Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Waste gas purifier
Patent
1995-02-03
1997-01-14
Warden, Robert
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Waste gas purifier
55523, 55524, 422211, 422312, B01D 5000
Patent
active
055936466
DESCRIPTION:
BRIEF SUMMARY
This application is based on International Application No. PCT/JP94/00919, filed Jun. 7, 1994.
TECHNICAL FIELD
This invention relates to a metal carrier for carrying an exhaust gas cleaning catalyst for automobiles, autobicycles, and industrial equipment, and a production method thereof.
BACKGROUND TECHNOLOGY
As a catalyst carrier for cleaning exhaust gas of automobiles, a honeycomb-formed metal carrier comprising heat-resistant stainless steel is known. The metal carrier is formed by winding round a stack of a flat plate and a corrugated plate to form a honeycomb core body and joining the outer periphery of the honeycomb core body and inner surface of a metal outer cylinder.
Various methods are known as the production method of the metal carrier. For example, Japanese Patent Publication 63-44466 describes a metal carrier in which a pile of a flat plate and a corrugated plate is wound round, and the vicinity at least one of end faces of the wound honeycomb core body is soldered. However, such a metal carrier, when actually used on an internal combustion engine for automobile, tends to undergo deformation of the honeycomb core body or breakage of a foil on an outer periphery of the honeycomb core body due to thermal fatigue by heat cycle of heating and cooling. In particular, the exhaust gas inlet side of the honeycomb core body undergoes considerable cell deformation and foil breakage because it is exposed to high-temperature exhaust gas. Further, the metal carrier may be broken at the joined portion due to engine vibration and vibration during traveling.
Further, Japanese Patent Laid-open Publication 56-4373 discloses a honeycomb core body produced by a method in which solder is coated on a flat steel plate or at peaks of a corrugated steel plate through a supply roller from a vessel filled with liquid solder paste, and the former is wound round with a corrugated steel plate, or the latter is wound round with a flat steel plate. The patent also discloses a honeycomb core body produced by a method in which before coating solder, an adhesive is coated at a position to be solder coated through a supply device, and wound round while sprinkling a powder-formed solder material by a distribution device. In these honeycomb core bodies, the powder-formed solder material is piled in layers between the flat steel plate and the corrugated steel plate. Further, since the stack of the powder-formed solder material particles between the flat steel plate and the corrugated steel plate exists in amounts of twice the number of turns from the center of the honeycomb core body to the outermost periphery, when treated by vacuum soldering, the solder material melts to generate voids between the flat steel plate and the corrugated steel plate, and the voids in layers collect at several positions. Therefore, the honeycomb core body obtained by this method has unsoldered portions between the flat steel plate and the corrugated steel plate. Further, since the solder thickness increases at the joined portion of the flat steel plate and the corrugated plate, the core body tends to break at the brittle solder material and is insufficient in strength.
As another method, Japanese Patent Laid-open Publication 4-141238 discloses a production method of a metal carrier, in which a plurality of binder injectors having needles on the surface and backside of a corrugated foil are disposed in a single or multiple stages parallel to the corrugation, and operation of the binder injectors is selected so that the binder is coated at peaks of the corrugation in a previously designed range according to the movement of the corrugated foil to select joining positions of the corrugated foil and flat foil at desired positions of the honeycomb core body.
In producing a honeycomb core body by this method, to select a joining position of the corrugated foil and flat foil at a desired position of the honeycomb core body, first only the binder is supplied, after winding the honeycomb core body, or after containing it in an outer cylinder, a process to
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Aoki Yukio
Iizuka Masaru
Koshiba Yoshikazu
Kuroda Yasuhide
Minakata Tsuyoshi
Nippon Yakin Kogyo Co. Ltd.
Thornton Krisanne M.
Warden Robert
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