Abstract: A plate type heat exchanger has a plurality of tube units and a plurality of corrugated fins. Each of the tube units is formed by a pair of plates, namely a pair of plates are connected to each other by a brazing material at a connecting portion at an outer periphery of the plate and a center rib at a center axis of the plate. The center rib has an enlarged portion at the top end thereof in order to gather the molten brazing material toward the enlarged portion. The brazing at the center rib is started from the enlarged portion. Therefore a brazing defect is prevented from occurring at the top end of the center rib. Since the tube unit is effectively connected by brazing, the tube unit of the present invention has enough anti-pressure strength.

Abstract: A multi-layer type heat exchanger is formed by a row of parallel flat tubes each having tank portions spaced widthwise of the flat tube and disposed adjacent to one end thereof. Each tube defines therein a passage for a heat transfer fluid extending from one tank portion towards the other end of the tube and is then turned to the other tank portion. The flat tubes are stacked such that the tank portions are connected together in fluid-flow communication with each other. The portions of each adjacent pair of tubes excepting the tank portions are spaced apart to accommodate a corrugated fin. Each tube is formed by two press-worked core plates soldered together to form the passage in the tube. Two adjacent core plates of each adjacent pair of tubes have bent end portions extending to and engaged with each other or integrally connected together to support the other ends of the adjacent tubes in spaced relationship to accommodate the fin therebetween.

Abstract: A receiver has a good usage for receiving coolant in a refrigerant circuit. The receiver can improve the fixing and the connecting operation when the receiver is connected with the refrigerant circuit provided in an automotive engine room. The receiver is comprised of a receiver housing having a flat upper surface and a couple of block joints having a flat lower surface. The block joints are furnished on the upper surface of the receiver housing by screwing. The block joints have connecting halls an inlet and an outlet pipes are jointed therein. At least one of the connecting halls are formed vertically so that at least one of the inlet and the outlet pipes elongates upwardly. Therefore, the inlet or the outlet pipe has advantage to be connected easily and effectively.