connecting said pools to complete a circuit
between the terminals, said passage being ar
20 ranged so that the liquid ?ows simultaneously
two pools, said diaphragm comprising a plurality
oi.’ abutting plates, a terminal contacting the liq
uid on each side of the diaphragm, openings in
said plates providing a passage through the dia
phragm for connecting said pools ‘to complete a
circuit between the terminals, said passage being
arranged so that the liquid ?ows simultaneously
from each end ‘thereof as the circuit closer is
moved to a circuit interrupting position in which
the passage is raised above the liquid level in the 10
envelope, and a recess in the abutting face of 'one
of said plates providing a depression in said pas
sage between its ends for retaining a portion of
the liquid as the circuit closer is moved to the cir
' cuit interrupting position whereby the circuit is 15
broken from each side of the retained liquid, said
depression being constructed so that the liquid
., retained therein is raised above the liquid level in
.the envelope as the passage is raised above the
liquid level.
from each end thereof as the circuit closer is
4. In a liquid contact circuit closer, an envelope
moved to a circuit interrupting position in which having an electrically conducting liquid therein,
the passage is raised above the liquid level in a diaphragm separating the liquid into two pools,
the envelope, and a depression in said passage a terminal contacting the liquid on each side of
25 between its ends for retaining a portion of the
the diaphragm, a passage through the diaphragm
liquid as the circuit closer is moved to the circuit for connecting said tools to complete a circuit be
interrupting position whereby the circuit is tween the terminals, said passage being arranged
broken from each side of the retained liquid, said so that the liquid ?ows simultaneously from each
depression being constructed so that the liquid end thereof as the circuit closer is moved to a
retained therein is raised above the liquid level circuit interrupting. position, and a depression in
in the envelope as the passage is raised above the said passage between its ends for retaining a por
liquid level.
tion of the liquid as the circuit closer is moved to
the circuit interrupting position whereby the cir
2. In a liquid contact circuit closer, an -en
velope for an electrically conducting liquid com
cuit is broken from each side of the retained liq
36 prising a pair of opposed cup-shaped metal termi
uid, said depression being shaped so that the vol
nals, a diaphragm between the adjacent edges of ume of liquid held therein increases as the circuit
said terminals, said diaphragm comprising a plu
closer is moved from the circuit closing to the cir
rality of abutting plates, a bead of sealing ma
cuit interrupting position.
terial joining said terminals and sealing the
5. Ina liquid contact circuit closer, an envelope
40 junction between said plates, openings in said having a quantity of mercury therein, a barrier
plates providing a. passage through the dia
separating the mercury into two pools, a termi
phragm for completing a circuit between the nal contacting the mercury on each side of the
terminals, said passage being arranged so that barrier, a passage over the barrier for connecting
the liquid ?ows simultaneously from each end said pools to complete a circuit between the ter
45 thereof as the circuit closer is moved to a circuit minals, said passage being arranged so that the
interrupting position in which the passage is mercury ?ows simultaneously from each end
raised above the liquid level in the envelope, and thereof as the circuit closer is moved to a circuit
a recess in the abutting face of one of said plates interrupting position in which the passage is
providing a depression in said passage between raised above the liquid level in the envelope, said
50 its ends for retaining a portion of the liquid as
the circuit closer is moved to the circuit inter
rupting position .whereby the circuit is broken
from each side of the‘retained liquid, said depres=
sion being constructed so that the liquid retained
55 therein is raised above the liquid level in the en
velope as the passage is raised above the liquid
level.
3. In' a liquid contact circuit closer, an enve
lope having an electrically conducting liquid
therein, ‘a diaphragm separating the liquid into
20
~
.
25
30
35
40
45
passage having a ceramic surface over which the
mercury ?ows, and a depression in said passage 50
between its ends for retaining a portion of the‘
mercury as the circuit closer is moved to the
circuit interrupting position whereby the circuit is
broken from each side of the retained mercury,
said depression being constructed so that the liq 55
uid retained therein is raised above the liquid
level in the envelope as the passage is raised
above the liquid level.
j,
_
‘
GEORGE CARLSON.
eERTJFIcA'TE 0F CORRECTION.
Patent
-
'
No.
‘
2,116,585.
‘
-
GEORGE
'
'
_‘
'
I
‘ .
may 5;»
1959»
‘
‘
.
cABLsoN.
It is hereby ‘ certified‘ that‘ error- appears gin the- print ed specification
of the above numbered patent‘requiringeor'renationv as follows: Page 2, second‘
‘column, line 26, claim 14., for the word "tools" read pools; andthat the
said Letters Patent. should be read with thier‘correction therein that the
same may conform to the, record of, the case in Nae Patent Office.
Signed. and sealed thie'lhth ‘day of J1me, A., D. 1938'.
'
Henry Van Arsda-le ,
' (Seal?
:Acting cennnissioner of Patents.‘
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