CN202300632U - Two-stroke layered scavenging engine - Google Patents

Abstract

The purpose of this utility model is to provide a two-stroke layered scavenging engine, its carburetor is a single-hole rotary valve structure, its appearance and connection method are the same as the carburetor used in ordinary two-stroke gasoline engines, but due to the A horizontal partition is placed in the device to divide the circular intake channel into an air channel and a mixed gas channel, so that it has the function of stratified scavenging. It enters the combustion chamber of the cylinder block for first scavenging, and then the combustible mixture enters the combustion chamber for scavenging, which greatly reduces the escape of unburned combustible mixture, improves the emission of pollutants, and effectively reduces the fuel consumption of the engine. , improve its economic performance, and at the same time, the appearance of the whole machine and the throttle control mechanism do not need to be changed, which seems to be simpler in structure and higher in reliability.

Description

A two-stroke stratified scavenging engine

technical field

The invention relates to the technical field of engines, in particular to a general-purpose small two-stroke stratified scavenging engine. the

Background technique

Two-stroke engines are widely used in many product fields such as agriculture, forestry, gardening, and households due to their remarkable advantages such as compact structure, small size, light weight, and fast operation speed. the

A conventional two-stroke engine is composed of a cylinder block, a piston, a crankshaft connecting rod, a magneto, a carburetor, and other components. The cylinder block is provided with an air intake port, an exhaust port, and a scavenging port, and these air ports are operated by the piston. Open or closed, the fresh combustible mixture used for scavenging during the scavenging process is easily mixed with the burned exhaust gas and discharged without burning or insufficient combustion, so the two-stroke engine not only has high fuel consumption, but also exhaust gas It contains a large amount of harmful components (such as HC and CO), which has a significant impact on air pollution, and also does not meet the requirements of China's existing emission regulations; the current stratified scavenging two-stroke gasoline engine has low emissions and low fuel consumption. It is favored by the majority of consumers, but its air intake system, especially the carburetor, has the disadvantages of complicated structure, poor reliability, and high price of the whole machine. Therefore, for most enterprises, there is an urgent need for a similar Common two-stroke engines are simple in structure, high in reliability, moderate in price, and at the same time have the characteristics of low emission and low fuel consumption. the

Contents of the invention

The purpose of the present invention is to provide a two-stroke stratified scavenging engine, its carburetor is a single-hole rotary valve structure, its appearance and connection mode are consistent with the carburetor used in ordinary two-stroke gasoline engines, but due to the A horizontal partition is placed in the device to divide the circular intake channel into an air channel and a mixed gas channel, so that it has the function of stratified scavenging. The air pressure enters the combustion chamber of the cylinder block for first scavenging, and then the combustible mixture enters the combustion chamber for scavenging, which greatly reduces the escape of unburned combustible mixture, thereby achieving the purpose of reducing the content of harmful components (HC+NOx) in the exhaust gas , greatly improving the emission of pollutants, effectively reducing the fuel consumption rate of the engine, and improving its economic performance; at the same time, because the air channel is closed when the engine is idling, and the mixture channel is opened, the idling speed is stable and the acceleration performance is good. The appearance of the whole machine and the throttle control mechanism do not need to be changed, the structure is simpler, the installation is convenient, and the reliability is higher. the

The technical scheme that the present invention takes is:

A two-stroke stratified scavenging engine comprises a cylinder block, a piston, a spark plug, a carburetor, an air filter, an intake pipe, a reed valve combination, a crankcase combination and a muffler, and is characterized in that the carburetor is a single hole The rotary valve structure is provided with a circular air intake passage and a horizontal partition 1, and the horizontal partition 1 is located above the center of the circular intake passage, separating the intake passage into upper side air passage 1 and Mixed gas channel 1 on the lower side; the air intake channel of the intake pipe is provided with a horizontal partition 2, which is divided into an air channel 2 and a mixed gas channel 2, and the horizontal partition 2 extends toward the carburetor One phase is connected to form a completely separated air channel and mixed gas channel. the

The beneficial effect of the present invention is that due to the use of pure air to scavenge first, the content of pollutants discharged in the exhaust gas can be effectively reduced, and the fuel consumption rate is also greatly reduced. At the same time, the carburetor used in this scheme is The interior of the two-stroke gasoline engine carburetor is slightly improved, and its appearance and connection method are exactly the same. Therefore, the cost of the whole machine is low and the connection is simple. Users can reduce emissions and fuel consumption without changing the appearance. the

Description of drawings

Fig. 1 is a scheme schematic diagram of the present invention

Fig. 2 is the schematic diagram of cylinder body of the present invention

Fig. 3, Fig. 4 are the schematic diagrams of carburetor of the present invention

Fig. 5 is the schematic diagram of intake pipe of the present invention

Description of serial numbers in the accompanying drawings: 1. Air filter; 2. Carburetor; 3. Intake pipe; 4. Reed valve combination; 5. Cylinder block; 6. Spark plug; 7. Piston; Muffler; 10. Air channel; 11. Mixed gas inlet; 12. Air storage cavity; 13. Scavenging port; 14. Scavenging channel; 15. Exhaust port; 16. Plunger; 17. Round inlet Air channel; 18. Air channel one; 19. Mixed gas channel one; 20. Oil needle; 21. Nozzle; 22. Horizontal partition one; 23. Horizontal partition two; 24. Air channel two; 25. Mixed gas channel two. the

Detailed ways

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, the two-stroke stratified scavenging engine of the present invention consists of a cylinder body 5 (air channel 10, air mixture inlet 11, air storage chamber 12 , scavenging air port 13, scavenging air channel 14, exhaust port 15), piston 7, spark plug 6, carburetor 2 (plunger 16, circular air intake channel 17, air channel one 18, mixed gas channel one 19, oil Needle 20, nozzle 21, horizontal partition 1 22), air filter 1, intake pipe 3 (horizontal partition 2 23, air passage 2 24, mixed gas passage 2 25), reed valve combination 4, crankcase combination 8, The silencer 9 is composed of. the

The A side of the carburetor 2 is connected to the air filter 1, the B side is connected to the intake pipe 3, and the horizontal partition 1 22 is connected to the horizontal partition 2 23, and the air passage 18 is connected to the air passage 2 24 , the mixed gas channel one 19 is connected with the mixed gas channel two 25; the other side of the intake pipe 3 is connected with the cylinder block 5 through the reed valve combination 4, when the engine is running normally, the air channel two 24, the mixed gas channel The second 25 communicates with the air channel 10 and the gas mixture inlet 11 respectively. the

An exhaust port 15, a scavenging port 13, a scavenging channel 14, a mixed gas inlet 11, an air storage chamber 12, and an air channel connecting the air storage chamber 12 and the scavenging port 13 are respectively arranged on the cylinder body 5. 10. The exhaust port 15 is arranged on the opposite side of the air inlet 11, and the scavenging air port 13 and the scavenging air passage 14 are arranged in the middle of the exhaust port 15 and the air inlet 11, which can be opened or closed at an appropriate time when the piston 7 moves up and down breath. the

The carburetor 2 is a single-hole rotary valve structure, and a horizontal partition 22 is arranged on the circular air intake passage 17 to divide it into two relatively independent air intake passages. The upper side is an air passage 18, and the lower side It is the gas mixture passage 19, and the horizontal partition 22 is placed above the center of the circular hole and above the fuel injection nozzle 21; the throttle rope is connected to the oil needle 20 through the plunger 16. the

The working process of the two-stroke stratified scavenging engine is as follows:

When pulling the throttle rope to rotate the plunger 16 on the carburetor 2 to raise the oil needle 20, during the upward movement of the piston 7, the mixture gas in the upper part of the cylinder 5 is compressed, and at the same time, a negative pressure is formed inside the crankcase assembly 8. Under the action of atmospheric pressure, the high-speed flowing air inside the mixture channel 19 sucks the fuel out from the fuel injector 21 and quickly atomizes it to form a combustible mixture, which passes through the mixture channel 25 and enters the mixture The port 11 is sucked into the crankcase, and at the same time, pure air enters the air storage chamber 12 on the cylinder block from the first air passage 18, the second air passage 24 and the reed valve combination 4, stores it, and communicates with the scavenging passage 14 The air channel 10 enters near the cylinder body scavenging port 13. When the mixed gas above the piston 7 is ignited by the spark plug 6, it rapidly expands to do work, pushes the piston 7 down, compresses the mixed gas in the crankcase 8, and gradually closes the mixed gas inlet 11 at the same time. When the piston 7 approaches the bottom dead center, The exhaust port 15 is opened, and part of the exhaust gas is discharged into the atmosphere from the exhaust port 15 through the muffler 9. As the piston 7 further descends, the scavenging port 13 is opened, and the compressed combustible mixture passes through the cylinder body scavenging channel 14 to disperse the air. The fresh air in the air storage chamber 12 is pressed into the cylinder body 5 from the scavenging port 13. At this time, the fresh air is in front and the combustible mixture is in the back. Exhaust gas is expelled on the inner wall surface of the cylinder block 5 facing the air port 15, so that the exhaust gas after combustion is discharged from the exhaust port, and the whole process of stratified scavenging is realized. the

When the throttle rope is pulled to make the engine run at idle speed, the air passage one 18 is basically in a closed state, and only the mixture passage one 19 is opened, which can ensure that the engine idle speed is more stable and the acceleration performance is better. the

Through this scavenging method of air in front and mixed gas in the back, the content of harmful components in the exhaust gas, especially the content of HC (hydrocarbons), can be effectively reduced, which greatly improves the emission of pollutants and effectively reduces the exhaust gas content of the engine. fuel consumption and improve fuel economy. the

Claims (1)

1. two-stroke layered scavenging motor; Comprise cylinder body, piston, spark plug, Carburetor, empty filter, suction tude, leaf valve combination, crankcase combination and baffler; It is characterized in that: Carburetor is a single hole rotary valve structure; Be provided with circular gas-entered passageway and horizontal baffle one, said horizontal baffle one is positioned at position on the upper side, said circular gas-entered passageway center, and it is divided into upside air passageways one and downside mixed gas passage one; The gas-entered passageway of suction tude is provided with horizontal baffle two, and it is divided into air passageways two and mixed gas passage two, and said horizontal baffle two stretches out with horizontal baffle one to carburetor side and engages, and forms air passageways and the mixed gas passage separated fully.

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