Starting device for enriching-valve type carburetor

Abstract

The invention discloses a starting device for an enriching-valve type carburetor, comprising an enriching valve which is arranged on the enriching-valve type carburetor. A control valve is arranged on the enriching valve; a starting plunger and an oil needle are arranged on the control valve and are respectively inserted in a plunger cavity of the enriching valve and an enriching oil supplying channel; the starting plunger and the oil needle can move along the axis of the plunger cavity of the enriching valve and the enriching oil supplying channel; and a gas inlet and an mixed gas outlet are arranged on the plunger cavity of the enriching valve, wherein the gas inlet is directly communicated with the air through a channel except an engine gas inlet system, With the design, the starting device can start the motorcycle in the high-temperature environment, thereby effectively solving the problem that the motorcycle is difficult to start in the high-temperature environment. The starting device can be matched with the system without being affected in the starting performance in the high-temperature environment, and the starting device can be widely applied to the enriching-valve type carburetor.

Description

technical field [0001] The invention relates to a starting device for a carburetor, in particular to a starting device for an enrichment valve type carburetor for a motorcycle. Background technique [0002] At present, the enrichment valve of the carburetor starting system takes air from the pipeline of the engine intake system and mixes it with the fuel in the fuel supply channel in the enrichment valve body, so as to provide the engine with a richer mixture when starting from cold. In order to facilitate the cold car to start smoothly. A kind of existing structure is: the enrichment valve body is arranged on the carburetor body, the enrichment valve body is equipped with an electronic valve, and the electronic valve is provided with a starting plunger and an oil needle at the lower end of the starting plunger, the starting plunger and the oil needle. The needle is coaxial, the starting plunger and the oil needle are respectively inserted into the plunger chamber 21 of the...

AI Technical Summary

Problems solved by technology

The air intake port 23 communicates with the mixing chamber at the front end of the throat pipe on the carburetor body through the air intake chamber 26 and the air passage connected to the chamber, and takes air in the engine air intake system pipeline, so it is connected to the enrichment valve and the carburetor. On the body of the oiler, it is necessary to process a vent hole communicating with the intake system pipe; in order to machine the intake port 23 on the plunger cavity 21, a process coaxial with the intake port 23 must be processed on the outer wall of the enrichment valve 2 Hole 25, the process hole 25 connects the air intake cavity 26, after the air intake 23 is machined, the process hole 25 is blocked with a plug 27, so the manufacturing is more complicated

Because the enrichment valve of the existing carburetor starting system takes air in the engine intake system pipeline, it has caused serious defects: when the motorcycle is stopped after working or the ambient temperature is high, the heat radiation will make the interior of the carburetor and The gasoline on the wall surface of the intake port evaporates, and the oil vapor is not easy to escape due to the long pipeline of the engine intake system, so it remains in the intake pipeline; after parking, the electronic valve is not energized, the PTC heating element cools down, the paraffin shrinks, and the starting column Lifting the plug will open the enrichment oil circuit and air passage for starting, and provide a richer mixture gas when starting; in addition, the carbon tank of the fuel evaporation system also absorbs more oil vapor under high temperature environment, and the engine starts under negative pressure. Under the action, the oil vapor in the carbon tank will be desorbed, and the mixture will also become rich; under the action of the above factors, the mixture will be too rich when the engine is started, and it cannot be started normally.

[0004] ①Increase the accelerator when starting, take in more fresh air, and keep the air-fuel ratio in the flammable range; but this operation is more dangerous and may cause life danger to the user

[0005] ②The carburetor adopts dual atmospheric balance pipes, so that the oil vapor in the carburetor evaporates directly into the atmosphere and does not enter the intake system pipeline; Evaporate directly into the atmosphere directly, so it is difficult to meet the fuel evaporative emission regulations

[0006] ③ Open holes in the air intake system pipeline to let the oil vapor out, but it is not good for the engine air intake dust resistance, water resistance, mud resistance, fuel evaporation and emission regulations, etc.

[0007] ④Set the enrichment valve of the carburetor to be a bit thinner, but the low-temperature starting performance is not good

[0008] Thereby also do not have a kind of technical scheme that can really effectively solve this problem

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