EP0130433B1 - Machine à ondes de pression comprenant une soupape de sortie pour le gaz d'échappement - Google Patents

Machine à ondes de pression comprenant une soupape de sortie pour le gaz d'échappement Download PDF

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Publication number
EP0130433B1
EP0130433B1 EP84106843A EP84106843A EP0130433B1 EP 0130433 B1 EP0130433 B1 EP 0130433B1 EP 84106843 A EP84106843 A EP 84106843A EP 84106843 A EP84106843 A EP 84106843A EP 0130433 B1 EP0130433 B1 EP 0130433B1
Authority
EP
European Patent Office
Prior art keywords
flap
exhaust gas
pressure wave
gas outlet
lever
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84106843A
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German (de)
English (en)
Other versions
EP0130433A1 (fr
Inventor
Andreas Mayer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BBC Brown Boveri AG Switzerland
Original Assignee
BBC Brown Boveri AG Switzerland
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 BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Priority to AT84106843T priority Critical patent/ATE23912T1/de
Publication of EP0130433A1 publication Critical patent/EP0130433A1/fr
Application granted granted Critical
Publication of EP0130433B1 publication Critical patent/EP0130433B1/fr
Expired legal-status Critical Current

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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
    • F04F13/00—Pressure exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • F02B33/32—Engines with pumps other than of reciprocating-piston type
    • F02B33/42—Engines with pumps other than of reciprocating-piston type with driven apparatus for immediate conversion of combustion gas pressure into pressure of fresh charge, e.g. with cell-type pressure exchangers

Definitions

  • the present invention relates to a pressure wave charger with an exhaust gas relief valve according to the preamble of patent claim 1.
  • a pressure wave supercharger for such engines is designed in such a way that it generates a boost pressure under load at the maximum engine speed that is higher than the boost pressure required to generate the permissible peak pressure without exhaust gas being blown off.
  • a high permissible boost pressure and thus a favorable torque curve and fuel consumption can then be achieved over a wide operating range.
  • Such a motor is elastic and a vehicle equipped with it can be driven lazily.
  • Blowing off exhaust gas does not need to be used in commercial vehicle engines, since these allow higher boost pressures and operate in a narrower speed range than passenger car engines. For commercial vehicle engines, it is therefore sufficient to design the pressure wave charger so that it delivers the maximum boost pressure in the desired operating range at which the peak value of the combustion pressure is still permissible.
  • a regulating device for regulating the boost pressure by deliberately blowing off the engine exhaust gas upstream of the pressure wave charger is the subject of an earlier patent application, see EP-A-0 123 990.
  • the valve member used in the device described therein, with which the blow-off channel, referred to in specialist circles as wastegate, more or less is released or closed, is a spring-loaded poppet valve.
  • the valve member is likewise spring-loaded and mushroom-shaped in the area of the sealing elements.
  • the location and the design of the opening of the blow-off channel in the exhaust outlet connection are selected so that the blow-off flow exerts an ejector effect in the latter and thereby supports the purging of the relaxed exhaust gases from the cells of the rotor.
  • an exhaust gas blow-off valve which redirects the transfer of excess high-pressure exhaust gas before it enters the exhaust gas outlet connection and thus prevents impermissibly high charging pressures.
  • a flap in the overflow channel is controlled by a membrane which is acted upon by high pressure exhaust gas on the one hand and a constant pressure on the other hand.
  • the constant pressure is selected so that the blow-off occurs when driving uphill, i.e. in higher altitudes, where the air pressure is lower than in valleys, than would be the case if the atmospheric air pressure prevailing at the respective height on one side of the membrane would work.
  • the boost pressure limitation is therefore independent of the respective atmospheric pressure and a higher boost pressure is available even when driving uphill.
  • the springs of the valves used there are subject to high levels of heat due to the exhaust gases passing them and thereby change their spring rate over time, so that the valve opens earlier.
  • the blow-off pressure in the charger and thus also the combustion pressures decrease. There is therefore a loss of power in the operating range of the engine mentioned at the beginning.
  • a flap valve has been used which does not require a spring in the blow-off area and the exhaust pressure or, as described in the mentioned EP-A-0 123 990 , operated by another suitable process pressure.
  • the adjusting force acts on a lever which is connected to the valve shaft in a torsionally rigid manner.
  • Such a flap valve is much cheaper to produce than the two known valve types mentioned above.
  • the relaxed exhaust gases after they have done their compression work, together with the mixture of air and exhaust gas that has formed in the mixing zone, ie in the area of the interface between air and exhaust gas, must be completely in be flushed out the exhaust outlet.
  • This purging is supported by the intake air, which enters the rotor cells on the side opposite the exhaust openings, thereby cooling the rotor at the same time.
  • the rotor in order to achieve satisfactory compression efficiency, the rotor must be cooled even further.
  • the pressure wave charger has to draw in more air than it delivers compressed charge air to the engine. These additionally drawn in air is called purge air and the ratio of purge air flow to charge air flow is the "purge level" of the pressure wave charger. This degree of flushing decreases with increasing engine speed and decreasing engine load.
  • Blow-off by wastegate affects a pressure wave charger, primarily, like a turbocharger, the overall efficiency and thus the specific fuel consumption, but not the flushing level. Because the rinsing energy is reduced in proportion to the compression energy.
  • the transverse component of the flow into the exhaust duct does not represent a serious impairment of the exhaust flow and thus the degree of purge.
  • the purge is significantly impaired by the larger cross-component of the inlet speed, and thus the compression efficiency is also impaired.
  • the object of the present invention defined in claim 1 is to avoid these disadvantages of the flap valve which is superior to the known valve types in terms of cheap manufacture and simple construction
  • Fig. 1 denotes a rotor housing, 2 an air housing and 3 a gas housing of a pressure wave charger.
  • the air housing 2 as can be seen in FIG. 2, has a horizontal air inlet nozzle 6 through which air is sucked in from atmospheric pressure, and a vertical charge air outlet nozzle 7, see FIG.
  • FIG. 3 and 4 show the gas housing 3 with the exhaust gas relief valve 8 in a longitudinal section or in a side elevation.
  • the blow-off valve 8 has a flap 9 as the closing element.
  • This is provided with a rivet pin 10 which sits with axial and radial play in a bore in a plate-shaped flap lever 11 and is held therein by means of a washer 12 and a rivet head 13.
  • the flap lever 11 is rigidly connected to the lower end of a flap shaft 14, e.g. by welding.
  • This flap shaft is guided in a bearing bush 15 and extends obliquely upwards through the gas housing 3 to the outside, where it is connected in a torsionally rigid manner to a lever 16.
  • This carries at its free end a bolt 17 for connecting a linkage, not shown, which connects the flap 9 to a control device mentioned at the beginning.
  • a restriction screen 19 is provided at a distance around the flap 9.
  • the current threads which, when using a cheap flap instead of a more expensive, but axially symmetrically flowed plate or mushroom valve, impair the undisturbed outflow in the exhaust duct and thus the flushing of the rotor cells mentioned at the outset, immediately after passing through the annular gap released by the flap in a direction parallel to the axis of the exhaust outlet connection 5 is forced, as is indicated by the dash-dotted streamlines in FIG. 3.
  • the dash-dotted representation of the streamlines was chosen because the flap 9 is shown in the closed state. So it is the streamlines that would occur with the flap open.
  • This restriction screen 19 does not surround the entire circumference of the flap 9, but part of the same as a semicircular ring coaxial with the flap 9, only half of its circumference.
  • the two ends of this semicircular ring then run out into a tip, the inner boundaries of which, viewed radially inward, run parallel to the longitudinal edges of the flap lever 11.
  • the area of the restriction screen that is left blank for the flap lever 11 does not degrade its directionality, since the narrowest point of the flap gap and the flow are located there is also forced in the axially parallel direction by the adjacent wall part of the exhaust gas outlet connection 5.
  • the axis of the restriction screen 20 is eccentric to the axis of the associated flap 21 by the distance x. This gives a larger outflow cross section after the flap gap.
  • the exhaust gas inlet connection 4 is not arranged on the upper side, as in the pressure wave charger according to FIGS. 1 and 2, but on the lower side.
  • restriction screen is also possible to design the restriction screen as a full circular ring, which thus coaxially or eccentrically surrounds the entire circumference of the flap.
  • the flap lever must then be cranked accordingly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Supercharger (AREA)
  • Fluid-Driven Valves (AREA)
  • Exhaust Gas After Treatment (AREA)

Claims (3)

1. Machine à ondes de pression avec une soupape de sortie pour le gaz d'échappement, laquelle machine à ondes de pression présente un corps de rotor (1) avec un rotor à cellules dans lequel le gaz d'échappement d'un moteur à combus comprime l'air de combustion nécessaire au moteur à combustion, avec en outre un corps à air (2), par lequel l'air atmosphérique est aspiré puis, après compression dans le rotor à cellules, est envoyé comme air d'admission au moteur à combustion, ainsi qu'avec un corps à gaz (3) comportant une chambre à gaz d'échappement par laquelle le gaz d'échappement du moteur à combustion arrivant dans le rotor à cellules est conduit puis, après sa détente dans le rotor à cellules, est évacué dans un collecteur d'échappement par un conduit (5) de sortie du gaz d'échappement, dans laquelle la soupa sortie du gaz d'échappement est dispos une paroi du corps à gaz (3) séparant ladite chambre à gaz d'échappement du conduit (5) de sortie du gaz d'échappement et a la forme d'une soupape à clapet, dont le clapet (9) est en relation active par un levier (11) de clapet, un axe (14) de clapet et un levier (16) avec un dispositif de régulation commandé par une pression de marche de la machine à ondes de pression, caractérisée en ce que l'axe du clapet (9; 21) est parallèle à l'axe du conduit de sortie du gaz d'échappement et en ce que, dans le conduit (5) de sortie du gaz d'échappement, il est prévu un écran de confinement (19; 20) qui entoure au moins une partie du contour extérieur du clapet (9; 21) à une certaine distance de son contour extérieur et dont la paroi se prolonge essentiellement parallèlement à l'axe du conduit (5) de sortie du gaz d'échappement à l'intérieur de celui-
2. Machine à ondes de pression suivant la revendication 1, caractérisée en ce que le clapet (9) se présente sous la forme d'un disque circulaire avec un tourillon à rivet (10), qui sert à la liaison avec le levier (11) du clapet, et en ce que la paroi de l'écran de confinement (19) est coaxiale au clapet (9).
3. Machine à ondes de pression suivant la revendication 1, caractérisée en ce que le clapet (21) se présente sous la forme d'un disque circulaire avac un tourillon à rivet, qui sert à la liaison avec le levier du clapet, et en ce que la paroi de l'écran de confinement (20) est excentrée d'une distance (x) par rapport à l'axe du clapet (20),de sorte que le milieu da la paroi de l'écran de confinement (20) est plus éloigné du bord extérieur du clapet (21) que les deux extrémités de la paroi de l'écran de confinement (20).
EP84106843A 1983-06-29 1984-06-15 Machine à ondes de pression comprenant une soupape de sortie pour le gaz d'échappement Expired EP0130433B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84106843T ATE23912T1 (de) 1983-06-29 1984-06-15 Druckwellenlader mit einem abgasabblasventil.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH356183 1983-06-29
CH3561/83 1983-06-29

Publications (2)

Publication Number Publication Date
EP0130433A1 EP0130433A1 (fr) 1985-01-09
EP0130433B1 true EP0130433B1 (fr) 1986-11-26

Family

ID=4258656

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84106843A Expired EP0130433B1 (fr) 1983-06-29 1984-06-15 Machine à ondes de pression comprenant une soupape de sortie pour le gaz d'échappement

Country Status (5)

Country Link
US (1) US4592330A (fr)
EP (1) EP0130433B1 (fr)
JP (1) JPS6013921A (fr)
AT (1) ATE23912T1 (fr)
DE (1) DE3461499D1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0240269Y2 (fr) * 1985-02-19 1990-10-26
JPS62174536A (ja) * 1986-01-27 1987-07-31 Mazda Motor Corp 圧力波過給機付エンジン
DE3922491A1 (de) * 1988-08-23 1990-03-01 Asea Brown Boveri Gasdynamischer druckwellenlader mit abgas bypass
US6055965A (en) * 1997-07-08 2000-05-02 Caterpillar Inc. Control system for exhaust gas recirculation system in an internal combustion engine
KR20010023409A (ko) * 1997-08-29 2001-03-26 스위스 아우토 엔지니어링 에스.아. 가스 동압 파형 기계
JP5939052B2 (ja) * 2012-06-26 2016-06-22 株式会社Ihi 過給機
US20160053090A1 (en) 2013-03-12 2016-02-25 Japan Vilene Company, Ltd. Inorganic nanofiber and method for manufacturing same
US10344666B2 (en) 2014-09-01 2019-07-09 Garrett Transportation I Inc. Turbine wastegate

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0080741A1 (fr) * 1981-11-30 1983-06-08 BBC Aktiengesellschaft Brown, Boveri & Cie. Machine à ondes de pression utilisant la dynamique des gaz comprenant une dérivation des gaz d'échappement

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2800120A (en) * 1953-11-30 1957-07-23 Jendrassik Developments Ltd Pressure exchangers
GB775271A (en) * 1953-12-11 1957-05-22 Jendrassik Dev Ltd Improvements relating to pressure exchangers
US2836346A (en) * 1955-06-17 1958-05-27 Jendrassik Developments Ltd Pressure exchangers
CH349448A (de) * 1955-06-17 1960-10-15 Jendrassik Developments Limite Druckaustauscher
CH351141A (de) * 1956-03-29 1960-12-31 Brian Spalding Dudley Druckaustauscher
GB923368A (en) * 1961-01-30 1963-04-10 Power Jets Res & Dev Ltd Improvements in or relating to pressure exchangers
US4120156A (en) * 1977-06-08 1978-10-17 The Garrett Corporation Turbocharger control
JPS608936Y2 (ja) * 1981-08-11 1985-03-30 三共理化学株式会社 重合研磨翼車輪
DE3461846D1 (en) * 1983-05-02 1987-02-05 Bbc Brown Boveri & Cie Control device for a pressure-wave charger

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0080741A1 (fr) * 1981-11-30 1983-06-08 BBC Aktiengesellschaft Brown, Boveri & Cie. Machine à ondes de pression utilisant la dynamique des gaz comprenant une dérivation des gaz d'échappement

Also Published As

Publication number Publication date
JPH059618B2 (fr) 1993-02-05
ATE23912T1 (de) 1986-12-15
JPS6013921A (ja) 1985-01-24
EP0130433A1 (fr) 1985-01-09
DE3461499D1 (en) 1987-01-15
US4592330A (en) 1986-06-03

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