WO1983002302A1 - Procede et dispositif pour reduire le bruit des moteurs a combustion - Google Patents

Procede et dispositif pour reduire le bruit des moteurs a combustion Download PDF

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Publication number
WO1983002302A1
WO1983002302A1 PCT/EP1982/000278 EP8200278W WO8302302A1 WO 1983002302 A1 WO1983002302 A1 WO 1983002302A1 EP 8200278 W EP8200278 W EP 8200278W WO 8302302 A1 WO8302302 A1 WO 8302302A1
Authority
WO
WIPO (PCT)
Prior art keywords
internals
sound
nozzle
flow
zone
Prior art date
Application number
PCT/EP1982/000278
Other languages
German (de)
English (en)
Inventor
Hartmut Rosenberg
Original Assignee
Hartmut Rosenberg
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 Hartmut Rosenberg filed Critical Hartmut Rosenberg
Publication of WO1983002302A1 publication Critical patent/WO1983002302A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/06—Valve members or valve-seats with means for guiding or deflecting the medium controlled thereby, e.g. producing a rotary motion of the drawn-in cylinder charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1205—Flow throttling or guiding
    • F02M35/1227—Flow throttling or guiding by using multiple air intake flow paths, e.g. bypass, honeycomb or pipes opening into an expansion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/033—Noise absorbers
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/161—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general in systems with fluid flow
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a method for reducing or transforming the sound emission and also relates to a device for reducing the sound, in particular in internal combustion engines.
  • the invention is based on the knowledge that the low-frequency internal gas pressure fluctuations (level) are responsible for the intensity of the sound transmission, for example in an exhaust system.
  • the invention is based on the object of specifying a method and a device such that, for example, the silencer of an internal combustion engine can be dispensed with.
  • the preferred procedure is to destroy the shear stress, which in particular reduces the quadrupole sources which are responsible for the decisive sound component in the case of gas expansion, and the associated vortex formation.
  • a preferably device for reducing the sound s s arising in the expansion zone, in particular in internal combustion engines on exhaust valves, is characterized by installations in the core zone of the flow field immediately behind the exhaust valve.
  • the measure according to the invention makes it possible to reduce the sound emission of an exhaust gas or gas volume flow from an (exhaust) valve in general and in particular from an internal combustion engine
  • the core zone of an exhaust gas jet is therefore destroyed or dissolved immediately after the valve exits. This ensures better flow guidance by preventing larger eddy formation.
  • These low-frequency components are thus shifted to higher sound frequencies.
  • the sound emission in relation to the sound transmission in the gas is reduced (mouth noise) by the fact that high-frequency sound components dissipate more quickly in a medium.
  • the local sound radiation is also reduced by reducing the internal gas pressure fluctuation.
  • the internals arranged directly behind the outlet valve are designed to be flow-promoting, particularly in the case of adjoining curved lines, as flow rectifiers.
  • the internals in cross section can consist of a honeycomb, tube, trapezoidal or sieve-shaped grid, or of further flow and pressure compensating flow straighteners.
  • the internals can be inserted, held in place by a snap ring on the exhaust pipe attachment, or attached to the valve stem.
  • the space in the area of the beam outlet and the core zone present here should be expanded in relation to the exhaust gas discharge line.
  • FIG. 1 shows a section through an embodiment according to the invention.
  • Fig. 2 shows a section through designs of details 3 shows a detail according to FIG. 2c;
  • Fig. 4 gives considerations regarding free jets
  • FIGS. 6 and 7 explain the effects on the subject of the application (shift against low-frequency vibrations).
  • Fig. 1 shows a section through the cylinder head of an internal combustion engine with the exhaust valve 10, the associated exhaust valve slots 12 (the piston is indicated at 14), the exhaust pipe 16 and the inventive construction of the internals 18.
  • These internals which are in cross section according to FIG. 2nd are formed, are pushed into the exhaust manifold 20 and fastened in a manner not shown, for example by flanging onto the exhaust pipe 16 or by means of a circlip, also not shown.
  • the internals follow the course of the exhaust manifold.
  • Fig. 2a shows in cross section a purely lattice-like design of such internals
  • Fig. 2b shows tubular internally fixed internals; Fig. 2c leaves honeycomb internals; Fig. 2d recognize trapezoidal internals.
  • the internals can also be sieve-shaped. All of them serve to divide the strong free jet into a large number of parallel rays, which are substantially less turbulent than the original free jet, in the area of the core zone
  • Quadrupole sources are destroyed, the division into smaller, parallel, parallel beams whose local velocity gradient is ⁇ ⁇ ⁇ ⁇ eslich smaller.
  • the volume of the internals is limited only to the extent that excessive pressure losses are not acceptable.
  • Diagrams 4 and 5 show investigations on ring nozzles and valves. These diagrams allow an estimation of the results for undamped and damped conditions according to the invention.
  • FIG. 4 explains the average flow velocities and speed fluctuations of undisturbed free jets, namely a) for nozzles b) for ring nozzles.
  • the noise reduction was, for example, 20 dB.
  • the combined measure of the expansion space in the expansion zone and the built-in components further reduce the effect of lowering the noise level and avoiding standing waves in the exhaust pipe.
  • the measure according to the invention makes it possible to dispense entirely with a silencer in the exhaust line.

Abstract

Procédé et dispositif de réduction du bruit, notamment à haute fréquence, des moteurs à combustion. A cet effet, des éléments (18) sont insérés directement après les sièges (12) des soupapes d'échappement. Le bruit d'échappement peut être diminué de 15 dB et le cas échéant on peut renoncer à un pot d'échappement. Application: moteurs à combustion.
PCT/EP1982/000278 1981-12-30 1982-12-30 Procede et dispositif pour reduire le bruit des moteurs a combustion WO1983002302A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3151873.7811230 1981-12-30
DE19813151873 DE3151873A1 (de) 1981-12-30 1981-12-30 Verfahren zum vermindern bzw. transformieren der schallemission sowie vorrichtung zur verminderung des schalls, insbesondere bei verbrennungsmotoren

Publications (1)

Publication Number Publication Date
WO1983002302A1 true WO1983002302A1 (fr) 1983-07-07

Family

ID=6149990

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1982/000278 WO1983002302A1 (fr) 1981-12-30 1982-12-30 Procede et dispositif pour reduire le bruit des moteurs a combustion

Country Status (3)

Country Link
EP (1) EP0097683A1 (fr)
DE (1) DE3151873A1 (fr)
WO (1) WO1983002302A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2472859C1 (ru) * 2011-05-18 2013-01-20 Государственное образовательное учреждение высшего профессионального образования Первый Московский государственный медицинский университет им. И.М. Сеченова Министерства здравоохранения и социального развития Российской Федерации (ГОУ ВПО Первый МГМУ им. И.М. Сеченова Минздравсоцразвития России) Способ формирования систем маркеров метилирования днк
DE102017206430A1 (de) * 2017-04-13 2018-10-18 Arno Leuschner Vorrichtung zur Weiterleitung eines gasförmigen Volumenstroms bei einem Verbrennungsmotor und Verfahren zum Betrieb eines Verbrennungsmotors sowie Verfahren zur Nachrüstung eines Verbrennungsmotors
CN113539222B (zh) * 2021-08-20 2023-12-15 连云港长锦电力设备有限公司 一种高效排气消声器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1078871A (fr) * 1953-06-17 1954-11-24 Nat Res Dev Méthode et moyens pour réduire le bruit produit par l'écoulement de gaz au traven d'orifices
US3503465A (en) * 1966-08-05 1970-03-31 Chiyoda Chem Eng Construct Co Silencer for suction or discharge of fluids under pressure
US3579981A (en) * 1970-05-06 1971-05-25 Chrysler Corp Anti-pollution exhaust valve combination with fluidic control and valve cooling features
US3884323A (en) * 1974-07-11 1975-05-20 Du Pont Device for gas-exit ducts to convert vortical gas flow to sound-attenuated axial gas flow
DE2533669A1 (de) * 1974-08-02 1976-02-19 Ford Werke Ag Verfahren und einrichtung zum regeln der auspuffemissionen einer verbrennungskraftmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1078871A (fr) * 1953-06-17 1954-11-24 Nat Res Dev Méthode et moyens pour réduire le bruit produit par l'écoulement de gaz au traven d'orifices
US3503465A (en) * 1966-08-05 1970-03-31 Chiyoda Chem Eng Construct Co Silencer for suction or discharge of fluids under pressure
US3579981A (en) * 1970-05-06 1971-05-25 Chrysler Corp Anti-pollution exhaust valve combination with fluidic control and valve cooling features
US3884323A (en) * 1974-07-11 1975-05-20 Du Pont Device for gas-exit ducts to convert vortical gas flow to sound-attenuated axial gas flow
DE2533669A1 (de) * 1974-08-02 1976-02-19 Ford Werke Ag Verfahren und einrichtung zum regeln der auspuffemissionen einer verbrennungskraftmaschine

Also Published As

Publication number Publication date
DE3151873A1 (de) 1983-07-07
EP0097683A1 (fr) 1984-01-11

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