JP6202130B2 - Electronics - Google Patents

Description

  The present application relates to an electronic device that can cool a highly heat-generating component arranged in series with high efficiency and a cooling module mounted on the electronic device.

  In recent years, electronic devices such as servers have been increased in speed and functionality. Many electronic devices are mounted on such an electronic device, and these electronic devices generate heat with their operation. A CPU (central processing unit), which is one of electronic elements, has increased power consumption due to higher speed and higher functionality, and the amount of heat generated by the CPU tends to increase according to the amount of power supplied. In general, a server is equipped with a plurality of CPUs, and the amount of heat generated from these is great. If the temperature inside the server becomes high due to heat, the functions of the electronic elements are impaired, causing the server to fail. Become. Therefore, in order to maintain the function of the electronic element and avoid the failure of the server, it is necessary to cool the generated electronic element.

  As a radiator that takes heat of an electronic element that has generated heat and releases it to the outside, a liquid cooling system that takes heat of the electronic element that has generated heat by passage of a refrigerant flowing through a refrigerant pipe and releases heat to the outside is known (for example, Patent Document 1, Patent Document 2). In general, the liquid cooling system includes a heat receiving portion, a radiator, a pump, a manifold, and a plurality of pipes that connect each other to form a closed path. The heat receiving unit takes heat from the CPU to the refrigerant, and the radiator releases the heat of the refrigerant that has become high temperature by the taken heat to the outside such as air. The refrigerant flowing through the flow path formed by the piping is supplied with the force flowing through the flow path by the pump, and the manifold branches or merges the refrigerant flowing through the flow path.

Japanese Patent Laid-Open No. 5-109798

JP 2005-381126 A

  However, since the liquid cooling system has such a plurality of components, when the liquid cooling system is applied to a server, the space inside the server is limited, so the arrangement of each component in the server is considered. It cannot be installed without it. In addition, the server is equipped with an air cooling system that uses a fan to cool electronic components other than the CPU. The fan cools the electronic components by taking outside air as cooling air, and heat is taken away to produce hot air. Cooling air is discharged to the outside. For this reason, when a liquid cooling system is installed in addition to the existing air cooling system, there is a problem that the components of the liquid cooling system block the flow of cooling air supplied by the air cooling system, hindering cooling, and the mounting is difficult. It was happening.

  Furthermore, since electronic devices such as servers are installed in limited places such as a data center and a computer room, places where they can be installed are limited. In order to install many servers in a limited place, it is necessary to reduce the server size and reduce the occupied area at the time of installation. In recent years, server functions and performance have been expanded, and it has become popular to execute tasks, calculations, and the like that have been performed on a plurality of servers with a smaller number of servers. In addition, to improve the performance of a single server, the area occupied by the device is reduced. On the other hand, in order to improve the functions that can be executed by the server and the performance of the server, the electronic components in the server must be mounted at a higher density. There is a need. When electronic components are mounted in a server at a high density, how to efficiently cool the electronic components that generate heat is an issue.

  In one aspect, the present application provides an electronic device including an air cooling system, which can efficiently cool a plurality of CPUs arranged in series in the electronic device without obstructing a flow of cooling air in the air cooling system. It is another object of the present invention to provide a cooling module mounted on the electronic device. In another aspect, an electronic device that can be mounted in high density on a predetermined device in a space-saving manner, can secure a wide mounting area for parts other than the object to be cooled, and can ensure high reliability by having a redundant configuration of the pump. It is another object of the present invention to provide a cooling module mounted on the electronic device.

  According to one embodiment of the present invention, a fan, a circuit board positioned downstream of the cooling air generated by the fan and having a mounting surface parallel to the cooling air, and mounted on the circuit board, the cooling air And a plurality of memories mounted on the circuit board and cooled by the cooling air, wherein the circuit board is a region along the direction of the cooling air. A first area in which the plurality of processors are mounted, and a second area in which the plurality of memories are mounted and on both sides of the first area, and on both sides of each processor among the plurality of processors. Provided is an electronic device in which some of the plurality of memories are respectively arranged, and the one processor and the some of the plurality of memories arranged on both sides of the one processor are wired Is done.

(A) is a perspective view which shows the external appearance of the server which mounted multiple server modules provided with the cooling module which concerns on this application, (b) is the state which pulled out one server module from the rack cabinet of the server shown to (a). (C) is a perspective view showing a general internal configuration of one server module equipped with an air cooling system. (A) is an assembly diagram showing a state in which the liquid cooling module according to the present application is mounted on the server module of the first embodiment of the present application including an air cooling system, and (b) includes the air cooling system shown in (a). It is a top view which shows the state in which the cooling module was mounted in the server module. FIG. 2A is an assembled perspective view showing a state where the cooling module according to the present application is mounted on the main board in the server module including the cooling module shown in FIG. 2A, and FIG. 2B shows the state shown in FIG. FIG. It is a principal part expansion perspective view which shows the tank and pump in the cooling module shown to Fig.3 (a). (A) is a longitudinal cross-sectional view which shows an example of the internal structure of the tank shown in FIG. 4, (b) is sectional drawing in the BB line of (a). (A) is a perspective view which shows one Example of the structure of the connection part with a fin and refrigerant | coolant piping of the radiator shown in FIG. 3, (b) is a front view of the radiator shown to (a). (A) is explanatory drawing explaining the flow of the refrigerant | coolant in the cooling module shown to Fig.2 (a) and Fig.3 (a), (b) is the structure of the control circuit of the pump in the cooling module shown to (a). It is a circuit diagram which shows one Example. It is a flowchart which shows one Example of the control procedure of the control circuit of the pump shown in FIG.7 (b). It is explanatory drawing which shows arrangement | positioning of the heat generating components and memory in the server module which concerns on this application, and arrangement | positioning of the cooling module which cools heat generating components. It is a disassembled perspective view which shows the specific structural member of the cooling module single-piece | unit based on this application. (A) is a comparative diagram comparing the flow of cooling air flowing through a server module equipped with an air cooling system and the flow of cooling air when a wall is installed in the center of the server module, and (b) shows the ceiling of the wall. Cross-sectional view showing the covered embodiment, (c) is an explanatory diagram showing the flow of cooling air when a curved portion is provided on the upstream side of the wall, (d) is a case where a tapered portion is provided on the upstream side of the wall It is explanatory drawing which shows the flow of cooling air. It is an assembly perspective view which shows the Example which has arrange | positioned the water leak tray between the cooling module shown in Fig.3 (a), and the main board. (A) is a perspective view which shows the state which mounted the water leak tray and the water cooling system on the main board shown in FIG. 12, (b) is principal part sectional drawing of the server module shown to (a). (A) is principal part sectional drawing of the server module shown in FIG. 13, (b) is a schematic sectional drawing which shows the structure of the water leak tray which shows the 2nd Example of the water leak tray shown to (a), (c). (A) is a schematic sectional view showing the structure of a water leakage tray showing a third embodiment of the water leakage tray shown in (a), and (d) is a fourth embodiment of the water leakage prevention structure of the cooling module shown in (a). It is a schematic sectional drawing which shows the structure of the water leak tray shown. (A) is a partial enlarged perspective view showing the configuration of six pumps and heat receiving members arranged on both sides of the tank of the cooling module, and (b) is a holding structure for holding the six pumps shown in (a) obliquely. It is a partial expansion perspective view shown. It is a top view which shows the 2nd Example of the server module 1 by which the air cooling system and the cooling module of this application are mounted. It is a top view which shows a mode that the cooling air of an air cooling system is sent to the connection mechanism of the upper and lower server modules provided in the back side of the server module of the 2nd Example shown in FIG. It is an assembly perspective view which shows the 3rd Example of this application which attaches two main boards with which the cooling module was attached in one server module. It is a perspective view which shows the structure of the bottom face of the upper main board shown in FIG. It is a perspective view of the principal part of the server module in the state where the 2nd system unit was piled up on the 1st system unit shown in FIG.

  Hereinafter, embodiments of the present application will be described in detail based on specific examples with reference to the accompanying drawings. In the embodiment described below, a server module that forms a server as an electronic device will be described as an example, but the electronic device is not limited to this. In the following embodiments, constituent members having the same function will be described with the same reference numerals.

  FIG. 1A is a perspective view showing an appearance of a rack mount server 100 in which a server module 1 including a liquid rejection system according to the present application is mounted on a rack cabinet 9. The rack mount server 100 is a kind of information processing apparatus, and a single or a plurality of server modules 1 are mounted in the rack cabinet 9. Cooling air for cooling the server module 1 is sucked from the front, cools the internal elements of the server module 1, and is exhausted from the back.

  FIG. 1B is a partially enlarged view showing a state in which one server module 1 is pulled out from the rack cabinet 9 shown in FIG. 1A, and FIG. It is a perspective view which shows the structure of an air cooling system. Inside the server module 1, a first heat generating component 2 is located upstream of the fan 5 with respect to the flow of cooling air, and a CPU (second heat generating component) 3, an electronic component 4, etc. Is arranged. The first heat generating component 2 is an electronic component such as a hard disk or SSD (solid state disk). The CPU 3, the electronic component 4, and other heat generating components and electronic components are cooled by the cooling air from the fan 5.

  FIG. 2A shows the server module 1 according to an embodiment of the present application, and is an assembly view in plan view of a state in which the liquid cooling system 10 is mounted on the server module 1 including the air cooling system. Hereinafter, the liquid cooling system 10 may be referred to as a cooling module 10. Moreover, FIG.2 (b) is a top view which shows the state by which the liquid cooling system 10 was mounted in the server module 1 provided with the air cooling system shown to Fig.2 (a). The air cooling system includes a plurality of fans 5 that generate cooling air. The main board 6 on the upstream side of the fan 5 is provided with the first heat generating component (hard disk, SSD, etc.) described in FIG. 1C, but the illustration thereof is omitted here.

  In the present application, an area on the main board 6 on the downstream side of the fan 5 of the server module 1 is divided into a first area A1 and a second area A2 by a straight line along the direction in which the cooling air CA flows. The first region A1 is a region where a plurality of heat generating components (here, heat generating components 3A and 3B) are arranged, and the plurality of heat generating components 3A and 3B are arranged in series along the direction in which the cooling air CA flows. Has been. The heat generating components 3A and 3B are CPUs 3A and 3B, for example, and are components requiring strong cooling that generate a large amount of heat. In this embodiment, the CPU 3B is arranged on the downstream side of the CPU 3A. Therefore, the heat generating components 3A and 3B may be hereinafter referred to as CPUs 3A and 3B or components 3A and 3B requiring strong cooling. The second area A2 is an area located on both sides of the first area A1 (there may be one side of the first area A1), and an electronic component (weakly cooling required component) 4 that can be cooled with cooling air is disposed. It is an area to be done.

  The CPUs 3 </ b> A and 3 </ b> B arranged in the first region A <b> 1 are cooled by the liquid cooling system 10 because they are components that require strong cooling that cannot be sufficiently cooled by cooling air. In the portion where the liquid cooling system 10 is disposed, a part having a calorific value of 1 W or less that does not require cooling air is also disposed. The arrangement of the CPUs 3A and 3B may not be in series with the flow direction of the cooling air as long as it is within the area where the liquid cooling system 10 is arranged. The electronic component 4 disposed in the second region A2 can be cooled by supplying cooling air, or can be cooled by supplying cooling air and attaching a radiator such as a heat sink. It is an electronic component having a calorific value, and is also referred to as a component requiring weak cooling. Examples of such an electronic component 4 include a DIMM (memory module) and a power supply component.

  The first area A1 and the second area A2 described above are strip-shaped rectangular areas, and areas that are not shredded are secured. This is because when the area on the main board 6 is finely divided by the components of the liquid cooling system 10, the space between the air cooling parts is limited by the liquid cooling system 10, and the circuit configuration required by the system is realized. It will be difficult. The position of the first area A1 on the main board 6 is determined by the size and position of the second area A2, and is generally slightly shifted from the center of the main board 6. Moreover, the area of 2nd area | region A2 located in the both sides of 1st area | region A1 does not need to be the same.

  In this application, the area on the main board 6 on the downstream side of the cooling air CA of the air cooling system is divided into the first area A1 and the second area A2, and the cooling to the second area A2 is performed. A liquid cooling system 10 that does not inhibit the flow of the wind CA is mounted in the first region A1. The liquid cooling system 10 generally includes a radiator that cools the refrigerant, a heat receiving member that draws heat from the heat-generating component (heat absorption), a refrigerant pipe that flows the refrigerant from the radiator to the heat receiving member, and a pump that moves the refrigerant in the refrigerant pipe. . The heat receiving member is also called a cooling jacket.

  In the embodiment shown in FIGS. 2A and 2B, the radiator 11 is provided on the downstream side of the fan 5 so as to be sufficiently cooled by the cooling air CA. Usually, it is provided in a direction perpendicular to the flow direction of the cooling air CA, and is arranged so that all the cooling air CA supplied by the fan 5 can be supplied. The length of the radiator 11 is shorter than the total length of the plurality of fans 5 arranged side by side. The heat receiving member 12 is provided on each CPU 3, and the refrigerant pipe 13 for supplying the refrigerant from the radiator 11 to the heat receiving member 12 is provided on the main board 6 so as not to enter the second region A2. . The radiator 11 has a plurality of flow paths, and the refrigerant pipe 13 is connected to the plurality of flow paths of the radiator 11 by a manifold 16. And between the refrigerant | coolant piping 13 and the heat receiving member 12, the tank 15 which stores a refrigerant | coolant temporarily, and the pump 14 which moves a refrigerant | coolant are provided. The pump 14 will be described in detail later, but a plurality of pumps 14 are installed on both sides of the tank 15. If the capacity of the pump 14 is large, the pump 14 can be provided only on one side of the tank 15.

  In this structure, since the pump 14 and the tank 15 are gathered and installed on the heat receiving member 12 so as to be adjacent to each other, the refrigerant pipe 13 connecting them can be shortened, and the space can be saved. The flow path resistance when the refrigerant flows in the refrigerant pipe 13 depends on the length of the refrigerant pipe 13, and thus the refrigerant pipe 13 can be shortened, thereby reducing the flow path resistance of the refrigerant flowing in the liquid cooling system 10. can do. Further, since the amount of movement of the refrigerant increases, the heat transfer from the heat receiving unit 12 to the radiator 11 is made efficient, so that the performance of the liquid cooling system 10 can be improved.

  Furthermore, since the components requiring strong cooling are concentrated in the first area A1 while avoiding the second area, the components of the liquid cooling system 10 can also be concentrated in the first area A1. As a result, the second region A2 can be secured widely rather than being cut. Moreover, the liquid cooling system 10 can sufficiently supply the cooling air CA to the electronic component 4 mounted in the second area A2 without inhibiting the cooling air CA from flowing into the second area A2. Due to these advantages, the performance of the liquid cooling system 10 is improved, and the liquid components without cooling the electronic components 4 that are cooled by the cooling air CA are cooled while cooling the heat generating components 3A and 3B having a high heat generation of about 300W. The cold system 10 can be mounted on the server.

  3A is an assembled perspective view showing a state in which the liquid cooling system 10 is mounted on the main board 6 shown in FIG. 2A, and FIG. 3B is a server module shown in FIG. 1 is a perspective view of FIG. As can be seen from these drawings, the electronic component 4 is actually many electronic components mounted on one or both sides of the child board 4A, and the child board 4A is provided on the main board 6. It is attached to the socket 4B. Further, since six pumps 14 are connected in parallel to one tank 15, the flow rate of the refrigerant can be increased.

  Here, the arrangement of the child board 4A on which the electronic component 4 is mounted and the connection characteristics with the CPUs 3A and 3B will be described with reference to FIG. Here, the electronic component 4 is a memory (DIMM), and the DIMM 4 has a structure in which a plurality of DRAM elements are mounted on both sides or one side of the slave board 4A. Hereinafter, the electronic component 4 may be referred to as a memory 4 or a DIMM 4. A plurality of child boards 4A are arranged on both sides of the CPUs 3A and 3B in parallel with the flow of the cooling air CA. For this reason, the physical wiring length between the DIMM 4 and the CPUs 3A and 3B can be the shortest distance.

  The CPUs 3A and 3B include a system controller 3S and a memory access controller 3M, and the memory 4 performs data transfer with the CPUs 3A and 3B via the memory access controller 3M and the system controller 3S. Data transfer between each element takes time according to the wiring length (physical distance) between each element, and during that time, data processing in the CPU is stopped. In the present embodiment, as described above, the physical wiring length between the memory 4 and the CPUs 3A and 3B can be the shortest distance. Therefore, the time until the data transfer is completed (memory latency) is short, and the data processing of the entire system takes place. Time can be shortened.

  That is, in this embodiment, the main board 6 is designed with the highest priority placed on the arrangement of the CPUs 3A and 3B and the memory 4, and the liquid cooling system 10 is arranged in accordance with the arrangement of the components 3 requiring strong cooling on the main board 6. ing. Therefore, in the present embodiment, the liquid cooling system 10 is disposed at a location shifted from the center of the main board 6, and the air cooling system has a right / left non-target area ratio.

  FIG. 4 is an essential part enlarged perspective view showing the structure of the refrigerant pipe 13, the pump 14 and the tank 15 in the liquid cooling system 10 shown in FIG. The refrigerant pipe 13 includes a cold water pipe 13C through which a low-temperature refrigerant cooled by a radiator flows, and a hot water pipe (not shown) through which a high-temperature refrigerant that has absorbed heat from a heat-generating component and has risen in temperature. The cold water pipe 13 </ b> C is connected to a tank 15, and six pumps 14 are provided in the tank 15. The pump 14 sucks the refrigerant temporarily stored in the tank 15 through the suction pipe 14S and returns it to the tank 15 through the discharge pipe 14D. The six pumps 14 are attached to the tank 15 in an inclined state in order to reduce the height from the heat receiving member 12. The refrigerant returned from the six pumps 14 into the tank 15 merges and is supplied to a heat receiving member (not shown) through the cold water pipe 13C. The structure of the heat receiving member will be described later. Although illustration is omitted inside the pump 14, the reverse flow of the refrigerant is prevented when the pump fails.

  5A is a longitudinal sectional view showing an example of the internal structure of the tank 15 shown in FIG. 4, and FIG. 5B is a sectional view taken along line BB in FIG. 5A. As can be seen from these drawings, the inside of the tank 15 is divided into two rooms by a partition wall 15W. One room is the storage chamber 15S, and the refrigerant pipe 13 connected to the radiator and the suction pipe 14S of the pump 14 are connected. The other chamber is the mixing chamber 15M, and the refrigerant pipe 13 connected to the heat receiving member and the discharge pipe 14D of the pump 14 are connected. The refrigerant from the radiator flows into the storage chamber 15S and is temporarily stored. At this time, the air contained in the refrigerant accumulates in the ceiling portion of the storage chamber 15S. Since the suction pipe 14S of the pump 14 is connected to a portion near the bottom surface of the storage chamber 15S and sucks out the refrigerant, the air accumulated in the ceiling portion of the storage chamber 15S does not enter the pump 14. The refrigerant from each pump 14 flows into the mixing chamber 15M through the discharge pipe 14D, is mixed, and is discharged from the refrigerant pipe 13. The shape of the partition wall 15W is not limited to this embodiment.

  6A is a perspective view showing a configuration of an embodiment of the radiator 11 in the present application, and FIG. 6B is a front view of the radiator 11 shown in FIG. 6A. The radiator 11 of this embodiment is provided with four heat radiation channels on the left side and four heat radiation channels on the right side with the manifold 16 as the center. Each flow path has a shape in which a flat flow path is folded in a U-shape, and corrugated fins 11F are provided between the opposed flow paths to increase heat dissipation efficiency.

  Each flow path is connected to the manifold 16. The manifold 16 has a refrigerant inlet portion 16H and a refrigerant outlet portion 16C. The refrigerant inlet 16H is connected to one end of the four heat radiation channels on the left side of the manifold 16 inside the manifold 16, and the refrigerant outlet 16C is on the right side of the manifold 16 inside the manifold 16. It is connected to one end of the four heat radiation channels. The other ends that are not connected to the refrigerant inlet portion 16H and the refrigerant outlet portion 16C of the left and right heat radiation channels communicate with each other inside the manifold 16.

  Refrigerant (warm water) that has flowed into the refrigerant inlet 16H from a refrigerant pipe (not shown) flows into the four heat radiation passages on the left side of the manifold 16, returns to the manifold 16 by making a U-turn at the end, and then the manifold 16 It flows into the four heat dissipation channels on the right side. The refrigerant that has flowed into the four heat radiation channels on the right side of the manifold 16 makes a U-turn at the end, returns to the manifold 16 again, is discharged from the refrigerant outlet portion 16C, and flows into a refrigerant pipe (not shown). The refrigerant flowing in from the refrigerant inlet portion 16H is hot water, but the refrigerant discharged from the refrigerant outlet portion 16C is cold water because it is cooled by the heat dissipation flow path of the radiator 11.

  Fig.7 (a) is explanatory drawing explaining the flow of the refrigerant | coolant in the liquid cooling system 10 shown to Fig.2 (a) and Fig.3 (a), FIG.7 (b) is shown in Fig.7 (a). 2 is a circuit diagram showing an embodiment of a configuration of a pump control circuit in the liquid cooling system 10. FIG. As described above, the refrigerant is cooled by the radiator 11, and after flowing into the tank 15 by the cold water pipe 13H, the refrigerant is sent to the heat receiving member 12 by the pump 14 to cool the heat-generating component, and the refrigerant whose temperature has risen is cooled by the hot water pipe 13H. Return to 11.

  Although not shown, each pump 14 is provided with a rotation speed detection sensor, and the operation of each pump 14 is monitored by a control circuit (service processor) 20 to which the rotation speed signal (pulse signal) is input. . The control circuit 20 includes a conversion circuit 21 that converts a pulse signal into a rotation speed signal, a threshold determination circuit 22 that compares the rotation speed of each pump 14 with a threshold value, and whether the pump 14 is normal based on an output from the threshold determination circuit 22. There are a component determination circuit 23 and a system determination circuit 24 for determining whether or not.

  For example, when one pump 14 out of six pumps 14 fails, the rotation speed signal from one pump 14 is not input to the control circuit 20, but the control circuit 20 is not It is determined that there is no problem in cooling the heat-generating component by the liquid cooling system 10. The component determination circuit 23 outputs a notification that one of the pumps 14 has failed, while the system determination circuit 24 outputs a continuation of operation of the liquid cooling system (OK), and the heat generating component 3 by the liquid cooling system 10 is output. Cooling continues. By providing redundancy in the control of the pump 14 in this way, even if the pump 14 breaks down, if the cooling capacity can be ensured, the liquid cooling system 10 does not stop and the cooling of the CPU can be continued. Reliability can be ensured.

  FIG. 8 is a flowchart showing an embodiment of a control procedure of the control circuit 20 of the pump 14 shown in FIG. When the operation of the liquid cooling system is started in step 801, the control circuit 20 reads the rotational speed x of each pump in step 802. While the server module is operating, the pump speed is constantly monitored by the control circuit. In step 803, it is determined whether the rotation speed x of each pump is greater than or equal to a threshold value (2050 rpm). If the rotational speed x of all the pumps is equal to or greater than the threshold value (YES), the process returns to step 802, and reading of the rotational speed x of each pump is continued.

  On the other hand, if it is determined in step 803 that the pump rotation speed x does not exceed the threshold value (NO), the process proceeds to step 804, the pump failure is notified, and the process proceeds to step 805. In step 805, it is determined whether or not there is one pump failure. If there is one pump failure (YES), it is determined that there is no problem in cooling the heat-generating parts by the liquid cooling system as described above. Returning to step 802, reading of the rotational speed x of each pump is continued. However, if it is determined in step 805 that there are a plurality of pump failures (NO), it is determined that there is a problem in cooling the heat-generating component by the liquid cooling system, and the process proceeds to step 806 to stop the operation of the cooling system. This routine ends.

  FIG. 10 is an exploded perspective view showing in detail the configuration of members under the pump 14 and the tank 15 in the liquid cooling system 10 according to the present application. A pump support mechanism 50 and a heat receiving member 12 are provided below the pump 14 and the tank 15, and the heat receiving member 12 is fixed on a main board (not shown) by a heat receiving member fixing component 17. A female screw is formed inside the heat receiving member fixing component 17 and is screwed into the male screw 19 shown in FIG. The pump support mechanism 50 includes a pump placement portion 51, a base plate 52, a mounting portion 54, and a bracket (pump mounting bracket) 55. The heat receiving member 12 includes a sheet metal 40, a CPU sheet metal 60, and a cold plate 90.

  The sheet metal 40 has a stepped portion 41, a CPU power supply sheet metal portion 42, a CPU sheet metal portion 43, a hole 44 for avoiding interference with a mounted component, a recess 45, and a hole 46 through which the heat receiving member fixing component 17 is inserted. . The CPU metal plate 60 has a mounting hole 62 through which the base plate 61 and the heat receiving member fixing component 17 are inserted. The cold plate 90 includes a cold water inlet 91, a refrigerant flow path 92, a CPU cold plate 93, a U-turn flow path 94, and a CPU power supply cold plate 95. Each member constituting the metal plate 40, the CPU metal plate 60, and the cold plate 90 will be described in detail later using an enlarged drawing.

  Here, the windbreak wall and the water leakage tray provided in the server module of the present application will be described. FIG. 11A is a comparison diagram comparing the flow of the cooling air CA flowing through the server module 1 including the air cooling system and the flow of the cooling air CA when the windbreak wall 7 is installed in the center of the server module 1. is there. When there is no windbreak wall 7 in the server module 1, the cooling air CA generated by the fan has a flow resistance in a portion where the electronic components 4 are densely packed, so that the heat generating component 3 with a short height (CPU 3 </ b> A, 3 </ b> B). Mainly flows on the main board 6 on which is mounted.

  The flow path resistance is generated due to a high density mounting and a narrow interval between components on the main board 6 and a high level of components mounted in the region. That is, since the electronic component 4 has a structure in which a circuit is formed on a child board 4A standing perpendicular to the main board 6 such as a DIMM or a power supply module, the electronic component 4 is tall. As a result, the DIMM, the power supply module, etc. block the flow path resistance. On the other hand, since the CPUs 3A and 3B are directly mounted on the main board 6, they are shorter than DIMMs, power supply modules and the like. The height of the DIMM from the board 6 is, for example, 33 mm. Further, the height of the water leakage tray 8 from the board 6 is, for example, 26.5 mm. The lower limit of the height of the water leakage tray 8 for preventing water leakage is about half 13 mm, and the upper limit of the height of the water leakage tray 8 for not contacting the top plate of the housing is 35 mm. Within this height range, it is expected that the cooling efficiency of the DIMM and the power source is improved without leakage.

  Even when the liquid cooling system 10 as described above is provided on the main board 6 on which the short heat generating component 3 is mounted as indicated by a broken line, the cooling air CA flows around the liquid cooling system. The cooling capacity of the electronic component 4 by the wind CA decreases. That is, only the parts that require strong cooling that is subject to liquid cooling and the parts that require weak cooling with low heat generation (including no heat generation) that do not require air cooling are mounted in the area within the broken line, and cooling air must be supplied. Despite not, cooling air flows. For this reason, the cooling air supplied to the electronic component 4 which needs to be relatively supplied with cooling air is reduced, so that the cooling performance of the electronic component 4 is lowered.

  Therefore, in order to prevent the cooling air CA from flowing around the heat generating component 3, the periphery of the liquid cooling system 10 mounted on the heat generating component 3 is covered with the windbreak wall 7, and the cooling air CA flows into the component 3 requiring strong cooling. Do not. As a result, the cooling air can be prevented from flowing into the area where the cooling air supply is not required, and all of the cooling air can be supplied to the weakly-cooled components 4 that require the cooling air. The cooling capability of the electronic component 4 by CA improves.

  Further, as shown in FIG. 11 (b), a ceiling wall 70 is formed on the heat generating component 3 mounted on the main board 6 and the windbreak wall 7 provided around the liquid cooling system 10. If the entire liquid cooling system 10 is covered with a wall, the cooling capacity of the electronic component 4 by the cooling air CA is further improved. When the windbreak wall 7 is provided around the heat generating component 3 and the liquid cooling system 10, as shown in FIG. 11C, a curved portion is provided on the upstream side of the windbreak wall 7, or as shown in FIG. Thus, if a taper part is provided in the upstream of the windbreak wall 7, the cooling wind CA will flow easily to the electronic component side.

  By the way, in the liquid cooling system 10 described so far, since the refrigerant to be cooled is a liquid (for example, water), the refrigerant is connected from the refrigerant pipe 13 or the refrigerant pipe 13 to the heat receiving member 12, the pump 14 or the tank 15. May leak. And if a refrigerant | coolant leaks from the liquid cooling system 10, there exists a possibility that the leaked refrigerant | coolant may overflow on the main board 6, the electronic component 4 may be flooded, and a circuit may be short-circuited. Therefore, it is conceivable to install a water leakage tray below the heat receiving member of the liquid cooling system 10, the pump 14 and the tank 15 to prevent the leaked refrigerant from flowing out to other places.

  12 is an assembly perspective view showing a state in which the water leakage tray 8 is inserted between the main board 6 shown in FIG. 3A and the liquid cooling system 10 attached on the main board 6. FIG. 3A is a perspective view showing a state in which a water leakage tray 8 and a liquid cooling system 10 are mounted on a main board 6. It is assumed that CPUs 3A and 3B, a socket 4B for attaching a child board, and CPU power supply circuits 30A and 30B are mounted on the main board 6. Further, the liquid cooling system 10 includes the radiator 11, the heat receiving member 12, the refrigerant pipe 13, the pump 14, the tank 15, and the manifold 16, as described above.

  The water leakage tray 8 includes a base plate 80, CPU contact holes 8 </ b> A and 8 </ b> B, power supply circuit contact holes 8 </ b> HA and 8 </ b> HB, and a windbreak wall 7 protruding around the base plate 80. The CPU contact holes 8A and 8B are holes through which the CPUs 3A and 3B on the main board 6 are inserted, and the power circuit contact holes 8HA and 8HB are through the CPU power supply circuits 30A and 30B. It is a hole. A sleeve 8S is provided on the base plate 80 between the CPU contact holes 8A and 8B. The sleeve 8S will be described later.

  The windbreak wall 7 is formed by extending the outer edge of the base plate 80 of the water leakage tray 8 and bending it upward. This is because a bent portion is required at the outer edge portion of the base plate 80 of the water leakage tray 8 so as to keep the water leakage from the liquid cooling system 10 in the water leakage tray 8. The height is increased and the windbreak wall 7 is also used. When the water leakage tray 8 is mounted on the main board 6 and the liquid cooling system 10 is mounted thereon, as shown in FIG. 13 (a), the wind barrier 7 protrudes around the pump 14 and the tank 15, and the cooling wind Will not enter the area where the pump 14 and the tank 15 are.

  FIG. 13B is a cross-sectional view of the liquid cooling system 10 shown in FIG. 13A in a direction perpendicular to the flow of cooling air. The heat receiving member fixing component 17 is a screw component around which a spring 17B is wound, and the sheet metal 40, the CPU sheet metal 60, the water leakage tray 8 and the main board 6 are inserted from the sheet metal 40 side, and the back side of the main board 6 is inserted. And is fixed to the fixing plate 18 attached to the screw. The spring 17B is inserted between the head 17H of the heat receiving member fixing component 17 and the sheet metal 40, and urges the sheet metal 40 toward the main board 6 side. From this figure, all the parts in the range from the cold water pipe 13C and the hot water pipe 13H to the refrigerant flow path 92 of the cold plate are accommodated inside the windbreak wall 7, and the cooling air does not enter the liquid cooling system 10. I understand that.

  On the other hand, FIG. 14A is a partial cross-sectional view of the liquid cooling system 10 shown in FIG. 13A in the direction along the flow of the cooling air. FIG. 14A shows only the CPU 3A, and the cross section on the CPU 3B side is omitted. Also from this figure, the heat receiving member fixing component 17 is screwed to the male screw 19 and the fixing plate 18 on the back side of the main board 6, and the spring 17B biases the sheet metal 40 from the head 17H side to the main board 6 side. I understand that.

  Here, the engaged state of the sheet metal 40, the CPU sheet metal 60 and the cold plate 90 shown in FIG. 10, and the main board 6 and the water leakage tray 8 shown in FIG. 12 will be described with reference to FIG. On the main board 6, a first component 30A1, a second component 30A2, and a CPU 3A are mounted as a CPU power supply circuit 30A. In a state where the water leakage tray 8 is attached to the main board 6, the CPU power supply circuit 30A enters the power contact hole 8HA of the water leakage tray 8, and the CPU 3A enters the CPU contact hole 8A of the water leakage tray 8. . On the surface of the base 80 of the water leakage tray 8 on the main board 6 side, the CPU contact holes 8A and 8B may be surrounded by packing. The packing adheres to the periphery of the CPUs 3A and 3B, and the water stop effect is enhanced.

  The cold plate 90 shown in FIG. 10 includes a CPU cold plate 93 and a CPU power supply cold plate 95. The CPU cold plate 93 has two flow paths, one end of which is connected to the cold water inlet 91 and the other end is connected to the U-turn flow path 94. The other flow path has one end connected to the U-turn flow path 94 and the other end connected to the refrigerant flow path 92. The refrigerant channel 92 is internally divided into two, and the refrigerant channel 92 having the cold water inlet 91 and the refrigerant channel 92 from which the refrigerant passes through the U-turn channel 94 do not communicate with each other. Therefore, the entire amount of the refrigerant returning to the refrigerant flow path 92 through the U-turn flow path 94 flows into the CPU power supply cold plate 95 and flows into the hot water pipe 13H of the refrigerant pipe 13. The flow of the refrigerant is indicated by arrows in FIG.

  When the liquid cooling system 10 is mounted on the water leakage tray 8, the CPU cold plate 93 of the cold plate 90 forming the heat receiving member 12 is positioned immediately above the CPU 3A, and the CPU power cold plate 95 is the CPU power supply circuit 30A. Located directly above. At this time, the CPU 3A overlaps with the CPU cold plate 93 via the heat conductive sheet 31, but the first component 30A1 of the CPU power supply circuit 30A is short so that it does not overlap with the CPU power cold plate 95. Therefore, a metal bar 32 for contacting the CPU power cold plate 95 is provided on the first component 30A1 of the CPU power circuit 30A via the heat conductive sheet 31.

  The CPU sheet metal 60 is provided with attachment holes 62 at the four corners of the base plate 61, and the base plate 61 is provided so as to overlap the CPU cold plate 93 by the heat receiving member fixing parts 17 inserted through the attachment holes 62.

  The sheet metal 40 includes a CPU sheet metal portion 43, and the CPU sheet metal portion 43 is provided with holes 46 that overlap the mounting holes 62 at the four corners of the base plate 61. There is a stepped portion 41 at one end of the sheet metal 40, and this stepped portion 41 has a spring property. The CPU power sheet metal part 42 following the step part 41 is one step lower than the CPU sheet metal part 43 and is formed so as to approach the main board 6 when attached. In the state where the sheet metal 40 is attached by the heat receiving member fixing component 17, the CPU sheet metal portion 43 overlaps the base plate 61 of the CPU sheet metal 60, and the CPU power supply sheet metal portion 42 overlaps the CPU power supply cold plate 95. When the CPU sheet metal portion 43 of the sheet metal 40 overlaps the base plate 61 of the CPU sheet metal 60, the height of the lower surface of the CPU power sheet metal portion 42 from the main board 6 is the upper surface of the CPU power cold plate 95. The height from the main board 6 is lower. Therefore, in a state where the sheet metal 40 is attached by the heat receiving member fixing component 17 and the CPU power supply sheet metal part 42 is overlapped with the CPU power supply cold plate 95, the CPU power supply cold plate 95 is moved to the CPU due to the spring property of the step part 41. It is energized by the power sheet metal part 42.

  With the above configuration, the heat generated by the components in the CPUs 3A and 3B and the CPU power supply component 30A arranged in the first area A1 of the main board 6 is generated by the CPU cold plate 93 and the CPU power supply cold. Heat is absorbed by the plate 95.

  It should be noted that the water leakage tray 8 for preventing water leakage from the liquid cooling system 10 leaked from the liquid cooling system 10 when the bottom plate has a double structure as shown in FIGS. 14 (b) and 14 (c). It is difficult to escape the refrigerant. 14B shows an embodiment in which the drain 83 is provided on the double bottom 84, and FIG. 13C shows the configuration of the embodiment in which two inclined bottoms 85 and 86 are provided. Further, the refrigerant leaked from the liquid cooling system 10 by inserting the water absorption sheet 87 into the bottom plate of the water leakage tray 8 as in another embodiment shown in FIG. It is possible to make it difficult to escape.

  FIG. 15A is a partially enlarged perspective view showing the attachment state of the six pumps 14 arranged on both sides of the tank 15 of the liquid cooling system 10. As described above, the six pumps 14 are connected to the tank 15, and the refrigerant is supplied to the tank 15 from the cold water pipe 13 </ b> C of the refrigerant pipe 13. The pump 14 and the tank 15 are connected by a suction pipe 14S and a discharge pipe 14D, and the refrigerant in the tank 15 is sucked out by the pump 14, pressurized, and returned to the tank 15. The refrigerant pressurized by the pump 14 is supplied to the heat receiving member 12 through the cold water pipe 13C from the end of the tank 15 on the side opposite to the supply side. Since the structure of the heat receiving member 12 has already been described, the same components are denoted by the same reference numerals and description thereof is omitted. The refrigerant that has absorbed heat is returned from the CPU power cold plate 95 of the heat receiving member 12 to the hot water pipe 13H.

  FIG. 15B is a partially enlarged perspective view for explaining the structure of the pump support mechanism 50 by removing the six pumps 14 from the structure shown in FIG. In the tank 15, an attachment leg 15 </ b> A provided on the refrigerant pipe 13 side is fixed to the base plate 52 of the pump support mechanism 50 with a screw 53. Also, the base plate 52 is fixed with screws 53 at the both ends of a bracket 55 having three pump placement portions 51. In order to arrange the pump 14 obliquely with respect to the tank 15, the pump placement portion 51 is a right-angle groove. On the side surface of the tank 15, there are a discharge port 15T for sending the refrigerant to the pump 14 and a suction port 15K through which the refrigerant flows from the pump. The bracket 50 is made of, for example, SUS (stainless steel plate). A buffer plate sandwiched between the bracket 55 and the pump 14 is attached to the pump placement portion 51. With this buffer plate, even if a deviation occurs due to deformation of the heat receiving member 12 and the tank 15 or a dimensional tolerance at the time of manufacture, this deviation can be absorbed.

  FIG. 16 is a plan view showing a second embodiment of the server module 1 on which the air cooling system and the liquid cooling system 10 of the present application are mounted. The server module 1 of the second embodiment is different from the above-described embodiment in that a connection unit (hereinafter referred to as XB) that connects the main boards 6 in the server module 1 stacked in the vertical direction on the back side of the server module 1. 71 is referred to as a unit). The XB unit 71 is provided on the downstream side of the cooling air flow in the second region A2 on one side of the first region A1 including the liquid cooling system 10. Since the configuration of the liquid cooling system 10 in the first region A1 and the configuration of the second region A2 arranged on both sides of the first region A1 are the same as those in the above-described embodiment, The same reference numerals are given and description thereof is omitted.

  When the XB unit 71 is provided in the server module 1 as in the second embodiment of the server module 1, the XB chip 73 in the XB unit 71 generates heat during operation as shown in FIG. 17. Is present. The XB chip 73 is a component that requires weak cooling that needs to be cooled by cooling air. Therefore, in the second embodiment of the server module 1, the first area A1 and the two second areas A2 are shifted to one side with respect to the casing with respect to the casing of the server module 1. The cooling air CA is sent to the XB unit 71 through a portion vacated by the shift.

  FIG. 18 shows a third embodiment of the server module 1 of the present application in which a liquid cooling system 10 is provided and two main boards 6 are mounted in the server module 1 of the second embodiment described in FIGS. FIG. Here, the main board 6 having the first and second areas A1 and A2, in which the heat-generating components and electronic components already described are mounted, and having the liquid cooling system 10 is referred to as a system unit. . Then, in the server module 1 of the third embodiment, the first system unit U1 is first attached on the housing, and the second system unit U2 is attached to the upper side of the first system unit U1. . The position of the electronic component on the main board 6 of the first system unit U1 and the position of the electronic component on the main board 6 of the second system unit U2 are exactly the same.

  In this case, a connection connector 70 as shown in FIG. 19 is attached to the bottom surface of the main board 6 of the second system unit U2. The connection connector 70 connects the circuit in the second system unit U2 to the circuit in the first system unit U1 when the second system unit U2 is attached to the upper side of the first system unit U1. Is for. When the first system unit U1 and the second system unit U2 are electrically connected through the connection connector 70, the CPUs 3A and 3B on one main board 6 use the data of the DIMM 4 on the other main board 6. can do.

  The position of the connection connector 70 provided on the bottom surface of the second system unit U2 is the same as the position of the sleeve 8S in the water leakage tray 8 attached to the main board 6 of the first system unit U1. In this case, the main board 6 of the first system unit U1 has a connector (fitting to a connection connector 70 provided on the bottom surface of the main board 6 of the second system unit U2 in the sleeve 8S of the leak tray 8. A pair connector) is mounted. Therefore, when the second system unit U2 is attached to the upper side of the first system unit U1, the connection connector 70 in the second system unit U2 is inserted into the sleeve 8S in the first system unit U1, Connected to the pair connector.

  FIG. 20 is a perspective view of a main part of the server module 1 showing a state in which the first and second system units U1 and U2 shown in FIG. 18 are overlapped, and illustration of the fan is omitted. As can be seen from this figure, the passage of the cooling air to the XB unit 71 is secured even in the state where the second system unit U2 is mounted on top of the first system unit U1. As shown in FIG. 18, the size of the fan 5 is large enough to send sufficient cooling air to the radiators 11 stacked in two stages.

  As described above, according to the present application, the liquid cooling system has the ability to dissipate a high calorific value, can be mounted on a predetermined device in high density in a small space, and can secure a wide mounting area for parts other than the cooling target. Can provide. Also, a liquid cooling system that secures high reliability and does not hinder cooling of components other than the cooling target by providing a redundant configuration and redundant control for the pump for transporting the refrigerant, and an electronic device mounted with the liquid cooling system are provided. Is possible.

  With the liquid cooling system of the present application, two 300 W CPUs can be cooled at a pump flow rate of 0.9 l / min when the radiator size is 36 mm high, 59 mm deep, and 350 mm wide. Further, since only the radiator exists in the cooling air path for cooling the DIMM, the cooling air efficiently hits the DIMM, and 256 W DIMMs (32 8 W DIMMs) can be cooled. In addition, if there is a notification of pump abnormality, it is no longer possible that two pumps will fail at the same time if replacement is performed in a short time after the occurrence of the abnormality, and a liquid cooling system failure may occur. Can be eliminated.

  The present application has been described in detail with particular reference to preferred embodiments thereof. For easy understanding of the present application, specific forms of the present application are appended below.

(Appendix 1) With fans
A circuit board located downstream of the cooling air generated by the fan and having a mounting surface parallel to the cooling air;
First and second regions that are partitioned on the mounting surface in a straight line along the direction of the cooling air and each mount a plurality of electronic components;
An electronic device comprising: a plurality of heat generating components mounted in the first region as the electronic components and cooled by a liquid refrigerant.
(Additional remark 2) The said 2nd area | region is arrange | positioned at the both sides of the said 1st area | region, The electronic device of Additional remark 1 characterized by the above-mentioned.
(Supplementary note 3) The electronic device according to Supplementary note 1 or 2, wherein a plurality of CPUs are mounted as the heat generating components, and a plurality of memories are mounted in the second region.
(Supplementary note 4) The electronic device according to Supplementary note 3, wherein the memories are arranged in a matrix.
(Supplementary note 5) The supplementary note 1 or 2, wherein the first heat-generating component and a second heat-generating component having a height different from that of the heat-generating component are mounted in the first region as the heat-generating component. Electronics.

(Additional remark 6) The radiator which is arrange | positioned in the downstream of the said fan, has the inflow part and outflow part of the said refrigerant | coolant, and cools the said refrigerant | coolant with the said cooling air,
A refrigerant pipe that circulates the refrigerant along a path that avoids the second region between the outflow part and the inflow part;
A heat receiving member that is provided in the middle of the refrigerant pipe and performs heat exchange between the refrigerant and the heat generating component;
A pump that is provided in the middle of the refrigerant pipe and moves the refrigerant;
The electronic device according to appendix 1 to appendix 5, wherein
(Appendix 7) A tank for temporarily storing the refrigerant is provided between the refrigerant pipe after being branched and the heat receiving member,
The electronic device according to appendix 6, wherein a plurality of the pumps are attached to each of the tanks.
(Additional remark 8) The said radiator is arrange | positioned with respect to the said cooling air in the downstream of the said fan, and the upstream of the said heat-emitting component, The electronic device of Additional remark 6 or 7 characterized by the above-mentioned.
(Supplementary Note 9) A base plate inserted in a gap between the substrate and the refrigerant pipe, and a wall that stands up in the vertical direction of the circuit board from the periphery of the base plate and surrounds the refrigerant pipe and the tank The electronic device according to any one of appendices 1 to 8, further comprising a water leakage tray having a portion.
(Additional remark 10) The said base part is provided with several opening, The said heat-emitting component is penetrated in the said opening, The electronic device of Additional remark 9 characterized by the above-mentioned.

(Additional remark 11) The said pump is attached to the side surface of the said tank in the state hold | maintained at the pump mounting bracket, The electronic device of Additional remark 7 characterized by the above-mentioned.
(Supplementary note 12) The electronic device according to Supplementary note 11, wherein a buffer plate is attached between the pump and a pump mounting bracket.
(Supplementary note 13) Any one of Supplementary notes 6 to 12, wherein the heat receiving member includes a cold plate for the first heat-generating component and a cold plate for the second heat-generating component in the first region. The electronic device as described in.
(Additional remark 14) The said heat receiving member is equipped with the sheet metal, and this sheet metal contacts the 1st sheet metal part which contacts the cold plate for said 1st heat generating components, and the cold plate for said 2nd heat generating components. The electronic apparatus according to appendix 13, comprising a second sheet metal part.
(Supplementary note 15) The electronic device according to any one of supplementary notes 1 to 14, wherein the plurality of circuit boards are stacked in a direction perpendicular to the mounting surface and electrically connected to each other.

(Supplementary Note 16) A connection mechanism for connecting to another electronic device stacked in the vertical direction is provided on a back surface portion near one side surface of the electronic device, and the circuit board is cooled in the connection mechanism. The electronic device according to any one of appendices 1 to 15, wherein the electronic device is offset to the other side surface and disposed in the housing of the electronic device in order to secure a ventilation path for sending cooling air to the necessary parts. machine.
(Supplementary note 17) The electronic device according to supplementary note 15 or 16, wherein a connector that electrically connects the plurality of circuit boards to each other is disposed in a space between the plurality of strong cooling components.
(Supplementary Note 18) A radiator having an inflow portion and an outflow portion for the refrigerant, and cooling the refrigerant with cooling air;
A cold water pipe extending on a straight line along the direction of the cooling air from the outflow part;
Adjacent to the cold water pipe in a direction perpendicular to the direction of the cooling air, arranged along the direction of the cooling air, and connected to the cold water pipe in parallel to each other, heat is generated between the heat generating component and the refrigerant. A plurality of heat receiving parts to be exchanged;
A cooling module comprising: a hot water pipe connected to the heat receiving portion, extending along the direction of the cooling air, and flowing the refrigerant that has passed through the heat receiving portion to the inflow portion.
(Supplementary note 19) A plurality of tanks for storing the refrigerant are provided on the refrigerant path between the cold water pipe and the plurality of heat receiving units, and the tanks are disposed on the heat receiving units. The cooling module according to appendix 18.
(Supplementary note 20) The cooling module according to supplementary note 19, wherein a plurality of pumps for moving the refrigerant are attached to each of the plurality of tanks.

1 Server module (electronic equipment)
3 Heat-generating parts (CPU, parts that require strong cooling)
4 Electronic components (memory, DIMM)
6 Main board 7 Wind barrier 8 Leak tray 10 Liquid cooling system (cooling module)
11 Radiator 12 Heat receiving member (cooling jacket)
13 Refrigerant piping 14 Pump 15 Tank 16 Manifold 30 Power supply part for CPU 40 Sheet metal 50 Pump support mechanism 55 Pump mounting bracket (bracket)
60 Sheet metal for CPU 70 Connector 71 Connection unit (XB unit)
90 Cold plate 93 CPU cold plate 95 CPU power cold plate

Claims (6)

With fans,
A circuit board located downstream of the cooling air generated by the fan and having a mounting surface parallel to the cooling air;
A plurality of processors mounted on the circuit board and disposed along the direction of the cooling air;
A plurality of memories mounted on the circuit board and cooled by the cooling air;
A radiator mounted on the circuit board, disposed on the downstream side of the fan, and for cooling the liquid refrigerant by the cooling air;
A plurality of heat receiving members mounted on the circuit board and performing heat exchange between the liquid refrigerant cooled by the radiator and the processor;
A refrigerant pipe mounted on the circuit board and allowing the liquid refrigerant to flow between the radiator and the plurality of heat receiving members ;
The circuit board includes: a first area in which the plurality of processors are mounted in areas along the direction of the cooling air; a second area in which the plurality of memories are mounted and on both sides of the first area;
Have
Among the plurality of processors, a part of the plurality of memories is arranged on both sides of each processor, and the one processor and the part of the plurality of memories arranged on both sides of the one processor are arranged. and the memory is wired,
The refrigerant pipe is disposed on the first region along the direction of the cooling air, and branches in parallel to the plurality of heat receiving members,
The plurality of heat receiving members are disposed in the first region,
The radiator has an inflow portion into which the liquid refrigerant flows and an outflow portion from which the liquid refrigerant flows out,
The refrigerant pipe is divided into two upper and lower stages, the liquid medium cooled by the radiator flows through one refrigerant pipe, and the liquid medium heat-exchanged by the plurality of heat receiving members flows through the other refrigerant pipe .
An electronic device characterized by that. Provided in the middle of the refrigerant pipe, an electronic device according to claim 1, wherein the pump for moving the liquid refrigerant, further comprising. A tank for temporarily storing the liquid refrigerant is provided between the refrigerant pipe after being branched and the plurality of heat receiving members,
The electronic device according to claim 2 , wherein a plurality of the pumps are attached to each of the tanks. A base plate that is inserted into a gap between the circuit board and the refrigerant pipe, and a wall that stands up from the periphery of the base board in the vertical direction of the circuit board and surrounds the refrigerant pipe and the tank. The electronic device according to claim 3 , further comprising a water leakage tray. The electronic device according to claim 1, any one of 4, wherein a plurality of said circuit board are connected electrically to each other are stacked in a direction perpendicular to the mounting surface. The electronic apparatus according to claim 5 , wherein a connector that electrically connects the plurality of circuit boards to each other is disposed in a space between the plurality of circuit boards.

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