JPS5823969Y2 - Vaporized fuel collection device for vaporizer - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vaporized fuel collection device for a carburetor of a Ganlin engine.

During operation of the Ganlin engine, fuel adheres to the walls of the intake pipe.

Further, the main nozzle of the vaporizer opens into the ventilation passage.

When the engine is stopped, these fuels evaporate due to engine residual heat and are released into the atmosphere through an air cleaner at the inlet.

Since this evaporated fuel contains harmful components, it is inconvenient for it to be released into the atmosphere in this way.

This invention has been devised in view of this point, and an embodiment of the invention shown in the drawings will be described below.

The carburetor 1 includes a cylindrical throttle valve 3 that is perpendicular to the air passage 2.
is provided, and by sliding the throttle valve 3 upward and pulling it up, the air passage 2 is opened and closed.

Therefore, the present invention provides ventilation holes 5 in the upper and lower walls 4 of the throttle valve 3.
A wire mesh 6 etc. is stretched inside and the canister 7 is placed inside it.
to accommodate.

A slow passage 8 is provided at the lower rear end of the throttle valve 30, and a bypass passage 9 connecting the front part of the ventilation passage 2 and the upper part of the throttle valve 3 is provided.

The outlet of this bypass path 9 is located at a position where it can be closed when the throttle valve 3 is opened wide, and a flow adjustment screw 10 is provided in the middle of the bypass path 9.

11 is an intake pipe leading to the engine, and 12 is an intake pipe leading to the air cleaner side.

Note that the purge pipe 14 of the canister chamber 13 leading to the fuel tank may be connected to the vent passage 20 of the carburetor.

15 is a main nozzle.

The effect will be explained.

When the engine is stopped, the throttle valve 3 moves down and closes the air passage 2.

The evaporative gas of the fuel adhering to the intake pipe 11 is transferred to the slow passage 8.
The fuel passes through the throttle valve 3, enters the lower side of the throttle valve 3, rises together with the fuel evaporated from the main nozzle 15, and is adsorbed by the canister 7.

The purified gas passes through the bypass path 9 and exits to the inlet side of the ventilation path 20.

The same applies to the evaporated fuel from the purge pipe 14 of the canister chamber 13 of the fuel tank.

This prevents harmful components from being released into the atmosphere.

Next, when the engine is restarted, intake air flows through the bypass passage 9 while the opening degree of the throttle valve 3 is small, and the harmful components adsorbed in the canister 7 are removed by the suction force of the engine.
It is separated from the engine and burned by the engine.

As explained above, this invention is provided with a cylindrical throttle valve that is perpendicular to the air passage of the carburetor and slides upward to open and close the air passage. Air holes were provided to accommodate the gannister inside, a slow passage was provided at the lower rear end of the throttle valve, and a bypass passage was provided to connect the front part of the air passage and the upper side of the throttle valve. When the canister is closed, harmful components of evaporated fuel generated from the intake pipe, main nozzle, etc. can be adsorbed into the canister.

Then, when the engine operation is restarted, the adsorbed components in the canister can be released to the engine side, thereby preventing harmful components from being released into the atmosphere.

Furthermore, since the hollow part of the throttle valve is used to house the canister, the canister can be made compact and inexpensive.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, with Figure 1 being a longitudinal sectional view and Figure 2 being a longitudinal sectional view.
The figure is a cross-sectional view taken along the line A-A in FIG. 1... Qihi device, 2... Ventilation path, 3.
... Throttle valve, 4... Upper and lower walls, 5.
...Vent passage, 7...Canister, 8...
... Slow passage, 9... Bypass road.

Claims (1)

[Scope of utility model registration request] In a device equipped with a cylindrical throttle valve that is perpendicular to the air passage of the carburetor and opens and closes the air passage by sliding upward, air holes are provided in the upper and lower walls of the throttle valve and the canister is housed inside. A vaporized fuel collection device for a carburetor, characterized in that a slow passage is provided at the lower rear end of the throttle valve, and a bypass passage is provided that connects the front part of the air passage and the upper side of the throttle valve.