JPH0333467A - Mixture gas supply device of internal combustion engine - Google Patents

Abstract

PURPOSE:To obtain a desired high output power by furnishing a step for liquid cutting in a suction pipe, thereby enhancing the mixing of superparticulate fuel with the air without causing attachment of the fuel to the pipe wall, and increasing the transport speed of the mixture gas. CONSTITUTION:A mixture gas supply device 1 is composed of a suction pipe 2 having a funnel 2a as an air intake and mounting cylinders 2b, 2c, an ultrasonic atomizing device 3 fixed in the mounting cylinder 2b, and a fuel injection valve 5 fixed in the other mounting cylinder 2c. A liquid cutting member 7 is provided downstream this ultrasonic atomizing device 3. The rate of fuel flow is controlled by the fuel injection valve 5, and injection is made so that the fuel runs against the spherical portion 3a of the atomizing device 3. The fuel drops attached to the suction pipe 2 flows to downstream as creeping on the wall of the suction pipe 2, and by the liquid cutting member 7 they are diffused and mixed in the mixture gas.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mixture supply device for an internal combustion engine that uses an ultrasonic atomizer to mix fuel and air.

[Conventional technology]

Conventionally, a method is known in which an ultrasonic injection valve is disposed in the intake pipe of an internal combustion engine to atomize fuel and mix it with intake air to supply an air-fuel mixture to the carrot.

For example, in Japanese Patent Application Laid-Open No. 53-140418,
A proposal has been made to arrange a fuel supply device and a ring-shaped ultrasonic vibrator in the intake pipe passage to improve mixing of intake air and ultra-atomized fuel obtained by the ring-shaped ultrasonic vibrator.

[Problems that the invention aims to solve]

However, in the conventional system described above, the fuel supply device and the ultrasonic vibrator are placed close to the engine side of the intake pipe passage, resulting in unstable airflow and mixing of the intake air and ultra-atomized fuel. The problem is that the fuel gets stuck on the pipe wall. Particularly in high-output engines, if fuel adheres to the pipe wall, the transport speed of the air-fuel mixture decreases during pick-up when the engine rapidly accelerates from a low speed, resulting in a problem in that the desired output cannot be obtained.

An object of the present invention is to solve the above-mentioned problems, and to improve the mixing of ultra-atomized fuel and air to increase the conveyance speed without the fuel adhering to the pipe wall.

[Means to solve the problem]

To this end, the air-fuel mixture supply device for an internal combustion engine of the present invention includes an ultrasonic atomizer 3 disposed within the intake pipe 2 of the internal combustion engine;
It consists of a fuel injection valve 5 that supplies fuel to the ultrasonic atomization device, and a step 7.9 for draining liquid is provided on the inner wall of the intake pipe 2, and the step is placed downstream of the ultrasonic atomization device. It is characterized by having been provided.

Note that the numbers added to the above configurations are for comparison with the drawings, and the configurations of the present invention are not limited thereby.

[Effect]

In the present invention, outside air is taken in through the intake pipe 2, and the flow velocity increases in the funnel portion 2a where the passage cross section is narrowed. On the other hand, the flow rate of the fuel is controlled by the fuel injection valve 5, and the fuel is injected so as to collide with the spherical portion 3a of the ultrasonic atomizer 3. At this time, since the ultrasonic atomizer 3 generates ultrasonic vibrations using the electroacoustic transducer, the fuel is atomized and atomized toward the air flowing through the funnel portion 2a, and is well mixed with the air. The fuel droplets attached to the intake pipe 2 flow downstream along the wall of the intake pipe 2, and the fuel droplets are diffused and mixed into the air-fuel mixture by the liquid draining member 7.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a mixture supply device attached to an intake manifold of an engine.

The air-fuel mixture supply device 1 includes a funnel portion 2 which is an air intake portion.
an intake pipe 2 having a mounting cylinder part 2bs2c, an ultrasonic atomizer 3 disposed and fixed in the mounting cylinder part 2b,
It consists of a fuel injection valve 5 disposed and fixed within the mounting cylinder portion 2c.

The ultrasonic atomizer 3 and the fuel injection valve 5 are arranged upstream of a slide valve 6 that is linked to an accelerator pedal. The ultrasonic atomizer 3 is provided to protrude into the intake pipe 2, and the tip nozzle portion 5a of the fuel injection valve 5 is located upstream from the center of the spherical portion 3a of the ultrasonic atomizer 3. They are arranged to face each other and are formed so that the fuel collides with the spherical portion 3a. Furthermore, a liquid draining member 7 is fixed to the downstream side of the ultrasonic atomizer 3.

The operation of the air-fuel mixture supply device 11 of the present invention having the above configuration will be explained. Outside air is taken in through the funnel part 2a of the intake pipe 2, and the funnel part 2a has a narrowed passage cross section.
The flow velocity increases at .

On the other hand, the flow rate of the fuel is controlled by the fuel injection valve 5, and the fuel is injected so as to collide with the spherical portion 3a of the ultrasonic atomizer 3. At this time, since the ultrasonic atomizer 3 generates ultrasonic vibrations using the electroacoustic transducer, the fuel is atomized and atomized toward the air flowing through the funnel portion 2a, and is well mixed with the air.

The fuel droplets adhering to the intake pipe 2 flow downstream along the wall of the intake pipe 2, but the fuel droplets are diffused and mixed into the air-fuel mixture by the liquid draining member 7.

FIG. 2 shows another embodiment of the present invention, in which a stepped portion 9 is provided in the intake pipe 2 to diffuse and mix fuel droplets into the air-fuel mixture.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made.

For example, in the above embodiment, the ultrasonic atomizer 3 is placed upstream of the slide valve 6, but the ultrasonic atomizer 3 may be placed downstream of the slide valve.

Further, in the above embodiment, an example is shown in which an ultrasonic atomizer is used, but the present invention may also be applied to a fuel supply system using only a fuel injection valve or a fuel supply system using a carburetor.

〔Effect of the invention〕

As described above, according to the present invention, since the intake pipe is provided with a step for draining liquid, it is possible to improve the mixing of the ultra-atomized fuel and air without the fuel adhering to the pipe wall. Particularly in high-output engines, when the pickup is rapidly accelerating from a low speed, fuel is prevented from adhering to the pipe wall, the air-fuel mixture conveying speed is increased, and the desired output can be obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a mixture supply device for an internal combustion engine according to the present invention, and FIG. 2 is a cross-sectional view showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Air mixture supply device, 2... Intake pipe, 3... Ultrasonic atomization device, 5... Fuel injection valve, 7... Liquid draining member, 9... Step part. Applicant Toa Fuel Industries Co., Ltd.

Claims (1)

[Claims] (1) Consisting of an ultrasonic atomizer installed in the intake pipe of an internal combustion engine and a fuel injection valve that supplies fuel to the ultrasonic atomizer, a step for draining liquid is provided on the inner wall of the intake pipe. A mixture supply device for an internal combustion engine, characterized in that the step is provided on the downstream side of the ultrasonic atomization device.