JP2021114419A - Vacuum switchgear - Google Patents

Abstract

To reduce the size of a mold required for resin molding, and reduce the cost, and improve a manufacturing time and yield.SOLUTION: A vacuum switchgear according to the present invention includes a vacuum valve in which a fixed side electrode and a movable side electrode that face each other are stored, an operation mechanism unit that drives the movable side electrode, and an operating insulating rod that connects the movable electrode and the operating mechanism, the circumference of the vacuum valve and the operating insulating rod is covered with a resin mold portion, and the resin mold portion has a divided structure.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vacuum switchgear, and more particularly to a vacuum switchgear suitable for a vacuum valve and an insulating rod for operation covered with a resin mold portion.

As a prior art relating to a vacuum switchgear including a vacuum circuit breaker and a vacuum disconnector, there is a vacuum circuit breaker described in Patent Document 1.

In Patent Document 1, a vacuum valve formed by integrally casting (molding) with a solid insulator such as an epoxy resin (the circumference is covered with a resin mold portion) and the periphery of a fixed-side cable bushing conductor are molded. For operation where the fixed side cable bushing is molded, the movable side cable bushing where the outer circumference of the movable side cable bushing conductor is molded, and the movable side electrode is covered with a resin mold part like a vacuum valve. A vacuum circuit breaker roughly composed of an operation mechanism unit operated via an insulating rod is described.

Japanese Unexamined Patent Publication No. 2018-147643

In the vacuum breaker of Patent Document 1 described above, the circumference of the vacuum valve and the insulating rod for operation is covered with a resin mold portion, and this resin mold portion is solidified by pouring a liquid resin into a metal mold. It is molded integrally.

However, when the resin is manufactured as an integral body, a mold corresponding to the size of the resin is required, so that the cost of the mold is increased, the volume to be molded is large, and the manufacturing time is long. If this fails, the entire molded product becomes defective, and there is a problem that the yield is difficult to increase.

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 which requires a small mold for molding a resin and has improved cost, manufacturing time, and yield. There is.

In order to achieve the above object, the vacuum opening / closing device of the present invention includes a vacuum valve in which a fixed side electrode and a movable side electrode facing each other are stored, an operation mechanism unit for driving the movable side electrode, and the movable side. A vacuum opening / closing device including an operating insulating rod that connects an electrode and the operating mechanism portion, and the vacuum valve and the operating insulating rod are surrounded by a resin mold portion. The resin mold portion is a vacuum opening / closing device. It is characterized by having a divided structure.

According to the present invention, the mold required for molding the resin can be made small, and the improvement of cost, manufacturing time, and yield can be improved.

It is sectional drawing except the operation mechanism part which shows Example 1 of the vacuum switchgear of this invention. It is sectional drawing except the operation mechanism part which shows Example 2 of the vacuum switchgear of this invention. It is sectional drawing except the operation mechanism part which shows Example 3 of the vacuum switchgear of this invention. It is sectional drawing except the operation mechanism part which shows Example 4 of the vacuum switchgear of this invention. It is sectional drawing except the operation mechanism part which shows Example 5 of the vacuum switchgear of this invention. It is sectional drawing except the operation mechanism part which shows Example 6 of the vacuum switchgear of this invention. Example 7 of the Vacuum Switchgear of the Present Invention It is a cross-sectional view excluding the operation mechanism part which shows Example 1 of the vacuum switchgear of this invention. It is sectional drawing which excludes the operation mechanism part which shows.

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 Example 1 of the vacuum switchgear of the present invention.

As shown in the figure, the vacuum opening / closing device 30A of this embodiment is a vacuum valve 1 formed by being integrally cast (molded) with a solid insulator such as an epoxy resin (the periphery is covered with a resin mold portion 22). The fixed side cable bushing 2 in which the periphery of the fixed side cable bushing conductor 15 is molded, the movable side cable bushing 3 in which the outer periphery of the movable side cable bushing conductor 16 is molded, and the movable side electrode 13 described later. It is roughly composed of an operation mechanism unit 4 for operating the above. Usually, the vacuum valve 1 integrally cast with a solid insulating material such as epoxy resin is called a molded vacuum valve. Although not particularly shown, the resin mold portion 22 is normally grounded.

The vacuum valve 1 described above is joined to the fixed side end plate 6 joined to one end of the cylindrical insulating material 5, the fixed side conductor 7 airtightly penetrating the fixed side end plate 6, and the other end of the cylindrical insulating material 5. One end is joined to the movable side end plate 8 and the movable side end plate 8 to allow the movable part to be driven. It is composed of a movable side conductor 10, and its internal pressure is maintained in a vacuum of ^{about 10 -4 Pa or less.}

Inside the vacuum valve 1, the floating potential metal 11 supported by the cylindrical insulating material 5, the fixed electrode 12 connected to the end of the fixed conductor 7, and the end of the movable conductor 10 are connected. The movable side electrode 13 is arranged.

The movable side conductor 10 is connected to an operating insulating rod 14 whose circumference is covered with a resin mold portion 22, and the operating insulating rod 14 is housed in the operating mechanism portion 4 to form a wipe mechanism that applies a contact load to the electrode pair. It is connected to the connected operator. The surrounding space of the operating insulating rod 14 (between the operating insulating rod 14 and the resin mold portion 22) is filled with an insulating gas 18 such as air or sulfur hexafluoride to form an atmospheric pressure portion.

Further, the movable side electrode 13 is driven via the operating insulating rod 14 in conjunction with the drive of the actuator (not shown), so that the fixed side electrode 12 and the movable side electrode 13 are brought into contact with each other, that is, the vacuum valve 1 is opened. You can switch between the closed state and the closed state. The vacuum valve 1 in FIG. 1 shows an open state.

The fixed-side cable bushing 2 electrically connects the fixed-side cable bushing conductor 15 to the fixed-side conductor 7 of the vacuum valve 1, and the movable-side cable bushing 3 electrically connects the movable-side cable bushing conductor 16 to the vacuum valve 1. It is arranged on the side and integrally cast with a solid insulator such as epoxy resin together with the vacuum valve 1, and the movable side conductor 10 and the movable side cable bushing conductor 16 of the vacuum valve 1 are in contact with each other so as to be slidable and energized. It is electrically connected via the child 17, and can be operated by connecting a power supply side cable and a load side cable (not shown) to the fixed side cable bushing 2 and the movable side cable bushing 3, respectively.

Further, in the vacuum switchgear 30A of the present embodiment, the vacuum valve 1, the operating insulating rod 14 and the operating mechanism portion 4 are arranged substantially in a straight line, and the vacuum valve 1 and the operating insulating rod 14 are surrounded by each other. It has a configuration in which a fixing member 19 is provided so as to straddle the resin mold portion 22 and the operation mechanism portion 4 to cover and fix both integrally.

The vacuum valve 1 side of the fixing member 19 has a plurality of mold overhanging portions (molded integrally with the resin mold portion 22) 20a and 20b in which insert nuts provided so as to project to the outside of the side surface of the resin mold portion 22 are embedded. The operation mechanism portion 4 side of the fixing member 19 is directly fixed to the housing of the operation mechanism portion 4 by the fastening means bolts 21c and 21d (operation mechanism portion). 4 does not have an overhang, but it may be).

The vacuum switchgear 30A of this embodiment has a resin mold portion 22 having a divided structure. Specifically, the split portion 22A of the resin mold portion 22 is positioned at the resin mold portion 22 around the insulating rod 14 for operation, and the split portion 22A is located at the atmospheric pressure portion (non-vacuum portion). (The divided surface of the divided portion 22A is coated with an adhesive to connect the divided surfaces).

With this configuration, the resin mold portion 22 is divided, so that the mold required for molding the resin can be reduced, and the cost, manufacturing time, and yield can be improved accordingly. Further, since the position of the divided portion 22A of the resin mold portion 22 is set to the atmospheric pressure portion (non-vacuum portion), the effect of fundamentally eliminating the risk of vacuum leakage in the divided structure can be obtained. ..

Further, the portion of the divided resin mold portion 22 located on the vacuum side (vacuum valve 1) has a higher withstand voltage than the resin mold portion 22 located on the atmospheric pressure portion (non-vacuum side), or The portion of the divided resin mold portion 22 located on the vacuum side (vacuum valve 1 side) has a smaller number of bubbles per unit area than the resin mold portion 22 located on the atmospheric pressure portion (non-vacuum side). By doing so, the resin mold portion 22 on the vacuum side (vacuum valve 1 side) is manufactured by vacuum casting or vacuum pressure casting, and the resin mold portion 22 on the atmospheric pressure portion (non-vacuum side) is pressurized casting or the like. By manufacturing by the manufacturing method having a higher throughput, the effect of improving the manufacturing throughput can be obtained while ensuring the necessary insulation performance for the resin mold portion 22.

The divided portion 22A of the resin mold portion 22 is preferably located within the range of the insulated portion of the operating insulating rod 14 (the shaded portion in FIG. 1: the range of L).

Therefore, according to this embodiment, the mold required for molding the resin can be made small, and the improvement of cost, manufacturing time, and yield can be improved.

FIG. 2 shows Example 2 of the vacuum switchgear of the present invention. The description of the same parts as in the first embodiment will be omitted.

In the vacuum switchgear 30B of the present embodiment shown in the figure, a step is formed on each of the divided surfaces of the divided portion 22B of the resin mold portion 22, and both of the resin mold portions 22 divided through the step portion are formed. It is connected. Other configurations are the same as in the first embodiment.

Even with the vacuum switchgear 30B of the present embodiment configured in this way, the same effect as that of the first embodiment can be obtained, and of course, a step is formed on the divided surface of the divided portion 22B, so that the divided portion is formed. Since the coating area of the adhesive on the divided surface of 22B is improved, the effect of improving the mutual connection strength and increasing the mechanical strength can be obtained.

FIG. 3 shows Example 3 of the vacuum switchgear of the present invention. The description of the same parts as in the first embodiment will be omitted.

In the vacuum switchgear 30C of the present embodiment shown in the figure, the stepped portion of the divided portion 22B of the resin mold portion 22 of the resin mold portion 22 of the second embodiment shown in FIG. The split portion 22C is used. Other configurations are the same as in the first embodiment.

Even if the vacuum switchgear 30C is configured in this way, the same effect as in the second embodiment can be obtained.

FIG. 4 shows Example 4 of the vacuum switchgear of the present invention. The description of the same parts as in the third embodiment will be omitted.

The vacuum switchgear 30D of the present embodiment shown in the figure is a divided portion in which the central portion on one side of the divided portion protrudes in the axial direction, as in the case of the third embodiment. A plurality of projecting portions projecting in the axial direction are formed at predetermined intervals in the circumferential direction, and the axial lengths of the projecting portions whose central portion projects in the axial direction are different in the middle of the circumferential direction. There is. That is, the axial length of the protruding portion of the lower split portion 22D2 is formed larger than that of the upper split portion 22D1 in the cross section of the resin mold portion 22 of FIG. Other configurations are the same as in Example 3.

According to the vacuum switchgear 30D of the present embodiment configured in this way, the same effect as that of the third embodiment can be obtained, and of course, the axial length of the protruding portion is changed in the middle of the circumferential direction to divide the device. The positions of the two resin mold portions 22 in the rotation direction can be regulated, which has the effect of facilitating positioning during assembly.

FIG. 5 shows Example 5 of the vacuum switchgear of the present invention. The description of the same parts as in the third embodiment will be omitted.

The vacuum switchgear 30E of the present embodiment shown in the figure is a divided portion in which the central portion on one side of the divided portion protrudes in the axial direction, as in the case of the third embodiment. A plurality of projecting portions projecting in the axial direction are formed at predetermined intervals in the circumferential direction, and the radial widths of the projecting portions whose central portions project in the axial direction are different. That is, the radial width t2 of the protruding portion of the lower split portion 22E2 is formed larger than the radial width t1 of the protruding portion of the upper split portion 22E1 in the cross section of the resin mold portion 22 of FIG. Other configurations are the same as in Example 3.

According to the vacuum switchgear 30E of the present embodiment configured in this way, the same effect as that of the third embodiment can be obtained, and of course, the two divided parts are divided due to the difference in the radial width of the protruding portion. The position of the resin mold portion 22 in the rotation direction can be regulated, which has the effect of facilitating positioning during assembly.

FIG. 6 shows Example 6 of the vacuum switchgear of the present invention. The description of the same parts as in the second embodiment will be omitted.

In the vacuum switchgear 30F of the present embodiment shown in the figure, a step is formed on each of the divided surfaces of the divided portion 22B of the resin mold portion 22, and the stepped portion is formed in the same manner as in the second embodiment shown in FIG. Both of the resin mold portions 22 divided via the plurality of parts are connected to each other, and both of the divided resin mold portions 22 are connected to the stepped portion of the divided portion 22B with an adhesive. , The adhesive protrudes to the inner peripheral side of the resin mold portion 22 to form the protrusion 23. Other configurations are the same as in the second embodiment.

The vacuum switchgear 30F of the present embodiment configured in this way can obtain the same effect as that of the second embodiment, and of course, the adhesive protruding to the inner peripheral side of the resin mold portion 22 becomes a protrusion 23. The protrusions 23 prevent the movement of dust inside the resin mold portion 22, which has the effect of improving reliability.

FIG. 6 shows Example 7 of the vacuum switchgear of the present invention. The description of the same parts as in the second embodiment will be omitted.

In the vacuum switchgear 30G of the present embodiment shown in the figure, a step is formed on each of the divided surfaces of the divided portion 22B of the resin mold portion 22, and the stepped portion is formed in the same manner as in the second embodiment shown in FIG. Although both of the resin mold portions 22 divided via the resin mold portion 22 are connected to each other, the adhesive protruding to the inner peripheral side of the resin mold portion 22 is not used as the protrusion 23 as in the sixth embodiment. The protrusion 24 is provided on the inner peripheral side of the end portion of the stepped portion of the divided resin mold portion 22. Other configurations are the same as in the second embodiment.

The vacuum switchgear 30G of the present embodiment configured in this way can obtain the same effect as that of the sixth embodiment, and of course, the protrusion 24 of the present embodiment can be manufactured at the time of molding the resin mold portion 22. It is also possible to manufacture a large protrusion 24, and if the protrusion 24 is large, the ability to prevent the movement of dust is improved.

In the above example, the protrusion 24 is provided on the inner peripheral side of the end of the stepped portion of the divided resin mold portion 22, but the inner peripheral side of the end of the stepped portion of the divided resin mold portion 22 is the other inner peripheral side. It may be formed thick so as to protrude more inward.

Of course, the same effect as described above can be obtained with this configuration, and in the case of integrally molding the resin mold portion 22 as in the conventional case, if there is a protrusion 24 or a protrusion such as the wall thickness in the middle, the inner gold Since the mold cannot be removed, it was impossible to form the protrusion 24 or the wall thickness in the first place, but this can only be realized because the resin mold portion 22 has a divided structure, that is, a structure in which the mold can be divided. It can be said that the effect is remarkable.

In the above-mentioned Examples 1-7, by roughening the divided surface of the resin mold portion 22, the coated surface area of the adhesive is improved, and the adhesive strength can be expected to be improved.

Further, normally, a conductive layer is provided on the outer surface of the resin mold portion 22, but when this conductive layer is provided, a coating film, heat shrinkage or self-melting is performed on the outer surface of the divided portion of the resin mold portion 22. A adhesive sheet or tape may be applied, and a conductive layer may be provided on the outer surface of the resin mold portion 22 in this state.

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 valve, 1A ... Vacuum valve mold part, 2 ... Fixed side cable bushing, 3 ... Movable side cable bushing, 4 ... Operation mechanism part, 5 ... Cylindrical insulating material, 6 ... Fixed side end plate, 7 ... Fixed side Conductor, 8 ... Movable side end plate, 9 ... Bellows, 10 ... Movable side conductor, 11 ... Floating potential metal, 12 ... Fixed side electrode, 13 ... Movable side electrode, 14 ... Operating insulating rod, 15 ... Fixed side cable bushing Conductor, 16 ... Movable side cable bushing conductor, 17 ... Contact, 18 ... Insulating gas, 19 ... Fixing member, 20a, 20b ... Mold overhang, 21a, 21b, 21c, 21d ... Bolt, 22 ... Resin mold, 22A , 22B, 22C, 22D1, 22D2, 22E1, 22E2 ... Divided part of resin mold part, 23 ... Projection of protruding adhesive, 24 ... Projection, 30A, 30B, 30C, 30D, 30E, 30F, 30G ... Vacuum opening / closing device ..

Claims (15)

A vacuum valve in which a fixed side electrode and a movable side electrode facing each other are stored, an operation mechanism unit for driving the movable side electrode, and an operating insulating rod for connecting the movable side electrode and the operation mechanism part are provided. , A vacuum opening / closing device in which the circumference of the vacuum valve and the insulating rod for operation is covered with a resin mold portion.
The resin mold portion is a vacuum switchgear characterized by having a divided structure. The vacuum switchgear according to claim 1.
A vacuum switchgear characterized in that the divided portion of the resin mold portion is located in a non-vacuum portion. The vacuum switchgear according to claim 2.
The non-vacuum portion is a vacuum switchgear characterized by being an atmospheric pressure portion. The vacuum switchgear according to any one of claims 1 to 3.
A vacuum switchgear characterized in that the divided portion of the resin mold portion is located in the range of the insulated portion of the operating insulating rod. The vacuum switchgear according to any one of claims 2 to 4.
A vacuum switchgear characterized in that a portion of the divided resin mold portion located on the vacuum side has a higher withstand voltage than the resin mold portion located on the non-vacuum side. The vacuum switchgear according to any one of claims 2 to 5.
A vacuum switchgear characterized in that a portion of the divided resin mold portion located on the vacuum side has a smaller number of bubbles per unit area than the portion of the resin mold portion located on the non-vacuum side. The vacuum switchgear according to any one of claims 1 to 6.
A vacuum switchgear characterized in that a step is formed on each of the divided surfaces of the divided portion of the resin mold portion, and both of the divided resin mold portions are connected via the step portion. The vacuum switchgear according to claim 7.
A vacuum switchgear characterized in that the stepped portion of the divided portion of the resin mold portion has a central portion on one side of the divided portion protruding in the axial direction. The vacuum switchgear according to claim 8.
A plurality of the projecting portions having the central portion projecting in the axial direction are formed at predetermined intervals in the circumferential direction, and the projecting portion having the central portion projecting in the axial direction in the middle of the circumferential direction of the projecting portion. A vacuum switchgear characterized by different axial lengths. The vacuum switchgear according to claim 8.
A plurality of the projecting portions having the central portion projecting in the axial direction are formed at predetermined intervals in the circumferential direction, and the radial width of each of the projecting portions projecting in the axial direction is large. A vacuum switchgear characterized by being different. The vacuum switchgear according to claim 7.
Both of the divided resin mold portions are connected to the stepped portion of the divided portion with an adhesive interposed therebetween, and the adhesive protrudes to the inner peripheral side of the resin mold portion to form a protrusion. A vacuum switchgear characterized by being The vacuum switchgear according to claim 7.
A vacuum switchgear characterized in that a protrusion is provided on the inner peripheral side of the end portion of the stepped portion of the divided resin mold portion. The vacuum switchgear according to claim 7.
A vacuum switchgear characterized in that the inner peripheral side of the end portion of the stepped portion of the divided resin mold portion is formed to be thick so as to protrude inward from the other inner peripheral side. The vacuum switchgear according to any one of claims 1 to 13.
A vacuum switchgear characterized in that the divided surface of the resin mold portion is roughened. The vacuum switchgear according to any one of claims 1 to 14.
A vacuum switchgear characterized in that a coating film, a sheet or a tape is applied to the outer surface of the divided portion of the resin mold portion, and a conductive layer is installed on the outer surface of the resin mold portion in this state.

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