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HEAT PIPE COOLING SYSTEMS – Type 1200/50 DESCRIPTION
This type of Heat Pipe Cooler has been designed to meet the general
specification prepared by one of our customers, regarding the cooling of an IGBT inverter
for application on railway vehicles, mounted underflloor with fins oriented in a parallel
plane to the moving direction.
OPERATION
The heat produced by IGBT modules, mounted on a base plate, is carried,
by means of 6 "U" shaped heat pipes, to a radiating section composed by 29
couples of fins mechanically housed on the heat pipes. Fins in turn dissipate the heat
into the ambient, through a natural air convection.
The particular shape of the cooler also provides a very high efficiency
with the forced air, caused by the movement of the train (assisted ventilation).
CONSTRUCTION
The sample unit presented here basically consists of:
- A base plate made of Aluminum alloy, machined on one face to house the lower leg of the
heat pipes by means of brazings or mechanical clamping, and on the other face to allow the
mounting of IGBT modules and Diodes by means of tapped threaded holes. On this same
surface a groove for housing a gasket can be provided.
- A series of 6 heat pipes made of Copper, housed and soldered to the base plate by means
of a special soldering alloy. Thermocarrying fluid can be demineralised water or
fluorinert. Pipes are inclined of 10° over the horizontal line to allow an operation mode
gravity assisted.
- A dissipating section consisting of 29 couples of fins made of Aluminum alloy, each
having dimensions of 420x135x1 mm. Fins are separated in order to provide a better flow of
the cooling air. Fins have six holes each to match the pipes size and are inserted on the
pipes with a mechanical interference.
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