阅读说明：本技术 用于防止堵塞的排放气体再循环过滤器 (Exhaust gas recirculation filter for preventing clogging ) 是由 金钟天 于 2019-04-08 设计创作，主要内容包括：本发明公开了一种用于防止堵塞的排放气体再循环过滤器,所述排放气体再循环过滤器(EGR过滤器)配置成用于防止堵塞,所述EGR过滤器布置在EGR管路中并且安装在EGR过滤器组件中,所述EGR管路将从发动机排出的排放气体的部分再循环到发动机,所述EGR过滤器组件过滤排放气体中所包含的异物,其中,所述EGR过滤器编织成具有金属材料的纬丝和经丝的斜纹编织物。(An exhaust gas recirculation filter (EGR filter) configured to prevent clogging is disposed in an EGR line that recirculates a portion of exhaust gas discharged from an engine to the engine and installed in an EGR filter assembly that filters foreign substances contained in the exhaust gas, wherein the EGR filter is woven into a twill weave having weft and warp threads of a metal material.)

1. An exhaust gas recirculation filter for preventing clogging, which is installed in an exhaust gas recirculation line that recirculates a portion of exhaust gas discharged from an engine to the engine, and in an exhaust gas recirculation filter assembly that filters foreign substances contained in the exhaust gas,

wherein the exhaust gas recirculation filter is woven into a twill weave having weft yarns and warp yarns.

2. The exhaust gas recirculation filter for preventing clogging according to claim 1,

wherein the warp yarns are in plural form to form a plurality of warp yarns, the weft yarns are in plural form to form a plurality of weft yarns,

wherein each of the weft filaments passes a predetermined number of warp filaments and then crosses an adjacent warp filament of the plurality of warp filaments.

3. The exhaust gas recirculation filter for preventing clogging according to claim 2, wherein said predetermined number of warp threads is three or more.

4. The exhaust gas recirculation filter for preventing clogging according to claim 2, wherein weft filaments adjacent to each other are crossed with warp filaments different from each other among the plurality of warp filaments.

5. The exhaust gas recirculation filter for preventing clogging according to claim 1, wherein said weft and warp are made of a metal material.

6. The exhaust gas recirculation filter for preventing clogging according to claim 1, wherein said weft and warp are different materials.

7. The exhaust gas recirculation filter for preventing clogging according to claim 1, wherein said weft filaments and said warp filaments have different thermal expansion rates.

8. The exhaust gas recirculation filter for preventing clogging according to claim 7, wherein a thermal expansion rate of a material forming said warp filaments is larger than a thermal expansion rate of said weft filaments.

9. The exhaust gas recirculation filter for preventing clogging according to claim 8,

wherein the weft is made of SUS300 series material;

wherein the warp yarn is made of SUS400 series material.

10. The exhaust gas recirculation filter for preventing clogging according to claim 1, wherein said exhaust gas recirculation filter assembly is installed at a low pressure exhaust gas recirculation line of an exhaust gas recirculation system.

Technical Field

The present invention relates to an Exhaust Gas Recirculation (EGR) filter mounted on an EGR cooler of an EGR system of a vehicle, and more particularly, to an EGR filter for preventing clogging, which can improve the fluidity of EGR gas by enlarging an effective space and thermally expanding asymmetrically, thereby preventing a phenomenon of clogging by carbon, soot and foreign substances.

Background

In a vehicle, some of exhaust gas burned in an engine is recirculated to reduce the amount of harmful substances contained in the exhaust gas.

When the exhaust gas is recirculated, the combustion temperature in the engine is lowered to reduce nitrogen oxides (NOx) contained in the exhaust gas, which is one of measures against the regulation of the exhaust gas.

The EGR system may be divided into LP-EGR (low pressure-EGR) and HP-EGR (high pressure-EGR) depending on the installation location.

In a supercharged vehicle (e.g., a turbocharger), due to high-pressure exhaust gas characteristics, LP-EGR 60 is disposed at the rear end portion of after-treatment unit 40 in addition to mounting HP-EGR 50 at the rear end portion of the exhaust manifold, thereby creating a normal operating environment by ensuring hydraulic pressure.

The exhaust system of an engine employing HP-EGR 50 and LP-EGR 60 is shown in FIG. 1.

The external air flowing from the outside flows into each cylinder of the engine 10 through the compressor 32 of the turbocharger 30, the intercooler 13, and the intake manifold 12 arranged in the intake pipe 11. Exhaust gas generated after combustion in the engine 10 passes through the exhaust manifold 22, the turbine 31 of the turbocharger 30 disposed in the exhaust line 21, passes through an aftertreatment device 40, such as a Diesel Particulate Filter (DPF) or a Diesel Oxidation Catalyst (DOC), and is then released to the outside.

At this time, the high-pressure EGR line 51 is arranged such that the exhaust manifold 22 and the intake manifold 12 are connected, and the high-pressure EGR valve 52 and the high-pressure EGR cooler 53 are arranged in the high-pressure EGR line 51. The high-pressure EGR valve 52 controls the amount of exhaust gas recirculated through the high-pressure EGR line 51, and the high-pressure EGR cooler 53 cools the recirculated exhaust gas.

Also, a low-pressure EGR line 61 is arranged such that the rear end portion of the aftertreatment device 40 and the front end portion of the compressor 32 are connected to each other, and a low-pressure EGR valve 62 and a low-pressure EGR cooler 63 are arranged in the low-pressure EGR line 61. Also, the low-pressure EGR valve 62 controls the amount of exhaust gas recirculated through the low-pressure EGR line 61, and the low-pressure EGR cooler 63 cools the recirculated exhaust gas.

Meanwhile, since the exhaust gas flows into the front end portion of the compressor at the low pressure EGR line 61, the EGR filter assembly 170 is disposed to protect components (e.g., blades, a compressor wheel, etc.) of the compressor 32.

As shown in fig. 2, the EGR filter assembly 170 includes an EGR filter 171 woven with wire and mounted inside a housing 172. In the EGR filter assembly 170 according to the conventional art, the EGR filter 171 is manufactured by weaving wire rods into weft and warp. The weft 171a and the warp 171b are manufactured by plain weaving (plain weave), in other words, by alternately weaving the weft 171a and the warp 171b to cross each other. Since the EGR filter 171 is woven by plane weaving of wire rods of the same material as the weft wires 171a and the warp wires 171b, there is a problem in that clogging of the mesh of the EGR filter 171 occurs due to soot, carbon, or other foreign substances. Since the weft 171a and the warp 171b are plain woven, the texture is hard. Further, since the weft 171a and the warp 171b are wire rods of the same material, the thermal expansion coefficients are equal to each other, so that the weft 171a and the warp 171b thermally expand at the same rate even during thermal expansion. Therefore, soot, carbon, or other foreign substances that are clogged between the mesh holes of the EGR filter are deposited in the EGR filter 171, which are not easily removed from the EGR filter 171, resulting in clogging.

When the EGR filter 171 is clogged, there is a problem in that the pressure difference in the LP-EGR line 61 increases and the cooling performance of the LP-EGR cooler 63 becomes poor.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

Various aspects of the present invention are directed to provide an EGR filter for preventing clogging, in which the EGR filter is arranged to enlarge an inner effective space thereof and is asymmetrically thermally expanded for self-cleaning of deposits, thereby preventing the EGR filter from being clogged with carbon, soot, and foreign substances.

The EGR filter for preventing clogging according to an exemplary embodiment of the present invention to achieve the above object is disposed in an EGR line that recirculates a portion of exhaust gas discharged from an engine to the engine and installed in an EGR filter assembly that filters foreign substances contained in the exhaust gas; the EGR filter is woven into a twill weave (twill weave) having weft and warp threads of a metal material.

The weft may pass a predetermined number of warp filaments and then cross adjacent warp filaments.

Weft filaments adjacent to each other may be crossed with warp filaments different from each other.

The weft and warp filaments may have different rates of thermal expansion.

The thermal expansion rate of the material forming the warp filaments may be greater than the thermal expansion rate of the weft filaments.

The weft may be made of SUS300 series material; the warp yarn may be made of SUS400 series material.

The EGR filter assembly may be disposed at a low-pressure EGR line of the EGR system.

According to the EGR filter for preventing clogging having the above-mentioned configuration, by weaving the EGR filter with twill-woven weft and warp, it is possible to prevent accumulation of carbon, soot, and foreign substances by increasing an effective space ratio.

Further, since the weft and warp constituting the EGR filter have different thermal expansion rates, deposited carbon, soot and foreign substances can be easily removed, and self-cleaning becomes possible.

Other features and advantages of the methods and apparatus of the present invention will be more particularly apparent from or elucidated with reference to the drawings described herein, and subsequently, described in conjunction with the accompanying drawings, which serve to explain certain principles of the invention.

Drawings

FIG. 1 is a schematic illustration of an engine;

FIG. 2 is a cross-sectional view of an EGR filter according to the conventional art;

FIG. 3 is a schematic view showing a weaving state of an EGR filter according to a conventional art;

FIG. 4 is a schematic view illustrating a weaving state of an EGR filter according to an exemplary embodiment of the present invention;

FIGS. 5A and 5B are diagrams illustrating a state where the effective space ratio is increased in an EGR filter according to an exemplary embodiment of the present invention;

fig. 6 shows a schematic diagram of the thermal expansion state in the EGR filter according to an exemplary embodiment of the present invention.

It is to be understood that the appended drawings are not to scale, showing a somewhat simplified representation of various features illustrative of the basic principles of the invention. The specific design features of the invention disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes, will be determined in part by the particular application and environment of use contemplated.

In the drawings, reference numerals refer to identical or equivalent parts of the invention throughout the several views of the drawings.

Detailed Description

Reference will now be made in detail to various embodiments of the invention, examples of which are illustrated in the accompanying drawings and described below. While the invention will be described in conjunction with the exemplary embodiments, it will be understood that this description is not intended to limit the invention to those exemplary embodiments. On the contrary, the invention is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims.

For a better understanding of the present invention, exemplary embodiments thereof will be explained with reference to the accompanying drawings. The exemplary embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the exemplary embodiments described in detail below. The present exemplary embodiments are provided to more fully describe the present invention to those skilled in the art. Therefore, the shapes of elements and the like in the drawings may be exaggerated to emphasize clearer description. It is noted that like parts in each of the drawings are denoted by like reference numerals. Detailed descriptions of well-known features and configurations that may unnecessarily obscure the subject matter of the present invention are omitted.

The EGR filter assembly provided with the EGR filter 71 according to the exemplary embodiment of the present invention is disposed in the EGR line (particularly, the low-pressure EGR line 61), circulates a part of the exhaust gas discharged from the engine 10 back to the engine 10, and filters foreign substances.

In the EGR filter assembly, an EGR filter 71 having woven weft and warp is mounted inside a housing.

In the exemplary embodiment of the present invention, the EGR filter 71 is woven using wires, and the weft 71a and the warp 71b are woven in a twill weave.

In the EGR filter 71 woven using metal wires, instead of a plain weave in which weft and warp are always crossed with each other, the weft 71a and warp 71b are woven into a twill weave to span two or more strands, so that carbon, soot, and foreign matter are easily separated and do not clog the EGR filter 71. The twill weave is formed by crossing weft and warp yarns while weaving the weft and warp yarns across two or more yarns so that crossing points of the weft and warp yarns are formed in a direction inclined thereto. On the other hand, since the weft and warp are always crossed in a plain weave, the crossing of the weft and warp is also formed in a lattice form.

In twill weaving, the weft yarns are crossed with the warp yarns after skipping two or more strands of the yarn, so that the fabric woven in twill weaving is more elastic than the fabric made in plain weaving.

In weaving the weft 71a and the warp 71b, the weft 71a passes over two or more predetermined number of warp 71b to cross at the next warp 71b and the present pattern is repeated, and the weft 71a and the warp 71b are woven into a twill weave.

For example, in fig. 4, a weft 71a passes over three warp filaments 71b, then crosses over the next warp filament 71b, passes over three warp filaments 71b again, and then weaves in a repeating manner in the warp filaments 71 b.

Weft 71a crosses over at warp 71b, which weft 71a is different from another adjacent weft 71 a. In other words, in fig. 4, first weft 71a may intersect third warp 71b, second weft 71a may intersect fourth warp 71b, third weft 71a may intersect second warp 71b, and fourth weft 71a may intersect first warp 71 b.

Since the weft 71a and the warp 71b are woven in twill weave, it is possible to prevent the filter from being clogged by increasing an effective space and easily discharging carbon, soot, and foreign substances, compared to the case of weaving in plain weave.

In other words, as shown in fig. 5A and 5B, when the weft 171a and the warp 171B are woven into a plain weave, the area a formed by the gaps between the weft filaments adjacent to each other and the gaps between the warp filaments adjacent to each other becomes an effective space. Thus, in fig. 5A, when two weft filaments 171a and four warp filaments 171b are woven, three spaces with areas a are formed. Here, the effective space becomes a space between lines of the open space in the filtering area.

However, when the weft 71a and the warp 71b are woven into a twill weave, the area a' formed by the rectangular connecting points where the weft 71a and the warp 71b cross becomes an effective space instead of the area formed by the weft adjacent to each other or the warp adjacent to each other. Accordingly, when two weft filaments 71a and four warp filaments 71B are woven, in fig. 5B, a rectangular area having a width three times that of the space between warp filaments 71B and a height of the gap between weft filaments 71a adjacent to each other becomes an effective space.

The area a 'of the effective space in the twill weave is larger than the area a of the effective space in the plain weave, and since the area a' of the effective space in the twill weave is larger than three times the area a of the effective space in the plain weave, filter clogging due to carbon, soot, and foreign substances can be prevented in the EGR filter 71.

Also, in an exemplary embodiment of the present invention, the weft 71a and the warp 71b may include wires of different materials. Weft filaments 71a and warp filaments 71b may comprise wires having different rates of thermal expansion such that weft filaments 71a and warp filaments 71b thermally expand asymmetrically during heating.

The weft 71a may be made of a wire of SUS400 series material, and the warp 71b may be made of a wire of SUS300 series material. The SUS300 series metal and the SUS400 series metal have different thermal expansion rates. The thermal expansion coefficient of SUS300 series metal is about 3 times that of SUS400 series metal. Therefore, when the exhaust gas is supplied to the EGR filter 71 and the temperature of the EGR filter 71 increases, the weft threads 71a and the warp threads 71b thermally expand. After the engine is stopped and the EGR filter 71 is cooled, the weft 71a and the warp 71b are thermally contracted. At this time, since the warp yarn 71b has a thermal expansion coefficient larger than that of the weft yarn 71a, the warp yarn 71b is deformed by a larger amount, and thus carbon, soot, and foreign substances may be easily separated inside the EGR filter 71.

On the other hand, the material of the weft 71a may be a material having a larger thermal expansion rate than the warp 71 b.

As described above, when the EGR filter 71 according to the exemplary embodiment of the present invention is woven using the weft 71a and the warp 71b, the EGR filter 71 is woven by twill weaving to enlarge an effective space, and the warp 71b is made of a material having a higher thermal expansion coefficient than the weft 71a to be asymmetrically thermally expanded during heating, making self-cleaning of carbon, soot and foreign substances possible.

For convenience in explanation and accurate definition in the appended claims, the terms "above", "below", "inner", "outer", "upper", "lower", "upward", "downward", "front", "rear", "back", "inside", "outside", "inward", "outward", "inside", "outside", "inner", "outer", "forward" and "rearward" are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. The foregoing description is not intended to be exhaustive or to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable others skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the following claims and their equivalents.