RU2054726C1 - Process of manufacture of vacuum arc chute - Google Patents

Abstract

FIELD: electrical engineering. SUBSTANCE: process includes assembly and soldering of mobile and immobile current leads, potting of recessions of contacts with fusible material, positioning of mobile current lead in upper flange with advance placement of solder with soldering temperature below that of complete melting of fusible material and above temperature of degassing of chute between them, heating in vacuum and soldering. EFFECT: avoidance of operation of welding of chute units, exclusion of operation of air evacuation and of chute sealing, soldering of units of family of chutes in deep vacuum. 3 dwg

Description

 The invention relates to electrical engineering, specifically to a technology for manufacturing vacuum arcing chambers with fusible material in the recesses of the contacts.

A known method of manufacturing a vacuum interrupter chamber, in which the current leads are soldered with solder at a temperature of 950 ^about With high vacuum. Kovirovye ring current leads soldered to the ceramic at a temperature below 850 ^{° C} in vacuo, providing the tightness of the case [1]
The disadvantage of this method is the high temperature of the second soldering stage, leading to melting and loss of fusible material from the recesses of the contacts, which makes it impossible to use this method for manufacturing chambers with fusible material in the contacts.

The closest in technical essence and attainable result to the present method is a method of manufacturing a vacuum chamber in which is performed a rolling assembly and brazing of the movable, stationary current leads, pouring recesses fusible material contacts, argon-arc welding of nodes interconnected, vacuum degassing at a temperature of 450 ^C. , pumping and sealing through a shtangelny tube [2]
The disadvantage of this method, adopted as a prototype, is its low productivity, due to the need to weld the current leads to the housing, degassing, pumping the chamber and sealing it with expensive special technological equipment.

 The purpose of the invention is to increase the productivity of manufacturing vacuum interrupter chambers. In the course of solving the problem, the following technical result was obtained: the operation of welding the camera nodes together, pumping out and sealing the cameras was excluded; only soldering of the nodes of the group of chambers in a deep vacuum was used.

 The goal is achieved by the fact that in the method of manufacturing a vacuum arcing chamber, including the assembly of the upper flange, ceramic insulator, lower flange, bellows and a movable current lead with the placement of solder between them, heating and soldering them, filling the contact cavities with fusible material, after filling the contact cavities the stationary current lead installed in the upper flange with preliminary placement of solder between them with a soldering temperature below the full melting temperature of the fusible material and above the degassing temperature tion of the chamber, heated in vacuum and soldered.

 The installation of a fixed current lead in the upper flange with preliminary placement of solder between them with a soldering temperature below the full melting temperature of the fusible material and above the chamber degassing temperature makes it possible to simultaneously produce a group of chambers from a set of parts. In addition, the inventive method eliminates the operation of welding the camera nodes together, pumping and sealing.

 The simultaneous manufacture of a group of chambers and the exclusion of welding of camera assemblies can improve productivity.

 In FIG. 1 shows a soldered movable current lead; in FIG. 2 soldered fixed current lead; in FIG. 3 finished camera. The movable current lead consists of an upper flange 1, a ceramic insulator 2, a lower flange 3, a bellows 4. a screen 5, a rod 6 with a contact 7, the recess of which is filled with fusible material 8. A soldered fixed current lead consists of a sleeve 9, a rod 10, contact 11, a recess which is also filled with fusible material 8. In the finished chamber, the flange 1 is soldered with a fixed current lead solder 12.

PRI me R. From a set of parts for a movable current lead: upper flange 1, ceramic insulator 2, lower flange 3, bellows 4, screen 5, rod 6, contact 7, and a fixed current lead: sleeve 9, rod 10, contact 11 assemble the nodes with the placement of solder 72 solder at a temperature of 820 ^C. The recesses contacts 7, 11 are filled by melting the fusible material consisting of a tin-antimony alloy, at a lower temperature ^of 670 C in a hydrogen environment. Establish a fixed current lead in the upper flange 1 with the interposition of the preliminary solder 12 constituting SEP alloy 72 with 32% indium soldering temperature ^of 610 C and under a load placed in the furnace. In an oven under high vacuum at P 10 ^-3 Pa and a temperature of 450 ^{° C} degassed chamber material and pumping it through the nip in place of compound 1 and a flange fixed current lead. Solder 12 is in the solid state during degassing and evacuation. After completion of the degassing, which lasted 2 hours, produce a temperature rise to 610 ^{° C} and soldering chamber, providing its tightness.

Claims (1)

 METHOD FOR PREPARING A VACUUM ARC CHAMBER, including assembling and soldering the movable and fixed current leads and filling the contact cavities with fusible materials, characterized in that after filling the contact cavities the stationary current lead is installed in the upper flange of the movable current lead, the pre-heater is placed between them with the solder below the temperature fusible material and above the degassing temperature of the chamber, heated in vacuum and soldered.

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