JP2018078131A - Stationary induction equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide stationary induction equipment in which adhesion is maintained and a cover can be attached by eliminating an upper flange part of a tank and crushing packing with the tank end face and the cover.SOLUTION: Stationary induction equipment includes a tank 5 that accommodates a core-coil assembly, a cover 7 that covers the upper side of the tank, packing 6 provided between the end face of the tank and the cover, and a cover holding metal fitting 9. The tank has a structure without a flange at the top, and the packing covers the end face of the tank, and the cover holding metal fitting presses the cover against the end face of the tank to seal the end face of the tank.SELECTED DRAWING: Figure 2A

Description

  The present invention relates to a cover (lid) mounting structure that covers a tank of a stationary induction device such as a transformer or a reactor.

  For example, in an oil-filled transformer, an iron core-coil assembly (main body) is placed in a tank, immersed in insulating oil, and covered with a cover so that the insulating oil does not come into contact with outside air. A packing is attached to the cover, and a load is applied from the outside to crush the packing, and sealing is performed without a gap between the flange of the tank and the cover, thereby preventing oxidation of insulating oil and mixing of moisture. In addition to the oil-filled transformer, the transformer needs to have a sealed structure in order to protect the main body.

  As a mounting structure of the cover of the oil-filled transformer, there is Patent Document 1. The mounting structure described in Patent Document 1 is shown in FIG. An upper flange 2 is provided in the tank 1, the packing 4 is sandwiched between the cover 3 and the upper flange 2, and the cover 3 is attached by tightening with bolts and nuts.

  Further, in Patent Document 2, an annular seal packing is sandwiched between the annular flange portion of the case main body and the lid member, and an engaging portion provided on the seal packing is engaged with an edge portion of the flange portion, A sealed container (refer to the summary) is described in which a double seal is formed by a plurality of protrusions of a seal packing attached to a flange portion.

Japanese Patent Laid-Open No. 2006-18909 Japanese Patent Laid-Open No. 11-121245

  In the oil-filled transformer described in Patent Document 1, by providing the tank with a flange, a sufficient contact area with the cover is ensured, and stable installation becomes possible. However, when a flange is provided, space and materials for the flange are required, and thus there are problems such as an increase in size, weight, and cost of the transformer.

  Further, Patent Document 2 describes a sealed container in which a flange portion is formed by bending an end portion of a case main body. However, in a circular or polygonal tank, a flange portion is formed by bending an end portion of a case main body. It is difficult to form.

  An object of the present invention is to provide a stationary induction device that eliminates the upper flange portion of the tank, maintains the adhesion by crushing the packing between the tank end surface and the cover, and allows the cover to be attached.

  In order to solve the above-mentioned problems, a typical stationary induction device of the present invention is a device in which a gasket is attached to an end surface of a tank without using a flange at the upper part of the tank, and a cover is pressed by a cover holding metal fitting and sealed. is there.

  As an example of the “stationary induction device” of the present invention, a tank that houses an iron core-coil assembly, a cover that covers the upper side of the tank, and a packing that is disposed between the end surface of the tank and the cover. And a cover holding bracket, the tank has a structure having no flange at the top, the packing covers the end surface of the tank, and the cover pressing bracket presses the cover against the end surface of the tank. It is a static induction device that seals.

  According to the present invention, it is possible to employ a tank having a flangeless structure by disposing packing on the end face of the tank and providing the cover holding metal fitting on the tank. As a result, it is possible to reduce the man-hours and materials of the stationary induction device in size and manufacturing.

The schematic perspective view of an example of the oil-filled transformer of this invention. The figure which shows the cover attachment structure of Example 1 of this invention. The figure which shows a mode that it tightened and crushed packing in the cover attachment structure of FIG. 2A. The figure which shows the cover attachment structure of Example 2 of this invention. The figure which shows a mode that it tightened and squeezed packing in the cover attachment structure of FIG. 3A. The figure which shows the cover attachment structure of Example 3 of this invention. The figure which shows the cover attachment structure of Example 4 of this invention. The figure which shows a mode that it tightened and squeezed packing in the cover attachment structure of FIG. 5A. The figure which shows the cover attachment structure of Example 5 of this invention. The figure which shows the conventional cover mounting structure.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings for explaining the embodiments, the same components are denoted by the same names and symbols, and the repeated explanation thereof is omitted.

  The transformer of Example 1 of this invention is demonstrated using FIGS. 1-2B.

  FIG. 1 is a schematic perspective view showing an oil-filled transformer according to a first embodiment of the present invention. The oil-filled transformer 101 has a tank 103. The tank 103 contains an iron core-coil assembly (main body), is filled with insulating oil, and is covered with a cover (lid) 102. And the attachment part 104 of Example 1 of this invention presses the several places of the cover 102 on the upper part of the side part of the tank 103, and seals the inside of a tank.

  FIG. 2A shows the cover mounting structure of the first embodiment. The transformer has a flangeless tank structure without an upper flange, and the end of the tank 5 faces upward. A U-shaped packing 6 is attached to the end surface of the tank 5 so as to surround the end portion. A cover (lid) 7 is disposed above the U-shaped packing 6 so as to cover the tank 5. The cover 7 is attached by arranging a cover presser bracket mounting seat 8 connected to the tank 5 by welding or the like, and a cover presser bracket 9 for pressing the cover 7 toward the U-shaped packing 6. Press to press and tighten. FIG. 2B shows a state in which the cover 7 is pressed by the cover pressing metal 9 and the U-shaped packing 6 is pressed. The U-shaped packing 6 is deformed and comes into close contact with the cover 7 in a wide range, whereby the tank 5 and the cover 7 are sealed.

  By making the U-shaped packing 6 into a ring shape, it is possible to maintain good airtightness without causing a gap in the connection portion. Even when it is not in a ring shape, it is possible to keep the airtightness by filling the gap between the connecting portions with a sealing material. In addition, when applied to a multi-faceted tank shape, by using a U-shaped packing 6 that matches the outer shape of the tank instead of a simple ring-shaped U-shaped packing 6, stress unevenness at the corners can be eliminated and loosened. Can be installed without. The material of the U-shaped packing 6 is different in performance required for the U-shaped packing 6 depending on the transformer specifications, but generally requires oil resistance, heat resistance, and mechanical strength, so nitrile rubber Urethane rubber and fluororubber are suitable.

  According to the present embodiment, the cover 7 can be attached without any problem in airtightness without providing a flange on the upper portion of the tank 5. And since it is not necessary to provide a flange in the upper part of a tank, the miniaturization of a transformer, the man-hour reduction at the time of manufacture, material reduction are attained, and cost can be reduced. In addition, since there is no flange, a circular or polygonal tank can be manufactured at low cost, and various types of static induction devices can be provided.

  A transformer according to a second embodiment of the present invention will be described with reference to FIGS. 3A and 3B.

  FIG. 3A shows a cover mounting portion of a transformer in which a cover 11 having a recess is arranged in the flangeless tank 5 of the present embodiment. A U-shaped packing 6 is attached to the end surface of the tank 5 so as to surround the end portion. The structure of attaching the cover 11 using the cover presser fitting mounting seat 8 connected to the tank 5, the cover presser fitting 9 holding the cover 11, and the bolt 10 is the same as in the first embodiment.

  The cover 11 of this embodiment includes a recess 12 at a contact portion with the U-shaped packing 6, and the U-shaped packing 6 is fitted into the recess 12. FIG. 3B shows a state where the cover 11 is pressed by the cover pressing metal 9 and the U-shaped packing 6 is pressed. The U-shaped packing 6 is deformed, and the tank 5 and the cover 11 are hermetically sealed by closely contacting the cover 11 within the recess 12.

  According to the present embodiment, the pressure applied to the U-shaped packing 6 can be dispersed as compared with the case where there is no recess 12, so that the U-shaped packing 6 can be prevented from being damaged or broken. Further, since the contact area between the U-shaped packing 6 and the cover 11 is increased, the adhesion of the U-shaped packing 6 is improved, and a more stable airtightness can be maintained. Furthermore, when the U-shaped packing 6 is fitted into the recess 12, the cover 11 can be easily aligned with the tank 5.

  The transformer of Example 3 of this invention is demonstrated using FIG.

  FIG. 4 shows the cover mounting portion of the transformer of this embodiment. The end face of the flangeless tank 15 is curled by rounding the end of the tank 15 outward. A packing 14 is provided so as to cover the curling portion 13. A curling portion 13 covered with a packing 14 is disposed in the recess 12 of the cover 11. The structure for attaching the cover 11 using the cover pressing bracket mounting seat 8 connected to the tank 15 subjected to curling, the cover pressing bracket 9 for pressing the cover 11, and the bolt 10 is the same as in the first embodiment.

  The flangeless tank 15 of this embodiment has a curling process on its end surface, and a packing 14 that covers the curling portion 13 is attached. And by making the packing contact part of the cover 11 into the concave structure 12, compared with the structure of Example 2, the pressure added to the packing 14 can be disperse | distributed more and a contact area can be expanded. Thereby, adhesiveness is further improved and it becomes possible to maintain more stable airtightness.

  The transformer of Example 4 of this invention is demonstrated using FIG. 5A and 5B.

  FIG. 5A shows a cover attaching portion of a transformer in which a U-shaped packing 6 is attached to the end face of the flangeless tank 5 of this embodiment and a guide 17 is provided on the cover 16. The structure of attaching the cover 16 using the cover presser fitting mounting seat 8 connected to the tank 5, the cover presser fitting 9 holding the cover 16, and the bolt 10 is the same as in the first embodiment.

  In the cover 16 of this embodiment, the outer end of the cover 16 is bent downward, that is, toward the tank 5. A guide 17 is provided inside the U-shaped packing 6 along the U-shaped packing 6. FIG. 5B shows a state where the cover 16 is pressed by the cover pressing metal 9 and the U-shaped packing 6 is pressed. Although the U-shaped packing 6 is deformed by pressurization, the pressure applied to the U-shaped packing 6 is dispersed and the contact area with the cover 16 is expanded by supporting the side surface of the crushed U-shaped packing 6 with the guide 17. can do. Thereby, adhesiveness is further improved and it becomes possible to maintain more stable airtightness.

  The transformer of Example 5 of this invention is demonstrated using FIG.

  FIG. 6 shows a cover mounting portion of a transformer in which a plate packing 18 having a recess 19 is attached to the cover 7 of the present embodiment, and the end face of the flangeless tank 5 is arranged in the recess 19 of the plate packing 18. Yes. The structure for attaching the cover 16 using the cover retainer mounting base 8 connected to the tank 5, the cover retainer 9 for retaining the cover 7, and the bolt 10 is the same as in the first embodiment.

  According to the present embodiment, it is possible to improve the adhesion with the flangeless tank end surface by providing the plate-like packing 18 with the recess 19. Further, the plate packing 18 and the cover 7 can be easily positioned with respect to the end surface of the tank 5.

  In each embodiment, an oil-filled transformer has been described as an example, but the present invention can also be applied to a transformer that does not use insulating oil. Moreover, not only a transformer but this invention can be used for static induction devices, such as a reactor, in general.

1 Tank 2 Upper flange 3 Cover (lid)
4 Packing 5 Tank 6 U-shaped packing 7 Tank cover (lid)
8 Cover pressing bracket mounting seat 9 Cover pressing bracket 10 Bolt 11 Cover 12 with concave portion 12 Recess 13 Curling portion 14 Packing 15 covering the curling portion Tank 16 with curling processing 17 Guide with cover 17 Guide 18 Plate-shaped packing 19 with concave portion Sealing recess 101 Oil-filled transformer 102 Cover (lid)
103 Tank 104 Cover mounting part

Claims (14)

A tank containing the core-coil assembly;
A cover covering the upper side of the tank;
A packing disposed between an end face of the tank and the cover;
Cover holding metal fittings
The tank has a structure having no flange at the top, the packing covers an end surface of the tank, and the cover pressing metal presses the cover against the end surface of the tank and seals it. The static induction device according to claim 1,
The stationary induction device in which the packing is a U-shaped packing, and the U-shaped packing is attached to an end surface of the tank. The static induction device according to claim 1,
The said cover is a stationary induction | guidance | derivation apparatus provided with the recessed part in which the packing attached to the end surface of the said tank fits. The static induction device according to claim 1,
A stationary induction device in which an end surface of the tank is curled by curling outward, and the packing covers a curling portion. The stationary induction device according to claim 4,
The said cover is a stationary induction | guidance | derivation apparatus provided with the recessed part in which the packing which covers the said curling part fits. The static induction device according to claim 1,
The said cover is a stationary induction | guidance | derivation apparatus provided with the guide which contacts when the packing is pressurized along the packing attached to the end surface of the said tank. The static induction device according to claim 1,
The said packing is a plate-shaped packing affixed on the said cover, The said plate-shaped packing is a stationary induction | guidance | derivation apparatus provided with the recessed part into which the end surface of the said tank fits. In the static induction device according to any one of claims 1 to 7,
A stationary induction device in which insulating oil is accommodated in the tank. In the static induction device according to any one of claims 1 to 7,
The static induction device is a static induction device which is a transformer or a reactor. A stationary induction device having a tank containing insulating oil and a cover covering the tank,
The tank has an end surface facing the cover and a side surface portion of the opposing end surface, and the side surface portion has a plurality of cover presser fitting mounting seats protruding to the outer peripheral side,
A packing that covers an end surface facing the cover and a part of the side surface portion is disposed,
A stationary guide device in which a cover presser fitting attached to the cover presser fitting mounting seat presses the upper part of the cover. The stationary induction device according to claim 10,
A stationary guidance device, wherein the cover is provided with a recess at a position corresponding to an end surface facing the cover. The stationary induction device according to claim 11, wherein
The packing is a stationary induction device that is a U-shaped packing. The stationary induction device according to claim 11, wherein
The stationary guide device in which the end surface of the cover is curled by curling outward. The stationary induction device according to claim 10,
The said cover is a stationary induction | guidance | derivation apparatus provided with the guide which contacts when the packing is pressurized along the packing arrange | positioned at the said tank.

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