1 EP 3 990 759 B1 2 Description after-treatment systems of combustion engines, while differentiating itself from existing end-out service filter de- FIELD OF THE INVENTION vices. The result is an end-out service filter device that meets the functionality requirements, but is also easy to [0001] Removing, cleaning and replacing filters in 5 manufacture and can be scaled to fit any filter or substrate boxed after-treatment systems can either be done side- size. The arrangement of the end-out service filter device out, i.e. radially to the filter flow axis, or end-out, i.e. axially object of the present invention, although being especially to the filter flow axis. In particular, the present invention suitable for particulate filters, in particular Diesel Partic- relates to an end-out service filter device for an exhaust ulate Filters (DPF) or Gasoline Particulate Filters (GPF), after-treatment system of a combustion engine. 10 can also be used for any substrate (Diesel Oxidation Cat- alyst (DOC), Selective Catalytic Reduction (SCR), BACKGROUND OF THE INVENTION Three-Way Catalyst (TWC), etc.). [0006] The present invention concerns a new end-out [0002] The acceptable limits for exhaust emissions of service filter device which can be part of the exhaust after- vehicles are being reduced and thus, the introduction of 15 treatment system of a vehicle. In the after-treatment sys- filter elements or similar in the exhaust line of vehicles is tem exhaust gas containing particulate matter out of a necessary in order to meet the emissions regulations. combustion engine typically passes through an oxidation Among other exhaust gas cleaning and filtering devices, catalyst and is then filtered through a particulate filter, the use of particulate filters, which reduce the particulate typically a Diesel Particulate Filter (DPF) or a Gasoline matter contained in the exhaust gases of a combustion 20 Particulate Filter (GPF). The particulate matter filtered engine, is increasing. Particulate matter accumulates by the particulate filter accumulates inside the filter unit. within the filter over time, and therefore the filter may Accumulated particulate matter typically comprises ash need to be serviced or even replaced with a new one. and soot. Soot usually accumulates within the filter walls Therefore it is important to provide a service filter device and can be burned out, whereas ash usually accumulates for an exhaust after-treatment system of a combustion 25 inside the filter channels and must be blown out. Blow engine which can be easily serviced while minimizing out of ash requires blowing gas through the filter’s outlet physical space requirements, flow path obstructions, risk side. Therefore, usually the filter must be removed from of bypass of the particulate matter and keeping a good the after-treatment system. The end-out service filter de- integrity of the insulation and good leak tightness. Serv- vice of the present invention allows for an easy and icing an end-out filter usually requires exposure of the 30 speedy removal of the filter from the after-treatment sys- internal parts of the filter device. The present invention tem, while keeping good leak tightness. allows for end-out service of the filter device while taking [0007] It is the object of the present invention to provide all of the aforementioned concerns into careful consid- an end-out service filter device for an exhaust after-treat- eration. ment system according to claim 1. [0003] Several inventions have been proposed to pro- 35 [0008] In an embodiment the lid fixing means comprise vide a service filter device that takes into account all of a V-clamp. Preferably the lid fixing means further com- the above. EP 2233708 A1 discloses an exhaust gas- prise a gasket. treating device for an exhaust system of an internal com- [0009] In a still further embodiment the filter unit fixing bustion engine, especially of a motor vehicle. Said ex- means comprise a V-clamp. Preferably the filter unit fix- haust gas-treating device has a housing, which has a 40 ing means further comprise a gasket. jacket extending circumferentially on the side and two [0010] In a still further embodiment the end-out service end-side end bottoms. Maintenance is simplified with at filter device further comprises an end baffle. least one mounting tube, which passes through one or [0011] In a still further embodiment the service opening the first end bottom and into the outlet end of which a is defined by a flange of the end baffle. Alternatively the particle filter is plugged axially from the outside, with a 45 service opening is defined by a flange of the flow transfer deflecting housing. The deflecting housing contains a de- device. flecting chamber, and has at least one inlet communicat- [0012] In a still further embodiment the service lid is ing with the deflecting chamber and at least one outlet coaxial with the filter unit. communicating with the deflecting chamber. A fastening [0013] In a still further embodiment the service lid com- device is provided for detachably fastening the respective 50 prises insulation. inlet at the respective outlet end of the mounting tube. [0014] In a still further embodiment the service lid com- [0004] Publication WO2014/008930A1 discloses an- prises a wall that is arranged such that it deflects the other exhaust system with a removable filter. exhaust gases of the combustion engine. Preferably, said wall of the service lid is arranged such that it deflects the SUMMARY OF THE INVENTION 55 exhaust gases exiting the filter unit. Alternatively, said wall of the service lid is arranged such that it deflects the [0005] The present invention solves many of the prob- exhaust gases towards the filter unit. lems with the prior art end-out service filter devices for [0015] In a still further embodiment the end-out service 2
Download PDF file