KR101997157B1 - A vehicle exhaust pipe including an inorganic binder - Google Patents

Abstract

The present invention relates to a vehicle insulating exhaust pipe including an inorganic binder having high heat resistance and durability by mixing the inorganic binder strong to heat and an insulating material. The present invention provides a vehicle insulating exhaust pipe which comprises: (a) a metal exhaust pipe connected and mounted between an exhaust manifold and an after-treatment device of an engine; (b) a glass wool layer formed to surround an external side of the exhaust pipe, wherein an inorganic binder is immersed therein; and (c) an exterior cover of a metal thin plate material to surround and protect an outer circumferential surface of the glass wool layer.

Description

[0001] The present invention relates to an automobile exhaust pipe including an inorganic binder,

More particularly, the present invention relates to an automobile exhaust pipe having high heat resistance and durability by mixing an inorganic binder resistant to heat with a heat insulating material.

Generally, in an internal combustion engine (engine) that generates power of a medium-sized commercial vehicle such as a truck or a bus, a large amount of harmful particulates is discharged when the fuel is burned. The fuel injected from the internal combustion engine for a vehicle, A large amount of noxious gas (soot) such as various particulate matter due to incomplete combustion, nitrogen oxides, unburned hydrocarbons, carbon monoxide and the like is generated in the process of self-ignition and combustion. In the combustion process of the internal combustion engine as described above, The harmful gas (soot) is discharged to the atmosphere through a muffler through an exhaust pipe and a manifold through which a plurality of branch pipes connected to the engine are combined into one, and the air is polluted, Lung cancer, and the like.

For this reason, a vehicle using CNG or diesel fuel is equipped with a pretreatment device for reducing exhaust of harmful gas from the engine itself before the exhaust gas is discharged to the outside in order to prevent pollution, and exhaust gas As a post-treatment device, various kinds of soot reduction devices are connected to the pipe to maximize the purification efficiency of the harmful gas in the exhaust gas. The soot reduction device includes a diesel particulate filter (DPF) and a diesel oxidation (DOC) and selective catalytic reduction (SCR). The DPF is an apparatus for collecting particulate matter (PM) and burning and removing the particulate matter (PM) The diesel oxidation catalytic device (DOC) can remove hydrocarbons, carbon monoxide, The selective denitration catalyst unit (SCR) uses an urea solution supplied from a separate urea solution supply unit as an oxidizing agent to remove nitrogen oxides Is reduced.

However, in the related art, the exhaust pipe connected to the exhaust pipe of the engine is designed to be independent of the heat loss, so that the heat of the exhaust gas is lost during the process of passing through the exhaust pipe, There is a problem that the efficiency of the exhaust gas purification treatment in the post-treatment apparatus is greatly reduced.

As a conventional technique for lowering the heat loss of the exhaust pipe as described above, Korean Unexamined Utility Model Publication No. 20-1998-046732 discloses a method in which glass fiber on the surface of an exhaust pipe is coated, an aluminum plate is coated, and then coated with a silicone emulsion However, the above-mentioned prior art is used for lowering the internal temperature of the engine room, which is installed in the engine room. It is applied only to one layer of general glass fiber on the surface of the exhaust pipe, When the exhaust pipe of the prior art is installed between the engine and the after-treatment apparatus, the outer surface of the exhaust pipe is exposed to the outside of the lower portion of the vehicle, ) Silicone emulsion of one material is easily torn or damaged when driving There is a problem that the heat insulation efficiency is rapidly deteriorated within a short time.

Korean Patent No. 10-1298151 discloses a method of inspecting an exhaust pipe using glass wool. However, due to the use of an organic binder, the thermal durability is poor. In order to reinforce this, the glass wool is doubled .

The present invention provides an adiabatic exhaust pipe for a vehicle including an inorganic binder having high heat resistance, durability and heat insulating property by using an inorganic binder strong in heat with a heat insulating material.

In order to solve the above-described problems, the present invention provides an exhaust emission control device comprising: (a) an exhaust pipe made of a metal and connected between an exhaust pipe of an engine and a post-treatment device; (b) a glass wool layer surrounding the outside of the exhaust pipe and impregnated with an inorganic binder; And (c) an outer cover made of a metal thin plate material that surrounds and protects the outer circumferential surface of the glass wool layer.

The inorganic binder may be composed of 10 to 17 parts by weight of silicon oxide (SiO2), 3 to 8 parts by weight of a silicone compound, 3 to 8 parts by weight of a modified silicate, and the balance.

The silicone compound is a polysiloxane, and the modified silicate may include an alkali metal silicate.

The glass wool layer has a density of 120 to 180 kg / m 3 and a thickness of 10 to 20 mm.

A plurality of embossings may be formed on the entire outer cover through the embossing process.

The outer cover may have a thickness of 0.1 to 0.5 mm and the welding extension of the outer cover may be cut and formed by extending 7 to 20 mm longer than the end of the glass wool layer.

Since the heat insulating exhaust pipe for a vehicle according to the present invention can provide a single layer heat resistant structure having high heat dissipation performance (heat insulating performance) and ensuring thermal durability by using an inorganic binder having high heat resistance, Can be usefully used.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a state in which a normal vehicle exhaust pipe is connected and connected between an exhaust system of a vehicle engine and a post-treatment apparatus.
2 is a cross-sectional view of a vehicle heat insulating material according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Throughout the specification, when an element is referred to as "including " an element, it means that it can include other elements, not excluding other elements, unless specifically stated otherwise.

The present invention is capable of various modifications and various embodiments and is intended to illustrate and describe the specific embodiments in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms used in the description are used only to describe certain embodiments and are not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present invention, terms such as comprise, having, or the like are intended to designate the presence of stated features, integers, steps, operations, elements, parts or combinations thereof, and may include one or more other features, , But do not preclude the presence or addition of one or more other features, elements, components, components, or combinations thereof.

(A) an exhaust pipe made of a metal and connected between an exhaust pipe of the engine and a post-treatment device; (b) a glass wool layer surrounding the outside of the exhaust pipe and impregnated with an inorganic binder; And (c) an outer cover made of a metal thin plate material that surrounds and protects the outer circumferential surface of the glass wool layer.

Generally, as shown in Fig. 1, an exhaust system of a vehicle is generally composed of an exhaust engine 2 in which a plurality of branch pipes connected to an engine 1 are combined into one, and various particulate matter, carbon monoxide, hydrocarbons A diesel particulate filter (DPF), a diesel oxidation catalyst (DOC), and a selective catalytic reduction (SCR) for removing harmful particulates (soot) such as nitrogen oxides An exhaust pipe 4 in the shape of a bending and crunching bend for connecting the exhaust pipe 2 and the post-treatment device 3 to each other, and an exhaust pipe 4 for reducing noise and discharging the exhaust gas to the outside of the vehicle The exhaust gas from the engine 1 is exhausted to the outside through the muffler 5 while the exhaust gas from the engine 1 is exhausted from the engine 1. In the present invention, The temperature of the exhaust gas In order to prevent the heat from being lost in the exhaust pipe 4, a heat insulating material having a single layer structure composed of a heat insulating material impregnated with an inorganic binder on the outer circumferential surface of the exhaust pipe 4 and a stainless steel foil embossing foil for protecting the exhaust pipe 4, The exhaust gas temperature from the engine 1 is sent to the post-treatment device 3 in a state in which the temperature of the exhaust gas from the engine 1 is not reduced, Thereby increasing the efficiency.

The exhaust pipe (a) is connected to an exhaust pipe of the engine and a post-treatment device, and serves as a passage through which the exhaust gas burned in the engine passes through the exhaust pipe. Since such an exhaust pipe serves as a passage through which hot exhaust gas passes, it is desirable to select and use a material that can minimize corrosion due to the high temperature exhaust gas. The exhaust pipe may be made of iron, aluminum, stainless steel or titanium, and may be plated with titanium oxide or zinc, which is painted with a heat-resistant paint or resistant to corrosion to prevent corrosion.

The glass wool layer (b) is installed so as to surround the outer circumferential surface of the exhaust pipe, and can have a heat insulation performance due to an air layer therein. However, when the glass wool layer is made of only glass wool, the glass wool may be detached or damaged depending on the impact or the movement of the vehicle. Since the material thickness is uneven and the heat insulating performance deteriorates, it is preferable to use the glass wool impregnated in the inorganic binder.

The glass wool layer has a density of 120 to 180 kg / m 3 and a thickness of 10 to 20 mm. In the case of the conventional exhaust pipe insulator, the heat resistance of the binder is lowered and the glass wool layer is doubled to enhance the heat durability of the binder in the outer glass wool layer. However, since the glass wool layer of the present invention uses an inorganic binder having high heat resistance, The same or higher heat insulating property can be ensured. In this case, the density of the glass wool layer may be 120 to 180 kg / m 3, more preferably 150 to 170 kg / m 3, and most preferably 160 kg / m 3. When the glass wool layer has a density of less than 120 kg / Convection may occur and insulation performance may be deteriorated. If the density is higher than 180 kg / m 3, the content of the internal air may be decreased to deteriorate the heat insulating performance. The thickness of the glass wool layer may be 10 to 20 mm, preferably 10 to 13 mm. If the thickness of the glass wool layer is less than 10 mm, the heat insulating performance is poor. If the thickness is more than 20 mm, .

The glass wool layer may be impregnated with an inorganic binder. The inorganic binder acts as a bridge between the glass wool fibers to prevent the glass wool from coming off or being damaged. When the glass wool layer is impregnated with a large amount of inorganic binder to minimize the internal air layer, the durability is improved. And when the inorganic binder is fabricated by impregnating a small amount of an inorganic binder, the inorganic binder is used only for fixing the glass wool, and a large amount of air layer can be contained therein, so that the heat insulating property is improved.

The inorganic binder may be composed of 10 to 17 parts by weight of silicon oxide (SiO2), 3 to 8 parts by weight of a silicone compound, 3 to 8 parts by weight of a modified silicate, and the balance. The silicon oxide is added to increase the heat insulating performance, and when added within the above range, the heat insulating performance can be increased by about 10 to 15%. Therefore, when the amount is less than 10 parts by weight, the heat insulating performance of the glass wool layer may be deteriorated. If the amount is more than 17 parts by weight, it is difficult to further increase the effect.

The silicone compound is added for maintaining the thickness of the glass wool fiber and for crosslinking adhesion, and polysiloxane is preferably used. When the amount of the silicone compound added is less than 3 parts by weight, the glass wool fibers may not be able to be crosslinked and adhere to each other, resulting in damage to the glass wool layer due to dropping or impact. When the amount of the silicone compound is more than 8 parts by weight, Can occur.

The modified silicate may be added to improve the heat resistance of the inorganic binder, and may preferably include at least one selected from alkali metal silicate, more preferably lithium silicate, sodium silicate, and potassium silicate. When the modified silicate is contained in an amount of less than 3 parts by weight, heat resistance may be deteriorated and the binder may be damaged by a high temperature exhaust gas. If the modified silicate is contained in an amount exceeding 8 parts by weight, the inner air content of the glass wool layer may be decreased, have.

The outer cover (c) covers the outer circumferential surface of the glass wool layer and is made of a thin metal material having a thickness of 0.1 to 0.5 mm, And the end portions of the end portions abutting each other are welded integrally with each other through welding or the like. The outer cover covers the outer side of the outer glass wool layer and protects the glass, So that it is prevented from being damaged or desorbed by the high temperature or external impact. Further, the welding extension portion of the outer cover may be cut and formed by extending 7 to 20 mm longer than the end of the glass wool layer. If the welding extension portion is formed to extend to less than 7 mm, melting of the glass wool or modification of the inorganic binder may occur during welding, resulting in deterioration of the heat insulating property. If the welding is extended beyond 20 mm, Damage due to impact may occur.

A plurality of embossings may be formed on the entire outer cover through the embossing process. In the embossing molding process, it is preferable to form a plurality of embossings having a diameter of 1 to 10 mm densely, and the embossing may further improve an adiabatic effect by further forming an air layer between the glass wool layer and the outer cover.

Further, on the outer surface of the glass wool layer, an outer skin made of aluminum fiber may be additionally provided to detach and damage the glass wool and to improve the assemblability.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be understood, however, that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly explain the present invention in the drawings, parts not related to the description are omitted.

Example 1

5 wt% of silicon compound, 13 wt% of silicon oxide, 4 wt% of modified silicate and 78 wt% of water were mixed to prepare an inorganic binder. The prepared inorganic binder is impregnated with glass wool and then subjected to primary press molding so as to have a semicircular cross section in a shape conforming to one half or the other half of the outer circumferential surface of the bent exhaust pipe in a predetermined shape, Respectively. At this time, the heating temperature was 280 占 폚, and the mixture was impregnated with 30 parts by weight of an inorganic binder based on 100 parts by weight of glass wool. The prepared glass wool layer had a density of 160 kg / m 3 and the glass wool was adjusted to have a thickness of 13 mm (see FIG. 2). The prepared glass wool layer was 1 m in length and flow rate was 980 kg / h.

Example 2

The same procedure as in Example 1 was conducted except that the density of the glass wool layer was 130 kg / m < 3 >.

Example 3

Except that the density of the glass wool layer was changed to 110 kg / m 3 in Example 1.

Example 4

Except that the density of the glass wool layer was 170 kg / m < 3 > in Example 1.

Example 5

Except that the density of the glass wool layer was changed to 200 kg / m < 3 > in the above Example 1.

Example 6

Except that the thickness of the glass wool layer in Example 1 was 10 mm.

Example 7

The same procedure as in Example 1 was repeated except that the thickness of the glass wool layer was 5 mm.

Example 8

Except that the thickness of the glass wool layer was changed to 15 mm in Example 1.

Example 9

The same procedure as in Example 1 was repeated except that the thickness of the glass wool layer was 25 mm.

Comparative Example 1

The procedure of Example 1 was repeated except that a binder containing no modified silicate was used as the inorganic binder.

Comparative Example 2

Except that an organic binder (polyethylene glycol, PEG) was used in place of the inorganic binder in Example 1 above.

Comparative Example 3

A glass wool layer having the same shape as in Example 1 was prepared using a double-layered glass wool and a binder in the same manner as the registered patent No. 10-1418236.

The inner glass wool layer and the outer glass wool layer are impregnated with a binder and the upper and lower layers are stacked in a state where they are bent in a predetermined shape to form a semicircular cross section in a shape corresponding to one half of the outer circumferential surface of the exhaust pipe or the other half of the outer circumferential surface And heated to a constant temperature to integrate the inner and outer glass wool layers.

At this time, the thickness of the inner glass wool layer was 10 mm, the thickness of the outer glass wool layer was 12 mm, and the density of the inner and outer glass wool layers was 120 kg / m 3.

As the binder, 5% by weight of the same silicone compound, 13% by weight of silicon oxide, 4% by weight of modified silicate and 78% by weight of water were mixed.

Comparative Example 4

Except that an organic binder (polyethylene glycol, PEG) was used in place of the inorganic binder in Comparative Example 3.

Experimental Example 1

The glass wool layers prepared in Examples 1 to 9 and Comparative Examples 1 to 4 were installed outside the exhaust pipe, and then subjected to a heat conduction test. The results are shown in Table 1 below. In order to maintain a constant inlet temperature, a flow having a temperature similar to the exhaust gas temperature was implemented by using a gas burner and a blower, and the outlet temperature was kept at a constant temperature for 10 minutes.

Inlet temperature (캜) Outlet temperature (캜) Delta T (° C) Example 1 600 584 16 Example 2 600 582 18 Example 3 600 580 20 Example 4 600 586 14 Example 5 600 590 10 Example 6 600 581 19 Example 7 600 570 30 Example 8 600 588 12 Example 9 600 596 4 Comparative Example 1 600 584 16 Comparative Example 2 600 578 22 Comparative Example 3 600 585 15 Comparative Example 4 600 586 14

As shown in Table 1, it was confirmed that Example 1 exhibited the same performance as Comparative Example 3 using the existing double-layer glass wool.

Also, it was confirmed that as the thickness and density of the glass wool layer decreased, the outlet temperature was lowered and the heat insulating performance was lowered (Examples 2, 3, 6 and 7). As in Example 1 and Comparative Example 2, It was confirmed that the outlet temperature was lowered according to the use of the inorganic binder to increase the heat insulating performance.

Experimental Example  2

In order to test the heat resistance of the glass wool layer prepared in Examples 1 to 9 and Comparative Examples 1 to 4, the experiment was carried out in the same manner as in Experimental Example 1, except that the test time was set to 5 hours, And the results are shown in Table 2 below.

10 minutes 1 hours 2 hours 3 hours 4 hours 5 hours Example 1 584 ° C 584 ° C 584 ° C 584 ° C 584 ° C 584 ° C Example 2 582 DEG C 582 DEG C 582 DEG C 582 DEG C 582 DEG C 582 DEG C Example 3 580 ° C 580 ° C 580 ° C 580 ° C 580 ° C 580 ° C Example 4 586 ° C 586 ° C 586 ° C 586 ° C 586 ° C 586 ° C Example 5 590 ° C 590 ° C 590 ° C 590 ° C 590 ° C 590 ° C Example 6 581 DEG C 581 DEG C 581 DEG C 581 DEG C 581 DEG C 581 DEG C Example 7 570 ° C 570 ° C 570 ° C 570 ° C 570 ° C 570 ° C Example 8 588 ° C 588 ° C 588 ° C 588 ° C 588 ° C 588 ° C Example 9 596 ° C 596 ° C 596 ° C 596 ° C 596 ° C 596 ° C Comparative Example 1 584 ° C 582 DEG C 580 ° C 578 ° C 578 ° C 578 ° C Comparative Example 2 578 ° C 576 ° C 574 ° C 572 DEG C 572 DEG C 572 DEG C Comparative Example 3 590 ° C 590 ° C 590 ° C 590 ° C 590 ° C 590 ° C Comparative Example 4 586 ° C 584 ° C 582 DEG C 580 ° C 580 ° C 580 ° C

As shown in Table 2, in the case of Example 1 and Comparative Examples 3 to 9 using the same inorganic binder, high temperature durability was shown because there was no large temperature change after 5 hours. However, in Comparative Example 1 in which modified silicate was not used, Comparative Example 2 and Comparative Example 4 in which an organic binder was used, it was confirmed that the outlet temperature was lowered with time and the thermal insulation performance and thermal durability were inferior.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, those skilled in the art will appreciate that such specific embodiments are merely preferred embodiments and that the scope of the present invention is not limited thereto will be. Accordingly, the actual scope of the present invention will be defined by the appended claims and their equivalents.

1. Engine 2. Exhaust engine
3. Post-treatment device 4. Exhaust pipe
5. muffler 6. glass layer
7. External cover

Claims (6)

(a) an exhaust pipe connected to an exhaust pipe of the engine and a post-treatment device, the exhaust pipe being made of metal, the exhaust gas burned in the engine passing through the exhaust pipe;
(b) a single glass wool layer surrounding the outside of the exhaust pipe and impregnated with an inorganic binder; And
(c) an outer cover made of a thin metal sheet which surrounds and protects the outer circumferential surface of the single glass wool layer;
And an exhaust pipe for exhausting the exhaust gas,
The inorganic binder is composed of 10 to 17 parts by weight of silicon oxide (SiO2), 3 to 8 parts by weight of a silicone compound, 3 to 8 parts by weight of a modified silicate,
The glass wool layer has a density of 170 to 180 kg / m 3 and a thickness of 15 to 20 mm,
Wherein the difference between the inlet temperature and the outlet temperature of the exhaust pipe is 14 占 폚 or less.
delete The method according to claim 1,
Wherein the silicone compound is a polysiloxane, and the modified silicate comprises an alkali metal silicate.
delete The method according to claim 1,
Wherein a plurality of embossings are formed on the entire outer cover through the embossed molding process.
The method according to claim 1,
Wherein the outer cover is 0.1-0.5 mm thick and the welding extension of the outer cover is cut and formed by 7-20 mm longer than the end of the glass wool layer.

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