JPH0629621U - Catalyst metal carrier - Google Patents

Abstract

(57) [Summary] [Purpose] The corrugated plate and the substrate are overlapped with each other to provide slits.
They can be easily manufactured by winding them in multiple layers, and even if they are thermally expanded by the heat of the exhaust gas, there is no damage such as peeling of the joint between the substrate and the corrugated plate, and it is an effective exhaust gas harmful substance. To be able to purify. [Structure] An exhaust gas inlet 4 is provided at one end in the longitudinal direction,
A catalyst metal carrier 1 having an exhaust gas outlet 5 at the other end and having a structure in which a substrate 7 and a corrugated plate 6 overlapping this are multiply wound.
Further, in the metal catalytic converter 2 including the container 9 containing the same, the catalytic metal carrier 1 is provided with at least one slit 8 cut from one end in the winding direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a carrier of a metal catalytic converter for purifying engine exhaust gas.

[0002]

[Prior art]

 Conventionally, catalysts, which are one of the exhaust gas purification devices that remove harmful components of exhaust gas, purify the exhaust gas in the container that holds the carrier coated with the active component and discharge it to the atmosphere. There is. As the carrier, a carrier made of ceramics or, recently, a metal carrier using a thin plate having a metal thickness of about 50 micrometers is used.

The metal carrier is formed by arranging thin corrugated plate-like members on a base substrate and rolling the corrugated plate into a tubular shape so that the corrugated plate is rolled into a tubular shape. -It is formed by joining both by welding or the like. Then, the formed carrier is immersed in a solution in which a component having an active action is dissolved to form a catalyst.

[0004]

[Problems to be solved by the device]

 A feature of the metal carrier is that it has good heat conduction compared to a ceramic carrier and the catalyst itself easily warms up, so that it takes a short time from the engine start to the catalyst activation time.

However, since the heat conduction is good, there is a problem that the temperature difference between the outer peripheral portion and the inside of the carrier tends to be large, and there is a concern that the inside of the carrier will be damaged. In other words, heat dissipation is active on the outer periphery of the carrier, but there is no escape area for heat inside and there is little heat dissipation. For this reason, a difference in thermal expansion coefficient occurs between the outer peripheral portion and the inner portion of the carrier, resulting in peeling of the bonded portion and damage to the carrier. It is also conceivable to arrange a plurality of carriers in series and form a space between the carriers, but with such a structure, the thermal conductivity of the carriers is not good and the number of manufacturing processes increases. There is.

Therefore, an object of the present invention is to provide a catalyst metal carrier which is free from damage due to thermal expansion in order to solve such problems.

[0007]

[Means for Solving the Problems]

 The present invention has been made in order to achieve the above-mentioned object, and has an exhaust gas inlet at one end in the longitudinal direction and an exhaust gas outlet at the other end, and a corrugated plate and a substrate overlapping this. In a metal catalytic converter having a container containing a catalytic metal carrier having multiple windings of and, the carrier is provided with at least one slit cut from the end in the winding direction.

[0008]

[Action]

 A slit is provided in the substrate and the corrugated plate that overlaps with the substrate by cutting the slit from the winding side, and by multiplying the slit, a cavity is formed inside the slit. Exhaust gas passes through a thin tube formed by a corrugated plate in the catalyst metal carrier and is purified by the catalyst, and the part expanded by the heat of the exhaust gas inside the carrier is escaped to the cavity.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the metal catalyst converter 2 is provided in the exhaust gas flow path of the engine. The container 9 is made of stainless steel, and the catalyst metal carrier 1 having the cavity 3 formed therein is supported by the bulging portion 10 at the center thereof. Before and after the bulging portion 10, a cone portion 11 and an exhaust gas inlet 4 and an exhaust gas outlet 5 are integrally formed at the tip of the cone portion 11.

As shown in FIG. 2, the catalyst metal carrier 1 is formed by stacking a corrugated plate 6 made of an alloy containing ferrite and aluminum on a substrate 7 made of metal so that It has slits 8 cut from the ends, and as shown in FIG. 4, these substrates and corrugated plates are rolled from the slit side with the corrugated plates inside and are formed into a cylindrical shape as shown in FIG. The length L from the rear end of the slit 8 to the end of the corrugated plate is set to be substantially equal to the outer circumference of the formed cylindrical catalyst metal carrier. Then, the corrugated plate and the substrate are joined by brazing the joints, and then they are dipped in a catalyst solution to coat the surface. Since the corrugated sheet is made of an alloy containing aluminum, the surface of the corrugated sheet has irregularities and a large surface area, so that a larger amount of catalyst can be attached and a wider area of action than that without aluminum. be able to. As shown in FIG. 5, the catalyst metal carrier has a semicylindrical thin tube 12 and a cavity 3 formed therein in the longitudinal direction. Exhaust gas flows through an exhaust gas pipe (not shown) from the inflow port 4 of the metal catalytic converter 2 and flows through the narrow tube 12 of the catalytic metal carrier 1. At this time, the heat of the exhaust gas is transferred to the catalyst metal carrier 1 and thermally expanded, but the cavity 3 provided therein allows the expanded portion to escape. Therefore, the exhaust gas is purified of harmful components by the function of the catalyst on the surface of the thin tube 12 without damaging the catalyst metal carrier 1, passes through the exhaust gas outlet 5, and is discharged to the atmosphere toward the muffler (not shown). Further, the number and size of the slits, that is, the size and number of the cavities 3 inside the catalyst metal are regulated by the engine displacement, the exhaust gas temperature, and the like.

[0011]

[Effect of device]

 As described above, according to the present invention, the substrate and the corrugated plate are overlapped with each other, and the slit cut from the end in the winding direction is provided, and the substrate and the corrugated plate are rolled from the slit side to form a cylindrical shape. As a result, a cavity is provided inside the catalytic metal carrier, which significantly reduces man-hours and prevents damage such as peeling of the joint between the substrate and the corrugated plate due to thermal expansion of the exhaust gas, effectively eliminating harmful substances in the exhaust gas. Can be purified.

[Brief description of drawings]

FIG. 1 is a sectional view of a metal catalytic converter according to an embodiment of the present invention.

FIG. 2 is a perspective view of an essential part of the catalyst metal of the present invention.

3 is a cross-sectional view of the main parts of FIG.

FIG. 4 is a perspective view showing a rolled state of the catalyst metal carrier of the present invention.

FIG. 5 is a perspective view of a catalyst metal carrier of the present invention.

[Explanation of symbols]

 1 Catalytic Metal Carrier 2 Metal Catalytic Converter 3 Cavity 4 Exhaust Gas Inlet 5 Exhaust Gas Outlet 6 Corrugated Plate 7 Substrate 8 Slit 9 Container 10 Bulging Part 11 Cone Part 12 Thin Tube

Claims (1)

[Scope of utility model registration request] 1. An exhaust gas inlet is provided at one longitudinal end thereof.
In a metal catalytic converter having an exhaust gas outlet at the other end, a substrate and a corrugated plate that overlaps with this substrate, and a metal catalyst converter having a container containing this, the catalyst metal carrier is wound. A catalyst metal carrier having at least one slit cut from one end in the direction.