JP3193426B2 - Exhaust gas purification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a main component of a catalyst supporting base for supporting an exhaust gas purifying catalyst, which is generally provided in the middle of an exhaust pipe as means for purifying exhaust gas of an automobile. The present invention relates to an exhaust gas purification device. More specifically, the present invention can significantly improve a major drawback of an exhaust gas purifying apparatus using such a catalyst-carrying matrix, that is, a problem of a low exhaust gas purification rate at the time of engine start (cold start). The present invention relates to an exhaust gas purifying device incorporating a heating means capable of being used.

[0002]

2. Description of the Related Art Heretofore, as a catalyst supporting base which is a main component of this type of exhaust gas purifying apparatus, there are a ceramic monolith type using a ceramic material such as cordierite and a metal monolith type. Monolith type is known. Particularly in recent years, metal monolith type devices have been actively researched and developed in terms of mechanical strength, durability, air flow resistance, purification efficiency (miniaturization of the device) and the like. In the following description, the latter metal monolith type is mainly described for convenience of description. In general, a metal monolith type exhaust gas purifying apparatus stacks a flat strip made of a heat-resistant thin steel sheet and a corrugated strip formed by corrugating the thin steel sheet so as to have an abutting portion. A plurality of mesh-shaped vent passages (hereinafter also referred to as cells) for exhaust gas passages in the axial direction, which are formed by spirally winding and laminating them in a lump or by laminating them in a layered manner. The honeycomb structure includes a honeycomb-shaped laminate (hereinafter, referred to as a honeycomb body) and a cylindrical metal case having both ends opened for loading and fixing the honeycomb body.

[0003] The honeycomb body and the metal case are designed to withstand thermal expansion and thermal stress generated under a high temperature of the exhaust gas itself and a high temperature atmosphere due to an exothermic reaction between the exhaust gas and the purification catalyst. In addition, it is firmly fixed by brazing or welding so as to withstand severe vibrations when the automobile is running. It goes without saying that the contact portions between the flat band material and the corrugated band material constituting the honeycomb body are fixed by various methods.

A major problem in this type of exhaust gas purifying apparatus is as follows. That is, at the time of starting the engine (at the time of cold start), the optimum temperature at which the exhaust gas purifying catalyst such as Pt, Pd, and Rh supported on the wall surface of the metallic honeycomb body causes an efficient contact reaction with the exhaust gas. The condition is not reached, and most of the harmful substances such as CO (carbon monoxide) and HC (hydrocarbon compounds) emitted from the engine are released to the atmosphere without being purified. .

Various proposals have been made to solve the problems at the time of starting the engine (at the time of cold start). For example, (i) in Japanese Utility Model Laid-Open No. 63-67609,
In a converter using a ceramic monolith type as the main catalyst, a metal carrier manufactured in advance in a honeycomb shape is coated with alumina on a portion adjacent to the exhaust gas upstream side of the main catalyst, and a metal monolith catalyst which can be energized is used. (Ii) Japanese Utility Model Laid-Open No. 2-94316 discloses a method in which a far-infrared heater is provided on the outer peripheral portion of the catalyst body. (Iii) Japanese Utility Model Application Laid-Open No. 3-10022 discloses a front face of a monolith type catalyst. Heater (upstream of exhaust gas)
Further, a method has been proposed in which a rectifying plate for rectifying exhaust gas is disposed in front of the heater. However, in these conventional proposals, in view of the demand that the temperature of the honeycomb body performing the heater function must be raised sufficiently high to efficiently perform the catalytic reaction, the temperature rise temperature is insufficient, They are not fully satisfactory, forcing them to raise costs for a solution.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional honeycomb body. The present inventors have made various studies on a technique for sufficiently and rapidly raising the temperature of the honeycomb body, particularly the entire inside of the honeycomb body, to a high temperature at the time of a cold start. In particular, in an energizing and heating type exhaust gas purifying apparatus of the type proposed in Japanese Utility Model Application Laid-Open No. 63-67609 described in the prior art, a honeycomb body having a pre-heater function disposed in front of a main catalyst supporting base body. We have studied diligently about the improvement of.

As a result, the present inventors have found that (i) Japanese Utility Model Application Laid-Open No. 63-67609 described as the prior art.
No., etc., a honeycomb body is manufactured by stacking a heat-resistant thin metal plate flat band material and a corrugated band material in advance so as to be in contact with each other, and then alumina is added thereto. In the case of a preheater obtained by performing a coating process (it is recognized that the coating with alumina in the above-described conventional technique is for supporting a catalyst for purifying exhaust gas on a formed coating layer). ii) (a) A plurality of honeycomb bodies (H1 to Hn) having a desired width (thickness in the axial direction) are formed by using a heat-resistant, thin metal sheet flat band and a corrugated band. (B) arranging an electrode material (B) at the center of each honeycomb body, and (c) arranging each honeycomb body at a desired interval, and providing a longest current supply path to an external power supply section. To form a honeycomb body (H) having a heater function. In this case, it was found that the amount of heat generated by resistance heating increased due to the increase in resistance when energized, and that this was extremely effective for exhaust gas purification at the time of engine start (cold start). Reached.

That is, in the case of the above (i), since the flat band member made of a thin metal plate and the corrugated band member constituting the honeycomb body are in contact with each other, for example, the center portion and the outer peripheral portion of the honeycomb body are in contact with each other. In a wound type cylindrical honeycomb body having electrode terminals, electricity flows easily from the center of the honeycomb body to the center portion of the honeycomb body through a shortest distance in a radial direction through energization (the resistance as a heater). Small value)
Insufficient resistance heating cannot be obtained, whereas in the case of (ii), electricity flows in the radial direction from the center of the honeycomb body, but it is sufficient because the honeycomb body is constituted by a plurality of honeycomb bodies. Sufficient resistance heating can be obtained because a long current path can be taken, whereby the honeycomb body is heated to a sufficiently high temperature, and the electrode material (B) is disposed at the center of each honeycomb body. Therefore, the inside of each honeycomb body is uniformly heated, and furthermore, the exhaust gas is preheated more uniformly because the exhaust gas is turbulent in the gaps between the honeycomb bodies, thereby purifying the exhaust gas. Was found to be extremely effective. An object of the present invention is to provide an energized heat generation type exhaust gas purifying apparatus having excellent heater characteristics based on the above findings.

[0009]

SUMMARY OF THE INVENTION In summary of the present invention,
According to the present invention, a plurality of honeycomb bodies (first honeycomb body H1 to n-th honeycomb body H) are provided upstream of an exhaust gas flow in a metal case.
n) An exhaust gas purifying device (A) for purifying exhaust gas comprising a honeycomb body (H) having a heater function and a main catalyst supporting base (M) disposed downstream.
In the above, each of the honeycomb bodies (H1 to Hn) constituting the honeycomb body (H) having the heater function is composed of (i) a heat-resistant, thin metal plate-shaped flat strip and a corrugated strip. It is manufactured by stacking so as to be in contact with each other, and has an electrode material (B) at the center thereof, (ii) arranged at a desired interval, and (iii) an external power source. The exhaust gas purifying apparatus is characterized in that the parts are connected to each other so as to take the longest energizing path to the part.

Hereinafter, a technical configuration and an embodiment of the present invention will be described with reference to the drawings. It goes without saying that the present invention is not limited to the illustrated one.

FIG. 1 is a perspective view of an exhaust gas purifying apparatus (A) according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view in which a part of the exhaust gas purifying apparatus (A) of the first embodiment of the present invention shown in FIG. 1 is omitted. As shown in FIGS. 1-2,
An exhaust gas purifying apparatus (A) of the present invention contains a honeycomb body (H) having a heater function, a main catalyst supporting base (M), and the honeycomb body (H) and the main catalyst supporting base (M), and is fixed. And a metal case (C). Further, in the exhaust gas purifying apparatus (A) of the present invention, the honeycomb body (H) having the heater function for energizing and generating heat in the honeycomb body (H) having the heater function includes a power supply unit ( 6) Connected to. In the exhaust gas purifying apparatus (A) according to the present invention, the honeycomb body (H) having a heater function and the main catalyst supporting base (M) form an exhaust gas flow (F).
In contrast to (see FIG. 2), a honeycomb body (H) having a heater function on the upstream side and a main catalyst supporting base (M) on the downstream side are disposed and fixed in a metal case (C).

First, the configuration of the honeycomb body (H) having a heater function of the present invention will be described. As shown in FIG. 2, the honeycomb body (H) having a heater function according to the present invention includes a plurality of honeycomb bodies (H1 to Hn) having a desired width (L).
(In the case of FIG. 2, an example in which n = 3 is shown, but the present invention is not limited to this.) And is arranged at a desired interval (D). Each of the honeycomb bodies (H1 to Hn)
The width (L) and the distance (D) between the honeycomb bodies may be determined as appropriate, but from the viewpoint of the effect and the easiness of the manufacturing surface, it is preferable that L is 5 to 100 mm and D is 1 to 100 mm. . An electrode material (B = B1 to Bn) is disposed at the center of each honeycomb body (H1 to Hn) in the axial direction of each honeycomb body.

In the present invention, each of the honeycomb bodies (H1 to H
The structure of n) may be arbitrary, and FIG. 1 shows a wound type honeycomb body (H1). This type of wound type honeycomb body (H1) is formed by laminating a heat-resistant, thin metal plate-shaped flat strip (1) and a corrugated strip (2) so as to abut each other. It is manufactured by winding and laminating in a spiral. By this winding, a large number of mesh-shaped vent passages (cells) (3) serving as exhaust gas passages are automatically formed.

In the present invention, each of the honeycomb bodies (H1 to Hn) constituting the honeycomb body (H) having a heater function.
Is not limited to the above-mentioned wound type, but may be a layered type manufactured by stacking materials of the above-mentioned combination in a layered manner so as to abut each other. Further, as a modified example of the winding type, a large cavity may be formed in the center after the winding molding, and the cavity may be crushed to form a race track-shaped honeycomb body in cross section.
Further, when focusing on a material in which the above-mentioned materials of the combination are in contact with each other (hereinafter, referred to as a purifying element),
Each purifying element may be a radial honeycomb body having a structure arranged radially from a center point of the honeycomb body, or each purifying element may be an S-shaped honeycomb body having a structure in which the purifying elements are bent into a substantially S-shaped curve. You may. The honeycomb bodies having these various structures are the same as the main catalyst supporting base (M) made of metal, and the specific manufacturing method thereof will be described in the description of the main catalyst supporting base (M).

In the present invention, as the flat band material (1), a band material used for producing a main body supporting a main catalyst of a usual metal monolith type, for example, chromium steel (chromium 13 to 13) is used.
25%), heat-resistant stainless steel such as Fe-Cr 20% -Al 5%, or heat-resistant stainless steel with rare earth added to improve oxidation resistance.
Use a 0.1 mm strip. Further, as the corrugated sheet material (2), a corrugated sheet material having a predetermined substantially sine wave or trapezoidal wave from the flat sheet material (1) is used. In addition, considering the electrical conductivity of the honeycomb body under high temperature, Ni-
Cr alloy, Ni-Cr-Fe alloy, Ni-Cr-Al-
An Fe alloy or the like is also used. In the present invention, electrode materials (B1 to Bn) are disposed in the axial direction at the center of each honeycomb body (H1 to Hn). Such an electrode material (B1
To Bn) are the above-mentioned honeycomb bodies (H1 to Hn).
A material having a desired shape is used in accordance with the structure of (1).
For example, as an electrode material (B1 to Bn), a nickel wire,
A bar or a plate is used.

Next, the wiring relationship between the honeycomb body (H) having the heater function and the external power supply section (6) (that is, the state of the energized connection), that is, the honeycomb bodies (H1 to Hn) are provided outside. The wiring relationship with the power supply unit (6) will be described in detail. The present invention provides a plurality of honeycomb bodies (H1
To Hn) and the external power supply (6),
The wiring is performed so that a resistance value sufficient to raise the temperature of the honeycomb body is secured, that is, a longest current supply path is secured.

FIG. 2 shows one embodiment of the wiring relationship between the plurality of honeycomb bodies (H1 to Hn) and the external power supply section (6). In FIG. 2, (4) and (5) are lead wires,
(6) indicates an external power supply unit (battery). Although not shown, an electrode material (B1 to Bn) (hereinafter simply referred to as a central electrode material B1) disposed at a central portion from an external power supply section (6).
To Bn. The power supply to the honeycomb body may be performed for a limited time by a timer, or the temperature of the honeycomb body or the exhaust gas temperature may be measured by a sensor (such as a thermocouple) attached to a desired portion of the honeycomb body. It may be turned on and off by a threshold value, and the mode is not limited at all.

As shown, the (+) pole of the external power supply (6) is connected to the electrode material (B1) disposed at the center of the first honeycomb body (H1) via the lead wire (4). ). Since the first honeycomb body (H1) and the second honeycomb body (H2) have their respective center electrode materials (B1, B2) in contact with each other via the insulator (I1), electricity is supplied to the electrode materials (H1). B1 and B2) do not flow to the second honeycomb body (H2). In the present invention, since the longest energization path is required, in FIG. 2, the first honeycomb body (H
The outermost peripheral portion of 1) and the outermost peripheral portion of the second honeycomb body (H2) are wired by lead wires (4). Next, the second honeycomb body (H2) and the third honeycomb body (H3) are arranged such that the respective center electrode materials (B2, B3) are in contact with each other. For this reason, electricity is transmitted from the outermost peripheral portion of the second honeycomb body (H2) to the second honeycomb body (H2).
The center electrode material (B2) of the honeycomb body (H2) → the center electrode material (B3) of the third honeycomb body (H3) → the third honeycomb body (H
It flows through the outermost route of 3). Then, a lead wire (5) wired from the third honeycomb body (H3) to the external power supply section (6) is led out from the outermost peripheral portion of the third honeycomb body (H3). The electric energy supplied from the external power supply section (6) by the above-described wiring mode causes resistance heating under a large resistance value, and raises the temperature of each honeycomb body (H1 to Hn) to a sufficiently high temperature. Can be warmed.

In FIG. 2, each honeycomb body (H1
To H3) are insulated from the metal casing (C) by the insulating material layer (I) so that electricity is not leaked by the case (C). Needless to say, the portions where the lead wires (4, 5) penetrate the case (C) are insulated. Furthermore, each center electrode material (B1-B
3) is provided so as to protrude from one side surface of the honeycomb body (H1 to H3), but does not have to protrude separately. In such a case, a desired spacer or the like may be used to provide the interval (D).

Next, referring to FIG. 3, a plurality of honeycomb bodies (H
A second embodiment of the wiring relationship between 1 to H3) and the external power supply section (6) will be described. A major difference from the first wiring relationship in FIG. 2 is that the lead wire (4) connected to the (+) pole of the battery (6) is connected to the outermost peripheral portion of the first honeycomb body (H1). Is a point. Then, electricity is applied to the outermost peripheral portion of the first honeycomb body (H1) → the center electrode material (B1) of the first honeycomb body (H1) → the outermost peripheral portion of the second honeycomb body (H2) → the second honeycomb body (H2). ) Of the third honeycomb body (H3) → the center electrode material (B3) of the third honeycomb body (H3) → the (−) pole of the battery (6). .

In FIG. 3, the main catalyst supporting base (M) is omitted as compared with the first embodiment of FIG. 2, and each of the honeycomb bodies (H1 to H3) is made of metal. In that they are fixed in casings (C1 to C3) made of the same. In the second embodiment of FIG. 3, the center electrode material (B1) of the first honeycomb body (H1) is in contact with the center electrode material (B2) of the second honeycomb body via an insulator (I1). However, as a modification, the insulator (I1) may be removed. FIG. 3 shows an embodiment in which two lead wires are led out from the center electrode material (B1), but may be one. This is also true for the center electrode material (B2).

Referring to FIG. 4, a plurality of honeycomb bodies (H1 to H
A third embodiment of the wiring relationship between 4) and the external power supply unit (6) will be described. In FIG. 4, for simplicity of illustration, a metal case (C) constituting the exhaust gas purifying device (A), a main catalyst supporting base (M), and outer peripheral portions of the respective honeycomb bodies (H1 to H4) are shown. The insulating material layer (I) provided between the metal cases (C) is omitted. In the third embodiment shown in FIG. 4, the first and second honeycomb bodies (H1 and H2) and the third and fourth honeycomb bodies (H3 and H4) are formed by respective metal cases (C1 and C2). It is made conductive. Further, the second and third honeycomb bodies (H2 and H3) are brought into direct contact with the center electrode materials (B2 and B3) disposed at the central part to directly conduct. As shown in FIGS. 2 and 3, no insulator (I1 to I2) is used between the center electrode materials.

Referring to FIG. 5, a plurality of honeycomb bodies (H1 to H
The fourth embodiment shown in FIG. 5 for explaining the fourth embodiment of the wiring relationship between 4) and the external power supply section (6) will be described.
The third honeycomb body (H2 and H3) is made conductive by a common metal case (C2) of the honeycomb body. The other points are basically the same as those of the third embodiment shown in FIG. In the fourth embodiment shown in FIG. 5, electricity is supplied to the (+) pole of the battery (6) → the lead wire (4) → the metal case (C2) in contact with the outermost peripheral portion of the first honeycomb body (H1). → Outermost periphery of first honeycomb body (H1) → Center electrode material (B1) of first honeycomb body (H1) → Center electrode material (B2) of second honeycomb body → Outermost periphery of second honeycomb body (H2) Part → second and third honeycomb bodies (H2 to H
3) Metal case (C2) abutting on the outermost peripheral part → outermost peripheral part of third honeycomb body (H3) → center electrode material (B3) of third honeycomb body (H3) → center electrode of fourth honeycomb body Lumber (B
4) → the outermost peripheral portion of the fourth honeycomb body (H4) → a metal case (C4) which comes into contact with the outermost peripheral portion of the fourth honeycomb body (H4)
→ flows through the current path of the lead wire (5) → (−) pole of the battery (6). Thereby, a sufficient resistance value is secured, and electric energy can be converted into high heat energy.

The main catalyst supporting base (M), which is a main component of the exhaust gas purifying apparatus (A) of the present invention, may be a ceramic monolith type or a metal monolith type. It may be something. These may be manufactured according to a conventional method, and a manufacturing method of a metal (metal) monolith type will be described below. Each of the honeycomb bodies (H1 to Hn) constituting the honeycomb body (H) having the heater function described above may be manufactured in the following manner.

The main catalyst supporting base (M) having a circular cross section shown in FIG. 6 is a heat-resistant, flat metal strip made of a thin metal plate.
(1) and corrugated strip (2) are stacked so that they abut each other,
It is manufactured by winding and laminating this in a spiral. A large number of mesh-shaped vent holes (cells) (3) serving as exhaust gas passages are automatically formed by winding and laminating.

More specifically, it may be manufactured as follows. A flat strip made of a thin steel strip having a thickness of 0.04 mm and a width of 50 mm made of heat-resistant steel of Fe-Cr 20% -Al 5% -Ce 0.02% is passed between the forming gears to form a pitch width (1.0 mm).
A corrugated strip with a wave height (0.3 mm). Next, the flat band material and the corrugated band material are stacked one on top of the other, their ends are inserted into the slits of a slit-formed wound forming rod, and are collectively wound and laminated. Reticulated vents (cell density 3
(M) having a diameter of 70 mm and an outer diameter of 70 mm.

The main catalyst carrier (M) having a circular cross section shown in FIG. 7 is a heat-resistant, flat metal strip made of a thin metal plate.
(1) and a corrugated strip (2) are stacked and stacked so that they abut each other.

The main catalyst supporting base (M) shown in FIG. 8 having a race track (elliptical) cross section is a modified example of the winding type shown in FIG. A cavity having a large diameter is formed in the portion, and then the cavity is crushed to form a race track in cross section.

The main catalyst supporting base (M) having a circular cross section shown in FIG. 9 is a heat-resistant, flat metal strip made of a thin metal plate.
(1) is brought into contact with the corrugated strip (2) to form a purifying element (E), and a desired number of purifying elements (E) are radially extended from the fixed shaft (B) as a starting point. Things.

The main catalyst carrier (M) having a circular cross section shown in FIG. 10 is a purification element (E) in which a flat plate made of a heat-resistant thin metal plate and a corrugated plate are brought into contact with each other. age,
The purifying elements (E) are stacked in layers so that the outermost surface becomes a flat strip, and each purifying element (E) is centered on two fixed points (S1, S2) set on the upper and lower outermost surfaces. It is manufactured by bending E) in the opposite direction, that is, by bending each purification element (E) into a substantially S-shaped curve.

In order to carry a catalyst for purifying exhaust gas such as Pt, Pd, Rh or the like on the main catalyst carrying matrix (M) having various structures manufactured as described above, an ordinary method may be adopted. . For example, first, a catalyst supporting layer for supporting the catalyst on the wall surface of the main catalyst supporting base (M) having a honeycomb structure is formed. This includes activated alumina (γ-Al ₂
A slurry containing O ₃ ) powder and alumina sol may be placed on the top surface of the top and heated to 600 ° C. Next, in order to support a catalyst such as a three-way catalyst on the catalyst supporting layer formed in this manner, a catalyst component may be supported by a normal method such as impregnation.

In the present invention, the metal case (C) is for accommodating and fixing the honeycomb body (H) having the heater function and the main catalyst supporting base (M) therein. If it is, there is no restriction on its shape. For example, a metal case having a cross-sectional shape shown in FIGS. 6 to 10 or a metal case having an elliptical cross-section or a substantially triangular cross-section may be used to fit the space under the vehicle body. As the material of the metal case, heat-resistant steel of the same type as that of the main catalyst supporting base may be used, or a material having high heat-resistant corrosion resistance may be used. Further, a double-layered structure in which the metal material of the outer portion has higher heat resistance and corrosion resistance than the inner portion, specifically, a ferritic stainless steel may be used for the inner portion and an austenitic stainless steel may be used for the outer portion.

[0033]

According to the exhaust gas purifying apparatus of the present invention, a plurality of metal honeycomb bodies (H1 to Hn) having an electrode material in the center thereof are provided on the upstream side of the main catalyst supporting base in the metal case.
And a honeycomb body (H) having a heater function. The honeycomb body (H) having the heater function is connected to the external power supply unit by wiring so as to have the longest energizing path so that sufficient resistance heating is obtained. Therefore, in the present invention, each of the honeycomb bodies (H1 to Hn) constituting the honeycomb body (H) having the heater function is heated to a uniform and sufficiently high temperature, which is a particular problem in the exhaust gas treatment. Exhaust gas purification capacity at cold start can be greatly improved. Further, since the honeycomb body itself becomes a heater, it is not necessary to separately manufacture and arrange a heater material. Further, each of the honeycomb bodies (H) constituting the honeycomb body (H) having a heater function.
1 to Hn) are arranged at desired intervals, so that exhaust gas is turbulent in the space. Then, the exhaust gas flowing into the main catalyst carrier is heated to a more uniform temperature by the turbulence, so that the purification efficiency of the exhaust gas can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of an exhaust gas purification device (A) of the present invention.

FIG. 2 is a longitudinal sectional view of FIG. 1, particularly showing a first embodiment of a honeycomb body (H) having a heater function of the present invention.

FIG. 3 shows a second embodiment of the honeycomb body (H) having a heater function of the present invention.

FIG. 4 shows a third embodiment of the honeycomb body (H) having a heater function of the present invention.

FIG. 5 shows a fourth embodiment of the honeycomb body (H) having a heater function of the present invention.

FIG. 6 is a cross-sectional view of a first embodiment of the main catalyst supporting base (M) of the present invention.

FIG. 7 is a sectional view of a second embodiment of the main catalyst supporting base (M) of the present invention.

FIG. 8 is a cross-sectional view of a third embodiment of the main catalyst supporting base (M) of the present invention.

FIG. 9 is a sectional view of a fourth embodiment of the main catalyst supporting base (M) of the present invention.

FIG. 10 is a sectional view of a fifth embodiment of the main catalyst-carrying mother body (M) of the present invention.

[Explanation of symbols]

 A: Exhaust gas purifier F: Exhaust gas flow direction B, B1, B2: Electrode material C: Metal cases C1, C2: Metal cases of each honeycomb body M: Main catalyst-supporting base material 1 Flat band material 2 Corrugated band material 3 Cells (mesh-like vent holes) 4, 5 Lead wires 6 Battery

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B01J 21/00-37/36 B01D 53/86

Claims (5)

(57) [Claims] 1. A honeycomb body (H) having a heater function comprising a plurality of honeycomb bodies (first honeycomb body H1 to n-th honeycomb body Hn) upstream of an exhaust gas flow in a metal case, and In an exhaust gas purifying apparatus (A) for purifying exhaust gas having a main catalyst supporting base (M) disposed downstream, (i) each honeycomb of the honeycomb body (H) having the heater function The body (H1 to Hn) is manufactured by winding a heat-resistant, thin metal sheet-shaped flat plate and a corrugated strip into contact with each other, and winding and forming the same. Electrode material (B
= B1 to Bn), and (ii) the honeycomb bodies (H1 to Hn) of the honeycomb body (H) having the heater function are arranged at desired intervals, and (iii). Each of the honeycomb bodies (H1 to Hn) of the honeycomb body (H) having the heater function has a mode of the current-carrying connection to the external electrode portion (6). (Iii) -1. External electrode part (6)
When the connection with the positive (+) pole of the first honeycomb body (B1) is the center electrode material (B1), the center electrode material (B1) in the first honeycomb body (H1).
The second honeycomb body (H2) is energized and connected to an energizing path from the outermost peripheral part to the center electrode material (B2) with respect to an energizing path from the outermost peripheral part to the outermost peripheral part. H3 to Hn) are energized and connected such that the energization paths of the first honeycomb body (H1) and the second honeycomb body (H2) are alternately realized, or (iii) -2. First honeycomb body (H1) and external electrode part (6)
When the connection with the positive (+) pole is the outermost peripheral portion, the center electrode material (B) starts from the outermost peripheral portion in the first honeycomb body (H1).
With respect to the energization path to 1), an energization path from the outermost peripheral portion to the center electrode material (B2 to Bn) is similarly realized in each of the honeycomb bodies (H2 to Hn) after the second honeycomb body. (Iii) -3. First honeycomb body (H1) and external electrode section (6)
If the connection to the positive (+) pole of
Central electrode material (B1) from the outermost periphery in the honeycomb body (H1)
In the second honeycomb body (H2), the power supply path is connected so as to be a power supply path from the center electrode material (B2) to the outermost peripheral portion.
3 to Hn), the first honeycomb body (H1) and the second honeycomb body (H2) are energized and connected so that energization paths are alternately realized. An exhaust gas purifying apparatus, characterized in that: 2. The exhaust gas purifying apparatus according to claim 1, wherein a width (thickness in an axial direction of the honeycomb body) (L) of each of the honeycomb bodies (H1 to Hn) is 5 to 100 mm. 3. The exhaust gas purifying apparatus according to claim 1, wherein a distance (D) between the honeycomb bodies (H1 to Hn) is 1 to 100 mm. 4. The exhaust gas purifying apparatus according to claim 1, wherein the honeycomb bodies (H1 to Hn) are fixed in respective metal cases (C1 to Cn). 5. The honeycomb body (H1 to Hn) and the main catalyst supporting body (M) are fixed in a metal case (C) constituting an exhaust gas purification device (A).
An exhaust gas purifying apparatus according to claim 1.