JP2002008498A - Breaker device and electromagnetic actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a breaker device of improved reliability in regard to frequent opening and closing. SOLUTION: This breaker device comprises, operating means 10 which opens and closes breakers 31, 32 and 33 through movable shafts 41, 42 and 43 by moving operating shaft 111, a connector 9 which connects the shaft 111 with the shafts 41, 42 and 43 to make the shaft 111 and the shafts 41, 42 and 43 move parallel in same direction each other when the operating means 10 is working, and driving means 11 which gives the driving force to the shafts 41, 42 and 43 in such direction that the breakers 31, 32 and 33 are going to close.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutoff device for opening and closing a vacuum valve with an operating rod, for example, and an electromagnetic actuator used for the shutoff device.

[0002]

2. Description of the Related Art FIG. 7 is a side view showing the structure of a conventional vacuum shut-off device for opening and closing a small-capacity vacuum valve. As shown in FIG. 7, a vacuum valve 73 is supported on a support 72 on a switchboard 71 mounted on a cart, and an operating rod 7 for operating a movable contact of the vacuum valve 73 is provided.
4 is connected to an operation mechanism provided below the switchboard 71 via an insulating operation rod 75.

This operating mechanism has an electromagnetic actuator 76 composed of a permanent magnet, a solenoid coil, and the like.
The lever 8 is moved upward near the electromagnetic actuator 76.
A link mechanism composed of two or the like is provided. The lever 82 is
It is attached so as to be rotatable around a rotation shaft 77, one end of which is connected to the insulating operation rod 75 via a connection portion 78 and a connection spring 79, and the other end is provided via a connection portion 81. And is connected to a shut-off spring 80 fixed on the carriage. Further, a movable iron piece 83 that is pulled down by excitation of the electromagnetic actuator 76 is attached to the lever 82.

FIG. 8 is a perspective sectional view showing the structure of the electromagnetic actuator 76. As shown in FIG. The yoke 101 has a laminated structure of electromagnetic steel sheets, and is formed in a ring shape having a rectangular shape as a whole. That is, the yoke 101 is configured by laminating a plurality of electromagnetic steel plates having a rectangular hollow flat plate shape. An operation rod 102 is provided at a central portion inside the yoke 101.
Is mounted. The movable iron piece 83 is mounted on the upper end of the armature 103.

A plate-shaped permanent magnet 104 is provided around the armature 103. More armature 1
An annular solenoid coil 105a, 105b is provided above and below the permanent magnet 104 around the periphery of the solenoid. A gap 106 is formed between the armature 103 and the yoke 101.

In the vacuum shut-off device having such a configuration, the solenoid coil 105 of the electromagnetic actuator 76 is used.
b, the permanent magnet 104 and the solenoid coil 1
The armature 103 is attracted downward by the magnetic flux generated by 05b. As a result, the movable iron piece 83 is pulled down together with the operation rod 102, and the lever 82 is
7 is rotated counterclockwise in the figure. This allows
When the operating rod 74 is driven upward via the insulating operating rod 75, the contact point of the vacuum valve 73 is turned on, and the vacuum interrupting device is turned on.

When the solenoid coil 105a of the electromagnetic actuator 76 is excited, the armature 103 is attracted upward by the magnetic flux generated by the solenoid coil 105a, and the lever 82 is turned around the rotation shaft 77, as shown in FIG. When the operation rod 74 is rotated in the direction and the operation rod 74 is driven downward via the insulating operation rod 75, the contact point of the vacuum valve 73 is opened, and the vacuum cutoff device is cut off.

[0008]

In the conventional vacuum interrupter having the above-described structure, the vacuum valve serving as a circuit breaker is opened and closed via a link mechanism including a lever and the like. For this reason, there is a problem that a large impact force is generated by frequent opening and closing operations via the link mechanism, and each component including the vacuum valve and the operation mechanism is damaged. As described above, the conventional vacuum interrupter lacks reliability for frequent opening and closing.

Further, in the conventional electromagnetic actuator having the above-described structure, since the permanent magnet is exposed to the outside, the leakage of the magnetic flux occurs, the load characteristic of the armature deteriorates, and the electromagnetic actuator is disposed in the vicinity. There is a problem of magnetically affecting parts. In addition, the conventional electromagnetic actuator uses an annular yoke or the like, and thus has a problem of increasing the size.

[0010] It is an object of the present invention to provide a circuit breaker that improves the reliability of frequent opening and closing of a circuit breaker.

It is another object of the present invention to provide an electromagnetic actuator which prevents leakage of magnetic flux to the outside and which is reduced in size.

[0012]

Means for Solving the Problems In order to solve the above problems and achieve the object, the shut-off device and the electromagnetic actuator of the present invention are configured as follows.

(1) An interrupting device according to the present invention comprises an operating means for opening and closing a circuit breaker through a movable shaft by movably operating an operating shaft; Connecting means for connecting the operating shaft and the movable shaft so that the movable direction of the movable shaft is the same linear direction; and urging means for urging the movable shaft in a direction in which the circuit breaker is closed. And is composed of

According to the breaking device of the present invention, both the movable shaft for moving the circuit breaker and the operating shaft of the operating means perform a linear motion in the same direction without using a conventional link mechanism comprising a lever or the like. A large impact force is not generated due to the frequent opening and closing operations of the circuit breaker, the breakage of the circuit breaker and each mechanism is reduced, and the reliability is improved.

(2) The electromagnetic actuator of the present invention has a cylindrical shape, a yoke for forming a magnetic path, an armature provided in the yoke and provided to be movable with a predetermined axis, and the yoke. A magnet that is provided within and emits a magnetic force for moving the armature;
A coil that is provided in the yoke and generates a magnetic flux that increases or decreases the magnetic force.

According to the electromagnetic actuator of the present invention, by arranging the permanent magnet and the solenoid coil in the yoke, the leakage of magnetic flux to the outside can be reduced, and the load characteristics can be improved. In addition, since leakage of magnetic flux can be prevented without a shield, an electromagnetic actuator excellent in environmental protection can be provided. Further, by making the yoke into a cylindrical shape, manufacture becomes easy.

(3) An electromagnetic actuator according to the present invention is the electromagnetic actuator according to the above (2), wherein the magnet is provided inside the coil.

According to the electromagnetic actuator of the present invention, the leakage of the magnetic flux generated by the magnet to the outside can be further reduced.

(4) An electromagnetic actuator according to the present invention is the electromagnetic actuator according to the above (2) or (3), and has a two-step gap between the armature and the inner wall of the yoke. ing.

According to the electromagnetic actuator of the present invention, it is possible to prevent the armature from directly applying an impact force to the magnet during the closing operation, and to reduce the impact force.

[0021]

FIG. 1 is a front view showing the structure of a vacuum shut-off device for opening and closing a small-capacity vacuum valve according to an embodiment of the present invention.

As shown in FIG. 1, three sets of support members 21, 22, which are juxtaposed on a switchboard 1 mounted on a truck.
The vacuum valves 23, 32, and 33 are supported by 23 so as to correspond to three-phase currents. The operating rods (movable shafts) 41, 42, 43 for operating the movable contacts of these three vacuum valves 31, 32, 33 are respectively insulated by the support members 5 provided in the central part of the switchboard 1. Rods 61, 62, 63 and electromagnetic repulsion coils 71, 7
2, 73 and the upper part of the connection bar 9 via wipe springs 81, 82, 83.

These vacuum valve 31, operating rod 41,
A set of an insulating operation rod 61, an electromagnetic repulsion coil 71, a wipe spring 81, and a connection bar 9, a set of a vacuum valve 32, an operation rod 42, an insulation operation rod 62, an electromagnetic repulsion coil 72, a wipe spring 82, and a connection bar 9, Vacuum valve 33,
Each set of the operation rod 43, the insulating operation rod 63, the electromagnetic repulsion coil 73, the wipe spring 83, and the connection bar 9 is linearly arranged so as to be able to move vertically in the vertical direction. Note that the wipe springs 81, 82, 83
Vacuum valves 32, 3 having contacts for interrupting actual current
A load is applied to the contacts 2 and 33. The connecting bar 9 is formed of a plate member having a U-shaped cross section.

An operation mechanism 10 is provided below the switchboard 1, and an operation rod (operation shaft) 1 of the operation mechanism 10 is provided.
The upper end of 11 is connected to the lower center of the connecting bar 9. Open springs 11, 11 are arranged near both sides of the operating mechanism 10, respectively, and the upper ends of the open springs 11, 11 are attached to the lower part of the connecting bar 9, and the lower ends are provided on the floor of the switchboard. Hooks 12, 12. Note that the two open-circuit springs 11, 11 are coil springs, each of which is equidistant from the operation rod 111 and is attached to the connecting bar 9 so as to apply an equal tensile force.

This vacuum cut-off device has an operation mechanism 10
And the distance B from the connecting bar 9 to the electromagnetic repulsion coils 71, 72, 73 are substantially the same.

FIG. 2 is a perspective sectional view showing the structure of the electromagnetic actuator 10 ′ constituting the operating mechanism 10.

The yoke 112 forming the magnetic path is formed of a cylindrical steel pipe having a stopper plate 113 at the bottom, and a hollow part 200 through which the operating rod 111 is vertically movably inserted is provided at the center axis a of the cylinder. Is formed.
This hollow part 200 has three hollow parts 201, 202, 20.
3 and each of the hollow sections 201, 202, and 203 has a circular cross section. Thereby, in the yoke 112,
The first flat wall 301 is formed by the step between the first-stage hollow portion 201 and the second-stage hollow portion 202, and the second-stage hollow portion 2 is formed.
A second flat wall 302 is formed by a step between the second hollow portion 203 and the third hollow portion 203.

The first-stage hollow portion 201 is formed in the upper half of the yoke 112, and only the operation rod 111 is inserted therethrough.
The second-stage hollow portion 202 is formed in the lower half of the yoke 112, and the third-stage hollow portion 203 is formed below the yoke 112, and the armature 114 is inserted therein so as to be vertically movable. . The diameter of the hollow portion 200 is the first-stage hollow portion 201, the second-stage hollow portion 202, and the third-stage hollow portion 203.
In the order of.

The armature 114 has a cylindrical shape and its outer diameter is large at the bottom, so that the armature 114 has a shape having a protrusion 1141 on the peripheral surface of the bottom. The protrusion 1141 protrudes into the third-stage hollow portion 203. An operation rod 111 is inserted into the central axis a of the armature 114, and the operation rod 111 always protrudes from the upper and lower surfaces of the yoke 112.

Since the height of the armature 114 is lower than the combined height of the second-stage hollow portion 202 and the third-stage hollow portion 203, the upper surface of the armature 114 and the yoke 1
12 has a predetermined gap 115 in the vertical direction with respect to the first flat wall 301. In addition, the protrusion 1141 of the armature 114 and the second
Has a predetermined gap 116 in the vertical direction. Gap 115 and Gap 11
6 have the same length interval.

The operating rod 111 in the yoke 112
Around the first stage hollow portion 201 and the second stage hollow portion 2
An annular hollow portion 204 is formed to surround the vicinity of 02. An annular solenoid coil 117 is provided in the hollow portion 204. Inside the ring formed by the solenoid coil 117, a hollow disk-shaped permanent magnet 118 is provided around the operation rod 11.

FIG. 3 is a diagram showing a closed state of the electromagnetic actuator 10 '. 3, the same parts as those in FIG. 2 are denoted by the same reference numerals. As shown in FIG. 3, when the electromagnetic actuator 10 'is in a closed state, the permanent magnet 118
And the magnetic force generated by the excitation of the solenoid coil 117 overcomes the compressive force of the open-circuit springs 11,
The operating rod 111 is pushed upward. in this case,
The armature 114 has a first flat wall 301
And the protrusion 1141 is pressed against the second plane wall 302.
Has been pressed against.

The gaps 115 and 116 are provided between the lower surface of the armature 114 and the stopper plate 113.
A gap 120 having the same length as that of FIG. In the closing operation, the shape of the suction surface of the armature 114 to be sucked to the first flat wall 301 and the shape of the second flat wall 302
The shapes of the suction surfaces of the protrusions 1141 that are sucked into the shape are hollow circles.

FIG. 4 is a view showing an open state of the electromagnetic actuator 10 '. 4, the same parts as those in FIG. 2 are denoted by the same reference numerals. As shown in FIG. 4, when the electromagnetic actuator 10 'is in the open state, the open spring 11,
When the connecting bar 9 is pulled downward by the compression force of 11, the operation rod 111 is pushed down. In this case, the lower surface of the armature 114 is pressed against the stopper plate 113, and the armature 114
A gap 115 is formed between the upper surface of the armature 114 and the first plane wall 301, and a gap 116 is formed between the protrusion 1141 of the armature 114 and the second plane wall 302.

FIGS. 5A to 5C are diagrams showing the principle of the closing operation of the electromagnetic actuator 10 '. In the open state shown in FIG. 4, the permanent magnet 1 as shown in FIG.
When a magnetic flux in the same direction as the magnetic flux of the permanent magnet 118 is generated by the excitation of the solenoid coil 117 as shown in FIG. 5B together with the magnetic flux by the armature 114, as shown in FIG. Suctioned at 118.
Thereby, the operation rod 1 together with the armature 114 is
11 is pushed upward, and the closed state shown in FIG. 3 is obtained.

With the operation of the operation rod 111, FIG.
Is pushed upward while maintaining the horizontal state, and the operating rods 41, 42, 43 are wiped by the wipe springs 81, 82, 83, the electromagnetic repulsion coils 71, 72, 7
3. Directly drive upward through the insulating operation rods 61, 62, 63. Thereby, each vacuum valve 31, 32, 3
3 is input.

FIGS. 6A to 6C are diagrams showing the principle of the opening operation of the electromagnetic actuator 10 '. In the closed state shown in FIG. 3, the permanent magnet 1 shown in FIG.
When a magnetic flux in the opposite direction to the magnetic flux of the permanent magnet 118 is generated by the excitation of the solenoid coil 117 as shown in FIG. 6B together with the magnetic flux generated by the permanent magnet 118 as shown in FIG. Flux and solenoid coil 11
The magnetic fluxes of 7 cancel each other. Thereby, the permanent magnet 118
Attraction force (magnetic force) between the armature 114 and the armature is attenuated,
When the connecting bar 9 is pulled downward by the compressive force of the open-circuit springs 11, 11, the operation rod 111 is pushed downward, and the closed state shown in FIG. 4 is established.

With the operation of the operation rod 111, the connecting bar 9 is pushed down while keeping the horizontal state,
Each of the operating rods 41, 42, 43 has a wipe spring 81, 8
2, 83, the electromagnetic repulsion coils 71, 72, 73, and the insulated operation rods 61, 62, 63 to drive linearly downward.
Thereby, each vacuum valve 31, 32, 33 is shut off.

According to the vacuum interrupting device of the present embodiment, the operating rod 111 of the operating mechanism 10 is configured to move in the same direction as the moving direction of the vacuum valves 31, 32, 33. The movable contacts 32 and 33 are
Insulating rods 61, 62, 63, 81
It is linearly connected to the connecting bar 9 via 82 and 83.
When the operating rod 111 of the operating mechanism 10 performs a linear motion in the vertical direction, the movable contacts of the vacuum valves 31, 32, and 33 move in the same direction as the movable direction of the operating rod 111.

With such a configuration, since there is no intervening link mechanism such as a conventional lever mechanism, a large impact force is not generated due to the frequent opening and closing operations of the vacuum valves 31, 32, 33, and the vacuum valve 31, 32, 33
And breakage of each mechanism is reduced.

Further, according to the electromagnetic actuator 10 'of the present embodiment, the yoke 112 constituting the magnetic path is formed in a cylindrical shape, the permanent magnet 118 is provided so as to be enclosed in the yoke 112, and the permanent magnet 118 is provided with the solenoid. Coil 1
By arranging the magnets 17 inside, the leakage of the magnetic flux generated by the permanent magnet 118 and the solenoid coil 117 to the outside can be reduced.

Further, the armature 114 and the yoke 11
By making the gap between the two inner walls a two-stage structure,
It is possible to prevent the armature 114 from directly applying an impact force to the permanent magnet 118 during the closing operation, and reduce the impact force. In addition, since the gap has a two-stage structure, the suction surface where the yoke 112 is attracted to the armature 114 becomes two-stage and becomes large, so that the armature 11
4. The diameter of the yoke 112 and the solenoid coil 117 can be reduced, and the entire electromagnetic actuator 10 'can be reduced in size.

It should be noted that the present invention is not limited to the above-described embodiment, but can be implemented with appropriate modifications without departing from the scope of the invention. For example, in the above-described embodiment, the opening spring 11 is attached to the lower portion of the connecting bar 9 and the operation rod 111 is pushed downward. However, the attachment position of the opening spring is not limited to this, and the opening spring is attached to the bottom of the operation rod 111 or the like. You may. Further, the shape of the yoke 112 is not limited to a cylindrical shape, but may be any shape having a curvature such as a flat cross section. Further, the yoke 112 and the armature 114 may have a laminated structure.

[0044]

According to the present invention, it is possible to provide a circuit breaker which improves the reliability of frequently opening and closing circuit breakers.

Further, according to the present invention, it is possible to provide an electromagnetic actuator capable of preventing leakage of magnetic flux to the outside and achieving downsizing.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration of a vacuum interrupting device according to an embodiment of the present invention.

FIG. 2 is a perspective sectional view showing a configuration of an electromagnetic actuator according to the embodiment of the present invention.

FIG. 3 is a diagram showing a closed state of the electromagnetic actuator according to the embodiment of the present invention.

FIG. 4 is a diagram showing an open state of the electromagnetic actuator according to the embodiment of the present invention.

FIG. 5 is a view showing the principle of a closing operation of the electromagnetic actuator according to the embodiment of the present invention.

FIG. 6 is a view showing the principle of the opening operation of the electromagnetic actuator according to the embodiment of the present invention.

FIG. 7 is a side view showing a configuration of a vacuum interrupting device according to a conventional example.

FIG. 8 is a perspective sectional view showing a configuration of an electromagnetic actuator according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Distribution board 21,22,23 ... Support 31,32,33 ... Vacuum valve 41,42,43 ... Operation rod 5 ... Support 61,62,63 ... Insulation operation rod 71,72,73 ... Electromagnetic repulsion coil 81 , 82, 83 ... wipe spring 9 ... connecting bar 10 ... operating mechanism 10 '... electromagnetic actuator 111 ... operating rod 112 ... yoke 113 ... stopper plate 114 ... armature 1141 ... protrusion 115, 116 ... gap 117 ... solenoid coil 119 ... permanent Magnet 11 Open circuit spring 12 Hook 200 Hollow part 201, 202, 203 Hollow part 301, 302 Flat wall

Continuing from the front page (72) Inventor Jun Matsuzaki 1 Toshiba-cho, Fuchu-shi, Tokyo In-house Fuchu Office, Toshiba Corporation (72) Inventor Takao Wakabayashi 1-futoshi-cho, Fuchu-shi, Tokyo, Japan Fuchu Office Toshiba (72) Invention Person Mitaka Homma 1 Toshiba-cho, Fuchu-shi, Tokyo F-term in the Fuchu office of Toshiba Corporation (reference) 5G028 AA05 AA17 CB01 DB02 DB08 EB08

Claims (4)

[Claims] An operating means for opening and closing a circuit breaker through a movable shaft by movably operating an operating shaft, wherein the movable direction of the operating shaft and the movable direction of the movable shaft in the operating means are the same. And a biasing means for biasing the movable shaft in a direction in which the circuit breaker is closed so that the operating shaft and the movable shaft are connected to each other. And shut off device. 2. A yoke for forming a magnetic path having a cylindrical shape, an armature provided in the yoke and provided to be movable with a predetermined axis, and an armature provided in the yoke and provided in the yoke. An electromagnetic actuator, comprising: a magnet that generates a magnetic force for moving the coil; and a coil that is provided in the yoke and generates a magnetic flux that increases and decreases the magnetic force. 3. The electromagnetic actuator according to claim 2, wherein the magnet is provided inside the coil. 4. The electromagnetic actuator according to claim 2, wherein a gap is provided between the armature and the inner wall of the yoke in two stages.