JPH06132141A - Tank of transformer for distribution - Google Patents

Abstract

PURPOSE:To reduce a used material so as to lighten a tank and cut down the cost by thickening the corrugated heat radiation plate on the long side of a tank, and thinning the corrugated heat radiation plate on the short side of the tank. CONSTITUTION:Corrugated heat radiation plates 13 and 14, which have many heat radiation fins 13a and 14a wherein insulating medium is circulating, are attached to the periphery of a tubular upper frame and a box-shaped bottom. For the corrugated heat radiation plate 13 arranged on the long side of a tank, the length of the projection of the heat radiation fin 13a is made long, and for the corrugated heat radiation plate 14 arranged on the short side of the tank, the length of the projection of the heat radiation fin 14a is made short.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution transformer tank, and more particularly to a distribution transformer tank having a corrugated heat dissipation plate attached to a tank side plate.

[0002]

2. Description of the Related Art In a tank used for a distribution transformer, as a radiator, a system is often used in which a radiating fin formed by corrugating a single thin plate is formed on a side plate of a tank body. The radiator fins are arranged so that the radiator fins with the same protruding length are arranged around the entire circumference of the tank depending on the transformer capacity, and the radiator fins with a large protruding length are arranged on the long side of the tank and the protruding length is arranged on the short side. Generally, a method of arranging small radiating fins and a method of arranging them in reverse are adopted. Further, since this type of transformer is of a hermetically sealed type, the projecting length and thickness of the heat radiating fins are determined so that the heat radiating fins do not expand or contract due to the internal pressure, and the permanent deformation does not occur.

A tank of a type in which the protruding lengths of the long side fins and the short side fins are changed is a cylindrical upper frame portion provided with a top band for applying packing to the upper portion and a box-shaped bottom portion. Two long side corrugated heat dissipation plates and two short side corrugated heat dissipation plates are respectively wound around the outer circumference, the entire upper and lower perimeters are welded, and the joints of adjacent corrugated heat dissipation plates are lengthwise. Welded in each direction to form the tank.

Here, the corrugated heat dissipation plate on the long side has a thickness T ₁
One plate is formed into a wavy shape with a protruding length H ₁ , and both ends of each wave are drawn, and a plurality of heat radiation fins are welded in an oil-tight manner in a continuous manner. The corrugated heat dissipation plate is formed by continuously forming a plurality of heat dissipating fins having a thickness T ₁ and a protruding length of the dissipating fins that is a dimension H ₂ shorter than the protruding length H ₁ of the dissipating fins of the corrugated heat dissipating plate on the long side. I will do it.

[0005]

Generally, each of the two corrugated heat dissipation plates uses a material having the same plate thickness T ₁ . This plate thickness T
₁ is set to a thickness so that the heat radiation fins with a long protruding length will not be permanently deformed due to internal pressure fluctuations, so the thickness of each corrugated heat radiation plate will be thicker overall, not only increasing the weight but also increasing the material cost. There was a problem of getting higher.

The present invention has been made in consideration of the above points, and reduces the material used by changing the plate thickness according to the protruding length of the heat radiation fins to reduce the cost and the weight of the distribution transformer. The purpose is to provide a tank.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a corrugated heat dissipation plate having a large number of heat dissipation fins through which an insulating medium circulates is attached around a cylindrical upper frame part and a box-shaped bottom part, of which the tank length is long. A corrugated heat sink placed on the side has a long protruding length of the heat dissipating fins, and a corrugated heat sink placed on the short side has a short protruding length of the heat dissipating fin. Increase the thickness of the long side corrugated heat sink,
The corrugated heat dissipation plate on the short side of the tank is characterized by having a thin plate thickness.

[0008]

The radiating fin is deformed as shown by the dotted line by the fluctuation of the internal pressure of the transformer as shown in FIG. FIG. 5 shows a case where a positive pressure is applied, and in the case of a negative pressure, the groove is depressed. The deformation amount δ returns to zero when the pressure is returned to zero when the pressure is equal to or lower than a certain pressure P, and the radiating fin does not permanently deform. This P is called a withstand voltage value, and theoretically P
= K · T ² / H ² It has been proved experimentally. Here, K is a constant determined by the material. From this formula, the plate thickness T is Therefore, if the pressure resistance value P is set to a certain value, the plate thickness T of the radiation fin is proportional to the protrusion length H. Therefore, if the protrusion length H of the heat radiation fin is reduced, the plate thickness T of the heat radiation fin can be reduced, and the weight and the material cost can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1 and FIG. 2, two long side corrugated heat dissipation plates 13 are provided on the outer circumference of a cylindrical upper frame portion 11 provided with a top band 11a for applying packing to the upper portion and a box-shaped bottom portion 12, Two of the short side corrugated heat sinks 14 are wound around the corresponding long side and short side, respectively, and the entire upper circumference 15a and the lower whole circumference 15b thereof are welded to each other, and further adjacent corrugated heat dissipation boards are provided. The tanks are formed by welding the joints 16a and 16b of 13 and 14 in the vertical direction, respectively.

As shown in FIG. 3, the long side corrugated heat dissipation plate 13 is formed by forming a plate having a thickness T ₃ into a wave shape having a protruding length H ₃ and drawing both ends of each wave. A plurality of heat radiation fins 13a welded oil-tightly are continuously formed. Further, the corrugated heat dissipation plate 14 on the short side has a thickness T ₄ as shown in FIG.
The protrusion length H ₄ is shorter than the protrusion length H ₃ of the radiator fin 13a of the corrugated radiator plate 13, and a plurality of radiator fins 14a are continuously formed.

These protruding lengths H ₃ , H ₄ , plate thicknesses T ₃ , T
Between ₄ have a relationship of _{H 3> H 4, T 3} > T 4, the thickness T ₄ may be set to _{H 4 / H 3 × T 3} . In such a configuration, as described with reference to FIG. 5, the relationship among the protruding length H, the plate thickness T, and the withstand voltage value P of the heat radiation fins forming the corrugated heat radiation plate is as follows. Have a relationship. This means that if the withstand voltage value P is set to a certain value, the plate thickness T and the protruding length H are in a proportional relationship, and it is possible to increase T by increasing H and decrease T by decreasing H. . Therefore, the heat radiation fins 13a of the corrugated heat radiation plates 13 and 14 on the long side and the short side that form the tank side plate,
It is understood that the withstand voltage value can be set to a required value even if the plate thicknesses T ₃ and T ₄ are changed according to the protruding length of 14a. According to this structure, the corrugated heat dissipation plates 13 and 14 on the long side and the short side can be made of a material having an optimum plate thickness, and the weight and the material cost can be reduced.

[0012]

According to the present invention, as described above,
By changing the plate thickness of the corrugated heat dissipation plate in accordance with the protruding length of the heat dissipation fin, the weight can be reduced, the material cost can be reduced, and a low cost and lightweight transformer can be provided.

[Brief description of drawings]

FIG. 1 is a plan view showing a partial cross-section of a tank of a distribution transformer according to an embodiment of the present invention.

FIG. 2 is a right side view of FIG.

3 is a perspective view showing a long side corrugated heat dissipation plate used for the tank of the distribution transformer of FIG. 1. FIG.

FIG. 4 is a perspective view showing a short side corrugated heat dissipation plate used for the tank of the distribution transformer of FIG.

FIG. 5 is a cross-sectional view illustrating a deformed state of the heat radiation fin due to internal pressure.

[Explanation of symbols]

11 is an upper frame portion, 12 is a bottom portion, 13 is a long side corrugated heat sink, 13a is a radiator fin, 14 is a short side corrugated heat sink,
14a is a radiation fin, 15a, 15b, 16a, 16b
Indicates a welded portion.

Claims (1)

[Claims] 1. A corrugated heat dissipation plate having a large number of heat dissipation fins, through which an insulating medium circulates, is mounted around a cylindrical upper frame part and a box-shaped bottom part, and the corrugated heat dissipation plate is arranged on the short side of the tank. Is a corrugated heat sink placed on the short side of the tank with a small protruding length of the heat radiating fin. A tank for a distribution transformer, characterized in that the plate thickness is thick and the corrugated heat dissipation plate on the short side of the tank is thin.