| 摘要 |
<p>An electronics packaging system suitable for the hostile operating environment of downhole MWD tools, which has a «Y»-shaped cross-sectional chassis on the periphery of which are attached a plurality of electronics modules (14a-c, 114a-d) in a «delta» configuration to give a rigid, high-density assembly with convenient cabling channels running axially of the chassis. Roller supports (22) or annular shoe supports (120) provided on the chassis isolate the electronics from the vibration and shock forces experienced by the housing. The metal-elastomer-metal construction of the supports offers the resiliency needed for vibration-dampening and shock absorption, as well as the rigidity needed for rolling and controlling the direction of application of the undissipated forces. Heat sinks are provided both above and below electonics elements to rapidly disseminate localized heat and to radiate heat generally through the housing walls to an external cooling medium, the drilling mud.</p> |
