JPH01280614A - Holding device for catalyser - Google Patents

Abstract

PURPOSE:To prevent deterioration of activity of a catalytic body at the time of manufacture or assembly by welding a supporting member to a carrier and fixedly securing the supporting member to a catalytic case, in a catalyser case holding the catalytic body in which a catalyser is carried on the carrier. CONSTITUTION:A catalytic device 26 provided on the way of an exhaust pipe of an internal combustion engine is constructed so that a combined member with a flat plate and a corrugated plate made from heat resistance steel or the like is wound in spiral so as to build a carrier 34, a catalytic body 28 is built by carrying a catalytic metal in this carrier, and the catalytic body 28 is received in a catalytic case 30. In this case, a supporting member 32 is fitted on the nearly center position M in the lengthwise direction of the catalytic body 28. This supporting member 32 is made of a metallic ring consisting of inner and outer circle parts 32a, 32b and connecting members 32c-1, 32c-2 connecting them. The supporting member 32 is positioned on the opposed end parts of a first and a second case 30-1, 30-2 of the catalytic case 30, and connected in one body with welding part 40 at its outer circle part 32b of the supporting member 32. Thus fitting of the catalytic body 28 can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a catalyst holding device, and more particularly to a catalyst holding device that holds a catalyst body used in an internal combustion engine.

[Conventional technology]

In an internal combustion engine, a catalyst device is provided in the middle of an exhaust pipe in order to convert harmful exhaust gas from the internal combustion engine into harmless exhaust gas under predetermined gas composition and temperature conditions by the action of a catalyst substance. This catalyst device generally consists of a catalyst body configured by supporting a catalyst that reacts with exhaust gas on a carrier, a catalyst case that holds the catalyst body, and a support member provided between the catalyst case and the catalyst body. .

As shown in FIG. 9, the catalyst holding device that holds the catalyst body includes a first connecting end 24-1a of the first exhaust pipe 24-1 and a second connecting end 24- of the second exhaust pipe 24-2. 2a is expanded to form a housing portion 72 for the catalyst body 28, and this housing portion 72
accommodates the catalyst body 28 encapsulated in an outer cylinder 74 which is a supporting member, and connects the end 74a of the outer cylinder 74 and the first connecting end 24-1a.
and the other end 74 of the outer cylinder 74.
There is one in which the terminal b and the second connecting end 24-2a are connected by welding.

Further, a catalyst holding device for holding a catalyst body is disclosed in, for example, Japanese Utility Model Publication No. 57-47374. In the method described in this publication, the catalyst body is firmly held by integrating the catalyst body with a metal cylinder that encloses the catalyst body.

[Problem that the invention attempts to solve]

However, in the conventional catalyst holding snow mounting shown in FIG. 9, after the outer cylinder is wrapped around the entire outer surface of the catalyst body formed by supporting the catalyst on a carrier, a first exhaust pipe and a second exhaust pipe are installed at both ends of the outer cylinder. When welding the exhaust pipe, a heat affected zone E is generated due to the heat of welding, and a part of the catalyst becomes high temperature due to this heat affected zone E, reducing the purification function. This has the disadvantage that the connection work becomes troublesome.

In addition, the method described in the above-mentioned publication involves forming bends in the metal cylinder and fixing the catalyst body and the metal cylinder by MIG welding, which complicates the manufacturing process and makes the manufacturing work troublesome. There was an inconvenience.

[Purpose of the invention]

Therefore, the purpose of this invention is to eliminate the above-mentioned disadvantages.
The catalyst body is constructed by supporting the catalyst on a carrier to which the supporting member is welded, and by fixing the supporting member and the catalyst case, the catalyst body can be manufactured without deteriorating its functionality, and the catalyst body can be easily exposed to outside air. The object of the present invention is to realize a catalyst holding device that avoids contact between the catalysts and the catalyst, improves heat retention, improves the start-up of the purification reaction, and facilitates manufacturing work.

[Means for solving problems]

In order to achieve this object, the present invention provides a catalyst holding device that holds a catalyst body configured by supporting a catalyst on a carrier in a catalyst case, in which a supporting member is welded to the carrier; A catalyst is supported on the carrier, and the supporting member is fixed to the catalyst case.

[Effect]

According to the structure of this invention, when configuring the catalyst device,
First, a support member is welded to a carrier, a catalyst is supported on the carrier to which the support member is welded to form a catalyst body, then the support member is fixed to a catalyst case, and the catalyst case is connected to an exhaust pipe. .

Thereby, the catalyst body is not affected by heat during manufacture, and the purification performance of the catalyst body can be ensured well.

〔Example〕

Embodiments of the present invention will be described in detail and specifically below based on the drawings.

1 to 6 show embodiments of this invention. In the figure, 2 is an internal combustion engine, 4 is an air cleaner, 6 is a carburetor, 8 is an intake manifold, 10 is an intake passage, 12 is an exhaust manifold, and 14 is an exhaust passage. The intake passage 10
communicates with the intake port 16 of the internal combustion engine 2. This intake bow 1-16 communicates with a combustion chamber 20 via an intake valve 18, and this combustion chamber 20 communicates with an exhaust passage 14 via an exhaust valve 22.

A catalyst device 26 is provided in the middle of the exhaust pipe 24 connected to the exhaust passage 14 to purify the exhaust gas. This catalyst device 26 is interposed between a first exhaust pipe 24-1 on the upstream side and a second exhaust pipe 24-2 on the downstream side.

The catalyst device 26 includes a catalyst body 28 and a catalyst case 30.
and a support member 32 that supports the catalyst body 28.

The catalyst body 28 is constructed by supporting a catalyst metal (not shown) on a carrier 34 formed by combining a flat plate and a corrugated plate made of heat-resistant steel and spirally wound.

The catalyst case 30 has a first connection end 3O-1a on the upstream side connected to the first exhaust pipe 24-1, and a downstream side connected to the second exhaust pipe 24-2. Second
It consists of a second case 30-2 having a connecting end 3O-2a, and is formed by expanding the housing section 36 for the catalyst body 28.

As shown in FIG. 3, the support member 32 has a hollow portion 38, an inner circumferential portion 32a, an outer circumferential portion 32b, and an inner circumferential portion 32a.
and a first and second connecting portion 32cm that connects the outer peripheral portion 32b.
It is formed of a metal ring made of 1.32C-2, and is fitted with its center located at approximately the center portion M in the longitudinal direction X of the catalyst body 28.

Further, the downstream first connection end 3 of the first case 30-1
The support member 32 fitted to the catalyst body 28 is positioned at the welding part 40 between O-1b and the upstream second connection end 3O-2b of the second case 30-2, and the outer peripheral part of this support member 32 is 32b are integrally connected at a welding portion 40.

Further, the support member 32 is welded to the carrier 34 at the welded portion 40 by a welding means such as brazing or welding before the metal catalyst is supported.

Next, the operation of this embodiment will be explained.

When configuring the catalyst device 26, first, the carrier 34 is formed, and then the support member 32 is attached to the substantially central portion M of the outer surface of the carrier 34.
The inner peripheral part 32a of the carrier 34 is fitted, and then the outer peripheral part 32a of the carrier 34 is fitted.
b and the inner peripheral portion 32a of the support member 32 are welded together at the welding portion 42 (see FIG. 4).

Then, a metal catalyst is supported on the carrier 34 fitted with the support member 32, thereby forming the catalyst body 28 (see FIG. 5).

Next, the first case 30-1 and the second case 30-2 are
(see FIG. 6) to cover the catalyst body 28 from both ends (see FIG. 6), and the downstream first connection end 3O-1b of the first case 30-1 and the upstream connection end 3O-1b of the second case 30-2. 2 connection end 3O-2b is located approximately at the center of the outer peripheral portion 32b of the support member 32 (see FIG. 2).

Next, the first downstream connection end 3O-1b, the second upstream connection end 3O-2b, and the outer peripheral part 32b of the support member 32 are simultaneously welded and integrated at the welding part 40.

As a result, before supporting the metal catalyst on the carrier 34, that is, before forming the catalyst body 28, the supporting member 32 and the carrier 3
4, it is possible to prevent the purification performance of the metal catalyst from deteriorating due to the heat of the welding means such as brazing or welding.

Further, since the supporting member 32 and the catalyst case 3o are connected by the negative welding part 40, the work is simple, and since the welding part 40 is connected to the outer peripheral part 32b separated from the catalyst body 28, the welding It is possible to prevent the heat caused by the heat from having an adverse effect on the catalyst body 28 as much as possible.

Further, since the catalyst body 28 and the catalyst case 30 are separated from each other, and the support member 32 has a hollow portion 38, heat retention is good, and the purification reaction of the metal catalyst starts up quickly. Performance can be improved.

It should be noted that the present invention is not limited to the above-described embodiments, and of course can be modified in various ways.

For example, as shown in FIG. 7, the support member 52 has a hunt-shaped cross section and includes first and second inner peripheral parts 52a-1 and 52a-2 welded to the outer peripheral surface of the carrier 34 of the catalyst body 28, and a first inner peripheral part 52a-1, 52a-2. An outer circumferential portion 52b fixed to the downstream first connecting end 3O-1b of the case 30-1 and the upstream second connecting end 3O-2b of the second case 30-2; Inner peripheral part 52a-
1, 52a-2 and the outer peripheral portion 52b.
It is also possible to configure the connecting portion with a length of 52 cm and a length of 1.52 cm.

In addition, as shown in FIG. 8, the support member 62 is attached to the inner peripheral part 62a of the catalyst body 28 which is welded to the outer peripheral surface of the carrier 34, and to the downstream first connection end 3O-1b of the first case 30-1. The first outer peripheral part 62b-1 is fixed and the second outer peripheral part 62 is fixed to the upstream second connection end 3O-2b of the second case 30-2.
b-2, these inner peripheral parts 62a, and the first and second outer peripheral parts 62
The first and second connecting portions 62 that connect b-1 and 62b-2.
It is also possible to configure it by cm1.62cm2.

〔Effect of the invention〕

As is clear from the above detailed description, according to the present invention,
By constructing a catalyst body by supporting a catalyst on a carrier to which a support member is welded, and by fixing the support member to a catalyst case, it is possible to prevent the performance of the catalyst body from deteriorating during manufacturing and assembly. Since the catalyst body does not come into contact with the outside air, it has good heat retention, improves the start-up of the purification reaction, and improves purification performance.

Further, according to the configuration of the present invention, manufacturing and assembly are simple and inexpensive.

[Brief explanation of the drawing]

1 to 6 show examples of the present invention, FIG. 1 is a schematic diagram of an internal combustion engine equipped with a catalyst device and an intake/exhaust system, FIG. 2 is a sectional view of the catalyst device, and FIG. 3 is a support member. A sectional view, FIG. 4 is a perspective view of a support member fitted onto a carrier, and FIG. 5 is a perspective view of a metal catalyst supported on a carrier fitted with a support member.
FIG. 6 is a perspective view when fitting the catalyst case to the catalyst body. FIG. 7.8 is a sectional view showing another shape of the support member according to the present invention. FIG. 9 is a sectional view of a conventional catalyst device. In the figure, 2 is an internal combustion engine, 8 is an intake manifold, and 12 is an internal combustion engine.
is an exhaust manifold, 24 is an exhaust pipe, 26 is a catalyst device, 2
8 is a catalyst body, 30 is a catalyst case, 32 is a support member, 3
4 is a carrier, 36 is a housing part, 40 is a welding part, and 42 is a welding part.

Claims (1)

[Claims] 1. In a catalyst holding device that holds a catalyst body configured by supporting a catalyst on a carrier in a catalyst case, a supporting member is welded to the carrier, a catalyst is supported on the carrier to which the supporting member is welded, and the A catalyst holding device characterized in that a support member is fixed to the catalyst case.