KR101316878B1 - Exhaust gas filter - Google Patents

Abstract

The present invention relates to an exhaust gas filtering device, which is mounted in the outer case through an outer case connected to an exhaust pipe, a front flange and a rear flange, and an exhaust inlet passage through which exhaust gas flows is formed therein, and A filtering unit forming an exhaust outlet passage so that the purified exhaust gas is discharged; A pressure relief flange provided inside the front flange and forming a pressure relief path therein for communicating the exhaust inflow passage and the exhaust outlet passage; A pressure relief metal foam provided in the pressure relief path; And a support provided in the radial direction of the pressure relief pass to support the pressure relief metal foam.

Description

Exhaust gas filtration device {EXHAUST GAS FILTER}

The present invention relates to an exhaust gas filtering device, and more particularly, when the particulate matter trapped in the exhaust gas filtering device increases and the pressure in the exhaust gas filtering device increases excessively, the exhaust gas is bypassed to exhaust the exhaust gas filtering device. The present invention relates to an exhaust gas filtration device capable of preventing breakage.

Exhaust gases emitted by combustion of internal combustion engines contain various harmful components such as carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx), particulate matter (PM), and carbon dioxide (CO2). Devices or methods have been devised for removal.

Particularly, in diesel engine vehicles, particulate matter may be formed using an exhaust gas filtration device or a post-treatment device such as a diesel particulate filter (DPF) or a diesel oxidation catalyst (DOC). It is removing the back.

6 is a schematic view showing a general exhaust gas filtration device. As shown in FIG. 6, the exhaust gas is filtered while passing through the filter body 20 surrounding the outer circumferential surface of the porous tube 10. The filtered exhaust gas is discharged to the outside through the exhaust gas passage 30.

However, if the exhaust gas filtration device is used for a long time, excessive collection of particulate matter or the like may cause an increase in pressure in the filtration device, resulting in damage to the filtration device or reduction of engine performance.

According to the present invention, when the particulate matter trapped in the exhaust gas filtration device increases and the pressure in the exhaust gas filtration device is excessively increased, the exhaust gas is bypassed to prevent breakage of the exhaust gas filtering device, and It is to provide an exhaust gas filtration device that can be purified.

Exhaust gas filtration device according to an embodiment of the present invention includes an outer case connected to the exhaust pipe; A filtering unit mounted in the outer case through a front flange and a rear flange, an exhaust inlet passage through which exhaust gas flows, and an exhaust outlet passage through which the outer case and purified exhaust gas are discharged unit); A pressure relief flange provided inside the front flange and forming a pressure relief path therein for communicating the exhaust inflow passage and the exhaust outlet passage; A pressure relief metal foam provided in the pressure relief path; And a support provided in the radial direction of the pressure relief pass to support the pressure relief metal foam.

The pressure relief metal foam may have a stepped portion formed at one end thereof in the radial direction, the support may contact the stepped portion, and the pressure relief metal foam may be separated.

The pressure relief flange may be formed of two plates so that the pressure relief pass may be formed between the plates.

The pressure relief metal foam may have an average diameter of pores of 800 to 1200 µm.

The filtration unit is a porous tube provided along the longitudinal direction of the outer case; And a filter body provided in an outer circumferential direction of the porous tube.

The filter body may be a plurality of plates, and may be a cylindrical filter arranged side by side in the longitudinal direction of the porous tube.

The filter medium may be a rolled filter such that a plurality of layers are formed around the porous tube.

The exhaust gas filtering device may further include a jacket provided to surround the filter body.

The filter medium is a diesel particulate filter (DPF), diesel oxidation catalyst (DOC), nitrogen oxide removal device (Selective Catalytic Reduction: SCR, Lean NOx Trap: LNT), three-way catalyst ( At least one selected from the group including Three Way Catalyst).

According to the exhaust gas filtering device according to the embodiment of the present invention, even if the particulate matter trapped in the exhaust gas filtering device increases and the pressure in the exhaust gas filtering device is excessively increased, the exhaust gas is bypassed and the exhaust gas filtering device is damaged. Can be prevented, and the exhaust gas to be bypassed can be partially filtered. In addition, damage to engine parts (EGR, turbocharger, etc.) and output reduction can be prevented.

1 is a cross-sectional view of an exhaust gas filtration device according to an embodiment of the present invention.
2 is a partial perspective view of an exhaust gas filtration device according to an embodiment of the present invention.
3 and 4 are partial perspective views of the pressure relief flange of the exhaust gas filtering device according to the embodiment of the present invention.
Figure 5 is a perspective view showing the configuration of the filtration unit of the exhaust gas filtration device according to an embodiment of the present invention.
6 is a cross-sectional view showing a general exhaust gas filtration device.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of an exhaust gas filtering device according to an embodiment of the present invention, Figure 2 is a partial perspective view of the exhaust gas filtering device according to an embodiment of the present invention.

3 and 4 are partial perspective views of the pressure relief flange of the exhaust gas filtration device according to the embodiment of the present invention, and FIG. 5 is a perspective view showing the configuration of the filtration unit of the exhaust gas filtration device according to the embodiment of the present invention. .

1 to 5, the configuration of the exhaust gas filtration apparatus according to the embodiment of the present invention will be described.

Exhaust gas filtration device 100 according to an embodiment of the present invention, is mounted in the outer case 120 through the outer case 120, the front flange 150 and the rear flange 155 connected to the exhaust pipe 110, And an exhaust inlet passage 147 through which exhaust gas is introduced, and a filtering unit configured to form an exhaust outlet passage 148 through which the outer case 120 and the purified exhaust gas are discharged. A pressure relief flange 130 provided inside the front flange 150 and forming a pressure relief path 131 communicating therewith between the exhaust inlet passage 147 and the exhaust outlet passage 148, and the pressure relief The pressure relief metal foam 132 provided in the path 131 and the support 136 provided in the radial direction of the pressure relief path 131 to support the pressure relief metal foam 132.

The filtration unit includes a porous tube 135 provided along the longitudinal direction of the outer case 120 and a filter body 140 provided in an outer circumferential direction of the porous tube 135, and the filter body 140. Jacket 160 may be provided to surround.

A passage supporting part 157 protrudes from the rear flange 155 to form the outer case 120 and the exhaust gas passage 156.

The porous tube 135 and the jacket 160 support the filter body 140, and a plurality of holes are formed to allow the exhaust gas to smoothly flow into the filter body 140, and a material resistant to thermal shock. Is formed.

A sealing mat (not shown) may be provided between the front and rear flanges 150 and 155 and the filter body 140 to prevent exhaust gas leakage.

As shown in (a) of FIG. 5, the filter body 140 is a plurality of plates, and a cylindrical filter 142 disposed side by side in the longitudinal direction of the porous tube 135. Can be.

Referring to FIG. 5B, the filter body 140 may include rolled filters 144 and 146 such that a plurality of layers are formed around the porous tube 135.

The filter body 140 may be made of SiC, Cordierite, AT, SiN, etc., which are ceramic materials, or may be made of a metal Foil type, foam type, wire mesh type, metal fiber, or the like.

The filter body 140 is a diesel particulate filter (DPF), diesel oxidation catalyst (DOC), nitrogen oxide removal device (Selective Catalytic Reduction: SCR, Lean NOx Trap: LNT), It may be made of at least one selected from the group comprising a three way catalyst.

That is, the filter body 140 is laminated with different types of filters in order, such as carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx), particulate matter (PM), carbon dioxide (CO2) and the like contained in the exhaust gas. Hazardous components can also be filtered at the same time, which saves space, improves filtration efficiency, and reduces production costs than installing DPF, DOC, or three-way catalysts separately.

The pressure relief flange 130 is provided between the front flange 150 and the filter body 140.

In addition, the pressure relief flange 130, as shown in Figure 2, may be formed of two plates (130a, 130b), the pressure relief path 131 may be formed between the plates (130a, 130b). 3 and 4, the front flange 150, the single plate 130b, and the pressure relief flange 130 may be formed.

The pressure relief metal foam 132 has a stepped portion 133 formed at one end thereof in the radial direction, and the support 136 is in contact with the stepped portion 133, and the pressure relief metal foam 132 is separated. Protruding portion 137 is formed.

The support 136 fixes the position of the pressure relief metal foam 132 in the process of coupling the pressure relief flange 130, and prevents the pressure relief metal foam 132 from being excessively compressed. In addition, the support 136 is provided in the radial direction of the pressure relief path 131 to prevent the flow of exhaust gas is disturbed.

The pressure relief metal form 132 is a porous metal foam having an average diameter of pores of 800 to 1200 μm, and when the filter body 140 operates normally, soluble organic matter of exhaust gas is dissolved. Organic Fraction (SOF) to filter, and when the particulate matter (PM) is deposited due to long-term use of the filter body 140, the filter body 140 is clogged to serve as a passage for discharging the exhaust gas. By doing so, the filter body 140 may be prevented from being damaged. That is, the pore average diameter of the porous metal foam is 800 to 1200 μm to maintain the flow of fine exhaust gas under normal circumstances, and to filter out SOF and the like, and to exhaust the exhaust gas when the filter body 140 is clogged. It was possible to discharge.

Referring back to Figure 1 will be described the operating principle of the exhaust gas filtering device according to an embodiment of the present invention.

In a normal operating state, exhaust gas is discharged through the exhaust pipe 110, the exhaust inflow passage 147, the filter body 140, the exhaust outlet passage 148, and the exhaust gas passage 156. Only a small amount of exhaust gas passes through the pressure relief pass 131, and soluble organic matter is filtered through the pressure relief metal foam 132 provided in the pressure relief pass 131.

However, when the particulate matter PM or the like is excessively accumulated in the filter body 140, the pressure in the exhaust gas filtering device 100 is greatly increased. In this case, some of the exhaust gas does not flow into the filter body 140. Exhaust gas that does not flow into the filter body 140 flows out of the exhaust gas filtering device 100 through the pressure relief metal foam 132 provided in the pressure relief path 131.

As described above, the exhaust gas filtering device 100 according to the embodiment of the present invention bypasses the exhaust gas when the particulate matter PM or the like is accumulated excessively and the pressure in the exhaust gas filtering device 100 is excessively increased. Damage to the exhaust gas filtering device 100 can be prevented.

According to the exhaust gas filtering device according to the embodiment of the present invention, while effectively removing various harmful components of the exhaust gas discharged from the internal combustion engine used in vehicles, ships, etc., particulate matter trapped in the exhaust gas filtering device increases to exhaust gas Even if the pressure in the filtration device increases excessively, it is possible to bypass the exhaust gas to prevent damage to the exhaust gas filtration device.

In addition, the exhaust gas is bypassed and at the same time, the exhaust gas can be partially filtered and damage to engine parts (EGR, turbocharger, etc.) and damage to the output can be prevented.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

110: exhaust pipe 120: outer case
130: pressure relief flange 130a, 130b: plate
131: pressure relief pass 132: pressure relief metal foam
133: step 135: porous tube
136: support 137: protrusion
140: filter medium 147: exhaust inlet passage
148: exhaust outlet passage 150: front flange
155: rear flange 156: exhaust gas passage
157: passage support 160: jacket

Claims (9)

An outer case connected to the exhaust pipe;
A filtering unit mounted in the outer case through a front flange and a rear flange, an exhaust inlet passage through which exhaust gas flows, and an exhaust outlet passage through which the outer case and purified exhaust gas are discharged unit);
A pressure relief flange provided inside the front flange and forming a pressure relief path therein for communicating the exhaust inflow passage and the exhaust outlet passage;
A pressure relief metal foam provided in the pressure relief path; And
A support provided in the radial direction of the pressure relief pass to support the pressure relief metal foam;
Exhaust gas filtration device comprising a. In claim 1,
The pressure relief metal foam has a stepped portion formed at one end thereof in the radial direction,
The support body is in contact with the stepped portion, characterized in that the exhaust gas filtering device characterized in that the protrusion formed to prevent the pressure relief metal foam from being separated. 3. The method of claim 2,
The pressure relief flange is formed of two plates, wherein the pressure relief pass is formed between the plates. 3. The method of claim 2,
The pressure relief metal foam is an exhaust gas filtration device, characterized in that the average diameter of the pores of 800 to 1200㎛. The method according to any one of claims 1 to 4,
The filtration unit,
A porous tube provided along a length direction of the outer case; And
A filter body provided in an outer circumferential direction of the porous tube;
Exhaust gas filtration device comprising a. The method of claim 5,
The filter body is a plurality of plates (plate), exhaust gas filtration device, characterized in that the cylindrical filter arranged side by side along the longitudinal direction of the porous tube. The method of claim 5,
And said filter medium is a rolled filter so that a plurality of layers are formed around said porous tube. The method of claim 5,
The exhaust gas filtering device
A jacket provided to surround the filter medium;
Exhaust gas filtration device further comprising. The method of claim 5,
The filter medium is a diesel particulate filter (DPF), diesel oxidation catalyst (DOC), nitrogen oxide removal device (Selective Catalytic Reduction: SCR, Lean NOx Trap: LNT), three-way catalyst ( Exhaust gas filtration device comprising at least one selected from the group comprising Three Way Catalyst.

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