JPS5872613A - Exhaust manifold for automobile engine - Google Patents

Abstract

PURPOSE:To increase an effective part, performing catalytic action, improve a rate of exhaust gas purification and equalize a deteriorated degree of a catalyzer, by uniformly flowing exhaust gas in total area. CONSTITUTION:An exhaust gas flow regulating member 11, externally formed to a streamline shape, is provided from the downstream side of an exhaust gas collective part 1a in an exhaust manifold 1 to a location in the vicinity of an inlet center of a monolithic catalyzer 3, and constituted such that exhaust gas uniformly flows in total area. In this way, a flow of exhaust gas, tending to concentrate to a central part of the monolithic catalyzer 3, is dispersed to the external direction, then circulated uniformly flowing through to the outside of the monolithic catalyzer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exhaust manifold having a structure in which a monolithic catalyst for purifying exhaust gas is installed downstream of an automatic single-engine exhaust manifold.

Conventional exhaust manifolds of this type, for example,
The configuration is as shown in FIG.

In Figure 1, 1 is an exhaust manifold, 2 is a monolith catalyst case, 3 is a monolith catalyst, 4 is a cushion, 5 is a shim, 6 is a retainer, 7 is an interram, 8 is a wire net, and arrow 9Fi exhaust gas flow, arrow 10
shows the inertial force distribution of the exhaust gas flow. That is, the gas discharged from each cylinder is collected at a portion indicated by the reference numeral 1a, passes through the monolith catalyst 3, and flows from the downstream of the monolith catalyst case 2 to the exhaust nozzle. Here, since the downstream side of the monolith catalyst case 2 is narrowed to d8 with respect to the maximum diameter d of the exhaust gas collecting portion IJl, the inertial force distribution of the flow of exhaust gas passing through the monolith catalyst 3 is as shown by the arrow 10. The main flow is near the center, and there is a slight flow towards the outer periphery. Therefore, monolithic catalyst 3
The central part mainly performs the catalytic action.

The closer to the outer periphery, the smaller the catalytic action, and the smaller the area that effectively catalyzed, and the deterioration of the catalyst was uneven.

This invention #ii prevents the distribution of the exhaust gas flow passing through the monolith catalyst from concentrating on the central part of the monolith catalyst, and allows the exhaust gas to flow as much as possible over the entire area of the catalyst, so that the effective part that performs the catalytic action The object of the present invention is to provide an exhaust manifold for an automobile engine, which increases the exhaust gas purification rate and equalizes the degree of catalyst deterioration.

In light of this, the configuration of the exhaust manifold for an automobile engine of the present invention is such that the exhaust manifold is located slightly below the exhaust gas collecting portion in the exhaust manifold. An exhaust gas flow adjustment device that is installed between the center of the inlet of the monolithic catalyst and has a linear shape to guide the flow of exhaust gas outward and to make the gas flow distribution of the monolithic catalyst uniform. It is characterized by having parts.

Hereinafter, the embodiments of the present invention will be described in Section 21i! 17 will be explained with reference to FIG.

2 to 4 show a first embodiment of the present invention, 95
Figure 6 shows a second embodiment of the invention and is a companion.

In Figures 2 to 4, 11 is the exhaust gas tlLw.
As shown in FIG. 4, this I4 straightening member is provided between the slightly downstream opening of the exhaust gas collecting portion 1a and the vicinity of the center of the inlet of the monolithic catalyst (not shown), and its outer shape is as follows.
While directing the exhaust gas flow (see arrow 9'5r) outward, the gas flow distribution of the monolith catalyst (see arrow 1ot-)
It is designed to be almost uniform, resulting in a streamlined shape with low resistance to the flow of exhaust gas. That is, within iI
The exhaust gas flow adjusting member 11 is held by connecting the lower inner surface 1b of the exhaust manifold 1 with the holding ribs 12, 15, and 14.

In the exhaust manifold 1 for an automobile engine configured as shown in FIGS. 2 to 4, coral, dX2
Exhaust gas d from each boat of cylinders 1 to +4 in the figure is achieved at the exhaust gas collection s1a shown in FIG. Exhaust gas tIt'ft which tries to concentrate in
It is dispersed in the outward direction so that it passes evenly to the outside 11 of the monolithic catalyst. As a result, the effective part that performs the catalyst #1 action can be increased by one, and the exhaust gas purification rate can be improved and the deterioration of the monolith catalyst can be made uniform in each part.
-2- The exhaust gas flow adjusting member 11 shown in Figs. 5 and 6 is a press piece that is integrally formed with the holding lips 12, 13, and 14 by the press 1 process. It is similar to that shown in Figure #12 to Figure 4.

Therefore, the automobile exhaust manifold of the present invention is capable of directing the flow of exhaust gas outward by being soaked between slightly downstream of the exhaust gas collection part in the exhaust manifold and near the center of the inlet of the monolithic catalyst. Since the exhaust gas flow adjustment member having a streamlined outer shape is provided to guide the flow of the exhaust gas and to make the gas flow distribution t-#1 of the monolithic catalyst uniform, the distribution of the flow of the exhaust gas passing through the monolithic catalyst is made uniform. Exhaust gas is prevented from concentrating in the center of the monolith catalyst and flows evenly over the entire area #1, increasing the effective area for catalytic action, improving the exhaust gas purification rate, and uniformizing the degree of catalyst deterioration. Furthermore, since the external shape of the exhaust gas flow adjustment member is am-shaped, the resistance to the exhaust gas flow is extremely small, and the pressure drop caused by the provision of the exhaust gas flow adjustment member is almost negligible. It's not easy.

[Brief explanation of the drawing]

Figure 1 shows a conventional exhaust manifold for an automobile engine with a monolithic catalyst attached.
Figure i and Figure 2 are plan views showing the first embodiment of the present invention, and Figure 3 is a right 11th view of Figure 2. g 4 Figure t;! Figure 2 cutting! 1A-AKfE3 is a cross-sectional front view, FIG. 5 is a cross-sectional front view showing the second embodiment, and FIG. 6 is a bottom view of the exhaust gas flow adjusting member shown in FIG. 85. 1...Exhaust manifold, 1a...Exhaust gas
Set f1. 2... Monolith catalyst case, 5... Monolith catalyst, 11... Exhaust gas flow adjustment member, 12
．． 15゜14 ...Holding Lip 4 Room l Leap/Adoring 2 Figure 13 Figure °"Remain 4-"
Pa15 r・

Claims (1)

[Claims] (1) It is installed between slightly below the exhaust gas collecting part in the exhaust manifold to near the center of the inlet of the monolithic catalyst to guide the flow of exhaust gas outward and to make the gas flow distribution of the monolithic catalyst almost uniform. A to do! An exhaust manifold for automatic heavy industry, characterized in that it is equipped with an exhaust gas flow adjustment member that has an I-shaped exterior and is completely blind.