Vacuum valve and manufacturing method for the same

Patent metadata

Field	Value
Publication number	US-9972467-B2
Application number	US-201615217581-A
Country	US
Kind code	B2
Filing date	Jul 22, 2016
Priority date	Jan 24, 2014
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A vacuum valve according to embodiments of the present disclosure comprise a prescribed shaped vacuum insulation vessel 1 having openings on its both ends, sealing metal fittings 2,3 configured to seal the openings of the vacuum insulation vessel 1 respectively, and a pair of contact points 5,6 which can be brought into contact or out of contact with each other and is arranged within the vacuum insulation vessel 1 , wherein the vacuum insulation vessel 1 includes a base material layer 1 c of aluminum oxide, a 1st oxidization promotion layer 1 a whose oxygen combination was promoted, which 1st oxidization promotion layer 1 a is formed on the inner circumference of the base material layer 1 c , and a 2nd oxidization promotion layer 1 b whose oxygen combination was promoted, which 2nd oxidization promotion layer 1 b is formed on the outer circumference of the base material layer 1 c.

First claim

What is claimed is:

1. A vacuum valve, comprising:
a cylindrical shaped vacuum insulation vessel having openings on both ends;
sealing metal fittings configured to seal the openings of the vacuum insulation vessel; and
a pair of contact points which can be brought into contact or out of contact with each other and arranged within the vacuum insulation vessel,
wherein the vacuum insulation vessel includes:
a base material layer of aluminum oxide;
a first oxidization promotion layer whose oxygen combination was promoted, said first oxidization promotion layer formed on an inner circumference of the base material layer; and
a second oxidization promotion layer whose oxygen combination was promoted, said second oxidization promotion layer formed on an outer circumference of the base material layer.

2. The vacuum valve of claim 1 , wherein thickness of the first oxidization promotion layer or the second oxidization promotion layer on a side of the openings is thicker than the thickness on an opposite side of the openings.

3. The vacuum valve of claim 1 , wherein an insulating layer molded by insulating material is formed in surroundings of the vacuum insulation vessel.

4. A manufacturing method for a vacuum valve, comprising:
a calcining step of calcining aluminum oxide fabricated by cylindrical shape having openings on both ends and heating the aluminum oxide in a first temperature range;
a re-heating step of re-heating the calcined aluminum oxide at a second temperature which is on high temperature side of the first temperature range, forming a first oxidization promotion layer whose oxygen combination was promoted, said first oxidization promotion layer formed on an inner circumference of the aluminum oxide, and forming a second oxidization promotion layer whose oxygen combination was promoted, said second oxidization promotion layer formed on an outer circumference of the aluminum oxide;
a disposing step of disposing a pair of contact points which can be brought into contact or out of contact with each other inside of the aluminum oxide from openings; and
a sealing step of sealing the openings by sealing metal fittings.

5. The manufacturing method for the vacuum valve of claim 4 , wherein the re-heating step is repeated.

6. The manufacturing method for the vacuum valve of claim 4 , wherein the second temperature is greater than or equal to 1250 Celsius degrees.

Assignees

• Toshiba Kk

Inventors

• Asari Naoki
• Sato Junichi
• Shioiri Tetsu
• Sekimori Yuki

Classifications

• H01H2033/66284

  Details relating to the electrical field properties of screens in vacuum switches · CPC title

• H01H33/24

  Means for preventing discharge to non-current-carrying parts, e.g. using corona ring · CPC title

• H01H2033/6623

  Details relating to the encasing or the outside layers of the vacuum switch housings · CPC title

• H01H33/66207 Primary

  Specific housing details, e.g. sealing, soldering or brazing · CPC title

• H01H11/00

  Apparatus or processes specially adapted for the manufacture of electric switches (processes specially adapted for manufacture of rectilinearly movable switches having a plurality of operating members associated with different sets of contacts, e.g. keyboards, H01H13/88) · CPC title