JP3494196B2 - Boiling cooling device - Google Patents

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 an IGBT module.

[0002]

2. Description of the Related Art In a conventional boiling cooling device, a vapor refrigerant boiled and vaporized in a refrigerant tank is condensed and liquefied by a radiator and returned to the refrigerant tank. Therefore, in order to efficiently condense the boiling vapor by the radiator. Needs to make the flow of the vapor refrigerant inside the radiator a circulating flow (uniform flow). Therefore, for example, JP-A-5
In the boiling cooling device disclosed in No. 1-39442 or Japanese Utility Model Laid-Open No. 58-135954, a refrigerant tank and a radiator are annularly connected by two pipes in order to form a circulating flow inside the radiator. The structure is adopted.

[0003]

However, in the above structure, two pipes for connecting the refrigerant tank and the radiator are required in addition to the refrigerant tank and the radiator, so that the number of parts is increased and the cost is increased, and the entire apparatus is increased. There was a problem that the physique would become larger. The present invention has been made based on the above circumstances,
It is an object of the present invention to provide a boiling cooling device in which the number of parts is reduced and the size is reduced.

[0004]

According to the first aspect of the present invention, the inside of the connecting portion is divided into the inflow chamber and the outflow chamber by the partition member, and the vapor passage of the refrigerant tank and the heat radiating pipe are formed through the inflow chamber. The condensate passage of the refrigerant tank communicates with the heat dissipation pipe through the communication and the outflow chamber. Therefore, the vapor refrigerant that has been boiled and vaporized by receiving the heat of the heating element in the refrigerant tank flows into the inflow chamber of the connecting portion through the vapor passage provided in the refrigerant tank, and then passes through the inside of the heat dissipation pipe from the inflow chamber. In this case, after being condensed and liquefied and flowing into the outflow chamber of the connecting portion, it is returned from the outflow chamber to the vapor passage through the condensate passage in the refrigerant tank. In this way, the refrigerant flow in the radiator becomes a circulation flow (a uniform flow in which the vapor refrigerant and the condensate do not collide), and the refrigerant can be efficiently condensed. Further, the refrigerant tank and the radiator can be integrally formed by connecting the refrigerant tank and the radiator (radiating tube) with the connecting portion. As a result, unlike the conventional device, it is not necessary to connect the refrigerant tank and the radiator with two pipes, so that the number of parts can be reduced and the cost can be reduced, and the overall size and weight of the device can be reduced. it can.

According to the second aspect of the invention, since the radiator is constructed by laminating a plurality of radiating pipes having the same shape on the connecting portion, the number of radiating pipes to be laminated can be easily changed. Accordingly, by increasing or decreasing the number of heat radiating tubes to be stacked according to the number of heat generating elements attached to the refrigerant tank (that is, the total heat generating amount), it is possible to easily secure the heat radiating capacity corresponding to the total heat generating amount of the heat generating elements. .

According to the third aspect of the present invention, since the bottom surface of the refrigerant passage of the radiating pipe is inclined, the liquefied condensed liquid easily flows through the refrigerant passage from the inflow side communication portion to the outflow side communication portion. As a result, the amount of the condensed liquid accumulated at the bottom of the refrigerant passage is reduced, and the vapor refrigerant can be condensed efficiently.

According to the fourth aspect of the present invention, by using the extruded material in the refrigerant tank, the extruded material is cut into an appropriate length according to the number and types of heating elements attached to the refrigerant tank before use. be able to. Therefore, various refrigerant tanks can be easily manufactured at low cost depending on the number and types of heating elements.

According to the fifth aspect of the present invention, the refrigerant circulating flow in the apparatus can be easily formed by bringing the partition member of the connecting portion into contact with the partition wall of the refrigerant tank. That is, the vapor refrigerant that has boiled in the refrigerant tank is a refrigerant tank (steam passage) → connecting portion (inflow chamber) → radiator (inflow side communicating portion → refrigerant passage → outflow side communicating portion) → connecting portion (outflow chamber) → refrigerant From the tank (condensate passage),
It returns to the refrigerant tank (steam passage) again.

According to the invention of claim 6, since the partition member for partitioning the inside of the connecting portion is a plate-shaped member, it can be integrally formed by press working, and the partition member can be manufactured at low cost. Further, by joining the partition member made of the plate-shaped member to the inner peripheral surface of the connecting portion by brazing, the gap between the partition member and the connecting portion can be filled with the brazing material, so that even the plate-shaped partition member can be used. The inside of the connecting portion can be airtightly partitioned.

According to the invention of claim 7, the partition member is provided with the extended portion extending along the inner wall surface of the connecting portion, so that the partition member can be fixed when the partition member is fixed inside the connecting portion. The member can be easily positioned without falling. Further, when joining the partition member inside the connecting portion, since the joining length can be secured by the extended portion, the joining strength is improved, and
Airtightness between the inflow chamber side and the outflow chamber side can be secured. Alternatively, since the extending portion is pressed against the inner wall surface of the connecting portion by mounting the partition member inside the connecting portion in a press-fitted state, airtightness can be maintained without joining the extending portion to the connecting portion. .

According to the invention of claim 8, since the partition member is integrally formed by press molding with the thin plate material forming the connecting portion, it is not necessary to position the partition member with respect to the connecting portion, and the number of parts is reduced. The reduction can reduce the number of manufacturing steps.

According to the ninth aspect of the present invention, since the heating element is mounted inside the vapor passage of the refrigerant tank, the heat resistance can be made smaller than when the heating element is mounted outside the refrigerant tank, and the cooling efficiency is improved. To do. In particular, it is advantageous in the case of a heating element that generates a large amount of heat per unit area.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a boiling cooling device of the present invention will be described with reference to the drawings. (First Embodiment) FIG. 1 is a front view including a partial cross section of a boiling cooling device. The boiling cooling device 1 of the present embodiment cools the heating element 2 by boiling / condensation heat transfer of the refrigerant. The refrigerant tank 3 contains a fluorocarbon-based refrigerant therein, and the vapor refrigerant boiled to vaporize in the refrigerant tank 3. 4 that radiates the heat of the radiator and a cooling fan 5 that blows air to the radiator 4 (see FIG. 3)
Composed of.

The heating element 2 constitutes, for example, an inverter circuit (not shown) of an electric vehicle or a general electric power control device.
It is a GBT module. The heating element 2 has a heat radiating plate (not shown) that radiates heat generated by a built-in semiconductor element (not shown), and the heat radiating plate is in close contact with the outer wall surface of the refrigerant tank 3 to tighten the bolt 6. Is fixed to the refrigerant tank 3. In addition, you may interpose a heat conductive grease between the heat sink and the outer wall surface of the refrigerant tank 3.

The refrigerant tank 3 is made of, for example, an extruded material 7 formed by extruding an aluminum block material.
And a cap 8 placed on one open end (lower end in FIG. 1) of the extruded material 7. The extruded material 7 has a thickness width W with respect to the horizontal width and the vertical width of the outer wall surface to which the heating element 2 is attached.
It is provided in a thin flat shape (see FIG. 3), and two spaces penetrating in the longitudinal direction (vertical direction in FIG. 1) are formed. One of the spaces is provided as a steam passage 9 through which the vapor refrigerant that has been boiled and vaporized by receiving the heat of the heating element 2 passes,
As shown in FIG. 2, the extruded material 7 is widely formed in the lateral width direction (left-right direction in FIG. 2) corresponding to the mounting portion of the heating element 2 mounted in the refrigerant tank 3. The other space is provided as a condensate passage 10 through which the condensate liquefied by the radiator 4 passes, and is formed parallel to the one space at a position deviated from the attachment site of the heating element 2.

The cap 8 is made of the same aluminum as the extruded material 7, and is covered on the outer periphery of the lower end of the extruded material 7 and joined by integral brazing. However, the cap 8 is not in a state of being in close contact with the lower end surface of the extruded material 7, but is covered in a state in which a certain gap is secured between the cap 8 and the lower end surface of the extruded material 7. A communication passage 11 that connects the passage 9 and the condensate passage 10 is formed.

The radiator 4 is a so-called drone cup type heat exchanger, and is constructed by laminating a connecting portion 12 and a plurality of heat radiating tubes 13, and between the heat radiating tubes 13 and between the connecting portions 12 and the heat radiating tube 13. The fins 14 for heat dissipation are interposed between the inner fins 15 (see FIG. 3) inside each heat dissipation pipe 13.
Has been inserted. The connecting portion 12 connects the heat radiating pipe 13 and the coolant tank 3, and has two molded plates 16 and 17 (for example, plates made of aluminum) having good thermal conductivity.
The outer peripheral edge portions of the above are joined to form a hollow shape, and the connection port 16a formed in one of the molding plates 16 is fitted to the upper end outer peripheral portion of the refrigerant tank 3 and is assembled to the upper portion of the refrigerant tank 3. .

The inside of the connecting portion 12 is partitioned by a separator 18 (a partition member of the present invention) into an inflow chamber 19 leading to the vapor passage 9 of the extruded material 7 and an outflow chamber 20 leading to the condensate passage 10. Also, on the other molding plate 17,
Inflow side communication port 17a opening to inflow chamber 19 and outflow chamber 20
The outlet side communication port 17b that opens to the bottom is opened. As shown in FIG. 1, the separator 18 is a plate-shaped member formed in a U-shaped cross section, and the inside of the connecting portion 12 is provided in the inflow chamber 1.
The partition wall portion 18a is divided into the 9 side and the outflow chamber 20 side, and the extending portion 18b extending from the peripheral edge of the partition wall portion 18a along the inner wall surface of the connecting portion 12 is provided.
The outer surface of the is joined (brazed) to the inner wall surface of the connecting portion 12.

The heat radiating pipe 13 is formed in a hollow shape by joining the outer peripheral edge portions of two molding plates 21 having good thermal conductivity like the connecting portion 12, and the entire central portion thereof has a flat refrigerant passage. 22 and both ends of the refrigerant passage 22 (left and right ends in FIG. 1)
A communication portion 23 that communicates with each of the other heat radiating pipes 13 is provided. The two molding plates 21 are provided in the same shape by press molding, and the communication ports 23a are opened at both ends of the communication portion 23. Each radiating pipe 13
As shown in FIG. 1, the communication parts 23 are stacked above each other so that the communication parts 23 are aligned with each other, and the refrigerant passages 22 communicate with each other through the communication ports 23 a that open to the communication parts 23. It communicates with the inflow chamber 19 through the open inflow side communication port 17a, and communicates with the outflow chamber 20 through the outflow side communication port 17b.

The heat dissipating fins 14 are corrugated fins formed by corrugating a thin plate made of aluminum, and have a connecting portion 12
And the heat radiating pipes 13 and between the stacked heat radiating pipes 13 are interposed in the air blowing space. The inner fins 15 are corrugated fins similar to the heat radiating fins 14 and are inserted into the refrigerant passages 22 of the respective heat radiating pipes 13 (see FIG. 3). The cooling fan 5 is, for example, an axial flow fan and is arranged in front of the radiator 4 as shown in FIG.
It is fixed to the radiator 4 via a fan shroud 5a. This boil cooling device 1 is temporarily assembled after the entire assembly.
It is joined by brazing. However, radiator 4
Is the heat radiating pipe 1 from the side of the communicating portion 23 communicating with the inflow chamber 19 of the connecting portion 12 toward the side of the communicating portion 23 communicating with the outflow chamber 20.
The bottom surface of the refrigerant passage 22 of No. 3 is inclined downward (inclination angle θ) and assembled in the refrigerant tank 3 (see FIG. 1).

Next, the operation of this embodiment will be described. The refrigerant that has boiled due to the heat generated from the heat generating element 2 becomes bubbles and rises in the vapor passage 9 and flows into the inflow chamber 19 of the connecting portion 12, and then one of the radiating pipes 13 that communicate with the inflow chamber 19 From the communication part 23 (the communication part 23 on the right side in FIG. 1) to the refrigerant passage 22. The vapor refrigerant flowing through the refrigerant passage 22 receives the air blown from the cooling fan 5 and has a low temperature.
On the inner wall surface of the inner fin 15 and on the surface of the inner fin 15 to be liquefied to form droplets, which flow under the weight of the refrigerant passage 22 and flow from the other communicating portion 23 to the connecting portion 12 of each radiating pipe 13.
Into the outflow chamber 20. Further, the condensate that has flowed from the outflow chamber 20 through the condensate passage 10 of the refrigerant tank 3 flows back into the vapor passage 9 through the communication passage 11 formed by the cap 8. On the other hand, the latent heat of condensation released when the vapor refrigerant is condensed is transmitted from the wall surface of the heat dissipation pipe 13 forming the refrigerant passage 22 to the heat dissipation fins 14 and released to the atmosphere. The boiling and condensation heat transfer of the refrigerant is repeated, and the heat transferred from the heating element 2 is sequentially released to the atmosphere, whereby the semiconductor element is cooled.

(Effect of the First Embodiment) In the boiling cooling device 1 of the present embodiment, the refrigerant tank 3 and the radiator 4 constitute a circulation path through which the refrigerant circulates. , One side of the refrigerant passage 22 of each radiating pipe 13 (the inflow chamber 1 of the connecting portion 12
It is possible to uniformly flow (i.e., a circulating flow) from the communication portion 23 side communicating with 9 to the other side (the communication portion 23 side communicating with the outflow chamber 20 of the coupling portion 12). As a result, the refrigerant can be efficiently condensed without colliding with the vapor refrigerant and the condensed liquid in the radiator 4, so that the heat dissipation performance is improved. Further, in the present embodiment, the connecting portion 1 provided on the radiator 4
By connecting the coolant tank 3 and the heat dissipation pipe 13 by means of 2, the coolant tank 3 and the radiator 4 can be integrally formed. As a result, unlike the conventional device, it is not necessary to connect the refrigerant tank 3 and the radiator 4 with two pipes, so that the number of parts can be reduced and the cost can be reduced, and the overall size and weight of the device can be reduced. Can be realized.

Since the radiator 4 is constructed by laminating a plurality of radiating pipes 13 having the same shape on the connecting portion 12, the number of radiating pipes 13 to be laminated can be easily changed. Therefore, by increasing or decreasing the number of heat radiation pipes 13 to be stacked according to the number of the heating elements 2 attached to the refrigerant tank 3 (that is, the total heating value), the heat radiation capacity corresponding to the total heating value of the heating elements 2 can be obtained. It can be easily secured. Further, since the bottom surface of the refrigerant passage 22 is inclined, the condensate flowing through the refrigerant passage 22 of each radiating pipe 13 goes from the communication portion 23 side communicating with the inflow chamber 19 to the communication portion 23 side communicating with the outflow chamber 20. It becomes easier to flow. Therefore, the amount of the condensed liquid accumulated on the bottom surface of the refrigerant passage 22 is reduced, and the vapor refrigerant can be condensed efficiently.

The separator 18 for partitioning the inside of the connecting portion 12 into the inflow chamber 19 side and the outflow chamber 20 side is integrally formed by forming an extending portion 18b at the peripheral edge of the partition wall portion 18a to form a cup shape as a whole. The separator 18 does not fall inside the connecting portion 12 until the separator 18 is joined by brazing, and the separator 18 can be easily positioned. Further, when joining the separator 18 inside the connecting portion 12, since the joining length (brazing length) can be secured by the extended portion 18b, high joining strength can be obtained, and the inflow chamber 19 side and the outflow chamber side can be obtained. Sufficient air tightness with the 20 side can be secured. Alternatively, when the separator 18 is attached inside the connecting portion 12 in a press-fitted state, the extension portion 1
Since 8b is pressed against the inner wall surface of the connecting portion 12, the extending portion 1
The airtightness can be maintained without joining 8b to the connecting portion 12. Since the cooling medium tank 3 is configured by covering the lower end outer peripheral portion of the extruded material 7 with the cap 8, the extruded material 7 has an appropriate length according to the number and types of the heating elements 2 attached to the cooling medium tank 3. It can be cut and used. Therefore, the heating element 2
Various refrigerant tanks 3 can be easily manufactured at low cost according to the number and type of the refrigerant.

(Second Embodiment) FIG. 4 is a front view including a partial cross section of the boiling cooling apparatus 1. This embodiment shows an example in which the inner fins 24 are inserted in the vapor passage 9 of the refrigerant tank 3. The inner fins 24 are, for example, corrugated fins formed by bending a thin aluminum plate into a corrugated shape. By inserting the inner fins 24 into the steam passage 9, a plurality of passages 9 a can be formed in the steam passage 9 (see FIG. 5). As a result, when the refrigerant that has absorbed the heat of the heat generating element 2 and has boiled rises in the steam passage 9, the steam refrigerant is absorbed by the inner fins 24.
By flowing along each passage 9a formed by
Directionality is imparted to the flow of the vapor refrigerant. That is, the flow of the steam refrigerant is rectified by the inner fins 24 and easily escapes from the steam passage 9. At the same time, the boiling area is increased by using the inner fins 24, so that the heat dissipation performance is improved.

(Third Embodiment) FIG. 6 is a front view including a partial cross section of the boiling cooling apparatus 1. In this embodiment, as shown in FIG. 7, a plurality of ribs 7a are integrally provided on the extruded material 7 that constitutes the refrigerant tank 3, and a plurality of passages 9a are formed in the vapor passage 9 to show an example. is there. Also in this case, the flow of the steam refrigerant flowing through the steam passage 9 can be rectified as in the second embodiment, and the heat dissipation performance can be improved by increasing the effective boiling surface by the rib 7a. Further, it is effective in improving the strength against the positive and negative pressures in the refrigerant tank 3 and preventing the deformation of the mounting surface on which the heating element 2 is mounted.

(Fourth Embodiment) FIG. 8 is a front view including a partial cross section of the boiling cooling apparatus 1. This embodiment shows an example in which the sub-condensate passage 25 is provided in the refrigerant tank 3. The sub-condensate passage 25 is formed on the opposite side of the vapor passage 9 from the condensate passage 10 (the side communicating with the inflow chamber 19 of the connecting portion 12) (see FIG. 9), and the communication passage formed by the cap 8 is formed. 11 communicates with the vapor passage 9 and the condensate passage 10.

The sub-condensate passage 25 is provided, for example, when the boiling cooling device 1 mounted on an electric vehicle is tilted at an angle equal to or more than the tilt angle θ on the side opposite to the tilt direction of the radiator 4 due to the tilt of the vehicle body. It works effectively. That is, the boiling cooling device 1
When the refrigerant passage 22 of the heat radiating pipe 13 is inclined to the opposite side (that is, when the communicating portion 23 side of the connecting portion 12 communicating with the inflow chamber 19 is lower than the communicating portion 23 side communicating with the outflow chamber 20). ), The condensed liquid liquefied in the radiator 4 may return from the inflow chamber 19 to the steam passage 9 again for a short time. At this time, if the sub-condensate passage 25 is provided on the opposite side of the condensate passage 10 with the vapor passage 9 interposed therebetween, the condensate flows into the sub-condensate passage 25 whose opening surface is the lowest when tilted. It is possible to prevent the condensed liquid from returning to the vapor passage 9 and prevent the vapor refrigerant and the condensed liquid from interfering with each other. In addition,
The condensate that has flowed into the sub-condensate passage 25 returns to the vapor passage 9 through the communication passage 11 formed by the cap 8 as it is.

Further, in this embodiment, the radiator 4 is assembled to the refrigerant tank 3 so that the air blowing direction to the radiator 4 is vertical, and the radiator tubes 13 are laminated on both sides of the connecting portion 12, respectively. is doing. In this case, since the width of the entire device is determined by the thickness width of the radiator 4 (width in the left-right direction in FIG. 10), even if the heating elements 2 are attached to both sides of the refrigerant tank 3 as shown in FIG. Advantageously, the width is not increased.

(Fifth Embodiment) FIG. 11 is a front view including a partial cross section of the boiling cooling apparatus 1. The present embodiment shows an example in which the cutout portion 25a is provided so that the opening surface of the sub-condensate passage 25 is lower than the opening surface of the steam passage 9. In this case, when the boiling cooling device 1 is tilted to the opposite side at an angle equal to or larger than the tilt angle θ of the radiator 4 due to some factor (for example, the tilt of the vehicle), the notch 25a is formed on the opening surface of the sub-condensate passage 25. As a result, the condensed liquid easily flows into the sub condensed liquid passage 25. As a result, it is possible to reliably prevent the condensed liquid from returning to the vapor passage 9, and it is possible to prevent interference between the vapor refrigerant and the condensed liquid in the vapor passage 9. It should be noted that not only the sub-condensate passage 25 but also the opening face of the condensate passage 10 may be provided with a similar notch 10a.

(Sixth Embodiment) FIG. 13 is a sectional view of the refrigerant tank 3 (corresponding to the AA section in FIG. 6). This embodiment shows an example in which the vapor passage 9 and the condensate passage 10 of the refrigerant tank 3 are formed by laminating a cutting material and a flat plate. The coolant tank 3 does not necessarily need to use the extruded material 7, and as shown in FIG. 13, a cutting material 26 in which a plurality of recesses are formed by cutting, and the cutting material 26 is attached to close each recess. Accordingly, it may be formed by the flat plate 27 forming the vapor passage 9 and the condensate passage 10. In addition to this, it is also possible to form, for example, two press-formed thin-walled members by bonding.

(Seventh Embodiment) FIG. 14 is a front view of the boiling cooling apparatus 1. In the present embodiment, as in the fourth embodiment, the connecting portion 1 is arranged so that the air blowing direction with respect to the radiator 4 is vertical.
Another example of the case where the radiator 4 is assembled with respect to 2 is shown. The coolant tank 3 is composed of, for example, an extruded material 7 formed by extruding an aluminum block material, and a cap 8 that covers one open end (lower end in FIG. 14) of the extruded material 7.

The extruded material 7 has a vapor passage 9 and a condensate passage 1 which are partitioned by a plurality of vertically extending columns 7b.
0 and sub-condensate passages 25 are provided. The steam passage 9 is a passage through which the vapor refrigerant that has been boiled and vaporized by receiving the heat of the heating element 2 flows out, and a plurality of steam passages 9 are formed in correspondence with the mounting portions of the heating element 2. The condensate passage 10 is a passage through which the liquid refrigerant condensed and liquefied by the radiator 4 flows, and is formed at a position deviated from the attachment site of the heating element 2. Sub condensate passage 2
5 is provided on the opposite side of the condensate passage 10 during the extrusion process and is not normally used as the condensate passage 10. In addition, the vapor passage 9, the condensate passage 10, and the sub-condensate passage 25 are opened at a position lower than the upper end surface of the extruded material 7 by removing the upper ends of the columns 7b.
Each strut 7b is formed with a plurality of screw holes 7c for tightening bolts.

The cap 8 is made of the same aluminum as the extruded material 7, and is covered on the outer peripheral portion of the lower end of the extruded material 7 and joined by integral brazing. However, between the cap 8 and the lower end surface of the extruded material 7, a steam passage 9 formed in the extruded material 7,
A communication passage 11 that connects the condensate passage 10 and the sub-condensate passage 25 is formed. As a result, the liquid refrigerant flowing from the radiator 4 into the condensate passage 10 is transferred to the communication passage 1
Can be supplied to each steam passage 9 through 1.

The connecting portion 12 is formed by joining the outer peripheral edge portions except the lower end side of two press-molded oval-shaped forming plates 120 (the thin plate material of the present invention, see FIG. 16). One communication portion 121 that communicates with the vapor passage 9 of the refrigerant tank 3 and the other communication portion 122 that communicates with the condensate passage 10 are provided at both ends in the direction. The lower end side of the connecting portion 12 serves as a connection port 123 with the refrigerant tank 3, and is fitted to the outer peripheral portion of the upper end of the refrigerant tank 3 and hermetically joined (see FIG. 15). Further, the inside of the connecting portion 12 is provided with the separator 18 (see FIG. 14) arranged at a position near the other communicating portion 122, so that the inflow chamber side including the one communicating portion 121 and the other communicating portion 122.
It is divided into the outflow chamber side including.

The separator 18 has a partition wall portion 18a for partitioning the inside of the connecting portion 12 into an inflow chamber side and an outflow chamber side, and an extended wall portion 18 extending vertically from one side of the partition wall portion 18a.
17 (a), as shown in FIG. 17 (a), the outer peripheral edge portion of each plate is press-molded into an outer shape corresponding to the inner peripheral shape of the connecting portion 12 formed by the two molding plates 120. It is brazed to the inner wall surface of 120. Further, the lower end side of the separator 18 is, as shown in FIG. 18, a column 7b for partitioning between the condensate passage 10 and the vapor passage 9 of the refrigerant tank.
, And both are airtightly joined by brazing. In addition, in the present embodiment, the opening surfaces of the condensate passage 10 and the vapor passage 9 are lowered by removing the upper ends of the columns 7b, but it is not always necessary to remove, and in that case, FIG. As shown, the lower end surface of the separator 18 may be brought into contact with the upper end surface of the column 7b, and the both may be joined by brazing.

As shown in FIG. 16 (a), the molding plate 120 is provided with recesses 124 (recessed from the inside to the outside of the molding plate 120) at both ends in the longitudinal direction.
Communication ports 125 and 126 (round holes punched at the time of pressing) are formed in each of the recesses 124. Each recess 12
4 is provided in an elliptical shape that is long in the up-down direction of the forming plate 120, and when two forming plates 120 are joined to form the connecting portion 12, one communicating portion 121 and the other communicating portion 122 are formed. . However, each molding plate 120
Has a communication port 125 provided in one communication portion 121 opened near the upper part of a recess 124 having a substantially elliptical shape, and a communication port 126 provided in the other communication portion 122 has a recess portion 124 having a substantially elliptical shape. It is opened near the bottom. That is, in the vertical direction of the molding plate 120,
The communication port 125 is opened at a position higher than the communication port 126. In addition, each molding plate 120 has a communication port 1
Ribs 127 having an arc shape are provided on the lower portion of 25 and the upper portion of the communication port 126, respectively. This rib 127
It is provided as a reinforcement for ensuring the strength of the recess 124.

Inside the connecting portion 12, a plurality of inner fins 28 are inserted between the separator 18 and one communicating portion 121 (inflow chamber). As shown in FIG. 14, each inner fin 28 is supported by a plurality of positioning ribs 128 provided on the molding plate 120. However, the inner fins 28 are arranged in the longitudinal direction of the connecting portion 12 so that the vapor refrigerant flowing out from the vapor passage 9 of the refrigerant tank 3 can flow to the one communicating portion 121, and the inner fins 28 are also arranged. A gap is secured between them. It is needless to say that the inner fin 28 is not always necessary, and as shown in FIG. 20, the inner fin 28 may be omitted. In this case, of course, the positioning rib 128 that supports the inner fin 28
Need not be provided.

The radiator 4 is a so-called drone cup type heat exchanger and is constructed by laminating a plurality of flat radiator tubes 13. The radiating pipe 13 is provided in the hollow body by joining two press-formed plates 21 having an oval shape to each other at their outer peripheral edge portions, and has a communication port (punched at the time of pressing) at both ends in the longitudinal direction. An inflow side communication part having a round hole / not shown) and an outflow side communication part (both not shown) are provided, and a flat refrigerant passage (not shown) between the inflow side communication part and the outflow side communication part. Is configured as. An inner fin 15 (see FIG. 15) formed by corrugating a thin aluminum plate is inserted into the refrigerant passage.

As shown in FIG. 15, a plurality of radiating pipes 13 are laminated on both sides of the connecting portion 12 and communicate with each other through the communicating ports. Also, the connecting portion 1
The radiation pipe 13 and the connecting portion 12 connected to the
The communication ports 125 and 126 formed in 2 and the communication port formed in the heat dissipation pipe 13 communicate with each other. Therefore, the radiator 4 is attached in an inclined state so that the inflow side communication portion of each heat radiation pipe 13 is higher than the outflow side communication portion with respect to the coupling portion 12 (FIG. 14).
reference). In addition, a flat space formed between the heat radiation tubes 13 adjacent to each other in the stacking direction, the connecting portion 12 and the radiator 4
Aluminum radiating fins 14 are respectively interposed in the flat spaces formed between the radiating pipes 13 (see FIG. 15). The cooling fan (not shown) blows air to the radiator 4, and is attached above the radiator 4 so that the air blowing direction is perpendicular to the radiator 4.

Next, the operation of this embodiment will be described. The refrigerant that has boiled due to the heat generated from the heating element 2 becomes bubbles and rises in each steam passage 9, and from each steam passage 9 to the connecting portion 1
After flowing into one of the two communicating portions 121, it further flows into the inflow side communicating portion of each heat radiating pipe 13 from one of the communicating portions 121 and is distributed to the refrigerant passage of each heat radiating pipe 13. The vapor refrigerant flowing through each refrigerant passage is condensed and liquefied on the inner wall surface of the refrigerant passage and the surface of the fin inserted in the refrigerant passage, which has a low temperature by the blowing of the cooling fan.

The refrigerant that has been liquefied into liquid droplets flows into the outflow-side communication portion of each radiating pipe 13 while flowing through the bottom surface of the refrigerant passage, and from the outflow-side communication portion to the other communication portion 122 of the connection portion 12. Through which it flows into the condensate passage 10 of the refrigerant tank 3.
The liquid refrigerant flowing down the condensate passage 10 is supplied to each vapor passage 9 again through the communication passage 11 in the cap 8. On the other hand, the latent heat of condensation released when the vapor refrigerant is condensed in the radiator 4 is transferred from the wall surface of the heat radiating pipe 13 forming the refrigerant passage to the heat radiating fins 14 and released into the air blown by the cooling fan. .

(Effect of this embodiment) In this embodiment, since the plate member can be press-molded to manufacture the separator 18,
The manufacturing cost of the separator 18 can be kept low. Further, since the separator 18 made of the plate-like member is joined to the inner peripheral surface of the connecting portion 12 by brazing, the gap between the separator 18 and the connecting portion 12 can be filled with the brazing material, so that the plate-like separator is formed. Even at 18, the inside of the connecting portion 12 can be partitioned airtightly. Further, the two molding plates 120 forming the connecting portion 12 have the same shape, and the mold structure for forming each forming plate 120 is made common, so that the mold cost of the entire connecting portion 12 can be kept low. .

(Eighth Embodiment) FIG. 21 is a side view of the boiling cooling apparatus 1. This embodiment shows an example of a case where each heat dissipation tube 13 that constitutes the radiator 4 is laminated only on one side of the connecting portion 12. In this case, the connecting portion 12 is the radiating pipe 13
A communication port (not shown) is opened only in one molding plate 120A to which the other molding plate 12A is connected.
OB is closed.

(Ninth Embodiment) FIG. 22 is a front view showing the installed state of the boiling cooling apparatus 1, and FIG. 23 is a side view showing the installed state of the boiling cooling apparatus 1. In this embodiment, the boiling cooling device 1
It shows an example in the case of using in a tilted state. As shown in FIG. 22 (a state in which the outflow side communication portion of the heat dissipation pipe 13 is higher in the upside-down direction than the inflow side communication portion) or as shown in FIG. If there is, the refrigerant liquid level B does not reach the condensate passage 10 of the refrigerant tank with the regular amount of refrigerant enclosed.
The condensate cannot flow back to the refrigerant tank 3 (condensate passage 10). Therefore, in such a case, the enclosed refrigerant amount may be increased until the refrigerant liquid level A is above the upper end opening surface of the condensate passage 10. Thereby, the condensate can be returned to the refrigerant tank 3 (condensate passage 10), so that the heat dissipation performance can be maintained.

(Tenth Embodiment) FIG. 24 is a longitudinal sectional view of a refrigerant tank, FIG. 25 is a side view of the boiling cooling device 1, and FIG.
FIG. The boiling cooling device 1 of this embodiment is
It shows an example in which the upper portion of the extruded material 7 forming the coolant tank 3 is used as a part of the connecting portion 12.

The refrigerant tank 3 comprises an extruded material 7 formed by extrusion processing, and caps 8 joined to the upper and lower ends of the extruded material 7. As shown in FIG. 24, the extruded material 7 includes a vapor passage 9, a condensate passage 10, and a sub-condensate passage 2 defined by columns 7b extending vertically.
5 is formed so as to penetrate in the longitudinal direction, and the radiator 4 is provided via the connection plate 29 (a component of the connecting portion 12).
An outlet 90 of the vapor passage 9 and an inlet 100 of the condensate passage 10 are opened in a region (region indicated by a broken line E in FIG. 24) to which the (radiation pipe 13) is connected. The inlet 100
As shown in FIG. 24, the outlet 90 and the outlet 90 are provided with a height difference such that the lower end of the opening of the inlet 100 is slightly lower than the lower end of the opening of the outlet 90.

However, the outflow port 90 is the subcondensate passage 25.
The upper part of the column 7b remaining between the two vapor passages 9 and between the vapor passage 9 and the sub-condensate passage 25 (the portion indicated by the broken line F in FIG. 24). It is communicated with each steam passage 9 by being deleted by additional work such as. Further, each of the columns 7b is formed with a screw hole 7c into which the mounting bolt 6 of the heating element 2 is screwed. The sub-condensate passage 25 is formed so as to have a balance with the condensate passage 10 during extrusion processing, and is not normally used as the condensate passage 10. Therefore, it is not always necessary to form the sub-condensate passage 25.

The caps 8 are joined to both ends of the extruded material 7 by integral brazing. However, although the cap 8 on the upper end side closes the upper end opening surface of the extruded material 7, the cap 8 on the lower end side is provided with the vapor passage 9, the condensate passage 10, and the lower end surface of the extruded material 7. The communication passages 11 that communicate with the sub-condensate passages 25 are formed.

The radiator 4 is a so-called drone cup type heat exchanger, and is constituted by laminating a plurality of hollow radiator tubes 13 having the same shape as shown in FIG.
It is connected to the coolant tank 3 via 9. The radiation pipe 13 is
It is composed of two plates 21 each having a substantially rectangular planar shape, and the outer peripheral edge portions of the plates 21 are joined to each other to form a hollow body. The two plates 21 are provided in the same shape by press-molding a metal material (for example, aluminum material) having good thermal conductivity, and the communication ports 30 are opened at both ends.

The heat radiating pipe 13 has a flat central refrigerant passage 130, and the inner fin 1 formed by corrugating a thin aluminum plate is formed in the refrigerant passage 130.
5 is inserted. Further, the inflow side communication portion 3 having the communication ports 30 at both ends of the refrigerant passage 130, respectively.
1 and the outflow side communication portion 32 are provided. Each communication part 3
The reference numerals 1 and 32 are connected to the communication portions 31 and 32 of the other heat radiating pipe 13 through the communication ports 30 to form the tank portion of the radiator 4 as a whole.

As shown in FIG. 26, each of the heat radiation pipes 13 is laminated such that the inflow side communication portions 31 and the outflow side communication portions 32 are laminated together, and the communication ports 30 open to the communication portions 31 and 32. The heat radiation fins 14 are interposed between the stacked heat radiation pipes 13 that communicate with each other through. However, the plate 2 on the outer side of the heat radiating pipe 13 located on the outermost side
1 has no communication port 30. Alternatively, even when the plate 21 having the communication port 30 opened is used, the communication port 30 is provided from the outside of the plate 21 with an end plate (not shown) or the like.
May be closed.

As shown in FIG. 26, the connection plate 29 covers the inflow port 100 and the outflow port 90 formed in the extruded material 7 and is airtightly joined to the outer wall surface of the extruded material 7. One of the communication chambers 3 that communicates with the respective steam passages 9 and the sub-condensate passages 25 through the outflow port 90 with the outer wall surface.
3 and the other communication chamber 34 that communicates with the condensate passage 10 through the inflow port 100. The connection plate 29 is provided with a communication port 30 similar to the plate 21, and the communication chambers 33 and 34 are connected through the communication port 30.
And the heat radiation pipes 13 communicate with each other.

Next, the operation of this embodiment will be described. The heat generated from the heat generating element 2 is transferred to the boiling point to form a bubble, and the refrigerant rises in the vapor passage 9 and mainly flows into the one communication chamber 33 from the outlet 90, and then the one communication chamber 33. Flows into one of the tank portions of the radiator 4 (inflow side communication portion 31 on the right side of FIG. 26) and is distributed to the refrigerant passages 130 of each heat radiation pipe 13. The vapor refrigerant flowing through each refrigerant passage 130 is blown by the cooling fan 5 (see FIG. 25) and is condensed on the inner wall surface of the refrigerant passage 130 and the surface of the inner fin 15 which have a low temperature to release condensation latent heat, The droplets flow into the other tank portion of the radiator 4 (the outflow side communication portion 32 on the left side in FIG. 26) while flowing on the bottom surface of the refrigerant passage 130. Further, the condensate that flows from the other tank portion into the other communication chamber 34 and mainly collects in the other communication chamber 34 receives the inflow port 10
After flowing into the condensate passage 10 from 0 and flowing down the condensate passage 10, it is supplied again to the vapor passage 9 through the communication passage 11 in the cap 8. On the other hand, the latent heat of condensation released when the vapor refrigerant is condensed is transmitted from the wall surface of the refrigerant passage 130 to the fins 14 for radiating, and is released to the blast air passing between the radiating pipes 13.

In this embodiment, the upper portion of the extruded material 7 forming the coolant tank 3 is used as a part of the connecting portion 12, so that the connecting portion 12 can be connected to the extruded material 7 with only one connecting plate 29. Can be formed. Further, in the present embodiment, the upper portion of the column 7b for partitioning the vapor passage 9 and the condensate passage 10 of the refrigerant tank 3 can be used as a partitioning member for the connecting portion 12 by leaving it as it is without removing it.

(Eleventh Embodiment) FIG. 27 is a top view of the boiling cooling device 1 including a cross section of the connecting portion 12. In this example,
This is an example of positioning the separator 18 that partitions the inside of the connecting portion 12 into the inflow chamber 19 and the outflow chamber 20. Specifically, as shown in FIG. 27, the connecting portion 12
One of the molding plates 16 (or 1
7) is provided with a protrusion 35, and the separator 1 is attached to the protrusion 35.
The separator 18 can be easily positioned by fitting the holes formed in the extended portions 18b of the eight.

(Twelfth Embodiment) FIG. 28 is a top view of the boiling cooling device 1 including a cross section of the connecting portion 12. In this example,
As shown in FIG. 28, an example is shown in which the separator 18 is provided by press molding integrally with one of the molding plates 16 (or 17) forming the connecting portion 12. In this case, the separator 18 for the connecting portion 12
Not only is positioning unnecessary, but also the number of manufacturing steps can be reduced by reducing the number of parts.

(Thirteenth Embodiment) FIG. 29 shows a boiling cooling device 1.
FIG. 30 is a side view of the boiling cooling device 1. Similar to the first embodiment, the present embodiment shows an example in which the radiator 4 is assembled to the connecting portion 12 so that the direction of air blown to the radiator 4 is horizontal. However, as for each of the molding plates 16 and 17 forming the connecting portion 12, one molding plate 16 arranged on the refrigerant tank 3 side of the other molding plate 17 arranged on the radiator 4 side is shown in FIG. It is formed deep in the vertical direction. The other molded plate 17 may have the same shape as the molded plate 21 forming the heat dissipation pipe 13 of the radiator 4.

Further, the separator 18 for partitioning the inside of the connecting portion 12 into the inflow chamber 19 side and the outflow chamber 20 side is located above the column 7b partitioning the vapor passage 9 and the condensate passage 10 of the refrigerant tank 3. The lower end surface of the separator 18 is joined to the upper end surface of the column 7b, and the upper end surface of the separator 18 is joined to the inner wall surface of the other molding plate 17. In this embodiment,
By forming one molding plate 16 of the connecting portion 12 deep, the inflow chamber 19 in the connecting portion 12 can be formed wide. For this reason, when the vaporized refrigerant that has been boiled and vaporized by receiving the heat of the heating element 2 passes through the inflow chamber 19 and flows to the radiator 4, it smoothly passes through the inflow chamber 19 without being throttled by the inflow chamber 19. It can flow to the radiator 4. This allows
Since the refrigerant is circulated more smoothly, the heat dissipation performance is improved.

(Fourteenth Embodiment) FIG. 31 shows a boiling cooling apparatus 1
FIG. 32 is a side view of the boiling cooling device 1. In this embodiment, the structure of the connecting portion 12 described in the thirteenth embodiment (one molding plate 16 to the other molding plate 17
In addition, the radiator 4 is connected to the refrigerant tank 3 in a tilted state (see FIG. 31). As a result, the liquid refrigerant condensed in the heat radiating pipe 13 easily flows to the condensed liquid passage 10 side of the refrigerant tank 3, so that the amount of the condensed liquid accumulated in the heat radiating pipe 13 is reduced and the vapor refrigerant is efficiently condensed. You can

(Fifteenth Embodiment) FIG. 33 shows a boiling cooling apparatus 1.
FIG. In this embodiment, the one molding plate 16 of the connecting portion 12 shown in the fourteenth embodiment is replaced by two press materials 1.
An example of the case of forming by laminating 6A and 16B is shown.

(Sixteenth Embodiment) FIG. 34 shows a boiling cooling apparatus 1
FIG. 35 is a side sectional view of the boiling cooling device 1. In this embodiment, the heating element 2 is arranged in the vapor passage 9 of the refrigerant tank 3, and is connected to an external circuit (not shown) through an airtight terminal 36 (see FIG. 35) airtightly attached to the wall surface of the refrigerant tank 3. An example of a case where electrical conduction is performed will be shown. The airtight terminal 36 includes an insulating cylinder 36 a to be inserted into a terminal mounting hole formed in the wall surface (made of metal) of the refrigerant tank 3, and the insulating cylinder 36.
The center electrode 36b is inserted through the inner periphery of a. The insulating cylinder 36a insulates between the center electrode 36b and the refrigerant tank 3, and is made of, for example, ceramic having high electric insulation and excellent mechanical strength. The center electrode 36b has one end protruding into the inside of the refrigerant tank 3 (inside the steam passage 9) to be connected to the lead wire 2a of the heating element 2, and the other end protruding to the outside of the refrigerant tank 3 to be connected to the wiring of an external circuit. It Insulation cylinder 36a and refrigerant tank 3
The wall surface, the insulating cylinder 36a, and the center electrode 36b are airtightly joined by brazing. The brazing material used is one capable of directly brazing ceramics and metal, for example, active metal brazing. In this embodiment,
Since the heating element 2 is mounted inside the vapor passage 9 of the refrigerant tank 3, the heat resistance can be made smaller than when the heating element 2 is mounted outside the refrigerant tank 3, and the cooling efficiency is improved. In particular, it is advantageous in the case of the heating element 2 which has a large heat generation amount per unit area.

(Seventeenth Embodiment) FIG. 36 shows a boiling cooling apparatus 1.
FIG. This embodiment shows a modification of the sixteenth embodiment, in which the mounting positions (arrangements) of the plurality of heating elements 2 are appropriately changed. That is, when the steam passage 9 in the refrigerant tank 3 is partitioned by the ribs or the like, the mounting position of the heating element 2 is necessarily limited, but the steam passage 9 is formed wide as in the present embodiment. As a result, the mounting position of the heating element 2 can be freely set within the steam passage 9.

(Eighteenth Embodiment) FIG. 37 is a side view of the boiling cooling device 1 including the cross section of the refrigerant tank 3. In this embodiment, as in the tenth embodiment, the upper portion of the extruded material 7 forming the refrigerant tank 3 is used as a part of the connecting portion 12, and the heating element 2 is used.
Shows an example in which is installed in the vapor passage 9 of the refrigerant tank 3. Therefore, the configuration other than the refrigerant tank 3 is the same as that of the tenth embodiment, and the description thereof is omitted. The coolant tank 3 is
It has a width that can accommodate the heating element 2 inside, and the airtight terminal 36 described in the sixteenth embodiment is attached to the wall surface.

[Brief description of drawings]

FIG. 1 is a front view including a partial cross section of a boiling cooling device (first embodiment).

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a front view including a partial cross section of the boiling cooling device (second embodiment).

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

FIG. 6 is a front view including a partial cross section of the boiling cooling device (third embodiment).

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

FIG. 8 is a front view including a partial cross section of a boiling cooling device (fourth embodiment).

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

10 is a sectional view taken along line BB of FIG.

FIG. 11 is a front view including a partial cross section of a boiling cooling device (fifth embodiment).

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

FIG. 13 is a sectional view of a refrigerant tank (corresponding to the AA section in FIG. 6).
(Sixth embodiment).

FIG. 14 is a front view of a boiling cooling device (seventh embodiment).

FIG. 15 is a side view of a boiling cooling device (seventh embodiment).

FIG. 16 is a plan view (a) and a side view (b) of a forming plate forming a connecting portion (seventh embodiment).

FIG. 17 is a plan view (a) and a side view (b) of a separator (seventh embodiment).

FIG. 18 is a cross-sectional view showing a mounted state of a separator (seventh embodiment).

FIG. 19 is a cross-sectional view showing a mounted state of a separator (seventh embodiment).

FIG. 20 is a front view of a boiling cooling device (seventh embodiment).

FIG. 21 is a side view of a boiling cooling device (eighth embodiment).

FIG. 22 is a front view showing an installed state of a boiling cooling device (ninth embodiment).

FIG. 23 is a side view showing an installed state of a boiling cooling device (ninth embodiment).

FIG. 24 is a vertical sectional view of a refrigerant tank (tenth embodiment).

FIG. 25 is a side view of a boiling cooling device (tenth embodiment).

26 is a cross-sectional view taken along the line DD of FIG. 25 (first
Example 0).

FIG. 27 is a top view of a boiling cooling device including a cross section of a communicating portion (11th embodiment).

FIG. 28 is a top view of a boiling cooling device including a cross section of a communication portion (twelfth embodiment).

FIG. 29 is a front view of a boiling cooling device (thirteenth embodiment).

FIG. 30 is a side view of a boiling cooling device (thirteenth embodiment).

FIG. 31 is a front view of a boiling cooling device (fourteenth embodiment).

FIG. 32 is a side view of a boiling cooling device (fourteenth embodiment).

FIG. 33 is a side view of a boiling cooling device (fifteenth embodiment).

FIG. 34 is a front view of a boiling cooling device (sixteenth embodiment).

FIG. 35 is a side sectional view of a boiling cooling device (sixteenth embodiment).

FIG. 36 is a front view of a boiling cooling device (seventeenth embodiment).

FIG. 37 is a side view of the boiling cooling device including the cross section of the refrigerant tank (eighteenth embodiment).

[Explanation of symbols]

1 boiling cooling system 2 heating element 3 Refrigerant tank 4 radiator 7 Extruded material 7b prop (partition wall) 8 caps 9 steam passage 10 Condensate passage 11 passages 12 Connection 13 Radiant pipe 18 Separator (partitioning member) 18a partition wall 18b extension part 19 Inflow chamber 20 Outflow chamber 22 Refrigerant passage (first to fifth embodiments) 23 Communication 31 Inflow side communication part 32 Outflow side communication section 120 Molded plate (thin plate) 130 Refrigerant passage (10th embodiment)

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeru Kadota 1-1-1, Showa-cho, Kariya city, Aichi Japan Denso Co., Ltd. (56) Reference JP-A-57-152150 (JP, A) JP-A-8- 204075 (JP, A) JP-A-8-78589 (JP, A) Actual development Sho 62-162847 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01L 23/427

Claims (9)

(57) [Claims] 1. A boiling cooling device for cooling a heating element, wherein the heating element is mounted, and a refrigerant tank containing a refrigerant which is vaporized by receiving heat of the heating element is boiled in the refrigerant tank. A radiator that releases the heat of the vaporized vapor refrigerant, and a connecting portion that connects the refrigerant tank and the radiator, wherein the refrigerant tank receives the heat of the heating element and vaporized vapor refrigerant flows out. A vapor passage, a condensate passage into which the condensed liquid liquefied by the radiator flows, and a communication passage that connects the vapor passage and the condensate passage are provided, and the connecting portion is an inflow that communicates the inside to the vapor passage. And a discharge member communicating with the condensate passage, and the radiator comprises a hollow heat dissipation pipe that connects the inlet chamber and the outlet chamber. . 2. The boiling cooling device according to claim 1, wherein the heat radiation pipe includes an inflow-side communication section that communicates with the inflow chamber, an outflow-side communication section that communicates with the outflow chamber, and the inflow-side communication section and the outflow. A refrigerant passage communicating with a side communication portion is provided, and in the radiator, a plurality of the heat radiation pipes having the same shape are stacked in the connection portion, and the inflow communication portions and the outflow ports of each other in the stacking direction. A boil cooling apparatus characterized in that the side communication portions are in communication with each other. 3. The boiling cooling device according to claim 2, wherein in the heat dissipation pipe, a bottom surface of the refrigerant passage is inclined downward from the inflow side communication portion toward the outflow side communication portion. And a boiling cooling device. 4. The boiling cooling device according to any one of claims 1 to 3, wherein the refrigerant tank has an extruded material in which the vapor passage and the condensate passage are integrally formed by extrusion, and the extruded material of the extruded material. A boiling cooling device comprising a cap joined to a lower end portion to form the communication passage. 5. The boiling cooling apparatus according to claim 4, wherein the refrigerant tank has a partition wall separating the vapor passage and the condensate passage, and the partition member is in contact with the partition wall. A boiling cooling device characterized in that 6. The boiling cooling device according to any one of claims 1 to 5, wherein the partition member is a plate-shaped member, and an outer peripheral edge portion thereof is brazed to an inner peripheral surface of the connecting portion. A boiling cooling device characterized by the above. 7. The boil cooling apparatus according to claim 6, wherein the partition member partitions the inside of the connecting portion into the inflow chamber and the outflow chamber, and the peripheral edge of the partition wall portion. A boiling cooling device comprising: an extending portion extending along an inner wall surface of the connecting portion, the extending portion being in contact with the inner wall surface of the connecting portion. 8. The boiling cooling device according to claim 1, wherein the connecting portion is made of a thin plate material, and the partition member is integrally formed with the thin plate material by press molding. Characteristic boiling cooling device. 9. The boiling cooling device according to claim 1, wherein the heating element is mounted in the steam passage.