WO2020031437A1

WO2020031437A1 - Vacuum switch and method for manufacturing same

Info

Publication number: WO2020031437A1
Application number: PCT/JP2019/017192
Authority: WO
Inventors: 中山　靖章; 佐藤　隆; 小林　将人; 幸三田村; 裕己田井
Original assignee: 株式会社日立産機システム
Priority date: 2018-08-07
Filing date: 2019-04-23
Publication date: 2020-02-13
Also published as: JP6968764B2; JP2020024839A

Abstract

The present invention provides a solid insulation-type vacuum switch with which the concentration of an electrical field at triple points of end sections of an insulated cylinder that are weak insulation points of the solid insulation-type vacuum switch is mitigated, insulation reliability is improved, and mechanical strength is improved. This vacuum switch has a fixed electrode, a moveable electrode that faces the fixed electrode, an insulated cylinder that is formed around the fixed electrode and the moveable electrode, end plates that abut axial end sections of the insulated cylinder and cover the insulated cylinder from the axial direction of the cylinder, a buffer material the covers the outsides of the insulated cylinder and the end plates, and a solid insulator that covers the outside of the buffer material. The vacuum switch has first coil springs that abut the end sections of the insulated cylinder and the end plates, and has second coil springs that are formed so as to abut respective portions of the first coil springs that are not covered by the buffer material and face the insulated cylinder with the buffer material interposed therein.

Description

Vacuum switch and manufacturing method thereof

The present invention relates to a solid insulation type vacuum switch and a method for manufacturing the same.

The solid insulation type vacuum switch is a switch with enhanced insulation performance by covering the periphery of the vacuum vessel containing the shut-off section with a solid insulator. However, there is a possibility that the electric field is concentrated at the end of the insulating cylinder that constitutes the vacuum vessel, and this is also a part where dielectric breakdown easily occurs. Even if the periphery (the end of the insulating cylinder) is covered with a solid insulator, Concerns about dielectric breakdown remain.

に対して With respect to such a problem, there is JP 2010-10008 A (Patent Document 1). In Patent Literature 1, a fixed electrode lead and a movable electrode lead are disposed opposite to each other in a vacuum container including an insulating cylinder, and a fixed electrode and a movable electrode are attached to the inner end of each electrode lead, respectively. In order to hermetically seal both ends of the tube, both ends of the insulating tube are fixed with fixed electrode side end plates and movable electrode side end plates, and a central shield surrounding both electrodes is used to prevent contamination of the inner peripheral surface of the insulating tube. The inner end shield and the outer end shield are provided in the insulating cylinder and concentric with the respective electrode side end plates so as to cover the adhesion part in order to reduce the electric field of the adhesion part between the insulating cylinder and each electrode side end plate. It is described that a vacuum container is provided inside and outside the vacuum container (see abstract).

There is also JP 2010-40347 (Patent Document 2). Patent Literature 2 discloses a fixed electrode, a movable electrode facing the fixed electrode, and an end plate and an insulating cylinder having a metal-baked surface on a joint surface between the end plate and the fixed electrode and the movable electrode. A vacuum container, a solid insulating resin molded outside the vacuum container, a first coil spring that is in contact with the end plate and a metal-baked surface of the insulating cylinder, and is disposed on an outer periphery of the end plate; A second coil spring disposed in contact with and covering an outer periphery of the insulating cylinder so as to cover a corner of the metal-baked surface of the insulating cylinder; and an end plate, a metal-baked surface of the insulating cylinder, the first coil spring, and the second coil spring. It is described that it is electrically connected to a coil spring (see abstract).

JP 2010-10008 A JP 2010-40347 A

Patent Documents

1 and 2 disclose a vacuum switchgear and a vacuum switch that reduce the concentration of an electric field at the end of an insulating cylinder and prevent dielectric breakdown. However, the vacuum switchgear and the vacuum switch described in Patent Literature 1 and Patent Literature 2 do not have a cushioning material between the end plate and the solid insulator, and have an external end plate shield (see Patent Document 1). And the first coil spring (see Patent Document 2) are covered with a solid insulator.

Accordingly, the present invention is directed to a solid-insulated vacuum switch in which the concentration of an electric field at the triple point at the end of the insulating cylinder, which is the insulating weak point, is alleviated, thereby improving insulation reliability and improving mechanical strength. Provide an insulated vacuum switch.

In order to solve the above problems, a vacuum switch of the present invention includes a fixed electrode, a movable electrode opposed to the fixed electrode, and an insulating tube (fixed-side insulating tube or movable-side insulating tube) formed around the fixed electrode and the movable electrode. End plate (fixed end plate or movable end plate) that contacts the axial end (fixed end or movable end) of the insulating tube and covers the insulating tube from the axial direction; And a cushioning material that covers the outside of the end plate, and a solid insulator that covers the outside of the cushioning material. The first cushioning member is in contact with an end of the insulating cylinder and the end plate, and a part of the cushioning material is covered by the cushioning material. And a second coil spring formed in contact with a portion of the first coil spring that is not covered with the cushioning material, and opposed to the insulating cylinder via the cushioning material.

According to the present invention, the concentration of the electric field at the triple point at the end of the insulating cylinder, which is the insulation weak point of the solid insulation type vacuum switch, is reduced, and the insulation reliability is improved and the mechanical strength is improved. An insulated vacuum switch can be provided.

The problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

It is an explanatory view showing the whole composition of a vacuum switch of this example. It is explanatory drawing which shows how to attach the 1st coil spring of the vacuum switch of this Example. It is explanatory drawing which shows the range in which the buffer material of the vacuum switch of this Example is formed. It is explanatory drawing which shows how to attach the 2nd coil spring of the vacuum switch of this Example. It is explanatory drawing which shows the equipotential line distribution of the vacuum switch of a present Example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same components are denoted by the same reference numerals, and in cases where the description is duplicated, the description may be omitted.

FIG. 1 is an explanatory diagram showing the overall configuration of the vacuum switch of the present embodiment.

The vacuum switch 1 described in the present embodiment has a fixed electrode 2 and a movable electrode 3 facing the fixed electrode 2.

An insulating cylinder (7A and 7B) is formed around the fixed electrode 2 and the movable electrode 3.
The insulating cylinder formed around the fixed electrode 2 is a fixed insulating cylinder 7A, and the insulating cylinder formed around the movable electrode 3 is a movable insulating cylinder 7B.

A movable end contacts the fixed end plate 11 in contact with the fixed end of the fixed insulation tube 7A in the axial direction and covers the fixed insulation tube 7A in the axial direction, and a movable end in the axial direction of the movable insulation tube 7B. A movable side end plate 12 that covers the side insulating cylinder 7B from the axial direction.

緩衝 It has a buffer member 13 covering the outside of the fixed-side insulating tube 7A, the movable-side insulating tube 7B, the fixed-side end plate 11, and the movable-side end plate 12, and a solid insulator 14 covering the outside of the buffer member 13.

Further, the first coil spring 21 which is in electrical contact with the fixed side end (a metal-baked portion to be described later) of the fixed side insulating cylinder 7A and the fixed side end plate 11 and which is partially covered with the cushioning material 13 is provided. A second coil spring 22 electrically connected to a portion of the first coil spring 21 that is not covered with the cushioning material 13 and opposed to the fixed-side insulating cylinder 7A via the cushioning material 13; And

Similarly, a first coil spring 21 that is in electrical contact with the movable side end (metal-baked portion described later) of the movable side insulating cylinder 7B and the movable side end plate 12 and that is partially covered with the buffer material 13 And a second coil spring 22 electrically connected to a portion of the first coil spring 21 which is not covered with the cushioning material 13 and opposed to the movable insulating cylinder 7B via the cushioning material 13. And

In other words, the fixed-side insulating cylinder 7A, the movable-side insulating cylinder 7B, and the fixed-side end plate made of metal, which are connected to the fixed-side end of the fixed-side insulating cylinder 7A in the axial direction and are thinner than the fixed-side insulating cylinder 7A. And a movable side end plate 12 connected to the movable side end of the movable side insulating cylinder 7B in the axial direction and having a smaller thickness than the movable side insulating cylinder 7B. Is kept in a high vacuum state (0.1 Pa or less). The cushioning material 13 is formed so as to cover the periphery of such a vacuum vessel.

固定 Inside the vacuum vessel, there are arranged a fixed electrode 2 and a movable electrode 3 which faces the fixed electrode 2 and is movable in the axial direction. The fixed electrode 2 is held at the tip of a fixed electrode rod 8 that communicates in the axial direction with a fixed side end plate 11 that forms a vacuum vessel. The movable electrode 3 moves the movable side end plate 12 that forms a vacuum vessel in the axial direction. Is held at the tip of the movable-side electrode rod 9 communicating with.

A movable-side conductor (not shown) is connected to an end of the movable-side electrode bar 9 opposite to an end at which the movable electrode 3 is held in the axial direction, and is connected to one of the bus side and the load side. Is electrically connected to A fixed-side conductor (not shown) is connected to an end of the fixed-side electrode rod 8 opposite to the end at which the fixed electrode 2 is held in the axial direction. Is electrically connected to the other.

(4) The movable electrode rod 9 is operated in an axial direction (up and down direction in FIG. 1) by an operating device (not shown) to move the movable electrode 3 and to move the fixed electrode 2 and the movable electrode 3 toward and away from each other.

Further, a guide 10 held by a movable end plate 12 is arranged around the movable electrode bar 9 on the side opposite to the end at which the movable electrode 3 is held in the axial direction. The movable electrode rod 9 can smoothly move up and down without being axially displaced with respect to the axial direction which is the operation direction.

A bellows supported by a movable end plate 12 is provided around the movable electrode rod 9 so that a vacuum state inside the vacuum vessel can be maintained even when the movable electrode rod 9 moves up and down in the axial direction. 5 are arranged.

Around the bellows 5, metal fine particles scattered by an arc generated between the electrodes (between the fixed electrode 2 and the movable electrode 3) during the opening / closing operation are prevented from adhering to the bellows 5, and an end of the bellows 5 is formed. In order to reduce the electric field concentration, a bellows shield 6 is supported and arranged on the movable electrode rod 9.

An arc shield is provided around the fixed electrode 2 and the movable electrode 3 to prevent metal particles scattered in an arc generated between the electrodes during the opening and closing operation from adhering to the inner surface of the vacuum vessel and deteriorating the insulation performance. 4 are arranged and supported by the fixed insulating cylinder 7A and the movable insulating cylinder 7B.

外側 The outside of the vacuum vessel is covered with a rubber cushioning material 13, and the outside is further covered with a solid insulator 14 such as an epoxy resin. The cushioning material 13 is made of a fixed-side insulating cylinder 7A made of ceramics, a movable-side insulating cylinder 7B made of ceramics, a fixed-side end plate 11 made of metal such as copper or stainless steel, and a movable end plate 11 made of metal such as copper or stainless steel. It is installed in order to reduce stress concentration based on the difference in the heat shrinkage between the side end plate 12 and the solid insulator 14.

For this reason, the cushioning material 13 is a material that plays a role of thermal stress relaxation between the solid insulator 14 and the fixed-side insulating tube 7A, the movable-side insulating tube 7B, the fixed-side end plate 11, the movable-side end plate 12, and the like. Elastic materials such as rubber are preferred.

緩衝 It is also preferable to provide the cushioning material 13 between the fixed-side end plate 11 and the solid insulator 14 and between the movable-side end plate 12 and the solid insulator 14. Thereby, mechanical strength can be improved.

A joint surface between the fixed-side insulating tube 7A and the fixed-side end plate 11 (a surface in contact with the fixed-side end plate 11 at the fixed-side end portion of the fixed-side insulating tube 7A in the axial direction), and a movable-side insulating tube 7B and the movable side A fixed surface end plate 11 made of metal and a movable end plate made of metal are provided on a joint surface with the end plate 12 (a surface which is in contact with the movable end plate 12 at an axially movable end portion of the movable insulating cylinder 7B). In order to join with the metal 12, metal baking (metallization) with good compatibility with the metal is performed, and a metal-baked portion is formed.

This joint portion (the portion where the joint surface of the fixed-side end of the fixed-side insulating cylinder 7A in the axial direction and the fixed-side end plate 11 are in contact with each other; The portion where the joint surface and the movable side end plate 12 are in contact with each other), that is, the metal-baked portion becomes a triple junction (triple junction) because it becomes a boundary between three materials, and emits electrons which causes dielectric breakdown. It is an easy place. For this reason, it is necessary to take measures to prevent a strong electric field from being applied to this junction.

In this embodiment, a first coil spring 21 which is in contact with the fixed-side end (metal-baked portion) of the fixed-side insulating cylinder 7A and the fixed-side end plate 11 and is partially covered with the cushioning material 13; A second coil spring 22 that is in contact with a portion of the first coil spring 21 that is not covered by the cushioning material 13 and that is opposed to the fixed-side insulating cylinder 7A via the cushioning material 13; Similarly, the first coil spring 21 which is in contact with the movable side end (metal-baked portion) of the movable side insulating cylinder 7B and the movable side end plate 12 and a part of which is covered by the buffer material 13; A second coil spring 22 is formed so as to be in contact with a portion of the coil spring 21 that is not covered by the cushioning material 13 and to face the movable-side insulating cylinder 7B via the cushioning material 13.

That is, in the present embodiment, the cushioning material 13 is also provided between the end plate (the fixed-side end plate 11 or the movable-side end plate 12) and the solid insulator 14, and the first coil spring 21 is formed by the cushioning material 13. Is characterized by being partially covered. A second coil spring 22 is provided so as to be in electrical contact with a portion of the first coil spring 21 which is not covered with the cushioning material 13, and the second coil spring 22 is an insulating cylinder (fixed-side insulating cylinder). 7A or the movable-side insulating cylinder 7B) with a buffer material 13 interposed therebetween. Thereby, the concentration of the electric field at the triple point (junction) at the end of the insulating cylinder can be reduced, and the insulation reliability can be improved.

As described above, in the present embodiment, in order to reduce the electric field concentrated on the outer corner of the metal-baked portion, which is the joining portion between the insulating cylinder and the end plate, the first coil made of metal is formed so as to cover the corner. A spring 21 and a second coil spring 22 made of metal are arranged.

In the present embodiment, a part of the first coil spring 21 is formed to extend outside the cushioning material 13, and the other part is in contact with the insulating cylinder and the end plate. Then, the second coil spring 22 is in contact with the first coil spring 21 and the cushioning material 13 and is covered with the solid insulator 14.

The cushioning material 13 is formed around the end plate (outside) (particularly outside in the radial direction with respect to the axial direction) due to the thickness of the cushioning material 13 formed around (outside) the insulating cylinder. The material 13 is formed to be thicker. Further, the average coil diameter of the first coil spring 21 needs to be larger than the thickness of the cushioning material 13 formed around (outside) the end plate.

As described above, in the present embodiment, it is possible to eliminate the concern that the insulation performance is deteriorated at the triple point, which is the weak point of the insulation formed at the boundary between the end plate and the insulating cylinder, and to improve the insulation reliability.

According to the present embodiment, the electric field at the triple point, which is the weak point of the insulation of the solid insulation type vacuum switch, can be reduced, the insulation reliability can be improved, and the vacuum container and the solid insulator can be connected to each other. By forming the cushioning material 13 between them, mechanical strength can be improved.

FIG. 2 is an explanatory view showing how to attach the first coil spring of the vacuum switch of the present embodiment.

(4) How to arrange (attach) the first coil spring 21 will be described below. Although a method of arranging the first coil spring 21 on the fixed side of the vacuum vessel will be described, the first coil spring 21 can be arranged in the same manner on the movable side of the vacuum vessel. The description of the movable side is omitted.

FIG. 2 shows a state before the fixed-side insulating cylinder 7A and the fixed-side end plate 11 are covered with the cushioning material 13 and the solid insulator 14. That is, the fixed-side insulating cylinder 7A formed around the fixed electrode 2 (the movable-side insulating cylinder 7B formed around the movable electrode 3) and the fixed-side insulating cylinder 7A come into contact with the fixed-side end in the axial direction, A fixed-side end plate 11 that covers the fixed-side insulating cylinder 7A from the axial direction (a movable-side end plate 12 that contacts the axially movable end of the movable-side insulating cylinder 7B and covers the movable-side insulating cylinder 7B from the axial direction); 1 shows a state in which a vacuum container is formed from the above.

In this state, the first coil spring 21 is wound so as to contact both the end (fixed end) of the fixed-side insulating cylinder 7A and the end side surface of the fixed-side end plate 11, and the first coil The spring 21 is formed.

At this time, by making the natural length of the first coil spring 21 shorter than the outer circumferential length of the fixed-side end plate 11, a contraction force acts on the first coil spring 21 in the central axis direction of the vacuum vessel. The first coil spring 21 can be supported at two places, the end of the fixed-side insulating cylinder 7A and the end side surface of the fixed-side end plate 11, so that the first coil spring 21 does not easily move from that position.

When the first coil spring 21 is disposed in this manner, the end (metal-baked portion) of the fixed-side insulating cylinder 7A with which the first coil spring 21 comes into contact is metal because it has been metallized, and Since the fixed-side end plate 11 is also made of metal, the first coil spring 21, the end of the fixed-side insulating cylinder 7A, and the fixed-side end plate 11 are electrically connected, and all have the same potential.

Accordingly, the first coil spring 21 serves as an electric shield, and a strong electric field is not applied to the triple point formed by the fixed-side end plate 11 and the fixed-side insulating cylinder 7A.

In order to further improve the adhesiveness of the first coil spring 21, the first coil spring 21 is provided with a conductive material at a position where the first coil spring 21 contacts the end of the fixed-side insulating cylinder 7 </ b> A and the end side surface of the fixed-side end plate 11. It is good to apply an adhesive.

Further, the first coil spring 21 may be formed in a ring shape by processing both ends into a hook shape, and may be processed into a tapered shape (conical shape) at one end and inserted into the other end. To form a ring shape. In this manner, both ends of the first coil spring 21 can be bonded.

FIG. 3 is an explanatory view showing a range in which the cushioning material of the vacuum switch of the present embodiment is formed.

(4) The method of applying the cushioning material 13 will be described below. Although only the fixed side of the vacuum vessel is illustrated and described, the buffering material 13 can be applied to the movable side of the vacuum vessel in the same manner, and the description of the movable side of the vacuum vessel is omitted.

FIG. 3 shows a state in which the fixed-side insulating cylinder 7A and the fixed-side end plate 11 are covered with the cushioning material 13. That is, the buffer material 13 is formed so as to cover the outside of the fixed-side insulating tube 7A (the movable-side insulating tube 7B), the outside of the fixed-side end plate 11 (the movable-side end plate 12), and a part of the first coil spring 21.

The cushioning material 13 is arranged around the vacuum container by brushing or spraying, or by casting using a mold larger than the vacuum container. The buffer material 13 removes air contained in the buffer material 13 by vacuum degassing, thereby preventing the formation of minute voids that cause partial discharge. The range in which the cushioning material 13 covers the vacuum vessel (the fixed-side end plate 11 and the fixed-side insulating cylinder 7A) covers the entire periphery of the fixed-side end plate 11 and the fixed-side insulating cylinder 7A. However, a portion of the first coil spring 21 opposite to the portion in contact with the fixed side end plate 11 is formed so as to be exposed from the surface layer of the cushioning material 13.

That is, the first coil spring 21 is formed so as to be in contact with the fixed-side end portion of the fixed-side insulating cylinder 7A and the fixed-side end plate 11, and to be partially covered by the cushioning material 13. The cushioning member 13 is formed so as to cover a part of the first coil spring 21.

FIG. 4 is an explanatory view showing how to attach the second coil spring of the vacuum switch of the present embodiment.

(4) How to arrange (attach) the second coil spring 22 will be described below. Although a method of arranging the second coil spring 22 on the fixed side of the vacuum vessel will be described, the second coil spring 22 can be arranged in the same manner on the movable side of the vacuum vessel. The description of the movable side is omitted.

The second coil spring 22 is wound so as to contact both the first coil spring 21 exposed from the cushioning material 13 and the cushioning material 13. The winding position is a position that covers the outer circumference of the end side surface of the fixed-side insulating cylinder 7A joined to the fixed-side end plate 11.

That is, the second coil spring is formed so as to be in contact with the portion of the first coil spring 21 that is not covered by the cushioning material 13 and to face the fixed-side insulating cylinder 7A via the cushioning material 13.

At this time, by making the natural length of the second coil spring 22 shorter than the outer circumferential length of the fixed-side insulating cylinder 7A including the cushioning material 13, the second coil spring 22 is provided in the direction of the central axis of the vacuum vessel. The second coil spring 22 can be supported at two places, that is, the first coil spring 21 and the cushioning member 13, so that the second coil spring 22 does not easily move from that position.

When the second coil spring 22 is arranged in this manner, the first coil spring 21 and the second coil spring 22 are electrically connected, and the fixed side end plate 11, the first coil spring 21, and the second The coil springs 22 all have the same potential.

Accordingly, the second coil spring 22 plays a role of an electric shield, so that a strong electric field is not applied to the triple point formed by the fixed-side end plate 11 and the fixed-side insulating cylinder 7A.

In order to further improve the adhesiveness of the second coil spring 22, a conductive adhesive is preferably applied to a portion where the second coil spring 22 contacts the first coil spring 21.

The second coil spring 22 may be formed in a ring shape by processing both ends into a hook shape, and may be processed into a tapered shape (conical shape) at one end and inserted into the other end. To form a ring shape. In this manner, both ends of the second coil spring 22 can be bonded.

(5) Then, the vacuum container around which the second coil spring 22 is wound is housed in a mold, and the solid insulator 14 such as epoxy resin is poured between the vacuum container and the mold. The air inside the solid insulator 14 is evacuated by vacuum defoaming, and after heat curing, the mold is removed, and the vacuum switch 1 is completed.

That is, the solid insulator 14 is formed so as to cover the cushioning material 13, the first coil spring 21, and the second coil spring 22.

Thus, the second coil spring 22 is covered with the solid insulator 14 such as epoxy resin.

2, 3, and 4 illustrate the manufacturing method on the fixed side of the vacuum vessel, but the manufacturing method on the movable side is the same as the manufacturing method on the fixed side.

That is, after the vacuum vessel is formed, the first coil spring 21 is formed so as to be in contact with the movable-side end of the movable-side insulating cylinder 7B and the movable-side end plate 12, and the fixed-side insulating cylinder 7A and the movable-side insulating cylinder 7B are formed. The cushioning material 13 is formed so as to cover the outside of the cylinder 7B, the fixed-side end plate 11, the movable-side end plate 12, and a part of the first coil spring 21, and is covered with the cushioning material 13 of the first coil spring 21. The second coil spring 22 is formed so as to be in contact with the portion that does not exist and to face the movable-side insulating cylinder 7B via the cushioning material 13, and covers the cushioning material 13, the first coil spring 21, and the second coil spring 22. Thus, the solid insulator 14 is formed.

FIG. 5 is an explanatory diagram showing the equipotential line distribution of the vacuum switch of the present embodiment.

三 The electric field relaxation effect of the triple point by the first coil spring 21 and the second coil spring 22 will be described. FIG. 5 is an embodiment of the electric field analysis of the vacuum switch 1, showing a center axis and a right half for convenience of explanation. In this embodiment, the electrodes are in an open state, a voltage is applied to the fixed-side electrode 2, and the movable-side electrode 3 is set to the ground potential.

The fixed side of the vacuum vessel in which the first coil spring 21 and the second coil spring 22 are arranged will be described. However, the same applies to the movable side of the vacuum vessel. Is omitted.

{Here, the myriad lines shown in FIG. 5 indicate equipotential lines. Since a voltage is applied to the fixed-side electrode 2, the fixed-side end plate 11, the first coil spring 21, and the second coil spring 22 that are electrically connected to the fixed-side electrode 2 all have the same potential. .

ため Since the strength of the electric field can be known from the intervals between the equipotential lines, it can be seen that, for example, a plurality of equipotential lines are distributed at small intervals near the corner of the fixed electrode 2. In such a case, it can be understood that a strong electric field is applied near the corner of the fixed electrode 2.

Focusing on the triple point, which is the junction between the fixed-side end plate 11 and the fixed-side insulating cylinder 7A, the equipotential lines are shifted from the triple point by the arrangement of the first coil spring 21 and the second coil spring 22. Since it is located far away, no strong electric field is applied to the triple point, and the possibility of dielectric breakdown can be greatly reduced.

As described above, in the vacuum switch 1 described in the present embodiment, the portion where the fixed-side end plate 11, the buffer member 13, and the fixed-side insulating cylinder 7A are gathered has a high dielectric strength due to the solid insulator 14 and a heat of the buffer member 13. High mechanical strength due to the stress relaxing effect and electric field relaxing effect at the triple point due to the electric shielding effect by the two coil springs can be obtained.

The present invention is not limited to the embodiments described above, but includes various modifications. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described above.

DESCRIPTION OF SYMBOLS 1 ... Vacuum switch, 2 ... Fixed electrode, 3 ... Movable electrode, 4 ... Arc shield, 5 ... Bellows, 6 ... Bellows shield, 7A ... Fixed-side insulating cylinder, 7B ... Movable-side insulating cylinder, 8 ... Fixed-side electrode rod , 9 ... movable electrode rod, 10 ... guide, 11 ... fixed end plate, 12 ... movable end plate, 13 ... cushioning material, 14 ... solid insulator, 21 ... first coil spring, 22 ... second Coil spring

Claims

A fixed electrode, a movable electrode facing the fixed electrode, an insulating cylinder formed around the fixed electrode and the movable electrode, and an axial end of the insulating cylinder are in contact with each other, and the insulating cylinder is moved from the axial direction. An end plate to cover, a cushioning material covering the outside of the insulating cylinder and the end plate, and a solid insulator covering the outside of the cushioning material,
A first coil spring that is in contact with an end of the insulating cylinder and the end plate, a part of which is covered with the cushioning material, and a portion of the first coil spring that is not covered with the cushioning material; A second coil spring formed so as to face the insulating cylinder via the cushioning material;
A vacuum switch characterized by having:
A fixed electrode, a movable electrode facing the fixed electrode, a fixed-side insulating cylinder formed around the fixed electrode, a movable-side insulating cylinder formed around the movable electrode, and a fixed-side insulating cylinder. A fixed-side end plate that is in contact with the fixed-side end in the axial direction and covers the fixed-side insulating cylinder from the axial direction, and is in contact with the axially-movable-side end of the movable-side insulating cylinder in the axial direction; A movable-side end plate covering from above, the fixed-side insulating cylinder, the movable-side insulating cylinder, the fixed-side end plate, and a cushioning material covering the outside of the movable-side end plate; and a solid insulator covering the outside of the cushioning material. And having
A first coil spring that is in contact with the fixed-side end of the fixed-side insulating cylinder and the fixed-side end plate and is partially covered by the cushioning material; and covered by the cushioning material of the first coil spring. A second coil spring formed in contact with an untouched portion and opposed to the fixed-side insulating cylinder via the cushioning material;
A vacuum switch characterized by having:
A first coil spring which is in contact with the movable side end portion of the movable side insulating cylinder and the movable side end plate, and a part of which is covered by the buffer material; and a first coil spring which is covered by the buffer material of the first coil spring. 3. The vacuum switch according to claim 2, further comprising a second coil spring that is in contact with a portion that is not covered, and that is formed so as to face the movable-side insulating cylinder and the buffer material. .
A metal-baked portion is provided on a joint surface of the fixed-side insulating cylinder that is in contact with the fixed-side end plate at an axial fixed-side end portion, and the first coil spring is in contact with the metal-baked portion of the fixed-side insulating cylinder. The vacuum switch according to claim 2, characterized in that:
A metal-baked portion is provided on a joint surface of the movable-side insulating cylinder that is in contact with the movable-side end plate at an axially movable-side end portion, and the first coil spring contacts the metal-baked portion of the movable-side insulating cylinder. The vacuum switch according to claim 3, wherein:
A fixed-side insulating cylinder formed around a fixed electrode, a movable-side insulating cylinder formed around a movable electrode, and an axially-fixed end portion of the fixed-side insulating cylinder in contact with the fixed-side insulating cylinder. A vacuum vessel is formed from a fixed end plate that covers from the axial direction and a movable end plate that contacts the movable end of the movable insulating cylinder in the axial direction and covers the movable insulating cylinder from the axial direction,
Forming a first coil spring so as to be in contact with the fixed side end portion of the fixed side insulating cylinder and the fixed side end plate;
Forming a cushioning material so as to cover the fixed-side insulating cylinder, the movable-side insulating cylinder, the fixed-side end plate, the outside of the movable-side end plate and a part of the first coil spring;
A second coil spring is formed so as to be in contact with a portion of the first coil spring that is not covered with the cushioning material and to face the fixed-side insulating cylinder via the cushioning material;
A method for manufacturing a vacuum switch, wherein a solid insulator is formed so as to cover the cushioning material, the first coil spring, and the second coil spring.
Forming a first coil spring so as to be in contact with the movable-side end portion of the movable-side insulating cylinder and the movable-side end plate;
Forming a cushioning material so as to cover the fixed-side insulating cylinder, the movable-side insulating cylinder, the fixed-side end plate, the outside of the movable-side end plate and a part of the first coil spring;
A second coil spring is formed so as to be in contact with a portion of the first coil spring that is not covered by the cushioning material, and to face the movable-side insulating cylinder via the cushioning material;
The method according to claim 6, wherein a solid insulator is formed so as to cover the cushioning material, the first coil spring, and the second coil spring.