JPS603970Y2 - Fuel extraction device in engine carburetor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device that uses a pump to extract fuel from a carburetor attached to an engine and recovers it in a fuel tank.

For example, in gasoline engines installed in agricultural machinery,
In order to prevent the carburetor jet from clogging due to condensation of impurities contained in the fuel, it is necessary to drain the fuel accumulated in the float chamber of the carburetor when it is not used for a long period of time.

Therefore, the applicant first connected the bottom of the float chamber and the fuel tank with a fuel extraction passage, interposed an electric pump in this fuel extraction passage, and used this pump to forcibly extract fuel from the float chamber to the fuel tank. I thought about making it retrievable.

In order to ensure that fuel can be extracted from the float chamber of the carburetor even if the pump is small, a fuel reservoir is provided between the float chamber and the main jet to delay engine stoppage. The main feature of this system is that the fuel is used to slightly delay the engine from completely stopping when the fuel cock is stopped, and during this time the fuel in the float chamber is drained into the fuel tank using a pump.

Examples of this invention will be described below based on the drawings.

FIG. 1 shows a schematic side view of a gasoline engine, in which fuel is vaporized from a fuel tank 2 placed and fixed on the upper part of the engine body 1 through a fuel supply path (hose) 3, a fuel cock 4, and a fuel drinker 5. It is designed to be supplied to a container 6.

The bottom of the float chamber 7 of the carburetor 6 and the top of the fuel tank 2 are communicated by a fuel extraction passage (hose) 8, and a fuel extraction pump 9 is inserted in the middle of the fuel extraction passage 8.

This pump 9 is driven by a drive controller (DC electric motor) 10, and its control circuit 11 is constructed by connecting a generator 13, a rectifier 14, and a switch 15 in series, which are interlocked and connected to a crankshaft 12. .

Note that when the drive controller 10 is an AC electric motor, the rectifier 14 is not necessary.

This switch 15 is connected to a switching bar 20 of the fuel cock 4.
The lever 20 is turned off when the lever 20 is in the open position, and turned on when the lever 20 is moved to the closed position.

On the other hand, as shown in FIG. 3, between the float chamber 7 of the carburetor 6 and the main jet 16, there is formed a fuel reservoir 17 for delaying engine stop, which is separated from the float chamber 7.

This fuel reservoir 17 has a large diameter communication port 18 at its base.
The lower part thereof is a pore 19 located lower than the main jet 16 and communicates with the float chamber 7 .

While the engine is running, most of the fuel enters the fuel reservoir 17 from the float chamber 7 through the upper communication port 18.

Next, the effect will be explained.

The engine is stopped by operating the switching lever 20 of the fuel cock 4 to the closed position.

That is, this is done by closing the fuel supply path 3 and stopping the supply of fuel to the carburetor 6.

However, since fuel has accumulated in the carburetor 6, the engine does not stop immediately.

At this time, the switch 15 of the control circuit 11 is turned on in conjunction with the lever 20.

Then, while the engine is running, electricity generated by the generator 13 is supplied to the electric motor 10, so the pump 9 is driven, and the fuel in the float chamber 7 passes through the fuel extraction passage 8 to the fuel tank 2. Sent.

The fuel in the float chamber 7 is gradually removed and the float chamber 7
When the oil level of the fuel inside drops below the communication port 18, the only communication between the fuel reservoir 17 and the float chamber 7 is through the pore 19 at the bottom.

Therefore, it is difficult for fuel to flow from the fuel reservoir 17 to the float chamber 7, and as a result, fuel remains only in the fuel reservoir 17.

This fuel gradually flows out into the float chamber 7 through the pores 19 and is collected in the fuel tank 2, and is also sucked into the combustion chamber from the main jet 16 to continue driving the engine.

Then, when the engine is stopped due to fuel shortage, almost no fuel remains in the float chamber 7 of the carburetor 6 and the fuel reservoir 17.

Even if a small amount of fuel remains, the main jet 16
Because it remains at a lower level, that fuel will not condense and clog the main jet 16.

In this way, even if the fuel cock 4 is closed, the engine continues to run as long as there is fuel in the engine stop delay fuel reservoir 17 of the carburetor 6, so electricity generated by the rotation of the crankshaft 12 is used as the drive source. The pump 9 is also activated.

Therefore, even if the pump 9 is small, the fuel in the carburetor 6 can be sufficiently extracted and recovered.

It is possible to modify this idea as follows.

That is, the pump 9 is interlocked and connected to the crankshaft 12 via an electromagnetic clutch.

Then, the control circuit 11 performs electromagnetic clutch control.

This eliminates the need for an electric motor in the embodiment described above, resulting in lower costs.

Since this invention is structured and operates as described above, it produces the following effects.

(a) Since a fuel reservoir for delaying engine stop is provided between the float chamber of the carburetor and the main jet, engine stop is slightly delayed after the engine stop operation is performed using the fuel cock.

Therefore, during this time, fuel can be sufficiently forcibly extracted and recovered from the float chamber of the carburetor into the fuel tank even with a small pump, and clogging of the main jet can be reliably prevented.

This allows the engine to be started quickly even after being stored for a long period of time.

(b) Since the pump can be made smaller, the entire engine can be manufactured lightweight and at low cost.

(c) By closing the fuel cock and cutting off the fuel supply to the carburetor, the switch is turned on and the fuel extraction pump is automatically activated to automatically extract and collect fuel from the carburetor. , never forget to drain and collect fuel.

Furthermore, when the engine completely stops, the generator stops generating electricity and the pump automatically stops, so there is no need to stop the pump.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; FIG. 1 is a schematic side view of the engine, FIG. 2 is a schematic configuration diagram of the fuel system, and FIG. 3 is a longitudinal sectional view of the main parts. 2...fuel tank, 4...fuel cock, 6...carburizer, 7...float chamber,
8...Fuel extraction path, 9...Pump,
10... Drive controller, 11... Control circuit, 12... Crankshaft, 13... Generator, 15... Switch, 16... Main jet, 17... Fuel reservoir, 18...
...Communication port, 19... Pore.

Claims (1)

[Scope of utility model registration request] The bottom of the float chamber 7 of the carburetor 6 is connected to the fuel tank 2 through a fuel extraction passage 8, a fuel extraction pump 9 is interposed in the fuel extraction passage 8, and a control circuit 11 of a drive controller 10 for the pump 9 is connected to a generator. 13 and a switch 15 are inserted, the generator 13 is interlocked and connected to the crankshaft 12, and the switch 15 of the control circuit 11 is interposed in the fuel supply system that communicates the fuel tank 2 and the float chamber 7 of the carburetor 6. The float chamber 7
A fuel reservoir 17 for engine stop delay is interposed between the main jet 16 and the upper part of the fuel reservoir 17 is connected to the float chamber 7 through a communication hole 18, and the lower part thereof is connected to the float chamber 7 through a small hole 19. A fuel extraction device in the engine's carburetor that is configured to communicate with the engine.