US2332450A - Heat exchanger - Google Patents

Description

Oct. 19, 1943. G, 5, MANTLE 2,332,450

HEAT EXCHANGER Original Filed June 6, 1940 3 SheetsSheet 1 3nventor 6Q Nani/e //L4%ziw/ (I ttorneg G. D. MANTLE HEAT EXCHANGER Oct. 19, 1943.

Original Filed June 6, 1940 3 Sheets-Sheet 2 m n! I I 1 i n J a 7 f FIE r w) K. J a 2H. 9U 3 2. 2 P. ML/ vy 2 3 2.. .I nw J 6 5 9 M M i 7 10L M/ 1 w 7 Oct. 19, 1943. G; D. MANTLE 2,332,450

HEAT EXCHANGER Original Filed June 6, 1940 3 Sheets-Sheet 3 4 Zhwen or W a. QMa/ir/e Gttorncg Patented Oct. 19, 1943 by mesne assignments, to General Properties 7 Company, Inc., a corporation of Delaware V Substituted for abandoned application Serial No. 339,129, June 6, 1940. This application April 19, 1941, Serial No. 389,421.

a November 29, 1940 In Great Britain Claims. (01. 257-231) This application is a substitute for my application filed June 6, 1940, Serial No. 339,129.

' The present invention relates to a heat exchanger and more particularly to a recuperator comprising tubes which depend from an overhead support'adapted to serve as a closure for the top side of a heated chamberor. flue and the object of the invention is to provide improvements in means for supporting the tubes in a manner to permit them tobe readily disconnected from the overhead support for inspection and repairs- In the drawings- I Fig.1 is a plan view showing how a number of the improved recuperator units maybe disposed side by side in spacedre'lation above a conduit for hot flue gases, one of the units having a portion of its top wall broken away to expose a constructional feature;

Fig. 2 is a vertical section on line 2- 2 of Fig. 1;

Fig. 3 is a greatly enlarg'ed'detail plan view on line 3-3 of Fig. 2 with parts in section, the sections of quadrants a and 27 being taken on lines a-,-a and 12-h, respectivelymf Fig. 4;

Fig. 4 is a vertical section on line 4- 4 .of Fig. 3; 1

Figs. 5 and 6 are fragmentary perspective views of the inner and outer tubes respectively shown in the'preceding views, and

Fig. '7 is a vertical cross section of a. modified form of the invention, the view being crosswise of the air distributing box.

The improved recuperator comprises an air box l2 adapted to serve as a closure for the top of a hot flue gas conduit H.. As shown in Fig. 1, a number of these boxes may be arranged side by side and be connected to common air headers I3 and it, each box having its own air inlet and outlet and 16, respectively.

Positioned in the conduit II to absorb heat from the hot gases flowing therethrough are tubes l3 which depend from the air box l2, the lower end of each tube being closed. When a plurality of boxes are arranged side by side as shown in Fig. 1, the tubes of one box will preferably be staggered with respect to the tubes of the next adjacent box for better heating as will be readily understood. I'he number of tubes ll] associated with each box will depend on the sizeof the tubes and onthe size of the gas conduit H as will be readily appreciated.

The bottom wall of the air box is indicated at 23, its top wall at 2| and its side walls at 3A. The top wall 2| is detachably secured to the side walls in any preferred way topermit access to be had to the interior of the box for reasons presently appearing. A partition wall I! divides the box into uppcr and lower compartments l8 and I9.

Extending through the partition wall I! and through the bottomof the air box is a series of sleeves 23 through which the tubes Ill, extend out of the air box. As best shown in Fig. 4., each of these sleeves extends some distance above the partition wall and is surrounded by a sealing material 36 which can be poured into the upper compartment. Extending across the upper compartrnent between the air inlet 15 thereto and the next adjacent sleeve-23 is a barrier wall '35 to prevent said sealing materialirom running out of the upper compartment by. way of said air inlet, l5. A similar barrier wall may be provided inwardly of the opposite end of said compartment for the purpose of limiting the surface area covered by said material. 1

At the upper end of each tube It is a circumferential flange 2'6 and depending from this flange is a collar 25 for dipping into the sealing ma terial 36. The collar may. rest on the wallll and thus also serve as a support for the tube It.

However, thetube may be otherwise supported.

'For example, the upper end 24 of the'sleeve 23 might just as well engagevwith the underside of the-flange 26 instead of being spaced therefrom asshown. r I Extending into the tube It] is atube 21, the

tubes being in radially spaced relation to form a flow passage 28' between their adjacent walls. Upper and lower spacer lugs 29 may be employed for centering the tubes. At the upper end of the tube 2'! is a circumferential flange 3| and depending from this flange is a square collar 33 for dipping into the sealing material 35. The collar may rest on the wall H and thus also serve 'as a supportfor its tube 2l.'- However, the tube the inner tube 21 is in direct communication with the upper compartment l8 of the air box whereas the upper end of the outer tube I3 is not because of the hood formed by the collar 33 and flange 3! of the inner tube 2?. However, the upper endof the outer tube In is in communication with the chamber 33 formed by the said hood and the chamber 33 is in communication with the lower compartment I!) by way of a plurality of upright conduits 32 which extend through the partition wall I1, it being understood that these conduits are surrounded by the sealing material 35. The primary purpose of making the collar 30 of the innertube 21 square is to permit four large size conduits 32 to be employed, one at each corner of the collar, rather than a greater number of smaller conduits as would necessarily be required if the collar were circular.

It will now be understood that the air to be heated flows into the inner "tube 2 7 from the upper compartment l8; thence upwardly in the space 28 between the two tubes I and 21 to the chamber 33, and thence downwardly throug-h'the conduits 32 into the lower cor'np'artm'ent 19.

To remove the tubes H] and 21 from the "box l2, the top cover 2| of the latter is first removed after which the inner tube 21 is first lifted out and then the tube In. The simplicity with which the tubesmay be removed from the 'air'bo'x is obviously of great practical importance from the "standpoint of repairs.

The Sealing material 3'5 is preferablylead which may or'maynot'remainmolten.' Topermit free f'ilow' of the lea'd'on fbeing poured'to' form the seals btwenthe wall 17 and the collars '25 and '30,

the collars maybe notched as indicated'at "41 and 42, respectively.

To protect the bottom wall 20 of the air "box against objectionable heating by the hot flue gas, a layer-of insulating material may be'secured' t'ofthe underside of the'wallin'any'preferred way 'asfby hanger rods 38.

Intherimdified 'form-of the invention shown 'ln' Fig. '7, 12' indicates an air box which like the air box" is adapted to bedisposed above a hot gasflue conduit not shown but corresponding to the'conduitl lin Figsfi'l and 2. The bottom wall of the box is indicated at 45, its side walls at 4'6 and its top wallat 41, the latter being shown as "ifemovably secured to the boxby clamping means "#8. compartments and 50 by'a common partition The box is divided into 'upper and lower walll. At one end of the upper compartment is an-air inlet not shown'but corresponding to "theinlet 'l5'in Fig. 1 'andatone end of the lower "compartment'is an air outl'et not shown but cor- 85 and 5| are circular tr'ou'ghs52 and '53, respectively. Extending out of the box 1 2 are two concentric tubes '54 and 55, the tube 54 being closed 'at'its lower end and it beingalso understood that 't'he'tube 54 is externally heated by the hot flue The upper end of the outer tube'54 has a downturned peripheral flange 56 for seating in the trough 52 and the upper end of the tube 55 has a downturned peripheral flange 51 for seating in the trough 53. Sealing material in the troughs provides 'a gas tight seal between the flanges and their respective troughs. It is to be understood that the tubes are supported in the position shown by their flanges. The air to be heated flows 'from the upper compartment 49 downwardly through the tube 55, thence upwardly in the space 58 between the adjacent wallsof the tubes and then into the lower compartment 59. If desired an adjustable valve 59 may be provided at the top end of the inner tube to control the air flow.- I

To remove the tubes from their setting the top wall 41 is removed after which the inner tube 35 is'first lifted out and then the outer tube 54,

indicates the insulating material of next adjacent air boxes and 62 an insulating brick or the like between adjacent boxes.

What I claim is:

1. In apparatus of the class described, the combination of a support having upper and lower compartments separated by a partition wall, a

first tube depending from said support, the upper 'enddf the tube being above said wall, a collar secured to and surrounding the upper end of the tube in spaced relation, a second tube depending from said support and projecting downwardly into the first tube in spaced relation to form an air passage'between the tubes, the upper end of the inner tube being above the upper end of the outer tube, a collar securedto'the upper end of the inner tube and surrounding the 'collar of the outer tube in spaced relation, and means for establishing a gas connection between the lower compartment and the space encompassed by the collar of the inner tube.

2. In apparatus of the class described, the combination of a pair of upright tubes, one within the other in spaced relation to form an air .passage between the tubes, means forming a container for sealing material around but out of contact with the outer tube, a collar secured to and surrounding the outer tube for dipping into said sealing material, a collar secured to and surrounding the inner tube for dipping into said sealing material, the collar of the inner tube being of a size to encompass the collar of the outer tube and having its top above the upper end of the outer tube whereby to form an air chamber above the said sealing material.

3. 'In apparatus of the class described, the combination of means forming a box having upper and lower compartments, a first tube having one end in the upper compartment and extending downwardly through and beyond the lower compartment'for external heating outside of the compartments, a second tube having one end in the upper compartment and extending downwardly into the first tube to form an air passagebetween the tubes, means within the upper compartment cooperating with the upper end of the inner tube and with the bottom of the upper compartment to seal off the upper end ofthe outer tube from the upper compartment, and means for establishing a gas connection between the lower compartment and the upper-end of the outer tube.

4. In apparatus ofthe class described, the combination of meansforming a box having upper and lower compartments, a sleeve extending from the upper compartment through the lower compartment, a first tube having one end in the upper compartment and extending downwardly through and beyond the lower compartment by way of said sleeve for external heating outside of said compartments, means in the uppercompartment forming a container for sealing material around but out of contact with the upper end of said tube, an annular sealing flange carried by the upper end of said tube'fc-r dipping into the sealing material in said container, a second tube having one end in the upper compartment and extending downwardly into the first 'tube-tolorm an air passage between the tubes, means carried by the upper end of the second'tube for sealing off the upper end of the first tube from the upper compartment, and means for establishing a flow connection between the lower compartment and the upper end of said air passage.

5. In apparatus of the class described, the combination which comprises a structure adapted to overlie and bridge a heated space between two upright walls, a first tube supported by said structure and depending therefrom for external heating in said space, a second tube projecting downwardly into the first tube and having at its upper end an outwardly extending peripheral flange by which it is detachably hung on said structure, the lower end of the first tube closed and said bers of which one is in air connection with the top of the second tube and of which the other one is in air connection with the top of the air passage between the tubes so that air can be conducted from one of said chambers to the other by way of said tubes, said second tube being with drawable from the first tube by upward displacement, and a trough for sealing material into which the rim of said flange dips, the trough surrounding the second tube in such spaced relation as to permit the first tube to be removed from said structure by upward displacement after the second tube'has been removed from said structure.

GREGORY D. MANTLE.

structure comprising walls forming two air cham-

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