JP2019179836A - Cooling device - Google Patents

Abstract

To provide a cooling device with improved cooling effect.SOLUTION: A cooling device 1 includes: a cold plate which contacts with a heating component H on its lower surface and has a refrigerant passage in which a refrigerant circulates; a radiator having cooling fins and multiple pipes which are connected with the refrigerant passage and in which the refrigerant circulates; and a pump which circulates the refrigerant. The multiple pipes are connected in parallel to each other and have extension parts 23a extending along an upper surface of the cold plate above the cold plate. Positions of lower ends of at least two of the extension parts 23a are different from each other in a vertical direction.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a cooling device.

  A conventional cooling device is disclosed in Patent Document 1. This element cooling apparatus includes a large number of fin members, a heat receiving plate on which the element to be cooled is mounted, and a plurality of pipe members in which hydraulic fluid is sealed. A cooling fan is disposed above the fin member. The cooling air blown from the cooling fan is guided by the guide duct and flows to the inlet of the ventilation duct. The cooling air circulates from the central part of each fin member to both sides. Thereby, the heat transmitted to one side of each fin member by the cooling air is radiated into the cooling air.

Japanese Patent Laid-Open No. 11-307703

  However, in the element cooling device disclosed in the above-mentioned patent document, when the cooling air branches and flows from the center of each fin member to both sides, the cooling air collides with the pipe member, and the cooling air flows through the entire fin member. There was a difficult task.

  An object of this invention is to provide the cooling device which improved the cooling effect.

  An exemplary cooling device of the present invention comprises a cold plate, a radiator, and a pump. The cold plate has a refrigerant flow path through which a refrigerant flows while the heat generating component and the lower surface are in contact with each other. The radiator includes cooling fins and a plurality of pipes that are connected to the refrigerant flow path and through which the refrigerant flows. The pump circulates the refrigerant. The plurality of pipes are connected in parallel and have an extending portion that extends along the upper surface of the cold plate above the cold plate, and the positions of the lower ends of at least two of the extending portions are in the vertical direction. Different.

  According to the exemplary present invention, a cooling device with enhanced cooling effect can be provided.

FIG. 1 is a perspective view of a cooling device according to a first embodiment of the present invention. FIG. 2 is a perspective view of the cooling device according to the first embodiment of the present invention. FIG. 3 is a top view of the cooling device according to the first embodiment of the present invention. 4 is a cross-sectional view taken along line AA in FIG. FIG. 5 is a bottom view showing the upper wall portion of the cooling device according to the first embodiment of the present invention. FIG. 6 is a top view showing the bottom wall portion of the cooling device according to the first embodiment of the present invention. FIG. 7 is a cross-sectional view of a cooling device according to a modification of the first embodiment of the present invention. FIG. 8 is a cross-sectional view of a cooling device according to a modification of the first embodiment of the present invention. FIG. 9 is a perspective view of a cooling device according to the second embodiment of the present invention.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the present application, the direction in which the radiator 20 is disposed with respect to the cold plate 10 is referred to as “upper side”, and the opposite side of the direction in which the radiator 20 is disposed is referred to as “lower side”. Further, in the present application, the direction in which the radiator 20 is disposed with respect to the cold plate 10 is referred to as “vertical direction”, and the direction orthogonal to the “vertical direction” is referred to as “horizontal direction”. Will be explained. However, this only defines the vertical direction and the horizontal direction for the convenience of explanation, and does not limit the orientation of the cooling device 1 according to the present invention during manufacture and use.

  Further, in the present application, the “parallel direction” includes a substantially parallel direction. Further, in the present application, the “perpendicular direction” includes a substantially orthogonal direction.

<First Embodiment>
(1. Configuration of the cooling device)
A cooling device according to an exemplary embodiment of the present invention will be described. 1 and 2 are perspective views of the cooling device 1 according to the embodiment of the present invention, and FIG. 2 shows a state in which the fins 21 are omitted. 3 is a perspective view of the cooling device 1, and FIG. 4 is a cross-sectional perspective view taken along line AA in FIG.

  The cooling device 1 includes a cold plate 10, a radiator 20, and a pump 30. The radiator 20 is disposed on the cold plate 10. The lower surface of the radiator 20 is in contact with the upper surface of the cold plate 10. The cold plate 10 is in contact with the heat generating component H and the lower surface. Inside the cold plate 10 is formed a refrigerant flow path 11 through which the refrigerant flows. The pump 30 circulates the refrigerant in the cooling device 1. The pump 30 is disposed in the refrigerant flow path 11 (see FIG. 5). Thereby, the cold plate 10, the radiator 20, and the pump 30 can be integrated, and the whole cooling device 1 can be reduced in size.

  The cold plate 10 is made of a metal having high thermal conductivity such as copper or aluminum. The cold plate 10 has a bottom wall portion 12, an upper wall portion 13 and a side wall portion 14. In the present embodiment, the cold plate 10 is rectangular in a top view. That is, the bottom wall portion 12 and the top wall portion 13 are plate-shaped that expands in the horizontal direction when viewed from above. Note that the bottom wall portion 12 and the upper wall portion 13 of the present embodiment are square when viewed from the top, but are not limited thereto, and may be, for example, a polygon having a plurality of corners when viewed from the top or a circle. The heat generating component H contacts the lower surface of the bottom wall portion 12.

  The side wall part 14 connects the peripheral edges of the bottom wall part 12 and the upper wall part 13. The side wall part 14 has a first side wall part 14 a extending upward from the peripheral edge of the bottom wall part 12 and a second side wall part 14 b extending downward from the peripheral edge of the upper wall part 13. The upper surface of the 1st side wall part 14a and the lower surface of the 2nd side wall part 14b are joined.

  The refrigerant flow path 11 is formed in an internal space surrounded by the bottom wall portion 12, the upper wall portion 13 and the side wall portion 14. A plurality of blades 12 a arranged side by side are provided inside the refrigerant flow path 11. The refrigerant flows into the refrigerant flow path 11 through the inlet 14c and flows out of the refrigerant flow path 11 through the outlet 14d. In this embodiment, the some inflow port 14c and the outflow port 14d are provided in the side wall part 14 (refer FIG. 5).

  The refrigerant flows into the refrigerant flow path 11 through the inlet 14c in the horizontal direction, then passes between the plurality of blades 12a, and flows out through the outlet 14d in the horizontal direction. In the present embodiment, the refrigerant is a liquid, and for example, an antifreeze liquid such as an ethylene glycol aqueous solution or a propylene glycol aqueous solution, pure water, or the like is used.

  The radiator 20 includes a plurality of pipes 23 and cooling fins 21. The pipe 23 communicates with the refrigerant flow path 11. Five pipes 23 are arranged at equal intervals in the short direction Y of the cold plate 10, and the five pipes 23 are connected to the cold plate 10 in parallel. Thereby, heat is transmitted from each pipe 23 to the fins 21, and the refrigerant can be efficiently cooled.

  The pipe 23 has an extending part 23a and a connecting part 23b. The extending portion 23 a is disposed above the cold plate 10 and extends along the upper surface of the cold plate 10. That is, the extending part 23a extends linearly in the longitudinal direction X. The positions of the lower ends of the at least two extending portions 23a are different in the vertical direction. Thereby, when cooling air is blown in the arrangement direction (short direction Y) of the pipes 23, the surface area directly contacting with the cooling air is increased in at least two extending portions 23 a. Therefore, the cooling performance of the radiator 20 is improved and the cooling effect of the cooling device 1 is enhanced.

  The connecting portion 23b is bent downward from both ends of the extending portion 23a, and the tip of the connecting portion 23b is connected to the inflow port 14c and the outflow port 14d. In the present embodiment, each connection portion 23b is connected to a plurality of inflow ports 14c and outflow ports 14d provided in the side wall portion 14 of the cold plate 10, respectively. The refrigerant flows horizontally between the plurality of blades 12a through the inlet 14c from the tip of the connecting portion 23b, then passes between the plurality of blades 12a, and passes through the outlet 14d in the horizontal direction. Spill from. That is, the refrigerant passes between the plurality of blades 12a in one direction. Thereby, it can pass through the refrigerant | coolant flow path 11 smoothly.

  In the present embodiment, the lower ends of the plurality of connection portions 23b are arranged at the same position in the vertical direction. Thereby, it can suppress that the height of the up-down direction of the cold plate 10 becomes large. That is, it can suppress that the cooling device 1 enlarges to an up-down direction.

  In this embodiment, the diameter of the adjacent extension part 23a is the same, and the lower end of the extension part 23a is located below in order toward the arrangement direction (short direction Y) of the pipe 23. Thereby, the cooling air directly contacts each pipe 23. Therefore, the cooling performance of the radiator 20 is further improved.

  In the present embodiment, the cooling air blown to the radiator 20 is blown in the direction of arrow D from the higher end position of the extending portion 23a toward the lower end. The cooling air blown to the radiator 20 increases in temperature toward the downstream due to heat exchange with the pipe 23 and the fins 21. Moreover, since the length of the connection part 23b becomes large and the surface area of the pipe 23 is also large as the position of the lower end of the extension part 23a becomes high, cooling performance is high. For this reason, when the cooling air is blown in the direction of arrow D from the lower end of the extending portion 23a toward the lower side, the cooling air having a lower temperature can be directly contacted in order from the pipe 23 having the larger surface area. Therefore, the cooling performance of the radiator 20 is further improved.

  The cooling air blown to the radiator 20 flows above and below the pipe 23. The cooling air flowing under the pipe 23 flows through the lower flow path R formed between the lower end of the extending portion 23 a and the upper surface of the upper wall portion 13.

  The lower flow path R gradually narrows in the direction of arrow D from the higher end to the lower end position of the extending portion 23a. That is, when cooling air is blown in the direction of arrow D, the lower flow path R on the upstream side of the cooling air is wider than the lower flow path R on the downstream side. Therefore, the cooling air flows smoothly through the lower flow path R.

  In the adjacent pipes 23, the lower end of one extending portion 23a is located above the lower end of the other extending portion 23a and below the upper end of the other extending portion 23a. Thereby, it is difficult for the cooling air flowing through the lower flow path R to escape to the outside from the gap between the adjacent extending portions 23a, and the cooling performance of the radiator 20 is further improved. Further, the plurality of pipes 23 can be arranged close to each other in the vertical direction. Thereby, it can suppress that the fin 21 enlarges to an up-down direction. That is, the enlargement of the cooling device 1 can be suppressed.

  The fin 21 is formed in a flat plate shape, and rises from the upper surface of the upper wall portion 13 and extends in the horizontal direction. In the present embodiment, the cold plate 10 has a longitudinal direction X and a short direction Y, and the plurality of fins 21 extend in the short direction Y. The plurality of fins 21 are arranged in parallel in the longitudinal direction X of the cold plate 10 at equal intervals.

  In the present embodiment, the fin 21 is a separate member from the upper wall portion 13. The lower end of the fin 21 is joined to the upper surface of the upper wall part 13 by welding. Thereby, the lower end of the fin 21 is in contact with the upper surface of the upper wall portion 13, and heat transfer from the upper wall portion 13 to the fin 21 is improved. The fin 21 and the upper wall portion 13 may be the same member. In this case, for example, the fin 21 is formed by cutting the upper surface of the upper wall portion 13. Moreover, in this embodiment, the upper end of the fin 21 is located above the upper end of the extension part 23a. Thereby, the heat transmitted from the extending part 23a to the fin 21 spreads above and below the fin 21, and the heat dissipation of the fin 21 is improved.

  The fin 21 and the pipe 23 are welded by inserting the pipe 23 into a through hole (not shown) provided in the fin 21. In the present embodiment, the fin 21 is provided only in the extending portion 23 a of the pipe 23. The fins 21 are not provided in the connection portion 23 b of the pipe 23. That is, the fin 21 is joined to the extending portion 23a, but not joined to the connecting portion 23b. Thereby, the operation | work which attaches the fin 21 to the connection part 23b bent is abbreviate | omitted, and the installation operation | work of the fin 21 is simplified.

  In the present embodiment, the fin 21 extends in a direction intersecting with the extending direction of the extending portion 23a and crosses the plurality of extending portions 23a. Thereby, the flow path of the cooling air formed between the adjacent fins 21 crosses the extending portion 23a. Therefore, the heat dissipated from the extending portion 23a is promoted by the circulating cooling air, and the cooling performance of the radiator 20 is improved.

  In the present embodiment, the extending direction of the fins 21 is orthogonal to the extending direction of the extending portion 23a. Thereby, on the cold plate 10, the several fin 21 can be closely arranged closely. Therefore, the surface area of the fins 21 as a whole can be increased and the cooling performance of the radiator 20 can be improved.

  FIG. 5 is a bottom view of the upper wall portion 13, and FIG. 6 is a top view of the bottom wall portion 12. A pump 30 is disposed on one end side of the side wall portion 14 in the short direction Y. In this embodiment, the pump 30 is a cascade pump. The pump 30 has a suction port 31a and a discharge port 31b on the other end side in the lateral direction Y. The upper wall portion 13 has a partition wall 15 that protrudes downward from the upper surface. The partition wall 15 extends from one end side in the short direction Y of the upper wall portion 13 to the other end side. The refrigerant flow path 11 has an inflow side refrigerant flow path 11a and an outflow side refrigerant flow path 11b with the partition wall 15 interposed therebetween. The suction port 31a is arrange | positioned at the inflow side refrigerant | coolant flow path 11a. Moreover, the discharge port 31b is arrange | positioned at the outflow side refrigerant | coolant flow path 11b.

  As shown in FIG. 6, a plurality of blades 12 a are provided on the upper surface of the bottom wall portion 12. The blade 12a is disposed between the suction port 31a and the inflow port 14c and between the discharge port 31b and the outflow port 14d. The plurality of blades 12a are arranged in parallel. Each blade 12a has a groove portion 12b that is disposed at the center in the longitudinal direction X and is recessed downward. The upper surface of the groove portion 12b contacts the lower end of the partition wall 15. A vertical gap S is formed between the upper end of the blade 12a and the lower surface of the upper wall portion 13 (see FIG. 4).

  The refrigerant that has flowed into the inflow side refrigerant flow path 11a through the inflow port 14c flows between the blades 12a and flows into the pump 30 from the suction port 31a. The refrigerant discharged from the discharge port 31b to the outflow side refrigerant channel 11b flows between the blades 12a and flows out from the outlet 14d. At this time, the refrigerant flows between the blades 12a and spreads to the inflow side refrigerant flow path 11a and the outflow side refrigerant flow path 11b. Thereby, the whole cold plate 10 is cooled by the refrigerant.

(2. Operation of the cooling device)
The pump 30 is driven by bringing a heat generating component H such as a CPU into contact with the lower surface of the bottom wall portion 12 of the cold plate 10. Thereby, the refrigerant circulates through the refrigerant flow path 11 and the pipe 23. Heat generated by the heat generating component H is transmitted to the bottom wall portion 12 of the cold plate 10. The heat transmitted to the bottom wall portion 12 is transmitted to the fins 21 through the upper wall portion 13 and also transmitted to the fins 21 through the refrigerant flowing through the pipe 23. Thereby, heat is radiated through the fins 21, and the temperature rise of the heat generating component H can be suppressed.

  By disposing a cooling fan (not shown) on the side of the radiator 20 and blowing cooling air in the direction of arrow D, heat dissipation from the fins 21 and the pipes 23 is promoted as described above, and the cooling performance of the radiator 20 is improved. More improved.

  7 and 8 are side sectional views showing modifications of the cooling device 1 of the present embodiment. The arrangement of the pipes 23 is not limited to the pattern of this embodiment. As shown in FIG. 7, in this modification, the pipes 23 arranged at both ends in the arrangement direction (short direction Y) of the pipes 23 are different in the position of the lower end of the extending portion 23a in the vertical direction. However, the lower ends of the extending portions 23a of some adjacent pipes 23 are arranged at the same position in the vertical direction. In this case, the surface area of the extending portion 23a that is in direct contact with the cooling air in the direction of the arrow D is larger than when the positions of the lower ends of the extending portion 23a are all the same in the vertical direction. Therefore, the cooling performance of the radiator 20 is improved.

  As shown in FIG. 8, in this modification, the lower end of the connecting portion 23b coincides with the lower end of the outlet 14d. At this time, the lower end of the uppermost connection portion 23b is positioned below the upper end of the lowermost connection portion 23b. Thereby, it can suppress that the height of the up-down direction of the cold plate 10 becomes large. That is, it can suppress that the cooling device 1 enlarges to an up-down direction. The plurality of connection portions 23b only have to be arranged at positions overlapping in the horizontal direction, and the positions of the plurality of connection portions 23b in the vertical direction may be different.

Second Embodiment
Next, a second embodiment of the present invention will be described. FIG. 9 is a perspective view of the cooling device 1 of the second embodiment, showing a state where the fins 21 are omitted. For convenience of explanation, the same reference numerals are given to the same parts as those in the first embodiment shown in FIGS. In 2nd Embodiment, the connection part 23b is each connected with the some inflow port 13a and the outflow port 13b which were provided in the upper wall part 13. As shown in FIG.

  By providing the inlet 13 a and the outlet 13 b in the upper wall portion 13, the connecting portion 23 b does not protrude to the side of the cold plate 10. For this reason, the cooling device 1 can be reduced in size.

  In the present embodiment, the lengths in the longitudinal direction X of the at least two extending portions 23a are different. Thereby, when cooling air is blown in the arrangement direction (short direction Y) of the pipes 23, the surface area of the extending portion 23a with which the cooling air directly contacts is increased. Therefore, the cooling performance of the radiator 20 is improved.

  The length in the longitudinal direction of the extending portion 23a is shortened in order toward the arrangement direction of the pipes 23 (short direction Y). As a result, the cooling air comes into direct contact with each connection portion 23 b of each pipe 23. Therefore, the cooling performance of the radiator 20 is further improved. In the present embodiment, the lower end of the extending portion 23a is positioned downward in order toward the arrangement direction of the pipes 23 (short direction Y). At this time, the position of the lower end of the extending portion 23a having the longest length in the longitudinal direction is located at the uppermost position. Thereby, the cooling air directly contacts each extending portion 23a of each pipe 23. Therefore, the cooling performance of the radiator 20 is further improved.

  In the present embodiment, the cooling air blown to the radiator 20 is blown in the direction of the arrow D from the longer side in the longitudinal direction X of the extending portion 23a toward the shorter side. Thereby, the cooling air with a lower temperature can be directly contacted in order from the pipe 23 with the larger surface area. Therefore, the cooling performance of the radiator 20 is further improved.

  The lower flow path R is gradually narrowed in the direction of the arrow D from the longer part in the longitudinal direction X to the shorter part in the longitudinal direction X. That is, when cooling air is blown in the direction of arrow D, the lower flow path R on the upstream side of the cooling air is wider than the lower flow path R on the downstream side. As a result, the cooling air smoothly flows through the lower flow path R.

  Next, the effects of the present invention will be specifically described using examples and comparative examples. Table 1 shows the results of evaluating the height of the lower end of the plurality of extending portions 23 a and the cooling performance of the cooling device 1.

  The cooling devices according to Examples 1 and 2 and Comparative Example 1 below were the same devices as in the first embodiment.

  The second embodiment uses the same cooling device 1 as the first embodiment, and the blowing direction is different as will be described later.

[Comparative Example 1]
In the pipe 23 according to the comparative example 1, all the positions of the lower ends of the extending portions 23a are arranged at the same height.

[Measurement of thermal resistivity]
Table 1 shows the results of preparing the cooling devices according to Example 1, Example 2, and Comparative Example 1 and measuring the thermal resistivity R (K / W). The cooling air was blown in a direction (short direction Y) perpendicular to the direction in which the pipe 23 extends.

  In Example 1, cooling air was blown from the higher end of the extending portion 23a toward the lower end. Further, in Example 2, cooling air was blown from the lower end of the extending portion 23a toward the higher end.

  The thermal resistivity R was measured by bringing a heat source into contact with the lower surface of the cold plate 10. The thermal resistivity R was calculated by R = ΔT / ΔQ from the temperature increase ΔT on the lower surface of the cold plate 10 with respect to the calorific value ΔQ per unit time.

[Evaluation of cooling performance]
As shown in Table 1, when the positions of the lower ends of at least two extending portions 23a are different in the vertical direction, the thermal resistivity R is reduced as compared with the case where the positions of the lower ends of the extending portions 23a are at the same height. Confirmed to do. Further, the cooling device 1 according to the first embodiment that blows the cooling air from the lower end of the extending portion 23a toward the lower side is cooled from the lower end of the extending portion 23a toward the higher end. It was confirmed that the thermal resistance R was low compared to the cooling device 1 according to Example 2 in which wind was blown, and the cooling performance of the cooling device 1 was high.

(3. Other)
The above embodiments are merely examples of the present invention. The configuration of the embodiment may be appropriately changed without departing from the technical idea of the present invention. Further, the embodiments may be implemented in combination within a possible range.

  In the above embodiment, the pump 30 is disposed in the refrigerant flow path 11, but may be disposed adjacent to the outside of the cold plate 10.

  DESCRIPTION OF SYMBOLS 1 ... Cooling device, 10 ... Cold plate, 11 ... Refrigerant flow path, 11a ... Inflow side refrigerant flow path, 11b ... Outflow side refrigerant flow path, 12 ... Bottom wall part, 12a ... Blade, 12b ... Groove, 13 ... Upper wall, 13a, 14c ... Inlet, 13b, 14d ... Outlet, 14 ... Side wall, 14a ... No. 1 side wall part, 14b ... 2nd side wall part, 15 ... partition wall, 20 ... radiator, 21 ... fin, 22 ... refrigerant flow path, 23 ... pipe, 23a ... Extension part, 23b ... Connection part, 30 ... Pump, 31a ... Suction port, 31b ... Discharge port, D ... Arrow, H ... Heat generating component, R ... Lower stage flow Road, S ... Gap, X ... Longitudinal direction, Y ... Short direction

Claims (14)

A cold plate having a refrigerant flow path in which the heat generating component and the lower surface are in contact and in which the refrigerant flows;
A radiator having cooling fins and a plurality of pipes connected to the refrigerant flow path and through which the refrigerant flows;
A pump for circulating the refrigerant,
The plurality of pipes are connected in parallel and have an extending portion that extends along the upper surface of the cold plate above the cold plate,
The cooling device in which positions of lower ends of at least two of the extending portions are different in the vertical direction.   2. The cooling device according to claim 1, wherein the pipes arranged at both ends in the arrangement direction of the pipes differ in the position of the lower end of the extending portion in the vertical direction.   2. The cooling device according to claim 1, wherein lower ends of the plurality of extending portions are sequentially positioned downward in the arrangement direction of the pipes.   In the adjacent pipes, the lower end of one of the extending portions is located above the lower end of the other extending portion and below the upper end of the other extending portion. Item 4. The cooling device according to any one of Items 3 to 5. Each of the pipes has a connecting portion that bends downward from both ends of the extending portion,
Each said connection part is a cooling device in any one of Claims 1-4 connected with the some inflow port provided in the side wall part of the said cold plate, and an outflow port, respectively. In the plurality of connection portions, the lower end of the connection portion located at the uppermost position is located below the upper end of the connection portion located at the lowermost position.
Or
The cooling device according to claim 5, wherein lower ends of all the connection portions are arranged at the same position in the vertical direction. Each of the pipes has a connecting portion that bends downward from both ends of the extending portion,
The cooling device according to any one of claims 1 to 4, wherein each of the connection portions is connected to a plurality of inlets and outlets provided on an upper wall portion of the cold plate.   The cooling device according to claim 7, wherein at least two of the extending portions have different longitudinal lengths.   The cooling device according to claim 7, wherein a length in a longitudinal direction of the extending portion is sequentially shortened in an arrangement direction of the pipes.   The said fin is a cooling device in any one of Claims 5-9 provided only in the said extension part among the said pipes.   The cooling device according to any one of claims 1 to 10, wherein the fin extends in a direction intersecting with a direction in which the extension portion extends and crosses the plurality of extension portions.   The cooling device according to any one of claims 1 to 11, wherein an upper end of the fin is positioned above an upper end of the extending portion.   The cooling device according to any one of claims 1 to 12, wherein a lower end of the fin is positioned below a lower end of the extending portion and is in contact with an upper surface of the cold plate. The extending portion extends linearly,
The cooling device according to any one of claims 1 to 13, wherein a direction in which the fin extends and a direction in which the extending portion extends are orthogonal to each other.

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