DE1401676A1 - Process for the ribbing of heat exchange surfaces with corrugated strips - Google Patents

Description

Abren zur BerippLt-g ## of # 'noise exchanger surfaces with #Ne llbänder. In the manufacture of corrugated ribbon ribs with ribs on the outside, a known process is used to combine the -, 'i'ell tape in a special final form., #.

U ci on the lohr to be ribbed: t-, elt and ducch dirwärmun- to 1.2 C2

the melting temperature doo LötiLitt ("# ls on the tube t-2 -.-- soldered ;. at The Inaei2.berippun- of pipes i., with corrugated tapes is - according to a different method the finished-corrugated wool ribbon first; wound up on a tube that is in diameter something more than the Zweifaeba

19.ellband rib height is smaller than de2 inside diameter of the rib to be ribbed Heat exchanger tube res, then a flat solder foil tape is placed on the outside of the corrugated tape wound up and this system

f2 tz inserted into the heat exchanger tube. #Iliruiehr the inner tube is enough so the corrugated tape, resp. the soldering: Collen tape to rest on the inner surface of the heat exchanger: tube and it can now be soldered by heating.

Various deficiencies adhere to these known processes, which make the proper production of corrugated tape pipes very difficult, so that the production costs are high. For example, the corrugated tape itself is very dimensionally stable and can therefore only be brought into contact with the pipe surface with relatively little pre-tension even when it is cold. With the high level of heating required for the soldering, this already slight preload is almost completely lost and , for example, under the influence of the inherent geivicÄ * - #, ts of the band, a lifting from the hollow surface can occur, so that at this point there is no Mtung is possible. Ljan must therefore z. Tl use relatively expensive solders with a low melting temperature, among other things, not to let the heating during utering become too high. In addition, very tight tolerances are to be set in the manufacture of the inner ribs, since the expansion of the inner tube is only possible within certain limits2 because the line connected to the diameter, size, is extended of the inner tube in a disturbing manner. As a disadvantage can be iverten further that the Inn2nrohr In ferti -, - en heat exchanger tube ver - remains, so that a kgaterialaufwand is required at a location "lärrieaust '; ausch itself nothing beit-ra" to t, - the inner -

# ci

The pipe is also one-sided # -, closed and itself not flowed through by the heat exchange (-, n, that is, there is "a dead woman in front of it" which influences the building, röije and other things.

The above-mentioned disadvantages can be reduced by the following - 0

Avoid the present invention described method. The reason for this is based on the fact that one or more iqell tapes are connected to the wall of the heat exchanger before being soldered to the wall of the heat exchanger - first by means of point or roller cutting or by soldering - with a slightly veined or completely non-corrugated tape which in turn is brought into contact with the edge of the heat exchanger with the aid of a Mmittelä and then soldered to it at a temperature that is below the soldering repair of the solder 9 that in an approx.

In particular, he - just sien benefits' EADERSHIP when carrying aes Ver - that for dielVer semäß the invention -fahrenß when the Beifügun -

The soldering of the band with the heat exchanger surface is required by the fact that before the soldering, a form-fitting connection between the band and the soldering material is made in this way -

wirdt provides that one or more öffnun-en on the upper Ue U h belly,

f Smile Friend of `# JIärmeaustauschers towards -erie ended side ver10.

through which the soldering material can emerge at the soldering "., aaz 'or partially se. It can furthermore be particularly advantageous if the side of the tape adjoining the heat exchange surface is provided with a corrugation or the like is. or-the band with a weak V-iollu-til-, from - leads i "jird. .. When Außenbe rippun1 from lächen especially pipes can special Before '- 21le dadurc.L .1 .3

-i er-praise that the berippto T and (2) under -. *. 'irk -.-. # n one in the Beundos jierichteil Vor -spanni #: raft 3-Li-f dis, is applied2 which in special Fall: Dri so nro # '# be.' Ban that '-Iie

des B.-uidniaberials dbersci, riü't, -en Vorteil-2 er-Oben sich, unt3r that with V'orsliani7i "kl-, ra: Ct on the

surface on - edräc, #, -. th tape eLie, foil --us # .2

will "t.:Lie beIä - also ui # er ciner pres-oa-nn.Izruft stands. At the Innenberi 0 Z-)

.pl) un vorzu #

It is particularly advantageous to connect the oüor U'ic to the tape which '"' iellb.Inuler on a cylindrical open to -Y Nominal after #, vIlol #; ter fastening of tape or '- "all tape on the pipe to be ribbed starting from the above-mentioned fastening point i a in the axial direc- progressive Drelimonient such from eübt -. ,; IIRD that sic.11 CIIC Du.-chmesserver, -. rÖPeruil # - of, auiniehr coming to rest against the inside --it lRohres' he jellbandsystems. .-ibt. With a -uevor - "" jl, -, cn Vorf, - # hren this will be the -.) UrchmesserverZ, -size-7 r '

rtin-- des ov "ir-.ende through a through different 'wave height-, connected with the band Nverden. In special cases there are advantages if two or more liojende '#'. ; * are offset from one another.

FiG ,. 1 shows the existing corrugated band and band corrugated strip -. System prior to the soldering of the tape with CLER Wärmeaustauscherflächeg% Vähi-end In Figure 2, ad an example shown ISTT As the Wellbaadeystem in Außenberippun .. a tube is auf3ebracht.

Own 2.a and 2b show exemplary embodiments of the belt with utmaterial connected in a form-fitting manner.

F sharp. 3 to 7 show examples of application for the implementation of the method with internally finned tubes, fi. FIG. 3 shows the AC winding of the corrugated tape system on a cylindrical assembly rod, while in FIG. 4 the corrugated tape system is already inserted into the pipe to be heated inside.

Pts. 5. to 7 show other corrugated tape arrangements with doll zu, 3ehö -ri-en 1Y-, onta-ovorrichtmi - s, which at Iiuieiiberippun-r for the he - ;. 1 1 ci t>

Required enlargement of the diameter Ües' jcllbancLsyetems can be used for soldering.

Fi3. Fig. 8 shows an embodiment of the corrugated tape system with a light; corrugated band which, depending on the degree of corrugation, has a different deformation -

C> fortune own Icaan.

At Pi. 1 is the corrugated tape system (11 2) consisting of multi-tape (1) and tape (2) before the end of the line with the '.,!, - Z = over; ra, .aungswand ID

reproduced. The connection between #t "v-ei-ibancl (1) and volume (2) CD -U

can be provided by point or roll cutting, but also soldering. In this one, the soldering temperature used for the subsequent connection of the i3andes (Z) at the heat transfer must be lower than the melting temperature of the for the previous connection of corrugated tape (1) and tape (2) Lötmaterialst used for const would this Ver - bond may be unsoldered again in the subsequent soldering.

Fig. 2 shows as an application example of the method the outside u

finning a tube (3) with the corrugated strip system (1, 2) which wirdt spirally wound with the interposition of a Lötfolienbandes (4) on the tube (3) wherein a Vorspannk a t X is - turns will, which can be as large as necessary, that the yield point of the tape (2) is exceeded. In this way, according to the invention, a very close contact of the band (2) on the outer wall of the tube (3) can be achieved via the possibly intervening solder foil (4), especially when the solder foil band (4) is also wound with pretension Even with very strong heating during soldering, the tape is not expected to lift off the pipe ", since the tape is firmly attached

and it is already much more dimensionally stable than a, according to the known method, loosely wound corrugated tape.

Ne is often useful "to connect the corrugated tape (1) obliquely to the tape (2) that after winding on the tube (3) the line of contact between the corrugated tape (1) and tape (2) runs approximately parallel to the tube axis This oblique position

depends not only on the width of the tape (2) but also on the diameter of the pipe (3) and on the number of corrugated tape systems (1, 2) wound on at the same time. With such a

Inclination is not only achieved a full support of the band (2) on the surface of the tube (3) , but there are also aerodynamic advantages.

In the example shown in FIG. 2, between band (2) C>

I and the surface of the tube (3) a utfolienb * and. (4) placed between them. It is also possible, however, to wind an weed wire together with the corrugated tape system (1, 2) onto the tube (3) next to each corrugation system. Furthermore, the band (2) can have a soldering agent layer * on the underside, for example produced by Walsplattleren, so that the supply of a separate soldering foil strip or a soldering wire is unnecessary. The solder foil (4) can also be gem-Fi .2a with the belt (29) form -. Be positively connected, viobel_die not closed, the reverse - laid side edges this- belt (21) have a hinreiche4d large distance to permit the passage of the To ensure lathing material. When the corrugated strip (1) angellötet on the belt (21), the crimping is done the Löttolie (4) in the band (21) useful only after the soldering of corrugated strip (1) and belt (21), since in this case the crimped Ioötf olie must have a lower melting point than the soldering material used for soldering the corrugated tape (1) and tape (20).

Similarly, according to Pig. 2b the uta material required for soldering is crimped in wire form on one or both laterally protruding edges of the band (2 "')

On the addition of the soldering material19 when wrapping the pipe (3) with the corrugated tape system. (1, 2) can be completely dispensed with if the pipe (3) is previously soldered according to one of the known

Procedure was overdrawn.

That in Pig. 1 shown corrugated tape (1) is attached at an angle to the tape (2), but it can also be soldered straight on. Further, the height of the waves can be changed periodically in a known manner we. # Certain contour shapes to achieve the the completely wound corrugated strip tube, for example, rectangular, square, hexagonal, or the like .. Bbenso If it is often expedient for the distance between the Verbindungestellen between corrugated strip (1) and Band (2) should be chosen so that a.-B. after the spiral winding of the pipe, a displacement of be in the direction of flow The ribbon. (29 219 211) can, according to the invention, be provided with a flare or the like on the side adjacent to the heat exchanger surface, in order to ensure that the solder flows safely into the connecting element when certain soldering materials are used. A similar effect can be achieved if the baad (2t 21, 211) as a whole experiences a weak lump in short costs, which, however, must not be so great that the possibility of exerting a sufficiently high pre-tension when winding is thereby taken away . It is often very useful to use a band that is elastic to a certain extent, as it s-AIch results from such a weak corrugation, in order to compensate for irregularities in shape despite a sufficiently tight winding. von Dimonsbn .-. voränderun, #, - en to have available during the soldering. In the Ianenberippung pipes Bystem (19 2), as Figure 3 shows, the accelerator as Figure 1 is prepared, consisting of corrugated strip (1) and band (2) is first spirally wound on a cylindrical mounting -.. Wound rod (5). The band (2), which on the inner surface of the tube (3f) according to FIG. 4, possibly with an interlayer of Mt foil tape (4), is located on the outer diameter of the corrugated tape system (1, 2) 9, which is smaller than the inner diameter of the tube to be ribbed on the inside (31) . The soldering material can also be added in a different, quiet way, for example as in the examples given for the externally finned tubes.

While FIG. 3 shows the winding onto the rod (5) provided with the ribs (6) , in FIG. 4 the wound rod (5) is already inside the tube (31). In order to bring the band (2) to rest on the inner surface of the pipe (31), the band (2) or the band (1) is first connected to the pipe wall (31), preferably at one end of the multi-band, and then the cylindrical assembly rod (5) is pulled out axially and now, from the previously marked fastening point of corrugated tape (1) or tape (2) on the pipe wall (31), an axially advancing movement in the direction of the arrow in FIG. 4 Torque M for Eiiivjir.2: unG -approved. Therefor'

12 can, for example, be a rotating 113arste or dj1 in the sense of the torque M. can be used, which is preferably provided with steel bristles ven round or leaf spring-like rorm. At. In a prior-to-th execution, the 11-l jar diameter of this brush is made somewhat larger than the inside diameter of the rib-free interior after the band (2) has been placed on the inside diameter of the pipe. The position of each band (2) on the inner wall, 3 tubes (31) can possibly be improved, when it is done, #, ie in the area in which the band (2) is brought to the position, # e -, zjordjn should, Vi -

ZD CJ

Brations have been generated, for example by tapping the outside of the pipe (3). As a result, the frictional forces, which could be a hindrance to an application of the belt (2) to the tube (38) , are, under certain circumstances, considerably reduced, so that the application is varied.

Instead of the circular cylindrical assembly rod (5) , an angular profile, for example a square rod (51) 3 as shown in FIG. 5 , can also be provided. In this case, the heights of the ribs of the corrugated tape must be designed to be unequal to the cross in order to obtain a circular cylindrical outer contour of the tape (2) in this case as well. The assembly rod (5 ') can be used to bring the tape to rest on the inner surface of the pipe. after tape (2) or corrugated tape (1) have been fastened at one point on the pipe (3) - with a continuous',!. lir - 9

#ken one similar to Fig. 4 opposite # -esets the TJhrzci - ersinn gerich -LD ID Co (D teten moment LI acial out of the pipe-ezo ## en vierd., n. So that not the * "## Combine ellbandsystem rait d = rod (5t) as a whole zoom out, en is, k-gn n expediently at the ent-e-enrre

1.2 U ti # 2 Imi translated end of the corrugated belt system (19 2) has a stop not shown here pre-esehen Vierden "on the can support the Wellbandpeket ge -gebenenfalle axially If this stop längsver -. Ef.2irt pushed off, it may as a result, in a simple way between adjacent corridors of the spiral -, #. 'ellbandbewici #: elun a predetermined distance is set. An advantage of this arrangement -: # with periodically unequal rib heights is also to be seen in the fact that as Fol - ;, e the diameter expansion W

tion after the insertion, in the axial direction, - oine displacement 'of the longer and shorter TUIppen together result in "so that the ta 1: 2

Mixing of the flowing medium is promoted. za "iG. 6 shows another ümienciun, <s example for the Duzmh-rülumr4s of the Q

Procedural -, - emäL jer ll7, rf! Lduzig. The preparatory Uleilbandsystem (1, 2) is provided here on an Igiontagestab provided with continuous longitudinal ribs (6) on 3 winding-old "in the tube (31), 3 pushed and similarly as described in FiQ-3 '. 5 , on the #lohrinnenwavd (31) brought into contact with the ribs. Cor-a allows a much Size What # eas torque M to brin into effect, .. en than a similar voltage Anord 2ii 51 so daL the 4nlag.e to Uer. ilohrinnenwand ver beaije £ t is.

.Thus it is naturally possible to use a combination of the different methods. To bring the corrugated tape system (1, 2) to the * system 'by, for example, first inserting a mounting rod similar to C') or (6) .Trehnoment M is exerted and then a rotating brush, as with Pig. 4 is described, pulled through & pulled through.

In PIG. 7 shows an arrangement in which the llellband (1m) a6-t is provided with alternating long and short ribs, which results in better utilization of the entire pipe cross-section for the heat over javog. In a preferred embodiment, the longitudinal ribs of the assembly rod (61) are guided up to approximately the inside diameter of the shorter corrugated ribbon ribs.

Fig. 8 shows an embodiment of the corrugated tape system in which the tape (2t) between the contact points between two corrugated tape -tä: #ern with the Ba-liä is also 3-corrugated. Depending on the requirements, the strength of this corrugation allows the band (21) to expand which, with sufficient structural rigidity, allows expansion or pressure at the same time, which can bridge certain shape inaccuracies. ' A preferred embodiment provides that the band (2t) in the area between: 'two waves is made with one, the bai inner crippun, -p

U 42 Tleich odor is smaller than the "inner" Uus of the pipe to be finned. On (liese * '4-eise you get mainly at i: #ler contact point to mix -%'9'ellband (1) and band (29) a c-irr; iiandfri-, le Jmlage am, tohr (Y). In the examples shown in the figures, only one Ulell tape (19, 11) has been connected to one tape (2, 21), but it may be useful in certain cases to use two or more corrugated tapes of the same wavelength, one above the other, However, with different wave heights, to be connected with the tape (29 21). Also advantages are possibly achievable if several corrugated tapes (ll 119 111) lying next to each other are connected with the correspondingly wider tape (29 21), where * preferably bonacäbarte woolen tapes seen in the direction of flow $ can be tinted offset with respect to one another, eg by # / 4 wave length.

Claims (1)

ratentan92eche .. 1. 17 experience of the ribbing of '.' heat exchanger surfaces with corrugated ribbons, characterized by the fact that 'e-tin or several ribbons (1) are connected with a weakly intended or completely smooth ribbon (2) which, in turn, is not connected to its ripped side - with the addition of soldering material (4) with which Viand the heat exchanger, for example a pipe (3), is brought into contact and then soldered to it. / 5 - ", Verabxen according to claim 1, characterized in that one or more corrugated tapes are connected by means of spot or roller welding with a weakly intended or completely smooth tape (2), which in turn is connected to the wall of the heat exchanger with the addition of soldering material (4 ) brought into contact with it and then soldered with it. 3. Method according to spoke 1, characterized in that one or more corrugated tapes (1) 'wanted to be weakly or completely smooth tape (2) by means of soldering with ELnem which in turn is brought into contact with the wall of the heat exchanger with the addition of soldering material and then soldered to it, the soldering temperature when soldering the band to the heat exchanger surface is below the soldering temperature of the solder used for the connection between the or-the % Yellbänder (1) and the tape (2) was used 4. The method according to claim 1 to 3, characterized in that the contribution of the for d The soldering of the band (2) with the soldering material required for the heat exchanger surface (3) takes place because a positive connection between the band (2) and the soldering material is established before the soldering process in such a way that one or more openings on the surface facing the heat outlet. . exchanger directed towards the side remain through which the solder - may be material generated when brazing wholly or partly. 5, method according to claim 1 to 5, characterized in that the side of the belt (2) lying against the heat exchanger surface is marked with a Ri.-L "feluli -, - or dl. is provided or the strip (2) as a whole with ciacr scl-r. ", uchen 'Vallun from dä #I 1.-31 is guided; method for outer ribbing of' larine exchanger surfaces according to Anß uäi 1 to 5, thereby # , ekenn: Geichaet; v that the ribbed Pr 0 band, # - 2) tuiter one. in: Eän, - sricutua-i- deS band03 (".-1) we -ci C> kanden. Preload Icraft -Ll "on the * # s'i arms from t # aU2 - front surface (A is applied, Üie be so large in special cases. * -, - a = that the ultimate limit" -cO- : 3aiidziaterials is covered. Method according to claims 1 to 6, characterized in that under the band (2) which is pressed onto the heat exchanger surface with the prestressing force X, a foil of soldering material is placed on ## eWicLzelt Q is, which is also under a preliminary force when winding up. 8. Method for internal ribbing vorzu3s%, 7eise circular pipes according to claims 1 to 5, characterized in that the one or those connected to 'the band (2)', 2 'Jellbands (1) on a cylindrical assembly body (5, 5', 69 6t); is inserted, with the non-ribbed side of the band (2) facing the inside of the tube to be finned (3t) - and then, depending on the fastening -, - ung of the band - (2) or '.l.,' ell ban - des (1) vorzu-sriei - ends at one end of the pipe U to be covered, starting from the aforementioned four-way or after axially pulling out the z-, rliwdrischea mounting body (5, 5 ', 6, 61) on the V * iellbandsystem, seen from lUellband (1) w-id band (2), an axially -qic'UL-un- zo # otschreende torque is exerted that a Durdinesserver - enlargement of the now to Aiila, : ee'an over the inner side of the pipe koi, ituenden * ,. liell-oandc-ystems (1, 2) er-Ibt. L3 Method according to claims 1 to 5 and 8, characterized in 1, 1, denotes, -un, jehcn "from the fastening, --s -that through the free inside of the pipe - left CD place of the multi-strip (1) or tape (2 ) A rotating brush is placed in front of 2ohr (j) in the axial direction, ou # -c -! - e # .iiit i LD Sezo, 3en, which exerts a torque which causes the diameter of the corrugated band system. 10. The method according to Aas claim 1 to 5, 8 and 9, characterized - - characterized in that during.der Wirkund the D # irchmeszerver size-W r = t,:, causing torque M the multi-belt system (1, 2) respectively. the in the zT to berippende robur (_i1) preferably in your Bereichv the belt (2), -R plant is to be placed on the inner surface of the tube (3t) for example, is displaced by Bekiopfen in vibration. 11. WHILE SUPPLIES LAST-b-ren by claim 1 to 10, characterized in that the ait the one tape (2) to be connected - with abwech, .- e-Ilband (114) -selns-; short and long 2ellbandrippen is provided 12. a method according to Lnspruch 1 to 11.. , thereby -ei #: en-n indicates that two or more superimposed 0 ', Iie llbands -equal *, cell length, but with w-ith different heights are connected to the band (2). 1-2. Ver.Cahren according to claim 1 to 12, characterized in that Z> that with the band (2) zi., Tei or several neeenende-liejende where vorzu - # - # gvit> J-ie neighboring ### ', 311bhn, who are connected #a seen 3eSend in front of each other, VellbUmder in, 3trömungsrichtwis 5 at # ", are grounded.