JP7353220B2 - Electromagnetic operated switchgear - Google Patents

Description

The present invention relates to an electromagnetically operated switching device.

As a prior art related to an electromagnetically operated switchgear, there is Patent Document 1. Patent Document 1 includes a solenoid coil, a plunger that passes through the solenoid coil, and a fixed core that has the solenoid coil inside. In an electromagnet, the magnetic flux generated by a permanent magnet flows through the surface to maintain the attracted state, and the plunger's attracted state is released by flowing a current in the opposite direction to the solenoid coil to the solenoid coil. An electromagnet is described in which a gap is formed in the center of at least one side of the center leg.

JP2003-151826

Patent Document 1 describes an electromagnet with excellent operational stability. However, in Patent Document 1, the parts that make up the electromagnet, such as the movable core, fixed core, and coil, are each cylindrical in shape and arranged coaxially, so the depth of the space in which the electromagnetically operated switchgear is installed is limited. The dimensions are determined by the outer diameter of the electromagnet. If you want to increase the operating speed required for the interrupter, the operating speed and the outer diameter of the electromagnet are in a proportional relationship, so the outer diameter of the electromagnet will inevitably increase, and the electromagnetically operated switchgear increases in size.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetically operated switchgear that can suppress an increase in size even when it is desired to increase the operating speed of a shutoff section.

A preferred example of the present invention includes a main circuit opening/closing section having a cutoff section, an operating mechanism section having a movable iron core, a fixed iron core, and a coil, and a link mechanism section connecting the main circuit opening/closing section and the operating mechanism section. The fixed core of the operating mechanism section includes a portion of a partition plate disposed between the operating mechanism section and the main circuit opening/closing section, a portion of a side plate of the operating mechanism section, and the operating mechanism section. This is an electromagnetically operated switching device that includes at least one part of the front plate of the section .

According to the present invention, it is possible to realize an electromagnetically operated opening/closing device that can suppress an increase in size.

1 is a schematic diagram of an electromagnetically operated switchgear according to a first embodiment; FIG. FIG. 3 is a plan view of an electromagnetically operated switchgear as a comparative example. FIG. 2 is a plan view of the electromagnetically operated switchgear according to the first embodiment. FIG. 3 is a plan view of an electromagnetically operated switchgear according to a second embodiment. FIG. 7 is a plan view of an electromagnetically operated switchgear according to a third embodiment. FIG. 7 is a plan view of an electromagnetically operated switchgear according to a fourth embodiment. FIG. 7 is a plan view of an electromagnetically operated switchgear according to a fifth embodiment. FIG. 7 is a schematic diagram of an electromagnetically operated switchgear according to a sixth embodiment.

Embodiments of the electromagnetically operated switchgear of the present invention will be described below with reference to the drawings. It should be noted that the following examples are merely examples suitable for carrying out the present invention, and are not intended to limit the scope of application of the present invention.

FIG. 1 shows a schematic side view of the electromagnetically operated switchgear of Example 1, and shows a state in which the switch is turned on. The electromagnetically operated switchgear shown in FIG. 1 consists of a main circuit switching section 1 shown on the left side of FIG. 1, an operation mechanism section 2 shown on the right side of FIG. 1, and a link mechanism section 3 shown on the bottom side of FIG. It is configured.

The main circuit switching section 1 is covered with an insulating frame 4. The insulating frame 4 of the main circuit opening/closing section 1 is fixed to a link mechanism section case 6. As an example, FIG. 1 shows a configuration in which the main circuit switching section 1 is fixed to a link mechanism section case 6. As shown in FIG. Although FIG. 1 shows a one-phase circuit breaker as an example of an electromagnetically operated switching device, a three-phase circuit breaker may also be used. In this case, the main circuit switching sections 1 are arranged side by side in the depth direction of FIG. The configuration is as follows.

The main circuit switching section 1 electrically connects a fixed conductor 8, a vacuum valve 9 having a pair of detachable contacts as a cutoff section, a movable conductor 10, and the vacuum valve 9 and the movable conductor 10. A flexible conductor 11, an insulating frame 4 that electrically insulates these from the operating mechanism section 2 and link mechanism section 3, an insulating rod 12 that moves the movable side of the vacuum valve 9 in the vertical direction, and contacts in the vacuum valve 9. It is composed of a contact pressure spring 13 that applies a contact load to the contact pressure spring 13, and a connecting plate 14 that pushes up the contact pressure spring 13.

The operating mechanism section 2 also opens the contacts of the permanent magnet 15, the coil 16, the movable core 50, the first fixed core 51, the second fixed core 52, the third fixed core 53, and the vacuum valve 9. It consists of a cutoff spring 18 and a drive rod 19 disposed on these axes.

Further, the link mechanism section 3 includes a shaft 20 bearing on the link mechanism section case 6, and a first lever fixed to the shaft 20 and connected to the connecting plate 14 of the main circuit opening/closing section 1 with a first pin 21. 22, and a second lever 24 which is also fixed to the shaft 20 and connected to the drive rod 19 of the operating mechanism section 2 by a second pin 23.

With the above configuration, the vertical linear movement of the drive rod 19 of the operating mechanism section 2 is transmitted to the movable side of the vacuum valve 9 via the second lever 24 and the first lever 22, and the contacts of the vacuum valve 9 are opened and closed. be done.

Here, when a closing command is input to the operating mechanism section from a control board (not shown), the electromagnetic coil 16 is energized, and the coil 16 is surrounded by movable core 50 ⇒ first fixed core 51 ⇒ second A magnetic field is formed along the path of fixed iron core 52 ⇒ third fixed iron core 53 ⇒ movable iron core 50 . The magnetic field exerts a downward attractive force on the bottom side end surface of the movable iron core 50, and the movable iron core 50 moves toward the first fixed iron core 51, so that the movable iron core 50 is attracted to the first fixed iron core 51.

At this time, the direction of the magnetic field formed by the permanent magnet is also the same as the direction of the magnetic field generated with the excitation of the coil 16, so the movable iron core 50 moves to the first fixed iron core 51 side with the attraction force increased. Moving. The first fixed core 51, the second fixed core 52, and the third fixed core 53 are collectively referred to as a fixed core.

When the closing operation is performed by the electromagnet, the drive rod 19 connected to the movable iron core 50 moves downward against the elastic force of the cutoff spring, and the driving force accompanying the electromagnetic force generated by the electromagnet is transmitted to the lever. . This driving force is transmitted to the connecting plate 14 via the second lever 24 and the first lever 22, the movable conductor moves upward, the movable contact contacts the fixed contact, and the vacuum circuit breaker equipped with the vacuum valve 9 A charging operation is performed.

In the closing operation of a vacuum circuit breaker, the contact pressure spring is not compressed until the fixed contact and the movable contact come into contact, but it is compressed when the fixed contact and the movable contact come into contact, and then continues to be compressed until the closing operation is completed. On the other hand, the cutoff spring remains compressed during the closing operation of the vacuum circuit breaker.

Next, when an opening command is input to the control board and a signal associated with the opening command is output from the control board to the coil 16, a current flows through the coil 16 in the opposite direction to that when it was turned on, and the current flows around the coil 16. A magnetic field is formed in the direction opposite to that during the closing operation. In this case, the magnetic flux generated from the coil 16 and the magnetic flux generated from the permanent magnet cancel each other out, and the attractive force at the axial end face of the movable iron core 50 becomes weaker than the elastic force generated from the cutoff spring and the contact spring. , the movable iron core 50 separates from the first fixed iron core 51 and moves upward.

When the drive rod 19 moves upward with the movement of the movable iron core 50, the connecting plate 14 moves downward in conjunction with the upward movement of the second lever 24, and the movable contact of the vacuum circuit breaker becomes a fixed contact. The fixed contact and the movable contact are separated from each other, and the vacuum circuit breaker is opened. In this case, when the electromagnet is released from being held in the closed state, the compressed contact pressure spring first expands, and when the contact pressure spring holder comes into contact with the washer, the fixed and movable contacts of the vacuum breaker The contact with the vacuum circuit breaker is broken, and the vacuum circuit breaker performs the interrupting operation.

FIG. 2 is a diagram showing a plan view of an electromagnetically operated switchgear as a comparative example. Here, the case of a three-phase circuit breaker is shown. A U-phase vacuum valve 9A, a V-phase vacuum valve 9B, and a W-phase vacuum valve 9C are arranged in a line in the vertical direction of FIG. 3 in the main circuit switching section 1.

The operating mechanism section 2 includes a front plate 42 disposed on the front side, side plates 43 disposed on the left and right as viewed from the front, and a partition plate 41 disposed between the main circuit opening/closing section 1 and the operating mechanism section 2. It is surrounded by a board. In the operation mechanism section 2, a movable iron core 50, a coil 16, and a second fixed iron core 52 are arranged outward from the drive rod 19. Here, the drive rod 19, the movable core 50, the coil 16, and the second fixed core 52 have circular cross-sectional shapes. The outermost second fixed core is arranged in the operating mechanism section 2 at a position where it does not come into contact with the plate section.

FIG. 3 is a diagram showing a plan view of the electromagnetically operated switchgear according to the first embodiment. Description of the same parts as in FIG. 2 will be omitted. In FIG. 3, unlike FIG. 2, the partition plate 41 made of a magnetic material is a part of the second fixed iron core 52. Here, the drive rod 19, the movable core 50, the coil 16, and a portion of the second fixed core 52 have a circular cross-sectional shape. Circular is not limited to a perfect circle, but also includes an ellipse. In the case of an elliptical shape, it is desirable that the radius in the horizontal direction of the figure is shorter than the radius in the vertical direction. Therefore, the length from the partition plate 41 to the front plate 42 can be shortened, and the electromagnetically operated switching device can be made smaller.

According to the first embodiment, a partition plate made of a magnetic material is arranged between the main circuit switching section 1 and the operating mechanism section 2, and the partition plate is a part of the second fixed core 52, which is the outer peripheral steel plate of the electromagnet. It is used as part of the magnetic flux path to operate the electromagnet. Since the electromagnetically operated switchgear configured in this manner can maintain operating speed without increasing the outer diameter of the electromagnet, the operating mechanism section 2 can be made smaller, and the electromagnetically operated switcher can also be made smaller.

FIG. 4 is a plan view showing the electromagnetically operated switchgear according to the second embodiment. Description of parts similar to those in Example 1 will be omitted.

In the electromagnetically operated switchgear of this embodiment, a magnetic material plate is arranged on the side plate 43, and the side plate 43 is a part of the second fixed iron core 52. With such a configuration, the space between the upper side plate 43 and the lower side plate 43 in the operating mechanism section 2 of FIG. 4 can be widened. Therefore, it is possible to arrange devices that are vertically long in the figure in that space.

In the configuration shown in FIG. 4, the length from the partition plate 41 to the front plate 42 is the same as that of the comparative example, but a part of the second fixed core 52 on the outermost periphery is part of the partition on the left side of the figure. If it is constituted by the plate 41, the length from the partition plate 41 to the front plate 42 can also be reduced as in the first embodiment.

According to the second embodiment, the space between the upper side plate 43 and the lower side plate 43 can be increased. Further, the side plate 43 is used as a part of the second fixed core 52, which is the outer peripheral steel plate of the electromagnet, that is, as a part of the magnetic flux path, so that the electromagnet operates. Since the electromagnetically operated switchgear configured in this manner can maintain operating speed without increasing the outer diameter of the electromagnet, the operating mechanism section 2 can be made smaller, and the electromagnetically operated switcher can also be made smaller.

FIG. 5 is a plan view showing the electromagnetically operated switchgear according to the third embodiment. Description of parts similar to those in Example 1 will be omitted. In the third embodiment, the shape is rectangular except for a portion of the movable core 50 surrounding the drive rod 19, the coil 16, and the second fixed core 52. Since the length in the horizontal direction of the figure (direction from the partition plate 41 to the front plate 42) is shorter than the length in the vertical direction of the figure, the electromagnetic waveform is shorter in the horizontal direction than in Examples 1 and 2. Operable switchgear can be realized. Further, the corners of the coil 16 are not limited to right angles, and may have curved portions.

According to the third embodiment, compared to the circular movable core 50, coil 16, and second fixed core 52 of the first and second embodiments, the direction from the partition plate 41 to the front plate 42 can be made shorter. , the operating mechanism section 2 can be made smaller, and the electromagnetically operated switching device can also be made smaller.

FIG. 6 is a plan view showing the electromagnetically operated switchgear according to the fourth embodiment. Description of parts similar to those in Example 1 will be omitted. Both the partition plate 41 and the side plate 43 are part of the second fixed iron core 52. Moreover, it is circular except for a portion of the movable core 50 surrounding the drive rod 19, the coil 16, and a portion of the second fixed core 52.

In the fourth embodiment, since a part of the second fixed iron core 52 is composed of both the partition plate 41 and the side plate 43, the length from the partition plate 41 to the front plate 42 is further shortened compared to the first embodiment. It can be made shorter, and the electromagnetic operated switchgear can be made smaller.

FIG. 7 is a plan view showing an electromagnetically operated switchgear according to the fifth embodiment. Descriptions of parts similar to those in Example 3 and Example 4 will be omitted. It has a rectangular shape except for a portion of the movable core 50 surrounding the drive rod 19, the coil 16, and a portion of the second fixed core 52.

According to the fifth embodiment, compared to the circular movable core 50, coil 16, and second fixed core 52 of the fourth embodiment, the direction from the partition plate 41 to the front plate 42 can be shortened, and the operating mechanism section 2 can be made smaller, and the electromagnetically operated switching device can also be made smaller.

FIG. 8 is a schematic diagram showing an electromagnetically operated switchgear according to the sixth embodiment. Description of parts similar to those in Example 1 will be omitted. The main circuit switching section 1 includes an insulating spacer 32 on the fixed side, a shield electrode 30 on the fixed side, a vacuum valve 9, a shield electrode 31 on the movable side, an insulating spacer 33 on the movable side, and a sealed container 60.

A vacuum valve 9, which serves as a shutoff unit and is arranged in the main circuit opening/closing unit 1, is used to operate an insulating gas such as sulfur hexafluoride or a mixed gas whose main components are nitrogen and oxygen, such as dry air, at a pressure higher than atmospheric pressure. It is housed in a sealed container 60. A plate portion of the airtight container 60 facing the operating mechanism section 2 functions as a partition plate 41. The operating mechanism section 2 is surrounded by a front plate 42 and side plates as in the first embodiment.

The structure of the plate part and the electromagnet of the operating mechanism section 2 is any one of the structures described in the first to fifth embodiments. The electromagnetically operated switchgear configured in this manner can obtain the same effects as those of the first to fifth embodiments.

DESCRIPTION OF SYMBOLS 1... Main circuit opening/closing part, 2... Operating mechanism part, 3... Link mechanism part, 4... Insulating frame, 6... Link mechanism part case, 8... Fixed side conductor, 9... Vacuum valve, 10... Movable side conductor, 11... Flexible conductor, 12... Insulating rod, 13... Contact pressure spring, 14... Connection plate, 15... Permanent magnet, 16... Coil, 18... Shutoff spring, 19... Drive rod, 20... Shaft, 21... First pin, 22 ...first lever, 23...second pin, 24...second lever, 41...partition plate, 42...front plate, 43...side plate, 50...movable iron core, 51...first fixed iron core, 52...th 2 fixed iron core, 53... third fixed iron core

Claims (3)

a main circuit opening/closing section having a cutoff section;
an operating mechanism section having a movable iron core, a fixed iron core, and a coil;
a link mechanism unit that connects the main circuit opening/closing unit and the operating mechanism unit;
A part of the fixed core of the operating mechanism section is a part of a partition plate disposed between the operating mechanism section surrounding the operating mechanism section and the main circuit opening/closing section, and a part of the side plate of the operating mechanism section. an electromagnetically operated opening/closing device comprising at least one part of a front plate of the operating mechanism section ; The electromagnetically operated switchgear according to claim 1 ,
The movable iron core, the fixed iron core, and the coil each have a circular cross section. The electromagnetically operated switchgear according to claim 1 ,
The movable iron core, the fixed iron core, and the coil each have a rectangular cross section.

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