Electronic device for liquid immersion cooling and cooling system using the same

1. An electronic device that is immersed in a coolant filled in a cooling apparatus, and directly cooled, the electronic device being configured to be housed in each of a plurality of housing parts of the cooling apparatus, the electronic device comprising:

a metal board held with a pair of board retainers disposed in the housing part;

one or more substrate groups attached to a first surface of the metal board and a second surface opposite the first surface; and

a plurality of slots disposed above the one or more substrate groups, and arranged onto the metal board in parallel, each of which allows a power unit to be housed, wherein:

the substrate group includes a plurality of first circuit boards, each including a plurality of sockets for mounting a plurality of processors and a main memory on one surface of a substrate, and a component for interconnecting the processors, a second circuit board including a mother board component which includes at least a chipset for controlling the main memory, but does not include the sockets for mounting the processors and the main memory, and the component for interconnecting the processors, a third circuit board including a plurality of network controller chips and a plurality of network cable sockets corresponding to the respective first circuit boards, a first connector for electrically connecting between the first circuit boards and the second circuit board, a second connector for electrically connecting between the second circuit board and the third circuit board, and a flow channel formed in a gap between a surface opposite the one surface of the one or more first circuit boards, and one surface of the second circuit board, which faces the surface opposite the one surface of the one or more first circuit boards, and

the third circuit board is disposed so that the slots are interposed between the third circuit board and the metal board, and the network cable sockets are arranged in parallel on one side of the third circuit board, located at an opening side of the slots.

2. An electronic device that is immersed in a coolant filled in a cooling apparatus, and directly cooled, the electronic device being configured to be housed in each of a plurality of housing parts of the cooling apparatus, the cooling apparatus including a cooling tank with an open space defined by a bottom wall and side walls, a plurality of arranged housing parts formed by dividing the open space using a plurality of internal partition walls in the cooling tank, and an inflow opening and an outflow opening for the coolant, the inflow opening being formed in a bottom part or a side surface of each of the housing parts, and the outflow opening being formed around a surface of the coolant circulating in the respective housing parts, wherein:

the electronic device includes a metal board held with a pair of board retainers disposed in the housing part, one or more substrate groups attached to a first surface of the metal board and a second surface opposite the first surface, and a plurality of slots disposed above the one or more substrate groups, and arranged onto the metal board in parallel, each of which allows a power unit to be housed;

the substrate group includes a plurality of first circuit boards, each including a plurality of sockets for mounting a plurality of processors and a main memory on one surface of a substrate, and a component for interconnecting the processors, a second circuit board including a mother board component which includes at least a chipset for controlling the main memory, but does not include the sockets for mounting the processors and the main memory, and the component for interconnecting the processors, a third circuit board including a plurality of network controller chips and a plurality of network cable sockets corresponding to the respective first circuit boards, a first connector for electrically connecting between each of the first circuit boards and the second circuit board, a second connector for electrically connecting between the second circuit board and the third circuit board, and a flow channel formed in a gap between a surface opposite the one surface of the one or more first circuit boards, and one surface of the second circuit board, which faces the surface opposite the one surface of the one or more first circuit boards, and

the third circuit board is disposed so that the slots are interposed between the third circuit board and the metal board, and the network cable sockets are arranged in parallel on one side of the third circuit board, located at an opening side of the slots.

3. The electronic device according to claim 1 , further comprising a plurality of spacers for holding the gap, and a plurality of screws, wherein each of the screws pierces through the first circuit board, the second circuit board, and the respective spacers for fastening.

4. The electronic device according to claim 1 , wherein an external shape of a connected body formed by attaching the one or more substrate groups respectively to the first and the second surfaces of the metal board is similar to an internal shape of each of the housing parts.

5. The electronic device according to claim 4 , wherein the connected body has a rectangular parallelpiped external shape.

6. The electronic device according to claim 2 , further comprising a plurality of spacers for holding the gap, and a plurality of screws, wherein each of the screws pierces through the first circuit board, the second circuit board, and the respective spacers for fastening.

7. The electronic device according to claim 2 , wherein an external shape of a connected body formed by attaching the one or more substrate groups respectively to the first and the second surfaces of the metal board is similar to an internal shape of each of the housing parts.

8. The electronic device according to claim 7 , wherein the connected body has a rectangular parallelpiped external shape.