JPS6327406Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a vacuum switch, and in particular, a cylindrical metal tank with a bottom is closed with an insulating disc made of ceramic to form a vacuum container, and a pair of electrodes are connected and separated within the vacuum container. This invention relates to a vacuum switch using a so-called cup-shaped vacuum valve that can be freely installed.

The so-called cup-shaped vacuum valve mentioned above is compared to a general vacuum valve in which both ends of an insulating tube are closed with metal end plates to form a vacuum container, and a pair of electrodes are provided inside this vacuum container so that they can be moved toward and away from the vacuum chamber. By easily increasing the outer diameter of the container, it is possible to switch on and off a large amount of current, and the insulating member for insulating both live parts can be made of ceramic instead of an expensive insulating tube made of ceramic or the like. By using an insulating disk consisting of an insulating disk, manufacturing becomes easier and the vacuum valve can be made inexpensive. However, when assembled as a vacuum switch, the aerial creepage distance between both live parts is longer than that of an insulating disk. The dielectric strength between both live parts in this part is smaller than that of a general vacuum valve, making it difficult to open and close high-voltage current, and the metal tank having the same potential as one live part. It is dangerous because it is exposed over a relatively wide area, and the dielectric strength between each phase decreases.
Furthermore, there are various problems that must be solved, such as difficulty in attaching leads that connect both charging parts and an external circuit.

In view of the above points, the present invention provides a vacuum switch in which a movable lead and an operating device are integrated, which facilitates the connection between the movable lead and an external circuit, and which has a compact configuration of the operating device part. The purpose is to

Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 1, 1 is a so-called cup-shaped vacuum valve, and the details of the vacuum valve 1 are shown in FIG. In Fig. 2, 2 is an insulating plate made of ceramic having a hole 2a in the center and a stepped portion 2b on the inner surface of the outer periphery, 3 is a cylindrical shield having a stepped small diameter portion at one end; The side end portion is fitted and brazed to the periphery of the hole 2a. 4 is a bellows whose one end is fitted and brazed to the stepped small diameter portion of the shield 3; 5 is a movable electrode rod which is inserted through the bellows 4 and the hole 2a, and which is fitted and brazed to the other end of the bellows 4; A threaded portion 5a is formed at the outer end of the electrode rod 5. 6 is a movable electrode soldered to the inner end of the movable electrode rod 5; 7 is a metal tank formed in the shape of a cylinder with a bottom; the open end of the metal tank 7 is fitted and soldered to the step portion 2b. Note that a metallized portion is formed at the brazed portion of the insulating plate 2 with the bellows 4 and the metal tank. Further, the insulating plate 2, the metal tank 7, and the bellows 4 form a vacuum container. A fixed electrode rod 8 is inserted and brazed into the bottom of the metal tank 7. A fixed electrode 9 is brazed to the inner end of the fixed electrode rod 8, and a threaded portion 8a is formed at the outer end.

In FIG. 1, reference numeral 10 denotes a vacuum valve case substrate made of an insulating material.The case substrate 10 has a shape with the apex of an equilateral triangle cut off, and the vacuum valves 1 of each phase are mounted on the case substrate 10 with the fixed side facing upward. Then, the insulating plate 2 is integrally molded on the case substrate 10 and attached in a triangular arrangement. Further, on the case substrate 10, there is an interphase barrier 1 that partitions the vacuum valves 1 of each phase.
0a is integrally formed. Reference numeral 11 denotes a case top cover made of an insulating material that covers the periphery of each vacuum valve 1, and the case top cover 11 is integrally attached to the case substrate 10 by bolts 12 screwed into screw holes 10b provided at the upper center of the partition wall 10a. The fixed electrode rod 8 passes through the case top cover 11, and the fixed side lead 13 is screwed into the threaded portion 8a in the vertical direction. Furthermore, interphase barriers 11 are provided on the upper part of the case top lid 11 to cover the fixed electrode rods 8 and fixed side leads 13 of each phase.
A is integrally formed.

A board 14 is made of an insulating material and is formed in the shape of an equilateral triangle with the apex cut off.The board 14 is fixed to a fixed part such as an outer wall, and the top of the board 14 has a cylindrical shape as shown in FIG. A guide portion 14a is formed. 15 is an insulating frame made of insulating material and formed into a double cylindrical shape connected at the upper part;
The cylindrical portion 15a fits inside the guide portion 14a and its lower end is placed on the substrate 14, and the lower end of the outer cylindrical portion 15b is connected to an annular groove 1 formed on the substrate 14.
4b. Reference numeral 16 denotes a fixed core having a large-diameter head 16a at its upper end.
is fitted into a recess 15c formed in the upper part of the insulating frame 15. The lower end of the fixed iron core 16 is screwed into an embedded nut 17 provided on the base plate 14 and fixed by tightening. An excitation coil 18 is wound between the guide portion 14a and the outer cylinder portion 15b.

On the other hand, the threaded portion 5 of the movable electrode rod 5 of the vacuum valve 1
A suction plate 19 made of a magnetic material is screwed onto a to face the head 16a of the fixed iron core 16.
9 is fixed by tightening a nut 20 which is also screwed onto the threaded portion 5a. A recess 19a is formed in the lower center of the suction plate 20, and the upper end of the movable lead 21 is fitted into the recess 19a, and the upper end is fastened to the screw portion 5a. The movable lead 21 is movably inserted into a shaft hole 16b formed at the center of the fixed iron core 16. A buffer plate 22 made of rubber or the like is attached to the surface of the suction plate 19 facing the head 16a. Reference numeral 10c denotes an interphase barrier integrally formed at the bottom of the substrate 10, and the interphase barrier 10c is a portion between the substrate 10 of each phase and the insulating frame 15, that is, the adsorption plate 19.
Cover the surrounding area. The interphase barrier 10c is placed on top of the insulating frame 15, and the case board 10 is fastened to the board 14 with bolts 23. A threaded portion 21a is provided at the lower end of the movable lead 21, and an adjusting plate 24 is attached to the threaded portion 21a below the board 14.
are screwed together and tightened with a nut 25. 2
Reference numeral 6 denotes a barrier holding plate provided at the bottom of the substrate 14, and cylindrical interphase barriers 26a and 26b are provided at the upper and lower portions of the barrier holding plate 26, respectively, and project upward and downward (the interphase barrier 26a is omitted in FIG. 1). ), the barrier retaining plate 26 is attached to the substrate 14 by bolts.
The interphase barrier 26a is tightened to a fixed portion or attached to a fixed part and is integrated with the substrate 14, and the upper end of the interphase barrier 26a is in contact with the lower surface of the substrate 14. A spring receiving plate 27 is attached to the adjustment plate 2 on the upper surface of the center part of the barrier holding plate 26.
A pressure contact spring 28 is installed between the adjusting plate 24 and the spring receiving plate 27. The movable lead 21 is movably inserted through the center of the spring receiving plate 27 and the barrier holding plate 26, and is attached to the conductive plate 28' by the nut 29, below the barrier holding plate 26.
30, and a lead wire 31 is connected to the conductive plate 28'. The case substrate 10, case top cover 11, substrate 14, insulating frame 15, and barrier holding plate 26, including their respective interphase barrier portions, are made of plastic such as epoxy resin, glass fiber-containing polymer, and premix.

In the vacuum switch having the above configuration, the vacuum valve 1
shows a withstand voltage of 100 KV or more with a metal spacing of 10 mm in an internal vacuum, and also shows a withstand voltage of 50 KV or more along the inner surface of the insulating plate 2, but the withstand voltage is lower on the outer surface of the insulating plate 2 because it is in the atmosphere. As a result, the external creeping voltage of the insulating plate 2 becomes insufficient, leading to an increase in size. Therefore, in the embodiment described above, the insulating plate 2 is integrally molded with the case substrate 10 to improve its external creepage withstand voltage, thereby improving the withstand voltage of the vacuum valve 1 and reducing its size. Further, by arranging the vacuum valves 1 for each phase in a triangular shape, the vacuum switch can be made smaller. Moreover, weight reduction is achieved by molding only the insulating plate 2 without molding the entire vacuum valve 1. Furthermore, since the live parts are covered for each phase by the interphase barriers 10a, 10c, 11a, 26a, 26b and the insulating frame 15, the distance between the phases can be shortened, and the overall size can be reduced by this. There is. Further, by arranging the leads 13 and 21 in the vertical direction (in the axial direction of the vacuum valve 1), the space can be reduced.

On the other hand, in the operation device section, the excitation coil 18 is energized to attract the adsorption plate 19 to the head 16a of the fixed core via the buffer plate 22 against the pressure contact spring 28, and the vacuum valve 1 is operated to open. Furthermore, when the excitation coil 18 is demagnetized, the pressure contact spring 28 presses the adjustment plate 24 and moves upward, which causes the movable electrode rod 5 to move upward via the movable lead 21 and the suction plate 19, and each electrode 6,
9 is pressed and the vacuum valve 1 is turned on. The spacing between the adjustment plate 24 and the spring receiving plate 27 is made slightly larger than the spacing between the buffer plate 22 and the head 16a so as not to hinder suction. When adjusting the opening distance, loosen the nut 20 and remove the suction plate 19 and the movable lead 21.
The distance between the buffer plate 22 and the fixed iron core 16 is adjusted by adjusting the degree of screwing into the threaded portion 5a. This adjustment causes the movable lead 21 to move up and down slightly, causing a change in the pressure contact force of the pressure contact spring 28, so that the degree to which the adjusting plate 24 is screwed into the threaded portion 21a is also adjusted. If it is difficult to rotate the suction plate 19 due to assembly reasons, the opening distance is adjusted by rotating the adjustment plate 24.

As mentioned above, in the vacuum switch of the present invention,
The movable lead is movably inserted into the center of the fixed core with an excitation coil around it, and an adjustment plate that holds one end of the pressure spring is screwed onto the lower end of the movable lead. By using it as a part of the operating device and inserting it through the center of the fixed core, the configuration of the operating device including the movable lead can be made compact. In addition, the opening distance is adjusted by rotating the suction plate, and the pressure contact force is adjusted by rotating the adjustment plate, so the opening distance and pressure contact force can be adjusted separately. Adjustments can be made more accurately. Further, if it is difficult to rotate the suction plate due to assembly reasons, the opening distance can be adjusted by rotating the adjustment plate. Furthermore, the pressure contact spring can reduce the impact that is applied to the operating device when the insulation is cut off.

[Brief explanation of drawings]

Fig. 1 is a partially omitted perspective view of the vacuum switch according to the present invention, Fig. 2 is a partially longitudinal sectional front view of the vacuum valve, and Fig. 3 is a longitudinal sectional front view of the operating device portion of the vacuum switch according to the present invention. . 1... Vacuum valve, 5... Movable electrode rod, 16...
... Fixed iron core, 18 ... Excitation coil, 19 ... Adsorption plate, 21 ... Movable side lead, 24 ... Adjustment plate, 2
7... Spring receiving plate, 28... Pressure contact spring.

Claims (1)

[Scope of utility model registration request] A fixed core with an excitation coil around it, a suction plate screwed onto the fixedly supported movable electrode of the vacuum valve so as to face the fixed core, and a suction plate with one end attached to the movable electrode and the center of the fixed core. A movable lead is movably inserted into a hole provided in the movable lead, an adjustment plate screwed onto the other end of the movable lead, a spring receiving plate fixed opposite to the adjustment plate, and a spring between the adjustment plate and the spring. A vacuum switch characterized by comprising a pressure contact spring provided between a receiving plate.