LU82873A1 - APPARATUS FOR THE TREATMENT OF SURFACES WITH A PRESSURIZED LIQUID - Google Patents

Description

LU 1722

—-— / ”3 GRAND-DUCHY OF LUXEMBOURG

Patent No ............................................... ...

from ------------ October 20, 1980 $ BB Mr. Minister of National Economy and the Middle Classes

Title issued ......................................... Industrial Property Service

- ~ n LUXEMBOURG

QA h - 5.0 y Breyet's request for invention I. Request î La- "€ GREMME]> u ~ <î © OPERATïVE DE SECHERCSES AND DIFFUSIONS" MEDICÂI £ S "'AND ---------- ------- {1) M! NÏÂlRES7 ^ 1 ”8th“ 'deiff "' ÜMiBS '' 'ÏÎWcfiës ^ a5000'" llSiroR '' '"(BëTgîqüë)' .......... .................................................. ..

repTÊSïaiïÆë ^ ïY ^ WiWfll7 "'Zëwèiiï7 ^^“ ConsHT'1ën “préropHlEifë' ^ 3HïstrieTIeV" 'acting-inquiry-requestdemandataixe ---------------------------------- ---------------------------------------------------------- ------------------------------ - d ^ ose— ce ...... twenty october WôO quâtrè-vinëEs ^ f at ......... D..5OQ ........ hours, at the Ministry of National Economy and the Middle Classes, in Luxembourg:. 1. the present request for obtaining a patent of invention concerning: MAppareil "^ our" ^^ "^ TeitBfflein:" "de" "S'ïnrfiïC'ô“ "â" T '^ dë' ^^ lffi ^ rcîîïî3 ^ '1§ôiiïs ~ pifëiB ¥ îôiή declares, assuming responsibility for this declaration, that the inventor (s) is (are): Mï ..... LouisUETAILLE ..... .................................................. .................................................. .................................................. .................................................. ............ (5)

Chaussée - dE "Dxnatïf-119 .......................................... .................................................. .................................................. .................................................. ..............

B — 5150 · -HEPîOîî (Belgium) ......................................... .................................................. .................................................. .................................................. ........

2. the delegation of power, dated ..... Brussels ................................. on - 18 octôbre l980 - 3. description in French ............ ............................ ........... of 1, invention 611 two copies; 4 ..................... £ ........ drawing boards, in two copies; 5. the receipt of taxes paid to the Luxembourg Registration Office, ............. 20 Octabre "1980 ---------------- ---------------------------------------------------------- ---------------------------------------------------------- ---------------------------------------------------------- --------------------------------- claims for the above patent application the priority of one (of) application ( s) of (6) ............................................ ..f .............................................. filed ® in (7) ---------- y ---------------------------------- ---------------------------------------------------------- -------------------- the ............................. .................................................. .................................. y --------------- ---------------------------------------------------------- ---------------------------------------------------------- ---------------------- (8) ......................... .................................................. ............................................ 7- ---------------------------------------------------------- ---------------------------------------------------------- ---------------------------------------------------------- -- on behalf of ............................................. .......................................... y .------ ---------------------------------------------------------- ---------------------------------------------------------- -------------------------- (9) elect domicile for him (her) and, if designated, for his representative, in Luxembourg _____________________________________ 4pptacœ " ”WiiïS ^ nÂCfiWchÎ'K'i ~ 'XiiïœnÎË ^ fg ------------------------------------- ---------------------------------------------------------- ------------------------------- {10) ”requests the issuance of a patent for the invention described and represented in the abovementioned appendices, - with postponement of this issue to ..................... jg -------------- -----month.

, 4 The ..... agent ......................................... ...

^ B - IL Minutes of Filing

The above application for a patent for invention has been filed with the Ministry of National Economy and Clisses Moyennes, Industrial Property Service in Luxembourg, on: 1980- * fjt Pr. Le Ml iistre at 4.00 a.m. f 8 / * §11 National Economy and Medium Classes, ...... ~ "'15 ........ U il v ./ \ 1 i Al / 1 V # y

| j 14026/26029 DB / MT

: f | LU 1722 it; i i Γ! I.

DESCRIPTIVE MEMORY: filed in support of a request for

! PATENT

I® on behalf of the "COREDIMED" COOPERATIVE FOR MEDICAL AND DENTAL RESEARCH AND DISSEMINATION "i for: i" Apparatus for the treatment of surfaces using a liquid under pressure "

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The present invention relates to an apparatus for treating surfaces, cavities! or of parts using a liquid subjected at the same time to periodic variations of pressure of low frequency and large amplitude and to periodic variations of pressure of higher frequency and of lower amplitude comprising a reservoir containing the liquid * treatment, a distributor intended to be applied on a surface or part to be treated or at the entrance to a ca-M quickly and a pipe connecting said reservoir to said distributor.

The treatment liquid contains at least one active treatment agent, such as a medical treatment agent or an industrial treatment agent ί dissolved or suspended. The current of the treatment liquid is intended to supply the distri-! stopper which can be an injector or similar member l i to be mounted on a part or part to be treated, î for example a part of the human body, an industrial part I to be treated, etc.

! i The apparatus comprises means for; subjecting the flow of process liquid flowing in the supply pipe to periodic variations in pressure of low frequency and high amplitude and to periodic variations of pressure of higher frequency and lower amplitude.

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In particular, the apparatus can be used for cleaning dental cavities, for removing undesirable substances from dental canals, for cleaning wounds, for treating solid surfaces or textile materials, as well as for all; other purposes where it is a question of treating generally any surfaces or cavities by means of a liquid under pressure, this liquid being able to contain solid particles, such as particles of abrasive, or bubbles of a gas.

In known devices of the type indicated above, several independent units are provided; a dantes to apply the desired pressures to the treatment liquid ί ·, between the supply container of | this liquid and the place where the treatment liquid; | must be used. These imitates are arranged in; separate enclosures and are connected to each other by several sections of the supply pipe.

j

The known devices mentioned above have some drawbacks.

The units forming the device require a large space for their assembly. In addition, before each treatment, the imitations and the sections of the supply pipe must often be cleaned or sanitized, because the treatment liquid is in contact with the mechanical parts of these units and with the successive sections of the supply pipe. food.

These cleaning or sanitizing treatments are generally long and costly.

The subject of the present invention is

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i »j a new device which makes it possible to avoid the abovementioned disadvantages I v.

I ^ ί In accordance with the present invention, the device I comprises a single-use compressible hose

S

| removably connected, on the one hand, to the aforementioned tank!

he

1 - 3 - fl and, on the other hand, to the aforementioned distributor, the first means intended to act on the compressible hose of ma-! means of subjecting the liquid to increases in pressure therein alternating with decreases in pressure '$ i | so that the liquid thus undergoes varia-! pressure of high amplitude and low frequency, as well as second means for acting on the compressible hose so as to subject the liquid thereto to periodic variations in pressure of lower amplitude and higher frequency , said first and second means act on the compressible hose ['by crushing it „

According to a particular feature of the invention, the first aforementioned means are made up! by a controlled rotary feeder pump

Ipar a motor provided with adjustment means for varying the speed of the pump cyclically, these adjustment means being advantageously arranged to make | turn the feed pump successively and alternately at a first adjustable speed for an adjustable time, then at a second adjustable speed lower than the first adjustable speed, also for an adjustable time.

As for the second means intended to subject the treatment liquid in the supply pipe to periodic pressure variations; ^ of higher frequency and less amplitude, they are advantageously constituted by a hammer controlled so as to crush the flexible pipe on a stop at frequencies and for adjustable times.

- 4 - 1 The apparatus according to the invention j advantageously comprises suction means acting on a second compressible pipe connected to the distributor for the evacuation of the treatment liquid from this distributor, the second compressible pipe being able to be connected to the container or supply tank to allow recycling of the liquid from! , treatment or be connected to a drainage point.

| In a first particular embodiment of the invention, the apparatus comprises a fixed assembly containing the means intended to act on the compressible single-use supply pipe jj to subject the treatment liquid to variations j pressure periodicals of low frequency and of large amplitude and with variations of pressure of higher, frequency and of lower amplitude, as well as interchangeable supports of compressible pipes which can be adapted to the above-mentioned fixed assembly, each support ij compressible containing a flexible hose of determined internal diameter, j In a second particular embodiment of the device according to the invention, it comprises j - me fixed part, - a movable part intended to be adapted i * on the part fixed ij ^ - a container of treatment liquid placed in the corresponding cavity of the fixed part, l - me rotary feed pump provided with at least one roller roaming freely around his

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i I own axis and mounted on a rotary plate or arm fixed to a main rotation shaft carried by the aforementioned movable part, the roller rotating around the main shaft y ji in a recess in said movable part and I in a recess semi-cylindrical formed in the part

Ifix above, - drive means for rotating * the main shaft of the rotary feed pump, Î- means for subjecting the treatment liquid displaced by the feed pump to a ~ periodic pressure variations of low frequency and of high amplitude, an oscillator arranged downstream of the means 1 serving to subject the treatment liquid to periodic variations in pressure of low frequency and i of high amplitude, relative to the pump power supply, these oscillators comprising a hammer or other means capable of transmitting pressure variations of! i; higher frequency and lower amplitude audit i! liquid and being carried by the fixed part, - several successive grooves or grooves to wedge a compressible supply pipe, formed in the fixed part and extending from the liquid reservoir, to the supply pump, then i * ·! up to the means for applying variations of; pressure of low frequency and of high amplitude to the liquid and to the oscillator, one end of the supply pipe being immersed in the container of liquid, this pipe pressing against the wall of the semi-recess i 4 i] cylinder of the feed pump, of! so as to be subjected to the action of the roller thereof, the supply pipe then passing through the means intended to subject the liquid to periodic variations in pressure of low frequency and high ampli-I tude and passing finally in the vicinity of the i.

I stroke of the hammer or other means of the oscillator, | Λ in order to be thus submitted by this hammer or these others! means to periodic variations in pressure of fre-! - higher frequency and lower amplitude, | - the flow of liquid periodically | extract from the supply tank by the roller (s) j of the supply pump being subjected, in the pipe! supply, to the action of the means intended to subject it to periodic variations in pressure of low frequency and high amplitude and then being !! led through the oscillator, in which these pressure variations are combined with periodic pressure variations of higher frequency and lower amplitude.

The compact device thus comprises the means necessary to circulate a predetermined current of a treatment liquid and to subject it to the desired pressure and speed variations. Furthermore, the new device uses a 1 "supply pipe. removable or disposable, which has the same internal diameter between the supply container r and the point of use. Consequently, it suffices to replace the supply hose between two successive treatments, without you have to clean or wash * ||

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the mechanical parts of the device.

When the appliance has a hose | hose or elastic and flexible recycling hose | ble to bring back A part or all of the treatment liquid from the point of use to the supply container, this new device also includes; * - an evacuation pump provided with at least one roller rotating around its own axis and mounted on a rotary plate or arm fixed to the main rotation shaft carried by the above-mentioned movable part, this roller rotating around this shaft in one . recess of this movable part and in a semi-cylindrical recess

Ique corresponding to the above-mentioned fixed part, - drive means for turning the rotary evacuation or recycling pump, - several grooves to bind the pipe! recycling, arranged in the fixed part and extending upstream of the evacuation pump and between this i J pump and the liquid container, in which 1 '

AT

The inner end of this recycling hose dips.

'1 I The mobile and fixed parts can i be connected to each other by various means of connection. Thus, the movable part can be articulated, for example by means of hinges, to the fixed part, so that i can pivot relative to the latter.

I * - In addition, the mobile part can be mounted on the! ^ fixed part by means of a pair of double parallelo- I grams articulated so that they can be moved I constantly parallel to this fixed part. The movable part i can also be moved along vertical guide rods carried by the fixed part.

As a safety measure, the mobile part of the device according to the invention is locked to the fixed part in the closed position of the device. With regard to the pumps of the device constituting the second embodiment. x of the invention, the recess of the movable part and the recess of the fixed part of the feed pump I or the discharge pump can both be semi! 1 cylindrical and diametrically opposed. Furthermore, the feed pump and the optional discharge pump can comprise several rollers arranged in a regular manner around the main shaft and serving to compress the feed pipe successively * * or the possible evacuation pipe, against the wall | t rigid recess in the fixed part · j To rotate the two pumps in synchronism, I the motor of the supply pump is the same as J that of the evacuation pump and the two pumps can be mounted on the same main shaft. The pumps

The supply and disposal are advantageously identical. The drive motor and the transmission means of the feed pump and of the possible discharge pump can also be carried by the fixed part of the apparatus. To vary the: flow rate of the treatment liquid passing through the feed pump or the discharge pump, the latter may include means for adjusting the length I of the contact between the roller or each roller and the supply pipe or the recycling hose. In an embodiment particularly suitable for facilitating the manufacture of the fixed and mobile parts of the apparatus, the feed and discharge pumps both have the same casing or the same casing and have the same recess in the mobile part. and the same recess in the fixed part, so that the supply pipe is applied against the rigid wall of the semi-cylindrical recess of the fixed part. The discharge pipe is then applied against the rigid wall of the semi-cylindrical recess provided in the movable part of the device. The two pipes are subjected to the action of the rollers driven by the single main rotation shaft.

The means for applying periodic variations of pressure of low frequency and of high amplitude to the treatment liquid may comprise a hermetically sealed accumulation chamber, disposed downstream of the feed pump relative to the liquid reservoir and constituted by a recess provided in the movable part and by a recess provided in the fixed part of the apparatus, das sealing or sealing means being provided at the entry and exit of this accumulation chamber, around the pipe d 'food. In this case, means are provided for connecting the accumulator chamber; ; lation to a device capable of transmitting pressure variations to it acting on the drive means of the feed pump, this device being carried by the fixed part of the device *

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In order to ensure easy cooperation of the accumulation chamber with the supply pump of the device, this accumulation chamber is connected to a pressure regulator, such as a pressure switch electrically connected to the motor of this pump. 'food.

The means intended to subject the treatment liquid to periodic pressure variations of low frequency and of high amplitude, can also act on the speed of the feed pump, controlled by a variable speed drive, so that an increase pressure of the process liquid is caused by an acceleration of the speed of the feed pump, while a decrease in pressure is caused by a decrease in this speed.

The hammer of the oscillator used to subject the liquid to small variations in pressure acts on the supply pipe on the side opposite to a fixed stop of the lower block, stop in contact with which extends the supply pipe. . In addition, this hammer extends perpendicular to the supply pipe through an opening. formed in a fixed support of the fixed part of the device, on which it is actuated elastically by a cam, against a return spring.

1 'The supply hose and the drain hose used in the device may have different shapes. These supply and eva-DD pipes can have a single section or several dd | sections connected successively to each other, jj between the supply tank and the distributor or 11 i * S f I injector. Sn general, the supply pipe has i an interior passage of constant section, while h the wall of this supply pipe is thinner in its sections extending in the supply pump, in the accumulation chamber and in the oscillator. In order for the supply pipe to be compressible in its section extending in the supply pump and more expandable in its extending section in the accumulation chamber, the sections of this supply pipe extending in the feed pump and in the accumulation chamber can be made of a more flexible material than that of the remaining sections of this feed pipe. For the same purpose, the supply pipe can consist of a single tube formed of silicone surrounded by a thin tube '' of polyvinyl chloride in its section extending in the supply pump and in the chamber. accumulation, while said silicone tube is surrounded by a large polyvinyl chloride tube in its sections extending in the wedging grooves. Likewise, the supply pipe may consist of a silicone tube surrounded by a sleeve formed of braided nylon threads along its sections extending outside the accumulation chamber and outside the pump. power supply. In general, the drain hose has a constant internal passage section. Like the supply hose, the evacuation hose can consist of a silicone tube surrounded by a polyvinyl chloride tube in its sections extending outside the evacuation pump.

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I or a silicone tube surrounded by a sleeve of | nylon braided in its sections extending outside | of the recycling pump. The supply I and discharge pipes can be continuous and be made of the same material, while having the same internal diameter over their entire length.

î. To avoid losses of treatment liquid between the fixed and mobile parts of the apparatus according to the invention, the liquid container or reservoir is closed at its upper part by a hermetic lid having an opening for the passage of the supply pipe. and any recycling pipe 1.

Other features of the new * device according to the invention will emerge from the following description of several embodiments; of this apparatus, this description being made with reference to the appended drawings in which: - Figure 1 is a schematic view of an apparatus according to the present invention; - Figure 2 is an elevational view of a first embodiment of the apparatus according to the invention; - Figure 3 is an elevational view of a compressible single-use and interchangeable hose support, adaptable to a fixed assembly of the apparatus according to the invention; - Figure 4 is a vertical section of a second embodiment of the apparatus according to the invention in the open position; - Figure 5 is a section similar to that of Figure 4 showing the apparatus in the closed position;

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I - Figure 6 is a plan view of the fixed part of 1 ’| apparatus according to Figures 4 and 5, some parts, 4 of the movable part being shown; | - Figure 7 is a schematic section of the feed ij pump or the appliance discharge pump according to Figures 4 to 6; * - Figure 8 is a schematic section of the accumulation chamber of the device according to Figures 4 to 7 î - Figure 9 is a schematic view of a first embodiment of 1 * oscillator of the device according Figures 4 to 8; - Figure 10 is a schematic section of a second embodiment of the oscillator used in the device according to Figures 4 to 8; - Figure 11 is a schematic section of a shape

Ide realization of the feed and discharge pumps both enclosed in the same casing of the device according to Figures 4 and 5; - Figure 12 is a section perpendicular to that of Figure 11; - Figure 13 is a schematic section of a third embodiment of the feed and discharge pumps of the device according to Figures 4 and 5, whose rotation shafts are collinear; - Figure 14 being a section perpendicular to that | * of Figure 13; I - Figure 15 is a longitudinal section of a supply pipe i * usable in an apparatus according to the invention; - Figure 16 is a section of a recycling pipe i usable in the apparatus according to the invention; - Figure 17 is a longitudinal section of another embodiment of this pipe; - Figure 18 is also a longitudinal section of another example of such a pipe, and i I - Figure 19 is a graph showing the variations! s of pressure to which the treatment liquid is j subjected in the compressible supply hose of the device distributor.

In these different figures, the same reference notations designate elements l j. identical.

The apparatus according to the invention is used to circulate a treatment liquid I between a supply tank and a point of use, first passing through a compressible supply hose 1 for single use, then optionally j through a compressible recycling pipe 2, also j for single use, this apparatus being arranged to subject j! the treatment liquid circulating in the supply hose! j tation 1 to periodic pressure variations of low frequency and high amplitude and to periodic pressure variations of higher frequency and lower amplitude. The mechanical means which the device comprises and which act on the treatment liquid do not come into contact with this liquid conveyed in the pipe I between the supply tank and the point of use, nor with the liquid. recycled through pipe 2 I into said tank-

In the apparatus according to the invention,! the treatment liquid may consist of a solution suitable for cleaning teeth, in particular for removing undesirable substances or materials from the dental canals. However, the device can also be used to treat other parts of the human body with another liquid from! treatment containing at least one treatment agent I * in solution or in suspension. The device can also be used for industrial purposes, for example for stripping surfaces, for coating surfaces, etc.

The apparatus according to the invention | essentially comprises, as shown in FIGS. 1 jj and 2, a container or supply tank 6 containing a reserve of a treatment liquid, a distributor 53 for this liquid serving to bring the liquid i possibly charged with solid particles, such t | as abrasive particles and / or bubbles of a gas,! such as air or nitrogen, on a surface or part to be treated. The feed container 6 is connected to the distributor 53 by the flexible feed pipe 1 which is connected therein in a removable or inter-

Ichangeable. In other words, the same device allows the use of compressible hoses 1 having different internal diameters, according to the type of treatment liquid to be used and according to the desired flow rate of this liquid.

Between the supply tank 6 and the distributor 53, the compressible hose 1 is subjected to the action of first means locally submitting

Ad! \> this pipe to deformations or crushing aimed at subjecting the liquid to increases in pressure alternating with decreases in pressure ^ so that this liquid undergoes periodic variations in pressure of high amplitude and low frequency, as well as the action of second means also subjecting the pipe 1 to deformations or crushing intended to subject the treatment liquid to periodic pressure variations of lower amplitude and higher frequency. Thanks to the aforementioned means which are illustrated in the remainder of this specification, “the treatment liquid undergoes pressure variations such as those illustrated in FIG. 19 of the attached drawings 2, in which the pressures in kg / cm v are indicated on the ordinate and time in seconds on the abscissa. This figure reveals, on the one hand, increases in pressure alternating with decreases

Pressure amplitudes of large amplitude and low frequency, with superimposed variations of pressure of low amplitude and high frequency.

The first aforementioned means are constituted, as shown in Figures 1 and 2, by a feed pump 9 comprising a housing 70 in which can rotate an arm 69, the ends of which carry rotating rollers 15, the arm 67 being bonded in its center on a shaft 43, driven in rotation by a motor 16 on which acts a regulating device 71 of the known type making it possible to rotate the motor alternately at a first relatively high speed for a given time, then at a second "- 17 -! (: -ÿ j ;. ·· | '......

I also lower speed for a given time, so as to subject the liquid passing through the pump to alternating increases in pressure and 5 | pressure drops of great amplitude and * low frequency, the rollers 15 crushing the compressible pipe 1 against the wall of the casing 70 of the pump 9 during the rotation of the arm 67 thereof.

Downstream of the feed pump 9, the treatment liquid conveyed in the compressible pipe 1 is subjected to the action of a hammer or the like 38 subjecting the pipe 1 to rapid shocks or percussions ij, this pipe thus being crushed at least partially- i \ ment between the hammer 33 and a stop 36> such i \ fmj so that the liquid is subjected to variations of.

pressure of lower amplitude, but of higher frequency than in pump S. The hammer 38 can be actuated by a regulating device 7k such as an electromagnet or by a cam carried by the shaft of a motor.

The liquid thus treated is brought to the dispenser 53 which may consist of a nozzle of substantially cylindrical shape which brings the treated liquid into contact with a surface or part to be treated or even in a cavity to be treated. The distributor 53 is connected to an equally compressible recycling pipe 2 which passes through a roller suction pump 58 analogous or identical to the feed pump, this pump 58 subjected to the action of a motor 16 itself subjected to a speed regulator I - 18 - f 71 creating an aspiration of the treated liquid so as to extract it from the distributor 53, after it has acted on the surface or part to be treated and to send it either to the container or supply tank 6, either in a recovery tank 75 or to evacuate it.

Figure 5 of the accompanying drawings shows schematically a cassette or support 76 adaptable to an apparatus of the type shown in Figure 2. This cassette contains a reservoir of treatment liquid 6, "for example a bulb connected to a section of compressible pipe 1 arranged so as to form a loop 77 making it possible to adapt it to a feed pump j 9 between the arm carrying the rollers thereof and the casing of the pump. Each cassette can contain a compressible hose of determined internal diameter, so that one can, using a set of cassettes, use one or the other of these with the same device. In each cassette, a tap I or a valve 78 can be provided to allow the liquid 'contained in the reservoir 6 to be extracted therefrom by the supply pump 9 of the apparatus in the compressible hose 1. This tap can be opened automatically when the cassette is placed on the device. In each cassette 76 the compressible hose! j 1 is guided downstream of the tank 6, so as to be placed, by its loop 77, when it is fitted on the '-! i ‘1‘ 1 ‘» · ..... J. t * r-: λ 'v _ ^ ^ pump 9, in the desired position so that the rollers | i of this pump can act on this pipe 1, the latter then being guided by a guide 84 to be housed between the hammer 38 and its stop 36. Downstream of this location, the cassette contains a section of pipe 1 guided at 85, the free end of which ends at 79 outside the cassette.

A connector 80 can be provided at this location allowing the connection of a section of compressible pipe 1 of sufficient length to reach a distributor 53 to which this last section of compressible pipe must be connected. The cassette can also include a suction pipe 2, the inlet 81 of which is also provided with a connector 82 for connecting a section of: - suction pipe 2 of desired length connected to the distributor 53. On its path to the inside the cassette 76, the suction pipe 2 guided by guides 84 forms a loop 82 allowing it to be placed in the casing of the recycling or evacuation pump. At its outlet 83 from the cassette 76 the suction pipe 2 is also provided with a connector 84 enabling it to be connected to another section of discharge or recycling pipe 2 of desired length, either for recycling the liquid in the supply container 6, either for the recovery of this liquid in a collecting container, or for the evacuation of this liquid.

*

In the center of the loops 77 and 82, the cassette 76 has a centering pin 86, these pins .86 being able to be engaged in corresponding holes of the axes of the shafts of the pumps 9 and 58. In this way, the setting! placing cassettes on the unit is easy.

In the cassette 76 can be provided lon-; compressors tubes which can be extracted by "simple pulling out of the cassette to be connected! at the place of use to a nozzle applicable on a surface or part to be treated or at the entrance of a cavity to 1 treat.

The device illustrated in FIGS. 4 to 11 basically comprises two superimposable blocks, namely a lower fixed block 3 and an upper block! removable or mobile 4. In one embodiment of this device according to the invention, the upper block 4 is articulated to the lower block 3 by means of lateral hinges - | the 5, so that this block 4 can pivot relative

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j to the fixed block 3 · In other possible embodiments ij, the upper block 4 can be moved parallel to the lower block 3, being mounted laterally! on a pair of double articulated parallelograms or I while being guided along perpendicular guide rods! to the lower block 3 · I In the closed position, the upper block 4 is arranged! ' on the lower block 3 and locking means are provided to keep the blocks assembled.

i | Blocks 3 and 4 form a set with the! : | means necessary to subject the treatment liquid J passing through the supply pipe 1 to the aforementioned double pressure variations.

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The treatment liquid is contained, initially, in the supply tank 6 disposed, in a tight manner, in a corresponding cavity 7 of the lower fixed block 3. The supply tank 6 is closed at its upper part by a cap or cover 8 having an opening for the passage of the supply pipe to be discarded 1 and another opening for the passage of the discharge or recycling pipe to be discarded 2. These two openings are closed in a sealed manner around the pipes 1 and 2.

In the supply tank 6, the pipe 1 extends almost to the bottom thereof, while the pipe 2 ends in the upper part of the. feed tank 6.

j I To get it to circulate in the supply pipe! 5 mentation 1 from the feed tank 6, the treatment liquid in this pipe 1 is subjected to the action of a rotary feed pump 9.

This rotary feed pump 9 comprises, in essence, a main rotation shaft 10 rotating in end bearings 11 and 12 carried by the upper block 4. Two circular plates 13 are wedged or fixed to the main shaft 10 and carry the pivots 14 of several rollers 15. The rollers 15 can rotate freely around the pins 14 and are! I distributed regularly around the horizontal axis of the main shaft 10. The number of rollers and their

H

l j diameter depend on the application of the device | and can be readily determined by those skilled in the art.

- 22 - 1 '1 ί The feed pump 9 is driven ij by an electric or pneumatic drive motor 16 carried by the lower fixed block 3. In the example 1 described, a helical pinion 17 is fixed to the rotation shaft 18 of the motor 16 and meshes with a pinion 19 of a transmission shaft 20 rotating in bearings 21 and 22 both carried by the upper removable block 4. Furthermore, a toothed wheel 23 fixed to the shaft transmission 20 meshes with a corresponding toothed wheel 24 fixed to the main shaft 10. Under these circumstances, the rotation of the motor 16 causes a corresponding and simultaneous rotation of the feed pump 9. The mobile mechanical elements of the | feed pump, in particular the rollers 13, are mounted in a casing which is delimited towards the i r! bottom by a cylindrical wall 25 of the lower fixed block * 3 and upwards by a cylindrical wall 26 of the upper removable block 4. The two walls 25 and 26 are diametrically opposite with respect to the horizontal axis of the main shaft 10.

When placed in the feed pump 9, the feed pipe 1 has its corresponding section which bears against the bottom wall. 25. However, the radial distance between the supply pipe 1 and the horizontal axis of the main shaft 10, is a little shorter than the radial distance between! "the outer parts of the rollers 15 and the same axis,

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j - 23 - 1 l so that the feed pipe 1 is compressed l by each roller 15, when it rotates in the envelope | feed pump lower cylinder 9.

! This makes it possible to subject the treatment liquid to i successive crushing in the supply pipe! 1, each time the rollers 15 are supported on the pipe 1 and compress it. In the embodiment described here, the different parts of the feed pump 9 are mounted on the upper removable block I 4, with the exception of the wall 25.

In other cases, the parts of the pump can be carried partially or completely by the lower fixed block 3.

[| Downstream of the feed pump 9, the j feed pipe 1 passes axially through an accumulation chamber 27 containing air. When blocks 3 and 4 are mounted one above the other, the accumulation chamber 27 is hermetically sealed and has a constant interior volume.

The accumulation chamber 27 is formed by two recesses 28 and 29 which can be cylindrical and have the same length. The lower recess 28 is provided in the upper face of the lower fixed block 3 and is delimited by a wall 30 of the latter, while

Ique the upper recess 29 is diametrically opposite the lower recess 28 and is provided in the lower face of the upper removable block 4, this recess - the upper 29 being delimited by a wall 31 of this upper block 4.

In the closed position of the two blocks 3 and 4, sealing means 32 and 33 are provided around the supply pipe 1, without causing the latter to be deformed.

!

The accumulation chamber 27 constantly communicates with a pressure regulator (pressure switch, piezoelectric quartz, etc.) 34 electrically connected to the electrical starting device of the engine 16,

The function of the accumulation chamber 27 is to regulate the pulses which must be transmitted to the treatment liquid circulating in the supply pipe 1. This adjustment takes place as follows.

Thanks to the feed pump 9, a stream of process liquid is periodically transported through the feed pipe 1 to its point of use.

Periodic pressure variations of low frequency and high amplitude are applied to the treatment liquid as follows: an increase in pressure takes place during the operation of the supply pump 9. When the desired maximum pressure has been reached, the supply pipe 1 is radially expanded in the accumulation chamber 27 and the air in this accumulation chamber 27 is compressed, so as to act on the pressure regulator 34 which then stops or slows down the motor 16 and lî: l - 25 - '.

i i; l

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feed pump 9. The pressure of the feed liquid downstream of the feed pump 9 I then decreases to a predetermined minimum value.

| The pressure of the air contained in the accumulation chamber; I 27 decreases at the same time and the pressure regulator j then acts, so as to start again or to accelerate the motor 16 and the supply pump 9.

; Under these conditions, the pressure of the treatment liquid is subjected to successive increases and decreases, so that the liquid is subjected to periodic variations in pressure of low frequency and high amplitude.

The pressure regulator 34 and the means for connecting it to the accumulation chamber 27 and to the engine. 16 are carried by the lower fixed block 3.

I At the outlet of the accumulation chamber 27, J the treatment liquid circulates in the supply pipe! ment 1, being subjected to periodic variations of low frequency pressure and high amplitude.

Downstream of the accumulation chamber 27, the treatment liquid is still subjected to pressure variations of high frequency and small amplitude.

To this end, the supply pipe 1 passes through a zone 33, in which it takes lateral support (against a fixed stop 36 of the lower block 3. The supply pipe 1 is subjected to the action of an oscillator!

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i%) 37 essentially comprising a hammer 38 subjecting the pipe 1 to rapid shocks or percussions. At the moment each shock is applied to the supply pipe 1 by the hammer 38, this pipe 1 is partially jj | _ crushed between the stop 36 and the head of this hammer 38.

jj All of the shocks cause the oscillations transmitted to the treatment liquid. The number of shocks applied in a predetermined time is much greater than the number of pulses produced by the feed pump. tation 9 and the accumulation chamber 27 at the same time, so that the frequency of the oscillations transmitted to the treatment liquid between the hammer j 38 and the stop 36 is much higher than that of the pulses which were previously transmitted to it 1 in pump 9.

I The oscillator 37 includes, to drive * 1; | alternatively hammer 38, an electric motor

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|| or pneumatic 39 carried by the lower block 3. An endless screw I 40 fixed to the rotation shaft 41 of the motor 39 meshes with a pinion 42 fixed to a transmission shaft 43 rotating in bearings 44 and 45. The shaft transmission 43 carries a cam 46 controlling the hammer 38. Thus, the hammer 38 is mounted on a fixed support 47 of the lower block 3. This support 47; has an opening 48 through which the hammer! 38 is moved back and forth,: opposite the supply pipe 1 and the stop 36.

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-27 - I

At its end opposite its head, the hammer 38 carries a terminal pivot 49 around which a roller 50 can freely rotate. Between its ends, the hammer 5 138 carries a transverse plate 51 against which. bears the end turn of a helical return spring 52, the other end turn of which bears against the support 47 around the opening 48.

f Thanks to the spring 52, the roller 50 of the hammer 38 follows | »Constantly the profile of the cam 46, so that the! shocks applied by this hammer 38 are determined by the profile and by the speed of this cam 46.

! It should be noted that the oscillator 37, as well as its hammer 38 and its drive means are entire! i ji ment supported by the lower fixed block 3.

: Downstream of oscillator 37, the liquid of | treatment flowing in the supply pipe 1 is simultaneously subjected., on the one hand, to periodic variations in pressure of high frequency and low amplitude and, on the other hand, to periodic variations! pressure of low frequency and high amplitude, i 4 l for the purpose of effectively treating a certain surface | conch.

I - The supply pipe 1 then leaves the device i and the outer end of this pipe 1 is connected to an injector or distributor 53.

The supply pipe 1 is wedged between the j upper removable block 3 and the lower fixed block 4, the i $! F - 28 - \ I "1 i when these blocks are fixed to each other. At this day! end, the length of the feed pipe 1 included i | between the supply tank 1 and the supply pump 9 is housed without play in a groove 54 l I formed in the upper part of the lower block 3.

In addition, the section of the supply pipe 1 included between the supply pump 9 and the accumulation chamber 27 is also mounted, practically without play, in a similar housing groove 53 in the upper part of the lower block 3. In addition, the section of the supply pipe 1 between the accumulation chamber 27 and the oscillator 37 is, similarly | '' way, housed, without play, in a housing groove 1 j: f similar 56 of the upper part of the lower block 3.

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Î Finally, the section of the supply pipe 1 extending downstream of the oscillator 37 is also housed, without i | î | clearance, in a corresponding groove 57 of the lower block I 3. When the upper block 4 is fixed to the lower fixed block I, the lower side of this upper block

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| 4 closes the grooves 54, 55 "56, 57 and the supply pipe 1 is effectively trapped there.

In the apparatus described above, the treatment liquid used, for example, for the treatment of a surface, is at least partially recycled by a recycling circuit extending from the injector or? £ distributor 53 to the feed container 6 i mounted in the lower block 3. In other cases, a l - 29 - ^ '.ί' 1 such recovery or recycling circuit is not provided jf , the liquid having served su treatment I can simply be discharged.

In order to be returned to the feed container 6, the treatment liquid passes through a recirculation pipe 2 and through a rotary recycling pump 5S which is analogous or identical to the feed pump 9.

The recycling pump 58 comprises a rotation shaft which constitutes the transmission shaft 20 to which two plates 59 are fixed. The plates 59 carry marginal pivots 60 which are regularly distributed around the horizontal axis of the shaft 20 $ I rollers 61 identical or similar to the rollers 15 are mounted so that they can rotate freely on the | pivots 60.

% ILhe housing 70 of the rotary recycling pump 58 is cylindrical and is delimited by two diametrically opposite recesses, the first being provided in the upper block 4 and the second in the lower block 3 · When it extends through the rotary recycling pump 58, the recycling pipe 2 is placed on the bottom of the lower recess.

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The recycling pump 58 most often rotates at constant speed or can operate like the feed pump 9 and the explanations given above concerning the feed pump 9 are applicable to

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the recycling pump 58.

The section of the recycling pipe 2 s * extending upstream of the recycling pump 58 is wedged in a fixed groove 62 on the upper side of the lower block 3, I while the section of the same recycling pipe 2 disposed between the recycling pump 58 and the feed container 6 is also stuck in a similar groove 63 in the upper part of the lower block 3 · Regarding the feed pipe 1! · And recycling hose 2, things happen! the same way, except that the feed pipe 1 passes through the accumulation chamber 27 and the zone 35 where the oscillator 37 is located.

Consequently, in the apparatus described, a current of a treatment liquid circulates through the supply pipe 1 under the action of the supply pump 9 which transmits pulses to it, | ! these impulses being regulated in the accumulation chamber I * I lation 27 and combined with oscillations before i ’; reach the surface or object to be treated.

Furthermore, a stream of treatment liquid is returned, after its use, by the recycling pipe 2 under the action of the recycling pump 58 which is arranged to apply a partial vacuum at the location of the dispenser or injector 53 acting on the surface to be treated.

l The supply pipe 1 preferably has a constant internal diameter over its entire length.

| However, the wall of the supply pipe 1 can be thicker in the grooves 54, 55, 56 and 57 in! which this pipe 1 is trapped, this wall possibly | be thinner in the section 64 located in the feed pump 9, so that the pipe is more compressible there, as in its section 65 located in the accumulation chamber 27, to be radially expandable there.

| The drain hose 2 also has, from | preferably, a constant interior section on all: | its length, but it can be thicker outside the recycling pump 58 than in its section 66, in the pump 58. It should be noted that the wall of the recycling pipe can have a thickness constant over its entire length, this thickness being arranged to allow correct operation of the pump of \\! " recycling 58.

I? || The feed pipe 1 and / or the drain pipe 2 may have a single section or.

several successive sections (see Figures 15 to 18). In the latter case, the sections 64 and 66 which are intended to be compressed can be made of polyethylene and the section 65 which must be expanded can be formed of silicone, the remaining sections can advantageously be made of polyvinyl chloride.

! - 52 - i - The supply pipe 1 and / or the discharge pipe 2 can consist of a single inner tube î i made of silicone and be surrounded, on the one hand, by a thin tube of polyvinyl chloride in the sections 64 and 66 extending respectively through the feed pump 9 and through the recycling pump 58, as well as through the storage chamber 27 and, on the other hand, by a tube thick, also made of polyvinyl chloride, in its sections extending into the wedging grooves. The supply pipe i and / or the recycling pipe 2 can i ί.

! consist of a single surrounded silicone tube; of a sleeve of nylon threads braided along their ', section extending outside the accumulation chamber and the corresponding pump.

ΐ | i “'An improvement of the feed pump 9 and the discharge pump 58 consists in adjusting and adjusting the length of contact between each roller 15 or 61 with the pipe 1 or 2. This is provided for in the framework of the present invention and can be achieved in an apparatus similar to that described above.

In a second embodiment (not shown) of the feed pump 9, the upper recess 26 provided in the upper block 4 is rectangular instead of being cylindrical. In this case, the supply pipe 1 bears against the wall 25 of the lower cylindrical recess, as in the I - 33 - i i i first embodiment. This other pump 19 can be used both as a feed pump and as a recycling pump.

In the third embodiment shown in FIGS. 11 and 12, the feed pump 9 and the discharge pump 58 have the same envelope delimited by two diametrically opposite recesses "made in blocks 5 and 4. In this case, three I rollers 15 are mounted at the ends of three arms | 68 each fixed to a common rotation shaft 10.

I. The feed pipe 1 bears against the wall I of the lower cylindrical recess, while the discharge pipe 2 bears against the ï. wall 26 of the 1 ’upper cylindrical recess | envelope.

In the fourth embodiment illustrated in FIGS. 13 and 14, the feed pump 9 and the discharge pump 58 have two coaxial envelopes connected to each other by a central free space. The rollers and the plate are identical, but separate for the pumps. The pebbles of the. feed pump 9 are arranged angularly i! | compared to those of the recycling pump 58, | as shown in figure 13. In addition, the pumps 9 '| and 58 are driven by two identical motors.

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In another embodiment of the oscillator 57 shown in FIG. 10, the cam 46 and the hammer 38 are replaced by two rollers 15 {î - 34 - \ j! carried by an angular arm 67, this arm 67 ′ i \ being able to rotate around the shaft 43.

\ For certain applications of the device a j according to the invention, it may be useful to admit ¥.

;! a gas, such as air or an inert gas, or | "Solid particles, in the stream of process liquid flowing through the feed pipe.

* f * To this end, the device according to the invention can be equipped with a valve, such as a solenoid valve 68.

* inserted into the supply pipe and connected by a pipe 69 to a source of gas or solid particles. By actuating this solenoid valve 68, it is possible) 'alternatively to admit a gas or solid particles and a treatment liquid into the supply pipe 1, the gas admitted into this pipe forming h j bubbles in the stream of treatment liquid.

The invention is obviously not limited to the embodiments and details described above by way of example. The accumulation chamber 27 and the pressure regulator 34 can be omitted, provided that the speed of the feed pump 9 is suitably modulated or modified, so as to cause an increase in pressure for a certain time, this increase being followed by a decrease in pressure during another time interval.

The increase in pressure is caused by an acceleration of the speed of the feed pump,! ’[I 6 'I;

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- DO - \? "! while the decrease in pressure is due to a decrease in the speed of this feed pump. To this end, the feed pump can be controlled by an electronic speed controller,; such as a "triactyoe" type drive which is itself controlled by a modulator.

In the embodiment of the apparatus according to the invention comprising an accumulation chamber and a pressure regulator, direct contact can be. between the supply hose itself and a micro-switch in the battery chamber! mulation itself, this microswitch acting I on the pressure switch or on a time relay.

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i! 3 "i i i? ί II *! 3 i- i i ”jj b il 'i - 36 -' i * i -i j Jj

Claims (38)

1 · Apparatus for the treatment of surfaces, cavities or parts using a liquid subjected at the same time to periodic variations of pressure of low frequency and large amplitude and to periodic variations of pressure of higher frequency and of lower amplitude comprising a, reservoir containing the treatment liquid, a distributor intended to be applied to a surface, at the inlet l | of a cavity or on a part to be treated and a pipe connecting it to said reservoir of said distributor, characterized in that i I comprises a compressible single-use pipe connected in a removable manner, on the one hand, to the abovementioned reservoir, and d *: on the other hand, to the aforementioned distributor, first means! intended to act on the compressible hose so as to subject the liquid to increases in pressure therewith with decreases in pressure, so that the liquid thus undergoes variations in pressure of high amplitude and of low frequency, thus as second means intended to act on the compressible pipe so as to subject the liquid thereto. periodic variations in pressure of lower amplitude and higher frequency, said first and second means acting on the compressible pipe by crushing it. h * l i "I 2. Apparatus according to claim 1, characterized in that the first aforementioned means I are constituted by a rotary feed pump with rollers controlled by a motor provided with adjustment means for cyclically varying the speed of 1 the pump. 3- Apparatus according to claim 2, characterized in that the said adjustment means are arranged to rotate the feed pump 'successively and alternately to a first. adjustable speed for an adjustable time, then at a second adjustable speed lower than the first! adjustable speed, also for an adjustable time. 4. Apparatus according to either of the preceding claims, characterized in that the second means I intended to act on the compressible hose; if they consist of a hammer controlled so as to $ | crush the flexible pipe on a stopper at frequencies I and for an adjustable time. 5. Apparatus according to claim 4,! I characterized in that the hammer is controlled by a cam carried by the shaft of an engine. 6. Apparatus according to claim 4, * characterized in that the hammer is controlled by an * electromagnet. ! I 7 · Apparatus according to one or the other of the preceding claims, characterized in that it J comprises suction means acting on an I -38- \! the second compressible hose connected to the distributor for the evacuation of the treatment liquid from this distributor. 8. Apparatus according to claim 7, characterized in that the suction means are constituted by a rotary roller pump. 9. Apparatus according to claim 7, i ‘. characterized in that the second compressible hose is connected to the supply tank, to allow i,! recycling of the treatment liquid. 10. Apparatus according to either of the preceding claims, characterized in that it comprises means for introducing into the treatment liquid solid particles and / or a gas. 11. Apparatus according to claim 10, I characterized in that the means for introducing solid particles and / or a gas into the treatment liquid consist of a solenoid valve connected, ij on the one hand, to the compressible pipe and, on the other hand, to a source of particles and / or to a source of gas, this solenoid valve being provided with a control making it possible to dose the quantity of particles and / or of gas to be introduced into the treatment liquid. 12. Apparatus according to either of the preceding claims, characterized in that it comprises a fixed assembly containing the means intended to act on the compressible supply pipe for i (subjecting the treatment liquid to variations 39. i 1 periodicals of pressure of low frequency and * of great amplitude and to pressure variations! Of higher frequency and of lower amplitude, as well as interchangeable supports of pipes: compressible which can be adapted on the set v fixed aforementioned, each compressible support containing a flexible hose of determined internal diameter. 13. Apparatus according to claim 12, characterized in that the compressed hose supports · * * also contain the supply tank Ien treatment liquid. 14. Apparatus according to claim 12, characterized in that the compressible pipe supports are in the form of cassettes provided with a device for commissioning the aforementioned means. 15. Apparatus according to claim 1, characterized in that it comprises: - a fixed part, - a movable part intended to be adapted on the fixed part, - a container of treatment liquid disposed in a corresponding cavity of the fixed part , - a rotary feed pump fitted with s * at least one roller freely rotating around its own axis and mounted on a rotary plate fixed to a main rotation shaft carried by the movable part j I above, the roller rotating around the main shaft ii I _ An _ lii * l in a recess in said movable part I and in a semi-cylindrical recess in the above fixed part, - drive means for rotating; 5 the main shaft of the rotary feed pump,; - means for subjecting the treatment liquid displaced by the feed pump to periodic variations in pressure of low frequency and high amplitude, i - an oscillator arranged downstream of the means I s used to subject the process liquid to periodic variations in pressure of low frequency and high amplitude, compared to the feed pump! Mention, this oscillator with a hammer! ! ; or other means capable of transmitting pressure variations of higher frequency and lower amplitude to said liquid and being carried by the fixed part, j: - several seccessives grooves for wedging a compressible supply pipe, formed in the fixed part and extending from the liquid reservoir, to the feed pump, then to the means for applying low frequency pressure variations and high amplitude to the liquid and the oscillator, a end of the feed pipe being immersed in the liquid container, this pipe resting against the wall of the semi-recess! 41. i j cylindrical lower of the feed pump,! ! so as to be subjected to the action of the roller thereof, i | the supply pipe then passing through the destinés means intended to subject the liquid to periodic variations j 1 of pressure of low frequency and of high amplitude and finally passing in the vicinity of the stroke of the hammer or other means of the oscillator, in order to be thus subjected by this hammer or this other means to periodic variations in pressure of higher frequency and of lower amplitude, i - the current of liquid periodically extracted 1 from the supply tank by the or the rollers of j; * the supply pump being subjected, in the pipe! supply, to the action of the means intended to subject it to periodic pressure variations of || low frequency and high amplitude and then being passed through the oscillator, in which these I pressure variations are combined with periodic pressure variations of higher frequency and lower amplitude. 16. Apparatus according to claim 15 »characterized in that the compressible supply hose is removable and replaceable. 17. Apparatus according to claim 15, characterized in that the supply pipe has the same smaller diameter between the supply container and the point of use. he ! - 42 - I; i <j; , ί i 18. Apparatus according to any one of claims 15 to 17, characterized in that it comprises a compressible discharge pipe for bringing back part or all of the liquid from it, treatment from the point of use to the container or at a disposal location. 19. Apparatus according to claim 18, characterized in that it comprises a discharge pump i. provided with at least one roller rotating around its j j j own axis and mounted on a rotary plate fixed to j the main rotation shaft carried by the movable part and in a corresponding semi-cylindrical recess of said fixed part,! - drive means to rotate [• J the rotary evacuation pump, - several grooves to wedge the pipe i '! I of evacuation, arranged in the above-mentioned fixed part | and extending upstream of the discharge pump and) a I between this pump and the liquid container, or 1 place of discharge. 20. Apparatus according to one or other of J j claims 15 to 19, characterized in that the; „The fixed part and the mobile part are connected to each other! the other, so as to allow them to be removed one! ! the other. |, 21. Apparatus according to claim 20, characterized in that the movable part is articulated,! ! : _ · Ζ. I for example by means of hinges, at the fixed part, so as to be able to pivot relative to this | last. 22. Apparatus according to claim 20, characterized in that the movable part is mounted on the fixed part by means of a pair of double articulated parallelograms so that it can be moved constantly parallel to this fixed part. * 23. Apparatus according to claim 20, characterized in that the movable part is movable along parallel guide rods carried by the fixed part. 24. Apparatus according to one or other of claims 15 to 23, characterized in that the - mobile part is locked to the fixed part in the closed position of the apparatus. 25. Apparatus according to either of claims 15 to 24, characterized in that the recess of the movable part and the recess of the fixed part * of the feed pump or the exhaust pump - - vacuation are both semi-cylindrical and diametrically opposite. 26. Device according to one of the other! "_ Claims 15 to 24, characterized in that the: feed pump and the optional discharge pump comprise several rollers arranged in a regular manner around the main shaft and - 44 - | i used to successively compress the supply pipe or any drainage pipe, against the rigid wall of the recess in the fixed part, 27. Apparatus according to either of claims 15 to 26, characterized in that the motor of the feed pump is the same as that of the discharge pump and the two pumps are mounted on the same shaft main. 28. Apparatus according to any one of claims 15 to 27, characterized in that the drive motor and the transmission means; the supply pump and the possible evacuation pump i are carried by the fixed part. 29. Apparatus according to either of claims 15 to 28, characterized in that the feed pump and the discharge pump comprise means for adjusting the length of the contact between the roller or each roller and the pipe. of food | or the drain hose. 5 30. Device according to either of | I claims 15 to 29, characterized in that the | 4 feed and discharge pumps all have £, two the same casing or the same casing and have Ψ-. ! the same recess in the movable part and the same I recess in the fixed part. 31. Device according to one of the other! claims 15 to 30 "characterized in that the Sj means for applying periodic variations of | pressure of low frequency and of high amplitude to the treatment liquid comprise a hermetically sealed accumulation chamber, disposed downstream of the feed pump with respect to the liquid reservoir and constituted by a recess provided in the mobile part and by a recess provided in the fixed part, sealing or sealing means being provided at the inlet and at the outlet of this g accumulation chamber, around the supply pipe, 32. Apparatus according to claim 31, I characterized in that it comprises means for ja connect the accumulation chamber to a device I capable of transmitting pressure pulses acting on the drive means of the pump power supply, this device being carried by the fixed part. 33. Apparatus according to either of; Claims 31 and 32, characterized in that the accumulation chamber is connected to a pressure regulator electrically connected to the motor of the feed pump. ; 34. Apparatus according to one or other of the I - claims 15 to 33, characterized in that! . means for subjecting the treatment liquid to periodic variations in low pressure! -45 - \ I "frequency and high amplitude act on the speed of the feed pump, controlled by a | variable speed drive, so that an increase in i -i | pressure of the treatment liquid is caused by H j t an acceleration of the speed of the feed pump! tation, while a decrease in pressure is i caused by a decrease in this speed. 35. Apparatus according to one or other of j ^ claims 15 to 34, characterized in that the !! jj hammer of the oscillator acts on the feed pipe! tation on the side opposite a fixed stop of the fixed part i 1, stop in contact with which the hose extends,; of food. : 'j 36. Apparatus according to claim 35, | characterized in that the hammer extends perpendicularly to the feed pipe through me; j opening made in a fixed support of the fixed part, on which it is pressed elastically by a | ! cam, against a return spring. 37. Apparatus according to either of claims 15 to 36, characterized in that the supply pipe has an internal passage of constant cross section, while the wall of this supply pipe is thinner in its sections extending in the feed pump, in the accumulation chamber and in the oscillator. i 38. Apparatus according to one of the resales i * i; dications 15 to 37, characterized in that the sections * S of the supply pipe extending in the supply pump and in the accumulation chamber 3 are made of a more flexible material than that $ | of the remaining sections of this supply hose. i J t? V \ & \ '1 f: ί i Ÿ i j ü - 48 -