140 results about "Two-stroke diesel engine" patented technology

The invention discloses a return flow scavenging type hydraulic free piston diesel engine, which comprises a single-cylinder two-stroke diesel engine without a crankshaft connecting rod and a valve distribution mechanism, and a hydraulic system provided with a linear hydraulic pump and a hydraulic motor, wherein a piston in the single-cylinder two-stroke diesel engine is connected with a plunger in the hydraulic system, and a space in the linear hydraulic pump in the hydraulic system is divided into a high-pressure cavity and a low-pressure cavity; the piston in the single-cylinder two-stroke diesel engine can drive the linear hydraulic pump to output high-pressure oil in an expansion travel, and the high-pressure oil is output to the hydraulic motor from a pipe joint C; the piston is pushed back to an upper dead center from a lower dead center by the low-pressure oil end, so that a compression travel of the piston is completed. According to the invention, a crankshaft in the conventional internal combustion engine is omitted, and a middle conversion step of power output is reduced, so that the heat efficiency is about 5% higher than that of the conventional internal combustion engine, the diesel engine can be operated at a variable compression ratio, the best heat efficiency of a full operation work condition is ensured, and the fuel economy is improved.

A four stroke diesel engine combined with a supercharger is operable to supply varying amounts of air to the engine responsive to the load on the engine. The supercharger has a pair of rotors driven by the engine operable to move air to the engine. Gates associated with the rotors control the amount of air and pressure of the air moved by the rotors to the diesel engine.

A large uniflow two-stroke diesel engine of the crosshead type with a plurality of cylinders with at least one exhaust valve (11) per cylinder and one or more fuel injectors (23) per cylinder. The fuel injection is performed under the influence of a source of high-pressure fluid. Potential energy is accumulated by compression in a volume (67) of the high-pressure fluid. Electro-hydraulic valves (39) control the fuel injection that is primarily driven by energy accumulated in the volume (67) of high pressure. The engine has a camshaft (28) for actuation of the exhaust valves (11). Hydraulic piston pumps (37) are driven by the cams (29) on the camshaft. Hydraulic actuators (21) move the exhaust valves (11) in the opening direction with hydraulic fluid received via conduits from the hydraulic piston pumps (37) .

The invention relates to a large two-stroke diesel engine with a exhaust gas recirculation system. In particular, the invention relates to a large crosshead turbocharged two-stroke diesel engine, which comprises a plurality of cylinders, each of which is connected to an exhaust gas receiver, and an exhaust gas recirculation flow channel for supplying a part of the exhaust gas to a scavenging air flow, and also comprises a wet scrubber, a cooler, a device for removing condensed water, and a blower in the exhaust gas recirculation flow channel. The invention also relates to a method for the exhaust gas recirculation in the large crosshead turbocharged two-stroke diesel engine, wherein the engine comprises a plurality of cylinders, each of which is connected to an exhaust gas receiver.

The invention provides a vessel two-stroke diesel engine exhaust gas recirculation system and a control method. A work mode is a non-EGR (exhaust gas recirculation) mode and an EGR mode; when the vessel sails in a non-exhaust control region, the diesel engine works under the non-EGR mode, the exhaust gas exhausted from an exhaust manifold drives turbines to apply work so as to drive a gas compressor to compress air; the pressurized fresh air is cooled and dehumidified and then enters into the engine from a scavenging air receiver to participate in burning; when the vessel sails in an exhaust control region, the diesel engine works under the EGR mode, part of waste gas is led from the exhaust manifold and then flows to a one-way stop valve , then the waste gas is cooled and washed, so that the temperature is reduced, and the particles and SOx are removed; then, the exhaust gas is pressurized by an EGR fan and humidified by a drop catcher to mix with fresh air from the gas compressor in the scavenging air receiver, and then enters into an air cylinder to participate in burning; the NOx generation and exhaust amount of the engine are reduced, the Tier III standard related to NOx exhaust of IMO (International Meteorological Organization) can be satisfied.

The present invention relates to a large two-stroke diesel engine (1) of the cross-head type in which the exhaust valves (11) are hydraulically actuated by providing hydraulic actuators (19) associated with each of the exhaust valves (11) with high pressure hydraulic fluid. Fuel oil or heavy fuel oil can be used as hydraulic fluid. The invention also relates to a control valve (25) for use in such an engine (1) , to a hydraulic system for such an engine (1) and to an hydraulic actuator (19) for such an engine (1).

A large two-stroke turbocharged diesel engine of the crosshead type provided with an exhaust gas recirculation system and with a fuel injection system that can, selectively add water to the fuel flow to thereby increase the mass flow through the injection nozzles under particular operating conditions, e.g. at high exhaust gas recirculation rates. The increased mass flow through the injection nozzles improves the entrainment of the fresh charge into the high-speed of the fuel spray and thereby increases the fuel/air mixing and brings the combustion towards the lean side and hence counteracts soot formation.

The invention provides a waste gas pollutant combined removal device for a two-stroke diesel engine. The waste gas pollutant combined removal device comprises a waste gas washing device and a recirculation waste gas flow control device, the waste gas washing device comprises a washer, a washing solution storage box, a circulation pump, a SOx absorbing agent supply device and a fresh waste supply device, and the recirculation waste gas flow control device comprises a flow regulating valve, a recirculating draught fan and a one-way control valve. According to the waste gas pollutant combined removal device, waste gas of the two-stroke diesel engine is washed, the SOx content and the particle content in the waste gas are reduced, part of low-temperature clean waste gas is recirculated, the NOx generation amount of the engine is reduced, and combined desulfurization and denitration of waste gas pollutants of the ship diesel engine is achieved. According to the waste gas pollutant combined removal device, part of washed waste gas is recirculated, the combustion condition in a cylinder is improved to a large extent,by CO2 and vapor contained in the low-temperature clean waste gas and the NOx generation amount and the final discharge amount of the engine are reduced.

A large turbocharged two-stroke diesel engine with crossheads, said engine having a plurality of cylinders (1) in line, a turbocharger (5) and an SCR reactor (19) upstream of the turbocharger and downstream of an exhaust gas receiver (3) . The exhaust gas receiver (3) is connected to the individual cylinders (1) via respective exhaust ducts (35) that introduce the exhaust gas tangentially and cause a swirl in the exhaust gas inside the exhaust gas receiver (3) . The exhaust gas receiver (3) is provided with an outlet (33) . A unit (42) with plurality of vanes (43) around a central axial duct (47) divides the exhausts gas receiver (3) in a mixing section (48) downstream of the unit and an outlet section (49) upstream of the unit (42) The swirling exhaust gas passes along the vanes (43) on its way from the inixing section (48) to the outlet section (49) and the vanes (43) cause the exhaust gas to lose its swirl and gain pressure. The pressure gain causes a portion of the exhaust gas in the outlet section (49) to flow back to the mixing section (48) via said central duct (47) . The reductant is introduced in the flow in said central duct 47) . A large turbocharged two-stroke diesel engine with an exhaust gas receiver (3) with tangential inlets (35) and a tangential outlet (39) is also disclosed It is suggested that Fig. 4 is published with the abstract.

The invention relates to a large two-stroke diesel engine with a exhaust gas recirculation control system. In particular, the invention relates to a large crosshead turbocharged two-stroke combustion engine, which comprises: a plurality of cylinders, each of which is connected to an exhaust gas receiver; and an exhaust gas recirculation flow channel for recirculating at least a part of the exhaust gas to a scavenging air channel. At least a part of the exhaust gas recirculation flow channel comprises at least two parallel links, wherein each link forms a flow channel, and each link comprises at least one device for processing or controlling the recirculated exhaust gas. The invention also relates to a method for controlling the exhaust gas recirculation system in the large crosshead turbocharged two-stroke diesel engine.

The invention relates to an exhaust valve actuator for large-scaled two-stroke diesel motor that is able to move between a closed position and an open position along opposite directions. The actuator includes a bidirectional hydraulic piston including a hydraulic closed chamber and a hydraulic open chamber. The bidirectional spring component is connected to the bidirectional piston and forms a mass spring system with the mandrel of exhaust valve actuator and any other mass of the component that accordantly moves therewith. The bidirectional spring component stores energy when the exhaust valve actuator reciprocally moves between the closed position and the open position so as to push the exhaust valve actuator along the opposite direction. An open/closed hydraulic valve alternatively connects the hydraulic closed chamber to a high pressure source and connects a hydraulic open chamber to an oil cylinder, or on the contrary. When the exhaust valve actuator is in an open position and when an electronically controlled hydraulic valve connects the hydraulic open chamber to a high pressure hydraulic fluid source, the closing force of the bidirectional spring and the opening force of the hydraulic open chamber are balanceable.

A propulsion system for large ocean going vessels. The system includes a large turbo charged multi-cylinder two-stroke diesel engine of the crosshead type coupled to the propeller shaft as a main prime mover and one or more substantially smaller diesel engines coupled to generators as secondary prime movers. The main engine requires electric, hydraulic and pneumatic power in order to be able to startup and operate. The main engine requires heat and small hydraulic power during short stops, and hydraulic power, pneumatic and electrical power during startup. Hydraulic power is provided by one or more high-pressure pumps or pumping stations that are driven by power takeoff from the crankshaft of the large two-stroke diesel engine, by electric motors or by auxiliary diesel engines.

A large two-stroke diesel engine of the crosshead type with a bedplate, a frame box mounted on the bedplate and a cylinder frame mounted on the frame box. The bedplate comprises welded cross girders with the main bearings for the crankshaft. The cross girders include a main bearing support made from a rolled steel slab or plate with an arc shaped support surface machined therein. The slab or plate is welded to the webplates to form a cross girder.

The invention relates to an internal combustion engine, in particular a large two-stroke diesel engine, comprising at least one combustion chamber (2) delimited by a cylinder (1) and a piston (3) interacting with a crankshaft, said combustion chamber comprising at least one combustion gas outlet (20; 120; 320; 420), which is formed between a valve disk (8; 108; 308) of an exhaust valve (9; 109; 309) and an associated disk seat, and at least one charge air inlet (4). The exhaust valve (9; 109; 309) can be actuated between an open position and a closed position. The combustion gas outlet (20; 120; 320; 420) is connected to at least one outlet channel (11) and to at least one combustion gas draw-off duct (18; 118a, 118b; 318, 318a; 418, 418a), for example in order to recirculate part of the combustion gas generated during combustion to the charge air inlet (4). The invention further relates to an exhaust valve (9; 109; 309) and to a cylinder head for such an internal combustion engine. The invention is characterized by a throttle device (10; 110; 310) which is fastened to the exhaust valve (9; 109; 309) or integrally molded as part of the exhaust valve (9; 109; 309) and by means of which the combustion gas is drawn off in a predetermined way. The invention further relates to a method for producing an internal combustion engine, to a method for operating an internal combustion engine, and to a use for an internal combustion engine.

The present invention provides a large two-stroke diesel engine with an exhaust gas scrubber, wherein the water with high salinity is pumped to the exhaust gas scrubber for generating spray. The exhaust gas passes through the spray for reducing the content of SO2. The engine is also provided with a scavenging humidifying unit which is operated by sea water and/or a fresh water generator that converts sea water to fresh water. The high salinity waste water of the scavenging humidifying unit and/or the fresh water generator is used for the exhaust gas scrubber. Compared with the common sea water, the high salinity of the waste water increases the efficiency of the scrubber. Therefore, a considerably large pumping workload required for keeping the operation of scrubber can be remarkably reduced.

The invention provides a large two-stroke diesel engine with a common fuel injection system. A fuel injection of a large two-stroke diesel engine includes a low pressure conduit, an intermediate pressure conduit, a high pressure common fuel rail. The control valves control the flow from the common fuel rail to the fuel injection valve. The fuel valve comprises a entry connected with control valve through injection conduit, and a exit connected with the low pressure conduit. The control valve connects the injection conduit with common rail when the fuel injection starts, and connects the injection conduit with low pressure conduit or intermediate pressure conduit when the fuel injection ends. The invention furthermore comprises valve gear for connecting the intermediate pressure conduit with injection conduit directly or by control valve, and for fuel cycle during outofoperation of engine.

A positively dimensioned crosshead bearing (1) having a crosshead journal (4) with an axial bore (5) receiving system oil via a flexible connection. The system oil is distributed to the piston, the bearing surface of the crosshead and the crankpin bearing. At least two axial lubrication grooves (22) are disposed in the lower bearing surface. The bearing surface between the at least two axial lubrication grooves (22) is not interrupted nor distorted.

The invention relates to a two-stroke diesel engine. The two-stroke diesel engine comprises a cylinder sleeve, an exhaust pipe and a piston and is characterized in that a gas inlet pipe is arranged outside the cylinder sleeve, fresh air with certain pressure exists in the gas inlet pipe, the gas inlet pipe is communicated with a gas inlet on the cylinder sleeve through a gas inlet channel, and a gas inlet valve opening on the gas inlet channel is provided with a gas inlet valve which can open and close the gas inlet valve opening; an exhaust valve is opened and waste gas is exhausted before the piston moves down to a position at which a piston ring is close to the upper edge of the gas inlet; the gas inlet valve is opened, pressing of the fresh air is conducted and the waste gas is discharged further, when the piston continues to move down to the gas inlet and the piston is communicated with the inner cavity of the cylinder sleeve on the upper portion of the piston; and before the piston moves up and the piston ring is close to the upper edge of the gas inlet, the exhaust valve is closed firstly and the gas inlet valve is closed later. The gas inlet valve which is arranged at a position of the gas inlet channel is provided with the gas inlet opening. Even though the piston is far away from the gas inlet during the moving process, no fresh air leaks into a machine cavity on the lower portion through the gas inlet, the piston is not required to be lengthened and can moves a position which is far away from the gas inlet, and the stroke of the piston is increased greatly.

A crankshaft (1) for a reciprocating piston engine (10) or compressor. The crankshaft (1) has a plurality of throws (2) that are interconnected by main journals. The main journals (5) have a main journal bearing surface with a given width (W) between the two axial ends of (42,43) of said main journal bearing surface (40). At least one receding area (45) is provided in the main journal bearing surface (40) of at least one of the main journals (5). The at least one receding area (45) adjoins one of the two axial ends (42,43) and the receding area (45) has a depth (y) that generally decreases in the axial direction away from the one of the two axial ends (42,43) that the receding area (45) adjoins. A bearing assembly with a plurality of main bearings (62,80,86,87) and a crankshaft (1) as above. A large multi-cylinder two-stroke diesel engine of the crosshead type or a large compressor of the crosshead type with a crankshaft as above or with or a bearing assembly as above.