Cleanable device for depolluting an engine exhaust gases

• US 20040109795A1
• Filed: 01/12/2004
• Published: 06/10/2004
• Est. Priority Date: 02/21/2001
• Status: Abandoned Application

• Current Assignee: Faurecia Systemes D'Echappement (Faurecia SA)
• Original Assignee: Faurecia Systemes D'Echappement (Faurecia SA)
• Inventors: Marc, Bertrand
• Application Number:
  US10/468,449
• Publication Number:
  US 20040109795A1
• Time in Patent Office: Days
• US Class Current: 422/177
• CPC Class Codes: F01N 13/0097 the purifying devices are arranged in a single housing
• CPC Class Codes: F01N 13/1805 Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body pipe joints in general F16L; fixing auxiliaries in motor vehicles in general B60K
• CPC Class Codes: F01N 13/1894 the parts being assembled in longitudinal direction
• CPC Class Codes: F01N 3/023 using means for regenerating the filters, e.g. by burning trapped particles by electrically controlling the supply of combustible mixture or its constituents only F02D41/0235
• CPC Class Codes: F01N 3/0233 periodically cleaning filter by blowing a gas through the filter in a direction opposite to exhaust flow, e.g. exposing filter to engine air intake
• CPC Class Codes: F01N 3/0237 for regenerating ex situ
• CPC Class Codes: F01N 3/035 with catalytic reactors , e.g. catalysed diesel particulate filters

Abstract

A device for depolluting a heat engine exhaust gases includes an outer casing (23) defining a passage for the circulation of exhaust gases and, mounted in series in the passage, a catalytic purifying member (18) and a particulate filter (20). The casing (23) includes a transverse break (34) along its entire periphery, which break (34) divides the casing (23) into successive sections (38, 40), the device including a detachable device (36) connecting two successive sections along the break. The detachable connecting device (36) extends in a plane transverse to the gas circulation passage and passes through either the catalytic purifying member (18) or the particulate filter (20).

Claims

1. Device for depollution of the exhaust gases from a heat engine comprising an outer casing (23) delimiting a passage for circulation of the exhaust gases and, mounted in series in the said passage, a catalytic purification unit (18) and a particulate filter (20), the device comprising means for access to the upstream surface of the particulate filter, these access means comprising a transverse break (34) in the casing along its entire periphery, which break (34) separates the casing (23) into successive sections (38, 40), the device further comprising detachable means (36) for connection of the two successive sections along the said break, characterised in that the said detachable connection means (36) extend in a plane extending transversely with respect to the circulation passage and passing through one of the catalytic purification device (18) and of the particulate filter (20).

2. Device as claimed in claim 1, characterised in that the two successive sections (38, 40) have ends which are engaged in one another and overlap along a part of the length of the circulation passage.

3. Device as claimed in claim 2, characterised in that the end of the upstream section (38), viewed in the normal direction of flow in the circulation passage, extends inside the end of the downstream section (40) when viewed in the normal direction of flow in the circulation passage.

4. Device as claimed in any one of the preceding claims, characterised in that the said detachable connection means (36) extend around the said catalytic purification unit (18).

5. Device as claimed in any one of the preceding claims, characterised in that the two associated ends of two successive sections (38, 40) have complementary profiles in the shape of truncated cones for centring (72, 74).

6. Device as claimed in any one of the preceding claims, characterised in that the said detachable connection means (36) have a peripheral flange (42, 44;

80;

104) integral with each section (38, 40) and a strap (46) encircling the two flanges (42, 44;

80;

104) and ensuring axial clamping of the flanges against one another.

7. Device as claimed in claim 6, characterised in that at least one (42) of the peripheral flanges is formed by deformation of the section of casing (40).

8. Device as claimed in claim 6 or 7, characterised in that at least one of the peripheral flanges has an attached ring (48;

80;

104) around the said associated section of casing (38).

9. Device as claimed in any one of claims 6 to 8, characterised in that it has an O ring (54;

86) interposed between the two flanges (42, 44;

80).

10. Device as claimed in any one of claims 6 to 9, characterised in that the said strap (46) has at least one profile (92) delimiting a channel inside which the two flanges and a clamping collar (90) surrounding the or each profile (82) are gripped.

11. Device as claimed in claim 2 or 3 and any one of claims 2 to 10, characterised in that one of the flanges (44;

80;

104) extends at a distance from the end of the associated section of casing (38) along the length of the passage for flow of the exhaust gases.