EP3084212B1 - Conveying device for a fluid - Google Patents

Conveying device for a fluid Download PDF

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Publication number
EP3084212B1
EP3084212B1 EP14833336.2A EP14833336A EP3084212B1 EP 3084212 B1 EP3084212 B1 EP 3084212B1 EP 14833336 A EP14833336 A EP 14833336A EP 3084212 B1 EP3084212 B1 EP 3084212B1
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EP
European Patent Office
Prior art keywords
piston rod
piston
pressure
cylinder
double
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EP14833336.2A
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German (de)
French (fr)
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EP3084212A2 (en
Inventor
Gerhard Stock
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STOCK, GERHARD
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Individual
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    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0435—Arrangements for disconnecting the pistons from the actuated cam
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/045—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being eccentrics

Definitions

  • the invention relates to a delivery device for a fluid with a motor coupled to a pump.
  • Such conveyors are widely known and are used, for example, as charge pumps that are connected to the environment in order to increase a boost pressure in an engine, or as feed pumps, for example for water, so-called house water pumps, which feed water from a well into a house water supply network.
  • the DE 10 2008 045 730 A1 discloses a fluid delivery device with a motor coupled to a pump.
  • the pump comprises a double piston slidably mounted in a cylinder with a one-sided piston rod which is non-positively connected to the engine, the cylinder being coupled to a supply on the loading side facing the piston rod and to a supply on the working side facing away from the piston rod via a valve is.
  • the piston rod is preloaded with a spring in relation to the cylinder for a positive connection to the engine.
  • the invention has for its object to provide a conveyor of the type mentioned that works with low energy requirements with little loss and has a simple mechanical structure and a relatively high level of security.
  • the supply can be infinite, for example the environment if the fluid is air.
  • the supply can of course comprise a container or a pipeline or some other hollow body.
  • a working circuit with a working machine can be provided on the working side of the double piston, which is opposite the side having the piston rod, the loading side. It is but for example the arrangement of any pipeline in which a pressure is to be increased is also conceivable, for example a hydraulic line of a hydraulic device. The invention is described below with reference to a working cycle, which, however, as explained, only represents an example on the working side.
  • the piston rod is no longer connected to the drive, in particular a motor, and the pump is switched off after reaching the target pressure and requires no energy.
  • the drive can of course remain in operation.
  • the piston rod comes into contact with the slow-running motor again and the self-regulating pump is started to increase the pressure.
  • the pump is switched on and off purely mechanically and neither pressure sensors nor other electrical components are required.
  • the pressure on the output side of the double piston increases, the energy is reduced and the pump operates at maximum pressure with a minimum of force.
  • the conveyor has a relatively small structure at low manufacturing costs.
  • the double piston is a piston that can work on both sides, that is, sucking in on one side and compressing it on the other side.
  • the valves are preferably designed as check valves and are arranged such that the first check valve used in the working circuit closes when the pressure in the cylinder on the side of the double piston remote from the piston rod increases, and the second check valve inserted in a line leading to the supply line in the event of a pressure rise in the Cylinder on the side of the double piston facing away from the piston rod is open.
  • the check valves are mechanical components.
  • the first and second check valves open corresponding flow cross-sections and, by connecting the supply and the charging circuit coupled with it to the cylinder on the side facing the piston rod, the pressure on this side of the double piston also increases, which causes the piston rod to shift As a result, the force for moving the piston rod to increase the pressure on the side of the double piston remote from the piston rod is reduced.
  • the surfaces of the double piston on both sides are expediently dimensioned such that the pressure on the side facing away from the piston rod is proportional to the pressure on the side facing the piston rod and corresponds to the ratio of the boost pressure to the target pressure.
  • the target pressure in the working circuit corresponds to the pressure in the charging circuit, which includes the supply, Thus, for example, it is also connected to the environment, multiplied by the factor which results from the division of the two effective piston areas of the double piston, which is always greater than 1, since the effective piston area on the side having the piston rod is smaller than that on the opposite side Page. Since the target pressure is determined by the ratio of the two effective piston areas of the double piston, the target pressure cannot be exceeded and there is a relatively high level of security without the arrangement of a monitoring sensor system and control.
  • the free end face of the piston rod is assigned to an eccentric disk of a shaft of the motor.
  • the piston rod is not in contact with the eccentric disc and, in the event of a pressure drop, it comes into contact such that its free end rests on the circumference of the eccentric disc and the piston is displaceable. Accordingly, the piston rod is displaced in the event of a pressure drop such that its free end rests on the circumference of the eccentric disk.
  • the double piston is acted upon by a force acting in the direction of the piston rod.
  • the force can be generated, for example, by means of a tension spring, which is arranged on the one hand on the piston rod and on the other hand in a stationary manner, for example on a housing part. It is also possible within the cylinder to arrange a compression spring acting on the double piston.
  • the supply is expediently designed in the vicinity or as a storage tank.
  • the storage tank can be a container filled with a liquid.
  • a liquid in particular oil, at least in the working circuit. If the supply is in connection with the environment, it is necessary to load the piston in the direction of the eccentric disk, for example by means of a spring.
  • the conveyor can be operated with any fluid and not exclusively with a liquid, in particular use in connection with air is possible.
  • the conveying device can be used, for example, in connection with any work machine or a compressed air brake of a motor vehicle, the supply being formed by the environment when used in connection with a compressed air brake and the working circuit corresponding to the brake lines.
  • FIG. Of the drawing shows a schematic representation of a conveyor device according to the invention.
  • the conveying device for a fluid comprises a pump 1, which is essentially composed of a double piston 3, which is displaceably mounted in a cylinder 2 and has a piston rod 4 on one side.
  • a pump 1 which is essentially composed of a double piston 3, which is displaceably mounted in a cylinder 2 and has a piston rod 4 on one side.
  • the free end of the piston rod 4 is assigned to an eccentric disk 5, which is connected to a motor.
  • the cylinder 2 is connected on the one hand via a pipeline 6 with an inserted check valve 7 to a working circuit and on the other hand with a storage tank 8 of a supply 9.
  • the storage tank 8 is fluidically coupled to the cylinder 2 on the side of the double piston 3 facing the piston rod 4 via a pipe 10 and on the side facing away from the piston rod 4 via a line 11 with an inserted check valve 12.
  • the pressure in the working circuit rises, it also rises in the storage tank 8 and acts on the double piston 3 on the side with the piston rod 4.
  • the double piston 3 is displaced upwards and the piston rod 4 is no longer located after a desired pressure has been reached on the eccentric disc.
  • the ratio of the two areas of the Double piston 3 1.6 wherein this ratio of the areas with and without piston rod 4 is to be varied in particular by the diameter of the piston rod 4 and corresponds to the ratio of the target pressure to the boost pressure in the working circuit.
  • the piston rod 4 is connected to the eccentric disk 5 driven by the motor until the boost pressure in the working circuit corresponds to the target pressure. After the target pressure has been reached on the side of the double piston 3 without the piston rod 4, i.e.
  • the boost pressure on the side of the double piston 3 with the piston rod 4 is 1.6 times less than the target pressure in the exemplary embodiment.
  • the double piston 3 In order to work with a boost pressure on the side of the double piston 3 with the piston rod 4, which corresponds to the ambient pressure, the double piston 3 is subjected to a force in the direction of arrow 13 in which, for example, a tension spring on the piston rod 4 or a compression spring on the Surface of the double piston 3 is arranged without piston rod 4.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Description

Die Erfindung bezieht sich auf eine Fördereinrichtung für ein Fluid mit einem mit einer Pumpe gekoppelten Motor.The invention relates to a delivery device for a fluid with a motor coupled to a pump.

Derartige Fördereinrichtungen sind vielfach bekannt und dienen beispielsweise als Ladepumpen, die mit der Umgebung in Verbindung stehen, um einen Ladedruck in einem Motor, zu erhöhen, oder als Förderpumpen, beispielsweise für Wasser, sogenannte Hauswasserpumpen, die Wasser aus einem Brunnen in ein Hauswasserleitungsnetz einspeisen.Such conveyors are widely known and are used, for example, as charge pumps that are connected to the environment in order to increase a boost pressure in an engine, or as feed pumps, for example for water, so-called house water pumps, which feed water from a well into a house water supply network.

Die DE 10 2008 045 730 A1 offenbart eine Fördereinrichtung für ein Fluid mit einem mit einer Pumpe gekoppelten Motor. Die Pumpe umfasst einen in einem Zylinder verschiebbar gelagerten Doppelkolben mit einer einseitigen Kolbenstange, die kraftschlüssig mit dem Motor in Verbindung steht, wobei der Zylinder auf der der Kolbenstange zugewandten Ladeseite mit einem Vorrat und auf der der Kolbenstange abgewandten Arbeitsseite über ein Ventil mit einem Arbeitsreislauf gekoppelt ist. Die Kolbenstange ist zur kraftschlüssigen Verbindung mit dem Motor gegenüber dem Zylinder mit einer Feder vorgespannt.
Der Erfindung liegt die Aufgabe zugrunde, eine Fördereinrichtung der eingangs genannten Art zu schaffen, die bei einem geringen Energiebedarf mit geringen Verlusten arbeitet und dabei einen einfachen mechanischen Aufbau sowie eine relativ hohe Sicherheit aufweist.The DE 10 2008 045 730 A1 discloses a fluid delivery device with a motor coupled to a pump. The pump comprises a double piston slidably mounted in a cylinder with a one-sided piston rod which is non-positively connected to the engine, the cylinder being coupled to a supply on the loading side facing the piston rod and to a supply on the working side facing away from the piston rod via a valve is. The piston rod is preloaded with a spring in relation to the cylinder for a positive connection to the engine.
The invention has for its object to provide a conveyor of the type mentioned that works with low energy requirements with little loss and has a simple mechanical structure and a relatively high level of security.

Erfindungsgemäß wird die Aufgabe durch die Merkmale des unabhängigen Anspruchs gelöst.According to the invention, the object is achieved by the features of the independent claim.

Die Unteransprüche stellen vorteilhafte Ausgestaltungen der Erfindung dar.The subclaims represent advantageous embodiments of the invention.

Eine Fördereinrichtung für ein Fluid umfasst einen mit einer Pumpe gekoppelten Motor. Die Pumpe

  • umfasst einen in einem Zylinder verschiebbar gelagerten Doppelkolben mit einer einseitigen Kolbenstange, die kraftschlüssig derart lösbar mit dem Motor in Verbindung steht, dass eine Verbindung nur dann gegeben ist, wenn der Ladedruck auf einer Arbeitsseite des Doppelkolbens kleiner als ein Soll-Druck ist,
  • der Zylinder ist auf der der Kolbenstange zugewandten Seite mit einem Vorrat gekoppelt und
  • der Zylinder steht auf der der Kolbenstange abgewandten Seite über Ventile mit der Arbeitsseite und dem Vorrat in Verbindung.
A fluid delivery device includes a motor coupled to a pump. The pump
  • comprises a double piston slidably mounted in a cylinder with a one-sided piston rod which is non-positively connected to the engine in such a way that a connection is only given if the boost pressure on one working side of the double piston is less than a target pressure,
  • the cylinder is coupled to a supply on the side facing the piston rod and
  • the cylinder on the side facing away from the piston rod is connected to the working side and the supply via valves.

Der Vorrat kann unendlich groß sein, beispielsweise die Umgebung, falls das Fluid Luft ist. Selbstverständlich kann der Vorrat bei einem lagerbaren und/oder förderbaren Fluid einen Behälter oder eine Rohrleitung oder einen sonstigen Hohlkörper umfassen.The supply can be infinite, for example the environment if the fluid is air. In the case of a storable and / or conveyable fluid, the supply can of course comprise a container or a pipeline or some other hollow body.

Auf der Arbeitsseite des Doppelkolbens, die der die Kolbenstange aufweisenden Seite, der Ladeseite, gegenüberliegt, kann ein Arbeitskreislauf mit einer Arbeitsmaschine vorgesehen sein. Es ist aber beispielsweise auch die Anordnung einer beliebigen Rohrleitung, in der ein Druck erhöht werden soll, denkbar, beispielsweise eine Hydraulikleitung einer hydraulischen Vorrichtung. Im Folgenden wird die Erfindung anhand eines Arbeitskreislaufs beschrieben, der aber, wie erläutert, lediglich ein Beispiel auf der Arbeitsseite darstellt.A working circuit with a working machine can be provided on the working side of the double piston, which is opposite the side having the piston rod, the loading side. It is but for example the arrangement of any pipeline in which a pressure is to be increased is also conceivable, for example a hydraulic line of a hydraulic device. The invention is described below with reference to a working cycle, which, however, as explained, only represents an example on the working side.

Entspricht der Ladedruck im Arbeitskreislauf auf der Arbeitsseite des Doppelkolbens einem Soll-Druck, dann ist die Kolbenstange nicht mehr mit dem Antrieb, insbesondere einem Motor, verbunden und die Pumpe ist nach dem Erreichen des Soll-Drucks abgeschaltet und benötigt keine Energie. Der Antrieb kann selbstverständlich in Betrieb bleiben. Unterschreitet der Druck im Ladekreislauf den Soll-Druck, dann kommt die Kolbenstange wieder in Verbindung mit dem langsam laufenden Motor und die selbstregelnde Pumpe wird zur Druckerhöhung in Betrieb gesetzt. Das Zu- und Abschalten der Pumpe erfolgt rein mechanisch und es werden weder Drucksensoren noch sonstige elektrische Bauteile benötigt. Mit einem steigenden Druck auf der Ausgangsseite des Doppelkolbens geht eine Reduzierung der Energie einher und die Pumpe arbeitet bei einem maximalen Druck mit einer minimalen Kraft. Mit der geräusch- und verschleißarmen Fördereinrichtung, die sowohl für hydraulische als auch für pneumatische Anwendungen geeignet ist, sind nahezu beliebige Drücke erzielbar. Dabei weist die Fördereinrichtung bei niedrigen Herstellkosten einen relativ kleinen Aufbau auf.If the boost pressure in the working circuit on the working side of the double piston corresponds to a target pressure, then the piston rod is no longer connected to the drive, in particular a motor, and the pump is switched off after reaching the target pressure and requires no energy. The drive can of course remain in operation. If the pressure in the charging circuit falls below the target pressure, the piston rod comes into contact with the slow-running motor again and the self-regulating pump is started to increase the pressure. The pump is switched on and off purely mechanically and neither pressure sensors nor other electrical components are required. As the pressure on the output side of the double piston increases, the energy is reduced and the pump operates at maximum pressure with a minimum of force. With the low-noise and low-wear conveyor, which is suitable for both hydraulic and pneumatic applications, almost any pressure can be achieved. The conveyor has a relatively small structure at low manufacturing costs.

Bei dem Doppelkolben handelt es sich um einen Kolben, der beidseitig Arbeit verrichten kann, also auf einer Seite ansaugt und auf der anderen Seite verdichtet.The double piston is a piston that can work on both sides, that is, sucking in on one side and compressing it on the other side.

Vorzugsweise sind die Ventile als Rückschlagventile ausgebildet und derart angeordnet, dass das in den Arbeitskreislauf eingesetzte erste Rückschlagventil bei einem Druckanstieg in dem Zylinder auf der der Kolbenstange abgewandten Seite des Doppelkolbens geschlossen und das in eine zum Vorrat führende Leitung eingesetzte zweite Rückschlagventil bei einem Druckanstieg in dem Zylinder auf der der Kolbenstange abgewandten Seite des Doppelkolbens geöffnet ist. Bei den Rückschlagventilen handelt es sich um mechanische Bauteile. Bei einem Druckanstieg im Arbeitskreislauf öffnen das erste und das zweite Rückschlagventil entsprechende Strömungsquerschnitte und über die Verbindung des Vorrats sowie des damit gekoppelten Ladekreislaufs mit dem Zylinder auf der der Kolbenstange zugewandten Seite steigt auch der Druck auf dieser Seite des Doppelkolbens, was eine Verlagerung der Kolbenstange zur Folge hat, wodurch die Kraft zur Bewegung der Kolbenstange zur Erhöhung des Drucks auf der der Kolbenstange abgewandten Seite des Doppelkolbens reduziert ist.The valves are preferably designed as check valves and are arranged such that the first check valve used in the working circuit closes when the pressure in the cylinder on the side of the double piston remote from the piston rod increases, and the second check valve inserted in a line leading to the supply line in the event of a pressure rise in the Cylinder on the side of the double piston facing away from the piston rod is open. The check valves are mechanical components. When the pressure in the working circuit rises, the first and second check valves open corresponding flow cross-sections and, by connecting the supply and the charging circuit coupled with it to the cylinder on the side facing the piston rod, the pressure on this side of the double piston also increases, which causes the piston rod to shift As a result, the force for moving the piston rod to increase the pressure on the side of the double piston remote from the piston rod is reduced.

Zweckmäßigerweise sind die beiderseitigen Flächen des Doppelkolbens derart bemessen, dass der Druck auf der der Kolbenstange abgewandten Seite zu dem Druck auf der der Kolbenstange zugewandten Seite proportional ist und dem Verhältnis des Ladedrucks zu dem Soll-Druck entspricht. Der Soll-Druck im Arbeitskreislauf entspricht dem Druck im Ladekreislauf, der den Vorrat umfasst, also beispielsweise auch an die Umgebung angeschlossen ist, multipliziert mit dem Faktor, der sich der Division der beiden wirksamen Kolbenflächen des Doppelkolbens ergibt, der stets größer 1 ist, da die wirksame Kolbenfläche auf der die Kolbenstange aufweisenden Seite kleiner ist, als die auf der gegenüberliegenden Seite. Da der Soll-Druck durch das Verhältnis der beiden wirksamen Kolbenflächen des Doppelkolbens bestimmt ist, kann der Soll-Druck nicht überschritten werden und es herrscht eine Verhältnismäßig hohe Sicherheit ohne die Anordnung einer Überwachungssensorik und -steuerung.The surfaces of the double piston on both sides are expediently dimensioned such that the pressure on the side facing away from the piston rod is proportional to the pressure on the side facing the piston rod and corresponds to the ratio of the boost pressure to the target pressure. The target pressure in the working circuit corresponds to the pressure in the charging circuit, which includes the supply, Thus, for example, it is also connected to the environment, multiplied by the factor which results from the division of the two effective piston areas of the double piston, which is always greater than 1, since the effective piston area on the side having the piston rod is smaller than that on the opposite side Page. Since the target pressure is determined by the ratio of the two effective piston areas of the double piston, the target pressure cannot be exceeded and there is a relatively high level of security without the arrangement of a monitoring sensor system and control.

Zur Realisierung eines im Aufbau einfachen Antriebs für die Pumpe ist die Kolbenstange mit ihrer freien Stirnseite einer Exzenterscheibe einer Welle des Motors zugeordnet. Beim Erreichen des Soll-Drucks im Ladekreislauf ist die Kolbenstange nicht in Kontakt mit der Exzenterscheibe und bei einem Druckabfall kommt sie derart in Anlage, dass ihr freies Ende auf dem Umfang der Exzenterscheibe aufliegt und der Kolben verschiebbar ist. Dementsprechend wird die Kolbenstange bei einem Druckabfall derart verschoben, dass ihr freies Ende auf dem Umfang der Exzenterscheibe aufliegt.In order to implement a drive for the pump that is simple in construction, the free end face of the piston rod is assigned to an eccentric disk of a shaft of the motor. When the target pressure in the charging circuit is reached, the piston rod is not in contact with the eccentric disc and, in the event of a pressure drop, it comes into contact such that its free end rests on the circumference of the eccentric disc and the piston is displaceable. Accordingly, the piston rod is displaced in the event of a pressure drop such that its free end rests on the circumference of the eccentric disk.

Um die Fördereinrichtung auch bei einem auf der Ansaugseite herrschenden Druck, der dem Umgebungsdruck entspricht, betreiben zu können, ist der Doppelkolben mit einer in Richtung der Kolbenstange wirksamen Kraft beaufschlagt. Die Kraft kann beispielsweise mittels einer Zugfeder erzeugt werden, die zum einen an der Kolbenstange und zum anderen ortsfest, beispielsweise an einem Gehäuseteil, angeordnet ist. Es ist auch möglich, innerhalb des Zylinders eine den Doppelkolben beaufschlagende Druckfeder anzuordnen.In order to be able to operate the delivery device even at a pressure prevailing on the suction side which corresponds to the ambient pressure, the double piston is acted upon by a force acting in the direction of the piston rod. The force can be generated, for example, by means of a tension spring, which is arranged on the one hand on the piston rod and on the other hand in a stationary manner, for example on a housing part. It is also possible within the cylinder to arrange a compression spring acting on the double piston.

Weiterhin ist zweckmäßigerweise der Vorrat die Umgebung oder als ein Speichertank ausgebildet. Bei dem Speichertank kann es sich um einen mit einer Flüssigkeit gefüllten Behälter handeln. Darüber hinaus befindet sich zumindest in dem Arbeitskreislauf eine Flüssigkeit, insbesondere Öl. Steht der Vorrat mit der Umgebung in Verbindung, ist es erforderlich, den Kolben beispielsweise mittels einer Feder in Richtung der Exzenterscheibe zu belasten. Selbstverständlich kann die Fördereinrichtung mit einem beliebigen Fluid betrieben werden und nicht ausschließlich mit einer Flüssigkeit, insbesondere ist ein Einsatz im Zusammenhang mit Luft möglich.Furthermore, the supply is expediently designed in the vicinity or as a storage tank. The storage tank can be a container filled with a liquid. In addition, there is a liquid, in particular oil, at least in the working circuit. If the supply is in connection with the environment, it is necessary to load the piston in the direction of the eccentric disk, for example by means of a spring. Of course, the conveyor can be operated with any fluid and not exclusively with a liquid, in particular use in connection with air is possible.

Die Fördereinrichtung kann beispielsweise im Zusammenhang mit einer beliebigen Arbeitsmaschine oder einer Druckluftbremse eines Kraftfahrzeugs eingesetzt werden, wobei bei einer Verwendung im Zusammenhang mit einer Druckluftbremse der Vorrat durch die Umgebung gebildet wird und der Arbeitskreislauf den Bremsleitungen entspricht.The conveying device can be used, for example, in connection with any work machine or a compressed air brake of a motor vehicle, the supply being formed by the environment when used in connection with a compressed air brake and the working circuit corresponding to the brake lines.

Es versteht sich, dass die vorstehend genannten und nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen verwendbar sind. Der Rahmen der Erfindung ist nur durch die Ansprüche definiert.It goes without saying that the features mentioned above and still to be explained below can be used not only in the respectively specified combination but also in other combinations. The scope of the invention is defined only by the claims.

Die Erfindung wird im Folgenden anhand eines Ausführungsbeispiels unter Bezugnahme auf die zugehörige Zeichnung näher erläutert.The invention is explained in more detail below using an exemplary embodiment with reference to the associated drawing.

Die einzige Fig. der Zeichnung zeigt eine schematische Darstellung einer Fördereinrichtung nach der Erfindung.The only FIG. Of the drawing shows a schematic representation of a conveyor device according to the invention.

Die Fördereinrichtung für ein Fluid, insbesondere eine Flüssigkeit, umfasst eine Pumpe 1, die im Wesentlichen aus einem in einem Zylinder 2 verschiebbar gelagerten Doppelkolben 3 mit einer einseitigen Kolbenstange 4 zusammengesetzt ist. Zum Antrieb des Doppelkolbens 3 zum Fördern des Fluides ist das freie Ende der Kolbenstange 4 einer Exzenterscheibe 5 zugeordnet, die mit einem Motor in Verbindung steht. Der Zylinder 2 ist zum einen über eine Rohrleitung 6 mit einem eingesetzten Rückschlagventil 7 mit einem Arbeitskreislauf und zum anderen mit einem Speichertank 8 eines Vorrats 9 verbunden. Der Speichertank 8 ist auf der der Kolbenstange 4 zugewandten Seite des Doppelkolbens 3 über ein Rohr 10 und auf der der Kolbenstange 4 abgewandten Seite über eine Leitung 11 mit einem eingesetzten Rückschlagventil 12 mit dem Zylinder 2 strömungstechnisch gekoppelt.The conveying device for a fluid, in particular a liquid, comprises a pump 1, which is essentially composed of a double piston 3, which is displaceably mounted in a cylinder 2 and has a piston rod 4 on one side. To drive the double piston 3 for conveying the fluid, the free end of the piston rod 4 is assigned to an eccentric disk 5, which is connected to a motor. The cylinder 2 is connected on the one hand via a pipeline 6 with an inserted check valve 7 to a working circuit and on the other hand with a storage tank 8 of a supply 9. The storage tank 8 is fluidically coupled to the cylinder 2 on the side of the double piston 3 facing the piston rod 4 via a pipe 10 and on the side facing away from the piston rod 4 via a line 11 with an inserted check valve 12.

Wenn der Druck im Arbeitskreislauf steigt, dann steigt er auch in dem Speichertank 8 und beaufschlagt den Doppelkolben 3 auf der Seite mit der Kolbenstange 4. Hierbei wird der Doppelkolben 3 nach oben verlagert und die Kolbenstange 4 liegt nach dem Erreichen eines Soll-Drucks nicht mehr auf der Exzenterscheibe auf. Im vorliegenden Fall beträgt das Verhältnis der beiden Flächen des Doppelkolbens 3 1,6, wobei dieses Verhältnis der Flächen mit und ohne Kolbenstange 4 insbesondere durch den Durchmesser der Kolbenstange 4 zu variieren ist und dem Verhältnis des Soll-Drucks zu dem Ladedruck in dem Arbeitskreislauf entspricht. Bis der Ladedruck im Arbeitskreislauf dem Soll-Druck entspricht, steht die Kolbenstange 4 mit der von dem Motor angetriebenen Exzenterscheibe 5 in Verbindung. Nach dem Erreichen des Soll-Drucks auf der Seite des Doppelkolbens 3 ohne die Kolbenstange 4, also mit dem Erreichen des maximal vorgesehenen Ladedrucks, besteht aufgrund der Druckbeaufschlagung des Doppelkolbens 3 auf der Seite mit der Kolbenstange 4 keine Verbindung zwischen der Kolbenstange 4 und der Exzenterscheibe 5 und demzufolge wird der Druck nicht weiter erhöht, da keine Pumpleistung vorhanden ist. Der Ladedruck auf der Seite des Doppelkolbens 3 mit der Kolbenstange 4 ist zum Erreichen dieser Wirkung im Ausführungsbeispiel 1,6-mal kleiner als der Solldruck.If the pressure in the working circuit rises, it also rises in the storage tank 8 and acts on the double piston 3 on the side with the piston rod 4. Here, the double piston 3 is displaced upwards and the piston rod 4 is no longer located after a desired pressure has been reached on the eccentric disc. In the present case, the ratio of the two areas of the Double piston 3 1.6, wherein this ratio of the areas with and without piston rod 4 is to be varied in particular by the diameter of the piston rod 4 and corresponds to the ratio of the target pressure to the boost pressure in the working circuit. The piston rod 4 is connected to the eccentric disk 5 driven by the motor until the boost pressure in the working circuit corresponds to the target pressure. After the target pressure has been reached on the side of the double piston 3 without the piston rod 4, i.e. when the maximum charge pressure has been reached, there is no connection between the piston rod 4 and the eccentric disk due to the pressurization of the double piston 3 on the side with the piston rod 4 5 and consequently the pressure is not increased further since there is no pump power. To achieve this effect, the boost pressure on the side of the double piston 3 with the piston rod 4 is 1.6 times less than the target pressure in the exemplary embodiment.

Um mit einem Ladedruck auf der Seite des Doppelkolbens 3 mit der Kolbenstange 4 zu arbeiten, der dem Umgebungsdruck entspricht, wird der Doppelkolben 3 in Richtung des Pfeils 13 mit einer Kraft beaufschlagt, in dem beispielsweise eine Zugfeder an der Kolbenstange 4 oder eine Druckfeder auf der Fläche des Doppelkolbens 3 ohne Kolbenstange 4 angeordnet wird.In order to work with a boost pressure on the side of the double piston 3 with the piston rod 4, which corresponds to the ambient pressure, the double piston 3 is subjected to a force in the direction of arrow 13 in which, for example, a tension spring on the piston rod 4 or a compression spring on the Surface of the double piston 3 is arranged without piston rod 4.

BezugszeichenReference numerals

  1. 1. Pumpe1st pump
  2. 2. Zylinder2nd cylinder
  3. 3. Doppelkolben3. Double piston
  4. 4. Kolbenstange4. Piston rod
  5. 5. Exzenterscheibe5. Eccentric disc
  6. 6. Rohrleitung6. Pipeline
  7. 7. Rückschlagventil7. Check valve
  8. 8. Speichertank8. Storage tank
  9. 9. Vorrat9. Stock
  10. 10. Rohr10. Pipe
  11. 11. Leitung11. Management
  12. 12. RückschlagventilCheck valve
  13. 13. Pfeil13th arrow

Claims (2)

  1. Conveying device for a fluid having a motor coupled to a pump (1), the pump (1) comprising a double piston (3) which is slidably mounted in a cylinder (2) and has a single-ended piston rod (4) which is non-positively connected to the motor, the cylinder (2) being coupled to a supply (9) on the boost side closer to the piston rod (4) and being coupled to a working circuit via a check valve (7) on the working side further away from the piston rod (4), the cylinder (2) being connected to the supply (9) on the working side via a check valve (12), characterized in that
    - the piston rod (4) is non-positively connected to the motor in a detachable manner such that there is a connection only when the boost pressure on the working side of the double piston (3) is less than a target pressure, the ratio of the two surfaces of the double piston (3) with and without the piston rod (4) corresponding to the ratio of the target pressure to the boost pressure in the working circuit.
  2. Conveying device according to claim 1, characterized in that the valves are designed as check valves (7, 12) and are arranged such that the first check valve (7) inserted into the working circuit is closed in the event of a pressure increase in the cylinder (2) on the side of the double piston (3) that is further away from the piston rod (4) and the second check valve (12) inserted into a line (11) leading to the supply (9) is open in the event of a pressure increase in the cylinder (2) on the side of the double piston (3) that is further away from the piston rod (4).
EP14833336.2A 2013-12-21 2014-12-20 Conveying device for a fluid Active EP3084212B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013114749.6A DE102013114749A1 (en) 2013-12-21 2013-12-21 Conveying device for a fluid
PCT/DE2014/100461 WO2015090288A2 (en) 2013-12-21 2014-12-20 Conveying device for a fluid

Publications (2)

Publication Number Publication Date
EP3084212A2 EP3084212A2 (en) 2016-10-26
EP3084212B1 true EP3084212B1 (en) 2020-06-10

Family

ID=52440496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14833336.2A Active EP3084212B1 (en) 2013-12-21 2014-12-20 Conveying device for a fluid

Country Status (3)

Country Link
EP (1) EP3084212B1 (en)
DE (1) DE102013114749A1 (en)
WO (1) WO2015090288A2 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008045730A1 (en) * 2007-09-07 2009-03-19 GM Global Technology Operations, Inc., Detroit Fuel injection pump with low return pulsation

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4017068A1 (en) * 1989-05-31 1990-12-06 Karl Eickmann HIGH PRESSURE AGGREGATE
DE4041807A1 (en) * 1990-12-27 1992-07-02 Karl Eickmann High pressure hydraulic pump e.g. for water milling - has single valve plate with diaphragm-limiting surfaces at each end
WO2008077408A1 (en) * 2006-12-22 2008-07-03 Grundfos Nonox A/S Pump for feeding urea to an engine exhaust system
DE102007062031A1 (en) * 2007-12-21 2009-06-25 Robert Bosch Gmbh Hydraulic fluid pump of a vehicle brake system with an eccentric drive

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008045730A1 (en) * 2007-09-07 2009-03-19 GM Global Technology Operations, Inc., Detroit Fuel injection pump with low return pulsation

Also Published As

Publication number Publication date
WO2015090288A2 (en) 2015-06-25
DE102013114749A1 (en) 2015-06-25
WO2015090288A3 (en) 2015-09-03
EP3084212A2 (en) 2016-10-26

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