Heat sink

Claim 2

A heat sink for semiconductor rectifiers and the like comprising an elongated extrusion having a pair of integral fin sections that extend longitudinally of said heAt sink and are joined together by an integral transverse horizontal web, said heat sink being symmetrical about a vertical plane perpendicular to said web and intersecting said web midway between said fin sections, and wherein each fin section comprises a trunk portion and a plurality of heat radiating fins which extend longitudinally of said heat sink, said trunk portions each comprising a base integral with said web, one trunk portion projects laterally outwardly from said web in one direction for one fin section and the other trunk portion projects laterally outwardly from said web in the opposite direction for said other fin section, a first plurality of said fins of at least more than four on each fin section project upwardly from a respective trunk and are inclined laterally outwardly from said web at an acute included angle to a horizontal axis of said trunk, a second plurality of said fins of at least more than four on each of said fin sections project downwardly from a respective trunk and are inclined laterally outwardly from said web at acute included angles to a horizontal axis of said trunk, and wherein each of said trunk portions is tapered in thickness from its base to its tip such that the thickness of said trunk decreases progressively in a direction laterally outwardly from said web as a function of the number of remaining fins.

Claim 3

The heat sink set forth in claim 1 wherein said heat sink further comprises first and second vertical legs disposed respectively at opposite sides of said web and integral with said trunk portion base of a respective fin section, said legs projecting downwardly below said second plurality of fins and having a lateral right angle flange thereon disposed below said second plurality of fins, said legs also extending longitudinally of said heat sink between opposite ends of said heat sink.

Claim 4

The heat sink set forth in claim 2 wherein each of said legs has a planar inner surface extending vertically from said web to said flange and longitudinally between opposite ends of said heat sink and wherein said flanges include a plurality of apertures for receiving fasteners to attach said flanges to a bus bar support.

Claim 5

The heat sink set forth in claim 1 wherein each of said fins has a free end remote from the trunk of its respective fin section with said fin ends defining a generally rectangular overall configuration to said fin sections in a transverse vertical plane.

Claim 6

The heat sink set forth in claim 1 wherein said fins provide a two-dimensional surface length of on the order of 150 to 170 inches in a transverse vertical plane.

Claim 7

The heat sink set forth in claim 1 wherein said acute included angles in said first and second plurality of fins are progressively smaller in a direction laterally outwardly from said trunk portion base toward laterally outer tips of said trunk portion.

Claim 8

The heat sink set forth in claim 6 wherein said acute included angles in said first plurality and said second plurality of fins vary progressively from about 75* to about 35* in a direction away from said web.

Claim 9

The heat sink set forth in claim 1 wherein the thickness of said trunk portion base is at least about 10 times greater than the thickness of said trunk at its laterally outer tip.

Claim 10

In combination a low voltage bus bar and a rectifier heat sink mounted directly on said bus bar wherein said bus bar has a flat planar surface for receiving said heat sink and wherein said heat sink further comprises a pair of integral fin sections that extend longitudinally of said heat sink and are joined together by an integral transverse horizontal web, said heat sink being symmetrical about a vertical plane perpendicular to said web and intersecting said web midway between said fin sections, each fin section comprises a trunk portion and a plurality of heat radiating fins which extend longitudinally of said heat sink, said trunk portions each comprising a base integral with said web, one trunk portioN projects laterally outwardly from said web in one direction from one fin section and the other trunk portion projects laterally outwardly from said web in the opposite direction for said other fin section, and wherein said heat sink further comprises first and second vertical legs disposed respectively at opposite sides of said web integral with said trunk portion base of a respective fin section, each leg projects downwardly from said web below said fins, a right-angled flange on the lower end of each of said legs, said legs and said flanges extend longitudinally of said heat sink the full length thereof and wherein said flanges are fastened on said bus bar against said flat planar surface.

Claim 11

In combination a low voltage bus bar and a rectifier heat sink mounted directly on said bus bar wherein said bus bar has a flat planar surface for receiving said heat sink and wherein said heat sink further comprises a pair of integral fin sections that extend longitudinally of said heat sink and are joined together by an integral transverse horizontal web, said heat sink being symmetrical about a vertical plane perpendicular to said web and intersecting said web midway between said fin sections, each fin section comprises a trunk portion and a plurality of heat radiating fins which extend longitudinally of said heat sink, said trunk portions each comprising a base integral with said web, one trunk portioN projects laterally outwardly from said web in one direction from one fin section and the other trunk portion projects laterally outwardly from said web in the opposite direction for said other fin section, and wherein said heat sink further comprises first and second vertical legs disposed respectively at opposite sides of said web integral with said trunk portion base of a respective fin section, each leg projects downwardly from said web below said fins, a right-angled flange on the lower end of each of said legs, said legs and said flanges extend longitudinally of said heat sink the full length thereof and wherein said flanges are fastened on said bus bar against said flat planar surface.

Claim 12

The combination set forth in claim 9 wherein said web is provided with a plurality of rectifier receiving apertures adapted to receive a plurality of semiconductor devices so that said bus bar serves as a common electrical connection for each of said rectifiers and said legs serve as the sole mechanical support for said heat sink, provide a heat transfer path from said rectifiers to said bus bar and provide an electrical connection from said rectifiers to said bus bar.

Claim 13

A heat sink for semiconductor rectifiers and the like comprising an elongated aluminum extrusion having a pair of integral fin sections that extend longitudinally of said heat sink and are joined together by an integral transverse horizontal web, said heat sink being symmetrical about a vertical plane perpendicular to said web and intersecting said web midway between said fin sections, and wherein each fin section comprises a trunk portion and a plurality of heat radiating fins which extend longitudinally of said heat sink, said trunk portions each comprising a base integral with said web, one trunk projects laterally outwardly from said web in one direction for one fin section and the other trunk portion projects laterally outwardly from said web in the opposite direction for said other fin section, a first plurality of said fins of at least more than four on each of said fin sections project upwardly from a respective trunk and are inclined laterally outwardly from said web at an acute included angle to a horizontal axis of said trunk, a second plurality of said fins of at least more than four on each of said fin sections project downwardly from a respective trunk and are inclined laterally outwardly from said web at acute included angles to a horizontal axis of said trunk, said acute included angles in said first and second plurality of fins are progressively smaller in a direction laterally outwardly from said trunk portion base toward laterally outer tips of said trunk portion, each of said trunk portions is tapered in thickness from its base to its tip such that the thickness of said trunk decreases progressively in a direction laterally outwardly from said web as a function of the number of remaining fins and wherein each of said fins has a free end remote from the trunk of its respective fin section with said fin tips defining a generally rectangular overall configuration to said fin sections in a transverse vertical plane.

Claim 14

A heat sink for semiconductor rectifiers and the like comprising an elongated aluminum extrusion having a pair of integral fin sections that extend longitudinally of said heat sink and are joined together by an integral transverse horizontal web, said heat sink being symmetrical about a vertical plane perpendicular to said web and intersecting said web midway between said fin sections, and wherein each fin section comprises a trunk portion and a plurality of heat radiating fins which extend longitudinally of said heat sink, said trunk portions each comprising a base integral with said web, one trunk projects laterally outwardly from said web in one direction for one fin section and the other trunk portion projects laterally outwardly from said web in the opposite direction for said other fin section, a first plurality of said fins of at least more than four on each of said fin sections project upwardly from a respective trunk and are inclined laterally outwardly from said web at an acute included angle to a horizontal axis of said trunk, a second plurality of said fins of at least more than four on each of said fin sections project downwardly from a respective trunk and are inclined laterally outwardly from said web at acute included angles to a horizontal axis of said trunk, said acute included angles in said first and second plurality of fins are progressively smaller in a direction laterally outwardly from said trunk portion base toward laterally outer tips of said trunk portion, each of said trunk portions is tapered in thickness from its base to its tip such that the thickness of said trunk decreases progressively in a direction laterally outwardly from said web as a function of the number of remaining fins and wherein each of said fins has a free end remote from the trunk of its respective fin section with said fin tips defining a generally rectangular overall configuration to said fin sections in a transverse vertical plane.

Claim 15

A heat sink for semiconductor rectifiers and the like comprising a pair of integral fin sections that extend longitudinally of said heat sink and are joined together by an integral transverse horizontal web, and wherein each fin section comprises a trunk portion and a plurality of heat radiating fins which extend longitudinally of said heat sink, said trunk portions each comprising a base integral with said web, one trunk portion projects laterally outwardly from said web in one direction for one fin section and the other trunk portion projects laterally outwardly from said web in the opposite direction for said other fin section, a first plurality of said fins on each fin section project upwardly from a respective trunk and are inclined laterally outwardly from said web at an acute included angle to a horizontal axis of said trunk, a second plurality of said fins on each Of said fin sections project downwardly from a respective trunk and are inclined laterally outwardly from said web at acute included angles to a horizontal axis of said trunk, and wherein each of said trunk portions is tapered in thickness from its base to its tip such that the thickness of said trunk decreases in a direction laterally outwardly from said web as a function of the number of remaining fins.

Claim 16

A heat sink for semiconductor rectifiers and the like comprising a pair of integral fin sections that extend longitudinally of said heat sink and are joined together by an integral transverse horizontal web, and wherein each fin section comprises a trunk portion and a plurality of heat radiating fins which extend longitudinally of said heat sink, said trunk portions each comprising a base integral with said web, one trunk portion projects laterally outwardly from said web in one direction for one fin section and the other trunk portion projects laterally outwardly from said web in the opposite direction for said other fin section, a first plurality of said fins on each fin section project upwardly from a respective trunk and are inclined laterally outwardly from said web at an acute included angle to a horizontal axis of said trunk, a second plurality of said fins on each Of said fin sections project downwardly from a respective trunk and are inclined laterally outwardly from said web at acute included angles to a horizontal axis of said trunk, and wherein each of said trunk portions is tapered in thickness from its base to its tip such that the thickness of said trunk decreases in a direction laterally outwardly from said web as a function of the number of remaining fins.