JPH0596425U - Metal catalytic converter - Google Patents

Abstract

(57) [Abstract] [Object] The present invention relates to a catalytic converter mounted on an automobile, an industrial vehicle or the like for purifying exhaust gas, and more particularly to a metal catalytic converter in which a catalyst carrier is formed of metal, An object of the present invention is to reliably prevent exhaust gas from bypassing between the interram mat and the metal catalyst carrier. The metal catalyst carrier 47 is housed in a cylindrical container 41, and an interram mat 63 is arranged between the cylindrical container 41 and the metal catalyst carrier 47. The concave portion 65 formed on the outer side of is filled with a ceramic adhesive 67.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a catalyst converter mounted on an automobile, an industrial vehicle or the like for purifying exhaust gas, and more particularly to a metal catalytic converter in which a catalyst carrier is made of metal.

[0002]

[Prior Art]

 Generally, a catalytic converter is arranged in the exhaust system of an automobile in order to purify the exhaust gas.However, in such a catalytic converter, the catalyst is not activated when the temperature of the catalyst carrier is low, so that the engine is not activated. At the time of starting, there was a problem that it was difficult to sufficiently purify the exhaust gas.

Therefore, conventionally, for example, as disclosed in Japanese Patent Application Laid-Open No. 3-245851, a metal catalyst has a low temperature of a catalyst carrier and is electrically heated to heat a catalyst carrier at the time of starting an engine or the like. Converters are being developed.

FIGS. 6 and 7 show a metal catalytic converter of this kind. In these drawings, reference numeral 11 indicates a cylindrical container. An exhaust gas inlet 13 is formed on one side of the cylindrical container 11, and an outlet 15 is formed on the other side.

A metal catalyst carrier 17 is housed in the center of the cylindrical container 11. The metal catalyst carrier 17 is formed by bending and stacking a single strip 19.

An insulating layer 21 is formed between the adjacent strips 19. As shown in FIG. 8, the strip 19 is formed by laminating a metal corrugated plate 23, which is a catalyst carrier, and a flat plate 25.

Then, a pair of electrodes 27, 29 is arranged at the end portions of the strip-shaped body 19, and these electrodes 27, 29 are welded to the flat plate 25 located outside the strip-shaped body 19. It is fixed.

Further, as shown in FIG. 7, both sides of the metal catalyst carrier 17 are supported by a cushioning material 31 to prevent exhaust gas bypass between the metal catalyst carrier 17 and the cylindrical container 11. The interram mat 33 of FIG.

In such a metal catalytic converter, when a voltage is applied between the electrode 27 on one side and the electrode 29 on the other side, the strip 19 is energized, and the strip 19 generates heat due to the electrical resistance of the strip 19. To be done.

[0010]

[Problems to be solved by the device]

 However, in such a metal catalyst converter, since the metal catalyst carrier 17 is formed by bending the belt-shaped body 19, as shown in FIG. A relatively large recess 35 is formed, and a gap 37 is formed between the metal catalyst carrier 17 and the interram 33, and the exhaust gas may bypass from the gap 37.

Therefore, it has been attempted to increase the thickness of the interram mat 33, enhance the adhesion between the metal catalyst carrier 17 and the intermat 33, and eliminate the gap portion 37. In this case, In the concave portion 35, when the pressure bonding force between the metal catalyst carrier 17 and the interram mat 33 decreases, and the exhaust gas flows into this portion, the interram mat 33 may scatter and the exhaust gas may bypass.

The present invention has been made to solve the above-mentioned conventional problems, and can reliably prevent the exhaust gas from bypassing between the interim mat and the metal catalyst carrier. The purpose is to provide.

[0013]

[Means for Solving the Problems]

 The metal catalyst converter according to the present invention is a metal catalyst converter in which a metal catalyst carrier is housed in a cylindrical container, and an interram mat is arranged between the cylinder container and the metal catalyst carrier. The concave portion formed on the outer side of is filled with a ceramic adhesive.

[0014]

[Action]

 In the metal catalyst converter of the present invention, the concave portion formed on the outside of the metal catalyst carrier is filled with the ceramic adhesive, so that the outer shape of the metal catalyst carrier becomes smooth and the adhesion force of the inner mat is entirely uniform. become.

[0015]

【Example】

 The present invention will now be described in detail with reference to an embodiment shown in the drawings. 1 and 2 show one embodiment of the metal catalytic converter of the present invention, in which the reference numeral 41 denotes a tubular container which is divided into two in the middle.

An exhaust gas inlet 43 is formed on one side of the cylindrical container 41, and an outlet 45 is formed on the other side. The metal catalyst carrier 47 is housed in the center of the cylindrical container 41.

The metal catalyst carrier 47 is formed by bending and stacking a single strip 49. An insulating layer 51 is formed between the adjacent strips 49.

As shown in FIG. 3, the strip 49 is formed by laminating a corrugated metal plate 53, which is a catalyst carrier, and a flat plate 55. A pair of electrodes 57 and 59 are arranged at both ends of the strip 49, and these electrodes 57 and 59 are fixed to the flat plate 55 located outside the strip 49 by welding or the like. There is.

Further, as shown in FIG. 2, both sides of the metal catalyst carrier 47 are supported by a cushioning material 61, and an exhaust gas bypass is prevented between the metal catalyst carrier 47 and the cylindrical container 41. An interram mat 63 for stopping is arranged.

In this embodiment, however, the concave portion 65 formed outside the metal catalyst carrier 47 is filled with the ceramic adhesive 67. The ceramic adhesive 67 is a heat-resistant inorganic adhesive containing silica, alumina or the like as a main component, and for example, Sumiceram S (trade name of Asahi Chemical Industry Co., Ltd.) is used.

The Sumiceram S withstands a high temperature of 1000 to 2000 ° C., is hardened at a low temperature of 100 to 300 ° C., and has a strong adhesive force to most inorganic materials. In addition, the adhesive layer after curing is ceramic-like, has high hardness, does not generate gas due to temperature rise after curing, is harmless, and has excellent organic chemical resistance. have.

In this example, Sumicelam S-18C whose main component was silica was used. In the metal catalyst converter described above, the concave portion 65 formed on the outer side of the metal catalyst carrier 47 is filled with the ceramic adhesive 67, and then the inter-layer mat 63 is fitted on the outer side of the metal catalyst carrier 47 to form the cylindrical container 41 Manufactured by housing inside.

When a voltage is applied between the electrode 57 on one side and the electrode 59 on the other side, the flat plate 55 and the corrugated plate 53 are energized, and the flat plate 55 and the corrugated plate 53 are electrically connected to each other so that the flat plate 55 and the corrugated plate 53 are electrically connected. The corrugated plate 53 generates heat.

In the metal catalyst converter configured as described above, the concave portion 65 formed outside the metal catalyst carrier 47 is filled with the ceramic adhesive 67, so that the outer shape of the metal catalyst carrier 47 becomes smooth. It is possible to reliably prevent the exhaust gas from bypassing between the interram mat 63 and the metal catalyst carrier 47.

Further, since the adhesion force of the interram mat 63 becomes uniform as a whole, it is possible to surely prevent the interram mat 63 from scattering. FIG. 4 shows another embodiment of the present invention. In this embodiment, a ceramic adhesive 67 is arranged outside the metal catalyst carrier 47 to cover the whole metal catalyst carrier 47. ..

In this metal catalytic converter, it is possible to obtain almost the same effect as in the above-mentioned embodiment, but in this embodiment, the ceramic adhesive 67 is arranged so as to cover the entire metal catalyst carrier 47, Due to the insulating property of the ceramic adhesive 67, the insulating property between the cylindrical container 41 and the metal catalyst carrier 47 can be improved, and the insulating property of the ceramic adhesive 67 improves the cylindrical container 41. It can prevent high temperature.

In addition, in the above-mentioned embodiment, an example in which the present invention is applied to an electric heating type metal catalyst converter has been described, but the present invention is not limited to such an embodiment, and a metal catalyst carrier may be used. Of course, it can also be applied to a normal metal catalytic converter that is not heated by electricity.

Further, in the above-mentioned embodiment, the example in which the present invention is applied to the metal catalyst carrier 47 in which the strip 49 is bent and laminated is explained, but the present invention is not limited to such an embodiment. Instead, for example, as shown in FIG. 5, the ceramic adhesive 67 is filled outside the recess 71 formed at the end of the metal catalyst carrier 69 formed by winding the corrugated plate 53 and the flat plate 55. Therefore, it goes without saying that the same can be applied to the treatment of the concave portion 71.

[0029]

[Effect of the device]

 As described above, in the metal catalyst converter of the present invention, the concave portion formed on the outer side of the metal catalyst carrier is filled with the ceramic adhesive, so that the outer shape of the metal catalyst carrier becomes smooth and the contact of the interram mat adheres. Since the force becomes uniform throughout, there is an advantage in that it is possible to reliably prevent the exhaust gas from bypassing between the intermediary mat and the metal catalyst carrier.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line I-I of FIG.

FIG. 2 is a sectional view showing an embodiment of the metal catalytic converter of the present invention.

3 is a perspective view showing an upper portion of the metal catalytic converter of FIG. 1. FIG.

FIG. 4 is a sectional view showing another embodiment of the metal catalytic converter of the present invention.

FIG. 5 is a sectional view showing still another embodiment of the metal catalytic converter of the present invention.

FIG. 6 is a sectional view showing an example of a conventional metal catalytic converter.

7 is a cross-sectional view showing the metal catalytic converter of FIG.

8 is a perspective view showing an upper portion of the metal catalytic converter of FIG.

[Explanation of symbols]

 41 Cylindrical container 47 Metal catalyst carrier 63 Interram mat 65 Recess 67 Ceramic adhesive

Claims (1)

[Scope of utility model registration request] 1. A metal catalyst carrier (4) in a cylindrical container (41).
In the metal catalytic converter, which accommodates 7) and has an interram mat (63) arranged between the cylindrical container (41) and the metal catalyst carrier (47), the metal catalyst carrier is provided outside the metal catalyst carrier (47). A metal catalytic converter characterized in that the formed recess (65) is filled with a ceramic adhesive (67).