JPH07305622A - Exhaust emission control device for internal combustion engine - Google Patents

Abstract

PURPOSE:To reduce toxic exhaust gas concentration in exhaust gas without causing any lowering of an output and fuel consumption and reduce toxic exhaust gas concentration in the exhaust gas without being restricted by any kinds of fuel used, and prevent secondary contamination due to premium metal using for a catalytic device. CONSTITUTION:An ozonizer 3 comprising a cylindrical electrode 15 and a needle shaped electrode 21 located in a center of the cylindrical electrode 15 is mounted in an exhaust passage of an internal combustion engine. High field is applied between the cylindrical electrode 15 and the needle shaped electrode 21 to ozonize and ionize a part of the exhaust gas circulating in the cylindrical electrode 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purifying device for an internal combustion engine for automobiles and various industries.

[0002]

2. Description of the Related Art In an internal combustion engine such as a gasoline engine and a diesel engine, carbon monoxide (CO), nitrogen oxides (NOx), hydrocarbons (NOx), etc. In order to reduce the concentration of (HC) etc., a catalyst device of rare metal such as platinum, palladium etc. coated on the surface of the honeycomb core made of aluminum etc. in the path of exhaust gas is attached, and a catalyst of rare metal which exhaust gas contacts The action reduces the concentration of the harmful gas exhaust gas.

However, the above-mentioned catalyst device has a possibility that the output efficiency and the fuel consumption are deteriorated because the exhaust gas exhaust efficiency is deteriorated. Further, when this catalyst device is attached to a gasoline engine, there is a problem that leaded gasoline cannot be used. Furthermore, the rare metals used as catalysts also have the problem of causing secondary pollution.

The present invention was invented in order to solve the above-mentioned conventional drawbacks, and an object thereof is to reduce the harmful gas concentration in exhaust gas without lowering the output and fuel consumption. An object of the present invention is to provide an exhaust gas purifying apparatus for an internal combustion engine that can achieve the above.

Another object of the present invention is to provide an exhaust gas purifying apparatus for an internal combustion engine which can reduce the concentration of harmful gas in the exhaust gas without being restricted by the type of fuel used. .

Still another object of the present invention is to provide an exhaust gas purifying apparatus for an internal combustion engine which can prevent secondary pollution due to rare metals used in a catalyst device.

[0007]

Therefore, according to the present invention, an ozone generator comprising a cylindrical electrode and a needle-shaped electrode located at the center of the cylindrical electrode is provided in the exhaust path of an internal combustion engine, and an ozone generator is provided between these electrodes. It is characterized in that a high electric field is applied to partially ozoneize and ionize the exhaust gas flowing through the cylindrical electrode.

[0008]

Since the present invention is constructed as described above,
When the internal combustion engine is started, its exhaust gas is discharged into the atmosphere through the exhaust pipe and the ozone generator. Since a high electric field is applied between the cylindrical electrode and the needle electrode when the exhaust gas flows through the ozone generator, a part of the exhaust gas is ozonized and ionized. This oxidizes the harmful exhaust gas in the exhaust gas and electrically attaches it to the cylindrical electrode to reduce its concentration.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, a plurality of ozone generators 3 (two in the figure show this case) and a muffler are provided in an exhaust pipe 1 attached to an exhaust manifold (not shown) of an internal combustion engine. (Muffler) 5 is connected in series. The internal combustion engine may be either a gasoline engine or a diesel engine, and may be used for automobiles or power for various industries. Furthermore,
It may be an internal combustion engine in which a conventionally known catalyst device is mounted between the ozone generator 3 and the exhaust manifold.

The main body 7 of each ozone generator 3 is formed of a metal pipe having an outer diameter substantially matching the exhaust pipe 1, and a small diameter step portion 9 is provided on the outer peripheral surface of one end of the main body 7. A fixing ring 11 is supported on the small-diameter step portion 9 so as to be movable in the axial direction, and a screw 11a is formed on the inner peripheral surface of the end portion of the fixing ring 11. A screw 7a is formed on the inner peripheral surface of the other end of the main body 7.

Then, with respect to the exhaust pipe 1, a fixing ring 11 is inserted into a screw (not shown) formed on the peripheral surface of the end portion of the exhaust pipe 1, and is screwed to fix the ozone generator 3 located on the end side. Fix it. Further, for the ozone generator 3 fixed to the exhaust pipe 1, the screw 7 provided on the outer peripheral surface of the other end
The other ozone generator 3 is fixed by inserting the fixing ring 11 in the other ozone generator 3 into a and screwing it. As a result, a plurality of ozone generators 3 are detachably attached between the exhaust pipe 1 and the muffler 5.

A cylindrical insulator 13 having an electrically insulating characteristic is inserted into the body 7 of the ozone generator 3 from one end to an intermediate portion, and a cylindrical electrode 15 is formed on the inner peripheral surface of the cylindrical insulator 13.
Is inserted and fixed. The cylindrical electrode 15 is made of graphite, aluminum, etc.
5 is connected to a high voltage transformer (not shown). The high-voltage transformer is equipped with a battery voltage (DC 12V)
Alternatively, 24V) is transformed into about 20,000 to 80,000V. An insulator 17 having a through hole in the center is fixed to the middle portion of the main body 7, and an electrode wire 19 connected to the cylindrical electrode 15 is led to the outside in the through hole of the insulator 17 to connect to a high voltage transformer. It is connected.

An insulator 20 having a through hole at the center is inserted and fixed to the other end of the body of the ozone generator 3, and the insulator 19 is provided.
The needle electrode 21 is inserted and fixed in the through hole. The needle-shaped electrode 21 is made of, for example, tungsten and is formed in a substantially L-shape so as to face the center of the cylindrical electrode 15 from the outer periphery of the main body 7. The needle electrode 21 is grounded.

Next, the operation of the ozone generator 3 configured as described above will be described.

Now, when the internal combustion engine is started, its exhaust gas is discharged from the exhaust pipe 1 into the atmosphere through the respective ozone generators 3 and the silencer 5. When the exhaust gas flows through the ozone generators 3, the exhaust gas, especially carbon monoxide (CO), nitrogen oxides (NOx), due to the high electric field formed between the cylindrical electrode 15 and the needle electrode 21, A part of the hydrocarbon (HC) or the like is (-) ionized and electrically attached to the inner peripheral surface of the cylindrical electrode 15. In addition, since the high electric field formed between the cylindrical electrode 15 and the needle-shaped electrode 21 converts some of the remaining oxygen in the exhaust gas into ozone, the generated ozone causes carbon monoxide (CO) in the exhaust gas. , Nitrogen oxides (NOx), hydrocarbons (H
Oxidize harmful exhaust gas such as C) to reduce its concentration.

As a result, carbon monoxide in the exhaust gas
(CO), nitrogen oxides (NOx), hydrocarbons (HC) and other harmful exhaust gas concentrations can be reduced and purified. Further, even if the generated ozone is discharged into the atmosphere, it is naturally decomposed and returned to oxygen, so that the air can be purified.

In the above description, a plurality of ozone generators 3 are connected in series, but a plurality of cylindrical electrodes and a plurality of needle-shaped electrodes corresponding to the respective cylindrical electrodes are arranged in a single body. It may be one. Even in this case, the exhaust pipe 1 and the silencer 5 can be detachably attached.

In the above description, a plurality of ozone generators 3 are connected in series between the exhaust pipe 1 and the muffler 5, but
As shown in FIG. 3, a plurality (three in FIG. 3) of ozone generators 3 may be arranged in parallel. In this case, the pressure of the exhaust gas discharged from the exhaust pipe 1 can be divided to reduce the flow velocity of the exhaust gas in each ozone generator 3, and ozone and ions can be efficiently generated. be able to. When a plurality of ozone generators 3 are arranged in parallel, the fixing rings 11 are rotatable at both ends of each main body 7 and are attached in a state in which they do not come off. The ozone generator 3 can be removably attached between the first branch pipe 1a and the muffler 5 branch pipe 5a.

[0020]

Therefore, the present invention can reduce the harmful exhaust gas concentration in the exhaust gas without lowering the output and the fuel consumption.

Further, the present invention can reduce the harmful exhaust gas concentration in the exhaust gas without being limited by the type of fuel used.

Further, the present invention can prevent secondary pollution due to the rare metal used in the catalyst device.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of an exhaust gas purification device.

FIG. 2 is a cross-sectional perspective view of an ozone generator.

FIG. 3 is a perspective view showing an arrangement change example of an ozone generator.

[Explanation of symbols]

 1 Exhaust pipe 3 Ozone generator 5 Silencer 7 Main body 15 Cylindrical electrode 21 Needle electrode

Claims (5)

[Claims] 1. An ozone generator comprising a cylindrical electrode and a needle-shaped electrode located at the center of the cylindrical electrode is provided in an exhaust path of an internal combustion engine, and a high electric field is applied between these electrodes to flow in the cylindrical electrode. Exhaust gas purification device for internal combustion engine that ozone-ionizes and ionizes part of the exhaust gas. 2. The exhaust gas purifying apparatus for an internal combustion engine according to claim 1, wherein the internal combustion engine is a gasoline engine. 3. The exhaust gas purifying apparatus for an internal combustion engine according to claim 1, wherein the internal combustion engine is a diesel engine. 4. An exhaust gas purifying apparatus for an internal combustion engine according to claim 1, wherein a plurality of ozone generators are provided in series in an exhaust path of the internal combustion engine. 5. The exhaust gas purifying apparatus for an internal combustion engine according to claim 1, wherein a plurality of ozone generators are provided in parallel in the exhaust path of the internal combustion engine.