JPH0734206Y2 - Fuel gas supply device using carburetor for gas engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a fuel gas supply device using a carburetor for a gas engine.

[Background of the Invention] Since a gas engine has less harmful components in exhaust gas than a gasoline engine, it is effectively used as a drive source for indoor work.

A gas engine can be manufactured by replacing the carburetor of a gasoline engine with a fuel gas / air mixing means.

However, the demand for the gas engine is smaller than that of the gasoline engine, so that if the fuel gas / air mixing means is manufactured separately from the carburetor, the cost becomes high.

Therefore, development of a fuel gas supply device using a carburetor is desired.

[Basic Structure] The basic structure of the fuel gas supply device using a carburetor for a gas engine, which is the premise of the present invention, is as follows.

For example, as shown in FIG. 1, FIG. 2 or FIG. 4, the fuel gas supply port 3 of the fuel gas supply device 2 of the gas engine 1
Is communicated with the combustion chamber 9 via the pressure regulator 4, the fuel gas / air mixing means 6, the throttle valve 7 of the carburetor 5, and the intake passage 8.

[Prior Art] In the above-mentioned basic structure, as a concrete structure of the fuel gas / air mixing means 6, there is conventionally a structure shown in FIG.

In this configuration, a separate fuel gas / air mixing means 6 is adjacent to the carburetor 5, and the pressure adjusting gas outlet 12 of the pressure regulator 4 is connected to the fuel gas / air mixing means 6.

[Problems to be Solved by the Invention] Therefore, the above-mentioned conventional technique has the following problems.

The fuel gas / air mixing means 6 having a structure different from that of the carburetor 5 is required, the structure of the fuel gas supply device 2 is complicated, and the manufacturing cost becomes high.

The fuel gas / air mixing means 6 is provided adjacent to the carburetor 5.
As a result, the projecting dimension of the fuel gas supply device 2 from the engine becomes larger, and the engine becomes larger.

An object of the present invention is to configure the fuel gas / air mixing means by directly utilizing the structure of the carburetor.

[Means for Solving the Problem] (First Invention) The first invention is characterized in that, in the basic structure, the specific structure of the fuel gas / air mixing means 4 is as follows.

For example, as shown in FIG. 1, the fuel gas float chamber inlet 11 is opened in the float chamber cup 10 of the carburetor 5, and the pressure regulating gas outlet 12 of the pressure regulator 4 is provided in the fuel gas float chamber inlet 11.
To the fuel gas float chamber inlet of the carburetor 5.
11.Float chamber 13.Main nozzle hole 14 and Venturi
The fuel gas / air mixing means 6 is composed of 15.

(Second Invention) The second invention is characterized in that, in the basic structure, the specific structure of the fuel gas / air mixing means 6 is as follows.

For example, as shown in FIG. 3, the carburetor 5 is provided with a fuel gas inlet port 16 to the float chamber 13, and the fuel gas inlet port 16 is connected to the pressure regulating gas outlet 12 of the pressure regulator 4. Fuel gas inlet 16 and float chamber 13
The main nozzle hole 14 and the venturi 15 constitute the fuel gas / air mixing means 6.

[Effect] The first and second inventions have the following effects.

The fuel gas float chamber inlet of the carburetor or the fuel gas inlet to the float chamber, the float chamber, and the main nozzle hole are used as the gas flow passage, and the gasoline venturi can be used as it is as the fuel gas venturi, and the carburetor can be used as it is as fuel gas / air mixture. Since it can be used as a means, the structure of the fuel gas supply device is simplified and the manufacturing cost is reduced.

Since the carburetor can be used as it is as the fuel gas / air mixing means, the projecting dimension of the fuel gas supply device from the engine is small and the engine can be made compact.

[Embodiment] An embodiment of the present invention will be described with reference to the drawings.

1 and 2 are views for explaining a fuel gas supply device using a carburetor for a gas engine according to an embodiment of the present invention. FIG. 1 is a vertical cross-sectional side view of the fuel gas supply device, and FIG. FIG. 3 is a side view of the engine, FIG. 3 is a partially cutaway front view of a fuel gas supply device according to another embodiment, and FIG. 4 is a view corresponding to FIG.

As shown in FIG. 2, reference numeral 1 indicates a gas engine, and the gas engine 1 is provided with a fuel gas supply device 2 on the right rear portion of its cylinder head 24.

As shown in FIG. 1, the fuel gas supply device 2 is a fuel gas
17 is supplied from the fuel gas supply source 18 to the shutoff valve 19, the pressure regulator 4, and the fuel gas / air mixing means 6, and the air 21 is supplied from the air cleaner 23 to the fuel gas / air supply mixing means 6, where the fuel gas is supplied. 17 and the air 21 are mixed, and the mixture 22 is supplied to the combustion chamber 9 through the throttle valve 7 and the intake passage 8 of the carburetor 5 in order.

The fuel gas supply device 2 includes a fuel gas supply port 3 of a fuel supply source 18, a shutoff valve 19, a pressure regulator 4, a connecting pipe 20, a fuel gas / air mixing unit 6, and a throttle valve 7 of a carburetor 5.
Further, the air cleaner 23 is connected to the combustion chamber 9 via the intake passage 8 and the air cleaner 23 is connected to the fuel gas / air mixing means 6.

The fuel gas / air mixing means 6 is constructed as follows using the carburetor 5.

The fuel gas float chamber inlet 11 is opened on the bottom wall of the float chamber cup 10 of the carburetor 5, and the fuel gas float chamber inlet 11 is opened.
The pressure regulating gas outlet 12 of the pressure regulator 4 is communicated with.

The fuel gas float chamber inlet 11, the float chamber 13, the main nozzle hole 14, and the venturi 15 of the carburetor 5 constitute the fuel gas / air mixing means 6, and the fuel gas float chamber inlet 11, the float chamber 13, the main nozzle of the carburetor 5 are formed. Hole
14 is used as a gas flow passage, the venturi 15 can be used as it is as a fuel gas venturi, and the carburetor 5 can be used as it is as fuel gas / air mixing means 6.

The main nozzle and the main jet are extracted from the main nozzle hole 14, and the fuel gas 17 having a lower concentration than gasoline is used.
Is designed to be distributed in large quantities.

At the pressure regulating gas outlet 12 of the pressure regulator 4, a fuel gas amount regulating valve 25
Is arranged so that the fuel gas control valve 25 can be adjusted and operated without receiving the vibration of the engine 1.

In another embodiment shown in FIG. 3, a fuel gas inlet 16 to the float chamber 13 is opened in the side wall of the main body of the carburetor 5, and the fuel gas inlet 16 is connected to the pressure regulating gas outlet 12 of the pressure regulator 4. The fuel gas / air mixing means 6 is constituted by the fuel gas inlet 16 of the main body of the carburetor 5, the float chamber 13, the main nozzle hole 14 and the venturi 15, and the fuel gas inlet 16 of the carburetor 5, the float chamber 13, the main The nozzle hole 14 is used as a gas flow path, the gasoline venturi 15 can be used as it is as a fuel gas venturi, and the carburetor 5 can be used as it is as a fuel gas / air mixing means 6.

In this embodiment, the fuel gas amount control valve 25 is the fuel gas inlet 16
It is located at.

[Brief description of drawings]

1 and 2 are views for explaining a fuel gas supply device using a carburetor for a gas engine according to an embodiment of the present invention. FIG. 1 is a vertical cross-sectional side view of the fuel gas supply device, and FIG. FIG. 3 is a side view of the engine, FIG. 3 is a partially cutaway front view of a fuel gas supply device according to another embodiment, and FIG. 4 is a view corresponding to FIG. 1 ... Gas engine, 2 ... Fuel gas supply device, 3 ...
Fuel gas supply port, 4 ... Pressure regulator, 5 ... Carburetor, 6 ... Fuel gas / air mixing means, 7 ... Throttle valve, 8 ... Intake passage, 9 ... Combustion chamber, 10 ... Float chamber Cup, 11 …… Fuel gas float chamber inlet, 12 …… Pressure control gas outlet, 13 …… Float chamber, 14 …… Main nozzle hole, 15…
… Venturi, 16 …… Fuel gas inlet.

Claims (2)

[Scope of utility model registration request] 1. A fuel gas supply port 3 of a fuel gas supply device 2 of a gas engine 1, a pressure regulator 4, a fuel gas / air mixing means 6, a throttle valve 7 of a carburetor 5 and an intake passage 8.
In a fuel gas supply device using a carburetor for a gas engine configured to communicate with a combustion chamber 9 via a fuel gas float chamber inlet 11 is opened in a float chamber cup 10 of the carburetor 5, and pressure adjustment is performed at the fuel gas float chamber inlet 11. The fuel gas / air mixing means 6 is constituted by the fuel gas float chamber inlet 11, the float chamber 13, the main nozzle hole 14 and the venturi 15 of the carburetor 5 which communicate with the pressure regulating gas outlet 12 of the vessel 4. Fuel gas supply device using engine carburetor. 2. A fuel gas supply port 2 of a fuel gas supply device 2 of a gas engine 1, a pressure regulator 4, a fuel gas / air mixing means 6, a throttle valve 7 of a carburetor 5 and an intake passage 8.
In a fuel gas supply device using a carburetor for a gas engine configured to communicate with a combustion chamber 9 via a fuel gas introduction port 16 to the float chamber 13 in the main body of the carburetor 5 and adjusting the pressure to the fuel gas introduction port 16. The pressure regulating gas outlet 12 of the vessel 4 communicates with each other, and the fuel gas inlet 16 of the carburetor 5 main body / float chamber
13 ・ Fuel gas in the main nozzle hole 14 and Venturi 15
A fuel gas supply device using a carburetor for a gas engine, characterized in that the air mixing means 6 is configured.