JPH0329181B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention immerses electrical equipment such as a semiconductor stack in a boiling refrigerant in a closed container, and utilizes circulation involving a gas-liquid phase change of the refrigerant. The present invention relates to a boiling refrigerant type cooling device for cooling the electrical equipment. In this type of cooling device, the sealed container is required to be highly airtight to prevent boiling refrigerant from leaking and outside air from entering as much as possible, and to prevent harmful foreign matter from entering the charged parts of the electrical equipment that is housed. is a requirement, and especially in the case of mass production, it is desired that quality control is easy and production costs are low.

[Prior art and its problems]

As this type of boiling refrigerant type cooling device, the one shown in FIGS. 7 and 8 is known. That is, an electric device 6 such as a semiconductor stack which is a heat source is held by appropriate means so as to be completely immersed in a boiling refrigerant 7 stored inside a refrigerant boiling section 1 of a closed container. Lead wires of the electrical equipment 6 are led out to the outside through airtight terminals 5 disposed at appropriate locations in the refrigerant boiling section 1 of the hermetic container. Further, in the upper part of the refrigerant boiling part 1 of the sealed container, there is a refrigerant condensing chamber 8 equipped with a heat transfer fin 15 into which the vapor phase portion of the refrigerant 7 which has absorbed the heat loss of the electrical equipment 6 and has been boiled and vaporized flows thereinto. The air reservoir chamber 10 located therein as well as its outer wall arranged to divide the refrigerant condensing chamber 8 into a plurality of groove-shaped chambers are in contact with the gas phase portion of the refrigerant 7 and the outside air flows through the interior thereof. A refrigerant condensing section 2 is provided, which is constituted by a cooling chamber 9 formed in the shape of a groove with both sides open to the outside and in which heat transfer fins 13 are arranged. At that time, since a high voltage is applied to the electrical equipment 6 inside the refrigerant boiling part 1 of the sealed container, the boiling refrigerant is usually CFC 11.
An electrically insulating material such as No. 3 is used.

In the boiling refrigerant cooling device configured as described above, there is a portion where the loss heat of the electrical equipment 6 comes into contact with the electrical equipment 6 when the boiling refrigerant 7 that undergoes a gas-liquid phase change is circulated in the closed container. The electrical equipment 6 is cooled by being released into the outside air by boiling heat transfer in the refrigerant condensing chamber 8, condensation heat transfer of the gaseous refrigerant in the refrigerant condensing chamber 8, and convective heat transfer in the heat transfer fins 13 in the cooling chamber 9. At that time, in order to ensure the cooling capacity and long-term reliability of the cooling device, it is important to maintain airtightness of the cooling system consisting of both gas and liquid phases of the refrigerant inside the cooling device, and usually the airtightness of the cooling device is The parts of the hermetic container are joined together by welding or brazing to maintain the leakage amount to 10 ^{-7 atm.cc/sec} or less.

For the purpose of maintaining airtightness as described above, an upper header 4 and a lower header 3 are first welded to the main body 2a of the refrigerant condensing section 2 shown in FIG. 7, respectively, and then the whole is welded to the refrigerant boiling section 1. Further, an airtight terminal 5 for drawing out a lead wire of an electric device 6 inside the refrigerant boiling section 1 to the outside is also placed and welded at an appropriate location in the refrigerant boiling section 1. At this time, the air reservoir chamber 10 formed inside the upper header 4 of the refrigerant condensing section 2 is connected to each of the refrigerant condensing chambers 8 divided into a plurality of groove-shaped chambers by the cooling chamber 9, as shown in FIG. In addition to equalizing the pressure inside the hermetic container, it also improves the condensing performance in the refrigerant condensing section 2 by storing a small amount of outside air that inevitably enters the hermetic container during long-term use of the cooling device. It plays a role in preventing deterioration.

On the other hand, a refrigerant condensing chamber 8 inside the refrigerant condensing section 2
The structure of the cooling chamber 9 is, for example, as shown in FIG.
A groove-shaped cooling chamber 9 with both sides open to the outside air and a groove-shaped refrigerant condensing chamber 8 having built-in heat transfer fins 15 that form vertical passages for vapor phase refrigerant therein alternate horizontally. The cooling chamber 9 is closed at its upper and lower sides, and the refrigerant condensing chamber 8 is closed at its front and rear sides by appropriate closing members 12 and 14. and each of them is made to penetrate only in one direction.

In this case, for the purpose of reducing the weight of the entire cooling device and improving heat transfer characteristics in the refrigerant condensing chamber 8 and the cooling chamber 9, the heat transfer fins 13 and 15, the partition plate 11, the closing members 12 and 14, etc. are made of aluminum. However, in consideration of improving the quality control of the product, the partition plate 11 is made of so-called bracing material, which has an aluminum core coated with a bonding wax. After configuring the condensing chamber 8 and the cooling chamber 9 as shown in FIG. 8, the components are heated and cooled in a salt bath or furnace according to predetermined conditions, so that the joints between the respective members are heated and cooled at the same time. Brazing is being performed.

In the closed container of the boiling cooling device configured as described above, the refrigerant condensing chamber 8 and the cooling chamber 9 are brazed all at once, but the formation of the other refrigerant boiling section 1 or the main body 2a and the header in the refrigerant condensing section 2 are performed. Since the joining of parts 3 and 4, or the mutual joining of the refrigerant boiling part 1 and the refrigerant condensing part 2, all require normal welding work, there remains an artificial element that requires labor and skill. Moreover, there are many concerns regarding quality control, such as a decrease in the reliability of airtightness due to welding distortion and air bubbles, and the intrusion of foreign matter into the sealed container during work, resulting in the simultaneous brazing of each of the above-mentioned parts. Not only does this significantly reduce the effectiveness of the process, but it also inevitably becomes economically disadvantageous, especially when mass-producing the same product.

[Purpose of the invention]

In view of the above-mentioned drawbacks of conventional boiling refrigerant type cooling devices, the present invention has been developed to simultaneously process all members pre-formed into predetermined shapes from materials coated with a joining brazing material under stable conditions. By airtightly connecting the sealed container of the boiling refrigerant type cooling device, quality control is easy and high reliability is achieved, especially in the case of mass production. The purpose of the present invention is to provide a boiling refrigerant type cooling device. [Summary of the Invention] In order to achieve the above object, the present invention provides the above-mentioned cooling device, in which a closed ring-shaped frame is provided on one side of the partition plate made of a suitable plate material, and a closed ring-shaped frame is provided on the other side of the partition plate. Two closed annular frames are arranged in the upper and lower parts, heat transfer fins are provided inside the one frame so as to allow ventilation in the vertical direction, and the two frames arranged above and below each other. A predetermined number of unit structures each having heat transfer fins arranged between the bodies so as to allow ventilation in the horizontal direction are stacked with another partition plate interposed therebetween, and the unit structure is stacked so as to allow ventilation in the vertical direction. Sealed refrigerant condensing chambers are alternately located in the portions of the heat transfer fins that are arranged, and cooling chambers that are open to the outside air on both sides are placed alternately in the portions of the heat transfer fins that are arranged to allow ventilation in the horizontal direction. Both ends of the laminate are sandwiched between end plates made of appropriate plate materials, and holes formed in the upper part of each partition plate and above the heat transfer fins inside the one frame body are formed. The space and the space inside the upper frame of the two frames form an air reservoir, and the holes formed at the bottom of each partition plate and the air flow inside the one frame form an air reservoir. A refrigerant boiling chamber is formed by the space below the heat fin and the space inside the frame disposed below of the two frames so as to penetrate through the stack in the stack direction, and each of the members At least the diaphragm and frame members are made of a material covered with a joining brazing material, and the structure consisting of each of the above members is simultaneously brazed between the members in accordance with predetermined conditions in an appropriate brazing equipment. At the same time, a lead wire of the electrical equipment to be cooled is fixedly held in the boiling refrigerant in the refrigerant boiling chamber by an appropriate means in an outlet hole formed in the both end plates and communicating with the refrigerant boiling chamber. By joining and sealing the airtight terminals for extraction, a boiling refrigerant type cooling device consisting of a completely sealed container that does not require any manual work such as welding is constructed.

[Embodiments of the invention]

Next, details of the present invention will be explained based on embodiments shown in the drawings.

In FIGS. 1 and 2, one frame 22 made of a bar is placed on one side of a plate-shaped partition 21, and two frames 23 and 24 made of a bar are placed on the other side. are arranged so that the frame body 23 is located at the bottom and the frame body 24 is located at the top, and inside the frame body 22, corrugated heat transfer fins 15 made of a thin plate material are arranged to allow ventilation in the vertical direction. Also, the frame body 23 and the frame 24
A corrugated heat transfer fin 13 made of a thin plate material and designed to allow ventilation in the horizontal direction is arranged between the two. In this way, the partition plate 21, the frame body 2
2, 23 and 24 and heat transfer fins 13 and 1
As shown in FIG. 2, a predetermined number of unit structures composed of 5 are laminated with another partition plate 21 interposed between them, and both ends of the laminate are sandwiched by plate-shaped end plates 20. In the part where the heat transfer fins 15 are located, there is a refrigerant condensing chamber 8 sealed by a frame 22, and in the part where the heat transfer fins 13 are located, there is a groove-shaped cooling groove that opens to the outside air on both sides. The chambers 9 are formed such that they are located alternately.

In this case, at least the partition plate 2 of the above-mentioned constituent members
1. The frames 22, 23, and 24 are all made of a so-called brazing material with aluminum as the core material and the surface coated with a bonding brazing material in advance. The laminate is heated and cooled according to predetermined conditions in a suitable soldering equipment such as a vacuum brazing furnace to simultaneously braze each of the members. As a result, an air reservoir chamber 10 is formed which penetrates the stacked body in the stacking direction by the hole 28 in the upper part of the partition plate 21, the space above the heat transfer fins 15 inside the frame body 22, and the internal space of the frame body 24. In addition, an inner space of the refrigerant boiling section 1 that penetrates the stacked body in the stacking direction is formed by the lower part of the partition plate 21, the hole 27, the space below the heat transfer fins 15 inside the frame body 22, and the inner space of the frame body 23. are formed respectively. Furthermore, end plates 20 at both ends of the laminate
A hole 2 communicating with the inner chamber of the refrigerant boiling section 1 is provided at the bottom of the .
6 is provided and an outlet 25, in this case consisting of a pipe, is joined to the hole 26. To join the outlet portion 25, before the laminate is brazed all at once, the outlet portion 25 is connected to the end plate by inserting an annular plate 25a between brazing material or brazing material as shown in FIG. 20, it is possible to perform simultaneous brazing of the laminate at the same time. Then, the lead wires of the electrical equipment to be cooled (not shown) fixedly held inside the inner chamber by appropriate means are pulled out through the outlet portion 25, and a predetermined amount of the coolant is poured into the inner chamber of the refrigerant boiling section 1. A boiling refrigerant type cooling device for the electrical equipment is constructed by filling a refrigerant such as Freon 113 and hermetically sealing the outlet 25 with an airtight terminal (not shown).

In the boiling refrigerant type cooling device configured as described above, the heat loss of the electric equipment fixedly held in the inner chamber of the refrigerant boiling section 1 is caused by the gas-liquid phase change of the boiling refrigerant in the closed container. Due to the circulation, the refrigerant is released into the outside air due to boiling heat transfer at the part where it contacts the electrical equipment, condensation heat transfer of the vapor phase refrigerant inside the refrigerant condensing chamber 8, and convective heat transfer at the heat transfer fins 13 of the cooling chamber 9. Cooling of the electrical equipment is performed. Incidentally, the frames 22, 23, and 24 need to be formed into a closed ring shape, but the joints can be made by cutting to a desired thickness from a tube material formed by drawing or extrusion, whose cross-sectional shape is the planar shape of each frame. It is possible to form a closed annular frame without any.

These frames 22, 23 and 24 are attached to a bar 30.
When forming the rod 30, as shown in FIGS. 3, 4, and 5, the bar 30 is appropriately bent into a closed ring shape, both ends of the bar 30 are butted together, and the abutted portions are brazed. etc. Bar material 3
When bending the 0 at right angles, the work can be made easier and safer by making a cut in the bent portion in advance as shown in the figure.

The joints of the butt parts of each frame are shown in Figures 3a and 4.
As shown in Figure a and Figure 5a, the abutting portion 3
5, it is also possible to sandwich and braze a joining piece 32 preferably made of the same brazing material as the partition plate 21, or as shown in FIGS. 3b, 4b, and 5b. Both ends of the material 30 are bent inward at right angles to a predetermined length, and the bent portions 33,
33 to each other and this abutting portion 36
It is also possible to do this by brazing.

Furthermore, as shown in FIGS. 6a and 6b, the frame 2
2, 23 and 24 and the partition plate 21 are both made of brazing material. Even if there is a slight gap left in the notch 31 of the frame body or the abutment part 35 or 36, the frame body and the partition plate 21 are made of brazing material during the brazing operation. Since solder is supplied from both sides of the plate to fill the voids, there is an advantage that brazing at these locations can be ensured.

In the airtight container made of the laminate, the inner chamber of the refrigerant boiling section 1 accommodates the electrical equipment to be cooled and maintains a necessary insulation distance between the electrical equipment and the wall of the inner chamber to accommodate the boiling refrigerant. Since the frame body 23 has a sufficient volume to be immersed in water, there is a risk that the stress generated in the frame body 23 will increase significantly when the internal pressure of the interior chamber increases. The shape, size, and corner radius of the hole 27 in the partition plate 21 are selected so as to relieve stress and reinforce the portion where the hole 31 is present.

Furthermore, when using groove-shaped bars made of thin plates coated with brazing material as the material for the frames 22, 23, and 24, the molding time of each frame is faster than when using solid bars. The cross-sectional deformation of is small, and therefore the flatness of the brazing surfaces of mutually laminated layers in the laminated body of each frame body is less likely to collapse, and there is no risk of reducing mutual overlapping allowance for brazing, and Partition plate 21 or end plate 2 similarly made of bousing material
0 and can absorb some dimensional errors, so it is extremely advantageous when constructing a sealed container by combining a large number of members with relatively complex shapes as in the present invention. It is.

〔Effect of the invention〕

As described above, the present invention provides a boiling refrigerant type cooling method in which an electrical device such as a semiconductor stack is immersed in a boiling refrigerant in a closed container, and the electrical device is cooled by utilizing circulation accompanied by a gas-liquid phase change of the refrigerant. In the device, one frame made of a suitable bar is placed on one side of a partition plate made of a suitable plate, and two frames made of a suitable bar are placed on the upper and lower parts of the other side. heat transfer fins are placed inside the one frame body so as to allow ventilation in the vertical direction, and between the two frame bodies arranged above and below so as to allow ventilation in the horizontal direction. A predetermined number of unit structures each having heat transfer fins arranged on the fins are laminated with another partition plate interposed therebetween, and the heat transfer fins are sealed in the portions of the heat transfer fins arranged so as to allow ventilation in the vertical direction. Refrigerant condensing chambers and cooling chambers open to the outside air on both sides are formed alternately in the portions of the heat transfer fins arranged to allow ventilation in the horizontal direction, and both ends of the laminate are formed. It is sandwiched by end plates made of appropriate plate materials, and is connected to the holes formed in the upper part of each of the partition plates, the space above the heat transfer fin inside the one frame body, and the upper part of the two frame bodies. An air reservoir is defined by the internal space of the frame body disposed in A refrigerant boiling chamber is formed by the inner space of the frame body disposed below among the frame bodies, respectively, so as to penetrate the laminated body in the lamination direction, and at least the partition plate and the frame plate are made of a bonding brazing material. The structure is made of a coated material, and the members are simultaneously brazed in accordance with predetermined conditions in an appropriate brazing equipment, and
Connecting airtight terminals for drawing out lead wires of the electrical equipment to be cooled, which are fixedly held in the boiling refrigerant in the refrigerant boiling chamber by appropriate means, to outlet holes formed in the both end plates and communicating with the refrigerant boiling chamber. The airtight container of the boiling refrigerant cooling system is constructed from a frame body and plate-shaped body made of easily available brazing material, and the weight of the entire system is reduced by simple assembly and simultaneous brazing of all parts. In addition, it eliminates complicated and man-hour-intensive welding work to ensure uniform quality of airtight joints, and prevents foreign matter such as spatter during welding and powder from joining the parts from entering the sealed container. This has the effect of improving product reliability and reducing manufacturing costs by preventing this. And exit part 2
If 5 is brazed at the same time as other members are brazed, the work involving human elements can be further reduced.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing the constituent members of the boiling refrigerant type cooling device of the present invention, FIG. 2 is a schematic vertical cross-sectional view of the cooling device of the present invention constructed from the above-mentioned members, and FIGS. 3 a, b, Figures 4a, b and 5a, b are schematic front views of each frame formed from a bar among the members, and Figures 6a, b are the joints between the frame and the plate-shaped body. 7 is a longitudinal sectional view showing a conventional device, and FIG. 8 is a perspective view schematically showing a condensing section of the conventional device. 1...refrigerant boiling section, 8
... Refrigerant condensing chamber, 9 ... Cooling chamber, 10 ... Air reservoir chamber, 2 ... End plate, 21 ... Partition plate, 22, 23 and 24 ... Frame, 25 ... Outlet, 26 ... ... Holes formed in the end plate, 27 and 28 ... Holes formed in the partition plate, 30 ... Material of the frame.

Claims (1)

[Scope of Claims] 1. Boiling refrigerant type cooling in which an electrical device such as a semiconductor stack is immersed in a boiling refrigerant in a closed container, and the electrical device is cooled by utilizing circulation accompanied by a gas-liquid phase change of the refrigerant. In the device, one closed ring-shaped frame is arranged on one side of a partition plate made of a suitable plate material, and two similarly closed ring-shaped frames are arranged on the upper and lower parts of the other side, respectively, Heat transfer fins are provided inside the one frame body to allow ventilation in the vertical direction, and heat transfer fins are provided between the two frames arranged above and below to allow ventilation in the horizontal direction. A predetermined number of unit structures are stacked with another partition plate interposed therebetween, and a refrigerant condensation chamber sealed in a portion of the heat transfer fins arranged to allow ventilation in the vertical direction is provided. Cooling chambers that are open to the outside air on both sides are formed alternately in the portions of the heat transfer fins arranged to allow ventilation in the horizontal direction, and both ends of the laminate are formed with ends made of appropriate plate materials. A frame body which is sandwiched between the plates and is disposed above the hole formed in the upper part of each of the partition plates, the space above the heat transfer fin inside the one frame body, and the frame body disposed above the two frame bodies. An air reservoir chamber is defined by an internal space, and an air reservoir is defined by a hole formed in the lower part of each of the partition plates, a space below the heat transfer fin inside the one frame body, and a lower part of the two frame bodies. 1. A boiling refrigerant type cooling device, characterized in that a refrigerant boiling chamber is formed by an internal space of a frame disposed in the laminate so as to penetrate through the laminate in the laminate direction. 2. A boiling refrigerant type cooling device according to claim 1, wherein each of the frames is formed from a groove-shaped rod. 3. In the device according to any one of claims 1 and 2, a frame body disposed at least at a lower part of the frame bodies disposed at an upper part and a lower part of one surface of the partition plate. A boiling refrigerant type cooling device characterized in that the shape, size, and corner radius of the hole formed in the lower part of the partition plate are selected so as to relieve the stress generated in the frame and to reinforce the frame. 4. The device according to any one of claims 1 to 3, characterized in that each member such as the diaphragm, the frame, the heat transfer fins, and the end plate is integrally joined by brazing. A boiling refrigerant type cooling device.