JPH0316193Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a circuit breaker, and particularly to a circuit breaker equipped with a neutral pole that can be applied to a three-phase, four-wire system.

[Prior art]

In general, in a four-pole circuit breaker, where the neutral pole is used to open and close the neutral phase, and the other three poles are used to open and close the voltage phase, the neutral pole opens faster and opens later than the other poles. opening and closing is required. A conventional example of such a circuit breaker is based on a standard three-pole circuit breaker as shown in FIGS. 8 and 9 of the drawings, with a neutral pole integrally added thereto. 8th, 9th
The extraction type standard three-pole circuit breaker shown in the figure consists of a circuit breaker body 1, an extraction fixing frame 2, a front cover 3 of the circuit breaker body 1, and an insulating material attached to the fixing frame 2. A terminal block 4 is provided, and fixed side main circuit connectors 6 corresponding to movable side main circuit connectors 5 on the power supply side and load side, which serve as secondary disconnection sections, are attached to the terminal block 4.

In addition, FIGS. 10 to 14 show a four-pole circuit breaker that is integrated with an additional neutral pole based on the above-mentioned standard circuit breaker.
FIG. 11 is a simplified front view and a simplified plan view of the case where the neutral pole is added to the right side, and FIGS. 12 to 14 show the operating mechanism for quick-on and slow-off of the neutral pole. The 4-pole circuit breaker shown in Figures 10 and 11 has a circuit breaker body 1', a fixed extraction frame 2', a front cover 3', a movable main circuit connector 5' of a terminal block 4', and a fixed main circuit. It is composed of a connector 6'.

As shown in FIGS. 12 to 14, the three voltage movable contacts 11 and the neutral movable contact 11' come into contact with the corresponding fixed contacts 12, 12'. assembled on the same board. Voltage pole movable contact 11 and neutral pole movable contact 1
1' is an interlocking crossbar 1 provided across each pole.
3, and when a charging force is applied to the charging roller 14 from the open state shown in FIG. contact 1
1 rotates clockwise. At the same time, the neutral pole movable contact 11' also rotates clockwise via the connector lever 18, interlocking crossbar 13, neutral pole connector lever 19, and neutral pole operating rod 20. Since the separation distance of the neutral pole is smaller than that of the other voltage poles, the state shown in FIG. 13 is reached in which the movable contact 11' of the neutral pole first contacts the fixed contact 12'. Further, a charging force is applied to the charging roller 14, and the neutral terminal connector lever 19 and the neutral terminal operating rod 20 become almost in a straight line, the toggle links 15 and 16 are extended, and the movable contact 11 of the voltage pole becomes a fixed contact. The first person who touched 12
The circuit becomes closed as shown in Figure 4. In addition, in the case of an open circuit, the configuration is such that the operation is opposite to that described above, and the movable contact 11 of the voltage pole is opened first by the fixed contact 12, and the movable contact 11' of the neutral pole is opened later. has been done.

[Problem that the invention attempts to solve]

As mentioned above, in a conventional circuit breaker that is assembled integrally with additional neutral poles on the same board, from a structural standpoint, the voltage pole and the neutral pole have the same opening/closing mechanism, and the neutral pole is quickly inserted. In order to have a delayed disconnection, the neutral pole and the voltage pole are connected to the connector levers 18, 19 and the operating rod 17,
20 has to be changed, making it impossible to maintain a sufficient opening distance for the neutral electrode. In addition, with respect to the opening and closing timing of the voltage pole, the timing at which the neutral terminal opens and closes, which is fast-on and late-off, is the connector lever 18, 19.
This is uniquely determined by the length of the operating rods 17 and 20, and there is a drawback that the time difference between opening and closing of the voltage pole and the neutral pole cannot be arbitrarily set.

SUMMARY OF THE INVENTION Accordingly, the main object of this invention is to provide a neutral pole interrupting device that can be coupled to a standard three-pole circuit breaker that overcomes the drawbacks of the prior art as described above.

[Means for solving problems]

The circuit breaker according to this invention is a standard three-pole circuit breaker, and a neutral pole interrupting device added to interlock with the fixed contact and a movable contact provided to make contact with and separate from the fixed contact. A charging roller is attached to a roller support member that is integrally provided with the child device via an insulator, a cutoff spring is installed between the roller support member and the fixed frame, and a cutoff spring is installed on the operating shaft in opposition to the charging roller. It is composed of an input cam that rotates to operate the movable contact device to the open/close position, and an engagement groove provided in the input cam so as to engage the input roller in the open position.

[Effect]

The neutral pole interrupting device that is added in conjunction with the standard three-pole circuit breaker of this invention can arbitrarily set the opening distance of the neutral pole and the time difference between fast-on and slow-release opening and closing with the voltage pole. .

[Example of idea]

Figures 1 to 7 of the drawings show one embodiment of this invention, and as shown in the drawings, the extracted standard form 3
The polar circuit breaker includes a circuit breaker body 21, an extraction fixing frame 22, a front cover 23 of the circuit breaker body 21, and a terminal block 24 formed of an insulating material on the extraction fixing frame 22. It is provided.
The terminal block 24 is equipped with a fixed main circuit connector 26 corresponding to the movable main circuit connectors 25 on the power supply side and the load side, which serve as secondary disconnection sections. An interlocking cross bar 27 is provided extending over each pole so as to interlock the movable contacts of each pole of the circuit breaker main body 21 to the opening/closing positions, and is provided so as to protrude from the side of the circuit breaker main body 21. A neutral pole cutoff device 30 with a separately manufactured closing jacket is mounted on the right side of the extraction fixing frame 22, and a neutral pole main circuit connector 26' on the power supply side and load side is mounted on the back side. are provided so that they each protrude.

The interlocking crossbar 27 provided across each pole of the circuit breaker body 21 and the operation shaft for opening and closing the movable contact device of the neutral pole interrupting device 30 are connected so as to be interlocked with the opening/closing operation of the circuit breaker body 21. They are connected by a member 28.

As shown in FIGS. 4 to 6, in the neutral pole interrupting device 30, a fixed terminal conductor 31 and a movable terminal conductor 32 are attached to a terminal block 33 made of an insulator, and each protrudes toward the back side. Main circuit connection terminal 26'
is formed. A fixed contact 34 is provided at the inner end of the fixed side terminal conductor 31, and a movable contact rod 36 having a movable contact 35 is provided so as to move toward and away from the fixed contact 34. The movable contact rod 36 is connected to the movable contact holder 3 by the movable contact rod shaft 37.
The contact spring 39 is rotatably supported at both ends by a contact spring 39 installed between a movable contact rod 36 and a movable contact holder 38 to apply contact pressure. The movable contact holder 38 is rotatably supported by a movable contact support plate 41 by a movable contact holder shaft 40 . Further, a flexible lead conductor 42 is connected between one end of the movable contact rod 36 and the inner end of the movable terminal conductor 32. A movable contact device is formed by main members such as a movable contact 35, a movable contact rod 36, a movable contact holder 38, and a flexible lead conductor 42.
Movable contact holder 3 of this movable contact device
A roller support member 44 is integrally attached to the roller support member 8 via an insulating member 43, and a charging roller 45 is attached to the roller support member 44. A blocking spring 46 is provided between one end of the roller support member 44 and the fixed frame member.
is installed, and the movable contact device is always biased in the opening direction. A charging cam 47 is provided that is in contact with the charging roller 45 and operates the movable contact device to an open/close position by rotation of an operating shaft 48 . The charging cam 47 is provided with an engagement groove 47a that engages with the charging roller 45 in the open position.

In the above-mentioned neutral pole interrupting device 30, the operating shaft 48 is integrally connected to the interlocking crossbar 27 of the circuit breaker body 21 via the connecting member 28,
When the interlocking crossbar 27 of No. 1 is rotated counterclockwise so that the circuit is closed rather than open, the neutral pole cutoff device in the open position as shown in FIG. The input cam 47 is rotated counterclockwise from the state where it is locked in the groove 47a, pushing up the input roller 45, the input roller 45 escapes from the engagement groove 47a, and the circular arc edge 47b of the input cam 47 is pushed up.
The movable contact device is rotated clockwise about the movable contact holder shaft 40 as a fulcrum by riding up and pressing the input roller 45, and as shown in FIG. transition to state. Neutral pole cutoff device 30
The opening and closing of the circuit breaker body 21 is adjusted by the shape of the engaging groove 47a of the charging cam 47 of the charging roller 45 so that the opening and closing of the circuit breaker body 21 is faster and slower than the opening and closing of the circuit breaker main body 21.

FIG. 7 shows another modified embodiment, which does not require an extracting function and is installed on the side of the circuit breaker body 21 instead of the extraction fixing frame 22 in the case of a fixed standard three-pole circuit breaker. Even if the neutral pole cutoff device 30 is installed in the same way, this does not deviate from the gist of the present invention.

In the conventional four-pole circuit breaker mentioned above, in which the voltage pole and the neutral pole are assembled together, due to the structure of the opening/closing operation mechanism, the opening distance of the neutral pole and the quick opening/slow closing of the neutral pole with respect to the voltage pole are limited. However, according to this idea, a separately produced neutral pole interrupting device 30 is added to be linked to the standard three-pole circuit breaker. The design of the neutral pole interrupting device 30 can be freely selected so as to have a sufficient opening distance, and the interrupting performance is further improved than that of conventional devices.

In addition, the neutral pole interrupting device 30 is connected to the operating shaft 48 so as to interlock with the interlocking crossbar 27 of the standard three-pole circuit breaker. The input cam 47 is operated by the input cam 47 which rotates together, and the input cam 47 is provided with an engagement groove 47a that engages the input roller 45 in the open position. As the input roller 45 rotates, the input roller 45 rapidly pushes the input roller 45 up to the arcuate edge 47b with the rising edge of the engagement groove 47a to close the movable contact device. Since the arcuate edge 47b slides on the input roller 45, by changing the shape of the engagement groove 47a, the neutrality of the neutral pole interrupting device is adjusted to the timing of opening and closing of the voltage poles of a standard three-pole circuit breaker. It is possible to freely adjust the opening/closing timing of fast-on/late-off with respect to the voltage pole of the pole, and it is possible to reliably provide the function of fast-on/late-off to the neutral pole.

[Effect of idea]

As described above, according to this invention, the neutral pole interrupting device added to be interlocked with the standard three-pole circuit breaker is brought into movable contact via the operation shaft with the closing cam provided with the engagement groove and the closing roller. Because it is designed to open and close slave devices, it has the advantage of being able to arbitrarily set the opening distance of the neutral pole and the time difference between fast-on and late-break for the opening and closing of the voltage pole of a standard three-pole circuit breaker. It is something to play.

[Brief explanation of the drawing]

Figures 1 to 7 show one embodiment of this invention, in which Figure 1 is a simplified front view of an extraction type circuit breaker implementing this invention, Figure 2 is a simplified side view, and Figure 3 is a simplified side view.
The figure is a simplified plan view, Figure 4 is a partially cutaway plan view of the neutral pole cut-off device attached to the fixed frame, Figure 5 is a side sectional view of the neutral pole cut-off device in the closed state, and Figure 6 is the neutral pole cut-off device. FIG. 7 is a simplified front view showing another embodiment; FIG. 8 and FIG.
The figure shows a simplified front view and a simplified plan view of a conventional extraction type standard 3-pole circuit breaker, and Figures 10 to 14 are neutral according to the conventional standard type circuit breaker shown in Figures 8 and 9. Figures 10 and 11 are a simplified front view and a simplified plan view of a conventional four-pole circuit breaker with additional poles added and integrated, with the neutral pole added to the right side,
Figures 12 to 14 show the operating mechanism for quick-on and slow-off of the neutral pole. Figure 12 is a simplified explanatory diagram showing the open circuit state, and Figure 13 is a simplified diagram showing the moment the neutral pole closes. The explanatory diagram, FIG. 14, is a simplified explanatory diagram showing a closed circuit state. In the figure, 1, 1', 21... circuit breaker body, 2, 2', 22... fixed frame, 3,
3', 23...Front cover, 4, 4', 24...
...Terminal block, 5, 5', 25... Movable side main circuit connector, 6, 6', 26... Fixed side main circuit connector, 1
1, 11'... Movable contact, 12, 12'... Fixed contact, 13, 27... Interlocking crossbar, 14...
...Feeding roller, 15, 16...Toggle link, 1
7, 20... Operating rod, 18, 19... Connector lever, 28... Connection member, 30... Neutral pole cutoff device, 31... Fixed side terminal conductor, 32... Movable side terminal conductor, 33... Terminal block, 34... fixed contact, 35... movable contact, 36... movable contact rod, 38... movable contact holder, 39... contact spring, 41... movable contact support plate, 43... insulating member, 44 …
...Roller support member, 45...Input roller, 46...
...Shutoff spring, 47... Closing cam, 48...
Operation axis.

Claims (1)

[Scope of utility model registration request] A standard type 3-pole circuit breaker and an additional device that is connected to the standard 3-pole circuit breaker so that it opens and closes more quickly and opens later than the standard 3-pole circuit breaker. In a polarity isolation device, a movable contact device includes a fixed contact, a movable contact provided to move into and away from the fixed contact, and a roller support member integrally provided with the movable contact device via an insulator. a closing spring installed between the roller support member and the fixed frame, and a loading roller that is in contact with the loading roller and operates the movable contact device to an open/close position by rotation of an operating shaft. 1. A neutral pole interrupting device comprising: a cam; and an engagement groove provided in the input cam so as to engage with the input roller in an open position.