JPH06212943A - Exhaust emission control device for engine - Google Patents

Abstract

(57) [Summary] [Structure] The exhaust gas purification device was configured as follows. That is, the swirl guide part 5 is provided at the exhaust gas inlet 4 on the flow path side of the purification filter 3, and the exhaust swirl chamber 7 surrounded by the porous cylindrical plate 6 is provided between the swirl guide part 5 and the purification filter 3. A particulate trap chamber 8 is provided around the exhaust swirl chamber 7. [Effect] In the swirling exhaust gas 9, the particulate matter having a larger specific gravity than the gas component is pushed out due to the centrifugal force difference, and enters the particulate trap chamber 8 from the hole 10 of the porous cylindrical plate 6 as indicated by an arrow 11. Invaded and captured. In this way, since the particulates in the exhaust gas 9 are removed in advance before reaching the purification filter 3, clogging of the purification filter 3 is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine exhaust gas purification device, and more particularly to a device capable of reducing clogging of a purification filter.

[0002]

2. Description of the Related Art As a conventional technology of an engine exhaust gas purification apparatus, there is one shown in FIG. Like the present invention, it has the following basic structure. That is, the exhaust gas purifier 102 is provided in the exhaust path 101 of the engine, and the exhaust gas purifier 102 houses the purification filter 103. The purification filter 103 is a ceramic filter having a honeycomb structure, and has a plurality of exhaust passages 11 inside.
8, the lower end portion 119 and the upper end portion 120 are alternately closed, and when the exhaust gas 109 passes through the porous partition wall 121 between the adjacent exhaust flow paths 118, the porous partition wall 12
The surface of 1 captures particulates in the exhaust gas to purify the exhaust gas.

By the way, in this way, the purification filter 103
In the exhaust gas purification device having a structure for trapping particulates with the purifying filter 10 by the trapped particulates.
3 may become clogged and become unusable in a short period of time. However, in this conventional technique, the purification filter 103
It does not have any means to reduce the clogging.

In order to reduce the clogging of the purification filter 103, a heating wire is provided around the purification filter 103,
It is conceivable to heat the purification wire 103 to heat the purification filter 103 to incinerate the particulates at the time of clogging, but in this case, the purification filter 103 may be damaged by heating. For example, when the purification filter 103 is the ceramic filter described above, cracks are generated by heating.

[0005]

In the above-mentioned conventional technique, the purification filter 103 is not provided with means for reducing the clogging of the purification filter 103, even though the purification filter 103 is clogged in a short period of time.
03 has a short life. An object of the present invention is to provide an engine exhaust gas purification device that can reduce clogging of a purification filter.

[0006]

As shown in FIG. 1, the present invention is constituted by providing an exhaust gas purifier 2 in an exhaust path 1 of an engine and accommodating a purification filter 3 in the exhaust gas purifier 2. The engine exhaust emission control device is characterized by the following.

That is, a swirl guide portion 5 is provided at the exhaust gas inlet 4 on the flow path side of the purification filter 3, and an exhaust gas swirl surrounded by a perforated cylindrical plate 6 is provided between the swirl guide portion 5 and the purification filter 3. A chamber 7 is provided, and a particulate trap chamber 8 is provided around the exhaust swirl chamber 7, and the particulates in the exhaust gas 9 swirling in the exhaust swirl chamber 7 are centrifugally generated by a perforated cylindrical plate 6
It is characterized in that it is configured so as to enter the particulate capture chamber 8 through the hole 10 and be captured.

[0008]

As illustrated in FIG. 1, the exhaust gas 9 introduced from the exhaust gas introduction port 4 of the exhaust gas purifier 2 becomes a swirl flow in the swirl guide portion 5 and swirls in the exhaust gas swirl chamber 7. In the swirling exhaust gas 9, the particulate matter having a larger specific gravity than the gas component is pushed out by the centrifugal force difference and enters the particulate trap chamber 8 from the hole 10 of the porous cylindrical plate 6 as indicated by an arrow 11. To be captured. In this way, since the particulates in the exhaust gas 9 are removed in advance before reaching the purification filter 3, clogging of the purification filter 3 is reduced.

[0009]

EFFECTS OF THE INVENTION Since particulates in exhaust gas are removed in advance before reaching the purification filter, clogging of the purification filter is reduced. Therefore, the life of the purification filter is extended.

Since the purification filter is not heated, the purification filter is not damaged by heating.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining an engine exhaust gas purification apparatus according to an embodiment of the present invention. FIG.
FIG. 1B is a sectional view taken along line BB of FIG. FIG. 2 is a partial vertical cross-sectional view of an engine equipped with the exhaust emission control device of FIG.

The structure of this exhaust gas purification device is as follows. As shown in FIG. 2, an exhaust manifold 1 of a vertical diesel engine is connected to a particulate trap 13, an exhaust purifier 2, a connecting pipe 14, and an exhaust muffler 15 in order to form an exhaust path 1. As shown in FIG. 1 (A), the exhaust gas purifier 2 contains a purification filter 3.
The purification filter 3 is a ceramic filter having a honeycomb structure, and has a plurality of exhaust passages 18 inside, and the lower end 1
9 and the upper end portion 20 are alternately closed, and when the exhaust gas 9 passes through the porous partition wall 21 between the adjacent exhaust flow paths 18, the surface of the porous partition wall 21 captures particulates in the exhaust gas, It is designed to purify exhaust gas.

The particulate trap 13 is provided to reduce the clogging of the purifying filter 3 due to particulates, and is provided on the upstream side of the exhaust purifier 2 in the flow path. A swirl guide portion 5 is provided at the exhaust introduction port 4. As shown in FIG. 1B, the swirl guide portion 5 is configured by cutting and raising a swirl guide blade 23 from a disc 22 that crosses the exhaust gas introduction port 4. As shown in FIG. 1 (A),
An exhaust gas swirl chamber 7 surrounded by a perforated cylindrical plate 6 is provided between the swirl guide portion 5 and the purification filter 3. Perforated cylindrical plate 6
Is made of punched metal.

A particulate trap chamber 8 is provided around the exhaust swirl chamber 7, and the particulates in the exhaust gas 9 swirling in the exhaust swirl chamber 7 are transferred from the holes 10 of the porous cylindrical plate 6 to the particulate trap chamber 8 by centrifugal force. It is designed to invade and be captured. Particulate discharge pipe 24 equipped with a cock 25 from the bottom of the particulate capture chamber 8
The particulate matter collected in the particulate capture chamber 8 is discharged from here as needed.

Although the contents of the embodiment of the present invention are as described above, the present invention is not limited to this embodiment. For example, in the above-described embodiment, the purification filter 3 is a ceramic filter having a honeycomb structure, but instead of this, another filter such as a filter having a mesh structure may be used. Also,
Although the exhaust gas purifier 2 and the particulate trap 13 are formed as separate bodies, they may be integrally formed.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an exhaust emission control device for an engine according to an embodiment of the present invention, FIG.
FIG. 1B is a sectional view taken along line BB of FIG.

FIG. 2 is a partial vertical cross-sectional view of an engine including the exhaust emission control device of FIG.

FIG. 3 is a vertical cross-sectional view of an engine exhaust emission control device according to a conventional technique.

[Explanation of symbols]

1 ... Exhaust path, 2 ... Exhaust gas purifier, 3 ... Purification filter, 4
... Exhaust gas inlet, 5 ... Swirl guide, 6 ... Perforated cylindrical plate, 7 ...
Exhaust swirl chamber, 8 ... Particulate capture chamber, 9 ... Exhaust, 10 ... 6 holes.

Claims (1)

[Claims] 1. An exhaust gas purifier in an exhaust path (1) of an engine
(2) is provided, and the exhaust gas purifier (2) contains the purification filter (3). In the exhaust purification device of the engine, the exhaust gas inlet (4 ) Is provided with a swirl guide part (5), and an exhaust swirl chamber surrounded by a perforated cylindrical plate (6) between the swirl guide part (5) and the purification filter (3).
(7) is provided, and the particulate capture chamber (8) is provided around the exhaust swirl chamber (7), and the particulates in the exhaust (9) swirling in the exhaust swirl chamber (7) are centrifugal force to generate a perforated cylindrical plate.
An exhaust emission purifying device for an engine, characterized in that it is configured so as to enter the particulate capture chamber (8) through the hole (10) of (6) and be captured.