US1916549A - Heat transferring unit - Google Patents

Description

July 4, 1933. F. M. YOUNG HEAT TRANSFERRING UNIT Fi led Nov. 14, 19:52

35 37 Fla-3 INVENTOR.

dfl fil ATTORNEY July 4, 1933.

F. M. YOUNG HEAT TRANSFERRING UNIT 2 Sheets-Sheet 2 Filed Nov. 14, 1952 Fi e-8 INKENTOR.

8/ ATTORNEY.

Patented July 4, 1933 PATENT OFFICE FRED M. YOUNG, OF RACINE, WISCONSIN HEAT TRANSFERRING UNIT Application filed November 14, 1932. Serial No. 642,533.

My invention relates particularly to the class of devices commonly used for car heating. It is, however, applicable to other uses wherein circulating air is heated or cooled for various purposes; or the device may be used for the purpose of cooling certain fluids or liquids through the medium of air currents or otherwise.

The object of the invention generally is to provide a device of this class that shall be simple in construction, pleasing in appearance and efiicient in operation.

One of the particular objects of the invention is to provide a car heater wherein the heated air current is directed downward and toward the center of the car through the medium of .the core tubes and fins, thereby to simplify the device, reduce cost and increaseits efficiency.

Another object of the invention is to provide headers of a shape and construction which will be neat and pleasing in appearance, easily constructed and eflicient in operation.

A further object is to provide a simple and efficient joining of the tubes to the header base and of the header proper to its base, thereby to simplify the assembling and bonding operations and further to strengthen the structure.

Another object of the invention is to provide a novel flange or reinforcin plate for the header, thereby to simplify t e bondin operation and provide a substantial and sa. e fastening for connections such as are necessary in a device of this class.

A further object of the invention is to provide raised sections in the fins between the tubes, thereby to increase the radiating surface of the fin and cause the circulating air to impinge adjacent fin surfaces alternately and more closely wipe the tube surfaces.

And further it is an object to provide a multiple of transverse rows of air foil or rectangular tubes, the tubes of each row positioned at an angle to the general direction of air flow, preferably three transverse rows of tubes. The tubes of the middle row are preferably to be positioned to register with the space between tubes of the adjacent rows and at opposite angle, to cause the air stream to be diverted in zigzag fashion, thereby to violently impinge the sides of the tubes.

With the above indicated objects, my invention consists of certain features novel in construction, combination and arrangement of parts by which said objects are accomplished, as hereinafter set forth and claimed and shown in the accompanying drawings in which:

Fig. 1 is a fractional side view of a car (in dotted lines) showing my invention as commonly positioned therein. Fig. 2 is a fractional top view of a car (in dotted lines) showing my invention in a conventional position therein.

Fig. 3 is a side elevation of my improved unit.

Fig. 4 is a front elevation of my improved unit.

Fig. 5 is a top plan view of my improved header wherein a fraction is shown in section.

Fig. 6 is a fractional sectional View taken on line 6 of Fig. 4.

Fig. 7 is a fractional section taken on line 7 of F ig. 6.

Fig. 8 is a fractional section similar-to Fig. 6 except the center row of tubes are shown as differently shaped and positioned.

Fig. 9 is a fractional section taken on line 9 of Fig. 4.

Fig. 10 is a fractional section similar to Fig. 9, differing only in the header plate flange.

Fig. 11 is a pictorial sketch of my improved header bracket. A

Fig. 12 is a fractional section of my improved header bracket taken on line 12 of Fig. 4.

By referring to the various drawings my novel structure as illustrated will be understood as comprising a radiating unit which in its entirety is designated by the reference character A.

By referring to Figs. 1 and 2, it will be seen that the unit A is attached to the car foot board 15 near the right hand side thereof. Preferably an electric fan designated by the numeral 16 is adapted to force air rearwardly through the unit, the air current flowing thereafter substantially as indicated by arrows in a manner which will hereinafter appear. I

The unit is connected to the engine cooling system by means of tubes or hose connections 17 whereby part of the. circulating cooling fluid will pass through the unit A, thereby heating the air current as it passes through the unit.

The unit A consists of vertical tubes 18 which are in parallel relation and arranged preferably in three rows transverse to the unit, as indicated, and connected at their ends to headers which in their entirety are designated by the reference character B in the following manner Referring to Fig. 9, the header bottom 20 is provided with flanged openings 21 into which the tubes 18 fit snugly, the ends of which preferably protrude slightly as at 22.

The header plate 20 around its outer edge is flanged or skirted asat 23 preferably opposite to flanges 21. Thus it will be seen that the tube ends can easily be guided into their respective openings, and that they can be securely bpnded to the flanges 21 by dipping their ends into the molten bonding material without the bonding material contacting with flange 23.

Referring now to the header B, the skirt 25 is drawn so as to form a recess or ledge 26 against which the plate 20 may rest. The depth of flange 23 being greater than the recess formed by the skirt 25 whereby when header bottom 20 rests against the ledge 26, the flange 23 will protrude slightly, thereby providing an ofi'set or ledge by means of which the bonding material can be directed into the joint and also form into a fillet to more securely bond the joint.

Referring now to Figs. 3, 4, 5 and 9:

It will be noted that the front 27 of the header B is a flat vertical surface. The rear surface 28 beginning near the ledge 26 is curved toward the front. The sides or edges 29 also are curved in the same manner as the rear surface, the sides and rear forming an angle that converges toward the center and front. The large threaded opening 30 is. located in the center of the front, therefore permitting the liquid to flow from the opening directly to all of the tubes 18 in easy curves. And at the other end of the unit the liquid will flow in easy single curves from the tubes to the opening 30. a

It-will be observed that the headers at both ends of the unit are exactly alike, therefore, the flow of the liquid through the entire unit from one opening to the other will be in easy flowing curves, thus tending to increase the flow of liquid from the cooling system through the unit, thereby increasing the efficiency of the unit.

Before the header B is bonded to the plate emme depression 35 is formed in 27 to register with openings 34 thus to provide a pocket into which the bolts used may project. The bracket 31 is preferably L-shaped, thereby to fit over top of the header and provide room for air or liquid drain plugs 36.

Three openings are provided in the extended portions of the bracket 31 whereby this bracket may be riveted to the header as at 37.

I provide a raised projection 38 in the top of the header, which closely surrounds the horizontal part of bracket 31 and an opening 39 is provided at or near the corner of the bracket for a purpose which will hereinafter appear.

When it is desired to attach the bracket 31 to the header, bonding material stops 40 are inserted in the depression 35 and a stop 41 for a similar purpose is placed on the outside end of flange 32. The bracket 31 is then placed into position and riveted to the header as at 37. The bonding is then completed by applying heat and bonding material in a molten state in the opening 39. the object of which is now apparent.

The molten bonding material will flow between the bracket 31 and the header. The projection 38 in addition to presenting a pleasing appearance strengthens the part of the header which is usua-lly exposed to view, and further forms a sharp offset or trench around the bracket 31, thus any bonding material that may pass from under the bracket 31 will accumulate in the trench, thereby strengthening the joint and avoiding marking the header by flowing bonding material.

The dissimilar material stops 40 act to prevent the molten bonding material flow ing into the openings 34 and the dissimilar material 41 acts as a stop to prevent the molten bonding material from flowing to the interior of the header.

As thus illustrated and described, it will be seen that I have provided a novel, strong, simple and efficient header and header bracket.

After the bracket 31 has been bonded to the header and the, tubes 18 bonded to the header bottom 20, as heretofore described, the header skirt 25 is pressed over the flange 23 and when in an inverted position heat and bonding material is applied to joint the bonding material forming a fillet between the edges of the flange 23 and skirt 25, the ledge 26 serving to hold the joint together and produce after bonding a strong structure of pleasing appearance.

In Fig. 10 I tom which is designated by the numeral 45, differing from plate 20 only in that the outer flange 46 is turned in the same direction as flanges 21. This outer flange is made to seat on ledge 26, the opposite side of which projects past the end of skirt 25 for the same purpose as herebefore described.

One of the novel features of my invention is the construction, combination and opera tion of the core tubes and fins. The core tubes 18 as shown in Fig. 6 are what is commonly termed air foil in shape. They are positioned preferably in three rows transverse to the unit and at an angle to the normal direction of air flow (which is indicated by arrows), and thus causes the air to impinge the surface of the tubes and cause it to be discharged to-.

ward the center of the car as indicated in Fig. 2. The tubes in the center row are preferably positioned to register with the space between adjacent tubes thus to cause air turbulence and a closer wiping of the tubes by the air.

The fins 47 (see Figs. 6 and 7) are supplied with tube flanges 48 to provide a close fitting, suitably sized surface with which to securely bond the fins to the tube. The fins are closely spaced on the tubes and positioned at an angle to the horizontal, as indicated in Fig. 3, the rear side being low to thereby cause the air to impinge the fins and be directed downward into the car, as shown by arrows in Fig. 1. Thus without the use of directing blades the heated air is directed whereby it will be most eflicient in heating the car.

To still further increase the efliciency of the system, raises 50 are pressed into the fins, the location preferably being between the tubes, as indicated in Fig. 6, and so the raises register with each other as shown in Fig. 7,

thus causing the air to impinge the fins alternately and more closely wipe the sides of the tubes.

Fig. 8 illustrates a modified form of tube and position. It will be seen that the tubes are arranged in three banks, as shown in Fig. 6, the center bank differing in that the tubes are oppositely angled. 55 designates the fins which are assembled on tubes 56 and positioned similar to the ones shown in Figs. 2 and 3. The tubes 56 and 57 in this modification are preferably rectangular in cross section; the front and rear rows of tubes designated by the numeral 56 are positioned similar to the front and rear rows as illustrated in Fig. 6. The middlerow of tubes 57 are, however, positioned on a reverse angle show a modified header bot-- whereby the air stream will be diverted in zigzag fashion but discharged in the direction of the center of the car, thus the air will be caused to violently impinge the sides of the tubes and thus increase the efliciency of the unit.

Raises 58 are pressed into the fin 55 and positioned between the sides of the tubes 56 and 57 and register with raises in adjacent fins as and for the same purpose shown and herebefore described in connection with Figs. 6 and 7 It will be understood that my improved heat transfer unit may be enclosed in any form of conventional housing. For the purpose of convenient illustration the units shown in Figures 3 and 4 are shown without housings, which usually consist of a thin casing of decorative sheet steel.

It will be seen by the foregoing that I have provided a heat transferring unit which is novel, simple and efficient. It is evident that various modifications, such as in the position and shape of the tubes, the shape of the projections pressed into fins and various other minor changes may be made without departing from the spirit of the invention.

What I claim as'new and desire to secure by Letters Patent is:

1. A heat transfer unit, comprising suitable headers, flattened circulating tubes forming a connection between said headers, a plurality of closely spaced fins through which said tubes extend, air circulating means, said tubes and fins positioned atan angle to the normal direction of air flow whereby the air is discharged from said unit in a downward and sidewise direction.

2. A heat transfer unit, comprisin a plurality of suitably shaped tubes, a p urality of fins closely spaced and intimately bonded to said tubes, suitable headers and means for circulating heated liquid through said tubes and headers, means for moving an air current between said tubes and fins, said tubes and fins positioned at angles to the normal direction traveled by the air current, thereby to cause the air to impinge said fins and tubes and discharge the heated air downward and sidewise, as and for the purpose specified.

3. A heat transfer unit, comprising a plurality of suitably shaped tubes in parallel relation, a plurality of fins closely spaced and intimately bonded to said tubes, suitable headers adapted to direct heated liquid to and from said tubes, means for moving an air current between said fins and tubes, said tubes at the rear of said unit positioned at an angle and said fins positioned on said tubes at an angle, thereby to discharge said air current downward and sidewise.

4. A heat transfer unit, comprising suitable headers and a pluralit of suitably shaped tubes therebetween an positioned in parallel relation, a plurality of radiating fins closely spaced and intimately bonded to said tubes, air circulating means, said tubes arranged in three separate rows transverse to said unit, the tubes of the center row positioned to register with the space between tubes of the adjacent rows and arranged at alternate angles, thereby to cause the air to impinge the sides of said tubes alternately.

5. A heat transfer unit, comprising two headers and a plurality of tubes in parallel relation therebetween, said headers each having flat fronts and circulating liquid connections in the center thereof, the rear and sides of said header having curves which converge over the tube ends toward the center and front, whereby the circulating liquid will pass through said header to and from said tubes in easy flow curve lines. 7

6. A heat transfer unit, comprising a plurality of tubes in parallel relation, a header bottom intimately bonded to said tubes by means of projecting flanges, an outwardly projecting flange on the perimeter of said header bottom, a header the front of which is flat, the rear and sides having curves which converge toward-the center and front thereof, a skirt around the perimeter of said header formed by an outwardly projecting flange, said skirt adapted to fit snugly within said header bottom flange, said skirt and header bottom flange intimately bonded together thereby forming a simple, substantial bonding between the tubes, header bottom and header.

7. A heat transfer unit, comprising a plurality of tubes in parallel relation, a header bottom intimately bonded to said tubes through outwardly projecting flanges, a

flange on the perimeter of said header bottom, a header, the front of which is flat, the rear and sides having curves which converge toward the center and front thereof, a skirt around the perimeter of said header formed by an outwardly projecting ofi'set, said skirt adapted to fit snugly over said flange but short of the flange length when said flange is seated against said ledge, said skirt and flange intimately bonded together, thereby forming a simple substantial joining between the tubes, header bottom and header.

8. A heat transfer unit, comprising a suitable bank of tubes and headers at the ends thereof, a reinforcing plate adapted to fit over the front of said header, threaded openings in said plate, depressions in said header registering with said openings, thereby forming a pocket into which the end of a bolt may project, means for intimately bonding said plate to said header.

9. A heat transfer unit, comprising a suitable bank of tubes, headers at the ends thereof, an L-shaped reinforcing plate adapted to fit over the front and top of said header, an opening at the bend of said plate, a raised projection in said header adaptedto closely surround said plate forming a depression therefor, said plate bonded to said header by applying molten bonding material to said opening whereby said molten bonding material will intimately bond said plate to said header, the surplus of which will accumulate between said raised projection and said plate.

In witness whereof, I hereunto aflix my hand this fourth day of November, 1932, at Racine, Wisconsin.

FRED M. YOUNG.

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