Cooling unit

• US 20080236797A1
• Filed: 12/28/2007
• Published: 10/02/2008
• Est. Priority Date: 09/03/1999
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Suzuki, Masumi, Hirano, Minoru, Miyazaki, Ryuuji
• Granted Patent: US 7,828,047 B2
• Time in Patent Office: Days
• US Class Current: 165/104.29
• CPC Class Codes: F28D 15/0266 with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers F28D15/043 takes precedence
• CPC Class Codes: H01L 23/427 Cooling by change of state, e.g. use of heat pipes by liquefied gas H01L23/445
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

A cooling unit has a heat receiving unit that receives heat from a body radiating heat; a radiator disposed at a distance from the heat receiving unit and radiating recovered heat; a liquid coolant transporting heat generated at the heat receiving unit to the radiator; and a hollow tube disposed so that the liquid coolant circulates between the heat receiving unit and the radiator, a circulating flow of the liquid coolant formed by an elevating force of air bubbles generated from the heat received at the heat receiving unit, the radiator having an air pocket forming one part of the circulation path of the liquid coolant together with the hollow tube and capable of collecting the air bubbles.

Claims

1. A cooling unit comprising:

a heat receiving unit that receives heat from a body radiating heat;

a radiator unit disposed at a distance from the heat receiving unit and radiating recovered heat;

a liquid coolant transporting heat generated at the heat receiving unit to the radiator; and

a hollow tube disposed so that the liquid coolant circulates between the heat receiving unit and the radiator,

a circulating flow of the liquid coolant formed by an elevating force of air bubbles generated from the heat received at the heat receiving unit, the radiator having an air pocket forming one part of the circulation path of the liquid coolant together with the hollow tube and capable of collecting the air bubbles,

wherein the hollow tube has a bent portion inside of the heat receiving unit, the bent portion formed so as to expand a surface area contacting an inner surface of the heat receiving unit.

2. A cooling unit comprising:

a heat receiving unit that receives heat from a body radiating heat;

a radiator unit disposed at a distance from the heat receiving unit and radiating recovered heat;

a liquid coolant transporting heat generated at the heat receiving unit to the radiator; and

a hollow tube disposed so that the liquid coolant circulates between the heat receiving unit and the radiator,

a circulating flow of the liquid coolant formed by an elevating force of air bubbles generated from the heat received at the heat receiving unit, the radiator having an air pocket forming one part of the circulation path of the liquid coolant together with the hollow tube and capable of collecting the air bubbles,

wherein the heat receiving unit includes a heat sink forming one part of the circulation path of the liquid coolant together with the hollow tube and the radiator and capable of collecting a predetermined amount of the liquid coolant,

wherein two hollow tubes connect the heat sink and the radiator, one of the hollow tubes having a diameter larger than a diameter of the other hollow tube.

3. A cooling unit comprising:

a heat receiving unit that receives heat from a body radiating heat;

a radiator unit disposed at a distance from the heat receiving unit and radiating recovered heat;

a liquid coolant transporting heat generated at the heat receiving unit to the radiator; and

a hollow tube disposed so that the liquid coolant circulates between the heat receiving unit and the radiator,

a circulating flow of the liquid coolant formed by an elevating force of air bubbles generated from the heat received at the heat receiving unit, the radiator having an air pocket forming one part of the circulation path of the liquid coolant together with the hollow tube and capable of collecting the air bubbles,

wherein the heat receiving unit includes a heat sink forming one part of the circulation path of the liquid coolant together with the hollow tube and the radiator and capable of collecting a predetermined amount of the liquid coolant,

wherein two hollow tubes connect the heat sink and the radiator, one of the hollow tubes having a length shorter than a length of the other hollow tube.

4. A cooling unit comprising:

a heat receiving unit that receives heat from a body radiating heat;

a radiator unit disposed at a distance from the heat receiving unit and radiating recovered heat;

a liquid coolant transporting heat generated at the heat receiving unit to the radiator; and

a hollow tube disposed so that the liquid coolant circulates between the heat receiving unit and the radiator,

a circulating flow of the liquid coolant formed by an elevating force of air bubbles generated from the heat received at the heat receiving unit, the radiator having an air pocket forming one part of the circulation path of the liquid coolant together with the hollow tube and capable of collecting the air bubbles,

wherein the heat receiving unit includes a heat sink forming one part of the circulation path of the liquid coolant together with the hollow tube and the radiator and capable of collecting a predetermined amount of the liquid coolant,

wherein two hollow tubes connect the heat sink and the radiator, one of the hollow tubes disposed at a height higher than a height of the other hollow tube.

5. A cooling unit comprising:

a heat receiving unit that receives heat from a body radiating heat;

a radiator unit disposed at a distance from the heat receiving unit and radiating recovered heat;

a liquid coolant transporting heat generated at the heat receiving unit to the radiator; and

a hollow tube disposed so that the liquid coolant circulates between the heat receiving unit and the radiator,

a circulating flow of the liquid coolant formed by an elevating force of air bubbles generated from the heat received at the heat receiving unit, the radiator having an air pocket forming one part of the circulation path of the liquid coolant together with the hollow tube and capable of collecting the air bubbles,

wherein the heat receiving unit includes a heat sink forming one part of the circulation path of the liquid coolant together with the hollow tube and the radiator and capable of collecting a predetermined amount of the liquid coolant,

wherein an air bubble generation promoting member promoting air bubble generation is provided in the heat sink.

6. A cooling unit comprising:

a heat receiving unit that receives heat from a body radiating heat;

a radiator unit disposed at a distance from the heat receiving unit and radiating recovered heat;

a liquid coolant transporting heat generated at the heat receiving unit to the radiator; and

a hollow tube disposed so that the liquid coolant circulates between the heat receiving unit and the radiator,

a circulating flow of the liquid coolant formed by an elevating force of air bubbles generated from the heat received at the heat receiving unit, the radiator having an air pocket forming one part of the circulation path of the liquid coolant together with the hollow tube and capable of collecting the air bubbles,

wherein the heat receiving unit includes a heat sink forming one part of the circulation path of the liquid coolant together with the hollow tube and the radiator and capable of collecting a predetermined amount of the liquid coolant,

wherein a heat transmission promoting member promoting transmission of heat to the liquid coolant is provided in the heat sink.

7. A cooling unit comprising:

a heat receiving unit that receives heat from a body radiating heat;

a radiator unit disposed at a distance from the heat receiving unit and radiating recovered heat;

a liquid coolant transporting heat generated at the heat receiving unit to the radiator; and

a hollow tube disposed so that the liquid coolant circulates between the heat receiving unit and the radiator,

a circulating flow of the liquid coolant formed by an elevating force of air bubbles generated from the heat received at the heat receiving unit, the radiator having an air pocket forming one part of the circulation path of the liquid coolant together with the hollow tube and capable of collecting the air bubbles,

wherein the heat receiving unit includes a heat sink forming one part of the circulation path of the liquid coolant together with the hollow tube and the radiator and capable of collecting a predetermined amount of the liquid coolant,

wherein heat removing means for efficiently removing heat from the liquid coolant is provided inside the radiator.