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Патент USA US2110672

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7 March 8, 1938.
I
2,110,672
o. MAYR
ELECTRIC CIRCUIT INTERRUPTER
Filed March 6, 1957
'
lnventor'
Ott Q Magr',
by 1/
6:1]
H S Attorney
Patented Mar. 8, 1938
2,110,672
UNITED STATES
PATENT OFFICE
2,110,672
ELECTRIC CIRCUIT INTERRUPTER
Otto MayrIBerlin-Karlshorst, Germany, assignor
to General Electric Company, a corporation of
New York
Application March 6, 1937, Serial No. 129,422
In Germany March 23, 1936
'
4' Claims. - (c1. zoo-149)
This invention relates to electric circuit inter
the following description referring to the accom
rupters, more particularly to the expulsion type
panying drawing, and the features of novelty
wherein automatic generation of an arc-extin~
guishing gas takes place in accordance with the
which characterize my invention will be pointed
out with particularity in the claims annexed to
5 circuit opening operation.
In the operation of electric switches or cir
cuit breakers of the gas-expulsion type, for ex
and forming a part of this‘ speci?cation.
Referring to the drawing the single ?gure
thereof is an elevational'view, partly in section,
ample, wherein an arc-extinguishing gas is re— 7 of an electric circuit interrupter of the gas-ex
leased from the walls of the arc chamber under
'10 in?uence of the arc heat, there is often'encoun
tered di?iculty’ in interrupting both large and
small currents with equal facility. “Phat is, since
the amount of extinguishing gas generated de
pends, among other things, on the intensity of
15 the arc current, the‘size of the arc chamber is
generally a compromise between the optimum for
low current and high current interruptions. If
the capacity of the arc chamber is selected so that
an effective gas expulsion takes place at low ‘cur
20 rents for interrupting the arc, the pressure gener
ated during the interruption of a high current
are may be so great as to burst the chamber
casing. Converselyyif the capacity of the arc
chamber is increased so as to provide for the
25 larger amount of gas generated during interrup
tion of a high current- arc, the expulsion effect
at low currents may be so- weak that the arc is
not interrupted.
'
i
The principal object of myinvention is the
30 provision of .an improved circuit interrupter of
the aforesaid type which is e?icient and positive
pulsion ‘type embodying the present invention.
The circuit interrupter shown by way of ex
ample is an expulsion type switch in the open
circuit position. ‘ The switch or circuit breaker
comprises essentially an extinguishing tube I or
an equivalent structure forming an, arc-inter
rupting chamber I’ centrally of the tube. The 15
tube I, or the walls of the arc chamber, is com
posed of a gas-yielding material such as, for ex
ample, ?ber or hard rubber so that an arc-inter
rupting gas is generated within the arc chamber
when the chamber walls are subjected to therarc. M 0
The closed end of the arc chamber I’ is located
adjacent the ?xed contact structure 2, which is
shown as of the segmental type, suitably mount
ed within a stationary terminal housing 3. The
coacting movable contact comprises a rod 4 mov
able through the open or gas exhaust end of the
arc chamber into engagement with the ?xed
contact 2. The tube I is suitably secured. to the
?xed housing 3 in any suitable manner, such as
by screw-threaded engagement.
The closed end of the arc chamber I’ is de-
in operation throughout its entire rated range ' ?ned by a movable wall portion 5 which is oper
of interrupting capacity, and simple and durable
in construction.
35
'
.
In accordance with my invention in a simple
form thereof an arc-extinguishing chamber is
provided with a wall portion which is movable
in response‘to predetermined pressure within the
arc chamber for automatically regulating the
- 40 pressure of the arc-extinguishing gas during in
terruption of currents throughout the rated range
of the interrupter. In a preferred arrangement
the movable wall portion is formed as a piston
normally biased by a‘ spring or the equivalent
4-5 thereof so as to de?ne a minimum arc-chamber
volume. Predetermined arc pressure generated
within the chamber is effective to move the pis
ton against the biasing force so as to enlarge the
arc chamber and thereby reduce bursting pres
50 sures during interruption of high current arcs.
I 55
able within a chamber 6 in the terminal housing
3 and suitably biased by a spring ‘I into engage
ment with the ?xed contact structure 2. In this
position the movable wall portion, which in the
present instance is formed as a piston, de?nes an
arc chamber of minimum volume for the inter
ruption of light or medium currents. That is,
during the interruption of small or medium cur 40
rents the piston 5 remains in the position shown
and the are drawn between the contacts 2 and
4 acts on the inner walls of the chamber I’ to
release the arc-extinguishing gas. When the
rod contact 4 leaves the lower exhaustMend of
the chamber a gas blast takes place which inter
rupts the are.
i
‘
.1
When comparatively large currents are to be
interrupted, the chamber 6 serves as a compres
sion chamber and the_gas pressure generated
In the normal position of therpiston, the restricted ' within the arc chamber I’ forces the piston 5
volume of the .arc chamber is such that small or
upwardly against the bias of spring I to enlarge
medium currents are effectively interrupted by the volume of the arc chamber, thereby reducing
the gas pressure generated. therein.
the bursting pressure. A vent 8 can also be pro
.My invention will be more fully 'set forth in vided in the compression chamber 6, and if de
2
$23,110,672
sired, may be formed as an adjustable throttle
the aforesaid arc ‘chamber in response to prede
opening.
termined gas pressure generated within said arc
This-permits a certain degree of ad- .
justment in regulating the pressures to be re
lieved in accordance with the circuit-interrupt
ing requirements of the switch.
'
»
A further advantage of’ the movable chamber
wall as arranged in accordance with the present
invention is that the energy stored in the spring
ll during the initial circuit opening movement is
returned. in the form or“ an augmented gas blast
when the movable switch rod ll clears the exhaust
end of the arc chamber l’. The piston, therefore,
in returning to its-original position serves to aid
chamber upon separation of said contact struc
ture, and means forming an expansion chamber
within which said piston-like member operates,
said member being biased to return gas under
pressure to said are chamber for aiding interrup
tion during the latter part of the circuit-opening
operation.
-
3. An electric circuit interrupter of the gas
expulsion type comprising a ?xed and a movable
rod contact, an insulating cylinder forming an
arc chamber through which said rod contact is
movable for coacting with the other contact, said
final interruption of the arc.
.
It should be understood that my invention is chamber having walls composed of a material
15
not limited to speci?c details of construction and adapted to emit an arc-extinguishing gas when
arrangement thereof herein illustrated, and that subjected to the arc formed upon separation of
changes and modi?cations may occur to one said contacts, said contacts arranged to sepa
skilled in the'art without departing from the rate at one end of said chamber, means forming
an expansion chamber at said one end of said
20 spirit of my invention;
chamber, and a piston forming a con?ning wall
‘ What I claim as new and desire to secure by
portion of said are chamber operable in the afore
Letters Patent" of the United States, is:
said expansion chamber normally biased so as
1. An electric circuit interrupter of the gas
expulsion type comprising means for opening the to restrict the volume of said chamber, said piston
25 circuit, insulating structure de?ning a chamber being movable into said expansion chamber to 25
having an exhaust opening within which an arc
is formed upon opening of the circuit, said
chamber having wall portions composed of a
, material adapted to emit an arc-extinguishing
30 gas when subjected to said are, means forming a
pressure resisting movable wall portion of said
chamber, said wall portion being movable in a
direction to increase the volume of said chamber
~ substantially independently of the exhaust there
35 from in response to predetermined gas pressure
generated within said chamber, and means coact
increase the volume of said arc chamber in re
sponse to predetermined gas pressure generated
during separation or said contacts, and operable
to return gas under pressure to said arc chamber
for aiding interruption when the arc pressure has 30
decreased a predetermined amount.
a. An electric circuit interrupter of the gas
expulsion type comprising a ?xed contact and a‘
coacting movable rod contact, an‘insulating tube
having a sleeve-like ?t with respect to said rod 35
contact through which said contact is operable
ing with said movable wall portion forming an
to engage said ?xed contact at one end of said
expansion chamber, from which gas is returned '
biased so as to restrict the volume of said cham
tube, said tube forming an arc chamber having
walls composed of a material adapted to emit an
arc-extinguishing gas when subjected to the are 40
formed upon separation of said contacts, means
substantially closing the end of said tube adjacent
said ?xed contact, a piston member disposed
within said closing means adjacent said end of
said tube, said piston being normally biased so as 45
to restrict the volume of said are chamber, said
piston being movable ‘in opposition to said bias to
ber, said chamber also having wall portions com
increase the volume of said arc chamber in re
to said are chamber by said wall portion during
40 the latter part of the circuit-opening operation.
2. An electric, circuit interrupter of the gas
expulsion type comprising relatively movable con
tact structure, an insulating cylinder forming an
arc chamber co-operating with said contact struc
ture, a .i piston-like member forming a con?n
ing wall portion of said are chamber normally
posed of a material adapted to emit an arc
50 extinguishing gas when subjected to the arc, said
member being movable in a direction to enlarge
sponse to predetermined gas pressure generated
within said chamber.
OTTO MAYR.
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