Abstract: A heat exchanger has header tanks each including a header forming plate, a tube connecting plate, and an intermediate plate interposed between the two plates, the plates being arranged in superposed layers and brazed to one another. Each of the plates is made from a metal plate by press work. The header forming plate has an outward bulging portion. The tube connecting plate has tube insertion holes. The intermediate plate has communication holes causing tube insertion holes to communicate with the interior of each outward bulging portion therethrough. Heat exchange tubes have opposite ends placed into the respective insertion holes and brazed to the respective tube connecting plates. The heat exchanger including such header tanks is reduced in the number of components, can be fabricated with a high work efficiency, and exhibits improved heat exchange performance.

Abstract: A heat exchanger has header tanks each including a header forming plate, a tube connecting plate, and an intermediate plate interposed between the two plates, the plates being arranged in superposed layers and brazed to one another. Each of the plates is made from a metal plate by press work. The header forming plate has an outward bulging portion. The tube connecting plate has tube insertion holes. The intermediate plate has communication holes causing tube insertion holes to communicate with the interior of each outward bulging portion therethrough. Heat exchange tubes have opposite ends placed into the respective insertion holes and brazed to the respective tube connecting plates. The heat exchanger including such header tanks is reduced in the number of components, can be fabricated with a high work efficiency, and exhibits improved heat exchange performance.

Abstract: An evaporator has a header tank including a header forming plate with outward bulging portions, a tube connecting plate, and an intermediate plate. Tube insertion holes are formed in the tube connecting plate. Communication holes formed in the intermediate plate cause the tube insertion holes to communicate with the interior of the corresponding outward bulging portion therethrough. At least one of the outward bulging portions allows a refrigerant to flow therethrough longitudinally. All the communication holes in communication with the refrigerant passing bulging portion are held in communication by communication portions for the communication holes, the communication portions providing a refrigerant passageway. The refrigerant passageway is altered in cross sectional area along the longitudinal direction thereof by adjusting the width of the communication portions.

Abstract: An evaporator includes a pair of header tanks arranged one above the other at a spacing, a plurality of heat exchange tubes arranged in parallel between the pair of header tanks and having opposite ends joined to the respective header tanks, and fins arranged between respective left-to-right adjacent pairs of heat exchange tubes. The lower header tank includes a tank forming member and a tube connecting plate joined to the tank forming member. The tube connecting plate has a plurality of drain guides arranged at a spacing in a left-right direction. The drain guides each include a cutout portion formed in an upper surface cover portion of the tube connecting plate for covering the upper surface of the tank forming member to a side cover portion of the plate for covering a side face of the member. The amount of condensation water to be collected on the top surface of the lower tank can be diminished.

Abstract: A semiconductor device is disclosed that includes a ceramic substrate having first and second surfaces, a semiconductor element, a radiator, and an interposed portion located between the second surface and the radiator. The interposed portion has coupling regions that couple the second surface to the radiator, and non-coupling regions that do not couple the second surface to the radiator. Each non-coupling region is formed as an elongated groove. In the group of the non-coupling regions, the width of the outermost non-coupling region in the interposed portion is greater than the width of the innermost non-coupling region in the interposed portion. Regarding an adjacent pair of the non-coupling regions in the width direction, the width of the outer non-coupling region is greater than or equal to the width of the inner non-coupling region.

Abstract: An upper header tank of an evaporator is formed by three plates. The outside plate has an inflow-side refrigerant-passage outwardly bulging portion whose one end portion communicates with a refrigerant inlet. The inside plate has tube insertion holes. The intermediate plate has communication holes for establishing communication between the tube insertion holes of the inside plate and the outwardly bulging portion of the outside plate. The communication holes of the intermediate plate are connected by communication portions so as to form a resin passage communicating with the outwardly bulging portion. Of all the communication portions of the refrigerant passage, a plurality of upstream communication portions are smaller in width than the remaining communication portions. The relation 0.25?A/B?0.35 is satisfied, where A represents the number of the narrow communication portions, and B represents the total number of the communication holes which form the refrigerant passage.

Abstract: A heat exchanger includes an outer tube and an inner tube having a plurality of fins for ed on an external periphery of the inner tube and disposed in the outer tube. The heat exchanger is designed to exchange heat between first fluid passing through the inner tube and second fluid passing in between the outer tube and the inner tube. A gap is formed between an internal periphery of the outer tube and a tip end of each of the plurality of fins of the inner tube. This structure can improve the heat exchanging performance and provide a heat exchanger excellent in vending workability.

Abstract: A heat exchanger includes two header tanks and a plurality of heat exchange tubes. The header tanks each include an outside plate, an inside plate, and an intermediate plate. The outside plate has an outwardly bulging portion(s). The inside plate has a plurality of tube insertion holes. The intermediate plate has communication holes for allowing communication of the tube insertion holes with the outwardly bulging portion of the header tank. A pair of inclined portions inclined in a fanning-out fashion toward the inside plate are formed at inside-plate-side edge portions of opposite wall surfaces of each communication hole which extend in the hole-length direction. Projecting portions of the inside plate are formed by bending, toward the intermediate plate, portions of the inside plate located at opposite edges of each tube insertion hole which extend in the hole-length direction. The projecting portions are closely brazed to the corresponding inclined portions.

Abstract: A heat-exchanger header tank of a gas cooler includes a tank formation member, a tube-connecting plate joined to the tank formation member outer surface, and a partition disposed within and joined to the tank formation member to divide the tank formation member interior into plural refrigerant channels extending in the longitudinal direction of the tank formation member and arranged in the front-rear direction. Tube insertion holes are formed in a wall of the tank formation member and in the tube-connecting plate at mutually aligned positions. Tube-end fit cutouts partially receiving corresponding end portions of heat exchange tubes are formed on the partition to align with corresponding tube insertion holes. The cross-sectional profile of the header tank can be appropriately selected for an installation space for the gas cooler, and the cross-sectional shape and area of a refrigerant channel can be readily changed.

Abstract: A refrigerant flow section connection structure has a channel member 26 having a refrigerant channel 28, a pipe 25 having a distal end portion fitted into the other end opening of the refrigerant channel 28 of the channel member 26, a fixing member 27 for fixing the pipe 25 to the channel member 26, and screw tightening means for joining the channel member 26 and the fixing member 27 together at their end portions. The channel member 26 has an engaging portion 32 to engage with a projection 35 of the fixing member 27. The refrigerant flow section connection structure for use in a refrigeration cycle according to the present invention has an improved withstand pressure.

Abstract: An evaporator has a header tank including a header forming plate with outward bulging portions, a tube connecting plate, and an intermediate plate. Tube insertion holes are formed in the tube connecting plate. Communication holes formed in the intermediate plate cause the tube insertion holes to communicate with the interior of the corresponding outward bulging portion therethrough. At least one of the outward bulging portions allows a refrigerant to flow therethrough longitudinally. All the communication holes in communication with the refrigerant passing bulging portion are held in communication by communication portions for the communication holes, the communication portions providing a refrigerant passageway. The refrigerant passageway is altered in cross sectional area along the longitudinal direction thereof by adjusting the width of the communication portions.

Abstract: An upper header tank of an evaporator is formed by three plates. The outside plate has an inflow-side refrigerant-passage outwardly bulging portion whose one end portion communicates with a refrigerant inlet. The inside plate has tube insertion holes. The intermediate plate has communication holes for establishing communication between the tube insertion holes of the inside plate and the outwardly bulging portion of the outside plate. The communication holes of the intermediate plate are connected by communication portions so as to form a resin passage communicating with the outwardly bulging portion. Of all the communication portions of the refrigerant passage, a plurality of upstream communication portions are smaller in width than the remaining communication portions. The relation 0.25?A/B?0.35 is satisfied, where A represents the number of the narrow communication portions, and B represents the total number of the communication holes which form the refrigerant passage.

Abstract: A connecting device for a heat exchanger which has a fluid circulating channel formed with an opening at one end thereof and an opening at the other end thereof, the openings being formed as juxtaposed in one side of the heat exchanger. The connecting device comprises a blocklike connector body having two horizontal through bores corresponding to the respective openings and fixed to the heat exchanger with the through bores in coincidence with the respective openings. A tubular member is fluid-tightly fitted in each of the through bores and has a connecting end projecting toward a connectable device. The connecting end is in the form of a spigot fittable in a socket of the connectable device.

Abstract: A multi-bored flat tube has outermost unit passages located at both ends of the tube and intermediate unit passages between the outermost unit passages. The outermost unit passage has a circular-based inner surface in cross-section, such as a circumferentially smooth curved shape in cross-section like a perfect circular shape or elliptical shape, or has a circular-based inner surface in cross-section having a plurality of inner fins extending in a longitudinal direction of the tube. The intermediate unit passage has a non-circular based cross-sectional shape, such as rectangular, triangular, trapezoidal, or circular based shape including a plurality of inner fins. The tube is strong against being hit by a stone and has a high heat exchanging performance.

Abstract: A connecting device for a heat exchanger which has a fluid circulating channel formed with an opening at one end thereof and an opening at the other end thereof, the openings being formed as juxtaposed in one side of the heat exchanger. The connecting device comprises a blocklike connector body having two horizontal through bores corresponding to the respective openings and fixed to the heat exchanger with the through bores in coincidence with the respective openings. A tubular member is fluid-tightly fitted in each of the through bores and has a connecting end projecting toward a connectable device. The connecting end is in the form of a spigot fittable in a socket of the connectable device.

Abstract: A connecting device for a heat exchanger which has a fluid circulating channel formed with an opening at one end thereof and an opening at the other end thereof, the openings being formed as juxtaposed in one side of the heat exchanger. The connecting device comprises a blocklike connector body having two horizontal through bores corresponding to the respective openings and fixed to the heat exchanger with the through bores in coincidence with the respective openings. A tubular member is fluid-tightly fitted in each of the through bores and has a connecting end projecting toward a connectable device. The connecting end is in the form of a spigot fittable in a socket of the connectable device.

Abstract: A multi-bored flat tube has outermost unit passages located at both ends of the tube and intermediate unit passages between the outermost unit passages. The outermost unit passage has a circular-based inner surface in cross-section, such as a circumferentially smooth curved shape in cross-section like a perfect circular shape or elliptical shape, or has a circular-based inner surface in cross-section having a plurality of inner fins extending in a longitudinal direction of the tube. The intermediate unit passage has a non-circular based cross-sectional shape, such as rectangular, triangular, trapezoidal, or circular based shape including a plurality of inner fins. The tube is strong against being hit by a stone and has a high heat exchanging performance.