KR20240039713A - Particulate reduction filter with a stacked structure of electrically heated filter elements - Google Patents

Abstract

The present invention provides an upper ceramic insulator including an upper exhaust gas passage space; An upper electric heating plate located below the upper ceramic insulator, one side of which is fixed to the upper ceramic insulator, a plurality of through holes formed on the surface, and heat generated when current is supplied; An upper filter plate located below the upper electric heating plate and coated with catalyst; It is located at the bottom of the upper ceramic insulator and fixed to the upper ceramic insulator, and the other side of the upper electric heating plate is fixed so that the upper filter plate is located between the upper electric heating plate, and there is an exhaust gas passage space at the bottom of the upper filter plate. A ceramic insulator comprising; A lower filter plate located below the ceramic insulator and coated with catalyst; It is located at the bottom of the lower filter plate, and one side is fixed to the ceramic insulator so that the lower filter plate is positioned between the ceramic insulator. A plurality of through holes are formed on the surface, and the lower electric heating plate generates heat when current is supplied. Filter unit structures comprising: an electrically heated, catalyst-coated soot filtration filter, wherein the filter unit structures are laminated in such a way that the upper ceramic insulator of the first filter unit structure is connected to the ceramic insulator of the second filter unit structure. You can.

Description

Particulate reduction filter with a stacked structure of electrically heated filter elements}

The present invention relates to an exhaust gas reduction device including an electrically heated, catalyst-coated soot filter. More specifically, the present invention relates to an exhaust gas reduction device that includes an electric heater and a catalyst-coated filter to reduce HC and NOx emitted during a cold start of a vehicle. It relates to an exhaust gas reduction device including an electrically heated, catalyst-coated soot filtration filter constructed by stacking filter unit structures that can rapidly reduce .

Recently, as automobile emission standards have been strengthened, various types of emission reduction devices are being developed.

Traditionally, a three-way catalytic converter (TWC) has been used to reduce emissions from gasoline engines, but recently, in order to meet the stricter emission standards for gasoline engines, particulate matter (PM; Particulate) generated from gasoline engines has been used. Matter) and gaseous harmful gases (HC, CO, NOx), as shown in Figure 1, an electric heater (10) (EHC, Electrically Heated Catalyst), three-way catalyst (20) (TWC), and smoke. A device connecting a filtration filter 30 (GPF; Gasoline Particulate Filter) is being developed.

However, this device has the disadvantage of being bulky due to the presence of an electric heater 10, a three-way catalyst 20, and a soot filter 30, respectively.

The conventional electric heater 10 is a swirl-shaped electric heater and is used to quickly heat the three-way catalyst during the initial cold start of the engine. However, the conventional electric heater 10 has small ceramic rods installed to prevent short circuits, and its structure is complicated because a large number of ceramic rods must be installed, making it difficult to manufacture and vulnerable to vibration.

In addition, it is attempted to improve the catalytic reaction by directly coating the electric heater 10 with a catalyst, but when power is connected to the electric heater 10, the temperature rises very high and thermal expansion occurs. In this case, the electric heater 10 has a thermal expansion rate of On the other hand, ceramic coating materials have a low coefficient of thermal expansion, so there is a problem of damage due to thermal shock.

In addition, since the three-way catalyst 20 is located behind the electric heater 10, there is a problem that auxiliary air must be supplied for heat transfer.

Many inventors are conducting a lot of research to solve these problems, but satisfactory results have not yet been produced.

The technical problem to be achieved by an exhaust gas reduction device including an electrically heated, catalyst-coated soot filtration filter according to embodiments of the technical idea of the present invention is to achieve a structure in which an electric heater and a catalyst-coated filter are combined to cool the vehicle. The goal is to provide an exhaust gas reduction device that can quickly reduce HC and NOx emitted during startup.

Another technical problem to be achieved by an exhaust gas reduction device including an electrically heated catalyst-coated soot filtration filter according to embodiments of the technical idea of the present invention is to provide exhaust gas with a simplified and miniaturized structure and improved durability. It is to provide a reduction device.

The technical problems to be achieved by the exhaust gas reduction device including an electrically heated catalyst-coated soot filtration filter according to the technical idea of the present invention are not limited to the problems mentioned above, and other problems not mentioned are described below. It will be clearly understandable to those skilled in the art.

A filter unit structure according to an embodiment according to the technical idea of the present invention is a filter unit structure used in an exhaust gas reduction device, and includes a ceramic filter structure configured to filter particulate matter; a first electric heating plate located on one side of the ceramic filter structure and configured to generate heat; And it may include a second electric heating plate located on the other side of the ceramic filter structure and configured to generate heat.

The ceramic filter structure includes a ceramic filter plate, and a gas inlet configured to allow exhaust gas to flow may be formed at one end of the ceramic filter plate.

The first electric heating plate or the second electric heating plate may be designed to supply current in parallel.

The exhaust gas flowing in through the gas inlet may be configured to move through the first electric heating plate or the second electric heating plate.

The first electric heating plate or the second electric heating plate includes a central area and an outer area, and the amount of exhaust gas passing through the central area may be different from the amount of exhaust gas passing through the outer area.

The first electric heating plate or the second electric heating plate includes a plurality of air passages through which exhaust gas can pass, and the diameter of the plurality of air passages may be 0.1 mm or less.

It further includes a second ceramic filter plate fixed to the ceramic filter plate with the first electric heating plate or the second electric heating plate interposed therebetween, and a first electric heating plate or a second electric heating plate at one end of the second ceramic filter plate. A gas outlet configured to allow exhaust gas passing through the plate to flow out may be formed.

A filter unit structure according to an embodiment of the technical idea of the present invention is a filter unit structure used in an exhaust gas reduction device, and the ceramic filter structure includes a ceramic insulator; A first filter plate located between the ceramic insulator and the first electric heating plate; and a second filter plate positioned between the ceramic insulator and the second electric heating plate, and a gas inlet configured to allow exhaust gas to flow may be formed on one side of the ceramic insulator.

The first filter plate and the second filter plate may be coated with a catalyst.

The exhaust gas flowing through the gas inlet may be configured to move through the first filter plate and the first electric heating plate, or may be configured to move through the second filter plate and the second electric heating plate.

The first electric heating plate or the second electric heating plate includes a central area and an outer area, and the amount of exhaust gas passing through the central area may be different from the amount of exhaust gas passing through the outer area.

The first electric heating plate or the second electric heating plate includes a plurality of air passages through which exhaust gas can pass, and the diameter of the plurality of air passages may be 0.1 mm or less.

The electrical resistance of the first electric heating plate may be smaller than that of the first filter plate, and the electrical resistance of the second electrical heating plate may be smaller than that of the second filter plate.

The filter unit structure further includes a second ceramic filter structure fixed to the ceramic filter structure with the first electric heating plate or the second electric heating plate interposed therebetween, and the second ceramic filter structure includes a second ceramic insulator. 2 A gas outlet may be formed on one side of the ceramic insulator through which exhaust gas passing through the first or second electric heating plate flows out.

A filter unit structure according to an embodiment of the technical idea of the present invention is a filter unit structure used in an exhaust gas reduction device, including a ceramic filter plate coated with a catalyst; a first electric heating plate located on one side of the ceramic filter plate and configured to generate heat; and a second electric heating plate located on the other side of the ceramic filter plate and configured to generate heat, wherein the ceramic filter plate is connected to the first electric heating plate by a ceramic bonding method, and the ceramic filter plate is connected to the second electric heating plate. and can be connected by a ceramic bonding method.

A smoke filtration filter according to an embodiment according to the technical idea of the present invention includes a first filter unit structure; and a second filter unit structure, and the first filter unit structure and the second filter unit structure may be stacked in such a way that they are connected to each other.

At least one of the first filter unit structure and the second filter unit structure includes: a ceramic filter structure configured to filter particulate matter; a first electric heating plate located on one side of the ceramic filter structure and configured to generate heat; and a second electric heating plate located on the other side of the ceramic filter structure and configured to generate heat, and a gas flow path through which exhaust gas can flow may be formed at one end of the ceramic filter structure.

The gas flow path of the first filter unit structure may be located at an end opposite to the gas flow path of the second filter unit structure.

A soot filtration filter according to an embodiment of the technical idea of the present invention includes a gas inlet configured to allow gas to flow; a first electric heating plate located on the first side and configured to generate heat; and a second electric heating plate located on a second side opposite the first side and configured to generate heat, wherein the first electric heating plate and the second electric heating plate are connected by a ceramic insulator to heat the gas flowing in through the gas inlet. An internal space through which gas flows can be formed.

The ceramic insulator connecting the first electric heating plate and the second electric heating plate may have a cylindrical shape.

An exhaust gas reduction device according to an embodiment according to the technical idea of the present invention may include a smoke filtration filter according to any one of the previous embodiments.

According to embodiments of the technical idea of the present invention, an exhaust gas reduction device including an electrically heated, catalyst-coated soot filtration filter has a structure in which an electric heater and a catalyst-coated filter are combined, and the exhaust gas reduction device includes an electric heater and a catalyst-coated filter to reduce exhaust gases emitted when the vehicle is cold-started. HC and NOx can be quickly reduced.

An exhaust gas reduction device including an electrically heated catalyst-coated soot filtration filter according to embodiments of the technical idea of the present invention has a simplified and miniaturized structure and can provide an exhaust gas reduction device with improved durability. there is.

However, the effects that can be achieved by the exhaust gas reduction device including an electrically heated catalyst-coated soot filtration filter according to an embodiment of the present invention are not limited to those mentioned above, and other effects not mentioned are It will be clearly understandable to those skilled in the art from the following description.

In order to more fully understand the drawings cited in this specification, a brief description of each drawing is provided.
1 is a schematic diagram of a conventional exhaust gas reduction device.
Figure 2 is a schematic diagram of an exhaust gas reduction device according to an embodiment of the present invention.
Figure 3 is a cross-sectional view schematically showing a filter unit structure used in an exhaust gas reduction device according to an embodiment of the present invention.
Figure 4 is a cross-sectional view schematically showing the combined structure of an exhaust gas reduction device according to an embodiment of the present invention.
Figure 5 is a schematic diagram of an electric heating plate according to an embodiment of the present invention.
Figure 6 is a cross-sectional view schematically showing the combined structure of an exhaust gas reduction device according to an embodiment of the present invention.
Figure 7 is a schematic diagram of a soot filtration filter used in an exhaust gas reduction device according to an embodiment of the present invention.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail through detailed description. However, this is not intended to limit the present invention to specific embodiments, and the present invention should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

In describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. In addition, numbers (eg, first, second, etc.) used in the description of this specification are merely identifiers to distinguish one component from another component.

In addition, in this specification, when a component is referred to as "connected" or "connected" to another component, the component may be directly connected or directly connected to the other component, but specifically Unless there is a contrary description, it should be understood that they may be connected or connected through another component in the middle.

In addition, the components expressed as '~ part' in this specification may be two or more components combined into one component, or one component may be differentiated into two or more components according to more detailed functions. In addition, each of the components described below may additionally perform some or all of the functions of other components in addition to the main functions that each component is responsible for, and some of the main functions of each component may be different from other components. Of course, it can also be performed exclusively by a component.

Hereinafter, embodiments based on the technical idea of the present invention will be described in detail one by one.

Figure 2 is a schematic diagram of an exhaust gas reduction device according to an embodiment of the present invention, and Figure 3 is a cross-sectional view schematically showing a filter unit structure used in an exhaust gas reduction device according to an embodiment of the present invention. 4 is a cross-sectional view schematically showing the combined structure of an exhaust gas reduction device according to an embodiment of the present invention. Figure 5 is a schematic diagram of an electric heating plate according to an embodiment of the present invention, Figure 6 is a cross-sectional view schematically showing the combined structure of an exhaust gas reduction device according to an embodiment of the present invention, and Figure 7 is a schematic diagram of an electric heating plate according to an embodiment of the present invention. This is a schematic diagram of a soot filtration filter used in an exhaust gas reduction device according to an embodiment.

The exhaust gas reduction device 100 according to an embodiment of the present invention includes an electrically heated catalyst-coated soot filtration filter 101, and the electrically heated catalyst-coated soot filtration filter 101 includes a plurality of filter unit structures 102. ) are stacked and connected, and the filter unit structure 102 includes a ceramic insulator 110, an upper filter plate 120, a lower filter plate 130, an upper electric heating plate 140, and a lower electric heating plate 150. and an upper ceramic insulator 160. At this time, the ceramic insulator 110, upper filter plate 120, lower filter plate 130, upper electric heating plate 140, and lower electric heating plate 150 form a ceramic filter structure for filtering particulate matter. .

The ceramic insulator 110 may include an exhaust gas passage space 111 through which exhaust gas passes and is discharged to the outside. The ceramic insulator 110 is a 'ㄷ' shaped member consisting of a first support part 115, a second support part 116, and a third support part 117. The first support part 115, the second support part 116 And the central area 112 surrounded by the third support part 117 and the open area 113 facing the second support part 116 may form the exhaust gas passing space 111.

The upper and lower surfaces of the first support part 115, the second support part 116, and the third support part 117 may be flat surfaces. Holes through which bolts can penetrate and fasten may be formed on the upper and lower surfaces of the first support part 115 and the third support part 117, and can be used for coupling with the upper ceramic insulator 160, which will be described later.

The ceramic insulator 110 performs an electrical insulation function to prevent the upper electric heating plate 140 and the lower electric heating plate 150 from electrically short-circuiting each other.

The upper filter plate 120 and lower filter plate 130 are ceramic or metal fiber filter plates and perform the function of filtering soot particles. The upper filter plate 120 and the lower filter plate 130 may be made of aluminum oxide.

The upper filter plate 120 is located on top of the ceramic insulator 110, is made of a porous material, and is coated with a catalyst to purify exhaust gas. Specifically, the upper filter plate 120 may be positioned so that the edge of the upper filter plate 120 spans the upper surfaces of the first support portion 115, the second support portion 116, and the third support portion 117. Bolt holes formed on the upper surfaces of the first support part 115, the second support part 116, and the third support part 117 may be located outside the edge of the upper filter plate 120.

The lower filter plate 130 is located below the ceramic insulator 110, is made of a porous material, and is coated with a catalyst to purify exhaust gas. Specifically, the lower filter plate 130 may be positioned so that the edges of the lower filter plate 130 span the lower surfaces of the first support portion 115, the second support portion 116, and the third support portion 117. Bolt holes formed on the lower surfaces of the first support part 115, the second support part 116, and the third support part 117 may be located outside the edge of the lower filter plate 130.

The lower surface areas of the first support part 115, the second support part 116, and the third support part 117 where the lower filter plate 130 and the lower electric heating plate 150 are in contact with the lower filter plate 130 and the lower electric heating plate 150. It can be formed concavely by leaving a step equal to the sum of the thickness of the heating plate 150, and the lower filter plate 130 and the lower electric heating plate 150 are accommodated in this concave area to form the first support portion 115 and the second support portion 115. The lower surfaces of the support part 116 and the third support part 117 and the lower surface of the lower electric heating plate 150 may form the same plane.

The upper electric heating plate 140 is located above the upper filter plate 120, and has a plurality of through holes 141 through which exhaust gas passes, and can generate heat when current is supplied. The upper electric heating plate 140 may be made of Fe-Cr-Al alloy material and may be a very thin plate with a thickness of 0.1 mm.

The through holes 141 of the upper electric heating plate 140 may be formed to have a diameter of 0.1 mm or less. Since the through holes 141 are fine holes, they can be uniformly formed using an etching method rather than a drilling method. It may be possible to adjust the size, number, and distribution of the through holes 141 through an etching method.

By adjusting the size, number, and distribution of the through holes 141, the electrical resistance distribution of the upper electric heating plate 140 can be adjusted, thereby inducing uniform heat generation. As an example, more through holes 141 of the upper electric heating plate 140 are arranged in the central area than in the outer area, so that the total area of the through holes 141 is larger in the central area and extends to the outside of the upper electric heating plate 140. By gradually decreasing the amount, uniform heat generation of the upper electric heating plate 140 can be induced. The through holes 141 may have a circular, square, or other shape.

The upper electric heating plate 140 may have a symmetrical left and right shape so that electric current is evenly distributed and electric heating is uniform. The electrical resistance of the upper electric heating plate 140 may be smaller than that of the upper filter plate 120 so that current does not flow through the upper filter plate 120.

The upper electric heating plate 140 may include a first upper electric heating plate connection plate 144 and a second upper electric heating plate connection plate 146.

The first upper electric heating plate connection plate 144 is connected to the first end of the upper electric heating plate 140 so that the upper electric heating plate 140 is connected to and fixed to the second support portion 116 of the ceramic insulator 110. It is a member that protrudes downward at (143). The first upper electric heating plate connection plate 144 may be connected to and fixed to the side of the second support portion 116 and may be fixed with bolts.

The upper filter plate 120 may be fixed to the ceramic insulator 110 by the upper electric heating plate 140. Additionally, the upper filter plate 120 and the upper electric heating plate 140 can be connected with ceramics, which improves the heat transfer effect and improves exhaust gas purification efficiency under cold starting conditions.

The second upper electric heating plate connection plate 146 is a member that protrudes upward from the second end 145 facing the first end 143 of the upper electric heating plate 140, and the upper ceramic insulator 160 to be described later. It may be connected to and fixed to the side of the second upper support portion 166.

The lower electric heating plate 150 is located below the lower filter plate 130, and has a plurality of through holes 151 through which exhaust gas passes, and can generate heat when current is supplied. The lower electric heating plate 150 may be made of Fe-Cr-Al alloy material and may be a very thin plate with a thickness of 0.1 mm.

The through holes 151 of the lower electric heating plate 150 may be formed to have a diameter of 0.1 mm or less. Since the through holes 151 are fine holes, they can be uniformly formed using an etching method rather than a drilling method. It may be possible to adjust the size, number, and distribution of the through holes 141 through an etching method.

By adjusting the size, number, and distribution of the through holes 151, the electrical resistance distribution of the lower electric heating plate 150 can be adjusted, thereby inducing uniform heat generation. As an example, more through holes 151 of the lower electric heating plate 150 are arranged in the central area than in the outer area, so that the total area of the through holes 151 is larger in the central area and extends to the outside of the lower electric heating plate 150. By decreasing the amount, uniform heat generation of the lower electric heating plate 150 can be induced. Through holes may be circular, square, or other shapes.

The lower electric heating plate 150 may have a symmetrical left and right shape so that electric current is evenly distributed and electric heating is uniform. The electrical resistance of the lower electric heating plate 150 may be smaller than that of the lower filter plate 130 so that current does not flow through the lower filter plate 130.

The lower electric heating plate 150 may include a first lower electric heating plate connection plate 154 and a second lower electric heating plate connection plate 156.

The first lower electric heating plate connection plate 154 is connected to the first end of the lower electric heating plate 150 so that the lower electric heating plate 150 is connected to and fixed to the second support portion 116 of the ceramic insulator 110. It is a member that protrudes upward at (153). The first lower electric heating plate connection plate 154 may be connected to and fixed to the side of the second support portion 116 and may be fixed with bolts.

The lower filter plate 130 may be fixed to the ceramic insulator 110 by the lower electric heating plate 150. Additionally, the lower filter plate 130 and the lower electric heating plate 150 can be connected using a ceramic bonding method, which improves the heat transfer effect and improves exhaust gas purification efficiency under cold starting conditions.

An upper catalyst plate for purifying gas is additionally positioned between the upper filter plate 120 and the upper electric heating plate 140, and a lower plate for purifying gas is positioned between the lower filter plate 130 and the lower electric heating plate 150. A catalytic plate may be additionally located. The electrical resistance of the upper electric heating plate 140 may be smaller than that of the upper catalyst plate, and the electrical resistance of the lower electrical heating plate 150 may be smaller than that of the lower catalyst plate.

The upper ceramic insulator 160 is located above the upper electric heating plate 140 and may include an upper exhaust gas passage space 161.

The upper ceramic insulator 160 is a 'ㄷ'-shaped member consisting of a first upper support part 165, a second upper support part 166, and a third upper support part 167, and the first upper support part 165 and the third upper support part 167 An upper central area 162 surrounded by the second upper support 166 and the third upper support 167 and an upper open area 163 facing the second upper support 166 define an upper exhaust gas passage space 161. can be formed.

The upper and lower surfaces of the first upper support part 165, the second upper support part 166, and the third upper support part 167 may be flat surfaces. Holes through which bolts can penetrate and fasten may be formed on the upper and lower surfaces of the first upper support part 165 and the third upper support part 167.

The lower surface areas of the first upper support part 165, the second upper support part 166, and the third upper support part 167 where the upper filter plate 120 and the upper electric heating plate 140 are in contact with the upper filter plate 120. It can be formed concavely by leaving a step equal to the sum of the thicknesses of the and the upper electric heating plate 140, and the upper filter plate 120 and the upper electric heating plate 140 are accommodated in this concave area to accommodate the first upper support portion 165. ), the lower surfaces of the second upper support part 166 and the third upper support part 167 and the lower surface of the upper filter plate 120 may form the same plane.

The first upper support part 165 is fixed in contact with the third support part 117, the third upper support part 167 is fixed in contact with the first support part 115, and the second upper support part 166 is in an open area. Located above 113 , the upper open area 163 may be located above the second support 116 . That is, the ceramic insulator 110 and the upper ceramic insulator 160 may be connected so that the upper open area 163 and the open area 113 are located in opposite directions. The ceramic insulator 110 and the upper ceramic insulator 160 may be connected and fixed using various known connection methods such as bolts.

The upper ceramic insulator 160 is combined with the ceramic insulator 110 and functions to fix the upper filter plate 120 and the upper electric heating plate 140 therebetween. In addition, as described later, it functions to connect to the lower electric heating plate and ceramic insulator of other filter unit structures.

The second upper electric heating plate connection plate 146 of the upper electric heating plate 140 is connected to and fixed to the side of the second upper support part 166, and is connected to the second lower electric heating plate of the lower electric heating plate 150. The plate 156 may be connected to and fixed to the side of the second upper support portion of the upper ceramic insulator of another filter unit structure located below the filter unit structure 102. A bolt connection method may be used as a fixation method.

The second lower electric heating plate connection plate 156 of the lower electric heating plate 150 is a member that protrudes downward from the second end 155 facing the first end 153 of the lower electric heating plate 150, It may be connected to the side of the second upper support portion of the upper ceramic insulator of another filter unit structure located below the filter unit structure 102.

In this way, stacked connection of filter unit structures can be easily achieved. That is, the upper surface of the upper ceramic insulator of another filter unit structure is connected to and fixed to the lower surface of the ceramic insulator 110 of the filter unit structure 102, and the second lower electric heating plate connection plate 156 is connected to the lower surface of the ceramic insulator 110 of the filter unit structure 102. The upper ceramic insulator is connected to and fixed to the side of the second upper support portion. As a fixation method, a bolt connection method, etc. may be used.

A plurality of filter unit structures 102 are stacked and connected to form the electrically heated catalyst-coated soot filtration filter 101, the exterior of the electrically heated catalyst-coated soot filtration filter 101 is canned, and the upper electric heating plate ( 140) and the lower electric heating plate 150 can be connected to a power source to form the exhaust gas reduction device 100.

The exhaust gas passes through the through holes 141 of the upper electric heating plate 140 and the upper filter plate 120 and is discharged through the exhaust gas passing space 111, and the through hole of the lower electric heating plate 150 ( 151) and the lower filter plate 130 may be discharged through the exhaust gas passage space 111.

Here, the upper electric heating plate 140 and the upper filter plate 120 are fixed to the ceramic insulator 110 in a contact state, and the lower electric heating plate 150 and the lower filter plate 130 are in contact with the ceramic insulator 110. Since it is fixed to the insulator 110, the soot accumulated on the upper filter plate 120 and lower filter plate 130 can be burned off periodically or when necessary, and the gaseous substances such as unburned hydrocarbons, CO, and Nox are coated with a catalyst. It can be purified through a catalytic reaction while passing through the upper filter plate 120 and lower filter plate 130.

When the exhaust gas temperature is low, such as at the beginning of startup, the exhaust gas temperature is quickly raised using the heat generated from the upper electric heating plate 140 and the lower electric heating plate 150, thereby reducing the temperature of the upper filter plate 120 and the lower filter plate. By increasing the temperature of (130) to actively occur the catalytic reaction, the purification characteristics of the gaseous exhaust gas can be improved.

Additionally, the size of the exhaust gas reduction device 100 can be greatly reduced by combining an electric heater and a catalyst-coated filter. In addition, the exhaust gas reduction device 100 has a structure in which a plurality of filter unit structures 102 are stacked and connected, so it is easier to manufacture and has excellent durability compared to the prior art.

The exhaust gas reduction device 200 according to an embodiment of the present invention includes an electrically heated catalyst-coated soot filtration filter 203, and the electrically heated catalyst-coated soot filtration filter 203 includes a plurality of filter unit structures 202. ) are stacked and connected, and the filter unit structure 202 may include a ceramic filter structure configured to filter particulate matter, a first electric heating plate 220, and a second electric heating plate 230, and the ceramic The filter structure may include a ceramic filter plate 210.

The ceramic filter plate 210 may include a gas inlet 211 for introducing exhaust gas into the internal space of the ceramic filter plate 210. The gas inlet 211 may be formed at one end of the ceramic filter plate 210, and the exhaust gas may move toward the internal space of the ceramic filter plate 210 through the gas inlet 211.

The ceramic filter plate 210 performs an electrical insulation function to prevent the first electric heating plate 220 and the second electric heating plate 230 from being electrically short-circuited, and has the function of filtering soot particles with a filter plate made of ceramic. Perform. The ceramic filter plate 210 may also be made of a porous material and may be coated with a catalyst to purify exhaust gas.

The ceramic filter plate 210 may be formed by extrusion molding a filter plate for filtering soot particles and a ceramic material, or may be formed by any other method.

A first electric heating plate 220 may be located on the upper part of the ceramic filter plate 210, and a second electric heating plate 230 may be located on the lower part of the ceramic filter plate 210.

The first electric heating plate 220 is located on the ceramic filter plate 210, has a plurality of through holes through which exhaust gas passes, and can generate heat when current is supplied. The first electric heating plate 220 may be made of Fe-Cr-Al alloy material and may be a very thin plate with a thickness of 0.1 mm.

The through holes of the first electric heating plate 220 may be formed to have a diameter of 0.1 mm or less. Since the through holes are micro holes, they can be formed uniformly by an etching method rather than a drilling method. It may be possible to adjust the size, number, and distribution of through holes through an etching method.

By adjusting the size, number, and distribution of through holes, the electrical resistance distribution of the first electric heating plate 220 can be adjusted, thereby inducing uniform heat generation. As an example, more through holes of the first electric heating plate 220 are arranged in the central area than in the outer area, so that the total area of the through holes increases in the central area and decreases toward the outside of the first electric heating plate 220. 1 Uniform heat generation of the electric heating plate 220 can be induced. Through holes may be circular, square, or other shapes.

The first electric heating plate 220 may have a symmetrical shape on the left and right sides so that the current is evenly distributed and the electric heating can be uniform. The electrical resistance of the first electric heating plate 220 may be smaller than that of the ceramic filter plate 210 so that current does not flow through the ceramic filter plate 210.

The first electric heating plate 220 may be designed as a parallel type to solve the disadvantage that a large amount of current flows through the entire electric heating plate when connecting the electric heating plates in series. In a parallel design, current can flow from one end to the other, and then from the other end to one end.

The second electric heating plate 230 is located below the ceramic filter plate 210, has a plurality of through holes through which exhaust gas passes, and can generate heat when current is supplied. The second electric heating plate 230 may be made of Fe-Cr-Al alloy material and may be a very thin plate with a thickness of 0.1 mm.

The through holes of the second electric heating plate 230 may be formed to have a diameter of 0.1 mm or less. Since the through holes are micro holes, they can be formed uniformly by an etching method rather than a drilling method. It may be possible to adjust the size, number, and distribution of through holes through an etching method.

The electrical resistance distribution of the second electric heating plate 230 can be adjusted by adjusting the size, number, and distribution of the through holes, thereby inducing uniform heat generation. As an example, more through holes of the second electric heating plate 230 are arranged in the central area than in the outer area, so that the total area of the through holes increases in the central area and decreases toward the outside of the second electric heating plate 230, thereby reducing the total area of the through holes. 2 Uniform heat generation of the electric heating plate 230 can be induced. Through holes may be circular, square, or other shapes.

The second electric heating plate 230 may have a symmetrical left and right shape so that the current is evenly distributed and electric heating is uniform. The electrical resistance of the second electric heating plate 230 may be smaller than that of the ceramic filter plate 210 so that current does not flow through the ceramic filter plate 210.

The second electric heating plate 230 may be designed as a parallel type to solve the disadvantage that a large amount of current flows through the entire electric heating plate when the electric heating plates are connected in series. In a parallel design, current can flow from one end to the other, and then from the other end to one end.

Holes through which bolts, etc. can penetrate and fasten may be formed on the upper and lower surfaces of the edges of the ceramic filter plate 210, the first electric heating plate 220, and the second electric heating plate 230. The filter unit structures 202 may be connected and fixed using various known connection methods such as bolts.

In the filter unit structure 202 used in the exhaust gas reduction device 200, the filter unit structure 202 further includes a second ceramic filter plate 240 located on the first electric heating plate 220. can do.

The second ceramic filter plate 240 is fixed to the ceramic filter plate 210 with the first electric heating plate 220 in between, and a second ceramic filter plate 240 is installed at one end of the second ceramic filter plate 240. ) A gas outlet 241 may be formed through which internal exhaust gas can flow out to the outside.

The second ceramic filter plate 240 is a filter plate made of ceramic and performs the function of filtering soot particles. The second ceramic filter plate 240 may also be made of a porous material and may be coated with a catalyst to purify exhaust gas.

The second ceramic filter plate 240 may be formed by extrusion molding a filter plate for filtering soot particles and a ceramic material, or may be formed by any other method.

The gas outlet 241 of the second ceramic filter plate 240 is located at the opposite end of the end where the gas inlet 211 of the ceramic filter plate 210 is located, and flows through the gas inlet 211 to the ceramic filter plate 210. ) The exhaust gas that enters the inside passes through a plurality of through holes of the first electric heating plate 220 and moves to the second ceramic filter plate 240, and then flows through the gas outlet 241 in the opposite direction to the inflow direction. It can be leaked to the outside.

A third ceramic filter plate (not shown) may also be located below the second electric heating plate 230 of the filter unit structure 202 used in the exhaust gas reduction device 200.

The third ceramic filter plate is the same filter plate as the ceramic filter plate 210 and the second ceramic filter plate 240, and the third ceramic filter plate is a ceramic filter plate through the gas inlet 211 of the ceramic filter plate 210. (210) It may include a gas outlet (not shown) through which exhaust gas that flows inside and then moves to the third ceramic filter plate through the second electric heating plate 230 can flow out to the outside. The gas outlet of the third ceramic filter plate is formed in the opposite direction to the gas inlet 211 of the ceramic filter plate 210.

Due to this stacking method, the connected filter unit structures 202 can be overlapped in opposite directions to form a catalyst-coated soot filtration filter 230 that is electrically heated.

The exhaust gas reduction device 200 can be formed by caning the exterior of the electrically heated catalyst-coated soot filter 230 and connecting power to the first electric heating plate 220 and the second electric heating plate 230. there is.

Since the first electric heating plate 220 and the second electric heating plate 230 are fixed in contact with the ceramic filter plate 210, the soot accumulated on the ceramic filter plate 210 can be burned off periodically or when necessary. Unburned hydrocarbons, CO, and Nox, which are gaseous substances, can be purified through a catalytic reaction while passing through the catalyst-coated ceramic filter plate 210.

When the exhaust gas temperature is low, such as at the beginning of starting, the temperature of the ceramic filter plate 210 is raised quickly by using the heat generated from the first electric heating plate 220 and the second electric heating plate 230 to quickly increase the exhaust gas temperature. By increasing the catalytic reaction to actively occur, the gaseous exhaust gas purification characteristics can be improved.

Additionally, the size of the exhaust gas reduction device 200 can be greatly reduced by combining an electric heater and a catalyst-coated filter. In addition, the exhaust gas reduction device 200 has a structure in which a plurality of filter unit structures 202 are stacked and connected, so it is easier to manufacture and has excellent durability compared to the prior art.

The soot filtration filter used in the exhaust gas reduction device according to an embodiment of the present invention includes a first filter unit structure and a second filter unit structure, and the first filter unit structure and the second filter unit structure are connected to each other. It can be characterized as being laminated.

At least one of the first filter unit structure or the second filter unit structure included in the soot filtration filter may be composed of a filter unit structure according to an embodiment of the present invention.

The filter unit structure included in the soot filtration filter includes a ceramic filter structure, a first electric heating plate located on one side of the ceramic filter structure and configured to generate heat, and a second electric heating plate located on the other side of the ceramic filter structure and configured to generate heat. It may include a plate, and a gas flow path through which exhaust gas can flow may be formed at one end of the ceramic filter structure.

The first filter unit structure and the second filter unit structure included in the soot filtration filter are stacked in opposite directions, so that the gas flow path of the first filter unit structure may be located in the opposite direction to the gas flow path of the second filter unit structure. there is.

The soot filtration filter 300 used in the exhaust gas reduction device according to an embodiment of the present invention includes a gas inlet 340 that allows exhaust gas to flow into the soot filtration filter 300, and a soot filtration filter 300. A first electric heating plate 320 located on the first side and configured to generate heat, a second electric heating plate 330 located on the second side opposite the first side and configured to generate heat, and a ceramic insulator 310. may include.

The first electric heating plate 320 has a plurality of through holes through which exhaust gas passes, and can generate heat when current is supplied. The first electric heating plate 320 may be made of Fe-Cr-Al alloy material and may be a very thin plate with a thickness of 0.1 mm.

The through holes of the first electric heating plate 320 may be formed to have a diameter of 0.1 mm or less. Since the through holes are micro holes, they can be formed uniformly by an etching method rather than a drilling method. It may be possible to adjust the size, number, and distribution of through holes through an etching method.

By adjusting the size, number, and distribution of through holes, the electrical resistance distribution of the first electric heating plate 320 can be adjusted, thereby inducing uniform heat generation. As an example, more through holes of the first electric heating plate 320 are arranged in the central area than in the outer area, so that the total area of the through holes increases in the central area and decreases toward the outside of the first electric heating plate 320. 1 Uniform heat generation of the electric heating plate 320 can be induced. Through holes may be circular, square, or other shapes.

The first electric heating plate 320 may have a symmetrical shape on the left and right sides so that the current is evenly distributed and the electric heating can be uniform.

The first electric heating plate 320 may be designed as a parallel type to solve the disadvantage that a large amount of current flows through the entire electric heating plate when the electric heating plates are connected in series. In a parallel design, current can flow from one end to the other, and then from the other end to one end.

The second electric heating plate 330 has a plurality of through holes through which exhaust gas passes, and can generate heat when current is supplied. The second electric heating plate 330 may be made of Fe-Cr-Al alloy material and may be a very thin plate with a thickness of 0.1 mm.

The through holes of the second electric heating plate 330 may be formed to have a diameter of 0.1 mm or less. Since the through holes are micro holes, they can be formed uniformly by an etching method rather than a drilling method. It may be possible to adjust the size, number, and distribution of through holes through an etching method.

By adjusting the size, number, and distribution of through holes, the electrical resistance distribution of the second electric heating plate 330 can be adjusted, thereby inducing uniform heat generation. As an example, more through holes of the second electric heating plate 330 are arranged in the central area than in the outer area, so that the total area of the through holes increases in the central area and decreases toward the outside of the second electric heating plate 330, thereby reducing the total area of the through holes. 2 Uniform heat generation of the electric heating plate 330 can be induced. Through holes may be circular, square, or other shapes.

The second electric heating plate 330 may have a symmetrical left and right shape so that the electric current is evenly distributed and electric heating is uniform.

The second electric heating plate 330 may be designed as a parallel type to solve the disadvantage that a large amount of current flows through the entire electric heating plate when connecting the electric heating plates in series. In a parallel design, current can flow from one end to the other, and then from the other end to one end.

The first electric heating plate 320 and the second electric heating plate 330 may be connected to each other by a ceramic insulator 310. The ceramic insulator 310 performs an electrical insulation function to prevent the first electric heating plate 320 and the second electric heating plate 330 from being electrically short-circuited with each other.

The ceramic insulator may be cylindrical, hemispherical, square, or any other shape.

The soot filtration filter 300 may include a gas inlet 340 on one side for introducing exhaust gas into the internal space 350 within the soot filtration filter 300 . The gas inlet may be located in the opposite direction of the ceramic structure 310.

The exhaust gas flowing into the internal space 350 through the gas inlet 340 may pass through the first electric heating plate 320 or the second electric heating plate 330 and be discharged to the outside.

The above description sets forth the best mode of the invention and provides examples to illustrate the invention and to enable any person skilled in the art to make and use the invention. The specification prepared in this way does not limit the present invention to the specific terms presented.

Accordingly, although the present invention has been described in detail with reference to the above-described examples, those skilled in the art may make modifications, changes, and variations to the examples without departing from the scope of the present invention.

10: Electric heater
20: Three-way catalyst
30: Smoke filtration filter
100: exhaust gas reduction device
101: Electrically heated, catalyst-coated soot filtration filter
102: Filter unit structure
110: ceramic insulator
111: exhaust gas passing space
112: Central area
113: Open area
115: first support portion
116: second support portion
117: third support
120: upper filter plate
130: Lower filter plate
140: Upper electric heating plate
141: Through hole
143: 1st end
144: First upper electric heating plate connection plate
145: second end
146: Second upper electric heating plate connection plate
150: Lower electric heating plate
151: Through hole
153: 1st end
154: First lower electric heating plate connection plate
155: second terminus
156: Second lower electric heating plate connection plate
160: upper ceramic insulator
161: exhaust gas passing space
162: Upper central area
163: upper open area
165: first upper support
166: second upper support
167: Third upper support
200: exhaust gas reduction device
201: Electric heating plate
202: Filter unit structure
203: Electrically heated catalyst coated soot filtration filter
211: gas inlet
210: Ceramic filter plate
220: 1st electric heating plate
230: Second electric heating plate
240: second ceramic filter plate
241: gas outlet
300: Soot filtration filter
310: ceramic insulator
320: First electric heating plate
330: Second electric heating plate
340: gas inlet
350: interior space
360: electrode

Claims (7)

As a soot filtration filter,
a first filter unit structure; and
Contains a second filter unit structure,
A soot filtration filter, wherein the first filter unit structure and the second filter unit structure are stacked in such a way that they are connected to each other.
According to claim 1,
At least one of the first filter unit structure or the second filter unit structure,
A ceramic filter structure configured to filter particulate matter;
a first electric heating plate located on one side of the ceramic filter structure and configured to generate heat; and
It includes a second electric heating plate located on the other side of the ceramic filter structure and configured to generate heat,
A soot filtration filter in which a gas flow path through which exhaust gas can flow is formed at one end of the ceramic filter structure.
According to claim 2,
A soot filtration filter in which the gas flow path of the first filter unit structure is located at the other end opposite to the gas flow path of the second filter unit structure.
As a soot filtration filter,
a gas inlet configured to allow gas to enter;
a first electric heating plate located on the first side and configured to generate heat; and
It includes a second electric heating plate located on a second side opposite to the first side and configured to generate heat,
A soot filtration filter in which the first electric heating plate and the second electric heating plate are connected by a ceramic insulator to form an internal space through which gas introduced through the gas inlet flows.
According to claim 4,
The ceramic insulator connecting the first electric heating plate and the second electric heating plate is a soot filter having a cylindrical shape.
The method of claim 4, wherein the gas introduced through the gas inlet is configured to move through the first electric heating plate or the second electric heating plate, and the first electric heating plate or the second electric heating plate is configured to allow the discharged gas to pass through. A soot filtration filter comprising a plurality of air passages.
As an exhaust gas reduction device,
An exhaust gas reduction device comprising a soot filtration filter defined by any one of claims 1 to 6.