EP0152307A2 - Durchführeinrichtung - Google Patents

Durchführeinrichtung Download PDF

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Publication number
EP0152307A2
EP0152307A2 EP85300995A EP85300995A EP0152307A2 EP 0152307 A2 EP0152307 A2 EP 0152307A2 EP 85300995 A EP85300995 A EP 85300995A EP 85300995 A EP85300995 A EP 85300995A EP 0152307 A2 EP0152307 A2 EP 0152307A2
Authority
EP
European Patent Office
Prior art keywords
arrangement
conductor
furnace
sheath
wall
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.)
Withdrawn
Application number
EP85300995A
Other languages
English (en)
French (fr)
Other versions
EP0152307A3 (de
Inventor
Ray Winstanley
Malcolm Booth
John Mcculloch
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.)
Electricity Council
Original Assignee
Electricity Council
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 Electricity Council filed Critical Electricity Council
Publication of EP0152307A2 publication Critical patent/EP0152307A2/de
Publication of EP0152307A3 publication Critical patent/EP0152307A3/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0006—Electric heating elements or system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H01B17/30—Sealing
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/06—Electrodes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/16—Heating by glow discharge

Definitions

  • This invention relates to a leadthrough arrangement for providing an electrical connection through the wall of a furnace.
  • thermochemical treatment apparatus for example in apparatus for plasma carburising workpieces in a vacuum furnace, there is a need for a leadthrough arrangement which serves to take the HT electrical supply for the glow discharge through the wall of the furnace.
  • the furnace wall itself constitutes the anode of the electrical supply, and thus the leadthrough arrangement must be capable of passing an electrical conductor through an opening in the wall of the furnace in vacuum tight manner, with the conductor electrically isolated from the wall of the furnace, and must not be adversely affected by the high temperatures, of the order of 1000 C, which can occur in the furnace.
  • a particular difficulty which arises with known leadthrough arrangements when used in plasma carburising furnaces is that sooty deposits can build up on parts of the arrangement and provide arc tracking paths. to earth for the HT supply.
  • a leadthrough arrangement for providing an electrical connection through the wall of a furnace, comprising a tubular body adapted to be mounted over an opening in said wall in vacuum tight manner; an electrical conductor passing through said body and electrically isolated therefrom; an insulating member serving to mount said conductor in said body; and an insulating sheath surrounding said conductor throughout its length within said body.
  • a leadthrough arrangement embodying this invention will now be described by way of example with reference to the drawing which is a longitudinal sectioned view of the arrangement.
  • the arrangement comprises a tubular body 1 of high- nickel steel, having welded to one end thereof a mounting flange 2 by which the body 1 is in use secured over an opening in a furnace wall (not shown! in vacuum tight manner, for example by means of a clamp.
  • the body 1 At its other end the body 1 carries an annular ceramic insulating member 3 which is secured by vacuum brazing in an end portion of the body 1 and which projects therefrom.
  • a relatively small diameter metal conductor rod 4 Passing through the body 1 and insulating member 3 is a relatively small diameter metal conductor rod 4 which within the furnace is connected to a worktable (not shown) and which serves to take an HT electrical supply into the furnace for establishing a glow discharge therein between the worktable and the furnace wall which constitutes the other electrode of the supply.
  • the rod 4 projects beyond the free end of the insulating member 3 and has secured thereon a metal ; coupling member 5 which is carried by the insulating member 3 by way of a steel cap member 6 which is secured about a free end portion of the insulating member 3 and which has a hole therein through which a portion of the coupling member 5 projects.
  • the coupling member 5 has a flange 7 which abuts the cap member 6, and the free end portion 8 of the coupling member 5 is externally threaded.
  • a finned heat sink 9 which also serves as the electrical connection to the rod 4 an HT supply lead (not shown) being connected to the heat sink 9, for example by means of a screw connection (not shown).
  • the rod 4 is thus held in position relative to the body 1 by means of the coupling member 5, cap member 6 and insulating member 3, and extends through the body 1 in electrically isolated manner.
  • a ceramic insulating sheath 10 Surrounding the rod 4 throughout its length within the body 1 is a ceramic insulating sheath 10 which extends through the insulating member 3 and terminates within the cap member 6.
  • the space defined by the cap member 6, the free end of the insulating member 3 and the end of the ceramic sheath lO is filled with a potting material comprising refractory cement material 11 which has been fired to remove all traces of moisture.
  • the body 1 is secured over an opening in a furnace wall, by means of the flange 2, with the conductor rod 4 and its surrounding sheath 10 extending into the furnace, the rod 4 being electrically connected as required at a worktable within the furnace.
  • the HT electrical supply is then connected up with the furnace wall serving as the positive earth connection and the rod 4 serving as the negative connection, the voltage accross the connection being of the order of 1000V.
  • any heat conducted down the conductor rod 4 is dissipated by the heat sink 9 which would normally be fan cooled, thus ensuring that the arrangement is not subjected to excessive temperatures
  • the sheath 10 serves to prevent tracking between the rod 4 and the body 1 which is at the potential of the furnace wall, which tracking could be caused by soot deposits forming in the body 1.
  • the use of the refractory cement material 11 serves to prevent the possibility of a discharge within what would otherwise be an empty space, and in particular serves to avoid the occurrence of hollow cathode effects.
  • the cooling effected by the heat sink 9 maintains the arrangement at a temperature which reduces soot formation to a minimum within the arrangement.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connections Arranged To Contact A Plurality Of Conductors (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Resistance Heating (AREA)
EP85300995A 1984-02-15 1985-02-14 Durchführeinrichtung Withdrawn EP0152307A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08403943A GB2154379A (en) 1984-02-15 1984-02-15 Leadthrough arrangement
GB8403943 1984-02-15

Publications (2)

Publication Number Publication Date
EP0152307A2 true EP0152307A2 (de) 1985-08-21
EP0152307A3 EP0152307A3 (de) 1988-08-24

Family

ID=10556624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85300995A Withdrawn EP0152307A3 (de) 1984-02-15 1985-02-14 Durchführeinrichtung

Country Status (2)

Country Link
EP (1) EP0152307A3 (de)
GB (1) GB2154379A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0174156A1 (de) * 1984-08-29 1986-03-12 The Electricity Council Träger für das zu behandelnde Gut in einem Glimmentladungsofen
CN102769989A (zh) * 2012-07-17 2012-11-07 西安电子科技大学 等离子体放电腔体内置冷却电极的绝缘密封装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR852026A (fr) * 1938-03-24 1940-01-22 Traversée électrique pour appareils de réaction sous vide
FR966111A (fr) * 1947-05-10 1950-10-02 Bbc Brown Boveri & Cie Traversée ou entrée d'électrodes ou de conducteurs dans des récipients sous pression ou à vide
FR1188732A (fr) * 1956-12-18 1959-09-24 Plessey Co Ltd Dispositif de connexion électrique et son procédé de fabrication
FR2049618A5 (de) * 1969-06-13 1971-03-26 Commissariat Energie Atomique
DE2201348A1 (de) * 1972-01-07 1973-07-12 Siemens Ag Elektrische durchfuehrung
DE2524217A1 (de) * 1975-05-31 1976-12-16 Kernforschung Gmbh Ges Fuer Hochspannungsdurchfuehrung
FR2444834A1 (fr) * 1978-12-18 1980-07-18 Procal Montage etanche d'un element a travers la paroi d'un reservoir tel qu'un ballon d'eau chaude

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB314808A (en) * 1928-07-02 1930-11-03 Siemens Ag Means for protecting the insulating sleeves of electrical machine windings from glow discharge phenomena
GB547967A (en) * 1941-07-03 1942-09-18 Percy Cox Improvements in and relating to explosively actuated apparatus for perforating submerged or other articles
GB793974A (en) * 1955-10-28 1958-04-23 British Thomson Houston Co Ltd Improvements relating to electric insulating bushing assemblies
GB1152482A (en) * 1966-03-25 1969-05-21 Telephone Cables Ltd Improvements in and relating to Bonding Plastics Material
US3418423A (en) * 1966-12-23 1968-12-24 Philips Corp Fluorine-resistant electrical terminal
GB1254025A (en) * 1969-08-13 1971-11-17 Gen Electric Co Ltd Improvements in or relating to sealing arrangements between tubular members

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR852026A (fr) * 1938-03-24 1940-01-22 Traversée électrique pour appareils de réaction sous vide
FR966111A (fr) * 1947-05-10 1950-10-02 Bbc Brown Boveri & Cie Traversée ou entrée d'électrodes ou de conducteurs dans des récipients sous pression ou à vide
FR1188732A (fr) * 1956-12-18 1959-09-24 Plessey Co Ltd Dispositif de connexion électrique et son procédé de fabrication
FR2049618A5 (de) * 1969-06-13 1971-03-26 Commissariat Energie Atomique
DE2201348A1 (de) * 1972-01-07 1973-07-12 Siemens Ag Elektrische durchfuehrung
DE2524217A1 (de) * 1975-05-31 1976-12-16 Kernforschung Gmbh Ges Fuer Hochspannungsdurchfuehrung
FR2444834A1 (fr) * 1978-12-18 1980-07-18 Procal Montage etanche d'un element a travers la paroi d'un reservoir tel qu'un ballon d'eau chaude

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0174156A1 (de) * 1984-08-29 1986-03-12 The Electricity Council Träger für das zu behandelnde Gut in einem Glimmentladungsofen
CN102769989A (zh) * 2012-07-17 2012-11-07 西安电子科技大学 等离子体放电腔体内置冷却电极的绝缘密封装置

Also Published As

Publication number Publication date
GB8403943D0 (en) 1984-03-21
EP0152307A3 (de) 1988-08-24
GB2154379A (en) 1985-09-04

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Inventor name: MCCULLOCH, JOHN

Inventor name: WINSTANLEY, RAY

Inventor name: BOOTH, MALCOLM