JP4571653B2 - Car muffler - Google Patents

Description

The present invention, deodorization, particulate matter such as removal, relates to an automotive muffler you remove harmful components in the combustion gas.

Patent Document 1 describes a heat insulating material obtained by mixing pulverized garnet and an inorganic binder mainly composed of sodium silicate and potassium silicate, filling the mold, firing, foaming and molding. Yes. FIG. 11 is a perspective view showing a plate-like heat insulating material described in Patent Document 1, wherein 1 is the above-described molded board, and 2a and 2b are two surface materials sandwiching the board.
The board manufactured in this manner not only has excellent heat insulation and fire resistance, but also has a large internal gap and excellent air permeability. Although it has been suggested to use the board as a filter or as a catalyst carrier in a reaction tower, no specific proposal has been made for these uses.
JP 2004-69060 A

The present invention uses the board as a filter, deodorizing, and to realize particulate matter such as removal, the automobile muffler you remove harmful components in the combustion gas.

This onset Ming, plate material porous and a ground garnet and inorganic binder as materials, the interior of the cylindrical body passing through the combustion gases from one end to the other, the combustion gases are arranged to transmit In a muffler for an automobile, a front plate with a hole is disposed upstream of the plate material in the flow direction of the combustion gas inside the cylindrical body, and shock waves propagated to the cylindrical body are received by the front plate. In order to relax, a predetermined space is provided between the front plate and the plate.
As described in claim 2, the plate material in the present invention may be formed with a plurality of through-holes that are larger than a void having a porous structure of the plate material and have a smaller resistance than the void.
In the present invention, as are set forth in claim 3, wherein the plate member, along with the encased by a surface material, opening the entrance of the combustion gases on the surface material may be formed.

According to the present invention, lightweight and realized cheap yet muffler automotive cost, it exhibits the excellent effect that greatly contributes to environmental preservation.

The basic component of the present invention is a plate material obtained by mixing, compressing and firing pulverized garnet, an inorganic binder, and, if necessary, further added clay. Garnet is an easily available raw material that is abundantly produced in Japan. Moreover, since what grind | pulverized the ground garnet and made it foam is marketed for agriculture by the name of "perlite", when using this , the 1st baking and foaming process can be skipped. The inorganic binder is mainly composed of caustic soda, sodium silicate, potassium silicate and the like. If the inorganic binder alone does not provide sufficient bonding strength, add a small amount of clay. Water is added to and mixed with these raw materials, filled in a mold while applying vibration, preheated (dried), and then fired at 600 to 1050 ° C., which is the melting temperature of garnet. Since the obtained plate material can be easily machined, it is allowed to cool to room temperature, and then, if necessary, the surface, surroundings, etc. are cut or cut to a predetermined size.

Since this plate material has a structure in which foamed garnet particles are fused, it has continuous voids inside, and has a large surface area in contact with gas, so it is excellent as a filter.
Furthermore, the deodorizing function can be further increased by impregnating with various catalysts in advance.
Further, by wrapping the plate material with the surface material, peeling or damage of the plate material surface can be prevented, and by providing an opening in the surface material, a flow path for controlling gas permeation can be configured. When the plate material is used directly without using the surface material, the edge portion can be prevented from cracking and powdering by brushing water glass, an inorganic solvent, or the like on the periphery.

  If there is resistance to the passage of gas with only the gaps in the plate material, a plurality of through holes may be formed in the plate material itself.

A panel body P that can be used in the first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a panel body P, FIG. 2 is also a sectional view, and 1 is a mixture of pulverized garnet, an inorganic binder, and a small amount of clay, filled in a mold, compressed, fired and foamed. , Plate material 4, 4 is a partition material, 3 is a surface material that wraps two plate materials 1 and 1 that are overlapped with the partition material 4, and 31, 32, and 41 are the surface material 3 and the partition material 4 is an opening. For example, the boards 1a and 1b have a rectangular shape with a planar shape of 600 × 900 mm and a thickness of 40 mm. Accordingly, the dimensions of the panel body P are substantially the same in plan view, and the thickness is 80 mm + three plate thicknesses. The surface material 3 and the partition material 4 are a metal plate or a resin plate. In the case of a metal plate, it is desirable to use a stainless steel plate, or to be resistant to corrosion such as plating or heavy coating.

  The openings 31 and 32 of the surface material 3 serving as gas inlets and outlets are provided on the front and back sides of the panel body P. The opening 41 of the partition member 4 is preferably located as far as possible from the openings 31 and 32 of the surface material 3. As a result, the gas internal path can be made longer, but in some cases, the boards may be directly stacked without the partition material 4 being sandwiched, or a thick board may be used. In any case, it is desirable that the gas that has entered the panel body P pass through the interior as long as possible.

If the usage example of said panel body P is shown as a reference, FIG. 3 is sectional drawing which shows an example of the gas purification unit U which uses this panel body P, 6 is a cylinder, 7 is an air blower. The cross-section of the cylindrical body 6 is a planar shape of the panel body P or a shape in which a plurality of these are laid out side by side. Even when a plurality of panels are laid out, the opening of the surface material 3 that serves as the gas inlet and outlet is required for each panel body P, but these are arranged at positions corresponding to the side surfaces between the adjacent panel bodies P. There is a need.

  And the inside of the cylinder 6 arrange | positions the said panel body P or what laid this on the plane one or more steps | paragraphs in the length direction of the said cylinder 6, and comprises the basic gas cleaner. If this cylinder 6 is set vertically and installed on the roof, and the blower 7 is attached to either the top or bottom of the cylinder, the roof-mounted gas cleaning unit U is completed. The blower 7 is a push-in type when attached to the lower surface of the cylindrical body 6 and a suction type when attached to the upper surface. It is desirable that the panel body P take into account the mutual distance and the position of the opening so that the air flows through the panel body for a long time and the resistance as a whole decreases. When a sufficient air volume can be obtained by natural ventilation, the blower 7 is not particularly required.

  For example, assume that there is a building 8 as shown in FIG. 81 is a roof for natural ventilation, 82 is a large roof, and 83 is a building including walls and foundations. Due to natural ventilation by convection, ambient air is sucked from the side surface of the building 83 and exhausted from the louver on the side surface of the rooftop 81. However, if this building 8 is, for example, a barn, a pig house, a poultry house, the odor generated inside is diffused to the surroundings, which is not preferable for environmental management.

  FIG. 4 is a partial front view of the building 8 showing the case where the gas cleaning unit U is incorporated into the interior of the rooftop 81 in FIG. In some cases, the gas cleaning unit U may be mounted on the roof 81 of FIG. Since only the air deodorized through the inside of the panel body P is diffused, the surrounding environment is improved.

A second embodiment of the present invention will be described with reference to the drawings. Figure 5 is an oblique view of an automotive muffler according to the present invention, FIG. 6 is a cross-sectional view. The cylindrical body 6 has a cylindrical shape, and the panel body P has a disk shape corresponding to this. As indicated by the arrows, the combustion gas passes from one end of the cylindrical body 6 to the other end, and is purified and discharged by passing through the panel body P during this period. Although it is well known that various catalysts are effective for purifying carbon monoxide and hydrocarbons in exhaust gas, removing particulate matter, etc., the panel body P of the present invention has a porous internal plate material. It is easy to impregnate the catalyst.

  As an example of dimensions, the inner diameter of the cylinder 6 is 240 mm, and the length of the cylinder is 450 mm. As the muffler, it is optional to provide a cover plate, a funnel tube, a perforated tube or the like inside the cylindrical body 6 other than the illustrated one.

  An automobile muffler according to a third embodiment of the present invention will be described with reference to the drawings. 7 is a perspective view, and FIG. 8 is a cross-sectional view. The cylindrical body 6 has a rectangular tube shape, and the plate member 1 has an octagonal shape corresponding to this. 61 is a front plate having a plurality of holes, 62 is a back cover plate, between which the combustion gas passes from one end to the other end of the cylinder 6 as indicated by an arrow, and permeates the plate 1 between them. Is purified and discharged. Instead of the front plate 61, the plate material 1, and the cover plate 62, the panel body P of the present invention may be used as in the second embodiment.

  An automobile muffler according to a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 9 is a sectional view. Although the configuration is almost the same as that of the third embodiment, a plurality of through holes are provided in the plate member 1 to cope with a high output engine. For the sake of distinction from the plate material 1 having no through hole, this is called a board 1a for convenience. FIG. 10 is a front view of the front plate 61 used in the third and fourth embodiments. A plurality of holes are provided in the front plate, and notches are also formed in the peripheral edge portion. Thereby, removal (cleaning) of the particulate matter trapped inside becomes easy. The material of the front plate 61 is, for example, a stainless steel plate because it is resistant to corrosion, but may be a ceramic or a resin plate.

Further, it is preferable to dispose the front plate 61 a little away from the plate material 1 for the purpose of mitigating strong shock waves from the engine by receiving it from the front plate 61 and preventing damage to the rear plate material 1.
The automobile muffler shown in Example 4 was mounted on an operating Hino PB-XZU421M type truck, and a 13-mode test was performed by the chassis dynamometer method at the Japan Automobile Transport Technology Association to measure exhaust gas.

The measured exhaust gas components are particulate matter 0.112 (0.350), nitrogen oxide 3.897 (4.220),
Hydrocarbon 0.512 (1.470), Carbon monoxide 2.416 (3.460) Carbon dioxide 868.7 (None) (Unit: g / kWh, () is the regulation value in 2003, and all items are below the regulation value and passed. It was judged.

It is a perspective view showing a panel which can be used in the present invention embodiment. It is a sectional view showing a panel which can be used in the present invention embodiment. It is a sectional view showing a gas-member cleaning unit as an example use of the panel body. It is a partial front view of the building, which was installed the gas-body cleaning unit. It is a perspective view which shows the muffler for motor vehicles of the 2nd Example of this invention. It is sectional drawing which shows the muffler for motor vehicles of the 2nd Example of this invention. It is a perspective view which shows the muffler for motor vehicles of the 3rd Example of this invention. It is sectional drawing which shows the muffler for motor vehicles of the 3rd Example of this invention. It is sectional drawing which shows the muffler for motor vehicles of the 4th Example of this invention. It is a front view which shows the front board in the muffler for motor vehicles of the 3rd, 4th Example of this invention. It is a perspective view of the heat insulating material in a prior art. It is a front view of a traditional building.

Explanation of symbols

1 board
1a board
2a, 2b, 3 Surface material 4 Partition material 6 Cylindrical body 7 Blower 8 Building
31, 32, 41 opening
61 Front plate
62 Covering board
81 rooftop
82 Large roof
83 Building P Panel body U Gas cleaning unit

Claims (3)

In an automobile muffler in which a porous plate material containing pulverized garnet and an inorganic binder as a raw material is disposed so that the combustion gas permeates through a cylinder through which the combustion gas passes from one end to the other end.
A front plate having a hole in the cylinder in the flow direction of the combustion gas upstream of the plate material is disposed, and the shock wave propagated to the cylinder is received by the front plate and relaxed. A muffler for an automobile, wherein a predetermined interval is provided between a front plate and the plate member.   The automobile muffler according to claim 1, wherein the plate material is formed with a plurality of through-holes that are larger than a void having a porous structure of the plate material and have a smaller resistance than the void.   3. The automobile muffler according to claim 1, wherein the plate material is wrapped with a surface material, and an opening serving as an inlet / outlet of the combustion gas is formed in the surface material. 4.

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