WO2013045040A1 - Pompe à jet de gaz conçue pour refouler un flux gazeux principal - Google Patents

Pompe à jet de gaz conçue pour refouler un flux gazeux principal Download PDF

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Publication number
WO2013045040A1
WO2013045040A1 PCT/EP2012/003909 EP2012003909W WO2013045040A1 WO 2013045040 A1 WO2013045040 A1 WO 2013045040A1 EP 2012003909 W EP2012003909 W EP 2012003909W WO 2013045040 A1 WO2013045040 A1 WO 2013045040A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
nozzle
jet pump
gas stream
gas jet
Prior art date
Application number
PCT/EP2012/003909
Other languages
German (de)
English (en)
Inventor
Matthias Jesse
Thomas Winkeler
Original Assignee
Daimler Ag
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 Daimler Ag filed Critical Daimler Ag
Publication of WO2013045040A1 publication Critical patent/WO2013045040A1/fr

Links

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
    • 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
    • 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
    • F04F5/463—Arrangements of nozzles with provisions for mixing
    • 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 invention relates to a gas jet pump for promoting a main gas stream according to the closer defined in the preamble of claim 1.
  • the invention also relates to the use of such a gas jet pump.
  • Gas jet pumps are known from the general state of the art. They are often referred to as pulse exchange machines, ejectors or, based on the English term, as a jet pump. They always serve to promote a main gas stream by acceleration and / or pressure build-up in the main gas stream is achieved via a propellant gas flow. The two gas streams then arrive mixed in the area in which they are to be promoted.
  • Impulse exchange machine for a gas supply system described. It consists of a gas supply for the main gas flow, which is referred to here as the main gas, and at least one nozzle for the propellant gas stream, which is referred to here as Rajgasdüse.
  • the gas supply and the nozzle open into a common acceleration space, from which the gases mixed out flow through a discharge area again.
  • the nozzles are arranged in the prior art shown here so that they in particular evenly around the gas supply of the
  • Main gas stream are arranged distributed and are injected with at least one direction component in the flow direction of the main gas stream. This results in a momentum exchange between the particles of the supplied via the nozzle
  • Propellant gas stream and the main gas stream whereby the main gas stream is accelerated.
  • the gas streams then go together after the acceleration space in a discharge area.
  • the inventors have shown that the structure described in the generic state of the art has a decisive disadvantage. Presumably, this is because the propellant gas flow is parallel to the walls of the gas supply of the
  • the object of the present invention is now to avoid this disadvantage and to provide a highly efficient gas jet pump.
  • the gas jet pump according to the invention is now constructed as a pulse exchange machine so that the at least one nozzle in the axial direction of the outflow area opens into the acceleration chamber. It also opens in a region of the acceleration chamber opposite the outflow region. This is
  • this acceleration space may be formed as an annular space open in the circumferential direction, which on all sides of the
  • Main gas flow is flowing around. This design, with a central injection of the propellant gas stream or streams oriented perpendicular to the main gas stream, achieves the maximum pressure build-up or the maximum acceleration of the main gas stream, since negative influences on the propellant gas stream, such as friction with the
  • the at least one nozzle has at least two nozzle openings.
  • the use of several nozzle openings with a correspondingly small cross-section allows a comparatively high
  • Main gas flow further increased and it can be achieved a further improvement in flow rate.
  • the at least two nozzle openings are individually supplied with the propellant gas stream, wherein in at least one of the supply lines of the propellant gas stream to the individual nozzle openings, a valve device is arranged.
  • Valve means allows the driving of at least one of the nozzle openings separately from the one or the other. In principle, it is possible to do all of this
  • Equip nozzle openings with its own valve device At least all of the nozzle openings may have one such valve device except for one. Then it is possible to adjust the volume flow so that for the idling operation of the metered through the nozzle opening volume flow is sufficient. Depending on the load condition and the required delivery rate, further nozzle openings can then be flown in, so that it is possible to regulate the power of the gas jet pump easily and efficiently.
  • the valve devices which may be formed for example as simple solenoid valves, no moving parts are necessary here. The structure is therefore correspondingly simple and efficient. Since the solenoid valves can be arranged at a distance from the actual nozzle openings, a very compact construction of the gas jet pump itself is also possible.
  • the solenoid valves can be arranged for example in a valve block outside of the gas jet pump, which is connected via corresponding supply lines to the individual nozzle openings.
  • the nozzle openings are surrounded by an annular nozzle cap.
  • an annular nozzle cap in Outside the nozzle around the nozzle openings allows the or the individual propellant gas streams after exiting the nozzle a certain distance, namely the distance that results from the axial extent of the nozzle cap to flow before they come into contact with the main gas stream. This ensures even better momentum exchange. In particular, however, this also ensures that any impurities or undesirable substances which are transported via the main gas stream, for example moisture entrained in the main gas stream, do not reach the area of the nozzle openings and thus can not pollute or clog them.
  • the nozzle cap at least one opening perpendicular to the flow direction of the
  • Propellant gas stream has.
  • Such an opening such as a notch or the like, can also counteract contamination, for example, by in the interior of the nozzle cap collecting water, which is typically unavoidable due to slight backflow in the nozzle cap, can pass through this opening.
  • the gas jet pump according to the invention can be constructed highly compact and allows a very efficient delivery of a main gas stream via a dosed
  • Suitable fuel cell systems in which exhaust gas is to be promoted as a main gas stream via a metered educt for the fuel cell as a propellant gas stream. This is particularly suitable for a cathode or anode recirculation in one
  • the particularly preferred use lies in the use of the gas jet pump according to the invention in the region of an anode recirculation of a fuel cell system.
  • fuel cell systems which are used in vehicles for generating electric drive power, is an energy-efficient and
  • FIG. 1 shows an exemplary fuel cell system in a vehicle.
  • Fig. 2 is a sectional view from above through a gas jet pump according to the invention.
  • a fuel cell system 1 in an indicated vehicle 2 can be seen purely by way of example and in a very highly schematic manner.
  • Fuel cell system 1 essentially has a fuel cell 3, which in turn has an anode compartment 4 and a cathode compartment 5.
  • the fuel cell 3 should be designed as a stack of PEM fuel cells.
  • the cathode compartment 5 of the fuel cell 3 is supplied via an air conveyor 6 with air as an oxygen supplier. The exhaust air from the cathode chamber 5 passes in the illustrated here
  • Embodiment to the environment in principle, a post-processing, for example, an afterburner, a turbine or the like could be arranged. However, this is not of interest for the present invention, so that a representation has been omitted.
  • the anode chamber 4 of the fuel cell 3 is supplied with hydrogen H 2 , which originates from a compressed gas reservoir 7. From the region of the anode chamber 4, exhaust gas A passes from the anode chamber 4 via a recirculation line 10 back into the area of the gas jet pump 9, and is considered to be secondary therefrom by means of a pressure regulating device 8 and a gas jet pump 9 explained in greater detail below Aspirated gas stream and fed back into the anode chamber 4.
  • This principle of an anode recirculation is known from the general state of the art. It serves to the anode chamber 4 with an excess
  • Hydrogen H 2 supply in order to make the best possible use of its active area.
  • the remaining in the exhaust gas from the anode chamber 4 residual hydrogen is then together with inert gases, which through the membranes from the cathode compartment 5 in the
  • Anodenraum 4 are diffused and a small part of the product water, which arises in the anode chamber 4, fed back via the recirculation line 10 and the Anode space 4 mixed with the fresh hydrogen H 2 supplied again. Since in such an anode recirculation over time, inert gases and water accumulate and thereby the hydrogen concentration decreases, it is necessary, for example from time to time, to discharge water and gas from the anode recirculation.
  • a drain valve 11 is indicated in principle in the illustration of FIG.
  • recirculation conveyor for the recirculated exhaust gas from the anode compartment 4.
  • a recirculation conveyor is shown in the here
  • the gas jet pump 9 consists of a nozzle 12, which is fed here via two separate supply lines 13, and ideally in each case separate valve devices 14, hydrogen H 2 from the compressed gas storage 7 as a primary gas stream. Via nozzle openings 15, this hydrogen H 2 passes from the nozzle 12 into an acceleration space 16, which is designed substantially as a cylindrical disk about a central axis 17 of the gas jet pump 9.
  • This design of the gas jet pump 9 designed as a pulse exchange machine thus differs significantly from the structure of a "sucking" gas jet pump, which is a Venturi tube with a cross-sectional constriction and a subsequent
  • Cross-sectional widening uses to build a vacuum and so suck the recirculated exhaust gas.
  • the acceleration space 16 is open at one or more locations around its circumference and communicates with an exhaust stream A from the anode chamber 4 and the recirculation line 10, respectively.
  • the structure may in particular be such that the acceleration space 16 is designed in the form of a cylindrical disk which is open on the circumference. Via a taper 18, the acceleration space 16 then merges into an outflow region 19, which is formed with a constant cross section.
  • the acceleration chamber 16 and the outflow region 19 are formed in alignment with each other about the central axis 17 of the gas jet pump 9. On the side facing away from the discharge area 19 of the acceleration chamber 16 while the nozzle 12 is arranged.
  • This is arranged centrally, so that through the nozzle openings 15th exiting propellant gas flows in the central region, arranged around the axis 17, to flow into the acceleration space 16. Perpendicular to flows through one or more openings in the peripheral region of the acceleration chamber 16, the exhaust stream A from the anode chamber 4 a.
  • the propellant gas streams from the nozzle openings 15 of this main gas stream of the anode exhaust gas A is correspondingly accelerated, as it comes to an exchange of pulses between the main gas stream A and the or the propellant gas streams.
  • the structure thus enables an acceleration of the main gas flow A or a pressure build-up in the main gas flow and can promote the two gas flows mixed via the outflow region 19 back to the anode compartment 4.
  • Exhaust stream A moisture and water droplets can be entered into the acceleration chamber 16. To wetting the nozzle openings 15 and the risk of freezing of the nozzle openings 15 after stopping the
  • the nozzle cap 20 shields an outlet region 21 of the hydrogen H 2 from the main gas stream A. It is formed substantially annular and surrounds the outlet region 21 so that the flowing through the recirculation lines 10 exhaust gas A is deflected from this area. From the exhaust gas A with transported water is thereby kept away from the critical outlet area 21, in which it could clog the nozzle openings 15 and freeze in their area.
  • This task of keeping liquid away from the exit region 21 of the nozzle 12 fulfills the nozzle cap 20 with its annular structure very efficiently and with very simple structural means.
  • a nozzle cap 20 typically causes dead zones of the flow within the nozzle cap 20, which in turn may lead to water accumulation in the region of these dead zones.
  • an opening 22 is arranged at the bottom, which is embodied here as a notch tapering in the direction of the outlet region 21.
  • this opening 21 prevents the formation of dead zones in the flow and, on the other hand, allows the water collecting in the interior of the annular nozzle cap 20 to escape. Since the opening 21, if only one is present, in the direction of gravity in the
  • the water can through the Expire gravity. Further openings 22 around the circumference of the nozzle cap 20 are in principle conceivable and possible, they then serve not only the water drain, but also the reduction of dead zones of the flow.

Abstract

L'invention concerne une pompe à jet de gaz (9) conçue pour refouler un flux gazeux principal (A) par l'intermédiaire d'un flux de gaz propulseur (H2) ajouté en quantité définie, comprenant une amenée de gaz pour le flux de gaz principal (A), au moins une buse (12) pour le flux de gaz propulseur (H2), une zone d'évacuation (19) pour les flux gazeux mélangés, ainsi qu'un espace d'accélération (16) qui est disposé de manière alignée avec une zone d'évacuation (19), sur le même axe (17), et dans lequel débouchent l'amenée de gaz et la ou les buses (12). Cette invention est caractérisée en ce que la ou les buses (12) mène(nt) à l'espace d'accélération (16) dans la direction axiale de la zone d'évacuation (19), en ce que la ou les buses (12) est/sont disposée(s) dans une zone centrale de l'espace d'accélération (16) opposée à la zone d'évacuation (19), et en ce que l'amenée de gaz débouche dans l'espace d'accélération (16) de manière sensiblement perpendiculaire à la direction axiale de la zone d'évacuation (19).
PCT/EP2012/003909 2011-10-01 2012-09-19 Pompe à jet de gaz conçue pour refouler un flux gazeux principal WO2013045040A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110114716 DE102011114716A1 (de) 2011-10-01 2011-10-01 Gasstrahlpumpe zur Förderung eines Hauptgasstroms
DE102011114716.4 2011-10-01

Publications (1)

Publication Number Publication Date
WO2013045040A1 true WO2013045040A1 (fr) 2013-04-04

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PCT/EP2012/003909 WO2013045040A1 (fr) 2011-10-01 2012-09-19 Pompe à jet de gaz conçue pour refouler un flux gazeux principal

Country Status (2)

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DE (1) DE102011114716A1 (fr)
WO (1) WO2013045040A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017053223A (ja) * 2015-09-07 2017-03-16 パナソニックＩｐマネジメント株式会社 エジェクタ及びヒートポンプ装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017205589B4 (de) * 2017-04-03 2019-03-14 Audi Ag Saugstrahlpumpe
CN114352582B (zh) * 2022-01-09 2022-11-22 擎能动力科技(苏州)有限公司 双引射器系统、氢燃料电池双引射器模块系统、设计方法、新能源汽车

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3369735A (en) * 1965-06-19 1968-02-20 Siemens Ag Gas-jet suction device, particularly for connection to a vacuum pump
DE4416014A1 (de) * 1994-05-06 1995-11-09 Giese Horst Dipl Ing Fh Verfahren und Vorrichtung zur Verbesserung der Reinigung des Abgases eines Verbrennungsmotors mit einer Abgasreinigungsanlage, insbesondere in einem Kraftfahrzeug
US20050064255A1 (en) * 2003-09-18 2005-03-24 Ballard Power Systems Inc. Fuel cell system with fluid stream recirculation
WO2008019771A1 (fr) * 2006-08-12 2008-02-21 Daimler Ag Dispositif de recirculation de gaz d'échappement d'anode d'une pile à combustible
DE102008003033A1 (de) 2008-01-02 2009-07-09 Daimler Ag Impulsaustauschmaschine für eine Gasversorgungsanordnung sowie Gasversorgungsanordnung eines Brennstoffzellensystems
US20090223016A1 (en) * 2008-02-26 2009-09-10 Air Water Sol Inc. Gas jet nozzle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3369735A (en) * 1965-06-19 1968-02-20 Siemens Ag Gas-jet suction device, particularly for connection to a vacuum pump
DE4416014A1 (de) * 1994-05-06 1995-11-09 Giese Horst Dipl Ing Fh Verfahren und Vorrichtung zur Verbesserung der Reinigung des Abgases eines Verbrennungsmotors mit einer Abgasreinigungsanlage, insbesondere in einem Kraftfahrzeug
US20050064255A1 (en) * 2003-09-18 2005-03-24 Ballard Power Systems Inc. Fuel cell system with fluid stream recirculation
WO2008019771A1 (fr) * 2006-08-12 2008-02-21 Daimler Ag Dispositif de recirculation de gaz d'échappement d'anode d'une pile à combustible
DE102008003033A1 (de) 2008-01-02 2009-07-09 Daimler Ag Impulsaustauschmaschine für eine Gasversorgungsanordnung sowie Gasversorgungsanordnung eines Brennstoffzellensystems
US20090223016A1 (en) * 2008-02-26 2009-09-10 Air Water Sol Inc. Gas jet nozzle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017053223A (ja) * 2015-09-07 2017-03-16 パナソニックＩｐマネジメント株式会社 エジェクタ及びヒートポンプ装置

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