| 摘要 |
PURPOSE:To increase the heat transferring efficiency both at the time of condensation and at the time of boiling, by molding primary and secondary spiral channels crossing to each other on the inside wall of a heat pipe, by making the secondary spiral channels shallower than the primary spiral channels, by making the crossing pars of both spiral channels the same in depth as the secondary spiral channels, and by molding cavities on the bottoms of the crossing parts which connect the bottoms of the primary spiral channels. CONSTITUTION:Primary spiral channels 2, and secondary spiral channels 3 which cross the primary ones are molded on the inside wall of a specially formed heat transfer pipe 1. The depth 'H2' of the spiral channels 3 is formed shallower than the depth 'H1' of the spiral channel 2. An extrusion is formed in the spiral channel 2, as a thread 2a between the spiral channels 2 is partially crushed when the spiral channels 3 are molded at the crossed part 4 of spiral channels 2 and 3. The bottom of the crossed part 4 is connected to the bottom of a spiral channel 3 by the extruded part 5, being formed at the same depth. A cavity 6 which pierces through the bottom of a spiral channel 2 is formed under the extruded part 5, that is the bottom wall of a crossed part 4. The heat transferring capacity at the time of condensation is increased by cutting the continued threads between the spiral channels 2 by the spiral channels 3. While the heat transferring capacity at the time of boiling is increased by the cavities 6. |
