Abstract:
An embodiment of an exhaust handling system for a marine vessel includes a cap connected to a top end portion of an exhaust stack of the marine vessel to form an enclosure at least partially surrounding an outlet of an exhaust pipe extending through the exhaust stack. In addition, the exhaust handling system includes a collection pipe in fluid communication with the cap such that the collection pipe is to receive exhaust from the enclosure, and a coupling connected to the collection pipe that is to connect to an exhaust cleaning assembly. The exhaust cleaning system includes a tank to receive the exhaust. The cap at least partially defines a first flow path for the exhaust that extends from the enclosure to the atmosphere. The collection pipe at least partially defines a second flow path for the exhaust that extends from the enclosure to the coupling via the collection pipe.
Abstract:
Several embodiments of high-efficiency catalytic converters and associated systems and methods are disclosed. In one embodiment, a catalytic converter for treating a flow of exhaust gas comprising a reaction chamber, a heating enclosure enclosing at least a portion of the reaction chamber, and an optional coolant channel encasing the heating enclosure. The reaction chamber can have a first end section through which the exhaust gas flows into the reaction chamber and a second end section from which the exhaust gas exits the reaction chamber. The heating enclosure is configured to contain heated gas along the exterior of the reaction chamber, and the optional coolant channel is configured to contain a flow of coolant around the heating enclosure. The catalytic converter can further include a catalytic element in the reaction chamber.
Abstract:
Several embodiments of high-efficiency catalytic converters and associated systems and methods are disclosed. In one embodiment, a catalytic converter for treating a flow of exhaust gas comprising a reaction chamber, a heating enclosure enclosing at least a portion of the reaction chamber, and an optional coolant channel encasing the heating enclosure. The reaction chamber can have a first end section through which the exhaust gas flows into the reaction chamber and a second end section from which the exhaust gas exits the reaction chamber. The heating enclosure is configured to contain heated gas along the exterior of the reaction chamber, and the optional coolant channel is configured to contain a flow of coolant around the heating enclosure. The catalytic converter can further include a catalytic element in the reaction chamber.
Abstract:
Several embodiments of high-efficiency catalytic converters and associated systems and methods are disclosed. In one embodiment, a catalytic converter for treating a flow of exhaust gas comprising a reaction chamber, a heating enclosure enclosing at least a portion of the reaction chamber, and an optional coolant channel encasing the heating enclosure. The reaction chamber can have a first end section through which the exhaust gas flows into the reaction chamber and a second end section from which the exhaust gas exits the reaction chamber. The heating enclosure is configured to contain heated gas along the exterior of the reaction chamber, and the optional coolant channel is configured to contain a flow of coolant around the heating enclosure. The catalytic converter can further include a catalytic element in the reaction chamber.
Abstract:
An exhaust system for a small watercraft is disclosed, wherein the exhaust system includes an exhaust chamber having a predetermined volume, within which an exhaust gas discharged from an engine flows, the exhaust gas containing water supplied at a position of the exhaust system, and an exhaust pipe having an upstream end portion in a flow passage of the exhaust gas, which is connected to the exhaust chamber, the exhaust pipe being configured to discharge the exhaust gas from the exhaust chamber, wherein the upstream end portion of the exhaust pipe is configured to protrude into the exhaust chamber to a vicinity of a lower end of the exhaust chamber and has an upstream opening end face that opens substantially downward so as to be spaced apart a predetermined distance from an inner surface of the exhaust chamber, which is opposed to upstream opening end face.
Abstract:
Exhaust outlet equipment provided at a downstream end portion of an exhaust passage of a propulsion engine in a flow of an exhaust gas, wherein the engine is mounted in a small watercraft propelled by a water jet pump. The exhaust outlet equipment typically includes an exhaust pressure reducing chamber provided laterally of a pump room that contains the water jet pump, the chamber having a volume for reducing a pressure of the exhaust gas to a predetermined pressure. The exhaust pressure reducing chamber typically has an introduction port through which the exhaust gas from an exhaust pipe located on an upstream side in the flow of the exhaust gas flows into the exhaust pressure reducing chamber, and a discharge port through which the exhaust gas inside the exhaust pressure reducing chamber is discharged to an ambient side.
Abstract:
Disclosed is a personal watercraft capable of obtaining a high horsepower in a high engine speed even when a four-cycle engine is mounted in the personal watercraft limited in length. The personal watercraft adapted to eject water from an outlet port to be propelled as the resulting reaction, comprises: a multi-cylinder four-cycle engine contained in an engine room and having even cylinders of four or more cylinders; a water jet pump being driven by the engine, for pressuring and accelerating the water; primary collecting exhaust passages, each of which is configured to collect two exhaust passages respectively connected to exhaust ports of two cylinders of the engine into one exhaust passage; and a secondary collecting exhaust passage configured to collect the primary collecting passages.
Abstract:
Exhaust outlet equipment provided at a downstream end portion of an exhaust passage of a propulsion engine in a flow of an exhaust gas, wherein the engine is mounted in a small watercraft propelled by a water jet pump. The exhaust outlet equipment typically includes an exhaust pressure reducing chamber provided laterally of a pump room that contains the water jet pump, the chamber having a volume for reducing a pressure of the exhaust gas to a predetermined pressure. The exhaust pressure reducing chamber typically has an introduction port through which the exhaust gas from an exhaust pipe located on an upstream side in the flow of the exhaust gas flows into the exhaust pressure reducing chamber, and a discharge port through which the exhaust gas inside the exhaust pressure reducing chamber is discharged to an ambient side.
Abstract:
A watercraft is provided with an engine. An exhaust system routes exhaust gases from the engine to an external location. The exhaust system has an exhaust conduit and a catalytic device affixed to the exhaust conduit. The catalytic device has a tubular member that extends in the exhaust conduit. Two intermediate members extend in the tubular member one after another along a flow direction of the exhaust gases. The tubular member supports each intermediate member. The catalytic device has two catalysts. Each intermediate member is affixed to the tubular member at one end thereof and supports each catalyst at another end thereof.
Abstract:
The four stroke internal engine having an air intake system connected to the cylinder head and operatively connected to the intake passageway. The air intake system includes an air intake manifold having symmetrical construction with a central air passageway extending between a first end and a second end. At least one passageway extends from the central air passageway to a free end, which is operatively coupled to the intake passageway. The air intake system is usable for both a supercharged and normally aspirated engines.