JP5054648B2 - Circuit breaker - Google Patents

Description

  The present invention relates to an opening / closing mechanism of a circuit breaker, and more particularly to a trip bar structure.

  In a conventional circuit breaker, for example, as shown in Patent Document 1, a trip bar that is rotatably held by a frame of an opening / closing mechanism portion has a small diameter portion and a large diameter portion on a rotation shaft portion, When assembling into a frame, it is known to hold the small-diameter portion by fitting the small-diameter portion into the notch of the frame and then sliding the rotary shaft portion in the axial direction and fitting the large-diameter portion into the shaft hole of the frame.

Japanese Patent Laid-Open No. 62-177825, FIG.

  In the conventional trip bar configured as described above, the rotation shaft that fits into the shaft hole of the frame is connected between the left and right frames, and a contact portion with the latch is provided at this connection portion, and the magnitude of the current is increased. When the overload current flows, the tripping device rotates the trip bar and operates the latch with which the trip bar abuts to operate (trip) the opening / closing mechanism. For this reason, when configuring the opening / closing mechanism, handle arms and main springs (hereinafter also simply referred to as components) that operate during the opening / closing operation are prevented from interfering with the rotating shaft of the trip bar. Therefore, it is necessary to arrange the components so that the rotation axis of the trip bar is not arranged on the component operation trajectory, and there is a problem that the opening / closing mechanism portion cannot be reduced in size.

  The present invention has been made to solve the above-described problems, and is intended to solve the above-described problems, and the operation axis of the component parts of the opening / closing mechanism that operates the rotating shaft of the trip bar during the opening / closing operation of the handle arm, the main spring, etc. It is an object of the present invention to obtain a circuit breaker that can reduce the size of the opening / closing mechanism.

  The circuit breaker of the present invention detects the magnitude of the current, and when an overload current flows, the trip device turns the trip bar and opens and closes by operating the latch that the trip bar is in contact with. In the circuit breaker that operates (trips) the mechanism part, the trip bar has a contact part with the tripping device and one end connected to the contact part, and projects in a direction perpendicular to the contact part. A pair of protrusions arranged opposite to each other with a predetermined space between each other, and the side surfaces of the pair of protrusions are respectively incorporated into shaft holes of the mechanism frame of the opening / closing mechanism part to rotate the trip bar. A rotating shaft portion that supports movement is formed, and at least one protrusion tip is formed with an abutting portion with a latch that abuts against a latch that restricts the rotation of the trip bar. You In the space recess, in which operation trajectories of the opening and closing operation of the components of the switching mechanism portion is present and configured to position the rotating shaft of the trip bar on said operating trajectory.

  According to the circuit breaker of the present invention, the movement locus of the component parts of the opening / closing mechanism that operates during the opening / closing operation of the handle arm, the main spring, etc. is present in the space recess formed by the pair of protrusions. Since the trip bar rotating shaft portion can be arranged on the operation locus, a circuit breaker having a miniaturized opening / closing mechanism portion can be obtained.

  The above-described and other objects, features, and effects of the present invention will become more apparent from the detailed description and the drawings in the following embodiments.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each figure, the same code | symbol shall show the same or an equivalent part.
Embodiment 1 FIG.
1 is a perspective view showing an external appearance of a circuit breaker according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing an opening / closing mechanism portion and a tripping device with a cover removed, and FIG. 3 is an on state. FIG. 4 is a perspective view showing the opening / closing mechanism and the tripping device, and FIG. 4 is a perspective view showing the opening / closing mechanism and the tripping device in the trip state.
1 and 2, the circuit breaker 100 includes an opening / closing mechanism 200, a tripping device 300, a switching contact (not shown), and an arc extinguishing device (not shown). Is housed in a base housing 1 comprising a base 1b and a middle base 1a formed of an insulating material, and an opening / closing mechanism 200, a tripping device 300, and an opening / closing contact are fixedly held on the middle base 1a. 3 and 4, the magnitude of the current is detected, and when the overload current flows, the bimetal part 2 of the tripping device 300 is bent and the trip bar 3 of the opening / closing mechanism part is operated, By operating the latch 4 with which the trip bar 3 is in contact, the switching mechanism 200 is tripped, and the fixed contact 5 and the movable contact 6 of the switching contact are separated.
In addition, when a short-circuit current flows, a large magnetic force is generated in the coil unit 7 of the tripping device 300, the movable iron core 8 operates, and the movable iron core 8 operates the latch 4, thereby opening / closing mechanism unit 200. Is tripped, and the fixed contact 5 and the movable contact 6 of the switching contact portion are separated.

5 is a perspective view showing an ON state of the switching mechanism of the circuit breaker according to Embodiment 1 of the present invention, FIG. 6 is a side sectional view showing the ON state of the switching mechanism, and FIG. 7 is an OFF state of the switching mechanism. 8 is a side sectional view showing an off state in the opening / closing mechanism section, FIG. 9 is a perspective view showing a trip state in the opening / closing mechanism section, and FIG. 10 is a side sectional view showing a trip state in the opening / closing mechanism section. .
As shown in FIGS. 5 to 10, in the opening / closing mechanism unit 200, the component link (upper) 9 and the link (lower) 10 are arranged in the direction of the power supply side terminal-load side terminal (the left-right direction shown in the side sectional view). The main spring 11 is hung on the main spring hooking portion 12a of the handle arm 12 and the connect pin 13 that connects the link (upper) 9 and the link (lower) 10 to the power source side terminal-load side terminal direction (side). It is arrange | positioned in the left-right direction shown in sectional drawing.

11 is a perspective view showing a trip bar in an opening / closing mechanism portion of a circuit breaker according to Embodiment 1 of the present invention, FIG. 12 is a perspective view showing an ON state of a trip bar and a latch in the opening / closing mechanism portion, and FIG. 13 is an opening / closing mechanism. FIG. 14 is a perspective view showing the trip state of the trip bar and the latch in the opening / closing mechanism, and FIG. 15 shows the trip state of the trip bar and the latch in the opening / closing mechanism. It is a sectional side view.
As shown in FIG. 11, the trip bar 3 has a contact part 3a with the bimetal part 2 of the tripping device 300 and a rotating shaft part 3b, and the contact part 3a and one end are connected to the contact part 3a. The projections 3c are connected and project in a direction perpendicular to the contact portion 3a (vertical direction), and are arranged in a predetermined space so as to face each other. A rotation shaft portion 3b that is incorporated in the shaft hole 14a of the mechanism frame 14 and supports the rotation of the trip bar 3 is provided on the side surface of the tip portion of each protrusion portion 3c, and at least one of the protrusion portions 3c. An abutting portion 3d with a latch that abuts on the latch 4 that restricts the rotation of the trip bar 3 is formed at the tip of the trip bar 3.

  As shown in FIGS. 12 to 15, in the trip bar 3 and the latch 4, when the trip bar 3 and the latch 4 are in the on state, the contact part 3 d of the trip bar 3 with the latch and the contact part 4 a of the trip bar of the latch 4 come into contact. However, when an overload current flows, the bimetal part 2 is bent and a load is generated in the contact part 3a with the bimetal part 2, and the trip bar 3 is centered on the rotating shaft part 3b. The latch 4 that rotates in the clockwise direction is in contact with the trip bar and a load is generated on the contact portion 4a. The latch 4 rotates counterclockwise around the rotation shaft portion 4b of the latch, and the opening / closing mechanism portion. 200 performs a trip operation.

Here, according to the circuit breaker of the first embodiment, the rotating shaft portion 3b of the trip bar 3 is formed on the side surface of the distal end portion of the pair of protruding portions 3c arranged to face each other with a space therebetween. Since the pair of protrusions 3c are inserted into the mechanism frame and each rotation shaft part 3b is incorporated into the shaft hole 14a of the mechanism frame 14, the rotation of the trip bar 3 is supported. The space between 3c is recessed, and other parts can be placed in the space.
That is, when the circuit breaker 100 trips, the main bar 11 and the handle arm 12 that are components of the opening / closing mechanism 200 move from the position in the ON state to the position in the trip state on the trip path 3. The rotating shaft part 3b can be arrange | positioned.

  FIG. 16 is a perspective view showing the opening / closing mechanism 200 in a state where the trip bar rotating shaft 3b is on the operation locus of the main spring 11 and the handle arm 12 by the opening / closing operation of the circuit breaker according to the first embodiment of the present invention. 17 is a side sectional view showing the opening / closing mechanism 200 in a state where the trip bar rotating shaft 3b is on the operation locus of the main spring 11 and the handle arm 12 by opening / closing operation of the circuit breaker.

  As described above, according to the circuit breaker of the first embodiment of the present invention, the power supply side terminal − is provided rather than the rotating shaft portion 3b of the trip bar 3 being arranged avoiding the operation locus of the main spring 11 and the handle arm 12. Since the distance occupied by the switching mechanism 200 in the load side terminal direction can be reduced, the switching mechanism 200 can be downsized and the circuit breaker 100 can be downsized.

Embodiment 2. FIG.
18 shows a circuit breaker according to Embodiment 2 of the present invention, and is a cross-sectional view showing trip bar 3 and mechanism frame 14 taken along line XX of FIG.
In the circuit breaker according to Embodiment 2 of the present invention, the trip bar 3 is made of a resin that is an elastic member.
That is, the trip bar 3 is made of resin, and the protrusion 3c having the rotation shaft portion 3b at the tip is elastically deformed and bent.

  According to the second embodiment, the elastic deformation causes the protrusion 3c having the rotation shaft 3b at the tip of the trip bar 3 to bend in the arrow (⇒) direction, so that the trip bar 3 is moved in the arrow (→) direction. When it is inserted and assembled into the shaft hole 14a of the mechanism frame 14, the protrusion 3c is deflected and the trip bar 3 operates smoothly. Therefore, the trip bar 3 can be easily inserted into the mechanism frame 14, so that the opening / closing mechanism 200 can be easily assembled.

Embodiment 3 FIG.
19 to 21 illustrate a circuit breaker according to a third embodiment of the present invention. FIG. 19 is a perspective view showing the trip bar 3 of the circuit breaker. FIG. 20 is a diagram illustrating the insertion of the trip bar of the circuit breaker. FIG. 21 is a sectional view showing the trip bar 3 and the mechanism frame 14 along the line XX of FIG.
The circuit breaker according to the third embodiment of the present invention is the same as the circuit breaker according to the second embodiment, as shown in FIGS. 19 and 21, assembling the protrusion 3 c having the rotary shaft 3 b at the tip of the trip bar 3. In this case, a slope 3e is provided at the tip of the projection 3c in the direction of insertion into the mechanism frame 14.

  According to the third embodiment, the elastic deformation causes the protrusion 3c having the rotation shaft 3b of the trip bar 3 to be bent at the tip, and the trip bar 3 is inserted in the direction of the arrow (→) to Even when the center positions of the trip bar 3 and the mechanism frame 14 are slightly deviated when assembled in the shaft hole 14a, the slope 3e at the tip of the protrusion 3c of the trip bar 3 serves as an insertion guide surface, and the trip bar 3 is used as the mechanism frame. 14, the opening / closing mechanism 200 can be easily assembled.

Embodiment 4 FIG.
22 is an exploded perspective view of an opening / closing mechanism for inserting a trip bar of a circuit breaker according to Embodiment 4 of the present invention, and FIG. 23 is a trip bar 3 and mechanism frame 14 taken along line XX of FIG. 10 of the circuit breaker. FIG.
The circuit breaker according to the fourth embodiment of the present invention is the circuit breaker according to the second embodiment, in which the trip bar 3 is inserted when the mechanism frame 14 is assembled as shown in FIGS. An inclined surface 14b is provided on the end face of the mechanism frame 14.

  According to the fourth embodiment, the elastic deformation causes the protrusion 3c having the rotation shaft portion 3b of the trip bar 3 to bend at the tip, and the trip bar 3 is inserted in the direction of the arrow (→) to Even when the center positions of the trip bar 3 and the mechanism frame 14 are slightly shifted when assembled in the shaft hole 14a, the inclined surface portion 14b of the mechanism frame 14 serves as an insertion guide surface, and the trip bar 3 can be easily inserted into the mechanism frame 14. Therefore, the opening / closing mechanism 200 can be easily assembled.

It is an external appearance perspective view of the circuit breaker in Embodiment 1 of this invention. It is a perspective view which shows the opening-closing mechanism part and the tripping device in the state which removed the cover of the circuit breaker in Embodiment 1 of this invention. It is a see-through | perspective perspective view which shows the switching mechanism part and tripping device in the ON state of the circuit breaker in Embodiment 1 of this invention. It is a see-through | perspective perspective view which shows the switching mechanism part and tripping device in the trip state of the circuit breaker in Embodiment 1 of this invention. It is a perspective view which shows the opening / closing mechanism part in the ON state of the circuit breaker in Embodiment 1 of this invention. It is a sectional side view which shows the switching mechanism part in the ON state of the circuit breaker in Embodiment 1 of this invention. It is a perspective view which shows the opening / closing mechanism part in the OFF state of the circuit breaker in Embodiment 1 of this invention. It is a sectional side view which shows the switching mechanism part in the OFF state of the circuit breaker in Embodiment 1 of this invention. It is a perspective view which shows the switching mechanism part in the trip state of the circuit breaker in Embodiment 1 of this invention. It is a sectional side view which shows the switching mechanism part in the trip state of the circuit breaker in Embodiment 1 of this invention. It is a perspective view which shows the trip bar of the circuit breaker in Embodiment 1 of this invention. It is a perspective view which shows the trip bar and latch in the ON state of the circuit breaker in Embodiment 1 of this invention. It is a sectional side view which shows the trip bar and latch in the ON state of the circuit breaker in Embodiment 1 of this invention. It is a perspective view which shows the trip bar and latch in the trip state of the circuit breaker in Embodiment 1 of this invention. It is a sectional side view which shows the trip bar and latch in the trip state of the circuit breaker in Embodiment 1 of this invention. It is a perspective view which shows the opening-and-closing mechanism part in the state which has the operation locus of a main spring and a handle arm on the trip bar rotating shaft of the circuit breaker in Embodiment 1 of this invention. It is a sectional side view which shows the opening-closing mechanism part in the state which has the operation locus of a main spring and a handle arm on the trip bar rotating shaft of the circuit breaker in Embodiment 1 of this invention. It is sectional drawing which shows the trip bar and flame | frame in the XX line of FIG. 10 of the circuit breaker in Embodiment 2 of this invention. It is a perspective view which shows the trip bar of the circuit breaker in Embodiment 3 of this invention. It is a disassembled perspective view of the opening-and-closing mechanism part which inserts the trip bar of the circuit breaker in Embodiment 3 of this invention. It is sectional drawing which shows the trip bar and flame | frame in the XX line of FIG. 10 of the circuit breaker in Embodiment 3 of this invention. It is a disassembled perspective view of the opening-closing mechanism part which inserts the trip bar of the circuit breaker in Embodiment 4 of this invention. It is sectional drawing which shows the trip bar and flame | frame in the XX line of FIG. 10 of the circuit breaker in Embodiment 4 of this invention.

Explanation of symbols

1 Base housing, 1a base, 1b Middle base, 2 Bimetal part,
3 Trip bar, 3a Abutting part with bimetal part, 3b Rotating shaft part,
3c Projection part, 3d Contact part with latch, 3e Slope part,
4 latch, 4a contact part with trip bar, 4b rotating shaft part,
5 fixed contact, 6 movable contact, 7 coil part, 8 movable iron core, 9 link (top),
10 link (bottom), 11 main spring, 12 handle arm,
12a Main spring hook, 13 Connect pin, 14 Mechanism frame,
14a Axle hole, 14b Slope,
100 circuit breaker, 200 switching mechanism, 300 trip device

Claims (4)

  Circuit breaker that detects the magnitude of current and trips the trip bar when overload current flows, and operates the switch mechanism by operating the latch that the trip bar contacts The trip bar has a contact portion with the tripping device and one end connected to the contact portion, protrudes in a direction perpendicular to the contact portion, and is opposed to each other with a predetermined space therebetween. A pair of projecting portions, and on each of the side surfaces of the paired projecting portions, a rotating shaft portion that is incorporated in a shaft hole of a mechanism frame of the opening / closing mechanism portion and supports the rotation of the trip bar is formed, In addition, a contact portion with a latch that contacts the latch that restricts the rotation of the trip bar is formed at the tip of at least one projection portion, and a configuration of the opening / closing mechanism portion is formed in a space recess formed by the pair of projection portions parts There are operation trajectories of the opening and closing operation, the circuit breaker being characterized in that to arrange the rotation shaft portion of the trip bar on said operating trajectory.   2. The circuit breaker according to claim 1, wherein the trip bar is made of resin, and the protrusion having the rotation shaft at the tip is elastically bent and incorporated into the mechanism frame.   The circuit breaker according to claim 2, wherein a slope is provided at a tip of the protrusion.   The circuit breaker according to claim 2, wherein an inclination is provided on an end face of the mechanism frame that passes when the rotating shaft portion of the protrusion is assembled into the mechanism frame shaft hole.

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