JPS60140709A - Tank for stationary induction electric apparatus - Google Patents

Abstract

PURPOSE:To reduce the number of steps and to increase the vacuum resistance strength of a tank having a long side wall of a flat plate and a short side wall of a partly cylindrical shell by selecting the radius R of the shell, an opening angle theta, a side wall length L and a coefficient (a) in the prescribed relationship. CONSTITUTION:In a body 11, the side wall 15 of a partly cylindrical shell, and a side wall 13 of length L are secured, a bottom plate 16 is secured, a flange 17 is mounted at the periphery of an opening, a reinforcing beam 18 is mounted at the wall 13 at a horizontal interval, and a reinforcing beam 18a is attached to the plate 15. R, theta are selected to the relationship of 2Rsintheta<=atheta<2>, further a= 4.75X10<-4>L is selected in case of L=0-2,500; a=7.375X10<-4>L-0.65 is selected in case of L=2,500-4,000, a=9.67X10<-4>L-1.6 is selcted in case of L=4,000- 6,000, and a=1.23X10<-3>L-3.18 is selected in case of L>=6,000, where L is mm., theta is degrees as units. According to this constitution, when vacuum outer pressure is applied, the force P2 at the end of the shell can be reduced to the force PB of the end of the flat plate side, thereby obtaining a tank having excellent buckling resistance strength. The conventional cover and the bonding members of the body can be eliminated, and the size and the number of steps can be diminished.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a stationary conductor tank, and more particularly to an improvement of a tank body having a flat long side wall and a short side wall consisting of a partially cylindrical shell.

[Technical background of the invention and its problems]

A stationary induction device 1, such as a transformer or accelerator, for example a conventional transformer tank 1, is shown in FIGS. 1-13. The tank body 1a has flat long sides 11111 and walls 2 that are parallel to each other.
Short side walls 3 made of partial cylindrical shells are welded to both ends of the housing, and a flat bottom plate 5 is welded to both ends of the housing.

And the long side of the tank body 1a! S! 2, a plurality of reinforcing beams 6 are fixed in the vertical direction, and the bottom plate 5 is also provided with reinforcing beams 6a. Further, a reinforcing beam 7a is fixed to the flat plate lid 7 vertically, that is, in accordance with the position of the longitudinal reinforcing beam 6, and a connecting member 8 is provided at both ends of the reinforcing beam 7a, and the connecting member 8 and the vertical reinforcing beam 7a are fixed to each other. 6 by bolts or welding.

Although it is not shown in the figure, a transformer main body having a winding wound around an iron core is housed inside the transformer tank 1, and the inside of the transformer tank is filled with insulating oil after being evacuated.

For the vacuum external pressure caused by evacuation when injecting X-edge oil into the conventional transformer tank and the oil pressure inside the tank during operation of the transformer, there is a problem in the direction perpendicular to the flat long side wall 2. The bending rigidity of the reinforcing beam 6 fixed to the partial circle f4.
) It is designed to withstand the buckling strength and bending rigidity of the short side walls 3 made of shells.

Therefore, if the upper part of the reinforcing beam 6 and the flat plate lid 7 are misaligned due to the external vacuum pressure or the oil pressure inside the tank, the stiffness of the reinforcing beam will be reduced, and the buckling resistance may be impaired. Therefore, the upper end of this reinforcing beam 6 and the peeled IA portion of the flat plate lid 7 are connected by a connecting member 8. However, in order to firmly connect the reinforcing beam 6 and the reinforcing beam 7a of the flat plate lid 7, the dimensions of the connecting member 8 become large, which results in the external dimensions of the transformer tank 1, and the connection There was a problem in that the structure of the reinforcing beams 6, 7a and the like was complicated by providing the member 8, and the number of manufacturing steps for the entire tank increased.

[Purpose of the invention]

The present invention was made in consideration of the above points, and its objectives are to reduce the external dimensions of the tank, reduce the manufacturing man-hours [7], and increase the vacuum resistance and stability. An object of the present invention is to provide an improved stationary induction tank.

[Summary of the invention]

In order to achieve this object, according to the present invention, w-side side plates made of partial cylindrical shells are fixed to both sides of mutually parallel flat plate side walls, a bottom plate is fixed to form a tank body, and a flat plate is attached to the tank body. The lid is installed, and the relational expression between the radius R of the partial cylindrical shell of the short side wall and the opening angle θ is expressed as (1), 2R sin θ ≦ a θ 2 (1) where the flat plate side wall length L By satisfying the above conditions given by equation (11) as a function of It is characterized by

[Embodiments of the invention]

An embodiment of the stationary induction tank of the present invention will be described below with reference to FIGS. 4 to 8. 4 and 5, a stationary induction tank, for example a transformer tank 10, is formed by covering a tank body 11 with a flat plate lid 12. Although not shown, a winding and an iron core around which the winding is wound are housed inside the transformer tank, the tank is filled with insulating oil, and a bushing is provided.

The tank body 11 is formed as follows. In other words, the short side walls 15 made of partial cylindrical shells are fixed to both sides of the long side walls 13 which are parallel to each other, the bottom plate 16 is fixed to the bottom of the short side walls 15, and the flange 17 is provided around the opening side. , and the long side wall 1
3, a plurality of reinforcing beams 18 are horizontally fixed 71 at approximately equal intervals.
11, a reinforcing beam 18a is firmly attached to the bottom plate 16.

The flat plate lid 12 is formed by providing a flange 19 that matches the flange 17 of the tank body 11 and fixing a plurality of reinforcing beams 12a. This flat plate lid 12 is placed over the tank body 11 and fixed via the flanges 17 and 19 to form the transformer tank 10.

Shape of tank body 11 d heel・, 1 side 11 1 1 of wall 15
Radius R and opening angle θ of the partial cylinder of the 11i cylindrical shell
6), the length of the long side wall 13 in the longitudinal direction.

Let the height be H. (See FIG. 5) At this time, the radius R and the opening angle θ are selected so that a curve given by the following equation (1) is established between the radius R and the opening angle θ.

2R sin θ≦a θ2−111 where a is a function of the long side wall length L, and is selected so as to satisfy the condition given by equation (11).

The unit of the above-mentioned length L is a line, and the unit of the opening angle θ is a degree.

Next, the effects of the present invention will be explained. In FIG. 6, the tank body 11 has a flat long side wall 13 and a short side wall 15 made of a partially cylindrical shell, and when a vacuum external pressure is applied to the tank body 11, each end 7; 1
The situation becomes clear.

Now, there is a vacuum external pressure P in this tank body 11. When it acts, the long side! At the 13th section, the end force PB acts on the inside of the tank. Further, in the partial cylindrical shell that forms the short side wall 15, the vacuum external pressure P is applied.

When this acts, a force P1 parallel to the long side wall 13 and a force P2 perpendicular to the long side wall 13 move in the 01M portion, and a force P is transmitted as the resultant force. Here, the partial cylindrical shell has a vacuum external pressure P. It tries to become flat by adding . However, this flattening force,
In other words, the comb is thickest due to the force P2 in the direction perpendicular to the long side wall 13.

Therefore, by canceling out this force P2 with the end force PB of the long side wall 13, the balance between the force P2 of the partial cylindrical shell and the end force PB of the long side wall PB is maintained, and the strength against buckling is increased. and can be stabilized. Therefore, in reality, it is necessary to suppress the force P2 that attempts to flatten the partial cylindrical shell by the end force P of the flat long side wall 13, and by setting P2≦PR, the force P2 This makes it possible to prevent buckling due to oxidation and increase the vacuum resistance, that is, the buckling resistance.

Stationary @i Electric appliances For example, in a transformer tank 10, the length of the long side wall 13 in the longitudinal direction is generally determined, and the length of any one of the tank height H (see Figure 5) and tank width W is determined. If so, the dimensions of the entire tank are determined. This is due to electrical constraints due to the transformer capacity, for example, r■-]fiη-shaped winding dimensions and insulation distance. In order to satisfy the above boundary P2≦PB, the long side wall 13
Since the end force PB is given by PB-7LH, the force P perpendicular to the long side plate 13 at the end of the partial cylindrical shell is
2 to below PB by selecting an appropriate radius R and opening angle θ of the cylindrical shell.

FIG. 7 is a diagram showing the results of experiments using various model tanks. The upper half shows the force P2 (kg) at the end of the partial circular f (support) shell on the vertical axis, the opening angle 0 on the horizontal axis, and each curve with the radius R of the partial cylindrical shell as a parameter. There is. Also, in the lower half, the vertical axis is the tank width W (+++
m), and the horizontal axis is shared with the upper half, and the opening angle is 0,
Each curve is shown with the radius R of the partial cylindrical shell as a parameter. In this manner, FIG. 7 summarizes how the force P2 in the direction perpendicular to the long side wall at the end of the partial cylindrical shell changes depending on the partial circle f61, the shell radius R1, and the opening angle θ.

1, the tank width W at that time is geometrically W = 2Rsin
It is given by θ. From the above results, when the length L of the long side wall is constant and P2-PB, the radius R1 of the partial cylindrical shell
Opening angle 0. The relationship with the tank width W will be explained.

Again, in the upper half of Figure 7, the radius R of the partial cylindrical shell is L-2500, 4000 as a parameter.

6000xm and draw a dashed dotted line parallel to the horizontal axis, take the value of the intersection of this dashed dotted line and the curve of the parameter of radius R on the curve of the parameter of each radius in the lower diagram, Thick line: L=2500゜L=400
0, draw a curve of L=6ooo.

For example, in a tank that adopts a partially cylindrical shell when the length L of the flat long side wall is 2500 mm, P2≦P
In order to satisfy B, the radius R and the opening angle θ must be designed within the range surrounded by the curve L = 2500 mm and the axis of the opening angle θ, taking into account the tank width W. , it is possible to provide a transformer tank with excellent buckling resistance.

For example, as a transformer tank, L=2500y+shoulder, W=
If a shell with a diameter of about 1200 mm is selected and the radius R within the range that satisfies this tank width W is 1000 mm, it will be a partial cylindrical shell with an opening angle of about 38° as shown by the dotted line.

Also, the tank width of the tank body W = 1200 + nm ~ 30 by the curve with the length L shown by the thick line in Fig. 7 constant.
Approximately applying a quadratic function formula within the range of 00mm, 2Rsinθ from tank'iN W = 2 Rs inO
=a02, and the relationship between the coefficient a of each curve and the length of the long side wall is summarized as shown in FIG.

In FIG. 8, the length L of the long side wall is generally about 2500
+nm to 7000m+x. So the song? When urine is divided into lengths L and approximately applied to a linear function equation, the following equation (11) is obtained.

The interval approximately 2R5in0=aθ2 is valid within the range of the coefficient a in equation (11). That is, in order to increase the corrosion resistance J11'' strong IW and to make the force P2 at the end of the partial cylindrical shell less than 9 the force at the end of the flat sea bream side wall, from the diagram shown in FIG.
By designing by adopting radius R and opening angle θ within the range that takes tank width W into account, the seat resistance can be improved within the range defined by the length ■7 being constant, the radius w2Rsinθ=aθ2, and the opening angle θ. A transformer tank with excellent bending strength can be provided. Also, the coefficient a of the curve 2Rsinθ=aθ2 is 1 of the length L.
It is given by the following functional formula and is a valid curve within the limited range of length L.

In the embodiments of the present invention, a structure in which a reinforcing beam is attached horizontally to a flat long side wall has been described. Of course, it can be applied to heavy equipment tanks in general.

As described above, according to the present invention, the flat plate lid and the tank body are not fixed together by a joining member as in the past, and the joining member can therefore be removed, so that the external dimensions of the tank can be reduced. It is possible to reduce the number of manufacturing steps, increase the buckling resistance in vacuum, and obtain a stable %Ii degree.

〔Effect of the invention〕

As explained above, according to the present invention, the long side wall of the flat plate shape and the short side wall of the partial cylindrical shell are (+:i+), and the relational expression between the radius R and the opening angle θ of the partial cylindrical shell is (1 ), and the length L of the long side wall and the coefficient a are expressed as (11) by 71:1'f1
By selecting such a material, it is possible to reduce the external dimensions of the tank, reduce the number of manufacturing steps, and provide a static induction tank that has increased vacuum resistance and improved stability.

[Brief explanation of drawings]

Figures 1 to 3 show conventional transformer tanks;
The figure is a plan view of the tank body. FIG. 2 is a side view, and FIG. 3 is a sectional view. Figures 4 and 6I (Figure 5 shows the transformer tank of the invention;
Figure 4 is a plan view of the tank body. Figure 5 is a side view of the transformer tank. FIG. 6 is an explanatory diagram showing the distribution of force due to direct air pressure on the tank body. Figure 7 shows the relationship between the end force P2 of the partial cylindrical shell of the tank body and the opening angle ly and I, and the relationship between the tank width and the opening angle.
Characteristic diagrams in which the radius R is set as . FIG. 8 is a diagram showing the relationship between length L and coefficient a. 10...Transformer tank, 11...tank body. Work 2: Flat plate lid, 13: Long side wall, 15: Short side wall. 17.19...Flange, 12a, 18, 18a・
・Reinforcement beam. R: Radius of the partial cylindrical shell, 0: Opening angle of the partial cylindrical shell. L: Length of the long side wall in the longitudinal direction. Agent Patent Attorney Inoue - Male Figure 3 Figure 4 Figure 5 Figure 7 Figure 8 Figure 8 M, 0

Claims (1)

[Claims] In a stationary induction tank having a short side wall and a flat long side wall of a partial cylindrical shell, the radius R of the partial cylindrical shell and the opening angle θ are (1). and a stationary induction electric tank characterized by being selected according to formula (11). 2Rsir+17≦aQ2. ,, where a is a function of the length in the longitudinal direction of the long side wall, (
11) is given by Eq.