JPH05114338A - Vacuum valve - Google Patents

Abstract

PURPOSE:To simplify constitution as well as to make current higher in amperage by eliminating a coil section acting as a means for generating longitudinal magnetic fields, and also securing the cross sectional area of a wire for live current. CONSTITUTION:A circular recessed section 10a which is extended close to a contact 1, is provided for the center of a stationary side conductor 10 onto the tip end of which the contact 1 is fixed, a permanent magnet (N pole) 21 is inserted into the circular recessed section 10a so as to be fitted thereon, and a circular recessed section 17a which is extended close to a contact 2, is provided for the center of a movable side conductor 17 at the tip end of which the movable contact 2 is fixed, so that a permanent magnet (S pole) 23 is inserted into the circular recessed section 17a so as to be fitted thereon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum valve used in a vacuum circuit breaker for blocking a large current, and more particularly to a vertical magnetic field type vacuum valve configured to apply a magnetic field in the same direction as the current.

[0002]

2. Description of the Related Art Conventionally, in a vertical magnetic field type vacuum valve, in order to generate a magnetic field in the same direction as an electric current at a contact portion arranged in a vacuum container, a conductor portion of a path leading to a fixed electrode and a movable electrode is coiled. What was formed in the above was generally used.

This coiled portion, that is,
Various types of coil parts have been proposed, such as an internal coil type to be placed inside the vacuum vessel and an external coil type to be placed outside the vacuum vessel. Considering the ease of handling a magnetic field and a vacuum valve. Most of those that have been put into practical use are internal coil types.

FIG. 4 shows an example of the structure of an internal coil type coil portion. As shown in the figure, the fixed side coil portion 3 and the movable side coil portion 4 are arranged on the backs of the fixed contact 1 and the movable contact 2, respectively, which generate an arc at the time of interruption, and the main current is routed through the fixed side conductor 5 → Fixed side coil part 3 → Fixed contact 1 → Moving contact 2
→ Movable coil portion 4 → Movable conductor 6, and a magnetic field in the same direction as the current, that is, a vertical magnetic field is generated in the contact gap portion. As a result, the current of the magnetic field is restricted and the breaking current is improved.

[0005]

However, in the method of providing the coil portion as described above, the main current path is formed in a coil shape, which inevitably complicates the configuration and reduces the cross-sectional area for the current flow. Is subject to thermal restrictions. For this reason, when increasing the current of a vertical magnetic field type vacuum valve having a coil part, the external size is increased, which increases the external size of the vacuum circuit breaker, which increases the installation space and makes handling difficult. It was a drawback such as increasing

The present invention has been made in view of the above-mentioned circumstances, and eliminates a coil portion as a means for generating a longitudinal magnetic field, simplifies the configuration, and secures a cross-sectional area of a current-carrying current to increase a large current. In order to provide a vacuum valve that does not have to be made large in size even when it is intended to solve the drawbacks such as an increase in the installation space and the difficulty of handling due to the size increase of the vacuum circuit breaker. There is.

[0007]

According to the present invention, a pair of a first contact and a second contact, which come into contact with and separate from each other in a vacuum container, are mounted on a fixed side conductor and a movable side conductor, respectively. In the vacuum valve, a recess extending to the vicinity of the first contact is formed in the center of the fixed-side conductor, a permanent magnet is attached to this recess, and a recess extending to the vicinity of the second contact is formed in the center of the movable-side conductor. A permanent magnet having a pole different from that of the permanent magnet is mounted in the recess.

Further, according to the present invention, in a vacuum valve having a fixed-side conductor and a movable-side conductor, each of which has a pair of a first contact and a second contact which are brought into contact with and separated from each other in a vacuum container, and which are fixed to respective tips. A concave portion extending to the vicinity of the first contact is formed at the center of the side conductor, a permanent magnet having a circular hollow portion is attached to the concave portion, and a concave portion extending to the vicinity of the second contact is formed at the center of the movable conductor. , Having a circular hollow portion in this recess,
Moreover, the above-mentioned permanent magnet has a permanent magnet of a different pole attached thereto.

[0009]

A concave portion extending to the vicinity of the first contact is formed at the center of the fixed-side conductor, and a concave portion extending to the vicinity of the second contact is formed at the center of the movable-side conductor. Is mounted to generate a longitudinal magnetic field between the first contact and the second contact, the configuration is simplified as compared with the conventional coil part mounted, and a continuous current flow of The cross-sectional area is secured, and a large current can be achieved without making the outer shape large. Further, by forming the circular hollow portion in the permanent magnet, the maximum value of the magnetic field strength can be expanded in the circumferential direction to further increase the current.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the structure of an embodiment of the present invention. In the figure, 10 is a fixed-side conductor, which is airtightly joined to one opening portion of the porcelain bushings 12 and 13 which are integrally joined via a joined body 11 via a fixed plate 14, and the fixed contact 1 on the tip surface.
Is stuck. An end plate 16 is airtightly joined via a fixing plate 15 to the other opening of the porcelain bushings 12 and 13 that are integrally joined. A movable-side conductor 17 is airtightly joined to the end plate 16 via a bellows 18 so as to be movable in the axial direction, and the fixed contact 2 is fixed to the tip surface. The fixed-side conductor 10, the fixed plate 14, the porcelain insulators 12, 13, the joining plate 11, the end plate 16, the movable-side conductor 17 and the bellows 18 form a vacuum container 19 capable of holding a high vacuum, and are joined in the vacuum container 19. A cylindrical shield 20 is attached via a plate 11.

Further, the fixed-side conductor 10 is provided with a circular concave portion 10a extending to the vicinity of the fixed portion of the fixed contact 1 at the center thereof, and a permanent magnet (N pole) 21 is inserted into the circular concave portion 10a to be attached. A cover plate 22 is attached to the opening side. Also,
The movable conductor 17 described above is provided with a circular concave portion 17a extending to the vicinity of the fixed portion of the movable contact 2 at the center.
The permanent magnet (S pole) 23 is inserted and attached to a, and the contactor 24 is attached to the inner peripheral surface of the opening so that the outer conductor (not shown) and the movable conductor 17 can contact each other while moving in the axial direction. ..

Therefore, the permanent magnets 21 and 23 are arranged so that their opposite poles face each other, and the fixed contact 1 and the movable contact 2 are arranged.
A longitudinal magnetic field can be formed in the gap between and. That is, with this configuration, a longitudinal magnetic field can be obtained by mounting the permanent magnets 21 and 23 inside the fixed-side conductor 10 and the movable-side conductor 17 in terms of outer shape. In addition, a thin interference film is provided on the surfaces of the permanent magnets 21 and 23 so that the permanent magnets 21,
I try to protect 23. On the other hand, the above-mentioned permanent magnet
Circular hollow portions 21a and 23a are formed in the centers of 21 and 23, respectively.

Next, the operation of the embodiment configured as described above will be described. A permanent magnet is placed in the circular recess 10a of the fixed-side conductor 10.
By mounting 21a and mounting a permanent magnet 23 having a pole different from that of the permanent magnet 21 in the recess 17a of the movable conductor 17, the permanent magnets 21 and 23 having a pole different from each other are arranged so as to face each other. A longitudinal magnetic field can be formed in the contact gap with the movable contact 2. Therefore, since the coil portion as in the conventional case is not provided, the configuration is simplified, the cross-sectional area of the energization current can be secured, and the large current can be achieved without increasing the outer shape.

As shown in FIG. 2, the maximum value of the magnetic field strength distribution of the vertical magnetic field exists when the circular hollow portions 21a and 23a are not provided in the permanent magnets 21 and 23, respectively. However, the permanent magnets 21, 23 have circular hollows 21a,
When 23a is provided, the maximum value of the magnetic field strength spreads in the circumferential direction as shown in FIG. 3, arc concentration at the time of interruption is less likely to occur at the contact points, and more favorable interruption performance can be obtained. The present invention is not limited to the above-described embodiment, and the corner portions of the permanent magnets 21 and 23 may be curved to further flatten the magnetic field distribution with respect to FIG.

[0015]

As described above, according to the present invention, a fixed-side conductor having a pair of contact points that are in contact with and separated from each other fixed to the tip thereof, and a concave portion extending to the vicinity of the contact point are formed at the center of the movable-side conductor. Since the permanent magnets with different polarities are mounted in each recess, the coil part for forming the vertical magnetic field as in the past is not required and the configuration is simplified, and the cross-sectional area of the energizing current is secured and the outer shape is large. A large current can be achieved without shaping, and the breaking performance can be further improved by providing the permanent magnet with a circular hollow portion.

[Brief description of drawings]

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

FIG. 2 is an explanatory view of the operation of the embodiment of the present invention.

FIG. 3 is an explanatory view of the operation of the embodiment of the present invention different from that of FIG.

FIG. 4 is a cross-sectional view of a conventional vertical magnetic field type vacuum valve.

[Explanation of symbols]

1 ... Fixed contact, 2 ... Movable contact, 10 ... Fixed side conductor, 10a,
17a ... Circular recess, 17 ... Movable conductor, 19 ... Vacuum container, 21,
23 ... Permanent magnets, 21a, 23a ... Circular hollow part.

Claims (2)

[Claims] 1. A vacuum valve comprising a fixed-side conductor and a movable-side conductor, each of which has a pair of first contact and second contact that come into contact with and separate from each other in a vacuum container, and which are fixed to respective tips. A recess extending to the vicinity of the first contact is formed in the center of the recess, a permanent magnet is attached to the recess, and a recess extending to the vicinity of the second contact is formed at the center of the movable-side conductor. A vacuum valve in which a permanent magnet having a pole different from that of the permanent magnet is mounted. 2. A vacuum valve in which a fixed-side conductor and a movable-side conductor having a pair of a first contact and a second contact, which come into contact with and separate from each other in a vacuum container, are attached to respective tips, and the fixed-side conductor is provided. A recess extending to the vicinity of the first contact is formed at the center of the core, a permanent magnet having a circular hollow portion is attached to the recess, and a recess extending to the vicinity of the second contact is formed at the center of the movable conductor. Then, a vacuum valve having a circular hollow portion in this concave portion and a permanent magnet having a different pole from the permanent magnet is mounted.