DE1699813U - ARRANGEMENT TO PREVENT CAVITATION DURING THE SOUNDING OF LIQUIDS. - Google Patents

Description

Siemens-Sehuekertwerke _: \ _ß Erlangen ,, - the 25th SfP

M 9/140/928:

IA 53/170? ν ^: ^

Registration day: ^ ' ^! ''"''' Act ^ Ec ^ S

Logged in as; Patent UoUffiH

Editor Fomhof _: Inventor - Dr, HoIf Ische

Abbot ο / works TB 45

Ko: sten ^: wears? ¹ SS 45 also applies to i ■ TS 42 '1

Title extension; Coupling liquid at the same time flowing coolant

flüesigfeeito V ':

Arrangement for the "prevention of cavitation in the

The invention relates to an arrangement ... for dumping liquids with the highest possible intensity "_;:;'_;; _:

It is known that the sonication of liquids with ultrasonic vibrators - magnetostrictive or piezoelectric ₈ preferably ceramic - after a certain period of operation leads to cavitation phenomena on the radiating Schwingerfläohe: -..... ο The cavitation reduces the intensity of the ab- '.: ... radiated sound vibrationsc The maximum achievable acoustic power is also limited by the increasing warming at higher loads,. ;; : ^; ; _; '" ^K

The invention has the task of eliminating these drawbacks, According to the invention, in an arrangement for sonicating liquids by means of a pressurized coupling fluid between the ultrasonic generator and a partition wall that is permeable to _{sound, 2pB 0 is} a sonication vessel wall; " the Eopplungsflüssigkeit cooling liquid is preferably continuously over passed over the vibrator surface simultaneously »: Bs is indeed already known, a pressurized Eopplungsflüs-: sigkeit to use" However, it has not detected _{s that:} with a little extra effort, a substantial increase in the Efficiency can be achieved _o 'The transfer of the cooling liquid over the transducer surface sets the heating of the

-1- Tf / Fs ■■

gers substantially reduced nnä can thus a higher load without "must be dispensed with the FORTEIL the higher security g ^ gen lavitation ■ ^{_0::;: i;} ■

Way to increase the efficiency, is: in development of the invention is that a non- "■ '■ .. conductive coupling liquid is used, the Bohwinger: ■ at least also au £" the Hüßfes ei te uiigibt'o>^{f:; ::} ■ ';. ■; : ;

According to the invention can in the device according to the invention * a; : Another advantage can also be achieved with the appropriate training that the sum of the distance between the land äer transducer surface ₅ doho, i.e. the height of the liquid and the; found-strength is measured in such a way that it is c \ / 4 or _o - an odd-numbered v ^; corresponds to integer multiples of λ / 4 _o This adaptation ^ - a so-called λ / 4 transformation - also brings a -: substantial improvement of the degree of effectiveness of the arrangement with it ο; _: .: ":: ■ '■■ .." ■■ ", ■■ ^; - ■

Using the drawing, an exemplary embodiment of an arrangement according to the invention is explained, for example; - _;

Ir the I ¹ Ig ₀ 1 of the piezoelectric vibrator 1 is mounted is a wall 2 "in the bottom 5 of the vibrator opposite is the ^Se: a sound-transmitting plate 5 is arranged sound reinforcement vessel 4 made of cavitation material that is approximately the same Sröße as the free transducer surface and whose thickness is kept very small compared to the wavelength _o In principle, however, it is possible to increase the wall thickness to a thickness η ■ '■ „„ J ^ _

■ - · ^:: 2 ■ ■:

hold, where η = 0,1,2 * "" is. On the other side of the Schmingger is, in a manner known per se, an SSJ. Air-filled reflection box 6 arranged in the space between the /■".■ ': oscillator 1 and the bottom 3 or »· the disk 5, a coupling fluid is arranged under pressure, which preferably continuously passes through the arrangement and advantageously not into one The cooling device shown is continuously recooled «The Vf distance h and the wall thickness d of the disk 5 are advantageously ^: dimensioned so that their sum is equal to (2n + 1)» A / 4, where η is equal to UuIl or an integer? approximated

PA 52 / T7ÖT '""<".' ■ '■ *

an acoustic 'λ / 4 transformation received ₀ "-;" i

Di ©? Igo 2: shows a further embodiment of an arrangement according to the invention using a magnetostriction; Oscillator 11 _o The magneto-restriction oscillator 11 is arranged with the interposition of an elastic body 12, for example a SchwaffiiBgummilcQrpers, on the bottom of the cooling pressure vessel 15, which is attached to an echo-durometer wall 15 of the treatment vessel «. The pressure vessel i ^ fc is provided with lohratut £ en 16 and 17 for the passage of the cooling liquid. With this arrangement, too, the occurrence of cavitation is prevented and the transducer itself is cooled during its operation ₉ so that the maximum achievable acoustic power of the Schwingers can be increased kano "_; :: -: ■ ^;

The possible embodiments of the arrangement moh of the invention are not exhausted by the examples described _. the treatment vessel wall formed via the coupling fluid and: e incipient speaking.-on the subject to be treated; acts «""- / ■ ΐ ^^ ί ' ¹ -'.- ^."'"-,"'''- ¹ -.''^-'- ¹

2 figures - '■' ^{■■■■:;} ^ v ^::: ^ - 1 ■■■■ '"

5 claims. :: -'f, -. : "■ -. ^:; ' : -Y : ■■■'_"'i ^:

Claims (4)

1 «- arrangement * tt» sound tob. Talking about one under Bruclc Standing coupling elements wipe the “Ultras challerseuger” and “Ultras challerseuger a sound-permeable part, e.g. a wall daauroh gelcean indicates that a "non-conductive coupling fluid" lceit is coolant at the same time, the gate pulling device is constant is passed over the transducer surface and that the transducer «Umindeat also on the back tone of the liquid is surrounded. Arrangement according to Attepsnioli. 1 or 2, characterized in that the wall thickness of the acoustically permeable wall very small compared to it « file length A, £ «t». 3 · Arrangement according to claim 1 or 2, characterized in that UiB Waai # tl3? & · D »? ei ^ M ^ UUiv <d ^ Uie «i§ni W« md m # A * .. is » 4. Arrangement according to one of the preceding claims, characterized in that the sum of the wall thickness of the achalldurohläige wall and the distance between the sound-permeable wall and the upper surface of the oscillator approximates & mt 2 η + 1. / t / 4 matched iet. n / w » 5 * 4 * 1999