JPS6393331A - Cleaning device for exhaust - Google Patents

Abstract

PURPOSE:To eliminate the deviation generated at the stating end of winding and enhance exhaust cleaning efficiency, by forming engaging sections respectively at the starting ends of winding of corrugated section and a planar section of a metal material chamber and engaging said engaging sections with each other. CONSTITUTION:A corrugated foil 3 made of thin stainless steel foil and a planar foil 4 made of the same stainless steel foil are piled together and wound into an almost cylindrical shape to form up a honeycomb core body 2. The starting end of the corrugated foil 3 is bent in U-shape to form an engaging section 7, while the starting end of winding of the planar foil 4 is bent almost in U- shape to form an engaging section 8. At the time of starting winding the corrugated foil 3 and the planar foil 4, the starting ends of winding of said foils are not deviated. The bonded surfaces of the corrugated foil 3 and the planer foil 4 of the honeycomb core body 2 are covered with catalyst substances for exhaust cleaning such as platinum and the like.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for purifying engine exhaust gas, and more particularly, the present invention relates to a device for purifying engine exhaust gas, and more specifically, the present invention relates to a device for purifying engine exhaust gas. The present invention relates to an exhaust gas purification device in which a honeycomb core body is formed, and a catalyst material for exhaust gas purification is coated on the surface of the honeycomb core body.

[Prior Art] Generally, a catalytic exhaust purification device for an automobile has a structure in which a core body is provided within an outer cylinder and a catalyst material is coated on the surface of the core body. Various types of core bodies have been developed so that the core body has a large contact area with the exhaust gas and does not create resistance to the flow of the exhaust gas. As this core body, there is a so-called honeycomb core body in which stainless steel foil or the like is formed into a corrugated shape, and this is overlapped with a flat stainless steel foil and wound into a cylindrical shape. Since this type uses thin metal foil, it has features such as low resistance to the flow of exhaust gas.

By the way, when manufacturing such a honeycomb core body, the above-mentioned corrugated foil and flat foil are overlapped, their winding start ends are held on a mandrel, and these are wound around this mandrel. Ta.

As a result, a hole is formed in the center of the honeycomb core body after the mandrel is removed, and the exhaust gas passing through this hole does not come into sufficient contact with the catalyst material, resulting in a reduction in exhaust purification efficiency. .

[Problems to be Solved by the Invention] The present invention has been made based on the above-mentioned circumstances, and its purpose is to prevent the formation of holes in the center of the honeycomb core body due to the removal of the mandrel. The present invention provides an exhaust gas purification device that can improve exhaust gas purification efficiency.

[Means for solving the problems and their effects] The present invention has the following features:
The winding start ends of the corrugated portion and the flat plate portion are respectively bent to form locking portions, and these locking portions are engaged with each other. Therefore, when winding the corrugated portion and the flat plate portion, the winding start ends do not shift, and there is no need to use a mandrel. Therefore, no hole is formed in the center of the honeycomb core body due to the removal of the mandrel, and the efficiency of purifying exhaust gas can be improved.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

This embodiment is an automobile exhaust purification device.

1 in the figure is an outer cylinder, and this outer cylinder B1 is formed from a stainless steel plate into a cylindrical shape. And outside of this 1!1
The thickness of the stainless steel plate No. 1 used is, for example, 1.5 mm. A honeycomb core body 2 is inserted into this outer rs1.

This honeycomb core body 2 is constructed by stacking a corrugated portion 3 made of thin stainless steel foil into a corrugated shape and a flat plate portion 4 made of the same stainless steel foil, and winding them into a substantially cylindrical shape. This is what I did.

The stainless steel foil 5 used for these corrugated portions 3 and the flat plate portion 4 has a thickness of, for example, 40 μm, and is made of, for example, rolled ferritic stainless steel containing aluminum, which is not heat-treated after rolling. has been done. Further, on both sides of the foil 5 made of this rolled material, a brazing material layer 6 is adhered or coated in advance as shown in FIGS. 4 and 5. The brazing filler metal 1II6 is partially coated on the surface of the foil 5, for example, in the form of a band as shown in FIG. And like this, the brazing material 1
When the foil 5 coated with 6 is used as the flat plate part 4, it is used as it is as shown in FIG. 6, and when it is used as the corrugated part 3, it is used as shown in FIG. It is press-molded into a corrugated shape as shown.

Then, the corrugated portion 3 and the flat plate portion 4 are overlapped and wound into a substantially cylindrical shape to form the honeycomb core body 2. Then, this honeycomb core body 2 is heated to melt the brazing material layer 6 and the adjacent corrugated portions 3 and flat plate portions 4.
are brazed to each other. Then, a catalytic material for exhaust purification such as platinum is deposited on the surfaces of the corrugated portions 3 and the flat plate portions 4 of the honeycomb core body 2 brazed in this manner.

The central portion of this honeycomb core body 2, that is, the winding start end portion is configured as shown in FIG. That is, the winding start end of the corrugated part 3 is bent into a U-shape to form the locking part 7, and the winding start end of the flat plate part 4 is also bent into a substantially U-shape to form the locking part 8. has been done. Then, the corrugated portion 3 and the flat plate portion 4 are wound with the locking portions 7°8 engaged with each other. Therefore, when starting to wind the corrugated portion 3 and the flat plate portion 4, the winding start ends will not shift. Therefore, there is no need to use a mandrel or the like when manufacturing this honeycomb core body, and no holes are formed at the center of the honeycomb core body 2 where the mandrel was removed.

The outer cylinder 1 is made by punching a stainless steel plate into a rectangular shape with a plurality of holding protrusions 12 formed on the end edge.
As shown in the figure, it is formed by forming into a cylindrical shape and welding the mating portion 10 of the peripheral surface. The mating portion 10 is formed by stacking stainless steel plates on top of each other as shown in FIG. 9, and a stepped portion 11 having the thickness of the stainless steel plates is formed on the inner surface of the cylindrical outer tube 1. The height of the stepped portion 11, that is, the thickness of the stainless steel plate constituting the outer cylinder 1, is set approximately equal to the total thickness of the corrugated plate portion 3 and the flat plate portion 4. The step between the end edge of the waveform portion 3 and the flat plate portion 4 formed at the end of winding of the honeycomb core body 2, that is, the peripheral portion thereof, corresponds to the step portion 11, and the eighty-two cam core body 2 is The circumferential surface is configured to be inserted into the inner circumferential surface of the outer cylinder 1 in close contact with the inner circumferential surface of the outer cylinder 1 without any gaps.

Then, the holding protrusion 12 at one end of the outer cylinder 1 is bent inward, and then the honeycomb core body 2 is inserted into the outer cylinder 1, and then the holding protrusion 12 at the other end are bent inward, and these holding convex portions 12 prevent the honeycomb core body 2 from being pulled out.

Note that the present invention is not limited to the above embodiments.

For example, a stainless steel foil may be coated or coated with a brazing material layer on its entire surface, or it may be coated or coated with a brazing material layer on its entire surface, or the honeycomb core body may be formed after winding these corrugated portions and flat foils without coating such a brazing material layer. The entire body may be immersed in a molten brazing filler metal for brazing.

Moreover, the material of the above-mentioned corrugated part and flat foil is not limited to stainless steel, and other metal materials may be used.

Furthermore, the structure of the outer cylinder is not necessarily limited to the above structure, and may have other structures.

[Effects of the Invention] As described above, in the present invention, locking portions are formed at the winding start ends of the corrugated portion and the flat foil, and these locking portions are engaged with each other. The starting ends of these windings do not shift during winding, and these can be wound without using a mandrel. Therefore, no hole is formed in the center of the honeycomb core body due to the removal of the mandrel, and the efficiency of exhaust gas purification can be improved.
The effect is great.

[Brief explanation of the drawing]

Figure 1 shows an overall perspective view, Figure 2 is a side view, Figure 3 is a sectional view taken along the line ■-■ in Figure 2, and Figure 4 shows an embodiment of the present invention. A plan view of the foil used for the flat foil, FIG. 5 is a sectional view taken along line v-V in FIG. 4, FIG. 6 is a sectional view showing the shape of the flat foil, and FIG. 8 is an enlarged sectional view of the central part of the honeycomb core body, FIG. 9 is an enlarged sectional view of the peripheral part of the honeycomb core body, and FIG.
Figure 0 is a perspective view of the outer cylinder before inserting the honeycomb core body. DESCRIPTION OF SYMBOLS 1... Outer cylinder, 2... Honeycomb core body, 3... Corrugated part, 4... Flat plate foil, 5... Stainless steel foil, 6...
・Brazing metal layer, 7.8...Locking part, 11...Double section Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 12 Figure 3 Summary 5 Misconception 6 Figure Wh7 Figure 9 Figure 10 figure

Claims (1)

[Claims] A honeycomb core body is constructed by stacking a corrugated foil made of a metal material into a corrugated shape and a flat plate foil made of a metal material and winding them into a cylindrical shape, and an outer shell that accommodates this honeycomb core body. An exhaust purification device comprising a tube, wherein the winding start ends of the corrugated foil and flat foil are respectively bent to form locking portions, and these locking portions are engaged with each other. .