Anti-reversion apparatus

Abstract

An anti-reversionary device for installation into the intake or the exhaust of an internal combustion engine comprises an inner pipe substantially centralized in the conduit. A plurality of ports are formed in an annular wall extending between the inner pipe and the conduit. Slower boundary layer gas flow adjacent the conduit is directed through the ports, and accelerated to join the faster gas flow passing through the inner pipe. The annular wall is angled downstream from the inner pipe to the conduit with the ports forming gas flow-directing passages angled radially inwardly. The inner pipe and annular wall are supported in a cylindrical housing forming a unitary body fit to the conduit. One or more devices can be installed in the conduit.

1 . An anti-reversionary device adapted to a conduit having a bore through which gas flow to or from an internal combustion engine, comprising: 
 an inner pipe positioned substantially concentrically and co-axially within the bore of the conduit; and    an annular wall extending to fit between the pipe and the conduit, the annular wall having a plurality of ports formed therein and about the inner pipe, each port forming a passage directed radially inward and downstream and wherein the inner pipe has a tubular gas inlet projecting upstream from the annular wall so that    the annular wall separates the gas flow into a annular gas flow and a central gas flow, the central gas flow being faster than the annular gas flow at the tubular gas inlet, and the annular gas flow accelerates through the plurality of passages for directed discharge into the central gas flow.    
     
     
         2 . The anti-reversionary device of  claim 1  wherein the conduit is an intake to an internal combustion engine.  
     
     
         3 . The anti-reversionary device of  claim 1  wherein the conduit is an exhaust from an internal combustion engine.  
     
     
         4 . The anti-reversionary device of  claim 3  wherein the anti-reversionary device is fit adjacent the engine.  
     
     
         5 . The anti-reversionary device of  claim 1  wherein the passages are angled radially inward at between 20 and 30 degrees.  
     
     
         6 . The anti-reversionary device of  claim 5  wherein each passage is angled radially inward at about 26 degrees.  
     
     
         7 . The anti-reversionary device of  claim 6  wherein the conduit is the exhaust from an internal combustion engine.  
     
     
         8 . The anti-reversionary device of  claim 7  wherein the anti-reversionary device is fit adjacent the engine.  
     
     
         9 . The anti-reversionary device of  claim 1  wherein the annular wall is a truncated cone which is angled downstream from the inner pipe to the conduit.  
     
     
         10 . The anti-reversionary device of  claim 9  further comprising a cylindrical housing adapted to fit to the bore of the conduit wherein the truncated cone extends between the cylindrical housing and inner pipe.  
     
     
         11 . The anti-reversionary device of  claim 10  wherein the housing, annular wall and inner pipe are formed as a unitary body formed of sheet material.  
     
     
         12 . The anti-reversionary device of  claim 11  wherein sheet material has a wall thickness which forms the passage through the annular wall.  
     
     
         13 . The anti-reversionary device of  claim 10  wherein the passages are angled radially inward at between 20 and 30 degrees.  
     
     
         14 . The anti-reversionary device of  claim 13  wherein each passage is angled radially inward at about 26 degrees.  
     
     
         15 . The anti-reversionary device of  claim 14  wherein the conduit is an exhaust from an internal combustion engine.  
     
     
         16 . The anti-reversionary device of  claim 15  wherein the anti-reversionary device is fit adjacent the engine.  
     
     
         17 . A conduit for directing gas flow to or from an internal combustion engine comprising one or more anti-reversionary device of  claim 1 .  
     
     
         18 . The conduit of  claim 17  wherein the passages of each of the one or more devices are angled radially inward at between 20 and 30 degrees.  
     
     
         19 . The conduit of  claim 18  wherein the annular wall of each of the one or more devices is a truncated cone which is angled downstream from the inner pipe to the conduit.  
     
     
         20 . The conduit of  claim 19  wherein the each passage is angled radially inward at about 26 degrees.