JPS635768Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention comprises an integrated catalyst with a circular outer circumferential surface and a cushion attached to the end of the catalyst, and the inner hole of the cushion is made non-circular to increase the range of elastic deformation of the catalyst. This invention relates to a catalyst unit that prevents the catalyst unit from falling off and from being damaged due to falling off.

BACKGROUND ART In recent years, monolithic catalysts using ceramic carriers, so-called honeycomb monolith catalysts, have been widely used as catalysts for exhaust gas purification and heat storage catalysts for preventing afterburn. However, such integrated catalysts have particularly poor impact resistance, so
For installation, it is necessary to use a cushion. On the other hand, for example, a catalyst used as a heat storage part in the exhaust port of the engine or in the exhaust manifold near the exhaust port in order to prevent afterburn by burning and oxidizing gas at a low temperature has an outer diameter of about 40 mm. , and the thickness is also approx.
Although they are relatively small at around 10 mm, the fit tolerance of catalysts and cushions, especially cushions, cannot be made small due to manufacturing reasons.
Therefore, when a circular catalyst is protected using a circular cushion, the fit may be loose within the tolerance range, and the catalyst may fall off and crack when the catalyst and cushion are attached. Note that when the standard size of the cushion is set to a small value, the tightening margin becomes too large and it becomes impossible to insert the cushion.
Using different types leads to an increase in cost.

The present invention aims to provide a catalyst unit that can solve these problems, and one embodiment thereof will be described below with reference to the drawings.

1 to 2 and FIGS. 5a and 5b show an embodiment in which the catalyst unit 1 of the present invention is employed as a heat storage part for preventing afterburn, and shows an integrated catalyst 2 and a cushion 3 used as the heat storage part. and. The integrated catalyst 2 has a disk shape in which a catalyst portion is supported on a monolithic carrier having a circular outer peripheral surface 4 and square through holes arranged in parallel, and a cushion 3.
has an annular portion 6 and an inner flange 7 protruding inward from one end thereof, an inner hole 9 into which the end of the integrated catalyst 2 is inserted, and a through hole 10 in the inner flange 7. It is formed into an L-shaped cross section with a stepped part a, and is produced by, for example, knitting heat-resistant thin wires such as stainless steel, then rolling them up and compression-molding them using a mold. Ru. Further, in this embodiment, the cushion 3 is formed into a substantially square shape including the inner hole 9 by smoothly connecting four equal and relatively large circular arc portions 11 with small circular arc portions 12. It is formed into a non-circular shape. Note that the inner circumference length of the inner hole 9 is the same as the circumference length when the cushion 3 is formed in a circular shape, and therefore the minimum diameter length D ₁ is the minimum allowable length of the catalyst 2 even at the lower tolerance limit. It can be set smaller than the dimensions. Note that a recess 13 is provided at the corner of the ring portion 6 and the inner flange portion 7 to ensure contact between the integrated catalyst 2 and the inner flange portion 7.

However, the catalyst unit 1 of the present invention is inserted into the inner hole 9 by hand until both ends of the integrated catalyst 2 come into contact with the stepped part a of the inner flange part 7 of the cushion 3. As shown in FIG. 5a, use the guide 14 and the press jig 15 to insert one side of the cushion 3 into the tip hole of the exhaust manifold 16 so that it protrudes, and insert the exhaust manifold 16 into the protruding part of the cushion 3 or the exhaust manifold 16. It is attached to the circumferential surface of the exhaust port section 19 of the engine 17 via a gasket by applying narrow pressure so that it is flush with the end surface. At this time, the inner hole 9 of the ring portion 6 of the cushion 3 is formed into a non-circular shape, and therefore the cushion 3 is elastically deformed from the minimum diameter length D ₁ until it is deformed into a circular shape by the insertion of the integrated catalyst 2. Therefore, the range in which the cushion 3 can be elastically deformed can be increased compared to the case where the cushion 3 is produced in a circular shape, and the interference between the cushion 3 and the catalyst 2 can be increased. By increasing the pressure, the catalyst 2 is prevented from falling off during installation work. Note that, after the cushion 3 is deformed into a perfect circle, it has the same amount of expansion as a cushion that has been previously formed into a circular shape, and firmly clamps the catalyst 2 therein.

FIG. 3 shows another example of a cushion 3 formed into an oval shape by having relatively large circular arc portions 11 placed opposite each other and smoothly connecting the upper and lower portions of the circular arc portions 11 with small diameter circular arc portions 12, and FIG. are three arc parts 11...
Another example of the cushion 3 is shown in which the cushion 3 is formed into a substantially triangular shape by connecting the sections with a straight line portion 12a.

As described above, the catalyst unit 1 of the present invention includes an integrated catalyst with a circular outer circumferential surface and a cushion that can be fitted into the end of the integrated catalyst and has a ring portion with a non-circular inner hole. The amount of elastic deformation increases, and as a result, the catalyst can be inserted while being reliably pressed and clamped, which prevents the integrated catalyst from falling off during installation, prevents cracks, etc., and improves work efficiency during installation. sell.

It should be noted that the production cost of the cushion does not increase much compared to conventional circular bodies, and on the contrary, the amount of elastic deformation is large and the dimensional tolerance of the manufacturing process can be increased, thereby making it possible to reduce the cost. The catalyst unit of the present invention can be suitably used in relatively small catalyst locations such as a heat storage section for afterburn prevention, and can also be employed as a catalyst unit using a large integrated catalyst for so-called exhaust gas purification. Note that by providing a protrusion in the inner hole or by using an ellipse, the inner hole can be formed into a non-circular shape, and when a protrusion is provided on the outer periphery of the ring part, the attachment to the exhaust manifold or catalyst container can be made strong and reliable. .

[Brief explanation of the drawing]

Figure 1a is a plan view illustrating a catalyst used in an embodiment of the present invention, Figure 1b is a front view thereof, and Figure 2a is a
is a plan view illustrating a cushion used in one embodiment of the present invention, FIG. 2b is a sectional view thereof, FIGS. 3 to 4 are plan views illustrating other cushions, and FIGS. FIG. 3 is a cross-sectional view illustrating the method. 2... catalyst, 3... cushion, 6... ring part,
7... Inner flange, 9... Inner hole.

Claims (1)

[Scope of utility model registration request] A heat-resistant cushion comprising an integrated catalyst with a circular outer circumferential surface, and an inner flange portion that abuts the end surface of the catalyst at one end of an annular portion into which the end portion of the catalyst can be pressed and inserted, and the inner hole is non-circular. equipped catalyst unit.