DEVICE FOR THE INJECTION OF GASES INTO THE FEED SYSTEM OF AN INTERNAL COMBUSTION ENGINE

• US 3,680,534 A
• Filed: 03/30/1970
• Issued: 08/01/1972
• Est. Priority Date: 03/30/1970
• Status: Expired due to Term

• Current Assignee: Claude Chavant
• Original Assignee: Claude Chavant
• Inventors: Chavant, Claude
• Primary Examiner(s): Burns, Wendell E.
• Application Number:
  US05/023,835
• Time in Patent Office: 855 Days
• Field of Search: 123/119A
• US Class Current: 123/568.17
• CPC Class Codes: F02M 26/19 Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system

Abstract

A device for the injection of secondary gases into the conduit for the intake of the gaseous fuel mixture of an internal combustion engine, comprising a nozzle mounted in said conduit the upstream mouth of which joins the said conduit in which it fits, and the downstream mouth of which is located in the said conduit with a certain clearance, forming a free annular space between said nozzle and said conduit, and duct for the supply of the said secondary gases, opening into said annular space, and communicating with a supply source of said secondary gases.

Claims

1. In an internal combustion engine, an elongated conduit for directing a fuel-air mixture from a carburetter to an intake of the engine, an elongated tube of Venturi-shaped configuration coaxially situated within said conduit and having an upstream inlet end and a downstream outlet end, said tube having a substantially uniform wall thickness and being fixed only at its upstream inlet end to the inner surface of said conduit along the entire peripheral edge of said tube at said upstream inlet end thereof so that the mixture is directed by said conduit through said tube, the latter defining at its downstream outlet end a relatively narrow gap with the interior surface of said conduit and said tube also defining with the interior surface of said conduit an elongated annular space which has a maximum width at an intermediate zone of said space surrounding a throat region of said tube with said space gradually diminishing in width from said intermediate zone in the upstream and downstream directions respectively toward said inlet end of said tube and said gap, said space being closed at said inlet end of said tube so that it communicates with the interior of said conduit only through said gap, and supply means communicating trough said conduit With said space and having an outlet occupying a given distance axially of said conduit opening into the intermediate zone of said space for supplying exhaust gases thereto, said space extending upstream of said outlet through a substantial distance which is substantially greater than said given distance as well as dOwnstream of said outlet also through a substantial distance which is substantially greater than said given distance, so that exhaust gases supplied to said space by said supply means can expand in an upstream direction toward said inlet end of said tube in the interior of said space and flow in a downstream direction from said intermediate zone through said gap into contact with the mixture issuing through the downstream outlet end of said tube.

2. The combination of claim 1 and wherein said supply means includes at least one additional conduit communicating through an opening of said first-named conduit with said intermediate zone.

3. The combination of claim 2 and wherein said one additional conduit extends non-radially with respect to the common axis of said tube and first-named conduit so that the exhaust gases introduced through said supply means have a swirling motion in said space.

4. The combination of claim 3 and wherein there are a pair of said additional conduits respectively communicating with said intermediate zone of said space at diametrically opposed portions of said first-named conduit.

5. The combination of claim 1 and wherein a throttle valve is situated in said conduit downstream of and adjacent to the outlet end of said tube.

6. The combination of claim 1 and wherein said supply means includes a pair of diametrically opposed supply conduits extending along a straight line perpendicular to the common axis of said tube and first-named conduit and communicating through diametrically opposed openings of the latter with said intermediate zone.

7. The combination of claim 1 and wherein said supply means is situated substantially midway between opposed ends of said space.