KR20160141150A

KR20160141150A - Insulation for exhaust system with advanced performance in assembly and sound absorption

Info

Publication number: KR20160141150A
Application number: KR1020150075159A
Authority: KR
Inventors: 염교선; 이호진; 홍진기
Original assignee: 동아공업 주식회사
Priority date: 2015-05-28
Filing date: 2015-05-28
Publication date: 2016-12-08

Abstract

The present invention relates to an exhaust system insulation material with improved assemblability and sound absorption. The exhaust system insulation material comprises: a metal cover coupled to an exhaust gas reduction device and an exhaust pipe connected to the exhaust gas reduction device, formed to have a shape surrounding the exhaust gas reduction device, and having an opening formed at a position corresponding to a connection portion of the exhaust pipe; a fiber-shaped high heat resistant sound-absorbing/insulating material attached to an inner surface of the metal cover; and a mesh net disposed between the circumference of the opening unit and an end of the high heat resistant sound-absorbing/insulating material and coupled to the inner surface of the metal cover. The mesh net is extended along the circumference of the opening unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a heat insulation material having improved assembling property and sound absorption property,

More particularly, the present invention relates to the development of environmentally friendly automobiles, in which a heat insulating material is applied to a DPF (diesel particulate filter) and an exhaust pipe of a diesel engine to increase the temperature of the exhaust gas, To an exhaust system heat insulator improved in assembling property and sound absorbing property to improve efficiency.

Generally, a vehicle generally refers to a vehicle or a vehicle that carries a passenger or cargo on the ground by transmitting the power generated by its own engine to the wheel.

Prior to the development of environmentally-friendly vehicles, technologies for significantly increasing engine power and running speed, or increasingly elegant appearance of automobiles were developed.

Recently, due to the depletion of petroleum resources and the global warming caused by greenhouse gases, the need for the development of environmentally friendly automobiles has been greatly increased, and governments are strengthening environmental regulations.

Particularly, the engine structure of an automobile includes a cylinder head provided with a suction valve installed to be opened and closed to a suction port, an exhaust valve provided to be opened and closed to an exhaust port, and an ignition plug for igniting a mixture, An exhaust manifold installed to be connected to the exhaust port of the cylinder head and guiding the exhaust gas to be discharged to the outside, a cylinder block installed in the lower portion of the cylinder head, And a DPF (Diesel Particulate Filter) connected to a fold or exhaust pipe.

The DPF is an exhaust system component that transforms a gasoline-fueled automobile, which was formerly used as a soot mass, in an environmentally friendly manner. It is installed in the exhaust manifold of a diesel engine and reduces the amount of soot through a post-combustion process.

That is, the DPF reduces the exhaust gas by the particulate matter (PM) by the oxidation catalyst, and when the relatively large particulate PM is collected in the filter by a certain amount, the post- As an eco-friendly part that is lifted and released, heat insulation treatment is required to maintain performance.

However, in the process of assembling such a DPF to an exhaust manifold or an exhaust pipe, the processing of the heat insulating material is very complicated, and the assemblability of the DPF to the exhaust manifold or the DPF and the exhaust pipe is very weak However, there is a problem that noise is generated on the connection portion and the heat insulating property is deteriorated.

As described above, the heat insulating material of the exhaust system requires means for improving the assembling property and the sound absorbing property while covering the entire DPF or the connecting portion of the exhaust manifold or the exhaust pipe connected to each other in connection with the DPF. It is a situation where the form and function are urgent.

However, the fibrous high heat-resistance sound absorbing material is widely used as insulation materials such as glass fiber, ceramic fiber, biodegradable bio-fiber and the like, which are currently used. However, the fibrous high- There is a lot of difficulty in assembling to the outer periphery of the connection portion.

In Patent Document 1, which is the background of the invention, only the insulation material applied to the hollow circular pipe is merely referred to. Therefore, by the technology of Patent Document 1, the DPF and the connection portion between the DPF and the exhaust pipe are wrapped around to improve the heat insulation, There is no means to make this possible.

Also, in Patent Document 1, complicated welding is required to wrap the outer periphery of the connection portion of the DPF and the exhaust pipe with the heat insulating material and fix the wrapped heat insulating material with the metal layer or the cover, resulting in very poor assembling performance.

For example, even if the metal layer of Patent Document 1 is manufactured in the form of a heat protector for a vehicle of Patent Document 2, Patent Document 2 simply provides a bend plate having grooves, and therefore, the structure of coupling with the heat insulator, There is no means for fixing the bending plate for the heat protector to the connection portion between the DPF and the exhaust pipe in the state where the DPF and the exhaust pipe are connected.

That is, in the case of the structure of the heat insulating material and the metal layer of Patent Document 1 being applied to the DPF and the structure of the heat insulating material of the vehicle disclosed in Patent Document 2, the heat insulating property, sound absorbing property and assembling property of the connection portion of the exhaust pipe connected to the DPF are generated.

Because the outside of the DPF and the exhaust pipe connected to the DPF can not be welded all over depending on the structure and shape of the engine and the exhaust system of the automobile, the assemblability may be very poor.

In other words, the operator must adhere the heat protector, which is the metal cover, to the heat insulating material at the assembly site, and it is inconvenient to assemble and weld the heat protector to the DPF or the exhaust pipe again.

Particularly, there is a part that is inevitably opened only when the exhaust pipe extends from the DPF, and the loss of the heat insulating material may occur through the open part or the gap.

In addition to this, the assemblability itself is very poor. In addition, the heat insulation and the sound absorption property may be deteriorated due to the loss of the heat insulating material, and the heat protector outside the DPF contacts the exhaust pipe due to the engine vibration.

Further, due to the characteristics of the heat insulating material using glass fiber, ceramic fiber, silica fiber, biodegradable biofibers, etc., it is difficult to assemble a certain shape, so that it is difficult to assemble, and there is a high possibility that the heat insulating material disappears or dust is generated during the assembling process.

In particular, as an environmentally friendly automobile, it is required to develop technology for new materials that can satisfy both assembly efficiency and sound absorption with high efficiency of energy use and minimization of environmental pollution.

[Patent Literature]

(Patent Document 1) Patent Registration No. 10-1134262 (Mar. 30, 2012)

(Patent Document 2) Japanese Laid-Open Patent Publication No. 10-2012-0000636 (2012.01.04)

Accordingly, it is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide a metal cover having a high heat-absorbing sound absorbing material in the form of a fiber and a mesh net coupled along the opening of the metal cover, To provide an exhaust heat insulating material with improved assemblability and sound absorption properties that can prevent the loss of the high heat-absorbing sound insulating material and the leakage of the heat insulating material to the outside, and prevent the metal cover and the outside of the DPF from rubbing due to vibration of the engine do.

It is an object of the present invention to provide an exhaust system thermal insulator which is coupled to an exhaust pipe connected to the exhaust system and connected to the exhaust system. The exhaust system is formed in a shape to surround the exhaust system, The metal cover being formed at a position where it is exposed; A fibrous high heat absorbing sound insulating material adhered to the inner surface of the cover of the metal cover; And a mesh net disposed between the rim of the opening and the end of the high heat-absorbent sound-absorbing material and coupled to the inner surface of the cover of the metal cover, wherein the mesh net extends along the rim of the opening An exhaust-system heat insulating material is provided which is improved in assembling property and sound-absorbing property.

According to the present invention, the metal cover is divided into two portions corresponding to one side portion and the other side portion of the diesel particulate filter, and has a flange portion mutually contacting along the divided boundary, and a plurality of corrugated And the flange portions are welded to each other.

Further, according to the present invention, the high heat-resistant sound absorbing material is formed of any one of glass fiber, ceramic fiber, silica fiber, and biodegradable biofabric.

In addition, according to the present invention, the mesh network may be a woven material obtained by laminating a stainless steel wire or a metal thin wire in a net form and then stacking the metal wire, a three-dimensional Kagome wire made of a stainless steel material or a wire made of a high- kagome truss assembly and WBK (Wire Woven Bulk Kagome), and is thinner than the high heat-resistant sound absorbing material.

Also, according to the present invention, the particulate matter reduction apparatus may be a DPF (Diesel Particulate Filter).

According to the present invention, the metal cover further includes: a main plate portion formed at one end of the flange portion and stacked on the outer surface of the high heat-resistant sound-absorbing material; A bending plate portion having a groove cross-sectional shape integrally formed at the other end of the main plate portion opposite to the one end for the end finishing of the high heat-resistant sound absorbing material; And a mesh mount part integrally formed at an end of the bent plate part and forming a groove cross-sectional shape in a direction opposite to the groove cross-sectional shape, wherein the mesh mesh is inserted.

According to the present invention, the metal cover is composed of an outer cover layer and an inner cover layer, and the high heat-resistant sound absorbing material is interposed between the outer cover layer and the inner cover layer, And portions where the inner cover layers are connected to each other are welded.

Further, according to the present invention, the outer cover layer may include: a body outer surface portion laminated on an outer surface of the high heat-resistant sound absorbing material; A bending outer surface portion of a groove cross-sectional shape integrally formed at an end of a surface portion of the body for finishing the end of the high heat-resistant sound absorbing material; And a mesh resting outer surface portion integrally formed at an end of the bent outer surface portion and forming a groove cross-sectional shape in a direction opposite to the groove cross-sectional shape.

Further, according to the present invention, the inner cover layer is in contact with the inner surface of the high heat-resistant sound-absorbing material and extends to the inflection point of the groove cross-sectional shape of the outer surface portion of the folding, And a groove section shape having a relatively small size as compared with a groove cross-sectional shape of the mesh seating outer surface portion so as to be inserted and laminated on the mesh seating outer surface portion, wherein the groove is bent at an end of the inner surface portion, And a rim on which the inner cover layer and the outer cover layer are connected to each other are welded to each other.

In addition, according to the present invention, the metal cover may include: an embossed portion formed on the outer cover layer; And an air layer formed between the inner surface of the outer cover layer and the surface of the high heat-resistant sound-absorbing material to the inside of the embossed portion.

The exhaust heat insulating material improved in the assembling property and the sound absorbing property of the present invention by the above-mentioned problem solving means is characterized in that a metal cover of a thin plate material and a fibrous high heat absorbing sound absorbing material are integrally combined, Since the combined product is formed in a shape corresponding to the shape of the entire DPF and the shape of the connecting portion of the exhaust pipe connected thereto, the one-side combined product and the other combined product are arranged to surround the connecting portion of the DPF and the exhaust pipe, There is an advantage in that it can be easily assembled such as in a manner that is connected by joining (e.g. welding).

Further, in the present invention, since the mesh net extends along the rim of the opening of the metal cover and is incorporated in the metal cover in any one of the ring shape, the semicircular ring shape, the arc shape, and the polygonal curved shape, So that the vibration of the mesh net can be minimized while the metal cover is not directly brought into contact with the surface of the DPF or the surface of the exhaust pipe, There is an advantage that can be made.

In addition, the present invention may further include a net rest portion formed along the rim of the opening of the metal cover, and the mesh net is coupled to the net rest portion so that the mesh net is not physically separated from the metal cover.

Further, the present invention is characterized in that the metal cover comprises an outer cover layer and an inner cover layer, a high heat-absorbing sound insulating material is interposed between the outer cover layer and the inner cover layer, and the outer cover layer and the inner cover layer And the surface and the inner surface are all enclosed. Thus, it is possible to prevent the occurrence of the loss or dust of the high heat-resistant sound-absorbing material.

Further, the present invention is characterized in that an embossed portion is further formed on the outer cover layer of the metal cover, and an air layer is further formed on the inner side of the embossed portion between the inner surface of the outer cover layer and the surface of the high heat- Can be further increased.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an exhaust system heat insulator with improved assembling and sound-absorbing properties according to a first embodiment of the present invention; FIG.
2 is a sectional view of line AA shown in Fig.
3 is an exploded cross-sectional view of an exhaust system thermal insulator with improved assembling and sound-absorbing properties according to a second embodiment of the present invention;
Fig. 4 is an assembled sectional view of the heat insulating material shown in Fig. 3; Fig.
5 is an enlarged and separated sectional view of an exhaust system thermal insulator improved in assembling and sound absorption according to a third embodiment of the present invention.
Fig. 6 is an enlarged engaging sectional view of the heat insulating material shown in Fig. 5; Fig.
7 is an enlarged cross-sectional view of an exhaust system heat insulator improved in assemblability and sound absorption according to a fourth embodiment of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It should be understood that various equivalents and modifications may be present.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First Embodiment

FIG. 1 is a perspective view of an exhaust system heat insulator improved in assemblability and sound absorption according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line A-A shown in FIG.

Referring to FIG. 1, the heat insulating material according to the first embodiment may be an exhaust heat insulating material coupled to an exhaust pipe connected to the soot reducing device and the exhaust gas reducing device. Here, the soot reduction apparatus may be a DPF (Diesel Particulate Filter).

To this end, the heat insulating material according to the first embodiment provides a metal cover 100 which can be welded and assembled with a smoke eliminating device (for example, a DPF) of various standards or an exhaust pipe for a smoke reducing device according to the standard.

The metal cover 100 may be made of a metal material capable of withstanding the temperature of the diesel particulate filter and minimizing the deformation of the cover, or may further include a paint layer or a coating layer of a heat dissipating material.

Since the metal cover 100 is made up of a pair of left and right (101, 102), it is excellent in assembling property and is divided into two parts corresponding to one side and the other side of the corresponding soot abatement device and welded to each other, And is formed in a shape that can cover the connection portion of the exhaust pipe to be connected to the soot reduction apparatus.

Particularly, the metal cover 100 itself can not be welded over the entire area due to the shape of the exhaust gas purifying device or the exhaust pipe, and there may be a part that is inevitably opened.

For example, there are various shapes or numbers of openings 103, 104, 105, 106, 107 in the metal cover 100.

That is, the metal cover 100 is formed so as to surround the dust removing device. In addition, the openings 103, 104, 105, 106 and 107 are formed in the metal cover 100 in correspondence with the position corresponding to the connection portion of the exhaust pipe or the corresponding device connected to the diesel particulate removing device.

1 or 2, the first embodiment is previously attached to the metal cover 100 constituting the outer periphery of the soot abatement device Q, and has a shape corresponding to the inner shape of the metal cover 100 Heat insulating sound absorbing material 200 and mesh net 300. The heat insulating performance, the sound absorbing performance, or the sound insulating performance can be exhibited.

At this time, the metal cover 100, the high heat-resistant sound absorbing material 200, and the mesh net 300 have a structure or an integral structure joined by welding or welding.

In addition, the metal cover 100 has a plurality of pleated protrusions 108 formed on the outer surface of the cover.

The corrugated protrusions 108 can increase the bending structure stiffness of the metal cover 100 and thereby increase the durability or structural rigidity of the metal cover 100 itself.

The metal cover 100 has flange portions 109 that are mutually contacted or bent along a bisected boundary. Here, the flange portion 109 is formed along the rim of the pair of left and right (101, 102) of the metal cover 100, and can be coupled to each other by welding in face-to-face or overlapping.

In the first embodiment, the function of preventing the loss or loss of the high-heat-absorbing sound-absorbing material 200 or the function of preventing the sound-absorbing performance from being deteriorated in the openings 103 and 106 corresponding to the portions where the welding is extremely difficult or impossible, And a mesh network 300 that functions to improve or improve the network performance.

The high heat-resistant sound absorbing material 200 may be any one of glass fiber, ceramic fiber, silica fiber, and biodegradable bio-fiber.

The high heat-resistant sound absorbing material 200 may be attached to the inner surface of the cover of the metal cover 100 through an adhesive or the like.

The high heat-resistant sound absorbing material 200 may have a thickness that is relatively thicker than the thickness of the mesh net 300 considering the compressibility of the fibrous material during installation.

The mesh net 300 is adhered to the side of the soot reduction apparatus Q while being attached to the inner surface of the metal cover 100 around the openings 103 and.

The mesh net 300 located inside the openings 103 and 106 fills a gap between the metal cover 100 and the smoke removal device Q so that the high heat absorbing sound absorbing material 200 escapes through the openings 103 and 106 Heat absorptive sound absorber 200 and dust that can be generated in the high heat-resistant sound-absorbing material 200 are prevented from flowing out to the outside of the metal cover 100, and at the same time, It is possible to prevent a frictional sound between the cover 100 and the smokestack reducer Q. [

In addition, the mesh net 300 may play a role of minimizing the welding process between the metal cover 100 and the dust removing apparatus Q.

The mesh net 300 is disposed between the rim of the openings 103 and 106 and the end of the high heat-resistant sound absorbing material 200 and is coupled to the inner surface of the cover of the metal cover 100.

For example, the mesh net 300 may be attached to the inner surface of the cover of the metal cover 100 through an adhesive or welding.

The mesh net 300 may extend along the rim of the openings 103 and 106 and may have any one of a ring shape, a semicircular ring shape, an arc shape, and a polygonal curved shape.

The mesh net 300 may be a woven fabric in which a stainless steel wire or a metal thin wire is woven together in a net form and then laminated and increased in thickness.

Alternatively, the mesh net 300 may be a three-dimensional kagome truss aggregate or WBK (Wire Woven Bulk Kagome) formed by three-axis weaving a wire made of a stainless steel material or a high heat resistant metal alloy material so that light- As shown in FIG.

The mesh net 300 can absorb or block vibrations and noise due to its porous properties. Further, the mesh net 300 may have a thickness smaller than that of the high heat-resistant sound absorbing material 200.

The first embodiment is manufactured in such a state that the high-heat-absorbing sound absorbing material 200 and the mesh net 300 incorporated in the metal cover 100 are in a state of being divided, and then the exhaust system or the smoke elimination device Q is wrapped So that the assemblability of the metal cover 100 and the high heat-resistant sound absorbing material 200 are separately improved in comparison with the conventional method of installing the metal cover 100 and the high heat-absorbing sound insulating material 200 in the exhaust system or the exhaust gas quenching device Q, do.

In addition, since the mesh net 300 plays the role of a stopper or a restricting member for preventing external leakage to the high heat-resistant sound absorbing material 200 while absorbing vibration and noise, it is possible to prevent the high- It is possible to prevent the outflow of dust.

In the first embodiment, not only the openings 103 and 106 but also the mesh network 300 may be installed in other openings 104, 105 and 107 in the same structure and manner to perform the same function and role.

Second Embodiment

The exhaust assemblies of the present invention having improved assemblability and sound absorption properties as described in this embodiment can be the same as or very similar to those of the first embodiment except that the metal cover includes the main plate portion, the bent plate portion, and the mesh seating portion. Therefore, the same or corresponding elements in FIGS. 1 to 4 will be given the same or similar reference numerals, and a description thereof will be omitted here.

FIG. 3 is an exploded cross-sectional view of an exhaust system thermal insulator improved in assembling property and sound absorption according to a second embodiment of the present invention, and FIG. 4 is an assembled cross-sectional view of the heat insulating material shown in FIG.

3 and 4, the second embodiment differs from the second embodiment in that the attachment position of the mesh network 300 itself is changed by thermal load or impact, or the mesh network 300 is not separated from the metal cover 100a .

In the second embodiment and the following embodiments, detailed description is made using only one of the pairs of metal covers 100a in order to avoid ease of description and redundant description.

The metal cover 100a according to the second embodiment includes a main plate portion 111 having a flange portion 109 formed at one end.

Here, the main plate portion 111 is formed in a shape corresponding to the outer periphery of the soot reduction device or in a shape that surrounds a part of the soot reduction device, or is formed by sheet metal processing.

The main plate portion 111 is laminated on the outer surface of the high heat-resistant sound absorbing material 200. Of course, an adhesive layer is formed between the inner surface of the main plate portion 111 and the outer surface of the high heat-resistant sound absorbing material 200, so that mutual adhesion is possible.

The metallic cover 100a is integrally formed at the other end of the main plate portion 111 corresponding to the opposite side of the one end of the main plate portion 111 for finishing the end of the high heat- And includes a bent plate portion 112 having a groove sectional shape.

At this time, the groove depth of the bent plate portion 112 having the groove cross-sectional shape may be set to a size smaller than the thickness of the high heat-resistant sound absorbing material 200, or in particular, so as not to contact the surface of the smoke-

Further, the bent plate portion 112 can also perform a buffering action against vibration by its bent shape.

The metal cover 100a is integrally formed at the end of the bent plate portion 112 and has a groove cross-sectional shape in a direction opposite to the groove cross-sectional shape. (113).

The mesh mount part 113 plays a role of serving as a stopper to physically prevent the mesh mesh 300 from horizontally moving due to its shape characteristic or plays a role of increasing a bonding surface area so that the mesh mesh 300 can be stably So that it can be attached or bonded to the metal cover 100a with high quality and high quality.

The mesh net 300 may be positioned at an open portion of the high heat-absorbing sound-absorbing material 200 or the metal cover 100a or at a portion of the high-heat-absorbing sound absorbing material 200 or the dust- It can serve as a stopper to prevent the pressure from being compressed.

Third Embodiment

The exhaust system heat insulation material improved in assembling property and sound absorption property of the present invention described in this embodiment is the same as the second embodiment except that the high heat-resistance sound absorbing material is isolated by the outer cover layer and the inner cover layer of the metal cover Or very similar. Therefore, the same or corresponding components in FIGS. 1 to 6 will be given the same or similar reference numerals, and a description thereof will be omitted here.

FIG. 5 is an enlarged cross-sectional view of an exhaust system heat insulator improved in assembling property and sound absorption according to a third embodiment of the present invention, and FIG. 6 is an enlarged cross-sectional view of the heat insulating material shown in FIG.

5 and 6, the metal cover 100b includes an outer cover layer 120 and an inner cover layer 130, and has a double cover structure or a sandwich structure.

Here, the outer cover layer 120 and the inner cover layer 130 are metal thin plates of the same or different quality, which can be engaged with each other through a molding or sheet metal manufacturing process, So that a space can be formed.

That is, the high heat-resistant sound absorbing material 200 is interposed between the outer cover layer 120 and the inner cover layer 130 through assembly. Since the outer cover layer 120 and the inner cover layer 130 are welded to each other, the outer cover layer 120 and the inner cover layer 130 are connected to each other. A structure that is enclosed in a closed state or an isolation state can be achieved.

To this end, the outer cover layer 120 includes a body outer surface portion 121 laminated on the outer surface of the high heat-resistant sound absorbing material 200, 121, and a bent outer surface portion 122 integrally formed at an end of the bent outer surface portion 122 and having a groove cross-sectional shape in a direction opposite to the groove cross-sectional shape And a net resting outer surface portion 123 which forms a net.

The inner cover layer 130 laminated on the outer cover layer 120 is in close contact with the inner surface of the high heat-resistant sound absorbing material 200 and the inflection point of the groove cross- 124 extending from the inner surface portion 131 of the body.

Here, the body inner surface portion 131 extends parallel to the bending outer surface portion 122 while maintaining a distance corresponding to the thickness of the high heat-resistance sound absorbing material 200.

The inner cover layer 130 is bent at the end of the inner surface portion 131 of the body so as to be in close contact with the folded outer surface portion 122 and is inserted into the net surface 123, And a mesh resting inner surface portion 132 having a groove cross-sectional shape having a size relatively smaller than the groove cross-sectional shape of the seating outer surface portion 123.

Of course, any one of the body outer surface portion 121, the folded outer surface portion 122, and the net rest surface portion 123 of the outer cover layer 120 may be bonded to the inner surface portion of the inner cover layer 130 131 or the mesh seating inner surface portion 132 are welded to each other.

Fourth Embodiment

The exhaust assemblies of the present invention having improved assemblability and sound absorption described in this embodiment may be the same as or very similar to those of the third embodiment except that they further include an embossing portion and an air layer. Therefore, the same or corresponding elements in FIGS. 1 to 7 will be given the same or similar reference numerals, and a description thereof will be omitted here.

The metal cover 100c includes an embossed portion 125 formed in the outer cover layer 120. [ The embossed portion 125 may be formed on the outer surface of the body of the outer cover layer 120 in an equally spaced or irregular arrangement structure through sheet metal working or molding.

Since the outer portion of the metal cover 100c is made of the embossed portion 125, it is possible to facilitate the processing of the bent shape. As a result, the exhaust system thermal insulation material of the fourth embodiment composed of the metal cover 100c, the high heat-resistant sound absorbing material 200 and the mesh net 300 has a high quality that can be combined to airtightly enclose the smoke control device.

In particular, the operator or the assembling apparatus (not shown) can assemble the metal cover 100c and the high-temperature-absorptive sound-absorbing material 200 while adjusting the filling amount or the amount of the high-heat-absorbing sound-absorbing material 200. As a result, An air layer 126 formed between the inner surface of the outer cover layer 120 and the surface of the high heat-absorbent sound-absorbing material 200 may be formed on the inner side of the inner cover 125.

Here, the outer cover layer 120 and the inner cover layer 130 connected to each other do not allow the outside air to enter the inside of the metal cover 100c.

Therefore, the air layer 126 inside the metal cover 100c exerts a heat insulating function formed on the upper side of the high heat-resistant sound-absorbing material 200 that keeps the isolated state, The heat insulating performance can be maximized and improved.

Q: Smoke reduction device 100, 100a, 100b, 100c: metal cover
120: outer cover layer 130: inner cover layer
125: embossing portion 126: air layer
200: High heat-resistant sound absorbing material 300: Mesh mesh

Claims

An exhaust-system thermal insulator coupled to an exhaust pipe connected to the exhaust-gas abatement device and the exhaust-gas abatement device,
A metal cover which is formed in a shape that surrounds the dust removing device and has an opening formed at a position corresponding to a connecting portion of the exhaust pipe;
A fibrous high heat absorbing sound insulating material adhered to the inner surface of the cover of the metal cover; And
And a mesh net disposed between the rim of the opening and the end of the high heat-absorbent sound-absorbing material and coupled to an inner surface of the cover of the metal cover,
Wherein the mesh net extends along the rim of the opening. &Lt; RTI ID = 0.0 > 11. < / RTI >

The method according to claim 1,
Wherein the metal cover is divided into two portions corresponding to one side portion and the other side portion of the diesel particulate filter and has a flange portion that contacts each other along a bisected boundary and a plurality of pleated protrusions are formed on the outer surface of the cover, And the flange portions are welded to each other. &Lt; RTI ID = 0.0 > 11. < / RTI >

The method according to claim 1,
Wherein the high heat-resistant sound absorbing material is formed of any one of glass fiber, ceramic fiber, silica fiber, and biodegradable bio-fiber.

The method according to claim 1,
The mesh network may be a three-dimensional kagome truss assembly formed by weaving stainless steel wires or thin metal wires in a net shape and then woven with a woven material having increased thickness, stainless steel material or high heat resistant metal alloy material, and WBK Wire Woven Bulk Kagome, and has a thickness thinner than that of the high heat-resistant sound absorbing material.

The method according to claim 1,
Wherein the particulate reduction device is a DPF (Diesel Particulate Filter).

3. The method of claim 2,
The metal cover
A main plate portion formed at one end of the flange portion and stacked on an outer surface of the high heat-resistant sound-absorbing material;
A bending plate portion having a groove cross-sectional shape integrally formed at the other end of the main plate portion opposite to the one end for the end finishing of the high heat-resistant sound absorbing material; And
And a mesh seating part formed integrally with an end of the bent plate part and forming a groove cross-sectional shape in a direction opposite to the groove cross-sectional shape, wherein the mesh netting is inserted. Exhaust system insulation.

The method according to claim 6,
Wherein the metal cover is composed of an outer cover layer and an inner cover layer, the high heat-resistant sound absorbing material is interposed between the outer cover layer and the inner cover layer, Is welded to the outer surface of the heat insulating member.

8. The method of claim 7,
The outer cover layer
A main body outer surface portion laminated on an outer surface of the high heat-resistant sound absorbing material;
A bending outer surface portion of a groove cross-sectional shape integrally formed at an end of a surface portion of the body for finishing the end of the high heat-resistant sound absorbing material; And
And a mesh resting outer surface portion integrally formed at an end of the outer surface of the bent portion and having a groove cross-sectional shape in a direction opposite to the groove cross-sectional shape, wherein the mesh resting outer surface portion is improved in assemblability and sound absorption.

9. The method of claim 8,
The inner cover layer
A main body inner surface portion which is in close contact with the inner surface of the high heat-resistant sound absorbing material and extends to an inflection point of the groove cross-sectional shape of the outer surface portion of the bending; And
A groove cross-sectional shape that is bent at an end of the inner surface portion of the body so as to be in close contact with the outer surface of the bent portion and is relatively small in comparison with the groove cross-sectional shape of the net rest surface, And an inner surface of the net,
And the rims at which the inner cover layer and the outer cover layer are connected to each other are welded to each other.

10. The method of claim 9,
The metal cover
An embossing portion formed on the outer cover layer; And
And an air layer formed between the inner surface of the outer cover layer and the surface of the high heat-absorbent sound-absorbing material to the inside of the embossed portion.