EP0142424A2 - Variable area mixing nozzle - Google Patents

Variable area mixing nozzle Download PDF

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Publication number
EP0142424A2
EP0142424A2 EP84402165A EP84402165A EP0142424A2 EP 0142424 A2 EP0142424 A2 EP 0142424A2 EP 84402165 A EP84402165 A EP 84402165A EP 84402165 A EP84402165 A EP 84402165A EP 0142424 A2 EP0142424 A2 EP 0142424A2
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EP
European Patent Office
Prior art keywords
sleeve
profile
enclosure
convergent
elastic
Prior art date
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
EP84402165A
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German (de)
French (fr)
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EP0142424A3 (en
EP0142424B1 (en
Inventor
Marc Vital Alexandre Lepretre
Lucien Dominique Balzano
Michel Raymond Caillault
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Bertin Technologies SAS
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Bertin et Cie SA
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Publication date
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Priority to AT84402165T priority Critical patent/ATE28350T1/en
Publication of EP0142424A2 publication Critical patent/EP0142424A2/en
Publication of EP0142424A3 publication Critical patent/EP0142424A3/xx
Application granted granted Critical
Publication of EP0142424B1 publication Critical patent/EP0142424B1/en
Expired legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/48—Control

Definitions

  • the present invention relates to an ejector-mixer with a proboscis effect and is particularly applicable to energy transformers intended for the recompression of gas or soft vapor.
  • thermocompressors are dilution devices in which an energy exchange is carried out between a motor gas (or vapor) and an aspirated gas (or vapor).
  • Thermocompressors being static devices, are very simple and reliable. They are used in particular on evaporators in the food industry to concentrate an aqueous solution and / or suspension (sugar refinery, dairy, distillery, seawater desalination plant, etc.)
  • an ejector comprises a driving nozzle which opens, delivering a flow rate Q I of vapor or gas at a total pressure P 'and a total temperature T', in a steam or gas suction pipe (induced flow Q ", total pressure P" at total temperature T ").
  • This pipe is extended by a mixer where energy is exchanged between the two flows then by a diffuser which transforms the kinetic energy resulting from the flow mixture Q, into a static pressure P at the total temperature T.
  • An improvement of the ejectors has been to replace the single inductor by a plurality of nozzles which thanks to the division of the engine jet improves the quality of the mixture and allows for a given recompression rate to increase the entrainment rate.
  • variable geometry is produced, integrating all or part of the converging, the neck at the outlet of this converging and at least part of the diverging.
  • the initial priming is carried out at a neck dimension greater than or equal to the critical dimension, the neck is then closed until the desired pressure level is obtained allowing passage of the supersonic flow (in the convergent) to subsonic flow (in the divergent) without shock wave formation and with minimization of losses.
  • the part with variable profile advantageously consists of a sleeve or tube of elastic deformable material on which a pressurized fluid is acted controlled by the upstream pressure, the suction pressure or the downstream pressure of the ejector.
  • the deformation of the elastic wall adapts the neck to the conditions of use.
  • the elastic sleeve is subjected to a tension preload by stretching its body, before application of the deformation pressure. It can then be seen that the sleeve, no longer working in buckling as before but in extension, determines a deformation with a harmonious profile recalling the nozzle profile commonly used in aerodynamics (see Figures 3 and 4).
  • the ejector-mixer shown in FIG. 5 comprises a driving nozzle 1 made up of a plurality of inductor nozzles 2 (in this case seven) opening into a duct with a convervent-divergent profile 3 disposed along the axis A-A.
  • This duct 3 comprises upstream a suction sleeve 4 with a highly convergent profile enveloping the nozzle driving 1.
  • the upstream end of this sleeve is in contact with a hollow body 5, which can be connected at 6 to a pipe conveying the induced flow: soft steam for example.
  • the nozzles 2 are fixed to a duct 7 through which they are supplied with inducing fluid, said duct being for this purpose connected, possibly by a strainer 8, to a pipe for supplying the inducing fluid: live steam for example.
  • the diffuser Downstream of the conduit 3, the diffuser consists of a divergent 11 which can be connected to the user member.
  • connection wall between the suction sleeve 4 and the diffuser 11, comprises a substantially cylindrical part 12 followed by a part with low converging taper 13 and finally by a part with variable profile 14.
  • This profile 14 consists (FIG. 6) of a sleeve 15 of elastic deformable material (natural or synthetic rubber, elastomer), housed in a cylindrical casing 16 inserted, with sealing, between adjacent flanges 17 A and 17 B.
  • the enclosure 18 thus formed is supplied with pressurized fluid by means 19 (pipe).
  • the sleeve 15 is extended on either side by two annular flanges 21 and 22 forming an integral part of the sleeve.
  • the supply of fluid under pressure to the enclosure 18 is ensured by a pressure regulator 35 connected to a source of fluid pressure (preferably liquid) by the pipe 36 on the one hand and to the means 19 on the other hand.
  • This regulator 35 is controlled by the upstream driving pressure, the suction pressure or the downstream pressure discharged from the ejector through the conduit 37 connected to a pressure tap disposed in the suction sleeve 4, the mixer or diffuser 11.
  • a change in the upstream, aspirated or downstream reference pressure causes an action on the regulator 35 which acts on the sending of the fluid into the enclosure 18, which has the effect of modifying the internal profile of the sleeve 15, which passes through example of the position shown in full lines in Figure 6 to the position shown in broken lines.
  • one of the end flanges - for example the left flange designated by 21 - is firmly locked in a fixed jaw 40 integral with the casing 16
  • the opposite end flange 22 is firmly gripped in a movable jaw 41 sliding axially in the casing 16 under the action of a jack (not shown) whose rod is seen at 42 and which may be a screw jack.
  • the latter is stretched by moving the movable jaw 41 to the right of the drawing using the jack 42, thereby printing on the sleeve 15 tension preload.
  • the chamber 18 is put back in overpressure to obtain the required converging-diverging sonic neck profile.
  • FIG. 6 shows in 43 such a detector which is seen at 44 a radial feeler finger urged by a spring 45 so that its free end 44 A is in permanent contact with the external surface of the elastic sleeve 15 around its mid-length.

Abstract

A mixer-ejector with jet effect incorporates inductor nozzles opening into a venturi profile conduit having in succession a highly convergent suction sleeve, a coupling wall and a diffuser. The coupling wall is a variable-profile venturi part, consisting of a hollow sleeve made of a distortable elastic material in a casing with leaktight sealing and incorporates means for introducing a fluid into the enclosure formed by the sleeve and the casing.

Description

La présente invention a pour objet un éjecteur-mélangeur à effet de trompe et est particulièrement applicable aux transformateurs d'énergie destinés à la recompression de gaz ou de vapeur molle.The present invention relates to an ejector-mixer with a proboscis effect and is particularly applicable to energy transformers intended for the recompression of gas or soft vapor.

Ces transformateurs, appelés "thermocompresseurs" sont des appareils à dilution dans lequel on réalise un échange d'énergie entre un gaz (ou vapeur) moteur et un gaz (ou vapeur) aspiré.These transformers, called "thermocompressors" are dilution devices in which an energy exchange is carried out between a motor gas (or vapor) and an aspirated gas (or vapor).

Les thermocompresseurs, étant des appareils statiques, sont d'une grande simplicité et fiabilité. Ils sont utilisés notamment sur des évaporateurs dans le domaine agro-alimentaire pour concentrer une solution et/ou suspension aqueuse (sucrerie, laiterie, distillerie, installation de dessalement de l'eau de mer, etc.)Thermocompressors, being static devices, are very simple and reliable. They are used in particular on evaporators in the food industry to concentrate an aqueous solution and / or suspension (sugar refinery, dairy, distillery, seawater desalination plant, etc.)

Initialement, l'usage des éjecteurs se limitait à la réalisation d'appareils simples à faible taux d'entrai- nement (rapport du débit aspiré au débit moteur) pour un faible taux de recompression (rapport de la pression refoulée à la pression aspirée).Initially, the use of ejectors was limited to the production of simple devices with a low drive rate (ratio of suction flow to engine flow) for a low recompression rate (ratio of pumped pressure to suction pressure) .

En général, un éjecteur comporte une tuyère motrice qui débouche, en délivrant un débit QI de vapeur ou de gaz à une pression totale P' et une température totale T', dans une manche d'aspiration de vapeur ou de gaz (débit induit Q", pression totale P" à la température totale T"). Cette manche est prolongée par un mélangeur où s'effectue l'échange d'énergie entre les deux débits puis par un diffuseur qui transforme l'énergie cinétique résultant du mélange de débit Q, en une pression statique P à la température totale T.In general, an ejector comprises a driving nozzle which opens, delivering a flow rate Q I of vapor or gas at a total pressure P 'and a total temperature T', in a steam or gas suction pipe (induced flow Q ", total pressure P" at total temperature T "). This pipe is extended by a mixer where energy is exchanged between the two flows then by a diffuser which transforms the kinetic energy resulting from the flow mixture Q, into a static pressure P at the total temperature T.

Une amélioration des éjecteurs a été de remplacer l'inducteur unique par une pluralité d'ajutages qui grâce à la division du jet moteur améliore la qualité du mélange et permet pour un taux de recompression donnée d'augmenter le taux d'entrainement.An improvement of the ejectors has been to replace the single inductor by a plurality of nozzles which thanks to the division of the engine jet improves the quality of the mixture and allows for a given recompression rate to increase the entrainment rate.

Pour augmenter les capacités de ces éjecteurs, c'est-à-dire d'augmenter le taux de recompression P/P", on a été amené à engendrer à l'entrée du mélangeur un écoulement mélangé supersonique. Cet écoulement est générateur, lors de son passage à une vitesse subsonique, d'une onde choc. La localisation de ce passage doit être judicieusement choisie pour éviter une perte de rendement et même une dégradation du matériel (éjecteur et même récepteur aval).To increase the capacities of these ejectors, that is to say to increase the P / P "recompression rate, it has been necessary to generate at the inlet of the mixer a supersonic mixed flow. This flow is generating, during of its passage at a subsonic speed, of a shock wave. The location of this passage must be judiciously chosen to avoid a loss of output and even degradation of the material (ejector and even downstream receiver).

Aussi a-t-on proposé d'intercaler un convergent-divergent entre le mélangeur et le diffuseur et de créer les conditions pour -que le passage supersonique-subsonique de l'écoulement se fasse au droit du col du convergént-divergent.It has therefore been proposed to insert a convergent-divergent between the mixer and the diffuser and to create the conditions for the supersonic-subsonic passage of the flow to take place at the level of the neck of the convergent-divergent.

Cette disposition permet pour un dimensionnement optimal du col (col sonique), d'assurer une recompression continue sans choc de l'écoulement. Toutefois, ce type d'appareil présente deux difficultés:

  • - le rendement maximum de l'appareil correspond à un diamètre du col inférieur à la dimension critique d'amorçage;
  • - les conditions de fonctionnement peuvent évoluer dans le temps en fonction d'encrassement ou d'impératifs de production; le matériel doit donc présenter une assez large plage d'adaptation.
This arrangement allows for optimal sizing of the neck (sonic neck), to ensure continuous recompression without shock of the flow. However, this type of device presents two difficulties:
  • - the maximum output of the device corresponds to a diameter of the neck less than the critical initiation dimension;
  • - the operating conditions may change over time depending on fouling or imperatives of production; the material must therefore have a fairly wide range of adaptation.

Pour pallier ces inconvénients, on réalise une géométrie variable, intégrant tout ou partie du convergent, le col en sortie de ce convergent et au moins une partie du divergent.To overcome these drawbacks, a variable geometry is produced, integrating all or part of the converging, the neck at the outlet of this converging and at least part of the diverging.

Dans ces conditions l'amorçage initial est effectué à une dimension de col supérieure ou égale à la dimension critique, le col est ensuite refermé jusqu'à obtention du niveau de pression désirée permettant le passage de l'écoulement supersonique (dans le convergent) à l'écoulement subsonique (dans le divergent) sans formation d'onde de choc et avec minimisation des pertes.Under these conditions, the initial priming is carried out at a neck dimension greater than or equal to the critical dimension, the neck is then closed until the desired pressure level is obtained allowing passage of the supersonic flow (in the convergent) to subsonic flow (in the divergent) without shock wave formation and with minimization of losses.

La partie à profil variable est avantageusement constituée d'un manchon ou boudin en matériau déformable élastique sur lequel on fait agir un fluide sous pression piloté par la pression amont, la pression aspirée ou la pression aval de l'éjecteur. La déformation de la paroi élastique adapte le col aux conditions d'utilisation.The part with variable profile advantageously consists of a sleeve or tube of elastic deformable material on which a pressurized fluid is acted controlled by the upstream pressure, the suction pressure or the downstream pressure of the ejector. The deformation of the elastic wall adapts the neck to the conditions of use.

La demanderesse a constaté toutefois que la mise en oeuvre de cette pression externe pour déformer le manchon élastique occasionne, si aucune précaution particulière n'est prise, une section interne frippée d'allure multilobée (voir figures 1 et 2) à lobes plus ou moins prononcés, ce qui est incompatible avec un écoulement aérodynamique homogène.The Applicant has noted, however, that the use of this external pressure to deform the elastic sleeve causes, if no special precautions are taken, an internal section frizzed in multilobed appearance (see Figures 1 and 2) with more or less lobes pronounced, which is incompatible with a homogeneous aerodynamic flow.

Conformément à la présente invention, on soumet le manchon élastique à une précontrainte de tension par étirage de son corps, avant application de la pression déformatrice. On constate alors que le manchon, ne travaillant plus au flambement comme précédemment mais en extension, détermine une déformation à profil harmonieux rappelant le profil de tuyère couramment utilisé en aérodynamique (voir figures 3 et 4).According to the present invention, the elastic sleeve is subjected to a tension preload by stretching its body, before application of the deformation pressure. It can then be seen that the sleeve, no longer working in buckling as before but in extension, determines a deformation with a harmonious profile recalling the nozzle profile commonly used in aerodynamics (see Figures 3 and 4).

La description qui va suivre en regard du dessin annexé, donnée à titre d'exemple non limitatif, fera bien comprendre comment l'invention peut être réalisée, les particularités qui ressortent tant du texte que du dessin faisant, bien entendu, partie de ladite invention.

  • La figure 1 est une vue très schématique en coupe axiale montrant un dispositif classique à manchon élastique déformable par l'exercice d'une pression externe de fluide sous pression.
  • La figure 2 est une vue en coupe transversale par la ligne II-II de la figure 1, montrant une section frippée indésirable.
  • La figure 3 est une vue analogue à la figure 1, illustrant le principe de la présente invention.
  • La figure 4 est une vue en coupe transversale par la ligne IV-IV de la figure 3, montrant une section lisse désirable.
  • La figure 5 est une vue schématique en coupe longitudinale d'un éjecteur-mélangeur aménagé selon la présente invention.
  • Lá figure 6 est une vue en demi-coupe axiale à plus grande échelle illustrant un mode de réalisation préféré de la présente invention.
The description which follows with reference to the appended drawing, given by way of nonlimiting example, will make it clear how the invention can be implemented, the features which emerge both from the text and from the drawing forming, of course, part of said invention .
  • Figure 1 is a very schematic view in axial section showing a conventional device with elastic sleeve deformable by the exercise of external pressure of pressurized fluid.
  • Figure 2 is a cross-sectional view through line II-II of Figure 1, showing an undesirable crumpled section.
  • Figure 3 is a view similar to Figure 1, illustrating the principle of the present invention.
  • Figure 4 is a cross-sectional view through the line IV-IV of Figure 3, showing a desirable smooth section.
  • Figure 5 is a schematic view in longitudinal section of an ejector-mixer arranged according to the present invention.
  • Figure 6 is an enlarged axial half-section view illustrating a preferred embodiment of the present invention.

L'éjecteur-mélangeur représenté sur la figure 5 comporte une tuyère motrice 1 constituée d'une pluralité d'ajutages inducteurs 2 (en l'espèce sept) débouchant dans un conduit à profil convervent-divergent 3 disposé suivant l'axe A-A.The ejector-mixer shown in FIG. 5 comprises a driving nozzle 1 made up of a plurality of inductor nozzles 2 (in this case seven) opening into a duct with a convervent-divergent profile 3 disposed along the axis A-A.

Ce conduit 3 comporte en amont une manche d'aspiration 4 à profil fortement convergent enveloppant la tuyère motrice 1. L'extrémité amont de cette manche est en contact avec un corps creux 5, pouvant être raccordé en 6 à une canalisation véhiculant le débit induit: de la vapeur molle par exemple.This duct 3 comprises upstream a suction sleeve 4 with a highly convergent profile enveloping the nozzle driving 1. The upstream end of this sleeve is in contact with a hollow body 5, which can be connected at 6 to a pipe conveying the induced flow: soft steam for example.

Les ajutages 2 sont fixés à un conduit 7 par lequel ils sont alimentés en fluide inducteur, ledit conduit étant à cet effet raccordé, par éventuellement une crépine 8, à une canalisation d'amenée du fluide inducteur: de la vapeur vive par exemple.The nozzles 2 are fixed to a duct 7 through which they are supplied with inducing fluid, said duct being for this purpose connected, possibly by a strainer 8, to a pipe for supplying the inducing fluid: live steam for example.

En aval du conduit 3, le diffuseur est constitué d'un divergent 11 qui peut être raccordé à l'organe utilisateur.Downstream of the conduit 3, the diffuser consists of a divergent 11 which can be connected to the user member.

La paroi de raccordement,entre la manche d'aspiration 4 et le diffuseur 11, comprend une partie sensiblement cylindrique 12 suivie d'une partie à faible conicité convergente 13 et enfin d'une partie à profil variable 14.The connection wall, between the suction sleeve 4 and the diffuser 11, comprises a substantially cylindrical part 12 followed by a part with low converging taper 13 and finally by a part with variable profile 14.

Ce profil 14 est constitué (figure 6) d'un manchon 15 en matériau déformable élastique (caoutchouc naturel ou synthétique, élastomère), logé dans un carter cylindrique 16 inséré, avec étanchéité, entre des brides adjacentes 17 A et 17 B. L'enceinte 18 ainsi formée est alimentée en fluide sous pression par des moyens 19 (canalisation).This profile 14 consists (FIG. 6) of a sleeve 15 of elastic deformable material (natural or synthetic rubber, elastomer), housed in a cylindrical casing 16 inserted, with sealing, between adjacent flanges 17 A and 17 B. The enclosure 18 thus formed is supplied with pressurized fluid by means 19 (pipe).

Le manchon 15 se prolonge de part et d'autre par deux collerettes annulaires 21 et 22 faisant partie intégrante du manchon.The sleeve 15 is extended on either side by two annular flanges 21 and 22 forming an integral part of the sleeve.

L'alimentation en fluide sous pression de l'enceinte 18 est assurée par un régulateur de pression 35 raccordé à une source de pression de fluide (liquide de préférence) par la canalisation 36 d'une part et aux moyens 19 d'autre part. Ce régulateur 35 est commandé par la pression amont motrice, la pression aspirée ou la pression aval refoulée de l'éjecteur grâce au conduit 37 relié à une prise de pression disposée dans le manchon d'aspiration 4, le mélangeur ou le diffuseur 11.The supply of fluid under pressure to the enclosure 18 is ensured by a pressure regulator 35 connected to a source of fluid pressure (preferably liquid) by the pipe 36 on the one hand and to the means 19 on the other hand. This regulator 35 is controlled by the upstream driving pressure, the suction pressure or the downstream pressure discharged from the ejector through the conduit 37 connected to a pressure tap disposed in the suction sleeve 4, the mixer or diffuser 11.

Un changement de la pression de référence amont, aspirée ou aval provoque une action sur le régulateur 35 qui agit sur l'envoi du fluide dans l'enceinte 18, ce qui a pour effet de modifier le profil intérieur du manchon 15, qui passe par exemple de la position représentée en traits pleiœ sur la figure 6 à la position représentée en traits mixtes.A change in the upstream, aspirated or downstream reference pressure causes an action on the regulator 35 which acts on the sending of the fluid into the enclosure 18, which has the effect of modifying the internal profile of the sleeve 15, which passes through example of the position shown in full lines in Figure 6 to the position shown in broken lines.

Pour en revenir au mode de réalisation préféré de la présente invention, représenté sur la figure 6, on notera que l'une des collerettes terminales - par exemple celle de gauche désignée par 21 - est bloquée fermement dans une mâchoire fixe 40 solidaire du carter 16, tandis que la collerette terminale opposée 22 est saisie fermement dans une mâchoire mobile 41 coulissant axialement dans le carter 16 sous l'action d'un vérin (non représenté) dont on voit la tige en 42 et qui peut être un vérin à vis.To return to the preferred embodiment of the present invention, represented in FIG. 6, it will be noted that one of the end flanges - for example the left flange designated by 21 - is firmly locked in a fixed jaw 40 integral with the casing 16 , while the opposite end flange 22 is firmly gripped in a movable jaw 41 sliding axially in the casing 16 under the action of a jack (not shown) whose rod is seen at 42 and which may be a screw jack.

Conformément à la présente invention, avant la mise en pression de l'enceinte 18 entourant le manchon élastique 15, on étire ce dernier en déplaçant la mâchoire mobile 41 vers la droite du dessin à l'aide du vérin 42, imprimant ainsi au manchon 15 une précontrainte de tension.In accordance with the present invention, before the enclosure 18 surrounding the elastic sleeve 15 is pressurized, the latter is stretched by moving the movable jaw 41 to the right of the drawing using the jack 42, thereby printing on the sleeve 15 tension preload.

Or on peut constater, qu'au départ, lors de cet étirage, il se produit un rétrécissement de section à mi-longueur du manchon 15, ce qui risque d'être néfaste à l'écoulement d'origine du fluide dans celui-ci. On pallie cet état de chose par la mise en dépression de l'enceinte externe 18 par branchement du canal 19 sur une source de vide (non représentée). On rétablit ainsi le profil cylindrique du manchon 15.However, it can be seen that at the start, during this stretching, there is a narrowing of the section at mid-length of the sleeve 15, which is likely to be harmful to the original flow of the fluid therein. . This state of affairs is overcome by placing the external enclosure 18 under vacuum by connecting the channel 19 to a vacuum source (not shown). The cylindrical profile of the sleeve 15 is thus restored.

En fonctionnement, on remet en surpression l'enceinte 18 pour obtenir le profil convergent-divergent à col sonique requis.In operation, the chamber 18 is put back in overpressure to obtain the required converging-diverging sonic neck profile.

Toutes ces manoeuvres peuvent se faire automatiquement par pilotage à l'aide d'un détecteur adéquat de section de col du manchon élastique 15. On a représenté sur la figure 6 en 43 un tel détecteur dont on voit en 44 un doigt palpeur radial sollicité par un ressort 45 pour que son extrémité libre 44 A soit en contact permanent avec la surface externe du manchon élastique 15 aux environs de sa mi-longueur.All these maneuvers can be carried out automatically by piloting with the aid of a suitable detector for the section of the neck of the elastic sleeve 15. FIG. 6 shows in 43 such a detector which is seen at 44 a radial feeler finger urged by a spring 45 so that its free end 44 A is in permanent contact with the external surface of the elastic sleeve 15 around its mid-length.

Claims (4)

1. Procédé de mise en oeuvre d'un éjecteur-mélangeur à effet de trompe du type comportant un ou plusieurs ajutages inducteurs (2) débouchant dans un conduit convergent-divergent (3) comportant successivement une manche d'aspiration (4) fortement convergente, une partie intermédiaire convergente-divergente à profil variable (14) constituée d'un manchon (15) en matériau déformable élastique logé avec étanchéité dans un carter (16) qui détermine avec le manchon (15) une enceinte (18) entourant ce dernier, et un diffuseur (11), caractérisé en ce qu'on soumet le manchon élastique (15) à une précontrainte de tension par étirage de son corps, avant application d'une surpression dans l'enceinte (18) pour lui conférer le profil convergent-divergent voulu.1. Method for implementing a trumpet-type ejector-mixer comprising one or more inductor nozzles (2) opening into a convergent-divergent duct (3) successively comprising a highly convergent suction sleeve (4) , a variable-profile converging-diverging intermediate part (14) consisting of a sleeve (15) of elastic deformable material housed with sealing in a casing (16) which determines with the sleeve (15) an enclosure (18) surrounding the latter , and a diffuser (11), characterized in that the elastic sleeve (15) is subjected to a tension preload by stretching its body, before application of an overpressure in the enclosure (18) to give it the profile convergent-divergent wanted. 2. Procédé selon la revendication 1, caractérisé en ce que, le manchon élastique (15) ayant au repos un profil quasi cylindrique, on met au départ l'enceinte (18) en dépression pour conserver ce profil quasi cylindrique nonobstant l'étirage du manchon (15), après quoi, en cours de fonctionnement, on remet en surpression l'enceinte (18) pour réaliser le profil convergent-divergent voulu.2. Method according to claim 1, characterized in that, the elastic sleeve (15) having at rest a quasi-cylindrical profile, the enclosure (18) is initially placed under vacuum to maintain this quasi-cylindrical profile notwithstanding the stretching of the sleeve (15), after which, during operation, the enclosure (18) is brought back into overpressure to produce the desired convergent-diverging profile. 3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'une des extrémités (21) du manchon élastique (15) est bloquée en position, l'étirage étant effectué en en éloignant l'autre extrémité (22).3. Method according to claim 1 or 2, characterized in that one of the ends (21) of the elastic sleeve (15) is locked in position, the stretching being carried out by moving the other end away (22). 4. Procédé selon la revendication 1, 2 ou 3, caractérisé en ce qu'on pilote la pression dans l'enceinte (18) à partir d'une détection (44) de section du corps du manchon élastique (15) à peu près à mi-longueur de celui-ci.4. Method according to claim 1, 2 or 3, characterized in that the pressure is controlled in the enclosure (18) from a detection (44) of section of the body of the elastic sleeve (15) approximately. mid-length of it.
EP84402165A 1983-11-10 1984-10-29 Variable area mixing nozzle Expired EP0142424B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84402165T ATE28350T1 (en) 1983-11-10 1984-10-29 MIXING JET PUMP WITH VARIABLE AVERAGE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8317869A FR2554874B1 (en) 1983-11-10 1983-11-10 VARIABLE SECTION TRUMP EJECTOR AND MIXER AND APPLICATION
FR8317869 1983-11-10

Publications (3)

Publication Number Publication Date
EP0142424A2 true EP0142424A2 (en) 1985-05-22
EP0142424A3 EP0142424A3 (en) 1985-06-19
EP0142424B1 EP0142424B1 (en) 1987-07-15

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Family Applications (1)

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EP84402165A Expired EP0142424B1 (en) 1983-11-10 1984-10-29 Variable area mixing nozzle

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US (1) US4586873A (en)
EP (1) EP0142424B1 (en)
AT (1) ATE28350T1 (en)
DE (1) DE3464787D1 (en)
FR (1) FR2554874B1 (en)

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FR2632688A1 (en) * 1988-06-10 1989-12-15 Entrepose Montalev Ejector
CN102072209A (en) * 2009-11-24 2011-05-25 J.施迈茨有限公司 Vacuum generator operated by pressurised air
EP3517856A1 (en) * 2017-12-20 2019-07-31 Lennox Industries Inc. Method and apparatus for refrigerant detector calibration confirmation

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DK158109C (en) * 1988-02-04 1990-08-20 Dems Eng ADJUSTABLE EJECTOR
US4877053A (en) * 1988-04-05 1989-10-31 Whitey Co. Pinch valve
US4800920A (en) * 1988-04-05 1989-01-31 Whitey Co. Pinch valve
US4899783A (en) * 1988-09-30 1990-02-13 Whitey Co. Pinch valve
US4938245A (en) * 1989-09-25 1990-07-03 Fluidmaster, Inc. Low noise toilet tank valve
AU7239491A (en) * 1990-01-17 1991-08-05 Helios Research Corp. Silencer system for hydrokinetic amplifier
US5326468A (en) * 1992-03-02 1994-07-05 Cox Dale W Water remediation and purification method and apparatus
US6079628A (en) * 1994-04-06 2000-06-27 Kenny; Thomas M. Self-contained temperature and pressure operated pinch valve
IL122396A0 (en) * 1997-12-02 1998-06-15 Pekerman Oleg Method of heating and/or homogenizing of liquid products in a steam-liquid injector
FR2788109B1 (en) * 1998-12-30 2001-06-08 Total Raffinage Distribution DEVICE FOR IMPROVING THE BURNING OF GASEOUS FUELS
US6877960B1 (en) * 2002-06-05 2005-04-12 Flodesign, Inc. Lobed convergent/divergent supersonic nozzle ejector system
US8505310B2 (en) * 2008-10-22 2013-08-13 General Electric Company Gas turbine ejector and method of operation
US8794902B1 (en) 2010-01-26 2014-08-05 II Daniel K. Van Ness System and method to improve the exhaust pressure across a RAM air turbine through secondary flow mixing
US8480361B1 (en) * 2010-01-26 2013-07-09 Mainstream Engineering Corporation Enhanced system and method to increase the total-to-static pressure ratio across a RAM air turbine using surface contoured flow agitators
CN102865258B (en) * 2012-10-17 2015-10-07 南通赛孚机械设备有限公司 A kind of low-energy consumption steam jet vacuum pump
CN108884839B (en) * 2016-04-01 2020-03-31 蒂埃尔威有限公司 Ejector, method for manufacturing ejector, and method for setting outlet flow path of diffuser
EP3438465B1 (en) * 2016-04-01 2020-04-01 TLV Co., Ltd. Ejector, ejector production method, and method for setting diffuser outlet flow path
DE102017124699A1 (en) * 2017-10-23 2019-04-25 Avl Emission Test Systems Gmbh Exhaust gas sampling system
CN108672123B (en) * 2018-07-06 2021-01-19 西安交通大学 Ejector with adjustable mixing chamber throat area
CN109738032A (en) * 2019-03-14 2019-05-10 湖南大麓科技有限公司 A kind of pipeline flow measurement device and method

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US3891353A (en) * 1972-03-09 1975-06-24 British Gas Corp Jet boosters
US3942724A (en) * 1974-08-01 1976-03-09 S.R.C. Laboratories, Inc. Variable throat nozzle

Cited By (7)

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FR2632688A1 (en) * 1988-06-10 1989-12-15 Entrepose Montalev Ejector
CN102072209A (en) * 2009-11-24 2011-05-25 J.施迈茨有限公司 Vacuum generator operated by pressurised air
EP2333350A1 (en) * 2009-11-24 2011-06-15 J. Schmalz GmbH Vacuum generator operated by pressurised air
US8596990B2 (en) 2009-11-24 2013-12-03 J. Schmalz Gmbh Pneumatic vacuum generator
EP3517856A1 (en) * 2017-12-20 2019-07-31 Lennox Industries Inc. Method and apparatus for refrigerant detector calibration confirmation
US10760838B2 (en) 2017-12-20 2020-09-01 Lennox Industries Inc. Method and apparatus for refrigerant detector calibration confirmation
US11378313B2 (en) 2017-12-20 2022-07-05 Lennox Industries Inc. Method and apparatus for refrigerant detector calibration confirmation

Also Published As

Publication number Publication date
FR2554874A1 (en) 1985-05-17
EP0142424A3 (en) 1985-06-19
ATE28350T1 (en) 1987-08-15
EP0142424B1 (en) 1987-07-15
US4586873A (en) 1986-05-06
FR2554874B1 (en) 1988-04-15
DE3464787D1 (en) 1987-08-20

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