JPH0972214A - Wall strip for support mat in catalytic converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a front rim from wearing and tearing unduly owing to gas flow on the front rim of the supporting mat by installing a barrier strip having a tapered part to be installed on the bottom rim end of a supporting mat and a round part extending forward the tapered part, in the front rim of the supporting mat. SOLUTION: A barrier strip 31 is arranged to protect the front rim 29 of a supporting mat. The barrier strip 31 is formed of a wire mesh material, and it includes a tapered part to be installed on the bottom rim end 43 of the supporting mat, and a part for protecting the front rim 29 of the supporting mat and which extends forward the end part of a part wider than the tapered part. When the tapered part is compressed by the supporting mat 27, the round part 39 is pivotally moved slightly around the connecting part of the tapered part. The front rim 29 of the supporting mat is compressed so as to protect the front rim 29 of the supporting mat. It is thus possible to protect since the front rim 29 of the supporting mat is worn and torn unduly.

Description

Detailed Description of the Invention

The present invention relates to a catalytic device, and more particularly to a catalytic converter with a catalytic brick support mat having a barrier strip protecting the leading edge.

In catalytic converters, a support mat fixes and positions the catalytic bricks inside a chamber of the catalytic converter housing. This support mat is commercially available from, for example, 3M Company of Minneapolis, Minn.
It is formed from an expansive material such as the material sold under the tradename ERAM). The support mat occupies the space between the brick and the inner wall of the housing in the room. A problem with conventional support mats is that the leading edge of the mat (i.e., the mat edge adjacent the housing inlet) is subject to excessive wear due to hot gas flowing over the leading edge. Lead edge wear proceeds rapidly until the support mat is unable to support the brick in the housing. Thus, without proper support, the bricks can cause significant damage to the housing and stop the catalytic converter from functioning (ie, cleaning the gas produced by the vehicle engine).

A heat resistant gasket that is applied to the front edge of the brick, separate from the support mat, provides some protection to the front edge of the support mat. However, this gasket can be damaged, causing damage to the support mat.

It is an object of some of the present invention to provide a catalytic brick support mat having a barrier strip located at the leading edge and resisting excessive wear caused by the flow of hot gases over the support mat, Providing barrier strips that resist the compressive forces exerted by the support mat and bricks, providing barrier strips that do not decompose when exposed to hot gas, and prevent hot gas from contacting the support mat. It is to provide a barrier strip that is substantially protective and to provide a barrier strip that is simple to manufacture, easy to attach to a support mat and inexpensive to manufacture.

Generally speaking, the present invention is directed to a catalytic converter system of the type including a housing having a chamber, an inlet for receiving gas, and an outlet for releasing gas. The apparatus further comprises a catalytic brick disposed within the chamber to purify gas entering the chamber through the inlet, and a support mat disposed between the housing and the catalytic brick to support the catalytic brick with respect to the housing. It has and.
The support mat then has a leading edge located adjacent the inlet of the housing. Thus, the improvement according to the invention consists in providing a barrier strip which is attached to the front edge of the support mat and protects it from excessive wear due to the flow of hot gases over it.

Other objects, features and advantages of the present invention will become apparent upon considering the following description in conjunction with the accompanying drawings.

Referring to the drawings, and in particular to FIGS. 1 and 2,
A catalytic converter device for a motor vehicle (not shown) is indicated generally by the numeral 11. The device 11 comprises an elongated housing 13 formed from a metal sheet material. The housing, generally designated by the numeral 13, is a top wall 15 and a bottom wall 1.
7, and the top wall 15 and the bottom wall 17 are attached together at the periphery by any suitable means, such as welding or metal sheet screws. The top wall 15 and the bottom wall 17 form an internal chamber 19. Inlet 21 at one end of housing 13
Allows the hot gas produced by the vehicle engine (not shown) to enter the chamber 19, and the outlet 23 at the other end of the housing allows the hot gas to escape from the chamber 19.

In the chamber 19, catalytic bricks, designated by the reference numeral 25, are arranged in order to purify the hot gas entering the chamber. Each brick 25 is fixed and arranged in the chamber 19 by a support mat 27 arranged between the walls 15 and 17 of the housing 13 and the brick 25 in the chamber 19. Each support mat 27 secures the respective brick 25 in the chamber 19 of the housing 13 and prevents the bricks from moving vertically and laterally in the chamber 19. The support mat 27 is made of an expandable material (eg, 3M, Minneapolis, MN).
Material sold under the trade name "INTERAM" by the company) and expands when exposed to hot gas between the walls 15, 17 of the housing 13 and the outer surface of the brick 25. Occupy space. Each support mat 27
Is a front edge 2 located adjacent to the inlet 21 of the housing 13.
Have 9. The leading edge 29 of the support mat 27, if not protected, will be excessively worn by the flow of hot gases over it. This wear of the support mat 27 makes it impossible to support the bricks 25 by the support mat 27, in which case it is necessary to replace the catalytic converter.

To protect the leading edge 29 of the support mat 27 from excessive wear, a barrier strip, generally designated 31, is attached to said leading edge 29. Referring to FIG. 3, the barrier strip 31 comprises a body 33 formed of a wire mesh of a refractory material such as SAE309. The body 33 of the barrier strip 31 is the SAE 30
Although it can be formed from a heat resistant material other than 9, this material was selected because of its performance under compression and at high temperature. As shown in FIG. 4, the wire mesh body 33 of the barrier strip 31 includes a first layer 33A having a plurality of woven wires and a second layer 33B of woven wires on which the first layer 33A overlaps. including. The first layer of woven wire 33A comprises round wire and the second layer of woven wire 33B is flattened wire.
The round wire of the first layer 33A has a diameter of about 0.114 millimeters (0.0045 inches) and the round wire of the second layer 33B is
Flattened wire, which is formed from a 0.114 mm diameter round wire, is flattened to a thickness of about 0.0254 mm (0.001 inch). The body 33 of the barrier strip 31 is 0.114 mm (0.00
45 inch diameter outer mesh 35 made of wire
It is wrapped in (Fig. 3).

The body 33 of the barrier strip 31 is formed by wrapping a first layer 33A and a second layer 33B on a concentric tube (not shown) and applying an outer mesh 35 over the tube. . Then, the main body 33 and the outer mesh 35 are molded by a calender machine (not shown) so as to have a relatively flat portion 37 and a round portion 39. The flat portion 37 is slightly tapered as shown in FIG. After forming the barrier strip 31, this is heat treated at a temperature of about 1090 ° C. (2000 ° F.) to anneal the wire mesh. This heat treatment process forms a carbon deposit 41 (FIG. 5) on the wire mesh.
Acts as a leak barrier strip that prevents contact with 7.

As shown in FIGS. 6 and 7, the flat portion 37 of the body of the barrier strip 31 is attached to the bottom edge 43 of the support mat 27 by an adhesive (not shown) and the rounded portion 39 is tapered. Extending forward of the wide end of the flattened flattened portion 37 protects the front edge 29 of the support mat. The support mat 27 and barrier strip 31 are then form-fit on the brick 25 in a conventional manner. Each brick 25 is arranged on the bottom wall 17 of the housing 13 and is housed in a chamber 19 of the housing by attaching the top wall 15 to the bottom wall 17, for example by welding.

During use, the hot gas generated by the engine of the vehicle flows into the chamber 19 through the inlet 21.
This hot gas expands the support mat 27 and fixes the brick 25 in the chamber 19. The hot gas melts the adhesive between the barrier strip 31 and the support mat 27, while the barrier strip 31 is held in place by the compressive force generated by the support mat 27. The taper of the flattened portion 37 secures the barrier strip 31 to the support mat 27 (i.e., the barrier strip is secured in an integral position with the support mat). The tapered flattened portion 37 also slightly pivots the rounded portion 39 clockwise (as seen in FIG. 2) about the connection of the rounded portion 39 to the flattened portion 37, in front of the support mat 27. Protect the rim 29. Thus, the barrier strips 31 prevent hot gas from contacting the leading edge of the support mat 27 and prevent hot gas from entering the space between the support mat 27 and the housing 13, as shown. Protects the support mat 27 from excessive wear on its leading edge 29.

The barrier strip 31 may also be used in other applications where the leading edge of the fabric material needs to be protected from excessive wear caused by hot gases flowing over the material.

Although a specific structure according to the present invention has been described above, it will be apparent to those skilled in the art that various modifications and reconfigurations can be made without departing from the spirit of the present invention and the underlying inventive idea. The present invention is not limited to the specific embodiments shown and described herein, provided that they fall within the scope of the appended claims.

[Brief description of drawings]

FIG. 1 is a perspective view of a catalytic converter apparatus shown partially broken away to show a barrier strip for a catalytic brick support mat according to the present invention.

2 is a cross-sectional view taken along line 2-2 of FIG.

FIG. 3 is a cross-sectional view of a barrier strip attached to a support mat.

FIG. 4 is a perspective view showing a first layer and a second layer of woven wire that make up the body of the barrier strip.

FIG. 5 is an enlarged view of a barrier strip.

FIG. 6 is a perspective view of a barrier strip and a support mat.

FIG. 7 is an exploded perspective view of a barrier strip and a support mat.

[Explanation of symbols]

 11 Catalytic Converter Device 13 Housing 19 Chamber 21 Housing Inlet 23 Housing Outlet 25 Catalytic Brick 27 Support Mat 29 Front Edge of Support Mat 31 Barrier Strip 33A First Layer 33B Second Layer 37 Flat Part 39 Rounded Part 41 Carbon Deposit 43 Bottom edge of support mat

Claims (7)

[Claims] 1. A housing having a chamber, an inlet for receiving a gas, and an outlet for releasing the gas; a catalyst disposed inside the chamber to purify the gas entering the chamber through the inlet. A catalyst having a brick and a support mat disposed between the housing and the catalyst brick to support the catalyst brick to the housing, the support mat having a leading edge located adjacent the inlet of the housing. In the converter device, there is provided a barrier strip attached to the leading edge of the support mat to protect the leading edge from excessive wear due to gas flowing over the leading edge, the barrier strip being formed from a wire mesh material and A taper portion attached to the bottom edge of the support mat and extending forward of the wider end of the taper portion A substantially rounded portion that protects the leading edge of the support mat, the tapered portion connecting the rounded portion to the tapered portion when compressed by the support mat. A catalytic converter device, characterized in that it is pivoted slightly around the part and thus compressed against the front edge of the support mat to protect the front edge of the support mat. 2. The catalytic converter device of claim 1, wherein the barrier strip comprises a refractory material. 3. The catalytic converter system of claim 1, wherein the barrier strip comprises a wire mesh. 4. The catalytic converter device of claim 3, wherein the wire mesh comprises a first layer having a plurality of woven wires and a second layer having a plurality of woven wires. 5. The catalytic converter apparatus of claim 4, wherein the first layer comprises round wire and the second layer comprises flat wire. 6. The catalytic converter apparatus of claim 3, wherein the wire mesh includes a carbon deposit that substantially prevents hot gases from contacting the support mat. 7. The catalytic converter device of claim 1, wherein the flat portion of the barrier strip is integral with the support mat.