JPH0225219Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an oil-tight container for accommodating, for example, a switching switch of an on-load tap changer.

Various oil-tight containers of this type have been proposed in the past for the purpose of improving oil-tight reliability and easing processing accuracy. 1 and 2 show a conventional oil-tight container. In the figure, numeral 1 denotes a tube body laminated in a joined state in the radial direction, and has a plurality of engaging grooves 1a divided in the center line direction and having a flat surface formed at the bottom. 2 is a cap fitted to the end of the tubular body 1; 3 is an elastic ring inserted between the end of the tubular body 1 and the bottom surface of the cap 2; and 4, the inner protruding surface 4a of the cap fits into each engagement groove 1a. A pair of semicircular arc-shaped engagement pieces are fitted into the cap, 5 is a fastener consisting of a bolt that connects each engagement piece 4 and the cap 2, and 6 is a bolt that connects each engagement piece 4.

As described above, the elastic ring 3 inserted between the end surface of the tube body 1 and the bottom surface of the cap 2 is inserted into the engagement groove 1a.
Fastener 5 connects the engaging piece 4 fitted to the cap 2 with the cap 2.
Since the cap 2 and the tube body 1 are tightened by joining them together, the permissible machining error in the diameter dimensions of the cap 2 and the tube body 1 can be made large, which not only makes machining the cap 2 and the tube body 1 easier. By limiting the number of oil-tight locations to one location, the reliability of oil-tightness can be improved.

However, in such a conventional system, since the engaging piece has the above-described shape, the following drawbacks occur.

(1) Machining is difficult because it has a protruding surface on the inside of the semicircular arc.

(2) When connecting two engaging pieces, the flat surface of the engaging groove of the tube and the inner protruding surface of the engaging piece are connected because the bolt 6 is tightened, so the thin wall of the tube By applying concentrated shearing force to the tube, there is a high possibility that the tube body will be destroyed. Further, it is difficult in processing to uniformly join the entire outer circumference of the tube including the flat surface of the engagement groove of the tube to the entire inner surface including the inner protruding surface of the engagement piece. In other words,
An appropriate means is to provide a slight gap between the inner projecting surface of the engaging piece and the flat surface of the engaging groove of the tube body, and to perform the joining at the outer periphery of the engaging groove of the tube body, excluding the flat surface. It is. However, this may cause slippage in the circumferential direction between the cap including the engagement piece and the tube, which may cause a shift in the positional relationship between the upper and lower sides of the oil-tight container (not shown).
Therefore, it is necessary to tighten the engaging piece more firmly against the tube body, but in this case, the inner protrusion surface of the engaging piece must be precisely machined in relation to the engaging groove of the tube body. is an essential condition, and in addition, there must be a gap between the flat surface of the engaging groove of the tube body and the inner protruding surface of the engaging piece even when tightened. is required.

(3) The engaging piece needs to have a wall thickness greater than that of the bolt for connection, which increases the weight and
Requires machining such as spot facing and tapping for bolts.

The present invention was developed in view of the above points, and it is an oil-tight container that does not impair the oil-tight effect of the conventional method, has good processability and workability, and further improves economic efficiency by reducing weight. This is what we are trying to provide.

This will be explained below using figures. In FIGS. 3 and 4, 7 has one end surface 7a in the circumferential direction of the tube body 1.
This is a rectangular engaging piece 7 that comes into contact with the flat bottom surface of the engaging groove 1a formed at 90° intervals, and this engaging piece 7 is fixed to the cap 2 by a fastener 5. This engaging piece 7 is connected to the tube body 1 and the cap 2 by a fastener 5 screwed in the axial direction of the tube body 1.
There is an oil-tight connection between the two and the ring 3. In addition,
Other numerals are the same as or corresponding to those in the prior art described above, and their explanations will be omitted.

In an oil-tight container configured as above,
The following effects can be expected.

(1) By providing a plurality of rectangular engagement pieces independently in each engagement groove of the tube body, there is no gap between one end surface of the engagement piece and the bottom surface of the engagement groove of the tube body. Furthermore, the engaging piece can be joined to the engaging groove without excessive shearing force being applied to the engaging groove, and the cap and tube body connected to this engaging piece are free from misalignment in the circumferential direction. There is no need to worry, and the upper and lower positions of the oil-tight container are maintained.

(2) The engaging piece has a constant rectangular shape,
Workability is greatly improved.

(3) The conventional type required a wall thickness greater than the thickness of the bolt to connect the divided engagement pieces, but
The engaging piece is independently fixed to the cap, so that the thickness of the engaging piece can be reduced and the weight can be reduced.

(4) Since each engaging piece independently engages with each engaging groove of the tube body and is fixed to the cap, work efficiency during assembly is improved.

(5) Each engagement piece is fixed to the cap by a plurality of fasteners that are screwed at regular intervals in the axial direction and circumferential direction of the tube, so there is no tension between the cap and the tube. Oil-tight performance is demonstrated evenly.

Since the other components are unchanged from the conventional system, it goes without saying that the advantages of the conventional system as an oil-tight container are exhibited.

[Brief explanation of drawings]

Fig. 1 is a plan view of a conventional oil-tight container, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a plan view of an oil-tight container showing an embodiment of this invention, and Fig. 4 is a plan view of a conventional oil-tight container. FIG. 4 is a sectional view taken along the - line in FIG. 3; In the figure, 1 is a tube body, 1a is an engagement groove, 2 is a cap, 3 is an elastic ring, 5 is a fastener, and 7 is an engagement piece. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A tube body having a plurality of joining grooves with a flat bottom surface formed by cutting tangentially at regular intervals in the circumferential direction on the outer periphery of the laminated cylindrical body, and a tube body that is fitted into one end of the tube body. A cap having a U-shaped cross section, an elastic ring provided between the cap and the end surface of the tubular body, and a rectangular shape attached to the cap with one end surface in contact with the bottom surface of each of the engagement grooves. each engaging piece has both ends attached to the cap in the axial direction of the tubular body with a fastener, thereby allowing the ring to pass between the tubular body and the cap. An oil-tight container made of oil-tight water.