JP2020155329A - Circuit breaker - Google Patents

Abstract

To provide a circuit breaker having good responsiveness at the time of blockage.SOLUTION: A circuit breaker includes a contact part of a circuit, an attraction body becoming an electromagnet by the current of the circuit, and a movable body capable of switching to a holding state for holding the closed state of the contact part and opposing the attraction body with a gap, and a release state for moving to the attraction body side and making the contact part openable by releasing the holding of the contact part in the closed state. The attraction body and the movable body have an attraction side facing surface and a movable side facing surface placed oppositely to each other, and the attraction side facing surface and the movable side facing surface have contact parts coming into contact with each other in the holding state and a contact/detachment part separating from each other. By rotation of the movable body having a rotation origin at a position deviated from the contact part of the movable side facing surface, the contact/detachment parts of the movable side facing surface and the attraction side facing surface is separated. The attraction body is rotatable with a position deviated to the other side from the contact part of the attraction side facing surface as a rotation origin, and the attraction body is energized to the movable body side at a position deviated to the rotation origin side of the attraction body from the rotation origin of the attraction body.SELECTED DRAWING: Figure 2

Description

The present invention relates to a circuit breaker for protecting a device or the like on the load side by interrupting the circuit when an excessive current flows through the circuit connecting the power supply side and the load side.

In the circuit breaker, for example, as illustrated in Patent Document 1, a first core and a second core arranged so as to be detachable from each other when an excessive current such as a short-circuit current flows, It is known that a fixed contact and a movable contact are brought into contact with each other or separated from each other in a state where an operating plate forming a part of an opening / closing mechanism is locked to the second iron core.

In such a circuit breaker, a suction force is generated between the first core and the second core when an excessive current flows, and the second core is attracted to the first core side by the suction force, so that the second core is attracted. The fixed contact and the movable contact can be separated from each other by releasing the hooked state between the and the operating plate, that is, the electric circuit can be cut off by using the magnetic force.

Japanese Unexamined Patent Publication No. 2002-25415

By the way, in the circuit breaker having the above configuration, although it is possible to cut off the electric circuit when an excessive current flows, it is required to be able to cut off the electric circuit more quickly in order to improve safety.

Therefore, in view of such circumstances, it is an object of the present invention to provide a circuit breaker capable of improving the responsiveness at the time of interruption.

The circuit breaker of the present invention
The circuit that connects the terminal on the power supply side and the terminal on the load side,
A contact part that opens and closes the circuit
An attractor that becomes an electromagnet due to the current flowing through the circuit,
The closed state of the contact portion can be held, and the holding state is arranged so as to face the suction body with a gap that serves as a movement allowance toward the suction body, and the state of movement toward the suction body is described. A movable body that can be switched to a released state in which the contact portion is released from the closed state and the contact portion can be opened is provided.
The suction body has a suction side facing surface that is arranged toward the movable body side.
The movable body has a movable side facing surface that is arranged to face the suction side facing surface.
The suction-side facing surface and the movable-side facing surface are separated from each other so as to form a contact portion that comes into contact with each other on one side and a gap that can be brought into contact with each other on the other side when the movable body is in the holding state. Has a contact / detachment part,
The movable body can be rotated from a position shifted to one side of the contact portion of the movable side facing surface as a rotation starting point, and the movable body is brought into contact with and separated from the movable side facing surface as it rotates. The portion is configured to be brought into contact with and separated from the contact / detachment portion of the suction side facing surface.
The suction body is configured to be rotatable in a direction of contacting and separating from the movable body with a position shifted to the other side of the contact portion as a rotation starting point.
The suction body is provided with an urging member that urges the suction body toward the movable body at a position shifted from the rotation start point of the suction body to the rotation start point side of the movable body.

According to the circuit breaker having the above configuration, the suction body and the movable body are in a state where their contact portions are in contact with each other, and the rotation starting point of the suction body is the other side (from the contact portion of the suction body). Since it is set to a position shifted to the contact / detachment side), the movable body moves to the suction body side when an excessive current (that is, a current that generates a magnetic force that attracts the movable body to the suction body) flows through the circuit. When rotated, the contact portion of the movable side facing surface pushes the contact portion of the suction side facing surface to operate. At this time, the contact / detachment portion of the movable side facing surface moves toward the suction side facing surface, and the contact / separation portion of the suction side facing surface moves toward the movable side facing surface.

In this way, the movable body and the suction body approach each other so as to narrow the gap between them, so that the gap is quickly narrowed after the movable body starts to rotate. Further, as the gap is narrowed and the magnetic resistance is reduced, the attractive force is increased, so that the attractive force for attracting the movable body to the attractive body side is quickly increased.

Therefore, in the circuit breaker having the above configuration, the movable body is quickly attracted to the suction body side when an excessive current flows through the circuit, so that the contact portion can be opened in a short time.

Further, in the circuit breaker of the present invention,
The movable side facing surface and the suction side facing surface are formed of a flat surface from the contact portion to the contact / detachment portion.
The suction-side facing surface may be partially contacted with the movable-side facing surface in an inclined posture when the movable body is in the holding state.

According to such a configuration, when the movable body is in the holding state, the suction side facing surface is in an inclined posture with respect to the movable side facing surface in a state where the suction side facing surface and the movable side facing surface are partially in contact with each other. Therefore, the gap between the suction side facing surface and the movable side facing surface becomes narrower toward each contact portion side. As a result, the magnetic resistance between the suction body and the movable body becomes small in the region near the contact portion between the movable side facing surface and the suction side facing surface, so that when an excessive current flows through the circuit, the suction body and the movable body become A large suction force is generated between them.

Therefore, the reaction speed from the excessive current flowing through the circuit to the start of movement of the movable body becomes high, which makes it possible to improve the responsiveness at the time of interruption.

As described above, the circuit breaker of the present invention can exert an excellent effect that the responsiveness at the time of interruption can be improved by increasing the operating speed.

FIG. 1 is a perspective view of a circuit breaker according to an embodiment of the present invention. FIG. 2 is an exploded view of the circuit breaker according to the same embodiment. FIG. 3 is an enlarged view of the inside of the housing of the circuit breaker according to the embodiment. FIG. 4 is an explanatory view of a mounting structure of a suction body of the circuit breaker according to the same embodiment. FIG. 5 is an explanatory view of a mounting structure of a movable body of the circuit breaker according to the same embodiment. FIG. 6 is a view of the suction body of the circuit breaker according to the same embodiment as viewed from the movable body side. FIG. 7 is a view of the suction body of the circuit breaker according to the embodiment as viewed from the front side of the housing. FIG. 8 is a perspective view of a movable body of the circuit breaker according to the same embodiment. FIG. 9 is an operation explanatory view of the circuit breaker according to the same embodiment, and is an explanatory view of a state in which the contact portion is closed. FIG. 10 is an operation explanatory view of the circuit breaker according to the same embodiment, and is an explanatory view of a state in which the contact portion is open. FIG. 11 is an enlarged view of the region XI of FIG. FIG. 12 is an enlarged view of region XII of FIG.

Hereinafter, the circuit breaker according to the embodiment of the present invention will be described with reference to the accompanying drawings.

The circuit breaker is for protecting the equipment connected to the load side by interrupting the circuit when an abnormal current flows.

The circuit breaker 1 includes a housing 2 as shown in FIG. 1, a circuit 3 that electrically connects the power supply side and the load side as shown in FIG. 2, and an electromagnet due to a current flowing through the circuit 3. The suction body 4 and the contact portion 31 can be held in a closed state, and the suction body 4 is arranged to face the suction body 4 with a gap that serves as a movement allowance toward the suction body 4. The movable body 5 and the suction body 4 that can be switched to the release state in which the contact portion 31 is released from the closed state and the contact portion 31 can be opened while moving to the suction body 4 side are movable. It includes an urging member (hereinafter, referred to as a contact urging member) 6 that urges the body 5 and an operation mechanism 7 that can open and close the contact portion 31.

As shown in FIG. 1, the housing 2 has a front surface 20 which is one surface arranged on the front side when the circuit breaker 1 is attached to the distribution board and one surface opposite to the front surface 20 (used). It includes a back surface 21 (one surface that is sometimes arranged to face the mounting surface to the distribution board), and a pair of side surfaces 22 that are continuous with the front surface 20 and the back surface 21 and are arranged to face each other. The side surface 22 of the housing 2 is a surface facing the side surface 22 of the housing 2 of another circuit breaker 1 in a state where the circuit breaker 1 is installed on the distribution board.

In the present embodiment, the direction in which the front surface 20 and the back surface 21 of the housing 2 are lined up is the front-rear direction, the direction in which the pair of side surfaces 22 are lined up is the width direction, and the direction orthogonal to each of the front-back direction and the width direction is the vertical width direction. , And the following explanation will be given. The housing 2 is formed by joining two divided bodies, which are formed as separate bodies, in the horizontal direction.

As shown in FIG. 2, the circuit 3 has a pair of input terminals 30 connected to a distribution board, and a contact portion 31 capable of opening and closing an electric circuit connecting the pair of input terminals 30. Further, in the circuit 3, one contact portion 31 is provided for each input terminal 30.

In the following description, a state in which the contact portion 31 is closed will be referred to as a closed state, and a state in which the contact portion is open in the electric path will be referred to as an open state.

Each contact portion 31 has a fixed side terminal 310 fixed in the housing 2 and a movable side terminal 311 that can be brought in and out of the fixed side terminal 310.

The movable side terminal 311 is made of an elongated metal plate that can be elastically deformed. One end (base end) side of the movable side terminal 311 in the longitudinal direction is positioned (fixed) in the housing 2.

The other end (tip) side of the movable side terminal 311 in the longitudinal direction is spaced from the fixed side terminal 310 on the front side in the front-rear direction when the contact portion 31 is switched to the open state. Are arranged. Therefore, when the movable terminal 311 is operated by the operating mechanism 7, the movable terminal 311 bends (elastically deforms) toward the fixed terminal 310, so that the tip of the movable terminal 311 becomes the fixed terminal 310. It is configured to abut (ie, switch to the closed state).

The attracting body 4 is configured to generate a magnetic force according to the magnitude of the current flowing through the circuit. As shown in FIG. 11, the suction body 4 according to the present embodiment has a suction side facing surface 40 arranged toward the movable body 5. When the movable body 5 is in the holding state, the suction side facing surface 40 is movable at a portion on one side (a portion arranged on the starting point (rotating shaft 220) side when the suction body 4 moves). A contact portion (hereinafter referred to as a suction side contact portion) 400 that contacts the body 5 (movable side facing surface of the movable body 5 described later) and a movable body 5 (movable side facing surface of the movable body 5 described later) at the other side portion. The surface) includes a contact / detachment portion (hereinafter, referred to as a suction side contact / detachment portion) 401.

As shown in FIG. 6, the suction body 4 according to the present embodiment is a series of a pair of side wall portions 41 arranged to face each other at intervals in the lateral width direction and a series connected to each of the pair of side wall portions 41. It has a wall portion 42.

The pair of side wall portions 41 are arranged so as to be parallel to each other with the wall surfaces facing in the lateral width direction.

The suction side facing surface 40 is composed of a portion of the side wall portion 41 facing the movable body 5. As shown in FIG. 3, the suction side facing surface 40 according to the present embodiment is continuous with the suction side first region 40a facing the movable body 5 in the vertical width direction and the suction side first region 40a. Moreover, the suction side second region 40b facing the movable body 5 in a state of being arranged toward the front-rear direction (specifically, the front side in the front-rear direction) is included, and the suction-side contact portion 400 The suction side contact / separation portion 401 is located in the suction side first region 40a.

In the normal state (a state in which the operation of switching from the holding state to the holding release state is not taken), the suction side first region 40a is located at a place where the suction side contact / detachment portion 401 is farther from the movable body 5 than the suction side contact portion 400. It is inclined with respect to the vertical width direction so as to be positioned. Further, since the suction side first region 40a is composed of the front end faces (end faces arranged toward the movable body 5 side) of the pair of side wall portions 41, it is an elongated flat surface.

In the side wall portion 41, a region continuous with the rear end of the suction side second region 40b and the end surface (end surface on the front surface 20 side) of the side wall portion 41 is an inclined surface 41a. Therefore, the width (that is, height) of the side wall portion 41 in the front-rear direction is constant on the front side of the rear end of the suction side second region 40b, and on the rear side of the suction side second region 40b. It is formed so that the width in the front-rear direction gradually decreases toward the side of the continuous wall portion 42.

Further, each of the pair of side wall portions 41 is rotatably attached to the inside of the side surface 22 of the housing 2. More specifically, as shown in FIG. 4, each of the pair of side wall portions 41 is configured to be rotatable about an axis extending along the lateral width direction. In the present embodiment, a through hole 410 is formed in the side wall portion 41, and a rotation shaft 220 projecting from the inside of the side surface 22 of the housing 2 toward the inside in the lateral width direction is inserted into the through hole 410. Has been done.

Further, the through hole 410 is formed at a position deviated from the suction side contact portion 400 to the other side, that is, a position deviated to the suction side contact / detachment portion 401 side. In the present embodiment, the through hole 410 is formed at a position shifted from the central portion in the front-rear direction to the suction side contact / separation portion 401 side.

As described above, in the suction body 4, the rotation shaft 220 is the rotation starting point, and the suction side contact portion 400 and the suction side contact / detachment portion 401 make the rotation shaft 220 inserted through the through hole 410. It is designed to rotate along the circumferential direction around the center.

The tip side of the rotating shaft 220 has at least a dimension in the vertical width direction smaller than the hole diameter of the through hole 410. Therefore, the suction body 4 is also slidable in the vertical width direction within the range of the gap formed between the edge portion defining the through hole 410 and the rotation shaft 220.

As shown in FIG. 7, the continuous wall portions 42 are connected to each other at the ends of each side wall portion 41 on the side opposite to the movable body 5 side, and are arranged toward the movable body 5 side. Both the inner surface (hereinafter referred to as the inner surface) and the surface (hereinafter referred to as the outer surface) arranged toward the side opposite to the movable body 5 side are flat.

As shown in FIG. 8, the movable body 5 according to the present embodiment has a movable body main body 51 arranged to face the suction body 4 and a mounting portion 52 for mounting the movable body 5 in the housing 2. ..

As shown in FIG. 3, the movable body main body 51 is bent in accordance with the corner portion of the suction body 4 (the corner portion formed by the suction side first region 40a and the suction side second region 40b). .. The movable body main body 51 according to the present embodiment has a first facing portion 510 facing the suction side first region 40a, extending from the first facing portion 510 to the suction body 4 side and facing the suction side second region 40b. It has a second facing portion 511 and the like.

The first facing portion 510 has a flat plate shape, and one plate surface is arranged to face the suction side first region 40a. Further, the second facing portion 511 is also flat, and one plate surface is arranged to face the suction side second region 40b.

The first facing portion 510 has a dimension corresponding to the width (height) of the suction body 4 in the front-rear direction, more specifically, a dimension corresponding to the length of the suction side first region 40a. It is formed so as to be larger than one region 40a.

Further, the movable body 5 has a movable side facing surface 50 which is arranged to face the suction side facing surface 40. The movable side facing surface 50 has a contact portion (hereinafter, referred to as a movable side contact portion) 500 that contacts the suction side contact portion 400 in a state where its own state is switched to the holding state, and the suction side contact / separation. A contact / detachment portion (hereinafter, referred to as a movable side contact / detachment portion) 501, which is arranged with a gap that allows contact / detachment with respect to the portion 401, is included.

The movable side facing surface 50 of the present embodiment includes a movable side first region 50a facing the suction side first region 40a and a movable side second region 50b continuous with the movable side first region 50a on the suction side. A movable side second region 50b facing the second region 40b is included. The movable side contact portion 500 and the movable side contact / detachment portion 501 are set in the movable side first region 50a.

The movable side first region 50a is composed of the one plate surface of the first facing portion 510, and the movable side second region 50b is composed of the other plate surface of the second facing portion 511.

Further, the movable body main body 51 is arranged so as to be in a posture extending straight along the front-rear direction in the normal state (when in the holding state), and the movable side contact portion 500 is attached to the suction side contact portion 400. Contact. That is, the movable side first region 50a partially contacts the suction side first region 40a.

In the present embodiment, the rotation starting point side (in the present embodiment, the back surface 21 side of the housing 2) of the movable body 5 in the movable side first region 50a contacts the suction side contact portion 400, and the movable side first Since the side of the region 50a opposite to the rotation starting point side of the movable body 5 (in the present embodiment, the front surface 21 side of the housing 2) is brought into contact with and separated from the suction side contact / detachment portion 401, the movable side contact portion 500 is The movable side first region 50a is set in the portion on the rotation start point side, and the movable side contact / detachment portion 501 is set in the opposite side portion of the movable side first region 50a.

Further, as shown in FIG. 8, the movable body main body 51 is formed with a hook holding portion 53 used for holding the closed state of the contact portion 31. The hook holding portion 53 is a hole formed through one plate surface and the other plate surface of the movable body main body 51, and is, for example, a recess that opens only on the other plate surface side, or the other. It may be composed of a convex portion protruding from the plate surface of the above.

The mounting portion 52 is configured to rotatably mount the movable body main body 51 with respect to the inside of the housing 2, and is configured to serve as a rotation starting point of the movable body 5.

As shown in FIG. 5, the mounting portion 52 according to the present embodiment is located at the central portion in the axial direction and is located at both ends of the connecting portion 520 connected to the movable body main body portion 51 and the mounting portion 52 itself in the axial direction. It has a pair of shaft main body portions 521. Each shaft body portion 521 is formed so as to extend outward from the connecting portion 520 in the lateral width direction, and tends toward the suction body 4 side (front side in the rotation direction of the movable body 5) toward the tip end side. It is tilted like this. Therefore, the direction in which the shaft main body portion 521 extends from the connecting portion 520 is inclined with respect to the axial direction of the connecting portion 520.

Here, as shown in FIG. 5, the housing 2 is provided with a bearing portion 221 that rotatably receives the shaft main body portion 521.

The bearing portion 221 extends inward in the lateral width direction from the inner surface of the side surface 22 of the housing 2. Further, the bearing portion 221 according to the present embodiment is formed in an annular shape, and the shaft main body portion 521 is inserted from the inside in the lateral width direction. Two bearing portions 221 are formed in the housing 2 according to the number of shaft main body portions 521.

The bearing portion 221 is configured to include a receiving surface 221a that receives one end of the shaft main body portion 521, and when the movable body 5 rotates, the shaft main body portion 521 is sucked so as to roll along the receiving surface 221a. It is configured to move to the side of the body 4 or the side opposite to the suction body 4.

On the other hand, the bearing portion 221 is configured so that a gap is formed between the bearing portion 221 and the shaft main body portion 521 on the front side (front surface 22 side) in the front-rear direction and the shaft main body portion 521 in the vertical width direction. Has been done.

The mounting portion 52 is continuously provided at the end portion of the movable body main body 51 arranged on the back surface 21 side of the housing 2, and the shaft main body 521 is provided from both sides of the movable body main body 51 in the lateral width direction. Also extends outward. Further, the mounting portion 52 is rotatably inserted into the concave bearing portion 221 formed inside the side surface 22.

Further, the mounting portion 52 is arranged at a position shifted to the back surface 21 side of the housing 2 with reference to the contact position between the suction side contact portion 400 and the movable side contact portion 500. Therefore, the rotation starting point of the movable body 5 is arranged at a position shifted in the front-rear direction (a position shifted to the back surface 21 side of the housing 2) with respect to the rotation starting point of the suction body 4. As a result, the movable body 5 can rotate with the attachment portion 52 as the rotation starting point so that the movable side contact / detachment portion 501 is brought into contact with and separated from the suction side contact / detachment portion 401.

As shown in FIG. 3, the contact urging member 6 is fixed in a positioned state in the housing 2, and urges the continuous wall portion 42 of the suction body 4 toward the movable body 5. It is configured to do.

Further, the contact urging member 6 is displaced from the rotation starting point of the suction body 4 to the rotation starting point side of the movable body 5 in the front-rear direction (in the present embodiment, it is movable with the rotation starting point of the suction body 4). It is configured to urge the suction body 4 toward the movable body 5 (between the rotation starting points of the body 5).

As a result, in the normal state, the suction body 4 is in an inclined posture so that the suction side contact portion 400 approaches the movable side contact portion 500, and the suction side contact portion 400 becomes the movable side contact portion 500. When pressed, the suction side contact / detachment portion 401 rotates so as to approach the movable side contact / detachment portion 501 while maintaining the contact state between the suction side contact portion 400 and the movable side contact portion 500.

As shown in FIG. 2, in the operation mechanism 7, the contact unit 31 opens the state of the circuit breaker 1 in accordance with the operation of the operation unit 70 that can be operated from the outside of the housing 2 and the operation unit 70. A switching structure 71 for switching between an open state and a closed state in which the contact portion 31 is closed is provided.

The operation unit 70 has a base portion 700 that can rotate about a rotation axis extending along the lateral width direction, and a lever portion 701 that extends from the base portion 700 to the outside of the housing 2.

The switching structure 71 switches the contact portion 31 between the closed state and the open state, that is, the switching member 710 that brings the movable side terminal 311 into contact with and the fixed side terminal 310, and the opening urging that urges the switching member 710. It has a member 711 and an operating structure 712 for operating the switching member 710 by operating the operating unit 70.

The switching member 710 is slidable along the front-rear direction, and the movable side terminal 311 is fixed to the rear side (direction from the front surface 20 to the back surface 21 side of the housing 2) in the front-rear direction. It is configured to be pressed toward the terminal 310 and to release the pressed state against the movable terminal 311 as it slides toward the front side (direction from the back surface 21 to the front surface 20 side of the housing 2) in the front-rear direction. ..

The opening urging member 711 urges the switching member 710 toward the front side in the front-rear direction. The opening urging member 711 may be configured to always apply an urging force to the switching member 710, or when the switching member 710 slides from the front 20 side to the back 21 side of the housing 2. It may be configured to give an urging force to the switching member 710.

The operating structure 712 has a link member 712a connected to the operation unit 70 and a pushing member 712b attached to the link member 712a.

The link member 712a is connected to the operation unit side shaft portion 712aa inserted into the operation unit 70 along the lateral width direction and the operation unit side shaft portion 712aa, and is inserted into the pressing member 712b along the lateral width direction. It has a portion side shaft portion 712ab.

Further, the link member 712a pushes the pushing member 712b to the rear side in the front-rear direction as the operation unit 70 rotates to one side, and pushes the pushing member 712b as the operating unit 70 rotates to the other side. It is configured to be pulled toward the front side in the front-rear direction.

The pushing member 712b includes a base portion 712ba through which the pushing portion side shaft portion 712ab is inserted, an insertion piece portion 712bb that extends from the base portion 712ba and can be inserted into the hook holding portion 53, and the base portion. It has a pushing piece portion 712bc that extends from the 712ba to the side opposite to the insertion piece portion 712bb and is capable of pushing the switching member 710.

The push-in portion side shaft portion 712ab is inserted into the base portion 712ba along the lateral width direction, and the base portion 712ba can rotate around the push-in portion side shaft portion 712ab. Therefore, due to the rotation of the base portion 712ba with respect to the push-in portion side shaft portion 712ab, the insertion piece portion 712bb and the push-in piece portion 712bc also rotate around the push-in portion side shaft portion 712ab.

When the insertion piece portion 712bb is inserted into the hook holding portion 53 and the link member 712a pulls up the base portion 712ba, the insertion piece portion 712bb is on the front side in the front-rear direction with respect to the inner surface of the hook holding portion 53. In a state where the hook is stopped, inserted into the hook holding portion 53, and the link member 712a pushes the base portion 712ba, the hook is stopped on the rear side in the front-rear direction with respect to the inner surface of the hook holding portion 53. It is configured to.

The configuration of the circuit breaker 1 according to the present embodiment is as described above. Subsequently, the operation of the circuit breaker 1 will be described.

When the circuit breaker 1 is used to energize the electric circuit on the load side, each contact portion 31 is closed after the housing 2 is attached to the distribution board. In this embodiment, as shown in FIGS. 9 and 11, when the operation unit 70 is rotated, the link member 712a pushes the pushing member 712b toward the back surface 21 side of the housing 2.

At this time, since the insertion piece portion 712bb is hooked on the hook holding portion 53, the push piece portion 712bc moves to the rear side in the front-rear direction with respect to the insertion piece portion 712bb.

Further, the switching member 710 is pushed toward the rear side in the front-rear direction by the pushing member 712b to move, and the movable side terminal 311 is pushed toward the fixed side terminal 310 by the switching member 710.

Then, when the movable side terminal 311 and the fixed side terminal 310 come into contact with each other, the electric circuit is switched to the closed state.

The switching member 710 and the pushing member 712b are subjected to the urging force by the opening urging member 711 (the urging force toward the front side in the front-rear direction), but the switching member 710 and the pushing member 712b are pushed by the link member 712a. Since the movement toward the front side in the front-rear direction is locked, the state in which the movable side terminal 311 and the fixed side terminal 310 are in contact with each other (the state in which the circuit is closed) is maintained. That is, the movable body 5 switches to the holding state.

In the state where the movable body 5 is switched to the holding state, the suction side contact portion 400 and the movable side contact portion 500 are in contact with each other, while the suction side contact / separation portion 401 and the movable side contact / separation portion 501 are separated from each other. There is. As described above, the gap between the suction side facing surface 40 (suction side first region 40a) and the movable side facing surface 50 (movable side first region 50a) is formed between the suction side contact portion 400 and the movable side contact portion 500. Is partially contacted, so that it becomes narrower toward the suction side contact portion 400 and the movable side contact portion 500 side. Therefore, it is possible to keep the gap small when the movable body 5 is in the holding state while ensuring the movement allowance of the movable body 5 toward the suction body 4.

Further, as the gap becomes smaller, the magnetic resistance between the attracting body 4 and the movable body 5 also becomes smaller. Therefore, in such a state, an excessive current (that is, a magnetic force having a strength that attracts the movable body to the attracting body) is applied to the circuit 3. When a current) flows, a large suction force is generated between the suction body 4 and the movable body 5, and this suction force causes the movable body 5 to quickly start rotating toward the suction body 4 (that is, the movable body). The reaction speed of 5 becomes faster).

Further, when the movable body 5 rotates toward the suction body 4, the movable side contact portion 500 pushes the suction side contact portion 400, so that the suction body 4 rotates around the rotation shaft 220, and the suction side contact and disengagement. The portion 401 moves toward the movable side contact / detachment portion 501. Therefore, the suction side contact / separation portion 401 and the movable side contact / separation portion 501 move in a direction approaching each other.

Then, when the insertion piece portion 712bb is removed from the hook holding portion 53, the locked state is released as shown in FIGS. 10 and 12, so that the switching member 710 is released by the urging force of the opening urging member 711. And the pushing member 712b are urged toward the front side in the front-rear direction, so that the movable side terminal 311 is separated from the fixed side terminal 310 and the electric circuit is opened (that is, the circuit 3 is cut off).

As described above, according to the circuit breaker 1 according to the present embodiment, suction is performed when the movable body 5 is in the holding state, that is, when the movable body 5 is holding the closed state of the contact portion 31. The suction side first region 40a is inclined with respect to the movable side first region 50a in a state where the suction side first region 40a of the side facing surface 40 and the movable side first region 50a of the movable side facing surface 50 are partially in contact with each other. The gap between the suction side first region 40a and the movable side first region 50a becomes narrower toward the suction side contact portion 400 and the movable side contact portion 500 side.

As a result, in the region near the suction side contact portion 400 and the movable side contact portion 500, the magnetic resistance between the suction side first region 40a and the movable side first region 50a becomes small, so that the circuit 3 has an excessive current (that is, that is). A large attractive force is generated between the attractive body 4 and the movable body 5 when a magnetic force (current that generates a magnetic force strong enough to attract the movable body 5) flows through the attractive body 4.

Therefore, the reaction speed from the excessive current flowing through the circuit 3 to the start of movement of the movable body 5 becomes high, and this improves the responsiveness at the time of interruption (so-called instantaneous disconnection).

Then, when the movable body 5 rotates toward the suction body 4 when an excessive current flows through the circuit 3, the movable side contact portion 500 pushes and operates the suction side contact portion 400. At this time, the movable side contact / separation portion 501 moves toward the suction side facing surface 40 (suction side contact / separation portion 401), and the suction side contact / separation portion 401 moves toward the movable side facing surface 50 (movable side contact / separation portion 501). Move towards.

In this way, the movable body 5 and the suction body 4 approach each other so as to narrow the gap between them. Therefore, after the movable body 5 starts to rotate, the gap is quickly narrowed and the gap is narrowed. As the force becomes narrower, the magnetic resistance becomes smaller and the attractive force becomes stronger. Therefore, the attractive force for attracting the movable body 5 to the attractive body 4 side is rapidly increased.

Therefore, in the circuit breaker 1, the operating speed of the movable body 5 becomes faster when an excessive current flows through the circuit 3, and as a result, the movable body 5 is quickly attracted to the suction body 4 side, whereby the contact portion is formed in a short time. 31 can be made openable.

As described above, the circuit breaker 1 having the above configuration has a large suction force between the suction body 4 and the movable body 5 when an excessive current flows through the circuit 3 and the movable body 5 starts to rotate toward the suction body 4. Is possible, and after the movable body 5 starts to rotate toward the suction body 4, the suction force can be quickly increased, so that the contact portion 31 can be opened.

Therefore, the circuit breaker 1 according to the present embodiment can exert an excellent effect that the responsiveness at the time of interruption can be improved.

Further, since the suction body 4 of the present embodiment is provided with a rotation starting point closer to the other end side opposite to the one end side on which the suction side contact portion 400 is formed, the movable side contact portion 500 is provided. The rotational moment generated in the movable body 5 when the suction side contact portion 400 is pushed becomes large, and the suction body 4 can be moved to the movable body 5 side more quickly.

Further, in the circuit breaker 1 of the present embodiment, not only the suction side first region 40a of the suction side facing surface 40 and the movable side first region 50a of the movable side facing surface 50 face each other, but also the suction side facing surface 40 Since the suction side second region 40b and the movable side second region 50b of the movable side facing surface 50 also face each other, the suction force acting on the movable body 5 becomes stronger.

Further, in the present embodiment, in the vertical width direction of the suction body 4, there is a gap between the position of the continuous wall portion 42 and the position of the suction side second region 40b, but the continuous wall portion 42 and the side wall portion 41 By gradually increasing the vertical width of the side wall portion 41 from the boundary with the suction side second region 40b, the magnetic flux is generated from the continuous wall portion 42 to the suction side second region 40b and the suction side first region. Since the flow is linearly directed toward the upper end side of 40a, a strong suction force can be generated from the suction body 4.

Further, between the rotation shaft 220 which is the rotation starting point of the suction body 4 and the edge portion defining the through hole 410, and between the shaft body portion 521 and the bearing portion 221 which is the rotation starting point of the movable body 5. Since a gap is formed in, the suction body 4 and the movable body 5 can move within the range of this gap.

Since the housing 2 of the present embodiment is configured by joining the two divided bodies in the width direction as described above, for example, the rotation shaft formed in each divided body at the time of manufacturing. Even if the positions of the 220 and the bearing portion 221 are displaced, the suction body 4 and the movable body 5 can operate correctly if the positions and postures of the suction body 4 and the movable body 5 match within the gap.

It should be noted that the circuit breaker of the present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

In the above embodiment, the suction body 4 is configured to be rotatable by inserting the rotating shaft 220 of the housing 2 into the through hole 410, but the suction body 4 is not limited to this configuration. For example, the suction body 4 may be configured to be rotatable by inserting a shaft projecting from the suction body 4 into the housing 2, more specifically, the inner surface of the housing 2. ..

In the above embodiment, as for the suction side facing surface 40, the suction side contact / detachment portion 401 may be arranged at a position farther from the movable body 5 than the suction side contact portion 400 by tilting the entire suction body 4. The side facing surface 40 itself may have an inclined shape.

Although not particularly mentioned in the above embodiment, it is preferable that the suction side contact portion 400 and the movable side contact portion 500 are in point contact or substantially point contact.

In the above embodiment, the movable body 5 can be rotated by inserting the mounting portions 52 extending outward from both sides of the movable body main body 51 in the lateral width direction into the bearing portion 221. It was configured, but is not limited to this configuration. For example, the movable body 5 may be configured to be rotatable by having a structure in which a shaft projecting from the inner surface of the side surface 22 is inserted.

In the above embodiment, the movable body main body 51 of the movable body 5 has a plate shape, but the present invention is not limited to this configuration. For example, the movable body main body 51 of the movable body 5 may have a columnar shape or a frame shape.

In the above embodiment, the suction side facing surface 40 is inclined with respect to the front-rear direction, and the movable side facing surface 50 is arranged straight along the front-rear direction, but the present invention is not limited to this configuration. For example, both the suction side facing surface 40 and the movable side facing surface 50 may be tilted with respect to the front-rear direction, or only the movable side facing surface 50 may be tilted with respect to the front-rear direction.

1 ... circuit breaker, 2 ... housing, 3 ... circuit, 4 ... suction body, 5 ... movable body, 6 ... contact urging member, 7 ... operation mechanism, 20 ... front, 21 ... back, 22 ... side, 30 ... Input terminal, 31 ... Contact part, 40 ... Suction side facing surface, 41 ... Side wall part, 42 ... Continuous wall part, 50 ... Movable side facing surface, 51 ... Movable body body part, 52 ... Mounting part, 53 ... Hook holding part, 70 ... Operation part, 71 ... Switching structure, 220 ... Rotating shaft, 221 ... Bearing part, 310 ... Fixed side terminal, 311 ... Movable side terminal, 400 ... Suction side contact part, 410 ... Through hole, 500 ... Movable side contact part, 501 ... Movable side contact / detachment part, 700 ... Base part, 701 ... Lever part, 710 ... Switching member, 711 ... Opening urging member, 712 ... Acting structure, 712a ... Link member, 712aa ... Operation part side shaft part, 712ab ... Pushing part side shaft part, 712b ... Pushing member, 712ba ... Base part, 712bb ... Inserting piece part, 712bc ... Pushing piece part

Claims (2)

The circuit breaker of the present invention
The circuit that connects the terminal on the power supply side and the terminal on the load side,
A contact part that opens and closes the circuit
An attractor that becomes an electromagnet due to the current flowing through the circuit,
The closed state of the contact portion can be held, and the holding state is arranged so as to face the suction body with a gap that serves as a movement allowance toward the suction body, and the state of movement toward the suction body is described. A movable body that can be switched to a released state in which the contact portion is released from the closed state and the contact portion can be opened is provided.
The suction body has a suction side facing surface that is arranged toward the movable body side.
The movable body has a movable side facing surface that is arranged to face the suction side facing surface.
The suction-side facing surface and the movable-side facing surface are separated from each other so as to form a contact portion that comes into contact with each other on one side and a gap that can be brought into contact with each other on the other side when the movable body is in the holding state. Has a contact / detachment part,
The movable body can be rotated from a position shifted to one side of the contact portion of the movable side facing surface as a rotation starting point, and the movable body is brought into contact with and separated from the movable side facing surface as it rotates. The portion is configured to be brought into contact with and separated from the contact / detachment portion of the suction side facing surface.
The suction body is configured to be rotatable in a direction of contacting and separating from the movable body with a position shifted to the other side of the contact portion as a rotation starting point.
The suction body is provided with an urging member that biases the suction body toward the movable body at a position deviated from the rotation start point side of the movable body toward the rotation start point side of the movable body.
Circuit breaker. The movable side facing surface and the suction side facing surface are formed of a flat surface from the contact portion to the contact / detachment portion.
The suction-side facing surface partially contacts the movable-side facing surface in an inclined posture when the movable body is in the holding state.
The circuit breaker according to claim 1.