EP0581636B1 - Flow rectifier for an expansion station and a metering device - Google Patents

Flow rectifier for an expansion station and a metering device Download PDF

Info

Publication number
EP0581636B1
EP0581636B1 EP19930401809 EP93401809A EP0581636B1 EP 0581636 B1 EP0581636 B1 EP 0581636B1 EP 19930401809 EP19930401809 EP 19930401809 EP 93401809 A EP93401809 A EP 93401809A EP 0581636 B1 EP0581636 B1 EP 0581636B1
Authority
EP
European Patent Office
Prior art keywords
flow rectifier
rectifier
flow
rectifier according
main section
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.)
Expired - Lifetime
Application number
EP19930401809
Other languages
German (de)
French (fr)
Other versions
EP0581636A1 (en
Inventor
Luc Ogez
Jérôme Deye
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Itron Soluciones de Medida Espana SA
Schlumberger SA
Original Assignee
Itron Soluciones de Medida Espana SA
Schlumberger SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Itron Soluciones de Medida Espana SA, Schlumberger SA filed Critical Itron Soluciones de Medida Espana SA
Publication of EP0581636A1 publication Critical patent/EP0581636A1/en
Application granted granted Critical
Publication of EP0581636B1 publication Critical patent/EP0581636B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B7/00—Water main or service pipe systems
    • E03B7/09—Component parts or accessories
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B7/00—Water main or service pipe systems
    • E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
    • E03B7/072—Arrangement of flowmeters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/02—Influencing flow of fluids in pipes or conduits

Definitions

  • the present invention relates to a flow rectifier. She applies in particular to fluid flow conditioning before counting this flow. She finds an application particularly advantageous in a relaxation and counting.
  • rectifiers we know different types. The simplest of them is formed by a flat plate adapted to dimensions of the pipe in which the fluid circulates and pierced with holes allowing the flow.
  • this plate can be pierced with an orifice central of larger diameter than the holes and not modifying not the velocity profile near the flow axis.
  • the rectifier is composed of a first plate pierced with holes.
  • This first plaque has a smaller diameter than the pipe for which the rectifier is designed.
  • the first plate is attached by a cylinder to a crown having a diameter outside equal to the diameter of the pipe for which the rectifier is designed. This crown is pierced with holes in the same way as the first plate.
  • a relaxation station is composed of a large number of elements (filters, pressure reduction chamber, control valves, counter ). For reasons practical, we seek to reduce the total size.
  • the rectifier itself may be a few D in length, which further adds to the overall size.
  • the present invention overcomes these drawbacks.
  • the size of the device is reduced because the straightening of the speed profile can be obtained directly after the fluid has passed through the rectifier and on the other hand, found that the measurement accuracy of meters, especially but not only turbine meters, is improved compared to the situation anterior.
  • a flow rectifier according to the invention also has the advantage of be able to operate with the same efficiency regardless of direction fluid inlet.
  • the flux rectifier according to the invention can as well be placed in a straight pipe only at the end of an elbow.
  • the present invention relates to a flow straightener comprising a main part intended to be placed upstream, this part having a surface with symmetry of revolution around a central axis, according to claim 1.
  • the main part may be truncated.
  • the main truncated part has one end closed by a circular plate pierced with holes.
  • the main part is surrounded by a crown pierced with holes.
  • the main part has a longitudinal extension included in a range from 0.6 D to 2.8 D, D being the largest diameter of the rectifier.
  • the main part is cone-shaped.
  • the cone has a circular base of diameter adapted to the diameter of a pipe in which the rectifier is intended to be mounted.
  • the cone has a generator making an angle with the central axis in a range from 10 ° to 40 °.
  • a flow rectifier according to the invention has a void rate in a range from 30% to 50%.
  • the present invention also relates to a relaxation station and metering system including a flow rectifier in accordance with minus one of the characteristics described above, the rectifier being mounted upstream and in the immediate vicinity counting means.
  • the flow rectifier 10 is fixed between two cylindrical pipes 12, 13 by a crown of peripheral attachment 14.
  • the rectifier 10 has a main part 16 placed upstream.
  • This main part 16 has a surface with symmetry of revolution around the central axis A. The surface is generated by a curve with re-entrant curvature relative to the central axis A, this curve passing through a fixed point on the central axis AT.
  • the longitudinal extension L of the main part 16 is for example in a range from 0.6 D to 2.8 D where D is the diameter of the pipe 13 and therefore corresponds to the largest diameter of the rectifier. It may be equal to 1.3 D.
  • the rectifier is pierced with holes 17 to allow the passage of the fluid.
  • the void rate that is to say the percentage of void space relative to the space occupied by the material, is for example comprised in a range going from 30% to 50%.
  • the vacuum rate may be equal to 40%.
  • the rectifier 10 may be made of steel or any other rigid material and compatible with the fluid. As can be understood from the view in FIG. 1A, the flow rectifier makes it possible to obtain an axisymmetric speed profile such that the volume flow rate of fluid in the vicinity of the central axis A is greater than the peripheral volume flow rate and this from any speed profile.
  • the shape of the main part concentrates the speed profile in the central zone in the vicinity of the axis A maintaining the rate of turbulence in the vicinity of the central axis of the order of 4%.
  • the fluid crosses the main part and acquires, as it passes, velocity components perpendicular to the wall crossed, which achieves the desired effect at a distance downstream of the rectifier which depends on the geometric parameters of the main part such as the curvature of the surface and the inclination of a generator with respect to the axis A.
  • the main part 16 is truncated.
  • the end therefore has an opening 15 whose diameter d is at most 30% of the diameter D of the pipe 13.
  • the main part 16 is truncated and closed by a circular plate 18 whose diameter d is at most equal to 30% of the diameter D of the pipe. 13.
  • the choice of the diameter d is made according to the desired speed profile: the larger the diameter d, the more the profile will be flattened.
  • the base of the main part 16 is surrounded by a crown 20 pierced with holes.
  • the crown 20 can have a width I included in a range from 0 D to 1/3 D. It allows to increase the efficiency of the rectifier in the vicinity of walls: The pressure drop is sharp and therefore the fluid speed is decreased.
  • FIGS. 5A and 5B respectively show in section and in perspective an advantageous embodiment because it is simple to carry out.
  • the main part 16 of the rectifier has the shape of a cone.
  • the angle a that a cone generator makes with the central axis A is in a range from 10 ° to 40 ° and can for example be equal to 20 °.
  • the longitudinal extension of the cone is equal to ⁇ 1.4 D, the circular base of the cone having a diameter equal to D.
  • the void rate of the holey plate forming the cone can be 40%.
  • the cone shape of FIG. 5A can be associated with the variants of FIGS.
  • the cone can be truncated, and possibly closed at its end by a flat plate with holes or the base circular of the cone may have a diameter less than D, the cone being integral with a perforated peripheral crown.
  • a flow rectifier according to the invention in one or other of its variant embodiments finds an advantageous application in an expansion and counting station and in particular when the counting means are constituted by a turbine meter.
  • FIG. 6 schematically represents an expansion and counting station.
  • a station is made up of a set of elements connected together by pipes in configurations which depend on the intended use.
  • the station is constituted by the following succession of elements given in the direction of circulation of the fluid: an electrical insulating joint 30, a first valve 32, a filter 34, the regulator 36, the flow rectifier 10, the counter 38, and a second valve 40.
  • the flow rectifier 10 is a cone. In this particular configuration, the rectifier is arranged in a direction perpendicular to the direction of arrival of the flow. The rectifier is placed in the immediate vicinity of the counter 38, that is to say at a distance of less than 0.5 D.
  • Such a configuration makes it possible to reduce the size of the station since the rectification takes place directly downstream of the rectifier 10 and not after the fluid has traveled a distance of a few D.
  • the combination of a rectifier as described above and a counter, for example with a turbine makes it possible to obtain an accuracy of 0 to 0.5% on the counting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measuring Volume Flow (AREA)
  • Details Of Flowmeters (AREA)

Description

La présente invention a pour objet un redresseur de flux. Elle s'applique notamment à un conditionnement de flux de fluide avant le comptage de ce flux. Elle trouve une application particulièrement avantageuse dans un poste de détente et de comptage.The present invention relates to a flow rectifier. She applies in particular to fluid flow conditioning before counting this flow. She finds an application particularly advantageous in a relaxation and counting.

On connait différents types de redresseurs. Le plus simple d'entre eux est formé par une plaque plane adaptée aux dimensions de la canalisation dans laquelle circule le fluide et percée de trous permettant l'écoulement.We know different types of rectifiers. The simplest of them is formed by a flat plate adapted to dimensions of the pipe in which the fluid circulates and pierced with holes allowing the flow.

En variante, cette plaque peut être percée d'un orifice central de plus grand diamètre que les trous et ne modifiant pas le profil de vitesse aux abords de l'axe d'écoulement.As a variant, this plate can be pierced with an orifice central of larger diameter than the holes and not modifying not the velocity profile near the flow axis.

Dans une autre variante connue, le redresseur est composé d'une première plaque percée de trous. Cette première plaque possède un diamètre inférieur à celui de la canalisation pour laquelle le redresseur est conçu. La première plaque est rattachée par un cylindre à une couronne ayant un diamètre extérieur égal au diamètre de la canalisation pour laquelle le redresseur est conçu. Cette couronne est percée de trous de la même manière que la première plaque.In another known variant, the rectifier is composed of a first plate pierced with holes. This first plaque has a smaller diameter than the pipe for which the rectifier is designed. The first plate is attached by a cylinder to a crown having a diameter outside equal to the diameter of the pipe for which the rectifier is designed. This crown is pierced with holes in the same way as the first plate.

On connait aussi un autre type de redresseur dit "en nid d'abeille" composé de polygones jointifs placés longitudinalement dans la canalisation. La longueur de ces polygones n'est pas obligatoirement identique pour tous les polygones du redresseur. Le choix des différentes longueurs des polygones et de leur distribution permet d'obtenir le profil de vitesse désiré.We also know another type of rectifier called "nest" bee "composed of contiguous polygons placed longitudinally in the pipeline. The length of these polygons need not be identical for all rectifier polygons. The choice of different lengths polygons and their distribution provides the desired speed profile.

Tous ces dispositifs connus présentent des inconvénients. Le principal de ces inconvénients consiste dans le fait que le profil de vitesse n'est redressé qu'au bout d'une distance qui peut être de quelques D, où D est le diamètre de la canalisation d'accueil. Ceci implique une augmentation d'encombrement, ce qui est particulièrement génant quand le redressement doit avoir lieu dans un poste de détente.All of these known devices have drawbacks. The main drawback is that the speed profile is only straightened after a distance which can be a few D, where D is the diameter of the reception pipeline. This implies an increase in size, which is particularly annoying when the recovery must take place in a position of relaxation.

En effet, un poste de détente est composé d'un grand nombre d'éléments (filtres, chambre de détente, vannes de contrôle, compteur...). Pour des raisons pratiques, on recherche à en diminuer l'encombrement total.Indeed, a relaxation station is composed of a large number of elements (filters, pressure reduction chamber, control valves, counter ...). For reasons practical, we seek to reduce the total size.

De plus, dans le cas d'un redresseur en nid d'abeille, le redresseur lui même peut présenter une longeur de quelques D, ce qui ajoute encore à l'encombrement de l'ensemble.In addition, in the case of a honeycomb rectifier, the rectifier itself may be a few D in length, which further adds to the overall size.

Un autre inconvénient majeur est constitué par le fait que les compteurs placés dans les postes de détente et situés en aval des redresseurs de l'art antérieur perdent leur précision. C'est ainsi que la précision d'un compteur usuel dans un poste de détente sans redresseur est diminuée d'environ 4%; avec un redresseur de l'art antérieur placé en aval, la précision est diminuée d'environ 1%. Cette perte de précision dépend de paramètres comme calibre du compteur et le débit.Another major drawback is that the meters placed in expansion stations and located downstream of the rectifiers of the prior art lose their precision. This is how the accuracy of a standard counter in a expansion station without rectifier is reduced by approximately 4%; with a rectifier of the prior art placed downstream, the precision is reduced by approximately 1%. This loss of accuracy depends on parameters such as meter caliber and debit.

On connait le brevet français FR 2 260 706 qui décrit un collecteur de jet comportant une embase sur laquelle sont montés des écrans poreux dont l'angle d'inclinaison avec la direction d'écoulement du fluide décroit d'amont en aval, l'écoulement du fluide étant dévié vers les parois de la canalisation dans laquelle le collecteur est installé.We know the French patent FR 2 260 706 which describes a jet collector comprising a base on which porous screens are mounted whose angle inclination with the direction of flow of the fluid decreases from upstream to downstream, the flow of the fluid being diverted towards the walls of the pipeline in which the collector is installed.

Toutefois, un tel dispositif ne permet pas de pallier les inconvénients visés ci-dessus.However, such a device does not overcome the drawbacks mentioned above.

La présente invention pallie ces inconvénients. D'une part, l'encombrement du dispositif est réduit car le redressement du profil de vitesse peut être obtenu directement après le passage du fluide par le redresseur et d'autre part, on a constaté que la précision de mesure des compteurs, notamment mais pas uniquement des compteurs à turbine, est améliorée par rapport à la situation antérieure.The present invention overcomes these drawbacks. On the one hand, the size of the device is reduced because the straightening of the speed profile can be obtained directly after the fluid has passed through the rectifier and on the other hand, found that the measurement accuracy of meters, especially but not only turbine meters, is improved compared to the situation anterior.

Un redresseur de flux conforme à l'invention présente aussi l'avantage de pouvoir fonctionner avec le même efficacité quelle que soit la direction d'arrivée du fluide.A flow rectifier according to the invention also has the advantage of be able to operate with the same efficiency regardless of direction fluid inlet.

En d'autres termes, le redresseur de flux conforme à l'invention peut aussi bien être placé dans une canalisation droite qu'à la sortie d'un coude. In other words, the flux rectifier according to the invention can as well be placed in a straight pipe only at the end of an elbow.

De manière plus précise, la présente invention concerne un redresseur de flux comprenant une partie principale destinée à être placée vers l'amont, cette partie possédant une surface à symétrie de révolution autour d'un axe central, selon la revendication 1.More specifically, the present invention relates to a flow straightener comprising a main part intended to be placed upstream, this part having a surface with symmetry of revolution around a central axis, according to claim 1.

La partie principale peut-être tronquée. En variante, la partie principale tronquée possède une extrémité fermée par une plaque circulaire percée de trous.
Selon un arrangement particulier, la partie principale est entourée d'une couronne percée de trous.The main part may be truncated. Alternatively, the main truncated part has one end closed by a circular plate pierced with holes.
According to a particular arrangement, the main part is surrounded by a crown pierced with holes.

De manière avantageuse, la partie principale possède une extension longitudinale comprise dans une gamme allant de 0,6 D à 2,8 D, D étant le plus grand diamètre du redresseur.Advantageously, the main part has a longitudinal extension included in a range from 0.6 D to 2.8 D, D being the largest diameter of the rectifier.

De manière préférée, la partie principale est en forme de cône.
Dans cette réalisation préférée, selon un arrangement particulier, le cône possède une base circulaire de diamètre adapté au diamètre d'une conduite dans laquelle le redresseur est destiné à être monté.Preferably, the main part is cone-shaped.
In this preferred embodiment, according to a particular arrangement, the cone has a circular base of diameter adapted to the diameter of a pipe in which the rectifier is intended to be mounted.

Avantageusement, le cône possède une génératrice faisant avec l'axe centrale un angle compris dans une gamme allant de 10° à 40°.
Préférentiellement, un redresseur de flux selon l'invention possède un taux de vide compris dans une gamme allant de 30% à 50%.Advantageously, the cone has a generator making an angle with the central axis in a range from 10 ° to 40 °.
Preferably, a flow rectifier according to the invention has a void rate in a range from 30% to 50%.

La présente invention concerne aussi un poste de détente et de comptage comprenant un redresseur de flux conforme à au moins une des caractéristiques précédemment exposées, le redresseur étant monté en amont et à proximité immédiate des moyens de comptage.The present invention also relates to a relaxation station and metering system including a flow rectifier in accordance with minus one of the characteristics described above, the rectifier being mounted upstream and in the immediate vicinity counting means.

L'invention et ses avantages seront mieux compris à la lecture de la description qui suit, donnée à titre illustratif et non limitatif, en référence aux dessins annexés sur lesquels:

  • les figures 1A et 1B représentent respectivement une vue en coupe et en perspective d'un mode de réalisation d'un dispositif conforme à l'invention;
  • les figures 2A et 2B représentent respectivement une vue en coupe et en perspective d'une variante de réalisation d'un redresseur de flux selon l'invention;
  • les figures 3A et 3B représentent respectivement une vue en coupe et en perspective d'une autre variante de réalisation d'un redresseur de flux selon l'invention;
  • les figures 4A et 4B représentent respectivement une vue en coupe et en perspective d'une autre variante de réalisation d'un redresseur de flux conforme à l'invention;
  • les figures 5A et 5B représentent respectivement une vue en coupe et en perspective d'une autre variante de réalisation d'un redresseur de flux conforme à l'invention;
  • la figure 6 représente schématiquement un poste de détente et de comptage conforme à l'invention.
Sur la figure 1A on peut voir une coupe d'un mode de réalisation d'un redresseur de flux conforme à l'invention.The invention and its advantages will be better understood on reading the description which follows, given by way of illustration and not limitation, with reference to the appended drawings in which:
  • FIGS. 1A and 1B respectively represent a sectional and perspective view of an embodiment of a device according to the invention;
  • FIGS. 2A and 2B respectively represent a sectional and perspective view of an alternative embodiment of a flux rectifier according to the invention;
  • FIGS. 3A and 3B respectively represent a sectional and perspective view of another alternative embodiment of a flux rectifier according to the invention;
  • FIGS. 4A and 4B respectively represent a sectional and perspective view of another alternative embodiment of a flux rectifier according to the invention;
  • FIGS. 5A and 5B respectively represent a sectional and perspective view of another alternative embodiment of a flux rectifier according to the invention;
  • FIG. 6 diagrammatically represents an expansion and counting station in accordance with the invention.
In Figure 1A we can see a section of an embodiment of a flow rectifier according to the invention.

Cette réalisation est représenté en perspective sur la figure 1B. Le redresseur de flux 10 est fixé entre deux canalisations cylindriques 12, 13 par une couronne de fixation périphérique 14.This achievement is shown in perspective in the figure 1B. The flow rectifier 10 is fixed between two cylindrical pipes 12, 13 by a crown of peripheral attachment 14.

Le redresseur 10 possède une partie principale 16 placée vers l'amont. Cette partie principale 16 possède une surface à symétrie de révolution autour de l'axe central A. La surface est engendrée par une courbe à courbure rentrante par rapport à l'axe central A, cette courbe passant par un point fixe sur l'axe central A.
L'extension longitudinale L de la partie principale 16, est par exemple comprise dans une gamme allant de 0,6 D à 2,8 D où D est le diamètre de la conduite 13 et correspond par conséquent au plus grand diamètre du redresseur. Elle peut-être égale à 1,3 D.
Comme on peut le voir sur la figure 1B, le redresseur est percé de trous 17 pour permettre le passage du fluide. Le taux de vide, c'est à dire le pourcentage d'espace vide par rapport à l'espace occupé par de la matière, est par exemple compris dans une gamme allant de 30% à 50%. Le taux de vide peut-être égal à 40%.
Le redresseur 10 peut-être en acier ou en tout autre matériau rigide et compatible avec le fluide.
Comme on le comprend à la vue de la figure 1A, le redresseur de flux permet d'obtenir un profil de vitesse axisymétrique tel que le débit volumique de fluide au voisinage de l'axe central A soit supérieur au débit volumique périphérique et ceci à partir d'un profil de vitesse quelconque.
La forme de la partie principale concentre le profil de vitesse dans la zone centrale au voisinage de l'axe A maintenant le taux de turbulence au voisinage de l'axe central de l'ordre de 4%. Le fluide traverse la partie principale et acquiert au passage des composantes de vitesse perpendiculaires à la paroi traversée, ce qui réalise l'effet recherché à une distance en aval du redresseur qui dépend des paramètres géométriques de la partie principale comme la courbure de la surface et l'inclinaison d'une génératrice par rapport à l'axe A.The rectifier 10 has a main part 16 placed upstream. This main part 16 has a surface with symmetry of revolution around the central axis A. The surface is generated by a curve with re-entrant curvature relative to the central axis A, this curve passing through a fixed point on the central axis AT.
The longitudinal extension L of the main part 16 is for example in a range from 0.6 D to 2.8 D where D is the diameter of the pipe 13 and therefore corresponds to the largest diameter of the rectifier. It may be equal to 1.3 D.
As can be seen in FIG. 1B, the rectifier is pierced with holes 17 to allow the passage of the fluid. The void rate, that is to say the percentage of void space relative to the space occupied by the material, is for example comprised in a range going from 30% to 50%. The vacuum rate may be equal to 40%.
The rectifier 10 may be made of steel or any other rigid material and compatible with the fluid.
As can be understood from the view in FIG. 1A, the flow rectifier makes it possible to obtain an axisymmetric speed profile such that the volume flow rate of fluid in the vicinity of the central axis A is greater than the peripheral volume flow rate and this from any speed profile.
The shape of the main part concentrates the speed profile in the central zone in the vicinity of the axis A maintaining the rate of turbulence in the vicinity of the central axis of the order of 4%. The fluid crosses the main part and acquires, as it passes, velocity components perpendicular to the wall crossed, which achieves the desired effect at a distance downstream of the rectifier which depends on the geometric parameters of the main part such as the curvature of the surface and the inclination of a generator with respect to the axis A.

Selon une variante de réalisation représentée en coupe sur la figure 2A et en perspective sur la figure 2B, la partie principale 16 est tronquée. L'extrémité présente donc une ouverture 15 dont le diamètre d est égal au maximum à 30% du diamètre D de la conduite 13.
Selon une variante de réalisation représentée en coupe sur la figure 3A et en perspective sur la figure 3B, la partie principale 16 est tronquée et fermée par une plaque circulaire 18 dont le diamètre d est égal au maximum à 30% du diamètre D de la conduite 13. Le choix du diamètre d est effectué en fonction du profil de vitesse désiré: plus le diamètre d sera grand et plus le profil sera applati.According to an alternative embodiment shown in section in FIG. 2A and in perspective in FIG. 2B, the main part 16 is truncated. The end therefore has an opening 15 whose diameter d is at most 30% of the diameter D of the pipe 13.
According to an alternative embodiment shown in section in FIG. 3A and in perspective in FIG. 3B, the main part 16 is truncated and closed by a circular plate 18 whose diameter d is at most equal to 30% of the diameter D of the pipe. 13. The choice of the diameter d is made according to the desired speed profile: the larger the diameter d, the more the profile will be flattened.

Selon une autre variante de réalisation représentée en coupe sur la figure 4A et en perspective sur la figure 4B, la base de la partie principale 16 est entourée d'une couronne 20 percée de trous. La couronne 20 peut avoir une largeur I comprise dans une gamme allant de 0 D à 1/3 D. Elle permet d'augmenter l'efficacité du redresseur au voisinage des parois: La perte de charge est acérue et par conséquent la vitesse du fluide est diminuée.According to another alternative embodiment shown in section in FIG. 4A and in perspective in FIG. 4B, the base of the main part 16 is surrounded by a crown 20 pierced with holes. The crown 20 can have a width I included in a range from 0 D to 1/3 D. It allows to increase the efficiency of the rectifier in the vicinity of walls: The pressure drop is sharp and therefore the fluid speed is decreased.

Les figures 5A et 5B représentent respectivement en coupe et en perspective un mode de réalisation avantageux parce que simple à réaliser.
Dans cet exemple de réalisation, la partie principale 16 du redresseur possède la forme d'un cône.
L'angle a que fait une génératrice du cône avec l'axe central A est compris dans une gamme allant de 10° à 40° et peut par exemple être égal à 20°. Dans ce cas, l'extension longitudinale du cône est égale à ∼1,4 D, la base circulaire du cône ayant un diamètre égal à D.
On comprend que plus l'angle a sera petit, plus le profil de vitesse sera effilé.
Le taux de vide de la plaque trouée formant le cône peut être de 40%.
Bien entendu, la forme en cône de la figure 5A peut être associée aux variantes des figures 2A, 3A et 4A en d'autres termes, le cône peut être tronqué, et éventuellement fermé en son extrémité par une plaque plane trouée ou encore la base circulaire du cône peut avoir un diamètre inférieur à D, le cône étant solidaire d'une couronne périphérique trouée. Un redresseur de flux conforme à l'invention dans l'une ou l'autre de ses variantes de réalisation trouve une application avantageuse dans un poste de détente et de comptage et notamment lorsque les moyens de comptage sont constitués par un compteur à turbine.FIGS. 5A and 5B respectively show in section and in perspective an advantageous embodiment because it is simple to carry out.
In this embodiment, the main part 16 of the rectifier has the shape of a cone.
The angle a that a cone generator makes with the central axis A is in a range from 10 ° to 40 ° and can for example be equal to 20 °. In this case, the longitudinal extension of the cone is equal to ∼1.4 D, the circular base of the cone having a diameter equal to D.
It is understood that the smaller the angle a, the more the speed profile will be tapered.
The void rate of the holey plate forming the cone can be 40%.
Of course, the cone shape of FIG. 5A can be associated with the variants of FIGS. 2A, 3A and 4A in other words, the cone can be truncated, and possibly closed at its end by a flat plate with holes or the base circular of the cone may have a diameter less than D, the cone being integral with a perforated peripheral crown. A flow rectifier according to the invention in one or other of its variant embodiments finds an advantageous application in an expansion and counting station and in particular when the counting means are constituted by a turbine meter.

La figure 6 représente schématiquement un poste de détente et de comptage. Un tel poste est constitué par un ensemble d'éléments raccordés entre eux par des canalisations dans des configurations qui dépendent de l'utilisation envisagée. Sur la figure 6, le poste est constitué par la succession d'éléments suivante donnée dans le sens de circulation du fluide: un joint isolant électrique 30, une première vanne 32, un filtre 34, le détendeur 36, le redressseur de flux 10, le compteur 38, et une seconde vanne 40.
Dans l'exemple illustré sur la figure 6, le redresseur de flux 10 est un cône Dans cette configuration particulière, le redresseur est disposé selon une direction perpendicualire à la direction d'arrivée du flux.
Le redresseur est placé à proximité immédiate du compteur 38, c'est à dire à une distance inférieure à 0,5 D.
Une telle configuration permet de diminuer l'encombrement du poste puisque le redressement a lieu directement en aval du redresseur 10 et non après que le fluide ait parcouru une distance de quelques D. D'autre part, la combinaison d'un redresseur tel que décrit ci-dessus et d'un compteur, par exemple à turbine, permet d'obtenir une précision de 0 à 0,5% sur le comptage.FIG. 6 schematically represents an expansion and counting station. Such a station is made up of a set of elements connected together by pipes in configurations which depend on the intended use. In FIG. 6, the station is constituted by the following succession of elements given in the direction of circulation of the fluid: an electrical insulating joint 30, a first valve 32, a filter 34, the regulator 36, the flow rectifier 10, the counter 38, and a second valve 40.
In the example illustrated in FIG. 6, the flow rectifier 10 is a cone. In this particular configuration, the rectifier is arranged in a direction perpendicular to the direction of arrival of the flow.
The rectifier is placed in the immediate vicinity of the counter 38, that is to say at a distance of less than 0.5 D.
Such a configuration makes it possible to reduce the size of the station since the rectification takes place directly downstream of the rectifier 10 and not after the fluid has traveled a distance of a few D. On the other hand, the combination of a rectifier as described above and a counter, for example with a turbine, makes it possible to obtain an accuracy of 0 to 0.5% on the counting.

Claims (10)

  1. A flow rectifier, pierced with holes (17) and featuring a main section (16) intended to be placed upstream, this section (16) having a surface of rotational symmetry around a central axis (A), characterized in that said surface is generated by a curve forming, in a plane containing said central axis, an angle (a) with this central axis, and when moving from upstream toward downstream said angle (a) increasing or remaining constant, the curve thus becoming a straight line.
  2. A flow rectifier according to claim 1, characterized in that the main section (16) is truncated.
  3. A flow rectifier according to claim 2, characterized in that the main section (16) has one end closed off by a circular plate (18) which is pierced with holes (17).
  4. A flow rectifier according to claim 1, characterized in that the main section (16) is surrounded by a ring (20) which is pierced with holes (17).
  5. A flow rectifier according to claim 1, characterized in that the main section (16) has a longitudinal extension (L) ranging from 0.6 D to 2.8 D, where D is the largest diameter of the rectifier.
  6. A flow rectifier according to claim 1, characterized in that said main section (16) is conical.
  7. A flow rectifier according to claim 6, characterized in that the cone has a circular base of diameter adapted to the diameter of the pipe on which the rectifier is to be installed.
  8. A flow rectifier according to claim 6, characterized in that the cone has a generatrix forming an angle between 10° and 40° with the central axis (A).
  9. A flow rectifier according to claim 1, characterized in that it has a void fraction ranging from 30% to 50%.
  10. A pressure-reducing and metering station characterized in that it features a flow rectifier in accordance with any one of claims 1 to 9, installed upstream and in the immediate proximity of metering means (38).
EP19930401809 1992-07-29 1993-07-13 Flow rectifier for an expansion station and a metering device Expired - Lifetime EP0581636B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9209509 1992-07-29
FR9209509A FR2694345B1 (en) 1992-07-29 1992-07-29 Flow rectifier and expansion and metering station comprising such a flow rectifier.

Publications (2)

Publication Number Publication Date
EP0581636A1 EP0581636A1 (en) 1994-02-02
EP0581636B1 true EP0581636B1 (en) 2000-05-10

Family

ID=9432500

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930401809 Expired - Lifetime EP0581636B1 (en) 1992-07-29 1993-07-13 Flow rectifier for an expansion station and a metering device

Country Status (3)

Country Link
EP (1) EP0581636B1 (en)
DE (1) DE69328592D1 (en)
FR (1) FR2694345B1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH289617A (en) * 1951-04-25 1953-03-31 Neuschwander Paul Aerator with filter.
GB1490188A (en) * 1974-02-07 1977-10-26 Secr Defence Jet catchers

Also Published As

Publication number Publication date
FR2694345A1 (en) 1994-02-04
DE69328592D1 (en) 2000-06-15
FR2694345B1 (en) 1994-10-07
EP0581636A1 (en) 1994-02-02

Similar Documents

Publication Publication Date Title
EP1261829B1 (en) Plate exchanger
EP2475463B1 (en) Device for dispensing liquid
EP1019627B1 (en) Jet pump comprising a jet with variable cross-section
FR2834016A1 (en) Jet pump for transferring fuel between different compartments in multi-compartment fuel tanks, has sealing elements each adapted to open when pressure of injected fluid exceeds predetermined level
EP1132625B1 (en) Liquid-vapour jet pump with movable nozzle
WO2018059770A1 (en) Device for cleaning the external surface of a motor vehicle sensor
EP3011185B1 (en) Centrifugal rotor
FR3013098A1 (en) DEVICE FOR LIMITING THE PRESSURE
FR2938642A1 (en) TURBINE FOR MEASURING PETROLEUM PRODUCTS CHARGED WITH A FRICTION REDUCING AGENT
EP0581636B1 (en) Flow rectifier for an expansion station and a metering device
EP0082775A2 (en) Cowl for gaseous fluid
FR2655956A1 (en) TANK WITH HAIR CAPILLARY EFFECT.
EP0478421B1 (en) Sealing device with a liquid seal
EP1820969A1 (en) Hydraulic pump, in particular of an electric pump unit for the power steering of an automobile
WO2005038243A1 (en) Tip-forming element for hydraulic machine wheel, method of assembling one such wheel, and wheel and hydraulic machine equipped with one such element
WO2001073366A1 (en) Plate heat exchanger
FR2535406A1 (en) Turbine for harnessing of the energy of fluids in motion, especially of wind energy
EP1378731A1 (en) Water meter body with curved external tubes
EP1825132A1 (en) Element for the exhaust circuit of an internal combustion engine
EP0559564A1 (en) Progressive expansion valve
FR2705574A1 (en) Implantable drainage valve for the treatment of hydrocephalus
EP1338320A1 (en) Filter with a volume reduction body
WO1990007079A1 (en) Rectifier for adjusting the flow of a liquid in a pipe
FR2644868A1 (en) Automatically stable valve
CH368984A (en) Lubricating aerosol generator

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE ES FR GB GR IT NL PT

17P Request for examination filed

Effective date: 19940725

17Q First examination report despatched

Effective date: 19970715

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE ES FR GB GR IT NL PT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20000510

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 20000510

Ref country code: GR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000510

Ref country code: GB

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20000510

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 20000510

REF Corresponds to:

Ref document number: 69328592

Country of ref document: DE

Date of ref document: 20000615

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20000810

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20000811

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 20000510

BERE Be: lapsed

Owner name: S.A. SCHLUMBERGER INDUSTRIES

Effective date: 20000731

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010330

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

26N No opposition filed