JPH05103991A - Exhaust gas purifier - Google Patents

Abstract

PURPOSE:To efficiently absorb and relieve the deformative force due to thermal expansion, etc., by inclining the straight line connecting the top of a wave and the intermediate point between the two wave valleys to the perpendicular to the traveling direction of the wave at a specified angle and specifying the pitch, wave height and length of a flat part. CONSTITUTION:The straight line connecting the top of the wave and the intermediate point between the two wave valleys is inclined to the perpendicular to the traveling direction of the wave at an angle of alpha. An inclined wave form strip made of a thin metallic sheet having pitch P1 and wave height H1 is superposed on a trapezoidal-wave strip made of a thin metallic sheet having length L of the flat part and wave height H2 to form a honeycomb constituting the exhaust gas purifier. In this case, L >=P1 and H2>H1 are satisfied. Consequently, the deformative force due to heat is effectively absorbed and relieved, the rigidity is also high, and a uniform honeycomb having a specified cell density is efficiently fabricated.

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 comprising a metallic honeycomb body for carrying an exhaust gas purifying catalyst, which is interposed in the middle of an exhaust pipe as a means for purifying exhaust gas of an automobile. Regarding More specifically, the present invention relates to an exhaust gas purifying apparatus of this type used under severe conditions, which is a metallic honeycomb body having improved durability against deformation and damage due to thermal expansion and thermal stress. Is.

[0002]

2. Description of the Related Art Conventionally, in this type of exhaust gas purifying apparatus, a flat strip member made of a heat-resistant thin steel plate and a corrugated plate member formed by corrugating the thin steel plate are generally contacted with each other at their abutting portions. A large number of mesh vent holes for the exhaust gas passages (hereinafter, also referred to as cells And a tubular metal case having both ends opened for filling and fixing the honeycomb body. The honeycomb body and the metal case can withstand thermal expansion and thermal stress due to the high temperature of the exhaust gas itself and the exothermic reaction between the exhaust gas and the purification catalyst, and can also withstand vibrations during vehicle running. It is firmly fixed by brazing or welding. Needless to say, the abutting portions of the flat band member and the corrugated plate member forming the honeycomb body are fixed by various methods.

In recent years, in view of price competition with conventional cordierite ceramic carriers, a specially made metal case for filling and firmly adhering the honeycomb body is not used, that is, metal. There is a movement to construct an exhaust gas purifying device only with a honeycomb body. In this case, since the metal case is not used, the manufacturing cost of the metal case, the filling and fixing cost of the metal case and the metal honeycomb body, the so-called canning cost, etc. are reduced, and a significant cost merit is generated. Needless to say.

However, the above-described exhaust gas purifying apparatus composed only of the honeycomb body or the exhaust gas purifying apparatus composed of the honeycomb body and the metal case cannot endure long-term use. This is not only in the axial direction of the honeycomb body (that is, inflow and passage directions of exhaust gas), but particularly in the direction perpendicular to the axial direction (hereinafter referred to as the radial direction of the honeycomb body), the exhaust gas itself. A large deformation force due to thermal expansion or thermal stress that occurs in an atmosphere of high temperature or heat generated by the catalytic reaction of unburned gas is caused by the difference in temperature gradient between the central portion and the outer peripheral portion of the honeycomb body. It is based on the tendency to propagate to the vicinity of the outer peripheral portion of the honeycomb body or the contact surface between the outer peripheral surface of the honeycomb body and the inner wall surface of the metal case through the flat plate material and the corrugated plate material. That is, in the process of propagation of the thermal deformation force, the constituent members of the honeycomb body are damaged or buckled, and further, the thermal deformation force is particularly near the outer peripheral portion of the honeycomb body or the outer peripheral surface of the honeycomb body and the metal case. Since it concentrates in the vicinity of the contact surface with the inner wall surface, the flat plate band and / or the corrugated plate band forming the honeycomb body is greatly cracked, damaged, and buckled at the site, This is due to the disadvantage that the contact part or the contact part between the honeycomb body and the metal case is peeled off or separated.

The following has been proposed as a measure for improving the durability in the radial direction due to the thermal deformation force of the honeycomb body.

(I) In JP-A-63-182038, a honeycomb body is manufactured from a first corrugated plate and a second corrugated plate having mutually different wavelengths (cycles) λ and wave heights (amplitudes) A. The technology is disclosed. That is, the first corrugated plate having a relatively large period and amplitude and the second corrugated plate having a relatively small period and amplitude are used to radially press and stretch under a thermal deformation cycle. I try to endure my strength. However, this technique is based on the premise that the first and second corrugated plates have sinusoidal curves or curves close to them, and when these substantially sinusoidal waveforms are used, a honeycomb body is manufactured by winding molding or the like. At this time, the waveform is deformed during the winding operation due to insufficient rigidity, and a cell having a predetermined cell density (standard product) cannot be manufactured, or the productivity of the honeycomb body is low in relation to the winding speed. Further, when these corrugated plates are used, the contact portions of the first and second corrugated plates do not all come into contact with each other at the peaks and peaks (valleys and valleys) or peaks and valleys (note that such contacting Needless to say, the relationship is not preferable for securing the strength of the abutting portion.) Even if the abutting portion is fixed by brazing or the like, the wave is generated under the large thermal deformation force described above. The plates will peel off from each other, and in conjunction with such peeling, various defects will be induced.

(Ii) Japanese Unexamined Patent Publication (Kokai) No. 64-30651 discloses a flat plate in which a concave curved surface portion that comes into surface contact with the convex curved surface portions (wave peaks and troughs) of the corrugated sheet is formed. It can be said that a corrugated sheet of a seed) and a corrugated sheet are used to manufacture a honeycomb body. This directly improves the bonding strength and saves the amount of expensive γ-alumina used during washcoating by directly contacting both plates with their convex / concave curved surfaces (internal / external contact). It is a thing. However, since the flat plate has a corrugated shape, the corrugated portion can reduce the thermal deformation force in the radial direction. However, since this technique also uses a corrugated plate having a sinusoidal curve, it has the above-mentioned drawbacks due to insufficient rigidity when manufacturing a honeycomb body, and the flat plate and the corrugated plate contact surface are in surface contact with each other. It has a drawback that the absorption / relaxation property of the deformation force is reduced.

(Iii) Japanese Utility Model Laid-Open No. 2-150032 discloses a metal catalyst carrier having a structure in which a small wave plate having a large number of small waves and a flat wave plate having a flat top are alternately stacked. It is shown that two or more small waves of the flat plate are in contact with the flat head of the flat-headed corrugated plate. This invention aims at preventing the film-out phenomenon (scoping) in the axial direction of the honeycomb body, but the small wave shape of the small wave plate is a sine wave and the pitch width (one wavelength) is small. For this reason, it is difficult to manufacture the small wave plate itself, the corrugation is stretched out when manufacturing the honeycomb body, or the back pressure is generated by clogging in the small wave space during brazing or catalyst coating. There are various problems such as increasing

[0009]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As described above, in the exhaust gas purifying gas apparatus of this kind, in order to sufficiently withstand the thermal deformation force of the honeycomb body,
Amend the idea that it is only necessary to firmly bond between the flat plate-shaped band material and the corrugated plate-shaped band material forming the honeycomb body, or between the outer peripheral surface of the honeycomb body and the inner wall surface of the metal case. It is a thing. The present inventor has conducted extensive studies in order to solve the above-mentioned drawbacks of the conventional exhaust gas purification device. As a result, instead of the conventional members (flat plate and corrugated band) that form the honeycomb body, the flat plate has a relatively small substantially sinusoidal wave and is perpendicular to the traveling direction of the wave. A corrugated strip having a desired inclination angle (α) with respect to a line (hereinafter referred to as an inclined corrugated strip), and a corrugated strip having a trapezoidal wave with a relatively large wave height. (Hereinafter, referred to as a trapezoidal wave band material.) In addition to the process advantage that a homogeneous honeycomb body having a predetermined cell density can be efficiently manufactured, thermal expansion transmitted in the radial direction of the honeycomb body and The inventors have found that a large deforming force based on thermal stress can be efficiently absorbed and relaxed, and have completed the present invention.

[0010]

The present invention will be summarized as follows.
According to the present invention, the straight line connecting the apex of the wave and the midpoint of the two troughs of the wave has a desired inclination angle (α) with respect to the line perpendicular to the emerging direction of the wave, and the pitch width P ₁ and the wave height H The slanted corrugated strip made of a thin metal plate having a corrugation of _{1 and} the trapezoidal corrugated strip having a trapezoidal wave having a flat portion length L and a wave height H ₂ made of a thin metal plate are brought into contact with each other to be overlapped. In an exhaust gas purifying apparatus comprising a honeycomb body for supporting an exhaust gas purifying catalyst having a large number of mesh-shaped vent holes in the axial direction manufactured by stacking, the inclined wave band member and the trapezoidal wave band member are ( i) L ≧ P ₁ (ii) The present invention relates to an exhaust gas purifying device which satisfies the condition of H ₂ > H ₁ .

The structure of the present invention will be described in detail below. In the present invention, the rectangular wave and the trapezoidal wave are those in which the cross-sectional shape of the wave is formed by connecting the rectangular cross-sectional shape and the trapezoidal cross-sectional shape. In an exhaust gas purification device that uses a metallic honeycomb body, thermal expansion and thermal stress (strain)
It is extremely important to have sufficient durability against the deformation force based on. In other words, this type of exhaust gas purifying device made of metal has the heating and
The problem of durability against heat is a very important issue because it is exposed to a harsh thermal environment during traveling as well as the thermal alternating load of the cooling cycle.

Considering the situation during running, in the exhaust gas purifying apparatus, the exhaust gas purifying apparatus has a different exhaust gas flow rate distribution (a different flow rate between the central portion and the peripheral portion) and Pt carried on the surface portion of the honeycomb body. , Pd, Rh, etc., the catalytic reaction (exothermic reaction) between the exhaust gas purifying catalyst and the exhaust gas exposes the central portion of the honeycomb body to a higher temperature than the peripheral portion. By the way, the temperature inside this type of exhaust gas purifier is generally 700-800 ℃.
However, if a large amount of HC (hydrocarbon) is emitted,
It can reach around 1200 ℃.

When the temperature gradient inside the honeycomb body is examined in more detail, the temperature gradient between the outer peripheral portion of the honeycomb body and a portion slightly inside thereof is significantly larger than the temperature gradient in the vicinity of the central portion. This is further promoted because the outer peripheral surface of the honeycomb body is in direct contact with the outside air, or the honeycomb body is fixed in the cylindrical metal case in contact with the outside air, rainwater and the like.

Therefore, in an exhaust gas purifying apparatus (of a type that does not use a metal case) consisting only of a honeycomb body, or an exhaust gas purifying apparatus composed of a honeycomb body and a metal case, from the center of the high temperature side of the honeycomb body. A strong deforming force (hereinafter also referred to as a deforming force due to heat) due to thermal expansion and thermal stress is propagated to the vicinity of the outer peripheral surface of the honeycomb body on the low temperature side, that is, with the heat transfer in the radial direction of the honeycomb body. You will concentrate on the part. The large deformation force due to heat in the radial direction of the honeycomb body causes the honeycomb structural members to buckle in the propagation process, or even when the abutting portions between the structural members are firmly fixed, separation occurs with time. Raise it, or even crack or damage each component. In particular, this effect is great in the vicinity of the outer peripheral surface of the honeycomb body where the thermal deformation force is concentrated. Then, in conjunction with the peeling, cracking, and breakage, the expensive catalyst layer carried on the surface of each component is also peeled off, resulting in a reduction in exhaust gas purification ability. Further, the above-mentioned situation is the same in an exhaust gas purifying apparatus in which the honeycomb body is filled in the metal case and the outermost peripheral surface of the honeycomb body is firmly fixed to the inner wall surface of the metal case.
In this case, the large thermal deformation force breaks the adhered state between the outer peripheral surface of the honeycomb body and the inner peripheral surface of the metal case, and induces the separated state.

Therefore, in order to eliminate or suppress the above-mentioned defects such as peeling, in the structure of the honeycomb body, a means for effectively absorbing and relaxing the deformation force due to thermal expansion and thermal stress in the radial direction of the honeycomb body. Is essential.

From the above viewpoints, in the present invention, the following members are used as the constituent members of the metallic honeycomb body. (i) Inclined corrugated strip with a relatively small wave height Instead of the conventional flat strip, the straight line connecting the apex of the wave and the midpoint of the two valleys on the left and right of the apex is perpendicular to the traveling direction of the wave. A strip material made of a thin metal plate having a desired inclination angle (α) with respect to the line and having a substantially sine wave having a pitch width P ₁ and a wave height H ₁ is used. (ii) Trapezoidal wave strip with trapezoidal wave Instead of conventional corrugated plate strip with sinusoidal waveform, use thin metal strip with trapezoidal wave with flat portion length L and wave height H _2. To do. Generally, as a honeycomb body of this type, for example, when manufacturing a honeycomb body having a cell density of 400 cells per square inch (400 cpsi), P ₁ is 0.5 to 1.5 mm, and H is H depending on the plate thickness of the strip. 0.2 to 0.5mm as ₁
Slanted corrugated strip material, L as 0.5-1.5 mm, H ₂ as 1.0
Trapezoidal corrugated strips of ~ 1.5 mm are used.

In the present invention, the inclined corrugated strip material is, for example, chromium steel (chrome 13 to 25%), Fe-Cr20.
% -Al 5% or other heat-resistant stainless steel, or heat-resistant stainless steel with rare earth added to improve the oxidation resistance of such flat steel strip with a thickness of 0.02 mm to 0.1 mm. The one with the corrugation so that it has an inclined sine wave is used, and the one with the trapezoidal wave is also used as the trapezoidal wave band material by passing the flat plate-shaped band material between the forming gears. To be done. When stainless steel containing Al is used for each strip, the heat and oxidation resistance is improved. Also, heat treatment causes Al ₂ O ₃ of various shapes such as whiskers or mushrooms to break out on the surface of the strip, which purifies exhaust gas. This is preferable because it firmly fixes the wash coat for supporting the catalyst for use.

In the present invention, the respective strips (the slanted corrugated strip and the trapezoidal strip) are used for the following reasons. That is, an inclined corrugated strip having a relatively small substantially sine wave and each waveform having a desired inclination angle (α) with respect to a vertical line with respect to the traveling direction of the wave has a honeycomb shape due to the small corrugation. It is possible to effectively absorb and mitigate the thermal deformation force of the body in the radial direction. In particular, in the case of an inclined corrugated strip, one having no inclination angle (α) because each corrugation has a desired inclination angle (α) with respect to a vertical line perpendicular to the wave traveling direction (ie, The thermal stress absorption / relaxation property is remarkably superior to that of the vertical line). This is because when a slanted corrugated strip and a trapezoidal corrugated strip are stacked to form a honeycomb body, the slanted corrugated strip interposed between the trapezoidal corrugated strips is inclined when a strong thermal stress is applied. This is because the corrugated portion itself can flexibly deform to absorb thermal stress. On the other hand, a material having no inclination angle is inferior in thermal stress absorption / relaxation characteristics because it has a more rigid structure than the former. Although the above-mentioned inclination angle may be any desired angle, it is preferably 5 to 30 ° from the viewpoint of the ease of manufacturing the strip itself and the effect. On the other hand, the trapezoidal corrugated strip having a relatively large wave height replaces the conventional corrugated plate strip having a large sinusoidal waveform, and when the honeycomb body is manufactured, the corrugation is not deformed into a predetermined cell shape. And cell density,
In addition, it is possible to securely and firmly join the contact portion with the inclined corrugated band material having the inclined small substantially sinusoidal waveform (microcorrugation).

In the present invention, in order to bring out the full effect under each of the above-mentioned strips, each strip preferably satisfies the following conditions. In the inclined corrugated strip and the trapezoidal corrugated strip, it is preferable that the conditions of L ≧ P ₁ and H ₂ > H ₁ are satisfied. That is, it is preferable that at least one slanted corrugated strip is in contact with the flat portion of the trapezoidal corrugated strip. Under this condition, 3P ₁ ≧ L ≧ P ₁ or 2P ₁ ≧ L
The condition of ≧ P ₁ may be set. Hereinafter, these conditions will be described with reference to the drawings.

[0020] Figure 1 illustrates a pitch width P _1, the gradient waveform strip B ₁ described above the wave height H _1, the length of the flat portion L, and the state in which the trapezoidal wave strip B ₂ was Juseki wave height H ₂ It is a thing. In FIG. 1, the inclined corrugated strip B ₁ is in a state in which two pitches are in contact with each other in the flat portion (B ₂₁ ) of the trapezoidal corrugated strip B _{2 having} the length L, that is, L = 2P _1. Has been done. In addition, in FIG. 1, it is shown that the length of one pitch of the trapezoidal corrugated strip B ₂ is P ₂ , and the P ₂ is a slanted corrugated strip B.
It is also shown that the relationship of ₁ for 1 pitch length P ₁ is 5P ₁ = P ₂ . FIG. 2 is a diagram for explaining the corrugated shape of the inclined corrugated strip B ₁ used in the present invention. This will be described by focusing on one waveform of the band B ₁ in FIG. Wave crest (b) and two troughs (a, c) located to the left and right of the crest (b)
It is important that the straight line connecting the midpoints (d) of has a tilt angle (α) with respect to the line perpendicular to the traveling direction (e) of the wave. Due to this inclination angle (α), the inclined corrugated band material can effectively absorb the thermal stress in the radial direction of the honeycomb body by flexibly deforming the corrugation.
In this type of honeycomb body, how many pitches of the slanted corrugated strips B ₁ are brought into contact with the flat portions B ₂₁ of the trapezoidal corrugated strips B ₂ is extremely important. In consideration of the overall rigidity of the honeycomb body and the absorption and relaxation characteristics of thermal stress, B ₁
As the pitch width P ₁ of B ₁ and B ₂ is reduced, the space S formed by the contact portions of B ₁ and B ₂ becomes smaller,
This is because when the brazing of B ₁ and B ₂ is performed, there are adverse effects such as clogging by the brazing material and an increase in exhaust gas back pressure. In this respect, the contact relationship between both strips B ₁ and B ₂ will be considered below. 3, the flat portion B21 trapezoidal strip B ₂ (length L)
In one period length P ₁ of the gradient waveform strip B ₁ is shown abuts state. That is, the relationship of L <P ₁ is shown. FIG. 4 shows the relationship of L <P ₁ . In such a state, the number of corrugations provided in B ₁ is relatively smaller than that in FIGS. 1 and 3, so that the effect of absorbing / releasing thermal stress is reduced, and both bands are reduced. Material B
_Since the cross-sectional shape of the space S formed by the abutting portions of ₁ and B ₂ is easily deformed by the winding force applied during the manufacturing of the honeycomb body, a honeycomb body having a uniform cell shape can be manufactured. The drawbacks such as disappearance become large. Therefore, there is a problem of clogging in the space S formed by the abutting portion of both strips B ₁ and B _{2 and} an increase in the back pressure of the exhaust gas, and further the activity of the catalyst carried in the space S ( Deactivation of the catalyst due to clogging),
In consideration of the above, it is necessary to obtain an appropriate combination condition of both strips B ₁ and B ₂ .

[0021] In view of the above, in the present invention, the pitch width P ₁ and trapezoidal wave strip flat portion B ₂₁ of the inclined waveform strip B ₁
The relationship of the length L of is generally set to L ≧ P ₁ . Under this condition, for example, 3P ₁ ≧ L ≧ P ₁ , or 2P ₁ ≧
Conditions such as L ≧ P ₁ are set. Regarding the wave height (amplitude) of both strips, H ₂ > H _{1 in} consideration of the cell density of the honeycomb body, the increase in back pressure, the ease of manufacturing the strip itself, and the like.
The condition of 1 / 2H ₂ ≧ H ₁ ≧ 1 / 10H ₂ should be satisfied.

The metal honeycomb of the present invention is manufactured by using the above-mentioned slanted corrugated strip having the pitch width P ₁ and the wave height H ₁ and the trapezoidal corrugated strip having the flat portion length L and the wave height H _2. 5 and 6, for example, and is manufactured by a normal method. That is, the honeycomb body (1) is
As shown in FIG. 5, a slanted corrugated strip (B ₁ ) having a thickness of 0.03 to 0.1 mm and a trapezoidal corrugated strip (B ₂ ) made of a heat-resistant thin steel plate satisfying the above-mentioned conditions are mutually It is manufactured by stacking so as to have an abutting portion and then winding and laminating both in a spiral shape. Due to this winding lamination, a large number of mesh-like ventilation passages (cells) that become exhaust gas passages
(C) is formed automatically. Also, the honeycomb body (1)
As shown in FIG. 6, the slanted corrugated strip (B ₁ ) and the trapezoidal corrugated strip (B ₂ ) are stacked so as to be in contact with each other, and are laminated and formed in a layered manner. Good.

In the present invention, as long as both ends of the metal case (2) for filling and fixing the honeycomb body (1) inside are open, the shape thereof is not limited. .. 5 to 6 show a cross-section having a circular shape and a cross-section having a racetrack shape (an oval shape), but the present invention is not limited to this. For example, in order to fit the space under the vehicle body, the exhaust gas purifying device may be configured using a metal case having a substantially triangular cross section. As the material of the metal case, the same kind of heat-resistant steel as the honeycomb body may be used, or a material having high heat-corrosion resistance may be used. In addition, a double structure with the outer part of the metal material having higher heat resistance and corrosion resistance than the inner part, specifically, a clad steel that uses fulrite stainless steel for the inner part and austenitic stainless steel for the outer part is used. May be.

[0024]

The present invention will be described in more detail based on the following examples, but the present invention is not limited to the examples. (i) Manufacture of inclined corrugated strip / trapezoidal corrugated strip Fe-Cr 20% -Al 5% -Ce 0.02% heat-resistant steel thickness
A flat strip made of a thin steel strip having a width of 0.04 mm and a width of 74.5 mm was passed between the forming gears to prepare an inclined corrugated strip (B ₁ ) and a trapezoidal corrugated strip (B ₂ ). That, 0.9 mm pitch width (P ₁₎ of the gradient waveform strips (B _1), wave height and (H ₁₎
0.3mm and the angle of inclination α is approximately 20 °, whereas, pitch (P ₂₎ to 2.4mm trapezoidal wave band material (B _2), 1.0 mm in length of the flat portion (L), height (H _2, ) Was set to 1.3 mm. (ii) Manufacture of honeycomb body Next, the slanted corrugated strip (B ₁ ) and the trapezoidal corrugated strip (B ₂ ) are stacked on each other as shown in FIG. A honeycomb body with an outer diameter of 70 mm having a large number of mesh-like ventilation passages (cell density 300 cpsi) in the axial direction was manufactured. When the honeycomb body was manufactured by the winding operation, the trapezoidal shape of the trapezoidal wave band material did not lose its shape, and it was possible to efficiently wind and laminate the trapezoidal band material having a predetermined cell density. Next, the honeycomb body is heat-resistant steel with an inner diameter of about 70 mm (JIS G4312 SUH310S)
It is filled in a metal case made of metal, and both ends of the honeycomb body and its vicinity (area 10 mm from the end) are immersed in a slurry of nickel-based brazing material, dried and then heat-treated in a vacuum furnace to form the honeycomb body and the metal. The case was fixed by brazing. next,
The catalyst supporting layer was formed in the exhaust gas purifying apparatus manufactured as described above as follows. That is, activated alumina (γ-Al ₂ O ₃ ) is formed on the surface of each strip constituting the honeycomb body.
A slurry prepared by mixing powder and alumina sol was applied and heat-treated at 600 ° C. to form a catalyst supporting layer. (Performance evaluation) The exhaust gas purifying apparatus having the catalyst-supporting layer was subjected to a rapid thermal quenching test (burners poling test) at room temperature to 900 ° C for 100 cycles, and a vibration test. No buckling, cracking, or breakage was observed in any of the parts, and no peeling or detachment of the contact part was observed. Furthermore, neither fall of the catalyst supporting layer nor peeling was observed.

[0025]

In the exhaust gas purifying apparatus of the present invention, the honeycomb body portion that is exposed to particularly severe thermal conditions has, as its constituent member, a sloped corrugated band having a specific pitch width, a wave height, and a waveform of a specific shape. It is manufactured by using a material and a trapezoidal corrugated material having a specific flat length and wave height. As a result, the honeycomb body of the present invention exerts the deformation force due to heat, particularly the deformation force due to large heat applied in the radial direction of the honeycomb body under the joint work of the inclined corrugated strip and the trapezoidal corrugated strip. Can be absorbed and alleviated. This uses an inclined corrugated strip having a specific corrugated structure for inclining a microcorrugation (small corrugation) as a constituent member of the honeycomb body, and a trapezoidal corrugated strip having a specific relationship with the inclined corrugated strip. This is because it is possible to greatly improve the followability to thermal expansion and contraction by using it, so that the buckling, cracking and damage of the constituent members of the honeycomb body and the separation of the abutting portion between the members are effective. Can be prevented. Further, in the present invention, since the abutting portions of the slanted corrugated strip and the trapezoidal corrugated strip that constitute the honeycomb body are firmly bonded, the honeycomb body is excellent in vibration resistance and durability. Further, in connection with the above-mentioned effects, the catalyst supporting layer for supporting the exhaust gas purifying catalyst formed on the wall surface of the honeycomb body is effectively prevented from falling and peeling.
In addition, in the present invention, when a honeycomb body is manufactured, a strip material having a trapezoidal corrugation is used instead of a conventional corrugated plate having a sinusoidal corrugation as a constituent member, and therefore, when manufacturing a honeycomb body, Since the rigidity is higher than that of the sine wave-shaped corrugated plate, the cell shape is not crushed, and a uniform honeycomb body having a predetermined cell density can be efficiently manufactured.

[Brief description of drawings]

FIG. 1 is a diagram showing a first contact relationship between a slanted corrugated strip B ₁ and a trapezoidal corrugated strip B ₂ .

FIG. 2 is a diagram showing a waveform shape of a sloped corrugated strip B ₁ .

FIG. 3 is a diagram showing a second contact relationship between the inclined corrugated strip B ₁ and the trapezoidal corrugated strip B ₂ .

FIG. 4 is a diagram showing a third contact relationship between the inclined corrugated strip B ₁ and the trapezoidal corrugated strip B ₂ .

FIG. 5 is a perspective view of an exhaust gas purifying apparatus manufactured by fixing the honeycomb body of the present invention in a cylindrical metal case.

[Fig. 6] Fig. 6 is a perspective view of an exhaust gas purifying apparatus manufactured by fixing the honeycomb body of the present invention to a metal case having a racetrack cross section.

[Explanation of symbols]

1 ... ・ Honeycomb body B ₁・ ・ ・ Inclined corrugated strip B ₂・ ・ ・ ・ Trapezoid corrugated strip C ・ ・ ・ Reticulated vent holes (cells) 2 ・ ・ ・Metal case

Claims (10)

[Claims] 1. A straight line connecting a peak of a wave and a midpoint between two troughs of the wave has a desired inclination angle (α) with respect to a line perpendicular to the traveling direction of the wave, and has a pitch width P ₁ and a wave height. A slanted corrugated strip made of a thin metal plate having a corrugation of H ₁ and a trapezoidal corrugated strip having a trapezoidal wave having a flat portion length L and a wave height H ₂ made of a thin metal plate are brought into contact with each other. In an exhaust gas purifying apparatus comprising a honeycomb body for supporting an exhaust gas purifying catalyst having a number of mesh-shaped vent holes formed in a stack, the inclined corrugated band member and the trapezoidal corrugated band member, (i) L ≧ P ₁ (ii) An exhaust gas purifying device which satisfies the condition of H ₂ > H ₁ . 2. The exhaust gas purifying apparatus according to claim 1, wherein the inclination angle (α) is 5 to 30 °. 3. The inclined corrugated strip and the trapezoidal corrugated strip are 3P ₂ ≧
The exhaust gas purifying apparatus according to claim ₁ , which satisfies the conditions of L ≧ P ₁ and H ₂ > H ₁ . 4. The inclined corrugated strip and the trapezoidal corrugated strip are 2P ₂ ≧
The exhaust gas purifying apparatus according to claim ₁ , which satisfies the conditions of L ≧ P ₁ and H ₂ > H ₁ . 5. The exhaust gas purifying apparatus according to claim 1, wherein H ₁ is 1/2 to 1/10 of H ₂ . 6. The honeycomb body is manufactured by stacking a slanted corrugated strip and a trapezoidal corrugated strip so that they are in contact with each other, and winding and stacking them in a spiral shape. Exhaust gas purifier according to. 7. The exhaust gas purifying apparatus according to claim 1, wherein the honeycomb body is manufactured by stacking inclined corrugated strips and trapezoidal corrugated strips in a layered manner so as to be in contact with each other. 8. The exhaust gas purifying apparatus according to claim 1, wherein the honeycomb body is fixed in a metal case. 9. The exhaust gas purifying apparatus according to claim 8, wherein the metal case has a circular cross section. 10. The exhaust gas purifying apparatus according to claim 8, wherein the metal case has a racetrack cross section.