JPS6024921Y2 - gas carburetor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a gas carburetor that supplies fuel to a gas-fueled engine.

As a conventional gas carburetor, those shown in FIGS. 1 and 2 are known.

In other words, the venturi 2 is fitted and attached to the cylindrical main body 1,
An annular groove 3 is formed in the outer peripheral surface 2a of the venturi 2 to form an annular chamber 4 between the venturi 2 and the inner peripheral surface 1a of the main body.
communicates with the inlet port 5 formed in the main body 1, and
The opening area of the inlet port 5 can be adjusted to increase or decrease with a valve 6. Furthermore, a pair of slits 7 and 7' are discontinuous with each other along the inner circumferential surface 2b of the venturi 2 and are open and communicated with the annular chamber 4. The gaseous fuel supplied to the inlet port 5 through a pipe (not shown) flows into the annular chamber 4 through the valve 6, and a pair of slits 7.7.
' The air flows out into the venturi 2 as indicated by an arrow 49, mixes with the air flowing into the main body 1 (arrow c), and supplies the mixture to a combustion chamber (not shown).

8 is a butterfly valve.

However, with this structure, although the negative pressure in the pair of slits 7 and 7' is the same, the amount of gas fuel flowing out from the slit 7 near the inlet port 5 (arrow A) is greater than the amount from the slit 7 that is far away.
The amount will be greater than the amount of gas fuel flowing out from '' (point of arrow).

For this reason, the amount of gas fuel flowing into the inside of the venturi 2 differs in the circumferential direction, resulting in a wide concentration distribution of the air-fuel mixture exiting the gas carburetor.

The concentration of the air-fuel mixture distributed to a plurality of combustion chambers (cylinders) differs from combustion chamber to combustion chamber.

Therefore, the maximum output of the engine may be reduced, and the thermal load may be concentrated in one combustion chamber.

The present invention was developed in view of the above circumstances, and its purpose is to provide a gas carburetor in which the amount of gas fuel flowing into the venturi is made equal in the circumferential direction, thereby reducing the concentration distribution of the air-fuel mixture. It is.

An embodiment of the present invention will be described below with reference to FIG.

Note that members that are the same as those in the prior art have the same reference numerals. An annular protrusion 9 is integrally formed in the middle part of the annular chamber 3 in the vertical direction, and a small annular gap 10 is formed between the annular chamber 3 and the inner circumferential surface 1a of the main body. The chamber is divided vertically into 4°.

A pair of slits 7° 7' are in open communication with the first annular chamber 41, and an inlet port 5 is in open communication with the second annular chamber 4°.

Thus, the gas fuel supplied to the inlet port 5 flows into the second annular chamber 4□, passes through the annular gap 10, flows into the first annular chamber 41, and then enters the venturi 2 through the pair of slits 7, 7'. It flows inside and mixes with the air.

Therefore, the gaseous fuel flowing into the first annular chamber 4□ is decelerated by the gap effect (throttling effect) when passing through the annular gap 10, so that the gaseous fuel flowing into the first annular chamber 4□ is directed in the circumferential direction. Therefore, the amount of gaseous fuel flowing out into the venturi 2 from the pair of slits 7, 7' becomes uniform in the circumferential direction, and the concentration distribution of the air-fuel mixture in the circumferential direction becomes small.

Therefore, the concentration of the air-fuel mixture supplied to the plurality of combustion chambers becomes substantially uniform, and maximum output can be obtained, and the thermal load is also uniform in each combustion chamber.

The present invention is as described above. The gaseous fuel flowing into the first annular chamber 4□ passes through the annular gap 10 and is uniform in the circumferential direction. Therefore, the gaseous fuel flowing into the venturi 2 is distributed in the circumferential direction. The mixture becomes uniform and the concentration distribution of the mixture becomes smaller in the circumferential direction.

Therefore, the concentration of the air-fuel mixture supplied to the plurality of combustion chambers becomes substantially uniform, the maximum output can be increased, and the thermal load on each combustion chamber becomes substantially the same.

[Brief explanation of the drawing]

Figures 1 and 2 show conventional examples, and Figure 1 shows the I-
2 is a sectional view taken along line I, FIG. 2 is a sectional view taken along line ■--■ in FIG. 1, and FIG. 3 is a sectional view showing an embodiment of the present invention. 1 is the main body, 2 is a venturi, 4□ is a first annular chamber, 4° is a second annular chamber, 5 is an inlet port, and 7° and 7' are a pair of slits.

Claims (1)

[Scope of utility model registration request] A first annular chamber 41 and a second annular chamber 4° are formed on the outer peripheral side of the venturi 2, and the first annular chamber 4□ is opened in the inner circumferential direction of the venturi 2. A gas carburetor characterized in that a second annular chamber 42 is continuously communicated with an inlet port 5.