JP2016142145A - Exhaust pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust pipe capable of making uniform exhaust flow, while cooling the exhaust.SOLUTION: A radiator plate 103 is formed along a center axis J101 on an outer surface of a tubular portion 101. The radiator plate 103 has a platy shape. An exhaust flow adjusting plate 105 is formed along the center axis J101 so as to project out from an inner surface of the tubular portion 101 toward the center axis J101. The exhaust flow adjusting plate 105 has a platy shape. The radiator plate 103 and the exhaust flow adjusting plate 105 are formed as one platy member P100. Therefore, exhaust flowing inside can be further efficiently cooled. The exhaust flow adjusting plate 105 is formed along the center axis J100 of an exhaust pipe 100, so that a flow of the exhaust inside is straightened in a direction of the center axial J100 (refer to an arrow a21 direction and an arrow a23 direction).SELECTED DRAWING: Figure 2

Description

  The present invention relates to an exhaust pipe through which exhaust flows, and more particularly to an exhaust pipe that adjusts the flow of exhaust.

  A conventional exhaust pipe will be described with reference to an exhaust manifold shown in FIG. In the conventional exhaust manifold, by providing a large number of projections (8) on the inner wall of the inner cylinder (4) through which the exhaust gas flows, the contact area with the exhaust gas increases, and the exhaust heat is transferred to the inner cylinder (4). The heat exchange efficiency between the exhaust gas and the coolant (10) is greatly increased. Therefore, the inner cylinder (4) and the outer cylinder (9) covering the inner cylinder (4) can be reduced in size. Moreover, since the protrusions (8) are arranged in a staggered pattern, the exhaust gas effectively passes around the protrusions (8), the contact property is improved, and the heat transfer efficiency is further improved (Patent Document 1). reference).

JP 04-353212 A

  The above-described conventional exhaust manifold has the following points to be improved. A conventional exhaust manifold corresponds to a so-called water-cooled type. On the other hand, in an exhaust pipe that does not use a water-cooled type, for example, an air-cooled type exhaust pipe, it is said that a sufficient cooling effect cannot be obtained simply by forming a number of protrusions (8) on the inner wall of the inner cylinder (4). There are points to be improved.

  In addition, an A / F sensor that is a sensor for detecting the oxygen concentration in the exhaust gas and a catalyst are connected to the exhaust pipe. For A / F sensors and catalysts, it is required to allow uniform exhaust to flow in the exhaust pipe. Here, uniform exhaust refers to exhaust in which the flow is adjusted, that is, rectified exhaust, and in the case where the internal combustion engine has a plurality of cylinders, exhaust that does not vary in concentration and temperature between the cylinders, and an exhaust pipe. Exhaust with no temperature variation due to the difference in cooling that occurs between the side surface and the center of the exhaust pipe when flowing. In the conventional exhaust manifold, it is unclear whether uniform exhaust can be formed or not.

  Then, an object of this invention is to provide the exhaust pipe which can flow uniform exhaust_gas | exhaustion, cooling exhaust_gas | exhaustion.

  Means for solving the problems in the present invention and the effects of the invention will be described below.

  An exhaust pipe according to the present invention is an exhaust pipe having a central axis along the flow of exhaust gas, the outer projecting portion projecting outward on the outer surface of the exhaust pipe, The inner surface has an inner protrusion that protrudes inward.

  Thereby, uniform exhaust gas can be formed and flowed while cooling the flowing exhaust gas.

  The exhaust pipe according to the present invention is characterized in that the outer protrusion and the inner protrusion are formed in a direction along the central axis.

  As a result, uniform exhaust, particularly rectified exhaust, can be formed and flowed while cooling the flowing exhaust.

  The exhaust pipe according to the present invention is characterized in that the outer protrusion and the inner protrusion are formed in a direction that three-dimensionally intersects with the central axis.

  As a result, while cooling the flowing exhaust gas, uniform exhaust gas, particularly exhaust gas having no variation in concentration and temperature between cylinders, or temperature due to the difference in cooling generated between the side surface and the central portion of the exhaust pipe when flowing through the exhaust pipe It is possible to form and flow exhaust without variation.

1 is an external view of an exhaust pipe 100 that is an embodiment of an exhaust pipe according to the present invention. 2 is a cross-sectional view of a part of the exhaust pipe 100. FIG. FIG. 3 is a diagram showing the flow of exhaust in the exhaust pipe 100. It is an external view of the exhaust pipe 200 which is one Example of the exhaust pipe which concerns on this invention. FIG. 3 is a view showing a cross section of a part of an exhaust pipe 200. It is a figure which shows the other Example of the exhaust pipe which concerns on this invention. It is a figure which shows the conventional exhaust pipe.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  An exhaust pipe 100 for an automobile, which is an embodiment of the exhaust pipe according to the present invention, will be described below. The exhaust pipe 100 is connected to an exhaust port of the internal combustion engine, and guides exhaust exhausted from the internal combustion engine to a predetermined part.

  FIG. 1 shows an external view of the exhaust pipe 100. As shown in FIG. 1, the exhaust pipe 100 is located between an exhaust port EX (not shown) of the internal combustion engine and a catalyst part CT that cleans the exhaust. The exhaust pipe 100 includes a tubular portion 101, a heat radiating plate 103, and an exhaust flow adjusting plate 105 (see FIG. 2).

  The tubular part 101 has a cylindrical shape. The tubular portion 101 has an intake port N101 and an exhaust port X101. The intake port N101 is connected to the exhaust port EX of the internal combustion engine. The tubular part 101 has a flange F for connecting to the exhaust port EX in the inner edge period on the periphery of the intake port N101. The exhaust port X101 is connected to the catalyst part CT. Therefore, in the tubular portion 101, the exhaust discharged from the internal combustion engine flows in the direction of the arrow a101 from the intake port N101 toward the exhaust port X101. The tubular portion 101 has a central axis J101 along the flow of exhaust.

  The heat sink 103 is formed on the outer surface of the tubular portion 101 so as to protrude outward. Moreover, the heat sink 103 is formed along the central axis J101. In addition, the heat radiating plate 103 is disposed perpendicular to the side surface of the tubular portion 101. The heat sink 103 has a plate shape.

  FIG. 2 shows a part of a cross section along the heat radiating plate 103 of the exhaust pipe 100 in FIG. The exhaust flow adjusting plate 105 is formed on the inner surface of the tubular portion 101 so as to protrude inward. Further, the exhaust flow adjusting plate 105 is formed along the central axis J101. Further, the exhaust flow adjusting plate 105 is disposed perpendicular to the side surface of the tubular portion 101. The exhaust flow adjusting plate 105 has a plate shape. The heat radiating plate 103 and the exhaust flow adjusting plate 105 are formed as one plate member P100. The plate-like member P100 is fixed to the tubular portion 101 by welding or the like after being inserted into the insertion port I101 formed in the tubular portion 101.

  In this way, by forming the heat radiating plate 103 on the outer surface of the exhaust pipe 100, the exhaust flowing inside can be cooled more efficiently. Further, in the exhaust pipe 100, the exhaust flow adjusting plate 105 along the central axis J <b> 101 is formed on the inner surface of the tubular part 101, so that the exhaust flowing inside the tubular part 101 is cooled more efficiently. Further, since the exhaust flow adjusting plate 105 and the heat radiating plate 103 are integrally formed, the heat transmitted from the exhaust to the tubular portion 101 can be directly flowed to the heat radiating plate 103, and the exhaust can be more efficiently exhausted. Can be cooled.

  Further, since the exhaust flow adjusting plate 105 is formed along the central axis J100 of the exhaust pipe 100, the internal exhaust flow can be adjusted in the direction of the central axis J100 (see the directions of arrows a21 and a23). Therefore, as shown in FIG. 3, when exhaust gas flows into the exhaust pipe 100 from a plurality of internal combustion engines to the intake port N101, the exhaust (arrows a25, a27) that tries to flow from one side of the intake port N101 to the other side. Reference) can be the exhaust flow on the same side (see arrows a21, a23). That is, the exhaust gas can be rectified and the uniform exhaust gas can flow to the catalyst portion CT. Further, in the case where a sensor for detecting the oxygen concentration in the exhaust gas such as the A / F sensor S (see FIG. 1) is disposed, by rectifying the exhaust flow adjusting plate 105 toward the A / F sensor S, Uniform exhaust can flow through the A / F sensor S.

  In the above-described first embodiment, the exhaust pipe 100 has the heat radiating plate 103 and the exhaust flow adjusting plate 105 along the direction of the central axis J101 of the tubular portion 101. On the other hand, the exhaust pipe 200 of the automobile according to the present embodiment has an exhaust flow adjusting plate 205 in a direction that three-dimensionally intersects with the central axis J201 of the tubular portion 201 of the exhaust pipe 200. The exhaust pipe 200 is connected to the exhaust port of the internal combustion engine, like the exhaust pipe 100, and guides the exhaust discharged from the internal combustion engine to a predetermined part.

  FIG. 4 shows an external view of the exhaust pipe 200. The exhaust pipe 200 is located between the exhaust port EX of the internal combustion engine and the catalyst part CT that cleans the exhaust. The exhaust pipe 200 includes a tubular portion 201, a heat radiating plate 203, and an exhaust flow adjusting plate 205 (see FIG. 5).

  The tubular part 201 has a cylindrical shape. The tubular portion 201 has an intake port N201 and an exhaust port X201. The intake port N201 is connected to the exhaust port EX of the internal combustion engine. The tubular part 201 has a flange F for connecting to the exhaust port EX in the inner edge period on the periphery of the intake port N201. The exhaust port X201 is connected to the catalyst part CT. Therefore, in the tubular portion 201, the exhaust discharged from the internal combustion engine flows from the intake port N201 toward the exhaust port X201. The tubular portion 201 has a central axis J201 along the flow of exhaust.

  The heat radiating plate 203 is formed on the outer surface of the tubular portion 201 in a direction that three-dimensionally intersects with the central axis J201. Further, the heat radiating plate 203 is disposed perpendicular to the side surface of the tubular portion 201. The heat sink 203 has an annular shape.

  FIG. 5 shows a part of a cross section along a direction perpendicular to the heat radiating plate 203 of the exhaust pipe 200 in FIG. The exhaust flow adjusting plate 205 is formed in the tubular portion 201 so as to protrude inward. Further, the exhaust flow adjusting plate 205 is formed in a direction that three-dimensionally intersects with the central axis J201. The length L205 of the exhaust flow adjusting plate 205 protruding in the direction from the inner surface of the tubular portion 201 toward the central axis J201 is set to an amount that does not hinder normal exhaust flow. Further, the exhaust flow adjusting plate 205 is disposed perpendicular to the side surface of the tubular portion 201.

  The exhaust flow adjusting plate 205 has an annular shape. The heat radiating plate 203 and the exhaust flow adjusting plate 205 are formed as one plate-shaped annular member P200. After the plate-shaped annular member P200 is disposed between the first tubular portion 201a, the second tubular portion 201b, and the third tubular portion 201c that form the tubular portion 201, the first tubular portion 201a and the second tubular member P200 are welded or the like. It is fixed to the second tubular portion 201b and the third tubular portion 201c.

  By forming the exhaust flow adjusting plate 205 on the inner surface of the tubular part 201 in a direction three-dimensionally intersecting with the central axis J201, the exhaust gas flowing along the side surface of the tubular part 201 is directed in the direction of the central axis J201 (the direction of the arrow a31, a33 direction, a35 direction, a37 direction). As a result, the exhaust flowing inside can be mixed, so that when the internal combustion engine has a plurality of cylinders, variations in concentration and temperature that occur between the cylinders, and between the exhaust pipe side surface and the center when flowing through the exhaust pipe. Dispersion of temperature due to differences in cooling can be eliminated, and exhaust at a uniform temperature can flow.

[Other embodiments]
(1) Direction in which the heat radiating plate and the exhaust flow adjusting plate are formed: In the first embodiment, the heat radiating plate 103 and the exhaust flow adjusting plate 105 are arranged along the direction of the central axis J101 of the tubular portion 101 of the exhaust pipe 100. However, the present invention is not limited to the examples as long as the exhaust can be cooled and the flow of the exhaust can be adjusted. For example, the heat radiating plate 103 may be formed in a direction intersecting with the central axis J101 of the exhaust pipe 100, and the exhaust flow adjusting plate 105 may be formed along the direction of the central axis J101 of the exhaust pipe 100.

  The exhaust flow adjusting plate 105 is formed toward the central axis J101 of the tubular portion 101, that is, along the direction radiating from the central axis J101, but is formed so as to protrude from the inner surface of the tubular portion 101. If it is a thing, it will not be limited to the thing of an illustration. For example, the exhaust flow adjusting plate 105 may be formed in a direction in which a string is formed with respect to the tubular portion 101, that is, obliquely with respect to the central axis J101.

  In the second embodiment, the heat radiating plate 203 and the exhaust flow adjusting plate 205 are formed in a direction intersecting the central axis J100 of the exhaust pipe 100. However, the exhaust can be cooled and the flow of exhaust can be adjusted. If there is, it is not limited to the example. For example, the heat radiating plate 203 may be formed along the direction of the central axis J200 of the exhaust pipe 200, and the exhaust flow adjusting plate 205 may be formed in a direction crossing the central axis J200 of the exhaust pipe 200.

  (2) Configuration of heat dissipation plate and exhaust flow adjustment plate: In the first embodiment, the plate member P100 is used to form the heat dissipation plate 103 and the exhaust flow adjustment plate 105. However, heat is radiated to the outer surface of the exhaust pipe. The plate is not limited to the illustrated example as long as the exhaust flow adjusting plate can be formed on the inner surface. For example, as shown in FIG. 6, the end of the flat plate member P300 is bent along the fold line along the central axis J301 so as to face in opposite directions, and the vicinity of the bent portions is joined by welding or the like. May be. Thereby, the exhaust pipe 300 including the cylindrical portion 301, the heat radiating plate 301, and the exhaust flow adjusting plate 303 can be easily formed.

  Further, a plurality of plate-like members P100 may be arranged in the tubular portion 101.

  Furthermore, in the above-described second embodiment, the heat dissipating plate 203 and the plurality of exhaust flow adjusting plates 205 have an annular shape, but are not limited to those illustrated. For example, the heat radiating plate and the exhaust flow adjusting plate may be formed by a part of the annular shape. In this case, the heat sink and exhaust flow adjustment plate formed by a part of the annular shape are formed with an insertion hole in the cylindrical portion 201 in the same manner as the heat sink 103 and exhaust flow adjustment plate 105 of the first embodiment. A heat radiating plate and an exhaust flow adjusting plate formed by a part of an annular shape may be inserted into the formed insertion hole and fixed by welding or the like.

  (3) Connection destination of exhaust pipe: In the above-described first and second embodiments, the exhaust pipe 100 and the exhaust pipe 200 are both connected to the catalyst portion CT. It is not limited to the example.

  (4) Direction of the heat radiating plate and the exhaust flow adjusting plate relative to the tubular portion: In the first embodiment, the heat radiating plate 103 and the exhaust flow adjusting plate 105 are both disposed perpendicular to the side surface of the tubular portion 101. However, it may be arranged obliquely with respect to the side surface of the tubular portion 101. The same applies to Example 2.

  The exhaust pipe according to the present invention is used, for example, as an exhaust manifold of an automobile.

DESCRIPTION OF SYMBOLS 100 Exhaust pipe 101 Tubular part J101 Central axis 103 Radiation plate 105 Exhaust flow adjustment plate 200 Exhaust pipe 201 Tubular part J201 Central axis 203 Radiation plate 205 Exhaust flow adjustment plate

Claims (3)

An exhaust pipe having a central axis along the exhaust flow, the exhaust flow comprising:
On the outer surface of the exhaust pipe, an outer protruding portion that protrudes outward,
On the inner surface of the exhaust pipe, an inner projecting portion projecting inward,
Having an exhaust pipe. The exhaust flow adjusting exhaust pipe according to claim 1,
The outer protrusion and the inner protrusion are
Being formed in a direction along the central axis,
Exhaust flow adjustment exhaust pipe characterized by. The exhaust flow adjusting exhaust pipe according to claim 1,
The outer protrusion and the inner protrusion are
Formed in a direction three-dimensionally intersecting the central axis,
Exhaust flow adjustment exhaust pipe characterized by.

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