JP3982775B2 - Exhaust gas purification device for vehicles - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a passenger car, a truck, a motorcycle, etc., which is used by connecting exhaust gas generated by combustion in an engine using fuel such as gasoline and diesel to a rear end portion of an exhaust system for discharging through a muffler. The present invention relates to a vehicle exhaust gas purification device used in various vehicles.
[0002]
[Prior art]
Conventional vehicles purify exhaust gas generated by combustion in an engine through a thermal reactor (unburned gas combustion device), an oxidation catalyst, and a three-way catalyst. For example, HC (hydrocarbon), CO (carbon monoxide), NOX (nitrogen oxide) in the exhaust gas are brought into contact with the catalyst, oxidized and reduced, made CO2, H2O, N2 harmless, and further passed through a muffler The temperature was lowered and expanded.
[0003]
[Problems to be solved by the invention]
However, conventional vehicle purification has not been enough to take in and mix outside air, and has yet to remove harmful substances such as HC, NOX, and CO. The response from the major trend of preventing the ever-increasing global environment from pollution is pressing.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle exhaust gas purifying device that purifies harmful substances released by a vehicle to a higher degree and more simply.
[0006]
[Means for Solving the Problems]
In order to achieve this object, the invention described in claim 1 is a vehicle exhaust gas purification system that is used by being connected to a rear end portion of an exhaust system that discharges exhaust gas generated by combustion in an engine through a muffler. In the apparatus, an outer cylinder having a connecting pipe connected to the exhaust system at one end, the other end being opened, an open side of the outer cylinder being closed, an exhaust gas discharge pipe, and an outside air suction porous A lid having a lid, accommodated in the outer cylinder, forming a mesh-like ventilation portion at one end, and being opened at the other end of the inner cylinder, and having a mesh-like ventilation at both ends. And a catalyst that fills the catalyst filling space. The cylindrical plug is formed with a catalyst filling space between the inner cylinder and the ventilation portion.
[0008]
[Action]
According to the first aspect of the present invention, the exhaust gas that has entered the exhaust gas purification device comes into contact with the catalyst in the catalyst filling space through the connecting pipe, and the purification is facilitated by the catalyst. In the place, the outside air taken in from the outside air intake pores and the exhaust gas are mixed, the temperature is lowered, and oxidation and reduction are promoted to make them harmless.
[0009]
【Example】
The present invention will be described below with reference to the drawings.
[0010]
1 to 3 show an embodiment of the present invention.
[0011]
First, the configuration will be described. In FIG. 3, reference numeral 1 denotes a vehicle on which an engine using fuel such as gasoline or diesel is mounted, and J denotes an exhaust gas purification device for a vehicle. The vehicle exhaust gas purification device J includes an exhaust manifold 3, a front exhaust tube 4, a catalyzer 5, a center exhaust tube 6, a muffler 7, and the like sequentially connected to the engine 2 of the vehicle 1. It is connected to.
[0012]
As shown in FIG. 1, the vehicle exhaust gas purification device J is generally configured with an outer cylinder 10, a lid 20, an inner cylinder 30, and a cylindrical plug 40.
[0013]
The outer cylinder 10 includes a connecting pipe 11 connected to the rear end portion 8 of the exhaust system of the vehicle, and a cylindrical portion 12 connected in communication with the connecting pipe 11. That is, the connecting pipe 11 is provided at one end of the cylindrical portion 12 and the other end is opened. A ring 13 for receiving the inner cylinder 30 is provided on the inner side of the cylindrical portion 12 and closer to the connecting pipe 11. Further, a spiral groove is engraved on the inner peripheral surface of the opened end so that the lid 20 is screwed.
[0014]
The lid 20 includes a lid 21 having a screw portion that can be screwed to an open end of the outer cylinder 10, an exhaust gas discharge pipe 22 that is provided concentrically with the lid 21, and an outside air introduction pipe. 23 and a large number of small holes 24 for introducing the outside air that are arranged in an annular manner in the lid 21 between the discharge pipe 22 and the outside air introduction pipe 23 (see FIG. 2) and are provided therethrough. Yes. The introduction tube 23 has a smaller diameter than the discharge tube 22.
[0015]
The inner cylinder 30 includes a cylindrical part 31 that is shorter than the cylindrical part 12 of the outer cylinder 10 and has a stepped annular member 32 that is fitted into the open part on the connecting pipe 11 side. The stepped annular member 32 is formed of a stepped portion 33 that comes into contact with the ring 13 and a mesh-shaped ventilation portion 34 made of a stainless steel wire mesh or the like. Further, a catalyst filling space 35 for purifying exhaust gas is formed between the inner cylinder 30 and the ventilation portion 31 by mounting a cylindrical plug 40 described later. The catalyst filling space 35 is filled with a suitable catalyst (for example, a ceramic catalyst, a three-way catalyst, etc.).
[0016]
The cylindrical plug 40 includes a cylindrical portion 41 that is open at both ends, and an annular member 42 and a stepped annular member 43 that are fitted at both ends. The annular member 42 has a mesh-shaped ventilation portion 44 having an outer diameter that enters the inside of the cylindrical portion 31 of the inner cylinder 30. The stepped annular member 43 has a small diameter portion that enters the cylindrical portion 31 of the inner cylinder 30, a large diameter step portion 46 that abuts the open end of the inner cylinder 30, and enters the inside of the cylindrical portion 12 of the outer cylinder 10. Thus, a mesh-like ventilation part 45 is provided at the center. These ventilation portions 44 and 45 are made of stainless steel or the like similar to the ventilation portion 34 of the inner cylinder 30. An expansion chamber 47 is formed between the ventilation portions 44 and 45 to expand the purified exhaust gas and mix it with the outside air to promote the oxidation reaction and reduce the temperature. Further, as described above, the cylindrical plug 40 is fitted into the open side of the inner cylinder 30, thereby forming a catalyst filling space 35 between the inner cylinder 30 and the ventilation portion 31.
[0017]
In these components, an inner cylinder 30 is accommodated in the outer cylinder 10, a cylindrical plug 40 is attached to one end of the inner cylinder 30 that is opened, and a lid 20 is opened to the outer cylinder 10. The outer cylinder 10, the lid 20, the inner cylinder 30, and the tubular plug 40 are integrated into the vehicle exhaust gas purification device J (which forms the vehicle exhaust gas purification device 10). It is said.
[0018]
The structure of the vehicle exhaust gas purification device J of the present invention has been described above. Next, the operation of the device will be described.
[0019]
Exhaust gas is purified by combustion of the engine 2 through an exhaust system including an exhaust manifold 3, a front exhaust tube 4, a catalyst 5 filled with a catalyst, a center exhaust tube 6, a muffler 7, a rear exhaust tube 8, and the like. However, removal of harmful substances such as HC, NOX, and CO is not enough depending on the driving conditions. Then, the exhaust gas enters the connecting pipe 11 of the vehicle exhaust gas purifying device J of the present invention attached to the rear end of the exhaust system, passes through the vent portion of the inner cylinder 30, and the ternary of the catalyst filling space 35. The catalyst is contacted with a catalyst such as a catalyst, and the oxidation-reduction action is promoted and purified by the catalyst. Further, the purified exhaust gas enters the tubular plug 40, expands there, and is discharged from the discharge pipe 22 to the atmosphere. When the pressure becomes negative, the exhaust gas is mixed and stirred with the outside air taken in from the outside air introduction hole 24. As a result, oxidation-reduction is promoted in the tubular plug 40, the temperature is further lowered, and the purified exhaust gas is discharged from the exhaust gas discharge pipe 23.
[0020]
Although the present invention has been described with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are included in the present invention. It is. For example, the catalyst is not limited to a ceramic material, and may be a resin material. The material of the device may be stainless steel or a metal having a rust prevention effect.
[0021]
【The invention's effect】
As described above, according to claim 1 and the present invention, the exhaust gas that has entered the exhaust gas purification device contacts the catalyst in the catalyst filling space through the connecting pipe, is purified by the catalyst, In the cylindrical plug, the outside air taken in from the outside air suction hole and the exhaust gas are mixed and stirred, the temperature is lowered, the oxidation-reduction is promoted, and the exhaust gas purified to a higher degree is more easily and easily purified. Therefore, it is possible to provide a vehicle exhaust gas purification device that purifies the harmful substances released by the vehicle to a higher degree and more simply.
[Brief description of the drawings]
1 is a central sectional view of an exhaust gas purifying apparatus for a vehicle showing an embodiment of the present invention. FIG. 2 is a right side view of the exhaust gas purifying apparatus for a vehicle of FIG. It is the schematic of a vehicle provided with a gas purification apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Outer cylinder 11 Connection pipe 20 Lid 21 Lid body 22 Release pipe 23 Outside air introduction pipe 24 Outside air introduction small hole 30 Inner cylinder 31 Cylindrical part 32, 42 Stepped annular member 33, 43 Annular member 34, 44, 45 Ventilation part 35 Catalyst filling space 40 Tubular plug 41 Tubular part

Claims (1)

  In a vehicle exhaust gas purification apparatus used by being connected to a rear end portion of an exhaust system that discharges exhaust gas generated by combustion in an engine through a muffler,
  An outer cylinder having a connecting pipe connected to the exhaust system at one end and formed with a cylindrical portion having the other end opened;
  Closing the open side of the outer cylinder, and a lid having an exhaust gas discharge pipe and a hole for sucking outside air;
  An inner cylinder housed in the outer cylinder, forming a mesh-like ventilation part at one end, and having the other end opened;
  A cylindrical plug that is fitted on the open side of the inner cylinder, has a mesh-like ventilation part at both ends, and forms a catalyst filling space between the ventilation part of the inner cylinder;
  An exhaust gas purifying device for a vehicle comprising a catalyst filling the catalyst filling space.

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