JP6862135B2 - Catalytic metal carrier - Google Patents

Description

The present invention relates to catalytic metal carriers.

Conventionally, there are those described in Patent Documents 1 and 2 as catalytic metal carriers for purifying exhaust gas discharged from an internal combustion engine such as an automobile engine.

The catalyst metal carrier for an automobile engine described in Patent Document 1 is a cylindrical stainless steel metal foil (foil) in which a plurality of recesses are continuously formed in the circumferential direction on the inner peripheral surface of a stainless steel tubular case. It is constructed by rowing (thickness about 200 μm). As a result, a large number of small exhaust passages partitioned by the cylindrical metal leaf are partitioned inside the exhaust passage formed by the tubular case. Then, a catalyst is applied, baked and supported on the inner peripheral surface of the tubular case and the surface of the metal foil defining the small exhaust flow path.

In the catalyst metal carrier for an automobile engine described in Patent Document 2, a plurality of metal honeycomb bodies are separately arranged inside a stainless steel tubular case, and a tube shape body and / or a plate shape are formed between the metal honeycomb bodies. A body is arranged, and these metal honeycomb bodies, tube-shaped bodies and / or plate-shaped bodies are brazed to the inner peripheral surface of the tubular case. The metal honeycomb body is constructed by using flat foil and corrugated foil made of metal such as stainless steel. As a result, a large number of small exhaust passages composed of small holes of the metal honeycomb body are formed inside the exhaust passage formed by the tubular case, and the small exhaust passages are partitioned by the tube shape and / or the plate shape. To partition. Then, a catalyst is coated and supported on the inner peripheral surface of the tubular case, the inner surface of the small holes of the metal honeycomb body defining the small exhaust flow path, and the surface of the tube-shaped body and / or the plate-shaped body. Will be done.

Japanese Unexamined Patent Publication No. 2001-129407 Japanese Unexamined Patent Publication No. 2008-142682

The catalytic metal carrier described in Patent Document 1 has the following problems.
(1) A cylindrical metal foil is brazed to the inner peripheral surface of the tubular case.
When the exhaust gas temperature exceeds the melting point of the brazed material (for example, about 1050 ° C.) during high-load operation of the automobile engine, the brazed material melts and the cylindrical metal foil cannot be fixed to the tubular case.

In addition, when a large thermal stress is generated between the metal leaf distorted by the exhaust gas that has become hot due to the high load operation of the automobile engine and the tubular case under air cooling, or when the vibration of the automobile body and the engine becomes intense, these heats are generated. Stress and violent vibration destroy the metal leaf, making it impossible to fix the cylindrical metal leaf to the tubular case.

The catalytic metal carrier described in Patent Document 2 has the following problems.
(2) A metal honeycomb body, a tube shape body and / or a plate shape body is brazed to the inner peripheral surface of the tubular case.

When the exhaust gas temperature exceeds the melting point of the brazed material (for example, about 1050 ° C.) during high-load operation of an automobile engine, the brazed material melts and forms a metal honeycomb body, a tube-shaped body, and / or a plate-shaped body. It cannot be fixed to the shape case.

In addition, when a large thermal stress is generated between the metal honeycomb body distorted by the exhaust gas that has become hot due to the high load operation of the automobile engine and the tubular case under air cooling, or when the vibration of the automobile body and the engine becomes intense, these Thermal stress and violent vibration destroy the metal honeycomb body, making it impossible to fix the metal honeycomb body to the tubular case.

When the catalytic metal carrier described in Patent Documents 1 and 2 is used in a harsh driving environment of an automobile such as an automobile race competition, the exhaust gas temperature becomes high and the vibration of the vehicle body and the engine increases particularly severely. Therefore, the problems (1) and (2) described above become more prominent.

Even if the brazed portion used in the catalyst metal carrier described in Patent Documents 1 and 2 is simply replaced with a welded portion by spot welding or the like, high-temperature exhaust gas is emitted under the harsh driving environment of an automobile. It is not possible to avoid the destruction of the metal foil and the metal honeycomb body due to the thermal stress caused by the heat stress and the violent vibration of the vehicle body and the engine.

In particular, under harsh driving conditions such as automobile racing competitions, the unburned gas is the inner peripheral surface of the tubular case in the catalyst metal carrier, the cylindrical metal foil, or the metal honeycomb body, the tube shape body and / or the plate shape. It adheres to the body and causes afterfire, and the cylindrical metal foil or metal honeycomb body, the tube shape body and / or the plate shape body is exposed to higher temperature and higher pressure exhaust gas.

Then, in the catalyst metal carriers described in Patent Documents 1 and 2, when the cylindrical metal foil, the metal honeycomb body, the tube shape body and / or the plate shape body cannot be fixed to the tubular case, those cylindrical shapes are formed. Not only does the metal leaf, metal honeycomb, tube-shaped body and / or plate-shaped body fall off from the tubular case and lose purification performance, but it also scatters on the track and interferes with the safe running of the following vehicle. There is a risk that the race will be interrupted.

An object of the present invention is to provide a catalytic metal carrier capable of ensuring high durability in a harsh usage environment.

The invention according to claim 1 is a catalytic metal carrier in which metal fin forming bodies are arranged inside an exhaust passage formed by a tubular case, and the thickness of a large number of fin forming bodies is 0.8 to 3 mm. It has plate-shaped fins formed by supporting a catalyst on the surface, and each fin is provided with a bent portion for absorbing thermal strain in the middle portion in the plate longitudinal direction, and each fin is tubular in the plate longitudinal direction. It extends in the exhaust passage so as to intersect the inner peripheral surface of the case, and a large number of small exhaust passages are partitioned in the exhaust passage by adjacent fins, and the inside of the tubular case in each fin of the fin forming body. The end portion intersecting the peripheral surface is provided so as to engage with the detent portion provided on the inner peripheral surface of the tubular case so as to engage in the circumferential direction of the tubular case, and the fin forming body is formed. It consists of an integral body carved out so that a large number of plate-shaped fins are integrated, and the fin forming body is integrated with a large number of plate-shaped fins and connected to the tips of those fins. It has an outer ring portion that surrounds the fins, and the outer ring portion is provided so as to engage with a detent portion provided on the inner peripheral surface of the tubular case in the circumferential direction of the tubular case to prevent detent. A retaining member for preventing the fin forming body from falling off from the tubular case is not joined to the fins of the fin forming body, and the fin forming body is moved in the tubular axial direction of the tubular case. It is supported by the tubular case while being held in place.

(a) The ends of the plate-shaped fins of the fin forming body that intersect the inner peripheral surface of the tubular case are brazed to the inner peripheral surface of the tubular case and are not welded to the inner peripheral surface. It is provided so as to engage with the detent portion provided in the above in the circumferential direction of the tubular case to prevent detent. Further, a retaining member for preventing the fin forming body from falling off from the tubular case is supported by the tubular case and holds the fin forming body in the tubular axial direction of the tubular case. Therefore, the fin forming body is prevented from rotating inside the tubular case, is also held in the axial direction, is stably held by the tubular case, and is prevented from falling out from the tubular case.

(b) The fin forming body is exposed to the above-mentioned high-temperature exhaust gas even in a long-term continuous use environment in which the exhaust gas temperature becomes high, for example, about 1000 ° C. to 1200 ° C. due to high-load operation under the harsh usage environment of an automobile engine. It is not fixed to the tubular case by using a brazed part and a welding stop part that are melted and damaged. That is, the fin-forming body is stably held in the tubular case by the above-mentioned anti-rotation structure and anti-removal structure that are not likely to be destroyed even when exposed to high-temperature exhaust gas, and the fin-forming body is stable in the tubular case. Can be held as a target.

(c) The fin forming body is stably held in the tubular case by the above-mentioned anti-rotation structure and the retaining structure even when the vehicle body and the engine of the automobile violently vibrate, and the fin forming body is made into the tubular case. Can be held stably.

(d) The retaining member is not joined to the fins of the fin forming body, but holds the fin forming body in the tubular axial direction of the tubular case to prevent the fin forming body from coming off, and moves outward to the fin forming body. Make sure to prevent it from falling off. Here, the retaining member does not restrain the deformation of each fin in the plate longitudinal direction by the engagement with the retaining member, as compared with the one fixed to each fin of the fin forming body by welding or the like. .. As a result, the fin forming body can release the large thermal stress caused by the thermal strain without being blocked by the presence of the retaining member from the thermal strain in the plate longitudinal direction of each fin due to the exposure to the high temperature exhaust gas. It is not generated between the stopper member and is stably held by the retaining member.

As described in (d) above, the structure in which the retaining member does not restrain the deformation of each fin of the fin forming body in the plate longitudinal direction is such that the bending portion provided in each fin of (e) described later absorbs the thermal strain of each fin. It has the effect of not inhibiting the effect.

(e) The fin forming body may also be provided with a bent portion for absorbing thermal strain at an intermediate portion in the plate longitudinal direction of each fin.

In this case, the thermal strain of each fin in the fin forming body exposed to the high temperature exhaust gas is absorbed by the thermal deformation of the bent portion provided in the middle portion of the fin, and the detent portion at the end of each fin is absorbed. Since it is difficult to reach the surface, a large thermal stress is not generated around the detent portion, and the detent portion is not broken, the fin forming body can be stably held in the tubular case.

Further, the destruction due to the vibration generated in each fin of the fin forming body due to the violent vibration of the vehicle body and the engine can be prevented by using thick fins (for example, 0.8 to 3 mm) as compared with the metal foil or the metal honeycomb. Since it can be avoided by improving the strength, the fin forming body can be stably held in the tubular case.

(f) Inside the tubular case, a plurality of fin forming bodies arranged in order from one end side to the other end side along the exhaust passage of the tubular case are arranged. The inner peripheral area over the entire length of the tubular case that supports the catalyst and the total surface area of all fin-forming bodies can be increased, and the purification performance of the catalyst metal carrier can be improved.

(g) By making the fin forming body consist of an integral body carved so as to form a large number of plate-shaped fins, each fin has a plate thickness of, for example, 0.8 to 3 mm, more preferably 1 It has a plate shape of up to 2 mm, and the heat resistance and vibration resistance of the fin forming body can be secured, and the durability of the catalyst metal carrier can be easily secured.

(h) The fin forming body has an outer ring portion that is integrally connected with a large number of plate-shaped fins and is connected to the fins and surrounds the fins, and the outer ring portion is the inner peripheral surface of the tubular case. It is provided so as to engage with the detent portion provided in. An end portion of each fin of the fin forming body forming an integral body that intersects the inner peripheral surface of the tubular case is provided on the inner peripheral surface of the tubular case via an outer ring portion connected to the end portion. Can be simply and reliably provided to engage with.

FIG. 1 is a front view showing the catalyst metal carrier of the first embodiment. 2A and 2B show a catalyst metal carrier, FIG. 2A is a cross-sectional view taken along the line II-II of FIG. 1, and FIG. 2B is a cross-sectional view showing a modified example thereof. 3A and 3B show a tubular case, where FIG. 3A is a front view and FIG. 3B is a side view. FIG. 4 is a side view showing a detent member. 5A and 5B show fin-forming bodies, FIG. 5A is a front view, and FIG. 5B is a schematic view showing a modified example of fins. 6A and 6B show a retaining member, FIG. 6A is a front view, and FIG. 6B is a side view. FIG. 7 is a front view showing a retaining member. FIG. 8 is a front view showing a catalyst metal carrier of a reference example. 9A and 9B show a catalyst metal carrier, FIG. 9A is a side view, and FIG. 9B is a side view showing a modified example thereof. FIG. 10 is a side view showing a detent member. 11A and 11B show a plate constituting a plate structure to be a fin forming body, where FIG. 11A is a front view and FIG. 11B is a side view. FIG. 12 is a front view showing the plate assembly. FIG. 13 is a front view showing a tubular case into which a plate structure is inserted. FIG. 14 is a front view showing a retaining member.

(First Embodiment) (FIGS. 1 to 7)
The catalytic metal carrier 1 shown in FIGS. 1 and 2 is used by being connected to an outlet end portion (or an intermediate portion) of an exhaust pipe communicating with an exhaust port of an automobile engine. In the catalyst metal carrier 1, a metal fin forming body 20 is arranged inside an exhaust passage 11 formed by a cylindrical case 10 having a cylindrical shape or the like, and the surface of a large number of plate-shaped fins 21 included in the fin forming body 20. It is constructed by supporting a catalyst on the surface.

The catalyst metal carrier 1 is repeatedly heated and cooled each time the engine speed rises and falls, and the fins 21 of the fin forming body 20 restrained by the tubular case 10 under air cooling are joined to the tubular case 10. The part is in a harsh thermal environment because it is prone to generate large thermal stress and thus thermal fatigue due to large thermal strain. When the catalytic metal carrier 1 is used in a harsh long-term continuous use environment of an automobile engine, each fin 21 constituting the fin forming body 20 is exposed to the high heat of high-temperature exhaust gas due to high load operation, or the reaction of the catalyst. It is heated by receiving the heat generated by the engine, and further, the attached unburned gas is overheated by the afterfire generated by the explosion, which causes a larger thermal strain.

Further, the catalyst metal carrier 1 is repeatedly subjected to violent vibration due to violent vibration of the vehicle body and the engine, and a large repetitive stress is likely to be generated at the joint portion between each fin 21 of the fin forming body 20 and the tubular case 10. , In a harsh vibration environment.

The catalyst metal carrier 1 includes a tubular case 10, fin forming bodies 20, and retaining members 40 and 50 in order to ensure high durability even when used in the above-mentioned harsh thermal environment and vibration environment. It is assembled and configured as follows.

(Cylindrical case 10)
As shown in FIGS. 1, 2, and 3, the tubular case 10 is formed by bending, for example, a strip of stainless steel plate (for example, SUS430 material, plate thickness 1.5 mm) into a cylindrical shape, and both ends thereof are in a butt state. It is formed by welding by TIG welding or the like (welded portion W1).

(Fin forming body 20)
As shown in FIGS. 1, 2, and 5, the fin forming body 20 has a large number of plate-shaped fins 21 of, for example, stainless steel plates, and each fin 21 has an inner peripheral surface of the tubular case 10 in the longitudinal direction of the plate. A large number of small exhaust passages 12 are extended in the exhaust passage 11 by adjacent fins 21 so as to intersect the exhaust passage 11 and extend in the exhaust passage 11 along the tubular axis direction of the tubular case 10 in the plate width direction thereof. To partition.

The fin forming body 20 of the present embodiment is composed of an integral body carved so that a large number of plate-shaped fins 21 are integrated. In the present embodiment, the fin forming body 20 is formed by being machined from a stainless steel plate or block body by laser processing.

Here, as shown in FIG. 5, the fin forming body 20 of the present embodiment has a large number of plate-shaped fins 21 (12 in the present embodiment) at regular intervals in the circumferential direction from the central portion 22 (the present embodiment). It has an outer ring portion 23 that extends in the radial direction via (30 degree intervals) and is connected to the tip end portion of each fin 21 and surrounds the fin 21. The fin 21, the central portion 22, and the outer ring portion 23 form an integral body.

The fin forming body 20 of the present embodiment extends each fin 21 from the central portion 22 toward the outer ring portion 23 in a curved line (quadratic curve, cubic curve, etc.) such as a spiral line. However, each fin 21 may extend linearly along the radial direction from the central portion 22 toward the outer ring portion 23.

Further, in the fin forming body 20, the end portion of each fin 21 that intersects the inner peripheral surface of the tubular case 10 is provided on the inner peripheral surface of the tubular case 10 together with the outer ring portion 23 to prevent rotation. The portion 13 is provided so as to engage with the tubular case 10 in the circumferential direction and is prevented from rotating.

In the present embodiment, the key-shaped detent members 13A shown in FIG. 4 are provided at a plurality of positions (three positions in the present embodiment) forming a constant interval in the circumferential direction of the inner peripheral surface of the tubular case 10. .. A part of the detent member 13A is embedded in notch holes 13B (FIG. 3) provided at three positions in the circumferential direction of the tubular case 10 and is TIG welded from the outer peripheral surface side of the tubular case 10. It is welded and fixed (welded portion W2). The remaining portion of the detent member 13A except for the welded part projects inward of the tubular case 10 to form the detent portion 13.

On the other hand, in the fin forming body 20, a bent portion 24 recessed toward the inner diameter side is formed at a position corresponding to the detent portion 13 of the tubular case 10 in the circumferential direction of the outer ring portion 23, and the outer ring portion 23 is formed. The recess formed by the bent portion 24 on the outer peripheral surface is referred to as the detent groove portion 25. As a result, when the fin forming body 20 is inserted so as to fit on the inner peripheral surface of the tubular case 10, the detent groove portion 25 provided in the outer ring portion 23 of the fin forming body 20 is formed on the inner circumference of the tubular case 10. It engages with the above-mentioned detent portion 13 provided on the surface, and as a result, the fin forming body 20 is provided so as to engage in the circumferential direction of the tubular case 10 and is detented.

When the fin forming body 20 does not have the outer ring portion 23 connected to the tip end portion of each fin 21, the tip portion of each fin 21 is directly provided on the inner peripheral surface of the tubular case 10. The stopper may be provided so as to engage with the tubular case 10 in the circumferential direction to prevent rotation.

As shown in FIG. 5, the fin forming body 20 of the present embodiment is separated from the outer ring portion 23 in the circumferential direction at a plurality of positions (3 positions in the present embodiment) at regular intervals in the circumferential direction of the outer ring portion 23. , A separation portion 23R for absorbing thermal strain is provided.

In the fin forming body 20, a bent portion (for example, a U-shaped bent portion) 21R for absorbing thermal strain may be provided in the middle portion of each fin 21 in the plate longitudinal direction (FIG. 5 (B)). ..

Further, a plurality of catalyst metal carriers 1 of the present embodiment are arranged in order inside the tubular case 10 from one end side to the other end side along the exhaust passage 11 of the tubular case 10 (4 in the present embodiment). The fin forming body 20 is arranged. At this time, as shown in FIG. 1, the fin forming bodies 20 side by side are alternately inverted on the front and back sides, and the bending direction (swirl direction) of each fin 21 adjacent to each other between the fin forming bodies 20 adjacent to each other. ) Is placed in the opposite direction.

Here, when a plurality of fin forming bodies 20 are used and the fin forming bodies 20 arranged side by side from one end side to the other end side along the exhaust passage 11 of the tubular case 10 are alternately reversed on the front and back sides, the phases are arranged. The non-overlapping portions of the end faces of the fins 21 of the lined fin forming bodies 20 are exposed in the exhaust passage 11, and the surface area in contact between the catalyst and the exhaust gas is increased, so that the purification performance of the exhaust gas is improved. Further, by providing a portion in which the fins 21 do not overlap each other, a space is created on the exhaust downstream side of the fins 21 in the fin forming body 20 arranged on the upstream side so that the exhaust can flow in. Each of these spaces becomes an exhaust path that divides the exhaust flow into small pieces, and in the exhaust passage 11, the exhaust flows that pass through different paths interfere with each other, so that the flow is disturbed and becomes resistance, and the exhaust gas passes through the metal carrier 1. It takes longer to do. That is, the purification performance of the exhaust gas is further improved by increasing the contact time between the catalyst and the exhaust gas.

It should be noted that the plurality of arrayed fin forming bodies 20 are not limited to those that are inverted from each other, and are arranged so as to be offset from each other in the circumferential direction, inverted from each other, and arranged to be displaced from each other in the circumferential direction, or are not inverted from each other. It may be arranged without shifting in the circumferential direction.

When a plurality of fin forming bodies 20 are used and the fin forming bodies 20 arranged side by side from one end side to the other end side along the exhaust passage 11 of the tubular case 10 are arranged so as to be offset by θ degrees from each other in the circumferential direction, they are arranged side by side. The non-overlapping portions of the end faces of the fins 21 in the fin forming body 20 are exposed in the exhaust passage 11, and the surface area in contact between the catalyst and the exhaust gas is increased, so that the purification performance of the exhaust gas is improved. Further, by providing a portion in which the fins 21 do not overlap each other, a space is created on the exhaust downstream side of the fins 21 in the fin forming body 20 arranged on the upstream side so that the exhaust can flow in. Each of these spaces becomes an exhaust path that divides the exhaust flow into small pieces, and in the exhaust passage 11, the exhaust flows that pass through different paths interfere with each other, so that the flow is disturbed and becomes an exhaust resistance, and the exhaust gas becomes the metal carrier 1. It takes longer to pass through. That is, the purification performance of the exhaust gas is further improved by increasing the contact time between the catalyst and the exhaust gas.

Using a plurality of fin forming bodies 20, the fin forming bodies 20 arranged side by side from one end side to the other end side along the exhaust passage 11 of the tubular case 10 are alternately inverted on the front and back sides, and the fin forming bodies 20 arranged side by side are arranged. When the fins are arranged so as to be offset by θ degrees in the circumferential direction, the non-overlapping portions of the end faces of the fins 21 in the fin forming bodies 20 arranged side by side are exposed in the exhaust passage 11, and the surface area where the catalyst and the exhaust gas are in contact with each other increases. Exhaust gas purification performance is improved. Further, by providing a portion in which the fins 21 do not overlap each other, a space is created on the exhaust downstream side of the fins 21 in the fin forming body 20 arranged on the upstream side so that the exhaust can flow in. Each of these spaces becomes an exhaust path that divides the exhaust flow into small pieces, and in the exhaust passage 11, the exhaust flows that pass through different paths interfere with each other, so that the flow is disturbed and becomes an exhaust resistance, and the exhaust gas becomes the metal carrier 1. It takes longer to pass through. That is, the purification performance of the exhaust gas is further improved by increasing the contact time between the catalyst and the exhaust gas.

A plurality of fin forming bodies 20 are used, and the fin forming bodies 20 arranged side by side from one end side to the other end side along the exhaust passage 11 of the tubular case 10 are not inverted from each other and are not shifted in the circumferential direction (same direction). When arranged (so that the fins 21 overlap each other), the cross-sectional area of the small exhaust flow path 12 of the small exhaust flow path 12 partitioned by the fins 21 and the fins 21 arranged side by side in the metal carrier 1 is a fin forming body. It is equal to the cross-sectional area of the small exhaust flow path 12 of the small exhaust flow path 12 in a single unit, and when the fin forming bodies 20 arranged side by side are alternately inverted on the front and back sides, or in the fin forming bodies 20 arranged side by side, the fins 21 are θ Since a wider cross-sectional area of the small exhaust flow path can be secured as compared with the case where the arrangement is staggered or a combination of both, the exhaust resistance can be reduced and the engine output can be improved. Further, the state in which the fins 21 of the fin forming bodies 20 arranged side by side overlap each other at the same position from the exhaust upstream side to the exhaust downstream side of the metal carrier 1 is synonymous with increasing the length of the fins 21 in the plate width direction. Since the effect of rectifying the exhaust gas inside the metal carrier 1 can also be obtained, the reduction of the exhaust gas becomes more remarkable.

(Retaining members 40, 50)
The retaining members 40 and 50 prevent the fin forming body 20 from falling off from the tubular case 10. The retaining members 40 and 50 are attached to the end faces of the fins 21 in the fin forming body 20 in the plate width direction without being welded or joined to the fin forming body 20, and the tubular case is provided. Fixed to the inner peripheral surfaces of both the exhaust upstream side and the exhaust downstream side of the exhaust 10, the fin forming body 20 is held in the tubular axial direction of the tubular case 10 to prevent the fin forming body 20 from falling off to the exhaust upstream side and the exhaust downstream side. To prevent.

In the present embodiment, as shown in FIG. 2A, the two retaining members 40 are fixed to the inner peripheral surfaces of both the exhaust downstream side and the exhaust upstream side of the tubular case 10 and 1 The retaining members 50 were fixed to the inner peripheral surface of the retaining member 40 provided on the downstream side of the exhaust.

As shown in FIG. 6, the retaining member 40 of the present embodiment is made of, for example, a ring-shaped body made of a stainless steel plate. The retaining member 40 is inserted into the inner peripheral surface of the tubular case 10 into which the fin forming body 20 has been inserted so as to be fitted from both the outer sides of the exhaust upstream side and the exhaust downstream side of the tubular case 10. It is welded to the inner peripheral surface of the case 10. Specifically, in the slit portions 14 provided at a plurality of positions (three positions in the present embodiment) at regular intervals in the circumferential direction of the tubular case 10, the outer peripheral surfaces of the tubular case 10 and the retaining member 40 are provided. Is welded by TIG welding or the like (welded portion W3). At this time, although the end face of the retaining member 40 is arranged relative to the end face of the outer ring portion 23 of the fin forming body 20, it is attached to the outer ring portion 23 without being joined to the outer ring portion 23. Will be set up.

The retaining member 40 has a notch recess 41 on the inner peripheral surface of the tubular case 10 that receives the protruding portion of the detent portion 13 projecting outward from the detent groove portion 25 of the fin forming body 20. It is provided at three positions in the circumferential direction of one end face of the retaining member 40.

The retaining member 50 of the present embodiment is made of, for example, stainless steel, and as shown in FIG. 7, for example, three rod-shaped portions 52 extending radially from the central portion 51 in the circumferential direction at intervals of, for example, 120 degrees. The tip portion of each rod-shaped portion 52 projects on both sides in the circumferential direction, and the rod-shaped portion 52 and the rod-shaped portion 52 form a T-shaped mounting portion 53. The retaining member 50 is inserted so as to fit on the inner peripheral surface of the retaining member 40, and each mounting portion 53 is attached to the inner peripheral surface of the retaining member 40, and the peripheral portion (this) of the mounting portion 53 is attached. In the embodiment, three places facing the outside of the tubular case 10) are welded to the inner peripheral surface of the retaining member 40 by TIG welding or the like (welded portion W4). At this time, the rod-shaped portion 52 of the retaining member 50 is arranged on the front surface of each fin 21 in the fin forming body 20, but is attached to the fins 21 without being joined to the fins 21.

In the catalyst metal carrier 1, only the retaining member 40 or only the retaining member 50 can be used as the retaining member for the fin forming body 20. When only the retaining member 50 is used, the mounting portion 53 of the retaining member 50 is directly welded and fixed to the inner peripheral surface of the tubular case 110 by TIG welding or the like.

On the exhaust upstream side of the tubular case 10 where the fin forming body 20 is arranged, as shown in FIG. 2B, the inner diameter of the tubular case 10 is connected to the connection end of the exhaust pipe 60 to which the tubular case 10 is connected. When the small-diameter portion 61 to be inserted into the portion is provided, the small-diameter portion 61 of the exhaust pipe 60 serves as a retaining member on the upstream side of the exhaust, and the retaining members 40 and 50 in the present embodiment are exhausted from the tubular case 10. It is not always necessary to provide it at the upstream end. That is, the small diameter portion 61 of the exhaust pipe 60 is inserted into the inner diameter portion of the tubular case 10, and the end surface of the small diameter portion 61 is abutted against the end surface of the outer ring portion 23 of the fin forming body 20 to be arranged so that the fin forming body is formed. Prevents the 20 from falling out of the tubular case 10.

Here, the catalyst metal carrier 1 is assembled as follows, for example.
(1) A plurality of fin forming bodies 20 are arranged side by side and inserted so as to fit on the inner peripheral surface of the tubular case 10. At this time, the detent groove portion 25 provided in the outer ring portion 23 of the fin forming body 20 is engaged with the detent portion 13 provided on the inner peripheral surface of the tubular case 10, and the fin forming body 20 is the circumference of the tubular case 10. It is provided so as to engage in the direction and is detented.

(2) Each of the two retaining members 40 is inserted from both the outside of the exhaust upstream side and the exhaust downstream side of the tubular case 10 so as to fit into the inner peripheral surface of the tubular case 10, and the tubular case 10 is inserted. In the slit portion 14 provided in 10, the tubular case 10 and the outer peripheral surface of the retaining member 40 are welded and fixed by TIG welding or the like.

(3) The retaining member 50 is inserted into the inner peripheral surface of the retaining member 40 provided on the exhaust downstream side of the above-mentioned (2) in the tubular case 10 so as to be fitted, and the attachment portion 53 of the retaining member 50 is inserted. The peripheral portion of is welded to the inner peripheral surface of the retaining member 40 by TIG welding or the like to be fixed.

The catalyst metal carrier 1 assembled as described above has a catalyst (oxidation catalyst, reduction catalyst, or three-way catalyst) on the inner peripheral surface of the tubular case 10, the fin forming body 20, and the surfaces of the retaining members 40 and 50. Etc.) are applied, baked and supported.

Therefore, according to the catalyst metal carrier 1 of the present embodiment, the following effects are exhibited.
(a) The ends of the plate-shaped fins 21 of the fin forming body 20 that intersect the inner peripheral surface of the tubular case 10 are brazed to the inner peripheral surface of the tubular case 10 without being welded. The detent portion 13 provided on the inner peripheral surface is provided so as to engage with the detent portion 13 in the circumferential direction of the tubular case 10 to prevent detent. Further, a retaining member 40 for preventing the fin forming body 20 from falling off from the tubular case 10 is fixedly supported by both ends of the exhaust upstream side and the exhaust downstream side of the tubular case 10, and is supported by the retaining member. 50 is fixedly supported by the end of the tubular case 10 on the downstream side of the exhaust gas, and holds the fin forming body 20 in the tubular axial direction of the tubular case 10. Therefore, the fin forming body 20 is prevented from rotating inside the tubular case 10 and is also held in the axial direction, is stably held by the tubular case 10, and is prevented from falling out from the tubular case 10. To.

(b) The fin forming body 20 is exposed to the high temperature exhaust gas even in a long-term continuous use environment in which the exhaust gas temperature becomes high, for example, about 1000 ° C. to 1200 ° C. due to high load operation under the harsh usage environment of the automobile engine. It is not fixed to the tubular case 10 by using a brazing portion that is melted and damaged. That is, the fin forming body 20 is stably held in the tubular case 10 by the above-mentioned detent structure and retaining structure that are not likely to be destroyed even when exposed to high temperature exhaust gas, and the fin forming body 20 is tubular. It can be stably held in the case 10.

(c) The fin forming body 20 is stably held in the tubular case 10 by the above-mentioned anti-rotation structure and the retaining structure even when the vehicle body and the engine of the automobile violently vibrate, and the fin forming body 20 is held in a cylinder. It can be stably held in the shape case 10.

(d) The retaining members 40 and 50 are not joined to the fins 21 of the fin forming body 20, and the fin forming body 20 is prevented from coming off only by holding the fin forming body 20 in the tubular axial direction of the tubular case 10. However, the fin forming body 20 is surely prevented from falling off to the outside. Here, the retaining members 40 and 50 are deformed in the plate longitudinal direction in each fin 21 as compared with those fixed to the fins 21 of the fin forming body 20 by welding or the like. There is no restraint due to the relationship with. As a result, the fin forming body 20 is caused by this thermal strain without being blocked by the presence of the retaining members 40 and 50 from the thermal strain of each fin 21 in the plate longitudinal direction due to exposure to the high temperature exhaust gas. A large thermal stress is not generated between the retaining members 40 and 50, and the retaining members 40 and 50 stably hold the stress.

As described in (d) above, the retaining members 40 and 50 do not restrain the deformation of each fin 21 of the fin forming body 20 in the plate longitudinal direction due to the bent portion 21R provided in each fin 21 described later (e). It has the effect of not inhibiting the effect of absorbing thermal strain of each fin 21.

(e) The fin forming body 20 may be provided with a bent portion 21R for absorbing thermal strain at an intermediate portion of each fin 21 in the plate longitudinal direction.

In this case, the thermal strain of each fin 21 in the fin forming body 20 exposed to the high temperature exhaust gas is absorbed by the thermal deformation of the bent portion 21R provided in the middle portion of the fin 21, and the end of each fin 21 is absorbed. It is possible to make it difficult to reach the detent portion 13 of the tubular case 10 engaged in the detent groove portion 25 of the portion, to prevent a large thermal stress from being generated around the detent portion 13, and to destroy the detent portion 13. Therefore, the fin forming body 20 can be stably held in the tubular case 10.

Further, the destruction due to the vibration caused by the violent vibration of the vehicle body and the engine is caused by making the plate thickness of the fin 21 thick, for example 0.8 to 3 mm, and improving the strength of the fin forming body 20. Since it can be avoided, the fin forming body 20 can be stably held in the tubular case 10.

(f) Inside the tubular case 10, a plurality of fin forming bodies 20 arranged in order from one end side to the other end side along the exhaust passage 11 of the tubular case 10 are arranged. The inner peripheral area over the entire length of the tubular case 10 carrying the catalyst and the total surface area of all the fin forming bodies 20 can be increased, and the purification performance of the catalyst metal carrier can be improved.

(g) By assuming that the fin forming body 20 is an integral body obtained by carving out a large number of plate-shaped fins 21 so as to be integrated, each fin 21 is more preferably having a plate thickness of, for example, 0.8 to 3 mm. The fin forming body 20 has a plate shape of 1 to 2 mm, and the heat resistance and vibration resistance of the fin forming body 20 can be ensured, and the durability of the catalyst metal carrier can be easily ensured.

(h) The fin forming body 20 has an outer ring portion 23 that is integrally connected with a large number of plate-shaped fins 21 and is connected to the fins 21 and surrounds the fins 21, and the outer ring portion 23 is a cylinder. It is provided so as to engage with the detent portion 13 provided on the inner peripheral surface of the case 10. An end portion of each fin 21 of the fin forming body 20 forming an integral body that intersects the inner peripheral surface of the tubular case 10 is attached to the inner peripheral surface of the tubular case 10 via an outer ring portion 23 connected to the end portion. It can be simply and surely provided so as to engage with the provided detent portion 13.

( Reference example ) (FIGS. 8 to 14)
The catalyst metal carrier 2 shown in FIGS. 8 and 9 is substantially different from the catalyst metal carrier 1, in that the fin forming body 120 is composed of a plate assembly 130 in which a plurality of metal plates are combined. There is.

That is, the catalyst metal carrier 2 is used by being connected to an outlet end portion (or an intermediate portion) of an exhaust pipe communicating with an exhaust port of an automobile engine. In the catalyst metal carrier 2, metal fin forming bodies 120 are arranged inside an exhaust passage 111 formed by a cylindrical case 110 such as a cylindrical case 110, and the surfaces of a large number of plate-shaped fins 121 included in the fin forming bodies 120 are arranged. It is constructed by supporting a catalyst on the surface.

The catalyst metal carrier 2 is repeatedly heated and cooled each time the engine speed rises and falls, and the fins 121 of the fin forming body 120 restrained by the tubular case 110 under air cooling are joined to the tubular case 110. The part is in a harsh thermal environment because it is prone to generate large thermal stress and thus thermal fatigue due to large thermal strain. When the catalytic metal carrier 2 is used in a harsh long-term continuous use environment of an automobile engine, each fin 121 constituting the fin forming body 120 is exposed to the high heat of high-temperature exhaust gas due to high load operation, or the reaction of the catalyst. It is heated by receiving the heat generated by the engine, and further, the attached unburned gas is overheated by the afterfire generated by the explosion, which causes a larger thermal strain.

Further, the catalyst metal carrier 2 is repeatedly subjected to violent vibration due to violent vibration of the vehicle body and the engine, and a large repetitive stress is likely to be generated at the joint portion between each fin 121 of the fin forming body 120 and the tubular case 110. , In a harsh vibration environment.

The catalyst metal carrier 2 has the following tubular case 110, fin forming body 120, and retaining member 140 in order to ensure high durability even when used in the above-mentioned harsh thermal environment and vibration environment. It is assembled and constructed as follows.

(Cylindrical case 110)
As shown in FIGS. 8, 9, and 13, the tubular case 110 is formed by bending, for example, a strip of stainless steel plate (for example, SUS430 material, plate thickness 1.5 mm) into a cylindrical shape, and both ends thereof are in a butt state. It is formed by welding by TIG welding or the like (welded portion W1).

(Fin forming body 120)
As shown in FIGS. 8, 9, 12, and 13, the fin forming body 120 has a plate-shaped fin 121 made of a large number of, for example, stainless steel plates, and each fin 121 has a tubular case 110 in the longitudinal direction of the plate. It extends in the exhaust passage 111 so as to intersect the inner peripheral surface of the stainless steel and along the tubular axis direction of the tubular case 110 in the plate width direction, and a large number of small pieces are formed in the exhaust passage 111 by adjacent fins 121. The exhaust flow path 112 is partitioned.

The fin forming body 120 of this reference example is composed of a plate assembly 130 in which a plurality of stainless steel plate plates 131 (first and second plates 131A and 131B) are combined, and each fin 121 is formed by these plates 131. It is supposed to be formed. In this reference example , each plate 131 (first and second plates 131A, 131B) constituting the plate assembly 130 is formed by a press-molded body as shown in FIG.

Here, the plate structure 130 of this reference example constituting the fin forming body 120 is composed of the first and second small sets 130A and 130B. The first small assembly 130A is configured to have a first plate 131A, and the second small assembly 130B is configured to have a second plate 131B. As shown in FIG. 12, each of the substructures 130A and 130B is abutted so that each of the three plates 131A and 131B forms a triangle with each other, and two plates abutting each other at each apex of the triangle. The plate 131A and the plate 131A, or the plate 131B and the plate 131B are provided at both ends in the plate longitudinal direction at both ends in the plate width direction as shown in FIG. It becomes a small assembly that forms.

At this time, as shown in FIG. 11, the first and second plates 131A and 131B are provided with slits 131S extending from one end portion along the plate width direction to the intermediate portion. Then, as shown in FIG. 12, in the small assembly 130A and 130B constituting the plate assembly 130, the solid portion of the plate 131A in one small assembly 130A is fitted into the slit 131S of the plate 131B in the other small assembly 130B. The solid portion of the plate 131B in the other small assembly 130B is fitted into the slit 131S of the plate 131A in the one small assembly 130A, and the plates 131A and 131B are welded by TIG welding or the like at each of the fitting portions. The plate assembly 130 is formed (welded portion W2).

Further, in the fin forming body 120, the end portion of each fin 121 intersecting the inner peripheral surface of the tubular case 110 (in this reference example , the plate 131 (first and second plates 131A) in the plate assembly 130. , 131B), the tip portion 131F) is provided so as to engage with the detent portion 113 provided on the inner peripheral surface of the tubular case 110 in the circumferential direction of the tubular case 110 to prevent rotation.

In this reference example , the key-shaped detent member 113A shown in FIG. 10 is provided at a plurality of positions (6 positions in this reference example ) forming a constant interval in the circumferential direction of the inner peripheral surface of the tubular case 110. A part of the detent member 113A is embedded in notches 113B provided at six positions in the circumferential direction of the tubular case 110, and is fixed by being welded from the outer peripheral surface side of the tubular case 110 by TIG welding or the like. (Welded portion W3). The remaining portion of the detent member 113A except for the welded part projects inward of the tubular case 110 to form the detent portion 113.

As a result, when the fin forming body 120 is inserted so as to be fitted to the inner peripheral surface of the tubular case 110, the plates 131A are formed in the small braiding bodies 130A and 130B of the plate braiding body 130 constituting the fin forming body 120. , Each mounting interval portion G formed by the bent tip portion 131F of 131B engages with the above-mentioned detent portion 113 provided on the inner peripheral surface of the tubular case 110, and as a result, the fin forming body 120 The tubular case 110 is provided so as to engage in the circumferential direction and is prevented from rotating.

In the fin forming body 120, as shown in FIGS. 8, 11 and 12, a bent portion 121R for absorbing thermal strain (in this reference example , the plate 131 (131A, 131A,) is formed in the middle portion of each fin 121 in the plate longitudinal direction. A U-shaped bent portion 131R) provided in the middle portion in the longitudinal direction of the plate of 131B) is provided.

In the catalyst metal carrier 2 of this reference example , one fin forming body 120 (a plate structure 130 composed of the first and second small sets 130A and 130B) is arranged inside the tubular case 110. .. However, in the catalyst metal carrier 2, a plurality of fin forming bodies 120 arranged in order from one end side to the other end side along the exhaust passage 111 of the tubular case 110 are arranged inside the tubular case 110. It may be done.

When a plurality of fin forming bodies 120 are used and the fin forming bodies 120 arranged side by side from one end side to the other end side along the exhaust passage 111 of the tubular case 110 are arranged so as to be offset by θ degrees from each other in the circumferential direction. The non-overlapping portions of the end faces of the fins 121 in the fin forming body 120 are exposed in the exhaust passage 111, and the surface area in contact between the catalyst and the exhaust gas is increased, so that the purification performance of the exhaust gas is improved. Further, by providing a portion in which the fins 121 do not overlap each other, a space where exhaust gas can flow in is created on the exhaust downstream side of the fins 121 in the fin forming body 120 arranged on the upstream side. Each of these spaces becomes an exhaust path that divides the exhaust flow into small pieces, and in the exhaust passage 111, the exhaust flows that pass through different paths interfere with each other, so that the flow is disturbed and becomes an exhaust resistance, and the exhaust gas becomes the metal carrier 2 It takes longer to pass through. That is, the purification performance of the exhaust gas is further improved by increasing the contact time between the catalyst and the exhaust gas.

A plurality of fin forming bodies 120 are used, and the fin forming bodies 120 arranged side by side from one end side to the other end side along the exhaust passage 111 of the tubular case 110 are not displaced from each other in the circumferential direction (the same direction and their fins). When arranged so that the 121s overlap each other), the cross-sectional area of the small exhaust flow path 112 defined by the fins 121 in the metal carrier 2 and the fins 121 aligned with the fins 121 is the small exhaust gas in the fin forming body 120 alone. This is because it is equal to the cross-sectional area of the small exhaust flow path of the flow path 112, and a wider cross-sectional area of the small exhaust flow path can be secured as compared with the case where the fins 121 are arranged so as to be offset by θ degrees from each other in the circumferential direction in the fin forming bodies 120 arranged side by side. , Exhaust resistance can be reduced and engine output can be improved. Further, the state in which the fins 121 of the fin forming bodies 120 arranged side by side overlap each other at the same position from the exhaust upstream side to the exhaust downstream side of the metal carrier 2 is synonymous with increasing the length of the fins 121 in the plate width direction. Since the effect of rectifying the exhaust gas inside the metal carrier 2 can also be obtained, the reduction of the exhaust gas becomes more remarkable.

(Retaining member 140)
The retaining member 140 prevents the fin forming body 120 from falling off from the tubular case 110. The retaining member 140 of the tubular case 110 is attached to the end face of each fin 121 in the fin forming body 120 in the plate width direction without being welded or joined to the fin forming body 120. It is fixed to the inner peripheral surfaces of both the exhaust upstream side and the exhaust downstream side, and holds the fin forming body 120 in the tubular axial direction of the tubular case 110 to prevent the fin forming body 120 from falling off to the exhaust upstream side and the exhaust downstream side. ..

On the exhaust upstream side of the tubular case 110 where the fin forming body 120 is arranged, as shown in FIG. 9B, the inner diameter of the tubular case 110 is connected to the connection end of the exhaust pipe 160 to which the tubular case 110 is connected. When the small diameter portion 161 to be inserted into the portion is provided, the small diameter portion 161 of the exhaust pipe 160 serves as a retaining member on the exhaust upstream side, and the retaining member 140 in this reference example is used on the exhaust upstream side of the tubular case 110. It is not always necessary to provide it at the end of the. That is, the small diameter portion 161 of the exhaust pipe 160 is inserted into the inner diameter portion of the tubular case 110, and the end surface of the small diameter portion 161 is arranged so as to abut against the end surface of the tip portion 131F of the plate 131 in the fin forming body 120. The forming body 120 is prevented from falling off from the tubular case 110.

The retaining member 140 of this reference example is made of, for example, stainless steel, and as shown in FIG. 14, for example, six rod-shaped portions 142 extending radially from the central portion 141 in the circumferential direction at intervals of, for example, 60 degrees. It also has a mounting portion 143 that projects on both sides in the circumferential direction at the tip of each rod-shaped portion 142 and forms a T-shape together with the rod-shaped portion 142. The retaining member 140 is inserted so as to fit on the inner peripheral surface of the tubular case 110, and each mounting portion 143 is attached to the inner peripheral surface of the tubular case 110, and the peripheral portion (this) of the mounting portion 143 is attached. In the reference example , (three locations facing the outside of the tubular case 110) are welded to the inner peripheral surface of the tubular case 110 by TIG welding or the like (welded portion W4). At this time, the rod-shaped portion 142 of the retaining member 140 is arranged on the front surface of each fin 121 in the fin forming body 120, but is attached to the fins 121 without being joined to the fins 121.

Here, the catalyst metal carrier 2 is assembled as follows, for example.
(1) The fin forming body 120 made of the plate assembly 130 is inserted so as to fit on the inner peripheral surface of the tubular case 110. At this time, the mounting interval portion G formed on the bent tip portion 131F of the plate assembly 130 constituting the fin forming body 120 is engaged with the detent portion 113 provided on the inner peripheral surface of the tubular case 110. The fin forming body 120 is provided so as to engage with the tubular case 110 in the circumferential direction and is prevented from rotating.

(2) Each of the two retaining members 140 is inserted from each of the exhaust upstream side and the exhaust downstream side of the tubular case 110 so as to fit into the inner peripheral surface of the tubular case 110, and the retaining member 140 The peripheral portion of the mounting portion 143 is welded to the inner peripheral surface of the tubular case 110 by TIG welding or the like to be fixed.

The catalyst metal carrier 2 assembled as described above has a catalyst (oxidation catalyst, reduction catalyst, ternary catalyst, etc.) on the inner peripheral surface of the tubular case 110, the fin forming body 120, and the surface of the retaining member 140. Is applied, baked and supported.

Therefore, according to the catalyst metal carrier 2 of this reference example, the following effects are exhibited.
(a) The ends of the plate-shaped fins 121 of the fin forming body 120 that intersect the inner peripheral surface of the tubular case 110 are brazed to the inner peripheral surface of the tubular case 110 without being welded. The detent portion 113 provided on the inner peripheral surface is provided so as to engage with the detent portion 113 in the circumferential direction of the tubular case 110 to detent the detent. Further, a retaining member 140 for preventing the fin forming body 120 from falling off from the tubular case 110 is fixedly supported by the ends of the tubular case 110 on the exhaust upstream side and the exhaust downstream side, and the fin forming body 120 is supported. The 120 is held in the tubular axial direction of the tubular case 110. Therefore, the fin forming body 120 is prevented from rotating inside the tubular case 110 and is also held in the axial direction, is stably held by the tubular case 110, and is prevented from falling out from the tubular case 110. Be prevented.

(b) The fin forming body 120 is exposed to the high temperature exhaust gas even in a long-term continuous use environment in which the exhaust gas temperature becomes high, for example, about 1000 ° C. to 1200 ° C. due to high load operation under the harsh usage environment of the automobile engine. It is not fixed to the tubular case 110 by using a brazing portion that is melted and damaged. That is, the fin forming body 120 is stably held in the tubular case 110 by the above-mentioned anti-rotation structure and the retaining structure that does not cause destruction even when exposed to high-temperature exhaust gas, and the fin forming body 120 is tubular. It can be stably held in the case 110.

(c) The fin forming body 120 is stably held in the tubular case 110 by the above-mentioned anti-rotation structure and the retaining structure even when the vehicle body and the engine of the automobile violently vibrate, and the fin forming body 120 is held in a cylinder. It can be stably held in the shape case 110.

(d) The retaining member 140 is not joined to the fins 121 of the fin forming body 120, and the fin forming body 120 is prevented from coming off only by holding the fin forming body 120 in the tubular axial direction of the tubular case 110. The fin forming body 120 is surely prevented from falling off to the outside. Here, the retaining member 140 restrains the deformation of each fin 121 in the plate longitudinal direction by the engagement with the retaining member 140, as compared with the one fixed by welding or the like to each fin 121 of the fin forming body 120. There is nothing to do. As a result, the fin forming body 120 is not prevented from the thermal strain in the plate longitudinal direction of each fin 121 due to exposure to the high temperature exhaust gas by the presence of the retaining member 140, and the large heat caused by this thermal strain is not blocked. No stress is generated between the retaining member 140 and the retaining member 140, and the stress is stably held by the retaining member 140.

As described in (d) above, the retaining member 140 does not restrain the deformation of each fin 121 of the fin forming body 120 in the plate longitudinal direction. It has the effect of not inhibiting the effect of absorbing the thermal strain of 121.

(e) The fin forming body 120 may be provided with a bent portion 121R for absorbing thermal strain at an intermediate portion of each fin 121 in the plate longitudinal direction.

In this case, the thermal strain of each fin 121 in the fin forming body 120 exposed to the high temperature exhaust gas is absorbed by the thermal deformation of the bent portion 121R provided in the intermediate portion of the fin 121, and the tip of each fin 121 is absorbed. Since it is difficult to reach the detent portion 113 of the tubular case 110 in which the portion 131F is engaged, a large thermal stress is not generated around the detent portion 113, and the detent portion 113 is not destroyed, the fin forming body is formed. The 120 can be stably held in the tubular case 110.

Further, the vibration generated in the fin forming body 120 due to the violent vibration of the vehicle body and the engine can be avoided by making the plate thickness of the fin 121 thick, for example 0.8 to 3 mm, and improving the strength of the fin forming body 120. Therefore, the fin forming body 120 can be stably held in the tubular case 110.

(f) Inside the tubular case 110, a plurality of fin forming bodies 120 arranged in order from one end side to the other end side along the exhaust passage 111 of the tubular case 110 are arranged. The inner peripheral area of the tubular case 110 that supports the catalyst over the entire length and the total surface area of all the fin forming bodies 120 can be increased, and the purification performance of the catalyst metal carrier can be improved.

(g) By assuming that the fin forming body 120 is made of a plate assembly 130 in which a plurality of metal plates are combined, each fin 121 has a plate thickness of, for example, 0.8 to 3 mm, more preferably 1 to 2 mm. It has a plate shape, and the heat resistance strength, vibration resistance, etc. of the fin forming body 120 can be ensured, and the durability of the catalyst metal carrier can be easily ensured.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like within a range that does not deviate from the gist of the present invention. Included in the present invention. For example, in the fin forming body, the bending portion provided in the intermediate portion in the plate longitudinal direction of each fin is not limited to one intermediate portion in the plate longitudinal direction of the fin, and may be provided in each of a plurality of intermediate locations. ..

Further, in the fin forming body, the bent portion provided in each fin is not limited to the one in which the bent portion is formed as a curved portion different from other positions at a local position in the plate longitudinal direction, and the fin is used as a plate. It may be formed by being curved in a C-shape or an S-shape over a substantially total length in the longitudinal direction.

Further, the constituent materials such as the tubular case, the fin forming body, and the retaining member constituting the catalyst metal carrier are not particularly limited as long as they have excellent heat resistance.

According to the present invention, it is possible to provide a catalytic metal carrier capable of ensuring high durability under a harsh usage environment.

1 Catalytic metal carrier
10 tubular case
11 Exhaust passage
12 small exhaust flow path
13 Anti-rotation part
20 fin forming body
21 fins
21R Bent part 23 Outer ring part
40, 50 retaining member

Claims (3)

A catalytic metal carrier in which a metal fin-forming body is arranged inside an exhaust passage formed by a tubular case.
A large number of fin-forming bodies have a plate thickness of 0.8 to 3 mm, have plate-shaped fins formed by supporting a catalyst on the surface, and have a bent portion for absorbing heat strain in the middle portion in the plate longitudinal direction of each fin. Each fin extends in the exhaust passage so as to intersect the inner peripheral surface of the tubular case in the longitudinal direction of the plate, and a large number of small exhaust passages are partitioned in the exhaust passage by adjacent fins. ,
The end of each fin of the fin forming body that intersects the inner peripheral surface of the tubular case is provided so as to engage with the detent portion provided on the inner peripheral surface of the tubular case in the circumferential direction of the tubular case. As well as being stopped
The fin forming body is an integral body carved so that a large number of plate-shaped fins are integrated.
The fin forming body has an outer ring portion that is integrally connected with a large number of plate-shaped fins and is connected to the tip portions of the fins and surrounds the fins, and the outer ring portion is formed on the inner peripheral surface of the tubular case. It is configured to be provided so as to engage with the provided detent portion in the circumferential direction of the tubular case to prevent detent.
A retaining member for preventing the fin forming body from falling off from the tubular case holds the fin forming body in the tubular axial direction of the tubular case without being joined to the fins of the fin forming body. A catalytic metal carrier supported by the tubular case. The catalyst metal carrier according to claim 1, wherein a plurality of fin forming bodies arranged in order from one end side to the other end side along the exhaust passage of the tubular case are arranged inside the tubular case. The catalyst metal carrier according to claim 1 or 2 , wherein each fin of the fin forming body is provided with a bent portion for absorbing heat strain at an intermediate portion in the longitudinal direction of the plate for each portion that partitions each small exhaust flow path. ..

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