WO2002064956A1 - Device for noise and temperature insulation of an exhaust gas outlet on a portable engine powered tool - Google Patents
Device for noise and temperature insulation of an exhaust gas outlet on a portable engine powered tool Download PDFInfo
- Publication number
- WO2002064956A1 WO2002064956A1 PCT/SE2002/000242 SE0200242W WO02064956A1 WO 2002064956 A1 WO2002064956 A1 WO 2002064956A1 SE 0200242 W SE0200242 W SE 0200242W WO 02064956 A1 WO02064956 A1 WO 02064956A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- expansion chamber
- exhaust gas
- cover
- noise
- engine
- Prior art date
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
Definitions
- Portable tools driven by a combustion engine are widely and increasingly used for different kind of work in the countryside in order to facilitate and make the work more efficient.
- tools for this kind of work for example hedge trimmers and leaf blowers.
- One thing these combustion engine driven tools have in common is that they generate a high level of noise that will affect both human beings and animals in the surrounding area in a negative way.
- the noise that is generated from the tool is also one important parameter that effects the working condition for the operator that is exposed to the noise during use of the tool.
- the noise generated from this kind of tools spring form different sources in the tool.
- a leaf blower is a big part of the total amount of noise related to the engine-powered fan and of course from the engine.
- Other types of tools may have other components that generate a high level of noise. In all engine-powered tools does the engine cause a not negligible amount of the generated noise.
- One solution in order to reduce the noise from the tool is to provide the engine and the other noise generating components with a cover that insulates the noise from spreading to the environment.
- This type of cover must be made of a material suitable for noise insulation and also light so that the weight of the tool could be kept low and the use of the tool easy for the operator.
- These types of covers are normally made of some sort of plastic material that has a low weight and is easy make in the desired shape in order to fit the tool. Unfortunately are plastic materials normally very sensitive to high temperatures and could therefore be damaged by the high temperature exhaust gas.
- the exhaust gas from the combustion engine has a high temperature when they leave the engine and must solely be lead out though the cover without melting or damaging the cover.
- the exhaust gases must also be lead out through the cover without reducing the insulating of the noise generated by the engine and other components located inside the cover.
- an expansion chamber integrated in the cover.
- the expansion chamber could be placed differently in the cover depending on type of tool and where the components inside the cover are placed.
- the expansion chamber is made of a suitable material that has good insulating features for high temperatures so that the cover not will be damaged by the exhaust gases.
- the material in the expansion chamber must also have a feature that makes the expansion chamber efficient in the insulation of noise.
- the expansion chamber is shaped so that the exhaust gas will pass through a curved chamber that will stop the sound waves from passing out through the expansion chamber together with the exhaust gas.
- the inlet of the expansion chamber is shaped so that the inlet is wider than the exhaust pipe from the engine/muffler.
- the exhaust pipe from the engine/muffler in put in the inlet of the expansion chamber. This means that there is a small space between the outside surface of the exhaust pipe and the edges of the inlet in the expansion chamber.
- Figure 1 Illustrates a vertical cross section through a first embodiment of the invention where exhaust gas is lead through cover by an expansion chamber.
- Figure 2 Illustrates a vertical cross section through a second embodiment of the claimed invention.
- a portable leaf blower carried on the back of the operator according to the invention includes an engine 11, a muffler 12 and a fan 13 all placed inside a noise insulating cover 10.
- the cover 10 that also is the chassis for an non- illustrated device for the carrying of the tool is provided with an air inlet 14 placed on the side of the tool that is turned towards the back of the operator during normal use.
- the cover 10 comprises the expansion chamber 15 that is placed so that an exhaust pipe 16 from the muffler 12 is located in an inlet 17 to the expansion chamber 15.
- the cross section of the inlet 17 has a bigger area than the cross section of the exhaust pipe 16 so that there is a distance between the edge of the inlet 17 and the surface of the exhaust pipe 16. This distance results in that air from the inside of the cover 11 will be sucked into the expansion chamber 15 where it will be mixed with the exhaust gas from the muffler 12.
- the mixture of air from the inside of the cover 11 and the exhaust gas from the muffler 12 will then leave the expansion chamber 15 via an outlet 18.
- the expansion chamber 15 is preferably made of a ceramic material that provides good insulation to both high temperatures and noise while the cover 11 preferably is made of a plastic material.
- the expansion chamber 15 is S-shaped to stop the sound waves from passing through the expansion chamber 15 and continue out into the environment.
- the exhaust pipe 16 from the muffler 12 preferably provided with a plate 19 that at least partially covers the inlet 17 to the expansion chamber 15.
- the plate 19 is used in order to crate a force into the expansion chamber 15 that exceeds the negative pressure inside the cover 11 to prevent the exhaust gas from the muffler 12 to be sucked inside the cover 11 instead of into the expansion chamber 15 and continue out to the environment.
- the plate 19 is preferably placed so that it not is in contact with the surface of the inlet 17 to the expansion chamber 15 to reduce the amount of vibrations and heat that is transferred from the exhaust pipe 16 and the plate 19 to the expansion chamber 15 and the cover 11.
- the size and exact position of the plate 19 in relation to the inlet 17 of the expansion chamber 15 is selected so that the space between the plate 19 and the inlet 17 gives a force of enough strength into the expansion chamber 15. Air is then sucked from the inside of the cover 11 into the expansion chamber 15.
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
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0100498-5 | 2001-02-15 | ||
SE0100498A SE523132C2 (en) | 2001-02-15 | 2001-02-15 | Device for sound and thermal insulation of exhaust emissions on portable power tools |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002064956A1 true WO2002064956A1 (en) | 2002-08-22 |
Family
ID=20282988
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
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 |
Country Status (2)
Country | Link |
---|---|
SE (1) | SE523132C2 (en) |
WO (1) | WO2002064956A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004091958A1 (en) * | 2003-04-16 | 2004-10-28 | Volvo Construction Equipment Holding Sweden Ab | Method for ventilating a working machine and such a working machine |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4060985A (en) * | 1975-03-13 | 1977-12-06 | Yanmar Diesel Engine Co., Ltd. | Exhaust system of an internal combustion engine |
US4867270A (en) * | 1987-12-08 | 1989-09-19 | Andreas Stihl | Exhaust gas muffler for a two-stroke engine |
US5080048A (en) * | 1990-05-09 | 1992-01-14 | Kioritz Corporation | Power blower |
US5421154A (en) * | 1992-07-23 | 1995-06-06 | Pfefferle; William C. | Exhaust temperature control |
-
2001
- 2001-02-15 SE SE0100498A patent/SE523132C2/en not_active IP Right Cessation
-
2002
- 2002-02-12 WO PCT/SE2002/000242 patent/WO2002064956A1/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4060985A (en) * | 1975-03-13 | 1977-12-06 | Yanmar Diesel Engine Co., Ltd. | Exhaust system of an internal combustion engine |
US4867270A (en) * | 1987-12-08 | 1989-09-19 | Andreas Stihl | Exhaust gas muffler for a two-stroke engine |
US5080048A (en) * | 1990-05-09 | 1992-01-14 | Kioritz Corporation | Power blower |
US5421154A (en) * | 1992-07-23 | 1995-06-06 | Pfefferle; William C. | Exhaust temperature control |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004091958A1 (en) * | 2003-04-16 | 2004-10-28 | Volvo Construction Equipment Holding Sweden Ab | Method for ventilating a working machine and such a working machine |
US7207172B2 (en) | 2003-04-16 | 2007-04-24 | Volvo Construction Equipment Holding Sweden Ab | Method for ventilating a working machine, and such a working machine |
Also Published As
Publication number | Publication date |
---|---|
SE523132C2 (en) | 2004-03-30 |
SE0100498L (en) | 2002-08-16 |
SE0100498D0 (en) | 2001-02-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4060985A (en) | Exhaust system of an internal combustion engine | |
CA2517743A1 (en) | Blower and method of conveying fluids | |
US7726443B2 (en) | Muffler and working machine | |
CA1102564A (en) | Engine drive type generator blower | |
US5199389A (en) | Work apparatus having an air-cooled internal combustion engine | |
EP0950802A3 (en) | Engine operated working machine | |
US5533869A (en) | Power tool exhaust cooling system | |
AU2002349744A1 (en) | A cooling and silencing device for processing the exhaust gas from an internal combustion engine | |
US6324721B2 (en) | Leaf blower | |
DE69819763D1 (en) | PORTABLE GAS BURNER | |
US20030154950A1 (en) | Device for noise and temperature insulation of an exhaust gas outlet on a portable engine powered tool | |
WO2002064956A1 (en) | Device for noise and temperature insulation of an exhaust gas outlet on a portable engine powered tool | |
CA1297414C (en) | Silencer | |
WO2002053912A3 (en) | Cooling air arrangement for compressor | |
CA1270163C (en) | Arrangement for controlling the intake air for the carburetor of a hand-held portable tool | |
SE9904573D0 (en) | Exhaust silencer | |
SE0100680D0 (en) | Device for winter adaptation of an internal combustion engine powered hand tool | |
US7380637B2 (en) | Exhaust-gas muffler | |
SE9500523L (en) | Silencer | |
JP3143728B2 (en) | Gas turbine engine enclosure device | |
EP2204557B1 (en) | A device for evacuating exhaust gases from an internal combustion engine for portable work tools | |
EP0771391B1 (en) | Muffler with catalytic converter | |
EP1531308B8 (en) | Silencer for a ventilation duct | |
RU95114315A (en) | DEVICE FOR STARTING A GAS TURBINE ENGINE | |
JPS6333096Y2 (en) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SD SE SG SI SK SL TJ TM TN TR TT TZ UA UG US UZ VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 10257606 Country of ref document: US |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
122 | Ep: pct application non-entry in european phase | ||
NENP | Non-entry into the national phase |
Ref country code: JP |
|
WWW | Wipo information: withdrawn in national office |
Country of ref document: JP |