Patent ID: 6206603
Filing Date: 2001-03-27
Classification: F28F,Y10S,Y10T

Abstract:
An all-ceramic ball joint for use in an all-ceramic, air to air, indirect heat exchanger, said ball joint comprising a spherical body having an outer surface and an inner surface and having a near side and a tube side, said near side having a truncated face to form a flat surface on said near side; said spherical body having a first opening through it from the near side through the tube side;said tube side having a truncated face to form a flat surface on said tube side; said tube side having a second opening in alignment with and larger than the first opening to form a shoulder within said second opening to accommodate a ceramic tube therein;said second opening having a near end and a distal end, said second opening having an inside surface, said inside surface being beveled in a line from near the near end to the distal end thereof, the angle of bevel being from about 2 degrees to about 6 degrees from a plane formed by the outside surface of the ceramic tube placed therein;said outer surface of said spherical body being covered with a smooth, refractory ceramified, frit glaze.