DE2016991A1 - - Google Patents

Description

Double-walled, with helical ones Corrugated tube assembly and process

their manufacture

The invention relates in a broader sense to a tube with helically extending corrugations. That by twisting of a metallic pipe, and particularly relates to a pipe unit having a metallic one Tube of substantially uniform diameter as a core as well as with an outer, helical one Corrugated tube that twists around the core is »whereby the inner surfaces of the corrugations come under pressure against the core or engage in it, around the assembled core To maintain state »

Corrugated tubes of the type in which the invention relates are often used in heat exchangers, where a liquid or a flowing medium is duroh circulates around the channels delimited by the corrugations · Frequently, turbulence in the circulating medium is desirable viewed »This applies to the corrugated ducts as well as to any inner core, the part of the heat exchanger can be"

tO9815 / 1229

-2-

2 01

The main task of the invention is training based on a unit »which has a tubular core of im substantially uniform diameter and an outer, Tube provided with helical corrugations has that twisted around the core and with this by contact or »engagement of the inner surfaces on or» in the core below Pressure is connected *

It is further sought ^ that with a unit of this kind a metallic »tubular core with a wall thickness before- ™ is seen * which is not larger than that of the outer tube, so that when the corrugations are formed, their inner surfaces are placed under pressure against the core in order to partially prevent it reshaping »This reshaping results in a firm meshing between the core and the corrugated tube and also creates a rough inner surface of the Core wall, which helps to increase the turbulence of the liquid flowing through the core »also leads to an improved and more effective heat transfer »

Another object of the invention is to provide a unit of the aforesaid To create a genre in which an external, with ) Corrugated tube has end walls that correspond to the. Seal the pipe ends, and that has a connection piece at each end »around the circulation of a liquid to enable »

Further, a unit is desired, wherein arranged at a distance from the corrugated tube, a third tube iat _r at each end end walls with a connecting piece has, for flowing fluid through the third tube to the corrugated pipe around ·

1098-15 / 1229

OSiGHNAL WSPECTED

When twisting a pipe around a tubular core is centering the two tubes often - but not always one essential factor «In this respect, it is a further task of the invention, a method of twisting a pipe to propose a core after which both ends of the tube to be rotated relative to the core one end of the pipe at which the warping process begins, be centered in relation to the core »According to another. Modification should not center by means of any - alone mechanical device provided for this purpose, but the centering should be done solely by the action of the rotating device itself.,.

These goals are achieved by a. Unity with a tubular, metallic core of substantially uniform diameter and with an outer, helical shape having running corrugations or Y / indungen Tube, which is twisted around the core to form the corrugations, is provided, with the inner surfaces of the Y / ellUi ..- to apply pressure against the core in order to partially reshape or deform it and create a firm bond between the core and the corrugated tube as well as creating a rough inner surface on the core wall «) In the In the twisting process, the core and the tube are centered with respect to each other, either as a result of the action of the twisting device itself or through a centering sleeve at one or both ends of the core ». · '-.

The ends of the corrugated pipe are ^ tapped, and it become connections or connections for a fluid circulation provided · Hach a modified embodiment a third pipe is spaced around the corrugated pipe

109816/1229
^c ■ - ^ - BAD ORIGINAL

2016

this arranged, whose ends are closed ·, and that Has connections for a liquid circulation *

The drawings show exemplary embodiments of the subject matter of the invention as well as for the method according to the invention ·.

pig »1 shows" partly in section »partly in view a dop * - * pelwandige> with helical; running corrugations provided pipe unit according to the invention

Fig. 2 is a cross-section along the line 2-2 in Fig. 1

Fig. 3 shows, partly in section, partly in elevation, another Embodiment of the subject matter of the invention ·.

Fig. 4 shows a schematic representation of the side view a device for the production of the pipe unit

Fig. 5 shows in longitudinal section the core, the centering device at each end and the outer ear before twisting

Fig. 6 is a perspective view of a detail on a larger scale and shows an end of the outer tube, which is used as an introduction to the Ver

rotating device is prepared

FIG. 7 shows a representation similar to FIG. 5, with however, the outer tube is shown twisted and with its helical corrugations.

FIG. 8 shows a representation of the core similar to FIG. 5 and the outer tube before the twisting process a centering sleeve at only one end <>

ORIGINAL. INSPEGTED

- 5 -; 201SH j

Pig · 9 is yet another representation that shows the location of the core and the outer tube facing each other before twisting if no centering sleeve is used,

Figo 10 is a cross-sectional view in a larger scale, the one on the one tired of the core and the outer Centering sleeve attached to the pipe showed

In the preferred embodiment shown in FIGS the pipe unit U has a core 10 and a outer tube 11, both of which are thin-walled are usually made of the same material, ZoB »steel, Copper, aluminum or other alloys that can be twisted into the shape shown

The core 10 has an outer surface 12 and an inner surface or hole 13 · The finished object is in most chop the wall from the actual cylinder shape somewhat deformed to helical beads, elevations or projections 14 in the bore 13 and corresponding depressions or to form grooves 15 on the outer surface. to for this purpose, the wall thickness of the core 10 is preferably such that the wall can be deformed when the corrugations on the tube 11 by twisting, which will be described later will be formed »The degree of deformation of the core 10, can be controlled by appropriate choice of its wall thickness compared to the wall thickness of the tube 11, and it is considered as general rule that »the thinner the wall of the core 10, the greater its deformation will be, that is to say that the helical protrusions or elevations 14 be all the more pronounced on the inside of the core If desired, the deformation of the Essentially avoided core and its inner surface

1O.9816 / 122 9-- ~ ⁶ ~

ORiGiNAL INSPECTED

be kept flat or smooth by comparing the core the wall thickness of the drill 11 is designed to be relatively thick-walled ο

The tube 11 has cylindrical sections 16 and 17 at opposite ends * which are at a distance from the core 10 · Between these sections 16, 17 there extend four helical corrugations 18, 19, 20 and 21, each of which runs the entire length between the Sections 16, 17 run through “This number of corrugations is purely exemplary, and another number can also be used to get voted·

Each corrugation has a rounded apex 22 from which sloping walls 23 and 24 diverge from each other are slightly arcuate · The lower end of the wall 23 of a corrugation goes into a bottom part or section 25 which is wide is bent * over and the other end of the corrugation goes into the lower end of an adjacent corrugation · The arcuate Absohnitte 25 fit into the depressions 15 shown in the core 10 and ultimately achieve a mechanical one Interlocking with this, reducing the location of the core to the pipe 11 is held in the assembled state * Es however, it should be noted that in most cases the fastening of the core to the pipe does not involve mechanical interlocking grip is dependent »except for the cases in which the tube 11 is made of resilient or receding material, which tends to relax after twisting · The inner surfaces of the corrugations are usually lying against the core under pressure caused by the twisting of the outer pipe was created * and this system or »this Engagement also keeps the tube and the core in the assembled state »The actual formation of the depressions 15 in the

109815/1229

Core is so far not in all cases, as mentioned above _t: not / Endig and when such recesses are not present ,, so, the engagement between the Y / ellungen and ^ are the core itself to the tube and the core in the assembled state to keep"

The tube unit U is widely used, in particular as part of heat exchangers, in which case the same or different liquids or media flow in mutual heat exchange through the core 1-0 and the channel 26 formed between this and your tube 11 26 is 26 'through the four helical corrugations divided along the corrugated portion in four separate passageways "as shown in Pig x 2 · the same or a ande ~ res medium may be on the outer surface of the tube 11 ia ^v heat exchange with the medium or Media in core 10 and channel 26 are guided *

3 shows a modified embodiment of the tube unit TJ ₉ shown in FIG. 1, in which the space between the two end sections 16 and 17 of the tube 11 is closed by end walls 27 and with laterally extending connecting pieces 28 and 29 on the opposing sides End portions 16, 17 are attached to allow the passage of a liquid through the channel 26 between the ports 28, 29 Similar end walls and laterally extending connectors can, if desired, be attached to the opposite ends of the core 10, however, in FIG. 3 it is provided instead that the core 10 is equipped directly with axially extending connections or connecting pieces 53 In the arrangement according to FIG. 3, a pipe or jacket 30 is also attached around the pipe 11, the space between this and the pipe 11 by end walls 31

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from it Gil lag sen is μηφ sideways, first flowing out dungsistüQlce 3.2, ^ 3 _; 3 are connected to the jacket, and fluid is carried through the tree 55 ² Vt- which is formed between the pipe 11 and the pipe 30? Biflüpsigkeit flows between d0? I ifeii Mndungsstuken .. 32 | 33 over. the. Augstf ^ p ^ g ^ r flee fep H ^ hy-es 11 in the noise pause exchange with the / Jledium im

in fig «. 4 is a forrichtung is shown, with which the unit II Found e ^ can be tipt. " 3) a .diesp f appiGh | ung immediate, the subject matter of the invention is _s is the lung more qghematiseh

Bed 34 PiP ^ ßi ⁿ carriage 35 und.d a fe ^ tpr. Port 36 stored ^ Per slide 35 carries a Pßi ^ stpck 37 »in weleJigm iElmmtacken 38 are fixedj which are held against rotation» ^ ej Support 36 is ßin pin | ielst.o, ck 39 with clamping jaws 40 three bar mounted * Ber Support 36 contains among other things one of a (not shown) Kraftq. ^u Pi-i-ß driven gear, which in turn rotates the Spindelstppk 3.Q- * A HyäpaU | ik cylinder 41 is attached to the bed 34, from which a piston rod 42 protrudes "this with the pchlit- ± ßXL 35 ygrbundfii is · per cylinder 41 nn $ £ lne piston rod 42 that each »d | sn. Slide in aa ^ ßlep Jli | 3htung to fc.ewejgen ^ rotated during the Spindelsiipck ^ 9

FROM fig. 6 it emerges that the contour of the cylindrical shape each des fiphres 11 immediately adjacent feil 43 has ^ Me ypr introduction of the. piphre ^ 1 | in. the direction to fig? 4 formed μτ each corrugation 18, iQ 20 and 21 i ^ t iß eiP-e Sf? Idrüi3fcu? Ig 43 provided When twisting the ear | 1

BATH ORIGINAL

In Fig. 5 it is shown how the core 10 is arranged inside the tube 11 before the twisting process, and it is in the Hohr 11 by two. Centering sleeves. O, of which one is at each end, centered * The core 10 sits loosely in each centering socket a core 10 and a tube 11 with Zentriermuffen C composed and Sndabschnitte of the tube 11 are introduced into the clamping jaws and 40 of the tailstock 37 bzwo headstock 39 "spell be the ¹ jaws tightened, and the headstock 39 is rotated - the To form corrugations 1.8, 19 »20 and 21» During this rotation, the tube 11 is shortened and the hydraulic cylinder 41 is preferably actuated in order to give the tailstock 37 a controlled movement so that it helps to achieve a uniform pitch and to maintain a uniform spacing of the corrugations. In some cases, however, the cylinder 41 and / or its function can be omitted, the movement of the tailstock 37 being obtained solely from the tensile force exerted on it by the tube and the core during rotation

Fig. 7 shows the condition of the auger tube 11 ₉ after it has been twisted. It can be seen from this how the durometer of the corrugated part of the tube 11 in the depressions of the corrugations has been reduced in comparison to Fig. 5.

At Fig »8 a, method and apparatus for preparing a unit is described in U, where only a single: centering sleeve" ö used · This sleeve is applied to that end at which the twisting: begins, which means for the presentation at the right-hand end at section 16 »(According to this procedure, the core 10 'step:

109815/1229

: .-. ','. BATH ORIGINAL

!, by the tube 11 against the portion 17 out with progress of the Verdrehvorg ^r angs centered * lter core 10 is initially movable in the axial direction of the tube 11 and the sleeve east; however, as soon as the twisting process begins »any such movement is prevented by the contact of the corrugations of the tube on the core» -

In the method of Mg "9 no centering sleeve is applied" at the beginning of the twisting operation of the core 10 rests in the lower ¹ part of the bore of the tube 11 ', when the twisting "begins, causes the formation of Wβllungen and their plant or its engagement with the core TO that this is centered and held against axial movement »

In the method according to FIGS. 5, 8 and 9 derrohrför- ^; mige core 10 initially loosely received in the tube 11 before the start of the twisting process “This means that it can be moved axially until the twisting begins, and one or more of the corrugations formed in the tube 11 are brought into a tightly engaged state with the core "Usually any slight axial displacement of the tubular core, which can occur before the beginning of the twisting process, is not harmful or disadvantageous. However, if it is desired, a device can be provided which holds the tubular core exactly opposite the tube 11 until the corrugations are formed in the tube 11 "to connect the tube to the core". Such a device is shown in Fig. 10. It has a centering sleeve D "which in place the socket 0 according to FIG. 8 or in place of one of the sockets 0 according to FIG. that is to say at the end of the tube 11 at which the helical

-11- 109815/1229

en ^ and Qtas therefore begin during the
ganga does not look much more like that, core 1 © moves the
muffe.B has an annular base part 44 made of metal with
a Muaaerea cylinder surface 45 and a hole 46 «
The lesion part 44 erodes itself into an axial lip position
on ss he uBd sleeve-like collar 47 and a longer one! inner-FlansGh 48,! the latter has an iohr-ungf $ %% §in§
the brace 46 is the old collar 47 and the one sleeve.
Flange 48 have a distance from each other and delimit went narrow Kehlet the gemau den ^ i ^ ndrisohen Esdabgphni ^ t \ §
the iiohres 11 receives · 33AS inner end of the flansehep, 4i leiqht Yerjtingt can be to its insertion into AEAP Söfei ¹ 11 m EIP »facilitated term" Bas tube 11 a Stellsehraube is at the gent ^ iernruffe B du ^ efe set 49 * 33s core 1Q turn eats into |? he added bore 46 and opposite the Zentriermuffg $ WQM a set screw attached 5Q '^ ie gtells "hrauben 4 | This prevents an axial movement of the nucleus
the pipe 11 and allow the exact holding of the R
adjustment of the ear and core to each other at 44§ ^s em,
End «Of course, the opposite4§ end | e§ core 10 _f d» h · the left-hand end in figt 10 | nipht gegg-a tiber be noted the Kohr _f slidably but it must
his »to the shortening of the l-ear j1 at the Terdrehforgapg
allow" .

22 259 -

Claims (11)

~ 12 - a tent ans ρ r ü c he { 1. Double wall, with helical 'divisions provided tube unit, characterized in that a thin-walled »metallic, tubular core (10) of an outer, thin-walled, metallic tube (11) is surrounded, which has a plurality of helically extending has corrugations (18, 19, 20, 21) extending over part of its length, the inner surfaces of which rest against the core or engage in it and the core and the outer tube in the assembled state keep" 2 »pipe unit according to claim 1, characterized in that the core (1O) has a substantially uniform Diameter has * 3 »Pipe unit according to claim 1, characterized in that that the outer tube (11) is provided with smooth-walled end sections (16, 17) which are at a distance from the core (10) have 4 * pipe unit according to claim 1, characterized in that the corrugations (18, 19, 2Q, 21) on the core (10) on its outer surface (12) running helically Depressions (15) »in which the inner surfaces of the corrugations are received» and in the bore (13) of the core (10) protruding, helically extending elevations are formed » 5 »pipe unit according to claim 1, characterized in that the space between the outer tube (11) and the core (10) on each Closed ends and a connector at each end 109815/1229 BATH -j ■ * _ (28, 29) is provided over which in the space between Fluid circulating around the outer tube and core can be fed in and drained off * 6 * raw unit according to claim 5> characterized in that a third tube (30) is arranged around the outer tube (11) the space (55) between this and the tube (11) is closed at each end and at each end. Connection piece (32, 33) for supply and discharge of im Channel (55) is arranged between the pipe (11) and the third pipe (30) circulating liquid ».. 7 · Pipe unit according to claim 1, characterized! that the core, (ίο) and the outer tube (11) are mechanically connected to each other _»t. . . 8. Pipe unit according to claim!, Characterized in that,. because the core (10) and the lungs (18, 19, 20, 21) in the outer tube (.11) a plurality of helical running channels (26 *), with which to - and ' Outlets (28, 29) for a. Circulating liquid or »a circulating medium are connected» 9. Double-walled tube unit provided with helically extending corrugations, characterized by a thin-walled, metallic core (10) and an outer, thin-walled, metallic tube (11) with a plurality of corrugations (18, 18) extending over part of its length. 19 »20,21), which form a plurality of helically running channels (26 * ) between the core (10) and the outer tube (11), to which connecting pieces (28, 29) for the supply and discharge of in the channels circulating fluid are aloof »· 109815/1229 BATH - 14 - 2616991 10 · Pipe unit according to claim 9 »characterized in that, ..- that at the end of the tube with the channels (26 *) in Connection connecting piece (28, 29) is provided and the space between the core (TO) and the outer Pipe (IT) at "both pipe ends, closed, is» 11. Pipe unit according to claim 9, characterized in that a third pipe (30) is arranged around the outer pipe (11) and connecting pieces (32, 33) for the supply and discharge of in the space (55) between the pipe ( 30) and the pipe (11) circulating liquid are provided » 12ο Process for the production of a double-walled, with helical corrugations provided tube unit, characterized by the formation of a plurality of spaced apart on a circumferential circle of a thin-walled, metallic tube (11) lying indentations (43) in an area that has a Distance from one pipe end, all indentations (43) being substantially the same distance from the pipe end have, by inserting a thin-walled, metallic, tubular core (10) into the outer tube (11) and by then twisting the outer tube. (11) by applying a twisting force at two points along its length, between which the indentations (43) are located so that helical corrugations (18, 19 »20, 21) are formed on the indentations (43) and have inwardly extending sections (25) which are against the tubular Place the core (10) and connect it to the outer tube (11) hold together » 13 · The method according to claim 12, characterized in »that . the tubular core (11) has such a wall thickness against . λ f., 109-815 / 1229; - - ¹⁵ ~ '' over the wall thickness of the outer tube ("H), that the part of the helical corrugations, which rests against the tubular core »deforms it and 'helically' running., '"into the interior of the core extending elevations as well as helical, outer depressions, in which sections '(25) of the! Divisions (18, 19 »20, 21) are recorded. forms are. * ' 14 »The method according to claim 12, characterized in that after the twisting process has ended, further parts (27, 28, 29) are connected to the outer tube (11) and the tubular core (10), which the space between the outer tube (i1 ) and core (10) sealing at both ends of the tube (11) and a ^{Plüssigkeitszu-:} and discharge form for this space · 15 «The method according to claim 12, characterized in that the core (10) opposite; the outer tube (11) on his both ends are mechanically centered before and during the twisting process j, _ "i 16 «Method according to claim 12, characterized in that the core (10) opposite the outer tube (11) before and at least during the initial phase of the twisting process ^; - - ^: is mechanically centered only at the end that is provided with indentations (43). The end of this outer "tube (11) is assigned, and that the remaining part of the core (10) during the twisting process through the abutment of the" helical ν extending corrugations (18, 19, 20, 2 1 ) on the core. (OK) is centered * 17 »The method according to claim 12, characterized in that 10 9815/1229 -1 ^ - 2O16'991 inserting the tubular core (10) into the exterior Tube (11) is carried out in such a way that the core (1Ö) is radially to the tube (11) before the twisting process all points of its length. "can move ^; and: that at Twisting the tube (11), the core (10) .Alone by its Attachment to the corrugations formed during rotation in the Tube (11) is centered opposite this o 18p method according to claim 12, characterized in that the end of the tube (11) having the indentations (43) opposite the associated end of the core (10) axially determined by twisting * 259 - 1098 16/1229