JP6903232B1 - Circuit breaker - Google Patents

Abstract

The circuit breaker (100) includes a fixed electrode (3), a movable portion (4), a fixed plate (1), and a movable plate (2). The fixed plate (1) and the movable plate (2), which are magnetic materials, are connected to the fixed plate (1) through a gap when the fixed electrode (3) and the movable electrode (41) of the movable portion (4) are in contact with each other. It is arranged so that a magnetic attraction force is generated between the movable plate (2) and the movable plate (2). When viewed from the axial direction, each of the plurality of fixed-side first parts (11) of the fixed plate (1) overlaps with each of the plurality of movable-side second parts (22), and a plurality of movable plates (2) are formed. Each of the movable side first part (21) overlaps with each of the plurality of fixed side second parts (12). Each of the plurality of fixed-side first parts (11) is integrally configured. Each of the plurality of movable side first parts (21) is integrally configured.

Description

The present invention relates to a circuit breaker.

Conventionally, there is a circuit breaker that uses the axial magnetic attraction force generated in the fixed plate and the movable plate to maintain the closed pole state. The closed electrode state is a state in which the movable electrode is in contact with the fixed electrode. The open electrode state is a state in which the movable electrode is separated from the fixed electrode. For example, in the circuit breaker described in Japanese Patent Application Laid-Open No. 52-05573 (Patent Document 1), the movable plate (lower magnetic material) faces the fixed plate (upper magnetic material) with a gap. When an electric current is passed through the movable plate and the movable shaft penetrating the center of the fixed plate, magnetic flux is generated in each of the movable plate and the fixed plate in the circumferential direction. Each of the fixed plate and the movable plate is divided by a gap extending in the radial direction of the movable shaft. Therefore, the magnetic flux is divided by the gap extending in the radial direction of the movable shaft, and passes through the gap provided between the fixed plate and the movable plate. As a result, an axial magnetic flux is generated between the fixed plate and the movable plate, so that an axial magnetic attraction force is generated in the fixed plate and the movable plate.

Japanese Unexamined Patent Publication No. 52-05573

In the circuit breaker published in the above publication, each of the fixed plate and the movable plate is divided. Therefore, the axial positions of the divided plates and the divided movable plates are likely to shift. Therefore, the axial dimension of the gap provided between the fixed plate and the movable plate becomes non-uniform. Therefore, the magnetic attraction generated between the fixed plate and the movable plate is not stable.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a circuit breaker capable of providing a uniform clearance in the axial direction between a fixed plate and a movable plate.

The circuit breaker of the present invention includes a fixed electrode, a movable portion, a fixed plate, and a movable plate. The movable portion includes a movable electrode and a movable shaft. The movable electrode can be attached to and detached from the fixed electrode. The movable shaft is connected to the movable electrode. The relative position of the fixing plate with the fixed electrode is fixed. The fixing plate is a magnetic material. The movable plate faces the fixed plate with a gap. The movable plate is movable together with the movable part. The movable plate is a magnetic material. The fixed plate and the movable plate are arranged so that a magnetic attraction force is generated between the fixed plate and the movable plate through a gap when the fixed electrode and the movable electrode are in contact with each other. The fixing plate includes a plurality of fixed-side first parts and a plurality of fixed-side second parts. The plurality of fixed-side second portions have a lower magnetic permeance than the plurality of fixed-side first portions. The movable plate includes a plurality of movable side first portions and a plurality of movable side second portions. The plurality of movable side second parts have a lower magnetic permeance than the plurality of movable side first parts. When viewed from the axial direction, each of the plurality of fixed-side first parts overlaps with each of the plurality of movable-side second parts, and each of the plurality of movable-side first parts is a plurality of fixed-side second parts. It overlaps with each. The fixing plate includes a fixing side annular portion that is integrally formed with each of the plurality of fixing side first portions. The movable plate includes a movable side annular portion that is integrally formed with each of the plurality of movable side first portions. The plurality of fixed-side first portions and fixed-side annular portions are magnetic materials. The plurality of movable-side first portions and movable-side annular portions are magnetic materials.

According to the circuit breaker of the present invention, a plurality of fixed-side first parts of the fixed plate are integrally formed, and a plurality of movable-side first parts of the movable plate are integrally formed. Therefore, the positions of the fixed plate and the movable plate in the axial direction can be made uniform. Therefore, the axial dimension of the gap provided between the fixed plate and the movable plate can be made uniform.

It is a perspective view which shows schematic structure of the circuit breaker which concerns on Embodiment 1 of this invention. It is sectional drawing which shows schematic the structure of the circuit breaker in the closed pole state which concerns on Embodiment 1 of this invention. It is sectional drawing which shows schematic the structure of the circuit breaker in the open pole state which concerns on Embodiment 1 of this invention. It is a top view which shows schematic structure of the fixed plate which concerns on Embodiment 1 of this invention. It is a top view which shows roughly the structure of the fixing plate which concerns on 1st modification of Embodiment 1 of this invention. It is a top view which shows roughly the structure of the fixing plate which concerns on the 2nd modification of Embodiment 1 of this invention. FIG. 5 is a perspective view schematically showing a configuration of a movable portion, a fixed plate, and a movable plate in a closed pole state according to the first embodiment of the present invention. FIG. 5 is a perspective view schematically showing a configuration of a movable portion, a fixed plate, and a movable plate in an open pole state according to the first embodiment of the present invention. It is a top view which shows schematic structure of the movable plate which concerns on Embodiment 1 of this invention. It is a top view which shows roughly the structure of the movable plate which concerns on 1st modification of Embodiment 1 of this invention. It is a top view which shows roughly the structure of the movable plate which concerns on the 2nd modification of Embodiment 1 of this invention. FIG. 5 is a cross-sectional view schematically showing a configuration of a movable portion, a fixed plate, and a movable plate in a closed pole state according to the first embodiment of the present invention. FIG. 5 is a cross-sectional view schematically showing a configuration of a movable portion, a fixed plate, and a movable plate in an open pole state according to the first embodiment of the present invention. It is sectional drawing which shows the force generated in the circuit breaker in the closed pole state which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the force generated in the circuit breaker in the open pole state which concerns on Embodiment 1 of this invention. It is a perspective view which shows schematic structure of the fixed plate which concerns on Embodiment 2 of this invention. It is a perspective view which shows schematic structure of the movable plate which concerns on Embodiment 2 of this invention. FIG. 5 is a perspective view schematically showing a configuration of a movable portion, a fixed plate, and a movable plate in a closed pole state according to a second embodiment of the present invention. FIG. 5 is a perspective view schematically showing a configuration of a movable portion, a fixed plate, and a movable plate in an open pole state according to a second embodiment of the present invention. FIG. 5 is a cross-sectional view schematically showing a configuration of a movable portion, a fixed plate, and a movable plate in a closed pole state according to a second embodiment of the present invention. FIG. 5 is a cross-sectional view schematically showing a configuration of a movable portion, a fixed plate, and a movable plate in an open pole state according to a second embodiment of the present invention. FIG. 5 is a perspective view schematically showing a configuration of a movable portion, a fixed plate, and a movable plate in a closed pole state according to a third embodiment of the present invention. FIG. 5 is a perspective view schematically showing a configuration of a movable portion, a fixed plate, and a movable plate in an open pole state according to a third embodiment of the present invention. FIG. 5 is a cross-sectional view schematically showing a configuration of a movable portion, a fixed plate, and a movable plate in a closed pole state according to a third embodiment of the present invention. FIG. 5 is a cross-sectional view schematically showing a configuration of a movable portion, a fixed plate, and a movable plate in an open pole state according to a third embodiment of the present invention. It is a perspective view which shows schematic structure of the fixed plate which concerns on Embodiment 3 of this invention. It is a perspective view which shows schematic structure of the movable plate which concerns on Embodiment 3 of this invention. It is sectional drawing which shows schematic the structure of the circuit breaker in the closed pole state which concerns on Embodiment 4 of this invention. FIG. 5 is a perspective view schematically showing a configuration of a movable portion, a fixed plate, a movable plate, a fixed side support plate, and a movable side support plate in a closed pole state according to a fourth embodiment of the present invention. FIG. 5 is a cross-sectional view schematically showing a configuration of a movable portion, a fixed plate, a movable plate, a fixed side support plate, and a movable side support plate in a closed pole state according to a fourth embodiment of the present invention. FIG. 5 is a perspective view schematically showing a configuration of a movable portion, a fixed plate, a movable plate, a fixed side support plate, and a movable side support plate in an open pole state according to a fourth embodiment of the present invention. FIG. 5 is a cross-sectional view schematically showing a configuration of a movable portion, a fixed plate, a movable plate, a fixed side support plate, and a movable side support plate in an open pole state according to a fourth embodiment of the present invention.

Hereinafter, embodiments will be described with reference to the drawings. In the following, the same or corresponding parts will be designated by the same reference numerals, and duplicate description will not be repeated.

Embodiment 1.
The configuration of the circuit breaker 100 according to the first embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view schematically showing the configuration of the circuit breaker 100 according to the first embodiment. FIG. 2 is a cross-sectional view schematically showing the configuration of the circuit breaker 100 in the closed pole state according to the first embodiment. FIG. 3 is a cross-sectional view schematically showing the configuration of the circuit breaker 100 in the open pole state according to the first embodiment.

As shown in FIGS. 1 and 2, the circuit breaker 100 includes a fixed plate 1, a movable plate 2, a fixed electrode 3, a movable portion 4, a vacuum valve 5, an operating mechanism 6, and a circuit portion 7. Includes. The circuit unit 7 includes a fixed-side conductor 71, a movable-side conductor 72, and a circuit board (not shown). The circuit board (not shown) is connected to the fixed side conductor 71 and the movable side conductor 72.

The circuit breaker 100 in this embodiment is a vacuum circuit breaker including a vacuum valve 5 as shown in FIGS. 2 and 3. The circuit breaker 100 is not limited to the vacuum circuit breaker, and may be an air circuit breaker, a gas circuit breaker, or the like.

<About the configuration of the movable part 4>
Next, the configuration of the movable portion 4 according to the first embodiment will be described with reference to FIGS. 2 and 3. As shown in FIG. 2, the movable portion 4 includes a movable electrode 41, a movable shaft 42, a guide pin 43, and a movable side spring receiver 44.

In this embodiment, axial CL is used as a term indicating a direction. As shown in FIGS. 2 and 3, the axial CL is the extending direction of the movable shaft 42 and represents the central axis of the circuit breaker 100. The direction in which the fixed electrode 3 is arranged is on the upper side with respect to the movable portion 4, and the direction in which the operating mechanism 6 is arranged is on the lower side with respect to the movable portion 4.

As shown in FIG. 2, the movable portion 4 is movable in the axial CL of the movable shaft 42. The movable portion 4 is configured to be moved in the axial direction CL by the operating mechanism 6. The movable electrode 41 can be brought into contact with and separated from the fixed electrode 3. The movable electrode 41 is arranged in the internal space of the vacuum valve 5. The movable electrode 41 includes a movable electrode main body 411 and a movable side contact 412. The movable electrode main body 411 is connected to the movable side contact 412 and the movable shaft 42.

As shown in FIG. 2, the movable shaft 42 is connected to the movable electrode 41. The upper end of the movable shaft 42 is connected to the movable electrode 41 in the internal space of the vacuum valve 5. The lower end of the movable shaft 42 projects out of the vacuum valve 5. A movable side conductor 72 is connected to the lower end of the movable shaft 42. The movable conductor 72 includes a flexible conductor portion 721 and a lower conductor portion 722. The lower conductor portion 722 is connected to the movable shaft 42 by the flexible conductor portion 721. A guide pin 43 is provided at the lower end of the movable shaft 42. The guide pin 43 is provided with a movable side spring receiver 44.

<About the configuration of the fixed plate 1 and the movable plate 2>
Next, the configurations of the fixed plate 1 and the movable plate 2 according to the first embodiment will be described with reference to FIGS. 2 to 11. By energizing in the closed pole state, a magnetic attraction force is generated between the fixed plate 1 and the movable plate 2. Details of the magnetic attraction generated between the fixed plate 1 and the movable plate 2 will be described later.

As shown in FIGS. 2 and 3, the relative position of the fixing plate 1 with respect to the fixing electrode 3 is fixed. The fixing plate 1 is fixed to the vacuum valve 5. The fixed plate 1 is penetrated by the movable shaft 42.

As shown in FIG. 4, the fixed plate 1 includes a plurality of fixed-side first portions 11, a plurality of fixed-side second portions 12, and a fixed-side annular portion 13. Each of the plurality of fixed-side first portions 11 is integrally configured. The fixed-side annular portion 13 is integrally formed with each of the plurality of fixed-side first portions 11. The fixed-side annular portion 13 supports each of the plurality of fixed-side first portions 11.

As shown in FIG. 4, a through hole H1 is provided at the center of the fixed plate 1 so that the movable shaft 42 penetrates vertically. The movable shaft 42 can move along the axial direction CL while penetrating the fixed plate 1. The thickness of the axial CL of the fixed plate 1 is uniform. The fixing plate 1 is formed by punching, for example.

As shown in FIGS. 4 to 6, the fixed-side annular portion 13 is at least one of the fixed-side inner peripheral portion 131 (see FIGS. 4 and 6) and the fixed-side outer peripheral portion 132 (see FIGS. 5 and 6). have. As shown in FIGS. 4 and 6, the fixed-side inner peripheral portion 131 is provided on the inner peripheral circumference of the fixed plate 1. As shown in FIGS. 5 and 6, the fixed side outer peripheral portion 132 is provided on the outer periphery of the fixed plate 1. As shown in FIGS. 4 to 6, the fixed-side inner peripheral portion 131 and the fixed-side outer peripheral portion 132 are provided so as to surround the movable shaft 42 (see FIG. 7). The fixed-side annular portion 13 has a ring shape configured to surround the through hole H1.

As shown in FIG. 4, the fixed-side annular portion 13 may consist of only the fixed-side inner peripheral portion 131. As shown in FIG. 5, the fixed-side annular portion 13 may consist of only the fixed-side outer peripheral portion 132. As shown in FIG. 6, the fixed-side annular portion 13 may have both a fixed-side inner peripheral portion 131 and a fixed-side outer peripheral portion 132.

In this embodiment, as shown in FIG. 4, each of the plurality of fixed-side second portions 12 is a slit. Each of the plurality of fixed-side second portions 12 penetrates the fixed plate 1 in the axial CL (see FIG. 2). Each of the plurality of fixed-side second portions 12 extends in the radial direction of the fixed plate 1. As shown in FIGS. 5 and 6, each of the plurality of fixed-side second portions 12 may be through holes extending in the radial direction of the fixed plate 1. For example, four fixed-side second portions 12 are provided every 90 degrees from the center of the fixed plate 1. The number of the plurality of fixed-side second parts 12 may be appropriately determined.

As shown in FIGS. 7 and 8, the movable plate 2 faces the fixed plate 1 with a gap. The movable plate 2 can move together with the movable portion 4. FIG. 7 is a perspective view schematically showing the configuration of the movable portion 4, the fixed plate 1, and the movable plate 2 in the closed pole state according to the first embodiment. FIG. 8 is a perspective view schematically showing the configuration of the movable portion 4, the fixed plate 1, and the movable plate 2 in the open pole state according to the first embodiment. The movable plate 2 is fixed to the tip of the movable shaft 42.

As shown in FIG. 9, the movable plate 2 includes a plurality of movable side first portions 21, a plurality of movable side second portions 22, and a movable side annular portion 23. Each of the plurality of movable side first portions 21 is integrally configured. The movable side annular portion 23 is integrally formed with each of the plurality of movable side first portions 21. The movable side annular portion 23 supports each of the plurality of movable side first portions 21.

As shown in FIG. 9, a through hole H2 is provided at the center of the movable plate 2 so that the movable shaft 42 (see FIG. 2) penetrates vertically. The movable shaft 42 can move along the axial direction CL together with the movable plate 2 fixed to the tip of the movable shaft 42 in a state of penetrating the movable plate 2. The thickness of the axial CL of the movable plate 2 is uniform. The movable plate 2 is formed by punching, for example.

As shown in FIGS. 9 to 11, the movable side annular portion 23 is at least one of the movable side inner peripheral portion 231 (see FIGS. 9 and 11) and the movable side outer peripheral portion 232 (see FIGS. 10 and 11). have. As shown in FIGS. 9 and 11, the movable side inner peripheral portion 231 is provided on the inner circumference of the movable plate 2. As shown in FIGS. 10 and 11, the movable side outer peripheral portion 232 is provided on the outer periphery of the movable plate 2. As shown in FIGS. 9 to 11, the movable side outer peripheral portion 232 and the movable side inner peripheral portion 231 are provided so as to surround the movable shaft 42. The movable side annular portion 23 has a ring shape configured to surround the through hole H2.

As shown in FIG. 9, the movable side annular portion 23 may be composed of only the movable side inner peripheral portion 231. As shown in FIG. 10, the movable side annular portion 23 may be composed of only the movable side outer peripheral portion 232 as shown in FIG. As shown in FIG. 11, the movable side annular portion 23 may have both the movable side inner peripheral portion 231 and the movable side outer peripheral portion 232. The movable plate 2 may have the same shape as the fixed plate 1 (see FIGS. 4 to 6).

In the present embodiment, as shown in FIG. 9, each of the plurality of movable side second portions 22 is a slit. Each of the plurality of movable side second portions 22 penetrates the movable plate 2 in the axial direction CL. Each of the plurality of movable side second portions 22 extends in the radial direction of the movable plate 2. As shown in FIGS. 10 and 11, each of the plurality of movable side second portions 22 may be through holes extending in the radial direction of the movable plate 2. For example, four movable side second portions 22 are provided every 90 degrees from the center of the movable plate 2. The number of the plurality of movable side second parts 22 may be appropriately determined.

As shown in FIGS. 7 and 8, when viewed from the axial CL, each of the plurality of fixed-side first portions 11 overlaps with the plurality of movable-side second portions 22. Further, each of the plurality of movable side first portions 21 overlaps with the plurality of fixed side second portions 12. The fixed side second portion 12 is arranged at a position that does not overlap with the movable side second portion 22 in the axial direction CL.

The fixed plate 1 is a magnetic material. The movable plate 2 is a magnetic material. The material of the fixed plate 1 and the movable plate 2 is, for example, a soft magnetic material such as iron (Fe), silicon steel, or permalloy. The fixed plate 1 and the movable plate 2 are formed of, for example, an iron plate or an electromagnetic steel plate. The fixed plate 1 and the movable plate 2 are integrally formed of a magnetic material.

Each of the plurality of fixed-side second parts 12 has a lower magnetic permeance than each of the plurality of fixed-side first parts 11. Each of the plurality of movable side second portions 22 has a lower magnetic permeance than each of the plurality of movable side first portions 21.

Magnetic permeance indicates the ease with which magnetism can pass. Magnetic permeance is the reciprocal of reluctance. The higher the magnetic permeance, the lower the reluctance. The lower the magnetic permeability, the smaller the magnetic permeance. The fixed side first part 11 is easier for magnetism to pass through than the fixed side second part 12. The movable side first part 21 is easier for magnetism to pass through than the movable side second part 22. The fixed side second part 12 has a lower magnetic permeability than the fixed side first part 11. The movable side second part 22 has a lower magnetic permeability than the movable side first part 21.

In the present embodiment, as shown in FIGS. 4 and 9, the fixed side second part 12 and the movable side second part 22 are slits and are therefore filled with air. Air has a lower magnetic permeability than the fixed-side first part 11 and the movable-side first part 21, which are magnetic materials. Therefore, the fixed side second part 12 has a lower magnetic permeance than the fixed side first part 11, and the movable side second part 22 has a lower magnetic permeance than the movable side first part 21. ing.

In the present embodiment, as shown in FIGS. 7 and 8, each of the plurality of slits (fixed side second part 12) provided in the fixed plate 1 is with each of the plurality of movable side first parts 21. overlapping. Each of the plurality of slits (movable side second portion 22) provided in the movable plate 2 overlaps with each of the plurality of fixed side first portions 11.

In the present embodiment, as shown in FIGS. 4 and 9, even if the slit is configured so that the width of the slit in the circumferential direction is widened from the center of the fixed plate 1 or the movable plate 2 to the outer circumference. Good. Further, the width of the slit in the circumferential direction may be constant.

<About the configuration of the fixed electrode 3>
Next, the configuration of the fixed electrode 3 according to the first embodiment will be described with reference to FIGS. 2 and 3. The fixed electrode 3 is fixed to the vacuum valve 5. The fixed electrode 3 is provided on the opposite side of the movable shaft 42 with respect to the movable electrode 41. The fixed electrode 3 is arranged along the axial CL. The fixed electrode 3 includes a fixed-side main body 31 and a fixed-side contact 32. The fixed side contact 32 is arranged inside the vacuum valve 5. The lower end of the fixed body 31 is connected to the fixed contact 32. The upper end of the fixed-side main body 31 projects from the internal space of the vacuum valve 5 to the outside of the vacuum valve 5. The upper end of the fixed-side main body 31 is connected to the fixed-side conductor 71 outside the vacuum valve 5.

As shown in FIG. 2, the movable side contact 412 is in contact with the fixed side contact 32 in the closed pole state. In the closed pole state, the fixed side contact 32 and the movable side contact 412 are conducting. As shown in FIG. 3, in the open pole state, the fixed side contact 32 is separated from the movable side contact 412 with a distance (separation distance) at which the current can be cut off. In the open state of the circuit breaker 100, the fixed side contact 32 and the movable side contact 412 are not conducting with each other.

The circuit breaker 100 switches the open pole state to the closed pole state by bringing the movable electrode 41 and the fixed electrode 3 into contact with each other. The circuit breaker 100 switches the closed pole state to the open pole state by separating the movable electrode 41 and the fixed electrode 3.

<About the configuration of the vacuum valve 5>
Next, the configuration of the vacuum valve 5 according to the first embodiment will be described with reference to FIG. The vacuum valve 5 is airtight. The vacuum valve 5 includes a bellows 51, an insulating container 52, an upper flange 53, a lower flange 54, a sleeve 55 and a spacer 56. The internal space of the vacuum valve 5 is kept in vacuum by the bellows 51, the insulating container 52, the upper flange 53 and the lower flange 54.

As shown in FIG. 2, the insulating container 52 forms an internal space of the vacuum valve 5 together with the upper flange 53 and the lower flange 54. The upper flange 53 is attached to the upper side of the insulating container 52. The lower flange 54 is attached to the lower side of the insulating container 52. One end of the bellows 51 is attached to the movable portion 4. Specifically, the upper portion of the bellows 51 is fixed to the outer circumference of the movable portion 4. The bellows 51 is configured to be stretchable. Therefore, the airtightness of the vacuum valve 5 is maintained even when the bellows 51 is expanded and contracted by moving the movable portion 4 in the axial direction CL. The sleeve 55 is attached to the lower flange 54 while sandwiching the spacer 56 with the lower flange 54. A fixing plate 1 is fixed to the lower side of the sleeve 55.

<About the configuration of the operation mechanism 6>
Next, the configuration of the operation mechanism 6 according to the first embodiment will be described with reference to FIGS. 2 and 3. The operation mechanism 6 is configured to move the movable portion 4 in the axial direction CL by moving the operation shaft 60. The operation mechanism 6 in the present embodiment is an electromagnetic operation mechanism that moves the operation shaft 60 by an electromagnetic force. The operation mechanism 6 is not limited to the electromagnetic operation mechanism, and may be a mechanical operation mechanism composed of a cam, a link, a spring, or the like.

As shown in FIG. 2, the operating mechanism 6 includes an operating shaft 60, a base plate 61, an end plate 62, a permanent magnet 65, an electromagnetic coil 66, an operating spring 67, a pressure contact spring 68, and an operating mechanism. It includes a side spring receiver 69 and a fixed iron core 600.

As shown in FIG. 2, the operation shaft 60 is connected to the movable shaft 42 via a pressure contact spring 68. The operation shaft 60 is arranged so as to extend in the axial direction CL. A spring receiver 69 on the operation mechanism side is fitted to the operation shaft 60. The operation shaft 60 is arranged below the movable shaft 42.

The pressure contact spring 68 is inserted into the guide pin 43 and the operation shaft 60. Both ends of the pressure contact spring 68 are supported by the movable side spring receiver 44 and the operation mechanism side spring receiver 69. The pressure contact spring 68 is guided by a guide pin 43 so as not to deviate from the axial CL. The pressure contact spring 68 is arranged between the movable side spring receiver 44 and the operation side spring receiver 69 to connect the movable shaft 42 and the operation shaft 60. The pressure contact spring 68 is compressed by the movable shaft 42 and the operating shaft 60. Since the operating shaft 60 is connected to the movable shaft 42 by the pressure contact spring 68, the movable shaft 42 is moved by the operating shaft 60.

The base plate 61 penetrates the operation shaft 60. The position of the base plate 61 is fixed, and the electromagnetic coil 66, the operation spring 67, and the fixed iron core 600 are connected to the lower side of the base plate 61. The base plate 61 is a magnetic material.

The operation spring 67 is arranged on the side opposite to the movable shaft 42 with respect to the base plate 61. The operation spring 67 is inserted into the operation shaft 60. The operating spring 67 is compressed by the base plate 61 and the end plate 62.

As shown in FIG. 2, the fixed iron core 600 is connected to the base plate 61 between the base plate 61 and the end plate 62. The fixed iron core 600 has a tubular shape that surrounds the operation shaft 60 and the operation spring 67. The upper end of the fixed iron core 600 is fixed to the base plate 61. In the closed pole state, the lower end of the fixed iron core 600 and the permanent magnet 65 support the end plate 62. The fixed core 600 includes a first fixed core portion 63 and a second fixed core portion 64. An electromagnetic coil 66 is arranged between the first fixed iron core portion 63 and the second fixed iron core portion 64. The electromagnetic coil 66 is arranged adjacent to the fixed iron core 600.

As shown in FIG. 2, the permanent magnet 65 is arranged between the fixed iron core 600 and the end plate 62. The permanent magnet 65 is fixed to the lower end of the second fixed iron core portion 64. In the closed pole state, the end plate 62 is in contact with the first fixed iron core portion 63 and the permanent magnet 65. As shown in FIG. 3, in the open pole state, the end plate 62 is separated from the first fixed iron core portion 63 and the permanent magnet 65.

As shown in FIG. 2, the end plate 62 is fixed to the tip of the operating shaft 60 and sandwiches the operating spring 67 together with the base plate 61. The end plate 62 is configured to be moved in the axial CL together with the operation shaft 60. The end plate 62 is arranged below the electromagnetic coil 66, the operating spring 67, and the fixed iron core 600. The end plate 62 is connected to the base plate 61 by an operating spring 67. The end plate 62 is a magnetic material. In the closed pole state, a closed loop magnetic circuit is formed by the base plate 61, the end plate 62, the first fixed iron core portion 63, the second fixed iron core portion 64, and the permanent magnet 65, and the end plate 62 is attracted.

As shown in FIG. 3, in the open pole state, the end plate 62 is pushed downward by the operating spring 67 to be separated from the first fixed iron core portion 63 and the permanent magnet 65. When the end plate 62 is separated from the first fixed iron core portion 63 and the permanent magnet 65 by the operating spring 67, the operating shaft 60 moves downward, and the fixed electrode 3 and the movable electrode 41 are separated from each other to be in an open pole state. .. In the open pole state, the distance between the end plate 62 and the permanent magnet 65 is larger than the distance (separation distance) between the fixed side contact 32 and the movable side contact 412.

<Magnetic attraction generated between the fixed plate 1 and the movable plate 2>
Next, the magnetic attraction force generated between the fixed plate 1 and the movable plate 2 in the closed pole state of the circuit breaker 100 according to the first embodiment will be described mainly with reference to FIGS. 12 to 13. FIG. 12 is a cross-sectional view schematically showing the configuration of the movable portion 4, the fixed plate 1, and the movable plate 2 in the closed pole state according to the first embodiment. The fixed plate 1 and the movable plate 2 are arranged so that a magnetic attraction force is generated between the fixed plate 1 and the movable plate 2 through a gap when the fixed electrode 3 and the movable electrode 41 are in contact with each other. In the open pole state, no magnetic attraction is generated between the fixed plate 1 and the movable plate 2.

As shown in FIG. 12, in the closed pole state of the present embodiment, a gap is provided between the fixed plate 1 and the movable plate 2. The gap provided between the fixed plate 1 and the movable plate 2 is called an air gap.

As shown in FIG. 12, the dimensions of the air gap D1a in the axial CL in the closed pole state are uniform. The dimension of the air gap D1a in the axial direction CL in the closed pole state is the distance at which a magnetic attraction force is generated between the fixed plate 1 and the movable plate 2. In the present embodiment, in the closed pole state, the dimensions of the air gap D1a are the circumferences of the movable shafts 42 of the fixed side second part 12 (see FIG. 4) and the movable side second part 22 (see FIG. 9). Less than the smallest dimension in the direction. As shown in FIG. 13, the size of the air gap D1b in the open pole state of the present embodiment is larger than the size of the air gap D1a (see FIG. 12) in the closed pole state.

In the open pole state, the air gap D1b (see FIG. 13) in the open pole state is the air in the closed pole state by at least the distance (separation distance) between the fixed side contact 32 and the movable side contact 412 shown in FIG. It is larger than the gap D1a (see FIG. 12).

In the closed pole state, the movable shaft 42 shown in FIG. 7 is energized, so that a current flows through the movable shaft 42. When an electric current flows through the movable shaft 42, a magnetic field is generated around the movable shaft 42. As a result, magnetic flux is generated in the circumferential direction in the fixed plate 1 and the movable plate 2 which are magnetic materials.

The magnetic flux is divided in the circumferential direction by the slits (fixed side second part 12 and movable side second part 22). The magnetic flux passing through the fixed side first part 11 is divided by the fixed side second part 12, and the magnetic flux passing through the movable side first part 21 is divided by the movable side second part 22. Since the dimension of the air gap D1a in which the fixed side first portion 11 and the movable side first portion 21 overlap in the axial direction is narrower than the dimension in the circumferential direction of the slit, the magnetic flux passes through the air gap D1a. That is, the magnetic flux is generated in the axial CL between the fixed plate 1 and the movable plate 2, and a magnetic gap is formed. Therefore, an axial CL magnetic attraction force is generated between the fixed plate 1 and the movable plate 2. The smaller the dimension of the air gap D1a in the closed pole state, the larger the magnetic flux generated between the fixed plate 1 and the movable plate 2, and therefore the larger the magnetic attraction force.

Due to the magnetic attraction force, a force is generated in the movable plate 2 shown in FIG. 12 in the direction (upward direction) from the movable plate 2 toward the fixed plate 1. As a result, the movable plate 2 is urged upward, so that the movable plate 2 is moved upward. Further, since the movable portion 4 can be moved together with the movable plate 2 , the movable portion 4 is moved upward. As a result, the movable electrode 41 is pressed against the fixed electrode 3. Further, a force is generated in the fixed plate 1 in the direction (downward) from the fixed plate 1 toward the movable plate 2, but since the fixed plate 1 is fixed to the vacuum valve 5, the fixed plate 1 does not move.

<About the operation of the operation mechanism 6 when switching between the closed pole state and the open pole state of the circuit breaker 100>
Next, the operation of the operation mechanism 6 in switching between the closed pole state and the open pole state of the circuit breaker 100 according to the first embodiment will be described with reference to FIGS. 14 and 15. The white arrows shown in FIGS. 14 and 15 are the forces generated by the operating mechanism 6 or the fixed plate 1 and the movable plate 2 on the circuit breaker 100.

By moving the movable shaft 42 connected to the operation shaft 60 in the axial direction CL, the closed pole state and the open pole state of the circuit breaker 100 can be switched. The closing operation for switching from the open state to the closed state is performed by the operating mechanism 6 moving the movable shaft 42 upward so that the movable electrode 41 is in contact with the fixed electrode 3. The opening operation for switching from the closed state to the open state is performed by the operating mechanism 6 moving the movable shaft 42 downward so that the movable electrode 41 is separated from the fixed electrode 3. Specifically, the operation mechanism 6 uses the electromagnetic force of the electromagnetic coil 66 or the like, the magnetic attraction force of the permanent magnet 65, the restoration force of the pressure contact spring 68, and the restoration force of the operation spring 67 to operate the operation shaft. The 60 and the movable shaft 42 connected to the operation shaft 60 are moved in the axial CL.

First, the force generated in the circuit breaker 100 in the closed pole state and the open pole state will be explained, and then the operation of the operation mechanism 6 in the switching from the closed pole state to the open pole state and the switching from the open pole state to the closed pole state will be described. explain.

As shown in FIG. 14, in the closed pole state, an upward force is generated on the movable plate 2 by the magnetic attraction force of the fixed plate 1 and the movable plate 2.

As shown in FIGS. 14 and 15, in the closed pole state and the open pole state, a downward force is generated on the operation shaft 60 by the restoring force of the pressure contact spring 68. In the closed and open states, a downward force is generated on the end plate 62 by the restoring force of the operating spring 67. As shown in FIG. 14, in the closed pole state, an upward force is generated on the end plate 62 by the electromagnetic force of the electromagnetic coil 66 and the like and the magnetic attraction force of the permanent magnet 65.

In the closed pole state, the upward force generated by the electromagnetic force of the electromagnetic coil 66 or the like and the magnetic attraction force of the permanent magnet 65 is larger than the downward force generated by the restoring force of the pressure contact spring 68 and the restoring force of the operating spring 67. large. Therefore, in the closed pole state, an upward force is generated on the operation shaft 60. Therefore, an upward force is generated on the movable shaft 42. On the other hand, as shown in FIG. 15, in the open pole state, a downward force is generated on the operation shaft 60 and the end plate 62, so that a downward force is generated on the movable shaft 42.

The electromagnetic force of the electromagnetic coil 66 or the like is generated by the following process. First, a current is passed through the electromagnetic coil 66 of the operating mechanism 6 shown in FIG. As a result, a magnetic field is generated around the electromagnetic coil 66, so that magnetic flux is generated in the base plate 61, the permanent magnet 65, and the fixed iron core 600. Therefore, since the base plate 61, the permanent magnet 65, and the fixed iron core 600 function integrally as an electromagnet, an electromagnetic force is generated in the base plate 61, the permanent magnet 65, and the fixed iron core 600. The electromagnetic force of the electromagnetic coil 66 or the like attracts the end plate 62 upward. Therefore, an upward force due to an electromagnetic force such as an electromagnetic coil 66 is generated on the operation shaft 60 fixed to the end plate 62. The electromagnetic force of the electromagnetic coil 66 and the like is larger than the restoring force of the operating spring 67. As shown in FIG. 15, since no current is passed through the electromagnetic coil 66 in the open pole state, no electromagnetic force such as the electromagnetic coil 66 is generated.

As shown in FIG. 14, in the closed pole state, the permanent magnet 65 attracts the end plate 62 by the magnetic attraction force of the permanent magnet 65. Therefore, an upward force is generated on the operation shaft 60 fixed to the end plate 62 due to the magnetic attraction force of the permanent magnet 65. As shown in FIG. 15, since the permanent magnet 65 is separated from the end plate 62 in the open pole state, the permanent magnet 65 does not attract the end plate 62.

As shown in FIG. 14, since the pressure contact spring 68 is compressed in the closed pole state, the pressure contact spring 68 has a restoring force. Due to the restoring force of the pressure contact spring 68, an upward force is generated on the movable shaft 42. Further, the restoring force of the pressure contact spring 68 generates a downward force on the operation shaft 60. As the operating shaft 60 moves upward, the pressure contact spring 68 is compressed, so that the upward force generated on the movable shaft 42 and the downward force generated on the operating shaft 60 increase.

As shown in FIG. 14, since the operating spring 67 is compressed in the closed pole state, the operating spring 67 has a restoring force. The restoring force of the operating spring 67 creates an upward force on the base plate 61. Further, the restoring force of the operating spring 67 generates a downward force on the end plate 62 and the operating shaft 60.

Further, in the closing operation, if the pressure contact spring 68 can be further compressed, the operation shaft 60 is further moved upward. As a result, the pressure contact spring 68 is further compressed after the movable electrode 41 comes into contact with the fixed electrode 3. Since the restoring force of the pressure contact spring 68 exerts an upward force on the movable shaft 42, the movable electrode 41 is pressed against the fixed electrode 3. Therefore, the closed pole state is maintained.

As shown in FIG. 14, an electromagnetic repulsive force is generated between the fixed electrode 3 and the movable electrode 41 by energizing in the closed electrode state. As a result, the fixed electrode 3 and the movable electrode 41 are about to be separated from each other. Therefore, in order to maintain the closed pole state, the fixed electrode 3 and the movable electrode 41 need to be pressed by a force stronger than the electromagnetic repulsive force.

Subsequently, the operation of the operation mechanism 6 in switching from the open pole state to the closed pole state will be described. By the following process, the circuit breaker 100 is switched from the open pole state shown in FIG. 15 to the closed pole state shown in FIG.

First, in the open pole state shown in FIG. 15, a current is passed through the electromagnetic coil 66 of the operating mechanism 6. As a result, a magnetic field is generated around the electromagnetic coil 66, and a magnetic flux passing through the first fixed iron core portion 63, the base plate 61, the second fixed iron core portion 64, and the permanent magnet 65 is generated. The electromagnet formed by this magnetic circuit attracts the end plate 62 upward, and the operating shaft 60 is moved upward together with the end plate 62. Therefore, the movable shaft 42 is moved upward.

Subsequently, the operation shaft 60 is moved upward, so that the permanent magnet 65 approaches the end plate 62. Since the operating shaft 60 is attracted upward together with the end plate 62 by the magnetic attraction force of the electromagnet and the permanent magnet 65, the operating shaft 60 is further moved upward. Therefore, the movable shaft 42 is further moved upward. Eventually, as shown in FIG. 14, the permanent magnet 65 comes into contact with the end plate 62. Further, since an upward force is generated on the movable shaft 42 by the restoring force of the pressure contact spring 68 and the restoring force of the operating spring 67, the movable shaft 42 is further moved upward. As described above, the movable electrode 41 comes into contact with the fixed electrode 3 to switch from the open electrode state to the closed electrode state.

Subsequently, the operation of the operation mechanism 6 in switching from the closed pole state to the open pole state will be described.

First, in the closed pole state shown in FIG. 14, the current flowing through the electromagnetic coil 66 of the operating mechanism 6 is cut off. As a result, the upward force generated on the operating shaft 60 by the electromagnetic force of the electromagnet disappears, so that the operating shaft 60 moves downward together with the end plate 62. Therefore, the movable shaft 42 is moved downward. Also, as shown in FIG. 15, the end plate 62 separates from the permanent magnet 65. Subsequently, the upward force generated on the operation shaft 60 due to the magnetic attraction force of the permanent magnet 65 disappears. Therefore, the operation shaft 60 is further moved downward. Therefore, the movable shaft 42 is further moved downward. As described above, the movable electrode 41 is switched from the closed electrode state to the open electrode state by moving away from the fixed electrode 3.

<About action and effect>
According to the circuit breaker 100 in the present embodiment, as shown in FIGS. 4 and 9, a plurality of fixed-side first parts 11 and a plurality of movable-side first parts 21 are integrally configured. Therefore, the positions of the axial CLs of the fixed plate 1 and the movable plate 2 can be made uniform. Therefore, the axial dimension of the gap (air gap D1a) (see FIG. 12) between the fixed plate 1 and the movable plate 2 can be made uniform.

Since the axial dimension of the gap (air gap D1a) (see FIG. 12) between the fixed plate 1 and the movable plate 2 can be made uniform, the magnitude of the magnetic attraction generated between the fixed plate 1 and the movable plate 2 can be increased. Can be made uniform. Therefore, the magnetic attraction generated between the fixed plate 1 and the movable plate 2 is stable. Therefore, the closed state of the circuit breaker 100 can be stably maintained.

As shown in FIGS. 4 and 9, since each of the plurality of fixed-side first portions 11 and each of the plurality of movable-side first portions 21 are integrally configured, the fixed plate 1 and the movable plate 2 Each can be manufactured as a unit. Therefore, in the manufacture of the circuit breaker 100, the fixed plate 1 and the movable plate 2 can be manufactured by punching or the like. Further, in the manufacture of the circuit breaker 100, the fixed plate 1 and the movable plate 2 can be easily handled and assembled. Further, since the shapes of the fixed plate 1 and the movable plate 2 may be the same, the fixed plate 1 and the movable plate 2 can be manufactured by the same member. Therefore, the manufacturing cost of the circuit breaker 100 can be reduced.

As shown in FIG. 14, since a magnetic attraction force is generated between the fixed plate 1 and the movable plate 2 in the closed pole state, the fixed plate 1 and the movable plate 2 can maintain the closed pole state of the circuit breaker 100. it can. As a result, the fixed plate 1 and the movable plate 2 can assist the holding force of the operating mechanism 6 for maintaining the closed pole state of the circuit breaker 100. Therefore, the holding force for the operating mechanism 6 to maintain the closed pole state of the circuit breaker 100 may be small. Therefore, since the size of the operation mechanism 6 can be reduced, the size of the circuit breaker 100 can be reduced. Further, since the permanent magnet 65 of the operation mechanism 6 can be made smaller, the manufacturing cost of the circuit breaker 100 can be reduced.

In the closed pole state, the movable shaft 42 is energized, so that magnetic attraction is generated in the fixed plate 1 and the movable plate 2, while in the open pole state, the movable shaft 42 is not energized, so no magnetic attraction is generated. Therefore, the magnetic attraction force is generated in conjunction with the switching from the open pole state to the closed pole state of the circuit breaker 100. Therefore, it is not necessary to provide additional equipment to generate the magnetic attraction. Therefore, the manufacturing cost of the circuit breaker 100 can be reduced.

According to the circuit breaker 100 of the present embodiment, as shown in FIGS. 4 and 9, since the fixed plate 1 has the fixed side annular portion 13, the rigidity of the fixed plate 1 is determined by the fixed plate 1. It is higher than the case where the fixed side annular portion 13 is not provided. Since the movable plate 2 has the movable side annular portion 23, the rigidity of the movable plate 2 is higher than that in the case where the movable plate 2 does not have the movable side annular portion 23. As a result, deformation of the fixed plate 1 and the movable plate 2 can be suppressed, so that the dimensions of the air gap D1a (see FIG. 12) can be made uniform.

As shown in FIG. 4, since the fixed plate 1 has the fixed side inner peripheral portion 131, the rigidity of the inner peripheral portion of the fixed plate 1 is such that the fixed plate 1 has the fixed side inner peripheral portion 131. Higher than if not. Further, as shown in FIG. 9, since the movable plate 2 has the movable side inner peripheral portion 231, the rigidity of the inner peripheral portion of the movable plate 2 is such that the movable plate 2 has the movable side inner peripheral portion 231. Higher than if not. Therefore, the deformation of the fixed plate 1 and the movable plate 2 can be suppressed.

As shown in FIG. 5, since the fixed plate 1 has the fixed side outer peripheral portion 132, the rigidity of the outer peripheral portion of the fixed plate 1 is higher than that when the fixed plate 1 does not have the fixed side outer peripheral portion 132. Also expensive. Further, as shown in FIG. 10, since the movable plate 2 has the movable side outer peripheral portion 232, the rigidity of the outer peripheral portion of the movable plate 2 is such that the movable plate 2 does not have the movable side outer peripheral portion 232. Higher than the case. Therefore, the deformation of the fixed plate 1 and the movable plate 2 can be suppressed.

As shown in FIG. 6, since the fixed plate 1 has both the fixed side inner peripheral portion 131 and the fixed side outer peripheral portion 132, the rigidity of the fixed plate 1 is such that the fixed plate 1 has the fixed side inner peripheral portion 131. And higher than the case of having only one of the fixed side outer peripheral portions 132. As shown in FIG. 6, since the movable plate 2 has both the movable side inner peripheral portion 231 and the movable side outer peripheral portion 232, the rigidity of the movable plate 2 is such that the movable plate 2 has the movable side inner peripheral portion 231. And higher than the case of having only one of the movable side outer peripheral portions 232. Therefore, the deformation of the fixed plate 1 and the movable plate 2 is suppressed. Further, since the fixed plate 1 and the movable plate 2 have high rigidity, the thickness of the axial CL of the fixed plate 1 and the movable plate 2 can be reduced. Therefore, since the materials for the fixed plate 1 and the movable plate 2 can be reduced, the manufacturing cost of the circuit breaker 100 can be reduced. Further, since the fixing plate 1 and the movable plate 2 are thin, the punching process becomes easy. Therefore, since the processing time is shortened, the manufacturing cost of the circuit breaker 100 can be reduced. The thickness of the fixed plate 1 and the movable plate 2 may be reduced to a thickness that does not cause magnetic saturation.

According to the circuit breaker 100 in the present embodiment, as shown in FIG. 4, since the fixed side second portion 12 is a slit, the fixed plate 1 is axially penetrated in the fixed side second portion 12. .. Further, as shown in FIG. 9, since the movable side second portion 22 is a slit, the movable plate 2 is penetrated in the movable side second portion 22 in the axial direction. Therefore, the magnetic permeance of the fixed side second part 12 and the movable side second part 22 is lower than that when the material of the fixed side second part 12 and the movable side second part 22 is a magnetic material. Therefore, the magnetic attraction generated between the fixed plate 1 and the movable plate 2 is larger than that in the case where the fixed plate 1 and the movable plate 2 are not penetrated.

According to the circuit breaker 100 in the present embodiment, as shown in FIG. 2, when the fixed electrode 3 and the movable electrode 41 come into contact with each other, the operating shaft 60 moves so that the permanent magnet 65 comes into contact with the end plate 62. To do. Further, when the fixed electrode 3 and the movable electrode 41 are separated from each other, the operating shaft 60 is moved so that the end plate 62 is separated from the permanent magnet 65 by the operating spring 67. This simplifies the configuration of the operating mechanism 6, so that the dimensions of the operating mechanism 6 can be reduced.

Embodiment 2.
The configuration of the circuit breaker 100 according to the second embodiment will be described with reference to FIGS. 16 to 21. Unless otherwise specified, the second embodiment has the same configuration and effects as those of the first embodiment. Therefore, the same components as those in the first embodiment are designated by the same reference numerals, and the description will not be repeated.

In the present embodiment, as shown in FIG. 16, each of the plurality of fixed-side second portions 12 has a thinner axial CL than each of the plurality of fixed-side first portions 11. As shown in FIG. 17, each of the plurality of movable side second portions 22 has a thinner axial CL than each of the plurality of movable side first portions 21. As shown in FIG. 18, the circuit breaker 100 of the present embodiment is implemented in that the fixed side second portion 12 of the fixed plate 1 and the movable side second portion 22 of the movable plate 2 have a thickness. It is different from the circuit breaker 100 (see FIG. 2) of the first embodiment.

As shown in FIGS. 16 and 17, the fixed plate 1 and the movable plate 2 are disk-shaped in top view. The fixed side second part 12 and the movable side second part 22 are not penetrated in the axial CL. Each of the plurality of fixed-side second portions 12 is, for example, a groove extending in the radial direction of the fixed plate 1. Each of the plurality of movable side second portions 22 is, for example, a groove extending in the radial direction of the movable plate 2. As shown in FIGS. 18 and 19, each of the fixed plate 1 and the movable plate 2 has a thickness in the axial CL as a whole.

In the closed pole state of the present embodiment, the dimension of the gap (air gap) D2a between the movable side first part 21 and the fixed side first part 11 shown in FIG. 20 in the axial direction CL is the magnetic attraction force. The distance that occurs. As shown in FIG. 21, the air gap D2b in the open pole state is larger than the air gap D2a in the closed pole state (see FIG. 20).

As shown in FIG. 20, since the fixed side second part 12 and the movable side second part 22 have a thickness, the fixed side second part 12 and the movable side second part 22 also have magnetic flux in the closed pole state. Occurs. Therefore, the amount of magnetic flux generated in the air gap D2a is smaller than the amount of magnetic flux in the first embodiment. Therefore, the magnetic attraction generated between the fixed plate 1 and the movable plate 2 is smaller than that in the case where the fixed side second portion 12 and the movable side second portion 22 are slits. Therefore, for example, it is preferable to increase the magnetic attraction force by making the size of the air gap D2a smaller than that of the air gap D1a (see FIG. 12) in the first embodiment. Further, the magnetic attraction force may be increased by reducing the thickness of the axial CL of the fixed side second portion 12 and the movable side second portion 22. Further, the magnetic attraction force may be increased by increasing the radial dimensions of the fixed plate 1 and the movable plate 2.

<About action and effect>
According to the circuit breaker 100 in the present embodiment, as shown in FIG. 20, each of the plurality of fixed-side second portions 12 has a thickness of the axial CL more than that of each of the plurality of fixed-side first portions 11. thin. Further, each of the plurality of movable side second portions 22 has a thinner axial CL than each of the plurality of movable side first portions 21. Therefore, since each of the plurality of fixed-side second portions 12 and each of the plurality of movable-side second portions 22 have a thickness, the rigidity of the fixed plate 1 and the movable plate 2 is such that the plurality of fixed-side second portions 22 are rigid. It is higher than when each of the twelve and each of the plurality of movable side second portions 22 has no thickness. Therefore, the deformation of the fixed plate 1 and the movable plate 2 can be suppressed.

Embodiment 3.
Next, the configuration of the circuit breaker 100 according to the third embodiment will be described with reference to FIGS. 22 to 27. Unless otherwise specified, the third embodiment has the same configuration and effects as those of the first embodiment. Therefore, the same components as those in the first embodiment are designated by the same reference numerals, and the description will not be repeated.

In the present embodiment, as shown in FIG. 22, each of the plurality of fixed-side first portions 11 has a fixed-side slope 15. Each of the plurality of movable side first portions 21 has a movable side slope 25. The fixed-side slope 15 faces the movable-side slope 25 in the axial direction CL.

As shown in FIGS. 22 and 23, the fixed side slope 15 faces the movable plate 2. The movable side slope 25 faces the fixed plate 1. As shown in FIGS. 24 and 25, the fixed plate 1 overlaps the movable plate 2 in the axial CL. Further, the fixed plate 1 is embedded in the movable plate 2.

As shown in FIG. 26, the fixed-side slope 15 has a fixed-side first slope 151 and a fixed-side second slope 152. The fixed-side first slope 151 and the fixed-side second slope 152 are arranged on both sides of the fixed-side first portion 11 in the circumferential direction. The fixed-side first slope 151 and the fixed-side second slope 152 are configured so that the distance between them increases toward the upper side of the axial CL.

The angle formed by the fixed-side first slope 151 with the upper surface of the fixed-side first portion 11 is the same as the angle formed by the fixed-side second slope 152 with the upper surface of the fixed-side first portion 11. The angle formed by the fixed-side first slope 151 with the upper surface of the fixed-side first portion 11 is an acute angle. The angle formed by the fixed-side first slope 151 with the upper surface of the fixed-side first portion 11 is, for example, 45 degrees. The angle formed by the fixed-side second slope 152 with the upper surface of the fixed-side first portion 11 is an acute angle. The angle formed by the fixed-side second slope 152 with the upper surface of the fixed-side first portion 11 is, for example, 45 degrees.

As shown in FIG. 27, the movable side slope 25 has a movable side first slope 251 and a movable side second slope 252. The movable side first slope 251 and the movable side second slope 252 are arranged on both sides of the movable side first portion 21 in the circumferential direction. The movable side first slope 251 and the movable side second slope 252 are configured so that the distance between them increases toward the lower side of the axial CL.

The angle formed by the movable side first slope 251 with the lower surface of the movable side first portion 21 is the same as the angle formed by the movable side second slope 252 with the lower surface of the movable side first portion 21. The angle formed by the movable side first slope 251 with the lower surface of the movable side first portion 21 is an acute angle. The angle formed by the movable side first slope 251 with the lower surface of the movable side first portion 21 is, for example, 45 degrees. The angle formed by the movable side second slope 252 with the lower surface of the movable side first portion 21 is an acute angle. The angle formed by the movable side second slope 252 with the lower surface of the movable side first portion 21 is, for example, 45 degrees.

The movable side first slope 251 faces the fixed side first slope 151 in the axial direction CL. The movable side second slope 252 faces the fixed side second slope 152 in the axial direction CL.

As shown in FIG. 23, the area of the lower surface of each of the plurality of fixed-side first portions 11 is smaller than the area of the upper surface of each of the plurality of fixed-side first portions 11. The area of the upper surface of each of the plurality of movable side first portions 21 is smaller than the area of the lower surface of each of the plurality of movable side first portions 21.

As shown in FIG. 22, since the fixed plate 1 and the movable plate 2 are obliquely opposed to the axial CL, the gap (air gap) D3a between the fixed plate 1 and the movable plate 2 is set to the axial CL. On the other hand, it is provided diagonally. Therefore, the magnetic attraction generated between the fixed plate 1 and the movable plate 2 is generated obliquely with respect to the axial CL. Further, as shown in FIG. 23, the air gap D3b is provided obliquely with respect to the axial CL even in the open pole state.

In the present embodiment, since the magnetic attraction force is generated obliquely with respect to the axial CL, it includes an axial CL component along the axial CL and a radial component along the radial direction. As shown in FIG. 26, since the fixed-side first slope 151 is configured to have a large distance to the fixed-side second slope 152, the radial component of the magnetic attraction force generated on the fixed-side second slope 152 is large. Is oriented in the direction opposite to the radial component of the magnetic attraction force generated on the first slope 151 on the fixed side in the radial direction. Therefore, the radial component of the magnetic attraction force is canceled as a whole. Therefore, only the axial CL force is generated on the movable plate 2.

<About action and effect>
According to the circuit breaker 100 in the present embodiment, as shown in FIGS. 24 and 25, since the fixed side slope 15 faces the movable side slope 25, the movable plate 2 has entered the fixed plate 1. As a result, the thickness of the fixed plate 1 and the movable plate 2 can be increased, so that the rigidity of the fixed plate 1 and the movable plate 2 can be increased.

Embodiment 4.
Next, the configuration of the circuit breaker 100 according to the fourth embodiment will be described with reference to FIGS. 28 to 32. Unless otherwise specified, the fourth embodiment has the same configuration and effects as those of the first embodiment. Therefore, the same components as those in the first embodiment are designated by the same reference numerals, and the description will not be repeated.

As shown in FIG. 28, in this embodiment, the circuit breaker 100 further includes a fixed side support plate 14 and a movable side support plate 24. The circuit breaker 100 of the present embodiment is different from the circuit breaker 100 of the first embodiment in that the fixed side support plate 14 and the movable side support plate 24 are further included.

As shown in FIG. 28, the fixed-side support plate 14 is fixed to the fixed-side first portion 11 and the sleeve 55 of the vacuum valve 5. The movable side support plate 24 is fixed to the movable side first portion 21 and the movable shaft 42.

As shown in FIGS. 29 and 30, the fixed side support plate 14 is arranged on the opposite side of the fixed plate 1 with respect to the movable plate 2. The fixed side support plate 14 supports the fixed plate 1. The movable side support plate 24 is arranged on the opposite side of the movable plate 2 with respect to the fixed plate 1. The movable side support plate 24 supports the movable plate 2. The fixed side support plate 14 and the movable side support plate 24 are non-magnetic materials. As shown in FIGS. 29 and 31, the movable side support plate 24 and the fixed side support plate 14 have a disk shape.

Since the fixed side support plate 14 and the movable side support plate 24 are non-magnetic materials, the fixed side support plate 14 and the movable side support plate 24 affect the magnetic attraction generated between the fixed plate 1 and the movable plate 2. Do not give. Therefore, the dimensions of the air gap D4a in the closed pole state shown in FIG. 30 may be the same as the air gap D1a in the closed pole state of the first embodiment shown in FIG. Further, the dimensions of the air gap D4b in the open pole state shown in FIG. 32 may be the same as the air gap D1b in the open pole state of the first embodiment shown in FIG.

<About action and effect>
According to the circuit breaker 100 in the present embodiment, since the fixed side support plate 14 supports the fixed plate 1, the rigidity of the fixed plate 1 is when the fixed side support plate 14 does not support the fixed plate 1. Higher than. Further, since the movable side support plate 24 supports the movable plate 2, the rigidity of the movable plate 2 is higher than that when the movable side support plate 24 does not support the movable plate 2. As a result, deformation of the fixed plate 1 and the movable plate 2 can be suppressed.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the claims.

1 Fixed plate, 2 Movable plate, 3 Fixed electrode, 4 Movable part, 6 Operation mechanism, 11 Fixed side 1st part, 12 Fixed side 2nd part, 13 Fixed side annular part, 14 Fixed side support plate, 15 Fixed side tilt Surface, 21 Movable side 1st part, 22 Movable side 2nd part, 23 Movable side annular part, 24 Movable side support plate, 25 Movable side inclined surface, 41 Movable electrode, 42 Movable shaft, 60 Operating shaft, 61 Base plate, 62 End plate, 65 Permanent magnet, 66 Electromagnetic coil, 67 Operation spring, 131 Fixed side inner circumference, 132 Fixed side outer circumference, 231 Movable side inner circumference, 232 Movable side outer circumference, 600 Fixed iron core, CL axial direction.

Claims (7)

With fixed electrodes
A movable portion that includes a movable electrode that can be brought into contact with and detached from the fixed electrode, a movable shaft that is connected to the movable electrode, and that can move in the axial direction of the movable shaft.
A fixed plate whose relative position to the fixed electrode is fixed and is a magnetic material,
It is provided with a movable plate that faces the fixed plate with a gap, is movable together with the movable portion, and is a magnetic material.
The fixed plate and the movable plate are arranged so that a magnetic attraction force is generated between the fixed plate and the movable plate through the gap when the fixed electrode and the movable electrode come into contact with each other. ,
The fixation plate comprises a plurality of fixation-side first portions and a plurality of fixation-side second portions having a lower magnetic permeance than the plurality of fixation-side first portions.
The movable plate includes a plurality of movable side first parts and a plurality of movable side second parts having a lower magnetic permeance than the plurality of movable side first parts.
When viewed from the axial direction, each of the plurality of fixed-side first parts overlaps with each of the plurality of movable-side second parts, and each of the plurality of movable-side first parts is fixed. Overlapping with each of the second part of the side,
The fixing plate includes a fixed-side annular portion that is integrally formed with each of the plurality of fixed-side first portions.
The movable plate includes a movable side annular portion integrally formed with each of the plurality of movable side first portions.
The plurality of fixed-side first portions and the fixed-side annular portions are magnetic materials.
A circuit breaker characterized in that the plurality of movable-side first portions and the movable-side annular portions are magnetic materials. The fixed-side annular portion has at least one of a fixed-side inner peripheral portion provided on the inner circumference of the fixed plate and a fixed-side outer peripheral portion provided on the outer circumference of the fixed plate.
The movable-side annular portion has at least one of a movable-side inner peripheral portion provided on the inner circumference of the movable plate and a movable-side outer peripheral portion provided on the outer circumference of the movable plate.
The circuit breaker according to claim 1, wherein the fixed-side inner peripheral portion, the fixed-side outer peripheral portion, the movable-side inner peripheral portion, and the movable-side outer peripheral portion are provided so as to surround the movable shaft. Each of the plurality of fixed-side second parts is a slit.
The circuit breaker according to claim 1 or 2, wherein each of the plurality of movable side second parts is a slit. With fixed electrodes
A movable portion that includes a movable electrode that can be brought into contact with and detached from the fixed electrode, a movable shaft that is connected to the movable electrode, and that can move in the axial direction of the movable shaft.
A fixed plate whose relative position to the fixed electrode is fixed and is a magnetic material,
It is provided with a movable plate that faces the fixed plate with a gap, is movable together with the movable portion, and is a magnetic material.
The fixed plate and the movable plate are arranged so that a magnetic attraction force is generated between the fixed plate and the movable plate through the gap when the fixed electrode and the movable electrode come into contact with each other. ,
The fixation plate comprises a plurality of fixation-side first portions and a plurality of fixation-side second portions having a lower magnetic permeance than the plurality of fixation-side first portions.
The movable plate includes a plurality of movable side first parts and a plurality of movable side second parts having a lower magnetic permeance than the plurality of movable side first parts.
When viewed from the axial direction, each of the plurality of fixed-side first parts overlaps with each of the plurality of movable-side second parts, and each of the plurality of movable-side first parts is fixed. Overlapping with each of the second part of the side,
Each of the plurality of fixed-side first parts is integrally formed.
Each of the plurality of movable side first parts is integrally formed.
Each of the plurality of fixed-side second parts is thinner in the axial direction than each of the plurality of fixed-side first parts.
Each of the plurality of movable side second parts is a circuit breaker characterized in that the thickness in the axial direction is thinner than that of each of the plurality of movable side first parts. With fixed electrodes
A movable portion that includes a movable electrode that can be brought into contact with and detached from the fixed electrode, a movable shaft that is connected to the movable electrode, and that can move in the axial direction of the movable shaft.
A fixed plate whose relative position to the fixed electrode is fixed and is a magnetic material,
It is provided with a movable plate that faces the fixed plate with a gap, is movable together with the movable portion, and is a magnetic material.
The fixed plate and the movable plate are arranged so that a magnetic attraction force is generated between the fixed plate and the movable plate through the gap when the fixed electrode and the movable electrode come into contact with each other. ,
The fixation plate comprises a plurality of fixation-side first portions and a plurality of fixation-side second portions having a lower magnetic permeance than the plurality of fixation-side first portions.
The movable plate includes a plurality of movable side first parts and a plurality of movable side second parts having a lower magnetic permeance than the plurality of movable side first parts.
When viewed from the axial direction, each of the plurality of fixed-side first parts overlaps with each of the plurality of movable-side second parts, and each of the plurality of movable-side first parts is fixed. Overlapping with each of the second part of the side,
Each of the plurality of fixed-side first parts is integrally formed.
Each of the plurality of movable side first parts is integrally formed.
Each of the plurality of fixed-side first parts has a fixed-side slope.
Each of the plurality of movable side first parts has a movable side slope, and has a movable side slope.
The fixed side slope is a circuit breaker characterized in that it faces the movable side slope in the axial direction. A fixed side support plate arranged on the opposite side of the fixed plate with respect to the movable plate and supporting the fixed plate, and the movable plate arranged on the opposite side of the movable plate with respect to the fixed plate. Further equipped with a movable side support plate to support,
The circuit breaker according to any one of claims 1 to 5, wherein the fixed side support plate and the movable side support plate are non-magnetic materials. Equipped with an operation mechanism
The operating mechanism includes an operating shaft connected to the movable shaft, a base plate penetrating the operating shaft and being a magnetic material, and an operating spring arranged on the side opposite to the movable shaft with respect to the base plate. An end plate that is fixed to the operation shaft together with the base plate so as to sandwich the operation spring and is a magnetic material, a fixed iron core connected to the base plate between the base plate and the end plate, and the fixed iron core. Includes electromagnetic coils placed next to each other and permanent magnets placed between the fixed iron core and the end plate.
When the fixed electrode and the movable electrode are in contact with each other, the permanent magnet is in contact with the end plate.
The circuit breaker according to any one of claims 1 to 6, wherein the operating shaft moves so that the end plate is separated from the permanent magnet by the operating spring when the fixed electrode and the movable electrode are separated from each other. vessel.

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