JPS5919782Y2 - Exhaust gas sealing device in exhaust gas purification device using cylindrical catalyst body - Google Patents

Description

[Detailed description of the invention] The present invention relates to an exhaust gas sealing device for sealing raw exhaust gas passing between the cylindrical catalyst and the casing in an exhaust gas purification device using a cylindrical catalyst. The purpose of this invention is to prevent the annular seal plate from being deformed by the vibrations and heat of the vehicle body and entering the gap, thereby deteriorating the sealing performance.

A conventional exhaust gas purification device using a cylindrical catalyst body, as shown in FIG. The annular passage 3 is interposed to elastically support the radial direction of the cylindrical catalyst body 1.
Annular seal plates 5 are provided on both sides and on the outer periphery of both sides of the cylindrical catalyst body 1.
A ring-shaped metal cushion body 6 made of a heat-resistant fine metal wire complex compressed to a predetermined density is brought into contact with the outer side of the cushion body 6, and the outer side of the cushion body 6 is pressed with a cross-section type annular glue retainer 7 to form the annular shape. The seal plate 5 is connected to the metal cushion body 6 and the cylindrical catalyst body 1.
The outer flange 7a of the retainer was welded and fixed to the inner surface of the casing 2, and the lower part of the metal cushion body 6 was supported by the inner flange 7b, so it was sealed by the force of exhaust gas and vehicle vibration. As the plate 5 gradually moves in the radial direction or toward the center of the annular passage 3 and cannot completely seal the annular passage 3, a portion of the exhaust gas flows into the annular passage 3 from the metal cushion body 6 on the inlet side, and then flows toward the annular passage 3 at the outlet. side metal cushion body 6
This has the disadvantage that it is directly discharged to the outside.

For this reason, it was considered to re-spot weld the metal cushion body and the seal plate with ceramic or the like, but this was not reliable and durable due to the high temperature of the exhaust gas, and bonding with wire, nails, etc. was also considered. This had the disadvantage of poor workability and cushioning properties.

In the present invention, an annular projection is provided on the inner surface of the casing, and the outer periphery of the seal plate is locked with the annular projection, thereby eliminating the drawbacks of the conventional method.

FIG. 2 shows an embodiment of the present invention, in which protrusions 8 are provided protrudingly on the inner surface of the casing 2 corresponding to both end surfaces of the cylindrical catalyst body 1, and a metal cushion body 6 is provided on the outer periphery of the inner surface of the annular seal plate 5. It is press-locked to the projection 8.

According to the present invention, a cylindrical catalyst body inserted into a casing is elastically supported in the radial direction by interposing a corrugated net made of thin heat-resistant metal wires in the annular path on the outer peripheral surface of the cylindrical catalyst body and the inner peripheral surface of the casing. In an exhaust gas purification device using a catalyst body, protrusions are provided on the inner surface of the casing corresponding to both end surfaces of the cylindrical catalyst body, an annular seal plate is brought into contact with the protrusions and both sides of the cylindrical catalyst body, and a seal plate is further provided. Since the annular metal cushion body is fixed in contact with the outer surface, even if the force of exhaust gas or vibration of the vehicle acts on the seal member, the outer periphery of the seal member is pressed and locked by the protrusion, so it will not shift in the radial direction. It has a sufficient sealing effect without being deformed or entering the casing inner surface gap.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of a conventional exhaust gas purification device, and FIG. 2 is a front sectional view of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Cylindrical catalyst body, 2... Casing, 3... Annular path, 5... Seal plate, 6
・・・・・・Metal cushion body.

Claims (1)

[Scope of utility model registration request] Exhaust gas purification using a cylindrical catalyst body inserted into a casing, with a corrugated net made of thin heat-resistant metal wire interposed between the outer peripheral surface of the casing and an annular path on the inner peripheral surface of the casing to provide elastic support in the radial direction. In the device, protrusions are provided on the inner surface of the casing corresponding to both end surfaces of the cylindrical catalyst body, an annular seal plate is brought into contact with the protrusions and both sides of the cylindrical catalyst body, and an annular seal plate is provided on the outer surface of the seal plate. Exhaust gas seal device with metal cushion body fixed in contact.