JPS5832918A - Monolith catalyst holding unit - Google Patents

Abstract

PURPOSE:To obtain a secure seal with less number of parts used by forming a V-shaped recess at a joint between an exhaust manifold and a catalyst container and by providing a V-shaped seal there so as to contact under pressure with the catalyst. CONSTITUTION:When a ''Monolith '' catalyst 1 is to be installed below an exhaust manifold 11, the flange of the exhaust manifold 11 and that of a catalyst container 6' are coupled with a bolt 17. A slope 13 is formed at the coupling edge of the exhaust manifold, and a slope 14 is likewise formed at the coupling edge of the catalyst container 6' so that a V-shaped groove 12 is formed by both slopes 13, 14. When a catalyst 1 is to be fixed, the catalyst 1 is placed on the step section in the container 6' through a cushion member 16, and a V-shaped seal ring 13 is inserted into the V-shaped groove 12, then the flange of the exhaust manifold 11 and the flange of the catalyst container 6' are coupled with each other to fix the catalyst.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a monolith catalyst holding device in an internal combustion IIIrIR exhaust gas purification device.

Conventionally, in the monolith catalyst system for exhaust gas purification, as shown in FIG. A gas nut 3 is provided. On the outer circumferential side of the monolithic catalyst 1, there is a spacer 5, an interram 7 that is a sealing member that prevents exhaust gas from passing between the monolithic catalyst 1 and the catalyst container 6, and
A wire net 8, which is an elastic member, absorbs the difference in thermal expansion between the monolithic catalyst 1 and the catalyst container 6 and the stress caused by vibration, etc., is provided. , an interram 7, a wire net 8, etc. constitute a holding device for the monolithic catalyst l. Therefore, the holding device for the monolithic catalyst l has a large number of female parts, which is high in cost and complicated in terms of assembly. Improvements such as these are desired. In particular, the interram 7 and the wire net 8 have problems in that they are expensive, large in size, and difficult to assemble.

The present invention has been devised in view of the above-mentioned problems, and its purpose is to stably and reliably hold a monolithic catalyst while reducing the number of parts. It is in providing the equipment. The feature is that in the monolithic catalyst holding device, the joint part of the exhaust manifold and the catalyst container is located at an appropriate location on the peripheral wall of the monolith catalyst, and the entire inside of the exhaust manifold and the catalyst container at the joint part is A slope is provided around the periphery of the exhaust manifold and the catalyst container to form a V-shape #, and an elastic ring having a triangular cross section and an outer shape that follows the outer circumferential shape of the monolithic catalyst is fitted to the #Iv-shaped S portion. An embodiment of the present invention will be described below with reference to FIG.

In 4), the joining part of the exhaust manifold Fil and the catalyst container 6' is located at the upper rIL of the peripheral wall of the monolithic catalyst l.
l! It is located near the end. Further, the exhaust manifold 11 and the catalyst container 6' are provided with slopes 13 and 14, respectively, on the entire inner circumference of their joint portions so that a V-shape 1112 is formed when the two are combined. An elastic ring 15 having a triangular cross section and an outer shape that follows the outer circumferential shape of the monolithic catalyst l is fitted into this ■-shaped groove 12.

The present embodiment has the configuration as described above, and the method for installing the monolith catalyst will now be described.

First, a cushion 16 is placed on the bottom of the catalyst container 6', and the monolithic catalyst 1 is placed thereon. Next - elastic ring 15
When inserted from above along the outer periphery of the monolithic catalyst l, it stops at the upper end slope 14 of the elastic ring tsFi catalyst container 6'. In order to simplify the work of inserting this elastic ring 150, it is preferable to position it near the upstream end of the peripheral wall of the monolithic fluid at the joint between the exhaust manifold 11 and the catalyst container 6'. If the ring 15 can perform the sealing and holding functions, it should be placed at an appropriate location on the peripheral wall of the monolithic catalyst l.Next, cover it with the two-way manifold 11.Then, the elastic ring 15 will be
It fits into a V-shaped groove formed by the catalyst container 6' and the exhaust manifold 11. And stud bolt 1
7 and nuts 18IIc, the V-shaped part 12 becomes narrower, and the ring 15 extends inward to restrain the monolithic catalyst 1.

According to the present invention as described below, the elastic ring provided at the joint between the exhaust manifold and the catalyst container has both the function of sealing the exhaust gas and the function of holding the monolithic catalyst.
flF, it is possible to provide a monolithic catalyst holding device that achieves effects such as a significant reduction in the number of parts, cost reduction, and improvement in assembly workability.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the vicinity of a conventional monolith catalyst.
-4 is a cross-sectional view of one embodiment of the present invention in use. l... Monolith catalyst 6.6'... Catalyst container 11.
...Exhaust manifold 12...■-shaped groove 13.14...Slope! 5.
・Elastic ring 1 diagram

Claims (1)

[Claims] (1) Position the joint of the exhaust manifold and the catalyst container at an appropriate location on the peripheral wall of the monolithic catalyst, and place the exhaust manifold and the catalyst on the said joint of the exhaust manifold and all the debris inside the A monolithic catalyst holding device characterized in that an inclined surface is provided with a V-shaped groove formed by a V-shaped groove, and an elastic ring having a triangular cross section and an outer shape that follows the outer circumferential shape of a monolithic catalyst is fitted into the W4V-shaped groove.