EP3592988B1 - Switched suction jet pump - Google Patents

Switched suction jet pump Download PDF

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Publication number
EP3592988B1
EP3592988B1 EP18712808.7A EP18712808A EP3592988B1 EP 3592988 B1 EP3592988 B1 EP 3592988B1 EP 18712808 A EP18712808 A EP 18712808A EP 3592988 B1 EP3592988 B1 EP 3592988B1
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EP
European Patent Office
Prior art keywords
jet pump
valve body
suction jet
suction
nozzle
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EP18712808.7A
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German (de)
French (fr)
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EP3592988A1 (en
Inventor
Christian Berding
Christoph LESON
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Polytec Plastics Germany GmbH and Co KG
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Polytec Plastics Germany GmbH and Co KG
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Publication of EP3592988A1 publication Critical patent/EP3592988A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/461—Adjustable nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
    • F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
    • F04F5/20—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids for evacuating
    • F04F5/22—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids for evacuating of multi-stage type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/02—Crankcase ventilating or breathing by means of additional source of positive or negative pressure
    • F01M13/021—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure
    • F01M13/022—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure using engine inlet suction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/02—Crankcase ventilating or breathing by means of additional source of positive or negative pressure
    • F01M13/021—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure
    • F01M2013/026—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure with pumps sucking air or blow-by gases from the crankcase
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/466—Arrangements of nozzles with a plurality of nozzles arranged in parallel

Definitions

  • the subject matter of the invention is a switched single-stage or multi-stage suction jet pump comprising a motive nozzle, one or more suction nozzles, a diffuser and a volume flow limiting valve.
  • the suction power of a conventional suction jet pump is regulated by the pressure applied to the propulsion jet nozzle.
  • this motive pressure is branched off from the boost pressure of the engine and depends on the respective engine load point. The higher the torque generated, the greater the boost pressure.
  • a suction jet pump is used to generate negative pressure in the crankcase or to ventilate the tank, sufficient suction power is required even at low boost pressures.
  • the suction power of the ejector pump does not have to increase in parallel with the increasing boost pressure. For this reason, it makes sense that the suction jet pump is throttled above a certain boost pressure. This is to prevent the internal combustion engine from diverting an unnecessarily large amount of air for combustion and reducing the power.
  • EP 3 020 935 A2 relates to a vehicle with an internal combustion engine, which has a crankcase and a charging device, with a crankcase ventilation device, which has an inertia-based oil separation device with at least one inertia-based Oil separator, a separated oil to the crankcase returning oil return and a suction jet pump which is driven with compressed air of the charging device and which generates a negative pressure to drive blow-by gas.
  • the suction jet pump is regulated and / or controlled by a control device.
  • the pump is throttled or switched off in the area of low boost pressure. In the high pressure range it is switched on to the maximum.
  • the motive flow of the ejector pump is only throttled at higher boost pressures.
  • the setting of the drive flow is self-regulating via the boost pressure DE 10 2015 208 906 A1 discloses a further suction jet pump which has an elastic valve body in the motive nozzle for self-regulation of the motive flow.
  • the disadvantage of the known solutions is that not the maximum available at the first nozzle of the suction jet pump Pressure is applied because the throttling takes place in front of the nozzle. Part of the energy used is always consumed at the throttle valve and is to be regarded as pure energy loss. Furthermore, the known systems are very large.
  • the object of the invention is now to integrate the throttle function directly into the motive nozzle of the suction jet pump.
  • the present invention therefore consists of a single-stage or multi-stage ejector pump comprising a motive nozzle 5, one or more suction nozzles in the suction area 2 and a diffuser 7, which is characterized in that the ejector pump in or immediately in front of the motive nozzle 5 is a device for Has reduction of the nozzle cross-section and thus to limit the propellant flow.
  • the invention consists of a single-stage or multi-stage ejector pump as in the Figs. 1 and 2 shown with a driving nozzle 5, a diffuser 7 and optionally further nozzles 6.
  • the overpressure area (1) which can be, for example, the boost pressure of a turbo engine.
  • the propellant fluid is accelerated through the propellant nozzle 5, so that the maximum speed is present after the nozzle.
  • This increases the dynamic pressure in this area.
  • the static pressure drops.
  • air is sucked in from the suction area 2 and then flows with the propellant air through the diffuser 7, where the flow is decelerated.
  • This can be used, for example, to generate a negative pressure in a crankcase or in a tank.
  • the total flow 3 can then be fed back to the intake air of the internal combustion engine (for example upstream of the compressor).
  • the device for limiting the driving flow has a valve body 4 in the overpressure area of the ejector pump, which in particular comprises an opening 8, the cross-sectional area of which is smaller than the cross-sectional area of the driving nozzle 5.
  • the drive flow limitation according to the invention is preferably achieved by a (spring-loaded) valve body 4 which is mounted directly in front of the drive nozzle 5 of the suction jet pump.
  • the suspension is preferably implemented in the valve body 4 by means of spring arms.
  • the valve body 4 lies, for example, on a support surface 11 in the body of the driving nozzle 5.
  • a compression or tension spring can also be used.
  • the spring element can continue to be pretensioned. This can be achieved, for example, by a hold-down device 10.
  • Fig. 1 it is shown that in the original state the valve body 4 is at a distance from the driving nozzle 5, so that a gap 9 is created between the valve body 4 and the body of the driving nozzle 5.
  • the driving fluid flows through the valve body 4 in this state via the gap 9.
  • the fluid can optionally flow through the opening in the valve body 4.
  • the motive current increases ( Fig. 2 ).
  • the motive flow and the Venturi effect result in the formation of the total flow 3.
  • the present invention provides a mass flow control with a defined valve characteristic map with a small installation space.
  • the valve body 4 in particular a spring plate, the flow cross section of the gap 9 between the Reduced overpressure area 1 and the underpressure area and thus regulates the propellant mass flow.
  • Another advantage of the present invention is that there is only one movable component, namely the valve body 4, in particular a spring plate.
  • the valve body 4 is used to regulate the cross section through which the flow passes, preferably in the form of a spring plate.
  • the spring plate can, for example, be installed under a defined pretension in the area of the overpressure 1 in order to clear the path of the gas flow through the gap 9. If the pressure gradient increases due to a stronger propulsion jet pressure, the valve body 4 moves towards the wall of the propulsion nozzle 5 up to the point that the gap 9 is completely closed.
  • the valve body 4 generates a pressure loss depending on the motive flow. If this pressure loss exceeds the spring force of the valve body, it moves in the direction of the motive nozzle 5 and slowly closes the gap 9. As the motive pressure increases, the motive flow decreases. The same applies to the suction flow in the suction area 2. At the end of the closing process, the valve body 4 seals approximately on the body of the drive nozzle 5, so that the drive fluid can only flow into the suction jet pump via the opening of the drive nozzle 5, as in FIG Fig. 2 shown. The drive flow is limited by the smaller opening in the valve body 4. However, due to the increase in density of the fluid at higher motive pressures, there is a further, but flat, increase in the motive flow. The suction flow also continues to increase.
  • the valve body 4 is preferably to be designed in such a way that the pressure loss is low, so that as far as possible the entire driving pressure can be used to drive the ejector pump.
  • Another embodiment of the present invention consists in the use of the above-defined device for crankcase ventilation of an internal combustion engine in a housing between a crankcase of a crankcase and an intake tract or the tank ventilation.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Supercharger (AREA)

Description

Gegenstand der Erfindung ist eine geschaltete einstufige oder mehrstufige Saugstrahlpumpe umfassend eine Treibdüse, eine oder mehrere Ansaugdüsen, einen Diffusor und ein Volumenstrombegrenzungsventil.The subject matter of the invention is a switched single-stage or multi-stage suction jet pump comprising a motive nozzle, one or more suction nozzles, a diffuser and a volume flow limiting valve.

Die Saugleistung einer üblichen Saugstrahlpumpe wird über den anliegenden Druck an der Treibstrahldüse geregelt. Bei einer Brennkraftmaschine mit Turboaufladung wird dieser Treibdruck vom Ladedruck des Motors abgezweigt und hängt von dem jeweiligen Motorlastpunkt ab. Je höher das erzeugte Drehmoment, desto größer ist der Ladedruck. Wird eine Saugstrahlpumpe zur Erzeugung von Unterdruck im Kurbelgehäuse oder zur Tankentlüftung eingesetzt, so wird bereits bei geringen Ladedrücken eine ausreichende Saugleistung benötigt. Die Saugleistung der Saugstrahlpumpe muss in der Regel aber nicht parallel zum steigenden Ladedruck zunehmen. Aus diesem Grund ist es sinnvoll, dass die Saugstrahlpumpe ab einem gewissen Ladedruck gedrosselt wird. Dadurch soll verhindert werden, dass der Brennkraftmaschine unnötig viel Luft für die Verbrennung abgezweigt und die Leistung reduziert wird.The suction power of a conventional suction jet pump is regulated by the pressure applied to the propulsion jet nozzle. In the case of an internal combustion engine with turbocharging, this motive pressure is branched off from the boost pressure of the engine and depends on the respective engine load point. The higher the torque generated, the greater the boost pressure. If a suction jet pump is used to generate negative pressure in the crankcase or to ventilate the tank, sufficient suction power is required even at low boost pressures. As a rule, however, the suction power of the ejector pump does not have to increase in parallel with the increasing boost pressure. For this reason, it makes sense that the suction jet pump is throttled above a certain boost pressure. This is to prevent the internal combustion engine from diverting an unnecessarily large amount of air for combustion and reducing the power.

EP 3 020 935 A2 betrifft ein Fahrzeug mit einer Brennkraftmaschine, die ein Kurbelgehäuse und eine Aufladeeinrichtung aufweist, mit einer Kurbelgehäuseentlüftungseinrichtung, die eine trägheitsbasierte Ölabscheideeinrichtung mit mindestens einem trägheitsbasierten Ölabscheider, einen abgeschiedenes Öl zum Kurbelgehäuse rückführenden Ölrücklauf und eine Saugstrahlpumpe aufweist, die mit komprimierter Luft der Aufladeeinrichtung angetrieben wird und die einen Unterdruck erzeugt, um Blow-By-Gas anzutreiben. Wesentlich ist hier, dass die Saugstrahlpumpe von einer Steuereinrichtung geregelt und/oder gesteuert wird. Hier wird im Bereich geringen Ladedrucks die Pumpe gedrosselt oder abgeschaltet. Im Bereich hohen Drucks wird sie maximal zugeschaltet. EP 3 020 935 A2 relates to a vehicle with an internal combustion engine, which has a crankcase and a charging device, with a crankcase ventilation device, which has an inertia-based oil separation device with at least one inertia-based Oil separator, a separated oil to the crankcase returning oil return and a suction jet pump which is driven with compressed air of the charging device and which generates a negative pressure to drive blow-by gas. It is essential here that the suction jet pump is regulated and / or controlled by a control device. Here, the pump is throttled or switched off in the area of low boost pressure. In the high pressure range it is switched on to the maximum.

In EP 3 020 935 A2 wird argumentiert, dass man bei geringen Ladedrücken der Brennkraftmaschine keine Luft entziehen sollte, um das Ansprechverhalten der Brennkraftmaschine im Teillast- und Leerlauf-Betrieb nicht negativ zu beeinflussen und somit die Leistung nicht zu schmälern. Bei höheren Drücken ist das Abzweigen von Ladeluft nicht mehr so kritisch, da der Brennkraftmaschine ausreichend große Mengen an komprimierter Luft bereitgestellt werden und es keine nennenswerten Einbußen der Motorleistung gibt. In DE 10 2013 000236 A1 hingegen wird dargelegt, dass bereits bei geringen Ladedrücken ein ausreichender Unterdruck benötigt wird, welcher später jedoch nicht so schnell ansteigen muss wie der Ladedruck. Das bedeutet, dass die Saugstrahlpumpe bereits bei geringen Ladedrücken eine hohe Saugleistung aufweisen muss; bei höheren Ladedrücken kann diese jedoch reduziert werden. Aus diesem Grund wird hier eine Drosselung des Treibstroms der Saugstrahlpumpe erst bei höheren Ladedrücken vorgenommen. Die Einstellung des Treibstroms erfolgt in diesem Fall selbstregelnd über den Ladedruck DE 10 2015 208 906 A1 offenbart eine weitere Saugstrahlpumpe, die einen elastischen Ventilkörper in der Treibdüse zur Selbstregelung des Treibstroms aufweist.In EP 3 020 935 A2 It is argued that no air should be withdrawn from the internal combustion engine at low boost pressures in order not to negatively influence the response behavior of the internal combustion engine in partial load and idle operation and thus not to reduce the performance. At higher pressures, the diversion of charge air is no longer so critical, since the internal combustion engine is provided with sufficiently large quantities of compressed air and there are no significant losses in engine performance. In DE 10 2013 000236 A1 on the other hand, it is shown that a sufficient negative pressure is required even at low boost pressures, which, however, does not have to rise as quickly as the boost pressure later on. This means that the suction jet pump must have a high suction power even at low boost pressures; however, this can be reduced at higher boost pressures. For this reason, the motive flow of the ejector pump is only throttled at higher boost pressures. In this case, the setting of the drive flow is self-regulating via the boost pressure DE 10 2015 208 906 A1 discloses a further suction jet pump which has an elastic valve body in the motive nozzle for self-regulation of the motive flow.

Der Nachteil der bekannten Lösungen besteht darin, dass an der ersten Düse der Saugstrahlpumpe nicht der maximal zur Verfügung stehende Druck anliegt, da die Drosselung vor der Düse stattfindet. Ein Teil der eingesetzten Energie wird immer schon an dem Drosselventil verbraucht und ist als reine Verlustenergie zu betrachten. Des Weiteren bauen die bekannten Systeme sehr groß auf.The disadvantage of the known solutions is that not the maximum available at the first nozzle of the suction jet pump Pressure is applied because the throttling takes place in front of the nozzle. Part of the energy used is always consumed at the throttle valve and is to be regarded as pure energy loss. Furthermore, the known systems are very large.

Die Aufgabe der Erfindung besteht nunmehr in der Integration der Drosselfunktion direkt in die Treibdüse der Saugstrahlpumpe.The object of the invention is now to integrate the throttle function directly into the motive nozzle of the suction jet pump.

In einer ersten Ausführungsform besteht daher die vorliegende Erfindung aus einer einstufigen oder mehrstufigen Saugstrahlpumpe umfassend eine Treibdüse 5, eine oder mehrere Ansaugdüsen im Ansaugbereich 2 und einen Diffusor 7, die dadurch gekennzeichnet ist, dass die Saugstrahlpumpe in oder unmittelbar vor der Treibdüse 5 eine Vorrichtung zur Reduzierung des Düsenquerschnitts und somit zur Begrenzung des Treibstroms aufweist.In a first embodiment, the present invention therefore consists of a single-stage or multi-stage ejector pump comprising a motive nozzle 5, one or more suction nozzles in the suction area 2 and a diffuser 7, which is characterized in that the ejector pump in or immediately in front of the motive nozzle 5 is a device for Has reduction of the nozzle cross-section and thus to limit the propellant flow.

Dadurch soll nicht der Druck zum Antreiben der Saugstrahlpumpe wie in DE 10 2013 000236 A1 gedrosselt werden, sondern die Treibdüse direkt in ihrem Düsenquerschnitt reduziert werden. Dies hat den Vorteil, dass weiterhin der vollständige Ladedruck an der Treibdüse anliegt und zur Erzeugung des Saugstroms verwendet werden kann. Trotzdem liegt eine Drosselung des Treibmassestroms vor. Weiterhin kann das System durch die direkte Integration sehr kompakt aufgebaut werden.

  • Fig. 1 zeigt die Erfindung mit einem selbstfedernden Ventilkörper in ungedrosselter Schaltstellung.
  • Fig. 2 zeigt die Erfindung mit einem selbstfedernden Ventilkörper in gedrosselter Schaltstellung.
  • Fig. 3 zeigt einen möglichen Kurvenverlauf des Treib- und Saugstroms in Abhängigkeit des anliegenden Treibdrucks.
As a result, the pressure for driving the suction jet pump should not be increased as in DE 10 2013 000236 A1 are throttled, but the motive nozzle can be reduced directly in its nozzle cross-section. This has the advantage that the full boost pressure is still applied to the propellant nozzle and can be used to generate the suction flow. Nevertheless, there is a throttling of the motive mass flow. Furthermore, the system can be built very compactly through the direct integration.
  • Fig. 1 shows the invention with a self-resilient valve body in an unthrottled switching position.
  • Fig. 2 shows the invention with a self-resilient valve body in a throttled switching position.
  • Fig. 3 shows a possible curve of the motive and suction flow as a function of the applied motive pressure.

Insbesondere besteht die Erfindung aus einer einstufigen oder mehrstufigen Saugstrahlpumpe wie in den Fig. 1 und 2 dargestellt mit einer Treibdüse 5, einem Diffusor 7 und optional weiteren Düsen 6. Vor der Treibdüse 5 befindet sich der Überdruckbereich (1), welcher beispielsweise der Ladedruck eines Turbomotors sein kann. Durch den Überdruck wird das Treibfluid durch die Treibdüse 5 beschleunigt, so dass nach der Düse die maximale Geschwindigkeit vorliegt. Dadurch steigt der dynamische Druck in diesem Bereich an. Aus Gründen der Energieerhaltung fällt der statische Druck ab. Dadurch wird Luft aus dem Ansaugbereich 2 angesaugt und strömt dann mit der Treibluft durch den Diffusor 7, wo die Strömung entschleunigt wird. Dies kann beispielweise dazu genutzt werden einen Unterdruck in einem Kurbelgehäuse oder in einem Tank zu erzeugen. Der Gesamtstrom 3 kann dann wieder der Ansaugluft der Brennkraftmaschine zugeführt werden (beispielsweise vor den Verdichter).In particular, the invention consists of a single-stage or multi-stage ejector pump as in the Figs. 1 and 2 shown with a driving nozzle 5, a diffuser 7 and optionally further nozzles 6. In front of the driving nozzle 5 there is the overpressure area (1), which can be, for example, the boost pressure of a turbo engine. As a result of the overpressure, the propellant fluid is accelerated through the propellant nozzle 5, so that the maximum speed is present after the nozzle. This increases the dynamic pressure in this area. For reasons of energy conservation, the static pressure drops. As a result, air is sucked in from the suction area 2 and then flows with the propellant air through the diffuser 7, where the flow is decelerated. This can be used, for example, to generate a negative pressure in a crankcase or in a tank. The total flow 3 can then be fed back to the intake air of the internal combustion engine (for example upstream of the compressor).

Erfindungsgemäß ist besonders bevorzugt, dass die Vorrichtung zur Begrenzung des Treibstroms (Volumenstrombegrenzungsventil) im Überdruckbereich der Saugstrahlpumpe einen Ventilkörper 4 aufweist, der insbesondere eine Öffnung 8 umfasst, deren Querschnittsfläche kleiner ist, als die Querschnittsfläche der Treibdüse 5.According to the invention, it is particularly preferred that the device for limiting the driving flow (volume flow limitation valve) has a valve body 4 in the overpressure area of the ejector pump, which in particular comprises an opening 8, the cross-sectional area of which is smaller than the cross-sectional area of the driving nozzle 5.

Durch die Positionierung der Begrenzungsfunktion vor oder in der Treibdüse 5 kann fast der komplette zur Verfügung stehende Treibdruck zum Antrieb der Saugstrahlpumpe verwendet werden. Weiterhin ist der Aufbau des Systems sehr kompakt. Auch wird die Anzahl der Bauteile reduziert.By positioning the limiting function in front of or in the motive nozzle 5, almost all of the motive pressure available can be used to drive the suction jet pump. Furthermore, the Structure of the system very compact. The number of components is also reduced.

Die erfindungsgemäße Treibstrombegrenzung wird vorzugsweise durch einen (gefederten) Ventilkörper 4 gelöst, welcher unmittelbar vor die Treibdüse 5 der Saugstrahlpumpe montiert wird.The drive flow limitation according to the invention is preferably achieved by a (spring-loaded) valve body 4 which is mounted directly in front of the drive nozzle 5 of the suction jet pump.

Die Federung wird vorzugsweise in den Ventilkörper 4 durch Federarme realisiert. In diesem Fall liegt der Ventilkörper 4 beispielsweise auf einer Auflagefläche 11 im Körper der Treibdüse 5. Alternativ kann aber auch eine Druck- oder Zugfeder verwendet werden. Zur Einstellung des Schaltpunktes des Ventilkörpers 4 kann das Federelement weiterhin vorgespannt werden. Dies kann beispielsweise durch einen Niederhalter 10 realisiert werden.The suspension is preferably implemented in the valve body 4 by means of spring arms. In this case, the valve body 4 lies, for example, on a support surface 11 in the body of the driving nozzle 5. Alternatively, a compression or tension spring can also be used. To set the switching point of the valve body 4, the spring element can continue to be pretensioned. This can be achieved, for example, by a hold-down device 10.

In Fig. 1 ist dargestellt, dass im Ursprungszustand der Ventilkörper 4 einen Abstand zur Treibdüse 5 aufweist, so dass ein Spalt 9 zwischen dem Ventilkörper 4 und dem Körper der Treibdüse 5 entsteht. Das Treibfluid durchströmt den Ventilkörper 4 in diesem Zustand über den Spalt 9. Weiterhin kann das Fluid gegebenenfalls durch die Öffnung im Ventilkörper 4 strömen. Bei steigendem Treibdruck steigt der Treibstrom an (Fig. 2). Durch den Treibstrom und den Venturi-Effekt kommt es zur der Bildung des Gesamtstroms 3.In Fig. 1 it is shown that in the original state the valve body 4 is at a distance from the driving nozzle 5, so that a gap 9 is created between the valve body 4 and the body of the driving nozzle 5. The driving fluid flows through the valve body 4 in this state via the gap 9. Furthermore, the fluid can optionally flow through the opening in the valve body 4. With increasing motive pressure, the motive current increases ( Fig. 2 ). The motive flow and the Venturi effect result in the formation of the total flow 3.

Durch die vorliegende Erfindung wird eine Massestromregelung mit definiertem Ventilkennfeld bei geringem Bauraum zur Verfügung gestellt. Mit dem Ventilkörper 4, insbesondere einem Federblech wird der durchströmte Querschnitt des Spalts 9 zwischen dem Überdruckbereich 1 und dem Unterdruckbereich reduziert und damit der Treibmassestrom geregelt.The present invention provides a mass flow control with a defined valve characteristic map with a small installation space. With the valve body 4, in particular a spring plate, the flow cross section of the gap 9 between the Reduced overpressure area 1 and the underpressure area and thus regulates the propellant mass flow.

Ein weiterer Vorteil der vorliegenden Erfindung besteht darin, dass nur ein bewegliches Bauteil, nämlich der Ventilkörper 4, insbesondere ein Federblech vorliegt.Another advantage of the present invention is that there is only one movable component, namely the valve body 4, in particular a spring plate.

Der Ventilkörper 4 dient der Regelung des durchströmten Querschnittes vorzugsweise in Form eines Federblechs. Das Federblech kann beispielsweise im Bereich des Überdrucks 1 unter einer definierten Vorspannung verbaut sein, um den Weg der Gasströmung durch den Spalt 9 freizugeben. Steigt das Druckgefälle durch einen stärkeren Treibstrahldruck, so bewegt sich der Ventilkörper 4 auf die Wand der Treibdüse 5 zu bis hin zu dem Punkt, dass der Spalt 9 vollständig verschlossen ist.The valve body 4 is used to regulate the cross section through which the flow passes, preferably in the form of a spring plate. The spring plate can, for example, be installed under a defined pretension in the area of the overpressure 1 in order to clear the path of the gas flow through the gap 9. If the pressure gradient increases due to a stronger propulsion jet pressure, the valve body 4 moves towards the wall of the propulsion nozzle 5 up to the point that the gap 9 is completely closed.

Der Ventilkörper 4 erzeugt je nach Treibstrom einen Druckverlust. Übersteigt dieser Druckverlust die Federkraft des Ventilkörpers, so bewegt sich dieser in Richtung Treibdüse 5 und schließt langsam den Spalt 9. Bei steigendem Treibdruck nimmt der Treibstrom ab. Das gleiche gilt für den Saugstrom im Ansaugbereich 2. Am Ende des Schließvorgangs dichtet der Ventilkörper 4 auf dem Körper der Treibdüse 5 annähernd ab, so dass das Treibfluid nur noch über die Öffnung der Treibdüse 5 in die Saugstrahlpumpe einströmen kann, wie in Fig. 2 dargestellt. Durch die kleinere Öffnung in dem Ventilkörper 4 wird der Treibstrom begrenzt. Es kommt allerdings aufgrund der Dichtezunahme des Fluids bei höheren Treibdrücken zu einem weiteren jedoch flachen Anstieg des Treibstroms. Der Saugstrom steigt ebenfalls weiter an.The valve body 4 generates a pressure loss depending on the motive flow. If this pressure loss exceeds the spring force of the valve body, it moves in the direction of the motive nozzle 5 and slowly closes the gap 9. As the motive pressure increases, the motive flow decreases. The same applies to the suction flow in the suction area 2. At the end of the closing process, the valve body 4 seals approximately on the body of the drive nozzle 5, so that the drive fluid can only flow into the suction jet pump via the opening of the drive nozzle 5, as in FIG Fig. 2 shown. The drive flow is limited by the smaller opening in the valve body 4. However, due to the increase in density of the fluid at higher motive pressures, there is a further, but flat, increase in the motive flow. The suction flow also continues to increase.

Der Ventilkörper 4 ist vorzugsweise so zu gestalten, dass der Druckverlust gering ist, damit möglichst der komplette Treibdruck zum Antrieb der Saugstrahlpumpe genutzt werden kann.The valve body 4 is preferably to be designed in such a way that the pressure loss is low, so that as far as possible the entire driving pressure can be used to drive the ejector pump.

Eine weitere Ausführungsform der vorliegenden Erfindung besteht in der Verwendung der oben definierten Vorrichtung zur Kurbelgehäuseentlüftung einer Brennkraftmaschine in einem Gehäuse zwischen einem Kurbelraum eines Kurbelgehäuses und einem Ansaugtrakt oder der Tankentlüftung.Another embodiment of the present invention consists in the use of the above-defined device for crankcase ventilation of an internal combustion engine in a housing between a crankcase of a crankcase and an intake tract or the tank ventilation.

BezuaszeichenlisteReference list

11
Überdruckbereich (zum Beispiel Ladedruck)Overpressure range (e.g. boost pressure)
22
Ansaugbereich (zum Beispiel KG oder Tankentlüftung)Intake area (e.g. KG or tank ventilation)
33
Gesamtstrom (zum Beispiel vor Verdichter)Total current (for example upstream of the compressor)
44th
VentilkörperValve body
55
TreibdüsePropulsion nozzle
66th
Zweite Düse (optional)Second nozzle (optional)
77th
DiffusorDiffuser
88th
Öffnung VentilkörperOpening valve body
99
Spalt unter VentilkörperGap under valve body
1010
Niederhalter / VorspannerHold-down device / pretensioner
1111
Auflage Ventilkörper (Blechvariante)Valve body support (sheet metal version)

Claims (4)

  1. A single-stage or multistage suction jet pump, comprising a jet nozzle (5), one or more suction nozzles in the intake zone (2), and a diffuser (7), characterized in that said suction jet pump has a valve body (4) in or directly upstream from the jet nozzle (5) in the overpressure zone of the suction jet pump, said valve body spanning at least one gap (9), wherein said suction jet pump, when the pressure difference between the overpressure zone (1) and the intake zone (2) increases, at first opens the cross-section of the gap (9), but switches at a defined high pressure drop, and the valve body (4) reduces the cross-section of or closes the gap (9) in such a way that the volume flow through the opening (8) is limited to a defined level even when the pressure difference increases further.
  2. The suction jet pump according to claim 1, characterized in that said valve body comprises an opening (8) whose cross-sectional area is smaller than the cross-sectional area of the jet nozzle (5).
  3. The suction jet pump according to claim 1 or 2, characterized in that said valve body (4) is designed as a spring sheet, which is especially attached under a bias by a downholder (10) an the inlet of the suction jet pump.
  4. Use of a suction jet pump according to any of claims 1 to 3 for ventilating crankcases of an internal combustion engine, especially of a motor vehicle, or for tank ventilation.
EP18712808.7A 2017-03-09 2018-03-07 Switched suction jet pump Active EP3592988B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017203877.2A DE102017203877A1 (en) 2017-03-09 2017-03-09 Switched suction jet pump
PCT/EP2018/055584 WO2018162542A1 (en) 2017-03-09 2018-03-07 Switched suction jet pump

Publications (2)

Publication Number Publication Date
EP3592988A1 EP3592988A1 (en) 2020-01-15
EP3592988B1 true EP3592988B1 (en) 2021-05-05

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Application Number Title Priority Date Filing Date
EP18712808.7A Active EP3592988B1 (en) 2017-03-09 2018-03-07 Switched suction jet pump

Country Status (5)

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US (1) US11022149B2 (en)
EP (1) EP3592988B1 (en)
CN (1) CN110352302B (en)
DE (1) DE102017203877A1 (en)
WO (1) WO2018162542A1 (en)

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DE102020118330A1 (en) 2020-07-10 2022-01-13 Norma Germany Gmbh Nozzle device for a jet pump and jet pump

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Also Published As

Publication number Publication date
CN110352302B (en) 2021-02-02
DE102017203877A1 (en) 2018-09-13
EP3592988A1 (en) 2020-01-15
US11022149B2 (en) 2021-06-01
CN110352302A (en) 2019-10-18
WO2018162542A1 (en) 2018-09-13
US20210131451A1 (en) 2021-05-06

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