US2228550A

US2228550A - Heat transfer device

Info

Publication number: US2228550A
Application number: US251878A
Authority: US
Inventors: Fred M Young
Original assignee: Individual
Current assignee: Individual
Priority date: 1939-01-20
Filing date: 1939-01-20
Publication date: 1941-01-14
Anticipated expiration: 1958-01-14

Description

Jan. 14, 1 941. FQM. YOUNG I 2,228,550

HEAT TRANSFER-DEVICE Filed Jan; 20, 1939 //v vz/v Toe F1650 A7 YOU/v6 nrv-oewgy Patented Jan. 14, 1941; j

UNITED STATES ATENT; FF EIJF v i a I f 2,228,556. V

'nss'rpr'aansran DEVIC h Fred M.Yung, Racine,Wis. f Application January 20, 1939, Serial No. 251,878 j ZCIaims. (clear-'13s) I The present invention relates to heat exchanger cores adapted to be placed'in air ducts. or within unitary'housing's' where the head room is limited and has for its object, placing the finned tubesfofthe core'at an oblique angle in the housing or air duct, the front and rear edges 1 of the fins being turned parallel to' the housing or to the direction of air flow; V

The principal object of the present invention is to reduce the vertical space required without reducing-the capacity of the core and without adding materially to. the air flow resistance.

Heat exchangers of the, class are required in places where the head room is very limited. For example, in submarines, battleships and the like. The present invention is, therefore, particularly adapted for such installations.

To these and other useful ends, my invention consists of parts, combinations of parts, or their equivalents as hereinafter set forth and claimed and shown in the accompanying drawing in which: V

Fig. 1 is a front elevation of one form of my invention, a fraction of the anchor plate being removed so as to disclose the headers.

Fig. 2 is a side elevation of the device shown in Figure -1 taken on line 2-2 of this figure.

As thus illustrated, numeral I0 designates what may be considered the housing of a unit heater 3 which may be provided with a blower fan and suitable outlet grilles as is the custom in heat exchanger units of the class. Member Hi may also be considered a short portion of an air duct or the last or outlet section of the duct in which case a suitable outlet grille may be provided.

The core proper comprises preferably circular in cross section closed end header tubes II and I2 which are provided with inletand outlet connections I 3 and H. Because of the position of the circulating tubes, headers H and i2 need not be as long as the inside width of the housing or duct and header II is shown as positioned to the right and header I2 is positioned to the left. Inlet and outlet connections l3 and H are positioned on opposite ends thus to equalize the flow of the heating medium through the core tubes as is the custom in cores of the class.

I provide two spaced plates l5 and I6 which are welded to headers II and I2 as at I1 thus to 'form a support for the core and means for securing the core to the bottom plate of the housing or air duct. Thus the headers are securely fastened together and a base support is provided for the core which is secured to the housing by suitable bolts as illustrated. Each of the headers is provided wane number of adapted-tubes l8and l9. 1 There is provided an equal'number of mm; and rear circulating tubes", each end of which is expanded as at 2|, These expanded ends are, 5 adapted to 'embrace me'mbers l8 and I0 andbe bonded thereto. r Tubes 20 are connected attheir upper ends by means of loops 22, the ends being embraced by the expanded ends of the tubes and bonded 10 thereto. At each end of the tubes If provide a tube plate 23 whichis adapted to embrace and be bonded to the expanded ends of the tubes thus to form an upper and lower 'air channel closure; The sides of these header plates "are 15 provided with outwardly extending flanges 24.

I provide shallow channel plates-25-'-25" the flanges being turned outwardly which aresecured to flanges 24 as illustrated thus' forming side closures for the air as it passes through the 20 core. A'multiplicity of closelysp'acedfins 26is provided through which the tubes extend and to which the tubes'are bonded by means 'ofisuit able flanges as is the customin devices of the class. f 25 Fins 26 extend a distance forwardly and rear- 'wardly of tubes 20, the free edges being bent so as to form portions 21 which are positioned parallel to the direction of air flow as illustrated. Members 25, it will be noted extend for- 30 wardly and rearwardly a short distance past the ends of extensions 21 thus to protect the fins against injury while assembling and handling the core.

The relation of member 21 to the fins is simi- 35 lar to the relation of the angle of tubes 20 to the direction of airflow. As thus organized, the flanges of 'members 25 fill the space between the core and the side members of the housing. There is, however, an opening left above and below 40 members 23' through which air may pass.

I providev a lower plate 28 the lower end being bent so as to contact the bottom plate of the housing and being secured thereto by suitable bolts as illustrated. Plate 28 is made so it 45 occupies the entire inside width of the housing, the upper end contacting plate 23 and being secured threto as illustrated. Thus the open space under the core will be closed and a suitable anchor provided to the bottom plate of the 5 housing. g I

I provide an upper plate 29 which is bent at its outer end as illustrated so as to fit against the upper plate of the housing and being secured thereto by means of bolts as illustrated. The 55 v lower end of member 29 is in turn secured to member 23 as illustrated. Member 29 is made to fill the space between the side members of the housing. Thus it will be seen that the air space over the top of the core will be sealed and a suitable anchor provided for the top end of the core.

Thus it will be seen that all of the air that passes through the housing must pass between the fins, that it enters the space between the fins while traveling on a line parallel to the housing and that the air is discharged at the opposite side of the core on a line parallel to the housing.

Thus it will be seen that I have provided a core having considerable greater length than would be possible if positioned at right angles to the housing and that the air will not be diverted before entering the space between the fins.

It has been found that by providing fin edges as illustrated, that resistance to the passage of the air is greatly reduced. In fact, resistance is not very much greater than if the core was placed at right angles to the housin and the fins made straight and positioned parallel to the direction of air fiow.

Some of the advantages of the present invention are that the core is light, strong, easily manufactured and installed and may be firmly secured to the duct or housing. Y

Clearly my improved core may be installed in the housing at the factory or shipped to the place of installation and suitably mounted in the air duct. When the core is shipped without a housing,

members

28 and 29 need not be secured to the tube plates until after the core has been installed in the air duct. v

Clearly many minor detail changes may be made without departing from the spirit and scope of the present invention as recited in the ap- 40 pended claims.

ers arranged in parallel relation and secured together by means 01' plates adapted to rest on the adjacent panel of said air duct, said headers having inlet and outlet tube connections which extend through the adjacent panel oi said air duct, tube loops forming an operating connection between said headers and being positioned at an acute angle within said air duct, a multiplicity of closely spaced fins through which said tubes extend and at right angles thereto forming a core, the edges of said fins extending a distance past the front and rear edges of the tubes ofand loops and being bent parallel to the normal direction of air fiow, tube plates secured to the tubes of said loops and near the end fins thereof, the edges nearest the adjacent walls of said air duct having extensions which contact and are secured to said walls to thereby form anchors for the core and air locks between the end fins and said adjacent walls.

2. A heat exchanger of the class described, comprising an air duct, two closely spaced headers arranged in parallel relation and secured together by means of plates adaptedto rest on the adjacent panel of'said air duct, said headers having inlet and outlet tube connections which extend through the adjacent panel of said air duct, tube loops forming an operating connection between said headers and being positioned at an acute" angle within said air duct, a multiplicity of closely spaced fins through which said tubes extend and at right angles thereto forming a core, the edges of said fins extendinga distance past the front and rear edges of the tubes of said loops and being bent parallel to the normal direction of air fiow, tube plates secured to the tubes of said loops and near the end fins thereof, the edges nearest the adjacent walls of said air duct having extensions which contact and are secured to said walls to thereby form anchors for the core and air locks between the end fins and said adjacent walls, air closures positioned between the ends of said fins and the ends of said tube plates and the adjacent walls of said air duct.

FRED M. YOUNG.