EP0086268A1 - Apparatus in which heat is transmitted through hollow fibres - Google Patents

Abstract

1. An apparatus in which heat is transmitted from a first fluid to a second fluid through the walls of hollow filaments, in which the hollow filaments open into distributing or collecting pipes which have connecting parts for the supply or discharge of the fluid and to which the end sections of the hollow filaments are connected in a fluid-tight manner outwards by means of a packing composition, in which the hollow filaments are held by a support frame which is at least partially formed by the distributing and collecting pipes, in which at least a part of the hollow filaments is at least curved or bent once continuously or discontinuously, in which the hollow filaments are arranged in at most two layers, in which two-layer arrangement of the hollow filaments the hollow filaments of the first layer cross the hollow filaments of the second layer and contact the crossing hollow filaments at the crossing points, in which the hollow filaments of each layer are supported by support rods which cross the hollow filaments and are firmly connected to the support frame and the hollow filaments at the contact points thereof, in which the hollow filaments of each layer are arranged at a spacing from each other, in which the maximum excursion of each curved or bent hollow filament is from a twentieth to a fifth of the distance between the two ends thereof, and in which the hollow filaments do not lie in a plane but in a spatially curved or arched surface, characterised in that the end sections of the hollow filaments (7) are arranged in sealing ridges (1, 2) and are connected thereto in a fluid-tight manner outwards, which ridges have recesses-grooves (3, 4) adapted to the end sections of the hollow filaments (7), and that the sealing ridges (1, 2) are optionally partially admitted into the distributing or collecting pipes (8), but are in each case connected thereto in a fluid-tight manner outwards.

Description

The invention relates to a device in which heat is transferred from a first fluid to a second fluid through the wall of hollow filaments and in which the hollow filaments open into distributor or collecting pipes which may be designed as support frames and which have connections for the fluid supply or discharge and with which the end sections of the hollow filaments are connected to the outside in a liquid-tight manner by means of an investment material, and in which at least some of the hollow filaments are curved or bent at least once continuously or discontinuously.

This device is suitable, for example, for heat transfer between a gaseous medium, for example air, which flows around the hollow filaments and a liquid medium, for example water, which flows through the hollow filaments, in particular even at high wind speeds and ensures an essentially uniform, i.e. constant heat transfer performance.

The hollow filaments can for example be designed in the form of a circular arc, be angled once or several times, run in a zigzag shape or be shaped similarly, it being important that at least some of the hollow filaments, but preferably all the hollow filaments, do not run in a straight line, but in at least once continue in the changed direction.

The present invention represents an improvement of the invention according to the European patent (European Pat. Anm. 82 10 5358.4).

• "Stellt man sich die beiden Enden jedes der so gestalteten Hohlfäden der erfindungsgemäßen Vorrichtung durch eine gerade Strecke (Sehne) verbunden vor und bezeichnet man den größten Abstand des Hohlfadens von dieser Verbindungsgeraden (Sehne) als maximale Auslenkung, so werden besonders gute Ergebnisse erreicht, wenn die maximale Auslenkung der Hohlfäden der erfindungsgemäßen Vorrichtung ungefähr ein Zwanzigstel (1/20) bis ein Fünftel (1/5), insbesondere ungefähr ein Zehntel (1/10) der Entfernung der beiden Enden jedes Hohlfadens voneinander, also der Länge der Verbindungsgeraden (Sehne), beträgt."

In the description of the invention according to the aforementioned europ. Patent ... had been executed:

• "If you imagine the two ends of each of the hollow threads of the device according to the invention connected by a straight line (chord) and if the greatest distance of the hollow thread from this straight line (chord) is referred to as the maximum deflection, particularly good results are achieved if the maximum deflection of the hollow threads of the device according to the invention is approximately one twentieth (1/20) to one fifth (1/5), in particular approximately one tenth (1/10) of the distance between the two ends of each hollow thread, i.e. the length of the connecting straight line (tendon ). "

"The number of hollow threads of the thread sheet forming the heat transfer surface of the device according to the invention can be chosen arbitrarily, the hollow threads of each thread sheet not necessarily having the same or a similar shape must have, but generally have the same or similar shape. "

_" Particularly good results are achieved if the hollow fiber sheet is not in one plane, but in a spatially curved surface, for example the shape of the surface of a spherical cap, part of a cylinder jacket, a roof, a dome, a folding wall, a truncated pyramid and like that. "

"In an embodiment of the invention, the hollow threads can be arranged one above the other in several groups, each group expediently consisting of one or two layers of hollow threads. The hollow threads of a layer are expediently arranged at constant distances from one another, but can also spread out in a fan shape. The number of Hollow threads can also be different in the different layers, however the most expedient embodiment of such a hollow thread layer may be, the arrangement of the hollow threads of such a hollow thread layer is in any case such that the hollow threads could also be described in the broadest sense as being arranged next to one another. In the case of two hollow fiber layers per hollow fiber group, the hollow fibers of the first layer can cross the hollow threads of the second layer and touch them at the intersection points If several hollow thread groups are used, these are advantageously countered in a sufficient manner, which can be determined by simple experiments spaced from each other. "

"Advantageously, each hollow fiber layer or group has its own, possibly designed as a support frame, distributor and header pipes for the fluid supply or discharge, which in turn are connected to a common inflow or outflow line. Such hollow fiber layers or groups designed according to the invention, including their distributor and collecting tubes, can be designed in a particularly advantageous manner as module units which can be arranged one above the other or side by side in any number. For this purpose, it is particularly advantageous if the common inflow and outflow lines are formed by pipe sockets or connections which cooperate with one another in the manner of a plug connection and are arranged on the distributor or collecting pipes. These plug-in connections can be designed to be detachable and self-sealing or else so that after the module units have been joined together by welding, gluing or the like they cannot be detachably connected to one another in a fluid-tight manner to the outside. The stacked design of the device according to the invention formed in this way can have a square, rectangular, hexagonal, round or any other shape-shaped cross section or cover a base area of the same shape in plan view. "

"The hollow fiber layers or groups can be connected individually or in groups in series or in series, mixed forms are also possible, for example parallel connection of the hollow thread layers of each hollow thread group but series connection of the hollow thread groups."

"The hollow thread layers or groups arranged one above the other or next to one another can have a curvature in the same direction, but can also be curved alternately in opposite directions, for example in mirror image. Two hollow thread layers or groups curved in opposite directions, the ends of which in one In the case of an arrangement covering the entire surface, they can form approximately the shape of a pillow, a lens, a cylinder, a sphere, etc. "

"With the help of simple experiments, the practical design and arrangement of the hollow fiber layers or groups forming the device according to the invention, which can be readily determined, succeeds in keeping the wind noise generated when the hollow fibers flow around and thus in a low-noise, environmentally friendly device according to the invention."

"The shape of the hollow fiber layers or groups can be achieved by appropriate design of the distributor or collecting pipes and / or of support rods, which also give the hollow fiber coulters great dimensional stability. These support rods are expediently arranged such that they cross at least one of the hollow thread layers and are firmly connected at their points of contact with the hollow threads by welding, gluing and the like. The support rods advantageously have a larger diameter than the hollow threads and are arranged at greater distances from one another. At their ends, the support rods are advantageously connected to the distributor or The support rods can be preformed before they are installed or, for example, can be clamped in an arc with a corresponding excess length when installed between two distributor or collector pipes. "

"All hollow threads suitable for heat transfer can be used to produce the device according to the invention, these after a dry or wet spinning or an extrusion process. For the purposes of the present invention, the term hollow thread also includes so-called hollow fibers, thin tubes, thin-walled tubes, capillaries, tubes, plastic tubes and the like. Although the embodiments of the device according to the invention with non-metallic hollow threads are generally preferred, the teaching of the present invention can, however, also be readily applied to devices with correspondingly dimensioned metallic tubes. _"

The cross-sectional shape of the hollow filaments used can be of any type, the size of the cross-section of the hollow filaments as well as their wall thickness up and down being subject to no restrictions. The cross-sectional shape, the wall thickness and the size of the cross-section of the hollow filaments can also change along the length of the hollow filaments. Hollow filaments with a circular cross section can have, for example, an outer diameter of 800 μm up to 5 mm and above. The wall thickness of the hollow filaments can be, for example, 30 to 200 μm.

"For the manufacture of the device according to the invention, those hollow threads have proven to be particularly advantageous which have a heat transfer coefficient in the range from 15 to 200 W / m ² K and above, it also being possible to use hollow fibers which have improved thermal conductivity properties through the incorporation of metal , Graphite and the like in dust or powder form. Alternatively or additionally, the hollow filaments can also contain fillers, additives, stabilizers, carbon black, dyes and the like. The use of porous or microporous hollow filaments enables the application spectrum of the device according to the invention can be expanded in an advantageous manner. "

"For embedding the ends of the hollow fibers, customary adhesives, hardenable casting compounds, casting resins, special cements and the like can be used, whereby such investment materials can also be used that immediately after the first contact with the hollow threads slightly dissolve or melt them on the surface. The embedding of hollow threads or the end sections of which are known per se and therefore need not be explained here. _"

"The size of the device according to the invention is not subject to any restrictions within the usual dimensions."

"It has been shown, however, that if the hollow fibers are arranged too closely, the flow resistance for the fluid flowing around the hollow fibers increases considerably, so that the heat transfer performance drops considerably. Too large hollow fiber spacings in turn lead to unnecessarily large dimensions of the device according to the invention. For a particularly expedient design The device according to the invention is therefore proposed to choose the center distances of the hollow threads so that the distance between two adjacent hollow threads is 1.7 to 10 times their diameter, in particular 2.5 to 3.3 times between two adjacent hollow threads should advantageously be 0.5 to 15 mm, in particular 1 to 10 mm. _"

"The dimensions for the distributor or collector pipes depend on the one hand on the number of hollow threads emanating from or emptying into them and their dimensions, on the other hand on the total through the hollow threads flowing amount of fluid, because it is undesirable that unnecessarily high pressure drops occur in the manifold and manifolds. Furthermore, the dimensioning of the distributing and collecting pipes depends on whether they are also intended to serve as a support frame and should give the device according to the invention a stability which meets the requirements, or whether this should be brought about by other structural measures and devices. Depending on the requirements placed on the distributor or header pipes, they can thus also be provided, for example, with stiffening ribs or the like running in their longitudinal direction. It is also possible to give the pipes mentioned a shape which is favorable in terms of flow technology, or to achieve the same result by appropriately encasing them. _"

In the context of the present invention, it is finally also possible to let the hollow threads hang down as loose threads between the distributor and collecting pipes in loose loops, but here, too, in order to maintain constant hollow thread spacings, rods extending transversely to the hollow threads can be arranged, which can be connected to Hollow threads are firmly connected at the crossing points. "

'In addition to the hollow fiber groups formed from individual hollow fiber layers, suitable hollow fiber groups can also be formed by hollow fiber fabrics. It is also possible to use hollow fiber mats in which the spacing of the hollow threads from one another is determined by knitted threads, tapes or the like. "

The present invention is based on the object of improving the outward fluid-tight connections between the end sections of the hollow fibers and the distributor or collecting pipes on the one hand and the outward fluid-tight plug connections for joining together a plurality of device units which may be designed in module form in such a way that the desired sealing is achieved in a faster and simpler manner and with even greater reliability and even longer durability than is possible with the Europ. Patent ... proposed measures have already been achieved.

The improvement of the externally fluid-tight connections between the end sections of the hollow filaments and the distributor or collecting pipes is achieved in that the end sections of the hollow filaments are arranged according to the invention in sealing strips and are connected to these in a fluid-tight manner, which have recesses / recesses adapted to the end sections of the hollow filaments have, and that the sealing strips are optionally partially embedded in the manifold or manifolds, but in any case are firmly connected to the outside in a fluid-tight manner.

In an embodiment, each sealing strip can consist of two parts, whereby the insertion of the hollow thread end sections into the recesses / recesses is made considerably easier. The recesses / cutouts provided for receiving the hollow thread end sections are examples half arranged in the two parts of a sealing strip and half-shell-shaped.

With a sealing strip designed in this way, the assembly can be carried out, for example, as follows: First, one of the two parts of the sealing strip is placed with the recesses / recesses upward on a work table and the recesses / recesses are coated with a hardenable synthetic resin, an adhesive or the like. completely or partially filled out. The hollow thread end sections are then pressed individually into the filled recesses / recesses. Thereupon, the second part of the sealing strip with its downward-facing recesses / recesses is placed in an analogous manner after the half-shell-shaped recesses / recesses have also been completely or partially filled with the adhesive sealing compound. The fluid-tight connection of the two parts of the sealing strip to the outside can be done by welding, gluing or the like. Finally, the sealing strips with the hollow thread end sections embedded therein are inserted into the distributor or header pipes, which are provided with appropriately dimensioned longitudinal slots for this purpose, and are connected to the outside in a fluid-tight manner, which can be achieved by welding, gluing or the like. can be done.

The two parts of the sealing strips can furthermore be provided with interacting tongue and groove or snap-in devices or be shaped in such a way that their assembly is thereby facilitated and the position of the two parts to each other is clearly specified. For example, the two parts may have an L-shaped cross section and be dimensioned such that they form an essentially rectangular cross section in the assembled state.

If the hollow threads and the sealing strips are made of the same material, an externally fluid-tight connection between the two can also be achieved, for example, by ultrasound or mirror welding.

In the case of roll-up hollow fiber mats, the sealing strips advantageously consist of a rubber-elastic material, since in this case, in order to enable the hollow thread mats to be rolled up, the distributor or collecting pipes advantageously also consist of such a material. In a further particularly preferred embodiment, these parts can be integrated in such a way that they essentially form a coherent unit.

The improvement of the fluid-tight plug connections to the outside, the purpose of which has already been described above, is achieved according to the invention by connecting parts inserted into the connecting pieces, which are provided with at least two annular grooves arranged on their circumference for receiving O-rings or other seals. These connection parts, if they are intended to ensure fluid flow, can be tubular, if they are intended to effect a blinding, on the other hand, can be in solid form.

• Fig. 1 bis 5 eine erfindungsgemäße aus zwei Teilen mit L-förmigem Querschnitt bestehende Dichtleiste in verschiedenen Ansichten bzw. Darstellungsweisen,
• Fig. 6 die Dichtleiste nach den Fig. 1 bis 5 im eingebauten Zustand,
• Fig. 7 eine erfindungsgemäße aus zwei Teilen mit im wesentlichen rechteckigem Querschnitt bestehende Dichtleiste,
• Fig. 8 eine erfindungsgemäße aus zwei Teilen bestehende Dichtleiste mit einem im wesentlichen runden Querschnitt,
• Fig. 9 eine erfindungsgemäße Dichtleiste für aufrollbare Hohlfadenmatten,
• Fig.lO ein erfindungsgemäßen Verbindungsteil in massiver Form,
• Fig.ll ein erfindungsgemäßes Verbindungsteil in Rohrform,
• Fig.12 ein Verbindungsteil nach Fig. 11 im eingebauten Zustand,
• Fig.13 eine nut- und federähnliche Einrasteinrichtung.

The invention is explained below with reference to the drawing. Show it:

• 1 to 5, a sealing strip according to the invention consisting of two parts with an L-shaped cross section in different views or representations,
• 6 the sealing strip according to FIGS. 1 to 5 in the installed state,
• 7 is a sealing strip according to the invention consisting of two parts with an essentially rectangular cross section,
• 8 a sealing strip according to the invention consisting of two parts with an essentially round cross section,
• 9 shows a sealing strip according to the invention for roll-up hollow fiber mats,
• Fig.lO a connector part according to the invention in solid form,
• Fig.ll a connecting part according to the invention in tubular form,
• 12 shows a connecting part according to FIG. 11 in the installed state,
• Fig. 13 a tongue and groove-like locking device.

Fig. 1 shows the L-shaped cross section of the two parts 1 and 2 of the sealing strip according to the invention, Fig. 2 one Cross-section of the sealing strip after joining the two L-shaped parts 1 and 2 according to FIG. 1, FIG. 3 in a perspective view and cut along line III-III in FIG. 2, the sealing strip according to FIG. 2 with hollow threads 7 arranged therein (hollow threads also cut) 4 shows another perspective view of the sealing strip according to FIG. 3 with hollow threads arranged therein, and FIG. 5 shows the two L-shaped parts 1 and 2 according to FIG. 1 in a perspective representation, likewise in the non-assembled state.

In all figures, parts with the same item number also have the same meaning. These parts are therefore not described or mentioned again in every description of the figures. No position numbers are included in FIG. 4, since the meaning of the individual parts is unambiguous according to what has been predicted.

As can be seen from FIGS. 1 to 5, the two-part embodiment of the sealing strip according to the invention shown here consists of two identical parts 1 and 2, which have an essentially L-shaped cross section. In the assembled state (FIG. 2 and FIG. 4), the two parts 1 and 2 are only rotated to one another by 180 ° about their longitudinal axis and are joined together in such a way that the finished sealing strip has an essentially rectangular cross section.

The two parts 1 and 2 of the sealing strip according to the invention are with several in one plane at regular intervals Recesses / recesses 3 and 4 lying parallel to one another for receiving the hollow threads 7 are provided. These recesses / recesses 3 and 4 have a semicircular cross-section in their common coverage area, so that the recesses / recesses 3 of part 1 with the recesses / recesses 4 of part 2 in the assembled state in the central region of the sealing strip recesses / recesses 3; 4 with a round cross section, as shown in FIG. 3. In its second leg, the recesses / recesses have a cross section which is reminiscent of the shape of the free passage of a reduced arch, as is shown in part 1 of FIG. 5 and can also be clearly seen in FIG. Furthermore, the two parts 1 and 2 of the sealing strip according to the invention each have a longitudinal groove 5 or 6, through which an exact fixing of the sealing strip in the tube 8 receiving the sealing strip is achieved, as is shown in FIG. 6. FIG. 6 shows in cross section a sealing strip according to the invention, according to FIGS. 1 to 5, installed in a tube 8 in a fluid-tight manner and firmly connected to it, with the hollow threads 7 arranged therein.

The assembly of the two parts 1 and 2 of the sealing strip according to the invention with the hollow threads 7 inserted therein takes place in the same way as already described above, so that in the assembled state there is an arrangement as simplified in FIGS. 3 and 4 is shown. The length of the invention Sealing strip can be of any type and can be provided with a correspondingly large number of appropriately dimensioned and shaped recesses / cutouts for accommodating 50, 100 and more hollow fibers.

In the two-part embodiment of the sealing strip according to the invention shown in cross section in FIG. 7, both parts 1 and 2 have a substantially rectangular cross section and the sealing strip formed by joining the two parts 1 and 2 also has a substantially rectangular cross section. The remaining parts of the sealing strip correspond to their position numbers according to the parts as described in Figures 1 to 5.

In FIG. 8, a section of an embodiment of a two-part sealing strip according to the invention is shown in a sectional perspective representation, which has an essentially round cross section. Accordingly, the two parts 1 and 2 forming the sealing strip have an essentially semicircular cross section and, like the previously described embodiments, are provided with recesses / cutouts 3 and 4 for receiving hollow fibers and with longitudinal grooves 5 and 6.

FIG. 9 shows a preferred embodiment of a sealing strip according to the invention for roll-up hollow fiber mats in a perspective representation. For this purpose, parts 1, 2 and 8 are made of a rubber-elastic material. The dashed lines ver vividly the appearance or the arrangement of parts 1, 2 and 8 before assembly. As can be seen, the two parts 1 and 2 of the sealing strip are already connected to the part 8a forming the distributor or collecting pipe 8 in the assembled state before they are joined together. The hollow threads 7 are in this case in the opened state of the parts 1, 2 and 8a inserted into the recesses / recesses 4 of the part 2 after these have previously been applied with a sealing compound. Subsequently, the part 1 with the recesses / recesses 3 with the part 8a shown in broken lines is folded over the part 2, resulting in the arrangement shown in solid lines. According to the invention, parts 1, 2 and 8 can also be made in one piece in such an embodiment.

Furthermore, it is possible to achieve such an arrangement of sealing strip and tube 8, even if these parts are not made of a rubber-elastic material. For this purpose, as already described above for other embodiments, the rigid tube 8 is provided with a correspondingly dimensioned longitudinal slot into which the sealing strip formed from parts 1 and 2 with the hollow threads 7 arranged therein is inserted.

FIG. 10 shows, in a partially longitudinally sectioned representation, a connecting part 9 in solid construction, which serves to blind a flow cross-section. The Ver Binding part 9 is provided in its two end regions with annular grooves 10 which serve to accommodate seals, for example O-ring seals.

11 shows, in a partially longitudinally sectioned representation, a tubular connecting part 11 with which two pipe ends or pipe sockets can be connected to one another in a fluid-tight manner and which ensures a free flow of fluid. This tubular connecting part 11 is also provided in its two end regions with annular grooves 10 for receiving seals. Such an O-ring seal 12 arranged in an annular groove 10 is also shown in FIG.

FIG. 12 shows, in a partially longitudinally sectioned representation, an inventive connecting part according to FIG. 11 in the installed state. The two pipe ends or pipe sockets 13 and 14 are connected to one another by the connecting part 11, the two seals 12 preventing the fluid flowing through the pipes 13 and 14 from escaping to the outside. To fix the connecting part 11 in the tubes 13 and 14, these are each provided with a stop 15 against which the connecting part 11 rests with its end face.

Although both parts 1 and 2 have the same cross-sectional shape in the embodiments of a two-part sealing strip according to the invention shown by way of example in the figures, these parts can also differ according to the invention Liche cross-sectional shapes, and the sealing strip can also have an asymmetrical cross-sectional shape. With the same cross-sectional shapes for parts 1 and 2, however, there is the great advantage that the sealing strip is assembled from two identical parts.

The embodiment shown in Figures 10 to 12 represents a significant improvement in the connector, as in the above-mentioned europ. Patent ... shown for example in Figures 2 and 3 and described in the accompanying description.

FIG. 13 shows a tongue and groove-like latching device 16; 17, which facilitates the assembly of parts 1 and 2 to form the sealing strip according to the invention, since it clearly defines the correct position of the two parts 1 and 2 relative to one another. The latching device consists of one or more recesses 16, into which the elevations 17 are brought into engagement when they are joined together. Each of the two parts 1 and 2 has a corresponding number of such recesses 16 and elevations 17 at the appropriate place and in such an arrangement that the elevations 17 can only be snapped into the recesses 16 if the two parts 1 and 2 are positioned correctly. The snap-in devices 16 and 17 can be arranged at the end of parts 1 and 2 and / or at any point, but in the mandatory assignment, between the recesses / recesses 3 and 4, not shown in FIG. In Figure 3 shows such a device, which is arranged at the front right corner. The snap-in devices 16 and 17 can have a round, polygonal, elongated or any other, for example also L-shaped, cross section in plan view. The dimensioning of the depth of the depressions 16 and the height of the elevations 17 is at the discretion of the person skilled in the art. If the depth of the depressions 16 is chosen to be greater than the height of the elevations 17, the parts 1 and 2 lie close to one another. If, on the other hand, the height of the elevations 17 is greater than the depth of the depressions 16, a gap is formed between the parts 1 and 2, which can be filled, for example, with a flowable, curable casting compound.

Claims (11)

1. A device in which heat is transferred from a first fluid to a second fluid through the wall of hollow threads and in which the hollow threads open into distributor or collecting pipes which may be designed as support frames and which have connections for the fluid supply and discharge, and with which the end sections of the hollow filaments are connected to the outside in a liquid-tight manner by means of an investment material, and in which at least some of the hollow filaments are at least once continuously or discontinuously curved or bent, characterized in that the end sections of the hollow filaments (7) are arranged in sealing strips and with these are fluid-tightly connected to the outside, which have recesses / recesses (3; 4) adapted to the end sections of the hollow filaments (7), and that the sealing strips are optionally partially embedded in the distributor or collecting pipes (8), but in any case with these are connected fluid-tight to the outside. 2. Device according to claim 1, characterized in that the sealing strips consist of two parts (1 and 2). 3. Apparatus according to claim 2, characterized in that the two parts (1 and 2) of the sealing strips have the same cross-sectional shape. 4. The device according to claim 3, characterized in that the two parts (1 and 2) of the sealing strips have a substantially L-shaped cross section. 5. Device according to claims 2 to 4, characterized in that the two parts (1 and 2) of the sealing strips have cooperating tongue and groove or snap-in devices (16; 17). 6. Device according to claims 1 to 5, characterized in that the sealing strips have a substantially rectangular cross section. 7. Device according to claims 1 to 5, characterized in that the sealing strips have a substantially round cross section. 8. Device according to claims 1 to 7, characterized in that the sealing strips consist of a rubber-elastic material. 9. The device according to claim 8, characterized in that the sealing strips are integrated into a unit with the distributor or collecting pipes (8) consisting of a rubber-elastic material. 10. A device in which heat is transferred from a first fluid to a second fluid through the wall of hollow fibers and in which the hollow fibers open into distributor or collecting tubes which may be designed as support frames and which have connections for the fluid supply or discharge and with which the end sections of the hollow filaments are connected to the outside in a liquid-tight manner by means of an investment material, in which at least some of the hollow filaments are at least once continuously or discontinuously curved or curved, in which the hollow filaments are arranged in several groups one above the other or next to one another, each hollow filament group consists of one or two hollow fiber layers, which may cross and touch each other and the hollow fiber groups are arranged at a distance from each other, in which each hollow fiber layer or group has its own distribution and collecting pipes for the fluid supply or discharge, i.e. e are in turn connected to a common inflow or outflow line, and in which the device units which are formed in this way, if appropriate in the form of modules, are joined together by plug connections which form the inflow or outflow line and are fluid-tight, characterized by the pipe connections forming the connections (13; 14) inserted connecting parts (9; 11) which are provided with at least two ring grooves (10) arranged on their circumference and seals (12) arranged therein. 11. The device according to claim 10, characterized in that the connecting part (11) is tubular.

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