JP2003123598A - Electromagnetic disconnecting switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic disconnecting switch capable of being used even under high frequency and large-current. SOLUTION: This electromagnetic disconnecting switch comprises fixed electrodes 2 provided with cooling channels, movable electrodes 1 mounted oppositely to the fixed electrodes 2 and provided with cooling channels, connecting conductors 20 integrally formed on each of the fixed electrodes 2, and an electromagnet 4 for allowing the movable electrodes 1 to be abutted on and separated from the fixed electrodes 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic disconnector which can be used for applications such as switching of high frequency and large current circuits and switching.

[0002]

2. Description of the Related Art Conventionally, electromagnetic disconnectors have been used for applications such as switching of high-frequency and large-current circuits and switching. FIG. 7 shows an example of a sectional structure of a conventional electromagnetic disconnector. In FIG. 7, the exciting coil 12 is passed through the exciting coil terminal 125.
When 6 is energized, the magnetic flux generated by the
And the movable iron core 128 is linked to the movable iron core 128, and the movable iron core 128 is attracted and moved by the fixed iron core 127. At this time, the movable iron core 128
The movable electrode 124, which is integrally provided via the insulating material 130 and the insulator 130, also moves, and its two contacts are the two fixed electrodes 12.
Touch 3. As a result, the external circuit connected between the fixed electrodes 123 changes from the open state to the closed state. Each fixed electrode 123 has a connection conductor 13 extending outwardly in a direction perpendicular to the moving direction of the movable electrode 124 and away from each other.
1 and an external circuit is connected to these connection conductors 131.

[0003]

The above-mentioned conventional electromagnetic disconnector is provided with a high frequency (for example, several kHz to several 100 kHz),
When applied to a large current circuit (for example, several thousand A),
The following issues were not realized. (1) The current capacity is small. When a high-frequency current flows through the conductor, the current flows only on the surface of the conductor. Therefore, the higher the frequency, the larger the conductor resistance. Therefore, even with the same applied current, the higher the frequency, the higher the heat generation density of the conductor and the contact portion. Therefore, the conventional electromagnetic disconnector shown in FIG. 7 was able to flow only a current of about 1000 A at several kHz. (2) Large inductance. The larger the area of the loop through which the current flows, the larger the inductance of the circuit. Since the conventional electromagnetic disconnector is originally for low frequencies, the connection conductor 131 to the fixed electrode 123 to the movable electrode 124
~ Fixed electrode 123 ~ Connection conductor 131 has a wide loop and a large inductance. If the disconnector has a large inductance, it may not be used in a high-frequency, large-current circuit for the following reasons. The undesired voltage drop in the circuit is proportional to frequency x current x inductance. The higher the frequency, the larger the current,
If the inductance of the circuit is not small, it becomes necessary to compensate for the large voltage drop. Depending on the method of the high frequency power supply, if the inductance of the load circuit exceeds a certain value, it becomes inoperable (for example,
In case of current type inverter of load resonance circuit tracking type).

Therefore, it is an object of the present invention to provide an electromagnetic disconnector which can be used even at high frequencies and large currents.

[0005]

According to the present invention, there are provided a plurality of fixed electrodes having a cooling flow path formed therein, and a movable electrode having a cooling flow path formed so as to be opposed to the plurality of fixed electrodes.
The above-mentioned problem is solved by an electromagnetic disconnector characterized by including a connection conductor integrally formed with each of a plurality of fixed electrodes, and an electromagnet that makes the movable electrode contact with and separate from the fixed electrode. In the electromagnetic disconnector of the present invention, the fixed electrode and the movable electrode are provided with the cooling flow paths, so that the fixed electrode and the movable electrode can be forcibly cooled. Therefore,
It is possible to energize without problems even with heat generation density when energizing at high frequency and large current. Further, in the electromagnetic disconnector of the present invention, since the connection conductor is integrally formed with the fixed electrode, the connection conductor-fixed electrode-
Since the loop formed by the movable electrode, the fixed electrode and the connecting conductor is narrow, the structure has a low inductance applicable to high frequency and large current applications. Although copper can be used as the electrode material of the fixed electrode and the movable electrode, a contact member made of silver is welded to the contact portions of the fixed electrode and the movable electrode to improve electrical contact. It is desirable to provide such means.

In the electromagnetic disconnector of the present invention, it is desirable to provide a pressing mechanism for pressing the movable electrode against the plurality of fixed electrodes and releasing the pressing. This pressing force gives a stable contact force between the fixed electrode and the movable electrode. Further, the electromagnetic disconnector of the present invention can be provided with a switch for notifying the on / off state to the outside when the movable electrode comes into contact with or separates from the fixed electrode. Further, the electromagnetic disconnector of the present invention is preferably provided with a plurality of electromagnets for driving the movable electrode.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on embodiments. (First Embodiment) FIGS. 1 to 3 are external views of an electromagnetic disconnector as a first embodiment. 1 is a front view, FIG. 2 is a plan view, and FIG. 3 is a side view. The electromagnetic disconnector according to the first embodiment includes two fixed electrodes 2 made of copper,
The movable electrode 1 made of copper that moves up and down with respect to the fixed electrode 2 and the connection conductor 20 integrally formed with the fixed electrode 2 are the main constituent elements.

1 to 3, the fixed electrode 2 integrated with the connecting conductor 20 is fixed to the base plate 8.
A cooling water nipple 18 is connected to the fixed electrode 2, and the cooling water supplied through the cooling water nipple 18 flows through a cooling channel (not shown) formed in the fixed electrode 2 to Cool 2. A silver contact is welded to the contact portion of the fixed electrode 2 with the movable electrode 1. An external circuit that is opened and closed is connected to the connection conductor 20 that is integrally connected to the fixed electrode 2.

The movable electrode 1 is held by a holding plate 9 via a movable electrode holder 11. Movable electrode 1 and holding plate 9
A pressing spring 10 for urging the movable electrode 1 toward the fixed electrode 2 is provided between them. The pressing spring 10 constitutes the pressing mechanism of the present invention, and when the movable electrode 1 is in contact with the fixed electrode 2, the pressing spring 10 makes constant contact between the movable electrode 1 and the fixed electrode 2. Give pressure. A cooling water nipple 18 is also connected to the movable electrode 1, and the cooling water supplied via the cooling water nipple 18 flows through a cooling flow path (not shown) formed in the movable electrode 1 to move. The electrode 1 is cooled.

A column 21 is erected on the base plate 8, and an electromagnet mounting plate 7 is fixed to the upper end of the column 21. The electromagnet 4 is attached to the electromagnet attachment plate 7. The electromagnet 4 includes a yoke 13 as its element. The electromagnet 4 is configured such that the yoke 13 moves downward when the electromagnet 4 is energized. On the electromagnet mounting plate 7,
The bearing 6 for sliding the guide shaft 5 in the vertical direction is
It is provided on the left and right of it. A connecting plate 14 is fixed to the upper end of the guide shaft 5 that slides on the bearing 6, and a yoke 13 is connected to the connecting plate 14. on the other hand,
A pressing plate 9 is fixed to the lower end of the guide shaft 5.

Therefore, by energizing the electromagnet 4, the yoke 13 is attracted and descends, and the guide shaft 5 descends through the connecting plate 14 as the yoke 13 descends. As described above, since the pressing plate 9 for fixing the movable electrode 1 is attached to the lower end of the guide shaft 5, the movable electrode 1 descends so as to come into contact with the fixed electrode 2 as the guide shaft 5 descends. .

A return spring 12 is arranged on the outer circumference of the guide shaft 5. This return spring 12 has a bearing 6
Since it is sandwiched between the connecting plate 14 and the connecting plate 14,
Is urged upward. Therefore, the yoke 13 constituting the electromagnet 4 is pushed upward through the return spring 12, the guide shaft 5 and the connecting plate 14 when the electromagnet 4 is not energized. Further, the limit switch 1 is attached to the connecting plate 14.
A dog 15 for 7 operations is provided (FIG. 3).

When the exciting coil (not shown) of the electromagnet 4 is energized via the terminal block 19, the yoke 13 is attracted downward against the return spring 12 by the electromagnetic force. The holding plate 9 connected to the yoke 13 via the connecting plate 14 and the guide shaft 5 is pressed downward simultaneously with the suction of the yoke 13. Then, the movable electrode 1 is pressed against the fixed electrode 2. At this time, due to the pressing force of the pressing spring 10,
The movable electrode 1 and the fixed electrode 2 receive a predetermined contact pressure.
To reduce the contact resistance when a large current is applied, moveable electrode 1
A constant contact pressure between the fixed electrode 2 and the fixed electrode 2 is required. The pressing force of the pressing spring 10 applies this constant pressure between the movable electrode 1 and the fixed electrode 2.

When a high frequency and a large current flow between the movable electrode 1 and the fixed electrode 2 when the electromagnet 4 is energized, the cooling water is passed through the cooling water nipple 18 to the cooling flow path of the movable electrode 1 and the fixed electrode 2. Supply. Here, the coupling plate 14 is provided with a dog 15 for operating the limit switch 17. Therefore, as the yoke 13 is moved up and down by energizing and de-energizing the electromagnet 4, the limit switch 17 is turned on / off by the dog 15, and the on / off state of the disconnector is turned to the outside via the wiring and the terminal block 19. You can be notified.

In the disconnector according to the first embodiment described above, since the movable electrode 1 and the fixed electrode 2 are water-cooled and the silver contacts are welded, there is no problem in the heat generation density at the time of high frequency and large current application. It is possible to energize. In addition, the movable spring 1 receives pressure from the pressing plate 10 that is pressed integrally with the yoke 13 that is attracted by the electromagnet 4 by the pressing spring 10.
The required contact pressure can be obtained between the fixed electrode 2 and the fixed electrode 2.
Furthermore, since the connection conductor 20 is formed integrally with the fixed electrode 2, the connection conductor 20-fixed electrode 2-movable electrode 1-
The loop of the fixed electrode 2 to the connection conductor 20 becomes narrow, and the low inductance structure applicable to high frequency and large current applications is obtained. Further, the disconnector according to the present embodiment has the movable electrode 1
Since the electromagnet 4 is used as the driving source of the above, another operation source such as air pressure is unnecessary.

In the disconnector of the first embodiment, 25 kHz ×
It was confirmed that there was no problem in continuous energization of 4000A. The inductance at that time was an extremely small value of about 0.05 μH.

(Second Embodiment) FIGS. 4 to 6 are external views of an electromagnetic disconnector according to a second embodiment. In addition,
4 is a front view, FIG. 5 is a plan view, and FIG. 6 is a side view. The electromagnetic disconnector according to the second embodiment includes two fixed electrodes 2 made of copper, a movable electrode 1 made of copper that moves up and down with respect to the fixed electrode 2, and a connection conductor 20 integrally formed with the fixed electrode 2. This is the same as the electromagnetic disconnector according to the first embodiment in that the main component is. The difference is that the first embodiment is a device with one electromagnet 4, whereas the second embodiment is a device with two electromagnets 4.

In FIGS. 4 to 6, the fixed electrode 2 integrated with the connecting conductor 20 is fixed to the base plate 8.
A cooling water nipple 18 is connected to the fixed electrode 2, and the cooling water supplied through the cooling water nipple 18 flows through a cooling channel (not shown) formed in the fixed electrode 2 to Cool 2. A silver contact is welded to the contact portion of the fixed electrode 2 with the movable electrode 1. An external circuit that is opened and closed is connected to the connection conductor 20 that is integrally connected to the fixed electrode 2.

The movable electrode 1 is held by a holding plate 9 via a movable electrode holder 11. Movable electrode 1 and holding plate 9
A pressing spring 10 for urging the movable electrode 1 toward the fixed electrode 2 is provided between them. When the movable electrode 1 is in contact with the fixed electrode 2, the pressing spring 10 applies a constant contact pressure between the movable electrode 1 and the fixed electrode 2. A nipple 18 for cooling water is also connected to the movable electrode 1,
The cooling water supplied through the cooling water nipple 18 flows through a cooling flow path (not shown) formed in the movable electrode 1 to cool the movable electrode 1.

A guide shaft 5A is erected on the base plate 8. The lower end of the guide shaft 5A is supported by a bearing 6A attached to the base plate 8. On the other hand, an electromagnet mounting plate 7 is fixed to the upper end of the guide shaft 5A, and a holding plate 9 is mounted via a bearing 6C that slides on the guide shaft 5A.
Therefore, the holding plate 9 can be moved up and down along with the bearing 6C along the guide shaft 5A. A return spring 12A sandwiched between the bearing 6A and the bearing 6C is arranged on the outer periphery of the guide shaft 5A, and the pressing plate 9 is biased toward the electromagnet mounting plate 7 side.

Two electromagnets 4 are mounted on the electromagnet mounting plate 7. This electromagnet 4 has a yoke 13 as its element.
Is equipped with. The electromagnet 4 is configured such that the yoke 13 moves downward when the energization is performed. A guide shaft 5B is slidably provided on the electromagnet mounting plate 7 between two electromagnets 4 via a bearing 6B. A holding plate 9 is connected to the lower end of the guide shaft 5B. And the yoke 13 of the two electromagnets 4 is connected to the upper end of the guide shaft 5B via the connecting rod 14 '.

Therefore, by energizing the electromagnet 4, the yoke 13 is attracted and descends, and the guide shaft 5B descends along with the descending of the yoke 13 and via the connecting rod 14 '. As described above, since the pressing plate 9 for fixing the movable electrode 1 is attached to the lower end of the guide shaft 5B, the guide shaft 5
Along with the drop of B, the movable electrode 1 drops so as to come into contact with the fixed electrode 2.

A return spring 12B is arranged on the outer periphery of the guide shaft 5B. Since the return spring 12B is sandwiched between the bearing 6B and the connecting rod 14 ',
The connecting rod 14 'is biased upward. Therefore, yoke 13
Is pushed upward through the return spring 12B, the guide shaft 5B and the connecting rod 14 'when the electromagnet 4 is not energized. Further, the connecting rod 14 'is provided with a dog for operating the limit switch 17.

The magnitude of the current that can be passed when the disconnector is closed depends on the pressure on the contact surface of the silver contact when pressing the movable electrode 1 and the fixed electrode 2. In the first embodiment, as a means for increasing the pressure on the contact surface, the pressing force of the pressing spring 10 for pressing the movable electrode 1 from the pressing plate 9 is increased, and at the same time, an electromagnetic force capable of withstanding this reaction force is applied. An electromagnet 4 having the same is provided. In the second embodiment, the electromagnet 4 is set to 2
By providing one (herein called double throw), the pressure on the contact surface between the movable electrode 1 and the fixed electrode 2 is increased. Two yokes 1 respectively included in the two electromagnets 4
3 performs the same operation via the connecting rod 14 '. When the electromagnet 4 is not energized, the two yokes 13 are separated by the return spring 12A, the guide shaft 5A, the bearing 6A and the holding plate 9.
It is pushed up. Also, to adjust the return force,
A return spring 12B, a guide shaft 5B, and a bearing 6B are provided. The return force can be adjusted by changing the length of the bearing 6B and the length of the return spring 12B in the initial state.

When the exciting coils (not shown) of the two electromagnets 4 are simultaneously energized via the terminal block 19, the two yokes 13 are simultaneously attracted downward by the electromagnetic force. Then, the pressing plate 9 is pressed downward at the same time when the yoke 13 is sucked. In the movable electrode 1 held by the holding plate 9 via the movable electrode holder 11, the holding plate 9 has an electromagnet 4
It is pressed downward by the energization of and is pressed against the fixed electrode 2 at the same time. A constant contact pressure is required between the movable electrode 1 and the fixed electrode 2 in order to reduce the contact resistance when a large current is applied. To obtain the contact pressure between these electrodes,
A pressing spring 10 is provided between the holding plate 9 and the movable electrode 1. As the pressing spring 10 in the double throw type, one having a larger spring force than that of the single throw type of the first embodiment is used. The limit switch 17 is turned on / off as the yoke 13 and the connecting rod 14 'are moved up and down, and the on / off state of the disconnector is notified to the outside through the wiring and the terminal block 19.

The disconnector according to the second embodiment described above can also obtain the same effect as that of the first embodiment, but in particular, in the second embodiment, since two electromagnets 4 are provided, The pressing force of the pressing spring 10 can be increased. In addition, in the disconnector of the second embodiment, 45
It was confirmed that there was no problem in continuous energization of 0 Hz × 10000A. The inductance at that time was an extremely small value of about 0.06 μH. Furthermore, the first embodiment, the second
In both the embodiments, it has been confirmed that there is no problem with the frequency of the energizing current up to 100 kHz. However, the higher the frequency of the energizing current, the smaller the energizable current is, which is similar to the frequency dependence of the rated current of a normal wiring. It should be noted that the water-cooled movable electrode 1 and the fixed electrode 2 made it possible to carry a high frequency and a large current. However, if the current is relatively small, the same structure can be used without cooling water. For example, in the experiment in which the cooling water was not passed using the disconnector of the first embodiment, there was no problem in continuous energization of 100 kHz × 300A. Furthermore, the double throw type of the second embodiment can be further developed to increase the number of electromagnets 4, or the parallel connection of disconnecting switches can be applied to further increase the current.

[0027]

As described above, according to the present invention,
High frequency (up to 100 kHz or more), large current (up to about 1000)
A disconnector capable of energizing 0 A) is realized.

[Brief description of drawings]

FIG. 1 is a front view of an electromagnetic disconnector according to a first embodiment of the present invention.

FIG. 2 is a plan view of the electromagnetic disconnector according to the first embodiment of the present invention.

FIG. 3 is a side view of the electromagnetic disconnector according to the first embodiment of the present invention.

FIG. 4 is a front view of an electromagnetic disconnector according to a second embodiment of the present invention.

FIG. 5 is a plan view of an electromagnetic disconnector according to a second embodiment of the present invention.

FIG. 6 is a side view of an electromagnetic disconnector according to a second embodiment of the present invention.

FIG. 7 is a view showing a cross-sectional structure of a conventional electromagnetic disconnector.

[Explanation of symbols]

1 ... Movable electrode, 2 ... Fixed electrode, 4 ... Electromagnet, 5, 5A,
5B ... Guide shaft, 6, 6A, 6B, 6C ... Bearing, 7 ...
Electromagnet mounting plate, 8 ... Base plate, 9 ... Holding plate, 10 ... Pressing spring, 11 ... Movable electrode holder, 12, 12A, 12
B ... Return spring, 13 ... Yoke, 14, 14 '... Connecting plate, 1
5 ... Dog, 17 ... Limit switch, 18 ... Cooling water nipple, 19 ... Terminal block, 20 ... Connection conductor, 21 ... Column

Continued front page    (72) Inventor Ikuo Wakamoto             4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture               Mitsubishi Heavy Industries Ltd. Hiroshima Research Center (72) Inventor Kazuya Tsurusaki             2-4-3 Jonanjima, Ota-ku, Tokyo Stocks             Company Eguchi High Frequency (72) Inventor Taketoshi Eguchi             2-4-3 Jonanjima, Ota-ku, Tokyo Stocks             Company Eguchi High Frequency (72) Inventor Nobuo Iwama             2-4-3 Jonanjima, Ota-ku, Tokyo Stocks             Company Eguchi High Frequency F-term (reference) 5E048 AB04 AD07                 5G028 DB01 DB04

Claims (4)

[Claims] 1. A plurality of fixed electrodes in which cooling channels are formed, a movable electrode which is arranged facing the plurality of fixed electrodes and in which cooling channels are formed, and each of the plurality of fixed electrodes. An electromagnetic disconnector comprising: an integrally formed connection conductor; and an electromagnet that contacts and separates the movable electrode from the fixed electrode. 2. The electromagnetic disconnector according to claim 1, further comprising a pressing mechanism that presses the movable electrode against the plurality of fixed electrodes and releases the pressing. 3. The electromagnetic disconnector according to claim 1 or 2, further comprising a switch for notifying an on / off state to the outside when the movable electrode comes into contact with or separates from the fixed electrode. 4. The electromagnetic disconnector according to claim 1, further comprising a plurality of the electromagnets.