JPH07103007A - Fuel supplying device for liquid fuel and gas fuel dual type engine - Google Patents

Abstract

PURPOSE:To reduce the number of parts so as to reduce a cost by omitting a mixer part, a box body part of a gas flow rate regulating valve, and fitting parts. CONSTITUTION:An inside diameter D1 of an intake pipe inlet part 3a in an intake pipe 3, which is arranged between an air cleaner 2 and a carburetor 4 in a liquid fuel/gas fuel dual type engine 1 so as to connect them together, is formed larger than the inside diameter D2 of an intake pipe outlet part, 3b. A mixer part, 6 is constructed in such a way as opening a supply pipe outlet 10a of a gas supply pipe 10 from one side 3c of the outer circumference of the intake pipe outlet part, 3b to the inside wall 3d of the intake pipe outlet part, 3b. A fuel gas supply source 7 is communicated with the mixer part 6 via a pressure regulator 8, a gas cutoff valve 9, and the gas supply pipe 10, while a gas flow rate regulating valve 11 is arranged so as to face the supply pipe outlet 10a from the other side 3e of the outer circumference of the intake pipe outlet part, 3b, and consequently, a gas flow rate can be regulated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply system for a liquid fuel / gas fuel engine.

[0002]

2. Description of the Related Art A fuel supply device for a liquid fuel / gas fuel dual-use engine is known in the prior art as shown in FIG.
Some are configured as follows: That is, the air cleaner 2 of the liquid fuel / gas fuel engine 1 is connected to the intake pipe 3
Further, the mixer portion 6 is provided between the intake pipe 3 and the carburetor 4 while being connected and communicated with the intake port 5 via the carburetor 4. Then, the fuel gas supply source 7 is connected to the mixer section 6 via the pressure regulator 8, the gas cutoff valve 9, and the gas supply pipe 10, and a needle valve, for example, as the gas flow rate adjustment valve 11 is connected to the gas supply pipe 10. Intervening. In addition, the liquid fuel tank 12 is provided and the liquid fuel supply pipe 13
The liquid fuel is supplied through the liquid fuel pump 14 to the vaporizer 4 and the liquid fuel supply pipe 1
3, a liquid fuel cutoff valve 15 is interposed.
Reference numeral 16 is a strainer.

[0003]

The above-mentioned conventional techniques have the following problems. The mixer section 6 and the gas flow rate adjusting valve 11
Are configured as independent parts. As a result, the number of parts themselves and the number of parts for mounting the parts increase, resulting in an increase in cost. An object of the present invention is to reduce the number of parts and cost.

[0004]

In order to achieve the above object, the present invention adds the following improved structure to the above prior art as shown in FIGS. 1 to 3, for example. That is, the inner diameter D1 of the intake pipe inlet 3a of the intake pipe 3 which is connected and communicated between the air cleaner 2 and the carburetor 4 is formed larger than the inner diameter D2 of the intake pipe outlet 3b. The supply pipe outlet 10a of the gas supply pipe 10 is connected to the intake pipe outlet portion 3b from one of the outer circumferences 3c of the intake pipe outlet portion 3b.
The mixer section 6 is formed by opening the inner wall 3d of the above. Further, the gas flow rate adjusting valve 11 is arranged so as to face the supply pipe outlet 10a from the other outer side 3e of the intake pipe outlet portion 3b so that the gas flow rate can be adjusted.

[0005]

The present invention operates as follows. An inner diameter D1 of an intake pipe inlet 3a connected to the air cleaner 2 of the intake pipe 3 is connected to a carburetor 4 and an intake pipe outlet 3b is formed.
The inner diameter D2 is larger than the inner diameter D2. Therefore, the flow velocity of the air sucked from the air cleaner 2 is higher in the intake pipe outlet portion 3b than in the intake pipe inlet portion 3a, and the Venturi effect is obtained. The supply pipe outlet 10a of the gas supply pipe 10 is supplied from one of the outer circumferences 3c of the intake pipe outlet portion 3b.
Since the mixer portion 6 is formed by opening the inner wall 3d of the intake pipe outlet portion 3b, the fuel gas can smoothly flow into the intake pipe outlet portion 3b due to the Venturi effect. Further, the gas flow rate adjusting valve 11 is connected to the supply pipe outlet 1 from the other side 3e of the outer periphery of the intake pipe outlet portion 3b.
It is possible to adjust the gas flow rate of the fuel gas because it is arranged so as to face 0a so that its effective diameter can be changed.

[0006]

The present invention has the following effects because it is constructed and operates as described above. Between the air cleaner 2 and the carburetor 4, an intake pipe 3 having a gas flow rate adjusting valve 11 and a mixer section 6 having a Venturi effect is directly connected. Therefore, it is possible to omit the box portion of the mixer portion 6 and the gas flow rate adjusting valve 11 and the attachment components, which are independent components in the conventional technique. As a result, the number of parts can be reduced and the cost can be reduced.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a system diagram of a fuel supply system for a liquid fuel / gas fuel engine, FIG. 2 (A) is a side sectional view of a carburetor and an intake pipe, and FIG. 2 (B) is a line YY of FIG. 2 (A). FIG. In the figure, a liquid fuel / gas fuel dual-use engine 1 has a cylinder block 31 integrally formed above a crankcase 30, and a cylinder head 32 and a head cover 33 are sequentially mounted on the upper surface of the cylinder block 31, and The body is formed. A piston 35 is slidably fitted into a cylinder 34 in the cylinder block 31, and the piston 35 is inserted through a piston pin 36 and a connecting rod 37 into a crank pin 38 of a crank shaft.
It is linked to. Then, the air cleaner 2 is connected to the intake port 5 formed in the cylinder head 32 through the intake pipe 3 and the carburetor 4, and the intake pipe 3
A mixer unit 6 is provided between the vaporizer 4 and the vaporizer 4. further,
For example, a gas cylinder is provided as the fuel gas supply source 7, and the fuel gas supply pipe 1 communicates with the mixer section 6 via the pressure regulator 8, the gas cutoff valve 9, and the gas supply pipe 10.
A gas flow rate adjusting valve 11 is interposed at 0. Further, a liquid fuel tank 12 is provided to communicate with the vaporizer 4 via the liquid fuel supply pipe 13 and the liquid fuel pump 14 to supply the liquid fuel, and the liquid fuel cutoff valve 15 is connected to the liquid fuel supply pipe 13. It is constituted by interposing. Incidentally, reference numeral 1
6 is a strainer. Further, as shown in FIG. 2, the carburetor 4 includes a choke valve 17, a throttle valve 18, a fuel chamber 19, a float 20, a main jet 21, a fuel inflow hole 22, a needle valve 23 and the like.

In the above embodiment, the inner diameter D1 of the intake pipe inlet portion 3a of the intake pipe 3 connected and connected between the air cleaner 2 and the carburetor 4 is changed to the inner diameter D of the intake pipe outlet portion 3b.
It is formed larger than 2. Then, the mixer portion 6 is configured by opening the supply pipe outlet 10a of the gas supply pipe 10 to the inner wall 3d of the intake pipe outlet portion 3b from one of the outer circumferences 3c of the intake pipe outlet portion 3b. Further, the gas flow rate adjusting valve 11 is arranged opposite to the supply pipe outlet 10a from the other side 3e of the outer periphery of the intake pipe outlet portion 3b so that the gas flow rate can be adjusted. When the liquid fuel / gas fuel dual-use engine 1 is operated with gas fuel, the liquid fuel cutoff valve 15 is closed and then the gas cutoff valve 9 is opened, and the gas fuel is mixed with the mixer portion 6 Supply to. On the contrary, when operating with liquid fuel, the gas cutoff valve 9 is closed and then the liquid fuel cutoff valve 15 is opened to supply the liquid fuel to the carburetor 4.

FIG. 3 shows another embodiment of the present invention and is a side sectional view of a carburetor and a mixer section. Instead of forming the inner diameter D1 of the intake pipe inlet portion 3a of the intake pipe 3 larger than the inner diameter D2 of the intake pipe outlet portion 3b in the above embodiment, in this embodiment, the intake pipe 3 has a conventional structure. With the same structure as described above, the inner diameter D3 of the mixer inlet 6 on the intake inlet side 6a is smaller than the inner diameter D4 of the intake outlet 6b. The supply pipe outlet 10a of the gas supply pipe 10 is connected to the intake outlet side 6b from one of the outer circumferences 6c of the intake outlet side 6b.
Is opened to the inner wall 6d of the
The gas flow rate adjusting valve 11 is arranged so as to face the supply pipe outlet 10a from the other side 6e of the outer periphery of the above, so that the gas flow rate can be adjusted. As a result, the mixer section 6 can have a Venturi effect, and the box portion and the mounting parts of the gas flow rate adjusting valve 11 which are independent parts in the prior art can be omitted.

[Brief description of drawings]

FIG. 1 is a system diagram of a fuel supply device for a liquid fuel / gas fuel engine according to an embodiment of the present invention.

FIG. 2 shows an embodiment of the present invention, FIG. 2 (A) is a side sectional view of a carburetor and an intake pipe, and FIG. 2 (B) is a sectional view taken along the line YY of FIG. 2 (A).

FIG. 3 is a side sectional view of a carburetor and a mixer part according to another embodiment of the present invention.

FIG. 4 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine for both liquid fuel and gas fuel, 2 ... Air cleaner, 3 ... Intake pipe, 3a ... Intake pipe inlet part, 3b ... Intake pipe outlet part, 3c ... One of outer periphery, 3d ... Inner wall, 3e ... Other of outer periphery, 4 ... carburetor, 5 ... intake port, 6 ... mixer section, 7 ...
Fuel gas supply source, 8 ... Pressure regulator, 9 ... Gas cutoff valve, 1
0 ... Gas supply pipe, 10a ... Supply pipe outlet, 11 ... Gas flow rate adjusting valve, D1, D2 ... Inner diameter.

Claims (1)

[Claims] 1. An air cleaner (2) of a liquid fuel / gas fuel engine (1) is connected to an intake port (5) through an intake pipe (3) and a carburetor (4), and the intake pipe is
A mixer section (6) is provided between the (3) and the vaporizer (4), and the fuel gas supply source (7) is connected to the pressure regulator (8) and the gas cutoff valve (9).
-Communication with the mixer section (6) through the gas supply pipe (10), and a gas flow rate adjusting valve on the gas supply pipe (10)
In a fuel supply system for a liquid fuel / gas fuel engine with (11) interposed, an intake pipe inlet of the intake pipe (3) connected and communicated between the air cleaner (2) and the carburetor (4). Inner diameter of part (3a)
(D1) is formed larger than the inner diameter (D2) of the intake pipe outlet portion (3b), and the supply pipe outlet of the gas supply pipe (10) is supplied from one of the outer circumferences (3c) of the intake pipe outlet portion (3b). (10a) is opened to the inner wall (3d) of the intake pipe outlet part (3b) to form a mixer part (6), and the gas flow rate from the other (3e) of the outer periphery of the intake pipe outlet part (3b). A fuel supply apparatus for a liquid fuel / gas fuel dual-use engine, characterized in that a regulating valve (11) is arranged opposite to the supply pipe outlet (10a) so that the gas flow rate can be regulated.