EP1910672B1 - Hydraulic accumulator - Google Patents

Hydraulic accumulator Download PDF

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Publication number
EP1910672B1
EP1910672B1 EP06724165.3A EP06724165A EP1910672B1 EP 1910672 B1 EP1910672 B1 EP 1910672B1 EP 06724165 A EP06724165 A EP 06724165A EP 1910672 B1 EP1910672 B1 EP 1910672B1
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EP
European Patent Office
Prior art keywords
housing
hydraulic accumulator
accumulator
housing part
piston
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EP06724165.3A
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German (de)
French (fr)
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EP1910672A1 (en
Inventor
Norbert Weber
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Hydac Technology GmbH
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Hydac Technology GmbH
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
    • F04B11/0016—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a fluid spring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/021—Installations or systems with accumulators used for damping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/22—Liquid port constructions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/24—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with rigid separating means, e.g. pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/31—Accumulator separating means having rigid separating means, e.g. pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3151—Accumulator separating means having flexible separating means the flexible separating means being diaphragms or membranes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F15B2201/413—Liquid ports having multiple liquid ports

Definitions

  • the invention relates to a hydraulic accumulator, in particular in the form of a Saugstromstabitisators, with the features in the preamble of claim 1.
  • Hydro accumulators in the form of suction flow stabilizers are used in particular when piston and diaphragm pumps are used in fluid circuits, for example in supply systems, in reactors and in the chemical industry. Trouble-free pump operation is basically only possible if no cavitation occurs inside the pump and pipe vibrations are avoided.
  • a gas separation is achieved by the extremely low flow rate in the storage housing of the Saugstromstabilisators and by the deflection of the fluid flow at a deflection regularly in the form of a guide plate, which in turn benefits the trouble-free pump operation.
  • an optimal pulsation damping is achieved, based on the operating conditions of the fluid circuit.
  • Saugstromstabilisator serves as a separator regularly a storage bubble, which is usually formed of an elastomeric material.
  • the pertinent material of the bladder is susceptible to aggressive media and if the fluid stream to be transported through the hydraulic accumulator is contaminated, this can lead to mechanical damage to the bladder, which can lead to overall failure of the hydraulic system.
  • nitrogen gas is regularly used to produce the filling overpressure in the storage bladder, it can diffuse through the membrane material to the liquid side, so that gas loss occurs with increasing duration of use of the suction flow stabilizer, which reduces the effectiveness of the stabilizer and consequently its duration of use. If there are temperature fluctuations during operation of the known solution, this in turn can lead to considerable pressure changes on the bias pressure side within the reservoir bubble, with the result that the function of the suction flow stabilizer is impaired.
  • the GB 1 242 589 describes a hydraulic accumulator with a storage housing, which is provided with two fluid connections between which a deflection device is arranged, to which a housing part adjoins, which receives a separating element which separates the interior of the storage housing with respect to a storage volume, wherein the separating element from a piston or a bellows is formed.
  • the deflection device is formed by a valve closing member of the inlet valve, which is provided in the housing wall.
  • the present invention seeks to further improve the known solutions to the effect that they are long-lasting and reliable in use.
  • the deflection device consists of a partition wall, which is set in each case with an equal distance between the fluid connections.
  • the separating element is formed from a piston or from a bellows
  • metal materials can preferably be used for the separating element, which are less susceptible to aggressive media than the material of the known reservoir bladder.
  • the solution according to the invention is so far less sensitive to contamination occurring in the fluid stream passing through the stabilizer, which is particularly true when a metal bellows solution is used. Since the respective separating element in the form of a piston and / or a bellows can keep the intended preload pressure also in the long term, a functionally reliable operation is ensured in this respect also, which also contributes to the fact that the solution according to the invention is less sensitive to temperature fluctuations on the preload pressure side.
  • the Indian Fig. 1 shown hydraulic accumulator is designed in the manner of Saugstromstabilisators.
  • suction flow stabilizers are used on the suction side of piston pumps (not shown).
  • the Saugstromstabilisator has a storage housing 10 with two cover parts 12, 14, which are connected via not shown welds with the actual cylindrical storage housing 10. In the direction of the lower cover part 14, the storage housing 10 is penetrated by two fluid ports 16 which protrude with a predeterminable supernatant into the interior 18 of the storage housing 10 and are so far arranged in the same altitude to each other.
  • two mounting flanges 20 are outwardly disposed on the fluid ports, which serve the connection of Saugstromstabilisators to a fluid circuit, not shown, with delivery pump.
  • a deflection device 22 is arranged, which is designed in the manner of a deflection plate, which is fixedly mounted with its two end faces in the interior of the storage enclosure 10.
  • the pertinent deflection device 22 serves to divert the fluid flow entering the storage housing 10 substantially at right angles between the two fluid connections 16.
  • the deflecting device 22 Disposed above the deflection device-22 and approximately in the middle of the longitudinal axis 24 of the accumulator housing 10, while maintaining a predeterminable distance, the deflecting device 22 adjoins a cylindrical housing part 26, on the inside of which a piston 28 is guided in a longitudinally displaceable manner.
  • the seals and guide bands for the piston 28 have been omitted and so far only its outer peripheral recordings shown.
  • the piston 28 defines with the housing part 26 a storage volume 30 which is filled with a working medium, preferably in the form of nitrogen gas, of a predeterminable pressure.
  • a working medium preferably in the form of nitrogen gas
  • the piston 28 is provided with a cylindrical recess 32 which is attributable to the storage volume 30 of its volume.
  • a mechanical spiral spring can be used for energy storage.
  • the housing part 26 is in the direction of the Fig.1 seen down towards the deflection device 22 with a screw-in closure bottom 34 which defines a fluid passage opening 36 which opens into the interior 18 of the storage enclosure 10.
  • a screw-in closure bottom 34 which defines a fluid passage opening 36 which opens into the interior 18 of the storage enclosure 10.
  • an end cap 38 is screwed into the cylindrical housing part 26 and gradually widens outwardly into a receiving collar 40, which in turn is connected along its bottom side to the upper cover part 12 of the storage housing 10 via a weld not shown.
  • a lid with a straight structure can be used.
  • the end cap 38 has a recess 42 which is comparable in size to the recess 32 in the piston 28. Like the recess 32, the recess 42 serves to increase the storage volume 30 of the housing part 26.
  • the end cap 38 is provided with a refill 44 provided in the form of a refill valve.
  • the pertinent refilling device 44 serves to connect a refill bottle for filling the storage volume 30 with the working medium, in particular in the form of a working gas.
  • the upper end of the end cap 38 can be supported on the collar 40 via a retaining ring 46 and on the lower cover part 14, a drain plug 48 is arranged, for example, for maintenance purposes, the interior 18 of the storage housing 10 can be emptied of fluid.
  • the advantage of the piston solution is in particular that the piston 28 can "work" directly depending on the temperature in different positions within the housing part 26. In this way, there are no restricted pressure fluctuation ranges. A limitation of the maximum working capacity is ensured by the possibility of abutment of the piston 28 on the closure bottom 34. Since the piston 28 is very well sealed against the housing part 26, gas losses from the storage volume side 30 in the direction of the inside 18 of the storage housing 10 stored fluid largely excluded, so that in this respect a reliable, long-lasting operation is guaranteed.
  • a bellows 50 in particular in the form of a metal bellows, which extends with its plurality of folds while maintaining a radial distance along the inside of the cylindrical housing part 26.
  • the metal bellows 50 is in the direction of the Fig. 2 As seen at its upper end to the end cap 38 and the free lower end terminates at a closure plate 52 whose outer diameter is greater than the free diameter of the fluid passage opening 36.
  • the housing part 26 is in turn made cylindrical and ends with the fluid passage opening 36 just above the wall of the deflection device 22, which is so far only shown with its upper end.
  • the bellows 50 may in turn gas-tightly include the storage volume 30, which can be supplied via the refill 44 in the end cap 38 with a working medium, such as a working gas.
  • a working medium such as a working gas.
  • media such as fluids, for example in the form of ethyl alcohol, can be used to stiffen the bellows 50.
  • Another advantage of the solution according to the invention is the fact that the biasing pressure limited by the separating element to the maximum operating pressure of the storage solution need not be limited and it results in a marhapen frame settings, considering that the usual bladder storage solutions only pertinent pressure ratios of 4: 1 allow.

Description

Die Erfindung betrifft einen Hydrospeicher, insbesondere in Form eines Saugstromstabitisators, mit den Merkmalen im Oberbegriff von Anspruch 1.The invention relates to a hydraulic accumulator, in particular in the form of a Saugstromstabitisators, with the features in the preamble of claim 1.

Hydrospeicher in Form von Saugstromstabilisatoren werden insbesondere dann eingesetzt, wenn Kolben- und Membranpumpen in Fluidkreisläufen Anwendung finden, beispielsweise in Versorgungsanlagen, bei Reaktoren und in der chemischen Industrie. Ein störungsfreier Pumpenbetrieb ist dem Grunde nach nur möglich, wenn innerhalb der Pumpe keine Kavitation auftritt und Rohrleitungsschwingungen vermieden werden. Das relativ große Flüssigkeitsvolumen im Speichergehäuse des Saugstromstabilisators, in Bezug gesehen auf das Verdrängungsvolumen der im Fluidkreis eingesetzten Pumpe, vermindert die Beschleunigungseffekte der Flüssigkeitssäule in der zugeordneten Saugleitung, die an einen der Fluidanschlüsse des Speichergehäuses des Hydrospeichers angeschlossen ist. Auch wird durch die extrem geringe Fließgeschwindigkeit im Speichergehäuse des Saugstromstabilisators und durch die Umlenkung des Fluidstromes an einer Umlenkeinrichtung regelmäßig in Form eines Leitbleches eine Gasabscheidung erreicht, was wiederum dem störungsfreien Pumpenbetrieb zugute kommt. Durch eine Abstimmung des Füllüberdruckes, wirksam am Trennelement, wird, bezogen auf die Betriebsverhältnisse des Fluidkreises, eine optimale Pulsationsdämpfung erreicht.Hydro accumulators in the form of suction flow stabilizers are used in particular when piston and diaphragm pumps are used in fluid circuits, for example in supply systems, in reactors and in the chemical industry. Trouble-free pump operation is basically only possible if no cavitation occurs inside the pump and pipe vibrations are avoided. The relatively large volume of liquid in the storage housing of the Saugstromstabilisators, with respect to the displacement volume of the pump used in the fluid circuit, reduces the acceleration effects of the liquid column in the associated suction line, which is connected to one of the fluid ports of the storage housing of the hydraulic accumulator. Also, a gas separation is achieved by the extremely low flow rate in the storage housing of the Saugstromstabilisators and by the deflection of the fluid flow at a deflection regularly in the form of a guide plate, which in turn benefits the trouble-free pump operation. By matching the filling overpressure, effective on the separating element, an optimal pulsation damping is achieved, based on the operating conditions of the fluid circuit.

Bei den bekannten Hydrospeicherlösungen als Saugstromstabilisator dient als Trennelement regelmäßig eine Speicherblase, die üblicherweise aus einem Elastomermaterial gebildet ist. Das dahingehende Material der Speicherblase ist anfällig gegen aggressive Medien und ist der durch den Hydrospeicher zu transportierende Fluidstrom mit Verschmutzungen versehen, kann dies an der Speicherblase zu mechanischen Beschädigungen führen, was den Gesamtausfall der hydraulischen Anlage nach sich ziehen kann. Da zum Herstellen des Füllüberdruckes in der Speicherblase regelmäßig Stickstoffgas eingesetzt wird, kann dieses durch das Membranmaterial auf die Flüssigkeitsseite hin hindurch diffundieren, so dass mit zunehmender Einsatzdauer des Saugstromstabilisators ein Gasverlust eintritt, was die Wirksamkeit des Stabilisators reduziert und mithin seine Einsatzdauer. Kommt es im Betrieb der bekannten Lösung zu Temperaturschwankungen, kann dies wiederum zu erheblichen Druckänderungen auf der Vorspanndruckseite innerhalb der Speicherblase führen mit der Folge, dass die Funktion des Saugstromstabilisators beeinträchtigt ist.In the known hydraulic accumulator solutions as Saugstromstabilisator serves as a separator regularly a storage bubble, which is usually formed of an elastomeric material. The pertinent material of the bladder is susceptible to aggressive media and if the fluid stream to be transported through the hydraulic accumulator is contaminated, this can lead to mechanical damage to the bladder, which can lead to overall failure of the hydraulic system. Since nitrogen gas is regularly used to produce the filling overpressure in the storage bladder, it can diffuse through the membrane material to the liquid side, so that gas loss occurs with increasing duration of use of the suction flow stabilizer, which reduces the effectiveness of the stabilizer and consequently its duration of use. If there are temperature fluctuations during operation of the known solution, this in turn can lead to considerable pressure changes on the bias pressure side within the reservoir bubble, with the result that the function of the suction flow stabilizer is impaired.

Die GB 1 242 589 beschreibt einen Hydrospeicher mit einem Speichergehäuse, das mit zwei Fluidanschlüssen versehen ist, zwischen denen eine Umlenkeinrichtung angeordnet ist, an die ein Gehäuseteil angrenzt, das ein Trennelement aufnimmt, das das Innere.des Speichergehäuses gegenüber einem Speichervolumen abtrennt, wobei das Trennelement aus einem Kolben oder einem Balg gebildet ist. Die Umlenkeinrichtung ist durch ein Ventilschließglied des Einlassventils gebildet, das in der Gehäusewand vorgesehen ist.The GB 1 242 589 describes a hydraulic accumulator with a storage housing, which is provided with two fluid connections between which a deflection device is arranged, to which a housing part adjoins, which receives a separating element which separates the interior of the storage housing with respect to a storage volume, wherein the separating element from a piston or a bellows is formed. The deflection device is formed by a valve closing member of the inlet valve, which is provided in the housing wall.

Weitere Hydrospeicher sind aus der GB 647 347 und der GB 1 395 107 bekannt.Further hydraulic accumulators are from the GB 647,347 and the GB 1 395 107 known.

Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, die bekannten Lösungen dahingehend weiter zu verbessern, dass diese langandauernd und funktionssicher im Gebrauch sind.Based on this prior art, the present invention seeks to further improve the known solutions to the effect that they are long-lasting and reliable in use.

Eine dahingehende Aufgabe löst ein Hydrospeicher mit den Merkmalen des Patentanspruches 1 in seiner Gesamtheit.This object is achieved by a hydraulic accumulator with the features of claim 1 in its entirety.

Gemäß dem kennzeichnenden Teil des Patentanspruches 1 ist vorgesehen, dass die Umlenkeinrichtung aus einer Trennwand besteht, die mit jeweils einem gleichen Abstand zwischen die Fluidanschlüsse gesetzt ist.According to the characterizing part of claim 1 it is provided that the deflection device consists of a partition wall, which is set in each case with an equal distance between the fluid connections.

Dadurch, dass das Trennelement aus einem Kolben oder aus einem Balg gebildet ist, lassen sich vorzugsweise für das Trennelement Metallwerkstoffe einsetzen, die gegenüber aggressiven Medien weniger anfällig sind als das Material der bekannten Speicherblase. Auch ist die erfindungsgemäße Lösung insoweit weniger empfindlich gegen auftretende Verschmutzungen im den Stabilisator durchquerenden Fluidstrom, was insbesondere dann gilt, wenn eine Metallbalg-Lösung eingesetzt ist. Da das jeweilige Trennelement in Form eines Kolbens und/oder eines Balges den vorgesehenen Vorspanndruck auch langfristig halten kann, ist insoweit auch langandauernd ein funktionssicherer Betrieb gewährleistet, wozu auch mit beiträgt, dass die erfindungsgemäße Lösung gegenüber Temperaturschwankungen auf der Vorspanndruckseite weniger empfindlich ist. Insbesondere ist durch die Verwendung eines Balges, vorzugsweise aus Metallwerkstoff aufgebaut, sichergestellt, dass es auf der Vorspanndruckseite nicht zu Medien- wie Gasverlusten kommen kann. Auch lassen sich durch Einsatz der Kolbenspeicher-Lösung geringere Gasverluste bewirken als bei den bekannten Blasenspeicher-Lösungen. Mit der erfindungsgemäßen Lösung ist insoweit dann eine weitgehend hermetische Abdichtung des Speichermediums auf der Trennelementseite der Vorrichtung erreicht.Because the separating element is formed from a piston or from a bellows, metal materials can preferably be used for the separating element, which are less susceptible to aggressive media than the material of the known reservoir bladder. Also, the solution according to the invention is so far less sensitive to contamination occurring in the fluid stream passing through the stabilizer, which is particularly true when a metal bellows solution is used. Since the respective separating element in the form of a piston and / or a bellows can keep the intended preload pressure also in the long term, a functionally reliable operation is ensured in this respect also, which also contributes to the fact that the solution according to the invention is less sensitive to temperature fluctuations on the preload pressure side. In particular, it is ensured by the use of a bellows, preferably made of metal material, that it can not lead to media and gas losses on the bias pressure side. Also, by using the piston accumulator solution, lower gas losses can be achieved than in the known bladder accumulator solutions. With the solution according to the invention, a largely hermetic sealing of the storage medium on the separating element side of the device is then achieved.

Ein weiterer Vorteil bei Einsatz der erfindungsgemäßen Kolbenspeicher-Lösung ergibt sich dadurch, dass ein größeres Druckverhältnis (Vorspanndruck zu Betriebsdruck) zulässig ist als bei Blasenspeicher- und Metallbalgspeicher-Lösungen. Somit ist eine geringere Beeinflussung durch Temperaturschwankungen erreichbar.Another advantage when using the piston accumulator solution according to the invention results from the fact that a larger pressure ratio (preload pressure to operating pressure) is permissible than in bladder accumulator and Metallbalgspeicher solutions. Thus, less influence can be achieved by temperature fluctuations.

Weitere vorteilhafte Ausführungsformen der erfindungsgemäßen Hydrospeicherlösung sind Gegenstand der sonstigen Unteransprüche.Further advantageous embodiments of the hydraulic storage solution according to the invention are the subject of the other dependent claims.

Im Folgenden wird die erfindungsgemäße Hydrospeicherlösung anhand zweier Ausführungsbeispiele nach der Zeichnung näher erläutert. Dabei zeigen in prinzipieller und nicht maßstäblicher Darstellung die

Fig. 1
einen Längsschnitt durch einen Hydrospeicher mit realisierter Kolbenlösung; und
Fig. 2
teilweise im Längsschnitt, teilweise in Ansicht, eine Hydrospeicherlösung mit eingesetztem Balg.
In the following, the hydraulic accumulator solution according to the invention will be explained in more detail with reference to two exemplary embodiments according to the drawing. This show in principle and not to scale representation of the
Fig. 1
a longitudinal section through a hydraulic accumulator with realized piston solution; and
Fig. 2
partly in longitudinal section, partly in view, a hydraulic storage solution with inserted bellows.

Der in der Fig. 1 gezeigte Hydrospeicher ist in der Art eines Saugstromstabilisators ausgebildet. Insbesondere werden dahingehende Saugstromstabilisatoren auf der Saugseite von Kolbenpumpen (nicht dargestellt) eingesetzt. In der Praxis hat es sich dabei als günstig erwiesen, den Einbau des Hydrospeichers möglichst nahe an dem Ansaugstutzen der Pumpe bei senkrechter Einbaulage vorzusehen. Der Saugstromstabilisator weist ein Speichergehäuse 10 auf mit zwei Deckelteilen 12, 14, die über nicht näher dargestellte Schweißverbindungen mit dem eigentlichen zylindrischen Speichergehäuse 10 verbindbar sind. In Richtung des unteren Deckelteils 14 ist das Speichergehäuse 10 von zwei Fluidanschlüssen 16 durchgriffen, die mit einem vorgebbaren Überstand in das Innere 18 des Speichergehäuses 10 hineinragen und insoweit auch in gleicher Höhenlage zueinander angeordnet sind.The Indian Fig. 1 shown hydraulic accumulator is designed in the manner of Saugstromstabilisators. In particular, such suction flow stabilizers are used on the suction side of piston pumps (not shown). In practice, it has proven to be beneficial to provide the installation of the hydraulic accumulator as close as possible to the intake manifold of the pump in a vertical position. The Saugstromstabilisator has a storage housing 10 with two cover parts 12, 14, which are connected via not shown welds with the actual cylindrical storage housing 10. In the direction of the lower cover part 14, the storage housing 10 is penetrated by two fluid ports 16 which protrude with a predeterminable supernatant into the interior 18 of the storage housing 10 and are so far arranged in the same altitude to each other.

Über eine wiederum nicht näher dargestellte Schweißverbindung sind nach außen hin an den Fluidanschlüssen 16 zwei Befestigungsflansche 20 angeordnet, die insoweit dem Anschluß des Saugstromstabilisators an einen nicht näher dargestellten Fluidkreis mit Förderpumpe dienen.About a turn, not shown welded joint 16 two mounting flanges 20 are outwardly disposed on the fluid ports, which serve the connection of Saugstromstabilisators to a fluid circuit, not shown, with delivery pump.

In etwa mittig zwischen den Eintrittsstellen der beiden Fluidanschlüsse 16 ist eine Umlenkeinrichtung 22 angeordnet, die in der Art eines Umlenkbleches ausgebildet ist, das mit seinen beiden Stirnseiten im Inneren des Speichergehäuses 10 stationär befestigt ist. Die dahingehende Umlenkeinrichtung 22 dient dazu, den in das Speichergehäuse 10 eintretenden Fluidstrom zwischen den beiden Fluidanschlüssen 16 im Wesentlichen im rechten Winkel umzulenken. Oberhalb der Umlenkeinrichtung-22 und in etwa mittig zur Längsachse 24 des Speichergehäuses 10 angeordnet, grenzt unter Einhalten eines vorgebbaren Abstandes die Umlenkeinrichtung 22 an ein zylindrisches Gehäuseteil 26 an, an dessen Innenseite längsverfahrbar ein Kolben 28 geführt ist. Der einfacheren Darstellung wegen wurden die Dichtungen und Führungsbänder für den Kolben 28 weggelassen und insoweit nur seine außenumfangsseitigen Aufnahmen dargestellt. Der Kolben 28 begrenzt mit dem Gehäuseteil 26 ein Speichervölumen 30, das mit einem Arbeitsmedium, vorzugsweise in Form von Stickstoffgas, eines vorgebbaren Druckes befüllt ist. Um das Speichervolumen 30 zu erhöhen, ist der Kolben 28 mit einer zylindrischen Vertiefung 32 versehen, die von ihrem Volumen her dem Speichervolumen 30 zurechenbar ist. Anstatt Stickstoff als Arbeitsmedium kann zur Energiespeicherung auch eine mechanische Spiralfeder eingesetzt werden.In approximately centrally between the entry points of the two fluid ports 16, a deflection device 22 is arranged, which is designed in the manner of a deflection plate, which is fixedly mounted with its two end faces in the interior of the storage enclosure 10. The pertinent deflection device 22 serves to divert the fluid flow entering the storage housing 10 substantially at right angles between the two fluid connections 16. Disposed above the deflection device-22 and approximately in the middle of the longitudinal axis 24 of the accumulator housing 10, while maintaining a predeterminable distance, the deflecting device 22 adjoins a cylindrical housing part 26, on the inside of which a piston 28 is guided in a longitudinally displaceable manner. For ease of illustration, the seals and guide bands for the piston 28 have been omitted and so far only its outer peripheral recordings shown. The piston 28 defines with the housing part 26 a storage volume 30 which is filled with a working medium, preferably in the form of nitrogen gas, of a predeterminable pressure. In order to increase the storage volume 30, the piston 28 is provided with a cylindrical recess 32 which is attributable to the storage volume 30 of its volume. Instead of nitrogen as a working medium, a mechanical spiral spring can be used for energy storage.

Das Gehäuseteil 26 ist in Blickrichtung auf die Fig.1 gesehen nach unten hin in Richtung zu der Umlenkeinrichtung 22 mit einem einschraubbaren Abschlußboden 34 versehen, der eine Fluiddurchtrittsöffnung 36 begrenzt, die in das Innere 18 des Speichergehäuses 10 einmündet. Unmittelbar darunter angrenzend und in der Längsachse 24 des Behälters liegend, schließt sich die Trennwand der Umlenkeinrichtung 22 an. Nach oben hin ist in das zylindrische Gehäuseteil 26 eine Endkappe 38 eingeschraubt, die sich stufenweise nach außen hin verbreitert in einen Aufnahmekragen 40 einmündet, der wiederum längs seiner Bodenseite über eine nicht näher dargestellte Schweißnaht mit dem oberen Deckelteil 12 des Speichergehäuses 10 verbunden ist.The housing part 26 is in the direction of the Fig.1 seen down towards the deflection device 22 with a screw-in closure bottom 34 which defines a fluid passage opening 36 which opens into the interior 18 of the storage enclosure 10. Immediately below it and lying in the longitudinal axis 24 of the container, closes the partition wall of the deflection 22 at. Towards the top, an end cap 38 is screwed into the cylindrical housing part 26 and gradually widens outwardly into a receiving collar 40, which in turn is connected along its bottom side to the upper cover part 12 of the storage housing 10 via a weld not shown.

Bei einer nicht näher dargestellten Ausführungsform kann auch ein Deckel mit gerader Struktur eingesetzt werden. Auch die Endkappe 38 weist eine Ausnehmung 42 auf, die von ihren Ausmaßen her vergleichbar ist zu der Vertiefung 32 im Kolben 28. Ebenso wie die Vertiefung 32 dient die Ausnehmung 42 der Vergrößerung des Speichervolumens 30 des Gehäuseteils 26. Die Endkappe 38 ist mit einer Nachfülleinrichtung 44 in Form eines Nachfüllventils versehen. Die dahingehende Nachfülleinrichtung 44 dient dem Anschließen einer Nachfüllflasche zum Befüllen des Speichervolumens 30 mit dem Arbeitsmedium, insbesondere in Form eines Arbeitsgases. Zusätzlich kann sich das obere Ende der Endkappe 38 an dem Kragen 40 über einen Haltering 46 abstützen und an dem unteren Deckelteil 14 ist eine Ablaßschraube 48 angeordnet, mittels der sich beispielsweise zu Wartungszwecken das Innere 18 des Speichergehäuses 10 von Fluid entleeren läßt.In a non-illustrated embodiment, a lid with a straight structure can be used. Also, the end cap 38 has a recess 42 which is comparable in size to the recess 32 in the piston 28. Like the recess 32, the recess 42 serves to increase the storage volume 30 of the housing part 26. The end cap 38 is provided with a refill 44 provided in the form of a refill valve. The pertinent refilling device 44 serves to connect a refill bottle for filling the storage volume 30 with the working medium, in particular in the form of a working gas. In addition, the upper end of the end cap 38 can be supported on the collar 40 via a retaining ring 46 and on the lower cover part 14, a drain plug 48 is arranged, for example, for maintenance purposes, the interior 18 of the storage housing 10 can be emptied of fluid.

Der Vorteil der Kolbenlösung besteht insbesondere darin, dass der Kolben 28 abhängig von der Temperatur in unterschiedlichen Positionen innerhalb des Gehäuseteils 26 unmittelbar "arbeiten" kann. Dergestalt gibt es dann keine eingeschränkten Druckschwankungsbereiche. Eine Begrenzung des maximalen Arbeitsvermögens ist durch die Anschlagmöglichkeit des Kolbens 28 am Abschlußboden 34 gewährleistet. Da der Kolben 28 sehr gut abdichtbar ist gegenüber dem Gehäuseteil 26, sind Gasverluste von der Speichervolumenseite 30 in Richtung des im Inneren 18 des Speichergehäuses 10 bevorrateten Fluids weitgehend ausgeschlossen, so dass insoweit ein funktionssicherer, lang andauernder Betrieb gewährleistet ist.The advantage of the piston solution is in particular that the piston 28 can "work" directly depending on the temperature in different positions within the housing part 26. In this way, there are no restricted pressure fluctuation ranges. A limitation of the maximum working capacity is ensured by the possibility of abutment of the piston 28 on the closure bottom 34. Since the piston 28 is very well sealed against the housing part 26, gas losses from the storage volume side 30 in the direction of the inside 18 of the storage housing 10 stored fluid largely excluded, so that in this respect a reliable, long-lasting operation is guaranteed.

Das nachfolgende Ausführungsbeispiel nach der Fig. 2 wird nur noch insoweit erläutert, als es sich wesentlich von der Ausführungsform nach der Fig. 1 unterscheidet, wobei dieselben Bauteile wie bei der ersten Ausführungsform mit denselben Bezugszeichen versehen sind und insoweit gelten die bisherigen Ausführungen auch für die weitere Ausführungsform nach der Fig. 2.The following embodiment of the Fig. 2 is explained only insofar as it is substantially different from the embodiment of the Fig. 1 differs, wherein the same components are provided with the same reference numerals as in the first embodiment and insofar as the previous versions apply to the further embodiment of the Fig. 2 ,

Bei der Ausführungsform nach der Fig. 2 wird als Trennelement ein Balg 50, insbesondere in Form eines Metallbalges, eingesetzt, der sich mit seiner Vielzahl an Falten unter Einhalten eines radialen Abstandes entlang der Innenseite des zylindrischen Gehäuseteils 26 erstreckt. Der Metallbalg 50 ist in Blickrichtung auf die Fig. 2 gesehen an seinem oberen Ende an der Endkappe 38 festgelegt und das freie untere Ende schließt an einer Abschlußplatte 52 ab, deren Außendurchmesser größer ist als der freie Durchmesser der Fluiddurchtrittsöffnung 36. Insoweit ist für die Ausdehnung des Balges 50 also wiederum eine Begrenzung durch ein mögliches Anschlagen der Abschlußplatte 52 an der unteren Gehäuseteilwandung realisiert, die randseitig die Fluiddurchtrittsöffnung 36 begrenzt.In the embodiment of the Fig. 2 is used as a separator, a bellows 50, in particular in the form of a metal bellows, which extends with its plurality of folds while maintaining a radial distance along the inside of the cylindrical housing part 26. The metal bellows 50 is in the direction of the Fig. 2 As seen at its upper end to the end cap 38 and the free lower end terminates at a closure plate 52 whose outer diameter is greater than the free diameter of the fluid passage opening 36. In that regard, for the expansion of the bellows 50 so again a limit by a possible striking realized the end plate 52 on the lower housing part wall, the edge bounded the fluid passage opening 36.

Das Gehäuseteil 26 ist wiederum zylindrisch ausgeführt und endet mit der Fluiddurchtrittsöffnung 36 kurz oberhalb der Wandung der Umlenkeinrichtung 22, die insoweit nur mit ihrem oberen Ende dargestellt ist. Der Balg 50 kann wiederum das Speichervolumen 30 gasdicht einschließen, das über die Nachfülleinrichtung 44 in der Endkappe 38 mit einem Arbeitsmedium, wie einem Arbeitsgas, versorgbar ist. Zusätzlich zu einem Arbeitsgas können aber zur Aussteifung des Balges 50 auch Medien wie Fluide, beispielsweise in Form von Ethylalkohol, eingesetzt werden. Mit der Balglösung ist eine quasi-dichte Situation erreicht und Gasverluste treten praktisch kaum auf. Ferner ist der Balg 50 sehr günstig im Arbeitsverhalten bezogen auf die Saugstromstabilisierung und beständig gegen alle in der Praxis auftretenden zu stabilisierenden Medien. Ein weiterer Vorteil der erfindungsgemäßen Lösung ist darin zu sehen, dass der Vorspanndruck begrenzt durch das Trennelement zum maximalen Betriebsdruck der Speicherlösung nicht begrenzt zu sein braucht und es ergeben sich dergestalt im weitgezogenen Rahmen Einstellmöglichkeiten, berücksichtigend, dass die üblichen Blasenspeicherlösungen nur dahingehende Druckverhältnisse von 4:1 erlauben.The housing part 26 is in turn made cylindrical and ends with the fluid passage opening 36 just above the wall of the deflection device 22, which is so far only shown with its upper end. The bellows 50 may in turn gas-tightly include the storage volume 30, which can be supplied via the refill 44 in the end cap 38 with a working medium, such as a working gas. In addition to a working gas but also media such as fluids, for example in the form of ethyl alcohol, can be used to stiffen the bellows 50. With the bellows solution, a quasi-dense situation is achieved and gas losses occur virtually barely on. Furthermore, the bellows 50 is very favorable in terms of working behavior with respect to the suction flow stabilization and resistant to all occurring in practice to be stabilized media. Another advantage of the solution according to the invention is the fact that the biasing pressure limited by the separating element to the maximum operating pressure of the storage solution need not be limited and it results in a weitgezogenen frame settings, considering that the usual bladder storage solutions only pertinent pressure ratios of 4: 1 allow.

Claims (7)

  1. A hydraulic accumulator, in particular in the form of a suction flow stabiliser, having an accumulator housing (10) that is provided with two fluid ports (16), between which there is a deflection means (22) bordered by a housing part (26) which accommodates a separating element which separates the interior (18) of the accumulator housing (10) relative to an accumulator volume (30), the separating element being formed from a piston (28) or a bellows (50), characterised in that the deflection means (22) consists of a partition wall which is respectively positioned spaced equally between the fluid ports (16).
  2. The hydraulic accumulator according to Claim 1, characterised in that the housing part (26) has a fluid passage opening (36) on its one free end and is fastened to the accumulator housing (10) with its other end.
  3. The hydraulic accumulator according to Claim 2, characterised in that the housing part (26) is provided with a refilling means (44) on its end facing the accumulator housing (10).
  4. The hydraulic accumulator according to Claim 2 or 3, characterised in that the fluid passage opening (36) in the housing part (26) can be sealed by means of the separating element.
  5. The hydraulic accumulator according to any of Claims 1 to 4, characterised in that an accumulator medium, in particular in the form of nitrogen gas and/or in the form of a helical mechanical spring, is present in the housing (26), bordered by the separating element.
  6. The hydraulic accumulator according to any of Claims 1 to 5, characterised in that the piston (28) is guided along its outer periphery in the housing part (26).
  7. The hydraulic accumulator according to any of Claims 1 to 5, characterised in that the bellows (50) in the form of a folding bellows extends with a definable radial distance along the housing part (26).
EP06724165.3A 2005-07-30 2006-04-08 Hydraulic accumulator Active EP1910672B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005035749A DE102005035749A1 (en) 2005-07-30 2005-07-30 Hydraulic accumulator in the form of a suction current stabilizer used in piston and membrane pumps in reactors comprises a housing with a housing part receiving a separating element formed from a plunger or a bellows
PCT/EP2006/003228 WO2007014583A1 (en) 2005-07-30 2006-04-08 Hydraulic accumulator

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EP1910672A1 EP1910672A1 (en) 2008-04-16
EP1910672B1 true EP1910672B1 (en) 2014-10-08

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US (1) US20090205731A1 (en)
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JP (1) JP2009503382A (en)
DE (1) DE102005035749A1 (en)
WO (1) WO2007014583A1 (en)

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US20090205731A1 (en) 2009-08-20
WO2007014583A1 (en) 2007-02-08
DE102005035749A1 (en) 2007-02-01
JP2009503382A (en) 2009-01-29

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