JPH09293813A - Sealed self-cooling case filled with cooling oil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed self-cooling case filled with cooling oil in which both ends of each of radiating pipes are fixedly attached to at two upper and lower positions in the depth direction of the inner wall of the case, thereby enabling the size of the case to be reduced without providing a member for cooling on the outer side of the case. SOLUTION: Both ends of each of radiating tubes 12 are fixed to two positions in the depth direction on the inner wall of a sealed self-cooling case 11 filled with cooling oil so that the outlet and inlet of each tube are made to communicate with the outside air. The sealed self-cooling case 11 has a cylindrical shape and the radiating tubes 12 are fixed to a plurality positions on the inner wall face of the case. With such construction, the radiating pipes 12 are attached on the inner face of the sealed self-cooling case 11 so as to be inside the case and the cooling oil 3 is injected to a level slightly higher than the upper attaching position of each of the radiating pipes 12. The outside air around the case enters from a lower part b1 of each of the radiating pipes 12 and comes out through an upper part b2, thereby lowering the temperature of the cooling oil 3 around each of the radiating pipes 12 increased by heat generated in the case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-filled sealed type self-cooling case that radiates heat generated in a case by utilizing convection due to a temperature difference of cooling oil, and in particular, for heat radiation mounted on an outer peripheral side surface. The present invention relates to an oil-filled sealed self-cooling case capable of removing fins or heat radiation tubes.

[0002]

2. Description of the Related Art A conventional oil-cooled self-cooling case is shown in FIG.
As shown in (a), (b) and (c), the heat dissipating fins 2 are mounted at a plurality of positions on the outer peripheral side of the cylindrical case 1 containing the cooling oil 3, or as shown in FIGS. As shown in (b) and (c), a plurality of tubular pipes 5 are attached to the outer peripheral side surface of the case 4 containing the cooling oil 3. Then, the heat generated when the electric components inside the case are energized is cooled by using the cooling oil 3 as a medium, and the warmed cooling oil 3 is naturally cooled by the heat radiation fins 2 or the heat radiation pipes 5 outside the case, and the temperature is further increased. The cooling oil 3 having a reduced value is circulated in the case by convection.

[0003]

However, the conventional oil-filled self-cooling case, as shown in FIGS. 3 and 4, can be cooled by the heat-radiating fins and heat-radiating pipes mounted on the outer peripheral side surface of the case. , The outer dimensions of the case become large. Further, the heat dissipation fins and the heat dissipation pipes mounted on the outer peripheral side surface of the case cannot have a shape having the same strength as the case, resulting in damage. The present invention has been made in view of the above-mentioned points, and an object thereof is to provide no cooling member on the outside of the case, and further to consider the strength of the cooling member more than the conventional one. An oil-filled closed type self-cooling case is provided.

[0004]

In a closed type self-cooling case containing cooling oil, a heat radiation pipe is fixed so that the upper and lower position inlets and outlets on the inner wall side of the case and in the depth direction can communicate with the outside air. It is configured by. The case has a cylindrical shape or a rectangular tube shape, and the heat radiation tubes are fixed to the case at a plurality of locations on the inner wall surface of the case. Furthermore,
A shay plate is installed inside the heat dissipation pipe at a position where cooling oil can convection.

By virtue of the construction described above, FIG.
As shown in, the heat dissipation pipe (pipe) 12 is attached to the outer peripheral side surface of the closed type self-cooling case 11 at a position to enter the inside of the case,
By injecting the cooling oil 3 to a level slightly above the upper mounting position of the heat radiating pipe 12, the heat generated in the case enters the outside air around the case from the lower b1 of the heat radiating pipe 12 and escapes to the upper b2. The temperature of the cooling oil 3 around the heat radiation pipe 12 is lowered. The cooling oil 3 of which the temperature has dropped sinks to the bottom and is heated again so that the cooling oil 3 convects. An embodiment of the present invention will be described in detail below with reference to the drawings.

[0006]

1 (a), 1 (b) and 1 (c) are overall configuration diagrams showing an embodiment of the present invention, wherein FIG. 1 (a) is a plan view and FIG. 1 (b) is a front view. FIG. 2 (c) is a sectional view taken along the line AA, and FIG. 2 is a front view when the one in FIG. 1 is used.
1 (a), (b), and (c), the pipes 12 are fixed to the inner wall side of the case 11 and at two positions above and below in the depth direction so that the inlet and outlet can communicate with the outside air. . Further, the case 11 has a cylindrical shape, and the fixing locations of the tubes 12 are provided at a plurality of locations on the inner wall surface of the case.

In the embodiment shown in FIG. 2, the case 13 is divided into upper and lower two stages, and the lower side case 13a is provided with electric parts having a small heat generation amount. The semiconductor module 14 and the like are mounted on the upper part of the lower stage, the heat sink 15 for heat radiation is exposed to the bottom of the upper case 13b, and the heat generated by the energization of the semiconductor module 14 is conducted to the cooling oil 3 through the heat sink 15. In addition, the electric component 8 such as a reactor that generates a large amount of heat is attached to the upper case 13b.
It is mounted almost at the center of the cooling oil to conduct the generated heat to the cooling oil 3. And a shay plate for better convection of the cooling oil 3
16 is arranged at an intermediate position between the electric component 8 such as a reactor and the heat radiation pipe 12. The cooling oil 3 heated by the semiconductor module 14 and the electric components 17 such as the reactor moves to the upper part and flows into the upper part a1 in FIG. Outside air around the case enters the heat dissipation pipe 12 from the lower part b1 and the cooling oil 3
Is absorbed and discharged to the upper part b2. The cooling oil 3 is cooled in the gap between the heat radiating pipe 12 and the shay plate 16, and the lower part a2
Return to The re-heated cooling oil 3 convects.

[0008]

As described above, according to the present invention, it is not necessary to increase the outer size of the oil-filled closed type self-cooling case for the purpose of heat dissipation, and the effect of preventing damage to the case can be obtained. Made possible

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a front view showing an application example of FIG.

FIG. 3 is an overall configuration diagram showing an example of the related art.

FIG. 4 is an overall configuration diagram showing two conventional examples.

[Explanation of symbols]

 1 Case 2 Heat dissipation fin 3 Cooling oil 4 Case 5 Heat dissipation pipe 11 Case 12 Heat dissipation pipe (tube) 13 Case 13a Upper case 13b Lower case 14 Semiconductor module 15 Heat sink 16 Shahe board 17 Electrical parts such as reactor

Claims (3)

[Claims] 1. In a closed self-cooling case containing cooling oil, heat-radiating pipes are fixed to the inner wall of the case and at two positions vertically in the depth direction so that the inlet and outlet can communicate with outside air. A sealed self-cooling case with oil. 2. The oil-filled closed type self-cooling case according to claim 1, wherein the case has a cylindrical shape or a rectangular tube shape, and the heat radiation tubes are fixed at a plurality of locations on the inner wall surface of the case. . 3. The oil-filled sealed self-cooling case according to claim 1, wherein a cylindrical shay plate is provided inside the heat dissipation pipe at a position having a gap to allow convection of the cooling oil.