US2259604A - Heat exchanger - Google Patents

Description

D. B. BANKS EAT EXCHANGER oct. 21, 1941.

Filed Sept. 2l, 1959 3 Sheets-Sheet l Oct. 2'1, 1941. D. B. BANKS HEAT EXCHANGER Filed Sept. 2l, 1939 3 Sheets-Sheet 2 D f 006009600000091... am

Oct. 21, 1941. D. B. BANKS 2,259,604

HEAT EXCHANGER Filed Sept. 2l, 1959 5 Shee'cs-Sheefl 5 `Patented Oct. 21, 1941 UNITED STATES 2,259,604 HEAT EXCHANGER Daniel B. Banks, Drexel Hill, Pa., assignor to Sun Oil Company, Philadelphia, Pa., a corporation of New Jersey Application September 2.1, 1939, Serial No. 295,928

Claims.

The present invention relates to a heat exchange apparatus of the shell and tube type and, more particularly, it relates to-a removable baille means for use in such apparatus.

It is an object of the present invention to provide heat exchange apparatus which may be readily assembled and dismantled for the purpose of cleaning and the like. It is a further object of the invention to provide a readily-removable baille plate which will provide a tight seal between the baille and the walls of the exchanger. Other objects will be apparent as the description progresses.

For a better understanding of the present invention, reference should be made to the accompanying drawings in which Fig. 1 is a longitudinal sectional assembly drawing of the apparatus, 1 h

Fig. 2 is a section taken on the line 2-2 of Fig. 1,

Fig. 3 is a section taken on the line 3-3 of Fig. 1,

Fig. 4 is a detail of the end of the baille at the manifold end of the exchanger showing the mechanism for spreading the baille bars at that end,

Fig. 5 is a detail section taken on the line 5-5 of Fig. 4,

Fig. 6 is a detail section taken on the line 6-6 of Fig. 4,

Fig. 7 is a detail of the free end of the baille,

Fig. v8 is a detail section taken on the line 8-8 oi' Fig. 7, and

Fig. 9 is a detail section taken on the line 9-9 orma-i.

Referring now to the drawings, I0 designates the cylindrical body of the heat exchanger which is provided with flanges II and I2 atthe ends thereof. A tube sheet I3 is h eldbetween the flange II and the cylindrical manifold I4 provided with a central web I5, and the end of the exchanger is closed by cover I6. Inlet and outlet lines I1 and I8 are provided in the manifold I4. 'Ihe other end of the exchanger is closed by a cover bolted to flange I2. Heat exchange tubes 2| are rolled into the tube sheet I3 'and a tube sheet 22. A floating header is formed by tube sheet 22 and cover plate 23 bolted to a segmental ring 24,l the tube sheet 22 being held between the cover plate 23 andsplit ring 24.

A central baille 25 described hereinafter in detail is disposed within the cylindrical body I0 of the exchanger. The baille 25 is held against the tube sheet I3 by means of tie rods 21 which pass through the tube sheet I3A and extend beyond the opposite end ofthe name 25,. A clip 2s passes 55 'mental overl the end of the baille 25 and the ends of the tie rods 21 on the opposite sides of the baille pass through the clip 28 and by tightening the nuts 29 on tie rods 21 the baiile may be pushed rmly 5 against the packing 3| in a groove 26 provided in the tube sheet I3 to receive the end of the baffle 25.

Referring now more particularly to Figs. 3, et seq., the bale 25 is formed of two plates 32 and 33 spaced from each other by spacers 34 and held together by rivets 35. A longitudinally extending bar 36 is disposed between the plates 32 and 33 at each edge thereof. Suitable packing material is provided at the outer edge of the bars 36. As shown in the drawings, this packing material may comprise a compressible packing material 31 which is held in place on the edges of the bars 36 by a retaining band of a suitable material 30 such as asbestos cloth. This retaining band 36 is stretched over the compressible material 31 and is itself secured to the sides of the bars 36 by any suitable means such as rivets. At the ends of the bars 36, nearest the floating head (Fig. 7), an enlarged plate 38 is welded to the end of the bar. 38 and a round plug 39 is inserted therein having a threaded hole adapted to receive the spreader bar 40 provided with opposite threads at its opposite ends. An opening 4I is provided in each ofthe plates 38 through which the threaded ends of the spreader bar 40 may pass. A plate 43 is Welded to the opposite ends of the bars 36, nearest the tube sheet I3. (Figs. 4, 5, 6 and 9.) These plates 43 extend toward the center of the baille 25 and are provided with a V groove 44 at their ends. A pointed bolt 45 extends through a hole 46 in the tube sheet I3 and a collar or nut 41 is threaded on to the bolt 45 and is adapted to bear against the tube sheet I3. A cap 48 may be threaded to the tube sheet I3 to cover the end of' the bolt 45 where it extends therethrough. A cylindrical well 49 may be provided in the central web `I5 of the manifold I4 in the event that the exchanger is a two passexchanger so that the manifold I4 may be drawn tightly against the tube sheet I3.

y From the foregoing description, the method of assembling or disassembling the apparatus and the manner of its operation will be readily ap- 50 parent. For example, whenit is desired to disassemble the apparatus, the cover 20 may be removed from one end of the apparatus and the cylindrical manifold I4 removed from the other` end of the apparatus. The cover 23 and the segring 24 of thel oating header may then A hole isrdrilled in the plate drawn from the V groove 44 at the end of the plates 43 thereby releasing one end of the bars 36.

. The other end of the bars 36 may be released by turning the spreader bar 40 so that the ends of the bars 36 are drawn toward each other thereby moving the packing 31 away from the walls of the casing I0. The tube bundle with the baffle 25 therein may then be withdrawn from the body I of the exchanger by pulling out on the tube sheet I3. After the tube bundle has been removed from the exchanger, the baille 26 may readily be removed therefrom by loosening the nuts 29 on tie rods 21 thereby permitting the clips 28 of the ends of the baille 25 to be removed and permitting the baille to be slipped out of the tube bundle.

In assembling the exchanger, the tube bundle, with the baille in place therein, is inserted into the body I0 of the exchanger, the bars 36 of course being in their contracted position during insertion with" the pointed bolt 45 being withdrawn thereby permitting one end of bars 36 to be moved toward the center of thebaflle and the other end of bars 36 being held in by spreader bar 40 so that the tube bundle may be inserted without damaging the packing ,on the baille. When the tube bundle is in place in the exchanger, the pointedbolt 45 is inserted and its end forced into the V groove 44 thereby moving the plates 43 and the attached ends of bars 36 outwardly. Very little force is applied by bolt 45` to the bars 36, its object being merely to change the fulcrum point of these bars at one end of the baille so that as the spreader bar 40 is turned forcing the other end of the bars 36 outwardly a tight seal will b e made between the walls of the body of the exchanger Illvand the baille. As the bars 36 are forced apart by turning the spreader bar 40, the packing 31 is compressed and the retaining band vof packing is forced against the side walls of the exchanger and also against the inside of plates 32 and 33 forming the baille, so that a tight seal is made and practically all of the sealing is accomplished by turning the spreader bar 40. The heads of the exchanger may then be attached and it is ready for use.

What I claim and desire to protect by Letters Patent is as follows:

1. InV a heat exchange apparatus. the combinalongitudinal baile adapted to be inserted in said casing and comprising a pair of spaced apart parallel plates, a longitudinal bar inserted between said plates at each of the longitudinal edges thereof, said bars being of greater length than said casing and having a threaded opening in their ends nearest said smaller tube sheet, a spreader bar having opposite threads at-its opposite ends engaging said threaded openings, tie rods passing through said larger tube sheet and extending to the far end of said baille, means for attaching said tie rods to said bafile at its end nearest said smaller tube sheet to thereby press said baille against said larger tube sheet. extensions on said longitudinal bars at their end nearest said larger tube sheet extending toward the center of said baille, and a bolt having a pointed end extending through said larger tube sheet, and adapted to enter between said extensions on said longitudinal bars and force them apart.

3. In that type of heat exchange apparatus which comprises a cylindrical casing, tube sheets and a bundle of tubes extending between the tube sheets and removable with the tube sheets from the casing, a baffle comprising a pair of spaced apart yparallel plates extending from one tube sheet toward, and terminating short of, the

tion with a casing and a tube bundle adapted to be inserted therein, of a longitudinal baille comprising a pair of spaced apart parallel plates, a longitudinally extending bar inserted between said plates at each of the longitudinal edges thereof, a spreader bar at one end of said longitudinal bars, said spreader bar being provided with opposite threads on its opposite ends, a'

threaded opening in each of said longitudinal bars adapted to receive one end of said threaded spreader bar, and a wedge adapted to be inserted between the other end of said longitudinally extending bars to spread them apart while said tube bundle is within the casing.

2. In a heat exchange apparatus, the combination with a casing and a tube bundle adapted to be inserted therein. said tube bundle comprising a relatively small diameter tube sheet which is adapted to pass through said casing and a rela- .tively large diameter tube sheet which is adapted to abut against one end of said casing and close the same and a multiplicity oi tubes oi greaterother tube sheet, longitudinally extending bars between said plates at opposite longitudinal edges thereof, sealing means betweenY the longitudinal edges of said bars and the inner wall of said casing, and means to spread corresponding ends of the bars laterally toward the casing; the improvement which comprises wings extending inward from the other ends of said bars tosaid bars and operable to be moved longitudinally between the inner ends of said wings and thereby spread the corresponding ends of the bars laterally to so position their fulcrums as to enable said bars to compress said sealing means and thereby make a tight seal between the longitudinal edges of the bars and said casing throughout the length of the bars.

4. In that type of heat exchange apparatus which comprises a cylindrical casing, tube sheets and a bundle of tubes extending between the tube sheets and removable with the tube sheets from the casing, a baffle comprising a pair of spaced apart parallel plates extending from one tube sheet toward, and terminating short of, the other tube sheet, longitudinally extending bars between said plates at opposite longitudinal pair Lof said tie' rods and spanning said end of the baille, means to press said cross-pieces against said end of the baille and thereby force its other end against the `first named tube sheet, a member extending through-the first named tube sheet .and operable to spread the corresponding ends of the said 'bars laterally against the casing wall and fulcrum the same thereon, and independthe ends of the bars operable bythe spreading ently operable means to spread the opposite ends member comprise inwardly extending wings and of the bars, thereby compressing said sealing in which said spreading member extends along means to make a tight seal between the longithe axis of the casing and is movable longituditudinal edges, 0f the bars and Said casing 5 nally between said wings to effect the spreading throughout the length of the bars. action specied.

5. The construction dened in claim 4 in which DANIEL B. BANKS.

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