JPH08250629A - Heat exchanger - Google Patents

Abstract

PURPOSE: To improve cooling performance by increasing heat transfer efficiency. CONSTITUTION: A heat exchanger 1 is constituted of a fixing member 3 on which electronic components 2 are mounted, a plurality of plates 4 for heat dissipation which are fixed on the fixing member 3, corrugate fins 5 interposed between each of the plates 4 for heat dissipation, etc. The fixing member 3 is composed of aluminum excellent in thermal conductivity, and planar board members are used for both the surface 3a and the back 3b. The plates 4 for heat dissipation are composed of aluminum in the same manner as the fixing member 3. The one side end part 4a bent in L-shape is soldered on the back 3b of the fixing member 3, and fixed in the state that the end part 4a stands almost straight to the fixing member 3. The plates 4 for heat dissipation are arranged in the width direction of the fixing member 3 so as to keep constant intervals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for cooling a heating element such as an electronic component.

[0002]

2. Description of the Related Art As a conventional technique, Japanese Patent Application No.
There is an electronic component cooler disclosed in the publication. This cooler is for air-cooling electronic components such as power transistors and ICs. As shown in FIG. 9, corrugated fins 100 and plate-like interposition plates 110 are alternately laminated in the vertical direction, and The electronic component 130 is fixed by screws 140 on the mounting plate 120 arranged at the top.

[0003]

However, in the above-mentioned cooler, the heat generated from the electronic component 130 causes the mounting plate 1 to move.
The heat is transferred to the fin 100 of the first stage through the heat transfer plate 20, and then to the fin 100 of the lowermost stage by being sequentially transferred to the interposition plate 110 of the first stage, the fin 100 of the second stage, and the interposition plate 110 of the second stage. In this way, heat is transferred in the stacking direction of the fin 100 and the interposed plate 110 (from top to bottom).
Therefore, the heat transfer efficiency is low, and as the distance from the electronic component increases, that is, as the distance from the electronic component decreases, the amount of heat radiated to the cooling medium significantly decreases in the entire cooler. Therefore, even if the heat transfer area is expanded by stacking the fins 100 and the interposition plate 110, the temperature difference between the fin and the cooling medium, which is the starting force for heat transfer, cannot be made large on the lower side of the cooler, so that the heat transfer is reduced. There is a problem that the cooling performance commensurate with the area cannot be obtained. The present invention has been made based on the above circumstances, and an object of the present invention is to provide a heat exchanger with improved heat transfer efficiency and improved cooling performance.

[0004]

The present invention has the following features to attain the object mentioned above. In claim 1,
A heat exchanger in which a heating element that generates heat upon receiving electricity is fixed, and the heat of the heating element is released to a cooling medium to cool the heating element, in which the heating element is in thermal contact with the surface. In the state of being substantially upright with respect to the back surface of the mounting member, a plurality of flat plate-shaped heat radiating plates arranged side by side at a constant interval, the heat radiating plate, It is characterized in that it has a flat joint surface at a joint end portion with the mounting member, and is joined to the back surface of the mounting member at this joint surface.

According to a second aspect of the present invention, the heat exchanger according to the first aspect is characterized in that fins are interposed between the heat radiation plates adjacent to each other with a constant space.

According to a third aspect of the present invention, in the heat exchanger according to the first or second aspect, the heat radiating plate functions as a spacer for keeping a distance between the joint end and the heat radiating plate adjacent to each other. Is characterized by.

According to a fourth aspect of the present invention, in the heat exchanger according to any one of the first to third aspects, the mounting members are arranged on both end sides of the heat radiation plate, respectively.

[0008]

[Operation and effect of the invention]

(Claim 1) The heat generated from the heating element is transmitted to the mounting member and then radiated to the cooling medium via the plurality of heat radiation plates joined to the mounting member. Here, since the heat dissipation plate has a larger cross-sectional area and smaller thermal resistance than the conventional fin material, the heat transferred from the mounting member to each heat dissipation plate is quickly conducted to the end of the heat dissipation plate. To do. As a result, the temperature difference between the heat dissipation plate and the cooling medium can be made large, resulting in good heat transfer efficiency.
The cooling performance can be improved. Further, the heat dissipation plate is joined to the attachment member at the flat joint surface at the joint end. Therefore, since the number of heat radiation plates can be appropriately increased or decreased with respect to the mounting member, it is possible to easily change the size of the heat exchanger according to the required heat radiation performance (cooling performance).

(Claim 2) By arranging the fins between the adjacent heat radiation plates, the heat radiation area is expanded and the heat radiation performance is improved. In this case, the heat transferred from the mounting member to the heat dissipation plate is quickly conducted to the end portion of the heat dissipation plate, so that the joint portion of the fin with the heat dissipation plate is quickly heated to a high temperature. Therefore, a large temperature difference between the fin and the cooling medium can be secured. That is, since excellent heat transfer efficiency is obtained in the heat exchanger as a whole, it is possible to expect an effect of improving the heat dissipation performance corresponding to the expansion of the heat dissipation area of the fin.

According to a third aspect of the present invention, the joint end portion of the heat radiating plate functions as a spacer for keeping the distance between the heat radiating plate and the adjacent heat radiating plate, so that the distance between the heat radiating plates is properly maintained with respect to the mounting member. You can

(Claim 4) By arranging the mounting members on both ends of the heat dissipation plate, as a matter of course, the heating elements can be mounted on the respective mounting members for cooling.

[0012]

Embodiments of the heat exchanger of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a front view of a heat exchanger to which electronic parts are attached. The heat exchanger 1 of the present embodiment is for cooling an electronic component 2 such as a power transistor or an IC with air, and a mounting member 3 to which the electronic component 2 is fixed, and a plurality of heat dissipation members joined to the mounting member 3. The plate 4 and the corrugated fins 5 and the like interposed between the adjacent plates 4 for heat dissipation.

The mounting member 3 is made of a material having excellent thermal conductivity, for example, aluminum, and is provided in a flat plate shape having a front surface 3a and a back surface 3b. The electronic component 2 has a heat radiating plate 2a that radiates the generated heat, and the heat radiating plate 2a is attached in close contact with the surface 3a of the attaching member 3 via a heat conductive grease (not shown) or the like, and the bolt 6 It is fixed to the mounting member 3 by.

The heat radiating plate 4 is made of an aluminum clad material (plate thickness: about 2 mm) whose both surfaces are clad with a brazing material, and both ends 4a and 4b thereof are bent into an L shape. The heat radiating plate 4 is in an upright state with respect to the mounting member 3 by brazing one end 4a (joint end of the present invention) bent into an L shape to the back surface 3b of the mounting member 3. And a plurality of mounting members 3 are arranged at regular intervals in the width direction of the mounting member 3 (left and right direction in FIG. 1).

The corrugated fins 5 are thin aluminum plates (thickness: about 0.08 mm) which are alternately folded back to have a corrugated shape. It is brazed to the surface of the heat dissipation plate 4. This heat exchanger 1 is arranged in a state in which the heat radiating plates 4 and the corrugated fins 5 are alternately stacked on the mounting member 3, and the whole is positioned by a jig (not shown) to be placed in the furnace. Are brazed together. As a result, one end 4a of the heat dissipation plate 4 is joined to the back surface 3b of the mounting member 3 at its flat surface, and each corrugated fin 5 is joined to the front surface of the heat dissipation plate 4 at the folded portion. .

Next, the operation and effect of the heat exchanger 1 of this embodiment will be described. The heat generated by the electronic component 2 is generated by the heat sink 2
It is transmitted from a through the mounting member 3 to each heat dissipation plate 4, and further to each corrugated fin 5. here,
The heat conducted from the mounting member 3 to the heat radiating plate 4 has a larger cross-sectional area and a smaller thermal resistance than the fin material used in the conventional heat exchanger. Conducts rapidly to the end 4b of the. That is, in the heat radiating plate 4, the temperature difference between the one end 4a joined to the mounting member 3 and the other end 4b is small, so that the temperature difference from the air blown to the heat exchanger 1 is reduced. It can be made large in the entire area of the exchanger. That is, the corrugated fins 5 joined to the heat dissipation plate 4
Since heat is efficiently transferred to the whole, corrugated fins 5
Thus, excellent heat transfer efficiency can be exhibited in combination with the effect of expanding the heat dissipation area, and the effect of improving heat dissipation performance corresponding to the expansion of the heat dissipation area of the corrugated fins 5 can be obtained.

Further, in this embodiment, by connecting both end portions 4a and 4b of the heat dissipation plate 4 bent in an L shape to the adjacent heat dissipation plate 4, the air dissipation ducts are formed as a whole in each heat dissipation plate 4. Can be configured. At this time, since both ends 4a and 4b bent into an L shape also function as spacers for keeping a constant distance from the adjacent heat dissipation plate 4, in the brazing process, the stacking direction (horizontal direction in FIG. 1) is increased. It can serve as a jig for determining the amount of compression, and good brazing properties can be obtained.

(Second Embodiment) FIG. 2 is a front view of a heat exchanger 1 showing a second embodiment. The heat exchanger 1 of the present embodiment uses an extruded material for the heat dissipation plate 4, and the joint portion (one end portion 4a) with the mounting member 3 is substantially T-shaped (the other end portion 4b is also the same. Shape). Further, since the extruded material is used for the heat dissipation plate 4, both the mounting member 3 and the corrugated fin 5 are clad materials.

(Third Embodiment) FIG. 3 is a front view of a heat exchanger 1 showing a third embodiment. In the heat exchanger 1 of this embodiment, the mounting member 3 is also arranged on the other end 4b side of the heat dissipation plate 4, and the mounting member 3 is joined to the other end 4b of each heat dissipation plate 4. ing. In this case, the electronic component 2 can be fixed to both the mounting members 3 and cooled.

(Fourth Embodiment) FIG. 4 is a front view of a heat exchanger 1 showing a fourth embodiment. The heat exchanger 1 of this embodiment has a spiral fin 7 interposed between adjacent heat dissipation plates 4. That is, the shape of the fin is not limited to the corrugated fin 5 shown in the first embodiment.

(Fifth Embodiment) FIG. 5 is a front view of a heat exchanger 1 showing a fifth embodiment. The heat exchanger 1 according to the present embodiment has no fin between adjacent heat dissipation plates 4. When the amount of heat generated by the electronic component 2 fixed to the mounting member 3 is small, it is possible to eliminate the need for fins as in this embodiment.

(Sixth Embodiment) FIG. 6 is a side view of a heat exchanger 1 showing a sixth embodiment, and FIG. 7 is a sectional view taken along line AA of FIG.
The heat exchanger 1 of the present embodiment uses a liquid as a cooling medium, and a fluid passage 8 (see FIG. 7) is formed between adjacent heat dissipation plates 4, and the fluid passage 8 is provided at both ends thereof. A pair of tanks 9 that communicate with the fluid passages 8 are arranged, and each tank 9
A pipe 10 for circulating a liquid is attached to each.
In this way, by adding the tank 9 and the pipe 10 to the heat exchanger main body, it can be easily applied even when using a liquid as the cooling medium.

(Seventh Embodiment) FIG. 8 is a perspective view of a heat exchanger 1 showing a seventh embodiment. In the heat exchanger 1 of this embodiment, the length of the heat radiating plate 4 is extended with respect to the mounting member 3, and the ventilation duct 11 is integrally configured at the extended portion. That is, as described in the first embodiment, both ends 4a and 4b of each heat dissipation plate 4 are adjacent to each other.
By extending from the mounting member 3 in the state of being joined to
The ventilation duct 11 can be formed by the entire heat dissipation plate 4.

[Modification] In the above embodiment, the mounting member 3,
Although an aluminum material is used as the material for the heat dissipation plate 4 and the corrugated fins 5, a copper material may be used. For example, in the example shown in FIG. 1, the heat dissipation plate 4 may be made of solder-plated copper material, and the mounting member 3 and the corrugated fins 5 may be made of only copper material. Further, in the example shown in FIG. 2, a copper material can be used for the heat dissipation plate 4, and the mounting member 3 and the corrugated fins 5 can both be solder-plated copper material.

[Brief description of drawings]

FIG. 1 is a front view of a heat exchanger fitted with electronic components (first embodiment).

FIG. 2 is a front view of a heat exchanger (second embodiment).

FIG. 3 is a front view of a heat exchanger fitted with electronic components (third embodiment).

FIG. 4 is a front view of a heat exchanger (fourth embodiment).

FIG. 5 is a front view of a heat exchanger (fifth embodiment).

FIG. 6 is a side view of a heat exchanger (sixth embodiment).

FIG. 7 is a sectional view taken along line AA of FIG. 6 (sixth embodiment).

FIG. 8 is a perspective view of a heat exchanger (seventh embodiment).

FIG. 9 is a front view of a heat exchanger showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 heat exchanger 2 electronic component (heating element) 3 mounting member 3a front surface of mounting member 3b back surface of mounting member 4 heat dissipation plate 4a one end (joint end) 5 corrugated fin (fin) 7 spiral fin ( fin)

Claims (4)

[Claims] 1. A heat exchanger in which a heating element that generates heat upon receiving electricity is fixed, and the heat of the heating element is released to a cooling medium to cool the heating element. A mounting member that is mounted in close contact with each other, and a plurality of flat plate-shaped heat-dissipating plates that are juxtaposed at a constant interval in a substantially upright state with respect to the back surface of the mounting member. The heat radiating plate has a flat joint surface at a joint end portion with the mounting member, and is joined to the back surface of the mounting member at this joint surface. 2. The heat exchanger according to claim 1, wherein fins are interposed between the adjacent heat radiation plates with a constant space therebetween. 3. The heat exchanger according to claim 1, wherein the heat dissipation plate functions as a spacer that keeps a distance between the joint end portion and the adjacent heat dissipation plate. Heat exchanger to. 4. The heat exchanger according to claim 1, wherein the mounting members are arranged on both ends of the heat radiation plate.