摘要:
Winding structure for static electrical induction apparatus such as transformers, reactors, or the like. A winding assembly is disposed in a space formed between a pair of inner and outer insulation continuous walls which are disposed in a container so as to commonly include the vertical axis of the container thereby defining the space therebetween. An inner vertical coolant passage is formed between the winding assembly and the inner insulation wall and an outer vertical coolant passage is also formed between the winding assembly and the inner insulation wall. The winding assembly is composed of a plurality of coil units stacked on one another in the vertical direction with separation at predetermined intervals so as to form horizontal coolant passages between vertically adjacent ones of the coil units, the inner and outer vertical coolant passages communicating with each other through the horizontal coolant passages.A plurality of coolant flow control members are disposed in discrete relation from one another in at least selected one of the inner and outer vertical coolant passages in a manner so that a horizontal sectional area of the selected vertical coolant passage is decreased periodically at a pitch of nP along the vertical direction where n represents an integer which is not smaller than two (2) and P represents a pitch of the coil units along the vertical direction.Further, each of the coil units may be divided into at least two, inner and outer, coil sub-units disposed concentrically with each other in a common horizontal plane to thereby additionally form an intermediate vertical coolant passage between the vertically stacked inner coil sub-units and the vertically stacked outer coil sub-units. The coolant flow control members are disposed only in this intermediate vertical coolant passage to decrease periodically the horizontal sectional area thereof at the pitch of nP in the same manner as mentioned above.
摘要:
According to the invention, a sealing top plate in a multi-chip module is formed from a ceramic with high thermal conductivity having a thermal expansion coefficient consistent with that of a multi-layer circuit substrate. A cooling flow path cover covering the entirety of cooling flow path grooves is formed as a separate metallic member. The back surface of the sealing top plate, on which are formed the cooling flow path grooves, is bonded directly to the back surface of a semiconductor device using solder. A thermal-conductive jacket with low thermal resistance is provided. A multi-chip module sealing frame is soldered to the edge of the sealing top plate. Furthermore, a sealing material such as an O-ring is simply interposed between the edge of the sealing top plate and the cooling water path cover, and tightening means is used to tighten the metallic cooling flow path cover and the multi-chip module sealing frame to each other.
摘要:
There are provided a highly thermal conductive grease composition having both a thermal conductivity and a satisfactory dispense property, and a cooling device applied with same. The grease composition comprises from 70 to 90% by volume of an inorganic powder which is a mixture containing at least two kinds of inorganic powders different from each other in each average particle size, and from 10 to 30% by volume of a base oil containing a mineral oil or a synthetic oil, the base oil further containing a surfactant in an amount of from 0.2 to 2.0% by weight based on the weight of the inorganic powder.
摘要:
A highly reliable electronic apparatus free from condensation in the cabinet of the apparatus. The electronic apparatus has printed circuit boards on which heat emitting semiconductor devices are mounted and a fan. The electronic apparatus further comprises a hygrometer for measuring the relative humidity and dew-point temperature of the cooling air that is introduced into the cabinet through an opening, a surface temperature sensor for sensing the temperature of the surface of the semiconductor devices, an internal temperature sensor for sensing the internal temperature of the semiconductor device, dehumidifier and heater means made up of a heat pump and an outdoor unit, and a controller for controlling the dehumidifier means and the heater means so that the relative humidity is less than 100% and the dew-point temperature is less than the surface temperature of the semiconductor devices.
摘要:
The cooling apparatus has cooling fins attached to heat generating units of electronic devices and provided with a plurality of elemental fins. According to one embodiment, the cooling apparatus has a first cooling fin composed of elemental fins that are uniform in fin density in the height direction of the cooling fin from a fin base. The cooling apparatus also has a second cooling fin composed of elemental fins with a zero or small fin density at the lower portion close to a fin base of the cooling fin as compared with the fin density at the upper portion of the cooling fin. The first and second cooling fins are positioned adjacent to one another. Various different embodiments of cooling fins are disclosed.
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:
A cooling apparatus of electronic devices including thermal conductive members each of which is positioned with one side thereof being in contact with a surface of each electronic device, the other side thereof being fitted to a housing with a small clearance provided therebetween, so as to diffuse and remove heat generated in the electronic devices. In order to press each thermal conductive member onto the associated electronic device, a resilient member is provided between the housing and the thermal conductive member, and is arranged to have a width larger than a width of grooves between fins formed on the housing and also larger than a width of grooves between fins formed on the thermal conductive member. A setting space to receive each resilient member therein is formed in a region where the fins are fitted to each other, so that the resilient member and the thermal conductive member can be fitted and positioned with respect to the housing when the resilient member is provided in this setting space.
摘要:
The present invention relates to a cooling apparatus for an electronic device, in which a cooling solid body in close contact through thermal conductive fluid with a heat transfer portion of the electronic device is provided, on its one surface in contact with the electronic device, with a number of grooves communicating with the outside of the heat transfer portion, and a spring member for elastically pressing this cooling solid body on the electronic device is provided for forcing the cooling solid body into close contact with the electronic device by means of the thermal conductive fluid in a third layer.
摘要:
A heating portion is cooled by a fluid, thereby effecting a temperature control. The temperature of the fluid is measured at the time of starting of a system, and the measured fluid temperature is compared with a set temperature. In accordance with the result of the comparison, the timing of starting the operation of LSI chips and the timing of starting the operation of a refrigerator are controlled.
摘要:
In a heat transfer surface having cavity groups and restricted opening groups in an outer surface region, the cavity groups are composed of a plurality of rows of void strip members. The cavity strip members are arranged in parallel on a base member of the heat transfer surface and are laminated in one or more layers. Each strip member has a number of elongate cavities laterally arranged in parallel. The elongate cavities are closed at upper surfaces and have at both ends openings. The adjacent cavities in the same layer are communicated with each other by communicating portions each provided between the cavity strip members and by the openings. The restricted opening groups are formed on the upper surfaces of the communicating portions. The restricted opening groups render the communicating portions in one layer, the communicating portions in another layer and the outside to communicate with each another. The method of manufacturing such a heat transfer surface is also disclosed.