JP2020051314A - Blow-by gas recirculation device - Google Patents

Abstract

To provide a blow-by gas recirculation device capable of preventing/suppressing the generation of dew condensation and freezing.SOLUTION: A blow-by gas recirculation device 100 includes a blow-by gas passage 30, an ejector 42 provided in the blow-by gas passage 30, a compressed gas passage 50 connected to the ejector 42, and collision equipment 60 provided in the blow-by gas passage 30 on the downstream side further than a compressed gas joint part 55 for separating water vapor from blow-by gas joined with compressed gas, the collision equipment 60 having a collision part 62 for making the blow-by gas collide, the blow-by gas passage 30 from the downstream end of the ejector 42 to the collision part 62 being formed in a linear shape.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a blow-by gas recirculation device.

  2. Description of the Related Art In an internal combustion engine, a blow-by gas recirculation device (PCV) for recirculating blow-by gas leaked into a crankcase from a gap between a piston and a cylinder to a suction passage through a blow-by gas passage is known.

JP 2011-052627 A JP 2009-180149 A JP-A-10-026012

  By the way, in the blow-by gas recirculation device, it is conceivable that the blow-by gas is sucked from inside the engine body using the ejector effect.

  However, in a low-temperature environment, there is a possibility that the low-temperature pressurized gas is combined with the blow-by gas and the steam in the blow-by gas is cooled. In this case, dew condensation may occur in the blow-by gas passage or the like, and condensed water generated by the dew condensation may be frozen.

  Therefore, the present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a blow-by gas recirculation device that can prevent or suppress the occurrence of condensation and freezing.

According to one aspect of the present disclosure,
A blow-by gas passage for returning blow-by gas generated in the engine body to the intake passage;
An ejector provided in the blow-by gas passage;
A pressurized gas passage connected to supply pressurized gas to the ejector;
A blower provided in the blow-by gas passage downstream of the pressurized gas junction where the blow-by gas passage and the pressurized gas passage are connected, and a collision device for separating steam from the blow-by gas merged with the pressurized gas,
The collider has a collision section for colliding blow-by gas,
A blow-by gas recirculation device is provided, wherein a blow-by gas passage from a downstream end of the ejector to the collision portion is formed in a straight line.

  Preferably, the blow-by gas passage from the downstream end of the ejector to the collision portion has a constant cross-sectional shape and cross-sectional area.

  Preferably, the impactor includes a pipe portion having one end connected to the ejector and the other end opened, the pipe portion being formed to extend linearly, and the collision portion being formed at the other end of the pipe portion. Is arranged in close proximity.

  Preferably, the inner peripheral surface of the pipe portion and the inner peripheral surface of the ejector are smoothly connected.

  Preferably, the collider further includes a gas ejection hole formed on a wall surface of the pipe portion, and an impact plate for colliding gas ejected from the gas ejection hole.

  Preferably, an oil separating portion for separating oil from blow-by gas is provided in the blow-by gas passage upstream of the ejector.

  Preferably, a turbocharger compressor is provided in the intake passage, and the pressurized gas passage takes out pressurized gas from the intake passage downstream of the compressor.

  Preferably, an intercooler is connected to an intake passage downstream of the compressor, and the pressurized gas passage is a high-temperature side passage whose upstream end is connected to the intake passage upstream of the intercooler, A low-temperature side passage whose upstream end is connected to the intake passage on the downstream side of the intercooler, a junction where an upstream end is connected to the downstream end of the high-temperature side passage and the downstream end of the low-temperature side passage, An adjusting unit for adjusting the temperature of the pressurized gas flowing through the merging unit.

  According to the above aspect, the occurrence of dew condensation and freezing can be prevented or suppressed.

1 is an overall configuration diagram of an internal combustion engine according to an embodiment of the present disclosure. It is a side sectional view of an oil separator and an impactor.

  Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Note that the present disclosure is not limited to the embodiments below.

  FIG. 1 is an overall configuration diagram of an internal combustion engine 1 including a blow-by gas recirculation device 100. In the figure, a white arrow A indicates a flow of intake or pressurized gas, a shaded arrow B indicates a flow of blow-by gas, and a black arrow G indicates a flow of exhaust gas. Note that the directions of up, down, front, rear, left, and right shown in the drawings are merely defined for convenience of explanation.

  As shown in FIG. 1, the internal combustion engine 1 is a multi-cylinder compression ignition type internal combustion engine mounted on a vehicle (not shown), that is, a diesel engine. The vehicle is a large vehicle such as a truck. However, there is no particular limitation on the types, types, uses, and the like of the vehicle and the internal combustion engine 1. For example, the vehicle may be a small vehicle such as a passenger car, or the internal combustion engine 1 may be a spark ignition type internal combustion engine, that is, a gasoline engine. Is also good.

  The internal combustion engine 1 includes an intake passage 10, a compressor 20C of a turbocharger 20 provided in the intake passage 10, and an intercooler 21 provided in the intake passage 10 downstream of the compressor 20C.

  Specifically, the internal combustion engine 1 includes an engine body 2 and an intake passage 10 and an exhaust passage 11 connected to the engine body 2. Although not shown, the engine body 2 includes structural parts such as a cylinder head, a cylinder block, and a crankcase, and movable parts such as a piston, a crankshaft, and a valve housed therein. Reference numeral 3 denotes a head cover connected to the upper part of the cylinder head.

  The intake passage 10 is mainly defined by an intake manifold 12 connected to the engine body 2 (particularly, a cylinder head) and an intake pipe 13 connected to an upstream end of the intake manifold 12. The intake manifold 12 distributes and supplies the intake air sent from the intake pipe 13 to the intake port of each cylinder. The intake pipe 13 is provided with an air cleaner 14, a compressor 20C of the turbocharger 20, and an intercooler 21 in this order from the upstream side.

  The exhaust passage 11 is mainly defined by an exhaust manifold 15 connected to the engine body 2 (particularly, the cylinder head) and an exhaust pipe 16 arranged downstream of the exhaust manifold 15. The exhaust manifold 15 collects the exhaust gas sent from the exhaust port of each cylinder. A turbine 20 </ b> T of the turbocharger 20 is provided between the exhaust manifold 15 and the exhaust pipe 16.

  The blow-by gas recirculation device 100 includes a blow-by gas passage 30 for recirculating blow-by gas in the intake passage 10 upstream of the compressor 20C. As is well known, blow-by gas is gas that leaks into the crankcase from the gap between the cylinder and the piston in the engine body 2.

  Further, the blow-by gas recirculation device 100 includes an oil separator 40 provided in the blow-by gas passage 30 to separate oil from the blow-by gas using the pressurized gas generated by the compressor 20C. Further, the blow-by gas recirculation device 100 includes a pressurized gas passage 50 for taking out pressurized gas from the intake pipe 13 downstream of the compressor 20C and introducing it to the oil separator 40.

  The blow-by gas passage 30 includes a gas passage 31 on the engine body side that extends from the inside of the crankcase through the cylinder block and the cylinder head into the head cover 3, and a blow-by gas that is disposed downstream of the gas passage 31 and exposed to the outside. Mainly defined by the gas pipe 32. The downstream end of the blow-by gas pipe 32 is connected to the intake pipe 13 located between the air cleaner 14 and the compressor 20C.

  The oil separator 40 is provided between the gas passage 31 on the engine body 2 side and the blow-by gas pipe 32.

  FIG. 2 is a longitudinal sectional view illustrating a schematic configuration of the oil separator 40 and the collider 60. Symbol O indicates oil separated from blow-by gas. Symbol W indicates condensed water generated by condensation of moisture in the blow-by gas.

  As shown in FIG. 2, the oil separator 40 is installed above the head cover 3. In the upper part of the head cover 3, a gas outlet 31a of a gas passage 31 on the engine body side is formed.

  The oil separator 40 includes an oil separator 41 that introduces blow-by gas from the gas outlet 31a of the gas passage 31 and separates oil O from the blow-by gas. The oil separator 40 includes an ejector 42 for introducing a pressurized gas generated by the compressor 20C to generate a negative pressure. The ejector 42 sucks the blow-by gas after the oil O is separated by the oil separating unit 41 by the negative pressure.

  The oil separating section 41 includes a lower casing 44 connected to the upper surface of the head cover 3, an upper casing 45 connected to the upper surface of the lower casing 44, a gas injection member 46, and an outlet casing 47.

  The lower casing 44 is connected to the gas passage 31 on the engine body side and the gas injection member 46. The lower casing 44 is provided with an oil outlet 48 for discharging the oil O collected at the bottom in the outlet casing 47. A discharge valve 49 described later is attached to the oil outlet 48.

  The upper casing 45 covers and accommodates the gas injection member 46 from above. At the lower end position of the rear surface of the upper casing 45, a discharge port 45a for discharging the blow-by gas and oil O after oil separation into the outlet casing 47 is formed.

  The gas injection member 46 is formed in a vertically extending cylindrical shape, and a lid 46a is connected to an upper end portion. The gas injection member 46 has a plurality of through holes 46b extending in the radial direction.

  The outlet casing 47 is formed in a gutter shape extending in the up-down direction, and covers the discharge port 45a from behind, and is airtightly connected to the rear surface of the upper casing 45. At the upper end of the outlet casing 47, a gas outlet 41a of the oil separating section 41 is formed.

  The discharge valve 49 is configured to be closed by the urging force of a spring (not shown) and to be opened against the urging force of the spring by the load of accumulated oil O.

  The ejector 42 is formed in a tubular shape extending in the front-rear direction, and is supported on an upper casing 45. The ejector 42 includes a nozzle 42a, a diffuser 42b, and a connection pipe 42c. The nozzle 42a is formed at the front end (upstream end) of the ejector 42. The downstream end of a merging pipe 53 of a pressurized gas passage 50 described later is connected to the nozzle 42a. The diffuser 42b and the connection pipe 42c are formed at the rear (downstream) of the ejector 42. The diffuser 42b is configured by a pipe whose diameter is increased in a tapered shape toward the downstream. The connection pipe portion 42c is connected to the downstream end of the diffuser 42b and extends linearly rearward. The flow path cross section of the connection pipe portion 42c is formed in the same shape and the same cross sectional area from the front end to the rear end. A collision device 60 described later is connected to the connection pipe portion 42c.

  In addition, a gas outlet 41a of the oil separating portion 41 is opened on the lower surface of the diffuser 42b perpendicularly to the pipe axis. That is, the pressurized gas junction 55 where the blow-by gas passage 30 and the pressurized gas passage 50 are connected is formed in the diffuser 42b.

  The ejector 42 is not limited to the one described above. The ejector 42 may be of another type as long as it can suck blow-by gas from the engine body 2 side. That is, the ejector 42 in the present embodiment refers to a general device that sucks blow-by gas from the engine body 2 using negative pressure formed by injection of pressurized gas and merges the blow-by gas with the pressurized gas. .

  As shown in FIG. 1, the pressurized gas passage 50 includes a high-temperature side pipe 51 having an upstream end connected to the intake pipe 13 on the upstream side of the intercooler 21. Further, the pressurized gas passage 50 includes a low-temperature side pipe 52 as a low-temperature side passage whose upstream end is connected to the intake pipe 13 downstream of the intercooler 21. Further, the pressurized gas passage 50 includes a junction pipe 53 as a junction where the downstream end of the high temperature side pipe 51 and the downstream end of the low temperature side pipe 52 are connected at the upstream end. In addition, the pressurized gas passage 50 includes a thermostat 54 as an adjusting unit for adjusting the temperature of the pressurized gas flowing through the merging pipe 53.

  The thermostat 54 includes a valve body 54 a that opens and closes the low-temperature side pipe 52, and a heat-sensitive portion 54 b disposed toward the high-temperature side pipe 51. The heat sensing part 54b detects the temperature of the pressurized gas near the junction of the high temperature side pipe 51, the low temperature side pipe 52, and the junction pipe 53, and opens and closes the valve body 54a according to the detected temperature. Note that a wax pellet or the like that expands and contracts according to the temperature of the pressurized gas is used for the heat-sensitive portion 54b.

  The thermostat 54 of the present embodiment is provided on the low-temperature side pipe 52, and is opened when the temperature near the junction of the high-temperature side pipe 51, the low-temperature side pipe 52, and the junction pipe 53 detected by the heat-sensitive portion 54b is equal to or higher than the threshold Ts. The valve is configured to be closed when it is less than the threshold value Ts.

  The threshold value Ts of the temperature of the pressurized gas is set to the lowest temperature at which the oil contained in the blow-by gas causes the caulking abnormality of the compressor 20C by introducing the pressurized gas into the oil separator 40 and raising the temperature of the blow-by gas. Is set.

  That is, the temperature detected by the heat-sensing section 54b is usually lower than the threshold value Ts. At this time, the thermostat 54 closes and closes the low-temperature side pipe 52. Therefore, the pressurized gas is supplied to the oil separator 40 through the high temperature side pipe 51 and the junction pipe 53. On the other hand, when the temperature of the pressurized gas introduced into the high temperature side pipe 51 becomes high and becomes equal to or higher than the threshold value Ts, the thermostat 54 opens to open the low temperature side pipe 52. Accordingly, the relatively low-temperature pressurized gas introduced into the low-temperature side pipe 52 is mixed with the relatively high-temperature pressurized gas introduced into the high-temperature side pipe 51, and is supplied to the oil separator 40 through the merge pipe 53. The temperature of the pressurized gas is reduced. Thereby, it is possible to suppress the occurrence of the caulking abnormality in the compressor 20C due to the oil mixed into the blow-by gas without being completely separated by the oil separator 40. Here, the caulking abnormality refers to an abnormality in which the oil in the intake air that has been compressed and heated by the compressor is denatured into a liquid having a relatively high viscosity and adheres to a sliding portion or the like in the compressor.

  The pressurized gas passage 50 is not limited to the one described above, as long as it can supply the pressurized gas to the ejector 42. For example, the thermostat 54 may not be provided on the low temperature side pipe 52 but may be provided on the high temperature side pipe 51. Further, the pressurized gas passage 50 may not include the low temperature side pipe 52 and the thermostat 54. Further, the pressurized gas passage 50 may not include the high temperature side pipe 51 and the thermostat 54. Further, the pressurized gas passage 50 may supply a pressurized gas to the ejector 42 from a separately provided pump, accumulator, or the like.

  As shown in FIG. 2, the collision device 60 includes a pipe portion 61 having one end connected to the ejector 42 and the other end opened, and a collision portion 62 for causing blow-by gas discharged from the pipe portion 61 to collide.

  The pipe part 61 is formed in a straight line. Further, the other end of the pipe portion 61 is formed in an obliquely cut shape. A tip opening 61a formed at the other end of the pipe portion 61 is directed obliquely downward. The flow path cross section of the pipe portion 61 is formed in a circular shape and has the same shape and the same cross sectional area from one end to the other end. Further, the flow path cross section of the pipe portion 61 is formed in the same shape and the same cross sectional area as the connection pipe portion 42c. The inner peripheral surface of the pipe portion 61 is smoothly connected to the inner peripheral surface of the connection pipe portion 42c without any steps.

  The collision portion 62 is formed on a casing 63 that covers the pipe portion 61. Specifically, the casing 63 covers an outer cylindrical portion 64 provided on the outer circumference of one end of the pipe portion 61 and a portion other than the outer circumference of the one end portion of the pipe portion 61 which is formed integrally with the outer cylindrical portion 64 at intervals. And a surrounding portion 65.

  The collision portion 62 is formed in the surrounding portion 65 at a position facing the distal end opening 61 a of the pipe portion 61. That is, the collision section 62 is disposed on the pipe axis of the pipe section 61. Further, the collision section 62 is arranged close to the pipe section 61.

  The upstream end of a drain passage 68 is connected to the bottom 65 a of the surrounding portion 65 via a drain valve 69. The drain valve 69 is configured to be closed by the urging force of a spring (not shown) and to be opened against the urging force of the spring by the load of the condensed water W accumulated in the casing 63. The downstream end of the drain passage 68 is connected to the lower casing 44. The downstream end of the drain passage may be open to the atmosphere or may be connected to a tank (not shown).

  The bottom 65 a of the casing 63 is inclined so as to guide the condensed water W to the drain passage 68. Specifically, the drain passage 68 is connected to the center of the casing 63 in the front-rear direction, and the bottom 65a is inclined such that the center in the front-rear direction is lowest.

  Further, a gas discharge portion 70 is formed in an upper portion of the casing 63. The gas discharge part 70 is formed in a tubular shape. The downstream end of the gas discharge unit 70 is connected to the upstream end of the blow-by gas pipe 32 (see FIG. 1).

  Further, the collider 60 further includes a gas ejection hole 66 formed on a wall surface of the pipe portion 61 and a collision plate 67 for colliding gas ejected from the gas ejection hole 66.

  A plurality of gas ejection holes 66 are formed at a lower portion of the pipe portion 61 at intervals in the front-rear direction. Further, the gas ejection holes 66 are formed so as to penetrate the wall surface of the pipe portion 61 in the vertical direction.

  The collision plate 67 is provided on the pipe section 61. The collision plate 67 is provided obliquely intersecting with the pipe portion 61 such that the lower end portion is disposed on an extension of the gas ejection hole 66. The collision plate 67 is provided in the pipe portion 61 behind the gas ejection hole 66, and makes a lower end portion project diagonally forward. Specifically, the collision plate 67 is formed with an elliptical hole 67a through which the pipe portion 61 is inserted. The angle of the collision plate 67 with respect to the front-rear direction (the pipe axis direction of the pipe portion 61) is determined by bringing the inner peripheral surface of the hole 67a into contact with the outer peripheral surface of the pipe portion 61 over the entire circumference. For example, the collision plate 67 is welded to the pipe portion 61.

  The collision plate 67 is not limited to the above. The collision plate 67 only needs to be located on an extension of the gas ejection hole 66, and need not be provided in the pipe portion 61. For example, the collision plate 67 may be provided on the casing 63.

  Next, the operation and effect of the blow-by gas recirculation device 100 according to the present embodiment will be described.

  As indicated by the arrow B in FIG. 1, during operation of the internal combustion engine 1, blow-by gas in the crankcase flows through the gas passage 31, the oil separator 40, the collider 60, and the blow-by gas pipe 32 in order in the engine body. Is returned to the intake pipe 13.

  The blow-by gas recirculated to the intake pipe 13 is introduced into the compressor 20C together with the intake air from the air cleaner 14. In the compressor 20C, the intake air including the blow-by gas is compressed to generate a pressurized gas. The pressurized gas is cooled by the intercooler 21 and introduced into the combustion chamber of the engine body 2.

  The pressurized gas is introduced from the intake pipe 13 to the ejector 42 through the pressurized gas passage 50 (the high-temperature side pipe 51, the low-temperature side pipe 52, and the junction pipe 53). The temperature of the pressurized gas flowing through the merging pipe 53 is adjusted by the thermostat 54 so as not to be excessively high.

  The pressurized gas introduced into the ejector 42 is injected from the nozzle 42a to form a negative pressure region downstream of the nozzle 42a, and sucks blow-by gas on the engine body 2 side. At this time, the blow-by gas passes through the oil separating section 41 and then joins with the pressurized gas in the ejector 42. The oil O separated from the blow-by gas by the oil separating unit 41 is discharged from the oil outlet 48 into the lower casing 44 when the discharge valve 49 is opened, and returned to the inside of the crankcase through a return pipe (not shown).

  When the outside air temperature is, for example, a low temperature environment of several tens of degrees below the freezing point, the thermostat 54 is closed, and only the pressurized gas from the intake passage 10 on the upstream side of the intercooler 21 is ejected through the high-temperature side pipe 51 and the junction pipe 53. 42. However, when the outside air temperature is several tens of degrees below freezing, the pressurized gas may also be below freezing. The blow-by gas sucked into the ejector 42 has a higher temperature than the pressurized gas and contains steam. For this reason, the blow-by gas joined with the pressurized gas by the ejector 42 is cooled, and is easily condensed.

  However, the blow-by gas passage 30 from the downstream end of the diffuser 42b to the collision portion 62, that is, the flow passage of the connecting pipe portion 42c and the pipe portion 61 is formed linearly. Then, the cross-sections of the flow passages of the connecting pipe portion 42c and the pipe portion 61 are formed to have a constant shape and a constant cross-sectional area. Therefore, there is no passage resistance in the connection pipe portion 42c and the pipe portion 61, and the blow-by gas quickly passes through the connection pipe portion 42c and the pipe portion 61. For this reason, the occurrence of dew condensation and freezing in the connection pipe portion 42c and the pipe portion 61 is suppressed.

  The blow-by gas that has passed through the pipe portion 61 collides with the collision portion 62 and generates dew condensation. The condensed water W generated by the dew condensation at the collision portion 62 flows downward along the inner wall of the surrounding portion 65, and flows to the lower casing 44 via the drain valve 69 and the drain passage 68. At this time, the collision part 62 is formed in the surrounding part 65 separated from the pipe part 61. For this reason, even if the condensed water W generated by the condensation freezes, the blow-by gas passage 30 is prevented or suppressed from being blocked.

  Further, the other end of the pipe portion 61 is formed in an obliquely cut shape. For this reason, the front end opening 61a of the pipe portion 61 is wider than the flow passage area of a cross section of the pipe portion 61 cut perpendicularly to the pipe axis. For this reason, even if dew condensation and freezing occur in tip opening 61a, closure of tip opening 61a can be controlled.

  Further, a part of the blow-by gas flowing through the pipe portion 61 is ejected from the gas ejection holes 66 and collides with the collision plate 67. As a result, dew condensation occurs on the collision plate 67. The condensed water W generated by the dew condensation on the collision plate 67 flows down on the surface of the collision plate 67, then falls to the bottom 65a of the surrounding portion 65, and flows to the lower casing 44 via the drain valve 69 and the drain passage 68. At this time, dew condensation occurs on the collision plate 67 located below the pipe portion 61. For this reason, even if the condensed water W generated by the condensation freezes, the blow-by gas passage 30 is prevented or suppressed from being blocked.

  As described above, the embodiments of the present disclosure have been described in detail. However, the embodiments of the present disclosure are not limited to the above-described embodiments, and all the modifications and applications included in the concept of the present disclosure defined by the appended claims. Examples and equivalents are included in the present disclosure. Therefore, the present disclosure should not be construed as limiting, and can be applied to any other technology belonging to the scope of the idea of the present disclosure.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Engine main body 3 Head cover 10 Intake passage 11 Exhaust passage 12 Intake manifold 13 Intake pipe 14 Air cleaner 15 Exhaust manifold 16 Exhaust pipe 20 Turbocharger 20C Compressor 20T Turbine 21 Intercooler 30 Blow-by gas passage 31 Gas passage 31a Gas outlet 32 Blow-by Gas pipe 40 Oil separator 41 Oil separator 41a Gas outlet 42 Ejector 42a Nozzle 42b Diffuser 43 Connection pipe 44 Lower casing 45 Upper casing 45a Discharge port 46 Gas injection member 46a Cover 46b Through hole 47 Exit part casing 48 Oil outlet 49 Discharge valve Reference Signs List 50 pressurized gas passage 51 high temperature side pipe 52 low temperature side pipe 53 merge pipe 54 thermostat 54a valve body 54b heat sensitive part 55 pressurized gas merge part 60 collider 61 pie Part 61a Tip opening 62 Collision part 63 Casing 64 Outer cylinder part 65 Surrounding part 65a Bottom part 66 Gas ejection hole 67 Collision plate 67a Hole 68 Drain passage 69 Drain valve 70 Gas discharge part 100 Blow-by gas recirculation device A Open arrow B Shaded arrow G Arrow O Oil W Condensate

Claims (8)

A blow-by gas passage for returning blow-by gas generated in the engine body to the intake passage;
An ejector provided in the blow-by gas passage;
A pressurized gas passage connected to supply pressurized gas to the ejector;
A blower provided in the blow-by gas passage downstream of the pressurized gas junction where the blow-by gas passage and the pressurized gas passage are connected, and a collision device for separating steam from the blow-by gas merged with the pressurized gas,
The collider has a collision section for colliding blow-by gas,
A blow-by gas recirculation device, wherein a blow-by gas passage from a downstream end of the ejector to the collision portion is formed in a straight line. 2. The blow-by gas recirculation device according to claim 1, wherein the blow-by gas passage from the downstream end of the ejector to the collision section has a constant flow passage cross-sectional shape and cross-sectional area. 3. The collider includes a pipe portion having one end connected to the ejector and the other end opened.
The pipe portion is formed to extend linearly,
The blow-by gas recirculation device according to claim 1, wherein the collision portion is arranged near the other end of the pipe portion. The blow-by gas recirculation device according to claim 3, wherein an inner peripheral surface of the pipe portion and an inner peripheral surface of the ejector are smoothly connected. The collider is
Gas ejection holes formed on the wall surface of the pipe portion,
5. The blow-by gas recirculation device according to claim 3, further comprising: a collision plate configured to collide gas ejected from the gas ejection holes. 6. The blow-by gas recirculation device according to any one of claims 1 to 5, wherein an oil separation unit that separates oil from the blow-by gas is provided in the blow-by gas passage upstream of the ejector. In the intake passage, a turbocharger compressor is provided,
The blow-by gas recirculation device according to any one of claims 1 to 6, wherein the pressurized gas passage takes out a pressurized gas from the intake passage downstream of the compressor. An intercooler is connected to an intake passage downstream of the compressor,
The pressurized gas passage,
A high-temperature side passage whose upstream end is connected to the intake passage on the upstream side of the intercooler,
A low-temperature side passage whose upstream end is connected to the intake passage downstream of the intercooler,
A junction where an upstream end is connected to a downstream end of the high temperature side passage and a downstream end of the low temperature side passage,
The blow-by gas recirculation device according to claim 7, further comprising: an adjustment unit configured to adjust a temperature of the pressurized gas flowing through the junction.

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