JPH0620547A - Switch - Google Patents

Abstract

PURPOSE:To provide excellent current-limiting performance by causing all of the current paths of a fixed contact to generate electromagnetic forces that stretch an arc toward a terminal portion. CONSTITUTION:A fixed contact 4 comprises a first conductor portion 4a having a terminal portion 5 connected thereto, a second conductor portion 4e having a fixed contact 3, and a third conductor portion 4d, and the third conductor portion 4d is disposed nearer to the end portion of a movable contact 1 where a movable contact 2 is not provided than to the position of the fixed contact 3, and on the opposite side of the terminal portion 5. The first conductor portion 4a is disposed above the contact surface of the contact when the contact is closed, and below the contact surface of the movable contact 2 when the contact is closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch, such as a circuit breaker, a current limiter, or an electromagnetic contactor, in which an arc is generated in a container when the current is cut off.

[0002]

2. Description of the Related Art FIG. 39 is a side view showing a state in which a circuit breaker as a conventional switch is open, for example, FIG. 40 is a side view showing a state immediately after contact opening of the circuit breaker in FIG. 39, and FIG. It is a side view which shows the maximum open state of the movable contact in the circuit breaker of FIG. In the figure, reference numeral 1 denotes a movable contactor of a circuit breaker, and the movable contactor 1 rotates about a rotation fulcrum (rotation center) 14 of a base (see FIGS. 40 and 41). Is supported as. Reference numeral 2 denotes a movable contact fixed to one end (lower surface of the free end portion) of the movable contact 1, 3 is a fixed contact that comes in contact with and separates from the movable contact 2 by the rotation of the movable contact 1, and 4 is the fixed contact 3. The fixed contactor is provided at one end, and the shape configuration of the fixed contactor 4 will be described later.
Reference numeral 5 is a power source side terminal portion connected to the other end of the fixed contactor 4. Reference numeral 6 denotes an arc extinguishing plate, which functions to extend and cool the arc generated between the movable contact 2 and the fixed contact 3 when the movable contact 2 and the fixed contact 3 are separated. Reference numeral 7 is an arc-extinguishing side plate that holds the arc-extinguishing plate 6. Reference numeral 8 denotes a mechanism section for rotating the movable contactor 1. The mechanism section 8 has a built-in current detection section (not shown), and the current detection section operates by detecting a short-circuit current. Has become. Reference numeral 9 is a handle for manually operating the mechanism portion 8, 10 is a load side terminal portion, and 11 is a conductor for connecting the terminal portion 10 to the movable contact 1. Reference numeral 12 is a container for housing these circuit breaker components, and 13 is an exhaust hole provided in the wall of the container 12.

The shape of the fixed contact 4 will be described below. 39 to 41, the fixed contactor 4 includes a conductor portion 4a to which the terminal portion 5 on the power source side is connected and which extends in the horizontal direction, and the terminal portion 5 in the conductor portion 4a.
A vertical conductor portion 4b bent downward at an end portion on the opposite side, and a stepped lower conductor portion 4c extending horizontally from the lower end of the conductor portion 4b on the opposite side to the conductor portion 4a.
And a conductor portion 4d rising vertically from the tip of the conductor portion 4c, and the conductor portion 4a from the upper end of the conductor portion 4d.
It is formed integrally with a conductor portion 4e extending horizontally toward the side, and the fixed contact 3 is provided on the conductor portion 4e.

In the fixed contactor 4 having such a configuration, the conductor portion 4d connecting the lower conductor portion 4c with the fixed contact 3 side is movable from the position of the fixed contact 3 to the movable contact 1. The conductor portion 4e, which is located on the other end portion side where the contact point 2 is not fixed and is on the opposite side of the terminal portion 5 and has the fixed contact point 3
Is on the same horizontal plane as the conductor portion 4a having the terminal portion 5, and is located below the position of the contact surface when the movable contact 2 and the fixed contact 3 are closed. The fixed contactor 4 is used in an exposed state where the entire surface of the fixed contactor 4 is not insulated.

Next, the operation will be described. In the state of FIG. 39, the terminal portion 5 of the fixed contactor 4 is connected to the power source, and the terminal portion 10 on the load side is connected to the load. In this state, when the handle 9 is operated in the direction of the arrow B, the mechanism portion 8 operates and the movable contact 1 is lowered and rotated about the rotation fulcrum 14 (see FIGS. 40 and 41) of the base portion. The movable contact 2 comes into contact with the fixed contact 3 to be in a closed state, and power is supplied from the power source to the load. In this state, the movable contact 2 is pressed against the fixed contact 3 with a prescribed contact pressure in order to ensure the reliability of energization.

When a short circuit accident occurs in the circuit on the load side of the circuit breaker, and a large short circuit current flows in the circuit, the current detection section in the mechanism section 8 detects this large current and the mechanism section is detected. 8 is activated. As a result, the movable contact 1 is rotated in the contact opening direction so that the movable contact 2 is separated from the fixed contact 3. At the time of such contact opening, as shown in FIG.
0 and FIG. 41, the movable contact 2 and the fixed contact 3
Arc A is generated between and.

However, normally, when a large current such as a short-circuit current flows, the electromagnetic repulsive force at the contact surfaces of the movable contact 2 and the fixed contact 3 becomes very strong, and the contact pressure applied to the movable contact 2 is overcome. In addition, the movable contactor 1 has a mechanism portion 8
Rotate in the contact opening direction without waiting for the operation. Therefore, the rotation causes the movable contact 2 and the fixed contact 3 to be separated from each other, and the arc A generated between the contacts 2 and 3 is extended by the arc extinguishing plate 6 and cooled. As a result, the arc resistance rises, and a short-circuit current that limits the short-circuit current to a small level occurs,
At the current zero point, the arc A is extinguished and the current interruption is completed.

The current limiting is very important for improving the protection function of the circuit breaker. In order to improve the current limiting performance, it is necessary to increase the arc resistance as described above.

A method often used to extend the arc in order to increase the arc resistance is, for example, Japanese Patent Laid-Open No.
This is a method of using a fixed contactor having a shape as disclosed in Japanese Unexamined Patent Publication No. 0-49533 and Japanese Unexamined Patent Publication No. 2-68831. The shapes of the fixed contacts shown in these publications are basically the same as the shapes of the fixed contact 4 shown in FIGS. 39 to 41. The current path by the fixed contact 4 is shown in FIG.
9 to 41, from the power source side terminal portion 5 to the conductor portion 4
The fixed contact 3 is reached through a, 4b, 4c, 4d and 4e in order. In such a current path, the electromagnetic force exerted on the arc A by the current flowing through the current path 4e on the fixed contact 3 side of the fixed contact 4 is a force that extends the arc A toward the arc extinguishing plate 6. As a result, the arc resistance becomes higher and a circuit breaker with excellent current limiting performance can be obtained.

In order to improve the current limiting performance in the usual AC interruption, it is necessary to increase the arc resistance as described above, but in this case, the current still reaches the maximum value immediately after the contacts 2 and 3 are opened. The arc resistance must be increased before it becomes. Even if the arc resistance is increased after the current becomes large, the current is not easily limited due to the inertia effect of the current. On the contrary, since the current is high and the resistance is high, the arc energy generated in the circuit breaker is large and the circuit breaker is only severely damaged. Therefore, it is necessary to have a fixed contact shape in which the arc immediately after the contacts 2 and 3 are separated is greatly extended by a strong electromagnetic force and the arc resistance is rapidly increased.

[0011]

Since the conventional switch having a fixed contactor shape is constructed as described above, FIG.
As shown in 0, the current path of the fixed contactor 4 that generates an electromagnetic force that extends the arc A immediately after the contacts 2 and 3 are separated toward the power source side terminal portion 5 is a conductor portion having the power source side terminal portion 5. Only the conductor portion 4e on the fixed contact 3 side separated on the same plane as 4a, other current paths (conductor portions) 4a, 4b, 4c,
4d all generate an electromagnetic force that extends the arc A to the side opposite to the terminal portion 5. The electric currents of the conductor portions 4a and 4c flow in the opposite direction to the conductor portion 4e on the fixed contact 3 side, whereby
As a result, an electromagnetic force that extends the arc A in the direction opposite to the direction of the terminal portion 5 is generated. In addition, the current of the conductor portion 4b repels each other because of the opposite direction of the current of the arc A, and the current of the conductor portion 4d is in the same direction as the current of the arc A and attracts each other. The result is stretching in the opposite direction of. Therefore, the electromagnetic force that extends the arc A generated by the current path 4e toward the terminal portion 5 is reduced. Therefore, in the shape of the fixed contactor 4 used in the conventional switch, there is a problem that the electromagnetic force of the current flowing through the fixed contactor 4 does not act effectively because it extends the arc.

The invention of claim 1 has been made in order to solve the above problems, and all the current paths of the fixed contact immediately after the contact is opened have an electromagnetic force for extending the arc to the terminal side. As it is generated, the arc voltage can be rapidly raised, and when the contact opening distance of the movable contact increases, the arc is cooled and a high arc voltage can be generated and maintained, which is excellent. The purpose is to obtain a switch with current limiting performance.

It is an object of the present invention to obtain a switch in which the fixed contactor can be easily formed, but the fixed contactor does not interfere with the opening / closing operation of the movable contactor.

According to a third aspect of the invention, the opening / closing operation of the movable contact is not hindered by the fixed contact, and
In the initial stage of opening the movable contact, the arc is cooled and the current is limited, and in the latter half of the breaking operation, the pressure inside the container drops, and it is possible to obtain a switch in which the container is less likely to be damaged by the pressure. To aim.

According to a fourth aspect of the present invention, the arc voltage is made to rise more rapidly immediately after the contact is opened, the arc length immediately before the current interruption is effectively lengthened, the high arc voltage is maintained, and the short-circuit current is maintained. The purpose of the present invention is to obtain a switch capable of suppressing the passing energy at the time of interruption to be small.

It is an object of the invention of claim 5 to obtain a switch in which the effect of capturing an arc in the vicinity of the terminal portion connected to the fixed contact is increased, and the arc voltage maintaining action is increased.

According to a sixth aspect of the present invention, there is provided a switch which can accelerate the rise of the arc voltage in the initial stage of opening the movable contact, maintain a high arc voltage, and easily bend the fixed contact. The purpose is to get.

It is an object of the invention of claim 7 to obtain a switch capable of increasing the rise of the contact opening speed of the movable contact due to the electromagnetic force.

According to the invention of claims 8 to 10, it is possible to increase the magnetic field component for extending the arc on the surface of the fixed contact, and even if the fixed contact of the switch has a large current carrying capacity, The purpose of the present invention is to obtain a switch in which fixed contacts can be easily processed.

It is an object of the invention of claim 11 to obtain a switch which can improve the rise of the arc voltage and can maintain a high arc voltage.

It is an object of the present invention to provide a switch which can maintain a high arc voltage without causing an arc to return from the terminal side to the contact even in a large current region.

It is an object of the invention of claim 13 to obtain a switch which can further reduce the inflow of heat flow to the mechanism portion by further increasing the arc extending action and increasing the arc voltage.

It is an object of the invention of claim 14 to obtain a switch which can quickly reach the maximum contact distance of the movable contactor even when the current is cut off in a relatively small amount.

An object of the fifteenth aspect of the present invention is to provide a switch which can increase the arc extending action and the electromagnetic force for opening the movable contact to limit the size of the arc spot.

According to a sixteenth aspect of the present invention, there is provided a switchgear capable of reducing the inflow of heat flow into the mechanism portion side, preventing the inability to be turned on again after the current is cut off, and enhancing the arc cooling effect. The purpose is to get.

It is an object of the invention of claim 17 to provide a switch which can prevent melting of the movable contact due to an arc and can prevent a delay in insulation recovery due to a decrease in the amount of metal vapor generated.

It is an object of the present invention to provide a switch which can prevent the movable contact from dropping due to the influence of an arc and can increase the vertical mechanical strength of the movable contact. .

According to the nineteenth aspect of the present invention, the arc stretching force generated in the space on the fixed contact surface and in the vicinity above the fixed contact surface can be increased, the rise of the arc voltage can be improved, and sufficient mechanical enemy strength can be obtained. An object of the present invention is to obtain a switch that can prevent the deformation of the fixed contact when it is not present.

According to the invention of claims 20 and 21, the arc stretching force generated in the space on the fixed contact surface and in the vicinity thereof can be increased, the rise of the arc voltage can be improved, and the fixed contact can be improved. An object of the present invention is to obtain a switch capable of almost maximizing a magnetic field component extending an arc spot on the fixed contact side immediately before the interruption of a current that has moved to the terminal side and a space in the vicinity of the arc spot.

[0030]

According to a first aspect of the present invention, there is provided a switch having a movable contact having a movable contact at one end and a fixed contact which can be brought into contact with and separated from the movable contact by opening and closing the movable contact. In a switch equipped with a fixed contactor provided in a part and a terminal part connected to the other end of the fixed contactor, the direction in which the movable contact in the contact closed state is separated from the fixed contact is upward. At this time, the fixed contact is composed of a first conductor portion that connects to the terminal portion, a second conductor portion that has the fixed contact, and a third conductor portion that vertically connects the first conductor portion and the second conductor portion. The third conductor portion is arranged on the other end side of the movable contact, where the movable contact is not provided, and on the opposite side of the terminal portion from the position of the fixed contact, and the first conductor portion is closed by the contact. The contact is placed above the contact surface when the contact is made, and the contact is opened when the contact is opened. Disposed below the contact surface of the contacts,
A portion of the first conductor portion that can be seen from the surface of the movable contact when the contact is opened is covered with an insulator.

In the switch according to claim 2, the fixed contact is
A connecting conductor portion having a substantially U shape, a fixed contact fixed to the inside of one end portion of the U shape, and a terminal portion connected to the other end portion of the U shape; A slit for allowing the opening / closing operation of the movable contact with respect to the fixed contact is provided in a portion of the connection conductor located above the fixing surface of the fixed contact.

A switch according to a third aspect of the present invention is a fixed contactor structure in which a first conductor portion located above the fixed contact is formed on either the left or right of the plane of the locus drawn by the movable contactor during the opening and closing operation. It is what

In the switch according to a fourth aspect of the present invention, the terminal portion connected to the fixed contact is flush with the first conductor portion or above the first conductor portion or below the first conductor portion. And the terminal portion located below the first conductor portion is located above the contact contact surface in the contact closed state.

According to a fifth aspect of the present invention, in the switch, the terminal portion is
A fixed contact composed of a lead portion connected to the first conductor portion and a terminal plate portion connected to an external electric circuit, the terminal plate portion being arranged below a contact contact surface when the contact is closed. Is.

According to a sixth aspect of the present invention, in the switch, the first conductor portion connecting the terminal portion and the fixed contact is provided with a bent portion having an obtuse angle and opposite to the fixed contact, and the first conductor portion is provided. The shape of the fixed contact is such that the portion on the side opposite to the terminal portion from the bent portion is substantially parallel to the second conductor portion having the fixed contact.

A switch according to a seventh aspect of the present invention is a portion of a connecting conductor which connects a terminal portion and a fixed contact, which is directly connected to the fixed contact, and is located on the side opposite to the terminal portion from the position of the fixed contact when the switch is closed. The shape of the fixed contact has a portion substantially parallel to the movable contact.

In a switch according to an eighth aspect of the present invention, the first conductor portion connecting the terminal portion and the fixed contact is provided with a bent portion having an obtuse angle and opposite to the fixed contact, and the first conductor portion is provided. A second portion having a fixed contact fixed to a portion closer to the terminal portion than the bent portion of
The shape of the fixed contact is substantially parallel to the conductor.

In a switch according to a ninth aspect, the first conductor portion and the third conductor portion are continuous with each other through an obtuse-angled bent portion, and the third conductor portion and the second conductor portion are connected through an acute-angled bent portion. The shape of the fixed contactor is continuous and arranged so that the obtuse angle and the acute angle are convex on the side opposite to the fixed contact.

In the switch according to the tenth aspect of the present invention, the third conductor portion of the fixed contact is formed as a convex curve on the side opposite to the terminal portion.

A switch according to an eleventh aspect of the present invention is one in which a protruding portion protruding toward the fixed contact is provided on the first conductor portion of the fixed contact, and the apex of the protruding portion is positioned closer to the terminal portion than the fixed contact. Is.

In the switch according to the twelfth aspect of the present invention, in the fixed contact, one end portion of the second conductor portion provided with the fixed contact is disposed so that the contact surface of the fixed contact faces the terminal portion side from the vertical line in the vertical direction. It is located below the other end.

In the switch according to the thirteenth aspect of the present invention, the switch is fixed such that the conductor portion of the second conductor portion to which the fixed contact is fixed is located above the end portion of the second conductor portion which is continuous with the third conductor portion. The contactor is formed.

In the switch according to the fourteenth aspect, the first conductor portion and the third conductor portion are continuous with each other through an acute-angled bend portion, and the third conductor portion and the second conductor portion are obtuse-angled bend portions. And the fixed contact is formed so that the obtuse angle and the acute angle are convex on the side opposite to the fixed contact.

According to a fifteenth aspect of the present invention, in the switch of the fixed contact, the center line of the second conductor portion is located on a plane including a locus drawn by the movable contact by the opening and closing operation, and the second conductor portion. The width on the other end side to which the fixed contact is fixed is formed to be smaller than the width on the one end side on the side of the third conductor.

A switch according to a sixteenth aspect of the present invention includes a first conductor portion having a slit along a plane including a locus drawn by the movable contactor so as not to hinder the opening / closing operation of the movable contactor. Part is formed substantially symmetrical with respect to the plane including the locus, and the left and right conductor parts of the slit are formed substantially parallel to each other, or the width of the slit on the side opposite to the terminal part is the width of the terminal part side. The width of the fixed contact is formed smaller or the width of the slit on the side of the terminal portion is smaller than the width on the side opposite to the terminal portion and the terminal portion.

According to a seventeenth aspect of the present invention, in the switchgear, the movable conductor portion on the other end side where the movable contact is not fixed, and right next to the movable contact is set back from the fixed surface of the movable contact. It has a movable contact structure.

In the switch according to the eighteenth aspect, when the direction perpendicular to the plane including the locus of the movable contact drawn by the opening / closing operation is the left / right direction, the width in the left / right direction of the movable conductor forming a part of the movable contact. Is smaller than the width of the movable contact.

A switch according to a nineteenth aspect is provided with a first conductor portion having a slit along a surface including a locus drawn by the movable contact during the opening / closing operation, and including a center point P0 of a fixed contact surface,
In addition, in a cross section perpendicular to the plane including the locus and the current path of the first conductor portion, a line connecting the centers of gravity P1 and P2 of the cross sections of the first conductor portions on the left and right of the slit, and the center point P0.
And the fixed contacts are formed such that the angles θ1 and θ2 on the surface side including the locus formed by the lines connecting the center of gravity P1 and the center of gravity P2 are 45 ° or more.

A switch according to a twentieth aspect of the invention is provided with a first conductor portion having a slit along a surface including a locus drawn by the movable contact during the opening / closing operation, and including a center point P0 of a fixed contact surface,
In the plane including the locus and the cross section perpendicular to the current path of the first conductor portion, the plane side including the locus formed by the lines connecting the centers of gravity P1 and P2 of the cross sections of the first conductor portions on the left and right sides of the slit, respectively. The fixed contacts are formed so that the angles θ1 and θ2 are less than 45 °.

A switch according to a twenty-first aspect is provided with a third conductor portion having a slit along a surface including a locus drawn by the movable contact in the opening / closing operation, and the current of the surface including the locus and the third conductor portion. In a cross section perpendicular to the path, a line connecting the centers of gravity P1 and P2 of the cross sections of the respective third conductors on the left and right of the slit and a point PO ₁ where a perpendicular line extending upward from the center point P0 of the fixed contact surface intersects with the cross section And the angle θ1 on the plane side including the locus formed by the lines connecting the center of gravity P1 and the center of gravity P2.
And the fixed contactor is formed so that θ2 is 45 ° or more or less than 45 °.

[0051]

In the switch according to the invention of claim 1, immediately after the contact is opened, the arc is extended toward the terminal portion by all the current flowing through the conductor portion constituting the fixed contact, and thereafter the arc is the first conductor. A high arc voltage can be generated and maintained by being pressed against the insulator covering the part.

In the switch according to the second aspect of the invention, since the fixed contact has a substantially U-shape, the fixed contact can be easily molded. Further, in the fixed contact, by providing a slit for allowing the opening / closing operation of the movable contact at a conductor portion located above the fixing surface of the fixed contact, the opening / closing operation of the movable contact with respect to the fixed contact is performed as described above. It is not disturbed by the fixed contacts.

In the switch according to the invention of claim 3, the first conductor portion of the fixed contact is formed above the fixed contact on either the left or right of the plane of the locus drawn by the movable contact during the opening and closing operation. The opening / closing operation of the movable contact is not hindered by the fixed contact. Further, in the initial stage of opening the movable contactor, the arc generated between the contacts is cooled by the insulator covering the first conductor portion, so that the current is limited. Further, since the arc moves away from the insulator in the latter half of the breaking operation and the pressure generated in the container decreases, damage due to the pressure generated in the container during the breaking operation does not easily occur.

In the switch according to the invention of claim 4, since the terminal portion is arranged flush with or above the first conductor portion, the arc is extended immediately after the contact is opened by the electric current flowing through the terminal portion, and the arc voltage is further increased. Can be set up.
Further, by disposing the terminal portion above the first conductor portion, the arc length immediately before interruption can be effectively lengthened. In addition, since the terminal portion or a part of the terminal portion is arranged below the first conductor portion, a high arc voltage can be maintained, and the passing energy at the time of short-circuit current interruption can be suppressed to be small. Further, when the terminal portion is arranged below the first conductor portion and above the fixed contact contact surface, the arc in the vicinity of the fixed contact surface can be extended by the current of the terminal portion.

In the switch according to the invention of claim 5, since the terminal portion is located below the fixed contact surface, the effect of catching the arc in the vicinity of the terminal portion is increased, and the action of maintaining the arc voltage is increased. To do.

In the switch according to the invention of claim 6, the first conductor portion is provided with the convex obtuse bent portion on the side opposite to the fixed contact so that the terminal portion is located below the first conductor portion. The rise of the arc voltage in the very initial stage can be accelerated, a high arc voltage can be maintained, and the fixed contact can be easily bent.

According to a seventh aspect of the invention, the switch has a fixed contact having a portion of the second conductor portion opposite to the terminal portion from the position of the fixed contact and having a portion substantially parallel to the movable contact when the contact is closed. Since it is configured, the rising of the contact opening speed of the movable contact due to the electromagnetic force is increased.

In the switch according to the inventions of claims 8 to 10, when the first conductor portion is provided with an acute angle and a convex bent portion on the opposite side of the fixed contact, the first conductor portion and the third conductor portion are obtuse angles. In both cases, the magnetic field component that extends the arc on the fixed contact surface is increased, regardless of whether the third conductor part is formed as a convex curve on the side opposite to the terminal part when it is continuous through the bent part Can be made. In addition, as described above, when the third conductor portion is formed of a curved curve on the side opposite to the terminal portion, even a fixed contact of a switch having a large current carrying capacity can be easily processed.

The switch according to the invention of claim 11 is the first
By providing a protruding portion on the fixed contact side of the conductor portion and disposing the apex of this protruding portion on the terminal portion side from the fixed contact,
It is possible to improve the rise of the arc voltage and maintain a high arc voltage.

In the switch of the twelfth aspect of the invention, since the contact surface of the fixed contact is arranged to face the terminal portion side with respect to the vertical line in the vertical direction, the terminal is maintained even in a large current region in which the force blown out from the arc contact is large. It is possible to maintain a high arc voltage without the arc returning from the part side to the contact point.

The switch according to the invention of claim 13 is the second switch.
Since the conductor portion to which the fixed contact of the conductor portion is fixed is located above the end portion of the second conductor portion which is continuous with the third conductor portion, the arc extending action by the current of the third conductor portion is prevented. As the number of arcs increases, the reflection of pressure from the container to the arc extruded toward the terminal portion is hindered, so that the arc is more easily elongated and the arc voltage increases. In addition, it is possible to reduce the inflow of heat flow into the mechanism section side.

The switch according to the invention of claim 14 is the first switch
By making the conductor portion and the third conductor portion continuous through the bent portion at an acute angle, it is possible to apply an electromagnetic force that promotes the opening of the movable contact to the movable contact until the latter half of the opening operation. The maximum opening distance can be reached quickly even during relatively small current interruption operations.

In the switch according to the fifteenth aspect of the present invention, the center line of the second conductor portion is located on the plane including the locus drawn by the movable contact, and the third conductor portion of the second conductor portion is located. Since the other end where the fixed contact is fixed is made smaller than the width of the one end on the side to concentrate the current on the center line, the action of extending the arc and the electromagnetic force for opening the movable contact increases. At the same time, the size of the arc spot can be limited.

In the switch of the sixteenth aspect of the present invention, the slit (notch portion) is provided so as not to interfere with the opening / closing operation of the movable contact.
Since the width of the slit on the side opposite to the terminal portion is smaller than the width on the terminal portion side, the heat flow to the mechanism portion can be reduced. , It can be prevented that the power cannot be turned on again after the breaking operation. On the other hand, if the width of the slit on the terminal portion side is smaller than the width on the side opposite to the terminal portion, the cooling effect of the insulator can be enhanced.

According to a seventeenth aspect of the present invention, in the switch, the movable conductor is located on the other end side where the movable contact of the movable conductor is not fixed to the movable contactor, and the movable conductor is located immediately beside the movable contact.
Since it is set back from the fixed surface of the movable contact, it is difficult for the arc to touch the above-mentioned portion, the melting of the movable contact can be prevented, and the amount of metal vapor generated is reduced, so that delay in insulation recovery can be prevented.

In the switch according to the eighteenth aspect of the present invention, since the width of the movable conductor forming a part of the movable contact in the left-right direction is smaller than the width of the movable contact, the fixed surface of the movable contact is hidden from the arc. The movable contact can be prevented from falling off, and the vertical mechanical strength of the movable contact increases.

A switch according to a nineteenth aspect of the present invention is provided with a first conductor portion having a slit along a plane including a locus drawn by the movable contact during the opening / closing operation, and the center point P0 of the fixed contact surface.
And a line connecting the centers of gravity P1 and P2 of the cross sections of the first conductors on the left and right sides of the slit, and the center point P0 in a cross section perpendicular to the current path of the first conductor and the plane including the trajectory. Since the angles θ1 and θ2 on the surface side including the locus formed by the lines connecting the centers of gravity P1 and P2 are arranged to be 45 ° or more, the force for extending the arc in the space above and below the fixed contact surface Can be increased and the rise of the arc voltage can be improved.

In the switch according to the invention of claim 20, since the angles θ1 and θ2 in claim 19 are set to less than 45 °, the electromagnetic force applied to each part of the fixed contact can be reduced, and sufficient mechanical strength can be obtained. Can prevent deformation of the fixed contactor when

According to a twenty-first aspect of the invention, a switch is provided with a third conductor portion having a slit along a plane including a locus drawn by a movable contact, and the plane including the locus and a current path of the third conductor portion are provided. On a vertical plane, a line connecting the centers of gravity P1 and P2 of the cross sections of the respective third conductors on the left and right of the slit, and a point PO _{1 at} which a perpendicular line extending upward from the center point P0 of the fixed contact surface intersects with the cross section S0 and Center of gravity PI and center of gravity P2
Angles θ1 and θ on the surface side including the locus formed by the lines connecting
Since 2 is set to be 45 ° or more or less than 45 °, when the angles θ1 and θ2 are 45 ° or more, it is possible to increase the force for extending the arc in the space on and above the fixed contact surface. It is possible to improve the rise of the arc voltage. Further, when the angles θ1 and θ2 are less than 45 °, the magnetic field component that extends the arc spot on the fixed contact side immediately before breaking moved from the fixed contact to the terminal side and the arc in the space above it is almost maximum. Can be

[0070]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of an arc extinguishing section showing a closed state of a circuit breaker as a switch according to an embodiment of the invention as shown in FIG. 1, and FIG. 2 shows an opened state of the circuit breaker of FIG. 39 is a side view shown, and the same or corresponding portions as those in FIGS. 39 to 41 are denoted by the same reference numerals to omit redundant description. In the figure, 4
Is a fixed contactor having a fixed contact 3 at one end,
The fixed contactor 4 includes a first conductor portion 4a and a second conductor portion 4e.
And a third conductor portion 4d.

More specifically, in the contact closed state of FIG. 1, when the direction in which the movable contact 2 of the movable contact 1 separates from the fixed contact 3 is upward, the fixed contact 4 is connected to the power source side. A first conductor portion 4a connected to the terminal portion 5 and extending in the horizontal direction, a second conductor portion 4e spaced below the first conductor portion 4a, a second conductor portion 4e and the first conductor portion 4a. Is integrally formed into a shape composed of a third conductor portion 4d which is vertically connected to the opposite side of the terminal portion 5, and the fixed contact 3 is fixed on the second conductor portion 4e to fix the fixed contact 3 to the fixed conductor 3. It is configured to be located below the first conductor portion 4a.

The fixed contactor 4 has the fixed contact 3
The third conductor portion 4d is located on the other end side where the movable contact 2 of the movable contactor 1 is not fixed from the position of (4) and on the opposite side of the terminal portion 5 (the rotation fulcrum 14 side of the movable contactor 1). It is attached and set to the container 12 in the direction to do. in this case,
The first conductor portion 4a is located above the contact contact surface when the movable contact 2 is in contact with the fixed contact 3 when the contact is closed, and below the contact surface of the movable contact 2 when the contact is opened. is there.

The arc-extinguishing plate 6 shown in FIGS. 1 and 2 has a notch (not shown) for preventing the movable contact 1 from rotating. 1 and 2, the mechanical section 8, the handle 9 and the load side terminal section 10 in the conventional circuit breaker shown in FIG. 39 are omitted, and these are naturally contained in the container 12. It is arranged.

FIGS. 3 (a) and 3 (b) are perspective views showing a fixed contact according to an embodiment of the present invention. Figure 3 (a)
The fixed contactor 4 shown in FIG.
e and the third conductor portion 4d are integrally formed in a substantially U shape, and the power source side terminal portion 5 is connected to the power source connection side end portion of the first conductor portion 4a which is one end of the U shape. There is. In addition, the inside of the U-shape which is the opposite end, that is,
The fixed contact 3 is fixed to the upper surface of the second conductor portion 4e. Further, in the fixed contactor 4, the connection conductor portions (first conductor portion 4a and third conductor portion 4d) located above the fixing surface of the fixed contact 3 have fixed contacts 3 on the second conductor portion 4e. A slit 40 is provided so as not to interfere with the opening / closing operation of the movable contactor 1 with respect to.

In FIG. 3B, reference numeral 15 is an insulator, and this insulator 15 causes the surface of the fixed contactor 4 and the inner surface of the slit 40 to be in the vicinity of the connection portion of the terminal portion 5 of the first conductor portion 4a. To the third conductor portion 4d.

Next, the operation will be described. When a large current such as a short-circuit current flows, the movable contact 1 rotates without waiting for the operation of the mechanism section to separate the movable contact 2 and the fixed contact 3, and an arc A is generated between these contacts 2 and 3. What to do is the same as the conventional one. FIG. 4 shows a state in which the contact surface of the movable contact 2 is still below the first conductor portion 4a immediately after the contacts 2 and 3 are separated. Here, the arrow indicates the current, and the arc extinguishing plate 6 is omitted for simplicity.

All current paths formed from the terminal portion 5 to the first conductor portion 4a are above the arc A. As a result, the electromagnetic force acting on the arc A generated by the current path becomes a force that extends the arc A toward the terminal portion 5. Then, since the current flowing through the third conductor portion 4d is in the opposite direction to the current of the arc A, the electromagnetic force due to the current flowing through the third conductor portion 4d also becomes a force that extends the arc toward the terminal portion 5 side. Therefore, the electromagnetic force generated by the current flowing through the fixed contact 4 is a force that extends the arc A toward the terminal portion 5 side.
As a result, the arc A immediately after the contact is opened is strongly extended, and the arc resistance sharply increases.

FIG. 5A is a side view of the movable contact and the fixed contact shown for explaining the magnetic field strength distribution generated by the current flowing through the fixed contact of the first embodiment, and FIG. 5
It is the sectional view on the AA line of (a). In the figure, 41 is the center of gravity of each cross section of the first conductor portion 4a on both the left and right sides of the slit 40. FIG. 5 (c) is a magnetic field strength distribution on the Z axis of FIG. 5 (b) created by the current flowing through the fixed contactor 4 obtained by theoretical calculation, and the positive direction magnetic field extends the arc toward the terminal portion 5 side. It is a magnetic field component. As shown in FIG. 5 (c), the first conductor portion 4a is located at a position displaced to the left and right from the plane on which the movable contact 1 rotates.

In such a conductor arrangement, the second conductor portion 4e
And due to the influence of the current flowing through the third conductor portion 4d, the arc A reaches the space above the first conductor portion 4a (zone Z0).
Exists to the terminal portion 5 side. Therefore, as shown in FIG. 6, even if the movable contact surface is rotated above the first conductor portion 4a, the arc A receives a force on the terminal portion 5 side at the slit 40 portion of the first conductor portion 4a. It is cooled by being pressed against the insulator 15a that covers the inner portion of the slit 40 (the inner surface of the end portion of the slit 40 on the terminal portion 5 side).
As a result, the arc resistance that sharply increased immediately after contact opening increased further, and since a high arc voltage was maintained, the current peak and passing energy could be suppressed to a small level,
A circuit breaker with excellent current limiting performance is obtained.

In the first embodiment, the slit 40 for preventing the rotation of the movable contact 1 from being disturbed is provided in the fixed contact 4 which is provided symmetrically with respect to the rotating surface of the movable contact 1. Although the shape has been described, the same effect can be obtained even if the fixed contactor 4 has a shape configuration as shown in FIG. 7.

Example 2. FIG. 7A is a perspective view of a fixed contact according to an embodiment of the invention of claim 3, and FIG.
It is a perspective view showing the state where the fixed contact child of (a) was insulated. As shown in FIG. 7A, the fixed contactor 4 according to the second embodiment has the first conductor portion 4a only on the left side toward the terminal portion 5 side.
Has a shape configuration. In the case of the fixed contactor 4, as shown in FIG. 8A, in the upper half of the arc A at the initial stage of opening the movable contactor, the current of the arc A and the current of the first conductor portion 4a only on the left side are the same. The arc A is attracted to the first conductor portion 4a only on the left side, and the insulator 15 covering the first conductor portion 4a is strongly touched and cooled. Therefore, the arc voltage rises more quickly in the initial stage of the opening.

On the other hand, when the movable contacts 2 are positioned above the first conductor portion 4a by further separating the contacts 2 and 3, FIG.
As shown in (b), in the lower half of the arc A, the arc current and the current of the first conductor portion 4a on the left side are in opposite directions and repel each other. Therefore, the arc A is the first conductor on the left side only. The distance from the insulator 15 that covers the portion 4a is reduced, the amount of vapor generated from the insulator 15 is reduced, and the pressure increase in the container 12 due to the increase in current can be reduced.
The damage of 2 can be prevented in advance.

In other words, if the first conductor portion 4a of the fixed contactor 4 with respect to the rotating surface of the movable contactor 1 is left or right as in the second embodiment, the current limiting effect is excellent and the container 12 by pressure is excellent. Fixed contactor 4 with a shape configuration that does not easily cause damage
Can be obtained.

In the first embodiment, the terminal portion 5 is replaced by the first conductor portion 4
Although it is flush with a, the fixed contactor 4 of FIG. 7 has only one of the left and right first conductor portions 4a as in the second embodiment.
By so doing, a current component flowing through the terminal portion 5 also generates a magnetic field that extends the arc near the surface of the fixed contact 3 toward the terminal portion 5 side, and the arc at the initial stage of contact opening is effectively extended.

Example 3. FIG. 9 is a side view of a main part according to an embodiment of the invention of claim 4. In this embodiment, the terminal portion 5 on the power supply side is arranged above the first conductor portion 4a. In this way, when the terminal portion 5 is positioned above the first conductor portion 4a, a part of the current of the arc A extended to the vicinity of the terminal portion 5 attracts the current of the terminal portion 5, so that the arc A becomes large. Effective arc A just before the interruption
Can be extended.

As described above, since the arc length immediately before interruption can be lengthened by the electromagnetic force, the arc extending action immediately before interruption by the electromagnetic force such as interruption operation of a relatively small current in a relatively high voltage circuit has an effect on interruption performance. It is effective when it has a significant impact.

Example 4. FIG. 10 is a side view of a main part according to another embodiment of the invention of claim 4. In the fixed contactor 4 according to this embodiment, the terminal portion 5 is located below the first conductor portion 4a,
In addition, the fixed contact 3 is formed above the surface of the fixed contact 3. In this way, the terminal portion 5 of the fixed contactor 4 is
If it is below the conductor portion 4a, an upward current component is generated in a part of the fixed contactor 4 on the terminal portion 5 side of the arc,
Since this current component attracts the arc A, it is possible to capture the extended arc A by opening the contacts 2 and 3 to some extent near this upward current. Therefore, it is possible to prevent the arc A from being pulled back between the contacts 2 and 3 during the interruption operation, and it is possible to maintain a high arc voltage.

Further, as described above, by disposing the terminal portion 5 located below the first conductor portion 4a above the surface of the fixed contact 3, the current of the terminal portion 5 causes an arc on the surface of the fixed contact 3. A magnetic field component that extends A is generated, and the rise of the arc voltage can be accelerated.

Example 5. FIG. 11 is a side view of a main portion according to another embodiment of the invention of claim 4 and the embodiment of the invention of claim 5. The fixed contactor 4 according to this embodiment includes a terminal portion 5
Is located below the surfaces of the first conductor portion 4a and the fixed contact 3, and the terminal portion 5 has the first conductor portion 4a.
The function and effect obtained by being located below a is the same as in the case of the fourth embodiment. In addition, as in the fifth embodiment,
Since the terminal portion 5 is further below the surface of the fixed contact 3, the upward current component that supplements the arc increases and the supplement effect increases, and in the latter half of the breaking operation,
A higher arc voltage can be maintained. Therefore, the time until the completion of the current interruption is shortened, and it becomes possible to reduce the total energy amount and the passing energy generated inside the circuit breaker by the interruption operation.

Example 6. 12 and 13 are claims 6
FIG. 6 is a side view of a main part according to the embodiment of the invention of FIG. The fixed contactor 4 according to this embodiment has a shape configuration in which a first conductor portion 4a having a convex bent portion is integrally formed on the side opposite to the fixed contact 3. In the case of this fixed contactor 4, the supplementary effect due to the above-mentioned current component is reduced, but when the current is relatively small at the initial stage of contact opening, a part of the arc A near the movable contact 2 can be efficiently pulled. Therefore, the initial rise of the arc voltage can be accelerated. In addition, the bent portion of the first conductor portion 4a is formed at an obtuse angle, which facilitates bending of the fixed contactor 4. Furthermore, the terminal portion 5
When the position is defined in relation to the connection with the external circuit, the first conductor portion 4a is connected to the terminal portion 5 as shown in FIGS.
It is arranged higher, which inevitably increases the length of the third conductor portion 4d and increases the repulsive action of the downward current of the third conductor portion 4d and the upward current of the arc A. The extension of is promoted.

Example 7. FIG. 14 is a side view of the essential part according to the embodiment of the invention of claim 7. In the seventh embodiment, instead of the second conductor portion 4e to which the fixed contact 3 of the fixed contact 4 is fixed in the first embodiment, the second conductor portion 4e is moved in the direction of the rotation center 14 of the movable contact 1. Extend the second conductor portion 4
The current flowing through the portion e is configured so as to be substantially parallel to the current flowing through the movable contact 1 at the time of closing and in the opposite direction. With such a configuration, the electromagnetic force that extends the arc A due to the current of the second conductor portion 4e toward the terminal portion 5 side increases, and the electromagnetic force is generated between the movable contact 1 and the second conductor portion 4e at the time of closing. Since the repulsive force acts, the rotating speed of the movable contactor 1 increases, and the arc length immediately after the contact is opened increases rapidly. Therefore, the arc resistance rises faster and the current limiting performance is further improved.

Example 8. FIG. 15 is a side view of a main part according to an embodiment of the invention of claim 8. In the fixed contactor 4 according to this embodiment, since the portion of the first conductor portion 4a connected to the third conductor portion 4d is formed obliquely, the magnetic field strength extended to the arc A on the surface of the fixed contact 3 is increased. It becomes possible.

The above will be described in more detail below. Ideally, in order to maximize the magnetic field strength in the direction of extending the arc at the center of the surface of the fixed contact 3 created by the fixed contact 4, the center of the surface of the fixed contact 3 is made the center and the arc A is extended. It is necessary to arrange the conductor portion of the fixed contactor 4 on a cylindrical surface having a radius that maximizes the magnetic field in the direction and perpendicular to the rotating surface of the movable contactor 1. However, the radius differs depending on the shape of the conductor portion of the fixed contactor 4.

For example, as shown in FIG. 3, the first symmetrically symmetric first and second slits 40 sandwiching the rotary surface of the movable contact 1 are provided.
When the conductor portion 4a is arranged, half the distance between the left and right conductor portions is the radius. However, in practice, it is difficult or very costly to arrange the conductor portion completely along such a cylindrical surface. Therefore, a conductor portion shape that is as close as possible to the ideal cylinder and is easy to process is required.

As in the first embodiment, the smaller the number of bent portions of the fixed contactor 4 is, the easier the processing is. However, the conductor portion of the fixed contactor 4 is displaced from the position of the ideal cylinder in many portions. Therefore, as shown in FIG. 15, by increasing the bent portion in the first conductor portion 4a, the deviation from the ideal cylinder is reduced, the magnetic field strength for extending the arc on the surface of the fixed contact 3 is increased, and the processing cost is increased. It is possible to minimize the above.

Example 9. FIG. 16 is a side view of the main part according to the embodiment of claim 9. In the fixed contactor 4 according to this embodiment, the first conductor portion 4a and the third conductor portion 4d are connected to each other through the obtuse-angled bent portion Δ1, and the third conductor portion 4d and the second conductor portion 4e have an acute angle. Continuing through the bending part Δ2,
The third conductor portion 4d is formed obliquely so that the obtuse angle and the acute angle are convex on the side opposite to the fixed contact 3. According to the ninth embodiment, the deviation from the ideal cylinder can be made smaller than that in the first embodiment without increasing the number of the bent portions.

By the way, in the case of a circuit breaker having a large current-carrying capacity, the cross section of the conductor portion of the fixed contact 4 becomes large, and FIG.
Bending with a small radius as shown in FIG. 16 becomes difficult.

Example 10. FIG. 17 is a side view of a main part according to the tenth embodiment. In the fixed contactor 4 according to this embodiment, the third conductor portion 4d is formed in a curved shape protruding toward the side opposite to the fixed contact 3. As a result, the fixed contact 1
Even if the cross section of the conductor is large, the conductor can be arranged close to the ideal shape of the conductor, so that the arc voltage rises quickly.

Example 11. 18 (a) is a side view of the main part showing a state immediately after contact opening according to the embodiment of the invention of claim 11, and FIG. 18 (b) is a main part showing the maximum open state of FIG. 18 (a). It is a side view. In the fixed contactor 4 according to this embodiment, the first conductor portion 4a is provided with a protruding portion _4ax that is convex toward the fixed contactor 4 side, and the apex of this protruding portion _4ax is located closer to the terminal portion 5 side than the fixed contact 3. It is configured to do. According to this configuration, in the initial stage of contact opening, the arc A is attracted by the current component flowing diagonally above the protruding portion 4 _ax as shown in FIG. It is possible to speed up the rise of the arc voltage. Further, as shown in FIG. 18B, when the contacts 2 and 3 are further separated and the arc length becomes long, the arc A
Is the terminal portion 5 from the top of the protruding portion 4 _ax of the first conductor portion 4 a.
It is stretched to the side. At this time, the current component flowing diagonally below the protruding portion 4 _ax and the arc current repel each other in opposite directions, so that the arc A is prevented from returning in the direction between the contacts 2 and 3, and a high arc voltage can be maintained. .

Example 12. FIG. 19 is a side view of a main portion according to the embodiment of claim 12. In the fixed contactor 4 according to this embodiment, one end portion of the second conductor portion 4e to which the fixed contact point 3 is fixed is arranged below the other end portion, and the contact surface of the fixed contact point 3 is a terminal portion from a vertical line in the vertical direction. It is configured to face the 5 side. With such a configuration, the blowing direction of the arc A on the fixed contact 3 can be directed to the terminal portion 5 side.

Generally, when the current of the arc A becomes large,
The force of the arc blown from the contact surface becomes large, and the effect of the magnetic field stretching becomes relatively small. Therefore, the arc stretched by the magnetic field in the relatively small current region in the initial stage of the breaking operation may be pulled back in the direction between the contacts as the current increases and the arc voltage may drop.

Therefore, when the arc blowing direction is directed to the terminal portion 5 side as shown in FIG. 19, the arc A does not return to the side between the contacts 2 and 3 and the arc voltage is maintained even if the force blowing out by the arc A becomes large. It becomes possible.

Example 13. FIG. 20 is a side view of the main part according to the embodiment of the invention of claim 13. In the fixed contactor 4 according to this embodiment, the conductor portion to which the fixed contact 3 of the second conductor portion 4e is fixed is the second conductor portion 4e and the third conductor portion 4d.
The shape configuration is such that it is located above the connection part of.
With such a configuration, the current path of the third conductor portion 4d becomes long, and the force of pushing the arc A due to the current flowing through this current path toward the terminal portion 5 side increases. In addition, fixed contact 3
The conductor portion of the second conductor portion 4e closer to the third conductor portion 4d moves away from the arc. Therefore, even if the arc diameter increases as the arc current increases, the arc is difficult to spread on the mechanism portion side (generally, the mechanism portion is disposed on the rotation center 14 side of the movable contact 1), and the mechanism portion is difficult. Since it is possible to prevent the heat flow into and to the melt from flowing into the heat flow, it is possible to prevent the opening / closing operation from being disabled after the shutoff operation.

Although the container is not shown in the thirteenth embodiment (FIG. 20), a space can be provided between the conductor part and the container by raising the conductor part to which the fixed contact 3 is fixed. . If this space does not exist, the pressure generated by the arc A, in which the terminal portion 5 is pushed out of the fixed contact 3 into the ring, is reflected to the container portion in the vicinity, so that the arc is less likely to be pushed out into the ring. . Therefore, by moving away the adjacent container portion, it is possible to suppress the reflection of the arc pressure and generate an airflow in which the arc A is easily pushed out to the terminal portion 5 side.

Example 14. 21 is a side view of a main portion according to the embodiment of the invention of claim 14. FIG. In the fixed contactor 4 according to this embodiment, the connecting portion between the second conductor portion 4e and the third conductor portion 4d has an acute angle, and the second conductor portion 4e is not provided with a bent portion. The same effect as in the case of Example 13 can be obtained.

Example 15. 22 is a side view of a main part according to an embodiment of the invention of claim 15. As shown in FIG. In the fixed contactor 4 according to this embodiment, the third conductor portion 4d is formed obliquely so that the upper portion of the third conductor portion 4d is closer to the rotation center 14 side of the fixed contactor 1 than the lower portion. . With such a configuration, a part of the movable contactor 1 and the second conductor part 4a and the second conductor part 4a are retained for a relatively long period from the initial stage of contact opening to the latter half of contact circuit operation.
The movable contact 1 is in the space surrounded by the conductor portion 4e and the three conductor portion 4d, and the movable contact 1 is fixed to the fixed contact 4 for a relatively long time.
The magnetic field generated by the current flowing through the contacts receives a force in the contact opening direction. For this reason, the movable contact 2 is not limited to the initial contact opening.
Since the opening speed of the movable contactor 1 does not decrease even after appears at the upper part of the first conductor portion 4a, it is possible to shorten the time to reach the maximum opening distance.

Generally, in the breaking operation of a relatively small short-circuit current region in a circuit having a relatively high power supply voltage (for example, 550V), the electromagnetic repulsive force acting on the movable contact 1 is small and the contacts are opened even immediately before breaking the current. Since the separation distance is small, insulation failure may occur between contacts, resulting in failure of interruption. Therefore, as shown in FIG. 22, it is possible to prevent the above-mentioned disconnection failure by arranging to accelerate the time for reaching the maximum contact separation distance.

FIG. 23 is a view of the second conductor portion 4e of FIG. 22 as seen from above. As shown in FIG. 23, the second conductor portion 4e has a narrower conductor width to which the fixed contact 3 is fixed. The current flowing through the second conductor portion 4e is concentrated on the fixed contact 3 side along the center line of the conductor portion as much as possible. By concentrating the current in this way, the second
The magnetic field component that extends the arc A near the fixed contact 3 formed by the current of the conductor portion 4e is increased. In addition, the electromagnetic repulsive force with the current flowing through the conductor of the movable contact 1 increases and the movable contact 1
The opening speed of the will increase.

Due to such an effect, the arc voltage rises quickly and the current limiting performance is improved. In addition, the arc diameter generally expands as the arc current increases.
When the conductor width of the portion where the fixed contact 3 is fixed as shown in 3 is narrowed, the spread of the arc diameter is suppressed and the arc current density increases, so that the arc resistance increases and the high arc voltage can be maintained. It will be possible.

Example 16. 24A is a view of the movable contact 1 and the fixed contact 4 according to an embodiment of claim 16 as seen from above, and FIG. 24B is a side view of FIG. 24A.
In this embodiment, the fixed contactor 4 is provided with a slit 40 for preventing the opening / closing operation of the movable contactor 1, and the left and right conductor portions 4a, 4a of the slit 40 are arranged substantially parallel to each other. There is.

Example 17 FIG. 25 is a view of the movable contact 1 and the fixed contact 4 according to another embodiment of the invention of claim 16 as seen from above. In this embodiment, the slit 40 of the fixed contactor 4 is formed so that the width of the movable contactor 1 on the side of the rotation center 14 becomes gradually smaller than the width on the side of the terminal portion 5. By forming the slit 40 in such a shape, it is possible to prevent the heat flow from flowing toward the rotation center 14 during the shutoff operation.

In general, a mechanism portion for opening and closing the movable contact 1 is present on the side of the center of rotation 14 of the movable contact 1, and the melt adheres to the mechanism due to the heat flow, which causes a re-operation after the interruption operation. It will cause the input impossible. Further, the heat flow may cause an arc to ignite at a conductor portion on the side of the rotation center 14 with respect to the movable contact 2 of the movable contact 1, and the arc voltage may sharply decrease, making it impossible to interrupt.

Therefore, as shown in FIG. 25, the width of the slit 40 on the side of the rotation center 14 of the movable contact 1 is made smaller than the slit width on the side of the terminal portion 5 to prevent the heat flow and to provide a highly reliable breaking performance. Can be realized.

Example 18. FIG. 26 is a plan view of a main portion according to still another embodiment of the invention of claim 16. In this embodiment, contrary to the case of FIG.
The width of 0 is made larger on the side of the rotation center 14 of the movable contact 1 than on the side of the terminal portion 5. The narrower the width of the slit 40, the greater the effect that the arc touches the insulator 15 and is cooled. When the passing current increases and the arc cross section increases, the arc cross section can be limited by the width of the slit 40, and the arc voltage can be further increased.

Actually, since the movable contact 1 laterally shifts to the left and right during the opening / closing operation, it is difficult to set the width to be equal to or smaller than the slit width in consideration of the shift width.

Example 19 Therefore, as shown in FIG. 26, the left and right slit widths of the fixed contactor 4 are made larger than the above-mentioned deviation width, and further, the slit width on the terminal portion 5 side of the fixed contactor 4 is narrowed, so that a reliable opening / closing operation can be performed. The arc which is obtained and stretched in the direction of the terminal 5 is made into an insulator 15
It is possible to achieve high current limiting performance by limiting the arc cross section while cooling at. Further, as described above, if the width of the slit 40 is narrowed toward the inner side, the insulator 15 can be easily attached to the inner surface of the slit 40.

Example 20. FIG. 27 is a side view of a movable contactor according to an embodiment of the invention of claim 17. The movable contactor 1 includes a movable conductor 1a located closer to the rotation center 14 than the movable contact 2.
The part 1b is shaped so as to recede above the fixed surface of the movable contact 2.

Generally, the area of the arc spot increases and the arc cross section increases as the current increases during the breaking operation. At this time, as shown in FIG. 27, when the portion 1b of the movable conductor 1a is not retracted upward, only the movable contact 2 and the portion 1c of the movable conductor 1a on the terminal portion 5 side of the movable contact 2 expands the arc spot. Movable contact 2
Since the movable conductor 1a further spreads to the portion 1b of the movable conductor 1a on the side of the rotation center 14, the movable conductor 1a is melted and becomes thin, which lowers the mechanical strength and causes heat generation during energization after the breaking operation. Furthermore, in the worst case, a part of the movable conductor on the movable contact 2 side is dropped off, and re-entry becomes impossible. Moreover, since the movable conductor 1a is generally made of copper or a copper alloy and is more easily melted than the movable contact 2, the portion 1b of the movable conductor 1a is more likely to melt.
When the arc spreads, a large amount of metal vapor is generated from the movable contact 2 from the movable conductor portion 1b. Therefore, the insulation recovery in the vicinity of the portion 1b of the movable conductor 1a may be delayed immediately before the current is interrupted, and interruption may be impossible.

In order to solve such a problem, a method of covering the portion 1b of the movable conductor 1a with an insulator and a method of keeping the portion 1b of the movable conductor 1a away from the arc can be considered.

Example 20. 28 (a) is a plan view of a main part according to the embodiment of the invention of claim 18 and FIG. 28 (b) is a side view of FIG. 28 (a). By the way, as shown in FIG. 28A, when the insulator 21 is attached to the movable contactor 1, the width of the movable contactor 1 becomes large, so that the slit 40
It is necessary to widen the width as shown by the broken line in the figure. Along with this, the cross section of the left and right conductor portions of the slit 40 becomes smaller, and sufficient current carrying performance cannot be obtained.

For this reason, when it is difficult to use the method of covering the portion 1b of the movable conductor 1a with an insulator, the movable contactor for keeping the portion 1b of the movable conductor 1a away from the arc as shown in FIG. The shape of 1 is effective.

Further, when the fixed contactor 4 of FIG. 28 is used, the arc spot which spreads with the increase of the current is approximately the area of the movable contact 2 and the portion 1c of the movable conductor 1a closer to the terminal portion 5 than the movable contact 2. Therefore, the arc voltage can be increased.

When the portion 1b of the movable conductor 1a is further retracted upward, as shown in FIG. 28 (b), the distance d between the one end 42 of the slit 40 and the movable conductor 1a immediately after the arc is ignited. Can be made longer, and it is possible to prevent a decrease in arc voltage due to dielectric breakdown between the one end 42 of the slit 40 and the movable conductor 1a.

Example 22. 29 (a) is a side view of a movable contact according to another embodiment of the invention of claim 18 and FIG.
29B is a sectional view taken along the line BB of FIG. The movable contact 1 according to this embodiment has a structure in which the width of the movable conductor 1 a is narrower than the width of the movable contact 2. According to this embodiment, when the short-circuit current is interrupted, the movable contact 1
Is accelerated by a large electromagnetic force in the opening direction.

Generally, the movable contactor 1 accelerated at high speed collides with a stopper provided in a part of the container and stops. At this time, the movable contactor 1 receives a shocking force, so that the movable conductor 1a may be deformed if the mechanical strength is insufficient.

To increase the mechanical strength of the movable contact 1,
It suffices if the movable conductor 1a has a large cross section.
When the width of a is increased, the width of the slit 40 is increased and the current limiting performance is deteriorated.

Therefore, as shown in FIG. 29, the width of the movable conductor 1a in the left-right direction is made smaller than the width of the movable contact 2 in the left-right direction, and the width of the movable conductor 1a in the up-down direction and the cross-sectional area required for energization are sufficient. It is considered that the shape of the movable contactor 1 that secures sufficient mechanical strength is preferable.

Normally, the movable contact 2 is fixed by brazing, but the movable contact 2 can be prevented from falling off by forming the movable contact 1 as described above. Also,
As described above, the smaller the width of the slit 40, the greater the effect of the arc cooling by the vapor of the insulator of the slit 40 and the effect of restricting the arc cross section, and the higher the current limiting performance. However, the arc cooling effect is increased. As a result, a large amount of steam is generated, which may increase the pressure in the container and damage the container. Therefore, when there is a margin in the current-carrying capacities of the conductors on the left and right of the slit 40, it is considered that the width of the slit 40 is made relatively wide to reduce the generated pressure.

When the width of the slit 40 is widened, the current limiting performance is deteriorated. However, by disposing an insulator around the movable contact 2 to limit the arc cross section on the movable contact 1 side, the current limiting performance can be improved. Can compensate for the decline. As described above, when the insulator is attached around the movable contact 2, by using the movable conductor 1a which is narrower than the width of the fixed contact 2 as shown in FIG. 29, the increase in the width of the movable contact 1 can be suppressed to be relatively small. It becomes possible to attach an insulator.

In the embodiment of FIG. 3 described above, the movable contact 1
A slit 40 is provided substantially at the center, and the first conductor portion 4a and the third conductor portion 4d are arranged on the left and right. Like this, 2
The general characteristics of the magnetic field that creates the current flowing through the current paths when the two current paths are substantially parallel will be described below.

FIG. 30A is a simplified diagram for explaining the magnetic field characteristics created in the two current paths on the left and right of the rotating surface of the movable contactor. In FIG. 5A, the zx plane corresponds to the plane including the locus of the movable contact, the terminal portion is in the positive direction of the x axis, the center of rotation of the movable contact is in the negative direction of the x axis, and the movable contact is Is z
Left and right conductors 4 of the fixed contact located in the positive direction of the shaft.
The center lines of the current paths 3a and 43b are arranged in parallel on the xy plane at a distance of 2a.
b is symmetric with respect to the zx plane, currents I1 and I2 flowing through the left and right conductors thereof flow in the −x direction, and if the magnitudes are equal, the component in the positive direction of the y axis causes the arc to move toward the terminal portion side. It acts to stretch in the (positive direction of the x-axis). At this time, the line connecting the origin 0 and the −a point on the y axis and −a on the Y axis.
Letting θ be an angle formed by a line connecting the point P and an arbitrary point P0 on the z-axis, the change of the Y-direction magnetic field By at the point P0 is expressed by the following equation. By = (μI / 4πa) sin (2θ) However, the range of θ is −90 ° <θ <90 °, and μ is magnetic permeability and current I = I1 + I2.

FIG. 30 (b) is a graph showing the relationship between the angle θ and the y-direction magnetic field By from the above equation. Also, FIG.
0 (c) is shown in FIG. 30 (b) from the relationship of z = a · tan θ.
It is the figure which converted the horizontal axis of into the length on az axis. Figure 30
As can be seen from (c), the change rate of the y-direction magnetic field By with the increase of the value of z in the region of a <z is smaller than that of the region of z ≦ 0 ≦ a. For example, the value at which the y-direction magnetic field By reaches 80% of the peak value is a / 2 in the region of 0 ≦ z ≦ a and 2a in the region of a <z. When the above-mentioned positional relationship between the parallel conductors on the xy plane and the point P0 on the z-axis is applied to an actual embodiment, FIG.
become that way.

Example 23. 31 (a) is a side view of a fixed contact according to an embodiment of the invention of claims 19 and 20, and is a sectional view taken along the line CC of FIG. 31 (b). In this embodiment, the cross section along the line CC is the yz plane, P1 and P2 are the centers of gravity of the respective cross sections of the left and right first conductor portions 4a, and the point P0 is the center of the surface of the fixed contact 3. Where the angle θ is 45
In the case where the fixed contactor 4 is configured so that the angle is equal to or more than (° ≦ P0 (z)), the point Pmax at which the y-direction magnetic field By due to the current flowing through the conductors on the left and right of the slit 40 is maximum is the It is located on the upper z-axis, and the y-direction magnetic field By due to the current in the left and right conductors has a magnitude that does not change much from the peak value even on the surface of the fixed contact 3.

That is, the angle θ is 45 ° or more (a ≦ P
By configuring ≦ 0 (z), the arc stretching force in the space on the surface of the fixed contact and in the vicinity above the fixed contact can be increased, and the rise of the arc voltage can be improved.

However, if the angle θ is 45 ° or more (a ≦ P0
In the case of (z)), a large y-direction magnetic field By also acts on the current path of the second conductor section, and the conductor section forming the current path receives an electromagnetic force downward. Further, since the first conductor portion approaches the current path of the second conductor portion, it receives an electromagnetic force obliquely upward as a reaction of the electromagnetic force acting on the current path of the second conductor portion. Therefore, if the fixed contact cannot have sufficient strength due to restrictions such as external dimensions, material cost, and processing technology, the fixed contact may be deformed by the electromagnetic force.

Therefore, when the effect of the magnetic field extending the arc necessary for interrupting the current is obtained, the angles θ1 and θ2 are set to less than 45 ° (0 <0 (z) <a), The deformation can be prevented by adjusting the y-direction magnetic field applied to the current path.

In the embodiment of FIG. 1, since the slit 40 is also provided in the third conductor portion 4d, the conductor portions on the left and right sides of the slit of the third conductor portion 4d are connected to the conductor portions on the left and right sides of the slit of the first conductor portion 4a. Similar magnetic field characteristics are obtained.

FIG. 32 is a view of a part of a fixed contact according to another embodiment of the twentieth aspect of the invention as seen from above, showing a line connecting the center of gravity 42 of the conductor cross section on the left and right of the slit of the third conductor 4d. The z1 axis, which is the y axis and is rotated by 90 degrees about the y axis, passes through the center point P0 of the fixed contact 3 surface.
Determine the x1 y1 z1 coordinates. At this time, the relationship between the y-direction magnetic field By and z in FIG. 30C is also established in the y-direction magnetic field and z1 generated by the currents on the left and right sides of the slit of the third conductor portion 4d.

In FIG. 32, if the angle θ1 is 45 ° or more (a1 ≤ P0 (z)), the fixed contact point 3
The y-direction magnetic field By due to the current of the left and right conductors of the slit 40 is located on the conductor 4d side, and the y-direction magnetic field By due to the current of the left and right conductors does not change much from the peak value on the surface of the trowel 3. It will be Also, x1 y
3rd conductor part 4d in the y1 z1 plane of the 1 z1 coordinates in the x1 direction
The same relationship can be obtained by moving within the length range of.

For this reason, when the angle θ1 is set to 45 ° or more (a ≦ P0 (z)), the arc stretching force in the space on the surface of the fixed contact 3 and in the vicinity above the fixed contact 3 can be increased. The rise of voltage can be improved. Furthermore, since the peak of the y-direction magnetic field strength By is located closer to the center of rotation of the movable contact than the fixed contact 3, the arc is less likely to spread to the mechanical section side, and the heat flow to the mechanical section side can be reduced. In addition, when an arc runner is provided on the terminal portion 5 side from the fixed contact 3 (from the fixed contact 3 to the terminal portion 5
When the conductor of the second conductor portion 4e extends to the side, the part of the second conductor portion on the terminal portion side of the fixed contact is regarded as an arc runner), and the arc spot is from the fixed contact 3 to the arc runner on the terminal portion 5 side. However, since the y-direction magnetic field By does not decrease so much even when the arc spot moves to the arc runner, quick arc driving is possible, and
The arc is effectively stretched at the tip of the arc runner. As described above, the wear of the fixed contact can be reduced by transferring the arc to the arc runner and extending the arc.

However, paying attention to the breaking performance in the presence of the arc runner, the angle θ is less than 45 ° (0
There are cases where it is preferable to satisfy <P0 (z) <a1). The arc just before interrupting the normal current is located at the tip of the arc runner, and how to extend the arc at that position by electromagnetic force has an important effect on the interrupting performance.

In particular, when the circuit voltage is relatively high and the current value for interruption is relatively small, it is necessary to extend the arc by electromagnetic force immediately before interruption. Therefore, the angle θ
1 is less than 45 ° (0 <P0 (z) <a1), and the y-direction magnetic field By created by the current in the conductors on the left and right of the slit 40 of the third conductor 4d near the tip of the arc runner is maximized. By doing so, the breaking performance can be improved even under the breaking conditions.

Example 24. FIG. 33 is a perspective view showing a fixed contact according to still another embodiment of the present invention.
In this embodiment, the first conductor portion 4a and the third conductor portion 4d
The slit 40 is provided in the above, and is arranged above the connection portion between the second conductor portion 4e and the third conductor portion 4d. By doing so, it becomes possible to lengthen the third conductor portion 4d as in the embodiment of FIGS. 20 and 21, and the force of pushing the arc toward the terminal portion 5 side becomes large.

FIG. 34 (a) is a side view of the fixed contact of FIG. 33, FIG. 34 (b) is a sectional view taken along the line C1-C1 of FIG. 34 (a), and FIG. 34 (c) is of FIG. 34 (a). It is a C2-C2 sectional view taken on the line. In the fixed contactor 4 of this embodiment, the y-direction magnetic field component on the surface of the fixed contact 3 is further increased by arranging the center point P0 of the surface of the fixed contact 3 so that the angles θ and θ1 are approximately 45 °. It becomes possible.

Example 25. FIG. 35 (a) is a perspective view of a fixed contact according to another embodiment of the present invention, and FIG. 35 (b) is a perspective view of the fixed contact of FIG. 35 (a) in an insulated state. In the fixed contactor 4 of FIG. 3, the slit 40 is provided across the first conductor portion 4a and the third conductor portion 4d, but the fixed contactor 4 of this Example 25 has a slit in the third conductor portion 4d. The shape configuration is such that 40 is hardly provided. As described above, by eliminating the slit 40 of the third conductor portion 4d, it is possible to prevent the heat flow toward the rotation center 14 side of the movable contactor 1 and to increase the arc extending action by the current of the third conductor portion 4d. be able to.

Example 26. FIG. 36 is a perspective view of a fixed contact according to another embodiment of the present invention. The fixed contactor 4 according to this embodiment has a shape configuration in which a slit 40 is provided in a part of the first conductor portion 4a, the third conductor portion 4d, and the second conductor portion 4e. Providing such slits 40 facilitates bending of the fixed contactor 4.

Example 27. FIG. 37 is a perspective view of a fixed contact according to still another embodiment of the present invention. The fixed contactor 4 according to this embodiment includes a third conductor portion 4d of the first conductor portion 4a.
The side is formed obliquely. Then, the first conductor portion 4a, the third conductor portion 4d, and the second conductor portion 4e.
A slit 40 is provided in a part of the same as in the case of FIG. Therefore, even in the 27th embodiment,
The same effect as in the case of 6 can be obtained.

Example 28. FIG. 38 is a perspective view of a fixed contact according to another embodiment of the present invention. In this embodiment, the height of the insulator 15a that covers the inner part of the slit 40 of the fixed contact 1 is made high. According to this structure, the area of the insulator on which the arc extended to the terminal portion 5 side is pressed is increased, the effect of cooling the arc is increased, and the arc voltage is increased, so that the current limiting performance is improved. . Further, it is possible to prevent the hot gas drawn from the exhaust hole to the terminal portion 5 side from touching the terminal portion 5, and it is possible to prevent the arc voltage between the movable contact 1 and the terminal portion 5 from lowering due to arcing. .

Although the circuit breaker has been described in the above embodiments, other switches may be used, and the same effect as that of the above embodiments can be obtained.

[0150]

As described above, according to the first aspect of the invention, immediately after the contact is opened, all the current paths of the fixed contact generate an electromagnetic force that extends the arc toward the terminal portion, and the arc is suddenly increased. The voltage can be raised, and even if the separation distance of the movable contact is increased, the arc cooling function of the insulator of the slit can generate and maintain a high arc voltage. There is an effect that a switch with high performance can be obtained.

According to the second aspect of the present invention, since the fixed contact is substantially U-shaped, the fixed contact can be easily molded. Further, by providing a slit in the conductor portion of the fixed contact located above the fixing surface of the fixed contact to allow the opening / closing operation of the movable contact, the opening / closing operation of the movable contact is performed by the fixed contact. The effect is that there is no fear of being hindered.

According to the third aspect of the present invention, the first conductor portion is arranged on either the left or right of the plane of the locus drawn by the movable contact during the opening / closing operation. Therefore, the current limiting performance is excellent and a large current is cut off. This is effective in obtaining a switch that is less likely to be damaged by the pressure generated in the container.

According to the invention of claim 4, since the terminal portion is arranged flush with or above the first conductor portion, the arc can be extended immediately after the contact is opened by the electric current flowing through the terminal portion, and the current limiting performance is improved. Has the effect of further improving. Further, when the terminal portion is arranged above the first conductor portion, there is an effect that the circuit breaking performance of a relatively high voltage is improved. Furthermore, since the terminal portion or a part of the terminal portion is arranged below the first conductor portion, a high arc voltage can be maintained, and there is an effect of suppressing the passing energy at the time of interruption of the short-circuit current to be small. Further, by arranging the terminal portion below the first conductor portion and above the fixed contact contact surface, the arc in the vicinity of the iron surface can be extended by the current of the terminal portion, which has the effect of improving the current limiting performance. .

According to the invention of claim 5, since the terminal plate portion is arranged below the fixed contact, the effect of catching the arc in the vicinity of the terminal portion is increased, so that the action of maintaining the arc voltage is increased. However, it has the effect of reducing the passing energy during the interruption operation.

According to the sixth aspect of the invention, since the first conductor portion is provided with the convex obtuse bent portion on the side opposite to the fixed contact so that the terminal portion is located below the first conductor portion, There is an effect that the rising of the arc voltage in the very initial stage can be accelerated, a high arc voltage can be maintained, the current performance can be further improved, and the bending process of the fixed contact can be facilitated.

According to the seventh aspect of the present invention, the second conductor portion is provided with a portion substantially parallel to the movable contact at the time of closing at a portion opposite to the terminal portion from the position of the fixed contact. The rise of the contact opening speed of the movable contact due to the electromagnetic force is increased, and the current limiting performance is further improved.

According to the invention of claims 8 to 10, the first conductor portion is provided with an obtuse angle and a convex bent portion on the opposite side of the fixed contact, or the first conductor portion and the third conductor portion are obtusely bent. The magnetic field component for extending the arc on the surface of the fixed contact can be increased by making it continuous through the part or by configuring the third conductor part with a convex curve on the side opposite to the terminal part,
Further, there is an effect that the current limiting performance is improved. Further, since the third conductor portion is formed of a curved line that is convex on the side opposite to the terminal portion, it is possible to easily process a fixed contactor in a switch having a large current carrying capacity.

According to the eleventh aspect of the present invention, since the convex contact portion is provided on the fixed contact side of the first conductor portion and the apex of this protrusion portion is arranged closer to the terminal portion side than the fixed contact, the arc voltage rises. It is possible to improve the current limiting voltage, maintain a high arc voltage, and improve the current limiting performance.

According to the twelfth aspect of the invention, since the contact surface of the fixed contact is arranged so as to face the terminal portion side with respect to the vertical line in the vertical direction, a high arc is achieved even in a large current region in which the force ejected from the arc contact is large. The voltage can be maintained, and the passing energy at the time of short circuit interruption can be reduced.

According to the thirteenth aspect of the invention, the conductor portion to which the fixed contact of the second conductor portion is fixed is located above the end portion of the second conductor portion which is continuous with the third conductor portion. As a result, the arc extending action due to the current in the third conductor portion is increased, and pressure reflection from the container to the arc extruded to the terminal portion side can be prevented, so that the arc is more easily extended and the current limiting performance is improved. Has the effect of improving. Further, since the inflow of heat flow into the mechanism section can be reduced, there is an effect that the reliability of the opening / closing operation is improved.

According to the fourteenth aspect, by making the first conductor portion and the third conductor portion continuous through the bent portion having an acute angle, an electromagnetic force for promoting the contact opening applied to the movable contact is applied until the latter half of the contact opening operation. Since it can be given to the movable contact,
This has the effect of improving the breaking performance in a circuit with a relatively high power supply voltage.

According to the fifteenth aspect, the center line of the second conductor portion is positioned on the plane including the locus drawn by the movable contact, and the one end portion of the third conductor portion of the second conductor portion is further positioned. Since the width of the other end side where the fixed contact is fixed is made smaller than the width to concentrate the current on the center line, the magnetic field component that extends the arc and opens the movable contact increases. Since the size of the arc spot can be limited, the current limiting performance is further improved.

According to the sixteenth aspect, there is provided a slit for not obstructing the opening / closing operation of the movable contact, and
Since the width of the slit on the side opposite to the terminal portion is smaller than the width on the terminal portion side, the first conductor portion having a substantially left-right symmetry is provided, so that the heat flow to the mechanism portion can be reduced, and the slit is re-injected after the operation. There is an effect that it is possible to obtain a switch having a highly reliable opening / closing operation, which can be prevented from becoming impossible. On the other hand, if the width of the slit on the side of the terminal portion is smaller than the width on the side opposite to the terminal portion, the cooling effect by the insulator can be enhanced,
This has the effect of further improving current limiting performance.

According to the seventeenth aspect, the portion of the movable conductor on the other end side where the movable contact of the movable conductor is not fixed to the movable contact and immediately next to the movable contact is retracted from the fixed surface of the movable contact. Therefore, it is effective in preventing melting of the movable contactor and preventing inability to cut off due to delay in insulation recovery.

According to the eighteenth aspect of the present invention, since the width of the movable conductor forming a part of the movable contact in the left-right direction is smaller than the width of the movable contact, the movable contact can be prevented from falling off and the movable contact can be prevented. The mechanical strength of the child in the vertical direction is increased, and deformation of the movable contactor is prevented.

According to the nineteenth and twentieth aspects of the invention, there is provided the first conductor portion having the slit along the surface including the locus drawn by the movable contact so as not to hinder the opening / closing operation of the movable contact. Including the center point P0 of the fixed contact surface, and
In a cross section perpendicular to the plane including the locus and the current path of the first conductor portion, a line connecting the centroids P1 and P2 of the cross sections of the first conductor portions on the left and right of the slit, the center point P0, and the centroid P1. Since the angles θ1 and θ2 on the surface side including the locus formed by the lines connecting the centers of gravity P2 are arranged to be 45 ° or more, the force for extending the arc in the space on the fixed contact surface and in the vicinity above the fixed contact surface is increased, Since the rise of the arc voltage can be improved, it has the effect of further improving the current limiting performance. On the other hand, if the angles θ1 and θ2 are less than 45 °, the electromagnetic force applied to each part of the fixed contact can be reduced, so that the deformation of the fixed contact can be prevented when sufficient mechanical strength cannot be obtained.

According to the twenty-first aspect of the invention, the third conductor portion having the slit along the surface including the locus drawn by the movable contact is provided so as not to hinder the opening / closing operation of the movable contact, and the locus is included. In a plane S0 and a cross section S0 perpendicular to the current path of the third conductor, the line connecting the centers of gravity P1 and P2 of the cross sections of the third conductors on the left and right of the slit and the center point P0 of the fixed contact surface are extended upward. Since the angle θ1 and θ2 on the surface side including the locus formed by the line connecting the center of gravity P1 and the center of gravity P2 with the point PO ₁ where the perpendicular intersects the cross section S0 and the center of gravity P1 and the center of gravity P2 are 45 ° or more, Also, since the force of extending the arc in the space near and above it can be increased and the rise of the arc voltage can be improved, there is an effect of further improving the current limiting performance. On the other hand, if the angles θ1 and θ2 are set to less than 45 °, the magnetic field component that extends the arc spot on the fixed contact side just before breaking and the arc in the space above the fixed contact moved to the terminal side from the fixed contact is maximized. It has the effect of improving the blocking performance.

[Brief description of drawings]

FIG. 1 is a side view of an arc extinguishing section showing a closed state of a circuit breaker according to an embodiment of the present invention.

FIG. 2 is a side view showing an open state of the circuit breaker of FIG.

3 (a) is a perspective view showing the fixed contact of FIG. 1. FIG. FIG. 3B is a perspective view showing a state in which the fixed contactor of FIG. 3A is insulated.

FIG. 4 is an operation explanatory view showing a state after the contact circuit of the circuit breaker of FIG. 1 has been eaten.

5 (a) is an explanatory diagram of a magnetic field strength distribution generated by a current flowing through the fixed contact of FIG. FIG. 5B is a sectional view taken along the line AA of FIG. FIG. 5C shows FIG.
It is a graph which shows the magnetic field strength distribution which the electric current which flows through a fixed contact makes on the Z-axis of (b).

FIG. 6 is an operation explanatory view showing the maximum open state of the movable contactor of the circuit breaker of FIG. 1.

FIG. 7 (a) is a perspective view of a fixed contact according to another embodiment of claim 1. FIG. FIG. 7B is a perspective view showing a state in which the fixed contact of FIG. 7A is insulated.

8 (a) is a side view of a main portion showing a state immediately after contact opening of a circuit breaker adopting the fixed contact of FIG. 7 (b). FIG. 8B is a side view of the main part showing the contact maximum open state of FIG.

FIG. 9 is a side view of a main part according to an embodiment of the invention of claim 4;

FIG. 10 is a side view of a main part according to another embodiment of the invention of claim 4;

11 is another embodiment of the invention of claim 4 and claim 5;
FIG. 3 is a side view of the main part according to an embodiment of the invention of FIG.

FIG. 12 is a side view of a main part according to an embodiment of the invention of claim 6;

FIG. 13 is a side view of a main part according to another embodiment of the invention of claim 6;

FIG. 14 is a side view of a main part according to an embodiment of the invention of claim 7;

FIG. 15 is a side view of a main part according to an embodiment of the invention of claim 8;

FIG. 16 is a side view of a main part according to an embodiment of the invention of claim 9;

FIG. 17 is a side view of a main part according to an embodiment of the invention of claim 10;

FIG. 18 (a) is a side view of a main portion showing a state immediately after contact opening according to an embodiment of the invention of claim 11; FIG. 18B is a side view of the main part showing the contact maximum open state of FIG.

FIG. 19 is a side view of a main part according to an embodiment of the invention of claim 12;

FIG. 20 is a side view of a main part according to an embodiment of the invention of claim 13;

FIG. 21 is a side view of a main part according to an embodiment of the invention of claim 14;

FIG. 22 is a side view of a main part according to an embodiment of the invention of claim 15;

23 is a view of the second conductor portion of FIG. 22 as seen from above.

FIG. 24 (a) is a view of a movable contact and a fixed contact according to an embodiment of the invention of claim 16 as seen from above. FIG. 24 (b) is a side view of FIG. 24 (b).

FIG. 25 is a view of a movable contact and a fixed contact according to another embodiment of the invention of claim 16 as seen from above.

FIG. 26 is a view of a movable contactor and a fixed contactor according to still another embodiment of the sixteenth invention as viewed from above.

FIG. 27 is a side view of a movable contactor according to an embodiment of the invention of claim 17;

FIG. 28 (a) is a plan view of a main part according to an embodiment of the invention of claim 18; 28 (b) is shown in FIG.
It is a side view of (a).

FIG. 29 (a) is a side view of a movable contactor according to another embodiment of the invention of claim 18; 29B is a sectional view taken along the line BB of FIG.

FIG. 30 (a) is an explanatory diagram of general magnetic field characteristics on a plane of symmetry of a parallel current. 30 (b) is shown in FIG.
FIG. 7 is a graph showing the relationship between the angle θ and the y-direction magnetic field By in (c). FIG. 30C is a graph diagram in which the horizontal axis of FIG. 30B is converted to the length on the z axis from the relationship of z = a · tan θ.

FIG. 31 (a) shows claims 19 and 20.
FIG. 6 is a side view of a fixed contact according to an embodiment of the invention. 31B is a cross-sectional view taken along the line CC of FIG.

FIG. 32 is a diagram showing a part of a fixed contact according to an embodiment of the invention of claim 21 as seen from above.

FIG. 33 is a perspective view of a fixed contact according to another embodiment of the present invention.

34 (a) is a side view of the fixed contact shown in FIG. 33. FIG. 34B is a cross-sectional view taken along the line C1-C1 of FIG. FIG. 34C shows C2-C2 of FIG.
It is a line sectional view.

FIG. 35 (a) is a perspective view of a fixed contact according to still another embodiment of the present invention. 35 (b) is shown in FIG.
It is a perspective view showing the state where the fixed contact child of (a) was insulated.

FIG. 36 is a perspective view of a fixed contact according to still another embodiment of the present invention.

FIG. 37 is a perspective view showing a modified example of the fixed contactor of FIG. 36.

FIG. 38 is a perspective view of a fixed contact according to still another embodiment of the present invention.

FIG. 39 is a side view showing an open state of a conventional circuit breaker.

40 is a side view showing a state immediately after contact opening of the circuit breaker of FIG. 39. FIG.

41 is a side view showing the maximum open state of the movable contactor in the circuit breaker of FIG. 40. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 movable contactor 2 movable contact point 3 fixed contact point 4 fixed contactor 4a first conductor portion 4d third conductor portion 4e second conductor portion 5 terminal portion 15 insulator

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Kenichi Nishina Kenichi Nishina 1-8 Midoricho, Fukuyama City Mitsubishi Electric Co., Ltd. Fukuyama Factory (72) Inventor Shinichi Yamaguchi 1-8 Midoricho, Fukuyama City Fukuyama Works Mitsubishi Electric Corporation Within

Claims (21)

[Claims] 1. A movable contact having a movable contact at one end, a fixed contact having at one end a fixed contact that can be brought into contact with and separated from the movable contact by opening and closing the movable contact, and a fixed contact of the fixed contact. In a switch having a terminal part connected to the other end, when the direction in which the movable contact in the contact closed state separates from the fixed contact is upward, the fixed contact is connected to the terminal part. A first conductor portion, a second conductor portion having the fixed contact, and a third conductor portion that vertically connects the first conductor portion and the second conductor portion, and the third conductor portion is located at the fixed contact position. The movable contact of the movable contactor is disposed on the other end side where the movable contact is not provided and on the opposite side of the terminal portion, and the first conductor portion is disposed above the contact contact surface when the contact is closed. The contact is arranged below the contact surface of the movable contact when the contact is opened, A switch which is characterized in that a portion of the first conductor portion that can be seen from the surface of the movable contact at the time of opening is covered with an insulator. 2. The fixed contact has a substantially U-shaped connecting conductor portion, a fixed contact is fixed to the inside of one end of the U-shape, and the other end of the U-shape is formed. A terminal portion is connected to the fixed contact, and a slit for allowing the opening / closing operation of the movable contact with respect to the fixed contact is provided at a portion of the connection conductor located above the fixing surface of the fixed contact. The switch according to claim 1, wherein the switch is provided. 3. The fixed contact is characterized in that a first conductor portion located above the fixed contact is formed on one of left and right of a plane of a locus drawn by the movable contact by an opening / closing operation. The switch according to claim 1. 4. The terminal portion connected to the fixed contact is formed so as to be flush with the first conductor portion or above the first conductor portion or below the first conductor portion. The switch according to claim 1, wherein the terminal portion located below the first conductor portion is located above a contact contact surface when the contact is closed. 5. The terminal portion includes a lead portion connected to the first conductor portion of the fixed contact and a terminal plate portion connected to an external electric circuit, and the terminal plate portion is in a contact closed state. The switch according to claim 1, wherein the switch is arranged below a contact surface of the contact. 6. The fixed contact has a first conductor portion connecting the terminal portion and the fixed contact with a bent portion having an obtuse angle and a side opposite to the fixed contact. The switch according to claim 1, wherein a portion of the bent portion opposite to the terminal portion is substantially parallel to the second conductor portion having the fixed contact. 7. The fixed contact is a portion of a connection conductor that connects the terminal portion and the fixed contact, which is immediately connected to the fixed contact, and is movable from the position of the fixed contact to the side opposite to the terminal portion when closed. The switch according to claim 1, wherein the switch has a portion substantially parallel to the contact. 8. The fixed contact has a first conductor portion connecting the terminal portion and the fixed contact with a bent portion having an obtuse angle and opposite to the fixed contact. 2. The switch according to claim 1, wherein a portion closer to the terminal portion than the bent portion is made substantially parallel to the second conductor portion to which the fixed contact is fixed. 9. The fixed contact is such that the first conductor portion and the third conductor portion are continuous with each other through an obtuse-angled bent portion, and the third conductor portion and the second conductor portion are continuous with each other through an acute-angled bent portion. The switch according to claim 1, wherein the obtuse angle and the acute angle are arranged so as to be convex on the side opposite to the fixed contact. 10. The switch according to claim 1, wherein in the fixed contactor, the third conductor portion is formed as a convex curve on the side opposite to the terminal portion. 11. The fixed contact is characterized in that a protrusion protruding toward the fixed contact is provided on the first conductor portion, and the apex of the protrusion is located closer to the terminal than the fixed contact. The switch according to claim 1. 12. The fixed contact has one end portion, where the fixed contact of the second conductor portion is provided, located below the other end portion such that the contact surface of the fixed contact faces the terminal portion side from a vertical line in the vertical direction. The switch according to claim 1, wherein the switch has a shape that is positioned. 13. The fixed contact is formed such that a conductor portion to which a fixed contact of the second conductor portion is fixed is located above an end portion of the second conductor portion which is continuous with the third conductor portion. The switch according to claim 1, wherein the switch is provided. 14. The fixed contact includes a first conductor portion and a third conductor portion.
The conductor portion is continuous through a bent portion with an acute angle, the third conductor portion and the second conductor portion are continuous through a bent portion with an obtuse angle, and the obtuse angle and the acute angle are convex to the side opposite to the fixed contact. The switch according to claim 1, wherein the switch is formed as follows. 15. The fixed contact is such that the center line of the second conductor is located on a plane including the locus drawn by the movable contact by the opening / closing operation, and the third conductor of the second conductor is closer to the center. 2. The switch according to claim 1, wherein the width of the other end side to which the fixed contact is fixed is smaller than the width of one end of the switch. 16. The fixed contact includes a first conductor portion having a slit along a surface including a locus drawn by the movable contact so as not to hinder the opening / closing operation of the movable contact.
The conductor part is formed substantially symmetrical with respect to the plane including the locus, and the left and right conductor parts of the slit are formed substantially parallel to each other, or the width of the slit on the side opposite to the terminal part is equal to that of the terminal part side. 2. The switch according to claim 1, wherein the switch is formed to be smaller than the width, or the width of the slit on the terminal portion side is smaller than the width of the terminal portion and the side opposite to the terminal portion. 17. The movable contact is such that the movable conductor portion on the other end side where the movable contact is not fixed, and right next to the movable contact is set back from the fixed surface of the movable contact. The switch according to claim 1, wherein: 18. When the direction perpendicular to the plane containing the locus of the movable contact drawn by the opening and closing operation is the left-right direction, the width of the movable conductor forming a part of the movable contact in the left-right direction is the width of the movable contact. The switch according to claim 1, wherein the switch is made smaller. 19. The fixed contact includes a first conductor portion having a slit along a surface including a locus drawn by the movable contact in an opening / closing operation, and includes a center point P0 of a fixed contact surface,
In addition, in a cross section perpendicular to the plane including the locus and the current path of the first conductor portion, a line connecting the centers of gravity P1 and P2 of the cross sections of the first conductor portions on the left and right of the slit, and the center point P0.
2. The switch according to claim 1, wherein the switches are arranged so that the angles θ1 and θ2 on the surface side including the locus formed by the lines connecting the center of gravity P1 and the center of gravity P2 are 45 ° or more. 20. The fixed contact includes a first conductor portion having a slit along a surface including a locus drawn by the movable contact in an opening / closing operation, and includes a center point P0 of a fixed contact surface,
In addition, in the plane including the locus and the cross section perpendicular to the current path of the first conductor portion, the side of the plane including the locus formed by the lines connecting the centroids P1 and P2 of the cross sections of the first conductor portions on the left and right sides of the slit, respectively. The switch according to claim 1, wherein the switches are arranged such that the angles θ1 and θ2 are less than 45 °. 21. The fixed contact includes a third conductor portion having a slit along a surface including a locus drawn by the movable contact during opening and closing operations, and a current including the surface including the locus and the current of the third conductor portion. In a cross section perpendicular to the path, a line connecting the centers of gravity P1 and P2 of the cross sections of the respective third conductors on the left and right of the slit and a point PO ₁ where a perpendicular line extending upward from the center point P0 of the fixed contact surface intersects with the cross section And the angle θ1 on the plane side including the locus formed by the lines connecting the center of gravity P1 and the center of gravity P2.
2. The switch according to claim 1, wherein the switch is arranged such that the angle θ2 is 45 ° or more or less than 45 °.