CN211573638U

CN211573638U - Prepressing direct-injection type two-stroke multi-cylinder engine

Info

Publication number: CN211573638U
Application number: CN201921905486.8U
Authority: CN
Inventors: 王明中
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-09-25
Anticipated expiration: 2029-10-31

Abstract

The utility model relates to the field of engines, in particular to a prepressing direct injection type two-stroke multi-cylinder engine, when the prepressing direct injection type two-stroke multi-cylinder engine works, air is compressed by a rotary vane compressor and then enters the inside of a crankcase, when a piston moves downwards to an air inlet of the air cylinder, compressed air in the crankcase enters the air cylinder through the air inlet of the air cylinder, the piston moves upwards to close the air inlet of the air cylinder and then compresses the air in the air cylinder, an electric control fuel injector sprays high-pressure fuel into the air cylinder in a mist shape when the piston is close to a top dead center, the fuel is ignited by an igniter and burns to do work and pushes the piston to move downwards, when the piston moves downwards to the position 2 mm at the upper end of the air inlet, an exhaust valve is opened, waste gas is discharged out of the engine through the exhaust valve, when the piston continues, at the moment, pure compressed air is exchanged into the cylinder, so that the working processes of air intake, compression, work application and air exchange are realized.

Description

Prepressing direct-injection type two-stroke multi-cylinder engine

Technical Field

The utility model belongs to the technical field of the engine and specifically relates to a two-stroke engine.

Background

The fuel engine has been popularized in vehicles, but the traditional four-stroke engine needs to perform four working strokes of air suction, compression, work, exhaust and the like, and the main shaft only works once per two revolutions, so the work efficiency is low, the prior two-stroke engine adopts the working mode that a plurality of air inlet and exhaust ports are arranged on a cylinder, a piston sweeps each air hole to control the opening and closing of an air valve, the entering combustible mixed gas is pre-compressed by a crankcase and then enters the cylinder to perform air exchange action, but the air inlet and the exhaust port are arranged at the lower end of the cylinder in the structure, the air at the upper end of the cylinder cannot be completely discharged during the exhaust action, so the working efficiency of the next air suction and combustion is influenced, the pre-compressed air in the crankcase needs to be utilized for auxiliary air exchange during the exhaust, the crankcase sucks the combustible mixed gas by the negative pressure generated by the upward movement of the piston during, when the piston moves downwards to pre-compress the air in the crankcase, the volume in the crankcase buffers the air, so the pressure of air compression is lower, low-pressure air can not effectively enter the cylinder in a short time when the engine runs at a high speed, the efficiency of auxiliary exhaust and ventilation is limited, combustible mixed gas is sucked in the crankcase, when the combustible mixed gas is used for auxiliary exhaust of waste gas in the cylinder, a part of mixed gas can be discharged out of the engine along with the waste gas, so the direct emission of fuel oil pollutes the environment, moving parts such as the piston, the cylinder, a crankshaft and the like are lubricated by the combustible mixed gas, the lubricating efficiency is lower, the engine can not work for a long time, lubricating oil can pollute the air after being combusted in the cylinder, and each group of crankcases can only pre-compress and ventilate one group of pistons, the ventilation mode cannot be applied to a multi-cylinder engine, so that the traditional two-stroke engine can be only applied to a small amount of places such as chain saws and the like which need small volume and large power.

Disclosure of Invention

In order to solve the defects of the prior two-stroke engine, the utility model provides a prepressing direct injection type two-stroke multi-cylinder engine, the engine performs prepressing air supply for a plurality of cylinder bodies by a rotary vane compressor, gas enters the cylinder from an air inlet of the cylinder at the lower end of the cylinder, waste gas after combustion is discharged from an exhaust valve on a cylinder cover, high-pressure air in a crankcase enters the cylinder to perform auxiliary exhaust for the waste gas, high-pressure fuel oil is operated by adopting an electric fuel injector to perform the working mode of direct injection ignition combustion in the cylinder, the top end of each group of cylinders on the engine cylinder cover is provided with an exhaust valve, an electric fuel injector and an igniter, the lower end of the cylinder is provided with the air inlet of the cylinder, the lower end of the air inlet of the cylinder is connected with the crankcase, the rotary vane compressor is arranged on a main shaft outside the engine and keeps synchronous, because the air in the crankcase keeps a certain pressure, when the piston moves downwards to the air inlet of the air cylinder, the compressed air in the crankcase enters the air cylinder from the air inlet of the air cylinder, the air inlet of the air cylinder is closed when the piston moves upwards continuously, the air in the air cylinder is compressed, when the piston approaches the top dead center, the electric control fuel injector sprays high-pressure fuel oil into the air cylinder in a mist form, the fuel oil is ignited by the igniter to do work and push the piston to move downwards, when the piston moves downwards to the position 2 mm away from the upper end of the air inlet, the exhaust valve at the top of the air cylinder is opened under the action of the valve driving system, the high-pressure waste gas combusted in the air cylinder is discharged out of the engine through the exhaust valve, when the piston moves downwards continuously and exposes out of the air inlet of the air cylinder, the compressed air in the crankcase enters the air, when the crankshaft continues to rotate, the exhaust valve is closed, the piston moves upwards to close the air inlet of the cylinder, the piston continues to move upwards to compress the air in the cylinder, so that the next oil injection and ignition program is performed,

drawings

The invention will be explained in further detail below with reference to the drawings,

figure 1 is a schematic diagram of the outline front structure of the device,

figure 2 is a schematic view of the outline back structure of the device,

figure 3 is a schematic diagram of a simulation of the internal structure of the device,

figure 4 is a schematic diagram of the cylinder configuration and intake stroke operation,

figure 5 is a schematic view of the compression stroke operation of the cylinder,

FIG. 6 is a schematic diagram of the injection and ignition operation of the cylinder,

figure 7 is a schematic diagram of the work-producing operation of the cylinder,

figure 8 is a schematic of valve opening and exhaust operation of a cylinder,

figure 9 is a schematic view of the auxiliary scavenging and intake operation of the cylinders,

figure 10 is a schematic view of a rotary vane compressor configuration,

figure 11 is a schematic view of a booster fan configuration,

fig. 12 is a schematic view of a throttle valve structure.

Detailed Description

As can be seen from the figure 1, the upper end of the engine body (1) of the engine is provided with a cylinder cover (2), the position of the cylinder cover corresponding to the inner cylinder is provided with an electric control fuel injector (3) and an igniter (4), the electric control fuel injector and the igniter are respectively connected with a control computer (5) through leads, a plurality of groups of electric control fuel injectors are connected with a high-pressure fuel pipe (6), the control computer controls the opening and closing of the electric control fuel injector to inject fuel in the high-pressure fuel pipe into the cylinder when the engine works, the control computer controls the igniter to ignite and do work, the control computer is connected with a storage battery through leads to obtain a working power supply, a main shaft of the engine is provided with a starting gear (7), the outer side of the starting gear is provided with a belt pulley (8) and a main shaft timing wheel (9), the, the main shaft timing wheel (9) is connected with a valve timing wheel (14) of a valve driving system on a cylinder cover through a timing belt (13), the tooth number ratio of the main shaft timing wheel to the valve timing wheel is 1: 1, a transmission gear of a starting motor (15) is in contact with a starting gear (7) and used for starting an engine, a transmission gear of a lubricating oil pump (16) is in contact with the starting gear, the lubricating oil pump can be driven to work when the starting gear rotates, a starting pressurization fan (17) is arranged on the side face of an engine body, an air outlet of the fan enters a crankcase and used for increasing the pressure of air inside the crankcase when the engine is started, and a rotating blade compressor (18) is arranged at the tail of the engine and used for compressing the air and inputting the air into the crankcase.

As can be seen from figure 2, the rotary vane compressor (18) is installed at the tail end of the engine, the interior of the compressor is composed of a compressor rotor and vanes, the center hole of the compressor rotor is communicated with a power output shaft (27) of the engine, when the engine works, the rotor and the output shaft inside the compressor synchronously rotate and are used for compressing air when the engine works, a throttle valve (19) is arranged on an air inlet pipe of the rotary vane compressor and is used for controlling the air flow entering the compressor, the air inlet end of the throttle valve is connected with an air filter (20) through a pipe, the air outlet end of the rotary vane compressor (18) is connected with a high-pressure air pipe (21), the other end of the high-pressure air pipe is connected with a crankcase of the engine, an air flow meter (22) is arranged on the air inlet pipe of the throttle, the device is used for detecting the opening degree of a throttle valve, an air inlet temperature and pressure sensor (24) is arranged on a high-pressure air pipe and is used for detecting the pressure and temperature of gas input into a crankcase, a gas pressure control switch (25) is arranged on the outer side of the crankcase and is used for controlling the gas pressure in the crankcase, the inlet end of the gas pressure control switch is connected with a storage battery by a lead, the outlet end of the gas pressure control switch is connected with a starting pressurizing fan (17) by a lead and is used for controlling the opening and closing of a working power supply for starting the pressurizing fan, the gas pressure in the crankcase is detected by the gas pressure control switch (25) when an engine is started, the controlled power supply for starting the pressurizing fan is conducted by the pressure control switch when the gas pressure in the crankcase is lower than a set value, the starting pressurizing fan increases the pressure of the air in the crankcase, and the tail end, the electric fuel pump is arranged in the fuel tank and used for compressing fuel input into the electric fuel injector, the electric fuel injector is provided with an oil return pipe and used for returning redundant fuel into the fuel tank, the air flow meter (22), the throttle position sensor (23), the air inlet temperature and pressure sensor (24) and the electric fuel pump (26) are respectively connected with the control computer (5) by leads, the control computer analyzes data input by a plurality of sensors and then controls the fuel injection quantity and the ignition time of the igniter, the control program of the control computer is the same as that of the control computer of the traditional four-stroke direct injection engine, the detector of the control computer can detect and adjust each program or the fault of each sensor, the igniter and the corresponding ignition program are cancelled when the two-stroke engine is applied to a diesel engine, the diesel oil injected into the cylinder is subjected to compression ignition at the high temperature of the compressed gas, and when the compression ratio of the cylinder is increased when the compression ratio is applied to a diesel engine, the compression ignition diesel oil is used for enabling the gas to reach the temperature of compression ignition diesel oil after the piston reaches the top dead center.

As can be seen from FIG. 3, a crankshaft (29) is arranged in a crankcase (28), two ends of the crankshaft are fixedly installed on machine bodies on two sides by a crankshaft bearing (30) and a crankshaft bearing seat (31), the front end of the crankshaft extends out of an engine to be connected with a starting gear (7) and a main shaft timing wheel (9) outside the engine, the rear end of the crankshaft (29) extends out of the engine to form a power output shaft (27), a rotary vane compressor (18) is installed on the power output shaft, the power output shaft (27) penetrates through a central hole of a compressor rotor (32) inside the compressor, when the crankshaft (29) rotates, the rotor inside the compressor can be synchronously driven to rotate, when the rotary vane compressor works, external gas is compressed and then is input into the crankcase (28) by a high-pressure gas pipe, so that the gas inside the crankcase is kept at a set pressure, and a cylinder, a piston (34) is arranged in the cylinder, the piston is connected with a connecting rod sleeve (36) on the crankshaft by a connecting rod (35), the piston in the cylinder can be driven to move up and down when the crankshaft (29) rotates, a cylinder air inlet (37) is arranged at the lower end of the cylinder, the cylinder air inlet is communicated with the inner space of the crankcase, a cylinder cover (2) is arranged at the upper end of the cylinder, an exhaust valve (39) is arranged in the cylinder cover and is matched with a valve rod (40) for opening and closing the exhaust valve, a cam rod (41) is arranged at the upper end of the valve rod, a cam (42) is arranged on the cam rod, a valve pressing rod (43) is arranged at the upper end of the cam rod and the valve rod, one end of the valve pressing rod is contacted with the cam, the other end of the valve pressing rod is contacted with the valve rod, when the position of the cam is changed after the, at the moment, the valve is in an open state, two ends of a cam rod are fixedly arranged on a cylinder cover by utilizing a bearing and a bearing seat, one side of the cam rod extends out of the cylinder cover and then is connected with a valve timing wheel (14), a timing belt (13) connects the valve timing wheel (14) with a main shaft timing wheel (9), when a crankshaft rotates, a cam can be driven to rotate to open and close an exhaust valve, the crankshaft and the cylinders of the engine can be set into 2-8 groups, a cooling chamber (44) is arranged at the outer side of each group of cylinders, the cooling chambers of the multiple groups of cylinders are communicated, a water inlet (45) is arranged on the cooling chamber at one side of the engine, a water outlet (46) is arranged on the cooling chamber at the other side, cooling water enters the cooling chamber from the water inlet during working and then is used for cooling the cylinders, the cooling water heated by the cylinders is discharged, the water temperature sensor is connected with a control computer through a lead and used for detecting the water temperature of the cooling chamber, a transmission gear of the lubricating oil pump (16) is in contact with a starting gear outside the engine, and the lubricating oil pump compresses the lubricating oil and then conveys the lubricating oil to the cylinder cover and other parts needing lubricating through an oil supply pipeline when in work.

As can be seen from FIG. 4, a crankshaft (29) is arranged in a crankcase (28), a cylinder (33) is arranged at the upper end of the crankcase, a piston (34) is arranged in the cylinder, the piston is connected with a connecting rod sleeve (36) on the crankshaft by a connecting rod (35), the piston is driven by the connecting rod to move up and down in the cylinder when the crankshaft rotates, a cylinder air inlet (37) is arranged at the lower end of the cylinder, the lower end of the cylinder air inlet is communicated with the inner space of the crankcase, an oil baffle plate (48) is arranged at the lower end of the cylinder air inlet and used for preventing lubricating oil from entering the cylinder air inlet, a cylinder cover (38) is arranged at the upper end of the cylinder, an exhaust valve (39) is arranged in the cylinder cover, a cam (42) is arranged on a cam rod (41), a valve rod (43) is arranged between the cam rod and the valve rod, the middle part of the valve rod is provided with a pin hole, the valve rod is arranged on the side wall of the cylinder cover by penetrating a positioning pin into the pin hole, when the cam rod rotates, the cam lifts the valve rod, the front end of the valve rod descends and then presses the valve rod into the cylinder, so that the opening of the valve is realized, the valve rod is reset under the action of a valve spring (49) after the cam is separated from the valve rod, the valve is closed at the moment, the outer side of the exhaust valve is connected with an exhaust port (50), waste gas in the cylinder is exhausted out of the engine through the exhaust port, the other side of the exhaust valve on the cylinder cover is provided with an electric control oil injector (3), the electric control oil injector is controlled by a control computer to open and close and is used for injecting high-pressure fuel oil input by a high-pressure oil pipe into the cylinder, one side of the electric control oil, the opening and closing time of the electric control fuel injector and the igniter is detected by a crankshaft position sensor (51) arranged on the side surface inside the crankcase, the crankshaft position sensor is connected with a control computer by a lead, the control computer sends a fuel injection signal to the electric control fuel injector when an induction area on a crank throw handle of the crankshaft is overlapped with the crankshaft position sensor, the control computer immediately sends an ignition signal to the igniter after a fuel injection program is finished, the fuel injection and ignition program of the control computer is the same as the computer program of a traditional four-stroke direct injection engine, the control programs of the control computers of the two engines can be compatible, a cooling chamber (44) is arranged on the outer side of the cylinder and used for cooling the cylinder, a starting pressurizing fan (17) is arranged outside the crankcase and used for enabling the gas pressure inside the crankcase to reach a set value when the engine is started, and a gas pressure, the starting power supply for starting the booster fan is controlled, when the gas pressure in the crankcase is lower than the set value of the gas pressure control switch, the power supply input into the starting booster fan is conducted by the pressure control switch, when the gas pressure in the crankcase reaches the set value, the power supply input into the starting booster fan is disconnected, the high-pressure gas pipe (21) is connected with a rotary vane compressor outside the engine and is used for inputting high-pressure air generated by the compressor into the crankcase, the lower end of the crankcase is provided with a lubricating oil tank (52), one side of the lubricating oil tank is provided with a lubricating oil pump (16), an oil outlet of the lubricating oil pump is connected with a lubricating oil pipe (53) and is used for conveying lubricating oil to rotating parts which need to be lubricated inside the cylinder cover and outside the engine, redundant lubricating oil in the cylinder cover flows back to the lubricating oil tank, the sensor is connected with a control computer by a lead and is used for monitoring the detonation phenomenon generated in the cylinder, when the piston (34) descends in the cylinder (33) to the air inlet (37) of the cylinder when the engine works, the exhaust valve (39) and the air inlet (37) of the cylinder are in an open state, and because the gas in the crankcase keeps a larger pressure state, the high-pressure gas in the crankcase can enter the cylinder from the air inlet (37) of the cylinder at the moment, and the waste gas after combustion in the cylinder is pushed out of the engine from the exhaust valve (39), so that the cylinder is filled with pure high-pressure air.

As can be seen from the graph of FIG. 5, the high-pressure gas entering from the air inlet of the cylinder pushes the waste gas in the cylinder out of the exhaust valve (39) after the cylinder is pushed out of the cylinder, the exhaust valve (39) is closed under the linkage action of the cam (42) and the valve pressing rod (43), the piston (34) moves upwards to close the air inlet (37) of the cylinder, the space in the cylinder (33) is in a sealed state at the moment, the piston is pushed to move upwards in the cylinder to compress the gas in the cylinder when the crankshaft (29) continues to rotate, and the high-pressure gas output by the rotary vane compressor enters the crankcase (28) through the high-pressure gas pipe (21) to keep the gas in.

As can be seen from the graph of FIG. 6, when the crankshaft (29) rotates to push the piston (34) inside the cylinder (33) upwards to approach the top dead center, the crankshaft position sensor (51) contacts with the induction block on the crankshaft throw block, the crankshaft position sensor inputs data into the control computer, the control computer outputs an oil injection signal to the electronic control oil injector (3), the electronic control oil injector injects the fuel oil inside the high-pressure oil pipe into the cylinder after starting, the control computer immediately outputs an ignition signal to the igniter (4) after the oil injection program is finished, the igniter ignites the high-pressure fuel oil mixture by sending electric sparks to the inside of the cylinder by the aid of the spark plug, and when the igniter performs the ignition program, the piston reaches the top dead center in the cylinder.

As can be seen from fig. 7, the volume of the gas is rapidly expanded after the fuel mixture inside the cylinder (33) is ignited by the spark plug, the expanded gas pushes the piston (34) downward, the connecting rod (35) pushes the crankshaft (29) to rotate when the piston moves downward, and the crankshaft converts the thrust force of the gas acting on the piston into the power of rotation, thereby realizing the stroke of doing work.

As can be seen from FIG. 8, when the piston (34) moves downwards to the position 2-5 mm above the air inlet (37) of the cylinder (the position changes according to the diameters of the cylinder and the piston), the exhaust valve (39) is opened under the operation of the cam (42), the valve pressing rod (43) and the valve rod (40), and high-pressure exhaust gas generated after combustion of the mixture in the cylinder (33) is flushed out of the cylinder through the exhaust valve, and the pressure of the exhaust gas in the cylinder is recovered to the normal pressure value.

It can be seen from fig. 9 that the crankshaft continues to rotate under the inertia force generated when the crankshaft rotates to move the piston (34) down to the bottom dead center, the piston exposes the cylinder air inlet (37) at the lower end of the cylinder, at this time, high-pressure air in the crankcase (28) enters the cylinder from the cylinder air inlet to push the residual burnt exhaust gas out of the cylinder, so as to perform the working stroke of air intake and air exchange, after all pure air enters the cylinder, the exhaust valve is closed under the linkage of the cam, after the piston moves up, the cylinder air inlet is closed, and then the air in the cylinder is compressed when the piston moves up, and the cam rotates synchronously with the crankshaft under the linkage of the timing belt and the timing wheel, so that the working stroke of air exchange, air intake, compression and work doing of the engine is realized.

As can be seen from FIG. 10, the rotary vane compressor comprises a compression chamber, a compressor rotor and vanes, the compression chamber (56) has an elliptical volume, the lower end of the compression chamber is provided with a compressor rotor (32), the rotor is provided with 3 sets of vane grooves, the vanes (58) are arranged in the vane grooves, the front end of the compression chamber and the compressor rotor are provided with an air inlet channel (59), the rear end of the compression chamber and the compressor rotor are provided with an exhaust channel (60), the middle part of the compressor rotor (32) is provided with a shaft hole, a power output shaft of an engine penetrates through the shaft hole in the middle part of the compressor rotor and extends out of the compressor, the shaft hole in the middle part of the compressor rotor is in splined connection with a power output shaft of the engine, the compressor rotor (32) is driven by the power output shaft of the engine to rotate when the rotary vane compressor rotor rotates, when the blades slide through the compression chamber (56), the front ends of the blades compress gas in the compression chamber, the rear ends of the blades suck gas outside the compression chamber, the compressed gas is discharged out of the compressor through the exhaust passage (60), and the air inlet volume of an air cylinder in the engine is 3/5 of the compressed air volume of the rotary blade compressor, so that the gas input into the crankcase by the rotary blade compressor can generate air pressure, and the air cylinder consumes the gas in the crankcase, so that the air pressure in the crankcase reaches a set value.

It can be seen from fig. 11 that the starting pressurizing fan is composed of a fan and a spring pressure valve, a direct current motor (62) is arranged on the housing of the fan (61), a compression blade is arranged inside the fan, the compression blade inside the fan is driven by the direct current motor to rotate at high speed to generate high-pressure airflow during operation, a spring pressure valve (63) is arranged inside the air outlet pipe of the fan, the rear end of the spring pressure valve is connected with the crankcase of the engine, the spring pressure valve is composed of a gas sealing sheet and a spring, a spring rod (64) is connected with the middle part of the gas sealing sheet (65), the spring rod is pushed to the upper part of the valve port by the pressure valve spring (66), the gas sealing sheet is kept sealed with the lower end of the valve port by the elasticity of the pressure valve spring, gas pressure is generated inside the air outlet pipe during operation of the fan, and the gas sealing sheet (65) moves to the lower end of the valve port when, the high-pressure gas generated by the fan can enter the crankcase, the spring pressure valve has the limiting function of one-way gas transmission, the gas can push the gas sealing sheet to be pushed away from one side of the fan to enter the crankcase, the gas in the crankcase cannot be discharged from the gas pressure valve when the spring pressure valve is closed, the fan is connected with the storage battery through a lead to obtain a 12V working power supply, the positive electrode of the power supply is controlled by a gas pressure control switch (25), the pressure switch conducts the power supply of the fan when the gas pressure in the crankcase is lower than the set value of the gas pressure control switch, and the power supply of the fan is disconnected when the gas pressure in the crankcase is higher than or reaches the set value.

As can be seen from FIG. 12, a throttle valve 68 is provided in an air passage 67 of the throttle valve, the throttle valve is slidable in a valve tube 69, the air passage 67 is in a maximum open state when moving to a front end of the valve tube, an air flow volume of the air passage is gradually decreased when moving to a rear end, thereby limiting an amount of air input into the rotary vane compressor, a spring groove 70 is provided in a middle portion of the throttle valve 68, a throttle valve spring 71 is provided between the throttle valve and a rear end of the valve tube for pushing the throttle valve to one side of the air passage, a transmission wire 72 is fixed to a rear end of the spring groove 70 after penetrating a wire hole of the valve tube and the throttle valve spring 71, the throttle valve 68 is moved to a left side when the transmission wire is pulled out, thereby controlling an air delivery volume of the air passage, a throttle position sensor 23 is provided in the valve tube, the air flow meter is used for detecting the opening and closing degree of an internal air channel of the throttle valve, an air flow meter (22) is arranged on the air channel at the upper end of the throttle valve and used for detecting the air flow input into an engine, the other end of the transmission steel wire is connected with a rotating speed control mechanism (73), and the opening degree of the throttle valve can be changed by adjusting an adjusting bolt on the rotating speed control mechanism, so that the rotating speed of the engine is adjusted.

When the engine is started, the gas pressure in a crankcase (28) is detected by a gas pressure control switch (25), when the pressure is lower than a set value, the pressure control switch conducts a working power supply for starting a booster fan (17), the gas pressure in the crankcase is quickly increased to the set value after the booster fan is started to work, a starting motor (15) drives a crankshaft to rotate, a rotary vane compressor (18) compresses air and then conveys the air to the crankcase (28) by a high-pressure air pipe (21), a piston (34) descends to the bottom dead center position of a cylinder under the linkage of the crankshaft and a connecting rod, an air inlet (37) of the cylinder is conducted at the moment, the high-pressure gas in the crankcase enters the cylinder from the air inlet of the cylinder, the piston ascends to close the air inlet of the cylinder after the crankshaft continues to rotate, the piston ascends to compress the gas in the cylinder, and a sensing position on a crank throw handle is detected by a crank position sensor (51), the control computer outputs an oil injection signal to the electric control oil injector (3), the electric control oil injector sprays high-pressure fuel oil in a high-pressure oil pipe into the cylinder in a mist form after being started, the control computer outputs an ignition signal to the igniter (4) after an oil injection program is finished, the igniter ignites the fuel oil mixed gas in the cylinder by means of electric sparks generated by the spark plug after being started, the volume of the gas after the mixed gas is combusted is rapidly increased to push the piston to do work downwards, the crankshaft converts the moment of the piston downwards into rotary moment, the exhaust valve (39) is opened under the linkage of the cam (42), the valve rod (43) and the valve rod (40) when the piston descends to the position of 2 mm above the air inlet (37) of the cylinder, high-pressure waste gas after combustion in the cylinder rushes out of the cylinder through the exhaust valve, the piston continues to descend to expose the air inlet of the cylinder, and high-pressure gas in the crankcase, at the moment, pure air is exchanged into the cylinder, so that the working stroke of air exhaust and air exchange is realized, the crankshaft continuously rotates by means of inertia force to enable the piston to move upwards to close the air inlet of the cylinder, the exhaust valve is closed under the linkage of the cam and the valve pressure rod, the air in the cylinder is in a sealed state at the moment, the piston compresses the air after moving upwards continuously, therefore, the working stroke of oil injection, ignition and power application is repeated, the electric fuel pump (26) compresses the fuel oil and inputs the compressed fuel oil into the electric control fuel injector through the high-pressure fuel pipe to realize the action of oil injection, the air inflow entering the rotary vane compressor (18) can be controlled by adjusting the opening degree of the throttle valve so as to change the gas pressure of the crankcase, when the gas pressure entering the cylinder from the air inlet of the cylinder is reduced, the oil injection quantity can be reduced by controlling the computer after data detected by combining a plurality of groups of sensors is input into the control computer, so that the acceleration and deceleration actions of the engine are realized.

The engine supplies air uniformly by the rotary vane compressor, the working stroke of the cylinder only comprises compression and work, the working stroke of air exhaust and air exchange is automatically carried out by high-pressure gas in the crankcase, so the engine can do work outwards once every time the crankshaft rotates for one circle, the traditional four-stroke engine needs four working strokes of air suction, compression, work, air exhaust and the like, and the engine only does work once every time the crankshaft rotates for two circles, so the output power of the two-stroke engine is increased by one half compared with the output power of the traditional four-stroke engine, because the air inlet and the air outlet of the cylinder are in a straight line communication type, all waste gas in the cylinder can be pushed out by compressed air entering from the air inlet when the cylinder exhausts, all pure air is exchanged in the cylinder, the heat value of gas combustion can be increased, and the pure air in the waste gas in the cylinder is pushed when the, therefore, the small amount of pure gas discharged by the exhaust valve has no pollution source, the moving parts in the engine are lubricated by lubricating oil, the engine can run for a long time, the gas in the crankcase keeps a certain pressure for ventilating the cylinder, therefore, the number of the cylinders is not limited, the rotary vane compressor is suitable for the production application of a multi-cylinder engine, the volume of the compressed air generated by the rotary vane compressor is larger than the volume of the cylinders, therefore, the pure air entering the cylinder is in a pressure state, the volume of the air entering the cylinder is larger than the volume of the normal pressure air sucked into the cylinder when the traditional four-stroke engine inhales, and the engine can avoid the vacuum state generated by the air suction of the cylinder of the four-stroke engine when running at high speed, the advantages of turbocharging of a conventional four-stroke engine are thereby achieved, so that the two-stroke engine has the characteristics of operational stability of a conventional four-stroke engine and high power output of a two-stroke engine.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A pre-pressing direct injection type two-stroke multi-cylinder engine is characterized in that; the upper end of a machine body (1) of the engine is provided with a cylinder cover (2), an electric control oil injector (3) and an igniter (4) are arranged on the cylinder cover and at the position corresponding to an internal cylinder, the electric control oil injector and the igniter are respectively connected with a control computer (5) by leads, a plurality of groups of electric control oil injectors are connected with a high-pressure oil pipe (6), the control computer is connected with a storage battery by leads, a starting gear (7) is arranged on a main shaft of the engine, a belt pulley (8) and a main shaft timing wheel (9) are arranged on the outer side of the starting gear, the belt pulley (8) is connected with belt pulleys of a generator (11) and a compressor (12) by a transmission belt (10), the main shaft timing wheel (9) is connected with a valve timing wheel (14) of a valve driving system on the cylinder cover by a timing belt (13), transmission teeth of a starting motor, the side of the engine body is provided with a starting booster fan (17), an air outlet of the starting booster fan enters a crankcase, the tail of the engine is provided with a rotary blade compressor (18), an air inlet pipe of the rotary blade compressor is provided with a throttle valve (19), an air pipe for connecting an air cleaner (20) at an air inlet end of the throttle valve, an exhaust end of the rotary blade compressor (18) is connected with a high-pressure air pipe (21), the other end of the high-pressure air pipe is connected with the crankcase of the engine, the outer side of the crankcase is provided with a gas pressure control switch (25), a wire inlet end of the gas pressure control switch is connected with a storage battery through a wire, a wire outlet end of the gas pressure control switch is connected with the starting booster fan (17) through a wire, the tail end of the high-pressure oil pipe (6) is connected with an electric fuel pump (26), the wire for the electric fuel pump is, the front end of the crankshaft extends out of the engine to be connected with a starting gear (7) outside the engine and a main shaft timing wheel (9), the rear end of the crankshaft (29) extends out of the engine to form a power output shaft (27), the upper end of the crankshaft is provided with a cylinder (33), a piston (34) is arranged in the cylinder and connected with a connecting rod sleeve (36) on the crankshaft through a connecting rod (35), the lower end of the cylinder is provided with a cylinder air inlet (37), the lower end of the cylinder air inlet is communicated with the inner space of a crankcase, the lower end of the cylinder air inlet is provided with an oil baffle plate (48), the upper end of the cylinder is provided with a cylinder cover (2), an exhaust valve (39) is arranged in the cylinder cover, a cam (42) is arranged on a cam rod (41), a valve pressing rod (43) is arranged between the cam rod and the valve rod (40), the front, the middle part of the valve compression bar is provided with a pin hole, a positioning pin penetrates through the pin hole to install the valve compression bar on the side wall of the cylinder cover, a spring (49) is arranged on the valve rod, two ends of the cam rod are fixedly arranged on the cylinder cover by utilizing a bearing and a bearing seat, one side of the cam rod extends out of the cylinder cover and then is connected with a valve timing wheel (14), the outer side of the exhaust valve is connected with an exhaust port (50), the other side of the exhaust valve on the cylinder cover is provided with an electric control oil injector (3), one side of the electric control oil injector is provided with an igniter (4), the lower end of the crankcase is provided with a lubricating oil tank (52), one side of the lubricating oil tank is provided with a lubricating oil pump (16), the oil outlet of the lubricating oil pump is connected with a lubricating oil pipe (53, the other side is equipped with delivery port (46), is equipped with air flowmeter (22) in the intake pipe of throttle valve, is equipped with throttle valve position sensor (23) on the throttle valve, is equipped with inlet air temperature and pressure sensor (24) on the high-pressurepipe, and the inside side of crankcase is equipped with bent axle position sensor (51), is equipped with detonation sensor (55) on the cylinder, is equipped with temperature sensor (47) on the pipeline of delivery port, and the multiunit sensor utilizes signal conductor connection control computer.

2. The pre-compressed direct injection two-stroke multi-cylinder engine of claim 1, characterized in that; the starting pressurization fan is composed of a fan and a spring pressure valve, a direct current motor (62) is arranged on a shell of the fan (61), a compression blade is arranged inside the fan, the spring pressure valve (63) is arranged inside an air outlet pipe of the fan, the rear end of the spring pressure valve is connected with a crankcase of an engine, a spring rod (64) is connected with the middle of a gas sealing sheet (65), the spring (66) of the pressure valve pushes the spring rod to the upper side of a valve port, and the gas sealing sheet is kept sealed with the lower end of the valve port by means of the elasticity of the spring of the pressure valve.

3. The pre-compressed direct injection two-stroke multi-cylinder engine of claim 1, characterized in that; be equipped with throttle valve (68) on the gas passage (67) of throttle valve, the throttle valve can slide in valve pipe (69) inside, the middle part of throttle valve (68) is equipped with spring groove (70), throttle valve spring (71) set up between throttle valve and valve pipe tail end, the steel wire hole that transmission steel wire (72) penetrated on the valve pipe and throttle valve spring (71) after-fixing at the tail end of spring groove (70), be equipped with throttle valve position sensor (23) on the valve pipe, be equipped with air flowmeter (22) on the gas passage of throttle valve upper end, rotational speed control mechanism (73) is connected to the other end of transmission steel wire.

4. The pre-compressed direct injection two-stroke multi-cylinder engine of claim 1, characterized in that; rotatory blade compressor is by the compression chamber, compressor rotor and blade are constituteed, compression chamber (56) are oval volume, the lower extreme of compression chamber is equipped with compressor rotor (32), be equipped with 3 groups blade grooves on the rotor, blade inslot portion is equipped with blade (58), the compression chamber front end is equipped with intake duct (59) with compressor rotor's position, the compression chamber rear end is equipped with exhaust passage (60) with compressor rotor's position, compressor rotor (32) middle part is equipped with the shaft hole, extend behind the power output shaft of engine penetrating the shaft hole at compressor rotor middle part and stretch out the compressor, the shaft hole at compressor rotor middle part is splined connection with the power output shaft's of engine contact mode.

5. The pre-compressed direct injection two-stroke multi-cylinder engine of claim 1, characterized in that; the air inlet volume of the cylinder in the engine is 5-3 of the compressed air volume of the rotary vane compressor.

6. The pre-compressed direct injection two-stroke multi-cylinder engine of claim 1, characterized in that; the rotation ratio of the crankshaft to the cam rod is 1: 1.

7. The pre-compressed direct injection two-stroke multi-cylinder engine of claim 1, characterized in that; the exhaust valve (39) is opened at a position where the piston descends within the cylinder to the upper end of the cylinder intake port by 2 to 5 mm.

8. The pre-compressed direct injection two-stroke multi-cylinder engine of claim 1, characterized in that; the tooth number ratio of the main shaft timing wheel to the valve timing wheel is 1: 1.

9. The pre-compressed direct injection two-stroke multi-cylinder engine of claim 1, characterized in that; when the prepressing direct injection type two-stroke multi-cylinder engine is applied to a diesel engine, an igniter and a corresponding ignition program are cancelled, the control program of a control computer is the same as the program of a control computer of a traditional four-stroke direct injection type engine, and the control programs of the control computers of the two engines can be compatible.