Abstract: A shutter structure includes a rotary shaft, a shutter plate, an upper rib and at least one lower rib. The rotary shaft is provided in a cylindrical duct line. The shutter plate rotates about the rotary shaft and switches between an open state and a closed state. The shutter plate has a peripheral edge portion, a curved portion, and a shutter plate shaft portion. The peripheral edge portion includes an upper shielding plate and two lower shielding plates. The lower shielding plates are located symmetrically to each other with respect to a center line. The center line is perpendicular to the shutter plate shaft portion. When the shutter plate is in the closed state, the upper shielding plate comes into contact with the upper rib from an upstream side, and the lower shielding plates come into contact with the at least one lower rib from a downstream side.

Abstract: Shutter structure includes rotary shaft provided in duct line, shutter plate rotated about the rotary shaft and disposed to switch between open state and a closed state, and upper rib and lower rib provided on an inner wall of duct line. Shutter plate has a peripheral edge portion constituted by an upper shielding plate and two lower shielding plates, a curved portion, and shutter plate shaft portion. The lower shielding plates are located at positions symmetrical to each other with respect to a center line perpendicular to the shutter plate shaft portion, and the upper shielding plate is located on the center line. When shutter plate is in the closed state, the upper shielding plate comes into contact with the upper rib from an upstream side, and the lower shielding plates come into contact with the lower rib from a downstream side.

Abstract: A cooling device for cooling a rack-type server of which a housing includes a plurality of electronic devices includes an interior cooling unit and an exterior cooling unit. The interior cooling unit includes a heat-receiving unit, a heat dissipation unit, an outward path pipe, and a return path pipe. The interior cooling unit allows working fluid to be circulated through the heat-receiving unit, the outward path pipe, the heat dissipation unit, the return path pipe, and the heat-receiving unit to thereby move the heat from the heat-receiving unit to the heat dissipation unit. The exterior cooling unit has a heat exchange unit abutted on the heat dissipation unit and allows, by a circulated cooling medium, the heat of the working fluid discharged from the heat dissipation unit to be dissipated to external air.

Abstract: In cooling device, refrigerant is circulated through heat receiving unit, heat radiation passage, heat radiation unit, return passage, and heat receiving unit, and cooling is performed by making use of a phase change between a liquid phase and a gaseous phase of refrigerant. Heat receiving unit is configured by placing in series a plurality of heat receivers each of which has inflow port and an outflow port. Check valve is provided on an inflow port side of heat receiver which is closest to return passage among the plurality of heat receivers.

Abstract: A cooling device for cooling a rack-type server of which a housing includes a plurality of electronic devices includes an interior cooling unit and an exterior cooling unit. The interior cooling unit includes a heat-receiving unit, a heat dissipation unit, an outward path pipe, and a return path pipe. The interior cooling unit allows working fluid to be circulated through the heat-receiving unit, the outward path pipe, the heat dissipation unit, the return path pipe, and the heat-receiving unit to thereby move the heat from the heat-receiving unit to the heat dissipation unit. The exterior cooling unit has a heat exchange unit abutted on the heat dissipation unit and allows, by a circulated cooling medium, the heat of the working fluid discharged from the heat dissipation unit to be dissipated to external air.

Abstract: A cooling apparatus includes: a heat receiving portion including a heat receiving plate which transfers heat from a heat source to a working fluid; a heat radiating portion which discharges the heat of the working fluid; and a heat radiating path and a return path which connect the heat receiving portion and the heat radiating portion to each other. In the cooling apparatus, the working fluid is circulated through the heat receiving portion, the heat radiating path, the heat radiating portion, the return path and the heat receiving portion to dissipate the heat of the heat source. A check valve which controls a flow of the working fluid is provided in the return path at a location near the heat receiving portion or provided in the heat receiving portion.