JPH08312338A - Exhaust emission control device - Google Patents

Abstract

PURPOSE: To promote the diffusion of exhaust gas and improvements in a flow straightening function by constituting a straightening body in stacking those of wave and plane band materials alternately into a layered form, and making up the extent of wave height and length at an exhaust gas outflow end of the straightening body in these wavy plane band materials to be larger than that at each exhaust gas inflow end. CONSTITUTION: A flow straightening body B consists in a truncated pyramid-form structure, and it is composed of stacking both wavy and plane band materials 1 and 2 alternately. In addition, this straightening body B is provided with both exhaust gas inflow and outflow ends B1, and an interval of both these ends is composed of a honeycomb structure by these band materials 1 and 2. Moreover, this straightening body B, as this wavy plane band material 1, is used as a wave-form structure, where wave height (t) and wavelength (λ) are increased, in proportion as leading to the exhaust gas outflow end B2 from the exhaust gas inflow end B1. On the other hand, in the plane band material 2, such one as being the same size as a plane form of the wavy plane band material 1 is used. With this constitution, exhaust gas is largely deflected in both vertical and horizontal directions is space between the inflow and B1 and the outflow end B2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to an exhaust gas purifying apparatus used by being inserted in an exhaust gas system. In particular, the present invention relates to a diffuser part that has one end connected to an exhaust pipe system and has a diameter enlarged to diffuse exhaust gas, a catalyst carrier part connected to the diffuser part, and a catalyst carrier part connected to the catalyst carrier part. The present invention relates to an exhaust gas purifying device that is configured with a confuser part that has a reduced diameter.

More specifically, the present invention relates to an exhaust gas rectifying body applied to the diffuser section and the confuser section,
In particular, it relates to an exhaust gas purifying device incorporating an exhaust gas rectifier of a new structure that not only functions as a pre-converter (pre-catalyzer) of the catalyst carrier part, in addition to its ability to diffuse exhaust gas when applied to a diffuser part. is there.

[0003]

2. Description of the Related Art Conventionally, for example, an exhaust gas system of an internal combustion engine is provided with a honeycomb structure carrying an exhaust gas purification catalyst (for example, a catalyst system using Pt, Rh, Pd, etc.) to purify the exhaust gas. That is a well known thing. As the honeycomb structure, a ceramic type (ceramic monolysis), a metal type (metal monolysis), or a composite thereof is known. Particularly in recent years, from the viewpoint of durability, a honeycomb body made of metal rather than ceramics (hereinafter referred to as a metal honeycomb body) has been actively researched and developed.

The ceramic or metal honeycomb body is fixed to a metal casing to be a catalyst carrier. In the industry, catalyst supports that use metal-based honeycomb bodies are metal supports and metal supports (Met
al Support) or Metal Subst
It may be displayed as an abbreviation (MS). Also in the present invention, the abbreviations (MS) described above
Is used. FIG. 9 is a perspective view of a metal carrier (MS) in which a wound type and a metal honeycomb body (H) having a circular cross section is housed in a metal casing (C). Also, FIG.
Reference numeral 0 shows a perspective view of a metal carrier (MS) in which a metal honeycomb body (H) of a wound type and having a racetrack shape in section (elliptical shape) is housed in a metal casing (C).

An exhaust gas purifying apparatus is constructed by applying the above-mentioned ceramic-based or metal-based catalyst carrier to an exhaust gas system of an internal combustion engine, more specifically to an exhaust gas pipeline. At that time, in the connection of the exhaust gas pipeline, in order to prevent the back pressure of the exhaust gas from becoming high in the catalyst carrier portion, the pipeline in the front part of the catalyst carrier portion has an expanded diameter portion (diffuser portion). ), The rear conduit is configured to have a reduced diameter portion (confusor portion).

The above-mentioned exhaust gas purifying device, that is, a diffuser portion whose one end is connected to the exhaust pipe and whose diameter is expanded in the exhaust gas flow direction, and which is connected to the diffuser portion and for purifying the exhaust gas From a catalyst carrier portion (for example, a metal carrier) (MS) having a honeycomb structure that supports a catalyst therein, and a confuser portion that is connected to the catalyst carrier portion and has a reduced diameter in a flow direction of exhaust gas In such an exhaust gas purifying apparatus, various measures have been proposed for utilizing the space space of the diffuser section and / or the confuser section.

For example, in the exhaust gas device having the above structure, Japanese Patent Publication No. 2-502110 has a rectifier of a specific structure for improving diffusion rectification of exhaust gas in the diffuser section and / or the confuser section. I suggest you do. The above-mentioned Toku Hyodai 2-502110 is a cross section in which, as a rectifying body arranged in the diffuser, a large number of passages through which exhaust gas flows are formed, and at least a part of these passages increases in the exhaust gas flow direction. Have proposed. Each of the flow paths has a cross section that decreases in the exhaust gas flow direction within the confuser.

In the rectifying body disclosed in Japanese Patent Publication No. 2-502110, the flow passage having a cross section increasing in the flow direction of the exhaust gas disposed in the diffuser is specifically shown below. Composed of things. (i) It is composed of flat plates and corrugated plates that are alternately laminated or wound, and the corrugated plate is provided with slits from the outflow end of the exhaust gas almost along the wave bottom (or crest) to near the inflow end. And the width of the slit is widened in the flow direction of the exhaust gas. And
In the corrugated plate, the corrugated side surface of the corrugated plate is formed more gently at the inflow end than at the outflow end. (ii) It is composed of two types of corrugated plates having substantially equal wavelengths and significantly different amplitudes (wave heights), and a flat plate interposed between the two types of corrugated plates, and has a cross section with a smaller corrugation. The corrugated plates are fitted into each other (embedded in each other) at the other part (exhaust gas inflow end side), and are separated from each other by the intermediate layer (flat plate) at the other part (exhaust gas outflow end side). To be done. (iii) A plurality of frustoconical channel modules or truncated pyramidal channel modules are bundled together. Furthermore, it is composed of frustoconical modules with increasing opening angles and arranged concentrically with one another.

[0009]

[Problems to be Solved by the Invention]
The rectifying body disposed in the diffuser portion disclosed in No. 502110 is superior to the conventional one in solving the problem of causing the exhaust gas flow to uniformly flow into the catalyst carrier portion. However, the following drawbacks must be pointed out.

Under the structure (i), a large slit portion is formed in the corrugated sheet, which is uneconomical. That is, this type of corrugated sheet has, for example, the same heat resistance as a member (a flat plate-shaped strip member and a corrugated sheet-shaped strip member) used for manufacturing a metal honeycomb body which is a main component of a metal carrier. It is recognized that thin steel plates (foil materials) resistant to high temperature oxidation are used, but these members (foil materials) are extremely expensive. Further, in the approach of (i), since the effective surface area of the rectifying body is greatly reduced due to the formation of the slit, even if an exhaust gas purifying catalyst is carried on the wall surface and is used as a precatalyzer, the exhaust gas purifying ability is reduced. Is extremely low. As will be described later, this point is a point greatly different from the present invention.

Further, in the above-mentioned approach (ii),
There are many members that make up the rectifying body (three types), and at the exhaust gas inflow end side, the corrugations of the two types of corrugated sheets fit (embed) with each other, increasing the back pressure due to the increase in thickness. However, there is a drawback that the effective surface area of the rectifying body is reduced.

Further, the approach (iii) has a difficulty (expensive) in manufacturing each of the truncated cone-shaped channel modules or the truncated pyramid-shaped channel modules, and the contact or contact between the modules may be difficult. This is accompanied by drawbacks such as reduction in effective surface area due to contact.

The present invention was devised to solve the above-mentioned drawbacks of the conventional rectifying body. The present inventor diligently studied to solve the above-mentioned problems of the conventional technology. As a result, the present inventor has found that a rectifying body composed of a flat strip and a corrugated strip having a specific corrugated structure is effective as an effective use of the space space of the diffuser section and / or the confuser section. It was Further, it has been found that the corrugated strip material having the above-mentioned specific corrugated structure is efficiently prepared from a flat strip material having a specific planar shape in view of the size of the space space.

The present invention is based on the above findings, and according to the present invention, it is excellent in the function of diffusing and rectifying exhaust gas, and also has a sufficient function as a preconverter (precatalyzer) of the catalyst carrier portion. (EN) An exhaust gas purifying device which holds a rectifying body which is held and which is economically excellent.

[0015]

The present invention will be summarized as follows.
The present invention relates to a catalyst having a honeycomb structure, one end of which is connected to an exhaust pipe and whose diameter is expanded in a flow direction of exhaust gas, and a honeycomb structure which is connected to the diffuser and carries an exhaust gas purifying catalyst therein. An exhaust gas purification system comprising a carrier part and a confuser part connected to the catalyst carrier part and having a reduced diameter in the exhaust gas flow direction, and at least one of the diffuser part and the confuser part has a rectifier inside thereof. In the device, (i) the rectifying body is configured by alternately laminating corrugated plate members and flat plate members, and (ii) the corrugated member, In the corrugated structure of the exhaust gas inflow end and the exhaust gas outflow end portion of the rectifier, the wave height and wavelength of the exhaust gas outflow end are respectively larger than the wave height and wavelength of the exhaust gas inflow end. When, to a exhaust gas purification device according to claim.

Hereinafter, the technical constitution and embodiments of the present invention will be described in detail with reference to the drawings. Needless to say, the present invention is not limited to the illustrated one.
Further, in the following description, the rectifying body arranged in the diffuser portion is almost the same as the rectifying body arranged in the diffuser portion, and is a reverse arrangement of the rectifying body. Will be explained only. Therefore, the technical constitution of the rectifying body arranged in the diffuser portion should be understood in the above-mentioned sense.

FIG. 1 is a sectional view in which a part of an exhaust gas purifying device (A) having a rectifying body (B) of a first embodiment arranged in a diffuser portion of the present invention is omitted. As shown in the figure, the exhaust gas purifying apparatus (A) of the present invention installed in the exhaust gas pipelines (E1, E2) has (i) one end portion of the exhaust pipe (E).
1) and a diffuser portion (A1) that is expanded in the exhaust gas flow direction, and (ii) is connected to the diffuser portion (A1) and has a honeycomb structure (H) carrying an exhaust gas purification catalyst. (Iii) a catalyst carrier part (A2) having therein a confuser which is connected to the catalyst carrier part (A2) and has a reduced diameter in the exhaust gas flow direction, and an end part which is connected to an exhaust pipe (E2). (A3), and (i
v) It comprises a rectifying body (B) disposed inside the diffuser section (A1). In addition, (F) in the figure
The inflow direction of exhaust gas is shown. In the present invention, as shown in FIG. 1, a space space (SP) may be provided between the rectifying body (B) and the catalyst carrier portion (A2), but the space space (SP) is not particularly provided. May be. When the space space (SP) is provided, the flow of the exhaust gas is turbulent here, so that the contact property between the exhaust gas and the catalyst is improved although the back pressure is slightly increased. Even if there is no space (SP), the rectifying body (B) having a honeycomb structure
Since the cells of the catalyst carrier part (A2) and the cells of the catalyst carrier part (A2) do not completely coincide with each other, turbulent flow occurs at the contact part between the two, but to a lesser extent than when a space space (SP) is provided,
At the same time, the degree of increase in back pressure is reduced. In consideration of the above, whether or not to provide the space space (SP) may be appropriately determined according to the design of the exhaust system.

2 to 5 are views for explaining the rectifying body (B) of the first embodiment. FIG. 2 is a perspective view in which the rectifying body (B) of the first embodiment is partially omitted, and FIG. 3 is a front view seen from the inflow end of exhaust gas. As shown in the figure, the rectifying body (B) of the present invention has a truncated pyramid-shaped structure, and the corrugated plate-shaped strip (1) and the flat plate-shaped strip (2) are alternately stacked (laminated). It is composed of The pyramidal trapezoidal rectifier (B) has an exhaust gas inflow end (B1) and an exhaust gas outflow end (B2), and a honeycomb structure made of strips (1, 2) between the both ends. Composed of the body.

The most characteristic features of the rectifying body (B) of the first embodiment of the present invention are shown in FIGS. 4 (a) and 4 (b). That is, as shown in FIG. 4 (a), the rectifying body (B) of the present invention is used as the corrugated strip material (1) from the exhaust gas inflow end portion (B1) to the exhaust gas outflow end portion (B1). It is characterized in that it has a corrugated structure in which the wave height (t) and the wavelength (λ) increase as it reaches B2). More specifically, as shown, the present invention provides t1 <t2, λ1 <λ.
A corrugated strip (2) satisfying the relationship of 2 is used. The size of the planar shape of the corrugated strip (1) is
It may be appropriately determined according to the size of the space space of the diffuser portion.

On the other hand, as the flat strip (2), as shown in FIG. 4 (b), a flat strip having the same size as the planar shape of the corrugated strip (1) is used. . In the present invention, the size of the flat strip (2) is the same as the planar shape of the corrugated strip as shown (2a in the figure).
Reference) or a part of it (2 in the figure)
Needless to say, it may be the case (see b, 2c).

FIGS. 5 (a) and 5 (b) are views for explaining an example of preparation of the corrugated strip (1). In the corrugated strip material (1) of the present invention, a substantially fan-shaped strip material (S) is corrugated so as to have a corrugated structure satisfying the above-mentioned requirements by using a desired corrugated roll. It may be processed.
In the present invention, when it is referred to as a substantially fan-shaped strip material (S), it should be noted that the above-mentioned “substantially fan-shaped” has a wide range of concepts as described later. In the substantially fan-shaped strip material (S) of FIG. 5A, the arc (a) (portion passing through (a) in the figure) and the arc (b) (portion passing through (b) in the figure) are concentric circles. It is a corresponding arc portion, and has respective radii of curvature (R) and (r).
By corrugating the strip material (S) of FIG.
It goes without saying that the relationship of = e ', c = c', d = d 'is maintained. The corrugation may be performed, for example, by drawing radiation having a desired radiation angle (center angle) from the center point of the concentric circles on the strip material (S) and making the radiation the top of the wave.

The corrugated strip (1) and the flat strip (2)
The rectifying body (B) of the first embodiment of the present invention constructed by using the exhaust gas from the inflow end portion (B1) to the outflow end portion (B2) of the exhaust gas as shown in FIGS. It can be largely deflected in the vertical direction and the horizontal direction. Therefore, the exhaust gas purifying ability is improved in the catalyst carrier portion (A2). Further, the rectifying body (B) of the present invention is composed of both strips (1,
Since it is composed of 2), it has a large effective surface area, and when the exhaust gas purifying catalyst is carried on its wall surface, it has a sufficient function as a preconverter (precatalyzer). In the rectifying body (B) of the present invention, at least a part of the abutting portion of the corrugated strip (1) and the flat strip (2), which are the constituent members, is firmly fixed by brazing or welding. It goes without saying that they will be fixed. Needless to say, the rectifying body (B) is fixed inside the diffuser portion by a desired fixing means.

In the present invention, the catalyst carrier portion (A2)
As the material, those known in the art may be adopted. That is, the catalyst carrier portion (A2) is mainly composed of a honeycomb structure for carrying an exhaust gas purifying catalyst having a honeycomb structure and a metal casing enclosing the honeycomb structure. The honeycomb structure may be a ceramic structure, a metal structure, or a combination thereof (composite body). As the honeycomb structure, a metal type, that is, a metal honeycomb body (H) will be described below. As the metal honeycomb body, for example, the one shown in FIG. 9 is a winding type, and the one shown in FIG. 10 is a race track type. 9 to 10, it is shown that the catalyst carrier portion (A2) is composed of a metal carrier (MS).

The winding type metal honeycomb body (H)
Is, for example, 100 μm or less (preferably 50 μm or less)
The corrugated strip material (1 ′) and the flat strip material (2 ′) made of heat-resistant thin steel sheets are stacked so as to have mutual abutting parts, which are wound together in a spiral shape. A honeycomb body (H) having a honeycomb structure having a large number of mesh-like ventilation holes (cells) (3 ') for exhaust gas passages formed in the axial direction is formed. In addition to the above-mentioned wound type and race track type as the metal honeycomb body in the art, a metal honeycomb body is manufactured from a corrugated strip material (1 ′) and a flat strip material (2 ′). Various structures are known depending on the difference in the method. For example, a layered type in which both strips are laminated in a layered manner, JP-A-62-27305
No. 0, JP-A-62-173051 and JP-A-1-218.
No. 637, Japanese Patent Publication No. 3-502660, Japanese Patent Laid-Open No. 4-22
Radial type, S-shaped type, tongue-shaped type, and X-wrap (swastoid) type metal honeycomb bodies disclosed in Japanese Patent No. 7855 and the like are known.

In the present invention, the corrugated plate-shaped strip (1 ') and the flat plate-shaped strip (2') used for producing the above-mentioned wound-type metal honeycomb body (H) are the usual ones. A strip material used for producing a metal monolith type metal honeycomb body, for example, chrome steel (chrome 1
3% to 25%), heat-resistant stainless steel such as Fe-Cr 20% -Al 5%, or heat-resistant stainless steel to which a rare earth metal (REM such as Ce or Y) is added to improve high-temperature oxidation resistance. Thickness of 30μm-1 such as stainless steel
A strip material of about 00 μm is used. In addition, both strips (1 ',
2 ') may be made of plates having different plate thicknesses, or may be made of different materials. In particular, corrugated strip (1 ') and flat strip (2')
It is preferable to heat-treat Al containing Al or Al having an Al layer on the surface thereof to deposit whisker-like or mushroom-like alumina (Al ₂ O ₃ ) on the surface thereof. The whisker-like alumina layer is preferable because it can firmly hold the washcoat layer for carrying the exhaust gas purifying catalyst such as Pt, Pd, and Rh.

In the present invention, the metal casing (C) enclosing the metal honeycomb body (H) uses the same kind of heat-resistant steel as the constituent strips (1 ′, 2 ′) of the metal honeycomb body (H). You may comprise. Alternatively, it may be made of another steel material having heat resistance and corrosion resistance, or may be made of a double structure having high heat resistance and corrosion resistance. An example of the latter double structure is one in which the inner part is made of ferritic stainless steel and the outer part is made of austenitic stainless steel.

The catalyst carrier portion (A2) consisting of the metal honeycomb body (H) and the metal casing (C), that is, the metal carrier (MS) is used under severe thermal conditions of the exhaust gas system. Therefore, the metal honeycomb body (H)
And the metal casing (C) are firmly fixed. This is a metal honeycomb body (H) and a metal casing (C)
Is exposed to the high temperature of the exhaust gas itself and the high temperature generated by the exothermic reaction between the exhaust gas and the exhaust gas purification catalyst, and large thermal stress is applied to each element in such a high temperature atmosphere. Therefore, it is firmly fixed by a fixing means such as brazing or welding so as to withstand thermal stress. Also,
Since the metal carrier (MS) is used under the application of severe vibration, the both components are firmly fixed from the viewpoint of improving vibration resistance. On the other hand, in the metal honeycomb body (H) itself, in order to ensure durability under the above-mentioned severe use conditions, the contact portion between the flat plate-shaped band member and the corrugated plate-shaped band member, which are its constituent members, is brazed. It is firmly fixed by fixing means such as welding or welding.

Various modifications of the rectifying body (B) of the present invention are possible. Hereinafter, modified examples will be described with reference to the drawings, but the present invention is not limited to these.

FIG. 6 is a view for explaining the rectifying body (B) of the second embodiment of the present invention, and is a view corresponding to FIG. 3 related to the first embodiment. The rectifying body (B) of the second embodiment is characterized in that the exhaust gas inflow end (B1) and the outflow end (B2) have circular front shapes. This kind of rectifying body (B) is useful as a rectifying body for the metal honeycomb body (H) having a circular front shape shown in FIG.

FIG. 7 is a diagram for explaining the rectifying body (B) of the third embodiment of the present invention, and is a diagram corresponding to FIG. 3 related to the first embodiment. The rectifying body (B) of the third embodiment is characterized in that the exhaust gas inflow end (B1) and the outflow end (B2) have a racetrack-shaped frontal shape. This kind of rectifying body (B) is useful as a rectifying body of the metal honeycomb body (H) whose front shape is a racetrack shape shown in FIG.

FIGS. 8 (a), (b), and (c) are strip materials (S) used for preparing the corrugated strip material (1) constituting the rectifying body (B) of the present invention. It shows a modified example of. 8 (a), (b), and (c) are diagrams corresponding to FIG. 5 (a). FIGS. 8A and 8B are useful for interpreting the term "substantially fan-shaped" in the present invention. The major difference between FIG. 8A and FIG. 5A is that the arc (b1
5) is that the radius of curvature is smaller than that of the arc (b) in FIG. A big difference between FIG. 8B and FIG. 5A is that the arc (b) of FIG. 5A is a straight line (b2). In the present invention, the term “substantially fan-shaped” is used as a general term for these shapes. As shown in FIG. 8C, the strip material (S) has a trapezoidal shape. Such a trapezoidal strip material (S) is prepared, for example, by punching a flat strip, but the flat strip is highly utilized and economical. The strip material (S) of FIG. 8 (a) is largely bent to the outflow end side at the exhaust gas inflow end portion when corrugated, but has a sufficient function of diffusing and rectifying the exhaust gas. 8 (b) and 8 (c), on the other hand, project forward, which also has a sufficient function of diffusing and rectifying exhaust gas.

[0032]

According to the present invention, in an exhaust gas purifying apparatus comprising a diffuser portion, a catalyst carrier portion, and a confuser portion, a rectifying body having a novel structure is arranged in at least one of the diffuser portion and the confuser portion to form an exhaust gas. It is characterized in that it constitutes a purifying device. The rectifying body of the present invention comprises a corrugated strip material prepared by corrugating a strip material having a substantially fan shape or a substantially trapezoidal shape, and a flat strip material interposed between the corrugated strip material. It is extremely economical because it is composed of different types of strips.

Further, since the rectifying body of the present invention has the same honeycomb structure as the honeycomb structure which is the main constituent element of the catalyst carrier portion, it has a large effective surface area and a preconverter (precatalyzer). It has a sufficient function as. Therefore, the rectifying body of the present invention is useful for downsizing of the catalyst carrier part, in other words, for downsizing of the exhaust gas purifying apparatus as a whole, by the diffusion / rectifying function of the exhaust gas and the above-mentioned pre-converter function. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an exhaust gas purification device of the present invention.

FIG. 2 is a perspective view of a rectifying body (B) according to the first embodiment of the present invention.

FIG. 3 is a front view of the rectifying body (B) according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating constituent members (a corrugated strip member and a flat strip member) of the rectifying body (B) according to the first embodiment of the present invention.

FIG. 5 is a diagram illustrating a preparation example of a constituent member (corrugated plate material) of the rectifying body (B) of the first embodiment of the present invention.

FIG. 6 is a front view of the rectifying body (B) according to the second embodiment of the present invention, and is a view corresponding to FIG. 3.

FIG. 7 is a front view of a rectifying body (B) according to a third embodiment of the present invention, and is a view corresponding to FIG. 3.

FIG. 8 is a diagram illustrating a modified example of a starting material (strip material) used to prepare a corrugated strip material that is a constituent member of the rectifying body (B) of the present invention, and FIG. ) Is a diagram corresponding to FIG.

FIG. 9 is a catalyst carrier portion (A) having a wound-type metal honeycomb body (H) that constitutes the exhaust gas purifying apparatus of the present invention.
2 is a perspective view of MS).

FIG. 10 is a racetrack (oval) type metal honeycomb body (H) constituting the exhaust gas purifying apparatus of the present invention.
FIG. 3 is a perspective view of a catalyst carrier portion (A2, MS) having

[Explanation of symbols]

 A ………… Exhaust gas purification device A1 ………… Diffuser part A2 ………… Catalyst support part A3 ………… Confusor part B ………… Rectifier B1 ………… Exhaust gas inflow end of rectifier B2 ………… Rectifier exhaust gas outflow end SP ………… Space E1, E2 ………… Exhaust gas pipe F ………… Exhaust gas flow 1 ………… Corrugated strip (for rectifier) ) 2 Flat strip (for rectifier) S Strip strip MS MS Metal carrier 1 '... Corrugated strip (for metal carrier) 2' … Flat plate material (for metal carrier) 3 '………… Cell

Claims (9)

[Claims] 1. A diffuser portion, one end of which is connected to an exhaust pipe and whose diameter is expanded in a flow direction of exhaust gas, and a honeycomb structure which is connected to the diffuser portion and carries an exhaust gas purifying catalyst therein. Exhaust gas comprising a catalyst carrier portion and a confuser portion connected to the catalyst carrier portion and having a diameter reduced in the exhaust gas flow direction, and at least one of the diffuser portion and the confuser portion has a rectifier inside thereof. In the purifying device, (i) the rectifying body is configured by laminating corrugated strips and flat strips alternately in a layered structure, and (ii) the corrugated strip is In the corrugated structure of the exhaust gas inflow end and the exhaust gas outflow end portion of the rectifier, the wave height and wavelength of the exhaust gas outflow end are respectively larger than the wave height and wavelength of the exhaust gas inflow end. Things, an exhaust gas purification device according to claim. 2. The exhaust gas purifying apparatus according to claim 1, wherein each of the corrugated plate-shaped strips forming the rectifying body is prepared by corrugating a substantially fan-shaped strip (S). 3. The exhaust gas purifying apparatus according to claim 1, wherein each of the corrugated plate-shaped strips constituting the rectifying body is prepared by corrugating a substantially trapezoidal strip material (S). 4. The exhaust gas purifying apparatus according to claim 1, wherein each of the flat plate-shaped strips constituting the rectifying body has the same shape as that of each corrugated strip-shaped strip. 5. The exhaust gas according to claim 1, wherein each of the flat strips forming the rectifying body has the same shape as the planar shape of the desired width of each corrugated strip when viewed in the flow direction of the exhaust gas. Purification device. 6. The exhaust gas purification device according to claim 5, wherein the desired width is set to a desired width from the exhaust gas outflow end of each corrugated strip. 7. The exhaust gas purifying apparatus according to claim 1, wherein the rectifying body has a truncated pyramid shape. 8. The exhaust gas purifying apparatus according to claim 1, wherein the exhaust gas inflow end and the outflow end of the rectifying body have racetrack-shaped front faces. 9. The exhaust gas purifying apparatus according to claim 1, wherein the rectifying body has a truncated cone shape.