JP2003243867A - Boiling cooler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a boiling cooler in which a cooling performance can be improved with the same physique by further smoothing circulation of a refrigerant. <P>SOLUTION: The boiling cooler comprises a refrigerant tank 110 in which the refrigerant is stored therein, a plurality of heating tubes 121 substantially erected and connected to an upper side of the tank 110, and a header 130 for communicating with ends of the plurality of the tubes 121. Thus, when the boiled and vaporized refrigerant by heat of a heater 10 mounted on a lower surface 110a of the tank 110 is returned to the tank 110 from other heating tube 121 via the header 130 from the partial tube 121, the refrigerant is condensed and liquefied by a cooling air supplied from one of the tubes 121, condensed latent heat is discharged to the air to cool the heater 10. The cooler further comprises refrigerant circulation control means 111, 111a provided in the tank 110 for introducing the boiled and vaporized refrigerant to the tube 121 of the leeward side of the air. <P>COPYRIGHT: (C)2003,JPO

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 by transferring boiling heat of a refrigerant.

[0002]

2. Description of the Related Art FIG. 6 shows a boiling cooling device 100 which the present inventor is trial-making and examining. The boiling cooling device 100 includes a refrigerant tank 110 in which a refrigerant is stored and a heat radiating core portion 120.
The heating element 10 is attached to the heat receiving surface 110a below the refrigerant tank 110.

The heat dissipating core portion 120 includes a heat dissipating tube 121.
And a radiation fin 122, and a radiation tube 121.
Is arranged substantially upright with respect to the heat radiation surface 110b of the coolant tank 110 so that the coolant tank 110 and the header 130 communicate with each other.

As shown in FIG. 7, the refrigerant stored in the refrigerant tank 110 receives the heat of the heating element 10 to be boiled to vaporize, mainly from the heat radiation tube 121 near the heating element 10 to the header 130.
Flows into the inside of the heat dissipation tube 121 outside the area of the heat generating body 10 and condenses due to heat exchange with the cooling air blown from one side of the heat dissipation core part 120 to become a condensed liquid from the header 130 as a refrigerant. Reflux to the bath 110. Thereby, the heat generated from the heating element 10 is transferred to the refrigerant,
The heat-dissipating core portion 120 emits the heat to the outside air so that the heating element 10
Is cooled.

[0005]

In recent years, the amount of heat generated by the heating element 10 has been increasing, and there is an increasing need for improving the cooling performance of the boiling cooling device. On the other hand, by enlarging the heat dissipation core part 120 of the boiling cooling device 100,
Although it can be provided, it cannot be simply handled due to restrictions in mounting on the counterpart device having the heating element 10.

Then, the present inventor reconsidered by focusing on the flow of the refrigerant involved in the basic principle for cooling the heating element 10, and the following facts became clear. That is, in the boiling cooling device 100, the temperature of the cooling air blown from one side rises from the windward side to the leeward side due to heat exchange with the refrigerant, so that the refrigerant condensing capacity on the leeward side decreases. . Further, since the evaporated refrigerant vapor is condensed to some extent by the cooling air in the central portion, the flow resistance increases for the vaporized refrigerant that is about to rise, and the circulation of the refrigerant in the boiling cooling device 100 is generally smooth. It turns out that it has not been done. In other words, it was found that there is room for improving the cooling performance by improving this part.

In view of the above problems, it is an object of the present invention to provide a boiling cooling device which makes it possible to further smoothly circulate the refrigerant and to improve the cooling performance with the same size.

[0008]

The present invention employs the following technical means in order to achieve the above object.

According to the first aspect of the present invention, the refrigerant tank (110) in which the refrigerant is stored, and the plurality of heat radiation tubes (12) connected substantially upright to the upper side of the refrigerant tank (110).
1) and a header (130) for communicating the ends of the plurality of heat dissipation tubes (121) with each other, and the refrigerant tank (110)
A part of the heat radiating tube (1) is the refrigerant that is boiled and vaporized by receiving the heat of the heating element (10) attached to the lower surface (110a) of the
21) through the header (130) and from the other heat dissipation tube (121) back to the refrigerant tank (110), it is condensed and liquefied by the cooling air blown from one of the plurality of heat dissipation tubes (121). A cooling device for cooling a heating element (10) by releasing the latent heat of condensation to the cooling air at the time, wherein a heat-radiating tube is provided in the refrigerant tank (110) where the boiled vaporized refrigerant is on the lee side of the cooling air. It is characterized in that a refrigerant circulation control means (111, 111a) for flowing into (121) is provided.

As a result, the boiling vaporized refrigerant flows into the heat radiation tube (121) on the leeward side, and the header (13)
This heat dissipation tube (12)
In 1), the cooling air, which has already been heat-exchanged from the windward side and whose temperature has risen, passes, so that the condensation of the refrigerant here is suppressed and the flow resistance when the refrigerant rises can be reduced. Also,
When this refrigerant returns from the header (130) to the refrigerant tank (110), the heat radiating tube (1) located on the upwind side of the cooling air.
21), and the cooling air having a low temperature before heat exchange accelerates the condensation and liquefaction of the refrigerant. Generally, the circulation of the refrigerant becomes smoother, and the boiling cooling device (1
It is possible to improve the cooling performance under the same conditions as in (00).

According to the second aspect of the present invention, the refrigerant circulation control means (111) is arranged so as to face the opening (121a) of the heat radiation tube (121) on the windward side of the cooling air. By using the cooling medium circulation control plate (111), the cooling direction can be easily and inexpensively regulated to improve the cooling performance.

Further, as in the third aspect of the present invention, the refrigerant tank (110) is provided with a lower heat receiving plate (112) on the lower surface of which a heating element (10) is attached and a heat radiating plate arranged above it. A plurality of openings (1
14a, 115a, 116a) is formed by stacking a plurality of intermediate plates (114, 115, 116), and the refrigerant circulation control means (111a) serves as a heat dissipation tube (upstream side) of cooling air. 121), the thick portions (115c, 1) between the plurality of openings (115a, 116a) arranged to face each other so as to cover the opening (121a).
16c), the cooling performance can be easily and inexpensively improved similarly to the invention described in claim 2.

According to the fourth aspect of the present invention, the refrigerant tank (110) in which the refrigerant is stored, and the plurality of heat radiation tubes (12) connected substantially upright to the upper side of the refrigerant tank (110).
1) and a header (130) for communicating the ends of the plurality of heat dissipation tubes (121) with each other, and the refrigerant tank (110)
A part of the heat radiating tube (1) is the refrigerant that is boiled and vaporized by receiving the heat of the heating element (10) attached to the lower surface (110a) of the
21) through the header (130) and from the other heat dissipation tube (121) back to the refrigerant tank (110), it is condensed and liquefied by the cooling air blown from one of the plurality of heat dissipation tubes (121). A boiling cooling device for cooling a heating element (10) by discharging latent latent heat of condensation to cooling air, wherein the heating element (10) is a cooling air in a lower surface (110a) of a refrigerant tank (110). It is characterized in that it is attached to a region corresponding to the heat radiation tube (121) on the leeward side.

Thus, the boiling vaporized refrigerant can be made to flow from the adjacent leeward heat radiation tube (121), and like the invention of claim 1, the leeward heat radiation tube (121). The condensation of the refrigerant can be suppressed, and the condensation can be promoted in the heat radiation tube (121) on the windward side, so that the cooling performance can be improved with the same physical constitution.

The reference numerals in the parentheses of the above means indicate the correspondence with the concrete means described in the embodiments described later.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) A first embodiment of a boiling cooling apparatus of the present invention will be described with reference to FIGS. The boiling cooling device 100 cools a heating element 10 such as a semiconductor element, and is composed of a coolant tank 110, a radiating core portion 120, and a header 130. Each member described below is made of aluminum or aluminum alloy. And is brazed integrally with the brazing material applied to the portions to be joined between the respective members.

FIG. 1 is a sectional view of a boiling cooling device 100, and FIG.
FIG. 2 is a view seen from the direction A in FIG. 1. Refrigerant tank 110
Is a container having a flat rectangular parallelepiped shape in the vertical direction, and a predetermined amount of refrigerant is sealed inside. Water, alcohol, fluorocarbon, chlorofluorocarbon, or the like is used as the refrigerant.

The heating element 10 is arranged at the center of the lower heat receiving surface (corresponding to the lower surface in the claims) 110a of the refrigerant tank 110, and is fixed by tightening bolts or the like (not shown). In addition, in order to reduce the contact thermal resistance between the heating element 10 and the heat receiving surface 110a, a heat conductive grease may be interposed therebetween. In addition, a plurality of tube holes 110c into which a heat dissipation tube 121, which will be described later, is inserted are provided on the heat dissipation surface 110b on the upper side of the refrigerant tank 110 in the figure. Inside the coolant tank 110, there is provided a coolant circulation control means (111) which is a feature of the present invention. The details will be described later.

The heat dissipation core portion 120 is composed of a heat dissipation tube 121.
And a radiation fin 122. Heat dissipation tube 121
Is a tube having a flat cross section, and a plurality of tubes are arranged in the long side direction and the short side direction of this cross section. Then, one end of the heat dissipation tube 121 is inserted and brazed into the tube hole 110c of the refrigerant tank 110, and the refrigerant tank 1
It is provided on the upper side of 10 so as to stand upright.

The radiating fins 122 are formed by corrugating a thin plate material and are brazed between the radiating tubes 121 arranged in the short side direction of the cross section among the radiating tubes 121.

The header 130 is a container having a rectangular parallelepiped shape that is flat in the vertical direction like the refrigerant tank 110, and has a tube hole 131 on the lower surface thereof.
The other end of 1 is inserted and brazed. And
The heat dissipation tube 131 allows the coolant tank 110 and the header 13
The insides of 0 are communicated with each other.

The end portion of the heat dissipation tube 121 has a refrigerant tank 110 and a header 130 for the purpose of reducing the flow resistance when the refrigerant flows, reducing the size of the refrigerant tank 110 and the header 130, and preventing the refrigerant from staying in the header 130. It is positioned so that it does not project into the internal space of the.

When the boiling cooling device 100 is operated, one of the plurality of heat radiation tubes 121 (see FIG.
Cooling air is supplied from the left side of the inside) so as to pass through the radiation fins 122.

Next, the essential part of the present invention will be described. A refrigerant circulation control plate (hereinafter referred to as a control plate) 111 as a refrigerant circulation control unit is provided inside the refrigerant tank 110, and the refrigerant boiled and vaporized in the refrigerant tank 110 is connected to a heat dissipation tube 121 on the downstream side of the cooling air. I am trying to make it inflow.

Specifically, the control plate 111 has a heat radiating surface 110 at an intermediate portion in the cooling air flow direction of the refrigerant tank 110.
Radiation tube 1 that hangs from b and becomes the windward side of the cooling air
21 is extended to the 21 side (left side in FIG. 1), and it is arrange | positioned facing so that the opening part 121a of this heat radiation tube 121 of this windward side may be covered. A flow passage 110d is formed between the end of the control plate 111 and the side wall of the coolant tank 110.

The boiling cooling device 10 constructed as described above
At 0, the refrigerant that has been boiled and vaporized by receiving the heat of the heating element 10 attached to the heat receiving surface 110a of the refrigerant tank 110 passes from a part of the heat dissipation tubes 121 to the header 130, and from another heat dissipation tube 121 to the refrigerant tank 110. When returning, the heat generating element 10 is cooled by being condensed and liquefied by the cooling air blown from one of the plurality of heat radiation tubes 121 and discharging the latent heat of condensation at this time to the cooling air.

In the present invention, since the control plate 111 is provided in the refrigerant tank 110 so as to cover the opening 121a of the heat radiation tube 121 on the windward side of the cooling air, the boiling vaporized refrigerant is located on the leeward side of the heat radiation tube 121. When it flows into the inside and rises toward the header 130, the heat dissipation tube 12
The cooling air, which has already undergone heat exchange from the windward side and whose temperature has risen, passes through No. 1, so that the condensation of the refrigerant here is suppressed and the flow resistance when the refrigerant rises can be reduced. Further, when this refrigerant returns from the header 130 to the refrigerant tank 110, it flows through the heat dissipation tube 121 located on the windward side of the cooling air, and the cooling air having a low temperature before heat exchange condenses and liquefies the refrigerant. Be promoted. In general, the circulation of the refrigerant becomes smoother, and the cooling performance can be improved under the same condition of the boil cooling apparatus 100.

The regulation of the refrigerant flow as described above can be easily and inexpensively dealt with by the simple construction of the control plate 111.

(Second Embodiment) A second embodiment of the present invention is shown in FIGS. The second embodiment is different from the first embodiment in that the refrigerant tank 110 is configured by laminating a plurality of plates, and the refrigerant circulation control means (111a) is formed by combining the shapes of the plates. It is a thing.

The refrigerant tank 110 is composed of a heat receiving plate 112 forming a lower surface, a heat radiating plate 113 forming an upper surface, and intermediate plates 114, 115, 116 laminated between the heat receiving plate 112 and the heat radiating plate 113. The whole is brazed together.

As shown in FIG. 4, the heat receiving plate 112.
Is a rectangular flat plate member and corresponds to the heat receiving surface (110a) in the first embodiment, and the heating element 10 is attached thereto.

The heat radiating plate 113 is a rectangular flat plate member similar to the heat receiving plate 112, corresponds to the heat radiating surface (110b) in the first embodiment, and is a tube into which one end of the heat radiating tube 121 is inserted. Hole 113a
Are provided in plural.

The intermediate plate 114 has a plurality of slit-shaped openings 114a formed in a rectangular flat plate member along the lateral direction (horizontal direction in FIG. 4) of the member. A thick portion 114b is formed between adjacent openings 114a.

The intermediate plate 115 is composed of a rectangular flat plate member, and the heat radiating tube 12 is arranged in the flow direction of the cooling air.
The slit-shaped opening 115a is formed in the region located on the leeward side of No. 1 and the position on the most windward side in the longitudinal direction of the member (see FIG.
A plurality of them are formed along the inner vertical direction). Also,
A thick portion 115b is formed between the adjacent openings 115a. A wide thick portion 115c having no opening is formed in a region corresponding to the heat dissipation tube 121 located on the windward side of the cooling air.

Further, in the intermediate plate 116, like the intermediate plate 114, a plurality of slit-shaped openings 116a are formed in a rectangular flat plate member along the lateral direction of the member (left-right direction in FIG. 4). . Also, the adjacent openings 1
A thick portion 116b is formed between 14a.
Then, here, an intermediate thick portion 116c is formed between a region located on the windward side and a region located on the leeward side of the heat dissipation tube 121 in the flow direction of the cooling air.

The intermediate plates 114, 115, 116
The openings 114a, 115a, 116a are formed by cutting, pressing, etching, or the like.

Then, as shown in FIG. 3, the intermediate plate 1
14, 115, and 116 are stacked between the heat receiving plate 112 and the heat radiating plate 113 to form the coolant tank 110, and the openings 114a, 115a, 1
Internal spaces are formed by communicating with each other at positions where 16a intersect.

Further, by the wide wall thickness portion 115c of the intermediate plate 115 and the wall thickness portion 116c of the intermediate plate 116, the wall thickness as a refrigerant circulation control means similar to the control plate 111 described in the first embodiment is obtained. Control plate 111a
Is formed.

As a result, the plurality of plates 112 to 11 are
By stacking 6 sheets, the thick portion control plate 111 can be easily and inexpensively manufactured.
The coolant tank 110 having a can be formed, and the cooling performance of the boiling cooling device 100 can be improved by further smoothing the flow of the coolant as in the first embodiment.

(Third Embodiment) FIG. 5 shows a third embodiment of the present invention. The third embodiment is different from the first embodiment in that the control plate 111 is not provided and the mounting position of the heating element 10 is changed to improve the performance.

Here, the heating element 10 is attached to the heat receiving surface 110a of the refrigerant tank 110 in a region corresponding to the heat radiating tube 121 on the lee side of the cooling air.

As a result, the boiled vaporized refrigerant can be made to flow from the adjacent leeward heat radiation tube 121, and the condensation of the refrigerant in the leeward heat radiation tube 121 can be suppressed as in the first embodiment. Further, the condensation can be promoted in the heat radiation tube 121 on the windward side, and the cooling performance can be improved with the same physical constitution.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is an arrow view from the direction A in FIG.

FIG. 3 is a cross-sectional view showing a second embodiment of the present invention.

FIG. 4 is an exploded perspective view showing the refrigerant tank in FIG.

FIG. 5 is a sectional view showing a third embodiment of the present invention.

FIG. 6 is an external perspective view showing a prototype.

FIG. 7 is a cross-sectional view showing a prototype.

[Explanation of symbols]

10 heating element 100 boiling cooling system 110 Refrigerant tank 110a Heat receiving surface (bottom surface) 111 Refrigerant circulation control plate (refrigerant circulation control means) 111a Thick part control plate (refrigerant circulation control means) 112 Heat receiving plate 113 Heat dissipation plate 114, 115, 116 Intermediate plate 114a, 115a, 116a openings 115c Wide wall thickness 116c Middle thickness part 121 Heat dissipation tube 121a opening 130 header

Claims (4)

[Claims] 1. A refrigerant tank (11) in which a refrigerant is stored.
0), a plurality of heat dissipation tubes (121) connected to the upper side of the refrigerant tank (110) substantially upright, and a header (130) for communicating the ends of the plurality of heat dissipation tubes (121). The refrigerant that has been boiled and vaporized by receiving the heat of the heating element (10) attached to the lower surface (110a) of the refrigerant tank (110) is partially transferred from the heat dissipation tube (121) to the header (13).
0), when returning from the other heat radiation tube (121) to the refrigerant tank (110), it is condensed and liquefied by the cooling air blown from one of the plurality of heat radiation tubes (121). A boiling cooling device that cools the heating element (10) by releasing latent heat of condensation to the cooling wind, wherein the boiling vaporized refrigerant is in the leeward side of the cooling wind in the refrigerant tank (110). The heat dissipation tube (121)
A boil cooling apparatus, characterized in that it is provided with a refrigerant circulation control means (111, 111a) for flowing into the. 2. The coolant circulation control means (111) is arranged so as to face the coolant circulation control plate (111) so as to cover the opening (121a) of the heat radiation tube (121) on the upwind side of the cooling wind. The boiling cooling device according to claim 1, wherein 3. A lower heat receiving plate (112) having a lower surface on which a heating element (10) is mounted, in the refrigerant tank (110).
And a plurality of intermediate plates (114, 115, 116) having a plurality of openings (114a, 115a, 116a) between the heat dissipation plate (113) arranged on the upper side thereof.
The cooling medium circulation control means (111a) has an opening (12) of the heat dissipation tube (121) which is on the upwind side of the cooling air.
1a), the thick portions (115c, 116) between the plurality of openings (115a, 116a) arranged so as to face each other.
The boil cooling apparatus according to claim 1, wherein the boil cooling apparatus is formed by c). 4. A refrigerant tank (11) in which a refrigerant is stored.
0), a plurality of heat dissipation tubes (121) connected to the upper side of the refrigerant tank (110) substantially upright, and a header (130) for communicating the ends of the plurality of heat dissipation tubes (121). The refrigerant that has been boiled and vaporized by receiving the heat of the heating element (10) attached to the lower surface (110a) of the refrigerant tank (110) is partially transferred from the heat dissipation tube (121) to the header (13).
0), when returning from the other heat radiation tube (121) to the refrigerant tank (110), it is condensed and liquefied by the cooling air blown from one of the plurality of heat radiation tubes (121). A boiling cooling device for cooling the heating element (10) by releasing latent heat of condensation to the cooling air, wherein the heating element (10) is in a lower surface (110a) of the refrigerant tank (110), A boiling cooling device, characterized in that it is attached to a region corresponding to the radiation tube (121) on the lee side of the cooling wind.