JPH0738682Y2 - Automatic Residual Fuel Emission Device for Vaporizer for Two-Cycle Engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a device for automatically discharging residual fuel in a fuel chamber in a carburetor of a two-cycle engine that uses a mixed fuel of gasoline and lubricating oil. .

[Conventional technology]

Conventionally, as described in Japanese Utility Model Laid-Open No. 62-97256 and its main part is shown in FIG. 3, between the fuel chamber b in the carburetor a and the surplus fuel discharge part c, the oil level of the fuel is A string-like body e made of a porous material is provided which is provided with an overflow weir d for determining the height.
One end of the cord-like body e is located at the bottom of the fuel chamber b.
Through the portion adjacent to the weir d at the same height as the upper end of the overflow weir d, and insert the other end downward into the surplus fuel discharge portion c, and mix by the capillary action of the string-like body e. A structure in which fuel is returned to the fuel tank f has been proposed.

[Problems to be Solved by the Invention] The problems of the conventional device in this example are listed below. That is, (a) When the vaporizer a is tilted, the cord-like body e separates from the oil surface and does not suck up the fuel.

(B) The gasoline component of the mixed fuel evaporates quickly,
Only the highly viscous lubricating oil remains in the fuel chamber b, making it difficult to discharge.

(C) The purpose of providing the fuel is to prevent the fuel from corroding, and until it corrodes (usually one month or more).
Has no problem even if it remains in the fuel chamber,
In the method of emptying the fuel chamber in a short time like the conventional example,
If it is to be reused at a relatively early stage, it is inconvenient in that it requires the work of feeding fuel into the fuel chamber again.

The object of the invention of claim 1 is to gradually vaporize and release the residual fuel in the fuel chamber of the vaporizer to the atmosphere. An object of the present invention is to provide an automatic residual fuel discharge device for a carburetor for a two-cycle engine.

An object of the invention of claim 2 is to provide an automatic residual fuel discharge device for a carburetor for a two-cycle engine, which is capable of finely controlling the residual fuel discharge rate.

[Means for Solving the Problems]

The invention will be described using the reference numerals of the drawings corresponding to the embodiments.

A carburetor (10) for a two-cycle engine, which is a premise of the invention of claim 1, has a fuel chamber (16) for storing a fuel (18) led to an intake passage (14). From the bottom (40) of the fuel chamber (16) provided with an overflow weir (34) for holding the oil level of 18), a string-like body or continuous bubbles for discharging residual fuel in the fuel chamber (16) The air emitting body (41) made of the foam is projected.

In the residual fuel automatic discharge device of the vaporizer (10) for a two-cycle engine according to claim 2, the atmosphere emitting body (41) is covered with a cap body (42) provided with a communication port (43) to the outside air. .

[Action]

In the device according to claim 1, the fuel (18) remaining in the fuel chamber (16) due to the stop of the operation of the engine is used to release the fuel (18) to the atmosphere emission body () provided at the bottom (40) of the fuel chamber (16). According to 41), it is gradually released into the atmosphere as paper over a long period of time, and generally, the residual fuel in the fuel chamber (16) is released to the atmosphere over about one month.

In the structure according to claim 2, the discharge speed of the paper is finely controlled by selecting the cross-sectional area of the communication port (43) provided in the cap body (42).

〔Example〕

 The invention will be described below with reference to the illustrated embodiment.

FIG. 1 is a configuration diagram of a carburetor 10 and a fuel circulation system. The carburetor 10 is coupled to a two-cycle engine 12 and is mounted together with the two-cycle engine 12 on a working machine such as a bush cutter and a backpack power spreader. The intake passage 14 is formed in the carburetor 10 and communicates with the crankcase inner space of the two-cycle engine 12. The fuel chamber 16 is provided in the carburetor 10 so as to be located below the intake passage 14, stores the fuel 18, and passes through the main jet 20 and the nozzle hole 22 to form the intake passage.
It communicates with 14. The piston 24 is disposed in the carburetor 10 so as to be slidable in the axial direction of the nozzle hole 22 and is connected to a slottle lever (not shown) via a slottle wire 26. Adjusted. The needle 28 is axially displaced integrally with the piston 24,
The amount of insertion into the nozzle hole 22 is adjusted, whereby
The flow cross-sectional area of the nozzle hole 22, that is, the flow rate of the fuel 18 sucked from the fuel chamber 16 to the intake passage 14 by the bench lily negative pressure is adjusted. The fuel tank 30 is arranged below the carburetor 10 and stores the fuel 18 therein. The fuel pump 32
Fuel in the fuel tank 30 during operation of the two-cycle engine 12
Intake 18 and send it to the fuel chamber 16. Overflow cough 34
In the carburetor 10, the fuel chamber 16 is partitioned from the surplus fuel passage 36, and the fuel chamber 16 and the surplus fuel passage 36 communicate with each other above the overflow weir 34. The surplus fuel hose 38 connects the lower end of the surplus fuel passage 36 and the upper portion of the fuel tank 30, and during operation of the two-cycle engine 12, the fuel overflowing from the upper side of the overflow weir 34 into the surplus fuel passage 36.
18 is returned to the fuel tank 30.

In the present invention, the atmosphere emitting body 41 is projected from the bottom portion 40 of the fuel chamber 16.
It is performed by inserting the upper portion of the air emitting body 41 into the communication port 43 provided in the air releasing body 41, and the air emitting body 41 is configured to have a cord-like body or a foam of open cells. .

In the example shown in FIG. 2, a cap body 42 surrounding the atmosphere emitting body 41 is screwed to the lower surface of the fuel chamber 16 of the carburetor 10, and the inside of the cap body 42 is exposed to the outside air. The thing which provided the communication port 43 for communicating is shown.

The operation of the embodiment will be described.

While the two-cycle engine 12 is in operation, the fuel pump 32 operates so that the fuel flows from the fuel tank 30 into the fuel chamber 16 at a sufficient flow rate.
18 are supplied. Therefore, the level of the fuel 18 in the fuel chamber 16 reaches the upper end of the overflow weir 34, and the excess amount of the fuel 18 in the fuel chamber 16 overflows from the overflow weir 34 to the excess fuel passage 36, It is returned to the fuel tank 30 via the excess fuel hose 38. Further, the fuel 18 in the fuel chamber 16 is held at the level of the upper end of the overflow weir 34, and as a result, the fuel 18 in the fuel chamber 16 is retained in the main jet 20 and the nozzle hole 22.
Is injected into the intake passage 14 through the two-cycle engine 12
It is prevented that the fuel supply for driving the vehicle is disturbed.

On the other hand, after the two-cycle engine 12 is stopped, the operation of the fuel pump 32 is stopped and the supply of the fuel 18 from the fuel tank 30 into the fuel chamber 16 by the fuel pump 32 is also stopped. The fuel 18 remaining in the interior 16 is gradually vaporized and released to the atmosphere via the atmosphere emitter 41 over a long period of time.

In this case, if the atmosphere emitting body 41 is covered with the cap body 42 having the communication port 43, the release period of the residual fuel can be controlled depending on the selection of the cross-sectional area of the communication port 43. is there.

[Effect of device]

In the configuration of claim 1, the fuel remaining in the fuel chamber due to the stop of the operation of the engine gradually goes through the atmosphere emitter regardless of the posture of the carburetor, that is, even if the fuel is inclined. When the engine is used again within a short period of time, the fuel will be released again to the atmosphere, and generally, it will take about one month or more until the fuel of this kind corrodes. When the fuel does not have to be sent into the room and is not used for a long period of time, the entire amount can be surely discharged.

In the structure according to the second aspect, the rate of fuel release to the atmosphere can be controlled by selecting the cross-sectional area of the communication port provided in the cap body that covers the atmosphere release body.

[Brief description of drawings]

1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view of an essential part of another embodiment, and FIG. 3 is a sectional view of a conventional example. In the figure, 10 ... Vaporizer 14 ... Intake passage 16 ... Fuel chamber 18 ... Fuel 34 ... Overflow weir 40 ... Bottom 41 ... Atmosphere emitter.

Claims (2)

[Scope of utility model registration request] 1. A carburetor (10) for a two-cycle engine, comprising a fuel chamber (16) for storing a fuel (18) discharged to an intake passage (14), the oil level of the fuel (18). From the bottom portion (40) of the fuel chamber (16) provided with an overflow weir (34) for holding the fuel, a string-like body or an open-cell foam for discharging the residual fuel in the fuel chamber (16) is formed. An automatic residual fuel discharge device for a carburetor for a two-cycle engine, in which an atmospheric emitter (41) is projected. 2. The automatic residual fuel for a carburetor for a two-cycle engine according to claim 1, wherein the atmosphere emitting body (41) is covered with a cap body (42) having a communication port (43) to the outside air. Ejection device.