Abstract: A main core portion (6) performing heat exchange between air and a refrigerant, a receiver tank (8) into which the refrigerant having flowed through the main core portion flows, a sub-cool core portion (10) for sub-cooling a liquid refrigerant having flowed through the receiver tank by heat exchange with air, a first flow path (36b, 68, 78) through which a refrigerant flows in order of the main core portion, the receiver tank, and the sub-cool core portion, a second flow path (36a, 36c, 68, 72) through which the refrigerant flows in order of the main core portion and the sub-cool core portion by bypassing the receiver tank, and flow-path switching means (82) for switching between the first flow path and the second flow path.

Abstract: Cooling performance is secured by reducing a compression loss when a high-pressure gas refrigerant is allowed to flow without heat exchange on cooling in a vehicle interior heat exchanger. In the vehicle interior heat exchanger, an upstream header and a downstream header are communicated and connected with the same end side of the refrigerant circulation tubes of an upstream tube group and a downstream tube group where the refrigerant circulation tubes are stacked. Internal spaces of the upstream header and the downstream header are communicated and connected with each other via communication holes in the boss portions of the connecting member. In the vehicle interior heat exchanger, the total opening area of the communication holes is set such that the percentage thereof, with respect to the total opening area of the channel on the uppermost stream side of the upstream tube group, is in the range of 38% to 93%.

Abstract: In a heat exchanger of a heat pump system having a main core portion, a subcool core portion, and a receiver tank, the main core portion and the subcool core portion are constituted by a pair of header tanks arranged apart from each other in a vertical direction, a plurality of tubes arranged so as to extend in the vertical direction between the header tanks and having the pair of header tanks communicate with each other, and fins arranged between the adjacent tubes, and a first channel having a refrigerant pass through the main core portion, the receiver tank, and the subcool core portion in order and a second channel having the refrigerant pass only through the main core portion in a direction opposite to that of the first channel are provided.

Abstract: A heat exchanger includes a main core portion (6) for conducting heat exchange between an air and a refrigerant, a receiver tank (8) into which the refrigerant having passed through the main core portion flows, and a subcool core portion (10) for supercooling and liquefying a gas-liquid mixed refrigerant having passed through the receiver tank by heat exchange with the air, wherein the subcool core portion is composed of a plurality of tubes (22) arranged along a crosswise direction between left and right header tanks (20) arranged along the crosswise direction, respectively, in a state in parallel with each other and communicating with both the left and right header tanks; and fins (24) arranged between the adjacent tubes.

Abstract: A heat exchanger includes a single refrigerant pipe (44) for introducing a refrigerant into a receiver tank (14) from a condenser header part (20, 26), and a mounting member (40) for mounting the receiver tank to a core (10). The mounting member has a refrigerant inlet passage (56) connecting the refrigerant pipe to the interior of the receiver tank, and a refrigerant outlet passage (58) connecting the interior of the receiver tank to a sub-cooler header part (22, 28).

Abstract: A connection structure for front and rear header tanks 102 and 202 in a duplex heat exchanger is provided. A connecting member 300 includes two identically shaped long and narrow plate members 301 and 302, a plurality of communication holes 301a and 302a having boss portions 301b and 302b protruding cylindrically by burring from one surface of each of the plate members 301 and 302, is formed to be arranged on the plate members, and the plate members 301 and 302 are joined to each other back to back. The connecting member 300 is disposed between two header tanks 102 and 202 which communicate with each other, and the boss portions 301b and 302b are inserted into holes 102c and 202c formed on the header tanks 102 and 202, so that the connecting member 300 is joined to the header tanks 102 and 202.

Abstract: To provide a counter-flow type interior heat exchanger capable of reducing variation in outlet air temperature during heating, and capable of reducing heat exchange with blown air and reducing pressure loss generated when a gas refrigerant passes during cooling, to ensure cooling performance. A heat exchange region of a first tube group 103Au of a first heat exchanger disposed downstream in an air blowing direction and a heat exchange region of a fourth tube group 103Bd of a second heat exchanger disposed upstream in the air blowing direction are made to be larger (are imparted with a larger number of tubes) than a heat exchange region of a second tube group 103Ad of the first heat exchanger and a heat exchange region of the fourth tube group 103Bd of the second heat exchanger, and refrigerant channel areas of the first and second tube groups (total sectional area of the tube groups) are set to be larger than a sectional area of a refrigerant introduction pipe 110.

Abstract: A main core portion (6) performing heat exchange between air and a refrigerant, a receiver tank (8) into which the refrigerant having flowed through the main core portion flows, a sub-cool core portion (10) for sub-cooling a liquid refrigerant having flowed through the receiver tank by heat exchange with air, a first flow path (36b, 68, 78) through which a refrigerant flows in order of the main core portion, the receiver tank, and the sub-cool core portion, a second flow path (36a, 36c, 68, 72) through which the refrigerant flows in order of the main core portion and the sub-cool core portion by bypassing the receiver tank, and flow-path switching means (82) for switching between the first flow path and the second flow path.

Abstract: A heat exchanger (1) of a heat pump system (2) having a main core part (6), a subcool core part (10), and a receiver tank (8), the main core part (6) and the subcool core part (10) having: a first flow channel comprising a pair of header tanks (12) arranged separated from each other in the vertical direction, a plurality of tubes (14) arranged so as to extend vertically between the header tanks (12), the tubes (14) passing through the pair of header tanks (12), and a fin (16) arranged between adjacent tubes (14), the first flow channel allowing the coolant to pass through in the sequence of the main core part (6), the receiver tank (8), and the subcool core part (10); and a second flow channel for allowing the coolant to pass through the main core part (6) only, in the direction opposite that of the first flow channel.

Abstract: Cooling performance is secured by reducing a compression loss when a high-pressure gas refrigerant is allowed to flow without heat exchange on cooling in a vehicle interior heat exchanger. In the vehicle interior heat exchanger, an upstream header and a downstream header are communicated and connected with the same end side of the refrigerant circulation tubes of an upstream tube group and a downstream tube group where the refrigerant circulation tubes are stacked. Internal spaces of the upstream header and the downstream header are communicated and connected with each other via communication holes in the boss portions of the connecting member. In the vehicle interior heat exchanger, the total opening area of the communication holes is set such that the percentage thereof, with respect to the total opening area of the channel on the uppermost stream side of the upstream tube group, is in the range of 38% to 93%.

Abstract: An interior condenser (1, 32) which is accommodated in an HVAC unit of a vehicle air-condoning heat pump system, the interior condenser including: a heat exchange core (6) that is composed of stacked tubes (2) and fins (4); a refrigerant inflow/outflow-side tank (10, 34) to which one end portions of the tubes are connected; a refrigerant turn-side tank (12) to which the other end portions of the tubes are connected; a partition wall (14) that separates an inner portion of the refrigerant inflow/outflow-side tank into a refrigerant inflow chamber (16) and a refrigerant outflow chamber (18); a refrigerant inlet tube (28) that is connected to the refrigerant inflow/outflow-side tank to communicate with the refrigerant inflow chamber; and a refrigerant outlet tube (30) that is connected to the refrigerant inflow/outflow-side tank to communicate with the refrigerant outflow chamber, wherein the refrigerant outlet tube is connected to the refrigerant inflow/outflow-side tank at a position below the core.

Abstract: A heat exchanger includes a plurality of heat exchanger units, each of which including header pipes (4,6) disposed in parallel to each other, a plurality of tubes (8) communicating with the header pipes and being disposed between the header pipes, fins (10) disposed between adjacent tubes, wherein a core portion (12) of the heat exchanger unit (2) is configured with the tubes and the fins layered therebetween; wherein the plurality of heat exchanger units are disposed in a direction that the tubes and the fins are arranged; and wherein the heat exchanger includes: fitting portions (16,18) which connect respective end portions (4a, 6a) of the header pipes of the heat exchanger units that are adjacent to each other, and side plates (20,22,40,42,46,48) which connect opposing end portions (12a) of respective core portions of the heat exchanger units that are adjacent to each other.

Abstract: A heat exchanger includes a main core portion (6) for conducting heat exchange between an air and a refrigerant, a receiver tank (8) into which the refrigerant having passed through the main core portion flows, and a subcool core portion (10) for supercooling and liquefying a gas-liquid mixed refrigerant having passed through the receiver tank by heat exchange with the air, wherein the subcool core portion is composed of a plurality of tubes (22) arranged along a crosswise direction between left and right header tanks (20) arranged along the crosswise direction, respectively, in a state in parallel with each other and communicating with both the left and right header tanks; and fins (24) arranged between the adjacent tubes.

Abstract: A heat exchanger includes a single refrigerant pipe (44) for introducing a refrigerant into a receiver tank (14) from a condenser header part (20, 26), and a mounting member (40) for mounting the receiver tank to a core (10). The mounting member has a refrigerant inlet passage (56) connecting the refrigerant pipe to the interior of the receiver tank, and a refrigerant outlet passage (58) connecting the interior of the receiver tank to a sub-cooler header part (22, 28).

Abstract: Provided is a heat exchanger in which drainage performance of a tube and a fin is improved while preventing reduction in heat exchange efficiency. The heat exchanger includes: a tube having flat surfaces opposed to each other at a predetermined interval; and a fin including a bent portion and a flat portion which are alternately formed in a longitudinal direction, the bent portion being joined to the opposing flat surfaces of the tube. The fin has a predetermined lateral range (bent portion) in the bent portion which is brought into contact with one of the opposing flat surfaces, the predetermined lateral range being bent toward another of the opposing flat surfaces and joined to the another of the opposing flat surfaces, thereby forming a communication path.

Abstract: Provided is a tube for a heat exchanger in which drainage performance of the tube and the fin is improved while preventing the brazing failure. That is, provided is a tube (110) for a heat exchanger, the tube through which a refrigerant flows being formed into a flat plate shape, the tube including stepped portions (117 and 118) at both end portions (110a and 110b) in a refrigerant flowing direction, respectively, in which the tube has a widthwise length in a region on an end portion (110a or 110b) side with respect to a position of each of the stepped portions (117 and 118), the widthwise length being smaller than a widthwise length in a region between both the stepped portions (117 and 118), and in which the tube further includes a drainage portion (119) at a predetermined position between both the stepped portions (117 and 118) along the refrigerant flowing direction.

Abstract: The thermal efficiency of a heat exchanger which is disposed on a blowing path in a vehicle interior and operates as a condenser is enhanced.

Abstract: The present invention relates to a heat exchanger capable of maintaining adhesion between fins and a heat exchange tube while achieving corrosion protection of the heat exchange tube, and a method for producing the heat exchanger. In the heat exchanger which includes a heat exchange tube 4 and a plate-like fin 5 having a through-hole 5a through which the heat exchange tube 4 passes, the plate-like fin 5 has a three-layer structure including a core material layer 52 formed of an Al—Mn based alloy, a brazing material layer 51 that constitutes one end surface and is formed of an Al—Si based alloy, and a sacrificial corrosion layer 53 that constitutes the other end surface and is formed of an Al—Zn—Mg based alloy, and has a tubular portion 5b which is raised from a periphery of the through-hole 5a and uses the brazing material layer 51 as an inner peripheral surface.

Abstract: Assembly of a header tank 1 and flat tubes 3A in a heat exchanger is simplified. A communication portion of the header tank 1 side which communicates with the flat tube 3A is a slit 11 formed over a region (a side surface 1b, or a connection portion between a facing surface 1a and the side surface 1b) that retreats from a center portion side in a width direction of the facing surface 1a, from the facing surface 1a on one end portion side in the width direction. An end portion of the flat tube 3A is able to be inserted from the side surface side of the header tank 1 into the slit 11 of the header tank 1. The flat tube 3A is caused to abut, in the width direction thereof, on a first abutting portion a of an end portion on the facing surface 1a side of the slit 11, and abut, in the longitudinal direction, on a second abutting portion b of an end portion on the side surface 1b side of the slit 11.

Abstract: Disclosed is a refrigeration circuit in which a scroll compressor is used as a compressor, an unsaturated fluorinated hydrocarbon refrigerant is used as a refrigerant, and an ether-based lubricant such as a polyalkylene glycol is used as a refrigeration machine oil, and wherein a wax-like solid material, which causes clogging of the refrigeration circuit or deterioration of the refrigeration performance, is prevented from being generated. Specifically, a wax-like solid material is prevented from being generated in a refrigeration circuit by adding a lubricant type component having no polyoxyalkylene structure such as an ester-based lubricant, an alcohol-based friction modifier, an olefin-based friction modifier, a polyolefin-based lubricant, an alkyl aromatic lubricant or a silicone-based lubricant, or a metal deactivation agent such as benzotriazole to an ether-based lubricant such as a polyalkylene glycol.