JP2013140743A - Circuit breaker with wire type trip device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a circuit breaker including a wire type trip device, trip operation of which can be carried out easily and remotely, without impeding handle operation of a breaker.SOLUTION: The circuit breaker includes switching contacts for opening and closing an electrical circuit, and a wire type trip device built in the circuit breaker having a trip bar 6 for opening the switching contacts and operating the trip bar 6 from an external operating part via a drive wire 9. The wire type trip device 7 includes a body built-in section 8 having a trip lever 14 for operating the trip bar 6, and an internal actuator 13 for transmitting a driving force to the trip lever 14, and a transmission mechanism having a rotating plate 21 which is driven by the drive wire 9 to rotate. The trip bar 6 is actuated by driving the trip lever 14 via the internal actuator 13 with the driving force of the drive wire 9.

Description

  The present invention relates to a circuit breaker such as a circuit breaker for wiring or a leakage breaker, and more particularly to a circuit breaker including a wire type trip device for remotely tripping a switching contact.

  In a circuit breaker such as a circuit breaker for circuit breaker or earth leakage breaker, as a conventional device for remotely disconnecting the switching contact, it is fitted to the fixed base attached to the front of the breaker body case and the handle of the breaker The slider is guided and supported by the fixed base, and an operation wire having one end coupled to the slider and the other end coupled to the remote control unit. The handle is moved from the remote control unit to the on, off, and reset positions by wire operation. A wire-type external operation device for a circuit breaker configured to be driven is known (see, for example, Patent Document 1).

JP 2006-331961 A (page 4, FIG. 1)

A conventional circuit breaker wire-type external operation device as shown in Patent Document 1 is structured to be attached to the front surface outside the circuit breaker, and since the handle portion of the circuit breaker is covered by the operation device, There is a problem that it is impossible to attach another external accessory device on the front side.
Also, since the breaker is pulled off by operating the handle of the breaker, it will receive a large spring load of the breaker body mechanism at the time of tripping, and the tripping operation load will increase, so the configuration of the operating device However, there was a problem that it would grow correspondingly.
Furthermore, since the on / off / reset operations are all performed by the external operation device, if the external operation device is not operated, the normal on / off operation cannot be performed and only the trip operation is performed from the outside. There was a problem that it was not suitable.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a circuit breaker having a wire type tripping device which is small and lightweight and does not hinder the handle operation of the breaker. And

  A circuit breaker provided with a wire type tripping device according to the present invention is incorporated in a circuit breaker having an open / close contact for opening and closing an electric circuit and a trip bar for opening the open / close contact, and a drive wire from an operating portion provided outside. In a circuit breaker equipped with a wire trip device that operates the trip bar via the wire trip device, the wire trip device has a trip lever that operates the trip bar and an internal actuator that transmits the driving force to the trip lever. The main body built-in part housed in the housing of the circuit breaker and a transmission mechanism that transmits the driving force of the driving wire to the internal actuator, and the tripping lever is driven via the internal actuator by the driving force of the driving wire. The trip bar is configured to operate.

According to the circuit breaker provided with the wire type trip device of the present invention, the wire type trip device has a trip lever for operating the trip bar and a main body built-in portion having an internal actuator for transmitting a driving force to the trip lever. And a transmission mechanism for transmitting the drive force of the drive wire to the internal actuator, and the trip lever is operated by driving the trip lever via the internal actuator by the drive force of the drive wire. Since the operation handle on the front side is not obstructed by the tripping device, both remote operation and direct operation are possible. In addition, the degree of freedom in attaching other external accessories is increased.
Furthermore, since the operation load is smaller than the configuration in which the operation handle is directly pulled off, a circuit breaker including a wire type tripping device having a small and light configuration can be obtained.

It is a front view which shows the circuit breaker provided with the wire type tripping device by Embodiment 1 of this invention. It is the side view which showed the partial cross section of FIG. It is a figure which shows the main body built-in part of the wire type trip device of the circuit breaker of FIG. 1, (a) is a side view, (b) is a front view. It is a disassembled perspective view which shows the component accommodated in the inside of the main body incorporating part of FIG. It is a disassembled perspective view which shows the wire mounting base part of the wire type tripping device of the circuit breaker of FIG. It is a front view which shows the operation part connected to the drive wire of the circuit breaker of FIG. It is a figure explaining operation | movement of the trip device of the circuit breaker of FIG. 1, (a) shows the time of OFF, (b) is a figure which shows the time of ON. It is a figure which shows the circuit breaker provided with the wire type tripping device by Embodiment 2 of this invention, (a) is a front view, (b) is a side view. It is a figure explaining the inside of the wire type tripping device of the circuit breaker of FIG. 8, (a) (b) shows the time of OFF, (c) (d) is a side view and a front view showing the time of ON. . It is a disassembled perspective view which shows the component of the trip device of the circuit breaker of FIG. It is a disassembled perspective view of the component accommodated in the inside of the housing | casing of FIG.

Embodiment 1 FIG.
1 is a front view showing a circuit breaker including a wire trip device according to Embodiment 1 of the present invention, and FIG. 2 is a side view of FIG. First, the entire circuit breaker will be described with reference to FIGS. 1 and 2.
The circuit breaker 1 includes an opening / closing mechanism portion having an opening / closing contact (not shown) for opening and closing an electric circuit and an operation handle 5 in a housing formed of a lower cover 2, an upper cover 3, and a base 4 formed by molding. A trip detection unit having a trip bar 6 for detecting an overcurrent and opening the switching contact is built in, and the circuit breaker is opened and closed by operating the operation handle 5. The details of the opening / closing mechanism section and the trip detection section adopt a generally known configuration, and are not the main part of the present invention, so detailed description will be omitted. The circuit breaker 1 according to the present embodiment further includes a wire trip device 7 that can be operated from the outside.

The wire-type tripping device 7 is remotely connected to a tripping lever 14 for operating the trip bar 6, a main body built-in portion 8 having an internal actuator 13 for transmitting a driving force to the tripping lever 14, and an operation unit 28 described later. The driving wire 9 is driven by an operation, and a distal end side mechanism portion of the driving wire 9 is accommodated, and the wire mounting base portion 10 is a transmission mechanism portion that transmits the driving force of the driving wire to the internal actuator.
The main body incorporating portion 8 is incorporated in an internal attached mounting frame (not shown) provided on the lower cover 2. The wire mounting base 10 is incorporated by being inserted into a mounting base insertion groove (not shown) formed on the side surface of the lower cover 2, and the wire tripping device 7 is closed by closing the upper cover 3. Is fixed. Hereinafter, each part which comprises the wire type tripping apparatus 7 is demonstrated in detail.

3A and 3B are detailed views of the main body incorporating portion 8, wherein FIG. 3A is a side view and FIG. 3B is a front view. Here, the side view of (a) has shown the figure seen from the opposite direction (back surface side) of the side view of FIG.1 (b).
As shown in the figure, the main body built-in portion 8 includes a case 11 provided with a snap fit portion 11 a for fixing inside the lower cover 2 and opened on one side, and a cover 12 that closes the opening side of the case 11. The fixed frame portion in which the internal actuator 13 and the tripping lever 14 are incorporated is housed and fixed in the housing.
In addition, the side view of (a) shows the state where the cover 12 is removed and the inside can be seen, and the front view of (b) also shows some parts on the front side omitted and is on the lower side. The parts are visible.

FIG. 4 is an exploded perspective view showing details of the fixed frame portion incorporated in the main body incorporating portion 8. The fixed frame portion is composed of a fixed frame 15 formed in a U-shape and a support plate 16 combined on the open end side. The support plate 16 has an internal actuator 13 slid in the center. It has a holding portion 16a for holding it in a movable manner, and an arm portion 16b in which a shaft hole for passing a shaft pin 17 serving as a rotation shaft of the tripping lever 14 is formed.
The trip lever 14 is rotatably incorporated in the arm portion 16a of the support plate 16 by a shaft pin 17. Further, a coil spring 18 is inserted into the shaft pin 17, and this coil spring 18 is shown in FIG. When viewed in the direction of, it serves to impart a force to the trip lever 14 to rotate clockwise. Further, as indicated by an arrow in FIG. 3, the internal actuator 13 is slidable through the holding portion 16 a of the support plate 16, and one end engages with a groove provided at one end of the tripping lever 14. Therefore, the trip lever 14 rotates about the shaft pin 17 in conjunction with the movement of the internal actuator 13.

  FIG. 5 is an exploded perspective view showing details of the wire mounting base 10, (a) shows a completely disassembled state, and (b) shows an assembling process. As shown in (a), the mounting base 19 in the shape of a rectangular box has a fixing portion 19a for insertion into a groove formed in the lower cover 2 of the circuit breaker housing on the side surface in the longitudinal direction. A fixing hole for inserting and fixing the mounting base actuator 20 and the rotating shaft 22 and the column 23 of the rotating plate 21 is provided on the lower side of the notch window of the fixing portion 19a. A U-shaped groove 19b for holding the drive wire 9 is provided on one side in the longitudinal direction.

  The drive wire 9 includes an outer skin and a wire body slidably provided inside the outer skin. The distal end portion of the drive wire 9 exposes the wire main body by a predetermined length, the spring 24 is inserted into the exposed portion, and the distal end is passed through the hole of the mounting base actuator 20 and fixed with the stopper 25. The mounting base actuator 20 and the rotating plate 21 are inserted through the rotating shaft 22 and fixed, and rotate integrally with the rotating shaft 22.

As shown in FIG. 5 (b), the mounting base actuator 20 integrated with the tip of the drive wire 9, the rotating shaft 22 of the rotating plate 21, and the two support columns 23 are incorporated in the mounting base 19. From above, a column support 26 is attached to support the rotating shaft 22 by fixing the upper portion while preventing disassembly of these components. Further, the mounting base 19 is closed by the cover 27, and the assembly of the wire mounting base 10 is completed. On the back surface of the cover 27, grooves having the same shape are formed at positions facing the U groove 19 b of the mounting base 19, and the outer surface of the drive wire 9 is sandwiched and fixed by these grooves.
Thereby, when the drive wire 9 is driven, the driving force of the drive wire 9 that moves linearly is converted into a rotational motion, and the rotating plate 21 is rotated. 8 to the internal actuator 13.

FIG. 6 shows the operation unit 28 provided on the other end side of the drive wire 9. (A) and (b) show the appearance, and (c) and (d) show the internal connection state. As shown in the figure, for example, a rotary switch 29 is provided, and the other end side of the drive wire 9 is connected to the switch 29. When it is desired to operate the wire tripping device 7, the tension of the drive wire 9 is weakened by setting the switch 29 to the ON position, and when it is not operated, the tension of the drive wire 9 is increased. In addition, a lock function is provided to lock the circuit breaker so that it cannot be turned on by pushing the switch 29 in the ON position.

Next, the operation will be described with reference to FIG.
During normal operation when the tripping device is not operated, that is, when it is not operating, the switch 29 in FIG. 6 is in the OFF position, and as shown in FIG. 7A, the drive wire 9 is connected to the wire tripping device 7 side. It is pulled to the power source side, and the spring 24 is contracted and tension is applied. In this position, the rotating plate 21 fixed to the rotating shaft 22 is held while the internal actuator 13 is pushed in the direction of the load side of the circuit breaker, and the tripping lever 14 trips the circuit breaker. The trip bar 6 is not touched and the apparatus does not operate (see also FIG. 3).

  During operation, the switch 29 of the operation unit 28 shown in FIG. 6 is switched to the ON position. As a result, as shown in FIG. 7B, the drive wire 9 is extended on the wire tripping device 7 side. When the drive wire 9 extends, the mounting base actuator 20 is pushed, rotates about the rotation shaft 22, and the rotation plate 21 moves away from the internal actuator 13. As described with reference to FIG. 3, the tripping lever 14 is applied with a driving force in the direction of pushing down the trip bar 6 due to the spring load of the coil spring 18, so that when the pressing force to the internal actuator 13 disappears, the tripping lever 14 14 rotates in the direction to push the trip bar 6 about the shaft pin 17, and the circuit breaker trips when the trip bar 6 is pushed and falls.

  At this time, when the switch 29 of the operation unit 28 is pushed in and the ON state is locked, the trip bar 6 is kept in the collapsed state in the circuit breaker and can be turned on even if the operation handle 5 of the breaker is operated. The circuit breaker can be locked remotely.

  Furthermore, in the unlikely event that the wire body of the drive wire 9 is cut, the extension force of the spring 24 applied between the U groove 19b portion of the mounting base 19 and the mounting base actuator 20 acts. And the circuit breaker is automatically tripped.

As described above, according to the circuit breaker including the wire tripping device according to the first embodiment, the wire tripping device transmits the driving force to the tripping lever and the tripping lever that operate the trip bar. A main body built-in portion having an internal actuator and housed in a circuit breaker housing, and a transmission mechanism for transmitting the driving force of the driving wire to the internal actuator, and a trip lever via the internal actuator by the driving force of the driving wire Since the trip bar is actuated by driving, the front side of the circuit breaker is not covered by the tripping device, so that both remote and direct operations are possible. In addition, the degree of freedom in attaching other external accessories is increased.
Furthermore, compared to a configuration in which the operation handle is pulled directly off, the operation load can be reduced in order to operate the trip bar inside the circuit breaker, so that the device can be miniaturized, and the wire type tripping device has a small and lightweight configuration. A circuit breaker provided with the device can be obtained.

  In addition, the transmission mechanism is connected to the wire mounting base attached to the side surface of the circuit breaker casing and the tip of the drive wire attached to the wire mounting base and rotates by the expansion and contraction of the driving wire. Since the drive force is transmitted to the internal actuator by the rotation of the rotating plate, the drive wire can be drawn from the upper side or the lower side of the circuit breaker, so that multiple circuit breaks It becomes possible to install the container in close contact in the lateral direction.

Also, when the drive wire is cut, a spring is provided to keep the trip lever driven in the trip bar operating direction, so even if the drive wire is cut, The circuit breaker can be tripped automatically.

  Furthermore, the operation unit has a switch that drives and switches the drive wire between the trip-on state and the opposite off state, and has a lock function that keeps the switch on state. It is possible to lock the operating state of the circuit breaker, and a circuit breaker excellent in safety can be obtained.

Embodiment 2. FIG.
FIG. 8 is a front view (a) and a side view (b) showing a circuit breaker provided with a wire type trip device according to Embodiment 2 of the present invention. 9 is a diagram showing the internal structure of the wire type tripping device of FIG. 8, (a) and (b) are a side view and a front view showing the state when OFF, and (c) and (d) are when ON. It is the side view and front view which show the state. 10 is an exploded perspective view showing a main body built-in portion of the wire type tripping device of FIG. 9, and FIG. 11 is an exploded perspective view showing details of the internal housing component of FIG. In the following description, parts equivalent to those in FIGS. 1 to 4 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 8, the wire trip device 31 of the present embodiment built in the circuit breaker 1 is connected to the main body built-in portion 32 corresponding to the main body built-in portion 8 described in the first embodiment. Since the difference between the first embodiment and the first embodiment is that a transmission mechanism for transmitting the driving force to the internal actuator 13 is incorporated, the difference will be mainly described.
As shown in FIG. 9, the main body built-in portion 32 of the wire tripping device 31 has a fixed frame portion having a tripping lever 14 for operating the internal actuator 13 and the trip bar 6. A billet 35 provided at the tip of the wire 33 is slidably provided, and a transmission mechanism portion in which the billet 35 and the internal actuator 13 are connected by a connecting member 36 is incorporated.
The operation unit provided on the other end side of the drive wire 33 is the same as the operation unit 28 shown in FIG. 6 of the first embodiment.

  Next, the built-in components of the main body incorporating unit 32 will be described with reference to FIGS. The main body built-in portion 32 includes a case 11 and a cover 12 provided with a snap-fit portion 11a for fixing to the lower cover 2, and a U-shaped fixing frame 15 and A support plate 16 combined on the open end side, a trip lever 14 fixed to the arm portion 16b of the support plate 16 by a shaft pin 17, and a fixed direction to the trip lever 14 inserted through the shaft pin 17 And the internal actuator 13 that engages with one end of the tripping lever 14 to transmit the driving force, and is substantially the same as in the first embodiment. In the present embodiment, a guide member 34 having a guide groove 34a for guiding the distal end side of the drive wire 33 is further accommodated.

FIG. 11 is an exploded perspective view of the fixed frame portion of FIG. As shown in the drawing, the guide groove 34 a provided in the guide member 34 is formed in a cylindrical shape in which the distal end side is curved in an arc shape in a direction away from the holding portion 16 a of the support plate 16 and provided at the distal end portion of the drive wire 33. The billet 35 is slidable.
When the whole is combined, FIG. 9 is obtained. A spring 37 is inserted into the exposed portion of the wire body at the tip of the drive wire 33. The connecting member 36 that connects the billet 35 and the internal actuator 13 is made of a flexible wire, for example.

Next, the operation will be described with reference to FIG.
When the tripping device is not operated normally, that is, when the tripping device is not operating, as shown in FIGS. 9A and 9B, the wire tripping device 3 is operated by turning off the switch 29 of the operation unit 28 similar to FIG.
On one side, the drive wire 33 is pulled and the tension of the spring 37 is applied, and the drive wire 33 is in a contracted state. At this position, since the tension is not applied to the connecting member 36, the driving force does not act on the internal actuator 13 for operating the trip lever 14. Therefore, the trip lever 14 is not in contact with the trip bar 6.

  During operation, when the switch 29 of the operation unit 28 is turned ON, the drive wire 33 is extended on the wire tripping device 31 side as shown in FIGS. When the drive wire 33 extends, the billet 35 slides on the guide groove 34 a of the guide member 34, so that tension is generated in the connecting member 36, and the internal actuator 13 is pulled via the connecting member 36. As shown in (c), the trip bar 6 inside the circuit breaker is pushed down and the circuit breaker 1 trips.

At this time, the operation of the circuit breaker can be locked as in the first embodiment by locking this state with the operation unit 28.
Furthermore, in the unlikely event that the wire body of the drive wire 33 is cut, the extension force of the spring 37 works, and the billet 35 operates as shown in FIG. It is tripped with.

  As described above, according to the circuit breaker including the wire tripping device according to the second embodiment, the transmission mechanism that transmits the driving force of the driving wire to the internal actuator is the billet provided at the tip of the driving wire. And a guide groove that is formed inside the main body built-in portion and curved in an arc shape for sliding the billet, and a connecting member that connects the billet and the internal actuator, and the expansion and contraction operation of the drive wire is connected to the billet Since it is transmitted to the internal actuator through the member, in addition to the effect of the first embodiment, the wire mounting base portion of the drive wire is not required on the side surface, so that the size can be reduced and the number of parts to be used is also increased. Therefore, the cost can be reduced.

DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 Lower cover 3 Upper cover 4 Base 5 Operation handle 6 Trip bar 7,31 Wire-type tripping device 8,32 Body built-in part 9,33 Drive wire 10 Wire mounting part 11 Case 11a Snap fit part 12 Cover DESCRIPTION OF SYMBOLS 13 Internal actuator 14 Trip lever 15 Fixed frame 16 Support plate 16a Holding part 16b Arm part 17 Axis pin 18 Coil spring 19 Mounting base 19a Fixed part 19b U-shaped groove 20 Mounting base actuator 21 Rotating plate 22 Rotating shaft 23 Column 24, 37 Spring 25 Clasp 26 Post support 27 Cover 28 Operation part 29 Switch 34 Guide member 34a Guide groove 35 Billet 36 Connecting member.

Claims (5)

Built-in a circuit breaker having an open / close contact that opens and closes an electric circuit and a trip bar that opens the open / close contact, and equipped with a wire type trip device that operates the trip bar via a drive wire from an operating portion provided outside. In circuit breaker,
The wire-type tripping device includes a tripping lever that operates the trip bar and an internal actuator that transmits a driving force to the tripping lever. A transmission mechanism for transmitting the driving force of the driving wire to the internal actuator,
A circuit breaker provided with a wire type trip device, wherein the trip bar is operated by driving the trip lever through the internal actuator by the driving force of the drive wire. A circuit breaker comprising the wire trip device according to claim 1,
The transmission mechanism is connected to a wire mounting base attached to a side surface of the casing of the circuit breaker, and a distal end portion of the driving wire attached to the wire mounting base, and is rotated by an expansion / contraction operation of the driving wire. And a rotating plate that
A circuit breaker provided with a wire type tripping device, wherein a driving force is transmitted to the internal actuator by the rotation of the rotating plate. A circuit breaker comprising the wire trip device according to claim 1,
The transmission mechanism includes a billet provided at a distal end portion of the drive wire, a guide groove that is formed inside the body built-in portion and curved in an arc shape in which the billet slides, the billet, and the internal actuator. A connecting member to be connected,
A circuit breaker provided with a wire-type tripping device, wherein the expansion / contraction operation of the drive wire is transmitted to the internal actuator via the billet and the connecting member. In the circuit breaker provided with the wire type trip device according to any one of claims 1 to 3,
A circuit breaker provided with a wire type trip device, wherein when the drive wire is cut, a spring is provided to hold the trip lever driven in the trip bar operating direction. vessel. In the circuit breaker provided with the wire type trip device according to any one of claims 1 to 4,
The operation unit includes a switch that drives and switches the drive wire between on and off, which is in a tripping state, and has a lock function for holding the on state in the switch. A circuit breaker equipped with a wire type tripping device.

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