Converter structure

• US 4,218,422 A
• Filed: 10/15/1976
• Issued: 08/19/1980
• Est. Priority Date: 10/15/1976
• Status: Expired due to Term

• Current Assignee: Ford Motor Company
• Original Assignee: Ford Motor Company
• Inventors: Schock, Donald N., Schwallbach, Hans G.
• Primary Examiner(s): Richman, Barry S.
• Application Number:
  US05/732,687
• Time in Patent Office: 1,404 Days
• Field of Search: 23/288 F, 23/288 FB, 23/288 FC, 23/277 C, 60/289, 60/299, 60/307, 422/172, 422/194, 422/171
• US Class Current: 422/171
• CPC Class Codes: F01N 13/0097 the purifying devices are arranged in a single housing
• CPC Class Codes: F01N 3/28 Construction of catalytic reactors
• CPC Class Codes: F01N 3/2853 using mats or gaskets between catalyst body and housing
• CPC Class Codes: F01N 3/34 using air conduits or jet air pumps, e.g. near the engine exhaust port
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

Device for adding secondary air to a converter structure including a converter housing with inlet and outlet structures attached to opposite ends thereof. A pair of catalyst containing beds are supported within the housing in spaced relationship. The improved device for introducing secondary air in the space between the spaced catalyst containing beds includes structure for forming a restricted throat between the spaced catalyst containing beds and structure forming an annular zone between the structure and the interior surface of the converter housing. The annular zone encircles the restricted throat and is connected thereto by a plurality of openings. A secondary air supply supplies air to the annular zone which can flow through the openings to the restricted throat.

Claims

1. In a catalytic converter for combustion product comprising a shell defining first and second longitudinally spaced apart shell portions, said shell having an interior wall, a first substrate containing a reducing catalyst, the first substrate disposed in the first shell portion, a second substrate containing an oxidizing catalyst, the second substrate disposed in the second shell portion, said shell further having an inlet for introducing combustion product into the first shell portion and an outlet for exhausting combustion product from the second shell portion, and a third passageway providing communication between the first and second shell portions, means for introducing air into the combustion product flowing longitudinally through the third passageway and means for providing access to the air introducing means through the shell, the improvement wherein the air introducing means comprises at least one channel section, the at least one channel section being formed to extend perimetrally substantially completely about the interior wall of the shell generally transversely to combustion product flow through the third passageway, the at least one channel section including upstream and downstream edge portions for engaging the interior wall of the shell and an intermediate portion extending between the upstream and downstream edge portions for defining between the channel section and the shell interior wall a manifold, said manifold including a plurality of apertures opening inwardly for directing a plurality of streams containing air from the manifold into the combustion product.

2. The improvement of claim 1 wherein the apertures direct air containing streams generally perpendicularly of the direction of combustion product flow in the third passageway.