Liquid immersion cooler

• US 9,936,606 B1
• Filed: 04/06/2017
• Issued: 04/03/2018
• Est. Priority Date: 01/30/2017
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kosugi, Naofumi, Yamamoto, Takashi
• Primary Examiner(s): Haughton, Anthony
• Assistant Examiner(s): Gafur, Razmeen
• Application Number:
  US15/480,430
• Time in Patent Office: 362 Days
• Field of Search: 361676-678, 36167946-67954, 361688-723, 165 801- 805, 16510433, 165185, 174 151- 153, 174 161- 163, 174547, 174548, 257712-722, 257E23088, 24453, 24458-459, 454184, 312236
• CPC Class Codes: C09K 5/041 for compression-type refrigeration systems
• CPC Class Codes: H05K 7/20236 by immersion
• CPC Class Codes: H05K 7/20272 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

Abstract

A liquid immersion cooler including: a refrigerant tank that stores a silicone oil-based insulating refrigerant immersing an electronic device; a circulation passage that is provided between the refrigerant tank and a refrigerant cooler, and through which the silicone oil-based insulating refrigerant flows; and a pump that is arranged on the circulation passage, and circulates the silicone oil-based insulating refrigerant between the refrigerant tank and the refrigerant cooler.

Claims

1. A liquid immersion cooler comprising:

a refrigerant tank that stores a silicone oil-based insulating refrigerant immersing an electronic device;

a circulation passage that is provided between the refrigerant tank and a refrigerant cooler, and through which the silicone oil-based insulating refrigerant is circulated; and

a pump that is arranged on the circulation passage, and circulates the silicone oil-based insulating refrigerant between the refrigerant tank and the refrigerant cooler,

a first ratio of change of a first eye pattern of a waveform in case of being transmitted in the electronic device immersed in the silicone oil-based insulating refrigerant to a second eye pattern of a waveform in case of being transmitted in the electronic device located in air is within a prescribed range.

2. The liquid immersion cooler as claimed in claim 1, wherein the silicone oil-based insulating refrigerant is circulated in a state where a temperature of the silicone oil-based insulating refrigerant is equal to or more than 0°

C. and a flow rate of the silicone oil-based insulating refrigerant is equal to or more than 86 liter/minute.

3. The liquid immersion cooler as claimed in claim 1, wherein a flash point of the silicone oil-based insulating refrigerant is equal to or more than 250°

C.

4. The liquid immersion cooler as claimed in claim 1, wherein the prescribed range is equal to or less than 5%.

5. The liquid immersion cooler as claimed in claim 1, wherein the silicone oil-based insulating refrigerant is selected based on the first ratio of change and a second ratio of change of a third eye pattern of a waveform in case of being transmitted in the electronic device immersed in vegetable oil to the second eye pattern in air.