JPH07272596A - Switch and its arc elimination capability control device - Google Patents

Abstract

PURPOSE:To obtain a switch in which any arc is not eliminated at an insufficient distance between contacts by providing a conductor bar supported on an insulating support body on the same axis as that of a movable contact and oppositely facing the opening part of a fixed contact. CONSTITUTION:A switch for opening/closing a contact part in the insulation arc elimination gas has its structure below. Namely, a fixed contact 1, a movable contact 2 removably supported on the fixed contact 1, and a field disturbing conductor 9 insulated and supported (10: support body) so that its acute tip end is interposed in a specific position between the fixed contact 1 and the movable contact 2 until their relative open distance reaches the specific value during opening operation of the fixed contact 1 and the removable contact 2 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch for an electric circuit, and more particularly to a switch for extinguishing an arc by blowing an insulating arc extinguishing gas compressed by a puffer chamber to the arc and a control device for extinguishing the arc.

[0002]

2. Description of the Related Art FIG. 20 is a cross-sectional view showing a main part inside a conventional gas blow type switch shown in, for example, Japanese Utility Model Laid-Open No. 4-58928. In the figure, it is the fixed contactor 1 and the piston 4 that are fixed to the casing (not shown) of the switch, and the other parts are axially (left and right in the figure) relative to them. Move. The state shown in the figure is the fixed contact 1.
And the movable contactor 2 are completely separated. The movable contactor 2 moves to the left in the drawing and is externally inserted into the fixed contactor 1 to form an electrical connection, and is connected to an operation rod 6 driven by a drive mechanism (not shown). The operating rod 6 is integrally connected to the cylinder 3. The piston 4 is provided and fixed in the cylinder 3. The puffer chamber 5 is a space surrounded by the cylinder 3 and the piston 4. The insulating nozzle 7 made of an insulating material is fixed to the cylinder 3 and has a substantially cylindrical shape surrounding the movable contact 2. All the illustrated parts except the insulating nozzle 7 are made of metal, for example, copper or copper alloy.

Next, the operation of the above conventional example will be described. FIG. 21 is a cross-sectional view showing a state in which the switch is in the opening / closing operation. When the operating rod 6 is pulled to the right in the figure from the state where the switch is in the closed state, that is, the state where the fixed contact 1 and the movable contact 2 are joined, the fixed contact 1 and the movable contact 2 are separated, In the meantime, the arc A is generated. Since the cylinder 3 moves together with the movable contact 2, the insulating arc-extinguishing gas in the puffer chamber 5 is compressed by the cylinder 3 and the piston 4. The compressed gas is guided toward the arc A along the internal shape of the insulating nozzle 7 and blown onto the arc A. As a result, the arc A is cooled and extinguished.

[0004]

In the conventional switch constructed as described above, as shown in FIG. 21, the insulation distance between the fixed contact 1 and the movable contact 2 during the opening / closing operation is reduced. Even if it is still insufficient, the insulating arc-extinguishing gas is blown onto the arc A, so that the arc is extinguished. However, when the arc is extinguished with the insulation distance thus insufficient, there is a possibility of re-ignition. As a result, the conventional switch may generate a surge voltage due to re-ignition.

The present invention has been made to solve the above problems, and an object thereof is to provide a switch which does not extinguish an arc while the insulation distance between the contacts is insufficient. Another object of the present invention is to provide a device capable of controlling the extinguishing ability so that the extinguishing time is appropriate.

[0006]

A switch according to the present invention is a switch for opening and closing a contact portion in an insulating arc-extinguishing gas, wherein the fixed contact and the fixed contact can be separated from each other. The movable contactor supported by the fixed contactor and the movable contactor at a predetermined position during the separating operation of the fixed contactor and the movable contactor until the relative separation distance thereof reaches a predetermined value. And a conductor for electric field disturbance that is insulated and supported so that its sharp end is interposed.

Further, in a switch for opening and closing a contact portion in an insulating arc-extinguishing gas, a fixed contact having an opening at an end face is disposed so as to face the end face, and is brought into contact with and separated from the fixed contact. A movable contact that is freely supported and is insulated and fixed relative to the movable contact so as to face the opening, and a tip portion projects from the end of the movable contact toward the fixed contact. A conductor rod, an insulating nozzle that encloses the movable contact and the conductor rod, and has an insulating nozzle that guides an insulating arc-extinguishing gas to the vicinity of the end of the movable contact. is there.

Further, the switch according to the present invention is a switch for opening and closing a contact portion in an insulating arc-extinguishing gas, wherein a fixed contact having an opening at an end face is opposed to the fixed end. A movable contact having a substantially cylindrical shape, which is disposed so as to be capable of coming into contact with and separated from the fixed contact, and provided at the central axis position of the movable contact so as to face the opening, and the tip portion of the movable contact. A conductor rod protruding from the end of the child toward the fixed contact, a tubular member connected to the movable contact, the operating rod having a vent hole in the tubular wall surface, and the operating rod of the operating rod. A perforated insulating member supported by an inner wall, comprising a support for supporting the conductor rod, a substantially cylindrical insulator surrounding the movable contactor and the conductor rod, and an insulating arc extinguishing gas And an insulating nozzle that guides the movable contact to the vicinity of the end.

Further, in a switch which opens and closes a contact portion in an insulating arc-extinguishing gas, a fixed contact having an opening at an end face is disposed so as to face the end face, and is brought into contact with and separated from the fixed contact. The movable contact is freely supported, and the movable contact is insulated and supported so as to be relatively slidable with respect to the movable contact so as to face the opening, and the fixed contact is made from the end of the movable contact. It is provided with a conductor rod protruding toward the child side and a drive device for driving the conductor rod relatively to the movable contact.

Further, a conductor rod is provided coaxially with the movable contactor so as to face the opening, and a tip portion of the conductor rod protrudes from the end portion of the movable contactor toward the fixed contactor, and is fixed to the conductor rod. A support body that insulates and supports the conductor rod slidably with respect to the movable contact, a drive device that relatively drives the conductor rod with respect to the movable contact, and a drive device that drives the conductor rod. An elastic member that connects to the device and an elastic body,
And a locking member that locks the support body up to a predetermined elastic deformation.

Further, a conductor rod is provided coaxially with the movable contactor so as to face the opening, and a tip end of the conductor bar protrudes from the end of the movable contactor toward the fixed contactor. A support body that is relatively fixed to the movable contactor and that slidably supports the conductor rod relative to the movable contactor; and a drive device that drives the conductor rod relative to the movable contactor. An elastic member that connects the conductor bar to the drive unit, a locking piece that is made of an insulating material and is fixed to the conductor bar, and an elastic body that locks the locking piece until a predetermined elastic deformation is reached. And a locking member for locking.

Further, a sharp finishing portion is provided on the outer peripheral surface of at least one of the fixed contact and the movable contact.

Further, in a switch that opens and closes the contact portion in an insulating arc-extinguishing gas, a fixed contact having a portion that suddenly protrudes or is depressed from the outer peripheral surface of the switch, and is disposed so as to face the fixed contact. A movable contactor that is supported so as to be able to come into contact with and separate from the fixed contactor and a substantially cylindrical insulator that surrounds the movable contactor. And an insulating nozzle for guiding.

Further, in a switch that opens and closes the contact portion in an insulating arc-extinguishing gas, an annular continuous projection portion including a sharp finishing portion is provided over the entire circumference of the outer peripheral surface thereof at a predetermined axial position. A fixed contact having, a movable contact that is disposed so as to face the fixed contact and is supported so as to be freely contactable with and separated from the fixed contact, and a substantially cylindrical insulator that surrounds the movable contact, An insulating nozzle for guiding the insulating arc-extinguishing gas to the vicinity of the end of the movable contact.

Further, the arc-extinguishing ability control device according to the present invention has a sharp end at a predetermined position between the contacts until the relative opening distance between the contacts during the opening operation reaches a predetermined value. This is provided with an electric field disturbance conductor that is insulated and supported so that the parts are interposed.

An electric field is insulated and supported between the contacts during the separating operation so that their sharp ends are interposed at predetermined positions between the contacts until their relative separation distance reaches a predetermined value. It is provided with a disturbance conductor and a drive device for driving the electric field disturbance conductor asynchronously with the opening operation.

Further, an electric field insulated and supported between the contacts during the separating operation so that their sharp ends are interposed at predetermined positions between the contacts until the relative separation distance reaches a predetermined value. A conductor for disturbance, a drive device for driving the conductor for electric field disturbance, an elastic member for connecting the conductor for electric field disturbance to the drive device, and an elastic body. The conductor for electric field disturbance until a predetermined elastic deformation. And a locking device for locking.

[0018]

In the switch configured as described above, the electric field disturbance conductor disturbs the electric field between the contacts during the opening operation and prevents arc extinction while the distance between the contacts is insufficient. .

Further, the conductor rod provided on the movable contact side disturbs the electric field between the contacts during the opening operation, and prevents arc extinction while the distance between the contacts is insufficient.

The operating rod having the ventilation hole and the support member, which is a perforated insulating member, provide a passage for guiding the insulating arc-extinguishing gas to the tip of the movable contact.

Further, the conductor rod provided on the movable contact side disturbs the electric field between the contacts during the opening operation and prevents arc extinction as long as the distance between the contacts is insufficient, and the drive unit conducts the conductor. The rod is driven relative to the movable contact.

The elastic member temporarily stores the driving force of the driving device to some extent and then transmits the driving force to the conductor rod. The locking member helps the elastic member to store energy and regulates the timing of release.

Further, the conductor rod slides in the support to prevent the conductor rod from vibrating.

Further, in the switch according to the present invention,
The sharp finishing part provided on the outer peripheral surface of the contact disturbs the electric field between the contacts and prevents arc extinction while the distance between the contacts is insufficient.

A portion of the fixed contact which is projected or recessed sharply from the outer peripheral surface disturbs the electric field between the contacts and prevents arc extinction while the distance between the contacts is insufficient.

Further, the annular protrusion provided on the outer peripheral surface of the fixed contact disturbs the electric field between the contacts and prevents the arc from being extinguished while the distance between the contacts is insufficient. Temporarily disturb the gas blowout.

Further, the electric field disturbance conductor in the arc extinguishing capability control device disturbs the electric field between the contacts during the opening operation, and prevents arc extinction while the distance between the contacts is insufficient.

The driving device drives the electric field disturbance conductor asynchronously with the opening operation.

Also, the locking device helps the elastic member to store energy,
And the timing of the release is regulated.

[0030]

【Example】

[Embodiment 1] FIGS. 1 to 4 are sectional views showing a main part inside a gas blow type switch which is Embodiment 1 of the present invention. Figure 1
Indicates a state in which the fixed contact 1 and the movable contact 2 are completely separated. FIG. 2 shows a state in which the fixed contact 1 and the movable contact 2 are closed. In FIG. 1, it is a fixed contactor 1 and a piston 4 that are fixed to a casing (not shown) of the switch, and the other parts are axially (left and right in the figure) relatively to them. Move to. The movable contactor 2 moves leftward in the drawing and is electrically connected to the fixed contactor 1 as shown in FIG. 2 to make an electrical connection, and is connected to an operation rod 6 driven by a drive mechanism (not shown). Has been done.
The operating rod 6 is integrally connected to the cylinder 3. The piston 4 is provided and fixed in the cylinder 3. The puffer chamber 5 is a space surrounded by the cylinder 3 and the piston 4. The insulating nozzle 7 made of an insulating material is fixed to the cylinder 3 and has a substantially cylindrical shape surrounding the movable contact 2. A disk-shaped support 10 made of an insulating material is provided inside the operation rod 6. The conductor rod 9 is supported by the support body 10 coaxially with the movable contactor 2, that is, at the central axis position of the movable contactor 2 so as to face the opening 1 a of the fixed contactor 1. When the switch is closed, the tip of the opening 1 of the fixed contact 1 is opened.
a) (see FIG. 2). All parts shown in the figure except the insulating nozzle 7 and the support 10 are made of metal, such as copper or copper alloy.

Next, the opening / closing operation of the switch in the first embodiment will be described. When the operating rod 6 is pulled rightward in the drawing from the closed state shown in FIG. 2, the fixed contact 1 and the movable contact 2 are separated from each other, and an arc A is generated therebetween. FIG. 3 is a sectional view showing the state at that time and the potential distribution between the contacts. As shown in FIG. 3, while the fixed contact 1 is still inside the insulating nozzle 7, an intermediate potential between the fixed contact 1 and the movable contact 2 is formed by the conductor rod 9. As a result, a potential distribution B as shown in FIG. 3 is formed. That is, the electric field is disturbed by the tip of the conductor rod 9 protruding from the movable contact 2, and a strained portion C is generated on the equipotential surface. The presence of such a strained portion C acts to reduce the withstand voltage capability of the region. Therefore, the withstand voltage between the fixed contact 1 and the movable contact 2 becomes low. In the state shown in FIG. 3, since the cylinder 3 moves together with the movable contact 2, the insulating arc-extinguishing gas in the puffer chamber 5 is compressed by the cylinder 3 and the piston 4. The compressed gas is guided toward the arc A along the internal shape of the insulating nozzle 7 and blown onto the arc A. However, the arc is less likely to be extinguished due to the decrease in withstand voltage. At the time when the fixed contact 1 relatively goes out of the insulating nozzle 7, the relative separation distance between the fixed contact 1 and the movable contact 2 reaches a predetermined value, and the interval of the equipotential curve becomes wider. Accordingly, the influence of the strained portion C is reduced.
Therefore, sufficient dielectric strength is obtained between the contacts, and the arc is easily extinguished in combination with the spraying of the insulation arc-extinguishing gas. In Figure 4,
The electric potential distribution after arc extinction is completed is shown. Since the conductor rod 9 is insulated from the movable contact 1, the provision of the conductor rod 9 is unlikely to cause re-ignition easily.

[Second Embodiment] FIG. 5 is a sectional view showing a second embodiment. The same or corresponding parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the second embodiment, the operating rod 6
The plurality of ventilation holes 6a are provided in the cylindrical wall surface portion of the above, and the plurality of ventilation holes 10a are also provided in the support body 10. Figure 6
FIG. 3 is an enlarged front view showing only the support 10 and the conductor rod 9.
When the vent holes 6a and 10a are provided in this way, the insulating arc-extinguishing gas is not only blown along the inner peripheral portion of the insulating nozzle 7, but also passes through the vent holes 6a and 10a and passes through the movable contactor 2. The arc is blown from the inside. As a result of the experiment, according to such a configuration, the arc extinguishing performance when the fixed contact 1 leaves the insulating nozzle 7 is improved. In this example, the number of the ventilation holes 6a and 10a is four, but it goes without saying that other numbers may be used.
Further, it goes without saying that the shape of the ventilation hole does not have to be circular.

[Third Embodiment] FIG. 7 is a sectional view showing a third embodiment. The same or corresponding parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the third embodiment, in addition to the structure shown in the first embodiment, a drive device 13 for independently driving the conductor rod 9 is provided.
Is provided. The conductor rod 9 is insulated and supported by a support 10 so as to be slidable in the axial direction. That is, the support body 10 is fixed to the operation rod 6, and the conductor rod 9 slides on the support body 10. The drive device 13 moves the conductor rod 9 by hydraulic pressure. Thus, the drive source of the movable contactor 2 and the drive source of the conductor rod 9 are different. Therefore, the conductor rod 9 can be moved at a speed different from that of the movable contactor 2 without being synchronized with each other. For example, when the fixed contact 1 approaches the outlet of the insulating nozzle 7, if the conductor rod 9 is moved to the right in the figure faster than the movable contact 2, the conductor rod 9 is moved to the fixed contact 1.
It is possible to quickly move away from the movable contactor 2 and to shorten or retract the protruding length from the end of the movable contactor 2. As a result, the withstand voltage rises quickly, which facilitates extinguishing the arc. As a modified example of the present embodiment, the conductor rod 9 may be fixed to the support 10 and the support 10 may slide with respect to the operation rod 6, but unnecessary vibration of the conductor rod 9 may occur. From the viewpoint of preventing the above, it is preferable to support the conductor rod 9 so as to be slidable with respect to the support body 10. In the third embodiment described above, the drive device 13 is described as moving the conductor rod 9 by hydraulic pressure, but it goes without saying that a drive device other than hydraulic pressure may be used.

[Fourth Embodiment] FIG. 8 is a sectional view showing a fourth embodiment. The same or corresponding parts as those of the first or third embodiment are designated by the same reference numerals and the description thereof will be omitted. This figure shows a state in which the switch is in the middle of the opening / closing operation. The spring 14 (coil spring) connects the conductor rod 9 and the drive device 13 to each other. The claw 15 is made of, for example, a leaf spring formed by bending a flat plate into a mountain shape. The conductor rod 9 is fixed to the support body 10, and the support body 10 is slidable with respect to the operation rod 6.
In the closed state of the switch, the support 10 is closer to the fixed contact 1 than the claw 15 (the same as the state shown in the figure). When the switch enters the opening / closing operation and the movable contactor 2 and the drive device 13 start moving, the drive device 13 is preliminarily adjusted so as to move faster than the movable contactor 2. Then, the conductor rod 9, which is initially fixed to the support body 10, is pulled by the drive device 13 in the right direction in the figure, and tries to move. However, since the claw 15 prevents the support 10 from sliding, the conductor rod 9 does not move. Therefore, the spring 14 between the conductor rod 9 and the drive 13 is stretched and stored. Then, when the fixed contact 1 approaches the outlet of the insulating nozzle 7, the elastic force of the spring 14 and the claw 15 is adjusted in advance so that the claw 15 reaches a predetermined elastic deformation and can no longer stop the support 10. Ok
The support 10 moves over the claws 15 and moves. As a result,
The spring 14 is released and the conductor rod 9 is rapidly driven to the right. Thus, by adjusting the elasticity of the spring 14 and the elasticity of the claw 15 as the locking member, it is possible to control the timing at which the conductor rod 9 starts to move rapidly. On the other hand, during the closing operation, the drive device 13 causes the spring 14 to move.
The support 1
0 easily passes through the claw 15 and returns to the illustrated state. In the fourth embodiment, the claw 15 is arranged only at one place, but a plurality of claws 15 may be arranged annularly on the inner circumference of the operation rod 6.

[Fifth Embodiment] FIG. 9 is a sectional view showing a fifth embodiment. The same or corresponding parts as those of the first or fourth embodiment are designated by the same reference numerals and the description thereof will be omitted. The difference from the fourth embodiment is that the structure for sliding the conductor rod 9 and the structure for storing the spring 14 are different. That is, the conductor rod 9 is slidable with respect to the support body 10, and the support body 10 is operated by the operation rod 6
It is fixed to. The movable claw 16 is made of an insulating material. The movable claw 16 has one end fixed to the conductor rod 9 and the other end locked to the claw 15. In the closed state, the movable claw 16 is closer to the fixed contact 1 than the claw 15 (the same as the illustrated state). When the switch enters the opening / closing operation and the movable contactor 2 and the drive device 13 start moving, the drive device 13 is preliminarily adjusted so as to move faster than the movable contactor 2. First, the conductor rod 9 is the driving device 13
Tries to start moving by pulling to the right in the figure, but the nail 1
Since the movable claw 16 serving as a locking piece is locked by 5, the conductor rod 9 does not move. Therefore, the spring 14 between the conductor rod 9 and the drive 13 is stored. And fixed contactor 1
If the elastic force of the spring 14 and the claw 15 is adjusted in advance so that the claw 15 reaches a predetermined elastic deformation and can no longer stop the movable claw 16 when the claw 15 approaches the outlet of the insulating nozzle 7, The movable claw 16 fixed to the claw 15
Move over. As a result, the spring 14 is released,
The conductor rod 9 is driven rapidly. In this way, by adjusting the elasticity of the spring 14 and the claw 15, it becomes possible to control the timing at which the conductor rod 9 starts to move rapidly.
On the other hand, during the closing operation, the drive device 13 causes the spring 1 to move.
When the movable claw 16 is pushed further while being compressed, the movable claw 16 easily passes through the claw 15 and returns to the illustrated state. In this way, the support 10 is fixed to the operation rod 6 and the support 1
By sliding the conductor rod 9 with respect to 0 and providing the movable claw 16 separately from the support body 10, it is possible to suppress unnecessary vibration of the conductor rod 9 during the opening and closing operations. it can. Although the spring 14 and the claw 15 are described as the coil spring and the leaf spring, respectively, in the fourth and fifth embodiments, it goes without saying that other elastic bodies such as rubber may be used.

[Sixth Embodiment] FIG. 10 is a sectional view showing a sixth embodiment. The parts denoted by reference numerals 2 to 7 are the same as those in the first embodiment, and the description thereof will be omitted. The notch 1b provided in the fixed contact 1 is provided at a position separated from the tip of the fixed contact 1 by a predetermined distance, and the shape thereof is an acute angle and
The fixed contact 1 is obliquely cut in the direction from the tip to the root. The fixed contact 1 is formed by the cut portion 1b.
The electric potential distribution around is distorted, and as shown in FIG.
To have. Due to the distortion of the potential distribution, when the fixed contact 1 and the movable contact 2 are approaching, the electric field near the movable contact 2 is deformed. If the distance between the fixed contact 1 and the movable contact 2 is more than a certain distance, the movable contact 2
The distortion of the electric field in the vicinity is reduced. In addition, in FIG. 10, the front end portion and the base portion of the fixed contact have the same diameter with the cut 1b as a boundary, but they may have different diameters. The position of the cut 1b and the cut angle are set in advance after the switch enters the opening operation and the fixed contact 1 comes out of the outlet of the insulating nozzle 7, and the influence of the electric field distortion due to the cut 1b extends to the vicinity of the movable contact 2. Decide to disappear. With this configuration, when the fixed contact 1 relatively leaves the insulating nozzle 7, the withstand voltage between the contacts can be rapidly increased. That is, when the fixed contactor 1 is inside the insulating nozzle 7, it is difficult to extinguish the arc, and it is easy to extinguish the arc as soon as it comes out.

[Embodiment 7] FIG. 12 is a sectional view of a fixed contact 1 according to Embodiment 7. The parts other than the fixed contactor 1 are the same as those of the sixth embodiment, and the description and illustration thereof are omitted. In the seventh embodiment, instead of the cut 1b of FIG. 10, a blade portion (protrusion) 1c whose tip is cut at an acute angle is provided annularly over the entire circumference of the fixed contact 1. The notch is formed obliquely in the direction from the tip of the fixed contactor 1 toward the root. Further, the outer diameter of the fixed contactor 1 including the blade portion 1c is formed to be slightly smaller than the inner diameter of the opening 7a (see FIG. 10) of the insulating nozzle 7. As shown in FIG. 13, the blade portion 1c
Due to the presence of, the potential distribution is distorted and the distorted portion C is formed, so that the same effect as that of the sixth embodiment is obtained. Furthermore, since the outer diameter of the annular blade portion 1c is formed to be slightly smaller than the inner diameter of the opening portion 7a of the insulating nozzle 7, when the blade portion 1c is inside the opening portion 7a of the insulating nozzle 7, the blade portion 1c The existence of the arc extinguishes the insulating arc extinguishing gas to the outside of the insulating nozzle 7. Therefore, it is possible to temporarily delay the amount of gas blown to the arc and prevent premature arc extinction not only electrically but also in terms of gas flow.

[Embodiment 8] FIGS. 14 and 15 are a sectional view and a front view of a fixed contactor 1 according to Embodiment 8, respectively. The other parts are the same as those in the sixth embodiment, and the description and illustration thereof are omitted. In the eighth embodiment, instead of the cut 1b in FIG. 10, a plurality of wing-shaped fins 1d are arranged in the fixed contact 1 in the circumferential direction. The tip (right end) of the winged fin 1d forms an acute angle toward the tip of the fixed contact 1. In this example, four feather fins 1d are arranged, but it goes without saying that different numbers may be used. As shown in FIG. 16, the presence of the wing-shaped folds 1d causes the potential distribution to be distorted and the distorted portion C to be formed, so that the same effect as that of the sixth embodiment is achieved.

[Ninth Embodiment] FIGS. 17 and 18 are a sectional view and a front view of a fixed contact 1 according to a ninth embodiment, respectively. The other parts are the same as those in the sixth embodiment, and the description and illustration thereof are omitted. In the ninth embodiment, instead of the cut 1b in FIG. 10, a plurality of protrusions 1e are arranged on the fixed contact 1 in the circumferential direction. In this example, the protrusion 1e is 4
Although they are distributed, it goes without saying that different numbers may be used. Further, it goes without saying that the shape is not limited to a cone and may be various shapes such as a pyramid, a prism, a cylinder, and a triangular plate. As shown in FIG. 19, the presence of the protrusions 1e causes the potential distribution to be deformed and the distorted portion C to be formed, so that the same effect as that of the sixth embodiment is achieved.

In each of Examples 6 to 9 described above, the outer peripheral surface of the fixed contact 1 is provided with a sharp finishing portion, but the outer peripheral surface of the movable contact 2 is not the same as the fixed contact 1. It is also possible to provide the same, and the same effect can be obtained. In addition, the configurations of the first to fifth embodiments and the configurations of the sixth to ninth embodiments can be provided together as needed.

[0041]

Since the present invention is constructed as described above, the following effects are produced.

During the separating operation of the fixed contact and the movable contact of the switch, the sharp end of the fixed contact and the movable contact is in a predetermined position between the fixed contact and the movable contact until the relative separation distance reaches a predetermined value. Since the electric field disturbance conductor is supported so as to be insulated so as to interpose the portion, the electric field disturbance conductor disturbs the electric field between the contacts during the separating operation. Therefore, arc extinguishing is prevented while the distance between the contacts is insufficient, and the arc is extinguished after the distance between the contacts reaches a predetermined length, so that re-ignition can be prevented with sufficient dielectric strength.

Also, a conductor rod is insulated and fixed relative to the movable contactor so as to face the opening of the fixed contactor, and the tip of the conductor bar protrudes from the end of the movable contactor toward the fixed contactor. Since it is provided, the conductor bar disturbs the electric field between the contacts during the opening operation. Therefore, arc extinguishing is prevented while the distance between the contacts is insufficient, and the arc is extinguished after the distance between the contacts reaches a predetermined length, so that re-ignition can be prevented with sufficient dielectric strength.

A cylindrical member connected to the movable contact of the switch, the operating rod having a ventilation hole in its cylindrical wall surface, and the perforated insulating member supported by the inner wall of the operating rod. Since the supporting body for supporting the conductor rod is provided, the insulating arc-extinguishing gas can be guided from the inside of the movable contact to the vicinity of the tip of the movable contact through these portions.

Further, since the drive device for driving the conductor rod relative to the movable contact is provided, the conductor rod can be moved at a speed different from that of the movable contact. Therefore, it is possible to control the speed and timing at which the dielectric strength increases.

A support body fixed to the conductor rod and slidably insulatingly supporting the conductor rod with respect to the movable contact, an elastic member connecting the conductor rod to the driving device, and an elastic body are provided. Since the locking member that locks the support until elastic deformation is provided, the driving force of the driving device can be temporarily stored to some extent and then transmitted to the conductor rod. Therefore, since the dielectric strength can be rapidly increased at a certain point of time, re-ignition can be prevented, and when the arc should be extinguished, the dielectric strength can be increased at a stroke to perform reliable arc extinction.

Further, since the conductor rod is made to slide in the support body, and the locking member for the conductor rod is constituted by the locking piece fixed to the conductor rod and the locking member, the driving force of the driving device is increased. Can be transmitted to the conductor rod after being stored to some extent. Therefore, the dielectric strength can be rapidly increased at a certain point of time, which prevents re-ignition and
When it is necessary to extinguish the arc, the dielectric strength can be increased at a stroke to ensure the arc is extinguished. Moreover, with this configuration, vibration of the conductor rod can be prevented, and adverse effects such as fluctuations in arc extinguishing characteristics due to vibration can be prevented.

Further, since the sharp finishing portion is provided on the outer peripheral surface of at least one of the fixed contact and the movable contact, the electric field around it is disturbed. Therefore, arc extinguishing is prevented while the distance between the contacts is insufficient, and the arc is extinguished after the distance between the contacts reaches a predetermined length, so that re-ignition can be prevented with sufficient dielectric strength.

Further, since the fixed contactor having the portion which is steeply projected or depressed from the outer peripheral surface is provided, the electric field around the fixed contactor is disturbed. Therefore, arc extinguishing is prevented while the distance between the contacts is insufficient, and the arc is extinguished after the distance between the contacts reaches a predetermined length, so that re-ignition can be prevented with sufficient dielectric strength.

Further, since the fixed contact having the annular continuous projection including the sharp finishing portion is provided over the entire circumference of the outer peripheral surface at the predetermined position in the axial direction, the electric field around the fixed contact is disturbed. Therefore, arc extinguishing is prevented while the distance between the contacts is insufficient, and the arc is extinguished after the distance between the contacts reaches a predetermined length, so that re-ignition can be prevented with sufficient dielectric strength. In addition, since the insulating arc extinguishing gas is prevented from flowing while the protrusion is in the insulating nozzle, the arc extinguishing is also impeded from the point of gas flow as long as the distance between the contacts is insufficient.

Further, as an arc extinguishing ability control device, the sharp ends are interposed between the contacts during the opening operation at predetermined positions between the contacts until the relative opening distance reaches a predetermined value. Since the electric field disturbance conductor that is insulated and supported is provided in the electric field disturbance conductor, the electric field disturbance conductor disturbs the electric field between the contacts during the opening operation. Therefore, arc extinguishing is prevented while the distance between the contacts is insufficient, and the arc is extinguished after the distance between the contacts reaches a predetermined length, so that re-ignition can be prevented with sufficient dielectric strength.

Further, since the drive device for driving the electric field disturbance conductor asynchronously with the opening operation is provided, the electric field disturbance conductor can be moved at a speed different from that of the movable contactor. Therefore, it is possible to control the speed and timing at which the dielectric strength increases.

Further, a driving device for driving the electric field disturbance conductor and the electric field disturbance conductor are connected by an elastic member, which is made of an elastic body, and is locked by the electric field disturbance conductor until a predetermined elastic deformation is reached. Since the device is provided, the driving force of the driving device can be temporarily stored to some extent and then transmitted to the electric field disturbance conductor. Therefore, since the dielectric strength can be rapidly increased at a certain point of time, re-ignition can be prevented, and when the arc should be extinguished, the dielectric strength can be increased at a stroke to perform reliable arc extinction.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention, showing a separated state of a contact.

FIG. 2 is a cross-sectional view showing the first embodiment of the present invention, showing a closed state of the contact.

FIG. 3 is a cross-sectional view showing the first embodiment of the present invention, showing a potential distribution during opening of the contact.

FIG. 4 is a cross-sectional view showing a first embodiment of the present invention, showing a potential distribution after arc extinction.

FIG. 5 is a cross-sectional view showing a second embodiment of the present invention, showing a contacted state in a separated state.

6 is an enlarged front view showing only the support 10 of FIG.

FIG. 7 is a cross-sectional view showing a third embodiment of the present invention, showing a separated state of the contactors.

FIG. 8 is a cross-sectional view showing a fourth embodiment of the present invention, showing a state in which the contacts are being separated.

FIG. 9 is a cross-sectional view showing a fifth embodiment of the present invention, showing a state in which the contacts are being separated.

FIG. 10 is a cross-sectional view showing a sixth embodiment of the present invention, showing a separated state of the contactors.

11 is a diagram showing a contour of the fixed contactor 1 shown in FIG. 10 viewed from a side surface and a potential distribution around the contour.

FIG. 12 is a sectional view of a fixed contact of a switch according to a seventh embodiment of the present invention.

FIG. 13 is a diagram showing a contour of the fixed contactor 1 shown in FIG. 12 viewed from a side surface and a potential distribution around the contour.

FIG. 14 is a side view of a fixed contact of a switch according to an eighth embodiment of the present invention.

FIG. 15 is a front view of a fixed contact of a switch according to an eighth embodiment of the present invention.

16 is a diagram showing a contour of the fixed contactor 1 shown in FIGS. 14 and 15 as seen from a side surface and a potential distribution around the contour.

FIG. 17 is a side view of the fixed contact of the switch according to the ninth embodiment of the present invention.

FIG. 18 is a side view of the fixed contact of the switch according to the ninth embodiment of the present invention.

FIG. 19 is a diagram showing a contour of the fixed contactor 1 shown in FIGS. 17 and 18 as viewed from a side surface and a potential distribution around the contour.

FIG. 20 is a cross-sectional view showing a conventional switch. The open state of the contactor is shown.

FIG. 21 is a cross-sectional view showing a conventional switch, showing a state in which the contacts are being separated.

[Explanation of symbols]

 1 Fixed Contact 1a Opening 1b Cut 1c Blade 1d Feather Fin 1e Projection 2 Movable Contact 6 Operation Rod 7 Insulation Nozzle 9 Conductor 10 Support Body 13 Drive Device 14 Spring 15 Claw 16 Movable Claw

Claims (12)

[Claims] 1. A switch for opening and closing a contactor portion in an insulating arc-extinguishing gas, comprising: a fixed contactor; a movable contactor which is supported so as to be able to come into contact with and separate from the fixed contactor; Insulating support so that the sharp end thereof is interposed at a predetermined position between the fixed contact and the movable contact until the relative separation distance reaches a predetermined value during the separation operation of the movable contact. A switch which is provided with: a conductor for disturbing an electric field. 2. A switch which opens and closes a contact portion in an insulating arc-extinguishing gas, wherein a fixed contact having an opening on an end face and a fixed contact disposed to face the end face. A movable contact that is freely supported, and is insulated and fixed relative to the movable contact so as to face the opening, and a tip portion projects from the end of the movable contact toward the fixed contact. A conductor rod, and an insulating nozzle that surrounds the movable contact and the conductor rod and that guides an insulating arc-extinguishing gas to the vicinity of the end of the movable contact. A switch characterized by. 3. A switch which opens and closes a contact portion in an insulating arc-extinguishing gas, a fixed contact having an opening on an end face, and a fixed contact which is arranged so as to face the end face and separates from the fixed contact. A substantially cylindrical movable contact that is freely supported, and a movable contact that is provided at the central axis position of the movable contact so as to face the opening, and has a tip end that is closer to the fixed contact than the end of the movable contact. A conductor rod projecting to the inside, a tubular member connected to the movable contactor, the operating rod having a ventilation hole in its tubular wall surface, and a perforated insulating member supported by the inner wall of the operating rod. And a guide body that supports the conductor rod, and a substantially cylindrical insulator that surrounds the movable contact and the conductor rod, and guides the insulating arc-extinguishing gas to the vicinity of the end of the movable contact. A switch equipped with an insulating nozzle. 4. A switch for opening and closing a contact portion in an insulating arc-extinguishing gas, wherein a fixed contact having an opening on an end face and a fixed contact which is arranged so as to face the end face. A movable contact member that is freely supported, and is insulated and supported so as to be slidable relative to the movable contact member so as to face the opening, and a tip portion of the movable contact member is fixedly contacted with the end portion of the movable contact member. A switch comprising: a conductor rod protruding toward the child side; and a drive device that drives the conductor rod relatively to the movable contactor. 5. A switch which opens and closes a contact portion in an insulating arc-extinguishing gas, wherein a fixed contact having an opening on an end face and a fixed contact disposed to face the end face. A movable contact that is freely supported, and a conductor rod that is provided coaxially with the movable contact so as to face the opening and has a tip protruding from the end of the movable contact toward the fixed contact. A support body fixed to the conductor rod, the support body slidably insulatingly supporting the conductor rod with respect to the movable contact, and a drive device driving the conductor rod relatively to the movable contact. A switch comprising: an elastic member that connects the conductor rod to the drive device; and a locking member that is made of an elastic body and that locks the support body until a predetermined elastic deformation is reached. 6. A switch which opens and closes a contact portion in an insulating arc-extinguishing gas, wherein a fixed contact having an opening on an end face and a fixed contact arranged to face the end face. A movable contact that is freely supported, and a conductor rod that is provided coaxially with the movable contact so as to face the opening and has a tip protruding from the end of the movable contact toward the fixed contact. A support body that is relatively fixed to the movable contactor and that slidably insulates and supports the conductor rod with respect to the movable contactor; and the conductor rod relative to the movable contactor. A drive device that drives to the drive device, an elastic member that connects the conductor rod to the drive device, a locking piece that is made of an insulating material, and is fixed to the conductor rod, and an elastic body until a predetermined elastic deformation is reached. A locking member that locks the locking piece, Switch to be. 7. A switch having a fixed contact and a movable contact in an insulating arc-extinguishing gas, wherein a sharp finishing portion is provided on an outer peripheral surface of at least one of the fixed contact and the movable contact. Switch to be. 8. A switch which opens and closes a contact portion in an insulating arc-extinguishing gas, wherein a fixed contactor having a steeply projecting or recessed portion on its outer peripheral surface and a fixed contactor arranged to face the fixed contactor. A movable contactor that is supported so as to be able to come into contact with and separate from the fixed contactor, and a substantially cylindrical insulator that surrounds the movable contactor. A switch that is equipped with an insulating nozzle that guides the switch. 9. A switch which opens and closes a contact portion in an insulating arc-extinguishing gas, wherein an annular continuous projection portion including a sharp finishing portion is provided over the entire circumference of its outer peripheral surface at a predetermined axial position. A fixed contactor having, a movable contactor arranged to face the fixed contactor and supported so as to be able to come into contact with and separated from the fixed contactor, and a substantially cylindrical insulator surrounding the movable contactor, A switch, comprising: an insulating nozzle that guides an insulating arc-extinguishing gas to the vicinity of the end of the movable contact. 10. An electric field insulated and supported between the contacts during the separating operation so that their sharp ends are interposed at predetermined positions between the contacts until their relative separation distance reaches a predetermined value. An arc extinguishing ability control device comprising a disturbance conductor. 11. An electric field insulated and supported between contacts during a separating operation so that their sharp ends are interposed at predetermined positions between the contacts until their relative separation distance reaches a predetermined value. An arc extinguishing capability control device comprising: a disturbance conductor; and a drive device that drives the electric field disturbance conductor asynchronously with the opening operation. 12. An electric field insulated and supported between the contacts during the separating operation so that their sharp ends are interposed at predetermined positions between the contacts until their relative separation distance reaches a predetermined value. A conductor for disturbance, a drive device for driving the conductor for electric field disturbance, an elastic member for connecting the conductor for electric field disturbance to the drive device, and an elastic member, and the conductor for electric field disturbance until a predetermined elastic deformation is reached. An arc extinguishing ability control device comprising: a locking device for locking the.