336 results about "Scavenging" patented technology

The invention discloses a two-stroke stratified scavenging engine mainly comprising an air scavenging part and a mixed gas scavenging part. The air scavenging part mainly comprises an air storage chamber (10) and an air scavenging passage (15); two ends of the air scavenging passage (15) are communicated with an air scavenging orifice (16) arranged in the inner wall of one side of a cylinder block (2) and the air storage chamber (10); the mixed gas scavenging part mainly comprises mixed gas scavenging passages (17 and 19); the mixed gas scavenging passages are hollow passages formed by the outer surface of a piston (6) and grooves arranged in the inner wall of the cylinder block (2); two ends of the mixed gas scavenging passages (17 and 19) are communicated with mixed gas scavenging orifices (18 and 20) arranged in a cylinder (3) and a crankcase (5). The technical scheme of stratified scavenging with the independent air scavenging passages is provided, short-circuit loss of fresh mixed gas is greatly reduced, and harmful emission of the engine is reduced.

The invention discloses a two-stroke engine capable of scavenging in an air pilot mode, which is characterized in that a cylinder is symmetrically provided with a closed-structure scavenging duct; the structure is realized by symmetrically arranging side covers on two sides of the cylinder; one side of the scavenging duct of the cylinder is connected with an air storage cavity; one check valve combination is positioned between the air storage cavity and an admission pipe; a carburettor and the admission pipe are respectively provided with two relatively-independent inlet paths; a case is provided with a case scavenging duct; the case scavenging duct causes a crank chamber to be communicated with a cylinder scavenging duct by the main bearing ball gap of a crank case; flammable mixed gas in the crank chamber is fully mixed when passing through a bearing hole ball which rotates at high speed and is burnt more fully; and fresh air in the air storage chamber is pressed into the cylinder by the pre-compressed flammable mixed gas when scavenging to scavenge firstly. The two-stroke engine can improve fuel pulverization, improves combustion efficiency, effectively lowers harmful ingredients, such as HC, CO and the like in tail gas, and improves the economical efficiency of the engine.

The invention relates to energy conservation and emission reduction, and belongs to a petrol engine for turbulence reversing emission reducing of a logarithmic differentiation isogonal line skirt edge of a piston skirt. In order to pursue scientific exploration, various improvements of spark plugs, such as adding internal inductive reactance in various fixed electrodes, changing external division couplers, adding casing cooling fins and adding movable and micro-motion electrodes, are provided; the assortment of combustion chambers including a function wave combustion chamber and a function wave combustion chamber with a parabolic convex-concave adapter and various ignition devices is also provided; a double-auxiliary skirt edge is added at the piston skirt; and scavenging air duct openings of a cylinder body are provided, are symmetrically provided with two tapered wedge turbulence reversing pieces (46) on left and right sides, and comprise scavenging air duct openings (47) of the tapered wedge turbulence reversing pieces, tapered wedges (48) leading to the scavenging air duct openings of the tapered wedge turbulence reversing pieces, reversing grates (49) leading to the scavenging air duct openings of the tapered wedge turbulence reversing pieces, and turbulence shields (50) leading to the scavenging air duct openings of the tapered wedge turbulence reversing pieces, so turbulence at the scavenging air duct openings can be conveniently produced to block the reversing of waste gas, and the discharge value can be conveniently reduced to reach the standard. The petrol engine has the benefits that the petrol engine is beneficial to helping guide, emission and noise reduction, and lubricating and heat dissipation, ignition is reliable, and the efficiency is improved.

The invention discloses a method for calculating blown gas displacement of a two-stroke low-speed diesel engine for a boat. The method comprises the following steps: calculating blown gas flow rate, exhausted smoke flow rate and amount of gas discharged to an exhausted smoke collection box in different stages of a ventilation process in real time by adopting a mathematic model; calculating the amount of waste gas freely exhausted in single circulation, gas input and output quantity during a gas blowing process and the amount of exhausted gas during a post-exhausting process by utilizing an ideal gas state equation in combination with a gas distribution phase position; obtaining the blown gas flow rate and the exhausted smoke flow rate according to the quantity and rotating speed of air cylinders of the two-stroke low-speed diesel engine for the boat. The method disclosed by the invention can be used for rapidly and accurately predicting the blown gas flow rate and the exhausted gas flow rate, is high in universality and provides reliable data support for analyzing the working state of the diesel engine and improving the performance of the diesel engine.

The invention relates to a diesel engine and a method for increasing power of a diesel engine. The diesel engine comprises at least one turbocharger stage, at least one exhaust gas aftertreatment system, and a compensation device not driven by the turbocharger stage, wherein the at least one exhaust gas aftertreatment system has a certain number of units for guiding exhaust gas, and the compensation device is at least one auxiliary air blower which is driven independent of the turbocharger stage. According to the invention, the auxiliary air blower is at the downstream of the turbocharger stage, is arranged at a pipeline section at a high pressure side of scavenging gas from the turbocharger stage to a plurality of combustion chambers, and is designed for continuously running in the whole load range of the diesel engine and assisting the turbocharger stages when the combustion chambers are subjected to pressurization, thereby assisting the turbocharger stages to compensate the reduction in the pressure difference used for the turbocharger stages at the high pressure side of the scavenging gas of the turbocharger stages with the exhaust gas aftertreatment when the combustion chambers are subjected to the pressurization.

The invention relates to an internal combustion engine which is provided with at least one cylinder (1) and a device used for recycling the exhaust gas. The cylinder is provided with an working chamber (2) which is limited by a reciprocating piston (3) and is loaded by the scavenging gas comprising compressed gas and fuel. The working chamber is provided with at least one scavenging gas inlet (6), at least one fuel inlet and at least one exhaust gas outlet (5). An exhaust duct (9) is connected with the exhaust gas outlet. A pressure impact (19) is generated in the exhaust duct (9) through the exhaust flowed out from the opened exhaust outlet (5). Through a device used for exhaust recirculation, one part of the exhaust can be used as the recirculation gas for being directly or indirectly guiding into the working chamber (2). Thus the dilution of the recirculation gas by the scavenging gas is prevented and a simple structure is realized. A recirculation gas outlet (21) is leaded out from the exhaust duct (9) connected with the exhaust outlet (5). The recirculation gas outlet can be closed through an attaching valve (22). The valve opens the attaching recirculation gas outlet (21) in an area between increasing and reducing the pressure impact (19) generated in the exhaust duct (9).

The invention discloses a fan two-stroke engine which comprises a contraposition piston two-stroke engine or a uniflow scavenging two-stroke engine, and further comprises an electric fan. An air outlet of the electric fan is arranged in a distribution channel of the contraposition piston two-stroke engine or the uniflow scavenging two-stroke engine. The air erupting direction of the air outlet takes the air flow direction in the distribution channel as overall directing. The fan two-stroke engine leaves out a supercharger, lowers energy consumption of the engine, reduces production cost of the engine, and achieves the normal starting of the contraposition piston two-stroke engine or the uniflow scavenging two-stroke engine.

The invention discloses a two-stroke stratified scavenging gasoline engine which comprises a cylinder body, a crankcase, an air inlet pipe and a carburetor, wherein an air inlet, an exhaust opening, secondary scavenging channels and an air storage chamber are arranged on the cylinder body; the secondary scavenging channels are connected with the air storage chamber; a scavenging opening is formed above each secondary scavenging channel in the air storage chamber; two main scavenging channels are respectively connected to two sides of the cylinder body; an air channel is arranged above the air inlet and is directly connected with an air flowing groove in each main scavenging channel; each air channel is connected with the air storage chamber; the two secondary scavenging channels are symmetric about the center of the cylinder body. Due to the adoption of a scavenging mode of placing air at the front side and placing the mixed gas at the rear side, the contents of harmful components in tail gas can be effectively reduced, the discharge of pollutants is greatly improved, the fuel consumption rate of the engine is effectively reduced, and the fuel economy is improved.

The invention discloses a heat storage combustion device with an annular rotating valve. The device comprises a combustion chamber, a heat storage body, an annular gas separation plate and the annularrotating valve; the annular rotating valve is characterized by comprising an annular intake box, an annular scavenging box, an exhaust box, a rotating valve element and a transmission device; the annular scavenging box is mounted between the annular intake box and the exhaust box; a purging intake ring is mounted at the lower part of a purging sleeve of the purging intake ring of the rotating valve element; the purging intake ring is mounted in the annular scavenging box; a sealing piece is mounted between the purging intake ring and the annular scavenging box; the rotating valve element is rotated to purge cleaning gas into the purging intake ring of the purging intake ring from the annular scavenging box; and the annular intake box and the exhaust box are separated by purging cleaning gas with relatively higher pressure in the annular scavenging box, so that leakage of organic waste gas to be treated into the exhaust box is prevented to the greatest extent.

The present invention relates to a method for operating an injection valve of an internal combustion engine, whereby the metering of fuel is adjustable in particular by varying the stroke of the nozzle needle of the injection valve. Methods and injections valves of this type are generally known from the related art. The aim of the present invention is to provide a method which makes it possible to prevent an incomplete closure of the valve due to soiling (the risk of damage caused by a gasoline-filled cylinder) in operating states of the internal combustion engine in which no complete strokes of the nozzle needle occur over a prolonged period of time and the nozzle is therefore not sufficiently scavenged. According to the present invention, the nozzle is scavenged with fuel when a jammed-open operating state of the nozzle needle is detected.

The invention relates to a cylinder assembly 1 for a longitudinally flushed stroke piston combustion engine and especially to a large-size two-stroke diesel generator moving slowing and flushing longitudinally. The cylinder assembly 1 includes an air cylinder provided with a combustion room 200 and an entrance area 22. A piston 3 moving back and forward long a cylinder axis Z is installed between an upper dead point and a lower dead point in the cylinder 2. And a flushing air entrance 4 is arranged in the cylinder 2 to facilitate to lead the flushing air 4 into the combustion room 200. The cylinder arrangement comprises a piston (3) which is provided as two piece piston. A mantle piston (32) is provided with a piston ring (33), where a main piston (31) is positioned in the mantle piston. A retaining device is provided at a cylinder for the mantle piston. The rinsing air (41) is introduced from an inlet area (22) to a combustion chamber (200) by the rinsing air opening (320) of the mantle piston.

The invention provides an active two-stroke engine crankcase ventilation system. The system is characterized in that an air filter, a supercharger, an air inlet intercooler and an air inlet manifold are connected through the air inlet manifold; the air inlet manifold is communicated with a combustion chamber through an air channel; the air channel is provided with a crankcase; the combustion chamber is communicated with the crankcase; waste gas leaked from the combustion chamber enters the crankcase; a pressure sensor and an oil-gas separator are both arranged on the crankcase; the pressure sensor is connected to an engine control unit through a wire; an air extracting pump is connected to the engine control unit through a wire; the crankcase, the oil-gas separator and the air extracting pump are sequentially connected to an air inlet of the supercharger through a bent through pipeline; the other end of the crankcase is directly connected to an air outlet of the air filter through a bent through pipe; an oil pan is arranged at the lower end of the crankcase; the oil-gas separator is connected to the oil pan and separates engine oil from the oil pan; and the problem that most of the uniflow scavenging two-stroke engine crankcase is in a positive pressure state and cannot meet the requirements of laws and regulations is solved.

An air handling arrangement in a two-stroke cycle, opposed-piston engine with uniflow scavenging and constructed for heavy-duty operation includes sequentially arranged turbochargers in series with asupercharger, in some aspects, the air handling system is equipped with an EGR channel.

A crankcase scavenged two-stroke engine (1) comprises a cylinder (15) including scavenging ports (31, 31′) and at least one exhaust port, a piston (13), a connecting rod (17), a crankshaft (18) and a generally sealed crankcase (16). The crankcase inducts a fuel/air mixture and is connected to the scavenging ports (31, 31′) by means of transfer ducts (3, 3′) which, as the piston (13) is travelling from a lower position towards a higher position, are inducting pure air let in from connecting ports (8, 8′) near the scavenging ports (31, 31′) in the cylinder (15). The transfer duct (3, 3′) volume is less than 20% of a volume swept by the piston (13) during an entire revolution of the crankshaft (18). Recesses (10, 10′) are formed in an outer periphery of the piston (13), said recesses (10, 10′) co-operating with the connecting ports (8, 8′) in the cylinder wall for controlling the filling of the transfer ducts (3, 3′) with air. An inlet tube (22) in the cylinder wall supplies the air/fuel mixture, said inlet tube (22) being connected to the crankcase (16) and covered by the piston (13) as the piston (13) is in the lower position, and open to the crankcase (16) as the piston (13) is in the higher position.

The invention aims to provide a generator cooling system utilizing bypass exhaust gas of a ship diesel engine. The generator cooling system comprises an air heat exchanger and a cooling water heat exchanger, an exhaust pipe of the diesel engine is respectively connected with a first turbine and a second turbine through a bypass valve, a first air compressor is connected with an intercooler, the intercooler is connected with an air blower and is connected with a scavenging box through a first one-way valve, the air blower is connected with the scavenging box through a first electromagnetic valve, and the scavenging box is connected with an air inlet pipe of the diesel engine; and a second air compressor is connected with the air heat exchanger, the air heat exchanger is respectively connected with a second one-way valve and a pressure tank, the pressure tank is connected with a generator through a second electromagnetic valve and an expansion valve, the outlet of a cooling water tank isconnected with the cooling water heat exchanger through a cooling water pump, the cooling water heat exchanger is connected with the generator through a cooling water filter, and the generator is connected with the cooling water tank. According to the generator cooling system, the problem of generator cooling under different working conditions of a diesel generator set can be fully solved, and the efficiency of the generator is improved.

An assembly for a gas turbine engine having: static and rotating components; a seal between the static and rotating components, and between a cavity and an environment outside thereof, the cavity having an inlet fluidly connectable to a source of lubricant and an outlet fluidly connectable to a scavenge pump for drawing lubricant out of the cavity; and a drain conduit having a drain inlet outside the cavity in proximity to the seal for receiving leaked lubricant, and a drain outlet fluidly connected to the outlet of the cavity, the drain outlet located in proximity to a scavenge inlet via which the lubricant exits the cavity to flow toward the scavenge pump such that, in use, a lubricant flow within the drain conduit is entrained by the lubricant exiting the cavity via the scavenge inlet.