Fujitsu Corporation

Susumu Ogata

Hiroki Uchida

Seiji Hibino

Takeshi Shioga

Shigenori Aoki

Takahiro Kimura

Jun Taniguchi

Hideaki Nagaoka

A loop heat pipe includes an evaporator to cause a liquid-phase working fluid to be vaporized by heat from a heat source; a condenser to condense the vaporized working fluid; a circulation path including a liquid line and a vapor line to connect the condenser and the evaporator in a loop; a tank provided on the liquid line and configured to accommodate the liquid-phase working fluid; a connecting line to connect the tank and the evaporator to supply the liquid-phase working fluid to the evaporator; and a bypass line positioned over the connecting line in a direction of gravity and connecting the evaporator and the tank, the bypass line being configured to discharge a vapor bubble produced in the evaporator during operation of the loop heat pipe to the tank.

Loop heat pipe and electronic equipment using the same

A cooling device which is provided with an evaporator with a built-in wick, a condenser, and a loop type heat pipe which connects the evaporator and condenser in a loop and is provided with a liquid pipe and vapor pipe, wherein the evaporator is divided into a liquid-pipe-side case and a vapor-pipe-side case and wherein a plurality of discharge ports of working fluids and a wick in which the working fluid from the discharge ports is completely permeated are arranged between the two cases. The wick is provided with projecting parts which have recessed parts corresponding to the discharge ports, while the outer circumferential surfaces of the projecting parts are provided with grooves. The working fluid which permeates the wick is changed to a vapor inside the vapor-pipe-side case, collects in the evaporation chamber, and is discharged to the liquid pipe, and thus, dry out of the wick is prevented.

Cooling device using loop type heat pipe

A loop heat pipe system includes a loop heat pipe (LHP), a temperature sensor, a heater and a controller. The temperature sensor measures temperature of a working fluid portion of the LHP in which the working fluid has different phases depending on whether or not the LHP is in a disable status not to start up a heat transportation, in which a liquid phase of the working fluid does not exist in an evaporator of the LHP. The heater heats a heating target part of a vapor line. The controller, in order to start up the LHP, turns on the heater, monitors temperature of the heating target part using the temperature sensor, and turns off the heater when detecting a change in the monitored temperature, caused by condensation of a vapor phase of the working fluid.

Loop heat pipe system and information processing apparatus

There is provided a loop heat pipe which includes an evaporator that internally includes at least one wick built, a condenser, a liquid pipe and a vapor pipe that connect the evaporator and the condenser to each other, and a heat dispersion cavity that is formed inside the evaporator, and disperses a vapor, wherein the wick includes, a first wick that is porous, a second wick that is porous, the second wick being inserted into the first wick from the liquid pipe side and including a pore size larger than the first wick, and a vapor channel that is defined between the first wick and the second wick. The vapor channel is connected at an end on the liquid pipe side to the heat dispersion cavity.

Loop heat pipe, and electronic apparatus including loop heat pipe

A loop heat pipe includes: an evaporator to convert liquid phase working fluid into vapor phase working fluid; a condenser to convert vapor phase working fluid into liquid phase working fluid; a first vapor line and a first liquid line to allow the evaporator to communicate with the condenser and form a circular main loop; and a second vapor line and a second liquid line to allow the evaporator to communicate with the condenser and form a circular auxiliary loop; wherein the evaporator includes a reservoir that temporarily stores the liquid phase working fluid, a first vapor collector that communicates with the first vapor line, a second vapor collector that communicates with the second vapor line, first wick disposed between the reservoir and the first vapor collector, and second wick disposed between the reservoir and the second vapor collector.

Growing community of inventors

Isehara, Japan

Susumu Ogata