Liquid cooling jacket and cooling system

Abstract

In the present invention, taking the downstream side of this liquid cooling jacket as one side in a first direction and the upstream side as the other side in the first direction, when the number of protrusions l is even, the numbers n = 1 to m (where m = l / 2) are assigned to the protrusions in order, respectively, from the furthest other side in the first direction toward the one side in the first direction, and from the furthest one side in the first direction toward the other side in the first direction, and when the number of protrusions l is odd, the numbers n = 1 to m (where m = (l+1) / 2) are assigned to the protrusions in order, respectively, from the furthest other side in the first direction toward the one side in the first direction, and from the furthest one side in the first direction toward the other side in the first direction, and the gap in a third direction between the protrusions and a heat dissipation member decreases progressively for protrusions assigned with greater numbers.

Description

Liquid cooling jacket and cooling system

[0001] The present disclosure relates to a liquid cooling jacket.

[0002] A water jacket for water cooling is known. The water jacket houses a heat dissipation member. The interior of the water jacket serves as a cooling water flow path, and a heat generating element is water-cooled via the heat dissipation member (see, for example, Patent Document 1).

[0003] JP 2015-220382 A

[0004] Here, the water jacket is required to not only improve cooling performance but also suppress pressure loss. If pressure loss becomes too great, the desired flow rate may not be achieved depending on the performance of the pump circulating the cooling water. Alternatively, a large, expensive pump may be required to achieve the desired flow rate.

[0005] In view of the above circumstances, an object of the present disclosure is to provide a liquid cooling jacket that can achieve both improved cooling performance and reduced pressure loss.

[0006] An exemplary liquid cooling jacket of the present disclosure has a first direction which is the direction along the flow of the refrigerant, a second direction which is perpendicular to the first direction, and a third direction which is perpendicular to the first and second directions, and has a refrigerant flow path which has a width in the second direction and is capable of arranging a heat dissipation member on one side in the third direction, a bottom surface portion which is located on the other side of the refrigerant flow path in the third direction, and three or more protrusions which protrude from the bottom surface portion to one side in the third direction and are arranged in the first direction. With one side in the first direction as the downstream side and the other side in the first direction as the upstream side, if the number l of the protrusions is an even number, the protrusions are assigned numbers n=1 to m (where m=l / 2) in order from the farthest side in the other direction of the first direction to the one side in the first direction, and from the farthest side in the one direction of the first direction to the other side in the first direction, respectively; if the number l of the protrusions is an odd number, the protrusions are assigned numbers n=1 to m (where m=(l+1) / 2) in order from the farthest side in the other direction of the first direction to the one side in the first direction, and from the farthest side in the one direction of the first direction to the other side in the first direction, respectively; the larger the number assigned to the protrusion, the smaller the gap in the third direction between the protrusion and the heat dissipation member.

[0007] According to the exemplary liquid cooling jacket of the present disclosure, it is possible to achieve both improved cooling performance and reduced pressure loss.

[0008] FIG. 1 is an exploded perspective view of a cooling system according to an exemplary embodiment of the present disclosure. FIG. 2 is a plan view of the cooling system viewed from one side (above) in a third direction. FIG. 3 is a side cross-sectional view of the cooling system. FIG. 4 is a plan view of a liquid cooling jacket viewed from one side in the third direction. FIG. 5 is a side cross-sectional view of an enlarged protrusion. FIG. 6 is a diagram showing a protrusion according to a comparative example. FIG. 7 is a schematic diagram of a protrusion for explaining the size relationship of gaps. FIG. 8 is a table showing the relationship between numbers assigned to protrusions and gaps (when the number of protrusions is six). FIG. 9 is a table showing the relationship between numbers assigned to protrusions and gaps (when the number of protrusions is seven). FIG. 10 shows a first example of a partial cross-sectional view of a cooling system taken along a cross section perpendicular to the first direction. FIG. 11 shows a second example of a partial cross-sectional view of a cooling system taken along a cross section perpendicular to the first direction. FIG. 12 shows a third example of a partial cross-sectional view of a cooling system taken along a cross section perpendicular to the first direction. FIG. 13 is a side cross-sectional view showing a modified example of a protrusion.

[0009] Exemplary embodiments of the present disclosure will now be described with reference to the drawings.

[0010] In the drawings, the first direction is designated as the X direction, with X1 representing one side of the first direction and X2 representing the other side. The first direction is the direction along the flow direction F of the refrigerant W, with the downstream side designated as F1 and the upstream side designated as F2. The downstream side F1 is the one side of the first direction, and the upstream side F2 is the other side of the first direction. The second direction perpendicular to the first direction is designated as the Y direction, with Y1 representing one side of the second direction and Y2 representing the other side of the second direction. The third direction perpendicular to the first and second directions is designated as the Z direction, with Z1 representing one side of the third direction and Z2 representing the other side of the third direction. Note that the term "perpendicular" as used above also includes intersections at angles slightly different from 90 degrees. The above directions do not limit the orientation of the cooling system 1 when it is incorporated into various devices.

[0011] <Configuration of cooling system> Fig. 1 is an exploded perspective view of a cooling system 1 according to an exemplary embodiment of the present disclosure. Fig. 2 is a plan view of the cooling system 1 as viewed from one side (above) in a third direction. Fig. 3 is a side cross-sectional view of the cooling system 1. Fig. 3 is a view of the cooling system 1 cut along a cutting plane perpendicular to the second direction as viewed from the second direction. Fig. 4 is a plan view of the liquid cooling jacket 2 as viewed from one side in the third direction.

[0012] The cooling system 1 includes a liquid-cooled jacket 2 and a heat dissipation member 3. The cooling system 1 is a device that cools a plurality of heat generating elements 4A, 4B, 4C, 4D, 4E, and 4F (hereinafter referred to as 4A, etc.) using a refrigerant W. The refrigerant W is a liquid such as water. That is, the cooling system 1 performs liquid cooling such as water cooling. The number of heat generating elements is not limited to six, but may be three or more. Furthermore, the heat generating elements are not limited to being arranged in a single row as shown in FIG. 2 , but may also be arranged in multiple rows (e.g., two rows x six elements).

[0013] The liquid cooling jacket 2 is a die-cast product made of metal such as aluminum, and has a flow path therein for allowing a coolant W to flow.

[0014] Specifically, the liquid cooling jacket 2 has a refrigerant flow path 20 and an outlet flow path 204 (FIG. 4). The outlet flow path 204 is located at one end of the liquid cooling jacket 2 in the first direction and extends in the first direction. However, the outlet flow path is not limited to the first direction, and may extend in the second or third direction. The liquid cooling jacket 2 also has an inlet flow path (not shown).

[0015] The coolant flow path 20 includes a first flow path 201, a second flow path 202, and a third flow path 203. The first flow path 201 is provided on the other side in the first direction in the liquid cooling jacket 2, has a width in the second direction, and is recessed on the other side in the third direction. The one end of the first flow path 201 in the third direction is connected to the other end of the second flow path 202 in the first direction. The second flow path 202 has a width in the second direction and extends in the first direction. The one end of the second flow path 202 in the first direction is connected to the one end of the third flow path 203 in the third direction. The third flow path 203 is provided on one side in the first direction in the liquid cooling jacket 2, has a width in the second direction, and is recessed on the other side in the third direction. The other end of the third flow path 203 in the third direction is connected to the other end of the outlet flow path 204 in the first direction. In other words, the coolant flow path 20 has a width in the second direction.

[0016] The inlet flow path (not shown) is disposed on the other side of the first flow path 201 in the second direction and is connected to the other end of the first flow path 201 in the third direction. The first flow path 201 has an opening (not shown) on the other side of the other end in the third direction in the second direction, and the inlet flow path is connected to this opening. Therefore, the refrigerant W flows from the inlet flow path into the first flow path 201 in the second direction. However, the flow direction from the inlet flow path to the first flow path 201 is not limited to the second direction, and may be the first direction or the third direction.

[0017] As a result, the coolant W that flows from the inlet flow path into the first flow path 201 proceeds to one side in the third direction, flows into the second flow path 202 and flows through the second flow path 202 to one side in the first direction, flows into the third flow path 203 and proceeds to the other side in the third direction, flows into the outlet flow path 204 and is discharged outside the liquid cooling jacket 2.

[0018] Here, the heat dissipation member 3 is a rectangular parallelepiped flat plate having sides extending in the first direction, the second direction, and the third direction, and has a thickness in the third direction. The heat dissipation member 3 is, for example, a copper plate. When the heat dissipation member 3 is not attached to the liquid cooling jacket 2, one side in the third direction of each of the first flow path 201, the second flow path 202, and the third flow path 203 is exposed to the outside. The heat dissipation member 3 is attached to the liquid cooling jacket 2 by being arranged on one side in the third direction of each of the first flow path 201, the second flow path 202, and the third flow path 203. As a result, one side in the third direction of each of the first flow path 201, the second flow path 202, and the third flow path 203 is not exposed to the outside.

[0019] That is, the liquid cooling jacket 2 has a refrigerant flow path 20 in which the heat dissipation member 3 can be arranged on one side in the third direction. The liquid cooling jacket 2 also includes a flat heat dissipation member 3 that is arranged on one side in the third direction of the refrigerant flow path 20 and that extends in the first and second directions and has a thickness in the third direction.

[0020] Conventionally, pin fins have been provided on heat dissipation members to increase the surface area of ​​the heat dissipation surface. However, providing pin fins increases the number of parts, increases work time, and requires high part precision, resulting in increased costs. In contrast, even in a flat heat dissipation member like the heat dissipation member 3, providing protrusions 21A or the like as described below increases the flow rate of the refrigerant W and improves cooling performance. Therefore, it is possible to achieve both improved cooling performance and reduced pressure loss while suppressing costs, as described below.

[0021] The heating elements 4A, etc. are, for example, IGBT (insulated gate bipolar transistor) modules and are arranged side by side in the first direction. The heating elements 4A, etc. are in direct or indirect contact with one side surface 3A in the third direction of the heat dissipation member 3. When the heating elements 4A, etc. are in indirect contact with one side surface 3A in the third direction, they are in contact via, for example, an insulating sheet. Heat generated from the heating elements 4A, etc. is transferred via the heat dissipation member 3 to the refrigerant W flowing through the second flow path 202, thereby cooling the heating elements 4A, etc.

[0022] <Configuration of protrusions> The liquid cooling jacket 2 has protrusions 21A, 21B, 21C, 21D, 21E, and 21F (hereinafter referred to as 21A, etc.). Six protrusions 21A, etc. are arranged in the first direction. The number of protrusions is six, matching the number of heating elements 4A, etc. The number of protrusions is not limited to six, and may be three or more. In other words, it is sufficient that three or more protrusions 21A, etc. are arranged in the first direction. Accordingly, it is sufficient that the number of heating elements is also three or more.

[0023] The protrusions 21A etc. protrude toward one side in the third direction from a bottom surface BT that is located on the other side in the third direction of the second flow path 202. That is, the liquid cooling jacket 2 has a bottom surface BT that is located on the other side in the third direction of the refrigerant flow path 20, and three or more protrusions 21A etc. that protrude from the bottom surface BT toward one side in the third direction.

[0024] Here, Fig. 5 is an enlarged side cross-sectional view of the protrusion 21A etc. Hereinafter, the reference numerals for the protrusion 21A etc. may be denoted as "21". As shown in Fig. 5, the protrusion 21 has an inclined portion 211, a top surface portion 212, and an upstream wall surface portion 213. The inclined portion 211 is provided on one side of the protrusion 21 in the first direction, which is the downstream side, and is inclined toward one side in the first direction and toward the other side in the third direction.

[0025] The protrusion 21 has a top surface 212 on one side in the third direction. The top surface 212 is a flat surface that extends linearly in the first direction. One end of the top surface 212 in the first direction is connected to the other end of the inclined portion 211 on the other side in the first direction. The upstream wall surface 213 is a flat surface that extends perpendicular to the bottom surface BT of the top surface 212 on one side in the third direction.

[0026] 6 shows, for comparison, a protrusion 21X having a downstream wall surface 210 extending perpendicular to the bottom surface BT in the third direction, rather than an inclined portion 211 on one side in the first direction. The provision of the protrusion 21X narrows the gap between the protrusion 21X and the heat dissipation member 3, increasing the flow rate of the refrigerant W and facilitating the generation of turbulence, thereby improving the cooling performance of the heat-generating body 4A and the like. However, without the inclined portion 211, a vortex Vx is generated downstream of the protrusion, resulting in increased pressure loss.

[0027] In contrast, in the protrusion 21 of this embodiment, as shown in Fig. 5, the length L in the first direction of the inclined portion 211 is longer than the height H1 in the third direction of the protrusion 21 at the other end of the inclined portion 211 in the first direction. This allows the inclined portion 211 to cover the area where vortices are formed downstream of the protrusion, suppressing the formation of vortices and reducing pressure loss. Therefore, the protrusion 21 makes it possible to ensure cooling performance while suppressing pressure loss.

[0028] 5, the protrusion 21 has a curved surface 214. The curved surface 214 connects the other end of the top surface 212 in the first direction to the one end of the upstream wall surface 213 in the third direction, and is inclined toward the other side in the first direction and the other side in the third direction. By providing the curved surface 214 in addition to the inclined portion 211 in this way, pressure loss can be further suppressed.

[0029] 5 , a gap S in the third direction is provided between the top surface 212 of the protrusion 21 and the heat dissipation member 3, and the refrigerant W flows through the gap S. The configuration of this gap S will be described below.

[0030] 7 is a schematic diagram of the protrusions 21A and the like to explain the size relationship of the gaps S. Here, the lengths (unit: mm) of the gaps S between the heat dissipation member 3 and each of the protrusions 21A to 21F are denoted as A1, A2, A3, B3, B2, and B1, respectively.

[0031] 7, protrusions 21A to 21C are numbered sequentially from 1 toward one side in the first direction, starting from protrusion 21A located closest to the other side (upstream side), and are numbered 1, 2, and 3. Furthermore, protrusions 21F to 21D are numbered sequentially from 1 toward the other side in the first direction, starting from protrusion 21F located closest to one side (downstream side), and are numbered 1, 2, and 3.

[0032] FIG. 8 is a table showing the relationship between the numbers assigned to the protrusions 21A and 21B and the gaps. As shown in FIG. 8, the size relationship of the gaps is A1, B1 > A2, B2 > A3, B3. That is, the larger the number assigned to the protrusion, the smaller the gap. For the heating elements 4C and 4D (FIG. 2) arranged on the inside in the first direction, which is the direction in which the heating elements 4A and 4B are arranged, the heating elements (4B, 4D, or 4C, 4E) are arranged on both sides in the first direction, making it difficult for heat to escape. Therefore, the gaps A3 and B3 are small for the protrusions 21C and 21D on the inside in the first direction, where cooling performance is relatively required. On the other hand, for the heating elements 4A and 4F arranged on the outside in the first direction, no heating elements are arranged on either side in the first direction, respectively. Therefore, the gaps A1 and B1 are large for the protrusions 21A and 21F on the outside in the first direction, where cooling performance is relatively unnecessary. This allows for both improved cooling performance and reduced pressure loss. For example, compared to when gap lengths A1, A2, A3, B3, B2, and B1 are all set to the same value, the maximum value among the maximum temperatures reached by heating elements 4A to 4F can be reduced.

[0033] Generalizing the above configuration, when the number l of protrusions 21 is an even number (for example, 6), the protrusions 21 are assigned numbers n = 1 to m (where m = l / 2) in order from the side furthest from the other side in the first direction to the side furthest from the one side in the first direction, and from the side furthest from the one side in the first direction to the other side in the first direction, and the larger the number assigned to the protrusion 21, the smaller the gap in the third direction between the protrusion 21 and the heat dissipation member 3.

[0034] In addition, in the case where the number of protrusions 21 is seven as an example of an odd number, protrusions 21A to 21G are lined up from the other side to one side in the first direction. The lengths of the gaps between each of protrusions 21A to 21G and heat dissipation member 3 are denoted as A1, A2, A3, A4, B3, B2, and B1. Starting from protrusion 21A closest to the other side in the first direction toward one side in the first direction, protrusions 21A to 21D are numbered sequentially, starting from 1, and are numbered 1, 2, 3, and 4. In addition, starting from protrusion 21G closest to the one side in the first direction toward the other side in the first direction, protrusions 21G to 21D are numbered sequentially, starting from 1, and are numbered 1, 2, 3, and 4.

[0035] Fig. 9 is a table showing the relationship between the numbers assigned to the protrusions 21A to 21G and the gaps. As shown in Fig. 9, the size relationships of the gaps are A1, B1 > A2, B2 > A3, B3 > A4. In other words, the larger the number assigned to the protrusion, the smaller the gap. This also achieves the same effect as above.

[0036] Generalizing the above configuration, when the number l of protrusions 21 is an odd number (for example, 7), the protrusions 21 are numbered n = 1 to m (where m = (l + 1) / 2) in order from the side furthest from the other side in the first direction to the side furthest from the one side in the first direction, and from the side furthest from the one side in the first direction to the other side in the first direction, and the larger the number assigned to the protrusion 21, the smaller the gap in the third direction between the protrusion 21 and the heat dissipation member 3.

[0037] Furthermore, the gaps between two protrusions 21 with the same number are either gaps with the same length in the third direction or gaps with different lengths in the third direction. That is, in the example of Figure 8 or Figure 9, A1 = B1, or A1 > B1, or A1 < B1, A2 = B2, or A2 > B2, or A2 < B2, and A3 = B3, or A3 > B3, or A3 < B3. In this way, the gaps can be adjusted to obtain the required cooling performance and pressure loss.

[0038] <Distribution of gaps in second direction> Next, the distribution of gaps between the protrusions 21 and the heat dissipation member 3 in the second direction will be described. Fig. 10 shows a first example of a partial cross-sectional view of the cooling system 1 in a cross section perpendicular to the first direction. In the configuration shown in Fig. 10, the gap S between the protrusions 21 and the heat dissipation member 3 is constant throughout the entire area in the second direction. In other words, the gap S for at least one of the protrusions 21 is constant in the second direction. This makes it easier to design the gaps.

[0039] 11 shows a second example of a partial cross-sectional view of the cooling system 1 perpendicular to the first direction. In the configuration shown in FIG. 11 , the gap between the protrusion 21 and the heat dissipation member 3 is such that the gap S on one side in the second direction is small and the gap S2 on the other side in the second direction is large. The gap S is constant on one side in the second direction, and the gap S2 is constant on the other side in the second direction. That is, a step D is provided in the protrusion 21 at the point where the gaps S and S2 change over.

[0040] 12 shows a third example of a partial cross-sectional view of the cooling system 1 taken along a cross section perpendicular to the first direction. In the configuration shown in Fig. 12, the top surface 212 of the protrusion 21 is tapered in cross section. As a result, the gap S between the protrusion 21 and the heat dissipation member 3 becomes continuously smaller toward one side in the first direction.

[0041] 11 and 12 , the gap for at least one of the protrusions 21 changes in the second direction. This allows the cooling performance to be adjusted in the second direction by the gap. For example, if two heat generating elements are arranged in the second direction, the gap can be narrowed for one heat generating element that generates a large amount of heat, thereby increasing the cooling performance, and the gap can be widened for the other heat generating element that generates a small amount of heat, thereby decreasing the cooling performance.

[0042] Furthermore, for example, when protrusions 21A-21F (see FIG. 1, etc.) are provided, it is preferable to apply a configuration in which the gap changes in the second direction for protrusion 21A arranged furthest to the other side (upstream side) in the first direction, as shown in FIG. 11 or 12. In this case, the gap is made larger on the other side in the second direction, where refrigerant W flows from the inlet flow path into first flow path 201 (see FIG. 11 or 12). That is, at least one of the protrusions includes protrusion 21A furthest to the other side in the first direction, and for the protrusion 21A furthest to the other side in the first direction, the gap is larger on the inflow side of refrigerant W into refrigerant flow path 20. By doing so, because the temperature of refrigerant W is lower on the side where refrigerant W flows into protrusion 21A on the most upstream side, by increasing the gap, it is possible to prevent unnecessary improvement in cooling performance and increased pressure loss.

[0043] <Range in which the top surface portion of the protrusion is formed> Next, the range in which the top surface portion 212 of the protrusion 21 is formed in the first direction will be described. As shown in Fig. 5 , the first direction range Wa in which the top surface portion 212 is formed is included in the first direction range Wb in which the heat generating element 4 is formed. In other words, the range Wa in which the top surface portion 212 is formed in the first direction at least partially overlaps with the range Wb in which the heat generating element 4, which can be arranged on one side of the heat dissipation member 3 in the third direction, is formed in the first direction. This allows the area in which the flow rate of the refrigerant W is increased by the gap S to overlap with the heat generating element 4, thereby further improving cooling performance.

[0044] 13 is a side cross-sectional view showing a modified example of the protrusion 21. In the configuration shown in FIG. 13, the heat generating element 4 has a package 41 and a heat sink 42. The heat sink 42 is disposed on the other side of the package 41 in the third direction. That is, the heat generating element 4 has the heat sink 42 on the other side in the third direction. The heat sink 42 is in direct or indirect contact with the heat dissipation member 3. Heat generated in the package 41 is transferred to the refrigerant W via the heat sink 42 and the heat dissipation member 3.

[0045] The first direction end positions of the top surface portion 212 coincide with the first direction end positions of the heat sink 42. This allows the flow speed of the refrigerant W to be increased over the entire first direction area of ​​the heat sink 42, thereby further improving cooling performance. In this case, the entire first direction range Wa in which the top surface portion 212 is formed overlaps with the first direction range Wb of the heat sink 42.

[0046] <Others> The embodiments of the present disclosure have been described above. Note that the scope of the present disclosure is not limited to the above-described embodiments. The present disclosure can be implemented by adding various modifications to the above-described embodiments without departing from the spirit of the invention. Furthermore, the matters described in the above-described embodiments can be combined in any appropriate manner as long as no contradictions arise.

[0047] <Notes> As described above, the liquid cooling jacket according to one aspect of the present disclosure comprises: a first direction which is a direction along the direction in which the refrigerant flows, a second direction which is a direction orthogonal to the first direction, and a third direction which is a direction orthogonal to the first and second directions; a refrigerant flow path which has a width in the second direction and which allows a heat dissipation member to be arranged on one side in the third direction; a bottom surface portion which is located on the other side in the third direction of the refrigerant flow path; and three or more protrusions which protrude from the bottom surface portion on one side in the third direction and are arranged in the first direction, with the one side in the first direction being the downstream side and the other side in the first direction being the upstream side, and when the number l of the protrusions is an even number, the protrusions are numbered n=1 to m (where m=l / 2) from the side closest to the other side in the first direction to the one side in the first direction, and from the side closest to the one side in the first direction to the other side in the first direction, When the number l of the protrusions is odd, the protrusions are assigned numbers n = 1 to m (where m = (l + 1) / 2) in order from the farthest side in the other direction of the first direction to the farthest side in the first direction, and from the farthest side in the one direction of the first direction to the farthest side in the first direction, respectively, and the larger the number assigned to the protrusion, the smaller the gap in the third direction between the protrusion and the heat dissipation member (first configuration).

[0048] In addition, in the above-mentioned first configuration, the gaps for two of the protrusions having the same number may be either gaps having the same third-direction length or gaps having different third-direction lengths (second configuration).

[0049] In the first or second configuration, the gap for at least one of the protrusions may be constant in the second direction (third configuration).

[0050] In the first or second configuration, the gap for at least one of the protrusions may vary in the second direction (fourth configuration).

[0051] In addition, in the above-mentioned fourth configuration, at least one of the protrusions may include the protrusion that is furthest on the other side in the first direction, and the gap may be larger on the inflow side of the refrigerant into the refrigerant flow path for the protrusion that is furthest on the other side in the first direction (fifth configuration).

[0052] Furthermore, in any of the first to fifth configurations, the protrusion portion may have a top surface on one side in the third direction, and the range of the top surface formed in the first direction may at least partially overlap with the range formed in the first direction of a heat generating element that can be arranged on one side in the third direction of the heat dissipation member (sixth configuration).

[0053] In addition, in the sixth configuration, the heat generating element may have a heat sink on the other side in the third direction, and the positions of both ends of the top surface in the first direction may coincide with the positions of both ends of the heat sink in the first direction (seventh configuration).

[0054] Furthermore, a cooling system according to one aspect of the present disclosure comprises a liquid cooling jacket having any one of the first to seventh configurations described above; a flat heat dissipation member arranged on one side of the refrigerant flow path in the third direction, extending in the first and second directions and having a thickness in the third direction; and three or more heat generating elements arranged in the first direction on one side of the heat dissipation member in the third direction (eighth configuration).

[0055] The present disclosure can be used for cooling in a variety of applications.

Claims

1. With the direction along the flow direction of the refrigerant as the first direction, the direction orthogonal to the first direction as the second direction, and the direction orthogonal to the first and second directions as the third direction, a refrigerant flow path having a width in the second direction and capable of disposing a heat radiating member on one side in the third direction, a bottom surface portion located on the other side in the third direction of the refrigerant flow path, and projections protruding from the bottom surface portion to one side in the third direction and arranged in three or more in the first direction. With the downstream side being one side in the first direction and the upstream side being the other side in the first direction, when the number l of the projections is an even number, numbers are sequentially assigned to the projections from the other side in the first direction to one side in the first direction and from one side in the first direction to the other side in the first direction as n = 1 to m (where m = l / 2). When the number l of the projections is an odd number, numbers are sequentially assigned to the projections from the other side in the first direction to one side in the first direction and from one side in the first direction to the other side in the first direction as n = 1 to m (where m = (l + 1) / 2). The gap in the third direction between the projection and the heat radiating member is smaller for the projection with a larger assigned number. A liquid cooling jacket.

2. The gap between two of the projections with the same number is either a gap with the same third direction length or a gap with different third direction lengths. The liquid cooling jacket according to claim 1.

3. The gap for at least any one of the projections is constant in the second direction. The liquid cooling jacket according to claim 1.

4. The gap for at least any one of the projections changes in the second direction. The liquid cooling jacket according to claim 1.

5. At least any one of the projections includes the projection on the other side in the first direction. For the projection on the other side in the first direction, the gap is large on the inflow side of the refrigerant into the refrigerant flow path. The liquid cooling jacket according to claim 4.

6. The projection has a top surface portion on one side in the third direction. The range formed in the first direction of the top surface portion overlaps at least partially with the range formed in the first direction of a heat generating body that can be disposed on one side in the third direction of the heat radiating member. The liquid cooling jacket according to claim 1.

7. The heat generating body has a heat radiating plate on the other side in the third direction. The positions of both ends in the first direction of the top surface coincide with the positions of both ends in the first direction of the heat radiating plate. The liquid cooling jacket according to claim 6.

8. A cooling system comprising the liquid cooling jacket according to any one of claims 1 to 7, and a flat heat radiating member disposed on one side in the third direction of the refrigerant flow path and extending in the first and second directions and having a thickness in the third direction.

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