JP3265038B2 - Switch - Google Patents

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, which generates an arc when current is interrupted.

[0002]

2. Description of the Related Art FIG. 24 is a schematic side view of a conventional switch disclosed in, for example, the document "Power circuit breaker" (publisher: The Institute of Electrical Engineers of Japan, author: The Institute of Electrical Engineers of Japan, P.185). FIG. 25 is a sectional view taken along line CC of FIG. In the figure, reference numeral 1 denotes a fixed conductor, 1A denotes a fixed contact joined to the fixed conductor 1, 2 denotes a movable conductor joined to a movable contact 2A which comes into contact with and separates from the fixed contact 1A, and the movable conductor 2 is not shown. It is designed to be driven by a movable contact driving device. 3 is an arc generated between the fixed contact 1A and the movable contact 2A when the movable contact 2A is separated from the contact when the current is interrupted;
Reference numeral 4 denotes a nozzle for blowing gas, and reference numeral 50 denotes a gas blown from the nozzle 4 to the arc 3. As the gas 50, for example, a gas such as air or SF ₆ gas is used.

Next, the operation will be described. Movable contact 2A
When the movable contact driving device is operated in the energized state where the fixed contact 1A is in contact with the fixed contact 1A, the movable contact 2A is separated from the fixed contact 1A to be in a current interrupting state, and the fixed contacts 1A
Arc 3 is generated between and movable contact 2A. At this time, a valve (not shown) of the four nozzle system is opened, and the gas 50 is blown from the nozzle 4 to the arc 3. In this case, the blowing gas 50 flows around the arc 3 as shown in FIG. 25, and cools the arc 3 from the outer periphery, whereby the arc 3 is extinguished.

[0004]

Since the conventional switch is constructed as described above, the temperature of the arc 3 is reduced by cooling the arc 3 from the outer periphery with the gas 50 blown out from the nozzle 4. The lowest at the outer periphery, the higher the closer to the center of the arc 3, and the highest at the center, there is a problem that the temperature at the center of the arc is hard to decrease and the arc cooling efficiency is poor. As a result, there is a problem that the electron density at the center of the arc is increased, and a large current cannot be cut off.

[0005] The present invention has been made to solve the above problems, an object of the invention as claimed in claim 1, so as to be cooled arc during current interruption from both inside and periphery thereof Arc cooling efficiency can be further improved
It is an object of the present invention to obtain a switch having excellent current interruption performance .

[0006]

An object of the invention of claim 2 is to provide a switch which can be repeatedly used by recovering the arc cooling medium.

An object of the invention of claim 3, by releasing negative atoms from the arc cooling medium, further is to obtain a switch which can be further enhanced current interruption performance.

A fourth object of the present invention is to obtain a switch having excellent current interrupting performance by increasing the specific surface area of the arc cooling medium and improving the arc cooling efficiency.

[0010] The objects of claims 5 and 6 are as follows.
An object of the present invention is to obtain a switch excellent in current interruption performance by increasing the probability of a cooling medium hitting an arc and improving the arc cooling efficiency.

An object of the invention of claim 7, can be easily enters the cooling medium with respect to the arc, and is to obtain a switch which achieves a simplified structure of the switch itself.

An object of the invention of claim 8 is to obtain the effective use can be reduced switch to reduce the waste of arc cooling medium.

[0013]

Means to solve the Problems] switch according to a first aspect of the invention, during current interruption to the fixed contact and the movable contact is separated opens, blow a gas into the arc generated between these two contacts
A switch for extinguishing the arc by attaching
The granular insulating material is caused to enter the arc at the application pressure .

[0014]

A switch according to a second aspect of the present invention is configured such that the granular insulator incident on the arc is recovered, and the recovered granular insulator is repeatedly incident on the arc.

According to a third aspect of the present invention, there is provided a switch using a negative insulator as a granular insulator.

In the switch according to a fourth aspect of the present invention, the granular insulator is made of plate-like particles.

The switch according to the fifth aspect of the present invention is provided with an insulator guide that guides the granular insulator to the arc generating region and makes it easier for the arc to stay.

According to a sixth aspect of the present invention, there is provided a switch wherein a fixed conductor including a fixed contact is formed in a cylindrical shape, and a granular insulator is sprayed from the inside of the cylindrical shape onto the arc.

According to a seventh aspect of the present invention, in the switch, the movable conductor including the movable contact is formed in a cylindrical shape, and a granular insulator is sprayed from the inside of the cylindrical shape to the arc.

According to an eighth aspect of the present invention, the granular insulator is sprayed on the arc before the movable contact is almost fully opened.

[0022]

[Action] switch in the invention of claim 1. The gas against the arc generated between the fixed contact and the movable contact upon current interruption
Particulate insulator enters the arc due to body spray pressure
When the arc is cooled by a granular insulator from the inside,
In addition, the arc is cooled from the outer periphery by the blowing gas.
Is done. Therefore, the arc cooling efficiency is further improved.

[0023]

In the switch according to the second aspect of the present invention, the granular insulating material incident on the arc is collected and repeatedly incident on the arc, so that the granular insulating material is not wasted and its use efficiency is improved.

The switch according to the third aspect of the present invention uses a granular insulator containing a negative atom as a granular insulator.
The electrons in the arc are captured by the negative atoms that are released by being decomposed from the granular insulator by the arc heat.

In the switch according to the fourth aspect of the present invention, since the granular insulating material is composed of plate-like particles, the specific surface area of the granular insulating material is increased, so that the arc is effectively cooled.

In the switch according to the fifth aspect of the present invention, the probability of the granular insulator hitting the arc is provided by providing the insulator ejection guide for guiding the granular insulator to the arc generating region and making the arc easy to stay. Therefore, the arc is effectively cooled and the current interruption performance is improved.

In the switch according to the sixth aspect of the present invention, the fixed conductor including the fixed contact has a cylindrical shape, and the granular insulator is blown from the inside of the cylindrical shape to the arc, so that the probability that the granular insulator hits the arc is high. As a result, the arc is effectively cooled and the current interrupting performance is improved, and a complicated mechanism or the like dedicated to arc spraying is not particularly required, so that the switch configuration is simplified.

In the switch according to the seventh aspect of the present invention, the movable conductor including the movable contact has a tubular shape, and the granular insulator is blown from the inside of the tubular shape to the arc, so that the probability that the granular insulator hits the arc is reduced. As in the case of claim 6 , the arc is effectively cooled and the current interruption performance is improved, and a complicated mechanism or the like dedicated to arc spraying is not particularly required. Becomes easier.

In the switch according to the eighth aspect of the present invention, the granular insulator is sprayed on the arc before the movable contact is almost fully opened, so that the granular insulator is not wasted, and the granular insulator is effectively used and the granular insulator is used. The amount is reduced.

[0031]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. 1 is a schematic side view of a switch according to a first embodiment corresponding to the first aspect of the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is an enlarged cross-sectional view of the arc in FIG. 4 is an enlarged view showing one particle of the granular insulator which is the arc cooling medium of FIG. 3, and the same or corresponding parts as those in FIGS. 24 and 25 are denoted by the same reference numerals, and redundant description is omitted. In the figure, 5 is a granular insulator as an arc cooling medium,
The granular insulator 5 is formed of spherical particles made of, for example, an acrylic resin, a phenol resin, an epoxy resin, or the like, and is generated between the fixed contact 1A and the movable contact 2A when current is cut off when the contacts are separated. The nozzle 3 is blown against the arc 3. Note that the fixed contact 1A and the movable contact 2A are in contact with each other before current interruption.

Next, the operation of the first embodiment will be described. For example, when a large current such as a short-circuit current flows in the load side circuit and a movable contact driving device (not shown) operates, the fixed contact 1A
, The movable contact 2A is separated from the fixed contact 1A, and the arc 3 is generated between the fixed contact 1A and the movable contact 2A as in the conventional case. At this time, the granular insulator 5 is sprayed from the nozzle 4 onto the arc 3, so that the granular insulator 5
Enters the arc 3.

As described above, the surface of the granular insulator 5 incident on the arc 3 is strongly heated by the arc heat. As a result, the surface of the granular insulator 5 undergoes decomposition, and a very large amount of decomposition gas is released from the surface as indicated by the arrow in FIG.

In this case, when the granular insulator 5 is a particle made of an acrylic acid resin, since acrylic acid is formed of oxygen atoms, carbon atoms, hydrogen atoms, etc., as shown in FIG. A large amount of oxygen atoms O, carbon atoms C, hydrogen atoms H and the like are released from the granular insulator 5, and the released atoms cool the arc 3 from the inside, and the decomposition energy of the granular insulator 5 is reduced by the arc 3. The arc 3 is strongly cooled. Therefore, the arc cooling efficiency is greatly improved as compared with the case where a gas such as simple air or SF6 gas is used as the arc cooling medium, and extremely excellent current interruption performance can be obtained.

Embodiment 2 FIG. FIG. 5 is a cross-sectional view of a switch according to a second embodiment of the present invention. In the figure, reference numeral 6 denotes an arc-extinguishing chamber container, and a fixed contact 1A is fixed by attaching and fixing a fixed conductor 1 to one side wall portion. It is located inside the arc extinguishing chamber container 6. A movable conductor 2 is attached to the other side wall of the arc-extinguishing chamber container 6 so as to be able to reciprocate, and a movable contact 2A thereof comes into contact with and separates from the fixed contact 1A.

Reference numeral 7 denotes a movable contact driving device, which comprises an electromagnetic mechanism having a fixed iron core 8, an exciting coil 9, and a movable iron core 10 having a plunger configuration.
Are connected. Reference numeral 11 denotes a compression spring for urging the movable conductor 2 in a direction in which the movable contact 2A contacts the fixed contact 1A, and 12 denotes a spring receiver integrated with the movable conductor 2.

Reference numeral 13 denotes a piston which is reciprocally slidably fitted in the nozzle 4 to allow the granular insulator 5 to be incident on the arc 3. Reference numeral 13 a denotes a flange integrally provided at the lower end of the piston 13. Reference numeral 14 denotes a compression spring that urges the piston 13 in a direction in which the granular insulator 5 is emitted from the nozzle 4, and 15 denotes a fixing plate for receiving the spring.

Reference numeral 16 denotes a four-system nozzle driving device (cooling medium firing system driving device). The nozzle system driving device 16 has a fixed iron core 17, an exciting coil 18, and a lock lever 19, The lock lever 19 is rotatable about a lower pivot pin 20 and has a lock claw 19a at a free end thereof.
At the lower position of the piston 1
3 is locked.

Next, the operation of the second embodiment will be described. FIG. 6 is an operation explanatory diagram of FIG. In the contact closed state shown in FIG. 5, the exciting coil 9 of the movable conductor 2 is not excited, so that the movable conductor 2 advances by the compression spring 11 and the movable contact 2A comes into contact with the fixed contact 1A. ing.
In this energized state, the four pistons 13
Is locked by a lock lever 19 at a retracted position against the compression spring 14.

In such an energized state, for example, when a short-circuit current or the like flows in the load-side circuit, a voltage is applied to the exciting coil 9 of the movable contact driving device 7 by a signal detected therefrom, and the current is applied to the exciting coil 9. By flowing
The movable iron core 10 of this system is attracted to the fixed iron core 8 against the compression spring 11. Thereby, as shown in FIG. 6, the movable contact 2A is separated from the fixed contact 1A, and an arc 3 is generated between the fixed contact 1A and the movable contact 2A. At this time, the excitation coil 18 of the nozzle system driving device 16 is excited with a slight time delay, so that the lock lever 19 composed of the movable core of this system is attracted by the fixed core 17. Thereby, the lock lever 19 is connected to the support pin 2.
It rotates clockwise in the figure around 0.

As a result, the lock claw 1 of the lock lever 19
9a comes off the flange 13a of the piston 13. Then
The piston 13 rises at a high speed by the elastic force of the compression spring 14,
The granular insulator 5 in the nozzle 4 is forcibly fired toward the arc 3. As a result, the arc 3 is intensely cooled by the incident granular insulator 5 and extinguished as in the case of the first embodiment, and the current is interrupted.

After the current is cut off, when the current of the exciting coil 9 of the movable contact driving device 7 is cut off, the movable conductor 2 is pushed by the compression spring 11 of this system, and the movable contact 2A becomes the fixed contact 1A. The current is re-energized by contacting the. In this case, the piston 13 is returned to the original lowered position shown in FIG. 5 by the driving means (not shown) against the compression spring 14, and the exciting coil 18 of the nozzle driving device 16 is de-energized at the lowered position. Lock lever 1
9 returns to the initial state by returning to the original piston lock position by a spring (not shown).

Embodiment 3 FIG. FIG. 7 is a sectional view of a switch according to a third embodiment corresponding to the third aspect of the present invention.
Numeral 21 denotes a granulator as a granular insulator collecting means. This granulator 21 is a funnel whose bottom is integrally connected to the peripheral edge of the upper end of the nozzle 4 in the arc-extinguishing chamber container 6 in the second embodiment. The granular insulator 5 blown out from the nozzle 4 in a shape is returned into the nozzle 4. Therefore,
According to the third embodiment, the granular insulator 5 once emitted from the nozzle 4 toward the arc 3 falls into the granulator 21, slides down the granulator 21, and is returned into the nozzle 4. Therefore, the nozzle 4 can collect the fired granular insulator 5 and repeatedly fire it, and thus can repeatedly cut off the current.

Embodiment 4 FIG. FIG. 8 is a cross-sectional view of a switch according to Embodiment 4 of the present invention, in which 6a is an exhaust hole provided in the top wall of the arc-extinguishing chamber container 6, 22 is a gas storage tank,
23 is a compressed gas stored in the gas storage tank 22;
Reference numeral 4 denotes an air supply pipe connecting the inside of the gas storage tank 22 to the bottom of the nozzle 4, 25 denotes an electromagnetic valve attached in the middle of the air supply pipe 24, 26 denotes a bottom partition plate of the nozzle 4, 2.
Reference numeral 6a denotes a plurality of ventilation holes provided in the bottom partition plate 26. The ventilation holes 26a have a diameter such that the granular insulator 5 loaded in the nozzle 4 does not drop.

Next, the operation of the fourth embodiment will be described. When the movable contact 2A is separated from the fixed contact 1A and an arc is generated between those contacts, the electromagnetic valve 25
Is opened. Then, the compressed gas 23 in the gas storage tank 22
Through the air line 24 into the nozzle 4 and its bottom partition 26
, The compressed gas 23 blows out from the nozzle 4 toward the arc, and the granular insulating material 5 is also simultaneously blown from the nozzle 4 by the blowing pressure.

In this way, the compressed gas 23 blown out of the nozzle 4 cools the arc from the surroundings, and at the same time, the granular insulator 5 emitted from the nozzle 4 is different from the case of FIG. The same action cools the arc from the interior. Therefore, according to the fourth embodiment, a switch having more improved arc cooling efficiency than that of the first embodiment and excellent current interrupting performance can be obtained.

In the fourth embodiment, the gas 23 blown out into the arc-extinguishing chamber container 6 is discharged to the outside through the exhaust hole 6a. Further, the compressed gas 23 may be formed by a puffer mechanism, such as a puffer-type circuit breaker disclosed in the document “Power circuit breaker” (publisher: The Institute of Electrical Engineers of Japan; May be compressed and sprayed on the arc.

Embodiment 5 FIG. FIG. 9 is a circuit diagram of a switch according to Embodiment 5 of the present invention. In the fifth embodiment, two switches configured as in the first to fourth embodiments are connected in parallel. In the figure, reference numeral 27 denotes a first (for energization) switch, 28 denotes a second (for interruption) switch,
The inter-terminal resistance of the first switch 27 is configured to be smaller than the inter-terminal resistance of the second switch 28. As the second switch 28, the switch of the present invention described in the first to fourth embodiments, for example, the switch shown in FIG. 7 is used.

In the fifth embodiment, most of the current flows through the first
After the first switch 27 is opened and the current flowing through the switch 27 is diverted to the second (breaking) switch 28, the switch 28 is opened and the current is cut off. According to the fifth embodiment, the granular insulator 5 is formed on the contact surface of the second switch 28 by any chance.
Even if the resistance between the terminals of the switch 28 is increased due to the adhesion of the first switch 27, the current supply performance is ensured by the first switch 27, so that the current supply reliability can be improved.

Embodiment 6 FIG. FIG. 10 is a circuit diagram of a switch according to the sixth embodiment of the present invention. In the sixth embodiment, a resistor 29 is connected in series to the second switch 28 in the fifth embodiment. Also in the sixth embodiment, most of the current before the interruption flows through the first switch 27. In this state, when the first switch 27 opens, the switch 27
After the current flowing through the second switch 28 is commutated to the second switch 28, the current is limited by the resistor 29, and then the second switch 28 is opened, and the current limited by the resistor 29 is
Of the switch 28.

In the sixth embodiment, even if the particulate insulator 5 adheres to the contact surface and the resistance between the terminals of the second switch 28 is increased, the first switch 27 ensures the current-carrying performance. Therefore, it is possible not only to improve the current-carrying performance but also to provide a feature that a large current such as a short-circuit current can be limited.

Embodiment 7 FIG. In each of the above embodiments, the case where the acrylic resin is used as the granular insulator 5 has been described, but the granular insulator 5 containing a negative atom may be used. For example, if a resin containing a large amount of fluorine, which is a kind of negative atom, such as polytetrafluoroethylene, polychlorotrifluoroethylene, vinyl fluoride, ethylene trifluoride, vinylidene fluoride, or propylene hexafluoride is used,
Since fluorine, a negative gas, is released and adsorbs electrons,
The current interruption performance is further improved. For example, when the granular insulator 5 made of polytetrafluoroethylene is used, polytetrafluoroethylene is formed of fluorine atoms and carbon atoms, so that as shown in FIG.
And carbon atoms C are released from the granular insulator 5.

As described above, when polytetrafluoroethylene is used as the granular insulator 5, a large number of fluorine atoms, one of the negative atoms having the property of easily adsorbing electrons in the arc, are released, so that the current interruption performance is reduced. Is enhanced. The negative atoms include, for example, chlorine, bromine, sulfur, etc. in addition to fluorine. If the granular insulator 5 is made of a material containing a negative atom, the granular insulator 5 becomes a negative atom in the arc 3. Is released in a large amount, and electrons are adsorbed by the negative atoms, so that the current interrupting performance is significantly improved.

Embodiment 8 FIG. FIG. 12 is a perspective view showing a granular insulator according to the eighth embodiment of the present invention. In each of the above embodiments, the spherical granular insulator 5 is used. In the eighth embodiment, cubic or rectangular particles are used.

Embodiment 9 FIG. FIG. 13 is a perspective view showing a granular insulator according to a ninth embodiment of the present invention. In the ninth embodiment, the granular insulator 5 has a columnar shape.

Embodiment 10 FIG. FIG. 14 shows Embodiment 1 of the present invention.
FIG. 10 is a diagram showing the shape of a granular insulator according to Example 10;
The shape is as shown in FIG.

Embodiment 11 FIG. FIG. 15 is a perspective view of a granular insulator according to an eleventh embodiment corresponding to the fifth aspect of the present invention. In the eleventh embodiment, the granular insulator 5 has a plate shape. As described above, since the plate-like granular insulator 5 has a large surface area, the arc cooling efficiency is further improved, and therefore, the current interruption performance is further improved.

Embodiment 12 FIG. FIG. 16 shows Embodiment 1 of the present invention.
FIG. 13 is a schematic configuration diagram showing a main part of a switch according to Embodiment 2; in Example 12, an arc 3 generated between a fixed contact 1A and a movable contact 2A at the time of interruption is cut along a longitudinal direction of the arc 3; The nozzle 4 is arranged obliquely so that the granular insulator 5 is fired.

Since the granular insulator 5 emitted from such a nozzle 4 enters the arc 3 substantially along the longitudinal direction of the arc 3, the arc 3 can be cooled more efficiently. Therefore, the current interruption performance is further improved.

Embodiment 13 FIG. FIG. 17 shows Embodiment 1 of the present invention.
FIG. 13 is a schematic configuration diagram showing a main part of a switch according to Embodiment 3. In Embodiment 13, two nozzles 4A and 4B are provided, and the nozzles 4A and 4B are individually fired substantially along the longitudinal direction of the arc 3. The two nozzles 4 </ b> A and 4 </ b> B are arranged obliquely so that the granular insulator 5 intersects substantially at the center of the arc 3. Therefore, according to the thirteenth embodiment, the arc 3 can be cooled remarkably and efficiently, and the current interruption performance is further remarkably improved.

Embodiment 14 FIG. FIG. 18 shows Embodiment 1 of the present invention.
14 is a cross-sectional view of a main part of a switch according to Embodiment 4. In Embodiment 14, an insulator ejection guide 30 is provided at the tip of a nozzle 4. FIG. In this case, the injection guide 30 is formed so as to surround the generation region of the arc 3 from both sides, and to allow the movable contact 2A to move toward and away from the fixed contact 1A.

According to the fourteenth embodiment, an arc 3 is generated in the ejection guide 30 of the nozzle 4, and the granular insulator 5 radiated from the nozzle 4 and guided by the ejection guide 30 is applied to the arc 3. Because almost all of
The arc cooling efficiency is further remarkably improved, and therefore, the current interruption performance is further remarkably improved.

Embodiment 15 FIG. FIG. 19 is a sectional view of a switch according to a fifteenth embodiment corresponding to the seventh and eighth aspects of the present invention. In the fifteenth embodiment, the fixed conductor 1 including the fixed contact 1A is formed in a through-tube shape. The piston 13 of the cooling medium firing system drive device 16 is inserted into the cylindrical interior 1B so as to be slidable in a reciprocating manner. The other configuration is the same as that of the second embodiment shown in FIGS.

According to the fifteenth embodiment, the granular insulator 5 pre-loaded inside the cylindrical portion of the fixed conductor 1 including the fixed contact 1A has a high speed due to the unlocking of the piston 13 when the current is interrupted. Since the granular insulator 5 is directly incident on the arc 3 by being radiated in parallel to the arc 3 due to the rise, all of the granular insulator 5 comes into contact with the arc 3 and the arc cooling efficiency is reduced. Even better. Therefore, a switch having remarkably high current interruption performance can be obtained.

Embodiment 16 FIG. FIG. 20 is a sectional view of a switch according to Embodiment 16 corresponding to the ninth aspect of the present invention. In the drawing, reference numeral 31 denotes an insulative mover mounting plate mounted on the spring receiver 12 integrated with the movable conductor 2, 32 denotes an elastic metal mover connected to the mover mounting plate 31, and 33 denotes the mover. 32, a stator contact that can be brought into contact with and separated from the mover contact 33; 35, a metal stator to which the stator contact 34 is joined; and 36, a movable contact driver 7 system. An electric wire that electrically connects the exciting coil 18 to the mover 32, a first lead wire 37 that is electrically connected to the stator 35, and an electric wire 38 that is connected to the exciting coil 18 of the cooling medium emission system The second lead wire is electrically connected, and a voltage is applied between the first lead wire 37 and the second lead wire 38.

Next, the operation of the sixteenth embodiment will be described. Movable conductor 2 by movable contact drive device 7 when current is interrupted
During the operation in the contact separating direction, the mover contact 33 comes into contact with the stator contact 34. The point of contact is the movable contact 2A
At the time immediately before fully opened. Such a movable contact 2A
Immediately before the fully open state, the exciting coil 18 of the cooling medium emitting system is excited, the lock lever 19 is sucked and rotated in the unlocking direction of the piston 13, and the piston 13 is
As a result, the granular insulator 5 is sprayed from the nozzle 4 onto the arc 3 immediately before the movable contact 2A is fully opened. In this manner, the granular insulator 5 is incident on the arc 3 immediately before the movable contact 2A is fully opened, so that the granular insulator 5 is not wasted, the amount of the granular insulator 5 used is reduced, and the effective use of the granular insulator 5 is reduced. I can do it.

Embodiment 17 FIG. FIG. 21 is a sectional view of a switch according to a seventeenth embodiment corresponding to the ninth aspect of the present invention, and FIG.
FIG. 1 is an enlarged sectional view taken along the line BB of FIG.
The movable contact 2A is opposite to the case of the embodiment 15 (FIG. 19).
The movable conductor 2 including
The piston 13 is reciprocally slidably inserted into the piston 13 and the granular insulator 5 is loaded in the cylindrical interior 2B above the piston 13. A guide slit 2C is provided in the peripheral wall of the movable conductor 2, and a fixed rod 39 protruding outward through the slit 2C is integrally connected to the lower part of the piston 13 so as to be fixed. The piston 13 is fixedly held at a fixed position by a rod 39. Therefore, the movable conductor 2 is moved up and down by the slit 2C using the fixed rod 39 as a guide, but the slit 2C has a slit width of the granular insulator 5.
Is formed so as to be narrower than the particle diameter, so that the granular insulator 5 does not leak from the slit 2C. With this configuration, in the seventeenth embodiment, the operation of contacting and separating the movable contact 2A with respect to the fixed contact 1A and the emission of the granular insulator 5 are performed by one movable contact driving device 7.

Next, the operation of the seventeenth embodiment will be described. FIG. 23 is an explanatory diagram of the operation of FIG. Fixed contact 1A
In the energized state shown in FIG.
For example, when the exciting coil 9 is excited by a short-circuit current or the like of the load side circuit, the movable core 10 is
As shown in FIG. 23, when the movable conductor 2 descends, the movable contact 2A is separated from the fixed contact 1A, and an arc 3 is generated between the contacts. At this time, that is, at the time of the lowering operation of the movable conductor 2, since the piston 13 is fixed at a fixed position,
The piston 13 projects from the cylindrical interior 2B including the movable contact 2A due to the lowering operation of the movable conductor 2,
Thereby, the granular insulator 5 in the cylindrical interior 2 </ b> B is released to the arc 3. Therefore, the arc 3 is cooled by the discharged granular insulator 5, and the same effect as in the first and second embodiments can be obtained. Further, according to the seventeenth embodiment, the nozzle 4 in the above-described embodiment is used.
In addition, since the nozzle system driving device 6 can be omitted, there is an effect that the structure of the switch is simplified.

[0069]

As is evident from the foregoing description, according to the first aspect of the invention, the granular insulators in blowing pressure of the gas against the arc generated between the fixed contact and the movable contact upon current interruption is the A
Since so as to enter the over-click, the arc from the interior
Simultaneous cooling with granular insulation and blowing gas from the outer periphery
And thus the arc cooling efficiency is further reduced.
There is an effect that a switch having an improved layer and excellent current interruption performance is selected.

[0070]

According to the second aspect of the present invention, the granular insulator incident on the arc is recovered, and the recovered granular insulator is repeatedly incident on the arc. The effect is that the amount can be reduced and the use efficiency is improved.

According to the third aspect of the present invention, since a granular insulator containing negative atoms is used, electrons in the arc are captured by the negative atoms that are decomposed and released from the granular insulator by arc heat, There is an effect that the current interruption performance is enhanced.

According to the fourth aspect of the present invention, since the granular insulating material is composed of plate-like particles, the specific surface area of the granular insulating material is increased, so that the arc is effectively cooled and the switching with high current interrupting performance is achieved. There is an effect that a vessel can be obtained.

According to the fifth aspect of the present invention, since the granular insulator is guided to the arc generating region and the insulator ejection guide for facilitating the stay of the arc is provided, the granular insulator hits the arc. The probability is increased, and therefore, there is an effect that the arc is effectively cooled and the current interruption performance is improved.

According to the sixth aspect of the present invention, the fixed conductor including the fixed contact is formed in a cylindrical shape, and the granular insulator is blown from the inside of the cylindrical shape to the arc, so that the granular insulator hits the arc. The arc is effectively cooled, the current interruption performance is improved, and a complicated mechanism dedicated to arc spraying is not particularly required, so that the switch configuration is simplified. is there.

[0076] According to the invention of claim 7, the movable conductor including the movable contact is formed in a cylindrical shape, since the internal its cylindrical shape as granular insulators is blown to the arc, in the case of the claims 6 Similar effects can be obtained.

According to the eighth aspect of the present invention, since the granular insulator is blown to the arc before the movable contact is almost fully opened, the use of the granular insulator is eliminated, and the use of the granular insulator can be effectively achieved. The effect is that the amount is reduced.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a switch according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional view of the arc in FIG. 2;

FIG. 4 is an enlarged view showing one particle of a granular insulator that is the arc cooling medium of FIG. 3;

FIG. 5 is a sectional view of a switch according to Embodiment 2 of the present invention.

FIG. 6 is an operation explanatory diagram of FIG. 5;

FIG. 7 is a sectional view of a switch according to a third embodiment corresponding to the invention of claim 3;

FIG. 8 is a sectional view of a switch according to Embodiment 4 of the present invention.

FIG. 9 is a circuit diagram of a switch according to Embodiment 5 of the present invention.

FIG. 10 is a circuit diagram of a switch according to Embodiment 6 of the present invention.

FIG. 11 is an enlarged view showing one particle of a granular insulator according to a seventh embodiment of the present invention.

FIG. 12 is a perspective view showing a granular insulator according to Embodiment 8 of the present invention.

FIG. 13 is a perspective view showing a granular insulator according to Embodiment 9 of the present invention.

FIG. 14 is a shape diagram of a granular insulator according to Embodiment 10 of the present invention.

FIG. 15 is a perspective view of a granular insulator according to Embodiment 11 corresponding to the invention of claim 5;

FIG. 16 is a schematic configuration diagram showing a main part of a switch according to Embodiment 12 of the present invention;

FIG. 17 is a schematic configuration diagram illustrating a main part of a switch according to Embodiment 13 of the present invention;

FIG. 18 is a sectional view of a main part of a switch according to Embodiment 14 of the present invention;

FIG. 19 is a sectional view of a switch according to a fifteenth embodiment corresponding to the seventh and eighth aspects of the present invention.

FIG. 20 is a sectional view of a switch according to a sixteenth embodiment corresponding to the ninth invention;

FIG. 21 is a sectional view of a switch according to a seventeenth embodiment corresponding to the ninth invention;

FIG. 22 is an enlarged sectional view taken along line BB of FIG. 21.

FIG. 23 is an operation explanatory diagram of FIG. 21;

FIG. 24 is a schematic side view showing a conventional switch.

25 is a sectional view taken along line CC of FIG. 24.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed conductor 1A Fixed contact 1B Cylindrical interior 2 Movable conductor 2A Movable contact 2B Cylindrical interior 3 Arc 5 Particulate insulator 21 Particulate insulator recovery means 23 Compressed gas (sprayed gas) 30 Insulator injection guide

Claims (8)

(57) [Claims] A fixed conductor having a fixed contact; and a movable conductor having a movable contact that can be brought into contact with and separated from the fixed contact,
In a switch that extinguishes the arc by blowing a gas to an arc generated between the fixed contact and the movable contact when current is interrupted when the fixed contact and the movable contact are separated, the granular insulator is incident on the arc by the blowing pressure of the gas. A switch characterized in that it is made to do. Wherein said the granular insulators was recovered enters the arc, switch of claim 1 Symbol mounting the collected granular insulators, characterized in that so as to repeatedly incident on the arc. 3. A switch according to claim 1 or claim 2, wherein the using those containing electronegative atom as the granular insulators. Wherein said granular insulators are switchgear according to any one of claims 1-3, characterized in that it consists of plate-like particles. Wherein directing the granular insulators to the arc generating area, and the opening and closing of any one of claims 1-4, wherein an insulating material injection guide to facilitate stay the arc is provided vessel. 6. is formed on the stationary conductor is tubular with fixed contacts, any one of claim 1 to 5, characterized in that the granular insulators from inside the tubular has to be blown to the arc Switch as described. 7. A movable conductor including the movable contact is formed into a cylindrical shape, any one of claims 1-5, characterized in that the granular insulators from inside the tubular has to be blown to the arc Switch. 8. The switch of any one of claims 1-7, characterized in that the blown arc said granular insulators before said movable contact is substantially fully open.