JPH0547272A - Circuit breaker - Google Patents

Abstract

(57) [Abstract] [Purpose] Circuit breaker with excellent current limiting performance that can improve the rotating speed of the movable contactor at the initial stage of opening and increase the extension drive force of the arc to the terminal side. Provide a vessel. A movable contact 1 having a rotation center 14 and a movable contact 2 at one end, a fixed contact 3 that can be brought into contact with and separated from the movable contact 2 of the movable contact 1, and a fixed contact 3 at the tip. Further, it has a repulsive conductor 4A which is elastically supported rotatably about a pivotal center 17 of the base end and which is parallel to and below the movable contactor 1 when closed, and a repulsive conductor 4A at one end. And a connecting conductor 4 having the other end connected to the terminal portion 5A and forming a blow-out coil for generating a magnetic field for extending and driving the arc generated between the contacts 2 and 3 to the terminal portion 5A side. 1 is located below the upper current path of the blowout coil and the terminal portion 5A at the time of opening.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, and more particularly to a circuit breaker having improved arc extinguishing device performance.

[0002]

2. Description of the Related Art A conventional circuit breaker of this type is known, for example, from Japanese Patent Application Laid-Open No. 62-163235. Therefore, the circuit breaker described in this publication will be described with reference to (a) to (c) of FIGS. In FIG. 18, 1 is a movable contactor, 2 is a movable contact fixed to one end of the movable contactor 1, 3 is a fixed contact with which the movable contact 2 is brought into contact with and separated from by the rotation of the movable contactor 1, and 4 is a linear conductor. A connecting conductor 5A which is composed of the portion 4A and the U-shaped conductor portion 4B and forms a blowout coil, 5A is a terminal portion electrically connected to the connecting conductor 4 by a screw 6, and 5B is a terminal which makes a pair with the terminal portion 5A. Reference numeral 7 is a fixed contact made up of the fixed contact 3 and the connection conductor 4, 8 is an arc-extinguishing grid, 9 is a mechanism for opening and closing the movable contact 1, 10 is a detector for detecting an abnormal current, and 11 is a shunt. , 12 are containers for accommodating the above-mentioned members.

Next, the operation will be described. In the energized state shown in FIG. 19A, the movable contact 2 and the fixed contact 3 are in a closed state, and the terminal portion 5A, the connection conductor 4, the fixed contact 3, the movable contact 2, the shunt 11, and the terminal portion 5B. Current flows through the path as indicated by arrow I. Then
When the mechanism unit 9 is manually operated or the detection unit 10 detects an abnormal current and sends an operation signal, the mechanism unit 9 operates to open and close the contacts 2, 3. However, when the abnormal current is a short-circuit current, the movable contact 1 is repulsed by the electromagnetic repulsive force and the contacts 2 and 3 are separated prior to the operation of the mechanism section 9. With the opening of each contact 2,3, these contacts 2,3
An arc A is generated between them, and the distance between the contacts 2 and 3 is the arc A.
When the value exceeds the value required to drive the arc, the arc A is driven in the direction of the arc extinguishing grid 8 due to the influence of the magnetic field of the blowout coil forming the connection conductor 4 as shown in FIG. 19B. Extend A. At this time, since the blowout coil is located in the vicinity of each contact 2 and 3 at the time of closing, the magnetic field generated by the blowout coil is intensively applied to the arc A immediately after the arcing, and the arc A is rapidly driven. , The arc A voltage is rapidly increased and the current is limited. Further, when the distance between the contacts 2 and 3 increases, as shown in FIG.
Since the movable contactor 1 is located above the upper current path of the blowout coil as shown in (c) of FIG. 1, the action of driving the arc A by the magnetic field generated by the blowout coil and the action of extending it are substantially eliminated. Due to the action of the arc extinguishing grid 8 and the action of the current path in the arc extinguishing chamber space including the arc A, the arc A is driven and extended toward the arc extinguishing grid 8 and is cooled by the arc extinguishing grid 8 and the current is cut off.

[0004]

However, in the conventional circuit breaker, since the connecting conductor 4 forming the blowout coil is arranged in the vicinity of the movable contact 2 and the fixed contact 3 at the time of closing, It is possible to intensively apply a magnetic field that drives and extends the arc A immediately after the arc, but at the time of closing, most of the movable contact 1 except the movable contact 2 is located outside the blowout coil. Therefore, almost no magnetic field component for driving the movable contactor 1 in the direction of opening the movable contact 1 is obtained, and the opening speed increases slowly in the initial stage of opening, which is the minimum necessary for driving the arc A. However, there is a problem in that it takes a long time to reach the distance between the contacts 2 and 3 and the current limiting performance cannot be sufficiently obtained.

The present invention has been made to solve the above-mentioned problems, and it is possible to improve the rotating speed of the movable contactor at the initial stage of opening and increase the driving force for extending the arc toward the terminal portion. It is an object of the present invention to provide a circuit breaker having excellent current limiting performance.

[0006]

A circuit breaker according to a first aspect of the present invention includes a movable contact having a center of rotation and a movable contact fixed to one end, and the movable contact being rotated to rotate the movable contact. A fixed contact that can be contacted with and separated from the fixed contact, and the fixed contact is fixed to the tip and elastically supported so as to be rotatable around the base end side, and is positioned parallel and below the movable contact when closed. A conductor portion, and a connection conductor having a conductor portion at one end and having the other end connected to a terminal portion and forming a blow-out coil for generating a magnetic field for extending and driving an arc generated between the contacts to the terminal portion side; When the direction in which the movable contact separates from the fixed contact by the rotation of the movable contact from the closed state is upward, the current path above the blowout coil and the terminal portion are The movable contact and fixed contact Respectively positioned above the position of the contact surface, when opened it is one that is configured to be positioned respectively below the position of the surface of the movable contact of the movable contactor.

The circuit breaker of the second invention has a movable contactor having a center of rotation and a movable contact fixed to one end, and the movable contactor can be brought into contact with and separated from the movable contact by rotation. A fixed contact, a fixed contact fixed to the tip and elastically supported so as to be rotatable about the base end side, and a conductor portion positioned in parallel and below the movable contact when closed.
And a connecting conductor having a conductor portion at one end and the other end connected to the terminal portion and forming a blowout coil for generating a magnetic field for extending and driving the arc generated between the contacts to the terminal portion side, When the direction in which the movable contact separates from the fixed contact by the rotation of the movable contact from the assembled state is upward, the current path above the blowout coil and the terminal portion have the movable contact when closed. The movable contactors are positioned above each other and below the movable contactor when opened.

The circuit breaker of the third aspect of the invention has a movable contactor having a center of rotation and a movable contact fixed to one end, and the movable contactor can be brought into contact with and separated from the movable contact by rotation. A fixed contact, a fixed contact fixed to the tip and elastically supported so as to be rotatable about the base end side, and a conductor portion positioned in parallel and below the movable contact when closed.
And a connecting conductor having a conductor portion at one end and the other end connected to the terminal portion and forming a blowout coil for generating a magnetic field for extending and driving the arc generated between the contacts to the terminal portion side, When the direction in which the movable contact is separated from the fixed contact by the rotation of the movable contact from the formed state is upward, the blowout coil is positioned at least on the rotation center side of the fixed contact when closed. And forming two sides substantially parallel to the movable contact, one side of the two sides is located below the movable contact, and the other side is located above the movable contact.
At the time of opening, the two sides are arranged below the movable contact.

A circuit breaker according to a fourth aspect of the present invention is the circuit breaker according to any one of the first to third aspects of the present invention, wherein the conductor portion is substantially L-shaped and forms a part of the blowout coil. In addition, the center of rotation of the movable contact is located above the contact surface of each contact when the movable contact is closed.

[0010]

According to the first and fourth aspects of the present invention, the magnetic field component that drives the movable contact in the opening direction is concentrated in the initial stage of opening the movable contact from the fixed contact, and the movable contact opens from the fixed contact. Immediately after releasing the movable contact, the opening speed increases,
Also, the conductor part to which the fixed contact is fixed is required to rotate in the direction opposite to the movable contact due to the action of the magnetic field by the blowout coil and the repulsive action of the movable contact, and then to drive the arc after the separation. Reach the minimum contact distance quickly,
The magnetic field of the blowout coil drives and extends the arc at an early point to improve the current limiting performance of the circuit breaker.

According to the second aspect of the invention, the magnetic field component that drives the movable contact in the opening direction is concentrated in the initial stage of the separation of the movable contact from the fixed contact, and the movable contact opens from the fixed contact. Immediately after separating, the opening speed of the movable contact increases, and the conductor part to which the fixed contact is fixed rotates in the direction opposite to the movable contact due to the action of the magnetic field by the blowout coil and the repulsion of the movable contact. And then after opening,
The minimum contact distance required to drive the arc is reached quickly, and the magnetic field of the blowout coil and the terminal portion drives and extends the arc at an early point to improve the current limiting performance of the circuit breaker.

According to the third invention, the magnetic field component for driving the movable contact in the opening direction is concentrated in the initial stage of the separation of the movable contact from the fixed contact, and the movable contact is opened from the fixed contact. Immediately after separating, the opening speed of the movable contact increases, and the conductor part to which the fixed contact is fixed rotates in the direction opposite to the movable contact due to the action of the magnetic field by the blowout coil and the repulsion of the movable contact. And then after opening,
The minimum contact distance required to drive the arc is quickly reached, and the arc is driven and extended only by the effect of the magnetic field of the blowout coil to improve the current limiting performance of the circuit breaker.

According to the fourth aspect of the invention, the magnetic field component for attracting the conductor portion by the current flowing through the movable contact at the initial stage of the separation of the movable contact from the fixed contact and driving the operating contact in the opening direction is generated. Immediately after the movable contact is separated from the fixed contact, the opening speed of the movable contact increases, and the conductor part to which the fixed contact is fixed causes the action of the magnetic field by the blowout coil and the movable contact. The repulsive action causes the contact to rotate in the opposite direction to the movable contact, and after opening, the minimum contact distance required to drive the arc is reached quickly, and the arc of the blowout coil causes the arc to reach an early point. Drive and extend with to improve the current limiting performance of the circuit breaker.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS.

First, the circuit breaker of the first invention will be described. In each of the drawings, FIG. 1 is a sectional view showing a main part of an embodiment of a circuit breaker of the first invention, showing a closed state where a movable contact and a fixed contact are in contact, and FIG. 1 shows a state in which the movable contact and the fixed contact in the circuit breaker shown in FIG. 1 are opened, and FIG. 3 shows a movable contact and a fixed contact of the circuit breaker of another embodiment of the first invention. It is a perspective view shown.

As shown in FIGS. 1 and 2, the circuit breaker according to the first embodiment of the present invention is different mainly in the structure of the portions corresponding to the movable contact 1 and the fixed contact 7, and other than these. It is constructed according to the conventional circuit breaker. That is, the movable contact 1 is composed of a linear conductor piece having the movable contact 2 fixed to the tip thereof, and the base end thereof is elastically supported by the conductor 13 fixed to the bottom of the container 12 via the shunt 14. It also has a center of rotation 15 at the base end. Further, below the movable contact 1, a linear conductor portion (repulsive conductor) 4A having a fixed contact 3 which can be brought into contact with and separated from the movable contact 2 and fixed to the tip is arranged. The repulsive conductor 4A has a shunt 16 at the base end.
It is elastically supported at one end of a connection conductor 4 described later via a rotary center 17 at its base end, and is parallel to the movable contact 1 in a closed state where the fixed contact 3 is in contact with the movable contact 2. And it is located below. The fixed contact 3 and the repulsive conductor 4A form a repulsion element. The connection conductor 4 has one end connected to the repulsive conductor 4A and the other end connected to the terminal portion 5A by the screw 6 as described above, and at the same time, an arc generated between the movable contact 2 and the fixed contact 3 is generated. A blowout coil for generating a magnetic field for extension driving to the terminal portion 5A side is formed. The connecting conductor 4 and the terminal portion 5A form a fixed conductor.

When the circuit breaker having the above structure is energized, the terminal portion 5A, the shunt 16, the connecting conductor 4, the repulsive conductor 4A, the fixed contact 3, the movable contact 2, the shunt 14,
A current flows through the conductor 13 and the path of the other terminal portion (see FIG. 18). Moves when the opening operation of the movable contactor 1 and the repulsion element (consisting of the fixed contact 3 and the repulsion conductor 4A) is started from the energized state by the action of the electromagnetic repulsive force or the mechanism section (corresponding to the number 9 in FIG. 18). The contact 2 is separated from the fixed contact 3 to generate an arc.

In this operation, when the direction in which the movable contact 2 separates from the fixed contact 3 by rotating the movable contact 1 from the closed state is upward, the movable contact 1 is the connection conductor 4. Due to the action of the magnetic field generated in the blow-out coil, in particular, the attracting force with the current path at the upper part of the blow-out coil and the repulsive force with the repulsion conductor 4A respectively cause rapid rotation upward about the rotation center 15. Simultaneously with this operation, the repulsion element acts on the action of the magnetic field generated in the blowout coil. Each of the repulsive forces rapidly rotates downward about the rotation center 17. Thus, the distance between the contacts at the initial stage of opening is rapidly increased, and the distance between the contacts quickly reaches the minimum value required to drive the arc.
Moreover, since the current path above the blowout coil is located close to the arc immediately after opening, the arc is effectively driven and extended toward the arc-extinguishing grid 8 by the magnetic field of the blowout coil. The arc voltage rises rapidly and the current is effectively limited.

Further, when the distance between the contacts increases, the movable contact 1 is positioned above the current path above the blowout coil as shown in FIG. 2, so that the arc caused by the magnetic field generated in the blowout coil is driven. Although the action of extending the arc is substantially eliminated, the arc is driven and extended toward the arc extinguishing grid 8 by the action of the arc extinguishing grid 8 and the action of the current path in the arc extinguishing space including the arc, and the current is cooled by the arc extinguishing grid 8. Is cut off.

Although the connection conductor 4 of the circuit breaker of the above embodiment is formed as a blowout coil having one or more turns, the connection conductor in the present invention has one turn as shown in FIG. Formed as a blow-out coil of less than. In this case, the repulsion element composed of the repulsion conductor 4A and the fixed contact 3 forms a current path under the blowout coil. In the circuit breaker to which the connecting conductor 4 is applied, the repulsion element is not driven rapidly as in the above-described embodiment, and the slit 4C is provided in the connecting conductor 4 to open / close the movable contact 1. However, the fixed conductor including the connecting conductor 4 and the terminal portion 5A can be easily manufactured by bending a single conductive material and assembling the repulsion member. Therefore, the manufacturing cost of the device can be reduced.

Next, the circuit breaker of the second invention is shown in FIG.
It will be described with reference to FIG. In each of the drawings, FIG. 4 is a view corresponding to FIG. 1 showing an essential part of one embodiment of the circuit breaker of the second invention, and FIG. 5 is a diagram showing the movable contact and the fixed contact of the circuit breaker shown in FIG. FIG. 6 is a diagram showing a state in which the above is done, and FIG. 6 is a diagram corresponding to FIG.

As shown in FIGS. 4 and 5, the circuit breaker of this embodiment has the same structure as the circuit breakers shown in FIGS. 1 and 2, except for the connecting conductor 4. That is, the circuit breaker of the present embodiment has a movable center 1 having a rotation center 14 and a movable contact 2 fixed to one end, and can be brought into contact with and separated from the movable contact 2 by rotating the movable contact 1. The fixed contact 3 is fixed to the front end and is elastically supported so as to be rotatable about the rotation center 17 of the base end, and is parallel and downward to the movable contact 1 when closed. Blowout which has a repulsive conductor 4A located and a repulsive conductor 4A at one end and the other end which is connected to the terminal portion 5A and which generates a magnetic field for extending and driving the arc generated between the contacts 2 and 3 to the terminal portion 5A side. And a connecting conductor 4 forming a coil.

When the direction in which the movable contact 2 is separated from the fixed contact 3 by the rotation of the movable contact 1 from the closed state is upward, the blowout coil forming the connection conductor 4 is formed. As shown in FIGS. 4 and 5, each of the upper current path and the terminal portion 5A is formed as a straight, same plane, and is positioned above the movable contact 1 when closed.
At the time of opening, they are arranged below the movable contactors 1, respectively.

Therefore, when the circuit breaker having the above structure is energized, like the circuit breakers shown in FIGS. 1 and 2, the terminal portion 5A, the shunt 16, the connection conductor 4, the repulsive conductor 4A, the fixed contact 3, and the movable contact. Current flows through the path of the contact 2, the shunt 14, the conductor 13 and the other terminal portion (see FIG. 18), and the action of the electromagnetic repulsive force or the mechanism portion (corresponding to number 9 in FIG. 18) from the energized state. When the opening operation of the movable contactor 1 and the repulsion element (including the fixed contact 3 and the repulsion conductor 4A) is started by the above, the movable contact 2 is separated from the fixed contact 3 and an arc is generated.

In this operation, since the tip of the movable contactor 1 is located in the blowout coil which is the connecting conductor 4, the action of the magnetic field generated in the blowout coil,
In particular, the current path above the blowout coil and the terminal portion 5
The movable contact 1 is rapidly rotated upward about the rotation center 15 by the attraction force with A and the repulsion force with the repulsive conductor 4A. Simultaneously with this operation, the repulsion element acts by the magnetic field generated in the blowout coil, particularly the repulsion conductor 4.
It rapidly pivots downward about the pivot center 17 by the attraction force with the current path below the blow-out coil adjacent to the lower part of A and the repulsive force with the movable contact 1. Thus, the distance between the contacts at the initial stage of opening is rapidly increased, and the distance between the contacts quickly reaches the minimum value required to drive the arc, and the influence of the magnetic field of the blowout coil and the terminal portion 5A. Since the arc is driven and extended in the direction of the arc extinguishing grid 8, the arc voltage sharply rises immediately after opening and the current is effectively limited. After that, the circuit breaker functions similarly to those shown in FIGS.

Further, although the connection conductor 4 of the circuit breaker of the above embodiment is formed as a blowout coil having one turn or more, the connection conductor in the present invention has one turn as shown in FIG. Formed as a blow-out coil of less than. The connecting conductor 4 shown in FIG. 6 is similar to that shown in FIG.
The slit 4C is provided in a portion through which This connecting conductor 4 can also achieve the same effect as that shown in FIG.

Next, the circuit breaker of the third invention is shown in FIG.
Description will be made with reference to FIG. In each of the drawings, FIG. 7 is a view corresponding to FIG. 1 showing a main part of one embodiment of the circuit breaker of the third invention,
FIG. 8 is a view corresponding to FIG. 1 showing a state where the movable contact and the fixed contact in the circuit breaker shown in FIG. 7 are opened, and FIGS. 9 to 11 are movable circuit breakers of other embodiments of the third invention. It is a figure corresponding to FIG. 3 which shows a contactor and a fixed contactor.

As shown in FIGS. 4 and 5, the circuit breaker of this embodiment is provided with a movable contact 1 and a repulsive conductor 4A similar to those of the circuit breakers shown in FIGS. Also,
The connecting conductor 4 in this embodiment has a repulsive conductor 4A at one end and the other end connected to the terminal portion 5A, and a magnetic field for extending and driving the arc generated between the movable contact 2 and the fixed contact 3 to the terminal portion 5A side. The blow-out coil to be generated is also constructed in the same manner as in the above-mentioned respective embodiments.

When the blowout coil is closed, it forms two upper and lower sides substantially parallel to the movable contact 1, and most of the two parallel sides are closer to the rotation center 14 side than the fixed contact 3. It is formed so as to be located at. In addition, one of the two sides is located below the movable contact 1, and the other one is located above the movable contact 1. However, at the time of opening, both of the above two sides are arranged below the movable contact 1. Further, the terminal portion 5A of the connection conductor 4 is bent and formed so as to be located below one side above the blowout coil.

Therefore, when the circuit breaker having the above-described structure is energized, the terminal portion 5A, the shunt 16, the connecting conductor 4, and the repelling conductor 4A are provided as in the circuit breakers shown in FIGS. 1, 2, 4, and 5. , Fixed contact 3, movable contact 2, shunt 14,
A current flows through the conductor 13 and the path of the other terminal portion (see FIG. 18), and the movable contactor 1 and When the opening operation of the repulsion (consisting of the fixed contact 3 and the repulsion conductor 4A) is started, the movable contact 2 is separated from the fixed contact 3 and an arc is generated.

In this operation, since the movable contact 1 is located in the blowout coil which is the connecting conductor 4 at its tip side, it operates in the same manner as the circuit breaker shown in FIGS. In the example, after the distance between the movable contact 2 and the fixed contact 3 reaches the minimum value for driving the arc, the arc is not affected by the magnetic field of the terminal portion 5A, and is affected by the magnetic field of only the blowout coil. It is received and driven and extended in the direction of the arc extinguishing grid 8.

Further, although the connection conductor 4 of the circuit breaker of the above-mentioned embodiment has been described as being formed as a blowout coil having one or more turns, the connection conductor in the present invention is as shown in FIGS. 9 to 11. It may be formed as a blowout coil of less than one turn. That is, the connecting conductor 4 shown in FIG. 9 is provided with the slit 4C only in a portion through which the movable contact 1 passes when the movable contact 1 is opened and closed. Further, in addition to the slit 4C, the connection conductor 4 shown in FIG. 10 may be provided with an exhaust slit 4D for exhausting gas generated by arc generation in a vertical portion continuous with the terminal portion 5A. Like the connection conductor 4 shown in FIG. 11, a slit 4E in which the above two slits 4C and 4D are continuous may be provided. These connecting conductors 4 are also shown in FIG.
The same effects as those shown in FIG. 7 can be expected.

Further, the circuit breaker of the fourth invention is shown in FIG.
It will be described with reference to FIG. In each of the drawings, FIG. 12 is a view showing a main part of one embodiment of the circuit breaker of the third invention, which corresponds to FIG. 1 showing an open state, and FIG. 13 is an opening view of the circuit breaker shown in FIG. FIG. 2 showing the state, FIG. 14 is a view showing the essential parts of another embodiment of the circuit breaker of the third invention, FIG. 1 showing the open state, and FIG. 15 showing the circuit interruption shown in FIG. 2 showing the opened state of the circuit breaker, FIG. 16 is a diagram showing the essential parts of still another embodiment of the circuit breaker of the third invention, FIG. 1 showing the opened state, and FIG. 17 showing FIG. FIG. 3 is a view corresponding to FIG. 2 showing an open state of the circuit breaker shown in FIG.

The circuit breaker of the embodiment shown in FIGS. 12 and 13 is provided with a movable contact 1 similar to the circuit breakers shown in FIGS. However, in the repulsive conductor 4A in the present embodiment, as shown in each drawing, the base end is connected to one end of the connecting conductor 4 that is linear in the horizontal direction, and the pivot center 17 is provided at this base end. .. Further, the repulsive conductor 4A includes a vertical portion 4F extending downward from the rotation center 17 to the connecting conductor 4 in the closed state, and a horizontal portion 4G bent from the vertical portion 4F by 90 ° and extended to the terminal portion 5A side. Is formed in an L shape. Further, the repulsive conductor 4A constitutes a part of the blowout coil together with the connecting conductor 4, and the rotation center 17 thereof is located above the contact surfaces of the movable contact 2 and the fixed contact 3 when closed. Has been done. Therefore, the repulsive conductor 4
The current path at the upper part of the blowout coil formed by A and the connection conductor 4 and the terminal portion 5A are respectively located above the positions of the contact surfaces of the movable contact 2 and the fixed contact 3 when closed,
At the time of opening, they are respectively located below the position of the surface of the movable contact 2 of the movable contact 1.

Further, in the circuit breaker of the embodiment shown in FIGS. 14 and 15, as shown in each drawing, the linear connecting conductor 4 formed in the same manner as in the above embodiment has the movable contactor when closed. 1
It is configured to be positioned above and below the movable contacts when opened. Further, an L-shaped repulsive conductor 4A having a vertical portion 4F formed longer than that of the above-described embodiment is rotatably connected to one end of the connection conductor 4. The movable contact 1 is configured to be parallel to the connection conductor 4 when the fixed contact 3 is in contact with the movable contact 2 and the contact is closed. Therefore, the repulsive conductor 4
The current path above the blowout coil formed by A and the connection conductor 4 and the terminal portion 5A are located above the movable contactor 1 when closed, and below the movable contactor 1 when opened. There is.

Further, in the circuit breaker of the embodiment shown in FIGS. 16 and 17, as shown in the respective drawings, the connecting conductor 4 has a vertical portion and a horizontal portion extending from the upper and lower ends of the vertical portion in opposite directions. And a terminal portion 5A, and a repulsive conductor 4 formed in an L shape at an extended end of a horizontal portion located above the terminal portion 5A.
A is rotatably connected as in the above embodiments. Then, when the fixed contact 3 contacts the movable contact 2 and is closed,
The movable contact 1 is configured to be parallel to the connection conductor 4. Therefore, the repulsive conductor 4A and the connection conductor 4 are
In the blowout coil formed by and, when closed, the horizontal portion of the connection conductor 4 and the horizontal portion of the repulsion conductor 4A are substantially parallel to the movable contactor 1, and most of these horizontal portions are both fixed contacts 3. It is located closer to the rotation center 14 side. At this time, the horizontal portion of the repulsive conductor 4A is located below the movable contact 1, and the horizontal portion of the connection conductor 4 is located above the movable contact 1. However, at the time of opening, both of the horizontal parts are arranged below the movable contact 1.

Therefore, in the circuit breaker shown in FIGS. 12 to 17, the repulsion element (fixed contact and repulsion conductor 4A) acts on the vertical portion 4F of the repulsion conductor 4A due to the current flowing through the movable contact 1. ) Is increased in the opening direction, and the distance between the contacts 2 and 3 at the initial opening can be increased more rapidly, and the repulsive force is elastic at the completion of opening. The maximum open position can be maintained for a long time against

[0038]

As described above, according to the first aspect of the present invention, when the movable contact is rotated from the closed state and the movable contact is separated from the fixed contact, the direction is set upward.
The current path above the blowout coil and the terminal portion are respectively located above the position of the contact surface of the movable contact and the fixed contact when closed, and from the position of the surface of the movable contact of the movable contact when opened. The circuit breaker having excellent current limiting performance can improve the rotation speed of the movable contactor at the initial stage of opening and increase the extension driving force of the arc to the terminal part side by arranging them respectively at the lower side. Can be provided.

According to the second aspect of the invention, when the direction in which the movable contact separates from the fixed contact due to the rotation of the movable contact from the closed state is upward, the current flowing through the upper part of the blowout coil is increased. The path and the terminal portion are respectively positioned above the movable contactor when closed, and are positioned below the movable contactor when opened, thereby improving the rotation speed of the movable contactor in the initial stage of opening. At the same time, it is possible to provide a circuit breaker having an excellent current limiting performance capable of increasing the extension driving force of the arc toward the terminal portion side.

According to the third aspect of the invention, the blowout coil is closed when the direction in which the movable contact is separated from the fixed contact by the rotation of the movable contact from the closed state is upward. Occasionally, at least two sides that are located closer to the center of rotation than the fixed contact and that are substantially parallel to the movable contact are formed, and one side of the two sides is located below the movable contact and the other side is The movable contactor is positioned above the movable contactor, and the two sides are positioned below the movable contactor at the time of opening, thereby improving the rotating speed of the movable contactor in the initial stage of opening, and at the same time, the arc terminal portion. It is possible to provide a circuit breaker having excellent current limiting performance capable of increasing the extension driving force to the side.

Further, according to the fourth invention, the conductor portion in the first to third inventions has a substantially L shape and forms a part of the blowout coil, and the rotation center of the conductor portion is closed. By positioning it above the contact surface between the movable contact and the fixed contact when it is completed, it is possible to improve the rotation speed of the movable contactor in the initial stage of opening, and to increase the extension driving force of the arc toward the terminal portion side. It is possible to provide a circuit breaker having excellent current limiting performance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of an embodiment of a circuit breaker of the first invention, showing a closed state in which a movable contact and a fixed contact are in contact with each other.

2 is a sectional view showing a state in which a movable contact and a fixed contact in the circuit breaker of FIG. 1 are opened.

FIG. 3 is a perspective view showing a movable contact and a fixed contact of a circuit breaker according to another embodiment of the first invention.

FIG. 4 shows an embodiment of the circuit breaker of the second invention.
It is a sectional view corresponding to.

5 is a cross-sectional view corresponding to FIG. 2 showing the circuit breaker of FIG.

FIG. 6 is a perspective view corresponding to FIG. 3, showing a circuit breaker of another embodiment of the second invention.

FIG. 7 shows an embodiment of the circuit breaker of the third invention.
It is a sectional view corresponding to.

8 is a sectional view corresponding to FIG. 2 showing the circuit breaker of FIG. 7.

FIG. 9 is a perspective view corresponding to FIG. 3, showing a circuit breaker of another embodiment of the third invention.

FIG. 10 is a perspective view corresponding to FIG. 3, showing a circuit breaker according to still another embodiment of the third invention.

FIG. 11 is a perspective view corresponding to FIG. 3 showing a circuit breaker according to still another embodiment of the third invention.

FIG. 12 is a sectional view corresponding to FIG. 1, showing an embodiment of the circuit breaker of the fourth invention.

13 is a cross-sectional view corresponding to FIG. 2 showing the circuit breaker of FIG.

FIG. 14 is a perspective view corresponding to FIG. 1 showing a circuit breaker of another embodiment of the fourth invention.

15 is a sectional view corresponding to FIG. 2, showing the circuit breaker of FIG.

FIG. 16 is a perspective view corresponding to FIG. 1, showing a circuit breaker according to still another embodiment of the fourth invention.

17 is a cross-sectional view corresponding to FIG. 2 showing the circuit breaker of FIG.

FIG. 18 is an overall sectional view showing an example of a conventional circuit breaker.

FIG. 19 is a cross-sectional view illustrating the opening and closing operation of the movable contactor of the circuit breaker of FIG. 18, (a) showing the flow of current in the closed state where the movable contact of the movable contactor contacts the fixed contact. Figure,
(B) is a figure which shows the behavior of the arc immediately after opening, (c) is a figure which shows the state which the arc extinguishing grid drives an arc.

[Explanation of symbols]

 1 Movable contactor 2 Movable contact 3 Fixed contact 4 Connection conductor forming blowout coil 5A Terminal part

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazunori Fukuya 1-8 Midoricho, Fukuyama-shi, Hiroshima Mitsubishi Electric Corporation Fukuyama Manufacturing (72) Inventor Shirou Murata 1-8 Midoricho, Fukuyama-shi, Hiroshima Mitsubishi Electric Corporation Fukuyama Works

Claims (4)

[Claims] 1. A movable contactor having a center of rotation and a movable contact fixed to one end, a fixed contact which can be brought into contact with and separated from the movable contact by the rotation of the movable contact, and a fixed contact at a tip. A conductor portion that is fixed and elastically supported rotatably around the base end side and that is located parallel to and below the movable contact when closed, and a conductor portion at one end and the other end The movable contactor is connected to the terminal portion and includes a connection conductor that forms a blowout coil that generates a magnetic field that drives the arc generated between the contacts to the terminal portion side. As a result, when the moving contact separates from the fixed contact in the upward direction, the current path above the blowout coil and the terminal portion are located above the contact surfaces of the movable contact and the fixed contact when closed. Located and opened respectively A circuit breaker characterized by being positioned below the position of the surface of the movable contact of the movable contact when completed. 2. A movable contact having a center of rotation and a movable contact fixed to one end, a fixed contact that can be brought into contact with and separated from the movable contact by rotating the movable contact, and a fixed contact at the tip. A conductor portion that is fixed and elastically supported rotatably around the base end side and that is located parallel to and below the movable contact when closed, and a conductor portion at one end and the other end The movable contactor is connected to the terminal portion and includes a connection conductor that forms a blowout coil that generates a magnetic field that drives the arc generated between the contacts to the terminal portion side. As a result, when the direction in which the movable contact separates from the fixed contact is upward, the current path and the terminal portion above the blowout coil are located above the movable contactor when closed, and when opened, Movable contact A circuit breaker characterized by being located below each 3. A movable contactor having a center of rotation and a movable contact fixed to one end, a fixed contact that can be brought into contact with and separated from the movable contact by the rotation of the movable contact, and a fixed contact at the tip. A conductor portion that is fixed and elastically supported rotatably around the base end side and that is located parallel to and below the movable contact when closed, and a conductor portion at one end and the other end The movable contactor is connected to the terminal portion and includes a connection conductor that forms a blowout coil that generates a magnetic field that drives the arc generated between the contacts to the terminal portion side. As a result, when the direction in which the movable contact is separated from the fixed contact is upward, the blowout coil is located at least on the rotation center side of the fixed contact and substantially parallel to the movable contact when closed. Form two sides Also, one side of the two sides is located below the movable contactor and the other side is located above the movable contactor, respectively, and at the time of opening, the two sides are respectively located below the movable contactor. Characteristic circuit breaker. 4. The conductor portion is substantially L-shaped and forms a part of the blowout coil, and the center of rotation of the conductor portion is located above the contact surface of each contact when closed. The circuit breaker according to claim 1.