JP4494661B2 - Gas insulated switchgear container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure-proof reinforcement structure provided on the side wall inner surface side of a container for gas insulated switchgear, and more specifically, in order to improve the pressure resistance strength of a relatively long side wall of a rectangular container, The present invention relates to a pressure-proof reinforcement structure provided on an inner surface of an intermediate portion.
[0002]
[Prior art]
A container for a gas insulated switchgear (hereinafter also referred to as a container) needs to have mechanical strength that can withstand the gas pressure, and requires an electric field relaxation structure without sharp edges as electrical performance inside the container. In particular, when the pressure receiving area of the container side wall is wide, it is necessary to improve the pressure resistance strength by attaching a reinforcing member. However, the reinforcing member has the following electric field relaxation structure. This will be described with reference to FIGS.
6 is a perspective view of the container with the flange side wall removed, FIG. 7 is an end view of the BB line portion of FIG. 6, FIG. 8 is an enlarged plan view of the reinforcing structure portion, and FIG. 9 is another reinforcing structure portion. FIG. 10 is an enlarged plan view of still another reinforcing structure.
[0003]
6 and 8, the figure shows the container 7 with the side walls (not shown) on the flanges 3 and 4 side removed, and the reinforcing structure in the container 7 is the center in the longitudinal direction of the container side walls 11a and 11b. In addition, the reinforcing members 8a and 8b, which are thick plates having edges, are vertically crossed and joined by welding or the like, and then are rounded to relax the electric field at the tips of the edges inside the containers of the reinforcing members 9a and 9b (hereinafter referred to as the round shape). , Also referred to as an R shape), for example, shield members 9a and 9b formed to have a radius of about 10 mm are fixed to the reinforcing members 8a and 8b with fastening members 10 such as bolts.
[0004]
FIG. 9 shows a reinforcing structure using another reinforcing member 12. In order to alleviate the electric field on the container side wall 11b, machining such as cutting is performed in advance, and the edge located inside the container is shown. A reinforcing member 12 having a R-shaped tip, for example, about R10 mm, is joined to the container side wall 11b by welding or the like.
In this reinforcing structure, the apparent structure is simplified as compared with the reinforcing structures shown in FIGS. 6 and 8, but the manufacturing cost is high because cutting is required.
[0005]
FIG. 10 shows an example in which a reinforcing member 13 having a U-shaped cross section described in JP-A-10-164711 is used. The container of the reinforcing member 13 having a U-shaped cross section is used. The attachment to the side walls (11a) and 11b, that is, welding, is performed so as to seal the U-shaped inner part 14.
[0006]
[Problems to be solved by the invention]
In the conventional reinforcing structure, for example, in the reinforcing structure in which the shield members 9a and 9b are assembled to the reinforcing members 8a and 8b shown in FIG. 6 to FIG. 8, the number of components increases, and assembly work takes time. In addition, it is necessary to provide a screw hole for screwing the fastening member 10, or shield members 9 a and 9 b are required as separate members for electric field relaxation, and the shield members 9 a and 9 b are rounded for electric field relaxation ( (R shape), etc., and complicated processing and assembly work are required.
[0007]
Further, even in the reinforcing structure using the reinforcing member 12 as a single product shown in FIG. 9, machining work such as cutting for applying an R shape for electric field relaxation is required.
As described above, in any of the above-described reinforcing structures, the production requires complicated work and time, and the manufacturing cost increases.
[0008]
Also, as shown in FIG. 10, the cross section is formed in a substantially U-shape, and when attaching to the container side walls 11a and 11b, both ends are the bottom and top surfaces of the container 1 or a lid not shown. There is a reinforcing member 13 which is closed with a member and the U-shaped inner portion 14 has a sealing structure.
In this case, although it is satisfactory in terms of strength, it has to be welded so as to seal the U-shaped inner part 14 for installation, and a high level of skill is required for the welding operation.
[0009]
This is because if the sealing of the U-shaped inner part 14 is incomplete, the air in the U-shaped inner part 14 leaks into the container 1 before the insulating gas is sealed in the container 1 and the evacuating process takes a long time. If rust occurs in the U-shaped interior 14 (the U-shaped interior 14 is not painted), the rust comes out of the incompletely sealed portion into the container 1 and insulates the gas-insulated switchgear. It causes inconvenience such as deterioration of performance.
On the other hand, if the U-shaped inner part 14 is not sealed from the beginning, rust and fragments generated in the U-shaped inner part 14 that are difficult to inspect from the outside will occasionally splash into the container 1 and the insulation performance of the gas-insulated switchgear. Damage.
For this reason, the U-shaped interior 14 has to be surely made into a sealed structure by welding from the beginning of attachment.
In addition, it is difficult to evacuate the U-shaped interior 14 from the beginning in such welding work, and it is further difficult to maintain the vacuum state. Under such circumstances, air is inevitably left in the U-shaped interior 14, and the above problem has occurred.
[0010]
An object of the present invention is to solve the above-described problems, and to provide a container for a gas insulating device that is easy to manufacture, has a low manufacturing cost, and has a high pressure strength.
[0011]
[Means for Solving the Problems]
Gas insulated switchgear container according to the invention, the reinforcing member of only the proximal portion has a bend portion is shaped plate attached to the inner surface of the container sidewall for field relaxation formed by bending the R shape in cross-section The container side wall to which the reinforcing member is attached is formed so as to protrude outward so that the internal volume of the container is increased .
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
In the gas insulated switchgear container according to Embodiment 1, the reinforcing member itself attached to the inner surface of the container side wall is formed by bending one thin plate-like member, and further on the container side wall. In the cross section of the reinforcing member in the attached state, the R shape for electric field relaxation provided in the reinforcing member is also formed by bending so as to relax the electric field.
In this form 1, the reinforcing member is bent and formed in a substantially J shape in the cross section, and the side edge on the upper end side of the J shape in the cross section is attached in a state of being in vertical contact with the inner surface of the container side wall. This is a configuration.
Hereinafter, this will be described with reference to FIGS. 1 is a perspective view of a gas-insulated switchgear container (with the side wall on the flange side removed), FIG. 2 is an end view taken along line AA of FIG. 1, and FIG. 3 is a partially enlarged view.
[0017]
1 to 3, the reinforcing members 2a and 2b attached to the center in the length direction of the container side walls 5a and 5b, that is, in the center in the depth direction as the container 1 by welding or the like, have one thin plate as the length. In a cross section orthogonal to the vertical direction, it is bent into a substantially J shape. At the time of this bending, as shown in FIG. 3, two J-shaped bent portions R1 and R2 are each provided with an R shape by bending for electric field relaxation. In this example, it is about R10 mm.
[0018]
The two bent portions R1 and R2 are formed so as to extend in parallel with the side walls 5a and 5b to be attached. By forming such a parallel extending portion 21, the rigidity of the reinforcing members 2a and 2b and the container side walls 5a and 5b can be further increased.
In addition, a sufficient gap should be provided between the substantially J-shaped tip edge 22 and the opposite side walls 5a and 5b so that welding work to the side walls 5a and 5b of the reinforcing members 2a and 2b can be easily performed. Good.
[0019]
According to this form 1, the reinforcing members 2a and 2b formed in a substantially J-shape are in a state in which the side edge on the upper end side of the J-shape is in vertical contact with the inner surfaces of the side walls 5a and 5b. It is welded with. Accordingly, the welding operation is a simple welding operation because it is only necessary to weld the contact portion of the plate abutted in a T-shape against the surface.
Further, in the first embodiment, unlike the substantially U-shaped reinforcing member 13 shown in FIG. 10 described as the prior art, it is not necessary to perform the welding work while paying attention so as to maintain airtightness, and it is simply strong. It only needs to be welded so as to be fixed to the side walls 5a and 5b, and it is not always necessary to continue the welded portion, and it is also possible to weld only necessary points. Therefore, it is possible to easily perform the welding operation without requiring an advanced welding technique as compared with the welding of the reinforcing member 13.
[0020]
Further, in the first embodiment, as shown in FIG. 2, the depth of the container 1 is increased in order to increase the internal volume of the container 1 and facilitate insulation design of various devices (not shown) installed in the container 1. The portions near both ends (flanges 3 and 4) of both side walls 5a and 5b, which are joined to the flange 3 and the flange 4 located at both ends in the direction, are arranged in such a manner that the broken line is in the vertical direction. The folded folds 51, 51 are formed, and the distance between the opposite side walls 5a, 5b is set to the distance (width) between the side walls 5a, 5b at least in the central regions 52, 52 in the longitudinal direction of the side walls 5a, 5b. ) Is widened.
[0021]
By providing such folds 51, 51 on the side walls 5a, 5b themselves, it is possible to increase the strength of the side walls 5a, 5b themselves, and in combination with the reinforcing members 2a, 2b, The pressure intensity can be further increased.
Further, in this case, as shown in FIG. 2, the reinforcing members 2a and 2b are respectively connected to intermediate portions between the flange 3 and the flange 4, that is, the side walls 5a and 5b in the central regions 52 and 52 in the longitudinal direction of the side walls 5a and 5b. It is effective when provided on the inner surface. .
[0022]
Embodiment 2. FIG.
In the second embodiment, the bent shape in the cross section in the first embodiment is formed in a substantially T shape instead of a substantially J shape. Hereinafter, this will be described with reference to FIG. FIG. 4 is a partially enlarged view showing the reinforcing member 6 of the second embodiment.
The reinforcing member 6 shown in FIG. 4 is formed by bending one thin plate so that its cross section is T-shaped. Therefore, two thin plates overlap each other on the left or right side of the T-shape for folding.
[0023]
On the left and right ends of the T-shape, R shapes for electric field relaxation are formed as R1 and R2, respectively. In this example, R1 and R2 are also about R10 mm, for example.
The two bent portions R1 and R2 are formed so as to extend in parallel with the side walls 5a and 5b to be attached. By forming such a parallel extending portion 61, the rigidity of the reinforcing member 6 and the container side walls (5a) and 5b can be further increased.
In addition, a sufficient interval is provided between the substantially T-shaped leading end edges 62 and 62 and the side walls (5a) and 5b facing each other so that welding work to the side walls (5a) and 5b of the reinforcing member 6 can be easily performed. It is good to have it.
The reinforcing member 6 formed in this manner is welded to the side wall (5a) 5b at the leg, that is, the side edge on the lower end side of the T-shape.
[0024]
According to this form 2, the reinforcing member 6 formed in a substantially T-shape is in a state where the side edge on the lower end side of the T-shape is in contact with the inner surfaces of the side walls (5a) and 5b in the vertical direction. It is welded with. Accordingly, the welding operation is a simple welding operation because it is only necessary to weld the contact portion of the plate abutted in a T-shape against the surface.
Also, in this second embodiment, unlike the substantially U-shaped reinforcing member 13 shown in FIG. 10 described as the prior art, there is no need to perform welding work while paying attention so as to maintain airtightness. It only needs to be welded so as to be fixed to the side walls (5a) and 5b, and it is not always necessary to continue the welded portion, and only necessary points can be welded. Therefore, it is possible to easily perform the welding operation without requiring an advanced welding technique as compared with the welding of the reinforcing member 13.
[0025]
If the reinforcing members 2a and 2b having the J-shaped cross section shown in FIG. 3 of the first embodiment and the reinforcing member 6 having the T-shaped cross section shown in the second embodiment have the same dimensions, The reinforcing member 6 shown in the form 2 can increase the bending rigidity in the Y-axis rotation direction in FIG. 5 showing a perspective view of the substantially J-shaped reinforcing members (2a) and 2b.
[0026]
The reinforcing members 2a, 2b, 5a, 5b, 6 used in the first and second embodiments are all edges (corner portions) of the reinforcing members 2a, 2b, 5a, 5b, 6 in order to relax the electric field. For example, the reinforcing members 2a, 2b, 5a, 5b, and 6 themselves are similarly bent by an appropriate bending process so that the bending rigidity of the transverse section is equal to or higher than that of the conventional reinforcing structure. Can be configured in the form.
Moreover, it is good to comprise in the form which also has the shielding effect like the T-shaped reinforcement member 6 of the said form 2.
In addition, since these reinforcing members 2a, 2b, 5a, 5b, and 6 have shapes that can form plate-like members by a simple bending process, mass production is easy.
[0027]
【The invention's effect】
According to the present invention, the reinforcing member of the gas insulated switchgear dexterity container by bending a plate-shaped member, to form a R shape for electric field relaxation, the one side edge of the plate-like member as the reinforcing member, the container sidewall Because it is configured to be in contact with the required part, it can be easily attached to the side wall of the container, and there is no need for a shield part as a separate member, making it possible to produce a container with high rigidity by simple bending. Therefore, it is possible to provide a gas insulated switch container that is easy to manufacture and can be mass-produced at low cost and has high pressure resistance.
[0028]
According to the present invention, the internal capacity of the container can be increased compared to the conventional case, and the strength of the container side wall can be further increased by the synergistic effect with the reinforcing member.
[Brief description of the drawings]
FIG. 1 is a perspective view of a gas insulated switchgear container (with a flange side wall removed) according to a first embodiment;
FIG. 2 is an end view taken along line AA in FIG.
3 is a partially enlarged view of a reinforcing member according to Embodiment 1. FIG.
4 is a partially enlarged view of a reinforcing member according to Embodiment 2. FIG.
FIG. 5 is a perspective view of a substantially J-shaped reinforcing member.
FIG. 6 is a perspective view of a conventional gas insulated switchgear container (with the side wall on the flange side removed).
7 is an end view taken along the line BB in FIG. 6. FIG.
FIG. 8 is an enlarged plan view of a conventional reinforcing structure.
FIG. 9 is an enlarged plan view of another conventional reinforcing structure.
FIG. 10 is an enlarged plan view of still another conventional reinforcing structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Container (gas insulation switchgear container), 2a, 2b, 6 Reinforcement member, 3, 4 Flange, 5a, 5b Side wall, 21, 61 Parallel extension part, 22, 62 Tip edge, 51 Fold, 52 Central area , R1, R2 R shape.

Claims (4)

A plate-shaped reinforcing member having a bent portion for electric field relaxation formed by bending in an R shape in cross section and having only a base end portion attached to the inner surface of the container side wall ;
The container for gas insulated switchgear, wherein the container side wall to which the reinforcing member is attached is formed so as to protrude outward so that the internal volume of the container increases . The reinforcing member is substantially J-shaped in cross section , and is formed to extend straight from the base end portion in a direction away from the inner surface of the container side wall, and the bent portion is directed so that the distal end portion faces the inner surface of the container side wall. The container for gas insulated switchgear according to claim 1, wherein a portion is provided . The reinforcing member is substantially T-shaped in cross section , and has a trunk portion extending straight from the base end portion in a direction away from the inner surface of the container side wall, and a pair of branches provided at the distal end portion of the trunk portion The container for gas insulated switchgear according to claim 1 , wherein the bent portion is provided in each of the branch portions . The container for gas insulated switchgear according to any one of claims 1 to 3, wherein the reinforcing member is formed by bending at least one plate-like member.

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