SE523132C2 - Device for sound and thermal insulation of exhaust emissions on portable power tools - Google Patents

Device for sound and thermal insulation of exhaust emissions on portable power tools

Info

Publication number
SE523132C2
SE523132C2 SE0100498A SE0100498A SE523132C2 SE 523132 C2 SE523132 C2 SE 523132C2 SE 0100498 A SE0100498 A SE 0100498A SE 0100498 A SE0100498 A SE 0100498A SE 523132 C2 SE523132 C2 SE 523132C2
Authority
SE
Sweden
Prior art keywords
expansion chamber
sound
housing
exhaust gases
thermal insulation
Prior art date
Application number
SE0100498A
Other languages
Swedish (sv)
Other versions
SE0100498L (en
SE0100498D0 (en
Inventor
Gustaf Doeragrip
Original Assignee
Electrolux Ab
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 Electrolux Ab filed Critical Electrolux Ab
Priority to SE0100498A priority Critical patent/SE523132C2/en
Publication of SE0100498D0 publication Critical patent/SE0100498D0/en
Priority to PCT/SE2002/000242 priority patent/WO2002064956A1/en
Priority to US10/257,606 priority patent/US20030154950A1/en
Publication of SE0100498L publication Critical patent/SE0100498L/en
Publication of SE523132C2 publication Critical patent/SE523132C2/en

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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/082—Other arrangements or adaptations of exhaust conduits of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation
    • 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
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
    • 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
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • F02B77/13—Acoustic insulation
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation

Landscapes

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

Abstract

The claimed invention illustrates a solution that will make it possible to lead exhaust gas from a combustion engine (10) through a noise insulating cover (11) without reducing the noise insulating effect of the cover (11). This is possible by leading the exhaust gas through an expansion chamber (15) made of a material that insulates the cover (11) from the high temperature exhaust gas. The expansion chamber (15) is shaped so that the exhaust gas is lead through a curved channel in order to prevent the noise from spreading outside the cover (11).

Description

-vsnr 523 132 2 avgaserna. Avgaserna måste också ledas ut på ett sådant sett att höljet bibehåller en god isolering av ljudet som alstras av motorn och andra delar som kan finnas innanför höljet. Denna patentansökan presenterar en enkel och funktionell lösning på det ovan beskrivna problemet. -vsnr 523 132 2 the exhaust gases. The exhaust gases must also be led out in such a way that the housing maintains a good insulation of the sound generated by the engine and other parts that may be inside the housing. This patent application presents a simple and functional solution to the problem described above.

För att inte verktygets hölje skall skadas av de heta avgaserna är en expansionskammare fast monterad i höljet. Placeringen kan variera på olika verktyg beroende på tillgängligt utrymme och de olika komponenternas placering.To prevent the tool housing from being damaged by the hot exhaust gases, an expansion chamber is permanently mounted in the housing. The placement can vary on different tools depending on the available space and the placement of the different components.

Expansionskammaren är tillverkad av ett lämpligt valt material som både ger god termisk isolering så att inte det omgivande höljet skadas på grund av värmen från de heta avgaserna samt har goda ljudisolerande egenskaper så att höljets ljudisolerande egenskaper inte går förlorade. Expansionskammaren är formad så att avgaserna paserar genom ett böjt eller krokigt utrymme så att ljudvågoma i möjligaste mån förhindras att leta sig ut ut höljet via expansionskammaren. I den bifogade ritningen leds avgaserna genom en S-formad expansionskammare för att erhålla en bra ljudisolering.The expansion chamber is made of a suitably selected material that both provides good thermal insulation so that the surrounding casing is not damaged due to the heat from the hot exhaust gases and has good sound-insulating properties so that the sound-insulating properties of the casing are not lost. The expansion chamber is shaped so that the exhaust gases pass through a curved or crooked space so that the sound waves are as far as possible prevented from finding their way out of the housing via the expansion chamber. In the accompanying drawing, the exhaust gases are led through an S-shaped expansion chamber to obtain good sound insulation.

Expansionskammarens inlopp är format så att inloppsarean har större tvärsnitt än utloppsröret från motor/ljuddämpare. Utloppsröret från motom/ljuddämparen är instucken i expansionskammarens öppning. Runt inloppsröret bildas då en öppning mellan expansionskammarens inlopp och utloppsröret. Detta resulterar i en ejektorverkan vid inloppet till kammaren vilket medför att luft från höljets innanrnäte sugs med in i expansionskammaren. Luften från höljets inanmäte blandar sig med de heta avgaserna i kammaren vilket får till följd att temperaturen på avgaserna sänks innan de fortsätter ut i den omgivande luften.The inlet of the expansion chamber is designed so that the inlet area has a larger cross section than the outlet pipe from the motor / silencer. The outlet pipe from the motor / muffler is inserted into the opening of the expansion chamber. An opening is then formed around the inlet pipe between the inlet of the expansion chamber and the outlet pipe. This results in an ejector action at the inlet to the chamber, which means that air from the inner network of the housing is sucked into the expansion chamber. The air from the inside of the housing mixes with the hot exhaust gases in the chamber, which has the consequence that the temperature of the exhaust gases is lowered before they continue out into the ambient air.

Det omgivande höljet kan tack vare expansionskammarens värrneisolerande egenskaper tillverkas i ett lätt och ljudisolerande material som ej behöver vara tåligt mot höga temperaturer vilket är fördelaktigt för såväl ljudnivån som verktyget avger, vikten på verktyget samt förenklad tillverkning av höljet. 523 13; Figur 1: Visar ett vertikalsnitt genom en första utföringsforni av uppfinningen där avgaser leds ut ur ett hölje via en expansionskammare.Thanks to the thermal insulation properties of the expansion chamber, the surrounding housing can be made of a light and sound-insulating material that does not have to be resistant to high temperatures, which is advantageous for both the sound level and the tool emits, the weight of the tool 523 13; Figure 1: Shows a vertical section through a first embodiment of the invention where exhaust gases are led out of a housing via an expansion chamber.

Figur 2: Visar ett vertikalsnitt genom en andra utföringsform av uppfinningen.Figure 2: Shows a vertical section through a second embodiment of the invention.

En ryggburen lövblåsare enligt uppfinningen innefattar en motor 11, ljuddämpare 12 och fläkt 13 som är inkapslade i ett ljudisoleande hölje 10. Höljet 10 som även fungerar som fäste för en icke visad bäranordning har ett luftintag 14 anordnat på den sida av höljet 10 som kommer att vara vänd mot bärarens rygg.A back-mounted leaf blower according to the invention comprises a motor 11, muffler 12 and fl genuine 13 which are encapsulated in a sound-insulating housing 10. The housing 10 which also acts as a bracket for a support device (not shown) has an air intake 14 arranged on the side of the housing 10 which will be be facing the back of the wearer.

Höljet 10 uppbär en expansionskammare 15 som är placerad så att ett utloppsrör 16 från ljuddärnparen 12 är placerat i en inloppskanal 17 i expansionskammaren 15.The housing 10 carries an expansion chamber 15 which is positioned so that an outlet pipe 16 from the sound barrier pair 12 is placed in an inlet duct 17 in the expansion chamber 15.

Inloppskanalen 17 har större tvärsnittsarea än ljuddämparens utloppsrör 16 vilket ger en ejektorverkan så att luft inifrån höljet 10 sugs med in i expansionskammaren 15 och blandas med avgasema från ljuddämparen 12 för att sedan lämna expansionkammaren 15 genom utloppet 18. Expansionskamrnaren 15 är företrädelsevis tillverkad av ett keramiskt material med såväl termiskt isolerande egenskaper som ljudisolerande egenskaper medan höljet 10 företrädelsevis är tillverkat av lämpligt plastmaterial. Expansionskammaren 15 är formad som ett S för att inte ljudvågor skall kunna tränga ut från höljets 10 insida till omgivningen.The inlet duct 17 has a larger cross-sectional area than the outlet pipe 16 of the muffler, which gives an ejector effect so that air from inside the housing 10 is sucked into the expansion chamber 15 and mixed with the exhaust gases from the muffler 12 to then leave the expansion chamber 15 through the outlet 18. The expansion chamber 15 is material with both thermal insulating properties and sound insulating properties, while the housing 10 is preferably made of suitable plastic material. The expansion chamber 15 is shaped like an S so that sound waves cannot penetrate from the inside of the housing 10 to the surroundings.

Om expansionskammaren 15 används på ett verktyg där ett undertryck råder inanför det isolerande höljet 10 bör utloppsröret 16 från ljuddämparen 12 förses med en bricka 19 som täcker åtminstone en del av inloppskanalen 17 till expansionskammaren 15. Detta för att en tillräckligt stark ejektorverkan skall uppstå vid inloppskanalen 17 och därmed förhindra att de heta avgaserna från motorn ll sugs in utrymmet innanför höljet 10 istället för att pasera genom expansionskammaren 15 och ut i den omgivande luften. Brickan 19 placeras företrädelsevis på så sätt att den ej anligger mot inloppskanalens 17 sidoväggar för att vibrationer och värme ej skall ledas från brickan 19 till höljet 10. Brickans 19 storlek och placering väljs så att öppningen mellan brickan 19 och inloppskanalen 17 får en sådan storlek att det uppstår en tillräckligt stor ejektorkraft in i expansionskammaren 15. Luft sugs då från från höljets insida in i expansionskammaren 15.If the expansion chamber 15 is used on a tool where a negative pressure prevails inside the insulating housing 10, the outlet pipe 16 from the muffler 12 should be provided with a washer 19 covering at least a part of the inlet duct 17 to the expansion chamber 15. This is to have a sufficiently strong ejector 17 and thereby prevent the hot exhaust gases from the engine 11 from being sucked into the space inside the housing 10 instead of passing through the expansion chamber 15 and out into the ambient air. The washer 19 is preferably placed in such a way that it does not abut against the side walls of the inlet duct 17 so that vibrations and heat are not conducted from the washer 19 to the housing 10. The size and location of the washer 19 is chosen so that the opening between the washer 19 and the inlet duct 17 a sufficiently large ejector force arises into the expansion chamber 15. Air is then sucked from from the inside of the housing into the expansion chamber 15.

Claims (1)

1. '523 132 4 Patentkrav . Anordning för ljud och/eller termisk isolering av avgasutsläpp på portabla fórbränningsmotordrivna verktyg, tex lövblåsare, trimmers eller liknande, med ett ljudisolerande hölje (10) runt motor (11) eller andra ljudalstrande delar, kännetecknad av att avgasema leds ut ur höljet (10) via en expansionskammare (15) tillverkad av ett värmeisolerande material integrerad i höljet (10). . Anordning enligt krav 1, kännetecknad av att expansionskammaren (15) är tillverkad av ett keramiskt material. . Anordning enligt krav 1 eller 2, kännetecknad av att expansionskammaren (15) är tillverkad av ett material med ljudisolerande egenskaper. . Anordning enligt något av föregående krav, kännetecknad av att expansionskammarens (15) inloppskanal (17) är större än utloppsröret (16) från ljuddämparen (12) så att luft från höljets (10) insida sugs med in i expansionskammaren (15) och blandas med avgaserna i expansionskammaren (15). . Anordning enligt krav 4', kännetecknad av att utloppsröret (16) omges av en bricka (19) för reglering av storleken på öppningen till inloppskanalen (17). . Anordning enligt något av föregående krav, kännetecknad av att avgasema leds genom expansionskammaren (15) i en krökt bana. . Anordning enligt krav 6, kännetecknad av att expansionskammaren (15) är S- formad.1 '523 132 4 Patent claims. Device for sound and / or thermal insulation of exhaust emissions on portable combustion engine-powered tools, such as leaf blowers, trimmers or the like, with a sound-insulating housing (10) around the engine (11) or other sound-generating parts, characterized in that the exhaust gases are led out of the housing (10) via an expansion chamber (15) made of a heat-insulating material integrated in the housing (10). . Device according to claim 1, characterized in that the expansion chamber (15) is made of a ceramic material. . Device according to Claim 1 or 2, characterized in that the expansion chamber (15) is made of a material with sound-insulating properties. . Device according to one of the preceding claims, characterized in that the inlet duct (17) of the expansion chamber (15) is larger than the outlet pipe (16) of the muffler (12) so that air from the inside of the housing (10) is sucked into the expansion chamber (15) and mixed with the exhaust gases in the expansion chamber (15). . Device according to claim 4 ', characterized in that the outlet pipe (16) is surrounded by a washer (19) for controlling the size of the opening to the inlet duct (17). . Device according to one of the preceding claims, characterized in that the exhaust gases are passed through the expansion chamber (15) in a curved path. . Device according to Claim 6, characterized in that the expansion chamber (15) is S-shaped.
SE0100498A 2001-02-15 2001-02-15 Device for sound and thermal insulation of exhaust emissions on portable power tools SE523132C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE0100498A SE523132C2 (en) 2001-02-15 2001-02-15 Device for sound and thermal insulation of exhaust emissions on portable power tools
PCT/SE2002/000242 WO2002064956A1 (en) 2001-02-15 2002-02-12 Device for noise and temperature insulation of an exhaust gas outlet on a portable engine powered tool
US10/257,606 US20030154950A1 (en) 2001-02-15 2002-02-12 Device for noise and temperature insulation of an exhaust gas outlet on a portable engine powered tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE0100498A SE523132C2 (en) 2001-02-15 2001-02-15 Device for sound and thermal insulation of exhaust emissions on portable power tools

Publications (3)

Publication Number Publication Date
SE0100498D0 SE0100498D0 (en) 2001-02-15
SE0100498L SE0100498L (en) 2002-08-16
SE523132C2 true SE523132C2 (en) 2004-03-30

Family

ID=20282988

Family Applications (1)

Application Number Title Priority Date Filing Date
SE0100498A SE523132C2 (en) 2001-02-15 2001-02-15 Device for sound and thermal insulation of exhaust emissions on portable power tools

Country Status (2)

Country Link
SE (1) SE523132C2 (en)
WO (1) WO2002064956A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE525066C2 (en) * 2003-04-16 2004-11-23 Volvo Constr Equip Holding Se Method of ventilating a working machine, and such a working machine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS552178Y2 (en) * 1975-03-13 1980-01-21
JP2730738B2 (en) * 1987-12-08 1998-03-25 アンドレアス シュティール Exhaust silencer for two-cycle engine
JPH048715U (en) * 1990-05-09 1992-01-27
US5421154A (en) * 1992-07-23 1995-06-06 Pfefferle; William C. Exhaust temperature control

Also Published As

Publication number Publication date
WO2002064956A1 (en) 2002-08-22
SE0100498L (en) 2002-08-16
SE0100498D0 (en) 2001-02-15

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