43results about How to "Improve scavenging efficiency" patented technology

The invention discloses a height adjustment device for a gas port of an internal-combustion engine. The gas port is formed in the sidewall of a cylinder. The height adjustment device comprises a drivepart, a speed reduction assembly, a height adjustment part, a controller and a position sensor, wherein an output end of the drive part is connected with an input end of the speed reduction assembly,and an output end of the speed reduction assembly is a turbine; the height adjustment part comprises an adjustment rod and a sleeve, one end of the adjustment rod is connected with the center of theturbine, the other end of the adjustment rod is connected with an adjustment part, and the adjustment part is arranged in a manner of deflecting from the position of the central axis of the adjustmentrod; the sleeve sleeves a part close to the gas port, of the outer sidewall of the cylinder, and is slidably connected with the outer sidewall of the cylinder, a connection element is arranged on theouter sidewall of the sleeve, and the adjustment part is slidably connected with the connection element; the controller is electrically connected with the drive part; the position sensor is arrangedat a shaft end of the turbine, acquires the position of the sleeve and transmits the position information to the controller; and the controller converts eccentric rotation of the adjustment rod to linear movement of the sleeve, and then realizes adjustment for the height of the gas port.

The invention discloses a high compression ratio two-stroke gasoline compression ignition device and a control method. The stroke length of an air cylinder of the device is 90mm-110mm; a fuel injector and an electric heating plug are separately mounted on the top of the air cylinder; five scavenging ducts are separately formed in the side wall of a crankcase; the lower port of each scavenging duct communicates with the crankcase and communicates with the gas cylinder; a scavenging duct valve is mounted at the lower port of the fifth scavenging duct; a gas inlet is formed in the side wall of the crankcase, and a gas inlet pipe communicates with the crankcase; a gas compressor, a gas inlet control valve, an intercooler and a reed valve are successively mounted on the gas inlet pipe along the gas inlet direction; one end of a gas inlet by-pass pipe is connected to a gas inlet pipe between a turbine motor and the intercooler while the other end is connected to a gas inlet pipe between the intercooler and the reed valve; and an exhaust recycling pipe communicates between the outlet port of an exhaust pipe and the inlet port of the gas inlet pipe. The power is improved, and the oil consumption and discharge are reduced.

The invention provides an HCCI micro free piston electric generator. The HCCI micro free piston electric generator comprises a stator and micro free piston power devices. The stator is provided with amain air inlet, the stator is divided into stator work units through the main air inlet, the stator work units are symmetrically distributed and are of the same structure, fixed dividing rings are arranged in the stator work units, the micro free piston power devices are arranged in the stator work units, a work chamber comprises a combustion chamber and a pressure chamber, the pressure chamber is communicated with the main air inlet, a combustion chamber air inlet and a combustion chamber exhaust opening are formed in the combustion chamber, a pressure chamber air inlet is formed in the pressure chamber, the pressure chamber air inlet and the combustion chamber air inlet are connected through a pipeline, a one-way valve is arranged on the main air inlet, and an exciting winding and a stator winding are arranged on the inner wall of each stator work unit. Mechanical energy is directly converted into electric energy, waste gas waste heat is used for preheating mixed gas, the initial temperature of the mixed gas is improved, and compression combustion of the mixed gas is facilitated.

The invention provides a layered scavenging two-stroke gasoline engine, and belongs to the technical field of gasoline engines. According to the layered scavenging two-stroke gasoline engine, a semi-closed inner channel is formed in a piston. When the piston ascends in a cylinder body, the air is stored in the semi-closed inner channel from an air inlet channel in advance, and then enters scavenging channels, mixed gas enters the scavenging channels from a mixed gas inlet channel afterwards, and therefore when scavenging operation is conducted, a large amount of air is scavenged in advance, then the mixed gas is scavenged, and the quantity of the mixed gas is greatly reduced. In addition, due to the facts that the scavenging channels on the two sides of the cylinder body are of an asymmetric structure, and are different in structure, paths are different, the gas has different flowing performance in the scavenging channels of the cylinder body, and vortexes are generated when the gas flows into a combustion chamber, the scavenging efficiency is greatly improved, and emission of compounds such as HC and CO in exhaust gas is reduced.

The invention aims to provide an internal combustion engine equipped with a scavenging control valve, in which blow-by of combustion gas from the upper annular space above the top piston ring to the scavenging ports is prevented by which reduction in engine performance due to deposition of combustion gas residuum to the scavenge openings and occurrence of piston ring sticking due to deposition of combustion gas residuum to the piston rings can be prevented, and further the amount of working oil to drive the scavenging control valve can be reduced resulting in decreased energy loss for pressurizing the working oil. An annular-shaped scavenging control valve is fitted-in to a fitting face formed on the inner side of the cylinder liner movably in circumferential direction of the cylinder liner for opening and closing said scavenging ports in order to allow scavenge air to be supplied into the cylinder or interrupted, said scavenging control valve has a plurality of scavenge openings arranged along circumferential direction and in a plurality of stages in axial direction thereof so that the scavenge openings are brought into communication or discommunication with the scavenging ports of the cylinder liner by moving the scavenging control valve in circumferential direction thereof, and the scavenge openings of each stage has a height L1 which is smaller than a inside distance L2 between a top piston ring and a bottom piston ring equipped to a piston of the engine as shown in.

The invention discloses an exhaust valve structure for a low-speed two-stroke marine diesel engine. The scheme is as follows: the exhaust valve is provided with an exhaust flow passage, and the inlet of the exhaust passage is arranged on the bottom surface of the exhaust valve; the outlet is arranged on the sealing surface of the exhaust valve. The exhaust runners are arranged circumferentially along the central axis of the exhaust valve. The flow channel can choose a single-ring or double-ring structure, and the angle α between the centerline of the single-ring exhaust flow channel and the horizontal plane is 20° to 40°. The double-ring layout structure is divided into inner ring and outer ring, the inner ring flow path angle α is 20°-40°; the outer ring flow path angle α' is 30°-50°. The angle β between the centerlines of all exhaust runners and the centerline of the exhaust valve projected onto the horizontal plane is 10°-20°. By setting the exhaust flow channel between the bottom surface of the valve and the sealing surface, the residual exhaust gas accumulated in the exhaust gas accumulation area under the valve is effectively eliminated, and the scavenging efficiency can be obviously improved. Through the design of different structural angles of the exhaust flow channel, the flow resistance of the exhaust gas is minimized, and the working performance of the diesel engine is improved.