JPH0786779A - Heat exchanger in sealed enclosure - Google Patents

Abstract

PURPOSE:To improve cooling efficiency by forming a ventilation path between both end apertures of an outer cylinder, in the inside of the outer cylinder surrounding heat absorbing fins, and installing a fan in one end aperture of the outer cylinder. CONSTITUTION:An outer cylinder 6 surrounding heat absorbing fins 5 is installed. A ventilation path 13 is formed from one end aperture 7 of the outer cylinder 6 to the other end aperture 12. A fan 8 is arranged in the one end aperture 7 of the outer cylinder 6. By driving and rotating the fan 8, the air carrying heat in a sealed enclosure 2 is collectively taken in the outer cylinder 6. By making the ventilation path 13 nonlinear, the heated air passes the ventilation path at a suitable speed, and sufficiently collides against the heat absorbing fins 5, so that the heat is effectively absorbed and cooled. Thereby cooling efficiency is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange device for a closed housing.

[0002]

2. Description of the Related Art Generally, electric power semiconductor elements used in vehicle inverters are mounted in a closed casing and installed under the floor of a vehicle to prevent contamination due to dust, etc. A heat exchange device is used to protect the semiconductor element and the like by suppressing an increase in temperature inside the housing due to the above.

As a heat exchange device for such a closed casing,
Conventionally, a vehicle semiconductor device described in Japanese Utility Model Application Laid-Open No. 58-20541 is known. In this device, a heat conducting tube with heat absorbing / radiating fins is provided in a hermetically sealed casing, and the finned tube is used. The heat generated from the semiconductor element or the like is exchanged with the air outside the hermetically sealed case to escape.

[0004]

However, in the above-mentioned conventional device, since the air having hot air is agitated by the fan in the hermetically sealed case so that the heat absorbing fin absorbs the heat, the space between the fan and the heat absorbing fin is reduced. In addition, when equipment other than the semiconductor element is installed, there is a problem that the air is not directly contacted with the heat-absorbing fins because of being blocked by the equipment, the wind speed becomes low, and the cooling efficiency becomes poor.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the conventional problems as described above and to provide a heat exchange device of a hermetically sealed casing which is excellent in cooling efficiency.

[0006]

In order to achieve the above-mentioned object, the present invention is provided with a heat conducting pipe body penetrating through the wall surface of the hermetically sealed casing, and is provided outside the hermetically sealed casing. In a heat exchange device for a hermetically sealed housing, in which a heat dissipation fin is provided at a portion corresponding to the inside of the tubular body, and a heat absorption fin is provided at a portion corresponding to the inside of the hermetically sealed housing of the tubular body, an outer cylinder body surrounding the heat absorption fin is provided. An air passage extending from one end opening to the other end opening of the outer tubular body is formed inside the outer tubular body, and a fan is arranged in the opening at one end or the other end of the outer tubular body. It was set up.

Further, the air passage is a non-straight air passage formed by the heat absorbing fins.

[0008]

By rotating the fan, the hot air in the hermetically sealed casing can be intensively taken into the outer cylinder.
If the ventilation passage is made non-straight, the hot air passes through the ventilation passage at an appropriate flow velocity and hits the heat absorbing fins sufficiently, so that heat is efficiently absorbed and cooled.

[0009]

The present invention will be described in detail below with reference to the drawings showing the embodiments.

FIG. 1 shows an embodiment of a heat exchange device for a closed casing according to the present invention. This heat exchange device 1 is for heat conduction provided through a wall surface of a closed casing 2. Tube 3 and
The radiating fins 4 are provided in a portion of the pipe body 3 corresponding to the outside of the closed casing 2, the heat absorbing fins 5 provided in a portion of the pipe body 3 corresponding to the inside of the closed casing 2, and surround the heat absorbing fins 5. An outer cylinder body 6 and a fan 8 arranged at one end opening 7 of the outer cylinder body 6 are provided.

The closed casing 2 is mounted under the floor of the vehicle,
In the closed casing 2, together with the outer cylinder body 6 and the fan 8 and the like,
A heating element 9 such as a power semiconductor element is incorporated.

The heat conducting tube 3 is made of alcohol in a copper tube.
When the heat generated from the heating element 9 is absorbed by the heat conducting tube 3 through the heat absorbing fins 5, the heat is transferred to the above-mentioned operation. It is transmitted to the radiation fin 4 through the medium,
Heat is radiated by heat exchange between the heat radiation fins 4 and the air outside the closed casing 2.

The heat radiation fins 4 and the heat absorption fins 5 are flat plate bodies 10 and 11 made of copper or aluminum having good heat conduction, and are formed in a predetermined shape orthogonal to the axial center of the tube body 3, respectively. Plural sheets are arranged side by side at intervals.

Inside the outer tubular body 6, a non-straight air passage 13 extending from one end opening 7 of the outer tubular body 6 to the other end opening 12 thereof.
Is formed.

In the present invention, the "non-straightening" ventilation passage 13 is a meandering shape (see FIG. 1), a spiral shape (see FIG. 4), a repeated expansion / contraction pattern (see FIG. 2), or the like. The hot air inside the tubular body 6 passes from the opening 7 at one end to the opening 12 at the other end.
To the air passage 13 formed by the shape or arrangement of the heat-absorbing fins 5 itself, rather than merely advancing in a straight line.
Means

That is, in the embodiment of FIG. 1, among the flat plate members 11 ... Of the heat absorbing fins 5, the adjacent flat plate members 11a and 11b are connected to the tubular member 3
Are arranged so as to be offset from each other in the direction orthogonal to the axis of
, 11b ... and the outer cylinder body 6 form a meandering ventilation path 13.

If the fan 8 is driven to rotate,
The hot air in the closed casing 2 concentrates on the outer cylindrical body 6
After passing through the internal ventilation passage 13, the heat absorbing fins 5 are sufficiently contacted with a proper contact time while being sufficiently stirred.

As a result, the amount of heat absorbed by the heat absorbing fins 5 is increased, and the hot air can be cooled efficiently.

In addition, as in the embodiment shown in FIG.
Although it is possible to use a ventilation path 13 that meanders every 11 sheets, in order to reduce the load on the fan 8, as shown in FIG.
The meandering pitch due to a and 11b is loosened, and the outer cylinder 6
It is also preferable to form the ventilation passage 13 formed by arranging several flat plate bodies 11c that do not contact the inner wall of the above.

Next, FIGS. 2 and 3 are modifications of the heat absorbing fins 5, FIG. 2 is a plan view, and FIG. 3 is a sectional view taken along line AA.

In this case, the flat plate members 11 of the heat absorbing fin 5 are formed to have the same outer shape, and the rectangular outer surface thereof contacts the rectangular inner surface of the outer tubular member 6.

Then, of the flat plate members 11, ..., Adjacent flat plate members 11
A plurality of ventilation holes 14a and 14b are respectively provided in a and 11b, and the ventilation holes 14a of the flat plate body 11a and the ventilation holes 14 of the flat plate body 11b are provided.
b are arranged so as to be offset from each other in the direction orthogonal to the axial center of the tubular body 3.

The heat absorbing fins 5 form an air passage 13 from the one end opening portion 7 to the other end opening portion 12 of the outer cylindrical body 6 in which the expansion and contraction are changed repeatedly.

In this case, the number of tube bodies 3 is two, and a plurality of tube bodies 3 may be provided in this way.

Next, FIG. 4 shows another modification of the heat absorbing fins 5.

That is, the heat-absorbing fins 5 have a spiral shape which is continuous from the one end opening 7 to the other end opening 12, whereby the ventilation passages 13 having a spiral change are formed.

The present invention is not limited to the above-mentioned embodiments, and the design can be freely changed without departing from the gist of the present invention.

For example, in each of the above examples, the fan 8 may be arranged not at the one end opening 7 but at the other end opening 12.

If the inside of the outer tubular body 6 can be ventilated from the one end opening 7 to the other end opening 12 or from the other end opening 12 to the one end opening 7, the shape of the heat absorbing fins 5 The shape and the like of the outer cylinder body 6 are not particularly limited.

For example, in the embodiment of FIG. 2, the flat plate body 11
The air is not displaced from the one end opening 7 to the other end opening 12 without shifting the ventilation holes 14a and 14b of the a and 11b in the direction orthogonal to the axial direction.
It is arranged so that it can go straight to (or the opposite direction),
Instead of the ventilation holes 14a and 14b, notches may be provided at the edges of the flat plate members 11a and 11b.

Although not shown, a plurality of strip-shaped flat plates extending in the axial direction of the tubular body 3 may be radially provided on the tubular body 3 to form the heat absorbing fins 5. However, in order to improve the cooling efficiency of the air in the closed casing 2, it is preferable to form the ventilation passage 13 in a non-straight manner by the heat absorbing fins 5.

[0032]

Since the present invention is constructed as described above, it has the following great effects.

According to the heat exchange device of the first aspect, it is not necessary to consider the arrangement of various devices in the closed casing 2, and the hot air in the closed casing 2 is blown by the fan. Since it is possible to intensively take in the inside of the outer cylindrical body 6 by 8 and to reliably apply the hot air to the heat absorbing fins 5, the amount of heat absorption is increased and the cooling efficiency is improved.

According to the heat exchange device of claim 2, hot air is passed through the non-straight air passage 13 at an appropriate flow velocity,
While being sufficiently agitated in the ventilation passage 13, the heat absorbing fins 5 can be sufficiently contacted with a proper contact time so that heat can be efficiently exchanged and the cooling efficiency is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional plan view showing a modified example of a heat absorbing fin.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a cross-sectional view showing another modification of the heat absorbing fins.

5 is a cross-sectional view showing a modified example of FIG.

[Explanation of symbols]

 2 Hermetically-sealed case 3 Heat-conducting tubular body 4 Radiating fins 5 Heat-absorbing fins 6 Outer cylinder body 7 One end opening 8 Fan 12 Other end opening 13 Ventilation path

Claims (2)

[Claims] 1. A heat-conducting tube is provided so as to penetrate through a wall surface of the hermetically sealed housing, and a radiation fin is provided at a portion of the tube corresponding to the outside of the hermetically sealed housing, and the hermetically sealed housing of the tubular body. In a heat exchanging device for a hermetically sealed housing having a heat-absorbing fin provided at a portion corresponding to the inside of the body, an outer cylinder body surrounding the heat-absorbing fin is provided, and one end of the outer cylinder body is provided inside the outer cylinder body. A heat exchange device for a hermetically sealed housing, wherein a ventilation path is formed from the opening to the opening at the other end, and a fan is arranged at the opening at one end or the other end of the outer cylindrical body. 2. The heat exchange device for a hermetically sealed casing according to claim 1, wherein the air passage is a non-straight air passage formed by the heat absorbing fins.