JP2578212Y2 - Stacked catalyst carrier for exhaust gas purification - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for producing carbon monoxide (CO) and nitrogen oxide (NO ) in exhaust gas discharged from an internal combustion engine.
The present invention relates to a stacked catalyst carrier for redoxing and purifying harmful gases such as x) and hydrocarbons (HC).

[0002]

2. Description of the Related Art A belt-shaped flat plate having an exhaust gas purifying function and
Conventional exhaust gas purifying laminated catalyst carriers in which belt-like corrugated sheets are alternately laminated and the laminated body is surrounded by a casing are disclosed in JP-A-59-162317 and JP-A-62-23455.
No. 3, JP-A-62-160727.

[0003] For example, in Japanese Unexamined Patent Publication No. 59-162317, as shown in FIGS. 5 and 6, a metal strip of platinum, rhodium, rare earth metal, cesium, etc. is prepared. As shown in FIG. 5, a band-shaped corrugated plate 01 formed by curving a central portion of the band-shaped plate into a U-shape and then forming a wavy shape.
Is formed so as to sandwich one of the wavy portions 02 between the two parallel portions 04 of the band-shaped flat plate 03 to form a set of laminated unit bodies 05, and the laminated unit bodies 05 having slightly different lengths are stacked in several layers. In this state, the laminated unit 06 is integrally joined to each other to form a laminated unit 06, and the half casings 07 formed in a shape surrounding the outer edge of the laminated unit 06 abut on both side surfaces of the laminated unit 06, and the half casing 07 is formed. The edges were joined together by welding or the like.

[0004]

In the conventional stacked catalyst carrier for exhaust gas purification shown in FIGS. 5 and 6, the thickness of the outer peripheral portion 08 of the stacked unit 06 is equal to two or three strip-shaped plates. 4 (the right end portion is overlapped with two sheets and the left end portion is overlapped with three sheets in FIG. 4), and the rigidity of the outer peripheral portion 08 is low. It easily deformed when contacted, and it was difficult to manufacture the laminated unit 06.

Further, since the outer periphery of the stacking unit 06 is surrounded by a half casing 07, it is necessary to increase the dimensional accuracy of the two units, and also requires a lot of man-hours and materials, making it difficult to reduce the cost. Was.

Further, since the laminated unit 06 and the half casing 07 are made of different materials and have different coefficients of thermal expansion, when the laminated unit 06 is heated by exhaust gas purification, stress due to thermal strain is reduced. There was a disadvantage that it easily became large.

[0007]

SUMMARY OF THE INVENTION The present invention relates to an improvement of a stacked catalyst carrier for exhaust gas purification overcoming such difficulties, and alternately superimposes strip-shaped flat sheets and strip-shaped corrugated sheets in a multilayer. In the exhaust gas purifying laminated catalyst carrier, the length of the bent portion bent toward the adjacent band-shaped flat plate at both ends of the band-shaped flat plate is set to a dimension longer than the mutual interval between the adjacent band-shaped flat plates, The front end of the bent portion is overlapped with a band-shaped flat plate adjacent to the bent side of the bent portion and integrally joined.

According to the present invention, as described above, the ends of the bent portions at both ends of the band-shaped flat plate are overlapped and integrally joined to the band-shaped flat plate adjacent to the bending side. The end of the belt-shaped corrugated sheet does not protrude outward alone, and is unlikely to be deformed even when it comes into contact with another object.

Further, according to the present invention, the front end of the bent portion of the band-shaped flat plate is adhered to the bent-side band-shaped flat plate to be integrated as a whole. Cost can be reduced.

Further, in the present invention, since the laminated catalyst carrier for purifying the exhaust gas is constituted by the band-shaped flat plate and the band-shaped wave having the same composition, it is possible to prevent the occurrence of stress based on the difference in the coefficient of thermal expansion during operation. And durability can be improved.

Further, in the present invention, by changing the bending position of the band-shaped flat plate, it is possible to form a laminated catalyst carrier having not only a short cross section but also various cross sections such as an oval shape.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention shown in FIG. 1 will be described below. The strip-shaped flat plate 2 and the strip-shaped corrugated plate 10 which constitute the stacked rectangular parallelepiped catalyst carrier 1 for purifying exhaust gas of this embodiment.
Is made of a belt-like plate in which a metal catalyst such as platinum, rhodium, rare earth metal, and cesium is integrally coated on the surface of a substrate having high heat resistance and high contact resistance such as stainless steel.

Both ends of the band-shaped flat plate 2 are bent inward (downward in the upper half and upward in the lower half) with a fold 5 as a boundary to form a bent portion 4. On the inner surface of the plane portion 3, the top 11 of the belt-like corrugated sheet 10 (based on the upper half,
The lower half has a downwardly curved portion, but only the upper half will be described below).

Further, the bent portion 4 of the band-shaped flat plate 2 has an angle α = 90 ° + θ (Tan ⁻¹ θ = t / h, h;
The height i of the bent portion 4 is set to be longer than the height h of the band-shaped corrugated plate 10 in the direction of the height of the band-shaped corrugated plate 10, t;

However, the bent portion of the strip-shaped flat plate 2a located at the upper and lower central portions of the stacked rectangular parallelepiped catalyst carrier 1 for purifying exhaust gas.
4a and the bent portion 4b of the strip-shaped flat plate 2b adjacent below the strip-shaped flat plate 2b are set shorter than the height h of the strip-shaped corrugated plate 10, and
The bent portion 4b is bent inward on the side closer to the bent portion 4a of the upper band-shaped flat plate 2a, and the bent portion 4b is overlapped on the inner surface of the bent portion 4a.

The outer surface of the flat portion 3 of the inner flat plate 2 is brought into contact with the valley portion 12 of the flat corrugated plate 10 adhered to the inner surface of the flat portion 3 of the outer flat plate 2.
The outer surface of the bent portion 4 of the inner band-shaped flat plate 2 is brought into contact with the inner surface of the bent portion 4 of the outer band-shaped flat plate 2, and this is repeated one after another. In the flat portion 3a of the band-shaped flat plate 2a located at the upper and lower center portions of the valley portion 12a of the upper band-shaped corrugated plate 10a and the valley portion 12b of the lower band-shaped corrugated plate 10b (the top portion 11 and the valley portion 12 in the lower half portion). Is upside down)
And the upper corrugated sheet 10a on the plane portion 3a so that
The valley portions 12a of the lower corrugated plate 10b and the valley portions 12b of the lower corrugated sheet 10b are brought into contact with each other, and these contact portions are integrally bonded by welding, plating, or the like. Can be configured.

In the embodiment shown in FIG. 1, the outer surface of the stacked rectangular parallelepiped catalyst carrier 1 for purifying exhaust gas is stepped by the thickness t of the strip-shaped flat plate 2, but the end portions of the strip-shaped flat plate 2 and the strip-shaped corrugated plate 10 are formed. Since it does not protrude outside the exhaust gas purifying stacked rectangular parallelepiped catalyst carrier 1 alone, no casing is required to cover the outer periphery thereof, the number of parts and man-hours can be reduced as compared with the conventional one, and a large cost is obtained. Down can be planned.

Since the mutually contacting portions of the bent portions 4 of the adjacent band-shaped flat plates 2 are overlapped and integrally bonded, the strength and rigidity of the portions are increased, and there is no fear that the bent portions 4 are peeled off by vibration or the like. High durability. Further, even if the stacked rectangular parallelepiped catalyst carrier 1 for purifying exhaust gas is heated to a high temperature, it is not damaged.

In the embodiment shown in FIG. 1, since the number of the strip-shaped flat plates 2 is 11 and the number of the strip-shaped corrugated plates 10 is 10, the strip-shaped flat plates 2a are located at the upper and lower central portions of the stacked rectangular catalyst carrier 1 for purifying exhaust gas. As shown in FIG. 2, when the number of the band-shaped flat plates 2 is 10, such as ten, and the number of the band-shaped corrugated plates 10 is nine, the vertical center of the stacked rectangular parallelepiped catalyst carrier 1 for purifying exhaust gas is adjusted. The bent portion 4a of the band-shaped flat plate 2a above the band-shaped corrugated plate 10a and the bent portion 4b of the band-shaped flat plate 2b below the band-shaped corrugated plate 10a,
The folded portion 4a and the folded portion 4b of FIG. 1 are overlapped in the same manner, and the flat portion 3b of the flat strip 2b below the striped corrugated plate 10a is set as a vertically symmetrical surface. Valley 12c (top 11 and valley 12 are upside down in the lower half)
May be arranged.

As shown in FIG. 3, the bent portion 4a of the band-shaped flat plate 2a above the band-shaped corrugated plate 10a located at the center of the vertical direction of the stacked rectangular parallelepiped catalyst carrier 1 for purifying exhaust gas is replaced with the band-shaped corrugated plate 10.
a, which extends below the fold 5b of the band-shaped flat plate 2b below the bent portion 4b of the band-shaped flat plate 2b below the band-shaped corrugated plate 10a, and is bent outwardly of the bent portion 4b. 4a may be superimposed.

Further, as shown in FIG. 4, the position of the fold 5 of the band-shaped flat plate 2 is sequentially changed so that the envelope 7 of the fold 5 of the band-shaped flat plate 2 becomes an oval shape. The tip of the portion 4 is folded back so as to be parallel to the plane portion 3, and the tip of the folded portion 8 is folded again so as to be parallel to the bent portion 4 to form a refolded portion 9. Then, the inner surface of the folded portion 8 of the outer band-shaped flat plate 2 is brought into contact with the outer surface of the flat portion 3 of the inner band-shaped flat plate 2, and the inner surface of the refolded portion 9 of the outer band-shaped flat plate 2 is formed on the inner side. If the outer surface of the bent portion 4 of the belt-shaped flat plate 2 is brought into contact with the outer surface of the bent portion 4 and these contact portions are integrally adhered to each other, a laminated oval catalyst carrier 13 for purifying exhaust gas having an oval cross section can be formed. The exhaust gas purifying laminated small-sized catalyst carrier 5 is also a laminated rectangular catalyst carrier for purifying exhaust gas. It is possible to achieve the same effect as.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an embodiment of a stacked catalyst carrier for purifying exhaust gas according to the present invention.

FIG. 2 is a cross-sectional view of another embodiment in which a part of the embodiment shown in FIG. 1 is modified.

FIG. 3 is a cross-sectional view of another embodiment of the present invention.

FIG. 4 is a cross-sectional view of still another embodiment of the present invention.

FIG. 5 is a cross-sectional view of a main part of a conventional laminated catalyst carrier for exhaust gas purification.

FIG. 6 is an exploded front view of the exhaust gas purifying laminated catalyst carrier shown in FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Laminated-type rectangular parallelepiped catalyst support for exhaust gas purification, 2 ... Strip-shaped flat plate, 3 ... Flat part, 4 ... Bent part, 5 ... Crease, 6 ... Front edge, 7 ... Envelope, 8 ... Turn part, 9 … Refolded portion, 10… band corrugated sheet, 11… top, 12… valley, 13… stacked oval catalyst for exhaust gas purification.

Claims (3)

(57) [Scope of request for utility model registration] 1. A multilayer catalyst carrier for purifying exhaust gas comprising a plurality of strip-shaped flat plates and strip-shaped corrugated sheets which are alternately superposed on each other.
The length of the bent portion bent toward the adjacent band-shaped flat plate at both ends of the band-shaped flat plate is set to a dimension longer than the interval between the adjacent band-shaped flat plates, and the tip of the bent portion is set to the bent portion. A laminated catalyst carrier for purifying exhaust gas, wherein the laminated catalyst carrier is overlapped and integrally joined on a belt-shaped flat plate adjacent to the bent side of the above. 2. The flat plate according to claim 1, wherein a front end portion of the bent portion of the band-shaped flat plate is overlapped with a base portion of the bent portion of the band-shaped flat plate adjacent to the bent side of the bent portion and integrally joined. 2. The stacked catalyst carrier for purifying exhaust gas according to claim 1. 3. The belt-shaped flat plate according to claim 1, wherein a front end of the bent portion of the band-shaped flat plate is overlapped with a flat portion of the band-shaped flat plate adjacent to the bent side of the bent portion and integrally joined. Stacked catalyst carrier for exhaust gas purification.