JP2000164083A - Vacuum valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum valve exerting excellent shutoff performance free of local concentration of arcs generated on a ring-shaped contact and allowing arcs to remain inside the electrodes to result in extinction when the arcs are rotated on the runner face of the ring-shaped contact by the magnetic field directed at a right angle. SOLUTION: On the inside of a vacuum vessel, a stationary electrode and a movable electrode are installed opposingly capable of contacting and separating with/from each other, each 2 being composed of a cylindrical portion 22 and a bottom surface 23, and a slit 4 is formed in at least one of the cylindrical portion 22 and bottom surface 23, and a ring-shaped contact 1 is fixed to the cylindrical portion 22 so that an intended vacuum valve is accomplished, wherein the condition (1/4)D1<=D2<=D1 should be met, where D1 signifies the inner diameter of the cylindrical portion, and D2, the inner diameter of the contact 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum valve and, more particularly, to a vacuum valve having an improved electrode structure to achieve excellent shut-off performance.

[0002]

2. Description of the Related Art A vacuum valve utilizing the excellent dielectric strength of a vacuum is required to be able to reduce the distance between electrodes and to be smaller in size than those using other insulating media, for example, SF6 gas circuit breakers. Has been widely spread. Vacuum valves with such contacts which move relative to one another and whose contact carrier is formed as a cylinder are known.

FIG. 12 is a sectional view showing a general structure of a vacuum valve 20 of this type.

[0004] In FIG. 12, inside a vacuum vessel 21,
The fixed electrode portion 11 and the movable electrode portion 12 which are provided so as to be able to freely contact and separate from each other are supported by the shaft 5.

The bellows 32 can move the movable electrode section 12 to adjust the distance between the fixed electrode section 11 and the electrode. The shield 31 is provided to protect the vacuum vessel 21 and the bellows 32 from the impact of an arc or the like.

Meanwhile, the vacuum valve 20 can improve the shut-off performance by improving the electrode structure. In order to improve the shut-off performance of the vacuum valve 20, it is necessary to suppress local heating of the electrode by an arc generated between the fixed electrode unit 11 and the movable electrode unit 12. That is, by suppressing the generation of abnormal metal vapor due to local heating of the electrode due to the arc, the breaking performance can be improved.

As an electrode structure for this purpose, a structure is generally used in which a magnetic field is used to apply a force to an arc generated between the electrode portions when current is interrupted. As one method of applying a magnetic field, there is a method of applying a magnetic field perpendicular to an arc generated between the electrode portions.

It is known that this magnetic field causes the arc to rotate, thereby suppressing local heating at the contact points of the electrodes and reducing damage to the electrodes. The arc moves on the arc running surfaces during rotation, these running surfaces forming the contact surfaces of the contacts.

FIG. 13 is a view showing the structure of the electrode section 10 for realizing the above principle. FIG. 13 (a)
FIG. 13 is a plan view of the electrode unit 10 viewed from the direction of the contact 1, and FIG. 13B is a side view of the electrode unit 10.

As shown in FIG. 13, the electrode section 10 comprises a ring-shaped contact 1, an electrode 2, and a shaft 5 supporting them. A slit 4 is cut in the electrode 2.

At the time of current interruption, a pair of facing electrode portions 10
Is opened, an arc is generated in the ring-shaped contact 1.

This arc is driven in the circumferential direction of the ring-shaped contact 1 by a magnetic field perpendicular to the arc. At the zero point of the alternating current, the arc is more diffused than metal particles or charged particles generated from the ring-shaped contact 1. The number that disappears due to adsorption increases, and the arc extinguishes naturally.

Thereafter, if the withstand voltage between the ring-shaped contacts 1 with respect to the re-motive voltage generated between the pair of opposed ring-shaped contacts 1 is high, the interruption is completed. As a result, excessive heat input locally generated to the ring-shaped contact 1 can be prevented, and an electrode structure having excellent blocking performance can be obtained.

[0014]

However, in the above-described method of applying a magnetic field perpendicular to the arc generated between the electrode portions 10, the arc is fired at the outer peripheral portion of the ring-shaped contact 1. If the arc is
When the vehicle starts running on the ring-shaped contact 1 as the contact surface, an arc may extend outward from the electrode 2 and the breaking performance may become unstable.

[0015] Alternatively, there is a problem that the arc stagnates at that portion, causing local heating of the ring-shaped contact 1, releasing a large amount of metal vapor and causing a failure in breaking.

The present invention has been made in view of such circumstances, and an arc generated on a ring-shaped contact does not concentrate on a part, and the arc rotates a running surface of the ring-shaped contact by a magnetic field in a perpendicular direction. An object of the present invention is to provide a vacuum valve which is capable of causing arc extinction due to accumulation of an arc in an electrode at times, thereby achieving excellent shutoff performance.

[0017]

Means for Solving the Problems In order to achieve the above object, the present invention takes the following measures. That is, according to the first aspect of the present invention, the fixed electrode and the movable electrode are disposed inside the vacuum vessel so as to be able to freely contact and separate from each other, and each of the electrodes is composed of a cylindrical portion and a bottom portion. In a vacuum valve having a slit in at least one of the above and a ring-shaped contact fixed to the cylindrical portion, the inner diameter D2 of the contact and the inner diameter D1 of the cylindrical portion are: (1/4) D1 ≦ D2 ≦ D1 Try to satisfy the following relationship:

Therefore, in the vacuum valve according to the first aspect of the present invention, a sufficient radial area in which the arc is rotated by the magnetic field can be ensured, and a current density required at the time of current interruption can be ensured. Also, a magnetic field in a perpendicular direction required for the rotation of the arc can be obtained, so that excessive heat input locally occurring to the electrode can be prevented.
As a result, damage to the ring-shaped contact can be reduced, and a vacuum valve having excellent shutoff performance can be realized.

According to the second aspect of the present invention, inside the vacuum vessel,
The fixed electrode and the movable electrode are disposed so as to be able to freely contact and separate from each other. In this case, the inner diameter D1 of the cylindrical portion and the outer diameter D3 of the cylindrical portion satisfy the relationship of (1/5) D3 ≦ D1 ≦ (4/5) D3.

Therefore, in the vacuum valve according to the second aspect of the present invention, a sufficient area can be secured when the arc rotates by the magnetic field, and a necessary area can be secured when the current is interrupted. As a result, the arc is not concentrated on a part, damage to the contacts is suppressed, and a vacuum valve with excellent breaking efficiency can be realized.

According to the third aspect of the present invention, inside the vacuum vessel,
The fixed electrode and the movable electrode are disposed so as to be able to freely contact and separate from each other. A ring-shaped reinforcing member is provided inside the cylindrical portion, and the inner diameter D4 of the reinforcing member and the inner diameter D2 of the contact satisfy the relationship of D2 <D4.

Therefore, in the vacuum valve according to the third aspect of the present invention, mechanical deformation due to the impact of the injection of the electrodes and the like can be suppressed, and the occurrence of an arc generated between the opposing electrodes when the current is interrupted can be prevented. As a result, the mechanical life of the electrode can be prolonged, and a vacuum valve having excellent shutoff performance can be realized.

According to a fourth aspect of the present invention, there is provided the vacuum valve according to the third aspect of the present invention, wherein the reinforcing material contains at least a magnetic material.

Therefore, in the vacuum valve according to the fourth aspect of the present invention, the arc does not extend outward from the electrode portion. As a result, a vacuum valve having excellent shutoff performance can be realized.

According to the fifth aspect of the present invention, inside the vacuum vessel,
The fixed electrode and the movable electrode are disposed so as to be able to freely contact and separate from each other. In the vacuum valve in which the contact is fixed, the fixing portion between the cylindrical portion and the contact occupies a part of the cross section of the cylindrical portion and the contact.

Therefore, in the vacuum valve according to the fifth aspect of the present invention, the arc does not extend outward from the electrode portion. Further, the required perpendicular magnetic field can be stably supplied by the slit. As a result, a vacuum valve having excellent shutoff performance can be realized.

According to a sixth aspect of the present invention, the fixed portion between the cylindrical portion and the contact point is located at a position closer to the center of the cylindrical portion than at least a substantially central position between the inner diameter and the outer diameter of the cylindrical portion. A vacuum valve according to a fifth aspect of the present invention.

Therefore, in the vacuum valve according to the present invention, the arc does not extend outward from the electrode portion. Further, a required perpendicular magnetic field can be supplied stably. As a result, a vacuum valve having excellent shutoff performance can be realized.

According to a seventh aspect of the present invention, in the vacuum valve according to the sixth aspect of the invention, a projection is provided on the cylindrical portion,
The contact is provided with a concave portion that fits with the protrusion, and the cylindrical portion and the contact are joined by fitting the protrusion and the concave.

Therefore, in the vacuum valve according to the present invention, the arc does not extend outward from the electrode portion. Further, a required perpendicular magnetic field can be supplied stably. As a result, a vacuum valve having excellent shutoff performance can be realized.

According to an eighth aspect of the present invention, in the vacuum valve according to the sixth aspect of the present invention, a projection is provided on the contact, a recess is provided on the cylindrical portion for fitting the projection, and the projection is fitted on the recess. Thereby, a cylindrical part and a contact point are joined.

Therefore, in the vacuum valve according to the present invention, the arc does not extend outward from the electrode portion. Further, a required perpendicular magnetic field can be supplied stably. As a result, a vacuum valve having excellent shutoff performance can be realized.

According to the ninth aspect of the present invention, the inside of the vacuum vessel is
The fixed electrode and the movable electrode are disposed so as to be able to freely contact and separate from each other. In the vacuum valve in which the contact is fixed, the height of the contact at the center of the cylinder is made higher than the height of the outer periphery of the cylinder.

Therefore, in the vacuum valve according to the ninth aspect, the arc does not extend outward from the electrode portion. Further, a required perpendicular magnetic field can be supplied stably. As a result, a vacuum valve having excellent shutoff performance can be realized.

According to the tenth aspect of the present invention, the fixed electrode and the movable electrode are opposed to each other inside the vacuum vessel so as to be able to freely contact and separate from each other.
Each electrode is composed of a cylindrical portion and a bottom portion, has a slit in at least one of the cylindrical portion or the bottom portion, and in a vacuum valve in which a ring-shaped contact is fixed to the cylindrical portion, the height of the contact And the inner diameter D1 of the cylindrical portion is set to satisfy the following relationship: D1> D7.

Therefore, in the vacuum valve according to the tenth aspect, the arc does not extend outward from the electrode portion. Further, a required perpendicular magnetic field can be supplied stably. As a result, a vacuum valve having excellent shutoff performance can be realized.

According to the eleventh aspect of the present invention, the fixed electrode and the movable electrode are provided inside the vacuum vessel so as to be able to freely contact and separate from each other.
Each electrode is composed of a cylindrical part and a bottom part, and has a slit in at least the bottom part of the cylindrical part or the bottom part, and is cut into electrodes in a vacuum valve in which a ring-shaped contact is fixed to the cylindrical part. The cut slit is cut to the bottom of the bottom, and the shortest distance r between the bottom of the cut slit and the center of the cylinder and the outer diameter D3 of the cylinder are: (1/4) D3 ≦ r < (1/2) D3.

Therefore, in the vacuum valve according to the eleventh aspect, it is possible to control the arc at the end of the electrode. As a result, a vacuum valve having excellent shutoff performance can be realized. Further, it is possible to realize a vacuum valve that can prevent mechanical deformation due to an impact of input of the electrode portion or the like.

According to the twelfth aspect of the invention, the contact is C
u or Ag, Co, Cr, Ti, Nb, F
12. The invention according to any one of claims 1 to 11, characterized in that it is formed of an alloy containing at least one of e, Mo, W or a compound thereof and having a total of 20 to 70% by weight. Use a vacuum valve.

Therefore, in the vacuum valve according to the twelfth aspect of the present invention, by containing such a material, melting of the contact at the time of interrupting a large current is suppressed. As a result, a vacuum valve having excellent durability can be realized.

According to a thirteenth aspect of the present invention, there is provided the vacuum valve according to any one of the first to eleventh aspects, wherein the contact contains a compound containing carbon or boron.

Therefore, in the vacuum valve according to the thirteenth aspect of the present invention, by containing such a material, melting of the contact at the time of interrupting a large current is suppressed. As a result, a vacuum valve having excellent durability can be realized.

According to the fourteenth aspect of the present invention, the contact is B
12. The method according to claim 1, wherein at least one of i, Te, Se, and Sb is contained.
The invention is a vacuum valve according to the invention.

Therefore, in the vacuum valve according to the fourteenth aspect of the present invention, by containing such a material, the melting of the contact when a large current is interrupted is suppressed. As a result, a vacuum valve having excellent durability can be realized.

[0045]

Embodiments of the present invention will be described below with reference to the drawings.

Since the general configuration of the vacuum valve 20 has already been described with reference to FIG. 12, the description is omitted here.

(First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. 1, 9, and 12. FIG.

FIG. 1A is a cross-sectional view of the electrode section 10, and shows the fixed electrode section 11 and the movable electrode section 12 of FIG. 12 in an enlarged manner.

FIG. 1B is a sectional view of the electrode 2 constituting the electrode section 10.

As shown in FIG. 1A, the electrode section 10
A ring-shaped contact 1 is connected to an electrode 2, and a shaft 5
It is fixed to. The electrode 2 is composed of an electrode cylindrical portion 22 and an electrode bottom portion 23 as shown in FIG.

Here, in the present embodiment,
Inner diameter D2 of ring-shaped contact 1 and inner diameter D1 of electrode cylindrical portion 22
And (1/4) D1 ≦ D2 ≦ D1.

Next, the operation of the vacuum valve of the present embodiment having the electrode portion 10 configured as described above will be described.

In FIG. 12, when the current is cut off,
When the electrodes 12 and 12 are separated, a vacuum arc is generated between the ring-shaped contacts 1 on the opposing electrode portions.

As shown in FIG. 1, a slit 4 cut into the electrode 2 generates a magnetic field perpendicular to the arc. Therefore, the Lorentzka acting on the self-current flowing through the arc by the magnetic field drives the arc generated between the opposed ring-shaped contacts 1 when the current is interrupted.

Accordingly, the arc starts rotating on the ring-shaped contact 1 due to the magnetic field in the direction perpendicular to the arc generated by the slit 4.

In this case, since the inner diameter D2 of the ring-shaped contact 1 and the inner diameter D1 of the electrode cylindrical portion 22 satisfy the relationship of (1/4) D1 ≦ D2 ≦ D1, the rotation of the arc by the magnetic field is achieved. Since a sufficient radial area can be ensured, a current density required at the time of current interruption can be ensured. Also,
Since the perpendicular magnetic field required for arc rotation can also be obtained,
Excessive heat input locally generated in the ring-shaped contact 1 and the electrode 2 can be prevented. Therefore, damage to the ring-shaped contact 1 is small, and the breaking performance can be improved.

This could be confirmed experimentally as shown in FIG. A large interrupting current value indicates that the interrupting performance is excellent.

FIG. 9 shows a value (D2 / D1) obtained by standardizing the inner diameter D2 of the ring-shaped contact 1 with the inner diameter D1 of the electrode cylindrical portion 22.
FIG. 4 is a diagram showing a relationship between the current and a breaking current value.

The breaking current value is a relative value, and the relationship between the inner diameter D2 of the ring-shaped contact 1 and the inner diameter D1 of the electrode cylindrical portion 22 is set to 1 when D2 = D1.

As described above, in the vacuum valve of the present embodiment, the inner diameter D1 of the electrode cylindrical portion 22 and the inner diameter D2 of the ring-shaped contact 1 have a relationship of (1/4) D1 ≦ D2 ≦ D1. As a result, the breaking current value increases, and good breaking performance can be realized.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS.

Since FIG. 1 has already been described in the first embodiment, the description thereof is omitted here.

That is, in the present embodiment, FIG.
The outer diameter D3 of the electrode cylindrical portion 22 and the inner diameter D1 of the electrode cylindrical portion 22 satisfy the following relationship: (1/5) D3 ≦ D1 ≦ (4/5) D3.

Next, the operation of the vacuum valve of the present embodiment having the electrode portion 10 configured as described above will be described.

The outer diameter D3 of the electrode cylindrical portion 22 and the electrode cylindrical portion 2
2 satisfies the relationship of (1/5) D3 ≦ D1 ≦ (4/5) D3, so that the rotation of the arc by the magnetic field can be performed in the same manner as in the first embodiment. At times, a necessary area can be sufficiently secured, and a necessary area at the time of current interruption can be secured.

Therefore, the arc is not concentrated on a part, the thermal damage to the ring-shaped contact 1 is suppressed, and excellent breaking efficiency is obtained. This was confirmed experimentally as shown in FIG.

FIG. 10 shows a value (D1 / D3) obtained by standardizing the inner diameter D1 of the electrode cylindrical portion 22 by the outer diameter D3 of the electrode cylindrical portion 22.
FIG. 4 is a diagram showing a relationship between the value and a breaking current value.

Note that the breaking current value is a relative value, and the relationship between the inner diameter D2 of the ring-shaped contact 1 and the inner diameter D1 of the electrode cylindrical portion is such that the breaking current value when D2 = D1 is 1.

As described above, in the vacuum valve of the present embodiment, D1 and D3 are set to satisfy the relationship of (1/5) D3 ≦ D1 ≦ (4/5) D3. As a result, the breaking current value increases, and good breaking performance can be realized.

(Third Embodiment) A third embodiment of the present invention will be described with reference to FIG.

FIG. 2 is a cross-sectional view of the electrode section 10, and FIG.
2 is an enlarged view of a fixed electrode section 11 and a movable electrode section 12.

FIG. 2A is a cross-sectional view of the electrode section 10, and shows the fixed electrode section 11 and the movable electrode section 12 of FIG. 12 in an enlarged manner.

FIG. 2B is a cross-sectional view of the electrode 2 constituting the electrode section 10.

That is, as shown in FIG.
1 is different from the configuration in FIG. 1 only in that a ring-shaped reinforcing member 3 is provided inside the electrode cylindrical portion 22.

In the present embodiment, the inner diameter D4 of the reinforcing member 3 and the inner diameter D2 of the ring-shaped contact 1 satisfy the relationship of D2 <D4.

Next, the operation of the vacuum valve of the present embodiment having the electrode portion 10 configured as described above will be described.

By providing the ring-shaped reinforcing member 3 inside the electrode cylindrical portion 22, mechanical deformation of the electrode 2 due to the impact of the injection of the electrode portion 10 is suppressed. Further, at the time of current interruption, an arc generated between the opposed electrode portions 10 is
A stiffener 3 is always behind the ring contact 1. this is,
The structure is such that an arc is prevented from being emitted to the reinforcing member 3. As a result, the shutoff performance of the vacuum valve can be improved.

As described above, in the vacuum valve according to the present embodiment, the mechanical life of the electrode 2 can be extended, and good shut-off performance can be realized.

(Fourth Embodiment) A fourth embodiment of the present invention will be described with reference to FIG.

Since FIG. 2 has already been described in the third embodiment, description thereof will be omitted here.

That is, in the present embodiment, FIG.
The ring-shaped reinforcing member 3 shown in (1) contains at least a magnetic substance.

Next, the operation of the vacuum valve of the present embodiment having the electrode portion 10 configured as described above will be described.

Since the ring-shaped reinforcing member 3 contains a magnetic material, a magnetic flux can be generated in a direction parallel to the axis 5. As a result, a magnetic field in a direction perpendicular to the arc by the slit 4 can be applied. Further, the arc firing point at the time of current interruption is always the inner end of the ring-shaped contact 1.

As a result, the arc does not extend outward from the electrode portion 10, so that good breaking performance can be obtained.

The magnetic material does not have to have a particularly strong magnetic force. For example, a magnetic material having a very weak magnetic force, such as stainless steel, exhibits the effect.

As described above, since the ring-shaped reinforcing member 3 contains a magnetic material, a vacuum valve having good shut-off performance can be obtained.

As described above, in the vacuum valve according to the present embodiment, since the ring-shaped reinforcing member 3 contains a magnetic material, good shut-off performance can be realized.

(Fifth Embodiment) A fifth embodiment of the present invention will be described with reference to FIG. 1B and FIG.

Since FIG. 1B has already been described in the first embodiment, the description is omitted here.

FIG. 3 is a cross-sectional view of the electrode section 10, and FIG.
2 is an enlarged view of a fixed electrode section 11 and a movable electrode section 12.

That is, the electrode 2 in the present embodiment
The electrode cylindrical portion 22 and the ring-shaped contact 1 are joined and fixed by a fixing portion 6, and the fixing portion 6 is fixed to the electrode cylindrical portion 2.
2 and a part of the cross section of the ring-shaped contact 1.

Note that, for other configurations, FIG.
Since it is the same as that shown in (a), the description is omitted here.

Next, the operation of the vacuum valve of the present embodiment having the electrode portion 10 configured as described above will be described.

According to the above configuration, even if the arc igniting point at the time of current interruption is at the inner end of the ring-shaped contact 1 or not at the inner end of the ring-shaped contact 1, the arc can be applied to the electrode. It will stay inside the part 10.

Therefore, the arc does not extend outward from the electrode portion 10. Further, the slits 4 can stably supply a required perpendicular magnetic field. Therefore, good blocking performance can be obtained.

As described above, in the vacuum valve of the present embodiment, good shut-off performance can be realized.

(Sixth Embodiment) A sixth embodiment of the present invention will be described with reference to FIGS.

Since FIG. 1B has already been described in the first embodiment, the description is omitted here.

FIG. 4 is a cross-sectional view of the electrode section 10, and FIG.
2 is an enlarged view of a fixed electrode section 11 and a movable electrode section 12.

That is, the electrode 2 in the present embodiment
The electrode cylindrical portion 22 and the ring-shaped contact 1 are joined and fixed by a fixing portion 6, and the fixing portion 6 is fixed to the electrode cylindrical portion 2.
Up to the point that a part of the cross section of the ring-shaped contact 1 and the ring-shaped contact 1 is occupied, the configuration is the same as that of FIG. 3 described in the fifth embodiment. 22 is disposed closer to the center of the cylindrical portion than the center position 61 between the inner and outer diameters.

Next, the operation of the vacuum valve of the present embodiment having the electrode portion 10 configured as described above will be described.

With such an electrode configuration, the arc igniting point at the time of current interruption is the inner end of the ring-shaped contact 1, or the arc remains inside the electrode section 10 even if it does not. Thereby, the arc firing point at the time of current interruption is always the inner end of the ring-shaped contact 1. Therefore, the arc does not extend outward from the electrode portion 10.

Further, since the required magnetic field in the perpendicular direction can be stably supplied by the slit 4, a good shut-off performance can be obtained.

Since the fixing portion 6 is disposed closer to the center of the cylindrical portion than the center position 61 between the inner and outer diameters of the electrode cylindrical portion 22, the above-described effects are more excellent than in the fifth embodiment. Can be realized.

As described above, in the vacuum valve according to the present embodiment, good shutoff performance can be realized.

(Seventh Embodiment) A seventh embodiment of the present invention will be described with reference to FIG. 1B and FIG.

Since FIG. 1B has already been described in the first embodiment, the description is omitted here.

FIG. 5 is a cross-sectional view of the electrode section 10, and FIG.
2 is an enlarged view of a fixed electrode section 11 and a movable electrode section 12.

That is, the electrode 2 in the present embodiment
Provides the electrode projection 7 on the electrode cylindrical portion 22,
A concave portion is provided on the ring-shaped contact 1 to be fitted with the projection 7;
The electrode 22 and the ring-shaped contact 1 are joined by fitting the protrusion 7 and the recess. At this time, the fixing portion 6 is arranged at least closer to the center of the cylindrical portion than the center position 61 between the inner diameter and the outer diameter of the electrode cylindrical portion 22.

The other configuration is the same as that shown in FIG. 1A, and the description thereof will be omitted.

The vacuum valve of the present embodiment provided with the electrode portion 10 configured as described above can also achieve the same operation as that of the above-described sixth embodiment.

As described above, also in the vacuum valve of the present embodiment, good shutoff performance can be realized.

(Eighth Embodiment) An eighth embodiment of the present invention will be described with reference to FIGS.

Since FIG. 1B has already been described in the first embodiment, the description is omitted here.

FIG. 6 is a cross-sectional view of the electrode section 10, and FIG.
2 is an enlarged view of a fixed electrode section 11 and a movable electrode section 12.

That is, the electrode section 1 in the present embodiment
Reference numeral 0 denotes that the contact protrusion 8 is provided on the ring-shaped contact 1, a concave portion is provided on the electrode cylindrical portion 22 so as to be fitted with the protrusion 8, and the protrusion 8 is fitted with the concave portion.

The other structure is the same as that shown in FIG. 1A, and the description thereof will be omitted.

Thus, the electrode cylindrical portion 22 and the ring-shaped contact 1 are joined only by the projection 8 and the fixed portion 6
Are arranged at least closer to the center of the cylindrical portion than the center position 61 between the inner and outer diameters of the electrode cylindrical portion 22.

The vacuum valve of the present embodiment provided with the electrode portion 10 configured as described above can also achieve the same operation as the above-described sixth embodiment.

As described above, also in the vacuum valve of the present embodiment, good shut-off performance can be realized.

(Ninth Embodiment) A ninth embodiment of the present invention will be described with reference to FIGS.

Since FIG. 1B has already been described in the first embodiment, the description is omitted here.

FIG. 7 is a cross-sectional view of the electrode section 10, and FIG.
2 is an enlarged view of a fixed electrode section 11 and a movable electrode section 12.

That is, the electrode section 1 in the present embodiment is
0, as shown in FIG. 7, the height h2 of the ring-shaped contact 1 on the center side of the cylinder is higher than the height h1 on the outer periphery of the cylinder. D7 is the inner diameter D7 at the position where the height of the ring-shaped contact 1 is maximum.

The other configuration is the same as that shown in FIG. 1A, and the description thereof will be omitted.

Next, the operation of the vacuum valve of the present embodiment having the electrode portion 10 configured as described above will be described.

With such a configuration, the arc firing point at the time of current interruption is always at the inner end of the ring-shaped contact 1, and the arc does not extend outward from the electrode portion 10.

As described above, also in the vacuum valve of the present embodiment, good shut-off performance can be realized.

(Tenth Embodiment) A tenth embodiment of the present invention will be described with reference to FIG.

FIG. 7 has already been described in the ninth embodiment, and a description thereof will be omitted.

That is, in the present embodiment, the relationship between the inner diameter D7 at the position where the height of the ring-shaped contact 1 is maximum and the inner diameter D1 of the electrode cylindrical portion 22 satisfies the relationship of D1> D7. I have.

Next, the operation of the vacuum valve of the present embodiment having the electrode portion 10 configured as described above will be described.

According to this configuration, the arc igniting point at the time of current interruption is always located at the inner end of the ring-shaped contact 1.
The arc does not extend outward from the wire.

As described above, also in the vacuum valve of the present embodiment, good shut-off performance can be realized.

(Eleventh Embodiment) An eleventh embodiment of the present invention will be described with reference to FIGS. 1, 8, and 11. FIG.

Since FIG. 1 has already been described in the first embodiment, a description thereof will be omitted here.

FIG. 8 is a plan view of the electrode 2 as viewed from the shaft 5 side.

That is, in the present embodiment, FIG.
The slit 4 cut into the electrode 2 is cut to the lower end of the electrode bottom 23 as shown in FIG.

Further, as shown in FIG.
Outer diameter D3 and the electrode bottom 2 of the slit 4
3, the shortest distance r from the center 41 of the cylinder is set to satisfy the following relationship: (1/4) D3 ≦ r <(1/2) D3.

Next, the operation of the vacuum valve of the present embodiment having the electrode portion 10 configured as described above will be described.

According to this configuration, the required perpendicular magnetic field can be supplied stably by the slits 4 provided in the electrode bottom portion 23 and the current paths formed by the slits 4. Further, it is possible to prevent mechanical deformation of the electrode 2 due to the impact of the application of the electrode portion 10 or the like.

Further, the movement of the arc at the end of the electrode unit 10 is facilitated, and it is possible to control the arc to rotate at the end of the electrode unit 10. Therefore, it has become possible to improve the breaking performance.

This could be confirmed experimentally as shown in FIG. A large interrupting current value indicates that the interrupting performance is excellent.

FIG. 11 shows a value (r / D3) obtained by standardizing the shortest distance r of the cut slit 4 from the center 41 of the cylinder at the electrode bottom 23 to the outer diameter D3 of the electrode cylinder 22.
FIG. 4 is a diagram showing a relationship between the current and a breaking current value.

That is, in the present embodiment, the shortest distance r of the cut slit 4 from the cylindrical center 41 at the electrode bottom portion 23 and the outer diameter D3 of the electrode cylindrical portion 22 are represented by (1/4) By satisfying the relationship of D3 ≦ r <(1/2) D3, a breaking current value is increased, and a vacuum valve having good breaking performance is obtained.

As described above, by using the electrode described in this embodiment, a vacuum valve having good shut-off performance can be obtained.

(Twelfth Embodiment) A twelfth embodiment of the present invention will be described with reference to FIG.

Since FIG. 1A has already been described in the first embodiment, the description is omitted here.

That is, in the present embodiment, the ring-shaped contact 1 contains Cu or Ag, and contains Co, Cr,
Containing at least one kind of Ti, Nb, Fe, Mo, W or a compound thereof, and having a total of 20 to 70% by weight
It is formed of an alloy that is

Here, a particularly preferable example is Cu-Cr.
There is.

Next, the operation of the vacuum valve of the present embodiment having the ring-shaped contact 1 configured as described above will be described.

The inclusion of these materials in the ring-shaped contact 1 suppresses melting at the time of interrupting a large current.

As described above, the vacuum valve according to the present embodiment can achieve excellent durability.

(Thirteenth Embodiment) A thirteenth embodiment of the present invention will be described with reference to FIG.

Since FIG. 1A has already been described in the first embodiment, the description is omitted here.

That is, in the present embodiment, the ring-shaped contact 1 contains a compound containing carbon or boron.

Here, a particularly preferable example is Ag-W-
There is C.

Next, the operation of the vacuum valve of the present embodiment having the ring-shaped contact 1 configured as described above will be described.

By including these materials in the ring-shaped contact 1, melting at the time of interrupting a large current is suppressed.

As described above, also in the vacuum valve of the present embodiment, excellent durability can be realized.

(Fourteenth Embodiment) A fourteenth embodiment of the present invention will be described with reference to FIG.

Since FIG. 1A has already been described in the first embodiment, the description is omitted here.

That is, in the present embodiment, the ring-shaped contact 1 contains at least one of Bi, Te, Se, and Sb.

Here, a particularly preferable example is Cu-Cr.
-Bi.

Next, the operation of the vacuum valve of the present embodiment having the ring-shaped contact 1 configured as described above will be described.

By containing these materials in the ring-shaped contact 1, melting at the time of interrupting a large current is suppressed.

As described above, also in the vacuum valve of the present embodiment, excellent durability can be realized.

[0168]

As described above, according to the vacuum valve of the present invention, the arc generated between the contact points of the electrodes does not concentrate on a part, and the arc rotates on the contact running surface by the magnetic field in the perpendicular direction. Then, the arc is accumulated in the electrode, and the arc can be extinguished. As a result, a vacuum valve having excellent shutoff performance can be realized.

Since a material suitable for suppressing melting at the time of interrupting a large current is used for the contact point of the electrode,
A vacuum valve with even more excellent durability can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration example of an electrode section in a vacuum valve according to first and second embodiments of the present invention.

FIG. 2 is a sectional view showing a configuration example of an electrode unit in a vacuum valve according to third and fourth embodiments of the present invention.

FIG. 3 is a sectional view showing a configuration example of an electrode section in a vacuum valve according to a fifth embodiment of the present invention.

FIG. 4 is a sectional view showing a configuration example of an electrode section in a vacuum valve according to a sixth embodiment of the present invention.

FIG. 5 is a sectional view showing a configuration example of an electrode unit in a vacuum valve according to a seventh embodiment of the present invention.

FIG. 6 is a sectional view showing a configuration example of an electrode section in a vacuum valve according to an eighth embodiment of the present invention.

FIG. 7 is a sectional view showing a configuration example of an electrode section in a vacuum valve according to ninth and tenth embodiments of the present invention.

FIG. 8 is a plan view showing a configuration example of an electrode section in a vacuum valve according to an eleventh embodiment of the present invention.

FIG. 9 is a diagram showing the relationship between (ring inner diameter D2) / (electrode inner diameter D1) and a breaking current value.

FIG. 10 is a diagram showing a relationship between (electrode cylindrical portion inner diameter D1) / (electrode cylindrical portion outer diameter D3) and a breaking current value.

FIG. 11 is a diagram showing the relationship between (the shortest distance r between the lower end of the electrode bottom of the slit and the center of the cylinder) / (electrode outer diameter D3 of the electrode cylinder) and the breaking current value.

FIG. 12 is a sectional view showing a basic configuration example of a vacuum valve.

FIG. 13 is a diagram showing a configuration example of an electrode unit in a conventional vacuum valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Ring-shaped contact 2 ... Electrode 3 ... Reinforcement 4 ... Slit 5 ... Shaft 6 ... Fixing part of electrode and contact 7 ... Electrode protrusion 8 ... Contact Projection part 10 ... Electrode part 11 ... Fixed electrode part 12 ... Movable electrode part 20 ... Vacuum valve 21 ... Vacuum container 22 ... Electrode cylindrical part 23 ... Electrode bottom part 31 ..Shield 32: Bellows 41: Center of cylinder at electrode bottom 61: Center position of inner and outer diameter of electrode cylinder

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hiromichi Somei 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Toshiba Fuchu Plant, Inc. Terms (reference) 5G026 BA03 DA07 DB02 5G051 AA05

Claims (14)

[Claims] 1. A fixed electrode and a movable electrode are disposed inside a vacuum vessel so as to be able to freely contact and separate from each other, and each of the electrodes is composed of a cylindrical portion and a bottom portion. In a vacuum valve having at least one of the slits and a ring-shaped contact fixed to the cylindrical portion, an inner diameter D2 of the contact and an inner diameter D1 of the cylindrical portion are represented by: (1/4) D1 ≦ D2 A vacuum valve characterized by satisfying a relationship of ≦ D1. 2. A fixed electrode and a movable electrode are provided inside a vacuum vessel so as to be able to freely contact and separate from each other, and each of the electrodes is composed of a cylindrical portion and a bottom portion. In a vacuum valve having at least one of the slits and a ring-shaped contact fixed to the cylindrical portion, an inner diameter D1 of the cylindrical portion and an outer diameter D3 of the cylindrical portion are represented by: (1/5) D3 ≤ D1 ≤ (4/5) D3 A vacuum valve characterized by satisfying the following relationship: 3. A fixed electrode and a movable electrode are provided inside a vacuum vessel so as to be able to freely contact and separate from each other, and each of the electrodes is composed of a cylindrical portion and a bottom portion. A vacuum valve having a slit on at least one side and a ring-shaped contact fixed to the cylindrical portion, wherein a ring-shaped reinforcing member is provided inside the cylindrical portion, and an inner diameter D4 of the reinforcing member; A vacuum valve, wherein an inner diameter D2 of a contact satisfies a relationship of D2 <D4. 4. The vacuum valve according to claim 3, wherein the reinforcing material contains at least a magnetic material. 5. A fixed electrode and a movable electrode are provided inside a vacuum vessel so as to be able to freely contact and separate from each other, and each of said electrodes is composed of a cylindrical portion and a bottom portion. In a vacuum valve having a slit on at least one side and a ring-shaped contact fixed to the cylindrical portion, a fixing portion between the cylindrical portion and the contact is a part of a cross section of the cylindrical portion and the contact. Vacuum valve characterized in that it occupies. 6. A fixing portion for fixing the cylindrical portion and the contact to a position closer to the center of the cylindrical portion than at least a substantially central position between an inner diameter and an outer diameter of the cylindrical portion. The vacuum valve according to claim 5, wherein 7. The vacuum valve according to claim 6, wherein
Along with providing the protrusion on the cylindrical portion, providing a recess for fitting the protrusion on the contact, and fitting the protrusion and the recess to join the cylindrical portion and the contact. A vacuum valve characterized by: 8. The vacuum valve according to claim 6, wherein
A protrusion is provided on the contact, and a recess is provided on the cylindrical portion to be fitted with the protrusion, and the cylindrical portion and the contact are joined by fitting the protrusion and the recess. A vacuum valve characterized by: 9. A fixed electrode and a movable electrode are disposed inside the vacuum vessel so as to be able to freely contact and separate from each other, and each of the electrodes is composed of a cylindrical portion and a bottom portion. In a vacuum valve having a slit on at least one side and a ring-shaped contact fixed to the cylindrical portion, the height of the contact at the center of the cylinder is made higher than the height of the outer periphery of the cylinder. And vacuum valve. 10. A fixed electrode and a movable electrode are provided inside a vacuum vessel so as to be able to freely contact and separate from each other, and each of the electrodes is composed of a cylindrical portion and a bottom portion. In a vacuum valve having at least one of the slits and a ring-shaped contact fixed to the cylindrical portion, an inner diameter D7 at a position where the height of the contact is maximum, and an inner diameter D1 of the cylindrical portion are: A vacuum valve characterized by satisfying a relationship of D1> D7. 11. A fixed electrode and a movable electrode are provided inside a vacuum vessel so as to be able to freely contact and separate from each other, and each of the electrodes comprises a cylindrical portion and a bottom portion, and at least the cylindrical portion or the bottom portion. In a vacuum valve having a bottom surface with a slit and a ring-shaped contact fixed to the cylindrical portion, a slit cut into the electrode is cut to a lower end of the bottom portion, and the cut slit is The shortest distance r between the lower end of the bottom surface and the center of the cylinder and the outer diameter D3 of the cylinder are such that the following relationship is satisfied: (1/4) D3 ≦ r <(1/2) D3. Vacuum valve to do. 12. The contact contains Cu or Ag, contains at least one of Co, Cr, Ti, Nb, Fe, Mo, W or a compound thereof, and has a total of 20 to 70% by weight. The vacuum valve according to any one of claims 1 to 11, wherein the vacuum valve is formed of a certain alloy. 13. The contact according to claim 1, wherein the contact contains a compound containing carbon or boron.
12. The vacuum valve according to any one of claims 11 to 11. 14. The contact may be Bi, Te, S
The vacuum valve according to any one of claims 1 to 11, further comprising at least one of e and Sb.