Carburetor with air passage

Abstract

The invention relates to a carburetor with an air channel. The carburetor body is provided with a main channel of the carburetor running through the front and rear side walls of the carburetor. The two ends of the main channel of the carburetor are respectively provided with a throttle butterfly valve and a choke valve. Butterfly valve, the left side wall of the carburetor body is respectively provided with a throttle rocker arm and a choke rocker arm, the throttle rocker arm is connected with the throttle butterfly valve, the choke rocker arm is connected with the choke butterfly valve, and the throttle rocker arm is set on On one side of the choke rocker arm, the front side of the carburetor body is fixed with an intake elbow, on which the carburetor body and air passage device are installed, and the air passage device is connected with the throttle rocker arm through a linkage rod , when the rocker arm of the throttle valve is rotated, the opening and closing of the air channel device is driven by the linkage rod. The advantages are: the fuel mixture of the engine is fully combusted, the exhaust gas generated by combustion is discharged cleanly, the amount of unburned mixture gas can be reduced, the fuel consumption rate is low, the cost of the machine is low, and because the mixture gas is fully burned, the unburned mixture gas is prevented escape.

Description

technical field [0001] The invention relates to the technical field of engine accessories, in particular to a carburetor with air passages. Background technique [0002] At present, countries such as Europe and the United States have limited requirements on the emission value of gasoline engine exhaust pollutants. The sum of THC and NOx in the exhaust of two-stroke hand-held garden tools less than 50CC shall not exceed 50g / kW.h. The second stage of the national emission limit standard is also It is being prepared for implementation. In the past ten years, countries around the world have been researching new engine technologies to meet the requirements of upgrading emission standards and stricter emission limits at different stages. Most of the engines of hand-held garden tools such as chainsaws and brush cutters on the market use small two-stroke gasoline engines, and some engines use butterfly valve diaphragm carburetors. However, butterfly valve diaphragm carburetors and ...

AI Technical Summary

Problems solved by technology

From the perspective of the piston valve control method, the scavenging and exhaust timings overlap, that is, the exhaust port opens in front of the scavenging port and closes behind the scavenging port, and the exhaust port closes after a period of time after the scavenging is completed. To avoid, when the exhaust gas is discharged from the exhaust port, the mixed gas is swept into the combustion chamber, and the mixed gas and the edge of the exhaust gas are mixed together, which is easy to cause exhaust gas to be exhausted or part of the unburned mixed gas to be discharged, which will affect the normal power of the engine. Or cause fuel waste, plus a certain proportion of engine oil is added to the gasoline fuel used by the two-stroke engine, the sum of THC and NOx in exhaust emissions is above 100g / kW.h

[0005] Using the existing carburetor, if the exhaust gas generated by the engine is directly discharged, the pollutant content in the exhaust cannot meet the limit requirements

In order to meet the emission requirements, lean combustion technology and secondary purification technology are generally used. However, after using these two technologies, the overall performance of the engine will be reduced, and the following defects will appear: due to the lean combustion of the engine in pursuit of combustion efficiency, a leaner mixture is required Gas, the engine is relatively difficult to ignite, the combustion is unstable, the starting performance and acceleration performance of the engine are deteriorated, and the output power of the engine is reduced; at the same time, the exhaust gas discharged from the engine is subjected to secondary purification treatment to increase the amount of catalyst used, increase the volume of the muffler, and the muffler Add protective devices around, purification treatment brings cost increase, and more importantly, engine temperature rises due to purification treatment, and the temperature rise is relatively large, often reaching or exceeding the engine operating limit temperature, and the working condition deteriorates, which directly affects the service life of the engine

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