JP6958097B2 - Intercooler drainage device - Google Patents

Description

The present invention relates to a drainage device for an intercooler, and more particularly to a drainage device for an intercooler that discharges condensed water generated when the intake air pressurized by a supercharger is cooled by the intercooler.

An engine equipped with a supercharger (turbocharger or the like) has an intercooler in the intake passage for cooling the intake air pressurized by the supercharger.

Further, when the intake air is cooled by the intercooler, the water is condensed to generate condensed water. If this condensed water accumulates inside the intercooler as it is, the intercooler may be corroded.

Therefore, an intercooler drainage device that satisfactorily controls the discharge of condensed water generated by the intercooler to the intake passage at an appropriate timing according to the operating state of the engine is already known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-140868

However, in such an intercooler drainage device disclosed in the prior art document, in order to control the discharge of condensed water at an appropriate timing according to the operating state of the engine, in addition to the normal intake system control, The discharge of condensed water had to be controlled, which caused a problem that the control system became more complicated.

In order to solve the above-mentioned problems, the technique of the present disclosure can satisfactorily discharge condensed water without performing complicated discharge control of condensed water using a dedicated detection sensor or control device. It is an object of the present invention to provide a drainage device for a cooler.

In order to achieve the above object, the techniques of the present disclosure are arranged in an intercooler arranged in an intake passage downstream of the supercharger that supercharges the intake air of the internal combustion engine and in an intake passage downstream of the intercooler. Condensation that discharges air containing condensed water generated by the intercooler to the intake passage by connecting the intake adjustment valve and the other end to the intake passage on the downstream side of the intake adjustment valve. The condensed water removal passage is provided with a water removal passage, and the exhaust passage cross-sectional area orthogonal to the discharge direction of air containing condensed water is narrowed with respect to the intake passage cross-sectional area orthogonal to the intake direction of the intake passage. An orifice narrower than the cross-sectional area of the discharge passage is provided at the end of the passage.

Further, the condensed water removal passage is provided by a drainage pipe having one end connected to the intercooler, a connection portion connecting the other end of the drainage pipe and the intake passage on the downstream side of the intake adjustment valve, and an orifice. It is preferable that it is defined.

In addition, the intake passage is provided with a common chamber whose diameter is larger than that of the intake passage between the intake adjustment valve and the intake manifold, and the condensed water removal passage is a drain pipe having one end connected to an intercooler and the other end of the drain pipe. It is preferable that the common chamber is connected to the common chamber and defined by a connecting portion in which an orifice is arranged.

Further, the drainage pipe is provided with a connection flow path that is horizontally connected to the connection portion at least at the other end, the connection portion is provided with a discharge flow path that is vertically connected downward to the upper surface of the common chamber, and the orifice is. It is preferable that it is horizontally connected to the end of the connection flow path and horizontally connected to the discharge flow path.

According to the technique of the present disclosure, it is possible to satisfactorily discharge the condensed water without performing complicated discharge control of the condensed water using a dedicated detection sensor or a control device.

It is explanatory drawing of the engine system which applied the drainage device of the intercooler which concerns on this embodiment. It is an enlarged sectional view of the main part of the drainage device of the intercooler which concerns on this embodiment.

Hereinafter, the drainage device for the intercooler according to the embodiment of the present invention will be described with reference to the accompanying drawings. The same parts are designated by the same reference numerals, and their names and functions are also the same. Therefore, detailed explanations about them will not be repeated.

Further, in the following description, each direction of front / rear / left / right / up / down will be described as being the same as front / rear / left / right / up / down as seen from the driver when the vehicle is traveling forward. Therefore, the left-right direction is synonymous with the vehicle width direction. However, the front-back, left-right, up-down directions do not always indicate the front-back, left-right, up-down directions in a strict sense. For example, the front-back and left-right directions are not always based on the horizontal plane, and the vertical directions are not always based on the vertical direction, and include cases where each direction is indicated in a functional sense.

As shown in FIG. 1, the engine (internal combustion engine) 1 is a diesel engine as a multi-cylinder compression ignition type internal combustion engine mounted on a vehicle. In the example shown in FIG. 1, an in-line 4-cylinder engine is used, but the cylinder arrangement type and the number of cylinders of the engine 1 are arbitrary.

The engine 1 includes an engine main body 2, an intake passage 3 and an exhaust passage 4 connected to the engine main body 2, a supercharger 5, and a fuel injection device 6. 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.

The fuel injection device 6 includes, for example, a common rail type fuel injection device, and includes an injector 7 as a fuel injection valve provided in each cylinder and a common rail 8 connected to the injector 7. The injector 7 injects fuel directly into the combustion chamber inside the cylinder 9. The common rail 8 stores the fuel injected from the injector 7 in a high pressure state.

The intake passage 3 is mainly defined by an intake manifold 10 connected to the engine body 2 (particularly, a cylinder head) and an intake pipe 11 connected to the upstream end of the intake manifold 10. The intake manifold 10 distributes and supplies the intake air sent from the intake pipe 11 to the intake ports of each cylinder.

The intake pipe 11 is provided with an air cleaner 12, a compressor 5C of the supercharger 5, an intercooler 13, an electronically controlled intake control valve 14, and a common chamber 15 in this order from the upstream side.

The exhaust system of the exhaust passage 4 is mainly defined by an exhaust manifold 20 connected to the engine body 2 (particularly, a cylinder head) and an exhaust pipe 21 arranged on the downstream side of the exhaust manifold 20. The exhaust manifold 20 collects the exhaust gas sent from the exhaust port of each cylinder.

A turbine 5T of the supercharger 5 is provided in the exhaust pipe 21 (or between the exhaust manifold 20 and the exhaust pipe 21). The exhaust pipe 21 is provided with various catalysts, sensors, and the like on the downstream side of the turbine 5T.

On the other hand, the engine 1 includes an EGR device 30. The EGR device 30 includes an EGR passage 31 for returning a part of the exhaust gas flowing inside the exhaust passage 4, particularly the exhaust manifold 20 (hereinafter, also referred to as “EGR gas”) to the intake passage 3, and an EGR passage. An EGR cooler 32 for cooling the EGR gas flowing through the 31 and an EGR valve 33 for adjusting the flow rate of the EGR gas are provided.

Further, although not shown, the engine 1 is provided with an electronic control unit (hereinafter, referred to as “ECU”) forming a control unit or a controller. This ECU includes various circuit components such as a central processing unit (CPU) and a semiconductor storage element (ROM, RAM), and controls an injector 7, an intake air regulating valve 14, an EGR valve 33, and the like.

In the ECU, for example, the fuel injection amount of the injector 7 and the intake adjusting valve 14 are based on detection signals from various sensors arranged in the intake system and the exhaust system (not shown), an engine rotation speed sensor, an accelerator opening sensor, and the like. Various controls related to engine drive including the opening degree of the engine are executed.

By the way, as described above, when the intake air is cooled by the intercooler 13, water is condensed to generate condensed water. If this condensed water accumulates inside the intercooler 13 as it is, the intercooler 13 may be corroded.

In particular, in the engine 1 in which the EGR device 30 is arranged, the temperature of the EGR gas supplied to the intake passage 3 by the exhaust gas recirculation is relatively high, and a relatively large amount of water is contained as water vapor.

Therefore, the EGR passage 31 of the EGR device 30 is connected to the intake passage 3 between the intake adjustment valve 14 and the common chamber 15. As a result, the water vapor generated in the EGR device 30 can be recovered by the common chamber 15.

The common chamber 15 improves the output by increasing the intake air filling efficiency by utilizing the inertia of the intake air flow of the intake passage 3, and also increases the amount of increase in the number of revolutions at the time of starting the engine 1 by the air remaining inside. Let me. The diameter of the common chamber 15 is expanded at least downward so that the moisture (condensed water) condensed inside does not flow to the downstream side. The common chamber 15 may allow the water to be drained to the atmosphere.

Further, the engine 1 in the present embodiment includes a condensed water removing passage 40 for discharging the condensed water generated when the intake air is cooled by the intercooler 13 described above.

The condensed water removal passage 40 is defined by a drainage pipe 41 having one end connected to the intercooler 13 and a connecting portion 42 connecting the other end of the drainage pipe 41 and the intake passage 3 on the downstream side of the intake adjustment valve 14. It is made.

As shown in FIG. 2, the connecting portion 42 includes a joint member 43 connected to the other end of the drainage pipe 41 extending in the horizontal direction with one end opened by an inlay method, and a bolt member 44 penetrating the joint member 43. A packing 45 located between the bolt member 44 and the outer periphery of the joint member 43 is provided.

The bolt member 44 fixes the drainage pipe 41 to the common chamber 15 by screwing the threaded portion 44a with the female screw hole 15b formed in the raised portion 15a that rises upward from the upper surface of the common chamber 15. As a result, the packing 45 seals between the joint member 43 and the bolt member 44 while being sandwiched between the head portion 44b of the bolt member 44 and the raised portion 15a.

The threaded portion 44a is formed with a discharge flow path 44c that opens to the tip along the axial direction and an orifice 44d that is orthogonal to the axial direction near the base portion that is close to the head portion 44b.

Therefore, the other end of the drainage pipe 41 is connected to the joint member 43 in the horizontal direction, and the threaded portion 44a of the bolt member 44 penetrates the joint member 43 in the direction perpendicular to the raised portion 15a that rises on the upper surface side of the common chamber 15. ing.

As a result, the drainage pipe 41 includes a connection flow path 41a that is horizontally connected to the joint member 43 of the connection portion 42 at least at the other end, and the connection portion 42 has a through hole facing downward in the direction perpendicular to the upper surface of the common chamber 15. The discharge flow path 44c connected to the 15c is provided, and the orifice 44d is horizontally connected to the terminal portion of the connection flow path 41a and is also connected to the discharge flow path 44c in the horizontal direction.

The orifice 44d is provided with the drainage pipe 41 in the connecting portion 42 connecting to the intake passage 3 in the horizontal direction, thereby preventing excessive air from being supplied to the engine 1 through the drainage pipe 41. This is particularly effective for CNG vehicles and the like that use natural gas as fuel. That is, in a CNG vehicle, since the output of the engine 1 is controlled by the opening degree (intake amount) of the intake adjustment valve 14, it is important to control the intake amount.

Specifically, the cross-sectional area orthogonal to the flow path of the orifice 44d is a disconnection that allows intake by, for example, a gap between the intake adjustment valve 14 and the intake passage 3 that occurs when the intake passage 3 is fully closed by design. When the area is 1, the ratio is set to 0.08 or less.

As a result, the air containing the condensed water is extended from the intercooler 13 in the horizontal direction including the drain pipe 41 and the joint member 43 by the negative pressure generated in the through hole 15c of the common chamber 15 due to the intake air flowing through the intake passage 3. The connection flow path 41a, the orifice 44d, the discharge flow path 44c, and the through hole 15c can be discharged to the intake passage 3 inside the common chamber 15 in this order.

As described above, the drainage device of the intercooler 13 according to the present embodiment is the intercooler 13 arranged in the intake passage 3 on the downstream side of the supercharger 5 that supercharges the intake air of the engine (internal engine) 1. And the intake air regulating valve 14 arranged in the intake passage 3 on the downstream side of the intercooler 13, one end is connected to the intercooler 13, and the other end is connected to the intake air passage 3 on the downstream side of the intake air conditioning valve 14. A condensed water removing passage 40 for discharging air containing condensed water generated by the intercooler 13 to the intake passage 3 is provided, and the condensed water removing passage 40 has an intake passage cross-sectional area orthogonal to the intake direction of the intake passage 3. The cross-sectional area of the discharge passage 44c orthogonal to the discharge direction of the air containing condensed water is narrowed, and an orifice 44d narrower than the cross-sectional area of the discharge passage 44c is provided at the end of the passage. Condensed water can be discharged satisfactorily without complicated discharge control of condensed water using a dedicated detection sensor or control device.

Further, in the drainage device of the intercooler 13 according to the present embodiment, the condensed water removal passage 40 is more than the drainage pipe 41 having one end connected to the intercooler 13, the other end of the drainage pipe 41 and the intake air regulating valve 14. It is defined by a connecting portion 42 that connects to the intake passage 3 on the downstream side and has an orifice 44d arranged therein. Specifically, the intake passage 3 includes a common chamber 15 having a diameter larger than that of the intake passage 3 between the intake adjustment valve 14 and the intake manifold 10, and the condensed water removal passage 40 has one end connected to the intercooler 13. The drainage pipe 41 is connected to the other end of the drainage pipe 41 and the common chamber 15, and the condensate water is drained to the common chamber 15 by being defined by the connection portion 42 in which the orifice 44d is arranged. At the same time, it is possible to suppress excessive mixing of condensed water into the intake manifold 10.

Further, in the drainage device of the intercooler according to the present embodiment, the drainage pipe 41 includes a connection flow path 41a which is horizontally connected to the connection portion 42 at at least the other end, and the connection portion 42 is a common chamber 15. The orifice 44d is horizontally connected to the terminal end portion of the connection flow path 41a and is also horizontally connected to the discharge flow path 44c. As a result, clogging of the emulsion and foreign matter at the orifice 44d can be suppressed.

By the way, the drainage device of the intercooler of the present invention is not limited to the above-described embodiment, and the technical scope described in the claims is various within the range not deviating from the gist of the invention. Includes redesigned forms.

For example, the drainage device of the intercooler 13 is configured to include a drainage pipe 41 and a connection portion 42, but the present invention is not limited to this. In addition to being directly connected to the upper surface of the drainage pipe 41, a block member having a small hole formed so as to have an orifice structure may be arranged in the middle portion (horizontal portion) of the drainage pipe 41.

In the above description, when there are descriptions such as "horizontal" and "vertical", each of these descriptions does not have a strict meaning. That is, "horizontal" and "vertical" mean "substantially horizontal" and "substantially vertical" because tolerances and errors in design and manufacturing are allowed. The tolerance and error here mean a unit within a range that does not deviate from the configuration, action, and effect of the present invention.

1 Engine 13 Intercooler 40 Condensed water removal passage 41 Drainage pipe 41a Connection flow path 42 Connection part 44 Bolt member 44c Discharge flow path 44d Orifice

Claims (2)

An intercooler located in the intake passage on the downstream side of the turbocharger that supercharges the intake air of the vehicle's internal combustion engine,
An intake air regulating valve arranged in the intake passage on the downstream side of the intercooler,
One end is connected to the intercooler, and the other end is connected to the intake passage on the downstream side of the intake adjustment valve to discharge condensed water containing air generated by the intercooler to the intake passage. With a passage,
The condensed water removal passage is
The cross-sectional area of the exhaust passage orthogonal to the discharge direction of the air containing condensed water is narrowed with respect to the cross-sectional area of the intake passage orthogonal to the intake direction of the intake passage, and is further narrower than the cross-sectional area of the discharge passage at the end of the passage. There is an orifice and
The internal combustion engine has an internal combustion engine main body and has an internal combustion engine body.
The intake passage
An intake manifold that is connected to the internal combustion engine main body and supplies the intake air in the intake passage to the internal combustion engine main body.
A common chamber provided between the intake air regulating valve and the intake manifold in the intake passage and having a diameter expanded at least downward in the vertical direction of the vehicle with respect to the intake passage is provided.
The condensed water removal passage is
A drainage pipe with one end connected to the intercooler,
A connection portion including a bolt connecting the other end of the drainage pipe and the common chamber,
Have,
The bolt is formed with the orifice communicating with the drainage pipe.
An intercooler drainage device that features this. The drainage pipe
A connection flow path that is horizontally connected to the connection portion at least at the other end is provided.
The connection part
A discharge flow path that is vertically connected downward to the upper surface of the common chamber is provided.
The orifice is
It is horizontally connected to the end of the connection flow path and horizontally connected to the discharge flow path.
The intercooler drainage device according to claim 1.

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