JPH0596421U - Electrode structure of electrothermal catalyst carrier - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] The present invention relates to improvement of an electrode structure of an electrothermal catalyst carrier of a metal catalyst converter mounted in an exhaust system of an internal combustion engine, particularly, an exhaust system of an automobile, and relates to a metal catalyst carrier and a rod-shaped electrode. The movement of the electrode in the axial direction of the
It is an object of the present invention to insulate the rod-shaped electrode from the mounting hole of the container and further reduce gas leakage from the container. [Structure] A support portion 10C is formed at the bottom end of the rod-shaped electrode 10 fixed to the side surface of the metal catalyst carrier 3, and the support portion 10C is formed outside the container 2.
The outer ceramic annular body 11 through which the rod-shaped electrode 10 penetrates is arranged, and the inner ceramic annular body 12 through which the rod-shaped electrode 10 penetrates is arranged between the inner wall surface of the container 2 and the support portion 10C of the rod-shaped electrode 10. 10 is provided with a tightening means 18 for pressing the inner ceramic annular body 12 against the inner wall surface of the container 2 and pressing the outer ceramic annular body 11 against the outer wall surface of the container 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in an electrode structure of an electrothermal catalyst carrier of a metal catalytic converter mounted on an exhaust system of an internal combustion engine, particularly an exhaust system of an automobile.

[0002]

[Prior Art]

 In an exhaust system of an internal combustion engine, for example, an exhaust system of an automobile, it is required that the catalyst carrier in the metal catalytic converter be rapidly heated and warmed at the start of engine operation. For example, in a metal catalytic converter, an electrothermal catalyst carrier for passing an electric current and resistance heating is housed in a container, and this electrothermal catalytic carrier requires a pair of electrodes as terminals for passing an electric current.

An electrothermal catalyst carrier having such a pair of electrodes is disclosed in, for example, Japanese Patent Application Laid-Open No. 3-245851 (illustrated in FIG. 8). In the figure, a metallic catalyst carrier 103 is housed in a metallic cylindrical container 101 with a ceramic mat 102 and a thermally expandable inorganic material mat 107 interposed therebetween.

Rod-shaped electrodes 104 and 105 are fixedly provided on both sides of the metal catalyst carrier 103. The rod-shaped electrodes 104 and 105 penetrate the ceramic mat 102 and the mounting holes of the cylindrical container and project outside the container 101 to form a rod-shaped electrode. The electrodes 104 and 105 are insulated from the mounting holes of the cylindrical container 101 via insulating bushes 106, respectively.

[0005]

[Problems to be solved by the device]

 However, in the conventional electrode structure of the electrothermal catalyst carrier, the metal catalyst carrier 103 in which the rod-shaped electrodes 104 and 105 are integrated is placed in the cylindrical container 101 due to the scattering of the heat-expandable material mat 107 due to use. On the other hand, it is easy to move in the axial direction of the electrodes, and accordingly, it is difficult to regulate the axial directions of the rod-shaped electrodes 104 and 105. Therefore, damage to the metal catalyst carrier 103, short circuit with the cylindrical container 101, generation of abnormal noise, and electrode Problems such as breakage of the power supply section to 104 and 105 may occur.

Further, as the electrode structure of the conventional electrothermal catalyst carrier, the one shown in FIG. 9 is known in addition to the one shown in FIG. In the figure, a metallic catalyst carrier 113 is accommodated in a metallic cylindrical container 111 via a thermally expandable inorganic material mat 112.

A pair of rod-shaped electrodes 114, 114 (only one is shown) are fixedly provided on both sides of the metal catalyst carrier 113, and the rod-shaped electrodes 114 penetrate through the mounting holes of the heat-expandable inorganic material mat 112 and the cylindrical container. Then, it projects outside the container 111. A short tubular holding member 115 is fixed to the outer wall surface of the tubular container 111, and the rod-shaped electrode 114 is surrounded by the insulating member 116 and a ceramic member that contacts the insulating member 116. The mat 117 is provided inside.

In the electrode structure of the electrothermal catalyst carrier, if the ceramic mat 117 is scattered during the process of use, a gap is generated between the insulating member 116 and the cylindrical container 111, and gas leakage easily occurs. Further, there is a problem that insulation between the rod-shaped electrode 114 and the mounting hole of the cylindrical container 111 is not reliable.

The present invention has been made to solve the above-mentioned problems, and its purpose is to restrict the axial movement of the metal catalyst carrier and the rod-shaped electrode and to attach the rod-shaped electrode and the container. It is an object of the present invention to provide an electrode structure of an electrothermal catalyst carrier, which is capable of achieving insulation from the above and further reducing gas leakage from the inside of the container.

[0010]

[Means for Solving the Problems]

 According to the first aspect of the present invention, a metal catalyst carrier is housed in a metal container with a thermally expandable inorganic material mat disposed between the outer side and the inner wall surface of the container. On both sides of the electrothermal catalyst carrier, in which the thermally expandable inorganic material mat and the rod-shaped electrodes penetrating through the mounting holes of the container and projecting outside the container are fixedly mounted, the rod-shaped electrode is attached to the side of the metal catalyst carrier. A supporting part is formed at the bottom end to be fixed, and an outer ceramic annular body through which the rod-shaped electrode penetrates is arranged outside the container, and the rod-shaped electrode penetrates between the inner wall surface of the container and the supporting part of the rod-shaped electrode. The inner ceramic annular body is arranged, and the rod-shaped electrode is provided with a fastening means for pressing the inner ceramic annular body against the inner wall surface of the container and the outer ceramic annular body against the outer wall surface of the container.

According to a second aspect of the present invention, a metal catalyst carrier is housed in a metal container with a thermally expansive inorganic material mat disposed between the outer side and the inner wall surface of the container. In the electrothermal catalyst carrier, in which the thermally expandable inorganic material mat and the rod-shaped electrodes projecting outside the container through the mounting holes of the container are fixedly provided on both sides of the catalyst carrier, the rod-shaped electrodes penetrate outside the container. The rod-shaped electrode is provided with a tightening means for pressing the outer ceramic annular body against the outer wall surface of the container, and the outer ceramic annular body is provided between the inner wall surface of the mounting hole of the container and the rod-shaped electrode. It is characterized by forming a small diameter portion to be inserted into the annular gap.

According to a third aspect of the present invention, a metal catalyst carrier is housed in a metal container with a thermally expandable inorganic material mat disposed between the outer side and the inner wall surface of the container, In the electrothermal catalyst carrier, in which the thermally expandable inorganic material mat and the rod-shaped electrodes penetrating through the mounting holes of the container and protruding outside the container are fixedly provided on both sides of the catalyst-made catalyst carrier, the metallic catalyst carrier of the rod-shaped electrode is used. A support part is formed at the bottom end fixed to the side surface of the container, the outer ceramic annular body through which the rod-shaped electrode penetrates is placed outside the container, and the rod-shaped electrode is placed between the inner wall surface of the container and the support part of the rod-shaped electrode. An inner ceramic annular body that penetrates through, and the rod-shaped electrode is provided with a tightening means for pressing the inner ceramic annular body against the inner wall surface of the container and the outer ceramic annular body against the outer wall surface of the container. At least a stick It is characterized in that it is arranged around the electrode.

According to a fourth aspect of the present invention, in a metal container, a metal catalyst carrier is housed with a thermally expansible inorganic material mat disposed between the outer side and the inner wall surface of the container, In the electrothermal catalyst carrier, in which the thermally expandable inorganic material mat and the rod-shaped electrodes projecting outside the container through the mounting holes of the container are fixedly provided on both sides of the catalyst carrier, the rod-shaped electrodes penetrate outside the container. The rod-shaped electrode is provided with a tightening means for pressing the outer ceramic annular body against the outer wall surface of the container, and the outer ceramic annular body is provided between the inner wall surface of the mounting hole of the container and the rod-shaped electrode. A small diameter portion to be inserted into the annular gap is formed, and the annular gasket is provided around at least one of the rod-shaped electrode and the small diameter portion of the outer ceramic annular body.

[0014]

[Action]

 According to the first aspect of the present invention, when the metal catalyst carrier integrated with the rod-shaped electrode tries to move to the outside of the side surface of the container, the inner ceramic annular body is pressed against the inner wall surface of the container by the supporting portion of the rod-shaped electrode. It

Therefore, the movement of the inner ceramic annular body is blocked by the inner wall surface of the container, and the movement of the rod-shaped electrode together with the metallic catalyst carrier is suppressed. On the other hand, when the metal catalyst carrier tries to move inward on the side surface of the container in the container, the rod-shaped electrode integrated with the metal catalyst carrier presses the outer ceramic annular body against the outer wall surface of the container through the fastening means. However, the movement of the outer ceramic annular body is blocked by the outer wall surface of the container, and the movement of the rod-shaped electrode together with the metal catalyst carrier is suppressed.

According to the second aspect of the present invention, when the metal catalyst carrier tries to move inwardly of the side surface of the container in the container, the rod-shaped electrode integrated with the metal catalyst carrier causes the outer ceramic to pass through the fastening means. The annular body is pressed against the outer wall surface of the container, but the movement of the outer ceramic ring body is blocked by the outer wall surface of the container, and the movement of the rod-shaped electrode together with the metal catalyst carrier is suppressed.

Further, since the small diameter part of the outer ceramic annular body is inserted into the mounting hole of the container, the rod-shaped electrode is insulated from the mounting hole of the container via the outer ceramic annular body, and the small diameter part The mounting hole is blocked.

According to the third aspect of the invention, in addition to the effect of the first aspect, the annular gasket reduces the leakage of exhaust gas from the thermally expandable inorganic material mat to the outside of the container.

According to the fourth aspect of the invention, in addition to the action of the second aspect, the annular gasket reduces the leakage of exhaust gas from the thermally expandable inorganic material mat to the outside of the container.

[0020]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The electrode structure of the electrothermal catalyst carrier according to the first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the present invention is applied to a catalytic converter for automobiles.

In the figure, reference numeral 1 indicates a metal catalyst converter, and this metal catalyst converter 1 has a tubular container 2, and a metallic catalyst carrier 3 is housed in the central portion of the tubular container 2. .. The metallic catalyst carrier 3 is surrounded and held by a front cylindrical insulating material 4 and a rear cylindrical insulating material 5 arranged inside the cylindrical container 2. Buffer members 6 and 7 are arranged between the cylindrical insulating members 4 and 5 and the tubular container 2 in the radial direction, and a thermally expansive inorganic material is disposed between the buffer members 6 and 7 in the front-rear direction. Mats 8 and 9 are arranged outside the front cylindrical insulating material 4 and the rear cylindrical insulating material 5.

Rod-shaped electrodes 10 and 10 are fixedly provided on both sides of the metal catalyst carrier 3, and an outer screw 10 B is cut at the tip of the rod-shaped electrode 10. The rod-shaped electrode 10 is made of a thermally expansible inorganic material mat 8, 9 and through the mounting holes 2A formed in the cylindrical container 2 to project to the outside of the cylindrical container 2. At the bottom end of the rod-shaped electrode 10, a supporting portion made of a disc body 10C is formed.

The outer ceramic annular body 11 through which the rod-shaped electrode 10 penetrates is arranged outside the cylindrical container 2, and the rod-shaped electrode is provided between the inner wall surface of the cylindrical container 2 and the disc body 10C of the rod-shaped electrode 10. An inner ceramic annular body 12 through which 10 passes is arranged. A small diameter portion 11A is formed in the outer ceramic annular body 11, and the small diameter portion 11A is inserted into an annular gap 2C between the inner peripheral wall surface of the mounting hole 2A of the cylindrical container 2 and the rod-shaped electrode 10.

The first annular gasket 13 is arranged around the bottom end of the rod-shaped electrode 10, and the second annular gasket 14 and the third annular gasket 15 are arranged around the small diameter portion 11A. A fourth annular gasket 16 is arranged around the vicinity of the tip of 10. Stainless steel, carbon, or the like is used as the material of the gasket.

The first annular gasket 13 is arranged between the bottom portion 10 C of the rod-shaped electrode 10 and the inner side surface of the inner ceramic annular body 12, and the second annular gasket 14 is connected to the outer side surface of the inner ceramic annular body 12 and the cylinder. The third annular gasket 15 is arranged between the inner wall surface of the cylindrical container 2, the third annular gasket 15 is arranged between the outer wall surface of the cylindrical container 2 and the inner side surface of the outer ceramic annular body 11, and the fourth annular gasket 16 is the outer ceramic annular body. It is arranged on the outer surface of the body 11.

The rod-shaped electrode 10 is screwed with a tightening means including a nut 18 for pressing the inner ceramic annular body 12 and the outer ceramic annular body 11 close to each other and pressing the tubular container 2.

A washer 19 is arranged around the rod-shaped electrode 10 between the nut 18 and the fourth annular gasket 14. When the nut 18 is tightened to the outer screw 10B of the rod-shaped electrode 10, the nut 18, washer 19, fourth annular gasket 16, outer ceramic annular body 11, third annular gasket 15, inner ceramic annular body 12, second annular ring. The gasket 14 and the first annular gasket 13 are pressed against each other.

Then, when the metal catalyst carrier 3 tries to move outward on the side surface of the cylindrical container 2, the inner ceramic annular body 12 is pressed outward by the disc body 10C of the rod-shaped electrode 10, and The outer side surface is pressed against the second annular gasket 14 inside the inner wall surface of the cylindrical container 2.

Therefore, the movement of the inner ceramic annular body 12 is blocked by the inner wall surface of the cylindrical container 2, and the movement of the rod-shaped electrode 10 together with the metallic catalyst carrier 3 is suppressed. On the other hand, when the metallic catalyst carrier 3 integrated with the rod-shaped electrode 10 in the cylindrical container 2 tries to move inward on the side surface of the cylindrical container 2, the rod-shaped electrode 10 integrated with the metallic catalyst carrier 3 causes the nut 18 to move. The outer ceramic annular body 11 is pressed by the third annular gasket 15 on the outer wall surface of the cylindrical container 2 via the, but the movement of the outer ceramic annular body 11 is blocked by the outer wall surface of the cylindrical container 2, The movement of the manufactured catalyst carrier 3 is suppressed.

According to the configuration as described above, the rod-shaped electrode 10 integrated with the metallic catalyst carrier 3 is axially moved with respect to the cylindrical container 2 as the metallic catalyst carrier 3 moves in the cylindrical container 2. Even if this is done, the inner ceramic annular body 12 and the outer ceramic annular body 11 can function as stoppers when the rod-shaped electrode 10 moves via the rod-shaped electrode 10 and the nut 18, so that the rod-shaped electrode 10 Can be held in a fixed state in the cylindrical container 2, and the rod-shaped electrode 10 can be reliably regulated in the axial direction.

Since the small diameter portion 11 A of the outer ceramic annular body 11 is inserted into the annular gap 2 C of the cylindrical container 2, the rod-shaped electrode 10 is attached to the cylindrical container 2 via the outer ceramic annular body 11. The rod-shaped electrode 10 is insulated from the hole 2A, the contact between the rod-shaped electrode 10 and the inner peripheral wall surface of the mounting hole 2A of the cylindrical container 2 can be prevented, and the rod-shaped electrode 10 can be surely insulated. Since the gap in the mounting hole of the container is closed by the small diameter portion 11A of the outer ceramic annular body 11, it is possible to reduce the leakage of exhaust gas.

Further, the first annular gasket 13 and the fourth annular gasket 16 are arranged around the rod-shaped electrode 10, and the second annular gasket 14 and the third annular gasket 15 are attached to the small diameter portion 11 A of the outer ceramic annular body 11. Since it is arranged around the rod-shaped electrode, the exhaust gas passing around the rod-shaped electrode 10 can be surely blocked and the leakage of the exhaust gas can be reduced.

In this embodiment, the outer ceramic annular body 11 is formed with the small diameter portion 11A, and the small diameter portion 11A is inserted into the annular gap 2C of the cylindrical container 2. Even without the portion 11A, the rod-shaped electrode 10 can be reliably regulated in the axial direction.

Further, in this embodiment, the first annular gasket 13 and the fourth annular gasket 16 are arranged around the rod-shaped electrode 10, and the second annular gasket 14 and the third annular gasket 15 are made of outer ceramic. Although it is arranged around the small-diameter portion 11A of the annular body 11, the rod-shaped electrode 10 can be reliably regulated in the axial direction without these.

FIG. 3 shows the electrode structure of the electrothermal catalyst carrier according to the second embodiment of the present invention, and only the parts different from the first embodiment will be described. In this embodiment, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, a ceramic adhesive 21 is filled around the rod-shaped electrode 10 between the bottom surface of the small diameter portion 11 A of the outer ceramic annular body 11 and the inner bottom portion 12 A of the inner ceramic annular body 12. .. According to the second embodiment, in addition to the effect of the first embodiment, the ceramic adhesive 21 can surely block the exhaust gas passing around the rod-shaped electrode 10 and reduce the leakage of the exhaust gas. ..

FIGS. 4 and 5 show an electrode structure of an electrothermal catalyst carrier according to a third embodiment of the present invention, and only parts different from those of the first embodiment will be described. In this embodiment, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the first embodiment, the outer electrode 10B of the rod-shaped electrode 10 is provided with the tightening device which is formed by screwing the tightening device including the nut 18 into the outer electrode 10B. The rod-shaped electrode 31 is provided with a tightening means by cutting an inner screw 31A into the rod-shaped electrode 31 and screwing a tightening means composed of a bolt 32 into the inner screw 31A. The annular gaskets 15A and 16A are arranged on the upper side of the cylindrical container 2, but the annular gaskets corresponding to the first annular gasket 13 and the second annular gasket 14 of the first embodiment are omitted. Further, as shown in FIG. 6, annular gaskets 33 and 34 corresponding to the first annular gasket 13 and the second annular gasket 14 of the first embodiment can be arranged.

According to the third embodiment, the same effect as the first embodiment can be obtained. FIG. 7 shows an electrode structure of an electrothermal catalyst carrier according to a fourth embodiment of the present invention. In the figure, reference numeral 41 indicates a metal catalyst converter, and this metal catalyst converter 41 has a tubular container 42, and a metallic catalyst carrier 43 is housed in the central portion of the tubular container 42. A thermally expandable inorganic material mat 44 is arranged between the outside of the metallic catalyst carrier 43 and the inner wall surface of the cylindrical container 42.

Rod-shaped electrodes 45, 45 (only one is shown) are fixedly mounted on both sides of the metal catalyst carrier 43, and an outer screw 45 B is cut at the tip of the rod-shaped electrode 45, so that the rod-shaped electrode 45 is heated. The inflatable inorganic material mat 44 and the mounting hole 42 </ b> A formed in the tubular container 42 are penetrated and projected to the outside of the tubular container 42. At the bottom end of the rod-shaped electrode 45, a support portion composed of a disc body 45C is formed.

An outer ceramic annular body 46 through which a rod-shaped electrode 45 penetrates is arranged outside the cylindrical container 42. A small diameter portion 46A is formed in the outer ceramic annular body 46, and the small diameter portion 46A is inserted into the annular gap 42C between the inner peripheral wall surface of the mounting hole 42A of the cylindrical container 42 and the rod-shaped electrode 45.

A first annular gasket 47 is arranged around the small diameter portion 46 A, and the first annular gasket 47 is positioned between the outer wall surface of the cylindrical container 42 and the inner side surface of the outer ceramic annular body 46. There is. A second annular gasket 48 is arranged around the rod-shaped electrode 46, and the second annular gasket 48 is located on the outer surface of the outer ceramic annular body 46.

The rod-shaped electrode 45 is screwed with a tightening means including a nut 49 for pressing the outer ceramic annular body 46 against the cylindrical container 42. A washer 50 is arranged around the rod-shaped electrode 45 between the nut 49 and the second annular gasket 48.

Since the fourth embodiment has a structure in which the inner ceramic annular body 12 of the first embodiment is not mounted, it is the same as the first embodiment except for the effect of restricting the outward movement of the rod electrode 45. Has the same effect.

In the above embodiment, an example in which the present invention is applied to a catalytic converter for an automobile has been described, but the present invention is not limited to the above embodiment and can be widely applied to a catalytic converter for an internal combustion engine.

[0046]

[Effect of the device]

 As described above, according to the first aspect of the invention, the rod-shaped electrode integrated with the metal catalyst carrier moves axially with respect to the container as the metal catalyst carrier moves in the container. However, the inner ceramic annular body and the outer ceramic annular body can function as stoppers during movement of the rod-shaped electrode through the rod-shaped electrode and the tightening means, so that the rod-shaped electrode is held in a fixed state in the container. Therefore, the rod-shaped electrode can be reliably regulated in the axial direction.

According to the second aspect of the present invention, even if the rod-shaped electrode integrated with the metal catalyst carrier moves axially with respect to the container as the metal catalyst carrier moves in the container, the rod-shaped electrode Since the outer ceramic annular body can function as a stopper when the rod-shaped electrode moves through the electrode and the tightening means, the rod-shaped electrode can be held in a fixed state in the container, and the rod-shaped electrode shaft can be held. It is possible to reliably regulate the direction.

Further, since the small diameter portion of the outer ceramic annular body is inserted into the mounting hole of the container, the rod-shaped electrode is insulated from the mounting hole of the container through the outer ceramic annular body, and the rod-shaped electrode and the container are mounted. It is possible to prevent contact with the inner wall surface of the hole and ensure the insulation of the rod-shaped electrode.Because the gap in the mounting hole of the container in the conventional example is closed by the small diameter part of the outer ceramic ring, The leakage of exhaust gas can be reduced.

According to the third aspect of the invention, since the annular gasket is arranged around at least the rod-shaped electrode, in addition to the invention of the first aspect, the exhaust gas passing around the rod-shaped electrode is blocked. It is possible to ensure the reliability and reduce the leakage of exhaust gas.

According to the invention of claim 4, in addition to the invention of claim 2, since the annular gasket is provided around at least one of the circumference of the rod-shaped electrode or the small diameter portion of the outer ceramic annular body, the rod-shaped gasket is formed. It is possible to reliably block the exhaust gas passing around the electrodes and reduce the leakage of the exhaust gas.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an electrothermal catalyst carrier having an electrode structure according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the electrode structure of the electrothermal catalyst carrier of the first embodiment.

FIG. 3 is a sectional view of an electrode structure of an electrothermal catalyst carrier according to a second embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view of an electrothermal catalyst carrier provided with an electrode structure according to a third embodiment of the present invention.

FIG. 5 is a sectional view of an electrode structure of an electrothermal catalyst carrier according to a third embodiment of the present invention.

FIG. 6 is a sectional view of an electrode structure of an electrothermal catalyst carrier according to a modification of the third embodiment.

FIG. 7 is a sectional view of an electrode structure of an electrothermal catalyst carrier according to a fourth embodiment.

FIG. 8 is a sectional view showing an electrode structure of a conventional first electrothermal catalyst carrier.

FIG. 9 is a cross-sectional view of an electrode structure of a conventional second electrothermal catalyst carrier.

[Explanation of symbols]

 2 Cylindrical container 2A Mounting hole 2C Annular gap 3 Metal catalyst carrier 8 Thermally expandable inorganic material mat 9 Thermally expandable inorganic material mat 10 Rod-shaped electrode 10C Disc body (supporting part) 11 Outer ceramic annular body 11A Small diameter part 12 Inner Ceramic annular body 18 Nut (tightening means)

Claims (4)

[Scope of utility model registration request] 1. A metal catalyst carrier (3) is provided in a metal container (2), and a thermally expandable inorganic material mat (8, 9) is provided between the outside thereof and the inner wall surface of the container (2). The metal catalyst carrier (3) is arranged and accommodated, and the heat-expandable inorganic material mats (8, 9) and the mounting holes (2A) of the container (2) are penetrated on both sides of the metal catalyst carrier (3) to project outside the container (2). In the electrothermal catalyst carrier having the rod electrodes (10, 10) fixed to each other, a support portion (10C) is fixed to the bottom end of the rod electrode (10) fixed to the side surface of the metal catalyst carrier (3). The outer ceramic annular body (11) which is formed and penetrates the rod-shaped electrode (10) is arranged outside the container (2), and the inner wall surface of the container (2) and the support portion (10C) of the rod-shaped electrode (10).
The inner ceramic annular body (12), through which the rod-shaped electrode (10) penetrates, is arranged between the rod-shaped electrode (10) and the inner ceramic annular body (12).
An electrode structure of an electrothermal catalyst carrier, characterized in that a fastening means (18) for pressing the inner wall surface of the container (2) and the outer ceramic annular body (11) against the outer wall surface of the container (2) is provided. 2. A metal catalyst carrier (43) is placed in a metal container (42), and a thermally expandable inorganic material mat (44) is placed between the outside of the metal catalyst carrier (43) and the inner wall surface of the container (42). A rod-shaped electrode (2) which is housed in the metal catalyst carrier (43) and penetrates the thermally expandable inorganic material mat (44) and the mounting hole (42A) of the container (42) on both sides of the metal catalyst carrier (43) and projects outside the container (42). 45, 45)
In the electrothermal catalyst carrier in which each is fixed, the outer ceramic annular body (46) through which the rod-shaped electrode (45) penetrates is arranged outside the container (42), and the outer ceramic annular body (46) is attached to the rod-shaped electrode (45). 46)
Means for pressing the container against the outer wall surface of the container (42) (49)
The outer ceramic annular body (46) is provided with a container (4
2) Inner wall surface of the mounting hole (42A) and rod-shaped electrode (45)
The small diameter portion (46) inserted into the annular gap (2C) between
An electrode structure of an electrothermal catalyst carrier, characterized in that A) is formed. 3. A metal catalyst carrier (3) is provided in a metal container (2), and a thermally expandable inorganic material mat (8, 9) is provided between the outside of the metal catalyst carrier (3) and the inner wall surface of the container (2). The metal catalyst carrier (3) is arranged and accommodated, and the heat-expandable inorganic material mats (8, 9) and the mounting holes (2A) of the container (2) are penetrated on both sides of the metal catalyst carrier (3) to project outside the container (2). In the electrothermal catalyst carrier having the rod electrodes (10, 10) fixed to each other, a support portion (10C) is fixed to the bottom end of the rod electrode (10) fixed to the side surface of the metal catalyst carrier (3). The outer ceramic annular body (11) which is formed and penetrates the rod-shaped electrode (10) is arranged outside the container (2), and the inner wall surface of the container (2) and the support portion (10C) of the rod-shaped electrode (10).
The inner ceramic annular body (12), through which the rod-shaped electrode (10) penetrates, is arranged between the rod-shaped electrode (10) and the inner ceramic annular body (12).
Is provided on the inner wall surface of the container (2) and the outer ceramic annular body (11) is pressed on the outer wall surface of the container (2), and the annular gasket (13, 16) is at least the rod-shaped electrode. An electrode structure of an electrothermal catalyst carrier, which is arranged around (45). 4. A metal catalyst carrier (43) is placed in a metal container (42), and a heat-expandable inorganic material mat (44) is arranged between the outside of the metal catalyst carrier (43) and the inner wall surface of the container (42). A rod-shaped electrode (2) which is housed in the metal catalyst carrier (43) and penetrates the thermally expandable inorganic material mat (44) and the mounting hole (42A) of the container (42) on both sides of the metal catalyst carrier (43) and projects outside the container (42). 45, 45)
In the electrothermal catalyst carrier in which each is fixed, the outer ceramic annular body (46) through which the rod-shaped electrode (45) penetrates is arranged outside the container (42), and the outer ceramic annular body (46) is attached to the rod-shaped electrode (45). 46)
Means for pressing the container against the outer wall surface of the container (42) (49)
The outer ceramic annular body (46) is provided with a container (4
2) Inner wall surface of the mounting hole (42A) and rod-shaped electrode (45)
The small diameter portion (46) inserted into the annular gap (2C) between
A), and an annular gasket (47, 48) is provided around at least one of the rod-shaped electrode (45) and the small diameter portion (46A) of the outer ceramic annular body (46). Electrode structure of catalyst carrier.