JP2676260B2 - Gas engine mixer - Google Patents

Description

The present invention relates to an annular gas passage formed around a venturi passage portion and a gas ejection hole communicating with the annular gas passage and opening into the venturi passage portion. The present invention relates to a mixer for a gas engine, which is in communication with a gas supply source via an adjuster mechanism.

(Prior Art and Problems Thereof) A conventional gas engine mixer is disclosed in, for example, Shokai Sho 62-21.
Like 459, the gas is ejected to the venturi passage part only through the gas passage having the adjuster mechanism, and the adjusting screw of the adjusting mechanism is directly inserted into the screw part because it is formed in the mixer main body. .

Generally, when a low-calorie gas is used, the required gas supply amount increases, while when a high-calorie gas is used, the gas supply amount may be small, but fine adjustment of the gas supply amount is required.

However, in the conventional structure as described above, there arises a problem that the responsiveness of the fuel gas supply amount deteriorates as described below with respect to changes in the type of fuel gas or changes in load.

(1) In the structure that ejects gas only through the gas passage having the adjuster mechanism, for example, when the adjuster mechanism having the specifications suitable for high calorie gas is provided, the gas supply amount is changed when the calorie gas is changed to low calorie gas. Run short.

Further, even when the load suddenly changes, the negative pressure on the gas side affects the regulator, and the gas supply amount becomes unstable. For example, when the load increases, the gas supply amount becomes insufficient and the output decreases.

(2) With regard to the structure in which the adjuster screw is screwed directly into the female thread part of the mixer main body, the diameter and pitch of the screw cannot be changed for changing the gas of different calories, and it is suitable for each calorie. It is difficult to adjust the flow rate.

(Object of the Invention) An object of the present invention is to provide a mixer for a gas engine, which can perform a gas supply function with good responsiveness to changes in the type of fuel gas or load.

(Technical means for achieving the object) In order to achieve the above object, the invention according to claim 1 of the present application forms a chamber gas chamber having a large volume in a mixer body so as to surround a venturi portion, and the chamber gas The chamber is connected between the adjuster mechanism and the gas supply source, and a communication hole that directly communicates with the chamber gas chamber and the annular gas passage is formed separately from the gas passage passing through the adjuster mechanism.

In the invention according to claim 2 of the present application, as a adjuster mechanism, a replaceable joint pipe for an adjuster is mounted separately from the mixer body, and a flow rate adjusting screw is screwed into the joint pipe.

(Embodiment) FIGS. 1 and 2 show a mixer of a gas engine to which the invention described in claim 1 of the present application is applied. In FIG. 1, a gasket 2 is inserted on the end surface of the mixer body 1 on the air cleaner side. Then, the main body lid 3 is fixed, the intake passage 6 is formed in the mixer main body 1 and the lid 3, the upstream side of the intake passage 6 is connected to the air cleaner 9, and the downstream side is burned through an intake manifold (not shown). Connected to Chamber 10.

An annular venturi body 7 is fitted in a substantially central portion of the intake passage 6 in the longitudinal direction, and a throttle valve 17 is provided on the downstream side so that the opening can be adjusted. An annular gas passage 8 is formed in the venturi body 7 so as to surround the venturi passage portion 6a, and two left and right gas ejection holes 11 that open toward the inside of the venturi passage portion 6a are formed.

A gas passage 12 communicating with the upper end of the annular gas passage 8 and extending upward is formed in the upper portion of the mixer body 1, and a gas flow rate adjusting screw 14 is arranged in the gas passage 12. The adjusting screw 14 is screwed into the upper female thread portion of the gas passage 12 so that the opening can be adjusted, and is locked by a nut 15. An upper gas passage 16 extending toward the lid 3 is formed on the upstream side of the gas passage 12.

In FIG. 2 showing the II-II cross section of FIG. 1, in the mixer body 1, a partition wall having a substantially annular shape around the venturi body 7 is provided.
A chamber gas chamber 20 is formed so as to surround the chamber 1a with a space therebetween, and the chamber gas chamber 20 has a large volume. The partition wall 1a is formed integrally with the mixer body 1. The upper end of the chamber gas chamber 20 is the upper gas passage 16
And the lower end communicates with the lower gas passage 21, and the lower gas passage 21 communicates with the gas supply source 23 via the gas intake pipe 22, the regulator 27 and the like.

A communication hole 25 is formed in the partition wall 1a at a location (one location or a plurality of locations) different from the gas passage 12 in the upper part of FIG. 1, and the chamber gas chamber 20 and the venturi body 7 are annularly formed by the communication hole 25. It directly communicates with the gas passage 8.
The communication hole 25 is inclined so that the center side of the intake passage is on the downstream side, and the flow cross-sectional area thereof is smaller than the flow cross-sectional area of the gas passage 12.

The operation will be described. The gas sent from the gas supply source 23 in FIG. 2 is supplied to the chamber gas chamber 20 via the gas intake pipe 22 and the lower gas passage 21.

The gas in the chamber gas chamber 20 is divided into right and left and rises, but a part of the gas directly enters the annular gas passage 8 through the communication hole 25 of the partition wall 1a. On the other hand, the flow rate of the gas reaching the upper gas passage 16 is adjusted by the adjusting screw 14 shown in FIG. 1, and enters the annular gas passage 8 through the gas passage 12.

As described above, the gas passing through the communication hole 25 and the gas passing through the adjusting screw 14 both enter the annular gas passage 8 and are ejected from each gas ejection port 11 into the venturi passage portion 6a and mixed with the air from the air cleaner 9. It

The air mixed with the gas is supplied from the intake manifold to the combustion chamber 10 through the throttle valve 17.

While forming the chamber gas chamber 20 as described above,
Since the communication hole 25 from the chamber gas chamber 20 directly to the annular gas chamber 8 is formed separately from the passage passing through the adjustment screw 14, the communication hole 25 can be appropriately formed at any desired number of positions so that the adjustment screw 14 It can handle low-calorie gas to high-calorie gas without changing the specifications.

Further, due to the presence of the chamber gas chamber 20, the influence of the change in the negative pressure on the gas side is buffered in the chamber gas chamber 20 even when the load is suddenly increased, and the regulator 27 can stably supply the gas.

As the chamber gas chamber 20 of the mixer body 1 and the lid 3 shown in FIGS. 1 and 2, a float chamber of a gasoline carburetor can be used.

(Another embodiment) FIGS. 3 to 6 show a mixer to which the invention described in claim 2 is applied, and the same parts as those in the embodiments of FIGS. 1 and 2 are designated by the same reference numerals. In FIG. 4, a gas passage 40 is formed on the operating side (right side in FIG. 4) of the annular gas passage 8 of the venturi body 7, and the gas passage 40 extends laterally and has a female thread portion 31 for fitting a joint. have. An adjuster joint pipe 32, which is separate from the mixer body 1, is screwed to the female screw portion 31 in a replaceable manner, and the adjust screw 14 is screwed into the joint 32. The adjusting screw 14 has a conical valve portion 33a at the tip thereof, and adjusts the opening of the gas passage 36 in the joint pipe 32. A gas intake pipe 22 extending laterally is fixed to the joint pipe 32 as shown in FIG.
Is connected to a gas supply source 23 via a regulator 27.

As shown in FIG. 4, the joint pipe 32 is provided with a downward power gas take-out pipe 41 upstream of the valve portion 33a. The take-out pipe 41 is a pipe 42, a joint 43, and the power gas passage shown in FIG.
It communicates with the power jet 47 via 45, and this power jet 47 is communicating with the power gas ejection hole 50 of FIG. The power gas ejection hole 50 is a throttle valve.
An opening is formed in the intake passage 6 in the vicinity of the downstream side of 17. The joint 43 also communicates with the lower end of the annular gas passage 8 of the venturi body 7 as shown in FIG.

Since the adjusting screw 14 can be replaced together with the joint pipe 32 with respect to the mixer main body 1, for example, when a low calorie gas having a large required gas supply amount is used, the joint pipe 32 having a large flow cross-sectional area of the gas passage 36 and Install a unit of adjust screw 14 to secure the gas flow rate. Conversely, when using a high calorie gas that requires fine adjustment but requires fine adjustment, the gas passage 36 is disconnected. A unit of a joint pipe 32 having a small area and an adjusting screw 14 having a small screw pitch is mounted.

(Other Embodiments) Chamber gas chamber 20 and communication hole as shown in FIGS. 1 and 2
It is also possible to provide both the structure having 25 and the structure having the replaceable joint pipe 32 and the adjusting screw 14 as shown in FIGS. 3 to 6.

(Effect of the invention) As described above, in the invention according to claim 1 of the present application, a chamber gas chamber 20 having a large volume is formed in the mixer body 1 so as to surround the venturi portion, and the chamber gas chamber 20 is provided with the adjuster mechanism. And a gas supply source, and a communication hole 25 for connecting and communicating the chamber gas chamber 20 and the annular gas passage 8 separately from the gas passage passing through the adjuster mechanism.
Therefore, by forming the communication holes 25 at any desired number of places, low calorie gas to high calorie gas can be handled without changing the specification itself of the adjusting screw 14.

Further, due to the presence of the chamber gas chamber 20, the influence of the change in the negative pressure on the gas side is buffered by the chamber gas chamber 20 even when the load is suddenly increased, and a stable gas can be supplied from the regulator.

The invention according to claim 2 of the present application, as an adjuster mechanism,
A joint pipe 32 for the adjuster, which is separate from the mixer body 1 and can be replaced, is attached, and an adjustment screw for adjusting the flow rate is attached to this.
Since 14 is screwed in, there is a difference between using a low calorie gas with a large required gas supply amount and using a high calorie gas with a small amount of gas supply amount but fine adjustment is required. The specifications corresponding to various gases can be changed only by changing the joint pipe 32 and the adjusting screw 14 without changing the entire mixer.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view (cross-sectional view taken along the line I-I of FIG. 2) of a gas engine mixer to which the invention according to claim 1 of the present application is applied.
1 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is a front view of a mixer of a gas engine to which the invention according to claim 1 of the present application is applied, and FIG.
4 is a sectional view taken along the line IV-VI of FIG. 3, FIG. 5 is a sectional view taken along the line VV of FIG. 4, and FIG. 6 is a sectional view taken along the line VI-VI of FIG. 1 ... Mixer body, 6 ... Intake passage, 6a ... Venturi passage section,
8: Annular gas passage, 14: Adjust screw, 20
…… Chamber gas chamber, 25 …… Communication hole, 32 …… Coupling pipe

Claims (2)

(57) [Claims] 1. An annular gas passage is formed around a venturi passage, and a gas ejection hole communicating with the annular gas passage and opening in the venturi passage is formed, and the annular gas passage is communicated with a gas supply source through an adjuster mechanism. In a mixer of a gas engine, a chamber gas chamber having a large volume is formed in the mixer body so as to surround a venturi portion, the chamber gas chamber is connected between the adjuster mechanism and a gas supply source, and gas passing through the adjuster mechanism is connected. A mixer for a gas engine, characterized in that a communication hole that directly communicates the chamber gas chamber with the annular gas passage is formed separately from the passage. 2. An annular gas passage is formed around the venturi passage and a gas ejection hole communicating with the annular gas passage and opening in the venturi passage is formed, and the annular gas passage is communicated with a gas supply source through an adjuster mechanism. A mixer for a gas engine, characterized in that, as an adjuster mechanism, a joint pipe for an adjuster that is separate and replaceable from the mixer body is attached, and a flow rate adjusting screw is screwed into the mixer pipe.