摘要:
A cooling system for cooling a CPU 200 mounted on a printed circuit board 100 within a housing thereof, has a heat-receiving jacket 310, being thermally connected with a surface of the CPU generating heat therein, and for evaporating liquid refrigerant stored in a pressure-reduced inner space with heat generation thereof. A condenser 320 receives refrigerant vapor from the heat-receiving jacket for condensing the refrigerant vapor into a liquid by transferring the heat into an outside of the apparatus. A thermo siphon is used for circulating the refrigerant due to phase change thereof, and the condenser has fine grooves on an inner wall surface thereof along a direction of flow of the refrigerant, and is also formed flat in a cross-section thereof, for cooling the refrigerant vapor from the heat-receiving jacket on the inner wall surface thereof, efficiently.
摘要:
There is disclosed a liquid-cooled electronic device. Semiconductor devices are mounted on a substrate of a semiconductor module immersed in a cooling liquid. A wire-like member is provided in the vicinity of a cooling medium ejection port of each cooling medium supply member which cools a respective one of the semiconductor devices by a jet of the cooling liquid. With this arrangement, the flow of the cooling liquid downstream of the wire-like member is disturbed to promote the boiling over the entire surface of the semiconductor device, and when the semiconductor device is to be cooled, a transient temperature rise is reduced at the time of starting the energization of the semiconductor device, thereby stabilizing the temperature of the semiconductor device.
摘要:
An apparatus for cooling semiconductor devices includes a module for cooling semiconductor devices; a refrigerant cooling device for receiving via an outlet pipe the refrigerant discharged through an outlet port of the module to cool the refrigerant; a refrigerant circulation pump for receiving, via a suction pipe, the refrigerant cooled by the refrigerant cooling device and sending the refrigerant to the module via an inlet pipe; and a refrigerant-flow stabilizing mechanism for stabilizing a refrigerant circulation flow discharged from the refrigerant circulation pump to be returned to the refrigerant circulation pump via the module and the refrigerant cooling device. Since the refrigerant-flow stabilizing mechanism stabilize the refrigerant flow, the refrigerant flow can be stably circulated so that the semiconductor devices in the module are stably cooled.
摘要:
A semiconductor cooling unit for directly jetting a cooling medium against surfaces of semiconductor devices for use in a high-speed computer or the like to effectively remove heat from the semiconductor devices, in which partition members for partitioning a space into regions where semiconductor devices are placed. Each partitioned region has an opening at its ceiling side, and a pipe for supplying or discharging the cooling medium through the opening is disposed so as to project toward a central portion of the back surface of each semiconductor device. This pipe is utilized to also section a cooling medium supply header or a cooling medium return header so that bubbles generated from the semiconductor device surfaces can be smoothly removed, and so that the cooling medium can flow smoothly onto the semiconductor devices.
摘要:
Semiconductor devices are fixed on a substrate by solder and a semiconductor module having an enclosed structure is formed by the substrate, flanges and a housing. Two groups of heat conducting members, each having fins respectively in contract with the semiconductor devices and an inner wall of the housing are attached to the semiconductors. A fin thickness of each fin of the two groups of heat conducting members is comparatively thick, a fin height is low and the respective fins of the respective opposed heat conducting members have with very small clearances therebetween. A liquid as a heat conducting medium is enclosed in the semiconductor module. The liquid level of the semiconductor module is controlled such that it contacts a uppermost semiconductor device in the semiconductor module in a vertical arrangement. Further, valve mechanisms for introducing and removing a cooling fluid are provided at a top face and a bottom face of a space formed in the semiconductor module. The mass production capability of the heat conducting members is improved by providing such highly rigid fins, and improved cooling function is provided by firmly introducing the cooling medium to the respective fins while permitting the module to be reduced in size.
摘要:
Provided is an air heat exchanger capable of preventing an increase in ventilation resistance and a decrease in heat exchange efficiency due to condensation water generated on surfaces of heat transfer fins, without increasing thermal resistance of flat tubes and the heat transfer fins, and preventing scattering of water droplets downwind from the heat transfer fins. In the air heat exchanger including a plurality of flat tubes 2 and heat transfer fins 5 provided between the flat tubes 2 and on which air is blown, the flat tubes 2 include water draining grooves 4 on side surfaces on which the heat transfer fins 5 are provided and the heat transfer fins 5 include water guiding grooves 6 communicating with the water draining grooves 4. At least a groove wall 40 on the upwind side of an air blowing direction 10 among groove walls forming the water guiding grooves 6 is provided from a position of the upwind side from the water draining grooves 4 to the water draining grooves 4. The water guiding grooves 6 extend toward the water draining grooves 4 along the groove wall 40 on the upwind side and an area of a cross section perpendicular to an extension direction decreases toward the water draining grooves 4.
摘要:
An object of the present invention relates to provide a method for forming a multi-layered coating film including a step of baking and curing an uncured intermediate coating film, an uncured base coating film and an uncured clear coating film at the same time which can give a multi-layered coating film excellent in gloss and in appearance, and to provide a multi-layered coating film obtained thereof.The present invention provides to a method for forming a multi-layered coating film in three-coat and one-bake coating method, using a solvent-borne intermediate coating composition containing an urethane-modified polyester resin (a) having a water tolerance value of 4 to 10 ml, a melamine resin (b) having a hexane tolerance value of 8 to 40 ml, a blocked isocyanate compound (c) and a nonaqueous dispersion resin (d), and a water-borne base coating composition containing an emulsion resin and a pigment.
摘要:
Disclosed is a solvent-borne metallic base coating composition which comprises (A) an urea-contained acrylic resin, (B) a urethane-modified polyester resin, (C) a curing agent and (D) a luster pigment, wherein a solid weight ratio of the urea-contained acrylic resin (A)/the urethane-modified polyester resin (B) is within the range of from 60/40 to 95/5. The resin coating composition can form metallic coatings having high color phase difference between looking at high light position and looking at shade position, in particular those having high FF property, excellent appearance (surface texture) and transparency. (92 words)
摘要:
The present invention provides a curable resin composition having good curability and storage stability, which provides a cured film having excellent weather resistance, acid resistance and mar resistance. The curable resin composition comprises:(a) 20 to 80% by weight of a polycarboxylic acid having an acid value of 25 to 300 mg KOH/g based on solid and a number average molecular weight of 500 to 20000; and(b) 20 to 80% by weight of a polyepoxide having an epoxy equivalent of 100 to 800 and a number average molecular weight of 500 to 20000, prepared by copolymerizing: (1) 10 to 60% by weight of a long-chain epoxy monomer; and (2) 40 to 90% by weight of an ethylenically unsaturated monomer having no epoxy group. The present invention also provides a process for forming a cured film using the resin composition.
摘要:
The present invention relates to a flavor composition or fragrance composition which can satisfy diversified requirements for flavored products, as well as to a flavor-improving agent which can improve the quality and release of aroma of a beverage or food. More particularly, the present invention relates to a flavor composition or fragrance composition which comprises an optically active S-alkyl 2-methylbutanethioate as an active ingredient, a flavor- or fragrance-added product, a flavor-improving agent which comprises an optically active S-alkyl 2-methylbutanethioate as an active ingredient, and a beverage or food having an improved flavor. The optically active S-alkyl 2-methylbutanethioate includes S-alkyl(R)-2-methylbutanethioate and S-alkyl(S)-2-methylbutanethioate.