JPH10321097A - Vacuum switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum switch, wherein stabilization of switching action points and of contact parting distance as well as reduction in the number of part items and space saving can be realized. SOLUTION: A thermal radiation fin 12 having a bottom surface and two side surfaces is attached to an end part of a fixed electrode 1, exposed to the exterior of a vacuum container 3 via a main circuit terminal 11 consisting of a substantially rectangular plate-shaped elastic body, and these are fastened by a bolt 13 from the radiation fin 12 side. Both ends of the main circuit terminal 11 being supported by support members 15, its thickness becomes gradually thicker as it approaches close to an attaching part of the fixed electrode 1, and the attaching part is made thickest. Further, the radiation fin 12 has a bottom surface of substantially same length as the main circuit terminal 11 between the support member 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vacuum switch, and more particularly, to an electrode support mechanism.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view showing a main part of a conventional vacuum switch. In the figure, reference numeral 3 denotes a vacuum container, and on the upper surface of the vacuum container 3, a fixed electrode 1 is inserted and fixed to its middle. A spring receiver 5 having a spring 7 fitted on the outer periphery thereof is coaxially connected to the fixed electrode 1 at the end of the fixed electrode 1 exposed outside the vacuum vessel 3. The other end of the spring receiver 5
The main circuit conductor 6 is inserted into the hole of the plate-shaped main circuit conductor 6 from one surface side, and is elastically fixed by attaching a stopper 8 from the other surface side of the main circuit conductor 6. A movable electrode 2 which is movable in the axial direction by a drive mechanism (not shown) is inserted to the middle of the lower surface of the vacuum vessel 3, and is attached via a bellows 4 to obtain a sealed structure. . The end of the movable electrode 2 exposed to the outside of the vacuum vessel 3 is connected to another main circuit conductor.

[0003] With such a configuration, the movable electrode 2 is slid in the axial direction with respect to the vacuum vessel 3, and the fixed electrode 1 and the movable electrode 2 open and close in the vacuum vessel 3. When the vacuum switch is closed, the movable electrode 2 is
When the fixed electrode 1 receives a force outward of the vacuum vessel 3, the other end of the spring receiver 5 tries to protrude toward the other surface of the main circuit conductor 6. The spring 7 is vibrated by a buffer mechanism utilizing the contraction force and the return force of the spring 7, and this impact force is absorbed. When the vacuum switch is opened, the return of the spring 7 is regulated by the stopper 8, and the fixed electrode 1 returns to a predetermined position.

[0004]

The support mechanism of the fixed electrode 1 in the conventional vacuum switch constructed as described above is as follows.
Due to the buffer mechanism using the contraction force and the return force of the spring 7, it takes time to absorb the vibration of the fixed electrode 1, and there is a problem in the stability of the opening and closing operation points. In addition, at the time of opening, two kinds of vibrations, that is, the vibration of the fixed electrode 1 by the spring 7 and the vibration of the movable electrode 2 after sliding occur, so that the opening distance varies slightly without being stabilized. Further, the support mechanism for the fixed electrode 1 has a large number of parts and, since the shock absorbing effect depends on the size of the spring 7, it cannot be reduced, and it is difficult to save space.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a main circuit terminal with a function of absorbing an impact force and a vibration energy, thereby stabilizing an opening / closing operation point and an opening distance, and a component. It is an object of the present invention to provide a vacuum switch capable of reducing the number of points and space.

[0006]

According to the first aspect of the present invention,
The main circuit terminal plate whose both ends are supported by the support member is characterized in that the thickness of the fixed electrode mounting portion is the largest and the end portion is tapered at the thinner end.

According to a second aspect of the present invention, in the first aspect of the present invention, a predetermined large radiation fin is attached to the other surface of the main circuit terminal plate between the support members by a fastening member. Features.

According to a third aspect of the present invention, the main circuit terminal plate whose both ends are supported by the support member has a portion that is convex on one side and concave on the other side. The fixed electrode is attached to a central portion on the side.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the heat radiation of a size sufficient to cover the concave portion formed here and the periphery thereof is provided on the other surface side of the main circuit terminal plate between the support members. The fin is attached by a fastening member.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. Embodiment 1 FIG. FIG. 1 is a cross-sectional view showing a main part of the vacuum switch according to the first embodiment. In the figure, reference numeral 3 denotes a vacuum container, and on the upper surface of the vacuum container 3, a fixed electrode 1 is inserted and fixed to its middle. A main circuit terminal made of a substantially rectangular plate-like elastic body is provided at an end of the fixed electrode 1 exposed to the outside of the vacuum vessel 3.
A radiating fin 12 having a bottom surface and two side surfaces is attached via the fin 11, and these are bolted from the radiating fin 12 side.
Signed at 13. The main circuit terminal 11 is supported at both ends by a support member 15, and its thickness gradually increases as approaching the fixed electrode 1 mounting portion, and the mounting portion is the thickest. The radiating fins 12 have bottom surfaces that are substantially the same length as the main circuit terminals 11 between the support members 15.

A movable electrode 2, which is movable in the axial direction by a drive mechanism (not shown), is inserted into the lower surface of the vacuum vessel 3 to the middle thereof, and is attached via a bellows 4 to obtain a sealed structure. Have been. The end of the movable electrode 2 exposed to the outside of the vacuum vessel 3 is connected to another main circuit conductor.

With such a configuration, the movable electrode 2 is slid in the axial direction with respect to the vacuum vessel 3, and the fixed electrode 1 and the movable electrode 2 open and close in the vacuum vessel 3. When the vacuum switch is closed, the movable electrode 2 is
The fixed electrode 1 receives a force outward of the vacuum vessel 3. At this time, since the main circuit terminal 11 is an elastic body, the impact force is absorbed and vibrated by the bending and elasticity of the main circuit terminal 11.

As shown in FIG. 2, a beam whose both ends are supported
When a concentrated load 21 is applied to the center of 22, the distribution of the bending moment becomes maximum at the center where the concentrated load is applied,
It decreases linearly as it approaches the end. Fig. 2 (b)
As shown in FIG. 5, the deflection of the beam 22 at this time becomes maximum at the central portion where the concentrated load is applied, and becomes smaller toward the end portion. In order to reduce the deflection at the load point in opposition to the bending moment of the beam 22, the sectional area of the beam 22 may be increased in accordance with the distribution of the magnitude of the bending moment. Therefore, as in the case of the main circuit terminal 11 shown in FIG. 1, the plate thickness is gradually increased as approaching the mounting portion of the fixed electrode 1 and is made thickest at the mounting portion, thereby absorbing the shock when the vacuum switch is closed. The vibration width at that time is reduced, and thereby the time required for the vibration to converge is reduced.

Further, since the radiation fins 12 are substantially the same length as the length of the main circuit terminal 11 between the support members 15, the heat radiation fins 12 come into contact with the main circuit terminal 11 in this portion, and the downward vibration of the main circuit terminal 11 is thereby caused. It is regulated and the vibration energy of the main circuit terminal 11 is absorbed. Further, since the heat radiating plate (bottom surface) of the heat radiating fins 12 is parallel to the main circuit terminals 11, the rigidity of the main circuit terminals 11 against bending in the longitudinal direction is enhanced by the aid of the heat radiating fins 12. Therefore, the vibration converges in a shorter time, and a stable switching operation point can be obtained.

Even when the vacuum switch is opened, the downward bending of the main circuit terminal 11 due to the downward movement of the fixed electrode 1 is restricted by the radiation fins 12, and the vibration energy is absorbed. Further, the rigidity of the main circuit terminal 11 against bending in the longitudinal direction is enhanced with the aid of the radiation fins 12, so that the amplitude of the vibration generated in the fixed electrode 11 when the electrode is opened is small. Therefore, the vibration converges in a short time, and a stable opening distance can be obtained.

Furthermore, since a spring is not used as a shock-absorbing mechanism as in the prior art, it is possible to reduce the number of parts involved and to save space in the vertical direction in the figure. . In addition, a radiation effect by the radiation fins 12 is obtained.

Embodiment 2 FIG. FIG. 3 is a sectional view showing a main part of the vacuum switch according to the second embodiment. In the present embodiment, the main circuit terminal 11 whose thickness shown in FIG.
Instead, a main circuit terminal 14 made of an elastic body and having a shield-shaped bulge formed with the mounting portion of the fixed electrode 1 at the apex is supported by the support member 15 with the bulge down. The length A of the bulging portion is smaller than the length B of the radiation fin 12. Other configurations are the same as those shown in FIG.
The same reference numerals are given and the description is omitted.

The impact force generated by the collision between the movable electrode 2 and the fixed electrode 1 when the vacuum switch is closed is absorbed by the bending of the main circuit terminal 14 and its elasticity. At this time, the swelling of the main circuit terminal 14 functions in the same manner as the leaf spring, so that the impact force and the vibration of the main circuit terminal 14 are absorbed. Also, the main circuit terminal 14 and the radiation fins 12 are always in contact around the bulging portion, and the bulging portion is deformed by receiving an upward force, so that the contact portion functions so as to increase. The radiation fins 12 absorb the vibration energy of the main circuit terminals 14. Further, since the heat radiation fins 12 are in contact with the space smaller than the space between the support members 15, the downward vibration of the main circuit terminal 14 is regulated, and the vibration energy is absorbed. Further, since the periphery of the bulge is in contact with the radiation fin 12, the rigidity of the main circuit terminal 14 against bending in the longitudinal direction is enhanced. Therefore, the vibration converges in a short time, and a stable switching operation point can be obtained.

When the vacuum switch is opened, the downward deflection of the main circuit terminal 14 due to the downward movement of the fixed electrode 1 is restricted by the contact with the radiation fins 12, and the vibration energy is absorbed. Further, since the rigidity is enhanced by the radiation fins 12, the amplitude of the vibration generated in the fixed electrode 1 when the electrode is opened is reduced. Therefore, the vibration converges in a short time, and a stable opening distance can be obtained.

Further, similar to the first embodiment, since no spring is used, the number of parts can be reduced and the space in the vertical direction can be reduced. In addition, a radiation effect by the radiation fins 12 is obtained.

[0021]

As described above, according to the first aspect of the present invention, the distribution of the bending moment due to the load is
The larger the bending moment is, the thicker the main circuit terminal is. Thereby, the impact force due to the collision between the fixed electrode and the movable electrode at the time of closing is reduced by the bending of the main circuit terminal and the elastic force thereof, and the vibration energy is absorbed. Therefore, the vibration converges in a short time because the amplitude during vibration is small. Also, the vibration energy is absorbed even when the electrode is opened, so that the amplitude is small and converges in a short time. As a result, a stable opening / closing operation point and a stable opening distance can be obtained. In addition, since no spring is used, the number of components can be reduced and the space in the vertical direction can be reduced.

According to the second aspect of the present invention, a first aspect is provided.
In addition to the effects of the described invention, the movement of the main circuit terminal to the movable electrode side in the vibration after the collision at the time of closing the electrode is regulated by the radiation fin. In addition, the movement of the main circuit terminal toward the movable electrode side due to the separation of both electrodes and this movement due to subsequent vibration are restricted. Therefore, the amplitude of the vibration becomes smaller. Further, since the rigidity of the main circuit terminal against bending is enhanced by the radiation fin, the amplitude can be reduced.

According to the third aspect of the present invention, since the bulging portion having a convex surface on one side acts like a leaf spring, the impact force caused by the collision between the fixed electrode and the movable electrode at the time of closing the electrode is reduced by the main circuit. It is alleviated by the bending of the terminal and its elastic force, and its vibration energy is absorbed. Therefore, the vibration converges in a short time because the amplitude during vibration is small. Also, the vibration energy is absorbed even when the electrode is opened, so that the amplitude is small and converges in a short time. As a result, a stable opening / closing operation point and a stable opening distance can be obtained. In addition, since no spring is used, the number of components can be reduced and the space in the vertical direction can be reduced.

According to the fourth aspect of the present invention, there is provided the third aspect.
In addition to the effects of the described invention, the movement of the main circuit terminal to the movable electrode side in the vibration after the collision at the time of closing the electrode is regulated by the radiation fin. In addition, the movement of the main circuit terminal toward the movable electrode side due to the separation of both electrodes and this movement due to subsequent vibration are restricted. Therefore, the amplitude of the vibration becomes smaller. Further, the present invention has an excellent effect, for example, the amplitude can be reduced because the radiating fins enhance the rigidity of the main circuit terminal against bending.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a vacuum switch according to a first embodiment.

FIG. 2 is a diagram illustrating a bending moment.

FIG. 3 is a schematic sectional view showing a vacuum switch according to a second embodiment.

FIG. 4 is a schematic sectional view showing a conventional vacuum switch.

[Explanation of symbols]

1 fixed electrode, 2 movable electrode, 3 vacuum vessel, 11, 14
Main circuit terminals, 12 heat radiation fins, 13 bolts (fastening members), 15 support members.

Claims (4)

[Claims] 1. A fixed electrode, a movable electrode, a vacuum container in which these are opened and closed, and an elastic body, and the fixed electrode is attached to one surface side of the fixed electrode. A main circuit terminal plate having a thickest tapered end portion, a support member for supporting both ends of the main circuit terminal plate, and a fastening member for fastening the fixed electrode and the main circuit terminal plate. Vacuum switch. 2. The vacuum switch according to claim 1, wherein a heat radiation fin having a predetermined size is attached to the other surface of the main circuit terminal plate between the support members by a fastening member. 3. A fixed electrode, a movable electrode, a vacuum container in which these are opened and closed, and an elastic body having a portion that is convex on one side and concave on the other side. A main circuit terminal plate to which the fixed electrode is attached at a central portion on one surface side; a support member supporting both ends of the main circuit terminal plate; and a fastening for fastening the fixed electrode and the main circuit terminal plate. Vacuum switch comprising a member. 4. A radiating fin having a size to cover the concave portion formed therearound and the periphery thereof is attached to the other surface side of the main circuit terminal plate between the support members by a fastening member. The vacuum switch according to claim 3, wherein