US 4,019,456 A · Marine wet exhaust system and improvements in powered marine vessel

Abstract

An exhaust gas-cooling water separation chamber, a gas collection chamber and gas acceleration and gas flow-shaping conduit means. The entrance of the separation chamber is connectable to water coolant and gas exhaust tubes from a marine engine. The separation chamber is fitted with a water deflector disposed below the gas exit from that chamber, while a gas dam is disposed in the water exit from that chamber, the entrance and water exit going below the deflector level. The gas collection chamber is connected to the gas exit and a gas acceleration chamber which tapers downstream is connected to the gas collection chamber. A gas velocity tube is connected to and extends downstream of the gas acceleration chamber to cause exhaust gases to exit through the hull of a boat in which the system may be installed with sufficient force to penetrate the turbulent boundary layer of air around the boat hull when the boat is in motion, thus preventing the gases from passing back into the rear of the boat, due to the "station wagon" effect. An air dilution tube can be connected to the gas velocity tube to provide a scarfing action by the exhaust gases, causing their dilution to below noxious levels. The system may include exhaust noise-retarding means, such as a muffler and/or air barrier at the separation chamber entrance.

Claims27

Dependent claims

An improved marine wet exhaust system comprising, in combination:

A. an exhaust gas-cooling water separation chamber having a cooling water and exhaust gas entrance, a water exit spaced downstream from said entrance and a gas exit disposed above the level of said entrance and said water exit;
B. a water deflector disposed in said separation chamber above the level of said entrance and said water exit but below said gas exit for deflecting water away from said gas exit while permitting gas to pass into said gas exit;
C. a gas dam disposed in said water exit to block the passage of gas from said chamber through said water exit;
D. a gas collection chamber connected to said gas exit and having a predetermined cross section;
and,
E. gas acceleration and flow shaping conduit means connected to the downstream end of said gas collection chamber and having a portion gradually tapering downstream to provide a predetermined back pressure in said exhaust system and a terminal portion connected thereto and shaped to cause exhaust gases when exiting therefrom to penetrate the turbulent boundary layer of air associated with the periphery of a boat in motion,
said system being adapted to propel exhaust gases sufficiently far away from said boat to preclude said gases from being passed into the rear of said boat by the station wagon effect.

4 more elements

In a powered marine vessel which includes a hull, an inboard engine within the hull adapted to drive the vessel and a water cooling system for the engine, the improvement which comprises an improved marine wet exhaust system comprising, in combination:

A. an exhaust gas-cooling water separation chamber interconnected to said engine and having a cooling water and exhaust gas entrance, a water exit spaced downstream from said entrance and a gas exit disposed above the level of said entrance and said water exit;
B. a water deflector disposed in said separation chamber above the level of said entrance and said water exit but below said gas exit for deflecting water away from said gas exit while permitting gas to pass into said gas exit;
C. a gas dam disposed in said water exit to block the passage of gas from said chamber through said water exit;
D. a gas collection chamber connected to said gas exit and having a predetermined cross section;
and,
E. gas acceleration and flow shaping conduit means connected to the downstream end of said gas collection chamber and having a portion gradually tapering downstream to provide a predetermined back pressure in said exhaust system and a terminal portion connected thereto, terminating at a part in said hull and shaped to cause exhaust gases when exiting therefrom to penetrate the turbulent boundary layer of air around said hull when said boat is in motion,
said system being adapted to propel exhaust gases sufficiently far away from said boat to preclude said gases from being passed into the rear of said boat by the station wagon effect.

4 more elements

Dependencies are inferred from the claim text.

Marine wet exhaust system and improvements in powered marine vessel

Life of this patent

Marine wet exhaust system and improvements in powered marine vessel

Life of this patent

Abstract

Claims27