JP2018013089A - EGR device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an EGR device capable of suitably collecting condensation water generated in an EGR system passage.SOLUTION: An EGR device includes: a turbocharger 2 for driving a turbine 2b by using exhaust gas 9 and pressurizing intake air 4 by a compressor 2a rotating together with the turbine 2b; and an EGR system passage (low pressure loop) 13 that extracts part of the exhaust gas 9 from an exhaust pipe 11 downstream of the turbine 2b and supplies the extracted exhaust gas to an intake pipe 5 upstream of the compressor 2a as EGR gas 9a. In the middle of a pipe constituting the intake pipe 5 located on the downstream side of a merging point between the EGR system passage (low pressure loop) 13 and the intake pie 5 and on the upstream side of the compressor 2a, a condensation water separation device having a casing through which the intake air 4 is caused to flow from the pipe to the downstream side and a partition plate 22 that forms a surface opposing to the pipe on the inlet side in the casing is disposed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an EGR device that can separate condensed water generated from cooling of EGR gas from EGR gas.

  Conventionally, in an automobile engine or the like, by extracting a part of the exhaust from the exhaust side and returning it to the intake side, by suppressing the combustion of fuel in the engine with the exhaust returned to the intake side and lowering the combustion temperature So-called exhaust gas recirculation (EGR) is performed to reduce the generation of NOx (nitrogen oxide) (see, for example, Patent Document 1 below).

  Normally, in the case of an EGR device that performs this type of exhaust gas recirculation, an EGR pipe is used between an appropriate position of the system path from the exhaust manifold to the exhaust pipe and an appropriate position of the system path from the intake pipe to the intake manifold. Connected to recirculate exhaust through the EGR pipe.

  At this time, if the exhaust gas (EGR gas) recirculated to the engine is cooled in the middle, the temperature of the exhaust gas decreases and the volume of the exhaust gas decreases, thereby effectively reducing the combustion temperature without significantly reducing the engine output. Since the generation of NOx can be reduced, a shell-and-tube type EGR cooler that cools EGR gas by dry heat exchange with cooling water is provided in the middle of a system that recirculates exhaust gas to the engine. It is common.

  That is, if the EGR gas is cooled by such an EGR cooler, the temperature of the exhaust itself is lowered, the volume is reduced, the density is increased, and the charging efficiency into the combustion chamber of the engine is increased. In this way, more exhaust can be introduced without significantly affecting the output of the engine.

JP 2012-112367 A

  In such an EGR device, condensed water may be generated as a result of cooling the EGR gas and the intake air containing the EGR gas by an EGR cooler or an intercooler. Since the condensed water contains a sulfur component derived from fuel, if it stays in the EGR system passage or the intake system passage, it may cause corrosion of engine parts.

  In particular, in the case of an EGR device that includes a turbocharger in the intake system and that recirculates the EGR gas on the low pressure side, the EGR gas that circulates downstream of the turbine of the turbocharger is upstream of the compressor of the turbocharger. To reflux. The EGR gas is cooled by an EGR cooler installed in the middle of the EGR pipe, and further cooled by being mixed with the intake air at the junction with the intake air. Here, when condensed water is generated in the EGR gas, the condensed water flows into the compressor immediately after that, and there is a risk of corroding the blades of the compressor.

  In recent years, exhaust gas regulations have become more and more strict, and it is considered necessary to further enhance the cooling capacity of EGR coolers and realize the introduction of larger amounts of EGR gas than before. If improved, it is assumed that condensed water is more likely to be generated in the EGR system path.

  In view of such circumstances, the present invention intends to provide an EGR device capable of suitably collecting condensed water generated in an EGR system path.

  The present invention includes a turbocharger that drives a turbine by exhaust and pressurizes intake air by a compressor that rotates together with the turbine, and extracts a part of the exhaust from an exhaust pipe downstream from the turbine to an intake pipe upstream from the compressor. An EGR device having an EGR system that supplies EGR gas, wherein the pipe is formed in the middle of a pipe that forms an intake pipe downstream of the merging point of the EGR system and the intake pipe and upstream of the compressor. An EGR device comprising: a casing for flowing the intake air from the interior downstream; and a condensate separator having a partition plate that forms a surface facing the pipe on the inlet side inside the casing It depends on.

  Thus, even if the EGR gas is mixed with the intake air at the junction of the EGR passage and the intake pipe to increase the relative humidity or the condensed water is generated, the intake air is supplied to the partition plate in the casing. Condensate is collected while colliding and bypassing it.

  Further, the flow path length is increased by the amount of the intake air that detours the partition plate toward the outlet side pipe, and the secondary effect that the intake air is well mixed with the EGR gas and the temperature becomes uniform is obtained.

  In the EGR device of the present invention, the partition plate forms a surface facing the inlet-side pipe and bypasses the intake air passing through the casing, and the non-capturing not facing the inlet-side pipe. It is preferable to be able to switch between the collection positions. In this way, when the EGR system path is not used, the partition plate is set to the non-collection position, and the exhaust gas is regenerated using the EGR system path. Only when the circulation is executed, the partition plate can be set to the collection position.

  In concrete implementation of the EGR device of the present invention, the partition plate is supported by a shaft stretched inside the casing, and rotates around the shaft so that a collection position and a non-collection position are provided. It can be configured to be switchable between.

  In concrete implementation of the EGR device of the present invention, the partition plate can be configured to be switchable between a collection position and a non-collection position by sliding the inside of the casing.

  According to the EGR device of the present invention, the following various excellent effects can be obtained.

  (I) According to the invention described in claim 1 of the present invention, the condensed water generated in the EGR system path is suitably collected by causing the intake air flowing into the casing to collide with the partition plate and bypass it. be able to.

  (II) According to the invention described in claims 2 to 4 of the present invention, the pressure caused by the partition plate being set at the non-collection position and the intake air colliding with the partition plate while the exhaust gas is not recirculated by the EGR system passage. Increase in loss can be avoided.

It is the schematic which shows the whole 1st Example of this invention. It is a front sectional view showing the main part of the first embodiment of the present invention. It is a front sectional view showing a main part of a second embodiment of the present invention. It is sectional drawing which shows the principal part of the 3rd Example of this invention, (A) is a front sectional view, (B) is a plane sectional view (IVB-IVB arrow equivalent view of (A)). It is sectional drawing which shows the principal part of 4th Example of this invention, (A) is a front sectional view, (B) is a side sectional view (VB-VB arrow equivalent view of (A)). It is front sectional drawing which shows the principal part of 5th Example of this invention, (A) shows the state which has a partition plate in a collection position, (B) shows the state which has a partition plate in a non-collection position, respectively.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 and 2 show an example (first embodiment) of an EGR apparatus according to an embodiment of the present invention. In the figure, reference numeral 1 denotes an engine equipped with a turbocharger 2, and intake air 4 guided from an air cleaner 3 is sent to a compressor 2 a of the turbocharger 2 through an intake pipe 5 and pressurized by the compressor 2 a. 4 is sent to the intercooler 6 to be cooled, and the intake air 4 is further guided from the intercooler 6 to the intake manifold 7 to each cylinder 8 of the engine 1 (FIG. 1 illustrates the case of in-line four cylinders). The exhaust 9 discharged from each cylinder 8 of the engine 1 is sent to the turbine 2b of the turbocharger 2 through the exhaust manifold 10, and drives the turbine 2b together with the compressor 2a. After being rotated, it is sent out to the exhaust pipe 11.

  The exhaust manifold 10 and the intake pipe 5 in the vicinity of the inlet of the intake manifold 7 are connected by a high-pressure loop (EGR system path) 12, and a part of the exhaust 9 from the exhaust manifold 10 is EGR gas via the high-pressure loop 12. It is extracted as 9a and can be recirculated to the intake pipe 5 near the inlet of the intake manifold 7.

  The exhaust pipe 11 downstream of the turbine 2b of the turbocharger 2 and the intake pipe 5 upstream of the compressor 2a of the turbocharger 2 are connected by a low-pressure loop (EGR system path) 13, and the low-pressure loop 13, a part of the exhaust gas 9 is extracted as EGR gas 9 a from the exhaust pipe 11 downstream of the turbine 2 b of the turbocharger 2 and can be recirculated to the intake pipe 5 upstream of the compressor 2 a of the turbocharger 2. is there.

  In the high-pressure loop 12 and the low-pressure loop 13, the EGR valves 14 and 15 whose opening degree can be adjusted so that the amount of recirculation of the exhaust gas 9 can be adjusted appropriately, and the recirculated EGR gas 9 a are exchanged with the cooling water EGR coolers 16 and 17 for cooling are respectively provided.

  Thus, in the engine 1 of the present embodiment, the high pressure loop 12 and the low pressure loop 13 are used in combination as an EGR system path connecting the exhaust side and the intake side of the engine 1. In the high-pressure loop 12, the EGR gas 9 a is recirculated using the pressure difference between the exhaust side and the intake side of the engine 1. Therefore, when the pressure difference is small, EGR in the low-pressure loop 13 is used together. In this way, when the EGR gas 9a having a relatively low exhaust temperature is recirculated and cooled by using the low-pressure loop 13 together, a large amount of condensed water is generated in the EGR cooler 17 of the low-pressure loop 13. There are concerns that will be generated. Further, at the junction of the low pressure loop 13 and the intake pipe 5, the EGR gas 9a is mixed with the intake air and the temperature is greatly lowered, so that condensed water is easily generated here.

  Therefore, in the present embodiment, the condensed water generated by the mixing of the EGR gas 9a and the intake air is disposed downstream of the junction of the low pressure loop (EGR system path) 13 and the intake pipe 5 and upstream of the compressor 2a. A condensate separator 18 for separating and collecting is installed to prevent the condensate from flowing into the compressor 2a immediately after.

  The condensate separation device 18 communicates with the pipe 19 in the middle of the pipe 19 forming the intake pipe 5 and passes the intake 4 from the pipe 19 into the downstream as shown in FIG. And a casing 20 that flows to the bottom. The casing 20 is connected to the inlet-side and outlet-side pipes 19 at positions closer to the upper side thereof, and is horizontally stretched in the casing 20 in a direction orthogonal to the direction of the inlet-side pipes 19. A shaft 21 and a partition plate 22 that is rotatably supported around the shaft 21 are provided. A drain pipe 24 having a drain valve 23 and a water level sensor 25 are provided at the lower part of the casing 20, and the water level sensor 25 detects the water level of the condensed water stored in the casing 20, and the water has accumulated in the casing 20. Condensed water can be drained from the drain pipe 24 as necessary.

  The shaft 21 extends in a position near the middle of the inlet-side pipe 19 and the outlet-side pipe 19 in the internal space of the casing 20, and the height is lower than the inlet-side and outlet-side pipe 19. . The partition plate 22 is supported along the shaft 21, a collection position (indicated by a solid line) that forms a surface facing the inlet-side pipe 19 around the shaft 21, and the inlet-side pipe 19 It can rotate between non-collecting positions (indicated by phantom lines) that do not face each other and form a plane parallel to the pipe 19.

  The partition plate 22 closes the upper side of the internal space of the casing 20 while forming a vertical surface facing the pipe 19 on the inlet side at the collection position, and opens the lower side of the internal space. When the partition plate 22 is in this position, the intake air 4 passing through the casing 20 flows into the pipe 19 on the upstream side as shown by a solid line in FIG. The partition plate 22 is detoured from below and heads for the outlet side pipe 19.

  On the other hand, in the non-collecting position, the partition plate 22 does not face the inlet-side pipe 19 and forms a surface along the flow of the intake air 4 flowing into the casing 20, so that the flow of the intake air 4 passing through the casing 20 Will not interfere. When the partition plate 22 is in this position, as indicated by the phantom line in FIG. 2, the intake air 4 does not bypass the inside of the casing 20 and flows linearly from the inlet side pipe 19 to the outlet side pipe 19.

  The switching of the position of the partition plate 22 is controlled by an open / close signal 22a from the control device 26 (see FIG. 1). The control device 26 executes or stops exhaust gas recirculation in each EGR loop (the high pressure loop 12 and the low pressure loop 13) according to the operation state, the target EGR amount, the EGR amount ratio between the high pressure loop 12 and the low pressure loop 13, and the like. And the opening degree of the EGR valves 14 and 15 is operated via the opening degree signals 14a and 15a. The operation of the partition plate 22 via the opening / closing signal 22a is performed by the low pressure loop 13. The exhaust gas recirculation is executed based on whether or not exhaust gas recirculation is executed.

  Further, the water level detected by the water level sensor 25 is input to the control device 26 as a water level signal 25a. A drainage signal 23a is input to the drain valve 23 in response to the water level signal 25a. Is appropriately opened to drain the condensed water from the drain pipe 24.

  Next, the operation of the first embodiment will be described.

  During the operation of the engine 1, the control device 26 determines the target EGR amount and the like in each of the high-pressure loop 12 and the low-pressure loop 13 according to the operation state, and adjusts the opening degree of the EGR valves 14, 15 to adjust the high pressure. The EGR amount in the loop 12 and the low pressure loop 13 is managed (see FIG. 1). As in the first embodiment, in the EGR device having the high-pressure loop 12 and the low-pressure loop 13 as the EGR system path, the high-pressure loop 12 and the low-pressure loop 13 are used for the high-pressure loop 12 and the low-pressure loop 13 depending on the operating conditions. There may be cases where exhaust gas recirculation is executed only by the loop 12 (that is, when the low pressure loop 13 is not used) and exhaust gas recirculation is executed only by the low pressure loop 13. Here, when the low pressure loop 13 is not used, as shown by the phantom line in FIG. 2, the partition plate 22 of the condensed water separator 18 is set to the non-collecting position, and the exhaust gas recirculation is executed using the low pressure loop 13. Only in this case, as shown by the solid line in FIG.

  That is, while exhaust gas recirculation by the low pressure loop 13 is not performed, the EGR gas 9a from the low pressure loop 13 is not mixed with the intake air 4, and condensed water is not generated at the junction of the low pressure loop 13 and the intake pipe 5. Therefore, there is no need to collect condensed water here. Therefore, at this time, if the partition plate 22 is set to the non-collection position, an increase in pressure loss due to the intake air 4 colliding with the partition plate 22 can be avoided.

  Here, as described above, in the first embodiment, the stretched height of the shaft 21 is set lower than the pipe 19 on the inlet side and the outlet side, and the partition plate 22 is supported along the shaft 21. Therefore, when the partition plate 22 is in the non-collecting position, the shaft 21 and the partition plate 22 are located outside the flow path connecting the inlet-side pipe 19 and the outlet-side pipe 19. Therefore, when the partition plate 22 is in the non-collecting position, an increase in pressure loss due to the shaft 21 and the partition plate 22 can be avoided.

  On the other hand, when exhaust gas recirculation is performed by the low-pressure loop 13, the EGR gas 9a from the low-pressure loop 13 is mixed with the intake air 4 so that the temperature decreases, the relative humidity increases, and the system path before flowing into the compressor 2a. Condensed water may be generated inside. Therefore, at this time, the partition plate 22 is set to the collection position, and the intake air 4 mixed with the EGR gas 9a is caused to collide with the partition plate 22 to bypass the inside of the casing 20. The intake air 4 that has flowed into the casing 20 from the pipe 19 on the inlet side first collides with the partition plate 22, then flows downward and collides with the bottom surface 20 a of the casing 20 (or the surface of the condensed water staying at the bottom of the casing 20). Next, it flows sideways while bypassing the lower end of the partition plate 22, collides with the side surface 20b of the casing 20, flows further upward, collides with the upper surface 20c of the casing 20, and flows out to the pipe 19 on the outlet side. . While the intake air 4 bypasses the partition plate 22 in the casing 20 as described above, the intake air 4 collides with the partition plate 22, the bottom surface 20 a, the side surface 20 b, and the top surface 20 c, and changes its direction. The condensed water adheres to and is collected on the partition plate 22, the bottom surface 20a, the side surface 20b, and the top surface 20c. Further, the saturated steam contained in the intake air 4 also becomes condensed water due to the collision, and similarly adheres to and is collected on each surface in the partition plate 22 and the casing 20. Thus, since saturated steam and condensed water are separated from the intake air 4 at a stage before flowing into the compressor 2a (see FIG. 1), there is no possibility that the compressor blades are damaged by the condensed water.

  Further, since the intake air 4 flowing in from the inlet-side pipe 19 goes to the outlet-side pipe 19 while bypassing the partition plate 22, the flow path length becomes longer than in the case where the intake air 4 does not bypass, and the intake air 4 becomes the EGR gas 9a. The additional effect that the temperature of the intake air 4 or the EGR gas 9a flowing into the compressor 2a becomes uniform is also obtained.

  The collected condensed water falls below the casing 20 by gravity and is stored here. When the water level of the stored condensed water reaches a predetermined threshold value, this is detected by the control device 26 as a water level signal 25a from the water level sensor 25. Next, the drain signal 23 a is input from the control device 26 to the drain valve 23, the drain valve 23 is opened, and the condensed water is discharged from the drain pipe 24.

  In the first embodiment, as described above, the partition plate 22 at the collection position closes the upper side of the internal space of the casing 20 and bypasses the intake air 4 downward. It is not necessary to take such a configuration. For example, the pipes 19 on the inlet side and the outlet side are connected to the lower side of the casing 20, and the partition plate 22 at the collection position forms a surface facing the pipe 19 on the inlet side below the casing 20, while lowering the inner space. Can be closed, and the intake 4 can be bypassed upward. Alternatively, the intake air 4 can be configured to detour in the left or right direction when viewed from the pipe 19 on the inlet side. However, since the collected condensed water is stored below the casing 20, the pipe 19 on the inlet side and the outlet side is connected to the upper part of the casing 20, as shown in the example shown here, and the partition located at the collecting position. Most preferably, the plate 22 is disposed so as to face the pipe 19 on the inlet side above the internal space of the casing 20. This is because the condensed water stored under the casing 20 is kept away from the outlet-side pipe 19 as much as possible, so that the condensed water does not flow into the outlet-side pipe 19 due to the flow of the intake air 4.

  Moreover, the partition plate 22 at the collection position does not necessarily need to completely close the upper side of the internal space of the casing 20. For example, the intake plate 4 can be placed on the upper side and the left and right sides of the partition plate 22 as viewed from the pipe 19 on the inlet side. A flow path that can be bypassed may be provided. It is sufficient that the intake air 4 flowing in the casing 20 collides with the partition plate 22 and bypasses this, so that a sufficient amount of condensed water can be separated, and the flow path configuration is the same as that shown in FIG. It is not limited.

  In the example shown here, the partition plate 22 is configured to have a vertical surface at the collection position and a horizontal surface at the non-collection position. However, the direction of the partition plate 22 is not necessarily vertical or horizontal. It is not necessary to. At the collection position, it is sufficient that the condensed water can be efficiently collected by colliding and detouring the intake air 4, and there is no problem even if it is configured to form an inclined surface with respect to the pipe 19 on the inlet side. Similarly, at the non-collecting position, the angle or the position should be such that the flow of the intake air 4 is not hindered as much as possible.

  As described above, the first embodiment includes the turbocharger 2 that drives the turbine 2b with the exhaust 9 and pressurizes the intake air 4 with the compressor 2a that rotates together with the turbine 2b, and the exhaust pipe downstream from the turbine 2b. The EGR system (low pressure loop) 13 and the intake air are provided with an EGR system (low pressure loop) 13 that extracts a part of the exhaust gas 9 from the exhaust gas 11 and supplies it as the EGR gas 9a to the intake pipe 5 upstream of the compressor 2a. A casing 20 that flows the intake air 4 from the pipe 19 downstream through the pipe 19 forming the intake pipe 5 downstream of the junction of the pipe 5 and upstream of the compressor 2a; A partition plate 22 that forms a surface facing the inlet-side pipe 19 is provided inside. For this reason, even if the EGR gas 9a is mixed with the intake air 4 at the junction of the EGR system path (low pressure loop) 13 and the intake pipe 5, the relative humidity increases, or even if condensed water is generated, the intake air 4 remains in the casing 20. Then, it collides with the partition plate 22 and condensate is collected while detouring.

  In addition, the flow path length is increased by the amount of the intake air 4 that detours the partition plate 22 toward the outlet side pipe 19, and the intake air 4 is well mixed with the EGR gas 9 a to make the temperature uniform. An effect is also obtained.

  In the first embodiment, the partition plate 22 forms a surface facing the inlet-side pipe 19 so as to detour the intake 4 passing through the casing 20, and faces the inlet-side pipe 19. Therefore, when the EGR system path (low pressure loop) 13 is not used, the partition plate 22 is set to the non-collection position, and the EGR system path (low pressure loop) 13 is used. Only when exhaust gas recirculation is performed using the partition plate 22, the partition plate 22 can be set to the collection position. In this way, it is possible to avoid an increase in pressure loss due to the intake air 4 colliding with the partition plate 22 while exhaust gas recirculation by the EGR system path (low pressure loop) 13 is not performed.

  In the first embodiment, the partition plate 22 is supported by a shaft 21 extending inside the casing 20, and rotates about the shaft 21 so that a gap between the collection position and the non-collection position is obtained. Since it is configured to be switchable, the partition plate 22 can be switched between the collection position and the non-collection position with a simple configuration.

  Therefore, according to the first embodiment, the condensed water generated in the EGR system path can be suitably collected.

  FIG. 3 shows another example (second embodiment) of the form of the EGR apparatus according to the embodiment of the present invention. In the second embodiment, a condensate separator (see FIG. 2) having a structure substantially similar to that of the first embodiment is installed at the same position (see FIG. 1) as in the first embodiment. Since the configuration of the water separation device is the same as that of the first embodiment, the following description will be made with reference to FIG. 1 as necessary (third to fifth embodiments described later). Will also be described with reference to FIG. 1 in some cases).

  In the condensate separator 27 employed in the second embodiment, the configuration including the drain valve 23, the drain pipe 24, and the water level sensor 25 below the casing 20 is the same as that in the first embodiment (see FIG. 2). However, the configuration of the shaft 28 and the partition plate 29 provided in the casing 20 is different from that of the first embodiment. Inside the casing 20, a plurality of shafts 28 are stretched in a horizontal direction perpendicular to the direction of the pipe 19 on the inlet side, and a partition plate 29 is rotatably supported on each of the plurality of shafts 28. . The shaft 28 and the partition plate 29 are arranged in the vertical direction, and are arranged in a siding plate shape as a whole.

  The plurality of partition plates 29 each have a collection position (indicated by a solid line) that forms a vertical surface facing the inlet-side pipe 19 around the shaft 28 and a horizontal plane parallel to the inlet-side pipe 19. When the exhaust gas recirculation is performed by the low-pressure loop 13 (see FIG. 1), the non-collecting position (indicated by phantom line) is supported. When exhaust gas recirculation is not executed, the position is switched to the non-collection position.

  Since the operation and effect of the second embodiment are the same as those of the first embodiment, a description thereof will be omitted.

  FIG. 4 shows still another example (third embodiment) of the form of the EGR apparatus according to the embodiment of the present invention. Also in the third embodiment, the condensate separation device is installed at the same position as the first embodiment (see FIG. 1).

  In the case of the third embodiment, the direction of the rotating shaft of the partition plate is different from the first and second embodiments. In the condensed water separator 30 employed in the third embodiment, a shaft 32 is provided in the casing 31 in a vertical direction perpendicular to the direction of the pipe 19 on the inlet side, and rotates about this shaft 32. Thus, the partition plate 33 is supported.

  As shown in FIG. 4A, the shaft 32 is provided so as to protrude from the upper surface of the casing 31 toward the internal space below. The partition plate 33 is supported in the vertical direction along the shaft 32, and as shown in FIG. 4B, a collecting position (indicated by a solid line) that forms a vertical surface facing the pipe 19 on the inlet side, and the inlet side It can be rotated around an axis 32 between a non-collecting position (indicated by a virtual line) that forms a vertical plane parallel to the pipe 19. When the exhaust gas recirculation by the low pressure loop 13 (see FIG. 1) is executed, the position of the partition plate 33 is set at the collection position. When the exhaust gas recirculation by the low pressure loop 13 is not executed, the position of the partition plate 33 is set at the non-collection position. It is configured to switch.

  In addition, although the thing of the substantially cylindrical shape was illustrated as the casing 31 in FIG.4 (B), the shape of the casing 31 is not restricted to this, For example, a rectangular parallelepiped shape may be sufficient. It is only necessary that the partition plate 33 has an internal space that can rotate between the collection position and the non-collection position.

  Moreover, although the case where the shaft 32 and the partition plate 33 are two sets is illustrated here, the number of the shafts 32 and the partition plates 33 is not limited to this, and may be one set. Three or more sets can be provided as in the second embodiment (see FIG. 3). However, as in the third embodiment, there are two shafts 32 and two partition plates 33 installed in the casing 31, and the two shafts 32 are flow paths from the inlet side pipe 19 to the outlet side pipe 19. Since the partition plate 33 and its shaft 32 at the non-collection position do not hinder the flow of the intake air 4 when viewed from the pipe 19 on the inlet side, An increase in pressure loss due to a certain shaft 32 or partition plate 33 can be prevented.

  The operational effects of the third embodiment are also the same as those of the first embodiment, and will not be described.

  FIG. 5 shows still another example (fourth embodiment) of the EGR apparatus according to the embodiment of the present invention. Also in the fourth embodiment, the condensate separation device is installed at the same position (see FIG. 1) as in the first embodiment.

  In the case of the fourth embodiment, the direction of the partition plate relative to the shaft is different from that of the first to third embodiments. In the condensate separation device 34 employed in the fourth embodiment, a shaft 36 is provided horizontally along the direction of the pipe 19 on the inlet side inside the casing 35 and is supported perpendicularly to the shaft 36. The partition plate 37 rotates around the shaft 36.

  As shown in FIGS. 5 (A) and 5 (B), in the condensed water separator 34 of the fourth embodiment, a semicircle is formed in a casing 35 that has a horizontal cylindrical shape along the direction of the inlet side and outlet side pipes 19. A partition plate 37 having a shape is accommodated, and an axis 36 that forms a rotation axis of the partition plate 37 coincides with a semicircular center axis of the partition plate 37 and a cylindrical center axis of the casing 35. Then, as shown in FIG. 5 (B), the partition plate 37 rotates around the shaft 36, and as shown in FIG. 5 (A), the upper collecting position (shown by a solid line) and the lower collecting position are displayed. It is possible to switch between the collection positions (indicated by virtual lines).

  That is, as shown in FIG. 5A, the inlet-side pipe 19 and the outlet-side pipe 19 are connected to the upper side of both end surfaces of the casing 35 having a sideways cylindrical shape, and the partition plate 37 has a shaft 36. On the other hand, when it is in the upper collecting position, it forms a surface opposite to the pipe 19 on the inlet side and collides with the inflowing intake air 4 to bypass the inside of the casing 35. On the other hand, when it is in the non-collecting position below the shaft 36, the flow path from the inlet side pipe 19 to the outlet side pipe 19 is not obstructed.

  The operational effects of the fourth embodiment are also the same as those of the first embodiment and will not be described.

  FIG. 6 shows still another example (fifth embodiment) of the form of the EGR apparatus according to the embodiment of the present invention. Also in the fifth embodiment, the condensate separation device is installed at the same position (see FIG. 1) as in the first embodiment.

  In the case of the fifth embodiment, unlike the first to fourth embodiments, the partition plate is not configured to rotate via a shaft. In the condensate separator 38 employed in the fifth embodiment, the partition plate 40 slides up and down inside the casing 39 so that it can be switched between the collection position and the non-collection position. Yes.

  That is, the partition plate 40 is disposed along the vertical direction in the casing 39 so as to form a surface orthogonal to the pipe 19 on the inlet side, and the ventilation plate 41 is opened above the partition plate 40. At the upper collection position, a surface facing the inlet-side pipe 19 is formed as shown in FIG. 6 (A) to divert the intake air downward, but at the lower non-collection position, 6 (B), the ventilation window 41 is opened at a position facing the pipe 19 on the inlet side, and the intake air 4 does not bypass from the pipe 19 on the inlet side to the pipe 19 on the outlet side through the ventilation window 41. It comes to flow.

  The operational effects of the fourth embodiment are also the same as those of the first embodiment and will not be described.

  It should be noted that the EGR apparatus of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

2 Turbocharger 2a Compressor 2b Turbine 4 Intake 5 Intake pipe 9 Exhaust 9a EGR gas 11 Exhaust pipe 13 EGR system path (low pressure loop)
18 Condensate Separator 19 Pipe 20 Casing 21 Shaft 22 Partition Plate 27 Condensate Separator 28 Shaft 29 Partition Plate 30 Condensate Separator 31 Casing 32 Shaft 33 Partition Plate 34 Condensate Separator 35 Casing 36 Shaft 37 Partition Plate 38 Condensation Water separator 39 Casing 40 Partition plate

Claims (4)

A turbocharger that drives a turbine by exhaust gas and pressurizes intake air by a compressor that rotates with the turbine is provided, and a part of the exhaust gas is extracted from an exhaust pipe downstream from the turbine and supplied as EGR gas to an intake pipe upstream from the compressor An EGR device equipped with an EGR system,
A casing for flowing the intake air from the pipe to the downstream in the middle of the pipe forming the intake pipe on the downstream side of the confluence of the EGR system path and the intake pipe and the upstream side of the compressor; An EGR apparatus comprising a condensate separator having a partition plate that forms a surface facing the pipe on the inlet side.   The partition plate switches between a collecting position that forms a surface facing the pipe on the inlet side and bypasses the intake air passing through the casing, and a non-collecting position that does not face the pipe on the inlet side. The EGR device according to claim 1, wherein the EGR device is configured to be possible.   The partition plate is supported by a shaft extending inside the casing, and is configured to be switchable between a collection position and a non-collection position by rotating around the shaft. The EGR device according to claim 2.   The EGR device according to claim 2, wherein the partition plate is configured to be able to switch between a collection position and a non-collection position by sliding the inside of the casing.

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