JP6120143B2 - Intercooler condensate drainage device for internal combustion engine - Google Patents

Description

  The present invention relates to an apparatus for discharging condensed water generated by an intercooler that cools intake air compressed by a turbocharger of an internal combustion engine and supplies the air to the internal combustion engine.

In general, a turbocharger such as a turbocharger using exhaust gas is frequently used to improve the output and fuel consumption of an internal combustion engine.
The turbocharger drives an exhaust turbine with exhaust gas flowing through an exhaust passage, and supercharges air with a compressor coaxially connected to the exhaust turbine to increase the output of the internal combustion engine.
Since the supercharged air has a low air density due to a temperature rise, an intercooler is arranged downstream of the compressor intake passage to cool the intake air to increase the air density. The output is improved.

The intake air compressed by the turbocharger is at high temperature and high pressure, and is cooled from this high temperature and high pressure state, and both the temperature and pressure drop, so the water contained in the intake air condenses and becomes liquid. . In particular, when the low-pressure loop EGR that recirculates the exhaust gas to the upstream side of the compressor is employed, the condensed water is easily generated.
Liquid condensate collects in the low part of the intercooler in the direction of gravity.
The accumulated condensate reduces the intake passage cross-sectional area and causes a decrease in the output of the internal combustion engine, engine stop, corrosion of the intake pipe due to acidic substances contained in the exhaust gas, and the like.
Furthermore, in a cold region, after the operation is completed in a state where condensed water is accumulated, the condensed water is frozen the next morning, and the intake pipe may be blocked.

As such a correspondence, Patent Document 1 is disclosed.
According to Patent Literature 1, a condensate water tank that stores condensed water provided below the intercooler, a communication pipe that connects the intercooler and the condensate water tank, and an open / close valve that opens and closes communication of the communication pipe; A drain pipe connected to the lower part of the condensate tank, and a water level sensor that detects the level of the condensate accumulated in the condensate tank, and an open / close valve that opens and closes based on the detection output of the water level sensor and a drain valve. The controller which performs the discharge operation of the condensed water appropriately and automatically according to the amount of the condensed water accumulated in the condensed water tank is provided.

JP 2011-241797 A

  However, according to Patent Document 1, the condensed water accumulated in the bottom of the intercooler is connected to the condensed water tank, the communication pipe, the water level sensor, the open / close valve disposed in the communication pipe, and the lower part of the condensed water tank. It has a drain pipe, a drain valve installed in the drain pipe, a controller for opening and closing these drain valves, and a controller for opening and closing the drain valve. There is a factor to increase.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide an intercooler condensed water discharge structure for an internal combustion engine that reliably discharges condensed water generated by cooling of intake air at a low cost. And

In order to achieve the above object, according to the present invention, there is provided a condensed water discharge structure for an intercooler provided in an intake passage downstream of a supercharger that supercharges intake air of an internal combustion engine,
The intake passage on the downstream side of the intercooler is provided with a bent portion that is inclined downward after being inclined downward in the direction of gravity,
A condensed water reservoir in which condensed water generated by cooling the moisture contained in the intake air by the intercooler is accumulated in the bent outer peripheral side of the bent shape portion and in an extended portion of the intake passage inclined downward in the gravitational direction. Set up a section,
A communication pipe communicating the condensed water reservoir and the intake passage at a position higher in the direction of gravity than the condensed water reservoir;
The communication pipe has an opening cross-sectional area of a jet outlet that opens to the intake passage and ejects the condensed water smaller than an opening cross-sectional area of an inlet that opens to the condensed water reservoir and introduces the condensed water. It is possible to provide a condensate drainage device for an intercooler characterized by this.

According to the present invention, the dynamic pressure from the supercharger acts on the inlet of the condensed water reservoir, and the pressure reducing action due to the intake air flow in the intake passage occurs at one of the outlets.
Therefore, the condensed water in the condensed water reservoir is ejected as droplets from the ejection port, mixed into the intake air in the intake passage, and guided into the cylinder of the internal combustion engine.
Therefore, corrosion of the intake pipe due to acidic substances contained in the condensed water, decrease in the output of the internal combustion engine due to increased flow resistance of the intake air in the intercooler due to freezing of the condensed water, internal combustion by water hammer due to large amount of condensed water in the intake air It is possible to prevent the engine from being damaged.

  In the present invention, it is preferable that the jet port is open to a venturi portion provided in the intake passage.

  With this configuration, the condensate jet port is opened in the venturi, so that the flow rate of the intake air is increased and the amount of pressure reduction at the jet port is increased, thereby making it easier to mix liquid droplets into the intake air. be able to.

Further, as a reference of the present invention, the jet outlet may be opened downstream of a throttle valve disposed in the intake passage.

  With such a configuration, by adjusting the opening and closing of the throttle valve, the amount and timing of the condensed water ejection can be set arbitrarily, and the output of the internal combustion engine can be adjusted.

  In the present invention, it is preferable that the jet port protrudes from the wall surface of the intake passage and discharges condensed water from the center of the intake passage.

  By adopting such a configuration, by opening the jet outlet in the main flow portion (center portion) where the flow of the intake air in the intake passage is fast, the amount of pressure reduction in the opening portion is increased, and the condensed water is more easily sucked out. At the same time, it can be easily mixed into the intake air.

Further, as a reference of the present invention , a cylindrical guide member that guides the flow of intake air may be provided at the center of the intake passage, and the jet port may be open inside the guide member.

  By having such a configuration, the intake port is rectified by opening the jet outlet in the main flow portion (center portion) of the intake passage and arranging the cylindrical guide member along the flow of intake air, It is possible to suppress the ejected condensed water from adhering to the wall surface of the intake passage.

Further, the present invention, the condensed water reservoir, said with intake hydrodynamic with the intercooler in the intake air flow in the intake passage downstream is disposed in the bent portion acting, the jets the condensed water reservoir characterized in that it is disposed in the intake passage downstream of the parts.

By adopting such a configuration, the intake dynamic pressure acts on the condensate pool portion disposed in the bent portion, so that the flow pressure of the intake air acts on the inlet, and the opening cross-sectional area is the opening cutoff of the inlet. A pressure reducing action due to the intake air flow is generated at the jet outlet smaller than the area.
Therefore, the condensed water in the intake passage is ejected in the form of droplets during intake, and the condensed water can be prevented from accumulating in the intake passage on the downstream side of the intercooler.

Further, as a reference of the present invention, the condensate pool may be formed inside the intercooler, and the jet outlet of the communication pipe may be provided near the outlet of the intercooler.

  With this configuration, the condensate reservoir is formed inside the intercooler, so there is no need to provide a separate condensate reservoir, and cost increases can be suppressed, and the device can be made compact and the vehicle can be made compact. The mountability of is improved.

  ADVANTAGE OF THE INVENTION According to this invention, the condensed water discharge structure of the intercooler which discharges the condensed water produced by cooling of intake air reliably at low cost can be provided.

The whole schematic block diagram in embodiment of this invention is shown. The schematic explanatory drawing which implemented the 1st reference form of the present invention in the intercooler is shown. The expanded sectional view of the A section of FIG. 2 is shown. (A) is a principal part expanded sectional view of the 2nd reference form of the present invention, (B) is a principal part expanded sectional view of the 3rd reference form of the present invention, and (C) is a principal part of the 4th reference form of the present invention. An enlarged sectional view is shown. (A) is a principal part expanded sectional view of 1st Embodiment of this invention, (B) shows the principal part expanded sectional view of 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to specific examples unless otherwise specifically described. Only.

( Overall structure )
FIG. 1 shows an overall schematic configuration diagram in an embodiment of the present invention.
As shown in FIG. 1, a diesel engine (hereinafter referred to as an engine) system 100 that is an internal combustion engine according to this embodiment includes exhaust gas discharged from a combustion chamber 13 via an engine 1 and an exhaust manifold 17 of the engine 1. , The exhaust gas that drives the turbocharger 9 is interposed in the exhaust pipe 71, the exhaust gas purification device 7 that purifies the exhaust gas, and the intercooler that cools the air supercharged by the turbocharger 9 2, a first intake pipe 3 that introduces air cooled by the intercooler 2 into the combustion chamber 13 of the engine 1, and a second intake pipe 8 that introduces air from an air cleaner 81 that removes outside air into the turbocharger 9. The high-pressure loop EGR6 disposed between the first intake pipe 3 and the exhaust manifold 17 and the exhaust pipe 71 are exhausted. A scan purifier 7 on the downstream side and the low-pressure loop EGR5 disposed between the second intake pipe 8, and a control unit ECU which controls the operation of the engine system 100 (not shown).
The combustion chamber 13 is a space formed by being surrounded by a cylinder 12 in the engine 1, a piston 11 that slides in the cylinder 12 in the axial direction of the cylinder 12, and a cylinder head 10 that closes the upper portion of the cylinder 12. is there.
Reference numeral 15 denotes a fuel injection valve. When the piston 11 reaches the vicinity of the compression top dead center, the fuel is injected from the fuel injection valve 15, ignited by the intake compression heat, and burned.

The turbocharger 9 is driven by exhaust gas discharged from the combustion chamber 13 of the engine 1 through the exhaust turbine of the turbocharger 9, and compresses air from the air cleaner 81 by a compressor disposed coaxially with the exhaust turbine. Since the temperature of the compressed air rises, it is cooled by the intercooler 2 to increase the air density, and is introduced into the combustion chamber 13 to improve the output of the engine 1.
An exhaust pipe 71 is connected to the exhaust turbine side of the turbocharger 9. An exhaust gas purification device 7 is interposed in the exhaust pipe 71. Inside the exhaust gas purification device 7, an oxidation catalyst 7a and a particulate filter 7b are arranged in this order from the upstream side of the exhaust gas flow path. The purified exhaust gas flows through the exhaust pipe 71 and is released to the atmosphere.

The high-pressure loop EGR6 disposed between the first intake pipe 3 and the exhaust manifold 17 adjusts the introduction amount of the exhaust gas cooled by the high-pressure side EGR cooler 61 and the high-pressure side EGR cooler 61 into the first intake pipe 3. The high pressure side EGR valve 62 to perform and the 2nd throttle valve 31 are provided.
Open / close control of the high pressure side EGR valve 62 and the second throttle valve 31 is performed by the control unit ECU.
The high-pressure loop EGR6 secures a necessary amount of EGR gas introduced into the combustion chamber 13 at a low load of the engine 1 and reduces the combustion temperature in the combustion chamber 13 by reducing the amount of oxygen, thereby generating NOx. It is what suppresses.
This is because the high-pressure side EGR cooler 61 increases the density of the exhaust gas introduced into the combustion chamber 13 by cooling the exhaust gas.

On the other hand, the low-pressure loop EGR5 disposed between the exhaust pipe 71 on the downstream side of the exhaust gas purification device 7 and the second intake pipe 8 is a low-pressure side EGR cooler 51 and the exhaust gas cooled by the low-pressure side EGR cooler 51 is second. A low pressure side EGR valve 52 that adjusts the amount of introduction into the intake pipe 8 and a first throttle valve 82 are provided.
Open / close control of the low pressure side EGR valve 52 and the first throttle valve 82 is performed by the control unit ECU.
When the engine 1 is at a high speed and a high load, the air pressure in the first intake pipe 3 becomes high, and the introduction of EGR gas into the first intake pipe 3 becomes insufficient.
The low pressure loop EGR 5 ensures the amount of EGR gas introduced into the combustion chamber 13 by mixing EGR gas into the compressor upstream side of the turbocharger 9 when the engine 1 is under high load and high rotation.
This is because the low-pressure side EGR cooler 51 increases the density of the exhaust gas introduced into the combustion chamber 13 by cooling the exhaust gas.

(First reference form)
Figure 2 shows a schematic outline diagram of the first reference embodiment was performed intercooler of the present invention.
2 shows the whole intercooler. In the intercooler 2, the intake air flows from the left side (upstream side) to the right side (downstream side) in FIG.
A second intake pipe 8 that introduces compressed air from the turbocharger 9 is connected to the upstream inlet 30 of the intercooler 2.
The downstream side outlet 21 of the intercooler 2 is connected to the first intake pipe 3 that introduces the compressed air cooled in the intercooler 2 into the combustion chamber 13.

The interior of the intercooler 2 is composed of a metal tube 2a having high thermal conductivity through which intake air flows through a thin cylindrical middle space, and fins 2b mounted on the outer peripheral surface of the tube 2a to cool the tube 2a. Has been.
The intake air pressurized by the turbocharger 9 is cooled by exchanging heat with the wall surface of the tube 2a while passing through the tube 2a. The tube 2a conducts heat to the fins 2b attached to the outer periphery, and the fins 2b are cooled by the outside air that contacts the fins 2b.
Reference numeral 22 denotes a communication pipe. The communication pipe 22 has one end connected to the lowermost part of the intercooler 2 which is a condensed water reservoir for collecting condensed water, and the other end connected to a downstream outlet 21 connected to the first intake pipe. It is an empty tube.

FIG. 3 is an enlarged cross-sectional view of a part A in FIG.
The communication pipe 22 has a first opening 22c that is an inlet opening at one end of the bottom space T that is the lowermost part of the outlet tank of the intercooler 2, which is a condensed water reservoir in which condensed water generated by cooling of intake air is accumulated. The first conduit 22 a and the other end are constituted by a second conduit 22 b having a second opening 22 d which is a jet opening opened to the downstream outlet 21.
The second opening 22d opens from the inner wall surface of the downstream outlet 21 to the top of the venturi 21a whose cross section in the intake passage direction protrudes in a mountain shape.
The second opening cross-sectional area S2 of the second opening 22d is smaller than the first opening cross-sectional area S1 of the first opening 22c.
The first opening cross-sectional area S1 has a small hole diameter so that the condensed water ejected becomes droplets. In the present embodiment, the best droplet state is obtained at 0.8 to 1.2 mm. I have confirmed.

When the engine 1 is operated and the turbocharger 9 is activated, the overpressured intake air passes through the venturi portion 21a at a higher flow velocity, lowers the intake pressure in the second opening portion 22d, and the second opening portion. Condensed water is sucked up from 22d.
On the other hand, the flow pressure of the intake air flowing through the intercooler 2 acts on the first opening 22c.
Further, since the cross-sectional area of the downstream outlet 21 is narrower than the cross-sectional area of the flow path in the outlet tank of the intercooler 2, the intake air flow velocity flowing through the downstream outlet 21 is increased, and the outlet tank of the intercooler 2 is increased. The pressure drops compared to the inside. (Bernoulli's Law)
Since the first opening cross-sectional area S1 of the first opening 22c is larger than the second opening cross-sectional area S2 of the second opening 22d, the condensed water ejected from the second opening 22d spouts vigorously.
The ejected condensed water is in the form of droplets, mixed into the intake air, and introduced into the combustion chamber 13.

With such a structure, the fluid pressure from the turbocharger 9 acts on the first opening 22c of the bottom part (condensate pool part T) of the intercooler 1, and the one second opening 22d A decompression action is caused by the venturi portion 21a.
Therefore, the condensed water at the bottom T is mixed in the form of droplets in the intake air in the intake passage from the second opening 22 d having a small cross-sectional area, and is introduced into the combustion chamber 13 of the engine 1.
Therefore, corrosion of the intercooler 2 and the first intake pipe 3 due to acidic substances contained in the condensed water, a decrease in engine output due to an increase in the flow resistance of the intake air in the intake system due to freezing of the condensed water, a large amount of condensed water in the intake air It is possible to prevent the engine from being damaged by water hammer due to the mixing.
Further, since the condensed water reservoir T is provided at the lowermost part of the intercooler 2, the entire apparatus as the condensed water discharge device becomes compact, and the mountability to the vehicle is improved.

(Second reference form)
Since this reference form is the same as the first reference form except that the shape of the downstream outlet of the intercooler 2 is different, the description other than the downstream outlet is omitted.
The same parts are denoted by the same reference numerals, and description thereof is omitted.
FIG. 4A shows a partial cross-sectional view of the downstream outlet 23 of the intercooler 2.
A throttle valve 29 is disposed at the downstream outlet 23. In the vicinity of the throttle valve 29 on the downstream side of the intake passage, a second opening 24 d of the second conduit 24 b of the communication pipe 24 is opened on the inner peripheral wall surface of the downstream outlet 23.
The throttle valve 29 is controlled to open and close by the control device ECU based on the operating conditions of the engine 1.
When the engine 1 is under high load and high speed, the throttle valve 29 opens the intake passage to increase the intake flow rate, and during low load operation, the throttle valve 29 is operated in the closing direction so that the second opening 24d portion Depressurization is caused.

  By adopting such a structure, the condensed water at the bottom (condensate pool T), which is the lowermost part of the intercooler 1, becomes droplets from the second opening 24d having a small cross-sectional area into the intake air of the intake passage. It is mixed and introduced into the combustion chamber 13 of the engine 1.

(3rd reference form)
Since this reference form is the same as the first reference form except that the shape of the downstream outlet of the intercooler 2 is different, the description other than the downstream outlet is omitted.
The same parts are denoted by the same reference numerals, and description thereof is omitted.
FIG. 4B shows a partial cross-sectional view of the downstream outlet 23 of the intercooler 2.
In the downstream outlet 23, an opening 25 d of the second conduit 25 b of the communication pipe 25 that guides condensed water to the intake passage extends from the inner peripheral wall surface of the downstream outlet 23 to the center of the intake passage.
In the central portion of the intake passage, the flow velocity of the intake air is faster than the vicinity of the inner peripheral wall surface of the downstream outlet 23, so the amount of decompression of the intake flow at the opening 25d increases, and the condensed water suction force from the opening 25d acts strongly. .
Furthermore, since the condensed water mixed in the intake air rides on the flow of the intake air, dispersion in the circumferential direction is difficult to occur, and an effect of suppressing the amount attached to the inner wall surface of the first intake pipe is obtained.

(4th reference form)
Since this reference form is the same as the third reference form except that the shape of the opening of the second conduit for guiding condensed water to the intake passage is different, the description other than the opening 25d of the second conduit 25 is omitted.
The same parts are denoted by the same reference numerals, and description thereof is omitted.
FIG. 4C shows a partial cross-sectional view of the downstream outlet 23 of the intercooler 2.
The opening 26d of the second conduit 26b of the communication pipe 26 that guides the condensed water to the intake passage is supported by the second conduit 26b at the center of the intake passage, and is a hollow cylindrical guide member 26f along the intake passage. Open in.
The intake air is rectified by the guide member 26f, and condensed water is mixed into the rectified intake flow in the form of droplets, so that an effect of effectively suppressing the amount adhering to the inner wall surface of the first intake pipe 3 can be obtained.
In FIG. 4C, the opening 26d is opened in the inner peripheral wall of the cylindrical guide member 26f. However, the opening 26d may be opened in the axial center portion of the cylindrical guide member 26f.

(First Embodiment)
If the first reference embodiment to the fourth reference embodiment has been described for the case of the upstream inlet 30 and the downstream outlet 21 Togaryaku horizontal intercooler 2. In the case of this embodiment, for convenience of vehicle-mounted layout, the downstream outlet 21 is inclined downward in the direction of gravity with respect to the upstream inlet 30 of the intercooler 2, and the condensed water reservoir is the first intake pipe 3. It is formed at the bottom of the gravitational direction.
Accordingly, since the configuration other than the outer shape of the intercooler 2 is the same as that of the first reference embodiment, the description of the portion other than the portion where the condensed water reservoir is formed in the first intake pipe 3 is omitted.

FIG. 5A shows a state in which the downstream outlet 23 of the intercooler 2 is inclined downward in the gravity direction, and the condensed water reservoir T is formed in the first intake pipe 3.
Since the intercooler 2 is inclined, the condensed water generated by cooling the intake air does not accumulate at the bottom of the intercooler 2 and flows out from the downstream outlet 23 to the first intake pipe 3 side.
The first intake pipe 3 is connected to the downstream outlet 23 of the intercooler 2 and has a bent shape that is inclined downward after being inclined downward in the direction of gravity.
The condensed water reservoir portion T is formed on the bent outer peripheral side (lowermost portion in the direction of gravity) of the inverted bent shape portion.
The condensed water flowing out from the intercooler 2 is stored at the bottom of the bent portion 3a bent upward of the first intake pipe 3.
A first opening portion 27c of the first conduit 27a of the communication pipe 27 is opened in the peripheral wall portion on the bent outer peripheral side of the bent portion 3a.
A second opening 27d of the second conduit 27b that is continuous with the first conduit 27a is opened in the downstream peripheral wall of the bent portion 3a.
The first conduit 27a forms a condensed water reservoir T that swells downward continuously from the first opening 27c that is largely open.
A second conduit 27b is formed continuously with the condensed water reservoir T.

Accordingly, the intake air flowing out from the downstream outlet 23 of the intercooler 2 collides with the condensed water in the first opening 27c.
The intake air that collides with the condensed water becomes turbulent and flows upward in the first intake pipe 3.
The condensed water in the condensed water reservoir T receives the flow pressure of the intake air on the first opening 27c side, and drops into the first intake pipe 3 by the suction action due to the turbulent flow of intake air on the second opening 27d side. And leaked.

( Second Embodiment)
Since this embodiment is the same as the first embodiment except that the condensed water reservoir shape and the shape of the communication pipe are different from each other, the description other than the condensed water reservoir shape and the shape of the communication pipe is omitted.
The same parts are denoted by the same reference numerals, and description thereof is omitted.
FIG. 5B shows a partial cross-sectional view of the downstream outlet 23 of the intercooler 2.

FIG. 5B shows a state in which the downstream outlet 23 of the intercooler 2 is inclined downward in the gravitational direction, and the condensed water reservoir T is formed at the lowermost portion of the first intake pipe 3 in the gravitational direction.
Since the intercooler 2 is inclined, the condensed water generated by cooling the intake air does not accumulate at the bottom of the intercooler 2 and flows out from the downstream outlet 23 to the first intake pipe 3 side.
The first intake pipe 3 is connected to the downstream outlet 23 of the intercooler 2 and has a bent shape that is inclined downward after being inclined downward in the direction of gravity.
The condensed water reservoir portion T is formed on the bent outer peripheral side (lowermost portion in the direction of gravity) of the inverted bent shape portion.
A third opening 3c into which condensed water flows is disposed at the bottom of the bent portion 3a on the lower side in the gravity direction.

A tank 3b, which is a condensed water reservoir T that stores condensed water that has passed through the third opening 3c, is disposed at the bottom of the bent portion 3a.
A communication pipe 28 that mixes the condensed water in the tank 3b into the intake air in the intake passage is disposed on the downstream side of the intake passage of the third opening 3c.
The communication pipe 28 opens the first opening 28c into the condensed water of the tank 3b, and the first conduit 28a protruding into the intake passage, and the condensed water is jetted into the intake passage continuously to the first conduit 28a. And a second conduit 28b having a second opening 28d.
The second conduit 28b is positioned in the vicinity of the axial center of the first intake pipe 3, extends along the intake air flowing through the first intake pipe 3, and discharges condensed water toward the downstream side of the intake air. Is open.
In the present embodiment, the communication pipe 28 is disposed at a separated position on the downstream side of the intake passage of the third opening 3c. However, for example, it is disposed on the downstream edge of the intake passage of the third opening 3c. Also good.

With such a structure, the intake air flowing out from the downstream outlet 23 of the intercooler 2 passes through the third opening 3c and collides with the condensed water stored in the tank 3b.
The intake air that collides with the condensed water becomes turbulent and flows upward in the first intake pipe 3.
Condensate tank 3b receives the flow pressure in the intake at the third opening 3 c side, the suction effect of the turbulence of the intake air in the second opening 2 8 d side, intake main portion of the first intake pipe 3 To leak.
In addition, the second conduit 28b is disposed along the flow of intake air in the intake mainstream portion, and opens the second opening 28d toward the downstream side of the intake passage, so that the condensed water suction effect is obtained. Further improve.

  The present invention can be used in an intake air cooling device that cools an intake air compressed by a turbocharger of an internal combustion engine by an intercooler and supplies the cooled air to the internal combustion engine.

1 engine (internal combustion engine)
2 Intercooler 3 First intake pipe (intake passage)
3a Bent part 3b Tank (condensate pool)
3c 3rd opening 5 Low pressure loop EGR
6 High pressure loop EGR
7 Exhaust gas purification device 8 Second intake pipe 9 Turbocharger 13 Combustion chamber 21, 23 Downstream outlet 21a Venturi section 22, 24, 25, 26, 27, 28 Communication pipe 22a, 27a, 28a First conduit 22b, 24b, 25b, 26b, 27b, 28b Second conduit 22c, 27c, 28c First opening 22d, 24d, 25d, 26b, 27d, 28d Second opening 25f Guide member S1 First opening cross-sectional area (opening cross-sectional area of introduction port) )
S2 Second opening cross-sectional area (opening cross-sectional area of the spout)
T Condensate reservoir

Claims (3)

A condensate drainage structure for an intercooler provided in an intake passage downstream of a supercharger that supercharges intake air of an internal combustion engine,
The intake passage on the downstream side of the intercooler is provided with a bent portion that is inclined downward after being inclined downward in the direction of gravity,
A condensed water reservoir in which condensed water generated by cooling the moisture contained in the intake air by the intercooler is accumulated in the bent outer peripheral side of the bent shape portion and in an extended portion of the intake passage inclined downward in the gravitational direction. Set up a section,
A communication pipe communicating the condensed water reservoir and the intake passage at a position higher in the direction of gravity than the condensed water reservoir;
The communication pipe has an opening cross-sectional area of a jet outlet that opens to the intake passage and ejects the condensed water smaller than an opening cross-sectional area of an inlet that opens to the condensed water reservoir and introduces the condensed water. An intercooler condensate drainage device characterized by that.   2. The intercooler condensate drainage device according to claim 1, wherein the jet port opens in a venturi portion provided in the intake passage. The condensed water discharge device for an intercooler according to claim 1 or 2 , wherein the jet port protrudes from a wall surface of the intake passage and discharges condensed water from a center of the intake passage.

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