JP2011003304A - Circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that, in a conventional circuit breaker, strong shock accompanying high-speed movement of a movable electrode and a coupling mechanism driving for it at the time of open-electrode action is generated, and a counter to count the number of open-electrode actions makes miscounting.SOLUTION: By using a twisted spring for a coupling part connecting a counter and a coupling mechanism mechanically, rotating a supporting tool penetrating a coil part of the twisted spring as a rotation center, and floating an end of the twisted spring from a lever at the time of colliding the lever to a topper, shock and vibration to the counter is alleviated to eliminate miscounting.

Description

  The present invention relates to a circuit breaker used for power distribution facilities and the like, and more particularly to a circuit breaker including a counter for counting the number of switching operations.

  For example, the counter 38 provided in the conventional vacuum circuit breaker includes a display plate 36 (open and closed states) that is rotatably connected to a shaft 62 attached to a lever 96 that moves when the vacuum circuit breaker is turned on. The counter lever 150 is rotated by a predetermined angle (about 45) in conjunction with the movement of the lever 96 through a lever 140 with a spring 148 attached thereto and a spring 148 rotatably connected to the lever 140. The counter display is advanced by one unit (for example, see Patent Document 1).

JP 2004-152625 A (FIGS. 3 and 4)

  The counter used in the conventional circuit breaker has a possibility that the counter erroneously counts due to the impact and vibration generated by the high-speed opening operation of the movable electrode and the connecting mechanism for driving the movable electrode. In order to avoid this, in the conventional circuit breaker, the counter display is displayed by rotating the counter lever by a predetermined angle in conjunction with the slow movement of the connecting mechanism when storing the closing spring. Advanced one unit. Therefore, the conventional circuit breaker has a problem that it is difficult to reliably advance the display unit of the counter during the opening operation.

  An object of the present invention is to solve the above-mentioned problems, and to obtain a circuit breaker having a counter that mitigates shock and vibration transmitted to a connecting portion with the counter during high-speed opening operation and does not cause erroneous counting. And

  The circuit breaker according to the present invention includes a fixed conductor and a movable conductor arranged opposite to each other, a coupling mechanism that moves the movable conductor and opens or closes it electrically by contacting and separating from the fixed conductor, and the coupling mechanism. In a circuit breaker provided with a counter that is mechanically linked to the operation of the counter and counts at least one of the electrical opening and closing, one end is connected to the connecting mechanism and the other end is connected to the counter. It is characterized in that a torsion spring is provided, and a support tool that penetrates the coil portion of the torsion spring and supports the torsion spring is provided.

  The movement of the counter lever of the circuit breaker configured as described above causes an erroneous count because the impact generated by the opening operation is absorbed by the accumulator of the torsion spring and the support that penetrates the coil portion of the torsion spring. You can get no counter.

It is a side view at the time of opening of the vacuum circuit breaker of Embodiment 1 of this invention. It is a side view at the time of closing of the vacuum circuit breaker of Embodiment 1 of this invention. It is a disassembled perspective view of the torsion spring attaching part of Embodiment 1 of the present invention. It is a side view at the time of opening of the vacuum circuit breaker of Embodiment 2 of this invention. It is a disassembled perspective view of the torsion spring attachment part of Embodiment 2 of this invention.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a vacuum circuit breaker according to Embodiment 1 of the present invention at the time of opening, FIG. 2 is a side view at the time of closing, and FIG. 3 is an exploded perspective view around a torsion spring mounting portion. In addition, the same code | symbol in a figure has shown the same or equivalent part.

  As shown in FIG. 1, the vacuum circuit breaker 100 according to the first embodiment includes an operation frame that houses an insulating frame portion 10 that houses the vacuum valve 1 and an operation / control mechanism such as a closing spring (not shown) of the vacuum valve 1. And a carriage frame portion 30 which mounts the insulating frame portion 10 and the operation mechanism frame portion 20 and houses a lever for connecting the vacuum valve and the operation mechanism. The fixed conductor 1a located at one end of the vacuum valve 1 in the insulating frame portion 10 is arranged in a direction perpendicular to the axis of the vacuum valve 1, passes through the insulating frame 3 for housing these, and is not shown in the drawing. It is connected to the fixed terminal 2 connected to the bus. A side surface of the movable conductor 1b that moves in one axis so as to be able to advance and retreat from the other end of the vacuum valve 1 is connected to one end of a flexible conductor 4 that is arranged in a direction perpendicular to the axis. Connected to the other end of the flexible conductor 4 is a movable terminal 5 that penetrates the insulating frame 3 and is connected to a load-side bus (not shown). The vacuum valve 1, the fixed side terminal 2 and the movable side terminal 5 are fixed and supported by the support portions 3 a and 3 b of the insulating frame 3, respectively. Further, the end of the movable conductor 1b is connected to one end of the insulating rod 6 which is a part of the coupling mechanism so that the respective axes are the same, and both move in one axial direction as the vacuum valve 1 is opened and closed. ing.

  The other end of the insulating rod 6 penetrates the insulating frame 3 and the carriage frame 7 and is one end of a lever 9 which is a part of a coupling mechanism having a shaft 8 fixed to the carriage frame 7 as a rotation axis. Is pivotably connected to the. The other end of the lever 9 is rotatably connected to an operation shaft 11 that is a part of a coupling mechanism controlled by an operation mechanism that opens and closes the vacuum valve 1, and the movable conductor 1 b is connected via an insulating rod 6. The operation is controlled. The carriage frame 7 is provided with a stopper portion 7a for controlling the rotation range of the lever 9.

  1 is a side view when the vacuum circuit breaker is opened, and FIG. 2 is a side view when the vacuum circuit breaker is closed. 1 and 2, the rotation angle of the lever 9 and the position of the part that transmits the driving force such as the insulating rod 6 and the operation shaft 11 connected to the rotation angle are changed. Further, the positions of a torsion spring and a counter lever, which will be described later, also move in conjunction with the rotation angle of the lever 9. When the stopper portion 7a is driven from the closed state of FIG. 2 to the open state of FIG. 1 at high speed, the stopper portion 7a maintains the open state while suppressing the rotation range of the lever 9.

  A plate 12 in which a counter and a mechanism for operating the counter are assembled is attached to the front surface of the carriage frame portion 30 and the front surface of the operation frame portion 20. The counter 13 attached to the plate 12 is configured to advance the display unit of the counter by one unit by rotating a counter lever 13a provided therein by a predetermined angle. The rotation of the counter lever 13a is controlled by the rotation of the torsion spring 14 provided on the plate 12 and its stored energy. One end of the torsion spring 14 is pivotally connected to the other end of the lever 9, and the other end pivots with one end of a length adjustment wire 16 that is a length adjuster used for adjusting the stored force of the torsion spring. The other end of the adjustment wire 16 is rotatably connected to the counter lever 13a. As a result, the torsion spring 14 rotates in conjunction with the drive of the lever 9 and the counting of the counter 13 is advanced.

  The reason why the length adjusting wire 16 is used in the vacuum circuit breaker 100 according to the first embodiment is as follows. In combination with the opening operation of the vacuum circuit breaker 100, the counter lever 13a needs to be rotated by a predetermined angle in order to operate the counter 13 normally. In order to rotate the counter lever 13a by a predetermined angle by the rotation of the torsion spring 14 and its stored energy, the vacuum circuit breaker 100 may be opened and the following state may be set. The counter lever 13a is set to an angular position where the display unit of the counter 13 is advanced by one unit, and the tension of the counter lever 13a at that time and the tension of the torsion spring 14 via the adjustment wire 16 are adjusted to be suspended. . For this adjustment, the length of the length adjusting wire 16 may be changed. For example, a wire may be used as the length adjusting wire 16, and a twisted portion may be provided in the middle of the wire using radio pliers or the like, and the length may be adjusted according to the twisted state. However, the length adjusting wire 16 is not always necessary when the relationship between the arm length of the torsion spring and the tension of the counter lever is appropriate. In this case, the other end of the torsion spring 14 is directly connected to the counter lever. What is necessary is just to connect to -13a.

  FIG. 3 is an exploded perspective view showing a column 15 as a support for supporting the torsion spring 14 and a state in which the torsion spring 14 is attached to the column 15 through a hole 12b formed in the column mounting part 12a of the plate 12. FIG. The foot portion of the hexagonal bolt 15a constituting the support column 15 supports the torsion spring 14 so as to be rotatable by passing through the center axis of the coil portion of the torsion spring 14, and the holes of the plate 12 After passing through 12b, it is fastened with a hexagon nut 15b and fixed to the plate 12. Note that the washer 15c is appropriately used as necessary. At this time, the column 15 supported by the plate 12 does not shift the center position of the torsion spring 14 and can rotate around the column 15 as a rotation center. Further, one end of the torsion spring 14 is merely placed on the lever 9, and after the lever 9 collides with the stopper portion 7a, one end of the torsion spring 14 does not collide with the stopper portion 7a, and the column 15 As a center of rotation, it continues to rotate in the opening direction. As a result, at the moment when the lever 9 and the stopper portion 7a collide, that is, at the moment when a large impact or vibration occurs, one end of the torsion spring 14 is lifted from the lever 9, and the impact and vibration transmitted through the torsion spring 14 are received. Can be reduced. Such shock / vibration buffering action cannot be obtained with a conventional circuit breaker using a tension compression spring that is always in contact with the lever 9 with a certain initial load. The specific operation of the counter according to the first embodiment of the present invention will be described below.

  When moving from the closed state in FIG. 2 to the open state in FIG. 1 at high speed, the lever 9 rotates at high speed in the clockwise direction until it comes into contact with the stopper portion 7a of the carriage frame 7 to generate a large impact. . The torsion spring 14 connected to the lever 9 rotates counterclockwise about the support column 15 as a rotation axis, but most of the impact occurs at the moment the lever 9 collides with the stopper portion 7a. Since one end is lifted from the lever 9, it is difficult to transmit. As a result, the counter lever 13a rotates in the clockwise direction through the adjustment wire 16 connected to the other end of the torsion spring 14 without being affected by the impact in conjunction with the movement of the torsion spring 14, thereby opening the vacuum valve 1. Along with the operation, the display of the counter 13 is advanced by one unit and the state shown in FIG. 1 is obtained. Conversely, when closing from the open state, the torsion spring 14 returns to the state shown in FIG. 2 with the support 15 as the center of rotation by the restoring force of the operation counter lever 13a. In the first embodiment of the present invention, since the torsion spring 14 supported by the counter 13 and the support column 15 is supported by the plate 12 and unitized, the counter 13 can be easily installed as an option in the completed circuit breaker body. There is a special effect that can be expanded.

  The movement of the counter lever of the circuit breaker 100 configured as described above is obtained by rotating the torsion spring with the impact generated by the opening operation as the center of rotation of the torsion spring and the support of the torsion spring 14 as a rotation center. Because the structure in which one end of the torsion spring 14 is lifted from the lever 9 at the moment when the lever 9 collides with the stopper portion 7a, shock and vibration are less likely to be transmitted. As a result, the counter is erroneously counted. In this way, a special effect that the display unit of the counter can be advanced in accordance with the opening operation can be obtained. In the above embodiment, the opening operation has been described. However, when the closing operation for shifting from the opening state to the closing state is fast, for example, even when the operation mechanism is an electromagnetic operation mechanism. , The same action and the accompanying effect can be obtained

Embodiment 2. FIG.
Hereinafter, a second embodiment of the present invention will be described in detail with reference to the drawings. 4 is a side view of the vacuum circuit breaker according to the second embodiment of the present invention when it is opened, and FIG. 5 is an exploded perspective view of the vicinity of the torsion spring mounting portion. 5 and 6, the same reference numerals are given to the same or corresponding parts as those in FIGS. 1 to 4.

  As shown in FIG. 5, the vacuum circuit breaker 200 according to the second embodiment is provided with a stopper 17 on the plate 12 of the vacuum circuit breaker 100 according to the first embodiment in FIG. It is the same as the vacuum circuit breaker 100 of the form 1. The shape of the stopper 17 of the vacuum circuit breaker 200 is substantially cubic, and a protrusion 17a is provided on one surface, and the movement of the arm part 14a of the other end side of the torsion spring that rotates when the protrusion 17a is opened is stopped. Acts as follows. The stopper 17 includes a main body in which a threaded hole 17b is formed, and a hexagon bolt 17c that is screwed into the hole 17b. The stopper 17 has a hexagon bolt 17c penetrating through a hole 12d formed in the stopper mounting portion 12c provided perpendicularly to the column mounting portion 12a of the plate 12, and a position adjusting washer 15c and an adjusting nut as appropriate. 18 is fixed to the plate 12 by screwing with the hole 17b. Since the side surface of the stopper 17 is in contact with the side surface of the plate 12, the stopper 17 does not fall off without being tightened with the nut 18.

  Adjustment of the torsion spring 14 using the stopper 17 will be described below. The vacuum circuit breaker 200 is opened. The nut 18 is in a state before the hexagon bolt 17c is tightened. When the hexagon bolt 17c is rotated at this time, the side surface of the main body of the stopper 17 contacts the plate 12 and cannot rotate, so that only the main body of the stopper 17 moves back and forth. The hexagon bolt 17c is rotated and adjusted so that the arm portion 14a of the torsion spring is in contact with the protrusion 17a of the stopper. Adjustment is completed by connecting the wire 16 to the counter lever 13a and the arm portion 14a. As a result, the minimum necessary rotation angle of the arm portion 14a can be ensured, and an excessive stored force of the torsion spring 14 at the time of opening is absorbed by the stopper 17. The shape of the stopper of the present invention is not limited to the shape of the embodiment, and any shape can be used as long as it adjusts and limits the range of the rotation angle in which the arm portion 14a of the torsion spring moves. There may be.

  The movement of the counter lever of the circuit breaker configured as described above is based on the impact generated by the opening operation by accumulating the torsion spring and rotating from the lever 9 with the torsion spring support as the center of rotation. Since the floating and the accumulated energy of the extra torsion spring are absorbed by the stopper, the counter display unit can be advanced in accordance with the opening operation without causing erroneous counting of the counter. An effect is obtained.

1a Fixed conductor 1b Movable conductor
6 Insulating rod 9 Lever
11 Operation shaft
13 Counter 13a Counter lever
14 Torsion spring 14a Arm part
15 Strut (supporting tool) 16 Adjustment wire (length adjusting tool)
17 Stopper

Claims (5)

Fixed and movable conductors arranged opposite to each other, a coupling mechanism that moves the movable conductor to open and close by electrical contact with the fixed conductor, and mechanically interlocks with the operation of this coupling mechanism In a circuit breaker comprising a counter for counting at least one of the electrical opening and closing,
A torsion spring having one end connected to the coupling mechanism and the other end coupled to the counter;
A circuit breaker comprising a support that penetrates the coil portion of the torsion spring and supports the torsion spring. Fixed and movable conductors arranged opposite to each other, a coupling mechanism that moves the movable conductor to open and close by electrical contact with the fixed conductor, and mechanically interlocks with the operation of this coupling mechanism In a circuit breaker comprising a counter for counting at least one of the electrical opening and closing,
A torsion spring connected to a length adjuster having one end connected to the connecting mechanism and the other end connected to the counter;
A circuit breaker comprising a support that penetrates the coil portion of the torsion spring and supports the torsion spring. The circuit breaker according to claim 1 or claim 2,
The coupling mechanism includes a lever whose rotation range is suppressed by contact and separation with the stopper portion,
A torsion spring having one end detachably engaged with the lever and the other end coupled to the counter;
The circuit breaker characterized in that one end of the torsion spring is separated from the lever when the stopper portion and the lever come into contact with each other. The circuit breaker according to any one of claims 1 to 3,
2. A circuit breaker comprising a counter lever for advancing counting, and the counter lever is connected to one end of a connecting mechanism via a torsion spring. The circuit breaker according to any one of claims 1 to 4,
A circuit breaker comprising a stopper that contacts an arm portion of a torsion spring when a movable conductor is separated from a fixed conductor to be in an open state.

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