JP2021061678A - Pressure vessel, and gas-insulated switch gear using the same - Google Patents

Abstract

To provide a pressure vessel capable of reducing a stress value of a stress concentration portion generated originated from a position to which a reinforcing member is welded, or a stress concentration portion generated originated from a rounded corner portion or a sharp corner portion of the pressure vessel, is reduced.SOLUTION: A pressure vessel is formed by joining a plurality of metal-plate wall bodies by welding. The pressure vessel is provided in a wall body with a reinforcing plate having a cut-out at a location including a part of periphery of a welded position in the wall body. The reinforcing plate having the cut-out is welded onto the wall body along an outer periphery of the reinforcing plate.SELECTED DRAWING: Figure 1

Description

The present application relates to a pressure vessel and a gas-insulated switchgear using the pressure vessel.

The pressure vessel is a vessel formed by joining the walls of a metal plate by welding. A device such as a circuit breaker is housed inside the pressure vessel in which the insulating gas is sealed, and a gas-insulated switchgear is formed together with the circuit breaker operating device and the like. The inside of the pressure vessel is generally adjusted to a pressure of about 0.03 to 0.6 MPa, and an environment excellent in insulation performance and arc extinguishing performance is maintained.

Increasing the gas pressure inside the pressure vessel increases the stress on the walls or welded parts of the pressure vessel. If the gas pressure becomes excessive, the pressure vessel may be destroyed at a place where a stress higher than the surroundings is locally generated (hereinafter referred to as a stress concentration part). Therefore, the pressure vessel is prevented from being destroyed at the stress concentration part. There was a problem.

In order to solve this problem, a reinforcing structure in which an inner surface or an outer surface of a wall body of a pressure vessel, or a plate member or a plate member having been bent on both sides is welded as a reinforcing member is disclosed. In recent years, the pressure vessel has become thinner, the space inside the gas-insulated switchgear has been reduced, and the outer shape of the pressure vessel has become more complicated due to the consolidation of switchgear equipment. The number of points increased and the welding time increased, and the work time for adding the reinforcing member increased. In addition to the wall body and welded part of the pressure vessel, stress concentration also occurs in the vicinity of the welded part of the reinforcing member and the R or corner part of the pressure vessel due to the increase in the number of reinforcing members and the complication of the outer shape. It became a part, and the stress concentration part was increasing. As a reinforcing structure that improves the working time for adding the reinforcing member, the reinforcing member provided on the inner surface of the wall body of the pressure vessel is welded and fixed from the outer surface using the slit-shaped mortise provided on the wall body. The configuration is disclosed (see, for example, Patent Document 1).

JP-A-2017-135762

In Patent Document 1, since the reinforcing member provided on the inner surface side is welded and fixed from the outer surface side, the work efficiency is not deteriorated. However, there is a strength measure against the stress concentration part caused by the welded part of the reinforcing member or the stress concentration part caused by the R part or the corner part of the pressure vessel caused by the complicated outer shape of the pressure vessel. There was a problem that it was necessary.

The present application has been made to solve the above-mentioned problems, and an object of the present application is to obtain a pressure vessel in which the stress value of the stress concentration portion generated around the welded portion in the wall body is reduced.

The pressure vessel disclosed in the present application is a pressure vessel formed by joining a wall body of a plurality of metal plates by welding, and has a notch at a position including a part around a welded portion in the wall body. A reinforcing plate to be provided is provided on the wall body.

According to the pressure vessel disclosed in the present application, the stress value of the stress concentration portion generated around the welded portion in the wall body can be reduced.

It is a perspective view which shows the appearance of the pressure vessel which concerns on Embodiment 1. FIG. It is a perspective view which attached the operation equipment mounting plate to the pressure vessel which concerns on Embodiment 1. FIG. It is sectional drawing which shows the schematic example of the gas insulation switchgear which concerns on Embodiment 1. FIG. It is a top view which shows the example of the reinforcing plate of the pressure vessel which concerns on Embodiment 1. FIG. It is a side view of a part of the pressure vessel which concerns on Embodiment 1. FIG. FIG. 5 is a cross-sectional view taken along the alternate long and short dash line AA of FIG. It is a figure which shows the welded part of the reinforcing plate of the pressure vessel which concerns on Embodiment 1. FIG. It is a perspective view which shows the appearance of the pressure vessel which concerns on Embodiment 2. FIG. It is a top view which shows the example of the reinforcing plate of the pressure vessel which concerns on Embodiment 2. FIG. It is a side view of a part of the pressure vessel which concerns on Embodiment 2. FIG. It is a side view of a part of another pressure vessel which concerns on Embodiment 2. FIG. It is a perspective view which shows the appearance of the pressure vessel which concerns on Embodiment 3. It is a top view which shows the example of the reinforcing plate of the pressure vessel which concerns on Embodiment 3. FIG. It is a front view of the pressure vessel which concerns on Embodiment 3. It is a side view of the pressure vessel which concerns on Embodiment 3. FIG. It is a rear view of the pressure vessel which concerns on Embodiment 3. FIG.

Hereinafter, the pressure vessel according to the embodiment of the present application and the gas-insulated switchgear using the pressure vessel will be described with reference to the drawings. In each figure, the same or corresponding members and parts will be described with the same reference numerals.

Embodiment 1.
FIG. 1 is a perspective view showing the appearance of the pressure vessel 1 according to the first embodiment, FIG. 2 is a perspective view in which an operating device mounting plate 11 is attached to the pressure vessel 1, and FIG. 3 is a perspective view showing the pressure vessel 1 according to the first embodiment. It is sectional drawing which shows the schematic example of the gas insulation switching apparatus 100 used. As shown in FIG. 3, the gas-insulated switchgear 100 includes a pressure vessel 1, a circuit breaker 30 housed inside the pressure vessel 1, a circuit breaker operating device 31 provided outside the pressure vessel 1, and pressure. It is a device including the container 1 and other devices connected to it. An insulating gas whose pressure has been adjusted is sealed in the pressure vessel 1, and an environment excellent in insulation performance and arc extinguishing performance is maintained inside the pressure vessel 1.

As shown in FIG. 1, the pressure vessel 1 is composed of a front surface portion 3, a ceiling portion 4, a back surface portion 5, a side surface portion 6, and a floor surface portion 7, and the front surface portion 3 is open. From this opening, a device such as a circuit breaker 30 is inserted into the pressure vessel 1 and installed. As shown in FIG. 2, this opening is closed by the operating device mounting plate 11 to which the circuit breaker operating device 31 (not shown in FIG. 2) is attached after the device such as the circuit breaker 30 is installed. The operating device mounting plate 11 is, for example, a thick plate having a thickness of about 12 to 20 mm and made of a metal such as iron or stainless steel, and the operating device mounting plate 11 serves as a substitute for reinforcing the front portion of the pressure vessel 1. , No reinforcing member is provided on the front surface. Each element constituting the pressure vessel 1 is a wall body 2, and the pressure vessel 1 is a container formed by joining a plurality of metal plate wall bodies 2 by welding. The wall body 2 will be described below with reference numerals only to one wall body 21 which is the ceiling portion 4 and the other wall body 22 which is the side surface portion 6. The wall body 2 is, for example, a plate having a plate thickness of about 3 to 9 mm and made of iron or stainless steel. The pressure vessel 1 is not a rectangular parallelepiped, and the back surface portion 5 is provided in a protruding shape in order to save space inside the gas-insulated switchgear 100, but the shape of the pressure vessel 1 is not limited to this shape.

The reinforcing structure of the pressure vessel 1 will be described. When the gas pressure inside the pressure vessel 1 becomes excessive, the stress applied to the wall body 2 of the pressure vessel 1 or the welded portion between the wall body 2 and the wall body 2 increases, and the stress is locally increased from the surroundings. There is a risk of failure at locations where high stress is generated (hereinafter referred to as stress concentration areas). Further, in recent years, the pressure vessel 1 has become thinner, the space inside the gas insulation switching device 100 has been reduced, and the outer shape of the pressure vessel 1 has become more complicated due to the consolidation of equipment of the switchboard. As the stress concentration part located around the formed part, the stress concentration part caused by the welded part of the reinforcing structure and the stress concentration part caused by the R part or the corner part of the pressure vessel 1 are included. It has increased. Therefore, a reinforcing structure is welded to each stress-concentrated portion, including the newly generated stress-concentrated portion, as a measure against strength. The pressure vessel 1 includes a reinforcing member 8 and a reinforcing plate 9 as a reinforcing structure. The reinforcing member 8 is a square columnar member having a cross-sectional shape of, for example, 16 mm × 16 mm, and is welded to the outer surface 2a of one of the plurality of wall bodies 2. In the present embodiment, an example in which the reinforcing member 8 is provided only on the outer surface 2a of one wall body 21 is shown, but the present invention is not limited to this, and different wall bodies 2 such as the back surface portion 5 and the side surface portion 6 are provided. The reinforcing member 8 may be arranged on the outer surface or the inner surface of the pressure vessel 1. Further, the size of the cross section of the reinforcing member 8 is not limited to this, and the size of the cross section may be further increased.

Next, the reinforcing plate 9 which is a main part of the present application will be described. FIG. 4 is a plan view showing an example of the reinforcing plate 9 provided on the side surface portion 6 of the pressure vessel 1 according to the first embodiment shown in FIG. 1, and FIG. 5 shows the pressure around the reinforcing plate 9 and the reinforcing plate 9. A side view of a part of the container 1, FIG. 6 is a cross-sectional view taken along the alternate long and short dash line AA of FIG. 5, and FIG. 7 is a view showing a welded portion 12 of the reinforcing plate 9 of the pressure vessel 1. The reinforcing plate 9 in the present embodiment is provided as a strength measure against the stress concentration portion 10 generated due to the portion where the reinforcing member 8 is welded. As shown in FIG. 4, the reinforcing plate 9 is a metal plate material such as iron provided with a notch portion 9a. The thickness of the reinforcing plate 9 is equal to or less than the plate thickness of the wall body 2. As shown in FIG. 5, the reinforcing plate 9 has a notch at a position including a part of the stress concentration portion 10 around the welded portion in the wall body 2. The shape and size of the notch portion 9a are changed by the stress value of the stress concentration portion 10 surrounded by the reinforcing plate 9 around the notch portion 9a. The stress value of the stress concentration portion 10 is confirmed by performing both analysis and actual measurement, and a notch portion 9a is provided so that the stress value is reduced. In the case of the present embodiment, the area ratio of the reinforcing plate 9 to the notch portion 9a is designed to be about 5: 2, and the stress value of the stress concentration portion 10 is reduced.

In the present embodiment, as shown in FIG. 5, the stress concentration portion 10 is adjacent to the reinforcing member 8 on the outer surface 2a of the other wall body 22 joined to one wall body 21 to which the reinforcing member 8 is attached. It is a place. The stress concentration portion 10 is a root of the reinforcing member 8, and is a stress concentration portion 10 generated due to a portion where the reinforcing member 8 is welded. The reinforcing plate 9 having a notch at a position including the stress concentration portion 10 is welded to the outer surface 2a of another wall body 22 along the outer circumference of the reinforcing plate 9. The broken line portion shown in FIG. 7 is the welded portion 12 which is the welded portion of the reinforcing plate 9. In the cross section of FIG. 6, the welded portion 12 is a welded portion 12a and a welded portion 12b shown by diagonal lines. The conventional plate-shaped reinforcing member has been used in a rectangular shape having no notched portion. The length of the joint portion between the rectangular reinforcing member and the pressure vessel (hereinafter referred to as welding distance A) was the distance of the outer circumference of the rectangle. The length of the joint portion between the reinforcing plate 9 and the pressure vessel 1 (hereinafter referred to as welding distance B) is shown in FIG. 6 because the reinforcing plate 9 is provided with a notch portion 9a as compared with the welding distance A. It is approximately twice as long as the area surrounded by the alternate long and short dash line. For example, when the welding distance A of the rectangular reinforcing member of 10 cm × 17 cm is 50 cm, the welding distance B is about 70 cm, so that the welding distance B is about 40% longer than the welding distance A. The fact that the welding distance B increases with respect to the welding distance A means that the joining distance between the reinforcing plate 9 and the pressure vessel 1 increases as compared with the conventional case. As a result, the strength of the stress concentration portion is improved as compared with the conventional case. Further, in the conventional rectangular reinforcing member, the central portion is not joined to the pressure vessel at all, but the reinforcing plate 9 is joined to the pressure vessel 1 including the central position of the conventional reinforcing plate. The strength of the stress concentration portion is improved.

As described above, the pressure vessel 1 is located around the welded portion of the wall body 2 at a position including a part of the stress concentration portion 10, which is a portion where a stress higher than the surrounding is locally generated. Since the reinforcing plate 9 having a notch is welded to the wall body 2 of the pressure vessel 1, the stress value of the stress concentration portion 10 is reduced and strength measures are taken without increasing the overall wall thickness of the pressure vessel 1. Can be applied. Further, since the reinforcing plate 9 is joined to the pressure vessel 1 including the central portion of the rectangular reinforcing member by cutting out the reinforcing plate 9, the strength of the stress concentration portion 10 is improved. be able to. Further, since the reinforcing plate 9 is welded to the wall body 2 of the pressure vessel 1 along the outer periphery of the reinforcing plate 9, the joining distance between the reinforcing plate 9 and the pressure vessel 1 increases, and the strength of the stress concentration portion 10 increases. Can be improved. Further, when the stress concentration portion 10 is adjacent to the reinforcing member 8 on the outer surface 2a of the other wall body 22 joined to the one wall body 21 to which the reinforcing member 8 is attached, the base of the reinforcing member 8 is stressed. Since the reinforcing plate 9 which is the concentrating portion 10 and has a notch at the position including the stress concentrating portion 10 generated due to the welded portion is welded to the wall body 2 of the pressure vessel 1, the stress concentrating portion 10. The stress value of 10 can be reduced. Further, since the gas-insulated switchgear 100 includes the reinforcing plate 9 in the pressure vessel 1 in which the circuit breaker 30 is housed, the strength of the pressure vessel 1 with respect to the stress concentration portion 10 can be improved.

It is possible to increase the welding distance by increasing the number of reinforcing plates and welding the outer circumference of each reinforcing plate, but due to the increase in the number of reinforcing plates, the position at the time of welding between each reinforcing plate and the pressure vessel. Welding time will increase. Further, as the number of reinforcing plates increases, the size of each reinforcing plate becomes smaller, so that the influence of strain generated during welding becomes larger, and the correction time of welding strain increases. If the reinforcing plate 9 is provided with the notch 9a, the welding distance can be lengthened as an integral body without dividing the reinforcing plate and increasing the number of reinforcing plates. Therefore, the time for aligning the reinforcing plates and welding The strain correction time can be shortened and the work can be performed efficiently.

In the above, the reinforcing plate 9 provided on the front side surface portion 6 has been described in FIG. 1, but the arrangement of the reinforcing plate 9 is not limited to this, and the reinforcing plate 9 faces the side surface portion 6, and the inner surface 2b is shown in FIG. A reinforcing plate 9 may also be attached to the base of the reinforcing member 8 on the side surface portion. Further, when the reinforcing member 8 is provided on the outer surface of the wall body such as the back surface portion 5 and the side surface portion 6, the reinforcing plate 9 may be attached to the base of the additionally provided reinforcing member 8. Further, although an example in which the reinforcing plate 9 is welded and attached to the side surface portion 6 has been shown, the attachment method of the reinforcing plate 9 is not limited to this, and may be attached by brazing.

Embodiment 2.
The pressure vessel 1 according to the second embodiment will be described. FIG. 8 is a perspective view showing the appearance of the pressure vessel 1, FIG. 9 is a plan view showing an example of the reinforcing plate 13 of the pressure vessel 1, and FIG. 10 is one of the pressure vessel 1 showing the reinforcing plate 13 and the periphery of the reinforcing plate 13. It is a side view of a part. The pressure vessel 1 according to the second embodiment has a structure in which a reinforcing plate 13 is provided in addition to the structure of the first embodiment.

The reinforcing plate 13 is provided as a strength measure against the stress concentration portion 10a generated by the R portion 1a of the pressure vessel 1. As shown in FIG. 9, the reinforcing plate 13 is a metal plate material such as iron provided with a notch portion 13a. The thickness of the reinforcing plate 13 is equal to or less than the plate thickness of the wall body 2.

In the present embodiment, as shown in FIG. 10, the stress concentration portion 10a is a portion adjacent to the R portion 1a formed on the peripheral edge portion of the pressure vessel 1. The reinforcing plate 13 having a notch at a position including the stress concentration portion 10a is welded to the side surface portion 6 made of the wall body 2 along the outer circumference of the reinforcing plate 13. Compared with the welding distance A between the rectangular and plate-shaped reinforcing member and the pressure vessel, the welding distance B between the reinforcing plate 13 and the pressure vessel 1 is a welding distance because the reinforcing plate 13 is provided with a notch 13a. B is longer. The fact that the welding distance B increases with respect to the welding distance A means that the joining distance between the reinforcing plate 13 and the pressure vessel 1 increases as compared with the conventional case. As a result, the strength of the stress concentration portion is improved as compared with the conventional case. Further, with the rectangular reinforcing member, it is not possible to take a strength measure against the stress concentration portion 10a caused by the R portion 1a of the pressure vessel 1 with one reinforcing member, and it is necessary to use a plurality of rectangular reinforcing members. It was. However, since the reinforcing plate 13 is provided with the notch portion 13a, it is possible to take strength measures against the stress concentration portion 10a with only one reinforcing plate 13.

FIG. 11 is a side view of a part of the reinforcing plate 131 and another pressure vessel 1 showing the periphery of the reinforcing plate 131 according to the second embodiment. In the above, the reinforcing plate 13 is provided as a strength measure against the stress concentration portion 10a caused by the R portion 1a of the pressure vessel 1, but it is caused by the corner portion 1b formed on the peripheral portion of the pressure vessel 1. Another reinforcing plate 131 may be provided as a strength measure against the stress concentration portion 10b. The reinforcing plate 131 having a notch at a position including the stress concentration portion 10b is welded to the side surface portion 6 formed of the wall body 2 along the outer circumference of the reinforcing plate 131. In the reinforcing plate 131 as well, the joining distance between the reinforcing plate 131 and the pressure vessel 1 is increased as compared with the joining distance of the conventional reinforcing member, as in the case of joining the reinforcing plate 13. Further, it is possible to take strength measures against the stress concentration portion 10b with only one reinforcing plate 131 without joining a plurality of reinforcing plates.

As described above, since the pressure vessel 1 is provided with the notch portions 13a in the reinforcing plates 13 and 131, the strength measures of the stress concentration portions 10a and 10b are taken only by one reinforcing plate 13 and 131, respectively. Therefore, the mounting work of the reinforcing plates 13 and 131 can be efficiently performed. Further, when the stress concentration portions 10a and 10b are formed on the peripheral portion of the pressure vessel 1 and adjacent to the R portion 1a or the corner portion 1b, the stress concentration portion generated by the R portion 1a or the corner portion 1b. Since the reinforcing plates 13 and 131 having notches at positions including the 10a and 10b are welded to the wall body 2 of the pressure vessel 1, the stress values of the stress concentration portions 10a and 10b can be reduced and strength measures can be taken. it can.

In the above, the reinforcing plate 13 provided on the front side surface portion 6 in FIG. 8 and the reinforcing plate 131 shown in FIG. 11 have been described, but the arrangement of the reinforcing plates 13 and 131 is not limited to this, and the side surface portion is not limited to this. Reinforcing plates 13 and 131 may be attached to the side surface portions facing the sixth surface and showing the inner surface 2b in FIG. Further, the reinforcing plates 13 and 131 may be further attached to a portion adjacent to another R portion (for example, R portion 1c) or another corner portion (for example, corner portion 1d) formed on the peripheral edge portion of the pressure vessel 1. ..

Embodiment 3.
The pressure vessel 1 according to the third embodiment will be described. 12 is a perspective view showing the appearance of the pressure vessel 1, FIG. 13 is a plan view showing an example of the reinforcing plate 14 of the pressure vessel 1, FIG. 14 is a front view of the pressure vessel 1, and FIG. 15 is a side view of the pressure vessel 1. FIG. 16 is a rear view of the pressure vessel 1. The pressure vessel 1 according to the third embodiment has a rectangular parallelepiped shape and is provided with a reinforcing plate 14 having a shape different from that of the other embodiments.

As shown in FIG. 12, the pressure vessel 1 is composed of a front surface portion 3, a ceiling portion 4, a back surface portion 5, a side surface portion 6, and a floor surface portion 7, and the front surface portion 3 is open. Each element constituting the pressure vessel 1 is a wall body 2, and the pressure vessel 1 is a container formed by joining a plurality of metal plate wall bodies 2 by welding.

The pressure vessel 1 includes a reinforcing member 8 and a reinforcing plate 14 as a reinforcing structure. The reinforcing member 8 is a square columnar member having a cross-sectional shape of, for example, 16 mm × 16 mm, and is made of iron or stainless steel. As shown in FIG. 14, the reinforcing member 8 is welded to the center of the inner surface 2b of the back surface portion 5, which is one of the plurality of wall bodies 2. The reinforcing member 8 is a reinforcing structure used for connecting equipment (not shown) installed inside the pressure vessel 1. In FIGS. 15 and 16, the outer shape of the reinforcing member 8 is shown by a broken line.

The reinforcing plate 14 is provided as a strength measure against the stress concentration portion 10c generated due to the portion where the reinforcing member 8 is welded. As shown in FIG. 13, the reinforcing plate 14 is a metal plate material having a rectangular outer shape and having a rectangular opening 14a in the center, such as iron. The thickness of the reinforcing plate 14 is equal to or less than the plate thickness of the wall body 2.

In the present embodiment, as shown in FIG. 16, the stress concentration portion 10c is an outer surface portion of the back surface portion 5 which is one wall body to which the reinforcing member 8 is attached, which is adjacent to the reinforcing member 8. The stress concentration portion 10c is a root of the reinforcing member 8 and is a stress concentration portion generated due to a portion where the reinforcing member 8 is welded. The reinforcing plate 14 having an opening at a position including the stress concentration portion 10c is welded to the back surface portion 5 made of a wall body along the outer circumference and the inner circumference of the reinforcing plate 14. Compared with the welding distance A between the rectangular and plate-shaped reinforcing member and the pressure vessel, the welding distance B between the reinforcing plate 14 and the pressure vessel 1 is the welding distance B because the reinforcing plate 14 is provided with the opening 14a. Is longer. The fact that the welding distance B increases with respect to the welding distance A means that the joining distance between the reinforcing plate 14 and the pressure vessel 1 increases as compared with the conventional case. As a result, the strength of the stress concentration portion is improved as compared with the conventional case. Further, in the rectangular reinforcing member that is not opened, the central portion is not joined to the pressure vessel at all, but the reinforcing plate 14 includes the portion that was the central portion of the reinforcing plate that is not opened. Since it is joined to, the strength of the stress concentration portion is improved.

As described above, when the outer surface portion of the back surface portion 5 which is one wall body to which the reinforcing member 8 is attached is the stress concentration portion 10c at the portion adjacent to the reinforcing member 8, the root of the reinforcing member 8 is stress-concentrated. The reinforcing plate 14 is welded to the wall body of the pressure vessel 1 along the outer and inner circumferences of the reinforcing plate 14 which is the portion 10c and has an opening at a position including the stress concentration portion 10c generated due to the welded portion. Therefore, the stress value of the stress concentration portion 10c can be reduced and strength measures can be taken. Further, since the reinforcing plate 14 is attached to the outer surface, the reinforcing plate 14 can be easily aligned and the attaching work can be performed efficiently.

In the above, the shape of the opening 14a is provided in a rectangular shape, but the shape of the opening 14a is not limited to this, and any shape having an opening at a position including the stress concentration portion 10c is, for example, a pentagon or a hexagon. It may be a polygon such as a rectangle.

The present application also describes various exemplary embodiments and examples, although the various features, embodiments, and functions described in one or more embodiments are those of a particular embodiment. It is not limited to application, but can be applied to embodiments alone or in various combinations.
Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

1 Pressure vessel, 1a R part, 1b corner part, 1c R part, 1d corner part, 2 wall body, 2a outer surface, 2b inner surface, 3 front part, 4 ceiling part, 5 back part, 6 side part, 7 floor part, 8 Reinforcing member, 9 Reinforcing plate, 9a Notch, 10 Stress concentration part, 11 Operation equipment mounting plate, 12 Welding part, 13 Reinforcing plate, 13a Notch, 131 Reinforcing plate, 14 Reinforcing plate, 14a Opening, 21 One wall, 22 other walls, 30 circuit breakers, 31 circuit breaker operating equipment, 100 gas-insulated switchgear

Claims (8)

A pressure vessel formed by welding the walls of a plurality of metal plates.
A pressure vessel characterized in that the wall body is provided with a reinforcing plate having a notch at a position including a part around a welded portion of the wall body. A pressure vessel formed by welding the walls of a plurality of metal plates.
A pressure vessel characterized in that the wall body is provided with a reinforcing plate having an opening at a position including a part around a welded portion of the wall body. The pressure vessel according to claim 1, wherein the reinforcing plate having a notch is welded to the wall body along the outer periphery of the reinforcing plate. The pressure vessel according to claim 2, wherein the reinforcing plate having an opening is welded to the wall body along the outer circumference and the inner circumference of the reinforcing plate. A reinforcing member welded to the outer surface of one of the plurality of wall bodies is provided.
3. A third aspect of the present invention, wherein the reinforcing plate having a notch at a position including a portion adjacent to the reinforcing member on the outer surface of the other wall body joined to the one wall body is welded. The pressure vessel described. A reinforcing member welded to the inner surface of one of the plurality of wall bodies is provided.
The pressure vessel according to claim 4, wherein the reinforcing plate is welded and has an opening at a position including an outer surface portion of a portion of the one wall body adjacent to the reinforcing member. The pressure vessel according to claim 3, wherein the reinforcing plate is welded, which has a notch at a position including an R portion formed on the peripheral edge portion of the pressure vessel or a portion adjacent to a corner portion. The pressure vessel according to any one of claims 1 to 7.
A gas-insulated switchgear comprising a circuit breaker housed inside the pressure vessel.

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