US3872271A - Vacuum circuit interruptor including a gettering device - Google Patents

Vacuum circuit interruptor including a gettering device Download PDF

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Publication number
US3872271A
US3872271A US407041A US40704173A US3872271A US 3872271 A US3872271 A US 3872271A US 407041 A US407041 A US 407041A US 40704173 A US40704173 A US 40704173A US 3872271 A US3872271 A US 3872271A
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US
United States
Prior art keywords
gettering
vacuum
interruptor
circuit interruptor
stationary
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
US407041A
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English (en)
Inventor
Jan Christiaan Clason
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.)
Hazemeijer BV
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Hazemeijer BV
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Filing date
Publication date
Application filed by Hazemeijer BV filed Critical Hazemeijer BV
Application granted granted Critical
Publication of US3872271A publication Critical patent/US3872271A/en
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/668—Means for obtaining or monitoring the vacuum
    • H01H33/6683—Means for obtaining or monitoring the vacuum by gettering

Definitions

  • a gettering device is also positioned within the housing for taking up any gases which may be released during the operation of the circuit interruptor and may be produced by leakage in order to maintain the desired vacuum.
  • the gettering device includes the gettering substance which is heated by an electric current flow which is derived by a transformer action from the electric current flowing through the circuit interruptor.
  • the vacuum in the interrupting space is maintained.
  • the vacuum is so high that the mean free path of the electrons is much longer than the spacing between the opened contact members.
  • the temperature of the contact members, the walls of the interrupting space and other components of the circuit interruptor will increase rapidly, and it is possible that the components will release some gas.
  • the pressure in the interrupting space can become so high that the mean free path of the electrons has become equal to or smaller than the maximum contact spacing, so that the vacuum circuit interruptor can no longer function as a switch, i.e., can no longer switch off an electric current, since the space between the contact members has become electrically conductive.
  • the vacuum circuit interruptor is provided with a gettering device.
  • a so-called gettering substance is provided in the vacuum space, such as e.g., zirconium-aluminium or zirconium-titanium, which can absorb gas molecules.
  • the gettering substance is in the form of a layer, for example, applied to the rod of one of the interrupting contact members. The absorptive power for gas molecules of the gettering substance increases as the temperature of the gettering substance rises.
  • the taking up capacity of the gettering substance at room temperature is only and usually it is necessary to rise the temperature of the gettering substance to a value of about 400C.
  • the gettering substance absorbs the gas molecules, which will thendiffuse into the bulk of the gettering substance vfrom the surface.
  • the diffusing speed of the gas molecules into the gettering substance increases as the temperature of the gettering substance rises.
  • An objective of the invention is to bring the gettering substance in a vacuum circuit interruptor to a high temperature.
  • the gettering device is provided with a gettering substance which is heated by an electric current flow which is derived by transformer action from the electric current, flowing through the circuit interruptor.
  • the gettering device includes an annular iron core arranged about the rod of the stationary contact member.
  • a plurality of metal sheets are arranged around the annular core, which sheets act as the secondary winding and also as the secondary load ofa transformer.
  • the rod acts as the primary winding of the transformer.
  • the gettering substance is deposited as a layer on the metal sheets.
  • FIG. 1 is a longitudinal cross section of the vacuum circuit interruptor according to the invention.
  • FIG. 2 is a cross sectionalong line II-II through the gettering device of the vacuum circuit interruptor according to FIG. 1.
  • the vacuum circuit interruptor includes a metal housing 1, usually of cilindrical form, to which in vacuum tight fashion two insulators, 2, 3 are secured.
  • the contact rod 4- of the stationary contact member 5 is passed through the one insulator 3, and the contact rod 4 is secured to the insulator 3 by the rings 6 in a vacuum tight fashion.
  • the movable contact which in the left hand portion of FIG. 1 is illustrated in a partially sectional view and in the right hand portion of FIG. 1 in its closed view, is constituted by the contact member 7 and the contact rod 8, which is secured to one end of a metal bellows 9.
  • bellows 9 is secured in vacuum tight fashion in the other insulator 2 by means of the rings 20.
  • the contact rod 8 of the movable contactmember 7 is provided at 11 with a screw connected operating rod, which is not illustrated.
  • screening rings 12, 13 are disposed to prevent copper vapours which are released by the copper contact members 5, 7 during the interrupting process from depositing on the internal cylindrical surface of the insulators 2, 3 which otherwise would be bridged so that the interruptor would be shorted.
  • a pumping stem 14 is illustrated, with which the circuit interruptor is evacuated in the factory, but which is sealed vacuum tight on the finished interruptor.
  • the gettering device includes a soft iron ring'core 16, around which a large number of metal sheets 17 is disposed, a layer of a gettering substance being applied to the sheets 17.
  • the crown of metal sheets 17 rests on a collar 18 of the contact rod 5, while the sheets 17 with their other ends bear against a ring 19, which is connected to the contact rod 4.
  • the gettering device cannot move in the axial direction with respect to the contact rod 4. If the vacuum circuit interruptor is closed, as illustrated in the right hand portion of FIG. 1, the contact rod.
  • the metal sheets 17 act as the secondary winding and also as the secondary load, the ring core 16 constituting the iron magnetic circuit.
  • the metal sheets 17 are sufficiently heated by the secondary-current flowing therein to bring the gettering substance on the sheets to the operating temperature.
  • the operating temperature should be about 400C. With that temperature the diffusion speed of the gas molecules into the to maintain the desired vacuum,.said gettering device including an annular iron core arranged about said stationary rod;
  • transformer means having as its primary winding, said stationary rod and as its secondary winding, a plurality of metal sheets arranged around said annular iron core and transferring an electric current flow from the current interruptor through said primary winding to said secondary windings;
  • gettering material being deposited as layers on said metal sheets so as to be heated by the electric current through said metal sheets, which act as said secondary windings.

Landscapes

  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
US407041A 1972-10-18 1973-10-17 Vacuum circuit interruptor including a gettering device Expired - Lifetime US3872271A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL727214103A NL149629B (nl) 1972-10-18 1972-10-18 Vacuuemschakelaar met vangstofelement.
SE1410372 1972-10-18

Publications (1)

Publication Number Publication Date
US3872271A true US3872271A (en) 1975-03-18

Family

ID=26644817

Family Applications (1)

Application Number Title Priority Date Filing Date
US407041A Expired - Lifetime US3872271A (en) 1972-10-18 1973-10-17 Vacuum circuit interruptor including a gettering device

Country Status (10)

Country Link
US (1) US3872271A (ja)
JP (1) JPS5624340B2 (ja)
AT (1) AT328029B (ja)
AU (1) AU465944B2 (ja)
BE (1) BE806050A (ja)
CA (1) CA996164A (ja)
CH (1) CH563658A5 (ja)
FR (1) FR2204032B1 (ja)
GB (1) GB1423379A (ja)
NL (1) NL149629B (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018124979A2 (en) 2016-12-31 2018-07-05 Yodyingyong Supan A method for producing a micron-size spherical silica aerogel

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL170995C (nl) * 1978-12-01 1983-01-17 Hazemeijer Bv Vacuuemschakelaar, alsmede metalen scherm en vangstofelement daarvoor.
JPS6076220U (ja) * 1983-10-31 1985-05-28 日本精機株式会社 計器照明装置
JPS6092120U (ja) * 1983-11-30 1985-06-24 日本精機株式会社 前面照明計器装置の照明ケ−ス取付構造
JPH053937Y2 (ja) * 1984-11-30 1993-01-29

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3090852A (en) * 1960-02-11 1963-05-21 Gen Electric Gettering arrangement for a vacuum circuit interrupter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1947413A1 (de) * 1968-10-28 1970-04-30 Getters Spa Getterpumpe zur Erzeugung und Aufrechterhaltung eines Vakuums in geschlossenen Gefaessen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3090852A (en) * 1960-02-11 1963-05-21 Gen Electric Gettering arrangement for a vacuum circuit interrupter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018124979A2 (en) 2016-12-31 2018-07-05 Yodyingyong Supan A method for producing a micron-size spherical silica aerogel

Also Published As

Publication number Publication date
NL7214103A (ja) 1974-04-22
AU465944B2 (en) 1975-10-09
CH563658A5 (ja) 1975-06-30
AT328029B (de) 1976-02-25
ATA885473A (de) 1975-05-15
NL149629B (nl) 1976-05-17
AU6121873A (en) 1975-04-10
JPS5624340B2 (ja) 1981-06-05
FR2204032A1 (ja) 1974-05-17
FR2204032B1 (ja) 1978-04-14
DE2350489A1 (de) 1974-05-02
DE2350489B2 (de) 1976-04-15
CA996164A (en) 1976-08-31
GB1423379A (en) 1976-02-04
BE806050A (nl) 1974-04-12
JPS4973674A (ja) 1974-07-16

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