EP1819924A2 - Device for damping liquid pressure waves in an element that conducts and/or stores liquid - Google Patents

Device for damping liquid pressure waves in an element that conducts and/or stores liquid

Info

Publication number
EP1819924A2
EP1819924A2 EP05819146A EP05819146A EP1819924A2 EP 1819924 A2 EP1819924 A2 EP 1819924A2 EP 05819146 A EP05819146 A EP 05819146A EP 05819146 A EP05819146 A EP 05819146A EP 1819924 A2 EP1819924 A2 EP 1819924A2
Authority
EP
European Patent Office
Prior art keywords
liquid
storing means
pressure waves
reflection
leading
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05819146A
Other languages
German (de)
French (fr)
Inventor
Uwe Iben
Klaus Habr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1819924A2 publication Critical patent/EP1819924A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets

Definitions

  • the invention relates to a device for damping fluid pressure waves in a fluid-carrying and / or storing means, in particular in a line or in a container of an injection system of a motor vehicle, according to the preamble of claim 1.
  • Pulsation or vibration dampers in fluids carrying and / or storing lines and containers are known from the prior art, in which pressure waves in additional elastic volumes, for example in membrane reservoirs, bladder accumulators, expansion hoses, etc., can run out, the pressure energy is converted into deformation energy of the elastic volumes.
  • an attenuation of pressure waves by a phasen ⁇ shifted superposition (interference) of the pressure waves is known, which is realized, for example in Pfeifen ⁇ resonators.
  • fluid pressure waves can be reduced by active pulsation reduction by means of the interference principle of action, for example by generating the phase-shifted wave with the aid of a servo valve.
  • Such pressure waves in vessels and conduits which typically include both longitudinal and transverse waves, create flows whose direction of flow depends on the location of the source of the pressure waves.
  • the problem arises that at the end of the injection Operation generated pressure waves or their reflections, which may occur when closing the nozzles of Injek ⁇ gates, ren to a reopening of the nozzle needle of the injector tier ⁇ Ren or cause an undesirable coupling of different injectors.
  • a generic device is known from DE 102 12 876 Al. It serves to dampen pressure oscillations in a high-pressure collecting chamber of a common-rail injection device of a self-igniting internal combustion engine and comprises vibration damping valves arranged in the high-pressure chamber to injector connection channels, which are acted upon by springs similar to non-return valves when the nozzle needle closes occurring pressure wave in the Hochdrucksammeiraum verhin-.
  • the invention is based on the idea of converting the oscillation energy present in the pressure waves into heat energy by single or multiple reflection at a reflection surface and at the same time separating the pressure waves into an area leading and / or storing the remainder of the liquid in which a dissipation takes place or the pressure waves are converted into heat.
  • the invention can be realized in any liquid-carrying and / or storing means, such as, for example, in lines or in containers, wherein corresponding reflection surfaces can be produced cost-effectively.
  • the region separated from the remainder of the liquid and / or storing substance is particularly preferably formed by a return channel, in the inlet region of which the liquid pressure can sometimes be focused by means of a curved reflection surface.
  • the return channel may terminate in an opening into the liquid and / or storing means opening throttle which communicates with a relation to the reflection surface and the Druckwellenausbreitungsrich ⁇ upstream or downstream region of the liquid leading and / or storage means in connection and transverse to Spreading direction of the pressure waves in the container or in the conduit is arranged.
  • the return channel is preferably in one Wall of the liquid-conducting and / or storing means and the curved reflection onscion formed on a projecting into the interior of the liquid and / or storage means hinein ⁇ projecting reflection body.
  • a flow is induced between the focus and the throttle point, and the part of the vibration energy left over after reflection of the pressure waves at the reflection surface is focused toward the return channel and converted into heat at the throttle point.
  • the DC component ie the constant portion of the flow naturally undergoes no reflection at the reflection surface and can continue to flow under only slight losses.
  • a flow cross-section is left between the reflection body and the opposite wall of the liquid-conducting and / or storing agent, which can thereby be widened.
  • the means guiding and / or storing the liquid has a recess in a region opposite the reflection body.
  • the reflection surface can be formed by a plurality of open-pore bodies arranged one behind the other like a labyrinth and by inner walls of their open pores for repeated reflection of the liquid pressure waves.
  • the interior spaces of the pores function as the area separated and / or stored by the remainder of the liquid.
  • the pressure waves between the labyrinthine arranged porous bodies themselves are reflected back and forth, with each part of the pressure waves penetrates into the pores of the body, there to convert the vibrational energy into heat.
  • Such an open-pored body can be made, for example, at least partially of a sintered material consist.
  • a high-pressure sampling chamber of a common-rail injection device of a self-igniting internal combustion engine is provided with a device according to the invention.
  • Fig.l is a cross-sectional view of a conduit which is provided with a device for damping fluid pressure waves according to a preferred embodiment
  • FIG. 2 shows a cross-sectional view of a line, which is provided with a device for damping fluid pressure waves according to another embodiment.
  • FIG. 1 shows a preferred embodiment of a device 1 for damping liquid pressure waves in a liquid, for example hydraulic oil or fuel-carrying line 2.
  • the line 2 is, for example, along a flow path 4 from a feed 6 to a drain 8 liquid flows through.
  • the device 1 may also be assigned to a container which, although it stores liquid, is provided only for temporary removal and tracking of liquid.
  • Such a container can be formed, for example, by a high-pressure sampling chamber of a common-rail injection device of a self-igniting internal combustion engine which is in flow connection with injectors which inject fuel into combustion chambers or into an intake tract of the internal combustion engine at defined injection times, wherein by means of a high-pressure pump Fuel is nachgeför- changed.
  • Such containers or lines 2 has in common that it comes through flow processes or by temporary removal or tracking of liquid to pressure fluctuations, which generate fluid pressure waves.
  • the fluid pressure waves propagate along the flow path 4 starting from the inlet 6 to the outlet 8.
  • at least one reflection surface 10 for reflecting at least part of the fluid pressure waves into a region 12 separated from the rest of the line 2 is provided for converting the oscillation energy of the fluid pressure waves into heat energy in the line 2.
  • the reflection surface 10 is formed, for example, at one of the wall 14 into the interior of the line 2 protruding, peg-like reflection body 16 and has such a curved Form that along the flow path 4 propagating fluid pressure waves, which have been reflected on the reflection surface 10, are focused in a focus area or focus 18. If necessary, a plurality of such reflection surfaces 10 or reflection body 16 can be connected in series one behind the other.
  • the focus 18 is located in the region 12 separated from the rest of the line, which is formed, for example, by a return channel 12 in whose inlet region 20 the pressure waves are reflected. Between the reflection body 16 and the wall 14 of the conduit 2, a flow cross-section 22 is left free. This can preferably be realized in that the line 2 has a stepped recess 24 in a region opposite the reflection body 16.
  • the return channel 12 is formed, for example, in the wall 14 of the conduit and runs parallel to the flow path 4. Furthermore, it ends in a transversely in the flow path 4 münden ⁇ the throttle point 26, which with respect to the reflection surface 10 and the Druckwel ⁇ lenausbreitungsraum preferably upstream Area of line 2 is in communication. Alternatively, the throttle body 26 may communicate with a downstream portion of the conduit 2. Last but not least, the pressure wave energy behind the throttle point can also be directed into a separate branch line, into a system line or into a container which is not connected to line 2.
  • the mode of operation of the device 1 is as follows: The part of the oscillation energy left over after reflection of the pressure waves at the reflection surface 10 is focused towards the inlet region 20 of the return channel 12 into the focus 18, so that a flow in FIG the line 2 between the focus 18 and the throttle point 26 is induced, which is directed against the flow in the conduit 2. At the restricted throttle point 26, the oscillation energy of the pressure waves remaining in the flow in the return channel 12 is converted into heat.
  • the DC component i. on the other hand, the constant portion of the flow in the line 2 does not receive any reflection at the reflection surface 10 and can continue to flow in the recess 24 with only slight losses through the remaining flow cross section 22.
  • the parts which remain the same and function with respect to the previous example are given the same reference numerals characterized.
  • the inner walls of open pores 28 of an open-pored region 30 of the conduit 2 serve as a reflection surface 10 for repeated reflection of the fluid pressure waves within the pores 28, whose inner spaces represent the region separated from the conduit 2.
  • the open pores 28 are formed in at least one open-pored body 30, which rather protrudes transversely from the wall 14 of the conduit 2.
  • a labyrinth open-pore body 30 are arranged, wherein the open-pore body 30 at least partially made of a sintered material.
  • Arranged below in a labyrinth-like manner is a position of the bodies 30 which is offset relative to the conduit 2 in the axial direction and which additionally additionally overlaps in the radial direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention relates to a device (1) for damping liquid pressure waves in conduits (2) and containers that conduct and/or store liquids, in particular in conduits and containers of injection systems in motor vehicles. According to the invention, to convert vibrational energy into thermal energy, at least one reflection surface (10) for reflecting at least some of the liquid pressure waves is provided in the container or in the conduit (2) in a region (12; 28) that is separate from the remainder of the container or the conduit (2).

Description

Einrichtung zur Dämpfung von Flüssigkeitsdruckwellen in einem Flüssigkeit führenden und/oder speichernden MittelDevice for damping fluid pressure waves in a liquid-conducting and / or storing means
Beschreibungdescription
Stand der TechnikState of the art
Die Erfindung betrifft eine Einrichtung zur Dämpfung von Flüssigkeitsdruckwellen in einem Flüssigkeit führenden und/oder speichernden Mittel, insbesondere in einer Leitung oder in einem Behälter einer Einspritzanlage eines Kraftfahrzeugs, gemäß dem Oberbegriff von Anspruch 1.The invention relates to a device for damping fluid pressure waves in a fluid-carrying and / or storing means, in particular in a line or in a container of an injection system of a motor vehicle, according to the preamble of claim 1.
Aus dem Stand der Technik sind Pulsations- oder Schwingungsdämpfer in Flüssigkeiten führen¬ den und/oder speichernden Leitungen und Behältern bekannt, bei welchen sich Druckwellen in zusätzlichen elastischen Volumina, beispielsweise in Membranspeichern, Blasenspeichern, Dehn- Schläuchen etc. auslaufen können, wobei die Druckenergie in Verformungsenergie der elastischen Volumina gewandelt wird. Im weiteren ist eine Dämpfung von Druckwellen durch eine phasen¬ verschobene Überlagerung (Interferenz) der Druckwellen bekannt, was beispielsweise in Pfeifen¬ resonatoren verwirklicht ist. Nicht zuletzt können Flüssigkeitsdruckwellen durch aktive Pulsati- onsreduktion mittels des Interferenz- Wirkprinzips gemindert werden, indem beispielsweise die phasenverschobene Welle mit Hilfe eines Servoventils erzeugt wird.Pulsation or vibration dampers in fluids carrying and / or storing lines and containers are known from the prior art, in which pressure waves in additional elastic volumes, for example in membrane reservoirs, bladder accumulators, expansion hoses, etc., can run out, the pressure energy is converted into deformation energy of the elastic volumes. In addition, an attenuation of pressure waves by a phasen¬ shifted superposition (interference) of the pressure waves is known, which is realized, for example in Pfeifen¬ resonators. Last but not least, fluid pressure waves can be reduced by active pulsation reduction by means of the interference principle of action, for example by generating the phase-shifted wave with the aid of a servo valve.
Solche Druckwellen in Behältern und Leitungen, welche in der Regel sowohl Longitudinalwellen als auch Transversalwellen beinhalten, erzeugen Strömungen, deren Fließrichtung von der Lage des Ursprungs der Druckwellen abhängen. Insbesondere bei Common-Rail-Einspritzeinrichtungen von selbstzündenden Brennkraftmaschinen ergibt sich das Problem, dass am Ende des Einspritz- Vorgangs erzeugte Druckwellen bzw. deren Reflexionen, die beim Schließen der Düsen der Injek¬ toren auftreten können, zu einem erneuten Öffnen der Düsennadel des betreffenden Injektors füh¬ ren bzw. eine unerwünschte Koppelung unterschiedlicher Injektoren hervorrufen.Such pressure waves in vessels and conduits, which typically include both longitudinal and transverse waves, create flows whose direction of flow depends on the location of the source of the pressure waves. Particularly in the case of common-rail injection devices of self-igniting internal combustion engines, the problem arises that at the end of the injection Operation generated pressure waves or their reflections, which may occur when closing the nozzles of Injek¬ gates, ren to a reopening of the nozzle needle of the injector füh¬ Ren or cause an undesirable coupling of different injectors.
Eine gattungsgemäße Einrichtung ist aus der DE 102 12 876 Al bekannt. Sie dient zur Dämp- fung von Druckschwingungen in einem Hochdrucksammeiraum einer Common-Rail- Einspritzeinrichtung einer selbstzündenden Brennkraftmaschine und umfasst in vom Hochdrucks¬ ammenraum zu Injektoren führenden Verbindungskanälen angeordnete, durch Federn beauf¬ schlagte Schwingungsdämpfungsventile, welche ähnlich Rückschlagventilen ein Zurücklaufen der beim Schließen der Düsennadel auftretenden Druckwelle in den Hochdrucksammeiraum verhin- dem.A generic device is known from DE 102 12 876 Al. It serves to dampen pressure oscillations in a high-pressure collecting chamber of a common-rail injection device of a self-igniting internal combustion engine and comprises vibration damping valves arranged in the high-pressure chamber to injector connection channels, which are acted upon by springs similar to non-return valves when the nozzle needle closes occurring pressure wave in the Hochdrucksammeiraum verhin-.
Vorteile der ErfindungAdvantages of the invention
Die Erfindung basiert auf dem Gedanken, die in den Druckwellen vorhandene Schwingungsener¬ gie durch ein- oder mehrfache Reflektion an einer Reflektionsfläche in Wärmeenergie umzuwan- dein und die Druckwellen zugleich in einen vom Rest des Flüssigkeit führenden und/oder spei¬ chernden Mittels separierten Bereich zu leiten, in welchem eine Dissipation stattfindet oder die Druckwellen in Wärme umgewandelt werden. Die Erfindung kann in beliebigen Flüssigkeiten führenden und/oder speichernden Mitteln, wie beispielsweise in Leitungen oder in Behältern ver¬ wirklicht werden, wobei entsprechende Reflektionsflächen kostengünstig hergestellt werden kön- nen.The invention is based on the idea of converting the oscillation energy present in the pressure waves into heat energy by single or multiple reflection at a reflection surface and at the same time separating the pressure waves into an area leading and / or storing the remainder of the liquid in which a dissipation takes place or the pressure waves are converted into heat. The invention can be realized in any liquid-carrying and / or storing means, such as, for example, in lines or in containers, wherein corresponding reflection surfaces can be produced cost-effectively.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im unabhängigen Patentanspruch angegebenen Erfindung möglich.The measures listed in the dependent claims advantageous refinements and improvements of the independent claim invention are possible.
Besonders bevorzugt wird der vom Rest des Flüssigkeit führenden und/oder speichernden Mittels separierte Bereich durch einen Rückführkanal gebildet, in dessen Einlaufbereich die Flüssigkeits- druckweilen mittels einer gekrümmten Reflektionsfläche fokussierbar sind. Der Rückführkanal kann in einer in das Flüssigkeit führende und/oder speichernde Mittel mündenden Drosselstelle enden, welche mit einem bezogen auf die Reflektionsfläche und die Druckwellenausbreitungsrich¬ tung stromaufwärtigen oder stromabwärtigen Bereich des Flüssigkeit führenden und/oder spei¬ chernden Mittels in Verbindung steht und quer zur Ausbreitungsrichtung der Druckwellen im Behälter oder in der Leitung angeordnet ist. Hierbei ist der Rückführkanal vorzugsweise in einer Wandung des Flüssigkeit führenden und/oder speichernden Mittels und die gekrümmte Reflexi¬ onsfläche an einem in das Innere des Flüssigkeit führenden und/oder speichernden Mittels hinein¬ ragenden Reflektionskörper ausgebildet. Durch diese Maßnahmen wird eine Strömung zwischen dem Fokus und der Drosselstelle induziert und der nach der Reflektion der Druckwellen an der Reflektionsfläche übriggebliebene Teil der Schwingungsenergie zum Rückführkanal hin fokus- siert und an der Drosselstelle in Wärme umgewandelt. Der Gleichanteil, d.h. der konstante Anteil der Strömung erfahrt naturgemäß keine Reflektion an der Reflektionsfläche und kann unter ledig¬ lich geringen Verlusten weiterströmen. Um den Druckwellen eine ausreichende Reflektionsfläche gegenüberzustellen und gleichzeitig aber auch einen ausreichenden Strömungsquerschnitt für den Gleichanteil des Volumenstroms zur Verfügung zu haben, ist zwischen dem Reflektionskörper und der gegenüberliegenden Wandung des Flüssigkeit führenden und/oder speichernden Mittels ein Strömungsquerschnitt freigelassen, welcher dadurch erweitert sein kann, dass das Flüssigkeit führende und/oder speichernde Mittel in einem dem Reflektionskörper gegenüberliegenden Be¬ reich eine Ausnehmung aufweist.The region separated from the remainder of the liquid and / or storing substance is particularly preferably formed by a return channel, in the inlet region of which the liquid pressure can sometimes be focused by means of a curved reflection surface. The return channel may terminate in an opening into the liquid and / or storing means opening throttle which communicates with a relation to the reflection surface and the Druckwellenausbreitungsrich¬ upstream or downstream region of the liquid leading and / or storage means in connection and transverse to Spreading direction of the pressure waves in the container or in the conduit is arranged. Here, the return channel is preferably in one Wall of the liquid-conducting and / or storing means and the curved reflection onsfläche formed on a projecting into the interior of the liquid and / or storage means hinein¬ projecting reflection body. As a result of these measures, a flow is induced between the focus and the throttle point, and the part of the vibration energy left over after reflection of the pressure waves at the reflection surface is focused toward the return channel and converted into heat at the throttle point. The DC component, ie the constant portion of the flow naturally undergoes no reflection at the reflection surface and can continue to flow under only slight losses. In order to contrast the pressure waves with a sufficient reflection surface and at the same time also to have a sufficient flow cross-section for the DC component of the volume flow, a flow cross-section is left between the reflection body and the opposite wall of the liquid-conducting and / or storing agent, which can thereby be widened. the means guiding and / or storing the liquid has a recess in a region opposite the reflection body.
Gemäß einer alternativen Ausführungsform kann die Reflektionsfläche durch mehrere, hinterein¬ ander labyrinthartig angeordnete offenporige Körper sowie durch Innenwände deren offener Po¬ ren zur wiederholten Reflektion der Flüssigkeitsdruckwellen gebildet werden. Hierbei fungieren die Innenräume der Poren als der vom Rest des Flüssigkeit führenden und/oder speichernden Mit¬ tels separierte Bereich. Weiterhin werden die Druckwellen zwischen den labyrinthartig angeord- neten porösen Körpern selbst hin und her reflektiert, wobei jeweils ein Teil der Druckwellen in die Poren der Körper eindringt, um dort die Schwingungsenergie in Wärme umzuwandeln. Dadurch findet sowohl innerhalb der offenen, von der Flüssigkeit durchspülten Poren als auch an den po¬ rösen Körpern selbst eine mehrfache Reflektion der Druckwellen statt, wodurch sich diese „tot¬ laufen". Ein solcher offenporiger Körper kann beispielsweise zumindest teilweise aus einem Sin- termaterial bestehen.According to an alternative embodiment, the reflection surface can be formed by a plurality of open-pore bodies arranged one behind the other like a labyrinth and by inner walls of their open pores for repeated reflection of the liquid pressure waves. In this case, the interior spaces of the pores function as the area separated and / or stored by the remainder of the liquid. Furthermore, the pressure waves between the labyrinthine arranged porous bodies themselves are reflected back and forth, with each part of the pressure waves penetrates into the pores of the body, there to convert the vibrational energy into heat. As a result, multiple reflection of the pressure waves takes place both within the open pores purged by the liquid and against the porous bodies themselves, as a result of which they "run dead." Such an open-pored body can be made, for example, at least partially of a sintered material consist.
Gemäß einer bevorzugten Anwendung ist ein Hochdrucksammeiraum einer Common-Rail- Einspritzvorrichtung einer selbstzündenden Brennkraftmaschine mit einer erfindungsgemäßen Einrichtung versehen.According to a preferred application, a high-pressure sampling chamber of a common-rail injection device of a self-igniting internal combustion engine is provided with a device according to the invention.
Der Aufbau der erfindungsgemäßen Einrichtung wird am besten anhand der folgenden Beschrei- bung von Ausführungsbeispielen klar. ZeichnungThe structure of the device according to the invention is best understood from the following description of exemplary embodiments. drawing
In der Zeichnung zeigtIn the drawing shows
Fig.l eine Querschnittsdarstellung einer Leitung, welche mit einer Einrichtung zur Dämpfung von Flüssigkeitsdruckwellen gemäß einer bevorzugten Ausfuhrungsform versehen ist;Fig.l is a cross-sectional view of a conduit which is provided with a device for damping fluid pressure waves according to a preferred embodiment;
Fig.2 eine Querschnittsdarstellung einer Leitung, welche mit einer Einrichtung zur Dämpfung von Flüssigkeitsdruckwellen gemäß einer weiteren Ausführungsform versehen ist.2 shows a cross-sectional view of a line, which is provided with a device for damping fluid pressure waves according to another embodiment.
Beschreibung der Ausführungsbeispiele In Fig.l ist eine bevorzugte Ausführungsform einer Einrichtung 1 zur Dämpfung von Flüssig¬ keitsdruckwellen in einer Flüssigkeiten, beispielsweise Hydrauliköl oder Kraftstoff führenden Leitung 2 gezeigt. Die Leitung 2 ist beispielsweise entlang eines Strömungswegs 4 von einem Zulauf 6 bis zu einem Ablauf 8 flüssigkeitsdurchströmt. Alternativ kann die Einrichtung 1 auch einem Behälter zugeordnet sein, welcher zwar Flüssigkeit speichert, der aber nur zum temporären Entnehmen und Nachführen von Flüssigkeit vorgesehen ist. Ein solches Behältnis kann beispiels¬ weise durch einen Hochdrucksammeiraum einer Common-Rail-Einspritzvorrichtung einer selbst¬ zündenden Brennkraftmaschine gebildet werden, welcher mit Injektoren in Strömungsverbindung steht, die zu definierten Einspritzzeitpunkten Kraftstoff in Brennräume oder in einen Ansaugtrakt der Brennkraftmaschine einspitzen, wobei mittels einer Hochdruckpumpe Kraftstoff nachgeför- dert wird. Solchen Behältern oder Leitungen 2 ist gemein, dass es durch Strömungsvorgänge bzw. durch temporäres Entnehmen oder Nachführen von Flüssigkeit zu Druckschwankungen kommt, welche Flüssigkeitsdruckwellen erzeugen. Im vorliegenden Ausführungsbeispiel der Leitung 2 wird angenommen, dass sich die Flüssigkeitsdruckwellen entlang des Strömungswegs 4 ausge¬ hend vom Zulauf 6 zum Ablauf 8 hin ausbreiten. Erfindungsgemäß ist zur Wandelung der Schwingungsenergie der Flüssigkeitsdruckwellen in Wärmeenergie in der Leitung 2 mindestens eine Reflektionsfläche 10 zur Reflektion wenigstens eines Teils der Flüssigkeitsdruckwellen in einen vom Rest der Leitung 2 separierten Bereich 12 vorgesehen.DESCRIPTION OF THE EXEMPLARY EMBODIMENTS FIG. 1 shows a preferred embodiment of a device 1 for damping liquid pressure waves in a liquid, for example hydraulic oil or fuel-carrying line 2. The line 2 is, for example, along a flow path 4 from a feed 6 to a drain 8 liquid flows through. Alternatively, the device 1 may also be assigned to a container which, although it stores liquid, is provided only for temporary removal and tracking of liquid. Such a container can be formed, for example, by a high-pressure sampling chamber of a common-rail injection device of a self-igniting internal combustion engine which is in flow connection with injectors which inject fuel into combustion chambers or into an intake tract of the internal combustion engine at defined injection times, wherein by means of a high-pressure pump Fuel is nachgeför- changed. Such containers or lines 2 has in common that it comes through flow processes or by temporary removal or tracking of liquid to pressure fluctuations, which generate fluid pressure waves. In the present exemplary embodiment of the conduit 2, it is assumed that the fluid pressure waves propagate along the flow path 4 starting from the inlet 6 to the outlet 8. According to the invention, at least one reflection surface 10 for reflecting at least part of the fluid pressure waves into a region 12 separated from the rest of the line 2 is provided for converting the oscillation energy of the fluid pressure waves into heat energy in the line 2.
Die Reflexionsfläche 10 ist beispielsweise an einem von der Wandung 14 ins Innere der Leitung 2 hineinragenden, zapfenartigen Reflektionskörper 16 ausgebildet und hat eine derart gekrümmte Form, dass sich entlang des Strömungswegs 4 ausbreitende Flüssigkeitsdruckwellen, welche an der Reflektionsfläche 10 reflektiert worden sind, in einem Fokusbereich oder Fokus 18 gebündelt werden. Bei Bedarf können mehrere solcher Reflektionsflächen 10 oder Reflektionskörper 16 in Reihe hintereinander geschaltet werden.The reflection surface 10 is formed, for example, at one of the wall 14 into the interior of the line 2 protruding, peg-like reflection body 16 and has such a curved Form that along the flow path 4 propagating fluid pressure waves, which have been reflected on the reflection surface 10, are focused in a focus area or focus 18. If necessary, a plurality of such reflection surfaces 10 or reflection body 16 can be connected in series one behind the other.
Der Fokus 18 befindet sich in dem vom Rest der Leitung separierten Bereich 12, der beispiels¬ weise durch einen Rückführkanal 12 gebildet wird, in dessen Einlaufbereich 20 die Druckwellen reflektiert werden. Zwischen dem Reflektionskörper 16 und der Wandung 14 der Leitung 2 ist ein Strömungsquerschnitt 22 freigelassen. Dies kann vorzugsweise dadurch realisiert sein, dass die Leitung 2 in einem dem Reflektionskörper 16 gegenüberliegenden Bereich eine stufenartige Aus- nehmung 24 aufweist.The focus 18 is located in the region 12 separated from the rest of the line, which is formed, for example, by a return channel 12 in whose inlet region 20 the pressure waves are reflected. Between the reflection body 16 and the wall 14 of the conduit 2, a flow cross-section 22 is left free. This can preferably be realized in that the line 2 has a stepped recess 24 in a region opposite the reflection body 16.
Der Rückführkanal 12 ist beispielsweise in der Wandung 14 der Leitung ausgebildet und verläuft parallel zum Strömungsweg 4. Weiterhin endet er in einer quer in den Strömungsweg 4 münden¬ den Drosselstelle 26, welche mit einem bezogen auf die Reflektionsfläche 10 und die Druckwel¬ lenausbreitungsrichtung vorzugsweise stromaufwärtigen Bereich der Leitung 2 in Verbindung steht. Alternativ kann die Drosselstelle 26 auch mit einem stromabwärtigen Bereich der Leitung 2 in Verbindung stehen. Nicht zuletzt kann die Druckwellenenergie hinter der Drosselstelle auch in eine separate Stichleitung, in einen Systemleitung oder auch in einen Behälter geleitet werden, welche oder welcher nicht mit der Leitung 2 in Verbindung steht.The return channel 12 is formed, for example, in the wall 14 of the conduit and runs parallel to the flow path 4. Furthermore, it ends in a transversely in the flow path 4 münden¬ the throttle point 26, which with respect to the reflection surface 10 and the Druckwel¬ lenausbreitungsrichtung preferably upstream Area of line 2 is in communication. Alternatively, the throttle body 26 may communicate with a downstream portion of the conduit 2. Last but not least, the pressure wave energy behind the throttle point can also be directed into a separate branch line, into a system line or into a container which is not connected to line 2.
Vor diesem Hintergrund ist die Funktionsweise der Einrichtung 1 wie folgt : Der nach der Reflek- tion der Druckwellen an der Reflektionsfläche 10 übriggebliebene Teil der Schwingungsenergie wird zum Einlaufbereich 20 des Rückführkanals 12 hin in den Fokus 18 fokussiert, so dass hier¬ durch eine Strömung in der Leitung 2 zwischen dem Fokus 18 und der Drosselstelle 26 induziert wird, die entgegen der Strömung in der Leitung 2 gerichtet ist. An der verengten Drosselstelle 26 wird die Schwingungsenergie der in der Strömung im Rückführkanal 12 verbliebenen Druckwel- len in Wärme umgewandelt. Der Gleichanteil, d.h. der konstante Anteil der Strömung in der Lei¬ tung 2 erfahrt hingegen keine Reflektion an der Reflektionsfläche 10 und kann unter lediglich geringen Verlusten durch den verbleibenden Strömungsquerschnitt 22 in der Ausnehmung 24 weiterströmen.Against this background, the mode of operation of the device 1 is as follows: The part of the oscillation energy left over after reflection of the pressure waves at the reflection surface 10 is focused towards the inlet region 20 of the return channel 12 into the focus 18, so that a flow in FIG the line 2 between the focus 18 and the throttle point 26 is induced, which is directed against the flow in the conduit 2. At the restricted throttle point 26, the oscillation energy of the pressure waves remaining in the flow in the return channel 12 is converted into heat. The DC component, i. on the other hand, the constant portion of the flow in the line 2 does not receive any reflection at the reflection surface 10 and can continue to flow in the recess 24 with only slight losses through the remaining flow cross section 22.
Bei dem zweiten Ausführungsbeispiel der Erfindung nach Fig.2 sind die gegenüber dem vorher- gehenden Beispiel gleichbleibenden und gleichwirkenden Teile durch die gleichen Bezugszeichen gekennzeichnet. Als Reflektionsfläche 10 dienen hier zum einen die Innenwände offener Poren 28 eines offenporigen Bereichs 30 der Leitung 2 zur wiederholten Reflektion der Flüssigkeitsdruck¬ wellen innerhalb der Poren 28, deren Innenräume den von der Leitung 2 separierten Bereich dar¬ stellen. Die offenen Poren 28 sind in wenigstens einem offenporigen Körper 30 ausgebildet, wel- eher von der Wandung 14 der Leitung 2 quer wegragt. Beispielsweise sind in der Leitung 2 meh¬ rere, hintereinander labyrinthartig angeordnete offenporige Körper 30 angeordnet, wobei die of¬ fenporigen Körper 30 zumindest teilweise aus einem Sintermaterial bestehen. Unter labyrinthartig angeordnet ist hier eine bezogen auf die Leitung 2 in axialer Richtung versetzt angeordnete Lage der Körper 30 zu verstehen, welche sich zusätzlich in radialer Richtung teilweise überdecken.In the second exemplary embodiment of the invention according to FIG. 2, the parts which remain the same and function with respect to the previous example are given the same reference numerals characterized. On the one hand, the inner walls of open pores 28 of an open-pored region 30 of the conduit 2 serve as a reflection surface 10 for repeated reflection of the fluid pressure waves within the pores 28, whose inner spaces represent the region separated from the conduit 2. The open pores 28 are formed in at least one open-pored body 30, which rather protrudes transversely from the wall 14 of the conduit 2. For example, in the line 2 meh¬ rere, arranged one behind the other like a labyrinth open-pore body 30 are arranged, wherein the open-pore body 30 at least partially made of a sintered material. Arranged below in a labyrinth-like manner is a position of the bodies 30 which is offset relative to the conduit 2 in the axial direction and which additionally additionally overlaps in the radial direction.
Dann wird die Druckwelle von den porösen Körpern 30 zum Teil in Wärme umgewandelt und zum Teil reflektiert, wobei aufgrund der radialen Überdeckung der Körper 30 der nicht in Wärme umgewandelte Teil der Druckwelle zu dem jeweils gegenüberliegen porösen Körper 30 reflektiert und dort wiederum teilweise in Wärme umgewandelt wird. Dadurch findet sowohl innerhalb der offenen, von der Flüssigkeit durchspülten Poren 28 als auch an den porösen Körpern 30 selbst eine mehrfache Reflektion der Druckwellen statt, wodurch sich diese „totlaufen". Ein solcher offenporiger Körper 30 kann beispielsweise zumindest teilweise aus einem Sintermaterial beste¬ hen. Then, the pressure wave from the porous bodies 30 is partially converted into heat and reflected in part, wherein due to the radial coverage of the body 30, the non-heat converted portion of the pressure wave to the respective opposing porous body 30 is reflected and there again partially converted into heat becomes. As a result, multiple reflection of the pressure waves takes place both inside the open pores 28 purged by the liquid and on the porous bodies 30 themselves, causing them to "run dead." Such an open-pored body 30 can be made, for example, at least partially of a sintered material ,

Claims

Patentansprüche claims
1. Einrichtung (1) zur Dämpfung von Flüssigkeitsdruckwellen in einem Flüssigkeit führen- den und/oder speichernden Mittel (2), insbesondere in einer Leitung oder in einem Behälter einer1. Device (1) for damping fluid pressure waves in a fluid-carrying and / or storing means (2), in particular in a conduit or in a container of a
Einspritzanlage eines Kraftfahrzeugs, dadurch gekennzeichnet, dass zur Wandelung von Schwingungsenergie in Wärmeenergie in dem Flüssigkeit führenden und/oder speichernden Mittel (2) mindestens eine Reflektionsfläche (10) zur Reflektion wenigstens eines Teils der Flüssigkeits¬ druckwellen in einen vom Rest des Flüssigkeit führenden und/oder speichernden Mittels (2) sepa- rierten Bereich (12; 28) vorgesehen ist.Injection system of a motor vehicle, characterized in that for the conversion of vibration energy into heat energy in the liquid leading and / or storing means (2) at least one reflection surface (10) for reflecting at least a portion of Flüssigkeits¬ pressure waves in a leading from the rest of the liquid and / or storing means (2) separated area (12; 28) is provided.
2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der vom Rest des Flüssig¬ keit führenden und/oder speichernden Mittels (2) separierte Bereich durch eine Leitung, einen Behälter oder einen Rückführkanal (12) gebildet wird, in dessen Einlaufbereich (20) die Flüssig- keitsdruckwellen mittels einer gekrümmten Reflektionsfläche (10) fokussierbar sind.2. Device according to Claim 1, characterized in that the region separated from the remainder of the liquid and / or storing means (2) is formed by a line, a container or a return channel (12), into its inlet region (20). the liquid pressure waves can be focused by means of a curved reflection surface (10).
3. Einrichtung nach Anspruch 2, dadurch gekennzeichnet, dass der Rückführkanal (12) in einer in das Flüssigkeit führende und/oder speichernde Mittel (2) mündenden Drosselstelle (26) endet.3. Device according to claim 2, characterized in that the return channel (12) in a leading into the liquid and / or storing means (2) opening throttle point (26) ends.
4. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Drosselstelle (26) mit einem bezogen auf die Reflektionsfläche (10) und die Druckwellenausbreitungsrichtung stro- maufwärtigen oder stromabwärtigen Bereich des Flüssigkeit führenden und/oder speichernden Mittels (2) in Verbindung steht. 4. Device according to claim 3, characterized in that the throttle point (26) with a relation to the reflection surface (10) and the Druckwellenausbreitungsrichtung up-stream or downstream region of the liquid leading and / or storing means (2) is in communication.
5. Einrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass der Rückfuhrkanal (12) in einer Wandung (14) des Flüssigkeit führenden und/oder speichernden Mittels (2) ausge¬ bildet ist.5. Device according to claim 3 or 4, characterized in that the return passage (12) in a wall (14) of the liquid leading and / or storing means (2) ausge¬ is formed.
6. Einrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die gekrümmte Reflexions¬ fläche (10) an einem in das Innere des Flüssigkeit führenden und/oder speichernden Mittels (2) hineinragenden Reflektionskörper (16) ausgebildet ist.6. A device according to claim 5, characterized in that the curved reflection surface (10) is formed on a leading into the interior of the liquid and / or storing means (2) projecting reflection body (16).
7. Einrichtung nach Anspruch 6, dadurch gekennzeichnet, dass zwischen dem Reflekti- onskörper (16) und der Wandung (14) des Flüssigkeit führenden und/oder speichernden Mittels7. Device according to claim 6, characterized in that between the reflection onskörper (16) and the wall (14) of the liquid leading and / or storing agent
(2) ein Strömungsquerschnitt (22) freigelassen ist.(2) a flow cross-section (22) is left free.
8. Einrichtung nach Anspruch 7, dadurch gekennzeichnet, dass das Flüssigkeit führende und/oder speichernde Mittel (2) in einem dem Reflektionskörper (16) gegenüberliegenden Bereich eine Ausnehmung (24) aufweist.8. A device according to claim 7, characterized in that the liquid leading and / or storing means (2) in a reflection body (16) opposite region has a recess (24).
9. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Reflektionsfläche durch mehrere, hintereinander labyrinthartig angeordnete offenporige Körper (30) sowie durch Innenwände deren offener Poren (28) zur wiederholten Reflektion der Flüssigkeitsdruckwellen gebildet wird.9. Device according to claim 1, characterized in that the reflection surface is formed by a plurality of successively arranged in a labyrinth-like open-pore body (30) and by inner walls whose open pores (28) for repeated reflection of the liquid pressure waves.
10. Einrichtung nach Anspruch 9, dadurch gekennzeichnet, dass die offenporigen Körper (30) von einer Wandung (14) des Flüssigkeit führenden und/oder speichernden Mittels (2) quer wegragen.10. Device according to claim 9, characterized in that the open-pored body (30) projecting transversely from a wall (14) of the liquid-carrying and / or storing means (2).
11. Einrichtung nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass die offenporigen Körper (30) zumindest teilweise aus einem Sintermaterial bestehen.11. Device according to claim 9 or 10, characterized in that the open-pore body (30) at least partially consist of a sintered material.
12. Hochdrucksammeiraum einer Common-Rail-Einspritzvorrichtung einer selbstzündenden Brennkraftmaschine, dadurch gekennzeichnet, dass er mit einer Einrichtung nach wenigstens einem der vorhergehenden Ansprüche versehen ist. 12. Hochdrucksammeiraum a common rail injection device of a self-igniting internal combustion engine, characterized in that it is provided with a device according to at least one of the preceding claims.
EP05819146A 2004-11-23 2005-11-18 Device for damping liquid pressure waves in an element that conducts and/or stores liquid Withdrawn EP1819924A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004056414A DE102004056414A1 (en) 2004-11-23 2004-11-23 Device for damping fluid pressure waves in a liquid-conducting and / or storing means
PCT/EP2005/056046 WO2006056552A2 (en) 2004-11-23 2005-11-18 Device for damping liquid pressure waves in an element that conducts and/or stores liquid

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EP1819924A2 true EP1819924A2 (en) 2007-08-22

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EP (1) EP1819924A2 (en)
JP (1) JP2008520892A (en)
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US20080127941A1 (en) 2008-06-05

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