JPH03283335A - Discharge tube - Google Patents

Abstract

PURPOSE:To obtain a high-voltage discharge tube which has breaking resistance and leakage resistance even when a high pressure inactive gas is sealed therein by covering the outer surface of a sealed container except the terminal portions of main electrodes with an insulating material. CONSTITUTION:A sealed container 23 provided in such a manner as enclosing two main electrodes 21, 22 therein is covered at its outer surface except the terminal portions of the main electrodes 21, 22 with an insulating material 25; i.e., the sealed container 23 made of ceramics is sealed and stuck to the electrode 21 and a welding ring 23a in advance and the welding ring 23a and the electrode 22 are electrically welded to each other in the atmosphere of a high pressure inactive gas 24 during assembly of a discharge tube and the ceramics sealed container 23 is coated at its outer surface with the insulating material 25 of good adhesion such as epoxy resins, etc., and so can withstand high pressure. A high-voltage discharge tube having atmospheric gas 24 of pressure higher than atmospheric pressure sealed therein is thus obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-voltage discharge tube that can prevent deterioration over time and has a high withstand voltage.

[Conventional technology]

Conventionally, in this type of discharge tube, a pair of opposing electrodes 101 and 102 have been sealed together with an inert gas 104 in a closed ceramic container 103, as shown in FIG.

[Problem to be solved by the invention]

However, in the above-mentioned conventional discharge tube, since the sealed container is made of porous material (ceramic), the pressure of the gas filled in the discharge tube cannot be raised above atmospheric pressure, and therefore high-pressure discharges of tens of thousands of V or more are not possible. The design of the tube was difficult.

[Means to solve the problem]

The discharge tube of the present invention includes two main electrodes arranged opposite to each other and a sealed container provided to enclose these electrodes, the discharge tube having a sealed container except for a terminal portion of the main electrodes. It is characterized by covering the outer surface of the container with an insulating material.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

The electrode 11 is hermetically sealed and integrated with an airtight container 3 made of a metal material, for example, by an insulating part 13a made of glass or the like. The discharge tube is assembled by electrically welding the electrode I2 to the closed vessel I3 in an atmosphere of high pressure inert gas 14 that provides the necessary high voltage discharge characteristics. This electric welding
This must be done on the entire surface of the sealed container I3 and the electrode 12 to ensure airtightness, and if necessary, the sealed container 1
If a concentric protrusion is provided on either the electrode 3 or the electrode 12, airtightness will be further ensured. In addition, electrode 11 and electrode 1
In order to increase the withstand voltage between the two poles, the part where the two poles appear (the part where the two poles are close to each other) is coated with an insulating material with good adhesion such as epoxy resin15 to increase the creepage distance between the two poles. ing.

FIG. 2 is a longitudinal sectional view of another embodiment of the invention.

The sealed container 23 made of a ceramic material is hermetically bonded to the electrode 21 and the welding ring 23a in advance, and when assembling the discharge tube, the welding ring 23a and the electrode 22 are bonded together in an atmosphere of a high-pressure inert gas 24. Electric welding is performed between. Ceramic materials are excellent materials with high insulating properties and mechanical durability, so they are often used in low-voltage discharge tubes filled with atmospheric scum at a pressure below atmospheric pressure, but as mentioned above, Ceramic is not suitable for high-voltage discharge tubes filled with pressurized atmospheric gas because of its porous nature. However, in this embodiment, the outer surface of the ceramic sealed container 23 is coated 25 with a highly adhesive insulating material such as epoxy resin, so that it can withstand high pressure.

〔Effect of the invention〕

As explained above, the present invention has the effect of realizing a high voltage discharge tube with a simple structure that is resistant to destruction and leakage even when filled with high pressure inert gas.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention, FIG. 2 is a longitudinal sectional view of another embodiment of the invention, and FIG. 3 is a longitudinal sectional view of a conventional discharge tube. 11.12.21... Electrode, 13.23...
... Airtight container, 13a ... Insulation section, 23a.
...Welded pipe, 14.24...Inert gas, 15.25...Coating.

Claims (3)

[Claims] (1) In a discharge tube equipped with two main electrodes arranged facing each other and a sealed container provided to enclose these electrodes, the outer surface of the sealed container excluding the terminal portion of the main electrodes is A discharge tube characterized by being covered with an insulating material. (2) The discharge tube according to claim 1, wherein the sealed container is made of a ceramic material, and the outer surface of the sealed container is covered with an insulating resin. (3) The discharge tube according to claim (1), wherein the sealed container is made of a metal material, and a boundary between at least one of the electrodes and the sealed container is covered with an insulating resin.