Abstract: The tank main body of a header tank of a condenser has slits formed in a circumferential wall thereof at positions between opposite end surfaces of the circumferential wall and heat exchange tubes at the opposite ends. Plate-shaped closure members are inserted into the slits from the outside of the tank main body and joined to the circumferential wall of the tank main body. Drain openings are formed in the circumferential wall of the tank main body at positions on the outer sides of the closure members as viewed in the longitudinal direction of the tank main body. A portion of a surface of each closure member which faces outward in the longitudinal direction of the tank main body forms a portion of a peripheral edge of the corresponding drain opening.

Abstract: A first header tank of a condenser serves as a condensation section outlet header section. A second header tank has lower end upper ends respectively located below and above the lower end of the first header tank. A portion of a second header tank located below the lower end of the first header tank serves as a super-cooling section inlet header section. The second header tank also serves as a reservoir section. The interior of the condensation section outlet header section of the first header tank communicates, through a communication section, with a portion of the interior of the second header tank, which portion is located above the lower end of the first header tank. A flow velocity reducing member is provided in the second header tank so as to reduce the flow velocity of liquid-phase dominant refrigerant which flows into the reservoir section through the communication section.

Abstract: The tank main body of a header tank of a condenser has slits formed in a circumferential wall thereof at positions between opposite end surfaces of the circumferential wall and heat exchange tubes at the opposite ends. Plate-shaped closure members are inserted into the slits from the outside of the tank main body and joined to the circumferential wall of the tank main body. Drain openings are formed in the circumferential wall of the tank main body at positions on the outer sides of the closure members as viewed in the longitudinal direction of the tank main body. A portion of a surface of each closure member which faces outward in the longitudinal direction of the tank main body forms a portion of a peripheral edge of the corresponding drain opening.

Abstract: A first header tank of a condenser serves as a condensation section outlet header section. A second header tank has lower end upper ends respectively located below and above the lower end of the first header tank. A portion of a second header tank located below the lower end of the first header tank serves as a super-cooling section inlet header section. The second header tank also serves as a reservoir section. The interior of the condensation section outlet header section of the first header tank communicates, through a communication section, with a portion of the interior of the second header tank, which portion is located above the lower end of the first header tank. A flow velocity reducing member is provided in the second header tank so as to reduce the flow velocity of liquid-phase dominant refrigerant which flows into the reservoir section through the communication section.

Abstract: A condenser includes first and second header tanks provided at one end thereof such that the latter is located on the outer side of the former. First heat exchange tubes forming a first heat exchange path provided in a condensation part are connected to the first header tank. Second heat exchange tubes forming a second heat exchange path provided in a super-cooling part are connected to the second header tank. The first header tank has one communication section which communicates with the second header tank through a communication part and to which all the heat exchange tubes forming the first heat exchange path are connected. The communication part is provided at a height below the uppermost heat exchange tube among all the heat exchange tubes connected to the communication section. The upper end of the first header tank is located above the lower end of the second header tank.

Abstract: An evaporator 1 includes a refrigerant inlet header section 5 and a refrigerant outlet header section 6 which are arranged in the front-rear direction, a refrigerant circulation passage for establishing fluid communication between the header sections 5 and 6. First ends of the header sections 5 and 6 are closed with a first cap 19 and the second ends thereof are closed with a second cap 18. A refrigerant inlet 37 and a refrigerant outlet are formed in the first cap 19. A pipe joint member 21, having a refrigerant inflow port 45 communicating with the refrigerant inlet 37 and a refrigerant outflow port 46 communicating with the refrigerant outlet 38, is joined to the first cap 19. Mating concave portions 19a and 19b are formed on the first cap 19. Mating convex portions 21a and 21b which project toward the first cap 19 and which are to be fitted into the mating concave portions 19a and 19b, respectively, are formed on the pipe joint member 21.

Abstract: A heat exchanger includes a heat exchange core including a plurality of heat exchange tubes, a refrigerant inlet header and a refrigerant outlet header arranged toward one end of each heat exchange tube, and a refrigerant inflow header and a refrigerant outflow header arranged toward the other end of each heat exchange tube. The outlet header has an interior divided into two spaces by a flow dividing resistance plate, and some of the heat exchange tubes are joined to the outlet header so as to communicate with the space. The resistance plate has a plurality of refrigerant passing holes formed therein that are different in shape and/or size. The outlet header is provided on the outer surface thereof with identification marks for discriminating the positions of the refrigerant passing holes and representing the shapes and/or sizes of the holes.

Abstract: A double-wall-tube heat exchanger has an outer tube, and an inner tube disposed concentrically in and spaced apart from the outer tube. A clearance between the outer tube and the inner tube and the interior of the inner tube serve as respective refrigerant flow paths. The inner tube has a plurality of interior fins formed on its inner circumferential surface. The interior fins project radially inward; extend in a longitudinal direction of the inner tube; and are arranged at circumferential intervals. The inner tube has a plurality of elongated projections formed on its outer circumferential surface. The elongated projections project radially outward; extend in the longitudinal direction; and are arranged at circumferential intervals. The interior fins are greater in height than the elongated projections. The double-wall-tube heat exchanger exhibits excellent heat exchange performance.

Abstract: An evaporator 1 includes a refrigerant inlet header section 5 and a refrigerant outlet header section 6 which are arranged in the front-rear direction, a refrigerant circulation passage for establishing fluid communication between the header sections 5 and 6. First ends of the header sections 5 and 6 are closed with a first cap 19 and the second ends thereof are closed with a second cap 18. A refrigerant inlet 37 and a refrigerant outlet are formed in the first cap 19. A pipe joint member 21, having a refrigerant inflow port 45 communicating with the refrigerant inlet 37 and a refrigerant outflow port 46 communicating with the refrigerant outlet 38, is joined to the first cap 19. Mating concave portions 19a and 19b are formed on the first cap 19. Mating convex portions 21a and 21b which project toward the first cap 19 and which are to be fitted into the mating concave portions 19a and 19b, respectively, are formed on the pipe joint member 21.

Abstract: A heat exchanger employed as an evaporator includes a heat exchange core section and first to fourth headers 5, 6, 9, 11. The headers 5, 6 include hollow header bodies 10, 20 having opposite ends opened, and caps 18a, 18b, 19a, 19b fixed to the corresponding opposite end openings. The caps 18a, 18b have flat wall portions 32a, 33a, 34a which close the corresponding end openings of the header bodies 10, 20. A reinforcement projection portion 30 projecting toward the interior of the header 5 is formed on the flat wall portion 32a of the cap 18a. In the heat exchanger, the header 5 exhibits enhanced withstand pressure.

Abstract: A heat exchanger includes a heat exchange core including a plurality of heat exchange tubes, a refrigerant inlet header and a refrigerant outlet header arranged toward one end of each heat exchange tube, and a refrigerant inflow header and a refrigerant outflow header arranged toward the other end of each heat exchange tube. The outlet header has an interior divided into two spaces by a flow dividing resistance plate, and some of the heat exchange tubes are joined to the outlet header so as to communicate with the space. The resistance plate has a plurality of refrigerant passing holes formed therein that are different in shape and/or size. The outlet header is provided on the outer surface thereof with identification marks for discriminating the positions of the refrigerant passing holes and representing the shapes and/or sizes of the holes.

Abstract: A heat exchanger employed as an evaporator includes a heat exchange core section and first to fourth headers 5, 6, 9, 11. The headers 5, 6 include hollow header bodies 10, 20 having opposite ends opened, and caps 18a, 18b, 19a, 19b fixed to the corresponding opposite end openings. The caps 18a, 18b have flat wall portions 32a, 33a, 34a which close the corresponding end openings of the header bodies 10, 20. A reinforcement projection portion 30 projecting toward the interior of the header 5 is formed on the flat wall portion 32a of the cap 18a. In the heat exchanger, the header 5 exhibits enhanced withstand pressure.