JPH0722018U - Metal catalytic converter - Google Patents

Abstract

(57) [Summary] [PROBLEMS] The present invention relates to a metal catalytic converter for purifying exhaust gas, and more specifically, to a means for holding the core part thereof, in which the clearance between the outer peripheral part of the core part and the inner peripheral surface of the container is reduced. An object of the present invention is to prevent exhaust gas bypass without management and to reliably hold the core portion in the container. [Structure] The container 2 is formed with bulging portions 2D, 2D, and a plurality of welding small holes 13 are formed in the bulging portion 2D along the circumferential direction. The ring members 8 and 9 are provided, and the outer ring members 14 and 15 are provided inside the bulging portion 2D of the container 2, respectively.
5 and the inner ring members 8 and 9 are in close contact with each other in the axial direction, the outer peripheral ends 17 of the outer ring members 14 and 15 and the small holes 13 of the container 2.
Is fixed by plug welding.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a metal catalytic converter for purifying exhaust gas, and more particularly to a holding means for its core.

[0002]

[Prior art]

 Generally, in order to purify exhaust gas, an exhaust system of an automobile is equipped with, for example, a metal catalytic converter shown in Japanese Utility Model Laid-Open No. 2-23213 (illustrated in FIG. 4).

In the figure, reference numeral 101 is a metal catalytic converter, and this metal catalytic converter 101 has a container 102, and a core portion 103 is accommodated in the container 102, and the core portion 103 is made of a metal corrugated plate. And a flat plate are wound in multiple layers.

Annular members 104 and 104 fixed to the container 102 are fitted to both ends of the outer peripheral portion 103 A of the core portion 103, and the annular members 104 and 104 are spaced from the end surface of the core portion 103 by a predetermined distance. The movement blocking portions 105, 105 to be arranged are respectively formed.

Further, the outer peripheral portion 103A of the core portion 103 and the inner peripheral surface 102A of the container 102 (the portion without the bead 102B) are designed to be in contact with each other.

[0006]

[Problems to be solved by the device]

 However, the annular members 104, 104 fitted on the inner peripheral surface 102A of the container 102 are in an assembled state due to the error accumulation of the individual products, and in the assembled state, the beads 102B and the annular members at both ends of the inner peripheral surface 102A of the container 102. There is a possibility that a gap may be generated between the inner sides of 104 and 104.

Further, although the movement preventing portions 105, 105 can keep the movement of the core portion 103 within a certain range, in order to hold the movement, the outer peripheral portion 103 A of the core portion 103 is fixed to the container 102. It is necessary to hold it on the inner peripheral surface 102A. Therefore, the inner peripheral surface 102A of the container 102 and the outer peripheral portion 103A of the core portion 103 are designed to be in contact with each other, but there is a possibility that a gap may occur due to error accumulation of the individual products. This gap causes an exhaust gas bypass phenomenon.

It should be noted that the clearance between the inner peripheral surface 102A of the container 102 and the outer peripheral portion 103A of the core portion 103 may be reduced, but since individual product parts manufactured as products always have a certain variation in width, There may always be a gap between the inner peripheral surface 102A of the core 102 and the outer peripheral portion 103A of the core part 103. Due to this gap, an exhaust gas bypass phenomenon occurs, and the core part 103 of the container 102 is formed. It becomes difficult to securely hold the.

In short, even if the clearance between the outer peripheral portion 103A of the core portion 103 and the inner peripheral surface 102A of the container 102 is managed, bypass of exhaust gas is prevented and the core portion 103 is securely held in the container 102. Is difficult.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to exhaust gas without controlling the clearance between the outer peripheral portion of the core portion and the inner peripheral surface of the container. It is an object of the present invention to provide a metal catalytic converter that can prevent a bypass and can reliably hold a core portion in a container.

[0011]

[Means for Solving the Problems]

 According to the present invention, in a metal catalytic converter in which metal plates are stacked to form a core portion and the core portion is housed in a container, the portion of the container facing both ends of the core portion is It is formed as a bulging part with a predetermined distance from the outer peripheral surface of the core part, and a plurality of small holes for welding are formed in the bulging part along the circumferential direction. Are fitted to the outer peripheral surface of the core portion, and the outer peripheral ends of the inner peripheral surface form a predetermined gap with the inner peripheral surface of the bulging portion of the container. The outer ring member and the inner ring member are respectively provided with an outer ring member whose end forms a predetermined gap with the outer peripheral surface of the core portion and whose outer peripheral end is fitted to the inner peripheral surface of the bulging portion of the container. It is characterized in that the outer peripheral edge of the outer ring member and the small hole of the container are fixed by plug welding in a state where they are in close contact with each other. To.

[0012]

[Action]

 In the present invention, since the outer ring member and the inner ring member are in close contact with each other in the axial direction, the exhaust gas flowing in from the front of the container is blocked by the outer ring member and the inner ring member, Bypass of exhaust gas is prevented.

Further, since the core portion is held between the two outer ring members fixed to the bulging portion of the container by plug welding, the core portion is held via the inner ring member fitted and fixed thereto. The core is held in the container.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show a metal catalytic converter according to an embodiment of the present invention.

In the figure, reference numeral 1 is a metal catalytic converter according to an embodiment of the present invention. The metal catalytic converter 1 has a container 2, which comprises half shells 2A and 2B. An upstream diffuser 4 is continuously formed at the front end of the body portion 3, and a downstream diffuser 5 is continuously formed at the rear end of the body portion 3.

A core portion 6 is housed in the container 2, and the core portion 6 is formed by winding a metal corrugated plate 6 A and a flat plate 6 B in multiple layers. Portions of the container 2 that face the vicinity of both ends of the core portion 6 are formed as bulging portions 2D, 2D at a predetermined distance from the outer peripheral surface 6C of the core portion 6, and the bulging portions 2D are arranged in the circumferential direction. A plurality of small holes 13 for welding are formed along the above.

Inner ring members 8 and 9 are provided at both ends of the core portion 6, respectively. The inner ring members 8 and 9 are fitted at their inner peripheral ends 10 to the outer peripheral surface 6 C of the core portion 6. At the same time, the outer peripheral end 12 forms a predetermined gap C1 with the inner peripheral surface 2C of the bulging portion 2D of the container 2.

Outer ring members 14 and 15 are provided inside the bulging portion 2D of the container 2, respectively, and an inner peripheral end 16 of the outer ring members 14 and 15 has a predetermined gap C2 with the outer peripheral surface 6C of the core portion 6. The outer peripheral end 17 is formed and is fitted to the inner peripheral surface 2C of the container 2.

With the outer ring members 14 and 15 pressed against the inner ring members 8 and 9 in the axial direction, the outer peripheral ends 17 of the outer ring members 14 and 15 and the small holes 13 of the container 2 are fixed by plug welding W. As a result, the outer ring members 14 and 15 are fixed to the container 2.

Then, the metal catalytic converter 1 is manufactured as follows. First, the core portion 6 is prepared, the inner ring members 8 and 9 are externally inserted from both axial ends of the core portion 6, and the inner peripheral ends 10 of the inner ring members 8 and 9 are attached to the outer peripheral surface 6C of the core portion 6. Fit them around both ends of each.

In this state, the outer ring members 14 and 15 are externally inserted from both axial ends of the core portion 6 and pressed against the inner ring members 8 and 9. Further, the container 2 is covered on the core portion 6, the inner ring members 8 and 9, and the outer ring members 14 and 15, and the inner ring members 8 and 9 are pressed against the outer ring members 14 and 15 by an appropriate jig, The outer ring members 14 and 15 are fixed to the container 2 by fixing the outer peripheral ends 17 of the outer ring members 14 and 15 and the small holes 13 of the container 2 by plug welding.

However, in this embodiment, the outer ring members 14 and 15 and the inner ring members 8 and 9 are in a state of being pressed against each other in the axial direction, so that the exhaust gas flowing from the front of the container 2 Is blocked by the outer ring members 14 and 15 and the inner ring members 8 and 9 to prevent bypass of exhaust gas.

Further, since the core portion 6 is held between the two outer ring members 14 and 15 fixed to the container 2 via the inner ring members 8 and 9 fitted and fixed thereto. The core 6 is held in the container 2.

According to the above configuration, the core portion 6 is interposed between the two outer ring members 14 and 15 fixed to the container 2 with the inner ring members 8 and 9 fitted and fixed thereto. Since the outer ring members 14 and 15 and the inner ring members 8 and 9 are pressed against each other in the axial direction to be in close contact with each other, the clearance between the core portion 6 and the container 2 is managed. Even if it does not, it is possible to prevent the bypass of the exhaust gas and reliably hold the core portion 6 in the container 2. In other words, the inner ring members 8 and 9 and the outer ring members 14 and 15 prevent the exhaust gas from bypassing the core portion 6 even if the accuracy of the core portion 6 and the container 2 is reduced and the clearance is not controlled. It can perform a holding function.

In the present embodiment, the core portion 6 is configured by winding the corrugated plate 6A and the flat plate 6B made of metal in multiple layers. However, the present invention is not limited to this mode, and the core portion is of a laminated type. Can also be applied to.

[0026]

[Effect of device]

 As described above, according to the present invention, the core portion is held between the two outer ring members fixed to the container via the inner ring member fitted and fixed to the outer ring member, and the outer ring member is fixed to the outer ring member. Since the ring member and the inner ring member are in close contact with each other in the axial direction, the bypass of exhaust gas is prevented and the core part is securely held in the container without controlling the clearance between the core part and the container. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a metal catalytic converter according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a main part of the same metal catalytic converter.

3 is a cross-sectional view taken along line XX of FIG.

FIG. 4 is a partial cross-sectional view of a conventional metal catalytic converter.

[Explanation of symbols]

 1 Metal Catalytic Converter 2 Container 2D Bulging Part 6 Core Part 8 Inner Ring Member 9 Inner Ring Member 13 Small Hole 14 Outer Ring Member 15 Outer Ring Member C1 Gap C2 Gap W Plug Welding

Claims (1)

[Scope of utility model registration request] 1. A metal catalytic converter in which metal plates (6A, 6B) are stacked to form a core part (6) and the core part (6) is housed in a container (2). The portion of (2) facing the vicinity of both ends of the core portion (6) is formed as a bulging portion (2D, 2D) with a predetermined distance from the outer peripheral surface (6C) of the core portion (6), A plurality of small holes (13) for welding are formed in the bulging portion (2D) along the circumferential direction, and the inner peripheral ends (10) of the core portion (6) are formed at both ends of the core portion (6). The outer peripheral surface (6C) is fitted and the outer peripheral end (1
The inner ring member (8, 2) formed by forming a predetermined gap (C1) with the inner peripheral surface (2C) of the bulging portion (2D) of the container (2).
9) are provided respectively, and the inner peripheral end (16) is provided inside the bulging portion (2D) of the container (2).
Is a predetermined gap (C2) from the outer peripheral surface (6C) of the core portion (6)
And outer ring members (14, 15) whose outer peripheral end (17) is fitted to the inner peripheral surface (2C) of the bulging portion (2D) of the container (2), respectively. 14, 15) and inner ring members (8, 9)
The outer ring member (14, 1
A metal catalytic converter characterized in that the outer peripheral end (17) of 5) and the small hole (13) of the container (2) are fixed by plug welding.