JPH0144772Y2 - - Google Patents

Description

[Detailed description of the invention] <Field to which the technology pertains> The present invention relates to a mixture supply device for a gas engine that uses gas such as city gas or LP gas as fuel. It is an object of the present invention to easily and inexpensively manufacture a plurality of types of air-fuel mixture supply devices with different types.

<Conventional Examples and Problems> Conventionally, a mixer for mixing fuel gas and air was manufactured as an independent component and interposed between the air cleaner and the intake port.

However, when manufacturing multiple types of air-fuel mixture supply devices that have different characteristics depending on the type of engine or fuel gas, it is necessary to prepare various mixers, which requires time and effort to process and assemble the mixers. In addition, the number of parts increases, making it expensive.

The present invention eliminates the above-mentioned drawbacks by incorporating a bench lily tube and a throttle valve into the intake pipe, thereby omitting the mixer.
Connect the intake pipe 14 and the air cleaner 15 in order to the tip opening 10a of the
and a throttle valve assembly part S, which is inserted into the bench lily assembly part from the open end 14b of the bench lily cylinder 18 and the intake pipe 14 and fixed by the fixing means 20,
The fuel supply nozzle 19 is made to face inside the bench lily cylinder 18, and the throttle valve 32 is provided in the throttle valve assembly part so as to be able to swing open and close.

Since the present invention is configured as described above, it has the following effects.

That is, by simply selecting an appropriate small bench lily cylinder from a plurality of types and incorporating it into the intake pipe, a mixture supply device having desired characteristics among the plurality of types can be manufactured easily and inexpensively.

Furthermore, by omitting the large cylindrical body of the conventional mixer and the mixer connection structure, the number of parts and the labor for processing and assembly can be greatly reduced, and manufacturing costs can be reduced.

In addition, the size of the air cleaner protruding from the engine body can be reduced by the size of the cylinder body of the mixer, thereby making it possible to reduce the overall external size of the engine.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a longitudinal sectional front view of a vertical water-cooled gas engine. This engine 1 is integrally formed with a cylinder block 4 in which a piston 3 is vertically slidably housed above a crankcase 2. A cylinder bush head 5 and a rocker arm cover 6 are placed and fixed in this order on the upper part of the cylinder head 5.

A piston 3 housed in a cylinder block 4 is connected to a crankshaft 8 by a connecting rod 7, and a fuel chamber 9 is formed above the piston 3.

This fuel chamber 9 has intake and exhaust valves 1 at an intake port 10 and an exhaust port 11 formed in the cylinder head 5.
They are communicated via 2.

At the tip opening 10a of the intake port 10, an intake pipe 14 is provided with a gas fuel mixing device 13 installed therein.
The proximal end 14a of the intake pipe 14 is attached.
An air cleaner 15 is attached to the tip of the combustion chamber 9, and an intake passage W is formed between the air cleaner 15 and the combustion chamber 9.

The fuel mixing device 13 installed in the intake pipe 14 is constructed as shown in FIGS. 1 and 2.

That is, the inner proximal end portion of the intake pipe 14 is formed to have a large diameter with different steps, and the bench lily mounting portion V and the throttle valve mounting portion S are formed in series, and the bench lily pipe 18 is formed in a cylindrical shape at the bench lily mounting portion. is inserted and fixed with a set screw (fixing means) 20, and the throttle valve is built into the throttle valve assembly part so as to be able to swing open and close.The fuel supply nozzle 19 is made to face the bench lily cylinder 18.

This fuel supply nozzle 19 is communicated with a gas fuel source 24 via a pressure regulator 21 and an electromagnetic on-off valve 22, and a fuel regulator 23 is provided in a fuel passage 25 near the fuel supply nozzle 19.

When the fuel mixing device 13 is configured as described above,
When changing the mixing characteristics of the fuel mixing device 13 depending on the engine 1 and the type of fuel gas, the set screw 20 that fixes the vent lily portion 18 to the intake pipe 14 is unscrewed, and the fuel supply nozzle 19 is connected to the vent lily tube 18. Then, the throttle valve 32 provided on the leeward side of the bench lily portion 18 is removed from the intake pipe 14, and then the bench lily cylinder 18 is taken out from the intake pipe 14.

Next, a bench lily cylinder 18 with mixing characteristics suitable for the engine 1 and the type of fuel gas is inserted from the opening 14b near the base end of the intake pipe 14 to the vent lily assembly part V, and is fixed with a set screw 20, and the fuel supply nozzle is fixed. 19 facing the bench lily part 18 and then reinstalling the throttle valve 32 into the throttle valve assembly part S in the intake pipe 14 on the leeward side of the bench lily part 18, it is easy to change the mixing characteristics of the fuel mixer 13. can be done.

Further, the electromagnetic on-off valve 22 provided between the fuel supply nozzle 19 and the gas fuel source 24 opens when the electric current from the battery 27 is supplied from the on-off control device 26, and the electromagnetic on-off valve 22 is opened to supply the fuel gas from the gas fuel source 24 as fuel. It is adapted to be fed to a supply nozzle 19.

As shown in FIG. 3, the opening/closing control device 26 includes a valve opening circuit 28 that operates in conjunction with the main switch 27 and opens the electromagnetic opening/closing valve 22 during startup and operation, and a valve closing circuit 29 that closes the electromagnetic opening/closing valve 22 when the engine 1 is stopped. When the main switch 27 is set to the operating position 30 and the starting position 31, the valve opening circuit 28 opens, respectively.
Relays R ₁ and R ₂ that operate ON and relays R ₁ and R ₂
Relay for starting a timer that turns ON in conjunction with ON operation.
_R3 and timer relay _R4 , and the valve closing circuit 29 is composed of a relay _R5 that cuts off the current to the electromagnetic on-off valve 22 when the detector 33 detects that the rotation of the engine 1 has stopped. be.

In the opening/closing control device configured as above, when the main switch 27 is turned on and relays R ₁ and R ₂ are activated, the contacts r ₁ and r ₂ of the relays R ₁ and R ₂ are closed and the timer is started. relay R ₃ is turned on, and at the same time, current from the battery 27 is supplied to the electromagnetic on-off valve 22 to open it, and the negative pressure in the intake pipe 14 causes the fuel gas from the gas fuel source 24 to flow from the fuel supply nozzle 19. It is sucked out into the intake pipe 14.

When timer relay R ₄ opens its contact r ₄ due to time-limited operation, relay R ₅ in valve closing circuit 29 is controlled ON and OFF by rotation stop detector 33 of engine 1 if engine 1 is rotating normally. is operating, and current from battery 27 flows from contact r ₅ to electromagnetic on-off valve 2.
2, the electromagnetic on-off valve 22 is kept open.

Conversely, if the engine 1 fails to start or stops for some reason while the engine 1 is running, no current is supplied from the rotation stop detector 33 to the photocoupler 34, and power is supplied to the relay _R5 in the valve closing circuit 29. is cut off, the contact _r5 opens, and the power supply to the electric power on-off valve 22 is stopped.

In this way, when the engine 1 stops, the electric fuel on/off valve 22 automatically closes, so the gas fuel source 2
The fuel gas No. 4 is prevented from leaking to the outside from the intake pipe 14, and explosion accidents due to gas leakage can be prevented.

4 and 5 show different embodiments, and the one shown in FIG. 4 has four intake ports 10 opened on one side of the cylinder head 5 of a four-cylinder engine 1 for intake air. The fuel mixing device 13 is provided at a converging portion 35 of two forked intake pipes 14 which are made into a set so that the process is continuous.

Furthermore, the one shown in Fig. 5 is a four-cylinder engine 1.
A fuel mixing device 13 is provided in each branch pipe 14c of the intake manifold 14 connected to each intake port 10.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional front view of a vertical water-cooled gas engine, FIG. 2 is an enlarged view of a portion of FIG. 1, FIG. 3 is an electric circuit diagram of the opening/closing control device, and FIG. 4 and FIG. 5 are cross-sectional schematic plan views of main parts showing different embodiments. 1...Engine, 10...Intake port, 10a
...10 tip opening, 14...intake pipe, 14b
...14 opening, 15... air cleaner, 18
... Bench lily part, 19 ... Fuel supply nozzle, 2
0... Fixing means (set screw), 32... Throttle valve, W... Intake path.

Claims (1)

[Scope of utility model registration request] Tip opening 10 of intake port 10 of engine 1
Connect the intake pipe 14 and the air cleaner 15 in order to a, form a bench lily assembly part V and a throttle valve assembly part S in the intake pipe, and insert the vent lily cylinder 18 from the open end 14b of the intake pipe 14 into the bench lily assembly part. the bench lily tube 1 and fix it with the fixing means 20.
8, a fuel supply nozzle 19 is exposed therein, and a throttle valve 32 is provided in a throttle valve assembly part so as to be able to swing open and close.