JP2021032096A - 排ガス浄化フィルタ - Google Patents
排ガス浄化フィルタ Download PDFInfo
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- JP2021032096A JP2021032096A JP2019150586A JP2019150586A JP2021032096A JP 2021032096 A JP2021032096 A JP 2021032096A JP 2019150586 A JP2019150586 A JP 2019150586A JP 2019150586 A JP2019150586 A JP 2019150586A JP 2021032096 A JP2021032096 A JP 2021032096A
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- 238000005192 partition Methods 0.000 claims abstract description 107
- 238000007789 sealing Methods 0.000 claims abstract description 22
- 238000000746 purification Methods 0.000 claims description 91
- 230000035939 shock Effects 0.000 abstract description 18
- 210000004027 cell Anatomy 0.000 description 193
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- 238000010586 diagram Methods 0.000 description 10
- 229910052878 cordierite Inorganic materials 0.000 description 9
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 9
- 230000035882 stress Effects 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
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- 229910052753 mercury Inorganic materials 0.000 description 7
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- 238000010304 firing Methods 0.000 description 6
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- 239000005995 Aluminium silicate Substances 0.000 description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
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Abstract
Description
フィルタ軸方向(Y)に延びており、上記フィルタ軸方向と直交する平面での断面形状が四角形状である複数のセル(21、21a、21b)と、上記複数のセルを区画形成する多孔質の隔壁(22)とを備えるセル構造部(2)と、
上記セル構造部における上記セルの両端(211、222)を互い違いに閉塞する封止部(11)と、
上記セル構造部の外周に形成された筒状のスキン部(12)と、を有しており、
上記隔壁の気孔率P1および上記スキン部の気孔率P2が、いずれも50%以上70%以下であり、
上記P1<上記P2の関係を満たし、
上記P2−上記P1で定義される気孔率差ΔPが20%以下であり、
上記セルの外縁(213)が上記隔壁の交差位置(225)にて丸みを帯びており、上記交差位置での曲率半径R、上記セルの水力直径の半径rが、0.2<R[mm]/r[mm]<1の関係を満たす、
排ガス浄化フィルタ(1)にある。
実施形態1に係る排ガス浄化フィルタについて、図1〜図6を参照して説明する。図1、図2に示すように、本実施形態の排ガス浄化フィルタ1は、セル構造部2と、封止部11と、スキン部12とを有する。セル構造部2、スキン部12は、コーディエライトなどのセラミックスから構成される。
隔壁22の気孔率P1(%)=総気孔容積/(総気孔容積+1/隔壁材料の真比重)×100
スキン部12の気孔率P2(%)=総気孔容積/(総気孔容積+1/スキン部材料の真比重)×100
なお、隔壁材料、スキン部材料がコーディエライトの場合、コーディエライトの真比重としては2.52を用いることができる。
実施形態2に係る排ガス浄化フィルタについて、図7を用いて説明する。なお、実施形態2以降において用いられる符号のうち、既出の実施形態において用いた符号と同一のものは、特に示さない限り、既出の実施形態におけるものと同様の構成要素等を表す。
実施形態3に係る排ガス浄化フィルタについて、図8から図10を用いて説明する。本実施形態の排ガス浄化フィルタ1は、セル構造部2の材料強度SAおよびスキン部12の材料強度SBとが、SB<SAの関係を満たす。この構成によれば、フィルタ強度が向上する。さらに、この構成によれば、高温に曝された際に、セル構造部2はフィルタ基材内でより高温になり、熱膨張が大きくなるが、材料強度が大きい分その熱膨張に耐えることができるので、熱応力がスキン部12まで行き届き難くなり、スキン部12におけるクラックを抑制しやすくなる。
材料強度(MPa)=曲げモーメント(N・mm)/断面係数(mm3)
曲げモーメント(N・mm)=荷重(N)×4点曲げ試験の支点間距離(mm)/4
本実験例では、隔壁の気孔率P1を50%、55%、60%、65%とし、スキン部の気孔率P2を変化させることにより、各P1の水準について気孔率差ΔPが5〜20%の範囲で異なる複数の排ガス浄化フィルタを作製した。各排ガス浄化フィルタにおけるR[mm]/r[mm](以下、単にR/rと表記する)は、0.2よりも大きく1よりも小さい範囲内の一定値とした。各排ガス浄化フィルタは、フィルタ軸方向Yの長さLが100mm、直径Φが118mm、隔壁の厚みが0.2mm、スキン部の厚みが0.6mm、セルピッチが、1.47mmである。各排ガス浄化フィルタにおいて、熱応力σは、E(ヤング率)×α(熱膨張係数)×ΔT(温度差)の式より算出することができる。なお、ΔT(温度差)は、ΔQ(熱量)/{M(重量)×Cp(比熱)}の式より算出することができる。本例では、具体的には、隔壁とスキン部との気孔率差ΔPと熱応力との関係をCAE解析することにより、熱応力σを求めた。この際、解析ソフトには、Ansys classicV.17.2を用いた。気孔率差ΔP(横軸)と熱応力σ(縦軸)との関係を図11に示す。
本実験例では、隔壁の気孔率P1が異なる複数の排ガス浄化フィルタを作製した。各排ガス浄化フィルタにおいて、気孔率差ΔPは5%、R/rは、0.2よりも大きく1よりも小さい範囲内の一定値とした。各排ガス浄化フィルタは、フィルタ軸方向Yの長さLが100mm、直径Φが118mm、隔壁の厚みが0.2mm、スキン部の厚みが0.6mm、セルピッチが、1.47mmである。各排ガス浄化フィルタについて、ガス透過係数、圧力損失を測定した。なお、ガス透過係数および圧損は、具体的には、特開2019−2298号公報に開示される公知の測定方法に基づいて測定した。なお、特開2019−2298号公報に開示される公知の測定方法は、参照により本明細書に組み込むことができる。ガス透過係数(横軸)と圧力損失(縦軸)との関係を図12に示す。隔壁の気孔率(横軸)とガス透過係数(縦軸)との関係を図13に示す。また、各排ガス浄化フィルタについて、セル構造部の材料強度を測定した。隔壁の気孔率(横軸)とセル構造部の材料強度(縦軸)との関係を図14に示す。
本実験例では、R/rの値が異なる複数の排ガス浄化フィルタを作製した。各排ガス浄化フィルタにおいて、隔壁の気孔率およびスキン部の気孔率はいずれも50%以上70%以下の範囲内の一定値であり、気孔率差ΔPは0%超20%以下の範囲内の一定値とした。各排ガス浄化フィルタは、フィルタ軸方向Yの長さLが100mm、直径Φが118mm、隔壁の厚みが0.2mm、スキン部の厚みが0.6mm、セルピッチが、1.47mmである。各排ガス浄化フィルタについて、圧力損失を測定した。圧力損失は、次のように測定した。排ガス浄化フィルタを2.0Lのガソリン直噴エンジンの排気管内に取り付け、吸入空気量(Ga)が100g/sとなる状態(定常)にした。そして、排ガス浄化フィルタ1内にPMを含む排ガスを流した。このとき、排ガス浄化フィルタ1の前後の圧力を測定し、その差分を圧損として計測した。R/rの値(横軸)と圧力損失(縦軸)との関係を図15に示す。R/rの値(横軸)とセル構造部の実肉断面積(縦軸)との関係を図16に示す。R/rの値(横軸)と1/R2の値(縦軸)との関係を図17に示す。
本実験例では、隔壁の気孔率P1およびスキン部の気孔率P2が、いずれも50%以上70%以下であり、P1<P2の関係を満たし、気孔率差ΔPが20%以下であり、0.2<R/r<1の関係を満たす排ガス浄化フィルタを作製した。各排ガス浄化フィルタは、フィルタ軸方向Yの長さLが101.6mm、直径Φが118.4mm、隔壁の厚みが0.216mm、スキン部の厚みが0.6mm、セルピッチが、1.47mm、セル角部の曲率半径R:0.2mmである。
11 封止部
12 スキン部
2 セル構造部
21 セル
22 隔壁
225 交差位置
Claims (2)
- ガソリンエンジン(E)の排気通路(A)に配置されて使用される排ガス浄化フィルタ(1)であって、
フィルタ軸方向(Y)に延びており、上記フィルタ軸方向と直交する平面での断面形状が四角形状である複数のセル(21、21a、21b)と、上記複数のセルを区画形成する多孔質の隔壁(22)とを備えるセル構造部(2)と、
上記セル構造部における上記セルの両端(211、222)を互い違いに閉塞する封止部(11)と、
上記セル構造部の外周に形成された筒状のスキン部(12)と、を有しており、
上記隔壁の気孔率P1および上記スキン部の気孔率P2が、いずれも50%以上70%以下であり、
上記P1<上記P2の関係を満たし、
上記P2−上記P1で定義される気孔率差ΔPが20%以下であり、
上記セルの外縁(213)が上記隔壁の交差位置(225)にて丸みを帯びており、上記交差位置での曲率半径R、上記セルの水力直径の半径rが、0.2<R[mm]/r[mm]<1の関係を満たす、
排ガス浄化フィルタ(1)。 - 上記セル構造部は、上記セル構造部の最外周に位置して上記スキン部に接しており、かつ、上記フィルタ軸方向と直交する平面での断面形状が四角形状でない複数の不完全セルを備えており、
断面形状が四角形状である上記セルを完全セルとしたとき、
複数の上記不完全セルのうち、セル開口面積が上記完全セルのセル開口面積の30%以下である上記不完全セルは、閉塞部により閉塞されている、
請求項1に記載の排ガス浄化フィルタ。
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