JP2009299476A - Foreign matter removal device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foreign matter removal device for an internal combustion engine, suppressing outflow of collected foreign matter by comparatively simple structure. <P>SOLUTION: This foreign matter removal device 30 includes a collecting chamber 31 provided in a low-pressure EGR passage 17 provided to the internal combustion engine 1 for collecting the foreign matter in exhaust gas, having an inlet 32 and an outlet 33 respectively arranged in a position higher than a bottom surface 31a, and allowing the exhaust gas led to flow into from the inlet 32 to be discharged from the outlet 33 through an inside. The collecting chamber 31 is provided with a baffle plate 34 so that a down portion 35 allowing the exhaust gas led to flow into from the inlet 32 to flow downwardly toward the bottom surface 31a and an up portion 36 arranged downstream of the down portion 35 and allowing the exhaust gas to flow upwardly from the bottom surface 31a toward the outlet 33 are formed inside of the collecting chamber 31. The baffle plate 34 is arranged such that the flow passage cross-sectional area A of the up portion 36 is larger than a predetermined cross-sectional area α with terminal speed V of target foreign matter P and a flow rate of exhaust gas flowing in the up portion 36 made the same. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a foreign matter removing apparatus for an internal combustion engine for separating and removing foreign matter from exhaust gas.

  In order to separate the particulate matter (PM) contained in the exhaust of the internal combustion engine from the exhaust, the flow of the exhaust is changed by a deflection plate provided in the middle of the exhaust pipe to generate centrifugal force on the particulate matter. There is known an exhaust purification device that captures and accumulates particulate matter separated from an exhaust flow by centrifugal force in a volume chamber provided on a side wall and opening to the exhaust pipe (see Patent Document 1). In addition, Patent Documents 2 and 3 exist as prior art documents related to the present invention.

JP 2007-107399 A JP 2003-97361 A JP 2000-170608 A

  In the apparatus of Patent Document 1, in order to prevent foreign matter such as collected particulate matter from flowing out of the volume chamber, the size of the foreign matter is increased and contacted with the foreign matter captured in the volume chamber, Oil is sprayed on. In this case, since a discharge device and an oil addition valve for enlarging foreign matter are necessary, the device may be complicated and large. Further, it is also disclosed that a collection tank communicated with the volume chamber through a communication path is provided, and the collected foreign matter is moved from the volume chamber to the collection tank to prevent the foreign matter from flowing out. It is necessary to provide a collection tank separately from the volume chamber.

  Therefore, an object of the present invention is to provide a foreign matter removing apparatus for an internal combustion engine that can suppress the outflow of foreign matter collected with a relatively simple configuration.

  A foreign matter removing apparatus for an internal combustion engine according to a first aspect of the present invention includes an inlet and an outlet that are provided in a passage through which exhaust gas included in the internal combustion engine flows to collect foreign matter in exhaust gas, and are respectively positioned higher than the bottom surface. And a collection chamber in which exhaust gas flowing in from the inlet passes through the interior and is discharged from the outlet, and the collection chamber is lowered so that the exhaust gas flowing in from the inlet flows downward toward the bottom surface A wall portion is provided such that a rising portion disposed downstream of the lowering portion and flowing so that the exhaust gas rises from the bottom side toward the outlet is formed in the collection chamber, The wall portion is configured so that the flow path cross-sectional area of the rising portion balances the gravity acting on the target foreign matter to be collected in the collection chamber and the upward force applied to the target foreign matter by the exhaust gas flowing through the rising portion. At the end of the target foreign matter By the flow rate of the exhaust gas flowing through the speed and the rise portion is arranged to be larger than the predetermined cross-sectional area is the same, to solve the problems described above (claim 1).

  In the first foreign matter removing apparatus of the present invention, the flow passage cross-sectional area of the rising portion is larger than the predetermined cross-sectional area where the terminal velocity of the target foreign matter and the flow velocity of the exhaust gas flowing through the rising portion are the same. Can be lowered. Therefore, the target foreign matter can be separated from the exhaust and collected. In addition, by increasing the flow passage cross-sectional area of the ascending portion above a predetermined cross-sectional area, the flow velocity of the exhaust gas in the ascending portion can be made smaller than the terminal speed of the target foreign matter. Even if the collected target foreign matter rises with the exhaust, the raised target foreign matter can be quickly lowered. And in the 1st foreign material removal apparatus of this invention, it is not necessary to provide an apparatus other than a collection chamber. Therefore, it is possible to suppress the outflow of foreign matter collected with a relatively simple configuration.

  In one form of the first foreign matter removing apparatus of the present invention, the bottom surface is provided with a plurality of plate members extending upward from the bottom surface and extending in a direction intersecting with the flow direction of the exhaust gas in the collection chamber. (Claim 2). In this case, foreign substances are collected in the plurality of spaces formed on the bottom surface of the collection chamber by the plurality of plate members, so that the collected foreign substances can be prevented from moving downstream on the bottom surface. Whilst exhaust flows in the collection chamber, vortex flows are generated in these multiple spaces, but the flow velocity of this vortex flow is lower than the flow velocity of the exhaust flow that flows from the inlet to the outlet in the collection chamber. It is possible to suppress the foreign matter collected in the above from being rolled up. Therefore, the collected foreign substance can be further prevented from flowing out.

  The foreign matter removing apparatus for a second internal combustion engine of the present invention is provided in a passage through which exhaust gas provided in the internal combustion engine flows so as to collect foreign matter in the exhaust gas, and has an inlet and an outlet respectively disposed at positions higher than the bottom surface. And a collection chamber in which exhaust gas flowing in from the inlet passes through the interior and is discharged from the outlet, and the collection chamber is lowered so that the exhaust gas flowing in from the inlet flows downward toward the bottom surface A wall portion is provided such that a rising portion disposed downstream of the lowering portion and flowing so that the exhaust gas rises from the bottom side toward the outlet is formed in the collection chamber, The bottom surface is provided with a plurality of plate members extending upward from the bottom surface and extending in a direction intersecting with the flow direction of the exhaust gas in the collection chamber, thereby solving the above-described problem.

  According to the second foreign matter removing apparatus of the present invention, the foreign matter is collected in the plurality of spaces formed on the bottom surface of the collection chamber by the plurality of plate members as described above. Can be prevented from moving downstream. In addition, the flow velocity of the vortex generated in these spaces is lower than the flow velocity of the exhaust flowing through the collection chamber from the inlet to the outlet, so that the foreign matter collected in these spaces is wound up. Can be suppressed. And in the 2nd foreign material removal apparatus of this invention, it is not necessary to provide an apparatus other than a collection chamber. Therefore, it is possible to suppress the outflow of foreign matter collected with a relatively simple configuration.

  In the first and second foreign matter removing apparatuses of the present invention having a plurality of plate members, the plurality of plate members are inclined from the bottom so as to be inclined toward the upstream side in the exhaust flow direction in the collection chamber. Each may extend upward (claim 4). In this case, since the openings of the plurality of spaces formed by the plurality of plate members face the upstream side of the exhaust flow, entry of foreign matter into these spaces can be promoted. As described above, since the foreign matter collected in the space is difficult to be wound upward by the exhaust, it is possible to further suppress the collected foreign matter from flowing out of the collection chamber.

  As described above, according to the foreign matter removing apparatus of the present invention, the flow passage cross-sectional area of the ascending portion is made larger than the predetermined cross-sectional area where the terminal velocity of the target foreign matter and the flow velocity of the exhaust gas flowing through the ascending portion are the same. By providing a plurality of plate members on the bottom surface of the collection chamber, it is possible to suppress the collected foreign matter from being rolled up. Therefore, it can suppress that the foreign material collected with the comparatively simple structure flows out of the collection chamber.

(First form)
FIG. 1 shows an outline of an internal combustion engine incorporating a foreign matter removing apparatus according to a first embodiment of the present invention. An internal combustion engine (hereinafter also referred to as an engine) 1 in FIG. 1 is a diesel engine mounted on a vehicle as a driving power source, and an engine body provided with a plurality (four in FIG. 1) of cylinders 2. 3 and an intake passage 4 and an exhaust passage 5 connected to the respective cylinders 2. In the intake passage 4, an air filter 6 for intake air filtration, a first throttle valve 7 for adjusting the amount of intake air, a compressor 8a of a turbocharger 8, an intercooler 9 for cooling intake air, and an intake air A second throttle valve 10 for adjusting the amount of air is provided in order from the upstream side of the intake flow. In the exhaust passage 5, a fuel addition valve 11 for injecting fuel into the exhaust passage 5, a turbine 8 b of the turbocharger 8, an exhaust purification catalyst 12 and a filter 13 for purifying exhaust gas are provided from the upstream side of the exhaust flow. It is provided in order. For example, a three-way catalyst is provided as the exhaust purification catalyst 12. The filter 13 is provided with a particulate filter that collects particulate matter (PM) contained in the exhaust gas. Each cylinder 2 is provided with an injector 14 for injecting fuel into the cylinder 2. Each injector 14 is connected to a common rail 15 in which high-pressure fuel supplied to the injector 14 is stored.

  The exhaust passage 5 and the intake passage 4 are connected by a high pressure EGR passage 16 and a low pressure EGR passage 17. As shown in FIG. 1, the high pressure EGR passage 16 connects the exhaust passage 5 upstream of the turbine 8 b and the intake passage 4 downstream of the second throttle valve 10. On the other hand, the low pressure EGR passage 17 connects the exhaust passage 5 downstream of the filter 13 and the intake passage 4 upstream of the compressor 8a. The high-pressure EGR passage 16 is provided with a high-pressure EGR valve 18 that adjusts the flow rate of exhaust gas (hereinafter also referred to as EGR gas) that is recirculated to the intake passage 4 through the high-pressure EGR passage 16. The low pressure EGR passage 17 is provided with an EGR cooler 19 for cooling the EGR gas, and a low pressure EGR valve 20 for adjusting the flow rate of the EGR gas recirculated to the intake passage 4 through the low pressure EGR passage 17.

  As shown in FIG. 1, a foreign substance removing device 30 is provided in the low pressure EGR passage 17. Therefore, the low pressure EGR passage 17 corresponds to a passage through which the exhaust gas of the present invention flows. As is well known, the EGR gas contains foreign substances such as particulate matter. The EGR gas recirculated to the intake passage 4 via the low pressure EGR passage 17 then passes through the compressor 8a, the intercooler 9, and the second throttle valve 10. For this reason, if the EGR gas contains foreign matter P such as, for example, biting into the rotating portion of the compressor 8a or foreign matter P adhering to the intercooler 9, this may cause the compressor 8a or the intercooler 9 to malfunction. Become. Therefore, the foreign matter removing device 30 removes the foreign matter P that adheres to the intercooler 9 or bites into the compressor 8a from the EGR gas. Hereinafter, the foreign matter to be removed by the foreign matter removing device 30 may be referred to as a target foreign matter P.

  As shown in FIG. 2 in an enlarged manner, the foreign matter removing device 30 includes a collection chamber 31 for collecting the target foreign matter P from the EGR gas. In FIG. 2, arrows F all indicate the flow of exhaust. The collection chamber 31 is attached to the engine 1 so that the bottom surface 31a is disposed at the lowest position. The collection chamber 31 includes an inlet 32 for introducing EGR gas into the inside and an outlet 33 for discharging EGR gas from the inside. As shown in FIG. 2, the inlet 32 and the outlet 33 are arranged at positions higher than the bottom surface 31 a of the collection chamber 31. As shown in FIG. 2, a baffle plate 34 is provided as a wall inside the collection chamber 31. The baffle plate 34 is provided so as to extend from the top surface 31b of the collection chamber 31 toward the bottom surface 31a. Further, the baffle plate 34 is provided such that the lower end thereof does not contact the bottom surface 31 a of the collection chamber 31, that is, the exhaust can flow through the lower portion of the baffle plate 34. As shown in FIG. 2, the baffle plate 34 is disposed so as to face the inlet 32. Therefore, the baffle plate 34 can prevent the EGR gas from going straight from the inlet 32 to the outlet 33. By providing the baffle plate 34 in this way, the collection chamber 31 has a descending portion 35 that flows in such a manner that the exhaust gas flowing in from the inlet 32 descends toward the bottom surface 31a as indicated by an arrow Fd in FIG. As shown by the arrow Fu in FIG. 2, an ascending portion 36 that flows so that the exhaust gas rises from the bottom surface 31 a side toward the outlet 33 can be formed.

  Next, the flow path cross-sectional area A of the ascending portion 36 will be described with reference to FIG. 3 shows the relationship between the flow velocity of exhaust gas flowing from the bottom surface 31a toward the outlet 33 in the ascending portion 36 (hereinafter sometimes referred to as “rising exhaust gas flow velocity”) and the flow path cross-sectional area A of the ascending portion 36. An example is shown. 3 shows the force acting on the target foreign object P in the ascending portion 36. Since the exhaust gas flows from the bottom surface 31a side toward the outlet 33 in the ascending portion 36, the exhaust gas applies an upward force to the target foreign matter P as indicated by an arrow U in the lower diagram of FIG. The upward force increases as the ascending exhaust flow rate increases. Further, as indicated by an arrow G in the lower diagram of FIG. Therefore, the target foreign matter P rises with the exhaust in the ascending portion 36 by making the rising exhaust flow velocity in which the upward force acting on the target foreign matter P balances with the gravity, that is, the rising exhaust flow velocity lower than the terminal velocity V of the target foreign matter P. This can be suppressed. As shown in the upper diagram of FIG. 3, the rising exhaust flow velocity decreases as the flow passage cross-sectional area A of the rising portion 36 increases. Therefore, a value larger than the predetermined cross-sectional area α at which the ascending exhaust flow velocity and the terminal velocity V of the target foreign matter P are the same is set in the flow path cross-sectional area A of the ascending portion 36. That is, the flow path cross-sectional area in the range indicated by the oblique lines in the upper diagram of FIG. 3 is set. The channel cross-sectional area A of the ascending portion 36 can be adjusted at the position where the baffle plate 34 is disposed. Therefore, the baffle plate 34 is disposed so that the flow path cross-sectional area A of the rising portion 36 is larger than the predetermined cross-sectional area α.

  According to the foreign matter removing device 30, the exhaust gas flowing into the inside through the inlet 32 first descends toward the bottom surface 31 a at the descending portion 35, and then ascends from the bottom surface 31 a toward the outlet 33 at the ascending portion 36. At this time, since the rising exhaust flow velocity is smaller than the terminal velocity V of the target foreign matter P, the target foreign matter P can be separated from the EGR gas and collected. Further, even if the target foreign matter P once collected is wound up by exhaust, the ascending exhaust flow velocity is smaller than the terminal velocity V of the target foreign matter P, so that the wound up target foreign matter P is sufficiently discharged from the outlet 33 to the outside. Can be suppressed.

  As described above, according to the foreign matter removing apparatus 30 of the first embodiment, the predetermined sectional area α in which the flow passage cross-sectional area A of the ascending portion 36 is the same as the rising exhaust flow velocity and the terminal velocity V of the target foreign matter P. Since it is larger, it is possible to suppress the collected target foreign matter P from being rolled up, or to quickly separate the collected target foreign matter P from the exhaust gas and collect it again. Since the flow path cross-sectional area A of the ascending portion 36 can be changed at the position of the baffle plate 34, it is possible to prevent the target foreign matter P collected without providing a device other than the collection chamber 31 from flowing out. Therefore, the target foreign matter P collected with a relatively simple configuration can be prevented from flowing out of the collection chamber 31.

  The target foreign matter P collected in the collection chamber 31 is taken out and discarded when maintenance of the engine 1 such as a vehicle inspection is performed. In this case, the volume of the collection chamber 31 is set such that the target foreign matter P can be held inside from the previous maintenance to the next maintenance. In addition, a heater may be provided on the floor 31a of the collection chamber 31, and the target foreign matter P collected by this heater may be burned and removed at predetermined intervals. In this case, the volume of the collection chamber 31 can be reduced. By periodically removing the target foreign matter P collected in the collection chamber 31 in this way, the collection chamber 31 is prevented from being filled with the target foreign matter P, and the target foreign matter P flows out of the collection chamber 31. Can be suppressed.

(Second form)
Next, a foreign substance removing apparatus according to a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a view corresponding to FIG. 2 of the first embodiment, that is, a view showing the inside of the collection chamber 31. As shown in FIG. 4, this embodiment is the same as the first embodiment except that a plurality of fins 40 as plate members are provided on the bottom surface 31a of the collection chamber 31. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 4, in the foreign matter removing apparatus 30 according to the second embodiment, a plurality of fins 40 extending from the bottom surface 31 a toward the top surface 31 b are provided on the bottom surface 31 a of the collection chamber 31. The plurality of fins 40 are provided so as to extend in a direction transverse to the flow direction of the exhaust gas in the collection chamber 31. Each fin 40 is provided over the entire bottom surface 31a of the collection chamber 31 in the width direction of the collection chamber 31, that is, in the direction perpendicular to the paper surface. The height of each fin 40 is set so that the upper end of the fin 40 is positioned below the lower end of the baffle plate 34. Thus, by providing the plurality of fins 40 on the bottom surface 31 a of the collection chamber 31, a plurality of spaces S partitioned by the plurality of fins 40 can be formed on the bottom surface 31 a of the collection chamber 31. Then, as shown by the arrows FP in FIG. 4, the target foreign matter P can be collected in each of the plurality of spaces S. Therefore, it is possible to suppress the collected target foreign matter P from moving downstream in the collection chamber 31. In addition, as shown in FIG. 4, when the exhaust gas flows through the collection chamber 31 from the inlet 32 toward the outlet 33, a vortex W is generated in each space S due to the flow of the exhaust gas. This is sufficiently smaller than the flow velocity of the exhaust gas flowing from the inlet 32 toward the outlet 33 in the collection chamber 31. Therefore, it is possible to suppress the collected target foreign matter P from being rolled up.

  Thus, in the foreign substance removal apparatus 30 of the second embodiment, since the plurality of fins 40 are provided on the bottom surface 31a of the collection chamber 31, the target foreign substances P can be collected in the space S formed by these fins 40, respectively. . Therefore, the target foreign matter P can be prevented from moving downstream in the collection chamber 31. Moreover, since the flow velocity of the vortex W generated in each space S is sufficiently small, it is possible to prevent the collected target foreign matter P from being rolled up. Also in the second embodiment, it is not necessary to provide a device other than the collection chamber 31. Therefore, the target foreign matter P collected with a relatively simple configuration can be prevented from flowing out of the collection chamber 31.

(Third form)
A foreign matter removing apparatus according to a third embodiment of the present invention will be described with reference to FIG. In addition, FIG. 5 is a figure which shows the inside of the collection chamber 31 of this form. This embodiment is different from the second embodiment in that the plurality of fins 40 provided on the bottom surface 31a of the collection chamber 31 are inclined to the upstream side of the exhaust flow in the collection chamber 31 as shown in FIG. . Other than that is the same as the second embodiment. For this reason, portions common to the first and second embodiments are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 5, the plurality of fins 40 are inclined toward the upstream side of the exhaust flow, so that the openings of the spaces S face the upstream side of the exhaust flow. Therefore, the entry of the target foreign matter P into the space S can be promoted. In addition, by tilting the fins 40 in this way, the target foreign matter P can be guided into the space S even if the interval between the fins 40 is narrowed. And by narrowing the space | interval of fins 40 in this way, it can further suppress that the collected target foreign material P is rolled up.

  In the foreign matter removing apparatus 30 according to the third embodiment, since the plurality of fins 40 inclined to the upstream side of the exhaust flow are provided on the bottom surface 31a of the collection chamber 31, the target to each space S formed by these fins 40 is provided. The entry of the foreign matter P can be promoted. In addition, by tilting the fin 40, it is possible to further suppress the collected target foreign matter P from being rolled up. Therefore, it is possible to further suppress the collected target foreign matter P from flowing out of the collection chamber 31.

  This invention is not limited to each form mentioned above, It can implement with a various form. For example, the internal combustion engine in which the present invention is incorporated is not limited to a diesel engine, and may be applied to various internal combustion engines using gasoline or other fuels. The passage in which the foreign matter removing device of the present invention is provided is not limited to the EGR passage. You may provide in the various channel | paths through which the exhaust_gas | exhaustion with which an internal combustion engine is equipped, such as an exhaust channel distribute | circulates.

  The flow path cross-sectional area A of the rising portion 36 in the second form or the third form may be a predetermined cross-sectional area α or less. Even in this case, it is possible to suppress the target foreign matter P from being wound up by the fins 40 provided on the bottom surface 31 a of the collection chamber 31, and thus it is possible to suppress the collected target foreign matter P from flowing out of the collection chamber 31.

  Moreover, in the 2nd form or the 3rd form, you may each install the wire ball as a collection member which rounded the wire wire in each space S formed in the collection chamber 31, and was made into ball shape. . The wire ball has a variation in the density of the wire wire in each part, and the wire wire is rounded so as to form a plurality of spaces that are open to the outside and into which the target foreign matter P can be taken. What is necessary is just to set the density of the wire wire in each part of a wire ball suitably according to the magnitude | size of the target foreign material P, or the flow velocity of the gas flow in the space S. For example, if the density of the wire line is too coarse with respect to the size of the target foreign matter P, the captured target foreign matter P is easily removed. On the other hand, if the density of the wire is too dense, the target foreign matter P cannot be taken into the space. Further, in the space S, the flow velocity of the gas flow directed upward is increased toward the upper side. Since the terminal velocity V of the target foreign matter P increases as the diameter of the target foreign matter P increases, the target foreign matter P having a larger diameter can be collected above the space S. For this reason, for example, a wire ball is provided with a portion having a coarse density and a dense portion of the wire wire, and this wire is arranged so that the portion having a low density is disposed above the space S and the portion having a dense density is disposed below the space S. A ball may be installed in the space S. By installing the wire ball in this way, the foreign matter collecting ability of the wire ball can be improved, and the foreign matter collecting efficiency can be improved.

The figure which shows the outline of the internal combustion engine in which the foreign material removal apparatus which concerns on the 1st form of this invention was integrated. The figure which expands and shows the inside of the collection chamber of a foreign material removal apparatus. The figure for demonstrating the setting method of the flow-path cross-sectional area of a raise part. The figure which shows the principal part of the foreign material removal apparatus which concerns on the 2nd form of this invention. The figure which shows the principal part of the foreign material removal apparatus which concerns on the 3rd form of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 17 Low pressure EGR passage 30 Foreign material removal device 31 Collection chamber 31a Bottom surface 32 Inlet 33 Outlet 34 Baffle plate (wall part)
35 descending part 36 ascending part 40 fin (plate member)
A Flow path cross-sectional area of the ascending portion α Predetermined cross-sectional area where the flow velocity of the exhaust air and the terminal velocity of the target foreign matter are the same in the rising portion P Target foreign matter V Terminal velocity

Claims (4)

The exhaust gas provided in the internal combustion engine for collecting foreign matter in the exhaust gas is provided in a passage through which the exhaust gas flows, and each has an inlet and an outlet arranged at a position higher than the bottom surface. With a collection chamber discharged from the outlet,
The collection chamber is disposed downstream of the descending part and the descending part where the exhaust gas flowing in from the inlet descends toward the bottom surface, and the exhaust gas rises from the bottom side toward the outlet. A wall portion is provided so that a rising portion flowing into the collection chamber is formed inside the collection chamber,
In the wall portion, the flow path cross-sectional area of the rising portion balances the gravity acting on the target foreign matter to be collected in the collection chamber and the upward force applied to the target foreign matter by the exhaust gas flowing through the rising portion. A foreign matter removing apparatus for an internal combustion engine, wherein the foreign matter removing device is arranged to have a predetermined cross-sectional area that is equal to a terminal velocity of the target foreign matter that is a speed at a time and a flow velocity of exhaust gas that flows through the rising portion.   2. The foreign matter removing apparatus for an internal combustion engine according to claim 1, wherein the bottom surface is provided with a plurality of plate members extending upward from the bottom surface and extending in a direction intersecting with an exhaust flow direction in the collection chamber. The exhaust gas provided in the internal combustion engine for collecting foreign matter in the exhaust gas is provided in a passage through which the exhaust gas flows, and each has an inlet and an outlet arranged at a position higher than the bottom surface. With a collection chamber discharged from the outlet,
The collection chamber is disposed downstream of the descending portion and the descending portion where the exhaust gas flowing in from the inlet flows downward toward the bottom surface so that the exhaust gas rises from the bottom surface side toward the outlet. A wall portion is provided so that a rising portion flowing into the collection chamber is formed inside the collection chamber,
An apparatus for removing foreign matter from an internal combustion engine, wherein a plurality of plate members are provided on the bottom surface so as to extend upward from the bottom surface and extend in a direction intersecting with a flow direction of exhaust gas in the collection chamber.   4. The foreign matter removing apparatus for an internal combustion engine according to claim 2, wherein the plurality of plate members extend upward from the bottom surface so as to incline toward an upstream side in an exhaust flow direction in the collection chamber.

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