Back to results
US 6,779,593 B1Granted
High performance cooling device with heat spreader
AssigneeHewlett-Packard Development Company, L.P.
InventorShankar Hegde
Life of this patent
Estimating the term…
Abstract
A low-cost, fan assisted cooling device is disclosed. The cooling device includes a heat mass with a taper bore therein adapted to receive a heat spreader that has a shape that complement the taper bore. The heat mass and the heat spreader are made from dissimilar materials. A fastener or the like can be used to urge the heat spreader and the mass into contact with each other. A plurality of vanes are connected with the heat mass and an inside surface of the vanes define a chamber that surrounds the heat mass. A portion of each vane is split into a plurality of fins and both the vanes and the fins have a surface area that increase in a radially outward direction from the axis of the heat mass.
Claims32
A cooling device for dissipating heat from a component, comprising:
- a heat mass made from a first material and including a base, a boss including a convex arcuate surface profile and a groove surrounding the boss and having a concave arcuate surface profile, the groove and the boss are symmetrically positioned about an axis of the heat mass, a taper bore extending from the base to the boss, and an aperture extending from the boss to the taper bore;
- a fastener including head and a threaded shaft, the fastener is inserted through the aperture with the head in contact with the boss;
- a heat spreader made from a second material that is dissimilar to the first material, the heat spreader including a taper wall with a profile that complements the taper bore, a mounting surface adapted to thermally connect the heat spreader with the component, and a threaded aperture adapted to receive the threaded shaft;
- and
- a plurality of vanes in contact with the heat mass and spaced apart to define a primary slot therebetween that extends to the heat mass, the vanes have a surface area that increases in a radially outward direction from the axis,
- the vanes including a top face, an aerodynamically profiled inner wall including a first portion extending from the groove and terminating at a second portion that extends to the top face, the inner walls of the vanes defining a chamber that surrounds the groove, an outer wall having a surface profile that widens from the base of the heat mass to the top face and includes therebetween a smooth curved portion, a draft portion, and a smooth radially outward portion, and
- the vanes including at least one secondary slot extending through a portion of each vane to define a plurality of fins in each vane, and
- wherein an air flow entering the chamber exits through the primary slots and a bottom portion of the secondary slots in an exhaust flow that dissipates heat from the vanes and the fins, the exhaust flow creates a low pressure region within the chamber that induces an intake flow into the chamber through the secondary slots and a top portion of the primary slots thereby dissipating heat from the fins and the vanes, and the low pressure region induces a surface flow along the first and second portions of the inner wall so that the surface flow passes over the groove and the boss to dissipate heat from the heat mass.
5 more elements
A system for dissipating heat, comprising:
- a cooling device including:
- a heat mass made from a first material and including a base, a boss including a convex arcuate surface profile and a groove surrounding the boss and having a concave arcuate surface profile, the groove and the boss are symmetrically positioned about an axis of the heat mass, a taper bore extending from the base to the boss, and an aperture extending from the boss to the taper bore;
- a fastener including head and a threaded shaft, the fastener is inserted through the aperture with the head in contact with the boss;
- a heat spreader made from a second material that is dissimilar to the first material, the heat spreader including a taper wall with a profile that complements the taper bore, a mounting surface adapted to thermally connect the heat spreader with the component, and a threaded aperture adapted to receive the threaded shaft;
- a plurality of vanes in contact with the heat mass and spaced apart to define a primary slot therebetween that extends to the heat mass, the vanes have a surface area that increases in a radially outward direction from the axis,
- the vanes including a top face, an aerodynamically profiled inner wall including a first portion extending from the groove and terminating at a second portion that extends to the top face, the inner walls of the vanes defining a chamber that surrounds the groove, an outer wall having a surface profile that widens from the base of the heat mass to the top face and includes therebetween a smooth curved portion, a draft portion, and a smooth radially outward portion, and
- the vanes including at least one secondary slot extending through a portion of each vane to define a plurality of fins in each vane, and
- wherein an air flow entering the chamber exits through the primary slots and a bottom portion of the secondary slots in an exhaust flow that dissipates heat from the vanes and the fins, the exhaust flow creates a low pressure region within the chamber that induces an intake flow into the chamber through the secondary slots and a top portion of the primary slots thereby dissipating heat from the fins and the vanes, and the low pressure region induces a surface flow along the first and second portions of the inner wall so that the surface flow passes over the groove and the boss to dissipate heat from the heat mass;
- a fan for generating the air flow into the chamber, the fan connected with the top face;
- a component including a component face;
- and
- a base mount for urging the mounting surface and the component face into contact with each other so that heat generated by the component is thermally communicated into the cooling device.
9 more elements
Dependencies are inferred from the claim text.