Catalytic converter for purifying gases

• US 4,278,639 A
• Filed: 03/14/1980
• Issued: 07/14/1981
• Est. Priority Date: 03/19/1979
• Status: Expired due to Term

• Current Assignee: Toyo Kogyo Co Ltd (Mazda Motor Corporation)
• Original Assignee: Toyo Kogyo Co Ltd (Mazda Motor Corporation)
• Inventors: Honda, Yasuo, Tadokoro, Tomoo
• Primary Examiner(s): GARRIS, BRADLEY R
• Application Number:
  US06/130,445
• Time in Patent Office: 487 Days
• Field of Search: 422/171, 422/172, 422/179, 422/180, 60/299, 29/157 R, 29/455 R
• US Class Current: 422/171
• CPC Class Codes: F01N 13/0097 the purifying devices are arranged in a single housing
• CPC Class Codes: F01N 2270/04 for afterburning
• CPC Class Codes: F01N 2350/02 Fitting ceramic monoliths in a metallic housing
• CPC Class Codes: F01N 3/2853 using mats or gaskets between catalyst body and housing
• CPC Class Codes: F01N 3/2867 the mats or gaskets being placed at the front or end face of catalyst body
• CPC Class Codes: F01N 3/34 using air conduits or jet air pumps, e.g. near the engine exhaust port
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A catalytic converter for effecting purification of automobile exhaust gases comprises a casing having inlet and outlet, at least two separate catalyst carriers within the casing, a spacer ring element for connecting the catalyst carriers together in longitudinally spaced and aligned relation to each other to provide a single unitary structure of catalyst carriers, and a cushioning layer positioned in compressed sandwich fashion between the unitary structure and the casing.

Claims

1. A catalytic converter for effecting purification of exhaust gases by catalytic reaction, which comprises, in combination:

a generally elongated casing having at one end an inlet for receiving the exhaust gases and at the other end an outlet for discharging the exhaust gases which have been passed through the casing;

at least two separate catalyst carriers of honeycomb type positioned in said casing and each having a plurality of parallel closely adjacent flow passages extending throughout the length thereof;

a spacer ring means between said catalyst carriers and connecting the catalyst carriers together in longitudinally spaced relation in a unitary structure, said spacer ring means being an annular spacer body having a cross-sectional shape similar to that of said catalyst carriers and a size for securing the ends of said catalyst carriers therein, and two sets of stop pawls each having at least two stop pawls protruding radially inwardly from the annular spacer body, one set adjacent each end of said spacer body, each stop pawl in a set being spaced inwardly from a corresponding end of said spacer body, said annular spacer body having the opposed ends of the adjacent catalyst carriers within said spacer body and abutting the pawls of the corresponding sets and holding the catalyst carriers in alignment with the longitudinal axis of the casing and retaining the catalyst carriers in position in the unitary structure; and

a heat-insulating and cushioning layer positioned in compressed sandwich fashion between the unitary structure and the casing and surrounding the unitary structure.

2. A catalytic converter as claimed in claim 1, wherein each of the stop pawls is formed by bending a corresponding end portion of the annular spacer body in a direction radially inwardly of the annular spacer body.

3. A catalytic converter as claimed in claim 2, wherein the cushioning layer is constituted by a knitted web of metallic mesh fabric.

4. A catalytic converter as claimed in claim 2, further comprising an air supply nozzle having one end situated externally of the casing for fluid-connection to a source of air and the other end extending into the space between the catalyst carriers inside the casing, said air supply nozzle supplying air into the space between the catalyst carriers.