JPS6062618A - Burnt exhaust gas purifying and silencing equipment - Google Patents

Abstract

PURPOSE:To simplify the construction of an exhaust pipe system by placing porous filter sections and muffler sections in a storage casing. CONSTITUTION:A porous filter section A is formed by both a hollow cylindrical filter element 10 made of a porous material and a cylindrical filter element 11 with a small size in diameter, which has been formed into a pillar made of a porous material as well. A series of muffler sections B are formed between a storage casing 13 and the porous filter section A and between the said filter sections. Fine grains in an exhaust gas flow 4 are caught by those elements 10 and 11 while they pass through the elements 10 and 11, which are placed one after the other, and the exhaust gas is discharged after the flow 4 has been turned in a purified exhaust gas flow 4a. An energy level of noise by the discharge gas flow 4 is lowered at the muffler sections B while the flow 4 passes through the porous filter elements.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention comprises two porous filter parts for capturing unburned particulates in combustion exhaust gas from, for example, a diesel engine, and a casing for storing the filter part, and a muffler is installed inside the porous filter part. [Prior art] In diesel engines, etc., fine particles such as carbon generated during combustion are emitted into the atmosphere. In order to prevent this from occurring, a porous filter is provided in the engine exhaust system to trap these substances to purify the exhaust gas.

Steel wool, sintered metal, cefmic powder, etc. are used as the material for this filter part.

In order to prevent a decrease in output due to clogging of the filter section, a filter regenerator is provided to burn off particulates accumulated in the filter section.

Figure 1 shows the conventional device mentioned above, and Figure 2 shows (
1) is the engine that emits exhaust gas, (2) is its exhaust manifold, (3) is the exhaust pipe, and (4) is the combustion exhaust gas flow.

(4a) is the exhaust gas flow after purification, (5) is the filter regenerator which is multi-branched from the exhaust pipe (3), (6) is the high temperature air flow supplied from this regenerator, and (7) is the porous filter. Part, (
8) is part of the muffler.

In the above configuration, the exhaust gas flow (
4) Fine particles such as carbon contained therein are captured by the porous filter section (7) and purified exhaust gas stream (4a)
and is guided to the muffler part (8). The particulates deposited on the filter section are removed from the filter regenerator (5).
) is burnt and removed by a hot air stream (6) supplied from ).

The above-mentioned devices are mounted under the vehicle floor due to problems such as engine room space.

Also the space under the floor. Due to restrictions due to vehicle height,
Another drawback is that the filter section cannot have a sufficient trapping volume, which necessitates shortening the filter regeneration interval and reduces regeneration efficiency.

[Summary of the invention]

This invention simplifies the structure of the exhaust pipe system by providing the porous filter itself with a muffler function (by providing the muffler function in the storage casing). The aim is to obtain an exhaust gas purification and silencing device.

[Embodiments of the invention]

Examples of the present invention will be described below. That is,
In Fig. 2, the same parts as those in Fig. 1 are indicated by the same reference numerals, and (9) in Fig. 2 is the purification and silencing device of the present invention.)
, FIG. 3 is a partially enlarged cross-sectional view showing one embodiment of the filter element. with a filter element.

These constitute the so-called interior porous filter section (A). (1 is a support plate for the cylindrical filter element (+1), αj is a storage casing in which these are housed at predetermined intervals, and between the casing and the porous filter part,
A series of muffler parts (B) are formed between these filter parts.

In the above configuration, the exhaust gas flow (
4) When the fine particles inside are passed through the alternately arranged elements Qlaυ, they are captured by these elements and exit as a purified exhaust gas stream (4a). Further, the sound energy due to the exhaust gas flow (4) is attenuated when passing through each porous filter element, and is also attenuated by the expansion and contraction action of the muffler part (B) within the casing aJ.

In addition, FIG. 4 shows another embodiment of FIG. 3.
In the figure (14a) are several exhaust gas passage holes (14c)
A cylindrical filter element made of a porous material attached with (1
4b) is a cylindrical filter element having the same diameter and made of the same material, but several exhaust gas passage holes (14a) are provided so as to be non-coaxial with the exhaust gas passage (i4c) provided in the filter element (14a). ) is unique in that it has been established.

In each of the above embodiments, the exhaust gas flow is made to flow along the axis of the porous filter section, but the exhaust gas flow may be made to flow perpendicularly to the outer peripheral surface of the porous filter section. Fig. 5 shows another embodiment employing this orthogonal method. Small diameter filter element, (16a) is an annular partition plate in the casing having an exhaust gas passage hole in the center smaller than the inner diameter of each of these small diameter filter elements α field, (1
6b) is a multi-disk-shaped partition plate with a plurality of through holes (16c) for exhaust gas passages formed on its outer peripheral edge that protrudes from the outer peripheral surface of the small-diameter filter element, and when installed, each small-diameter filter element U5 is It is provided within the casing 0 so as to be divided.

Therefore, in this embodiment, the exhaust gas flow (4) passes through the peripheral wall of the first partition plate (16a) through the axial hole of the small-diameter filter element α, as shown by the arrow in the figure, and passes through the secondary partition plate (16a). Through the exit hole (16c) of the plate (16b), it enters the peripheral wall of the first-order small-diameter filter element a [with], passes through its axial hole, and exits from the peripheral wall of the next small-diameter filter element a. It flows in a meandering pattern, and at that time, the sound is muffled by a part of the muffler (B) between each partition υ plate.

Furthermore, FIG. 6 shows another embodiment of the present invention.
In the figure, (17) is a single porous cylindrical filter element provided on the upstream side of the exhaust gas flow, which constitutes the first half of the filter section. The filter element Q is a multi-stage expansion type 77 plate installed on the downstream side. ), and the exhaust sound is attenuated by these elements α and the muffler plate (II).

In each of the above embodiments, the case where the cross-sectional shape of the porous filter part is circular has been described, but the cross-sectional shape is not limited to this, and the cross-sectional shape may be an ellipse or the like, and two objects of the present invention are It is not specified for exhaust gas purification and noise reduction in diesel engines.

〔Effect of the invention〕

As explained above, in this invention, since the filter part and part of the muffler are constructed in the same casing, the structure of the exhaust pipe system can be simplified.

A small-sized purification and silencing device suitable for mounting under the floor of a vehicle can be obtained.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the state of use of a conventional combustion exhaust gas purification and silencing device, Fig. 2 is a diagram showing an embodiment of the combustion exhaust gas purification and silencing device of the present invention, and Fig. 3 is an explanatory diagram showing how the conventional combustion exhaust gas purification and silencing device is used. FIGS. 4 to 6 are partially enlarged sectional views showing other embodiments of the purifying and silencing device of the present invention. FIGS. In Figure 1, (A) is a porous filter part, (B) is a part of a muffler, (IQ is a hollow cylindrical filter element, aυ is a cylindrical filter element, α3 is a storage casing, (14a) and (14b) are Exhaust gas passage hole (14
c) (14d) is a cylindrical filter element, α9 is a hollow cylindrical small diameter filter element 2 (16a) is an annular partition plate, and (16b) is a disc-shaped partition p plate. In the drawings, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa (and 2 others) Figure 3 Figure 4 Figure 5 Figure 6

Claims (6)

[Claims] (1) A combustion exhaust gas purification and muffling device characterized in that a porous filter section for capturing unburned particulates in an exhaust gas flow and a muffler section are constructed within a housing casing. (2) Between the storage casing and the porous filter sections arranged in parallel therein, and between these filter sections K. A combustion exhaust gas purification and silencing device according to claim (1), which constitutes a part of a series of mufflers. (3) Purification and muffling of combustion exhaust gas according to claim (1), wherein the porous filter section is composed of a hollow cylindrical filter element and a cylindrical filter element, and these are arranged alternately in the housing casing. Device. (4) In the storage casing, the exhaust gas passage holes of the plurality of porous filter sections arranged in parallel in front and behind with respect to the exhaust flow passing through the core section are arranged so as to be non-coaxial with each other. The combustion exhaust gas purification and silencing device described in (2). (5) The porous filter section arranged concentrically within the storage casing is composed of a plurality of small-diameter hollow cylindrical filter elements, and these are separated by a disk-shaped partition plate having through-holes only on the outer periphery, and a disk-shaped partition plate having through holes only on the outer periphery. An annular partition plate with or without holes is divided within the casing, and is connected to the axial center hole of each filter element separated between the casing and each partition plate through its peripheral wall. A combustion exhaust gas purification and silencing device according to claim (1), which forms a part of a series of mufflers that communicate with each other. (6) Combustion exhaust gas purification and purification as described in claim (1), wherein a porous filter section is provided on the upstream side of the exhaust flow passing through the core section in the housing cushioning, and a muffler plate is disposed immediately after the porous filter section. Silencer.