Abstract:
In production of a serpentine-type aluminum heat exchanger having an aluminum flat tube with a plurality of fluid passageways and aluminum header pipes connected to opposite ends of the flat tube, flat sleeves with outer end flanges of aluminum alloy brazing filler metal are fitted on the opposite end portions of the flat tube while the end flanges being in contact with outer surfaces of the header pipes. The sleeves and end flanges are melted by heating so that the header pipes are brazed to the flat tube.
Abstract:
In a corrugated fin unit assembled to a serpentine-anfractuous refrigerant pipe in a serpentine-type heat exchanger, each of generally parallel fin plate portions of the fin unit has a group of louvers parallel to the fin plate portion in the windward region and another group of louvers inclined downwardly in the leeward region, to thereby reduce air flow resistance of each fin unit without substantial reduction of heat exchange rate of the heat exchanger.
Abstract:
A heat exchanger is provided with a first tank and a second tank. Heat transfer tubes are disposed between the tanks and are connected to the tanks to place the tanks in fluid communication. Either of the tanks may be divided into chambers by a partition. The partition has at least one portion which is oriented to be angularly offset from the direction of an air flow passing through the heat exchanger. The orientation of the partition permits the heat transfer tubes to be connected to the tanks in an arrangement so that no portion of the air flow can pass through the heat exchanger without striking at least one of the heat transfer tubes.
Abstract:
A condenser, for use in automotive air conditioning systems, including a first header, a second header, a plurality of parallel flat plate pipes arranged between the first and second headers, and corrugated fins between the flat plate pipes for contacting the flat surfaces thereof. A second union joint on the second header introduces refrigerant into the second header. A first union joint on the first header discharges refrigerant to a refrigeration circuit. The first union joint includes a union portion for connecting the first union joint with the refrigeration circuit, a fixed portion with a receiving surface which is fitted on the outer peripheral surface of the first header, and a pipe which is connected to the union portion. The pipe extends downwardly within the first header to the bottom of the first header, and thus, the first union joint discharging liquid refrigerant can be disposed anywhere on the first header.
Abstract:
A heat exchanger includes a pair of header pipes, a plurality of flat heat-transfer tubes parallel to each other, a plurality of radiation fins provided on the sides of the flat heat-transfer tubes, an additional flat heat-transfer tube disposed adjacent to the end flat heat-transfer tube, having a path cross-sectional area larger than those of the flat heat-transfer tubes and being connected to one of the header pipes and a joint unit, and an additional radiation fin provided on at least one side of the additional flat heat-transfer tube. The vacant space in the space for installation of the heat exchanger can be utilized as an additional heat exchange portion formed by the additional tube and fin; and the effectiveness of the heat exchanger can be efficiently increased even if the space for the installation is small or limited.
Abstract:
A heat exchanger including a first and second header is disclosed. The headers are linked in fluid communication by a plurality of elongated fluid tubes. In a first embodiment, the first and second headers are integrally formed as a single pipe having a partition wall extending radially across. Left and right intermediate headers are disposed laterally of the single pipe. Two groups of fluid tubes link the first header to a lower portion of the intermediate headers, and two additional groups of fluid tubes link the intermediate headers to an upper portion of the second header. In a second embodiment, the first and second headers are disposed in a spaced parallel arrangement and are approximately half the length of the left and right intermediate headers with which they are linked at an upper portion of the intermediate headers by fluid tubes. The lower parts of the intermediate headers are linked directly by a third group of tubes to complete the fluid circuit of the heat exchanger.
Abstract:
A heat exchanger having a flat tube with a plurality of fluid passageways therein, header pipes connected to opposite ends of the flat tube and inlet and outlet tubes connected to the header pipes, respectively. The inlet and outlet tubes are inserted and fitted into the corresponding ones of the header pipes and formed with axial slits in the inserted end portions. The opposite ends of the flat tube extend into header pipes through axial slits in the outer surfaces thereof and are fitted into the axial slits of the inlet and outlet tubes inserted therein. Thus, the inlet tube and the outlet tube are reliably maintained in their desired orientation. The header pipes are made of aluminum brazing sheet and, therefore, are brazed to the aluminum flat tube and the inlet and outlet aluminum tubes.
Abstract:
A light reflector which can be manufactured easily by using a plastic base material that is light weight and low cost and has high reflectivity, and a method for manufacturing the same. The light reflector comprises a plastic base material 50 of which thermal deformation temperature is 130° C. or higher, and a reflecting film 52 containing silver and formed on the surface of the base material, wherein said plastic base material 50 is a molded article of thermosetting resin and the reflecting film has a smooth surface with PV (peak-to-valley) roughness of 0.5 μm or less without sharp protrusions and reflectivity of the reflecting film is 96% or more.
Abstract:
A heat exchanger includes reservoirs spaced apart from each other and a plurality of parallel heat transfer tubes fluidly connecting the reservoirs. An end portion of each heat transfer tube is connected to at least one of the reservoirs so that the end portion does not project into the interior of the reservoir. Thus, the dimension of the reservoir in the axial direction of the tubes and a proper volume of heat transfer medium may be minimized. Further, pressure loss can be reduced because there are no projecting tubes in the reservoirs to obstruct the flow of the heat transfer medium. Moreover, the strength of the connection between the tubes and the reservoirs can be increased because more contacting surface area is provided for making the connection, for example by brazing.