JPH10284661A - Boiling/cooling device and manufacture therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact inexpensive boiling cooling device which has a simple structure and can prevent interference between vaporized coolant and condensed coolant. SOLUTION: A gastight enclosure 3 consists of an extruded member 6 and a pair of caps 7 for hermetically closing both openings of the extruded member 6. A groove 8 for holding a coolant flow controlling plate 4 is formed on the inner surface of each sidewall 6a of the extruded member 6. The caps 7 are hermetically jointed to both openings of the extruded member 6. The coolant flow controlling plate 4 is made of a metal, such as aluminum and is provided with an opening 4a for flowing vaporized coolant and openings 4b for flowing condensed coolant and both sides thereof are held by the grooves 8 formed on the sides of the extruded member 6. A heating unit is disposed in the center of the surface of the heat-receiving wall 6b of the gastight enclosure 3 and is brought into close contact with the surface of the heat-receiving wall 6 by bolts and fixed thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiling cooling device for cooling a heating element such as a semiconductor element.

[0002]

2. Description of the Related Art As a prior art, Japanese Patent Application Laid-Open No. 57-2041
There is a boiling cooling device described in JP-B-56. As shown in FIG. 17, this device is a sealed container 100 for storing a refrigerant.
A condensing section 120 for liquefying the refrigerant vapor that has been boiled by receiving the heat of the heat generating element 110 is provided on the upper part. In the condensing section 120, an upper gas phase chamber 130 and a lower gas phase chamber 140 are formed, and the upper gas phase chamber 130 and the lower gas phase chamber 140 are formed.
Are provided, and a guide plate 160 for guiding the refrigerant vapor to some of the refrigerant passages 150a is provided in the lower gas phase chamber 140. Accordingly, the plurality of refrigerant passages 150 are divided into a refrigerant vapor passage 150a where the refrigerant vapor rises and a liquid refrigerant passage 150 where the condensate liquid descends.
b, and the interference between the refrigerant vapor and the condensate can be suppressed, thereby improving the cooling efficiency.

[0003]

However, in the above-mentioned conventional apparatus, the structure in which the guide plate 160 is obliquely arranged in the lower gas phase chamber 140 is inevitably complicated, and the size of the heating element 11 cannot be avoided.
The component layout including 0 is greatly restricted by the size of the cooling device. In addition, in the conventional apparatus, since the heating element 110 is used by being immersed in the refrigerant liquid in the sealed container 100, there is a difficulty in manufacturing such that the sealed container 100 and the heating element 110 are integrally formed. Was. In order to solve this, if the heating element 110 and the cooler are formed separately and then combined later, a high flatness is required to reduce the contact thermal resistance of the joint, and the manufacturing process is complicated. become. The present invention has been made based on the above circumstances, and an object of the present invention is to provide a small-sized, low-cost boiling cooling device that can prevent interference between a refrigerant vapor and a condensate with a simple structure. .

[0004]

[Means for Solving the Problems]

According to a first aspect of the present invention, the closed container includes an extruding member provided by extrusion molding, and a pair of lids closing both open surfaces of the extruding member. The holding means is provided as a wall and holds the refrigerant flow control plate on the inner wall surface of the pushing member. In this case, since the side wall surface including the heat receiving wall and the heat radiating wall of the closed container can be integrally molded by the extruding member, the strength of the closed container can be improved, and the flatness of the heat receiving wall surface on which the heating element is attached is also improved. it can. In addition, since the closed container can be configured with a simple structure of simply closing the opening surfaces at both ends of the extruding member with the lid, and the holding member is integrally provided with the extruding member, the refrigerant flow control plate can be held in the closed container. It is extremely easy to manufacture as compared with the conventional apparatus, and the cost can be kept low. Furthermore,
By using an extruding member for the closed container, a boiling cooling device suitable for mass production can be provided.

(Means of Claim 2) A groove as a holding means for holding the refrigerant flow control plate is provided on the inner wall surface of the pushing member so as to extend in the pushing direction. Since this groove can be formed at the same time when the extrusion member is extruded, there is no need to provide a holding means in a separate step from the extrusion. As a result, the manufacturing process can be shortened and the cost can be reduced.

(Means of Claim 3) A protrusion as a holding means for holding the refrigerant flow control plate is provided on the inner wall surface of the pushing member so as to extend in the pushing direction. Since this projection can be formed at the same time when the extrusion member is extruded,
There is no need to provide holding means in a step separate from extrusion. As a result, the manufacturing process can be shortened and the cost can be reduced.

The refrigerant flow control plate has an opening through which refrigerant vapor flows from the lower side to the upper side of the refrigerant flow control plate, and a condensate from the upper side to the lower side of the refrigerant flow control plate. And an opening therefor. In this case, since the flow of the refrigerant can be controlled with a simple configuration in which the refrigerant flow control plate is simply provided with an opening for passing the refrigerant vapor and an opening for passing the condensed liquid, it is simpler than the conventional device. Performance can be improved with a simple structure.

[0008] (Means of the present invention) The opening provided in the refrigerant flow control plate for passing the refrigerant vapor is opened in a region corresponding to the mounting portion of the heating element. In this case, the refrigerant vapor that has been boiled by the heat of the heating element can flow to the upper space in the closed container through the opening that opens to the area corresponding to the mounting part of the heating element. In other words, the provision of the opening for passing the refrigerant vapor in the region where boiling is most active allows the refrigerant vapor to flow smoothly to the upper space and diffuse in all directions, so that the refrigerant is efficiently circulated. The heat radiation performance can be improved.

(Claim 6) The closed container has a gap through which the refrigerant can pass between the inner surface of the lid and the end surface of the refrigerant flow control plate. In this case, the refrigerant diffused in the upper space inside the container and condensed on the inner wall surface of the closed container or the surface of the refrigerant flow control plate (the surface on the side of the heat radiating wall) can be returned to the liquid refrigerant through the above-mentioned gap. It is possible to circulate the inside of the container well without interference between the steam flow and the condensate flow.

(Means of Claim 7) A connecting portion for connecting the heat receiving wall and the heat radiating wall is integrally provided inside the pushing member. The heat dissipation area can be increased by the connecting portion, and heat can be transferred from the heat receiving wall to which the heating element is fixed to the heat radiating wall through the connecting portion, so that the heat radiating performance can be improved. This connecting portion can be formed at the same time as the extrusion member is extruded. In addition, by providing the connecting portion integrally with the heat receiving wall and the heat radiating wall, it is possible to improve the strength of the push-out member (closed container) and also to improve the flatness of each surface of the heat receiving wall and the heat radiating wall.

(Means of Claim 8) The connecting portion is provided through at least a region corresponding to a mounting portion of the heating element. Thereby, the heat radiation area is increased in the region where boiling is most active, and heat can be transferred from the heat receiving wall to the heat radiation wall through the connecting portion, so that the heat radiation performance can be efficiently improved.

(9) The coolant flow control plate is held between the distal end surface of the projection on the heat receiving wall side and the distal end surface of the projection on the heat radiating wall side. A space that is thermally connected to the distal end surface of the projection on the heat radiating wall side, and is defined by the projection on the heat receiving wall side below the refrigerant flow control plate, and the projection on the heat radiating wall side above the refrigerant flow control plate. The partitioned space communicates continuously through a plurality of openings provided in the refrigerant flow control plate. In this case, since the protrusion on the heat receiving wall side and the protrusion on the heat radiating wall side are thermally connected by the refrigerant flow control plate,
The heat radiation area can be increased and the heat of the heating element can be transmitted to the heat receiving wall → the protrusion on the heat receiving wall → the coolant flow control plate → the protrusion on the heat radiating wall → the heat radiating wall, so that the heat radiating performance can be improved. Further, by providing a plurality of protrusions, the strength of the pushing member can be improved, and the flatness of the heat receiving wall and the heat radiating wall can be improved. The protrusion on the heat receiving wall side and the protrusion on the heat radiating wall side are provided so as to extend in the pushing direction of the pushing member, and can be formed at the same time when the pushing member is extruded.

Furthermore, in the present invention, since the coolant flow control plate can be held by the projection on the heat receiving wall side and the projection on the heat radiating wall side, holding means such as the groove described in claim 2 and the projection described in claim 3 are provided. (Accordingly, in the present invention, the protrusion on the heat receiving wall side and the protrusion on the heat radiating wall side also function as holding means for holding the refrigerant flow control plate). The space defined by the protrusions on the heat receiving wall side below the refrigerant flow control plate and the space defined by the protrusions on the heat dissipation wall side above the refrigerant flow control plate are a plurality of spaces provided on the refrigerant flow control plate. Through the opening. Therefore, the refrigerant vapor boiling due to the heat of the heating element can diffuse through the openings of the refrigerant flow control plate into the inside of the container in all directions, so that the provision of the plurality of protrusions impedes the flow of the refrigerant vapor. Never.

(Means of Claim 10) The pushing member includes:
A heat dissipation block is provided integrally with the heat dissipation wall. In this case, since the contact thermal resistance between the heat radiating wall and the heat radiating block can be eliminated, the heat radiating performance can be improved. In addition, since it is not necessary to fix the heat radiating block to the heat radiating wall by fasteners such as screws or means such as bonding, the cost can be reduced accordingly.

(Means of Claim 11) The closed container is manufactured by integral brazing. In this case, the closed container is composed of a push-out member and a pair of lids, and has a simple structure in which the refrigerant flow control plate is simply arranged inside the container. Can be manufactured. It is needless to say that the extruding member (including the heat radiating block in the case of claim 10), the lid, and the refrigerant flow control plate forming the closed container are formed of a brazable material (for example, aluminum). .

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a cooling apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of the boiling cooling device. The boiling cooling device 1 of the present embodiment cools a heating element 2 having a semiconductor element used for a mobile terminal, for example, and includes a closed container 3 in which a refrigerant R is sealed, and is disposed in the closed container 3. Refrigerant flow control plate 4 and closed vessel 3
Radiation block 5 attached to one surface (radiation surface)
(See FIG. 3).

As shown in FIG. 1, the closed container 3 comprises an extruding member 6 having both open end faces, and a pair of caps 7 for hermetically closing both open end faces of the extruding member 6. The extruding member 6 is a member that constitutes four wall surfaces of the closed container 3,
It is formed by extruding a metal material such as aluminum having excellent thermal conductivity and cutting it into a predetermined length L. The extruding member 6 is formed in a rectangular box shape having a flat cross section (having a large width in height with respect to the height).
Grooves 8 extending along the extrusion direction are formed on the inner surfaces of a (side walls corresponding to the short sides of the rectangle). The grooves 8 are provided at opposing positions on both side walls 6a, and are formed simultaneously during extrusion molding. As shown in FIG. 2, the cap 7 covers the outer periphery of both ends of the extruding member 6 in the longitudinal direction (extrusion direction) and is hermetically bonded.
The cap 7 is not a simple flat plate member, but is formed into a shape having a bulge outward by press working.

The refrigerant flow control plate 4 is provided with an opening 4a for passing refrigerant vapor and an opening 4b for passing condensed liquid through a metal plate such as aluminum. It is held inside the closed container 3 by being inserted into a groove 8 formed on the inner surface of both side walls 6a. The refrigerant flow control plate 4 inside the closed container 3 is held at a position slightly lower than the vertical center inside the closed container 3 (see FIGS. 4 and 5). The openings 4a for passing the refrigerant vapor are provided at substantially the center of the refrigerant flow control plate 4, and the openings 4b for passing the condensed liquid are provided along the both sides of the refrigerant flow control plate 4. ing. This refrigerant flow control plate 4
Is set to such a size that the plate thickness can be inserted into the groove 8 formed in the extruding member 6 and is held by friction so as not to be displaced after the insertion. Further, the width is a size that can be inserted into the groove 8 of the extruding member 6, the length in the longitudinal direction is provided to be substantially the same as or slightly shorter than the length of the extruding member 6, and the processing of the openings 4 a and 4 b is performed. And is formed by a single press working. There is no problem even if it is processed by etching or cutting.

The heating element 2 is disposed substantially at the center of the surface of the heat receiving wall 6b (lower side wall of the extruding member 6) of the closed vessel 3, and is fixed to the surface of the heat receiving wall 6b by tightening bolts (not shown). Have been. The heat radiating block 5 is made of metal such as aluminum having excellent thermal conductivity, and is fixed to the entire surface of the heat radiating wall 6c (the upper side wall of the extruding member 6) of the closed container 3 by tightening with bolts or the like (FIG. 3). As the refrigerant R, water, alcohol, ammonia, fluorocarbon, chlorofluorocarbon or the like is used, and the refrigerant R is injected through the refrigerant injection pipe 9 (see FIG. 1) to a position slightly lower than the refrigerant flow control plate 4 held inside the closed container 3. . The refrigerant injection pipe 9 is air-tightly connected by inserting its distal end into an injection port 6d provided through the one side wall 6a of the push-out member 6, and after sealing the refrigerant R, the end is sealed off. You.

Next, the operation of this embodiment will be described. The heat generated from the heating element 2 is transmitted to the refrigerant R sealed in the closed container 3 through the heat receiving wall 6b, and causes the refrigerant R to boil.
However, the heat transmitted from the heating element 2 to the heat receiving wall 6 b is
The farther from the installation site, the lower the temperature,
Refrigerant R in closed container 3 boils mainly in a region (hereinafter, referred to as a boiling region) corresponding to a mounting portion of heating element 2.
The refrigerant vapor that has boiled in the boiling region passes through an opening 4a provided in the center of the refrigerant flow control plate 4 and has a space above the refrigerant flow control plate 4, as indicated by solid arrows in FIGS. (Hereinafter, referred to as an upper space) and diffuses in the upper space in all directions.

The refrigerant vapor flowing in the upper space is mainly condensed and liquefied on the inner wall surface of the heat radiating wall 6c, and flows along the inner wall surface or after dripping onto the surface of the refrigerant flow control plate 4, the refrigerant vapor flows. While flowing, the air flows in the outer peripheral direction inside the closed container 3. 4 and 5, the condensed liquid has a plurality of openings 4b opening along both sides of the refrigerant flow control plate 4, and the inner wall surface of the cap 7 and the refrigerant flow control plate 4. Through the gap S (see FIG. 5) between the end face in the longitudinal direction and the refrigerant flow control plate 4, and is returned to the liquid refrigerant R and supplied again to the boiling region.
Liquefaction). The heat (evaporative latent heat) transmitted from the heating element 2 to the refrigerant R is released as condensed latent heat when the refrigerant vapor condenses, and the condensed latent heat is dissipated by the radiating wall 6 c of the closed container 3.
The heat is transmitted to the whole, and is released from the heat radiating wall 6c to the atmosphere through the heat radiating block 5.

(Effects of the present embodiment) According to the present embodiment, the flow of the refrigerant vapor is controlled by arranging the refrigerant flow control plate 4 in the closed vessel 3 to control the flow of the refrigerant vapor and the flow of the condensate. Can be circulated smoothly with less interference between the fluid and the flow of the condensate. In addition, since the refrigerant vapor boiling due to the heat of the heating element 2 can diffuse in the upper space through the openings 4a of the refrigerant flow control plate 4, the heat can be efficiently diffused to the entire heat radiation surface (heat radiation wall 6c). The heat can be dissipated.
As a result, it is possible to provide a high-performance boiling cooling device 1 having excellent heat radiation performance.

In this embodiment, since the four wall surfaces of the closed container 3 can be integrally molded by the pushing member 6, the strength of the closed container 3 is improved as compared with the case where the closed wall 3 is formed by joining the separate wall surfaces. it can. In addition, since the flatness of the surface of the heat receiving wall 6b, which is the mounting surface of the heating element 2, can be improved by using the extruding member 6 in the closed container 3, the contact thermal resistance between the heating element 2 and the heat receiving wall 6b can be reduced. In this case, there is an advantage that steps such as cutting and polishing of the mounting surface (the surface of the heat receiving wall 6b) can be omitted or reduced. Furthermore, the closed container 3 can be configured with a simple structure in which the opening surfaces of both ends of the pushing member 6 are closed with the caps 7, and the coolant flow control plate 4 can be held in the grooves 8 formed on both side walls 6 a of the pushing member 6. Therefore, it is extremely easy to manufacture compared to the conventional device,
Costs can be kept low. In particular, when the cap 7 and the coolant flow control plate 4 are made of, for example, an aluminum clad material, the whole can be manufactured by integral brazing. Further, since the cap 7 and the refrigerant flow control plate 4 which are components other than the extruding member 6 can be easily formed by press working, the boiling cooling device 1 suitable for mass production can be provided.

In this embodiment, since the cap 7 has a bulge, a gap S for returning the condensed liquid can be provided between the cap 7 and the refrigerant flow control plate 4, and the strength of the cap 7 itself can be improved. There is also an effect that can be done. This improvement in the strength of the cap 7 improves the flatness of the joint surface with the extrusion member 6, so that the airtightness of the sealed container 3 can be improved. It is also advantageous for improving the strength of the closed container 3. The cap 7 may have a simple flat plate shape. However,
In this case, it is necessary to make the length L 'of the refrigerant flow control plate 4 shorter than the length L of the pushing member 6 to secure a gap S between the cap 7 and the condensate.

(Modification of First Embodiment) In the above embodiment,
Although the example in which the heat radiation block 5 is fixed to the surface of the heat radiation wall 6c by tightening bolts or the like has been described, as shown in FIG.
The heat radiation block 5 may be provided integrally with the pushing member 6. In this case, there is an advantage that the heat radiation performance can be improved because the contact heat resistance between the heat radiation wall 6c and the heat radiation block 5 is eliminated. Further, a step for fixing the heat radiation block 5 to the heat radiation wall 6c is not required. In the above embodiment, the groove 8 was formed on the inner wall surface of the pushing member 6 to hold the refrigerant flow control plate 4, but as shown in FIG. Provided, the set of projections 10
The refrigerant flow control plate 4 may be held in the groove 10a formed by the above. In this case, the projection 10 can be formed at the same time when the extrusion member 6 is extruded.

(Second Embodiment) FIG. 8 is an exploded perspective view of the boiling cooling device 1, and FIG. In this embodiment, a columnar rib 11 is provided at the center of the extruding member 6 to divide the inside of the closed container 3 into two parts. This rib 11
As shown in FIG. 9, a groove 11 a is provided over the entire length of the push-out member 6, and is formed on both side surfaces of the rib 11 for holding the refrigerant flow control plate 4. According to this,
The refrigerant flow control plate 4 is also divided into two pieces. However, the two refrigerant flow control plates 4 are provided with openings 4a for passing refrigerant vapor and openings 4b for passing condensate, respectively. Therefore, in this case, there is no functional problem even if the inside of the closed container 3 is made independent of two chambers by using a flat plate member for the cap 7, but it is necessary to separately fill the refrigerant R into the two chambers. As described in the first embodiment, it is preferable that the two chambers be communicated with each other by providing a gap S between each of the refrigerant flow control plates 4 by using the cap 7 bulging outward.

The heat generated from the heating element 2 is transmitted to the refrigerant R sealed in the closed vessel 3 through the heat receiving wall 6b, and causes the refrigerant R to boil. The boiling refrigerant vapor passes through openings 4a provided in the refrigerant flow control plate 4, as shown by solid arrows in FIGS.
Into the upper space, and diffuses in the upper space in all directions. The refrigerant vapor flowing in the upper space is mainly condensed and liquefied on the inner wall surface of the radiating wall 6c, and is pushed by the flow of the refrigerant vapor while traveling along the inner wall surface or after dropping on the surface of the refrigerant flow control plate 4. While flowing, it flows in the outer peripheral direction inside the closed container 3. As shown by broken arrows in FIGS. 10 and 11, the condensed liquid has a plurality of openings 4 b that open along the sides of the refrigerant flow control plate 4, and the inner wall surface of the cap 7 and the refrigerant flow control plate 4. Is dropped below the refrigerant flow control plate 4 through the gap S between the liquid refrigerant R and the liquid refrigerant R, is supplied to the boiling region again, and the above cycle (boiling-condensing-liquefaction) is repeated. Heat transferred from refrigerant 2 to refrigerant R (latent heat of evaporation)
Is released as latent heat of condensation when the refrigerant vapor condenses,
The latent heat of condensation is transmitted to the entire heat radiation wall 6c of the closed container 3,
The heat is released from the heat radiating wall 6c to the atmosphere through the heat radiating block 5.

In this embodiment, since the rib 11 is provided at the center of the pushing member 6, the strength of the closed container 3 can be improved. Further, since the rib 11 can be provided integrally with the extruding member 6 by extrusion molding, heat can be transmitted from the heat receiving wall 6b to which the heating element 2 is attached to the heat radiating wall 6c through the rib 11. Thereby, for example, FIG.
As shown in (2), even when the heating element 2 is used in a posture arranged above the closed container 3, the minimum heat transfer from the heat receiving wall 6b to the heat radiating wall 6c can be ensured by heat transfer through the rib 11. .

(Third Embodiment) FIG. 13 is an exploded perspective view of the boiling cooling device 1, and FIG. In the present embodiment, a plurality of ribs 12 and 13 are provided on the heat receiving wall 6b side and the heat radiating wall 6c side, respectively, and the refrigerant flow control plate 4 is arranged between the ribs 12 and 13 on both sides. As shown in FIG. 13, the extruding member 6 includes a heat receiving wall 6b and a heat radiating wall 6c.
A plurality of ribs 12 extending to the side,
A plurality of ribs 13 extending to the b side are provided at positions shifted from each other. However, the height of the ribs 12 and 13 is
The dimensions are set such that the coolant flow control plate 4 can be inserted between the end faces of the ribs 12 and 13.

The refrigerant flow control plate 4 is provided with a rib 1 on the heat receiving wall 6b side.
2 and the ribs 13 on the side of the heat radiating wall 6c are inserted and held by the ribs 12, 13. Therefore, in the present embodiment, there is no need to provide holding means such as the groove 8 and the protrusion 10 on the inner wall surface of the pushing member 6. The refrigerant flow control plate 4 has a plurality of spaces A defined by ribs 12 on the heat receiving wall 6b side below the refrigerant flow control plate 4.
(See FIG. 15), and the heat radiation wall 6c above the refrigerant flow control plate 4.
A plurality of spaces B (see FIG. 15)
) Are provided.

The heat generated from the heating element 2 is transmitted to the refrigerant R sealed in the closed vessel 3 through the heat receiving wall 6b, and causes the refrigerant R to boil. The boiling refrigerant vapor passes through a plurality of openings 4c provided in the refrigerant flow control plate 4 and radiates heat in the upper space inside the closed vessel 3 (above the refrigerant flow control plate 4 as shown by solid arrows in FIG. The width of the sealed container 3 while meandering the space B defined by the rib 13 on the wall 6c side and the lower space (space A defined by the rib 12 on the heat receiving wall 6b side below the refrigerant flow control plate 4). Direction (left-right direction in FIG. 15)
Spread to At the same time, the refrigerant vapor that has flowed into the upper space inside the closed container 3 diffuses in the upper space as it is in the longitudinal direction of the closed container 3 (see FIG. 16). As a result, the refrigerant vapor diffused in all directions inside the closed container 3 mainly emits the heat radiating wall 6c.
Condensed and liquefied on the inner wall of the
Alternatively, after being dropped on the surface of the refrigerant flow control plate 4, the space between the inner wall surface of the cap 7 and the longitudinal end surface of the refrigerant flow control plate 4 is pushed while being pushed by the flow of the refrigerant vapor, as shown by the dashed arrow in FIG. It is dropped below the coolant flow control plate 4 through the gap S, returned to the liquid coolant R and supplied to the boiling region again, and the above cycle (boiling-condensing-liquefaction) is repeated. The heat (evaporative latent heat) transmitted from the heating element 2 to the refrigerant R is released as condensing latent heat when the refrigerant vapor condenses, and the condensed latent heat is transmitted to the entire heat radiating wall 6c of the closed casing 3, and radiated from the heat radiating wall 6c. Released to the atmosphere through block 5.

In this embodiment, the strength of the sealed container 3 can be improved by providing the extrusion member 6 with the plurality of ribs 12 and 13. Further, since the ribs 12 on the heat receiving wall 6b side and the ribs 13 on the heat radiating wall 6c side can be thermally connected through the refrigerant flow control plate 4, the heat radiating area is increased, and the heat of the heating element 2 is transferred from the heat receiving wall 6b to the heat receiving. The heat can be transmitted from the ribs 12 on the wall 6b side → the refrigerant flow control plate 4 → the ribs 13 on the heat radiation wall 6c → the heat radiation wall 6c, so that the heat radiation performance can be improved. Further, similarly to the case of the second embodiment, even when the heating element 2 is used in a state arranged above the closed vessel 3, heat is transmitted through the ribs 12 and 13 and the refrigerant flow control plate 4 so that heat is transmitted. From the heat receiving wall 6b to the heat radiating wall 6
minimum heat transfer to c. In the present embodiment, since the refrigerant vapor flows on the upper side and the lower side of the refrigerant flow control plate 4, the position of the refrigerant flow control plate 4 is determined by the liquid level of the refrigerant R and the heat radiation wall 6.
It is desirably substantially at the center with c.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a boiling cooling device (first embodiment).

FIG. 2 is a plan view of the closed container.

FIG. 3 is a perspective view of a boiling cooling device.

FIG. 4 is a cross-sectional view of the closed container along line AA.

FIG. 5 is a cross-sectional view of the closed container along a line BB.

FIG. 6 is a sectional view of an extruding member.

FIG. 7 is a sectional view of an extruding member.

FIG. 8 is an exploded perspective view of a boiling cooling device (second embodiment).

FIG. 9 is a plan view of the closed container.

FIG. 10 is a sectional view of the closed container along the line CC.

FIG. 11 is a sectional view of the closed container along the line DD.

FIG. 12 is a sectional view of a closed container (second embodiment).

FIG. 13 is an exploded perspective view of a boiling cooling device (third embodiment).

FIG. 14 is a plan view of a closed container.

FIG. 15 is a cross-sectional view of the closed container along the line EE.

FIG. 16 is a cross-sectional view of the closed container along the line FF.

FIG. 17 is a sectional view of a boiling cooling device (prior art).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Boiling cooling device 2 Heating element 3 Airtight container 4 Refrigerant flow control plate 4a Opening for passing refrigerant vapor 4b Opening for passing condensed liquid 4c Opening 5 Heat dissipation block 6 Extruding member 6b Heat receiving wall 6c Heat dissipation wall 7 Cap (Lid) 8 Groove (holding means) 10 Projection (holding means) 11 Rib (connecting part) 12 Rib (projection) on heat-receiving wall 13 Rib (projection) on heat-dissipation wall R Refrigerant S Gap through which refrigerant can pass

Claims (11)

[Claims] 1. A closed space is formed with a heat receiving wall and a heat radiating wall disposed opposite to each other, and a closed space is formed together with the heat receiving wall and the heat radiating wall.
The closed space is provided with a sealed container in which a predetermined amount of refrigerant is sealed, a heating element is fixed to the surface of the heat receiving wall, and the heat inside the container boils by the heat of the heating element, forming a refrigerant vapor inside the container. A boiling cooling device that condenses and liquefies on the inner wall surface of the heat radiating wall while diffusing the upper space in four directions, and releases condensed latent heat to the outside from the heat radiating wall. Located above,
A refrigerant flow control plate that controls the flow of the refrigerant vapor that has been boiled by receiving the heat of the heating element and the flow of the condensed liquid that has been condensed and liquefied by the refrigerant vapor, wherein the closed container is provided by extrusion molding. And a pair of lids for closing the opening surfaces at both ends of the pushing member. Two opposing wall surfaces of the pushing member are provided as the heat receiving wall and the heat radiating wall, and an inner wall surface of the pushing member. And a holding means for holding the refrigerant flow control plate. 2. The boiling cooling according to claim 1, wherein a groove as holding means for holding the refrigerant flow control plate is provided on the inner wall surface of the pushing member so as to extend in the pushing direction. apparatus. 3. A cooling apparatus according to claim 1, wherein a projection as a holding means for holding said refrigerant flow control plate is provided on an inner wall surface of said pushing member so as to extend in a pushing direction. apparatus. 4. The refrigerant flow control plate has an opening through which refrigerant vapor flows from below to above the refrigerant flow control plate, and a passage through which condensate flows from above to below the refrigerant flow control plate. The boiling cooling device according to any one of claims 1 to 3, further comprising an opening. 5. An apparatus according to claim 4, wherein an opening provided in said refrigerant flow control plate for allowing refrigerant vapor to pass therethrough is opened in a region corresponding to a mounting portion of said heating element. Boiling cooling device. 6. The airtight container according to claim 1, wherein a gap through which a refrigerant can pass is provided between an inner surface of the lid and an end surface of the refrigerant flow control plate. Any of the boiling cooling devices. 7. The boiling member according to claim 1, wherein a connecting portion for connecting the heat receiving wall and the heat radiating wall is integrally provided inside the pushing member. Cooling system. 8. The boiling cooling device according to claim 7, wherein the connecting portion is provided at least through a region corresponding to a mounting portion of the heating element. 9. A plurality of protrusions extending from the heat receiving wall to the heat radiating wall and a plurality of protrusions extending from the heat radiating wall to the heat receiving wall are provided inside the extruding member at positions shifted from each other. The refrigerant flow control plate is held between a distal end surface of the projection on the heat receiving wall side and a distal end surface of the projection on the heat radiating wall side. A space that is thermally connected to a tip end surface of the protrusion, and is defined by the protrusion on the heat receiving wall side below the refrigerant flow control plate, and a protrusion on the heat radiation wall side above the refrigerant flow control plate. The divided space is continuously communicated through a plurality of openings provided in the refrigerant flow control plate.
9. The boiling cooling device according to any one of items 1 to 8. 10. The boiling cooling device according to claim 1, wherein the extruding member is provided with a heat radiation block integrally with the heat radiation wall. 11. A method for manufacturing a boiling cooling device according to claim 1, wherein said closed vessel is manufactured by integral brazing. Method.