Heat pipe

• US 4,523,636 A
• Filed: 09/20/1982
• Issued: 06/18/1985
• Est. Priority Date: 09/20/1982
• Status: Expired due to Term

• Current Assignee: STM Power, Inc.
• Original Assignee: Stirling Thermal Motors Incorporated
• Inventors: Ziph, Benjamin, Meijer, Roelf J.
• Primary Examiner(s): Davis, Jr., Albert W.
• Application Number:
  US06/420,047
• Time in Patent Office: 1,002 Days
• Field of Search: 165/104.26, 165/DIG. 9, 122/366
• US Class Current: 165/104.26
• 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 15/0266 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 15/046 characterised by the material or the construction of the capillary structure
• CPC Class Codes: F28D 2021/0024 for combustion apparatus, e.g. for boilers
• CPC Class Codes: F28F 2215/06 Hollow fins; fins with internal circuits
• CPC Class Codes: F28F 2225/04 for conduits
• CPC Class Codes: Y10S 165/906 Reinforcement

Abstract

An improved heat pipe comprising a duct having disposed at opposite ends thereof an evaporator with wick-lined hollow fins in the form of extended corrugations thereon, and operable to supply heat to the evaporator comprised of a gas combustor having an internal volume for containing the evaporator and combustion air for supply to a combustion chamber located therein; a wick capable of transporting liquid by capillary action lining substantially all internal surfaces of said heat pipe; an external heat sink operable to remove heat from the condenser; and a heat transport medium contained by said heat pipe. The evaporator is further comprised of a coarse porous material lining and completely filling the spaces within the hollow fins open to the evaporator for increased structural stiffness and ease of fabrication; and a porous mass completely filling the evaporator for increased compressive strength. The coarse porous material and the porous mass are sufficiently porous to allow vapor to flow through each with a minimum of obstruction.

Claims

1. A heat pipe including a duct having at opposing ends an evaporator and a condenser;

a wick capable of transporting liquid with capillary action lining internal surfaces of said duct; and

a heat transport medium contained by said duct for transporting heat between said evaporator and said condenser, wherein the improvement comprises;

a plurality of hollow fins lined with said wick and with a lining of coarse porous material capable of supporting compressive load thereby increasing structural stiffness of said fins with the inside width of said hollow fin being defined by twice the thickness of the coarse porous material added to twice the wick thickness and located at the evaporator end of said duct in fluid communication with the interior of said duct, said fins having substantially flat parallel sides and being arranged in a generally parallel spaced relation with each other to enable heating of the interiors of said fins from a heat source passing heat through and by said flat sides thereof, and the spaces within said hollow fins being open to said duct to allow liquid and vaporous forms of said heat transfer medium to communicate therebetween.

2. Apparatus according to claim 1, wherein each said hollow fin has substantially parallel sides extending perpendicularly outward from said evaporator, said parallel sides having base ends rigidly attached to said evaporator and top ends;

and a top surface connecting the top ends of said parallel sides.

3. Apparatus according to claim 2, wherein said wick is comprised of a fine porous material such as stainless steel gauze.

4. Apparatus according to claim 3, wherein the coarse porous material is comprised of stainless steel gauze.

5. Apparatus according to claim 4, wherein said evaporator includes walls forming a chamber in fluid communication with said hollow fins and said duct, and reinforcing means in said chamber reinforcing said walls and increasing the structural stiffness of said evaporator.

6. Apparatus according to claim 5, wherein said means for increasing structural stiffness of said evaporator is comprised of coarse gauze.

7. Apparatus according to claim 5, wherein said means for increasing structural stiffness of said evaporator is comprised of structural members.