CN110743543A

CN110743543A - Three-way catalyst

Info

Publication number: CN110743543A
Application number: CN201911021681.9A
Authority: CN
Inventors: 李家宝; 冯睿鸣; 张顺
Original assignee: Individual
Current assignee: Suzhou Songzhiyuan Environmental Protection Technology Co Ltd
Priority date: 2019-10-25
Filing date: 2019-10-25
Publication date: 2020-02-04
Anticipated expiration: 2039-10-25
Also published as: CN110743543B

Abstract

The invention belongs to the technical field of catalyst preparation, and particularly relates to a three-way catalyst which comprises a filter element, a shell and a breather pipe; the vent pipe is arranged on two sides of the shell and used for inputting and discharging tail gas; the shell is designed to be hollow; the filter element is arranged in the inner cavity of the shell; the filter element is provided with catalytic holes which are uniformly distributed; the catalytic pore spiral channel design; the bottom of the shell is fixedly connected with a circulating pipe; the circulating pipe is hollow and is communicated with the inner cavity of the shell; a plurality of cleaning balls are loaded in the circulating pipe in an initial state; the surface of the cleaning ball is designed to be uneven; a filter screen is fixedly connected between the shell and the right side vent pipe; the inner cavity of the cleaning ball is filled with light inert gas; the cleaning ball is made of high-temperature resistant elastic rubber material; the invention drives the cleaning balls to circularly reciprocate in the catalytic holes and the circulating pipe by the impulsive force of the airflow so as to clean the carbon smoke attached to the surfaces of the catalytic holes and ensure the orderly catalytic reaction.

Description

Three-way catalyst

Technical Field

The invention belongs to the technical field of catalyst preparation, and particularly relates to a three-way catalyst.

Background

The main pollutants of the exhaust gas of automobiles are carbon monoxide (CO), Hydrocarbon (HC) and nitrogen oxide (NOx), and the purification of the exhaust gas can be achieved by oxidizing the carbon monoxide and the hydrocarbon into carbon dioxide (CO2), water (H2O) and simultaneously reducing the nitrogen oxide into nitrogen (N2) by using a catalyst installed in the exhaust system, which is generally called a three-way catalyst. The three-way catalyst consists of two parts: a honeycomb ceramic or metal support, and a catalyst coating attached to the support. The catalyst coating layer is generally composed of an oxide material (such as alumina) with a large specific surface area, an oxygen storage material, and a precious metal active component (often one or more of Pd (palladium), Rh (rhodium)) dispersed on the surface of the oxide or oxygen storage material. The oxygen storage material is a composite oxide containing cerium and zirconium, and the oxygen storage material can be used for adsorbing and storing oxygen in the tail gas or releasing oxygen to adjust the proportion of an oxidizing component and a reducing component in the tail gas, so that carbon monoxide and hydrocarbon are oxidized and oxynitride is reduced. In order to improve the conversion efficiency of pollutants during the cold start of an automobile, the three-way catalyst is usually arranged at a position close to the outlet of an exhaust manifold of an engine, and the bed temperature of the three-way catalyst can reach the high temperature of 900-1050 ℃ when the automobile runs at high speed.

However, when the catalytic converter used by the three-way catalyst in the prior art is used specifically, the catalyst is very sensitive to elements such as sulfur, lead, phosphorus, zinc and the like, the sulfur and the lead are from gasoline, the phosphorus and the zinc are from lubricating oil, the four substances and oxide particles formed by the four substances after the four substances are combusted in an engine are easily adsorbed on the surface of the catalyst, so that the catalyst cannot be contacted with exhaust gas, and the catalytic action, namely the poisoning phenomenon, is lost.

Disclosure of Invention

The invention provides a three-way catalyst, which aims to make up the defects of the prior art and solve the problem that the efficiency of a catalytic converter is reduced because oxide and soot are easily adsorbed on the surface of the catalyst when the catalytic converter is used.

The technical scheme adopted by the invention for solving the technical problems is as follows: the preparation method of the three-way catalyst comprises the following steps:

s1: cordierite powder is used for constructing a honeycomb carrier, and the cordierite ceramic honeycomb filter core is obtained after high-temperature firing;

s2: mixing 50g of cerium-zirconium solid solution (30 wt% of CeO2, 60 wt% of ZrO2, 5 wt% of La2O3 and 5 wt% of Y2O3), 50g of La2O3-Al2O3(La2O3 accounts for 4 wt% of La2O3-Al2O 3) and 6.90g of palladium nitrate solution (Pd content in the solution is 14.5 wt%) with a proper amount of deionized water, and preparing coating slurry after ball milling; coating the coating slurry on a filter element, and roasting at 550 ℃ for 2 hours to obtain a lower Pd coating;

s3: mixing 50g of cerium-zirconium solid solution (30 wt% of CeO2, 60 wt% of ZrO2, 5 wt% of La2O3 and 5 wt% of Y2O3), 50g of La2O3-Al2O3(La2O3 accounts for 4 wt% of La2O3-Al2O 3) and 2.00g of palladium nitrate solution (Rh content in the solution is 5.0 wt%) with a proper amount of deionized water, and preparing coating slurry after ball milling; coating the coating slurry on a filter element treated by S1, and roasting at 550 ℃ for 2 hours to obtain a middle layer Rh coating;

s4: ba (CH3COO)2 (barium acetate) aqueous solution with BaO content of 5 wt% is prepared by Ba (CH3COO)2 (barium acetate) and PVP (polyvinylpyrrolidone), 100g of the solution is coated on the filter core treated by S2, and is roasted for 2 hours at the temperature of 550 ℃, so that the alkaline earth metal oxide coating with BaO coating amount of 5g/L is obtained;

s5: loading the filter element which is coated and dried by the three layers into a tail gas processor to obtain a finished product tail gas purification device;

the tail gas purification device in the S5 comprises a filter element, a shell and a vent pipe; the vent pipe is arranged on two sides of the shell and used for inputting and discharging tail gas; the shell is designed to be hollow; the filter element is arranged in the inner cavity of the shell; the filter element is provided with catalytic holes which are uniformly distributed; the catalytic pore spiral channel design; the bottom of the shell is fixedly connected with a circulating pipe; the circulating pipe is hollow and is communicated with the inner cavity of the shell; a plurality of cleaning balls are loaded in the circulating pipe in an initial state; the surface of the cleaning ball is designed to be uneven; a filter screen is fixedly connected between the shell and the right side vent pipe;

when the automobile tail gas purifying device works, automobile tail gas is introduced into the shell through the left vent pipe, the tail gas introduced into the shell enters the filter element and enters the right vent pipe through the catalytic hole to be discharged, part of the tail gas enters the circulating pipe while being discharged, the cleaning ball in the circulating pipe is driven to enter the filter element through the pipeline, the cleaning ball falls into the lower circulating pipe at the right vent pipe after passing through the filter element by being intercepted by the filter screen, and then is recycled, the tail gas fully reacts with the PD coating, the RH coating and the alkaline earth metal oxide coating coated on the spiral hole surface of the filter element when passing through the filter element, carbon monoxide (CO), Hydrocarbon (HC) and oxynitride (NOx) contained in the tail gas are fully oxidized and reduced into carbon dioxide, water and nitrogen, the air pollutant contained in the tail gas is effectively purified, and meanwhile, the spiral design of the catalytic hole can increase the surface area of the catalytic hole, the tail gas entering the catalytic pore fully reacts to prevent harmful gas in the tail gas from contacting a coating on the surface of the catalytic pore to cause incomplete purification, simultaneously, when the tail gas passes through the catalytic pore, carbon particles, adhesive oxides and the like contained in the tail gas are extremely easy to adhere to the surface of the catalytic pore to cover the coating on the surface of the catalytic pore, so that the catalytic reaction is not thorough, the cleaning ball is impacted on the wall of the catalytic pore by the power generated when the tail gas circulates, the uneven surface of the cleaning ball is rubbed with the wall of the catalytic pore, impurities adhered on the wall of the catalytic pore are separated, so that the catalytic reaction is more thorough, meanwhile, the uneven surface of the cleaning ball is designed, the resistance of air can be reduced, the lifting force of the cleaning ball is increased, when the cleaning ball is blown by airflow in a circulating pipe, the cleaning ball has higher impact speed, and the friction force between the cleaning ball and the wall of the catalytic pore is increased, the cleaning work is more thorough.

Preferably, the inner cavity of the cleaning ball is arranged and filled with light inert gas; the cleaning ball is made of high-temperature resistant elastic rubber material; during operation, automobile exhaust passes through the breather pipe and gets into in the casing, the heat that the tail gas contains heats casing and filter core, high temperature air current makes light inert gas thermal expansion in the clean ball simultaneously, make clean ball surface area increase, make clean ball and catalysis pore wall area of contact increase, strengthen the ability that clean ball clearance catalysis pore surface impurity, make catalytic reaction go on more thoroughly, make the harmful gas content that contains in the automobile exhaust of output lower, when clean ball gets into the circulating pipe simultaneously, the temperature slowly reduces, the gaseous shrink gradually of inflation, clean ball is along with the shrink, when clean ball shrink, the impurity that clean ball surface is stained with adheres to drops, make clean ball self keep clean state, clean ball makes and can also avoid the clean ball striking damage catalytic coating when catalyzing on the pore wall for elastic rubber material simultaneously.

Preferably, the right side of the ventilation pipe is fixedly connected with a first wind wheel through a guide rod; the air pipe is positioned below the first wind wheel and fixedly connected with an air box; the air box is arranged in a hollow manner and is communicated with the vent pipe; a second wind wheel is rotationally connected in the wind box; the first wind wheel and the second wind wheel are both composed of fan blades and a gear ring; the fan blades are fixedly connected to the inner side of the gear ring; the two gear rings are mutually meshed; one side of the air box, which is close to the circulating pipe, is fixedly connected with a ventilating pipe which is communicated with the circulating pipe; the surface of one side of the air box, which is far away from the circulating pipe, is uniformly opened; when the device works, when tail gas is discharged through the vent pipe on the right side, the airflow drives the fan blades on the first wind wheel to rotate, so as to drive the first wind wheel to rotate, the second wind wheel reversely rotates through the transmission of the mutually meshed gear rings, the second wind wheel reversely rotates inputs airflow into the circulating pipe through the vent pipe, the accelerating effect on the airflow in the circulating pipe is achieved, the thrust on the cleaning ball is larger, the friction effect of the cleaning ball is enhanced, meanwhile, the airflow blown by the second wind wheel is external airflow which flows into an opening on one side of the air box, the temperature of the external airflow is lower than that of the tail gas, the cleaning ball can be effectively cooled, the impurity removal capability of the cleaning ball is smoother, meanwhile, the airflow can also cool the whole device, the phenomenon that the temperature of the ceramic filter core is too high, the coating in a catalytic hole is continuously baked at high temperature, the purification effect of the filter element is prevented from being reduced, and the overall performance of the device is prevented from being reduced.

Preferably, the lower surface of the circulating pipe is provided with an opening; a filter box is arranged at the opening of the circulating pipe; the filter box is designed to be close to an opening on one side of the circulating pipe; a sliding groove is formed in the inner wall of the filter box close to the opening; the filter box is fixedly connected with a first interception net above the sliding chute; a second interception net is connected in the sliding groove in a sliding manner; when meshes of the first interception net and the second interception net are staggered in an initial state, the diameter of the meshes is smaller than that of the cleaning balls, and when the meshes of the first interception net and the second interception net are overlapped, the diameter of the meshes is larger than that of the cleaning balls; when the cleaning ball cleaning device works, when the filter box is loaded on the lower surface of the circulating pipe, the meshes of the first interception net and the second interception net are staggered, so that the cleaning ball can be effectively prevented from entering the filter box and simultaneously impurities such as carbon particles, adhesive oxides and the like falling into the circulating pipe along with the cleaning ball can be effectively collected, meanwhile, when the cleaning ball is used for a long time, the surface of the cleaning ball can be infected with impurities which are difficult to clean, at the moment, the second interception net in the chute slides, the meshes of the second interception net are coincided with the meshes of the first interception net, the cleaning ball falls into the filter box, the filter box is taken down, the meshes of the second filter screen are staggered with the meshes of the first interception net again, a high-pressure water gun is used for flushing the filter box to complete the cleaning work of the cleaning ball and the filter box, the arrangement of the adjustable meshes of the double-layer interception nets enables the cleaning work to be easier, the cleaning work is avoided being inconvenient when the cleaning ball is, under the drive of wind power in the circulating pipe, the cleaning balls can automatically enter the circulating pipe, so that the cleaning and loading of the cleaning balls are more urgent and smooth.

Preferably, the inner wall of the circulating pipe is fixedly connected with impact plates which are uniformly arranged; the impact plates are designed in an inclined mode, and the multiple impact plates are arranged in a staggered mode; the impact plate is made of elastic metal material; the during operation, the reciprocating motion of continuous circulation is in circulating pipe and casing to the cleaning ball under the drive of air current, when the cleaning ball moved in the circulating pipe, evenly distributed's striking board can effectively intercept the cleaning ball, make cleaning ball and metal sheet take place the striking, make the cleaning ball produce the vibration, be stained with the impurity that attaches on the cleaning ball surface and shake and fall, can effectively strengthen the clean effect of cleaning ball, the setting of striking board simultaneously can also avoid the impurity that gets into in the circulating pipe together with the cleaning ball under the drive of air current directly gets into the filter core again without the filter screen, make the filter core contaminated once more.

Preferably, the right side surface of the impact plate is uniformly designed with convex points; the during operation, striking plate surface bump design when can effectively making clean ball and striking plate strike, reinforcing striking effect makes the more thorough that clean ball surface impurity drops, makes the device wholeness more superior, and the bump design makes the impact force dispersion of clean ball and striking plate simultaneously, avoids striking plate atress to damage.

The invention has the following beneficial effects:

1. according to the three-way catalyst, the cleaning balls and the catalytic holes are arranged, and the cleaning balls perform circular reciprocating motion in the circulating pipe and the catalytic holes of the filter element, so that the cleaning balls and the catalytic hole walls generate friction, oxides and soot adhered to the catalytic hole walls are cleaned, the purification effect of the tail gas purification device is enhanced, and meanwhile, the second wind wheel blows air into the circulating pipe by utilizing the airflow impulse force generated when tail gas is discharged through the transmission between the first wind wheel and the second wind wheel, the integral temperature of the device is reduced, and the device performance is more excellent.

2. According to the three-way catalyst, the impact plate, the filter box and the double-layer intercepting net are arranged, so that the cleaning balls are impacted and vibrated when circulating in the circulating pipe, impurities attached to the surfaces of the cleaning balls are enabled to fall off, meanwhile, the filter box is used for collecting, and meanwhile, the meshes of the double-layer intercepting net are controllable, so that the meshes can be adjusted when needed, and therefore the cleaning and loading of the cleaning balls are more convenient and rapid.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a flow chart of a method of the present invention;

fig. 2 is a perspective view of an exhaust gas purifying device;

fig. 3 is a sectional view of an exhaust gas purifying device;

FIG. 4 is a perspective view of the filter cassette;

in the figure: the device comprises a filter element 1, a shell 2, a vent pipe 3, a catalytic hole 11, a circulating pipe 4, a cleaning ball 41, a filter screen 42, a wind box 5, a guide rod 51, a first wind wheel 52, a second wind wheel 53, fan blades 54, a gear ring 55, a vent pipe 56, a filter box 6, a chute 7, a first interception net 71, a second interception net 72 and an impact plate 8.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 4, the preparation method of the three-way catalyst of the present invention comprises the following steps:

the tail gas purification device in the S5 comprises a filter element 1, a shell 2 and a vent pipe 3; the vent pipe 3 is arranged on two sides of the shell 2 and used for inputting and discharging tail gas; the housing 2 is hollow; the filter element 1 is arranged in the inner cavity of the shell 2; the filter element 1 is provided with uniformly distributed catalytic holes 11; the catalytic hole 11 is designed as a spiral channel; the bottom of the shell 2 is fixedly connected with a circulating pipe 4; the circulating pipe 4 is hollow and the circulating pipe 4 is communicated with the inner cavity of the shell 2; a plurality of cleaning balls 41 are loaded in the circulating pipe 4 in the initial state; the surface of the cleaning ball 41 is designed to be uneven; a filter screen 42 is fixedly connected between the shell 2 and the right side vent pipe 3;

when the automobile exhaust purification device works, automobile exhaust is introduced into the shell 2 through the left side vent pipe 3, the exhaust introduced into the shell 2 enters the filter element 1 and enters the right side vent pipe 3 through the catalytic hole 11 to be discharged, part of the exhaust enters the circulating pipe 4 while the exhaust is discharged, the cleaning ball 41 in the circulating pipe 4 is driven to enter the filter element 1 through a pipeline, the cleaning ball 41 passes through the filter element 1 along with the exhaust and then falls into the lower circulating pipe 4 at the position of the right side vent pipe 3 by being intercepted by the filter screen 42, the recirculation operation is carried out, the exhaust fully reacts with the PD coating, the RH coating and the alkaline earth metal oxide coating coated on the spiral hole surface of the filter element 1 when passing through the filter element 1, carbon monoxide (CO), Hydrocarbon (HC) and nitrogen oxide (NOx) contained in the exhaust are fully oxidized and reduced into carbon dioxide, water and nitrogen, and air pollutants contained in the exhaust are effectively purified, meanwhile, the spiral design of the catalytic hole 11 can increase the surface area of the catalytic hole 11, so that the tail gas entering the catalytic hole 11 can fully react, thereby preventing harmful gas in the tail gas from contacting the coating on the surface of the catalytic hole 11 and causing incomplete purification, meanwhile, when the tail gas passes through the catalytic hole 11, carbon particles, adhesive oxides and the like contained in the tail gas are extremely easy to adhere to the surface of the catalytic hole 11 and cover the coating on the surface of the catalytic hole 11, so that the catalytic reaction is not complete, the cleaning ball 41 is arranged to impact the cleaning ball 41 on the wall of the catalytic hole 11 through the power generated during tail gas circulation, so that the uneven surface of the cleaning ball 41 is rubbed with the wall of the catalytic hole 11, so that the impurities adhered to the wall of the catalytic hole 11 fall off, the catalytic reaction is more complete, meanwhile, the uneven design of the surface of the cleaning ball 41 can reduce the resistance of air and increase the lifting force of the cleaning ball 41, so that the cleaning ball 41 is blown by airflow in the, has faster impact speed, increases the friction force between the cleaning balls 41 and the walls of the catalytic holes 11, and leads the cleaning work to be more thorough.

As an embodiment of the invention, the inner cavity of the cleaning ball 41 is arranged and the inner cavity of the cleaning ball 41 is filled with light inert gas; the cleaning ball 41 is made of high-temperature resistant elastic rubber material; when in work, the automobile exhaust enters the shell 2 through the vent pipe 3, the shell 2 and the filter element 1 are heated by the heat contained in the exhaust, meanwhile, the light inert gas in the cleaning ball 41 is heated and expanded by the high-temperature airflow, so that the surface area of the cleaning ball 41 is increased, the contact area of the cleaning ball 41 and the wall of the catalytic hole 11 is increased, the capability of the cleaning ball 41 for cleaning impurities on the surface of the catalytic hole 11 is enhanced, the catalytic reaction is carried out more thoroughly, the content of harmful gas in the output automobile exhaust is lower, meanwhile, when the cleaning ball 41 enters the circulating pipe 4, the temperature is slowly reduced, the expanded gas gradually contracts, the cleaning ball 41 contracts, and when the cleaning ball 41 contracts, impurities adhered to the surface of the cleaning ball 41 fall off, so that the cleaning ball 41 keeps a clean state, meanwhile, the cleaning ball 41 is made of elastic rubber material, so that the cleaning ball 41 can be prevented from damaging the catalytic coating when impacting on the wall of the catalytic hole 11.

As an embodiment of the present invention, a first wind wheel 52 is fixedly connected to the right side of the air pipe 3 through a guide rod 51; the air pipe 3 is fixedly connected with an air box 5 below the first wind wheel 52; the air box 5 is arranged in a hollow manner and is communicated with the vent pipe 3; a second wind wheel 53 is rotationally connected in the wind box 5; the first wind wheel 52 and the second wind wheel 53 are both composed of fan blades 54 and a gear ring 55; the fan blades 54 are fixedly connected to the inner side of the gear ring 55; the two gear rings 55 are mutually engaged; a vent pipe 56 is fixedly connected to one side of the air box 5 close to the circulating pipe 4, and the vent pipe 56 is communicated with the circulating pipe 4; the air box 5 is uniformly opened on the surface of one side away from the circulating pipe 4; when the device works, when tail gas is discharged through the right-side vent pipe 3, the airflow drives the fan blades 54 on the first wind wheel 52 to rotate, so as to drive the first wind wheel 52 to rotate, the second wind wheel 53 rotates reversely through the transmission of the meshed gear rings 55, the airflow is input into the circulating pipe 4 through the vent pipe 56 by the second wind wheel 53 rotating reversely, the acceleration effect on the airflow in the circulating pipe 4 is achieved, the thrust on the cleaning ball 41 is larger, the friction effect of the cleaning ball 41 is enhanced, meanwhile, the airflow blown by the second wind wheel 53 is the external airflow which flows into the opening on one side of the air box 5, the external airflow temperature is lower than the tail gas temperature, the cleaning ball 41 can be effectively cooled, the impurity removal capability of the cleaning ball 41 per se can be carried out more smoothly, meanwhile, the whole device can be cooled by the airflow, under the condition that the tail gas is continuously heated, the temperature of the ceramic filter core 1 is too high, so that the inner, the phenomenon of peeling off is generated, the reduction of the purifying effect of the filter element 1 is avoided, and the integral performance of the device is reduced.

As an embodiment of the present invention, the lower surface of the circulation pipe 4 is provided with an opening; a filter box 6 is arranged at the opening of the circulating pipe 4; the filter box 6 is designed to be opened at one side close to the circulating pipe 4; a chute 7 is arranged on the inner wall of the filter box 6 close to the opening; a first interception net 71 is fixedly connected above the chute 7 of the filter box 6; a second interception net 72 is connected in the chute 7 in a sliding way; when meshes of the first interception net 71 and the second interception net 72 are staggered in an initial state, the diameter of the meshes is smaller than that of the cleaning balls 41, and when the meshes of the first interception net 71 and the second interception net 72 are overlapped, the diameter of the meshes is larger than that of the cleaning balls 41; when the cleaning device works, when the filter box 6 is loaded on the lower surface of the circulating pipe 4, the meshes of the first interception net 71 and the second interception net 72 are staggered, so that the cleaning ball 41 can be effectively prevented from entering the filter box 6, impurities such as carbon particles, adhesive oxides and the like falling into the circulating pipe 4 along with the cleaning ball 41 can be effectively collected, meanwhile, when the cleaning ball 41 is used for a long time, the surface of the cleaning ball 41 can be contaminated by impurities which are difficult to clean, at the moment, the second interception net 72 in the sliding groove 7 slides, so that the meshes of the second interception net 72 are overlapped with the meshes of the first interception net 71, the cleaning ball 41 falls into the filter box 6, the filter box 6 is taken down, the meshes of the second filter screen 42 are staggered with the meshes of the first interception net 71, the cleaning work on the cleaning ball 41 and the filter box 6 can be finished by flushing water into the filter box 6 by using a high-pressure water gun, and the arrangement of the, the inconvenience of cleaning the cleaning balls 41 is avoided, and meanwhile, when the cleaning balls 41 are loaded, only the meshes of the first interception net 71 and the second interception net 72 need to be overlapped, and the cleaning balls 41 can automatically enter the circulating pipe 4 under the driving of wind power in the circulating pipe 4, so that the cleaning and loading of the cleaning balls 41 are more urgent and smooth.

As an embodiment of the invention, the inner wall of the circulating pipe 4 is fixedly connected with impact plates 8 which are uniformly arranged; the impact plates 8 are designed in an inclined mode, and the multiple impact plates 8 are arranged in a staggered mode; the impact plate 8 is made of elastic metal material; when the cleaning ball device works, the cleaning balls 41 continuously and circularly reciprocate in the circulating pipe 4 and the shell 2 under the drive of air flow, when the cleaning balls 41 move in the circulating pipe 4, the uniformly distributed impact plates 8 can effectively intercept the cleaning balls 41, so that the cleaning balls 41 and the metal plate are impacted, the cleaning balls 41 vibrate, impurities attached to the surfaces of the cleaning balls 41 are vibrated, the cleaning effect of the cleaning balls 41 can be effectively enhanced, and meanwhile, the arrangement of the impact plates 8 can also prevent the impurities which enter the circulating pipe 4 together with the cleaning balls 41 from directly entering the filter core 1 again without passing through the filter screen 42 under the drive of the air flow, so that the filter core 1 is polluted again.

As an embodiment of the present invention, the right surface of the striking plate 8 is uniformly convex in design; during operation, 8 surperficial bump designs of striking plate can effectively make clean ball 41 and striking plate 8 when striking, reinforcing striking effect makes the more thorough that 41 surperficial impurity of clean ball drop, makes the device wholeness more superior, and the bump design makes clean ball 41 and 8 impact force dispersion of striking plate simultaneously, avoids 8 atress damages of striking plate.

The specific implementation flow is as follows:

when the automobile exhaust purifier works, automobile exhaust is introduced into the shell 2 through the left vent pipe 3, the exhaust introduced into the shell 2 enters the filter core 1 and enters the right vent pipe 3 through the catalytic hole 11 to be discharged, part of the exhaust enters the circulating pipe 4 while the exhaust is discharged, and the cleaning ball 41 in the circulating pipe 4 is driven to enter the filter core 1 through a pipeline, the cleaning ball 41 passes through the filter core 1 along with the exhaust and then is intercepted by the filter screen 42 at the right vent pipe 3 and falls into the lower circulating pipe 4, meanwhile, when the exhaust is discharged through the right vent pipe 3, the air flow drives the fan blades 54 on the first air wheel 52 to rotate, so as to drive the first air wheel 52 to rotate, the second air wheel 53 rotates reversely through the transmission of the mutually meshed gear rings 55, the reversely rotating second air wheel 53 inputs the air flow into the circulating pipe 4 through the air flow 56, and plays an accelerating effect on the air flow in the circulating pipe 4, so that, when moving in the circulating pipe 4, the cleaning balls 41 impact on the impact plates 8 which are uniformly arranged, so that the cleaning balls 41 vibrate, impurities adhered to the surfaces of the cleaning balls 41 fall off, and the cleaning work is more thorough.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A three-way catalyst is characterized in that the preparation method comprises the following steps:

the tail gas purification device in the S5 comprises a filter element (1), a shell (2) and a vent pipe (3); the vent pipe (3) is arranged on two sides of the shell (2) and used for inputting and discharging tail gas; the housing (2) is hollow; the filter element (1) is arranged in the inner cavity of the shell (2); the filter element (1) is provided with catalytic holes (11) which are uniformly distributed; the catalytic pore (11) is designed as a spiral channel; the bottom of the shell (2) is fixedly connected with a circulating pipe (4); the circulating pipe (4) is designed in a hollow mode, and the circulating pipe (4) is communicated with the inner cavity of the shell (2); a plurality of cleaning balls (41) are loaded in the circulating pipe (4) in an initial state; the surface of the cleaning ball (41) is designed to be uneven; a filter screen (42) is fixedly connected between the shell (2) and the right side vent pipe (3).

2. A three-way catalyst according to claim 1, wherein: the inner cavity of the cleaning ball (41) is arranged and filled with light inert gas; the cleaning ball (41) is made of high-temperature resistant elastic rubber materials.

3. A three-way catalyst according to claim 1, wherein: a first wind wheel (52) is fixedly connected in the right air pipe (3) through a guide rod (51); the air pipe (3) is positioned below the first wind wheel (52) and is fixedly connected with an air box (5); the air box (5) is arranged in a hollow manner and is communicated with the vent pipe (3); a second wind wheel (53) is rotationally connected in the wind box (5); the first wind wheel (52) and the second wind wheel (53) are both composed of fan blades (54) and a gear ring (55); the fan blades (54) are fixedly connected to the inner side of the gear ring (55); the two gear rings (55) are mutually meshed; one side of the air box (5) close to the circulating pipe (4) is fixedly connected with a ventilating pipe (56), and the ventilating pipe (56) is communicated with the circulating pipe (4); the surface of one side of the air box (5) far away from the circulating pipe (4) is evenly opened.

4. A three-way catalyst according to claim 1, wherein: the lower surface of the circulating pipe (4) is provided with an opening; a filter box (6) is arranged at the opening of the circulating pipe (4); the filter box (6) is designed to be provided with an opening at one side close to the circulating pipe (4); a sliding groove (7) is formed in the inner wall of the filter box (6) close to the opening; the filter box (6) is fixedly connected with a first interception net (71) above the chute (7); a second interception net (72) is connected in the sliding chute (7) in a sliding way; when meshes of the first interception net (71) and the second interception net (72) are staggered in an initial state, the diameter of the meshes is smaller than that of the cleaning balls (41), and when the meshes of the first interception net (71) and the second interception net (72) are overlapped, the diameter of the meshes is larger than that of the cleaning balls (41).

5. A three-way catalyst according to claim 1, wherein: the inner wall of the circulating pipe (4) is fixedly connected with impact plates (8) which are uniformly arranged; the impact plates (8) are designed in an inclined mode, and the multiple impact plates (8) are arranged in a staggered mode; the impact plate (8) is made of elastic metal material.

6. A three-way catalyst according to claim 1, wherein: the right side surface of the impact plate (8) is uniformly designed with convex points.