JPS58214657A - Exhaust gas recirculation apparatus equipped with filter in exhaust gas discharge passage - Google Patents

Abstract

PURPOSE:To remove carbon in the recirculation gas and increase the amount of reciruclation by installing the first cyclone in an exhaust recirculation passage and a filter for generating back-pressure on the downstream part of the branched part for exhaust recirculation passage in an exhaust passage. CONSTITUTION:A portion of the exhaust gas discharged from an exhaust manifold 3 is introduced into the dust collecting trunk 7 of the first cyclone through recirculation pipes 5a, 5b and 5c and minifilters 6a and 6b and carbon particles are removed by the corona discharge generated from a high-voltage insulated cable 7i. Then, the exhaust gas is recirculated into an intake manifold 2 equipped with an ion generator 12. While, a filter 15 filled with ceramic material and the dust collecting trunk 7 of the second cylone are installed onto an echaust pipe 4, and the exhaust gas recirculation quantity is increased by the back-pressure action.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a so-called EGR system that recirculates exhaust gas discharged from an engine mounted on a vehicle, etc., and is equipped with a filter in the exhaust path of the exhaust gas.
Effectively utilizes the back pressure related to the filter,
The present invention relates to an exhaust gas recirculation device equipped with a filter in the exhaust gas exhaust path to improve the combustion efficiency of an engine.

BACKGROUND ART Conventionally, an EGR system (exhaust gas recirculation system) has existed in this type of engine, and has been designed to improve the combustion efficiency of the engine.

However, with the EGR system of such an engine, it is not possible to increase the amount of exhaust gas that needs to be recirculated.
As a result, there was a problem in that the desired combustion efficiency of the engine could not be achieved.

The present invention has been devised to solve this problem, and includes a filter filled with a porous material such as a ceramic material in the exhaust path for exhaust gas discharged into the atmosphere from the exhaust gas hold, and the exhaust gas flows through this filter. This is a new technology that increases the amount of exhaust gas flowing into the exhaust gas recirculation path due to the back pressure generated when the exhaust gas recirculates, thereby improving the combustion efficiency of the engine and removing dust from carbon substances contained in the exhaust gas. The object of the present invention is to provide an exhaust gas recirculation device equipped with a filter in the exhaust gas exhaust path.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, one embodiment of an exhaust gas recirculation device including a filter in an exhaust gas discharge path according to the present invention disclosed in the accompanying drawings will be described in detail.

FIG. 1 is an overall configuration diagram showing an engine, an exhaust gas recirculation path, and an exhaust gas discharge path of a device according to the present invention.

FIG. 2 is a configuration diagram of a cyclone dust collection section arranged in the exhaust gas recirculation path of the apparatus according to the present invention. FIG. 3 is an external configuration diagram of the intake manifold hold of the device according to the present invention. Fourth
The figure is a configuration diagram of a filter disposed in the exhaust gas discharge path of the device according to the present invention.

Reference numeral 1 denotes an engine body, which is mounted on a vehicle, a ship, or the like. Reference numeral 2 denotes an intake manifold connected to a combustion chamber provided in the engine body 1.

The intake mataport 2 forms an outside air intake hole 2a, and introduces outside air. Further, the intake mawarboard 2 is composed of three intake branch pipes 2b to 2d, as shown in FIG. Reference numeral 3 denotes an exhaust pipe (bold), which is used to flow and guide the exhaust gas discharged from the engine body 1 after combustion. The exhaust marball!・3 has a generally branched structure. Reference numeral 4 denotes an exhaust pipe, which is connected to the exhaust machine hole 3 and allows part of the exhaust gas to flow through.

5a, 5b, and 5c are reflux tubes, respectively, and the reflux tube 5
A is branched and connected to the outlet of the exhaust machine board 3, and has the function of recirculating a part of the exhaust gas. 6a and 6b are mini filters, and both are connected via a reflux pipe 5b.

The mini filters 6a, 6b are filled with a porous material such as a ceramic material. Reference numeral 7 designates a first cyclone dust collecting drum, which is equipped with an introduction pipe 7a, and the introduction pipe 7a is connected to a reflux pipe 5c.

Reference numeral 7b denotes a Cottrell tube which is disposed protrudingly above and on the axis of the first cyclone dust collecting drum 7, and a discharge wire 7c is stretched inside the tube.

Further, a high voltage insulated cable 7d is connected to one end of the discharge wire 7c, and an insulating tube 7e is further wrapped around the high voltage insulated cable 7d. 7f is a dust collection section, which is removably installed at the bottom of the 11th Noicron dust collection cylinder 7, and collects dust particles such as carbon particles and black smoke particles contained in the exhaust gas by a corona discharge phenomenon. It collects dust by falling down. That is, if a predetermined amount of the dust particles accumulate on the dust collecting section 7f, the dust collecting section 7f
f is removed from the first cyclone dust collecting drum 7, the dust particles are removed, and then fixed to the first cyclone dust collecting drum 7 again. 7g is a lead-out pipe, which is connected to the upper side of the rail pipe 7b.

7h is an insulator, which is fixed to the upper end of the Cottrell tube 7b. A high voltage insulated cable 71 is connected to the other end of the discharge wire 7c via an insulator 7h.

8 is a high voltage generator, which is connected to a high voltage insulated cable 7j.

9 is a DC power supply, which is connected to the high voltage generator 8. 7j is an insulating tube surrounding the high-voltage insulated cable 71. 1o is a reflux cooling pipe, one end of which is connected to the outlet of the outlet pipe 7g, and the other end connected to the exhaust gas introduction pipe 11 which is connected to the intake magbold 2. As shown in Figure 3, on the side of the intake manbold 2,
Two ion generators 12.12 are arranged, and the ion generators 12.12 have ion needles 12a and 1 at their tips.
2a, and insulators 12b, 12b are integrally formed on the main body. Furthermore, two ion needle attachment holes 2e, 2e are provided on the side surface of the intake map board 2, into which the ion needles 12a+12a are inserted and fixed. 2f
is a high voltage electric wire, and one end has a coupler 2g.

2g to the ion generator 12.12.

The other end is connected to a high voltage generator 13. 14
is a DC power supply and is connected to the high voltage generator 13.

Reference numeral 15 denotes a filter, which is connected to the exhaust Madaport 31 via the exhaust pipe 4. The filter 15 has a cylindrical case body filled with granular ceramic material 15a, as shown in FIG. 4, for example. The ceramic material $115
a constitutes a porous material, forming a so-called mesh. A glow plug 15b and a fuel injection pipe 15c are arranged on the surface of the filter 15. The claw plaque 15
A current-carrying wire 15d is connected to b, and the glow plug 15b is activated by applying a voltage. When the exhaust gas is passed through the exhaust pipe 4 from the exhaust made hold 3, the filter 15 causes carbon substances contained in the exhaust gas to adhere, and back pressure is generated to remove the exhaust gas that has passed through the filter 15. It has the function of returning. 16 is an exhaust pipe, and the filter 1
It is connected to the output end of 5.

Reference numeral 15e denotes a filter screen, which is disposed at the input port of the filter 15.

Reference numeral 17 denotes a second re-aircraft dust collection barrel, which is connected to the exhaust pipe through its upper side surface. Reference numeral 18 denotes an exhaust pipe, one end of which is connected to the upper surface of the axis of the second Zykron dust collection cylinder 17, and the other end connected to a muffler (not shown).

In the figure, 19 is a propeller shaft, which is used to transmit the output of the engine.

Next, the action will be explained.

The engine starts, fuel burns in the combustion chamber of the engine body 1, and exhaust gas is led out from the exhaust Malebold 3. A part of this exhaust gas flows through the reflux pipes 5a + 5b.
+ 5 c + is fed into the first Zykron dust collection drum 7 via the mini filters 6a and 6b. Carbon substances contained in the exhaust gas are removed by mini filters 6a and 6b. The carbon substances attached to the ceramic materials in the mini-filters 6a, ab are incinerated by using, for example, a claw plug or the like.

Meanwhile, the high voltage generator 8 operates, and the high voltage insulating cable 7
A high voltage is applied to the discharge 1j 7 c via 1. As a result, a corona discharge phenomenon is produced, and exhaust particles of several microns in size, ie, particulates, contained in the fed exhaust gas are captured and removed. Dust collection section 7
f can collect extremely fine particles of particulates.

The reflux pipes 5a, 5b, and 5c are constructed of, for example, finned conduits, have a cooling effect, and can cool the exhaust gas flowing therethrough.

The exhaust gas is sent to the exhaust gas introduction pipe 11 via the Cottrell pipe 7b and the reflux cooling pipe 10.

Furthermore, the purified exhaust gas is sent to the intake gas hold 2.

On the other hand, the high voltage generator 13 is activated and high voltage is applied to the ion generator 12 via the high voltage electric wire 2f. Then,
Exhaust gas is ionized by the ion needles 12a, 12a, compressed within the cylinder, exploded by the injected fuel, and converted into output energy.

The ionized exhaust gas mixture improves the combustion efficiency of the engine, but CO2 in the recirculated exhaust gas suppresses the generation of Now, and it is possible to sufficiently control the exhaust gas other than nitrogen oxides. be.

The above explanation is about the action for recirculating the exhaust gas, but next, the action for releasing the exhaust gas into the atmosphere will be explained.

A part of the exhaust gas is conducted from the exhaust gusset holder 3 to the exhaust pipe 4, and sent to the filter 15 via the strainer screen 15e. Inside the filter 15 is a heat-resistant ceramic material 15a.
When the exhaust gas flows through the exhaust gas, particulates such as carbon substances contained in the exhaust gas are filtered and removed. Particulates 1. accumulated in the filter 15 significantly obstruct the flow of exhaust gas, so if a predetermined amount of particles accumulate, fuel is poured into the filter 15 through the fuel injection pipe 15c, and then the energized wire 15d is
A voltage is applied to the claw plate 15b through the ignition plate 15b to incinerate the particulates whose main component is carbon.

Experiments have shown that if the temperature of the filter 15 is raised to 00°C, the carphone will be completely incinerated and destroyed.

However, when the exhaust gas flows through the filter 15, the filled ceramic material acts as a gas flow blocking resistance and can generate so-called back pressure. This back pressure can suppress the exhaust gas flowing from the exhaust pipe 4 and enhance the function of recirculating a part of the exhaust gas discharged from the exhaust machine pole I part 3.

As a result, the inflow amount of recirculated exhaust gas is increased, and it is possible to improve the combustion efficiency and increase the output of the engine.

According to the results of the experiment, the generation of hack pressure in the filter 15 causes an increase in the amount of recirculated exhaust gas flowing in, creating the same conditions as when the throttle valve is opened, and there is no decrease in the output of the engine. Of course, it turns out that the output increases by 2.

The exhaust gas that has passed through the filter 15 is sent to the exhaust pipe 18 via the second Zykron dust collection drum 17, and is discharged into the atmosphere.

The exhaust gas recirculation device according to the present invention, which is equipped with a filter in the exhaust gas discharge path, has the following advantages because it has the following features.

In other words, a filter filled with a ceramic material is provided in the exhaust gas exhaust path, and the back pressure generated when exhaust gas flows through the filter is effectively utilized, and the back pressure is used to reduce the amount of recirculated exhaust gas. By increasing the amount of inflow, it is possible to improve the combustion efficiency of the engine and increase the output of the engine.

In addition, it can be achieved by simply adding the technical configuration to the conventional E(, R system), and has various effects such as an extremely simple configuration and excellent mass productivity.'・

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of an exhaust gas recirculation device equipped with a filter in the exhaust gas discharge path according to the present invention;
FIG. 2 is a partially sectional perspective view showing an embodiment of the first Zylon dust collection cylinder used in the device according to the present invention, and FIG. 3 is an intake cylinder used in the device according to the present invention; FIG. 4 is a perspective view showing an example of a filter used in the apparatus according to the present invention. 1...Engine body, 2...Intake cylinder; Bold, 3...Exhaust machine body 4.16.18
...Exhaust pipe, 5a, 5b, 5c...Curved return pipe,
7... First cyclone dust collection drum, 15... Curved filter. 15a...Ceramic material, 17...Second
Zyclone dust collection cylinder. Patent Applicant: Naga Suzuki Interest Proceedings Amendment 1982 8J] 21.1 1. Indication of the case, f7 Yume ρ/D/Patent application filed on June 8, 1980 (2) 2 , Name of the invention: Exhaust power recirculation device 3 equipped with a filter in the exhaust gas discharge path, Relationship with the case for amendment Patent applicant 5, Principle of amendment Contents of amendment-9 Specification, page 7 Connected to the 2nd line [Ki...]. If the ion generator 12, ] 2 is replaced with a laser likelihood generator, the same purpose can be achieved more effectively. Add -1. 2. Page 8, line 19 of the specification [...will be incinerated. " followed by [Also, it is conceivable to use a laser beam for the incineration process. Add 1. Tama: In the 20th line of page 10 of the specification, after "...will be incinerated.", add the following line: "In addition, if a laser beam is used for the incineration process, the incineration process can be carried out more effectively." More-1-

Claims (1)

[Claims] In order to recirculate a part of the exhaust gas from the exhaust gas, an exhaust gas recirculation path is constructed of a recirculation pipe, a first Zylon dust collection cylinder, and an intake muffle; An exhaust gas recirculation device equipped with a filter in an exhaust gas exhaust path, characterized in that a filter filled with a porous material is disposed to generate back pressure. (2) An exhaust gas recirculation device equipped with a filter in an exhaust gas discharge path according to claim 1, wherein the filter is filled with a granular ceramic material.