JP2569421Y2 - Exhaust converter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust converter, and more particularly to a shape of a case for accommodating a catalyst carrier.

[0002]

2. Description of the Related Art A conventional exhaust converter will be described with reference to the drawings. FIG. 2 is an assembly configuration diagram of a conventional exhaust converter.

As shown in FIG. 2 (a), first, elasticity is provided from the upstream side of the exhaust gas around the side surface 1a of the catalyst carrier 1 formed in a drum shape through which the exhaust gas flowing in the direction of the arrow a flows. A support ring 2, a seal mat 3, a corrugated mesh 4, and a spacer ring 5 are formed in this order, and the cases 50, 51 are fitted therein. The catalyst carrier 1 is pressed in the direction of arrow a while being pressed inward in the direction.

Then, the spacer ring 5 is connected to the case 50,
After being formed as shown in FIG. 2 (b) by pressing against the storage rear ends 50c and 51c for storing the catalyst carrier 1 of 51, the flanges 50f and 51f of the cases 50 and 51 are welded to form an exhaust converter. Make up.

[0005]

However, in the above-described conventional exhaust converter, as shown in FIG. 2B, the front end face 1b of the catalyst carrier 1 and the storage front ends 50b and 50b of the cases 50 and 51 are arranged.
Since the distance c from the storage space 51b is the same as that of the storage central portions 50a and 51a and is formed to be wide, the exhaust gas directly hits the support ring 2 to degrade the support ring 2, or the support ring is compressed by the gas pressure of the exhaust gas. 2 moves downstream of the exhaust gas.

An object of the present invention is to make the storage front ends 50b, 51b of the cases 50, 51 for storing the catalyst carrier 1 into a shape having a step so that the storage front ends 50b, 51b of the cases 50, 51 and the catalyst carrier 1 are formed. The distance between the support ring 2 and the front end surface 1b of the support ring 2 is made smaller gradually in a stepwise manner to prevent the deterioration of the support ring 2 and the movement of the support ring 2 due to exhaust gas.

[0007]

An exhaust converter according to the present invention is an exhaust converter having a case for accommodating a catalyst carrier, wherein one end of the catalyst carrier in an exhaust gas upstream direction is held, and the catalyst carrier is attached to the case. And the support member is entirely formed between the outer peripheral surface of the catalyst carrier and the inner peripheral surface of the case, and a step portion is formed in a portion of the case that comes into contact with the support member. The above problem is solved by forming an exhaust converter in which the projecting portion of the step portion in the direction of the catalyst carrier is close to the end of the catalyst carrier to protect the support member from exhaust gas from upstream. .

[0008]

Since the exhaust converter according to the present invention is constructed as described above, the step of the abutting portion abutting on the support member of the case narrows the passage through which the exhaust gas flows into the support member, thereby reducing the amount of the support. The exhaust pressure of the exhaust gas directly hitting the member can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the exhaust converter according to the present invention will be described in detail with reference to the drawings. FIGS. 1A and 1B are assembly views of the present invention.

1 (a) and 1 (b), a drum-shaped catalyst carrier 1 circulates an exhaust gas flowing in the direction of an arrow a to purify harmful components in the exhaust gas and remove them as harmless components in the atmosphere. For release to

Cases 6 and 7 for accommodating the catalyst carrier 1
Is composed of two divided members, and has storage portions 6a and 7a for storing the catalyst carrier 1, and a connection having a smaller diameter than the storage portions 6a and 7a and connected to the exhaust manifold pipe side. It has ends 6d, 7d and connecting ends 6e, 7e, etc., which are smaller in diameter than the storage sections 6a, 7a and are connected to the muffler side.

Around the side surface 1a of the catalyst carrier 1, a support ring 2, a seal mat 3, a corrugated mesh 4, and a spacer ring 5, which are support members in this order from the upstream side of the exhaust gas, are arranged and fixed at predetermined positions, respectively. Is done.
Each of the support ring 2 to the spacer ring 5 is configured to have a predetermined elasticity. When the support ring 2 to the spacer ring 5 are accommodated in the cases 6 and 7, they expand and contract appropriately to move the catalyst carrier 1 to the case 6.
7 to be held at a predetermined position.

The support ring 2, the seal mat 3, and the corrugated mesh 4 are each formed in a ring shape, and the respective inner surfaces thereof abut the side surface 1a of the catalyst carrier 1.
The outer surface of the support ring 2 is in contact with the front end portions 6b and 7b of the cases 6 and 7, and the outer surfaces of the seal mat 3 and the corrugated mesh 4 are the central portions 6 and 7 of the cases 6 and 7, respectively.
a, 7a.

The spacer ring 5 has a cut surface formed in an L-shaped ring shape.
Abuts against the side surface 1a and the rear end surface 1c, and the outer surfaces
Is configured to come into contact with the rear end portions 6c and 7c.

The storage front ends 6b and 7b, which form part of the cases 6 and 7, are connected to the connection ends 6d and 7d and have a low step portion having a small diameter and a storage central portion 6a and 7a. Cases 6 and 7 are composed of two central steps 6a and 7 which are connected to each other and have a high step section having a large diameter.
From a to the connection ends 6d and 7d, the diameter is gradually reduced.

Therefore, when the catalyst carrier 1 is accommodated in the cases 6 and 7, the step portion supports the support ring 2 as shown in FIG.
Is pressed in the radial direction of the catalyst carrier 1 while pushing in the direction of arrow a, so that the support ring 2 does not move in a direction opposite to the arrow a from a predetermined position on the side surface 1a of the catalyst carrier 1.

The storage rear ends 6c and 7c, which constitute a part of the cases 6 and 7, have a substantially L-shaped cross section so that they come into contact with the spacer ring 5 and the outer surface of the flange 5a. Is configured.

Therefore, when the catalyst carrier 1 is housed in the cases 6 and 7, the housing rear ends 6c and 7c abut on the spacer ring 5 and the brim portion 5a, and the catalyst carrier 1 is moved in FIG.
The catalyst carrier 1 can be held at a predetermined position by pressing in the direction opposite to the arrow a in FIG.

When assembling the exhaust converter constructed as described above, first, as shown in FIG.
The support ring 2, the seal mat 3, the corrugated mesh 4, and the spacer ring 5 are fixed at predetermined positions around the side surface 1a of the
The cartridges are set in such a manner that they are shifted by a predetermined distance from the storage positions a and 7a in the direction opposite to the arrow a in FIG.

Next, while pressing the cases 6 and 7 radially inward of the catalyst carrier 1, the catalyst carrier 1 is pressed and moved in the direction of the arrow a with respect to the cases 6 and 7 so that the support ring 2 and the seal mat 3 are moved. The corrugated mesh 4 and the spacer ring 5 are contracted inward in the radial direction, and the flange 5a of the spacer ring 5 is contracted in the axial direction of the catalyst carrier 1 to press the cases 6 and 7 against each other as shown in FIG. Together
The flanges 6f and 7f of the cases 6 and 7 are welded to complete the exhaust converter.

In this embodiment, the front end face 1b of the catalyst carrier 1 is
The space c between the front end portions 6b and 7b of the cases 6 and 7 is formed with a two-stepped portion as described above, and is configured to have a smaller diameter stepwise from the diameter of the storage central portions 6a and 7a. I have.

Therefore, the flow path through which the exhaust gas flows into the support ring 2 is made narrower than in the prior art, so that the support ring 2 is less likely to be directly hit by the exhaust gas, and the life of the support ring 2 is extended. It can be extended. Further, there is no possibility that the support ring 2 moves to the downstream side of the exhaust gas due to the gas pressure of the exhaust gas.

In this embodiment, the storage front end 6 of the cases 6 and 7 is used.
Although b and 7b are composed of two steps, they can be composed of other plural steps.

[0024]

Since the exhaust converter according to the present invention has the above-described configuration and operation, the exhaust gas is supported by forming the contact portion with which the support member of the case comes into contact with a stepped shape. It is possible to reduce the possibility of direct hitting, maintain the life of the support member for a long time, and prevent the support member from moving due to the gas pressure of the exhaust gas.

[Brief description of the drawings]

FIGS. 1A and 1B are assembly views of the exhaust converter of the present invention.

FIG. 2 is an assembly configuration diagram of a conventional exhaust converter.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Catalyst support, 1a ... Side surface, 1b ... Front end surface, 1c ... Rear end surface, 2 ... Support ring, 3 ... Seal mat, 4 ... Corrugated mesh, 5 ... Spacer ring, 5a ... Collar part, 6, 7 ... Case, 6a, 7a: central storage part, 6b,
7b: front end of storage, 6c, 7c: rear end of storage, 6d, 7
d, 6e, 7e ... connection end, 6f, 7f ... flange

Claims (1)

(57) [Scope of request for utility model registration] 1. An exhaust converter having a case for accommodating a catalyst carrier, comprising: a support member for holding one end of the catalyst carrier in an exhaust gas upstream direction and fixing the catalyst carrier to the case. The whole is between the outer peripheral surface of the catalyst carrier and the inner peripheral surface of the case,
In the case, a step portion is formed at a portion abutting on the support member, and the projecting portion of the step portion in the direction of the catalyst carrier is close to an end portion of the catalyst carrier from exhaust gas from upstream. An exhaust converter for protecting a support member.