JP2014176276A - Sealed container for switch gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that, in a sealed container used for a switch gear, a process may be complicated and a price becomes high since marking-off for positioning board is required when joining a front board and a back board hermetically to a tubular side board by welding, and the price may also be made high by the need to attach a reinforcing member to the side board for immunity to a vacuum or pressurized state since it is necessary to perform a leakage test on the completed sealed container.SOLUTION: By providing a folded part on a side board of a sealed container, the folded part becomes a reinforcing member after the container is completed, thereby eliminating the need of a reinforcing member of a separate component. Furthermore, by providing unevenness at positions to be joined to the side board, the front board and the back board, respectively, the boards can be easily aligned.

Description

  The present invention relates to a hermetically sealed container used for a switchgear or the like in which an electrical device such as a circuit breaker or a disconnector is housed and an insulating medium such as gas is enclosed.

  Conventionally, a sealed container used for a switchgear or the like has been manufactured as follows. The side plate of the sealed container is formed into a cylindrical shape having a substantially mouth-shaped cross-section by bending a steel plate. And the joint of the steel plate formed in the cylinder shape is airtightly joined by welding. Another steel plate, such as a front plate and a back plate, was hermetically joined to the openings at both ends of the side plate formed in a cylindrical shape by welding.

  Since the airtight container manufactured by the above-described process is filled with an insulating medium such as gas, it is necessary to confirm whether the airtight container is free from leakage by a leak test. The leak test is performed with the inside of the sealed container in a vacuum state or a pressurized state. Therefore, the reinforcing member is attached to the sealed container so that the sealed container itself is not distorted even if the inside of the sealed container is in a vacuum or pressurized state.

JP 2011-193590 A

  When other steel plates such as a front plate and a back plate are joined to the side plate of the sealed container by welding, the front plate and the back plate are marked to accurately determine their positions. And after determining the position of each board, it joined by welding. Therefore, there is a problem that it takes time to adjust the position of the front plate and the back plate during welding.

  Further, after determining the position, it is necessary to fix the plates so as not to be displaced by a jig or the like. As described above, many steps are required to manufacture a sealed container, and it takes time to manufacture the container and the price is high.

  In addition, closed containers that have been joined by welding need to be equipped with reinforcing members on the side plates so that they can withstand the vacuum and pressurization conditions of the leak test. There was a problem of becoming higher.

  The present invention relates to a side plate formed by bending a plurality of steel plates, and a switchgear sealed container in which a front plate and a rear plate are joined to the side plate by welding, and a bent portion is provided at an end of the side plate. Provided with unevenness at positions where the side plate, the front plate and the back plate are joined.

  By providing the bent portion for reinforcement at the joint portion of the side plate of the closed container, the bent portion can be used instead of the reinforcing member, so that it is not necessary to provide the reinforcing member on the side plate.

  In addition, since unevenness is provided at the position where the side plate, front plate, and back plate are joined, positioning is easy by matching the unevenness during welding, and there is no need to fix with a jig, greatly reducing work processes. Can be achieved.

FIG. 1 is a cross-sectional view of a sealed container according to an embodiment of the present invention as seen from the front. FIG. 2 is a side view of the sealed container according to the embodiment of the present invention. FIG. 3 is a partial cross-sectional view of the sealed container according to the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of the sealed container as seen from the front, and FIG. 2 is a side view of the sealed container. The sealed container 1 is manufactured by combining a side plate 2, a front plate 3, and a back plate 4 and welding each joint.

  In the illustrated example, two side plates 2 having the same shape are combined. The side plate 2 is formed by bending a steel plate, and an end portion of the steel plate is provided with a bent portion 5 that is bent outward. It arrange | positions so that the bending part 5 of the two side plates 2 may be piled up, and the front-end | tip of the bending part 5 is joined by welding.

  The side plate 2 joined by welding has a cylindrical shape with a substantially mouth-shaped cross section. Further, a portion corresponding to the corner portion of the substantially mouth-shaped cylindrical shape is provided with an inclined portion in order to relieve pressure. The side plate 2 formed in a cylindrical shape has openings at both ends, and the front plate 3 and the back plate 4 are joined to the openings by welding.

  In the illustrated example, two side plates having the same shape are combined and configured, but the number of side plates is appropriately changed according to the shape of the sealed container and the usage situation.

  A fitting portion 6 is provided at a joint portion between the front plate 3 and the back plate 4 and the side plate 2. The fitting part 6 is demonstrated using FIG. The side plate 2 is provided with a convex projection 7, and the front plate 3 and the back plate 4 are provided with fitting holes 8.

  The protrusions 7 of the side plate 2 and the fitting holes 8 of the front plate 3 and the back plate 4 are set so that their positions and sizes match each other. By setting in this way, the side plate 2, the front plate 3, and the back plate 4 can be easily positioned simply by fitting the protrusion 7 and the fitting hole 8.

  As described above, in a state where the side plate 2, the front plate 3, and the back plate 4 are fitted together by the protrusion 7 and the fitting hole 8, the respective joint portions are joined in an airtight manner by welding.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Side plate 3 Front plate 4 Back plate 5 Bending part 6 Fitting part 7 Protruding part 8 Fitting hole

Claims (1)

  A side plate configured by bending a plurality of steel plates, and a switchgear sealed container in which a front plate and a back plate are joined to the side plate by welding, and a bent portion is provided at an end of the side plate, An airtight container for switchgear, characterized in that unevenness is provided at positions where the face plate, the front plate and the back plate are respectively joined.

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