Carburetor with air channel

Abstract

The invention relates to a carburetor with an air channel. A carburetor body is provided with a carburetor main channel penetrating the front and rear side walls of the carburetor body, two ends of the carburetor main channel are respectively provided with a throttle valve butterfly valve and a choke valve butterfly valve, the left side wall of the carburetor body is respectively provided with a throttle valve rocker and a choke valve rocker, the throttle valve rocker is connected with the throttle valve butterfly valve, the choke valve rocker is connected with the choke valve butterfly valve, and the throttle valve rocker is arranged on one side of the choke valve rocker. An air inlet bent pipe is fixed on the front side of the carburetor body, the carburetor body and the air channel device are installed on the air inlet bent pipe, the air channel device is connected with the throttle valve rocker through a linkage rod, and the throttle valve rocker drives the air channel device to be started and shut down through the linkage rod during rotation. The carburetor with the air channel has the advantages that engine fuel mixed gas is fully combusted, waste gas produced during combustion is completely discharged, the discharging amount of the non-combusted mixed gas can be decreased, the fuel consumption rate is low, the machine using cost is low, and the non-combusted mixed gas is prevented from being leaked due to the fact the mixed gas is fully combusted.

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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