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
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
  • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
  • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
  • F01N3/0335—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with exhaust silencers in a single housing
• • 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
  • F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
• • 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
  • 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
  • F01N1/082—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases passing through porous members
• • 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
  • F01N1/083—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using transversal baffles defining a tortuous path for the gases or successively throttling gas flow
• • 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
  • F01N1/084—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases flowing through the silencer two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes
• • 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
  • F01N1/086—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling having means to impart whirling motion to the gases
  • F01N1/088—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling having means to impart whirling motion to the gases using vanes arranged on gas flow path or gas flow tubes with tangentially directed apertures
• • 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
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
  • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
• • 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 an exhaust silencer according to the preamble of Claim 1 , comprising a housing that is to be connected to an exhaust pipe, exhaust gases being arranged to be conveyed through the housing that comprises a reactive part and an absorbing part in the flow direction of the exhaust gases.
• the purpose of the invention is to provide an improved solution to the above- mentioned problem that is related to the noise suppression of the exhaust gases of large combustion engines, in particular.
• the purpose of the invention is to provide an exhaust silencer, which eliminates various fre- quencies of acoustic noise in a structurally advantageous manner and as effectively as possible.
• a further purpose of the invention is to provide a silencer that is also capable of purifying the exhaust gases.
• the reactive part of the silencer is mainly hollow and comprises, at its inlet, a first exhaust pipe for feeding the exhaust gases to the reactive part and, at its outlet, a second exhaust pipe for conducting the exhaust gases from the reactive part to the absorbing part, both exhaust pipes being arranged to essentially extend inside the reactive part of the housing.
• the absorbing part comprises an absorbing filling element, which essentially fills the absorbing part of the housing and, at the inlet of the absorbing part, is formed so as to direct the exhaust gases to the space between the filling element and the inner lining of the housing.
• the structure according to the invention can be used to effectively suppress the low, medium and high frequencies of the exhaust noise of the engine.
• the solution is also advantageous regarding the total counterpressure caused by the exhaust system.
• the said first and second exhaust pipes are preferably dimensioned so that they suppress the lowest frequencies of the exhaust noise by utilizing the mutual suppressive interference of sonic waves.
• the mouths of the said first and second exhaust pipes that are situated opposite each other are also arranged at a distance from each other.
• the said first exhaust pipe extends inside the reactive part for about one fourth of the total length of the reactive part.
• the said second exhaust pipe extends inside the reactive part for about a half of the total length of the reactive part.
• spark quenching means By arranging spark quenching means between the reactive part and the absorbing part, the soot particles in the exhaust gases can effectively be separated be- fore the exhaust gases are released into the environment. In that case, besides purifying the exhaust gases as such, the purpose is also to prevent sparks from escaping out of the exhaust pipe and from possibly causing fire safety risks.
• the spark quenching means preferably comprise a number of radially extending plate elements, which are formed so as to direct the exhaust gas flow into a rotating movement around the filling element of the absorbing part.
• the soot particles can effectively be directed onto the inner lining of the housing under the effect of centrifugal force.
• a soot trap door in the longitudinal direction of the housing, the soot particles can then be recovered and, where necessary, easily removed from the housing.
• the space between the housing and the filling element can be rendered relatively small compared to the diameter of the filling element.
• the total cross-sectional area of the space can be kept large enough, so that the ar- rangement does not increase the counterpressure of the exhaust silencer to a considerable extent.
• the arrangement for its part, also improves the suppression of medium and high-frequency noise.
• the filling element on the side of the re- active part is preferably sharp-pointed, and most preferably conical.
• the filling element preferably mainly consists of mineral wool, which is arranged inside a perforated plate, net or the like that is supported on the housing.
• the housing is preferably situated in the vertical direction, so that the exhaust gases are fed into the housing from below.
• Fig. 1 shows an embodiment of the exhaust silencer according to the invention as a longitudinal section
• FIG. 2 shows an axonometric illustration of the silencer of Fig. 1 , with the housing of the silencer cut open and the absorbing material removed.
• the reference number 1 refers to the housing of the exhaust silencer, which is attached to the exhaust pipe of a combustion engine to direct the exhaust gases through the silencer.
• the housing 1 comprises a reactive part 2 and an absorbing part 3, which are arranged sequentially in the flow direction. Between these, there are the spark quenching means 4.
• the reactive part 2 is intended for suppressing low noises and it includes a first exhaust pipe 5, through which the exhaust gases are fed into the housing 1 , and a second exhaust pipe 6, which is arranged at a distance from the first exhaust pipe 5 and through which the exhaust gases are directed, through the spark quenching means 4, to the absorbing part 3, wherein the suppression of medium and high-frequency exhaust noise, in turn, is provided before the ex- haust gases are directed out of the silencer and into the environment.
• the first exhaust pipe 5 extends inside the reactive part 2 for about one fourth of the total length of the reactive part 2.
• the second exhaust pipe 6 extends inside the reactive part 2 for about a half of the total length of the reactive part 2.
• the dimensioning should also take into consideration the sparking frequency of the combustion engine and the diameters of the silencer and the exhaust pipe of the engine, as well as the respective requirements made of noise suppression.
• the absorbing part 3 contains a filling element 7, which preferably consists of mineral wool and is surrounded by a perforated plate material, wire mesh or the like, which is supported on the housing 1.
• the filling element 7 is rendered conical, so that the exhaust gases are directed to the space 8 between the inner lining of the housing 1 and the filling element 7 to be further conducted outside.
• the spark quenching means 4 include a number of radially extending plate elements 9, which are shaped so as to direct the exhaust gas flow into a rotating movement around the filling element 7 of the absorbing part.
• the rotating movement thus provided is tailor-made to direct the soot particles, which are heavier than the exhaust gases, towards the inner lining of the housing 1 , where they can be easily recovered and removed from the housing through a longitu- dinal soot trap door 10.
• the exhaust silencer according to the invention preferably has a rotationally symmetrical structure, and it can preferably be situated in the vertical direction, in so far as the application so requires. In this position, the soot door is also easy to open and empty.
• the structure of the exhaust silencer according to the invention is advantageous regarding the total counterpressure inflicted on the exhaust system. Furthermore, the spark quenching means can easily be integrated into it, directing, for their part, the exhaust gases radially outwards towards the inner lining of the housing.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=39004313

Family Applications (1)

Country Status (5)

Families Citing this family (7)

Family Cites Families (6)

• 2008
  • 2008-01-09 FI FI20085013A patent/FI124220B/fi not_active IP Right Cessation
• 2009
  • 2009-01-02 EP EP09701195A patent/EP2227621A1/en not_active Withdrawn
  • 2009-01-02 CN CN2009801016659A patent/CN101918685B/zh active Active
  • 2009-01-02 KR KR20107014976A patent/KR101483985B1/ko not_active IP Right Cessation
  • 2009-01-02 WO PCT/FI2009/050003 patent/WO2009087270A1/en active Application Filing

Non-Patent Citations (1)

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