EP2309527A2 - Vorrichtung zur fügen durch schweißen eines Deckels am ende einer Zylinderkörper und Vakuumröhre mit einer solchen vorrichtung - Google Patents

Vorrichtung zur fügen durch schweißen eines Deckels am ende einer Zylinderkörper und Vakuumröhre mit einer solchen vorrichtung Download PDF

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Publication number
EP2309527A2
EP2309527A2 EP10354048A EP10354048A EP2309527A2 EP 2309527 A2 EP2309527 A2 EP 2309527A2 EP 10354048 A EP10354048 A EP 10354048A EP 10354048 A EP10354048 A EP 10354048A EP 2309527 A2 EP2309527 A2 EP 2309527A2
Authority
EP
European Patent Office
Prior art keywords
cover
cylindrical body
end surface
plane
hood
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.)
Granted
Application number
EP10354048A
Other languages
English (en)
French (fr)
Other versions
EP2309527A3 (de
EP2309527B1 (de
Inventor
Hans Schellekens
Marie-Françoise Devismes
Dominique Mazzucchi
Olga Kozlova
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.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric Industries SAS
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 Schneider Electric Industries SAS filed Critical Schneider Electric Industries SAS
Publication of EP2309527A2 publication Critical patent/EP2309527A2/de
Publication of EP2309527A3 publication Critical patent/EP2309527A3/de
Application granted granted Critical
Publication of EP2309527B1 publication Critical patent/EP2309527B1/de
Active legal-status Critical Current
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
    • H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
    • 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
    • H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
    • H01H2033/66215—Details relating to the soldering or brazing of vacuum switch housings

Definitions

  • the present invention relates to an assembly device by brazing an end cap on a cylindrical body, said end cap having a circular peripheral edge through which said cap is brazed on a part of one of the surfaces of end of the cylindrical body, and a vacuum bulb assembled by means of such an assembly device.
  • One of the problems related to the assembly by brazing of parts of different types, such as a ceramic part with a metal part for example, is related to the appearance of residual stresses in this assembly mainly due to the difference of coefficients of expansion of the materials to be assembled. These residual stresses can lead, in the short or long term, to cracking of the assembly.
  • Brazing of the reactive type provides a mechanical strength which is 20% lower than conventional brazing. Thus, this type of brazing is more difficult to achieve on a design of the bulb as described in the patent cited above.
  • the present invention solves these problems and proposes an assembly device by brazing a cover on a cylindrical body providing improved mechanical strength between the two parts, making it possible in particular to produce between the two parts a brazing of the reactive type, as well as a vacuum bulb assembled according to this device.
  • the subject of the present invention is a brazing assembly device of the kind mentioned above, this device being characterized in that the aforementioned hood is shaped so that the circular peripheral portion of the aforementioned hood exerts on less than one third of the aforementioned end surface of the cylindrical body, after brazing, a compressive force.
  • said cover comprises, after its brazed portion on the cylindrical body and in the direction of the central axis of the cylindrical body, a first portion offset relative to the aforementioned end surface of the cylindrical body, towards the outside of the cylindrical body, this first part being followed by a second part extending inside the cylindrical body, said first and second parts extending all around the axis of the bulb.
  • the first part comprises a portion extending substantially perpendicular to the axis of the cylindrical body and constituting the outer wall of the cover
  • the second part comprises a portion extending substantially perpendicular to the axis of the bulb and constituting the inner wall of the hood.
  • the depth of the second part of the hood measured between the plane of the end surface of the hood and the plane of the outer surface of the portion constituting the inside wall of the aforementioned hood, is greater than 6 mm, and the height of the first part of the cover, measured between the plane of the end surface of the cover and the plane of the inner surface of said first said portion constituting the outer wall of the cover, is less than 2mm.
  • this height is greater than 0.5 mm.
  • the depth of the second part of the cover measured between the plane of the end surface of the cover and the plane of the outer surface of the portion constituting the inner wall of the aforementioned cover, is arbitrary, and in that that the height of the first part of the cover, measured between the plane of the end surface of the cover and the plane of the inner surface of said first said portion constituting the outer wall of the cover, is greater than 2mm.
  • the thickness E of the hood is less than 2.5 mm.
  • the hood is brazed flat on the end surface of the cylindrical body.
  • the cover comprises, starting from the outer peripheral edge, an end portion, said first portion brazed flat on the end surface of the body of the bulb, extending in a plane substantially perpendicular to the axis of the bulb, followed by a so-called second portion, inclined relative to this first portion of an angle ⁇ , which inclined portion is followed by a portion said third extending parallel to the first, which third portion is followed by another portion said fourth portion inclined relative to the preceding, an angle ⁇ between 90 ° and 180 °, which is followed by a last portion said fifth extending substantially perpendicular to the axis of the bulb.
  • the angle ⁇ is between 55 ° and 125 °.
  • the so-called first zone of the end surface of the cylindrical body which zone is situated between each peripheral edge of said surface and the edge situated on the same side with respect to the end of the hood, of the surface of the brazing on said end surface is greater than 1 mm in length.
  • this device comprises a means for preventing the solder from creating bonds in an area of the end surface of the cap, called the second zone, situated opposite the aforementioned said first zone of the end surface of the cylindrical body.
  • the so-called first zone is covered with an anti-wetting agent or the zone, called the second zone, is covered with a localized oxidation, in order to prevent the solder from creating bonds in this latter zone.
  • the solder is set back from the area where the brazing fillet should be located, the length of this withdrawal being a function of the diffusion rate of the solder at the soldering temperature and the time of soldering. brazing, so that at the end of brazing, said solder does not extend beyond the contact surface between the end surface of the cap and the end surface of the cylindrical body.
  • the soldering is of the reactive type.
  • Another subject of the present invention is a vacuum interrupter comprising a solder assembly device, comprising the previously mentioned characteristics taken alone or in combination.
  • a vacuum bulb A comprising, in a manner known per se, a cylindrical body 1 made of ceramic closed by two end caps 2, 3 of metal, one of which 2, said first, comprises a sealing bellows 4 mounted around an actuating rod 5 supporting the movable contact 6 of the bulb.
  • the fixed contact 7 of the bulb A is supported by a rod 8 fixed to the second end cap 3.
  • the two end caps 2, 3 are respectively assembled on the two end surfaces 9, 10 of the cylindrical body at means of an assembly device according to the invention.
  • each end cap 2,3 is brazed to the corresponding end surface 9, 10 of the body and is shaped so that said hood presses on the cylindrical body on the largest contact (or brazing) surface 11 between said cover and said end surface.
  • the end cap 3 comprises a first part C offset from the aforementioned end surface 10 of the cylindrical body 1 towards the outside of the cylindrical body, this first part C being followed by a second part D plunging inside the cylindrical body 1.
  • This hood 3 comprises, starting from the outer peripheral edge 12 to the center 13, a so-called first end portion 14, brazed flat on the end surface 10 of the body 1 of the bulb, said portion extending along a plane substantially perpendicular to the axis X of the bulb, followed by a so-called second portion 15 inclined relative to this first portion 14 of an angle ⁇ , which inclined portion 15 is followed by a portion said third 16 extending parallel to the first and constituting the outer surface of the cover 3, which portion 16 is followed by another portion 17 said fourth inclined relative to the previous, an angle ⁇ between 90 ° and 180 °, which is followed by a last portion 18 said fifth, extending substantially perpendicularly to the axis of the bulb constituting the inner wall of the cover and also the central part of the cover, the angle ß being advantageously between 55 ° e t 125 °.
  • the depth H1 of the second part D of the cover 3, measured between the plane of the brazing surface 11 situated on the end surface 19 of the cover or on that of the cylindrical body, and the plane of the outer surface 18a of the said portion 18 fifth of the cover, is greater than 6 mm.
  • the height H2 of the first portion C of the cover 3 measured between the brazing surface 11 and the surface 16a directed towards the interior of the bulb A, of the aforesaid third portion 16, is less than 2 mm.
  • the solder must not go back on the hood, which imposes a minimum clearance height of 0.5min H2min.
  • H1 and H2 make it possible to absorb the stresses by plastic deformation as much as possible in order to induce the least possible stresses in the ceramic.
  • values of depth and height are necessary to obtain a compression effect on the body of the bulb over the largest possible area of the brazing surface.
  • the thickness E of the cover is advantageously less than 2.5 mm.
  • the wetting angle on the ceramic is advantageously ⁇ 90 °.
  • the angle of clearance of the cover ⁇ is advantageously between 55 ° and 125 °, which prevents the rise of the solder along the cover.
  • the hood shall be centered on the ceramic and be located at a sufficient distance from the edges of the ceramic body, so that solder fades 11a, 11b, which correspond to the ends of the brazed joints, are located in areas where the assembly is subject to reduced residual stresses.
  • the distance A between each edge 23 of the brazing surface 11 and the edge 22 situated on the same side of the end surface 10 of the body 1 of the ceramic is advantageously greater than 1 mm.
  • the solder is set back from the area where the brazing fillet will be located, the length of this withdrawal being dependent on the diffusion rate of the solder at the temperature. brazing.
  • the diffusion rate of the solder is of the order of one micron / second.
  • the solder will be offset by about 1 mm with respect to each end of the brazing surface.
  • the cover has been designed so that the brazing surface is located in an area subjected to constraints mainly in compression so that the cracks, if they start, can not propagate in the material.
  • fragile that is to say the ceramic. Indeed, if a crack starts in an area of the assembly subjected to tensile forces, it can spread, whereas if it starts in an area subjected to compression forces, it does not spread .
  • the brazing fades 11a, 11b are points of the assembly from which the cracks can begin. It is therefore important to design the assembly so that these brazing fades are located in areas subject to the lowest possible stresses and, preferably, in compression so that the cracks, if they start, can not occur. propagate in the fragile material, that is to say the ceramic. Indeed, if a crack starts in an area of the assembly "in traction", it can spread and lead to a break, whereas if it starts in a zone in compression, it does not spread.
  • This problem has been solved according to the invention, either by shifting the solder, relative to the place where it must be located, depending on the diffusion rate of the solder and the soldering time, or by providing an anti- wetting on the cylindrical body, a localized oxidation on a hood area, or a combination of these three solutions.
  • the present invention therefore proposes an assembly design that minimizes the stresses and locates them in areas where the cracks, if they are initiated, can not propagate.
  • the present invention therefore makes it possible to improve the mechanical strength of a brazing assembly such as the assembly of a metal with an oxide ceramic, so as to reduce the scrap rates and to provide an improvement in cases where the stresses of use are more severe (especially in case of over-molding, ).
  • This makes it possible to use a brazing of the reactive type which, in known manner, provides a lower mechanical strength than the conventional brazing.
  • the invention applies to the assembly of vacuum bulbs and, in general to all assemblies that require a good seal throughout their service life.
  • the invention is not limited to the embodiments described and illustrated which have been given by way of example.

Landscapes

  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
EP10354048.0A 2009-10-12 2010-09-13 Vorrichtung zur fügen durch schweißen eines Deckels am ende einer Zylinderkörper und Vakuumröhre mit einer solchen Vorrichtung Active EP2309527B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0904867A FR2951314A1 (fr) 2009-10-12 2009-10-12 Dispositif d'assemblage par brasage d'un capot d'extremite sur un corps cylindrique et ampoule a vide comportant un tel dispositif

Publications (3)

Publication Number Publication Date
EP2309527A2 true EP2309527A2 (de) 2011-04-13
EP2309527A3 EP2309527A3 (de) 2012-08-29
EP2309527B1 EP2309527B1 (de) 2016-05-04

Family

ID=42111136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10354048.0A Active EP2309527B1 (de) 2009-10-12 2010-09-13 Vorrichtung zur fügen durch schweißen eines Deckels am ende einer Zylinderkörper und Vakuumröhre mit einer solchen Vorrichtung

Country Status (4)

Country Link
US (1) US8181842B2 (de)
EP (1) EP2309527B1 (de)
CN (1) CN102039461B (de)
FR (1) FR2951314A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103817390A (zh) * 2014-02-24 2014-05-28 贵州天义电器有限责任公司 一种用于接触器装配的钎焊连接工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7004027B2 (ja) * 2020-06-18 2022-01-21 株式会社明電舎 真空インタラプタおよび真空遮断器

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4436241A (en) 1979-03-05 1984-03-13 Hazemeijer B.V. Metal-ceramic joint

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US4436241A (en) 1979-03-05 1984-03-13 Hazemeijer B.V. Metal-ceramic joint

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103817390A (zh) * 2014-02-24 2014-05-28 贵州天义电器有限责任公司 一种用于接触器装配的钎焊连接工艺

Also Published As

Publication number Publication date
FR2951314A1 (fr) 2011-04-15
EP2309527A3 (de) 2012-08-29
US8181842B2 (en) 2012-05-22
US20110084117A1 (en) 2011-04-14
EP2309527B1 (de) 2016-05-04
CN102039461B (zh) 2016-03-16
CN102039461A (zh) 2011-05-04

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