JPH0447942Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a protective housing, and more particularly to a protective housing for accommodating a drive mechanism of an on-load tap changer.

[Prior art] Generally, in a load tap switching device, the fifth
Drive mechanism and protective housing 2 as shown
0 is attached to the outside of the transformer tank 30. In the conventional protective housing, as shown in FIGS. 3 and 4, a mounting seat 12 for fixing a drive mechanism (not shown) is welded to the inside of the casing 11, and is further attached to the transformer tank on the outside of the casing 11. A mounting plate 13 and a reinforcing member 14 are welded to each other.

The casing 11 is made of a thin sheet metal material to reduce weight, and the mounting seat 12 has a seat surface 12a for attaching the drive mechanism and a screw portion 12b for fixing the drive mechanism, and is made by stud welding or the like. be done. The mounting plate 13 needs strength because it attaches the casing 11 to the transformer tank side plate, and is made of a thick sheet metal material and is welded to the outside of the casing 11 and almost to the back side of the mounting seat 12.

[Problem that the invention attempts to solve]

Conventional protective housings are constructed as described above, so the heat generated when welding the mounting seat causes distortion in the case made of thin plate, causing the mounting seat to tilt, etc., making it difficult to mount the drive mechanism properly. It is difficult to obtain the dimensional accuracy of the mounting seat necessary for operation, and there is a problem in that the mounting position of the mounting seat needs to be corrected.

This invention was made to solve the above problems, and the purpose is to provide a protective housing that has a mounting seat with high dimensional accuracy and is not affected by distortion due to heat during welding. There is.

[Means for solving problems]

The protective housing according to this invention is manufactured by providing an opening at the location where the mounting seat is provided in the casing, closing the opening with a base plate from the outside of the casing, and attaching the mounting seat directly to the base plate by welding.

[Effect]

First, a base plate for attaching the casing to a transformer tank, etc. is made from a thick material, and the base plate is welded to the casing so as to close the opening of the casing so as to maintain airtightness of the casing. do. A pedestal to be housed inside the casing, for example, for mounting a drive mechanism, is fixed to the base plate from inside the casing by welding. Since the base plate is thick, the dimensional accuracy of the mounting seat that has already been installed will not be disrupted by the heat generated during welding.

〔Example〕

An embodiment of the protective housing according to this invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing one embodiment of this invention, and FIG. 2 is a sectional view of the first embodiment. A housing 1 made of a thin material has an opening 5 at a location where a mounting seat 2 is to be provided. Furthermore, the opening 5 is connected to the housing 1.
It is closed by the base plate 3, which is thicker than the outside. In addition, the mounting seat 2 for fixing the drive mechanism etc. housed in the protective housing is welded to the base plate 3.
It is set in. This protective housing is used by being attached to the outer wall 30 of a transformer tank, such as an on-load tap changer, as shown in FIG. 5, as in the prior art.

Since the base plate 3 is thick, even if the mounting seat 2 is welded, the distortion due to heat is extremely small and the dimensional accuracy of the mounting seat 2 that has already been attached will not be disturbed. Moreover, if the housing 1 and the base plate 3 are sealed by watertight welding, the function as a protective housing will not be lost.

〔effect〕

As described above, according to this invention, the deviation in dimensional accuracy of the mounting seat caused by heat during welding of the mounting seat is extremely small, and there is no need to correct errors in dimensional accuracy due to distortion, which was necessary in the conventional case. Therefore, it is possible to provide a protective housing that is inexpensive and has a mounting seat with high dimensional accuracy.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the protective housing according to this invention, Fig. 2 is a sectional view of the protective housing shown in Fig. 1, Fig. 3 is a perspective view showing a conventional protective housing, and Fig. 4 5 is a sectional view of a conventional protective housing, and FIG. 5 is a schematic diagram showing how the protective housing is generally used. In the figure, 1 is a housing, 2 is a mounting seat, 3 is a base plate, and 5 is an opening.

Claims (1)

[Claims for Utility Model Registration] A protective housing having a casing that houses a drive mechanism therein and a base plate on which a mounting seat for fixing the drive mechanism is provided, wherein a portion of the casing where the mounting seat is provided. Protection characterized in that the base plate has an opening, the base plate is attached from the outside of the casing so as to close the opening, and the mounting seat is welded to the base plate from the inside of the casing. housing.