JP2533926Y2 - Electric heating catalyst carrier - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalyst carrier mounted on an automobile, an industrial vehicle, etc. for purifying exhaust gas, and more particularly, to an electric heating catalyst for heating a catalyst carrier by electricity. Carrier.

[0002]

2. Description of the Related Art Generally, a catalytic converter is disposed in an exhaust system of an automobile to purify exhaust gas.
In such a catalytic converter, when the temperature of the catalyst carrier is low, the catalyst is not activated, so that there is a problem that it is difficult to sufficiently purify the exhaust gas when starting the engine or the like.

Therefore, for example, Japanese Patent Application Laid-Open No. 2-223622
As disclosed in Japanese Patent Application Laid-Open Publication No. H11-157, an electrically heated catalyst carrier has been developed in which the temperature of the catalyst carrier is low and the catalyst carrier is heated by electricity when starting an engine or the like. FIG.
Represents this type of electrically heated catalyst carrier, in which the electrode 11 on one side is disposed in the center,
An electrode 13 on the other side is arranged so as to surround the electrode 11.

[0004] The electrode 11 on one side and the electrode 13 on the other side
And a plate-like catalyst carrier 15 made of a conductive metal is disposed between the first and second ends of the catalyst carrier 15.
7 is connected to the electrode 11 on one side and the electrode 13 on the other side. In such an electrically heated catalyst carrier, when a voltage is applied between the electrode 11 on one side and the electrode 13 on the other side, the catalyst carrier 15 is energized and the catalyst carrier 15 is moved by the electric resistance of the catalyst carrier 15. Fever.

[0005]

However, in such an electrically heated catalyst carrier, the electrode 1 of the catalyst carrier 15 is not provided.
Since the resistance of the weld 17 to the first and the third 13 becomes larger than the resistance of the catalyst carrier 15, the temperature in the vicinity of the weld 17 of the catalyst carrier 15 rises abnormally, and the catalyst carrier 15 is uniformly heated. There was a problem that it became difficult.

The catalyst carrier 15 is connected to the electrodes 11 and 13.
In addition, since it is fixed by the welding 17, a large number of steps are required for the welding 17, and it is difficult to securely and firmly fix the catalyst carrier 15 to the electrodes 11, 13. Was. The present invention has been made to solve such a conventional problem, and an electric heating catalyst carrier capable of uniformly heating the catalyst carrier and securely and firmly fixing the catalyst carrier to the electrode is provided. The purpose is to provide.

[0007]

The electrically heated catalyst carrier according to the present invention has a catalyst carrier made of a conductive metal disposed between a pair of electrodes, and the electrodes carry electricity to the catalyst carrier. In an electrically heated catalyst carrier that causes a catalyst carrier to generate heat, the catalyst carrier has one end connected to the one electrode and the other catalyst carrier connected to the other electrode. The one-side catalyst carrier and the other-side catalyst carrier are brought into contact with each other at a plurality of locations, and the contact portions are joined together, and the electrode is formed with a slit portion in the axial direction from one end side. In the state where one end of the one-side catalyst carrier or the other-side catalyst carrier is inserted into the slit portion, a nut member is screwed into a screw portion formed on the one end side of the rod member, and the slit portion is formed. The distance between the one side One end of the media bearing member or the other side catalyst support is made by sandwiching a pressing state.

[0008]

With the electrically heated catalyst carrier of the present invention, the electric resistance at the junction between the one-side catalyst carrier and the other-side catalyst carrier is large,
Heat is generated at the joint. In addition, when one end of the one-side catalyst carrier or one end of the other-side catalyst carrier is inserted into the slit portion of the rod-shaped member, when the nut member is screwed into the screw portion, the interval between the slit portions is narrowed, and the one-side catalyst carrier. Alternatively, one end of the other-side catalyst carrier is fixed to the rod-shaped member in a pressed state.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; FIGS. 1 and 2 show an embodiment of the electrically heated catalyst carrier of the present invention.
Reference numerals 1 and 33 denote one-side electrodes and other-side electrodes arranged at predetermined intervals.

A plurality of plate-like catalyst carriers 35 made of a conductive metal such as stainless steel are arranged between these electrodes 31 and 33. These catalyst carriers 3
Reference numeral 5 denotes a one-side catalyst carrier 37 having one end connected to the one-side electrode 31 and another-side catalyst carrier 39 having one end connected to the other-side electrode 33. And the other-side catalyst carrier 39 are arranged alternately.

The one-side catalyst carrier 37 is formed in a wave shape.
The other-side catalyst carrier 39 is formed in a flat plate shape. Then, the top 41 of the wave of the one-side catalyst carrier 37 is brought into contact with the adjacent other-side catalyst carrier 39 at a plurality of locations, and the contact portions are joined to form a joint 43.

The top 41 of the one-side catalyst carrier 37 has
The bonding with the other-side catalyst carrier 39 is performed by accommodating the top 41 of the one-side catalyst carrier 37 and the other-side catalyst carrier 39 in a high-temperature atmosphere and performing diffusion bonding. It is performed by FIG. 3 shows the details of the one-side electrode 31 and the other-side electrode 33, and reference numeral 45 indicates a cylindrical rod-shaped member made of, for example, copper.

A slit portion 47 is formed in the rod-like member 45 in the axial direction from one end side. For example, several to about 10 one-side catalyst carriers 37 or one ends of the other-side catalyst carriers 39 are inserted into the slit portions 47.
A thread portion 49 is formed on one end of the rod-shaped member 45, and a nut member 51 is screwed into the thread portion 49.

The screw portion 49 is formed of a tapered screw having a tapered tip, and the gap between the slit portions 47 is reduced by screwing the nut member 51. Then, by screwing the nut member 51 to the screw portion 49, one end of the one-side catalyst carrier 37 or the other-side catalyst carrier 39 is held in a pressed state. In this embodiment, at both ends of the rod-shaped member 45, mounting portions 53 for fixing the rod-shaped member 45 are integrally formed on an end plate described later.

In this embodiment, one ends of the plurality of one-side catalyst carriers 37 and the other-side catalyst carriers 39 inserted into the same slit portion 47 are welded to each other, and a rod-shaped member 45 is provided. Are joined by welding. FIG.
FIG. 5 shows a metal catalytic converter configured by using a plurality of the electrically heated catalyst carriers configured as described above.

In these figures, reference numeral 55 indicates a rectangular cylindrical container. End plates 57 and 59 made of an insulator are arranged on one side and the other side of the cylindrical container 55, and an exhaust gas inlet 61 is formed on one end plate 57, and the other end plate is formed. An exhaust gas outlet 63 is formed at 59. In the cylindrical container 55, the three electrically heated catalyst carriers 65 described above are arranged at predetermined intervals in the vertical direction.

Further, through holes 67 are formed in the end plates 57 and 59 at predetermined intervals in the vertical direction, and the mounting portions 53 of the rod-shaped members 45 are inserted into the through holes 67. . A lead wire 69 is attached to the mounting portion 53 of the rod-shaped member 45.
The lower rod-shaped member 45 is connected to a power source 71 such as a battery.

Thus, in the electric heating catalyst carrier configured as described above, the catalyst carrier 35 is composed of one catalyst carrier 37 having one end connected to one electrode 31 and the other electrode carrier 3.
3, one end of which is connected to the other-side catalyst carrier 39, the one-side catalyst carrier 37 and the other-side catalyst carrier 39 are brought into contact with each other at a plurality of places, and the contact portions are joined together.
The electrodes 31 and 33 are connected to the slit portion 4 from one end in the axial direction.
7 is formed by the rod-shaped member 45 on which one end of the one-side catalyst carrier 37 or one end of the other-side catalyst carrier 39 is inserted into the slit portion 47, and a screw portion 49 formed on one end side of the rod-shaped member 45. The nut member 51 is screwed into the slit portion 4
7, the one end of the one-side catalyst carrier 37 or one end of the other-side catalyst carrier 39 is held in a pressed state, so that the catalyst carrier 35 can be uniformly heated and the catalyst carrier 35 can be connected to the electrode 31. , 33 can be securely and firmly fixed.

That is, in the electrically heated catalyst carrier configured as described above, when a voltage is applied between the one side electrode 31 and the other side electrode 33, the one side catalyst carrier 37 and the other side catalyst carrier 39 Are connected at the joining portion 43, electricity is supplied to the other-side catalyst carrying member 39 through the one-side catalyst carrying member 37 and the joining portion 43, but the one-side catalyst carrying member 37 and the other-side catalyst carrying member Since the electrical resistance increases at the junction 43 with 39 and the heat generation at the junction 43 increases, only the temperature in the vicinity of the welding portion of the catalyst carrier to the electrode does not extremely rise as in the related art. In addition, the catalyst carrier 35 can be easily heated uniformly.

In the electrically heated catalyst carrier configured as described above, the screw portion 49 is inserted into the slit portion 47 of the rod member 45 with one end of the one-side catalyst carrier 37 or one end of the other-side catalyst carrier 39 inserted. When the nut member 51 is screwed into
The interval between the slit portions 47 is narrowed, and the one-side catalyst carrier 37
Alternatively, since one end of the other-side catalyst carrier 39 is fixed to the rod-shaped member 45 in a pressed state, the catalyst carrier 35 is connected to the electrode 31,
It is easily possible to securely and firmly adhere to the projection 33.

In the embodiment described above, an example is described in which the one-side catalyst carrier 37 is corrugated and the top 41 of the waveform is joined to the other-side catalyst carrier 39, but the present invention is not limited to such an embodiment. The present invention is not limited to this. For example, it is a matter of course that protrusions may be formed on the one-side catalyst support at appropriate intervals, and the protrusions may be joined to the other-side catalyst support. Further, in the embodiment described above, an example in which the other-side catalyst carrier 39 is formed in a flat plate shape is described. However, the present invention is not limited to such an embodiment. Needless to say, a small wave form in which a waveform with a small amplitude is formed may be used.

[0022]

As described above, in the electrically heated catalyst carrier of the present invention, the catalyst carrier has one end connected to one electrode and one end connected to the other electrode. The other side catalyst carrier is constituted by the other side catalyst carrier, the one side catalyst carrier and the other side catalyst carrier are brought into contact with each other at a plurality of places, and the contact portions are joined together, and the electrode is formed from one end side in the axial direction in the slit portion. A nut member is screwed into a screw portion formed on one end side of the rod-shaped member in a state in which one end of the one-side catalyst carrier or the other-side catalyst carrier is inserted into the slit portion. The gap between the parts is narrowed, and one end of the one-side catalyst support or the other-side catalyst support is held in a pressed state, so that the catalyst support can be heated uniformly and the catalyst support is fixed firmly and firmly to the electrode It is possible to do.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the electrically heated catalyst carrier of the present invention.

FIG. 2 is a top view showing the electrically heated catalyst carrier of FIG.

FIG. 3 is a side view showing details of a rod-shaped member of the electrode of FIG. 1;

FIG. 4 is a perspective view showing a metal catalytic converter constituted by using a plurality of the electrically heated catalyst carriers of FIG. 1;

FIG. 5 is a cross-sectional view cut in a horizontal direction at a position above an upper electrically heated catalyst carrier in FIG.

FIG. 6 is an explanatory view showing an example of a conventional electrically heated catalyst carrier.

[Explanation of symbols]

 31 One-side electrode 33 Other-side electrode 35 Catalyst carrier 37 One-side catalyst carrier 39 Other-side catalyst carrier 43 Joining part 45 Bar-shaped member 47 Slit part 49 Screw part 51 Nut member

 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-277916 (JP, A) JP-A-3-295184 (JP, A) JP-A-3-500911 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A catalyst carrier (35) made of a conductive metal is disposed between a pair of electrodes (31, 33), and the catalyst carrier (35) is energized by the electrodes (31, 33). Then, in the electrically heated catalyst carrier for causing the catalyst carrier (35) to generate heat, the catalyst carrier (35) is replaced with a one-side catalyst carrier (37) having one end connected to the one electrode (31).
And the other-side catalyst carrier (39) having one end connected to the other electrode (33). The one-side catalyst carrier (37) and the other-side catalyst carrier (39) are provided at a plurality of locations. The electrodes (31, 33) are formed by a rod-shaped member (45) having a slit (47) formed in the axial direction from one end side,
With one end of the one-side catalyst carrier (37) or the other-side catalyst carrier (39) inserted into the slit portion (47), the screw portion (4) formed on the one end side of the rod-shaped member (45) is formed.
Nut member (51) is screwed into 9) and slit portion (47)
An electrically heated catalyst carrier characterized by narrowing the distance between the two and holding one end of the one-side catalyst carrier (37) or the other-side catalyst carrier (39) in a pressed state.