Heat pipe and method and apparatus for fabricating same
US4020898A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 14, 1973 |
| Grant date | May 3, 1977 |
| Priority date | — |
| Expiry date | Feb 14, 1993 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF28F1/32
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A thermal transfer system comprising a closed, generally horizontally disposed tubular envelope having heat transfer fins mounted at axially spaced points along its outer surface is disclosed. The interior surface of the tubular envelope has a large number of small circumferentially extending capillary grooves characterized by a restricted opening relative to the base of the grooves. A liquid phase/vapor phase working fluid is contained within the envelope with the liquid phase normally comprising about 50 to about 75 percent of the volume of the envelope at normal operating temperatures. A liquid phase return tube rests on the bottom of the envelope and is open at both ends. The liquid phase return tube has an inside diameter of about 30 to about 40 percent of the inside diameter of the tubular envelope and has a length of between about 65 percent and about 85 percent of the length of the envelope. In the operation of the system, one end of the tubular envelope is normally at a relatively higher temperature compared to the other end. The working fluid is vaporized in the higher temperature end of the envelope and the vapor phase flows to the lower temperature end through the porti…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.