JP6138197B2 - Liquid-cooled cooler and method of manufacturing radiating fin in liquid-cooled cooler - Google Patents

Description

  The present invention relates to a liquid-cooled cooler provided with a heat sink that releases heat from a heating element to a coolant, and a method of manufacturing a radiating fin in the liquid-cooled cooler.

  In recent years, the heat generation density of heat generating elements such as CPU (central processing unit), LSI (large-scale integration), and power semiconductor elements has increased, resulting in higher temperatures. Therefore, liquid cooling has higher cooling performance than conventional air-cooled coolers. A vessel may be used. In the liquid cooling type cooling device in which the region where the cooling fins are provided is formed long in the flow direction of the coolant, the temperature rise is larger in the region perpendicular to the flow direction of the coolant as the region is closer to the heating surface. In the region farther from the heat generating surface, the temperature rise becomes smaller. Since the amount of heat radiation is proportional to the temperature difference between the heat generating element and the cooling liquid, the cooling capacity decreases when the temperature of the cooling liquid in the region near the heat generating surface becomes high due to non-uniform temperature distribution in the cooling liquid.

  In order to suppress the deterioration of the cooling performance, it is necessary to make the temperature distribution of the coolant uniform in a cross section perpendicular to the flow direction of the coolant, but the temperature distribution of the coolant is perpendicular to the flow direction of the coolant. In order to make the cross section uniform, it is effective to sufficiently stir the coolant. For this reason, conventionally, a liquid cooling cooler (see, for example, Patent Document 1) in which fins are arranged on two opposing surfaces in the coolant passage to stir the coolant, or comb-shaped radiating fins There has been proposed a liquid cooling cooler (see, for example, Patent Document 2) in which unevenness for guiding the cooling liquid is provided on the surface to stir the cooling liquid.

JP 2002-141164 A JP 2012-033966 A

  As described above, providing the radiation fins and stirring the coolant is effective for making the temperature distribution of the coolant uniform in a cross section perpendicular to the flow direction of the coolant, but is disclosed in Patent Document 1. The conventional liquid cooling cooler has a structure in which fins are arranged on two opposing surfaces, and the fins contributing to heat radiation are only the fins arranged on one surface thermally connected to the heating element. The fins arranged on the other surface serve to agitate the coolant, but do not contribute to heat dissipation. As described above, the conventional liquid-cooled cooler disclosed in Patent Document 2 needs to provide fins that do not contribute to heat dissipation in the cooler, and thus there is a problem that the cooler is increased in size.

  Furthermore, the conventional liquid-cooled cooler disclosed in Patent Document 2 described above has a structure in which the coolant is agitated by providing irregularities for guiding the coolant on the surface of the comb-shaped heat dissipating fins. Since the fin is arranged only on the surface that is thermally connected to the heat generating element, it can be downsized to some extent, but the area away from the unevenness of the surface of the radiating fin, that is, near the middle of the radiating fin and the radiating fin The coolant that has flowed into the tube cannot be affected by the unevenness, and there is a problem that a sufficient stirring effect cannot be obtained.

  The present invention has been made in order to solve the above-mentioned problems in the conventional liquid cooling cooler, and is provided with a liquid cooling cooler provided with radiation fins capable of effectively stirring the cooling liquid. The purpose is to provide.

  It is another object of the present invention to provide a method of manufacturing a heat radiating fin that can easily manufacture a heat radiating fin in a liquid-cooled cooler.

The liquid cooling cooler according to this invention is
A jacket that circulates the coolant in the interior; and a heat sink that contacts the coolant that circulates in the jacket; and the heat generated by the heating element is transmitted to the coolant via the heat sink to dissipate heat. A liquid cooling cooler,
The heat sink is
A heat sink base member having a first surface facing the inside of the jacket;
A plurality of heat dissipating fins provided on the first surface portion of the heat sink base member and in contact with the coolant flowing through the jacket;
With
The plurality of heat dissipating fins are constituted by pillars whose cross section is substantially a regular triangle, whose cross section is a regular square, or whose cross section is a regular hexagon, and the direction in which the pillars extend is the jacket. Is inclined toward the downstream side of the coolant flowing through the interior of the
The side surface of the radiation fin is parallel to the side surface of another adjacent radiation fin.
Is configured to,
The plurality of heat dissipating fins are further in contact with the first surface portion of the heat sink base member and are inclined toward the downstream side of the coolant flowing through the inside of the jacket, and the first from the inclined portion. An upright portion that stands upright against the surface portion of the
It is characterized by that.

Moreover, the manufacturing method of the radiation fin in the liquid cooling cooler by this invention is as follows.
A jacket that circulates the coolant inside, and a heat sink that contacts the coolant that circulates inside the jacket, the heat sink having a first surface portion facing the inside of the jacket; and A plurality of heat dissipating fins provided on the first surface portion of the heat sink base member and in contact with the coolant flowing through the jacket; and the plurality of heat dissipating fins flow through the jacket. A radiating fin in a liquid cooling cooler configured to be inclined toward the downstream side of the cooling liquid, wherein the heat generated by the heating element is transmitted to the cooling liquid via the heat sink and radiated. A manufacturing method of
On the first surface portion of the heat sink base member, a plate-like radiating fin region protruding from the first surface portion with a predetermined dimension is formed.
A plurality of circular blades having different diameters arranged at predetermined intervals are rotated, and the plurality of radiating fins are simultaneously cut by the plurality of circular blades at an angle inclined with respect to the first surface portion. Form,
It is characterized by that.

Furthermore, the manufacturing method of the radiation fin in the liquid cooling cooler by this invention is as follows.
A jacket that circulates the coolant inside, and a heat sink that contacts the coolant that circulates inside the jacket, the heat sink having a first surface portion facing the inside of the jacket; and A plurality of heat dissipating fins provided on the first surface portion of the heat sink base member and in contact with the coolant flowing through the inside of the jacket, the heat dissipating fins having a substantially equilateral triangle in cross section Or, the cross section is constituted by a column having a substantially square shape or a cross section having a substantially regular hexagonal shape, and the extending direction of the column is inclined toward the downstream side of the coolant flowing through the jacket. The side surfaces of the heat radiating fins are configured to be parallel to the side surfaces of other adjacent heat radiating fins, and the plurality of heat radiating fins are configured. Is further in contact with the first surface portion of the heat sink base member and inclined toward the downstream side of the coolant flowing through the inside of the jacket, and from the inclined portion to the first surface portion. A heat-radiating fin manufacturing method for a liquid-cooled cooler, wherein the heat generated by the heating element is transferred to the cooling liquid via the heat sink to dissipate heat. There,
On the first surface portion of the heat sink base member, a plurality of protrusions arranged in parallel with each other and protruding from the first surface portion with a predetermined dimension are formed.
The plurality of ridges are provided in contact with the first surface portion, are inclined in a predetermined direction with respect to the first surface portion, and are provided in contact with the inclined ridge portion and the inclined ridge portion, An upright ridge that stands upright with respect to the first surface,
By cutting the plurality of protrusions, the plurality of radiation fins are formed.
It is characterized by that.

According to the liquid-cooled cooler according to the present invention, the plurality of radiating fins are constituted by columns having a substantially equilateral triangle in cross section, a substantially regular square in cross section, or a substantially hexagon in cross section. In addition, the extending direction of the pillars is inclined toward the downstream side of the coolant flowing through the inside of the jacket, and the side surfaces of the heat radiating fins are parallel to the side surfaces of the other adjacent heat radiating fins. The plurality of heat dissipating fins are further configured to incline toward the downstream side of the cooling liquid in contact with the first surface portion of the heat sink base member and flow through the jacket, and the inclination The cooling liquid is perpendicular to the direction parallel to the first surface portion of the heat sink base member along the side surface of the heat sink fin. Direction Bidirectional to stirred, it is possible to suppress the reduction of the uniform can cooling performance the temperature distribution of the cooling liquid in the cross section perpendicular to the flow direction of the cooling liquid. Accordingly, since the radiating fins need only be arranged on the surface where the heat generating elements are arranged, the liquid cooling cooler can be reduced in size.

  Further, according to the method of manufacturing a heat radiating fin in the liquid-cooled cooler according to the present invention, a plate-shaped heat radiating fin region protruding from the first surface portion with a predetermined dimension on the first surface portion of the heat sink base member. A plurality of circular blades having different diameters arranged at predetermined intervals are rotated, and the plurality of blades are simultaneously cut at an angle inclined with respect to the first surface portion by the plurality of rotary blades. Since the radiating fins are formed, the inclined radiating fins can be formed very easily.

Furthermore, according to the manufacturing method of the heat radiating fin in the liquid-cooled cooler according to the present invention, the heat sink base member is disposed in parallel to each other so as to protrude from the first surface portion with a predetermined dimension on the first surface portion. A plurality of projecting ridges, the plurality of projecting ridges being provided in contact with the first surface portion and inclined in a predetermined direction with respect to the first surface portion; A plurality of radiating fins are formed by cutting the plurality of ridges, the ridges being provided in contact with the ridges and standing upright with respect to the first surface portion. Therefore, it is possible to very easily form a heat radiation fin having an inclined portion and an upright portion in contact with the inclined portion.

It is a disassembled perspective view of the liquid cooling cooler by Embodiment 1 of this invention. It is a perspective view which shows the heat sink in the liquid cooling cooler by Embodiment 1 of this invention. It is explanatory drawing of the heat sink in the liquid cooling cooler by Embodiment 1 of this invention. It is explanatory drawing of the heat sink in the liquid cooling cooler by Embodiment 1 of this invention. It is a graph explaining the thermal radiation performance of a liquid cooling cooler. It is a schematic diagram explaining the radiation fin of the liquid cooling cooler by Embodiment 1 of this invention. It is a schematic diagram explaining the radiation fin of the liquid cooling cooler of the comparative example with respect to this invention. It is explanatory drawing which shows the radiation fin in the liquid cooling cooler by Embodiment 2 of this invention. It is explanatory drawing which shows the modification of the radiation fin in the liquid cooling cooler by Embodiment 2 of this invention. It is explanatory drawing which shows another modification of the radiation fin in the liquid cooling cooler by Embodiment 2 of this invention. It is explanatory drawing which shows the manufacturing method of the radiation fin of the liquid cooling cooler by Embodiment 3 of this invention. It is explanatory drawing which shows the manufacturing method of the radiation fin of the liquid cooling cooler by Embodiment 3 of this invention. It is a perspective view which shows the heat sink of the liquid cooling cooler by Embodiment 4 of this invention. It is a side view which shows the heat sink of the liquid cooling cooler by Embodiment 4 of this invention. It is a perspective view for demonstrating the manufacturing method of the radiation fin of the liquid cooling cooler by Embodiment 4 of this invention.

Embodiment 1 FIG.
Hereinafter, a liquid cooling cooler according to Embodiment 1 of the present invention will be described in detail with reference to the drawings. 1 is an exploded perspective view of a liquid-cooled cooler according to Embodiment 1 of the present invention. The arrows shown in FIG. 1 indicate the flow direction of the coolant such as water. The liquid cooling cooler 100 includes a water jacket 7 as a jacket for circulating a cooling liquid therein, a heat sink 40, a cooling liquid inlet pipe 8, and a cooling liquid outlet pipe 9.

  The water jacket 7 includes a bottom 71, a peripheral wall 72 formed integrally with the bottom 71, and a coolant passage 6 surrounded by the bottom 71 and the peripheral wall 72. The opposite side 71 side of the coolant passage 6 is open. The peripheral wall portion 72 includes a pair of short side portions 721 and 722 facing each other and a pair of long side portions 723 and 724 facing each other. The coolant inlet pipe 8 fixed to the peripheral wall portion 72 passes through one short side portion 721 of the peripheral wall portion 72 and opens into the coolant passage 6. The coolant outlet pipe 9 fixed to the peripheral wall portion 72 passes through the other short side portion 722 of the peripheral wall portion 72 and opens into the coolant passage 6.

  The heat sink 40 includes a heat sink base member 4 and a number of later-described heat radiation fins 5 formed on the first surface portion 41 of the heat sink base member 4. The heat sink 40 is liquid-tightly fixed to the peripheral wall portion 72 of the water jacket 7 so that the first surface portion 41 faces the coolant passage 6 and closes the coolant passage 6. That is, the coolant passage 6 is formed by a space formed by the bottom 71 of the water jacket 7, the peripheral wall 72, and the heat sink base member 4. The heat radiating fins 5 formed on the first surface portion 41 of the heat sink 40 are inserted into the coolant passage 6 of the water jacket 7. The first heat generating element 1, such as a power semiconductor element, the second heat generating element 2, and the third heat generating element 3 are fixed to the second surface portion 42 of the heat sink 40, respectively.

  A coolant composed of a liquid such as water flows into the coolant passage 6 of the water jacket 7 from the coolant inlet pipe 8 and is discharged out of the coolant passage 6 from the coolant outlet pipe 9. The coolant flowing into the coolant passage 6 cools the first heat generating element 1, the second heat generating element 2, and the third heat generating element 3 via the heat radiation fin 5 and the heat sink base member 4. Here, the first heat generating element 1 is arranged on the most upstream side in the flow direction A of the coolant in the coolant passage 6 with respect to the other heat generating elements, and the third heat generating element 3 is the other heat generating element 3. The second heat generating element 2 is disposed between the first heat generating element 1 and the third heat generating element 3 and is disposed on the most downstream side in the coolant flow direction A in the coolant passage 6 with respect to the element. Has been placed.

  Next, the heat sink 40 will be described in more detail. 2 is a perspective view showing a heat sink in the liquid-cooled cooler according to Embodiment 1 of the present invention, in which the first surface portion 41 of the heat sink base member 4 is positioned above the figure. The heat sink 40 shown in FIG. As shown in FIG. 2, the first surface portion 41 of the heat sink base member 4 is provided with a large number of radiating fins 5 aligned vertically and horizontally. The length direction of these radiating fins 5 is inclined toward the downstream side in the coolant flow direction A at a predetermined angle θ with respect to the direction V perpendicular to the first surface portion 41 of the heat sink base member 4. Yes. Here, the angle θ is referred to as an inclination angle.

  3 and 4 are explanatory views of the heat sink in the liquid cooling cooler according to the first embodiment of the present invention. As shown in FIGS. 3 and 4, each of the radiating fins 5 has a quadrilateral cross section in a direction perpendicular to the length direction. Here, the quadrangle includes any of a square, a rectangle, or a rhombus. The first ridge line 51 of the radiating fin 5 is located on the most upstream side in the coolant flow direction A with respect to the other parts of the radiating fin 5, and the second ridge line 52 facing the first ridge line 51 is: It is located on the most downstream side in the flow direction A of the coolant from the other parts of the heat dissipating fins 5.

  Here, a plurality of radiating fin groups aligned in a direction orthogonal to the flow direction A of the coolant is referred to as a “radiation fin row group”, and a plurality of radiating fin groups aligned in the direction A of the coolant is radiated. This is referred to as “fin row group”. In the radiating fin row group, a first gap 50 a is provided between adjacent radiating fins 5. In the radiating fin row group, a second gap 50b is provided between adjacent radiating fins 5. It does not matter whether the size of the first gap 50a and the size of the second gap 50b are the same.

  Individual radiating fins 5 of one radiating fin row group are arranged at positions corresponding to the aforementioned first gaps 50a of adjacent radiating fin row groups. Similarly, the individual radiating fins 5 of one radiating fin row group are arranged at positions corresponding to the aforementioned second gap 50b of the adjacent radiating fin row groups.

  As described above, the radiating fins 5 are columnar bodies inclined toward the downstream side in the coolant flow direction A at a predetermined angle θ with respect to the direction V perpendicular to the first surface portion 41 of the heat sink base member 4. 2, 3, and 4, the cross-sectional shape is a quadrangular prism having a quadrangular shape, but the shape of the radiating fin 5 is a cylinder, an elliptical column, a cone, an elliptical cone, a polygonal column other than a quadrangular column, Polygonal inference or the like may be used.

  As described above, the radiating fins 5 are inclined to the downstream side in the coolant flow direction A at a predetermined inclination angle θ with respect to the direction V orthogonal to the first surface portion 41 of the heat sink base member 4. As shown in FIGS. 3 and 4, the first fin surface 53 and the second fin surface 54 that are in contact with the first ridge line 51 located on the upstream side in the flow direction A of the coolant are the first fin surface 53 and the second fin surface 54 of the heat sink base member 4. The first surface portion 41 extends at an obtuse angle. On the other hand, the third fin surface 55 and the fourth fin surface 56 that are in contact with the second ridge line 52 located on the downstream side in the coolant flow direction A are acute with respect to the first surface portion 41 of the heat sink base member 4. Is extended.

  Next, the flow of the coolant around the radiating fin 5 will be described. As shown in FIG. 3, the cooling liquid contacts the first fin surface 53 and the second fin surface 54 that form the side surfaces of the radiation fin 5 that has an obtuse angle with the first surface portion 41 of the heat sink base member 4. Then, not only the direction of flow is changed in a direction parallel to the first surface portion 41 of the heat sink base member 4 (see the arrow indicated by a thin solid line), but also away from the first surface portion 41 of the heat sink base member 4. The flow direction is also changed in a direction perpendicular to the first surface portion 41 of the heat sink base member 4 (see the arrow indicated by the thin wavy line).

  Further, as shown in FIG. 4, the coolant is composed of the third fin surface 55 and the fourth fin surface that form the side surfaces of the heat radiating fins 5 that are formed at an acute angle with the first surface portion 41 of the heat sink base member 4. 56, in addition to changing the direction of flow in a direction parallel to the first surface portion 41 of the heat sink base member 4 (see the arrow indicated by the thin solid line in FIG. 4), the first heat sink base member 4 The direction of the flow is also changed in a direction perpendicular to the first surface portion 41 of the heat sink base member 4 so as to approach the surface portion 41 (see the arrow indicated by the thin wavy line in FIG. 4).

  As described above, according to the liquid cooling cooler according to the first embodiment of the present invention, the coolant is perpendicular to the direction parallel to the first surface portion 41 of the heat sink base member 4 by the heat radiating fins 5. Agitated in both directions. The radiating fins 5 are arranged in the radiating fin row group and the radiating fin row group as described above, and the individual radiating fins 5 of the radiating fin row group are the individual radiating fin row groups. It is arranged at a position corresponding to the first predetermined gap 50 between the radiating fins 5.

  Accordingly, since the coolant always collides with the first fin surface 53 and the second fin surface 54 as the side surfaces of the heat radiating fins 5, the coolant cannot travel straight through the interior of the coolant passage 6, and the heat sink base It is sufficiently stirred in both directions parallel and perpendicular to the first surface portion 41 of the member 4. Therefore, the radiating fins 5 need only be provided on the heat sink base member 4 to which the heating elements are fixed, and need not be provided on the bottom 71 of the water jacket 7. Therefore, the liquid cooling cooler can be downsized.

  FIG. 5A is a graph illustrating the heat dissipation performance of the liquid-cooled cooler, and is a graph comparing the heat dissipation performance according to the difference in the inclination direction by calculating the heat transfer coefficient of the heat dissipation fin by numerical simulation. In FIG. 5A, the vertical axis represents “heat transfer coefficient” [a. u] (arbitrary unit: arbitrary unit), the horizontal axis indicates “distance from upstream of heat radiating fin” [a. u]. Here, the “distance from the upstream side of the radiating fin” is the distance from the most upstream side portion in the flow direction A of the coolant in each radiating fin 5 to each portion in the length direction of the radiating fin. is there.

  That is, in the case of the above-described first embodiment and as shown in FIG. 5B, when the radiating fin 5 is inclined to the downstream side in the coolant flow direction A at the aforementioned inclination angle θ, the radiating fin 5 is provided. The portion on the most upstream side in the flow direction A of the cooling liquid in this is the base portion of the radiating fin 5 in contact with the first surface portion 41 of the heat sink base member 4. It means the distance from the root portion of the fin 5 to each part in the length direction of the heat radiating fin 5 extending inclined toward the downstream side in the coolant flow direction A. On the other hand, as shown in FIG. 5C, when the radiating fin 5 is inclined to the upstream side in the coolant flow direction A at the aforementioned inclination angle θ, Since the most upstream side portion is the tip portion opposite to the root portion of the radiating fin 5, the “distance from the upstream side of the radiating fin” refers to the radiating fin 5 from the tip portion opposite to the root portion of the radiating fin 5. It means the distance to each part in the length direction.

  In FIG. 5A, the solid line X indicates that the radiating fin 5 is inclined at an inclination angle θ toward the downstream side in the coolant flow direction A as shown in the first embodiment of the present invention and FIG. 5B. The heat dissipation characteristic of the heat dissipation fin is shown. The broken line Y indicates the heat radiation characteristics of the heat radiation fin when the heat radiation fin 5 is inclined at the inclination angle θ toward the upstream side in the coolant flow direction A as shown in FIG. 5C. From the comparison between the heat dissipation characteristic X and the heat dissipation characteristic Y shown in FIG. 5C, the heat transfer coefficient in each part of the heat dissipation fin is not limited to the flow of the coolant regardless of the distance from the upstream in the flow direction A of the coolant. Embodiment 1 inclined toward the downstream side in the direction A and the heat radiation fin shown in FIG. 5B heat more than the heat radiation fin inclined toward the upstream side in the flow direction A of the coolant. It can be seen that the transmission rate is high and the heat dissipation performance is excellent.

  The heat dissipating fin 5 in the liquid-cooled cooler according to the first embodiment of the present invention described above is made by cutting, forging, die casting, 3D printer, etc., using a good heat conductive material such as aluminum, copper, ceramics, etc. Can be manufactured.

  Further, in the initial stage of manufacturing the heat radiating fin, the heat radiating fin is formed vertically on the first surface portion of the heat sink base member, and then an external force is applied to the vertically formed heat radiating fin to downstream of the coolant flow direction. You may make it manufacture the radiation fin 5 by making it incline toward the side.

  The heat sink base member 4 may be provided with irregularities in the region where the heat dissipating fins 5 do not exist in the first surface portion 41 so as to disturb the flow of the cooling liquid to improve the heat dissipating capability. The inclination angle θ of the fin 5 may be changed in accordance with the position of the radiation fin 5 on the first surface portion 41 of the heat sink base member 4.

Embodiment 2. FIG.
Next, a liquid cooling cooler according to Embodiment 2 of the present invention will be described. In the liquid-cooled cooler according to Embodiment 2 of the present invention, the shape of the radiation fins is a triangular prism, square prism, or hexagonal prism, and the side surfaces of the individual radiation fins are arranged in parallel with the side surfaces of other adjacent radiation fins. It is characterized by doing so. Other configurations are the same as those in the first embodiment.

  FIG. 6 is an explanatory view showing heat radiating fins in the liquid cooling cooler according to the second embodiment of the present invention. In FIG. 6, the individual heat radiation fins 501 provided on the first surface portion 41 (see FIGS. 1 to 4) of the heat sink base member 4 have a triangular cross section perpendicular to the length direction. It is composed of a triangular prism, and is disposed such that adjacent fin surfaces 501a of adjacent heat dissipating fins 501 are parallel to each other. The coolant flows in the direction of arrow A. Each radiating fin 501 is inclined at an inclination angle θ toward the flow direction A of the coolant. Other configurations are the same as those in the first embodiment.

  FIG. 7 is an explanatory view showing a modified example of the radiation fins in the liquid cooling cooler according to the second embodiment of the present invention. In FIG. 7, the heat radiation fin 502 provided on the first surface portion 41 (see FIGS. 1 to 4) of the heat sink base member 4 is a quadrangular prism whose cross section perpendicular to the length direction is a square shape. The fin surfaces 502a of the adjacent radiating fins 502 facing each other are arranged in parallel to each other. The coolant flows in the direction of arrow A. Each radiating fin 502 is inclined at an inclination angle θ toward the flow direction A of the coolant. Other configurations are the same as those in the first embodiment.

  FIG. 8 is an explanatory view showing still another modified example of the radiation fins in the liquid cooling cooler according to the second embodiment of the present invention. In FIG. 8, the heat dissipating fin 503 provided on the first surface portion 41 (see FIGS. 1 to 4) of the heat sink base member 4 is a hexagonal column whose cross section perpendicular to the length direction is a hexagonal shape. The fin surfaces 503a facing each other of the adjacent radiating fins 503 are arranged in parallel to each other. The coolant flows in the direction of arrow A. Each radiating fin 503 is inclined at an inclination angle θ toward the coolant flow direction A. Other configurations are the same as those in the first embodiment.

  According to the liquid cooling cooler according to the second embodiment shown in FIGS. 6, 7, and 8, the heat sink base member 4 in the heat radiation fins 501, 502, and 503 is the same as in the first embodiment. The coolant contacting the fin surface having an obtuse angle with the first surface portion 41 not only changes the flow direction in a direction parallel to the first surface portion 41 of the heat sink base member 4 but also the heat sink. The direction of the flow is also changed in a direction perpendicular to the first surface portion 41 of the heat sink base member 4 so as to be away from the first surface portion 41 of the base member 4. Further, in the heat radiation fins 501, 502, and 503, the coolant that comes into contact with the fin surface having an acute angle with the first surface portion 41 of the heat sink base member 4 is removed from the first surface portion of the heat sink base member 4. In addition to changing the direction of flow in a direction parallel to 41, the direction of flow is also perpendicular to the first surface portion 41 of the heat sink base member 4 so as to approach the first surface portion 41 of the heat sink base member 4. Change the direction of the flow.

  Therefore, the coolant is sufficiently agitated in both directions parallel and perpendicular to the first surface portion 41 of the heat sink base member 4. Therefore, the radiation fins 501, 502, and 503 need only be provided on the heat sink base member 4 to which the heat generating elements are fixed, and do not need to be provided on the bottom 71 of the water jacket 7. Therefore, the liquid cooling cooler can be downsized.

  As described above, if the shape of the radiating fin is a triangular prism, a quadrangular prism, or a hexagonal prism, the side surfaces and the side surfaces of adjacent radiating fins can be arranged in parallel by adjusting the dimensions. The fact that the side surfaces of adjacent radiating fins are parallel means that the gap between the adjacent radiating fins and the radiating fins is kept constant, and the flow rate of the coolant flowing between the adjacent radiating fins and radiating fins Is kept constant. For example, when the minimum gap size between adjacent heat sink fins is defined, the gap between all adjacent heat sink fins and heat sink fins is set to the minimum gap size, so that The flow rate of the coolant flowing between the fins can be maximized within dimensional constraints. Since the heat dissipating capacity of the heat dissipating fins increases as the flow rate of the coolant increases, the cooling performance of the liquid cooling cooler according to the second embodiment of the present invention increases.

Embodiment 3 FIG.
Next, a method for manufacturing a heat radiating fin in a liquid-cooled cooler according to Embodiment 3 of the present invention will be described. The manufacturing method of the radiation fin in the liquid cooling cooler by Embodiment 3 is characterized by manufacturing a radiation fin using the cutting tool which has several circular blades from which a diameter differs, It is characterized by the above-mentioned Embodiment 1. And, like the heat radiation fin in the liquid cooling cooler according to the second embodiment, the heat radiation fin is generally inclined from the first surface portion of the heat sink base member toward the downstream side in the coolant flow direction. This is a method for manufacturing heat dissipating fins in a liquid cooling cooler.

  9 and 10 are explanatory views showing a method of manufacturing the heat dissipating fins of the liquid cooling cooler according to the third embodiment of the present invention. First, as shown in FIG. 9, a heat sink base member 4 made of a heat-conductive material such as aluminum, copper, ceramics, etc. is subjected to a predetermined thickness dimension, a predetermined vertical width dimension, a predetermined horizontal width by extrusion or the like. A plate-shaped radiating fin region 510 having a dimension is formed. The heat sink base member 4 has a plate thickness including the heat radiation fin area 510 in advance, and a plate-shaped heat radiation fin area 510 having a predetermined thickness dimension, a predetermined vertical width dimension, and a predetermined horizontal width dimension is formed by cutting or the like. You may make it do.

  Next, a cutting tool 200 in which a plurality of circular blades 141, 142, and 143 having different diameters shown in FIG. 10 are arranged at predetermined intervals on the shaft 15 is used, among the arrows D and E shown in FIG. In either direction, the radiating fin region 510 is cut at a predetermined inclination angle to form inclined grooves with a predetermined interval. Next, in the other direction of the arrows D and E, the radiating fin region 510 is cut at a predetermined inclination angle using the cutting tool 200 to form inclined grooves with a predetermined interval. In this way, by forming the inclined grooves in the radiating fin region 510 in both directions of arrows D and E, the radiating fins 505 shown in FIG. 10 are formed.

  As shown in FIG. 10, the cutting tool 200 is formed by fixing a plurality of circular blades 141, 142, and 143 having different diameters to the shaft 15 at a predetermined interval and at an equal interval. By rotating the shaft 15 at an inclination angle θ, a plurality of inclined fins 505 can be easily manufactured by forming a plurality of inclined grooves at the same time in the radiating fin region 510. I can do it.

Embodiment 4 FIG.
In the manufacturing method of the heat radiating fin in the liquid cooling cooler according to the above-described third embodiment, the heat radiating fin is entirely inclined from the first surface portion of the heat sink base member toward the downstream side in the flow direction of the cooling liquid. The present invention relates to a method of manufacturing a radiating fin in a liquid-cooled cooler, and is characterized in that a radiating fin is manufactured using a cutting tool having a plurality of circular blades having different diameters. However, when the number of circular blades is increased, a circular blade having a very large diameter or a circular blade having a very small diameter is required. In consideration of workability, it is impossible to use a circular blade having an excessively large diameter or a circular blade having an excessively small diameter, so there is a practical limit to the number of circular blades having different diameters. The number of grooves that can be processed is limited.

  The liquid-cooled cooler according to the fourth embodiment of the present invention and the method for manufacturing the radiating fin in the liquid-cooled cooler solve the above-described problems in the method for manufacturing the radiating fin according to the third embodiment. A liquid-cooled cooler having a heat-radiating fin that can be efficiently manufactured using a cutting tool having a plurality of circular blades having the same diameter, and a heat-radiating fin in the liquid-cooled cooler A manufacturing method is provided.

  First, a liquid cooling cooler according to Embodiment 4 of the present invention will be described. In the liquid-cooled cooler according to Embodiment 4 of the present invention, the radiating fins are inclined with respect to the first surface portion of the heat sink base member, and the inclined portion is perpendicular to the first surface portion of the heat sink base member. It is characterized by comprising an upright portion extending. Other configurations are the same as those of the first embodiment or the second embodiment.

  FIG. 11 is a perspective view showing a heat sink of a liquid cooling cooler according to Embodiment 4 of the present invention, and FIG. 12 is a side view showing the heat sink of the liquid cooling cooler according to Embodiment 4 of the present invention. 11 and 12, individual radiating fins 504 provided on the first surface portion 41 of the heat sink base member 4 are aligned as a radiating fin row group as in the first embodiment. Also, they are arranged as a group of radiating fins. The radiating fin 504 is configured by a triangular prism as shown in FIG. 6 in the second embodiment. Of course, the shape may be other than the triangular prism.

  As shown in FIG. 12, the individual radiating fins 504 include an inclined portion 504 a formed at a portion in contact with the first surface portion 41 of the heat sink base member 4, that is, a root portion of the radiating fin 504. The upright portion 504b extends perpendicularly to the first surface portion 41 of the heat sink base member 4 from the inclined portion 504a. The inclined portion 504a of the radiating fin 504 is inclined toward the downstream side in the coolant flow direction A at an inclination angle θ. The upright portion 504b of the heat radiating fin is configured by a portion other than the inclined portion 504a.

  Since the temperature distribution of the coolant is likely to be particularly high in the portion close to the heat sink base member 4, the inclined portion 504 a is provided at the root portion of the heat radiation fin 504, and the cooling that circulates in the vicinity of the first surface portion 41 of the heat sink base member 4 is performed. The cooling performance of the liquid cooling cooler is improved by mainly stirring the liquid.

  Next, a method for manufacturing a heat radiating fin in a liquid-cooled cooler according to Embodiment 4 of the present invention will be described. A method for manufacturing a heat radiating fin according to Embodiment 4 of the present invention is a method for manufacturing a heat radiating fin in the liquid cooling cooler shown in FIGS. The protrusions are formed by extruding or the like, and then the protrusions are cut in a direction perpendicular to the surface portion of the heat sink base member by a plurality of circular blades having the same diameter, so that the heat radiation fins are formed. It is characterized by manufacturing.

  When the comb-like ridge formed by extrusion or the like has only an inclined portion, when cutting with a circular blade in a direction perpendicular to the surface portion of the heat sink base member, many of the ridges Although the site is cut off and only the root portion remains, according to the fourth embodiment of the present invention, the inclined ridge portion is formed on the root portion connected to the surface portion of the heat sink base member. And an upstanding ridge extending in a direction perpendicular to the surface of the heat sink base member from the inclined ridge, and is cut in a direction perpendicular to the surface of the heat sink base member with a circular blade. However, the radiation fin provided with the inclined ridge portion and the upright ridge portion of the root portion is formed.

  FIG. 13 is a perspective view for illustrating a method for manufacturing a heat dissipation fin of a liquid-cooled cooler according to Embodiment 4 of the present invention. First, as shown in FIG. 13, the heat sink base member 4 made of a heat-conductive material such as aluminum, copper, or ceramics is extruded on the first surface portion 41 of the heat sink base member 4 in the row direction. Continuously extending ridges 500 are formed by being aligned in the row direction at a predetermined interval. As shown in FIG. 12, the ridge body 500 that is continuous in the row direction includes an inclined ridge portion 500 a that is inclined at an inclination angle θ at a portion in contact with the first surface portion 41 of the heat sink base member 4, and the inclined protrusion. The upright protrusion 500b extends perpendicularly to the first surface 41 of the heat sink base member 4 from the stripe 500a.

  Next, as shown in FIG. 13, an arrow B direction and an arrow C are formed by using a cutting tool in which a plurality of circular blades having the same diameter are arranged at equal intervals in a protrusion 500 formed in a comb shape. A plurality of grooves having a predetermined width are formed at equal intervals in any one of the directions. Next, grooves having a predetermined width are formed at equal intervals in the other direction of the arrow B direction and the arrow C direction. Here, the plurality of circular blades having the same diameter cut the upright ridge portion 500 b of the ridge body 500 perpendicularly to the first surface portion 41 of the heat sink base member 4. By this cutting process, the heat sink 40 in which the individual radiation fins 504 shown in FIG. 11 are formed can be manufactured.

  In the liquid cooling cooler according to the fourth embodiment of the present invention, the method for manufacturing a heat radiating fin is not limited by the number of circular blades as in the third embodiment. By increasing the number, the heat radiation fins can be manufactured very efficiently and easily.

  In the present invention, the embodiments can be appropriately modified or omitted within the scope of the invention.

DESCRIPTION OF SYMBOLS 100 Liquid cooling cooler, 1st heat generating element, 2nd heat generating element, 3rd heat generating element, 40 heat sink, 4 heat sink base member, 41 1st surface part, 42 2nd surface part, 500 protrusion Body, 500a inclined ridge, 500b upright ridge, 5, 501, 502, 503, 504, 505 radiating fin, 501a, 502a, 503a fin surface, 504a inclined portion, 504b upright, 50a first gap, 50b second gap, 51 first ridge line, 52 second ridge line, 53 first fin surface, 54 second fin surface, 55 third fin surface, 56 fourth fin surface, 6 coolant passage 7 Water jacket, 71 Bottom portion, 72 Perimeter wall portion, 721, 722 Short side portion, 723, 724 Long side portion, 8 Coolant inlet pipe, 9 Coolant outlet pipe, 510 Radiation fin area, 200 Cutting tool, 141, 142, 143 Circular blade

Claims (5)

A jacket that circulates the coolant in the interior; and a heat sink that contacts the coolant that circulates in the jacket; and the heat generated by the heating element is transmitted to the coolant via the heat sink to dissipate heat. A liquid cooling cooler,
The heat sink is
A heat sink base member having a first surface facing the inside of the jacket;
A plurality of heat dissipating fins provided on the first surface portion of the heat sink base member and in contact with the coolant flowing through the jacket;
With
The plurality of heat dissipating fins are constituted by pillars whose cross section is substantially a regular triangle, whose cross section is a regular square, or whose cross section is a regular hexagon, and the direction in which the pillars extend is the jacket. Is inclined toward the downstream side of the coolant flowing through the interior of the
The side surface of the radiation fin is parallel to the side surface of another adjacent radiation fin.
Is configured to,
The plurality of heat dissipating fins are further in contact with the first surface portion of the heat sink base member and are inclined toward the downstream side of the coolant flowing through the inside of the jacket, and the first from the inclined portion. An upright portion that stands upright against the surface portion of the
A liquid cooling cooler characterized by that. A jacket that circulates the coolant inside, and a heat sink that contacts the coolant that circulates inside the jacket, the heat sink having a first surface portion facing the inside of the jacket; and A plurality of heat dissipating fins provided on the first surface portion of the heat sink base member and in contact with the coolant flowing through the jacket; and the plurality of heat dissipating fins flow through the jacket. A radiating fin in a liquid cooling cooler configured to be inclined toward the downstream side of the cooling liquid, wherein the heat generated by the heating element is transmitted to the cooling liquid via the heat sink and radiated. A manufacturing method of
On the first surface portion of the heat sink base member, a plate-like radiating fin region protruding from the first surface portion with a predetermined dimension is formed.
A plurality of circular blades having different diameters arranged at predetermined intervals are rotated, and the plurality of radiating fins are simultaneously cut by the plurality of circular blades at an angle inclined with respect to the first surface portion. Form,
The manufacturing method of the radiation fin in the liquid cooling cooler characterized by the above-mentioned. The radiating fin is constituted by a triangular prism, a quadrangular prism, or a hexagonal prism,
The side surface of the radiation fin is parallel to the side surface of another adjacent radiation fin.
The method for producing a heat radiating fin in a liquid-cooled cooler according to claim 2 . The triangular prism has a substantially equilateral triangle in cross section,
The square column has a substantially square shape in cross section,
The hexagonal column has a substantially regular hexagonal cross section,
The method for manufacturing a heat radiating fin in the liquid cooling cooler according to claim 3. A jacket that circulates the coolant inside, and a heat sink that contacts the coolant that circulates inside the jacket, the heat sink having a first surface portion facing the inside of the jacket; and A plurality of heat dissipating fins provided on the first surface portion of the heat sink base member and in contact with the coolant flowing through the inside of the jacket, the heat dissipating fins having a substantially equilateral triangle in cross section Or, the cross section is constituted by a column having a substantially square shape or a cross section having a substantially regular hexagonal shape, and the extending direction of the column is inclined toward the downstream side of the coolant flowing through the jacket. The side surfaces of the heat radiating fins are configured to be parallel to the side surfaces of other adjacent heat radiating fins, and the plurality of heat radiating fins are configured. Is further in contact with the first surface portion of the heat sink base member and inclined toward the downstream side of the coolant flowing through the inside of the jacket, and from the inclined portion to the first surface portion. A heat-radiating fin manufacturing method for a liquid-cooled cooler, wherein the heat generated by the heating element is transferred to the cooling liquid via the heat sink to dissipate heat. There,
On the first surface portion of the heat sink base member, a plurality of protrusions arranged in parallel with each other and protruding from the first surface portion with a predetermined dimension are formed.
The plurality of ridges are provided in contact with the first surface portion, are inclined in a predetermined direction with respect to the first surface portion, and are provided in contact with the inclined ridge portion and the inclined ridge portion, An upright ridge that stands upright with respect to the first surface,
By cutting the plurality of protrusions, the plurality of radiation fins are formed.
Method of manufacturing in the heat radiation fins to the liquid-cooling cooler you wherein a.

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