JP2021162220A - Intercooler - Google Patents

Abstract

To effectively inhibit peeling of intake air.SOLUTION: An intercooler 1 has: a passage expanding part 23 which is connected at an upstream end to an intake air introduction pipe 21 and in which an intake air passage expands from the upstream end to a downstream end; an inlet header part 22 connected to the downstream end of the passage expanding part 23; and a core part 10 in which multiple tubes 11 extending from the inlet header part 22 are arranged parallel to each other. An inner peripheral surface of the passage expanding part 23 is provided with a curve surface part 23A which curves as the passage expands. The curve surface part 23A is provided with a peeling inhibiting part 50 including at least one of recessed parts or protruding parts.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to an intercooler.

Generally, an intercooler mounted on a vehicle has a vertically long entrance header portion, a core portion in which a plurality of tubes extending in the horizontal direction from the entrance header portion are arranged in parallel in the vertical direction, and a vertically long portion in which each tube is connected. It is configured to include the exit header part of. Such an intercooler is described in, for example, Patent Document 1.

Japanese Unexamined Patent Publication No. 2011-133198

In the structure described in Document 1 above, the intake pipe on the upstream side and the inlet header portion are connected by a flow path expanding portion in which the cross-sectional area of the flow path gradually expands, and the flow path expanding portion connects the lower inner peripheral surface thereof. It is formed by being curved downward. Therefore, the intake air flowing along the lower inner peripheral surface of the flow path expansion portion is separated at the curved portion, and this separation becomes a resistance, which may increase the pressure loss.

The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide an intercooler capable of effectively suppressing separation of intake air.

In the technique of the present disclosure, the upstream end is connected to the intake air introduction pipe, and the intake flow path expands from the upstream end to the downstream end, and is connected to the downstream end of the flow path expansion portion. In an intercooler having an inlet header portion to be formed and a core portion in which a plurality of tubes extending from the inlet header portion are arranged in parallel, an inner peripheral surface of the flow path expansion portion is provided with the expansion of the flow path. A curved curved surface portion is provided, and the curved surface portion is provided with a peeling suppressing portion including at least one of a concave portion or a convex portion.

Further, it is preferable that at least one of the concave portion or the convex portion extends in a direction orthogonal to the flow direction of the intake air flowing along the curved surface portion.

Further, it is preferable that the peeling suppressing portion has a plurality of the concave portions and the convex portions, and the concave portions and the convex portions are alternately arranged.

Further, it is preferable that the recess is formed by denting the curved surface portion on the opposite side of the flow path in a hemispherical shape.

According to the technique of the present disclosure, the separation of the intake air can be effectively suppressed.

It is an overall block diagram which shows typically the engine which concerns on this embodiment. It is a perspective view which shows typically the intercooler which concerns on this embodiment. It is a schematic diagram which shows the main part of the intercooler which concerns on this embodiment by partially cut out. (A) is a notch diagram schematically showing the flow of intake air of the main part of the intercooler according to the present embodiment, and (B) is a schematic view of the flow of intake air of the main part of the intercooler according to the comparative example. It is a notch diagram which shows. It is a schematic diagram which shows the main part of the intercooler which concerns on other embodiment by partially cut out. It is a schematic perspective view which shows the main part of the intercooler which concerns on another embodiment by partially cut out.

Hereinafter, the intercooler according to the present embodiment will be described with reference to the attached drawings. The same parts have the same reference numerals, and their names and functions are also the same. Therefore, detailed explanations about them will not be repeated.

[overall structure]
First, the overall configuration of the engine E including the intercooler 1 according to the present embodiment will be described with reference to FIG.

As shown in FIG. 1, the engine E mainly has a cylinder head CH and an engine main body portion each of which is composed of a cylinder block, a crankcase, or the like (not shown). The cylinder block is provided with a cylinder C that accommodates the piston so that it can be reciprocated. In the illustrated example, the engine E is shown as an in-line 4-cylinder engine, but it may be a single-cylinder engine or a multi-cylinder engine other than the 4-cylinder engine.

An intake manifold 2 that distributes intake air to each cylinder C is provided on the side portion of the cylinder head CH on the intake side. An intake passage 3 for introducing intake air is connected to the intake manifold 2. The intake passage 3 is provided with an air cleaner 4, an upstream intake pipe 5, a compressor 42 of the supercharger 40, an intermediate intake pipe 6, an intercooler 1, a downstream intake pipe 7, and the like in this order from the intake upstream side. An exhaust manifold 8 for collecting the exhaust gas discharged from each cylinder C is provided on the side portion of the cylinder head CH on the exhaust side. An exhaust passage 9 for discharging exhaust gas to the atmosphere is connected to the exhaust manifold 8. The exhaust passage 9 is provided with a turbine 41 of the turbocharger 40, an exhaust aftertreatment device (not shown), and the like in order from the exhaust upstream side.

The intercooler 1 cools the intake air compressed by the compressor 42 of the supercharger 40 by exchanging heat with the traveling wind. Specifically, the intercooler 1 introduces into the core portion 10 a core portion 10 that exchanges heat between the intake air and the outside air, and an intake air that is pumped from the compressor 42 of the supercharger 40 via the intermediate intake pipe 6. It includes an intake intake section 20 and an intake lead-out section 30 that draws intake air from the core section 10 to the downstream intake pipe 7. Hereinafter, the details of the intercooler 1 according to the present embodiment will be described.

[Intercooler]
FIG. 2 is a perspective view schematically showing the intercooler 1 according to the present embodiment.

The core portion 10 is configured by arranging a plurality of tubes 11 extending in the lateral direction (vehicle width direction) in parallel in the vertical direction to circulate intake air, and is interposed between the plurality of tubes 11 and each tube 11. A plurality of outer fins 12 are provided, a vertically long inlet plate 13 for inserting and fixing the intake upstream end of each tube 11 through a plurality of through holes (not shown), and an intake downstream of each tube 11 through a plurality of through holes (not shown). It is provided with a vertically long outlet plate 14 through which an end is inserted and fixed.

The inlet plate 13 and the outlet plate 14 are provided so that their longitudinal directions are orthogonal to the axial directions of the plurality of tubes 11, in other words, the longitudinal directions are the arrangement directions of the tubes 11.

The intake intake portion 20 has an inlet pipe portion 21 (an example of the intake intake pipe of the present disclosure) which is connected to the intermediate intake pipe 6 and extends in the front-rear direction of the vehicle, and a vertically long hollow shape attached to the inlet plate 13 of the core portion 10. It includes an inlet header portion 22, a curved hollow flow path expanding portion 23 that smoothly connects the inlet pipe portion 21 and the inlet header portion 22, an upper rectifying plate 24, and a lower rectifying plate 25.

The flow path expanding portion 23 is formed so that the flow path area of the intake air expands from the intake inlet side to the intake outlet side. The lower inner peripheral surface of the flow path expanding portion 23 is provided with a curved surface portion 23A that curves inward (on the intake flow path side) as the flow path expands.

The downstream end of the flow path expanding portion 23 is connected to the side surface of the inlet header portion 22 from the vehicle width direction from the upper end side of the inlet header portion 22 to the vicinity of the center position in the longitudinal direction (vertical direction). Further, the connection position between the inlet pipe portion 21 and the upstream end of the flow path expansion portion 23 is offset upward from the center position in the longitudinal direction (vertical direction) of the inlet header portion 22.

The upper rectifying plate 24 is provided in the flow path expanding portion 23, and is curved from the inlet pipe portion 21 side to the side of the core portion 10 in an upward view so as to follow the shape of the flow path expanding portion 23. It is formed like this.

The upstream end portion 24A of the upper rectifying plate 24 is provided so that its plate plane extends substantially parallel to the upper inner peripheral surface of the flow path expanding portion 23. The downstream end 24B of the upper rectifying plate 24 is located in the flow path expanding portion 23 above the center of the inlet header portion 22 in the longitudinal direction (vertical direction), and its plate plane is the intake flow direction of the tube 11 (tube 11). A predetermined clearance is provided from the intake upstream end of the tube 11 so as to extend substantially parallel to the axial direction).

The lower rectifying plate 25 is provided below the upper rectifying plate 24 in the flow path expanding portion 23, and is viewed upward from the inlet pipe portion 21 side to the core portion so as to follow the shape of the flow path expanding portion 23. It is formed so as to be curved toward the side of 10.

The upstream end portion 25A of the lower rectifying plate 25 has a plate plane separated from the lower inner peripheral surface of the flow path expanding portion 23 in the flow path expanding portion 23 below the upstream end portion 24A of the upper rectifying plate 24. However, it is provided so as to extend substantially in parallel. The downstream end portion 25B of the lower rectifying plate 25 extends into the flow path expanding portion 23 below the downstream end portion 24B of the upper rectifying plate 24 so that its plate plane extends toward the lower end side of the inlet header portion 22. , Is provided at a predetermined clearance from the intake upstream end of the tube 11.

The intake lead-out portion 30 includes a vertically long hollow outlet header portion 32 attached to the outlet plate 14 of the core portion 10, an outlet pipe portion 31 connected to the downstream intake pipe 7 and extending in the front-rear direction of the vehicle, and an outlet pipe portion. A curved hollow flow path reducing portion 33 for smoothly connecting the 31 and the outlet header portion 32 is provided.

The flow path reducing portion 33 is formed so that the flow path area of the intake air is reduced from the intake inlet side to the intake outlet side. The intake upstream end of the flow path reducing portion 33 is connected to the side surface of the outlet header portion 32 from the vehicle width direction from the upper end side of the outlet header portion 32 to the vicinity of the center position in the longitudinal direction (vertical direction). Further, the connection position between the outlet pipe portion 31 and the flow path reduction portion 33 is offset upward from the center position in the longitudinal direction (vertical direction) of the outlet header portion 32.

In the present embodiment, the curved surface portion 23A is provided with a peeling suppressing portion 50 that suppresses the peeling of the intake air flowing along the curved surface portion 23A. Hereinafter, the details of the peeling suppressing unit 50 will be described.

[Peeling suppression part]
FIG. 3 is a schematic view showing a main part of the intercooler 1 according to the present embodiment by partially cutting out.

The peeling suppressing portion 50 is provided on the curved surface portion 23A of the flow path expanding portion 23, and has a plurality of concave portions 51 and a plurality of convex portions 52, respectively. The recess 51 is formed by denting a part of the curved surface portion 23A to the outside (opposite to the intake flow path) in a groove shape. The convex portion 52 is formed by projecting a part of the curved surface portion 23A inward (on the intake flow path side) in a ridge shape. The concave portion 51 and the convex portion 52 extend in a direction substantially orthogonal to the flow direction of the intake air flowing along the curved surface portion 23A. Further, the concave portions 51 and the convex portions 52 are alternately arranged in the flow direction of the intake air flowing along the curved surface portion 23A. That is, a plurality of concave portions 51 and a plurality of convex portions 52 are provided alternately in a direction substantially orthogonal to the intake air flowing along the curved surface portion 23A. This makes it possible to prevent the intake air flowing along the curved surface portion 23A from peeling off.

Next, the action and effect of the intercooler 1 according to the present embodiment will be described with reference to a comparative example.

FIG. 4B is a notched perspective view schematically showing the flow of intake air at the main part of the intercooler 101 according to the comparative example. The intake air flowing along the curved surface portion 123A is indicated by a dashed line.

In the intercooler 101 according to the comparative example, the intake air A11 flows in a laminar flow along the curved surface portion 123A of the flow path expansion portion 123. That is, the intake air A11 flows in parallel with the curved surface portion 123A, and the closer to the curved surface portion 123A, the slower the flow velocity. Therefore, the intake air A11 is separated from the curved surface portion 123A, and the vortex generated by the separation becomes a resistance, which may increase the pressure loss.

FIG. 4A is a notched perspective view schematically showing the flow of intake air in the main part of the intercooler 1 according to the present embodiment. The intake air flowing along the curved surface portion 23A is indicated by a dashed line.

In the intercooler 1 of the present embodiment, the upstream end portion 24A extends substantially parallel to the upper inner peripheral surface of the flow path expansion portion 23 in the flow path expansion portion 23, and the upstream end portion 25A. Is provided with a lower rectifying plate 25 extending substantially parallel to the lower inner peripheral surface of the flow path expanding portion 23 while being separated from the lower inner peripheral surface. As a result, the intake air flowing into the flow path expanding portion 23 flows between the upper inner peripheral surface of the flow path expanding portion 23 and the upper rectifying plate 24, and between the upper rectifying plate 24 and the lower rectifying plate 25. The intake air A3 flowing through the air intake A3 and the intake air A1 flowing between the lower rectifying plate 25 and the lower inner peripheral surface of the flow path expansion portion 23 are distributed, and the intake air is effectively distributed to each tube 11. Will be possible.

Further, a peeling suppressing portion 50 is formed on the curved surface portion 23A provided on the lower inner peripheral surface of the flow path expanding portion 23. As a result, the intake air A1 flowing along the curved surface portion 23A is disturbed by the concave portion 51 and the convex portion 52 of the peeling suppressing portion 50, and flows in a turbulent state. That is, the intake air A1 flowing along the curved surface portion 23A is configured so that the flow direction is not uniform and the flow velocity is substantially the same regardless of whether the flow velocity is close to the curved surface portion 23A or far away from the curved surface portion 23A. ing. As a result, the closer the intake air A1 is to the curved surface portion 23A, the slower the flow velocity, and it is possible to effectively prevent the intake air A1 from peeling off from the curved surface portion 23A. Further, by preventing the intake air A1 from peeling off from the curved surface portion 23A, it is possible to suppress an increase in pressure loss and prevent deterioration of intake air efficiency.

[others]
The present disclosure is not limited to the above-described embodiment, and can be appropriately modified and implemented without departing from the spirit of the present disclosure.

For example, in the above-described embodiment, the peeling suppressing portion 50 provided on the curved surface portion 23A of the flow path expanding portion 23 has been described as having a concave portion 51 and a convex portion 52, respectively, but the concave portion 51 or the convex portion 51 or the convex portion 52. It may include at least one of the parts 52. When only one recess 51 is provided, it is preferable to form the groove area of the recess 51 to be larger than that of the above embodiment, as shown in FIG.

Further, in the above-described embodiment, the peeling suppressing portion 50 has been described as having a groove-shaped recess 51, but as shown in FIG. 6, a part of the curved surface portion 23A is outside from the intake flow path side. A plurality of recesses 51 formed by being recessed in a substantially hemispherical shape on the opposite side in the direction may be provided.

1 Intercooler 2 Intake manifold 3 Intake passage 5 Upstream side intake pipe 6 Intermediate intake pipe 7 Downstream side intake pipe 8 Exhaust manifold 10 Core part 11 Tube 12 Outer fin 13 Inlet plate 14 Outlet plate 20 Intake introduction part 21 Intake pipe part (Intake) Introduction pipe)
22 Inlet header part 23 Flow path expansion part 23A Curved surface part 24 Upper rectifying plate 25 Lower rectifying plate 30 Intake lead-out part 31 Outlet pipe part 32 Outlet header part 33 Flow flow reduction part 40 Supercharger 41 Turbine 42 Compressor 50 Peeling suppression part 51 Concave part 52 Convex part

Claims (4)

A flow path expansion portion in which the upstream end is connected to the intake intake pipe and the intake flow path expands from the upstream end to the downstream end.
An inlet header portion connected to the downstream end of the flow path expansion portion and
In an intercooler having a core portion in which a plurality of tubes extending from the inlet header portion are arranged in parallel.
A curved surface portion that curves with the expansion of the flow path is provided on the inner peripheral surface of the flow path expansion portion.
An intercooler characterized in that the curved surface portion is provided with a peeling suppressing portion including at least one of a concave portion or a convex portion. The intercooler according to claim 1, wherein at least one of the concave portion or the convex portion extends in a direction orthogonal to the flow direction of the intake air flowing along the curved surface portion. The intercooler according to claim 1 or 2, wherein the peeling suppressing portion has a plurality of the concave portions and the convex portions, and the concave portions and the convex portions are alternately arranged. The intercooler according to any one of claims 1 to 3, wherein the recess is formed by denting the curved surface portion on the side opposite to the flow path in a hemispherical shape.

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