Heat pipe

• US 10,712,099 B2
• Filed: 07/06/2018
• Issued: 07/14/2020
• Est. Priority Date: 07/06/2017
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Energy Systems & Solutions Corporation (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Hoshino, Kunio, Kimura, Rei, Yamamoto, Yasushi, Fukuta, Masato, Mawatari, Takashi, Abe, Satoru
• Primary Examiner(s): Ruppert, Eric S
• Assistant Examiner(s): Weiland, Hans R
• Application Number:
  US16/028,968
• Publication Number:
  US 20190011196A1
• Time in Patent Office: 739 Days
• CPC Class Codes: F28D 15/0233 the conduits having a particular shape, e.g. non-circular cross-section, annular F28D15/0241, F28D15/0266 take precedence
• CPC Class Codes: F28D 15/025 having non-capillary condensate return means
• 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: F28D 15/06 Control arrangements therefor
• 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: H05K 7/20336 Heat pipes, e.g. wicks or capillary pumps

Abstract

A heat pipe, includes; an outer tube including first and second ends, the first end closed air tight; a box connected to the second end, a cross-sectional area of the box perpendicular to the outer tube central axis is larger than a cross-sectional area of the outer tube perpendicular to its axis; an inner tube positioned in the outer tube, a central axis of the inner tube parallel to the outer tube central axis, including third and fourth ends, the third end closer to the first end than the fourth end and open in the outer tube; a partition tube including fifth and sixth ends widening from the fifth end toward the sixth end, the fifth end connected with the fourth end, part of the sixth end connected on an inner surface of the box; and fluid in a space formed by the outer tube and the box.

Claims

1. A heat pipe, comprising;

an outer tube including a first end and a second end, the first end closed to be air tight;

a box connected to the second end of the outer tube, a cross-sectional area of the box perpendicular to the central axis of the outer tube is larger than a cross-sectional area of the outer tube perpendicular to its axis;

an inner tube positioned in the outer tube, a central axis of the inner tube parallel to the central axis of the outer tube, including a third end and a fourth end, the third end of the inner tube closer to the first end of the outer tube than the fourth end of the inner tube and open in the outer tube;

a partition tube including a fifth end and a sixth end and wider from the fifth end toward the sixth end, the fifth end of the partition tube connected with the fourth end to form a first opening, a part of the sixth end connected on an inner surface of the box and the other part of the sixth end not connected on the inner surface to form a second opening; and

a liquid working-fluid accommodated at a first end of the outer tube with the third end of the inner tube immersed, the liquid working-fluid absorbs heat and evaporates to be a gaseous working-fluid filled in a space formed by the second end of the outer tube and the box.

2. The heat pipe according to claim 1, further comprising

a cooling plate parallel to an inner surface of the partition tube.

3. The heat pipe according to claim 2, wherein

the cooling plate comprises a wire mesh.

4. The heat pipe according to claim 1, wherein

the inner tube includes a part that widens toward the third end.

5. The heat pipe according to claim 1, further comprising

a porous material in a second flow path between an inner surface of the outer tube and an outer surface of the inner tube.

6. The heat pipe according to claim 5, further comprising

a check valve in a first flow path in the inner tube, to block a flow of the fluid from the second flow path to the first flow path.

7. The heat pipe according to claim 6, wherein

the check valve includes a ball to close the first flow path by a buoyancy applied to the ball, the buoyancy generated by a flow of the fluid from the second flow path to the first flow path.