Heat exchanger rib

In a ribbed-tube heat exchanger for a motor vehicle having a plurality of spaced ribs for joint ribbing of a plurality of heat exchanger tubes wherein ambient air, as a first heat exchange fluid, flows in a given direction along a surface of the ribs and a second heat exchange fluid is conducted in the heat exchanger tubes, with said ribs being made of aluminum or an aluminum alloy and being corrugated in the direction of flow of the first fluid, whereby wave crests and wave troughs of the corrugations extend transverse to the direction of flow of the first fluid, and further including connecting sleeves, connecting a respective said rib to the heat exchanger tubes, fastened and shaped to the respective said rib and disposed such that at least one wave crest of the corrugations extends between two of said connecting sleeves which are disposed adjacent one another transversely to the flow direction of the first fluid, and local air guidance profiles shaped in the corrugated surface of the respective said rib in the spaces between said connecting sleeves;

• the improvement wherein:
• said air guidance profiles are constituted of at least predominantly closed bulges, each of a height of at least 15% and at most 80% of the spacing between adjacent said ribs in the ribbed-tube heat exchanger;
• and, on a respective said rib, each said bulge is disposed on a slope of the corrugation and is spaced from both ends of the slope in the direction of air flow, said corrugation has a periodic linear zigzag course whose pitch angle (.theta.) lies in a range from 10.degree. to 30.degree., and a group of at least two of said bulges is arranged on the same slope and transversely to the direction of flow of the first fluid between a pair of said connecting sleeves which are adjacent one another transversely to the flow direction of the first fluid.

In a ribbed-tube heat exchanger for a motor vehicle having a plurality of spaced ribs for joint ribbing of a plurality of heat exchanger tubes wherein ambient air, as a first heat exchange fluid, flows in a given direction along a surface of the ribs and a second heat exchange fluid is conducted in the heat exchanger tubes, with said ribs being made of aluminum or an aluminum alloy and being corrugated in the direction of flow of the first fluid, whereby wave crests and wave troughs of the corrugations extend transverse to the direction of flow of the first fluid, and further including connecting sleeves, connecting a respective said rib to the heat exchanger tubes, fastened and shaped to the respective said rib and disposed such that at least one wave crest of the corrugations extends between two of said connecting sleeves which are disposed adjacent one another transversely to the flow direction of the first fluid, and local air guidance profiles shaped in the corrugated surface of the respective said rib in the spaces between said connecting sleeves;

• the improvement wherein:
• said air guidance profiles are constituted of at least predominantly closed bulges, each of a height of at least 15% and at most 80% of the spacing between adjacent said ribs in the ribbed-tube heat exchanger;
• and, on a respective said rib, said corrugation has a periodic linear zigzag course whose pitch angle (.theta.) lies in a range from 10.degree. to 30.degree., each said bulge is disposed on a slope of the corrugation and is spaced from both ends of the slope in the direction of air flow, and a greater number of said bulges are provided in regions having broad flow cross sections for the first fluid between adjacent said connecting sleeves, and fewer or no bulges are provided in regions having a smaller flow cross section for the first fluid between adjacent said connecting sleeves.

In a ribbed-tube heat exchanger for a motor vehicle having a plurality of spaced ribs for joint ribbing of a plurality of heat exchanger tubes wherein ambient air, as a first heat exchange fluid, flows in a given direction along a surface of the ribs and a second heat exchange fluid is conducted in the heat exchanger tubes, with said rib being made of aluminum or an aluminum alloy and being corrugated in the direction of flow of the first fluid, whereby wave crests and wave troughs of the corrugations extend transverse to the direction of flow of the first fluid, and further including connecting sleeves, connecting a respective said rib to the heat exchanger tubes, fastened and shaped to the respective said rib and disposed such that at least one wave crest of the corrugations extends between two of said connecting sleeves which are disposed adjacent one another transversely to the flow direction of the first fluid, and local air guidance profiles shaped in the corrugated surface of the respective said rib in the spaces between said connecting sleeves;

• the improvement wherein:
• said air guidance profiles are constituted of at least predominantly closed conically shaped bulges, each of a height of at least 15% and at most 80% of the spacing between adjacent said ribs in the ribbed-tube heat exchanger;
• and, on a respective said rib, each said bulge is disposed on a slope of the corrugation and is spaced from both ends of the slope in the direction of air flow, and the distance (a) between the centers of adjacent said bulges in the same one of said corrugation slopes between two adjacent said connecting sleeves and in a direction transverse to the flow direction is 1 to 3 times, preferably 1.3 to 2 times, the diameter of the base surface of the individual said bulges.

In a ribbed-tube heat exchanger for a motor vehicle having a plurality of spaced ribs for joint ribbing of a plurality of heat exchanger tubes wherein ambient air, as a first heat exchange fluid, flows in a given direction along a surface of the ribs and a second heat exchange fluid is conducted in the heat exchanger tubes, with said ribs being made of aluminum or an aluminum alloy and being corrugated in the direction of flow of the first fluid, whereby wave crests and wave troughs of the corrugations extend transverse to the direction of flow of the first fluid, and further including connecting sleeves, connecting a respective said rib to the heat exchanger tubes, fastened and shaped to the respective said rib and disposed such that at least one wave crest of the corrugations extends between two of said connecting sleeves which are disposed adjacent one another transversely to the flow direction of the first fluid, and local air guidance profiles shaped in the corrugated surface of the respective said rib in the spaces between said connecting sleeves;

• the improvement wherein:
• said air guidance profiles are constituted of at least predominantly closed bulges, each of a height of at least 15% and at most 80% of the spacing between adjacent said ribs in the ribbed-tube heat exchanger;
• and, on a respective said rib, each said bulge is disposed on a slope of the corrugation and is spaced from both ends of the slope in the direction of air flow, and the length of the individual said slopes of said corrugation in the flow direction of the first-fluid is at least two and at most five times the spacing (b) between adjacent said ribs in the ribbed-tube heat exchanger.

In a ribbed-tube heat exchanger for a motor vehicle having a plurality of spaced ribs for joint ribbing of a plurality of heat exchanger tubes wherein ambient air, as a first heat exchange fluid, flows in a given direction along a surface of the ribs and a second heat exchange fluid is conducted in the heat exchanger tubes, with said ribs being made of aluminum or an aluminum alloy and being corrugated in the direction of flow of the first fluid, whereby wave crests and wave troughs of the corrugations extend transverse to the direction of flow of the first fluid, and further including connecting sleeves, connecting a respective said rib to the heat exchanger tubes, fastened and shaped to the respective said rib and disposed such that at least one wave crest of the corrugations extends between two of said connecting sleeves which are disposed adjacent one another transversely to the flow direction of the first fluid, and local air guidance profiles shaped in the corrugated surface of the respective said rib in the spaces between said connecting sleeves;

• the improvement wherein:
• said air guidance profiles are constituted of at least predominantly closed bulges, each of a height of at least 15% and at most 80% of the spacing between adjacent said ribs in the ribbed-tube heat exchanger;
• and, on a respective said rib, each said bulge is disposed on a slope of the corrugation and is spaced from both ends of the slope in the direction of air flow, and three of said slopes of the corrugation are provided for each row of said connecting sleeves arranged next to one another transversely to the flow direction of the first fluid.

In a ribbed-tube heat exchanger for a motor vehicle having a plurality of spaced ribs for joint ribbing of a plurality of heat exchanger tubes wherein ambient air, as a first heat exchange fluid, flows in a given direction along a surface of the ribs and a second heat exchange fluid is conducted in the heat exchanger tubes, with said ribs being made of aluminum or an aluminum alloy and being corrugated in the direction of flow of the first fluid, whereby wave crests and wave troughs of the corrugations extend transverse to the direction of flow of the first fluid, and further including connecting sleeves, connecting a respective said rib to the heat exchanger tubes, fastened and shaped to the respective said rib and disposed such that at least one wave crest of the corrugations extends between two of said connecting sleeves which are disposed adjacent one another transversely to the flow direction of the first fluid, and local air guidance profiles shaped in the corrugated surface of the respective said rib in the spaces between said connecting sleeves;

• the improvement wherein:
• said air guidance profiles are constituted of at least predominantly closed bulges, each of a height of at least 15% and at most 80% of the spacing between adjacent said ribs in the ribbed-tube heat exchanger;
• on a respective said rib, each said bulge is disposed on a slope of the corrugation and is spaced from both ends of the slope in the direction of air flow;
• the respective free ends of said connecting sleeves are provided with respective collars;
• the side surface of a respective said rib facing away from said collars of said connecting sleeves is provided with complementary annular receiving troughs for the collars of an adjacent rib;
• and the width of said troughs is less than one-half of the corrugation slope length.