JPH04105928U - Metal catalyst carrier structure for exhaust gas purification - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a metal catalyst carrier structure for exhaust gas purification that has excellent durability and high productivity with little deformation and displacement due to high temperatures. [Structure] Both side parts 2d, bordering on the center part 2a of the belt-shaped flat plate 2,
An exhaust gas characterized in that a metal catalyst carrier in which corrugated plates 3 and 4 are brazed to different sides of 2e is wound around the center part 2a with both sides 2d and 2e overlapping each other to form a spiral shape. Metal catalyst support structure for purification.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is based on the metal catalyst support of the catalytic converter that purifies exhaust gas in internal combustion engines. Regarding body structure.

0002

[Prior art]

Combustion gas contained in the exhaust pipe path of an internal combustion engine and discharged to the outside from the engine Catalytic converters purify platinum, rhodium, rare earth metals, cesium, etc. supports metal catalysts to eliminate CO, HC, NOx, SOx, etc. when exhaust gas passes through. Absorbs and purifies harmful ingredients.

0003 The monolithic metal catalyst carrier is made by overlapping strip-shaped flat plates and corrugated plates to create a spiral shape. There are some that are rolled up to form a honeycomb-shaped cylinder as a whole.

0004 A general example of this is described in Japanese Patent Application Laid-Open No. 59-162317. The structure is shown in Figure 4. Figure 4 shows a process of forming the structure of the metal catalyst carrier. The structure of the body consists of alternating layers of flat strips 01 and corrugated plates 02, with the core material at the center. It is formed into a spiral shape by winding it multiple times.

[0005] It has the advantage of being easily manufactured by winding the flat plate 01 and the corrugated plate 02.

[0006] The above structure had one vortex center, but there are other examples with two or more vortex centers. be. Figure 5 is a diagram schematically showing an example of this (corrugated plates are omitted). The flat plates 010 and 011 extending from the cores 010a and 011b are connected to each other with a partition plate 012 interposed between them. It wraps around itself to form a spiral shape.

[0007] Partition plate 012 is a continuous material with no breaks, which prevents it from deforming or shifting due to high temperatures. It has stopped. An example of having a plurality of such vortex centers is JP-A-62-273051.

[0008]

[Issue to be solved]

However, the former case with one vortex center is easy to manufacture, but the spiral structure It is difficult to fix, and the spiral-shaped center called scoping protrudes. This phenomenon is likely to occur. Further, although the spiral structure is housed in an outer cylinder, it is difficult to fix it to the outer cylinder.

[0009] In the latter case, when there are two or more vortex centers, multiple flat plates or corrugated plates are swirled through a partition plate. The drawback is that the manufacturing process is complicated and cannot be easily manufactured because it has to be wound in a circular shape.

0010 This invention was devised in view of these points, and its purpose is to make it easy to manufacture. The object of the present invention is to provide a metal catalyst carrier structure that does not deform under high temperatures and has excellent durability.

[0011]

[Means and actions for solving the problem]

In order to achieve the above purpose, the present invention has been developed so that the sides of the belt-shaped flat plate are mutually separated from each other at the center of the plate. A metal catalyst carrier with a corrugated plate brazed on one side, which is different from the other A metal catalyst carrier structure for exhaust gas purification that is wound overlappingly to form a spiral shape. And so.

0012 Two corrugated plates are brazed to one continuous flat plate and wound around the center. It has a spiral shape and is extremely easy to manufacture, as well as being continuous and flat. Since it uses a plate, it is less deformed or misaligned even by high-temperature exhaust gas, and is durable. Are better.

[0013]

【Example】

An embodiment of the present invention illustrated in FIGS. 1 to 3 will be described below. FIG. 1 is a front view of the metal catalyst carrier 1 of this example.

[0014] The central part 2a of one continuous strip-shaped flat plate 2 is slightly flat, and both edges 2b , 2c, both side portions 2d and 2e extend in a spiral manner in the same direction. On one side of the flat plate 2, which is different from the center of the plate 2, the contact parts are brazed. The corrugated plate 3 attached to one side of the flat plate is attached to the side of the other flat plate. The space between the two sides of the flat plate is finely partitioned to form a honeycomb shape. The element thus formed into a spiral shape is fitted into a cylindrical outer tube 5. .

[0015] Since both sides 2d and 2e of the flat plate 2 are wound around each other to form a spiral shape, the bent portion 2b , 2c is considered to be the center of the vortex, and because it is wound around a single continuous flat plate, it appears to be inside the vortex. It also has the properties of a single mind, and has the best of both worlds.

[0016] In other words, the production of this metal catalyst carrier 1 is similar to the production of a metal catalyst carrier with one vortex center. is extremely simple, as shown in Figure 2, first unfold the strip plate 2 to the left and right, and then Corrugated plates 3 and 4 are soldered to different sides of both sides 2d and 2e, respectively, with part 2a as a boundary. Form an element.

[0017] Place the elements expanded to the left and right in this way vertically on the horizontal base 10. Then, the center portion 2a of the flat plate 2 is positioned above the circular hole 11 bored in the horizontal base 10. A cylindrical winding jig 12 is arranged above the circular hole 11. , whose outer diameter is approximately equal to the width of the central part 2a of the flat plate 2, and from the lower end along the plane passing through the central axis. A notch 13 is formed upward with a length equal to or longer than the vertical width of the flat plate 2.

[0018] The winding jig 12 is lowered from above, and the central part 2a of the flat plate 2 is inserted into the notch 13. Then, insert the lower end of the winding jig 12 into the circular hole 11 of the horizontal base 10 so that it can rotate freely. The left and right ends of the element should be tensioned with appropriate force to hold the element. It is expanding.

[0019] When the winding jig 12 is rotated counterclockwise when viewed from above in this state, the winding jig 12 The central part 2a of the flat plate 2 inside 12 remains flat, and both edges 2b and 2c are bent. Both edges 2b, 2c are drawn in on both sides 2d, 2e, which are outside the notch 13, to form both sides 2d. , 2e are wound around the outer periphery of the winding jig 12, and then one flat plate 2b, 2c is wrapped around the other corrugated plate 4, It wraps around 3 and naturally forms a spiral.

[0020] When the winding is finished, temporarily fasten the edges of the side parts 2d and 2e of the flat plate 2, and fit it into the outer cylinder 5. Then, remove the winding jig 12. The element and the outer cylinder 5 are fixed by brazing appropriately at the main circumferential parts where they contact each other. Thus, the structure of the metal catalyst carrier 1 shown in FIG. 1 is completed.

[0021] Since one continuous flat plate 2 is wound in this way, it is always wound at the same time without any misalignment. One-quality products can be easily produced. One rotation of the winding jig 12 causes one winding on each side of the element, so the overall Since it requires two rolls, production efficiency is good.

[0022] A spiral element has one side of it clamping the other side together. Therefore, so-called scoping, in which the vortex center protrudes, can be prevented.

[0023] Also, since the element is made by winding one continuous flat plate 2, it can withstand high temperatures. Even when exposed to exhaust gas, it does not deform or shift, improving durability.

[0024]

[Effect of the idea]

This invention consists of a continuous flat plate that is wound around the center to form a spiral shape. As a result, productivity is extremely high and no deviation occurs even at high temperatures. It has excellent durability.

[Brief explanation of drawings]

FIG. 1 is a front view showing the structure of a metal catalyst carrier according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a process of forming the structure of the metal catalyst carrier.

FIG. 3 is a perspective view showing another process.

FIG. 4 is a perspective view showing a process of forming a conventional metal catalyst carrier structure.

FIG. 5 is a partially omitted front view showing another conventional metal catalyst carrier structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1...Metal catalyst carrier, 2...Flat plate, 3, 4...Corrugated plate, 5...Outer tube, 10...Horizontal base, 11...Circular hole, 12...Winding jig, 13...Notch.

Claims (1)

[Scope of utility model registration request] [Claim 1] A metal catalyst carrier comprising a band-shaped flat plate with corrugated plates brazed to different sides on both sides of the center of the plate,
A metal catalyst carrier structure for exhaust gas purification characterized by having both sides overlapped with each other around a central part to form a spiral shape.