EP0287405A1 - Method and device to unplug a tubing filled with liquid from a distance - Google Patents

Method and device to unplug a tubing filled with liquid from a distance Download PDF

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Publication number
EP0287405A1
EP0287405A1 EP88400506A EP88400506A EP0287405A1 EP 0287405 A1 EP0287405 A1 EP 0287405A1 EP 88400506 A EP88400506 A EP 88400506A EP 88400506 A EP88400506 A EP 88400506A EP 0287405 A1 EP0287405 A1 EP 0287405A1
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EP
European Patent Office
Prior art keywords
frequency
harmonic
cylinder
pressure
mode
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88400506A
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German (de)
French (fr)
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EP0287405B1 (en
Inventor
Jacques Simon
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Orano Cycle SA
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Compagnie Generale des Matieres Nucleaires SA
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Publication of EP0287405A1 publication Critical patent/EP0287405A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
    • B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
    • B08B9/0325—Control mechanisms therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
    • B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
    • B08B9/0326—Using pulsations
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F9/00—Arrangements or fixed installations methods or devices for cleaning or clearing sewer pipes, e.g. by flushing

Definitions

  • the invention relates to a method for remotely opening a pipe filled with liquid, as well as a device for implementing this method.
  • the disintegration of this plug can be done by introducing into the piping a mechanical member generally called a ferret.
  • a mechanical member generally called a ferret.
  • this technique cannot be used when the plug is formed in an inaccessible part.
  • it is not satisfactory because it leads to direct contact between the unblocking member and the generally radioactive products contained in the piping.
  • Another known uncorking technique consists in pressurizing the blocked part of the piping, by connecting it directly to the discharge orifice of a test pump. If this technique does not have the disadvantages of mechanical uncorking, it sometimes leads to the opposite of the desired result. Indeed, in some cases, the pressurization of the piping has the effect of tamping the plug, which makes uncorking by known methods practically impossible.
  • the object of the present invention is precisely a new process making it possible to remotely unclog a pipe filled with liquid, regardless of where the cap and without any risk of packing it.
  • a method for remotely unclogging a pipe filled with liquid characterized in that longitudinal pressure waves rich in harmonics are applied to one end of the pipe, an excitation frequency f e equal to the natural frequency (harmonic 1) of the incompressible mode of the system so that the harmonic n of this frequency is at the natural frequency (harmonic 1) of the compressible mode of the system, n being a integer at least equal to 1.
  • the pressure waves used are formed by pulse trains rich in harmonics, periodic and of low frequency (preferably less than 20 Hz).
  • the compliance of the system is then adjusted so that the harmonic 1 of the resonant frequency of the incompressible mode has a harmonic of frequency equal to the frequency of the harmonic 1 of the resonant frequency of the compressible mode.
  • the ratio between the duration I of a pulse and its period T is adjusted to a value for which the coefficient of the harmonic 1, 2 or 3 of the Fourier series development of the train of pulses is maximum.
  • the invention also relates to a device making it possible to implement the remote uncorking method as it has just been defined.
  • this device comprises a drain cylinder, a chamber of which can be connected to the piping, this cylinder comprising a piston driven in a reciprocating movement which is communicated to it by a motor cylinder, via '' a mechanical connection, this movement having the effect of generating in the system of pressure waves, the jack engine being powered by a hydraulic pressure source, via a servo-valve controlled by a regulator sensitive to the output signals delivered by at least one sensor linked to the engine cylinder and to input signals delivered by a generator signals, to give the pressure waves in the chamber of the drain cylinder the form of waves rich in harmonics.
  • this device further comprises an adjustable compliance device communicating with the chamber of the unblocking cylinder.
  • safety means are provided to cut off the supply to the motor cylinder when a pressure sensitive detector prevailing in the Unclogging cylinder chamber detects the rise of this pressure above a determined pressure threshold, as well as when the frequency of the pressure waves, measured by the signal generator, exceeds a determined frequency threshold.
  • FIG 1 there is shown a pipe 10 filled with liquid 12 and in which a plug 14 has formed which is to be eliminated.
  • a distance unblocking device 16 is connected to the end of the pipe 10.
  • this device 16 is designed to apply waves to the end of the pipe. of longitudinal pressure rich in harmonics.
  • This device 16 comprises a drain cylinder 18 composed of a piston 20 slidably received in a cylinder 22, inside which it defines a chamber 24.
  • the cylinder 22 is provided with connection means of conventional type (not shown ) through which the end of the pipe 10 communicates directly with the chamber 24.
  • the unblocking cylinder 18 is provided with an adjustable compliance capacity 28 communicating with the chamber 24 by a pipe 30. Inside the capacity 28, the liquid admitted by the pipe 30 is in contact with an elastic membrane 32 A compression spring 34 is interposed between the opposite face of the membrane 32 and the bottom of the capacity. The inside diameter of this capacity and the spring can be changed. In this way, the compliance of the system formed by the pipe 10 filled with liquid 12 can be adjusted. The liquid 12 is therefore present both in the chamber 24, the tank 28 under the membrane 32 and the pipe 10.
  • the unclogging device 16 further comprises a motor cylinder 36 controlling the unclogging cylinder 18.
  • the drive cylinder 36 is a conventional double-acting cylinder, composed of a piston 38 slidably received in a cylinder 40 inside which it defines a front chamber 42 and a rear chamber 44.
  • a mechanical connection constituted in the example represented by a rigid rod 46, connects the pistons 20 and 38 of the jacks 18 and 36, which are for this purpose axially aligned.
  • the pistons 20 and 38 are thus secured at a distance, so that they move together.
  • the front 42 and rear 44 chambers of the drive cylinder 36 communicate alternately via two pipes 48, 50 with a source of hydraulic pressure.
  • This pressure source is constituted by a conventional hydraulic group 52.
  • the supply of pressurized fluid to the chambers 42 or 44 of the motor cylinder 36 is effected by means of a servo-valve 54.
  • This servo-valve 54 is controlled by a regulator 56 sensitive to the signals delivered by one or more sensors 58 associated with the motor cylinder 36.
  • the sensors 58 comprise for example a sensor measuring the displacement of the piston 38 of the motor cylinder 36 and a sensor measuring the pressure in the two chambers 42 and 44 of this cylinder.
  • the regulator 56 compares the signals delivered by the sensors 58 to control signals emitted by an electronic pulse generator 60, the latter signals being representative of the shape of the pulse train to be obtained, in order to control the opening and the closing the servo valve 52 as desired.
  • the driving cylinder 36 therefore the uncoupling cylinder 18, is excited by pressure waves rich in harmonics, constituted in practice by trains of 'impulses.
  • a pressure sensor 62 sensitive to the pressure prevailing in the chamber 24 of the unblocking cylinder 18 to emit a stop signal when this pressure reaches or exceeds a threshold. determined.
  • the pulse generator 60 comprises a device for measuring the frequency of the pulses, also emitting a stop signal when the frequency exceeds a given threshold. When either or both of the preset pressure and frequency thresholds are reached, the generator 60 sends a signal cutting off the supply to the motor actuator 36. Thus, any untimely bursting or rupture is avoided.
  • This graph presents two maxima corresponding to resonance peaks whose frequencies are designated respectively by f i and f c in FIG. 2.
  • the second resonance peak of the graph in FIG. 2, which corresponds to the natural frequency f c , is a compressible mode in which the liquid 12 contained in the piping 10 behaves like a compressible medium. In this mode, the liquid column is deformable and the pressure varies along the piping.
  • FIG. 3 represents the variations of the natural frequencies f p as a function of the excitation frequency f. More precisely, this figure represents the variations of the natural frequency f i of the incompressible mode and of the natural frequency f c of the compressible mode, as a function of the excitation frequency f.
  • This graph can be obtained experimentally using a spectrum analyzer, by means of which a frequency sweep is carried out, for example from 0 to 15 Hz. A number of spectra is then stored in the memory of the analyzer successive. From the values thus stored, one can know the evolution of the different harmonics of the natural frequencies f i and f c . From the graphs thus found, the eigen frequencies sought are immediately deduced.
  • the resonance frequencies relating to harmonic 1 are the frequencies of points K and L in FIG. 3 and the resonance frequencies relating to harmonic 2 are the frequencies of points M and N.
  • the natural frequency f i of the incompressible mode is comparable to a mass-spring system.
  • This natural frequency f i is therefore given by the relation in which m corresponds to the mass of the moving liquid, k being the stiffness, which depends on both the calibration of the compliant capacity 28 of the device and the elastic characteristics of the liquid 12 such as its volume modulus. Adjusting the setting of the capacity 28 therefore makes it possible to vary the frequency f i of the incompressible mode at will.
  • FIG. 3 This characteristic is also illustrated by FIG. 3 in which three different graphs of the evolution of the frequency f i are represented as a function of the excitation frequency f, these three graphs corresponding to three different values of the compliance X of the capacitance compliant 28. These three values are designated by the references X1, X2 and X3 in FIG. 3.
  • the invention is however not limited to the superposition of harmonic 2 of the resonant frequency of the incompressible mode and harmonic 1 of the resonant frequency of the compressible mode illustrated in FIG. 3.
  • a comparable effect although of more limited effectiveness, would be obtained by adjusting the compliance X of the capacitance 28 in FIG. 1 so that the frequency of the harmonics 1 or 3 of the resonant frequency of the incompressible mode is equal to the frequency of the harmonic 1 of the resonant frequency of the compressible mode.
  • the unclogging device 16 according to the invention is designed to create a train of pulses rich in harmonics.
  • the serial decomposition of Fourier of this train of pulses shows that the importance of the different harmonics varies according to the value of the ratio between the duration I of each pulse and the period T of the train of pulses ( Figure 4).
  • this I / T ratio will preferably be chosen so that the harmonic n of the resonance frequency of the incompressible mode which is superimposed on the harmonic 1 of the resonance frequency of the compressible mode is as preponderant as possible.
  • the I / T ratio is preferably chosen in the range between 0.45 and 0.55 or failing that between 0.12 and 0.22 or 0.78 and 0.88.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Surgical Instruments (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Cleaning In General (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

Pour déboucher une tuyauterie (10) remplie d'un liquide (12) et dans laquelle s'est formé un bouchon (14), on raccorde sur la tuyauterie un dispositif (16). Ce dispositif applique sur le liquide des ondes de pression longitudinales riches en harmoniques et constituées de préférence par un train d'impulsions. Au moyen d'une capacité (28) à compliance réglable, on ajuste l'harmonique n de la fréquence de résonance du mode incompressible du système liquide (12)- tuyauterie (10), afin que sa fréquence soit égale à celle de l'harmonique 1 de la fréquence de résonance du mode compressible du système (n étant de préférence égal 1, 2 ou 3). Ceci permet de tirer partie des résonances des deux modes compressible et incompressible du système en utilisant une fréquence d'excitation basse (inférieure à 20 Hz), ce qui réduit les risques de rupture ou d'éclatement de la tuyauterie (10).To unclog a pipe (10) filled with a liquid (12) and in which a plug (14) has formed, a device (16) is connected to the pipe. This device applies longitudinal pressure waves rich in harmonics to the liquid, preferably consisting of a train of pulses. By means of a capacity (28) with adjustable compliance, the harmonic n of the resonant frequency of the incompressible mode of the liquid system (12) - piping (10) is adjusted so that its frequency is equal to that of the harmonic 1 of the resonant frequency of the compressible mode of the system (n being preferably equal to 1, 2 or 3). This makes it possible to take advantage of the resonances of the two compressible and incompressible modes of the system by using a low excitation frequency (less than 20 Hz), which reduces the risks of rupture or bursting of the piping (10).

Description

L'invention concerne un procédé permettant de déboucher à distance une tuyauterie remplie de liquide, ainsi qu'un dispositif pour la mise en oeuvre de ce procédé.The invention relates to a method for remotely opening a pipe filled with liquid, as well as a device for implementing this method.

Dans de nombreuses installations industrielles, notamment dans les industries chimiques et nucléaires, on trouve des tuyauteries dans lesquelles circulent des liquides contenant des particules solides. Ces particules créent des dépôts sur les parois des tuyauteries et conduisent fréquemment à la formation de bouchons.In many industrial installations, notably in the chemical and nuclear industries, there are pipes in which liquids containing solid particles circulate. These particles create deposits on the walls of the pipes and frequently lead to the formation of plugs.

Lorsque le bouchon se forme dans une partie accessible de la tuyauterie, la désagrégation de ce bouchon peut se faire en introduisant dans la tuyauterie un organe mécanique généralement appelé furet. Cependant, cette technique n'est pas utilisable lorsque le bouchon est formé dans une partie inaccessible. De plus, dans l'industrie nucléaire, elle n'est pas satisfaisante car elle conduit à un contact direct entre l'organe de débouchage et les produits généralement radioactifs contenus dans la tuyauterie.When the plug forms in an accessible part of the piping, the disintegration of this plug can be done by introducing into the piping a mechanical member generally called a ferret. However, this technique cannot be used when the plug is formed in an inaccessible part. In addition, in the nuclear industry, it is not satisfactory because it leads to direct contact between the unblocking member and the generally radioactive products contained in the piping.

Une autre technique de débouchage connue consiste à mettre sous pression la partie bouchée de la tuyauterie, en raccordant celle-ci directement sur l'orifice de refoulement d'une pompe d'épreuve. Si cette technique ne présente pas les inconvénients du débouchage mécanique, elle conduit parfois à l'inverse du résultat recherché. En effet, dans certains cas, la mise sous pression de la tuyauterie a pour effet de tasser le bouchon, ce qui rend son débouchage par les méthodes connues pratiquement impossible.Another known uncorking technique consists in pressurizing the blocked part of the piping, by connecting it directly to the discharge orifice of a test pump. If this technique does not have the disadvantages of mechanical uncorking, it sometimes leads to the opposite of the desired result. Indeed, in some cases, the pressurization of the piping has the effect of tamping the plug, which makes uncorking by known methods practically impossible.

La présente invention a précisément pour objet un procédé nouveau permettant de déboucher à distance une tuyauterie remplie de liquide, quel que soit l'endroit où s'est formé le bouchon et sans aucun risque de tasser celui-ci.The object of the present invention is precisely a new process making it possible to remotely unclog a pipe filled with liquid, regardless of where the cap and without any risk of packing it.

A cet effet et conformément à l'invention, il est proposé un procédé de débouchage à distance d'une tuyauterie remplie de liquide, caractérisé en ce qu'on applique à une extrémité de la tuyauterie des ondes de pression longitudinales riches en harmoniques, à une fréquence d'excitation fe égale à la fréquence propre (harmonique 1) du mode incompressible du système de telle sorte que l'harmonique n de cette fréquence soit à la fréquence propre (harmonique 1) du mode compressible du système, n étant un entier au moins égal à 1.To this end and in accordance with the invention, a method is provided for remotely unclogging a pipe filled with liquid, characterized in that longitudinal pressure waves rich in harmonics are applied to one end of the pipe, an excitation frequency f e equal to the natural frequency (harmonic 1) of the incompressible mode of the system so that the harmonic n of this frequency is at the natural frequency (harmonic 1) of the compressible mode of the system, n being a integer at least equal to 1.

Cette adaptation des deux modes compressible et incompressible est obtenue par variation de la compliance du système liquide-tuyauterie.This adaptation of the two compressible and incompressible modes is obtained by varying the compliance of the liquid-piping system.

De préférence, les ondes de pression utilisées sont formées par des trains d'impulsions riches en harmoniques, périodiques et de basse fréquence (de préférence inférieure à 20 Hz).Preferably, the pressure waves used are formed by pulse trains rich in harmonics, periodic and of low frequency (preferably less than 20 Hz).

On règle alors la compliance du système de telle sorte que l'harmonique 1 de la fréquence de résonance du mode incompressible ait un harmonique de fréquence égale à la fréquence de l'harmonique 1 de la fréquence de résonance du mode compressible.The compliance of the system is then adjusted so that the harmonic 1 of the resonant frequency of the incompressible mode has a harmonic of frequency equal to the frequency of the harmonic 1 of the resonant frequency of the compressible mode.

Dans ce cas, on ajuste le rapport entre la durée I d'une impulsion et sa période T à une valeur pour laquelle le coefficient de l'harmonique 1, 2 ou 3 du développement en série de Fourier du train d'impulsions est maximum.In this case, the ratio between the duration I of a pulse and its period T is adjusted to a value for which the coefficient of the harmonic 1, 2 or 3 of the Fourier series development of the train of pulses is maximum.

L'invention a également pour objet un dispositif permettant de mettre en oeuvre le procédé de débouchage à distance tel qu'il vient d'être défini.The invention also relates to a device making it possible to implement the remote uncorking method as it has just been defined.

Selon l'invention, ce dispositif comprend un vérin de débouchage dont une chambre peut être raccordée sur la tuyauterie, ce vérin comportant un piston animé d'un mouvement de va et vient qui lui est communiqué par un vérin moteur, par l'intermédiaire d'une liaison mécanique, ce mouvement ayant pour effet d'engendrer dans le système des ondes de pression, le vérin moteur étant alimenté par une source de pression hydraulique, par l'intermédiaire d'une servo-valve commandée par un régulateur sensible aux signaux de sortie délivrés par au moins un capteur lié au vérin moteur et à des signaux d'entrée délivrés par un générateur de signaux, pour donner aux ondes de pression dans la chambre du vérin de débouchage la forme d'ondes riches en harmoniques.According to the invention, this device comprises a drain cylinder, a chamber of which can be connected to the piping, this cylinder comprising a piston driven in a reciprocating movement which is communicated to it by a motor cylinder, via '' a mechanical connection, this movement having the effect of generating in the system of pressure waves, the jack engine being powered by a hydraulic pressure source, via a servo-valve controlled by a regulator sensitive to the output signals delivered by at least one sensor linked to the engine cylinder and to input signals delivered by a generator signals, to give the pressure waves in the chamber of the drain cylinder the form of waves rich in harmonics.

Afin de permettre le réglage de la compliance de la tuyauterie, ce dispositif comprend de plus un dispositif à compliance réglable communiquant avec la chambre du vérin de débouchage.In order to allow adjustment of the compliance of the piping, this device further comprises an adjustable compliance device communicating with the chamber of the unblocking cylinder.

Selon un autre aspect de l'invention, afin d'éviter tout risque d'éclatement ou de rupture de la tuyauterie, des moyens de sécurité sont prévus pour couper l'alimentation du vérin moteur lorsqu'un détecteur sensible à la pression régnant dans la chambre du vérin de débouchage détecte la montée de cette pression au-dessus d'un seuil de pression déterminé, ainsi que lorsque la fréquence des ondes de pression, mesurée par le générateur de signaux, dépasse un seuil de fréquence déterminé.According to another aspect of the invention, in order to avoid any risk of bursting or rupture of the piping, safety means are provided to cut off the supply to the motor cylinder when a pressure sensitive detector prevailing in the Unclogging cylinder chamber detects the rise of this pressure above a determined pressure threshold, as well as when the frequency of the pressure waves, measured by the signal generator, exceeds a determined frequency threshold.

Un mode de réalisation préféré de l'invention va maintenant être décrit à titre d'exemple nullement limitatif en se référant aux dessins annexés dans lesquels :

  • - la figure 1 est une vue représentant de façon schématique un dispositif de débouchage à distance conforme à l'invention, raccordé sur une tuyauterie à déboucher, les liaisons mécaniques d'appui n'étant pas représentées ;
  • - la figure 2 représente l'évolution de la pression P₂ au droit du bouchon formé dans la tuyauterie, en fonction de la fréquence d'excitation f du train d'impulsions ;
  • - la figure 3 représente l'évolution des fréquences propres fp, désignées respectivement par fi et fc pour les modes incompressible et compressible du système, en fonction de la fréquence d'excitation f, l'évolution de la fréquence propre fi du mode incompressible étant représentée pour trois valeurs X₁, X₂ et X₃ de la compliance de la capacité à compliance réglable du dispositif de la figure 1 ; et
  • - la figure 4 représente un exemple de train d'impulsions utilisable, c'est-à-dire l'évolution de l'amplitude de ce train d'impulsions en fonction du temps ;
A preferred embodiment of the invention will now be described by way of non-limiting example with reference to the accompanying drawings in which:
  • - Figure 1 is a view schematically showing a remote uncorking device according to the invention, connected to a piping to unclog, the mechanical support connections not being shown;
  • - Figure 2 shows the evolution of the pressure P₂ to the right of the plug formed in the piping, as a function of the excitation frequency f of the pulse train;
  • - Figure 3 represents the evolution of the natural frequencies f p , designated respectively by f i and f c for the incompressible and compressible modes of the system, according to the excitation frequency f, the evolution of the natural frequency f i of the incompressible mode being represented for three values X₁, X₂ and X₃ of the compliance of the adjustable compliance capacity of the device of Figure 1; and
  • - Figure 4 shows an example of a usable pulse train, that is to say the evolution of the amplitude of this pulse train as a function of time;

Sur la figure 1, on a représenté une tuyauterie 10 remplie de liquide 12 et dans laquelle s'est formé un bouchon 14 que l'on désire éliminer.In Figure 1, there is shown a pipe 10 filled with liquid 12 and in which a plug 14 has formed which is to be eliminated.

A cet effet, on raccorde à l'extrémité de la tuyauterie 10 un dispositif de débouchage distance désigné de façon générale par la référence 16. Conformément à l'invention, ce dispositif 16 est conçu pour appliquer à l'extrémité de la tuyauterie des ondes de pression longitudinales riches en harmoniques.To this end, a distance unblocking device generally designated by the reference 16 is connected to the end of the pipe 10. According to the invention, this device 16 is designed to apply waves to the end of the pipe. of longitudinal pressure rich in harmonics.

Ce dispositif 16 comprend un vérin de débouchage 18 composé d'un piston 20 reçu de façon coulissante dans un cylindre 22, à l'intérieur duquel il définit une chambre 24. Le cylindre 22 est pourvu de moyens de raccordement de type classique (non représentés) par lesquels l'extrémité de la tuyauterie 10 communique directement avec la chambre 24.This device 16 comprises a drain cylinder 18 composed of a piston 20 slidably received in a cylinder 22, inside which it defines a chamber 24. The cylinder 22 is provided with connection means of conventional type (not shown ) through which the end of the pipe 10 communicates directly with the chamber 24.

Le vérin de débouchage 18 est muni d'une capacité à compliance réglable 28 communiquant avec la chambre 24 par une tuyauterie 30. A l'intérieur de la capacité 28, le liquide admis par la tuyauterie 30 est au contact d'une membrane élastique 32. Un ressort de compression 34 est interposé entre la face opposée de la membrane 32 et le fond de la capacité. Le diamètre intérieur de cette capacité et le ressort peuvent être modifiés. De cette manière, on peut régler la compliance du système formé par la tuyauterie 10 remplie de liquide 12. Le liquide 12 est donc présent à la fois dans la chambre 24, la capacité 28 sous la membrane 32 et la tuyauterie 10.The unblocking cylinder 18 is provided with an adjustable compliance capacity 28 communicating with the chamber 24 by a pipe 30. Inside the capacity 28, the liquid admitted by the pipe 30 is in contact with an elastic membrane 32 A compression spring 34 is interposed between the opposite face of the membrane 32 and the bottom of the capacity. The inside diameter of this capacity and the spring can be changed. In this way, the compliance of the system formed by the pipe 10 filled with liquid 12 can be adjusted. The liquid 12 is therefore present both in the chamber 24, the tank 28 under the membrane 32 and the pipe 10.

Le dispositif de débouchage 16 comprend de plus un vérin moteur 36 commandant le vérin de débouchage 18.The unclogging device 16 further comprises a motor cylinder 36 controlling the unclogging cylinder 18.

Plus précisément, le vérin moteur 36 est un vérin double effet classique, composé d'un piston 38 reçu de façon coulissante dans un cylindre 40 à l'intérieur duquel il définit une chambre avant 42 et une chambre arrière 44.More specifically, the drive cylinder 36 is a conventional double-acting cylinder, composed of a piston 38 slidably received in a cylinder 40 inside which it defines a front chamber 42 and a rear chamber 44.

Une liaison mécanique, constituée dans l'exemple représenté par une tige rigide 46, relie les pistons 20 et 38 des vérins 18 et 36, qui sont à cet effet axialement alignés. Les pistons 20 et 38 sont ainsi solidarisés à distance, de sorte qu'ils se déplacent conjointement.A mechanical connection, constituted in the example represented by a rigid rod 46, connects the pistons 20 and 38 of the jacks 18 and 36, which are for this purpose axially aligned. The pistons 20 and 38 are thus secured at a distance, so that they move together.

Les chambres avant 42 et arrière 44 du vérin moteur 36 communiquent alternativement par l'intermédiaire de deux tuyauteries 48, 50 avec une source de pression hydraulique. Cette source de pression est constituée par un groupe hydraulique classique 52.The front 42 and rear 44 chambers of the drive cylinder 36 communicate alternately via two pipes 48, 50 with a source of hydraulic pressure. This pressure source is constituted by a conventional hydraulic group 52.

L'alimentation en fluide sous pression des chambres 42 ou 44 du vérin moteur 36 s'effectue par l'intermédiaire d'une servo-valve 54. Cette servo-valve 54 est commandée par un régulateur 56 sensible aux signaux délivrés par un ou plusieurs capteurs 58 associés au vérin moteur 36.The supply of pressurized fluid to the chambers 42 or 44 of the motor cylinder 36 is effected by means of a servo-valve 54. This servo-valve 54 is controlled by a regulator 56 sensitive to the signals delivered by one or more sensors 58 associated with the motor cylinder 36.

Les capteurs 58 comprennent par exemple un capteur mesurant le déplacement du piston 38 du vérin moteur 36 et un capteur mesurant la pression dans les deux chambres 42 et 44 de ce vérin.The sensors 58 comprise for example a sensor measuring the displacement of the piston 38 of the motor cylinder 36 and a sensor measuring the pressure in the two chambers 42 and 44 of this cylinder.

Le régulateur 56 compare les signaux délivrés par les capteurs 58 à des signaux de commande émis par un générateur électronique d'impulsions 60, ces derniers signaux étant représentatifs de la forme du train d'impulsions à obtenir, afin de commander l'ouverture et la fermeture de la servo-valve 52 de la manière souhaitée.The regulator 56 compares the signals delivered by the sensors 58 to control signals emitted by an electronic pulse generator 60, the latter signals being representative of the shape of the pulse train to be obtained, in order to control the opening and the closing the servo valve 52 as desired.

Conformément à l'invention et pour des raisons qui apparaîtront plus clairement dans la suite de la description, on excite le vérin moteur 36, donc le vérin de débouchage 18, par des ondes de pression riches en harmoniques, constituées en pratique par des trains d'impulsions.In accordance with the invention and for reasons which will appear more clearly in the following description, the driving cylinder 36, therefore the uncoupling cylinder 18, is excited by pressure waves rich in harmonics, constituted in practice by trains of 'impulses.

La sécurité de fonctionnement est assurée par un capteur de pression 62, sensible à la pression régnant dans la chambre 24 du vérin de débouchage 18 pour émettre un signal d'arrêt lorsque cette pression atteint ou dépasse un seuil déterminé. De même, le générateur d'impulsions 60 comprend un dispositif de mesure de la fréquence des impulsions, émettant également un signal d'arrêt lorsque la fréquence excède un seuil donné. Lorsque sont atteints l'un ou l'autre, ou les deux seuils de pression et de fréquence préréglés, le générateur 60 envoie un signal coupant l'alimentation du vérin moteur 36. Ainsi, tout éclatement ou rupture intempestifs sont évités.Operating safety is ensured by a pressure sensor 62, sensitive to the pressure prevailing in the chamber 24 of the unblocking cylinder 18 to emit a stop signal when this pressure reaches or exceeds a threshold. determined. Likewise, the pulse generator 60 comprises a device for measuring the frequency of the pulses, also emitting a stop signal when the frequency exceeds a given threshold. When either or both of the preset pressure and frequency thresholds are reached, the generator 60 sends a signal cutting off the supply to the motor actuator 36. Thus, any untimely bursting or rupture is avoided.

Des mesures expérimentales ont permis, en faisant varier la fréquence d'excitation f de manière monotone de 0 à 15 Hz, de relever les variations de la pression P₂ au niveau du bouchon 14. Le graphe correspondant est représenté sur la figure 2.Experimental measurements have made it possible, by varying the excitation frequency f monotonically from 0 to 15 Hz, to note the variations in pressure P₂ at the level of plug 14. The corresponding graph is shown in FIG. 2.

Ce graphe présente deux maxima correspondant à des pics de résonance dont les fréquences sont désignées respectivement par fi et fc sur la figure 2.This graph presents two maxima corresponding to resonance peaks whose frequencies are designated respectively by f i and f c in FIG. 2.

L'analyse théorique de ce résultat montre que la fréquence propre fi la plus basse relevée sur le graphe de la figure 2 correspond un mode incompressible des ondes de compression longitudinales appliquées à la colonne de liquide 12. Suivant ce mode, le liquide 12 se comporte comme un milieu incompressible, c'est-à-dire que la colonne de liquide est indéformable. La pression selon ce mode est donc la même en tout point de la colonne.The theoretical analysis of this result shows that the lowest natural frequency f i noted on the graph in FIG. 2 corresponds to an incompressible mode of the longitudinal compression waves applied to the column of liquid 12. According to this mode, the liquid 12 is behaves as an incompressible medium, that is to say that the liquid column is non-deformable. The pressure according to this mode is therefore the same at all points of the column.

Le deuxième pic de résonance du graphe de la figure 2, qui correspond à la fréquence propre fc, est un mode compressible dans lequel le liquide 12 contenu dans la tuyauterie 10 se comporte comme un milieu compressible. Dans ce mode, la colonne de liquide est déformable et la pression varie tout le long de la tuyauterie.The second resonance peak of the graph in FIG. 2, which corresponds to the natural frequency f c , is a compressible mode in which the liquid 12 contained in the piping 10 behaves like a compressible medium. In this mode, the liquid column is deformable and the pressure varies along the piping.

En réalité, l'expérience montre qu'il existe des couplages entre les modes compressible et incompressible. En effet, si en statique la pression est identique en tous les points de la colonne liquide, dès les basses fréquences de l'ordre de 1 Hz, les effets de la compressibilité se font sentir et l'on conçoit que ces effets sont d'autant plus grands que la fréquence d'excitation f est plus élevée. Comme la compressibilité introduit une élasticité supplémentaire, les fréquences propres du mode incompressible fi et du mode compressible fc ont toutes deux tendance à décroître avec la fréquence d'excitation f.In reality, experience shows that there are couplings between the compressible and incompressible modes. Indeed, if in static pressure is identical at all points of the liquid column, from low frequencies of the order of 1 Hz, the effects of compressibility are felt and it is understood that these effects are of as much larger than the excitation frequency f is higher. As the compressibility introduces an additional elasticity, the natural frequencies of the incompressible mode f i and of the compressible mode f c both tend to decrease with the excitation frequency f.

Cette analyse théorique est confirmée par la figure 3 qui représente les variations des fréquences propres fp en fonction de la fréquence d'excitation f. Plus précisément, cette figure représente les variations de la fréquence propre fi du mode incompressible et de la fréquence propre fc du mode compressible, en fonction de la fréquence d'excitation f.This theoretical analysis is confirmed by FIG. 3 which represents the variations of the natural frequencies f p as a function of the excitation frequency f. More precisely, this figure represents the variations of the natural frequency f i of the incompressible mode and of the natural frequency f c of the compressible mode, as a function of the excitation frequency f.

Ce graphe peut être obtenu expérimentalement à l'aide d'un analyseur de spectre, au moyen duquel on effectue un balayage en fréquence, par exemple de 0 à 15 Hz. On stocke alors dans la mémoire de l'analyseur un certain nombre de spectres successifs. A partir des valeurs ainsi mises en mémoire, on peut connaître l'évolution des différents harmoniques des fréquences propres fi et fc. Des graphes ainsi trouvés, on déduit immédiatement les fréquences propres recherchées.This graph can be obtained experimentally using a spectrum analyzer, by means of which a frequency sweep is carried out, for example from 0 to 15 Hz. A number of spectra is then stored in the memory of the analyzer successive. From the values thus stored, one can know the evolution of the different harmonics of the natural frequencies f i and f c . From the graphs thus found, the eigen frequencies sought are immediately deduced.

Lorsque la fréquence fi ou fc est égale à la fréquence f de l'excitation ou à la fréquence de l'un de ses harmoniques, il y a amplification du mouvement du liquide à l'intérieur de la tuyauterie. On est alors à la résonance. Cette circonstance se produit à l'intersection des graphes fi et fc avec les droites d₁ de pente 1, d₂ de pente 2, etc... sur la figure 3.When the frequency f i or f c is equal to the frequency f of the excitation or to the frequency of one of its harmonics, there is amplification of the movement of the liquid inside the piping. We are then at resonance. This circumstance occurs at the intersection of the graphs f i and f c with the lines d₁ of slope 1, d₂ of slope 2, etc ... in Figure 3.

En conséquence, les fréquences de résonance relatives à l'harmonique 1 sont les fréquences des points K et L sur la figure 3 et les fréquences de résonance relatives à l'harmonique 2 sont les fréquences des points M et N.Consequently, the resonance frequencies relating to harmonic 1 are the frequencies of points K and L in FIG. 3 and the resonance frequencies relating to harmonic 2 are the frequencies of points M and N.

D'autre part, la fréquence propre fi du mode incompressible est assimilable à un système à masse-ressort. Cette fréquence propre fi est donc donnée par la relation

Figure imgb0001
dans laquelle m correspond à la mass du liquide en mouvement, k étant la raideur, qui dépend à la fois du tarage de la capacité compliante 28 du dispositif et des caractéristiques élastiques du liquide 12 telles que son module volumique. Le réglage du tarage de la capacité 28 permet donc de faire varier à volonté la fréquence fi du mode incompressible.On the other hand, the natural frequency f i of the incompressible mode is comparable to a mass-spring system. This natural frequency f i is therefore given by the relation
Figure imgb0001
 in which m corresponds to the mass of the moving liquid, k being the stiffness, which depends on both the calibration of the compliant capacity 28 of the device and the elastic characteristics of the liquid 12 such as its volume modulus. Adjusting the setting of the capacity 28 therefore makes it possible to vary the frequency f i of the incompressible mode at will.

Cette caractéristique est également illustrée par la figure 3 sur laquelle sont représentés trois graphes différents de l'évolution de la fréquence fi en fonction de la fréquence d'excitation f, ces trois graphes correspondant à trois valeurs différentes de la compliance X de la capacité compliante 28. Ces trois valeurs sont désignées par les références X₁, X₂ et X₃ sur la figure 3.This characteristic is also illustrated by FIG. 3 in which three different graphs of the evolution of the frequency f i are represented as a function of the excitation frequency f, these three graphs corresponding to three different values of the compliance X of the capacitance compliant 28. These three values are designated by the references X₁, X₂ and X₃ in FIG. 3.

Comme on l'a représenté en trait plein sur la figure 3, il existe donc une valeur X₂ de la compliance de la capacité 28, pour laquelle, le système étant excité à la fréquence fe égale à la fréquence de résonance du mode incompressible du système liquide 12- tuyauterie 10, l'harmonique 2 de cette fréquence a pour fréquence la fréquence de résonance du mode compressible. La résonance du mode incompressible est obtenue au point K de la figure 3, celle du mode compressible au point N de la même figure. En excitant la colonne de liquide à cette fréquence particulière, désignée par fe sur la figure 3, des ondes de pression efficaces peuvent être obtenues.As shown in solid lines in FIG. 3, there is therefore a value X₂ of the compliance of the capacitor 28, for which, the system being excited at the frequency f e equal to the resonance frequency of the incompressible mode of the liquid system 12- piping 10, the harmonic 2 of this frequency has as frequency the resonance frequency of the compressible mode. The resonance of the incompressible mode is obtained at point K of FIG. 3, that of the compressible mode at point N of the same figure. By exciting the liquid column at this particular frequency, designated f e in Figure 3, effective pressure waves can be obtained.

En outre, ces effets d'amplification sont obtenus à une fréquence d'excitation fe relativement basse et notamment inférieure à la fréquence d'excitation de l'harmonique 1 correspondant à la résonance du mode compressible (fréquence du point L sur la figure 3). Cette solution présente l'avantage de réduire les problèmes de tenue mécanique de la tuyauterie qui s'aggravent lorsque la fréquence augmente.In addition, these amplification effects are obtained at a relatively low excitation frequency f e and in particular less than the excitation frequency of the harmonic 1 corresponding to the resonance of the compressible mode (frequency of the point L in FIG. 3 ). This solution has the advantage of reducing the mechanical resistance problems of the piping which worsen when the frequency increases.

L'invention n'est toutefois pas limitée à la superposition de l'harmonique 2 de la fréquence de résonance du mode incompressible et de l'harmonique 1 de la fréquence de résonance du mode compressible illustrée sur la figure 3. Ainsi, un effet comparable, bien que d'efficacité plus limitée, serait obtenu en réglant la compliance X de la capacité 28 sur la figure 1 de telle sorte que la fréquence des harmoniques 1 ou 3 de la fréquence de résonance du mode incompressible soit égale à la fréquence de l'harmonique 1 de la fréquence de résonance du mode compressible.The invention is however not limited to the superposition of harmonic 2 of the resonant frequency of the incompressible mode and harmonic 1 of the resonant frequency of the compressible mode illustrated in FIG. 3. Thus, a comparable effect , although of more limited effectiveness, would be obtained by adjusting the compliance X of the capacitance 28 in FIG. 1 so that the frequency of the harmonics 1 or 3 of the resonant frequency of the incompressible mode is equal to the frequency of the harmonic 1 of the resonant frequency of the compressible mode.

Par ailleurs, il est clair que l'effet recherché varie dans le même sens que la richesse en harmoniques des ondes de pression longitudinales. C'est pourquoi le dispositif de débouchage 16 selon l'invention est conçu pour créer un train d'impulsions riche en harmoniques.Furthermore, it is clear that the desired effect varies in the same direction as the richness in harmonics of the longitudinal pressure waves. This is why the unclogging device 16 according to the invention is designed to create a train of pulses rich in harmonics.

Dans ce mode de réalisation préféré de l'invention selon lequel l'excitation de la colonne de liquide contenue dans la tuyauterie à déboucher est obtenue en créant dans le dispositif 16 de la figure 1 un train d'impulsions adéquat, la décomposition en série de Fourier de ce train d'impulsions montre que l'importance des différents harmoniques varie selon la valeur du rapport entre la durée I de chaque impulsion et la période T du train d'impulsions (figure 4). Selon un aspect intéressant de l'invention, on choisira de préférence ce rapport I/T afin que l'harmonique n de la fréquence de résonance du mode incompressible qui se trouve superposé à l'harmonique 1 de la fréquence de résonance du mode compressible soit aussi prépondérant que possible.In this preferred embodiment of the invention according to which the excitation of the column of liquid contained in the piping to be unblocked is obtained by creating in the device 16 of FIG. 1 an adequate pulse train, the serial decomposition of Fourier of this train of pulses shows that the importance of the different harmonics varies according to the value of the ratio between the duration I of each pulse and the period T of the train of pulses (Figure 4). According to an interesting aspect of the invention, this I / T ratio will preferably be chosen so that the harmonic n of the resonance frequency of the incompressible mode which is superimposed on the harmonic 1 of the resonance frequency of the compressible mode is as preponderant as possible.

A titre d'exemple, le cas représenté sur la figure 2 (n=2) conduit, pour un train d'impulsions rectangulaire, à choisir le rapport I/T dans l'intervalle compris entre 0,20 et 0,30 ou compris entre 0,7 et 0,8.By way of example, the case represented in FIG. 2 (n = 2) leads, for a rectangular pulse train, to choose the I / T ratio in the range between 0.20 and 0.30 or included between 0.7 and 0.8.

Au contraire, dans le cas où n=3 et toujours pour un train d'impulsions rectangulaires, le rapport I/T est choisi de préférence dans l'intervalle compris entre 0,45 et 0,55 ou à défaut entre 0,12 et 0,22 ou 0,78 et 0,88.On the contrary, in the case where n = 3 and always for a train of rectangular pulses, the I / T ratio is preferably chosen in the range between 0.45 and 0.55 or failing that between 0.12 and 0.22 or 0.78 and 0.88.

Claims (11)

1. Procédé de débouchage à distance d'une tuyauterie (10) remplie de liquide (12), caractérisé en ce qu'on applique à une extrémité de la tuyauterie des ondes de pression longitudinales riches en harmoniques, à une fréquence d'excitation fe égale à la fréquence de résonance de l'harmonique 1 d'un mode incompressible du système formé par la tuyauterie remplie de liquide, après avoir réglé la compliance de ce système de telle sorte que l'harmonique n de cette fréquence d'excitation fe à soit la fréquence de l'harmonique 1 de la fréquence de résonance d'un mode compressible du système, n étant un entire au moins égal à 1.1. A method of unblocking a pipe (10) filled with liquid (12) remotely, characterized in that longitudinal pressure waves rich in harmonics are applied to one end of the pipe, at an excitation frequency f e equal to the resonance frequency of the harmonic 1 of an incompressible mode of the system formed by the piping filled with liquid, after having adjusted the compliance of this system so that the harmonic n of this excitation frequency f e is the frequency of the harmonic 1 of the resonance frequency of a compressible mode of the system, n being an integer at least equal to 1. 2. Procédé selon la revendication 1, caractérisé en ce qu'on applique à l'extrémité de la tuyauterie (10) des ondes de pression formées par un train d'impulsions riches en harmoniques.2. Method according to claim 1, characterized in that pressure waves formed by a train of pulses rich in harmonics are applied to the end of the piping (10). 3. Procédé selon la revendication 2, caractérisé en ce qu'on règle la compliance du système de telle sorte que l'harmonique 1 de la fréquence de résonance du mode incompressible ait un harmonique 1 de fréquence égale à la fréquence de l'harmonique 1 de la fréquence de résonance du mode compressible et en ce qu'on ajuste le rapport entre la durée I d'une impulsion et la période T des ondes de pression à une valeur pour laquelle le coefficient de l'harmonique 1 du développement en série de Fourier du train d'impulsions est maximum.3. Method according to claim 2, characterized in that the compliance of the system is adjusted so that the harmonic 1 of the resonant frequency of the incompressible mode has a harmonic 1 of frequency equal to the frequency of the harmonic 1 the resonant frequency of the compressible mode and in that the ratio between the duration I of a pulse and the period T of the pressure waves is adjusted to a value for which the coefficient of the harmonic 1 of the development in series of Fourier of the pulse train is maximum. 4. Procédé selon la revendication 2, caractérisé en ce qu'on règle la compliance du système de telle sorte que l'harmonique 1 de la fréquence de résonance du mode incompressible ait un harmonique 2 de fréquence égale à la fréquence de l'harmonique 1 de la fréquence de résonance du mode compressible et en ce qu'on ajuste le rapport entre la durée I d'une impulsion et la période T des ondes de pression à une valeur pour laquelle le coefficient de l'harmonique 2 du développement en série de Fourier du train d'impulsions est maximum.4. Method according to claim 2, characterized in that the compliance of the system is adjusted so that the harmonic 1 of the resonant frequency of the incompressible mode has a harmonic 2 of frequency equal to the frequency of the harmonic 1 of the resonant frequency of the compressible mode and in that the ratio between the duration I of a pulse and the period T of the pressure waves is adjusted to a value for which the coefficient of the harmonic 2 of the development in series of Fourier of the pulse train is maximum. 5. Procédé selon la revendication 2, caractérisé en ce qu'on règle la compliance du système de telle sorte que l'harmonique 1 de la fréquence de résonance du mode incompressible ait un harmonique 3 de fréquence égale à la fréquence de l'harmonique 1 de la fréquence de résonance du mode compressible et en ce qu'on ajuste le rapport entre la durée I d'une impulsion et la période T des ondes de pression à une valeur pour laquelle le coefficient de l'harmonique 3 du développement en série de Fourier du train d'impulsions est maximum.5. Method according to claim 2, characterized in that the compliance of the system is adjusted so that the harmonic 1 of the resonance frequency of the incompressible mode has a harmonic 3 of frequency equal to the frequency of the harmonic 1 of the resonant frequency of the compressible mode and in that the ratio between the duration I of a pulse and the period T of the pressure waves is adjusted to a value for which the coefficient of the harmonic 3 of the development in series of Fourier of the pulse train is maximum. 6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la fréquence d'excitation à la résonance f est inférieure à 20 Hz.6. Method according to any one of claims 1 to 5, characterized in that the excitation frequency at resonance f is less than 20 Hz. 7. Dispositif pour le débouchage distance d'une tuyauterie (10) remplie de liquide (12) selon le procédé de l'une quelconque des revendications 1 à 6, caractérisé en ce que ce dispositif (16) comprend un vérin de débouchage (18) dont une chambre (24) peut être raccordée sur la tuyauterie (10), ce vérin comportant un piston (20) animé d'un mouvement de va et vient qui lui est communiqué par un vérin moteur (36), par l'intermédiaire d'une liaison mécanique (46), ce mouvement ayant pour effet d'engendrer dans le système des ondes de pression, le vérin moteur (36) étant alimenté par une source de pression hydraulique (52), par l'intermédiaire d'une servo-valve (54) commandée par un régulateur (56) sensible aux signaux de sortie délivrés par au moins un capteur (58) lié au vérin moteur (36) et à des signaux d'entrée délivrés par un générateur de signaux (60), pour donner aux ondes de pression dans la chambre (24) du vérin de débouchage (18) la forme d'ondes riches en harmoniques.7. Device for the remote unblocking of a pipe (10) filled with liquid (12) according to the method of any one of claims 1 to 6, characterized in that this device (16) comprises a unblocking cylinder (18 ) a chamber (24) of which can be connected to the piping (10), this cylinder comprising a piston (20) driven back and forth which is communicated to it by a motor cylinder (36), by means of a mechanical link (46), this movement having the effect of generating pressure waves in the system, the drive cylinder (36) being supplied by a hydraulic pressure source (52), via a servo-valve (54) controlled by a regulator (56) sensitive to the output signals delivered by at least one sensor (58) linked to the motor cylinder (36) and to input signals delivered by a signal generator (60) , to give the pressure waves in the chamber (24) of the unblocking cylinder (18) the form of waves rich in harmonics. 8. Dispositif selon la revendication 7, caractérisé en ce qu'il comprend de plus un dispositif (28) à compliance réglable communiquant avec la chambre (24) du vérin de débouchage (18).8. Device according to claim 7, characterized in that it further comprises a device (28) with adjustable compliance communicating with the chamber (24) of the unblocking cylinder (18). 9. Dispositif selon l'une quelconque des revendications 7 et 8, caractérisé en ce que le régulateur (56) est sensible aux signaux de sortie délivrés par un capteur de pression et un capteur de déplacement du piston (38) du vérin moteur (36).9. Device according to any one of claims 7 and 8, characterized in that the regulator (56) is sensitive to the output signals delivered by a pressure sensor and a piston displacement sensor (38) of the engine cylinder (36). 10. Dispositif selon l'une quelconque des revendications 7 à 9, caractérisé en ce que des moyens de sécurité sont prévus pour couper l'alimentation du vérin moteur (36) lorsqu'un détecteur (62) sensible à la pression régnant dans la chambre (24) du vérin de débouchage (18) détecte la montée de cette pression au-dessus d'un seuil de pression déterminé, ainsi que lorsque la fréquence des ondes de pression, mesurée par le générateur de signaux (60), dépasse un seuil de fréquence déterminé.10. Device according to any one of claims 7 to 9, characterized in that safety means are provided to cut off the supply to the motor cylinder (36) when a detector (62) sensitive to the pressure prevailing in the chamber (24) of the unblocking cylinder (18) detects the rise of this pressure above a determined pressure threshold, as well as when the frequency of the pressure waves, measured by the signal generator (60), exceeds a threshold frequency determined. 11. Dispositif selon la revendication 10, caractérisé en ce que le détecteur sensible à la pression est un capteur de pression (62).11. Device according to claim 10, characterized in that the pressure-sensitive detector is a pressure sensor (62).
EP88400506A 1987-03-04 1988-03-03 Method and device to unplug a tubing filled with liquid from a distance Expired - Lifetime EP0287405B1 (en)

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US2351163A (en) * 1943-01-21 1944-06-13 Diamond Power Speciality Boiler cleaner
GB686842A (en) * 1950-01-25 1953-02-04 Airnesco Products Ltd Fluid pressure actuated blast gun primarily for cleaning purposes
DE893595C (en) * 1951-12-29 1953-10-19 Adalbert Besta Process for loosening and removing deposits and deposits in sewers and pipes
CH567887A5 (en) * 1973-05-04 1975-10-15 Pk Byuro Elektrogidravliki An
DE3018872A1 (en) * 1980-05-16 1981-11-26 BHT Hygiene-Technik GmbH, 8000 München Cleaning system for glass chemical vessels - interrupts cleaning-liquid spray long enough for films to break on vessels

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CA837971A (en) * 1970-03-31 Karpovich John Cyclic water hammer apparatus and method
US2560728A (en) * 1945-04-21 1951-07-17 Lee Foundation For Nutritional Wave energy apparatus
US4645542A (en) * 1984-04-26 1987-02-24 Anco Engineers, Inc. Method of pressure pulse cleaning the interior of heat exchanger tubes located within a pressure vessel such as a tube bundle heat exchanger, boiler, condenser or the like

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2351163A (en) * 1943-01-21 1944-06-13 Diamond Power Speciality Boiler cleaner
GB686842A (en) * 1950-01-25 1953-02-04 Airnesco Products Ltd Fluid pressure actuated blast gun primarily for cleaning purposes
DE893595C (en) * 1951-12-29 1953-10-19 Adalbert Besta Process for loosening and removing deposits and deposits in sewers and pipes
CH567887A5 (en) * 1973-05-04 1975-10-15 Pk Byuro Elektrogidravliki An
DE3018872A1 (en) * 1980-05-16 1981-11-26 BHT Hygiene-Technik GmbH, 8000 München Cleaning system for glass chemical vessels - interrupts cleaning-liquid spray long enough for films to break on vessels

Also Published As

Publication number Publication date
FR2611540A1 (en) 1988-09-09
FI884963A0 (en) 1988-10-27
FI85228C (en) 1992-03-25
WO1988006496A1 (en) 1988-09-07
ES2018347B3 (en) 1991-04-01
US4974617A (en) 1990-12-04
EP0287405B1 (en) 1990-10-31
FI85228B (en) 1991-12-13
DE3860916D1 (en) 1990-12-06
FR2611540B1 (en) 1989-06-23
JPH01502566A (en) 1989-09-07
FI884963A (en) 1988-10-27
JP2667892B2 (en) 1997-10-27

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