EP0457287A2 - An anti-pollution device for treating the exhaust gases from internal combustion engines and burners in general, functioning also as exhaust silencer - Google Patents

An anti-pollution device for treating the exhaust gases from internal combustion engines and burners in general, functioning also as exhaust silencer Download PDF

Info

Publication number
EP0457287A2
EP0457287A2 EP91107823A EP91107823A EP0457287A2 EP 0457287 A2 EP0457287 A2 EP 0457287A2 EP 91107823 A EP91107823 A EP 91107823A EP 91107823 A EP91107823 A EP 91107823A EP 0457287 A2 EP0457287 A2 EP 0457287A2
Authority
EP
European Patent Office
Prior art keywords
walls
facing surfaces
spiral duct
inward facing
duct
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.)
Granted
Application number
EP91107823A
Other languages
German (de)
French (fr)
Other versions
EP0457287A3 (en
EP0457287B1 (en
Inventor
Guiseppe Nieri
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.)
NIERI, GIUSEPPE
Original Assignee
Guiseppe Nieri
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 Guiseppe Nieri filed Critical Guiseppe Nieri
Publication of EP0457287A2 publication Critical patent/EP0457287A2/en
Publication of EP0457287A3 publication Critical patent/EP0457287A3/en
Application granted granted Critical
Publication of EP0457287B1 publication Critical patent/EP0457287B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/12—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels
    • 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
    • F01N1/12—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels
    • F01N1/125—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2807—Metal other than sintered metal
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2825—Ceramics
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • F01N3/2885—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification 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
    • F01N2230/00—Combination of silencers and other devices
    • F01N2230/04—Catalytic converters

Definitions

  • the present invention relates to an anti-pollution device for the treatment of exhaust gases from internal combustion engines and burners generally, which also performs the function of a silencer, i.e. a device for incorporation into the pipeline through which fumes generated by the combustion of fuel are exhausted from internal combustion engines or from the combustion chambers of burners, to the end of controlling or eliminating harmful emissions (CO, HC, NOx and particulate matter), and at the same time of reducing exhaust noise levels.
  • a silencer i.e. a device for incorporation into the pipeline through which fumes generated by the combustion of fuel are exhausted from internal combustion engines or from the combustion chambers of burners, to the end of controlling or eliminating harmful emissions (CO, HC, NOx and particulate matter), and at the same time of reducing exhaust noise levels.
  • the prior art embraces devices for the control of exhaust emissions, utilizing catalytic converters in which gases are brought into contact with porous surfaces containing catalytic elements such as platinum, palladium and rhodium, able to promote the oxidation of carbon monoxide and hydrocarbons that have escaped combustion, and the reduction of oxides of nitrogen.
  • Such devices have little or no ability to damp sound waves however, and must be used in conjunction with a conventional silencer if lower exhaust noise levels are be achieved.
  • the art further embraces exhaust silencer devices as disclosed in US 4579195, IT 1195502, IT 1189816, IT 199088, IT 199262, IT 206501 and IT 207680, in the name of the present applicant, wherein the flow of hot gases is directed entirely or partly into a flat spiral duct or channel of constant or variable pitch, thence into an exhaust chamber connecting with a tail pipe or directly into one or more tail pipes; sound waves carried by the gases are damped principally by collision with the internal surfaces of the spiral duct, and with those of the exhaust chamber or of the inlets to the tail pipes.
  • None of the devices reflecting the current state of the art is capable of performing the dual function of controlling emissions in exhaust gases from an internal combustion engine or a burner and damping the sound waves carried in such gases.
  • the prior art thus stands in need of improvement, with the end in view of uniting two functions - viz, of eliminating pollutants from the exhaust gases generated by internal combustion engines and by burners, and of damping the sound waves carried by such gases, in a single device.
  • the object of the present invention is to provide a device capable of lowering harmful emissions in the exhaust gases produced by internal combustion engines or burners, and of bringing about a notable reduction in exhaust noise levels at one and the same time.
  • the stated object is realized in a device through which to direct the flow of exhaust gases from an internal combustion engine or burner, consisting essentially in a duct created between the coils of a flat spiral element open at one or both ends and fashioned in material having a low coefficient of thermal conductivity, such as a ceramic, or sheet metal with a suitably treated surface, for example coated with a layer of aluminium oxide (A1203); advantageously, the surfaces of the spiral element exposed to the gases can be coated with catalytic materials such as platinum, palladium or rhodium, able to promote the oxidation or reduction of pollutants in the exhaust gases.
  • catalytic materials such as platinum, palladium or rhodium
  • the surface of the spiral coils of material exposed to the hot gases is undulated, or embodied with projections of sawtooth profile, so as to trap and thus favour the combustion of such particulate matter.
  • the advantages of the present invention are: the facility of utilizing a single device to control emissions in and reduce the noise level of exhaust gases; simplicity in construction; marked reduction in manufacturing costs; greater efficiency.
  • 1 denotes a pipe through which exhaust gases are directed into the device
  • a and B denote the longitudinal axis of the pipe and of the device, respectively
  • 2 denotes a cover fitted to the front end of the device, i.e. the inlet end
  • 3 denotes a spiral duct of which the walls 4 are created by the single coils of an element fashioned from metal coated with a material of low thermal conductivity and receding spirally from the axis B of the device.
  • 4' denotes the same spirally coiled walls of an element fashioned in ceramic material such as cordierite.
  • FIG. 6 denotes the outermost coil of the spiral element, which provides the external casing of the device in the event that the walls 4 are fashioned in metal with a coating of low thermal conductivity (fig 1); 7 denotes the outer casing of a device in which the walls 4' of the spiral element are ceramic (fig 3).
  • 10 denotes a central baffle partly enclosing the rear end of the spiral duct 3, which consists in a circular dish pressed from the rear cover 11 of the device; 12 denotes a void between the rear cover 11 and the turns of the duct 3 not enclosed by the battle 10, which may be filled with sound-absorbent or sound-reflecting material.
  • the embodiment of fig 3 further comprises a layer of insulating material 14 sandwiched between the outermost coil 6 of the spiral element and the casing 7; also, the surface of each coil or wall 4' affords a plurality of projections 15 exhibiting a sawtooth profile, which serve to trap particulate matter.
  • Hot combustion gases generated by fuel combustion in an engine, or a burner generally, characterized by a high content of pollutant emissions and sound pressure waves of high intensity, are directed from the exhaust pipe 1 into the spiral duct 3 by way of the hole 9 in the inlet ring 8.
  • the temperature of the walls 4 or 4' is raised to a level such as will promote further combustion of the pollutants present in the gases (CO, HC); further combustion in turn pushes the temperature of the walls 4 or 4' still higher, thereby enhancing the destruction process.
  • This further combustion of carbon monoxide and hydrocarbons can be rendered more advantageous yet by coating the walls 4 or 4' with a platinum or palladium based catalytic material.
  • Such a material might also be formulated with rhodium, to the end of catalyzing the reduction of nitrogen oxides.
  • the sawtooth projections 15 increase the ability of the device to trap any particulate matter on the surface of the walls 4 or 4', whereupon such matter will burn by reason of the high temperature of the coils.

Abstract

The device, which serves both to control harmful emissions and to lower the noise levels of exhaust gases from internal combustion engines and burners in general, comprises a duct (3) created between the coils (4, 4') of a spiral element and open at either one or both ends; the element is fashioned in a material of low thermal conductivity, and the coiled surfaces exposed to the exhaust gases can be coated with catalytic materials capable of speeding up the reduction or oxidation of pollutants.

Description

  • The present invention relates to an anti-pollution device for the treatment of exhaust gases from internal combustion engines and burners generally, which also performs the function of a silencer, i.e. a device for incorporation into the pipeline through which fumes generated by the combustion of fuel are exhausted from internal combustion engines or from the combustion chambers of burners, to the end of controlling or eliminating harmful emissions (CO, HC, NOx and particulate matter), and at the same time of reducing exhaust noise levels.
  • The prior art embraces devices for the control of exhaust emissions, utilizing catalytic converters in which gases are brought into contact with porous surfaces containing catalytic elements such as platinum, palladium and rhodium, able to promote the oxidation of carbon monoxide and hydrocarbons that have escaped combustion, and the reduction of oxides of nitrogen. Such devices have little or no ability to damp sound waves however, and must be used in conjunction with a conventional silencer if lower exhaust noise levels are be achieved.
  • The art further embraces exhaust silencer devices as disclosed in US 4579195, IT 1195502, IT 1189816, IT 199088, IT 199262, IT 206501 and IT 207680, in the name of the present applicant, wherein the flow of hot gases is directed entirely or partly into a flat spiral duct or channel of constant or variable pitch, thence into an exhaust chamber connecting with a tail pipe or directly into one or more tail pipes; sound waves carried by the gases are damped principally by collision with the internal surfaces of the spiral duct, and with those of the exhaust chamber or of the inlets to the tail pipes.
  • None of the devices reflecting the current state of the art is capable of performing the dual function of controlling emissions in exhaust gases from an internal combustion engine or a burner and damping the sound waves carried in such gases.
  • The prior art thus stands in need of improvement, with the end in view of uniting two functions - viz, of eliminating pollutants from the exhaust gases generated by internal combustion engines and by burners, and of damping the sound waves carried by such gases, in a single device.
  • Accordingly, the object of the present invention is to provide a device capable of lowering harmful emissions in the exhaust gases produced by internal combustion engines or burners, and of bringing about a notable reduction in exhaust noise levels at one and the same time.
  • The stated object is realized in a device through which to direct the flow of exhaust gases from an internal combustion engine or burner, consisting essentially in a duct created between the coils of a flat spiral element open at one or both ends and fashioned in material having a low coefficient of thermal conductivity, such as a ceramic, or sheet metal with a suitably treated surface, for example coated with a layer of aluminium oxide (A1203); advantageously, the surfaces of the spiral element exposed to the gases can be coated with catalytic materials such as platinum, palladium or rhodium, able to promote the oxidation or reduction of pollutants in the exhaust gases.
  • In the case of exhaust gases containing notable quantities of so-called particulate matter, i.e. the solid combustion residue as produced typically by Diesel engines, the surface of the spiral coils of material exposed to the hot gases is undulated, or embodied with projections of sawtooth profile, so as to trap and thus favour the combustion of such particulate matter.
  • The advantages of the present invention are: the facility of utilizing a single device to control emissions in and reduce the noise level of exhaust gases; simplicity in construction; marked reduction in manufacturing costs; greater efficiency.
  • Two embodiments of the prosent invention will now be described in detail, by way of example, with the aid of the accompanying drawings, in which:
    • fig 1 is a longitudinal section through a device according to the invention, in which the spiral element is fashioned in sheet metal with a suitably treated surface;
    • fig 2 is the section through II-II, fig 1;
    • fig 3 is a longitudinal section through a device according to the invention, in which the spiral element is fashioned in ceramic material;
    • fig 4 is the section through IV-IV, fig 3.
  • In the drawings, 1 denotes a pipe through which exhaust gases are directed into the device; A and B denote the longitudinal axis of the pipe and of the device, respectively; 2 denotes a cover fitted to the front end of the device, i.e. the inlet end; 3 denotes a spiral duct of which the walls 4 are created by the single coils of an element fashioned from metal coated with a material of low thermal conductivity and receding spirally from the axis B of the device.
  • 4' denotes the same spirally coiled walls of an element fashioned in ceramic material such as cordierite.
  • 5 denotes a void between the front cover 2 and the spirally coiled walls 4, which may be filled with 10 sound-absorbent or sound-reflecting material.
  • 6 denotes the outermost coil of the spiral element, which provides the external casing of the device in the event that the walls 4 are fashioned in metal with a coating of low thermal conductivity (fig 1); 7 denotes the outer casing of a device in which the walls 4' of the spiral element are ceramic (fig 3).
  • 8 denotes a ring enclosing the innermost turns of the spiral duct at the inlet end and affording a central hole 9 by which these same innermost turns are caused to communicate with the exhaust pipe 1.
  • 10 denotes a central baffle partly enclosing the rear end of the spiral duct 3, which consists in a circular dish pressed from the rear cover 11 of the device; 12 denotes a void between the rear cover 11 and the turns of the duct 3 not enclosed by the battle 10, which may be filled with sound-absorbent or sound-reflecting material.
  • 13 denotes a tail pipe associated with the device by insertion through the periphery of the rear cover 11 in such a way as to communicate with the outermost turns of the spiral duct 3; C denotes the axis of the pipe 13. The embodiment of fig 3 further comprises a layer of insulating material 14 sandwiched between the outermost coil 6 of the spiral element and the casing 7; also, the surface of each coil or wall 4' affords a plurality of projections 15 exhibiting a sawtooth profile, which serve to trap particulate matter.
  • Operation of the device will now be described.
  • Hot combustion gases generated by fuel combustion in an engine, or a burner generally, characterized by a high content of pollutant emissions and sound pressure waves of high intensity, are directed from the exhaust pipe 1 into the spiral duct 3 by way of the hole 9 in the inlet ring 8. The temperature of the walls 4 or 4', whether of metal with a coating of low thermal conductivity or of ceramic material, is raised to a level such as will promote further combustion of the pollutants present in the gases (CO, HC); further combustion in turn pushes the temperature of the walls 4 or 4' still higher, thereby enhancing the destruction process. This further combustion of carbon monoxide and hydrocarbons can be rendered more advantageous yet by coating the walls 4 or 4' with a platinum or palladium based catalytic material. Such a material might also be formulated with rhodium, to the end of catalyzing the reduction of nitrogen oxides.
  • The sawtooth projections 15 increase the ability of the device to trap any particulate matter on the surface of the walls 4 or 4', whereupon such matter will burn by reason of the high temperature of the coils.
  • In addition to the emission control thus obtained, sound pressure waves carried in the gases are also damped, principally by collision with the surfaces of the spiral duct and of the outlet to the tail pipe 13.

Claims (12)

  1. An anti-pollution device for the treatment of exhaust gases from internal combustion engines and burners in general, functioning also as a silencer, consisting in a spiral duct connected with at least one inlet pipe and at least one outlet pipe, characterized in that the walls of the duct are fashioned in material possessing a low coefficient of thermal conductivity.
  2. A device as in claim 1, wherein the walls of the spiral duct are fashioned in a ceramic material.
  3. A device as in claim 1, wherein the walls of the spiral duct are fashioned in metal coated with a material possessing low thermal conductivity.
  4. A device as in claim 1, wherein the inward facing surfaces of the walls of the spiral duct are coated with a catalytic material incorporating noble metals such as platinum, palladium and rhodium.
  5. A device as in claim 1, wherein the inward facing surfaces of the walls of the spiral duct exhibit projections of sawtooth profile.
  6. A device as in claim 1, wherein the inward facing surfaces and the outward facing surfaces of the walls of the spiral duct exhibit projections of sawtooth profile.
  7. A device as in claim 4, wherein the inward facing surfaces of the walls of the spiral duct exhibit projections of sawtooth profile.
  8. A device as in claim 4, wherein the inward facing surfaces and the outward facing surfaces of the walls of the spiral duct exhibit projections of sawtooth profile.
  9. A device as in claim 1, wherein the inward facing surfaces of the walls of the spiral duct are undulated.
  10. A device as in claim 1, wherein the inward facing surfaces and the outward facing surfaces of the walls of the spiral duct are undulated.
  11. A device as in claim 4, wherein the inward facing surfaces of the walls of the spiral duct are undulated.
  12. A device as in claim 4, wherein the inward facing surfaces and the outward facing surfaces of the walls of the spiral duct are undulated.
EP91107823A 1990-05-18 1991-05-15 An anti-pollution device for treating the exhaust gases from internal combustion engines and burners in general, functioning also as exhaust silencer Expired - Lifetime EP0457287B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT04008190A IT1245938B (en) 1990-05-18 1990-05-18 ANTI-POLLUTION DEVICE FOR EXHAUST GAS OF INTERNAL COMBUSTION ENGINES AND BURNERS IN GENERAL, ALSO HAVING THE FUNCTION OF EXHAUST SILENCER.
IT4008190 1990-05-18

Publications (3)

Publication Number Publication Date
EP0457287A2 true EP0457287A2 (en) 1991-11-21
EP0457287A3 EP0457287A3 (en) 1992-01-02
EP0457287B1 EP0457287B1 (en) 1998-01-07

Family

ID=11247779

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91107823A Expired - Lifetime EP0457287B1 (en) 1990-05-18 1991-05-15 An anti-pollution device for treating the exhaust gases from internal combustion engines and burners in general, functioning also as exhaust silencer

Country Status (3)

Country Link
EP (1) EP0457287B1 (en)
DE (1) DE69128558T2 (en)
IT (1) IT1245938B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0556846A1 (en) * 1992-02-19 1993-08-25 LEISTRITZ AG & CO. Abgastechnik Exhaust silencer for diesel engines, particularly for commercial vehicles

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191301332A (en) * 1913-01-16 1913-11-06 William Edward Lake Improvements in Silencers for Gas Engines and the like.
US2552615A (en) * 1948-05-29 1951-05-15 Lawrence F Baltzer Muffler with spiral conical insert
US3066755A (en) * 1960-04-21 1962-12-04 Diehl William Carl Muffler with spiral partition
US3927525A (en) * 1973-05-25 1975-12-23 Gen Motors Corp Engine with exhaust manifold converter-reactor
EP0044398A1 (en) * 1980-07-19 1982-01-27 KNECHT Filterwerke GmbH Exhaust filter for combustion engine
DE8912193U1 (en) * 1989-08-05 1989-11-30 Tomala, Michal, Katowice, Pl

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191301332A (en) * 1913-01-16 1913-11-06 William Edward Lake Improvements in Silencers for Gas Engines and the like.
US2552615A (en) * 1948-05-29 1951-05-15 Lawrence F Baltzer Muffler with spiral conical insert
US3066755A (en) * 1960-04-21 1962-12-04 Diehl William Carl Muffler with spiral partition
US3927525A (en) * 1973-05-25 1975-12-23 Gen Motors Corp Engine with exhaust manifold converter-reactor
EP0044398A1 (en) * 1980-07-19 1982-01-27 KNECHT Filterwerke GmbH Exhaust filter for combustion engine
DE8912193U1 (en) * 1989-08-05 1989-11-30 Tomala, Michal, Katowice, Pl

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0556846A1 (en) * 1992-02-19 1993-08-25 LEISTRITZ AG & CO. Abgastechnik Exhaust silencer for diesel engines, particularly for commercial vehicles

Also Published As

Publication number Publication date
DE69128558T2 (en) 1998-04-16
EP0457287A3 (en) 1992-01-02
IT9040081A1 (en) 1991-11-18
IT9040081A0 (en) 1990-05-18
EP0457287B1 (en) 1998-01-07
DE69128558D1 (en) 1998-02-12
IT1245938B (en) 1994-11-05

Similar Documents

Publication Publication Date Title
US6513324B2 (en) Device with heating element for exhaust gas cleaning
CA1262869A (en) Combined muffler and catalytic converter exhaust unit
EP0643799B1 (en) Muffler with catalytic converter arrangement
US5285640A (en) Integrated post-engine emissions heater, catalytic converter and muffler
US4400356A (en) Combustion catalyst bed
US11603784B2 (en) Exhaust system and features thereof
JP2617068B2 (en) Combined denitration and silencing equipment
EP0457287A2 (en) An anti-pollution device for treating the exhaust gases from internal combustion engines and burners in general, functioning also as exhaust silencer
JP3321763B2 (en) Engine exhaust gas treatment device
JP2678452B2 (en) Heat-resistant silencer used in combustion equipment
EP4048431A1 (en) Exhaust system and features thereof
US3966016A (en) Muffler converter
KR20030021130A (en) Auxiliary heating device with noise damper
AU2020369432B2 (en) Exhaust system and features thereof
RU97102938A (en) CATALYTIC EMISSION GAS OF INTERNAL COMBUSTION ENGINE
KR200286791Y1 (en) Tube Heater
KR100446906B1 (en) Tube Heater
CN114929365B (en) Exhaust system and features thereof
KR20100081733A (en) An exhaust gas reducing assembly for a vehicles which is possessed of duplex catalyst portion
JPH02154906A (en) Burning device
EA043639B1 (en) EXHAUST SYSTEM AND ITS COMPONENTS
RU97114497A (en) CATALYTIC EXHAUST GAS OF INTERNAL COMBUSTION ENGINE
JPH05312033A (en) High-temperature reactor
KR101020970B1 (en) catalytic converter structure for diesel engine
JPH02164419A (en) Waste gas purifying apparatus

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB IT

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19920629

17Q First examination report despatched

Effective date: 19930802

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: NIERI, GIUSEPPE

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 69128558

Country of ref document: DE

Date of ref document: 19980212

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: GARDI PATENT

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20031112

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20031113

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20031127

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040515

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041201

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20040515

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050131

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050515