EP0618847B1 - Process and device for acoustically irradiating and transferring vibrations to an acoustic irradiation fluid containing particles - Google Patents

Abstract

In the process of the invention for generating vibrations and their transfer to an acoustic irradiation fluid (11), the sound waves are generated by an acoustic probe (2) with an acoustic converter (6) and a resonator (3) attached thereto. According to the invention, the resonator (3) is surrounded by a compartment wall (9) and the space (7) between the resonator (3) and the wall (9) is filled with a transfer fluid (15) which transfers the vibrations from the surface of the resonator (3) to the irradiation fluid (11) surrounding the wall (9). The resonator (3) may be actuated regardless of the damping properties of the irradiation fluid (11) and the particles therein to be acoustically irradiated.

Description

The invention relates to a method and a device for sonication and for transmitting vibrations to a sonication liquid containing particles according to one of Claims 1, 7 and 21.

For many years, ultrasonic cleaning systems have been used for cleaning the surfaces of jewelry, but also machine parts, which consist of a container containing a cleaning liquid, an ultrasonic generator and one or more sound transducers, which are attached to the outside of the container walls and vibrate move and transfer the vibrations to the liquid.

It was recognized early on as a disadvantage that the sound transducers are poorly adaptable to the load, which is composed of the container, the cleaning liquid or the coupling medium and the objects immersed therein for cleaning. The physical conditions, such as the working frequency, the transmission behavior of the container, the damping of the coupling fluid and the material to be cleaned, also set limits to the dimensions of the cleaning systems.

From EP-B1-0044800 it is known that a typical piezoelectric Sound transducer for a working frequency of 20 kHz has a length of approx. 100 mm and a lateral dimension of approx. 65 mm. Such a transducer can only radiate 2 to 6% of the energy to the coupling medium; the rest causes heat in the transducer, which has to be dissipated and / or only allows short switch-on times. From the cited document it is also known that another factor stands in the way of a good adaptation of the load to the coupling liquid and the objects to be cleaned immersed therein. The sound power radiated per unit area cannot be increased arbitrarily, because the cavitation partially decouples the sound transducer from the coupling fluid. These findings have resulted in a large number of sound transducers having to be installed on the tank bottoms in larger cleaning systems. This leads to high investments and correspondingly high operating costs. Despite this improvement, when sonicating a suspension into which a large number of particles to be treated have been introduced, it is insufficient to introduce the sound energy required for cleaning these particles into the suspension, since the attenuation caused by these particles greatly reduces the propagation of the sound waves or prevented.

A measuring instrument for measuring the characteristics of liquids (US-A-3,680,841) is also known from the European search report. A sonication device immersed in a container filled with liquid is intended to prevent precipitation from forming on the areas of measuring electrodes immersed in the liquid. To protect against the aggressiveness of the liquid to be characterized, eg acid, is encased in the transducer. In order to transmit the vibrations of the vibrator consisting of an electrical sound transducer to the protective sheath surrounding it, a liquid is filled in the latter. This protective jacket acts as a resonator and transmits the ultrasound waves directly to the liquid to be measured. According to the US specification, it should be possible with the vibrator to prevent deposits on the two electrodes with low energy, so that, for example, the quality of a pH measurement can always be constant, even if the liquid is partially crystallized. Since the sound transducer is surrounded by a jacket, it can be used directly in hot and corrosive liquids and cooled by the liquid. The liquid, for example, to be measured for its pH value, contains no suspended particles to be cleaned, which have a dampening effect on the propagation of the sound waves. Problems with starting the vibrator in this application or maintaining its operation do not occur in this application. It is not possible to use the probe known from US-A-3,680,841 for the sonication of attenuation-rich sonication media.

The use of the pipe vibrator known from EP-B1-0044800 for the sonication of powder, granular or other-shaped products suspended in the coupling liquid and contaminated with deposits has not proven to be possible if the percentage of products to be cleaned is related to the amount of Coupling fluid exceeds certain limits. In most cases it succeeds at all not to vibrate the resonator within the liquid, since the damping of the coupling liquid together with the products to be cleaned contained therein is too great. A substantial reduction in the percentage of the product to be cleaned in the liquid in order to reduce the damping is not desirable for reasons of productivity and cost. For this reason, no systems for large-scale sonication of free-flowing bulk goods, such as blasting media, foundry sand etc., have been put into practice to date.

This problem is clearly known from FR-PS-1.212.496. There, an attempt is made to expose only a small amount of material to be sonicated to the sound waves of a sonic device in a very small sonication container. Since the detached contaminants are lighter, but the cleaned particles are heavier than the sonication liquid, they are separated naturally and no additional devices or influences are required. In addition to the very low possible output of such a system, it cannot be used, for example, for cleaning abrasives in which, for example, corundum and heavy metal contaminants have to be separated. The same problems also occur when cleaning foundry sand.
EP-A-0 528 070 (publication date: February 24, 1993) discloses a process for the treatment of bulk goods, in which the contamination of the foundry sand is to be removed with ultrasound. Tests have shown, however, that even an economically uninteresting small one Concentration of bulk material in the sonication liquid the sound probe can no longer be started.

It has also been shown that perfect detachment alone does not allow the expected clear separation of the components because the deposits tend to stick again.

The object of the present invention is to provide a method and a device for generating sound waves and for removing particles present in a sound reinforcement from their adhering deposits or impurities.

This object is achieved by a method and a device according to the features of claims 1, 7 and 21.

Surprisingly, with the method and the device according to the invention, the sound probe or the resonator, despite energy loss due to the additional transmission media, which prevent the contact of the resonator with the sonication liquid and the particles to be cleaned therein, is essentially independent of the damping properties of the particles and of the particle-containing sonication and coupling fluid. The compartment wall used to separate the transmission medium is set in motion by the sound waves emitted by the resonator and transmits them to the particles to be sonicated.

When using a resonator with a surface structure, the vibrations will decrease sent from the resonator crossing each other in all directions. In the case of a resonator with elevations in the form of rods, humps, etc., the vibrations are also emitted to the sound reinforcement in all directions, so that the sound waves can cross in the sound reinforcement medium and thus also hit the particles to be sounded from all sides.

If a compartment wall permeable to the coupling liquid is used, there is no need for an additional transmission liquid, and the sonication energy is introduced directly from the resonator into the sonication liquid located between the resonator and the compartment wall but not loaded with particles and forming a protective flow or jacket.

Figur 1

einen Längsschnitt durch eine Beschallungsvorrichtung mit einer mantelförmigen Abteilwand in einem Beschallungsbehälter,

Figur 2

einen Längsschnitt durch eine Beschallungsvorrichtung mit einer beutelförmigen Abteilwand,

Figur 3

einen Längsschnitt durch eine Beschallungsvorrichtung mit einer gewellten Abteilwand,

Figur 4

einen Längsschnitt durch eine Beschallungsvorrichtung mit einer mit Erhebungen versehenen Abteilwand,

Figur 5

einen Längsschnitt durch eine Beschallungsvorrichtung mit einem rohrförmigen Resonator und einer darin eingesetzten Abteilwand,

Figur 6

einen Längsschnitt durch eine Beschallungsvorrichtung mit einem durch eine strömende Übertragungsflüssigkeit erzeugten Mantel,

Figur 7

einen Längsschnitt durch eine Beschallungsvorrichtung mit einer Abteilwand und einem als Aufstromklassierer ausgebildeten Behälter (teilweise als Halbschnitt dargestellt),

Figur 8

einen Längsschnitt durch eine Beschallungsvorrichtung mit einem die Sonde umfassenden, doppelwandigen flüssigkeitsdurchlässigen Rohr (teilweise als Halbschnitt dargestellt),

Figur 9

einen Längsschnitt durch eine Beschallungsvorrichtung gemäss Figur 8 ohne eine den Resonator und die Beschallungsflüssigkeit trennende Abteilwand (teilweise als Halbschnitt dargestellt),

Figur 10

einen Längsschnitt durch eine Beschallungsvorrichtung mit einer rohr- und schraubenlinienförmig ausgebildeten Abteilwand und mit einer Zentrifuge,

Figur 11

einen Längsschnitt durch eine Beschallungsvorrichtung mit einer rohr- und schraubenlinienförmig ausgebildeten Abteilwand in eine Aufstromklassiervorrichtung eingesetzt.

The invention is described below with reference to illustrated embodiments. Show it:

Figure 1

2 shows a longitudinal section through a sound system with a jacket-shaped compartment wall in a sound container,

Figure 2

2 shows a longitudinal section through a sound system with a bag-shaped compartment wall,

Figure 3

2 shows a longitudinal section through a sound system with a corrugated compartment wall,

Figure 4

2 shows a longitudinal section through a sound system with a compartment wall provided with elevations,

Figure 5

a longitudinal section through a sound system with a tubular Resonator and a compartment wall inserted therein,

Figure 6

2 shows a longitudinal section through a sound system with a jacket produced by a flowing transmission fluid,

Figure 7

2 shows a longitudinal section through a sound system with a compartment wall and a container designed as an upflow classifier (partially shown as a half section),

Figure 8

2 shows a longitudinal section through a sound system with a double-walled, liquid-permeable tube (partially shown as a half-section),

Figure 9

8 shows a longitudinal section through a public address device according to FIG. 8 without a compartment wall separating the resonator and the public address liquid (partially shown as a half section),

Figure 10

2 shows a longitudinal section through a sound system with a tubular and helical compartment wall and with a centrifuge,

Figure 11

a longitudinal section through a sound system with a tubular and helical compartment wall in an upstream classification device.

The public address device 1 according to the invention has a hollow or solid resonator 3 with a diameter d of, for example, 48.5 mm, which is connected to a sound transducer 6, which is shown only schematically in FIG. The sound transducer 6 is arranged outside the resonator 3, which is of tubular design here, and connected to the latter at the end face. A magnetostrictive or a piezoelectric sound transducer 6 can be attached. The sound probe, designated as a whole by 2, is connected at its one end, which contains the sound transducer 6, to the wall 8 of a sound container 10 via flange 13. The resonator 3 can also have a shape other than a tubular geometric shape. The sound transducer 6 is supplied with energy by a sound generator 16, which is likewise arranged outside the resonator 3 and the sound container 10, via the line 12.

In the first example, a jacket-shaped compartment wall 9 surrounds the resonator 3 to form a space 7. The compartment wall 9, with the resonator 3 arranged therein, is immersed in a sonication liquid 11 to be sonicated. The compartment wall 9, the diameter D of which is, for example, 85 mm, is at least partially vibration-connected to the resonator 3 via a transmission medium or a transmission liquid 15 located in the space between the surface of the resonator 3 and the inner surface of the compartment wall 9. The space 7 between the resonator 3 and the compartment wall 9 can thus be completely or partially filled with the transmission liquid 15, which transmits the vibrations initially transmitted from the resonator 3 to the transmission liquid 15 to the sonication liquid 11 and the particles 32 introduced therein and the deposits sitting thereon 34 transmits (only a few shown in Figures 1 and 2).
The compartment wall 9 can be used for indirect transmission be a closed vibratory body or a perforated body for direct transmission; it can also be designed in the form of a net or lattice or as a textile fabric and allow the passage of transmission liquid 15 or sonication liquid 11 into the intermediate space 7 or in the opposite direction without being loaded with particles to be sonicated and damped.

It is also possible to design only the bottom 18 of the compartment wall 9 to be liquid-permeable.

The compartment wall 9 consequently serves to create a low-damping zone between the resonator 3 and the sonication liquid 11 with the parts 32 contained therein.

In the case of a liquid-tight compartment wall 9, water can be used as the low-damping transmission liquid 15 for the transmission of the vibrations generated at the resonator 3 to the compartment wall 9. The jacket-shaped compartment wall 9 can be made, for example, of metal, glass or plastic, the natural resonance behavior of which is preferably adapted to the desired sonication frequencies.
In the case of a liquid-permeable compartment wall 9, this acts as a sieve and the liquid present between the resonator 3 and the compartment wall 9 is in this case identical to the sonication liquid 11. The transmission of the vibrations from the resonator 3 to the particles to be sonicated now takes place in this embodiment of the invention directly through the particle-free sonication liquid 11 in contact with the resonator 3 and to a lesser extent also through the compartment wall 9. The vibratory compartment wall 9, which acts as a sound or vibration transmitter, can have a structured surface (FIG. 3). This enables the sound waves to be emitted in mutually intersecting directions. In a further embodiment of the invention according to FIG. 4, elevations or thorn-shaped or rod-shaped attachments 21 can be attached to the surface of the compartment wall, which also allow a confused radiation of the sound waves.

In the embodiment of the invention according to FIG. 2, the compartment wall 9 can alternatively have the shape of a bag consisting of a film or mesh in order to separate the transmission liquid 15 from the sonication liquid 11. The bag 17 can also be attached to the end of a compartment wall 9 which extends only over a partial length of the resonator 3.

In a second embodiment of the probe 102, the resonator 103 can be designed as a hollow body, in which the compartment wall 109 is inserted, forming an intermediate space 107 for the transmission liquid 115.

In the simplest embodiment according to FIG. 5, both the resonator 103 and the compartment wall 109 used in it are tubular. The sonication liquid 111 with the particles 132 to be sonicated is then located within the compartment wall 109, which can be set in motion by the transmission liquid 115. Direct contact between the surface of resonator 103 and the Sonication fluid 111 in the space 107 and the particles 132 therein does not take place. With this embodiment, a greater sound wave density is achieved in the sonication liquid 111. A liquid-tight or a liquid-permeable compartment wall 109 can also be used here.

In a third embodiment of the invention according to FIG. 6, a liquid jacket which largely prevents direct contact of the particles 232 in the sonication liquid 211 with the resonator 203 can be generated by a correspondingly guided introduction of transmission liquid 215 (shown as a helix) or particle-free sonication liquid. Instead of the helical course of the flow of the transmission liquid 215 shown schematically in FIG. 6, a flow of the transmission medium 215 running parallel to the longitudinal axis of the resonator 203 could also be generated (cf. also the embodiment according to FIG. 9).

In FIG. 7, the resonator 303 is arranged in a compartment wall 309 which is spherical in the lower region 324 and which is in contact with the resonator 303 through the transmission liquid 315. Outside of the cylindrical upper section 326 of the compartment wall 309, a guide wall 328 is arranged parallel to the latter, the lower end 330 of which ends at a distance from the spherical section 324 with the formation of a gap X. The container 310, in which the resonator 303 of the acoustic probe 302 is immersed, has a cylindrical configuration in the upper section. The contour of the container runs in the region of the spherical section 324 of the compartment wall 309 310 in sections approximately parallel to the spherical section 324. The spherical section 324 can be arranged independently of the compartment wall 309 below this (no illustration). The container 310 ends in a line 312 below.
The combination of the described features forms an upflow classifier in which particles 332 of different sizes and / or formed, which are suspended in the sonication liquid 311 and have been released by the sound probe 302, can be separated and removed separately. The separation is carried out as described below. In the separating space 318 between the compartment wall 309 and the guide wall 328, particles 332 loaded with deposits are introduced into the sonication liquid 311 and sink downward under their own weight. As they pass the path downwards, they are sonicated by sound waves from the sound probe 302, and the deposits 334 are detached from the particles 332, ie liberated. They remain in this released state, since the spherical section 324 is also caused to vibrate by the sound probe 302 and therefore also transmits these vibrations in the region under the guide wall 328 to the sound reinforcement liquid 311. As soon as the particles 332 and the detached deposits 334 leave the annular area between the compartment wall 309 and the guide wall 328, the detached deposits 334, the size of which is generally smaller than the size of the particles 332, get into a flow (arrow P), which is generated by a liquid that is admitted through line 312. The detached and released deposits 311 are moved upward in the annular channel between the guide wall 328 and the wall of the container 310 by the flow P. transported and can be removed there (arrow Q). The heavier particles 332, which have been freed of the deposits 324, come down due to their own weight against the upward flow P and can leave the container 310 and be removed through the line 312.

In the fourth embodiment of the invention according to FIG. 8, the compartment wall 409 encloses the resonator 403 as in the example according to FIG. 1. In the container 410 there is a treatment room 418 which is delimited by two liquid-permeable wall surfaces 428,446. The lower end of the inner wall 428 of the treatment room 418 is connected to a floor 438; the outer wall 446 is connected to the bottom of the container 410. The container 410 is connected to a line 412 at the bottom via a valve 440. The outer wall 446 is further connected at the bottom to a feed line 442 and at the top a drain line 444 for rinsing liquid.
Liberating and separating contaminated particles 432 and deposits 434 is described below. Contaminated particles 432 are introduced into the annular space of the treatment space 418 and sink downward in the sonication liquid 411 and are sonicated at the same time. The detached liberated deposits 434 are rinsed out by a liquid flow (arrows R) which is introduced between the compartment wall 409 and the inner wall 428 of the treatment room 418 and through the treatment room 436 and can be rinsed there by a further liquid flow (arrows S) above or below, if the flushing takes place in the opposite direction, can be removed from the container 410. The cleaned particles 432 leave the container 410 through line 412. Contaminated particles with a very low density, for example shredded, contaminated styrofoam or the like, are introduced from below and removed from the container 410 from above.
The dwell time of the particles 432 to be cleaned can be controlled with the flow velocity in the line 412.
Batch operation can take place by closing the treatment room 436 - below and / or above.

In the fifth embodiment of the invention according to FIG. 9, the compartment wall 509 is formed by the inner wall of the treatment room 518. Otherwise, the design of the device (resonator 503, container 510) and the functioning of the cleaning of the particles 532 are identical to those in the fourth exemplary embodiment.

In the fifth embodiment of the invention according to FIGS. 10 and 11, the compartment wall 609 is designed as a tube and wraps around the resonator 603 in a helical manner. Both the helical compartment wall 609 and the resonator 603 are immersed in the transmission liquid 615, which is filled in a container 610. In the interior of the tubular compartment wall is the sonication liquid 611 with the parts 632 loaded with deposits 634.
In FIG. 10, the sonication liquid 611 with the deposits 634 detached during the passage is passed into a separation device, in the present example into a centrifuge 650. Deposits 634 and sonication liquid 611 are separated from the particles 632 in the centrifuge 650. The particles 632 can be, for example, kieselguhr particles from beer filtration from which deposits 634 of yeast, protein and the like have been removed in the device. In the device according to FIG. 11, at the end of the helical sound path, the particles 632 are separated from the detached contaminants 634 in an upflow classification process. The cleaned, mostly large particles 632, for example foundry sand, sink in the container 610 and leave it at its lower end. A rinsing liquid is introduced from below, which transports the detached particles 634 upwards, where they can also leave the container 610.

The term transmission fluid used in the description is understood to mean a fluid which essentially contains no or only a small number of low-mass particles and consequently counteracts the propagation of the sound waves with little damping.

The sonication liquid can be used to support the cleaning effect and the removal of the deposits, e.g. Lye.

The transmission liquid can be identical or different from the sonication liquid.

The sound probe can e.g. an ultrasonic probe RS-20 available from Telsonic AG CH-9552 Bronschhofen or a similar product.

Both the rigid and the bag-shaped compartment wall can only extend over part or the entire height of the sound container.

Claims (21)

1. Process and device for acoustically irradiating and for transferring vibrations to an acoustic irradiation fluid containing particles for separating impurities from particles introduced into the acoustic irradiation fluid by means of an acoustic irradiation device with a sound generator, an acoustic converter (6) and connected thereto a resonator excited by the acoustic converter, characterised in that the sound waves generated by the resonator (3, 103, 203, 303, 403, 503, 603) are firstly transferred to a transfer fluid (15, 115, 215, 315, 415, 515, 615) low in damping action in direct contact with a resonator (3, 103, 203, 303, 403, 503, 603), and is conducted further by said fluid and transmitted directly or indirectly to the acoustic irradiation fluid (11, 211, 31, 411, 511, 611) and the particles (32, 132, 232, 332, 432, 532, 632) to be acoustically irradiated inserted into the acoustic irradiation fluid (11, 211, 31, 411, 511, 611), so that deposits (34, 134, 234, 334, 434, 534, 634) on the particles (32, 132, 232, 332, 432, 532, 632) are separated and are held in liberated form.
2. Method according to claim 1, characterised in that the vibrations generated by the acoustic converter (6) and transmitted by the resonator (3, 103, 203, 303, 403, 503, 603) are transferred to the transfer fluid (15, 115, 215, 315, 415, 615), and in that the vibrations are transmitted by the transfer fluid (15, 115, 215, 315, 415, 615) via a compartment wall (9, 109, 309, 409, 509, 609) or through the latter to the acoustic irradiation fluid (11, 111, 211, 311, 411, 511, 611) and the particles (32, 132, 232, 332, 432, 532, 632) submerged therein for acoustic irradiation.
3. Method according to claim 2, characterised in that a fluid-permeable compartment wall (9, 17, 109, 509, 609) is used and a particle-free or low-particle acoustic irradiation fluid (11, 111, 511, 611) is used as a transfer fluid (15, 115, 515, 615).
4. Method according to claim 2, characterised in that acoustic irradiation is effected through a compartment wall (9, 109, 309, 409, 509, 609) which is fluid-tight over its entirety or over a portion of its length.
5. Method according to claim 1, characterised in that the transfer fluid (215) or particle-free acoustic irradiation fluid form a protective flow (R), and prevent direct contact between the particles (232, 432, 532) to be acoustically irradiated and/or the acoustically irradiation fluid and the resonator (203, 403, 503).
6. Method according to one of claims 2, 4 and 5, characterised in that the compartment wall (609) surrounds the acoustic irradiation fluid (111, 611) at least in the region of the transfer fluid (115, 615).
7. Device for generation and transfer of vibrations to an acoustic irradiation fluid in an irradiation container (310), with an acoustic probe (2), with at least one acoustic converter (6) and a resonator connected to said acoustic converter and capable of being vibrated by the latter, characterised in that at least a portion of the surface of the resonator (3, 103, 303, 403, 503, 603), intended to transmit the vibrations to the particles (32, 132, 232, 332, 432, 532, 632) submerged in the acoustic irradiation fluid (11, 111, 211, 311, 411, 511, 611) to be irradiated, is separated by a compartment wall (9, 109, 309, 409, 509, 609) from the particles to be irradiated, a lower-damping transfer fluid (15, 115, 215, 315, 415, 515, 615) being present between the surface of the resonator (3, 103, 303, 403, 503, 603) and the compartment wall.
8. Device according to claim 7, characterised in that the surface of the compartment wall (9) is structured, or in that raised portions or broad-shaped vibratory members (21) are attached to the compartment wall (9).
9. Device according to one of claims 7 or 8, characterised in that at least a portion of the compartment wall (9, 109, 309, 409, 509, 609) is tubular in shape, or in that the compartment wall (9, 109, 309, 409, 509, 609) has perforations, and is in the form of a bag or a grid, net or textile structure.
10. Device according to one of claims 7 to 9, characterised in that the compartment wall (9, 109, 309, 409, 509, 609) extends over a portion of, or the entire height of, the irradiation container (10, 110, 210, 310, 410, 510, 610).
11. Device according to one of claims 7 to 10, characterised in that a protective flow (R) is present between the surface of the resonator (3, 103, 203, 403, 503) and the acoustic irradiation fluid (15, 115, 215, 415) with the contained particles (32, 232, 432, 532).
12. Device according to one of claims 7 to 11, characterised in that the compartment wall (9, 409, 509) surrounds the resonator (3, 303, 403, 503), or in that the compartment wall (109) is inserted within the tubular resonator (103).
13. Device according to one of claims 7 to 10, characterised in that there is inserted between the compartment wall (309) and the wall of the container (310) forming two annular spaces, a guide wall (328) which terminates at a distance above the lower end of the compartment wall (309), and in that means (312) for introducing a fluid are disposed on the container (310).
14. Device according to claim 13, characterised in that the lower end (324) of the compartment wall (309) has a thickened portion, or is spherical in shape, and in that a slot (S) is present between the lower end (330) of the guide wall (328).
15. Device according to one of claims 7 to 12, characterised in that there is inserted between the compartment wall (409) and the wall of the container (410) a fluid-permeable treatment chamber (418) through which a fluid (415) may wash.
16. Device according to claim 15, characterised in that the treatment chamber (418) is open at the top and bottom for on-line operation, or may be closed at the bottom and/or at the top for batch operation, and is designed and intended to accommodate particles (432) for cleaning introduced from the top or from the bottom.
17. Device according to claim 16, characterised in that the region between the external wall of the treatment chamber (418) and the wall of the container (410) is so formed that it may be rinsed through.
18. Device according to one of claims 15 to 17, characterised in that the compartment wall simultaneously forms the internal wall of the treatment chamber (436).
19. Device according to claim 7, characterised in that the compartment wall (609) is in the shape of a spirally-extending hollow member at least partly surrounding the resonator (603) or lying within a resonator (603) and submerged in the transfer fluid (615).
20. Device according to claim 19, characterised in that the lower end of the compartment wall (609) which is in the form of a hollow member, opens into a separating device (650).
21. Device for generating and transmitting vibrations to a particle-charged acoustic irradiation fluid, with an acoustic probe (2) with at least one acoustic converter (6) and with a resonator (203) connected to the acoustic converter and capable of being vibrated by the latter, characterised in that means are provided for introducing a low-damping-action transfer fluid in order to form a fluid jacket (216) around the resonator (203).

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