WO2019128559A1 - 一种抗热震非对称蜂窝陶瓷壁流式过滤器 - Google Patents

一种抗热震非对称蜂窝陶瓷壁流式过滤器 Download PDF

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Publication number
WO2019128559A1
WO2019128559A1 PCT/CN2018/116702 CN2018116702W WO2019128559A1 WO 2019128559 A1 WO2019128559 A1 WO 2019128559A1 CN 2018116702 W CN2018116702 W CN 2018116702W WO 2019128559 A1 WO2019128559 A1 WO 2019128559A1
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Prior art keywords
inlet
honeycomb ceramic
outlet
section
connecting lines
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PCT/CN2018/116702
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English (en)
French (fr)
Inventor
宋锡滨
张兵
张曦
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山东国瓷功能材料股份有限公司
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Priority to US16/767,738 priority Critical patent/US11454150B2/en
Publication of WO2019128559A1 publication Critical patent/WO2019128559A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
    • B01D46/2429—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material of the honeycomb walls or cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2466—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the adhesive layers, i.e. joints between segments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/247—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2474—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the walls along the length of the honeycomb
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2482—Thickness, height, width, length or diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2486—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure characterised by the shapes or configurations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2486—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure characterised by the shapes or configurations
    • B01D46/249—Quadrangular e.g. square or diamond
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2498—The honeycomb filter being defined by mathematical relationships
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/0006—Honeycomb structures
    • C04B38/0016—Honeycomb structures assembled from subunits
    • C04B38/0019—Honeycomb structures assembled from subunits characterised by the material used for joining separate subunits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2825—Ceramics
    • F01N3/2828—Ceramic multi-channel monoliths, e.g. honeycombs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • B01D2258/012—Diesel engines and lean burn gasoline engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/06—Ceramic, e.g. monoliths
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/30—Honeycomb supports characterised by their structural details

Definitions

  • the present invention relates to the field of honeycomb ceramic filters, and more particularly to a thermal shock resistant asymmetric honeycomb ceramic wall flow filter.
  • Honeycomb ceramic wall flow filters remove carbon black from gasoline and diesel exhaust.
  • the conventional filter design has an imported honeycomb ceramic surface and an outlet honeycomb ceramic surface as an inlet and an outlet, and a porous wall separating the inlet and outlet. These interconnected walls divide the filter into an inlet channel (abbreviation: I) and an outlet channel (abbreviation: O).
  • I inlet channel
  • O outlet channel
  • the structure in which such an interval is blocked is like a chess board.
  • This design forces the exhaust gas to pass through the porous wall, allowing the particulate matter to deposit in the channel or wall.
  • the inlet and outlet channels have a square cross section of the same area. When the amount of carbon black reaches a certain level, the regeneration process takes place and the carbon black is burned off.
  • the object of the present invention is to provide a thermal shock-resistant asymmetric honeycomb ceramic wall flow filter, which solves the problems of poor mechanical properties, high back pressure and poor thermal shock resistance in the prior art.
  • the ratio of the inner diameter of the inlet passage to the inner diameter of the outlet passage ranges from 1.1 to 1.5.
  • the inlet passage has a square cross section and is provided with rounded corners, and the ratio of the distance between the rounded corners of the adjacent inlet passages and the wall thickness ranges from 0.8 to 1.4.
  • the inlet passage has a square cross section and is provided with rounded corners having a radius greater than 20% of the wall thickness and less than 0.3 mm.
  • the inlet passage has a square cross section, and the adjacent two sides are connected by two connecting lines which are sequentially connected, the two connecting lines are obtuse, and the connecting line is connected to the square side thereof.
  • the angle is less than 30°.
  • the cross section of the inlet passage is square, and the adjacent two sides are connected by a connecting portion composed of two connecting lines and an arc, the arc is between the two connecting lines, the two The connecting lines are obtuse, the arc length being less than 30% of the length of the connecting portion.
  • the outlet passage has a square cross section.
  • the outlet passage has a square cross section and is provided with rounded corners having a radius greater than 20% of the wall thickness and less than 0.3 mm.
  • the outlet passage has a square cross section and is provided with a chamfer, and the chamfer has a bevel length ranging from 5% to 30% of the cross section side length of the outlet passage.
  • the invention provides a thermal shock-resistant asymmetric honeycomb ceramic wall flow filter, which is characterized by rounding, double-line or double-line plus arc transformation on the cross section of the inlet passage.
  • the filter has good mechanical properties and low back. Pressure and excellent thermal shock resistance.
  • FIG. 1 is a partial structural schematic view of an inlet honeycomb ceramic surface according to Embodiment 1 of the present invention.
  • FIG. 2 is a partial detail view of I in Figure 1;
  • FIG. 3 is a schematic partial structural view of an inlet honeycomb ceramic surface according to Embodiment 2 of the present invention.
  • FIG. 4 is a partial detail view of I in Figure 3;
  • Figure 5 is a partial detail view of II of Figure 3;
  • FIG. 6 is a schematic partial structural view of an inlet honeycomb ceramic surface according to Embodiment 3 of the present invention.
  • FIG. 7 is a partial detail view of I in Figure 6;
  • Figure 8 is a partial detail view of II of Figure 6;
  • FIG. 9 is a partial structural schematic view of an inlet honeycomb ceramic surface according to Embodiment 4 of the present invention.
  • Figure 10 is a partial detail view of I in Figure 9;
  • FIG. 11 is a partial structural schematic view of an inlet honeycomb ceramic surface according to Embodiment 5 of the present invention.
  • Figure 12 is a partial detail view of I in Figure 11;
  • Figure 13 is a partial detail view of II of Figure 11;
  • Figure 14 is a partial schematic view showing the structure of an inlet honeycomb ceramic surface according to Embodiment 6 of the present invention.
  • Figure 17 is a partial schematic view showing the structure of an inlet honeycomb ceramic surface according to Embodiment 7 of the present invention.
  • Figure 18 is a partial detail view of I in Figure 17;
  • Figure 19 is a partial schematic view showing the structure of an inlet honeycomb ceramic surface according to Embodiment 8 of the present invention.
  • Figure 21 is a partial detail view of II in Figure 19;
  • Figure 22 is a partial schematic view showing the structure of an imported honeycomb ceramic surface according to Embodiment 9 of the present invention.
  • Figure 23 is a partial detail view of I in Figure 22;
  • Figure 24 is a partial detail view of II of Figure 22.
  • connection In the description of the present invention, it should be noted that the terms “installation”, “connected”, and “connected” are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined. Connected, or integrally connected; can be mechanical or electrical; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of the two components.
  • Connected, or integrally connected can be mechanical or electrical; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of the two components.
  • the specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.
  • the honeycomb ceramic filter has an inlet passage 1 for the exhaust gas to enter; and an outlet passage 2 for allowing the exhaust gas to flow out.
  • the inlet and outlet channels 2 are separated by a porous wall.
  • the wall has a porosity of between 20% and 70%.
  • the average pore size is between 5 and 50 microns, preferably between 10 and 30 microns.
  • Honeycomb ceramic filters have from 50 to 350 squares per square inch, preferably from 100 to 300 squares.
  • the wall thickness can range from 0.05 to 0.5 mm, preferably from 0.1 to 0.4 mm.
  • the filter of the present invention has skin, which may be circular, elliptical or other shape.
  • the filter consists of a series of inlet and outlet channels 2 formed by interconnected porous walls.
  • the inlet and outlet channels 2 extend all the way to the length of the filter.
  • This filter is formed by an extrusion process.
  • the material of this filter is ceramic materials such as cordierite, silicon carbide, aluminum titanate, and mullite, but other extrudable materials such as glass, glass ceramics, plastics, and metals. .
  • the ratio of the inner diameter of the inlet passage 1 to the inner diameter of the outlet passage 2 ranges from 1.1 to 1.5. Preferably, the ratio ranges from 1.2 to 1.4.
  • the invention provides a thermal shock-resistant asymmetric honeycomb ceramic wall flow filter, which is characterized by rounding, double-line or double-line plus arc transformation on the cross section of the inlet passage.
  • the filter has good mechanical properties and low back. Pressure and excellent thermal shock resistance.
  • the inlet passage 1 has a square cross section and is provided with rounded corners, and the ratio of the distance between the rounded corners of the adjacent inlet passages 1 and the wall thickness ranges from 0.8 to 1.4, preferably, The ratio ranges from 0.9 to 1.3.
  • the radius of the fillet is greater than 20% of the wall thickness and less than 0.3 mm.
  • the cross section of the outlet passage 2 is square.
  • the inlet passage 1 has a square cross section and is provided with rounded corners, and the ratio of the distance between the rounded corners of the adjacent inlet passages 1 and the wall thickness ranges from 0.8 to 1.4, preferably, The ratio ranges from 0.9 to 1.3.
  • the radius of the fillet is greater than 20% of the wall thickness and less than 0.3 mm.
  • the outlet passage 2 has a square cross section and is provided with rounded corners having a radius greater than 20% of the wall thickness and less than 0.3 mm.
  • the inlet passage 1 has a square cross section and is provided with rounded corners.
  • the ratio of the distance between the rounded corners of the adjacent inlet passages 1 and the wall thickness ranges from 0.8 to 1.4.
  • the ratio ranges from 0.9 to 1.3.
  • the radius of the fillet is greater than 20% of the wall thickness and less than 0.3 mm.
  • the outlet passage 2 has a square cross section and is provided with a chamfer having a bevel length ranging from 5% to 30% of the length of the cross section of the outlet passage 2, preferably, the chamfer may be 45 ° angle, can also be chamfered angle and so on.
  • the cross section of the inlet channel 1 is square, and the adjacent two sides are connected by two connecting lines.
  • the two connecting lines are obtuse, and the angle between the connecting lines and the square sides connected thereto is Less than 30°, preferably, the included angle is less than 15°, and a smaller angle may be selected depending on actual needs.
  • the cross section of the outlet passage 2 is square.
  • the cross section of the inlet channel 1 is square, and the adjacent two sides are connected by two connecting lines.
  • the connecting lines are obtuse, and the angle between the connecting lines and the square sides connected thereto is Less than 30°, preferably, the included angle is less than 15°, and a smaller angle may be selected depending on actual needs.
  • the outlet passage 2 has a square cross section and is provided with rounded corners having a radius greater than 20% of the wall thickness and less than 0.3 mm.
  • the cross section of the inlet passage 1 is square, and the adjacent two sides are connected by two connecting lines, the connecting lines are obtuse angles, and the connecting lines are connected with the square sides of the connecting side thereof.
  • the angle is less than 30°, preferably, the angle is less than 15°, and a smaller angle may be selected depending on actual needs.
  • the outlet passage 2 has a square cross section and is provided with a chamfer having a bevel length ranging from 5% to 30% of the length of the cross section of the outlet passage 2, preferably, the chamfer may be 45 ° angle, can also be chamfered angle and so on.
  • the cross section of the inlet passage 1 is square, and the adjacent two sides are connected by a connecting portion composed of two connecting lines and an arc, and the arc is between the two connecting lines, two The connecting lines are obtuse, and the arc length is less than 30% of the length of the connecting portion, preferably less than 15%.
  • the cross section of the outlet passage 2 is square.
  • the cross section of the inlet channel 1 is square, and the adjacent two sides are connected by a connecting portion composed of two connecting lines and a circular arc, and the arc is between the two connecting lines, two The connecting lines are obtuse, and the arc length is less than 30% of the length of the connecting portion, preferably less than 15%.
  • the outlet passage 2 has a square cross section and is provided with a chamfer having a bevel length ranging from 5% to 30% of the length of the cross section of the outlet passage 2, preferably, the chamfer may be 45 ° angle, can also be chamfered angle and so on.

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  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Filtering Materials (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

一种抗热震非对称蜂窝陶瓷壁流式过滤器，包括：进口蜂窝陶瓷面和出口蜂窝陶瓷面，进口蜂窝陶瓷面和出口蜂窝陶瓷面均设有进口通道（1）和出口通道（2），进口通道（1）与出口通道（2）连通，进口通道（1）的出口端和出口通道（2）的进口端封堵，进口通道（1）的内径大于出口通道（2）的内径；进口通道（1）的横截面为正方形，且设有圆角；或相邻两条边由两条连接线连接；或相邻两条边由两条连接线和圆弧连接，圆弧处于两条连接线之间；出口通道（2）的横截面为正方形，也可设有圆角或倒角。该过滤器具有兼顾良好的力学性能、低背压以及优异的抗热震性能。

Description

一种抗热震非对称蜂窝陶瓷壁流式过滤器 技术领域
本发明涉及蜂窝陶瓷过滤器领域，特别是涉及一种抗热震非对称蜂窝陶瓷壁流式过滤器。
背景技术
蜂窝陶瓷壁流式过滤器可将汽油机及柴油机尾气中的碳黑去除。目前传统的过滤器设计，它有进口蜂窝陶瓷面和出口蜂窝陶瓷面作为进口和出口，以及将进出口隔开的多孔壁。这些相互连接的壁将过滤器分成了进口通道(简称：I)及出口通道(简称：O)。为捕捉碳黑及灰，进口通道的出口端被封堵，而出口通道的进口被堵。这样的间隔被堵的结构就象国际象棋的棋盘。这种设计可强迫尾气从多孔壁上通过，使得颗粒物沉积在通道里或壁上。通常，进出口通道具有同样面积的正方形截面。当碳黑量达到一定程度，再生过程发生，会烧去这些碳黑。
在应用中，同样发现灰也会沉积在进口通道内。这些灰的颗粒，由金属氧化物，硫酸盐，磷酸盐及其它物质组成，它们不会燃烧，所以不会在再生过程中烧去。因此，这些灰会一直沉积在进口通道内，直到被机械性地清洗出来。所以，在灰被清洗出来前，随着发动机的运行时间增加，进口通道中的灰越来越多，整个尾气处理系统的背压会很明显地增加。
目前，降低灰对背压的影响的一种方法是增大进口通道的面积。对于相同的截面积，这就意味着减少出口通道的面积。用这种方法，在增大的进口通道中可容纳更多的颗粒物(碳黑及灰)，也就是说，过滤器储存颗粒物的能力得到提高，从而降低了背压。在一些空间有限的设计中，这种结构对小过滤器的帮助非常重要。在过滤器目数不变的情况下，进口通道的增大会导致两相邻进口通道的角之间距离变小。当这距离变小后，过滤器的力学强度会减弱，从而在生产及应用中产生一系列的问题。
为使力学强度增加，在进口通道的角上可做一些改变。现有技术中，进口通道的角用了倒角。这样，相邻角之间的距离便增大了，从而增加了强度。还有些专利的进口通道的角用了斜切角，与倒角相比，这样的斜切更增加了相邻角之间的距离，从而更加增加了力学强度。
虽然这些发明可增加力学强度，但同时必须考虑背压及抗热震性能。比方说，在壁厚不变的情况下，以上的发明会过多地减少了进口通道面积，从而增加了背压。与此同时，在进口通道变大的情况下，过滤器可容纳更多的颗粒物。为充分利用这一优点，可把再生时间间隔延长，而因此要求更好的抗热震性能。以前的发明没有很好地解决热震的问题，从而限制了此类大入口小出口设计的潜力。
发明内容
(一)要解决的技术问题
本发明的目的是提供一种抗热震非对称蜂窝陶瓷壁流式过滤器，解决现有技术中力学性能差、背压高和抗热震性能差的问题。
(二)技术方案
为了解决上述技术问题，本发明提供一种抗热震非对称蜂窝陶瓷壁流式过滤器，其特征在于，包括：进口蜂窝陶瓷面和出口蜂窝陶瓷面，所述进口蜂窝陶瓷面和所述出口蜂窝陶瓷面均设有进口通道和出口通道，所述进口通道与所述出口通道连通，所述进口通道的出口端和所述出口通道的进口端封堵，所述进口通道的内径大于所述出口通道的内径；所述进口通道的横截面为正方形，且设有圆角；或所述进口通道的横截面为正方形，且相邻两条边由两条连接线连接，所述两条连接线之间为钝角；或所述进口通道的横截面为正方形，且相邻两条边由两条连接线和圆弧连接，所述圆弧处于所述两条连接线之间，所述两条连接线之间为钝角。
其中，所述进口通道的内径与所述出口通道的内径的比例范围为1.1-1.5。
其中，所述进口通道的横截面为正方形，且设有圆角，相邻所述进口通道的圆角之间的距离与壁厚的比例范围为0.8-1.4。
其中，所述进口通道的横截面为正方形，且设有圆角，所述圆角的半径大于壁厚的20％，且小于0.3mm。
其中，所述进口通道的横截面为正方形，且相邻两条边由两条依次连接的连接线连接，所述两条连接线之间为钝角，且所述连接线与其相连的正方形边的夹角小于30°。
其中，所述进口通道的横截面为正方形，且相邻两条边由两条连接线和圆弧组成的连接部连接，所述圆弧处于所述两条连接线之间，所述两条连接线之间为钝角，所述圆弧长度小于所述连接部长度的30％。
其中，所述出口通道的横截面为正方形。
其中，所述出口通道的横截面为正方形，并设有圆角，所述圆角的半径大于壁厚的20％，且小于0.3mm。
其中，所述出口通道的横截面为正方形，且设有倒角，所述倒角的斜边长度范围为所述出口通道的横截面边长的5％-30％。
(三)有益效果
本发明提供的一种抗热震非对称蜂窝陶瓷壁流式过滤器，对进口通道横截面进行圆角、双线或双线加圆弧改造，本过滤器具有兼顾良好的力学性能、低背压以及优异的抗热震性能。
附图说明
图1为本发明实施例1进口蜂窝陶瓷面的局部结构示意图；
图2为图1中Ⅰ的局部细节图；
图3为本发明实施例2进口蜂窝陶瓷面的局部结构示意图；
图4为图3中Ⅰ的局部细节图；
图5为图3中Ⅱ的局部细节图；
图6为本发明实施例3进口蜂窝陶瓷面的局部结构示意图；
图7为图6中Ⅰ的局部细节图；
图8为图6中Ⅱ的局部细节图；
图9为本发明实施例4进口蜂窝陶瓷面的局部结构示意图；
图10为图9中Ⅰ的局部细节图；
图11为本发明实施例5进口蜂窝陶瓷面的局部结构示意图；
图12为图11中Ⅰ的局部细节图；
图13为图11中Ⅱ的局部细节图；
图14为本发明实施例6进口蜂窝陶瓷面的局部结构示意图；
图15为图14中Ⅰ的局部细节图；
图16为图14中Ⅱ的局部细节图；
图17为本发明实施例7进口蜂窝陶瓷面的局部结构示意图；
图18为图17中Ⅰ的局部细节图；
图19为本发明实施例8进口蜂窝陶瓷面的局部结构示意图；
图20为图19中Ⅰ的局部细节图；
图21为图19中Ⅱ的局部细节图；
图22为本发明实施例9进口蜂窝陶瓷面的局部结构示意图；
图23为图22中Ⅰ的局部细节图；
图24为图22中Ⅱ的局部细节图。
图中，1、进口通道；2、出口通道。
具体实施方式
下面结合附图和实施例，对本发明的具体实施方式作进一步详细描述。以下实例用于说明本发明，但不用来限制本发明的范围。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本发明中的具体含义。
如图1-图24所示，本发明公开一种抗热震非对称蜂窝陶瓷壁流式过滤器，其特征在于，包括：进口蜂窝陶瓷面和出口蜂窝陶瓷面，进口蜂窝陶瓷面和出口蜂窝陶瓷面均设有进口通道1和出口通道2，进口通道1与出口通道2连通，进口通道1的出口端和出口通道2的进口端封堵，进口通道1的内径大于出口通道2的内径；进口通道1的横截面为正方形，且设有圆角；或进口通道1的横截面为正方形，且相邻两条边由两条连接线连接，两条连接线之间为钝角；或进口通道1的横截面为正方形，且相邻两条边由两条连接线和圆弧连接，圆弧处于两条连接线之间，两条连接线之间为钝角。
蜂窝陶瓷过滤器具有进口通道1，让尾气进入；也具有出口通道2，让尾气流出。对进口通道1来说，其出口端被封堵，而进口端不堵；对出口通道2来说，其进口端被封堵，而出口端不堵。进口及出口通道2由多孔的壁隔开。一般来说，壁的气孔率在20％到70％之间。对汽油机及柴油机尾气过滤器，气孔平均尺寸在5到50微米间，优选10到30微米间。蜂窝陶瓷过滤器每平方英寸有50到350个格子，优选100到300个格子。壁厚可从0.05到0.5毫米，优选0.1到0.4毫米。
具体的，本发明的过滤器具有皮肤，此过滤器可以是圆形、椭圆形或其他形状。过滤器的组成是一系列的相互连接的多孔的壁构成的进口及出口通道2。进口及出口通道2一直延伸到整个过滤器的长度。此过滤器由挤出工艺形成。一般来说，此过滤器的材料是陶瓷材料，如堇青石，碳化硅，钛酸铝，及莫来石等，但也可是其它可挤出的材料，如玻璃，玻璃陶瓷，塑料，以及金属。
其中，进口通道1的内径与出口通道2的内径的比例范围为1.1-1.5。优选地，其比例范围为1.2-1.4。
本发明提供的一种抗热震非对称蜂窝陶瓷壁流式过滤器，对进口通道横截面进行圆角、双线或双线加圆弧改造，本过滤器具有兼顾良好的力学性能、低背压以及优异的抗热震性能。
以下实施例为本发明的几种情况。
实施例1：
如图1-图2所示，进口通道1的横截面为正方形，且设有圆角，相邻进口通道1的圆角之间的距离与壁厚的比例范围为0.8-1.4，优选地，其比例范围为0.9-1.3。优选地，圆角的半径大于壁厚的20％，且小于0.3mm。出口通道2的横截面为正方形。
实施例2：
如图3-图5所示，进口通道1的横截面为正方形，且设有圆角，相邻进口通道1的圆角之间的距离与壁厚的比例范围为0.8-1.4，优选地，其比例范围为0.9-1.3。优选地，圆角的半径大于壁厚的20％，且小于0.3mm。出口通道2的横截面为正方形，并设有圆角，圆角的半径大于壁厚的20％，且小于0.3mm。
实施例3：
如图6-图8所示，进口通道1的横截面为正方形，且设有圆角，相邻进口通道1的圆角之间的距离与壁厚的比例范围为0.8-1.4，优选地，其比例范围为0.9-1.3。优选地，圆角的半径大于壁厚的20％，且小于0.3mm。出口通道2的横截面为正方形，且设有倒角，所述倒角的斜边长度范围为所述出口通道2的横截面边长的5％-30％，优选地，倒角可为45°角，也可以为斜切角等。
实施例4：
如图9-10所示，进口通道1的横截面为正方形，且相邻两条边由两条连接线连接，两条连接线之间为钝角，其连接线与其相连的正方形边的夹角小于30°，优选地，夹角小于15°，根据实际需求，可选用更小的夹角。出口通道2的横截面为正方形。
实施例5：
如图11-13所示，进口通道1的横截面为正方形，且相邻两条边由两条连接线连接，两条连接线之间为钝角，其连接线与其相连的正方形边 的夹角小于30°，优选地，夹角小于15°，根据实际需求，可选用更小的夹角。出口通道2的横截面为正方形，并设有圆角，圆角的半径大于壁厚的20％，且小于0.3mm。
实施例6：
如图14-图16所示，进口通道1的横截面为正方形，且相邻两条边由两条连接线连接，两条连接线之间为钝角，其连接线与其相连的正方形边的夹角小于30°，优选地，夹角小于15°，根据实际需求，可选用更小的夹角。出口通道2的横截面为正方形，且设有倒角，所述倒角的斜边长度范围为所述出口通道2的横截面边长的5％-30％，优选地，倒角可为45°角，也可以为斜切角等。
实施例7：
如图17-图18所示，进口通道1的横截面为正方形，且相邻两条边由两条连接线和圆弧组成的连接部连接，圆弧处于两条连接线之间，两条连接线之间为钝角，圆弧长度小于连接部长度的30％，优选地，长度小于15％。出口通道2的横截面为正方形。
实施例8：
如图19-图21所示，进口通道1的横截面为正方形，且相邻两条边由两条连接线和圆弧组成的连接部连接，圆弧处于两条连接线之间，两条连接线之间为钝角，圆弧长度小于连接部长度的30％，优选地，长度小于15％。出口通道2的横截面为正方形，并设有圆角，圆角的半径大于壁厚的20％，且小于0.3mm。
实施例9：
如图22-图24所示，进口通道1的横截面为正方形，且相邻两条边由两条连接线和圆弧组成的连接部连接，圆弧处于两条连接线之间，两条连接线之间为钝角，圆弧长度小于连接部长度的30％，优选地，长度小于15％。出口通道2的横截面为正方形，且设有倒角，所述倒角的斜边长度范围为所述出口通道2的横截面边长的5％-30％，优选地，倒角可 为45°角，也可以为斜切角等。
依据以上实施例，将进口通道1及出口通道2的结构设计组合起来，从而改善背压，增加力学及热力学强度。优选地，以上实施例的进口通道1的横截面可以为正方形。
本发明提供的一种抗热震非对称蜂窝陶瓷壁流式过滤器，对进口通道1横截面进行圆角、双线或双线加圆弧改造，进一步结合对出口通道2横截面正方、倒角或圆角改造，本过滤器具有兼顾良好的力学性能、低背压以及优异的抗热震性能。
以上仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (9)

  1. 一种抗热震非对称蜂窝陶瓷壁流式过滤器，其特征在于，包括：进口蜂窝陶瓷面和出口蜂窝陶瓷面，所述进口蜂窝陶瓷面和所述出口蜂窝陶瓷面均设有进口通道(1)和出口通道(2)，所述进口通道(1)与所述出口通道(2)连通，所述进口通道(1)的出口端和所述出口通道(2)的进口端封堵，所述进口通道(1)的内径大于所述出口通道(2)的内径；所述进口通道(1)的横截面为正方形，且设有圆角；或所述进口通道(1)的横截面为正方形，且相邻两条边由两条连接线连接，所述两条连接线之间为钝角；或所述进口通道(1)的横截面为正方形，且相邻两条边由两条连接线和圆弧连接，所述圆弧处于所述两条连接线之间，所述两条连接线之间为钝角。
  2. 如权利要求1所述的抗热震非对称蜂窝陶瓷壁流式过滤器，其特征在于，所述进口通道(1)的内径与所述出口通道(2)的内径的比例范围为1.1-1.5。
  3. 如权利要求1或2所述的抗热震非对称蜂窝陶瓷壁流式过滤器，其特征在于，所述进口通道(1)的横截面为正方形，且设有圆角，相邻所述进口通道(1)的圆角之间的距离与壁厚的比例范围为0.8-1.4。
  4. 如权利要求3所述的抗热震非对称蜂窝陶瓷壁流式过滤器，其特征在于，所述进口通道(1)的横截面为正方形，且设有圆角，所述圆角的半径大于壁厚的20％，且小于0.3mm。
  5. 如权利要求1或2所述的抗热震非对称蜂窝陶瓷壁流式过滤器，其特征在于，所述进口通道(1)的横截面为正方形，且相邻两条边由两条依次连接的连接线连接，所述两条连接线之间为钝角，且所述连接线与其相连的正方形边的夹角小于30°。
  6. 如权利要求1或2所述的抗热震非对称蜂窝陶瓷壁流式过滤器，其特征在于，所述进口通道(1)的横截面为正方形，且相邻两条边由两条连接线和圆弧组成的连接部连接，所述圆弧处于所述两条连接线之间， 所述两条连接线之间为钝角，所述圆弧长度小于所述连接部长度的30％。
  7. 如权利要求3-6中任意一项所述的抗热震非对称蜂窝陶瓷壁流式过滤器，其特征在于，所述出口通道(2)的横截面为正方形。
  8. 如权利要求3-6中任意一项所述的抗热震非对称蜂窝陶瓷壁流式过滤器，其特征在于，所述出口通道(2)的横截面为正方形，并设有圆角，所述圆角的半径大于壁厚的20％，且小于0.3mm。
  9. 如权利要求3-6中任意一项所述的抗热震非对称蜂窝陶瓷壁流式过滤器，其特征在于，所述出口通道(2)的横截面为正方形，且设有倒角，所述倒角的斜边长度范围为所述出口通道(2)的横截面边长的5％-30％。
PCT/CN2018/116702 2017-12-27 2018-11-21 一种抗热震非对称蜂窝陶瓷壁流式过滤器 WO2019128559A1 (zh)

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