JP6213224B2 - Drainage device for internal combustion engine - Google Patents

Description

  The present invention relates to an internal combustion engine of a vehicle, and more particularly to a drainage device that drains moisture from intake and exhaust.

As an exhaust gas purification method for a diesel engine, a method using a NOx trap catalyst is known. The NOx trap catalyst captures NOx in exhaust gas in an oxidizing atmosphere, releases the trapped NOx in a reducing atmosphere, and reduces it to N ₂ or the like, thereby reducing the NOx emission concentration. In addition, a diesel engine-equipped vehicle is provided with a filter device that removes particulate matter (PM) in the exhaust. The NOx trap catalyst is generally downstream of the filter device from the viewpoint of heat resistance and arrangement space. Arranged on the side.

  Furthermore, an exhaust gas recirculation (EGR) system is known in which part of the exhaust gas is returned to the intake side to lower the combustion temperature of the combustion chamber and reduce NOx in the exhaust gas. The EGR system includes a high-pressure EGR system for returning exhaust gas from the turbine upstream exhaust passage of the turbocharger to the compressor downstream intake passage, and an oxidation catalyst and filter device downstream exhaust passage downstream from the turbine to the compressor upstream intake passage. There is a low pressure EGR system that returns exhaust gas. Here, in an internal combustion engine provided with cooling means such as a low-pressure EGR device and an intercooler, condensation is generated when the intake air including exhaust gas passes through the cooling means and is cooled. If this condensed water is sent together with the intake air from the intake passage to the combustion chamber, there is a risk of causing a water hammer.

  An example of an exhaust emission control device for an internal combustion engine that solves the above-described problem is disclosed in “Patent Document 1”. In this exhaust purification device, a storage tank that stores condensed water generated by the intercooler, a heating device that heats the condensed water to form steam, and a water vapor supply path that is connected to the storage tank and an exhaust passage on the upstream side of the catalyst And the condensed water is converted into water vapor and supplied to the upstream exhaust passage of the catalyst.

JP 2013-180757 A

In the above-described technology, it is prevented that condensed water is sent to the combustion chamber and causes water hammer. However, a heating device that heats the condensed water to form steam is necessary, and the installation of this device increases costs and space. Problems such as securing are likely to occur. Therefore, it is conceivable to adopt a configuration in which a condensed water discharge passage is installed in order to discharge condensed water generated in the intercooler to the upstream exhaust pipe of the exhaust aftertreatment means such as a NOx trap catalyst.
In this case, if the condensed water discharged from the outlet of the condensed water discharge passage flows to the exhaust aftertreatment means such as a NOx trap catalyst provided downstream thereof, and the catalyst is rapidly cooled by the condensed water, There is a problem that the carrier is easily cracked and the exhaust gas is deteriorated.

  Furthermore, when the engine operating region is in the low load region and the exhaust gas temperature continues to be lowered, the condensed water discharged from the outlet of the condensed water discharge passage is not sufficiently heated and vaporized. If such a state continues, the condensed water tends to enter the airflow passage inside the carrier of the exhaust aftertreatment means such as the NOx trap catalyst in a liquid state, and the clogging area is likely to increase. Therefore, in order to promote heating and vaporization of the condensed water, it is desired to adopt a configuration in which the exhaust pipe constituting member of the exhaust passage and the container body of the catalytic converter forming the enlarged diameter portion can be used as a heating source. .

  An object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to promote the heating and vaporization of the condensed water discharged from the condensed water discharge passage, resulting in the risk of clogging of the exhaust aftertreatment means or cracking of the catalyst carrier. An object of the present invention is to provide a drainage device for an internal combustion engine that can reduce the above.

According to the first aspect of the present invention, an enlarged diameter portion formed on the upstream side of the exhaust aftertreatment means disposed on the exhaust passage of the internal combustion engine, and one end of the intake passage of the internal combustion engine are connected to the exhaust aftertreatment means. A drainage passage for connecting the other end to the upstream side of the exhaust passage and discharging condensed water in the intake passage to the exhaust passage, and a rear end portion of the upstream side exhaust pipe of the exhaust aftertreatment means has the diameter-expanded A concavity and convexity portion for retaining the condensed water is formed on the inner wall surface of the enlarged diameter portion, and the enlarged diameter portion is formed from the rear end portion of the upstream exhaust pipe. It has a cone-shaped inclined portion whose pipe diameter gradually increases toward the exhaust aftertreatment means, and the uneven portion has a protrusion projecting radially inward of the exhaust passage on the inner wall of the inclined portion. Features.

According to a second aspect of the present invention, in the drainage device for an internal combustion engine according to the first aspect, the enlarged diameter portion has a cylindrical portion that extends from a rear end portion of the inclined portion and holds the exhaust aftertreatment means. the uneven portion, the front SL has a recessed been recessed radially inward of the exhaust passage to the flat portion in the gravity direction lower side of the cylindrical portion, and wherein the.

According to a fourth aspect of the present invention, in the drainage device for an internal combustion engine according to any one of the first to third aspects, the circumferential length of the upstream exhaust pipe increases as the protrusion goes downstream of the exhaust passage. A plurality of arcuate shapes are formed.

According to a third aspect of the present invention, in the drainage device for an internal combustion engine according to the second aspect , a fin is projected from the inner wall of the recess.

  According to the first aspect of the present invention, water from the other end of the drainage channel is retained in the concavo-convex portion, so that the temperature rise and evaporation of the water remaining in the concavo-convex portion can be promoted, and the condensed water passes through the exhaust aftertreatment means. After that, it can be discharged outside the vehicle. In addition, even if the amount of condensed water discharged from the drainage channel suddenly increases or decreases, it once stays in the uneven part and then gradually flows into the exhaust aftertreatment means downstream of the exhaust passage. The risk of clogging of the processing means or cracking of the catalyst carrier can be reduced.

  According to the second aspect of the present invention, the water in the intake passage stays in the liquid pool or pool formed by the protrusions and recesses of the inclined inner wall from the downstream end of the drainage channel. The risk of cracking the carrier deployed on the side can be reduced.

In the invention of claim 4 , the plurality of protrusions become longer as it goes downstream of the exhaust passage, and the amount of water staying in the liquid pool or pool becomes larger as it goes downstream. Even when the condensed water cannot be retained by the upstream protrusion, the condensed water can be reliably retained on the downstream side. Furthermore, since the condensed water stays in each protrusion with certainty, the temperature rise and evaporation of the staying water can be sufficiently promoted.
In the invention of claim 4 , since the plurality of protrusions become longer as they go downstream of the exhaust passage, and the amount of water staying in the liquid pool or pool becomes larger as it goes downstream, it is possible to sufficiently promote the temperature rise and evaporation of the staying water.

The invention of claim 3 can further promote the temperature rise and evaporation of the water in the pool formed by the fin from the recess.

1 is an overall configuration diagram of an intake / exhaust system of a vehicle-mounted diesel engine equipped with a drainage device for an internal combustion engine according to an embodiment of the present invention. FIG. 2 is an enlarged partial cutaway sectional view of a front portion of a catalytic converter used in the internal combustion engine drainage device of FIG. 1. The front part of the catalytic converter of FIG. 2 is shown, (a) is the sectional view on the AA line of FIG. 2, (b) is the enlarged view of area | region A1 of (a). FIG. 3 is an enlarged partial cutaway plan view of a front portion of a cylindrical portion of the catalytic converter of FIG. 2. It is principal part sectional drawing of the exhaust pipe of the front part of the catalytic converter used by other embodiment of this invention.

A drainage device for an internal combustion engine to which the present invention is applied will be described with reference to the following drawings.
In short, the present invention is intended to prevent the catalytic device from being damaged by previously promoting the heating and vaporization of the condensed water when draining the condensed water generated in the intake passage to the upstream side of the catalytic device in the exhaust passage. Features.
Here, the case where the drainage device for an internal combustion engine of the present invention is applied to an air supply / exhaust system of a vehicle-mounted diesel engine will be described as a first embodiment.

  A vehicle-mounted diesel engine (hereinafter referred to as an engine) 1 on which a drainage device for an internal combustion engine according to the first embodiment is mounted includes a cylinder block 2 that forms a central portion of a main body, and a cylinder head 3 is provided on the cylinder block 2. An intake pipe 4 constituting an intake passage IR is connected to the intake side of the cylinder head 3 and an exhaust pipe 5 constituting an exhaust passage ER is connected to the exhaust side. A fuel injection pump 14 is connected to the cylinder head 3 via a common rail 13. Further, the cylinder head 3 is connected to the other end of a blow-by gas passage 21 for discharging blow-by gas having one end connected to the intake pipe 4 on the downstream side of the air filter 6.

The intake pipe 4 includes an air filter 6, a low pressure throttle valve 7, a low pressure EGR valve 8, a turbocharger 9 (not shown), an intercooler 10, a high pressure throttle valve 11, a high pressure from the upstream side of the intake passage IR. An EGR valve 12 and the like are provided.
The exhaust pipe 5 is provided with a turbine, an oxidation catalyst 15, and a filter device 16 (not shown) of the turbocharger 9 from the upstream side of the exhaust passage ER on the cylinder block 2 side.

The oxidation catalyst 15 carries a noble metal catalyst such as platinum, and has an action of converting NO in the exhaust into NO ₂ and an action of oxidizing harmful components such as HC and CO in the exhaust. Yes. NO ₂ has a stronger oxidizing action than NO, and the oxidation reaction of particulate matter (diesel particulates) captured by the filter device 16 by NO ₂ is promoted. The NO ₂ is reduced and removed by a NOx trap catalyst 18 described later. The filter device 16 is a filter device (diesel particulate filter) that captures particulate matter in exhaust gas, and the captured particulate matter is burned and removed by the strong oxidizing action of NO ₂ .

An oxygen concentration sensor (LAFS) 17 for detecting the amount of oxygen concentration in the exhaust gas is provided on the downstream side of the filter device 16, and a catalytic converter in which a NOx trap catalyst 18 as a catalyst is incorporated in the container body on the downstream side. 19, an oxygen concentration sensor 20 is further provided on the downstream side. The NOx trap catalyst 18, which is an exhaust aftertreatment means disposed on the exhaust passage, captures NOx in an oxidizing atmosphere, releases the captured NOx in a reducing atmosphere containing, for example, HC, CO, etc., and nitrogen (N ₂ ). It is the purification apparatus which has the function to reduce to. That is, NO ₂ generated by the oxidation catalyst 15 and NO remaining in the exhaust gas without being oxidized by the oxidation catalyst 15 are captured, reduced to nitrogen (N ₂ ), and released.

  A high pressure EGR device 22 having a high pressure EGR pipe 23 and a high pressure EGR cooler 24 is disposed below the high pressure EGR valve 12. The high pressure EGR pipe 23 has one end connected to the intake pipe 4 between the high pressure throttle valve 11 and the cylinder head 3 and the other end connected to the exhaust pipe 5 between the cylinder head 3 and the turbine of the turbocharger 9. A high-pressure EGR cooler 24 is provided in the middle. One end of the high pressure EGR pipe 23 is opened and closed by the high pressure EGR valve 12.

  Below the low pressure EGR valve 8, a low pressure EGR device 25 is disposed as an exhaust gas recirculation device having a low pressure EGR pipe 26 and a low pressure EGR cooler 27. One end of the low pressure EGR pipe 26 is connected to the intake pipe 4 between the low pressure throttle valve 7 and the compressor of the turbocharger 9, and the other end is connected to the exhaust pipe 5 between the filter device 16 and the NOx trap catalyst 18. A low pressure EGR cooler 27 is provided in the middle. One end of the low pressure EGR pipe 26 is opened and closed by the low pressure EGR valve 8.

Next, a drainage device M for an internal combustion engine according to Embodiment 1 of the present invention that causes condensed water generated in the intake passage IR to flow into the exhaust passage ER through the drain pipe 28 that forms the drain passage wr will be described.
In this drainage channel wr, an inlet 281 at one end is downstream of the intercooler and is connected to the intake pipe 4 between the intercooler 10 and the high-pressure throttle valve 11, and the NOx trap catalyst 18 as exhaust aftertreatment means. A drain outlet 282 at the other end is connected to the upstream side of the exhaust passage.
An opening / closing valve 29 is provided in the middle of the drain pipe 28, and a control means 30 for controlling opening / closing of the opening / closing valve is connected to the opening / closing valve 29.

  As described above, the control means 30 opens the on-off valve 29 when the amount of condensed water stored in the drain pipe 28 reaches a certain amount, or when the operation time or travel distance of the engine 1 reaches a certain value. And has a function of discharging the condensed water in the drain pipe 28 through the catalytic converter 19 to the outside of the vehicle. Further, the control means 30 detects the oxygen concentration in the intake gas leaked from the drain pipe 28 and the oxygen concentration sensor 20 leaks through the drain pipe 28, and when this reaches a predetermined value on the lean side, the drain pipe 28. Therefore, it is determined that the condensed water has been completely removed from the valve, and the on-off valve 29 is closed. The control of the control means 30 prevents the intake gas from being discharged from the drain pipe after the drain of the condensed water from the drain pipe 28 is completed, thereby causing a decrease in torque and output of the engine 1.

Next, as shown in FIG. 1, the upstream side exhaust pipe 501 forming the exhaust passage ER has a boss on the upper part of the outer wall at a position Le apart upstream in the exhaust passage direction X from the joint position with the enlarged diameter front part 192. 31 is welded. The drain side which is the other end of the drain pipe 28 is connected to the upper end side of the through hole provided in the boss 31. A lower end side of the through hole of the boss 31 penetrates the upstream exhaust pipe 501 and forms a drain outlet 282 toward the inside of the exhaust path ER.
A catalytic converter 19 having a NOx trap catalyst (exhaust aftertreatment means) 18 as exhaust aftertreatment means is connected to the rear end of the upstream side exhaust pipe 501.
The catalytic converter 19 forms an enlarged diameter portion of the exhaust passage ER, and includes a cylindrical container body (shell). The cylindrical container body includes a cylindrical main portion 191 that accommodates and holds the NOx trap catalyst 18, an enlarged diameter front portion 192 that is an enlarged diameter portion on the front side of the exhaust passage formed continuously with the main portion 191, and a rear side of the exhaust passage. And an enlarged diameter rear portion 193.

More specifically, the catalytic converter 19 has a cone-shaped enlarged front portion in which the pipe diameter gradually increases from the exhaust pipe rear end portion of the upstream side exhaust pipe 501 toward the NOx trap catalyst (exhaust aftertreatment means) 18. 192 (a part of the inclined portion) and a main portion 191 as a cylindrical portion that extends from the rear end portion of the enlarged diameter front portion 192 and holds the NOx trap catalyst (exhaust aftertreatment means) 18.
As described above, the front end of the enlarged diameter portion 192 overlaps and welds the upstream exhaust pipe 501 upstream of the exhaust passage, and the enlarged diameter rear portion 193 has a cone-shaped inclined portion that gradually reduces the exhaust passage diameter toward the downstream. And is welded to the downstream side exhaust pipe 502 which is the rear end portion of the exhaust pipe on the downstream side of the exhaust passage.

As shown in FIG. 2, the cone-shaped enlarged front part 192 whose pipe diameter gradually increases has its rear end enlarged toward the downstream side in the exhaust passage direction X from the joining position, and its rear end is enlarged from the front end. The lowermost side in the gravitational direction g forms an inclined surface f2 that descends from the front end toward the rear end.
As shown in FIG. 2, condensed water is retained in the inclined surface f2 of the inner wall of the inclined portion of the enlarged diameter front portion 192 that is an inclined portion and the flat portion f3 on the lower side in the gravity direction of the cylindrical main portion 191 that follows. Concave and convex portions that cause the liquid pool D1 are formed. Here, on the inclined surface f2 of the inner wall of the inclined portion of the enlarged diameter front portion 192, a protrusion 41 that forms an uneven portion protruding radially inward of the exhaust passage ER is formed, and the flat portion below the main portion 191 in the gravity direction is formed. In the portion f3, a pool 42 is formed as a concave portion that forms a concave and convex portion that is recessed with respect to the radially inner side of the exhaust passage ER, and each generates a liquid pool D1.

More specifically, as shown in FIGS. 3A and 3B, here, a plurality of parallel protrusions 41 protrude from the inclined surface f2. For this reason, each protrusion 41 and the inclined surface f2 of the inner wall form a liquid pool D1 that is long in the circumferential direction. Here, each protrusion 41 and the liquid reservoir D1 are arranged in the circumferential direction of the inclined surface f2 of the inner wall of the diameter-expanded front portion 192 as it goes downstream in the exhaust passage direction X (lower side when viewed from the front in FIG. 3B). A plurality of arcuate shapes in which the length in the direction of reference sign R in the figure becomes longer along the center line CL toward the lower side.
On the other hand, as shown in FIG. 2, an uneven portion is formed on the front portion f1 of the NOx trap catalyst (exhaust aftertreatment means) 18 on the front end side of the main portion 191 and on the flat portion f3 below the gravity direction g. A pool 42 (having a large-capacity liquid reservoir D1) is formed. The pool 42 retains the condensed water that has flowed through the inclined surface f2, and promotes the heating and evaporation of the condensed water by the heat held by the main portion 191 and the heat of the flowing exhaust gas. As shown in FIG. 4, the pool 42 has a plurality of fins 43 assembled in a lattice shape in a plan view in the room, and the plurality of fins 43 enhance the heat conduction of the exhaust gas to condense water. Promotes heating and evaporation.

The operation of such a drainage device M1 for an internal combustion engine will be described.
During operation of the engine 1, particularly when the low pressure EGR device 25 is used, a large amount of condensed water is generated at the outlet of the intercooler 10. The generated condensed water is sent to the upstream side exhaust pipe 501 of the NOx trap catalyst 18 through the drainage channel wr, and is discharged outside the vehicle through the downstream catalytic converter 19. In this case, when the on-off valve 29 provided in the middle of the drain pipe 28 that forms the drain channel wr is closed, it is stored in the drain pipe 28. The on-off valve 29 is controlled when the amount of condensed water stored by a water level sensor (not shown) provided in the drain pipe 28 reaches a certain amount, or when the operation time or travel distance of the engine 1 reaches a certain value. The means 30 is driven to open the valve.

  Exhaust gas flowing through the exhaust passage ER during the operation of the engine 1 passes through the exhaust pipe 5 and flows into the container body (shell) 190, where it diffuses to the carrier front surface f1 holding the NOx trap catalyst 18. Inflow. At that time, a drain outlet 282 is opened in the upstream exhaust pipe 501, the exhaust flow velocity at the same position is large, and the upstream exhaust pipe internal pressure Per is relatively small. For this reason, the condensed water at the outlet portion of the intercooler 10 is sucked out from the drain port 282 as shown in FIG. 2 due to the pressure difference through the drain pipe 28 due to the venturi effect, and the diameter is expanded through the distance Le portion of the upstream side exhaust pipe 501. Flows into the front 192.

  At this time, as shown in FIG. 2, the condensed water flowing out from the drain port 282 flows while being deflected downward in the gravity direction g at the distance Le portion of the upstream side exhaust pipe 501, and is heated by the exhaust gas and the inner wall surface. The Further, as shown in FIG. 3B, the condensed water that has flowed from the upstream side exhaust pipe 501 to the diameter-expanded front portion 192 is restricted in flow by a plurality of parallel protrusions 41 on the inclined surface f2, and each protrusion 41 is In the liquid pool D1 formed by the protrusions 41, the condensed water becomes exhaust gas and the diameter-expanded front part 192 as it temporarily stays in the circumferentially long liquid pool D1 to be formed and heated and sequentially flows downstream. It is vaporized by receiving heat from the inclined surface f2 of the inner wall of the inner wall and evaporated.

Thereafter, the condensed water that has passed through the diameter expansion front portion 192 flows into the pool 42 of the flat portion f3 below the gravity direction g, and here also the condensed water is exhaust gas, the inner wall of the pool 42, and a plurality of lattice fins. It vaporizes in response to the heat of 43 and evaporates.
Thereafter, the condensed water having a high temperature joins with the exhaust gas or the vaporized condensed water and is introduced into the catalytic converter 19 (exhaust aftertreatment device), so that the catalytic converter 19 is clogged or the catalyst carrier cracks. Risk can be reduced.
As described above, in the drainage device M1 of the internal combustion engine of the first embodiment, the condensed water flowing out from the drain outlet 282 is heated by the exhaust gas and the inner wall surface at the distance Le portion of the upstream side exhaust pipe 501, and then the diameter is expanded. The liquid pool D1 which is long in the circumferential direction formed by the plurality of protrusions 41 of the front portion 192, the heat of the inner wall of the pool 42 and the plurality of lattice-like fins 43 of the flat portion f3, and at the same time, can be further efficiently heated.

  In particular, since the plurality of protrusions 41 become longer as they go downstream of the exhaust passage, and the amount of water staying in the liquid pool D1 or the pool 42 increases as it goes downstream, it should be upstream regardless of the amount of condensed water discharged from the drainage passage. Even if the condensed water cannot be retained by the protrusions, the condensed water can be reliably retained on the downstream side. Furthermore, since the condensed water stays in each protrusion 41 reliably, the temperature rise and evaporation of the staying water can be sufficiently promoted. Since the vaporized condensed water is introduced into the exhaust gas aftertreatment device, the risk of clogging or catalyst carrier cracking can be reduced.

In the drainage device M1 of the internal combustion engine of the first embodiment described above, the condensed water flowing out from the drain port 282 is heated by the exhaust gas and the inner wall surface at the distance Le portion of the upstream side exhaust pipe 501. Next, a drainage device M2 for an internal combustion engine according to Embodiment 2 as shown in FIG. 5 will be described.
Since the drainage device M2 for the internal combustion engine according to the second embodiment is different from the configuration of the first embodiment only in that the distance Le portion of the upstream exhaust pipe 501 is the bellows pipe 44, other redundant description is omitted.

In this case, the condensed water flowing out from the drain outlet 282 is heated by the exhaust gas and the inner wall surface in the plurality of liquid reservoirs D1 on the inner wall portion of the bellows tube 44 at the distance Le portion of the upstream exhaust pipe 501, and then before the diameter expansion. Heat is generated by the exhaust gas and the inner wall surface in the pool 42 formed by the protrusion 41 of the portion 192 and the pool 42 having a large volume of the flat portion f3. In this case, in particular, heating by the bellows tube 44 at a distance Le is added, and the condensed water is further heated, the vaporization of the condensed water is promoted, and introduced into the exhaust aftertreatment device. Risk can be further reduced.
In the above description, the drainage device of the internal combustion engine is mounted on the on-board diesel engine. However, it may be mounted on a stationary diesel engine depending on the case, and may be further mounted on a gasoline engine. Almost the same effect can be obtained.

1 Internal combustion engine
4 Intake passage (intake pipe)
5 Exhaust passage (exhaust pipe)
501 Upstream exhaust pipe 9 Turbocharger (turbocharger)
10 Intercooler 18 Catalyst (NOx trap catalyst)
19 Catalytic converter 191 Main part (cylinder part)
192 Expanded front (expanded portion)
25 Exhaust gas recirculation device (low pressure EGR device)
28 Drainage channel (drainage pipe)
41 Protrusion (concave / convex)
42 pool
f2 Inclined surface D1 Liquid reservoir ER Exhaust passage M1-M2 Drainage device for internal combustion engine X Exhaust passage direction

Claims (4)

An enlarged diameter portion formed on the upstream side of the exhaust aftertreatment means disposed on the exhaust passage of the internal combustion engine;
A drainage passage for connecting one end to the intake passage of the internal combustion engine and connecting the other end to the upstream side of the exhaust passage of the exhaust aftertreatment means to discharge condensed water in the intake passage to the exhaust passage;
With
The rear end portion of the upstream exhaust pipe of the exhaust aftertreatment means is connected to the exhaust aftertreatment means via the enlarged diameter portion,
An uneven portion for retaining the condensed water is formed on the inner wall surface of the enlarged diameter portion ,
The expanded diameter portion has a cone-shaped inclined portion in which the tube diameter gradually increases from the rear end portion of the upstream exhaust pipe toward the exhaust aftertreatment means,
The concavo-convex part has a protrusion projecting radially inward of the exhaust passage on the inner wall of the inclined part,
A drainage device for an internal combustion engine. The diameter-expanding portion has a cylindrical portion that extends from a rear end portion of the inclined portion and holds the exhaust aftertreatment means,
The uneven portion, the have a radially inwardly recessed by a recess in the exhaust passage to the flat portion in the gravity direction lower side of the front Symbol cylindrical portion,
Drainage device of the internal combustion engine as set forth in claim 1, characterized in that. Fins protruded from the inner wall of the recess,
3. The drainage device for an internal combustion engine according to claim 2, wherein the drainage device is an internal combustion engine. The protrusion has a plurality of arcuate shapes in which the length in the circumferential direction of the exhaust pipe becomes longer as it goes downstream of the exhaust passage.
The drainage device for an internal combustion engine according to any one of claims 1 to 3, wherein the drainage device is an internal combustion engine.

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