JP2802550B2 - Exhaust gas purification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalytic converter used, for example, for purifying exhaust gas of an automobile, and more particularly to an exhaust gas for preventing airtightness and interference between a carrier for supporting a catalyst and a container for accommodating the same. The present invention relates to a gas purification device.

[0002]

2. Description of the Related Art FIG. 7 shows a known monolithic catalytic converter provided at an intermediate portion of an exhaust pipe between an engine and a muffler, and exhaust pipes (1a) and (1b) are connected before and after. In a container (2) made of stainless steel or the like, a substantially cylindrical carrier (3) having a large number of lattice-like (honeycomb-like) passages in the direction in which exhaust gas flows, or a sheet metal is formed into a corrugated shape. A cylindrical metal carrier (not shown) is accommodated. When the exhaust gas passes through the carrier (3), each passage
The catalytic substances (exhaust gas purifying means) such as platinum (Pt) and palladium (pd) supported on the surface layer of the (cell) (not shown) make CO and HC in the exhaust gas harmless CO ₂ and H ₂ O. And so on.

In such a monolithic catalytic converter, a seal member (4) for preventing the exhaust gas from flowing downstream while maintaining the airtightness between the carrier (3) and the container (2). ) Or glass wool or wire net (5) to prevent the carrier (3) from interfering with the container (2) due to vibration, etc.
A retainer (6) for preventing the carrier (3) from moving in the container (2) in the front-rear direction (left-right direction in FIG. 7) of the vehicle body is indispensable.

[0004]

The conventional catalytic converter described above has a large number of parts for stably and airtightly storing the carrier (3) in the container (2), and Since a complicated process such as filling glass wool or wire net (5) is required, much time is required for manufacturing and assembling.
This results in higher production costs.

In particular, the sealing member (4) is easily affected by high-temperature exhaust gas and harmful components contained in the exhaust gas. In addition, it is necessary to use an expensive material having excellent corrosion resistance and the like, which increases the cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and stably supports a carrier (cylindrical body) housed in a container by a minimum member having a holding function and a sealing property. Accordingly, an object of the present invention is to provide a low-cost catalytic converter by reducing man-hours during manufacturing and assembly.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide an exhaust gas purifying apparatus comprising a cylindrical container through which exhaust gas flows, and a gas-permeable column having exhaust gas purifying means housed therein. An annular groove is formed in at least one of the opposing surfaces of the inner peripheral surface and the outer peripheral surface of the columnar body, and a plurality of band plates made of an elastic material are spirally wound around the annular groove in a ring shape. At the same time, by fitting a multiple winding ring in which the inner and outer diameters are alternately changed in two stages, large and small, with a required period of 360 ° or more in the second and subsequent rounds, while elastically deforming in the diameter reducing or expanding direction Can be achieved.

[0008]

The carrier (cylinder) is stably held in the container by the elastic action of the multiple winding ring in the radial direction. In addition, at the time of storage, the inner and outer peripheral ends of the multiple winding ring press the container and the carrier in a relative direction and press them against each other while maintaining a substantially circular state, so that the exhaust gas passes through the gap between the container and the carrier. It does not flow downstream.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a catalytic converter will be described below. The same members as those in the above-described conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted. In FIG. 1, it was housed in a container (2),
The downstream end of the carrier (cylindrical body) (3) containing a catalytic substance (not shown) as an exhaust gas purifying means is supported by a buffering material (5) such as glass wool or a wire net, and The end on the exhaust upstream side is a multiple winding ring (7) described in detail below.
Is externally fitted into an annular groove (8) formed on the outer peripheral end of the carrier (3), and the outer peripheral end thereof is elastically fitted into a relatively shallow annular groove (9) formed on the inner peripheral surface of the container (2). By being fitted into each other, the container (2) and the carrier (3) are supported such that the airtightness is maintained.

[0010] The multi-turn ring (7) is, for example, a piano wire.
After forming an elastic metal material such as (hard steel wire), oil-tempered wire, stainless steel wire, nickel-base heat-resistant alloy wire into a strip having a predetermined width and thickness, a ring-shaped spiral is formed. It is wound in close contact with the shape.

That is, as shown in FIGS. 2 to 5, the first weight (10) is overlapped with its starting end (10a).
After winding to a little over 60 °,
The inner and outer diameters of (1) are increased by approximately 1/2 of the plate width of the first weight (10) by gradually changing the starting end (starting of winding) (11a) gradually into an arc shape in the expanding direction. While displacing in the radial direction, the end portion (end of winding) (11b) is, as shown in FIG. 5, a place where the inner and outer diameters become constant beyond the starting end (11a) of the second double stitch (11). It is wound up to the point where the triple winding is slightly overlapped.

When wound in this manner, the inner and outer diameters of the ring (7) are inevitably rounded, and one of the rings of the first weight (10) and the second weight (11) Even when a load is applied in the diameter increasing or reducing direction indicated by the arrow in FIG. 4, both rings are relatively elastically deformed in the radial direction while maintaining a perfect circular state.

When accommodating the carrier (3) at a predetermined position in the container (2), first, before connecting the exhaust pipe (1a) on the upstream side to the container (2), the first heavy (10) A multiple winding ring (7) formed so that the inner diameter of the ring is substantially equal to the outer diameter of the groove bottom of the annular groove (8) in the carrier (3) is tightly fitted in the annular groove (8) in advance.

Then, with the multiple winding ring (7) slightly reduced in diameter, the carrier (3) is connected to the cushioning material (5) at the end opposite to the side where the ring (7) is fitted. When it is inserted into the container (2) until it comes into contact with the annular groove (9) formed on the inner peripheral surface of the container (2) and the outer peripheral end of the ring (7) resiliently fits into the container (2), as shown in FIG. As shown in (2), the carrier (3) is stably supported at an appropriate distance from the inner peripheral surface.

In this housed state, the multiple winding ring (7)
Acts as a retainer, which prevents the carrier (3) from moving in the axial direction, and the elastic action of the ring (7) in the radially expanding direction causes the inner peripheral end of the first weight (10) to move toward the carrier. (3) The bottom of the annular groove (8) on the side and the outer peripheral end of the second double stitch (11)
(2) The container is in close contact with the groove bottom of the annular groove (9) on the side.
Since it has a function as a sealing member for maintaining airtightness between (2) and the carrier (3), the exhaust gas is supplied to the container (2).
It does not flow downstream through the gap between the carrier and the carrier (3).

In addition, even if the container (2) vibrates up and down during running of the vehicle, the vibration is transmitted directly to the carrier (3) because it is absorbed by the spring action of the ring (7). There is no.

FIG. 6 shows a multiple winding ring (12) wound in quadruple winding such that the inner and outer diameters alternately change in two stages, large and small, according to the same winding procedure as the multiple winding ring (7). Carrier (3)
This is an example in which the annular grooves (8) and (9) of the container and the container (2) are fitted. With such a quadruple winding, each annular groove (8)
(9) The contact area increases, and the sealing property is improved.

The present invention is not limited to the above embodiments, but can take various forms. For example, multi-turn rings
(7) may be externally fitted to the outer peripheral surface of the other end (downstream side) of the carrier (3), and the carrier (3) may be supported by a pair of front and rear multiple winding rings (7). .

In this case, one of the annular grooves (9) on the container (2) side can be omitted. In the embodiment, the multiple winding ring (7) is fitted on the carrier (3) side, but the annular groove (9) of the container (2) may be formed slightly deeper and fitted inside.

The inner and outer peripheral surfaces of the rings 7 and 12 may be subjected to chrome plating or the like having wear resistance. Multiple winding ring
(7) The number of turns in (12) is not limited to the above embodiment. Although not shown, the present invention can also be applied to a particulate trap for removing carbon particles (soot) contained in exhaust gas of a diesel engine, in addition to the catalytic converter. In this case, instead of the carrier (3), a cylindrical body having a built-in porous filter (ceramics, etc.)
(2) housed in the above, multiple winding ring similar to the above (7) (12)
May be fitted between the cylindrical body and the container.

[0021]

According to the present invention, the movement of the carrier is prevented and the airtightness is maintained with a simple structure in which only the multiple winding ring is fitted between the container and the carrier (cylindrical body). Therefore, the number of parts is reduced as compared with the related art, and the operation can be performed at low cost. Further, since the multi-turn ring absorbs vibration, there is no possibility that large vibration is transmitted to the carrier.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a main part of an embodiment in which the present invention is applied to a catalytic converter.

FIG. 2 is a front view of a multiple winding ring.

FIG. 3 is a right side view of the same.

FIG. 4 is a longitudinal sectional side view taken along line AA in FIG. 2;

FIG. 5 is an enlarged cross-sectional plan view along the line BB in FIG. 2;

FIG. 6 is an enlarged vertical sectional front view of a main part showing a usage example of another embodiment of the multiple winding ring.

FIG. 7 is a vertical sectional front view of a conventional catalytic converter.

[Explanation of symbols]

(1a) (1b) Exhaust pipe (2) Container (3) Carrier (cylindrical body) (5) Buffer material (7) Multi-turn ring (8) (9) Annular groove (10) First heavy weight (10a) Start end Part (11) Second doublet (11a) Start end (11b) End (12) Multi-turn ring

Claims (1)

(57) [Claims] 1. An exhaust gas purifying apparatus comprising a cylindrical container through which exhaust gas flows, and a gas permeable column having exhaust gas purifying means housed therein, wherein an inner peripheral surface of the container and an outer periphery of the column are provided. An annular groove is formed in at least one of the surfaces facing each other with the surface, and a plurality of strips made of an elastic material are spirally wound in a ring shape in the annular groove, and the second and subsequent double stitches are formed. An exhaust gas purifying apparatus characterized in that a multiple winding ring in which the inner and outer diameters are alternately changed in two stages of large and small in a required cycle of 360 ° or more is fitted in a state of being elastically deformed in the direction of diameter reduction or diameter expansion.