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 gas inlet buffer applied to a two-stroke high power-to-weight-ratio heavy oil piston engine and a design method thereof. The buffer is located between a scavenging pump outlet and an air cylinder gas inlet, the whole buffer is a group of cuboid-shaped accommodating cavities, and no other mechanical and moving parts exist in the buffer; and through structure design of the structural section of multiple groups of accommodating cavities, pollution to fresh air in an air inlet by backflow fuel gas in an air cylinder can be effectively controlled by the engine during scavenging, the backflow fuel gas is pushed into the air cylinder again, scavenging efficiency is higher, the scavenging coefficient is greater, and the total work of each time of circulation of the engine is larger.

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 provides a miniature free piston generator with a compound combustion chamber structure. The miniature free piston generator comprises a hydraulic cylinder and a temperature difference power generation device; a first miniature free piston power device is located on an axis of a machine body, and a plurality of second miniature free piston power devices are uniformly distributed in the circumferential direction of the axis of the machine body; a plurality of air inlets and a generator exhaust port are formed in the machine body, and the exhaust port of the generator communicateswith an inner cavity of the machine body; the hydraulic cylinder comprises a first piston rod, a second piston rod and a hydraulic cavity, wherein the hydraulic cavity is connected with the machine body, the first piston rod and the plurality of second piston rods are arranged in the hydraulic cavity, and a piston body of the first miniature free piston power device is in linkage with the first piston rod; piston bodies of the second miniature free piston power devices are in linkage with a second piston rod; and the temperature difference power generation device is arranged in the machine body. According to the generator, mechanical energy of piston movement can be directly converted into electric energy so as to obtain a relatively high energy conversion rate; and preheating is carried out on the mixed incoming air by utilizing high-temperature waste gas.

The invention discloses a crankshaft assembly, which includes a crankshaft and a filler, and the filler is connected to the crankshaft through an interference connection, so that the filler and the crankshaft are connected as a whole; the filler is fixed to the crankshaft through an interference connection In addition, it not only has a simple and compact structure, but also reduces the number of parts assembled, thereby improving assembly efficiency, reducing the weight of the crankshaft assembly, thereby reducing the rotational inertia force of the crankshaft, and saving production costs; The above-mentioned crankshaft assembly is installed on the engine, thereby reducing the overall mass of the engine, realizing a lightweight design, and improving the scavenging efficiency of the engine cylinder block, thereby improving the performance of the engine, reducing production costs, and improving market competitiveness .

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.

The invention discloses a scavenging system of a two-stroke engine. The system comprises a cylinder provided with a combustion acting chamber, a crankshaft box provided with a crankshaft chamber, a piston and a crankshaft assembly, wherein a fresh mixed air inlet and an exhausting port are formed in the cylinder; a thick mixed air scavenging channel and a thin mixed air scavenging channel are arranged in the crankshaft chamber; the thick mixed air scavenging channel is provided with a first air inlet and a first air outlet; the thin mixed air scavenging channel is provided with a second air inlet and a second air outlet; the thick mixed air scavenging channel and the thin mixed air scavenging channel are arc-shaped and clung to the inner walls of two sides of the crankshaft chamber; a first scavenging port and a second scavenging port are formed in the combustion acting chamber; the first scavenging port is far away from the exhausting port and communicates with the first air outlet; the second scavenging port is close to the exhausting port and communicates with the second exhausting port; a first oil stopping rib and a second oil stopping rib are correspondingly arranged on the thick mixed air scavenging channel and the thin mixed air scavenging channel. According to the system, a layered scavenging state can be formed, so that the content of harmful components in exhaust gas can be reduced, and as a result, the environment can be protected; the consumption of oil in use can be saved.