Power plants – Internal combustion engine with treatment or handling of... – Exhaust gas or exhaust system element heated – cooled – or...
Reexamination Certificate
2002-04-22
2003-11-11
Denion, Thomas (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
Exhaust gas or exhaust system element heated, cooled, or...
C060S298000, C060S321000, C060S323000, C440S08800J, C440S08900C
Reexamination Certificate
active
06644024
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is generally related to an exhaust system for a marine engine and, more particularly, to an exhaust system that mixes the dry exhaust gases from two groups of cylinders prior to mixing the exhaust gases with cooling water.
2. Description of the Prior Art
Various types of exhaust system for marine engines are known to those skilled in the art. Typically, exhaust gases are conducted from cylinders of the engine to an exhaust pipe while maintained in thermal communication with cooling water previously used to cool heat producing components of the engine. The cooling water may be contained within a water jacket surrounding various exhaust components of the engine or mixed directly with the exhaust gases.
U.S. Pat. No. 6,290,558, which issued to Erickson on Sep. 18, 2002, discloses an exhaust elbow with a water trap for a marine propulsion system. The exhaust elbow is provided with a water trap section that defines a water collection cavity. Within the water trap section, a barrier extends downward into the water collection cavity to define first and second exhaust passages. When water begins to collect in the water collection cavity, the cross sectional area of the exhaust passage is reduced and the velocity of exhaust gases passing through the exhaust passage is increased. The water collection cavity is shaped to be easily cleared when exhaust gas pressure increases as the engine speed increases.
U.S. Pat. No. 4,845,945, which issued to Widmer et al on Jul. 11, 1989, discloses an exhaust elbow trough. A water jacketed exhaust elbow for a marine propulsion system includes an intake exhaust passage communicating with a discharge exhaust passage, a water jacket around the exhaust passages, and a trough member extending longitudinally along a water channel along the exterior of the discharge exhaust passage to guide water therealong to mix with exhaust at the end of the discharge exhaust passage. The trough member extends beyond the exhaust tip of the discharge exhaust passage and has a sharp edge providing a clean parting surface for the coolant water and preventing ingestion of water back into the discharge exhaust passage.
U.S. Pat. No. 5,109,668, which issued to Lindstedt on May 5, 1992, discloses a marine exhaust manifold and elbow. A marine exhaust assembly includes a manifold portion, an elbow portion, a water jacket portion, and exhaust runner walls, providing a smooth continuous transition of exhaust gas flow from intake exhaust passages in the manifold portion to transfer exhaust passages in the elbow portion around a bend to a discharge exhaust passage, minimizing turbulent flow of exhaust through the manifold portion and elbow portion. Each transfer exhaust passage has its own water supply inlet at the upstream end of the respective intake exhaust passage. An upper vent includes a steam outlet opening in the water jacket at the high point of the elbow portion, and a steam exhaust channel extending along the top exterior of the water jacket portion in a raised bead above and parallel to an upper water flow passage and directing steam to the end of the discharge exhaust passage to mix with water and exhaust thereat. Wall supports assist in directing cooling water up through the water jacket to the top of the elbow bend, and also prevent wall collapse during lost foam stainless steel casting.
U.S. Pat. No. 4,977,741, which issued to Lulloff et al on Dec. 18, 1990, discloses a combination exhaust manifold and exhaust elbow for a marine propulsion system. The combination exhaust manifold and exhaust elbow for an internal combustion engine includes an exhaust cavity for receiving exhaust from the engine, an exhaust passage leading from the exhaust cavity, and an exhaust discharge outlet. A first water jacket is provided around the exhaust cavity and a second water jacket is provided around the exhaust discharge passage. A dam is provided between the first and second water jackets, having a passage therein for allowing fluid communication between the first and second water jackets. A warm water inlet is provided in the first water jacket around the exhaust cavity for receiving cooling water which has been warmed by the engine, in which flow is controlled by a temperature sensitive thermostat. A cold water inlet is provided adjacent the discharge exhaust passage. The cold water inlet is disposed either upstream or downstream of the dam adjacent the exhaust passage, and allows cold bypass water to be discharged without the necessity of the cold water flowing through the entire assembly, so as to prevent moisture from condensing out of the exhaust in the exhaust cavity.
U.S. Pat. No. 4,759,181, which issued to Biritz on Jul. 26, 1988, describes a manifold, apparatus and system for exhaust transfer and cooling of V-type marine engines. A manifold and cooling system for V-type marine engines utilizing two novel exhaust manifold/cooling jacket units, each unit having separate cavities and a flow-through heat exchanger whereby engine coolant circulates through the engine block pumped by a water pump first into a forward cavity of one unit in fluidic communication with an exhaust manifold channel wall the traveling adjacent to the heat exchanger into a rearward cavity and into fluidic communication with a second portion of an exhaust manifold channel wall and then out of the unit via piping to a second unit into a rear cavity with similar fluidic communication with a second exhaust manifold channel wall than along a heat exchanger into a forward cavity and further channel wall contact, out of this unit and back into an engine block to complete the coolant circuit. Raw water is pumped through each heat exchanger and expelled back to the sea.
U.S. Pat. No. 4,801,283, which issued to Ruhnke on Jan. 31, 1989, discloses a mixing tube assembly for a marine propulsion system. In a marine propulsion system including an internal combustion engine, a mixing tube assembly is disposed between an exhaust manifold and a discharge pipe for discharging mixed water and exhaust. The mixing tube assembly is adapted for connection to the exhaust manifold by means of a resilient connector member, such as a flanged rubber boot. This form of connection allows the adjacent surfaces of so the mixing tube and the manifold to be non-machined, and provides suspension of the mixing tube from the manifold. The mixing tube includes an exhaust passage having a water jacket therearound for cooling exhaust passing therethrough. A water inlet is provided for introducing water into the water jacket. Water is discharged from the water jacket through a circumferential water discharge outlet, and exhaust is discharged from the exhaust passage through an exhaust outlet. A mixing cavity is disposed downstream of the water jacket and the exhaust passage for receiving discharged water and exhaust and mixing the water with the exhaust prior to discharge through a discharge outlet.
U.S. Pat. No. 4,573,318, which issued to Entringer et al on Mar. 4, 1986, discloses an exhaust elbow for a marine propulsion system. A marine propulsion system is provided with an exhaust elbow having an intake exhaust passage extending upwardly from the engine and communicating through a bend with a discharge exhaust passage, a water jacket having pockets around the exhaust passages for cooling the latter. A central channel extends longitudinally along the exterior of the exhaust passages to guide water therealong to the end of the discharge exhaust passage to mix with exhaust thereat. The central channel has a pair of sidewalls extending longitudinally and laterally tapered away from each other at the outer end of the discharge exhaust passage to create an outward draw for the central channel to minimize break-up of longitudinally outward water flow and maintain the end tip of the discharge exhaust passage dry and prevent water ingestion and creeping back into the discharge exhaust passage due to pulsations of the engine. Dam and port structure is also provided enabling faste
Horak James M.
Powers Loren T.
Brunswick Corporation
Denion Thomas
Lanyi William D.
Tran Binh
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