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EP0061655B2 - Switch chamber for electric contacts sealed from the environment - Google Patents

Switch chamber for electric contacts sealed from the environment Download PDF

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Publication number
EP0061655B2
EP0061655B2 EP82102182A EP82102182A EP0061655B2 EP 0061655 B2 EP0061655 B2 EP 0061655B2 EP 82102182 A EP82102182 A EP 82102182A EP 82102182 A EP82102182 A EP 82102182A EP 0061655 B2 EP0061655 B2 EP 0061655B2
Authority
EP
European Patent Office
Prior art keywords
getter
environment
contacts
switch chamber
electric contacts
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
EP82102182A
Other languages
German (de)
French (fr)
Other versions
EP0061655B1 (en
EP0061655A3 (en
EP0061655A2 (en
Inventor
Hans Sauer
Takashi Takada
Yukihiro Kondo
Tetsuo Mori
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.)
Cessione sds - Relais AG
Original Assignee
Matsushita Electric Works 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25798806&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0061655(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from JP56048766A external-priority patent/JPS57162644A/en
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to AT82102182T priority Critical patent/ATE22749T1/en
Publication of EP0061655A2 publication Critical patent/EP0061655A2/en
Publication of EP0061655A3 publication Critical patent/EP0061655A3/en
Publication of EP0061655B1 publication Critical patent/EP0061655B1/en
Application granted granted Critical
Publication of EP0061655B2 publication Critical patent/EP0061655B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/64—Protective enclosures, baffle plates, or screens for contacts
    • H01H1/645—Protective enclosures, baffle plates, or screens for contacts containing getter material

Definitions

  • the invention relates to a switching chamber sealed from the environment, in which electrical contacts are accommodated and which is closed off by a getter which has a glued-on getter carrying housing cap, the substance used as getter material being adsorptive with respect to substances which form foreign layers on the contacts works. Such substances are to be kept away from the contacts by the adsorption, so that the contact resistance is kept as unchanged as possible.
  • a relay is known with a switching chamber sealed from the environment of the type described in the introduction, the getter being glued to the inner wall of the housing cap, which is made of plastic and encloses the switching chamber.
  • the getter the structure of which is not specified in the publication mentioned, primarily serves to lower the relative atmospheric humidity in the relay.
  • FR-A-1 482 981 generally teaches the use of aluminum oxide with a pore diameter of 10 to 100 nm for gas separation by adsorption of a component, the pore size depending on the gases to be separated.
  • the invention is based on the object of providing a getter in a sealed switching chamber of the type mentioned at the outset in such a way that it binds the substances which tend to form foreign layers on the contacts as effectively as possible.
  • the solution to this problem is characterized in claim 1.
  • the attachment of the getter according to the invention to a metallic wall section of the housing has the effect that this part is generally cooler than the area of the contacts due to its better thermal conductivity, so that there is a temperature gradient between the contacts and the getter that damages the harmful ones Substances on the getter and thus the getter effect favors.
  • the diffusion barrier provided according to claim 2 serves to protect the getter against contamination by the adhesive used for its attachment, so that the getter retains its full effectiveness with regard to the actual substances to be adsorbed.
  • the switching chamber described here forms part of a relay in which a coil body 10 with a winding 11 is arranged on a base plate 9 provided with connections 8.
  • a contact tongue 12 runs through a coaxial passage of the coil former 10 and is fastened at one end to a carrier 13.
  • the other free end of the contact tongue 12 is mounted between two fixed contacts 14 and 15, which simultaneously act as pole pieces of a permanent magnet 16 arranged between them.
  • the polarized relay thus formed is tightly enclosed by a metallic housing cap 17 placed on the base plate 9.
  • a getter pill 1 is attached to the inside of the end wall of the housing cap 17 adjacent to the free end of the contact tongue 12 and the fixed contacts 14 and 15 by means of an adhesive 4.
  • the getter pill 1 preferably consists essentially of aluminum oxide (Al 2 O 3 ) mixed with organic binder, known as alumina, with a pore diameter that is larger than 3 nm and smaller than 100 nm with an average value in the range from about 7 to 20 nm.
  • a layer 2 of water glass for example Na 2 Si0 3 or K 2 Si0 3
  • this layer 2 can also be provided on the side surfaces of the getter pill 1, so that only the surface 1a of the getter pill 1 facing the switching chamber is free as an active surface.
  • the interior of the relay forming the switching chamber is preferably filled with a protective gas of such a moisture content that a relative atmospheric humidity of not less than 5% and not more than 40% is established by the action of the getter material.
  • the getter material ensures a constant moisture content of the protective gas by adsorption of H 2 O molecules, which can diffuse from the environment if the switching chamber is hermetically sealed. This enables a constant dielectric strength with regard to the contacts.
  • the getter material is preferably produced in a sintering process.
  • the binder required for the shaping evaporates during the sintering.
  • the desired pore size can be achieved by choosing the binder, the pressure during shaping, the sintering temperature and the sintering time.
  • the attachment of the getter pill 1 to the metallic housing cap 17 causes a temperature gradient between the contacts and the getter material such that the getter material is generally cooler than the contacts. This favors the precipitation of harmful substances on the getter pill 1.
  • the relay is warmer than the environment due to the energy conversion taking place on the coil and contacts, so that heat is transferred the housing is delivered.
  • the cooling of the housing that takes place here simultaneously lowers the temperature level of the getter substance, which favors its getter effect.
  • the spatial size of the getter material is selected taking into account its getter effect and the volume of the switching chamber in such a way that a noteworthy pressure drop in the switching chamber is excluded. In addition to the getter effect, this can also ensure constant dielectric strength in the long term.
  • the getter material can exert its effect
  • the getter material is preferably activated bar at a temperature of at least 100 ° C and a vacuum of approximately 10. 8
  • gases bound in the pores and also crystalline bound H 2 O are released.

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  • Gas-Filled Discharge Tubes (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Description

Die Erfindung betrifft eine von der Umgebung abgedichtete Schaltkammer, in der elektrische Kontakte untergebracht sind und die durch eine an ihrer Innenseite einen angeklebten Getter tragende Gehäusekappe abgeschlossen ist, wobei als Getterstoff eine Substanz dient, die bezüglich Stoffen, die auf den Kontakten Fremdschichten bilden, adsorptiv wirkt. Durch die Adsorption sollen derartige Stoffe von den Kontakten ferngehalten werden, so dass der Kontaktübergangswiderstand möglichst unverändert beibehalten wird.The invention relates to a switching chamber sealed from the environment, in which electrical contacts are accommodated and which is closed off by a getter which has a glued-on getter carrying housing cap, the substance used as getter material being adsorptive with respect to substances which form foreign layers on the contacts works. Such substances are to be kept away from the contacts by the adsorption, so that the contact resistance is kept as unchanged as possible.

Aus der DE-A-2 320 618 ist ein Relais mit einer von der Umgebung abgedichteten Schaltkammer der eingangs bezeichneten Art bekannt, wobei der Getter an der Innenwand der die Schaltkammer umschliessenden, aus Kunststoff bestehenden Gehäusekappe angeklebt ist. Der Getter, über dessen Struktur in der genannten Druckschrift nichts näheres ausgesagt ist, dient dabei in erster Linie dazu, die relative -Luftfeuchtigkeit in dem Relais abzusenken.From DE-A-2 320 618 a relay is known with a switching chamber sealed from the environment of the type described in the introduction, the getter being glued to the inner wall of the housing cap, which is made of plastic and encloses the switching chamber. The getter, the structure of which is not specified in the publication mentioned, primarily serves to lower the relative atmospheric humidity in the relay.

Aus der US-A-3 124 671 ist es bekannt, zum Schutz von Relaiskontakten gegen organische Dämpfe Getter mit einem mittleren Porendurchmesser von 4 nm einzusetzen.From US-A-3 124 671 it is known to use getters with an average pore diameter of 4 nm to protect relay contacts against organic vapors.

Die FR-A-1 482 981 lehrt allgemein den Einsatz von Aluminiumoxid mit einem Porendurchmesser von 10 bis 100 nm zur Gastrennung durch Adsorption eines Bestandteils, wobei sich die Porengrösse nach den zu trennenden Gasen richtet.FR-A-1 482 981 generally teaches the use of aluminum oxide with a pore diameter of 10 to 100 nm for gas separation by adsorption of a component, the pore size depending on the gases to be separated.

Der Erfindung liegt die Aufgabe zugrunde, in einer abgedichteten Schaltkammer der eingangs bezeichneten Art einen Getter derart vorzusehen, dass er die zur Fremdschichtbildung an den Kontakten neigenden Substanzen möglichst effektiv bindet.The invention is based on the object of providing a getter in a sealed switching chamber of the type mentioned at the outset in such a way that it binds the substances which tend to form foreign layers on the contacts as effectively as possible.

Die Lösung dieser Aufgabe ist im Patentanspruch 1 gekennzeichnet. Die erfindungsgemässe Befestigung des Getters an einem metallischen Wandabschnitt des Gehäuses hat die Wirkung, dass dieser Teil aufgrund seiner besseren Wärmeleitfähigkeit in der Regel kühler ist als der Bereich der Kontakte, so dass zwischen den Kontakten und dem Getter ein Temperaturgefälle besteht, das den Niederschlag der schädlichen Substanzen auf den Getter und damit die Getterwirkung begünstigt.The solution to this problem is characterized in claim 1. The attachment of the getter according to the invention to a metallic wall section of the housing has the effect that this part is generally cooler than the area of the contacts due to its better thermal conductivity, so that there is a temperature gradient between the contacts and the getter that damages the harmful ones Substances on the getter and thus the getter effect favors.

Die nach Anspruch 2 vorgesehene Diffusionsbarriere dient dazu, den Getter gegen Verunreinigung durch den zu seiner Befestigung verwendeten Klebstoff zu schützen, damit der Getter seine volle Wirksamkeit bezüglich der eigentlichen zu adsorbierenden Substanzen behält.The diffusion barrier provided according to claim 2 serves to protect the getter against contamination by the adhesive used for its attachment, so that the getter retains its full effectiveness with regard to the actual substances to be adsorbed.

Ein bevorzugtes Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung näher erläutert, die einen Längsschnitt durch ein elektromagnetisches Relais mit eingebauter Getterpille darstellt.A preferred embodiment of the invention is explained in more detail below with reference to the drawing, which shows a longitudinal section through an electromagnetic relay with a built-in getter pill.

Gemäss der Zeichnung bildet die hier beschriebene Schaltkammer Teil eines Relais, bei dem auf einer mit Anschlüssen 8 versehenen Grundplatte 9 ein Spulenkörper 10 mit einer Wicklung 11 angeordnet ist. Durch eine koaxiale Durchführung des Spulenkörpers 10 verläuft eine Kontaktzunge 12, die mit ihrem einen Ende an einem Träger 13 befestigt ist. Das andere freie Ende der Kontaktzunge 12 ist zwischen zwei Festkontakten 14 und 15 gelagert, die gleichzeitig als Polschuhe eines zwischen ihnen angeordneten Dauermagneten 16 wirken. Das so gebildete polarisierte Relais wird von einer auf die Grundplatte 9 aufgesetzten metallischen Gehäusekappe 17 dicht umschlossen.According to the drawing, the switching chamber described here forms part of a relay in which a coil body 10 with a winding 11 is arranged on a base plate 9 provided with connections 8. A contact tongue 12 runs through a coaxial passage of the coil former 10 and is fastened at one end to a carrier 13. The other free end of the contact tongue 12 is mounted between two fixed contacts 14 and 15, which simultaneously act as pole pieces of a permanent magnet 16 arranged between them. The polarized relay thus formed is tightly enclosed by a metallic housing cap 17 placed on the base plate 9.

An der Innenseite der dem freien Ende der Kontaktzunge 12 und den Festkontakten 14 und 15 benachbarten Stirnwand der Gehäusekappe 17 ist eine Getterpille 1 mittels eines Klebstoffes 4 befestigt. Die Getterpille 1 besteht vorzugsweise im wesentlichen aus mit organischem Bindemittel versetztem, unter dem Namen Tonerde bekanntem Aluminiumoxid (AI203) mit einem Porendurchmesser, der grösser ist als 3 nm und kleiner als 100 nm bei einem Mittelwert im Bereich von etwa 7 bis 20 nm. Zur Vermeidung einer Verunreinigung des Getterwerkstoffs durch den Klebstoff 4 oder dessen Lösungsmittel ist zwischen die Getterpille 1 und den Klebstoff 4 eine als Diffusionsbarriere wirkende Schicht 2 aus Wasserglas (z. B. Na2Si03 oder K2Si03) eingefügt. Diese Schicht 2 kann auch, wie in Figur 1 gezeigt, an den Seitenflächen der Getterpille 1 vorgesehen sein, so dass nur die der Schaltkammer zugewandte Oberfläche 1a der Getterpille 1 als aktive Fläche frei ist.A getter pill 1 is attached to the inside of the end wall of the housing cap 17 adjacent to the free end of the contact tongue 12 and the fixed contacts 14 and 15 by means of an adhesive 4. The getter pill 1 preferably consists essentially of aluminum oxide (Al 2 O 3 ) mixed with organic binder, known as alumina, with a pore diameter that is larger than 3 nm and smaller than 100 nm with an average value in the range from about 7 to 20 nm. In order to avoid contamination of the getter material by the adhesive 4 or its solvent, a layer 2 of water glass (for example Na 2 Si0 3 or K 2 Si0 3 ) acting as a diffusion barrier is inserted between the getter pill 1 and the adhesive 4. As shown in FIG. 1, this layer 2 can also be provided on the side surfaces of the getter pill 1, so that only the surface 1a of the getter pill 1 facing the switching chamber is free as an active surface.

Vorzugsweise ist der die Schaltkammer bildende Innenraum des Relais mit einem Schutzgas von derartigem Feuchtigkeitsgehalt gefüllt, dass sich durch Einwirkung des Getterstoffes eine relative Luftfeuchtigkeit von nicht weniger als 5 % und nicht mehr als 40 % einstellt. Hierbei sorgt der Getterstoff durch Adsorption von H20-Molekülen, die bei einer hermetischen Abdichtung der Schaltkammer von der Umgebung nachdiffundieren können, für eine gleichbleibende Feuchtigkeit des Schutzgases. Dies ermöglicht eine konstante Spannungsfestigkeit bezüglich der Kontakte.The interior of the relay forming the switching chamber is preferably filled with a protective gas of such a moisture content that a relative atmospheric humidity of not less than 5% and not more than 40% is established by the action of the getter material. Here, the getter material ensures a constant moisture content of the protective gas by adsorption of H 2 O molecules, which can diffuse from the environment if the switching chamber is hermetically sealed. This enables a constant dielectric strength with regard to the contacts.

Der Getterstoff ist bevorzugt in einem Sinterverfahren hergestellt. Das für die Formgebung erforderliche Bindemittel verdampft dabei während des Sinterns. Durch Wahl des Bindemittels, des Druckes bei der Formgebung, der Sintertemperatur und der Sinterdauer ist dabei die angestrebte Porengrösse erreichbar.The getter material is preferably produced in a sintering process. The binder required for the shaping evaporates during the sintering. The desired pore size can be achieved by choosing the binder, the pressure during shaping, the sintering temperature and the sintering time.

Die Befestigung der Getterpille 1 an der metallischen Gehäusekappe 17 bewirkt, dass zwischen den Kontakten und dem Getterstoff ein derartiges Temperaturgefälle besteht, dass der Getterstoff in der Regel kühler ist als die Kontakte. Dadurch wird der Niederschlag schädlicher Substanzen auf der Getterpille 1 begünstigt.The attachment of the getter pill 1 to the metallic housing cap 17 causes a temperature gradient between the contacts and the getter material such that the getter material is generally cooler than the contacts. This favors the precipitation of harmful substances on the getter pill 1.

In der Regel ist das Relais durch den an Spule und Kontakten stattfindenden Energieumsatz wärmer als die Umgebung, so dass Wärme über das Gehäuse abgegeben wird. Die hier stattfindende Abkühlung des Gehäuses erniedrigt gleichzeitig das Temperaturniveau des Getterstoffes, was dessen Getterwirkung begünstigt.As a rule, the relay is warmer than the environment due to the energy conversion taking place on the coil and contacts, so that heat is transferred the housing is delivered. The cooling of the housing that takes place here simultaneously lowers the temperature level of the getter substance, which favors its getter effect.

Ferner ist die räumliche Grösse des Getterstoffes unter Berücksichtigung seiner Getterwirkung und des Volumens der Schaltkammer so gewählt, dass eine nennenswerte Druckabsenkung in der Schaltkammer ausgeschlossen ist. Damit kann neben der Getterwirkung auch konstante Spannungsfestigkeit langfristig gewährleistet werden.Furthermore, the spatial size of the getter material is selected taking into account its getter effect and the volume of the switching chamber in such a way that a noteworthy pressure drop in the switching chamber is excluded. In addition to the getter effect, this can also ensure constant dielectric strength in the long term.

Damit der Getterstoff seine Wirkung entfalten kann, ist der Getterstoff vorzugsweise bei einer Temperatur von mindestens 100 °C und einem Unterdruck von ca. 10-8 bar aktivierbar. Hierdurch werden in den Poren gebundene Gase als auch kristallin gebundenes H20 freigesetzt.Thus, the getter material can exert its effect, the getter material is preferably activated bar at a temperature of at least 100 ° C and a vacuum of approximately 10. 8 As a result, gases bound in the pores and also crystalline bound H 2 O are released.

Claims (2)

1. Switch chamber sealed from the environment, in which electric contacts (12, 14, 15) are housed and which is closed by a housing cap (17) carrying a getter (1) pasted on its interior side, the getter material being a substance effective to adsorb materials which form layers of foreign material on the contacts (12, 14, 15), characterised in that the getter (1) is pasted on the interior side of a metallic wall section of the housing cap (17), the pores of the getter having a diameter greater than 3 nm and smaller than 100 nm with the mean diameter value being in the range of 7 to 20 nm.
2. Switch chamber according to claim 1, characterised in that the getter (1) is stuck to the interior side of the metallic wall section with an interposed layer (2) of water glass (e. g. Na2Si03, K2Si03) which acts as a diffusion barrier.
EP82102182A 1981-03-31 1982-03-17 Switch chamber for electric contacts sealed from the environment Expired - Lifetime EP0061655B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82102182T ATE22749T1 (en) 1981-03-31 1982-03-17 ENVIRONMENTALLY SEALED ELECTRICAL CONTACT SWITCHING CHAMBER.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP48766/81 1981-03-31
JP56048766A JPS57162644A (en) 1981-03-31 1981-03-31 Gas adsorbent
DE3200392 1982-01-08
DE3200392A DE3200392C2 (en) 1981-03-31 1982-01-08 Hermetically sealed switching chamber for electromagnetic relays

Publications (4)

Publication Number Publication Date
EP0061655A2 EP0061655A2 (en) 1982-10-06
EP0061655A3 EP0061655A3 (en) 1983-04-27
EP0061655B1 EP0061655B1 (en) 1986-10-08
EP0061655B2 true EP0061655B2 (en) 1990-03-28

Family

ID=25798806

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82102182A Expired - Lifetime EP0061655B2 (en) 1981-03-31 1982-03-17 Switch chamber for electric contacts sealed from the environment

Country Status (3)

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US (1) US4430537A (en)
EP (1) EP0061655B2 (en)
CA (1) CA1179311A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3001437B2 (en) * 1996-11-18 2000-01-24 東北日本電気株式会社 Electrical contact and its activation suppression method
AUPQ230499A0 (en) * 1999-08-18 1999-09-09 University Of Sydney, The Evacuated glass panel with getter and method of construction thereof
CN101163586A (en) * 2005-02-17 2008-04-16 泽斯吸气剂公司 Flexible multi-layered getter
JP4327747B2 (en) * 2005-02-21 2009-09-09 双葉電子工業株式会社 Electronic device having non-evaporable getter and method for manufacturing the electronic device
ES2378198B1 (en) * 2010-07-19 2012-12-28 Abengoa Solar New Technologies S.A. NEW NON-EVAPORABLE GETTER DISPOSITION FOR SOLAR COLLECTOR TUBE.
US9388628B2 (en) * 2012-07-31 2016-07-12 Guardian Industries Corp. Vacuum insulated glass (VIG) window unit with getter structure and method of making same
US9416581B2 (en) 2012-07-31 2016-08-16 Guardian Industries Corp. Vacuum insulated glass (VIG) window unit including hybrid getter and making same
EP3462472B1 (en) 2017-09-29 2022-04-20 Tyco Electronics Componentes Electromecânicos Lda Seal housing for an electrical device and sealed relay using the seal housing

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124671A (en) * 1964-03-10 Jgjtg
US2295694A (en) * 1941-06-19 1942-09-15 Westinghouse Electric & Mfg Co Water vapor getter
FR1109644A (en) * 1954-08-09 1956-01-31 Philips Nv Stop Layer Electrode System
FR1482981A (en) * 1966-04-19 1967-06-02 Pechiney Saint Gobain Porous materials in agglomerated alumina
GB1269273A (en) * 1969-06-06 1972-04-06 Exxon Research Engineering Co Preparation of crystalline alumina by homogenous precipitation
DE2320617A1 (en) * 1973-04-24 1974-11-14 Deutsche Fernsprecher Gmbh HERMETICALLY SEALED RELAY
DE2933443A1 (en) * 1979-08-17 1981-02-26 Siemens Ag HOUSING FOR AN ELECTRICAL COMPONENT

Also Published As

Publication number Publication date
EP0061655B1 (en) 1986-10-08
EP0061655A3 (en) 1983-04-27
US4430537A (en) 1984-02-07
CA1179311A (en) 1984-12-11
EP0061655A2 (en) 1982-10-06

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