JP3148507B2 - Insulation rod for vacuum switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an insulating rod of a vacuum switchgear.

[0002]

2. Description of the Related Art Since a conventional insulating rod is generally used for each phase of an electric circuit in a vacuum switchgear, the vacuum switchgear will be described first. FIG. 6 is a structural view showing a general configuration of a main part inside the vacuum switchgear. FIG. 6A is an internal structure viewed from one side of the vacuum switchgear, and FIG. The internal structure viewed from the front is shown. The vacuum switchgear shown in the figure is for three phases and opens and closes three-phase electric circuits simultaneously. In the state shown in the figure, the vacuum switchgear is in an open state. 6 (a) and 6 (b), a vacuum switchgear is provided in an insulating frame 1 made of an insulating material for each single-phase electric circuit, and three main switches for substantially opening and closing the electric circuit. The circuit section 2 houses a drive mechanism section 3 for simultaneously driving the three main circuit sections 2 and an insulating rod 5 for electrically insulatingly connecting the main circuit section 2 and the drive mechanism section 3. The main circuit section 2 includes a vacuum valve 20, an upper terminal 2
1, a lower terminal 22, and a flexible conductor 23.
In the vacuum valve 20, a movable electrode rod 20a is provided in an insulating case 20b formed of an insulating member so as to operate vertically in the drawing, and a fixed electrode (not shown) is provided in the insulating case 20b. The metal upper terminal 21 is
One end is connected to the fixed electrode of the vacuum valve 20, and the other end is connected to an electric circuit. The lower terminal 22 made of metal has one end connected to the movable electrode rod 20a of the vacuum valve 20 via a flexible conductor 23 made of metal, and the other end connected to an electric circuit.
The main circuit unit 2 opens or closes the electric circuit by connecting or disconnecting the fixed electrode and the movable electrode rod 20a in the vacuum valve 20 by moving the movable electrode rod 20a in the vertical direction in the drawing. Not shown). The drive mechanism section 3 is entirely formed of metal, and operates within the insulating frame 1 to substantially open and close the main circuit section 2 via an insulating rod 5 described later, and a drive for operating the movable section. It is composed of parts. The movable part of the drive mechanism 3 includes a drive shaft 30,
The driving mechanism 3 includes a driving lever 31 and a movable core 32. The driving mechanism 3 includes a locking plate 33, an opening spring 34, and an iron core 3.
5, a coil 36, and a mounting member 37. still,
The drive mechanism 3 is grounded. First, the movable part of the drive mechanism 3 will be described. The prismatic drive shaft 30 has cylindrical ends at both ends, one end of which is mounted on the bearing 1 a of the insulating frame 1, and the other end of which is at the insulating frame 1.
Of the auxiliary switch 6 through the bearing 1b. The auxiliary switch 6, as shown in FIG. 6B, is installed on the outer side surface of the insulating frame 1, and outputs the open / closed state of the vacuum switchgear to the outside via a photocoupler or the like (not shown). One end of the planar drive lever 31 is connected to the drive shaft 30, and the other end is engaged with each of three insulating rods 5 described later. Further, as shown in FIG. 6B, at an intermediate portion between two adjacent insulating rods 5,
The drive lever 31 is extended toward the insulating frame 1 and is engaged with two opening springs 34 described later. The drive lever 31 in the vicinity of an insulating rod 5 described later is provided with a U-shaped groove 31a and the like, as shown in FIG. Here, the drive lever 31 in the vicinity of the conventional insulating rod 5
Will be described with reference to FIG. FIG. 7 is a perspective view showing the structure of the drive lever 31 near the insulating rod 5. 7, a U-shaped groove 31a is provided in the drive lever 31 so that the tube 56 (shown in FIG. 8) of the insulating rod 5 penetrates. The groove 31a
Around the drive lever 31
It is provided above. The protrusions 31 b prevent the coil spring 73 (shown in FIG. 8) of the insulating rod 5 that comes into contact with the drive lever 31 from shifting between the three protrusions 31 b. Further, the projection 31c is provided so as to project in the opposite direction to the projection 31b with the groove 31a interposed therebetween. The projection 31c contacts the second washer 57 (shown in FIG. 8) of the insulating rod 5 when the vacuum switching device is in the open state. Returning to FIG. 6, the planar movable core 3
2 has the other end fixed to the drive shaft 30 so that one end is in contact with the locking plate 33. Next, the driving portion of the driving mechanism 3 will be described. An opening spring 34 is provided on the end of the drive lever 31 opposite to the drive shaft 30 so that the movable portion of the drive mechanism 3 rotates clockwise in the drawing of FIG. Have been. The locking plate 33 is in contact with the movable core 32 when the vacuum switching device is in the opened state, and prevents the movable portion of the drive mechanism 3 from rotating by a predetermined amount or more by the opening spring 34. The two columnar iron cores 35 are installed on the insulating frame 1 via a mounting member 37 so as to be parallel to each other. A coil 36 is installed around one of the iron cores 35. Then, in the closed state of the vacuum switchgear, a current flows from a power supply (not shown) to the coil 36, and the movable core 32 is attracted by the magnetic force generated by the two cores 35 and the coil 36 and comes into contact with the two cores 35. . Note that a configuration in which a coil 36 is installed in each of the two iron cores 35 may be used. Next, the structure of the conventional insulating rod 5 will be described with reference to FIG. FIG. 8 is an explanatory view showing the structure of a conventional insulating rod 5 when the vacuum switchgear is in a closed state. FIG.
, The insulating rod 5 includes an insulating member 50, a first operating shaft such as a first bolt 51, a second operating shaft such as a second bolt 54, and the movable electrode rod 20 a of the main circuit unit 2.
And an elastic member, for example, a coil spring 73, for applying a predetermined contact pressure to the contact member. The insulating member 50 has a concave portion 50 at one end.
The main circuit section 2 and the drive mechanism section 3 are substantially insulated from each other, for example, by being made of plastic so as to have a.
The first bolt 51 has one end 51 a connected to the movable electrode rod 20 a with the flexible conductor 23 interposed therebetween, and the other end 51 b embedded in the insulating member 50. The nut 52 and the spring washer 53 are connected to one end 51 of the first bolt 51.
a is used for closely adhering the movable electrode rod 20a and the flexible conductor 23. The second bolt 54 is provided in the recess 50a.
End 54 so as to project in a direction perpendicular to the bottom surface 50b of the
a is embedded in the insulating member 50. Around the second bolt 54, a first washer 55 is provided.
a is attached so as to be in contact with the bottom surface 50b, and a cylindrical tube 56 made of metal is attached so as to be in contact with the first washer 55. The outer diameter of the tube 56 is formed smaller than the opening dimension of the groove 31a so as to penetrate the groove 31a of the drive lever 31. Next, a coil spring 73 is attached around the tube 56. Here, the shape of the coil spring 73 used for the conventional insulating rod 5 will be described with reference to FIG. FIG. 9 is a structural view showing the shape of a coil spring 73 used for the conventional insulating rod 5. As shown in FIG. FIG. 9A shows the coil spring 7.
FIG. 9B is a top view of the coil spring 73. FIG. As shown in FIG. 9, the coil spring 73 is wound with a constant inner diameter. Further, since the inner diameter of the coil spring 73 is larger than the outer diameter of the tube 56, the coil spring 7
3 and the tube 56 do not contact each other. Returning to FIG. 8, when the vacuum switching device is in the open state, a contact piece that comes into contact with the protrusion 31 c of the drive lever 31, for example, the second washer 57 is connected to the other end 54 b of the second bolt 54 at the lower end of the tube 56. And is fixed by a spring washer 58 and a nut 59. Since the inner diameters of the first washer 55, the second washer 57, and the tube 56 are formed to be larger than the outer diameter of the second bolt 54, the first washer 55, the second washer 57, and the The tube 56 and the second bolt 54 do not contact each other. Further, since the tube 56 is formed with a predetermined length, the coil spring 73 comes into contact with the first washer 55 and the second washer 57, respectively, to have a fixed length. As shown in FIG. 8, the conventional insulating rod 5 configured as described above includes a second washer 57 and a coil spring 73.
And the drive lever 31 is inserted between the drive mechanism 3 and the drive mechanism 3.

Next, the operating state of the conventional insulating rod 5 when the vacuum switchgear is open and closed will be described. First, when the vacuum switching device is in the open state, the driving lever 3
The first protrusion 31 c is the second washer 57 of the insulating rod 5.
And the second bolt 54 is in contact with the second washer 5 via the spring washer 58 and the nut 59.
7 and the drive lever 31. Therefore, the second bolt 54 is prevented from becoming a floating electrode by being grounded by the drive lever 31. When the vacuum switchgear is in the closed state, as shown in FIG. 8, the drive lever 31 compresses the coil spring 73 by the wipe size "W" and pushes it upward in the drawing. That is, the protrusion 31c of the drive lever 31 and the second washer 57 are separated from each other by the wipe size "W". However, since the first washer 55 in contact with the coil spring 73 and the tube 56 and the tube 56 in contact with the first washer 55 and the second washer 57 are provided,
The second bolt 54 is electrically connected to the drive lever 31 through a route of a nut 59, a spring washer 58, a second washer 57, a tube 56, a first washer 55, a coil spring 73, and a drive lever 31. And the second
The bolt 54 is grounded by the drive lever 31 and is prevented from becoming a floating electrode. Furthermore, when the vacuum switchgear is closed, the coil spring 73 is
In order to apply a predetermined contact pressure to a, the length of the coil spring 73 before engaging with the drive lever 31 (hereinafter, abbreviated as “initial length”) needs to be constant. Since the coil spring 73 is formed with the length, the coil spring 73 comes into contact with the first washer 55 and the second washer 57, respectively, and the initial length of the coil spring 73 becomes constant.

[0004]

In the conventional structure of the insulating rod 5 of the vacuum switchgear as described above, the second bolt 5
In order to prevent the vacuum switch 4 from becoming a floating electrode when the vacuum switchgear is closed, it was necessary to attach the second washer 57 and the tube 56. Therefore, the insulating rod 5
However, there is a problem that the number of parts cannot be reduced because of the large number of parts. Further, in order to make the initial length of the coil spring 73 constant, the second washer 5 having high machining accuracy is used.
7 and the tube 56 are required, and it takes time to attach the coil spring 73 to the second bolt 54.

An object of the present invention is to provide an insulating rod of a vacuum switchgear having a floating electrode prevention structure having a small number of parts and a small number of manufacturing steps. It is another object of the present invention to provide an insulating rod for a vacuum switchgear which can easily make the initial length of the coil spring 73 constant.

[0006]

According to a first aspect of the present invention, there is provided an insulating rod for a vacuum switchgear, wherein the insulating member substantially insulates a drive lever of the drive mechanism from a movable electrode of the main circuit. A first operating shaft having one end connected to the movable electrode of the main circuit portion, the other end embedded in the insulating member, one end embedded in the insulating member, and a vacuum switchgear. A second metallic member having the other end provided with a contact piece that comes into contact with the drive lever of the drive mechanism in the open state;
And the second operating shaft is provided around the second operating shaft, at least one end of which is in direct contact with the second operating shaft to electrically connect the second operating shaft and the drive lever of the drive mechanism. And a conductive elastic member for applying a predetermined contact pressure to the movable electrode of the main circuit portion.

According to a second aspect of the present invention, there is provided an insulating rod for a vacuum switchgear having a concave portion at one end facing the drive lever of the drive mechanism, wherein the drive lever of the drive mechanism and the main circuit portion are provided. An insulative member that substantially insulates the movable electrode, and one end is connected to the movable electrode of the main circuit unit,
A first operating shaft having the other end embedded in the insulating member;
One end embedded in the insulating member, a torso projecting from the bottom surface by a predetermined length in a direction perpendicular to the bottom surface of the concave portion of the insulating member, and a step portion between the torso. The other end formed with a size smaller than the size of the body portion and provided with a contact piece that comes into contact with the drive lever of the drive mechanism portion in the open state of the vacuum switchgear so as to contact the body portion at the step portion. A second operating shaft made of a metal, and provided around the body of the second operating shaft between the bottom surface of the concave portion of the insulating member and the contact piece; A conductive elastic member that directly contacts the operating shaft to electrically connect the second operating shaft to the drive lever of the drive mechanism, and that applies a predetermined contact pressure to the movable electrode of the main circuit unit; And a member.

According to a third aspect of the present invention, there is provided an insulating rod for a vacuum switchgear, wherein at least one end of the elastic member faces the second operating shaft. And a straight portion that extends.

According to a fourth aspect of the present invention, in the insulating rod for a vacuum switchgear, a hole is provided in the body of the second operating shaft to further provide the elastic member. Is engaged with the hole.

According to a fifth aspect of the present invention, in the insulating rod of the vacuum switchgear, the one end of the elastic member further includes an outer peripheral surface of the second operating shaft. Characterized in that it is formed so as to conform to the shape of.

According to a sixth aspect of the present invention, there is provided an insulating rod for a vacuum switchgear, wherein the second operating shaft is made of a metal having a cylindrical shape. And a helical portion whose inner diameter decreases toward the second operating shaft is provided at one end of the elastic member.

According to a seventh aspect of the present invention, there is provided an insulating rod for a vacuum switchgear, wherein the second operating shaft is made of a metal having a cylindrical shape. Wherein an arc portion is provided at at least one end of the elastic member so as to coincide with an outer peripheral surface of the second operating shaft.

[0013]

In the insulating rod of the vacuum switchgear configured as described above, the conductive elastic member directly abuts on the second operating shaft, and the drive lever of the grounded drive mechanism is connected to the second drive shaft. Since the second operating shaft is electrically connected to the second operating shaft, the second operating shaft is grounded without providing a dedicated member, thereby preventing the second operating shaft from becoming a floating electrode.

Further, since the elastic member is provided around the body projecting from the bottom surface by a predetermined length between the bottom surface of the concave portion of the insulating member and the contact piece of the second operating shaft, Keep the initial length constant.

A linear portion extending toward the second operating shaft is formed at at least one end of the elastic member so that the elastic member is always connected to the second operating shaft, and the second operating shaft is connected to the floating electrode. To prevent

Further, since a hole is provided in the body of the second operating shaft and one end of the elastic member is engaged with the hole, the elastic member and the second operating shaft are always connected. , Prevents the second operating shaft from becoming a floating electrode.

Further, since the one end of the elastic member is formed so as to match the shape of the outer peripheral surface of the second operating shaft, the elastic member and the second operating shaft are always connected, and the second operating shaft is connected. Prevents the shaft from becoming a floating electrode.

Further, the second member having a cylindrical shape is attached to one end of the elastic member.
Since the spiral portion whose inner diameter decreases toward the operating shaft is formed, the elastic member and the second operating shaft are always connected to prevent the second operating shaft from becoming a floating electrode.

Further, since at least one end of the elastic member is formed with an arc portion which matches the shape of the outer peripheral surface of the cylindrical second operating shaft, the elastic member and the second operating shaft are always connected. , Prevents the second operating shaft from becoming a floating electrode.

[0020]

【Example】

Embodiment 1 FIG. 1 is an explanatory view showing the structure of an insulating rod of a vacuum switchgear according to Embodiment 1 of the present invention. In the structure of the vacuum switchgear, since the structure other than the insulating rod is exactly the same as that of the conventional example, the same reference numerals are given. As for the structure and operation, all the explanations given for the conventional example are applied. Therefore, a duplicate description of these will be omitted. In the state shown in FIG. 1, the vacuum switching device is in a closed state. In FIG. 1, the insulating rod 4 includes an insulating member 40, a first operating shaft, for example, a first bolt 41 made of metal, a second operating shaft, for example, a second bolt 44 made of metal, and a main circuit portion. The second movable electrode 20a is formed of a conductive elastic member that applies a predetermined contact pressure to the movable electrode rod 20a, for example, a metal coil spring 70. The insulating member 40 is
The main circuit section 2 and the drive mechanism section 3 are substantially insulated from each other by being formed of plastic so as to have a concave portion 40a at one end. The first bolt 41 is connected to the movable electrode rod 20a with one end 41a sandwiching the flexible conductor 23 and the other end 41a.
b is embedded in the insulating member 40. Further, the metal nut 42 and the spring washer 43 are connected to the movable electrode rod 20a and the flexible conductor 2 at one end 41a of the first bolt 41.
3 is used to make close contact. Second bolt 4
Reference numeral 4 denotes a contact piece having one end 44a embedded in the insulating member 40 and a contact piece, for example, a metal washer 45, which comes into contact with the projection 31c of the drive lever 31 when the vacuum switching device is in the open state. Are fixed by a metal spring washer 46 and a nut 47. In the second bolt 44, the body portion 44c projects from the bottom surface 40b by a predetermined length in a direction perpendicular to the bottom surface 40b of the concave portion 40a. The diameter of the body 44c (shown by "B" in the drawing) is larger than the diameter of the other end 44b (shown by "A" in the drawing). That is, the second bolt 44
Is formed to have a step between the other end 44b and the body 44c. Further, since the inner diameter of the washer 45 is formed smaller than the diameter of the body portion 44c and larger than the diameter of the other end 44b, the washer 45 is
It is positioned in contact with the body 44c at the step between the body and the body 44c, and is fixed by the spring washer 46 and the nut 47. Next, the coil spring 70 is attached around the trunk 44c. Here, the shape of the coil spring 70 used for the insulating rod 4 of the present invention will be described with reference to FIG. FIG. 2 is a structural diagram showing the shape of a coil spring 70 according to one embodiment of the present invention. FIG. 2 (a)
2 is a side view of the coil spring 70, and FIG. 2B is a top view of the coil spring 70. As shown in FIG. 2, the coil spring 70 has a linear portion 70 extending to the center of the coil spring 70.
a are formed at both ends thereof. This linear portion 70a
When the coil spring 70 is attached to the second bolt 44, the coil spring 70 is deformed in the direction C or D in the drawing while being connected to the body 44c. In addition, the coil spring 73 is attached around a body portion 44c that projects from the bottom surface 40b with a predetermined length, and comes into contact with the bottom surface 40b and the washer 45 to have a fixed length. Then, as shown in FIG. 1, the drive rod 31 is inserted between the washer 45 and the coil spring 70, and the insulating rod 4 is connected to the drive mechanism 3.
Although the configuration using the first bolt 41 and the second bolt 44 as the first operating shaft and the second operating shaft has been described, for example, a metal square A columnar rod may be used.

In the insulating rod 4 of the vacuum switchgear configured as described above, the linear portion 70a of the coil spring 70 is
Directly in contact with the bolt 44 of the drive lever 31 and the second
Is electrically connected to the second bolt 44, so that the second bolt 44 is prevented from becoming a floating electrode by being grounded by the drive lever 31 irrespective of whether the vacuum switching device is open or closed. Further, the structure for preventing the floating electrode of the insulating rod 4 can be reduced in the number of parts and the number of manufacturing steps. A torso portion 44c protruding from the bottom surface 40b by a predetermined length between the bottom surface 40b of the concave portion 40a of the insulating member 40 and the contact piece 45 positioned by the step of the second operating shaft 44. Provided around the coil spring 70, the initial length of the coil spring 70 can be easily made constant with a configuration having a small number of components.

[Embodiment 2] FIG. 3 is an explanatory view showing the structure of an insulating rod of a vacuum switchgear according to Embodiment 2 of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description is omitted. It is needless to say that the same reference numerals designate the same material. The difference from the first embodiment is that the hole 44d
Is provided on the second bolt 44 as shown in FIG. The diameter of the hole 44d is slightly larger than the diameter of the linear portion 70a of the coil spring 70. In the insulating rod 4 of the vacuum switchgear of the present embodiment,
The coil spring 70 is mounted around the second bolt 44 with the linear portion 70a of the coil spring 70 engaging with a hole 44d provided in the second bolt 44. Therefore, compared to the first embodiment, the coil spring 70 and the second bolt 44 are connected more reliably, and the second bolt 44 is grounded and does not become a floating electrode regardless of the open / closed state of the vacuum switching device. .

[Embodiment 3] FIG. 4 is a structural view showing a shape of a coil spring 71 according to an embodiment of the present invention. Also,
FIG. 4A is a side view of the coil spring 71, and FIG.
(B) is a top view of the coil spring 71. In the configuration of the insulating rod 4, the configuration other than the coil spring 71 provided around the second bolt 44 is completely the same as that of the first embodiment, and thus the description is omitted. The difference from the first embodiment is that the spiral portion 7 in which the inner diameter of the coil spring 71 is gradually reduced.
1a is provided at one end of the coil spring 71. That is, the inner diameter of the spiral portion 71a gradually decreases as it advances toward the tip of the coil spring 71, and the spiral portion 71a is always connected to the body portion 44c of the second bolt when it is mounted around the second bolt 44. As described above, the minimum inner diameter (shown by "E" in the drawing) is slightly smaller than the diameter of the body portion 44c. Then, regardless of the open / closed state of the vacuum switchgear, the second bolt 44 is grounded and does not serve as a floating electrode.

[Embodiment 4] FIG. 5 is a structural view showing a shape of a coil spring 72 according to an embodiment of the present invention. Also,
FIG. 5A is a side view of the coil spring 72, and FIG.
(B) is a top view of the coil spring 72. In the configuration of the insulating rod 4, the configuration other than the coil spring 72 provided around the second bolt 44 is completely the same as that of the first embodiment, and thus the description is omitted. The difference from the first embodiment is that arc portions 72 a are provided at both ends of the coil spring 72. That is, when the circular arc portion 72a is attached around the second bolt 44, the circular arc portion 72a always
Is formed in conformity with the shape of the body portion 44c so as to be connected to the body portion 44c of the bolt. Then, regardless of the open / closed state of the vacuum switchgear, the second bolt 44 is grounded and does not serve as a floating electrode.

[0025]

Since the present invention is configured as described above, it has the following effects.

The conductive elastic member directly abuts on the second operating shaft to electrically connect the grounded drive lever of the drive mechanism to the second operating shaft. The second operating shaft can be grounded without being provided to prevent the second operating shaft from becoming a floating electrode.

Further, the elastic member is provided around the body projecting from the bottom surface with a predetermined length between the bottom surface of the concave portion of the insulating member and the contact piece of the second operating shaft. The initial length can be constant.

Also, a linear portion extending toward the second operating shaft is formed at at least one end of the elastic member so that the elastic member and the second operating shaft are always connected, and the second operating shaft is connected to the floating electrode. Can be prevented.

Further, since a hole is provided in the body of the second operating shaft and one end of the elastic member is engaged with the hole, the elastic member and the second operating shaft are always connected. In addition, it is possible to prevent the second operating shaft from becoming a floating electrode.

Further, since one end of the elastic member is formed so as to conform to the shape of the outer peripheral surface of the second operating shaft, the elastic member and the second operating shaft are always connected, and the second operating shaft is connected. The shaft can be prevented from becoming a floating electrode.

Also, since a spiral portion having an inner diameter decreasing toward the second operating shaft is formed at one end of the elastic member on the insulating member side, the elastic member and the second operating shaft are connected to each other. Always connected to prevent the second operating shaft from becoming a floating electrode.

Further, since at least one end of the elastic member is formed with an arc portion which matches the shape of the outer peripheral surface of the cylindrical second operating shaft, the elastic member and the second operating shaft are always connected. In addition, it is possible to prevent the second operating shaft from becoming a floating electrode.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a structure of an insulating rod of a vacuum switchgear which is Embodiment 1 of the present invention.

FIG. 2 is a structural diagram showing a shape of a coil spring which is Embodiment 1 of the present invention.

FIG. 3 is an explanatory view showing a structure of an insulating rod of a vacuum switchgear which is Embodiment 2 of the present invention.

FIG. 4 is a structural view showing a shape of a coil spring which is Embodiment 3 of the present invention.

FIG. 5 is a structural diagram showing a shape of a coil spring which is Embodiment 4 of the present invention.

FIG. 6 is a structural diagram showing a general configuration of a main part inside a vacuum switchgear.

FIG. 7 is a perspective view showing the structure of a drive lever near an insulating rod.

FIG. 8 is an explanatory view showing the structure of a conventional insulating rod.

FIG. 9 is a structural diagram showing the shape of a conventional coil spring.

[Explanation of symbols]

40 Insulating member, 41 First operating shaft, 42 Second operating shaft, 70, 71, 72 Elastic member, 70a Linear portion, 71a Spiral portion, 72a Arc portion.

Claims (7)

(57) [Claims] 1. An insulating rod for electrically insulatingly connecting a drive lever of a drive mechanism and a movable electrode of a main circuit section, the drive rod of the drive mechanism and the movable electrode of the main circuit section being connected to each other. An insulating member that substantially insulates the first operating shaft, one end of which is connected to the movable electrode of the main circuit portion and the other end is embedded in the insulating member; A second operating shaft made of metal having one end provided, and the other end provided with a contact piece that comes into contact with the drive lever of the drive mechanism unit in the open state of the vacuum switching device; and around the second operating shaft , At least one end of which is in direct contact with the second operating shaft to electrically connect the second operating shaft and the drive lever of the drive mechanism, and that the movable electrode of the main circuit portion is provided. And a conductive elastic member that applies a predetermined contact pressure to Insulating rod of the vacuum switchgear according to claim. 2. An insulating rod for electrically insulatingly connecting a drive lever of a drive mechanism section and a movable electrode of a main circuit section, the drive rod having a recess at one end facing the drive lever of the drive mechanism section. An insulating member that substantially insulates the driving lever of the driving mechanism unit from the movable electrode of the main circuit unit, one end of which is connected to the movable electrode of the main circuit unit, and the other end of which is inside the insulating member. A buried first operating shaft, one end buried in the insulating member, a trunk protruding from the bottom surface by a predetermined length in a direction perpendicular to a bottom surface of a concave portion of the insulating member, and the trunk A contact piece that contacts a drive lever of the drive mechanism in the open state of the vacuum switchgear, the contact piece being formed at the step with a smaller dimension than the body so as to have a step between the part. Metallic second actuation with other end provided in contact with the torso A shaft, provided around the body of the second operating shaft between the contact piece and the bottom surface of the concave portion of the insulating member, at least one end of which directly contacts the second operating shaft, Electrically connecting the second operating shaft and a drive lever of the drive mechanism,
And an electrically conductive elastic member for applying a predetermined contact pressure to the movable electrode of the main circuit portion. 3. The insulating rod according to claim 1, wherein a linear portion extending toward the second operating shaft is formed at at least one end of the elastic member. 4. The vacuum switchgear according to claim 2, wherein a hole is provided in a body of the second operating shaft, and one end of the elastic member is engaged with the hole. Insulating rod. 5. The insulating rod according to claim 1, wherein one end of the elastic member is formed so as to conform to a shape of an outer peripheral surface of the second operating shaft. . 6. The second operating shaft is a metal rod formed in a cylindrical shape, and the second operating shaft is provided at one end of the elastic member.
3. The insulating rod for a vacuum switchgear according to claim 1, further comprising a helical portion having an inner diameter that decreases toward the operating shaft. 7. The second operating shaft is a metal rod formed in a cylindrical shape, and at least one end of the elastic member is provided with an arc portion that matches the outer peripheral surface of the second operating shaft. The insulating rod of a vacuum switchgear according to claim 1 or claim 2, wherein