JP2011018460A - Circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To share a component between a voltage trip device and an undervoltage trip device.SOLUTION: A trip bar 2 of a switching mechanism 300 in an air circuit breaker 100 is provided with a trip bar cut groove 2a and a trip bar extension 2b, wherein, in the case of an L-shaped plunger 6 of the voltage trip device 3, both ends of the trip bar cut groove 2a are pushed and moved, and in the case of a T-shaped plunger 8 of the undervoltage trip device 4, the trip bar extension 2b is pushed and moved, thereby sharing components other than the plunger.

Description

  The present invention relates to a structure of a circuit breaker tripping device.

  Conventionally, an air circuit breaker has been provided with a voltage trip device as an accessory device. The voltage tripping device is arranged adjacent to the trip bar of the opening / closing mechanism, and the plunger is pushed out from the inside of the coil when a voltage exceeding a predetermined level is applied to the coil provided in the voltage tripping device. In this case, the circuit breaker can be turned off by the plunger pushing and moving the trip bar.

  Contrary to the voltage trip device, the plunger is pulled into the electromagnetic coil in a state where a voltage higher than a predetermined value is applied, but the applied voltage is less than a predetermined voltage (or no voltage). There is also provided an undervoltage tripping device that turns off the circuit breaker by pushing the plunger out of the coil and moving the trip bar when the state is reached (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2000-3685 (page 3-4, FIG. 4, FIG. 6)

  In the voltage trip device, it is necessary to push out the plunger when a voltage is applied to the coil, and to pull the plunger in a state of insufficient voltage. On the other hand, in the undervoltage tripping device, the plunger is pulled in when a voltage is applied, and the plunger needs to be pushed out in the state of undervoltage. Therefore, since different coils are used for the voltage tripping device and the undervoltage tripping device, there is a problem that the number of parts increases and the assembly process becomes complicated.

  The present invention has been made to solve the above-described problems, and has an object to share components by minimizing the difference between a voltage trip device and an undervoltage trip device. Is.

  In the circuit breaker of the present invention, the trip bar has a first lever portion extending around the rotation shaft, and a second lever extending on the opposite side across the first lever portion and the rotation shaft. And the plunger of the voltage trip device is prevented from interfering with the first lever portion even if it is pushed out of the coil.

  According to the present invention, the voltage tripping device and the undervoltage tripping device can be configured only by changing the plunger, so that other components can be shared.

It is a sectional side view of the air circuit breaker which attached the voltage tripping device in Embodiment 1 of this invention. It is a sectional side view which shows the state which operated the air circuit breaker with the voltage tripping device in Embodiment 1 of this invention. It is a side view of the voltage trip device in Embodiment 1 of this invention. It is sectional drawing of the voltage trip device in Embodiment 1 of this invention. It is a top view of the voltage tripping device in Embodiment 1 of this invention. It is the perspective view which showed the outline of the shape of the L-shaped plunger and trip bar of the voltage trip device in Embodiment 1 of this invention. It is a front view of the air circuit breaker which attached the undervoltage trip device in Embodiment 1 of this invention. It is a sectional side view which shows the state which operated the air circuit breaker with the undervoltage trip device in Embodiment 1 of this invention. It is a front view of the undervoltage trip device in Embodiment 1 of this invention. It is the perspective view which showed the outline of the T-shaped plunger of the undervoltage trip device in Embodiment 1 of this invention, and the shape of a trip bar. It is a side view of the voltage trip device in Embodiment 2 of this invention. It is the perspective view which showed the outline of the shape of the plunger part and trip bar of the voltage tripping device in Embodiment 2 of this invention.

Embodiment 1 FIG.
FIG. 1 is a side sectional view of an air circuit breaker 100 to which a voltage trip device 3 according to Embodiment 1 of the present invention is attached. In FIG. 1, the air circuit breaker 100 includes an opening / closing contact part 200 and an opening / closing mechanism part 300. The switching contact portion 200 is housed in a base housing 1 made of an insulating material, and is connected to the switching mechanism portion 300 for opening and closing the contact portion.

  The trip bar 2 is a component of the opening / closing mechanism unit 300. By pushing and rotating the trip bar 2 in a predetermined direction, the open / close mechanism 300 is driven and the open / close contact 200 is opened. As a result, the air circuit breaker 100 is turned off. The voltage trip device 3 is arranged above the trip bar 2.

  The voltage tripping device 3 is provided with an L-shaped plunger 6 having a L-shaped side section at the tip, and the tip projects from the voltage tripping device 3 downward in the figure.

  A lever portion 2b and a lever portion 2c extend from the rotation center 2a of the trip bar 2 on the left and right sides in the drawing. As will be described later, the lever portion 2b is provided with a kerf 2d, and a part of the L-shaped plunger 6 passes between the kerf 2d. FIG. 2 is a side cross-sectional view showing a state where the air circuit breaker 100 is turned off by the voltage trip device 3 according to Embodiment 1 of the present invention. As shown in FIG. 2, when the L-shaped plunger 6 pushes and moves the lever portion 2c of the trip bar 2 from the lower side in the drawing to rotate around the rotation center 2a, the opening / closing mechanism portion 300 is driven. ing.

  The lever portion 2c and the lever portion 2b are integrally formed. When the lever portion 2c is rotated in a direction around the rotation center 2a, the lever portion 2b is also rotated in the same direction. When the portion 2b is rotated, the lever portion 2c is also rotated in the same direction.

  FIG. 3 is a side view of the voltage trip device 3. In FIG. 3, the voltage tripping device 3 includes a frame 10 that covers the outside of the voltage tripping device 3, the above-described L-shaped plunger 6, and a plunger periphery that restricts the movement of the L-shaped plunger 6 in directions other than the vertical direction. A stop 7 and the like. The L-shaped plunger 6 includes a plunger portion 6a, a plunger shaft portion 6b extending vertically downward (downward in the drawing) from the plunger portion 6a, and an L-shaped plunger tip portion provided at the tip of the plunger portion 6a and having an L-shaped side section. 6c.

  FIG. 4 is a side sectional view of the voltage trip device 3. In this figure, some parts are omitted. As shown in FIG. 4, in the voltage tripping device 3, the tripping coil 5 is wound around a cylindrical bobbin 9, and a frame 10 that covers the outside of the tripping coil 5 is disposed around it. . A fixed iron core 11 is fixed inside the tripping coil 5. Further, an L-shaped plunger 6 is disposed on the inner coaxial axis of the fixed iron core 11. The L-shaped plunger 6 is linearly movable within a certain range in the vertical direction.

  A spring 12 is urged between the projection of the frame 10 and the plunger portion 6a inside the fixed iron core 11 so as to push the plunger portion 6a vertically downward. Therefore, the L-shaped plunger 6 is pushed out when no voltage is applied.

  FIG. 5 is a top view of the voltage tripping device 3 according to Embodiment 1 of the present invention. When the voltage trip device 3 is viewed from above, the frame 10 forms a substantially square shape. Moreover, the plunger part 6a is located in the center.

  FIG. 6 is a perspective view schematically showing the shapes of the L-shaped plunger 6 and the trip bar 2 of the voltage tripping device 3 according to Embodiment 1 of the present invention. The cross section of the L-shaped plunger tip 6c is a circle, but the groove width of the cut groove 2d provided in the lever portion 2b is wider than the diameter of the circle of the cross-section of the L-shaped plunger tip 6c. Yes. As a result, the L-shaped plunger 6 does not interfere with the trip bar 2 even if it moves linearly within a certain range in the vertical vertical direction.

  Next, the operation will be described. As shown in FIG. 1, when a voltage exceeding a predetermined value is not applied to the tripping coil 5, the L-shaped plunger 6 is urged by the spring 12 provided inside the tripping coil 5, and the tripping coil 5 is pulled off. The coil 5 is pushed out.

  On the other hand, when a voltage exceeding a predetermined value is applied to the voltage tripping device 3, the L-shaped plunger 6 is pulled toward the inside of the tripping coil 5 as shown in FIG. 2, and the lever portion 2c is L-shaped. Pushed and moved by the plunger tip 6c and rotated in a direction approaching the tripping coil 5 (with the lever 2b being pulled away and turned away from the coil 5 side), the opening / closing mechanism 300 is driven to open and close The contact part 200 is opened, and the air circuit breaker 100 is turned off.

  The above is description of the air circuit breaker 100 which attached the voltage trip device 3 in Embodiment 1 of this invention.

  Next, the air circuit breaker 400 to which the undervoltage trip device 4 according to Embodiment 1 of the present invention is attached will be described. The basic configuration of the air circuit breaker 400 to which the undervoltage trip device 4 is attached is the same as that of the air circuit breaker 100 to which the voltage trip device 3 is attached. The only difference between the two is the difference in the shape of the plunger.

  FIG. 7 is a front view of the air circuit breaker 400 to which the undervoltage trip device 4 according to Embodiment 1 of the present invention is attached. As shown in FIG. 7, the T-shaped plunger 8 which is the plunger of the undervoltage tripping device 4 has a reverse T-shaped tip when viewed from the front.

  FIG. 8 is a side view showing a state where air circuit breaker 400 is operated by undervoltage tripping device 4 according to Embodiment 1 of the present invention. As shown in FIG. 8, when the T-shaped plunger 6 pushes the lever portion 2b of the trip bar 2 from the upper side in the drawing and rotates around the rotation center 2a, the opening / closing mechanism portion 300 is driven.

  FIG. 9 is a front view of the undervoltage trip device 4. In FIG. 9, the undervoltage tripping device 4 moves the frame 10 that forms the appearance of the undervoltage tripping device 4, the above-described T-shaped plunger 8, and the movement of the T-shaped plunger 8 in directions other than the vertical direction. A plunger detent 7 or the like for limiting is provided. The T-shaped plunger 8 includes a plunger portion 6a, a plunger shaft portion 6b extending vertically downward from the plunger portion 6a, and a T-shape having an inverted T shape when viewed from the front. It consists of a plunger tip 8c. The plunger 6a is the same as that provided in the voltage tripping device 3, and the T-shaped plunger tip 8c is different from the L-shaped plunger tip 6c provided in the voltage tripping device 3. Yes.

  Similarly to the L-shaped plunger 6, the T-shaped plunger 8 is urged by the spring 12 in the tripping coil 5 and is pushed out of the tripping coil 5 when no voltage is applied. 5 is applied to the inside of the tripping coil 5 by applying a voltage of a predetermined value or more.

  FIG. 10 is a perspective view showing an outline of the shapes of the plunger portion and trip bar of the undervoltage trip device in Embodiment 1 of the present invention. As can be seen from FIG. 10, the T-shaped plunger 8 as a whole is shorter than the L-shaped plunger of the voltage tripping device 3 and does not reach the lever portion 2 b when it is drawn into the tripping coil 5. ing. The T-shaped plunger tip 8c is wider than the kerf 2a provided in the lever 2b.

  Next, the operation will be described. When the undervoltage tripping device 4 is attached as shown in FIG. 7, the T-shaped plunger 8 is pushed out of the tripping coil 5 in a state where a voltage exceeding a predetermined value is not applied, and the tip of the T-shaped plunger Since the portion 8c has a shape wider than the cut groove 2a, both side portions straddling the cut groove 2d provided in the lever portion 2b are pushed and moved. As a result, the trip bar 2 is rotated in a direction in which the lever portion 2b is pulled away from the coil 5 side, and the opening / closing mechanism portion 300 is driven.

  On the other hand, when a voltage exceeding a predetermined value is applied to the undervoltage tripping device 4, the T-shaped plunger 8 is pulled toward the inside of the tripping coil 5 as shown in FIG. 8, and the trip bar 2 is brought to the normal position. Since it returns, the air circuit breaker 400 can be turned on.

  As described above, according to the present embodiment, the voltage trip device 3 can be configured by using the L-shaped plunger 6 as the plunger, and the undervoltage trip device 4 can be configured by using the T-shaped plunger 8 as the plunger. And other parts can be shared.

Embodiment 2. FIG.
FIG. 11 is a side view showing a voltage trip device 32 according to Embodiment 2 of the present invention. The basic configuration is the same as that of the voltage tripping device 3 in the first embodiment, but the shape of the plunger 62 is different.

  In Embodiment 1, the trip bar 2 is provided with the kerf 2d, so that the plunger 6 is wound around the lower side of the trip bar 2.

  On the other hand, the plunger 62 of the voltage tripping device 32 in the second embodiment has a shape in which the plunger tip 62c bypasses the trip bar 20 and wraps around the lower side of the trip bar 20. Unlike the first embodiment, it is not necessary to provide a cut groove in the trip bar 20 by making the plunger tip 62c in such a shape.

  As described above, according to the present embodiment, the voltage tripping device 32 can be configured by using the plunger 62 as the plunger without providing a kerf in the trip bar 20, and the undervoltage pulling can be achieved by using the T-shaped plunger 8 as the plunger. The removal device 4 can be configured, and other parts can be shared.

  In the present embodiment, when the undervoltage tripping device is configured by changing the plunger of the voltage tripping device 32, the shape of the plunger tip does not necessarily need to be T-shaped, and a rod-like plunger is used. It is enough.

  In Embodiments 1 and 2, the plunger is pulled into the coil when a voltage of a predetermined value or more is applied to the coil. Instead, when a voltage of a predetermined value or more is applied to the coil. The plunger may be pushed out of the coil. For example, when a voltage exceeding a predetermined value is not applied to the coil, the plunger to be pushed out by the biasing force of the spring is suppressed by the attractive force of the permanent magnet, but when a voltage exceeding the predetermined value is applied to the coil. The magnetic flux of the permanent magnet may be canceled out by the magnetic flux generated by the coil, and the biasing force of the spring may overcome the attractive force of the permanent magnet and the plunger may be pushed out of the coil.

  1 Base housing, 2 Trip bar, 2a Rotation center, 2b Lever part, 2c Lever part, 2d Groove, 3 Voltage trip device, 4 Undervoltage trip device, 5 Trip coil, 6 L-shaped plunger, 6a Plunger part, 6b Plunger shaft part, 6c L-shaped plunger tip, 7 Plunger detent, 8 T-shaped plunger, 8c T-shaped plunger tip, 9 Bobbin, 10 Frame, 11 Fixed iron core, 12 Spring, 20 Trip Bar, 62 Plunger, 62c Plunger tip, 32 Voltage trip device, 100 Air circuit breaker, 200 Opening / closing contact part, 300 Opening / closing mechanism part 400 Air circuit breaker.

Claims (3)

A coil to which a voltage is applied;
A plunger provided inside the coil and partially protruding from the coil, depending on the voltage applied to the coil, pushed out of the coil or pulled into the coil;
A first lever portion extending from the rotation center, and a second lever portion extending from the rotation center on the opposite side across the rotation center and the first lever portion, around the rotation center A trip bar that drives the opening and closing mechanism by rotating in the direction in which the first lever part moves away from the coil side or in the direction in which the second lever part approaches the coil,
Even if the plunger is pushed out of the coil, it does not interfere with the first lever portion, and when the plunger is pulled into the coil, the second lever portion is pushed from the opposite side across the trip bar of the coil. And the trip bar is rotated in a direction to bring the second lever portion closer to the coil.   The first lever part is provided with a kerf, and the plunger passes through the kerf so that the plunger does not interfere with the first lever part even if the plunger is pushed out of the coil. The circuit breaker according to claim 1. A coil to which a voltage is applied;
A plunger provided inside the coil and partially protruding from the coil, depending on the voltage applied to the coil, pushed out of the coil or pulled into the coil;
A first lever portion extending from the rotation center, and a second lever portion extending from the rotation center on the opposite side across the rotation center and the first lever portion, around the rotation center A trip bar that drives the opening and closing mechanism by rotating in the direction in which the first lever part moves away from the coil side or in the direction in which the second lever part approaches the coil,
The plunger does not interfere with the second lever portion even when the plunger is pulled into the coil, and the first lever portion is pushed from the coil side when the plunger is pushed out from the coil. The circuit breaker characterized by rotating said trip bar in the direction which keeps a lever part away from said coil side.

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