TWI744050B - Circuit breaker - Google Patents

Abstract

A circuit breaker (100) of the present invention 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 and 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 a movable electrode (41) of the movable portion (4) are in contact with each other. When viewed from an axial direction, each of a plurality of fixed-side first portion (11) of the fixed plate (1) overlaps with each of a plurality of movable-side second portion (22), and a plurality of movable side first portion (21) of the movable plate (2) overlaps with each of a plurality of fixed-side second portion (12). Each of the plurality of fixed-side first portion (11) is integrally configured. Each of the plurality of movable side first portion (21) is integrally configured.

Description

breaker

The present invention relates to a circuit breaker.

In the prior art, there is a circuit breaker that uses axial magnetic attraction generated by a fixed plate and a movable plate to maintain a closed pole state. The so-called closed state refers to the state where the movable electrode is in contact with the fixed electrode. In addition, the so-called open state refers to 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. 52-050573 (Patent Document 1 below), the movable plate (lower magnetic body) and the fixed plate (upper magnetic body) face each other with a gap therebetween. By allowing current to flow through the movable shaft passing through the center of the movable plate and 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 system is cut 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, magnetic flux in the axial direction is generated between the fixed plate and the movable plate, and therefore, a magnetic attraction force in the axial direction is generated between the fixed plate and the movable plate. (Prior technical literature) (Patent Document)

Patent Document 1: Japanese Patent Application Publication No. 52-050573

(The problem to be solved by the invention)

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

The present invention was developed in view of the above-mentioned problems, and its object is to provide a circuit breaker capable of providing a uniform gap in the axial direction between a fixed plate and a movable plate. (Means to solve the problem)

The circuit breaker of the present invention includes a fixed electrode, a movable part, a fixed plate, and a movable plate. The movable part includes a movable electrode and a movable shaft. The movable electrode system can be connected to and separated from the fixed electrode. The movable shaft system is connected to the movable electrode. The relative position between the fixed plate and the fixed electrode is fixed. The fixed plate is a magnetic body. The movable plate is opposed to the fixed plate with a gap. The movable plate can move together with the movable part. The movable plate is a magnetic body. 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 fixed plate includes a plurality of fixed-side first parts and a plurality of fixed-side second parts. The plurality of fixed-side second parts have a lower magnetic permeance than the plurality of fixed-side first parts. The movable plate includes a plurality of movable side first parts and a plurality of movable side second parts. The plurality of movable-side second parts have lower magnetic permeability than the plurality of movable-side first parts. When viewed from the axial direction, each of the plural fixed-side first parts overlaps with each of the plural movable-side second parts, and each of the plural movable-side first parts overlaps with the plural fixed-side second parts. Each overlaps. The fixed plate includes a fixed-side annular portion 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 parts and fixed-side annular parts are magnetic bodies. The plurality of movable-side first parts and movable-side annular parts belong to magnetic bodies. (Effects of the invention)

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

Hereinafter, the implementation type will be described based on the drawings. In addition, in the following, the same reference numerals are attached to the same or equivalent parts, and the description will not be repeated.

Implementation type 1.

1 to 3, the structure of the circuit breaker 100 of Embodiment 1 will be described. FIG. 1 is a perspective view schematically showing the structure of a circuit breaker 100 according to the first embodiment. FIG. 2 is a cross-sectional view schematically showing the structure of the circuit breaker 100 in the closed state according to the first embodiment. FIG. 3 is a cross-sectional view schematically showing the structure of the circuit breaker 100 in the open 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 part 4, a vacuum valve 5, an operating mechanism 6, and a circuit part 7. The circuit portion 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 of 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 a vacuum circuit breaker, and may also be a gas circuit breaker or a gas circuit breaker.

<About the structure of the movable part 4>

Next, the structure of the movable part 4 of Embodiment 1 will be described using FIGS. 2 and 3. As shown in FIG. 2, the movable part 4 includes a movable electrode 41, a movable shaft 42, a guide pin 43 and a movable-side spring seat 44.

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

As shown in FIG. 2, the movable part 4 is movable in the axial direction CL of the movable shaft 42. The movable portion 4 is configured to be movable in the axial direction CL by the operating mechanism 6. The movable electrode 41 can be connected to 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 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 protrudes out of the vacuum valve 5. The 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 seat 44.

<About the structure of the fixed plate 1 and the movable plate 2>

Next, the structure of the fixed plate 1 and the movable plate 2 of Embodiment 1 will be described using FIGS. 2 to 11. In the closed state, a magnetic attraction force is generated between the fixed plate 1 and the movable plate 2 by energization. The details of the magnetic attraction force 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 between the fixed plate 1 and the fixed 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 parts 11, a plurality of fixed-side second parts 12, and a fixed-side annular part 13. Each of the plurality of fixed-side first portions 11 is integrally configured. The fixed side annular portion 13 is formed integrally 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, in the center of the fixed plate 1, the through hole H1 is provided so that the movable shaft 42 may penetrate vertically. The movable shaft 42 is movable in the axial direction CL while penetrating the fixed plate 1. The thickness of the fixed plate 1 in the axial direction CL 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 has at least one of a fixed-side inner peripheral portion 131 (refer to FIGS. 4 and 6) and a fixed-side outer peripheral portion 132 (refer to FIGS. 5 and 6) By. As shown in FIGS. 4 and 6, the fixed-side inner peripheral portion 131 is provided on the inner periphery 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 (refer to FIG. 7 ). The fixed-side annular portion 13 has an annular shape configured to surround the through hole H1.

As shown in FIG. 4, the fixed-side annular portion 13 may be composed of only the fixed-side inner peripheral portion 131. As shown in FIG. 5, the fixed-side annular portion 13 may be composed 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 direction CL (refer to 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 a through hole extending in the radial direction of the fixed plate 1. The plurality of fixed-side second portions 12 are, for example, four provided at every 90 degrees from the center of the fixed plate 1. The number of the plurality of fixed-side second parts 12 can be appropriately determined.

As shown in Figs. 7 and 8, the movable plate 2 and the fixed plate 1 face each other with a gap therebetween. The movable plate 2 can move together with the movable part 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 state of the embodiment 1. FIG. 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 of the first embodiment. The movable plate 2 is fixed to the front end of the movable shaft 42.

As shown in FIG. 9, the movable plate 2 includes a plurality of movable-side first parts 21, a plurality of movable-side second parts 22, and a movable-side annular part 23. Each of the plurality of movable-side first parts 21 is integrally configured. The movable side annular portion 23 is formed integrally 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, the center of the movable plate 2 is provided with the through hole H2 so that the movable shaft 42 (refer FIG. 2) may penetrate vertically. The movable shaft 42 can move in the axial direction CL together with the movable plate 2 fixed to the front end of the movable shaft 42 in a state of penetrating the movable plate 2. The thickness of the movable plate 2 in the axial direction CL 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 has at least one of a movable inner peripheral portion 231 (refer to FIGS. 9 and 11) and a movable outer peripheral portion 232 (refer to FIGS. 10 and 11) By. As shown in FIGS. 9 and 11, the movable side inner peripheral portion 231 is provided on the inner periphery 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 outer peripheral portion 232 and the movable inner peripheral portion 231 are provided so as to surround the movable shaft 42. The movable side annular portion 23 has an annular shape configured to surround the through hole 2.

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 part 23 may be comprised only by the movable side outer peripheral part 232 as shown in FIG. As shown in FIG. 11, the movable side annular part 23 may have both the movable side inner peripheral part 231 and the movable side outer peripheral part 232. The movable plate 2 may have the same shape as the fixed plate 1 (refer to FIGS. 4 to 6).

In this 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 a through hole extending in the radial direction of the movable plate 2. The plurality of movable-side second portions 22 are, for example, four provided at every 90 degrees from the center of the movable plate 2. The number of the plurality of movable-side second parts 22 can be appropriately determined.

As shown in FIGS. 7 and 8, when viewed from the axial direction CL, each of the plurality of fixed-side first portions 11 overlaps with the plurality of movable-side second portions 22. In addition, 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 body. The movable plate 2 is a magnetic body. The material of the fixed plate 1 and the movable plate 2 is, for example, a soft magnetic body 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 constituted by a magnetic body.

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

Permeance represents the ease of passage of magnetic force. Permeance is the reciprocal of reluctance. The higher the magnetic permeability, the lower the magnetic resistance. The lower the permeability coefficient, the smaller the permeability. In the first portion 11 on the fixed side, magnetic force passes more easily than in the second portion 12 on the fixed side. In the movable side first portion 21, the magnetic force passes more easily than in the movable side second portion 22. The second portion 12 on the fixed side has a lower magnetic permeability than the first portion 11 on the fixed side. The movable second portion 22 has a lower magnetic permeability than the movable first portion 21.

In this embodiment, as shown in FIGS. 4 and 9, the second portion 12 on the fixed side and the second portion 22 on the movable side are slits, so they are filled with air. The air system has a lower magnetic permeability than the fixed-side first portion 11 and the movable-side first portion 21 which are magnetic bodies. Therefore, the fixed-side second portion 12 has a lower magnetic permeability than the fixed-side first portion 11, and the movable-side second portion 22 has a lower magnetic permeability than the movable-side first portion 21.

In this embodiment, as shown in FIGS. 7 and 8, each of the plurality of slits (the second portion 12 on the fixed side) provided in the fixed plate 1 and each of the plurality of first portions 21 on the movable side 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 this embodiment, as shown in FIGS. 4 and 9, the slit may be formed so that the width of the slit in the circumferential direction is enlarged from the center of the fixed plate 1 or the movable plate 2 to the outer periphery. In addition, the width of the slit in the circumferential direction may be constant.

＜About the structure of fixed electrode 3＞

Next, the configuration of the fixed electrode 3 of Embodiment Mode 1 will be described using 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 direction CL. The fixed electrode 3 includes a fixed-side body portion 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-side body portion 31 is connected to the fixed-side contact 32. The upper end of the fixed side body portion 31 protrudes from the internal space of the vacuum valve 5 to the outside of the vacuum valve 5. The upper end of the fixed-side body portion 31 is connected to the fixed-side conductor 71 outside the vacuum valve 5.

As shown in FIG. 2, in the closed state, the movable side contact 412 is in contact with the fixed side contact 32. In the closed state, the fixed side contact 32 and the movable side contact 412 are electrically connected. As shown in FIG. 3, in the open state, the fixed-side contact 32 is separated from the movable-side contact 412 by a distance (separation distance) that can interrupt the current. In the open state of the circuit breaker 100, the fixed side contact 32 and the movable side contact 412 are not electrically connected.

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

<About the composition of the vacuum valve 5>

Next, the structure of the vacuum valve 5 of Embodiment 1 will be described using FIG. 2. 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 maintained in a vacuum by the telescopic body 51, the insulating container 52, the upper flange 53 and the lower flange 54.

As shown in FIG. 2, the insulating container 52 forms the internal space of the vacuum valve 5 together with the upper flange 53 and the lower flange 54. The upper flange 53 is installed on the upper side of the insulating container 52. The lower flange 54 is installed on the lower side of the insulating container 52. One end of the telescopic body 51 is attached to the movable part 4. Specifically, the upper part of the telescopic body 51 is fixed to the outer periphery of the movable part 4. The telescopic body 51 is configured to be expandable and contractible. Therefore, even when the telescopic body 51 expands and contracts due to the movement of the movable portion 4 in the axial direction CL, the airtightness of the vacuum valve 5 is maintained. The sleeve 55 surrounds the spacer 56 with the lower flange 54 and is also installed on the lower flange 54. A fixing plate 1 is fixed to the lower side of the sleeve 55.

＜About the composition of operating mechanism 6＞

Next, the structure of the operating mechanism 6 of the first embodiment will be described with reference to FIGS. 2 and 3. The operating mechanism 6 is configured to move the movable portion 4 in the axial direction CL by moving the operating shaft 60. The operating mechanism 6 of this embodiment is an electromagnetic operating mechanism that moves the operating shaft 60 by electromagnetic force. The operating mechanism 6 is not limited to an electromagnetic operating mechanism, and may be a mechanical operating 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 (coil) 66, an operating spring 67, a compression spring 68, Operating mechanism side spring seat 69 and fixed iron core 600.

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

The pressure contact spring 68 is inserted by the guide pin 43 and the operating shaft 60. Both ends of the compression spring 68 are supported by the movable side spring seat 44 and the operating mechanism side spring seat 69. The pressure contact spring 68 is guided by the guide pin 43 so as not to deviate from the axial direction CL. The pressure contact spring 68 is arranged between the movable side spring seat 44 and the operation side spring seat 69, thereby connecting 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 compression spring 68, the movable shaft 42 is moved by the operating shaft 60.

The substrate 61 is penetrated by the operation shaft 60. The position of the substrate 61 is fixed, and the electromagnetic coil 66, the operating spring 67, and the fixed iron core 600 are connected to the lower side of the substrate 61. The substrate 61 is a magnetic body.

The operating spring 67 is arranged on the opposite side of the movable shaft 42 with respect to the base 61. The operating spring 67 is inserted by the operating 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 cylindrical shape surrounding the operating shaft 60 and the operating spring 67. The upper end of the fixed iron core 600 is fixed to the base plate 61. In the closed state, the lower end of the fixed iron core 600 and the permanent magnet 65 support the end plate 62. The fixed iron core 600 includes a first fixed iron core portion 63 and a second fixed iron core portion 64. An electromagnetic coil 66 is arranged between the first fixed core portion 63 and the second fixed 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 core portion 64. In the closed state, the end plate 62 is in contact with the first fixed 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 permanent magnet 65 from the first fixed core portion 63.

As shown in FIG. 2, the end plate 62 is fixed to the front end of the operating shaft 60 and encloses the operating spring 67 together with the base plate 61. The end plate 62 is configured to move together with the operation shaft 60 in the axial direction CL. 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 body. In the closed state, the base plate 61, the end plate 62, the first fixed core portion 63, the second fixed core portion 64, and the permanent magnet 65 constitute a closed magnetic circuit to attract the end plate 62.

As shown in FIG. 3, in the open pole state, the end plate 62 is pushed downward by the operating spring 67 and thereby separated from the first fixed core portion 63 and the permanent magnet 65. The end plate 62 is separated from the first fixed core portion 63 and the permanent magnet 65 by the operating spring 67, whereby the operating shaft 60 is moved downward to separate the fixed electrode 3 and the movable electrode 41 into an open pole state. In the open pole state, the distance between the end plate 62 and the permanent magnet 65 is greater than the distance between the fixed side contact 32 and the movable side contact 412 (separation distance).

<About the magnetic attraction force generated between the fixed plate 1 and the movable plate 2>

Next, mainly using FIGS. 12 to 13, the magnetic attraction force generated between the fixed plate 1 and the movable plate 2 in the closed state of the circuit breaker 100 of Embodiment 1 will be described. 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 state of 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 force is generated between the fixed plate 1 and the movable plate 2.

As shown in FIG. 12, in the closed state of this 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 size of the air gap D1a in the closed state in the axial direction CL is uniform. The dimension of the air gap D1a in the closed-pole state in the axial direction CL is the distance between the fixed plate 1 and the movable plate 2 to generate a magnetic attraction force. In this embodiment, in the closed state, the size of the air gap D1a is larger than the circumference of the movable shaft 42 of each of the fixed-side second portion 12 (refer to FIG. 4) and the movable-side second portion 22 (refer to FIG. 9). The smallest dimension of the direction is small. As shown in FIG. 13, the size of the air gap D1b in the open state of this embodiment is larger than the size of the air gap D1a in the closed state (refer to FIG. 12).

In the open state, the air gap D1b in the open state (refer to FIG. 13) is larger than the air gap D1a in the closed state (refer to FIG. 12) by at least the fixed side contact 32 and the movable side contact shown in FIG. 3 The amount of distance (separation distance) of 412.

In the closed state, current flows through the movable shaft 42 by energizing the movable shaft 42 shown in FIG. 7. By passing current through the movable shaft 42, a magnetic field is generated around the movable shaft 42. Thereby, magnetic flux is generated in the circumferential direction in the fixed plate 1 and the movable plate 2 which are magnetic bodies.

The magnetic flux is cut in the circumferential direction by the slits (the second portion 12 on the fixed side and the second portion 22 on the movable side). The magnetic flux system passing through the fixed-side first portion 11 is cut by the fixed-side second portion 12, and the magnetic flux system passing through the movable-side first portion 21 is cut by the movable-side second portion 22. The size of the air gap D1a where the fixed-side first portion 11 and the movable-side first portion 21 overlap in the axial direction is smaller than the size of the slit in the circumferential direction, so the magnetic flux passes through the air gap D1a. That is, magnetic flux is generated between the fixed plate 1 and the movable plate 2 in the axial direction CL, forming a magnetic gap. For this reason, a magnetic attraction force in the axial direction CL is generated between the fixed plate 1 and the movable plate 2. The smaller the size of the air gap D1a in the closed-pole state, the greater the magnetic flux generated between the fixed plate 1 and the movable plate 2, and the greater the magnetic attraction force.

Due to the magnetic attraction force, the movable plate 2 shown in FIG. 12 generates a force in the direction (upward direction) from the movable plate 2 to the fixed plate 1. Thereby, the movable plate 2 is pushed in the upward direction, and the fixed plate 1 is moved in the upward direction. In addition, since the movable portion 4 can move together with the fixed plate 1, the movable portion 4 also moves upward. Thereby, the movable electrode 41 is pushed against the fixed electrode 3. In addition, the fixed plate 1 generates a force in the direction (downward direction) from the fixed plate 1 to the movable plate 2, but since the fixed plate 1 is fixed to the vacuum valve 5, the fixed plate 1 does not move.

<Regarding the operation of the operating mechanism 6 for switching between the closed-pole state and the open-pole state of the circuit breaker 100>

Next, using FIGS. 14 and 15, the operation of the operating mechanism 6 for switching between the closed state and the open state of the circuit breaker 100 of the first embodiment will be described. The hollow arrows shown in FIGS. 14 and 15 are the forces generated in the circuit breaker 100 by the operating mechanism 6 or the fixed plate 1 and the movable plate 2.

By moving the movable shaft 42 connected to the operating shaft 60 in the axial direction CL, the closed state and the open state of the circuit breaker 100 are switched. The closed-pole operation for switching from the open-pole state to the closed-pole state is performed by moving the movable shaft 42 upward by the operating mechanism 6 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 moving the movable shaft 42 downward by the operating mechanism 6 so that the movable electrode 41 is separated from the fixed electrode 3. Specifically, the operating mechanism 6 utilizes the electromagnetic force of the electromagnetic coil 66, etc., the magnetic attraction force of the permanent magnet 65, the restoring force of the pressure contact spring 68, and the restoring force of the operating spring 67 to connect the operating shaft 60 to the operating shaft. The movable shaft 42 of 60 moves in the axial direction CL.

First, first explain the force generated in the circuit breaker 100 in the closed state and the open state, and then the operation of the operating mechanism 6 for switching from the closed state to the open state and from the open state to the closed state Be explained.

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

As shown in FIGS. 14 and 15, in the closed state and the open state, a downward force is generated on the operating shaft 60 by the restoring force of the pressure contact spring 68. In the closed state and the open state, 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 state, the upward force generated by the electromagnetic force of the electromagnetic coil 66 and the like and the magnetic attraction of the permanent magnet 65 is greater than that generated by the restoring force of the compression spring 68 and the restoring force of the operating spring 67 The downward force is great. Therefore, in the closed state, an upward force is generated on the operating 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 operating shaft 60 and the end plate 62, so a downward force is generated on the movable shaft 42.

The electromagnetic force of the electromagnetic coil 66 etc. is generated by the following process. First, current flows through the electromagnetic coil 66 of the operating mechanism 6 shown in FIG. 14. As a result, a magnetic field is generated around the electromagnetic coil 66, so magnetic flux is generated in the substrate 61, the permanent magnet 65, and the fixed iron core 600. Therefore, the substrate 61, the permanent magnet 65, and the fixed iron core 600 function as an electromagnet integrally, so that electromagnetic force is generated in the substrate 61, the permanent magnet 65, and the fixed iron core 600. The electromagnetic force of the electromagnetic coil 66 and the like attracts the end plate 62 upward. Therefore, the operating shaft 60 fixed to the end plate 62 generates an upward force generated by the electromagnetic force of the electromagnetic coil 66 or the like. The electromagnetic force of the electromagnetic coil 66 and the like is greater than the restoring force of the operating spring 67. In addition, as shown in FIG. 15, in the open pole state, no current flows through the electromagnetic coil 66, so electromagnetic force such as the electromagnetic coil 66 is not generated.

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

As shown in FIG. 14, in the closed state, the pressure contact spring 68 is compressed, so the pressure contact spring 68 has a restoring force. The restoring force of the compression spring 68 generates an upward force on the movable shaft 42. In addition, the restoring force of the compression spring 68 generates a downward force on the operating shaft 60. As the operating shaft 60 moves upward, the pressure contact spring 68 is compressed, so the upward force generated by the movable shaft 42 and the downward force generated by the operating shaft 60 increase.

As shown in FIG. 14, in the closed state, the operating spring 67 is compressed, so the operating spring 67 has a restoring force. The restoring force of the operating spring 67 generates an upward force on the substrate 61. In addition, due to the restoring force of the operating spring 67, a downward force is generated in the end plate 62 and the operating shaft 60.

In addition, in the closed-pole operation, when the pressure contact spring 68 can be compressed further, the operating shaft 60 moves further upward. Thereby, the pressure contact spring 68 is further compressed after the movable electrode 41 contacts the fixed electrode 3. The restoring force of the pressing spring 68 causes the force to act on the movable shaft 42 in the upward direction, so that the movable electrode 41 pushes the fixed electrode 3. Therefore, the closed state is maintained.

In addition, as shown in FIG. 14, since electricity is supplied in the closed state, an electromagnetic repulsive force is generated between the fixed electrode 3 and the movable electrode 41. Thereby, the fixed electrode 3 and the movable electrode 41 are to be separated from each other. Therefore, in order to maintain the closed state, it is necessary to push the fixed electrode 3 and the movable electrode 41 by a force stronger than the electromagnetic repulsion force.

Next, the operation of the operating mechanism 6 for switching from the open state to the closed state will be described. Through 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. 14.

First, in the open pole state shown in FIG. 15, a current is passed through the electromagnetic coil 66 of the operating mechanism 6. Thereby, a magnetic field is generated around the electromagnetic coil 66, and a magnetic flux passing through the first fixed core portion 63, the substrate 61, the second fixed core portion 64, and the permanent magnet 65 is generated. The electromagnet formed by this magnetic circuit causes the end plate 62 to be attracted upward, and the operating shaft 60 and the end plate 62 move upward together. Therefore, the movable shaft 42 moves upward.

Next, the operating shaft 60 moves upward, thereby causing the permanent magnet 65 to approach the end plate 62. Due to the magnetic attraction of the electromagnet and the permanent magnet 65, the operating shaft 60 and the end plate 62 are attracted upward together, so the operating shaft 60 moves further upward. Therefore, the movable shaft 42 moves further upward. Finally, as shown in FIG. 14, the permanent magnet 65 is in contact with the end plate 62. In addition, 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, so the movable shaft 42 moves further upward. As described above, the movable electrode 41 is brought into contact with the fixed electrode 3, thereby switching from the open state to the closed state.

Next, the operation of the operating mechanism 6 for switching from the closed state to the open state will be described.

First, in the closed 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 by the operating shaft 60 due to the electromagnetic force of the electromagnet is eliminated, so the operating shaft 60 and the end plate 62 move in the downward direction together. Therefore, the movable shaft 42 moves in the downward direction. In addition, as shown in FIG. 15, the end plate 62 is separated from the permanent magnet 65. Then, the upward force generated by the operating shaft 60 due to the magnetic attractive force of the permanent magnet 65 disappears. Therefore, the operating shaft 60 moves further downward. Therefore, the movable shaft 42 moves further downward. As described above, the movable electrode 41 is separated from the fixed electrode 3, thereby switching from the closed state to the open state.

＜About the effect＞

According to the circuit breaker 100 of this 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 formed. Therefore, the position of each of the fixed plate 1 and the movable plate 2 in the axial direction CL can be made uniform. Therefore, the dimension in the axial direction of the gap (air gap D1a) (refer to FIG. 12) between the fixed plate 1 and the movable plate 2 can be made uniform.

Since the dimension in the axial direction of the gap (air gap D1a) (refer to FIG. 12) between the fixed plate 1 and the movable plate 2 can be made uniform, the magnetic attraction force generated between the fixed plate 1 and the movable plate 2 can be reduced Uniform size. Therefore, the magnetic attraction force 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 Figures 4 and 9, each of the plurality of fixed-side first portions 11 and each of the plurality of movable-side first portions 21 are integrally configured, so each of the fixed plate 1 and the movable plate 2 can be integrated地 Manufacturing. Therefore, in the manufacture of the circuit breaker 100, the fixed plate 1 and the movable plate 2 can be manufactured by punching processing or the like. In addition, in the manufacture of the circuit breaker 100, the handling and assembly of the fixed plate 1 and the movable plate 2 become easy. In addition, since each of the fixed plate 1 and the movable plate 2 may have the same shape, 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, in the closed state, a magnetic attraction force is generated between the fixed plate 1 and the movable plate 2, so the fixed plate 1 and the movable plate 2 can maintain the closed state of the circuit breaker 100. Thereby, the fixed plate 1 and the movable plate 2 can assist the holding force of the operating mechanism 6 to maintain the closed state of the circuit breaker 100. Therefore, the holding force of the operating mechanism 6 for maintaining the closed state of the circuit breaker 100 can also be small. Therefore, the size of the operating mechanism 6 can be reduced, so the size of the circuit breaker 100 can be reduced. In addition, the permanent magnet 65 of the operating mechanism 6 can be reduced, so the manufacturing cost of the circuit breaker 100 can be reduced.

In the closed-pole state, the movable shaft 42 is energized, so magnetic attraction is generated in the fixed plate 1 and the movable plate 2. In contrast, 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 of the circuit breaker 100 from the open-pole state to the closed-pole state. Therefore, to generate magnetic attraction, no new equipment is required. Therefore, the manufacturing cost of the circuit breaker 100 can be reduced.

According to the circuit breaker 100 of this embodiment, as shown in FIGS. 4 and 9, the fixed plate 1 has a fixed side annular portion 13, so the rigidity of the fixed plate 1 is higher than when the fixed plate 1 does not have the fixed side annular portion 13 high. The movable plate 2 has the movable side annular portion 23, so the rigidity of the movable plate 2 is higher than when the movable plate 2 does not have the movable side annular portion 23. Thereby, the deformation of the fixed plate 1 and the movable plate 2 can be suppressed, so the size of the air gap D1a (refer to FIG. 12) can be made uniform.

As shown in FIG. 4, the fixed plate 1 has a fixed-side inner peripheral part 131, so the rigidity of the inner peripheral part of the fixed plate 1 is higher than when the fixed plate 1 does not have the fixed-side inner peripheral part 131. In addition, as shown in FIG. 9, the movable plate 2 has a movable inner peripheral portion 231, so the rigidity of the inner peripheral portion of the movable plate 2 is higher than when the movable plate 2 does not have the movable inner peripheral portion 231. Therefore, the deformation of the fixed plate 1 and the movable plate 2 can be suppressed.

As shown in FIG. 5, the fixed plate 1 has a fixed-side outer peripheral part 132, so the rigidity of the outer peripheral part of the fixed plate 1 is higher than when the fixed plate 1 does not have the fixed-side outer peripheral part 132. In addition, as shown in FIG. 10, the movable plate 2 has a movable outer peripheral portion 232, so the rigidity of the outer peripheral portion of the movable plate 2 is higher than when the movable plate 2 does not have the movable outer peripheral portion 232. Therefore, the deformation of the fixed plate 1 and the movable plate 2 can be suppressed.

As shown in FIG. 6, the fixed plate 1 has both a fixed-side inner peripheral portion 131 and a fixed-side outer peripheral portion 132. Therefore, the rigidity of the fixed plate 1 is higher than that of the fixed plate 1 having only the fixed-side inner peripheral portion 131 and the fixed-side outer peripheral portion 132. One is high. As shown in FIG. 6, the movable plate 2 has both a movable inner peripheral portion 231 and a movable outer peripheral portion 232. Therefore, the rigidity of the movable plate 2 is higher than that of the movable plate 2 having only the movable inner peripheral portion 231 and the movable outer peripheral portion 232. One is high. Therefore, the deformation of the fixed plate 1 and the movable plate 2 is suppressed. In addition, since the rigidity of the fixed plate 1 and the movable plate 2 is high, the thickness of the fixed plate 1 and the movable plate 2 in the axial direction CL can be reduced. Therefore, the materials of the fixed plate 1 and the movable plate 2 can be reduced, so that the manufacturing cost of the circuit breaker 100 can be reduced. In addition, since the thickness of the fixed plate 1 and the movable plate 2 is thin, the punching process becomes easy. Therefore, the processing time is shortened, and the manufacturing cost of the circuit breaker 100 can be reduced. The thickness of the fixed plate 1 and the movable plate 2 can also be reduced to a thickness that does not cause magnetic saturation.

According to the circuit breaker 100 of this embodiment, as shown in FIG. 4, the fixed side second portion 12 is a slit, so the fixed plate 1 is penetrated in the axial direction on the fixed side second portion 12. In addition, as shown in FIG. 9, the movable-side second portion 22 is a slit, so the movable plate 2 is penetrated in the axial direction in the movable-side second portion 22. Therefore, the permeance system of the fixed-side second part 12 and the movable-side second part 22 is lower than when the material of the fixed-side second part 12 and the movable-side second part 22 is a magnetic body. Therefore, compared to the case where the fixed plate 1 and the movable plate 2 are not penetrated, the magnetic attraction force generated between the fixed plate 1 and the movable plate 2 is increased.

According to the circuit breaker 100 of this embodiment, as shown in FIG. 2, when the fixed electrode 3 is in contact with the movable electrode 41, the operating shaft 60 moves so that the permanent magnet 65 is in contact with the end plate 62. In addition, when the fixed electrode 3 and the movable electrode 41 are separated, the operating shaft 60 moves such that the end plate 62 is separated from the permanent magnet 65 by the operating spring 67. As a result, the configuration of the operating mechanism 6 becomes simple, so that the size of the operating mechanism 6 can be reduced.

Implementation type 2.

16 to 21, the structure of the circuit breaker 100 of the second embodiment will be described. Unless otherwise specified, the second embodiment has the same configuration and effects as the first embodiment described above. Therefore, the same components as those in the aforementioned embodiment 1 are denoted by the same reference numerals and the description will not be repeated.

In this embodiment, as shown in FIG. 16, the thickness of each of the plurality of fixed-side second portions 12 in the axial direction CL is smaller than that of each of the plurality of fixed-side first portions 11. As shown in FIG. 17, the thickness of each of the plurality of movable-side second portions 22 in the axial direction CL is thinner than that of each of the plurality of movable-side first portions 21. As shown in FIG. 18, the circuit breaker 100 of this embodiment is different from the circuit breaker 100 of the embodiment 1 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 thicknesses. (Refer to Figure 2).

As shown in FIGS. 16 and 17, the fixed plate 1 and the movable plate 2 have a disk shape in a plan view. The fixed-side second portion 12 and the movable-side second portion 22 are not penetrated in the axial direction 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 direction CL as a whole.

In the closed state of this embodiment, the dimension of the gap (air gap) D2a between the movable side first portion 21 and the fixed side first portion 11 shown in FIG. 20 in the axial direction CL is due to the magnetic attraction force. the distance. 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, the fixed-side second portion 12 and the movable-side second portion 22 have thicknesses, so in a closed state, magnetic flux is also generated in the fixed-side second portion 12 and the movable-side second portion 22. Therefore, the magnetic flux generated in the air gap D2a is smaller than that in the first embodiment. Therefore, the magnetic attraction force generated between the fixed plate 1 and the movable plate 2 is smaller than when the fixed-side second portion 12 and the movable-side second portion 22 are slits. Therefore, for example, it is preferable to form the size of the air gap D2a to be smaller than that of the air gap D1a of Embodiment 1 (refer to FIG. 12), thereby increasing the magnetic attraction force. In addition, the thickness of the fixed-side second portion 12 and the movable-side second portion 22 in the axial direction CL may be made thin, thereby increasing the magnetic attraction force. In addition, the size in the radial direction of the fixed plate 1 and the movable plate 2 may be increased, thereby increasing the magnetic attraction force.

＜About the effect＞

According to the circuit breaker 100 of this embodiment, as shown in FIG. 20, the thickness of each of the plurality of fixed-side second parts 12 in the axial direction CL is thinner than the thickness of each of the plurality of fixed-side first parts 11. In addition, the thickness of each of the plurality of movable-side second portions 22 in the axial direction CL is thinner than each of the plurality of movable-side first portions 21. Therefore, since each of the plurality of fixed-side second parts 12 and each of the plurality of movable-side second parts 22 has a thickness, the rigidity of the fixed plate 1 and the movable plate 2 is higher than that of the plurality of fixed-side second parts 12 Each of the two and each of the plurality of movable-side second portions 22 does not have a thickness when it is high. Therefore, the deformation of the fixed plate 1 and the movable plate 2 can be suppressed.

Implementation type 3.

Next, the structure of the circuit breaker 100 of Embodiment 3 will be described using FIGS. 22 to 27. Unless otherwise specified, the third embodiment has the same configuration and effects as the first embodiment described above. Therefore, the same components as those in the aforementioned embodiment 1 are denoted by the same reference numerals and the description will not be repeated.

In this 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 parts 21 has a movable-side slope 25. The fixed side slope 15 is opposed to the movable side slope 25 in the axial direction CL.

As shown in FIG. 22 and FIG. 23, the fixed side slope 15 is opposed to the movable plate 2. The movable side slope 25 is opposed to the fixed plate 1. As shown in FIGS. 24 and 25, the fixed plate 1 and the movable plate 2 overlap in the axial direction CL. In addition, the fixed plate 1 is extended into the movable plate 2.

As shown in FIG. 26, the fixed side inclined surface 15 has a fixed side first inclined surface 151 and a fixed side second inclined surface 152. The fixed-side first inclined surface 151 and the fixed-side second inclined surface 152 are arranged on both sides in the circumferential direction of the fixed-side first portion 11. The fixed-side first inclined surface 151 and the fixed-side second inclined surface 152 are configured such that the distance between each other is enlarged toward the upper side in the axial direction CL.

The angle formed by the fixed-side first inclined surface 151 and the top surface of the fixed-side first portion 11 is the same as the angle formed by the fixed-side second inclined surface 152 and the top surface of the fixed-side first portion 11. The angle formed by the first inclined surface 151 on the fixed side and the top surface of the first portion 11 on the fixed side is an acute angle. The angle formed by the first inclined surface 151 on the fixed side and the top surface of the first portion 11 on the fixed side is, for example, 45 degrees. The angle formed by the second inclined surface 152 on the fixed side and the top surface of the first portion 11 on the fixed side is an acute angle. The angle formed by the second inclined surface 152 on the fixed side and the top surface of the first portion 11 on the fixed side is 45 degrees, for example.

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 in the circumferential direction of the movable-side first portion 21. The movable-side first inclined surface 251 and the movable-side second inclined surface 252 are configured such that the distance between each other is enlarged toward the lower side in the axial direction CL.

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

The movable side first inclined surface 251 is opposed to the fixed side first inclined surface 151 in the axial direction CL. The movable second inclined surface 252 is opposed to the fixed second inclined surface 152 in the axial direction CL.

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

As shown in FIG. 22, the fixed plate 1 and the movable plate 2 are opposed to the axis direction CL obliquely, so the gap (air gap) D3a between the fixed plate 1 and the movable plate 2 is provided obliquely with respect to the axis direction CL. Therefore, the magnetic attraction force generated between the fixed plate 1 and the movable plate 2 is generated obliquely with respect to the axial direction CL. In addition, as shown in FIG. 23, even in the open state, the air gap D3b is similarly provided obliquely with respect to the axial direction CL.

In the present embodiment, the magnetic attraction force is generated obliquely with respect to the axial direction CL, and therefore includes an axial direction CL component along the axial direction CL and a radial direction component along the radial direction. As shown in FIG. 26, it is configured to expand the distance between the first slant surface 151 on the fixed side and the second slant surface 152 on the fixed side. The radial component of the magnetic attraction force on the second inclined surface 152 on the fixed side faces the opposite direction in the radial direction. Therefore, the radial component of the magnetic attractive force is canceled out as a whole. Therefore, only the force in the axial direction CL is generated in the movable plate 2.

＜About the effect＞

According to the circuit breaker 100 of this embodiment, as shown in FIGS. 24 and 25, the fixed side inclined surface 15 and the movable side inclined surface 25 are opposed to each other, so the movable plate 2 extends into the fixed plate 1. Thereby, the thickness of the fixed plate 1 and the movable plate 2 can be increased, so the rigidity of the fixed plate 1 and the movable plate 2 can be improved.

Implementation type 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 the first embodiment described above. Therefore, the same components as those in the aforementioned embodiment 1 are denoted 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 this embodiment is different from the circuit breaker 100 of the embodiment 1 in that it further includes a fixed side support plate 14 and a movable side support plate 24.

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 part 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 bodies. As shown in FIG. 29 and FIG. 31, the movable side support plate 24 and the fixed side support plate 14 are disk-shaped.

Since the fixed side support plate 14 and the movable side support plate 24 are non-magnetic bodies, the fixed side support plate 14 and the movable side support plate 24 will not affect the magnetic attraction force generated between the fixed plate 1 and the movable plate 2. Therefore, the size of the air gap D4a in the closed state shown in FIG. 30 may also be the same as the air gap D1a in the closed state of Embodiment 1 shown in FIG. 12. In addition, the size of the air gap D4b in the open state shown in FIG. 32 may be the same as the air gap D1b in the open state of Embodiment 1 shown in FIG. 13.

＜About the effect＞

According to the circuit breaker 100 of this embodiment, since the fixed side support plate 14 supports the fixed plate 1, the rigidity of the fixed plate 1 is higher than when the fixed side support plate 14 does not support the fixed plate 1. In addition, since the movable side support plate 24 supports the movable plate 2, the rigidity of the movable plate 2 is higher than when the movable side support plate 24 does not support the movable plate 2. Thereby, the deformation of the fixed plate 1 and the movable plate 2 can be suppressed.

Above, it should be understood that the various points of the implementation modes disclosed in this specification are illustrations and not limitations. The scope of the present invention is not shown by the above description, but by the scope of the patent application, and includes the meaning equivalent to the scope of the patent application and all changes within the scope.

1: fixed plate 2: movable plate 3: fixed electrode 4: movable part 5: Vacuum valve 6: Operating mechanism 7: Circuit Department 11: Part 1 on the fixed side 12: Part 2 on the fixed side 13: Fixed side ring part 14: Fixed side support plate 15: Fixed side slope 21: Movable side part 1 22: Movable side part 2 23: Movable side ring part 24: Movable side support plate 25: Movable side slope 31: Fixed side main body 32: fixed side contact 41: movable electrode 42: movable shaft 43: guide pin 44: movable side spring seat 51: telescopic body 52: insulated container 53: upper flange 54: Lower flange 55: sleeve 56: Spacer 60: operating axis 61: substrate 62: end plate 63: The first fixed core part 64: The second fixed core part 65: permanent magnet 66: electromagnetic coil 67: operating spring 68: crimping spring 69: Operating mechanism side spring seat 71: fixed side conductor 72: movable side conductor 100: circuit breaker 131: Inner periphery of fixed side 132: Peripheral part of fixed side 151: Fixed side first slope 152: The second slope on the fixed side 231: Movable inner peripheral part 232: Movable side outer peripheral part 251: Movable side first slope 252: Movable side second slope 411: Movable electrode body 412: Movable side contact 600: fixed core 721: Flexible conductor part 722: Lower conductor part CL: axis direction D1a~D4a, D1b~D4b: air gap H1, H2: Through hole

Fig. 1 is a perspective view schematically showing the structure of a circuit breaker according to Embodiment 1 of the present invention. Fig. 2 is a cross-sectional view schematically showing the structure of a circuit breaker in a closed state according to Embodiment 1 of the present invention. Fig. 3 is a cross-sectional view schematically showing the structure of a circuit breaker in an open-pole state according to the first embodiment of the present invention. Fig. 4 is a plan view schematically showing the structure of the fixing plate of the first embodiment of the present invention. Fig. 5 is a plan view schematically showing the structure of the fixing plate of the first modification of the first embodiment of the present invention. Fig. 6 is a plan view schematically showing the structure of the fixing plate of the second modification of the first embodiment of the present invention. FIG. 7 is a perspective view schematically showing the structure of the movable part, the fixed plate, and the movable plate in the closed state of Embodiment 1 of the present invention. FIG. 8 is a perspective view schematically showing the structure of the movable portion, the fixed plate, and the movable plate in the open pole state of the first embodiment of the present invention. Fig. 9 is a plan view schematically showing the structure of the movable plate of the first embodiment of the present invention. Fig. 10 is a plan view schematically showing the structure of the movable plate of the first modification of the first embodiment of the present invention. Fig. 11 is a plan view schematically showing the configuration of the movable plate of the second modification of the first embodiment of the present invention. 12 is a cross-sectional view schematically showing the structure of the movable portion, the fixed plate, and the movable plate in the closed state of the first embodiment of the present invention. FIG. 13 is a cross-sectional view schematically showing the structure of the movable portion, the fixed plate, and the movable plate in an open state according to the first embodiment of the present invention. Fig. 14 is a cross-sectional view showing the force generated by the circuit breaker in the closed state of Embodiment 1 of the present invention. Fig. 15 is a cross-sectional view showing the force generated by the circuit breaker in the open state of the first embodiment of the present invention. Fig. 16 is a perspective view schematically showing the structure of the fixing plate of the second embodiment of the present invention. Fig. 17 is a perspective view schematically showing the structure of the movable plate of the second embodiment of the present invention. 18 is a perspective view schematically showing the structure of the movable part, the fixed plate, and the movable plate in the closed state of the second embodiment of the present invention. FIG. 19 is a perspective view schematically showing the structure of the movable portion, the fixed plate, and the movable plate in the open state of the second embodiment of the present invention. 20 is a cross-sectional view schematically showing the structure of the movable portion, the fixed plate, and the movable plate in the closed state of the second embodiment of the present invention. 21 is a cross-sectional view schematically showing the structure of the movable portion, the fixed plate, and the movable plate in an open state according to the second embodiment of the present invention. 22 is a perspective view schematically showing the structure of the movable part, the fixed plate, and the movable plate in the closed state of the third embodiment of the present invention. FIG. 23 is a perspective view schematically showing the structure of the movable portion, the fixed plate, and the movable plate in the open state of the third embodiment of the present invention. 24 is a cross-sectional view schematically showing the structure of the movable portion, the fixed plate, and the movable plate in the closed state of the third embodiment of the present invention. 25 is a cross-sectional view schematically showing the structure of the movable portion, the fixed plate, and the movable plate in an open state according to the third embodiment of the present invention. Fig. 26 is a perspective view schematically showing the structure of the fixing plate of the third embodiment of the present invention. Fig. 27 is a perspective view schematically showing the structure of the movable plate of the third embodiment of the present invention. FIG. 28 is a cross-sectional view schematically showing the structure of a circuit breaker in a closed state according to Embodiment 4 of the present invention. 29 is a perspective view schematically showing the structure of the movable part, the fixed plate, the movable plate, the fixed side support plate, and the movable side support plate in the closed state of the fourth embodiment of the present invention. 30 is a cross-sectional view schematically showing the configuration of the movable part, the fixed plate, the movable plate, the fixed side support plate, and the movable side support plate in the closed state of the fourth embodiment of the present invention. FIG. 31 is a perspective view schematically showing the structure of the movable portion, the fixed plate, the movable plate, the fixed side support plate, and the movable side support plate in the open state of the fourth embodiment of the present invention. 32 is a cross-sectional view schematically showing the structure of the movable portion, the fixed plate, the movable plate, the fixed side support plate, and the movable side support plate in the open state of the fourth embodiment of the present invention.

1: fixed plate

2: movable plate

3: fixed electrode

4: movable part

5: Vacuum valve

6: Operating mechanism

7: Circuit Department

11: Part 1 on the fixed side

22: Movable side part 2

23: Movable side ring part

31: Fixed side main body

32: fixed side contact

41: movable electrode

42: movable shaft

43: guide pin

44: movable side spring seat

51: telescopic body

52: insulated container

53: upper flange

54: Lower flange

55: sleeve

56: Spacer

60: operating axis

61: substrate

62: end plate

63: The first fixed core part

64: The second fixed core part

65: permanent magnet

66: electromagnetic coil

67: operating spring

68: crimping spring

69: Operating mechanism side spring seat

71: fixed side conductor

72: movable side conductor

100: circuit breaker

231: Movable inner peripheral part

411: Movable electrode body

412: Movable side contact

600: fixed core

721: Flexible conductor part

722: Lower conductor part

CL: axis direction

Claims (8)

A circuit breaker comprising: a fixed electrode; a movable part including a movable electrode that can be connected to and separated from the fixed electrode and a movable shaft connected to the movable electrode, and the movable part can move in the axial direction of the movable shaft ; A fixed plate belonging to a magnetic body that does not contact the aforementioned fixed electrode to fix the relative position between each other; and a movable plate belonging to a magnetic body that faces the aforementioned fixed plate through a gap, And can move together with the movable portion without contacting the movable electrode; wherein the fixed plate and the movable plate are configured to generate a magnetic attraction force on the fixed plate through the gap when the fixed electrode and the movable electrode are in contact with each other. And the movable plate; the fixed plate includes a plurality of fixed side first parts and a plurality of fixed side second parts having a lower magnetic permeability than the plurality of fixed side first parts; the movable plate system A plurality of movable-side first parts and a plurality of movable-side second parts having a lower magnetic permeability than the aforementioned plurality of movable-side first parts; when viewed from the aforementioned axial direction, each of the aforementioned plural fixed-side first parts It overlaps with each of the plurality of movable-side second parts, and each of the plurality of movable-side first parts overlaps with each of the plurality of fixed-side second parts; the fixed plate includes the plurality of The fixed-side ring-shaped part formed integrally with each of the first part on the fixed side; The movable side annular portion; the plurality of fixed side first portions and the fixed side annular portion belong to a magnetic body; the plurality of movable side first portions and the movable side annular portion belong to a magnetic body. The circuit breaker according to claim 1, wherein 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 Any one; the movable-side annular portion has at least one of a movable-side inner peripheral portion provided on the inner periphery of the movable plate and a movable-side outer peripheral portion provided on the outer periphery of the movable plate; the fixed-side inner The 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. The circuit breaker according to claim 1 or claim 2, wherein each of the plurality of fixed-side second parts is a slit; and each of the plurality of movable-side second parts is a slit. A circuit breaker comprising: a fixed electrode; a movable part including a movable electrode that can be connected to and separated from the fixed electrode and a movable shaft connected to the movable electrode, and the movable part can move in the axial direction of the movable shaft ; A fixed plate belonging to a magnetic body that does not contact the aforementioned fixed electrode to fix the relative position between each other; and a movable plate belonging to a magnetic body that faces the aforementioned fixed plate through a gap, And can move together with the movable portion without contacting the movable electrode; wherein, the fixed plate and the movable plate are designed to be used when the fixed electrode is in contact with the movable electrode It is arranged in such a way that a magnetic attraction force is generated between the fixed plate and the movable plate through the gap; the fixed plate includes a plurality of fixed-side first parts and a magnetic permeability that is lower than the plurality of fixed-side first parts A plurality of fixed-side second parts; the movable plate includes a plurality of movable-side first parts and a plurality of movable-side second parts having a lower magnetic permeability than the plurality of movable-side first parts; the aforementioned plural fixed-side first parts Each of the one part is integrally constructed; each of the plurality of movable-side first parts is integrally constructed; the thickness of each of the plurality of fixed-side second parts in the axial direction is greater than that of the plurality of fixed-side second parts Each of the one part is thinner; each of the plurality of movable-side second parts has a thickness in the aforementioned axial direction that is thinner than each of the plurality of movable-side first parts. A circuit breaker comprising: a fixed electrode; a movable part including a movable electrode that can be connected to and separated from the fixed electrode and a movable shaft connected to the movable electrode, and the movable part can move in the axial direction of the movable shaft ; A fixed plate belonging to a magnetic body, the relative position between the fixed plate and the aforementioned fixed electrode is fixed; and a movable plate belonging to a magnetic body, the movable plate and the aforementioned fixed plate are opposed to each other through a gap, and can move together with the aforementioned movable portion ; Wherein, the fixed plate and the movable plate are arranged in such a manner 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 are in contact with each other. The fixed plate includes a plurality of fixed-side first parts and a plurality of fixed-side second parts having a lower magnetic permeability than the plurality of fixed-side first parts; the movable plate includes a plurality of movable-side first parts And a plurality of movable-side second parts having a lower permeance than the aforementioned plurality of movable-side first parts; each of the plurality of fixed-side first parts is formed integrally; each of the plurality of movable-side first parts 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; the aforementioned fixed-side slope is the same as the aforementioned movable-side slope Opposite along the aforementioned axis. The circuit breaker according to any one of claims 1, 4, and 5, further comprising: a fixed side support plate that is arranged on the opposite side of the fixed plate with respect to the movable plate and supports the fixed plate; and The fixed plate is arranged on the opposite side of the movable plate and supports the movable side supporting plate of the movable plate; the fixed side supporting plate and the movable side supporting plate are non-magnetic bodies. The circuit breaker according to any one of claims 1, 4, and 5 further includes an operating mechanism; the operating mechanism includes: an operating shaft connected to the movable shaft; and a magnetic substrate penetrated by the operating shaft; An operating spring arranged on the opposite side of the movable shaft with respect to the base plate; an end plate that is fixed to the operating shaft and is a magnetic body so as to sandwich the operating spring with the base plate; between the base plate and the end plate A fixed iron core connected to the aforementioned substrate; an electromagnetic coil arranged adjacent to the aforementioned fixed iron core; and arranged between the aforementioned fixed iron core and the front The permanent magnet between the end plates; wherein, when the fixed electrode is in contact with the movable electrode, the permanent magnet is in contact with the end plate; when the fixed electrode is separated from the movable electrode, the operating shaft is The operating spring moves the end plate so as to separate from the permanent magnet. The circuit breaker according to claim 1, wherein the plurality of movable-side second parts are provided with four or more; the plurality of fixed-side second parts are provided with four or more.

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