公开(公告)号：US5573731A

公开(公告)日：1996-11-12

申请号：US449325

申请日：1995-05-24

申请人： Kouji Yoshizaki ,  Masahiko Ogai ,  Takuzou Kako ,  Yuuji Nakajima ,  Kenji Fujino ,  Kazunori Itoh ,  Shohgo Konya ,  Keiji Sato

发明人： Kouji Yoshizaki ,  Masahiko Ogai ,  Takuzou Kako ,  Yuuji Nakajima ,  Kenji Fujino ,  Kazunori Itoh ,  Shohgo Konya ,  Keiji Sato

IPC分类号： F01N3/20 ,  F01N3/28

CPC分类号： F01N3/281 ,  F01N3/2026 ,  F01N2330/02 ,  F01N2330/04 ,  Y02T10/26 ,  Y10T428/1234 ,  Y10T428/12347

摘要： The electrically heated catalytic converter of the present invention includes a catalyst substrate, which is formed as a scroll-like cylindrical laminated assembly. The assembly is formed by laminating a thin corrugated and plain metal sheets and winding the metal sheets together around a center electrode. The outermost layer of the laminated assembly is connected to an outer electrode. The corrugated metal sheet has an insulating coating made of an alumina, and the plain metal sheet is uninsulated. Local conductive connections form between the thin metal sheets by soldering strips of zirconium solder foils between the layers of the thin metal sheets. Since zirconium has a larger reducing capability than aluminum, the alumina in the insulating coating is reduced by zirconium and precipitates at the local conductive connections. Therefore, the plain and corrugated metal sheet are electrically connected to each other at the local conductive connections. The solder foils in the respective layers are arranged in a configuration where a strip of solder foil in one layer overlaps with strips of solder foils in adjoining layers only at its ends, and does not overlap with strips of solder foils in the adjacent layers when viewed radially. Since the solder foils overlap only by a small area, electric current flowing through the local conductive connections concentrates in the overlap area and produces hot spots. The overall resistance of the electric paths can be adjusted by varying the solder strip length.

摘要翻译： 本发明的电加热催化转化器包括形成为涡旋状圆柱形层压组件的催化剂基材。 该组件通过层叠薄的波纹状和平坦的金属片并将金属片绕在中心电极周围形成。 层叠组件的最外层与外部电极连接。 波纹金属片具有由氧化铝制成的绝缘涂层，并且平板金属片未绝缘。 通过在薄金属片的层之间焊接锆焊料箔片，在薄金属片之间形成局部导电连接。 由于锆具有比铝更大的还原能力，绝缘涂层中的氧化铝被锆还原，并在局部导电连接处沉淀。 因此，平坦且波纹状的金属片在局部导电连接处彼此电连接。 各层中的焊料箔布置成其中一层中的焊料箔条仅在其端部与相邻层中的焊料条带重叠的构造，并且在观察时不与相邻层中的焊料条带重叠 径向地 由于焊锡箔仅重叠小面积，流过局部导电连接的电流集中在重叠区域并产生热点。 可以通过改变焊料条长度来调整电路的整体电阻。