Integrated lightweight card rack

摘要

A plurality of heat sinks assembled to form a rack in a lightweight box accommodate printed circuit cards between the heat sinks and circulate cooling oil through the heat sinks to drain the test heat from the boards quickly. Each heat sink includes a porous metal foam core configured in zigzag shape to provide a tortuous path for the fluid flow which extends into lateral fins comprising the side plates of the metal foam for receiving the cards or ground plates therefore. These plates are clamped against the fins for close contact to the cooling fluid thereby shortening the heat flow path. Brazed on aluminum top and bottom cover plates make a fluid tight connection with the porous metal. The brazed on top and bottom plates are also configured in the zigzag pattern of the foam. Lightweight thin aluminum feelers or plates conform to the zigzag sides of the foam and are clamped there against by side covers so that the feelers melt in a brazing process for sealing the side covers in fluid tight core conforming relationship with the foam metal core. After brazing the side covers have milled uniform slots formed along their exteriors for receiving the boards which are clamped against one side of the so-formed fins by wedge locking devices.