JPS61102799A - Liquid chilling box and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

Fields of use for construction. The present invention relates to a liquid cooling box used to cool a heat generating element such as a power transistor and keep it at a constant temperature, and its solution. <Prior Art> Liquid cooling boxes have conventionally been used to cool heating elements such as power semiconductor devices and maintain them at a constant temperature. Liquid cooling,
Generally, they are advantageous in that they are small and have good cooling efficiency. 7 to 9 show a conventional general liquid cooling box. The liquid cooling box 22 is made of thick gold PAilSI cooling plate n.
A meandering coolant passageway is formed on the surface, and the n11 passage 24
A cooling liquid inlet 25i is provided at the beginning and end of the and a discharge port 26 are provided respectively, and the cover bottom plate r is connected to the cooling plate bottom if0.
The object 8 to be cooled is fixed to the cooling plate h&cvP, and a cooling liquid such as water is injected into the injection port δ.
By circulating the supply coolant through the coolant passage (during the ninth period, in the direction of arrow C), the heat generated in the object 8 is
tl121i! to the cooling liquid flowing through the cooling plate n! The object 8 can be cooled by being removed to the outside. A liquid cooling box in which the cooling liquid passage has a zigzag elbow shape has also been used in the past, but its corner capabilities are the same as those of the liquid cooling box described above. <! ? ! +YL's Node Points to be Solved> Generally speaking, to increase the cooling capacity of a liquid cooling box, it is best to lengthen the cooling/night passage to increase the contact area with the cooling liquid. ξHowever, in the conventional liquid cooling box described above, the coolant flows in a meandering or zigzag pattern.If the cooling ellipse is lengthened, the flow resistance of the coolant increases significantly, and the coolant injection pump Since it would be necessary to significantly increase the power, it was desirable to dramatically improve the cooling capacity.In addition, several objects were placed regularly on the cooling plate. When used, the temperature of the cooling plate rises due to the heat generated by the object, and in this case, the layer surface 714 degrees at the center of the plate is generally higher than that of the plate. However, in the 6Y liquid cooling box, the cooling liquid enters from the inlet around the plate, exits from the center of the plate, and exits from the outlet on the solid side of the rounded plate. As shown in Fig. 10, the temperature distribution is lowest in the side part near the injection port 5 and highest in the side part near the discharge point 0, indicating that the temperature distribution of the cooling plate corresponds to the arrangement of the object. There wasn't. Therefore, the cooling effect is not effectively exerted, and it is impossible to keep all objects at a uniform temperature.Furthermore, in a liquid cooling box, the cooling plate is located between the stands. In other words, a rod with a short distance between the surface of the cooling plate and the cooling channel allows the heat of the object to be transferred to the cooling liquid in a shorter time, and the object can be further cooled.
However, in conventional liquid cooling boxes, the cooling liquid passages are usually formed by cutting the bottom of the cooling plate, and the
It is tough to make one cooling plate with a short distance between the passage and the plate surface. Moreover, since it is a cutting process, it has the disadvantages of long processing time, high processing cost, and low material yield. The purpose of this is to provide a liquid cooling box that can easily increase the cooling capacity by lengthening the cooling liquid passage and cool all objects to a uniform temperature. Another object of the present invention is to provide a fusuma cooling box that, in addition to improving the cooling capacity described above, can reduce manufacturing time, reduce costs, and improve material yield. The purpose of the liquid cooling box is to provide a manufacturing method for solving the 0<+4R problem> by Michiaki Ki. When cooling things down

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In the cold box, a coolant passage in the shape of a whirlpool is formed on the bottom of the cooling plate to allow the coolant to flow, and the coolant inlet and outlet are connected to the center of the whirlpool of the passage. and an outer portion of the vortex, and a cover bottom plate is provided on the bottom surface of the cooling plate in a watertight manner. That is, by forming the coolant passage in the shape of a spiral cedar, this invention can greatly reduce the flow resistance of the coolant, and reduce the passage force (length) even if the flow resistance increases only slowly. The 100 million yen of cooling is caused by the vortex in the passage*
Center ← 11+7. By making the M rod flow out from the spiral wall of the inlet passage, the cooling effect of the cooling liquid can be applied to the object. ：This function is designed to respond appropriately to the bubbles, that is, the distribution of heat generation. In addition, the method for manufacturing a liquid cooling box according to another aspect of the present invention includes cutting D
The liquid cooling box of the above invention can be produced by forming a cooling liquid This is the way to do it. Also, the cooling liquid chamber C/ζ of the cooling plate is made of aluminum-based material and has an open bottom surface to form a cooling liquid chamber inside, and the vortex 1 is made of aluminum-based material.
The strips are housed and brazed together to form a spiral elbow-shaped coolant passage in the moving plate 2, and the coolant inlet and outlet are connected to the spiral center part of the rib passage and y!ll
Each H1 is installed on the outer side, and the bottom plate of the cover is attached to the cooling plate IK.
This method is characterized by the fact that it is made by placing it on the surface in a watertight manner. According to this invention, even if f+fj and extremely thin cooling plates are used, the liquid cooling box of the above invention can be manufactured. Therefore, the distance between the surface of the cooling plate and the coolant passage can be significantly shortened compared to the conventional method. It is rumored that aluminum-based materials generally have a high heat transfer rate, so the cooling plate and strips are made of aluminum-based material to quickly transfer the heat generated by the liquid cooling box of this invention to the object on the cooling plate. The cooling performance is high due to the fact that it can be transmitted to the coolant in a short amount of time. Furthermore, since aluminum-based materials are generally inexpensive, the liquid cooling box of the present invention made of aluminum is economically advantageous. Arzenium thread materials that can be applied to this invention include silicon (Si), copper (Cu), carbon dioxide (Mn), zinc (Zn), Titanium (Ti), chromium (C'), zirconium (Zr), magnesium (~
There is an alloy that has a small amount of (g) etc. added. JIS3nn3.1050.705
There is a 2nd class σ Noalium Society 0 village department. Furthermore, as an aluminum alloy material, aluminum blue butterfly, the above aluminum alloy material σ, the s+p point is 10 to 1 on the surface.
00°C low alloy, t? , jsi 7~+2wt%
May be coated with resonant A/-8i eutectic alloy○
Physically, JIS3003 material σ) 4343 on the surface
A clad material (such as BA12PC) may be used. In this interesting development, the method of joining the cooling plate and the can stock, that is, the method of sigma brazing between aluminum materials is 18: If joining (brazing) cannot be done easily, , This type of liquid cooling box has low productivity.
become. As described in the present inventor et al.
Chemical treatment 11! We have proposed a method in which a film consisting of potassium pentafluoroaluminate (K2Aj!t'5) in the form of 7 lux is formed on the surface of an aluminum-based material using a p-liquid, and then heated and brazed.
With this new brazing method, a 7-lux layer can be easily formed simply by contacting the aluminum thread material with a processing solution, and the dC2 curve of the brazing material during the subsequent brazing process is smooth. As a result, a defect-free brazed joint can be formed with a small amount of brazing material, and there is no need to clean the brazed joint after soldering. Will not corrode brazed joints. Therefore, by using the above method, potassium and A chemical conversion treatment containing fluorine is brought into contact to form a pentafluoroaluminum/potassium film, and then the joint g1 is heated to ffn to braze and join the coolant and the band with a brazing filler metal, When the liquid cooling box is made by attaching the cooling liquid inlet and outlet and the cover floor plate, it will be large enough to make the roughening of each joint proceed smoothly.
The liquid cooling box of the present invention having a coolant passage with a spiral shape can be easily and easily constructed. The durability of the cold box is improved. The E period chemically treated oil I used in this process is characterized by the following method. One of them is potassium hydrogen fluoride (K) (F23 is dissolved in water. The solution M of potassium hydrogen heptadide is 1 to 80 g per 1 liter of water, which causes cold damage to the production of potassium pentafluoroaluminate. (KF'> and hydrogen fluoride (HF) may be dissolved in water to make a mixed water/Anamisaki. Also, potassium hydroxide (KOH) and hydrogen hydride may be dissolved in water. .These aqueous solutions are
It is preferable that the molar ratio of fluorine and potassium is 1 to 10, and that the potassium content is 0.5 to 40 g/l. Methods for contacting include immersion,
Examples include coating, spraying, etc., but when contacting it, open it,
-MK is not determined by the potassium and fluoride in the chemical conversion solution, the red color, the 41 degrees of the L strike, etc., but just in case, the axis of baseness v+1 is 0.5 seconds to Δ''. good. This contact destroys the oxide 4p present on the surface of the bonding site of the aluminum-based material, causing a chemical reaction between aluminum, potassium, and fluorine, and pentafluoroaluminium-reducing potassium is produced. The formation of this compound proboscis changes depending on the use. Naturally, the chemical reaction proceeds satisfactorily even at room temperature. However, when the temperature of the bonding area is raised to, for example, 40 to 700C, the removal of the oxide film is completed and rapid. It is strongly bonded and can be easily joined with brazing filler metal. (Example) Below, practical examples of the present invention will be explained with reference to the drawings. Actual example 1 The liquid cooling box in this example has a variable connection with the AC motor! f! 1
0πl '4, which was used for Surname's Kotogaishoki
%Ishihakama As shown in Figure 3, one liquid cooling box manufacturer forms a swirling coolant passage 2 on the r side of the cooling force 1 and 3.
Place the inlet 4 and the outlet 5 at the cooling plate 4 at the beginning of the spiral center of the passage 2 and the cooling plate 4 outside the crystal stop. (Watertight with a rubber sheet etc. on the surface. 7F entrance 4
It is connected to the IT pump and the small discharge port 5 (and the goradiator) through tubes 7. On the cooling plate are the power transistors, which are the main recovery parts of the pot changing device. 8... or (2) is added closely. Then, a pump is made and a coolant such as water is injected into the inlet 4.
It is injected and distributed along the vortex ω-shaped passage 2 to the discharge port 5.
Than? (in the direction of the arrow in Figure 3),
It is possible to cool the power transistors 8 by absorbing the heat generated in the power transistors 8 in the coolant and removing it to the outside during a normal operation. In the example of the liquid cooling system, the resistance in the flow of the coolant is small, and the coolant can be cooled at a low speed with low pump power. I did it. In addition, when using the liquid cooling beak 1 of the example, the surface of the cooling plate 3,
1.λ is almost uniform, and all power transistors 8.
... was able to be maintained at a uniform temperature.Also, when using a liquid cooling box lO having a tactile cooling liquid passage 9 shown in FIG. Since there is a structure in which 'kt' gradually passes from the side to the surrounding side; T', it was possible to place all the objects to be cooled in one uniform prefectural song. Example 2 Figure 6-1 shows a brazing type liquid cooling box 12. The aluminum material-like cooling plate 13 of the liquid cooling box 12 has an open bottom side and has four cooling chambers 14 inside, and one cooling plate 13 has a thin wall.
A cooling liquid discharge port 15 is provided at the rear part. The liquid cooling 1fi12 is a spiral strip material 1 made of aluminum material.
6 to the coolant chamber 14 of the cooling plate 13, and soldered to form a swirl-shaped coolant passage Was 17 on the bottom of the cooling plate, and then the coolant inlet 18 was installed in the center of the plate. A cover bottom plate 19 is attached to the bottom of the cooling plate via a rubber sheet or the like. In this case, the brazing joint is first applied to the wall surface of the cooling liquid chamber 14 and the side surface of the spiral strip material 16 using a chemical conversion treatment solution containing potassium and fluorine (composition: according to the above description) to form a benzofluoroaluminium M potassium skin lesion,
Next, as shown in FIG.
Contact through the backing material -? After that, put it in the furnace I.
Heat the cooling plate 13 to 610-620°C ζ・ζ.
And band material 16? This was done by a method of forming a V joint. Then, a cooling liquid such as water is injected from the inlet 18 and a vortex 1 is created.
4 ij'rT along the passage 17 of the shape and the outlet 15
By discharging the heat (in the direction of arrow B in No. 51), the heat generated by the object 2] placed on the cooling plate can be absorbed by the cooling liquid and removed. Liquid cooling box 12
Now, the cooling plate is controlled by the y # meat, and the cooling performance is significantly improved compared to the actual example 1σ. Compared to the conventional A-method using 611'JlIQq machining, the processing time could be significantly reduced and the cost could be reduced. Unfortunately, the materials were expensive. ! By brazing and joining the above chemical conversion treatment liquid with 4 (#i), liquid cooling (12 inches) does not occur even when used for a long period of time, and it has excellent durability. <Is> □゛J, :pill L reminder
1 Ria'' has created a coolant passage (1).・The cooling capacity is improved, and even if the contact area with the cooling pot is increased by lengthening the lj1 passage, there is almost no need to apply 41 force, easily increasing the cooling power. By creating a structure in which the cooling liquid flows in a spiral shape from the center of the cooling plate to the IM side, the cooling effect is applied to the distribution of the object, that is, to the heat-generating throat cloth. (1) so that it can be demonstrated in response to each situation.
The surface temperature of the cooling plate is almost uniform, and the temperature of the object can be maintained at a uniform temperature of 74 degrees. The liquid cooling box for the above-mentioned January month is made by forming one liquid curve in the calendar month by joining the plates by brazing.By using the four method, the illumination time during the manufacturing process can be significantly shortened compared to the conventional method. Moreover, the processing cost can be reduced, and the material yield 9 can be significantly improved. Is it possible to make 1llJ using a thin, extremely thin cooling plate and further improve cooling performance? can be done.

[Brief explanation of the drawing]

1m and 2nd 4 are a plan view and a side IfrI view showing the cooling box of Example 1 of the present invention, 2r! Fig. 3 is a front view showing the inside of the liquid cooling box in Figs. 1 and 2; Section 4i shows the internal height of the liquid cooling box in Figure 2.
Cross-sectional view showing the inside of the liquid cooling box, No. 7FA and No. 8 are planes #XJ showing the conventional liquid cooling box.
Figure 1 '8 lcl threshold is the temperature distribution on the surface of the cooling plate of the liquid cooling box in Figures 7 and 8. FIG. 4, 1, Hl, 12...liquid cooling box 2,17...
Coolant passage 3.13...Cooling plate 4.18...
・Resident population 5.15...Exhaust port 6.11...
Cover bottom plate 8.21...Target patent developer Toyota Central Research Institute Co., Ltd.] ζl J
” -, = 2-Figure 7 Figure 8・q92 10=

Claims (2)

[Claims] (1) In a liquid cooling box that cools objects on the cooling plate with the cooling liquid flowing inside the cooling plate, a spiral-shaped cooling liquid passage is formed on the bottom of the cooling plate to allow the cooling liquid to flow. A liquid cooling box characterized in that a liquid inlet and a liquid outlet are provided at a spiral center portion and a spiral outer portion of the passage, respectively, and a cover bottom plate is watertightly covered with a bottom surface of a cooling plate. (2) A spiral strip made of an aluminum material is placed in the cooling liquid chamber of a cooling plate made of an aluminum material, the bottom side of which is open, and a cooling liquid chamber is formed inside, and the spiral strip made of an aluminum material is brazed and joined to form a spiral shape. A cooling liquid passage is formed on the bottom surface of the cooling plate, and a cooling liquid inlet and an outlet are provided in the spiral center part and the spiral outer part of the passage, respectively, and a cover bottom plate is made to cover the bottom surface of the cooling plate in a watertight manner. A method of manufacturing a liquid cooling box characterized by: