JPH09298023A - Vacuum switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a vacuum switch with a simple structure by providing an elastic conductor for electrically connecting a movable electrode to a movable electrode side external circuit terminal and pressing the movable electrode to a fixed electrode side. SOLUTION: A split terminal 6 is fitted to the shaft part 3a of a movable electrode 3 inserted through the hole 5a of a flat external circuit terminal 5 for movable electrode, and the electrode 3 is integrally connected to an operation bar 10 through an insulating rod 8. The top parts and rear end parts of a plurality of flat bar-like leaf springs 200 which are conductive elastic bodies arranged on the periphery of the hole 5a are bent in the opposite direction to the middle part at an obtuse angle. The rear end parts are fixed to the periphery of the holes 5a, and the top parts are radially arranged in the central axial direction and brought into contact with the reverse side of the split terminal 6 to energize the split terminal 6 upward. When the operation bar 10 is pushed up to bring the electrode 3 into contact with a fixed electrode 2, a prescribed contact pressure is added between both the electrodes by the leaf springs 200. As the elastic conductor, a one formed of a highly conductive member and a highly elastic member which are mutually superposed may be used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum switch which is constructed so that an electrode of a vacuum switch tube interrupts and turns on an electric current.

[0002]

2. Description of the Related Art Since a fixed electrode and a movable electrode of a vacuum switch tube are arranged in a butting structure, a repulsive force is generated between the electrodes by an electromagnetic force when a large current flows. The vacuum switch has a structure in which an appropriate contact pressure is applied between the electrodes in order to maintain the contact between both electrodes against the above force.

FIG. 6 is a side view showing a closed state of a conventional vacuum switch. In FIG. 6, 1 is a vacuum switch tube, 2
Is a fixed electrode of the vacuum switch tube 1, 3 is the vacuum switch tube 1
Of the movable electrode, 4 is a fixed electrode side external circuit terminal electrically connected to the fixed electrode 2, and 5 is a movable electrode side electrically connected to the movable electrode 3 via a split terminal and a flexible conductor described later. The external circuit terminals, and these external circuit terminals 4 and 5 are fixed to the frame of a vacuum switch (not shown) via an insulator.

Reference numeral 6 is a split terminal fixed to the shaft of the movable electrode 3, and reference numeral 7 is a flexible conductor for flexibly connecting the split terminal 6 and the movable electrode side external circuit terminal 5. The movable electrode side external circuit terminal 5 is connected to the movable electrode 3 via the split terminal 6 and the flexible conductor 7.
Is electrically connected to Reference numeral 8 denotes an insulating rod that mechanically supports the movable electrode 3 and electrically insulates the movable electrode 3 from the operating rod 10. Reference numeral 9 is provided between the insulating rod 8 and the operating rod 10 to move the movable electrode 3 This is a contact pressure spring device for urging the fixed electrode 2 side to give a predetermined contact pressure to the fixed electrode 2 and the movable electrode 3.

The contact pressure spring device 9 is constructed so that a piston 100 integrally connected to the insulating rod 8 in a cylinder 101 slides up and down. An annular stopper 102 is formed at one end of the cylinder 101 to regulate the operating range of the piston 100. A spring 103 for applying a predetermined contact pressure to the fixed electrode 2 and the movable electrode 3 is mounted in the cylinder 101 and pushes the piston 100 upward in FIG. The other end of the operating rod 10 connected to the contact pressure spring device 9 is connected to an operating mechanism (not shown), and the contact pressure spring device 9 is moved up and down according to the operation of the operating mechanism to move the movable electrode 3
Is connected to / separated from the fixed electrode 2 to open / close the switch.

Next, the operation will be described. In the closed state of the switch shown in FIG. 6, the electric current is fixed electrode side external circuit terminal 4
~ Flow through the passage of fixed electrode of vacuum switch tube 2-movable electrode of vacuum switch tube 3-split terminal 6-flexible conductor 7-external circuit terminal 5 for movable electrode.

In this closed state, the operating rod 10 and the contact pressure spring device 9 are pushed up by an operating mechanism (not shown),
The spring 103 is compressed by the distance W, and the piston 1
00 and the movable electrode 3 integrally connected thereto are pressed against the fixed electrode 2. As a result, a predetermined contact pressure is applied between the movable electrode 3 and the fixed electrode 2.

When the switch is opened, the operating rod 10 and the contact pressure spring device 9 are pulled down by the operating mechanism (not shown) from the state shown in FIG. 6, and the piston 100 and the movable electrode 3 integrally connected thereto are pulled. When the movable electrode 3 is pulled downward, the movable electrode 3 is separated from the fixed electrode 2 and the contact is opened.

[0009]

Since the conventional vacuum switch is constructed as described above, when an attempt is made to increase the breaking capacity, the repulsion between the fixed electrode 2 and the movable electrode 3 is accompanied by an increase in the making current. Since the force becomes large, the contact pressure between the fixed electrode 2 and the movable electrode 3 must also be increased. Therefore, the contact pressure spring device 9 had to be upsized. As a result, there is a problem that the entire device becomes large and the number of parts increases.

The present invention has been made to solve the above problems, and an object thereof is to provide a vacuum switch which has a simple structure and can be miniaturized.

[0011]

According to a first aspect of the present invention, there is provided a vacuum switch having a fixed electrode and a movable electrode, and a fixed electrode side external circuit terminal for electrically connecting the fixed electrode to an external circuit. A movable electrode side external circuit terminal for connecting the movable electrode to an external circuit is mechanically connected and electrically insulated from the movable electrode and the operating mechanism to connect / separate the movable electrode of the operating mechanism to / from the fixed electrode. An insulating rod that transmits to the movable electrode, and an elastic conductor that electrically connects the movable electrode and the movable electrode side external circuit terminal and presses the movable electrode toward the fixed electrode side are provided.

In the vacuum switch of the second aspect, the elastic conductor is composed of a plurality of leaf springs.

According to another aspect of the vacuum switch of the present invention, at least one elastic conductor is used by stacking the elastic conductors as needed.
It is composed of one disc spring.

In the vacuum switch according to the fourth aspect, the elastic conductor is made by stacking a highly conductive member and a highly elastic member.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. FIG. 1 is a side view with a part in section showing the closed state of the vacuum switch of the present invention. FIG. 2 is II of FIG.
FIG. 7 is a cross-sectional view taken along the line II. The same or corresponding parts as those of the conventional vacuum switch shown in FIG. 6 are designated by the same reference numerals, and the description thereof will be omitted. 1 and 2, the movable electrode external circuit terminal 5 is a plate-shaped member having a hole 5a, and the movable electrode 3 is arranged in the hole 5a with the shaft portion 3a penetrating therethrough. In the shaft portion 3a of the movable electrode 3, as in the conventional case,
The split terminal 6 is fitted. The movable electrode external circuit terminal 5 is fixed to a frame of a vacuum switch (not shown) via an insulator. The movable electrode 3 is integrally connected to the operating rod 10 via an insulating rod 8.

A plurality of flat bar-shaped leaf springs 200, which are elastic conductors, are arranged around the periphery of the hole 5a of the movable electrode external circuit terminal 5. The leaf spring 200 has a front end portion and a rear end portion that are bent at an obtuse angle in opposite directions with respect to the intermediate portion. The leaf springs 200 each have a rear end portion fixed to the peripheral edge of the hole 5a and are radially arranged with their front end portions directed toward the central axis direction of the movable electrode 3. Each leaf spring 200 has its tip end abutted against the back surface of the split terminal 6, and has its rear end fixed while being bent so as to bias the split terminal 6 upward in FIG. The leaf spring 200 is made of, for example, phosphorous rust copper having conductivity and elasticity.

In the closed state of the switch shown in FIG. 1, the current is a fixed electrode external circuit terminal 4, a fixed electrode of the vacuum switch tube 2, a movable electrode 3 of the vacuum switch tube 3, a split terminal 6 and a leaf spring 200. ~ Flow by the passage of the external circuit terminal 5 for movable electrodes.

Next, the operation will be described. In the closed state of the switch shown in FIG. 1, the operating rod 10 and the insulating rod 8 are pushed upward by the operating mechanism (not shown), and the movable electrode 3 is in contact with the fixed electrode. In this state, the leaf spring 200 biases the rear surface of the split terminal 6 upward in FIG. Therefore, the movable electrode 3 is pressed toward the fixed electrode 2 and a predetermined contact pressure is applied between the movable electrode 3 and the fixed electrode 2.

On the contrary, when the switch is opened, the operating rod 10 is pulled down from the state shown in FIG. 1 by an operating mechanism (not shown), and the insulating rod 8 connected integrally with the operating rod 10.
The movable electrode 3 is pulled down and opens. This time,
Since the leaf spring 200 is further bent than when it is closed, its restoring force increases, but like the vacuum switch of the present embodiment,
In a vacuum switch whose opening distance is several mm, there is no problem because the fluctuation of the restoring force of the leaf spring 200 is not so large.

In the vacuum switch having such a structure,
Since the contact pressure spring device can be eliminated, the structure can be simplified and the number of parts can be reduced, and the assemblability and reliability of the device can be improved. Further, the device can be downsized, and the cost can be further reduced.

Embodiment 2 FIG. FIG. 3 is a view of an elastic conductor showing another example of the vacuum switch of the present invention. In the first embodiment, the elastic conductor is the plurality of flat plate rod-shaped leaf springs 200 radially arranged at the periphery of the hole 5a of the movable electrode external circuit terminal 5, but the disc spring 300 shown in FIG. But it is okay. The disc spring 300 has a disc shape without a bottom, and slits 300a are radially formed to obtain appropriate elasticity. The disc spring 300 is made of, for example, phosphorous rust copper, like the leaf spring 200 of the first embodiment.

In the present embodiment, in the configuration of the first embodiment, instead of the plurality of leaf springs 200, a disc spring 300 which is an elastic conductor is arranged in the movable electrode external circuit terminal 5. The disc spring 300 is arranged with its periphery fixed so as to close the hole 5a of the movable electrode external circuit terminal 5 in the direction in which the dish is turned down, and the shaft portion 3a of the movable electrode 3 is penetrated through the central hole. The peripheral edge is in contact with the back surface of the split terminal 6. A plurality of disc springs 300 are stacked and used as needed. Other configurations and operations are similar to those of the first embodiment.

In the vacuum switch having such a structure,
It is easy to make the contact pressure between the movable electrode 3 and the fixed electrode 2 appropriate by stacking a plurality of disc springs 300 as needed. Further, a large contact pressure can be easily obtained without increasing the size of the device.

Embodiment 3. FIG. 4 is a front view of a main part showing another example of the vacuum switch of the present invention. FIG. 5 is a side view. In the first embodiment, the flat conductor 200 made of phosphorous rust copper is used as the elastic conductor, but in the present embodiment, the elasticity made by stacking two materials is used. A flat plate bar-shaped leaf spring 400 that is a conductor is used. As shown in FIG. 4, the leaf spring 400 is made by stacking two materials, a leaf spring material 400a that is a highly elastic member and a thin conductor 400b that is a highly conductive member. Then, in the leaf spring 400, similarly to the first embodiment, the front end portion and the rear end portion are respectively different from the intermediate portion,
It is bent with an obtuse angle in the opposite direction.

Similar to the first embodiment, the leaf springs 400 are arranged in a radial pattern with their tips directed toward the central axis of the movable electrode 3. The rear end portion is fixed to the back surface of the peripheral edge of the hole 5a so that the thin conductor 400b is connected to the movable electrode external circuit terminal 5. And each leaf spring 400 is
Similar to the first embodiment, each tip portion is brought into contact with the back surface of the split terminal 6, and the split terminal 6 is bent so as to be biased upward in FIG. Has been fixed. Other configurations and operations are similar to those of the first embodiment.

In the vacuum switch having such a structure,
The leaf spring 400 is a leaf spring material 400 that is a highly elastic member.
a and a thin conductor 400b, which is a highly conductive member, are made by stacking two materials, so that a large energization current and a large contact pressure can be obtained without increasing the size of the device. You can

[0027]

In the vacuum switch according to the first aspect of the present invention, the vacuum switch tube having the fixed electrode and the movable electrode, the fixed electrode side external circuit terminal for electrically connecting the fixed electrode to the external circuit, and the movable electrode to the outside. A movable electrode side external circuit terminal for connecting to a circuit is mechanically connected and electrically insulated from the movable electrode and the operating mechanism, and an operation of connecting / disconnecting the movable electrode of the operating mechanism to / from the fixed electrode is transmitted to the movable electrode. Since the insulating rod and the elastic conductor for electrically connecting the movable electrode and the movable electrode side external circuit terminal and pressing the movable electrode to the fixed electrode side are provided, the contact pressure spring device can be eliminated, The structure can be simplified and the number of parts can be reduced. And the assembling property and reliability of the device are improved. Also,
The device can be downsized, and the cost can be further reduced.

In the vacuum switch according to the second aspect of the invention, since the elastic conductor is composed of a plurality of leaf springs, the structure can be made simple.

In the vacuum switch according to a third aspect of the present invention, at least one elastic conductor is used by stacking it as needed.
Since it is composed of one disc spring, the disc springs can be used by stacking a plurality of disc springs as needed, and it is easy to make the contact pressure between the movable electrode and the fixed electrode appropriate. . Also, a large contact pressure can be easily obtained.

In the vacuum switch of the fourth aspect, since the elastic conductor is made by stacking a highly conductive member and a highly elastic member, a large energizing current and a large contact pressure can be obtained.

[Brief description of drawings]

FIG. 1 is a side view, partly in section, showing a closed state of a vacuum switch according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a view of an elastic conductor showing another example of the vacuum switch of the present invention.

FIG. 4 is a front view of a main part showing another example of the vacuum switch according to the present invention.

FIG. 5 is a side view of essential parts showing another example of the vacuum switch of the present invention.

FIG. 6 is a side view showing a closed state of a conventional vacuum switch.

[Explanation of symbols]

1 vacuum switch tube, 2 fixed electrode, 3 movable electrode, 4
Fixed electrode side external circuit terminal, 5 movable electrode side external circuit terminal, 8 insulating rod, 200 leaf spring (elastic conductor), 3
00 disc spring (elastic conductor), 400 leaf spring (elastic conductor), 400a leaf spring material (highly elastic member), 400b
Thin conductor (highly conductive material).

Claims (4)

[Claims] 1. A vacuum switch tube having a fixed electrode and a movable electrode, a fixed electrode side external circuit terminal for electrically connecting the fixed electrode to an external circuit, and a movable electrode side for connecting the movable electrode to an external circuit. An insulating rod that mechanically connects and electrically insulates the external circuit terminal, the movable electrode and the operating mechanism, and transmits to the movable electrode an operation of connecting / separating the movable electrode of the operating mechanism to / from the fixed electrode. And a resilient switch that electrically connects the movable electrode and the movable electrode side external circuit terminal and presses the movable electrode toward the fixed electrode side. 2. The vacuum switch according to claim 1, wherein the elastic conductor is composed of a plurality of leaf springs. 3. The vacuum switch according to claim 1, wherein the elastic conductor is composed of at least one disc spring which is stacked and used as necessary. 4. The vacuum switch according to claim 1, wherein the elastic conductor is made by stacking a highly conductive member and a highly elastic member.