JP6783720B2 - Vacuum switchgear - Google Patents

Description

The present invention relates to a vacuum switchgear, and particularly relates to a switchgear and a vacuum switchgear suitable for a switchgear in which an operator for opening / closing the switchgear is arranged in a straight line.

A conventional vacuum switchgear, for example, a vacuum switchgear constituting a high-voltage lead-through cable branching unit mounted on a railroad vehicle, has a switchgear and an operator arranged in a straight line, but when both are arranged in a straight line. , The length in the axial direction was long.

As a vacuum switchgear for improving this, for example, there is one described in Patent Document 1. The vacuum switchgear described in Patent Document 1 opens a spring wipe spring that applies a contact force to the switchgear electrode in the closed state and a switchgear electrode inside the electromagnetic operator that opens and closes the switchgear. By arranging the shut-off springs for the purpose in a nested manner , the length in the axial direction is shortened.

In the vacuum opening / closing device described in Patent Document 1, a first movable spring receiver that receives both one end of a wipe spring and a blocking spring arranged in a nested manner and transmits an attractive force of an electromagnet, and a wipe spring and the like. It is equipped with a second movable spring receiver that is in contact with the end and mechanically connected to the movable side of the switch, and a fixed spring receiver that is in contact with the other end of the shutoff spring. The switch has a second movable during the opening / closing operation. The spring receiver is always located inside the fixed spring receiver.

Chinese Patent Application Publication No. 101615524

In general, in order to reduce the energy loss of the breaking spring during the opening / closing operation of the switch, it is necessary to suppress the buckling of the breaking spring, and for that purpose, the guide having an outer diameter substantially equal to the inner diameter of the breaking spring is cut off. It is effective to place it inside the spring.

In the vacuum opening / closing device described in Patent Document 1, the output shaft of the electromagnet penetrating the inside of the shutoff spring has a stepped structure, and the diameter of the large diameter portion of the output shaft of this stepped structure is made equal to the outer diameter of the wipe spring. As a result, the inside of the breaking spring is continuously and mechanically guided to prevent buckling of the breaking spring.

However, in order to prevent buckling of the breaking spring in the vacuum opening / closing device described in Patent Document 1, it is necessary to provide a large diameter portion equal to the outer diameter of the wipe spring on the output shaft of the electromagnet, which increases the weight of the movable portion. There was a risk of inviting.

The present invention has been made in view of the above points, and an object of the present invention is to provide a vacuum switchgear capable of preventing buckling of a breaking spring without increasing the weight of a moving part.

In the vacuum switch of the present invention, in order to achieve the above object, a switch and an operator for opening / closing the switch are arranged in a straight line, and the switch comes into contact with the switch electrode in the closed state. A wipe spring for applying force and a shutoff spring for opening the switch electrode are provided, and one end of the wipe spring and the shutoff spring abuts on a common first movable spring receiver, and the first movable spring receiver It is mechanically connected to the operator, the other end of the wipe spring abuts on the second movable spring receiver, and the second movable spring receiver is mechanically connected to the switch of the blocking spring. The other end is a vacuum opening / closing device having a configuration in which it abuts on a fixed spring receiver, and the wipe spring is arranged in a nested manner inside the blocking spring, and the second switch is opened / closed with the opening / closing operation of the switch . The movable spring receiver has a state of being located on the switch side of the fixed spring receiver outside the axial region sandwiched between the first movable spring receiver and the fixed spring receiver, and in the shutoff state of the switch. The second movable spring receiver is located inside the fixed spring receiver, and when the switch is turned on, the second movable spring receiver is located outside the fixed spring receiver. It is a feature.

According to the present invention, buckling of the blocking spring can be prevented without increasing the weight of the moving part.

It is a figure which shows the example of the vehicle formation in the railroad vehicle which adopts the vacuum switchgear of this invention. It is an electric circuit diagram in the railroad car formation shown in FIG. It is a figure which shows the arrangement structure of the unit switchgear which is a switchgear adopted in Example 1 of the vacuum switchgear of this invention. It is a figure which shows the state which connected the T-type cable head to the unit switch shown in FIG. FIG. 5 is a diagram showing a configuration in which the unit switch shown in FIG. 4 is housed in a case so that an unbalanced load is not applied to the electrical connection portion. It is a side view of FIG. It is a figure which shows the mounting state which attached the cable to Example 1 of the vacuum switchgear of this invention installed on the roof of a vehicle, and stored this in an outer case. It is a figure which shows Example 1 of the vacuum switchgear of this invention, and shows the positional relationship of a wipe spring and a shutoff spring in a cutoff state of a vacuum interrupter. It is a figure which shows Example 1 of the vacuum switchgear of this invention, and shows the positional relationship of a wipe spring and a shut-off spring in a state where a vacuum interrupter is put in. FIG. 2 shows Example 2 of the vacuum switchgear of the present invention, and is a diagram showing the positional relationship between the wipe spring and the shutoff spring in the cutoff state of the vacuum interrupter. FIG. 2 shows Example 2 of the vacuum switchgear of the present invention, and is a diagram showing the positional relationship between the wipe spring and the shutoff spring in the state where the vacuum interrupter is turned on. FIG. 3 shows Example 3 of the vacuum switchgear of the present invention, and is a diagram showing the positional relationship between the wipe spring and the breaking spring in the state where the vacuum interrupter is turned on. FIG. 4 shows Example 4 of the vacuum switchgear of the present invention, and is a diagram showing the positional relationship between the wipe spring and the shutoff spring in the cutoff state of the vacuum interrupter. FIG. 4 shows Example 4 of the vacuum switchgear of the present invention, and is a diagram showing the positional relationship between the wipe spring and the breaking spring in the state where the vacuum interrupter is turned on. FIG. 5 shows Example 5 of the vacuum switchgear of the present invention, and is a diagram showing the positional relationship between the wipe spring and the shutoff spring in the cutoff state of the vacuum interrupter.

Hereinafter, the vacuum switchgear of the present invention will be described based on the illustrated examples. In each embodiment, the same reference numerals are used for the same components.

FIG. 1 shows an example of vehicle formation in a railway vehicle in which the vacuum switchgear of the present invention is adopted.

As shown in the figure, the railroad vehicle 25 in this embodiment is composed of eight cars of reference numerals 1stCar, 2ndCar, 3rdCar, 4thCar, 5thCar, 6thCar, 7thCar, and 8thCar.

High-voltage pull-through cables RC1, RC2, RC3, RC4, and RC5 are arranged on the roof of the vehicle, and these high-voltage pull-through cables RC1, RC2, RC3, RC4, and RC5 are linear joints SJ1, SJ2, and SJ3. , SJ4 connects the vehicles, and T-branch joints TJ1 and TJ2 branch in the underfloor direction of the vehicle.

Further, pantographs PG1 and PG2 are connected to the high-voltage lead-through cables RC3 and RC5, and electric power is received from an electric wire (not shown).

FIG. 2 shows an electric circuit in the rolling stock formation of the railway vehicle shown in FIG.

As shown in the figure, the high-voltage lead-through cable RC1 is directly connected to the primary side of the power receiving VCB1 provided under the floor of the vehicle, and the secondary side of the power receiving vacuum circuit breaker VCB1 is connected to the main transformer Tr1. Connected, the secondary winding of the main transformer TR1 supplies power to the electric motor, and the tertiary winding supplies power to the auxiliary equipment. Similarly, the high-voltage lead-through cable branched by the T-branch unit TJ1 is connected to the primary side of the power receiving vacuum circuit breaker VCB2 provided under the floor of the vehicle, and the secondary side of the power receiving VCB2 is connected to the main transformer Tr2. Connected, the secondary winding of the main transformer TR2 supplies power to the electric motor, and the tertiary winding supplies power to the auxiliary equipment. Similarly, the high-voltage lead-through cable branched by the T-branch unit TJ2 is connected to the primary side of the power receiving vacuum circuit breaker VCB3 provided under the floor of the vehicle, and the secondary side of the power receiving VCB3 is connected to the main transformer Tr3. Connected, the secondary winding of the main transformer TR3 supplies power to the electric motor, and the tertiary winding supplies power to the auxiliary equipment.

As shown in FIG. 2, the power receiving vacuum breakers VCB1, VCB2, and VCB3 and the main transformers Tr1, Tr2, and Tr3 are arranged under the floor of the vehicle, and other electrical devices shown in FIG. (Cables RC1, RC2, RC3, RC4, RC5, straight joints SJ1, SJ2, SJ3, SJ4, pantographs PG1, PG2, T-branch joints TJ1, TJ2) are arranged on the roof of the vehicle.

By the way, since it is not convenient for the worker to climb on the roof of the vehicle, it is preferable that the worker can work without climbing on the roof of the vehicle as much as possible. Further, when the electric device is arranged on the roof of the vehicle, the space of the roof of the vehicle is particularly restricted in the height direction, and it is desired that the height of the electric device can be reduced.

For example, in the electric circuit shown in FIG. 2, when a ground fault occurs at the position indicated by Fault, the linear joint SJ2 is automatically opened by an external command to open only the main transformer Tr1. It becomes possible to disconnect and continue the operation. Specifically, the movable electrode 5 in the unit switch described below is operated.

In this embodiment, the case where a ground fault occurs at the position shown by Fault in FIG. 2 is described as an example. Therefore, in order to prevent the spread of the accident, only the linear joint SJ2 disconnects the circuit. Needless to say, the straight joint to be separated changes depending on the location of the ground fault.

With such a structure, it is possible to automatically separate the high-voltage cable including the defective portion from the sound high-voltage cable without the operator climbing on the roof of the vehicle.

FIG. 3 shows details of the unit switchgear (T-branch joints TJ1 and TJ2), which is a switchgear used in the vacuum switchgear of this embodiment.

The unit switch (T-branch joint TJ1, TJ2) shown in the figure covers the fixed electrode 3, the movable electrode 5 that contacts or opens the fixed electrode 3, and the fixed electrode 3 and the movable electrode 5. It includes an arc shield 6, cylindrical ceramic insulating cylinders 7A and 7B that support the arc shield 6 and form an outer container of the vacuum interrupter 1, and a vacuum interrupter 1 composed of bellows 2 and the like.

The outer container of the vacuum interrupter 1 described above is configured by covering both ends of the ceramic insulating cylinders 7A and 7B with end plates, and keeps the inside in a vacuum state. The fixed electrode 3 is connected to the fixed conductor 3a, and the fixed conductor 3a is pulled out of the vacuum interrupter 1. On the other hand, the movable electrode 5 is connected to the movable conductor 5a, and the movable conductor 5a is pulled out of the vacuum interrupter 1. The bellows 2 described above is arranged between the movable conductor 5a and the end plate on the movable side so that the movable conductor 5a can move while maintaining the vacuum state of the vacuum interrupter 1.

Further, in the unit switch, the bushing conductor 9A connected to the fixed conductor 3a and the bushing conductors 9B and 9C connected to the movable conductor 5a are molded with a solid insulating material 11 such as epoxy resin, and the vacuum interrupter 1 is movable. On the side, an aerial insulation operation rod 10 for driving the movable electrode 5 of the vacuum interrupter 1 to and from the fixed electrode 3 is provided.

The solid insulator 11 described above closely covers the vacuum interrupter 1, the bushing conductors 9A, 9B and 9C, and also covers the periphery of the aerial insulation operation rod 10. Further, the space around the aerial insulation operation rod 10 is sealed with a solid insulator 11 by a sealing means, and an insulating gas such as dry air or SF6 gas is sealed inside. As the sealing means, a straight seal or a bellows is applied.

Further, the air insulation operating rod 10 is connected to the electromagnetic operating device 12, and the electromagnetic operating device 12 is arranged substantially in a straight line with the vacuum interrupter 1. Note that 8A, 8B, and 8C are electrical connection portions.

Next, FIG. 4 shows a state in which the T-shaped cable heads 13A, 13B, and 13C are connected to the unit switch (T branch joints TJ1, TJ2) shown in FIG.

As shown in FIG. 4, the vacuum interrupter 1 is arranged substantially linearly with the electromagnetic controller 12, and is connected to the bushing conductor 9A connected to the fixed conductor 3a on the fixed electrode 3 side via the electrical connection portion 8A. The T-type cable head 13A is connected so as to be arranged upward in FIG. 4, and is connected to the bushing conductors 9B and 9C connected to the movable conductor 5a on the movable electrode 5 side via the electrical connection portions 8B and 8C. The heads 13B and 13C are connected so as to be arranged in the left-right arrangement in FIG. 14A, 14B and 14C are insulating plugs.

With such an arrangement, the total width can be reduced because the electromagnetic controller 12 and the cables extending from the T-shaped cable heads 13B and 13C do not interfere with each other.

Although detailed description is omitted, the electromagnetic actuator 12 generates a driving force by, for example, combining a permanent magnet and an electromagnet with a spring and switching ON / OFF of energization of a coil constituting the electromagnet.

Next, in FIG. 5, the unit switches (T branch joints TJ1 and TJ2) shown in FIG. 4 are housed in the outer case 17 so that an unbalanced load is not applied to the electrical connection portions 8A, 8B and 8C. Is shown.

As shown in the figure, the cables 15A, 15B, 15C extending from the T-shaped cable heads 13A, 13B, 13C, respectively, are mechanically held by the outer case 17 to form a branch joint, and the electrical connection portions 8A, 8B, An unbalanced load is not applied to 8C.

Here, the cable 15B is routed to the front of the railway vehicle (downward in the figure), the cable 15A is routed to the rear of the railway vehicle (upward in the figure), and the cable 15C is connected to the main transformer under the floor.

In such a configuration, the roof of the vehicle is grounded to ensure safety, and the surfaces of the T-shaped cable heads 13A, 13B, 13C and the unit switch (T branch joints TJ1, TJ2) are grounded. It has become.

Generally, the roof of the vehicle is grounded from the viewpoint of ensuring the safety of workers, but as described above, there are also large height restrictions on the electrical equipment arranged on the roof of the vehicle.

On the other hand, according to the configuration shown in FIG. 5, since the surfaces of the T-shaped cable heads 13A, 13B, 13C and the unit switch (T branch joints TJ1 and TJ2) are at the ground potential, the roof of the vehicle It is not necessary to secure an insulation distance between the and, and the height can be reduced. More specifically, the branch unit can be arranged on the roof and substantially parallel to the roof.

Further, the bushing conductors 9B and 9C are arranged in a direction substantially perpendicular to the movable direction of the movable electrode 5 to prevent the bushing conductors 9B and 9C from increasing in size in the movable direction.

In the configuration shown in FIG. 5, the bushing conductors 9B and 9C are arranged in a direction substantially perpendicular to the movable direction of the movable electrode 5, but are provided at least in a direction different from the movable direction of the movable electrode 5. If so, a certain effect can be expected.

Further, as shown in FIG. 6, the unit switches (T branch joints TJ1 and TJ2) are fixed to the base 18 by the stays 19A, 19B and 19C, and the base 18 is fixed to the railway vehicle.

Further, FIG. 7 shows a state in which cables 15A and 15B are attached to the above-mentioned vacuum switchgear installed on the roof 16 of the vehicle and the cables 15A and 15B are housed in the outer case 17.

Next, in FIGS. 8 and 9, the vacuum interrupter 1 in the vacuum opening / closing device of this embodiment is in a cutoff state (fixed electrode 3 and movable electrode 5 are in an open state) and in a closed state (fixed electrode 3 and movable electrode 5 are in contact with each other). The details of the wipe spring 20 that gives a contact force to the movable electrode 5 and the blocking spring 21 that opens the movable electrode 5 in the state) are shown (part A in FIG. 8 corresponds to part A in FIG. 3). Note that FIG. 8 shows a shutoff state of the vacuum interrupter 1, and FIG. 9 shows a closed state of the vacuum interrupter 1.

As shown in FIGS. 8 and 9, in the vacuum switchgear of this embodiment, the vacuum interrupter 1 and the electromagnetic actuator 12 that performs the opening / closing operation of the vacuum interrupter 1 are arranged substantially linearly, and the wipe spring. 20 are arranged in a nested manner inside the blocking spring 21.

Then, one end (electromagnetic operator 12 side) of the wipe spring 20 and the cutoff spring 21 abuts on the common first movable spring receiver 22, and the first movable spring receiver 22 mechanically attaches to the electromagnetic operator 12. The other end (vacuum interrupter 1 side) of the wipe spring 20 abuts on the second movable spring receiver 23, and the second movable spring receiver 23 is mechanically connected to the vacuum interrupter 1 and shuts off. The other end of the spring 21 (on the vacuum interrupter 1 side) is configured to be in contact with the fixed spring receiver 24, and the second movable spring receiver 23 is a first movable spring as the vacuum interrupter 1 opens and closes. It has a state of being located outside the axial region (range L in FIG. 9) sandwiched between the receiver 22 and the fixed spring receiver 24.

Specifically, when the vacuum interrupter 1 is in the cutoff state (the state shown in FIG. 8), the second movable spring receiver 23 is located slightly inside the fixed spring receiver 24 (on the electromagnetic controller 12 side), and is located on the vacuum interrupter 1. In the closed state (state of FIG. 9), the second movable spring receiver 23 is located outside the fixed spring receiver 24 (anti-operator side = vacuum interrupter 1 side).

With the configuration of this embodiment as described above, since the wipe spring 20 is arranged in a nested manner inside the blocking spring 21 during the opening / closing operation of the vacuum interrupter 1, the outer peripheral surface of the wipe spring 20 is blocked. Since the inner peripheral surface of the spring 21 is guided, it is not necessary to provide a guide for preventing buckling, so that the weight of the movable portion does not increase, and the second movable spring receiver 23 is the first movable spring receiver. Since it has a state of being located outside the axial region (range L in FIG. 9) sandwiched between the 22 and the fixed spring receiver 24, the entire shutoff spring 21 (from end to end) is guided by the wipe spring 20. that reason, buckling of the opening spring 21 is suppressed, so that energy loss of the blocking spring 21 is reduced.

Further, since the wipe spring 20 has a spring shape, the weight is smaller than that of the solid shaft having the same outer diameter, so that the wipe spring 20 is smaller than the solid shaft having the same outer diameter. It is possible to suppress an increase in the weight of the moving part.

Further, in this embodiment, the winding directions of the wires of the wipe spring 20 and the blocking spring 21 are opposite to each other (for example, the wires of the wipe spring 20 are wound right and the wires of the blocking spring 21 are wound left). , The wire of the wipe spring 20 and the breaking spring 21 do not mesh with each other, and a smooth guide action can be realized.

Further, in this embodiment, the tightening state of the screw in the vicinity of the second movable spring receiver 23 can be visually inspected in the state of being turned on in FIG. 9, so that there is also an effect of high reliability.

Therefore, according to this embodiment, by forming the shutoff spring 21 and the wipe spring 20 into a nested structure, the length in the axial direction is shortened, and the inside of the shutoff spring 21 is wiped without increasing the weight of the movable part. By guiding with 20, the buckling of the shutoff spring 21 can be prevented and the energy loss during the shutoff operation can be reduced.

Example 2 of the vacuum switchgear of the present invention will be described with reference to FIGS. 10 and 11. Note that FIG. 10 shows a shutoff state of the vacuum interrupter 1, and FIG. 11 shows a closed state of the vacuum interrupter 1.

The configuration of the present embodiment shown in the figure is substantially the same as that of the first embodiment, but in the present embodiment, the winding directions of the wires of the wipe spring 20 and the blocking spring 21 are the same, and the wipe spring 20 (The wire of the wipe spring 20 may be wound tightly and the wire of the blocking spring 21 may be wound roughly). ..

In this embodiment as well, if the winding pitch of the wipe spring 20 is appropriately selected (the wire of the wipe spring 20 is roughly wound and the wire of the blocking spring 21 is tightly wound), the same as in the first embodiment. The effect can be obtained. Further, since the winding direction of the wire of the wipe spring 20 and the breaking spring 21 is the same, there is an effect that the through shaft inside the spring and the screw fastening portion can be easily seen from the outside.

Example 3 of the vacuum switchgear of the present invention will be described with reference to FIG. Note that FIG. 12 shows a state in which the vacuum interrupter 1 is charged.

This embodiment shown in the drawing, although its construction is substantially the same as in Example 1, in this embodiment, by abutting portions wiping spring 20 of the first movable spring bearing 22 to the wall thickness, The total length of the wipe spring 20 is shortened.

That is, in this embodiment, the portion of the first movable spring receiver 22 that comes into contact with the wipe spring 20 is projected in the axial direction to form the convex portion 22a, and the radial thickness of the convex portion 22a is determined by the wipe spring 20. It is about the same as the outer diameter.

In this embodiment, the same guide effect as in the first embodiment and the effect of visually checking the tightening state of the screw in the vicinity of the second movable spring receiver 23 can be obtained, and the thick portion of the first movable spring receiver 22 can be used. Since it is not necessary to arrange the wipe spring 20, the total length of the wipe spring 20 can be shortened, which has the effect of expanding the selection range of the total length of the wipe spring 20.

Example 4 of the vacuum switchgear of the present invention will be described with reference to FIGS. 13 and 14. Note that FIG. 13 shows a shutoff state of the vacuum interrupter 1, and FIG. 14 shows a closed state of the vacuum interrupter 1.

The configuration of the present embodiment shown in the figure is substantially the same as that of the first embodiment, but in the present embodiment, the second movable spring receiver 23 is sandwiched between the first movable spring receiver 22 and the fixed spring receiver 24. It is always located outside the axial region (the range L in FIGS. 13 and 14) (even in the shut-off state and the closed state).

That is, in this embodiment, the second movable spring receiver 23 is the first movable spring receiver 22 and the fixed spring receiver in the shutoff state (state of FIG. 13) and the closing state (state of FIG. 14) of the vacuum interrupter 1. It is always located on the vacuum interrupter 1 side of the fixed spring receiver 24 outside the axial region (range L in FIGS. 13 and 14) sandwiched by the 24.

In this embodiment as well, the same effect as that of the first embodiment can be obtained, and the screw tightening state in the vicinity of the second movable spring receiver 23 can be visually observed not only in the closed state but also in the closed state of the vacuum interrupter 1. , Further improvement in reliability.

Example 5 of the vacuum switchgear of the present invention will be described with reference to FIG. Note that FIG. 15 shows the cutoff state of the vacuum interrupter 1.

The configuration of this embodiment shown in the figure is substantially the same as that of the first embodiment, but in this embodiment, two wipe springs are used, one wipe spring 20 is on the inside, and the wipe spring 20A is on the outside. In addition to being arranged in a nested manner, the two nested wipe springs 20 and 20A are arranged inside, and the blocking spring 21 is arranged in a nested manner on the outside.

In this embodiment as well, the surging characteristics of the wipe spring can be changed by combining two wipe springs 20 and 20A having different outer diameters while obtaining the same effect as in the first embodiment.

It should be noted that the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

1 ... Vacuum interrupter, 2 ... Bellows, 3 ... Fixed electrode, 3a ... Fixed conductor, 5 ... Movable electrode, 5a ... Movable conductor, 6 ... Arc shield, 7A, 7B ... Ceramic insulation cylinder, 8A, 8B, 8C ... Electrical connection Parts, 9A, 9B, 9C ... Bushing conductor, 10 ... Air insulation operating rod, 11 ... Solid insulation, 12 ... Electromagnetic controller, 13A, 13B, 13C ... T-type cable head, 14A, 14B, 14C ... Insulation plug , 15A, 15B, 15C ... Cable, 16 ... Roof, 17 ... Exterior case, 18 ... Base, 19A, 19B, 19C ... Stay, 20, 20A ... Wipe spring, 21 ... Blocking spring, 22 ... First movable spring receiver , 22a ... Convex portion of the first movable spring receiver, 23 ... Second movable spring receiver, 24 ... Fixed spring receiver, 25 ... Railway vehicle.

Claims (6)

A switch and an operator for opening / closing the switch are arranged in a straight line, and a wipe spring that gives a contact force to the switch electrode when the switch is turned on and a shutoff spring that opens the switch electrode. With
One end of the wipe spring and the blocking spring abuts on a common first movable spring receiver, the first movable spring receiver is mechanically connected to the operator, and the other end of the wipe spring is a second. The second movable spring receiver is mechanically connected to the switch, and the other end of the shutoff spring is a vacuum opening / closing device that abuts the fixed spring receiver.
The wipe spring is nested inside the shutoff spring, and the second movable spring receiver is provided by the first movable spring receiver and the fixed spring receiver in accordance with the opening / closing operation of the switch . It has a state of being located on the switch side from the fixed spring receiver outside the sandwiched axial region.
In the shutoff state of the switchgear, the second movable spring receiver is located inside the fixed spring receiver, and in the closed state of the switchgear, the second movable spring receiver is outside the fixed spring receiver. A vacuum switchgear characterized by being located in . A switch and an operator for opening / closing the switch are arranged in a straight line, and a wipe spring that gives a contact force to the switch electrode when the switch is turned on and a shutoff spring that opens the switch electrode. With
One end of the wipe spring and the blocking spring abuts on a common first movable spring receiver, the first movable spring receiver is mechanically connected to the operator, and the other end of the wipe spring is a second. The second movable spring receiver is mechanically connected to the switch, and the other end of the shutoff spring is a vacuum opening / closing device that abuts the fixed spring receiver .
When the wipe spring is arranged inside the shutoff spring in a nested manner and the switchgear is shut off and turned on, the second movable spring receiver is the first movable spring receiver and the fixed spring receiver. A vacuum switchgear that is always located on the switchgear side of the fixed spring receiver outside the axial region sandwiched by the switchgear. In the vacuum switchgear according to claim 1 or 2 .
A vacuum switchgear characterized in that the winding directions of the wires of the wipe spring and the blocking spring are reverse winding. In the vacuum switchgear according to claim 1 or 2 .
The winding direction of the wire of the wipe spring and the breaking spring is the same, and one of the wire of the wipe spring and the breaking spring is roughly wound and the other is tightly wound. A featured vacuum switchgear. In the vacuum switchgear according to any one of claims 1 to 4 .
A portion of the first movable spring receiver that comes into contact with the wipe spring is projected in the axial direction to form a convex portion, and the radial thickness of the convex portion is set to be about the same as the outer diameter of the wipe spring. A vacuum switchgear characterized by. In the vacuum switchgear according to any one of claims 1 to 5 ,
The wipe spring is a vacuum switchgear characterized in that two wipe springs are nested, and the two nested wipe springs are nested with the blocking spring.

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