Liquid immersion cooling device and information processing apparatus

Patent metadata

Field	Value
Publication number	US-11064631-B2
Application number	US-201816018465-A
Country	US
Kind code	B2
Filing date	Jun 26, 2018
Priority date	Jul 5, 2017
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

A liquid immersion cooling device for information processing apparatuses. The liquid immersion cooling device includes an immersion tank, a refrigerant liquid that is retained in the immersion tank, and a plurality of fillers that are filled in the immersion tank and that float on a surface of the refrigerant liquid to cover the surface of the refrigerant liquid.

First claim

What is claimed is:

1. A liquid immersion cooling device comprising:
an immersion tank;
a refrigerant liquid that is retained in the immersion tank; and
a plurality of fillers that are filled in the immersion tank and that float on a surface of the refrigerant liquid to cover the surface of the refrigerant liquid,
the immersion tank includes
a first tank of a closed type that has a top wall,
a second tank that is laterally adjacent to the first tank,
a closed gas space that couples a liquid surface of the refrigerant liquid in the first tank to a first region of a liquid surface of the refrigerant liquid in the second tank, and
an opening that exposes a second region of the liquid surface of the refrigerant liquid in the second tank to an atmospheric space,
the plurality of fillers are filled in the opening and float in the second region to cover the second region.

2. The liquid immersion cooling device according to claim 1 , wherein the second tank includes
an upper wall and a lower wall, and
a partition wall that extends toward the lower wall from the upper wall,
wherein a gas passage located within the gas space is disposed between a bulkhead and the upper wall, the bulkhead being disposed between the first tank and the second tank,
wherein a refrigerant liquid passage located within the refrigerant liquid in the second tank is disposed between the lower wall and the partition wall, and
wherein the second tank has the opening at an opposite side from the bulkhead relative to the partition wall.

3. The liquid immersion cooling device according to claim 2 , wherein the opening is located at a position higher than the gas passage.

4. The liquid immersion cooling device according to claim 1 , wherein the second region has a surface area smaller than a surface area of the liquid surface of the refrigerant liquid in the first tank.

5. The liquid immersion cooling device according to claim 1 , further comprising:
a circulation mechanism that is coupled to the first tank and that causes the refrigerant liquid to circulate to and from the first tank to cool the refrigerant liquid.

6. The liquid immersion cooling device according to claim 1 , wherein the refrigerant liquid includes
a first refrigerant liquid retained in the first tank, and
a second refrigerant liquid retained in the second tank, and
wherein the first refrigerant liquid and the second refrigerant liquid are a same liquid.

7. The liquid immersion cooling device according to claim 1 , wherein each of the fillers is formed of a resin foamed material.

8. The liquid immersion cooling device according to claim 1 , wherein each of the fillers has lower density than the refrigerant liquid.

9. The liquid immersion cooling device according to claim 1 , wherein the fillers have low absorbability against the refrigerant liquid.

10. The liquid immersion cooling device according to claim 1 , wherein the refrigerant liquid is a fluorine-based inert fluid.

11. An information processing apparatus comprising:
an immersion tank;
a refrigerant liquid retained in the immersion tank;
a plurality of fillers that are filled in the immersion tank and that float on a surface of the refrigerant liquid to cover the surface of the refrigerant liquid; and
an electronic device immersed in the refrigerant liquid,
the immersion tank includes
a first tank of a closed type that has a top wall,
a second tank that is laterally adjacent to the first tank,
a closed gas space that couples a liquid surface of the refrigerant liquid in the first tank to a first region of a liquid surface of the refrigerant liquid in the second tank, and
an opening that exposes a second region of the liquid surface of the refrigerant liquid in the second tank to an atmospheric space,
the plurality of fillers are filled in the opening and float in the second region to cover the second region.

Assignees

• Fujitsu Ltd

Inventors

• So Tsuyoshi
• Kubo Hideo
• Watanabe Masayuki
• Fujiwara Shinnosuke

Classifications

• H05K7/203 Primary

  by immersion · CPC title

• H05K7/20809

  within server blades for removing heat from heat source · CPC title

• H05K7/20272

  Accessories for moving fluid, for expanding fluid, for connecting fluid conduits, for distributing fluid, for removing gas or for preventing leakage, e.g. pumps, tanks or manifolds · CPC title

• H05K7/20236 Primary

  by immersion · CPC title