WO2017090587A1 - 粒子状物質の測定装置用部品およびその製造方法 - Google Patents
粒子状物質の測定装置用部品およびその製造方法 Download PDFInfo
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- WO2017090587A1 WO2017090587A1 PCT/JP2016/084551 JP2016084551W WO2017090587A1 WO 2017090587 A1 WO2017090587 A1 WO 2017090587A1 JP 2016084551 W JP2016084551 W JP 2016084551W WO 2017090587 A1 WO2017090587 A1 WO 2017090587A1
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- particulate matter
- filter
- flow path
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
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- 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
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- G01N15/06—Investigating concentration of particle suspensions
- G01N15/0606—Investigating concentration of particle suspensions by collecting particles on a support
- G01N15/0618—Investigating concentration of particle suspensions by collecting particles on a support of the filter type
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- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
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- B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
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- 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
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- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
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- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
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- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a part for a particulate matter measuring device and a manufacturing method thereof.
- Patent Document 1 As a part for a particulate matter measuring device used for measuring the amount of particulate matter in exhaust gas discharged from a diesel engine, for example, in Japanese Unexamined Patent Application Publication No. 2014-159783 (hereinafter referred to as Patent Document 1). The ones described are known.
- the particulate matter measuring device component described in Patent Document 1 sandwiches a cell when a filter partitioned into a plurality of cells by a porous partition and at least one cell is a measuring cell. And a pair of electrodes.
- the amount of particulate matter deposited in the exhaust gas collected by the filter is calculated based on the capacitance between the pair of electrodes.
- the particulate matter measuring device component comprises a base made of ceramics and having a flow path through which gas flows, and a filter part made of porous ceramics provided inside the flow path so as to divide the flow path into a plurality of parts. And a pair of electrodes for forming a capacitance provided so as to sandwich the filter portion between the base portion, and the wall surface of the flow path of the base portion is denser than the surface of the filter portion.
- FIG. 1 It is a perspective view of the part for measuring devices of particulate matter. It is sectional drawing which shows the longitudinal cross-section of the component for measuring apparatuses of the particulate matter shown in FIG. It is sectional drawing which shows the cross section of the component for measuring apparatuses of the particulate matter shown in FIG. It is a schematic diagram which shows the wiring pattern of the electrode in the components for measuring apparatuses of the particulate matter shown in FIG. It is a schematic diagram which shows the wiring pattern of the electrode in the modification of the components for measuring devices of a particulate matter. It is sectional drawing which shows the longitudinal cross-section of the modification of the components for measuring devices of a particulate matter.
- (A) is a perspective view of a modified example of a part for a particulate matter measuring device
- (b) is a cross-sectional view taken along the line CC (longitudinal section) of (a)
- (c) is ( It is sectional drawing which shows the DD sectional view (longitudinal section) of a).
- FIG. 1 is a perspective view showing a configuration of a particulate matter measuring device component 100.
- the particulate matter measuring device component 100 includes a base 1 having a flow channel 11 therein and a filter unit 2 provided inside the flow channel 11.
- the particulate matter measuring device component 100 further includes a pair of electrodes 3 for forming a capacitance on the base 1.
- the particulate matter measuring device component 100 is used, for example, to measure the amount of particulate matter in exhaust gas discharged from a diesel engine.
- the base 1 is a member for forming a gas flow path 11.
- the base 1 is made of, for example, an insulating ceramic such as alumina.
- the base 1 has, for example, one or a plurality of flow paths 11 inside.
- the base 1 has a rectangular parallelepiped shape and includes two flow paths 11 therein.
- the channel 11 extends along the longitudinal direction of the main surface of the base 1.
- Each flow path 11 is divided into a plurality by the filter unit 2, and each of the divided spaces is also called a divided flow path 12.
- the flow path 11 is open to one side surface of the base 1 and a side surface at a position facing the one side surface.
- the two flow paths 11 are arranged in the thickness direction of the base 1.
- the length of the main surface in the longitudinal direction can be set to 40 mm
- the length (width) in the short direction can be set to 10 mm
- the thickness can be set to 5 mm.
- segmentation flow path 12 (division flow path 12 between the filter parts 2) divided by the filter part 2 can set a width
- interval of a bottom face and a ceiling surface can be set to 1.2 mm.
- the length of the channel 11 is equal to the length of the base 1 and can be set to 40 mm.
- the filter unit 2 is a member for collecting particulate matter in the gas. As shown in FIG. 2, the filter unit 2 is provided inside the flow path 11. As shown in FIG. 3, in the particulate matter measuring device component 100, the filter unit 2 is plate-shaped and is provided along the longitudinal direction of the base 1 (along the length direction of the flow path 11). It has been. A plurality of filter units 2 are provided so as to divide the channel 11 of the base 1 into a plurality of regions (divided channels 12). The particulate matter measuring device component 100 is provided with four filter sections 2 for each flow path 11. Each of the four filter units 2 is arranged in parallel.
- the filter part 2 consists of porous ceramics. Examples of porous ceramics include porous alumina. Since the filter part 2 is made of porous alumina, the gas flowing through the flow path 11 can pass through the filter part 2. At this time, the filter unit 2 can collect (deposit) a part of the particulate matter contained in the gas.
- the wall surface of the flow path 11 of the base portion 1 is denser than the surface of the filter portion 2.
- the particulate matter deposition can be easily concentrated on the filter unit 2, and the linearity between the particulate matter deposition amount and the measured value can be increased.
- the measurement accuracy of the particulate matter measuring device component 100 can be improved.
- the wall surface of the channel 11 of the base portion 1 is denser than the surface of the filter portion 2.
- the wall surface of the channel 11 of the base 1 and the surface of the filter unit 2 are observed using a scanning electron microscope (SEM).
- SEM scanning electron microscope
- image processing is performed on the obtained SEM image to determine the surface porosity.
- the porosity of the wall surface of the flow path 11 of the base 1 can be set to 3% or less, for example.
- the porosity of the surface of the filter unit 2 can be set to 40 to 70%, for example.
- the wall surface of the flow path 11 here means the whole inner surface of the base 1 facing the gas in the flow path 11. That is, not only the inner surface of the flow path 11 but also the ceiling surface and the bottom surface are included in the wall surface here.
- the wall surface of the channel 11 of the base 1 is denser than the surface of the filter unit 2” here means that only the ceiling surface and the bottom surface of the channel 11 are denser than the surface of the filter unit 2. Also included. Also in this case, it is possible to make it difficult to deposit the particulate matter on the ceiling surface and the bottom surface of the flow path 11 of the base portion 1 and to make it easier to deposit the particulate matter on the surface of the filter portion 2. As a result, the particulate matter deposition can be easily concentrated on the filter unit 2, and the linearity between the particulate matter deposition amount and the measured value can be increased.
- the porosity of the wall surface of the flow path 11 of the base 1 By setting the porosity of the wall surface of the flow path 11 of the base 1 to 3% or less, it is possible to make it difficult for particulate matter to enter the base 1. As a result, the possibility that the particulate matter adheres to the electrode 3 can be reduced, so that the electrostatic capacitance between the electrodes 3 may not be correctly measured when the particulate matter adheres to the electrode 3. Can be reduced. As a result, the measurement accuracy of the particulate matter measurement device component 100 can be further improved.
- the base part 1 and the filter part 2 are integrally formed. Since the base portion 1 and the filter portion 2 are integrally formed, the long-term reliability of the particulate matter measuring device component 100 can be improved. Specifically, in the case where the base 1 and the filter unit 2 are joined after being formed separately, for example, there is a possibility that peeling occurs from the interface between the base 1 and the filter unit 2. In particular, when a bonding material or the like is used for bonding, the filter material 2 may not be correctly fixed to the base 1 due to deterioration of the bonding material. On the other hand, by integrally forming (firing) the base 1 and the filter part 2, it is possible to reduce the possibility of deterioration from the interface between the base 1 and the filter part 2.
- the base 1 and the filter 2 are made of the same ceramic, the thermal expansion coefficients of the base 1 and the filter 2 can be made closer. Thereby, the long-term reliability of the particulate matter measuring device component 100 under a heat cycle can be improved.
- “consisting of the same ceramics” means that the main components (components occupying 80% by mass or more) of the ceramics constituting the base portion 1 and the filter portion 2 are the same.
- the base 1 and the filter 2 are made of alumina.
- alumina is easy to adjust the surface porosity as shown below.
- the base portion 1 having a surface with a porosity of 3% or less and the filter portion 2 having a surface with a porosity of about 40 to 70% can be integrally formed by the following method, for example.
- a ceramic paste containing 93% by mass of alumina powder and 7% by mass of a resin binder is used for the part to be the base 1.
- a ceramic paste containing 55% by mass of alumina powder, 38% by mass of a pore former and 7% by mass of a resin binder is used.
- These ceramic pastes are processed into green sheets of a predetermined shape using a doctor blade method.
- the capacitance forming electrode 3 can be formed by printing a conductive paste on the green sheet. And these green sheets are pressure-laminated using a uniaxial press.
- the filter portion 2 and the base portion 1 having the above porosity can be formed by firing at 1500 ° C.
- the dimensions of the filter portion 2 are, for example, a length along the width direction of the base portion 1 of 0.3 mm, and a length along the thickness direction of the base portion 1 equal to the distance between the bottom surface of the flow path 11 and the ceiling surface.
- the length along the length direction of the base 1 can be set to 40 mm.
- the electrode 3 is a member for forming a capacitance. As shown in FIG. 2, the electrodes 3 are provided in pairs so that the filter portion 2 is sandwiched between the base portion 1. More specifically, when a plurality of flow paths 11 are provided as in the particulate matter measuring device component 100, the electrodes 3 are arranged so as to sandwich the filter portions 2 positioned in the respective flow paths 11. Is provided. For example, the electrode 3 may be provided so as to cover the plurality of filter units 2, or may be provided so as to correspond to each of the filter units 2. And as shown in FIG.
- the electrode 3 when the two flow paths 11 are provided in the up-down direction like the particulate matter measuring device component 100, the electrode 3 is located above the upper flow path 11, It may be located between the upper flow path 11 and the lower flow path 11 and below the lower flow path 11.
- the electrode 3 positioned between the upper flow path 11 and the lower flow path 11 can form a capacitance with the electrode 3 above the upper flow path 11, and Capacitance can be formed between the lower flow path 11 and the lower electrode 3.
- a capacitance is formed between the pair of electrodes 3 sandwiching the filter unit 2.
- the capacitance between the pair of electrodes 3 changes.
- an external detection device it is possible to measure the amount of particulate matter accumulated in the filter unit 2.
- the electrode 3 is embedded in the base 1. Thereby, the possibility that the electrode 3 may be affected by gas corrosion or the like can be reduced. Moreover, since the possibility that particulate matter or the like adheres to the surface of the electrode 3 can be reduced, the measurement accuracy of the particulate matter measuring device component 100 can be improved.
- the electrode 3 is provided (embedded) inside the base 1 but is not limited thereto. Specifically, the position where the electrode 3 is provided may be, for example, the outer surface of the base 1 (a surface other than the wall surface of the flow path 11).
- the electrode 3 has, for example, a linear wiring pattern and is provided along the filter unit 2.
- the linearity between the amount of the particulate matter collected in the filter part 2 and the change in the capacitance between the electrodes 3 is improved. be able to.
- the shape of the electrode 3 when viewed in plan is not limited to a linear shape, and may be, for example, a circular shape or a rectangular shape.
- the electrode 3 by making the electrode 3 into a linear wiring pattern, the resistance value can be increased as compared with the case where the electrode 3 is made circular or rectangular. Therefore, it is possible to function as a heater by applying a high voltage to the electrode 3. Thereby, the particulate matter collected by the filter part 2 can be removed by heating.
- a direct current may be passed or an alternating current may be passed.
- the migration that occurs in the electrode 3 can be reduced by flowing an alternating current, the long-term reliability of the particulate matter measuring device component can be improved.
- the electrode 3 has a linear wiring pattern, and is provided in a region of the base portion 1 that sandwiches the filter portion 2 and a region that does not sandwich the filter portion 2.
- a portion of the electrode 3 located in a region where the filter unit 2 is not sandwiched may be narrower than a portion located in a region where the filter unit 2 is sandwiched.
- the width of the portion of the electrode 3 located in the region sandwiching the filter unit 2 is secured to form a good capacitance between the electrodes 3, while the electrode 3 is positioned in the region not sandwiching the filter unit 2
- the resistance value can be increased by narrowing the width of the portion.
- each of the pair of electrodes 3 sandwiching the filter unit 2 has a meander shape meandering by connecting ends of portions provided along each of the plurality of filter units 2. This is a single linear wiring pattern. And the edge part of the one electrode is pulled out by the outer surface of the base 1, and each of a pair of electrode 3 becomes one line of wiring.
- the electrode 3 for example, a metal material such as platinum or tungsten can be used. Further, when the electrode 3 has a linear wiring pattern, for example, the width can be set to 2 mm, the length can be set to 38 mm, and the thickness can be set to 30 ⁇ m.
- the base 1 has a shape having the flow path 11 inside, but is not limited thereto. Specifically, for example, as shown in FIG. 6, a space between the pair of base portions 1 and the pair of base portions 1 is separated from the pair of base portions 1 which are plate-shaped members made of ceramics and are arranged so that the main surfaces face each other.
- a filter portion 2 made of porous ceramics provided so as to form a flow path, and a pair of electrodes for forming a capacitance provided on the pair of base portions 1 so as to sandwich the filter portion 2 therebetween. 3 and the opposing main surfaces of the pair of base portions 1 may be denser than the surface of the filter portion 2.
- the flow path 11 is formed by dividing the space between the base portion 1 and the base portion 1 by the filter portion 2.
- the amount of the particulate matter can be measured by collecting the particulate matter in the flow path 11 and collecting the particulate matter by the filter unit 2 and detecting the change in the capacitance between the electrodes 3.
- the measurement accuracy can be improved in the same manner as the particulate matter measuring device part 100 described above.
- three bases 1 are provided side by side with two spaces therebetween, and six each of these two spaces are provided.
- a filter unit 2 is provided.
- the number of the base portions 1 may be two or three or more, and the number of the filter portions 2 can be appropriately changed.
- the filter portion 2 also serves as a side wall, but the base portion 1 in contact with the filter portion 2 may be provided as a side wall outside the outer filter portion 2.
- the outer filter portion 2 is disposed so as to be in contact with the side wall of the base portion 1.
- the end of the flow path 11 is open, but the present invention is not limited to this.
- the end of the flow path 11 may be partially sealed by the sealing portion 4.
- one end of the flow channel 11 is partially open, and a portion of the other end facing the open portion of one end is sealed. It is preferable that one end portion of the first end portion is partially sealed and a portion of the other end portion that faces the sealed portion of one end portion is open.
- the sealing portion 4 for example, a resin material such as a fluororesin can be used.
- the other sealing portion 4 may be made of the same ceramic as the filter portion 2 or the base portion 1.
- the filter portion 2 may be made of ceramics and may be integrally formed (fired) together with the base portion 1 and the sealing portion 4. Thereby, a possibility that deterioration may arise from the interface of the sealing part 4 and the base 1 or the sealing part 4 and the filter part 2 can be reduced.
- the particulate matter measuring device part 100 shown in FIGS. 8 to 10 has a plurality of filters 2 having different degrees of porosity. Particulate material measuring device part 100 that can know the particle size distribution of particulate matter, and particulate material measuring device part 100 that can collect particulate matter continuously for a long time and have a long life. , It can be more value-added.
- the filter portion 2 made of porous ceramics has three types of filter portions 2a, 2b, and 2c having different pore sizes and pore diameters.
- the example shown in FIG. 8 includes a first filter portion 2a having a relatively large pore diameter, a third filter portion 2c having a small pore diameter, and a second filter portion 2b having an intermediate pore diameter. ing.
- the particulate substances collected by the filter portions 2a, 2b, and 2c have different average particle sizes. . Therefore, the particle size distribution of the particulate matter collected from the capacitance detected by the electrodes 3 sandwiching each of the plurality of filter portions 2a, 2b, and 2c having different pore diameters is known.
- the exhaust gas containing particulate matter It is possible to infer the combustion state in the engine that discharges gas and the state of the PM filter located upstream of the particulate matter measuring device component 100.
- the plurality of filter portions 2a, 2b, 2c having different pore diameters are arranged in the order of the pore diameter.
- the filter unit 2 has a three-stage space (flow path 11) arranged in the vertical direction of the drawing, and the first filter unit 2 a is arranged in the upper stage, and the middle stage.
- the second filter unit 2b is disposed in the lower part, and the third filter unit 2c is disposed in the lower stage. That is, the filter portions 2 having the same pore diameter are arranged in a row at each stage.
- the electrodes 3 sandwiching the filter portions 2 having the same pore diameter can be arranged side by side, and these can be combined into one as in the example shown in FIG.
- the type of pore size of the filter unit 2 is not limited to three, and may be two or four or more. Further, in the example shown in FIG. 8, the filter portions 2 having the same pore diameter are arranged in a row in the horizontal direction, but may be arranged in a row in the vertical direction. Although they may be arranged randomly, they may be arranged in a line as described above.
- the pore diameter here is an average pore diameter.
- the pore diameter may be calculated by taking an SEM image of the surface or cross section of the filter portion 2 and calculating an average pore diameter for pores within the range of the SEM image by image analysis.
- the SEM magnification is 100 times and may be performed using an SEM image having a field of view of 1.0 mm ⁇ 1.3 mm.
- the pore diameter of the filter unit 2 is, for example, 1 ⁇ m to 60 ⁇ m. If the filter part 2 has three types of filter parts 2a, 2b, 2c having different pore diameters as in the above example, for example, the pore diameter of the first filter part 2a is 10 ⁇ m to 60 ⁇ m, The pore diameter of the filter portion 2b may be 5 ⁇ m to 30 ⁇ m, and the pore diameter of the third filter portion 2c may be 1 ⁇ m to 15 ⁇ m.
- the filter portion 2 made of porous ceramics has two types of filter portions 2d and 2e having different porosities.
- the example shown in FIGS. 9 and 10 includes a fourth filter portion 2d having a relatively high porosity and a fifth filter portion 2e having a relatively low porosity.
- the porosity of the filter part 2 located outside is larger than the porosity of the filter part 2 located inside.
- the fourth filter portion 2 d is disposed on the outer side
- the fifth filter portion 2 e is disposed on the inner side.
- the fourth filter portion 2d is arranged outside in the vertical direction, and the fifth filter portion 2e is arranged inside.
- Three-stage spaces (channels 11) are arranged in the vertical direction of the drawing, the fourth filter portion 2d is arranged in the upper and lower spaces (channels 11), and the middle-stage space (channel 11).
- a fifth filter unit 2e is arranged.
- the fourth filter portion 2d is arranged outside in the left-right direction of the drawing, and the fifth filter portion 2e is arranged inside.
- Three-stage spaces (channels 11) are arranged in the vertical direction, and six filter sections 2 are arranged in the left and right directions in the respective spaces. Of the six filter units 2, the two on the left and the right are the fourth filter units 2d, and the two located between these are the fifth filter units 2e.
- the central portion of the space in the particulate matter measuring device component 100, the central portion of the space (inside the cross section perpendicular to the length direction of the flow path 11)
- the flow rate of the gas flowing through the region tends to be larger than the flow rate of the gas flowing through the outer periphery of the space (the outer region in a cross-sectional view perpendicular to the length direction of the flow path 11).
- the inner filter portion 2 collects more particulate matter than the outer filter portion 2, and the clogging of the particulate matter is also accelerated. If the clogging of the particulate matter is fast, the frequency of performing the regeneration for removing the particulate matter by heating with the heater is increased, so that the deterioration of the particulate matter measuring device component 100 is also accelerated.
- the porosity of the filter part 2 (the fourth filter part 2d) located outside is the filter part 2 located inside.
- the porosity of the (fifth filter portion 2e) is larger, the gas tends to flow toward the filter portion 2 (fourth filter portion 2d) having a larger porosity, and in a cross section perpendicular to the length direction of the flow path.
- the gas flow rate difference depending on the position becomes small. Therefore, since only the inner filter part 2 is not quickly clogged with particulate matter, it is possible to collect particulate matter continuously for a long time, and the long-life particulate matter measuring device component 100 and become.
- the porosity of the filter unit 2 located on the outer side in the vertical direction and the outer side in the left-right direction is the filter unit 2 (fifth filter unit) located on the inner side. 2e)
- the porosity of the filter part 2 located on the outer side in the vertical and horizontal directions and the outer periphery in the cross-section is combined in the center in the vertical and horizontal directions and in the center in the cross-section. It may be larger than the porosity of the filter part 2 located.
- the base 1 and the filter unit 2 are alternately arranged in the vertical direction, as in the example shown in FIG. 9, the fourth filter unit 2d is arranged on the outer side in the vertical direction, and the fifth on the inner side.
- the structure in which the filter portion 2e is disposed can be easily manufactured by a manufacturing method as described later.
- Examples of the porosity measurement method for comparing the porosity of the filter unit 2 include a mercury intrusion method (JIS standard R1655: 2003), image analysis of SEM images, and the like.
- the image analysis of the SEM image can be performed by taking a SEM image of a cross section of the filter unit 2 and calculating the area ratio of the pores within the range of the SEM image by image analysis.
- the SEM magnification is 100 times, and an SEM image having a field of view of 1.0 mm ⁇ 1.3 mm may be used.
- the porosity of the filter unit 2 is 40 to 70%
- the porosity of the filter unit 2d having a relatively high porosity and the filter unit 2e having a relatively low porosity are 50 to 70% and 40 to 60, respectively. %And it is sufficient.
- the manufacturing method of the particulate matter measuring device component includes a step of preparing a plurality of first ceramic green sheets 12, a step of preparing a plurality of second ceramic green sheets 22, and a first ceramic green sheet 12. Forming the electrode layer 32 on the second ceramic green sheet 22, forming the through hole 112 in the second ceramic green sheet 22, and forming the first ceramic green sheet 12 on which the electrode layer 32 is formed and the first through hole 112.
- the method includes a step of laminating two ceramic green sheets 22 to form a laminate 102 and a step of firing the laminate 102.
- the particulate material measuring device part 100 as described above, in which the dense base portion 1 made of ceramics and the filter portion 2 made of porous ceramics are integrally formed, is manufactured. can do.
- each of the pair of electrodes 3 may be configured by two meander-shaped linear wiring patterns and may be two lines of wiring.
- the two wiring patterns are arranged side by side in the width direction of the flow path 11
- the two wiring patterns are arranged side by side in the length direction of the flow path 11. ing.
- each of the pair of electrodes 3 arranged with the filter unit 2 interposed therebetween is configured as two lines of wiring, so that the particulate matter is detected by the electrode 3 of one line and the other line is detected.
- the particulate matter collected by the electrode 3 can be removed. Therefore, the particulate matter can be continuously detected without stopping the particulate matter detection for removing the particulate matter.
- each of the pair of electrodes 3 arranged with the filter unit 2 interposed therebetween is a two-line wiring, but is not limited thereto. For example, three or more lines may be used.
- FIG. 13 is a schematic diagram showing a method for manufacturing a particulate matter measuring device part for each step.
- a plurality of first ceramic green sheets 12 and a plurality of second ceramic green sheets 22 are prepared.
- the first ceramic green sheet 12 is a part that becomes a base 1 by sintering in a subsequent firing step
- the second ceramic green sheet 22 is a part that also becomes a filter part 2.
- the filter part 2 is made of porous ceramics. Therefore, the second ceramic green sheet 22 has a larger number of pores (the porosity becomes larger) when sintered in the subsequent firing step with respect to the first ceramic green sheet 12.
- the second ceramic green sheet 22 contains more components that become pores when sintered in the firing step than the first ceramic green sheet 12. Specifically, those having a large organic binder component, those containing a pore former, and the like. Alternatively, in order to decrease the sinterability and increase the pores, there are few sintering aid components.
- the pore former is in the form of particles that are burned off in the subsequent firing step.
- the pore former include acrylic resin beads (methacrylic ester copolymer), carbon powder, and crystalline cellulose.
- the pore former may have a particle diameter of 1 to 1.2 times the pore diameter of the filter portion 2.
- a pore former having an average particle diameter of 1 ⁇ m to 72 ⁇ m may be used. The porosity can be adjusted by adjusting the particle size and amount of the pore former.
- the first ceramic green sheet 12 is made of an alumina ceramic
- an organic binder such as an acrylic resin and an alumina powder and a sintering aid (a powder of SiO 2 , MgO, CaO, etc.) are used.
- an organic solvent such as toluene or acetone and a solvent such as water are mixed to prepare a slurry.
- the slurry may be used to form a sheet by a film forming method such as a doctor blade method.
- the second ceramic green sheet 22 may be a slurry obtained by adding a pore former to the slurry for the first ceramic green sheet 12.
- the second ceramic green sheet 22 includes a pore former with respect to the first ceramic green sheet 12.
- the filter part 2 has different pore diameters, for example, as the pore former added to the slurry for the second ceramic green sheet 22, those having different average particle diameters are used. What is necessary is just to produce several types of 2nd ceramic green sheets 22 from which an average particle diameter differs.
- the filter unit 2 has different porosity, for example, the amount of pore forming material added to the slurry for the second ceramic green sheet 22 is different from each other, the average particle size of the included pore forming material is different, A plurality of types of second ceramic green sheets 22 may be produced.
- an electrode layer 32 is formed on the first ceramic green sheet 12 as in the example shown in FIG.
- the electrode layer 32 is sintered in the subsequent firing step to become the electrode 3.
- the electrode layer 32 may be formed by applying a metal paste mainly composed of a metal material such as platinum or tungsten which is the main component of the electrode 3 on the first ceramic green sheet 12.
- the metal paste can be prepared by adding a resin binder and a solvent to a metal material powder and kneading. What is necessary is just to apply
- the through-hole 112 is formed in the second ceramic green sheet 22.
- the through hole 112 is a portion that becomes the flow path 11.
- the through holes 112 may be formed in the second ceramic green sheet 22 by punching using a mold or laser processing.
- the first ceramic green sheet 12 in which the electrode layer 32 is formed and the second ceramic green sheet 22 in which the through-hole 112 is formed are laminated to form a laminate. 102 is formed.
- the portions to be the three substrates 1 are each formed by laminating two layers of the first ceramic green sheets 12, and the portion to be the filter portion 2 is the two layers of the second ceramic.
- the green sheet 22 is formed by being laminated. In either case, a ceramic green sheet having one layer or three or more layers may be used.
- the example shown in FIG. 13 (d) is a laminate 102 in the case where the electrode 3 as in the example shown in FIG. 32 is located between the two layers of the first ceramic green sheet 12. On the first ceramic green sheet 12 on which the electrode layer 32 is formed, the first ceramic green sheet 12 on which the electrode layer 32 is not formed is laminated.
- the first electrode layer 32 is not formed on the first ceramic green sheet 12 on which the electrode layer 32 is formed.
- the ceramic green sheets 12 are stacked, only the portion of the second ceramic green sheet 22 that becomes the filter portion 2 is stacked, and further the frame-shaped first ceramic green sheet 12 is stacked so as to surround the periphery. Good.
- the first ceramic green sheet 12 may be further attached to the side surface of the laminate 102 as shown in FIG. Or what is necessary is just to make it the inner surface of said frame-shaped 1st ceramic green sheet 12 contact the part used as the filter part 2 located in the outer side of the 2nd ceramic green sheet 22.
- the first ceramic green sheet 12 on which the electrode layer 32 is formed and the second ceramic green sheet 22 on which the through hole 112 is formed are overlapped and applied by a uniaxial pressure press or the like. What is necessary is just to integrate by pressing and pressing.
- the through holes 112 are filled with a resin or the like that will be burned off in the subsequent firing step, deformation of the portions of the first ceramic green sheet 12 located above and below the through holes can be suppressed.
- the firing temperature may be 1500 ° C. to 1600 ° C. when the base portion 1 and the filter portion 2 are made of alumina ceramics.
- interval of the adjacent filter parts 2 located in the center side (center part) of the flow path 11 is adjacent to the edge part side (outer peripheral part) of space (flow path 11). It may be larger (wider) than the interval between the matching filter parts 2.
- the flow rate of the gas flowing through the central portion of the flow path 11 tends to be larger than the flow rate of the gas flowing through the outer peripheral portion. Therefore, by increasing the interval between the filter portions 2 in this central portion, It can flow smoothly.
- the thickness of the filter part 2 located on the center side (center part) of the space (flow path 11) is equal to that of the filter part 2 located on the end side (outer peripheral part) of the flow path 11. It may be smaller than the thickness.
- the electrode 3 is provided up to the end of the base 1 (for example, the electrode 31 is provided at the upper right end of the base 1).
- the formation of the electrode 3 (31 or the like) at the end of the base 1 is dependent on the width of the base 1 in order to secure an insulation distance from the outside, depending on the magnitude of the voltage applied to the electrode 3. There is a case where it is necessary to improve such as increasing.
- the thickness of the filter unit 2 positioned on the center side of the flow path 11 is the thickness of the filter unit 2 positioned on the end side of the flow path 11 ( You may make it a structure smaller than the width
- the base 1 is deformed so as to be recessed inward due to the pressure difference (atmospheric pressure difference) between the inside (the inside of the flow path 11) and the outside of the particulate matter measuring device component 100. Even if it occurs, the thermal stress caused by this deformation can be reduced. Specifically, the deformation of the base portion 1 tends to increase as it is closer to the center side of the flow path 11. By reducing the thickness of the filter portion 2 on the center side where the deformation is large, the thermal stress can be absorbed by bending the filter portion 2. Thereby, durability of the part 100 for particulate matter measuring devices can be improved.
- the gas easily flows to the end side.
- the gas originally tends to flow toward the center side.
- the gas can be easily flowed toward the end side.
- the fact that the gas flow rate approaches uniformly means that the amount of particulate matter collected in each of the filter units 2 also approaches uniformly.
- the time required to remove the particulate matter by heating can be shortened. Thereby, the long-term reliability of the particulate matter measuring device component 100 can be improved.
- the thickness of the filter unit 2 decreases as the distance from the center increases.
- the thickness of the filter unit 2 located on the outermost periphery is not limited to this.
- the “filter portion 2 located on the outermost periphery among the filter portions 2 other than the filter portion 2 located on the outermost periphery” is thicker than the “filter portion 2 located on the outermost periphery”. .
- the gas easily escapes from the outermost filter part 2 to the outside while reducing the gas flow rates in the respective flow paths 11 to be uniform. Therefore, the flow rate of the gas in each flow path 11 can be made close to uniform while ensuring the amount of gas passing through the particulate matter measuring device component 100.
- the shape which the wall surface which faces the flow path 11 among the filter parts 2 was depressed may be sufficient.
- the wall surface facing the flow path 11 in the filter unit 2 may have a shape in which the center is recessed in an arc shape.
- the outer wall surface of the filter unit 2 located on the outermost periphery among the plurality of filter units 2 is recessed. It may be. More specifically, the center may have a shape recessed in an arc. Thereby, since a possibility that the filter part 2 may contact the exterior can be reduced, a possibility that the filter part 2 may be damaged can be reduced. Thereby, the long-term reliability of the particulate matter measuring device component 100 can be improved.
- the base 1 has a glass component
- this glass component may spread over a part of the filter portion 2 as shown in FIG.
- the base portion 1 has a glass component
- the filter portion 2 has a glass diffusion region 20 in the vicinity of the base portion 1.
- the porosity of the upper layer 22 and the lower layer 24 adjacent to the base 1 is the middle layer 23. It may be larger than the porosity.
- a portion of the base 1 facing the flow path 11 may be raised in an arc shape.
- strength to a bending stress can be improved.
- the long-term reliability of the particulate matter measuring device component 100 can be improved.
- a portion of the base portion 1 facing the flow path 11 may be recessed in an arc shape.
- the movement of the gas flowing through the flow path 11 can be made smoother.
- the sensitivity of the particulate matter measuring device component 100 can be improved.
- the corners of the flow path 11 may be smooth. More specifically, the portion of the base portion 1 facing the flow path 11 is recessed in an arc shape, and the wall surface of the filter portion 2 facing the flow path 11 is recessed in an arc shape, which are smoothly continuous. May be. Thereby, since the gas flow can be further smoothed, the sensitivity of the particulate matter measuring device component 100 can be further improved.
- a corner portion formed by a portion of the base portion 1 facing the flow channel 11 and a wall surface of the filter portion 2 facing the flow channel 11 is arcuate. Also good. Thereby, the gas flow in the corner can be further smoothed.
- a corner portion formed of a portion facing the flow path 11 in the base portion 1 and a wall surface facing the flow passage 11 in the filter portion 2 is arcuate, and a region where the shape of the corner portion is arcuate is a flow passage. 11 may continue in the length direction. Thereby, the gas flow in the corner can be further smoothed.
- a recess may be provided on the wall surface of the filter portion 2 facing the flow path 11 in a cross-sectional view perpendicular to the length direction of the flow path 11.
- the flow path 11 has been described as an example extending from one side surface of the base 1 to the side surface at a position opposite thereto, but is not limited thereto.
- the flow path 11 may have one end opened on one side surface of the base 1 and the other end opened on a surface (lower surface) positioned at one end of the base 1. Good. Or you may open to the surface (lower surface) located in the two side surfaces which the base 1 opposes, and the one end part of the base 1.
- a gas inlet and outlet may be provided on adjacent surfaces. By disposing one surface provided with the outlet along the direction in which the exhaust gas flows, the exhaust gas easily flows from the inlet provided on the other surface even if the inlet is small.
- the filter portion 2 may be composed of two portions having different widths.
- the filter unit 2 may be composed of a thick part (large part) and a narrow part (small part).
- the filter part 2 has a part with a large width
- the filter unit 2 since the filter unit 2 has a portion with a narrow width, it is possible to facilitate the flow of gas through the filter unit 2.
- the width of the flow path 11 increases in the vertical direction as it goes outward (upper in the flow path 11 located on the upper side and lower in the flow path 11 located on the lower side).
- An expanding shape may be used. More specifically, the channel 11 may have a trapezoidal shape with the long side located outside. In general, when viewed in a longitudinal section, the gas tends to be less likely to flow outside than the inside (center side) of the channel 11. It is possible to reduce gas stagnation outside the passage 11.
- the flow path 11 is trapezoidal because the wall surface is linear, it is not restricted to this. For example, the wall surface may have one step or a plurality of steps.
- the base 1 may protrude outward from the filter part 2 located on the outermost side. Thereby, the possibility that the filter unit 2 may be damaged due to the foreign matter hitting the filter unit 2 located on the outermost side can be reduced.
- the base portion 1 may protrude to the outside rather than the outermost filter portion 2, and the surface of the outermost filter portion 2 may be covered with a protective layer 5. .
- a protective layer for example, a resin material in which ceramic powder is dispersed can be used.
- the end of the flow path 11 is partially sealed by the sealing part 4, and the surface of the sealing part 4 faces the flow path 11.
- the shape of the portion to be performed may be an arc shape that is concave on the flow path side. Thereby, it is possible to reduce the retention of gas in the vicinity of the sealing portion 4 in the flow path 11.
- Base 11 Channel 12: Divided channel 2: Filter unit 3: Electrode 4: Sealing unit 5: Protective layer 100, 200: Particulate material measuring device component
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Abstract
Description
11:流路
12:分割流路
2:フィルタ部
3:電極
4:封止部
5:保護層
100、200:粒子状物質の測定装置用部品
Claims (17)
- セラミックスから成り内部にガスの流れる流路を有する基部と、前記流路を複数に区切るように前記流路の内部に設けられた多孔質セラミックスから成るフィルタ部と、前記基部に前記フィルタ部を挟むように設けられた静電容量形成用の一対の電極とを備えており、
前記基部の前記流路の壁面が前記フィルタ部の表面よりも緻密である粒子状物質の測定装置用部品。 - セラミックスから成る板状の部材であって主面が対向するように並置された一対の基部と、該一対の基部の間の空間を区切って流路を形成するように設けられた多孔質セラミックスから成るフィルタ部と、前記一対の基部にそれぞれ設けられており前記フィルタ部を挟むように設けられた静電容量形成用の一対の電極とを備えており、
前記一対の基部の対向する前記主面が、前記フィルタ部の表面よりも緻密である粒子状物質の測定装置用部品。 - 前記電極が前記基部に埋設されている請求項1または請求項2に記載の粒子状物質の測定装置用部品。
- 前記基部および前記フィルタ部が一体的に形成されている請求項1乃至請求項3のいずれかに記載の粒子状物質の測定装置用部品。
- 前記基部および前記フィルタ部が同じセラミックスから成る請求項1乃至請求項4のいずれかに記載の粒子状物質の測定装置用部品。
- 前記基部および前記フィルタ部がアルミナから成る請求項5に記載の粒子状物質の測定装置用部品。
- 前記電極が、線状の配線パターンを有するとともに、前記フィルタ部に沿って設けられている請求項1乃至請求項6のいずれかに記載の粒子状物質の測定装置用部品。
- 前記電極が線状の配線パターンを有するとともに、前記基部のうち前記フィルタ部を挟む領域および前記フィルタ部を挟まない領域に設けられており、平面視したときに、前記電極のうち前記フィルタ部を挟まない領域に位置する部分が、前記フィルタ部を挟む領域に位置する部分よりも幅が狭くなっている請求項1乃至請求項7のいずれかに記載の粒子状物質の測定装置用部品。
- 互いにポーラス度が異なる複数の前記フィルタ部を有している請求項1乃至8のいずれかに記載の粒子状物質の測定装置用部品。
- 前記ポーラス度は気孔径である請求項9に記載の粒子状物質の測定装置用部品。
- 前記ポーラス度は気孔率であり、前記流路の長さ方向に垂直な断面視において、外側に位置する前記フィルタ部の気孔率が、内側に位置する前記フィルタ部の気孔率より大きい請求項9に記載の粒子状物質の測定装置用部品。
- 前記流路の長さ方向に垂直な断面視において、前記基部のうち前記流路に面する部分と前記フィルタ部のうち前記流路に面する壁面とから成る角部が弧状である請求項1乃至請求項11のいずかに記載の粒子状物質の測定装置用部品。
- 前記角部の形状が弧状である領域が前記流路の長さ方向に連続している請求項12に記載の粒子状物質の測定装置用部品。
- 前記流路の長さ方向に垂直な断面視において、前記フィルタ部のうち前記流路に面する壁面に凹部が設けられている請求項1乃至請求項13のいずれかに記載の粒子状物質の測定装置用部品。
- 前記流路の長さ方向に垂直な断面視において、前記フィルタ部のうち前記流路に面する壁面が、中央が凹んだ弧状である請求項1乃至請求項13のいずれかに記載の粒子状物質の測定装置用部品。
- 前記フィルタ部を上下方向に3層(上層、中層および下層)に分けたときに、前記基部と隣り合う前記上層および前記下層の気孔率が前記中層における気孔率よりも大きい請求項1乃至請求項15のいずれかに記載の粒子状物質の測定装置用部品。
- 複数の第1のセラミックグリーンシートを準備する工程と、
複数の第2のセラミックグリーンシートを準備する工程と、
前記第1のセラミックグリーンシートに電極層を形成する工程と、
前記第2のセラミックグリーンシートに貫通孔を形成する工程と、
前記電極層が形成された前記第1のセラミックグリーンシートと前記貫通孔が形成された前記第2のセラミックグリーンシートを積層して積層体を形成する工程と、
前記積層体を焼成する工程と
を備える粒子状物質の測定装置用部品の製造方法。
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CN201680069071.4A CN108291885A (zh) | 2015-11-26 | 2016-11-22 | 颗粒状物质的测定装置用部件及其制造方法 |
US15/779,390 US20180306743A1 (en) | 2015-11-26 | 2016-11-22 | Particulate matter measuring device component, and manufacturing method therefor |
JP2017552650A JP6626901B2 (ja) | 2015-11-26 | 2016-11-22 | 粒子状物質の測定装置用部品およびその製造方法 |
EP16868534.5A EP3382381A4 (en) | 2015-11-26 | 2016-11-22 | PARTICULATE DEVICE COMPONENT FOR MEASURING PARTICULATE MATERIALS AND METHOD FOR MANUFACTURING THE SAME |
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WO2019065069A1 (ja) * | 2017-09-27 | 2019-04-04 | 京セラ株式会社 | 測定装置用部品 |
EP3598118A1 (en) * | 2018-07-20 | 2020-01-22 | MEAS France | Capacitive gas sensors and manufacturing method thereof |
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CN108431588A (zh) * | 2015-12-25 | 2018-08-21 | 京瓷株式会社 | 粒子状物质的测量装置用部件 |
DE102019124239A1 (de) * | 2019-09-10 | 2021-03-11 | Volkswagen Aktiengesellschaft | Induktiv heizbarer Keramikkörper, Verfahren zur Herstellung eines Keramikkörpers, Abgasreinigungseinrichtung sowie Fahrzeug |
US20220082042A1 (en) * | 2020-09-17 | 2022-03-17 | Advanced Technology Emission Solutions Inc. | Apparatus and method for gaseous emissions treatment with resistive heating |
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EP3382381A1 (en) | 2018-10-03 |
JPWO2017090587A1 (ja) | 2018-08-30 |
JP6626901B2 (ja) | 2019-12-25 |
EP3382381A4 (en) | 2019-07-24 |
US20180306743A1 (en) | 2018-10-25 |
CN108291885A (zh) | 2018-07-17 |
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