US2268360A

US2268360A - Heat exchange apparatus

Info

Publication number: US2268360A
Application number: US342892A
Authority: US
Inventors: Edmund R Walker
Original assignee: Fedders Manufacturing Co Inc
Current assignee: Fedders Manufacturing Co Inc
Priority date: 1940-06-28
Filing date: 1940-06-28
Publication date: 1941-12-30
Anticipated expiration: 1958-12-30

Description

Dec. 30, 1941. E. R. WALKER ,2

HEAT EXCHANGE APPARATUS Filed June 28, 1940 5 Sheets-Sheet l INVENTOR Edmund 7i? Ma l/(er ATTORRE Dec. 30, 1941. E. R. WALKER HEAT EXCHANGE APPARATUS Filed June 28, 1940 5 Sheets-Sheet 2 W ATTOR INVENTOR Edmund It? h d/ker Dec. 30, 1941. E. R. WALKER HEAT EXCHANGE APPARATUS Filed June 28, i940 3 Sheets-Sheet 3 INVENTOR t'amunafi Walker- ATTO Patented Dec. 30, 1941 UNITED STATES PATENT. OFFICE HEAT EXCHANGE APPARATUS Edmund E. Walker, Kenmore, N. 1., usiznor to Fcdders Manufacturing Company, Inc., Bufialo,

Application June 28, 1940, Serial No. 342,892 3 Claims. (Cl. 257-136) visedv to support the coil unit in such manner that the coil may freely expand or contract in its normal plane, and yet be fully protectedagainst all other physically or thermally activated strains. The residual stresses, which may be caused by differential expansion or contrac= tion within the heating surfaces of the coil unit, are automatically absorbed by the structure of the tube components thereof, which are devised to yield individually by bending to'accommodate themselves to the'position oi the remainder of their companion tubes without the application of direct thrust or tension loads on any portion of the structure.

Other features of the invention, including a novel steam distribution system, are more specif-= ically set forth in the accompanying specifics. tion and drawings, wherein:

Fig. 1 is a front View of the coil unit;

Fig. 2 is an enlarged section on the line 2-2 of Fig. l, with the lower portion shown in elevation;

Fig. 3 is an enlarged fragmentary section on the line 3-45 oi Fig. 2;

i is a perspective view showing the orifice structure oi the upper extremity of the tubes;

Fig. 5 is a diagrammatic view showing several oi the units applied to a portion 0! an air heating system. I

The invention consists of a rigid fabricated casing it which serves to support and contain a coil unit i I. The casing H is formed or sheet metal parts, including top and bottom sections it and. E5, and sides N, The sides II are formed with marginal flanges I! and II, the latter or horizontal flanges supporting the sections H and it which are secured thereto by rivets 2 l' (Fig. 3). it will be seen in Fig. 2 that the sections it and it are provided with flanges Ho and lie, and

with ofiset central portions h and lit, respectlvely, which latter portions serve to partially enclose the headers oi the coil unit it, as will be explained hereinafter.

Theflangeslla, lie, and it, it will he noted. all lie in a common plane, and thus they pro vide a continuous marginal pad P on each face of the casing, to which other casings may be secured, or to which a duct 2| and a blower casing 2| may be attached, as shown diagrammatically in Fig. 5. Holes 22 are provided in the pads P at spaced intervals to receive bolts or rivets for securing the casing 'to such other units.

It will also be observed that at the corners of the pads P the extremities of the flanges a, Na are slightly ofiset, as indicated by the numere-ls 24, to receive cars 25 on the flanges II. Rivets 26 secure the parts together at these points. I

On the sides of the casing, the exposed ends oi the top and bottom sections H and i5 are covered by angle members 28, which members are secured to the horizontal flanges l8 of the sides M3 by rivets 2d.

The coil unit it consists of upper and lower

cylindrical headers

35 and 36, and connecting finned tubes 3'8. The headers are closed at each extremity by heads 38, which are soldered in place. Each head 3i: is formed with a projecting mounting pintle so. The extremities of the tubes ill are entered in internally flanged holes M and G2 in the headers 35 and 86 respectively, and it will be seen in Fig. 4 that the extremities of the tubes, which lie within the header 36, are formed with rounded and reduced terminals 48 formed with angularly spaced ports 45 partially definedv by intermediate and opposing jaws 48.

The tubes 3? are bent near their central portlon, as indicated by the numeral M, so that individual tubes may respond to expansion or contraction by arching between the supports provided by the

headers

35 and 36.

The upper or steam header 35, at its center portion, carries hrackets 48 which are rigidly connected to the top section l4 oi the casing by rivets 4| (Figs. 3 and 3). The upper portion through clearance holes 53 in the sides l6, and

they enter bearings 54 of externally located brackets 55, which brackets are rigidly secured to the sides it by rivets 58 and El.

A distributor plate 58 is secured within the header 35 immediately beneath the steam inlet nipple t0, and it is formed with two curved opinlets of the tubes.

they are received in brackets 60. The brackets 60 are similar to the brackets 55, except that they are formed with vertical slots SI for receiving the ends of the pintles I 01 the lower header 3. The lower header 35 carries an integral outlet nipple 62, which projects through an opening 53 in the bottom section 15.

, Bent plates 64 and 85 are secured to the upper and lower sections I4 and i5, where they serve as shrouds to direct the air in a smooth flow through the finned tube portion of the coil unit.

In a heating installation, it will first be ob-' served that the central supports 48 of the upper the header pintles 50 in the bearings 54 permits only axial movement of the ends of the headers,

and warping or twisting effects are thus pre-- vented.

It will be apparent that since the upper header 35 is fixed axially, expansion of the tubes 31 will'cause free downward movement of the lower header 36 under the sole guidance of the pintles 4|! thereof in the vertical slots 6| of the brackets ill. Thus, the lower header 361s free at all times to accommodate itself to the dimensional changes of the tubes 37, as may be occasioned by thermal conditions within the coil unit.

In view of the fact that under unusual operating conditions differential expansion or contraction may occur between the various tubes 31, provision is made in the knee or bent portion I! of each tube, so that each tube is in efiect an eccentric column which may bend or warp between the headers. Thus, the lower header may, as previously noted, move in response to the expansive demands of a majority of the tubes, and at the same time the remainder of the tubes, even though expanding at a different rate or degree, will accommodate themselves automatically to the general movement without placing disruptive strains on their connection joints with the headers.

such ports and the-surrounding structure serve as scale breakers, wherein, when a scale is lodged over one or the ports, it finds little support on the non-planar edges thereof, and therefore the scale will be subjected to a violent fluttering action resulting in its disintegration or dislodgment.

In addition, the ports I! also serve as entrance nozzles for each of the tubes 31, having slightly restrictive characteristics, which is desirable to insure uniform steam distribution to all of thetubes.

It will be understood by those skilled in the art that the example of the invention as above described is intended to disclose certain inven- It will now be apparent that the structure of the casing is such that it serves as a rigid housing within which the coil unit is supported, so that it is free to expand in its normal or natural plane without restraint, but is rigidly protected against all twisting or warping action.

Referring to the operation of the unit, it will be seen in Fig. 5 that steam is supplied through the supply pipes S for distribution through the units ll. Air is drawn through the units by the blowerunit 2 l, and the heated air is directed to its destination, not shown herein. As is unavoidable in such systems, boiler scales are entrained with the steam, and often the scales are of suiiicient size to block or partially block the In the present structure, the orifice ports 45 are not only difficult to block, because of their partially spherical contour, but

tive principles, which are obviously applicable to numerous other types of heat exchange devices. It is therefore intended that the invention shall be deemed commensurate with the scope of the following claims.

I claim: 1. In a heating device, a casing, a heating unit within said casing, said unit including spaced upper and lower headers and tubes connecting said headers, means connecting the upper header to the casing and including a rigid connection between the central portion of the upper header and the casing, said upper header having a projecting pintle on each extremity, brackets secured to opposite sides of the casing and having bearings formed therein for slidably receiving said pintles, whereby the ends of the upper header are permitted free expanding movement under axial guidance of said, pintle and bearing connections, and cooperating means on the lower header and casing for permitting free guided movement of the lower header.

2. In a heating device, a casing, a heating unit within the casing, said unit including spaced upper and lower cylindrical headers and parallel tubes connecting the headers, said casing having offset recessed portions for partially receiving said headers, cylindrical pintles projecting from the ends of both headers, bearings on the casing for slidably and rotatably receiving the pintles of the upper header, said casing also having vertically slotted members for receiving the pintles of the lower header.

3. In a heat exchange device, a substantially rectilinear casing having top, bottom, and side walls connected together, a heating member mounted in said casing, said member comprising upper and lower headers and interconnecting expansible tubes, each of said headers being provided with end plates having a pintle projecting therefrom, opposed brackets secured to the casing adjacent the ends of the upper header but spaced therefrom, said brackets being formed with cylindrical bearings receiving the upper header pintles with longitudinal clearance, whereby the upper header mayexpand in an axial direction, and opposed slots formed in said casing adjacent the lower header, said slots receiving the lower header pintles for vertical and axial expansion of said header, said expansible tubes being bent whereby expansion of the heating member as a Whole may be accommodated by extension of said tubes and movement of said lower header with respect to said slots.

EDMUND R. WALKER.