JP4312058B2 - Gas container connection structure - Google Patents

Description

  The present invention relates to a structure for connecting a plurality of gas containers each having an electrical device stored therein, such as a gas-insulated switchgear in which each electrical device is stored in a gas container for each line unit.

  Conventionally, in switchgear, various electric devices such as circuit breakers and disconnectors are individually housed in each gas container, and an insulating gas is enclosed in the container to increase the withstand voltage performance of each electric device. Some devices are designed to reduce the overall size of the apparatus.

  In such a switchgear, it is necessary to electrically draw out the electric equipment stored in each gas container to the outside of the container. The circuit conductor is provided, and a bushing for electrically insulating between the partition wall of the gas container and the circuit conductor is interposed.

  Moreover, in the prior art, there is one that adopts a configuration in which the partition walls adjacent to each other in the gas container are integrally fixed to the bushing in order to increase the density of the entire apparatus (see, for example, Patent Documents 1 and 2). FIG. 5 shows an example of a conventional configuration in which the adjacent partition walls of the gas container are fixed to the bushing.

  In the example shown in FIG. 5, an insulating bushing 53 made of a synthetic resin or the like is provided between the partition walls 51 a and 52 a adjacent to each other of the two gas containers 51 and 52. A buried metal 54 having a female screw part 54a is embedded in each side of the direction. In this case, the bushing 53 and each buried metal 54 are integrally cast by an insert mold or the like. The partition walls 51 a and 52 a of the gas containers 51 and 52 are integrally coupled to the bushing 53 by screwing bolts 56 into the female screw portions 54 a of the buried metal 54. Reference numeral 58 denotes an O-ring for gas sealing provided between the partition walls 51 a and 52 a of the gas containers 51 and 52 and the bushing 53.

Japanese Patent Laid-Open No. 06-014424 JP 07-264754 A

  However, in the case of the conventional configuration shown in FIG. 5, when two gas containers 51, 52 are connected via the bushing 53, the amount of buried metal 54 corresponding to the number of bolts 56 to be used is necessary. When, for example, a thermosetting resin is used as a molding material for the bushing 53, the bushing 53 to be molded is thermally distorted as the number of the deposits 54 increases, because the bushing 53 is gradually cured from a high temperature portion. And residual stress is likely to occur. When such thermal strain and residual stress are generated in the bushing 53, defects such as cracks and sink marks are caused, and the gas tightness in the gas containers 51 and 52 is lost.

  Further, when molding the bushing 53 containing the buried metal 54, resin molding is performed after the buried metal 54 is placed in the mold. Therefore, the larger the number of buried metals 54, the more preparation for resin molding is performed. It will take time and effort.

  The present invention has been made in order to solve the above-described problems, and reduces the number of buried metal to be embedded in the bushing to suppress the occurrence of thermal distortion and residual stress in the bushing and at the time of resin molding. An object of the present invention is to provide a gas container connection structure capable of reducing labor and time required for preparation of the gas container.

In order to achieve the above object, according to the present invention, there are two gas containers in which an electric device is housed, and a circuit conductor sandwiched between partition walls of the two gas containers and connected to the electric device. And an insulating bushing penetrating through the bushing and embedded in the bushing so that both end surfaces are exposed to the outside of the bushing, and female screw portions are formed independently from each other from the both end surfaces toward the inside. The partition walls adjacent to each other are integrally coupled to the bushing by a buried metal and a fastener screwed through the partition walls from the inner surface of the gas container to each of the female screw portions . .

  According to the present invention, when the gas container is fixed to the bushing, it is only necessary to provide one buried metal for the two fasteners. Can do. For this reason, it can suppress that a thermal distortion and a residual stress generate | occur | produce in a bushing, and it becomes possible to reduce generation | occurrence | production of defects, such as a crack and a sink. In addition, the labor and time required for preparation for resin molding can be reduced by the amount that the number of buried metal to be embedded in the bushing is reduced.

  Hereinafter, the case where the gas container connection structure of the present invention is applied to a switchgear will be described as an example.

Embodiment 1 FIG.
1 is a cross-sectional view showing a gas-insulated switchgear of a switchgear according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged cross-sectional view showing a connecting portion of two equipment units constituting the gas-insulated switchgear of FIG. 3 is a cross-sectional view showing only the portion where the partition walls of the two gas containers are fixed to the bushing in FIG.

The switchgear gas-insulated switchgear according to the first embodiment includes two device units 1 and 2. One device unit 1 contains a circuit breaker 4 inside a gas container 3, and the other device unit 2 contains a disconnector 6 inside a gas container 5. In addition, in each gas container 3, 5, for example, an insulating gas such as SF ₆ gas is enclosed in order to enhance the withstand voltage performance of each device 4, ₆ .

  Furthermore, circuit conductors 7a to 7g are sequentially connected to the circuit breaker 4 and the disconnecting device 6 housed in the gas containers 3 and 5, respectively. Since a high voltage is applied to these circuit conductors 7a to 7g, the circuit conductors 7a, 7d and 7g penetrating the gas containers 3 and 5 need to be electrically insulated from the gas containers 3 and 5. Therefore, bushings 8, 9, and 10 formed by molding an insulating material such as an epoxy resin are interposed between the circuit conductors 7a, 7d, and 7g and the gas containers 3 and 5, for example. The gas containers 3 and 5 are grounded.

  In particular, in the first embodiment, the partition walls 3a and 5a adjacent to each other of the gas containers 3 and 5 are fixed to the bushing 9 in order to increase the density of the entire apparatus. That is, the bushing 9 has a cylindrical portion 9a through which the circuit conductor 7d is inserted, and a flange portion 9b projecting radially outward from the cylindrical portion 9a, and is embedded in the flange portion 9a by an insert mold or the like. Gold 12 is embedded in one piece.

  The buried metal 12 is buried with both end faces exposed to the outside in the thickness direction of the flange portion 9 b of the bushing 9. That is, the axial length of the buried metal 12 is set to be substantially the same as the thickness of the flange portion 9b. Then, female screw portions 12a and 12b are formed independently from each other from both end faces of the buried metal 12 toward the inside.

  The bolts 14 as fasteners are screwed to the female screw portions 12a and 12b of the buried metal 12 via the partition walls 3a and 5a and the washer 15, so that the gas containers 3 and 5 are integrated with the bushing 9. Is bound to. Reference numerals 16 and 17 denote gas seal O-rings provided between the partition walls 3 a and 5 a of the gas containers 3 and 5 and the bushing 9.

  As described above, in the first embodiment, when the gas containers 3 and 5 are fixed to the bushing 9, it is only necessary to provide one buried metal 12 for the two bolts 14. The number of gold 12 can be halved compared to the conventional case. For this reason, it can suppress that a thermal distortion and a residual stress generate | occur | produce in the bushing 9, and it becomes possible to reduce generation | occurrence | production of defects, such as a crack and a sink. In addition, the labor and time required for preparation for resin molding can be reduced by the amount corresponding to the reduction in the number of buried metal 12 to be embedded in the bushing 9.

Embodiment 2. FIG.
FIG. 4 is a cross-sectional view showing only the portion in which the partition walls of the two gas containers are fixed to the bushing in the second embodiment of the present invention, and corresponds to the first embodiment shown in FIGS. Parts are denoted by the same reference numerals.

  The feature of the second embodiment is that the female screw portions 13a and 13b formed inward from the both end faces of the buried metal 13 embedded in the flange portion 9b of the bushing 9 are opposed to each other. In other words, it is formed in a state in which the position is shifted in a direction orthogonal to the thickness direction of the buried metal 13. Since other configurations are the same as those in the first embodiment, detailed description thereof is omitted here.

  If the configuration as in the second embodiment is adopted, the thickness of the flange portion 9b of the bushing 9 can be further reduced. Therefore, in addition to the operation and effect of the first embodiment, the density of the entire apparatus is increased. This is even more advantageous.

  In the first and second embodiments, the case where the present invention is applied to the switch gear has been described. However, the present invention is not limited to this, and two gas containers adjacent to each other are fixed to the bushing. Any structure can be applied widely. Moreover, as a fastener, it can replace with the volt | bolt 14 and can also be fastened with a screw | thread etc. As shown in FIG.

It is sectional drawing which shows the gas insulated switchgear of the switchgear in Embodiment 1 of this invention. It is sectional drawing which expands and shows the connection part of two apparatus units which comprise the gas insulated switchgear of FIG. It is sectional drawing which takes out only the part which fixed the partition of the two gas containers to the bushing in FIG. In Embodiment 2 of this invention, it is sectional drawing which takes out and shows only the part which fixed the partition of the two gas containers to the bushing. It is sectional drawing which shows an example of the conventional structure which fixed each partition of the gas container adjacent to each other via the bushing.

Explanation of symbols

3 Gas container, 3a partition, 4 Circuit breaker (electrical equipment), 5 Gas container, 5a Partition,
6 disconnector (electrical equipment), 7a-7g circuit conductor, 9 bushing, 12 buried metal,
12a, 12b female thread, 13 buried, 13a, 13b female thread,
14 bolts (fasteners).

Claims (2)

Two gas containers in which electrical equipment is housed , an insulating bushing that is sandwiched between partition walls of the two gas containers and connected to the electrical equipment, and both end faces are A buried metal embedded in the bushing so as to be exposed to the outside of the bushing and having female screw portions formed independently from each other inward from the both end faces, and an internal surface of the gas container in each of the female screw portions. A connecting structure for a gas container, wherein each partition wall adjacent to each other is integrally coupled to the bushing by a fastener screwed through the partition wall . 2. The gas according to claim 1, wherein the female screw portions formed in the buried metal are formed so as to be shifted in a direction perpendicular to the thickness direction of the buried metal without facing each other. Container connection structure.

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