JP7129901B2 - vacuum valve - Google Patents

Description

This application relates to vacuum valves, in particular vacuum valves with pinwheel contacts.

Vacuum valves mounted on vacuum circuit breakers and vacuum switches generally consist of an insulating container, a shield, a fixed side contact, a fixed side reinforcing plate, a fixed side electrode rod, a fixed side metal flange, a movable side contact, and a movable side reinforcement. It consists of a plate, movable electrode rod, bellows cover, bellows, movable metal flange, and guide.
One of the types of contacts described above is the windmill contact. A windmill contact is formed by a plurality of windmill blades partitioned by grooves for regulating current paths. The current flowing through the windmill contact is generated by an arc generated between the windmill blades and the contacts. through to the wind turbine blade portion of the opposing contact. A magnetic driving force of the arc is generated by a magnetic field generated by a current that flows through the windmill blade portion and is restricted by the groove portion for current path restriction. This magnetic driving force causes the arc to rotate around the outer periphery of the windmill contact, which prevents local heating of the contact surface and improves breaking performance.

Japanese Patent Application Laid-Open No. 2004-281059

In conventional vacuum valves, when a reinforcing plate is not provided between the pinwheel contact and the electrode rod, and the strength of the contact material is low, or when the impact at the time of insertion is large, or when the contact pressure load is large, etc. Under these conditions, the contact may be deformed. In order to reinforce the contact, as shown in Patent Document 1, when a reinforcing plate having a hole along the energization path regulating groove is provided on the back surface of the contact of the windmill contact, the reinforcing plate connected at the outer peripheral portion Leakage current flows from the wind turbine blade to the adjacent wind turbine blade. The flow of this leakage current reduces the current flowing in the direction of the wind turbine blades, weakening the magnetic driving force of the arc and lowering the breaking performance.

This application was made in order to solve the above-mentioned problems, and it is an object of the present application to reliably prevent leakage current due to reinforcing members provided in windmill-shaped contacts and to improve breaking performance.

The vacuum valve disclosed in this application comprises a pair of windmill-shaped contacts that are housed in a vacuum vessel with one surfaces facing each other and arranged to be able to contact and separate each other. At least one of the windmill-shaped contacts has a leakage current blocking groove corresponding to the current-carrying-path regulating groove. A reinforcing member is provided on the other surface of the windmill-shaped contact to reinforce the windmill-shaped contact, and the width of the leakage current blocking groove in the reinforcing member is narrower than the width of the conducting path regulating groove of the windmill-shaped contact. It is characterized by being formed .

According to the vacuum valve disclosed in this application, by providing the leakage current blocking groove portion in the reinforcing member provided in the windmill contact, the leakage current due to the reinforcing member can be reliably blocked, and the breaking performance can be improved. .

2 is a cross-sectional view showing the configuration of the vacuum valve in Embodiment 1. FIG. 4A and 4B are a cross-sectional view and a perspective view showing the shape of a reinforcing plate according to Embodiment 1. FIG. 3A and 3B are a cross-sectional view and a perspective view showing the assembly structure of the reinforcing plate and the windmill-shaped contact in Embodiment 1. FIG. 8A and 8B are a cross-sectional view and a perspective view showing the shape of a reinforcing plate according to Embodiment 2; FIG. 8A and 8B are a cross-sectional view and a perspective view showing an assembly configuration of a reinforcing plate and a windmill-shaped contact in Embodiment 2; FIG. 8A and 8B are a cross-sectional view and a perspective view showing the shape of a reinforcing plate according to Embodiment 3. FIG. FIG. 11 is a cross-sectional view and a perspective view showing an assembled shape of a reinforcing plate and a pinwheel-shaped contact in Embodiment 3; FIG. 10 is a cross-sectional view and a perspective view showing the shape of a reinforcing plate according to Embodiment 4; FIG. 12 is a cross-sectional view and a perspective view showing an assembly configuration of a reinforcing plate and a windmill-shaped contact in Embodiment 4; FIG. 14 is a cross-sectional view and a perspective view showing the shape of a reinforcing plate according to Embodiment 5; FIG. 11 is a cross-sectional view and a perspective view showing an assembly structure of a reinforcing plate and a pinwheel-shaped contact in Embodiment 5;

Hereinafter, in order to describe this application in more detail, embodiments for carrying out this application will be described with reference to the accompanying drawings.
Embodiment 1.
Embodiment 1 will be described with reference to FIGS. 1 to 3. FIG. 1 is a sectional view showing the configuration of the vacuum valve in Embodiment 1, FIG. 2(a) is a sectional view showing the shape of the reinforcing plate in Embodiment 1, FIG. 2(b) is a perspective view, FIG. ) is a cross-sectional view showing the assembly shape of the reinforcing plate and the pinwheel contact in Embodiment 1, and FIG. 3(b) is a perspective view.

As shown in FIG. 1, the vacuum valve in Embodiment 1 includes an insulating container 1, a shield 2, a movable side contact 3, a movable side reinforcing plate 4, a movable side electrode rod 5, a fixed side metal flange 6, and a fixed side contact 7. , fixed-side reinforcing plate 8 , fixed-side electrode rod 9 , bellows cover 10 , bellows 11 , movable-side metal flange 12 , and guide 13 . The insulating portion SR of the insulating container 1 surrounds the movable side contact 3 and the fixed side contact 7 .
As shown in FIG. 3, the movable side contact 3 and the fixed side contact 7 are configured as windmill-shaped contacts each having a current-carrying path restricting groove portion SC. The movable side contact 3 is supported by the movable side electrode rod 5 and the fixed side contact 7 is held by the fixed side electrode rod 9. The movable side contact 3 and the fixed side contact 7 are opened and closed by the opening and closing operation of the movable side electrode rod 5. are moved towards and away from each other in the direction of separation SD (see FIG. 1).

The energization path regulating grooves SC, which are provided in the movable side contact 3 and the fixed side contact 7 and partition and form a plurality of wind turbine blade portions WG that are arranged in parallel and serve as individual contacts, separate the movable side contact 3 and the fixed side contact 7 from each other. Electromagnetic force generated by the current flowing in the current path via the arc and applied to the arc. , the arc is moved to the outer peripheral portion along the energization path regulation groove SC to effectively extinguish the arc. The energizing path regulating groove portion SC is a penetrating portion that extends from an outer peripheral end portion SCa that opens in the outer diameter direction to an inner diameter end portion SCb in the outer peripheral portion of the disk-shaped movable side contact 3 and the fixed side contact 7 . formed as grooves. The windmill blade portion WG extends from the inner diameter portions of the movable side contact 3 and the fixed side contact 7 while being curved in the outer diameter direction.

The movable-side reinforcing plate 4 and the fixed-side reinforcing plate 8 are fixed between the movable-side contact 3 and the movable-side electrode rod 5 and between the fixed-side contact 7 and the fixed-side electrode rod 9. The side contact 3 and the fixed side contact 7 are reinforced respectively.
As shown in FIGS. 2(a) and 2(b), the movable-side reinforcing plate 4 and the fixed-side reinforcing plate 8 have leakage currents corresponding to the energization path regulation grooves SC provided in the movable-side contact 3 and the fixed-side contact 7. A current blocking groove RC is provided.
That is, the reinforcing plates 4 and 8 are made of a metal material (for example, stainless steel) stronger than the contact material strength of the windmill-shaped contacts 3 and 7 as a base material, A leakage current blocking groove RC is provided that is cut to the outer periphery. Further, the reinforcing plates 4 and 8 are preferably arranged on both the fixed side and the movable side, but they may be arranged only on either side.

The arc-shaped grooves provided in the disk-shaped windmill-shaped contacts 3 and 7 are oriented in the radial direction from the outer peripheral end SCa, which is open in the outer diameter direction, to the inner diameter end SCb on the outer peripheral surface of the windmill-shaped contacts 3 and 7. A plurality of wind-turbine blades WG are formed by bending and extending to form a plurality of individually divided grooves SC for regulating current flow through the wind-turbine contacts 3 and 7 . Efficient arc extinguishing action is achieved by regulating the current-carrying path by the current-carrying-path regulating groove SC.

The reinforcing plates 4 and 8 are provided with a curved portion extending from the outer peripheral end portion RCa to the inner diameter end portion RCb corresponding to the current-carrying path restricting groove portion SC provided in the windmill-shaped contacts 3 and 7 to absorb the leakage current. A leakage current blocking groove RC is provided for blocking. Leakage current that flows through the reinforcing plates 4 and 8 from the original current path through the windmill blades WG of the windmill contacts 3 and 7 can be blocked by the leakage current blocking grooves RC.
The width of the leakage current blocking groove portion RC and the length dimension from the outer peripheral end portion RCa to the inner diameter end portion RCb are the width of the conducting path regulating groove portion SC in the windmill contacts 3 and 7 and the length from the outer peripheral end portion SCa to the inner end portion SCb. is the same as the length dimension of

Further, in order to prevent the leakage current flowing through the reinforcing plates 4 and 8, the width of the leakage current blocking groove RC is set larger than the width of the conducting path regulating groove SC provided in the windmill contacts 3 and 7. It may be narrow, and the narrowed leakage current blocking groove RC can also reduce the scattering of metal sputtering that occurs when the windmill-shaped contacts 3 and 7 are opened and ignited.

As described above, the vacuum valve according to the first embodiment includes the reinforcing plate 4, the reinforcing plate 4, and the reinforcing plate 4, which are provided with the leakage current blocking grooves RC cut to the outer peripheral portion along the current-carrying path regulating grooves SC of the windmill contacts 3, 7. 8 is fixed to the back surface of the windmill-shaped contacts 3,7. The grooves RC for preventing leakage current provided in the reinforcing plates 4 and 8 are arranged so as to match with the grooves SC for regulating the conducting paths of the windmill-shaped contacts 3 and 7 .

By forming the reinforcing plates 4 and 8 into the above-described shapes, leakage current flowing from the windmill blade portions WG of the windmill-shaped contacts 3 and 7 to the adjacent windmill blade portions WG via the reinforcing plates 4 and 8 at the time of current interruption can be reduced. Since the current flowing in the extending direction of the windmill blade portion WG in the windmill-shaped contacts 3 and 7 increases, the magnetic field generated in the radial direction of the contact becomes strong. As the magnetic field becomes stronger, the Lorentz force that drives the arc in the circumferential direction also becomes stronger, shortening the stagnation time from immediately after the current interruption until the arc starts to drive, and increasing the acceleration of the arc, resulting in improved interruption performance.

As shown in FIGS. 1 to 3, the vacuum valve in Embodiment 1 has the following configuration.
A windmill-shaped contact made up of a pair of movable side contacts 3 and fixed side contacts 7, which are housed in a vacuum vessel with one surface F1 facing each other and arranged removably, is provided. Each of the grooves SC has a current-carrying path regulating groove SC that extends from an outer peripheral end SCa in the outer peripheral portion to an inner end portion SCb in a curved manner in an inner diameter direction, and partitions and forms a plurality of juxtaposed wind turbine blade portions WG serving as individual contacts. At least one of the windmill-shaped contacts 3 and 7 has a leakage current blocking groove portion RC corresponding to the current-carrying path regulating groove portion SC. It is characterized in that a plate-like member made up of reinforcing plates 4 and 8 is provided for reinforcing the windmill-shaped contact. The leakage current blocking groove portion RC in the reinforcing member composed of the plate-shaped member including the reinforcing plates 4 and 8 is formed of a through groove, and corresponds to the conducting path regulating groove portion SC in the windmill-shaped contacts 3 and 7, and is formed in the outer peripheral portion. It curves and extends from the outer peripheral end RCa toward the inner diameter direction to the inner diameter end RCb.
The length dimension from the outer peripheral edge RCa to the inner diameter edge RCb of the leakage current blocking groove RC is the length from the outer peripheral edge SCa to the inner diameter edge SCb of the conducting path regulating groove SC in the windmill contacts 3 and 7. Identical to the dimensions. The width of the leakage current blocking groove RC can also be set to be the same as the width of the leakage current blocking groove RC or narrower than the width of the conducting path regulating groove SC.

That is, a vacuum insulated container 1 having a movable metal flange 12 and a fixed metal flange 6 fixed to both ends thereof, a fixed electrode rod 9 fixed to the fixed metal flange 6, and a bellows 11 and a bellows 11 to the movable metal flange 12. Movable side electrode rod 5 is provided to move back and forth through bellows cover 10; In a vacuum valve having windmill contacts 3 and 7 provided, reinforcing plates 4 and 8 provided with leakage current blocking grooves RC which are narrower than or equivalent to current path regulation grooves SC of windmill contacts 3 and 7. are arranged on the rear surfaces of the windmill-shaped contacts 3 and 7, respectively.

With this configuration, by providing the leakage current blocking groove portion RC in the reinforcing member composed of the reinforcing plates 4 and 8 provided in the windmill-shaped contacts 3 and 7, the leakage current due to the reinforcing member is reliably blocked, thereby improving the breaking performance. be able to.
That is, by opening the leakage current blocking grooves RC along the energization path control grooves SC of the windmill contacts 3 and 7 in the reinforcing plates 4 and 8 to the outer periphery, It is possible to eliminate leakage current flowing from the windmill blade portion WG of the shape contacts 3 and 7 to the adjacent windmill blade portion WG. In other words, compared to the case where the reinforcing plates 4 and 8 are fixed to the entire back surfaces of the windmill-shaped contacts 3 and 7, the current flowing in the extending direction of the windmill blade portion WG at the windmill-shaped contacts 3 and 7 becomes larger. , the breaking performance can be improved by increasing the magnetic driving force of the arc.
Further, when the width of the leakage current blocking groove portion RC is set narrower than the width of the current-carrying path regulating groove portion SC, it is possible to more reliably suppress the scattering of the metal spatter generated when the arc is extinguished. can ensure the insulating function of the insulating portion SR for a long period of time, contributing to the maintenance of the insulating performance.

Embodiment 2.
Embodiment 2 will be described with reference to FIGS. 4 and 5. FIG. 4(a) is a cross-sectional view showing the shape of the reinforcing plate in Embodiment 2, FIG. 4(b) is a perspective view, and FIG. 5(b) is a perspective view. The second embodiment has the same configuration as that of the first embodiment described above except for the specific configuration, and has the same effects.
The vacuum valve in Embodiment 2 includes an insulating container 1, a shield 2, a movable side contact 3, a movable side reinforcing plate 4, a movable side electrode rod 5, a fixed side metal flange 6, a fixed side contact 7, a fixed side reinforcing plate 8, It is composed of a fixed side electrode rod 9, a bellows cover 10, a bellows 11, a movable side metal flange 12, and a guide 13. The insulating portion SR of the insulating container 1 surrounds the outer circumferences of the movable side contact 3 and the fixed side contact 7 (see FIG. 1).

As shown in FIG. 4, the reinforcing plates 4 and 8 are made of a metal material (for example, stainless steel) stronger than the strength of the contact material. The leakage current blocking groove RC is cut up to the left, and the leakage current blocking groove RC is cut obliquely. Further, the reinforcing plates 4 and 8 are preferably arranged on both the fixed side and the movable side, but they may be arranged only on either side.
The leakage current blocking groove portion RC provided in the reinforcing member consisting of the reinforcing plates 4 and 8 is cross-sectionally perpendicular to the drawing, which is the contact/separation direction SD (see FIG. 1) between the windmill-shaped contact 3 and the windmill-shaped contact 7. It has an inclined shape, and has a sloped portion SL that faces the current-carrying path regulating groove SC and directs and disperses the metal spatter introduced from the current-carrying path regulating groove SC in the inner diameter direction when the arc is extinguished. be.
The windmill-shaped contact 3 and the reinforcing plate 4 are arranged as shown in FIG. 5(a), and the windmill-shaped contact 7 and the reinforcing plate 8 are arranged upside down from the state shown in FIG. 1).

As described above, the vacuum valve according to the second embodiment has a leakage current blocking groove RC cut along the energization path regulating groove SC of the windmill contacts 3 and 7 to the outer peripheral portion and having an inclined cross-sectional shape. A reinforcing plate 4 provided with is fixed to the contact back surfaces of the windmill-shaped contacts 3 and 7 . The grooves RC for preventing leakage current provided in the reinforcing plates 4 and 8 are arranged so as to match with the grooves SC for regulating the conducting paths of the windmill-shaped contacts 3 and 7 .

By shaping the reinforcing plates 4 and 8 as described above, leakage current flowing from the wind turbine blade portions WG of the contacts 3 and 7 to the adjacent wind turbine blade portions WG via the reinforcing plates 4 and 8 at the time of current interruption is eliminated. is possible, and the electric current flowing in the extending direction of the windmill blade portion WG of the contacts 3 and 7 increases, so that the magnetic field generated in the radial direction of the contacts becomes stronger. As the magnetic field becomes stronger, the Lorentz force that drives the arc in the circumferential direction also becomes stronger, shortening the stagnation time from immediately after the current interruption until the arc starts to drive, and increasing the acceleration of the arc, resulting in improved interruption performance. Moreover, since the cross-sectional shape of the leakage current blocking groove RC provided in the reinforcing plates 4 and 8 is inclined, it is possible to suppress scattering of metal spatter.

The vacuum valve according to the second embodiment has the following configuration applied to the configuration according to the first embodiment described above, as shown in FIGS.
The cross-sectional shape of the leakage current blocking groove RC provided in the reinforcing member consisting of the reinforcing plates 4 and 8 is inclined with respect to the contact/separation direction SD (see FIG. 1) of the windmill-shaped contacts 3 and 7. 7, and the leakage current blocking groove RC is formed in the conducting path regulating groove SC provided in the windmill-shaped contacts 3 and 7. It is characterized by having a slanted portion SL for directing and radiating the metal spatter introduced from the energizing path restricting groove portion SC when the opposing arc is extinguished in the inner diameter direction.
With this configuration, it is possible to suppress scattering of metal spatter to the insulating portion SR (see FIG. 1) of the insulating container 1 at the time of arc extinguishing. It contributes to the maintenance of

Embodiment 3.
Embodiment 3 will be described with reference to FIGS. 6 and 7. FIG. FIG. 6(a) is a cross-sectional view showing the shape of the reinforcing plate in Embodiment 3, FIG. 6(b) is a perspective view, and FIG. FIG. 7(b) is a perspective view. The third embodiment has the same configuration as that of the first embodiment described above except for the unique configuration, and has the same effects.
The vacuum valve of Embodiment 3 includes an insulating container 1, a shield 2, a movable side contact 3, a movable side reinforcing plate 4, a movable side electrode rod 5, a fixed side metal flange 6, a fixed side contact 7, a fixed side reinforcing plate 8, It is composed of a fixed side electrode rod 9, a bellows cover 10, a bellows 11, a movable side metal flange 12, and a guide 13. The insulating portion SR of the insulating container 1 surrounds the outer circumferences of the movable side contact 3 and the fixed side contact 7 (see FIG. 1).

As shown in FIG. 6, reinforcing plates 4 and 8 are made of a metal material (for example, stainless steel) stronger than the strength of the contact material as a base material, and extend along the energizing path restricting grooves SC of the windmill-shaped contacts 3 and 7 to the outer periphery. A cut leakage current blocking groove RC is provided. The leakage current blocking groove RC is formed by cutting and raising the reinforcing plates 4 and 8 and bending toward the electrode rods 5 and 9 to suppress metal spatter scattering. A bent portion BC is provided as a slanted portion having a slanted portion SL for the purpose. Further, the reinforcing plates 4 and 8 are preferably arranged on both the fixed side and the movable side, but they may be arranged only on either side.
The windmill-shaped contact 3 and reinforcing plate 4 are arranged as shown in FIG. 7(a), and the windmill-shaped contact 7 and reinforcing plate 8 are arranged upside down from the state shown in FIG. 7(a). (see Figure 1).

As described above, the vacuum valve according to the third embodiment is provided with the leakage current blocking groove RC that is cut to the outer peripheral portion along the current path regulating groove SC provided in the windmill contacts 3 and 7. Reinforcing plates 4 and 8 are fixed to the rear surfaces of the windmill-shaped contacts 3 and 7 . The leakage current blocking groove portion RC cuts the reinforcing plates 4 and 8 in the direction opposite to the windmill-shaped contacts 3 and 7 in the opening direction of the windmill-shaped contacts 3 in the contact/separation direction SD of the windmill-shaped contacts 3 and 7 (see FIG. 1). It is formed by a bent projecting portion BC that is raised and bent. The bent projecting portion BC extends obliquely with respect to the extending direction of the reinforcing plates 4 and 8 and projects in the direction opposite to the windmill-shaped contacts 3 and 7 . The grooves RC for preventing leakage current provided in the reinforcing plates 4 and 8 are arranged so as to match with the grooves SC for regulating the conduction paths of the windmill-shaped contacts 3 and 7 .

By forming the reinforcing plates 4 and 8 into the above-described shapes, leakage current flowing from the windmill blade portions WG of the windmill-shaped contacts 3 and 7 to the adjacent windmill blade portions WG via the reinforcing plates 4 and 8 at the time of current interruption can be reduced. The magnetic field generated in the radial direction of the windmill-shaped contacts 3 and 7 is strengthened by increasing the current flowing in the extending direction of the windmill blade portion WG at the windmill-shaped contacts 3 and 7 . As the magnetic field becomes stronger, the Lorentz force that drives the arc in the circumferential direction also becomes stronger, shortening the stagnation time from immediately after the current interruption until the arc starts to drive, and increasing the acceleration of the arc, resulting in improved interruption performance. In addition, by providing a bent portion BC as an inclined portion having a sloped portion SL bent in the direction of the electrode rods 5 and 9 in the current-carrying path regulating groove portion SC, scattering of metal spatter can be suppressed.

The vacuum valve according to the third embodiment has the following configuration applied to the configuration according to the first embodiment described above, as shown in FIGS. 6 and 7 .
The reinforcing member composed of the reinforcing plates 4 and 8 is formed of a plate-like material, and the leakage current blocking groove portion RC is formed by inserting the reinforcing member of a plate-like material in the contact/separation direction SD (see FIG. 1) of the windmill-shaped contacts 3 and 7. ) is a through groove that is opened by a bent portion BC that is cut and raised.
Further, the leakage current blocking groove RC formed by the bent portion BC faces the current-carrying path regulating groove SC and directs and dissipates the metal spatter introduced from the current-carrying path regulating groove SC during arc extinguishing in the radial direction. It has a sloped portion SL that allows
With this configuration, it is possible to easily form the required shape of the leakage current blocking groove RC provided in the reinforcing member composed of the reinforcing plates 4 and 8 by cutting and raising the plate material.
In addition, it is possible to suppress scattering of metal spatter to the insulating portion SR (see FIG. 1) of the insulating container 1 at the time of arc extinguishing. contribute to

Embodiment 4.
Embodiment 4 will be described with reference to FIGS. 8 and 9. FIG. FIG. 8(a) is a cross-sectional view showing the shape of the reinforcing plate in Embodiment 4, FIG. 8(b) is a perspective view, and FIG. FIG. 9(b) is a perspective view. The fourth embodiment has the same structure as that of the third embodiment described above except for the specific structure, and has the same effect.
The vacuum valve in the fourth embodiment includes an insulating container 1, a shield 2, a movable side contact 3, a movable side reinforcing plate 4, a movable side electrode rod 5, a fixed side metal flange 6, a fixed side contact 7, a fixed side reinforcing plate 8, It is composed of a fixed side electrode rod 9, a bellows cover 10, a bellows 11, a movable side metal flange 12, and a guide 13. The insulating portion SR of the insulating container 1 surrounds the outer circumferences of the movable side contact 3 and the fixed side contact 7 (see FIG. 1).

As shown in FIG. 8, reinforcing plates 4 and 8 are made of a metal material (for example, stainless steel) stronger than the strength of the contact material as a base material, and extend along the energizing path restricting grooves SC of the windmill-shaped contacts 3 and 7 to the outer peripheral portion. A cut leakage current blocking groove RC is provided, and the leakage current blocking groove RC is bent in the electrode rod direction and provided with an inclined portion having a slope portion SL for suppressing metal spatter scattering. Further, the reinforcing plates 4 and 8 are preferably arranged on both the fixed side and the movable side, but they may be arranged only on either side.
The windmill-shaped contact 3 and the reinforcing plate 4 are arranged as shown in FIG. 9(a), and the windmill-shaped contact 7 and the reinforcing plate 8 are arranged upside down from the state shown in FIG. 9(a). (see Figure 1).

The reinforcing member composed of the reinforcing plates 4 and 8 is provided with a protruding engaging portion BP formed by bending the inner diameter portion to be fitted into the protruding fitting portion PP protruding from the end face EF of the electrode rods 5 and 9. . The projecting engagement portions BP provided on the reinforcing plates 4 and 8 are engaged with the end faces EF of the electrode rods 5 and 9 to prevent leakage current between the reinforcing plates 4 and 8 and the end faces EF of the electrode rods 5 and 9. It sets a communication space AR that continues to the blocking groove RC.
The metal spatter generated when the arc is extinguished passes through the communication path AR of the windmill-shaped contacts 3 and 7 to the reinforcing plates 4 and 8 via the leakage current blocking grooves RC provided in the reinforcing plates 4 and 8. and the end faces EF of the electrode rods 5 and 9, thereby suppressing the scattering of metal spatter to the insulating portion SR in the insulating container 1.

By forming the reinforcing plates 4 and 8 into the above-described shapes, leakage current flowing from the windmill blade portions WG of the windmill-shaped contacts 3 and 7 to the adjacent windmill blade portions WG via the reinforcing plates 4 and 8 at the time of current interruption can be reduced. The magnetic field generated in the radial direction of the windmill-shaped contacts 3 and 7 is strengthened by increasing the current flowing in the extending direction of the windmill blade portion WG at the windmill-shaped contacts 3 and 7 . As the magnetic field becomes stronger, the Lorentz force that drives the arc in the circumferential direction also becomes stronger, shortening the stagnation time from immediately after the current interruption until the arc starts to drive, and increasing the acceleration of the arc, resulting in improved interruption performance. In addition, by providing a communicating space AR communicating with the leakage current blocking groove portion RC between the reinforcing plates 4 and 8 and the end faces EF of the electrode rods 5 and 9, the communicating space AR absorbs the metal spatter generated when the arc is extinguished. and the scattering of metal spatters can be suppressed.

The vacuum valve according to the fourth embodiment has the following configuration applied to the configuration according to the third embodiment, as shown in FIGS. 8 and 9 .
The reinforcing member consisting of the reinforcing plates 4 and 8 faces the end faces of the electrode rods 5 and 9 supporting the windmill-shaped contacts 3 and 7, and the windmill-shaped contacts 3 and 7 and the electrode rods 5 and 9 are opposed to each other. and the protruding engaging portion BP protruding from the inner diameter portion is engaged with the end surface EF of the electrode rods 5 and 9, and the reinforcing member consisting of the reinforcing plates 4 and 8 and the end faces EF of the electrode rods 5, 9, a communicating space AR is set to communicate with the leakage current blocking groove RC.
With this configuration, it is possible to suppress scattering of metal spatter to the insulating portion SR (see FIG. 1) of the insulating container 1 at the time of arc extinguishing. It contributes to the maintenance of

Embodiment 5.
Embodiment 5 will be described with reference to FIGS. 10 and 11. FIG. FIG. 10(a) is a cross-sectional view showing the assembly structure of the reinforcing plate and the pinwheel-shaped contact in Embodiment 52, and FIG. 11(b) is a perspective view. This Embodiment 5 has the same configuration as the configuration in the above-described Embodiment 1 except for the specific configuration, and has the same effects.
The vacuum valve in Embodiment 5 comprises an insulating container 1, a shield 2, a movable contact 3, a movable reinforcing plate 4, a movable electrode rod 5, a fixed metal flange 6, a fixed contact 7, a fixed reinforcing plate 8, It is composed of a fixed side electrode rod 9, a bellows cover 10, a bellows 11, a movable side metal flange 12, and a guide 13. The insulating portion SR of the insulating container 1 surrounds the outer circumferences of the movable side contact 3 and the fixed side contact 7 (see FIG. 1).

As shown in FIG. 10, reinforcing plates 4 and 8 are made of a metal material (for example, stainless steel) stronger than the strength of the contact material as a base material, and are cut along the energizing path restricting grooves SC of the windmill-shaped contacts 3 and 7 to the outer periphery. A leak current blocking groove RC is provided. The leakage current blocking groove RC in the reinforcing plates 4 and 8 has a two-step structure, the first step is provided with a groove portion wider than the width of the current-carrying path regulating groove SC that does not penetrate the reinforcing plates 4 and 8, and the second step is provided with is provided with a groove portion penetrating through the reinforcing plates 4 and 8 at a position hidden behind the back surface of the contact. Further, the reinforcing plates 4 and 8 are preferably arranged on both the fixed side and the movable side, but they may be arranged only on either side.
The windmill-shaped contact 3 and reinforcing plate 4 are arranged as shown in FIG. 11(a), and the windmill-shaped contact 7 and reinforcing plate 8 are arranged upside down from the state shown in FIG. 11(a). (see Figure 1).

As described above, the vacuum valve according to the fourth embodiment includes the reinforcing plate 4, which is provided with the leakage current blocking groove RC that is cut to the outer peripheral portion along the current path regulating groove SC of the windmill contacts 3, 7. 8 is fixed to the back surface of the windmill-shaped contacts 3,7. The grooves RC for preventing leakage current provided in the reinforcing plates 4 and 8 are arranged so as to match with the grooves SC for regulating the conduction paths of the windmill-shaped contacts 3 and 7 .
The leakage current blocking groove RC is provided with a stepped portion SP having a step in the width direction, and the leakage current blocking is performed on one surface of the reinforcing member composed of the reinforcing plates 4 and 8 facing the windmill-shaped contacts 3 and 7. The width W2 of the opening R2 in the leakage current blocking groove RC on the other surface of the reinforcing member is narrower than the width W1 of the opening R1 in the groove RC.
Then, the opening R2 of the leakage current blocking groove RC on the other surface of the reinforcing member is arranged at a radial position on the inner diameter side of the conducting path regulating groove SC, and the opening R2 is positioned closer to the conducting path regulating groove SC than the conducting path regulating groove SC. It is configured to open at the inner diameter position.

By forming the reinforcing plates 4 and 8 into the above-described shapes, leakage current flowing from the windmill blade portions WG of the windmill-shaped contacts 3 and 7 to the adjacent windmill blade portions WG via the reinforcing plates 4 and 8 at the time of current interruption can be reduced. Since the current flowing in the extending direction of the windmill blade portion WG in the windmill-shaped contacts 3 and 7 increases, the magnetic field generated in the radial direction of the contact becomes strong. As the magnetic field becomes stronger, the Lorentz force that drives the arc in the circumferential direction also becomes stronger, shortening the stagnation time from immediately after the current interruption until the arc starts to drive, and increasing the acceleration of the arc, resulting in improved interruption performance. In addition, by making the grooves provided in the reinforcing plates 4 and 8 into a two-stage structure, leakage current flows from the windmill blade portions WG of the windmill-shaped contacts 3 and 7 to the adjacent windmill blade portions WG via the reinforcing plates 4 and 8. can be eliminated, and scattering of metal spatters can be suppressed.

10 and 11, the following configuration is applied to the vacuum valve of the fifth embodiment in any one of the configurations of the first to fourth embodiments described above.
A stepped portion SP for forming a step in the width direction is provided in the leakage current blocking groove portion RC provided in the reinforcing member composed of the reinforcing plates 4, 8, and the windmill-shaped contacts 3, 7 in the reinforcing member composed of the reinforcing plates 4, 8. The width W2 of the leakage current blocking groove RC on the other side of the reinforcing member is narrower than the width W1 of the leakage current blocking groove RC on the one side facing the reinforcing member.
That is, a stepped portion SP is provided in the leakage current blocking groove RC provided in the reinforcing member composed of the reinforcing plates 4 and 8 to form a two-step structure. It is characterized by providing a groove that is wider than the contact, and in the second stage, a groove that penetrates the reinforcing plate at a position hidden behind the contact.
Further, the width W1 at the opening R1 of the leakage current blocking groove RC on one surface facing the windmill-shaped contacts 3 and 7 in the reinforcing member composed of the reinforcing plates 4 and 8 is determined by the windmill-shaped contacts 3 and 7. and the opening R2 of the leakage current blocking groove RC on the other surface of the reinforcing member is arranged on the inner diameter side of the conducting path regulating groove SC. However, with this configuration, it is possible to suppress the scattering of metal spatter to the insulating portion SR (see FIG. 1) in the insulating container 1 at the time of arc extinguishing, The insulating function of the insulating portion SR of the insulating container 1 can be ensured for a long period of time, contributing to maintaining the insulating performance.
Further, by opening the opening R2 of the leakage current blocking groove RC at an inner diameter position from the conducting path regulating groove SC, the effect of suppressing scattering of metal spatter to the insulating portion SR in the insulating container 1 at the time of arc extinguishing is suppressed. can be done more effectively.

It should be noted that, within the technical scope of the disclosed matter as the technical concept of this application, the embodiments can be freely combined, and each embodiment can be appropriately modified or omitted.

1 insulating container, 2 shield, 3 movable side contact (windmill type contact), 4 (moving side) reinforcing plate, 5 (moving side) electrode rod, 6 fixed side metal flange, 7 fixed side contact (windmill type contact), 8 (Fixed side) reinforcing plate, 9 (fixed side) electrode bar, 10 bellows cover, 11 bellows, 12 movable side metal flange, 13 guide.

Claims (8)

A pair of windmill-shaped contacts are provided in the vacuum vessel so that one surfaces face each other and are arranged to be able to contact and separate from each other. At least one of the windmill-shaped contacts has a leakage current blocking groove corresponding to the current-carrying path-regulating groove. A reinforcing member is provided to reinforce the contact, and the width of the leakage current blocking groove in the reinforcing member is formed narrower than the width of the conducting path regulating groove of the windmill-shaped contact. vacuum valve. A pair of windmill-shaped contacts are provided in the vacuum vessel so that one surfaces face each other and are arranged to be able to contact and separate from each other. At least one of the windmill-shaped contacts has a leakage current blocking groove corresponding to the current-carrying path-regulating groove. A reinforcing member is provided to strengthen the contact, and the leakage current blocking groove provided in the reinforcing member faces the conducting path regulating groove provided in the windmill contact and acts to regulate the conducting path when the arc is extinguished. 1. A vacuum valve characterized by having a slant portion for directing metal spatter introduced from a groove portion in an inner diameter direction. A pair of windmill-shaped contacts are provided in the vacuum vessel so that one surfaces face each other and are arranged to be able to contact and separate from each other. At least one of the windmill-shaped contacts has a leakage current blocking groove corresponding to the current-carrying path-regulating groove. A reinforcing member is provided to strengthen the contact, the reinforcing member is formed of a plate-shaped material, and the leakage current blocking groove is formed by cutting and raising the reinforcing member made of a plate-shaped material in the direction of contact and separation of the windmill-shaped contact. A vacuum valve comprising a formed through groove. A pair of windmill-shaped contacts are provided in the vacuum vessel so that one surfaces face each other and are arranged to be able to contact and separate from each other. At least one of the windmill-shaped contacts has a leakage current blocking groove corresponding to the current-carrying path-regulating groove. A reinforcing member is provided to strengthen the contact, and the reinforcing member is provided between the windmill-shaped contact and the electrode rod so that the inner diameter faces the end surface of the electrode rod that supports the windmill-shaped contact. Then, a protruding engaging portion protruding from the inner diameter portion is engaged with the end surface of the electrode rod to form a communication space between the reinforcing member and the end surface of the electrode rod, which is connected to the leakage current blocking groove. A vacuum valve characterized by setting A pair of windmill-shaped contacts are provided in the vacuum vessel so that one surfaces face each other and are arranged to be able to contact and separate from each other. At least one of the windmill-shaped contacts has a leakage current blocking groove corresponding to the current-carrying path-regulating groove. A reinforcing member is provided to reinforce the contact, a stepped portion is provided to form a widthwise step in the leakage current blocking groove, and the leakage current blocking groove is formed on one surface of the reinforcing member facing the windmill-shaped contact. A vacuum valve, wherein the width of the leakage current blocking groove portion on the other surface of the reinforcing member is narrower than the width of the reinforcing member. The width of the leakage current blocking groove on one surface of the reinforcing member facing the windmill-shaped contact is made wider than the width of the current-carrying path restricting groove on the windmill-shaped contact, and 6. The vacuum valve according to claim 5, wherein the opening of the leakage current blocking groove on the surface is opened at an inner diameter position relative to the conducting path regulating groove. 7. The vacuum valve according to any one of claims 1 to 6 , wherein the material of said reinforcing member is a metal material having strength greater than that of said windmill contact. The leakage current blocking groove portion of the reinforcing member is formed of a through groove, and is curved and extends from the outer peripheral portion toward the inner diameter direction in correspondence with the current-carrying path restricting groove portion of the windmill-shaped contact. Vacuum valve according to any one of claims 1 to 7 .

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