KR101035995B1 - Exhaust gas filtering device - Google Patents

Abstract

The present invention relates to an exhaust gas filtering device, comprising: an outer case connected to an exhaust pipe, a filtering unit provided in the case for filtering exhaust gas, a filtering path for supplying exhaust gas to the filtering part, and exhaust gas. And a switching device provided in the outer case such that a bypass formed in the outer case and exhaust gas are selectively introduced into the filtration path and the bypass so that gas is discharged by bypassing the filtration unit. When the particulate matter collected in the apparatus increases and the pressure in the exhaust gas filtration apparatus is excessively increased, exhaust gas is bypassed and the breakage of the exhaust gas filtration apparatus can be prevented. In addition, damage to engine parts (EGR, turbocharger, etc.) and output reduction can be prevented.

Exhaust Gas, Filters, Mufflers

Description

Exhaust gas filtration device {EXHAUST GAS FILTERING DEVICE}

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 nitrogen oxides (NOx), carbon dioxide, and ash, and apparatuses and methods for removing these harmful components have been devised.

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.

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.

Accordingly, the present invention was created to solve the above problems, and an object of the present invention is to exhaust the particulate matter trapped in the exhaust gas filtration device, so that the pressure in the exhaust gas filtration device increases excessively. It is to provide an exhaust gas filtration device that can bypass the gas discharge to prevent damage of the exhaust gas filtration device.

Exhaust gas filtration device according to a first embodiment of the present invention for achieving this object is provided in the outer case connected to the exhaust pipe, a filtering unit (filtering unit) for filtering the exhaust gas provided in the case, supply the exhaust gas to the filtering unit A filtering path, a bypass formed in the outer case so that exhaust gas is discharged by bypassing the filtration unit, and an exhaust gas provided in the outer case so as to selectively flow into the filtering path and the bypass. It may include a switching device.

The filtration unit, the porous tube provided along the longitudinal direction of the outer case, the filter body provided in the outer circumferential direction of the porous tube, the first flange provided in the horizontal direction of the porous tube to support the filter body, the It is provided in the transverse direction of the porous tube to support the filter body, and may include a second flange formed with an exhaust gas passage and a jacket surrounding the filter medium and connecting the first flange and the second flange.

The filter body may have a cylindrical shape provided in plurality in the longitudinal direction of the porous tube.

The filter medium may be provided in a plurality of layers around the porous tube.

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 from the group including Three Way Catalyst).

The switching device is provided with a switching unit for connecting the front of the exhaust pipe and the porous tube, the switching unit is provided to selectively open the bypass valve and the bypass valve to block the filtration passage and the bypass. Including an operating unit, the rear of the porous tube is blocked, the first flange may be formed with an exhaust gas passage.

The operating unit may be any one selected from the group consisting of a diaphragm and a solenoid.

The switching unit may be provided with a shutoff valve to selectively block the switching unit.

In the switching device of the exhaust gas filtering device according to the second embodiment of the present invention, a bypass valve provided to block the porous tube, a discharge port is formed, the bypass valve cover and the bypass coupled to the second flange It may include an elastic portion provided between the valve and the bypass valve cover to provide an elastic force to the bypass valve.

In the exhaust gas filtering device according to the third embodiment of the present invention, an exhaust gas passage is formed in the first flange, and the switching device includes a chamber formed between the outer case and the first flange, the chamber and the porous body. It may include a shut-off valve for selectively blocking the tube, a bypass valve for blocking the exhaust gas passage formed in the first flange, an operation unit for selectively opening the bypass valve by using the pressure of the chamber.

The operation part may include an operation part case connected to the chamber, an elastic part provided in the operation part case, and a connector elastically supported by the elastic part and connected to the bypass valve.

In the exhaust gas filtration apparatus according to the third embodiment of the present invention, the filtration unit may include a filter body stacked in the longitudinal direction of the outer case and a third flange provided to support the filter body.

It may further include a jacket provided to support the filter body.

It may include a bypass valve provided on the third flange to selectively open the third flange and an operating unit provided to selectively open the bypass valve.

The actuator can be any one selected from the group comprising a diaphragm or solenoid.

In the exhaust gas filtration apparatus according to the fifth embodiment of the present invention, the operation part includes a bypass valve support part and an elastic part provided between the bypass valve support part and the bypass valve to provide elastic force to the bypass valve. can do.

As described above, 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 increases excessively, the exhaust gas is bypassed and exhausted. Breakage of the filtration device can be prevented. In addition, damage to engine parts (EGR, turbocharger, etc.) and output reduction can be prevented.

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 filtration device according to a first embodiment of the present invention, FIG. 2 is a perspective view showing the configuration of a filter body of the exhaust gas filtration device according to a first embodiment of the present invention, and FIG. Fig. 1 is a perspective view showing the configuration of the filtration unit of the exhaust gas filtration device according to the first embodiment of the present invention.

1 to 3, the configuration of the exhaust gas filtration apparatus according to the first embodiment of the present invention will be described.

Exhaust gas filtration device according to a first embodiment of the present invention is an outer case 120 connected to the exhaust pipe 110, a filtering unit (filtering unit) for filtering the exhaust gas provided in the case 120, the exhaust gas to the filtering unit Filtering path for supplying the bypass, bypass formed in the outer case 120 so that the exhaust gas is discharged bypassing the filtration unit and the exhaust gas is selectively introduced into the filtering path and the bypass It includes a switching device provided in the outer case 120.

The filtration unit is to support the porous tube 130 provided along the longitudinal direction of the outer case 120, the filter body 140 provided in the outer circumferential direction of the porous tube 130, the filter body 140. A first flange 150 provided in the transverse direction of the porous tube 130, a transverse direction of the porous tube 130 to support the filter body 140, and an exhaust gas passage 156 formed therein; 2 includes a flange 155 and a jacket 160 that surrounds the filter body 140 and connects the first flange 150 and the second flange 155.

Here, the rear of the porous tube 130 is closed by the porous tube cover 132, the exhaust gas passage 151 is formed in the first flange 150.

The porous tube 130 and the jacket 160 support the filter body 140, and a plurality of holes are formed to allow the exhaust gas to flow smoothly into the filter body 140, and a material resistant to thermal shock. Is formed.

In the first embodiment of the present invention, the filtration path may be defined in the direction of the arrow passing through the porous tube 130 and the filter body 140 shown in FIG.

In the first embodiment of the present invention, the bypass includes the exhaust gas passage 151 of the first flange 150, the outer case 120, and the jacket of which the arrow shown in FIG. 160 may be defined as the space between.

The switching device is provided in the switching unit 170, the switching unit 170 for connecting the front of the exhaust pipe 110 and the porous tube 130, the bypass valve for blocking the filtration passage and the bypass ( 180) and an operating unit 190 provided to selectively open the bypass valve 180.

The operation unit 190 may be a mechanical diaphragm 192 or an actuator, or may be an electrical solenoid 194.

The switching unit 170 is provided with a shutoff valve 172 to selectively block the switching unit 170.

A sealing mat 158 is provided between the first flange 150, the second flange 155, and the filter body 140 to prevent the exhaust gas from leaking.

As shown in (a) of FIG. 2, the filter body 140 may be a cylindrical filter 142 provided in plurality in the longitudinal direction of the porous tube.

In addition, as shown in FIG. 2B, a plurality of layers of filters 144 and 146 may be provided around the porous tube 130.

The filter medium may be composed of ceramic-based SiC, Cordierite, AT, SiN, or the like, or may be composed of a metal-based 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 include at least one from the group containing the three way catalyst (Three Way Catalyst).

That is, the filter body 140 may be laminated with different types of filters in sequence to simultaneously filter various harmful components such as nitrogen oxides (NOx), carbon dioxide, and ash contained in the exhaust gas. Space can be saved, filtration efficiency can be increased, and production cost can be reduced than if three-way catalyst is installed separately.

1 to 3, the operation of the exhaust gas filtration apparatus according to the first embodiment of the present invention will be described.

Figure 1 (a) is a cross-sectional view showing the general operation of the exhaust gas filtration device according to the first embodiment of the present invention.

In a general operating state, exhaust gas is discharged through the exhaust pipe 110, the switching unit 170, the porous tube 130, the filter body 140, and the exhaust gas passage 156.

Figure 1 (b) is a cross-sectional view showing the operation of the abnormal state of the exhaust gas filtration device according to the first embodiment of the present invention.

The abnormal state is a case where the particulate matter PM or the like is excessively accumulated in the filter body 140 and the pressure in the exhaust gas filtering device is excessively increased.

First, when the pressure in the exhaust gas filtering device is increased to the set warning pressure, the driver is warned by a warning light or a warning alarm.

The warning pressure set here may be set in consideration of the time required for the driver to recognize the pressure rise and to service or replace the filtration device. Will alert you.

After warning the driver at the set warning pressure, if the vehicle continues to operate without maintenance or replacement of the filtration device, the pressure in the exhaust filtration device will be further increased.

The pressure in the exhaust gas filtration device reaches an operating pressure, and the ECU causes the operating unit 190 to operate.

Here, the operating pressure may be set to the maximum pressure that can be prevented from damaging the exhaust gas filtering device.

The operation unit 190 opens the bypass valve 180 connected to the operation unit 190, and exhaust gas is discharged through the bypass valve 180 and the exhaust gas passages 151 and 156. The switching unit 170 may be blocked by the shutoff valve 172 to prevent exhaust gas from flowing into the filtration unit.

As described above, the exhaust gas filtration apparatus according to the first embodiment of the present invention bypasses the exhaust gas when the particulate matter (PM) or the like is excessively accumulated and the pressure in the exhaust gas filtration apparatus is excessively increased. The filtration apparatus can be prevented from being damaged.

4 is a cross-sectional view of an exhaust gas filtration device according to a second embodiment of the present invention.

Hereinafter, the configuration of the exhaust gas filtration apparatus according to the second embodiment of the present invention will be described with reference to FIG.

The configuration of the exhaust gas filtration device according to the second embodiment of the present invention is similar to the configuration of the exhaust gas filtration device according to the first embodiment of the present invention, and the overlapping description of the same configuration is omitted.

Exhaust gas filtration device according to a second embodiment of the present invention is the outer case 420, the porous tube 430, the filter body 440, the first flange 450, the second flange 455, the jacket 460, An exhaust gas passage 456, a sealing mat 458.

In the switching device of the exhaust gas filtration device according to the second embodiment of the present invention, a bypass valve 480 and a discharge port 492 are formed to block the porous tube, and the bypass is coupled with the second flange 455. It includes a pass valve cover 490 and an elastic portion 494 provided between the bypass valve 480 and the bypass valve cover 490 to provide an elastic force to the bypass valve 480.

Referring to the operation of the exhaust gas filtration apparatus according to the second embodiment of the present invention, the exhaust gas in the normal operating state, as shown in Figure 4 (a), the porous tube 430, the filter body ( 440 and is discharged through the exhaust gas passage 456.

When the particulate matter PM is excessively accumulated in the filter body 440 and the pressure in the exhaust gas filtering device is excessively increased, as shown in FIG. 4B, the inside of the porous tube 430 The bypass valve 480 is opened by the pressure of the exhaust gas.

The elastic force of the elastic portion 494 may be set in a range that does not damage the exhaust gas filtering device.

Exhaust gas filtration device according to a second embodiment of the present invention also has a pressure sensor (not shown) to warn the driver of maintenance or replacement, a detailed description of this configuration will be omitted.

5 is a cross-sectional view of an exhaust gas filtration device according to a third embodiment of the present invention.

Hereinafter, the configuration of the exhaust gas filtration apparatus according to the third embodiment of the present invention will be described with reference to FIG.

The configuration of the exhaust gas filtration device according to the third embodiment of the present invention is similar to the configuration of the exhaust gas filtration device according to the first embodiment of the present invention, and the overlapping description of the same configuration is omitted.

Exhaust gas filtration device according to a third embodiment of the present invention is the exhaust pipe 510, the outer case 520, the porous tube 530, the porous tube cover 532, the filter body 540, the first flange 550, A second flange 555, a jacket 560, an exhaust gas passage 556, and a sealing mat 558 are included.

In the exhaust gas filtering device according to the third embodiment of the present invention, an exhaust gas passage 551 is formed in the first flange 550, and the switching device includes the outer case 520 and the first flange 550. A chamber 570 formed therebetween, a shutoff valve 572 selectively blocking the chamber 570 and the porous tube 530, and blocking an exhaust gas passage 551 formed in the first flange 550. Bypass valve 580, the operation portion to selectively open the bypass valve 580 by using the pressure of the chamber 570.

The operation part is elastically supported by an operation part case 592 connected to the chamber 570, an elastic part 594 provided in the operation part case 592, and the elastic part 594, and the bypass valve 580. And a connector 596 connected thereto.

Hereinafter, referring to FIG. 5, the operation of the exhaust gas filtration device according to the third embodiment of the present invention will be described. FIG. 5A illustrates the general operation of the exhaust gas filtration device according to the third embodiment of the present invention. It is sectional drawing.

In a normal operating state, exhaust gas is discharged through the exhaust pipe 510, the chamber 570, the porous tube 530, the filter body 540, and the exhaust gas passage 556.

Figure 5 (b) is a cross-sectional view showing the operation of the abnormal state of the exhaust gas filtration device according to a third embodiment of the present invention.

If the abnormal state, that is, the pressure in the exhaust gas filtering device increases due to the set warning pressure, the driver is warned by a warning light or a warning alarm.

After warning the driver at the set warning pressure, if the vehicle continues to operate without maintenance or replacement of the filtration device, the pressure in the exhaust filtration device will be further increased.

The pressure in the exhaust gas filtration device reaches an operating pressure, and the ECU actuates the shutoff valve 572 to block the inlet of the porous tube 530.

Then, the pressure in the chamber 570 rapidly increases, and the pressure inside the operating part case 592 also increases to compress the elastic part 594 and open the bypass valve 580.

Exhaust gas is then discharged through the chamber 570 and the exhaust gas passages 551 and 556, thereby preventing damage to the exhaust gas filtering device.

In the exemplary embodiment of the present invention, the exhaust gas flows from the inside to the outside in the step of filtering the exhaust gas, that is, only the outward type has been described. However, the inward type may be configured.

That is, it may be configured so that the exhaust gas flows in the opposite direction to the directions shown in FIGS.

6 is a cross-sectional view of an exhaust gas filtration device according to a fourth embodiment of the present invention.

Hereinafter, an exhaust gas filtration device according to a fourth embodiment of the present invention will be described with reference to FIG. 6.

In the configuration of the exhaust gas filtration device according to the fourth embodiment of the present invention, descriptions overlapping with the exhaust gas filtration device according to the first embodiment of the present invention will be omitted.

The exhaust gas filtering device according to the fourth embodiment of the present invention includes an exhaust pipe 610 and an outer case 620.

In the exhaust gas filtration apparatus according to the fourth embodiment of the present invention, the filtration unit is provided to support the filter body 640 and the filter body 640 stacked along the longitudinal direction of the outer case 620. Three flanges 650.

A jacket 660 may be provided to support the filter body 640 to support the filter body 640 to prevent deformation due to heat.

An exhaust gas passage 651 is formed in the third flange 650, and a bypass valve 680 is provided to block the exhaust gas passage 650.

The bypass valve 680 is connected to the operation unit 690, the operation unit 690 selectively opens the bypass valve 680.

The operation unit 690 may be any one selected from the group including a diaphragm or a solenoid, as in the first embodiment of the present invention.

In the fourth embodiment of the present invention, the filtration path may be defined in the direction of the arrow passing through the filter body 640, as shown in FIG.

In the fourth embodiment of the present invention, the bypass includes an exhaust gas passage 651, the outer case 620, and the jacket 660 of the third flange 650 through which the arrow shown in FIG. 6B passes. It can be defined as the space between them.

Referring to the operation of the exhaust gas filtration apparatus according to the fourth embodiment of the present invention, the exhaust gas is discharged through the filter body 640 in a general operating state, as shown in FIG. .

In the exhaust gas filtration apparatus according to the fourth embodiment of the present invention, the exhaust gas introduced into the exhaust pipe 610 passes through the filter body 640 and is filtered out.

6B is a cross-sectional view showing the operation of an abnormal state of the exhaust gas filtration device according to the fourth embodiment of the present invention.

The abnormal state is a case where particulate matter (PM) or the like is excessively accumulated in the filter body 640 and the pressure in the exhaust gas filtration device is excessively increased.

First, when the pressure in the exhaust gas filtering device increases with the set warning pressure, the driver is warned by a warning light or an alarm.

The warning pressure set here may be set in consideration of the time required for the driver to recognize the pressure rise and to service or replace the filtration device. Will alert you.

After warning the driver at the set warning pressure, if the vehicle continues to operate without maintenance or replacement of the filtration device, the pressure in the exhaust filtration device will be further increased.

The pressure in the exhaust gas filtering device reaches the operating pressure, and the ECU causes the operating unit 690 to operate.

The operation unit 690 opens the bypass valve 680 connected to the operation unit 690, and exhaust gas is discharged through the bypass valve 680 and the exhaust gas passage 651 to exhaust the exhaust gas. Damage to the gas filtration device can be prevented.

7 is a cross-sectional view of an exhaust gas filtration device according to a fifth embodiment of the present invention.

Hereinafter, an exhaust gas filtration device according to a fifth embodiment of the present invention will be described with reference to FIG. 7.

In the configuration of the exhaust gas filtration device according to the fifth embodiment of the present invention, a description overlapping with the exhaust gas filtration device according to the fourth embodiment of the present invention will be omitted.

The exhaust gas filtering device according to the fourth embodiment of the present invention includes an exhaust pipe 710 and an outer case 720, a filter body 740, a third flange 750, a jacket 760, and a bypass valve 780. do.

In the fifth embodiment of the present invention, the filtration path may be defined in the direction of the arrow passing through the filter body 740, as shown in FIG.

In the fifth embodiment of the present invention, the bypass is a space between the outer case 720 and the jacket 760 through which the arrow shown in FIG. 7B passes and the exhaust gas of the third flange 750. It may be defined as a passage 751.

In the exhaust gas filtration apparatus according to the fifth embodiment of the present invention, an operating part is provided between the bypass valve support part 790 and the bypass valve support part 790 and the bypass valve 780 so that the bypass valve ( 780 includes an elastic portion 792 to provide an elastic force.

Referring to the operation of the exhaust gas filtration apparatus according to the fifth embodiment of the present invention, the exhaust gas is discharged through the filter body 740, as shown in Fig. 7 (a) in the normal operating state .

6B is a cross-sectional view showing the operation of an abnormal state of the exhaust gas filtration device according to the fourth embodiment of the present invention.

When the particulate matter PM or the like is excessively accumulated in the filter body 740 and the pressure in the exhaust gas filtration device is excessively increased, as shown in FIG. 7B, the outer case 720 is shown. The bypass valve 780 is opened by the pressure of the exhaust gas in the space between the jacket and the jacket 760.

The elastic force of the elastic portion 794 may be set in a range that does not damage the exhaust gas filtering device.

Exhaust gas filtration device according to a fifth embodiment of the present invention also has a pressure sensor (not shown) to warn the driver of maintenance or replacement, a detailed description of this configuration will be omitted.

Exhaust gas filtration devices according to the fourth and fifth embodiments of the present invention may also be configured to allow the exhaust gas to flow in the opposite direction to those shown in FIGS. 6 and 7. Since the same, detailed description is omitted.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and easily changed and equalized by those skilled in the art from the embodiments of the present invention. It includes all changes to the extent deemed acceptable.

1 is a cross-sectional view of an exhaust gas filtration device according to a first embodiment of the present invention.

Fig. 2 is a perspective view showing the structure of a filter body of the exhaust gas filtration device according to the first embodiment of the present invention.

3 is a perspective view showing the configuration of a filtration unit of an exhaust gas filtration device according to a first embodiment of the present invention.

4 is a cross-sectional view of an exhaust gas filtration device according to a second embodiment of the present invention.

5 is a cross-sectional view of an exhaust gas filtration device according to a third embodiment of the present invention.

6 is a cross-sectional view of an exhaust gas filtration device according to a fourth embodiment of the present invention.

7 is a cross-sectional view of an exhaust gas filtration device according to a fifth embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

110,510,610,710: exhaust pipe

120,420,520,620,720: outer case

130,430,530: porous tube

132,532: porous tube cover

140,440,540,640,740: filter media

150,450,550: first flange

151,156,456,551,556,651,751: exhaust gas passage

155,455,555: second flange

158,458,558: sealing mat

160,460,560: jacket

170: switching part

172: shutoff valve

180,480,580,680,780: bypass valve

190,690: Actuator

192: diaphragm

194: solenoid

490: bypass valve cover

492: discharge port

494: elastic part

590: operating part

592: operating part case

594: elastic part

596: connector

650,750: third flange

790: bypass valve support

792: elastic portion

Claims (17)

An outer case connected to the exhaust pipe; A filtering unit provided in the case to filter exhaust gas; A filtering path for supplying exhaust gas to the filtration unit; A bypass formed in the outer case so that exhaust gas is discharged by bypassing the filtration unit; And A switching device provided in the outer case so that exhaust gas is selectively introduced into the filtration path and the bypass; Exhaust gas filtration device comprising a. In claim 1, The filtration unit, A porous tube provided along a length direction of the outer case; A filter body provided in an outer circumferential direction of the porous tube; A first flange provided in a transverse direction of the porous tube to support the filter body; A second flange provided in the transverse direction of the porous tube to support the filter body and having an exhaust gas passage; And A jacket surrounding the filter medium and connecting the first flange and the second flange; Exhaust gas filtration device comprising a. 3. The method of claim 2, The filter body is an exhaust gas filtration device, characterized in that the cylindrical shape provided in plurality in the longitudinal direction of the porous tube. 3. The method of claim 2, The filter body is characterized in that the exhaust gas filtering device is provided with a plurality of layers around the porous tube. 3. The method of claim 2, 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 ( And at least one or more from the group comprising three way catalysts. 3. The method of claim 2, The switching device, A switching unit connecting the exhaust pipe and the front of the porous tube; A bypass valve provided at the switching unit to block the filtration path and the bypass; And An operating part provided to selectively open the bypass valve; Including, The rear of the porous tube is blocked, the exhaust gas filtering device, characterized in that the exhaust gas passage is formed in the first flange. In claim 6, The operation unit, Exhaust gas filtration device, characterized in that any one selected from the group comprising a diaphragm or a solenoid. In any one of claims 6 or 7, Exhaust gas filtration device, characterized in that the switching unit is provided with a shutoff valve to selectively block the switching unit. 3. The method of claim 2, The switching device, A bypass valve provided to block the porous tube; A bypass valve cover having a discharge port formed therein and coupled to the second flange; And An elastic part provided between the bypass valve and the bypass valve cover to provide an elastic force to the bypass valve; Exhaust gas filtration device comprising a. 3. The method of claim 2, An exhaust gas passage is formed in the first flange, The switching device, A chamber formed between the outer case and the first flange; A shutoff valve for selectively blocking the chamber and the porous tube; A bypass valve for blocking an exhaust gas passage formed in the first flange; And An operating unit for selectively opening the bypass valve by using the pressure of the chamber; Exhaust gas filtration device comprising a. In claim 10, The operation unit, An operation part case connected to the chamber; An elastic part provided in the operation part case; And A connector elastically supported by the elastic part and connected to the bypass valve; Exhaust gas filtration device comprising a. In claim 1, The filtration unit, A filter body laminated along the longitudinal direction of the outer case; And A third flange provided to support the filter body; Exhaust gas filtration device comprising a. The method of claim 12, Exhaust gas filtration device further comprises a jacket provided to support the filter body. The method of claim 12, 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 ( And at least one or more from the group comprising three way catalysts. The method of claim 12, The switching device, A bypass valve provided on the third flange to selectively open the third flange; And An operating part provided to selectively open the bypass valve; Characterized in that it comprises 16. The method of claim 15, The operation unit, Exhaust gas filtration device, characterized in that any one selected from the group comprising a diaphragm or a solenoid. 16. The method of claim 15, The operation unit, Bypass valve support; And An elastic part provided between the bypass valve support part and the bypass valve to provide an elastic force to the bypass valve; Exhaust gas filtration device comprising a.

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