KR20020046532A - Heat protector for exhaust manifold - Google Patents

Abstract

PURPOSE: A heat protector is provided to activate an air flow around exhaust pipes to cool off especially thermally weak part. CONSTITUTION: A heat protector(40) comprises a cover plate(42) and an air inducing pipe(44). The cover plate is connected to cover in a constant interval upper part of a branching pipe(32) of an exhaust pipe(30). The air inducing pipe is a hemispherical open pipe attached at rear side of the cover plate to induce air forcibly between the branching pipes.

Description

Heat protector for exhaust manifold {HEAT PROTECTOR FOR EXHAUST MANIFOLD}

The present invention relates to a heat protector of an exhaust manifold, and more particularly, to a heat protector of an exhaust manifold that enables intensive cooling of a portion that is susceptible to thermal load by activating an air flow around the exhaust manifold.

In general, the exhaust manifold of a vehicle engine is a pipe that collects the exhaust gas discharged from each cylinder of the engine, and the exhaust gas is extremely high at about 600 to 900 ° C., and is discharged to the outside of the vehicle via the exhaust pipe and the silencer.

The heat protector fastened to the exhaust manifold is a protective cover for preventing thermal damage to the surrounding parts of the exhaust manifold, which is heated to a high temperature during engine operation.

1 is a cross-sectional view showing an assembled state of a heat protector of an exhaust manifold according to a conventional embodiment.

In FIG. 1, the cylinder head 2 is coupled to the upper end of the cylinder block 1 to form a plurality of combustion chambers, and one side surface of the cylinder head 2 has high heat exhaust generated from each combustion chamber during explosion and exhaust stroke. Exhaust manifolds 3 are coupled which allow gas to be sent out. The exhaust manifold 3 has a form in which a plurality of branch pipes 3a connected separately from each combustion chamber are merged into one. On the outer surface side of the branch pipe 3a of the exhaust manifold 3, a heat protector 4 made of a cover plate is coupled to form a predetermined interval.

The conventional heat protector 4 provided in this way can block the high heat dissipated from the exhaust manifold 3, in particular several branch pipes 3a, to prevent the deterioration of other components around it.

However, as shown in FIG. 2, the flow of air is very weak in the exhaust manifold 3 between the branch pipes 3a, that is, the side where the various branch pipes 3a merge into one, as shown by the arrow direction. There is a problem that the cooling performance is weak. This generates a thermal load on the exhaust manifold 3, and therefore, the heat resistance is weakened, which causes a decrease in durability.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a heat protector of an exhaust manifold capable of intensively cooling a thermally vulnerable portion by activating air flow around the exhaust manifold. have.

1 is a cross-sectional view showing an assembled state of a heat protector of an exhaust manifold according to a conventional embodiment.

2 is an operational state diagram illustrating air flow around a heat protector of an exhaust manifold according to a conventional embodiment.

3 is a perspective view showing a heat protector of the exhaust manifold according to the embodiment of the present invention;

4 is a cross-sectional view taken along the line A-A of FIG.

5 is a perspective view of main parts of a heat protector of an exhaust manifold according to another embodiment of the present invention;

6A and 6B are assembly and operating state diagrams illustrating air flow around a heat protector of an exhaust manifold in accordance with an embodiment of the present invention.

※ Explanation of codes for main parts of drawing

30: exhaust manifold 32: branch pipe

40: heat protector 42: cover plate

44, 440: air guide pipe 442: guide plate

444: ventilator

The heat protector of the exhaust manifold according to the present invention for achieving the above object is a cover plate coupled to the upper portion of the branch pipe of the exhaust manifold, and flows between each branch pipe of the exhaust manifold on the back of the cover plate. It characterized in that it comprises a plurality of air induction pipes added so as to forcibly guide the air flow.

The inner surface of the air induction pipe is preferably further provided with a guide plate for inducing air in a desired direction.

Preferably, the inner surface of the air induction pipe is further provided with a plurality of vents capable of intensively spraying air toward a portion where air flow is weak.

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

3 is a perspective view illustrating a heat protector of an exhaust manifold according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along line AA of FIG. 6A and 6B are assembly and operational state diagrams illustrating air flow around a heat protector of an exhaust manifold in accordance with an embodiment of the present invention.

In the figure, reference numeral 40 denotes a heat protector, which is composed of a cover plate 42 and an air induction pipe 44. That is, the cover plate 42 is coupled to cover the upper portion of the branch pipe 32 of the exhaust manifold 30 at a predetermined interval. The air induction pipe 44 is an approximately semi-circular opening pipe which is attached to the rear surface of the cover plate 42 at predetermined intervals, and is provided at a position between each branch pipe 32 of the exhaust manifold 30. Plural) are attached. This serves to force the air flow flowing between each branch pipe 32 of the exhaust manifold 30.

Furthermore, as in the other embodiment of the present invention shown in FIG. 5, when the guide plate 442 having a flange-like shape is further attached to the inner surface of the air induction pipe 440, the desired direction, that is, air It is highly desirable to be able to guide the air flow more efficiently towards the weaker part of the stream.

In addition, when a plurality of vents 444 are further penetrated in the required direction on the inner surface of the air induction pipe 440, the air flowing into the air induction pipe 440 concentrated toward the weak air flow portion It is very desirable to be able to spray.

Reference numeral 10 denotes a cylinder block, and reference numeral 20 denotes a cylinder head.

The heat protector 40 according to the present embodiment provided as described above is coupled to cover the branch pipe 32 of the exhaust manifold 30, as shown in FIGS. 6A and 6B. Here, the plurality of air guide pipes 44 are assembled so as to be located between the branch pipes 32 of the exhaust manifold 30, respectively.

At this time, the air flowing between the exhaust manifolds 30 is forced to flow through each of the air flow pipes 44, so an air flow chart between the branch pipes 32 of the exhaust manifold 30, which is a thermally fragile part (dotted line) As shown by the arrow). Of course, when the guide plate 442 or the plurality of vent holes 444 are further provided inside the air flow pipe 440 as in other embodiments, it is natural that the air flow may be activated even more in the thermally vulnerable portion. Therefore, since the temperature of the lower end portion of the exhaust manifold 30 can be forcibly concentrated, for example, the position of the catalyst is further advanced toward the branch pipe 32 so that the toxic components contained in the exhaust gas (eg, CO, NO) _x ) can also be reduced.

According to the present invention described above, the thermally vulnerable portion of the exhaust manifold can be intensively cooled, thereby further enhancing heat resistance and durability. In addition, since the limitation of the exhaust manifold shape can be reduced, the convenience of the driver can be improved through the optimum arrangement of the peripheral components. In addition, since the combustion temperature of the engine can be increased by improving the cooling performance, it is possible to prevent environmental pollution by exhaust gas purification.

Claims (3)

A cover plate coupled to the upper portion of the branch pipe of the exhaust manifold at a predetermined interval; And a plurality of air induction pipes attached to the rear surface of the cover plate so as to forcibly induce an air flow flowing between the respective branch pipes of the exhaust manifold. The method of claim 1, The air guide tube is a heat protector of the exhaust manifold, characterized in that the inner surface is further provided with a guide plate for inducing air in a desired direction. The method of claim 1, The air induction pipe is a heat protector of the exhaust manifold, characterized in that the inner surface is further provided with a plurality of vents for intensively spraying the air toward the weak air flow portion.