Method and apparatus for manufacturing a helical coil

Abstract

In a method for producing a spiral coil (2), in particular for a spiral screen, a filament (4) is transported in the filament transport direction through a first channel section (8) of a first rotating body (7) and subsequently transported through a second channel section (9) of a second rotating body (10) rotating synchronously with the first rotating body (7). The filament (4) is then wound around a protruding winding core (13), so that a spiral coil (2) is produced from the filament (4) by continuous feeding of the turns of the filament (4) wound around the winding core (13). According to the invention, a heated heating fluid (15) flows with overpressure through the first channel section (8) and a second channel section (9) arranged immediately following the first channel section, and heats the filament (4) transported through the first channel section (8) and then transported through the second channel section (9). The filament (4) coming out of the second channel section (9) is deformed by a deformation device (12) before being wound onto the winding core (13).

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a spiral coil, in particular for a spiral screen, wherein a filament is transported along a filament transport direction through a first channel section of a first rotating body, wherein the first rotating body rotates around a first section of a core element supported in a rotationally fixed manner, wherein the filament is subsequently transported along the filament transport direction through a second channel section of a second rotating body, wherein the second rotating body rotates synchronously with the first rotating body around a second section of the core element following the first section, and wherein the filament is subsequently wound around a winding core extending from the core element after the second section in the filament transport direction, thereby making it possible to manufacture a spiral coil with the filament by continuously feeding the turns of the filament wound around the winding core. Background Art

[0002] For example, a spiral screen can be manufactured from a plurality of spiral coils arranged side by side and connected to each other, which is used in practice as a cover or drying net in a paper machine. A planar composite structure consisting of a plurality of spiral coils is also suitable as a conveyor belt or a filter device. The individual spiral coils can be made of metal. For many fields of application, spiral coils made of plastic have advantageous properties. Spiral coils are usually manufactured based on wires (Draht) or filaments (Filament), which are transported from a storage drum through a spiral device with a rotating guide element for the filament and then wound around a winding core. Each new turn of the filament wound onto the winding core from the rotating guide element squeezes the previously wound turns and moves the resulting spiral coil away from the winding core.

[0003] Different variants of such methods and of devices for carrying out these methods are described, for example, in DE 1 140 698, CH 421 484 or DE 1 956 321.

[0004] When producing helical coils from plastic wire or plastic filaments, it is advantageous if the filaments are heated when being wound onto a winding core, so that the wound filaments retain the shape predetermined by the winding as long as possible even after being separated from the winding core. DE 2010 268 describes a device in which the winding core is heated and thereby a temporary heating of the filaments wound onto the winding core can be achieved, which is also referred to as thermosetting in this document. Devices are also known from practice in which the filaments are heated shortly after being unwound from a supply drum and are transported in a heated state through one or more channel sections in order to be subsequently wound onto a winding core.

[0005] For many fields of application of spiral coils, it is advantageous that the spirally wound filaments do not have a circular cross section, but an elliptical or nearly rectangular cross section. Since the filaments usually used to produce spiral coils initially have a circular cross section, it is necessary to deform the filaments after unwinding from the supply drum and before winding onto the winding core. This can be accomplished, for example, by guiding the filaments through between rotatably supported rollers, wherein the spacing of the rollers is smaller than the initial diameter of the filaments and the filaments are thereby deformed to have a flattened cross section. DE 20 2008 005 836 U1 describes the deformation of the filaments immediately before entering the first channel section.

[0006] In such a deformation of the cross section of the filament, it is also advantageous if the filament is heated during the deformation. It is known from practice that the filament is heated after being unwound from the supply drum and is also deformed directly thereafter. However, it has also been shown that a cross section of the filament which is no longer rotationally symmetrical after the deformation is disadvantageous for subsequent transport through rotating components until it is wound onto a winding core, since the flat filament can tilt outside or also inside the channel section during rotation or curl in the guide element. Summary of the invention

[0007] It is therefore considered to be an object of the present invention to design the method described in the introduction in such a way that a helical coil can be produced from a filament as quickly and reliably as possible.

[0008] According to the invention, this object is achieved in that the heated heating fluid flows with overpressure through the first channel section and the second channel section arranged immediately thereafter and heats the filaments transported through the first channel section and immediately through the second channel section. The heating of the filaments is therefore not limited to the transport section before or after the rotating channel section, but is carried out during the transport of the filaments through the rotating channel section. This allows for much more effective and gentler heating of the filaments and at the same time a higher heating of the filaments when they are wound onto the winding core.

[0009] Filaments are known from the prior art and include all linear, flexible structures that have a very small cross-section compared to their length. In addition, filaments can be single filaments or wires made of plastic, which are designed as single strands and can be produced, for example, from a single-hole nozzle using an extrusion melt spinning process. The diameter of the filaments can be between a few nanometers and a few millimeters, wherein larger diameters are also conceivable depending on the application and the material of the filaments. The filaments can be composed of different materials or material combinations, wherein for many applications, plastics or metals may be suitable materials.

[0010] The heated heating fluid can be a suitable liquid or gas. It has also been shown that hot air that has been heated beforehand is suitable in an advantageous manner for conveying the filaments together with the filaments through the channel section and for heating the filaments in the process. In the case of operation, which is usually of longer duration, the channel section and the surrounding wall areas are also heated by the heated heating fluid, thereby additionally supporting the desired heating of the filaments.

[0011] According to a particularly advantageous embodiment of the inventive concept, the filament emerging from the second channel section is deformed by a deformation device before being wound onto the winding core. The deformation is therefore not carried out before or during the transport of the filament through the channel section of the rotating rotary body, but only afterwards. The deformation of the filament to the cross section provided for the helical coil is carried out after a longer heating period of the filament and immediately before being wound onto the winding core. It is not necessary to double heat the filament, which is sometimes known from practice, in order to first deform the cross section of the filament before the filament is transported through the channel section and then to support the winding onto the winding core again.

[0012] With regard to the most trouble-free and rapid winding of the filament onto the winding core, it is advantageous according to one embodiment of the inventive concept to feed the filament with a rotationally symmetrical cross section to the first channel section and to deform the filament in the deformation device to have a rotationally asymmetrical cross section.

[0013] In order to transport the heated heating fluid into or through the channel section, it is optionally provided that the filament is transported before the first channel section through a rotationally fixed feed chamber and supplied to the first channel section, and the heated heating fluid is likewise supplied to the first channel section through the feed chamber. The rotationally fixed feed chamber can be used to establish a connection to an externally arranged storage container for the heating fluid in a simple manner. The heating fluid can be optionally temperature-controlled in a suitable manner or brought to a desired temperature and loaded with an overpressure in the feed chamber or outside the feed chamber in order to promote the desired heating of the filament in the channel section immediately after flowing through the channel section.

[0014] In order to advantageously make the heated heating fluid available for targeted use in deforming the cross section of the filament even after flowing through both channel sections, it is optionally provided that the heated heating fluid flows through the deformation device after exiting the second channel section.

[0015] In order to help the heated filament to maintain its deformation imposed by winding onto the winding core during transport through the channel section and thus stabilize the shape of the helical coil, according to one embodiment of the invention, the heated heating fluid flowing out of the second channel section is directed onto the winding core. The winding core is thus additionally heated in an advantageous manner.

[0016] The present invention also relates to a device for manufacturing a spiral coil, in particular for a spiral screen, comprising: a core element supported in a torsionally fixed manner; a first rotating body, which is supported in a manner that rotates around a first section of the core element extending along the core element in the direction of filament transport; a second rotating body, which is supported in a manner that rotates around a second section of the core element extending along the direction of filament transport and following the first section; and a winding core extending from the core element behind the second section in the direction of filament transport, wherein the filament is guided through a first channel section in the rotating first rotating body in the direction of filament transport and subsequently guided through a second channel section in the synchronously rotating second rotating body, and is subsequently wound around the winding core, whereby a spiral coil can be manufactured with the filament by continuous feeding of the turns of the filament wound around the winding core.

[0017] Devices known from the prior art are described, for example, in DE 10 2010 056 254 A1. By arranging the two rotating bodies described in DE 20 2008 005 836 U1 on a common core element, in which case the axes of rotation of the two rotating bodies are laterally offset from one another, it is possible to achieve that the filament can be transported through the rotating channel section and wound onto a stationary winding core that projects beyond the rotating channel section, and the wound turns can then be detached or moved away from the winding core without further deformation of the turns.

[0018] The premature deformation of the filament before entering the first channel section is considered disadvantageous. Heating the filament to support the winding onto the winding core can only be accomplished by a heating device arranged in advance in the transport direction.

[0019] It is therefore considered to be a further object of the present invention to further develop such a device for producing a helical coil in such a way that the filament can be advantageously heated before it is wound onto the winding core.

[0020] According to the invention, this object is achieved by arranging a feed chamber supported in a rotationally fixed manner before the first rotating body in the direction of filament transport, through which the filaments conveyed from the stock can be introduced into the first channel section, wherein the feed chamber is connected to the heating fluid stock, so that the heated heating fluid can be conveyed to the feed chamber with overpressure and then flow through the first channel section and the second channel section arranged immediately thereafter. The feed chamber is arranged in a rotationally fixed manner and can be connected to the heating fluid stock in a simple manner via a connecting line. The heating of the heating fluid can be carried out either in the feed chamber, but preferably outside the feed chamber, so that the heating fluid flowing into the feed chamber is already heated. The feed chamber can have an annular outlet gap, which is arranged and constructed in such a way that the input end of the first channel section of the first rotating body moves along the annular outlet gap during operation and the heating fluid loaded with overpressure is continuously pressed into the first channel section. In order to design the device as space-saving as possible and with low weight, it is advantageous to use external components outside the feed chamber to perform heating and pressure loading of the heating fluid.

[0021] According to a particularly advantageous design scheme of the inventive concept, a deformation device is arranged at the second rotating body immediately adjacent to the output end of the second channel section in the direction of filament transport, with which the heated filament coming out of the output end of the second channel section can be deformed before being wound onto the winding core. The deformation of the filament is thus completed before the deformed filament is about to be wound onto the winding core. The filament can first be delivered to the first channel section in a rotationally symmetrical shape or with a circular cross section and transported through the rotating first and second channel sections, thereby avoiding the filament from tilting during the rotational movement or the possibility of curling during the transportation through the channel sections. In this way, a significantly higher rotational speed for the rotational movement of the filament can be achieved and a correspondingly higher manufacturing speed of the spiral coil can be achieved.

[0022] Furthermore, due to the arrangement of the deformation device immediately following the outlet of the second channel section, the filament can be heated immediately before deformation by the deformation device by transporting the filament through the entire transport length of the first and second channel sections. This achieves particularly gentle and uniform heating of the filament, which in turn has a favorable influence on the production speed and mechanical stability of the helical coil produced in this way.

[0023] In order to make the heating power of the heating fluid flowing through the two channel sections also available to the deformation device, it is optionally provided that the deformation device has an inlet opening for the heated heating fluid facing the outlet of the second channel section, and the deformation device has an outlet opening for the heated heating fluid. In this way, the heated heating fluid can also flow through the deformation device and heat both the filament transported through the deformation device and the components surrounding the deformation device.

[0024] In order to enable the heated heating fluid to be used additionally for advantageous heating of the filaments during winding onto the core, one embodiment of the inventive concept provides that the outflow opening of the deformation device is directed toward the core. The heating fluid flowing out of the deformation device thus heats the core and the filaments wound onto the core. The heat energy transported with the heating fluid is thus used very effectively to heat a plurality of components of the device along the filament transport direction.

[0025] According to an advantageous design scheme of the inventive concept, the core element has a first axis in the first section, the first rotating body is supported in a manner rotating around the first axis, and the core element has a second axis in the second section, the second rotating body is supported in a manner rotating around the second axis, and the first axis is connected to the second axis by a connecting device so that the center axis of the first axis has a lateral offset relative to the center axis of the second axis. The two rotating bodies can be driven from the outside and rotated during the operation of the device. The built-in core element can be based on the staggered center axis of the two shafts (the rotating bodies provided are respectively supported in rotation on the two shafts) without rotating therewith. Thus, a torsion-proof or position-fixed arrangement of the core element can be achieved without the need for a rigid connection of the core element to the surrounding environment. The filament rotating around the core element can then be guided and transported along the core element around the core element in a particularly simple manner. The winding core can be fixed at a stationary core element and designed to protrude in the direction of filament transportation.

[0026] In order to reduce the undesired loss of thermal energy and heated heating fluid, according to one aspect of the present invention, the distance between the output end of the first channel section of the first rotating body and the input end of the second channel section of the second rotating body is less than 1 mm, preferably less than 0.5 mm and particularly preferably less than 0.2 mm. The two rotating bodies rotate around the rotation axes arranged laterally offset from each other, and the rotation axes correspond to the laterally offset center axes of the two shafts, and the two rotating bodies are supported at the two shafts. Rigid coupling or continuous connection along the circumference of the two rotating bodies is therefore not easy to achieve. By setting the gap width of the gap between the two rotating bodies to be as small as possible, it can be achieved that the heating fluid flowing through the first channel section is basically completely transferred to the second channel section immediately after the gap, or flows there, and the heating fluid is prevented from flowing out laterally through the gap formed between the two rotating bodies as much as possible. The input opening of the second channel section facing the first channel section can suitably have a larger diameter and the second channel section can then narrow to a predetermined channel diameter, so that the filament coming out of the first channel section can be incorporated into the adjacent second channel section solely by feeding the filament into the first channel section, without the need for separate support or forced guidance at the input end of the second channel section.

[0027] There is no need to drive the two rotating bodies independently of each other with a separately provided drive or drive component to produce a corresponding rotational movement. It has also been shown that, in particular at high rotational speeds, the required synchronous rotational movement of the two rotating bodies is associated with a high control effort and the corresponding drive must be designed to be extremely precise and expensive to control. Therefore, according to an advantageous design of the inventive concept, it is provided that the first rotating body of the rotational support and the second rotating body of the rotational support are coupled to each other contactlessly by means of a magnetic coupling. Exactly in combination with the smallest possible gap width between the first and second rotating bodies, a magnetic coupling can be achieved, which couples the rotating body that is not driven separately to the driven rotating body and the rotational movement of the driven rotating body can be transmitted to the non-driven rotating body. Thus, a drift of the rotational movements of the two rotating bodies away from each other is avoided in a simple manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Exemplary exemplary embodiments of the inventive concept are shown in the following text in different figures and are explained in more detail.

[0029] Figure 1 is a schematic diagram of an apparatus according to the present invention for manufacturing a spiral coil;

[0030] Figure 2 is a cross-sectional view of a feed chamber, through which both the filaments and the heating fluid are fed to a rotating body with a first channel section arranged immediately behind in the filament transport direction;

[0031] Figure 3 is a cross-sectional view of a deformation device, which is used to deform the filaments emerging from the second rotating body before the deformed filaments are wound onto the winding core;

[0032] Figure 4 The figure shows a schematic sectional view of an exemplary embodiment of the device according to the invention. DETAILED DESCRIPTION

[0033] exist Figures 1 to 4 1 shows a device 1 for producing a spiral coil 2 from a filament 4 which is fed to the device 1 from a supply drum 3. The filament 4 is fed to a first rotating body 7 via a feed chamber 6 which is fixed in a rotationally fixed manner to a base 5 or to the ground, in which a first channel section 8 is formed, through which the filament 4 is transported. The filament 4 is subsequently transported through a second channel section 9 which is formed in a second rotating body 10. The first rotating body 7 and the second rotating body 10 are arranged rotatably only in a rotational direction. Figure 1 The core element 11 is schematically shown in the figure, which itself is supported in a rotationally fixed manner in the two rotating bodies 7, 10.

[0034] A deformation device 12 is fixed to the end of the second rotating body 10 facing away from the first rotating body 7 , with which the cross section of the filament 4 transported through the deformation device 12 is deformed from an initially rotationally symmetrical or circular cross section into an elliptical or approximately rectangular cross section.

[0035] The deformed filament 4 is then wound from the rotating second rotating body onto a torsionally fixed winding core 13, which is fixed to the core element 11 and projects beyond the core element 11 in the filament transport direction indicated by the arrow 14. By winding new turns onto the winding core 13, the already wound turns are compressed and the spiral coil 2 produced in this way is moved further in the filament transport direction and away from the winding core 13.

[0036] A heated heating fluid 15 charged with overpressure is supplied from a heating fluid storage container (not shown) to the feed chamber 6. The heated heating fluid charged with overpressure flows from the feed chamber 6 into the first channel section 8 and then flows through the first channel section 8 and the second channel section 9 extending adjacent thereto into the deformation device 12. The heating fluid exiting through the outlet 16 is directed from the deformation device 12 toward the winding core 13 and, when flowing out of the deformation device 12, also heats the winding core 13 and the filament 4 wound thereon.

[0037] The heated heating fluid 15 heats the filament 4 starting from the feed chamber 6 during transport through the first channel section 8 and the second channel section 9 and during deformation in the deformation device 12 and when it is wound onto the winding core 13. This results in gentle and uniform heating of the filament 4, which has a favorable effect on the deformation of the filament 4 in the deformation device 12 and when it is wound onto the winding core 13, and leads to a stable and mechanically load-bearing shape of the spiral coil 2 produced in this way.

[0038] exist Figure 2 The feed chamber 6 shown enlarged in the figure has an inlet 17 for the filaments 4 delivered from the storage drum 3. A heating fluid 15 that has been heated beforehand and loaded with overpressure is delivered via a laterally arranged connecting line 18. For many fields of application and filament materials, hot air is a suitable heating fluid 15. On the side facing the first rotating body 7, the feed chamber 6 has a circular outlet 19. The first rotating body 7 is separated from the circular outlet 19 of the feed chamber 6 only by a small gap 20. The opening edge 21 of the outlet 19 has a sealing element 22, which seals the transition of the outlet 19 to the first channel section 8 formed in the first rotating body 7 relative to the surrounding gap 20.

[0039] The first rotating body 7 is rotatably supported on a first shaft 24 of the core element 11 arranged in a rotationally fixed manner by means of a ball bearing 23. A guide arm 25 with a guide eyelet 26 is arranged on the first rotating body 7 and extends through the outlet 19 into the feed chamber 6, which guide arm facilitates additional guidance of the filament 4 guided in rotation in the first channel section during the rotational movement of the first rotating body 7.

[0040] exist Figure 3 1 shows an enlarged view of a section of the device 1 according to the invention around the winding core 13. The second rotating body 10 is rotatably supported on a second shaft 28 of the core element 11 by means of a ball bearing 27. The second rotating body 10 is also rotatably supported in a housing 30 rigidly connected to the base 5 by means of a ball bearing 29.

[0041] The deformation device 12 is rigidly connected to the second rotating body 10. The filament 4 coming out of the second channel section 9 is transported through two rollers 31 that can be fixed to each other at a predeterminable distance and deformed here. The filament 4, which is still rotationally symmetrical and has a circular cross section, is deformed here into a filament 4 with an approximately rectangular cross section, which is beneficial for many application purposes of the spiral coil 2.

[0042] After exiting the outlet 16, the deformed filament 4 is continuously wound around the winding core 13 by the rotating second rotating body 10 and the rotational movement of the deformation device 12 fixed to the second rotating body, so that new turns of the filament 4 are always wound onto the winding core 13 and each new turn squeezes the previous turns that have been wound. Thus, the spiral coil 2 thus produced is continuously moved over the winding core 13 in the filament transport direction and finally moves down from the winding core 13 behind the end of the winding core 13.

[0043] exist Figure 4 1 shows a schematic cross-sectional view of the device 1 according to the invention. The second rotating body 10 is driven by an electric motor 33 via a gear drive 32 and undergoes a rotational movement. The second rotating body 10 is rotatably supported on the second axis 28 of the core element 11 in the housing 30. The first rotating body 7 is also rotatably supported on the first axis 24 of the core element 11. The first axis 24 and the second axis 28 of the core element 11 have a lateral offset relative to each other. This Figure 4 The lateral offset, which is shown greatly enlarged for the sake of illustration, may in practice be a few millimeters or less and serves to prevent a rotational movement of the core element 11 , which is therefore not rotationally symmetrical, within the rotating body of rotation 7 , 10 .

[0044] A gap 34 with a small gap width of less than 1 mm is configured between the first rotating body 7 and the second rotating body 10. Both the first rotating body 7 and the second rotating body 10 have magnetic elements 35 and 36 on the end faces facing the gap. The magnetic elements 35 and 36 facing each other facilitate the magnetic coupling of the first rotating body 7, which is not driven separately, to the second rotating body 10 driven by the electric motor 33, and cause the first rotating body 7 to be driven by the second rotating body 10 and be in a synchronous rotational motion.

Claims

1. A method for producing a helical coil (2), wherein: The filament (4) is transported along the filament transport direction through a first channel section (8) of a first rotating body (7), wherein the first rotating body (7) rotates around a first section of a core element (11) supported in a torsionally fixed manner, wherein the filament (4) is subsequently transported along the filament transport direction through a second channel section (9) of a second rotating body (10), wherein the second rotating body rotates synchronously with the first rotating body (7) around a second section of the core element (11) following the first section, and wherein the filament (4) is subsequently transported around a second channel section (9) of a second rotating body (10) following the first section. Two channel sections (9) are wound around a winding core (13) extending from a core element (11) in the direction of filament transport, thereby manufacturing a spiral coil (2) with a filament (4) by continuously feeding the turns of the filament (4) wound around the winding core (13), characterized in that a heated heating fluid (15) flows with overpressure through a first channel section (8) and a second channel section (9) arranged immediately thereafter, and thereby heats the filament (4) transported through the first channel section (8) and then through the second channel section (9).

2. The method according to claim 1, characterized in that The filament (4) emerging from the second channel section (9) is deformed by a deformation device (12) before being wound onto the winding core (13).

3. The method according to claim 2, characterized in that A thread (4) having a rotationally symmetrical cross section is fed to the first channel section (8) and the thread (4) is deformed in the deformation device (12) into a rotationally asymmetrical cross section.

4. The method according to claim 1, characterized in that The filament (4) is transported through a rotationally fixed feed chamber (6) before the first channel section (8) and supplied to the first channel section (8), and a heated heating fluid (15) is likewise supplied to the first channel section (8) via the feed chamber (6).

5. The method according to claim 2, characterized in that The heated heating fluid (15) flows through the deformation device (12) after exiting from the second channel section (9).

6. The method according to any one of the preceding claims 1 to 5, characterized in that The heated heating fluid (15) flowing out of the second channel section (9) is directed toward the winding core (13).

7. A device (1) for manufacturing a spiral coil, the device comprising: a core element (11) supported in a torsionally fixed manner; a first rotating body (7) supported in a manner rotating around a first section of the core element (11) extending along the core element (11) in the direction of filament transport; and a second rotating body (10) supported in a manner rotating around a second section of the core element (11) extending along the direction of filament transport and following the first section; and a winding core (13) extending from the core element (11) behind the second section in the direction of filament transport, wherein: The filament (4) is guided along the filament transport direction through a first channel section (8) in a rotating first rotating body (7) and then guided through a second channel section (9) in a synchronously rotating second rotating body (10), and then wound around a winding core (13), so that a spiral coil (2) can be manufactured using the filament (4) by continuously feeding the turns of the filament (4) wound around the winding core (13), characterized in that a torsionally supported feed chamber (6) is arranged before the first rotating body (7) along the filament transport direction, and the filament (4) fed from the stock can be introduced into the first channel section (8) through the feed chamber, wherein the feed chamber (6) is connected to a heating fluid stock, so that the heated heating fluid (15) is fed to the feed chamber (6) with overpressure and can then flow through the first channel section (8) and the second channel section (9) arranged immediately thereafter, The core element (11) has a first axis (24) in the first section, the first rotating body (7) is supported in a manner to rotate around the first axis, the core element (11) has a second axis (28) in the second section, the second rotating body (10) is supported in a manner to rotate around the second axis, and the first axis (24) is connected to the second axis (28) via a connecting device so that the center axis of the first axis (24) has a lateral offset relative to the center axis of the second axis (28).

8. The device (1) according to claim 7, characterized in that A deformation device (12) is arranged at the second rotating body (10) immediately following the output end of the second channel section (9) along the filament transport direction, and the deformation device can be used to deform the filament (4) coming out from the output end of the second channel section (9) and heated before being wound onto the winding core (13).

9. The device (1) according to claim 8, characterized in that The deformation device (12) has an inlet opening for a heated heating fluid (15) facing the outlet of the second channel section (9), and the deformation device (12) has an outlet opening (16) for the heated heating fluid (15).

10. The device (1) according to claim 9, characterized in that The outflow opening (16) of the deformation device (12) is aligned with the winding core (13).

11. The device (1) according to any one of claims 7 to 10, characterized in that The distance between the output end of the first channel section (8) of the first rotating body (7) and the input end of the second channel section (9) of the second rotating body (10) is less than 1 mm.

12. The device (1) according to any one of claims 7 to 10, characterized in that The distance between the output end of the first channel section (8) of the first rotating body (7) and the input end of the second channel section (9) of the second rotating body (10) is less than 0.5 mm.

13. The device (1) according to any one of claims 7 to 10, characterized in that The distance between the output end of the first channel section (8) of the first rotating body (7) and the input end of the second channel section (9) of the second rotating body (10) is less than 0.2 mm.

14. The device (1) according to any one of claims 7 to 10, characterized in that The first rotating body (7) of the rotating support and the second rotating body (10) of the rotating support are coupled to each other contactlessly by magnetic coupling.

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