JPS5818265Y2 - Tank for oil-filled appliances - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tank for an oil-filled electrical appliance, and particularly relates to an improvement in a vibration-proof tank.

Oil-filled electric appliances, such as transformers, are mounted on cargo handling machines during transportation, or vibration acceleration is applied from the transformer mounting base during earthquakes.

When vibration acceleration having a vibration frequency band close to the natural frequency of the system including the transformer mounting part is transmitted to the transformer, a resonance phenomenon occurs, and the acceleration response magnification of the upper part of the transformer with respect to the input acceleration of the lower part is several times This vibration causes a stress proportional to the magnitude of the excitation moment in the transformer base, and if the number of repetitions is large, a relatively small vibration stress can lead to fatigue failure and damage the tank. occurs.

In general, a tank that stores the contents of a transformer has a long side plate 1, a short side plate 2, a bottom plate 3, a horizontal reinforcing beam 4 provided around the side of the tank, and a frame for attaching a cover, as shown in Figures 1 and 2. It consists of a top band 5 and a base 6 attached to the bottom plate 3, and the transformer is fixed to a foundation (not shown) with bolts or the like through holes 7 provided in the base 6.

When an excitation force is applied to this transformer, the stress distribution for the X-direction excitation near the joint with the bottom plate becomes stress 8a shown in Figure 3, and the stress distribution for the Y-direction excitation becomes stress 8b shown in Figure 4.
Therefore, the maximum stress is σX.

It becomes σy.

These maximum stresses σX and σy are proportional to the magnitude of the excitation moment generated in the transformer, and the width and length of the base 6, which is provided perpendicularly to the long side plate 1 and is welded and fixed to the bottom plate 3, is proportional to the magnitude of the excitation moment generated in the transformer. This occurs in approximately inverse proportion to the thickness of the side plate 1.

Therefore, even if the acceleration entering the transformer is small, its frequency may resonate with the natural frequency of the system including the transformer mounting part, or when the number of repetitions is large, or when the input acceleration to the transformer is large and the excitation moment is When the stress is large, the maximum stress generated in the side plate must be limited to the allowable stress underground.

Furthermore, in order to prevent damage to the tank, the thickness of the side and bottom plates must be increased, which increases material costs, and there are other problems that need to be improved, such as an increase in the weight of the tank.

The present invention was developed in consideration of the above points, and its purpose is to provide a lightweight tank for oil-filled appliances with high mechanical strength that can significantly reduce the stress at the bottom of the tank caused by vibration. It's about doing.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An oil-filled Ti tank according to an embodiment of the present invention will be described below with reference to the drawings.

The same parts as in FIGS. 1 to 4 are given the same reference numerals.

As shown in FIGS. 5 and 6, the tank of an oil-filled electrical device, for example, a transformer, has a lower opening surrounded by long sides 1 parallel to each other and short sides 2 parallel to each other. The bottom plate 3 is fixed and formed so as to be perpendicular to each other.

In addition, a horizontal reinforcing beam 4 is fixed to the side of the tank along the horizontal direction, and a top band 5 is used to attach a cover to the periphery of the upper opening surrounded by the long side plate 1 and the short side plate 2.
Install.

Furthermore, a pair of bases 6 made of, for example, U-shaped steel are attached to the bottom plate 3 so as to be substantially orthogonal to the long side plate 1 near each side where the bottom plate 3 and the short side plate 2 are fixed, and on the long side plate 1 side. The ends of the base 6 are made to protrude and are fixed.

One side of the U-shaped steel of the protrusion 6a of the base 6 is fixed to the bottom plate 3, and a fixing hole 7 is provided in the other side of the protrusion 6a.
and fixing hole 7 in the base embedded in the foundation (not shown).
The mounting is secured by means of mounting bolts (not shown).

Alternatively, it is mounted and fixed on a transport vehicle during transportation or cargo handling.

A pair of bases 6 made of U-shaped steel are fixed to the bottom plate 3 with their opening sides facing each other, and the bottoms of their protruding portions 6a face the short side plates 2, respectively.

The vertical reinforcing beam 9 is made of, for example, U-shaped steel, with the opening side of the vertical reinforcing beam 9 facing the protrusion 6a side, and one side of the vertical reinforcing beam 9 touching the long side plate 1, so that it is close to the bottom plate 3. It is fixed by welding so as to reach the horizontal reinforcing beam 4.

In addition, the opposite side of the portion of the vertical reinforcing beam 9 fixed to the protruding portion 6a is bent to form a cutout, and the portion of the vertical reinforcing beam 9 that contacts the bottom plate 3 is formed with a notch as a so-called edge cut. The above-mentioned welded valve part of the vertical reinforcing beam 9 and the welded part of the bottom plate 3 are formed separately.

As described above, this tank is fixed to a substrate (not shown) embedded in the foundation by a fixing bolt (not shown) inserted through the fixing hole 7 provided in the protrusion 6a of the base 6, or during transportation or cargo handling. Fixed to the transport vehicle.

However, the excitation moment caused by the vibration of the transformer generates a reaction force on the fixing bolt.

The stress distribution of the long side plate 1 near the joint with the bottom plate 3 caused by the X-direction vibration is stress 10a shown in FIG. 7, and the maximum stress is stress σ The stress is 10b as shown in the figure, and the maximum stress is σy', and the stress is 8a, 8b, and the maximum stress σX'+σy, respectively.
' indicates the conventional case described above.

As for those that oppose the excitation moment of the transformer mentioned above, the side plate stress σ11 Force transmission area Ais Distance between reaction force application points l
The sum of the multiplicative products of i, ie, Σσ1Aili.

Therefore, the above-mentioned reaction force is distributed and transmitted to the long side plate 1 in response to vibration in the X or Y direction, and the longitudinal reinforcing beam 9 is fixed so that the side plate stress σI is reduced in the width direction (X
Direction) Increase the area to increase the force transmission area Ai.

In addition, the area in the height direction is increased by arranging the upper part of the vertical reinforcing beam 9 to reach the horizontal reinforcing beam 4, and the area is further increased by transmitting force by connecting to the horizontal reinforcing beam 4 at the upper part. The horizontal reinforcing beams 4 are also formed to share the load.

On the other hand, regarding the distance Ai between the reaction force application points, the vertical reinforcing beam 9 is positioned outward from the base 6 in the X direction so that li is made large for excitation in the X direction, and the distance Ai is long for excitation in the Y direction. By arranging the vertical reinforcing beam 9 on the outside of the side plate in the Y direction, it is formed to increase llj.
The force transmission area Ai and the distance li between reaction force application points for Y-direction excitation can be easily increased several times or more compared to the vertical structure, and the maximum stresses σX' and σy' mentioned above can be increased by σX, σ
It can be significantly reduced to a fraction of that of y.

Other embodiments of the present invention are shown in FIGS. 9 to 11.

The same parts as in FIG. 5 are given the same symbols.

Each of the vertical reinforcing beams 11, 12, and 13 is provided outside the base 6 in the X direction, and is formed of a U-shaped, L-shaped, or flat plate-shaped reinforcing member that connects the long side plate 1 and the horizontal reinforcing beam 4.

By providing these longitudinal reinforcing beams, the above-mentioned longitudinal reinforcing beam 9
When the transformer is vibrated, the stress distribution near the joint with the bottom plate is as shown in Figures 7 and 8, with the maximum stresses σX' and σy' being higher than before. It can be significantly reduced.

As described above, according to the present invention, by providing a vertical reinforcing beam, even if vibration acceleration is applied to the transformer and a large vibration moment occurs, the stress in the side plate near the joint with the tank bottom can be significantly reduced compared to the vertical reinforcement beam. It is possible to provide a tank for an oil-filled electrical appliance that can significantly reduce material costs and tank weight by reducing the thickness of the side and bottom plates.

[Brief explanation of the drawing]

Figures 1 to 4 show conventional transformer tanks;
Figures 2 and 2 are front and side views, Figures 3 and 4 respectively.
The figures are stress distribution diagrams of the side plates due to excitation in the X and Y directions, respectively. Figures 5 and 6 are front and side views of the transformer tank of the present invention, respectively. Figures 7 and 8 are the illustrations of the present invention. A stress distribution diagram showing the stress distribution of the side plate of the transformer tank of the invention due to vibration in the X and Y directions, and FIGS. 9 to 11 are front views showing main parts of other embodiments of the invention, respectively. 1...Long side side plate, 2...Short side side plate, 3
...Bottom plate, 4...Horizontal reinforcement beam, 6...
...Base, 6a...Protrusion, 7...
・Fixing holes, 9, 11, 12, 13... Vertical reinforcement beam.

Claims (1)

[Scope of utility model registration request] A pair of long-side side plates facing each other in parallel, a pair of short-side side plates facing parallel to each other, a bottom plate fixed at right angles to the lower edges of these side plates, and the outer surfaces of these side plates laterally. In a tank consisting of a horizontal reinforcing beam fixed all around the circumference, a horizontal reinforcing beam extending perpendicularly to the long side plate and protruding outward from the bottom plate in the vicinity of each of both sides fixed to the short side side plate of the bottom plate. A pair of bases is provided, and a vertical reinforcing beam is provided in the longitudinal direction so as to connect the side surface of the protruding portion on the short side side plate side of the protruding portion of the base with the long side plate and the horizontal reinforcing beam above the protruding portion. A tank for oil-filled appliances that is characterized by being stuck.