AT508054A1 - CLEANING DEVICE FOR A FIREPLACE - Google Patents

Description

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Patent Attorneys HefelSHofmann

European Patent Attorneys

Dipl.-Ing. Herbert Hefel (until 2006) Mag. Ralf Hofmann A-6806 Feldkirch, Austria Egelseestr 65a, PO Box 61 22287 34 / ir 20090210 1

The invention relates to a cleaning device for a fireplace, a fireplace with such a cleaning device and a method for operating such a cleaning device.

In chimneys, are derived by the flue gases from firing systems of various kinds, it often comes to the fireplace inner wall to deposits of soot and other dust particles, which must be removed from time to time by the fireplace inner wall again. In the prior art, it is even known, the deposition of dust and soot particles on the chimney inner wall or on upstream electrodes targeted by the application of electrical, preferably electrostatic fields bring about. Especially in chimneys of this type with so-called electrostatic precipitators generic cleaning devices are required to clean the chimney inside walls or otherwise formed as electrodes surfaces from time to time from the deposited dust and soot particles. In DE 43 06 228 A1 a generic cleaning device for a fireplace is briefly indicated. Here is spoken by a circumferentially driven or up and down movable Abkratzvorrichtung that scrapes the dust layer at regular intervals.

Object of the present invention is to provide a generic cleaning device for a fireplace, which is structurally simple as possible and also works reliably over time.

This is inventively achieved by the cleaning device comprises a first suspension and at least a second suspension and at least one actuator and the suspensions are connected by means of ropes and / or chains extending between them and at least one, preferably the second, the suspensions of the actuator against the other, preferably the first, the suspensions is rotatable.

According to the invention is thus provided to provide a kind of curtain of ropes and / or chains between a first suspension and a second suspension. An actuator ensures that at least one of the suspensions can be rotated against the other suspension. If you let go of one of the suspensions or turn it up, please contact us. T +43 (0) 5522 73 137 F +43 (0) 5522 73 359 M office@vpat.at I www.vpat.at VAT ATU 64196033

Bank accounts

Sparkasse der Stadt Feldkirch Account No. 0400-006300, bank code 20604 Swift-Code: SPFKAT2B IBAN: AT70 2060 4004 0000 6300 Austrian Postal Savings Bank Account No. 92.111.622, Bank Code 60000 Swift Code: OPSKATWW IBAN: AT55 6000 0000 9211 1622 ·· ····:; ···························································································································································································································································· beat against each other to clean themselves or the chimney inner wall or other attached or arranged there electrodes during this oscillatory movement or to free from the deposited dust and / or soot particles. Of course, it is also possible that both suspensions, e.g. in opposite directions of rotation, be actively rotated. Ultimately, all that matters is that the two suspensions are twisted relative to each other. In particularly preferred embodiments, the ropes and / or chains themselves form the essential deposition surface for the dust and / or soot particles, so that it is sufficient if the dust and / or soot particles are removed from the ropes and / or chains by said oscillatory movement. In this case, the ropes and / or chains do not necessarily have to run along the chimney inner wall in order to remove dust and / or soot from it. In any case, the ropes and / or chains also have the advantage that the flow velocity is reduced between them and thus the deposition of dust and / or soot, in particular on the ropes and / or chains, is favored.

A chimney with such a cleaning device conveniently provides that inside the chimney the first suspension is fixed above the second suspension and the second suspension by means of the cables and / or chains, preferably free of the actuating device, hangs on the first suspension.

In a method according to the invention for operating such a cleaning device, in particular in such a chimney, it is advantageously provided that at least one, preferably the second, of the suspensions of the actuating device from a first operating position against the other, preferably the first, the suspensions in a second operating position is rotated and then the one of the suspensions is rotated back into the first operating position, wherein at least one twisting of the suspensions the ropes and / or chains to each other and / or rub against the chimney inner wall. If it is only about ridding the ropes and / or chains of dust and / or soot particles, already a swinging of the ropes and / or chains may be sufficient for cleaning without them touching each other or the chimney inner wall. The cables and / or chains are preferably stretched in said first operating position and rotated in the second operating position about a common axis. It is expediently provided for the first and / or second suspension to have (comprise) or form (form) around a central through-opening a substantially circumferentially closed, preferably substantially ring-shaped or tubular frame. Circumscribed in this sense, first of all, rings, pipe sections but also polygons and other, self-contained frame. However, these frames can also be interrupted in at least one place, without their function being restricted. In this sense, it is sufficient if they are essentially circumferentially closed.

Particularly preferably, it is provided that the cables and / or chains are arranged not only in a limited area along the circumferential direction of the frame. Rather, it is conveniently provided that in at least one, preferably all, suspensions the ropes and / or chains in the circumferential direction over the entire frame, preferably equidistant, are distributed to this attached.

The ropes and / or chains do not necessarily constantly abut each other. It is sufficient if, in an operating position in which the cables and / or chains are stretched, in each case two mutually adjacent cables and / or chains spaced apart on the frame of at least one of the suspensions are mounted.

Further details and features of preferred embodiments of the invention will become apparent from the following description of an embodiment of the invention. Showing:

1 is a perspective view of the embodiment of a fireplace with a cleaning device according to the invention, wherein the fireplace is shown transparent,

Fig. 2 like a longitudinal section through the fireplace. Fig. 1,

3 essential parts of the cleaning device without fireplace Fig. 4 shows the detail A of FIG. 2nd

5 shows a horizontal section along the section line BB shown in FIG. 2;

Fig. 6 and 7 an alternative type of actuator;

Fig. 8 shows a further alternative for the formation of an actuating device.

Among other things, with the invention it is possible, in particular for biomass boilers up to 1 megawatt, to build a practicable and inexpensive electrostatic precipitator according to a corona method in the form of a chimney with a larger diameter and electrostatic charge and separation, which replaces electrostatic precipitators known per se in the prior art. For the escape of the flue gases, a residual dust content of significantly less than 50 mg / Nm3 (milligrams per standard cubic meter) is desired. It is advantageous if an inner diameter of the chimney 1 of at least 70 cm, preferably of at least 1 m, is realized in order to reduce the flow velocity in the chimney. This can, as implemented in the embodiment shown, for example, be equipped to about 90% of its length with a spray electrode. In the case of doubt, the length of the chimney 1 through which the exhaust gas flows, or the separation zone of the chimney 1, is understood as the length of the chimney 1. Preferred chimneys are designed in such a way that the mean flow velocity, based on the volume flow in standard cubic meters, is less than 1 m / s. Dust or soot particles that are in the vicinity of the first ····························································

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Electrode 13 and spray electrode are charged by the known corona method by sprayed electrodes and move to the chimney 1 to deposit on the chimney inner wall 11 and / or on the ropes and / or chains 4.

The chimney system shown by way of example represents a combination of a separating cyclone 17, a chimney 1 and an electrostatic filter. The flue gas enters the chimney 1 from a boiler (not shown here), if necessary already accelerated via a blower (also not shown here). This can z. B. made of metal, such as preferably stainless steel. Other known constructions of chimneys 1 are possible. The flue gas is set in the illustrated embodiment via a centrally installed in the chimney cyclone pipe 17 in rotation. This cyclone tube 17 is conveniently about half the chimney diameter. The rotational component receives the flue gas through the tangential inflow into the cyclone tube 17, which is generated by the side attached to the cyclone tube 17 flue gas inlet nozzle 16. The cyclone tube 17 is closed at the bottom with a lid, so that the flue gas can leave the cyclone tube only upwards. When leaving the cyclone tube 17 coarse dust or soot particles are already carried to the outside due to the centrifugal forces of the swirling flue gas and deposited there because of the lower flow rate in the larger chimney diameter. The cyclone tube 17 may over its entire length of z. B. about 1m have a constant diameter or moderately widening towards the top to form a diffuser.

The spiral flow of the flue gas reached via the cyclone tube 17 ensures a uniform distribution of the flue gas in the chimney 1 and ensures that the subsequent electrostatic charge reaches as many soot particles or dust particles. At the upper end of the cyclone tube 17, the electrostatic charging and deposition zone begins. About special thermally, mechanically and Kriechstromresistente insulating tapes 18, z. B. polytetrafluoroethylene, the central first electrode 13 and spray electrode in the lower region of the charging zone on the chimney 1 or the cyclone tube 17 is held and centered. At the upper end, it is also in the illustrated embodiment also centrally isolated by one or more such insulator bands 18 on the chimney 1. For the defined bias of the first electrode 13, a coil spring (not shown here in detail) may be interposed between the bands 18 and the first electrode 13.

Preferably, the central first electrode 13 ends down as a tip in the region of the upper end of the cyclone tube 17 or may even extend into this. Preferably, the first electrode 13 is designed as a barbed wire with defined peaks in order to avoid an undefined, pollution-dependent corona. An operating voltage between the first electrode 13 and the chimney inner wall 11 or the cleaning device or its cables and / or chains 4 is applied via the voltage source 14. This may be a preferably regulated DC voltage, preferably with negative polarity and a height of 40 to about 100 kV (kilovolts) or more. The counterelectrode can be formed by the chimney 1 and / or the cables and / or chains 4. These counterelectrodes are preferably connected to ground 15.

Below the cyclone 17, the chimney 1 runs in a funnel shape and opens into an ash box 20, which can be emptied from time to time.

In order to be able to remove the dust and soot particles deposited on the chimney inner wall 11 or on the ropes and / or chains 4, the chimney 1 has a cleaning device according to the invention. The cleaning device has a first suspension 2 and at least one second suspension 3 and at least one actuating device 10. The suspensions 2 and 3 are connected to each other by means of cables extending between them and / or chains 4. In the illustrated embodiment, it is exclusively chains 4, z. B. of metal. But it can also be any other ropes, preferably also made of metal, or ropes and chains 4 are used. By means of the actuator 10, the one of the suspensions 2 or 3 can be rotated against the other of the suspensions 2 or 3. Conveniently, the first or upper suspension 2 is fixed in place within the fireplace. The second suspension 3 then hangs freely by means of the cables and / or chains 4, preferably apart from the actuating device 10, on the first suspension 2 in the chimney. Notwithstanding the example shown here, it would also be possible to actively rotate the upper suspension 2 with a corresponding actuating device and let the lower suspension 3 hang freely, or to actively rotate both suspensions 2 and 3 by means of corresponding actuating devices, preferably in mutually opposite directions of rotation , In any case, it is preferably provided that one of the suspensions 2 or 3, in this case the second or lower suspension 3, can be rotated against the other suspension 2 about a common longitudinal central axis 8 of the suspensions 2 and 3. This longitudinal central axis 8 is shown in Fig. 3, in which the cleaning device without chimney 1 is shown. When installed in the chimney, as shown in FIGS. 1 and 2, the longitudinal central axis 8 of the cleaning device advantageously coincides with a chimney longitudinal axis 12. The fireplace longitudinal axis 12 is preferably the symmetry axis with respect to the chimney inner wall 11 is symmetrical. Conveniently, the already mentioned first electrode 13 as a at least partially along the chimney longitudinal axis 12 extending wire, preferably barbed wire formed.

The chains 4 and corresponding ropes form a concentrically arranged chain or. Rope curtain, as he can be seen particularly well in Fig. 3. For this purpose, it is expediently provided that the first and / or the second suspension 2 and 3 have or form a substantially peripherally closed, preferably substantially ring-shaped or tubular, frame 6 or 7 around a respective central passage opening 5. The ropes and / or chains 4 are then conveniently distributed over the entire frame 6 or, 7 attached thereto. The attachment points of the cables and / or chains are preferably distributed equidistantly around the entire frame. In this sense, it is thus provided that in each case two mutually adjacent cables and / or chains 4 are spaced apart from one another on the frame 6 from............ or 7 are attached. The distance between the chains 4 and ropes of the chimney inner wall 11 is conveniently only a few centimeters. In this sense, it is preferably provided that the cables and / or chains 4 in the operating position shown in FIGS. 1 to 3, in which the cables and / or chains 4 are stretched, less than 5 cm, preferably less 3 cm, of the respective nearest area of the chimney inner wall 11 are spaced. In order to clean the entire surface of the chimney inner wall 11, on which soot and dust particles deposit, it is advantageously provided that the longitudinal extent of the cleaning device, preferably the ropes and / or chains 4, in an operating position in which the ropes and / or Chains 4 are stretched, at least a 5 times the largest inner diameter of the chimney is 1. In particularly preferred embodiments, the cleaning device or the ropes and / or chains 4 extend over the entire length of the chimney 1, wherein with respect to the length 1 of the chimney in doubt the definition given above is to be used. It is expediently provided that the one of the suspensions 2 or 3, that is to say here the lower suspension 3 in the embodiment shown, can be moved by at least 45 °, preferably by at least 90 °, against the other of the suspensions 2 or 3, by the already mentioned actuating device 21. So here the upper suspension 2, is rotatable. As actuation device 21, a variety of known in the prior art actuators come into question. Preferred embodiments provide that the actuating device has at least one, displaceable on at least one of the suspensions 2 or 3, preferably on the second or lower suspension 3, tangentially to its circumferential direction, displaceable element. Such movable elements can, for. As the concretely shown in Fig. 3 cable 9, but also other hydraulically or pneumatically actuated slide, to name just a few examples. It is also conceivable to provide a compressed air source or another source with pressure medium for acting on the suspension 2 or 3 to be twisted tangentially to its circumferential direction. Alternatively, gear transmissions may be provided to rotate one of the suspensions 2 or 3 against the other or both against each other. In the first concretely illustrated exemplary embodiment according to FIGS. 1 to 5, a solution by means of cable pull 9 is shown. The cable 9 is fixed to a fixing point 21 on one of the suspensions, here on the lower suspension 3. From there, the cable 9 runs, preferably guided by a channel or the like, a certain distance in the circumferential direction around the suspension 3 around. In the operating condition shown in Fig. 3, in which the chains 4 and ropes are stretched, the cable 9 should run around at least such a large angular range around the suspension 3, as the suspension 3 is to be rotated. In the illustrated embodiment, the cable 9 is then fed to a drum 22 of the actuator 10 and drummed on this. A motor 23 provides for the rotation of the drum 22 and thus for pulling on the cable 9. In the illustrated embodiment, the actuating device 10 is partially disposed outside the chimney 1. Accordingly, an opening 19 is provided in the chimney through which the cable 9 is passed. Of course, this does not necessarily have to be the case. On the opening 19 ···················································· ···· Can also be dispensed with if the actuating device 10 is arranged inside the chimney 1. As an alternative to motor 23 and drum 22 can also be provided that is pulled by hand on the cable 9.

Overall, it should be noted that the type shown in FIGS. 1 to 3 of the actuator 10 is of course only one of many possible examples of how one suspension 3 can be rotated against the other suspension 2. Further variants are described below with reference to FIGS. 6 to 8.

To carry out a cleaning operation of the chimney inner wall 11 and the ropes and / or chains 4 is assumed from the operating position shown in FIGS. 1 to 3. In this, the ropes and / or chains 4 are stretched. By operating the actuator 10, starting from this operating position, one of the suspensions, in the illustrated embodiment, the second or lower suspension 3, against the other suspension, in the illustrated embodiment, the upper or first suspension 2, rotated in a second operating position. The angle of rotation is favorably at least 45 °, preferably at least 90 °. But it can also be lower or higher. By twisting the two suspensions 2 and 3 against each other and the ropes or chains 4 are rotated about the common longitudinal central axis 8. Starting from this second Betriebsstell.ung the reverse rotation of the suspension takes place. This should happen as quickly as possible. For this purpose, the lower suspension can be easily released by a corresponding freewheel in the actuator 10. However, it is also conceivable that the actuating device 21 actively turns back the corresponding suspension 2 or 3. By this reverse rotation, in any case, the ropes and / or chains 4 are put into a swinging motion, in which the cables and / or chains 4 on the chimney inner wall 11 strip along by the centrifugal forces during swing through the zero crossing and clean them from the deposited dust or soot. At the same time, of course, dust or soot deposited on the ropes and / or chains 4 is also removed. The freed dust and soot particles fall into the ash box 20. For the sake of completeness, it is pointed out that the ropes and / or chains 4 of course also already offset by a correspondingly fast rotation of the suspension from the first to the second operating position in the mentioned oscillatory motion can be.

A positive side effect of the cables or chains 4 is that they additionally reduce the flow velocity at the chimney inner wall 11 with respect to a flow profile of a chimney 1 without chains or ropes, which further facilitates the separation of dust particles. In addition, the cables and / or chains 4 support by their shape the formation of local inhomogeneities of the electric field, which further facilitates the attachment of dust and / or soot particles.

In order to compensate for length tolerances of the cables and / or chains, not shown here springs or individual weights in the chain suspension can be provided. The ropes and / or chains (4) are characterized by means of elastic Vorspannele- * · * · ♦ · ·· ···· ♦ · · · · · · · · · · · · · · · · · · · · ··· .. This also prevents sagging of the individual cables and / or chains 4 and their deflection due to electric field forces. Conveniently, moreover, in preferred embodiments, it is provided that the cables and / or chains 4 are attached to at least one of, preferably to all, suspensions 2, 3 by means of non-destructively releasable connection devices, preferably carabiners or hooks or screw connections.

6 (top view) and FIG. 7 (side view) show a first alternative to the above-described type of actuator 10. Here, the frame 7 of the second suspension 3 selected here by way of example is rotated by means of a motor 23 and in this example mounted in the drive housing 25, gear 24 is rotated. For this purpose, the toothed wheel 24 engages in the intermediate spaces between the pins 26 fastened to the frame 7 or to the second suspension 3. By turning the gear 24 and the guided in the bearings 27 rotatably within the chimney 1, the second suspension 3 is rotated. As a result, in Figs. 6 and 7, not shown, attached to the second suspension ropes and / or chains 4 are rotated. The turning back can also be done actively by means of motor 23. Alternatively, a freewheel of the gear 24 may be provided. Then the turning back takes place by means of gravity. In any case, the above-described cleaning effect is achieved in all variants by turning and / or turning back.

Fig. 8 shows a further alternative of how the actuator 10 may be formed. It should first be noted that while the rope 9 is mounted or attached to the second suspension 3 as in the embodiment shown in FIGS. 1 to 3 and led out through the opening 19 of the chimney 1. In contrast to FIGS. 1 to 3, however, the cable 9 is then guided via a guide roller 28 through two cable guides 33 to a handle 36. For biasing or tightening the rope 9, a weight 35 may be provided. By means of the handle 36 is a manual operation possible, as already described above. For motorized and thus automatable drive but here again a motor 23 for rotating the revolving chain 31 is provided. The chain 31 is guided over the drive sprocket 29 and the Umlenkkettenrad 30 and has a, by rotating the chain 31 rotating cam 32. This engages, if it is in the appropriate position, in the cable clamp 34 and pulls them with a corresponding direction of rotation of the chain 31 together with rope 9 down, which in turn the suspension 3 is rotated, which leads to twisting of the ropes or chains 4. In the vicinity of Umlenkkettenrades 30 rope clamp 34 and driver 32 are disengaged. By acting on the second suspension 3 and the ropes or chains 4 gravity these are then when the rope 9 is thus released again, turned back, which again takes place the described cleaning process.

Finally, it should be pointed out that cleaning devices according to the invention can be used in various types of chimneys 1, that is to say not only those with electrical charging of the dust and soot particles.

Key to the reference numbers: 1 chimney 32 driver 2 first suspension 33 cable guide 3 second suspension 34 cable clamp 4 chain 35 weight 5 passage opening 36 handle 6 frame 7 frame 8 common longitudinal central axis 9 cable pull 10 operating device 11 chimney inner wall 12 chimney longitudinal axis 13 first electrode 14 voltage source 15 grounding 16 Flue gas inlet nozzle 17 Cyclone 18 Insulator 19 Opening 20 Ash boxes 21 Fixing point 22 Drum 23 Motor 24 Gear 25 Drive housing 26 Pin 27 Slide bearing 28 Guide roller 29 Drive sprocket 30 Guide sprocket 31 Circumferential chain

Claims (15)

Patent Attorneys HefelScHofmann 22287/34 / ir 090209 European Patent Attorneys Dipl.-Ing. Herbert Hefel (until 2006) Mag. A cleaning device for a chimney (1), characterized in that the cleaning device comprises a first suspension (2) and at least a second suspension (3) and at least one actuating device and the suspensions (2, 3) are interconnected by means of cables and / or chains (4) extending between them and at least one, preferably the second, of the suspensions (2, 3) of the actuating device (10) against the other, preferably the first one , the suspensions (2, 3) is rotatable. 2. Cleaning device according to claim 1, characterized in that the first and / or second suspension (2, 3) around a central passage opening (5) around a substantially circumferentially closed, preferably substantially annular or tubular frame (6, 7) have (have) or form (form). 3. Cleaning device according to claim 2, characterized in that in at least one of the suspensions (2, 3) the ropes and / or chains (4) in the circumferential direction over the entire frame (6, 7), preferably equidistant, are distributed to this attached , 4. Cleaning device according to claim 2 or 3, characterized in that in an operating position in which the ropes and / or chains (4) are stretched, two adjacent ropes and / or chains (4) spaced from each other on the frame (6, 7) at least one of the suspensions (2, 3) are mounted. 5. Cleaning device according to one of claims 2 to 4, characterized in that the one of the suspensions (2, 3) against the other of the suspensions (6, 7) about a common longitudinal central axis (8) of the suspensions (2, 3) rotatable around is. 6. Cleaning device according to one of claims 1 to 5, characterized in that the one of the suspensions (2, 3) of the actuating device (10) by at least 45 °, preferably by at least 90 °, against the other of the suspensions (2, 3 ) is rotatable. 7. Cleaning device according to one of claims 1 to 6, characterized in that the actuating device (10) at least one, on at least one of the suspensions (2, 3), preferably on the second suspension (3), tangential to the circumferential direction attacking, gear (24) or movable element, bank details Österreichische Postsparkasse Account No. 92.111.622, bank code 60000 Swift code: OPSKATWW IBAN: AT55 6000 0000 9211 1622 Sparkasse der Stadt Feldkirch Account no. 0400-006300, bank code 20604 Swift code: SPFKAT2B IBAN : AT70 2060 4004 0000 6300 T +43 (0) 5522 73 137 F +43 (0) 5522 73 359 M office@vpat.at I www.vpat.at VATATU 64196033 ·· ·· m * • · • • • « Preferably pull-wire (9) or hydraulically or pneumatically operated slide, or at least pressurizing a compressed air source to tangentially to its circumferential direction and / or or rotating at least one of the suspensions (2, 3). 8. Cleaning device according to one of claims 1 to 7, characterized in that the cables and / or chains (4) by means of non-destructively releasable connection means, preferably carabiners or hooks or fittings, on at least one of, preferably at all, suspensions (2, 3 ) are attached and / or the cables and / or chains (4) by means of elastic biasing elements, preferably by means of springs, are biased. 9. chimney (1) with a cleaning device according to one of claims 1 to 8, characterized in that inside the chimney (1) the first suspension (2) on the second suspension (3) is fixed and the second suspension (3) by means the ropes and / or chains (4), preferably free of the actuating device (10) free, on the first suspension (2) depends. 10. chimney (1) according to claim 9, characterized in that the chimney (9) has a chimney inner wall (11), and the ropes and / or chains (4) in an operating position in which the ropes and / or chains (4 ), less than 5 cm, preferably less than 3 cm, are spaced from the respective nearest region of the chimney inner wall (11). 11. chimney (1) according to claim 9 or 10, characterized in that the chimney (1) with respect to a chimney longitudinal axis (12) symmetrical chimney inner wall (11), and one of the suspensions (2, 3), preferably the second suspension (3), against the other of the suspensions (2, 3), preferably the first suspension (2), around the chimney longitudinal axis (12) is rotatable around. 12. Fireplace (1) according to one of claims 9 to 11, characterized in that a longitudinal extension of the cleaning device, preferably the cables and / or chains (4), in an operating position in which the cables and / or chains (4) stretched are at least a 5 times the largest inside diameter of the chimney (1). 13. Fireplace according to one of claims 9 to 12, characterized in that within the chimney (1) a first electrode (13) is arranged and the cleaning device, preferably the ropes and / or chains (4), and / or a chimney inner wall ( 11) of the chimney (1) forms or has a second electrode, wherein a voltage source (14) is provided, with which a voltage between the electrodes can be applied. 14. Fireplace according to claim 13, characterized in that the chimney has a relative to a chimney longitudinal axis (12) symmetrical chimney inner wall (11), and the first electrode (13) as an at least partially along the chimney longitudinal axis (12) extending wire, preferably barbed wire, is trained. 15. A method for operating a cleaning device according to one of claims 1 to 8, in particular in a chimney (1) according to one of claims 9 to 14, characterized in that at least one, preferably the second, of the suspensions (2, 3) of the Actuating device (10) starting from a first operating position against the other, preferably the first, the suspensions (2, 3) is rotated to a second operating position and then one of the suspensions (2, 3) is rotated back into the first operating position, wherein at least one twisting of the suspensions (2, 3) the cables and / or chains (4) are vibrated, preferably along each other and / or on the chimney inner wall (11) along strip.