JPH0666206A - Fuel gas mixing device of duplex gasoline/gas engine - Google Patents

Abstract

PURPOSE:To reduce a cost by detachably inserting and fixing a furl gas mixing venturi into an air cleaner connecting part of a duplex gasoline/gas engine and decreasing the number of parts while reducing the size from an air cleaner to a carburetor. CONSTITUTION:A fuel gas mixing venturi 5 is detachably inserted into and fixed to an inner wall 9a on the carburetor side in an air cleaner connecting part where the air cleaner 2 of a duplex gasoline/gas engine 1 is brought in connection to a carburetor 3. A fuel gas feed pipe 6 is arranged through the fuel gas mixing venturi 5 from one side 8b of the periphery of the air cleaner connecting part. moreover, a fuel gas flow rate adjusting valve 8 is arranged through the other side 9c of the periphery in the air cleaner connecting part so as to face to the outlet 6a of the fuel gas feed pipe 6, thereby gas flow rate can be adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel gas mixing device for a gasoline / gas dual-use engine.

[0002]

2. Description of the Related Art A conventional fuel gas mixing apparatus for a gasoline / gas dual-purpose engine is constructed as shown, for example, in FIG. That is, the fuel gas mixing venturi 5 is provided in the intake passage 4 extending from the air cleaner 2 of the gasoline / gas dual-use engine 1 to the carburetor 3. Then, the outlet 6a of the fuel gas supply pipe 6 is opened in the inner wall 5a of the fuel gas mixing venturi 5. Further, a fuel gas flow rate adjusting valve 8 is provided between the fuel gas supply source 7 and the outlet 6a of the fuel gas supply pipe 6. In the above prior art, the fuel gas mixing venturi 5 is mounted so as to be sandwiched in the intake passage 4 between the air cleaner 2 and the carburetor 3, and the fuel gas flow rate adjusting valve 8 is configured as an independent component. It was

[0003]

The above-mentioned conventional techniques have the following problems. (B) Attach the venturi 5 for fuel gas mixing to the air cleaner 2
Since it is mounted so as to be sandwiched in the intake passage 4 between the carburetor 3 and the carburetor 3, the dimension in the longitudinal direction is increased by the amount of the fuel gas mixing venturi 5. (B) Since the fuel gas flow rate adjusting valve 8 is an independent part, the number of parts of itself and the number of parts for mounting the same are increased, and the cost is increased. SUMMARY OF THE INVENTION An object of the present invention is to reduce the number of parts to reduce the cost while preventing the longitudinal dimension between the air cleaner and the carburetor from increasing.

[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 and 2, for example. That is, the fuel gas mixing venturi 5 is detachably inserted and fixed to the carburetor-side inner wall 9a of the air cleaner connecting portion 9 that connects the air cleaner 2 to the carburetor 3. Then, from one outer peripheral side 9b of the air cleaner connecting portion 9,
A fuel gas supply pipe 6 is provided so as to penetrate the fuel gas mixing venturi 5, and a fuel gas flow rate adjusting valve 8 is provided at the outlet 6 of the fuel gas supply pipe 6 from the other outer peripheral side 9c.
It is arranged so as to face a, and the gas flow rate can be adjusted.

[0005]

The present invention operates as follows. The fuel gas mixing venturi 5 is inserted into the carburetor-side inner wall 9a of the air cleaner connecting portion 9, and is fixed by connecting and fixing the air cleaner connecting portion 9 to the carburetor 3. Fuel gas supply pipe 6
Penetrates through the air cleaner connecting portion 9 and the fuel gas mixing venturi 5, and has an outlet 6a opened in the inner wall 5a of the fuel gas mixing venturi 5. The fuel gas flow rate adjusting valve 8 is disposed so as to face the other side 9c on the outer periphery of the air cleaner connecting portion 9 so that the effective diameter of the outlet 6a can be varied. The fuel gas flow rate adjusting valve 8 can change the effective diameter of the outlet 6a to adjust the flow rate of the fuel gas flowing into the fuel gas mixing venturi 5.

[0006]

The present invention has the following effects because it is constructed and operates as described above. (A) Since the fuel gas mixing venturi 5 is detachably inserted and fixed to the inner wall 9a of the air cleaner connecting portion 9 on the carburetor side, the size in the longitudinal direction does not increase. In addition, the fuel gas mixing venturi 5 can be easily replaced according to usage conditions. (B) Attach the fuel gas flow rate adjusting valve 8 to the air cleaner connecting portion 9
Since it is integrated into one, the number of parts is reduced and the cost is reduced.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram of a fuel gas mixing apparatus for a gasoline / gas dual-use engine, FIG. 2 (A) is a side sectional view of the apparatus, and FIG. 2 (B) is a sectional front view of essential parts of the apparatus. In the figure, in a gasoline / gas dual-use engine 1, a cylinder block 11 is integrally formed above a crankcase 10, and a cylinder head 12 and a head cover 13 are sequentially mounted on the upper surface of the cylinder block 11 to mount an engine body. Has been formed. A piston 15 is slidably fitted into a cylinder 14 in the cylinder block 11, and the piston 15 is inserted through a piston pin 16 and a connecting rod 17.
It is interlockingly connected to the crank pin 18 of the crank shaft. The intake port 1 formed in the cylinder head 12
The carburetor 3 and the air cleaner 2 are connected to each other, a gasoline tank 20 is disposed on the upper part of the engine body, and gasoline is supplied to the carburetor 3 by a gasoline supply pipe (not shown). The fuel gas mixing venturi 5 is removably inserted into the carburetor-side inner wall 9a of the air cleaner connecting portion 9 that connects the air cleaner 2 of the gasoline / gas dual-use engine 1 to the carburetor 3, and the flange of the air cleaner connecting portion 9 is inserted. The portion 9d is fastened and fixed to the carburetor 3 with a bolt and nut (not shown). A fuel gas supply pipe 6 for supplying a fuel gas from a fuel gas supply source 7 is provided from one outer periphery 9b of the air cleaner connecting portion 9 through the fuel gas mixing venturi 5 to mix the fuel gas. An outlet 6a of the fuel gas supply pipe 6 is opened in the inner wall 5a of the venturi 5. Further, the fuel gas flow rate adjusting valve 8 is disposed so as to face the outlet 6a of the fuel gas supply pipe 6 from the other side 9c of the outer periphery of the air cleaner connecting portion 9, and the screw portion 8a is advanced and retracted to enable the outlet 6a. The flow rate of the fuel gas flowing into the fuel gas mixing venturi 5 can be adjusted by changing the diameter. still,
Reference numeral 8b is a lock nut. On the other hand, a gasoline supply opening / closing valve 3b that can be opened and closed manually is provided at the bottom of the float chamber 3a of the carburetor 3. When the gasoline / gas dual-use engine 1 is operated with gasoline, the fuel gas flow rate adjusting valve 8 is closed to stop the supply of fuel gas, and the gasoline supply opening / closing valve 3b is opened to float. The gasoline in the chamber 3a is supplied to the engine 1 through the gasoline mixing venturi 3c. When the gasoline / gas dual-use engine 1 is operated by gas, the gasoline supply opening / closing valve 3b is closed to stop the supply of gasoline, and the fuel gas flow rate adjusting valve 8 is opened. Fuel gas is supplied to the engine 1 via a fuel gas mixing venturi 5.

[Brief description of drawings]

FIG. 1 is a system diagram of a fuel gas mixing apparatus for a gasoline / gas dual-use 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 the apparatus, and FIG. 2 (B) is a sectional front view of the main part of the apparatus.

FIG. 3 shows a conventional example, and FIG. 3 is a diagram corresponding to FIG.

[Explanation of symbols]

1 ... Gasoline / gas dual-use engine, 2 ... Air cleaner,
3 ... Vaporizer, 4 ... Intake passage, 5 ... Venturi for mixing fuel gas, 5a.9a ... Inner wall, 6 ... Fuel gas supply pipe, 6a ...
Outlet, 7 ... Fuel gas supply source, 8 ... Fuel gas flow rate adjusting valve, 9 ... Air cleaner connecting portion, 9b ... One of outer circumference, 9c
... the other side of the perimeter.

Claims (1)

[Claims] 1. A fuel gas mixing venturi (5) is provided in an intake passage (4) from an air cleaner (2) of a gasoline / gas dual-use engine (1) to a carburetor (3), and the fuel gas mixing venturi (5) is provided. The outlet (6a) of the fuel gas supply pipe (6) is opened in the inner wall (5a) of (5), and the outlet of the fuel gas supply pipe (6) from the fuel gas supply source (7).
A fuel gas mixing device for a gasoline / gas dual-use engine having a fuel gas flow rate adjusting valve (8) provided up to (6a), wherein an air cleaner connecting the air cleaner (2) to the carburetor (3). The fuel gas mixing venturi (5) is detachably inserted and fixed to the inner wall (9a) of the portion (9) on the carburetor side, and one of the outer peripheries (9b) of the air cleaner connecting portion (9) is
Connect the fuel gas supply pipe (6) to the fuel gas mixing venturi.
While penetrating through (5), the other of its outer circumference (9c)
From the fuel gas flow control valve (8) to the fuel gas supply pipe
A fuel gas mixing apparatus for a gasoline / gas dual-use engine, which is arranged so as to face the outlet (6a) of (6) so that the gas flow rate can be adjusted.