JPS59117103A - Tank for oil-immersed electric apparatus - Google Patents

Abstract

PURPOSE:To make an electric machine smaller and lighter by a method wherein corrugated radiation plates are provided to four corners of a tank and a large heat radiation area is obtained. CONSTITUTION:An oil path 27, which is surrounded at three sides by a pillar 16 at each corner of a tank and is covered at both sides by an extension 20b of a corrugated radiation plate 20 and a side part 25 of a corrugated radiation plate 21, is formed and through the oil path 27 the oil in the tank flows, as shown by arrow marks, into fin-shape projected parts 22, which is formed on the extension 20b of the radiation plate 20, and into a gap between a side part 24 of the radiation plate 20 and the pillar 16. With this constitution, a heat radiation area is increased by the area of the extension 20 without increasing the external dimensions of a conventional tank so that the dead spaces at the corners of the conventional tank can be fully utilized as the heat radiation area.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in a tank for oil-filled electrical equipment whose body portion is constructed using a corrugated heat sink with high cooling effect, which is made by continuously bending and forming a thin steel plate.

FIG. 1 is a front view of a conventional oil-immersed transformer using this type of tank, FIG. 2 is a cross-sectional view of the tank body, and FIG. 3 is an enlarged sectional view of the corner of the tank. The tank 1 shown in these figures has an upper frame 5 provided with a flange for attaching a tank cover 4 and a tank bottom plate; the upper and lower ends are welded between each side of the lower frame 6. The body is constructed by stretching a corrugated heat sink 2 having a large number of closed fin-like protrusions 3, and each corner 7 of the body is formed by bending the corrugated heat sink 2 at right angles or by bending the corrugated heat sink 2 at a right angle. It is constructed by joining the end of the plate 2 by end metal welding.

Tanks using this type of corrugated heat sink are mainly used in medium and small oil-filled transformers, and are against the trend of making transformers smaller and lighter. However, when applied to larger capacity transformers, etc.
For the reasons described below, there are restrictions on the height and number of fin-like protruding parts of the corrugated heat dissipation plate, and the small eaves are light.

In other words, this type of tank is designed to be completely sealed with insulating oil for cooling and insulating the R-air equipment body, and depending on the application, a space f for pressure adjustment is provided and sealed 1, f! &
When the tank is in use, dynamic pressure is generated in the tank body due to the static pressure and temperature rise due to the head of the insulating oil and the volumetric expansion Lτ of the internal air.

Figure 3 shows a state in which the corrugated heat dissipation plate extends into the previous tank due to the internal pressure of the pipes 1 and 2. A chain line 'C is shown. If you straddle this V node, the two adjacent sides will be facing each other (141)
In the summer part 3a of H, f and fl appear symmetrically with respect to the entire center of point A, and the change (the amount of Fs is relatively small. However,
The abdomen 3b of the fin-like overhang 3 located near the corner 7 facing the corner 7 is deformed as f, which is larger than fl. For example, plate thickness t = 1.2-, height of overhang (wave height) h = 315, width of overhang (wave 1) b = 1
0.4X+, distance between overhangs (pits) l, = 37.5 degrees, distance from corner 7 to the nearest overhang 1. = 5Qm, when an internal pressure of 0.1 kg/c- is applied to a corrugated heat dissipating sheet metal lA tank with an overhang length of 1g-1524m in the vertical direction, fl = io order, J'', = 20 degrees. A strange J was observed.

The deformation of this fin-like overhang increases as the internal pressure increases, and eventually exceeds the elastic limit of the material and causes permanent deformation. Therefore, such a fu.

Amount of deformation to -: different tank structures! .

The allowable internal pressure, etc. must be determined based on the value of .

In this way, the amount of deformation of the fin-like overhang 3 near the corner is
The reason why r,>t can be explained as follows. As shown in FIG. 4, when an internal pressure of P per fluorescent area is applied to each part of the corrugated heat sink 2, if the abdomens 3a and 3b of the fin-like extensions 3 are VC, then M=p-a (a: pressure-receiving area) The force of is applied. Considering the moment tra around the center point A of the force M acting on the opposing abdomens 3a of adjacent fin-like extrusions 3, the moment of the force acting on these opposing abdomens 3aK is A force is applied to 3a in a direction that reduces force M. Therefore, the amount of deformation f1 caused by the opposing abdomens 3aK is symmetrical and relatively small, but the corner 7
Abdomen 31) K facing the corner 7 side of the fin-like overhang 3 close to
Since there is no force acting from the abdomens 3a facing each other as described above, and the force opposing M is only the force N applied to the pressure receiving surface of the corrugated heat sink from the abdomen 3b to the corner 7, M>N. It is thought that the result is fj)f. This tendency becomes more pronounced as the ratio between the height h and the width of the overhang increases. Distance from corner 7 to the nearest overhang! , to be as thick as the height h of the overhang (then l, medium fl becomes φ;
For this purpose, it is necessary to reduce the number of projecting parts 3 and sacrifice the heat dissipation area.

In this way, when using conventional oil-filled electrical equipment tanks using corrugated heat sinks, there are restrictions on the height and number of fin-like protruding parts of the corrugated heat sinks, so the amount of heat generated is smaller than the size of the contents. Due to the large losses, in large equipment (for example, an oil-immersed self-cooling transformer with a capacity of 750 KVA or more), the length of the fin-shaped overhang is 1. Overall length (and if necessary for cooling, it is necessary to increase the approximate dimensions X and y of the tank shown in Figure 2 to increase the installation space for the corrugated heat sink, resulting in an increase in tank dimensions and weight. This makes economical design difficult.

As a countermeasure to this problem, the inventors installed joint plates 8 having the same shape and size as the fin-like protrusions 3 of the corrugated heat sink 2 at each corner of the tank body, as shown in FIG. are arranged symmetrically with respect to the two sides of
I previously proposed joining with 0b (@ Gansho 54-21
No. 797).

According to this configuration, when internal pressure is applied to the tank, the interaction between the forces applied to the fin-like protruding portions 3 of the corrugated heat sink 2 and the opposing abdomens of the joint plate 8 causes the twisted fin-like shape shown in FIG. It is possible to eliminate the unbalance in the deformation amounts r, , c, of the extrusion part and create a tank structure that is harmonious in terms of strength, and also has the effect of increasing the heat radiation area because the joint plate 8 acts as a heat radiation plate. However, it was not sufficient in terms of effective use of dead space in the corners of the tank.

The present invention has been made in view of the above points, and an object of the present invention is to provide a tank for oil-filled electrical equipment that can achieve a strong VC balance, has no dead space, and can be made smaller and lighter.

Embodiments of the present invention shown in FIGS. 6 to 12 will be described below.

Tank 1 according to the invention, as shown in detail in FIG.
The 10 framework consists of an upper frame 12, a lower case (wood 13, support 16).
It consists of a body and a base member 17.

The upper frame 2 is made by combining L-shaped members into a frame shape consisting of long sides and short sides to form seven langes 18 that serve as mounting seats for the tank cover. The extended upper joint plate portion 14≠; is shaped like F&J by the extension of the long side 1iiQ L llt portion.

The lower frame body 13 is formed into a frame shape consisting of long sides and short sides by fully bending a steel plate, etc., and a tank bottom plate 19 is integrally attached thereto. This lower frame 13H is placed on a base member 17 made by combining U-shaped steel. It has a notch 29 with a curved line 27 on the short side.

The pillar 16 with a cross section L7 ratio has its long side connected to the upper and lower frames 12.
It is located parallel to the short side of the base member 13 and is joined by welding, and its lower end is fixed by welding to the top of the base member 17. The cross-sectional shape of the support column 16 is not limited to an L-shape, but may be any shape having two side surfaces 2 that are overlapped and joined to side portions 24.25 of a corrugated heat sink 20.21, which will be described later.

Corrugated heat sinks 20.
21 to form the tank body.

Wave 7 heat sink 20, 21i size M steel plate? Each plate has a fin-like protruding part 22, 23 formed by bending it into a wave shape, closing the top and bottom ends of the wave crest, and sealing it by welding, and has a fin-like protrusion part 22 and 23 on the left and right sides and ends. A bent side portion 24.25 is formed approximately parallel to the overhang 1fli22.23.

As shown in FIGS. 6 to 8, the corrugated heat sinks 20 on two of the four sides have a length x equal to the length of the long side of the upper and lower frames 12 and 13 plus the length of the short side of the support 16. 'V has a width equal to this, and the upper and lower ends of the center part 20a are placed on the upper and lower sides of the frame body 12.13.
:VC'M, the upper and lower ends of the left and right extensions 20b are stacked on one side of the column 16 and joined oil-tightly by m-joints, and the left and right side parts 24 are stacked on the side IC on the long side of the column 16, Its edges on three sides are welded together in an oil-tight manner.

The other two corrugated heat sinks 21 have widths equal to the short side length y/vc of the upper and lower frames 12.13, and weld their upper and lower ends overlapping the short sides of the upper frame 12.13. The three end edges of the left and right portions 25 and the side surface of the short side of the T-pillar 16 are welded together to form an oil-tight joint. It is a combination.

Figure 7 A-A of the tank body formed as in No. 9 C. L sectional view and FIG. 10 are the same (line BB in FIG. 6 of the tank body) and sectional view along line C-C in FIG.
．． The welded portion between the corrugated heat sink 20.21 and the strut 16, and 2q26C1 indicate the welded portion between the corrugated heat sink 20.21 and the strut 16.

9th; λ, 10th V can be seen.f'+Ilc According to the above configuration, the struts 16'IC at each corner of the tank 11 generate 50,000'f! r: Recessed, extension part 2 of the corrugated heat sink 20
A curved line 27 whose both sides are covered by the curved line 25Vc of the corrugated heat sink plate 21 is formed, and the oil in the tank is formed into the extension part 20b of the corrugated heat sink plate 20 through this curved line 27. The inner part of the fin-shaped overhanging part 22 and the side part 2 of the corrugated heat sink 20
4 and the support column 16 as shown by the arrow in FIG.

Therefore, with the same external dimensions as the conventional tank shown in FIGS. 1 to 3, the heat radiation area is increased by an amount corresponding to the extension part 20b of the corrugated heat sink 20, and the tank corner that the conventional tank had It is possible to utilize the dead space of 1≠2 as a heat dissipation surface to the maximum extent possible.

Moreover, if this tank 11 is subjected to pressure n', a force corresponding to M shown in FIG. is also applied, and the moment of the force causes the abdomens 22b, 231 of the fin-like projections 22.23 facing the side portions 24.25 to
) VcMlc opposing force acts (Similarly, side portion 24 .
25 also acts against M from the abdomen 22b123b of the fin-like protruding part 22.23 facing it (as a result, the fin-like protruding part 22.23 and the side part 24.25 face each other). Almost symmetrical deformation (bulge) occurs in the abdomen, and the amount of deformation f is 22.
a, the same amount of deformation f1 occurring in 23a (!, medium f,
), which is significantly smaller than in the case where the side portions 24 and 25 are not provided. As a result, it is possible to obtain a tank that is balanced in strength and does not have the man-balance of deformation amount as in the past, and the constraints from the strength aspect on the height and number of fin-like overhangs are reduced. It becomes possible to make the heat dissipating serum larger.

Furthermore, according to the above configuration, the outermost part of the tank has a highly rigid structure.
・Prop 16-: Provided with: Imperial Palace, this post 16 has hanging ears f! A28-? - A pull hole 29 for pulling the roller is provided, and a jack receiving part 30 is provided below the column fixing part of the base member 17.
By providing a handle hole 29 for pulling the roller, there is no need to worry about unbalanced cuffs on the corrugated heat sink of the tank body when lifting equipment, pulling it with rollers, or pushing it up with jacks.
This prevents cracking of the weld bead, which causes oil leakage.

The support column 16 extends upward from the upper frame body 12, and has a hanging ear part 28 at its upper end. By doing this, the shackle 627i- of the hanging rope 31 is attached to the hanging ear part 28 as shown in FIG.
When hooked, the hanging rope or shackle may be attached to the tank cover 33.
It is possible to avoid contact with some structures such as the terminal box, terminal box, etc. that are installed on top of the terminal box.

@1 As shown in Figure 1, in a conventional tank in which a hanging ear part (34) is provided on the upper frame body 5, the height of the rope on the upper frame body 5 is increased ( I had to take it, but
By providing the hanging ear part 28 at the upper end of the support column 16 as described above, the height m of the lower frame 12 can be made smaller (to give an example of the dimension m, the conventional 110- and t As a result, the height of the tank can be lowered, and the rigidity of the upper frame 12 can be increased, so that the f-shape of the upper frame 12 due to the internal pressure of the tank can be reduced. This makes it possible to further suppress the stress generated at the welded portion of the upper frame and the corrugated heat sink, thereby increasing the pressure resistance of the tank.

The J'V"e receiving portion 30 is formed by cutting out a part of the ground surface of the base member 17 in order to improve the printability.

The following table shows an example comparing the dimensions and weight of the conventional tank shown in FIGS. 1 to 3 and the tank according to the present invention for a three-phase 1000 KVA oil-filled pressure vessel.

As explained above, according to the present invention, the temperature control of the height and number of fin-like extrusion parts can be controlled from the viewpoint of strength by controlling the b-electrical shape of the corrugated heat sink according to the internal pressure of the tank. and the conventional 'J'ri''' shown in Figures 1 to 3.
Place corrugated heat sinks in the dead spaces at the four corners.
This type of corrugated heat sink can also be used for medium to large capacity oil-filled air equipment tanks. By effectively utilizing C', it is possible to make the small eaves of the separate vessel lighter.

17N of lA plane Small explanation Figure 1 is a front view of a transformer with a conventional tank using a corrugated heat sink, Figure 2 is a cross-sectional view of the body of a conventional tank,
Fig. 3 shows an enlarged view of the main part, Fig. 4 shows an explanatory diagram of the deformation of a conventional tank due to internal pressure, and Fig. 5 shows another conventional example of an oil-filled electric one-piece tank using four corrugated heat dissipators. 6, 7, and 8 are a front view, a side view, and a plan view of the tank for oil-filled electrical equipment according to the present invention, respectively. Cross section of the main parts of the 111th cross section of the cross section of the cross section of the 10th part (Fig. 6 B-B line 9th cause Cf A perspective view showing a part of the heat dissipation unit) Figure 12 shows the hanging J-Ibl
It is a figure which shows the 1st renewal state of S.

11...Tank 12, lower frame 13...lower frame 16...pillar 17...base member 20.21...corrugated heat sink 20b...extension portion 22 of temporary combustion heat sink 20 .23...Fin-like stretch part 24.25...Side part 27 of the corrugated heat sink 20.21.
...7 Yuke 28... Hanging capital 29... Notch part 4 Fig. 5 Fig. 6I21 -77 Fig. 8 Fig. 0 Fig. 99 $ lO Fig.

Claims (2)

[Claims] (1) A tank for oil-filled electrical equipment whose body is made up of a corrugated heat sink with multiple fin-like protrusions closed at the top and bottom between each side of the upper and lower frames. Then, from each corner of the upper frame body and the lower frame body, a cross-sectional shape extending parallel to one side of both frames has one side of the oil pipe and the other side is located at the outermost side. A support is provided, the lower end of which is connected to the base member, and which is engaged with the upper and lower frames, and both of the It? The extended part of the corrugated heat sink stretched on each side of the iLM of the four bodies and the side part bent almost parallel to the fin-like overhang part are overlapped on one side of the pillar, and the end edge is made oil-tight. Joining 1-1 Also, bend fC almost parallel to the fin-like protruding parts of the corrugated heat sink stretched on each of the other sides of the frame body, and overlap the side parts with one side of the support column. A tank for oil-filled electrical equipment characterized by having an oil-tight joint at the edges. (2) The strut extends upward from the upper frame and has a hanging ear at its upper end.
Tanks for oil-filled electrical equipment as described in ).