Liquid-cooled heat sink

Abstract

To provide a liquid-cooled heat sink capable of being installed in a narrow space by surely bringing a heating element into thermal contact with the liquid-cooled heat sink even if a pressing load is not more than 36 Newton when the heating element is mounted on a cage.SOLUTION: The liquid-cooled heat sink 1 includes a cold plate 10 which is thermally connected to a heat generating body and forms a heat medium circulation space or a heat medium circulation part in which a liquid-phase heat medium flows, and releases the heat of the heat generating body to the heat medium, a first pipe 20 which is connected to a heat medium inflow part 11 formed in the cold plate 10 and has one end 21 integrated therewith, a second pipe 30 which is connected to a heat medium outflow part formed in the cold plate 10 and has one end 32 integrated therewith, a first manifold 40 which is connected to the other end 22 of the first pipe 20 and supplies the integrated heat medium to the first pipe 20, and a second manifold 50 which is connected to the other end 33 of the second pipe 30 and receives the integrated heat medium from the second pipe 30.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a liquid-cooled heat sink for cooling objects (heat generating bodies) such as electrical and electronic components, and in particular to a liquid-cooled heat sink that can be connected to a cage that allows the heat generating body to be attached and detached. [Background technology]

[0002] As electronic devices become more sophisticated, the amount of heat generated by the electrical and electronic components and other heat-generating elements installed in those devices increases. If the temperature of the electrical and electronic components rises above a specified allowable temperature, it can cause the electrical and electronic components to malfunction, so it is important to keep the temperature of the electrical and electronic components below the allowable temperature.

[0003] In particular, in recent years, as the amount of heat generated by heat-generating elements such as electrical and electronic components has been increasing, it may be difficult to maintain the temperature of the heat-generating element below an allowable temperature using an air-cooled heat sink, and it may be necessary to cool the heat-generating element using a liquid-cooled heat sink.

[0004] As a liquid-cooled heat sink, one that cools an electronic card has been proposed (Patent Document 1), which has a cold block that is connected to the cold plate and has an internal space that is connected to the cold plate, and a tube connected to the cold block through which a liquid-phase heat exchange medium flows.

[0005] Another liquid-cooled heat sink proposed is a heat sink having a cold plate configured to use separated primary and secondary liquid coolants, the cold plate defining an internal volume, a thermal conductor attached to an electronic device and configured to transfer heat from the electronic device to the internal volume, a coolant inlet for receiving the secondary liquid coolant into the internal volume to receive the transferred heat, and a coolant outlet for the secondary liquid coolant to flow out of the internal volume, the thermal conductor further configured to define an external receptacle having a volume configured to receive and hold the primary liquid coolant for heat transfer between the primary liquid coolant and the secondary liquid coolant (Patent Document 2).

[0006] Optical connectors, on the other hand, are used in data centers for transmitting and receiving data in servers and network switches. They have an optoelectronic conversion function that converts data received as an optical signal into an electrical signal, and vice versa. Optical connectors generate heat according to their data processing capacity, and as data volumes increase, cooling using a liquid-cooled heat sink is required. Optical connectors are attached and detached using a metal cage attached to the device, and a liquid-cooled heat sink is attached to the top of the cage to cool the optical connector. Optical connectors must be detachable from the exterior of the device, and when attaching the optical connector to the cage, reliable thermal contact between the optical connector and the liquid-cooled heat sink must be achieved. Furthermore, as the performance of devices increases, the internal density increases, resulting in a smaller installation space for liquid-cooled heat sinks.

[0007] When an optical connector is inserted into a cage, the optical connector comes into contact with an elastic body, such as a leaf spring, attached to the cage, generating stress in the elastic body toward the heat sink, thermally connecting the optical connector and the heat sink. Since the load-bearing capacity of an optical connector is set at 36 Newtons, the pressing load of the liquid-cooled heat sink must be 36 Newtons or less. However, liquid-cooled heat sinks such as those described in Patent Documents 1 and 2 require the use of rubber hoses or metal tubes with high pressure resistance to prevent liquid leakage, and a pressing load of 36 Newtons or less is insufficient to reliably thermally connect the liquid-cooled heat sink to the optical connector.

[0008] Furthermore, if a rubber hose with high pressure resistance is used as piping, the pipe diameter increases and the rubber hose must be fastened with clips, which creates the problem that it cannot be used for liquid-cooled heat pipes installed in small spaces. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] US Patent Application Publication No. 2024 / 0074101 [Patent Document 2] US Patent Application Publication No. 2022 / 0418156 Summary of the Invention [Problem to be solved by the invention]

[0010] In view of the above circumstances, the present invention aims to provide a liquid-cooled heat sink that can be installed in a small space and can ensure thermal contact between the heat generating element and the liquid-cooled heat sink even when the pressing load of the liquid-cooled heat sink is 36 Newtons or less when the heat generating element is attached to the cage. [Means for solving the problem]

[0011] The liquid-cooled heat sink of the present invention has the following configuration. [1] A liquid-cooled heat sink connected to a cage that allows the heating element to be removed. a cold plate that is thermally connected to the heat generating element, has a heat medium flow space formed therein through which a heat medium in a liquid phase flows, and releases heat absorbed from the heat generating element to the heat medium flowing in the heat medium flow space; or a cold plate that is thermally connected to the heat generating element, has a heat medium flow section formed on a solid plate-like member through which a heat medium in a liquid phase flows, and releases heat absorbed from the heat generating element to the heat medium flowing in the heat medium flow section; a first pipe having one end connected to a heat medium inlet portion formed in the cold plate; a second pipe having one end connected to a heat medium outlet portion formed in the cold plate; a first manifold connected to the other end of the first pipe and supplying the heat medium to the first pipe; a second manifold connected to the other end of the second pipe and receiving the heat medium from the second pipe; and one end of the first pipe is integrated with the heat medium inlet portion of the cold plate, and one end of the second pipe is integrated with the heat medium outlet portion of the cold plate; The other end of the first pipe is integrated with the first manifold, and the other end of the second pipe is integrated with the second manifold. [2] The liquid-cooled heat sink according to [1], wherein the Vickers hardness of the first pipe and the second pipe is 30 HV or more and 40 HV or less. [3] A liquid-cooled heat sink according to [1] or [2], wherein a plurality of the cold plates are arranged in parallel. [4] The liquid-cooled heat sink according to [1] or [2], wherein the first pipe and the second pipe have portions at the same height relative to the cold plate. [5] The cold plate is a base plate having a heat receiving surface provided on one surface thereof and thermally connected to the heat generating element, and a heat transfer portion provided protruding from the heat receiving surface and through which heat from the heat receiving surface is transferred; a cover plate that covers the heat transfer portion and forms another surface opposite to the one surface, the cover plate having the heat medium inlet portion and the heat medium outlet portion provided therein; The heat transfer medium circulation space is formed between the heat receiving surface of the base plate and the cover plate, and heat is released from the heat receiving surface and the heat transfer section to the heat transfer medium circulating in the heat transfer medium circulation space. [6] The liquid-cooled heat sink according to [5], wherein each of the plurality of heat transfer portions is a fin extending along the flow direction of the heat medium flowing through the heat medium flow space. [7] The liquid-cooled heat sink according to [1] or [2], wherein at least a partial area of ​​the first pipe and the second pipe is flattened. [8] The liquid-cooled heat sink according to [1] or [2], wherein the heat transfer medium flow portion of the cold plate is a flattened tubular portion. [9] The cold plate is divided into a plurality of cold plate sections, each of which includes a first cold plate section and a second cold plate section; one end of the first pipe is connected to the first cold plate portion, and one end of the second pipe is connected to the second cold plate portion; The liquid-cooled heat sink according to [1] or [2], wherein the first cold plate portion is connected to one end of a third pipe, and the second cold plate portion is connected to the other end of the third pipe.

[10] A liquid-cooled heat sink according to [1] or [2], wherein the cross-sectional area of ​​the internal space in the width direction of the first manifold is larger than the cross-sectional area of ​​the internal space in the width direction of the second manifold.

[11] The liquid-cooled heat sink according to [1] or [2], wherein the first pipe and / or the second pipe is a corrugated pipe.

[12] The liquid-cooled heat sink according to [1] or [2], wherein the first pipe and the second pipe are copper pipes.

[13] A liquid-cooled heat sink according to [1] or [2], wherein the diameter of the internal space of the first pipe is 2 mm or more and 4 mm or less, and the diameter of the internal space of the second pipe is 2 mm or more and 4 mm or less.

[14] The liquid-cooled heat sink according to [1] or [2], wherein the length of the first pipe is 50 mm or more, and the length of the second pipe is 50 mm or more.

[15] The liquid-cooled heat sink according to [1] or [2], wherein the heat generating element is an optical connector. [Effects of the Invention]

[0012] According to an aspect of the liquid-cooled heat sink of the present invention, there is provided a cold plate that is thermally connected to the heat generating element, has a heat medium flow space formed therein through which a heat medium in a liquid phase flows, and releases heat absorbed from the heat generating element to the heat medium flowing in the heat medium flow space, or a cold plate that is thermally connected to the heat generating element, has a heat medium flow section formed on a solid plate member through which a heat medium in a liquid phase flows, and releases heat absorbed from the heat generating element to the heat medium flowing in the heat medium flow section, a first pipe having one end connected to a heat medium inlet section formed in the cold plate, and a second pipe having one end connected to a heat medium outlet section formed in the cold plate. a first manifold connected to the other end of the first pipe for supplying the heat transfer medium to the first pipe, and a second manifold connected to the other end of the second pipe for receiving the heat transfer medium from the second pipe, wherein one end of the first pipe is integrated with the heat transfer medium inlet port of the cold plate, one end of the second pipe is integrated with the heat transfer medium outlet port of the cold plate, the other end of the first pipe is integrated with the first manifold, and the other end of the second pipe is integrated with the second manifold, thereby enabling the ends of each pipe to be connected to each component in a space-saving manner with high pressure resistance, and allowing installation in a narrow space. Furthermore, even if the diameter of the pipes is increased to ensure reliable thermal contact between the heat generating element and the liquid-cooled heat sink even when the pressing load of the liquid-cooled heat sink is 36 Newtons or less, the liquid-cooled heat sink can be installed in a narrow space.

[0013] Furthermore, according to an embodiment of the liquid-cooled heat sink of the present invention, the Vickers hardness of the first pipe and the second pipe is 30HV or more and 40HV or less, so that the first pipe and the second pipe have appropriate flexibility. Therefore, when the heat generating element is attached to the cage, the first pipe and the second pipe deform appropriately in accordance with the stress of the elastic body in the direction of the heat sink. As a result, even if the pressing load of the liquid-cooled heat sink is 36 Newtons or less, thermal contact between the heat generating element and the liquid-cooled heat sink can be ensured reliably. Even if multiple heat generating elements are mounted in parallel in one cage, when the heat generating element is attached to the cage, the stress during attachment can be prevented from affecting the contact state between the liquid-cooled heat sink and other adjacent heat generating elements through piping or the like.

[0014] Furthermore, according to an embodiment of the liquid-cooled heat sink of the present invention, the first pipe and the second pipe have portions at the same height relative to the cold plate, which facilitates deformation of the first pipe and the second pipe when attaching the heat generating element to the cage, making it possible to further facilitate thermal contact between the heat generating element and the liquid-cooled heat sink even when the pressing load of the liquid-cooled heat sink is 36 Newtons or less, and furthermore, when the heat generating element is attached to the cage, it is possible to more reliably prevent stress during attachment from affecting the contact state between other adjacent heat generating elements and the liquid-cooled heat sink through piping or the like.

[0015] Furthermore, according to an embodiment of the liquid-cooled heat sink of the present invention, at least a portion of the first pipe and the second pipe are flattened, thereby making the liquid-cooled heat sink more compact and making it easier to install in a small space.

[0016] Furthermore, according to an aspect of the liquid-cooled heat sink of the present invention, the heat transfer medium flow portion of the cold plate is a flattened tubular portion, which further improves the heat dissipation characteristics of the cold plate to the heat transfer medium.

[0017] Furthermore, according to an aspect of the liquid-cooled heat sink of the present invention, the cold plate is divided into a plurality of cold plate portions having a first cold plate portion and a second cold plate portion, one end of the first pipe is connected to the first cold plate portion, one end of the second pipe is connected to the second cold plate portion, the first cold plate portion is connected to one end of a third pipe, and the second cold plate portion is connected to the other end of the third pipe. This facilitates deformation of the pipes of the liquid-cooled heat sink, further facilitating thermal contact between the heat generating element and the liquid-cooled heat sink even when the pressing load of the liquid-cooled heat sink is 36 Newtons or less, and furthermore, when the heat generating element is attached to the cage, it is possible to more reliably prevent stress during attachment from affecting the contact state between the heat generating element and the liquid-cooled heat sink of other adjacent heat generating elements through pipes or the like.

[0018] Furthermore, according to an aspect of the liquid-cooled heat sink of the present invention, the cross-sectional area of ​​the internal space in the width direction of the first manifold is larger than the cross-sectional area of ​​the internal space in the width direction of the second manifold, thereby equalizing the flow of heat medium into multiple cold plates.

[0019] Furthermore, according to an aspect of the liquid-cooled heat sink of the present invention, since the first pipe and the second pipe are copper pipes, the diameters of the first pipe and the second pipe can be reduced, and the pressure resistance of the first pipe and the second pipe is improved.

[0020] Furthermore, according to an embodiment of the liquid-cooled heat sink of the present invention, the length of the first pipe is 50 mm or more, and the length of the second pipe is 50 mm or more, thereby preventing work hardening of the first pipe and the second pipe caused by multiple attachment and detachment of the heating element. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a perspective view of a liquid-cooled heat sink according to a first embodiment of the present invention; [Figure 2] 1 is a side view of a liquid-cooled heat sink according to a first embodiment of the present invention. [Figure 3] 1 is a perspective view of a cold plate, a first pipe, and a second pipe of a liquid-cooled heat sink according to a first embodiment of the present invention; [Figure 4] 1 is an explanatory diagram of the internal structure of a cold plate of a liquid-cooled heat sink according to a first embodiment of the present invention. [Figure 5] 1 is a perspective view of a cold plate of a liquid-cooled heat sink according to a first embodiment of the present invention; [Figure 6] 1 is a perspective view of a cage with a pedestal mounted thereon to which a liquid-cooled heat sink according to a first embodiment of the present invention is attached. FIG. [Figure 7] 1 is an explanatory diagram of a cage to which a liquid-cooled heat sink according to a first embodiment of the present invention is attached. FIG. [Figure 8] 1 is an explanatory diagram of a pedestal to which a liquid-cooled heat sink according to a first embodiment of the present invention is attached. FIG. [Figure 9] 1 is a perspective view of a liquid-cooled heat sink according to a first embodiment of the present invention attached to a cage. [Figure 10] FIG. 10 is a perspective view of a plurality of liquid-cooled heat sinks according to a second embodiment of the present invention arranged in parallel. [Figure 11] FIG. 10 is a perspective view of a plurality of liquid-cooled heat sinks according to a third embodiment of the present invention arranged in series. [Figure 12] FIG. 10 is a perspective view of a plurality of liquid-cooling heat sinks according to a fourth embodiment of the present invention arranged in parallel. [Figure 13] FIG. 10 is a perspective view of a plurality of liquid-cooling heat sinks according to a fifth embodiment of the present invention arranged in parallel. [Figure 14] FIG. 10 is a perspective view of a plurality of liquid-cooling heat sinks according to a sixth embodiment of the present invention arranged in parallel. DETAILED DESCRIPTION OF THE INVENTION

[0022] The liquid-cooled heat sink of the present invention will be described below. First, a liquid-cooled heat sink according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the liquid-cooled heat sink according to the first embodiment of the present invention. FIG. 2 is a perspective view of the liquid-cooled heat sink according to the first embodiment of the present invention. FIG. 3 is a perspective view of the cold plate, first piping, and second piping of the liquid-cooled heat sink according to the first embodiment of the present invention. FIG. 4 is an explanatory diagram of the internal structure of the cold plate of the liquid-cooled heat sink according to the first embodiment of the present invention. FIG. 5 is a perspective view of the cold plate of the liquid-cooled heat sink according to the first embodiment of the present invention.

[0023] The liquid-cooled heat sink of the present invention is a liquid-cooled heat sink that is connected to a cage that allows a heat generating element to be attached and detached.

[0024] As shown in Figures 1 to 3, a liquid-cooled heat sink 1 according to a first embodiment of the present invention includes a cold plate 10 thermally connected to a heat generating element (not shown), a first pipe 20 having one end 21 connected to a heat medium inlet 11 formed on the cold plate 10, a second pipe 30 having one end 31 connected to a heat medium outlet 12 formed on the cold plate 10, a first manifold 40 connected to the other end 22 of the first pipe 20 for supplying a heat medium (not shown) to the first pipe 20, and a second manifold 50 connected to the other end 32 of the second pipe 30 for receiving the heat medium from the second pipe 30.

[0025] The heat medium is supplied from the first manifold 40 to the cold plate 10 via the first piping 20, and heat absorbed by the cold plate 10 from the heat-generating element is released into the heat medium while the heat medium flows through the cold plate 10, thereby cooling the heat-generating element, which is the object to be cooled. The heat medium that has absorbed heat from the cold plate 10 is discharged from the cold plate 10 to the second manifold 50 via the second piping 30. The heat medium discharged to the second manifold 50 is cooled in a heat exchanger (not shown) and then flows into the first manifold 40 again.

[0026] One end 21 of the first pipe 20 is integrated with the heat transfer medium inlet portion 11 of the cold plate 10, and one end 31 of the second pipe 30 is integrated with the heat transfer medium outlet portion 12 of the cold plate 10. Therefore, one end 21 of the first pipe 20 is connected to the cold plate 10 without using a fastening member, and one end 31 of the second pipe 30 is connected to the cold plate 10 without using a fastening member. Examples of means for integrating one end 21 of the first pipe 20 with the heat transfer medium inlet portion 11 of the cold plate 10 and means for integrating one end 31 of the second pipe 30 with the heat transfer medium outlet portion 12 of the cold plate 10 include brazing, welding, soldering, etc.

[0027] Furthermore, in the liquid-cooled heat sink 1, the other end 22 of the first pipe 20 is integrated with the first manifold 40, and the other end 32 of the second pipe 30 is integrated with the second manifold 50. Therefore, the other end 22 of the first pipe 20 is connected to the first manifold 40 without using a fastening member, and the other end 32 of the second pipe 30 is connected to the second manifold 50 without using a fastening member. Examples of means for integrating the other end 22 of the first pipe 20 with the first manifold 40 and means for integrating the other end 32 of the second pipe 30 with the second manifold 50 include brazing, welding, soldering, etc.

[0028] In the liquid-cooled heat sink 1, a plurality of heat generating elements are stored in parallel in a detachable cage, and thus a plurality of cold plates 10, 10, 10... are arranged in parallel. In other words, a plurality of heat generating elements are stored in parallel in a detachable cage, and thus a plurality of liquid-cooled heat sinks 1, 1, 1... are arranged in parallel.

[0029] 2, in the liquid-cooled heat sink 1, the first pipe 20 and the second pipe 30 each have portions 23 and 33 at the same height relative to the cold plate 10. In the liquid-cooled heat sink 1, the region located between one end 21 and the other end 22 of the first pipe 20 and extending along the surface of the cold plate 10 is portion 23, and the region located between one end 31 and the other end 32 of the second pipe 30 and extending along the surface of the cold plate 10 is portion 33.

[0030] The portion 23 of the first pipe 20 extends substantially parallel to the portion 33 of the second pipe 30. The first pipe 20 and the second pipe 30 are brought into close proximity at least in the regions of the portions 23 and 33.

[0031] In the liquid-cooled heat sink 1, the Vickers hardness of the first pipe 20 and the second pipe 30 is not particularly limited, but is preferably adjusted to 30 HV or more and 40 HV or less. If the Vickers hardness of the first pipe 20 and the second pipe 30 is adjusted to 30 HV or more and 40 HV or less, the first pipe 20 and the second pipe 30 can have pressure resistance and appropriate flexibility.

[0032] As a method for adjusting the Vickers hardness of the first pipe 20 and the second pipe 30 to 30 HV or more and 40 HV or less, for example, a method of annealing the first pipe 20 and the second pipe 30 at 700°C to 800°C can be mentioned.

[0033] The first pipe 20 and the second pipe 30 may be made of a metal pipe such as a copper pipe, for example.

[0034] The diameter of the internal space of the first pipe 20 is not particularly limited, but is preferably 2 mm to 4 mm, and more preferably 2 mm to 3 mm, from the viewpoint of reducing the pressure loss of the heat medium flowing through the first pipe 20 while miniaturizing the liquid-cooled heat sink 1. The diameter of the internal space of the second pipe 30 is not particularly limited, but is preferably 2 mm to 4 mm, and more preferably 2 mm to 3 mm, from the viewpoint of reducing the pressure loss of the heat medium flowing through the second pipe 30 while miniaturizing the liquid-cooled heat sink 1.

[0035] The length of the first pipe 20 is not particularly limited, but is preferably 50 mm or more, and particularly preferably 60 mm or more, from the viewpoint of preventing work hardening due to plastic deformation of the first pipe 20. The length of the second pipe 30 is not particularly limited, but is preferably 50 mm or more, and particularly preferably 60 mm or more, from the viewpoint of preventing work hardening due to plastic deformation of the second pipe 30.

[0036] A pipe with a smooth wall surface or a corrugated pipe may be used for the first pipe 20 and / or the second pipe 30. The radial shapes of the first pipe 20 and the second pipe 30 are not particularly limited, and in the liquid-cooled heat sink 1, both the first pipe 20 and the second pipe 30 are round pipes with a round shape in the radial direction.

[0037] As shown in FIG. 4, in the liquid-cooled heat sink 1, a heat medium flow space 13 is formed in the cold plate 10, through which a liquid-phase heat medium (not shown) flows, and the cold plate 10 has the function of releasing heat absorbed from a heat generating element (not shown) to the heat medium flowing through the heat medium flow space 13.

[0038] 4 and 5, the cold plate 10 includes a base plate 16 having a heat-receiving surface 14 provided on one side thereof and thermally connected to a heat-generating element, and a heat transfer section 15 provided protruding from the heat-receiving surface 14 and through which heat from the heat-receiving surface 14 is transferred, and a cover plate 17 forming the other side opposite the heat-receiving surface 14 and covering the heat transfer section 15, which is provided with a heat medium inlet section 11 and a heat medium outlet section 12. A heat medium flow space 13 is formed between the heat-receiving surface 14 of the base plate 16 and the cover plate 17, and the heat is released from the heat-receiving surface 14 and the heat transfer section 15 to the heat medium flowing through the heat medium flow space 13, thereby cooling the heat-generating element.

[0039] A heating element is thermally connected to the outer surface of the heat receiving surface 14. The heat transfer section 15 of the base plate 16 is a section that protrudes from the inner surface of the heat receiving surface 14 of the base plate 16 toward the cover plate 17. The heat transfer section 15 of the base plate 16 is integrally formed with the inner surface of the heat receiving surface 14 of the base plate 16. A plurality of heat transfer sections 15 are provided, and they also function as flow paths through which the heat medium flows.

[0040] In the liquid-cooled heat sink 1, the plurality of heat transfer portions 15, 15, 15 . . . are fins that extend along the flow direction of the heat medium that flows through the heat medium flow space 13.

[0041] The heat medium inlet portion 11 and the heat medium outlet portion 12 are each a through hole provided in the cover plate 17 .

[0042] The cold plate 10 may be made of a metal such as copper.

[0043] The size relationship between the first manifold 40 and the second manifold 50 is not particularly limited, but in the liquid-cooled heat sink 1, the cross-sectional area of ​​the internal space in the width direction of the first manifold 40 is larger than the cross-sectional area of ​​the internal space in the width direction of the second manifold 50. Alternatively, the cross-sectional area of ​​the internal space in the width direction of the first manifold 40 may be the same as the cross-sectional area of ​​the internal space in the width direction of the second manifold 50, or the cross-sectional area of ​​the internal space in the width direction of the second manifold 50 may be larger than the cross-sectional area of ​​the internal space in the width direction of the first manifold 40.

[0044] The first manifold 40 and the second manifold 50 may be made of a metal such as copper.

[0045] Examples of the heat generating element thermally connected to the cold plate 10 include optical connectors used for transmitting and receiving data in servers and network switches used in data centers, etc. Examples of the heat transfer medium include water.

[0046] Next, an example of how to use the liquid-cooled heat sink 1 will be described. Fig. 6 is a perspective view of a cage with a pedestal mounted thereon to which the liquid-cooled heat sink according to the first embodiment of the present invention is attached. Fig. 7 is an explanatory diagram of a cage with a liquid-cooled heat sink according to the first embodiment of the present invention attached. Fig. 8 is an explanatory diagram of a pedestal with a liquid-cooled heat sink according to the first embodiment of the present invention attached. Fig. 9 is a perspective view of a cage with a liquid-cooled heat sink according to the first embodiment of the present invention attached.

[0047] 9, a cage 100 has a plurality of heat generating element storage sections 101 arranged in parallel for storing heat generating elements (not shown). A plurality of heat generating elements are stored in parallel in the respective heat generating element storage sections 101, and a liquid-cooled heat sink 1 is attached to the top surface of the cage 100, to which the heat generating elements can be attached and detached. As a plurality of heat generating elements are stored in parallel in the heat generating element storage sections 101 of the cage 100, to which the heat generating elements can be attached and detached, a plurality of cold plates 10, 10, 10... are arranged in parallel. In other words, as a plurality of heat generating elements are stored in parallel in the heat generating element storage sections 101 of the cage 100, to which the heat generating elements can be attached and detached, a plurality of liquid-cooled heat sinks 1, 1, 1... are arranged in parallel.

[0048] 6 and 7, pedestals 200 are provided on the upper surface of cage 100. A pedestal 200 is provided for each heat generating element storage section 101. That is, since a plurality of heat generating elements (not shown) are stored in parallel in heat generating element storage section 101 of cage 100, to which the heat generating elements can be attached and detached, a plurality of pedestals 200, 200, 200... are arranged in parallel.

[0049] The upper surface of the cage 100 is provided with a hole 103 for placing the pedestal 200 on the upper surface of the cage 100 .

[0050] As shown in Figure 8, the underside of the pedestal 200 is provided with a protrusion 201 that corresponds to the shape of the hole 103. When the pedestal 200 is attached to the hole 103 of the cage 100, the protrusion 201 of the pedestal 200 is exposed to the heat-generating element housing 101. In this embodiment, since the pedestal 200 is provided separately from the cage 100, when assembling the liquid-cooled heat sink 1, all of the cold plates 10 are installed face-to-face, and final fastening by screwing or the like can be performed while adjusting their in-plane positions, making the assembly process easier. In contrast, if the pedestal and the cage are manufactured as a single unit, the heat sink and the cage must be assembled by engaging the protrusions of multiple movable cold plates with the holes in the cage.

[0051] 6, an elastic body 102 such as a leaf spring is provided between the cage 100 and the pedestal 200. The elastic body 102 thermally connects the heat generating element inserted into the heat generating element housing portion 101 to the liquid-cooled heat sink 1 when the heat generating element contacts the liquid-cooled heat sink 1. When the heat generating element is inserted into the heat generating element housing portion 101, the inserted heat generating element generates stress in the elastic body 102 in the direction of the liquid-cooled heat sink 1, displacing the pedestal 200 toward the liquid-cooled heat sink 1 and coming into close contact with the cold plate 10 of the liquid-cooled heat sink 1. As a result, the heat generating element inserted into the heat generating element housing portion 101 is thermally connected to the liquid-cooled heat sink 1 via the pedestal 200.

[0052] As the pedestal 200 is displaced toward the liquid-cooled heat sink 1, the cold plate 10 of the liquid-cooled heat sink 1 is also displaced away from the upper surface of the cage 100. The pedestal 200 may be made of a metal such as copper.

[0053] According to an embodiment of the liquid-cooled heat sink 1, the liquid-cooled heat sink 1 includes a cold plate 10 that is thermally connected to a heat generating element, has a heat medium flow space 13 formed therein through which a heat medium in a liquid phase flows, and releases heat absorbed from the heat generating element to the heat medium flowing through the heat medium flow space 13, a first pipe 20 having one end 21 connected to a heat medium inlet portion 11 formed on the cold plate 10, a second pipe 30 having one end 31 connected to a heat medium outlet portion 12 formed on the cold plate 10, a first manifold 40 connected to the other end 22 of the first pipe 20 and supplying the heat medium to the first pipe 20, and a second manifold 50 connected to the other end 32 of the second pipe 30 and receiving the heat medium from the second pipe 30, and the first pipe 20 and the second pipe 30 are connected to each other. Since the Kerr hardness is 30HV or more and 40HV or less, the first piping 20 and the second piping 30 have appropriate flexibility, so that when the heating element is attached to the cage 100, the first piping 20 and the second piping 30 deform appropriately in accordance with the stress of the elastic body 102 in the direction of the liquid-cooled heat sink 1. As a result, even if the pressing load of the liquid-cooled heat sink 1 is 36 Newtons or less, thermal contact between the heating element and the liquid-cooled heat sink 1 can be ensured. Even if multiple heating elements are mounted in parallel in one cage 100, when the heating elements are attached to the cage 100, the stress at the time of attachment can be prevented from affecting the contact state of other adjacent heating elements with the liquid-cooled heat sink 1 through the first piping 20 and the second piping 30, etc.

[0054] According to the aspect of the liquid-cooled heat sink 1, one end 21 of the first pipe 20 is integrated with the heat transfer medium inlet section 11 of the cold plate 10, one end 31 of the second pipe 30 is integrated with the heat transfer medium outlet section 12 of the cold plate 10, the other end 22 of the first pipe 20 is integrated with the first manifold 40, and the other end 32 of the second pipe 30 is integrated with the second manifold 50, so that the heat sink can be installed even in a small space.

[0055] Furthermore, according to the aspect of the liquid-cooled heat sink 1, the first pipe 20 and the second pipe 30 have portions at the same height relative to the cold plate 10, which facilitates deformation of the first pipe 20 and the second pipe 30 when attaching the heat generating element to the cage 100, making it possible to further facilitate thermal contact between the heat generating element and the liquid-cooled heat sink 1 even when the pressing load of the liquid-cooled heat sink 1 is 36 Newtons or less, and furthermore, when the heat generating element is attached to the cage 100, it is possible to more reliably prevent the stress generated during attachment from affecting the contact state between the heat generating element and the liquid-cooled heat sink 1 of other adjacent heat generating elements through the first pipe 20, the second pipe 30, etc.

[0056] Furthermore, according to the embodiment of the liquid-cooled heat sink 1, the cross-sectional area of ​​the internal space in the width direction of the first manifold 40 is larger than the cross-sectional area of ​​the internal space in the width direction of the second manifold 50, so that the flow of heat medium into the multiple cold plates 10, 10, 10... is equalized.

[0057] Furthermore, according to the embodiment of the liquid-cooled heat sink 1, since the first pipe 20 and the second pipe 30 are copper pipes, the diameters of the first pipe 20 and the second pipe 30 can be reduced, and the pressure resistance of the first pipe 20 and the second pipe 30 is improved.

[0058] Furthermore, according to the embodiment of the liquid-cooled heat sink 1, the length of the first pipe 20 is 50 mm or more, and the length of the second pipe 30 is 50 mm or more, so that work hardening of the first pipe 20 and the second pipe 30 caused by multiple attachment and detachment of the heat generating element to the cage 100 is prevented.

[0059] Next, a liquid-cooled heat sink according to a second embodiment of the present invention will be described with reference to the drawings. The liquid-cooled heat sink according to the second embodiment shares major components with the liquid-cooled heat sink according to the first embodiment, so the same components as those in the liquid-cooled heat sink according to the first embodiment will be described using the same reference numerals. Note that Fig. 10 is a perspective view of multiple liquid-cooled heat sinks according to the second embodiment of the present invention arranged in parallel.

[0060] In the liquid-cooled heat sink 1 according to the first embodiment, the first pipe 20 and the second pipe 30 have portions at the same height as the cold plate 10 in the region extending along the surface of the cold plate 10. However, in the liquid-cooled heat sink 2 according to the second embodiment, as shown in FIG. 10, the first pipe 20 and the second pipe 30 do not have portions at the same height as the cold plate 10 in the region extending along the surface of the cold plate 10.

[0061] In the liquid-cooled heat sink 2, in the region extending along the surface direction of the cold plate 10, the first pipe 20 is positioned lower relative to the cold plate 10 than the second pipe 30. In this way, in the liquid-cooled heat sink of the present invention, the relationship between the height of the first pipe 20 and the height of the second pipe 30 relative to the cold plate 10 can be selected appropriately depending on the conditions of use, etc.

[0062] The liquid-cooled heat sink 2 also includes a cold plate 10 that is thermally connected to a heat generating element, has a heat medium flow space 13 formed therein through which a heat medium in a liquid phase flows, and releases heat absorbed from the heat generating element to the heat medium flowing through the heat medium flow space 13, a first pipe 20 having one end 21 connected to a heat medium inlet portion 11 formed in the cold plate 10, a second pipe 30 having one end 31 connected to a heat medium outlet portion 12 formed in the cold plate 10, a first manifold 40 connected to the other end 22 of the first pipe 20 and supplying the heat medium to the first pipe 20, and a second manifold 50 connected to the other end 32 of the second pipe 30 and receiving the heat medium from the second pipe 30, and a joint between the first pipe 20 and the second pipe 30. Since the Cars hardness is 30HV or more and 40HV or less, the first pipe 20 and the second pipe 30 have appropriate flexibility, so that when the heating element is attached to the cage 100, the first pipe 20 and the second pipe 30 deform appropriately in accordance with the stress of the elastic body 102 in the direction of the liquid-cooled heat sink 2. As a result, even if the pressing load of the liquid-cooled heat sink 2 is 36 Newtons or less, thermal contact between the heating element and the liquid-cooled heat sink 2 can be ensured. Even if multiple heating elements are mounted in parallel in one cage 100, when the heating elements are attached to the cage 100, the stress at the time of attachment can be prevented from affecting the contact state of other adjacent heating elements with the liquid-cooled heat sink 2 through the first pipe 20 and the second pipe 30, etc.

[0063] Next, a liquid-cooled heat sink according to a third embodiment of the present invention will be described with reference to the drawings. The liquid-cooled heat sink according to the third embodiment shares major components with the liquid-cooled heat sinks according to the first and second embodiments, so the same components as those in the liquid-cooled heat sinks according to the first and second embodiments will be described using the same reference numerals. Note that Fig. 11 is a perspective view of multiple liquid-cooled heat sinks according to the third embodiment of the present invention arranged in series.

[0064] In the liquid-cooled heat sinks 1 and 2 according to the first and second embodiments, each of the multiple cold plates 10, 10, 10... is connected to a first pipe 20 connected to a first manifold 40, and a second pipe 30 connected to a second manifold 50. 11 , in the liquid-cooled heat sink 3 according to the third embodiment, the cold plates 10, 10, 10... are arranged in parallel in terms of the flow of the heat medium, but instead, as shown in FIG. 11 , the cold plate 10 located at the most upstream position in the heat medium flow among the cold plates 10, 10, 10... is connected to the first piping 20 connected to the first manifold 40, but is not connected to the second piping 30 connected to the second manifold 50, and the cold plate 10 located at the most downstream position in the heat medium flow is connected to the second piping 30 connected to the second manifold 50, but is not connected to the first piping 20 connected to the first manifold 40. That is, in the liquid-cooled heat sink 3, the cold plates 10, 10, 10... are arranged in series in terms of the flow of the heat medium.

[0065] In the liquid-cooled heat sink 3, adjacent cold plates 10 are connected by relay pipes 24, which connect the heat medium outlet 12 of one cold plate 10 located upstream of the heat medium to the heat medium inlet 11 of another adjacent cold plate 10 located downstream of the heat medium.

[0066] In the liquid-cooled heat sink 3, like the first pipe 20 and the second pipe 30, the relay pipe 24 is also adjusted to have a Vickers hardness of 30 HV or more and 40 HV or less.

[0067] The liquid-cooled heat sink 3 also includes a cold plate 10 that is thermally connected to a heat generating element, has a heat medium flow space 13 formed therein through which a heat medium in a liquid phase flows, and releases heat absorbed from the heat generating element to the heat medium flowing through the heat medium flow space 13, a first pipe 20 having one end 21 connected to a heat medium inlet portion 11 formed in the cold plate 10, a second pipe 30 having one end 31 connected to a heat medium outlet portion 12 formed in the cold plate 10, a first manifold 40 connected to the other end 22 of the first pipe 20 and supplying the heat medium to the first pipe 20, and a second manifold 50 connected to the other end 32 of the second pipe 30 and receiving the heat medium from the second pipe 30, and a joint between the first pipe 20 and the second pipe 30. Since the Cars hardness is 30HV or more and 40HV or less, the first pipe 20 and the second pipe 30 have appropriate flexibility, so that when the heating element is attached to the cage 100, the first pipe 20 and the second pipe 30 deform appropriately in accordance with the stress of the elastic body 102 in the direction of the liquid-cooled heat sink 3. As a result, even if the pressing load of the liquid-cooled heat sink 3 is 36 Newtons or less, thermal contact between the heating element and the liquid-cooled heat sink 3 can be ensured. Even if multiple heating elements are mounted in parallel in one cage 100, when the heating elements are attached to the cage 100, the stress at the time of attachment can be prevented from affecting the contact state between other adjacent heating elements and the liquid-cooled heat sink 3 through the first pipe 20 and the second pipe 30, etc.

[0068] Next, a liquid-cooled heat sink according to a fourth embodiment of the present invention will be described with reference to the drawings. The liquid-cooled heat sink according to the fourth embodiment has major components in common with the liquid-cooled heat sinks according to the first to third embodiments, and therefore the same components as those in the liquid-cooled heat sinks according to the first to third embodiments will be described using the same reference numerals. Note that Fig. 12 is a perspective view of a plurality of liquid-cooled heat sinks according to the fourth embodiment of the present invention arranged in parallel.

[0069] The liquid-cooled heat sinks 1 and 2 according to the first and second embodiments have a heat medium flow space 13 formed therein through which a heat medium in liquid phase flows, and have a cold plate 10 that releases heat absorbed from a heat-generating element to the heat medium flowing through the heat medium flow space 13. However, as shown in FIG. 12 , the liquid-cooled heat sink 4 according to the fourth embodiment has a heat medium flow section 61 formed on a solid plate-like member 60, through which a heat medium in liquid phase flows, and has a cold plate 10 that releases heat absorbed from a heat-generating element to the heat medium flowing through the heat medium flow section 61.

[0070] In the liquid-cooled heat sink 4, a heat medium flow section 61 is thermally connected to the other surface 62 of the plate-shaped member 60, which faces the heat-receiving surface 14 that is thermally connected to the heat-generating element provided on one surface.

[0071] In the liquid-cooled heat sink 4, the heat medium flow section 61 is a tubular section. The heat medium flow section 61 is flattened. One end 63 of the heat medium flow section 61 is the heat medium inlet section 11 of the cold plate 10 and is connected to one end 21 of the first pipe 20. The other end 64 of the heat medium flow section 61 is the heat medium outlet section 12 of the cold plate 10 and is connected to one end 31 of the second pipe 30.

[0072] The liquid-cooled heat sink 4 also includes a cold plate 10 having a heat medium flow section 61 formed on a plate-like member 60 with a solid interior, through which a heat medium in a liquid phase flows, and which releases heat absorbed from a heat generating element to the heat medium flowing through the heat medium flow section 61, a first pipe 20 having one end 21 connected to a heat medium inlet section 11 formed on the cold plate 10, a second pipe 30 having one end 31 connected to a heat medium outlet section 12 formed on the cold plate 10, a first manifold 40 connected to the other end 22 of the first pipe 20 and supplying the heat medium to the first pipe 20, and a second manifold 50 connected to the other end 32 of the second pipe 30 and receiving the heat medium from the second pipe 30, and a Vickers Since the hardness is 30HV or more and 40HV or less, the first pipe 20 and the second pipe 30 have appropriate flexibility, so that when the heating element is attached to the cage 100, the first pipe 20 and the second pipe 30 deform appropriately in accordance with the stress of the elastic body 102 in the direction of the liquid-cooled heat sink 4. As a result, even if the pressing load of the liquid-cooled heat sink 4 is 36 Newtons or less, thermal contact between the heating element and the liquid-cooled heat sink 4 can be ensured. Even if multiple heating elements are mounted in parallel on one cage 100, when the heating elements are attached to the cage 100, the stress at the time of attachment can be prevented from affecting the contact state between other adjacent heating elements and the liquid-cooled heat sink 4 through the first pipe 20 and the second pipe 30, etc.

[0073] Furthermore, in the liquid-cooled heat sink 4, the heat medium flow portion 61 of the cold plate 10 is a flattened tubular portion, which further improves the heat dissipation characteristics of the cold plate 10 to the heat medium.

[0074] Next, a liquid-cooled heat sink according to a fifth embodiment of the present invention will be described with reference to the drawings. The liquid-cooled heat sink according to the fifth embodiment has major components in common with the liquid-cooled heat sinks according to the first to fourth embodiments, and therefore the same components as those in the liquid-cooled heat sinks according to the first to fourth embodiments will be described using the same reference numerals. Note that Fig. 13 is a perspective view of a plurality of liquid-cooled heat sinks according to the fifth embodiment of the present invention arranged in parallel.

[0075] In the liquid-cooled heat sinks 1, 2, 3, and 4 according to the first to fourth embodiments, the cold plate 10 was not divided. Instead, as shown in FIG. 13, in the liquid-cooled heat sink 5 according to the fifth embodiment, the cold plate 10 is divided into multiple cold plate portions having a first cold plate portion 10-1 and a second cold plate portion 10-2.

[0076] One end 21 of the first pipe 20 is connected to the heat medium inlet 11 of the first cold plate section 10-1, and one end 31 of the second pipe 30 is connected to the heat medium outlet 12 of the second cold plate section 10-2.

[0077] Furthermore, the liquid-cooled heat sink 5 is provided with a third pipe 70 as a relay pipe connecting the first cold plate portion 10-1 and the second cold plate portion 10-2. One end 71 of the third pipe 70 is connected to the heat medium outlet portion 12 of the first cold plate portion 10-1, and the other end 72 of the third pipe 70 is connected to the heat medium inlet portion 11 of the second cold plate portion 10-2.

[0078] The liquid-cooled heat sink 5 also includes a cold plate 10 having a first cold plate portion 10-1 and a second cold plate portion 10-2 that are thermally connected to a heat generating element, have a heat medium flow space 13 formed therein through which a heat medium in a liquid phase flows, and release heat absorbed from the heat generating element to the heat medium flowing through the heat medium flow space 13, a first pipe 20 having one end 21 connected to a heat medium inlet portion 11 formed on the cold plate 10, a second pipe 30 having one end 31 connected to a heat medium outlet portion 12 formed on the cold plate 10, a first manifold 40 connected to the other end 22 of the first pipe 20 and supplying the heat medium to the first pipe 20, and a second manifold 50 connected to the other end 32 of the second pipe 30 and receiving the heat medium from the second pipe 30. Since the Vickers hardness of the first piping 20 and the second piping 30 is 30HV or more and 40HV or less, the first piping 20 and the second piping 30 have appropriate flexibility, so that when the heating element is attached to the cage 100, the first piping 20 and the second piping 30 deform appropriately in accordance with the stress of the elastic body 102 in the direction of the liquid-cooled heat sink 5. As a result, even if the pressing load of the liquid-cooled heat sink 5 is 36 Newtons or less, thermal contact between the heating element and the liquid-cooled heat sink 5 can be ensured. Even if multiple heating elements are mounted in parallel in one cage 100, when the heating elements are attached to the cage 100, the stress at the time of attachment can be prevented from affecting the contact state between the adjacent heating elements and the liquid-cooled heat sink 5 through the first piping 20 and the second piping 30, etc.

[0079] Furthermore, in the liquid-cooled heat sink 5, the cold plate 10 is divided into multiple cold plate sections having a first cold plate section 10-1 and a second cold plate section 10-2, which facilitates deformation of the piping of the liquid-cooled heat sink 5 and further facilitates thermal contact between the heat generating element and the liquid-cooled heat sink 5 even when the pressing load of the liquid-cooled heat sink 5 is 36 Newtons or less.Furthermore, when the heat generating element is attached to the cage 100, it is possible to more reliably prevent the stress generated during attachment from affecting the contact state between other adjacent heat generating elements and the liquid-cooled heat sink 5 through piping or the like.

[0080] Next, a liquid-cooled heat sink according to a sixth embodiment of the present invention will be described with reference to the drawings. The liquid-cooled heat sink according to the sixth embodiment has major components in common with the liquid-cooled heat sinks according to the first to fifth embodiments, and therefore the same components as those in the liquid-cooled heat sinks according to the first to fifth embodiments will be described using the same reference numerals. Note that Fig. 14 is a perspective view of a plurality of liquid-cooled heat sinks according to the sixth embodiment of the present invention arranged in parallel.

[0081] In the liquid-cooled heat sinks 1, 2, 3, 4, and 5 according to the first to fifth embodiments, the first pipe 20 and the second pipe 30 are both round tubes with a round radial shape. However, as shown in FIG. 14, in the liquid-cooled heat sink 6 according to the sixth embodiment, at least a portion of the first pipe 20 and the second pipe 30 has a flattened portion 80.

[0082] In the liquid-cooled heat sink 6, the first pipe 20 and the second pipe 30 are flattened in the region extending along the surface direction of the cold plate 10.

[0083] The liquid-cooled heat sink 6 also includes a cold plate 10 that is thermally connected to a heat generating element, has a heat medium flow space 13 formed therein through which a heat medium in a liquid phase flows, and releases heat absorbed from the heat generating element to the heat medium flowing through the heat medium flow space 13, a first pipe 20 having one end 21 connected to a heat medium inlet portion 11 formed in the cold plate 10, a second pipe 30 having one end 31 connected to a heat medium outlet portion 12 formed in the cold plate 10, a first manifold 40 connected to the other end 22 of the first pipe 20 and supplying the heat medium to the first pipe 20, and a second manifold 50 connected to the other end 32 of the second pipe 30 and receiving the heat medium from the second pipe 30, and a joint between the first pipe 20 and the second pipe 30. Since the Cars hardness is 30HV or more and 40HV or less, the first pipe 20 and the second pipe 30 have appropriate flexibility, so that when the heating element is attached to the cage 100, the first pipe 20 and the second pipe 30 deform appropriately in accordance with the stress of the elastic body 102 in the direction of the liquid-cooled heat sink 6. As a result, even if the pressing load of the liquid-cooled heat sink 6 is 36 Newtons or less, thermal contact between the heating element and the liquid-cooled heat sink 6 can be ensured. Even if multiple heating elements are mounted in parallel on one cage 100, when the heating elements are attached to the cage 100, the stress at the time of attachment can be prevented from affecting the contact state between other adjacent heating elements and the liquid-cooled heat sink 6 through the first pipe 20 and the second pipe 30, etc.

[0084] Furthermore, in the liquid-cooled heat sink 6, at least a portion of the first pipe 20 and the second pipe 30 is flattened, so that the liquid-cooled heat sink 6 can be made smaller, making it easier to install in a small space. [Explanation of symbols]

[0085] 1, 2, 3, 4, 5, 6 Liquid-cooled heat sink 10 Cold Plate 11 Heat medium inlet 12 Heat medium outflow part 13 Heat medium circulation space 20 First Pipe 30 Second Pipe 40 First manifold 50 Second Manifold 60 Plate-shaped member 61 Heat medium distribution section

Claims

1. It is a liquid-cooled heat sink that is connected to a cage that allows the heating element to be attached and detached, a cold plate that is thermally connected to the heat generating element, has a heat medium flow space formed therein through which a heat medium in a liquid phase flows, and releases heat absorbed from the heat generating element to the heat medium flowing in the heat medium flow space; or a cold plate that is thermally connected to the heat generating element, has a heat medium flow section formed on a solid plate-like member through which a heat medium in a liquid phase flows, and releases heat absorbed from the heat generating element to the heat medium flowing in the heat medium flow section; a first pipe having one end connected to a heat medium inlet portion formed in the cold plate; a second pipe connected at one end to a heat medium outlet portion formed in the cold plate; a first manifold connected to the other end of the first pipe and supplying the heat medium to the first pipe; a second manifold connected to the other end of the second pipe and configured to receive the heat medium from the second pipe; and one end of the first pipe is integrated with the heat medium inlet portion of the cold plate, and one end of the second pipe is integrated with the heat medium outlet portion of the cold plate; The other end of the first pipe is integrated with the first manifold, and the other end of the second pipe is integrated with the second manifold.

2. 2. The liquid-cooled heat sink according to claim 1, wherein the first pipe and the second pipe have a Vickers hardness of 30 HV or more and 40 HV or less.

3. 3. The liquid-cooled heat sink according to claim 1, wherein a plurality of the cold plates are arranged in parallel.

4. 3. The liquid-cooled heat sink according to claim 1, wherein the first pipe and the second pipe have portions at the same height relative to the cold plate.

5. The cold plate is a base plate having a heat receiving surface provided on one surface thereof and thermally connected to the heat generating element, and a heat transfer portion provided protruding from the heat receiving surface and through which heat from the heat receiving surface is transferred; a cover plate that covers the heat transfer portion and forms another surface opposite to the one surface, the cover plate having the heat medium inlet portion and the heat medium outlet portion provided therein; 3. The liquid-cooled heat sink according to claim 1, wherein the heat transfer portion is formed between the heat receiving surface of the base plate and the cover plate, and heat is released from the heat receiving surface and the heat transfer portion to the heat transfer medium flowing through the heat transfer portion.

6. 6. The liquid-cooled heat sink according to claim 5, wherein each of the plurality of heat transfer portions is a fin extending in a direction in which the heat medium flows through the heat medium flow space.

7. 3. The liquid-cooled heat sink according to claim 1, wherein at least a partial area of ​​the first pipe and the second pipe is flattened.

8. 3. The liquid-cooled heat sink according to claim 1, wherein the heat transfer medium flow portion of the cold plate is a flattened tubular portion.

9. the cold plate is divided into a plurality of cold plate sections, the cold plate having a first cold plate section and a second cold plate section; one end of the first pipe is connected to the first cold plate portion, and one end of the second pipe is connected to the second cold plate portion; 3. The liquid-cooled heat sink according to claim 1, wherein the first cold plate portion is connected to one end of a third pipe, and the second cold plate portion is connected to the other end of the third pipe.

10. 3. The liquid-cooled heat sink according to claim 1, wherein a cross-sectional area of ​​an internal space in the width direction of the first manifold is larger than a cross-sectional area of ​​an internal space in the width direction of the second manifold.

11. 3. The liquid-cooled heat sink according to claim 1, wherein the first pipe and / or the second pipe is a corrugated pipe.

12. 3. The liquid-cooled heat sink according to claim 1, wherein the first pipe and the second pipe are copper pipes.

13. 3. The liquid-cooled heat sink according to claim 1, wherein the diameter of the internal space of the first pipe is 2 mm or more and 4 mm or less, and the diameter of the internal space of the second pipe is 2 mm or more and 4 mm or less.

14. 3. The liquid-cooled heat sink according to claim 1, wherein the length of the first pipe is 50 mm or more, and the length of the second pipe is 50 mm or more.

15. 3. The liquid-cooled heat sink according to claim 1, wherein the heat generating element is an optical connector.

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