JP2005330912A - Exhaust gas purification device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the penetration of liquid phase water generated in an exhaust path into a high voltage processing section.
An exhaust gas purifying apparatus having a high voltage processing unit in an exhaust path of an internal combustion engine, a recovery port disposed in an exhaust path outside the high voltage processing unit, and a downstream of the high voltage processing unit. A drainage pipe 4 is further provided for connecting the outlet 3 arranged in the exhaust path on the side. The liquid phase moisture recovered at the recovery port 2 is discharged from the discharge port 3 into the exhaust path via the drainage pipe 4.
[Selection] Figure 3

Description

  The present invention relates to an exhaust gas purifying apparatus including a high voltage processing unit that processes exhaust gas of an internal combustion engine by applying a high voltage.

As a technique for purifying exhaust gas of an internal combustion engine such as a vehicle, in recent years, a predetermined voltage such as NOx in exhaust gas is activated by applying a high voltage between a plurality of electrodes installed in the exhaust gas flow path, An exhaust gas purifying apparatus that promotes the reaction and converts it into a substance such as N ₂ has been proposed. For example, in Patent Document 1, a honeycomb carrier catalyst is disposed between flat electrodes to constitute a high voltage processing unit, and a DC voltage supplied from a battery is converted into a high voltage AC voltage by a high voltage power generation unit. Is applied between the flat plate electrodes of the high-voltage processing section to generate corona discharge and promote an NOx reaction to purify the exhaust gas. This exhaust gas purification device is installed in the exhaust path of a diesel engine and purifies exhaust gas from the engine.

Japanese Patent No. 3147193

  However, since the exhaust pipe constituting the exhaust path is cold when the engine is started, the moisture in the exhaust gas generated by combustion condenses (condenses) on the exhaust pipe wall in this type of device, Liquid phase water may be produced. If the amount of water in this liquid phase is very small, it is vaporized as the temperature of the exhaust pipe rises and is discharged through the high-voltage processing unit. As a result, the high voltage processing unit cannot operate normally due to changes in the discharge mode and path due to the conductivity of the liquid phase water.

  SUMMARY OF THE INVENTION An object of the present invention is to provide means for suppressing intrusion of liquid phase water generated in an exhaust path into a high voltage processing unit in an exhaust gas purification apparatus having a high voltage processing unit.

  A first aspect of the present invention is an exhaust gas purification apparatus having a high voltage processing unit in an exhaust path of an internal combustion engine, the recovery port disposed in the exhaust path outside the high voltage processing unit, and the high voltage processing unit And a drainage pipe connecting the outlet disposed in the exhaust path on the downstream side of the liquid, and water in the liquid phase recovered at the recovery port passes through the drainage pipe from the outlet. An exhaust gas purification apparatus that is discharged into an exhaust path.

  In the first aspect of the present invention, the liquid phase water recovered at the recovery port outside the high voltage processing unit is discharged from the discharge port into the exhaust path via the water drainage pipe. Infiltration of liquid phase water can be suppressed.

  According to a second aspect of the present invention, there is provided the exhaust gas purifying apparatus according to claim 1, wherein a water reservoir recess is provided in the vicinity of the recovery port, and the liquid phase water accommodated in the water reservoir recess is the water drain pipe. The exhaust gas purifying apparatus is characterized in that it is collected in a road.

  In the second aspect of the present invention, since the water reservoir recess is provided in the vicinity of the recovery port, it is possible to suitably recover the liquid phase water.

  A third aspect of the present invention is the exhaust gas purifying apparatus according to claim 1, wherein the high voltage processing unit is installed in an inner shell disposed inside an outer shell constituting the exhaust path, and the outer shell. The exhaust gas purification apparatus is characterized in that the recovery port is arranged at the bottom of the space between the inner shell and the inner shell.

  In the third aspect of the present invention, since a temperature difference is generated between the outer shell and the inner shell, moisture in the exhaust gas is well condensed on the inner wall surface of the outer shell, which is cooler than the inner shell, and the inner shell is hot. In this case, an action of evaporating a part of the condensed liquid phase water by heat radiation from the inner shell can be expected.

  A fourth aspect of the present invention is the exhaust gas purification apparatus according to any one of claims 1 to 3, further comprising a high heat capacity portion in the exhaust path upstream of the recovery port. Device.

  In the fourth aspect of the present invention, the temperature rise of the exhaust path due to the exhaust gas is delayed by the high heat capacity part, thereby condensing moisture in the pipe wall of the exhaust pipe and the moisture from the exhaust gas upstream of the high voltage processing part. Can be recovered.

  A fifth aspect of the present invention is the exhaust gas purification apparatus according to any one of claims 1 to 4, wherein a predetermined interval from the exhaust pipe is provided inside the exhaust pipe constituting the exhaust path upstream of the recovery port. An exhaust gas purifying apparatus comprising an inner tube having air permeability arranged at a distance.

  In the fifth aspect of the present invention, the exhaust gas supplied to the inside of the inner pipe leaks to the outside due to the air permeability of the inner pipe, and is supplied in the vicinity of the inner wall surface of the exhaust pipe at a reduced flow rate. Since the exhaust pipe is cooler than the inner pipe, the temperature difference between the exhaust gas and the exhaust pipe, and the low flow rate of the exhaust gas, condenses water on the upstream side of the high-voltage processing section and recovers moisture from the exhaust gas. Can promote.

  A sixth aspect of the present invention is the exhaust gas purifying apparatus according to any one of claims 1 to 5, further comprising a valve that selectively opens and closes the drain pipe.

  In the sixth aspect of the present invention, since the drainage pipe is selectively opened and closed by a valve, for example, the drainage pipe is opened only for a predetermined time after the engine is started. Can be executed.

  The valve in the sixth aspect of the present invention preferably includes a control means for opening and closing the valve as in the seventh aspect of the present invention. If this control means is an electronic control device as in the eighth aspect of the present invention, accurate control can be realized using an arbitrary parameter indicating the state of the vehicle. If the control means is a thermostat mechanism as in the ninth aspect of the present invention, it is possible to provide a device that does not require a power source and has a low risk of deterioration.

  Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, an exhaust gas purification apparatus 1 according to a first embodiment of the present invention is applied to a vehicle and is incorporated in an exhaust path of an engine 51 in order to purify exhaust gas discharged from a combustion chamber of the engine 51. The purified purification container 10 is included. A three-way catalyst 53, a purification container 10, a NOx reduction catalyst 54, and a silencer 55 are connected in this order to an exhaust manifold 52 connected to the exhaust port of the engine 51, and an exhaust path is configured by these. The engine 51 is an in-cylinder direct injection type four-cylinder diesel engine. By varying the timing of fuel injection in the combustion cycle, for example, at a light load (low rotation), a rich air-fuel mixture is present near the spark plug of the engine. It is possible to perform so-called stratified combustion by unevenly distributing the air-fuel ratio, and to perform so-called homogeneous combustion by evenly distributing the air-fuel mixture throughout the combustion chamber of the engine at high loads (during high rotation).

  In FIG. 2, the purification container 10 is formed in a substantially cylindrical shape from a heat-resistant conductive material such as metal. A high voltage processing unit 40 including a charging unit 20 and an adsorption unit 30 is provided inside the purification container 10.

  The charging unit 20 is composed mainly of two substantially cylindrical outer peripheral electrodes 21 and a thin rod-shaped central electrode 22 inserted through the outer peripheral electrode 21 so as to be positioned on the longitudinal axis. Yes. The outer peripheral electrode 21 is airtightly fitted into a substantially disc-shaped support plate 23 having two substantially circular through holes corresponding to the outer surface shape thereof, and the support plate 23 is airtight inside the purification container 10. It is fitted and fixed. The support plate 23 is made of a conductor such as SUS or copper. The conductive wire 24 connected to the center electrode 22 is inserted through the sleeve 12 made of the electrode seat 11 and the insulator and supports the center electrode 22.

  The adsorbing portion 30 includes a substantially cylindrical honeycomb structure 31 and a thin rod-shaped center electrode 32 inserted so as to be positioned on the longitudinal axis of the honeycomb structure 31 as main members. The honeycomb structure 31 is a well-known honeycomb filter made of a porous sintered body of silicon carbide. A large number of cells having a substantially square cross section are regularly formed along the axial direction, and each cell is formed by a thin cell wall. They are separated from each other. Each cell is open at the front end and the rear end thereof, whereby the upstream side and the downstream side in the purification container 10 are communicated. An oxidation catalyst made of a platinum group element (for example, Pt), a metal element such as vanadium, copper, manganese, or alumina, a metal oxide, or the like is supported on the surface of the cell wall.

  A substantially cylindrical outer peripheral electrode 33 is provided in close contact with the outer peripheral surface of the honeycomb structure 31, and the outer periphery of the outer peripheral electrode 33 is supported inside the purification container 10 by an insulating support member 34. A space between the outer peripheral surface of the honeycomb structure 31 and the purification container 10 is hermetically closed by a support material 34. The conductive wire 35 connected to the outer peripheral electrode 33 is drawn to the outside through the electrode seat 13. The conductive wire 37 connected to the center electrode 32 is drawn to the outside through the sleeve 15 made of the electrode seat 14 and the insulator.

The purification container 10 and the conductive wire 35 are electrically grounded. On the other hand, in operation, a DC pulse voltage or an AC voltage is applied to the conductive line 23, and a DC voltage is applied to the conductive line 37. Thus, materials such as NOx in the exhaust gas is activated in the charging unit 20, the reaction is accelerated, it is to convert a substance such as N _2. Further, PM (particulate matter) in the exhaust gas charged in the charging unit 20 is adsorbed on the honeycomb structure 31 by the interaction with the electric field in the adsorption unit 30, and is burned or oxidized by the action of the catalyst material. Will be promoted.

  In FIG. 3, the upstream side of the purification container 10 is connected to the exhaust pipe L <b> 1 from the above-described three-way catalyst 53. The exhaust gas purification apparatus 1 of the first embodiment is open to the recovery port 2 that is open to the exhaust path on the upstream side of the high voltage processing unit 40 and to the exhaust path on the downstream side of the high voltage processing unit 40. The drainage pipe line 4 which connects the discharged discharge port 3 is provided. Further, a box-shaped water reservoir recess 5 is provided in the vicinity of the recovery port 2 so as to cover the lower side thereof. The recovery port 2 is provided at the lowest position in the middle of the substantially cylindrical throat portion 11 constituting the inlet of the purification container 10, and includes a plurality of slits whose longitudinal direction is the circumferential direction of the throat portion 11. ing. The throat portion 11 on the downstream side of the recovery port 2 has a slight upward slope toward the purification container 10. The drainage pipe 4 is made of, for example, a SUS pipe, and the front end 4a thereof communicates with the lowest position inside the recessed portion 5 for water reservoir. 3 and the subsequent drawings, illustration of the support plate 23, the support material 34, and the like of the high voltage processing unit 40 is omitted.

In the first embodiment configured as described above, under the condition that the exhaust pipe is cooled to a temperature equivalent to the outside temperature, such as when the engine 51 is started, the reaction between HC in the exhaust and O ₂ in the air is caused by combustion. In some cases, the water H ₂ O in the generated exhaust gas is condensed (condensed) on the tube walls of each part constituting the exhaust path, so that liquid phase water is generated. This liquid-phase water is conveyed from the upstream side by the flow of the exhaust gas in the direction A in the figure, and is accommodated in the recess 5 for collecting water from the recovery port 2. The stored liquid-phase water is transported by the differential pressure before and after that due to the exhaust resistance of the high-voltage processing unit 40, and is discharged from the discharge port 3 into the exhaust path via the water drain pipe 4. The discharged water is pushed further downstream in the exhaust path by the flow of exhaust gas, evaporates as the temperature of the exhaust path rises, and is discharged from the muffler 55 as water vapor.

  A part of the liquid phase water stored in the water reservoir recess 5 gradually evaporates as the temperature of the exhaust path rises, returns to the exhaust path through the recovery port 2, and passes through the high voltage processing unit 40 to the downstream. In this case, since water is in a gas phase, there is no possibility that it will affect the operation of the high voltage processing unit 40.

  As described above, in the first embodiment, the liquid-phase water recovered at the recovery port 2 is discharged from the discharge port 3 into the exhaust path via the drainage pipe 4, and thus generated in the exhaust path. Intrusion of liquid phase water into the high voltage processing unit 40 can be suppressed.

  Moreover, in this embodiment, since the recessed part 5 for water reservoirs is provided in the vicinity of the collection | recovery port 2, the collection | recovery of liquid phase water can be performed suitably. In addition, liquid phase water flowing from the upstream side of the exhaust passage is temporarily stored in the water reservoir recess 5 until the water reservoir recess 5 is full, and then to the high voltage processing unit 40 on the downstream side thereof. Intrusion is suppressed. That is, the supply amount of liquid phase water to the drainage pipe 4 per hour is not constant, and in order to expect the action of the liquid phase water sealing the drainage pipe 4, the supply speed of the liquid phase water is high. Although it is desirable that the rate of water discharge through the drainage pipe 4 is higher, the water reservoir recess 5 acts as a buffer for isolating liquid phase water from the exhaust path. In the present invention, means for temporarily storing a water reservoir recess or liquid phase water may be provided in the middle of the drainage pipe. Furthermore, in the present invention, a configuration in which the front end portion 4a of the water drainage pipe 4 is directly connected to the bottom of the exhaust path without providing the water reservoir recess 5 can be employed. In this case, the front end 4a of the water drainage pipe 4 is It will act as a recovery port in the present invention.

  Next, a second embodiment will be described. In the exhaust gas purification apparatus 101 of the second embodiment shown in FIG. 4, a high voltage processing unit 40 is installed in an inner shell 110 disposed inside an outer shell 120 that constitutes an exhaust path.

  The outer shell 120 includes a substantially cylindrical main body 121 and a throat portion 122 having a relatively smaller diameter than the main body 121 disposed on the upstream side and the downstream side of the main body 121. The inner shell 110 includes a substantially cylindrical main body 111 having a smaller diameter than the main body 121 of the outer shell, and a throat portion 112 having a relatively smaller diameter than the main body 111 disposed on the upstream side and the downstream side of the main body 111. ing. A substantially cylindrical space 130 is formed between the outer shell 120 and the inner shell 110.

  A substantially annular mesh 131 is stretched between the throat portion 122 and the throat portion 112 on the upstream side (inlet side) so as to support the inner shell 110. The mesh 131 is made of a metal such as SUS. Further, the space between the throat portion 122 and the throat portion 112 on the downstream side (exit side) is closed by a substantially annular partition wall 132.

  A drainage pipe 104 made of, for example, a SUS pipe is provided through the lower end of the partition wall 132. The recovery port 102, which is the upstream end of the drainage pipe 104, faces the bottom portion 105 of the space 130, and the discharge port 103, which is the downstream end of the drainage pipe 104, is more than the high voltage processing unit 40. Open to the downstream exhaust path. A through hole 113 is provided in the upper part of the inner shell 110. Note that the remaining configuration of the high-voltage processing unit 40 in the second embodiment and the third and subsequent embodiments is the same as that in the first embodiment, and therefore the same reference numerals are given and detailed description thereof is omitted.

  In the second embodiment configured as described above, the outer shell 120, the inner shell 110, and the like are heated by the heat of the exhaust gas and the heat generated by the discharge and catalytic reaction in the high-voltage processing unit 40 as the engine 51 starts up. Therefore, the moisture in the exhaust gas is well condensed on the inner wall surface of the low temperature outer shell 120. The liquid-phase water generated by the condensation is transported by the differential pressure with the downstream exhaust path due to the exhaust resistance of the space portion 130, and is discharged from the discharge port 103 into the exhaust path via the drainage pipe 104. Is done.

  In addition, an action of evaporating a part of the condensed liquid phase water by heat radiation from the high temperature inner shell 10 can be expected. In this case, the vapor from the space 130 is returned to the exhaust path through the through hole 113, Although it is discharged to the downstream side through the high voltage processing unit 40, water is in a gas phase at that time, and therefore, there is no possibility that it will affect the operation of the high voltage processing unit 40. Further, the through-hole 113 is provided at a position sufficiently higher than the assumed water level of the liquid phase water, so that there is no possibility that the liquid-phase water enters the high voltage processing unit 40 through the through-hole 113.

  Next, a third embodiment will be described. In addition to the configuration of the first embodiment described above, the exhaust gas purification apparatus 201 of the third embodiment shown in FIGS. 5 and 6 includes a high heat capacity part 220 in the exhaust path upstream of the recovery port 2 and a throat part 211. Further, an inner tube 230 is provided at a position along the high heat capacity portion 220 inside the throat portion 211 and separated from the throat portion 211 by a predetermined distance.

  The high heat capacity part 220 provides an additional heat capacity for the thin throat part 211, and is made of a metal such as iron or SUS. As shown in FIG. 4, the high heat capacity part 220 has an arcuate cross section, and is fixed to the throat part 211 so as to cover the lower surface thereof. The inner tube 230 is made of a metal such as iron or SUS, and has a number of holes 230a for imparting air permeability. The inner tube 230 is fixed to the flange portion 211a of the throat portion 211 by an outward flange portion provided at the upstream end thereof.

  In the third embodiment configured as described above, the temperature rise of the exhaust path due to the exhaust gas is delayed by the high heat capacity unit 220, and thereby the moisture in the pipe wall of the exhaust line is upstream of the high voltage processing unit 40. Condensation of water and recovery of moisture from exhaust gas can be promoted.

  In the present embodiment, the exhaust gas supplied to the inside of the inner tube 230 leaks to the outside from the hole 230a due to the air permeability of the inner tube 230, and the inner wall surface of the throat portion 211 configured integrally with the high heat capacity portion 220. Is supplied in a state where the flow rate is lowered. The throat portion 211 is cooled by outside air, and its temperature rise is delayed by the high heat capacity portion 220. Therefore, it is possible to provide a temperature difference between the exhaust gas and the throat portion 211 and a low flow rate of the exhaust gas, thereby promoting moisture condensation on the upstream side and recovery of moisture from the exhaust gas with respect to the high voltage processing unit 40. In the third embodiment, both the high heat capacity portion 220 and the inner tube 230 are provided. However, in the present invention, only one of them may be provided, and such a configuration is also intended for the present invention. The effect of can be realized to a considerable extent.

  Next, a fourth embodiment will be described. The exhaust gas purifying apparatus 301 of the fourth embodiment shown in FIG. 7 includes a solenoid valve 310 that selectively opens and closes the drainage pipe 304. The solenoid valve 310 is opened and closed by a control output of an electronic control unit (ECU) 320.

  The ECU 320 is configured as a one-chip microprocessor including a CPU, a ROM, a RAM, an input / output port, a nonvolatile memory, and the like. The input port of the ECU 320 includes an air flow meter 321 provided in the intake path of the engine 51, a water temperature sensor 322 provided in the cooling water path, a crank angle sensor 323 provided in the vicinity of the crankshaft, and a throttle valve. Various sensors such as a throttle sensor 324 provided and an accelerator pedal sensor 325 provided in association with the accelerator pedal are connected.

  In ECU 320, based on signals from these various sensors (intake air amount, engine temperature, engine speed, throttle opening, accelerator pedal opening, etc.), engine 51 is warmed up and operated by the driver according to a predetermined map. A fuel injection amount corresponding to the engine 51 is calculated, a control output for a fuel injection valve (not shown) is performed with this fuel injection amount as a target value, and the generated water amount based on the operation history of the engine 51 and the high voltage processing unit 40 Also, the estimation calculation with the exhaust pipe temperature on the downstream side is performed according to a predetermined map. The switching between the stratified combustion control and the homogeneous combustion control described above is performed according to the basic injection amount as the load state of the engine 51, and the homogeneous combustion control is performed at the time of high load (at the time of high rotation / mass injection). Stratified combustion control is selected and executed at low load (low rotation and small quantity injection), but the amount of generated water is about 5 to 10% of the fuel injection quantity at the time of stratified combustion, whereas homogeneous combustion Since the fuel injection amount sometimes takes a high value of about 15%, these combustion states are also taken into account in the calculation of the amount of generated water.

  The ECU 320 outputs a control output to the solenoid valve 310 on the condition that the amount of generated water and the exhaust pipe temperature exceed a predetermined reference value, respectively, whereby the solenoid valve 310 is opened for a predetermined valve opening time. It is. This valve opening time is set to such a time that all of the estimated amount of generated water is discharged through the drainage pipe 304 under the exhaust pressure at that time, or it is allowed to pass through the high voltage processing unit 40. For the purpose of suppressing the amount of exhaust gas discharged to the downstream side, it is preferable to set the time slightly shorter than this. In this way, by opening the solenoid valve 310, the liquid phase water stored in the water reservoir recess 5 is discharged to the exhaust path downstream of the high voltage processing unit 40.

  As described above, in the fourth embodiment, the drainage pipe 304 is selectively opened and closed by the solenoid valve 310, so that water can be discharged through the drainage pipe 304 at a desired timing. Further, since the electronic control device is employed as the control means for controlling the opening and closing of the solenoid valve 310, it is possible to realize a good control using an arbitrary parameter indicating the state of the vehicle.

  In the fourth embodiment, the amount of generated water and the exhaust pipe temperature are estimated based on various parameters indicating the state of the engine 51, but individual amounts for detecting the amount of generated water and the temperature of the exhaust pipe are individually determined. A sensor may be provided, or the valve opening time of the solenoid valve 310 for a predetermined time is determined by calculation based on the elapsed time after the engine 51 is started and the engine water temperature, for example, without performing these estimations or detections. It is also possible to execute valve opening with other parameters indicating the state of the vehicle.

  Next, a fifth embodiment will be described. The exhaust gas purifying apparatus 401 of the fifth embodiment shown in FIG. 8 is provided with a thermostat valve 410 for selectively opening and closing the discharge port 103 at the discharge port 103 of the drainage pipe 104 in the second embodiment described above. It is a thing.

  As shown in FIG. 9, the thermostat valve 410 includes a bimetal 412, a valve body 413, a coil spring 414, and an adjustment screw 415 inside a main body 411. The valve body 413 is constantly urged downward in the figure by a coil spring 414, and this urging force can be adjusted by an adjustment screw 415. The thermostat valve 410 is in a state in which the valve body 413 opens the valve port 416 at normal temperature, and when the atmospheric temperature, that is, the exhaust pipe temperature rises to a predetermined set temperature, the valve body 412 is upward in the figure by the action of the bimetal 411. And the valve port 416 is closed. This set temperature can be determined experimentally to such a temperature that all of the liquid phase water stored in the space 130 is discharged from the drainage pipe 104 when the exhaust pipe temperature rises to that temperature.

  In the fifth embodiment configured as described above, it is possible to discharge water through the drainage pipe 304 at an appropriate timing by the operation of the thermostat valve 410, and to provide a device that does not require a power source and has a low risk of deterioration. Can do.

  In addition, this invention is not limited to the aspect as described in each above-mentioned embodiment, A various deformation | transformation is possible. For example, the combination of the solenoid valve 310 and the ECU 320 in the fourth embodiment is combined with the mechanical configuration and other configurations as in the second embodiment, or the thermostat valve 410 in the fifth embodiment is replaced with the first one. It goes without saying that it may be combined with a mechanical configuration as in the embodiment or other configurations. In addition, the configuration of the high-voltage processing unit in the present invention is not limited to the aspect of each of the above-described embodiments, and a processing apparatus having a structure in which flat electrodes are opposed to each other, in exhaust gas that permeates this using a net-like electrode Various devices capable of reforming exhaust gas with electric power can be used regardless of whether plasma is used or whether PM is filtered, such as a processing apparatus having a structure for collecting and incinerating PM. Belongs to the category.

1 is a side view showing an outline of an exhaust system to which an exhaust gas purification apparatus of a first embodiment of the present invention is applied. It is a side view which shows the principal part of the exhaust gas purification apparatus of 1st Embodiment. It is a side view which shows the exhaust gas purification apparatus of 1st Embodiment. It is a side view which shows the exhaust gas purification apparatus of 2nd Embodiment. It is a side view which shows the exhaust gas purification apparatus of 3rd Embodiment. FIG. 6 is a sectional view taken along line B-B in FIG. 5. It is a block diagram which shows the exhaust gas purification apparatus of 4th Embodiment. It is a side view which shows the exhaust gas purification apparatus of 5th Embodiment. It is a side view which shows the principal part of the exhaust gas purification apparatus of 5th Embodiment.

Explanation of symbols

1, 101, 201, 301, 401 Exhaust gas purification device 2 Recovery port 3,103 Discharge port 4,104,304 Drain pipe 5 Recess for water reservoir 10,110 Purification container 20 Charging unit 30 Adsorption unit 40 High voltage processing unit 310 Solenoid Valve 320 ECU
410 Thermostat valve

Claims (9)

An exhaust gas purification apparatus having a high voltage processing unit in an exhaust path of an internal combustion engine,
A drainage pipe connecting the recovery port disposed in the exhaust path outside the high voltage processing unit and the exhaust port disposed in the exhaust path downstream of the high voltage processing unit;
The exhaust gas purifying apparatus, wherein the liquid phase water recovered at the recovery port is discharged from the discharge port into the exhaust path via the drain pipe. The exhaust gas purification device according to claim 1,
An exhaust gas purifying apparatus, wherein a water reservoir recess is provided in the vicinity of the recovery port, and liquid phase water contained in the water reservoir recess is recovered in the drain pipe. The exhaust gas purification device according to claim 1,
The high-voltage processing unit is installed in an inner shell arranged inside the outer shell constituting the exhaust path, and the recovery port is arranged at the bottom of the space between the outer shell and the inner shell. An exhaust gas purification apparatus characterized by that. An exhaust gas purification apparatus according to any one of claims 1 to 3,
An exhaust gas purifying apparatus, further comprising a high heat capacity portion in the exhaust path upstream of the recovery port. An exhaust gas purification device according to any one of claims 1 to 4,
An exhaust gas purifying apparatus comprising an inner pipe having air permeability disposed at a predetermined distance from the exhaust pipe inside an exhaust pipe constituting the exhaust path upstream of the recovery port. An exhaust gas purification apparatus according to any one of claims 1 to 5,
An exhaust gas purification apparatus comprising a valve that selectively opens and closes the drain pipe. The exhaust gas purifying apparatus according to claim 6,
An exhaust gas purification apparatus further comprising control means for opening and closing the valve. The exhaust gas purifying device according to claim 7,
The exhaust gas purifying device, wherein the control means is an electronic control device. The exhaust gas purifying device according to claim 7,
The exhaust gas purifying apparatus, wherein the control means is a thermostat mechanism.

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