JPH0730932Y2 - Fuel gas supply device for gas engine - Google Patents

Description

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

[Background of the Invention] In a gas engine, it may be necessary to switch between different types of fuel gas, such as propane gas and city gas, depending on the location of use and the manner of use.

Since these different gases have different calories from each other,
The amount of gas supplied to the venturi must be appropriately adjusted so that a small amount is supplied when the calorific value of the gas species used is large and a large amount is supplied when the calorific value is small.

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

For example, as shown in FIG. 1 (A) / (B), FIG. 2 or FIG. 4 (A) / (B), the fuel gas supply port 2 of the fuel gas supply device 1 of the gas engine is replaced with a pressure regulator. 3. Gas inlet hole 7 of venturi 6 of flow rate switching means 4 and mixer 5
It is configured to communicate with the Venturi 6 via the.

[Prior Art] In the above-mentioned basic structure, as the flow rate switching means 4, there is a conventional one shown in FIGS. 4 (A) and 4 (B).

This uses a flow rate switching valve 9 as the flow rate switching means 4,
This was interposed between the pressure regulator 3 and the gas inlet hole 7 of the venturi 6.

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

When the gas inlet hole 7 is formed to have a small diameter so as to be suitable for supplying high calorie gas, when low calorie gas is used, even if an attempt is made to increase the flow rate by adjusting the flow rate switching valve 9, The gas inlet hole 7 is formed to have a relatively large diameter because 10 is not supplied into the venturi 6 in an appropriate amount due to the resistance of passing through the gas inlet hole 7 having a small diameter.

Therefore, when using high calorie gas, the diameter of the gas inlet hole 7 is larger than its ideal size,
The penetration force from the gas inlet hole 7 into the venturi 6 is weak, and the mixing performance of the fuel gas 10 and the air 11 in the venturi 6 is low.

Therefore, when high calorie gas is used, fuel consumption is high, output performance is low, and exhaust gas contains many harmful components.

An object of the present invention is to improve the mixing performance of fuel gas and air in the venturi.

[Means for Solving the Problems] The present invention is characterized in that, in the basic structure, the flow rate switching means 4 is configured as follows.

For example, as shown in FIGS. 1 (A) and (B), the flow rate switching means 4 includes at least two kinds of gas inlet holes 7 and a gas inlet hole 7a for a large flow rate and a gas inlet hole 7b for a small flow rate. And a small flow rate gas inlet hole 7a and a small flow rate gas inlet hole 7b are provided so as to face the venturi 6,
The gas inlet hole selective closing means 8 is configured so that one of the at least two kinds of gas inlet holes 7 of the large flow rate gas inlet hole 7a and the small flow rate gas inlet hole 7 is left and the remaining gas inlet hole 7 is left. The hole 7 is selected and closed.

[Effect] The present invention has the following effects.

Since the flow rate is adjusted according to the difference in the calorie of the fuel gas by switching between the large flow rate gas inlet hole and the small flow rate gas inlet hole, an appropriate amount of low calorie gas is supplied from the large flow rate gas outlet hole into the venturi. In addition, high calorie gas can be supplied into the venturi with sufficient penetrating power from the gas inlet hole for small flow rate, and the mixing performance of the fuel gas and air in the venturi is high.

Therefore, even when using a high-calorie fuel gas, it is possible to reduce fuel consumption, improve output performance, and reduce harmful components in exhaust gas.

Since the flow rate switching means can be formed by utilizing the structure of the existing venturi, the structure can be simple in achieving the above effect.

[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 for a gas engine according to an embodiment of the present invention. FIG. 1 (A) is a vertical cross-sectional side view of the periphery of a venturi, and FIG. 1 (B). Is a sectional view taken along the line BB of FIG. 1 (A), FIG. 2 is a partially cutaway side view of the fuel gas supply device, and FIG. 3 is a schematic view of a flow rate switching means according to another embodiment. .

As shown in FIG. 2, a fuel gas supply device 1 for a gas engine supplies a fuel gas 10 from a fuel supply source 12 to a mixer 5 via a pressure regulator 3 and a flow rate switching means 4 in that order, and air 11 as an air cleaner. The fuel gas 10 and the air 11 are mixed in the venturi 6 of the mixer 5 from the mixer 13, and the mixed fuel gas 10 and the air 11 are supplied to the engine cylinder (not shown) from the intake manifold 14.

The fuel gas supply device 1 is configured such that the fuel gas supply port 2 of the fuel supply source 12 is communicated with the venturi 6 through the pressure regulator 3, the flow rate switching means 4 and the gas inlet hole 7 of the venturi 6 of the mixer 5. I am doing it.

As shown in FIGS. 1 (A) and (B), the flow rate switching means 4 includes a large flow rate gas inlet hole 7a and a small flow rate gas inlet hole 7b.
Two kinds of gas inlet holes 7 and a gas inlet hole selective closing means 8 are provided, and a large flow rate gas inlet hole 7a and a small flow rate gas inlet hole 7b are provided.
Is opened to face the Venturi 6.

The gas inlet hole selection closing means 8 includes two kinds of gas inlet holes 7 of a large flow rate gas inlet hole 7a and a small flow rate gas inlet hole 7b.
The remaining gas inlet hole 7 is selected and the remaining gas inlet hole 7 is selected and closed, and when the fuel gas 10 to be used has a low calorie, it is supplied through the large flow rate gas inlet hole 7a. The fuel gas 10 is smoothly supplied into the Venturi 6,
The required supply amount of the fuel gas 10 to the inside is secured, and when the fuel gas 10 to be used has a high calorie, the fuel gas 10 has a high penetrating force into the venturi 6 through the small flow rate gas inlet hole 7b. Supply and fuel gas 10 and air in Venturi 6
The mixing performance with 11 is improved.

The large flow rate gas inlet holes 7a and the small flow rate gas inlet holes 7b are formed by penetrating the venturi 6 and forming four of each, and they are alternately arranged at a phase of 45 degrees.

The gas inlet hole selective closing means 8 is formed with four sealing pieces 15 projecting from the inner peripheral surface of the venturi housing 16 and arranged in a phase of 90 degrees, and the tip end thereof is between the venturi housing 16 and the venturi 6. It is slidably abutted on the outer peripheral surface of the venturi 6 while traversing the gas distribution passage 17 formed in.

The venturi 6 is rotatably fitted in the venturi housing 16, and a gas inlet hole 7 corresponding to the type of the fuel gas 10 used is provided with a gas distribution passage 17 by rotating the venturi 6.
The unused gas inlet hole 7 while connecting the
The gas inlet hole 7 can be selected according to the type of the fuel gas 10 used.

In the venturi housing 16, a rotation stop screw 18 for the venturi 6 is arranged so that the venturi 6 can be locked at an appropriate rotation position.

In another embodiment shown in FIG. 3, two kinds of gas distribution passages 17 and 17 which are individually communicated with the large flow rate gas inlet hole 7a and the small flow rate gas inlet hole 7b are provided, and the respective passages 17 and 17 are switched. The valve 19 is selected to communicate with the pressure regulator 3.

[Brief description of drawings]

1 and 2 are views for explaining a fuel gas supply device for a gas engine according to an embodiment of the present invention. FIG. 1 (A) is a vertical cross-sectional side view around a venturi, and FIG. 1 (B). 1 is a sectional view taken along the line BB of FIG. 1 (A), FIG. 2 is a partially cutaway side view of the fuel gas supply device, and FIG. 3 is a schematic view of a flow rate switching means according to another embodiment. , FIG. 4 is an explanatory view of the prior art, FIG. 4 (A) is a corresponding view to FIG. 1 (A), and FIG. 4 (B).
Is a diagram corresponding to FIG. 1 (B). 1 ... Fuel gas supply device, 2 ... Fuel gas supply port, 3 ... Pressure regulator, 4 ... Flow rate switching means, 5 ... Mixer, 6 ... Venturi, 7 ... Gas inlet hole, 7a ... Large flow rate gas inlet hole, 7b ... Gas inlet hole for small flow rate, 8 ... Gas inlet hole selective sealing means.

Claims (1)

[Scope of utility model registration request] 1. A fuel gas supply port 2 of a fuel gas supply device 1 of a gas engine is communicated with a venturi 6 through a pressure regulator 3, a flow rate switching means 4 and a gas inlet hole 7 of a venturi 6 of a mixer 5. In the fuel gas supply device for a gas engine configured as described above, the flow rate switching means 4 includes at least two kinds of gas inlet holes 7 of a large flow rate gas inlet hole 7a and a small flow rate gas inlet hole 7 and a gas inlet hole selection closing means. The gas inlet hole 7a for large flow rate and the gas inlet hole 7b for small flow rate are opened to face the venturi 6, and the gas inlet hole selection closing means 8 is for the large flow rate gas inlet hole 7a and the small flow rate. A gas engine, characterized in that one of the at least two gas inlet holes 7 of the gas inlet hole 7b for use is left, and the remaining gas inlet hole 7 is selected and closed. Fuel gas supply device.