JPH11345547A - Switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a switching device to miniaturize it easily and minimize constraint on its installation by receiving all moving components such as a first supporting member to support a moving contact, which abuts on and separates from a fixed contact. SOLUTION: A rod-like moving conductor 6 as a first supporting member is entirely located in a vacuum container 1 and supports a moving contact 6a with its upper end, and when the moving conductor 6 moves upward, the moving contact 6a abuts on a fixed contact 5b to bring a switching device into a closed state. In this case, a main circuit switching part of the switching device is formed from the moving contact 6a and the fixed contact 5b, and when the moving conductor 6 is positioned at the upper limit of the movable region, a current is carried through a path composed of an upper fixed electrode 5a, a fixed conductor 5, time fixed contact 5b, the moving contact 6a, the moving conductor 6, a flexible conductor 8 and a lower fixed electrode 15. Then, not only the main circuit switching part but also all moving components such as a driving part of a closing(opening) repulsion coil 13a(13b) are received in the vacuum container 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing device having a main circuit opening / closing section in a vacuum vessel maintained at a high vacuum and opening / closing a circuit between a power supply and a load device.

[0002]

2. Description of the Related Art A vacuum switchgear (hereinafter referred to as a switchgear) for opening and closing a circuit between a power supply and a load device has a main circuit switchgear inside a vacuum vessel maintained at a high vacuum. Utilizing a high dielectric strength in a vacuum and an excellent arc-extinguishing ability, the current can be cut off stably.

FIG. 5 is a vertical sectional view showing a conventional switchgear. In FIG. 5, reference numeral 1 denotes a vacuum vessel, and the vacuum vessel 1 is a hermetic seal formed by a cylindrical ceramic insulating tube 2 constituting a side portion, an upper metal plate 3 constituting an upper portion, and a lower metal plate 4 constituting a lower portion. The inside of the container is kept at a high vacuum.

[0004] A disk-shaped upper fixed electrode 5 a is fitted in the center of the upper metal plate 3. The lower surface of the upper fixed electrode 5 a is inside the vacuum vessel 1, and the upper surface is outside the vacuum vessel 1. It is exposed to. An upper end of a rod-shaped fixed conductor 5 is fixed to a lower surface of the upper fixed electrode 5a, and a disc-shaped fixed contact 5b is supported at a lower end of the fixed conductor 5. The fixed conductor 5 and the fixed contact 5b are fixed inside the vacuum vessel 1.

[0005] The vacuum vessel 1 passes through the center of the lower metal plate 4.
The rod-shaped movable conductor 6 penetrating inside and outside of the bellows is supported so as to be movable up and down via a bellows 7 having a bellows shape which is attached and retracted inside the vacuum vessel 1 so as to be movable.
Expands and contracts as the movable conductor 6 moves up and down, so that the airtightness of the vacuum vessel 1 is maintained.

The upper portion of the movable conductor 6 is inside the vacuum vessel 1, and supports the movable contact 6a at the upper end. When the movable conductor 6 moves upward, the movable contact 6a becomes the fixed contact 5b. And the switching device is closed. In this way, the movable contact 6a and the fixed contact 5b inside the vacuum vessel 1 form a main circuit opening / closing portion of the opening / closing device. The lower portion of the movable conductor 6 is outside the vacuum vessel 1, and the other end of the flexible conductor 8 having one end fixed to the lower end is connected to an external load device (not shown). In addition, the movable conductor 6
A movable rod 10 for moving the movable conductor 6 up and down is connected to a lower end of the movable conductor 6 via an insulating rod 9 for insulating the movable conductor 6 from a lower mechanism.

The movable rod 10 is entirely outside the vacuum vessel 1, and a flat annular repulsion plate 11 whose upper and lower surfaces are magnetic poles is circumferentially mounted at an intermediate portion thereof.
0a is recessed. A disc spring 14 is fitted in the groove 10a, and a peripheral edge of the disc spring 14 is fitted to a lower portion of a cylindrical frame 12 provided so as to surround the periphery of the movable rod 10. Further, the disc spring 14 is inverted with the vertical movement of the movable rod 10 and supports the movable rod 10 at the upper limit or the lower limit in the movable range of the movable rod 10.

The frame 12 is about the same height as the movable rod 10 and has a closing repulsion coil 1 near its inner middle.
3a, when the movable rod 10 is at the lower limit of the movable range, the lower surface of the repulsion plate 11 is close to the upper surface of the closing repulsion coil 13a, and the closing repulsion coil 13a is connected to the closing repulsion coil 13a. By applying a pulse current so that the upper surface has the same magnetic pole as the lower surface of the repulsion plate 11, an electromagnetic repulsive force that moves the repulsion plate 11 upward is generated. An open-circuit repulsion coil 13b is provided inside the upper part of the frame 12, and when the movable rod 10 is at the upper limit of the movable range, the upper surface of the repulsion plate 11 is close to the lower surface of the open-circuit repulsion coil 13b. By applying a pulse current to the opening repulsion coil 13b such that the lower surface of the opening repulsion coil 13b has the same magnetic pole as the upper surface of the repulsion plate 11, an electromagnetic repulsion force for moving the repulsion plate 11 downward is generated.

In FIG. 5, the main circuit opening / closing section is in an open state,
The movable rod 10 is at the lower limit of the movable range. When the main circuit switch is in a closed state, the movable rod 10 is at the upper limit of the movable range, and the upper fixed electrode 5a, the fixed conductor 5, the fixed contact 5
b, the movable contact 6 a, the movable conductor 6, and the current flow through the flexible conductor 8.

As described above, in the conventional opening / closing device, the main circuit opening / closing section is housed inside the vacuum vessel 1, and the driving sections such as the movable rod 10, the closing repulsion coil 13a, and the opening repulsion coil 13b are connected to the vacuum vessel 1. This is the configuration that has been brought out of the system.

[0011]

In the conventional switchgear, since the bellows 7 is stressed every time the movable conductor 6 moves, the bellows 7 is easily damaged. If the bellows 7 is damaged, the bellows 7 loses hermeticity. There are reliability issues. In addition, since there are many types and numbers of constituent parts, there is a problem that the structure is complicated and the size is easily increased. In addition, moving parts such as the movable conductor 6 are exposed to the outside of the vacuum vessel 1 so that they are liable to break down. Further, when an opening and closing device is installed, a moving margin for the moving parts is secured, and insulation accompanying the movement is ensured. Since it is necessary to dispose the driving unit in consideration of various conditions such as a change in the situation, there is a problem that there are many restrictions on the installation.
In particular, when a plurality of switchgears are required, the size of the switchgears is very large, so that the problem of installation becomes very large.

[0012] The present invention has been made in view of such circumstances, and by housing all moving parts such as movable conductors in a vacuum vessel, airtightness is hardly lost, and durability and reliability are excellent. It is a main object of the present invention to provide a switchgear that reduces the types and number of constituent parts, has a simple structure, can be easily miniaturized, and has less restrictions on installation.

Further, by providing a conductive member to a supporting member such as a disc spring for supporting the movable conductor, the type and number of constituent parts can be reduced, the structure is simple, and an opening / closing device that can be easily miniaturized is provided. For other purposes.

Further, by using a movable contact having a magnetic pole, the type and number of constituent parts can be reduced.
Another object of the present invention is to provide a switchgear having a simple structure and which can be easily miniaturized.

Furthermore, by sharing a fixed electrode exposed outside the vacuum vessel and providing a plurality of fixed contacts and movable contacts, even when power is distributed to a plurality of load devices, it is small and the restriction on installation is small. Another object is to provide a small opening and closing device.

[0016]

According to a first aspect of the present invention, there is provided an opening / closing device comprising: a fixed contact; a movable contact that comes into contact with / separates from the fixed contact; a first support member that supports the movable contact; A vacuum vessel accommodating the movable contact and the first support member as a whole.

According to a second aspect of the present invention, there is provided an opening / closing device according to the first aspect, comprising: a first support member having conductivity; and a second support member having conductivity, which movably supports the first support member. It is characterized by the following.

According to a third aspect of the present invention, there is provided a switchgear according to the first or second aspect, further comprising a movable contact having a magnetic pole.

According to a fourth aspect of the present invention, there is provided an opening / closing device according to any one of the first to third aspects, further comprising a plurality of fixed contacts and movable contacts.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the switchgear has a disk-like fixed contact and a disk-like shape, and one surface of the fixed contact comes into contact with / separates from one surface. A movable contact that moves linearly; a first conductive member that is linear and moves linearly while supporting the other surface of the movable contact at one end; a fixed contact and a movable contact And the first
A cylindrical vacuum container accommodating the whole of the support member.

In the switchgear according to the first and fifth aspects of the present invention, all the moving parts such as the movable contact that comes into contact with / separate from the fixed contact and the movable conductor that is the first support member that supports the movable contact are provided. Store in a vacuum vessel. This makes it difficult for airtightness to be lost, so that durability and reliability are improved. Further, the types and the number of constituent parts are small, the structure is simple, and miniaturization is easy. Further, since the moving drive unit is located inside the vacuum vessel, restrictions on installation can be reduced.

In the switchgear according to the second aspect of the present invention, the support member such as a disc spring for supporting the movable conductor is provided with conductivity. This makes it possible to use the supporting member as a conductor, so that a flexible conductor is not required. For this reason, the types and the number of constituent components are small, the structure is simple, and miniaturization is easy.

In the switchgear according to the third aspect of the present invention, the movable contact has a function of a repulsion plate in the electromagnetic repulsion mechanism by using the movable contact having a magnetic pole, so that two parts can be used as the repulsion plate. The opening and closing operation can be performed by one repulsion coil. For this reason, the types and the number of constituent components are small, the structure is simple, and miniaturization is easy.

In the switchgear according to the fourth aspect, the fixed electrode exposed outside the vacuum vessel is shared, a plurality of fixed contacts and movable contacts are provided to reduce the size, and distribute power to a plurality of load devices. Even in this case, there are fewer restrictions on installation.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments. FIG. 1 is a sectional elevational view showing a switchgear according to a first embodiment of the present invention. In the figure, reference numeral 1 denotes a vacuum vessel, and the vacuum vessel 1 has a sealed cylindrical shape formed by a cylindrical ceramic insulating tube 2 on the side, an upper metal plate 3 on an upper portion, and a lower metal plate 4 constituting a lower portion. It is a container, and the inside is kept in a high vacuum.

A disk-shaped upper fixed electrode 5a is fitted into the center of the upper metal plate 3, and the lower surface of the upper fixed electrode 5a is inside the vacuum vessel 1 and the upper surface is outside the vacuum vessel 1. It is exposed to. An upper end of a rod-shaped fixed conductor 5 is fixed to a lower surface of the upper fixed electrode 5a, and a disc-shaped fixed contact 5b is supported at a lower end of the fixed conductor 5. The fixed conductor 5 and the fixed contact 5b are fixed inside the vacuum vessel 1.

The lower fixed electrode 15 fixed to the center of the lower metal plate 4 has a shape in which the surfaces of two disks having different sizes are bonded to each other. The electrode which is exposed to the outside and the smaller disk is inside the vacuum vessel 1 and one end of the flexible conductor 8 is fixed. The other end of the flexible conductor 8 is fixed to the lower end of a rod-shaped movable conductor 6 that is a first support member that moves up and down.

The movable conductor 6 is entirely inside the vacuum vessel 1 and supports a movable contact 6a at the upper end thereof. When the movable conductor 6 moves upward, the movable contact 6a is fixed to the fixed contact 5b. And the switching device is closed. As described above, the main contact switch of the switchgear is formed by the movable contact 6a and the fixed contact 5b. Near the middle portion of the movable conductor 6, a flat annular repulsion plate 1 whose upper and lower surfaces are magnetic poles
A disc spring 14 as a second support member is fitted in a groove 10a recessed around the upper part of the movable conductor 6, and the peripheral edge of the disc spring 14 is Is fitted inside the cylindrical ceramic insulating tube 2 on the side of the ceramic insulating tube 2. Further, the disc spring 14 is inverted with the vertical movement of the movable conductor 6, and supports the movable conductor 6 at the upper limit or the lower limit in the movable range of the movable conductor 6.

A closing repulsion coil 13a is provided below the inside of the vacuum vessel 1, and when the movable conductor 6 is at the lower limit of the movable range, the lower surface of the repulsion plate 11 is closed.
The repulsion plate 11 is moved upward by applying a pulse current to the closing repulsion coil 13a so that the upper surface of the closing repulsion coil 13a has the same magnetic pole as the lower surface of the repulsion plate 11. Electromagnetic repulsion occurs. An open circuit repulsion coil 13b is provided in the center of the inside of the vacuum vessel 1, and when the movable conductor 6 is at the upper limit of the movable range, the upper surface of the repulsion plate 11 is close to the lower surface of the open circuit repulsive coil 13b. The opening repulsion coil 13b is connected to the opening repulsion coil 13b.
By applying a pulse current so that the lower surface of b has the same magnetic pole as the upper surface of the repulsion plate 11, an electromagnetic repulsive force that moves the repulsion plate 11 upward is generated.

In FIG. 1, the main circuit opening / closing section is in an open state,
The movable conductor 6 is at the lower limit of the movable range. When the main circuit switch is in a closed state, the movable conductor 6 is at the upper limit of the movable range, and the upper fixed electrode 5a, the fixed conductor 5, the fixed contact 5b, the movable contact 6a, the movable conductor 6, the flexible conductor 8, Then, a current flows through the path of the lower fixed electrode 15.

As described above, the switchgear according to the present invention includes not only the main circuit switchgear but also the movable conductor 6 and the repulsion coil 1 for closing.
The drive unit such as 3a and the open-circuit repulsion coil 13b are also housed inside the vacuum vessel 1, so that there is no component that moves from the outside of the vacuum vessel 1.

Embodiment 2 FIG. FIG. 2 is a sectional elevational view showing a switchgear according to a second embodiment of the present invention. Embodiment 2
In the first embodiment, a groove 10a is recessed around the lower end of the movable conductor 6 which is the first support member in the first embodiment, and the disc spring 14 which is the second support member having conductivity is fitted. Then, the flexible conductor 8 is eliminated by fitting the peripheral portion of the disc spring 14 inside the upper end of the lower fixed electrode 15 forming the lower and lower portions of the vacuum vessel 1. Note that members corresponding to those in Embodiment 1 are given the same reference numerals, and descriptions thereof are omitted.

In the second embodiment, when the main circuit switch is closed, the upper fixed electrode 5a, the fixed conductor 5, the fixed contact 5b, the movable contact 6a, the movable conductor 6, the disc spring 1
4, and a current flows through the path of the lower fixed electrode 15.

Embodiment 3 FIG. 3 is an elevational sectional view showing a switchgear according to a third embodiment of the present invention. Embodiment 3
Has a configuration in which a repulsion coil 13 having both functions of a closing repulsion coil and an opening repulsion coil according to the second embodiment is provided near the middle inside the vacuum vessel 1, and the lower surface of the movable contact 6a is a magnetic pole. is there. Note that members corresponding to those in Embodiment 2 are given the same reference numerals, and descriptions thereof are omitted.

In FIG. 3, the main circuit opening / closing section is in an open state,
The movable conductor 6 is at the lower limit of the movable range. As described above, when the movable conductor 6 is at the lower limit of the movable range, the lower surface of the movable contact 6a is close to the upper surface of the repulsion coil 13 and the repulsion coil 13
By applying a pulse current so that the upper surface of the repulsion coil 13 has the same magnetic pole as the lower surface of the movable contact 6a, an electromagnetic repulsive force for moving the movable contact 6a upward is generated.
When the movable conductor 6 is in the closed state in which the movable range is at the upper limit of the movable range, the upper surface of the repulsion plate 11 is close to the lower surface of the repulsion coil 13, and the lower surface of the repulsion coil 13 is in contact with the upper surface of the repulsion plate 11. By supplying a pulse current so as to have the same magnetic pole, an electromagnetic repulsive force for moving the repulsion plate 11 downward is generated.

Embodiment 4 FIG. FIG. 4 is an elevational sectional view showing a switchgear according to a fourth embodiment of the present invention. Embodiment 4
Is a configuration in which a shared electrode 16 shared by a plurality of switchgears is formed by using a rectangular plate having conductivity instead of the fixed electrode exposed to the outside in the second embodiment. Three switchgears are connected to each of the 16 sides. Note that members corresponding to those in Embodiment 2 are given the same reference numerals, and descriptions thereof are omitted.

In the fourth embodiment, an example is shown in which six switchgears are connected to both sides of a rectangular plate, but the number of switchgears to be connected and the connection configuration are not limited to such a configuration. The configuration is not particularly limited as long as the configuration has a common electrode and a plurality of main open / close sections.

Embodiment 5 The fifth embodiment has a configuration in which the repulsion plate 11 in the first embodiment is formed of a conductive material. In the fifth embodiment, when the main circuit opening / closing section is in an open circuit state and the movable conductor 6 is at the lower limit of the movable range, an eddy current is generated in the repulsion plate 11 by applying a pulse current to the closing repulsion coil 13a. Then, a magnetic field in a direction opposite to the magnetic field generated in the closing repulsion coil 13a is generated. As a result, an electromagnetic repulsive force for moving the movable conductor 6 upward is generated. When the movable conductor 6 is in the closed state where the movable range is at the upper limit of the movable range, an eddy current is generated in the repulsion plate 11 by applying a pulse current to the open-circuit repulsion coil 13b,
A magnetic field is generated in a direction opposite to the magnetic field generated in the opening repulsion coil 13b. This generates an electromagnetic repulsion that moves the movable conductor downward. The same applies to the case where the repulsion plate 11 in Embodiments 2 to 4 is formed of a conductive material.

Embodiment 6 FIG. In the sixth embodiment, the repulsion plate 11 according to the first embodiment is used as an attraction plate, and the closing repulsion coil 13a and the opening repulsion coil 13b are used as an attraction coil for opening and an attraction coil for closing, respectively. In the sixth embodiment, when the main circuit opening / closing section is in the open state and the movable conductor 6 is at the lower limit of the movable range, the pulse current is supplied so that the lower surface of the attraction coil for closing is a magnetic pole different from the upper surface of the attraction plate. This generates an electromagnetic attraction force that moves the attraction plate upward. Further, when the movable conductor 6 is in the closed state where the movable range is at the upper limit of the movable range, the suction plate is moved downward by applying a pulse current so that the upper surface of the open-circuit suction coil has a different magnetic pole from the lower surface of the suction plate. Electromagnetic attraction occurs. In the second to fourth embodiments, the main circuit can be opened and closed by the electromagnetic attraction force.

[0040]

As described above in detail, in the switchgear according to the first and fifth aspects of the present invention, all the moving parts such as the movable conductor supporting the movable contact which comes into contact with / separates from the fixed contact are provided inside the vacuum vessel. Housed in This eliminates the bellows that maintain the airtightness of the vacuum vessel by expanding and contracting, making it difficult for airtightness to be lost, excellent in durability and reliability, reducing the number and types of constituent parts, and having a simple, easy and compact structure. Since the moving drive unit is not exposed to the outside, there are excellent effects such as less restrictions on installation.

In the switchgear according to the second aspect of the present invention, the support member such as a disc spring for supporting the movable conductor is provided with conductivity. As a result, since the disc spring can be used as a conductor, a flexible conductor for electrically connecting the movable contact and the external electrode is not required, and the types and number of constituent parts are reduced, and the structure is simple and easy. It has excellent effects such as being able to be downsized.

In the switchgear according to the third invention, a movable contact having a magnetic pole is used. As a result, the movable contact has the function of a repulsion plate in the electromagnetic repulsion mechanism, and the number of components that can be used as the repulsion plate becomes two. Therefore, the opening and closing operation can be performed with one repulsion coil. It has excellent effects such as reduction, simple structure and easy downsizing.

In the switching device according to the fourth invention, a plurality of switching devices sharing a fixed electrode are provided. As a result, even in the case where power is distributed to a plurality of load devices, an excellent effect is obtained, such as less restrictions on installation.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a switchgear of the present invention.

FIG. 2 is a vertical sectional view showing the switchgear of the present invention.

FIG. 3 is a vertical sectional view showing the switchgear of the present invention.

FIG. 4 is a vertical sectional view showing the switchgear of the present invention.

FIG. 5 is a vertical sectional view showing a conventional switchgear.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Vacuum container, 2 ceramic insulating tubes, 3 upper metal plates, 4 lower metal plates, 5 fixed conductors, 5a upper fixed electrodes, 5b fixed contacts, 6 movable conductors, 6a movable contacts, 8 flexible conductors, 10a grooves, 11 rebound plate, 13a
Closing repulsion coil, 13b Opening repulsion coil, 14
Belleville spring, 15 lower fixed electrode.

Claims (5)

[Claims] 1. A fixed contact, a movable contact that comes into contact with / separates from the fixed contact, a first support member that supports the movable contact, and the whole of the movable contact and the first support member are accommodated. An opening / closing device comprising: 2. A first supporting member having conductivity, wherein the first supporting member has
The opening / closing device according to claim 1, further comprising a second support member that supports the support member movably and has conductivity. 3. The switchgear according to claim 1, further comprising a movable contact having a magnetic pole. 4. The switchgear according to claim 1, further comprising a plurality of fixed contacts and movable contacts. 5. A disk-shaped fixed contact and a disk-shaped fixed contact,
A movable contact that linearly moves so that one surface comes into contact with / separates from one surface of the fixed contact, and a linear movement that is rod-shaped and the other surface of the movable contact is supported at one end. A conductive first support member, a fixed contact, a movable contact,
The opening / closing device according to claim 1, further comprising: a cylindrical vacuum container that houses the entire first support member.