Heat exchange – Conduit within – or conforming to – panel or wall structure
Patent
1997-10-24
2000-07-18
Leo, Leonard
Heat exchange
Conduit within, or conforming to, panel or wall structure
165 804, 165170, 257714, 361699, F28F 312, H05K 720
Patent
active
060893141
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a cooling body for cooling power gates.
The cooling of power gates by means of cooling bodies in the form of so-called cooling rails is known. The cooling agent flows in longitudinal direction through the cooling ducts and thus removes the heat due to energy losses from power gates mounted to the outside of the cooling body. Since the characteristic data for the components depend strongly on the temperature, the aim is not to exceed a maximum temperature gradient of 5 K in longitudinal direction on the cooling surface.
The Patent DE-C-39 08 996 discloses a ceramic cooling body with a plurality of cooling ducts inside the cooling body, wherein the flow through neighboring cooling ducts inside the cooling body is in part parallel and in part antiparallel. The disadvantage of the arrangements is that the heat removal is insufficient. A large temperature gradient forms along the flow direction. The components to be cooled are not on the same temperature level.
WO-A-95/17765 discloses an arrangement where a cooling pipe is pressed into a cooling body in such a way that cross-sectional constrictions develop in the cooling pipe. The disadvantage here is that the flow resistance is increased strongly and the flow does not stall reliably at the constrictions, but can continue to flow laminar. Furthermore, the transition from the cooling body to the pressed-in cooling pipe constitutes an undesired heat resistance, which worsens the cooling.
A cooling rail that is open on both sides is known from DE-A-44 01 607, where a partition with regularly spaced boreholes is placed on the inside of the cooling duct, parallel to the flow direction. The inside of the cooling rail is thereby separated into two cooling ducts. Swirling and flow stall bodies are additionally inserted into each of the two cooling ducts, in order to homogenize and improve the cooling along the duct through the turbulence generated in the cooling agent. However, this measure leads to a drastic increase in the flow resistance in the cooling duct, which cannot be tolerated with the standard high flow speeds in cooling bodies for power gates. The heat resistance between the inserted partition and/or the inserted swirling bodies and the cooling rail furthermore cannot be neglected, so that the partition and the inserts as such hardly contribute to the heat removal.
Cooling bodies for power gates are frequently operated with flow speeds and pressure differences for the cooling agent in the cooling duct that are at the upper performance limit for the cooling body with respect to flow and heat removal.
SUMMARY OF THE INVENTION
It is thus the object of the invention to disclose a cooling body, for which the cooling is improved without resulting in a drastic increase in the flow resistance for the arrangement.
The solution is obtained according to the invention by providing a cooling body having at least one cooling duct for receiving a coolant agent with a predetermined velocity, and an upper and a lower external cooling surface for accepting bodies to be cooled wherein the at least one cooling duct has a nearly constant cross section lengthwise and is provided with at least one flow stall center in the form of boreholes between the cooling ducts that extend lateral to a flow direction, and which in part forms an enlargement of the cooling duct cross section lateral to a flow direction, and wherein the circumferential curve of the total cross section in the region of the enlargement, lateral to the flow direction, has measurements in two dimensions that are larger than the circumferential curve of the cross section outside of the enlargement. Further and advantageous embodiments follow from the description.
The invention starts with the purposeful arrangement of square-edged flow stall centers inside a cooling body, along the cooling duct, in such a way that the flow is stalled reliably. It is preferable if the total cross-section of the cooling duct is enlarged perpendicular to the flow direction at the fl
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Becker Klaus
Heinemeyer Peter
Jung Matthias
Staiger Wolfgang
ABB Daimler Transportation (Deutchland ) GmbH
Daimler-Benz Aktiengesellschaft
Kinberg Robert
Leary Michael P.
Leo Leonard
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