CN2089076U

CN2089076U - Exhaust gas purifying device for gasoline engine vehicle

Info

Publication number: CN2089076U
Application number: CN91206460U
Authority: CN
Inventors: 邱瑞林; 陈君爵; 周春民
Original assignee: Aviation Cause Department China Aeronautics And Astronautics Civil Aaticle Gene
Current assignee: Aviation Cause Department China Aeronautics And Astronautics Civil Aaticle Gene
Priority date: 1991-04-23
Filing date: 1991-04-23
Publication date: 1991-11-20

Abstract

The utility model relates to an exhaust gas purifying device for gasoline engine vehicles, which is composed of an air inlet pipe, a casing, two solid catalysts and an exhaust pipe. A pyramidal opening made of a sheet is arranged between the air inlet pipe and the catalyst and points to the partial flow baffle plate of the air inlet pipe, and the pyramidal surface is provided with a series of through holes. A baffle plate is arranged between the two catalysts, the baffle plate is provided with holes, the holes in the middle are small and thin, and the holes on the periphery are big and thick. Because of the actions of the partial flow baffle plate and the baffle plate, the purifying function of the catalyst can be developed fully, the homogeneous distribution of the stress and the temperature of the catalyst can be ensured basically on different conditions, and the catalyst chipping caused by nonuniform thermal expansion and inner stress is reduced greatly. The utility model has the advantages of simple and reliable structure, long service life and low manufacturing cost and can satisfy the requirements of various exhaust gas purifications for gasoline engines.

Description

Exhaust gas purifying device for gasoline engine vehicle

The utility model is a kind of device that is used for the gasoline car exhaust gas purification.

The waste gas that gasoline car is discharged has CO, HC and NOx three major types, their severe contaminations environment, destroyed ecotope, human existence is constituted a threat to.Therefore, people once released the multiple catalytic combustion form of passing through for administering emission of automobile wastes, made harmful gas become CO ₂, steam and N ₂, purified waste gas like this.But, certainly will produce very high temperature, even can reach 1000 ℃, and the solid essence of catalyzer is to be made by high temperature potter's clay that solid ceramic is subjected to: (1) uneven high temperature dilatancy because waste gas carries out secondary combustion in purifier; The effect of (2) thermal shock power, often broken easily.

CN90210027 once released and a kind ofly fixes one make blast air be uniformly distributed in the flow distributor of catalyzer end face between suction tude and catalyzer, this device is one to be hemisphere face and the shunting cap relative with suction tude, but by facts have proved, this device produces less than expected effect.Because automobile travels under different condition, the flow of all air-flows is different with impact force, easilier so sometimes makes solid ceramic cracked.

The purpose of this utility model provides a kind of gasoline car purifier with flow distributor, by this flow distributor, the blast air under different situations can be on catalyzer be evenly distributed, thus suppress that solid ceramic constituted cracked.Product has good purifying effect, and mechanism is simple and reliable, long service life, and low cost of manufacture can be as with the petrolic purifier outside engine of various differences.

The utility model is realized by following measure: purifier comprises suction tude, shell, two solid catalysts and outlet pipe, characteristics are that a distributing damper is installed between suction tude and catalyzer, this distributing damper is the cone of being made by thin plate, be uniform-distribution with a series of through holes on the whole conical surface, the opening of cone is relative with the inlet stream direction that is entered by suction tude, between two catalyzer, a baffle plate that has a series of vents also is installed, the hole of this baffle plate intermediate portion is smaller and more sparse, hole on every side bigger and relatively close.Above-mentioned distributing damper and baffle plate constitute flow distributor.The conical lower portion edge of distributing damper and the side face of baffle plate be the profiling fixed installation on the internal surface of shell, and their size depends on the end area of catalyzer.

The utility model has the advantages that the purification function that to give full play to catalyzer, make catalyzer can guarantee substantially that under different condition stressed and temperature evenly distributes, reduce catalyst breakage uneven because of thermal expansion and that internal stress causes significantly, and it is simple and reliable for structure, long service life, low cost of manufacture can satisfy the needs of various petrol engine exhaust gas purifications.

Below in conjunction with accompanying drawing the utility model is described further.

Fig. 1 is a cross-sectional view of the present utility model.

Fig. 2 is the left view of Fig. 1.

Wherein: 1 is suction tude, and 2 is distributing damper, and 3 is catalyst A, and 4 is baffle plate, and 5 is catalyst B, and 6 is shell, and 7 is outlet pipe.

This purifier comprises suction tude (1), distributing damper (2), catalyst A (3), baffle plate (4), catalyst B (5), cylinder-like shell (6), outlet pipe (7).One end of suction tude (1) is connected with the relief opening of gasoline vehicle engine, the other end is connected with shell (6), shell is for splitting and have the stamping part structure of welding edge vertically, being placed with two in proper order in the enclosure is the cylinder honeycombed catalyst-catalyst A and the catalyst B of carrier by ceramic rare earth, distributing damper (2) and baffle plate (4), the cone of distributing damper (2) for making by thin plate, be uniform-distribution with a series of small through hole on the whole conical surface, this distributing damper (2) is positioned between suction tude (1) and the catalyst A (3), tapered opening is facing to suction tude (1), and cone bottom sides edge and shell (6) internal surface profiling fixedly mounts; Between catalyst A (3) and catalyst B (5), be baffle plate (4), baffle plate (4) is a circular plate, be drilled with a series of through holes above, the hole of intermediate portion is smaller and more sparse, hole on every side bigger and relatively close, the profiling on the internal surface of shell of the periphery of baffle plate (4) is installed, distributing damper (2) and baffle plate (4) constitute the flow distributor of this purifier, when they are installed, making the central axes of its central axis and shell (6), is outlet pipe (7) at the rear portion of shell (6).

For the needs of eliminating the noise, the diameter of suction tude (1) and outlet pipe (7) is significantly smaller than the diameter of shell (6), and adds the vibration damping filler between shell (6) and catalyst A (3), catalyst B (5).Be to improve purifying effect, between facing to the outer cylinder of catalyst A (3) one ends of distributing damper (2) and shell (6), add a seal ring, do not purify and discharge atmosphere thereby enter the vibration damping filler with the waste gas of avoiding motor.

The waste gas that gasoline vehicle engine is discharged through suction tude (1), enters the inner chamber of purifier, and the effect through distributing damper (2) enters catalyst A (3) more equably and carries out the burning purification first time; Because it is on the catalyst B (5) that the fragmentation of catalyzer mainly occurs in second, so baffle plate (4) has been installed before it, air-flow enters catalyst B (5) more equably through the effect of baffle plate (4) like this, carry out the burning second time and purify, the gas of final purification (mainly is CO ₂, steam and N ₂) enter atmosphere through outlet pipe (7).Because the effect of flow distributor, exhaust flow can be distributed on the whole catalyzer more equably, so not only given full play to the effect of catalyzer, and guaranteed the stressed and uniform distribution of temperature of catalyzer, reduced the catalyst breakage that thermal expansion is uneven and internal stress causes significantly, thereby improved purifying effect and working life because of catalyzer.

This purifier also can be used on the exhaust gas purification of diesel engine.

Claims

1, a kind of gasoline car exhaust purifier, comprise suction tude, shell, two solid catalysts and outlet pipe, it is characterized in that: a distributing damper has been installed between suction tude and the catalyzer, this distributing damper is the cone of being made by thin plate, on the whole conical surface, be uniform-distribution with a series of through holes, the opening of taper is relative with the inlet stream that is entered by suction tude, between two catalyzer, a baffle plate that has a series of through holes also is installed, and the conical lower portion edge of distributing damper and the side face of baffle plate be the profiling fixed installation on the internal surface of shell.

2, according to the described gasoline car exhaust purifier of claim 1, it is characterized in that: the hole of baffle plate intermediate portion is smaller and more sparse, hole on every side bigger and relatively close.