JP3383550B2 - Circuit breaker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker.

[0002]

2. Description of the Related Art FIG. 20 shows a conventional example (for example, Japanese Patent Publication No. 61-45338). That is, in this two-pole circuit breaker, the handle 150 is rotatably pivotally attached to the fixed plate 159 arranged at a fixed position of the body 158, and the latch 150 of the latch member 152 is attached to the handle 150 via the link 151. A substantially central portion is connected, and one end side of the latch member 152 is tripped to a member 160.
The movable contact 157 of the movable contact 155 is opened and closed with respect to the fixed contact 156 via the drive member 154 at the other end of the latch member 160. Then, an overcurrent is detected by the bimetal 153 arranged at each pole, the trip member 160 is tripped by the displacement of the bimetal 153, and the engagement state between the trip member 160 and the latch member 152 is released. As a result, the movable contact 155 is forcibly opened by the action of the opening spring 161.

Therefore, the structure is simple and miniaturization is possible.

[0004]

However, since only the bimetal 153 for detecting an overcurrent is built-in, the short-circuit breaking speed when a short-circuit current flows is slow, and when used as a switch for branching, the main switch is opened and closed. There was a risk that the device would operate first and the entire circuit itself would shut off.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a circuit breaker whose structure can be simplified and whose instantaneous breaking speed can be increased.

[0006]

A circuit breaker according to a first aspect of the present invention includes a body, a handle provided on the body, and a latch member having a substantially central portion connected to the handle via a link. A tripping member that is pivotally attached to the body to lock one end of the latch member, and the other end of the latch member that is locked to the tripping member by operating the handle. And a contact portion that is opened and closed by being driven to open and close by being tripped by the tripping member and a latch member that is connected in series to the contact portion and an overcurrent flows. By a bimetal that drives the tripping member so as to trip the tripping member, a U-shaped magnetic plate in which the bimetal is arranged to pass the magnetic flux of the current flowing through the bimetal, and a short-circuit current flows through the contact portion. And a movable magnetic plate which tripping the above trip is sucked across the serial magnetic plate member, the
A movable magnetic plate main body in which the movable magnetic plate faces the magnetic plate.
And a drive piece for pressing the tripping member,
The removing member is a movable magnetic plate driven part that is pressed by the driving piece.
And a bimetal driven part driven by the bimetal
And the driving piece is engaged with the driven part of the movable magnetic plate.
And an elastic piece for pressing the movable magnetic plate body .

According to the circuit breaker of the first aspect, the structure of the handle, the link, the latch member, the trip member, and the contact portion can be simplified, and the substantially U-shaped magnetic plate for detecting the short-circuit current and the movable member. Since a magnetic plate is provided, the short-circuit breaking speed can be increased, and when used for branching,
It is possible to easily perform the breaking operation by the short-circuit current before the main switch breaks. Especially, it is easy to apply to the structure of the safety breaker which is a multi-pole type circuit breaker. Also elastic
The elastic deformation of the piece causes the movable magnetic plate to
More than the position of the tripping member when it contacts the magnetic plate
Since the tripping member can rotate to the magnetic plate side,
The plastic deformation of the bimetal does not interfere with the thermal operation of the imetal.
The shape can be prevented. This makes the U-shaped magnetic plate
The distance between the movable magnetic plate and the movable magnetic plate can be narrowed to prevent short circuit.
The breaking characteristics can be improved.

A circuit breaker according to a second aspect is the circuit breaker according to the first aspect, wherein the body is constructed by assembling at least two cases in which the handle is sandwiched from both sides, and a bearing hole is provided in each of the two cases. The trip member is provided with a shaft portion pivotally supported by the bearing hole so as to be pivotally supported, and the movable magnetic plate is pivotally supported by the shaft portion.

According to the circuit breaker of the second aspect, in addition to the effect of the first aspect, the work of mounting the movable magnetic plate is facilitated .

[0010]

The circuit breaker according to claim 3 is the circuit breaker according to claim 1.
Alternatively, in claim 2 , the movable magnetic plate body has an abutting portion that abuts on a tip side of the elastic piece. According to the circuit breaker of claim 3 , claim 1 or claim
In addition to the effect of item 2 , since only the tip end side of the elastic piece contacts the contact portion of the movable magnetic plate body, the elastic piece can be deformed with a small force, and the deformation of the bimetal can be further prevented.

The circuit breaker according to claim 4 is the circuit breaker according to claim 1,
In Claim 2 or Claim 3 , there is provided a spring for urging the handle in the OFF direction and for urging the trip member in the direction of locking the trip member. According to the circuit breaker of claim 4, the circuit breaker according to claim 1 or claim 2
In addition to the effect of claim 3 , a spring for rotating the handle in the OFF direction at the time of forced opening and a spring for urging the tripping member in the direction of locking the latch member can be formed by a common component. The points can be reduced.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. That is, this multi-pole circuit breaker includes the body 1, the handle 6, the drive member 20, the latch member 34, the trip member 35, the contact portions 85 and 86, the bimetal 54, the U-shaped magnetic plate 55, and the movable magnetic plate 61. Have.

The body 1 has a pair of side cases 2 and 4 and an intermediate case 3 between the pair of side cases 2 and 4, and contact points 8 are respectively provided between the intermediate case 3 and the side cases 2 and 4.
5 and 86 are accommodated, a means 81 for opening and closing the contact portions 85 and 86 is accommodated between the side cases 2 and 4, and contacting portions 82 and 83 for directly abutting the side cases 2 and 4 are provided. , 4 are provided. The contact portions 82, 83 are formed on the mounting surface 2a side of the side cases 2, 4, and the contact portion 82 is formed so as to extend the width of the intermediate case 3 and contact the contact portion 83. . In addition, the contact portions 82 and 83 and the contact portion 8
A zero-phase current transformer accommodation space 88 is formed between the end portion of the intermediate case 3 and the end portion of the intermediate case 3 which faces 2, 83.

The intermediate case 3 of the body 1 is superposed on one surface side of the first side case 2, and the second side case 4 is superposed on the first side case 2 via the intermediate case 3. The first-side case 2 has a pivot hole 5 of the handle 6 formed in a substantially cylindrical shape at a substantially central upper position, and the input / output terminals 7 and 8 located at both ends of the first-side case 2 are formed.
Engagement receiving portions 9 and 10 are provided in the vicinity of one of the two, the intermediate case 3 is provided with a fitting hole 12 that fits around the pivot hole 5, and the engaging receiving portions 9 and 10 are engaged. 11 and 13 are provided. As shown in FIG. 3, the engagement receiving portion 9 has a concave step shape, the engagement receiving portion 10 has a substantially semi-cylindrical concave shape, and the engagement portion 11 has an inclined portion guided by an edge portion of the engagement receiving portion 9. The engaging portion 13 is formed in a tubular shape such that a part of its peripheral surface engages with the engaging receiving portion 10. In the engaged state, as shown in FIG. 4, the engaging portions 11 and 13 sandwich the portion between the engaging receiving portions 9 and 10.

The first side case 2 has mounting recesses 15 formed at both ends on the side of the mounting surface 2a which also serves as the abutting portion 82, and terminal portions are formed at positions above the mounting recesses 15. A first fixed-side electric circuit configuration 17 that constitutes a contact portion 85 from one surface side of the first-side case 2;
A drive member 20 that supports the first movable-side electric circuit structure 18 and the movable contact 19 of the first movable-side electric circuit structure 18 is incorporated and positioned and supported. As shown in FIG. 5, the first fixed-side electric circuit structure 17 includes a fixed contact 21 having a fixed contact 20 and a terminal 8 having a quick-connect terminal structure provided at an end of the fixed contact 21. It is incorporated in the positioning support portion 68 of the side case 2. Reference numeral 24 is the release lever. The first movable-side electric circuit configuration 18 is a movable contactor 1 using a leaf spring having a movable contact 25 that contacts and separates from a fixed contact 20.
9 and a terminal screw type terminal 7 connected to this end portion, and incorporated in the positioning support portion 69. The input / output terminals 7 and 8 are provided at the ends of the first fixed-side electric circuit structure 17 and the first movable-side circuit structure 18 which are separated from each other, and are connected to the first side case 2, the intermediate case 3 and the second side case 4 from It is arranged to be exposed.

The intermediate case 3 is superposed on the one surface side of the first side case 2 and insulates the first fixed side electric circuit structure 17 and the first movable side electric circuit structure 18 from the adjacent other pole. The intermediate case 3 also serves to position and press the electric circuit structure and other necessary parts with respect to the first side case 2, and also forms holes 27 and 28 through which the handle 6, the driving member 20 and the tripping member 35 escape. There is. As described above, in order to form the zero-phase current transformer housing space 88 between the lower end portion of the intermediate case 3 and the contact portion 82, the height is made shorter than the height of the first side case 2. A second movable-side electric circuit structure 32 having a second fixed-side electric circuit structure 30 forming the contact portion 86 and a second movable contactor 31 incorporated in the driving member 20 is incorporated and supported on one surface side of the intermediate case 3. ing. Second fixed-side electric circuit configuration 30 and second movable-side electric circuit configuration 3
1 is a first side case 2 and an intermediate case 3 at the ends that are separated from each other.
And the input / output terminals 7 and 8 exposed from the second side case 4. The second fixed-side electric circuit structure 30 includes a fixed contact 51 having a fixed contact 50 and a terminal 8 having a quick-connect terminal structure with a release lever 24, and is incorporated in the positioning support portion 66 of the intermediate case 3. The second movable-side electric circuit structure 32 includes a movable contactor 31 having a movable contact 52 and a movable contactor 3.
1 is connected to the flexible wire 53, a bimetal 54 connected to the flexible wire 53, and a substantially Z-shaped terminal plate 7a in which the bimetal 54 is connected to the upper end and the terminal screw 7b is provided at the lower end.
And a terminal 7 having a U and a U-shaped magnetic plate 55 made of an iron plate for detecting a short circuit, which is attached to a vertical portion of the terminal plate 7a of the terminal 7 and surrounds the bimetal 54. The movable contactor 31 is incorporated in the portion 67.
Are held by the drive member 20. 63 is a bimetal adjusting screw.

In this way, the body 1 has the fixed contacts 20,
Fixed contacts 21 and 51 provided with 50 and fixed contact 2
The movable contacts 19 and 31 provided with the movable contacts 25 and 52 facing the 0 and 50 so that they can be separated from each other are housed. The bimetal 54 is connected to the contact portion 86 in series and drives the trip member 35 so as to pull the trip member 35 from the latch member 34 when an overcurrent flows. U-shaped magnetic plate 5
In FIG. 5, the bimetal 54 is arranged on the inner side and the magnetic flux of the current flowing through the bimetal 54 is passed through.

Movable contactors 19, 31 of the contact points 85, 86
The means 81 for opening and closing the body 1 partially protrudes from the body 1
A handle 6 rotatably pivoted therein and a movable contactor 19, 31 pivotally attached to the body 1 in a direction in which the movable contacts 25, 52 come in contact with and separate from the fixed contacts 20, 50. A drive member 20 for driving the drive member 20, an opening spring 42 for biasing the drive member 20 in a direction in which the movable contacts 25, 52 are separated from the fixed contacts 20, 50, and an abnormal current such as an overcurrent or a short-circuit current is detected. The tripping member 35 that is tripped when it is moved, and the drive member that is interlocked with the handle 6 and is in a state in which the movable contacts 25 and 52 are in contact with the fixed contacts 20 and 50 while being locked to the tripping member 35. The latch member 34 releases the drive member 20 by pressing 20 against the opening spring 42 to release the engagement with the trip member 35 by the trip operation of the trip member 35.

The handle 6, the drive member 20, and the trip member 35 pass through the intermediate case 3 and are pivotally attached between the side cases 2 and 4. The drive member 20 is a shaft portion 3 pivotally mounted between the first side case 2 and the second side case 4 so as to be rotatable.
9 and has a groove-shaped opening on the outer surface of the shaft portion 39 in the axial direction, and the drive member 20 is provided with an intermediate portion of the movable contactor 19 on the first side case 2
The concave portion 37 and the movable contactor 31 which are laterally inserted from the side
A concave portion 38 is provided for inserting the middle portion of the above in the lateral direction from the second side case 4 side. As shown in FIG. 8, a cylindrical shaft hole 40 in which a shaft 39 is formed in the first side case 2 and the second side case 3.
Is pivotally supported. Further, a contact pressure spring 42 is provided which is inserted into the concave portion 38 to press and fix the movable contact 31 and which applies the contact pressure in a state where the drive member 20 is rotated and the movable contact 52 is in contact with the fixed contact 50. The contact spring 42 is a compression coil spring. Therefore, when the movable contact 52 is separated from the fixed contact 50, the movable contact 3
1 is pressed against the upper surface of the recess 38 by the contact pressure spring 42, but when the drive member 20 rotates and the movable contact 52 comes into contact with the fixed contact 50, the rotation of the drive member 20 causes the drive member 20 to rotate. The movable contact 3 is provided at the end 20a of the movable contact side 52.
1 is pressed to compress the contact pressure spring 42 as shown in FIG. 9, and as a reaction thereof, the movable contact 52 applies contact pressure to the fixed contact 50.

The movable contactor 31 has protrusions 100 on both sides, and the recessed portion 101 loosely fitted in the protrusion 100 is provided with the drive member 20.
It is formed on the concave portion 38 and the facing surface of the body 1 facing the concave portion 38. Also, the contact pressure spring 42 is attached to the movable contact 31.
A protrusion 102 for fitting one end of the
There is provided a receiving seat 103 that is inclined toward the protrusion 102 at a position farther from the movable contact 52 than 02, and that supports the other end of the contact pressure spring 42.

The movable contact 19 is formed of a leaf spring because it is on the neutral pole side, and is elastically locked in the recess 37. Further, the drive member 20 has a contact portion 105 that abuts in the direction in which the movable contact 31 is separated. It has a separating piece 106 that projects outward in the direction, and forms an arcuate groove 107 in which the separating piece 106 is loosely fitted.

Further, as described above, the drive member 20 has the shaft 39 penetrating the intermediate case 3 and pivotally attached to the pair of side cases 2 and 4 at both ends, and the intermediate portion of the movable contactor 31 is inserted. Which has a concave portion 38 at both ends thereof, and a protrusion 110 extending in the rotating direction is provided substantially at the center of the surface of the driving member 20 on the side of the movable contact, and a pair of the side case 2 and the intermediate case 3 are combined. Grooves 111 on which the protrusions 110 slide are formed (see FIG. 7).

The opening spring 44 for urging the driving member 20 in the direction in which the movable contacts 19 and 31 are opened has a second side between the first side case 2 and the driving member 20, as shown in FIG. 5, for example. The case 4 is arranged substantially parallel to the direction perpendicular to the stacking direction, particularly the direction connecting the input / output terminals 7 and 8. That is,
The opening spring 44 is a coil spring that is a tension spring,
The projections 46 and 47 whose axial direction faces the longitudinal direction of the body 1 and whose both ends are provided on the drive member 20 and the first side case 2
Is hooked on.

A handle 6 is connected to the first side case 2, a latch member 34 is connected to the handle 6 via a link 33 to press the drive member 20, and a trip member for detecting an abnormal current that locks the latch member 34. Common parts including 35
It is incorporated and supported through the holes 27 and 28 of the intermediate case 3. The handle 6 has a shaft 58 at a substantially central portion, and the shaft 58 is pivotally supported by the bearing hole 5 of the first side case 2 and the cylindrical bearing hole 59 of the second side case 4. The handle 6 is provided with a handle portion 6a and a link connecting portion 6b on opposite sides with the shaft 58 interposed therebetween.

The link 33 is, for example, U-shaped, one end of which is fitted into the link connecting portion 6b, and the other end of which is fitted and connected to a shaft hole 34a provided in a substantially central portion of the latch member 34. The tripping member 35 is rotatably pivotally attached to the body 1 to lock one end of the latch member 34 in a normal state, and unlocks the latch member 34 when an abnormal current is detected to contact the contact portion. 85 and 86 are forcibly opened. Tripping member 3
Reference numeral 5 is made of a non-conductive synthetic resin, has a shaft portion 35a, a bimetal receiving portion 35b, and a latch locking portion 35c.
The shaft portion 35a is pivotally supported by a pair of cylindrical bearing holes 60 formed in the side case 2 and the second side case 4. The trip member 35 constitutes the bimetal receiving portion 35b for two poles.

Further, movable magnetic plates 61 arranged opposite to each other are provided at both ends of the magnetic plate 55 surrounding the bimetal 54, and the shaft portion 35 is provided.
It is rotatably supported on a. The movable magnetic plate 61 is attracted to both ends of the magnetic plate 55 due to the short-circuit current flowing through the contact portion 86 and causes the trip member 35 to trip.
The movable magnetic plate 61 is made of an iron plate, and for example, as shown in FIG. 16, a movable magnetic plate body 61a facing the magnetic plate 55.
And a drive piece 61b for pressing the trip member 35,
A shaft hole 61c is formed at a position between them and fitted in the shaft portion 35a. The trip member 35 includes, in addition to the bimetal driven portion 35b and the latch locking portion 35c, a movable magnetic plate driven portion 35d that is further pressed by the driving piece 61b.
The driving piece 61b has an elastic piece 35e that presses the movable magnetic plate body 61a in a state of being engaged with the movable magnetic plate driven portion 35d. 35f is a spring receiving part. The movable magnetic plate driven portion 35d is formed by a protrusion, and the elastic piece 35e is formed by an arm extending from the vicinity of the shaft portion 35a to give elasticity by resin elasticity. An abutting portion 61d that abuts on the tip side of the elastic piece 35e is bent and extends from the tip of the movable magnetic plate body 61a. A spring 65 is provided as shown in FIG. 1 for urging the handle 6 in the off direction and urging the trip member 35 in the direction of engaging the latch member 34. The spring 65 is a torsion coil spring, the winding portion of which is fitted and supported by the shaft 58 of the handle 6, one end of which is locked to the spring receiver 121 of the handle 6, and the other end of which is elongated is the spring of the trip member 35. It is locked to the receiving portion 35f.

One end of the latch member 34 is the trip member 3
5 is engaged with the latch engaging portion 35c of the drive member 20 at the other end.
The contact portion 86 is opened / closed by the latch member 34 by operating the handle 6, and the latch member 34 is opened by the trip member 35. . Further, when the tripping member 35 is tripped, the latching member 34 pressed by the driving member 20 by the opening force of the opening spring 44 contacts the positioning portion 70 so that the handle 6 is at a substantially central position between on and off. It is provided on the body 1 (see FIG. 10).

The second side case 4 is superposed on the one surface side of the first side case 2 via the intermediate case 3 so as to conceal the above-mentioned common parts and the like, and also serve to position and press the common parts and the like. Further, as shown in FIG. 1 and FIG. 12, etc., the connecting tools 73 using rivets, screws, etc. are passed through the four holes 90 of the body 1, and the first case 2 is inserted so as to penetrate the intermediate case 3.
And the second side case 4 are connected to each other, or the intermediate case 3 has a hole 90 formed in a tubular shape having a screw hole, and the first side case 2 is connected by a connecting tool 73 using a screw. Then, the second side case 4 and the intermediate case 3 are connected by a connecting tool 73 using a screw. However, the screw hole may be formed by tapping with a screw. Three of the four locations are at the same location on the side cases 2 and 4, but the remaining one is misaligned. One of them utilizes the center hole of the engaging portion 13. Also, the first side case 2 and the second side case 4
To directly connect the contact portions 82, 38 with the holes 91 at two places.
Are formed and connected by a connecting tool 74 similar to the connecting tool 73.

The operation of this circuit breaker will be described.
1 is in the off state, and the movable contacts 19 and 31 are opened by the opening spring 44. 9 is in the ON state, and when the handle 6 is operated, the latch member 34 is pushed through the link 33, and one end of the latch member 34 is locked to the latch locking portion 35c of the tripping member 35 while the other end is locked. Drive member 2
Movable contact 1 while rotating 0 and pulling the opening spring 44
9 and 31 are closed. The handle 6 is locked to the edge of the recess 27 beyond the reversal dead center. As a result, the input / output terminals 7 and 8
There is conduction between the two and current flows. FIG. 10 shows a case in which an overcurrent flows, the bimetal 54 bends by itself and heats the tripping member 35, and the tripping member 35 rotates to release the latch member 34 from the locking state. The return force of the pole spring 44 rotates the drive member 20 to open the movable contacts 19 and 31.
At this time, the movable magnetic plate body 6 is rotated by the rotation of the trip member 35.
1a hits the magnetic plate 55, and at this position, the latch engaging portion 3
5c is separated from the latch member 34, but the bimetal 5c
No. 4 continues to get more excited. At this time, the elastic piece 35e is shown in FIG.
Bending like 0 enables the movement of the bimetal 54. By releasing the tripping member 35, the driving member 20 pushes up the latch member 34, and the latch member 34 is locked to the positioning portion 70 provided in any of the first side case 2, the intermediate case 3 and the second side case. The handle 6 is in a neutral position. When the bimetal 54 returns and the accident is recovered, the handle 6 is turned off to pull up the latch member 34 by the link 33 and lock the latch member 34 to the trip member 35.
FIG. 11 shows a case where a short-circuit current flows in the electric path, and the movable magnetic plate 61 is attracted to the magnetic plate 55 by the attractive force of the magnetic flux flowing through the magnetic plates 55 and 61 surrounding the bimetal 54, and the trip member 35 is rotated. Then, the latch member 34 is tripped, and the movable contacts 19 and 31 are opened as described above.

According to this embodiment, the structure of the handle 6, the link 33, the latch member 34, the tripping member 35, and the contact portion 86 can be simplified, and the substantially U-shaped magnetic plate 55 for short-circuit current detection. Further, since the movable magnetic plate 61 is provided, the short-circuit breaking speed can be increased, and when used for branching, the breaking operation by the short-circuit current can be easily performed before the main switch breaks. Especially, it is easy to apply to the structure of the safety breaker which is a multi-pole type circuit breaker.

The body 1 is constructed by assembling at least two side cases 2 and 4 which hold the handle 6 from both sides,
A bearing hole 60 is provided in the two side cases 2 and 4, and a shaft portion 35a pivotally supported by the bearing hole 60 so as to be rotatable is provided in the trip member 35. The movable magnetic plate 61 is supported by the shaft portion 35a. Since the shaft is rotatably supported, the work of mounting the movable magnetic plate 61 is facilitated.

By elastically deforming the elastic piece 35e,
Since the tripping member 35 can be rotated further toward the magnetic plate 55 than the position of the tripping member 35 when the movable magnetic plate 61 contacts the substantially U-shaped magnetic plate 55, the bimetal 54 can be operated by heat. This does not hinder the plastic deformation of the bimetal 54. As a result, the distance between the U-shaped magnetic plate 55 and the movable magnetic plate 61 can be narrowed, and the short-circuit breaking characteristic can be improved.

Since the movable magnetic plate body 61d has an abutting portion 61d that abuts on the tip side of the elastic piece 35e, the elastic piece 3d is formed.
Only the tip side of 5e is the contact portion 61 of the movable magnetic plate body 61a.
Since it abuts against d, the elastic piece 35e can be deformed with a small force, and the deformation of the bimetal 54 can be further prevented. Since the handle 6 has a spring 65 for urging the handle 6 in the OFF direction and for urging the trip member 35 in the direction in which the trip member 35 is locked to the latch member 34, the handle 6 is forcedly opened.
Since the spring for rotating the lever in the OFF direction and the spring for urging the trip member 35 in the direction to lock the latch member 34 can be formed by common parts, the number of parts can be reduced.

Further, since the drive member 20 is pivotally attached to the body 1 to be rotatable, friction with the body 1 can be reduced, and the operation of the movable contacts 19 and 31 driven by the drive member 20. Since it is smooth, the operating force of the handle can be reduced and smooth opening and closing operations can be performed. In addition, since the space can be effectively utilized in the longitudinal direction of the body 1, that is, the direction connecting the input / output terminals 7 and 8, the spring length of the opening spring 44 can be increased and the opening force can be increased.

The movable contact 31 is provided in the recess 38 of the drive member 20.
Is inserted and supported by the contact pressure spring 42, it is easy to assemble the movable contactor 31. Since the contact pressure spring 42 is formed of the compression spring, the contact pressure spring 42 can be easily incorporated. Contact pressure spring 42 and protrusion 100 and concave portion 101
By engaging with, the movable contact 31 can be easily positioned and the movable contact 31 can be retained.

The contact pressure spring 42, which is a compression coil spring, can be positioned, and the movable contact 31 can be positioned on the projection 100 and the recess 101 of the body 1. When the contact portion 105 hits the movable contact 31 when a trip occurs, the drive member 2 moves in a direction in which the movable contact 52 separates from the fixed contact 50.
Since it is driven by 0, it becomes difficult to weld the contacts.

The body 1 has a separating piece 106 projecting outward from both sides of the end of the concave portion 38 of the drive member 20 on the side of the movable contact 52 with respect to the rotating direction of the movable contact 31. Since the arc-shaped groove 107 that loosely fits is formed, the arc generated when the movable contact 52 is forcibly opened is
It is possible to make it difficult to enter the inside of the drive member 20.

When the trip member 35 trips, the latching member 34 pressed by the driving member 20 by the opening force of the opening spring 44 contacts the positioning portion 70 at a substantially central position between the on and off states of the handle 6. Since it is provided on the body 1 as described above, the forced opening state can be easily recognized by the neutral position of the handle 6. A ridge 110 extending in the rotating direction is provided substantially at the center of the surface of the drive member 20 on the side of the movable contact 31, and the ridge 110 is formed by a combination of both the pair of side cases 2 and intermediate case 3.
Since the groove ridges 111 on which the electrodes slide are formed, insulation between the electrodes can be achieved.

Since the contact portions 85 and 86 are housed between the intermediate case 3 and the pair of side cases 2 and 4, respectively, the contact portions 85 and 86 can be isolated from each other and the side case 2 and the side case 2 can be separated from each other.
Since the four contact portions 82 and 83 are provided, the side case 2,
It is possible to easily eliminate not only the positional deviation between the side case 2 and the intermediate case 3 but also the positional deviation between the side cases 2 and 4, so that the storability of parts can be improved.

The means 81 for opening and closing the contact portions 85, 86 is
The handle 6, the drive member 20 that is pressed by one end of the latch member 34 connected to the handle 6 via the link 33 to open and close the contact portions 85 and 86, and the other end of the latch member 34 in the normal state. And a tripping member 35 that unlocks the latch member 34 and forcibly opens the contacts 85 and 86 when an abnormal current is detected.
Since the handle 6, the drive member 20, and the trip member 35 are rotatably pivoted between the side cases 2 and 4 after passing through the intermediate case 3, it is possible to reduce the error in the pivot position between the respective members.

Since the side cases 2 and 4 and the intermediate case 3 are connected to the connecting tool 73 and the contact portions 82 and 83 of the side cases 2 and 4 are connected to each other by the connecting tool 74, the cases are connected to each other. Rattling can be prevented. Contact part 8
Since 2,83 are the mounting surfaces 2a side of the side cases 2 and 4,
It is possible to prevent rattling when the circuit breaker is attached to a distribution board or the like.

Further, in the embodiment, the first fixed side electric circuit structure 17 and the first movable side electric circuit structure 18 and the driving member 20 which are the components of the first pole are incorporated in the first side case 2, and the intermediate case 3 is used. , The second fixed-side electric circuit structure 30 and the second movable-side electric circuit structure 32, which are the components of the second pole, and the common parts such as the handle 6 are incorporated, and the second-side case 4 is overlapped, As it is assembled,
It becomes possible to assemble all the components from the stacking direction of the intermediate case 3 and the second side case 4, and it becomes easy to align the components of each pole and the common component, and the assembly work of each component becomes easy.

The intermediate case 3 is attached to the pivot hole 5 of the first side case 2.
By engaging with the engagement receiving portions 9 and 10, the intermediate case 3 can be easily incorporated into the first side case 2. First
The movable side electric circuit structure 18 is assembled in the first side case 2, the movable contact 19 is fitted in the recess 37 of the drive member 20, and the movable contact 31 is fitted in another recess 38 of the drive member 20. Because it is possible, movable contact 1
It becomes easy to attach 9, 31 to the drive member 20.

The longitudinal direction of the body 1, that is, the second side case 4
Since the opening spring 44 is mounted in the stacking direction, the space for housing the opening spring 44 can be effectively used and long without increasing the dimension of the second side case 4 in the stacking direction. , Movable contacts 19 and 3 for the drive member 20
The urging force of 1 in the opening direction can be increased. In the present invention, the engagement receiving portions 9 and 10 may be provided in the vicinity of both of the input / output terminals instead of one of the input / output terminals. Further, the common parts such as the handle 6 are supported by the first side case 2 and the second side case 4, but they may be supported by the intermediate case 3, and particularly, for example, between the first side case 2 and the intermediate case 3, or in the middle. It may be supported between the case 3 and the second side case 4.

Contact portions 82, 83 and the contact portions 82, 83
Since the zero-phase current transformer housing space 88 is formed between the end of the intermediate case 3 and the end portion of the intermediate case 3, the easiness of housing components such as a zero-phase current transformer when applied to an earth leakage detection type circuit breaker is improved. . Although the common component for opening and closing the contact portions 85 and 86 is supported between the side cases 2 and 4, it may be supported between the side cases 2 and 4 and the intermediate case 3.

Further, the movable contactor 31 has the protrusions 100 formed on both sides, but the protrusions which form the recesses and are loosely fitted in the recesses are formed in the recess 38 of the drive member 20 and the body facing the recess 38. It may be formed on the opposite surface of No. 1. Further, in the embodiment of the present invention, the movable contact on the concave portion 37 side is composed of a leaf spring and has no bimetal. However, the movable contactor has the same configuration as the movable contactor 31 on the concave portion 38 side. , For example, while forming the projection 100, a bimetal 54 is connected between the movable contact and the terminal, the bimetal 54 is surrounded by the magnetic plate 55, and the trip member 35 for two poles is provided, for example, as shown in FIG. As shown, a pair of movable magnetic plates 61 may be provided on each shaft 35a. This is because the present invention is suitable for a multi-pole type circuit breaker.

Further, the combination of both one of the pair of side cases 2 and the intermediate case 3 forms the groove strip 111 on which the protruding strip 110 slides, but the groove is formed only in the side case 2 or 4 or only in the intermediate case 3. The line 111 may be formed.

[0049]

According to the circuit breaker of the first aspect of the present invention, the structure of the handle, the link, the latch member, the trip member and the contact portion can be simplified, and the substantially U-shaped magnetic plate for detecting the short-circuit current can be obtained. Also, since the movable magnetic plate is provided, the short-circuit breaking speed can be increased, and when used for branching, the breaking operation by the short-circuit current can be easily performed before the main switch breaks. Especially, it is easy to apply to the structure of the safety breaker which is a multi-pole type circuit breaker. Also,
Due to elastic deformation of the elastic piece, the movable magnetic plate is approximately U-shaped.
The position of the trip member when it comes into contact with the
In addition, the trip member can rotate to the magnetic plate side.
It does not interfere with the thermal operation of the bimetal,
It is possible to prevent plastic deformation. This makes the U shape
The gap between the magnetic plate and the movable magnetic plate can be reduced,
The short circuit breaking characteristic can be improved.

According to the circuit breaker of the second aspect, in addition to the effect of the first aspect, the work of mounting the movable magnetic plate is facilitated .

[0051] According to the circuit breaker according to claim 3, wherein
In addition to the effect of claim 1 or claim 2 , only the tip end side of the elastic piece abuts the abutting portion of the movable magnetic plate body, so that the elastic piece can be deformed with a small force, and the deformation of the bimetal is further prevented. be able to. According to the circuit breaker of claim 4 , in addition to the effect of claim 1, claim 2, or claim 3 , the spring for rotating the handle in the off direction at the time of forced opening and the direction for locking the latch member are provided. Since the spring for urging the tripping member can be formed by a common part, the number of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a handle and the like according to an embodiment of the present invention are incorporated.

FIG. 2 is an exploded perspective view of the whole.

FIG. 3 is a perspective view showing facing surfaces of a first side case and an intermediate case. Is.

FIG. 4 is a partial view showing a first side case, an intermediate case and a part of a locking portion.

FIG. 5 is a side view showing a state in which a first fixed-side electric circuit configuration and a first movable-side electric circuit configuration are incorporated in a first-side case.

FIG. 6 is a side view showing a state where a second fixed-side electric circuit configuration and a second movable-side electric circuit configuration are incorporated in an intermediate case attached to the first-side case.

FIG. 7 is a partial perspective view showing attachment of a drive member.

FIG. 8 is an exploded perspective view showing a relationship between a driving member and a movable contactor.

FIG. 9 is a side view showing a state where the second side case in the on state is removed.

FIG. 10 is a side view of an overcurrent trip state.

FIG. 11 is a side view of a short circuit trip state.

FIG. 12 is an external perspective view of a circuit breaker.

FIG. 13 is a side view thereof.

FIG. 14 is a cross-sectional view of the trip member as seen from the side opposite to the bimetal.

FIG. 15 is a perspective view showing a terminal, a bimetal, and a U-shaped magnetic plate.

FIG. 16 is a side view of the trip member facing the bimetal.

FIG. 17 is a side view showing a state in which the bimetal slightly operates and contacts the bimetal driven portion 35b.

FIG. 18 is a front view of the terminal seen from the side opposite to the bimetal.

FIG. 19 is a rear view of the terminal seen from the bimetal side.

FIG. 20 is an exploded perspective view of a conventional example.

[Explanation of symbols]

1 body 2 side case 3 middle case 4 side case 6 handles 19 Movable contact 20 Drive member 25 movable contacts 31 Movable contact 33 links 34 Latch member 35 Tripping member 35a shaft part 35b Bimetal driven part 35c Latch locking part 35e elastic piece 39 axes 42 Contact pressure spring 44 Opening spring 50 fixed contacts 51 Fixed contact 52 movable contact 54 Bimetal 55 U-shaped magnetic plate 61 Movable magnetic plate 61a Movable magnetic plate body 61b drive piece 61c Bearing hole 61d contact part 65 spring 86 contacts

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasushi Ninohata 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. (72) Hatsoo Mizuno, 1048, Kadoma, Kadoma, Osaka Matsushita Electric Works, Ltd. (72) Inventor Yoshiya Nakamichi 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. (72) Inventor, Takanobu Tanaka 1048, Kadoma, Kadoma City, Osaka Prefecture (72) Inventor, Matsui Yasushi 1048, Kadoma, Kadoma, Osaka Prefecture, Matsushita Electric Works, Ltd. (72) Inventor, Isao Tanaka 1048, Kadoma, Kadoma, Osaka Prefecture (56) Reference, Japanese Patent Laid-Open No. 62-15725 (JP, 62-15725) A) Actual exploitation Sho 53-55760 (JP, U) Japanese Patent Sho 61-45338 (JP, B1) Actual Sho 39-37508 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) ) H01H 73/50 H01H 7 1/16

Claims (4)

(57) [Claims] 1. An instrument body, a handle provided on the instrument body, a latch member having a substantially central portion connected to the handle via a link, and a pivot member rotatably attached to the instrument body. The tripping member that locks one end side of the latch member and the other end side of the latch member that is locked to the tripping member by operating the handle are opened and closed and the latch member is the tripping member. And a contact part that is opened to cause the contact to open, and the tripping member is driven so as to be tripped from the latch member when an overcurrent flows in series with the contact part. A bimetal, a U-shaped magnetic plate in which a bimetal is arranged to pass a magnetic flux of a current flowing through the bimetal, and a short-circuit current flows through the contact portion, so that the trip member is attracted to both ends of the magnetic plate. A movable magnetic plate that is operated to trip, and the movable magnetic plate is a movable magnetic plate facing the magnetic plate.
A flexible plate body and a drive piece that presses the trip member.
However, the trip member is a movable magnetic member that is pressed by the drive piece.
Plate driven part and bimetal driven by the bimetal
The driven part and the driving piece engage with the driven part of the movable magnetic plate.
The elastic piece that presses the movable magnetic plate body in a combined state
Circuit breaker having . 2. The body is constructed by assembling at least two cases that sandwich the handle from both sides.
A bearing hole is provided in one case, and a shaft portion pivotally supported by the bearing hole and pivotally attached to the trip member is provided in the trip member.
2. The circuit breaker according to claim 1, wherein the movable magnetic plate is rotatably supported by the shaft portion. Wherein said movable magnetic plate body, according to claim 1 or claim 2 having a contact portion in contact with the front end side of the elastic piece
Circuit breaker described. 4. The method of claim 1, claim 2 or claim 3 circuit breaker further comprising a spring for biasing the tripping member in a direction for locking the latch member urges the handle to the off-direction .