CN201420592Y

CN201420592Y - Double-manifold catalytic converter of gasoline engine

Info

Publication number: CN201420592Y
Application number: CN200920118797XU
Authority: CN
Inventors: 陈法献
Original assignee: LINHAI BONDLYE MOTOR VEHICLE ENVIRONMENTAL TECHNOLOGY Co Ltd
Current assignee: ZHEJIANG BONDLYE ENVIRONMENTAL TECHNOLOGY CO., LTD.
Priority date: 2009-04-29
Filing date: 2009-04-29
Publication date: 2010-03-10
Anticipated expiration: 2019-04-29

Abstract

A double-manifold catalytic converter of a gasoline engine belongs to the technical field of gasoline engine catalytic converters, and comprises a front flange, an exhaust manifold, a front end cover,a cylinder body, an oxygen sensor base and a rear end cover, wherein a catalyst carrier is arranged in the cylinder body and is wrapped by a ceramic sealing gasket, and the two ends of the cylinder body are respectively sealed by the front end cover and the rear end cover. The double-manifold catalytic converter is characterized in that the exhaust manifold is merged by a hemispherical double-layered upper casing and a hemispherical double-layered lower casing. By adopting the robot welding forming technology and the double-layer structures of the exhaust manifold and a spherical exhaust mixing chamber, the insulating effect is good, and the loss of the heat energy is less; and furthermore, the double-manifold catalytic converter of the gasoline engine has the advantages of simple structure and convenient manufacture, and can greatly improve the service durability and the assembly ability of the catalytic converter.

Description

The double-deck manifold catalytic converter of a kind of petrol engine

Technical field

The utility model belongs to petrol engine catalytic converter technology field, is specifically related to a kind of three cylinders, the double-deck manifold catalytic converter of four-cylinder gasoline machine.

Background technique

At present, the environmental problem that motor vehicle exhaust emission brings more and more is subjected to the attention of countries in the world, administers motor vehicle exhaust emission and mainly adopts the ternary catalyzing unit post-processing technology.China has successively captured correlation technique, has realized meeting the production domesticization of the ternary catalyzing unit of Europe II emission standard.Along with state's three standards were carried out by country since 08 year, existing ternary catalyzing unit can't satisfy this requirement.The difference of Europe II standard and EUROIII Emission Standard maximum is that Europe II standard is that engine cold-start begins to survey tail gas after 40 seconds, and EUROIII Emission Standard is to survey tail gas behind the engine start immediately.The initiation temperature of ternary catalyzing unit is that it is inoperative being lower than this temperature about 280 degree.For this reason, need ternary catalyzing unit is installed on the engine body, utilize high temperature herein to carry out catalyzed conversion.Exhaust has some setbacks, exhaust back pressure is big, distribution of gas is inhomogeneous, effect of heat insulation is poor, heat-energy losses is big, the oxygen sensor signal reception is insensitive, ceramic seal liner face easily is deflated problems such as deflation, processing technology complexity but exist.

The model utility content

At problems of the prior art, the utility model is by changing the structure of petrol engine catalytic converter, and design provides that a kind of distribution of gas is even, gas pressure is constant, the technological scheme of good heat-insulation effect, heat-energy losses is few, exhaust is smooth and easy, exhaust back pressure is little, oxygen sensor signal receives sensitive, superior durability the double-deck manifold catalytic converter of petrol engine.

The double-deck manifold catalytic converter of described a kind of petrol engine, comprise forward flange, gas exhaust manifold, front cover, cylindrical shell, the lambda sensor seat, rear end cover is provided with catalyst carrier in the cylindrical shell, catalyst carrier is wrapped up by the ceramic seal liner, the cylindrical shell two ends have front cover and rear end cover capping respectively, it is characterized in that gas exhaust manifold is formed by double-deck upper shell of hemisphere and the double-deck lower shell body merging of hemisphere.

The double-deck manifold catalytic converter of described a kind of petrol engine is characterized in that double-deck upper shell of hemisphere and the double-deck lower shell body of hemisphere are formed by connecting by upper and lower stamping part respectively.

The double-deck manifold catalytic converter of described a kind of petrol engine is characterized in that upper and lower stamping part is welded to connect, and the gap between the upper and lower stamping part is 0.5mm-4.5mm, is vacuum state between the upper and lower stamping part.

The double-deck manifold catalytic converter of described a kind of petrol engine is characterized in that the gap between the upper and lower stamping part is 1.5mm-3.5mm.

The double-deck manifold catalytic converter of described a kind of petrol engine is characterized in that the lambda sensor seat comprises preceding lambda sensor seat and post oxygen sensor seat.

The double-deck manifold catalytic converter of described a kind of petrol engine is characterized in that rear end cover is by pipe, flange, the casting integrated moulding of post oxygen sensor seat.

The double-deck manifold catalytic converter of described a kind of petrol engine, it is characterized in that double-deck upper shell of hemisphere and the double-deck lower shell body of hemisphere are welded into gas exhaust manifold and spherical waste gas mixing chamber, lambda sensor seat before being provided with on the double-deck upper shell of the hemisphere of spherical waste gas mixing chamber.

The double-deck manifold catalytic converter of described a kind of petrol engine is characterized in that the two ends of ceramic seal liner are provided with back-up ring, and back-up ring forms for Stainless Steel Cloth multilayer stack compacting.

The double-deck manifold catalytic converter of described a kind of petrol engine, it is characterized in that the material that forward flange adopts is a carbon steel, the material that the double-deck upper shell of hemisphere, hemisphere double-deck lower shell body, cylindrical shell, front cover and back-up ring are adopted is a stainless steel, and the material that rear end cover adopts is a spheroidal graphite cast iron.

The utility model adopts the robot welding moulding process, the gas exhaust manifold that the petrol engine combustion gas is welded into via double-deck upper and lower half shell of hemisphere, after importing the transition of spherical waste gas mixing chamber again, flow into stainless steel cylinder and purify, reached that oxygen ion concentration homogeneous distribution of gas is even, gas pressure is constant, exhaust is smooth and easy, exhaust back pressure is little, oxygen sensor signal receives sensitive, ceramic seal liner face and be difficult for being deflated requirements such as deflation through catalyst carrier; Gas exhaust manifold and spherical waste gas mixing chamber have adopted double layer construction, and good heat-insulation effect, heat-energy losses are few; And the double-deck manifold catalytic converter of this petrol engine has characteristics simple in structure, easily manufactured, improved catalytic converter durability and assembling capacity greatly.

Description of drawings

Fig. 1 is the double-deck manifold catalytic converter of the utility model three a cylinders profile schematic representation;

Fig. 2 is the sectional structure schematic representation of Fig. 1;

Fig. 3 is the double-deck manifold catalytic converter of the utility model four a cylinders profile schematic representation;

Fig. 4 is the sectional structure schematic representation of Fig. 3.

Among the figure: lambda sensor seat, 11-post oxygen sensor seat before 1-forward flange, the double-deck upper shell of 2-hemisphere, the double-deck lower shell body of 3-hemisphere, 4-front cover, 5-cylindrical shell, 6-rear end cover, 7-ceramic seal liner, 8-catalyst carrier, the 9-back-up ring, 10.

Embodiment

As shown in Figure 1 and Figure 2, the utility model is the double-deck manifold catalytic converters of three cylinders, Fig. 3, Fig. 4 are the double-deck manifold catalytic converters of four cylinders for the utility model, it comprises forward flange 1, gas exhaust manifold, front cover 4, cylindrical shell 5, preceding lambda sensor seat 10, post oxygen sensor seat 11, rear end cover 6, catalyst carrier 8, catalyst carrier 8 are set by ceramic seal liner 7 parcels in the cylindrical shell 5, cylindrical shell 5 two ends have front cover 4 and rear end cover 6 cappings respectively.Double-deck upper shell 2 of hemisphere and the double-deck lower shell body 3 of hemisphere are welded into gas exhaust manifold and spherical waste gas mixing chamber, gas exhaust manifold picks out by the cylinder head of forward flange 1 by motor, importing spherical waste gas mixing chamber is connected with front cover 4, preceding lambda sensor seat 10 is arranged on the double-deck upper shell 2 of hemisphere of spherical waste gas mixing chamber, it is three that the double-deck lower shell body 3 of double-deck upper shell 2 of the double-deck manifold catalytic converter of three cylinders hemisphere and hemisphere merges the back manifold, it is four that the double-deck lower shell body 3 of double-deck upper shell 2 of the double-deck manifold catalytic converter of four cylinders and hemisphere merges the back manifold, adopt such structure petrol engine combustion gas after the transition of spherical waste gas mixing chamber, reach the concentration homogeneous of oxonium ion, distribution of gas is even, gas pressure is constant, heat-energy losses is few, exhaust is smooth and easy, exhaust back pressure is little, oxygen sensor signal receives requirements such as sensitivity, but also made things convenient for manufacturing, improved catalytic converter durability and assembling capacity.Double-deck upper shell 2 of hemisphere and the double-deck lower shell body 3 of hemisphere are welded by upper and lower stamping part respectively, and the gap between the upper and lower stamping part is 0.5mm-4.5mm, is preferably 1.5mm-3.5mm, weld behind each self-evacuating vacuum, after adopting double layer construction, good heat-insulation effect, heat loss is few.Rear end cover 6 has comprised pipe, flange, post oxygen sensor seat 11, these parts and rear end cover 6 casting integrated moulding, and rear end cover 6 is connected with cylindrical shell 5, such designs simplification processing technology, and improved the tightness and the durability of catalytic converter.The two ends of ceramic seal liner 7 are provided with back-up ring 9, and back-up ring 9 forms for Stainless Steel Cloth multilayer stack compacting, and it effectively solves ceramic seal liner 7 front-end faces easily by problems such as air-flow deflation, increases the service life.The material that forward flange 1 is adopted is a carbon steel, and the material that the double-deck upper shell 2 of hemisphere, the double-deck lower shell body 3 of hemisphere, cylindrical shell 5, front cover 4 and back-up ring 9 are adopted is a stainless steel, and the material that rear end cover 6 adopts is a spheroidal graphite cast iron.

Claims

1. the double-deck manifold catalytic converter of a petrol engine, comprise forward flange (1), gas exhaust manifold, front cover (4), cylindrical shell (5), the lambda sensor seat, rear end cover (6) is provided with catalyst carrier (8) in the cylindrical shell (5), catalyst carrier (8) is wrapped up by ceramic seal liner (7), cylindrical shell (5) two ends have front cover (4) and rear end cover (6) capping respectively, it is characterized in that gas exhaust manifold is formed by double-deck upper shell (2) of hemisphere and the double-deck lower shell body of hemisphere (3) merging.

2. the double-deck manifold catalytic converter of a kind of petrol engine as claimed in claim 1 is characterized in that double-deck upper shell (2) of hemisphere and the double-deck lower shell body of hemisphere (3) are formed by connecting by upper and lower stamping part respectively.

3. the double-deck manifold catalytic converter of a kind of petrol engine as claimed in claim 2 is characterized in that upper and lower stamping part is welded to connect, and the gap between the upper and lower stamping part is 0.5mm-4.5mm, is vacuum state between the upper and lower stamping part.

4. the double-deck manifold catalytic converter of a kind of petrol engine as claimed in claim 2 is characterized in that the gap between the upper and lower stamping part is 1.5mm-3.5mm.

5. the double-deck manifold catalytic converter of a kind of petrol engine as claimed in claim 1 is characterized in that the lambda sensor seat comprises preceding lambda sensor seat (10) and post oxygen sensor seat (11).

6. the double-deck manifold catalytic converter of a kind of petrol engine as claimed in claim 1 is characterized in that rear end cover (6) is by pipe, flange, the casting integrated moulding of post oxygen sensor seat (11).

7. the double-deck manifold catalytic converter of a kind of petrol engine as claimed in claim 1, it is characterized in that double-deck upper shell (2) of hemisphere and the double-deck lower shell body of hemisphere (3) are welded into gas exhaust manifold and spherical waste gas mixing chamber, lambda sensor seat (10) before being provided with on the double-deck upper shell of the hemisphere of spherical waste gas mixing chamber (2).

8. the double-deck manifold catalytic converter of a kind of petrol engine as claimed in claim 1 is characterized in that the two ends of ceramic seal liner (7) are provided with back-up ring (9), and back-up ring (9) forms for Stainless Steel Cloth multilayer stack compacting.

9. the double-deck manifold catalytic converter of a kind of petrol engine as claimed in claim 1, it is characterized in that the material that forward flange (1) is adopted is a carbon steel, the material that the double-deck upper shell (2) of hemisphere, the double-deck lower shell body (3) of hemisphere, cylindrical shell (5), front cover (4) and back-up ring (9) are adopted is a stainless steel, and the material that rear end cover (6) adopts is a spheroidal graphite cast iron.