Inner ribbed tube and method
AssigneeHigh Performance Tube, Inc.
InventorJohn M. Keyes
Life of this patent
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Abstract
A heat exchanger inner spiral ribbed tube and method of manufacture therefor for use in making a refrigerator condenser or a refrigerator evaporator. The tube has an annular wall having an inner surface. The inner surface has a plurality of inner spiral ribs, each having a spiral angle. The spiral angle is between 0 degrees and 90 degrees; and is 45 degrees in the described embodiment. The tube making method includes the steps of swaging a plain plate between a plain roller and a grooved roller to make a ribbed plate; then seam welding the plate at the longitudinal adjacent edges thereof to make the inner spiral ribbed tube.
Claims4
A seam welded tube for use in making a refrigerator condenser or a refrigerator evaporator comprising:
- an annular wall having an inner surface and an elongate axis;
- said inner surface having a series of axially spaced inner spiral rib loops;
- said inner spiral rib loops each having a spiral angle formed by a tangent to a point on the rib loop and a longitudinal line through the point and parallel to the elongate axis of the tube;
- said spiral angle having a size in the range between zero degrees and 90 degrees;
- said tube annular wall having adjacent elongate wall portions extending substantially parallel to the elongate axis, and said elongate wall portions having an elongate seam weld therebetween;
- and
- said loops being discontinuous at the seam weld.
Dependencies are inferred from the claim text.