CN100346436C - Circuit breaker - Google Patents

Abstract

The circuit breaker of the invention comprises: a movable conductor (1) for connecting, disconnecting and grounding a circuit; an insulating holder (7) for fixing the input terminal (3), the connecting terminal (5), and the ground terminal (6); an insulating rod (13) for driving the movable conductor (1); an operating mechanism (10) for controlling the position of the movable conductor (1) by an insulating rod (13), and is configured to: a movable conductor (1) is linearly moved by an operating mechanism (10), an input terminal part (3) is brought into contact with a connecting terminal part (5) through the movable conductor (1) to set a circuit in a connected state, the input terminal part (3) is brought into contact with a ground terminal part (6) through the movable conductor (1) to set the circuit in a grounded state, and the movable conductor (1) is brought into contact with only the input terminal part (3) to set the circuit in an open state.

Description

breaker

technical field

The present invention relates to the structure of a circuit breaker (also called a three-point circuit breaker) for connecting, disconnecting, and grounding circuits.

Background technique

For example, in Japanese Patent Laid-Open No. 3-272529, there is a movable plate rotatably pivotally mounted on a hinge; the operation of connecting the fixed contact terminal in contact with the movable plate with the ground terminal and the movable plate Shaft; and a 3-position circuit breaker for bearings supporting the operating shaft, a circuit breaker with fixed contact terminals fixed on the same insulating support, hinge with movable plate rotatably pivoted, bearing, grounding terminal is disclosed device (circuit breaker).

In this conventional circuit breaker, the movable plate, the ground terminal, and the fixed contact terminal, which are members constituting the main circuit, are integrally attached to the insulating support.

Furthermore, the operating mechanism is attached to the outer side of the housing of the switch gear, and the main circuit configuration part and the operating mechanism are connected by a link (operating lever).

In the breaking device described in Japanese Patent Laid-Open No. 3-272529, the main circuit configuration part and the operating mechanism are not integrated. After the main circuit configuration part and the operating mechanism are respectively installed on the frame part of the switch gear, It is necessary to adjust the connection position, disconnection position, and grounding position of the movable plate. Since the main circuit components are concealed in the switch gear housing, there is a problem that the adjustment time is increased.

There is also a problem that it is necessary to ensure the manufacturing dimensional accuracy of the switch gear housing.

In addition, Japanese Patent Application Laid-Open No. 2002-218611 discloses a gas insulated switchgear comprising: a fixed contact point connected to a terminal on the movable contact side of the breaker, and a terminal arranged on the breaker. The first movable contact and the first operating mechanism that operates the first movable contact, and the operating shaft of the first operating mechanism are mounted on the conductor that is supported on the frame fixed to the container of the breaker unit through an insulating support A line-side circuit breaker that leads out of the breaker unit container and is connected to the output shaft of the operator; it has a fixed contact mounted on the conductor, a second movable contact mounted on the frame, and a second movable contact that operates the second movable contact. The operating mechanism, the operating shaft of the second operating mechanism leads out of the container of the breaker unit and is connected to the line-side grounding switch of the output shaft of the operator.

That is, it discloses a gas-insulated switchgear configured to connect, disconnect, and ground using two different movable electrodes (movable contacts).

In this way, in the circuit breaker shown in the gas insulated switchgear of Japanese Patent Application Laid-Open No. 2002-218611, two movable electrodes (movable contacts) are required to configure the connection position, disconnection position, and grounding position. The connection with the operating mechanism becomes complicated, and there is a problem that miniaturization cannot be achieved because the number of parts of the main circuit configuration portion increases.

Contents of the invention

The present invention is made to solve the above problems, and its first object is to provide a three-point circuit breaker (that is, a circuit breaker that connects, grounds, and disconnects circuits) that can shorten the time required for assembly and adjustment operations and has excellent productivity. ).

Also, a second object is to provide a three-point circuit breaker capable of simplifying the structure of the device, reducing the size of main circuit components, and reducing the number of parts.

Also, a third object is to provide a three-point circuit breaker capable of improving withstand voltage performance.

In the present invention, a circuit breaker is provided, which has: a movable conductor for connecting, disconnecting and grounding a circuit; Bracket; an insulating rod that drives the movable conductor electrically insulated; an operating mechanism that controls the position of the movable conductor through the insulating rod, and the movable conductor is linearly moved by the operating mechanism, and the input terminal The circuit is brought into a connected state by making the input terminal part pass through the movable conductor and contacts the connecting terminal part, and the circuit is brought into a grounded state by making the input terminal part pass through the movable conductor and contacting the ground terminal part, and by making the movable conductor The circuit is in an open circuit state only by contacting the input terminal part, the input terminal part is arranged at the central part of the insulating support, and the connection terminal part and the grounding terminal part are respectively arranged at the two ends of the insulating support at the input terminal part. both sides of the terminal part.

Therefore, according to the present invention, by making use of a simplified structure in which only the movable conductor is moved linearly, any one of the connected state, disconnected state, or grounded state of the circuit can be obtained, so it is possible to provide a A circuit breaker (three-point circuit breaker) that shortens the time required for work.

In addition, it is possible to provide a circuit breaker that realizes compactness of the main circuit constituent parts (that is, movable conductors, input terminal parts, connection terminal parts, ground terminal parts, insulating brackets, etc.) and a reduction in the number of parts and miniaturization (three point circuit breaker).

In addition, according to the present invention, since the operating mechanism and the insulating support are fixed on one intermediate plate to be integrated, and since it is easy to confirm the position control status of the movable conductor executed by the operating mechanism, the adjustment work can be performed easily. more simplistic.

Description of drawings

Fig. 1 is a cross-sectional view showing the structure of a circuit breaker according to Embodiment 1 of the present invention.

Fig. 2 is a sectional view taken along line II-II of Fig. 1 .

Fig. 3 is a diagram for explaining the connected state, disconnected state, and grounded state of the circuit breaker according to the first embodiment.

Fig. 4 is a cross-sectional view showing the structure of an insulating bracket used in the circuit breaker according to the second embodiment.

Fig. 5 is a diagram for explaining the structure of an insulating bracket used in the circuit breaker according to the third embodiment.

Fig. 6 is a cross-sectional view showing the structure of a circuit breaker according to Embodiment 4.

Fig. 7 is a sectional view taken along line VII-VII of Fig. 6 .

Fig. 8 is a diagram showing another structural example of the insulating bracket used in the circuit breaker of the fourth embodiment.

Fig. 9 is a sectional view taken along line IX-IX of Fig. 8 .

Fig. 10 is a sectional view showing the structure of a circuit breaker according to Embodiment 5 of the present invention.

Fig. 11 is a sectional view showing the structure of a circuit breaker according to Embodiment 6 of the present invention.

Fig. 12 is a diagram for explaining the connected state, disconnected state, and grounded state of the circuit breaker according to the sixth embodiment.

Detailed ways

[Embodiment 1]

Fig. 1 is a cross-sectional view showing the structure of a circuit breaker according to Embodiment 1 of the present invention.

Fig. 2 is a sectional view taken along line II-II of Fig. 1 .

As shown in Fig. 1, the main circuit configuration part of the circuit breaker of this embodiment has the following structure: the movable conductor 1 for connecting, disconnecting and grounding the circuit, the input terminal 3, and the electric contact 31 are used to reliably maintain the circuit. The input terminal part is composed of the cylindrical conductor 2 that is in electrical contact with the movable conductor 1 and maintains the linear movement of the movable conductor 1, and the conductor 4 that electrically connects the cylindrical conductor 2 with the input terminal 3 and fixes it; The contact piece 32 constitutes, and through the movable conductor 1 contacts with the above-mentioned input terminal part, obtains the connecting terminal part for the connection state of the circuit; The grounding terminal part for obtaining the grounding state of the circuit by contacting the part.

Furthermore, the input terminal 3 , the connection terminal 5 and the ground terminal 6 are fixed to a cylindrical (for example, cylindrical) insulating holder 7 with bolts 9 .

That is, the input terminal part, the connection terminal part and the ground terminal part are fixedly arranged on the cylindrical insulating support 7 with a predetermined distance, the movable conductor 1 is moved linearly, and the above-mentioned input terminal is moved through the movable conductor 1. The part is in contact with the connecting terminal part to make the circuit in a connected state, the input terminal part is brought into contact with the ground terminal part by the movable conductor part to make the circuit in a grounded state, and the circuit is made in contact with the input terminal part only by the movable conductor part. Create a disconnected state.

The movable conductor 1 is fixed to the main circuit side end of the insulating rod 13 .

The rotation of the intermediate shaft 11 of the operating mechanism 10 linearly drives the insulating rod 13, and the movable conductor 1 fixed to the end of the insulating rod 13 also moves linearly.

Also, as can be seen from FIGS. 1 and 2, in the circuit breaker of this embodiment, the three-phase cylindrical insulating bracket 7 is mounted on one intermediate plate 8, and the operation of linearly moving the three-phase movable conductor 1 is carried out. The mechanism 10 is also mounted on the intermediate plate 8 .

That is, the operating mechanism 10 and the three-phase insulating bracket 7 are fixed to one intermediate plate to be integrated.

Furthermore, the operating mechanism 10 disposed on the intermediate plate 8 is connected to an operating unit (not shown) by an intermediate shaft 11 .

The movable conductor 1 is electrically insulated by an insulating rod 13 and connected to the operating mechanism 10 .

In addition, electric contacts 31, 32, and 33 are assembled to the cylindrical conductor 2, the connection terminal 5, and the ground terminal 6, respectively.

As the electric contact, there is a belt-shaped structure, a coil spring-shaped structure, or the like.

3 is a diagram for explaining the connected state, disconnected state, and grounded state of the circuit breaker of this embodiment. FIG. 3(a) shows the state when the circuit is connected, and FIG. 3(b) shows the state when the circuit is disconnected. Fig. 3(c) shows the state when the circuit is grounded.

In order to make the circuit into a connected state, the insulating rod 13 to which the movable conductor 1 is fixed at the end is linearly driven in the direction of the connection terminal 5 by the operating mechanism 10 .

And, in the connected state of the circuit, as shown in FIG. 3(a), the movable conductor 1 that moves linearly toward the connection terminal 5 makes the input terminal 3, the cylindrical conductor 2, the conductor 4 and the energized contact The input terminal portion constituted by the member 31 and the like is in contact with the connection terminal portion constituted by the connection terminal 5 and the electric contact 32 to be electrically connected.

In order to bring the circuit into a grounded state, the insulating rod 13 to which the movable conductor 1 is fixed at the end is linearly driven in the direction of the ground terminal 6 by the operating mechanism 10 .

And, in the grounded state, as shown in Fig. 3 (c), by moving the movable conductor 1 linearly toward the direction of the ground terminal 6, the input terminal 3, the cylindrical conductor 2, the conductor 4 and the current-carrying contact piece 31 are connected to each other. The input terminal portion constituted by the ground terminal 6 and the electric contact 33 are in contact with the ground terminal portion constituted by the ground terminal 6 and electrically connected.

Also, in order to make the circuit in the disconnected state, as shown in FIG. 3( b ), the movable conductor 1 is not in contact with the connection terminal portion and the ground terminal portion, but only in contact with the input terminal portion and connected.

That is, in order to obtain the disconnected state of the circuit, the insulating rod 13 is linearly driven by the operating mechanism 10, and the movable conductor 1 only needs to be stopped at a position where it contacts only the input terminal portion.

As described above, the circuit breaker of this embodiment is configured such that the movable conductor 1 is linearly moved by the operating mechanism 10, and the input terminal part and the connection terminal part are brought into contact with the movable conductor 1 to make the circuit into a connected state. The movable conductor 1 brings the input terminal part into contact with the ground terminal part to bring the circuit into a grounded state, and the movable conductor 1 makes the circuit into an open state by making the input terminal part contact only.

Therefore, since only the movable conductor 1 is linearly moved, it is a simple structure that can obtain the connected state, the disconnected state, or the grounded state of the circuit, so the time required for assembly and adjustment can be shortened.

In addition, since the structure is simple, it is possible to reduce the size of the main circuit configuration part and reduce the number of parts.

Also, by fixing the operating mechanism 10 and the insulating bracket 7 to one piece of intermediate portion 8 and integrating them, it is easy to confirm the position control status of the movable conductor 1 performed by the operating mechanism 10, and the adjustment work can be made easier. change.

[Embodiment 2]

Fig. 4 is a cross-sectional view showing the structure of the insulating bracket 7 used in the circuit breaker of the second embodiment.

In the above-mentioned circuit breaker of Embodiment 1, the individual insulating brackets 7 in which the input terminal portion, the connection terminal portion, and the ground terminal portion are fixedly arranged at a predetermined distance from each other are provided on each phase. In the form, as shown in Fig. 4, the three-phase insulating bracket is integrally formed.

Accordingly, it is not necessary to attach the individual insulating brackets 7 provided corresponding to each to the intermediate plate 8, and the assemblability can be further improved.

[Embodiment 3]

Fig. 5 is a diagram for explaining the structure of an insulating bracket used in a circuit breaker according to Embodiment 3, Fig. 5(a) is a cross-sectional view seen from the side direction similar to Fig. 1 , and Fig. 5(b) is a plan view.

The circuit breaker of the present embodiment is characterized in that, for example, the vent hole 20 is provided in the insulating bracket 7 of the circuit breaker of the first embodiment.

As shown in FIG. 5 , vent holes 20 are provided in the upper and lower portions of the insulating holder 7 on the connection terminal side and the ground terminal side.

In addition, the position where the vent hole 20 is provided is not limited to the position shown in FIG. 5 .

In the figure, the arrow indicated by symbol A indicates the direction of air flow, and the convective cooling efficiency of the movable conductor 1 constituting the circuit can be further improved by providing the air vent 20 .

In addition, it also has the effect of preventing the conductive foreign matter that may occur during the connection operation from adhering to the inner surface of the insulating holder 7 and reducing the surface withstand voltage performance of the insulating holder 7 .

[Embodiment 4]

Fig. 6 is a cross-sectional view showing the structure of a circuit breaker according to Embodiment 4.

7 is a sectional view taken along line VII-VII in FIG. 6 .

The insulating support 7 used in the circuit breaker of the aforementioned embodiment 1 or 3 is cylindrical, and the insulating support of the circuit breaker of the present embodiment is shown in Figure 6 or Figure 7, and its characteristic is that at least two opposite flat plates Shaped supporting structure (plate-shaped insulating members 7a, 7b).

By forming the insulating holder into a flat shape, the productivity of the insulating holder can be improved compared with the case of a cylindrical shape.

In addition, FIG. 8 is a diagram showing another structural example of an insulating bracket used in a circuit breaker according to Embodiment 4, and FIG. 9 is a cross-sectional view taken along line IX-IX of FIG. 8 .

In the examples of Fig. 6 and Fig. 7, two flat support structures (that is, planar insulating members 7a, 7b) are configured to be parallel up and down, while in the examples of Fig. 8 and Fig. 9, the two flat support structures The support structures (that is, the plate-shaped insulating members 7a, 7b) are arranged in a vertical direction.

Also in the example of FIG. 8, FIG. 9, the same effect as the example of FIG. 6, FIG. 7 can be acquired.

[Embodiment 5]

Fig. 10 is a sectional view showing the structure of a circuit breaker according to Embodiment 5 of the present invention.

In the above-mentioned circuit breaker of Embodiment 1, the input terminal 3 constituting the input terminal portion, the connection terminal 5 constituting the connection terminal portion, and the ground terminal 6 constituting the ground terminal portion are mounted on a single insulating bracket 7 each formed into a cylindrical shape. However, in the circuit breaker of this embodiment, as shown in FIG. 10 , it is characterized in that the input terminal 3 , the connection terminal 5 and the ground terminal 6 are buried at the same time when the insulating support 7 is formed.

That is, it is characterized in that the input terminal portion, the connection terminal portion, and the ground terminal portion are formed integrally with the insulating bracket 7 .

Since the insulating holder 7 is embedded simultaneously during molding, bolts and the like for attaching the input terminal portion, the connection terminal portion, and the ground terminal portion are unnecessary, and the assemblability can be further improved.

[Embodiment 6]

Fig. 11 is a cross-sectional view showing the structure of a circuit breaker according to the sixth embodiment.

In the circuit breaker according to the first embodiment, the mechanism for linearly moving the movable conductor 1 is configured to linearly move the insulating rod 13 by the rotation of the intermediate shaft 10 connected to the operation part (not shown).

Unlike it, the circuit breaker of this embodiment, as shown in FIG. 11, is characterized in that a hollow portion is provided on the movable conductor 1, and a female screw thread is formed on the inner peripheral surface of the hollow portion, and a thread corresponding to the hollow portion is formed. A male screw 14 that is screwed with a female screw is fixed to the end of the insulating rod 13 on the main circuit side, and the screw 14 is fitted into the hollow portion of the movable conductor 1 .

In the circuit breaker configured in this way, when the insulating rod 13 is rotated, the screw 14 fixed to the insulating rod 13 is also rotated.

Since the male thread formed on the screw 14 is screwed with the female thread formed on the inner peripheral surface of the hollow portion of the movable conductor 1 , the movable conductor 1 can be moved linearly by rotating the screw 14 .

Thereby, the operation space of the intermediate shaft 10 can be omitted, and a more compact structure can be made.

In addition, FIG. 12 is a diagram for explaining the connected state, disconnected state, zero state, and grounded state of the circuit breaker of Embodiment 6. FIG. 12(a) shows the state when the circuit is connected, and FIG. 12(b) shows the The state when the circuit is disconnected, and Fig. 12(c) shows the state when the circuit is grounded.

It can be seen from the figure that by rotating the insulating rod 13, the insulating rod 13 and the screw rod 14 fixed on the end of the insulating rod 13 do not perform linear motion, and the movable conductor 1 moves to the connection terminal side or the grounding terminal side according to the rotation direction of the insulating rod 13. move.

Therefore, similarly to the case of the first embodiment, the connected state, the grounded state, and the disconnected state of the circuit can be obtained.

In this embodiment, since the movement space of the intermediate shaft 10 can be omitted, a more compact structure can be made.

[industrial availability]

The present invention is effective for a three-point circuit breaker (that is, a circuit breaker capable of obtaining a connected state, a grounded state, and an open state of a circuit) that facilitates assembly and adjustment operations and can be miniaturized.

Claims (13)

1. A circuit breaker, comprising: a movable conductor (1) for connecting, disconnecting, and grounding an electric circuit; an input terminal portion (3), a connecting terminal portion (5) and a The insulating bracket (7) of the ground terminal part (6); the insulating rod (13) that drives the above-mentioned movable conductor (1) electrically insulated; the position of the above-mentioned movable conductor (1) is controlled by the above-mentioned insulating rod (13) A controlled operating mechanism (10), characterized in that, The above-mentioned movable conductor (1) is linearly moved by the above-mentioned operating mechanism (10), and the circuit becomes In the connected state, the circuit is grounded by making the above-mentioned input terminal part (3) contact the ground terminal part (6) through the above-mentioned movable conductor (1), and by making the above-mentioned movable conductor (1) only contact with the above-mentioned input terminal Part (3) contacts to make the circuit into an open state, The input terminal part (3) is arranged at the central part of the insulating support (7), and the connecting terminal part (5) and the grounding terminal part (6) are respectively arranged at the two ends of the insulating support (7). Both sides of the input terminal section (3). 2. The circuit breaker according to claim 1, characterized in that the operating mechanism (10) and the insulating bracket (7) are fixed on a middle plate (8) to form an integral body. 3. The circuit breaker according to claim 1 or 2, characterized in that the 3-phase insulating support (7) is integrally formed. 4. The circuit breaker according to claim 1 or 2, characterized in that the insulating bracket (7) is cylindrical and has a vent (20) on the side. 5. The circuit breaker according to claim 1 or 2, characterized in that the insulating bracket (7) is composed of two plate-shaped insulating members (7a, 7b) arranged opposite to each other. 6. The circuit breaker according to claim 1 or 2, characterized in that the input terminal part (3), the connection terminal part (5) and the ground terminal part (6) are formed integrally with the insulating bracket (7). 7. The circuit breaker according to claim 3, characterized in that the input terminal part (3), the connection terminal part (5) and the ground terminal part (6) are integrally formed with the insulating bracket (7). 8. The circuit breaker according to claim 4, characterized in that the input terminal part (3), the connecting terminal part (5) and the grounding terminal part (6) are integrally formed with the insulating bracket (7). 9. The circuit breaker according to claim 1 or 2, characterized in that, the above-mentioned movable conductor (1) is cylindrical, and a female thread is formed on the inner peripheral surface of the hollow part, and the end of the above-mentioned insulating rod (13) A screw (14) formed with a male thread screwed with the above-mentioned female thread is fixed on the part, and the above-mentioned movable conductor (1) is linearly moved by rotating the above-mentioned insulating rod (13). 10. The circuit breaker according to claim 3, characterized in that, the above-mentioned movable conductor (1) is cylindrical, and a female thread is formed on the inner peripheral surface of the hollow part, and the end of the above-mentioned insulating rod (13) is A screw (14) formed with a male screw threaded with the female screw is fixed, and the movable conductor (1) is linearly moved by rotating the insulating rod (13). 11. The circuit breaker according to claim 4, characterized in that the above-mentioned movable conductor (1) is cylindrical, and a female thread is formed on the inner peripheral surface of the hollow part, and the end of the above-mentioned insulating rod (13) is A screw (14) formed with a male screw threaded with the female screw is fixed, and the movable conductor (1) is linearly moved by rotating the insulating rod (13). 12. The circuit breaker according to claim 5, characterized in that the movable conductor (1) is cylindrical, and a female thread is formed on the inner peripheral surface of the hollow part, and the end of the insulating rod (13) is A screw (14) formed with a male screw threaded with the female screw is fixed, and the movable conductor (1) is linearly moved by rotating the insulating rod (13). 13. The circuit breaker according to claim 6, characterized in that, the above-mentioned movable conductor (1) is cylindrical, and a female thread is formed on the inner peripheral surface of the hollow part, and the end of the above-mentioned insulating rod (13) is A screw (14) formed with a male screw threaded with the female screw is fixed, and the movable conductor (1) is linearly moved by rotating the insulating rod (13).

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