JPH044851Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention generally relates to an ultrasonic atomization device for atomizing liquid substances such as liquid fuel using ultrasonic vibration, and is applicable to gasoline engines and diesel engines. The present invention relates to an ultrasonic atomizer that can be suitably used in an intake pipe of an internal combustion engine such as an engine. The present invention is useful for atomizing liquid substances (in this specification, liquid substances include not only liquids such as liquid fuel, but also liquid substances such as suspended solutions) in various applications. Although it can be used in the ultrasonic atomization device, hereinafter, in this specification,
An ultrasonic atomizer used in the intake pipe of an internal combustion engine such as a gasoline engine or a diesel engine will be described.

Prior Art and its Problems In internal combustion engines such as gasoline engines and diesel engines, in order to obtain favorable engine performance, a liquid substance, ie, liquid fuel, injected into the intake pipe is atomized into extremely small droplet sizes, and air is It is preferable to supply the mixture to the combustion chamber of the engine.

Conventionally, an ultrasonic atomization device that atomizes liquid fuel using ultrasonic vibration is known as such a device that atomizes liquid fuel into extremely small droplet size. The atomizer is installed in the intake pipe, and the ultrasonic atomizer mixes fuel droplets atomized into extremely small droplet sizes with air in the intake pipe, and supplies the mixture to the combustion chamber of the engine. was.

However, as shown in FIG. 3, the conventional ultrasonic atomization device 30 is equipped with an ultrasonic vibration generating section 31 for emitting ultrasonic vibrations at the base, and this ultrasonic vibration generating section 31 has a long and narrow A horn portion 32 is connected to the elongated horn portion 32. The elongated horn portion 32 has an enlarged diameter portion 33 which has a leak-like shape and whose diameter increases toward its tip. Liquid fuel 37 injected from injection port 36 of 35
is formed to have an atomizing surface 34 for efficiently atomizing the liquid into atomized droplets 38 and diffusing them in a wide-angle direction by ultrasonic vibrations from the ultrasonic vibration generator 31.

When such an expanded diameter ultrasonic atomizer 30 is applied to an intake pipe of an engine, that is, as shown in FIG. The injection port 36 of the fuel injection valve 35 is disposed at a predetermined position on the intake pipe wall downstream of the throttle valve 42 (that is, close to the engine side).
However, in order to inject the liquid fuel 37 to the enlarged diameter portion 33 of the enlarged diameter ultrasonic atomizer 30, that is, the atomization surface 34, and to generate atomized droplets 38, a predetermined portion of the intake pipe wall is formed. The atomized droplets 38 are supplied to the combustion chamber of the engine 44 via the intake valve 43 located further downstream, and after a predetermined engine cycle is performed, the atomized droplets 38 are atomized into the engine. When the exhaust gas of
In the enlarged diameter part 33, that is, on the downstream side of the atomization surface 34,
Due to its funnel-shaped shape, a significant vortex 40 of the atomized atomized droplet-air mixture to be fed into the combustion chamber of the engine 44 is generated, and this vortex generation When fuel is supplied, various adverse effects have been caused on the responsiveness of the engine to the supplied fuel or on the performance of the engine.

For example, due to the generation of this vortex, the atomized liquid atomized by the ultrasonic atomizer may adhere to the intake pipe wall, or the intake resistance of the engine 44 to the intake of this air-fuel mixture into the engine combustion chamber. There was a problem in that the intake efficiency of the engine 44 decreased as a result. The present invention has been made in view of the above viewpoints.

Purpose of the invention Therefore, the purpose of the present invention is to provide an enlarged diameter ultrasonic atomizer for atomizing fuel from a fuel injection valve on an atomization surface to produce atomized droplets. It is an object of the present invention to provide an ultrasonic atomization device that prevents the generation of vortices in atomized droplets when used in a small diameter pipe.

Another object of the present invention is to use an enlarged diameter ultrasonic atomizer for a small diameter pipe such as an intake pipe to atomize fuel from a fuel injection valve on an atomization surface to produce atomized droplets. An object of the present invention is to provide an ultrasonic atomizer that reduces the intake resistance of an engine to atomized droplets.

Another object of the present invention is to use an enlarged diameter ultrasonic atomizer for a small diameter pipe such as an intake pipe to atomize fuel from a fuel injection valve on an atomization surface to produce atomized droplets. Therefore, it is an object of the present invention to provide an ultrasonic atomization device that increases the intake efficiency of an engine for atomized droplets.

Another object of the present invention is to use an enlarged-diameter ultrasonic atomizer for atomizing the fuel from the fuel injection valve on the atomization surface to produce atomized droplets in small diameter pipes such as intake pipes. In this case, it is an object of the present invention to provide an ultrasonic atomization device that prevents atomized droplets from adhering to the inner wall surface of a pipe.

Another object of the present invention is to use an enlarged diameter ultrasonic atomizer for a small diameter pipe such as an intake pipe to atomize fuel from a fuel injection valve on an atomization surface to produce atomized droplets. An object of the present invention is to provide an ultrasonic atomizer that can sufficiently supply atomized droplets to a combustion chamber of an engine without adhering the atomized droplets to the inner wall surface of the pipe.

Another object of the present invention is to use an enlarged diameter ultrasonic atomizer for a small diameter pipe such as an intake pipe to atomize fuel from a fuel injection valve on an atomization surface to produce atomized droplets. An object of the present invention is to provide an ultrasonic atomizer that improves responsiveness to the supplied fuel when liquid fuel is supplied, and therefore improves the responsiveness of the engine to the supplied fuel when used in the intake pipe of an engine. An object of the present invention is to provide an ultrasonic atomization device that improves the performance of the invention.

Means for Solving the Problems The above objects are achieved by the ultrasonic atomization device according to the present invention. In summary, the present invention includes an ultrasonic vibration generating section for emitting ultrasonic vibrations, and a horn section connected to the ultrasonic vibration generating section and having a funnel-shaped enlarged diameter section whose diameter increases toward the tip. An ultrasonic atomization device comprising: the enlarged diameter section having an atomization surface for atomizing the supplied liquid fuel by ultrasonic vibration from the ultrasonic vibration generation section; Further, the ultrasonic atomization device is provided with a vortex generation prevention means attached to the tip of the enlarged diameter portion.

Here, in a preferred embodiment, the vortex generation prevention means is a substantially conical member or a substantially half-spindle-shaped member, and further, between the ultrasonic atomization device and the vortex generation prevention means attached thereto. A vibration isolating member is interposed therein.

Further, the eddy current generation prevention means may be supported by a support member disposed in a small diameter pipe in which the ultrasonic atomization device is disposed so as to face the tip of the enlarged diameter portion, and , a vibration isolating member is interposed between the ultrasonic atomizer and the vortex generation prevention means disposed in the small diameter pipe by a support member so as to face the tip of the enlarged diameter portion thereof. ing.

Embodiments Hereinafter, the present invention will be described based on embodiments thereof with reference to the accompanying drawings. FIG. 1a is a schematic cross-sectional view of an embodiment of the ultrasonic atomization device of the present invention.

Referring to FIG. 1a, an ultrasonic atomizer 10 according to the present invention is equipped with an ultrasonic vibration generating section 11 for emitting ultrasonic vibrations at the base, and this ultrasonic vibration generating section 11 includes an elongated horn. This elongated horn part 12 has a funnel-shaped enlarged diameter part 13 whose diameter increases toward its tip, and this enlarged diameter part 13 is connected to a fuel injection valve. It has an atomization surface 14 for efficiently atomizing the liquid fuel injected from the injection port into atomized droplets and diffusing it in a wide angle direction by ultrasonic vibrations from the ultrasonic vibration generator 11. ing.

Funnel-shaped atomization surface 14 of this ultrasonic atomization device 10
Preferably, a conical member 16 serving as means for preventing generation of eddy currents is attached to the tip end of the conical member 16 via a vibration isolating member 15. This conical member 16 is, for example,
The bottom side in contact with the tip of the atomizing surface 14 has approximately the same diameter as the atomizing surface 14, 18.0 mm, and the height is 23.0 mm.

The operation of the ultrasonic atomizer of the present invention having the above configuration will be described below.

When such an ultrasonic atomizer 10 is applied to an intake pipe of an engine, that is, as shown in FIG. The injection port 36 of the fuel injection valve 35 is arranged at a predetermined position on the intake pipe wall downstream (that is, close to the engine side) of the 14 at a predetermined position on the wall of the intake pipe so as to be able to inject liquid fuel 37 to produce atomized droplets 38, and thus atomize the atomized droplets 38 further downstream. Engine 44 via intake valve 43
After the exhaust gas in the engine is supplied to the combustion chamber of the exhaust pipe 4 and a prescribed engine cycle is performed,
When discharging to the outside via 5,
Now, when the ultrasonic atomizer of the present invention is in operation, the liquid fuel is flowing into the ultrasonic atomizer 1 at a predetermined distance of, for example, 30.0 mm from the fuel injection port of the fuel injection valve.
With a predetermined liquid injection flow rate and flow velocity, for example, liquid injection flow rate of 1 to 2 c.c./
When the liquid fuel is injected at a flow rate of 20 m/sec, the liquid fuel is atomized at the atomization surface 14, and the atomized fuel is mixed with air while being diffused in a wide angle direction within the intake pipe 11. , proceeding downstream in the intake pipe.

At this time, when the atomized fuel advances downstream of the intake pipe, the conical member 16 attached to the tip of the funnel-shaped atomizing surface 14 of the ultrasonic atomizer 10 via the vibration isolating member 15 Therefore, the atomized fuel atomized on the atomization surface 14 can smoothly travel along the outer surface of the conical member 16, thereby preventing the generation of eddies. Therefore, the intake resistance of the engine can be reduced and the intake efficiency of the engine can be increased. Furthermore, by preventing the generation of vortices, it is possible to eliminate the effects of turbulence and the like, and to prevent the atomized fuel from adhering to the inner wall surface of the pipe. As a result, the mixture of air flow and atomized fuel is sufficiently supplied to the combustion chamber of the engine without adhering to the inner wall surface of the pipe, and the responsiveness of the engine to the supplied fuel is improved.

FIG. 1b is a schematic sectional view of another embodiment of the ultrasonic atomization device of the present invention.

In this embodiment, a vortex flow is installed at the tip of the funnel-shaped atomization surface 14 of the ultrasonic atomization device 10 via a vibration isolating member 15 instead of the conical member in the embodiment shown in FIG. 1a. A half-spindle-shaped member 17 is attached as a means for preventing occurrence. The rest of the structure is exactly the same as the structure of the embodiment shown in FIG. 1a, so the same reference numerals are given to the same members or parts, and the explanation will be omitted.

In this case as well, the effect is similar to that described for the embodiment of FIG. 1a. That is, when the ultrasonic atomizer 10 of the present invention is disposed in the intake pipe 41 as shown in FIG. Liquid fuel is injected from the fuel injection port of the fuel injection valve at a predetermined liquid injection flow rate and flow velocity onto the atomization surface 14 of the ultrasonic atomization device 10 that is a predetermined distance away, similar to the above embodiment. Then, this liquid fuel is atomized on the atomization surface 14, and the atomized fuel is mixed with air while being diffused in a wide angle direction within the intake pipe 11, and advances downstream of the intake pipe.

At this time, when the atomized fuel advances downstream of the intake pipe, the semi-spindle-shaped member 17 attached to the tip of the ultrasonic atomizer 10 causes the atomized fuel to move downstream of the intake pipe.
The atomized fuel atomized on the atomization surface 14 travels smoothly along the outer surface of the semi-spindle-shaped member 17, thereby preventing the generation of vortices. Therefore, the intake resistance of the engine can be reduced and the intake efficiency of the engine can be increased. Furthermore, by preventing the generation of vortices, it is possible to eliminate the effects of turbulence, etc., and prevent the atomized fuel from adhering to the inner wall surface of the pipe. The fuel is sufficiently supplied to the combustion chamber of the engine without adhering to the wall surface, and the response of the engine to the supplied fuel is improved.

In addition, in these embodiments described above, in order to attach the conical member 16 and the half-spindle-shaped member 17, which serve as vortex generation prevention means, to the tip of the ultrasonic atomizer 10, for example, as shown in FIG. , intake pipe 4
The conical member 16 and the semi-spindle member 17 are supported by a thin filament-like support member 18, which does not generate a vortex, and which is attached to the bottom edge of the conical member 16 and the semi-spindle member 17 to form a funnel-like enlarged diameter shape. It may be attached so as to match the tip of the ultrasonic atomizer 10. At that time, an enlarged diameter ultrasonic atomizer and a conical member 1 which is a means for preventing generation of vortex installed therein.
6 and the half-spindle-shaped member 17, a vibration isolating member may be interposed.

In this way, even when the vortex generation prevention means disposed in the intake pipe and the enlarged-diameter ultrasonic atomization device are arranged in cooperation, the same effects as in the embodiments described above can be obtained.

Effects of the Invention As explained above, according to the ultrasonic atomization device of the present invention, the vortex generation prevention device is attached to the tip of the funnel-shaped atomization surface of the ultrasonic atomization device via a vibration isolating member. By the means, the atomized fuel atomized on the atomization surface of the ultrasonic atomizer can smoothly advance along the outer surface of the vortex generation prevention means without impairing the performance of the ultrasonic atomizer. This makes it possible to prevent the generation of vortices, thereby reducing the intake resistance of the engine and increasing the intake efficiency of the engine. Furthermore, by preventing the generation of vortices, it is possible to eliminate the effects of turbulence and the like, and to prevent the atomized fuel from adhering to the inner wall surface of the pipe. As a result, the mixture of air flow and atomized fuel is sufficiently supplied to the combustion chamber of the engine without adhering to the inner wall surface of the pipe, and the responsiveness of the engine to the supplied fuel is improved.

[Brief explanation of drawings]

FIG. 1a is a schematic sectional view of an embodiment of the ultrasonic atomization device of the present invention. FIG. 1b is a schematic sectional view of another embodiment of the ultrasonic atomization device of the present invention.
FIG. 2 is a schematic cross-sectional view of another embodiment of the ultrasonic atomization device of the present invention, which cooperates with a vortex generation prevention means disposed in a small diameter pipe such as an intake pipe. Figure 3 shows
It is a schematic sectional view of an example of a conventional ultrasonic atomization device. FIG. 4 is a schematic cross-sectional view of an example in which the conventional ultrasonic atomization device shown in FIG. 3 is used in a small diameter pipe such as an intake pipe. 10... Ultrasonic atomization device, 11... Ultrasonic vibration generator, 12... Horn part, 13... Expanded diameter part, 1
4... Atomization surface, 15... Vibration isolation member, 16, 17...
... Eddy current generation prevention means, 18... Support member, 41...
...Small diameter pipe.

Claims (1)

[Claims for Utility Model Registration] 1. Includes an ultrasonic vibration generating section for emitting ultrasonic vibrations, and a funnel-shaped enlarged diameter section connected to the ultrasonic vibration generating section, the diameter of which increases toward the tip. an ultrasonic atomizer comprising a horn section, the enlarged diameter section having an atomization surface for atomizing the supplied liquid fuel by ultrasonic vibrations from the ultrasonic vibration generation section. The ultrasonic atomizer further comprises: a vortex generation prevention means attached to the tip of the enlarged diameter portion. 2. The ultrasonic atomization device according to claim 1, wherein the vortex generation prevention means is a substantially conical member or a substantially semi-spindle-shaped member. 3. The ultrasonic wave according to claim 1 or 2, wherein a vibration isolating member is interposed between the ultrasonic atomizer and the vortex generation prevention means attached to the ultrasonic atomizer. Atomization device. 4. The vortex generation prevention means is supported by a support member disposed in a small diameter pipe in which the ultrasonic atomization device is disposed so as to face the tip of the enlarged diameter portion. Claims Paragraph 1～
The ultrasonic atomization device according to any one of Item 3. 5. A vibration isolating member is interposed between the ultrasonic atomizer and the vortex generation prevention means disposed in the small diameter pipe by a support member so as to face the tip of the enlarged diameter portion thereof. The ultrasonic atomization device according to claim 4, which has been registered as a utility model.