Insert, holder and post-treatment unit for exhaust gases
a post-treatment unit and exhaust gas technology, which is applied in the direction of machines/engines, separation processes, filtration separation, etc., can solve the problems that the emission requirements often do not allow even an occasional percentage of exhaust gases, and achieve the effect of effective sealing and easy removal and re-positioning
Inactive Publication Date: 2013-10-31
SCANIA CV AB
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- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The invention is a sealing mechanism that allows for easy removal and replacement of an insert without needing to replace the seal. The sealing mechanism has a great sealing performance and can be re-used multiple times. The connection holding the insert in place is easy to achieve and ensures good abutment force between the sealing rings. The threaded connection makes it easy to insert the insert into the holder in a single operation.
Problems solved by technology
After each extraction, such a seal needs to be replaced by a new seal, since it will have become plastically deformed and will no longer be tight enough when the insert is reconnected to the holder for the post-treatment unit to be able to meet the prevailing requirements with regard to exhaust emissions.
Today's emission requirements often do not allow even an occasional percentage of the exhaust gases to leak past the inserts in the post-treatment unit.
Method used
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Embodiment Construction
[0021]FIG. 1 depicts an exhaust post-treatment unit 10 for an undepicted combustion engine, e.g. a diesel engine of, for example, a freight vehicle. The post-treatment unit 10 comprises in a known way a housing 12 with inlet and outlet apertures not depicted in detail for the exhaust gases from the engine. The unit 10 may have one or more interchangeable inserts, e.g. the insert 50 represented by a broken line in FIG. 1, each comprising a treatment component containing a substrate arranged to have the exhaust gases flowing through it, e.g. an oxidation catalyst, an SCR catalyst or a wall flow filter.
[0022]As illustrated in FIG. 2, the insert 50 has a thin-walled sleeve 52 or so-called “sleeving pipe”, which is open at both ends and into which the substrate 70 is pushed and is then axially fixed by a pair of mutually opposite locking rings 72 which are themselves fixed by annular shoulders 74 formed at the mutually opposite ends of the sleeve 52. The substrate 70 may also have radial...
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Abstract
An insert (50) for a holder (22) in a post-treatment unit (10) for exhaust gases of a combustion engine, has a socket (52) for a treatment component (70) intended to have flowing through it the exhaust gases which are to be treated, a connector (54) for holding the insert (50) in position in the holder (22), and a seal (82) for gastight closure of the socket (52) relative to the holder (22). The seal includes a sealing ring (82) on the socket (52) for cooperation in self-centering seat engagement with an opposite sealing ring (84) in the holder.
Description
TECHNICAL FIELD[0001]The invention relates to an insert for a holder in a post-treatment unit for exhaust gases of a combustion engine, comprising a socket for a treatment component intended to have flowing through it the exhaust gases which are to be treated, connecting means for holding the insert in position in the holder, and sealing means for gastight closure of the socket relative to the holder. The invention relates also to a holder for such an insert and a post-treatment unit provided with such an insert.BACKGROUND[0002]To meet increasingly stringent emission requirements, vehicle manufacturers have long resorted to exhaust post-treatment. This treatment is performed in various catalysts and filters which transform the exhaust gases chemically or physically so that only a small amount of the undesirable substances can escape from the exhaust pipe. In an insert of the kind indicated above the treatment component may be, for example, an oxidation catalyst, an SCR (selective ca...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F01N3/00
CPCF01N3/00F01N3/0211F01N3/2867F01N3/2875F01N3/2878F01N2450/16Y02A50/20Y02T10/12F01N3/02F01N3/021F01N3/28F01N13/18F01N13/1827F01N2450/30B01D27/08B01D35/306
Inventor BUCKSCH, RAGNARQVIST, GORAN
Owner SCANIA CV AB