US1891705A - Heat exchanger - Google Patents

Description

Dec. 20, '1932.- r F. x. J. A. DELAS HEAT EXCHANGER Filed May 17. 1932 QELZSNTOR 5041. E RIM only at separated points and between Patented Dec. 20,

UNITED STATES PATENT OFFI rmgois xav'nm JOSEPH mam mums; or rams, rmcr:

HEAT EXCEANGEB Application filed Kay 17, 1982, Serial No. 611

of heat is much lessened and it becomes necessary from time to time to remove said scale. Thls may necessitate stopping the apparatus for a long time, when the hardness of the scale renders its removal diflicult- It has been already proposed to clean the pipes from-said scale du-rin the working and ust when they are formed, y slipping on the pipes tubular members of greater diameter which, consequently, lean on the pipes by a generatrix, said members being rotated, say by the movements of the fluid inside which they bathe. Such a device presents'several drawbacks; it is necessary to take in ieces the apparatus if a tubular member is to removed and another one substituted therefor; ontheotherhand the tubular members having substantially the same length as the pipes do not bear regularly thereon, the pipes have of course a sag the value of which depends on their size and nature, the tubular member presents also a sag having another value; thus, the tubular member touches the igip'e ese . latter a layer of scale could remain on the pipe without beingtorn away therefrom since the tubular member did' not rub thereupon. The invention has for its object a device avoiding said drawbacks, shaft in such a way that it may be easily rotated; on each pipe are slipped a number of tubular members of small length, say lO-to 15 cm.v in order that the practically touch the pipes along their who e length, said memrs are counterweighed in order to cause them to keep always the same angular position during the rotation of the set of pipes, and thus to rub on. the surface of said pi instead of rolling thereon; and. to allow said supported by a motor (not shown) 'to rotate shafts 5, 6, boxes members tobe easil they are slotted a1 being smaller than corresponding resilient enough porarily expanded when is put in place or removed.

The following is,

closure of an vention, with Fig. 1 is a view of an tron;

Fig. 3 is a Fig. 4 shows in crossof the tubular member.

,aoc, and in rune September 28,1831.

y put in place or removed, ong a generatrix, the slot the outer diameter of the pipe, and the member being to allow said slot to be temthe tubular member by way of example, a disapparatus according to the inreference to the accompanying drawing in which: I diagrammatical cross-sectional cross-section of the same;

apparatus ccording to the invenpipe with the tubusection a modification Fig. 1 shows a device according to the in- 'vention which maybe used by instance for ater in order to obtain llation, but is not reevaporation of sea w fresh water by disti stricted to said use. p

The aparatus comprises a'casing 1 provided with an inlet aperture 2 by which the sea waterarrives inside, and with an outlet aperture or exhaust 3 by which the steam produced flows out towards a condenser.

On two opposite walls of easing 1 are disposed fluid which passtu tubular shafts 8, 9 by which outlet pipes fluid arrives keyed a pull t lght bearings 4 and 5 through said are ended in fluid-tight joints 10 and 11 by ular semi-shafts 6 and 7 they are connected to inlet and which the heating and flows out. Shafts 6 and 7 ey 21 allowing by means to and communicate with two 12, 13 connected the one with set of pipes 14. On shaft 5 is ofa 12, 13 and'set of pipes 14. The heating fluid,

by instance .high

pressure steam, heats the sea water across the walls of pipes 14, and

assaid evaporating,

. solved salts,

sediment has on the warm the sea water deposits the disand as it is well known this a tendency to deposit walls of pipes 14, and toscale thereon thus preventing the transmission of the heat from the inside to the outside of said pipes. In order to tear out said scale and according to the invention a number of tubular members 15 are loosely slipped on each pipe 14, each member 15 having a length substantially equal to 10 to 15 centimeters.

Figures 2 and 3 illustrate the manner in which members 15 are made and put in place. Said members present a generally tubular shape but the thickness of said tube is not uniform and is much greater in 16 than elsewhere. Owing to such dissymmetry the portion 16 of the tube being the heaviest one remains always in the lower part during the rotation of the set of pipes 14, part 16 plays thus the part of a counterweight, it is then obvious that member 15 shall consequently rub on the upper generatrix of pipe 14 and since, during the rotation, each generatrix of pipe 14 and since, during the rotation, each generatrix of pipe 14 is at its turn the upper one, the whole outer surface of pipe 14 shall be rubbed by tubular member 15, said friction tearing out the sediment just as it is formed. Owing to the slight length of members 15 their sag is practically zero and thus the members touch the corresponding pipes along their whole length. As said members are allowed to take a slight longitudinal displacement, the gaps between them do not remain always just in the same places and so the whole surface of the pipes is swept by said members 15.

Asstated above tubular members 15 are longitudinally slotted, said slot 17 having a width a little smaller than the outer diameter of pipes 14 in order to maintain member 14 thereon, as tubular members 15, especially in these thinnest parts, have sufficient resilency, when it becomes necessary to put in place or to remove them, it is easily done by exerting a strain on both edges of the slot for widening this latter enough to allow thepipe to pass therethrough. It is thus easy as well to remove a worn off tubular member as to put in place a new one. 1

The scale worn off by the action of members 15 falls to the bottom of the casing and is exhausted therefrom say by an aperture 22. 7,

Fig. 4 shows a modification of the tubular member constituted by a slightly curved strip 18 leaning on the pipe and aheavy stem 19 playing-the part of counterweight; strip 18 and stem 19 being connected by resilient rings 20 partly broken to form slot 17.

Of course it is advantageous to make the rubbing members 15 or 18 of a material softer than that of the tubes in order to avoid the wearing off of these latter.

' What I claim is:

1. An apparatus for exchange of heat between two fluids comprising a set of pipes,

- means for causing one fluid to circulate ining it in the same angular position during the rotation of the set, each ofsaid members being provided along a generatrix with a slot the width of which is smaller than the outside diameter of the corresponding pipe, said members being resilient enough to allow said .slot to be enlarged so that the width thereof becomes larger than the diameter of the corresponding pipe.

2. An apparatus for exchange of heat according to claim 1 wherein a number of slotted and counter-weighed tubular members, each having a length of substantially 10 to 15 centimeters, are loosely slipped on each pipe. 1

In an apparatus for exchange of heat between two fluids according to claim 1 tubular slotted and counterweighed members each consisting in a slightly curved strip, a heavy stem, resilient broken rings connecting said strip and said stem.

4. An apapratus for exchange of heat between two fluids according to claim 1 comprising a casing, means for causing one fluid to circulate therein, two opposite bearings provided in the walls of said casing, two tubular semi-shafts journalled in said bearings, two hollow boxes fastened on the ends of said semi-shafts, pipes parallel to the axis of said shaft connecting the two boxes, means for causing the other fluid to flow through said shafts, boxes and pipes, on each pipe slotted and counterweighed tubular members in the bottom of the casing, an exhaust for the scale taken oflf the outside of the -pipes by the friction of the tubular members.

In testimony whereof I have aflixed my signature.

FRANCOIS XAVIER JOSEPH ALBERT DELAS.

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