Claims
- 1. An assembly for cooling exhaust from an internal combustion engine, comprising:
- a manifold including an exhaust cavity for receiving exhaust from said engine;
- a discharge exhaust passage leading from said exhaust cavity for discharging exhaust therefrom;
- first water jacket means around said exhaust cavity;
- second water jacket means around said discharge exhaust passage;
- means separating said first and second water jacket means, and including passage means providing communication therebetween;
- a first inlet for introducing water into said first water jacket means, said first inlet receiving engine cooling water after warm-up of said engine cooling water to a predetermined temperature;
- a second inlet for receiving overflow cooling water or engine cooling water prior to warm-up of said engine cooling water to said predetermined temperature; and
- means for preventing turbulence of water disposed within said first water jacket means during supply of water to said second inlet.
- 2. The assembly according to claim 1, wherein said turbulence preventing means comprises said second inlet being disposed adjacent said means separating said first and second water jacket means and downstream thereof for introducing water to said second water jacket means around said discharge exhaust passage.
- 3. The assembly according to claim 2, wherein a temperature sensitive flow control means controls the supply of warmed water to said first inlet so that during start-up or low speed operation, engine cooling water is not sufficiently warmed to open said temperature sensitive flow control means so that substantially no water is supplied to said first inlet, and so that after warm-up of said engine, engine cooling water is sufficiently warmed to open said temperature sensitive flow control means to supply warmed water to said first inlet.
- 4. The assembly according to claim 2, wherein said means separating said first and second water jacket means comprises dam means, and wherein said passage means is provided adjacent the uppermost point of said dam means.
- 5. The assembly according to claim 1, wherein said turbulence preventing means comprises said second inlet being disposed adjacent said means separating said first and second water jacket means and upstream thereof, and being substantially in alignment with said passage means so that water introduced into said second inlet flows through said passage means and into said second water jacket means.
- 6. The assembly according to claim 5, wherein a temperature sensitive flow control means controls the supply of warmed water to said first inlet so that during start-up or low speed operation, engine cooling water is not sufficiently warmed to open said temperature sensitive flow control means so that substantially no water is supplied to said first inlet, and water supplied to said second inlet under such conditions flows quiescently over water disposed in said first water jacket means and through said passage means into said second water jacket means for preventing mixing of water passing through said second inlet with water in said first water jacket means, and so that after warm-up of said engine, engine cooling water is sufficiently warmed to open said temperature sensitive flow control means to supply warmed water to said first inlet, resulting in mixing of water introduced through said first and second inlets prior to passage of such water through said passage means.
- 7. The assembly according to claim 5, wherein said means separating said first and second water jacket means comprises dam means, and wherein said passage means is provided adjacent the uppermost point of said dam means, and said second inlet is disposed adjacent the uppermost point of said first water jacket means so that water introduced therethrough flows through the uppermost point of said first water jacket means over water disposed therein, and thereafter through said passage means.
- 8. An assembly for cooling exhaust from an internal combustion engine, comprising:
- an exhaust manifold having an internal cavity for receiving exhaust from said engine;
- first water jacket means around said exhaust cavity;
- an exhaust discharge elbow connected to said exhaust manifold and having an exhaust discharge passage in communication with said exhaust cavity for discharging exhaust therefrom through an exhaust discharge outlet provided in said exhaust elbow;
- second water jacket means around said exhaust elbow, said second water jacket means having a water discharge outlet;
- dam means disposed between said first water jacket means and said second water jacket means;
- water passage means through- said dam means for allowing communication between said first water jacket means and said second water jacket means;
- a first inlet for introducing water into said first water jacket means;
- a second inlet for introducing water into either said first or second water jacket means adjacent said water passage means;
- water supply means for supplying water to said second inlet; and
- temperature sensitive flow control means for controlling the supply of water to said first inlet so that, when engine cooling water is not sufficiently warmed to open said temperature sensitive flow control means, substantially no water is supplied to said first inlet, and so that, when engine cooling water is sufficiently warmed to open said temperature sensitive flow control means, said temperature sensitive flow control means provides flow of said unwarmed water to said first inlet.
- 9. The assembly according to claim 8, wherein said exhaust manifold and said exhaust elbow are integrally formed.
- 10. The assembly according to claim 8, wherein said water discharge outlet from said second water jacket means is disposed upstream of said exhaust discharge outlet.
- 11. The assembly according to claim 8, wherein said water passage means comprises a passage through said dam means, said passage being provided adjacent the uppermost point of said dam means.
- 12. The assembly according to claim 8, wherein said second inlet introduces water into said second water jacket means adjacent said water passage means at a point downstream of said dam means.
- 13. The assembly according to claim 8, wherein said second inlet introduces water into said first water jacket means upstream of said dam means, said second inlet being substantially aligned with said water passage means, so that during start-up or low speed operation of said engine, water flowing through said second inlet into said first water jacket means flows quiescently over water disposed in said first water jacket means and through said water passage means to said second water jacket means, and wherein water flowing through said first inlet into said first water jacket means after warm-up in response to said temperature sensitive flow control means mixes with water flowing through said second inlet prior to passing through said water passage means.
- 14. A water jacketed exhaust elbow for use on an internal combustion engine, said exhaust elbow being adapted for interconnection with the cooling system and exhaust system of said engine, said cooling system including a temperature sensitive flow control valve and a warm water coolant line interconnected between said temperature sensitive flow control valve and said exhaust elbow, said cooling system further including an unwarmed water coolant line interconnected between said temperature sensitive flow control valve and said exhaust elbow, said exhaust elbow comprising:
- a manifold including an exhaust cavity for receiving exhaust from said engine;
- a discharge exhaust passage leading from said exhaust cavity for discharging exhaust therefrom;
- first water jacket means around said exhaust cavity;
- second water jacket means around said discharge exhaust passage;
- means separating said first and second water jacket means, and including passage means providing communication therebetween;
- a first inlet in communication with said warm water coolant line for introducing warmed water into said first water jacket means when the temperature of said warmed water is sufficient to open said temperature sensitive flow control valve; and
- a second inlet in communication with said unwarmed water coolant line for introducing unwarmed water at a location adjacent said discharge exhaust passage.
- 15. An assembly for cooling exhaust from an internal combustion engine, comprising:
- a manifold including an exhaust cavity;
- one or more exhaust inlets for receiving exhaust from said engine and introducing exhaust into said exhaust cavity;
- said jacket means around said exhaust cavity and including a water jacket outlet for discharging water therefrom, and further including a lower wall defining the lower extent of said water jacket means, with said water jacket means above said lower wall defining a common cavity through which said one or more exhaust inlets extend so that the common cavity of said water jacket means substantially surrounds said one or more exhaust inlets;
- an inlet for introducing water into said water jacket means; and
- means between said inlet and said water jacket means for providing substantially even circulation of water to said one or more exhaust inlets prior to circulation of said water through said water jacket means, comprising a duct below said lower wall for receiving water from said inlet prior to circulation through said water jacket means, and passage means providing communication through said lower wall between said duct and said water jacket means for providing water to said water jacket means.
- 16. An assembly for cooling exhaust from an internal combustion engine, comprising:
- a manifold including an exhaust cavity;
- one or more exhaust inlets for receiving exhaust from said engine and introducing exhaust into said exhaust cavity;
- water jacket means around said exhaust cavity and including a water jacket outlet for discharging water therefrom;
- an inlet disposed in a side of said assembly for introducing water into said water jacket means; and
- means between said inlet and said water jacket means for providing substantially even circulation of water to passages around each of said one or more exhaust inlets prior to circulation of said water through said water jacket means, comprising ducting means disposed in the lower portion of said assembly and in communication with said inlet for receiving water prior to circulation through said water jacket means, said ducting means providing unobstructed flow of water from said inlet to an area adjacent each said exhaust inlet prior to circulation of water through said water jacket means, and wherein said even circulation providing means further comprises a wall disposed adjacent said inlet for directing a major portion of water from said inlet downwardly to said ducting means.
- 17. An assembly for cooling exhaust from an internal combustion engine comprising:
- a manifold including an exhaust cavity for receiving exhaust from said engine;
- one or more exhaust inlets for receiving exhaust from said engine and introducing exhaust into said exhaust cavity;
- a discharge exhaust passage leading from said exhaust cavity for discharging exhaust therefrom;
- first water jacket means around said exhaust cavity;
- ducting means around said exhaust inlets and providing communication with said first water jacket means;
- second water jacket means around said discharge exhaust passage;
- means separating said first and second water jacket means, and including first passage means providing communication therebetween;
- a first inlet for introducing water into said first water jacket means and said ducting means;
- a second inlet for introducing cooling water;
- means for preventing turbulence of water disposed within said first water jacket means during introduction of water by said second inlet.
- 18. An assembly as claimed in claim 17, further comprising a means directing substantially all water introduced by first inlet to said ducting means.
- 19. An assembly as claimed in claim 18, wherein said directing means comprises second passage means in communication with said first water jacket means to permit air and other fluids to pass therebetween.
- 20. An assembly as claimed in claim 19, wherein said turbulence preventing means comprises said second inlet being disposed adjacent said means separating said first and second water jacket means and upstream thereof, and being substantially in alignment with said first passage means such that water introduced by said second inlet flows through said passage means and into said second water jacket means.
- 21. An assembly as claimed in claim 17, wherein said first inlet introduces only water warmed to above a predetermined temperature level.
- 22. An assembly as claimed in claim 19, wherein said first inlet introduces only water warmed to above a predetermined level.
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 07/177,677 filed Apr. 5, 1988 and now abandoned.
This invention relates to a marine propulsion system in which exhaust is discharged from the engine into a water jacketed manifold, and in which engine coolant water is discharged into the engine combustion product exhaust.
In a marine propulsion system, it is known to provide a combination exhaust manifold and exhaust elbow in which the manifold is surrounded by a water jacket and in which the engine coolant water in the water jacket is mixed with the engine exhaust at discharge from the manifold and elbow. In known systems, one or more water inlets for the water jacket around the exhaust manifold are provided adjacent or along the base of the exhaust manifold. After circulation through the engine cooling system, engine coolant water passes through the manifold water jacket inlet and flows through the manifold water jacket prior to passage into the exhaust elbow for discharge into the engine exhaust. The single manifold water jacket inlet receives water having a wide range of temperatures. For example, during start-up and low speed operation, engine coolant water exiting the engine cooling system is relatively cold, having been supplied from a lake or other body of water and absorbing little heat from the engine during passage through the engine cooling system. In this circumstance, the relatively cold water flowing through the water jacket around the exhaust manifold will maintain the walls of the exhaust cavity within the exhaust manifold at a like temperature. Under these conditions, it is possible for moisture to condense out of the engine exhaust. Such condensation can damage the engine, especially at idle or after shutdown.
The present invention is designed to eliminate such formation of harmful condensate and to provide a more efficient and effective method of cooling a marine engine exhaust manifold. In accordance with the invention, a water jacketed exhaust discharge assembly includes an exhaust manifold having an exhaust cavity and a discharge exhaust passage leading therefrom. Water jacket means is provided around the exhaust discharge passage and the exhaust cavity for cooling the engine exhaust prior to discharge. A first inlet is provided for introducing water into the water jacket means around the exhaust cavity. The water passing through the first inlet is warmed prior to entrance therein, and the flow of such water is controlled by a temperature sensitive flow control means, such as a thermostat. A second inlet is provided for introducing unwarmed water into the water jacket means adjacent the discharge exhaust passage. The unwarmed water flowing into the second inlet is either water which bypasses the engine cooling system, or which is circulated therethrough but is unwarmed by the engine. In one embodiment, an exhaust discharge elbow is connected to the exhaust manifold. An exhaust passage having an exhaust outlet is provided in the elbow, and communicates with the exhaust cavity for discharging exhaust therefrom. A first water jacket means is provided around the exhaust elbow. Dam means is disposed between the first and second water jacket means. Water passage means, such as a passage over the dam means, allows fluid communication between the first and second water jacket means. The first inlet introduces warm water into the first water jacket means, and a second inlet introduces unwarmed water across the top of the first or into the second water jacket means adjacent the passage in the dam means.
US Referenced Citations (5)
Continuation in Parts (1)
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Number |
Date |
Country |
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177677 |
Apr 1988 |
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Patent Grant
4977741
