Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Patent
1986-08-13
1988-06-14
Lazarus, Ira S.
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
165178, 2851371, F28F 300
Patent
active
047505559
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device in a frame plate for a plate heat exchanger, wherein two tubes provided with annular flanges and intended for heat exchanging media are connected with the frame plate such that the interior of each tube is in communication with a respective port in the frame plate, the distance between the centres of the ports, seen in the plane of the outer side of the frame plate, being smaller than the sum of the outer radii of the tube flanges and, therefore, the tube flanges being arranged at different distances from the frame plate.
A plate heat exchanger consists basically of a package of heat exchange plates, which are held together between one fixed and one movable frame plate. The heat exchange plates have a number of ports situated aligned with each other, such that the ports together form inlet and outlet channels through the plate package for two heat exchanging media. Usually the ports in each plate, for instance four, are arranged in pairs, two at the top and two at the bottom of the plate.
For each pair of ports in the heat exchange plates, there is a corresponding pair of ports provided in a frame plate, which latter ports are connected to two tubes for transfer of the heat exchanging media. The tubes are attached to the frame plate by means of annular flanges arranged at the tube ends. The tube flanges can either be welded directly on the tubes or loosely fitted around them and abutting against smaller stop flanges, which are fixed to the tube ends.
It has proved that at certain small heat exchangers, having a width of only a few decimeters, there has been a problem that the ports in the frame plate are situated so close to each other, that there is no room for a side by side arrangement of the tube flanges of the connecting tubes.
In a known device (see FIGS. 1 and 2), which solves the above-mentioned problem, the tube connections have been arranged such that the tube flanges are situated at different distances from the frame plate. Hereby, the tube flanges can overlap each other radially without interference. The known device comprises a joint pipe, which has an annular flange at one end adapted to be connected to a tube flange, and which is fixed at its other end, for instance welded to the frame plate.
In spite of the fact that the known device in a seemingly simple way solves the above described problem, it is associated with certain drawbacks making it expensive to produce. One drawback is that the consumption of expensive material is large. Since the kind of heat exchangers here concerned is mainly intended for aggressive media, the joint pipe and its flange must be made of an expensive, stainless material, usually stainless steel or titanium. Further, the joint pipe must be able to resist strains caused by the heat exchanging medium and the connected pipe, so the wall of the joint pipe must be made comparatively thick. In addition, the joint pipe should have such a length that there is room for mounting tools between the flange of the joint pipe and the outer side of the frame plate.
Another drawback is that a number of price raising machining operations are required for the production of the known device. The said annular flange is thus welded to the joint pipe. Further, the frame plate has a considerable thickness, because it must be able to resist pressure from the compressed heat exchange package without bulging. For cost reasons the frame plate is made of an inexpensive material, and in order that the frame plate within the port will be protected against aggressive media, the stainless joint pipe is arranged such that it extends through the port to the inner side of the frame plate. The joint pipe must be fixed within the port and, therefore, has a further flange welded at the end. The further flange is in turn welded to the inner side of the frame plate.
The said further flange must be given a certain thickness for reasons of strength. In order to avoid problems due to deflection of the heat exchange plate located nearest to the frame plate, an annul
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Ahl Thomas
Peterson Torsten
Alfa-Laval Thermal AB
Lazarus Ira S.
Neils Peggy
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