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Патент USA US3084284

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April 2, 1963
Filed March 1. 1960
Raul (Sc/made)"
United States Patent 0 ” "Ice
Patented Apr. 2, 19$3
ing 12 which establishes a communication between the
interior and exterior of casing 7. The top of casing 7
Paul Schneider, Turgi, Switzerland, assignor to Aktien
gesellsclzaft Brown, Boveri & Cie, Baden, Switzerland,
a joint-stock company
Filed Mar. 1, 1960, Ser. No. 12,179
Claims priority, application Switzerland Mar. 4, 1959
6 Claims. (Cl. 313—152)
bears against a depending stop pin 8 which is adjustable
in effective length and acts as a stop for the casing 7
so as to space the top of the latter from the top of cham
ber 10 and hence from the entrance to nozzle 4. Cas—
ing 7 serves as a ?oating cylinder for an iron core .pis
ton 6 disposed therein and which latter constitutes an
armature element which is pulled down within cylinder
The invention concerns ignition devices for mercury 10 7 whenever coil 5 is energized.
vapour current converters which by magnetic actuation
It will be seen from
the drawing, that the external diameter of cylinder 7 is
less than the diameter of chamber 10 so that cylinder
an ignition anode arranged above the surface of the
7 as it ?oats in the mercury is free to move in all direc
tions. Located in the lower part of cylinder 7 are a plu
Arrangements for this purpose are known which op— 15 rality of openings 9 extending laterally through the Wall
thereof. These openings 9 lie so high above the ?oor
erate magnetically. With these an armature or core is
of chamber 10 that the mercury remaining below these
retracted by means of a magnetic coil. This core then
openings as armature piston 6 is pulled downward serves
presses against a mercury column which is in communi
to dampen movement of the piston.
cation with the mercury at the cathode and thus splashes
When it is desired to ignite the converter, magnet coil
mercury away from the cathode which is brought into 20
5 is energized. This causes the armature piston 6 to be
contact with an ignition anode. For this purpose the
pulled down within cylinder 7 to thus force the mercury
core is located in a tube which is rigidly ?xed to the eas
of an iron core splash the mercury from the cathode to
ing of the converter, the end of the tube being provided
within cylinder 7 outwardly through openings 9 into
chamber 10 and hence force mercury upward and out
with a nozzle. The core forces the mercury through the
tube to the nozzle where it is ejected. When the mer 25 wardly from chamber 10 through nozzle 4 at consid
erable velocity thus causing mercury to be squirted onto
cury ?ows back, the core is returned to its initial posi
the ignition anode 3. The magnet coil 5 can then be
tion. Since the density of the iron core is less than that
deenergized whereupon the armature piston 6 rises once
of the mercury the core is buoyed by and ?oats on the
again within cylinder 7 to the initial position shown in
mercury when it is out of operation. The core has there
fore to be pulled downwards by the magnet. In order 30 the drawing and presses out through the aperture 12 any
mercury which may have collected between the upper end
for the mercury to be ejected in the upward direction,
it is necessary for the tube to be Uashaped, whereby
of piston 6 and top of cylinder 7, the piston coming to
the magnet with the core is located at one end and the
rest against the top of cylinder 7.
The entire arrangement serves the purpose of prevent
ing impacts from the core 6 being transmitted to the
nozzle at the other end.
It is also possible to have an arrangement where the
tube with the nozzle dips into a vessel containing mer
cury on which a magnet core ?oats.
The mercury is
then pressed from the vessel into the tube. Here also
casing ‘1.
Since the cylinder 7 actually ?oats in the
mercury it can readily move in all directions and is there
fore resilient as regards impacts without any par-ts con
nected to the casing 1 being touched. The lower mer
the tube and the vessel with the core are joined rigidly
to the converter casing. The disadvantage of this ar 40 cury sump prevents any impacts reaching the floor.
The tightness of the. entire arrangement is not in
rangement is that due to the impact of the core, me
chanical forces can be transmitted to the converter cas
ing and as a result leaks may occur which in time may
affect the vacuum in the current converter.
?uenced or affected by the operation of the ignition de
I claim:
in which the mercury 2 in the form of a pool forms the
cathode. The ignition anode 3 lies above the mercury
55 of said housing de?ning said chamber so as to be free
1. In a jet ignition device for mercury arc converters
In accordance with the invention it is therefore pro 45
of the type including a mercury pool type cathode and
posed to provide an auxiliary casing in which the iron
an ignition anode, the combination comprising a housing
core is located and that this auxiliary casing should also
arranged below the mercury pool and ignition anode, said
?oat in the mercury and have openings through which
housing establishing therein a mercurysi?lled chamber, an
the mercury is forced into a further chamber in com
electrornagnet coil surrounding said housing and chamber,
munication with the nozzle, the wall of this chamber
a nozzle disposed at the upper end of said chamber, the
being rigidly connected to the casing of the current con
discharge outlet from said nozzle being located in said
mercury pool beneath said ignition anode, a casing dis
A constructional example is shown in FIG. 1. Ref
posed within said chamber and spaced from the walls
erence number 1 indicates the current converter casing
cathode pool. Depending from the bottom of easing 1
?oating in the mercury contained Within the same, the
lower portion of said casing including at least one dis
charge opening to said chamber, and an iron core ar
is a tubular extension 1a in the form of a separate part
ranged as a piston within said casing above said dis
which is secured to the main casing 1 at the points 11.
charge opening whereby said core will be pulled down
Surrounding the tubular extension ‘1a is a magnet coil
wardly within said casing upon energization of said elec~
5 which is adapted to be energized from a suitable source
trornagnet coil to force mercury from within said casing
of current whenever it is desired to ignite the converter.
‘outwardly through said discharge opening into said cham
The interior of the tubular extension 1a forms a well
ber and thereby force mercury from the upper end of said
or chamber 10 below the main mercury pool 2 and
chamber through said nozzle.
within which mercury from pool 2 collects and ?lls the
2. A jet ignition device as de?ned in claim 1 for mer
same, the mercury entering the chamber 10 through a
cury arc converters wherein said discharge opening at the
nozzle 4 located at the upper end of the tubular exten
lower portion of said casing is arranged laterally through
sion 1a and directly beneath the ignition anode 3. Ar
ranged to ?oat within the, mercury ?lled chamber 10 is 70 the casing wall and at such a height that the part of the
mercury below said opening serves to dampen further
a tubular casing 7 which is'open at the bottom and closed
downward movement of said core.
at the top except for a small bore vertical discharge open
3. A jet ignition device as de?ned in claim 2 wherein
the lower end of said casing is open to said chamber in
addition .to said lateral discharge opening.
4. A jet ignition device as de?ned in claim 1 and which
further includes a stop pin disposed within ‘said chamber 5
at the upper end thereof‘, said pin constituting a stop for
the upper end of said casing and said iron core within the
sarne when said eleetromagnet coil is not energized.
5. A jet ignition device as de?ned in claim 4 wherein
saidv stop pin is adjustable as regards its e?ective length‘ 10
to thereby effect an adjustment in the damping action.
' 4
6. A jet ignition device as de?ned in claim 1 and where
in .the upper end Wall of said casing includes an aperture
therethrough communicating with said chamber.
References Cited in the ?le of this patent
Jonas _______________ __ Nov. ll, 1930‘
Hurlimann __________ ..___ Dec. 21, 19,37
Great Britain _________ _- July 29, 1959
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