JP5814163B2 - Cooler - Google Patents

Description

  In this specification, the cooler which cools a heat generating body is disclosed by arrange | positioning in the position which touches a heat generating body, and flowing a cooling fluid.

  Patent Documents 1 and 2 disclose a cooler that is arranged and used at a position in contact with a heating element. A conventional cooler 4 will be described with reference to FIGS. 8 and 9 schematically showing the cooler. Reference numeral 16 is an outer wall of the cooler 4 and defines a flow path through which the coolant passes. Reference numeral 8 is a cooling liquid inflow pipe, and reference numeral 10 is a cooling liquid outflow pipe. The coolant flowing into the cooler 4 from the inflow pipe 8 passes through the inside of the cooler 4 in the x direction in the figure and flows out from the outflow pipe 10. The outer wall 16 is formed with a first surface 16a in contact with the first heating element 6a and a second surface 16b in contact with the second heating element 6b. The first heating element 6a is in close contact with the first surface 16a, and the second heating element 6b is in close contact with the second surface 16b. The cooler 4 is sandwiched between the first heating element 6a and the second heating element 6b and cools the first heating element 6a and the second heating element 6b located on both sides.

  In order to improve the cooling efficiency, an inner wall 18 is formed in the space surrounded by the outer wall 16, and the passage for cooling liquid is branched into a plurality of fine channels. As shown in FIG. 9, by laminating three plate-like members 18a, 18b, 18c, an inner wall 18 that branches into a plurality of fine channels is formed. The first plate member 18a is in contact with the inner surface of the first surface 16a. The second plate member 18c is in contact with the inner surface of the second surface 16b. The intermediate plate member 18b is inserted between the first plate member 18a and the second plate member 18c.

  Each of the plate-like members 18a, 18b, and 18c has a mountain line 30 that bulges toward the first surface 16a and a valley line 32 that bulges toward the second surface 16b along the y direction shown in the figure. Repeated shapes that appear alternately when observed are formed. Each mountain line 30 and each valley line 32 extend in the illustrated x direction. However, it does not extend straight along the x axis, but extends while being displaced in the + y direction and the −y direction at a predetermined wavelength L. That is, each mountain line 30 and each valley line 32 extends in the x direction while being bent in the ± y direction at a predetermined wavelength L. In FIG. 9, only the bent shape of one valley streak 32 is shown for clarity of illustration. Similarly, other valley lines and mountain lines extend in the x direction while bending in the ± y direction at a predetermined wavelength L.

  In this specification, the illustrated x direction connecting the inflow pipe 8 and the outflow pipe 10 is referred to as a passing direction. The z direction in which the cooler 4 and the heating element 6 are stacked is referred to as a stacking direction. The y direction shown in the figure where the mountain line 30 and the valley line 32 are displaced at a predetermined wavelength is referred to as a bending direction. The x direction, the y direction, and the z direction are orthogonal to each other. The first surface 16a and the second surface 16b extend along a surface including a passing direction and a bending direction. Each of the plate-like members 18a, 18b, and 18c also extends along a plane including the passing direction and the bending direction, and is stacked in the stacking direction.

  When a cooler used between two heating elements is used, it can be stacked in multiple stages in the z direction. In the example of Patent Document 1, the first cooler, the first heating element, the second cooler, the second heating element, the third cooler, the third heating element,. An improved structure is disclosed. The second cooler is sandwiched between the first heating element and the second heating element, and cools the first heating element and the second heating element. The third cooler is sandwiched between the second heating element and the third heating element, and cools the second heating element and the third heating element. There is no particular limitation on the number of stacked layers, and the number of stacked layers can be used in the minimum unit in which one cooler is sandwiched between two heating elements. Alternatively, for example, as in the first cooler, the heating element may be disposed only on one side of the cooler.

JP 2011-228580 A JP 2010-10418 A

The coolers 4 of Patent Documents 1 and 2 have extremely high performance and high cooling efficiency. For example, the laminated plate-like members 18a, 18b, and 18c are branched into fine flow paths, and the contact area between the wall of the cooler 4 and the cooling liquid through which the heat of the heating elements 6a and 6b is transferred is ensured. The heat exchange rate is high. The fine flow path is adjusted to have a cross-sectional size in which the flow resistance increases rapidly when it becomes narrower than that, and the flow resistance of the coolant is not high. In addition, since the microchannel does not extend straight and is bent in the ± y direction, turbulent flow occurs in the flow of the coolant in the microchannel, and the heat exchange rate between the coolant and the wall Will improve.
In the present specification, a technique for further improving the cooling efficiency of a cooler having already high cooling efficiency is disclosed.

The cooler disclosed in the present specification is used by allowing a coolant to pass through in a state where the cooler is in contact with at least one heating element. The cooler includes an outer wall that defines a flow path through which the coolant passes, and an inner wall that is accommodated in the flow path. In this specification, the direction in which the coolant passes is the passing direction, the direction orthogonal to the passing direction is the stacking direction, and the direction orthogonal to the passing direction and the stacking direction is the bending direction.
The outer wall includes a first surface that extends along a plane including a passing direction and a bending direction and that contacts the heating element, and a second surface that extends from the first surface at a distance in the stacking direction. The inner wall is accommodated in the flow path in a state where a plurality of plate-like members parallel to the first surface are stacked in the stacking direction. Each plate-like member has a shape in which a mountain line that bulges on the first surface side and a valley line that bulges on the second surface side are alternately repeated in the bending direction. Each mountain line and each valley line extends in the passing direction. However, it does not extend straight, but is displaced in the bending direction while reversing the displacement direction at a predetermined wavelength. The phase of the mountain line formed in one plate-like member adjacent in the stacking direction and the valley line formed in the other plate-like member are out of phase, and the mountain surface and the valley line intersect with each other. The 1st protrusion part which protrudes toward the 2nd surface is formed in the plate-shaped member in the range which touches.

  The mountain line of the first plate-like member and the plate-like member adjacent to it (when two plate-like members are laminated, it is the second plate-like member, and three plate-like members are laminated) In some cases, it is an intermediate plate-like member. 4 or more plate-like members may be stacked. A range where the lines face each other is formed. The ridges of the first plate member are in contact with the first surface (more precisely, the inner surface of the first surface). In the cooler disclosed in the present specification, the first plate-shaped member within the range where the mountain and valley lines face each other is formed with a protruding portion that protrudes toward the second surface. Therefore, the flow of the coolant that passes through the ridges of the first plate member is disturbed by the protrusions. If there is no protrusion, the coolant flowing in a laminar flow along the mountain line is disturbed by the protrusion and becomes a turbulent flow. Heat exchange between the coolant and the wall when the coolant flows in a turbulent flow compared to the heat exchange rate between the coolant and the wall when the coolant flows as a laminar flow along the wall The rate is higher. If the first surface is brought into close contact with the heating element, the heating element is efficiently cooled.

When this cooler is used by sandwiching it between a plurality of heating elements, the first surface is brought into close contact with the first heating element, and the second surface is brought into close contact with the second heating element. In this case, the first surface and the second surface are parallel, and the second projecting portion that projects toward the first surface is formed on the plate-like member within the range where the mountain and valley lines intersect and contact the second surface. To do.
Moreover, it is preferable to laminate | stack in order the 1st plate-shaped member which contact | connects a 1st surface, an intermediate | middle plate-shaped member, and the 2nd plate-shaped member which contacts a 2nd surface, and comprises an inner wall. In this case, the first projecting portion projecting toward the second surface is formed on the first plate member within the range where the mountain line of the first plate member intersects the valley of the intermediate plate member and is in contact with the first surface. And forming a second projecting portion projecting toward the first surface on the second plate-shaped member within a range where the valley of the second plate-shaped member and the mountain streak of the intermediate plate-shaped member intersect with each other. Form.

  According to the above, the coolant that cools the first heating element becomes turbulent by the first protrusion, and the coolant that cools the second heating element becomes turbulent by the second protrusion. Both the first heating element and the second heating element are efficiently cooled.

  According to the cooler disclosed in the present specification, the cooling efficiency of the coolers of Patent Documents 1 and 2 having already high cooling efficiency is further improved.

FIG. 3 is a plan view of a structure in which a plurality of coolers and a plurality of heating elements are alternately stacked in multiple stages. II-II sectional drawing of FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1 and shows a state in which a cooler is sandwiched between two heating elements. The top view of the raw material for forming the inner wall on which three plate-shaped members are laminated | stacked. The enlarged view of the V section of FIG. VI-VI sectional drawing of FIG. The figure which illustrates the relationship between the mountain line and valley line from which a phase differs. The figure which shows the external shape of the conventional cooler typically. The figure which shows typically a part of internal structure of the conventional cooler.

The main features of the embodiments shown below are listed.
(Characteristic 1) The height of the mountain line formed in each plate-like member (the height of the mountain line is equal to the depth of the valley line) is equal. Each protrusion length of the first protrusion and the second protrusion is shorter than the height of the mountain line. The first protrusion and the second protrusion are formed at a portion where the height of the fine channel is twice the height of the mountain line because the mountain line and the valley line face each other. Here, since the first protrusion or the second protrusion having a protrusion length shorter than the height of the mountain line is formed, the flow path height that is not interrupted by the protrusion part is equal to or higher than the height of the mountain line. . Even if the protrusion is formed, the height of the remaining flow path is maintained. By providing the protrusion, the flow resistance is not significantly increased.
(Characteristic 2) The 1st plate-shaped member which contact | connects a 1st surface, the intermediate | middle plate-shaped member, and the 2nd plate-shaped member which contact | connects a 2nd surface are laminated | stacked in order. A first protrusion is formed on the first plate member, a second protrusion is formed on the second plate member, and no protrusion is formed on the intermediate plate member.
(Characteristic 3) A protruding portion is formed by making a U-shaped cut in a plate-like member and bending it.
(Characteristic 4) The protrusions are formed in all ranges where the mountain and valley lines face each other and the height of the fine channel is twice the height of the mountain lines.
(Characteristic 5) The protrusion is formed in a part of the range in which the mountain and valley lines face each other and the height of the fine channel is twice the height of the mountain line.
(Characteristic 6) An inner wall in which a plurality of plate-like members are stacked is formed by bending a single metal sheet.
(Feature 7) The mountain and valley lines formed on the inner wall extend in the passing direction and are displaced in the bending direction while inverting the displacement direction at a predetermined wavelength. The passage path of the coolant is a so-called wave shape. The inner wall functions as a fin that increases the contact area with the coolant. The cooler according to the embodiment is a cooler incorporating a wave fin.
(Characteristic 8) The cooler according to the embodiment cools the heating elements on both sides by being sandwiched between two heating elements. However, it is also possible to use only one heating element, such as the coolers 4a and 4l illustrated in FIG. In this case, it is only necessary to provide the protrusion only on the surface in contact with the heating element. In the case of a cooler that cools only one heating element, when the surface on the side in contact with the heating element is the first surface, the protrusion only needs to be provided on the first surface side.

  FIG. 1 is a plan view of a structure 2 in which a plurality of coolers 4 and a plurality of heating elements 6 are stacked in multiple layers in the stacking direction (z direction) as viewed from the bending direction (y direction). 8 in the figure is an inflow pipe for the coolant, and 10 in the figure is an outflow pipe for the coolant. The first cooler 4a, the first heating element 6a, the second cooler 4b, the second heating element 6b, and the third cooler 4c are stacked in this order from the opposite side of the inflow pipe 8 and the outflow pipe 10. Yes. The heating elements 6a, 6b, 6c,... Are divided into left and right, and are distinguished by suffixes A and B. The phenomenon common to the left and right heating elements will be described with the subscripts A and B omitted. Also, the events common to the first heating element 6a to the eleventh heating element 6k will be described with the suffixes a and b omitted. Further, the events common to the first cooler 4a to the twelfth cooler 4l will be described with the subscripts a and b omitted.

The coolers adjacent in the stacking direction behind the coolant inflow pipe 8 are connected by communication pipes 8a, 8b,. Similarly, the coolers adjacent in the stacking direction behind the cooling liquid outflow pipe 10 are connected by communication pipes 10a, 10b,.
A part of the coolant that has flowed in from the inflow pipe 8 is divided into the twelfth cooler 4l and to the communication pipe 8k. A part of the coolant that has been divided into the communication pipe 8k is divided into the eleventh cooler 4k and also into the communication pipe 8j. The same applies to the following. The coolant that has passed through the first cooler 4a to the twelfth cooler 4l joins and flows out from the outflow pipe 10. An arrow 12 indicates the inflowing coolant, and an arrow 14 indicates the outflowing coolant, indicating the circulation of the coolant.

  For example, the second cooler 4b is sandwiched between first heating elements 6aA and 6aB (collectively referred to as 6a) and second heating elements 6bA and 6bB (collectively referred to as 6b). As the coolant passes through the second cooler 4b, the first heating element 6a and the second heating element 6b are cooled. The third cooler 4c to the eleventh cooler 4k are also sandwiched between the heating elements 6 on both sides, and cool the heating elements 6 on both sides. However, the 1st cooler 4a cools the 1st heat generating body 6a which exists in one side, and the 12th cooler 4l cools the 11th heat generating body 6k which exists in one side.

  FIG. 2 shows a II-II cross section of FIG. FIG. 3 shows a III-III cross section of FIG. FIG. 3 shows a cross section of the right first heating element 6aB, the second cooler 4b, and the right second heating element 6bB. The sectional views of the first cooler 4a to the twelfth cooler 4l are the same, and will be described below in common.

  The cooler 4 includes outer walls 16 c and 16 d and defines an outer contour of the coolant flow path 17. As shown in FIG. 2, the coolant flow path 17 extends in the x direction. As shown in FIG. 3, the heating element 6a is in contact with the outer surface of the outer wall 16c. The range of the outer surface of the outer wall 16c that is in contact with the heating element 6a corresponds to the first surface in the claims. The heating element 6b is in contact with the outer surface of the outer wall 16d. The range of the outer surface of the outer wall 16d that is in contact with the heating element 6b corresponds to the second surface in the claims. With respect to all of the second cooler 4b to the eleventh cooler 4k, the surface in contact with the heating element with the smaller number is referred to as the first surface 16a, and the surface in contact with the heating element with the larger number is referred to as the second surface 16b. A heating element with a young number is called a first heating element, and a heating element with a large number is called a second heating element.

  The inner wall 18 is accommodated in a space (coolant flow path 17) whose outline is defined by the outer walls 16c and 16d. As shown in FIG. 2, the inner wall 18 is also divided into a left inner wall 18 </ b> A and a right inner wall 18 </ b> B corresponding to the heating element 6 being divided into left and right. The left and right inner walls 18A and 18B have the same structure, and common events will be described with the subscripts A and B omitted.

As shown in FIG. 3, the inner wall 18 is configured by laminating a first plate member 18a, an intermediate plate member 18b, and a second plate member 18c in the lamination direction (z direction). Since FIG. 3 shows a cross section of the right inner wall, a subscript B is added. The same applies to the left inner wall 18A. Each of the plate-like members 18a, 18b, and 18c has a mountain line 30 that bulges toward the first surface 16a and a valley line 32 that bulges toward the second surface 16b along the y direction shown in the figure. Repeated shapes that appear alternately when observed are formed. Each mountain line 30 and each valley line 32 extend in the illustrated x direction. However, it does not extend straight along the x axis, but extends while being displaced alternately at a predetermined wavelength L in the + y direction and the −y direction as shown in FIG. That is, each mountain line 30 and each valley line 32 extends in the x direction while being bent in the ± y direction at a predetermined wavelength L. A wave-shaped fine channel is provided.
By laminating the first plate-like member 18a, the intermediate plate-like member 18b, and the second plate-like member 18c, in which the mountain line 30 and the valley line 32 are formed, in the laminating direction (z direction), the coolant flow path 17 is , And divided into a plurality of fine channels 20. The contact area between the coolant and the walls constituting the cooler 4 increases. The inner wall 18 is a fin that increases the contact area with the coolant, and provides a wave fin that is divided into fine wave-shaped channels.

In a pair of plate-like members adjacent to each other in the stacking direction, the phases of the mountain stripes formed on one plate-like member and the valley stripes formed on the other plate-like member are shifted. (2) of FIG. 7 shows a yz cross section of the mountain line 30 and the valley line 32 formed in the second plate-like member 18c in contact with the second surface 16b. (1) of FIG. 7 shows a view in which the intermediate plate member 18b is removed and the second plate member 18c is viewed from the first surface 16a side. The range that extends upward (the range indicated by the broken line in (2)) is shown. The valley line 32 extends in the x direction at a predetermined wavelength L while being displaced in the ± y direction. The same applies to the mountain line 30.
(4) of FIG. 7 shows a yz cross section of the mountain line 30 and the valley line 32 formed in the intermediate plate member 18b located above the second plate member 18c. The area to which the dots in (3) in FIG. 7 are attached indicates the area in which the range in which the mountain line 30 opens downward (the area indicated by the broken line in (4)) is extended. The mountain line 30 extends in the x direction at a predetermined wavelength L while being displaced in the ± y direction. The same applies to the valley line 32.
Although not shown in FIG. 7, the same applies to the mountain streak 30 and the valley streak 32 formed in the first plate-like member 18a.

  The crests 30 and the troughs 32 formed in the first plate member 18a, the intermediate plate member 18b, and the second plate member 18c extend in the x direction while being displaced in the ± y direction. Wavelength and amplitude are equal. Only the phase is different.

In a pair of plate-like members adjacent to each other in the stacking direction, the phases of the mountain stripes formed on one plate-like member and the valley stripes formed on the other plate-like member are shifted. (6) of FIG. 7 is a diagram in which the upper opening range of the valley line 32 of the second plate-shaped member 18c and the lower opening range of the mountain line 30 of the intermediate plate-shaped member 18b are displayed in an overlapping manner. The hatched range indicates a range where the valley line 32 of the second plate member 18c and the mountain line 30 of the intermediate plate member 18b face each other. In this range, as shown in (5) of FIG. In addition, the fine flow path along the valley line 32 of the second plate member 18c and the fine flow path along the mountain line 32 of the intermediate plate member 18b merge. A joining flow path formed by the valley streak 32 of the second plate member 18c and the mountain streak 30 of the intermediate plate member 18b facing each other is denoted by reference numeral 26.
As shown in FIG. 3, the wall that defines the lower surface of the valley line 32 of the second plate-shaped member is in contact with the second surface 16b. A protrusion 28 is formed on the wall that defines the lower surface of the valley line 32 of the second plate-like member within the range where the merge channel 26 is formed. 5 and 6 show a portion where the protruding portion 28 is formed on the wall defining the lower surface of the valley line 32 of the second plate-like member. A protruding portion 28 is formed by making a U-shaped cut 29 in a wall defining the lower surface of the valley 32 and bending it.

If the protruding portion 28 is not formed, the coolant flows in a laminar flow along the valley line 32. As shown in FIG. 6, when the protruding portion 28 is formed, the flow of the coolant is disturbed by the protruding portion 28 and becomes a turbulent flow. Compared to the heat exchange rate between the plate member and the coolant when the coolant flows as a laminar flow along the plate member, the plate member and the cooling when the coolant flows as a turbulent flow The heat exchange rate between liquids is higher.
In the vicinity of the heating element, the temperature of the coolant rises and becomes higher than the surrounding coolant, and a temperature boundary layer may be formed. When the temperature boundary layer is formed, heat exchange between the coolant and the heating element is not sufficiently performed, and the cooling efficiency by the cooler may be reduced. If the protruding portion 28 is not provided, the coolant flows in a laminar flow along the plate-like member, and the temperature boundary layer may be maintained. Providing the protrusions 28 suppresses the formation of a temperature boundary layer because turbulent flow develops. Providing the protrusions 28 reduces the possibility that the cooling efficiency will decrease.
In this embodiment, since the protruding portion is formed on the inner wall in the range in contact with the first surface in contact with the heating element, a turbulent flow is caused at a position where the temperature boundary layer is easily formed (location along the heating element). And the generation of the temperature boundary layer can be more effectively prevented. Since the protrusion 28 is formed, the cooling efficiency of the cooler 4 is further improved.

As shown in FIG. 6, the depth H1 of the valley 32 of the second plate member 18c is equal to the height H1 of the mountain 30 of the intermediate plate member 18b. Although not shown, the depth of the valley line 32 of the intermediate plate member 18b is equal to the height of the mountain line 30 of the first plate member 18a. That is, the depth H1 of the mountain line 30 and the valley line 32 of the first plate member 18a, the mountain line 30 and the valley line 32 of the intermediate plate member 18b, and the mountain line 30 and the valley line 32 of the second plate member 18c are as follows. The depths are all equal and ensure a fine flow path with a size that does not clog foreign matter.
Further, the widths of the mountain line 30 and valley line 32 of the first plate member 18a, the mountain line 30 and valley line 32 of the intermediate plate member 18b, and the mountain line 30 and valley line 32 of the second plate member 18c are all equal. The width is such that a fine channel having a size that does not clog foreign matter is secured.
As shown in FIG. 6, the protrusion height H <b> 2 of the protrusion 28 is shorter than the depth H <b> 1 of the valley line 32. Moreover, the protrusion part 28 is formed in the confluence | merging flow path 26 where the mountain line 30 and the valley line 32 face each other, and the height is 2xH1. Therefore, a flow path of H1 or more is secured above the protrusion 28.
Even if the protrusion 28 is formed, a flow path having a size sufficient to prevent clogging of foreign matters is secured.

A similar event also exists between the first plate member 18a and the intermediate plate member 18b. That is, there is a range where the mountain line 30 of the first plate-like member 18a and the valley line 32 of the intermediate plate-like member 18b face each other, and in this range, as shown in FIG. 3, the mountain line 30 of the first plate-like member 18a. , And the merging channel 22 is formed by the merging of the minute channel along the valley path 32 of the intermediate plate member 18b.
A protrusion 24 is formed on the wall that defines the upper surface of the mountain line 30 of the first plate-like member 18a within the range in which the merge channel 22 is formed. The protrusion 24 also further improves the cooling efficiency of the cooler 4.

  FIG. 4 shows a material for forming the first plate member 18a, the intermediate plate member 18b, and the second plate member 18c. In the range of the first plate member 18a, the intermediate plate member 18b, and the second plate member 18c, a mountain line 30 and a valley line 32 that are bent in the ± y direction are formed. A protrusion 24 is formed in a range where the first plate member 18a is formed, and a protrusion 28 is formed in a range where the second plate member 18c is formed. By bending it as indicated by the arrow s, the inner wall 18 in which the first plate member 18a, the intermediate plate member 18b, and the second plate member 18c are laminated can be formed. Of course, the inner wall 18 may be formed by stacking three plates.

The range in which the mountain and valley lines face each other and the merge channel is formed is not limited to (6) in FIG. By adjusting the positional relationship between the mountain and valley lines, the merging flow paths 22 and 26 can be formed in the range shown in (7) of FIG. 7, or the merging flow in the range shown in (8) of FIG. Paths 22 and 26 can also be formed. The range in which the merge paths 22 and 26 are formed is not particularly limited.
In the present embodiment, the first protrusion 24 and the second protrusion 28 are formed. When the heating element exists only on the first surface 16a side, the second protrusion 28 may not be formed. Alternatively, when the heating element exists only on the second surface 16b side, the first protrusion 24 may not be formed.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

2: Laminated structure 4: Cooler (4a: 1st cooler to 4l: 12th cooler)
6: heating element (6a: first heating element to 6k: eleventh heating element)
Subscript A indicates the left heating element, and subscript B indicates the right heating element.
8: Inflow pipes 8a to 8k: Communication pipe 10: Outflow pipes 10a to 10k: Communication pipe 12: Inflowing coolant 14: Outflowing coolant 16: Outer wall 16a: First surface 16b: Second surface 17: Coolant flow Path 18: Inner wall Subscript A indicates the left inner wall, Subscript B indicates the right inner wall 18a: First plate member 18b: Intermediate plate member 18c; Second plate member 20: Fine channel 22: Merged channel 24: Protruding part 26: Merged channel 28: Protruding part 29: U-shaped cut 30: Mountain line 32: Valley line

Claims (4)

A cooler used by passing a coolant in contact with at least one heating element;
An outer wall defining a flow path through which the coolant passes, and an inner wall accommodated in the flow path,
When the direction in which the coolant passes is the passing direction, the direction orthogonal to the passing direction is the stacking direction, and the direction orthogonal to the passing direction and the stacking direction is the bending direction,
The outer wall includes a first surface extending along a plane including a passing direction and a bending direction and contacting the heating element, and a second surface extending at a distance from the first surface in the stacking direction,
The inner wall is accommodated in the flow path in a state where a plurality of plate-like members parallel to the first surface are stacked in the stacking direction,
Each plate-like member has a shape in which a mountain line bulging on the first surface side and a valley line bulging on the second surface side are alternately repeated in the bending direction,
Each mountain line and each valley line extend in the passing direction and are displaced in the bending direction while inverting the displacement direction at a predetermined wavelength.
The phase of the mountain line formed in one plate-like member adjacent in the stacking direction and the valley line formed in the other plate-like member are out of phase, and the mountain surface and the valley line intersect with each other. A cooler, wherein a plate-like member within a range in contact with the first member is formed with a first protrusion that protrudes toward the second surface. The height of the mountain lines formed in each plate-like member is equal,
The cooler according to claim 1, wherein the protrusion length of the first protrusion is shorter than the height of the mountain line. A cooler used in a state of being arranged between a plurality of heating elements,
The first surface and the second surface are parallel,
3. The cooling according to claim 1, wherein a second projecting portion projecting toward the first surface is formed on a plate-like member within a range where the mountain line and the valley line intersect and in contact with the second surface. vessel. A first plate member in contact with the first surface, an intermediate plate member, and a second plate member in contact with the second surface are sequentially laminated to form an inner wall,
A first projecting portion projecting toward the second surface is formed on the first plate-shaped member within a range in contact with the first surface while the mountain line of the first plate-shaped member intersects with the valley of the intermediate plate-shaped member. And
A second projecting portion projecting toward the first surface is formed on the second plate-shaped member within a range in contact with the second surface while the valley of the second plate-shaped member intersects with the mountain streak of the intermediate plate-shaped member. The cooler according to claim 3.

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