cooler

Abstract

The present invention relates to a cooler comprising an inlet, an outlet, a first unit, and a second unit. The first unit has at least two fins, and the second unit has at least one fin. The fins are arranged and configured to form an inlet channel and a return channel for the coolant flowing from the inlet to the outlet. These channels are designed to cause the coolant to impact head-on on the wall of the first unit, which serves as the root of the first unit's fins. On its other side, this wall can accommodate the component to be cooled. After the impact, the coolant flows back through the return channel, which is offset relative to the inlet channel. This flow drift results in a particularly advantageous cooling effect.

Description

Technical Field

[0001] The present invention relates to a cooler which is particularly suitable for cooling electronic components or assemblies. Background Art

[0002] It's well known that with the continued advancement of power-related electronic components, the power dissipation and, consequently, the heat released by electronic assemblies is increasing. While these components are becoming increasingly smaller, their efficiency is increasing, and therefore the effort required to remove this heat is also increasing. Furthermore, due to their compactness, these electronic components are housed in smaller spaces, which again leads to higher localized heat release. When fan cooling is used, this power dissipation is only possible with complex and bulky cooling elements, making this unacceptable. Consequently, air cooling, with its high losses, has clearly reached its limits.

[0003] The new high-performance processor is approximately 10cm 2 The system delivers approximately 70 to 100W of power within a single area, thus achieving a much higher heat flux density. Processor manufacturers predict further increases in waste heat in the coming years. In light of this development, those skilled in the art are considering liquid cooling for this application. Liquid cooling more efficiently dissipates heat from electronic components, resulting in the potential for higher power density. Liquid coolers also allow for more compact switch cabinets with numerous electronic components and operate very quietly.

[0004] An exemplary universal cooling device is disclosed in EP 2 291 859 A1, in which an insert is arranged inside a cooling channel, the insert having a plurality of pins which form a channel towards the cooler wall and are supplied with coolant via openings in an inclined surface of an inlet which is hit by the coolant flow from the coolant channel. Summary of the Invention

[0005] The present invention provides an improved cooler which, while being as compact as possible, allows for a more efficient cooling structure and a lighter, simpler design.

[0006] The present invention relates to a cooler, which includes an inlet, an outlet, a first unit, and a second unit. The inlet is configured to supply a coolant to the cooler, and the outlet is configured to discharge the coolant. The first unit includes a first plane for receiving a first part to be cooled, a first fin of the first unit, and a second fin of the first unit. The first fin of the first unit extends from a first root of the first unit to a front portion of the first fin of the first unit, and the second fin of the first unit extends from the first root of the first unit to a front portion of the second fin of the first unit. The first plane is in uninterrupted thermal contact with the first root of the first unit. The first fin of the first unit has a first surface of the first fin of the first unit, and the first second fin of the first unit has a first surface of the second fin of the first unit. The second unit includes the first fin of the second unit, and the first fin of the second unit has a first front portion of the first fin of the second unit, a first surface of the first fin of the second unit, and a second surface of the first fin of the second unit. The second unit first fin is at least partially located between the first unit first fin and the first unit second fin, so that the first unit first root is adjacent to the second unit first fin first front, leaving a first gap, the first unit first fin first surface is adjacent to the second unit first fin first surface, and the first unit second fin first surface is adjacent to the second unit first fin second surface, at least one of the first unit first fin first surface and the second unit first fin first surface has a first corrugated structure, the first corrugated structure forms a plurality of first inlet channels between the first unit first fin first surface and the second unit first fin first surface, at least one first inlet channel is configured to: form a first coolant inlet flow from the first unit first fin first front toward the first unit first root, and cause the first coolant inlet flow to impinge on the first unit first root and widen laterally.

[0007] At least one of the first surface of the first unit second fin and the second surface of the second unit first fin may have a second corrugated structure, the second corrugated structure forming a plurality of first reverse channels between the first surface of the first unit second fin and the second surface of the second unit first fin, the first reverse channels being offset relative to the first inlet channel, and each of the two adjacent first reverse channels closest to the first inlet channel being configured to: receive a portion of the first coolant inlet flow that is impacted and widened, and form a first coolant reverse flow from the first unit first root toward the front of the first unit second fin.

[0008] In another embodiment, the first front portion of the second unit first fin may be the front portion of the second unit first fin, the first unit second fin has the first unit second fin second surface, the second unit includes the second unit second fin, the second unit second fin has the second unit second fin front portion and the second unit second fin first surface, the second unit first fin extends from the second unit first root to the second unit first fin front portion, the second unit second fin extends from the second unit first root to the second unit second fin front portion, the first unit second fin is located between the second unit first fin and the second unit second fin, so that the second unit first root is adjacent to the first unit second fin front portion, thereby leaving a second gap, the first unit second fin second surface is adjacent to the second unit second fin first surface, the first reverse channel is the second inlet channel, and the first cold channel is the second cold channel. The coolant reverse flow is a second coolant inlet flow, and at least one second inlet channel is configured to form the second coolant inlet flow from the front of the second unit first fin toward the second unit first root, so that the second coolant inlet flow hits the second unit first root and becomes laterally widened, at least one of the first surface of the second unit second fin and the second surface of the first unit second fin has a third corrugation structure, and the third corrugation structure forms a plurality of second reverse channels between the first surface of the second unit second fin and the second surface of the first unit second fin, the second reverse channels are offset relative to the second inlet channel, and each of the two adjacent second reverse channels closest to the second inlet channel is configured to receive a portion of the second coolant inlet flow that is hit and widened, and form a second coolant reverse flow from the second unit first root toward the front of the second unit second fin.

[0009] The second unit first fin may have a second unit first fin second front portion opposite to the second unit first fin first front portion, wherein the cooler includes a third unit, the third unit includes a third unit first fin and a third unit second fin, the third unit first fin extends from the third unit first root portion to the third unit first fin front portion, the third unit second fin extends from the third unit first root portion to the third unit second fin front portion, the third unit first fin has a third unit first fin first surface, and the third unit second fin has a third unit second fin first surface.

[0010] In other embodiments, the second unit first fin is further at least partially located between the third unit first fin and the third unit second fin, so that the third unit first root is adjacent to the second unit first fin second front, thereby leaving a third gap, the third unit first fin first surface is adjacent to the second unit first fin first surface, and the third unit second fin first surface is adjacent to the second unit first fin second surface.

[0011] The second unit first fin may further be positioned at least partially adjacent to the third unit first fin such that the third unit first root is adjacent to the second unit first fin second front, thereby leaving a fourth gap, the third unit first fin first surface being adjacent to the second unit first fin second surface, the third unit first root being arranged to receive coolant from the inlet.

[0012] The third unit may include a flat surface for receiving the second part to be cooled and the third flat surface may be in uninterrupted thermal contact with the first root of the third unit.

[0013] The cooler may be an electronic component cooler, and the first part to be cooled may be an electronic component.

[0014] In another embodiment, the second unit may be made of plastic material.

[0015] The inlet may be arranged and configured upstream of the first gap, and the outlet may be arranged and configured downstream of the first reverse channel.

[0016] In another embodiment, the first unit or the second unit is a fin-shaped member made of a material including aluminum.

[0017] The first unit first root portion may be configured to cause the first coolant inlet flow to be split into two partial flows, and the two partial flows enter the two adjacent first reversing channels.

[0018] In another embodiment, the first unit first root is on one side of a thermally conductive cooler wall, and the first plane is on an opposite side of the thermally conductive cooler wall.

[0019] The first unit and the second unit may be configured to form a housing.

[0020] In another embodiment, the first unit and the third unit are configured to form a housing, and in particular, the second unit is configured to form the housing in combination with the first unit and the third unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By way of example only, preferred embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which:

[0022] Figures 1 to 5 Showing different views of a first embodiment of a cooler according to the invention;

[0023] Figure 6 shows an abstract view of coolant flow through a cooler according to one embodiment of the present invention;

[0024] Figures 7 to 11 Different possible aspects of embodiment of the cooler according to the invention are shown;

[0025] Figures 12 to 14 Different views showing other embodiments of the cooler according to the invention;

[0026] Figure 15 Other modifications of the embodiment of the cooler according to the invention are shown;

[0027] Figure 16 、 Figure 17 and Figure 18 shows further variant aspects of the embodiment of the cooler according to the invention;

[0028] Figure 19 and Figure 20 Showing different views of another embodiment of a cooler according to the invention;

[0029] Figure 21 and Figure 22 Different views showing a further embodiment of a cooler according to the invention;

[0030] Figure 23 An exemplary arrangement is shown of how the part to be cooled may be applied to a first plane. DETAILED DESCRIPTION

[0031] Figure 1A first embodiment of a cooler 1 according to the invention is shown. The cooler 1 has an inlet 2 and an outlet 3, a first unit 4 and a second unit 5. A first part 6 to be cooled, in particular an electronic component, is applied to a first surface 7 of the first unit 4. The cooler is supplied with coolant via the inlet 2, which is distributed more or less evenly along the long sides of the cooler in the lower part of the cooler and is then guided back and forth through a plurality of channels formed by the fins of the first and second units until it reaches the upper part of the cooler where it reaches the outlet 3, where the coolant is discharged. The forming members of the inlet 2 and / or outlet 3 can be integral parts of the first and / or second unit, or can be separate elements that can be connected to the first and second units. The first and second units can together form a housing. In a particular embodiment, the first and second units together form a housing with at least one of a separate inlet, a separate outlet and a separate wall element.

[0032] exist Figure 1 In the example shown in , the supplied coolant first comes into contact with the fins of the first unit. However, equally, the first fins that come into contact with the coolant can also come from the second unit. The fins of the first unit cross with the fins of the second unit, that is, they are put together so that the fins of the first unit alternate with the fins of the second unit. In this way, the coolant is passed back and forth at each turn, hitting the back of the plate having the first surface 7. Hereinafter, the impact area is named "root". The term "cross" will be interpreted as implying that the units involved (a) are in contact at least in some parts and (b) are not in contact at all at least in some parts.

[0033] To make it easier to understand the structure, Figure 2 Shown Figure 1 It should be noted that this structure is only an example. As will be shown below, the innovative principle can also be implemented with various other structures. Figure 2 The fins 9 in ("second unit fins") have a wavy profile. They extend from the root segment ("second unit root") to the front segment ("second unit front").

[0034] Figure 3 A cross-section along the long side and perpendicular to the alignment of the corrugated structure of the fin is shown. In this case, the first and second units are glued together, which is why in addition to the first unit fin 8, the second unit fin 9 is also visible here. Figure 3 A particular feature of the embodiments is that the longitudinal orientation of the fins is slightly tilted to further improve uniform longitudinal distribution of the coolant for achieving a uniform pressure drop. However, this tilt is optional and is not required in all embodiments of the present invention. For example, each of the corrugated structures may have a wavy pattern, a zigzag pattern, a meandering pattern, or a trapezoidal pattern.

[0035] Figure 4 The side view is shown so that the long side is substantially perpendicular to the paper and a single fin 8 of the first unit can be seen crossing a single fin 9 of the second unit. The coolant supplied to the cooler arrives under the first fin 8 of the first unit at the bottom, and the coolant is distributed under the first fin 8 at the bottom along the long side. The coolant then finds its way around the front segment F11 of the first fin to travel between the first fin of the first unit and the first fin of the second unit. Figure 6 Explaining the mechanism more generally: The travel between two fins takes place in channels which are formed by the corrugated structure on at least one of the participating fins.

[0036] Figure 5 The fins of the first unit and the second unit both have a wave-shaped Figures 1 to 4 An example of such channel formation in the structure of the fins. Figure 5 The direction from the first unit 4 to the second unit 5 is shown in more detail. Figure 3 This cross-sectional view corresponds to Figure 4 The section plane A indicated in Figure 5 As can be seen in FIG, the fins are arranged and abut each other so that the waveforms are offset relative to each other to form a channel. That is, the reverse channel is offset relative to the inlet channel by an offset O1.

[0037] The solid and dotted arrows indicate the flow of coolant. The solid arrow flow can be seen from the perspective of the cutting plane A, and the dotted arrow flow is the reverse flow that the fin actually covers from this perspective. Therefore, fin 8 is actually cut in this view, and from fin 9, the uncut front segment can be seen. The area of ​​the solid arrow is the root (segment) of the first unit where the cooling impact occurs. After the coolant from the incoming flow 10 hits the root forward, the coolant is divided into two flow parts, which are laterally diverted into the reverse channel 11 to reach the next "layer" or "level". This separation of the individual channel flows allows for additional cooling effects, thereby improving the overall efficiency. With the exception of the first incoming flow in the system, all other incoming flows are reverse flows from the corresponding previous incoming flows.

[0038] exist Figure 6An abstract side cross-section of a first embodiment is shown in FIG. The arrow head 12 indicates the direction out of the plane from the paper and shows an exemplary flow of coolant from the inlet supplying the cooler. Line 13 indicates the flow course of the coolant through the cooler, i.e. from the inlet 2 towards the outlet 3, wherein the arrow head 14 again points out of the plane, i.e. perpendicular to the paper, and indicates how the used coolant is discharged. Of course, the flow direction of the coolant in the inlet relative to the outlet can also be the opposite (from top to bottom). In particular, in Figure 1 In the view of FIG, the flow direction in the inlet and / or outlet is not necessarily perpendicular to the paper plane. In this first embodiment, the cooler can cool two parts 6 and 15 arranged on the plane of the units 4 and 5 respectively. These parts bearing planes are opposite sides of the respective roots of the units (see Figure 4 R11, R12 and R21, R22 in. Figure 6 Only two fins of the first unit 4 and the second unit 5 are shown, however this is only for illustrating the coolant flow principle and of course the respective assembly may comprise more fins.

[0039] although Figure 6 It is not described which fin and / or which side of the fin has the corrugated structure, but Figure 7 、 Figure 9 、 Figure 11 、 Figure 12 、 Figure 14 and Figure 15 Some of the various possibilities are shown.

[0040] according to Figures 1 to 5 The embodiment of the corrugation is composed of Figure 7 The double dashed lines mean that both sides of the fin have a corrugated structure, in this case a wave structure. Figure 8 In , other possibilities for a double-sided structure of the fin are shown, wherein, in the assembled condition (indicated by the arrows), the recesses abut. In other words, the structure does not necessarily have to be circular, it can also have a meandering shape with edges. Figure 7 、 Figure 9 、 Figure 11 、 Figure 12 、 Figure 15 、 Figure 16 and Figure 21 The sketches show the fins being spaced apart, however these figures are for illustration purposes only and are not to scale.

[0041] exist Figure 9 Other examples are shown abstractly in , where the fins are plates with a smooth surface on one side and corrugations on the other. Figure 10One embodiment of this is shown in the 3D view of FIG, in which the corrugation structure is achieved by grooves cut from the plate or strips added to the plate. When the first and second unit fins come into contact with their corrugations offset, they form an inlet channel 15 and a return channel 16. The impact on the root surface is indicated by a splash symbol, and the split is indicated by a double arrow indicating the direction of coolant flow. When we reach another embodiment further below, we will understand why Figure 9 There is uncertainty about the second cell wall or root. Figure 11 Shown in the opposite way Figure 9 and 10 The example of corresponds to the example of the fin structure.

[0042] use Figure 12 、 Figure 13 and Figure 14 Other embodiments of the combination of a first unit and a second unit of the cooler are shown, wherein the second unit can be made of a material that is cheaper to manufacture (e.g. plastic). The first unit having the surface for receiving the part to be cooled can be made of a material that conducts heat very well (e.g. aluminum). Figures 1 to 5 Compared to the wave structure fins shown, machining aluminum with smooth fins is easier. Figure 12 The first unit is shown on the left, having a smooth plate, and the second unit is shown on the right, having a double-sided corrugated structure. The second unit (which could be, but is not intended here) is not intended to receive parts to be cooled. The fins of the first and second units abut, at least so that an inlet channel 17 is formed. Specifically, the channel 17 is formed at least in the area leading to the fins of the second unit, i.e., just before the coolant enters the root area and impinges on the wall of the first unit. Figure 14 It shows how the fins are just abutting and how the coolant is redirected. In this case, the reverse channel 18 also starts in front of the second unit where the fins of the first unit are just abutting. It would be possible to keep a certain distance for the reverse flow so that no reverse "channel" is formed, but a reverse flow (see Figure 18 ). It must be noted that, most importantly, the incoming coolant formed by the channel impinges on the root area in the form of a jet which, after impinging on the root, will diverge or widen or swirl. In the example shown ( Figure 14 ), the reverse flow is immediately introduced into a reverse channel 18 which is arranged offset relative to the inlet channel 17. This channel offset O 2 will be understood with reference to an axis perpendicular to the channel and aligned parallel to the fins.

[0043] Figure 15A similar series is shown, where only the first unit 19 has double-sided structured fins and the second unit has straight fins and a second surface for receiving an electronic device to be cooled. A person skilled in the art will see various possibilities for applying the innovative principles.

[0044] Figure 16 The enlarged sketch shows that the fins of the first unit have an inclination relative to the fins of the second unit. This is shown as an example with double-sided structured fins per unit, but other structural series may also be applicable. Figure 17 This tilt is shown in a side view of a cross-fin. The inlet channel is formed just before the coolant impinges on the impact zone (root) at the corresponding root. As a result, the coolant is not introduced into the reverse channel after the impact. However, according to the present invention, the inlet channel, which forms a jet that rarely impinges on the root, still results in a beneficial cooling effect. After the impact, the coolant swirls around, generating a vortex. Figure 18 It is shown how the reverse flow is entering an open conduit rather than a biased channel known from other embodiments.

[0045] Figure 19 and Figure 20 The four parts of FIG. 1 show an embodiment with a first unit 21, a second unit 22 and a third unit 23. In this case, the second unit is an insert 22 with a double-sided corrugated structure. The second unit 22 includes each structured fin (not only Figure 19 The fins are marked in the figure, and the entire group). This group of fins can be clamped between the first unit 21 and the second unit 22. In order to fix the second unit 22 without blocking the root segment, the components 21, 23 can have a shoulder 24 for the front of the second unit to abut. However, other means such as notches on the fins of the second unit 22 can also be another embodiment for fixing the second unit 22 in the assembly. Due to the shoulder 24, the wave fin maintains a certain gap with the root, so that the coolant can flow through the root segment. Figure 20The configuration shown in the lower right portion of the diagram shows the coolant supply between the first unit 21 and the third unit 23 and is divided into two opposite directions, as shown, toward the first root of the first unit and the first root of the third unit. The fins of the second unit 22 abut the fins of the first and third units, forming channels through which the coolant flows. After striking the corresponding roots, it flows back to the other side of the second unit's fins, where the channels are also formed. In this area, the coolant is distributed to the next "layer" or "floor," that is, it flows around the second fins of the first and third units, where the second fins of the second unit again form the entry channels. This embodiment, while still providing innovative principles, is also relatively simple to manufacture. For example, a plastic injection-molded component can be used as the second unit, as it does not necessarily require good thermal conductivity; its primary purpose is to form the entry channel and the return channel, which is offset from the entry channel.

[0046] use Figure 21 and Figure 22 Another embodiment is shown in which the second unit 26 is a set of corrugated sheets, each of which has a bend in the middle. The first unit 25 and the third unit 27 are connected to Figure 19 and Figure 20 The fins of the second unit are similar to those in the embodiment of the invention (i.e., the ribbed aluminum parts), except that they are arranged offset relative to each other so that each fin can rest on one of the bends in the fins of the second unit. In the region of each bend in the fins of the second unit, there is an opening 28 for guiding the coolant. In this way, the coolant is guided through the labyrinth in an innovative manner, wherein after impact, the coolant flow is divided and discharged from the root region in offset, reverse channels.

[0047] Regardless of the method used to implement the cooler according to the present invention, the components to be cooled can be applied using the following configuration. The heat sink can be coated with a thermally sprayed ceramic for electrical insulation. An intermediate layer can be applied between the ceramic layer and the heat sink to relieve thermal stress. The semiconductor device (the component to be cooled) can be mounted using thermally conductive paste and mechanical fasteners or a thermally conductive adhesive. This special attachment method allows the electronic components to be electrically isolated, while dissipating the generated heat very efficiently.

[0048] exist Figure 23An exemplary configuration is shown in FIG. The first unit 29 has a surface for receiving a part 33 to be cooled at the opposite portion of the root (where the cooling impact occurs). Said surface may have a coating 30 that is only 100-300 microns thin, applied by flame spraying. For example, such a coating is made of Al2O3 or AlN. An intermediate layer 31 is optional and may consist of a copper-based material. The heat-conducting layer 32 may be, for example, a heat-conducting glue, paste or wax. Compared to solutions known in the art, this solution avoids the manufacturing step of welding and allows for fewer interfaces.

[0049] Although the present invention has been described above in part with reference to some preferred embodiments, it must be understood that various features of the embodiments can be modified and combined in numerous ways, all of which fall within the scope of the appended claims.

Claims

1. A cooler comprising an inlet, an outlet, a first unit and a second unit, The inlet is configured to supply coolant to the cooler, The outlet is configured to discharge the coolant, The first unit includes a first plane for receiving a first part to be cooled, a first unit first fin and a first unit second fin, The first fin of the first unit extends from the first root of the first unit to the front of the first fin of the first unit, The second fin of the first unit extends from the first root of the first unit to the front of the second fin of the first unit, The first plane is in continuous thermal contact with the first root of the first unit, The first unit first fin has a first unit first fin first surface, The first unit second fin has a first unit second fin first surface, The second unit includes a second unit first fin, The second unit first fin has a second unit first fin first front portion, a second unit first fin first surface, and a second unit first fin second surface. The second unit first fin is at least partially located between the first unit first fin and the first unit second fin, such that The first root of the first unit is adjacent to the first front of the first fin of the second unit, thereby leaving a first gap. The first surface of the first fin of the first unit is adjacent to the first surface of the first fin of the second unit, and The first surface of the second fin of the first unit is adjacent to the second surface of the first fin of the second unit, At least one of the first surface of the first fin of the first unit and the first surface of the first fin of the second unit has a first corrugated structure, The first corrugated structure forms a plurality of first inlet channels between the first surface of the first fin of the first unit and the first surface of the first fin of the second unit. At least one first entry channel is configured for forming a first coolant inlet flow from a first front portion of a first fin of the first unit toward a first root portion of the first unit, and The first coolant inlet flow is caused to impinge on the first root of the first unit and to widen laterally.

2. The cooler according to claim 1, wherein: At least one of the first surface of the first unit second fin and the second surface of the second unit first fin has a second corrugated structure, The second corrugated structure forms a plurality of first reverse channels between the first surface of the second fin of the first unit and the second surface of the first fin of the second unit. the first reverse channel is offset relative to the first entry channel, Each of the two adjacent first reverse channels closest to the first entry channel is configured to receiving a portion of the first coolant inlet flow that is impacted and widened, and A first coolant reverse flow is formed from the first root of the first unit toward the front of the second fin of the first unit.

3. The cooler according to claim 2, wherein: The first front portion of the first fin of the second unit is the first front portion of the first fin of the second unit, The first unit second fin has a first unit second fin second surface, The second unit includes a second unit second fin, The second unit second fin has a second unit second fin front portion and a second unit second fin first surface. The first fin of the second unit extends from the first root of the second unit to the front of the first fin of the second unit, The second fin of the second unit extends from the first root of the second unit to the front of the second fin of the second unit, The first unit second fin is located between the second unit first fin and the second unit second fin, such that The first root of the second unit is adjacent to the front of the second fin of the first unit, thereby leaving a second gap. The second surface of the second fin of the first unit is adjacent to the first surface of the second fin of the second unit, The first reverse channel is the second entry channel, The first coolant counterflow is the second coolant inflow, At least one second entry channel is configured for forming the second coolant inlet flow from the front of the first fin of the second unit toward the first root of the second unit, causing the second coolant inlet flow to impinge on the first root of the second unit and become laterally widened, At least one of the first surface of the second fin of the second unit and the second surface of the second fin of the first unit has a third corrugated structure, The third corrugated structure forms a plurality of second reverse channels between the first surface of the second fin of the second unit and the second surface of the second fin of the first unit. the second reverse channel is offset relative to the second entry channel, Each of the two adjacent second reverse channels closest to the second entry channel is configured to receiving a portion of the second coolant inlet flow that is impacted and widened, and A second coolant reverse flow is formed from the first root of the second unit toward the front of the second fin of the second unit.

4. The cooler according to claim 2, wherein: The second unit first fin has a second unit first fin second front portion opposite to the second unit first fin first front portion, The cooler includes a third unit, The third unit includes a third unit first fin and a third unit second fin, The first fin of the third unit extends from the first root of the third unit to the front of the first fin of the third unit, The second fin of the third unit extends from the first root of the third unit to the front of the second fin of the third unit, The third unit first fin has a third unit first fin first surface, The third-unit second fin has a third-unit second fin first surface.

5. The cooler according to claim 4, wherein: The second unit first fin is further at least partially located between the third unit first fin and the third unit second fin, such that The first root of the third unit is adjacent to the second front portion of the first fin of the second unit, thereby leaving a third gap. The first surface of the first fin of the third unit is adjacent to the first surface of the first fin of the second unit, and The first surface of the second fin of the third unit is adjacent to the second surface of the first fin of the second unit.

6. The cooler according to claim 4, wherein: The second unit first fin is further positioned at least partially adjacent to the third unit first fin such that The first root of the third unit is adjacent to the second front of the first fin of the second unit, thereby leaving a fourth gap. The first surface of the first fin of the third unit is adjacent to the second surface of the first fin of the second unit, The third unit first root is arranged to receive coolant from the inlet.

7. The cooler according to any one of claims 4 to 6, wherein: The third unit includes a flat surface for receiving a second part to be cooled, and The third plane is in continuous thermal contact with the first root of the third unit.

8. The cooler according to claim 1, wherein: The cooler is an electronic component cooler, and The first part to be cooled is an electronic component.

9. The cooler according to claim 1, wherein: The second unit is made of plastic material.

10. The cooler according to claim 2, wherein: The inlet is arranged and configured upstream of the first gap, and The outlet is arranged and configured downstream of the first reverse channel.

11. The cooler according to claim 1, wherein: The first unit or the second unit is a fin-shaped member made of a material including aluminum.

12. The cooler according to claim 2, wherein: The first unit first root portion is configured to cause the first coolant inlet flow to be split into two partial flows, The two partial flows enter the two adjacent first reverse channels.

13. The cooler according to claim 1, wherein: The first root of the first unit is on one side of the heat-conducting cooler wall. The first plane is the opposite side of the heat-conducting cooler wall.

14. The cooler according to claim 1, wherein: The first unit and the second unit are configured to form a housing.

15. The cooler according to claim 4, wherein: The first unit and the third unit are configured to form a housing. Specifically, the second unit is configured to form the housing in combination with the first unit and the third unit.

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