JPS58363Y2 - Bellows type oil tank - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bellows-type oil tank, particularly a bellows-type oil tank for an oil-filled insulated capeple.

As shown in Fig. 1, a conventional bellows-type oil supply tank has a bellows-type cylindrical body 1 that can be expanded and contracted, the lower end of which is joined to a main plate 3 by means such as welding, and a plurality of guides fixed to the upper surface of the lower plate. An upper plate body 2 in which guide holes 5 are loosely fitted to the rods 4 is joined and sealed to the upper end of the bellows-shaped cylindrical body 1 by welding or the like.

The lower plate body 3 communicates with an oil-filled insulated capeple via a communication pipe (not shown), and the bellows-shaped cylinder body 1 is filled with oil 6.

The amount of oil 6 in the cable of the bellows type cylinder 1 is determined by the upper plate 2.
This can be determined by the height H up to.

Note that the guide rod 4 is fixed at its upper end by a fixing plate 12.

In the above conventional structure, as shown in FIG. 3, there is a gap between the guide hole 5 of the upper plate 2 and the guide rod 4 due to manufacturing and assembly reasons, and the upper plate 2 is guided by the guide rod 4. A gap is required to move up and down.

However, due to this gap, there is a possibility that the upper plate body 2 may be tilted with respect to the horizontal plane due to the expansion and contraction characteristics of the bellows-shaped cylinder body 1 or due to external vibrations.

This inclination causes a large error in the above-mentioned oil amount indication.

The height H of the bellows-shaped cylindrical body 1 in this case of inclination is such that the larger the diameter of the upper plate 2, the greater the difference in the circumferential direction of the upper plate 2. The pitch P of the body 1 varies in the vertical direction or the circumferential direction, which becomes a factor that shortens the life of the bellows-shaped cylinder 1.

Further, even when vibration occurs due to an earthquake or the like, there is a drawback that the upper plate 2 may vibrate and the vibration of the bellows-shaped cylindrical body 1 itself may be exacerbated.

The purpose of this invention is to provide a bellows-type oil tank that eliminates the above-mentioned drawbacks, prevents the upper plate from tilting, eliminates the cause of errors in oil quantity indication, and allows stable operation over a long period of time. It's about doing.

In the present invention, the length of the continuous or discontinuous fitting portion of the upper plate with respect to the guide rod in the fitting direction is partially larger than the thickness of the plate.

An embodiment of the bellows type oil supply tank of the present invention will be described below with reference to FIG. 4, using the same reference numerals for the same parts as in the prior art.

In the upper plate body 2, at each guide rod 4 fitting position, a sub guide plate 7 having a sub guide plate fitting hole 8 into which the guide rod 4 can be fitted loosely is placed at a distance of h on the upper and lower sides respectively. Fixed.

Therefore, the upper plate body 2 is guided by the lower sub-guide plate fitting hole 8, the guide hole 5, and the -L side sub-guide plate fitting hole 8.

The distance of the sub-guide plate 7 from the upper plate body 2 is not particularly limited as long as it does not interfere with the expansion and contraction of the bellows-shaped cylinder body 1, but as the height increases, the weight increases. It is selected in comparison with the characteristics of the bellows-shaped cylindrical body 1.

The inclination angle α with respect to the horizontal plane when the upper plate body 2 touches the guide rod 4 is α=tan-1 in the case of FIG.
It becomes J-.

t is the difference between the outer diameter of the guide hole 5 of the upper plate 2 and the guide cutout 4.

Therefore, it is very difficult to reduce tl in terms of manufacturing, assembly, and operation.

Therefore, it is necessary to increase the thickness of the upper plate 2.

However, when the thickness of the upper plate body 2 itself is increased, since the upper plate body 2 is made of a metal material, the more the plate production increases and the total weight of the upper plate body 2 becomes heavier, the more the bellows-shaped cylindrical body 1 The difference in pitch between each sheet becomes large, which is inappropriate.

For this reason, the auxiliary guide plate 7 of this embodiment as shown in FIG. 4 is provided, and in this case, the angle of inclination becomes α='0 round, which is extremely small.

Although the sub-guide plates 7 are provided on both the upper and lower surfaces of the upper plate body 2, only one of them may be provided.

In this way, the length in the fitting direction of the part of the upper plate 2 that is fitted to the guide rod 4 is made discontinuous with the upper plate 2 at the fitting part, and is made larger than the thickness of the upper plate 2. It is possible to reduce the inclination of the plate 2 and smoothly move it up and down without increasing the total weight of the upper plate 2 portion.

FIG. 5 shows another embodiment, in which the hollow threaded rod 9A of the guide guide cylinder 9 is inserted from above into the guide hole 5 of the upper plate 2, and the hollow threaded rod is inserted into the lower surface of the upper plate 2. A nut 10 is screwed and fixed to the threaded portion of the hollow threaded rod 9A, and the guide rod 4 is loosely fitted into the guide cylinder fitting hole 11 in the hollow portion of the hollow threaded rod 9A.

The inclination angle α in this case is α-tan- as in the above embodiment.
1 unit t+-h, and the inclination angle α can be made small as in the above embodiment.

FIG. 6 shows still another embodiment, in which a cylinder 13 having a guide hole 5 is fixedly formed on the upper plate 2.
The guide rod 4 is fitted to increase the length in the fitting direction and the inclination angle α is
It is a smaller version and has similar effects.

It should be noted that lightweight and strong materials are preferable for the above-mentioned sub-guide plate, guide cylinder, etc., and relatively thin steel plates, aluminum plates, Bakelite plates, etc. are suitable, and plastic materials are suitable for the guide cylinder. preferable.

As described above, the bellows type oil tank of the present invention has a simple structure such as attaching a sub-guide plate or a guide cylinder to the upper plate, and prevents the upper plate from tilting, which can cause errors in oil level indication. This has the effect of eliminating this problem and stabilizing the operation over the long term.

Furthermore, since the occurrence of inclination is eliminated, wear and tear on the bellows can be reduced, and vibrations can also be reduced.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional bellows type oil tank, Fig. 2 is a plan view of the upper plate shown in Fig. 1, and Fig. 3 is an enlarged sectional view of section A in Fig. 1 when the upper plate is tilted. FIG. 4 is a sectional view of the vicinity of the upper plate attachment part showing an embodiment of the bellows type oil tank of the present invention;
FIG. 5 is a detailed view of the guide rod and upper plate engagement portion of another embodiment of the bellows type oil tank of the present invention, and FIG. 6 is a detailed view of the fifth embodiment of the bellows type oil tank of the present invention. It is a sectional view of the same part as the figure. In the figure, 1 is a bellows-shaped cylinder, 2 is an upper plate, 3 is a lower plate, 4 is a guide rod, and 5 is a guide hole.

Claims (1)

[Scope of utility model registration request] a bellows-shaped cylindrical body that communicates with the inside of the oil-filled insulated cable and is expandable and retractable in the vertical direction; a lower cylindrical body that is joined to the lower end of the bellows-shaped cylindrical body and has a plurality of guide rods protruding from its upper surface; and the bellows-shaped cylindrical body In a bellows type oil supply tank consisting of an upper plate body having a guide hole joined to the upper end and guided by the guide rod, the length in the fitting direction of the connection or continuous fitting portion of the upper plate body to the guide rod is determined. A bellows type oil supply tank characterized in that the thickness is larger than the thickness of the plate body.