Reciprocation engine exhaust scavenging system

Abstract

An exhaust gas scavenging apparatus includes a series of chambers designed to actively lower the exhaust gas back pressure of an internal combustion engine. The device uses the waste energy from the exhaust system in the form of both the Venturi principle and the amplification of a pulse wave effect. The scavenging system uses a series of in-line tubes or a single tube with perforations, passing through multiple sealed chambers using the Venturi effect to lower the pressure in each chamber.

What is claimed is: 
     
         1 . An exhaust gas scavenging apparatus for an internal combustion engine, comprising:
 a plurality of sealed interconnected chambers, each having at least one outer sidewall and an end wall to define a cavity therein;   a plurality of in line tubes that pass through the plurality of sealed chambers, the plurality of in line tubes interconnected along a length of the exhaust gas scavenging apparatus, the plurality of in line tubes configured to receive an exhaust gas flow from an exhaust of the internal combustion engine and communicate the exhaust gas through the plurality of sealed chambers;   the plurality of in line tubes each having a sidewall, an inlet and an outlet, the inlet having a larger diameter than the outlet, wherein the sidewall converges inwardly along a length of the tube to define a Venturi constriction proximal to the outlet; wherein the outlet of a preceding in line tube is received within the inlet of a subsequent in line tube.   
     
     
         2 . The exhaust gas scavenging apparatus of  claim 1 , further comprising:
 a Venturi opening formed between the outlet of the preceding in line tube and the inlet of a subsequent in line tube.   
     
     
         3 . The exhaust gas scavenging apparatus of  claim 2 , wherein the Venturi opening is formed within each of the plurality of sealed chambers. 
     
     
         4 . The exhaust gas scavenging apparatus of  claim 3 , wherein the end walls are sealed around the sidewall of the in line tubes. 
     
     
         5 . The exhaust gas scavenging apparatus of  claim 4 , wherein the end walls of the plurality of sealed chambers are sealed around an intermediate portion of each in line tube. 
     
     
         6 . The exhaust gas scavenging apparatus of  claim 5 , wherein the Venturi opening is located at an intermediate position within the plurality of sealed chambers. 
     
     
         7 . An exhaust gas scavenging apparatus for an internal combustion engine, comprising
 a plurality of sealed interconnected chambers, each having at least one outer sidewall and an end wall to define a cavity therein;   an in line tube carried through the plurality of sealed chambers, the in line tube configured to receive an exhaust gas flow from an exhaust of the internal combustion engine and communicate the exhaust gas through the plurality of sealed chambers;   a Venturi constriction defined in the in line tube in each of the plurality of sealed interconnected chambers; and   a Venturi opening defined at an end of the Venturi constriction, configured to communicate an exhaust gas pulse between the cavity and an interior of the in line tube.   
     
     
         8 . The exhaust gas scavenging apparatus of  claim 7 , wherein the Venturi opening comprises a perforation through a sidewall of the in line tube. 
     
     
         9 . The exhaust gas scavenging apparatus of  claim 7 , wherein the in line tube comprises a plurality of interconnected in line tube segments each having a sidewall, an inlet and an outlet, the inlet having a larger diameter than the outlet, wherein the sidewall converges inwardly along a length of the in line tube to define a Venturi constriction proximal to the outlet. 
     
     
         10 . The exhaust gas scavenging apparatus of  claim 9 , wherein the Venturi opening formed between the outlet of a preceding in line tube and the inlet of a subsequent in line tube. 
     
     
         11 . The exhaust gas scavenging apparatus of  claim 10 , wherein the end walls are sealed around the sidewall of the in line tube. 
     
     
         12 . The exhaust gas scavenging apparatus of  claim 11 , wherein the end walls of the plurality of sealed chambers are sealed around an intermediate portion of the in line tubes. 
     
     
         13 . The exhaust gas scavenging apparatus of  claim 5 , wherein the Venturi opening is located at an intermediate position within the plurality of sealed chambers.