Abstract: An automotive heat exchanging system has a heat exchanger comprising a condenser and a radiator, an electric fan located in the front of an engine and an automatic transmission. A shroud is attached to and covers peripheral portions of the electric fan and the heat exchanger to prevent air from bypassing the shutter. The shroud forms an air passage inside of it for allowing airflow through the heat exchanger to flow toward the automatic transmission. A shutter is disposed in the shroud and attached at a periphery of the shroud. The shutter is controlled to open and close the air passage by a controller based on oil temperature.

Abstract: A flat tube includes pairs of dimple portions in a longitudinal direction thereof. Each of the pairs has a first dimple portion and a second dimple portion, which are slanted with respect to an intermediate line extending in the longitudinal direction at an intermediate position in a lateral direction so that inner end wall portions of the first and second dimple portions are located on the intermediate line, and so that the outer end wall potions thereof depart from the intermediate line in the lateral direction to be toward outer sides of the tube, respectively. The pairs of dimple portions are set to satisfy a relationship expressed by an inequality: 3?L2/L1?12, where L1 is a longitudinal projection length obtained by projecting one of the first and second dimple portions on the intermediate line, and L2 is a longitudinal pitch between adjacent pairs.

Abstract: A countercurrent heat exchanger includes a pair of heat exchanger cores (1, 2) with multiple tubes (11, 21) and fins (12, 22) which are arranged alternatively and next to each other in its depth direction. One end sides of the tubes (11, 21) of the inflow-side heat exchanger core (1) and the outflow-side heat exchanger core (2) is connected with a U-turn intermediate tank (3), and the other end sides are connected with the inflow-side tank (4) and the outflow-side tank (5) which are separated from each other. The inflow-side tank (4), outflow-side tank (5) and intermediate tank (3) are attached to a vehicle body side so that the heat exchanger cores (1) and (2) can expand and contract with respect to the intermediate tank (3).

Abstract: A countercurrent heat exchanger includes a pair of heat exchanger cores (1, 2) with multiple tubes (11, 21) and fins (12, 22) which are arranged alternatively and next to each other in its depth direction. One end sides of the tubes (11, 21) of the inflow-side heat exchanger core (1) and the outflow-side heat exchanger core (2) is connected with a U-turn intermediate tank (3), and the other end sides are connected with the inflow-side tank (4) and the outflow-side tank (5) which are separated from each other. The inflow-side tank (4), outflow-side tank (5) and intermediate tank (3) are attached to a vehicle body side so that the heat exchanger cores (1) and (2) can expand and contract with respect to the intermediate tank (3).

Abstract: A corrugated fin comprises a first part which is interposed between paired first tubes, a second part which is interposed between paired second tubes and a third part through which the first and second parts are integrally connected. The third part of the corrugated fin is formed with louvers which extend in a direction perpendicular to upper and lower folded edge portions of the first and second parts. Each of the louvers is of a half-louver type including an elongate flat portion which is bent up or down along a lower edge thereof from a major portion of the third part and two generally triangular supporting portions which support longitudinal ends of the elongate flat portion from the major portion.

Abstract: In multi-passage inkjet printing of an image for detecting the deviation of recording medium by changing the angle of stepwise rotation, the formed image can have a black streak or a white streak visually observable depending on the stepwise rotation angle, as shown in the drawings (a) to (g) in FIG. 28. In FIG. 28, at the rotation angle of 87°, neither a black streak nor a white streak was observed visually (FIG. 28(b)). This rotation angle causing no streak is named an optimum rotation angle. The deviation of the paper sheet delivery distance (or occurrence of a black or white streak) depends on the extent of deviation of the de-centered rotation axis D (depending on the position of the center axis D) from the designed center axis C.

Abstract: A corrugated fin comprises a first part which is interposed between paired first tubes, a second part which is interposed between paired second tubes and a third part through which the first and second parts are integrally connected. The third part of the corrugated fin is formed with louvers which extend in a direction perpendicular to upper and lower folded edge portions of the first and second parts. Each of the louvers is of a half-louver type including an elongate flat portion which is bent up or down along a lower edge thereof from a major portion of the third part and two generally triangular supporting portions which support longitudinal ends of the elongate flat portion from the major portion.

Abstract: A corrugated fin comprises a first part which is interposed between paired first tubes, a second part which is interposed between paired second tubes and a third part through which the first and second parts are integrally connected. The third part of the corrugated fin is formed with louvers which extend in a direction perpendicular to upper and lower folded edge portions of the first and second parts. Each of the louvers is of a half-louver type including an elongate flat portion which is bent up or down along a lower edge thereof from a major portion of the third part and two generally triangular supporting portions which support longitudinal ends of the elongate flat portion from the major portion.

Abstract: In a fin forming step, fins of heat exchangers are formed into a connected state where the fins are connected to each other via a parting portion. In a fin attaching step, the fins in the connected state are temporarily attached to the respective heat exchangers. In a fin fixing step, an integrated heat exchanger in which the fins are temporarily attached is passed through a heating oven to braze the fins to the respective heat exchangers. In a fin separating step W4, the fins in the connected state of the respective heat exchangers are separated from each other in the parting portion. Therefore, each of the heat exchangers can independently perform a heat exchanging operation without being affected by heat conduction from the other heat exchanger via the fins.

Abstract: A core structure of an integral heat-exchanger comprises at least two first heat exchanger tubes which extend in parallel with each other; at least two second heat exchanger tubes which extend in parallel with each other, the second heat exchanger tubes juxtaposed with the first heat exchanger tubes; and a corrugated fin including a corrugated first part interposed between the first heat exchanger tubes, a corrugated second part interposed between the second heat exchanger tubes and a flat connection part arranged between the corrugated first and second parts. The corrugated first part of the fin is formed with a plurality of first louvers each extending substantially between the two first heat exchanger tubes. The corrugated second part of the fin is formed with a plurality of second louvers each extending substantially between the two second heat exchanger tubes. The innermost one of the second louvers is positioned away from the innermost end of the corrugated second part of the fin by a given length.

Abstract: In a fin forming step, fins of heat exchangers are formed into a connected state where the fins are connected to each other via a parting portion. In a fin attaching step, the fins in the connected state are temporarily attached to the respective heat exchangers. In a fin fixing step, an integrated heat exchanger in which the fins are temporarily attached is passed through a heating oven to braze the fins to the respective heat exchangers. In a fin separating step W4, the fins in the connected state of the respective heat exchangers are separated from each other in the parting portion. Therefore, each of the heat exchangers can independently perform a heat exchanging operation without being affected by heat conduction from the other heat exchanger via the fins.

Abstract: A automotive heat exchanging system has a heat exchanger comprising a condenser and the radiator, an electric fan located in the front of an engine and an automatic transmission. A shroud is attached to and covers peripheral portions of the electric fan and the heart exchanger to prevent air from bypassing the shutter. The shroud forms an air passage inside of it for allowing airflow through the heat exchanger to flow toward the automatic transmission. A shutter is disposed in the shroud and attached at a periphery of the shroud. The shutter is controlled to open and close the air passage by a controller based on oil temperature.

Abstract: In a cooling system for a water-cooled internal combustion engine and a control method applicable to the control system, a pump to circulate a coolant to the water-cooled engine and a heat exchanger is drivingly controlled in such a manner that, when a temperature of the coolant detected by a temperature detector indicates a value higher than a predetermined target temperature, a flow state of the coolant circulated within a plurality of tubes arranged within the heat exchanger falls within a predetermined range including at least one of a transition range between a laminar flow range and a turbulence flow range and a part of the turbulence flow range which is placed in vicinity to the transition range (corresponding to 1800 through 6000 in Reynolds number) and the coolant is circulated through the pump into the water-cooled engine and the heat exchanger by a predetermined flow quantity.

Abstract: In a fin forming step, fins of heat exchangers are formed into a connected state where the fins are connected to each other via a parting portion. In a fin attaching step, the fins in the connected state are temporarily attached to the respective heat exchangers. In a fin fixing step, an integrated heat exchanger in which the fins are temporarily attached is passed through a heating oven to braze the fins to the respective heat exchangers. In a fin separating step W4, the fins in the connected state of the respective heat exchangers are separated from each other in the parting portion. Therefore, each of the heat exchangers can independently perform a heat exchanging operation without being affected by heat conduction from the other heat exchanger via the fins.

Abstract: In a cooling system for a water-cooled internal combustion engine and a control method applicable to the control system, a pump to circulate a coolant to the water-cooled engine and a heat exchanger is drivingly controlled in such a manner that, when a temperature of the coolant detected by a temperature detector indicates a value higher than a predetermined target temperature, a flow state of the coolant circulated within a plurality of tubes arranged within the heat exchanger falls within a predetermined range including at least one of a transition range between a laminar flow range and a turbulence flow range and a part of the turbulence flow range which is placed in vicinity to the transition range (corresponding to 1800 through 6000 in Reynolds number) and the coolant is circulated through the pump into the water-cooled engine and the heat exchanger by a predetermined flow quantity.

Abstract: A corrugated fin comprises a first part which is interposed between paired first tubes, a second part which is interposed between paired second tubes and a third part through which the first and second parts are integrally connected. The third part of the corrugated fin is formed with louvers which extend in a direction perpendicular to upper and lower folded edge portions of the first and second parts. Each of the louvers is of a half-louver type including an elongate flat portion which is bent up or down along a lower edge thereof from a major portion of the third part and two generally triangular supporting portions which support longitudinal ends of the elongate flat portion from the major portion.

Abstract: There is disclosed an ink jet cartridge comprising an ink jet head including a plurality of arranged discharge ports for discharging ink, an element substrate provided with a plurality of energy generating elements for generating an energy to discharge the ink, and a base plate for supporting the element substrate; an ink tank holding member for holding an ink tank for containing the ink; and a head holding member for connecting the ink tank holding member to the ink jet head, and by holding the ink jet head by the ink tank holding member and the head holding member, the ink jet head is elastically supported in a head sandwiching direction, so that the positioning of the ink jet head can easily be performed with respect to the ink jet cartridge with a high precision, the high quality recording is possible, and the ink jet apparatus using this cartridge can be realized with a simple construction and at a low cost.

Abstract: A core structure of an integral heat-exchanger comprises at least two first heat exchanger tubes which extend in parallel with each other; at least two second heat exchanger tubes which extend in parallel with each other, the second heat exchanger tubes juxtaposed with the first heat exchanger tubes; and a corrugated fin including a corrugated first part interposed between the first heat exchanger tubes, a corrugated second part interposed between the second heat exchanger tubes and a flat connection part arranged between the corrugated first and second parts. The corrugated first part of the fin is formed with a plurality of first louvers each extending substantially between the two first heat exchanger tubes. The corrugated second part of the fin is formed with a plurality of second louvers each extending substantially between the two second heat exchanger tubes. The innermost one of the second louvers is positioned away from the innermost end of the corrugated second part of the fin by a given length.