EP0895020A1 - Device for introducing air into a hydropneumatic reservoir - Google Patents

Device for introducing air into a hydropneumatic reservoir Download PDF

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Publication number
EP0895020A1
EP0895020A1 EP19980401961 EP98401961A EP0895020A1 EP 0895020 A1 EP0895020 A1 EP 0895020A1 EP 19980401961 EP19980401961 EP 19980401961 EP 98401961 A EP98401961 A EP 98401961A EP 0895020 A1 EP0895020 A1 EP 0895020A1
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EP
European Patent Office
Prior art keywords
air
pump
pressure
hydropneumatic
tube
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EP19980401961
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German (de)
French (fr)
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EP0895020B1 (en
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Emile Roche
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/20—Arrangements or systems of devices for influencing or altering dynamic characteristics of the systems, e.g. for damping pulsations caused by opening or closing of valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2931—Diverse fluid containing pressure systems
    • Y10T137/3115—Gas pressure storage over or displacement of liquid
    • Y10T137/3118—Surge suppression
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2931—Diverse fluid containing pressure systems
    • Y10T137/3115—Gas pressure storage over or displacement of liquid
    • Y10T137/3127—With gas maintenance or application
    • Y10T137/313—Gas carried by or evolved from liquid
    • Y10T137/3133—Gas injectors

Definitions

  • the present invention relates to an air introduction device in a hydropneumatic tank fitted to a pipeline hydraulic which can be, in particular, a water distribution network drinking water or irrigation, or a sewage or drainage system chemical liquids.
  • a hyropneumatic tank can operate as a regulation (or hydrophore) to regulate the pumping pressure and ensure continuity of service in the pipeline, within a range of pressure between a high level and a low level. Beyond the high pressure level, the supply pump (or one of the pumps) of the pipeline is stopped. The regulation tank then makes a water supply in the pipeline. When the low level is reached, the pump is restarted to ensure sufficient pressure and flow in the pipeline.
  • a regulation or hydrophore
  • a hydropneumatic tank can also be used as anti-ram tank in a hydraulic line to compensate the effects of depression and overpressure caused, for example, by stopping a pump or closing a valve.
  • the functioning of such a reservoir is known in particular from French Patent No. 2,416 417 (ROCHE).
  • hydro-pneumatic tank requires maintaining the most constant amount of air possible at inside of it.
  • the hydropneumatic tank contains effect, in operation, of water or any liquid in flow in the pipeline, and air trapped in the tank just above the surface of water or liquid. A dissolution of air in the liquid can occur and thus create a variation in the amount of air trapped in the tank. So it is necessary introduce air into the tank in case of insufficiency.
  • bladders are sometimes used which have cost disadvantages, even fragility, especially for large installations and high pressures, pressure drop when emptying due to the installation of a grid intended for prevent bladder extrusion, and need to control the air inflation of the device.
  • air compressors we can also cite the use of air compressors. However, these are not recommended for drinking water systems due to the risk of oil in the air injected, and are relatively expensive.
  • the object of the invention is to remedy the drawbacks of aforementioned systems by proposing an air introduction device simple, inexpensive, low energy consumption and not modifying not the hydraulic operation of the installation.
  • the air introduction device is intended for a hydraulic system including a hydropneumatic tank mounted on a pipeline.
  • the air introduction device is mounted so as to introduce air into a water area of the system where the pressure is close to atmospheric pressure, i.e. lower or slightly higher.
  • the device is active only when there is a lack of air in the hydro-pneumatic tank. Thus, the energy required by the introduction of air is low, or almost zero in some cases.
  • the device generally comprises an air supply tube fitted means for controlling the introduction of air.
  • the device of air introduction is mounted on the pipe between a water intake and a pump.
  • the pipe is provided with a pressure reducing device upstream of the hydro-pneumatic tank, the air supply tube being connected to said means depression.
  • the device air inlet includes a bypass tube connected to a part in water from the hydropneumatic tank, an auxiliary pump fitted on the bypass tube, and a pressure reducing device mounted downstream of the auxiliary pump, the air supply tube being connected to said means depression.
  • the pressure-reducing means comprises a tube of venturi.
  • Venturi tube provides liquid pressure locally below atmospheric pressure.
  • Other ways depressants are possible: diaphragm, etc.
  • the device air inlet includes an electric valve and a shut-off valve adjustment or an air introduction flow limiter arranged on the tube air intake.
  • the device of air introduction is mounted upstream of a pump, the supply tube of air opening into the low pressure area of the pump.
  • the area low pressure designates the location of the pump where, when operation, air can be injected and where the pressure of the threads liquids is minimal or close to the minimum.
  • the air supply tube may open into the strainer pump inlet.
  • the air introduction device comprises a small air booster mounted on the air supply tube, when the pressure P S is higher than atmospheric pressure.
  • P S is the absolute pressure in the air introduction zone, pump strainer, low pump pressure zone, suction pipe upstream of the pump, etc.
  • the pressure P S is lower than atmospheric pressure and the booster is unnecessary.
  • the invention also relates to a pump equipped with a air introduction device and a hydropneumatic tank fitted an air introduction device.
  • air can be introduced into a tank hydropneumatic with low or very low consumption of energy and using a device of great simplicity and low cost.
  • the hydraulic system includes a pipe 1 provided with a pump 2 and a reservoir hydropneumatic 3 located downstream of the pump 2 on the pipeline 1 and serving as a control tank or an anti-ram tank.
  • the upstream end 1a of the pipe 1 is equipped with a strainer 4 and a foot valve, not shown, for withdrawing water or a any liquid in a tarpaulin 5.
  • the reservoir hydropneumatic 3 allows to adapt the liquid flow in the Line 1 to the needs of the users. So when the liquid in the hydropneumatic tank 3 reaches a higher level 6a, pump 2 is stopped and the hydropneumatic tank 3 is emptied gradually by supplying liquid in line 1. When the liquid in the hydropneumatic tank 3 reaches the lower level 6b, the pump 2 is restarted to ensure, on the one hand, the flow in line 1 and, on the other hand, the filling of the hydropneumatic tank 3.
  • Another use of the tank hydropneumatic is the use as an anti-ram tank as already indicated.
  • the proper functioning of the hydro-pneumatic tank 3 requires a relatively constant amount of air is present inside. However, the air present in the hydro-pneumatic tank 3 tends to dissolve in the liquid.
  • an air introduction device 7 comprising a tube 8 one end of which opens into the open air and the other end of which opens into line 1, an electric valve 9 and a member air flow limiter 10, for example an adjustment valve air introduction, both arranged on the air supply tube 8.
  • the electric valve 9 is connected to a lack of air detector 11 placed on the hydropneumatic tank 3.
  • the lack detector air can be, for example, a level sensor but others systems are possible.
  • the electric valve 9 Only when a lack of air is to be filled in the hydropneumatic tank 3 and that the pump 2 is in operation, the electric valve 9 is open, which causes the introduction of air through the tube 8 into the pipe 1 in upstream of the pump 2.
  • the pressure P S prevailing in the pipe portion 1 limited by the pump 2 and the strainer 4 is lower than atmospheric pressure due to the suction of the pump 2 and the fact that this is arranged above the level of the water body. The air thus introduced then passes through pump 2 and then into the hydropneumatic tank 3.
  • an air trap 12 can be provided located at the base of the hydropneumatic reservoir 3.
  • the air trap 12 may consist of a portion of sloping pipe directed towards the down in the downstream direction.
  • the sheet 5 is placed at an altitude higher than that of the pump 2.
  • the air introduction device 7 is then placed in the immediate vicinity of the pump 2, the air supply tube 8 opening into the low pressure zone of pump 2 to take advantage of the fact that the pressure P S y is less than atmospheric pressure.
  • the pump 2 is of the submerged type.
  • the air introduction device 7 is again provided with the tube 8 opening into the low pressure zone of the pump 2 to take advantage of the fact that the pressure P S y is lower than atmospheric pressure.
  • the air introduction device operates from the same way for one pump or for a plurality of pumps arranged in parallel. Only one device can be provided for several pumps, the tube 8 then having ramifications towards each pump after the electric valve 9 and the regulating valve 10 ( Figures 1, 2, 3), or each equipped with an electric valve for prevent overpressurized air from reaching the strainers of the pump the stop ( Figures 4 and 5 and possibly 6).
  • the pump 2 is submerged.
  • the air supply tube 8 of the air introduction device 7 opens into the strainer 4 of the pump 2.
  • the pressure P S prevailing in the strainer 4 is slightly higher than atmospheric pressure.
  • the air introduction device 7 is therefore provided with an air booster 13 disposed upstream of the regulating valve 10 and capable of providing a slight overpressure relative to the pressure P S prevailing in the strainer 4 minus the pressure atmospheric and more pressure losses in the device. For example, an overpressure of the order of a few tenths of bars may be necessary.
  • FIG. 5 shows a variant close to FIG. 4, in which pump 2 is replaced by an electric pump group submerged provided with a pump 14 and a drive motor 15.
  • the electric valve is not necessary, because the introduction of air is controlled by the operation and stopping of the booster 13.
  • booster 13 operates only when it is necessary to compensate for a deficit of air in the hydro-pneumatic tank and when the pump is running.
  • Figure 6 shows a hydraulic system identical to that of Figure 2, but in which the air introduction device is similar to that of Figure 4 because P S is higher than atmospheric pressure.
  • the air introduction device is provided with a booster 13 and its tube 8 opens immediately at the inlet of the pump 2 or, better still, in the low pressure area of the pump 2, which reduces the value of P S.
  • the booster 13 can be equipped with a buffer bottle, not shown, in the event that its flow rate is too great.
  • the valve 16 or an electric valve 9 is here essential to prevent a return of liquid to the booster 6, when the pump 2 is stopped as well as the booster.
  • the air introduction device 7 is provided with a submerged booster 13, the regulating valve 10 being placed in the air free, upstream of the booster 13 on the air supply tube 8.
  • the tube air intake 8 connects to a strainer or to the weak zone pressure of a submerged pump, not shown.
  • the hydropneumatic reservoir 3 is arranged in lying position and is connected to a portion of upstream pipe 1b and to a portion of downstream pipe 1c. Like the two portions of pipe 1b and 1c open directly into the hydro-pneumatic tank 3 without being interconnected, it is guaranteed that air arriving via the upstream pipe portion 1b remains in the tank hydropneumatic 3 and is not sent to the pipeline portion downstream 1c.
  • An equivalent system can equip a hydro-pneumatic tank in vertical position, the pipe portions 1b and 1c arriving then in the convex bottom of this tank.
  • a pressure-reducing system is directly installed on the pipeline. 1 or bypass so as to create an area where the operating pressure P S is lower than atmospheric pressure.
  • a venturi tube 17 which has the shape of a constriction, is arranged on the pipe 1.
  • the venturi tube 17 comprises a convergent 17a, a cylindrical portion 17b and a divergent 17c.
  • the operating pressure P S in the cylindrical portion 17b is much lower than the pressure prevailing in the rest of the pipe 1.
  • the venturi tube 17 is dimensioned so that the pressure P S is less than atmospheric pressure.
  • the air introduction device 7 comprises a supply tube air 8 in communication with the cylindrical portion 17b, a valve electric 9 and an adjustment valve 10. We thus manage to introduce air in a pipeline. under high pressure when the valve electric 9 is open.
  • FIG. 10 Alternatively and advantageously, provision can be made ( Figures 10 and 11) a bypass tube 18, the two ends of which are connected to the hydropneumatic tank 3 in a portion still in water from this one.
  • the bypass tube 18 is provided with an auxiliary pump 19 low power but able to withstand high pressures prevailing in the hydropneumatic reservoir, of a venturi tube 17 arranged downstream of the auxiliary pump 19 and of a device for introducing air 7 connected to the venturi tube 17.
  • the pump 19 When a lack of air is to be filled in the hydropneumatic tank, the pump 19 is started, which causes the circulation of liquid in the bypass tube 18.
  • the venturi tube 17 creates an area where the operating pressure P S is less than atmospheric pressure.
  • the air introduction device 7 provided with an air supply tube 8, a valve 16 and an adjustment valve 10, allows air to enter as long as the pump 19 is operating. When the latter is stopped, the valve 16 closes under the pressure of the liquid and the introduction of air is stopped.
  • auxiliary pump 19, "in line” is only intended to create in the tube 18 sufficient circulation. Its head can therefore be unimportant and represent only a small fraction of that of the pumping station pumps or the prevailing pressure in the hydropneumatic tank.
  • the valve 16 can be replaced by an open electric valve 9 only when the auxiliary pump 19 is operating.
  • the system can operate regardless of the state of the pump (s) of the pumping station: stop or start.
  • the hydropneumatic reservoir 3 generally of the water balloon type, comprises an asymmetrical member 20, for example a pierced valve creating a pressure drop when filling the hydropneumatic reservoir 3.
  • a bypass tube 21 is disposed between the pipe 1 and the hydropneumatic reservoir 3.
  • the pressure drop created during filling of the hydropneumatic reservoir 3 by the asymmetrical member 20 causes a sufficient flow to pass through the tube 21 provided with a venturi tube 17 and a device for introduction of air 7 so that the operating pressure P S in the cylindrical portion of the venturi tube 17 becomes lower than atmospheric pressure and allows the introduction of air.
  • the air introduction device 7 includes both an electric valve 9 open when an air deficit is to be filled and a non-return valve 16 to prevent liquid leaking through the tube 8, excluding filling of the hydropneumatic tank 3, but the electric valve 9 being open.
  • an air introduction device in a hydropneumatic tank suitable for systems hydraulic systems of various types, water hammer tanks, regulation, low cost and low energy consumption.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Harvester Elements (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)
  • Catching Or Destruction (AREA)
  • Nozzles (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

The air inlet device (7), for a system comprising a hydropneumatic reservoir (3) mounted on a pipe, is positioned so that the air is let into a zone containing water at an absolute pressure which is below or slightly above atmospheric pressure, and is actuated only when the hydropneumatic reservoir needs re-filling with air. The inlet device comprises an air feed tube (8), mounted on the pipe between the water intake and a pump (2) equipped with an electrically-driven air control valve and a flow limiter. The pipe is equipped with a vacuum generator upstream of the hydropneumatic reservoir, e.g. in the form of a Venturi tube.

Description

La présente invention concerne un dispositif d'introduction d'air dans un réservoir hydropneumatique équipant une canalisation hydraulique qui peut être, notamment, un réseau de distribution d'eau potable ou d'irrigation, ou un réseau d'évacuation d'eaux usées ou de liquides chimiques.The present invention relates to an air introduction device in a hydropneumatic tank fitted to a pipeline hydraulic which can be, in particular, a water distribution network drinking water or irrigation, or a sewage or drainage system chemical liquids.

Un réservoir hyropneumatique peut fonctionner en réservoir de régulation (ou hydrophore) pour réguler la pression de pompage et assurer la continuité du service dans la canalisation, dans une plage de pression entre un niveau haut et un niveau bas. Au dépassement du niveau haut de pression, la pompe (ou une des pompes) d'alimentation de la canalisation est arrêtée. Le réservoir de régulation fait alors un apport d'eau dans la canalisation. Lorsque le niveau bas est atteint, la pompe est redémarrée pour assurer une pression et un débit suffisants dans la canalisation.A hyropneumatic tank can operate as a regulation (or hydrophore) to regulate the pumping pressure and ensure continuity of service in the pipeline, within a range of pressure between a high level and a low level. Beyond the high pressure level, the supply pump (or one of the pumps) of the pipeline is stopped. The regulation tank then makes a water supply in the pipeline. When the low level is reached, the pump is restarted to ensure sufficient pressure and flow in the pipeline.

Un réservoir hydropneumatique peut également être utilisé comme réservoir anti-bélier d'une canalisation hydraulique afin de compenser les effets de dépression et de surpression provoqués, par exemple, par l'arrêt d'une pompe ou la fermeture d'une vanne. Le fonctionnement d'un tel réservoir est connu notamment par le brevet français n° 2 416 417 (ROCHE).A hydropneumatic tank can also be used as anti-ram tank in a hydraulic line to compensate the effects of depression and overpressure caused, for example, by stopping a pump or closing a valve. The functioning of such a reservoir is known in particular from French Patent No. 2,416 417 (ROCHE).

Le bon fonctionnement d'un réservoir hydro-pneumatique nécessite le maintien d'une quantité d'air la plus constante possible à l'intérieur de celui-ci. Le réservoir hydropneumatique contient en effet, en fonctionnement, de l'eau ou un liquide quelconque en écoulement dans la canalisation, et de l'air enfermé dans le réservoir juste au-dessus de la surface d'eau ou de liquide. Une dissolution de l'air dans le liquide peut se produire et créer ainsi une variation de la quantité d'air enfermée dans le réservoir. Il est donc nécessaire d'introduire de l'air dans le réservoir en cas d'insuffisance.The proper functioning of a hydro-pneumatic tank requires maintaining the most constant amount of air possible at inside of it. The hydropneumatic tank contains effect, in operation, of water or any liquid in flow in the pipeline, and air trapped in the tank just above the surface of water or liquid. A dissolution of air in the liquid can occur and thus create a variation in the amount of air trapped in the tank. So it is necessary introduce air into the tank in case of insufficiency.

Pour éviter le contact entre l'air et le liquide et éviter ainsi une dissolution d'air, on utilise parfois des vessies qui présentent des inconvénients de coût, voire de fragilité, notamment pour les installations de grande taille et les fortes pressions, de perte de charge à la vidange en raison de la mise en place d'une grille destinée à prévenir l'extrusion de la vessie, et de nécessité du contrôle du gonflage d'air de l'appareil. On peut également citer l'utilisation de compresseurs d'air. Toutefois, ceux-ci ne sont pas préconisés pour les réseaux d'eau potable en raison du risque de présence d'huile dans l'air injecté, et sont relativement onéreux.To avoid contact between air and liquid and thus avoid air dissolution, bladders are sometimes used which have cost disadvantages, even fragility, especially for large installations and high pressures, pressure drop when emptying due to the installation of a grid intended for prevent bladder extrusion, and need to control the air inflation of the device. We can also cite the use of air compressors. However, these are not recommended for drinking water systems due to the risk of oil in the air injected, and are relatively expensive.

L'invention a pour objet de remédier aux inconvénients des systèmes précités en proposant un dispositif d'introduction d'air simple, peu coûteux, à faible consommation d'énergie et ne modifiant pas le fonctionnement hydraulique de l'installation.The object of the invention is to remedy the drawbacks of aforementioned systems by proposing an air introduction device simple, inexpensive, low energy consumption and not modifying not the hydraulic operation of the installation.

Le dispositif d'introduction d'air, selon l'invention, est destiné à un système hydraulique comprenant un réservoir hydropneumatique monté sur une canalisation. Le dispositif d'introduction d'air est monté de façon à introduire de l'air dans une zone en eau du système où la pression est voisine de la pression atmosphérique, c'est-à-dire inférieure ou légèrement supérieure. Le dispositif est actif uniquement lorsqu'un manque d'air est constaté dans le réservoir hydro-pneumatique. Ainsi, l'énergie nécessitée par l'introduction d'air est faible, voire presque nulle dans certains cas.The air introduction device according to the invention is intended for a hydraulic system including a hydropneumatic tank mounted on a pipeline. The air introduction device is mounted so as to introduce air into a water area of the system where the pressure is close to atmospheric pressure, i.e. lower or slightly higher. The device is active only when there is a lack of air in the hydro-pneumatic tank. Thus, the energy required by the introduction of air is low, or almost zero in some cases.

Le dispositif comprend, en général, un tube d'amenée d'air équipé de moyens de contrôle de l'introduction d'air.The device generally comprises an air supply tube fitted means for controlling the introduction of air.

Dans un mode de réalisation de l'invention, le dispositif d'introduction d'air est monté sur la canalisation entre une prise d'eau et une pompe.In one embodiment of the invention, the device of air introduction is mounted on the pipe between a water intake and a pump.

Dans un autre mode de réalisation de l'invention, la canalisation est pourvue d'un moyen déprimogène en amont du réservoir hydro-pneumatique, le tube d'amenée d'air étant relié audit moyen déprimogène.In another embodiment of the invention, the pipe is provided with a pressure reducing device upstream of the hydro-pneumatic tank, the air supply tube being connected to said means depression.

Dans un autre mode de réalisation de l'invention, le dispositif d'introduction d'air comprend un tube de dérivation relié à une partie en eau du réservoir hydropneumatique, une pompe auxiliaire montée sur le tube de dérivation, et un moyen déprimogène monté en aval de la pompe auxiliaire, le tube d'amenée d'air étant relié audit moyen déprimogène. In another embodiment of the invention, the device air inlet includes a bypass tube connected to a part in water from the hydropneumatic tank, an auxiliary pump fitted on the bypass tube, and a pressure reducing device mounted downstream of the auxiliary pump, the air supply tube being connected to said means depression.

Avantageusement, le moyen déprimogène comprend un tube de venturi. Le tube de venturi permet d'obtenir une pression de liquide localement inférieure à la pression atmosphérique. D'autres moyens déprimogènes sont envisageables : diaphragme, etc.Advantageously, the pressure-reducing means comprises a tube of venturi. Venturi tube provides liquid pressure locally below atmospheric pressure. Other ways depressants are possible: diaphragm, etc.

Dans un mode de réalisation de l'invention, le dispositif d'introduction d'air comprend une vanne électrique et un robinet de réglage ou un limiteur de débit d'introduction d'air disposés sur le tube d'amenée d'air.In one embodiment of the invention, the device air inlet includes an electric valve and a shut-off valve adjustment or an air introduction flow limiter arranged on the tube air intake.

Dans un mode de réalisation de l'invention, le dispositif d'introduction d'air est monté en amont d'une pompe, le tube d'amenée d'air débouchant dans la zone de faible pression de la pompe. La zone de faible pression désigne l'endroit de la pompe où, lors de son fonctionnement, de l'air peut être injecté et où la pression des filets liquides est minimale ou proche du minimum.In one embodiment of the invention, the device of air introduction is mounted upstream of a pump, the supply tube of air opening into the low pressure area of the pump. The area low pressure designates the location of the pump where, when operation, air can be injected and where the pressure of the threads liquids is minimal or close to the minimum.

En variante, le tube d'amenée d'air peut déboucher dans la crépine d'entrée de la pompe.Alternatively, the air supply tube may open into the strainer pump inlet.

Le dispositif d'introduction d'air comprend un petit surpresseur d'air monté sur le tube d'amenée d'air, lorsque la pression PS est supérieure à la pression atmosphérique. PS est la pression absolue dans la zone d'introduction d'air , crépine de pompe, zone de faible pression de la pompe, canalisation d'aspiration à l'amont de la pompe, etc.The air introduction device comprises a small air booster mounted on the air supply tube, when the pressure P S is higher than atmospheric pressure. P S is the absolute pressure in the air introduction zone, pump strainer, low pump pressure zone, suction pipe upstream of the pump, etc.

Dans un mode de réalisation préféré de l'invention, la pression PS est inférieure à la pression atmosphérique et le surpresseur est inutile.In a preferred embodiment of the invention, the pressure P S is lower than atmospheric pressure and the booster is unnecessary.

L'invention a également pour objet une pompe équipée d'un dispositif d'introduction d'air et un réservoir hydropneumatique équipé d'un dispositif d'introduction d'air.The invention also relates to a pump equipped with a air introduction device and a hydropneumatic tank fitted an air introduction device.

Grâce à l'invention, on peut introduire de l'air dans un réservoir hydropneumatique avec une faible ou très faible consommation d'énergie et en utilisant un dispositif d'une grande simplicité et de faible coût.Thanks to the invention, air can be introduced into a tank hydropneumatic with low or very low consumption of energy and using a device of great simplicity and low cost.

L'invention sera mieux comprise et d'autres avantages apparaítront à la description détaillée de quelques modes de réalisation pris à titre d'exemples nullement limitatifs et illustrés par les dessins annexés, sur lesquels :

  • la figure 1 montre schématiquement un système hydraulique pourvu d'un dispositif d'introduction d'air selon l'invention;
  • la figure 2 montre schématiquement un autre système hydraulique avec un dispositif d'introduction d'air disposé à l'entrée d'une pompe;
  • la figure 3 montre schématiquement un système hydraulique pourvu d'une pompe immergée, le dispositif d'introduction d'air étant monté sur la pompe;
  • la figure 4 est une variante de la figure 3;
  • la figure 5 est une autre variante de la figure 3;
  • la figure 6 montre une variante de la figure 2;
  • la figure 7 montre schématiquement un dispositif d'introduction d'air à surpresseur immergé;
  • la figure 8 est une vue de côté en élévation d'un réservoir hydro-pneumatique;
  • la figure 9 montre schématiquement une canalisation équipée d'un dispositif d'introduction d'air conforme à l'invention;
  • les figures 10 et 11 montrent schématiquement un réservoir hydropneumatique équipé d'un dispositif d'introduction d'air conforme à l'invention; et
  • la figure 12 montre schématiquement une variante dans laquelle le dispositif d'introduction d'air est disposé entre la canalisation et le réservoir hydropneumatique.
    • The invention will be better understood and other advantages will appear from the detailed description of a few embodiments taken by way of non-limiting examples and illustrated by the appended drawings, in which:
  • Figure 1 schematically shows a hydraulic system provided with an air introduction device according to the invention;
  • Figure 2 schematically shows another hydraulic system with an air introduction device disposed at the inlet of a pump;
  • FIG. 3 schematically shows a hydraulic system provided with a submerged pump, the air introduction device being mounted on the pump;
  • Figure 4 is a variant of Figure 3;
  • Figure 5 is another variant of Figure 3;
  • Figure 6 shows a variant of Figure 2;
  • FIG. 7 schematically shows an air introduction device with a submerged booster;
  • Figure 8 is a side elevation view of a hydro-pneumatic tank;
  • FIG. 9 schematically shows a pipe fitted with an air introduction device according to the invention;
  • Figures 10 and 11 schematically show a hydropneumatic tank equipped with an air introduction device according to the invention; and
  • Figure 12 schematically shows a variant in which the air introduction device is disposed between the pipe and the hydropneumatic tank.

    • Comme on peut le voir sur la figure 1, le système hydraulique comprend une canalisation 1 pourvue d'une pompe 2 et d'un réservoir hydropneumatique 3 disposé en aval de la pompe 2 sur la canalisation 1 et servant de réservoir de régulation ou de réservoir anti-bélier. L'extrémité amont la de la canalisation 1 est équipée d'une crépine 4 et d'un clapet de pied, non représenté, pour prélever de l'eau ou un liquide quelconque dans une bâche 5.As can be seen in Figure 1, the hydraulic system includes a pipe 1 provided with a pump 2 and a reservoir hydropneumatic 3 located downstream of the pump 2 on the pipeline 1 and serving as a control tank or an anti-ram tank. The upstream end 1a of the pipe 1 is equipped with a strainer 4 and a foot valve, not shown, for withdrawing water or a any liquid in a tarpaulin 5.

    Dans le cas d'un usage en réservoir de régulation et en ne considérant qu'un des cas pouvant se présenter, le réservoir hydropneumatique 3 permet d'adapter le débit de liquide dans la canalisation 1 aux besoins des utilisateurs. Ainsi, lorsque le liquide dans le réservoir hydropneumatique 3 atteint un niveau supérieur 6a, la pompe 2 est arrêtée et le réservoir hydropneumatique 3 se vide progressivement en fournissant du liquide dans la canalisation 1. Lorsque le liquide dans le réservoir hydropneumatique 3 atteint le niveau inférieur 6b, la pompe 2 est redémarrée pour assurer, d'une part, le débit dans la canalisation 1 et, d'autre part, le remplissage du réservoir hydropneumatique 3. Un autre usage du réservoir hydropneumatique est l'emploi comme réservoir anti-bélier comme déjà indiqué.In the case of use in a control tank and not considering that one of the cases which may arise, the reservoir hydropneumatic 3 allows to adapt the liquid flow in the Line 1 to the needs of the users. So when the liquid in the hydropneumatic tank 3 reaches a higher level 6a, pump 2 is stopped and the hydropneumatic tank 3 is emptied gradually by supplying liquid in line 1. When the liquid in the hydropneumatic tank 3 reaches the lower level 6b, the pump 2 is restarted to ensure, on the one hand, the flow in line 1 and, on the other hand, the filling of the hydropneumatic tank 3. Another use of the tank hydropneumatic is the use as an anti-ram tank as already indicated.

    Le bon fonctionnement du réservoir hydro-pneumatique 3 exige qu'une quantité d'air relativement constante soit présente à l'intérieur. Or, l'air présent dans le réseroir hydro-pneumatique 3 a tendance à se dissoudre dans le liquide.The proper functioning of the hydro-pneumatic tank 3 requires a relatively constant amount of air is present inside. However, the air present in the hydro-pneumatic tank 3 tends to dissolve in the liquid.

    On prévoit donc sur la canalisation 1 entre la crépine 4 et la pompe 2, un dispositif d'introduction d'air 7 comprenant un tube 8 dont une extrémité débouche à l'air libre et dont l'autre extrémité débouche dans la canalisation 1, une vanne électrique 9 et un organe limiteur de débit d'air 10, par exemple un robinet de réglage d'introduction d'air, tous deux disposés sur le tube d'amenée d'air 8. La vanne électrique 9 est reliée à un détecteur de manque d'air 11 disposé sur le réservoir hydropneumatique 3. Le détecteur de manque d'air peut être, par exemple, un capteur de niveau mais d'autres systèmes sont possibles.It is therefore planned on the pipe 1 between the strainer 4 and the pump 2, an air introduction device 7 comprising a tube 8 one end of which opens into the open air and the other end of which opens into line 1, an electric valve 9 and a member air flow limiter 10, for example an adjustment valve air introduction, both arranged on the air supply tube 8. The electric valve 9 is connected to a lack of air detector 11 placed on the hydropneumatic tank 3. The lack detector air can be, for example, a level sensor but others systems are possible.

    Uniquement lorsqu'un manque d'air est à combler dans le réservoir hydropneumatique 3 et que la pompe 2 est en fonctionnement, la vanne électrique 9 est ouverte, ce qui provoque l'introduction d'air par le tube 8 dans la canalisation 1 en amont de la pompe 2. En effet, la pression PS régnant dans la portion de canalisation 1 limitée par la pompe 2 et la crépine 4, est inférieure à la pression atmosphérique en raison de l'aspiration de la pompe 2 et du fait que celle-ci est disposée au-dessus du niveau du plan d'eau. L'air ainsi introduit passe ensuite dans la pompe 2 puis dans le réservoir hydropneumatique 3.Only when a lack of air is to be filled in the hydropneumatic tank 3 and that the pump 2 is in operation, the electric valve 9 is open, which causes the introduction of air through the tube 8 into the pipe 1 in upstream of the pump 2. In fact, the pressure P S prevailing in the pipe portion 1 limited by the pump 2 and the strainer 4, is lower than atmospheric pressure due to the suction of the pump 2 and the fact that this is arranged above the level of the water body. The air thus introduced then passes through pump 2 and then into the hydropneumatic tank 3.

    Pour ne pas dégrader les caractéristiques de fonctionnement de la pompe 2, on limite la quantité d'air introduite à une faible fraction, par exemple quelques pour cent, du débit de liquide dans la canalisation 1. Ce réglage est effectué grâce au robinet de réglage 10. Pour garantir que tout l'air introduit dans la canalisation 1 passe dans le réservoir hydropneumatique 3, on peut prévoir un piège à air 12 disposé à la base du réservoir hydropneumatique 3. Le piège à air 12 peut consister en une portion de canalisation en pente dirigée vers le bas dans le sens aval.To avoid degrading the operating characteristics of the pump 2, the quantity of air introduced is limited to a small fraction, for example a few percent of the liquid flow in the channel 1. This adjustment is made using the adjustment valve 10. To ensure that all the air introduced into line 1 passes into the hydropneumatic tank 3, an air trap 12 can be provided located at the base of the hydropneumatic reservoir 3. The air trap 12 may consist of a portion of sloping pipe directed towards the down in the downstream direction.

    Ainsi, l'introduction d'air est effectuée au moyen d'un dispositif simple, bon marché et dont la seule consommation d'énergie est nécessitée par l'actionnement de la vanne électrique 9.Thus, the introduction of air is carried out by means of a device simple, inexpensive and whose only energy consumption is required by actuation of the electric valve 9.

    Sur la figure 2, la bâche 5 est disposée à une altitude supérieure à celle de la pompe 2. Le dispositif d'introduction d'air 7 est alors disposé à proximité immédiate de la pompe 2, le tube d'amenée d'air 8 débouchant dans la zone de faible pression de la pompe 2 pour profiter du fait que la pression PS y est inférieure à la pression atmosphérique.In FIG. 2, the sheet 5 is placed at an altitude higher than that of the pump 2. The air introduction device 7 is then placed in the immediate vicinity of the pump 2, the air supply tube 8 opening into the low pressure zone of pump 2 to take advantage of the fact that the pressure P S y is less than atmospheric pressure.

    Sur la figure 3, la pompe 2 est du type immergé. Le dispositif d'introduction d'air 7 est là encore prévu avec le tube 8 débouchant dans la zone de faible pression de la pompe 2 pour profiter du fait que la pression PS y est inférieure à la pression atmosphérique.In FIG. 3, the pump 2 is of the submerged type. The air introduction device 7 is again provided with the tube 8 opening into the low pressure zone of the pump 2 to take advantage of the fact that the pressure P S y is lower than atmospheric pressure.

    Bien entendu, le dispositif d'introduction d'air fonctionne de la même façon pour une pompe ou pour une pluralité de pompes disposées en parallèle. Un seul dispositif peut être prévu pour plusieurs pompes, le tube 8 comportant alors des ramifications vers chaque pompe après la vanne électrique 9 et le robinet de réglage 10 (figures 1, 2, 3), ou équipées chacune d'une vanne électrique pour éviter que de l'air surpressé n'aboutisse aux crépines des pompes à l'arrêt (figures 4 et 5 et éventuellement 6).Of course, the air introduction device operates from the same way for one pump or for a plurality of pumps arranged in parallel. Only one device can be provided for several pumps, the tube 8 then having ramifications towards each pump after the electric valve 9 and the regulating valve 10 (Figures 1, 2, 3), or each equipped with an electric valve for prevent overpressurized air from reaching the strainers of the pump the stop (Figures 4 and 5 and possibly 6).

    Sur la figure 4, la pompe 2 est immergée. Le tube d'amenée d'air 8 du dispositif d'introduction d'air 7 débouche dans la crépine 4 de la pompe 2. La pression PS régnant dans la crépine 4 est légèrement supérieure à la pression atmosphérique. Le dispositif d'introduction d'air 7 est donc pourvu d'un surpresseur d'air 13 disposé en amont du robinet de réglage 10 et capable de fournir une légère surpression par rapport à la pression PS régnant dans la crépine 4 moins la pression atmosphérique et plus les pertes de charge dans le dispositif. Par exemple, une surpression de l'ordre de quelques dixièmes de bars peut être nécessaire.In Figure 4, the pump 2 is submerged. The air supply tube 8 of the air introduction device 7 opens into the strainer 4 of the pump 2. The pressure P S prevailing in the strainer 4 is slightly higher than atmospheric pressure. The air introduction device 7 is therefore provided with an air booster 13 disposed upstream of the regulating valve 10 and capable of providing a slight overpressure relative to the pressure P S prevailing in the strainer 4 minus the pressure atmospheric and more pressure losses in the device. For example, an overpressure of the order of a few tenths of bars may be necessary.

    La figure 5 montre une variante proche de la figure 4, dans laquelle la pompe 2 est remplacée par un groupe électropompe immergé pourvu d'une pompe 14 et d'un moteur d'entraínement 15. Dans le cas des figures 4 et 5, la vanne électrique n'est pas nécessaire, car l'introduction d'air est maítrisée par le fonctionnement et l'arrêt du surpresseur 13. En effet, le surpresseur 13 fonctionne uniquement lorsqu'il faut compenser un déficit d'air dans le réservoir hydro-pneumatique et lorsque la pompe fonctionne. On peut équiper le tube d'amenée d'air 8 d'un clapet 16.FIG. 5 shows a variant close to FIG. 4, in which pump 2 is replaced by an electric pump group submerged provided with a pump 14 and a drive motor 15. In the case of FIGS. 4 and 5, the electric valve is not necessary, because the introduction of air is controlled by the operation and stopping of the booster 13. Indeed, booster 13 operates only when it is necessary to compensate for a deficit of air in the hydro-pneumatic tank and when the pump is running. We can equip the tube air intake 8 of a valve 16.

    La figure 6 montre un système hydraulique identique à celui de la figure 2, mais dans lequel le dispositif d'introduction d'air est similaire à celui de la figure 4 car PS est supérieure à la pression atmosphérique. Le dispositif d'introduction d'air est pourvu d'un surpresseur 13 et son tube 8 débouche immédiatement à l'entrée de la pompe 2 ou, ce qui est mieux, dans la zone de faible pression de la pompe 2, ce qui réduit la valeur de PS. Le surpresseur 13 peut être équipé d'une bouteille-tampon, non représentée, au cas où son débit serait trop important. Le clapet 16 ou une vanne électrique 9, est ici indispensable pour empêcher un retour de liquide vers le surpresseur 6, lorsque la pompe 2 est à l'arrêt ainsi que le surpresseur.Figure 6 shows a hydraulic system identical to that of Figure 2, but in which the air introduction device is similar to that of Figure 4 because P S is higher than atmospheric pressure. The air introduction device is provided with a booster 13 and its tube 8 opens immediately at the inlet of the pump 2 or, better still, in the low pressure area of the pump 2, which reduces the value of P S. The booster 13 can be equipped with a buffer bottle, not shown, in the event that its flow rate is too great. The valve 16 or an electric valve 9 is here essential to prevent a return of liquid to the booster 6, when the pump 2 is stopped as well as the booster.

    Sur la figure 7, le dispositif d'introduction d'air 7 est pourvu d'un surpresseur 13 immergé, le robinet de réglage 10 étant disposé à l'air libre, en amont du surpresseur 13 sur le tube d'amenée d'air 8. Le tube d'amenée d'air 8 se raccorde à une crépine ou à la zone de faible pression d'une pompe immergée, non représentée.In FIG. 7, the air introduction device 7 is provided with a submerged booster 13, the regulating valve 10 being placed in the air free, upstream of the booster 13 on the air supply tube 8. The tube air intake 8 connects to a strainer or to the weak zone pressure of a submerged pump, not shown.

    Sur la figure 8, le réservoir hydropneumatique 3 est disposé en position allongée et est relié à une portion de canalisation amont 1b et à une portion de canalisation aval 1c. Comme les deux portions de canalisation 1b et 1c débouchent directement dans le réservoir hydro-pneumatique 3 sans être reliées mutuellement, on garantit que de l'air arrivant par la portion de canalisation amont 1b reste dans le réservoir hydropneumatique 3 et n'est pas envoyé dans la portion de canalisation aval 1c. Un système équivalent peut équiper un réservoir hydro-pneumatique en position verticale, les portions de canalisation 1b et 1c arrivant alors dans le fond bombé de ce réservoir.In FIG. 8, the hydropneumatic reservoir 3 is arranged in lying position and is connected to a portion of upstream pipe 1b and to a portion of downstream pipe 1c. Like the two portions of pipe 1b and 1c open directly into the hydro-pneumatic tank 3 without being interconnected, it is guaranteed that air arriving via the upstream pipe portion 1b remains in the tank hydropneumatic 3 and is not sent to the pipeline portion downstream 1c. An equivalent system can equip a hydro-pneumatic tank in vertical position, the pipe portions 1b and 1c arriving then in the convex bottom of this tank.

    D'autres types de pièges à air sont possibles, notamment ceux qui figurent dans le brevet européen n° 93 400 771.7. Other types of air traps are possible, including those that are listed in European Patent No. 93,400,771.7.

    Dans certains cas, notamment pour les réservoirs hydropneumatiques installés à grande distance d'une pompe, et pour y introduire de l'air alors qu'ils se trouvent à une pression supérieure à la pression atmosphérique, on dispose un système déprimogène directement sur la canalisation 1 ou en dérivation de façon à créer une zone où la pression de service PS est inférieure à la pression atmosphérique.In some cases, especially for hydropneumatic tanks installed at a long distance from a pump, and to introduce air into them while they are at a pressure higher than atmospheric pressure, a pressure-reducing system is directly installed on the pipeline. 1 or bypass so as to create an area where the operating pressure P S is lower than atmospheric pressure.

    Sur la figure 9, un tube de venturi 17, qui a la forme d'un rétreint, est disposé sur la canalisation 1. Le tube de venturi 17 comprend un convergent 17a, une portion cylindrique 17b et un divergent 17c. La pression de service PS dans la portion cylindrique 17b est largement inférieure à la pression règnant dans le reste de la canalisation 1. Le tube de venturi 17 est dimensionné pour que la pression PS soit inférieure à la pression atmosphérique.In FIG. 9, a venturi tube 17, which has the shape of a constriction, is arranged on the pipe 1. The venturi tube 17 comprises a convergent 17a, a cylindrical portion 17b and a divergent 17c. The operating pressure P S in the cylindrical portion 17b is much lower than the pressure prevailing in the rest of the pipe 1. The venturi tube 17 is dimensioned so that the pressure P S is less than atmospheric pressure.

    Le dispositif d'introduction d'air 7 comprend un tube d'amenée d'air 8 en communication avec la portion cylindrique 17b, une vanne électrique 9 et un robinet de réglage 10. On parvient ainsi à introduire de l'air dans une canalisation. sous forte pression lorsque la vanne électrique 9 est ouverte.The air introduction device 7 comprises a supply tube air 8 in communication with the cylindrical portion 17b, a valve electric 9 and an adjustment valve 10. We thus manage to introduce air in a pipeline. under high pressure when the valve electric 9 is open.

    En variante et avantageusement, on peut prévoir (figures 10 et 11) un tube de dérivation 18 dont les deux extrémités sont reliées au réservoir hydropneumatique 3 dans une portion toujours en eau de celui-ci. Le tube de dérivation 18 est pourvu d'une pompe auxiliaire 19 de faible puissance mais capable de résister aux pressions élevées régnant dans le réservoir hydropneumatique, d'un tube de venturi 17 disposé en aval de la pompe auxiliaire 19 et d'un dispositif d'introduction d'air 7 relié au tube de venturi 17.Alternatively and advantageously, provision can be made (Figures 10 and 11) a bypass tube 18, the two ends of which are connected to the hydropneumatic tank 3 in a portion still in water from this one. The bypass tube 18 is provided with an auxiliary pump 19 low power but able to withstand high pressures prevailing in the hydropneumatic reservoir, of a venturi tube 17 arranged downstream of the auxiliary pump 19 and of a device for introducing air 7 connected to the venturi tube 17.

    Lorsqu'un manque d'air est à combler dans le réservoir hydropneumatique, la pompe 19 est mise en marche, ce qui entraíne la circulation de liquide dans le tube de dérivation 18. Le tube de venturi 17 crée une zone où la pression de service PS est inférieure à la pression atmosphérique. Le dispositif d'introduction d'air 7 pourvu d'un tube d'amenée d'air 8, d'un clapet 16 et d'un robinet de réglage 10, laisse entrer de l'air tant que la pompe 19 fonctionne. Lorsque celle-ci est arrêtée, le clapet 16 se referme sous la pression du liquide et l'introduction d'air est arrêtée.When a lack of air is to be filled in the hydropneumatic tank, the pump 19 is started, which causes the circulation of liquid in the bypass tube 18. The venturi tube 17 creates an area where the operating pressure P S is less than atmospheric pressure. The air introduction device 7 provided with an air supply tube 8, a valve 16 and an adjustment valve 10, allows air to enter as long as the pump 19 is operating. When the latter is stopped, the valve 16 closes under the pressure of the liquid and the introduction of air is stopped.

    La pompe auxiliaire 19, "en ligne", n'est destinée qu'à créer dans le tube 18 une circulation suffisante. Sa hauteur manométrique peut donc être peu importante et ne représenter qu'une faible fraction de celle des pompes de la station de pompage ou de la pression régnant dans le réservoir hydropneumatique.The auxiliary pump 19, "in line", is only intended to create in the tube 18 sufficient circulation. Its head can therefore be unimportant and represent only a small fraction of that of the pumping station pumps or the prevailing pressure in the hydropneumatic tank.

    Le clapet 16 peut être remplacé par une vanne électrique 9 ouverte seulement quand la pompe auxiliaire 19 fonctionne.The valve 16 can be replaced by an open electric valve 9 only when the auxiliary pump 19 is operating.

    Le système peut fonctionner quel que soit l'état de la (ou des) pompe(s) de la station de pompage : arrêt ou marche.The system can operate regardless of the state of the pump (s) of the pumping station: stop or start.

    Sur la figure 12, le réservoir hydropneumatique 3, généralement du type ballon anti-bélier comprend un organe dissymétrique 20, par exemple un clapet percé créant une perte de charge au remplissage du réservoir hydropneumatique 3. Un tube de dérivation 21 est disposé entre la canalisation 1 et le réservoir hydropneumatique 3. La perte de charge créée au remplissage du réservoir hydropneumatique 3 par l'organe dissymétrique 20 entraíne le passage d'un débit suffisant dans le tube 21 pourvu d'un tube de venturi 17 et d'un dispositif d'introduction d'air 7 pour que la pression de service PS dans la portion cylindrique du tube de venturi 17 devienne inférieure à la pression atmosphérique et permette l'introduction d'air. Le dispositif d'introduction d'air 7 comprend à la fois une vanne électrique 9 ouverte quand un déficit d'air est à combler et un clapet anti-retour 16 pour éviter une fuite de liquide par le tube 8, hors remplissage du réservoir hydropneumatique 3, mais la vanne électrique 9 étant ouverte.In FIG. 12, the hydropneumatic reservoir 3, generally of the water balloon type, comprises an asymmetrical member 20, for example a pierced valve creating a pressure drop when filling the hydropneumatic reservoir 3. A bypass tube 21 is disposed between the pipe 1 and the hydropneumatic reservoir 3. The pressure drop created during filling of the hydropneumatic reservoir 3 by the asymmetrical member 20 causes a sufficient flow to pass through the tube 21 provided with a venturi tube 17 and a device for introduction of air 7 so that the operating pressure P S in the cylindrical portion of the venturi tube 17 becomes lower than atmospheric pressure and allows the introduction of air. The air introduction device 7 includes both an electric valve 9 open when an air deficit is to be filled and a non-return valve 16 to prevent liquid leaking through the tube 8, excluding filling of the hydropneumatic tank 3, but the electric valve 9 being open.

    Grâce à l'invention, on dispose d'un dispositif d'introduction d'air dans un réservoir hydropneumatique adapté à des systèmes hydrauliques de types variés, ballons anti-bélier, réservoirs de régulation, de faible coût et de faible consommation d'énergie.Thanks to the invention, there is an air introduction device in a hydropneumatic tank suitable for systems hydraulic systems of various types, water hammer tanks, regulation, low cost and low energy consumption.

    Claims (13)

    Dispositif d'introduction d'air (7) dans un système hydraulique comprenant un réservoir hydropneumatique (3) monté sur une canalisation, caractérisé par le fait qu'il est monté de façon à introduire de l'air dans une zone en eau du système où la pression absolue Ps est soit inférieure, soit légèrement supérieure à la pression atmosphérique, le dispositif étant actif uniquement lorsqu'un manque d'air est à combler dans le réservoir hydro-pneumatique.Air introduction device (7) in a hydraulic system comprising a hydropneumatic reservoir (3) mounted on a pipeline, characterized in that it is mounted so as to introduce air into an area of system water where the pressure absolute Ps is either lower or slightly higher than the pressure atmospheric, the device being active only when a lack air must be filled in the hydro-pneumatic tank. Dispositif selon la revendication 1, caractérisé par le fait qu'il comprend un tube d'amenée d'air (8) équipé de moyens de contrôle de l'introduction d'air.Device according to claim 1, characterized in that it comprises an air intake tube (8) equipped with means for controlling the introduction of air. Dispositif selon la revendication 2, caractérisé par le fait qu'il est monté sur la canalisation entre une prise d'eau et une pompe (2).Device according to claim 2, characterized in that it is mounted on the pipe between a water intake and a pump (2). Dispositif selon la revendication 2, caractérisé par le fait que la canalisation est pourvue d'un moyen déprimogène en amont du réservoir hydropneumatique, le tube d'amenée d'air étant relié audit moyen déprimogène.Device according to claim 2, characterized in that the pipeline is provided with a pressure reducing device upstream of the hydropneumatic tank, the air supply tube being connected to said depressive form. Dispositif selon la revendication 2, caractérisé par le fait qu'il comprend un tube de dérivation (18) relié à une partie en eau du réservoir hydropneumatique, une pompe auxiliaire (19) montée sur le tube de dérivation, et un moyen déprimogène monté en aval de la pompe auxiliaire, le tube d'amenée d'air étant relié audit moyen déprimogène.Device according to claim 2, characterized in that it comprises a bypass tube (18) connected to a water part of the hydropneumatic tank, an auxiliary pump (19) mounted on the bypass tube, and a pressure reducing device mounted downstream of the auxiliary pump, the air supply tube being connected to said means depression. Dispositif selon la revendication 4 ou 5, caractérisé par le fait que le moyen déprimogène comprend un tube de venturi (17).Device according to claim 4 or 5, characterized in that that the pressure-reducing means comprises a venturi tube (17). Dispositif selon l'une quelconque des revendications 2 à 6, caractérisé par le fait qu'il comprend une vanne électrique (9) et un organe limiteur de débit (10) de l'introduction d'air disposés sur le tube d'amenée d'air.Device according to any one of Claims 2 to 6, characterized by the fact that it comprises an electric valve (9) and a flow restrictor (10) for the introduction of air arranged on the air supply tube. Dispositif selon la revendication 3, caractérisé par le fait qu'il est monté en amont d'une pompe, le tube d'amenée d'air débouchant dans une zone de faible pression de la pompe.Device according to claim 3, characterized in that it is mounted upstream of a pump, the air supply tube emerging in an area of low pump pressure. Dispositif selon la revendication 3, caractérisé par le fait qu'il est monté en amont d'une pompe immergée, le tube d'amenée d'air débouchant dans la crépine (4) d'entrée de la pompe.Device according to claim 3, characterized in that it is mounted upstream of a submerged pump, the air supply tube opening into the strainer (4) of the pump inlet. Dispositif selon la revendication 8 ou 9, caractérisé par le fait qu'il comprend un surpresseur d'air (13) monté sur le tube d'amenée d'air lorsque la pression Ps est supérieure à la pression atmosphérique.Device according to claim 8 or 9, characterized in that that it includes an air booster (13) mounted on the supply tube air when the pressure Ps is higher than atmospheric pressure. Dispositif selon l'une quelconque des revendications 1 à 9, caractérisé par le fait que la pression Ps est inférieure à la pression atmosphérique.Device according to any one of Claims 1 to 9, characterized by the fact that the pressure Ps is less than the pressure atmospheric. Pompe équipée d'un dispositif selon l'une quelconque des revendications précédentes.Pump fitted with a device according to any one of previous claims. Réservoir hydropneumatique équipé d'un dispositif selon l'une quelconque des revendications 1 à 11.Hydropneumatic tank equipped with a device according to any one of claims 1 to 11.
    EP19980401961 1997-08-01 1998-07-31 Device for introducing air into a hydropneumatic reservoir Expired - Lifetime EP0895020B1 (en)

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    FR9709902A FR2766883B1 (en) 1997-08-01 1997-08-01 AIR INTRODUCTION DEVICE FOR A HYDROPNEUMATIC TANK
    FR9709902 1997-08-01

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    EP2110597A1 (en) 2008-04-14 2009-10-21 Charlatte Reservoirs Device and method for introducing air in a hydropneumatic tank
    US8132587B2 (en) 2008-04-14 2012-03-13 Charlatte Reservoirs Apparatus and method for introducing air into a hydropneumatic reservoir

    Also Published As

    Publication number Publication date
    MA24625A1 (en) 1999-04-01
    DZ2577A1 (en) 2003-02-22
    ATE423292T1 (en) 2009-03-15
    FR2766883B1 (en) 1999-10-22
    FR2766883A1 (en) 1999-02-05
    EP0895020B1 (en) 2009-02-18
    DK0895020T3 (en) 2009-06-15
    DE69840557D1 (en) 2009-04-02
    US6047721A (en) 2000-04-11
    TNSN98147A1 (en) 2000-12-29
    ES2322303T3 (en) 2009-06-18
    PT895020E (en) 2009-05-25

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