JPH0720334Y2 - Exhaust gas purification catalytic converter - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is directed to carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NO _x ) which are harmful gas components emitted from internal combustion engines and the like. Is a catalytic converter for purifying exhaust gas for making the vehicle harmless.

More specifically, the present invention relates to an exhaust gas purifying catalytic converter in which a catalyst container in which a catalyst is set can be detached.

[Conventional technology]

As disclosed in Japanese Utility Model Laid-Open No. 61-137824, an exhaust gas purifying catalytic converter includes an inlet casing having an inlet, an outlet casing having an outlet, and a catalyst container portion connected between these inlet and outlet casings. Made of

[Problems to be solved by the invention]

When the catalyst set in the catalytic converter for exhaust gas purification changes the catalyst due to deterioration of performance due to high temperature or long-term use, the catalyst that is heavy when the inlet and outlet casings are set in the exhaust pipe To attach and detach the container part, a large number of bolts and nuts had to be removed, and a special jig and heavy equipment were required, which required a large amount of work.

Further, when the catalyst container is moved during the catalyst replacement, the catalyst, the heat-expandable packing, the deposits, etc. enter the exhaust pipe,
There was a risk of problems such as increased back pressure.

[Means for solving problems]

The present invention is a catalytic converter devised to solve the above problems.

That is, in the exhaust gas purifying catalytic converter, a detachable rail and an inspection hole plate are provided in order to easily detach the catalyst container with the catalyst set.

Further, it is a catalytic converter further provided with a rail for inserting the receiving plate so that the catalyst, the heat-expandable packing, the adhered matters, etc. do not enter the exhaust pipe when the catalyst is replaced.

[Action]

By providing the attachment / detachment rails and the inspection hole plate above and below the catalyst container in the casing body, the catalyst container can be smoothly attached / detached and the catalyst can be easily replaced.

Further, a rail is provided to insert a receiving plate for receiving falling objects such as packings and deposits which are dropped by pulling out the catalyst container when replacing the catalyst, and by inserting the receiving plate, it is possible to prevent the falling objects into the exhaust pipe.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 3, the exhaust gas purifying catalytic converter 1 is installed in the middle of the exhaust pipe 3 of the engine 2 to purify harmful components in the exhaust gas, and the purified exhaust gas passes through the silencer 4. It is designed to be released into the atmosphere via As shown in FIG. 1, the catalytic converter 1 includes a casing body 5, an inspection hole plate 6, and a catalyst container 7. In the casing body 5, the funnel portion 9 is welded to the rectangular tube-shaped short tube 8,
A short pipe 11 serving as an exhaust gas inlet 10 is welded to the upper portion of the funnel portion 9, and a flange 12 for connecting to the exhaust pipe 3 is welded to the short pipe 11.

A rectangular tube-shaped short tube 13 having a flange 15 is welded to the left side of the rectangular tube-shaped short tube 8, and an inspection hole plate 6 is inserted through a heat-expansive packing 14 and a bolt 16 is inserted through a washer 17. The nut 18 is fixed by screwing.

Inside the rectangular tube-shaped short tube 8, an upper rail 20 and a lower rail 19 for attaching and detaching the catalyst container 7 are provided. An inspection hole plate 6 is provided between the upper rail 20 and the lower rail 19 for attachment / detachment.
The catalyst container 7 that can be pulled out to the outside is installed in the short pipe 8 via the heat-expandable packing 21 on the side surface, and the airtightness is maintained.

As shown in FIGS. 1 and 4, the catalyst container 7 has a structure in which a partition wall 22 that equally divides an internal space of a rectangular tubular frame 24 is welded, and a plurality of filling chambers 25 for the catalyst C are provided. Individually formed. A stopper 26 for fixing the catalyst C is welded to the lower portion of the filling chamber 25, and the catalyst C is filled from the upper portion of the filling chamber 25 to form a catalyst layer. Due to the difference in the coefficient of thermal expansion between the filling chamber 25 and the catalyst C during the warm time of the catalytic converter 1, the gap between the catalyst C and the rectangular cylindrical frame 24 and the partition wall 22 expands. By mounting it between the cylindrical frame 24 and the partition wall 22, it is possible to prevent the exhaust gas from short-circuiting. Also, catalyst C and stopper 26
A cushion member 27 is installed between the catalyst C and the stopper 26 so as not to damage the catalyst C by directly contacting with each other. Then, by appropriately selecting the plate thicknesses of the rectangular tubular frame 24 and the partition wall 22, it is possible to obtain a required strength for holding the catalyst layer.

As shown in FIG. 1, a funnel portion 28 is provided in the lower portion of the rectangular tube-shaped short tube 8.
Is welded, a short pipe 29 that is an exhaust gas outlet 31 is welded to the lower part of the funnel portion 28, and a flange 30 for connecting to the exhaust pipe 32 is welded to the short pipe 29. Thus, the gas from the engine 2 flows into the catalytic converter 1 through the inlet 10, diffuses in the funnel portion 9, enters the catalyst layer from the upper portion, and exits downward. At this time, the harmful components in the exhaust gas are purified by the catalyst C filled in the filling chamber 25, for example, the oxidation catalyst, the reduction catalyst, the three-way catalyst, etc., guided to the funnel portion 28, discharged from the outlet 31 and passed through the silencer 4. Released into the atmosphere.

The monolith catalyst C is supported by the heat-expandable packing 23 and the cushion member 27, and further, the catalyst container 7
Since it is also supported by the heat-expandable packing 21,
Since it will not crack or chip due to vibration, thermal deformation, etc., exhaust gas will not short pass and good catalyst purification performance can be obtained.

The catalytic converter 1 includes the casing body 5, the inspection hole plate 6, and the catalyst container 7, and has a simple structure in which these are integrally assembled, and therefore can be easily manufactured. Further, since the upper and lower flanges 12 and 30 can be easily incorporated into the exhaust system, the exhaust gas discharged from the engine 1 can be purified at a high temperature, so that highly efficient purification action can be performed. .

Although the example in which the exhaust gas enters from the upper portion, is purified, and is exhausted from the lower outlet has been described, the same effect can be obtained even if the exhaust gas flows in the opposite direction. Also,
By changing the mounting angles and shapes of the upper and lower funnel parts 9,28, short pipes 11,29, and flanges 12,30, the exhaust pipes 3,
Can be installed according to 32 installation angles.

Next, another embodiment will be described with reference to FIGS.

In addition to the shape of the catalytic converter for purifying exhaust gas according to the first embodiment, a rail 33 for inserting a receiving plate is provided below the lower desorption rail 19. (Refer to FIGS. 5 and 6) When replacing the catalyst, as shown in FIG. 7, the receiving plate 35 is inserted, and the packing that drops when the catalyst container is pulled out,
It is possible to stop falling objects such as adhered substances on the plate. After replacement of the catalyst, it is protruding from the flange 15 when the catalyst container 7 is inserted, and the inspection hole plate 6 cannot be attached.

[Effect of device]

By making the catalyst container horizontally removable in a pull-out type, and at the time of catalyst replacement, by inserting the receiving plate of the fallen object from the catalyst container into the exhaust pipe,
Work can be performed safely and easily.

Further, the exhaust gas can be efficiently purified with a simple structure.

[Brief description of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
FIG. 3 is an enlarged cross-sectional view of the II part of the figure, FIG. 3 is an explanatory view of a state in which the catalytic converter is incorporated in the engine exhaust system, FIG. 4 is an enlarged explanatory view of the IV-1V arrow part of FIG. 1, and FIG. 6 is an enlarged sectional view of the VI portion of FIG. 5, and FIG. 7 is an explanatory view of a state in which the receiving plate is inserted. 5 ... Casing body, 6 ... Inspection hole plate, 7 ... Catalyst container, 19,20 ... Desorption rail, 33 ... Rail for inserting receiving plate, 35 ... Receiving plate, C ... Monolith type catalyst.

Claims (2)

[Scope of utility model registration request] 1. An exhaust gas purifying converter for purifying gas discharged from an internal combustion engine or the like, and a catalyst container (7) in which a catalyst is set, and an inspection for detaching the catalyst container from a casing body (5). An exhaust gas purifying catalytic converter comprising a perforated plate (6) and a detachable rail (19, 20) for holding the catalyst container in a casing body. 2. A catalyst container (7) below the desorption rail.
The catalytic converter for purifying exhaust gas according to claim 1, further comprising an insertion rail (33) for inserting a receiving plate (35) for receiving parts dropped at the time of replacement.