Abstract: A heat exchange tube is formed by using a sheet member not clad with a brazing material layer, with bonding regions at which ends of the sheet member are overlapped and brazed by using a brazing material. This structure reduces the extent to which the brazing material becomes dispersed while the heat exchange tube is brazed and the likelihood of dissolution due to erosion, which makes it possible to assure the desired product quality, such as corrosion resistance, even when a tube material with a smaller wall thickness is used.

Abstract: A heat exchange tube is formed by using a sheet member not clad with a brazing material layer, with bonding regions at which ends of the sheet member are overlapped and brazed by using a brazing material. This structure reduces the extent to which the brazing material becomes dispersed while the heat exchange tube is brazed and the likelihood of dissolution due to erosion, which makes it possible to assure the desired product quality, such as corrosion resistance, even when a tube material with a smaller wall thickness is used.

Abstract: A heat exchanger adopts a four-pass structure, including two rows of tubes, a first upper tank portion communicating with the upper end of one of the tube rows, a second upper tank portion communicating with the upper end of the other tube row, a first lower tank portion communicating with the lower end of the one tube row, a second lower tank portion communicating with the lower end of the other tube row, a communicating passage that communicates between first ends of the first and second upper tank portions a partition partitioning each of the first and second upper tank portions, inflow and outflow ports communicating with the other ends of the first and second upper tank portions. The inflow port opening is smaller and has a higher center than the outflow port opening.

Abstract: In order to achieve a uniform temperature distribution with a high level of efficiency while minimizing any increase in production cost, a heat exchanger adopts a four-pass structure, comprising a plurality of tubes disposed so as to distribute a coolant along a top-bottom direction over two rows to the front and rear along the direction of airflow, a first upper tank portion communicating with the upper end of the group of tubes disposed in one of the tube rows, a second upper tank portion communicating with the upper end of the group of tubes disposed in the other tube row, a first lower tank portion communicating with the lower end of the group of tubes disposed in the one tube row, a second lower tank portion communicating with the lower end of the group of tubes disposed in the other tube row, a communicating passage that communicates between one end of the first upper tank portion and one end of the second upper tank portion, a partitioning means for partitioning the first upper tank portion and the sec

Abstract: In tubular portion of a tank, slits are formed in each side face of chambers or across all side faces of the chambers. For partition plates that are to be inserted from the slits, groove portions in which the partition plates are fitted are formed by cutting portions to which the partition plates butt. The slits are formed in the chambers at positions relatively shifted from each other in a direction in which tubes are layered. This structure guarantees that, in the tank for a heat exchanger, bypass leakage of a heat exchange medium between sub-chambers is prevented from occurring when the partition plates are inserted in the tank from the slits provided on the tank side faces. Further, the tank can maintain required strength even if the slits are formed in it.

Abstract: A heat exchange tube 4 is formed by using a sheet member not clad with a brazing material layer, with bonding margins 4d at which ends of the sheet member are overlapped and brazed by using a brazing material. This structure reduces the extent to which the brazing material becomes dispersed while the heat exchange tube is brazed and the likelihood of dissolution due to erosion, which makes it possible to assure the desired product quality such as corrosion resistance even when a tube material with a smaller wall thickness is used.

Abstract: A tube for a heat exchanger which has beads (21) formed on a brazing sheet (B) for configuring a tube (2) and tops of the beads brazed with opposed portions within a tube part (20) and a method for manufacturing the tube. The tube part (20) prior to brazing is determined to have a thickness (t′) larger than a predetermined thickness (t) and compressed in a direction of its thickness when it is brazed, and the tube which has tops of the beads crushed against or lodged in opposed portions within the tube part. Also a method for manufacturing the tube which can braze the tops of the beads with the opposed portions within the tube more securely and firmly than before.

Abstract: A heat exchanger is comprising a core which is consisting of tubes provided with medium passages and fins fitted to the tubes, and tanks to which ends of the tubes are connected, wherein the tube (2) is formed to have a flat cross-sectional shape by joining ends of one or two plates, the ends of the plates have a contact portion which is formed by bending at least one of the plate ends a plurality of times and overlaying the one end on the other end, and the contact portion is provided with a joint portion (2c) which is formed by placing a part (2e) of the contact portion on the top or bottom flat surface and mutually engaging the both ends of the plate.

Abstract: The upstream side ends of fins (16) along the ventilating direction project out relative to the upstream side ends along the ventilating direction of tubes (14) without being allowed to project out beyond the end faces of tanks (2) and (3) along the ventilating direction so as to set the tubes (14) at positions recessed toward the downstream side along the ventilating direction relative to the fins (16), and the downstream side ends of the fins (16) along the ventilating direction are recessed further toward the upstream side along the ventilating direction relative to the downstream side ends of tubes (15) along the ventilating direction.

Abstract: A tube for a heat exchanger which is formed to have beads for dividing passages for a medium in the tube by roll forming, wherein base portions of the beads are formed to have a thickness (B) greater than a thickness of a plate material for the tube. The roll forming has a first step of sequentially bending the plate to have a depressed shape to form portions-to-be-bead which are to be intermediate forms of the beads, a second step of performing a width drawing of the portions-to-be-bead and a third step of compressing the portions-to-be-bead, after the second step, in a direction of the height of the beads, wherein a width (w′) of the depressions of the portions-to-be-bead (21a) in the first step is larger than a width (w) of depressions of beads (21) after forming, and a height (h′) of portions-to-be-bead (21b) after the second step is determined to be higher than a height (h) of the beads (21) after forming.

Abstract: A heat exchanger comprises a plurality of tubes layered with fins intervened between them, header pipes disposed on the end portions of the tubes, and side plates for holding the tube layer, wherein each of the side plates (8) is connected to a side plate insertion hole (10) formed on the header pipe (3) or (4) by inserting its end portion (82) into the side plate insertion hole and forming a taper on the end portion (82) of the side plate (8) to decrease a thickness toward the leading end (82a). The end portions (82) of the side plates (8) are tapered toward the leading ends to decrease a width, contact portions (81a) are formed on the side plate to contact with the outer surface of the header pipes (3), (4), and the contact portions are brazed with the outer surface of the header pipe. Further, a stopper means is formed on the end portions of the side plates to prevent the end portions of the side plates from coming out of the side plate insertion holes (10).

Abstract: A tube for a heat exchanger which is formed to have beads for dividing passages for a medium in the tube by roll forming, wherein base portions of the beads are formed to have a thickness (B) greater than a thickness of a plate material for the tube. The roll forming has a first step of sequentially bending the plate to have a depressed shape to form portions-to-be-bead which are to be intermediate forms of the beads, a second step of performing a width drawing of the portions-to-be-bead and a third step of compressing the portions-to-be-bead, after the second step, in a direction of the height of the beads, wherein a width (w′) of the depressions of the portions-to-be-bead (21a) in the first step is larger than a width (w) of depressions of beads (21) after forming, and a height (h′) of portions-to-be-bead (21b) after the second step is determined to be higher than a height (h) of the beads (21) after forming.

Abstract: In a laminated heat exchanger, an intake portion and an outlet portion for heat exchanging medium are provided at one end portion in the direction of lamination. The intake portion is made to communicate with a most upstream pass distance from the one end portion in the direction of lamination via a communicating pipe, and the outlet portion is made to communicate with the most downstream pass at one end portion in the direction of lamination. The communicating pipe is further made to communicate with an odd-numbered pass in the vicinity where the odd-numbered pass changes from the even-numbered pass that immediately precedes it. In addition, the intake portion at one end portion in the direction of lamination is made to communicate with the pass immediately preceding the most downstream pass.

Abstract: A heat exchanger that a tube member 2' has beads 21 protruded from the face of one plate toward the other plate, tube member 2' is held by block members 31, 31, a forming jig 40 is inserted between medium passages 24, 24 formed by the beads 21 to hold to press the beads 21 at an end 2a of the tube member 2' to mutually adhere the faces of the beads 21 on the outer face of the tube member 2', and recesses formed by the mutually contacted faces of the beads 21, 21 have a cross-sectional area of about 0.2 mm.sup.2 or below. And, a region where the recesses have a cross-sectional area of about 0.2 mm.sup.2 or below is within 10 mm outside header pipes 3, 4.

Abstract: In a laminated heat exchanger, an intake portion and an outlet portion for heat exchanging medium are provided at one end portion in the direction of lamination. The intake portion is made to communicate with a most upstream pass distance from the one end portion in the direction of lamination via a communicating pipe, and the outlet portion is made to communicate with the most downstream pass at one end portion in the direction of lamination. The communicating pipe is further made to communicate with an odd-numbered pass in the vicinity where the odd-numbered pass changes from the even-numbered pass that immediately precedes it. In addition, the intake portion at one end portion in the direction of lamination is made to communicate with the pass immediately preceding the most downstream pass.

Abstract: In a laminated heat exchanger, an intake portion and an outlet portion for heat exchanging medium are provided at one end portion in the direction of lamination. The intake portion is made to communicate with a most upstream pass distanced from the one end portion in the direction of lamination via a communicating pipe, and the outlet portion is made to communicate with the most downstream pass at one end portion in the direction of lamination. The communicating pipe is further made to communicate with an odd-numbered pass in the vicinity where the odd-numbered pass changes from the even-numbered pass that immediately precedes it. In addition, the intake portion at one end portion in the direction of lamination is made to communicate with the pass immediately preceding the most downstream pass.

Abstract: An air conditioning system for an automotive vehicle has a central air outlet, and a pair of left and right air outlets arranged at left and right sides of said central air outlet, which are provided at least one of front and rear portions of the vehicle compartment. A center vent passage extends from a first diverging point and leads to the central air outlet. A side vent passage extends from the first diverging point in a manner separated from the center vent passage and leads to the left and right air outlets. The side vent passage has a pair of left-hand and right-hand vent passages extending from a second diverging point located at a different position from the first diverging point and leading to the left and right outlets, respectively. A flow rate ratio-adjusting door is arranged at the second diverging poing for adjusting the ratio between the flow rates of air delivered into the left-hand and right-hand vent passages.

Abstract: An automobile air conditioner includes a duct interconnecting a blower unit and a temperature control/air distributing unit having a pair of cooling and heating heat exchangers, the duct having a cross-sectional area gradually increasing toward the temperature control/air distributing unit. The air conditioner preferably has a hot/refrigeration compartment juxtaposed with the duct. In a preferred embodiment, the air conditioner includes a hot air control mode door for controlling a stream of hot air flowing from the heating heat exchanger toward an upper air outlet and a lower air outlet.

Abstract: An air conditioner for automobiles includes a pair of juxtaposed air flow passages commonly containing blowers and heat exchangers. Each of the air flow passages is provided with a bypass door and an air distribution door. At least one of the bypass door and the air distribution door in one air flow passage is operative independently of the bypass door and the air distribution door in the other air flow passage so that the temperature of air flowing through one air flow passage can be controlled independently of the temperature of air flowing through the other air flow passage.

Abstract: An automobile air conditioner includes a duct interconnecting a blower unit and a temperature control/air distributing unit having a pair of cooling and heating heat exchangers, the duct having a cross-sectional area gradually increasing toward the temperature control/air distributing unit. The air conditioner preferably has a hot/refrigeration compartment disposed in juxtaposition with the duct. In a preferred embodiment, the air conditioner includes a hot air control mode door for controlling a stream of hot air flowing from the heating heat exchanger toward an upper air outlet and a lower air outlet.