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WO2011161042A1 - Silencieux à cavité fendue pour gaz brûlés - Google Patents

Silencieux à cavité fendue pour gaz brûlés Download PDF

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Publication number
WO2011161042A1
WO2011161042A1 PCT/EP2011/060198 EP2011060198W WO2011161042A1 WO 2011161042 A1 WO2011161042 A1 WO 2011161042A1 EP 2011060198 W EP2011060198 W EP 2011060198W WO 2011161042 A1 WO2011161042 A1 WO 2011161042A1
Authority
WO
WIPO (PCT)
Prior art keywords
cavity
muffler
inlet
slit
inner tube
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.)
Ceased
Application number
PCT/EP2011/060198
Other languages
English (en)
Inventor
Frank Geelen
Arnoldus Martinus Van Wijk
Petrus Johannes Jozef Sonnemans
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.)
Bekaert Combustion Technology BV
Original Assignee
Bekaert Combustion Technology BV
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 Bekaert Combustion Technology BV filed Critical Bekaert Combustion Technology BV
Publication of WO2011161042A1 publication Critical patent/WO2011161042A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • 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
    • F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with exhaust gas flow passages

Definitions

  • the present invention relates to a muffler, in particular a muffler for use in heating apparatus and a heating system.
  • Heat engines or heating apparatus are often provided with mufflers or sound insulating devices to attenuate the noise produced by an exhaust flow of the heat engine.
  • mufflers or sound insulating devices to attenuate the noise produced by an exhaust flow of the heat engine.
  • US 3,414,078 describes a sound muffler for combustion engines.
  • the sound muffler comprises an outer tube and an inner tube open at both ends located within the outer tube.
  • the outer tube and the inner tube form there between an elongated annular intermediate chamber.
  • the outer tube has a front end adapted to be coupled to the engine and a rear end.
  • a ring member is disposed at the rear end.
  • the inner tube includes a portion that extends past the rear end of the outer tube and opens directly into the atmosphere. The length of the remaining portion of the inner tube extends internally of the outer tube and measured from the ring member inwardly towards the front end amounting to about one half to two thirds of the straightened axial length of the outer tube.
  • the intermediate annular chamber has along its entire length a substantially constant cross section, and supporting means located between the inner and outer tubes to hold the inner tube in substantially coaxial position in the outer tube without significantly reducing the cross-section at this location.
  • a muffler for use in a heating apparatus such as a burner, the muffler comprising: an inlet;
  • the tube assembly comprising:
  • an inner tube having an inlet opening in fluid communication with the inlet and an outlet opening in fluid communication with the outlet;
  • the muffler according to the present invention comprises an inlet, an outlet and a tube assembly arranged between the inlet and the outlet.
  • the muffler can e.g. be applied in a heating system whereby an exhaust flow of a heating engine, such as a burner, can be provided to the inlet of the muffler.
  • the muffler comprises a tube assembly
  • a tube is understood as being an elongated structure having a first opening at one end and a second opening at a second opposing end.
  • a tube may e.g. have a cylindrical shape having a circular cross-sectional first and second opening.
  • a square or rectangular cross-section may be considered as well.
  • a cavity is formed that, at least partly, surrounds the inner tube.
  • a side of the cavity arranged at an outlet side of the muffler is closed, i.e. the side of the tube assembly closest to the outlet.
  • the side of the cavity which is arranged at an inlet side of the muffler, i.e. the side of the tube assembly closest to the inlet, is provided with a slit-shaped opening.
  • a slit is understood as having an elongated shape.
  • the slit as applied is not straight but rather has a curvature corresponding to the curvature of the inner tube.
  • the opening is provided circumferentially about the inner tube.
  • the slit-shaped opening may further be segmented.
  • a longitudinal position of the slit-shaped opening substantially
  • the wall thickness at the opening, and the area of the slit-shaped opening as applied in the muffler according to the invention form the neck of a cavity resonator.
  • the resonance frequency of the cavity corresponds to following formula:
  • S is de dimension of the slit opening, more particularly the surface area of the slit opening (in square meters)
  • t is the thickness of the wall in which the slit has been made
  • V is the volume of the cavity, which can be set by the length of the cavity and the difference in cross sectional area between the outer and the inner tube.
  • the formula is valid for a theoretical ideal Helmholtz resonator. The ideal situation does not exist.
  • the resonance frequency of a resonator will in reality be influenced by the design and by a number of additional parameters, such as the circumference of the slit, the shape of the slit, and e.g. the presence of and size of bridge between slit segments...
  • a closed pipe resonator is also called a 1 ⁇ 4 ⁇ (one-fourth lambda) resonator.
  • the resonance mode of a closed pipe is mainly determined by the length of the pipe or tube.
  • the resonance mode of the cavity may be equal or close to the resonance mode of the closed pipe so that the damping of noises at particular harmful frequencies is increased.
  • the geometry of the cavity may also be selected so that both
  • the slit-shaped opening is provided in a flange which is arranged
  • the flange is deliminating the cavity at the inlet side of the muffler. More preferably, the surface of the flange (the flange with the slit-shaped opening) is perpendicular to the axis of the inner tube.
  • a flange in which the slit-shaped opening is provided and in particular use of a flange (in which the slit-shaped opening is provided) perpendicular to the axis of the inner tube has specific benefits, e.g. compared to a conical inlet part of the outer tube.
  • a benefit is that the band width over which damping occurs is larger. This means that noise is attenuated over a broader frequency range.
  • the area of the slit-shaped opening is less than 10% of the difference in cross sectional area of the outer and the inner tube; more preferably, less than 5%, even more preferably more than 3%. It is a benefit of these values of the surface area of the slit-shaped opening compared to the difference in cross sectional area of the outer and the inner tube that small values for the ratio of S (surface area of the slit opening) over V (volume of the cavity) can be obtained without the length of the cavity having to be too large. This ratio determines the resonance frequency f of the cavity.
  • the length of the cavity can first be selected in order to set the
  • the values for the other design parameters can be set accordingly, benefitting from using small areas of the slit-shaped opening for beneficially selecting the other properties (wall thickness t; and the difference between the diameters of the outer tube and the inner tube, determining the volume V of the cavity).
  • the muffler according to the invention further comprises and inlet- and/or outlet cavity.
  • the muffler according to the invention may advantageously be applied in a
  • the heating system comprising a heat engine, whereby the muffler is mounted to the heat engine for receiving the exhaust flow from the heat engine in a vertical direction, thereby arranging the slit-shaped opening of the cavity as a lowest point of the cavity.
  • the heating system comprising a heat engine, whereby the muffler is mounted to the heat engine for receiving the exhaust flow from the heat engine in a vertical direction, thereby arranging the slit-shaped opening of the cavity as a lowest point of the cavity.
  • Figure 1 schematically depicts a first embodiment of a muffler according to the invention
  • Figure 2 schematically depicts a cross-section view along line A-A of Figure 1 ;
  • Figure 3 schematically depicts a second embodiment of a muffler according to the invention.
  • the muffler comprises an inlet 100 and a tube assembly 1 10 comprising an inner tube 1 12 (having a diameter d) and an outer tube 1 14 (having a diameter D) which are, in the arrangement as shown, concentrically arranged thereby obtaining a cavity 120 arranged between the inner and outer tube.
  • an exhaust flow e.g. from a combustion process in a heat engine
  • the outer and inner tube substantially have the same length l res .
  • the cavity is closed.
  • the slit-shaped opening 130 is arranged circumferentially about the inner tube.
  • the inlet opening thus has a cylindrical shape
  • the slit-shaped opening may thus be a ring- shaped opening surrounding the inner tube.
  • the slit-shaped opening consists of a segmented ring-shaped opening.
  • such a ring shaped opening comprises three segments separated by bridges connecting the inner tube 1 12 and a flange 140.
  • the inner tube 1 12 the segmented ring-shaped opening consisting of three segments 130.1 , 130.2 and 130.3 each substantially spanning an angle of 120° and three bridges 135 connecting the inner tube 1 12 to the flange 140 connected to the outer tube 1 14 to maintain a relative position between the inner and outer tube.
  • the cross-sectional area of the bridges is small compared to the cross-sectional area of the slit-shaped opening, the effect of the bridges on the damping properties of the muffler is comparatively small.
  • the application of the bridges as indicated is not essential to the invention.
  • the bridges have a width (measured in tangential direction of the cross section of the inner tube) between 1 and 15 mm; more preferably between 3 and 10 mm.
  • the material thickness of the flange140 is of the same order of magnitude as the width of the slit-shaped opening.
  • the material thickness of the flange can e.g. be 2 mm, whereas the width of the slit-shaped opening can e.g. be 3 mm.
  • a resonator having a comparatively high Q- factor may be highly effective at a particular frequency and may be virtually ineffective at other frequencies. As such, it may be preferred to design the cavity resonator as having a comparatively small Q-factor because such a resonator can be considered to be effective over an, albeit small, frequency range rather then being effective at a specific frequency only.
  • FIG 3 a second embodiment of a muffler according to the present invention is schematically depicted.
  • the muffler as shown in Figure 3 further comprises an inlet 100 having an inlet cavity 200 and an outlet 105 having an outlet cavity 210.
  • the inlet cavity 200 having a length 11 in the longitudinal direction 160, is obtained by increasing the cross-section of the inlet from a inlet diameter d1 to a diameter D.
  • the outlet cavity 210 having a length I3 in the longitudinal direction 160, is obtained by decreasing the cross-section of the outlet from an outlet diameter D to a diameter d3.
  • the reduction in cross-section need not be as abrupt as indicated, a tapered shape of the inlet or outlet may also result in the creation of an inlet or outlet cavity.
  • the ratio of the cross-section at a diameter D over the cross-section at a diameter d1 or d3, should at least be a factor 2.
  • the tube assembly of the muffler i.e. inner tube 1 12, outer tube 1 14 and slit 130
  • the tube assembly of the muffler i.e. inner tube 1 12, outer tube 1 14 and slit 130
  • the tube assembly of the muffler having a length I2 in Figure 3
  • the tube assembly of the muffler can be considered to be unattached and may operate at an open pipe resonance frequency.
  • the addition of the inlet cavity and the outlet cavity enables to create additional resonance modes in the muffler. These other modes may, like other resonance modes of the muffler, contribute to the damping of noise.
  • the muffler according to an embodiment of the invention may not be limited to resonate at a particular frequency but rather, may resonate at a frequency range.
  • the muffler can be combined with a heat engine thus forming a heating system whereby an exhaust flow of the heat engine is provided to the inlet of the muffler.
  • the slit-shaped opening 130 of the cavity is positioned in the lowest point of the cavity enabling moisture which condensates in the cavity to be easily drained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

L'invention concerne un silencieux pour une machine thermique telle un brûleur et un système de chauffage. Le silencieux comporte une entrée (100), une sortie (105) et un ensemble de tubes (110) arrangé entre l'entrée et la sortie. L'ensemble de tubes comporte un tube intérieur (112) ayant une ouverture d'entrée (112.1) en communication fluidique avec l'entrée (100) et une ouverture de sortie (112.2) en communication fluidique avec la sortie (105). L'ensemble de tubes (110) comporte par ailleurs un tube extérieur (114), entourant au moins partiellement le tube intérieur (112), pour définir ainsi une cavité (120) entre le tube intérieur (112) et le tube extérieur (114), ce par quoi un côté de la cavité (120) se trouvant au niveau d'un côté sortie du silencieux est fermé et ce par quoi un côté de la cavité (120) se trouvant au niveau d'un côté entré du silencieux comporte une ouverture, ladite ouverture ayant une forme de fente (130). Le silencieux peut être avantageusement dans un système de chauffage comprenant une machine thermique, de préférence en une position verticale de sorte que l'ouverture d'entrée est arrangée pour être plus basse par rapport à l'ouverture de sortie.
PCT/EP2011/060198 2010-06-22 2011-06-20 Silencieux à cavité fendue pour gaz brûlés Ceased WO2011161042A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP10166740 2010-06-22
EP10166740.0 2010-06-22

Publications (1)

Publication Number Publication Date
WO2011161042A1 true WO2011161042A1 (fr) 2011-12-29

Family

ID=43302482

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/060198 Ceased WO2011161042A1 (fr) 2010-06-22 2011-06-20 Silencieux à cavité fendue pour gaz brûlés

Country Status (1)

Country Link
WO (1) WO2011161042A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017126508A1 (fr) * 2016-01-21 2017-07-27 フタバ産業株式会社 Silencieux
WO2018185538A1 (fr) * 2017-04-04 2018-10-11 Bombardier Recreational Products Inc. Silencieux pour un moteur à combustion interne

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3348629A (en) * 1965-10-07 1967-10-24 Gen Motors Corp Resonator silencer
US3414078A (en) 1966-03-15 1968-12-03 Andersson Louis Tuned resonance muffler
US3642095A (en) 1968-03-22 1972-02-15 Fujii Koygo Kk Muffler
US4574913A (en) * 1983-11-11 1986-03-11 Sankei Giken Kogyo Kabushiki Kaisha Muffler with spark arresting function
GB2229224A (en) * 1989-03-15 1990-09-19 Zschopau Motorrad Veb I.c. engine exhaust system
EP1209348A1 (fr) * 2000-11-23 2002-05-29 Westaflex-Automobile S.A. Dispositif formant silencieux, notamment pour un moteur turbo
US20070107982A1 (en) * 2005-11-17 2007-05-17 Sullivan John T Flow-through sound-cancelling mufflers

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3348629A (en) * 1965-10-07 1967-10-24 Gen Motors Corp Resonator silencer
US3414078A (en) 1966-03-15 1968-12-03 Andersson Louis Tuned resonance muffler
US3642095A (en) 1968-03-22 1972-02-15 Fujii Koygo Kk Muffler
US4574913A (en) * 1983-11-11 1986-03-11 Sankei Giken Kogyo Kabushiki Kaisha Muffler with spark arresting function
GB2229224A (en) * 1989-03-15 1990-09-19 Zschopau Motorrad Veb I.c. engine exhaust system
EP1209348A1 (fr) * 2000-11-23 2002-05-29 Westaflex-Automobile S.A. Dispositif formant silencieux, notamment pour un moteur turbo
US20070107982A1 (en) * 2005-11-17 2007-05-17 Sullivan John T Flow-through sound-cancelling mufflers

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017126508A1 (fr) * 2016-01-21 2017-07-27 フタバ産業株式会社 Silencieux
WO2017126083A1 (fr) * 2016-01-21 2017-07-27 フタバ産業株式会社 Silencieux
US10961895B2 (en) 2016-01-21 2021-03-30 Futaba Industrial Co., Ltd. Muffler
WO2018185538A1 (fr) * 2017-04-04 2018-10-11 Bombardier Recreational Products Inc. Silencieux pour un moteur à combustion interne
CN110505923A (zh) * 2017-04-04 2019-11-26 庞巴迪动力产品公司 用于内燃发动机的消声器
RU2719886C1 (ru) * 2017-04-04 2020-04-23 Бомбардье Рекриэйшенел Продактс Инк. Глушитель для двигателя внутреннего сгорания
US11002165B2 (en) 2017-04-04 2021-05-11 Bombardier Recreational Products Inc. Muffler for an internal combustion engine

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