EP0043258A2 - Vakuumschalter und Verfahren zur Herstellung desselben - Google Patents

Vakuumschalter und Verfahren zur Herstellung desselben Download PDF

Info

Publication number
EP0043258A2
EP0043258A2 EP81302900A EP81302900A EP0043258A2 EP 0043258 A2 EP0043258 A2 EP 0043258A2 EP 81302900 A EP81302900 A EP 81302900A EP 81302900 A EP81302900 A EP 81302900A EP 0043258 A2 EP0043258 A2 EP 0043258A2
Authority
EP
European Patent Office
Prior art keywords
end plate
secured
sealing member
auxiliary
housing
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
EP81302900A
Other languages
English (en)
French (fr)
Other versions
EP0043258B1 (de
EP0043258A3 (en
Inventor
Shinzo Sakuma
Junichi Warabi
Eiji Umeya
Yukio Kobari
Hidemi Kawaguchi
Yoshiyuki Kashiwagi
Hifumi Yanagisawa
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.)
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Original Assignee
Meidensha Corp
Meidensha Electric Manufacturing Co 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
Priority claimed from JP8875080A external-priority patent/JPS5713637A/ja
Priority claimed from JP9256080A external-priority patent/JPS5717526A/ja
Priority claimed from JP9303880A external-priority patent/JPS5717529A/ja
Priority claimed from JP9969380A external-priority patent/JPS5725631A/ja
Priority claimed from JP9969480A external-priority patent/JPS5725632A/ja
Priority claimed from JP9969680A external-priority patent/JPS5725634A/ja
Application filed by Meidensha Corp, Meidensha Electric Manufacturing Co Ltd filed Critical Meidensha Corp
Publication of EP0043258A2 publication Critical patent/EP0043258A2/de
Publication of EP0043258A3 publication Critical patent/EP0043258A3/en
Application granted granted Critical
Publication of EP0043258B1 publication Critical patent/EP0043258B1/de
Expired legal-status Critical Current

Links

Images

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
    • 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
    • H01H2033/66223—Details relating to the sealing of vacuum switch housings
    • 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
    • H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations
    • H01H2033/66276—Details relating to the mounting of screens in vacuum switches
    • 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
    • H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations
    • H01H2033/66292—Details relating to the use of multiple screens in vacuum switches
    • 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
    • H01H33/66238—Specific bellows details
    • 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
    • H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations

Definitions

  • the present invention relates to a vacuum interrupter and, more particularly, a vacuum interrupter manufactured by using a suitable metallic auxiliary sealing material.
  • Vacuum circuit interrupters are, generally, constructed by a highly evacuated envelope, a stationary electrical contact provided in the envelope, a movable electrical contact provided in the envelope so as to be opposite to the stationary electrical contact and shields.
  • the envelope comprises, substantially, a tubular housing, a pair of end plates.
  • the housing is, generally, fabricated by a cylindrical insulating material, and a pair of metallic end plates used to form the evacuated envelope.
  • the vacuum interrupter is, generally, constructed by the steps of fixing an upper and a lower end plates to each axial end of a cylindrical insulating having respectively, mounting a bellows on the lowe end plate, inserting a movable contact rod into the bellows, securing a movable electrical contact on the movable contact rod, and incorporating a stationary contact rod housing a stationary electrical contact at the bottom thereof to the upper end plate.
  • a vacuum interrupter and method of making the vacuum interrupter comprising an evacuated envelope including a cylindrical housing made of a metallic material and having metallized portions formed at the axial ends thereof and a disc-shaped upper end plate made of inorganic ceramics such as a high alumina contained ceramics or crystallized glass and having an aperture at the center thereof, a sttionary electrical contact mounted on an end of a stationary contact rod inserted into said envelope through said aperture of said upper end plate, a movable contact rod inserted into the envelope through the aperture of said lower end plate, a bellows supporting said movable contact rod and made of a metallic material in the form of an austenite stainless steel, having an upper end, the lower end of said bellows is fixed to said lower end plate by means of a brazing material, shielding means for shielding the inner surface of the insulating portion of the envelope, and an auxiliary sealing member for aiding the brazing between the metallic portion and the insulating portion.
  • a method of manufacturing a vacuum interrupter which comprises a step of:
  • a method of constructing a vacuum power interrupter which comprises the steps of: supporting an upper end plate made of an inorganic insulating material and having an aperture in the center portion thereof horizontally, inserting' a stationary, contact rod made of Cu into said aperture of the aperture of the upper end plate by means of brazing material, mounting a sttionary electrical contact made of an alloy including Cu on an end of said stationary contact rod to form a stationary portion, disposing a lower end portion of a bellows made of an austenite stainless steel on a lower end plate made of an inorganic insulating material, having an aperture in the center' portion thereof, by means of a metallized portion and a brazing material, inserting a movable contact rod made of an alloy including Cu into said bellows through said aperture of the lower end plate by means of a brazing material, disposing a movable electrical contact made of Cu on an end portion of said stationary contat to form a movable portion, providing a
  • brazing in order to melt said brazing materials and evacuate gaseous products of brazing, mounting said brazed stationary portion on said first auxiliary sealing member of the housing portion by way - of.a brazing material, mounting said brazed movable portion on said second auxiliary sealing member of the housing portion by way of a brazing material and, heating said previously assembled interrupter to a brazing temperature range between 550°C to 1050°C while evacuating at the envelope at a pressure which is less than 10 -5 Torr. in order to melt said brazing materials and evacuate gaseous products of brazing.
  • the invention as claimed provides:
  • An advantage offered by the invention is that by constructing an envelope by employing a housing made of a non-magnetic metallic material, end plates made of insulating materials in the form of .a ceramics or crystallized glass and auxiliary sealing members made of metallic materials which are deformable due to the thermal stress at the high temperature, it is possible to provide a vacuum power interrupter of which a diameter can be easily and inexpensively made large in order to enhance the performance of the vacuum power interrupter.
  • the vacuum interrupter of the invention comprises, substantially, an evacuated envelope A including a cylindrical housing 10 made of a non-magnetic material in the form of an austenite stainless steel, an upper end plate 12 and a lower end plate 14, both of which are made of inorganic materials such as alumina ceramics or crystallized glass, an electrical contact member B including a stationary contact rod 16 supported by the upper end plate 12, a stationary electrical contact 18' secured to the stationary contact rod 16, a movable contact r od 20 supported by the lower end plate 14, a movable electrical contact 22 secured to the movable contact rod 20, and a shielding member C for shielding an internal surface of the end plates 12 and 14.
  • an evacuated envelope A including a cylindrical housing 10 made of a non-magnetic material in the form of an austenite stainless steel, an upper end plate 12 and a lower end plate 14, both of which are made of inorganic materials such as alumina ceramics or crystallized glass, an electrical contact member B including a stationary contact rod 16 supported by the upper end plate
  • the vacuum interrupter of the invention further comprises first sealing means D for sealing hermetically the upper end plate 12 to the housing 10, second sealing means E for sealing hermetically the lower end plate 14, first supporting means F for supporting and securing hermetically the stationary contact rod 16 to the upper end plate 12, and hermetic seal means G for sealing movably and hermetically the movable contact rod 20 on the lower end plate 14.
  • the stationary electrical contact 18 has a circular recess 18a provided in the center portion thereof.
  • an end portion of the stationary contact rod 16 is inserted and secured to the bore 18a.
  • the movable electrical contact 22 is provided with a circular recess 22a in the center portion thereof and a ring-shaped slot 22b on the opposed surface to the stationary electrical contact 18.
  • An end portion of the movable contact rod 20 is inserted and secured to the recess 18a, and an electrical contact ring 22c is disposed on the slot 22b to form the contact member B.
  • the shielding member C comprises a first main arc-shield 23 mounted on the stationary contact rod 16, a first auxiliary shield 24 secured on the upper end plate 12, a second main arc-shield 26 mounted on the movable contact rod 20 and a second auxiliary shield 28 secured to the lower end plate 14.
  • axial and circular stepped portions 10a and 10b are provided at inner surfaces of open end portions of the housing 10.
  • a first auxiliary sealing member 30 is fitted between the housing 10 and the upper end plate 12.
  • a second auxiliary sealing member 32 is provided between the housing 10 and the lower end plate 14.
  • the first auxiliary brazing member 30 has a ring-shaped flat portion 30a and a tubular portion 30b formed in one piece with the flat portion 30a.
  • the second auxiliary sealing member 32 has also a ring-shaped flat portion 32a and a tubular portion 32b formed in one peace with the flat portion 32b.
  • the upper end plate 12 has an aperture 12a provided in the center portion thereof and a tubular portion 12b formed at the peripheral edge portion thereof.
  • the lower end plate 14 has an aperture 14a provided in the center portion thereof and a tubular portion 14b formed at the peripheral edge portion thereof.
  • first sealing means D comprises the stepped portion 10a of the housing 10, the first auxiliary sealing member 30 fitted in the stepped portion 10a of the housing 10, and the upper end plate 12 disposed on the auxiliary sealing member 30 by means of a metallized portion 34 provided on an end of the tubular portion 12b of the upper end plate 12.
  • the second sealing means E comprises the stepped portion lOb of the housing 10, the second auxiliary sealing member 32 fitted in the stepped portion 10b of the housing 10, and the lower end plate 14 fitted in the auxiliary brazing member 32 by means of a metallized portion 34 provided on an end of the tubular portion of the lower end plate 14.
  • a clip ring 36a is fitted into an annular slot 16a provided on the circumferential surface of the sttionary contact rod 16.
  • the stationary contact rod 16 is inserted into the housing 10 through a third auxiliary sealing member 38.
  • the third auxiliary sealing member 38 is provided with a tubular portion 38a and a flange portion 38b.
  • a metallized portion 34 is provided in an inner surface of the aperture 12a of the upper end plate 12.
  • the tubular portion 38a of the third auxiliary sealing member 38 is inserted into the aperture 12a by way of the metallized portion 34.
  • the first supporting means F comprises the clip ring 36a and the third auxiliary sealing member 38.
  • the movable contact rod 20 is inserted into a bellows 40.
  • An upper end 40b of the bellows 40 is secured in vacuum-tight seal by means of a brazing material 42.
  • a lower end of the 1 bellows 40 is inserted into the aperture 14a of the lower end plate 14 and is secured in vacuum-tight seal by means of a metallized portion 34b and a brazing material 42 to form the hermetic seal means G.
  • the cylindrical housing 10 of the envelope A is made of a non-magnetic metallic material in the form of the austenite stainless steel which has the high mechanical strength. Both open end portions of the housing 10 are provided with axial stepped portions 10a and 10b located inner periphery side of the housing 10.
  • the upper end plate 12 is made of an inorganic insulating material in the form of ceramics or crystallized glass and has a ring-shaped projection 12b projecting toward the inner side of the envelope 10.
  • the lower end plate 14 is made of an inorganic insulating material such as ceramics or crystallized glass and has a ring-shaped projection 14b at the edge portion thereof and projecting toward the inner side of the envelope 10.
  • the first auxiliary sealing member 30 is made of a plastic deformable metallic material such as Cu and is provided with a ring-shaped flange portion 30a and a short tubular-shaped projection 30b. As is best shown in Figure 2, the flange portion 30a of the first auxiliary sealing member 30 is disposed on the stepped portion 10a of the housing 10. The flange 24a of the first auxiliary shield 24a is provided between the stepped portion 10a of the housing 10 and the flange 30a of the first auxiliary sealing member 30. The projection 12b of the upper end plate 12 is disposed on the flange portion 30a of the first auxiliary sealing member 30 via a metallized portion 34.
  • the brazing materials 42 are provided between the stepped portion 10a of the housing 10 and the flange 30a of the first auxiliary sealing member 30 and between the end of the housing 10 and the tubular portion 30b of the first auxiliary brazing member 30. Accordingly, the first sealing means D is comprised by the stepped portion 10a, the ring-shaped projection 12b of the upper end plate 12, the metallized portion 34 provided on the end surface of the projection 12b of the upper end plate 12 and the brazing materials 42.
  • the second sealing means E comprises, similar to the first connecting means D, the stepped portion 10b of the housing 10, the second auxiliary sealing member 32 provided in the stepped portion 10b of the housing 10, the projection 14b of the lower end plate 14 is fixed into the second auxiliary sealing member 32 via a metallized portion 34.
  • the stationary contact rod 22 is made of Cu, and is inserted into the housing 10 through the aperture 12a of the upper end plate 12 and is secured to the upper end plate 12 by means of the first supporting means F.
  • the first supporting means F comprises the aperture 12a of the upper end plate 12, a third auxiliary brazing member 38 having a tubular portion 38a and a flange portion 38b integrally formed with the tubular portion 38a, which is made of a plastic deformable material in the form of Cu, the upper end plate 12 made of the inorganic insulating material, a metallized portion 34 which is provided on an inner surface of the aperture 12a l a clamping member in the form of a cover ring 36a fixed into an annular groove 16a of the stationary contact rod 16.
  • the movable electrical contact 22 has a circular recess 22a, a ring-shaped slot '22b and a ring-shaped contact segment 22c fixed into the slot 22b.
  • the movable contact rod 20 is inserted and fixed in the circular slot 22a of the movable electrical contact 22.
  • the movable contact rod 20 is movably secured to the lower end plate 14 by means of the second supporting means G including the bellows 40 mounted on the movable contact rod 20, a clamping member in the form of a cover- ring 36c fixed to an annular groove 20a of the. movable contact rod 20 and a brazing material 42.
  • An upper end of the bellows 40 is secured to the movable contact rod 20.
  • a lower end of the bellows is inserted into the aperture 14a of the lower end plate 14 and is secured to the lower end plate 14 by the metallized portion 34 provided on an inner surface of the aperture 14a and a brazing material 42.
  • the shielding member C is made of a non-magnetic material in the form of an austenite stainless steel.
  • the main arc-shield 23 comprises a circular flat portion 23a, a tubular portion 22b and an aperture 23c provided at the center portion of the flat portion 23a.
  • the arc-shield 23 is inserted to the stationary contact rod 16 through the aperture 23c and is fixed to a clamping member in the form of a cover ring 36b fixed to an annular slot 16b of the stationary contact rod 16 by means of the brazing material 42.
  • the first auxiliary shield 24 comprises a tubular portion 24a and a flange portion 24b. The flange portion 24b of the first auxiliary shield 24 is secured to the stepped portion 10a of the housing 10.
  • the first auxiliary shield 24 has a smaller diameter than that of the first main arc-shield 22 and is coaxially provided with respect to the first main arc-shield 22.
  • the second main arc-shield 26 of the shielding member C has a circular flat portion 26a, a tubular portion 26b and an aperture 26c provided at the center portion of the flat portion 26a.
  • the arc-shield 26 is mounted on the movable contact rod 20 by the aperture 26c, cover ring 36c and the brazing material 42.
  • the second auxiliary shield 28 has a tubular portion 28a and a flange portion 28b which is secured to the stepped portion 10b of the housing 10..
  • the housing 10 is made of a non-magnetic metallic material in the form of an austenite stainless steel having the high mechanical strength.
  • Each of the upper and lower end plates 12 and 14 is made of the inorganic insulating material such as an ceramics or a crystallized glass.
  • Metallized portions 34 are made of -metal alloy obtained by adding Mo or Mn to Ti (Mn-Ti alloy or M o-Mn-Ti alloy) having the same coefficient of thermal expansion as that of the end plates 12 and 14, having a brazing temperature between 600°C and 100°C.
  • the stationary contact rod 16 and the movable contact rod 20 are made of Cu having a brazing temperature between 600°C and 1000°C.
  • the electrical contacts 18 and 22 are made of Cu.
  • the shielding member C is made of a non-magnetic material in the form of an austenite stainless steel.
  • the bellows 40 is made of an austenite stainless steel.
  • Each of the first auxiliary sealing member 30 and the second auxiliary sealing member 32 is made of a plastic deformable material in the form of Cu which is deformable by the thermal stress generated between the metallic housing 10 and the end plates 12 and 14 in slow cooling after the brazing and which is employed to enhance the sealing- connection between the metallic housing 10 and the upper and lower end plates 12 and 14 having the different coefficients of thermal expansion from that of the housing 10.
  • the auxiliary sealing members 30 and 32 can be made of Fe which is also deformable by the thermal stress in cooling after brazing.
  • the auxiliary sealing members 30 and 32 can be made of Fe-Ni-Co alloy or Fe-Ni alloy, which has the approximately same coefficient of thermal expansion with that of the end plates 12 and 14, in case that the housing 10 is made of Cu or Fe which is deformable by the thermal stress generated in slow cooling after the brazing.
  • the third auxiliary sealing member 38 is made of Cu which is also deformable by the thermal stress generated by the difference of the coefficient of thermal expansion between the upper end plate 12 and the stationary contact rod 16.
  • the third auxiliary brazing member 38 can be made of Fe-Ni-Co alloy or the Fe-Ni alloy, as in the case of the first and second auxiliary sealing members 30 and 32.
  • the shielding member C can be made of the-inexpensive Fe when the vacuum interrupter is employed to the relatively low current and low voltage power system.
  • the vacuum power interrupter is constructed by the steps of disposing firstly the lower end plate 14 horizontally at the axial end of the housing 10 by means of the brazing material, mounting the bellows 40 on the lower end plate 14 by means of the brazing material 42 such that a tubular portion 40a is inserted into the aperture 14a of the lower end plate 14 by way of the metallized portion 34b, fitting the second auxiliary sealing member 32 into projecting portion 14b of the lower end plate 14 by way of the metallized portion 34 and the brazing material 42, disposing the flange portion 28b of the second auxiliary shield 28 by way of the brazing material 42, fitting the stepped portion 10b of the housing 10 to the second auxiliary sealing member 32 by way of the flange 28b of the shield 28, surrounding the movable contact rod 20 at the upper end 40a of the bellows 40 by means of brazing material 42, supporting the movable contact rod 20 on the bellows 40 by means of the cover ring 36c, inserting the second main arc-shield 26
  • the following steps are further carried out: heating the brazing materials 42 which are inserted into between each component of the vacuum power interrupter at the brazing temperature which is between 950°C and 1050°C while evacuating at the pressure which is less than 10 -5 Torr. in a vacuum oven, and letting gases induced by heating each component out of the vacuum power interrupter.
  • heating temperature is high within the range of melting temperature of brazing material and the pressure is less than 10 -5 Torr.
  • the temperature of the vacuum furnace is gradually decreased to the room temperture and the vacuum power interrupter assembled is maintained at the room temperature during predetermined time interval.
  • the upper limit of the heating temperature is determined by 1053°C of copper melting temperature, and lowest heating temperature is determined by 900°C of brazing temperature of stainless steel.
  • the highest heating temperature may be less than 900°C by providing the Ni plating on the brazing portions such as the housing 10 and the bellows 40 made of the austenite stainless steel.
  • Figure 4 shows the thermal characteristics of the tensile strength F and the expansion U of Cu and Fe, with respect to to the temperature T.
  • a curva A 1 shows the tensile strength of the Cu with respect to the temperature
  • a curve B 1 designates the tensile strength of the Fe with respect to the temperature.
  • a curve A 2 shows the expansion rate of Cu
  • a curve B 2 shows the expansion rate of Fe with respect to the temperature.
  • the curves A l , B i and A 2 , B 2 of Figure 4 the tensile strength of the material made of Cu decreases with the increment of temperature, and the - expansion rate decreases and then increases with the increment of the temperature.
  • the deformability is performed due to the thermal stress in brazing and thereby the sealing of the junctions of the envelope is secured and that the residual thermal stress is very small, because the tensile strength the auxiliary sealing members made of Cu or Fe are very small comparing with that of the insulating end plates 12 and 14 made of the inorganic insulating materials such as the ceramics or the glass, when the auxiliary sealing members are brazed to the housing 10 and the end plates 12 and 14 at the high temperature less than 900°C.
  • the high sealing performance and the high mechanical strength of the envelope are obtained by employing the auxiliary sealing member made of Cu, Fe, Fe-Ni-Co alloy or Fe-Ni alloy, in spite that __the coefficients of the thermal expansion of the end plates 12 and 14 made of the inorganic insulating material in the form of ceramics differ from that of the housing 10 made of the metallic material such as the austenite stainless steel, Cu or Fe.
  • the high sealing performance between the end plates 12 and 14 and the housing 10 is obtained when the housing 10 is made of Fe, because the coefficient of thermal expansion of the F e is smaller than that of the Cu in spite that tensile strengt of the Fe with respect to the temperature is larger than that of Cu as is shown in Figure 4 and that the creep strain rate of Fe is smaller than that of Cu, under the predetermined temperature. Further, the high sealing performance between the end plate 14 and the bellows 40 can be obtained due to the plastic deformation thereof, since the thickness of the bellows 40 is very small (about 0.1 - 0.2 mm) and the thermal stress thereof is smaller than that of the lower end plate 14.
  • Figure 5 shows the second embodiment of the vacuum interrupter in accordance with the present invention.
  • the difference from the first embodiment stated above resides in a shielding member C, the second sealing means E, the first securing means F and hermetic seal means G.
  • the same reference numerals designated in Figure 1 through Figure 3 indicate corresponding parts of the vacuum power interrupter and therefore a detailed description of the corresponding parts described above will be omitted.
  • a first main arc-shield 44 has a disc-shaped flat portion 44a having an approximately same diameter as that of the stationary electrical contact 18 , a tubular portion 44b formed integrally with the flat portion 44a and a curved portion 44c curved rectangularly from the outer edge of the flat portion 44a.
  • the tubular portion of the first main arc-shield 44 is fitted to the stationary contact rod 16.
  • A.first auxiliary shield 46 has a circular flat portion 46a, a tubular portion 46b, a flange portion 46d and an aperture 4 ' 6d provided in the center of the flat portion 46a.
  • the flange portion 46d is secured to a stepped portion 10a of a housing 10.
  • a second main arc-shield 48 comprises, similar to the first main arc-shield 44, a circular flat portion 48a, a tubular portion 48b and a curved portion 48c.
  • the tubular portion 48b is fitted to a movable contact rod 20.
  • a second auxiliary shield 50 has a disc-shaped flat portion 50a, a tubular portion 50b and an aperture 50c provided at the center portion of the flat portion 50a.
  • An open end of the shield 50 is secured to an internal surface of a lower end plate 14.
  • a peripheral portion of an upper end plate 12 is disposed on the flange 46c of the shield 46 by means of a brazing material.
  • a diameter of the upper end plate 12 is smaller than an inner diameter of the stepped portion 10a of the housing 10.
  • a first auxiliary sealing member 30 has a ring-shaped flat portion 30a and a short tubular portion 30b. The tubular portion 30b is fitted into the stepped portion 10a, and the upper end plate 12 is fitted into the auxiliary sealing member 30 to form the first connecting means E.
  • a stationary contact rod 16 comprises an upper rod portion 16c and a lower rod portion 16d whose radius is smaller than that of the upper rod portion 16c.
  • Brazing material 42 is inserted along the edges of the central aperture 12a of the upper end plate 12, the bottom of upper rod portion 16c and the upper end of the lower rod portion 16d.
  • the lower rod portion 16d is inserted into the envelope A through the aperture 12a of the upper end plate 12 and the stationary contact rod 16 is supported to the end plate 12 by the upper rod portion 16c to form the first securing means F.
  • a lower end of a bellows 40 is fixed to an inner surface of the lower end plate 14 by means of a metallized portion 34. Accordingly, the sealing- performance is enhanced, because the mechanical strength of sealing is increased.
  • FIG 6 through Figure 8 show modifications of the shielding member C of the vacuum power interrupter of Figure 5.
  • a tubular portion 50b of a second auxiliary shield 50 is provided with a tapered portion 50c at an open end portion of the tubular portion 50c.
  • a semi-circular annular slot 50e is provided on a surface of the tubular portion 50b of the second auxiliary shield 50.
  • a plurality of axial slits 50f are provided on an open end of the tubular portion 50b of the shield 50. According to the shielding member C of Figure 8., the thermal stress is eliminated in brazing the shield 50 to the lower end plate 14 by providing the slits 50 in the open end of the tubular portion 50c.
  • FIG 9 shows a further modification of the vacuum interrupter of Figure 5.
  • a second auxiliary shield 50 comprises a circular flat portion 50a, a tubular portion 50b formed integrally with the flat portion 50a, an aperture 50c provided at the center portion thereof and a flange portion 50g curved rectangularly with respect to the tubular portion 50b.
  • the flange portion 50g is secured to a second auxiliary brazing member 32.
  • the vacuum interrupter of the second embodiment is manufactured by the same steps as that of the manufacturing method of the vacuum interrupter of the first embodiment. Namely, a brazing material is firstly disposed between each component of the vacuum power interrupter. Next, the vacuum interrupter previously assembled is located and inserted into a vacuum furnace and thereafter the vacuum power interrupter is heated at the brazing temperature which is between 900°C and 1050°C while evacuating at the pressure which is less than 10 -5 Torr. After the brazing material inserted in each component is melted, the temperature of the vacuum furnace is gradually decreased to a predetermined temperature and is maintained the vacuum furnace to the predetermined temperature during the given time interval. The temperature of the vacuum furnace is further gradually decreased to a room temperature. When the temperature is decreased to the room temperature, the respective components of the vacuum interrupter are securely and hermetically fixed each other.
  • a stepped portion 10c is provided at an outer surface of one end of a housing 10.
  • a stepped portion 10d is provided at an outer surface of other end of the housing 10.
  • a first auxiliary sealing member 30 is formed with a tubular shape and is fitted and secured to the stepped portion 10c via a metallized portion 34.
  • An upper end plate 14 is fitted into the first auxiliary sealing member 30 and is hermetically secured to the brazing member 42 by means of a metallized portion 34 to form first sealing means D.
  • a second auxiliary sealing member E is formed with a tubular shape and is fitted and secured to the stepped portion 10d of the housing 10 via a metallized portion 34.
  • a lower end plate 14 is fitted into the second auxiliary sealing member 32 and is hermetically secured to the second auxiliary sealing member 32 by means of a metallized portion 42 to form second sealing means E.
  • the upper end plate 12 is provided with an aperture 12a at the center portion thereof.
  • a stationary contact rod 16 has an upper rod portion 16c and a lower rod portion 16d of which diameter is smaller than that of the upper rod portion 16c.
  • a third auxiliary sealing member 38 comprises a first tubular portion 38a, a flat portion curved rectangularly from the first tubular portion 38a and a second tubular portion 38c which has a large diameter and a shorter than the first tubular portion 38a.
  • the first tubular portion 38a of the third auxiliary sealing member 38 is fitted to the lower rod portion 16d of the stationary contact rod 16, and an open end of the second tubular portion 38c of the third auxiliary sealing member 38 is secured to an inner surface of the upper end plate 14 by means of a metallized portion 34 and a brazing material to form the first supporting means F.
  • the shielding member C comprises a cup-shaped first main arc-shield 23 mounted on the stationary contact rod 16, a tubular-shaped first auxiliary shield 24 fixed to an inner surface of the upper end plate 12 by means of a metallized portion 34, and a brazing material, a second main arc-shield 26 mounted on a flange 20e of the movable contact rod 20 so as to be directed toward the lower end plate 14 and a tubular-shaped second auxiliary shield 28 fixed to an inner surface of the lower end plate 14 so as to be located coaxially with respect to the second main arc-shield 26. Since the auxiliary shields 24 and 26 are, respectively, secured to the end plates 12 and 14, the voltage potential is maintained to an intermediate value between that of the stationary contact rod 16 and that of the housing 10 and thereby the insulating strength within the envelope A is enhanced.
  • Each component of the shielding member C is made of an austenite stainless steel.
  • the auxiliary shields 24 and 28 can also be made of Cu or Fe which is deformable by the thermal stress generated by brazing the auxiliary shield 24 and 28 to the end plates 12 and 14 in .gradual cooling or can be made of Fe-Ni-Co alloy aro Fe-Ni alloy which has the approximately same coefficient of thermal expansion as that of the inorganic material such as an alumina-ceramics.
  • the vacuum interrupter is constructed by the steps of supporting the upper end plate 12 horizontally such that the etallized portions 34 are directed toward the upper direction, disposing the first auxiliary shield on the upper end plate 12 via the metallized portion 34, mounting the third auxiliary sealing member 38 to the upper end plate 12 by means of the metallized portion 34 and the brazing material, inserting the stationary contact rod 16 from the lower direction into the first tubular portion of the third auxiliary sealing member 38, mounting the first main arc-shield 22 on the cover ring 36c which is fixed to an annular groove 16b of the stationary contact rod 16 by means of the brazing material, and fixing a stationary electrical contact 18 to an end of the stationary contact rod 16.
  • the following steps are then further effected:
  • the lower end plate 14 is supported horizontally so that the metallized portions 34 is directed toward the upper direction.
  • the bellows 40 is disposed on the lower end plate 14 by way of the metallized portion 42.
  • the movable contact rod 20 is inserted from the upper side into the bellows 40 and is disposed on the upper end 40a of the bellows 40 by means of the flange 20e and thereafter the brazing mateiral is inserted between the upper end 40a and the flange 20e.
  • the second main arc-shield 26 is inserted to the upper end portion of the movable contact rod 20 and is engaged with the flange 20e by means of the brazing material.
  • the movable electrical contact 22 is secured to a circular recess 22a of the movable electrical contact 22 by means of the brazing material. Lastly, a contact ring 22c is secured in a circular recess 22b of the movable electrical contact 22.
  • auxiliary shields 24 and 28 of the shielding member C can be made of a plastic deformable metallic material such as Cu or Fe which is deformable in slow cooling and due to the thermal stress generated in brazing, or can be made of Fe-Ni-Co alloy or Fe-Ni alloy which has same coefficient of thermal expansion as that of the inorganic insulating material such as the ceramics.
  • the step is that mounting the axiliary shield 24 on the upper end plates 12, inserting the third auxiliary sealing member 38 to the stationary contact rod 16, engaging the first main arc-shield 23 with the cover ring 12c, and supporting the stationary side after inserting the stationary contact rod 16 into the aperture 12a of the upper end plate 12.
  • Each of the previously assembled stationary portion, the movable portion and the metallic housing portion is inserted into the vacuum furnace, a hydrogen environmental furnace or a deoxidation environmental furnace and is heated by the conventional method in order to enhance the activation of the surface of the material made of the austenite stainless steel and to carry out the digassing. Thereafter the temperature of each the vacuum furnace is gradually decreased to the brazing temperature and is kept to the predetermined temperature during a predetermined time interval. The temperature of the vacuum furnace is further decreased to the room temperature.
  • the leak test of the brazed stationary portion, the movable portion and the housing portion are carried out in order to confirm the sealing performance of the stationary and the movable portion.
  • second step of brazing is carried out in order to construct the vacuum interrupter.
  • the brazing stated above is again carried out.
  • the temporary construction of the vacuum interrupter is carried out by fitting the stationary portion and the movable portion to the housing portion. The temporarily assembled is heated at the temperature ranging from 500°C to 1050°C at the pressure less than 10" Torr.
  • each of said three portions is redegassed and then is brazed at high vacuum.
  • the temperature of the vacuum furnace is decreased to a predetermined temperature and is kept during a predetermined time interval at the deformation temperature.
  • the temperature of the vacuum furnace is further decreased from said deformation temperature to the room temperature.
  • each of the auxiliary brazing members is brazed to the metallic housing 10 at the first step of brazing in accordance with the manufacturing method described above, it is possible to braze the auxiliary sealing members to the end plates in the first step of brazing. Further, it is possible to carry out the brazing of the stationary portion and the movable portion in the fist step of brazing and thereafter to insert the auxiliary sealing members between the metallic housing and the end plates in previous assembling which is carried out prior to the second step of brazing.
  • first sealing means D comprises a first auxiliary sealing member 30 made of a metallic material such as an austenitic stainless steel connected to the housing 10 and the periphery of an upper end plate 12.
  • Second sealing means E includes a second auxiliary sealing member 32, of the same material as the first auxiliary sealing member 30, connected to the housing 10 and the periphery of a lower end plate 14.
  • the first auxiliary sealing member 30 comprises a first annular portion 30b, the outer diameter of which is the same as that of the housing 10, a first flange portion 30a, a second annular portion 30c formed integrally with the first flange portion 30a and a second flange portion 30d formed integrally with the second annular portion 30c.
  • the first annular portion 30b is fixed to an end of the housing 10.
  • the peripheral surface of the upper end plate 12 is fitted into the first annular portion 30b of the first auxiliary sealing member 30, sandwiching a metallized portion 34 therebetween.
  • the second sealing means E includes a second auxiliary sealing member 32 having a first annular portion 32b, a first flange portion 32a, a second annular portion 32c formed integrally with the first annular portion 32b by way of the first flange 32a, a second flange 32d, and a third annular portion 32e formed integrally with the second annular portion by way of the second flange 32d.
  • a shielding member C includes a first curved auxiliary shield 52 secured to the second flange 30d of the first auxiliary sealing member 30 and a second auxiliary shield 54 which is secured to the second flange 32c and the third annular portion 32e of the second auxiliary sealing member 32.
  • Figure 12 shows a modification of the vacuum power interrupter of Figure 11.
  • a first auxiliary sealing member 30 of the_ first sealing meand D comprises a first annular porbion 30b and a second annular portion 30f of diameter smaller than that of the first annular portion 30b and formed integrally with the first annular portion by way of a flange portion 30a.
  • the first annular portion 30b is fitted into the housing 10 and secured to the inner surface of the housing by means of brazing.
  • the peripheral surface of an upper end plate 12 is fitted into the second annular portion 30f and secured by means of brazing to form the first sealing means D.
  • a second sealing means E includes a second auxiliary sealing member 32 having a first annular .portion 32b, a flange portion 32a, and a second annular portion 32f formed integrally with the first annular portion 32b via a flange portion 32a, and is secured similarly to the first sealing means D.
  • FIGs 13 through 15 show further modifications of the interrupter of Figure 11.
  • a first auxiliary sealing member D includes a flange portion 30a, a first annular portion 30b, a second flange 30g and a second annular portion 30f, all which are formed integrally.
  • the first annular portion 30b fits sealingly within the housing 10, and second flange 30g is secured on an end of the housing 10.
  • An upper end plate 12 is fitted into the second annular portion 30f, sandwiching therebetween a metallized portion 34, to form the first sealing means D.
  • a second sealing means E includes a second auxiliary sealing member 32 formed similarly to the first auxiliary sealing member 30 and is constructured similar to the first sealing means D.
  • a first annular auxiliary sealing member 30 is secured to an outer stepped portion 10c of the housing 10, and an upper end plate 12 fits sealingly within the first annular auxiliary sealing member 30 and is fixed to an end of the housing 10.
  • Second sealing means E comprises a second annular auxiliary sealing member 32 secured to an outer stepped portion lOd, and a lower end plate 14 fitted sealingly within the second annular auxiliary sealing member 32 and fixed to an end of the housing 10.
  • a first auxiliary sealing member 30 has a flange 30a and a annular portion 30b.
  • the inner end of the flange 30a is securedto an outer stepped portion 10c of the housing 10, and an upper end plate 12 is fitted into and secured to the annular portion 30b sandwiching therebetween a metalized portion 34, to form first sealing means-D.
  • Second sealing means E includes a second auxiliary sealing member 32 which comprises a flange 32a and an annular portion 32b, and which is formed as described for the first sealing means D .
  • the mechanical strength against the mechanical shock generated in the interrupting operation is greatly increased, since the sealing portions are provided with curved stress-relieving portions.
  • FIG 16 shows a fifth embodiment of the vacuum power interrupter according to the present invention.
  • the vacuum power interrupter of this embodiment is characterized in that auxiliary sealing members are secured hermetically to both end portions of a metallic housing and are further secured to insulating end plates hermetically.
  • a first auxiliary sealing member 30 comprises a first flange portion 30a, a first annular portion 30b connected to the outer edge of the first flange 30a, a second flange 30g formed perpendicularly with respect to the first annular portion 30b, and a second annular portion 30c connected to the inner edge of the first flange 30a.
  • An end of a metallic housing 10 is secured to the second flange 30g.
  • a first supporting means F includes a U-shaped third auxiliary sealing member 38 for sealingly connecting a stationary contact rod 16 to an inner surface of the upper end plate 12.
  • a shielding member C includes a first curved auxiliary shield 52 which is secured to a second annular portion 30c of the first auxiliary sealing member 30 by means of spot welding, and a second curved auxiliary shield 54 which is secured to a second annular portion 32e of the second auxiliary sealing member 32 by means of spot welding.
  • Figure 17 shows a modification of the interrupter of Figure 16.
  • the differences between the interrupter of Figure 17 and the interrupter of Figure 16 reside in the shape of an auxiliary sealing member for aiding the positioning of auxiliary shields for brazing.
  • a first auxiliary sealing member 30 has a ring-shaped flange 30a and a curved portion 30c curved inwards and formed integrally with the flange 30a.
  • An end of a housing 10 is secured to the flange 30a of the first auxiliary sealing member 30; and an end of the curved portion 30c is secured to an end surface of a ring-shaped projection 12a of an upper end plate 12 by means of a metallized portion 34 secured by brazing to form the first sealing means D.
  • a second auxiliary sealing member 32 comprises a ring-shaped flange 32a and a curved portion 32c curved inwards and formed integrally with the flange 32a.
  • the flange 32a is, similar to the first auxiliary sealing member 30, secured to an end of the housing 10 and an end of the curved portion 32c of the second auxiliary sealing member 32 is secured to an end of a ring-shaped projection 14b of a lower end plate 14 by means of brazing such that the lower end plate 14 is spaced apart from the housing 10, in order to form second sealing means E.
  • a shielding member C includes a first auxiliary shield 52 which is curved inwards and a second auxiliary shield 54 curved inwards.
  • One end of the shield 52 is fixed to an inner surface of the curved portion 30c of the first auxiliary sealing member 30 by brazing or spot welding and the other end is brazed to the inner surface of the upper end plate 12.
  • An end of the shield 54 is secured to an inner surface of a lower end plate 14 by brazing, and an axial portion of the shield 54 is fastened to the curved portion 32c of the second sealing member 32 by brazing or spot welding.
  • FIG. 18 shows a sixth embodiment of the vacuum power interrupter according to the present invention.
  • auxiliary sealing members are provided with at least one curved portion for absorbing the mechanical stress generated by activation of the interrupter or by thermal stress during brazing.
  • One end of the auxiliary sealing member is secured to an end portion of the housing by means of brazing, and other end of the auxiliary sealing member is fastened to an end plate.
  • a cylindrical housing 10 is made of a non-magnetic metallic material such as an austenitic stainless steel of which the mechanical strength is relatively large.
  • the housing 10 has a flange 10e curved toward the axis of the housing 10.
  • a first auxiliary sealing member 30 comprises a flange portion 30a, an annular portion 30b curved at right angles with respect to the flange portion 30a, and a curved portion 30h curved into a semi-circular shape.
  • One end of the housing 10 is inserted into the annular portion 30b of the first auxiliary sealing member 30.
  • One end of the curved portion 30h is secured to the end of a projection 12b provided on the rim of an upper end plate 12, sandwiching a metallized portion 34 therebetween.
  • the first sealing means D comprises the first auxiliary sealing member 30 having the flange portion 30a, the first annular portion 30b extending at right angles and the semi-circular curved portion 30h, the end of the housing 10, which is inserted into the annular portion 30b of the first auxiliary sealing member 30, and the rim of the upper end plate 12 to which the end of the curved portion 30h of the first auxiliary sealing member 30.
  • the second sealing means E comprises an end of the housing 10, a second auxiliary sealing member 34 having a ring-shaped flange portion 32a, an annular portion 32b having a diameter smaller than that of the flange portion 32a, and a curved portion 32h formed integrally with the flange portion 32a and the annular portion 32b, and an end of a projection 14b which is secured to an end of the annular portion 32b of the second auxiliary sealing member 32.
  • First supporting means for supporting and securing hermetically a stationary contact rod includes a cup-shaped third auxiliary sealing member 38 and a ring-shaped metallized portion 34 provided on an upper surface of the upper end plate 12. One end of the third auxiliary sealing member 38 is fixed to a lower rod portion 16d of the stationary contact rod 16.
  • auxiliary sealing member 38 is secured to the upper surface of the upper end plate 12 by means of the metallized portion 34 to support the stationary contact rod 16.
  • auxiliary sealing members is made of a metal, such as Cu or Fe which is deformable by the thermal stress generated by the slow cooling after brazing.
  • a shielding member C comprises a first main arc-shield 56 mounted on the stationary contact rod 16, a first auxiliary shield 58 provided coaxially with respect to the first main arc-shield 56, a second main arc-shield 60 mounted on a movable contact rod 20 and a second auxiliary shield 62 provided coaxially with respect-to the second main arc-shield 60.
  • the first main arc-shield 56 comprises a first annular portion 56a fixed to the lower rod portion 16d and secured to a stationary electrical contact 18, a ring-shaped flat portion 56b formed integrally with the first tubular portion 56a and a second annular portion 56c formed integrally with the flat portion 56b and directed toward the upper end plate.
  • the second main arc-shield 60 is formed by a first annular portion 60a fitted to the movable contact rod 20 and fastened to a movable electrical contact 22, a ring-shaped flat portion 60b formed integrally with the first annular portion 60a and a second annular portion 60c formed integrally with the flat portion 60b and directed toward the lower end plate 14.
  • the first auxiliary shield 58 includes a first annular portion 58a having an outer diameter smaller than that of the first main arc-shield, a first flange portion 58b extending outwards from the first tubular portion 58a, a second annular portion 58c formed integrally with an outer edge of the first flange portion 58b; a second flange portion 58d extending outwards from the second annular portion 58c and having an outer diameter larger than that of the flange 10e of the housing 10 and a annular projection 58e projecting from the outer edge of the second flange portion 58d.
  • the second annular portion 58c of the first auxiliary shield 58 is mounted on the housing 10 by inseting the second annular portion 58c into the flange 10e of the housing 10 and engaging the second flange portion 58d to the outer surface of the flange 10e of the housing 10.
  • the upper end plate 12 fits into the corner between the second flange portion 58d and the projection 58e of the second auxiliary shield 58.
  • the second auxiliary shield 62 has a first annular portion 62a having a smaller diameter than that of the second main arc-shield 60 and coaxially located with the second main arc-shield 60, a flange portion 60b extending outwards from the first annular portion 60a and a second annular portion 60c formed integrally with the flange 60b.
  • the second annular portion 60c is inserted into the annular portion 32c of the second auxiliary sealing member 32 and is secured to the annular portion 32c of the second auxiliary sealing member 32 by means of spot welding.
  • the shielding member C is made of an austenitic stainless steel.
  • each of the auxiliary sealing members is provided with at least one curved portion, the impact force applied to the housing during interrupting operation is absorbed by the curved portion of the auxiliary member; similarly, thermal stress is absorbed by the curved portion. Since mechanical stress and thermal stress are eliminated, the diameter of the housing can be increased inexpensively and easily.
  • Figure 19 designates a modification of the interrupter of Figure 18.
  • a shielding member D includes an approximately disc-shaped first auxiliary shield 64 having an inner curved portion 64a which has a smaller diameter than that of the flange 10e of housing 10.
  • the first auxiliary shield 64 is made of an austenitic stainless steel and is fixed to the flange portion 10e by brazing.
  • the second auxiliary shield 28 has a ring-shaped flange portion 28b affixed to a second auxiliary sealing member 32 of second sealing means E.
  • the second auxiliary sealing member 32 of the second sealing means E has a flange portion 32a, a first annular portion 32b .formed integrally with the flange portion 32a and a circular projection 32g projecting from the outer edge of the flange portion 32a and having a larger diameter than the housing 10.
  • One end of the annular portion 32a is affixed to the upper surface of a lower end plate 14 by means of a metallized portion 34.
  • An end of the housing 10 is secured to the flange portion 32a of the second auxiliary sealing member 32 to form the second sealing means E.
  • Second supporting means G comprises a bellows 40, an upper end 40b of which is secured to a movable contact rod 20 and a lower end 40a of which is inserted into an aperture 14a provided in the central portion of the disc-shaped lower end plate 14 and brazed to a fourth auxiliary sealing member 66.
  • the fourth auxiliary sealing member 66 is made of a metallic material such as Cu or Fe and is U-shaped. An end of the fourth auxiliary sealing member 66 is secured to a metallized portion 34 provided on a ring-shaped projection which is fixed on the inner surface of the lower end plate 14 near the aperture 14a by brazing.
  • Figure 20 shows a vacuum power interrupter employing the present invention.
  • ring-shaped metallized portions 34 are provided on the central and peripheral projections 12c and 12b of the outside surface of an upper end plate 12 and on the central and peripheral projections 14c and 14b of the inside surface of a lower end plate 14.
  • a first auxiliary selaing member 30 is fitted to the upper end plate 12 such that a flange portion 30a engages with the projection 12b formed near the center of the upper end plate by way of the metallized portion 34 and a annular portion 30b is fitted to the outer edge surface of the upper end plate 12.
  • the annular portion 30b of the first auxiliary sealing member 30 is fitted and secured to a stepped portion 10a of a housing 10 to form a first sealing means D.
  • a second auxiliary sealing member 32 is fitted and secured to the lower end plate 14 such that a flange portion 32b engages with the projection 14b of the lower end plate 14 by way of the metallized portion 34 and an annular portion 32a is fitted to the outer edge surface of the lower end plate 14.
  • the annular portion 32a of the second auxiliary sealing member 32 is fitted and secured to a stepped portion 10b of the housing to form the second sealing means E.
  • Figure 21 shows a seventh embodiment of a vacuum power interrupter according to the present invention.
  • a part of a shielding member C is made of a metallic material which is deformed by the thermal stress generated in cooling after brazing and is employed in an auxiliary sealing member to aid sealing between the metallic material and the insulating material.
  • the shielding member C comprises a first main arc-chield 22 mounted on a stationary contact rod 16, a first auxiliary shield 70, a second main arc-shield 26 mounted on a movable contact rod 20 and a second. auxiliary shield 72.
  • the first auxiliary shield 70 is made of a metallic material, such as Cu or Fe, which is deformed by the thermal stress in slow cooling after the brazing.
  • the first auxiliary shield 70 comprises an annular portion 70a and a flange portion 70b extending outwards from the annular portion 70a.
  • One end of the flange portion 70b of the first auxiliary shield 70 is disposed between a stepped portion 10a of a housing 10 and an upper end plate 12 to be employed as a first auxiliary sealing member 30 of first sealing means D.
  • the second shield 72 is made of the same material as that of the first auxiliary shield 70.
  • the second auxiliary shield 72 is formed by a tubular portion 72a and a flange portion 72b outwardly extending from the tubular portion 72a.
  • An end portion of the flange portion 72b is fitted between a stepped portion 10b of the housing 10 and a lower end plate 14 and is also employed as a second auxiliary sealing member 32 of second sealing means E.
  • the number of elements of the interrupter is reduced and thereby the constructual of the interrupter is simplified, since a part of element of the shielding member C is made of a metallic material such as Cu or Fe which is deformed by the thermal stress in brazing and is employed as the auxiliary sealing member for aiding the sealing the interrupter. It is easy to position the auxiliary shield in the envelope, because the auxiliary shields are fitted between the end plates and the end portions of the housing.
  • the stepped portions are provided in order to secure the shields in the embodiment stated above, the stepped portions may be omitted and stepped portions may be provided on end portions of the shields in order to secure the shields.
  • the vacuum power interrupters shown in Figures 5 to 21 are manufactured by the same method as that of the vacuum power interrupter shown in Figure 1 to 4.

Landscapes

  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
EP19810302900 1980-06-30 1981-06-26 Vakuumschalter und Verfahren zur Herstellung desselben Expired EP0043258B1 (de)

Applications Claiming Priority (12)

Application Number Priority Date Filing Date Title
JP8875080A JPS5713637A (en) 1980-06-30 1980-06-30 Vacuum breaker and method of producing same
JP88750/80 1980-06-30
JP9256080A JPS5717526A (en) 1980-07-07 1980-07-07 Vacuum breaker
JP92560/80 1980-07-07
JP9303880A JPS5717529A (en) 1980-07-08 1980-07-08 Vacuum breaker
JP93038/80 1980-07-08
JP99694/80 1980-07-21
JP9969380A JPS5725631A (en) 1980-07-21 1980-07-21 Vacuum breaker
JP9969480A JPS5725632A (en) 1980-07-21 1980-07-21 Vacuum breaker
JP9969680A JPS5725634A (en) 1980-07-21 1980-07-21 Vacuum breaker
JP99693/80 1980-07-21
JP99696/80 1980-07-21

Publications (3)

Publication Number Publication Date
EP0043258A2 true EP0043258A2 (de) 1982-01-06
EP0043258A3 EP0043258A3 (en) 1982-06-09
EP0043258B1 EP0043258B1 (de) 1985-12-11

Family

ID=27551749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810302900 Expired EP0043258B1 (de) 1980-06-30 1981-06-26 Vakuumschalter und Verfahren zur Herstellung desselben

Country Status (2)

Country Link
EP (1) EP0043258B1 (de)
DE (1) DE3173186D1 (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0051475A3 (en) * 1980-11-05 1983-03-09 Kabushiki Kaisha Meidensha A vacuum interrupter
EP0080315A1 (de) * 1981-11-20 1983-06-01 Kabushiki Kaisha Meidensha Vakuumschalter
EP0095327A1 (de) * 1982-05-20 1983-11-30 Kabushiki Kaisha Meidensha Vakuumschalter
EP0129080A1 (de) * 1983-05-20 1984-12-27 Kabushiki Kaisha Meidensha Vakuumschalter
EP0131798A3 (de) * 1983-07-14 1985-09-18 Siemens Aktiengesellschaft Gehäuse einer Vakuumschaltröhre
DE4039086A1 (de) * 1990-12-07 1992-06-11 Schlafhorst & Co W Spulenwickelvorrichtung und verfahren zu ihrem betrieb
EP0780868A3 (de) * 1995-12-21 1999-04-28 Alstom Uk Ltd Elektrisch leitender Schirm für einen Vakuumschalter
CN113150743A (zh) * 2021-04-19 2021-07-23 山东理工大学 钎焊增强等离子熔融金属微液滴与磨料粉末结合快凝磁性磨料制备方法
CN113593970A (zh) * 2021-07-05 2021-11-02 科润智能控制股份有限公司 一种中压真空断路器
WO2025067874A1 (de) * 2023-09-28 2025-04-03 Siemens Aktiengesellschaft Verbesserter metallbalg und vakuumschaltröhre mit einem solchen verbesserten metallbalg

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3628174A1 (de) * 1986-08-20 1988-02-25 Calor Emag Elektrizitaets Ag Vakuum-schaltkammer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1045305B (de) * 1956-04-18 1958-11-27 Telefunken Gmbh Verfahren zum Verbinden nichtmetallischer Stoffe, wie Keramik, mit Metallen und danach hergestellte elektrische Entladungsroehre
US3674958A (en) * 1970-11-23 1972-07-04 Allis Chalmers Mfg Co Vacuum circuit interrupter
US3727018A (en) * 1971-09-16 1973-04-10 Allis Chalmers Disk vacuum power interrupter
DD101056A1 (de) * 1972-12-20 1973-10-12
NL178680C (nl) * 1979-03-05 1986-05-01 Hazemeijer Bv Werkwijze voor het tot stand brengen van een stompe hardsoldeerverbinding tussen metaal en keramisch materiaal.

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0051475A3 (en) * 1980-11-05 1983-03-09 Kabushiki Kaisha Meidensha A vacuum interrupter
EP0080315A1 (de) * 1981-11-20 1983-06-01 Kabushiki Kaisha Meidensha Vakuumschalter
US4499349A (en) * 1981-11-20 1985-02-12 Kabushiki Kaisha Meidensha Vacuum interrupter
US4547638A (en) * 1982-05-20 1985-10-15 Kabushiki Kaisha Meidensha Vacuum interrupter
EP0095327A1 (de) * 1982-05-20 1983-11-30 Kabushiki Kaisha Meidensha Vakuumschalter
EP0129080A1 (de) * 1983-05-20 1984-12-27 Kabushiki Kaisha Meidensha Vakuumschalter
US4528432A (en) * 1983-05-20 1985-07-09 Kabushiki Kaisha Meidensha Vacuum interrupter
EP0131798A3 (de) * 1983-07-14 1985-09-18 Siemens Aktiengesellschaft Gehäuse einer Vakuumschaltröhre
DE4039086A1 (de) * 1990-12-07 1992-06-11 Schlafhorst & Co W Spulenwickelvorrichtung und verfahren zu ihrem betrieb
EP0780868A3 (de) * 1995-12-21 1999-04-28 Alstom Uk Ltd Elektrisch leitender Schirm für einen Vakuumschalter
CN113150743A (zh) * 2021-04-19 2021-07-23 山东理工大学 钎焊增强等离子熔融金属微液滴与磨料粉末结合快凝磁性磨料制备方法
CN113593970A (zh) * 2021-07-05 2021-11-02 科润智能控制股份有限公司 一种中压真空断路器
CN113593970B (zh) * 2021-07-05 2025-11-21 科润智能控制股份有限公司 一种中压真空断路器
WO2025067874A1 (de) * 2023-09-28 2025-04-03 Siemens Aktiengesellschaft Verbesserter metallbalg und vakuumschaltröhre mit einem solchen verbesserten metallbalg

Also Published As

Publication number Publication date
EP0043258B1 (de) 1985-12-11
DE3173186D1 (en) 1986-01-23
EP0043258A3 (en) 1982-06-09

Similar Documents

Publication Publication Date Title
US4394554A (en) Vacuum circuit interrupter
EP0043258A2 (de) Vakuumschalter und Verfahren zur Herstellung desselben
US5222651A (en) Process for producing a vacuum interrupter chamber
US4408107A (en) Vacuum interrupter
EP0187033A2 (de) Magnetron mit einem Keramiksockel versehen mit einer Kathodenhalterungsvorrichtung
EP1172834B1 (de) Verfahren und Vorrichtung zur Befestigung eines Dampfschildes in einen Vakuumschalter, und damit versehener Vakuumschalter
EP0029691B1 (de) Vakuum-Leistungsschalter
KR100443325B1 (ko) 진공엔벨로프와,진공단속기용피복단부시일및그제조방법
EP0129080B1 (de) Vakuumschalter
EP0040933B1 (de) Vakuumschalter
JP3361932B2 (ja) 真空バルブ
US4665287A (en) Shield assembly of a vacuum interrupter
US4450327A (en) Vacuum interrupter
US4417110A (en) Vacuum interrupter
EP0080315B1 (de) Vakuumschalter
EP0030852B1 (de) Vakuum-Leistungsschaltvorrichtung
US4481390A (en) Vacuum circuit interrupter
US4414448A (en) Vacuum circuit interrupter
US4630361A (en) Process for preparing a vacuum switch tube
EP0050955B1 (de) Vakuumschalter
US3996437A (en) Vacuum contactor for motor control and method of making
US4733456A (en) Method of assembling a shield assembly of a vacuum interrupter
EP0043186B1 (de) Vakuumschalter
EP0718860A2 (de) Vakuumschalter
CN86106540A (zh) 真空断路器壳组合件

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19811014

AK Designated contracting states

Designated state(s): CH DE FR GB IT NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): CH DE FR GB IT NL SE

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

ITF It: translation for a ep patent filed
AK Designated contracting states

Designated state(s): CH DE FR GB IT LI NL SE

ET Fr: translation filed
REF Corresponds to:

Ref document number: 3173186

Country of ref document: DE

Date of ref document: 19860123

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19890628

Year of fee payment: 9

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19890630

Year of fee payment: 9

Ref country code: GB

Payment date: 19890630

Year of fee payment: 9

Ref country code: FR

Payment date: 19890630

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19890714

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19890811

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19900626

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19900627

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19900630

Ref country code: CH

Effective date: 19900630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19910101

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19910228

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19910301

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 81302900.6

Effective date: 19910206