JP2011047358A - Blow-by gas treatment device in internal combustion engine with exhaust turbocharger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blow-by gas treatment device having an elbow pipe 14 provided in an intake passage from an air cleaner 11 to a blower compressor 8 and a blow-by gas inlet port 19 provided above an outlet pipe part 17 in the elbow pipe and preventing ice pillars from being formed in the outlet pipe part by condensed water in blow-by gas. <P>SOLUTION: The outlet pipe part 17 is provided in the inner face with a concave groove 20 extending in the axial direction and the inlet port is opened in the concave groove. The upstream end of the concave groove is formed to start from a portion of a bent pipe part beyond the inlet port or start from a portion of the inlet pipe part upstream of the bent pipe part. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an internal combustion engine equipped with an exhaust turbocharger, wherein blowby gas discharged from the internal combustion engine is sucked into a blower compressor of the exhaust turbocharger and processed. It is.

  In general, in an internal combustion engine equipped with an exhaust turbocharger, blow-by gas carried from the internal combustion engine is sucked into a blower compressor in the exhaust turbocharger and processed.

  In this case, in Patent Document 1 as a prior art, an elbow pipe is provided in the middle of an intake path from an air cleaner that takes in atmospheric air to a suction port in the blower compressor of the exhaust turbocharger. An outlet pipe section downstream from the bent pipe section is turned sideways, and a blow-by gas intake port is provided in a portion of the outlet pipe section above the axis so as to open into the outlet pipe section. The blow-by gas is introduced into the elbow pipe from the blow-by gas intake port.

Special table 2008-544142 gazette

  However, in this prior art, the blow-by gas intake port into the elbow pipe is opened in the direction toward the blower compressor.

  In this configuration, the blow-by gas introduced into the elbow pipe from the suction port can be smoothly put on the flow of the intake air in the elbow pipe. On the other hand, there were the following problems.

  That is, a part of the water contained in the blow-by gas becomes condensed water and enters the elbow pipe together with the blow-by gas.

  In this case, in the state of the warm-up operation immediately after starting the internal combustion engine, the flow rate of the intake air flowing through the elbow pipe is high even though there is much condensed water entering the elbow pipe together with the blow-by gas from the blow-by gas suction port. The condensate that has entered the elbow pipe together with the blow-by gas does not get on the flow of the intake air like the blow-by gas because it is slow due to the warm-up operation, and from the edge of the opening of the blow-by gas intake port. It becomes a state of dripping as water drops.

  Condensed water that drips in the form of water droplets freezes in an icicle shape when the temperature is low, such as in a cold region.

  This icicle is broken or chipped by vibration or the like, and is sucked into the blower compressor, so that there is a high risk of impeller damage in the blower compressor.

  Also, since the blow-by gas intake port protrudes into the elbow pipe, the blow-by gas intake port is cooled by being exposed to the intake air when the temperature is low, such as in a cold district, and the blow-by gas intake port is cooled. There is a possibility that condensed water freezes in the gas intake port and closes the opening of the port.

  The present invention has a technical problem to solve this problem.

In order to achieve this technical problem, claim 1
“In the middle of the intake path from the air cleaner to the blower compressor in the exhaust turbocharger, there is an elbow pipe that bends sideways toward the blower compressor. In the blow-by gas processing apparatus for an internal combustion engine, which is provided with an intake port for blow-by gas into the elbow pipe on the upper side of the outlet pipe portion,
A concave groove from the inner surface is provided on the inner surface of the outlet pipe portion of the elbow pipe so as to extend in the axial direction of the outlet pipe portion, and the suction port is opened in the concave groove. The one end of the recessed groove on the upstream side starts from the bent pipe portion of the elbow pipe beyond the suction port, or starts from the inlet pipe portion upstream of the bent pipe portion. Has been. "
It is characterized by that.

Claim 2
“In the first aspect of the present invention, the other end on the downstream side of the recessed groove is configured to end at the downstream portion beyond the suction port.”
It is characterized by that.

Claim 3
“In the first or second aspect of the present invention, at least one inner side surface of the left and right side surfaces of the recessed groove is provided with a protruding portion that blocks a part of the opening portion of the suction port. "
It is characterized by that.
Claim 4
“In the description of claim 3, the surface of the protrusion that faces the opening of the suction port is inclined so as to be separated from the opening toward the downstream of the opening of the recessed groove. . "
It is characterized by that.

  According to claim 1, when the intake air flowing toward the blower compressor in the elbow pipe is changed in the horizontal direction in the bent pipe portion of the elbow pipe, a part of the intake air is introduced into the concave groove, and the depression It flows in the length direction in the groove.

  In this case, one end on the upstream side of the recessed groove starts from the bent pipe part of the elbow pipe beyond the suction port or starts from the inlet pipe part upstream of the bent pipe part. Since intake air can be positively introduced into the recess groove, a strong flow of intake air can be formed in the recess groove even during the warm-up operation immediately after the start of the internal combustion engine.

  As a result, the blowby gas and the condensed water introduced into the elbow pipe from the opening of the suction port are immediately smoothly put on the strong flow of the intake air in the recessed groove, so that the mixability of the blowby gas into the intake air is increased. The condensate drops as water droplets from the edge of the opening, and when the air temperature is low such as in a cold region, an ice column is formed by the condensate. The occurrence of damage can be reliably reduced.

  According to a second aspect of the present invention, since the other downstream end of the recessed groove exceeds the suction port and ends at the downstream portion thereof, a strong flow of intake air in the recessed groove is caused by the suction port. Since the blow-by gas and the condensed water can be smoothly put on the flow of the intake air, the above-described effects can be promoted.

  According to a third aspect of the present invention, a part of the condensed water introduced into the elbow pipe through the opening of the suction port is received by the projection provided in the recessed groove, and flows from the blow-by gas extraction pipe. As the momentum of the water is reduced, the condensed water jumps out into the elbow pipe and adheres to the inner wall of the elbow pipe opposite to the opening of the suction port, where it is exposed to the intake air and forms ice blocks. Can be prevented. Further, a part of the condensed water introduced into the elbow pipe from the opening of the suction port can grow into a large water drop by being received by the surface on the opening side of the projection provided in the recessed groove. In this case, blow-by gas continues to blow into the condensed water received on the surface of the protrusion on the opening side. Since the blow-by gas has a relatively high temperature, the received condensed water does not form an ice block on the surface of the projection on the opening side.

  Moreover, the protrusion provided in the recessed groove is provided on at least one side of the left and right side surfaces of the recessed groove, in addition to accelerating the flow rate of the intake air in the vicinity of the opening in the recessed groove. Since the intake air flowing in the outlet pipe is prevented from entering the opening, it is more reliable that the three members can put condensed water on the flow of the intake air, and promote the above-mentioned effect. it can.

  Furthermore, according to claim 4, the condensed water received by the protrusion is sequentially removed downstream from the opening so as to flow downstream along the inclination of the protrusion. , The formation of ice columns due to the condensed water can be further reduced.

It is a figure which shows embodiment of this invention. It is a vertical front view of the elbow pipe for suction to the blower compressor of the exhaust turbocharger, and is a sectional view taken along the line II-II in FIG. FIG. 5 is a sectional view taken along line III-III in FIGS. 2 and 4. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. FIG. 5 is a sectional view taken along line VV in FIG. 3. FIG. 6 is a sectional view taken along line VI-VI in FIG. 3.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  In these drawings, reference numeral 1 denotes a multi-cylinder internal combustion engine, which is provided with an intake manifold 2 for each cylinder and an exhaust manifold 3 for each cylinder.

  In addition, a blow-by gas extraction line 5 from the collection portion 4 is connected to a blow-by gas collection portion 4 such as a cylinder head cover or a crankcase in the internal combustion engine 1.

  Reference numeral 6 denotes an exhaust turbocharger in which the exhaust turbine 7 and the blower compressor 8 are directly connected.

  Of the exhaust turbocharger 6, the exhaust manifold 3 is connected to an inlet of the exhaust turbine 7, and an exhaust pipe 9 to the atmosphere is connected to an outlet of the exhaust turbine 7.

  On the other hand, an intake pipe 12 from an air cleaner 11 is connected to the suction side 10 of the blower compressor 8 in the exhaust turbocharger 6 so as to take in atmospheric air, and the discharge port in the blower compressor 8 is supercharged. It is connected to the intake manifold 2 via a pipe line 13.

  An elbow pipe 14 configured to bend in the lateral direction from the downward direction toward the blower compressor 8 is provided in the middle portion of the intake pipe 12.

  The elbow pipe 14 is made of a light alloy such as aluminum, and includes a bent pipe part 15, an inlet pipe part 16 upstream from the bent pipe part 15, and an outlet pipe part 17 downstream from the bent pipe part 15. The outlet pipe portion 17 is detachably joined to the suction side 10 of the blower compressor 8 by flange joining, while the intake pipe 12 from the air cleaner 11 is connected to the inlet pipe portion 16. ing.

  In this case, the axis 16a in the inlet pipe 16 is laterally extended by a dimension E as appropriate from the center 17b in the outlet pipe 17 as seen from the direction of the axis 17a in the outlet pipe 17 as shown in FIG. By shifting (eccentric), the flow of the intake air is swirled in the direction indicated by arrow A in the outlet pipe portion 17, and the internal combustion engine is disposed on the outer periphery of the outlet pipe portion 17. A jacket 18 is provided integrally so as to warm a portion of the outlet pipe portion 17 and a portion of an opening portion 21 in a suction port 19 which will be described later by flowing a part of the cooling water to 1.

  The outlet port 17 of the elbow pipe 14 has a suction port 19 that opens into the outlet pipe 17 above the axis 17a, and an axis 19a of the suction port 19 as shown in FIG. A blow-by gas extraction conduit 5 from the internal combustion engine 1 is connected to the suction port 19 provided toward the center 17b of the outlet pipe portion 17 or the vicinity thereof.

  A concave groove 20 from the inner surface of the inner surface of the outlet pipe portion 17 of the elbow pipe 14 is provided in the portion of the suction port 19 so as to extend in the direction of the axis 17a of the outlet pipe portion 17, An opening 21 in the suction port 19 is located in the recessed groove 20.

  One end 22 on the upstream side of the recessed groove 20 exceeds the opening 21 of the suction port 19 and has a depth at the bent pipe portion 15 of the elbow pipe 14 as shown in FIG. On the other hand, the other end 23 on the downstream side of the recessed groove 20 exceeds the opening 21 of the suction port 19 in the downstream portion thereof as shown in FIG. In addition, as shown in FIGS. 4 and 5, the other end 23 has a groove shape extending in a direction along the swirl direction of the intake air. .

  In another embodiment, the other end 23 of the recessed groove 20 may be configured to end at the opening 21 as shown by a two-dot chain line 23 'in FIG.

  Further, of the left and right side surfaces 20a and 20b of the recessed groove 20, a part of the opening 21 in the suction port 19 is formed on one inner side surface 20b located on the downstream side with respect to the swirling flow indicated by the arrow A. A projecting portion 24 that is closed is provided integrally.

  The surface 24a on the opening 21 side of the projection 24 is perpendicular or substantially perpendicular to the axis 19a of the suction port 19 as shown in FIG. 3 when viewed from the direction of the axis 17a in the outlet pipe portion 17. When viewed from the direction perpendicular to the axis 19a of the suction port 19, as shown in FIG. 4, the suction port 19 is inclined obliquely downward toward the downstream by an angle θ, that is, away from the opening 21.

  In this configuration, when the intake air flowing toward the blower compressor 8 in the elbow pipe 14 is changed in the horizontal direction in the bent pipe portion 15 of the elbow pipe 14, a part of the intake air enters the recessed groove 20. It is introduced from the beginning of one end 22 and flows in the length direction of the recessed groove 20.

  In this case, one end 22 on the upstream side of the recessed groove 20 starts from the bent pipe portion 15 portion of the elbow pipe 14 beyond the suction port 19, and the intake air is positively introduced into the recessed groove 20. Since it can be introduced, a strong flow of intake air can be formed in the recessed groove 20 even during the warm-up operation immediately after the start of the internal combustion engine.

  The strong flow of the intake air in the recessed groove 20 ends with the downstream end of the recessed groove 20 beyond the intake port 19 at the downstream portion thereof. The blow-by gas and condensed water introduced into the elbow pipe 14 from the opening 21 of the suction port 19 are immediately and smoothly put on the strong flow of intake air in the recessed groove 20. It will be.

  A part of the condensed water introduced into the elbow pipe 14 from the opening 21 of the suction port 19 is received by the surface 24a on the opening 21 side of the projection 24 provided in the recessed groove 20. As a result, the momentum flowing from the blow-by gas extraction pipe 5 is reduced, so that the condensed water jumps into the elbow pipe 14 to the inner wall of the elbow pipe opposite to the opening 21 of the suction port 19. It adheres and can be prevented from being exposed to the intake air and becoming ice blocks. Further, a part of the condensed water introduced into the elbow pipe 14 from the opening 21 of the suction port 19 is received by the surface 24 a on the opening 21 side of the protrusion 24 provided in the recessed groove 20. Can grow into large droplets. In this case, blow-by gas continues to blow into the condensed water received by the surface 24a on the opening 21 side of the protrusion 24. Since the blow-by gas has a relatively high temperature, the received condensed water does not become an ice block on the surface 24a on the opening 21 side of the protrusion 24.

  In addition, the protrusion 24 accelerates the flow velocity of the intake air in the vicinity of the opening 21 in the recessed groove 20.

  Furthermore, the condensed water received by the surface 24a on the opening 21 side of the protrusion 24 is sequentially downstream from the opening 21 so that the surface flows downstream along the inclination in 24a. Will be eliminated.

  In the above-described embodiment, the upstream end 22 of the recessed groove 20 is configured to start at the bent tube portion 15. However, the present invention is not limited to this, and the upstream end 22 is not limited thereto. The upstream end 22 can be configured to start at the inlet pipe section 16 upstream from the bent pipe section 15, whereby more intake air can be introduced into the recessed groove 20.

  In the case of the illustrated embodiment, the back surface 24b of the protrusion 24 opposite to the opening 21 is viewed from the direction of the axis 17a of the outlet pipe portion 17, as shown in FIG. The inner surface of the outlet pipe portion 17 is inclined tangentially.

  As a result, the swirling flow indicated by the arrow A in the outlet pipe portion 17 can be guided so as not to enter the opening portion 21, and the generation of ice blocks in the opening portion 21 can be prevented.

  In another embodiment (not shown), by providing a protrusion on the inner side surface 20a on the upstream side with respect to the swirling flow indicated by the arrow A among the left and right inner side surfaces 20a, 20b of the recessed groove 20, It can be set as the structure which prevents the approach to the opening part 21 of a swirl flow more reliably.

  When the blow-by gas extraction conduit 5 is connected to the suction port 19, the blow-by gas extraction conduit 5 is curved in the direction opposite to the protrusion 24 as shown in FIG. The condensed water that flows while traveling along the inner surface of the blow-by gas extraction pipe 5 is collected so as to be directed toward the protrusion 24 due to the bending, so that the effect of the protrusion 24 can be promoted.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Intake manifold 3 Exhaust manifold 4 Blow-by gas gathering part 5 Blow-by gas extraction pipe 6 Exhaust turbocharger 8 Blower compressor 10 Blower compressor suction side 11 Air cleaner 12 Intake pipe 14 Elbow pipe 15 Elbow pipe Bent pipe section 16 Elbow pipe inlet pipe section 17 Elbow pipe outlet pipe section 19 Suction port 20 Recessed groove 21 Opening 22 One end of recessed groove 23 The other end of recessed groove 24 Projection

Claims (4)

An elbow pipe is provided in the intake path from the air cleaner to the blower compressor in the exhaust turbocharger so as to bend laterally toward the blower compressor. In the blow-by gas processing apparatus in an internal combustion engine, which is provided with an intake port for blow-by gas into the elbow pipe on the upper side of the pipe part,
A concave groove from the inner surface is provided on the inner surface of the outlet pipe portion of the elbow pipe so as to extend in the axial direction of the outlet pipe portion, and the suction port is opened in the concave groove. One end of the recessed groove on the upstream side starts from the bent pipe portion of the elbow pipe beyond the suction port, or starts from the inlet pipe portion upstream of the bent pipe portion. A blow-by gas processing apparatus for an internal combustion engine.   2. The blow-by gas processing apparatus for an internal combustion engine according to claim 1, wherein the other end of the recessed groove on the downstream side ends with the downstream portion beyond the suction port.   3. The projection according to claim 1 or 2, wherein one of the left and right side surfaces of the recessed groove is provided with a protrusion that blocks a part of the opening of the suction port. A blow-by gas processing apparatus for an internal combustion engine.   4. The surface of the projection portion facing the opening portion of the suction port is inclined so as to be separated from the opening portion toward the downstream side of the opening portion of the recessed groove. A blow-by gas processing apparatus for an internal combustion engine.

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