JP2022014948A - Circuit breaker - Google Patents

Abstract

To provide a circuit breaker capable of changing load of a movable piece spring using no jig for holding and moving a locking unit of a tip of the movable piece spring.SOLUTION: A circuit breaker 100 has a tripping device 40 for driving an opening/closing mechanism unit 30 for separating a fixed contact 27 and a movable contact 23. In the tripping device 40, a fixed yoke 41a is magnetized when an overcurrent flows through a conductive member 6. A movable piece 1 is attracted by the magnetized fixed yoke 41a and rotates about a rotation shaft 5 as a fulcrum. In a state in which no overcurrent flows, the movable piece 1 is biased in a direction away from the fixed yoke 41a by a movable piece spring 2. A fixed end 2b of the movable piece spring 2 is locked to a spring holder 3. The spring holder 3 is locked to a fixed component 4 to which the fixed yoke 41a is fixed in any of the plurality of mounting grooves 3b arranged in a direction from a power source side terminal 24 toward a load side terminal 25.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a circuit breaker tripping device such as a molded case circuit breaker or an earth-leakage circuit breaker.

A circuit breaker generally has an instantaneous disconnection characteristic, and needs a function to start instantaneous disconnection at a specified current of about 8 to 16 times the rated current. Therefore, a structure in which a movable piece interlocking with the main contact opening / closing mechanism is operated by an electromagnetic force generated when an overcurrent is generated is often used. The operating current of the movable piece can be adjusted by the load of the movable piece spring that urges the movable piece in the direction opposite to the electromagnetic force, but the position of the spring fixing end is changed to avoid rearrangement of the movable piece spring. Therefore, a method of increasing or decreasing the spring load is known. For example, Patent Document 1 discloses a configuration in which the engagement point between the magnet frame and the twist spring can be changed.

Japanese Unexamined Patent Publication No. 2008-192365

However, in such a conventional circuit breaker, when changing the load of the movable single spring, it is necessary to hold and move the locking portion at the tip of the movable single spring with a jig in a narrow space, and workability is achieved. There was a problem that it was bad.

The present disclosure has been made to solve the above-mentioned problems, and it is possible to change the load of the movable single spring without using a jig for holding and moving the locking portion at the tip of the movable single spring. Provide a circuit breaker that can.

The circuit breaker according to the present disclosure includes a fixed contact connected to one connection terminal, a movable contact provided to be able to contact and release the fixed contact, and one connection terminal and the other connection terminal. A circuit breaker that is assembled to a conductive member provided between them and is equipped with a tripping device that drives an opening / closing mechanism that separates a fixed contact and a movable contact when an overcurrent flows through the conductive member. The tripping device has a fixed component to which a fixed joint iron that is magnetized by an overcurrent flowing through a conductive member is fixed, and a movable piece that is rotatably supported and has a suctioned portion facing the fixed joint iron. From the movable piece spring, which has a coil part, and the movable end extending from the coil part to one side abuts on the movable piece and urges the sucked part in the direction of pulling it away from the fixed joint iron, and from the coil part of the movable piece spring. It has a fixed end positioning part that locks the fixed end extending to the other, and is locked to the fixed component in any of a plurality of mounting grooves arranged in a direction from one connection terminal side to the other connection terminal side. Equipped with a spring holder.

The circuit breaker according to the present disclosure includes a fixed contact connected to one connection terminal, a movable contact provided to be able to contact and release the fixed contact, and one connection terminal and the other connection terminal. A circuit breaker that is assembled to a conductive member provided between them and is equipped with a tripping device that drives an opening / closing mechanism that separates a fixed contact and a movable contact when an overcurrent flows through the conductive member. The tripping device has a fixed component to which a fixed joint iron that is magnetized by an overcurrent flowing through a conductive member is fixed, and a movable piece that is rotatably supported and has a suctioned portion facing the fixed joint iron. From the movable piece spring, which has a coil part, and the movable end extending from the coil part to one side abuts on the movable piece and urges the sucked part in the direction of pulling it away from the fixed joint iron, and from the coil part of the movable piece spring. It has a fixed end positioning part that locks the fixed end that extends to the other, and is locked to the fixed part at any position on the slope that extends gradually from one connection terminal side to the other connection terminal side. It is equipped with a spring slider.

According to the circuit breaker according to the present disclosure, the movable single spring can be changed by changing the mounting groove of the spring holder to be locked to the fixed component while the fixed end of the movable single spring is locked to the spring holder. The load of the movable single spring can be changed without using a jig that holds and moves the fixed end of the spring, and the efficiency of the work of adjusting the operating current is improved.

Further, according to the circuit breaker according to the present disclosure, the movable single spring can be moved by engaging with the fixed component at an arbitrary position on the slope of the spring slider while the fixed end of the movable single spring is locked to the spring slider. The load of the movable single spring can be changed without using a jig that holds and moves the fixed end of the single spring, and the efficiency of the work of adjusting the operating current is improved.

It is a side sectional view which shows the schematic structure of the circuit breaker which concerns on Embodiment 1 of this disclosure. It is a top view which shows the schematic structure of the circuit breaker which concerns on Embodiment 1 of this disclosure. It is a perspective view which shows the schematic structure of the tripping device of the circuit breaker which concerns on Embodiment 1 of this disclosure. It is a top view which shows the schematic structure of the tripping device of the circuit breaker which concerns on Embodiment 1 of this disclosure. It is a side sectional view which shows the schematic structure of the tripping device of the circuit breaker which concerns on Embodiment 1 of this disclosure. It is a perspective view which shows the schematic structure of the spring holder of the circuit breaker which concerns on Embodiment 1 of this disclosure. It is a schematic block diagram of the spring holder of the circuit breaker which concerns on Embodiment 1 of this disclosure. It is a perspective view which shows the schematic structure of the fixed part of the circuit breaker which concerns on Embodiment 1 of this disclosure. It is a front view which shows the schematic structure of the fixed part of the circuit breaker which concerns on Embodiment 1 of this disclosure. It is a top view which shows the schematic structure of the tripping device of the circuit breaker which concerns on Embodiment 1 of this disclosure. It is a top view which shows the schematic structure of the tripping device of the circuit breaker which concerns on Embodiment 1 of this disclosure. It is a side sectional view which shows the schematic structure of the tripping device of the circuit breaker which concerns on Embodiment 1 of this disclosure. It is a side sectional view which shows the schematic structure of the tripping device of the circuit breaker which concerns on Embodiment 2 of this disclosure. It is a perspective view which shows the schematic structure of the spring holder of the circuit breaker which concerns on Embodiment 2 of this disclosure. It is a schematic block diagram of the spring holder of the circuit breaker which concerns on Embodiment 2 of this disclosure. It is a perspective view which shows the schematic structure of the tripping device of the circuit breaker which concerns on Embodiment 3 of this disclosure. It is a top view which shows the schematic structure of the tripping device of the circuit breaker which concerns on Embodiment 3 of this disclosure. It is a side sectional view which shows the schematic structure of the tripping device of the circuit breaker which concerns on Embodiment 3 of this disclosure. It is a perspective view which shows the schematic structure of the spring slider of the circuit breaker which concerns on Embodiment 3 of this disclosure. It is a schematic block diagram which shows the spring slider of the circuit breaker which concerns on Embodiment 3 of this disclosure. It is a perspective view which shows the schematic structure of the fixed part of the circuit breaker which concerns on Embodiment 3 of this disclosure. It is a front view which shows the schematic structure of the fixed part of the circuit breaker which concerns on Embodiment 3 of this disclosure. It is a perspective view which shows the schematic structure of the adjustment component of the circuit breaker which concerns on Embodiment 3 of this disclosure. It is a schematic block diagram of the adjustment component of the circuit breaker which concerns on Embodiment 3 of this disclosure. It is a top view of the tripping device of the circuit breaker which concerns on Embodiment 3 of this disclosure. It is a top view of the tripping device of the circuit breaker which concerns on Embodiment 3 of this disclosure.

Hereinafter, an example of a circuit breaker will be described with reference to the drawings, but the present invention is not limited to this configuration as long as the gist of the circuit breaker is not exceeded. 1 to 12 show a circuit breaker according to the first embodiment of the present disclosure. FIG. 1 is a side sectional view of the circuit breaker, and FIG. 2 is a top view of a partial perspective showing the circuit breaker.

As shown in FIGS. 1 and 2, the circuit breaker 100 is configured by using a housing 10 including a base 11 and a cover 12 made of an insulating material. Circuit cutoff units 20 for the number of poles are arranged on the base 11 at intervals from each other, and an opening / closing mechanism portion 30 is arranged on the upper part of the circuit cutoff unit 20. The cover 12 covers the circuit cutoff unit 20 of each pole on the base 11 and the opening / closing mechanism portion 30, and the operation handle 31 of the opening / closing mechanism portion 30 projects from the handle window hole 12a of the cover 12.

The circuit cutoff unit 20 of each pole is in contact with the power supply side terminal 24 provided on the base 11, the fixed contact 27 extending from the power supply side terminal 24 and provided with the fixed contact 21, and the fixed contact 21. A movable contact 22 that opens and closes, a movable contact 23 that is provided at one end and is freely rotatably held by a crossbar 32, and the movable contact 23 via a movable contact holder 26. It is generated at the time of interruption by the connected stripping device 40, the load side terminal 25 extended from the stripping device 40, and the arc extinguishing plate 51 provided on the tip side of the movable contact 23 and surrounding both contacts 21 and 22. It is provided with an arc extinguishing device 50 for extinguishing an arc.

The opening / closing mechanism portion 30 includes a well-known trip bar 33 driven by the tripping device 40.

Further, the circuit cutoff unit 20 of each pole is configured to be the same as each other, and the crossbar 32 is common to the circuit cutoff unit 20 of each pole and is orthogonal to the circuit cutoff unit 20 of each pole on the base 11. Is located in. The crossbar 32 is rotated about its axis by the opening / closing mechanism portion 30, and each movable contact 23 in the circuit cutoff unit 20 of each pole is attached. When the crossbar 32 rotates about its axis, the movable contacts 23 of each pole are rotated at the same time, and the rotation of the movable contacts 23 causes the movable contacts 22 to come into contact with and open the fixed contacts 21. Release.

The tripping device 40 is arranged between the power supply side terminal 24 and the load side terminal 25, and is assembled to the conductive member 6 having the load side terminal 25 at one end. FIG. 3 is a perspective view showing the tripping device, FIG. 4 is a top view of the stripping device, and FIG. 5 is a side sectional view of the stripping device. As shown in FIG. 3, the tripping device 40 includes an electromagnetic stripping device 41 and a thermal tripping device 42.

The electromagnetic stripping device 41 is fixed to the fixed component 4 and is attracted to the fixed joint iron 41a magnetized by the overcurrent flowing through the conductive member 6 and the fixed joint iron 41a magnetized at the time of instantaneous interruption, and causes the trip bar 33 to be attracted to the fixed joint iron 41a. It includes a movable piece 1 to be driven, a movable piece spring 2 for urging the movable piece 1, and a rotating shaft 5 for supporting the movable piece 1 with a fixing component 4. Further, the electromagnetic tripping device 41 includes a spring holder 3 for holding the movable single spring 2, and the spring holder 3 is attached to the fixed component 4.

As shown in FIG. 5, the thermal tripping device 42 has a heater 42a extending from the conductive member 6 and a rivet 41e (shown in FIG. 5) on the fixed joint iron 41a and the fixed component 4 with the heater 42a interposed therebetween. ) Is provided with the thermal element 7.

As shown in FIG. 3, the movable piece 1 has a flat plate-shaped suctioned portion 1a provided facing the fixed joint iron 41a and a pair of arm portions extending upward from both sides of the suctioned portion 1a and facing each other. It has 1b and an operation piece portion 1c protruding upward from one of the pair of arm portions 1b. The operation piece 1c presses the trip bar 33 at the time of trip. A through hole is formed in the arm portions 1b facing each other, and the rotation shaft 5 is inserted therethrough.

The movable single spring 2 is, for example, a double torsion type torsion coil spring. The movable single spring 2 has a pair of coil portions 2c wound around a rotating shaft 5, a movable end 2a extending from the pair of coil portions 2c to one side, and a pair extending from the pair of coil portions 2c to the other. Has a fixed end 2b of. The movable end 2a is in contact with the suctioned portion 1a of the movable piece 1, and the pair of fixed ends 2b are locked so as to be positioned by the fixed end positioning portion 3a of the spring holder 3. The movable piece spring 2 urges the attracted portion 1a of the movable piece 1 in the direction of pulling it away from the fixed joint iron 41a, that is, in the clockwise direction on the paper in FIG.

When an overcurrent such as a short-circuit current flows through the conductive member 6 and the heater 42a, the fixed joint iron 41a is magnetized by the magnetic flux generated by this overcurrent, and the attracted portion 1a of the movable piece 1 is instantly attracted to the fixed joint iron 41a. Will be done. The movable piece 1 rotates around the rotation shaft 5 against the force urged by the movable piece spring 2, and the operation piece 1c pushes the trip bar 33 along with this rotation to press the circuit breaker 100. It trips and shuts off.

6A and 6B are perspective views showing the spring holder 3, FIG. 7A is a top view of the spring holder 3, and FIG. 7B is a side view of the spring holder 3. As shown in FIGS. 6 and 7, for example, the spring holder 3 is provided with substantially rectangular flat surface portions 3c at intervals from each other when viewed from above. The flat surface portion 3c is formed with a plurality of mounting grooves 3b extending from one side side of the flat surface portion 3c toward the other side side. The flat surface portion 3c is connected by a side surface portion 3d perpendicular to the flat surface portion 3c. A pair of fixed end positioning portions 3a formed in a hook shape are provided at the tip extending inclined from the flat surface portion 3c.

FIG. 8 is a perspective view showing the fixed part, and FIG. 9 is a front view of the fixed part. The fixing component 4 has a plate-shaped fixing portion 4a to which the fixed joint iron 41a is fixed, a back surface portion 4b extending upward from the fixing portion 4a and having an open center, and the back surface portion 4b facing each other at both ends. It has a pair of folded side surface portions 4c. A pair of mounting portions 4d to which the spring holder 3 is locked are formed on the back surface portion 4b. The mounting portion 4d is, for example, a through hole penetrating the back surface portion 4b. Further, a shaft hole into which the rotation shaft 5 of the movable piece 1 is inserted is formed in the pair of side surface portions 4c. A plurality of rivet holes into which the rivets 41e are inserted are formed in the fixing portion 4a.

In the spring holder 3, the power supply side terminal is provided by the movable single spring 2 in a state where the mounting groove 3b is attached to the mounting portion 4d of the fixed component 4 and the fixed end 2b of the movable single spring 2 is locked to the fixed end positioning portion 3a. It is urged to the 24 side. The flat surface portion 3c of the spring holder 3 is arranged substantially parallel to the conductive member 6 having the load side terminal 25 at one end in a state of being urged by the movable single spring 2. Further, the plurality of mounting grooves 3b are arranged in the direction from the load side terminal 25 to the power supply side terminal 24. Then, one of the mounting grooves 3b is engaged with the mounting portion 4d of the fixing component 4, and the spring holder 3 is held by the fixing component 4. Since the spring holder 3 is urged by the movable single spring 2, it is possible to prevent the spring holder 3 from falling off from the fixed component 4 due to vibration or the like.

FIG. 10 is a top view of the tripping device in a state where the spring holder and the fixing component are disengaged. As shown in FIG. 10, the spring holder 3 can move in the direction in which the plurality of mounting grooves 3b are extended, that is, in the vertical direction of the paper surface in FIG. 10, and when the spring holder 3 is moved downward, the relationship between the mounting grooves 3b and the mounting portion 4d The stop is released, and the spring holder 3 can be moved in the direction of the power supply side terminal 24 or the load side terminal 25.

11 and 12 are a top view and a side sectional view of a tripping device in a state where the spring holder is moved toward the load side terminal and locked. In this state, since the fixed end 2b of the movable piece spring 2 moves in the direction of the load side terminal 25 as compared with the state shown in FIG. 4, the urging force on the movable piece 1 increases and a larger electromagnetic force acts. The movable piece 1 does not operate until. As a result, the operating current for instantaneous detachment can be increased.

Here, the spring holder 3 is preferably made of a synthetic resin material. As a result, even after the inspection in which the operating current is checked, the temperature of the spring holder 3 is suppressed from becoming high, and the operator can safely safely use the mounting groove 3b and the fixing component 4 of the spring holder 3 without providing a cooling time. The locking portion 4d can be unlocked.

Further, the side side where the mounting groove 3b is formed in the flat surface portion 3c of the spring holder 3 may be the side of the pair of arm portions 1b of the movable piece 1 that is closer to the arm portion 1b where the operation piece portion 1c is provided. preferable. As a result, it is possible to prevent the spring holder 3 from interfering with the operation piece portion 1c when the mounting groove 3b and the mounting portion 4d of the fixing component 4 are unlocked.

Further, FIGS. 6 and 7 show an example in which the spring holder 3 is provided with two flat surface portions 3c at intervals from each other, but further has a plurality of flat surface portions 3c, and mounting grooves 3b are formed in each. You may.

Further, FIGS. 6 and 7 show an example in which a plurality of mounting grooves 3b of the spring holder 3 extend from one side side of the flat surface portion 3c toward the other side side, but the mounting portion 4d of the fixed component 4 is shown. The shape may be elastically deformed so as to be locked to, for example, of the two flat surface portions 3c, one flat surface portion 3c has a mounting groove 3b formed from one side side to the other side side. The other flat surface portion 3c may be formed from the other side side toward one side side.

As described above, in the circuit breaker 100 according to the present embodiment, the tripping device 40 includes the spring holder 3, and the spring holder 3 locks the fixed end 2b extending from the coil portion 2c of the movable single spring 2. It has a fixed end positioning portion 3a and is locked to the back surface portion 4b of the fixed component 4 at any of the plurality of mounting grooves 3b arranged in the direction from the power supply side terminal 24 to the load side terminal 25. When adjusting the operating current, the spring holder 3 is moved to disengage the mounting groove 3b from the mounting portion 4d of the fixing component 4, and the locked mounting groove 3b and another mounting groove 3b are used. Install.

In this way, by moving the spring holder 3 and changing the mounting groove 3b that locks to the fixed component 4 while the fixed end 2b of the movable piece spring 2 is locked to the spring holder 3, the movable piece can be moved. The load of the movable single spring 2 can be changed without using a jig for holding and moving the fixed end 2b of the spring 2, and the efficiency of the work of adjusting the operating current is improved. Further, the intended load can be set while preventing the pair of fixed ends 2b of the movable single spring from being fixed at different positions from each other. Further, the load of the movable single spring 2 can be changed without directly touching the movable single spring 2, and the operating current of the instantaneous detachment can be easily changed. Further, since the operating current is adjusted without moving the initial position of the movable piece 1, the adjustment range can be increased while keeping the distance between the movable piece 1 and the main contact opening / closing mechanism constant.

Embodiment 2.
FIG. 13 is a side sectional view showing a schematic configuration of a circuit breaker tripping device according to the second embodiment of the present disclosure. FIG. 14 is a perspective view showing a spring holder of the circuit breaker according to the second embodiment of the present disclosure. 15 is a schematic configuration diagram showing a spring holder of the circuit breaker according to the second embodiment of the present disclosure, where FIG. 15A shows a top view and FIG. 15B shows a side view.

In the circuit breaker 100 of the first embodiment, an example in which a plurality of mounting grooves 3b are formed in parallel with the flat surface portion 3c of the spring holder 3 is shown, but in the circuit breaker 101 of the present embodiment, the spring is used. A plurality of mounting grooves 301b are formed upright from the flat surface portion 301c of the holder 301. Hereinafter, the points different from those of the first embodiment will be mainly described, and the same points will be omitted as appropriate.

As shown in FIGS. 14 and 15, the spring holder 301 is provided with a substantially rectangular flat surface portion 301c when viewed from above. A plurality of convex portions 301d vertically upright from a substantially rectangular surface are provided side by side on the flat surface portion 301c, and the space between the adjacent convex portions 301d is formed as a mounting groove 301b. The spring holder 301 is provided with a pair of fixed end positioning portions 301a formed in a hook shape at the tip extending from the flat surface portion 301c.

As shown in FIG. 13, the fixed end 2b of the movable single spring 2 is engaged with the fixed end positioning portion 301a, and the spring holder 301 is urged toward the power supply side terminal 24 by the movable single spring 2. In a state of being urged by the movable single spring 2, the flat surface portion 301c of the spring holder 301 is arranged substantially parallel to the conductive member 6 on which the load side terminal 25 is formed. Further, the plurality of mounting grooves 301b are arranged in the direction from the power supply side terminal 24 to the load side terminal 25. Then, one of the mounting grooves 301b is locked to the fixing component 4. The spring holder 301 is supported by the support spring 302. One end of the support spring 302 is attached to the spring holder 301 and the other end is attached to the fixing component 4.

The spring holder 301 can be moved in the direction in which the plurality of mounting grooves 301b extend, that is, in the vertical direction of the paper surface in FIG. 13, and when the spring holder 301 is moved downward, the mounting grooves 301b and the fixing component 4 are disengaged, and the spring holder The 301 can be moved in the direction of the power supply side terminal 24 or the load side terminal 25.

As described above, in the circuit breaker 101 according to the present embodiment, the tripping device 40 includes the spring holder 301, and the spring holder 301 locks the fixed end 2b extending from the coil portion 2c of the movable single spring 2. It has a fixed end positioning portion 301a and is locked to the back surface portion 4b of the fixed component 4 at any of a plurality of mounting grooves 301b arranged in a direction from the power supply side terminal 24 toward the load side terminal 25. When adjusting the operating current, the spring holder 301 is moved to disengage the mounting groove 301b from the mounting portion 4d of the fixing component 4, and the locked mounting groove 301b and another mounting groove 301b are used. By attaching it, the load that the movable piece spring 2 urges the movable piece 1 is changed.

In this way, by moving the spring holder 301 and changing the mounting groove 301b that locks to the fixed component 4 while the fixed end 2b of the movable piece spring 2 is locked to the spring holder 301, the movable piece can be moved. The load of the movable single spring 2 can be changed without using a jig for holding and moving the fixed end 2b of the spring 2, and the efficiency of the work of adjusting the operating current is improved. Further, it is possible to prevent the pair of fixed ends 2b of the movable single spring 2 from being fixed at different positions from each other, and to set the intended load. Further, the load of the movable single spring 2 can be changed without directly touching the movable single spring 2, and the operating current of the instantaneous detachment can be easily changed. Further, since the operating current is adjusted without moving the initial position of the movable piece 1, the adjustment range can be increased while keeping the distance between the movable piece 1 and the main contact opening / closing mechanism constant.

Embodiment 3.
16 to 26 show a circuit breaker according to the third embodiment of the present disclosure. 16 is a perspective view showing the tripping device, FIG. 17 is a top view of the stripping device, and FIG. 18 is a side sectional view of the stripping device. In the circuit breaker 102 of the present embodiment, the spring slider 8 is provided instead of the spring holder 3 of the circuit breaker 100 of the first embodiment. Hereinafter, the points different from those of the first embodiment will be mainly described, and the same points will be omitted as appropriate.

The circuit breaker 102 includes a fixed contact 27 connected to the power supply side terminal 24, a movable contactor 23 provided to be contactable and detachable from the fixed contactor 27, and a power supply side terminal 24 and a load side terminal 25. It is provided with a tripping device 60 which is assembled to the conductive member 6 provided between them and cuts off when an overcurrent flows through the conductive member 6.

The tripping device 60 includes an electromagnetic stripping device 61 and a thermal tripping device 42. The electromagnetic tripping device 61 is fixed to the fixed component 4 and is attracted to the fixed joint iron 41a magnetized by the overcurrent flowing through the conductive member 6 and the fixed joint iron 41a magnetized at the time of instantaneous interruption, and causes the trip bar 33. It includes a movable piece 1 to be driven, a movable piece spring 2 for urging the movable piece 1, and a rotating shaft 5 for supporting the movable piece 1 with a fixing component 4. Further, the electromagnetic tripping device 61 includes a spring slider 8 that holds the fixed end 2b of the movable single spring 2, and the spring slider 8 is attached to the fixed component 4. Further, an adjusting component 9 is attached between the spring slider 8 and the fixing component 4.

In the movable piece 1, the suctioned portion 1a abuts on the movable end 2a of the movable piece spring 2, and the suctioned portion 1a is separated from the fixed joint iron 41a by the movable piece spring 2, that is, in the clockwise direction on the paper in FIG. Being urged. Further, the fixed end 2b of the movable single spring 2 is locked to the fixed end positioning portion 8a of the spring slider 8.

19 is a perspective view showing the spring slider, FIG. 20A is a top view of the spring slider, and FIG. 20B is a side view of the spring slider. As shown in FIGS. 19 and 20, the spring slider 8 is provided with a side wall portion 8b and a flat surface portion 8c extending vertically from the upper side of the side wall portion 8b. Further, a pair of fixed end positioning portions 8a formed in a hook shape are provided at the tips extending vertically from both sides of the lower side of the side wall portion 8b. The tip of the flat surface portion 8c facing the side wall portion 8b has a slope portion 8d gradually extending away from the side wall portion 8b in the direction in which the pair of fixed end positioning portions 8a face each other.

21 is a perspective view showing a fixed part, and FIG. 22 is a front view of the fixed part. The fixing part 4 is bent so as to face each other at both ends of the fixing portion 4a to which the fixed joint iron 41a is fixed, the back surface portion 4b extending upward from the fixing portion 4a and opening at the center, and the back surface portion 4b. It has a pair of side surface portions 4c. A slide hole 4e is formed in the back surface portion 4b of the fixing component 4 so that the pair of side surface portions 4c extend in the opposite directions. A pair of insertion holes 4f are formed in the back surface portion 4b of the fixing component 4 so that the pair of side surface portions 4c are arranged in a direction facing each other below the slide hole 4e.

Further, a plurality of rivet holes into which the rivets 41e are inserted are formed in the fixing portion 4a. Further, the pair of side surface portions 4c are provided with a shaft hole into which the rotation shaft 5 of the movable piece 1 is inserted.

23 is a perspective view showing the adjustment component, FIG. 24A is a top view of the adjustment component, FIG. 24B is a side view of the adjustment component, and FIG. 24C is a bottom view of the adjustment component. The adjusting component 9 has a side surface portion 9b, an operation knob portion 9a extending vertically from above the side surface portion 9b, and a protruding portion 9c extending vertically from the side surface portion 9b below the operation knob portion 9a. Further, the adjusting component 9 has a contact portion 9d that is inclined with respect to the side surface portion 9b and abuts on the contact portion 9d of the spring slider 8 on the opposite surface of the side surface portion 9b. The contact portion 9d of the adjusting component 9 is inclined with respect to the side surface portion 9b at the same angle as the slope portion 8d of the spring slider 8.

The adjusting component 9 is attached to the fixing component 4 so as to be movable along the extending direction of the slide hole 4e. In the adjusting component 9, the operation knob portion 9a is in contact with the upper side of the back surface portion 4b of the fixing component 4, and the protruding portion 9c is inserted into the slide hole 4e. That is, the adjusting component 9 is attached so as to sandwich the upper side of the back surface portion 4b of the fixing component 4 and the slide hole 4e. In the spring slider 8, the slope portion 8d is in contact with the contact portion 9d of the adjustment component 9 in a state where the adjustment component 9 is attached to the fixing component 4, and a part of the flat surface portion 8c is inserted into the slide hole 4e. .. Further, the pair of fixed end positioning portions 8a of the spring slider 8 are inserted into the pair of insertion holes 4f of the fixed component 4, respectively.

As shown in FIG. 17, the slope portion 8d of the spring slider 8 is provided so as to gradually approach the load side terminal 25 side from the power supply side terminal 24 side in the direction in which the pair of fixed end positioning portions 8a face each other. The adjusting component 9 slides along the extended direction of the slide hole 4e of the fixed component 4 by moving the operation knob 9a up and down the paper surface of FIG. By this slide, the slope portion 8d of the spring slider 8 is pushed by the contact portion 9d of the adjusting component 9, and the spring slider 8 moves to the load side terminal 25 side or the power supply side terminal 24 side. That is, the spring slider 8 has a structure that can be slid from the power supply side terminal 24 toward the load side terminal 25 or from the load side terminal 25 toward the power supply side terminal 24 by the adjusting component 9.

FIG. 25 is a top view of the tripping device when the adjusting component is moved substantially to the center in the width direction. FIG. 26 is a top view of the tripping device when the adjusting component is further moved. In this state, since the fixed end 2b of the movable piece spring 2 is further moved in the direction of the load side terminal 25, the urging force on the movable piece 1 increases, and the movable piece 1 moves until a larger electromagnetic force acts. do not have. As a result, the instantaneous tripping current can be increased.

Here, the fixed end 2b of the movable single spring 2 always urges the spring slider 8 toward the power supply side terminal 24, and the adjusting component 9 is subjected to a load that slides downward in FIG. 25. It is preferable that the adjusting component 9 is set so as not to move due to vibration or the like by adjusting the friction coefficient of the portion in contact with the fixing component 4 or the spring slider 8.

Here, the spring slider 8 is preferably made of a synthetic resin material. As a result, even after the inspection in which the operating current is checked, the spring slider 8 is prevented from becoming hot, and the operator can safely unlock the spring slider 8 and the fixing component 4 without providing a cooling time. be able to.

As described above, in the circuit breaker 102 according to the present embodiment, the tripping device 60 includes the spring slider 8, and the spring slider 8 locks the fixed end 2b extending from the coil portion 2c of the movable single spring 2. It has a fixed end positioning portion 8a and a slope portion 8d extending from the power supply side terminal 24 so as to gradually approach the load side terminal 25, and engages with the back surface portion 4b of the fixed component 4 at any position of the slope portion 8d. It will be stopped. When adjusting the operating current, the spring slider 8 is moved to change the position of the slope portion 8d locked to the fixed component 4, thereby changing the load urged by the movable piece spring 2 to the movable piece 1. do.

In this way, while the fixed end 2b of the movable single spring 2 is locked to the spring slider 8, the spring slider 8 is moved and locked with the fixed component at an arbitrary position on the slope of the spring slider. The load of the movable single spring 2 can be changed without using a jig for holding and moving the fixed end 2b of the movable single spring 2, and the efficiency of the work of adjusting the operating current is improved. Further, it is possible to prevent the pair of fixed ends 2b of the movable single spring 2 from being fixed at different positions from each other, and to set the intended load. Further, the load of the movable single spring 2 can be changed without directly touching the movable single spring 2, and the operating current of the instantaneous detachment can be easily changed. Further, since the operating current is adjusted without moving the initial position of the movable piece 1, the adjustment range can be increased while keeping the distance between the movable piece 1 and the main contact opening / closing mechanism constant. Further, in the present embodiment, the load of the movable single spring 2 can be gradually changed by sliding the spring slider 8, and the optimum load can be set according to the operating current.

In the first to third embodiments, the fixed contact 27 is connected to the power supply side terminal 24 and the movable contactor 23 is connected to the load side terminal 25, but the movable contactor is connected to the power supply side terminal 24. 23 may be connected and the fixed contact 27 may be connected to the load side terminal 25.

Further, in the first to third embodiments, the movable single spring 2 is a double torsion spring, but it may be a single torsion spring.

Further, in the first to third embodiments, the example in which the rotating shaft 5 is inserted through the movable piece 1 is shown, but it is sufficient as long as the movable piece 1 is rotatable, and the rotating shaft 5 is not used. It is also possible.

Further, in the first to third embodiments, the example in which the fixed component 4 and the rotating shaft 5 are separate members is shown, but the rotating shaft 5 that rotatably supports the movable piece 1 with a part of the fixed component 4. May be configured.

Further, in the present disclosure, within the scope of the invention, each embodiment can be freely combined, and each embodiment can be appropriately changed or omitted.

1 Movable piece, 1a Suctioned part, 1b Arm part, 1c Operation piece part, 2 Movable piece spring, 2a Movable end, 2b Fixed end, 2c Coil part, 3 Spring holder, 3a Fixed end positioning part, 3b Mounting groove, 3c Flat part, 3d side part, 4 fixing part, 4a fixing part, 4b back part, 4c side part, 4d mounting part, 4e slide hole, 4f insertion hole, 5 rotation shaft, 6 conductive member, 7 thermal element, 8 Spring slider, 8a fixed end positioning part, 8b side wall part, 8c flat surface part, 8d slope part, 9 adjustment parts, 9a operation knob part, 9b side surface part, 9c protrusion part, 9d contact part, 10 housing, 11 base, 12 Cover, 12a Window hole for handle, 20 Circuit breaker unit, 21 Fixed contact, 22 Movable contact, 23 Movable contact, 24 Power supply side terminal, 25 Load side terminal, 26 Movable contact holder holder, 30 Open / close mechanism, 31 Operation Handle, 32 crossbar, 33 trip bar, 40 stripping device, 41 electromagnetic stripping device, 41a fixed joint iron, 42 thermal stripping device, 42a heater, 50 arc extinguishing device, 60 stripping device, 100, 101, 102 circuit breaker

Claims (9)

A conductive member provided between a fixed contact connected to one of the connection terminals, a movable contact provided so as to be able to contact and release the fixed contact, and the one connection terminal and the other connection terminal. A circuit breaker that is assembled in a circuit breaker and includes a tripping device that drives an opening / closing mechanism that opens and closes the fixed contact and the movable contact when an overcurrent flows through the conductive member.
The detaching device is
A fixed component to which a fixed joint iron that is magnetized by an overcurrent flowing through the conductive member is fixed,
A movable piece having a suctioned portion facing the fixed joint iron and rotatably supported,
A movable piece spring having a coil portion, a movable end extending unilaterally from the coil portion, abutting on the movable piece, and urging the suctioned portion in a direction to separate the suctioned portion from the fixed joint iron.
A plurality of mounting grooves arranged in a direction from the one connection terminal side to the other connection terminal side, having a fixed end positioning portion for locking the fixed end extending from the coil portion of the movable single spring to the other. A circuit breaker comprising a spring holder that is locked to the fixing component in any of the above. The movable single spring has a pair of coil portions, and the spring holder has a pair of fixed end positioning portions for locking a pair of fixed ends extending from the pair of coil portions of the movable single spring to the other. The circuit breaker according to claim 1. The circuit breaker according to claim 1 or 2, wherein the spring holder is made of a synthetic resin. The spring holder has flat surfaces provided at intervals from each other, and the plurality of mounting grooves are formed on one side of the flat surface and face from one side toward the other side. The circuit breaker according to any one of claims 1 to 3, wherein the circuit breaker is extended. The fixing component is characterized in that a mounting portion that is a through hole is formed, the flat surface portion is inserted into the mounting portion, and any of the plurality of mounting grooves of the spring holder is engaged with the mounting portion. The circuit breaker according to claim 4. 13. The circuit breaker according to any one of the following items. The circuit breaker according to claim 6, wherein the spring holder is supported by a support spring attached to the opposite surface of the flat surface portion on the opposite surface to which the plurality of convex portions are provided. A conductive member provided between a fixed contact connected to one of the connection terminals, a movable contact provided so as to be able to contact and release the fixed contact, and the one connection terminal and the other connection terminal. A circuit breaker that is assembled in a circuit breaker and includes a tripping device that drives an opening / closing mechanism that opens and closes the fixed contact and the movable contact when an overcurrent flows through the conductive member.
The detaching device is
A fixed component to which a fixed joint iron that is magnetized by an overcurrent flowing through the conductive member is fixed,
A movable piece having a suctioned portion facing the fixed joint iron and rotatably supported,
A movable piece spring having a coil portion, a movable end extending unilaterally from the coil portion, abutting on the movable piece, and urging the suctioned portion in a direction to separate the suctioned portion from the fixed joint iron.
A slope portion having a fixed end positioning portion for locking a fixed end extending from the coil portion of the movable single spring to the other, and extending gradually from the one connection terminal side to the other connection terminal side. A circuit breaker comprising a spring slider that is locked to the fixing component at any position. The fixing component is formed with a slide hole into which a part of the slope portion of the spring slider is inserted, and the slide hole is provided with an adjustment component that abuts on the slope portion of the spring slider. The circuit breaker according to claim 8, wherein the spring slider is moved to the one connection terminal side or the other connection end side child side by moving the component along the slide hole.

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