Cleaning device for suction rollers and method for cleaning suction rollers

Abstract

The invention relates to a cleaning device, in particular for a suction roll of a facility for manufacturing or processing a web of fibrous material, wherein the cleaning device comprises a distribution line via which the cleaning nozzles can be supplied with a cleaning fluid and a plurality of cleaning nozzles, wherein at least one, in particular all, of the cleaning nozzles is embodied as an oscillating nozzle. Furthermore, the invention also relates to a suction roll and a method for cleaning a suction roll.

Description

Technical Field

[0001] The invention relates to a cleaning device, in particular for a cleaning device for a suction roll of a plant for producing or processing fibrous material webs, and to a suction roll and a method for cleaning a suction roll. Background Art

[0002] As in the production of nonwoven products, suction rollers or blow rollers are used at many locations in the production of paper, cardboard, or tissue products. These rollers have perforated roller covers. During operation of the suction roller, negative pressure is applied, causing a flow of air, water, or other fluid to be sucked through the perforations of the roller cover. Similarly, with blow rollers, overpressure is applied, causing the fluid flow to be blown through the roller cover.

[0003] The fluid flow through the perforations of the suction roll often carries with it more or less large dirt fragments. These can be mineral components, such as calcium from the water supply, mineral filler particles from the paper, or fibers or fines from paper or nonwoven products. These dirt fragments gradually settle at the edges of the perforations and completely or partially block them.

[0004] Even partial obstruction of the perforations in the roll shell can disrupt the production process. The impact is largely dependent on the task of the suction or blower roll. In suction rolls used to guide or stabilize a fibrous web, obstructed perforations can, for example, cause web flutter. In the case of suction press rolls, dewatering performance is reduced. In particular, uneven contamination of the perforations in the transverse direction of the roll can also impair web quality parameters, such as the transverse moisture distribution.

[0005] For this purpose, it may be helpful to clean the suction roller at regular intervals. However, this involves downtime of the production facility and complex disassembly and assembly of the roller, which results in high costs for the company.

[0006] Therefore, in the prior art, especially DE 10 2008 002 259, it is proposed to provide a suction roller with a cleaning device. Here, a cleaning head is installed in the interior of the roller, and this cleaning head has a plurality of nozzles, and cleaning fluid is sprayed out from the nozzles through perforations with a certain pressure to remove impurities.

[0007] Further cleaning systems of the aforementioned type are described in documents US Pat. No. 2,532,211 A, EP 1 314 815 and US Pat. No. 3,830,691 A.

[0008] In typical suction rolls used in the paper and nonwovens industries, the individual perforations have a small diameter of a few millimeters. Consequently, hundreds of these holes are arranged across a suction roll width of 10 m or more, and these holes may be staggered in a so-called drilling pattern. Therefore, it is technically and economically impossible to use a separate cleaning nozzle for each drilling hole. DE 10 2008 002 259 addresses this problem by implementing a movable cleaning head in the roll. By oscillating the cleaning head, a specific width of the roll jacket can be cleaned with a single nozzle.

[0009] Yet this solution is disadvantageous in that it is very expendable and expensive to be used in particular for moving the required assembly of the cleaning head. In addition, required machinery and hydraulic components always have a certain susceptibility to failure and need regular maintenance.

[0010] In addition, the cleaning device requires a relatively large installation space. This results in such a cleaning system not being able to be used in suction rollers with small diameters. Summary of the Invention

[0011] The object of the present invention is therefore to propose a cleaning device which overcomes the problems of the prior art and also to propose a suction roller and a method for cleaning such a suction roller.

[0012] This object is achieved completely by the cleaning device according to the invention, the suction roller according to the invention and the method according to the invention for cleaning a suction roller.

[0013] For ease of reading, the present invention has been described with the example of a suction roller. Unless otherwise clearly described, this should always also include a blowing roller.

[0014] In terms of a cleaning device, this object is achieved by a cleaning device, in particular a cleaning device for a suction roll of a facility for producing or processing fibrous webs, wherein the cleaning device comprises a distribution line and a plurality of cleaning nozzles, which can be supplied with a cleaning fluid via the distribution line. According to the invention, it is provided that at least one, in particular all, of the cleaning nozzles are designed as oscillating nozzles.

[0015] It is clear to a person skilled in the art that the cleaning nozzles must be arranged in such a cleaning device in such a way that the emerging fluid jet impinges on the object to be cleaned, for example a roller jacket or a perforation.

[0016] The term "fluid oscillator" or "fluid oscillator" is a long-known device that can generate a fluid jet that oscillates in a plane and thereby produces a fan-shaped pattern. Such an oscillator is described, for example, in European Patent Document EP 0 007 950 and the technical documents cited therein. Unlike conventional fan-shaped nozzles, the jet itself is not fan-shaped, but can be essentially point-shaped. By appropriately designing the nozzle geometry, the jet can oscillate back and forth. As in the embodiment of EP 0 007 950, which will be explained in detail below, no moving parts are required for this purpose, which makes the oscillator extremely low-wear and low-maintenance.

[0017] Such fluid oscillators have hitherto been used primarily in sectors such as the automotive industry. www.bowlesfluidics.com ) market such oscillators, for example, as wiper nozzles for headlights and windshields. The inventors have realized that such oscillators are also surprisingly suitable for cleaning suction rollers. They have demonstrated that such oscillators possess three features that, for use in cleaning devices, enable them to clean a defined area of ​​the roller shell (particularly in the CD (cross-machine direction)) and thus multiple adjacent perforations. Unlike the prior art, this occurs without the need for mechanical or hydraulic devices to move the nozzles. Furthermore, it has been demonstrated that the energy of the jet or fluid upon impact with the roller shell is sufficiently high to achieve an adequate cleaning effect. Finally, such oscillators can be manufactured very compactly, allowing the overall dimensions of the cleaning device to be significantly smaller than in the prior art. This makes it possible to meet existing manufacturer requirements and manufacture such cleaning devices for suction rollers with very small diameters, or in particular, with a very small distance between the suction box and the shell.

[0018] The oscillating nozzles are advantageously oriented so that the jet oscillations occur in the same direction in all oscillating nozzles, or the directions differ by only less than 10°. When such a cleaning device is installed in a suction roll in another unit of a fiber material machine or in another unit, oscillations in the CD direction can advantageously be achieved.

[0019] As described, the cleaning devices according to various aspects of the present invention are particularly suitable for cleaning suction rollers and blower rollers. However, these cleaning devices can also be advantageously used to clean or moisten other components of papermaking or nonwovens machines. By way of example, the cleaning or moisture conditioning of fabrics, in particular screens or felts, is mentioned here.

[0020] In a preferred embodiment, it can be provided that the jet emerging from the oscillating nozzle during the oscillation sweeps over an angle in the range between 90° and 170°, preferably between 110° and 130°, particularly preferably an angle of 120°.

[0021] In an advantageous embodiment, a first set and a second set of oscillating nozzles can be provided in the cleaning device, wherein the jet planes of the first set and the second set have different exit angles. In particular, it can be provided that one oscillating nozzle each from the first set and the second set is arranged alternately.

[0022] The advantage of the differently directed jets is that they impinge on the roller shell at different circumferential locations. This allows adjacent cleaning nozzles to be positioned virtually anywhere alongside one another without the risk of the emitted fluid jets crossing and thus impairing the cleaning effect, since the jets from adjacent nozzles always impinge on the roller shell slightly higher or lower, respectively. For this purpose, it has proven advantageous if the exit angles of the jet planes of the first and second sets differ by more than 2°, in particular by between 5° and 25°.

[0023] If necessary, a third emission angle, a fourth emission angle, etc. may be provided according to the application.

[0024] Here, unless otherwise specified, the ejection angle should be determined as the angle between the jet plane and the vertical line.

[0025] In the oscillators known from the prior art, the flow path is straight, that is, the direction of the fluid inflow into the oscillator is in the plane of the oscillating jet. With such oscillators, different exit angles of the jet plane can only be achieved by first varying the inflow direction.

[0026] Advantageously, the distribution line can be a cylindrical or substantially cylindrical tube. If the above-mentioned straight oscillator is installed at different angles into the distribution line, different emission angles can thereby be achieved.

[0027] However, this embodiment causes the structural size of the cleaning device to increase. In addition, it is desirable in terms of manufacturing technology that all cleaning nozzles can be inserted into the distribution line in a row and at the same angle.

[0028] It would therefore be highly desirable to be able to deflect the jet plane itself already in the nozzle. This would allow for a compact design and the described cleaning device to be used even in confined installation conditions. However, this cannot be achieved by simply bending the known oscillator geometry, as otherwise no oscillating jet would be formed.

[0029] To solve this problem, the inventors have modified the known fluid oscillator so that the jet plane is deflected already in the nozzle, but an oscillating jet is nevertheless maintained. These curved oscillating nozzles are themselves the subject of another invention and are described in detail in the following text of this application.

[0030] As already mentioned above, it can be advantageous for the cleaning device if at least some, in particular all, of the oscillating nozzles are of angled design, so that the jet plane is deflected in the interior of the nozzle.

[0031] For example, impurities in the cleaning fluid can clog the cleaning nozzles, especially oscillating cleaning nozzles, over time. Furthermore, damage to the cleaning nozzles can also occur due to wear during operation. Unlike the complex maintenance of cleaning devices described in the prior art, the cleaning device according to the present invention allows for simple replacement of the cleaning nozzles.

[0032] The replacement of the cleaning nozzle is particularly easy if the cleaning nozzle is connected to the distribution line via a detachable connection, in particular a screw connection or a plug connection.

[0033] In an advantageous embodiment, the cleaning nozzles are arranged side by side on the distribution line, wherein the distance between two adjacent cleaning nozzles is advantageously less than 500 mm, for example between 150 mm and 350 mm. It may be advantageous here for not all nozzles to be evenly spaced. In particular, in order to achieve a uniform cleaning effect, it may be advantageous to arrange the nozzles in groups of two, with the distance between the nozzles in the group of two being 1 / 2 of the nozzles. A Less than the spacing to the next pair I B For this purpose, further details will be explained with reference to the drawings. Alternatively, however, it may also be expedient if cleaning nozzles are arranged uniformly along the distribution line.

[0034] With regard to a suction roll, this object is achieved by a suction roll for a plant for producing or treating fibrous webs, wherein the suction roll comprises at least one cleaning device according to an aspect of the invention.

[0035] Although the cleaning device can in principle also be applied outside the suction roller, it is generally advantageous if the cleaning device is arranged inside the suction roller.

[0036] If the cleaning device is arranged inside the suction roller, the width of the area swept by the oscillating jet of the nozzle depends on the oscillation angle θW and the distance between the oscillating nozzle and the sleeve of the suction roller. This width is determined by the formula:

[0037]

[0038] Advantageously, one oscillating nozzle of a certain set (for example the first set or the second set) is spaced apart from the next nozzle of the set by a distance b. S or further away in order to avoid the oscillating jet being affected by the jet from the adjacent nozzle.

[0039] Furthermore, the invention comprises a method according to aspects of the invention for cleaning a suction roller.

[0040] In this case, the cleaning device can be acted upon by a fluid, in particular a water jet, wherein the fluid has a pressure of less than 40 bar, in particular less than 10 bar, preferably between 1 bar and 5 bar.

[0041] When the pressure is above 40 bar, the material of the cleaning device is subjected to very large loads, which causes rapid wear. However, in many cases, a sufficient cleaning effect can be achieved at lower pressures, particularly between 1 bar and 5 bar.

[0042] Furthermore, it can be advantageous to use less than 20 l / min / m, in particular between 9 l / min / m and 11 l / min / m, for cleaning. Very low water consumption is desirable from an economic and ecological perspective and simultaneously enables a good cleaning effect.

[0043] However, particularly when working with higher fluid pressures, in particular above 5 bar, it may also be helpful to clean with larger fluid volumes, for example 30 l / min / m, 40 l / min / m or more.

[0044] The described cleaning method can be carried out either continuously during operation of the suction roller or only in discontinuous cleaning intervals, which can occur during machine downtime.

[0045] As already mentioned above, the angled oscillating nozzle is a further subject matter of the invention, which can be used not only in the cleaning device according to aspects of the invention, but is also suitable for many other applications.

[0046] Starting from known fluid oscillators, such as EP 0 007 950, a further object of the present invention is to specify an oscillator, in particular an oscillating nozzle, in which the direction of entry of the fluid into the oscillator does not lie in the plane of the oscillating jet.

[0047] This object is achieved by an oscillating nozzle, in particular for a cleaning device according to the first aspect of the invention, wherein the oscillating nozzle comprises a fluid oscillator and is designed to be bent so that the jet plane is deflected in the interior of the nozzle, characterized in that the deflection occurs after the fluid oscillator.

[0048] Fluid oscillators in curved nozzles typically include an oscillation chamber after the oscillator inlet and often include one or two return channels. These same shapes and arrangements induce oscillations in the fluid jet, which then exits the fluid oscillator at the outlet. While this type of oscillator design is advantageous, the present invention is not limited thereto.

[0049] Attempts to adjust the angle in the region of the oscillator usually fail because the formation of oscillations is thereby prevented or made more difficult. The inventors have therefore found that it is advantageous to adjust the angle after the output of the oscillator.

[0050] In an advantageous embodiment, the nozzle geometry is designed so that the fluid is guided through at least two channels separated by an island after the oscillation chamber. This area is referred to as the subsequent area (Nachlaufbereich). The deflection of the jet plane is preferably realized in this subsequent area. Advantageously, these channels can be symmetrical. It can also be advantageous that the width of the channel is constant or at least constant to a large extent in its direction. It should be understood that the width of the channel in the starting area and the ending area can deviate from the width in the remaining areas. This embodiment has been proven to be extremely advantageous because a very wide range of angles can be achieved without compromising the effect of the oscillator.

[0051] The inventors have found that it is particularly advantageous to provide a subsequent region and to position the deflection in the subsequent region. Although the internal structure of the oscillator or the entire flow chamber is complex, a nozzle of the type described can be manufactured very simply and cost-effectively through an additive process ("3D printing"). The nozzle can be made of a variety of materials, such as metal and / or polymer materials. However, a disadvantage of such additively manufactured nozzles is that the internal surface of the flow chamber often has a relatively high roughness, and post-processing inside the nozzle is difficult or even impossible. This internal roughness results in most of the fluid being discharged in the region of the deflection points of the oscillating jet when using a nozzle without a subsequent region. As a result, only a limited opening angle can be achieved, because otherwise the fluid is no longer sufficiently discharged in the region between the deflection points. By placing the subsequent region at the rear, preferably in the annular shape described, a significantly uniform discharge of the fluid can be achieved. In addition, it has been surprisingly demonstrated that the nozzle can be adjusted in a very wide angle range in the subsequent region without thereby compromising the oscillating structure.

[0052] In a particularly advantageous embodiment, it can be provided that the jet plane is deflected by an angle of between 1° and 90°, in particular between 5° and 45°.

[0053] Furthermore, it is advantageous to provide at least one lip at the outlet of the oscillating nozzle downstream of the outlet opening in order to prevent the jet from expanding perpendicularly to the jet plane. It can be particularly advantageous to provide two lips. This prevents the jet from expanding upwards and downwards.

[0054] Advantageously, the length of the lip may be at least three times as long as the width of the oscillator inlet.

[0055] Although it is clear to a person skilled in the art from the preceding discussion, it is emphasized once again that the term "interior of the nozzle," i.e., the region where the jet plane is deflected, refers to the region between the inlet, in particular the oscillator inlet, and the outlet opening. The flow chamber with the oscillator and the subsequent region is located there. Therefore, a lip that may be provided does not belong to the interior of the nozzle.

[0056] The lip or lips are usually not bent or curved, but are designed to be straight. A bending or curvature of the lip is also not necessary for deflecting the jet, since the bending already occurs inside the nozzle.

[0057] Nevertheless, it may be expedient in certain cases to provide an additional bend or an additional angled portion in the region of the lip. Such embodiments are also encompassed by the present invention.

[0058] In a preferred embodiment, it can be provided that the emerging jet sweeps over an angle in the range between 90° and 170°, preferably an angle in the range between 110° and 130°, particularly preferably an angle of 120°.

[0059] Depending on the desired application or availability, the bent oscillating nozzle can be made of a variety of materials. Metals such as steel, aluminum, etc. are used for this purpose, as well as synthetic materials such as polyamide, in particular PA12 or polyethylene.

[0060] In a preferred embodiment, the nozzle can be embodied in one piece.

[0061] Another significant advantage is that these nozzles can also be manufactured using additive processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Further advantageous features of the invention are explained with reference to the accompanying drawings based on exemplary embodiments. The features mentioned can be advantageously realized not only in the combinations shown, but also individually in combination with one another. The accompanying drawings show in detail:

[0063] Figure 1a 、 1b 1c shows a fluid oscillator of the prior art;

[0064] Figure 2Schematically illustrates a cross section through the structure of a bent oscillating nozzle according to aspects of the present invention;

[0065] Figure 3 schematically illustrating a view of a bent oscillating nozzle according to aspects of the present invention;

[0066] Figure 4 Schematically shows a section of a cleaning device according to another aspect of the present invention;

[0067] 5a, 5b and 5c are details of a cleaning apparatus according to aspects of the present invention.

[0068] Next, the drawings are described in detail. DETAILED DESCRIPTION

[0069] Figure 1a 、 1b 1a and 1c schematically illustrate different designs of fluidic oscillators, as are known from the prior art. These fluidic oscillators are suitable for use in oscillating nozzles 20 according to various aspects of the present invention. However, the present invention is not limited to these embodiments of fluidic oscillators. In general, all types of fluidic oscillators are suitable.

[0070] The fluid can enter the flow space through the inlet 1. If necessary, Figure 1c As shown, an acceleration nozzle, for example, in the form of a taper, can be provided. The fluid then enters the oscillation chamber 3. Depending on the type of oscillator, a flow barrier 6 in the form of an island 6 can be provided in the oscillation chamber 3. Alternatively or additionally, a return flow channel 4 can also be provided, which guides part of the fluid flow back in the direction of the inlet 1. The fluid leaves the oscillator at the outlet 7 as an oscillating jet 10.

[0071] exist Figure 1a In the embodiment according to , the flow body passes straight through the oscillator, that is to say the direction of flow into the inlet 1 is in the plane of the oscillating jet 10. Figure 1b and 1c In the embodiment of the invention, the flow body inlet 1 is located at the bottom. The deflection of the flow takes place before the oscillator itself.

[0072] Figure 2 A bent oscillating nozzle 20 according to aspects of the present invention is shown. In this embodiment, fluid is introduced into the nozzle 20 via inlet 1. Advantageously, but not necessarily, the fluid is then introduced into the oscillator chamber 3 via the oscillator inlet 3a through the acceleration nozzle 2. Figure 2 FIG shows an oscillator including a return channel 4. At the location where the outlet 7 is arranged in the known oscillator, Figure 2The nozzle in the nozzle has a constriction 5. The fluid is then guided through two channels 12 separated by an island 6. It is very advantageous if the channels and the island 6 have a high degree of symmetry. In particular, the island 6 can be embodied in the form of a circle, an ellipse, a droplet or the like.

[0073] The channels 12 are merged again behind the island 6, and the fluid then leaves the nozzle 20 as an oscillating jet via the outlet 7. The area between the constriction 5 and the outlet 7 is called the subsequent area 11. Here, the subsequent area 11 together with the oscillator forms the interior of the nozzle 20. In order to achieve that the oscillating jet 10 and the inflow direction are not in the same plane, the oscillating nozzle 20 is implemented in a bent manner. In order not to interfere with the action of the oscillator, the nozzle 20 is bent at an emission angle in the subsequent area. Advantageously, the emission angle can be between 1° and 90°, in particular between 5° and 45°. Figure 2 An angle of 30° is shown by way of example in FIG.

[0074] In order to prevent the oscillating jet 10 from expanding after the outlet 7, Figure 2 The nozzle 20 even has a lip 8. This lip can prevent the jet from deflecting downwards. Alternatively or in addition, it can also be provided that a lip 8 is provided to prevent the jet from deflecting upwards. One lip 8 or multiple lips 8 are provided in the nozzle 20. Figure 2 The lip 8 is not bent or curved in the middle, but is designed to be straight. A bend or curvature of the lip 8 is also not necessary for deflecting the jet, since the bend already occurs inside the nozzle 20. Nevertheless, in certain cases it may still be useful to provide an additional bend or additional angle in the area of ​​the lip 8.

[0075] Such bent oscillating nozzles 20 can be used for a variety of purposes. In particular, they are excellently suitable for use as oscillating nozzles 20 in cleaning devices 100 according to aspects of the present invention.

[0076] exist Figure 3 The figure shows a curved oscillating nozzle 20 according to aspects of the present invention from the outside in different views. The flow path inside is indicated by dashed lines. Here, B1 represents the inlet width after the acceleration nozzle 2, B2 the width of the constriction 5, B3 the width of the channel 12, and B4 the width of the outlet 7. These four widths B1 to B4, combined with the length of the lip 8, influence the characteristics of the oscillating jet 10. When widths B1 and B2, i.e., the inlet width and the constriction width, are equal, a jet distribution range of 120° in the jet plane can be achieved, for example, which has proven to be extremely advantageous. The channel width and the outlet width can be slightly wider than the inlet width B1.

[0077] The following combinations are particularly advantageous:

[0078] B2=B1

[0079] B3=1.25*B1

[0080] B4=1.5*B1.

[0081] The absolute values ​​of these widths naturally depend largely on the application and the desired flow rate. For use as an oscillating nozzle 20 in a cleaning device 100 according to aspects of the invention, the width B1 can be selected, for example, between 1 mm and 5 mm, in particular 2 mm.

[0082] Advantageously, the geometry of the flow space remains the same over its entire height. Figure 2 In the embodiment in FIG, the height H is chosen to be equal to the inlet width B1. This results in a square cross section of the inlet 1.

[0083] Advantageously, the length of the lip 8 may be at least three times as long as the inlet width B1 . This facilitates achieving a bundled jet 20 in the normal direction.

[0084] A particularly advantageous embodiment of the oscillating nozzle therefore has the following dimensions:

[0085] B1 B2 B3 B4 H lip 2mm 2mm 2.5mm 3mm 2mm ≥6mm

[0086] exist Figure 2 and 3 The nozzles 20 shown in FIG. each have a threaded base. This facilitates connection to the fluid supply line. Alternatively, the connection can be achieved, for example, via a plug connection. In both cases, nozzles 20 can be easily replaced. However, other connection types may also be provided depending on the application, particularly a non-detachable connection to the fluid supply line.

[0087] Figure 4 A section of a cleaning device 100 according to aspects of the invention is shown. This cleaning device 100 can be used in particular as a cleaning device 100 for a suction roll 130 of a facility for producing or processing fibrous material webs. A plurality of cleaning nozzles 120a, 120b are applied to a distribution line 110, which is designed as a distribution pipe 110. These cleaning nozzles can be supplied with a cleaning fluid, for example a water jet, from the distribution line 110. The cleaning fluid can be supplied to the distribution line 110 via a single fluid connection 111 or via a plurality of fluid connections 111. Figure 4 In the embodiment, the cleaning nozzles are all implemented as oscillating nozzles 20. It is particularly advantageous if the cleaning nozzles are designed as bent oscillating nozzles 20; Figure 2 and 3 described in . Figure 4The embodiment in FIG. 1 has a first set 120a and a second set 120b of curved cleaning nozzles, wherein the jet planes of the first set 120a and the second set 120b have different exit angles. An angle difference of 5° to 10° is generally advantageous. Thus, for example, the exit angle of the first set 120a can be 30°, and the exit angle of the second set 120b can be 35°.

[0088] Advantageously, the distance between two adjacent cleaning nozzles is between 150 mm and 350 mm. Figure 4 1 shows a cleaning device 100 in which the spacing of the cleaning nozzles varies. Here, the cleaning nozzles are positioned in groups of two, for example, one nozzle from a first set and one nozzle from a second set. This can be advantageous, as will be described later according to Figure 5c As explained.

[0089] But alternatively, the spacing of adjacent cleaning nozzles also can be equal, for example 250mm.However, for example also can be provided that in less polluted zone (for example at the edge of suction roller 130) the spacing between cleaning nozzles can be provided larger than in other zones.

[0090] According to Figures 5a, 5b and 5c, a possible method for positioning a cleaning nozzle in a cleaning device according to aspects of the present invention is illustrated. Figure 5a shows the installation of the cleaning device 100 in the suction roller 130. Here, the distribution line 110 extends parallel to or at least as parallel as possible to the axis of the suction roller 130. The cleaning device 100 comprises, for example, an oscillating nozzle 20 of a first set 120a and a second set 120b of alternatingly arranged bends. The respective ejection angles are represented by θ1 and θ2. The spacing between the cleaning device 100 and the housing of the suction roller 130 (measured from the ejection point of the jet leaving the nozzle) is 1 d . Figure 5b shows the device in Figure 5a in a top view. The oscillation angle θW, that is, the angle swept by the oscillating jet 10 during oscillation, can be seen here. This oscillation angle can be between 90° and 170°, for example. As can be seen in Figure 5b, the nozzles 20 can be arranged so that the areas in which the oscillations of the jets 10 occur at adjacent nozzles overlap. It is advantageous here that adjacent nozzles 20, 120a, 120b each have different emission angles θ1, θ2. As a result, the jet planes of adjacent nozzles are located in space in such a way that the jets do not touch each other and thus do not interfere with each other. As can be seen in Figure 5a, the jet of the first collecting nozzle with θ1 impinges on the sleeve of the suction roller 130 above the jet of the second collecting nozzle with θ2.

[0091] therefore, Figure 5cThis demonstrates that overlapping adjacent jet zones according to aspects of the present invention is not only easily achievable but also advantageous. The diagram shows the volume flow of fluid from four adjacent oscillating nozzles 20. A typical "M-shaped profile" can be seen here, meaning that less fluid per unit time impinges on the suction roller 30 in the center of the sweep zone than toward the edges. This is typical for oscillators. As described, the use of the subsequent zone 11 can even out the fluid distribution, thereby enabling a wider oscillation angle θW or a wider sweep zone b. S greater. This allows the cleaning device 100 to be implemented with fewer nozzles 20. It can be seen that the nozzles of the first set 120a are positioned so that their jets do not collide with each other. The nozzles of the second set 120b can now be positioned so that areas with high fluid volume flows are located where the nozzles of the first set 120a experience lower volume flows, and vice versa. This allows the center of the housing of the suction roller 130 (or other moving surface to be cleaned or wetted) to be uniformly loaded with fluid across its width.

[0092] In addition, Figure 5c Parameter b in S The width of the area swept by the oscillating jet 10 is described. This width is obtained by means of the oscillation angle θW and the distance between the oscillating nozzle 20 and the housing of the suction roller 130:

[0093]

[0094] It has proven to be advantageous to clean the nozzles as Figure 4 As shown, one nozzle of the first set and one nozzle of the second set are positioned in a group of two. The two nozzles of a group have a spacing of I A , and the distance between this group and the first nozzle in the next group of two is I B Here preferably, I A =0.25b S And I B =0.75b S This results in a particularly uniform cleaning of the suction roller 130. Typically, the spacing should be selected as follows:

[0095] l A ∈[0.2,0.3]b S ; l B ∈[0.7,0.8]b S .

[0096] Reference Signs List

[0097] 1: Entrance

[0098] 2: Acceleration nozzle

[0099] 3: Oscillation chamber

[0100] 3a: Oscillator entry

[0101] 4: Return channel

[0102] 5: Contraction

[0103] 6: Island

[0104] 7: Exit opening

[0105] 8: lips

[0106] 9: Shooting angle

[0107] 10: Oscillating jet

[0108] 11: Subsequent Areas

[0109] 12: Channel

[0110] 15: Flow Chamber

[0111] 20: Oscillating nozzle

[0112] 100: Cleaning equipment

[0113] 110: Distribution Line

[0114] 111: Fluid interface

[0115] 120a: First set

[0116] 120b: Second set

[0117] 130: Suction roller

Claims

1. A cleaning device (100), wherein: The cleaning device is a cleaning device for a suction roll (130) of a facility for producing or processing a fibrous web, wherein the cleaning device (100) comprises a distribution line (110) and several cleaning nozzles (20) which can be supplied with a cleaning fluid via the distribution line (110), characterized in that more than one cleaning nozzle (20) is designed as an oscillating nozzle, wherein the oscillating nozzle is designed as a fluid oscillator, which generates a fluid jet (10) oscillating in a jet plane, wherein at least some of the oscillating nozzles are designed to be bent so that the jet plane is deflected in the interior of the oscillating nozzle, wherein the fluid is guided after the oscillation chamber of the fluid oscillator through at least two channels separated by an island designed as a flow barrier, wherein the channels are located in a subsequent region in which the jet plane is deflected, wherein the channels merge again behind the island, wherein not all oscillating nozzles are evenly spaced apart, and wherein the oscillating nozzles are arranged in groups of two, and the spacing (I A ) is less than the distance to the next pair (I B ).

2. The cleaning device (100) according to claim 1, characterized in that An oscillating nozzle is provided with a first set (120a) and a second set (120b), wherein the ejection angle of the jet plane of the first set (120a) and the ejection angle of the jet plane of the second set (120b) are different from each other, wherein the ejection angle is the angle between the jet plane and a vertical line.

3. The cleaning device (100) according to claim 2, characterized in that Each oscillating nozzle in the first set (120a) and the second set (120b) is arranged alternately.

4. The cleaning device (100) according to claim 1, characterized in that The jet plane is deflected by an angle between 1° and 90°.

5. The cleaning device (100) according to claim 2 or 3, characterized in that The ejection angles of the jet planes of the first set (120a) and the second set (120b) differ by more than 2°.

6. The cleaning device (100) according to any one of claims 1 to 4, characterized in that The cleaning nozzle (20) is connected to the distribution line (110) via a releasable connection.

7. The cleaning device (100) according to any one of claims 1 to 4, characterized in that The cleaning nozzles (20) are arranged at intervals of less than 500 mm.

8. The cleaning device (100) according to any one of claims 1 to 4, characterized in that The fluid jet (10) sweeps through an oscillation angle θW in the range between 90° and 170°.

9. The cleaning device (100) according to any one of claims 1 to 4, characterized in that The at least one oscillating nozzle is formed completely or partially from metal or plastic.

10. The cleaning device (100) according to claim 1, characterized in that All cleaning nozzles (20) are designed as oscillating nozzles.

11. The cleaning device (100) according to claim 1, characterized in that All oscillating nozzles are designed to be angled.

12. The cleaning device (100) according to claim 4, characterized in that The jet plane is deflected by an angle between 5° and 45°.

13. The cleaning device (100) according to claim 2 or 3, characterized in that The difference in ejection angles of the jet planes of the first set (120a) and the second set (120b) is between 5° and 25°.

14. The cleaning device (100) according to claim 6, characterized in that The cleaning nozzle (20) is connected to the distribution line (110) via a screw connection or a plug connection.

15. The cleaning device (100) according to claim 7, characterized in that The cleaning nozzles (20) are arranged at intervals between 150 mm and 350 mm.

16. The cleaning device (100) according to claim 8, characterized in that The fluid jet (10) sweeps through an oscillation angle θW of 120°.

17. The cleaning device (100) according to claim 9, characterized in that All oscillating nozzles are formed completely or partially from metal or synthetic material.

18. A suction roll (130) for a plant for producing or treating fibrous material webs, characterized in that The suction roller (130) comprises at least one cleaning device (100) according to any one of the preceding claims.

19. The suction roller (130) according to claim 18, characterized in that The cleaning device (100) is arranged inside the suction roller (130).

20. Method for cleaning a suction roller (130) according to claim 18 or 19, characterized in that The cleaning device (100) is acted upon by a fluid, wherein the fluid has a pressure of less than 40 bar.

21. The method according to claim 20, characterized in that Use less than 20 l / min / m of fluid for cleaning.

22. The method according to claim 20, characterized in that The cleaning device (100) is loaded with a water spray.

23. The method according to claim 20, characterized in that The fluid has a pressure of less than 10 bar.

24. The method according to claim 20, characterized in that The fluid has a pressure between 1 bar and 5 bar.

25. The method according to claim 20, wherein Use a fluid volume between 9 l / min / m and 11 l / min / m for cleaning.

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