JP2003197075A - Vacuum switch tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum switch tube with reduced diameters of make and break electrodes of a composition housed in an insulating container with main electrodes of the pair of make and break electrodes facing each other and applying a vertical magnetic field to a contact part. <P>SOLUTION: In a composition of the pair of make and break electrodes, the main electrodes are attached to a one end side of an electrode rod via supporting members with pluralities of conductors wrapped around outer circumferences and forming coil parts generating the longitudinal magnetic field, the radial thickness of each coil part of the pair of make and break electrodes is made thinner than an axial height, and the radial center of the coil part is positioned near an outer circumference side. By such a composition, an area of the longitudinal magnetic field of the contact parts of the main electrodes is widened, and the diameters of the make and break electrodes can be reduced. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum switch tube for a vacuum circuit breaker used for opening and closing a power circuit.

[0002]

2. Description of the Related Art A vacuum switch tube of a vacuum circuit breaker used for opening and closing a conventional power circuit is disclosed in, for example, Japanese Patent Laid-Open No. 9-1533.
There is one shown in FIG. 8 and FIG. FIG. 8 is a sectional view showing an electrode arrangement in a state where a pair of open / close electrodes composed of a fixed side electrode and a movable side electrode are separated, and FIG. 8 (a) is a sectional view taken along the line BB in FIG. (B) is a cross-sectional view of AA shown in (a) in the lateral direction of the open / close electrode. Figure 9
FIG. 4 is an exploded view showing the shape of each part of the open / close electrode. In FIGS. 8 and 9, 3 is a main electrode, 5 is an electrode rod connected to an external circuit, and 4 is a support member that supports the main electrode 3 arranged between one end of the electrode rod 5 and the main electrode 3. , Four conductors extending from one end of the electrode rod 5 to the outer peripheral direction and a coil portion 4b that circulates from the tip of each arm portion 4a along the outer periphery of the main electrode 3 are formed. The end 4c of 4b is connected to the main electrode 3.

1 is a fixed electrode, 2 is a movable electrode,
Each is composed of a main electrode 3, a support member 4, and an electrode rod 5. The fixed-side electrode 1 and the movable-side electrode 2 are arranged such that the main electrodes 3 face each other and are housed in an insulating container (not shown), and the fixed-side electrode 1 is fixedly attached to one end side of the insulating container. The electrode 2 is attached to the other end side of the insulating container via a bellows or the like so that the main electrode 3 can be contacted and separated. Reference numeral 10 between the fixed electrode 1 and the movable electrode 2 is a discharge space in which an arc is generated between the main electrodes 3. The shape of each member is as shown in the exploded view of FIG. The inside of the insulating container is maintained in a vacuum state.

The current flowing through the vacuum switch tube constructed as described above flows into the main electrode 3 from the electrode rod 5 through the arm portion 4a, the arm portion 4a, the coil portion 4b, and the movable side in the fixed side electrode 1. In the portion of the electrode 2, the current flows from the main electrode 3 through the arm portion 4a and the coil portion 4b of the supporting member 4 and into the electrode rod 5. Since the coil portion 4b is formed so that the coil portions 4b of the fixed-side electrode 1 and the movable-side electrode 2 circulate around the outer circumference in the same direction, the main electrode 3 faces each other by the current flowing through the coil portion 4b. An axial magnetic field, that is, a longitudinal magnetic field is generated in the portion.

When the vacuum switch tube operates and the main electrode 3 is separated, an arc is generated in the direction of the longitudinal magnetic field between the main electrodes 3. The magnetic flux density of the longitudinal magnetic field of the arc is 5 mT / k.
If it is A (50 gauss / kA) or more, it has a characteristic of diffusing on the facing surface of the main electrode 3, and the magnetic flux density of the vertical magnetic field diffused by the arc varies depending on the material of the electrode, the separation distance of the discharge space, etc. In the switch tube, it is said that the arc will diffuse if the strength of the longitudinal magnetic field is about 5 mT / kA (50 gauss / kA) to 13 mT / kA (130 gauss / kA). Therefore, a longitudinal magnetic field of 5 mT
By securing about / kA to 130 mT / kA, the arc generated between the main electrodes 3 is diffused in the discharge space 10, a local temperature rise of the contact surface of the main electrode 3 is avoided, and the breaking performance is secured.

In the structures shown in FIGS. 8 and 9, a longitudinal magnetic field in the axial direction is generated on the facing surface of the main electrode 3 by the coil portion 4b of the supporting member 4, but the magnetic field generated by the current of the arm portion 4a is generated by the coil portion. It is perpendicular to the direction of the magnetic field due to the current of 4b, and has the effect of changing the longitudinal magnetic field. Further, since the coil portion 4b for generating a longitudinal magnetic field is not arranged between the tip of the arm portion 4a and the portion of the adjacent coil portion 4b connected to the main electrode 3, a longitudinal magnetic field is generated between the main electrodes 3 in that portion. Is getting weaker.

Further, in Japanese Laid-Open Patent Publication No. 9-153319, in the configuration of FIGS. 8 and 9, the configuration of FIG. 10 in which the influence of the arm portion 4a that deforms the longitudinal magnetic field generated in the discharge space 10 is reduced is also provided. It is shown. 10, the main electrode 3 and the electrode rod 5 are the same as those in FIGS. 8 to 9. Reference numeral 11 is a fixed side electrode, and 12 is a movable side electrode. A plurality of arm portions 14a protrude from the end portion of the electrode rod 5, respectively, to form a coil portion 14b that circulates on the outer peripheral portion of the main electrode 3, and a coil portion 14b The end portion 14c is connected to the outer peripheral portion of the main electrode 3.

The fixed electrode 11 and the movable electrode 12 shown in FIG.
Is the height from the contact surface of the main electrode 3 of the coil portion 14b to h
_1, when the height h ₂ from the contact surface of the arm portion 14a, FIG. 8, as compared with the case of FIG. 9, by increasing the h ₂ with respect to h _1, the position of the arm portion 4a of the main electrode 3 contacting surface It is a position away from. With this configuration, the current flowing through the arm portion 14a flows at a position axially separated from the main electrode 3 as compared with the configurations of FIGS.
The influence of the magnetic field due to the current of 4a on the longitudinal magnetic field is reduced. The radial magnetic field distribution in the radial direction in the configurations of FIGS. 8, 9 and 10 is as shown in FIG. That is, FIG.
The maximum value of the intensity of the vertical magnetic field in the configuration is slightly reduced as compared with the configuration in FIG. 8, but the distribution of the electrodes in the radial direction is uniform, and the range in which a strong vertical magnetic field is generated is wide near the outer peripheral portion. . When the region where the longitudinal magnetic field is generated is widened, the diffusion range of the arc is widened, the breaking capacity between the main electrodes 3 is increased, the contact surface is less damaged, and the breaking performance is improved.

[0009]

In the structure of the conventional vacuum switch tube having the above-described structure shown in FIG. 10, the arm portion 14a connected to the coil portion 14b is disposed away from the main electrode 3 and the longitudinal magnetic field is increased. Has less effect on. However, the coil portion 14b has a large thickness, and the current flowing through this portion has a central position near the middle of the radial thickness.
The inside of the center of the conductor of the coil portion 14b is the region where the vertical magnetic field is generated, and the outer peripheral portion of the main electrode 3 has a weak vertical magnetic field that diffuses the arc. Therefore, the contact surface of the main electrode 3 has a structure in which the corner is chamfered to limit the region where the arc is generated in order to generate the arc in the longitudinal magnetic field. Therefore, there is a problem that the outer diameter of the main electrode 3 becomes larger than the diameter of the contact surface in accordance with the thickness of the coil portion conductor 4b.

Further, in the conventional coil portion for generating the longitudinal magnetic field of the vacuum switch tube, there is a conductor cut between the coil portion 14b adjacent to each of the plurality of coil portions 14b which circulates the outer peripheral portion. The part is a region where the longitudinal magnetic field is weak, and when an arc occurs in this region, the arc stays without diffusion, a local temperature rise occurs, the generation density of metal vapor increases, and the breaking performance decreases. There was also a problem.

The present invention has been made in order to solve the above problems, and suppresses the influence of the arm portion on the vertical magnetic field while the generation region of the vertical magnetic field is on the outer peripheral side of the contact surface of the main electrode, Another object of the present invention is to provide a vacuum switch tube having improved cut-off performance by eliminating breaks in a coil portion for generating a vertical magnetic field to eliminate a region where the vertical magnetic field is weak.

[0012]

In a vacuum switch tube according to claim 1 of the present invention, the radial thickness of each coil portion of a pair of open / close electrodes is made thinner than the axial height, and the coil portion The center of the radial direction is located on the outer peripheral side.

In the vacuum switch tube according to a second aspect of the present invention, the coil portions of the pair of open / close electrodes having the structure according to the first aspect have an average radial thickness on the main electrode side and an average thickness on the anti-main electrode side. It is thinner than the diameter and has a larger average diameter.

According to a third aspect of the present invention, in the vacuum switch tube according to the second aspect, the cross-sectional shape of the coil portion is a trapezoid in which the radial thickness on the main electrode side is thinner than the thickness on the non-main electrode side. It is formed in the cross section.

According to a fourth aspect of the present invention, in the vacuum switch tube according to the second aspect, the coil portion has a stepped structure in which the main electrode side has a thin portion which is thinner than the thickness of the opposite main electrode side. It is formed into a shape.

In the vacuum switch tube according to a fifth aspect of the present invention, each conductor forming each coil portion of the pair of open / close electrodes has an arm portion radially extended from an electrode rod of an adjacent coil portion. Is connected so that the portion connected to the main electrode of the coil portion adjacent to the portion connected to is overlapped when viewed in the axial direction.

According to a sixth aspect of the present invention, in the vacuum switch tube according to the fifth aspect, the conductors forming the respective coil portions of the pair of open / close electrodes are inclined at positions overlapping the conductors of the adjacent coil portions. Are arranged and connected to the main electrode.

In the vacuum switch tube according to a seventh aspect of the present invention, the support members for the pair of open / close electrodes are formed into a coil portion that circulates around the outer periphery by cutting a cylindrical conductive member in a plurality of oblique directions. A structure in which a support disc is attached to the inner diameter on one end side of the coil part, the center part of this support disc is connected to one end side of the electrode rod, and the main electrode is attached to the other end side of the support disc. Is.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. The configuration of the first embodiment is shown in FIG. The first embodiment has a configuration in which the radial thickness of each coil portion of the pair of open / close electrodes is made thinner than the axial height, and the radial center of the coil portion is positioned on the outer peripheral side. . In the figure, 23 is a main electrode, 25 is an electrode rod connected to an external circuit, 24 is a support member that supports the main electrode 23 arranged between one end of the electrode rod 25 and the main electrode 23, and the electrode rod 25 The three conductors from one end of the arm 24a toward the outer peripheral direction, and the coil portion 24b that circulates the outer periphery from the tip of the arm portion 24a is formed.
4b is connected to the main electrode 23 at the end 24c.
Reference numeral 21 denotes a fixed side electrode, and 22 denotes a movable side electrode, each of which is composed of a main electrode 23, a support member 24, and an electrode rod 25. The main electrode 23 is formed of a material such as a CuCr-based material having excellent arc resistance or an AgWC-based material of a low surge contact material, and the supporting member 24 and the electrode rod 25 are formed of oxygen-free copper having good conductivity. . Reference numeral 26 is an electrode support that supports between the end portion of the electrode rod 25 and the main electrode 23. The electrode support 26 supports the main electrode 23 so as not to deform in the closed state, and is made of stainless steel or an insulating material having mechanical strength. It is formed by. Reference numeral 20 is a discharge space in which an arc is generated when the pair of open / close electrodes are opened.

The pair of open / close electrodes are each the main electrode 23.
Are opposed to each other and housed in an insulating container (not shown), one of which is a fixed electrode 21 fixed to the insulating container, and the other of which is a movable electrode 22 supported by a bellows or the like so as to reciprocate in the axial direction. The inside of the insulating container is kept in a vacuum state.

The configuration of FIG. 1 has a coil portion 2 of the support member 24.
The thickness t of 4b in the radial direction is made thinner than the height h in the axial direction,
The configuration is such that the radial center of the coil portion is located on the outer peripheral side.

The electric current of the vacuum switch tube of FIG. 1 constructed as described above flows from the electrode rod 25 through the arm portion 24a to the coil portion 24b at the fixed side electrode 21 to pass through the main electrode 2
3 and flows from the main electrode 23 to the electrode rod 25 through the arm portion 24a of the supporting member 24 and the coil portion 24b at the movable side electrode 22. In this way, the coil portions 24b of the fixed-side electrode 21 and the movable-side electrode 22 are formed so as to circulate around the outer circumference in the same direction, and the current flowing through the coil portions 24b causes the axial direction of the contact portion of the main electrode 23. A vertical magnetic field is generated in the.

In this structure, the coil portion 2 of the support member 24 is
The cross-sectional shape of 4b has a thickness t in the radial direction smaller than the height h in the axial direction, and the height h is increased to secure the cross-sectional area. As compared with the case of the configuration of FIG.
The range of the longitudinal magnetic field generated on the contact surface of is wide. Moreover, since the position of the arm portion 24a is located away from the contact surface of the main electrode 23, the magnetizing force that deforms the longitudinal magnetic field by the current of the arm portion 24a is weakened, and the conventional FIG.
The area of the vertical magnetic field in which the arc diffuses on the contact surface of the main electrode 23 is wider than in the above case, and the influence of the arm portion 24a on the vertical magnetic field is reduced.

In this structure, when the vacuum switch tube operates to open the main electrode 23, the arc generated between the main electrodes 23 spreads over a wider range than in the conventional structure of FIG. The tube blocking performance is improved. Also, when the area of the longitudinal magnetic field with respect to the main electrode becomes wider, the diameter of the main electrode can be made smaller than that of the conventional configuration when securing the area of the longitudinal magnetic field of the required strength, and the opening / closing electrode can be downsized. Becomes

If the coil portions 24b of the fixed-side electrode 21 and the movable-side electrode 22 are arranged so that the connection positions of the main electrode 23 are overlapped with each other, the peak value of the longitudinal magnetic field generated in the discharge space 20 will be high, and the coil portion 24b and the main electrode 23 will be high. When the connection position with the electrode 23 is displaced, the longitudinal magnetic field is evenly distributed. However, in the configuration of FIG. 1, the thickness t of the coil portion 24b is thin, so that the coil portion 24b and Even if the connection positions with the electrodes 23 are arranged so as to overlap with each other, the area in which the arc diffuses is large, so that the blocking effect is increased.

The electrode support 26 is used for the purpose of reinforcing that the thickness t of the coil portion 24b in the radial direction is thinner than the height in the axial direction so that the electrode support 26 is easily deformed by impact force or contact pressure at the time of opening / closing. However, the shape is not limited to the shape shown in the figure. If the coil portion 24b is formed in a cylindrical shape that is inscribed in the coil portion 24b so as to be integrated with the coil portion 24b, the coil portion 24b is deformed into a circular shape. Therefore, the uniformity of the magnetic field distribution is prevented from being impaired. Further, by selecting a material having a lower conductivity than the material of the coil portion 24b as the material of the electrode support 26, the current is not shunted to this portion, and the uniformity of the magnetic field generated by the coil portion 24b is impaired. Will disappear. In addition, when the electrode support 26 is made of a magnetic material, the strength of the magnetic field in the discharge space 20 is increased.

Embodiment 2. FIG. 2 is a sectional view of the coil portion of the support member according to the second embodiment. In the first embodiment, the cross-sectional shape of the coil portion 24b of the support member 24 has a thickness t in the radial direction.
Is made thinner than the height h in the axial direction, and the radial center of the coil portion is located on the outer peripheral side. To secure the necessary cross-sectional area, the height h of the coil portion 24b is increased. Therefore, there is a problem that the length of the vacuum switch becomes long.
In the second embodiment, the conductor cross-sectional area can be secured without increasing the height h of the coil portion so much.

[0028] In FIG. 2, 34b is a coil portion of the support member, by increasing the thickness t ₂ on the opposite side with respect to the thickness t ₁ of the main electrode side, the required cross-sectional form a cross-section trapezoidal The area is secured. By thus forming the cross section of the coil portion 34b into a trapezoidal shape and thinning the thickness on the main electrode side, the current that gives the longitudinal magnetic field to the contact surface of the main electrode is on the outer diameter side,
The range of the longitudinal magnetic field on the contact surface of the main electrode 23 can be expanded to the outer diameter side, and the required cross-sectional area can be secured without making the coil height h too high.

Embodiment 3. FIG. 3 shows the support of the third embodiment.
It is sectional drawing of the coil part of a member. The third embodiment is a carp.
The cross section of the ruled part is not trapezoidal but has a stepped shape.
is there. In the figure, 44b is a coil portion of the support member.
The radial thickness t on the side facing the main electrode 23. ₁Outer diameter
Formed into a stepped shape with a thinned portion 44d on the side
There is.

As described above, by providing the thin portion 44d in which the radial thickness of the coil portion 44b on the main electrode 23 side is reduced on the outer diameter side, the coil portion 44b is formed as in the second embodiment.
It is possible to construct a vacuum switch tube in which the required cross-sectional area is secured without increasing the height of the vacuum switch, and the required magnetic flux density of the longitudinal magnetic field can be secured without increasing the length of the vacuum switch.

Fourth Embodiment In the fourth embodiment, the circumference of each coil portion that applies a longitudinal magnetic field to the contact portion of the main electrode is lengthened so that the portion connected to the tip of the arm portion and the portion connected to the main electrode of the adjacent coil portion are arranged in the axial direction. Configure so that they overlap when viewed,
The configuration is such that a uniform longitudinal magnetic field is applied to the entire contact surface of the main electrode. FIG. 4 shows a development view of the coil portion according to the fourth embodiment as viewed from the outer peripheral side. In FIG. 4, the coil portion is 4
It shows two cases. The main electrode 23 and the electrode rod 25 having this structure are the same as those in the first embodiment. In FIG. 4, reference numeral 54 is a support member, 54a is an arm portion provided on the support member 54, and 54b is a coil portion. The coil portion 54b is
The coil portion 54 adjacent to the portion connected to the tip of the arm portion 54a
The portion of b that is connected to the main electrode is arranged so as to overlap when viewed from the axial direction, and it circulates in proximity to the main electrode 23 from the position beyond the connecting portion, and is connected to the main electrode 23 at the end face 54c. It is a composition.

When the coil portion 54b is constructed in this way,
A coil portion 54b that generates a vertical magnetic field is arranged around the entire circumference of the main electrode 23, a uniform vertical magnetic field is generated over the entire contact surface of the main electrode 23, and the arc generated when the contact is opened is locally generated. It will spread over the entire surface without stagnation, and a stable blocking performance can be secured.

Embodiment 5. In the fifth embodiment, similarly to the fourth embodiment, the circumference of each coil portion that applies a longitudinal magnetic field to the contact portion of the main electrode is extended and the portion connected to the arm portion is connected to the main electrode of the adjacent coil portion. The coil is wound from the position where it overlaps with the part to be connected, and the connection part between the end of the coil part and the main electrode is arranged in the tilt direction so that a magnetomotive force that generates a longitudinal magnetic field is applied from the entire circumference. is there. FIG. 5 shows a development view of the coil portion according to the fifth embodiment as viewed from the outer peripheral side. FIG. 5 shows the case where there are four coils.

The main electrode 23 and the electrode rod 25 having this structure are the same as those in the first embodiment. In FIG. 5, 64a is an arm portion provided on the support member, 64b is a coil portion, and the coil portion 64b has a portion connected to the tip of the arm portion 64a and a portion connected to the main electrode 23 of the adjacent coil portion 64b. They are arranged so as to overlap each other when viewed from the axial direction, and from the position beyond the connecting portion, they circulate close to the main electrode 23, and the end surface 64
The configuration is such that it is connected to the main electrode 23 by c.

When the coil portion 64b is constructed in this way,
Since the end portion of the coil portion 64b and the connection portion of the main electrode 23 are arranged in the inclined direction and connected, a configuration having a magnetomotive force for generating a longitudinal magnetic field over the entire circumference of the main electrode is obtained. Since the portion of the coil portion 64b connected to the main electrode 23 is inclined, the magnetic field in this portion becomes a magnetic field in the inclination direction including the component in the perpendicular direction, and when an arc is generated in this portion, it moves to the longitudinal magnetic field portion and diffuses. Therefore, as in the case of the fourth embodiment, a uniform longitudinal magnetic field that spreads over the entire contact surface of the main electrode 23 is applied, and the arc generated at the time of opening does not locally stay on the entire surface. It becomes a structure that diffuses and can secure stable blocking performance.

In this structure, since the magnetomotive force for generating the longitudinal magnetic field is uniform over the entire circumference of both the fixed side electrode and the movable side electrode, the coil portion 64b of the movable side electrode and the fixed side electrode is connected to the main electrode 23. Even if it is assembled without confirming the position, the structure can ensure the uniformity of the longitudinal magnetic field.

Sixth Embodiment FIG. 6 shows a sectional view of the configuration of the sixth embodiment, and FIG. 7 shows a developed view of the coil portion. 6 and 7
In the electrode rod 25 and the main electrode 23,
Is the same as 74 is a coil unit for generating a longitudinal magnetic field, and 75
Is a support disk that supports the coil portion 74 on the electrode rod 25. Reference numeral 71 is a fixed side electrode, and 72 is a movable side electrode, each of which is composed of an electrode rod 25, a coil portion 74, a main electrode 23 and a support disk 75. As shown in the development view of FIG. 7, the coil portion 74 is formed so that the cut portion 74a is processed in the inclined direction so that the electric current circulates around the outer circumference, and the cut portion 74a is processed by using a cylindrical material made of a conductive material. The coil portion 74b can be formed by processing the cut portions 74a as a material at predetermined intervals in the inclination direction. Each member is connected by silver brazing or the like.

With this structure, the coil portions 74b of the support member 74 are evenly arranged over the entire circumference without discontinuity of the coil portions, and a uniform longitudinal magnetic field is applied to the entire contact surface of the main electrode 23. . This structure has a simple shape and good workability.

In a vacuum switch tube having a small breaking current, the electrode rod 25 and the main electrode 23 may have substantially the same diameter. In this case, the supporting disk 75 is not used and the coil portion 74 is directly attached to the electrode portion 25. It will be composed. In this case, since there is no current flowing through the supporting disk, the uniformity of the longitudinal magnetic field becomes more uniform. In this configuration as well, it is considered that the main electrode 23 is deformed due to the impact force and the pressing force at the time of opening / closing. Therefore, by providing the electrode support as in the first embodiment, the deformation of the coil portion can be suppressed.

[0040]

In the vacuum switch tube according to claim 1 of the present invention, the radial thickness of each coil portion of the pair of open / close electrodes is made thinner than the axial height, and the radial center of the coil portion is formed. Is located on the outer peripheral side, the area of the vertical magnetic field of the contact portion of the main electrode is widened, and the distortion of the vertical magnetic field due to the current of the arm portion of the support member is suppressed. On the other hand, the outer diameter can be reduced.

According to a second aspect of the present invention, in the vacuum switch tube, the coil portions of the pair of open / close electrodes of the first aspect are arranged such that the radial thickness on the main electrode side is smaller than the thickness on the anti-main electrode side. Since the thickness of the coil portion is made thinner and the average diameter is made larger, the height of the coil portion is not increased so much that the region of the vertical magnetic field is wide.

According to a third aspect of the present invention, in the vacuum switch tube according to the second aspect, the cross-sectional shape of the coil portion is a trapezoid in which the radial thickness on the main electrode side is thinner than the thickness on the non-main electrode side. Since it is formed in the cross section, the height of the coil portion is not increased so much that the region of the vertical magnetic field is wide.

According to a fourth aspect of the present invention, in the vacuum switch tube according to the second aspect, the cross-sectional shape of the coil portion is stepped by providing a thin portion in which the main electrode side is thinner than the thickness on the opposite main electrode side. Since it is formed in a shape, the region of the vertical magnetic field is wide without increasing the height of the coil portion.

In the vacuum switch tube according to a fifth aspect of the present invention, each conductor forming each coil portion of the pair of open / close electrodes has an arm portion radially extended from an electrode rod of an adjacent coil portion. Since the structure is such that the part connected to the main electrode and the part connected to the main electrode of the adjacent coil part overlap with each other when viewed from the axial direction, a uniform longitudinal magnetic field is applied to the entire surface of the main electrode, and a vacuum with stable breaking performance is provided. A switch tube is obtained.

According to a sixth aspect of the present invention, in the vacuum switch tube, the conductors forming the coil portions of the pair of open / close electrodes of the fourth aspect are inclined at positions overlapping the conductors of the adjacent coil portions. Since it is arranged in such a manner that it is connected to the main electrode, a vacuum switch tube with stable breaking performance can be obtained.

In the vacuum switch tube according to the seventh aspect of the present invention, the support members for the pair of open / close electrodes are formed into a coil portion that circulates around the outer periphery by cutting a cylindrical conductive member in a plurality of oblique directions. Since the support disc is attached to the inner diameter on one end side of the coil part, the center part of this support disc is connected to one end side of the electrode rod, and the main electrode is attached to the other end side of the support disc. The structure of the coil portion is simple and the workability is good, and a uniform longitudinal magnetic field is applied to the entire surface of the main electrode, so that a vacuum switch tube with stable breaking performance can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an opening / closing electrode of a vacuum switch tube according to a first embodiment.

FIG. 2 is a sectional view showing a shape of a coil portion of a vacuum switch tube according to a second embodiment.

FIG. 3 is a sectional view showing a shape of a coil portion of a vacuum switch tube according to a third embodiment.

FIG. 4 is a development view of a coil unit showing an arrangement state of coil conductors according to a fourth embodiment.

FIG. 5 is a development view of a coil section showing an arrangement state of coil conductors according to a fifth embodiment.

FIG. 6 is a configuration diagram of opening / closing electrodes of a vacuum switch tube according to a sixth embodiment.

FIG. 7 is a development view of a coil unit according to the sixth embodiment.

FIG. 8 is a configuration diagram of an opening / closing electrode of a conventional vacuum switch tube.

FIG. 9 is an exploded view showing the shapes of members constituting the conventional vacuum switch tube of FIG.

FIG. 10 is a configuration diagram of an opening / closing electrode of another conventional vacuum switch tube.

FIG. 11 is a vertical magnetic field distribution diagram of a main electrode portion of a conventional vacuum switch tube.

[Explanation of symbols]

20 discharge space, 21 fixed side electrode, 22 movable side electrode, 23 main electrode, 24 supporting member, 25 electrode rod, 3
4b coil part, 44b coil part, 54 support member,
54b coil part, 64b coil part, 71 fixed side electrode, 72 movable side electrode, 74 coil part, 74a notch part, 74b coil, 75 support disc.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Satoshi Ochi             23 Kamitakano, Oita, Toyonaka-cho, Mitoyo-gun, Kagawa Prefecture             Mori Electric Co., Ltd. (72) Inventor Kenichi Koyama             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Shinji Sato             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F-term (reference) 5G026 DA02 DB01

Claims (7)

[Claims] 1. A pair of open / close electrodes to which a main electrode is attached are formed on one end side of an electrode rod through a supporting member having a coil portion that generates a longitudinal magnetic field by a plurality of conductors that circulate around the outer periphery, In a vacuum switch tube in which the main electrodes of the pair of open / close electrodes are opposed to each other, and the inside of the vacuum switch tube is removably housed in an insulating container held in a vacuum, the radial thickness of each coil portion of the pair of open / close electrodes is A vacuum switch tube characterized in that it is thinner than the height in the axial direction, and the radial center of the coil portion is located on the outer peripheral side. 2. The coil portion of each of the pair of open / close electrodes has a radial thickness on the main electrode side smaller than that on the anti-main electrode side so that the average diameter on the main electrode side is the anti-main electrode side. The vacuum switch tube according to claim 1, wherein the vacuum switch tube has a diameter larger than an average diameter on the side. 3. The vacuum switch according to claim 2, wherein the cross-sectional shape of the coil portion is formed in a trapezoidal cross section in which the radial thickness on the main electrode side is smaller than the thickness on the anti-main electrode side. tube. 4. The vacuum switch tube according to claim 2, wherein the cross-sectional shape of the coil portion is formed in a stepped shape in which a thin-walled portion in which the main electrode side is thinner than the anti-main electrode side is provided. . 5. A pair of open / close electrodes to which a main electrode is attached are formed on one end side of an electrode rod through a supporting member having a coil portion that generates a longitudinal magnetic field by a plurality of conductors that circulate around the outer periphery, In a vacuum switch tube in which main electrodes of a pair of open / close electrodes are opposed to each other and are housed in an insulating container whose inside is held in a vacuum so as to be able to come into contact with and separate from each other, the respective conductors forming the coil portion of the supporting member are adjacent coil portions. Vacuum switch tube, characterized in that a portion connected to the arm portion extending in the radial direction from the electrode rod and a portion connected to the main electrode of the adjacent coil portion are connected so as to overlap each other when viewed in the axial direction. . 6. The conductors of the coil portions of the pair of open / close electrodes are connected in an inclined direction with respect to the contact surface of the main electrode at positions overlapping the conductors of the adjacent coil portions. The vacuum switch tube according to claim 5. 7. A pair of open / close electrodes to which a main electrode is attached are formed on one end side of an electrode rod through a supporting member having a coil portion that generates a longitudinal magnetic field by a plurality of conductors that circulate around the outer periphery, In a vacuum switch tube in which main electrodes of a pair of open / close electrodes are opposed to each other and are housed in an insulating container whose inside is held in a vacuum so as to be able to come into contact with and separate from each other, the supporting member has a plurality of diagonal cuts in a cylindrical conductive member. A coil portion is formed to circulate around the outer circumference by inserting it, and a disc is arranged at the inner diameter on one end side of this support member to connect to one end side of the electrode rod, and the main electrode is attached to the other end side. Characteristic vacuum switch tube.