EP0169290B1 - Vorrichtung für den Einsatz in der Entgasung von geschmolzenem Metall - Google Patents

Vorrichtung für den Einsatz in der Entgasung von geschmolzenem Metall Download PDF

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Publication number
EP0169290B1
EP0169290B1 EP84810534A EP84810534A EP0169290B1 EP 0169290 B1 EP0169290 B1 EP 0169290B1 EP 84810534 A EP84810534 A EP 84810534A EP 84810534 A EP84810534 A EP 84810534A EP 0169290 B1 EP0169290 B1 EP 0169290B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
clamping plate
seal
nozzle body
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP84810534A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0169290A2 (de
EP0169290A3 (en
Inventor
Robert E. Hershey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3A Composites International AG
Original Assignee
Schweizerische Aluminium AG
Alusuisse Lonza Services Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schweizerische Aluminium AG, Alusuisse Lonza Services Ltd filed Critical Schweizerische Aluminium AG
Priority to AT84810534T priority Critical patent/ATE51067T1/de
Publication of EP0169290A2 publication Critical patent/EP0169290A2/de
Publication of EP0169290A3 publication Critical patent/EP0169290A3/de
Application granted granted Critical
Publication of EP0169290B1 publication Critical patent/EP0169290B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor

Definitions

  • the present invention relates to an apparatus for use in degassing molten metal in a swirl chamber and to a nozzle unit for introducing gas.
  • the vortex flow reactor comprises a vortex chamber with an upper, substantially cylindrical section and a funnel-shaped section adjoining the upper section with an inner wall and an outer wall, which is arranged at a distance from the inner wall.
  • Inlet nozzles for purge gas are provided at different heights on the funnel-shaped section in order to achieve an optimal distribution of the purge gas bubbles over the entire melt when flowing through from the reactor inlet to the reactor outlet. Since the nozzles are arranged at different heights in the converging wall section, the flushing gas nozzles are also at different distances from the central axis of the vortex flow reactor, as a result of which a maximum distribution of the flushing gas bubbles is achieved.
  • US Pat. No. 4,392,636 describes a gas inlet nozzle for use in a vortex flow reactor according to US Pat. No. 4,177,066.
  • the design of the gas nozzle comprises a nozzle insert which is arranged in the wall of the vortex flow reactor and is flush with the inside of said wall.
  • the nozzle insert has a contact surface for receiving a conical nozzle tip made of ceramic or similar material.
  • the purging gas nozzle is pressed against the conical nozzle tip under spring pressure, in order to seal the nozzle against the conical tip and this against the nozzle insert, so that no metal escapes from the reactor in the region of the purging gas nozzle.
  • the purge gas nozzle is connected to the purge gas supply line via a nozzle screw connection with a seal between the screw connection and the purge gas nozzle. It has been shown that the rotational movement of the nozzle screw connection on the seal between the screw connection and the purge gas nozzle is disadvantageous for an effective seal. Since the vortex flow reactor is used to separate hydrogen and alkaline earth metals from molten aluminum and thereby active gases such as Chlorine or similar used, it is an absolute necessity to provide a really tight version for the purge gas supply.
  • An important object of the present invention is to provide a gas inlet nozzle in an improved version for use in a vortex flow reactor for degassing molten metal, in which there are no gas leaks between the nozzle screw connection and the purge gas nozzle.
  • Another object of the present invention is to provide an improved gas inlet nozzle using the aforementioned improvement which is easy to handle and is not expensive.
  • the present invention includes the improved design of a gas inlet nozzle for use in a vortex flow reactor for degassing molten metal using a purge gas.
  • the purge gas nozzle comprises a nozzle insert, which is arranged in the wall of the vortex flow reactor and is flush with the inside of the wall.
  • the nozzle insert has a support surface for receiving a conical nozzle tip made of ceramic or similar material.
  • the purging gas nozzle is pressed against the conical tip in a spring-loaded manner in order to seal the nozzle against the conical tip so that no metal escapes from the reactor in the area of the purging gas nozzle.
  • the purging gas nozzle is connected to the purging gas supply line via a nozzle screw connection which comprises a nozzle nut for receiving the nozzle body.
  • the nozzle nut receives a clamping plate which presses against a seal which is provided between the clamping plate and the rear of the nozzle body.
  • a screw with an external thread is picked up by the thread of the nozzle nut and presses the clamping plate against the seal and accordingly against the nozzle body in order to ensure a complete seal.
  • a spring washer can be provided between the clamping plate and the screw with an external thread in order to support the pressing of the clamping plate.
  • Said device for holding said clamping plate in a non-rotatable design can comprise at least one cutout in said nozzle nut, which receives a projection on said clamping plate.
  • a gas supply pipe can be firmly connected to the clamping plate.
  • the invention also includes a nozzle unit having a nozzle nut, a nozzle body held by said nozzle nut and a clamping plate, a seal having a first section which bears against said nozzle body for complete sealing, and a second section which bears against said one for complete sealing Clamping plate is present, a device for pressing said clamping plate in a non-rotating design against said seal, and a screw which is connected to said nozzle nut such that said clamping plate is pressed against said seal and said seal against said nozzle body .
  • a spring washer can be provided between said clamping plate and said screw.
  • Said device for holding the clamping plate in the nozzle unit can comprise, in a non-rotatable embodiment, at least one cutout in said nozzle nut, which receives a projection on said clamping plate. Furthermore, a gas supply pipe can be firmly connected to the clamping plate mentioned.
  • the flushing gas nozzle unit rests in a mounting bracket which is rigidly connected to the outer wall of the vortex flow reactor.
  • the holder is designed so that the nozzle unit can be easily removed and replaced in the event of a blocked nozzle tip or wear of the conical nozzle tip or in a similar case.
  • Fig. 1 shows the built-in purge gas nozzle on the preferred embodiment of a vortex flow reactor 10 with an upper, essentially cylindrical section 12 and a lower, funnel-shaped section 14, which directly adjoins the upper section 12.
  • the purge gas nozzle in the context of the present invention can be installed in all of the vortex flow reactors described in US Pat. No. 4,177,066, and the specific details of the design of the aforementioned vortex flow reactors are therefore referred to herein.
  • a number of gas inlet nozzle units are fastened to the outer wall 20 of the funnel-shaped section 14 with the aid of the mounting frame 16. With particular reference to Figs. 2-4, the details of the design of the gas inlet nozzle and the mounting frame are described in detail.
  • Fig. 2 shows the funnel-shaped section 14 of the vortex flow reactor with an inner wall 18 made of a suitable, refractory material and an outer wall 20, preferably made of steel, with a space to the inner wall 18.
  • the space 22 between the inner wall 18 and the outer wall 20 is preferably with suitable insulating material.
  • the outer wall 20 is equipped with a number of flange plates 24, the number of which depends on the number of nozzles provided on the vortex flow reactor.
  • the flange plates 24 have an opening 25 for receiving a nozzle unit and can either be integrated into the wall 20 or arranged at a distance from the wall 20 and fastened in a corresponding cutout in the wall 20 by welding or a similar method.
  • the flange plates 24 each have a number of bolts 26 which are provided in the flange plates 24 Holes 28 are secured by welding or a similar process.
  • the vortex flow reactor 10 has, as already mentioned, a number of purge gas nozzle units 60.
  • All of the nozzle units mentioned are fastened via an outer ring 30 to a flange section 32 and an upstanding section 36, the flange section 32 having a number of holes 34 for securing the outer ring 30 to the screw bolts 26.
  • the outer ring 30 is optionally placed over the bolts 26 with a lock over the nuts 38 and spring washers 40 with respect to each flange plate 24, in order to be able to regulate the contact pressure on the nozzle unit, as described in more detail hereinafter.
  • the inner wall 18 is provided with a number of passage openings 42 corresponding to the arrangement and number of openings 25 in the flange plates 24.
  • a nozzle insert 44 with a passage 46 and a conical bearing surface 48.
  • the nozzle inserts 44 are fastened in the passage openings 42 of the inner walls 18 by means of mortar and consist of suitable, fire-resistant material such as e.g. Silicon carbide or the like.
  • a conical nozzle tip 50 with a conical surface 52 is inserted, which is designed such that it brings about a complete seal with the contact surface 48 of the nozzle insert 44.
  • the conical nozzle tip 50 is preferably made of vacuum molded FIBERFRAX material (FIBERFRAX is a trademark of Harbison-Carborundum Corp. for alumina and silica ceramic fiber) which, under appropriate pressure, provides a complete seal between the conical surface 52 on the conical nozzle tip 50 and the bearing surface 48 of the nozzle insert 44 provides.
  • the conical nozzle tip 50 has a passage 54 with a bearing surface 58, which is designed in such a way that it effects a complete seal against the conical surface 64 of the nozzle body 62 of the nozzle unit 60.
  • the nozzle unit 60 comprises a nozzle body 62 with a passage 66 and a mouthpiece profile 68 behind the passage 66.
  • the nozzle body 62 is secured by a nozzle nut 72 which has two cutouts 76.
  • the clamping plate 73 with two ear-shaped projections 75 rests in the nozzle nut 72 such that the ears 75 engage in the cutout 76, so that the clamping plate 73 is held in the nozzle nut 72 in a non-rotating design.
  • a seal 78 is provided between the clamping plate 73 and the rear surface 70 of the nozzle body 62 in order to seal the clamping plate 73 against the nozzle body 62 in a gas-tight design.
  • a gas supply pipe 82 attached to the clamp plate 73 by welding or a similar method, communicates with the opening 79 in the clamp plate 73.
  • a screw 74 with an external thread which is designed such that it can be received by the nozzle nut 72 via the external thread 84 in order to press the clamping plate 73 against the seal 78, has a passage 80 for receiving the gas supply pipe 82.
  • the coupling 83 connects the gas hose 85 with the feed pipe 82.
  • a spring ring 77 can be provided between the clamping plate 73 and the screw 74 with an external thread.
  • the seal 78 can be a metal seal, but a metal impregnated graphite seal should preferably be used.
  • the nozzle unit 60 rests in the passage 54 of the conical nozzle tip 50 such that the conical contact surface 64 of the nozzle body 62 is pressed against the contact surface 58 of the conical nozzle tip 50 with the aid of the inner ring 86 and the nozzle compression spring 88.
  • the inner ring 86 has a passage 90 with an undercut portion 92 to receive one side of the nozzle compression spring 88, the other side of which rests against the rear wall 93 of the screw unit 74.
  • the inner ring 86 is provided with a number of arms 94 attached thereto which are designed to be securely received by the slots 96 provided in the upstanding portion 36 of the outer ring 30.
  • the nozzle compression spring 88 which bears against the undercut surface 92 at the passage 90 in the inner ring 86, presses against the rear wall 93 of the screw 74 with an external thread, around the nozzle unit and in particular to press the conical bearing surface 64 of the nozzle body 62 against the sealing surface on the conical nozzle tip 50 for complete sealing.
  • the pressure exerted by the spring 88 on the nozzle unit 60 can be varied by changing the position of the outer ring 30 with respect to the flange plate 24 in that the outer ring 30 is brought into different positions on the screw bolts 66 by means of the nuts 38 and the spring rings 40 becomes.
  • a nozzle unit and a mounting frame prevents molten metal from escaping from the reactor in the region of the nozzle body 62.
  • the provided screw 74 with external thread, nozzle nut 72, clamping plate 73, seal 78 and nozzle body 62 prevent gas leaks in the purge gas supply line.
  • the nozzle bodies do not protrude into the interior of the vortex flow reactor, damage to the nozzle bodies by the action of the molten metal and by cleaning the inner walls of the reactor are prevented.
  • the mouthpiece profile 68 of the nozzle body 62 can, as mentioned above, either consist of an opening with a straight passage and a constant diameter or have a converging / diverging profile.
  • the diameter of the straight passage section should be made as small as possible in order to to prevent clogging of the mouthpiece profile by molten metal.
  • the mouthpiece size can be between 0.127 mm and 1.905 mm, but should preferably be 0.254-1.27 mm.
  • the converging section should form an angle of approximately 10 ° -60 ° with the axis of the nozzle, if possible, but preferably 20 ° -40 °.
  • the diverging section should form an angle between approximately 1 ° and 8 ° with the axis of the nozzle, but preferably 2 ° and 4 °.
  • the transition between the converging and diverging sections must be designed as a smooth surface without abrupt changes in angle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)
EP84810534A 1983-11-16 1984-11-05 Vorrichtung für den Einsatz in der Entgasung von geschmolzenem Metall Expired - Lifetime EP0169290B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84810534T ATE51067T1 (de) 1983-11-16 1984-11-05 Vorrichtung fuer den einsatz in der entgasung von geschmolzenem metall.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/552,340 US4494735A (en) 1983-11-16 1983-11-16 Apparatus for degassing molten metal
US552340 1983-11-16

Publications (3)

Publication Number Publication Date
EP0169290A2 EP0169290A2 (de) 1986-01-29
EP0169290A3 EP0169290A3 (en) 1987-01-14
EP0169290B1 true EP0169290B1 (de) 1990-03-14

Family

ID=24204922

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84810534A Expired - Lifetime EP0169290B1 (de) 1983-11-16 1984-11-05 Vorrichtung für den Einsatz in der Entgasung von geschmolzenem Metall

Country Status (11)

Country Link
US (1) US4494735A (zh)
EP (1) EP0169290B1 (zh)
JP (2) JPS60116731A (zh)
AT (1) ATE51067T1 (zh)
AU (1) AU567194B2 (zh)
CA (1) CA1239791A (zh)
DE (1) DE3481640D1 (zh)
ES (1) ES8506811A1 (zh)
NO (1) NO162866C (zh)
NZ (1) NZ210030A (zh)
ZA (1) ZA848580B (zh)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4647018A (en) * 1986-02-26 1987-03-03 Swiss Aluminium Ltd. Apparatus for degassing molten metal
ZW12087A1 (en) * 1986-07-05 1987-10-28 Injectall Ltd Improvements in nozzles for injecting substances into liquids
US4767598A (en) * 1986-09-22 1988-08-30 Aluminum Company Of America Injection apparatus for introduction of a fluid material into a molten metal bath and associated method
US4744545A (en) * 1987-02-03 1988-05-17 Swiss Aluminium Ltd. Apparatus for degassing molten metal
DE4025956A1 (de) * 1990-08-16 1992-02-20 Didier Werke Ag Feuerfeste fuellung eines ringspaltes bei einem metallurgischen gefaess
DE4213007C1 (de) * 1992-04-21 1993-12-16 Tech Resources Pty Ltd Verfahren und Vorrichtung zum Abdichten von Düsen in der umgebenden feuerfesten Ausmauerung
US5794858A (en) * 1996-05-29 1998-08-18 Ingersoll-Rand Company Quick assembly waterjet nozzle
US20020164913A1 (en) * 2001-05-04 2002-11-07 Pieters Gerogeann Composite material

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE336995C (de) * 1921-05-20 Herbert Bondy Duesenanordnung fuer Schmelzoefen
US3695603A (en) * 1970-09-22 1972-10-03 Kennecott Copper Corp Replaceable insert for tuyere pipes of metal-refining furnaces
US4177066A (en) * 1978-06-12 1979-12-04 Swiss Aluminium Ltd. Method and apparatus for the removal of impurities from molten metal
FR2498946B1 (fr) * 1980-11-10 1986-05-09 Europ Propulsion Injecteur composite pour l'introduction d'un premier produit corrosif dans une chaudiere contenant un deuxieme produit corrosif
US4392636A (en) * 1981-07-22 1983-07-12 Swiss Aluminium Ltd. Apparatus for degassing molten metal

Also Published As

Publication number Publication date
ZA848580B (en) 1985-06-26
ATE51067T1 (de) 1990-03-15
NO162866C (no) 1990-02-28
US4494735A (en) 1985-01-22
ES537232A0 (es) 1985-08-16
AU3470684A (en) 1985-05-23
NO844534L (no) 1985-05-20
EP0169290A2 (de) 1986-01-29
CA1239791A (en) 1988-08-02
JPH0229733B2 (zh) 1990-07-02
NZ210030A (en) 1987-03-31
DE3481640D1 (de) 1990-04-19
JPS60116731A (ja) 1985-06-24
EP0169290A3 (en) 1987-01-14
JPH0363493A (ja) 1991-03-19
ES8506811A1 (es) 1985-08-16
NO162866B (no) 1989-11-20
AU567194B2 (en) 1987-11-12

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