US 2413179 A
Description (OCR text may contain errors)
Dec. 24,1946. I
P. E. GRANDMONT ETAL v RADIATOR Filed Sept. 20, 1943 n 4. I v/HM 9 1.14"
INVENTOR5 P E aemvazvwvr' EE/VEB ATTORNEY Patented Dec. 24, 1946 RADIATOR Paul E. Grandmont, East Orange, and Leo C.
Werner, Bloomfield, N. J., assignors to Westinghouse Electric Corporation,
East Pittsburgh, Pa., a corporation of Pennsylvania Application September 20, 1943, Serial No. 503,018
This invention relates to radiators, and spe-' cifically is directed to radiators such as used for anode cooling of radio, X-ray and similar devices.
The trend of the art toward increase of power desired and obtained from electronic devices has introduced the necessity for adequate cooling of the anode. Radiators have therefore been used, but the cost of production and inconvenience and time consumed in applying the same have been adverse factors in manufacture. Certain prerequisites must be observed in manufacture and installation of radiators of which mention is made of the necessity for close contact with the part from which heat is to be transferred or radiated; and another is the need for extensive radiator areas and adequate air-space around the same. Manufacturing difiiculties have interfered with production of a radiator having all fins thereof integral to be applied as a unit and yet offer maximum radiating area. The present invention accordingly has for its general object to overcome the short comings and difficulties in manufacture encountered in the prior art.
More specifically an object of the invention is to provide a radiator wherein all the fins are formed from a strip of material and remain integral with each other and arranged radially from a common axis.
Another object of the invention is to provide a radiator as above characterized wherein a large fin area for each fin and adequate cooling space therebetween is accomplished.
A further object of the invention is to provide a method of rapid, uniform and practical forma- Figures 4 to '7 are sectional views of the ,dies utilized in performing the method of manufacture and showing successive positions of said dies and successive steps of the method;
Figure 8 is a perspective view of-a modified construction using tabs to space outer edges of pairs of fins apart;
Figure 9 is a cross-section similar to Fig. 2 and showing an outer band applied around the radiator fins; and
Figure 10 is a partial end view of a further modified construction of radiator.
In the specific embodiment of the invention illustrated in said drawing, an electronic device, in this particular instance a power tube, has been selected for utilization of ourimproved radiator. It should be understood, however, at the outset that our invention is applicable to other electronic devices, such as an X-ray anode, requiring heat dissipation. .The particular tube shown provides an evacuated envelope l0 containing appropriate electrodes for a useful purpose of which one electrode becomes necessarily heated and from which it is desired to dissipate the heat.
- It is usual to form the heated part or an extension thereof to protrude'at the exterior of the device, and, as indicated in Figure 2, the particular device shown is provided with a solid cylindrical protrusion II for the purpose which will,
as a matter of convenience and terminology be referred to as a core. It is heat of conduction in this core which is to be dissipated.
tion of integral fins of large area from a single 1 piece of material.
Yet another object of the invention is to provide a means for carrying out the method as a practical manufacturing operation.
Still further objects of the invention will appear as the description progresses, both by direct recitation thereof and by implication from the context.
Referring to the accompanying drawing in which like numerals of reference indicate similar parts throughout the several views;
Figure l is a side elevation of a radiator in accordance with the present invention mounted in place on an electronic device;
Figure 2 is a cross-section on line 11-11 of Fig. l;
Figure 3 is a perspective view of a portion of a formed series of fins from a single strip of Around the cylindrical core II is applied our improved radiator designated generally by. nu-
- meral l2 and preferably constituted by a plurality of integrally formed radially projecting metallic heat conductive fins l3. These fins are arranged vertically in the present showing radiat ing substantially on continuations of radiifrom the core. and all of equal length and of equal radial dimension or width. Said fins furthermore are arranged in annular sequence so as to be symmetrically disposed around the core with their inner vertical edges parallel and spaced from each other approximately equal distances and their outer edges likewise parallel and approximately equally spaced from each other but somewhat further apart thereat than the separation at said inner edges.
In groups of two the fins are connected or integrally joined at said inner edges by integrally formed webs I4 such that successive finsof a group are connected whereas successive fins of successive groups are not ,connected by a web. Likewise at the outer edges of the fins the same are connected in groups of two by intervening webs l5, these webs connecting the successive fins which are not connectedby webs therebetween at the inneredges. By
sequential series of groups as a unit is curled around the core and the two ends of the, series secured to each other thereby forming a circular radiator of unitary character but with radiating fins totalling a large surface area with both sides of each fin exposed from the surfaces of the next preceding. or following fins of the series.
If so desired, the webs at the outer edges of the fins may be provided each with a, slot 16 or other opening therein of desired size for admitting a cooling medium such asair into the channel between said fins. However, if desired to use the channels in the natureof fiuesfor passage of the cooling medium wholly longitudinally thereof, the slots may be omitted and a cylindrical band I! may be applied around'the outer edges and webs thereby closing the alternate channels not having outer webs, as shown in Figure 9. Said cylindrical band has an axial or vertical length equal to the length of the several fins and webs with which said band engages.
Furthermore, if so desired, and as shown in Figure 8, the pairs of fins I3 having the slotted connecting webs l5, may be braced and evenly spaced by tabs I'I'. These tabs may conveniently be part of the metal punched out in forming said slots IS, the same being bent away from the slot and toward the next or sequential fin of the adjoining pair of fins and welded or otherwise secured thereto.
Method of fabrication and application of our improved radiator constitutes a feature of the present invention. For carrying out this feature,
a plurality of movable forming and cutting die members are provided as partsof upper and lower dies designated generally by numerals [8,. l9 respectively. The lower die provides a projection 20 having the size and shape desired for each pair of fins and their connecting inner web. Above this projection 20 of the lower die is provided an upper die movable member 2| having a cavity 22 corresponding to said projection. A strip of material 23 having a width equal to desired height of the radiator is applied across the projection of the lower die and the movable member 2| of the upper die is then depressed, thereby folding a portion of the strip into the die cavity 22 as shown in Fig. 4.
The first two fins of the first group-of two are thus completely formed, but for the present, the
die members are retained in their forming position while the adjacent longitudinal part of the strip is given partial bends preparatory to final formation. Next to the part of the lower die having projection 20 is an upwardly movable lower die member 24 having an upward prolower die member in being actuated upwardly thereupon performs partial bends for the next fin and its webs, as shown accomplished in Fig. 5. Next beyond the aforesaid upper movable die member 2| is an auxiliary movable 26 having a recession sloping to correspond to theunderlying sloping face or the projection 2.5,and terminates with web-forming shoulders. This die member auxiliary movable die member is brought down onto the strip, thereby forming the second finof the group of two, completing the connecting web between 'the fins' of the group and making an initial bend for the web to-connect with the next group. This bending and forming is shown accomplished in Fig. 6.
For purposes of making slots- IS in webs M, a movable punch 21 is slidable downwardly in the upper die member 2 I. This punch is conveniently located to constitute its lower face a part of the lower face of the said movable die member during the bending operations above described which form the web beneath the punch. Said punch is furthermore preferably depressed simultaneously with the depression of auxiliary movable ,die member 26. Cooperating punch socket 28 is provided in lower movable die member 24, and thus.
the web having'been formed, the same still being clamped between the dies, punch 21 operates to punch slot l6 therein, and this is likewise illustrated accomplished in Fig. 6. Where tabs H are to be formed, the punch will be approximately constructed to leave the metal forming the same been completed, the upper die, die members and punch are lifted and thelower movable die member retracted, thereby releasing the strip which is moved to apply the partially formed group of fins on the projection 2|] of the lower die, as shown in Fig. 7. The above-described cycle of operations is then repeated, the said projection 20 and its cooperating upper die cavity 22 completing the bends of the second group of two fins which were initiated in thefirst cycle of operations. The strip is thus formed into the series of integral successively spaced and sloping fins with webs at ends of each fin obtaining desired spacing therebetween. The-formed strip is finally curled around the part to be cooled, as core II, and its ends welded or otherwise secured obtain- 7 ing continuity of the radiator around the core and tight contact of the inner webs against the core for efiecting heat conduction from the core to the radiator. Where tabs 1'! are employed the ends thereof are finally welded or otherwise secured to the sequential fin to be braced and spaced thereby.
Formation of the radiator without the slots IE may be accomplished by not operatin the punch to depress below the lower surface of the upper die. If desired, of course. the upper die may be constructed without a punch included therein.
While the preferred construction of radiator utilizes webs of finite width to obtain positive air space throughout the areas of the fins, dimension of the webs may be reduced to virtual blunt edges l4 l5 as shown in Fig. 10.
A radiator comprising sheet material formed with a plurality of fins in annular series, webs connecting said fins at their outer edges in groups of two, and tabs between successive fins of successive pairs of fins for spacing and bracing said pairs of fins from each other.
PAUL E. GRANDMONT. LEO C. WERNER.