JP2008104918A - Metal catalyst carrier and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal catalyst carrier and its manufacturing method which can improve durability by increasing the rigidity of an edge part of piled up long pitch corrugated plates and short pitch corrugated plates or flat plates, protruded in the center hole of the metal catalyst carrier. <P>SOLUTION: Two pairs of thin metal corrugated plates 11 and flat plates 12 are alternately piled up, and multiply wound around the outer periphery of a winding core 2 while inserting the edge part into a slit 21 formed in the winding core 2, thereby forming a honeycomb structure having a number of cell passages passing exhaust gas, between the corrugated plate 11 and the flat plate 21. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a metal catalyst carrier and a method for producing a metal catalyst carrier.

As a conventional metal catalyst carrier, a pair of large corrugated metal plates and small corrugated plates or flat plates are overlapped, and the outer periphery of the core is inserted into an insertion groove or slit formed on the core. There is known a structure formed in a honeycomb shape having a large number of cell passages through which exhaust gas passes between each of the large corrugated plates and the small corrugated plates or flat plates (see, for example, Patent Document 1). .)
JP 2005-313082 A

  However, since the catalyst carrier of the conventional example is configured as described above, by removing the winding core from the metallic catalyst carrier wound around the winding core, the central part of the metallic catalyst carrier is formed. A large hole is formed, and the center hole is in a state in which the end portion where a pair of a large wave plate and a small wave plate or a flat plate inserted into the insertion groove of the winding core protrudes, and thus has low rigidity and durability. There is a problem in terms of.

  In particular, in recent years, exhaust gas purification regulations have become stricter, and in order to cope with this, the catalytic converter has been arranged directly under the manifold with severe heat load, so that the tip of the catalytic converter is placed in the center hole of the metal catalyst carrier. A large external force (force that pushes down) acts on the edge of a pair of large wave plate and small wave plate or flat plate that are in a floating state, which may cause damage. There is a problem.

  The problem to be solved by the present invention is to improve the durability by increasing the rigidity of the edge portion where the large wave plate and the small wave plate or flat plate in a state of protruding into the center hole of the metal catalyst carrier are overlapped. Another object of the present invention is to provide a metal catalyst carrier and a method for producing the metal catalyst carrier.

  In order to solve the above-mentioned problem, a metal catalyst carrier according to claim 1 is provided with an insertion groove formed by alternately stacking two or more pairs of a large corrugated plate and a small corrugated plate or a flat plate of metal, and having an edge portion as a winding core. It is formed in a honeycomb shape having a large number of cell passages through which exhaust gas passes between each of the large wave plates and the small wave plates or flat plates by being wound around the outer periphery of the winding core while being inserted into the slit. A feature means.

  According to a second aspect of the present invention, there is provided a method for producing a metal catalyst carrier, wherein two or more pairs of large metal corrugated plates and small corrugated plates or flat plates are alternately stacked and the end edges thereof are formed in insertion grooves or slits formed on a winding core. It is characterized in that it is formed in a honeycomb shape having a large number of cell passages through which exhaust gas passes between each of the large wave plate and the small wave plate or flat plate by being wound around the outer periphery of the winding core while being inserted. As a means.

  In the method for producing the metal catalyst carrier according to claim 1 and the metal catalyst carrier according to claim 2, as described above, two or more pairs of metal corrugated plates and corrugated plates or plates are alternately stacked, and the ends thereof Numerous cells through which exhaust gas passes between each corrugated plate and the corrugated plate or flat plate by being wound around the outer periphery of the core while being inserted into an insertion groove or slit formed in the core. By forming it into a honeycomb shape having passages, it becomes an edge portion in which two or more pairs of large wave plates and small wave plates or flat plates projecting into the center hole of the metal catalyst carrier are stacked. The rigidity of this part can be increased.

  In addition, since the clearance area of the center hole is reduced, the flow rate of the exhaust gas flowing through the center hole is reduced, thereby reducing the external force acting on the edge portion.

Therefore, it is possible to improve the durability of the metal catalyst carrier.
In addition, it is possible to reduce the number of rotations of the winding core by winding it around the outer circumference of the winding core in a state where two or more pairs of metal large and small corrugated plates or flat plates are alternately stacked. Efficiency can be increased.

  Embodiments of the present invention will be described below with reference to the drawings.

  The metal catalyst carrier of this example corresponds to the inventions described in claims 1 and 2.

  First, the metal catalyst carrier of this embodiment will be described with reference to the drawings.

  FIG. 1 is a plan view showing a metal catalyst carrier of this embodiment, and FIG. 2 is a perspective view showing a state in the middle of winding a corrugated plate and a flat plate.

The metal catalyst carrier 1 of this embodiment is a honeycomb structure in which corrugated plates (large corrugated plates) 11 and flat plates (small corrugated plates or flat plates) 12 of 30 μm thin metal plates are alternately stacked, and the plates 12 are wound outwardly. A catalyst component (Pt or the like) is supported on a catalyst carrier layer made of alumina or the like on the surface of the honeycomb passage (cell passage), thereby forming an exhaust gas purification catalyst. And, by arranging in the exhaust path of the internal combustion engine, harmful substances (HC, CO, NOx, etc.) in the exhaust gas are purified by catalytic reaction and discharged as harmless substances (H ₂ O, CO ₂ , N ₂ ). To work.

  In this embodiment, as shown in FIG. 2, two pairs of metal thin corrugated plates 11 and flat plates 12 are alternately stacked, and the edge portions thereof are inserted into slits 21 formed in the core 2. Then, after the winding core 2 is rotated in the direction of the arrow to wrap around the outer periphery of the winding core 2 in a multiple manner, the winding core 2 is pulled out, and as shown in FIG. Are formed in a honeycomb-shaped metal catalyst carrier 1 having a large number of cell passages through which exhaust gas passes.

Next, functions and effects of the embodiment will be described.
In the metal catalyst carrier of this embodiment, as described above, two pairs of metal thin corrugated plates 11 and flat plates 12 are alternately stacked and the edge portions thereof are inserted into the slits 21 formed in the winding core 2. In this state, the metal catalyst carrier 1 is formed into a honeycomb shape having a large number of cell passages through which exhaust gas passes between the corrugated plate 11 and the flat plate 12 by being wound around the outer periphery of the core 2. By forming the end edge portion 14 in a state where two or more pairs of the corrugated plate 11 and the flat plate 12 in a state of projecting into the end portion 13 are overlapped, the rigidity of the end edge portion 14 is increased.

  Further, since the clearance area of the center hole 13 is reduced, the flow rate of the exhaust gas flowing through the center hole 13 is reduced, and thereby the external force acting on the end edge portion 14 is reduced.

Therefore, the effect that the durability of the metal catalyst carrier 1 can be improved is obtained.
In addition, the number of rotations of the core 2 can be reduced by winding the metal corrugated sheet 11 and the flat plate 12 around the outer periphery of the core 2 in a state where two pairs are alternately stacked. Work efficiency can be improved.

  Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within the scope not departing from the gist of the present invention are included in the present invention.

  For example, in the embodiment, the flat plate 12 is wound outside, but the corrugated plate 11 may be arranged outside.

  In the embodiment, it is inserted into the slit 21 formed in the winding core 2, but it may be inserted into the groove.

  Further, a plurality of slit holes may be formed in the corrugated plate 11 and the flat plate 12 with a predetermined length at a predetermined interval in advance before forming into a corrugated shape.

It is a top view which shows the metal catalyst carrier of an Example. It is a perspective view which shows the state in the middle of winding up a corrugated sheet and a flat plate.

Explanation of symbols

1 Metal catalyst carrier 11 Corrugated plate (large corrugated plate)
12 Flat plate (wave plate or flat plate)
2 Winding core 21 Slit 13 Center hole 14 Edge

Claims (2)

  Two or more pairs of large corrugated metal plates and small corrugated plates or flat plates made of metal are alternately stacked, and the edges are inserted into insertion grooves or slits formed on the core, and then wound around the outer periphery of the core. A metal catalyst carrier characterized in that it is formed in a honeycomb shape having a large number of cell passages through which exhaust gas passes between each large wave plate and the small wave plate or flat plate.   Two or more pairs of large corrugated metal plates and small corrugated plates or flat plates made of metal are alternately stacked, and the edges are inserted into insertion grooves or slits formed on the core, and then wound around the outer periphery of the core. A method for producing a metal catalyst carrier, characterized in that it is formed in a honeycomb shape having a large number of cell passages through which exhaust gas passes between each large wave plate and the small wave plate or flat plate.

Images