JPS631428A - Installation of catalyst converter - Google Patents

Abstract

PURPOSE:To retain catalyst carriers accurately by inserting spacers constituted with solids to be changeable to fluids between a plurarity of catalyst carriers, putting catalyst carriers and spacers in castings and fixing them through cushions. CONSTITUTION:Cushions 8 and gaskets 9 are wound around the outer periphery of catalysts 7, 7 and engaging rings 10 engaged with said periphery. Between said catalyst carriers 7, 7, as an example, ice rings 13 are put in as spacers, the whole of which are put in between shells 2. 2, and both of the flanges are welded, joints 14, 14 being welded to both ends. During or after welding flanges and joints 14, ice is melted and flows out through gas passages in catalyst carriers, not leaving any trace inside.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application in the Field of the Invention) The present invention relates to a method for assembling a catalyst co/parter to be attached to the exhaust system of an automobile east to purify exhaust gas discharged from an automobile engine or the like. (Prior Art) In a catalytic converter, two catalyst carriers of different types or the same type are installed with a gap between them in a casing, and the gas flowing out from the catalyst carrier of the previous stage is made to flow turbulently within the space, and the catalyst of the next stage is heated. It is well known that the catalyst can be dispersed into the carrier, and in order to assemble the front and rear catalyst carriers with a gap between them, the method shown in Figs. 4 and 5 is used.
In these figures, the catalyst carriers b and b are inserted into the case/guar with the peripheral surface buffer C and the gasket d fitted to the outer peripheral surface, and the catalyst carrier Between b and b, a spacer e and an end face buffer f, which are integral with or separate from the casing a, were interposed to create a blank g'k shape.
No., TRF 1986-42334, JP-A-59-21
No. 5914 and other publications, (Problems to be Solved by the Invention) In the above-mentioned prior art, the exhaust gas passage in the outer peripheral portion of the catalyst carrier is closed by the end face loosening body f, and the diameter D1 is There was a concern that the effective diameter of the catalyst carrier would be reduced to D2, which would reduce the utilization rate of the catalyst and reduce the purification ability.Therefore, in order to avoid this problem, even if spacer EF was eliminated, catalyst carrier B can be held in place using only the circumferential shock absorber C, but if extreme care is not taken during assembly, the position will shift during assembly and the width of space G will not be as specified. (Means for Solving the Problems) The present invention provides a means for maintaining the gap between catalyst carriers correctly when assembling the catalyst components. The means includes a method for assembling a catalytic converter in which a circumferential buffer and a gasket are fitted on the outer periphery of a catalyst carrier, and a plurality of catalyst carriers are mounted in a casing at intervals in the exhaust gas flow direction. A spacer made of a solid that can change into a fluid and emerge from the exhaust gas passage of the cod carrier is interposed between the opposing end faces of the plurality of catalyst carriers fitted with gaskets, and the catalyst carrier and spacer are placed in a casing. The present invention is characterized in that the catalyst carrier is fixed to the casing via the peripheral surface buffer. After the assembly is completed, the spacer melts or gasifies and flows out from the exhaust gas passage in the catalyst carrier, leaving a predetermined space. In the catalytic converter carrying out the method, the cushing (1) has a semicircular cross-section shell (21
．． (2+ k7 flange (31, (31) is formed by conical part +51. As shown in Fig. 2, the monolithic catalyst carrier (7) is provided with a diameter portion (61. A cushioning body (8) made of corrugated wire mesh and a gasket (9) made of a ceramic mat that expands when heated are wound around the cushioning body (8), and a locking ring G1 is fitted to the outer periphery of the cushioning body (8). As shown in FIG.
The width of Q■ is slightly narrower than the width of the enlarged diameter part (6) of the casing (1).The catalytic converter is assembled in the following order. First, wrap the catalyst carrier (force) around the outer periphery of the buffer body (8) and the gasket +91t by winding the catalyst carrier (force ,(7)
into the shell (2) facing upward and attach the locking ring (10L).
into the enlarged diameter part, 6), and both catalyst carriers t7), (7
) is inserted between the end faces of the water ring (1.31) to regulate the lower limit of the distance between the two ends.Next, when another shell (2) is pressed from above, the locking ring U The buffer body (6) is fully compressed, and as shown in FIG. As a result, the inner surface of the buffer member 18 is frictionally secured to the catalyst carrier (7), and the inner surface of the buffer member 18 is frictionally secured to the catalyst carrier (7). Since the catalyst carrier is locked at the step, the shell (2), both flanges (3) of (2),
(3) Fully in contact, with joints on both ends (1111, n4l
6 welding, (151 vin body + 21. (2
Before joining the conical part 151, (the above-mentioned flange +31, which is an inner pipe for forming a soundproof double wall inside the 5+), the a-contact work of (3) and the joint Q4+,
(During or after the welding work of 141, ice (1) melts and flows out through the gas passage in the catalyst carrier, leaving no trace inside.) The spacer is made of ice that liquefies like ice. Any material that vaporizes, such as camphor, can be used, but since the material that evaporates when burned produces smoke and residue, the ice spacer shown in the figure (13L is annular) is suitable. , it is necessarily annular, and the outer shape may also be polygonal, and it is also possible to support the M circumferential edge impactor (8) with the cage nog 111 without using a locking ring (invention Effects of the present invention: Because the spacer is interposed between the front and rear catalyst carriers and the catalyst carriers are assembled into the casing, the spacing between the catalyst carriers can be accurately maintained during assembly, and the spacer does not change its state after assembly. Since the water will flow out to the outside, there will be no inconvenience such as smoke or residue generation.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a catalytic converter assembled by the method of the present invention, Fig. 2 is a sectional view taken along the
The figure is a slope view of the locking ring, Figure 4 is a vertical cross-sectional view of a conventional catalytic converter, and Figure 5 is a vertical cross-sectional view of another conventional catalytic converter.
(1)...casing, (2)...shell, (7)...catalyst carrier, (8)...peripheral buffer,
03)...Spaceha 2 nights

Claims (1)

[Claims] Fitting a peripheral surface buffer and a gasket around the outer periphery of the catalyst carrier,
In this catalytic converter assembly method in which a plurality of catalyst carriers are installed in a casing at intervals in the exhaust gas flow direction, fluid is A spacer made of a solid that can change state and flow out from the exhaust gas passage of the catalyst carrier is interposed, the catalyst carrier and spacer are placed in a casing, and the catalyst carrier is fixed to the casing via a peripheral surface buffer. How to assemble a catalytic converter.