JP2016096272A - Cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a coolant flow with desired flow velocity distribution on the rear side of a radiator.SOLUTION: A cooler 3 includes a frame 1 and radiator that define an internal space in which a passage for making a coolant flow is formed. The passage is formed so that a flow direction of a coolant lead in the internal space changes at the time of the coolant flowing into the rear side of the radiator; and has part at which passage cross section area changes in order to adjust flow velocity distribution of the coolant flowing on the rear side of the radiator.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cooler.

  As a conventional cooler, there is one in which a passage for flowing a refrigerant is formed in an internal space partitioned by a radiator and a casing (see Patent Document 1).

JP 2006-1000029 A

  However, in the conventional cooler described above, the flow direction of the refrigerant introduced from the water pipe connector into the cooler is perpendicular to the flow direction of the refrigerant flowing on the back side of the radiator. Therefore, a large amount of refrigerant introduced into the cooler from the water pipe connector flows to the back side with respect to the front side of the refrigerant introduction direction due to the inertia of the refrigerant, and then the flow direction is changed by 90 degrees to It will flow on the back side. As a result, the flow velocity of the refrigerant flowing on the back side of the heat radiating body was faster on the back side than on the front side in the refrigerant introduction direction.

  Thus, in the conventional cooler, the flow velocity distribution of the refrigerant flowing on the back side of the radiator is inevitably determined according to the change in the refrigerant flow direction. For example, the flow velocity distribution is uniform, for example, by making the flow velocity distribution uniform. It did not consider adjusting so that it might become desired flow rate distribution.

  The present invention has been made paying attention to such points, and even when the flow direction of the refrigerant changes in the cooler, the desired flow velocity distribution is provided on the back side of the radiator regardless of the change in the flow direction. The purpose is to allow the refrigerant to flow.

  According to an aspect of the present invention, there is provided a cooler in which a passage for flowing a refrigerant is formed in an internal space defined by a heat radiator and a casing. In this cooler, the passage through which the refrigerant flows is formed so that the flow direction of the refrigerant changes when the refrigerant introduced into the internal space flows into the back side of the radiator, and the refrigerant flowing through the back side of the radiator. In order to adjust the flow velocity distribution, the passage cross-sectional area changes.

  According to this aspect, by changing the passage cross-sectional area of the passage through which the refrigerant introduced into the cooler flows, the flow resistance of the refrigerant flowing through the passage is adjusted, and the refrigerant flows through the portion where the passage cross-sectional area is changed. The flow rate can be adjusted. As a result, when the refrigerant introduced into the cooler changes the flow direction and flows into the back side of the radiator, the flow rate of the refrigerant flowing into the back side of the radiator is also adjusted. The refrigerant can be flowed with a flow velocity distribution.

FIG. 1 is a front view of a cooler according to a first embodiment of the present invention. FIG. 2 is a front sectional view of the cooler. FIG. 3 is a perspective view of the housing. FIG. 4 is a top view of the housing. FIG. 5 is a top view of the casing of the cooler according to the modification of the first embodiment of the present invention. FIG. 6 is a top view of the casing of the cooler according to the second embodiment of the present invention. FIG. 7 is a cross-sectional view of the cooler along the line VII-VII in FIG. FIG. 8 is a top view of the casing of the cooler according to the third embodiment of the present invention. FIG. 9 is a cross-sectional view of the cooler along the line IX-IX in FIG. FIG. 10 is a top view of the casing of the cooler according to the fourth embodiment of the present invention. FIG. 11 is a cross-sectional view of the cooler along the line XI-XI in FIG. FIG. 12 is a view showing a casing of a cooler according to a modification of the first embodiment of the present invention. FIG. 13 is a view showing a casing of a cooler according to a modification of the first embodiment of the present invention. FIG. 14 is a diagram showing a casing of a cooler according to a modification of the first embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a front view of a cooler 3 according to a first embodiment of the present invention that includes a housing 1 and a heat sink (heat radiator) 2. FIG. 2 is a front sectional view of the cooler 3. FIG. 3 is a perspective view of the housing 1. Hereinafter, the cooler 3 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

  As shown in FIGS. 1 to 3, the cooler 3 includes a housing 1 whose upper surface is open, and a heat sink 2 as a lid body fixed to the housing 1 so as to close the opening. A heating element 100 that is cooled by the cooler 3 is mounted on the surface of the heat sink 2.

  A convex portion 4 that protrudes from the bottom wall 1 e of the housing 1 toward the heat sink 2 is provided inside the housing 1. An inlet 5 for introducing cooling water (refrigerant) into the internal space of the cooler 3 partitioned by the casing 1 and the heat sink 2 on one of the side walls 1a to 1d of the casing 1; A discharge port 6 is provided for discharging the cooling water introduced into the internal space of the cooler 3 from the internal space.

  In the internal space of the cooler 3, cooling water introduced from the introduction port 5 flows to the back side of the heat sink 2, and then a cooling water passage for discharging from the discharge port 6 is formed. Specifically, the introduction passage 10, the cooling passage 20, and the discharge passage 30 are formed. The passages 10, 20, and 30 of the cooling water formed in the internal space of the cooler 3 will be described later with reference to FIG.

  The heat sink 2 has a function of transmitting the heat of the heating element 100 provided so as to be in contact with the surface thereof to the cooling water flowing in the internal space on the back side of the heat sink. A plurality of cooling fins 7 are provided on the back surface of the heat sink 2 in order to efficiently transfer the heat of the heating element 100 to the cooling water. The type of the heating element 100 is not particularly limited as long as it generates heat. Examples of the heating element 100 include electronic parts such as a semiconductor module and a rotating machine such as a motor.

  As shown in FIG. 3, the convex portion 4 inside the housing is provided at a position generally facing the cooling fin 7 of the heat sink 2. By providing such a convex portion 4 and narrowing the internal space of the portion (cooling passage 20) facing the heat sink 2, heat exchange is reliably performed between the heating element 100 and the cooling water via the heat sink 2. It is supposed to be.

  The cooler 3 is formed as described above, and cools the heating element 100 by transferring the heat of the heating element 100 to the cooling water via the heat sink 2.

  FIG. 4 is a top view of the housing 1, each passage 10, 20, 30 formed in the internal space of the cooler 3, and the flow direction of the cooling water flowing through each passage 10, 20, 30, FIG.

  The introduction passage 10 is a passage through which cooling water is introduced from the outside of the cooler 3 through the introduction port 5. As shown in FIGS. 2 and 4, the introduction passage 10 is partitioned by the side walls 1 a to 1 c and the bottom wall 1 e of the housing 1, the first side surface 41 of the convex portion 4, and the back surface of the heat sink 2. . In the present embodiment, the introduction passage 10 is formed such that the cooling water flowing through the introduction passage 10 flows in parallel with the introduction direction of the cooling water introduced from the introduction port 5.

  As shown in FIG. 4, the introduction passage 10 is further downstream than the upstream side (the introduction port 5 side) of the introduction passage 10 by inclining the first side surface 41 of the convex portion 4 with respect to the introduction direction of the cooling water. It is formed so that the space on the side (side wall 1c side) is narrow, that is, the passage sectional area on the downstream side is smaller than the upstream side of the introduction passage 10.

  The cooling passage 20 is a passage formed on the back side of the heat sink 2. As shown in FIGS. 2 and 4, the cooling passage 20 is partitioned by the upper surface 42 of the convex portion 4 and the back surface of the heat sink 2. The cooling passage 20 communicates with the introduction passage 10, and the cooling water introduced into the introduction passage 10 flows into the cooling passage 20 with the flow direction changed by 90 degrees as shown in FIG. In the cooling passage 20, heat exchange is performed between the heating element 100 and the cooling water via the heat sink 2.

  As shown in FIGS. 2 and 4, the discharge passage 30 is partitioned by the side walls 1 a, 1 c, 1 d and the bottom wall 1 e of the housing 1, the second side surface 43 of the convex portion 4, and the back surface of the heat sink 2. It is a passage. The discharge passage 30 communicates with the cooling passage 20, and the cooling water flowing through the cooling passage 20 is discharged from the discharge port 6 to the outside of the cooler 3 through the discharge passage 30.

  As described above, in the cooler 3 according to the present embodiment, the introduction direction of the cooling water introduced from the introduction port 5, that is, the introduction passage 10 flows with respect to the flow direction of the cooling water flowing through the cooling passage 20 on the back side of the heat sink. The flow direction of the cooling water is perpendicular. Therefore, for example, if the passage cross-sectional area of the introduction passage 10 is the same from the upstream side to the downstream side, the cooling water introduced into the introduction passage 10 from the introduction port 5 is more than the upstream side of the introduction passage 10 due to the inertia of the cooling water. A large amount flows downstream, and then the flow direction is changed by 90 degrees to flow through the cooling passage 20 on the back side of the heat sink 2.

  Then, the flow rate of the cooling water that flows into the cooling passage 20 from the upstream side of the introduction passage 10 becomes slower than the flow rate of the cooling water that flows into the cooling passage 20 from the downstream side of the introduction passage 10. As a result, the flow velocity distribution of the cooling water flowing through the cooling passage 20 becomes biased, and the heat generated between the heating element 100 and the cooling water in the cooling passage 20 near the cooling water flowing from the upstream side of the introduction passage 10 flows. There is a risk that sufficient replacement will not be possible. As a result, the desired cooling performance may not be obtained.

  As described above, when the flow direction of the cooling water changes when the cooling water introduced into the internal space flows into the back side of the heat sink 2, the flow direction of the cooling water must be considered without considering the shape of the passage formed in the internal space. Accordingly, the flow velocity distribution of the cooling water flowing on the back side of the heat sink 2 is inevitably determined according to the change in the temperature. As a result, for example, as described above, the flow velocity distribution of the cooling water flowing through the cooling passage 20 becomes non-uniform, and the desired cooling performance cannot be obtained.

  Therefore, in the present embodiment, by providing a portion where the cross-sectional area of the passage changes in the passage formed in the internal space, the flow velocity distribution is a desired flow velocity distribution, for example, the flow velocity distribution of the cooling water flowing through the cooling passage 20 is made uniform. It was decided to adjust so that.

  Specifically, the introduction passage 10 is formed so that the passage cross-sectional area on the downstream side of the introduction passage 10 is smaller than that on the upstream side. As shown in FIG. 4, in this embodiment, the passage cross-sectional area is continuously changed so that the passage cross-sectional area gradually decreases from the upstream side to the downstream side of the introduction passage 10. As shown in FIG. 5, as a modification of the present embodiment, the passage cross-sectional area may be reduced stepwise by forming the first side surface 41 of the convex portion 4 in a step shape.

  By reducing the passage cross-sectional area on the downstream side of the upstream side of the introduction passage 10, the water flow resistance on the downstream side becomes higher than that on the upstream side of the introduction passage 10, and the cooling water hardly flows downstream of the introduction passage 10. Become. Thereby, the flow rate of the cooling water flowing through the introduction passage 10 can be made uniform from the upstream side to the downstream side. Therefore, since the flow rate of the cooling water flowing into the cooling passage 20 is also adjusted to be uniform, the flow velocity distribution of the cooling water flowing through the cooling passage 20 can be made uniform.

  In the present embodiment, the desired flow velocity distribution is a uniform flow velocity distribution. However, for example, when the central portion of the heating element 100 is particularly cooled, the desired flow velocity distribution has the highest flow velocity at the central portion of the cooling passage 20. Flow velocity distribution. In this case, the introduction passage 10 may be formed so that the passage cross-sectional area of the midstream portion of the introduction passage 10 is the largest. In this way, the flow rate of the cooling water can be freely adjusted in the introduction passage by changing the cross-sectional area of the introduction passage 10 along the flow direction of the cooling water flowing through the introduction passage 10. The flow velocity distribution of the cooling water flowing through the passage 20 can be freely adjusted.

  The cooler 3 according to the present embodiment described above is a cooler 3 in which a passage for flowing cooling water (refrigerant) is formed in an internal space defined by the casing 1 and the heat sink (heat radiator) 2. The passage is formed so that the flow direction of the cooling water changes when the cooling water introduced into the internal space flows into the back side of the heat sink 2 and adjusts the flow velocity distribution of the cooling water flowing through the back side of the heat sink 2. Therefore, the introduction passage 10 is provided as a portion where the passage sectional area changes.

  Thus, by changing the passage cross-sectional area of the introduction passage 10, the flow resistance of the cooling water flowing through the introduction passage 10 is adjusted, and the flow rate of the cooling water flowing through the portion where the passage cross-sectional area is changed in the introduction passage 10. Can be adjusted. As a result, when the flow direction is changed from the introduction passage 10 to the cooling passage 20 on the back side of the heat sink, the flow rate of the cooling water flowing into the cooling passage 20 is also adjusted. The distribution can be a desired flow rate distribution.

  Further, the cooler 3 according to the present embodiment is formed in the introduction passage 10 through which the cooling water is introduced from the outside of the cooler 3 and the back side of the heat sink 2 as a passage for flowing the cooling water. And a cooling passage 20 into which the introduced cooling water flows and changes the flow direction. The passage cross-sectional area of the introduction passage 10 is changed along the flow direction of the cooling water flowing through the introduction passage 10.

  Thereby, since the flow volume of the cooling water can be freely adjusted in the introduction passage 10, the flow velocity distribution of the cooling water flowing through the cooling passage 20 can be freely adjusted, and a desired flow velocity distribution can be realized. .

  In particular, if the passage cross-sectional area of the introduction passage 10 is decreased continuously or stepwise along the flow direction of the cooling water flowing through the introduction passage 10, the flow velocity distribution of the cooling passage 20 can be made uniform.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. In the following embodiments, the same reference numerals are used for portions that perform the same functions as those of the first embodiment described above, and repeated descriptions are omitted as appropriate.

  FIG. 6 is a top view of the housing 1 of the cooler 3 according to the second embodiment of the present invention. FIG. 7 is a cross-sectional view of the cooler 3 taken along line VII-VII in FIG.

  As shown in FIG. 6, the housing 1 of the cooler 3 according to the present embodiment is provided with an introduction port 5 in the central portion of one opposing side wall 1 b and a discharge port 6 in the central portion of the other side wall 1 d. The cooling water introduction direction and the flow direction of the cooling water flowing through the cooling passage 20 are formed so as to be parallel to each other.

  When the casing 1 has such a shape, the cooling water introduced into the central portion of the introduction passage 10 from the introduction port 5 hits the first side surface 41 of the convex portion 4 and diffuses left and right, and then the introduction passage 10. Flows from the bottom wall 1e side of the housing 1 (the lower side in the figure in FIG. 7) toward the back side of the heat sink 2 (the upper side in the figure in FIG. 7). Thereafter, the flow direction is changed by 90 degrees to flow into the cooling passage 20.

  Although the cooling water introduced from the introduction port 5 into the central portion of the introduction passage 10 collides with the first side surface 41 of the convex portion 4 and diffuses left and right, the flow rate of the cooling water flowing through the central portion of the introduction passage 10 and the introduction When the flow rate of the cooling water flowing near the both ends of the passage 10 (upper and lower sides in FIG. 6) is compared, the flow rate of the cooling water flowing through the central portion of the introduction passage 10 tends to increase. If it does so, the flow-velocity distribution of the cooling water which flows through the cooling channel | path 20 becomes non-uniform | heterogenous, and there exists a possibility that desired cooling performance may not be acquired.

  Therefore, in this embodiment as well, as in the first embodiment, by providing a portion where the passage cross-sectional area changes in the passage formed in the internal space of the cooler 3, for example, the flow velocity distribution of the cooling water flowing through the cooling passage 20 can be obtained. It was decided to adjust the flow velocity distribution to be a desired flow velocity distribution, for example, by equalizing.

  Specifically, the introduction passage 10 is formed so that the passage sectional area on the downstream side (the heat sink 2 side) is smaller than the upstream side (the bottom wall 1e side) of the introduction passage 10. That is, as shown in FIGS. 6 and 7, a protruding portion 44 that protrudes from the first side surface 41 of the convex portion 4 toward the introduction passage 10 is formed on the downstream side of the introduction passage 10, and the amount of protrusion is determined by the housing. When 1 was seen from the upper surface, it became so large that it went to the center part from the both ends of the introduction channel | path 10. FIG.

  Thereby, since the water flow resistance in the central portion of the introduction passage 10 can be increased, the flow rate of the cooling water flowing through the central portion of the introduction passage 10 and the flow rate of the cooling water flowing in the vicinity of both ends of the introduction passage 10 are It can be made uniform.

  Thus, even when the cooling water is introduced from the outside of the cooler 3 in parallel with the flow direction of the cooling water flowing through the cooling passage 20, the passage formed in the internal space of the cooler 3 By providing a portion where the cross-sectional area of the passage changes, the same effect as in the first embodiment can be obtained.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS.

  FIG. 8 is a top view of the housing 1 of the cooler 3 according to the third embodiment of the present invention. FIG. 9 is a cross-sectional view of the cooler 3 taken along the line IX-IX in FIG.

  As shown in FIG. 8, the housing 1 of the cooler 3 according to the present embodiment is formed so that the first side surface 41 of the convex portion 4 is parallel to the cooling water introduction direction. On the other hand, the housing 1 of the cooler 3 according to the present embodiment has one or more (three in this embodiment) connected to the first side surface 41 of the convex portion 4 and the side wall 1b of the housing 1. A wall 45 is provided.

  As shown in FIG. 9, the walls 45 are formed at predetermined intervals along the flow direction of the cooling water flowing through the introduction passage 10. Further, the wall 45 has a length of the wall 45 formed on the downstream side (left side in FIG. 9) of the introduction passage 10 rather than the length of the wall 45 formed on the upstream side (right side in FIG. 9) of the introduction passage 10. It is formed to be longer. The lengths of the walls 45 may all be the same.

  Thus, in this embodiment, by providing the wall 45 in the introduction passage along the flow direction of the cooling water flowing through the introduction passage 10, the water flow resistance on the downstream side is higher than the upstream side of the introduction passage 10. did. Therefore, similarly to the first embodiment, the flow rate of the cooling water flowing through the upstream side and the downstream side of the introduction passage 10 is adjusted, and the flow rate of the cooling water flowing through the introduction passage 10 is made uniform from the upstream side to the downstream side. it can. Therefore, the flow rate of the cooling water flowing into the cooling passage 20 is also adjusted, and the flow velocity distribution of the cooling water flowing through the cooling passage 20 can be made uniform.

  Further, the flow direction of the cooling water flowing from the introduction passage 10 into the cooling passage 20 can be adjusted by the wall 45.

  As described above, the cooler 3 according to the present embodiment has the passage cross-sectional area in the introduction passage by providing one or more walls 45 in the introduction passage along the flow direction of the cooling water flowing through the introduction passage 10. Is provided so as to change the passage cross-sectional area of the introduction passage 10.

  Therefore, the flow resistance of the cooling water flowing through the introduction passage 10 is adjusted by the wall 45 in the introduction passage, and the flow rate of the cooling water flowing through the introduction passage 10 can be adjusted. As a result, when the flow direction is changed from the introduction passage 10 to the cooling passage 20 on the back side of the heat sink, the flow rate of the cooling water flowing into the cooling passage 20 is also adjusted. The distribution can be a desired flow rate distribution. Further, the flow direction of the cooling water flowing into the cooling passage 20 can be adjusted by the wall 45 in the introduction passage.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIGS.

  FIG. 10 is a top view of the housing 1 of the cooler 3 according to the fourth embodiment of the present invention. FIG. 11 is a cross-sectional view of the cooler 3 taken along line XI-XI in FIG.

  As shown in FIG. 10, in this embodiment, the thickness of each wall 45 when the housing 1 is viewed from the top surface is gradually reduced from the first side surface 41 of the convex portion 4 toward the side wall 1 b. .

  As shown in FIG. 11, in the cooling passage 20, the flow of cooling water flowing in the vicinity of the upper surface 42 of the convex portion 4 (flow of cooling water flowing in the cooling water path 21) and the cooling water flowing in the vicinity of the back surface of the heat sink 2. (A flow of cooling water flowing through the cooling water path 22). The cooling water flowing through the cooling water passage 21 is cooling water flowing from the inside of the introduction passage 10 (the convex portion 4 side), and the cooling water flowing through the cooling water passage 22 is outside the introduction passage 10 (side wall 1b side). It is the cooling water that flows in from.

  Comparing the path lengths of the two cooling water paths 21 and 22, the path length of the cooling water path 22 near the back surface of the heat sink 2 is larger than the path length of the cooling water path 21 near the upper surface 42 of the protrusion 4. become longer. Therefore, the flow rate of the cooling water flowing through the cooling water path 22 near the back surface of the heat sink 2 is smaller than the flow rate of the cooling water flowing through the cooling water path 21 near the upper surface 42 of the convex portion 4.

  Since the heat of the heating element 100 is transmitted to the cooling water via the heat sink 2, in order to improve the cooling performance of the cooler 3, the flow rate of the cooling water flowing through the cooling water path 22 near the back surface of the heat sink 2 is set as much as possible. More is desirable.

  Therefore, in this embodiment, in order to increase the flow rate of the cooling water flowing through the cooling water path 22 in the vicinity of the back surface of the heat sink 2, the thickness of each wall 45 is changed from the first side surface 41 of the convex portion 4 to the side wall 1b of the housing 1. It was made to become thinner gradually toward the. Thereby, since the space | interval of each wall 45 of the outer side (side wall 1b side) of the introduction channel | path 10 becomes wider than the space | interval of each wall 45 of the inner side (convex part 4 side) of the introduction channel | path 10, the outer side ( The flow rate of the cooling water flowing through the cooling water path 22 near the back surface of the heat sink 2 can be increased by reducing the flow resistance of the cooling water flowing into the vicinity of the back surface of the heat sink 2 from the side wall 1b side. As a result, the cooling performance of the cooler 3 can be improved.

  In the cooler 3 according to the present embodiment described above, the introduction passage 10 is formed between the side wall 1b of the housing 1 and the convex portion 4 protruding from the bottom wall 1e of the housing 1 toward the heat sink 2. ing. Further, the wall 45 in the introduction passage 10 is formed so as to connect the side wall 1b and the first side surface 41 of the convex portion 4 facing the side wall 1b. And the thickness of the wall 45 along the flow direction of the cooling water flowing through the introduction passage 10 is thinner on the side wall 1b side than on the convex portion 4 side.

  Therefore, the interval between the walls 45 on the outside (side wall 1b side) of the introduction passage 10 is wider than the interval between the walls 45 on the inside (convex portion 4 side) of the introduction passage 10, and therefore the outside (side wall) of the introduction passage 10 1b), the flow resistance of the cooling water flowing into the vicinity of the back surface of the heat sink 2 can be reduced, and the flow rate of the cooling water flowing through the cooling water path 22 near the back surface of the heat sink 2 can be increased. As a result, the cooling performance of the cooler 3 can be improved.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  For example, the cooler 3 according to the first embodiment may be changed to the shape shown in FIGS.

  FIGS. 12A to 14A are respectively top views of the casing 1 of the cooler 3 according to the modification of the first embodiment, and FIGS. 12 to 14B are respectively FIGS. FIG. 15 is a cross-sectional view of the housing 1 taken along the line BB in FIG.

  In the first embodiment, the passage cross-sectional area of the introduction passage 10 is changed by inclining the first side face 41 of the convex portion 4, but the thickness of the bottom wall 1e is changed as shown in FIG. The passage cross-sectional area of the introduction passage 10 may be changed by gradually increasing the thickness along the flow direction of the cooling water flowing through the introduction passage 10.

  Further, as shown in FIG. 13B, the passage cross-sectional area of the introduction passage 10 is changed by increasing the thickness of the bottom wall 1e stepwise along the flow direction of the cooling water flowing through the introduction passage 10. May be.

  Furthermore, as shown in FIG. 14B, the thickness of the central portion of the bottom wall 1e forming a part of the introduction passage 10 may be the thinnest.

  In the cooler 3 according to the third and fourth embodiments, the inlet 5 and the outlet 6 are provided in the side wall 1a. However, as in the second embodiment, the cooler 3 is introduced into the central portion of the opposite side wall 1b. The outlet 5 may be provided, and the outlet 6 may be provided at the center of the other side wall 1d.

DESCRIPTION OF SYMBOLS 1 Case 1a-1d Side wall 1e Bottom wall 2 Heat sink (heat radiator)
3 cooler 4 convex part 41 1st side surface (side surface of convex part)
10 Introduction passage 20 Cooling passage 45 Wall

Claims (8)

A cooler in which a passage for flowing a refrigerant in an internal space partitioned by a housing and a radiator is formed;
The passage is formed such that the flow direction of the refrigerant changes when the refrigerant introduced into the internal space flows into the back side of the radiator.
In order to adjust the flow velocity distribution of the refrigerant flowing on the back side of the radiator, the passage cross-sectional area has a portion that changes,
A cooler characterized by that. The cooler according to claim 1, wherein
The passage includes an introduction passage through which the refrigerant is introduced from the outside of the cooler, a cooling passage that is formed on the back side of the heat radiator and the refrigerant introduced into the introduction passage changes in a flow direction, and Including
The passage cross-sectional area of the introduction passage was changed along the flow direction of the refrigerant flowing through the introduction passage.
A cooler characterized by that. The cooler according to claim 2, wherein
The passage cross-sectional area of the introduction passage is continuously or stepwise reduced along the flow direction of the refrigerant flowing through the introduction passage;
A cooler characterized by that. The cooler according to claim 3, wherein
The introduction passage is a passage formed between a side wall of the housing and a convex portion that protrudes from the bottom wall of the housing toward the radiator,
By forming the side surface of the convex portion stepwise, the passage cross-sectional area of the introduction passage is reduced stepwise along the flow direction of the refrigerant.
A cooler characterized by that. The cooler according to claim 2, wherein
The cross-sectional area of the introduction passage was changed by providing one or more walls in the introduction passage along the flow direction of the refrigerant flowing through the introduction passage.
A cooler characterized by that. The cooler according to claim 5, wherein
The introduction passage is a passage formed between a side wall of the housing and a convex portion that protrudes from the bottom wall of the housing toward the radiator,
The wall is formed by connecting a side surface of the convex portion and an inner surface of the side wall facing the side surface of the convex portion,
The thickness of the wall along the flow direction of the refrigerant flowing through the introduction passage is thinner on the side wall side than on the convex side,
A cooler characterized by that. A cooler according to any one of claims 2 to 6, comprising:
The refrigerant is introduced into the introduction passage from the outside of the cooler at a right angle to the flow direction of the refrigerant flowing through the cooling passage.
A cooler characterized by that. A cooler according to any one of claims 2 to 6, comprising:
The refrigerant is introduced into the introduction passage from the outside of the cooler in parallel with the flow direction of the refrigerant flowing through the cooling passage.
A cooler characterized by that.

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