JP6745757B2 - Vacuum valve - Google Patents

Description

The present invention relates to a vacuum valve, and more particularly to a vacuum valve that suppresses a decrease in current interruption performance due to repeated current interruptions and improves the interruption life while maintaining the reinforcing effect of contacts.

A conventional vacuum valve uses an insulating cylinder made of alumina ceramics or the like as a vacuum container, and a metal flange is formed by vacuum brazing to keep the inside of the container airtight at high vacuum in the metallized layers generated at both ends of the insulating cylinder. It is fixed. A fixed side electrode rod and a movable side electrode rod are coaxially and oppositely attached to the metal flanges fixed to both ends of the insulating cylinder, and a fixed side contact and a movable side contact are respectively provided on the facing surfaces of each electrode rod. It is fixed.

Further, a bellows is provided between the movable side electrode rod and the metal flange so that the movable side contact can operate on the axis of the insulating container while maintaining airtightness. An umbrella-shaped bellows cover provided to prevent the bellows from being contaminated by the arc generated when the current is cut off is fixed to the movable electrode rod. The contact side of the bellows itself is brazed to the bellows cover or the bellows cover and the movable side electrode rod, and the opposite side of the contact is attached to the movable side flange. An arc shield is provided inside the insulating container so as to surround the opposing contacts, and prevents the inner surface of the insulating container from being contaminated by the arc generated when the current is cut off. On the movable side, a guide having a bearing function is attached to the movable side end portion so that the movable side smoothly operates on the axis in the process of opening and closing.

There is a wind turbine type contact as a kind of the above-mentioned contact (see Patent Document 1). As shown in FIG. 1 in this specification, a spiral groove 1 is cut from a central portion toward a peripheral portion to form a plurality of (four in FIG. 1) arc portions 2 in the wind turbine contact. doing. When the vacuum valve is closed and current is supplied, the arcuate portions 2 of the fixed side contact and the movable side contact are in contact with each other. When the current is cut off, the fixed side contact and the movable side contact are opened to generate an arc 3 at an arbitrary point on the arc portion 2 of the fixed side contact and the movable side contact.

The current Ix supplied to the wind turbine contact flows from the center along the shape of the arc portion 2 as shown in FIG. 1, and further flows to the opposing arc portion 2 of the wind turbine contact via the arc 3. At this time, the magnetic flux density Bx not shown in FIG. 1 is generated by the current Ix. The arc 3 receives the driving force Fx proportional to the magnetic flux density Bx, and rotates on the arc portion 2 counterclockwise at a high speed. By rotating the arc 3 at high speed on the pinwheel contact at high speed, the local concentration of heat by the arc can be prevented until the current zero point is reached, damage to the contact can be reduced, and the breaking performance can be improved. You can
A reinforcing plate made of a material having a higher electric resistance than the contact or the electrode bar, such as stainless steel, is fixed to the back side of this wind turbine type contact to prevent the contact from being deformed from the load when the contact is closed and when the current is cut off. The inside of the insulating container is prevented from being contaminated by the generated arc.

JP-A-2-201828

In a vacuum valve incorporating a wind turbine type contact, the wind turbine type contact is fitted to a contact fitting portion provided on the electrode rod and fixed by brazing or the like. The arc driving force becomes stronger as the distance between the contact fitting portion of the electrode rod and the arc generating portion of the contact becomes longer. Therefore, by increasing the contact diameter, it is possible to secure the distance between the contact fitting portion of the electrode rod and the arc generation portion of the contact, and it is possible to strengthen the arc driving force. It will lead to shaping. In addition to increasing the contact diameter, it is possible to increase the arc driving force by reducing the diameter of the contact fitting part of the electrode rod to secure the distance between the contact fitting part of the electrode rod and the arc generation point of the contact. Become. However, in this case, there is a problem that the contact fitting portion of the electrode rod is curved due to an electromagnetic force generated by a large current at the time of a short circuit failure.

Further, in order to increase the arc driving force, it is essential to pass an electric current from the contact fitting portion of the electrode rod at a position close to the facing surface of the contact, and a measure for that is required.
Moreover, the wind turbine groove of the wind turbine contact is gradually filled by repeating the current interruption. When the reinforcing plate is fixed to the wind turbine type contact, if the groove on the surface of the contact is filled due to repeated current interruptions, the groove is originally filled with the reinforcing plate on the back side, which is the function as a wind turbine type contact. It loses power and significantly reduces the current interruption performance. If the reinforcing plate is placed away from the contact, the groove on the back side of the contact is still alive even if the groove on the surface of the contact is filled, so it is possible to maintain the function as a wind turbine type contact, but the material, thickness, Depending on the shape, the contacts may be greatly deformed due to closing. It is possible to improve the breaking life by suppressing the bending of the contact fitting portion of the electrode rod due to the electromagnetic force, suppressing the deterioration of the current breaking performance due to repeated current breaking, while maintaining the reinforcing effect of the contacts. Is a problem in.

In the vacuum valve according to the present invention, one end of an insulating cylinder forming a vacuum container is sealed with a fixed side flange and the other end is sealed with a movable side flange, and the fixed side electrode has a fixed side electrode. rod is fixed, collision with the movable side electrode rod is connected through a bellows to the movable flange, said each distal end portion of the fixed electrode rod and the movable electrode rod on the end face of each tip In a vacuum valve in which a fixed-side contact and a movable-side contact are mounted via a reinforcing member that reinforces a provided contact support, the reinforcing member includes a reinforcing cylinder portion fitted to the contact support, and the contact support. And a joining base portion extending along the end surface on which the body is projected, and the reinforcing tubular portion engages with the fixed-side contact and the movable-side contact to reinforce the contact support body. An arc driving groove provided in the fixed side contact and the movable side contact and a vacuum space inside the vacuum container are connected between the fixed side contact and the movable side contact and the joining base. A communication space area is provided.
A communication space region for communicating with the vacuum space is provided.

According to this invention, a reinforcing member having a joining base portion extending to an end surface of an electrode rod on which a contact support body is provided and a reinforcing tubular portion fitted to the contact support body and reinforcing the contact support body is provided. By providing the contact support, the diameter of the contact support in the electrode rod can be reduced with a simple structure. Therefore, the breaking performance can be improved without increasing the contact diameter, which contributes to downsizing of the vacuum valve. Further, by providing a communication space region that communicates the arc driving groove provided in the contact with the vacuum space inside the vacuum container, it is possible to suppress the deterioration of the current interruption performance.

Schematic which shows the structure of the contact of the vacuum valve in the background art which concerns on this invention. FIG. 3 is a schematic cross-sectional view showing the structure of the vacuum valve in the first embodiment according to the present invention. Sectional drawing which shows the contact in the vacuum valve shown in FIG. 3A and 3B are schematic views showing a reinforcing plate in the vacuum valve shown in FIG. 2, where FIG. 3A is a perspective view and FIG. FIG. 3 is an enlarged view of the vicinity of contacts in the vacuum valve shown in FIG. Schematic which shows the modification of the reinforcing plate in Embodiment 1 which concerns on this invention. FIG. 3 is a schematic view showing a structure of a vacuum valve according to a second embodiment of the present invention, (a) is a perspective view and (b) is a sectional view. Sectional drawing which shows the contact in the vacuum valve shown in FIG. FIG. 8 is a schematic view showing a reinforcing plate in the vacuum valve in FIG. 7, (a) is a perspective view, and (b) is a sectional view. FIG. 8 is an enlarged view of the vicinity of contacts in the vacuum valve shown in FIG. It is the schematic which shows the modification of the reinforcement board in Embodiment 3 which concerns on this invention, (a) is a perspective view, (b) is sectional drawing.

Embodiments of the present invention will be described below with reference to the drawings. The present invention relates to a vacuum valve having a fixed-side electrode and a movable-side electrode that are attached to and detached from each other in a vacuum container.

Embodiment 1.
The first embodiment according to the present invention will be described based on FIGS. 1 to 6. 1 is a schematic view showing a structure of a contact point of a vacuum valve in a background art according to the present invention, FIG. 2 is a schematic sectional view showing a structure of a vacuum valve according to a first embodiment, and FIG. 3 is a contact point of the vacuum valve shown in FIG. 4 is a schematic view showing a reinforcing plate in the vacuum valve shown in FIG. 2, (a) is a perspective view, (b) is a cross-sectional view, and FIG. 5 is a view of the vicinity of the contacts in the vacuum valve shown in FIG. FIG. 6 is an enlarged view, and FIG. 6 is a schematic view showing a modification of the reinforcing plate in the first embodiment.

In the schematic sectional view of the vacuum valve of FIG. 2 showing the first embodiment according to the present invention, the vacuum valve is configured as follows. A cylindrical insulating cylinder 4 made of an insulating material such as alumina ceramic is formed with a vacuum container at both ends thereof, and is fixed with a metal such as stainless steel in order to keep the inside airtight under high vacuum. The side flange 5 and the movable side flange 6 are attached. The fixed side flange 5 and the movable side flange 6 are coaxially fixed to the insulating cylinder 4 by vacuum brazing to the metallized layers 7 formed at both ends of the insulating cylinder 4.

A fixed side electrode rod 8 is fixed to a fixed side flange 5 fixed to one end of the insulating cylinder 4, and a movable side electrode rod 9 is attached to a movable side flange 6 via a bellows 10. One end of the bellows 10 and the movable side flange 6 are fixed. The other end of the bellows 10 and the movable electrode rod 9 are fixed to each other via a bellows cover 11 provided for the purpose of preventing the bellows 10 from being contaminated by an arc generated when the current is cut off.

As shown in FIG. 5, the fixed-side electrode rod 8 and the movable-side electrode rod 9 are provided with contact fitting portions 8a and 9a for fitting the wind-turbine-shaped contacts, respectively. The movable side contact 13 is fitted and then fixed. The contact fitting portions 8a and 9a are formed integrally with the electrode rods 8 and 9 so as to project from the end faces ES formed on the lower end of the electrode rod 8 and the upper end of the electrode rod 9, respectively. And a contact support that supports the.
A circular reinforcing plate 14 is provided on the back side of the fixed side contact 12 and the movable side contact 13. As shown in FIG. 4, the reinforcing plate 14 is formed with standing portions 14a so that the central portion of the disk-shaped flat plate portion 14b projects in a cylindrical shape, and is formed on the contact fitting portions 8a and 9a of the electrode rod, respectively. It is fitted and fixed.

Further, as shown in FIG. 3, on the back surface of the fixed-side contact 12, a groove 12a is provided, the inner peripheral portion of which is formed in a concave shape concentric with the axis of the electrode rod. As shown in FIG. 5, the upright portion 14a of the reinforcing plate 14 is inserted into the groove 12a, so that the fixed-side contact 12 is supported in the axial direction of the contact by the tip of the upright portion 14a. A space 17 is provided between the flat plate portion 14 b of the reinforcing plate 14 and the fixed-side contact 12. Further, the back surface of the movable contact 13 is also provided with a groove 13a whose inner peripheral portion is formed in a concave shape concentric with the axis of the electrode rod, as in the case of the fixed contact 12. The standing portions 14a of the reinforcing plate 14 are respectively inserted into the grooves 13a, and a space 17 is provided between the flat plate portion 14b of the reinforcing plate 14 and the movable side contact 13.

Here, as shown in FIG. 1, the wind turbine-shaped fixed side contact 12 and the movable side contact 13 have a plurality of arcuate portions formed by cutting a spiral groove from the central portion of the disc-shaped substrate toward the peripheral portion. 2 is formed to form an arc driving groove that penetrates from one end surface of the disk-shaped substrate to the other end surface thereof.
The erected portion 14a of the reinforcing plate 14 supplements the mechanical strength of the fixed-side contact 12 and the movable-side contact 13, and the contact fitting portions 8a and 9a of the electrode rod are bent by the electromagnetic force generated by the large current flowing at the time of a short circuit failure. It prevents you from doing it. The flat plate portion 14b of the reinforcing plate 14 plays a role of preventing the inside of the vacuum container from being contaminated by an arc generated when the current is cut off.

Since the movable side electrode rod 9 which is fixed to the movable side contact 13 is attached to the movable side flange 6 via the bellows 10, the movable side contact 13 and the fixed side contact 12 are kept on the axial center of the insulating cylinder 4 while maintaining airtightness. It can be moved in and out freely. On the inner surface of the insulating cylinder 4, an arc shield 15 for the purpose of preventing the contamination of the inner surface of the insulating cylinder by the arc generated between the electrodes when the current is cut off is surrounded by the fixed side contact 12 and the movable side contact 13. It is provided in. The guide 16 is made of thermoplastic synthetic resin or the like, and is attached to the movable side flange 6 after vacuum sealing with vacuum brazing. Since the movable electrode rod 9 and the guide 16 serve as a sliding portion, the guide 16 has a bearing function.

The reinforcing plate 14 according to Embodiment 1 of the present invention is made of a metal plate material having high electric resistance such as stainless steel. As shown in FIG. 4, the reinforcing plate 14 has a cylindrical standing portion 14a whose center portion is bent and which is fitted to the contact fitting portions 8a, 9a of the fixed side electrode rod 8 and the movable side electrode rod 9 so as to fit together. It is provided upright from the portion 14b. By arranging the reinforcing plate 14 as described above, spaces 17 are formed between the flat plate portion 14b of the reinforcing plate 14 and the fixed side contact 12 and the movable side contact 13, respectively. Here, the reinforcing plate 14 may be fixed to both the fixed side electrode rod 8 and the movable side electrode rod 9 as well as to both the fixed side contact 12 and the movable side contact 13 by brazing or the like. Alternatively, only the fixed-side electrode rod 8 and the movable-side electrode rod 9 or only the fixed-side contact 12 and the movable-side contact 13 may be fixed by brazing.

As shown in FIGS. 3, 4, and 5, the outer diameter of the contact fitting portion 8a of the fixed electrode rod and the contact fitting portion 9a of the movable electrode rod is a, and the inner diameter of the reinforcing plate 14 is d. In that case, it is preferable that d≧a.
When the diameter of the groove 12a of the fixed side contact and the groove 13a of the movable side contact is b and the outer diameter of the standing portion 14a of the reinforcing plate 14 is e, it is desirable that b≧e. When the height of the standing portion 14a of the reinforcing plate 14 is f, the depth of the groove 12a of the fixed side contact 12 and the groove 13a of the movable side contact 13 is c, and the height of the space 17 is g, g = f- c.

(Modification)
In the first embodiment, the reinforcing plate 14 may have a shape as shown in FIG. As shown in FIG. 6, R processing is applied to the boundary between the upright portion 14a of the reinforcing plate 14 and the flat plate portion 14b in anticipation of the press working. Also in this case, the reinforcing plate 14 may be fixed to both the fixed side electrode rod 8 and the movable side electrode rod 9 as well as the fixed side contact 12 and the movable side contact 13 by brazing or the like. Alternatively, only the fixed-side electrode rod 8 and the movable-side electrode rod 9 or only the fixed-side contact 12 and the movable-side contact 13 may be fixed by brazing.

As shown in FIG. 6, as in FIGS. 3, 4, and 5, the outer diameter of the contact fitting portion 8a of the fixed electrode rod 8 and the contact fitting portion 9a of the movable electrode rod 9 is a, and the reinforcing plate is When the inner diameter of 14 is d, it is preferable that d≧a.
Further, when the diameter of the groove 12a of the fixed side contact 12 and the groove 13a of the movable side contact 13 is b and the outer diameter of the standing portion 14a of the reinforcing plate 14 is e, it is desirable that b≧e. When the height of the standing portion 14a of the reinforcing plate 14 is f, the depth of the groove 12a of the fixed side contact 12 and the groove 13a of the movable side contact 13 is c, and the height of the space 17 is g, g = f- c. Although FIG. 6 shows an example in which R processing is performed at the boundary between the upright portion 14a and the flat plate portion 14b of the reinforcing plate 14, it goes without saying that taper processing may be used instead of R processing.

The standing portion 14a of the reinforcing plate 14 is fitted to the contact fitting portion 8a of the fixed side electrode rod 8 and the contact fitting portion 9a of the movable side electrode rod 9, and the groove 12a of the fixed side contact 12 and the movable side contact 13 are fitted. By being inserted into and fixed to the groove 13a, the contacts are supported without increasing the number of parts, and the contact fitting portion 8a of the fixed electrode rod 8 and the contact fitting portion 9a of the movable electrode rod 9 are reinforced. It is possible to reduce the diameter of the contact fitting portion of the electrode rod, improve the breaking performance without increasing the contact diameter, and contribute to downsizing of the vacuum valve.

The groove 13a of the groove 12a and the movable contact 13 of the fixed contact 12 is provided, the standing portion 14a of the reinforcing plate 14 made here of a material having a high electrical resistance than the material, such as stainless steel contact material or the electrode rod By inserting it, current can be made to flow from the contact fitting portion of the electrode rod at a position close to the contact facing surface, the driving force of the arc can be further increased, and the breaking performance can be improved.
By providing the space 17 between the fixed side contact 12 and the movable side contact 13 and the flat plate portion 14b of the reinforcing plate 14, even if the wind turbine groove on the opposing contact surface is filled by repeatedly interrupting the current, the reinforcing plate of the contact is provided. Since the wind turbine groove on the side is still alive, it is possible to continuously interrupt the current. Conventionally, in order to improve the breaking life, it was necessary to increase the contact diameter or change the arc shield to a material having a high thermal conductivity such as Cu or CuCr, but according to the present invention, the size of the vacuum valve is increased. It is possible to suppress the cost increase.

(1) As shown in FIGS. 2 to 6, the vacuum valve according to the first embodiment of the present invention has the following configuration.
One end of the insulating cylinder 4 is sealed with a fixed side flange 5 and the other end is sealed with a movable side flange 6, a fixed side electrode rod 8 is fixed to the fixed side flange 5, and a bellows is attached to the movable side flange 6. The movable electrode rod 9 is connected via 10. Further, the present invention relates to a vacuum valve in which fixed side contacts 12 and movable side contacts 13 are attached to the respective ends of the fixed side electrode rod 8 and the movable side electrode rod 9 via reinforcing members made of a reinforcing plate 14. The reinforcing member is made of a contact material such as stainless steel or a material having a higher electric resistance than the material of the electrode rod, and is projectingly provided on the end surface ES of each tip of the fixed electrode rod and the movable electrode rod. From the reinforcing cylinder portion including the standing portion 14a fitted to the contact support body including the contact fitting portion 8a, and the flat plate portion 14b extending along the end surface ES on which the contact fitting portion 6a is projected. And a joining base part.

Further, the tip portion of the reinforcing tubular portion formed of the upright portion 14a is engaged with the circular concave portion 12a provided in the fixed side contact 12 and the movable side contact 13 by fitting. As a result, the reinforcing member formed of the reinforcing plate 14 supports the fixed side contact 12 and the movable side contact 13 together with the contact support body formed of the contact fitting portion 8a, and the reinforcing cylinder portion formed of the upright portion 14a is contact fitted. The contact support made of the portion 8a is reinforced. The fixed-side contact 12 and the movable-side contact 13 are provided between the fixed-side contact 12 and the movable-side contact 13 and the joining base formed of the flat plate portion 14b of the reinforcing member including the reinforcing plate 14. There is provided a communication space region CR formed of a space 17 that connects the arc driving groove portion formed of the spiral groove 1 and the vacuum space inside the vacuum container.

In this structure, the contact support body including the contact fitting portions 8a and 9a is provided on each end surface of the electrode rods 8 and 9 so as to project therefrom. The joining base portion is formed of a flat plate portion 14b extending to each end surface of the electrode rods 8 and 9, and the reinforcing cylinder portion is formed of an upright portion 14a that is fitted to the contact support body to reinforce the contact support body. A reinforcing member including the reinforcing plate 14 is provided. As a result, it is possible to reduce the diameter of the contact support body including the contact fitting portions 8a and 9a of the electrode rods 8 and 9 with a simple structure. Therefore, the breaking performance can be improved without increasing the contact diameter, which contributes to downsizing of the vacuum valve.
Further, by providing the communication space region CR that connects the arc driving groove portion formed of the spiral groove 1 provided in the contacts 12 and 13 and the vacuum space VR inside the vacuum container, it is possible to suppress the deterioration of the current interruption performance. can do.

That is, the reinforcing cylinder portion including the upright portion 14a of the reinforcing member including the reinforcing plate 14 is fitted to the contact fitting portions 8a and 9a of the electrode rods 8 and 9 and is formed on the back surface portion of the contacts 12 and 13. By being inserted into the groove formed by the circular concave portion, the contacts 12 and 13 can be supported and the contact fitting portions 8a and 9a of the electrode rods 8 and 9 can be reinforced without increasing the number of parts. Further, the contact fitting portions 8a and 9a of the electrode rod can be made thinner, and the breaking performance can be improved without increasing the diameter of the contacts 12 and 13, which contributes to downsizing of the vacuum valve.

Furthermore, a groove portion 12a formed of a circular recess in contact back, the 13a provided from the standing portion 14a of the reinforcing member made from the reinforcing plate 14 made of a material having a high electrical resistance than the material, such as stainless steel contact material or the electrode rod By inserting the reinforcing cylinder part, the electric current can be made to flow from the contact fitting parts 8a and 9a of the electrode rods 8 and 9 at positions close to the facing surfaces of the contacts 12 and 13, and the driving force of the arc can be increased. It is possible to further improve the cutoff performance.

A communication space region CR formed by a space 17 is provided between the contacts 12, 13 and the reinforcing base formed by the flat plate portion 14b of the reinforcing member formed by the reinforcing plate 14. Therefore, even if the current interruption is repeated and the wind turbine groove 1 on the surfaces of the opposing contacts 12 and 13 is filled, the wind turbine groove on the reinforcing plate side of the contact is still alive, and thus the current interruption can be continued. Conventionally, in order to improve the breaking life, it was necessary to increase the contact diameter or change the arc shield to a material having a high thermal conductivity such as Cu or CuCr, but according to the present invention, the size of the vacuum valve is increased. Alternatively, cost increase can be suppressed.

(2) As for the vacuum valve in the first embodiment according to the present invention, the following configuration is applied in the configuration in the above item (1) as shown in FIG.
The fixed side contact 12 and the movable side contact 13 are provided with the arc driving groove portion by cutting the spiral groove 1 from the central portion toward the peripheral portion, and form a plurality of arc portions 2. It is a windmill-shaped contact point.
With this configuration, in the vacuum valve having the same wind turbine contact as the background art according to the present invention, the breaking performance can be improved without increasing the contact diameter, which contributes to downsizing and the current breaking performance. The decrease can be suppressed.

(3) The vacuum valve according to the first embodiment of the present invention has the following configuration applied in the configuration in the above (1) or (2) as shown in FIGS. 2 to 6. There is.
The reinforcing member including the reinforcing plate 14 is made of a material having a higher electric resistance than the fixed-side contact 12 and the movable-side contact 13, and is a central portion of the joining base portion including a disc-shaped flat plate portion 14b. It has the above-mentioned reinforcement cylinder part which consists of the standing part 14a projected in the shape of a cylinder. The inner surface of the reinforcing cylinder is fitted to the contact fitting portions 8a, 9a of the fixed electrode rod 8 and the movable electrode rod 9. Further, the reinforcing cylinder portion formed of the upright portion 14a is provided in the groove portions 12a and 13a formed of circular concave portions provided on the back surface on the opposite side to the contact surface in the central portion of the fixed side contact 12 and the movable side contact 13, respectively. Inserted. Thereby, the reinforcing member supports the fixed side contact 12 and the movable side contact 13.

With this configuration, it is possible to reliably perform the reinforcing action of the contact fitting portions 8a and 9a provided on the fixed electrode rod 8 and the movable electrode rod 9 and the supporting action of the fixed contact 12 and the movable contact 13. Therefore, it is possible to obtain a vacuum valve that can improve the breaking performance without increasing the contact diameter, contribute to downsizing, and suppress a decrease in the current breaking performance.

(4) In the vacuum valve according to the first embodiment of the present invention, the following configuration is applied in the configuration in the above (3), as shown in FIG.
A circle as so-called R processing at a boundary between the cylindrical reinforcing cylinder portion including the upright portion 14a provided on the reinforcing member including the reinforcing plate 14 and the disc-shaped joining base portion including the flat plate portion 14b. It is arc-shaped or tapered.
With this configuration, the contact fitting portions provided on the fixed side electrode rod 8 and the movable side electrode rod 9 of the cylindrical reinforcing cylinder portion including the standing portion 14a provided on the reinforcing member including the reinforcing plate 14. It is possible to properly and surely perform the fitting operation to the 8a and 9a. Therefore, it is possible to obtain a vacuum valve that can improve the breaking performance without increasing the contact diameter, contribute to downsizing, and suppress a decrease in the current breaking performance.

(5) The vacuum valve according to the first embodiment of the present invention has the following configuration applied to the configuration in the above (3) or (4) as shown in FIGS. 2 to 6. There is.
For each component of the vacuum valve, a to g are set as follows.
In this case, it is assumed that d≧a, b≧e, and g = fc.
a: Outer diameter of the contact fitting portions 8a, 9a in the fixed side electrode rod 8 and the movable side electrode rod 9.
b: The diameter of the circular concave portion formed by the groove portions 12a and 13a in the fixed side contact 12 and the movable side contact 13.
c: Depth of the circular concave portion formed of the groove portions 12a and 13a in the fixed side contact 12 and the movable side contact 13.
d: Inner diameter of the reinforcing tubular portion formed of the upright portion 14a of the reinforcing member formed of the reinforcing plate 14.
e: Outer diameter of the reinforcing tubular portion including the upright portion 14a of the reinforcing member including the reinforcing plate 14.
f: Dimension in the extending direction of the reinforcing cylinder portion formed of the upright portion 14a of the reinforcing member formed of the reinforcing plate 14.
g: The size of the communication space region CR formed by the space 17 between the fixed side contact 12 and the movable side contact 13, and the joining base formed by the flat plate portion 14b of the reinforcing member formed by the reinforcing plate 14.

With this configuration, it is possible to secure the proper arrangement of the fixed side contact 12, the movable side contact 13, and the reinforcing member composed of the reinforcing plate 14, and to improve the breaking performance without increasing the contact diameter, which contributes to downsizing. At the same time, it is possible to obtain a vacuum valve capable of suppressing a decrease in current interruption performance.

(6) In the vacuum valve according to the first embodiment of the present invention, the following configuration is applied to the configuration according to any one of the items (1) to (5).
The reinforcing member including the reinforcing plate 14 is fixed to only the fixed side contact 12 and the movable side contact 13 by brazing or the like, and is in contact with the fixed side electrode rod 8 and the movable side electrode rod 9. It is said to be in a bonded state.
With this configuration, in the vacuum valve in which the reinforcing member including the reinforcing plate 14 is fixed only to the fixed side contact 12 and the movable side contact 13, the breaking performance can be improved without increasing the contact diameter, It is possible to contribute to downsizing of the vacuum valve and to suppress deterioration of current interruption performance.

(7) The vacuum valve according to the first embodiment of the present invention has the structure according to any one of the items (1) to (5),
The following configurations have been applied: The reinforcing member including the reinforcing plate 14 is fixed to only the fixed side electrode rod 8 and the movable side electrode rod 9 by brazing or the like, and is in contact with the fixed side contact 12 and the movable side contact 13. It is said to be in a bonded state.
With this configuration, in the vacuum valve in which the reinforcing member including the reinforcing plate 14 is fixed only to the fixed side electrode rod 8 and the movable side electrode rod 9, the breaking performance can be improved without increasing the contact diameter. Therefore, it is possible to contribute to downsizing of the vacuum valve, and it is possible to suppress deterioration of the current interruption performance.

(8) In the vacuum valve according to the first embodiment of the present invention, the following configuration is applied to the configuration in any one of the items (1) to (5).
The reinforcing member composed of a reinforcing plate 14 is fixed to all of the fixed side contact 12, the movable side contact 12, the fixed side electrode rod 8 and the movable side electrode rod 9.
With this configuration, in the vacuum valve fixed to the fixed side contact 12 and the movable side contact 12, and the fixed side electrode rod 8 and the movable side electrode rod 9, the reinforcing member including the reinforcing plate 14 has a contact diameter of The breaking performance can be improved without increasing the size of the vacuum valve, which contributes to downsizing of the vacuum valve and the reduction of the current breaking performance.

Embodiment 2.
The first embodiment according to the present invention will be described based on FIGS. 7 to 10. 7A and 7B are schematic diagrams showing the structure of the vacuum valve in the second embodiment, where FIG. 7A is a perspective view and FIG. 7B is a sectional view. FIG. 8 is a cross-sectional view showing the contacts in the vacuum valve shown in FIG. 9A and 9B are schematic views showing a reinforcing plate in the vacuum valve in FIG. 7, where FIG. 9A is a perspective view and FIG. 9B is a sectional view. FIG. 10 is an enlarged view of the vicinity of the contacts in the vacuum valve shown in FIG.
The structure of the vacuum valve in the second embodiment of the present invention is as shown in FIG. 7, and in the vacuum valve schematic cross-sectional view shown in FIG. 2 of the first embodiment, the circular reinforcing plate 14 has a different shape in the embodiment. Since the other structure is the same as that of the first embodiment, detailed description will be omitted.

FIG. 9 shows the structure of the reinforcing plate 14 according to Embodiment 2 of the present invention. The reinforcing plate 14 according to the second embodiment is made of a metal plate material having high electric resistance such as stainless steel. An upright portion 14a is formed at the center of the reinforcing plate 14 as shown in FIG. The inside of the standing portion 14a is fitted and fixed to the contact fitting portions 8a and 9a of the electrode rod, respectively.
Further, as shown in FIG. 10, the standing portion 14a is inserted into the grooves 12a and 13a of the fixed side contact 12 and the movable side contact 13 shown in FIG. A space 17 is provided between the flat plate portion 14b of the reinforcing plate 14 and the fixed-side contact 12 and the movable-side contact 13, which are supported. The erected portion 14a of the reinforcing plate 14 supplements the mechanical strength of the fixed-side contact 12 and the movable-side contact 13, and the contact fitting portions 8a and 9a of the electrode rod are bent by the electromagnetic force generated by the large current flowing at the time of a short circuit failure. It prevents you from doing it.

Here, the reinforcing plate 14 may be fixed to both the fixed-side electrode rod 8 and the movable-side electrode rod 9 as well as to both the fixed-side contact 12 and the movable-side contact 13 by brazing or the like. Alternatively, only the fixed-side electrode rod 8 and the movable-side electrode rod 9 or only the fixed-side contact 12 and the movable-side contact 13 may be fixed by brazing.
Further, as shown in FIGS. 8, 9 and 10, the outer diameter of the contact fitting portion 8a of the fixed side electrode rod and the contact fitting portion 9a of the movable side electrode rod is a′, and the inner diameter of the reinforcing plate 14 is d. In the case of “,” it is preferable that d′≧a′. Further, when the diameter of the groove 12a of the fixed side contact and the groove 13a of the movable side contact is b'and the outer diameter of the standing portion 14a of the reinforcing plate 14 is e', it is desirable that b'≥e'. When the height of the standing portion 14a of the reinforcing plate 14 is f', the depth of the groove 12a of the fixed side contact 12 and the groove 13a of the movable side contact 13 is c', and the height of the space 17 is g', g ' = f'-c'.

As shown in FIGS. 7 to 10, the vacuum valve according to the second embodiment of the present invention has the following configuration.
The reinforcing member including the reinforcing plate 14 is made of a material having higher electric resistance than the fixed side contact 12 and the movable side contact 13. The reinforcing member including the reinforcing plate 14 has the reinforcing tubular portion including a standing portion 14a that is cylindrically protruded from a central portion of the joining base portion including a flat plate portion 14b formed in a disc shape. The inner surface of the reinforcing cylinder is fitted to the contact fitting portions of the fixed electrode rod 8 and the movable electrode rod 9.

Further, the reinforcing tubular portion formed of the upright portion 14a is inserted into the groove portions 12a and 13a formed of circular concave portions provided in the central portions of the fixed side contact 12 and the movable side contact 13, whereby the reinforcing It is assumed that a member supports the fixed side contact 12 and the movable side contact 13.
Further, the reinforcing tubular portion formed of the upright portion 14a of the reinforcing member formed of the reinforcing plate 14 is formed such that the tip end portion is more open than the root portion connected to the joining base portion formed of the flat plate portion 14b. As a result, the shape has a shrinkage margin.

With this configuration, the contact fitting portions provided on the fixed side electrode rod 8 and the movable side electrode rod 9 of the cylindrical reinforcing cylinder portion including the standing portion 14a provided on the reinforcing member including the reinforcing plate 14. The fitting action to 8a and 9a can be appropriately and reliably performed by the shrinkage allowance formed so that the tip end portion of the reinforcing cylinder portion including the standing portion 14a is more open. Therefore, it is possible to obtain a vacuum valve that can improve the breaking performance without increasing the contact diameter, contribute to downsizing, and suppress a decrease in the current breaking performance.

Embodiment 3.
The third embodiment according to the present invention will be described with reference to FIG. 11A and 11B are schematic views showing a modification of the reinforcing plate according to the third embodiment, where FIG. 11A is a perspective view and FIG. 11B is a sectional view.

In the second embodiment, the upright portion 14a has a shape opened to the outside as shown in FIG. 9, but in the third embodiment, the upright portion 14a of the reinforcing plate 14 has the shape as shown in FIG. As shown in FIG. 11, the standing portion 14a of the reinforcing plate 14 has a shape that is completely folded back from the center portion. Also in this case, the reinforcing plate 14 may be fixed to both the fixed-side electrode rod 8 and the movable-side electrode rod 9 as well as to both the fixed-side contact 12 and the movable-side contact 13 by brazing or the like. Alternatively, only the fixed-side electrode rod 8 and the movable-side electrode rod 9 or only the fixed-side contact 12 and the movable-side contact 13 may be fixed by brazing.

Further, as shown in FIGS. 8, 9, and 10, the outer diameter of the contact fitting portion 8a of the fixed side electrode rod 8 and the contact fitting portion 9a of the movable side electrode rod 9 is a′, and the inner diameter of the reinforcing plate 14 is When d is d′, it is preferable that d′≧a′. When the diameter of the groove 12a of the fixed side contact 12 and the groove 13a of the movable side contact 13 is b'and the outer diameter of the standing portion 14a of the reinforcing plate 14 is e', b'≥e' may be satisfied. desirable. If the height of the standing portion 14e of the reinforcing plate 14 is f', the depth of the groove 12e of the fixed side contact 12 and the groove 13a of the movable side contact 13 is c', and the height of the space 17 is g', g ' = f'-c'.

By providing the reinforcing plate 14 with the erected portion 14a as shown in FIG. 9 or 11, and by providing the displacement portion in the radial direction, the reinforcing plate 14 has a slight shrinkage allowance (in the axial direction of the electrode rod). It becomes possible to make the fixed side contact 12 and the movable side contact 13 more familiar with each other when the contact is closed, and the contact area of the contact surface can be widened to reduce the contact resistance of the vacuum valve. By reducing the contact resistance, the fixed-side electrode rod 8 or the movable-side electrode rod 9 of the vacuum valve can be reduced in diameter, which leads to weight reduction or cost reduction of the vacuum valve.
Further, by reducing the contact resistance, it is possible to reduce the contact pressure load on the switch main body and simplify the heat dissipation structure, which leads to cost reduction of the switch main body.

The standing portion 14a of the reinforcing plate 14 is fitted to the contact fitting portion 8a of the fixed side electrode rod 8 and the contact fitting portion 9a of the movable side electrode rod 9, and the groove 12a of the fixed side contact 12 and the movable side contact 13 are fitted. By being inserted into the groove 13a, the contacts can be supported without increasing the number of parts, and the contact fitting portion 8a of the fixed electrode rod 8 and the contact fitting portion 9a of the movable electrode rod 9 can be reinforced. As a result, the contact fitting portion of the electrode rod can be reduced in diameter, the breaking performance can be improved without increasing the contact diameter, and it is possible to contribute to downsizing of the vacuum valve.

As in the first embodiment, the groove 13a of the groove 12a and the movable contact 13 of the fixed contact 12 is provided, the reinforcement made here of a material having a high electrical resistance than the material, such as stainless steel contact material or the electrode rod By inserting the erected portion 14a of the plate 14, it becomes possible to flow an electric current from the contact fitting portion of the electrode rod at a position close to the contact facing surface, further improving the driving force of the arc and improving the breaking performance. Can be achieved.
By providing a space between the fixed-side contact 12 and the movable-side contact 13 and the flat plate portion 14b of the reinforcing plate 14, current interruption is repeated, and even if the windmill groove on the opposing contact surface is filled, the reinforcing plate side of the contact is provided. Since the wind turbine groove of is in good condition, the current can be continuously cut without increasing the contact diameter or changing the arc shield to a material with high thermal conductivity such as Cu or CuCr. And increase in cost can be suppressed.

The vacuum valve according to the third embodiment of the present invention has the following configuration, as shown in FIG.
The reinforcing member including the reinforcing plate 14 is made of a material having higher electric resistance than the fixed side contact 12 and the movable side contact 13. The reinforcing member including the reinforcing plate 14 has the reinforcing tubular portion including a standing portion 14a that is cylindrically protruded from a central portion of the joining base portion including a flat plate portion 14b formed in a disc shape. The inner surface of the reinforcing cylinder is fitted to the contact fitting portions of the fixed electrode rod 8 and the movable electrode rod 9.

Further, the reinforcing tubular portion formed of the upright portion 14a is inserted into the groove portions 12a and 13a formed of circular concave portions provided in the central portions of the fixed side contact 12 and the movable side contact 13, whereby the reinforcing A member supports the fixed side contact 12 and the movable side contact 13.
Further, the reinforcing tubular portion including the upright portion 14a of the reinforcing member including the reinforcing plate 14 has a shape in which a shrinkage margin is provided by folding the tip end portion outward.

With this configuration, the contact fitting portions provided on the fixed side electrode rod 8 and the movable side electrode rod 9 of the cylindrical reinforcing cylinder portion including the standing portion 14a provided on the reinforcing member including the reinforcing plate 14. The fitting action with 8a and 9a can be appropriately and reliably performed by the shrinkage allowance formed by the tip end portion of the reinforcing cylinder portion including the standing portion 14a being folded back outward. Therefore, it is possible to obtain a vacuum valve that can improve the breaking performance without increasing the contact diameter, contribute to downsizing, and suppress a decrease in the current breaking performance.

It should be noted that, in the present invention, the embodiments can be freely combined, or the respective embodiments can be appropriately modified or omitted within the scope of the invention.

4 insulating cylinders, 5 fixed side flange, 6 movable side flange, 7 metallized layer, 8 fixed side electrode rod, 8a fixed side electrode rod contact fitting part, 9 movable side electrode rod, 9a movable side electrode rod contact fit Part, 10 bellows, 11 bellows cover, 12 fixed side contact, 12a groove , 13 movable side contact, 13a groove , 14 reinforcing plate, 14a standing part, 14b flat plate part, 15 arc shield, 16 guide, 17 space, CR communication Spatial area.

Claims (10)

One end of an insulating cylinder forming a vacuum container is sealed by a fixed side flange and the other end is sealed by a movable side flange, and a fixed side electrode rod is fixed to the fixed side flange, the movable side electrode rod is connected through a bellows to the flange, the reinforcing said stationary electrode rod and the contact carrier projecting from the end surface of the respective tip portions on each tip portion of the movable electrode rod In a vacuum valve in which a fixed side contact and a movable side contact are mounted via a reinforcing member, the reinforcing member includes a reinforcing cylinder portion fitted to the contact point support body, and the end surface on which the contact point support body projects. A reinforcing base portion that engages with the fixed-side contact and the movable-side contact to reinforce the contact support, and the fixed-side contact and the movable portion. Between the side contact and the joining base portion, there is provided a communication space region that communicates the arc drive groove portion provided in the fixed side contact and the movable side contact with the vacuum space inside the vacuum container. A vacuum valve that is characterized by The fixed-side contact and the movable-side contact are windmill-shaped contacts in which a spiral groove is cut from a central portion toward a peripheral portion to provide the arc driving groove portion and form a plurality of arc portions. The vacuum valve according to claim 1, wherein: Said reinforcing member, said fixed contact and said fabricated from high electrical resistance of the wood charge than movable contact, said reinforcing protruded in a cylindrical shape from the center of the bonding base which is formed in a disk shape A tubular portion is provided, and an inner surface of the reinforcing tubular portion is fitted into contact fitting portions of the fixed side electrode rod and the movable side electrode rod, and the reinforcing tubular portion has the fixed side contact and the movable side. The reinforcing member supports the fixed-side contact and the movable-side contact by being inserted into a circular recess provided in the center of the contact, and the reinforcing member supports the fixed-side contact and the movable-side contact. Vacuum valve described. The arc-shaped processing or the taper processing is applied to a boundary between the cylindrical reinforcing cylinder portion provided on the reinforcing member and the disc-shaped joining base portion. Vacuum valve. 4. The reinforcing tube portion of the reinforcing member is formed to have a shrinkage allowance by being formed so that a tip end portion is more open than a root portion connected to the joining base portion. Alternatively, the vacuum valve according to claim 4. The vacuum valve according to claim 3, wherein the reinforcing tubular portion of the reinforcing member has a shape in which a tip end portion is folded back outward to provide a shrinkage margin. The outer diameter of the contact fitting portion of the fixed electrode rod and the movable electrode rod is a, the diameter of the circular concave portion of the fixed contact and the movable contact is b, the fixed contact and the movable side. The depth of the circular concave portion at the contact point is c, the inner diameter of the reinforcing tubular portion of the reinforcing member is d, the outer diameter of the reinforcing tubular portion of the reinforcing member is e, the reinforcing tubular portion of the reinforcing member. Where f is the dimension in the extending direction and g is the dimension of the communication space region between the fixed side contact and the movable side contact and the joining base portion of the reinforcing member, d≧a, b≧e, The vacuum valve according to claim 3 or 4, wherein g = fc is satisfied. The reinforcing member, the vacuum valve according to any one of claims 1 to 7, characterized in that only affixed to the stationary contact and the movable contact. The reinforcing member, the vacuum valve according to any one of claims 1 to 7, characterized in that only affixed to the stationary electrode rod and the movable side electrode rod. The reinforcing member is in any one of claims 1, characterized in that it is secured to the stationary contact and said movable contact and said fixed side electrode rod and the movable electrode rod to claim 7 Vacuum valve described.

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