CN114087053A

CN114087053A - Three-way catalyst for automobile

Info

Publication number: CN114087053A
Application number: CN202111360726.2A
Authority: CN
Inventors: 杨桃
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2022-02-25

Abstract

The invention relates to the technical field of intelligent automobiles and discloses an automobile three-way catalyst, which comprises a shell, wherein a partition plate is fixedly connected inside the shell, and one end of a heat insulation plate is fixedly connected with a supporting plate fixedly connected with the inner wall of the shell. Through temperature sensor, the bellows, the baffle, the setting of capillary, when the inside high temperature of three way catalyst converter, temperature sensor can transmit the signal of telecommunication, make the electro-magnet circular telegram produce magnetism, make the clear water get into the transition intracavity portion from the outlet pipe, wet hydrophobic piece, when the high-speed tail gas air current flows through from capillary one end export among the inside gas passage of casing, the atmospheric pressure difference at capillary both ends can make the capillary with the water suction of transition intracavity, the water that enters into in the casing gas passage can be dispersed into more tiny granule, dispersion degree in the casing gas passage is bigger, can further absorb the heat fast, reach the effect of rapid cooling, avoid the temperature too high in this three way catalyst converter, influence ceramic carrier's efficiency.

Description

Three-way catalyst for automobile

Technical Field

The invention relates to the technical field of intelligent automobiles, in particular to an automobile three-way catalyst.

Background

The three-way catalyst is the most important external purifying device in the automobile exhaust emission system, and can convert harmful gases such as CO, HC, NOx and the like discharged by automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction. The working principle is as follows: when high-temperature automobile exhaust passes through the purification device, the purifying agent in the three-way catalyst enhances the activity of three gases of CO, HC and NOx to promote the three gases to carry out certain oxidation-reduction chemical reaction, wherein CO is oxidized into colorless and nontoxic carbon dioxide gas at high temperature; HC compounds are oxidized at high temperature to water and carbon dioxide; NOx is reduced to nitrogen and oxygen. Three kinds of harmful gases are changed into harmless gases, so that the automobile exhaust can be purified. The three-way catalytic converter mainly works by a ceramic carrier, noble metal catalysts such as platinum, rhodium and palladium are attached to the ceramic carrier, and when automobile exhaust passes through the ceramic carrier, the activity of CO, NOX and HC is enhanced under the action of high-temperature catalysis, and oxidation-reduction reaction is carried out.

However, the conventional three-way catalyst has the following defects in the working process: firstly, because the three-way catalytic converter has no catalytic capability at normal temperature, the catalyst of the three-way catalytic converter has oxidation or reduction capability only by heating to a certain temperature, and the initial working temperature of the catalytic converter is usually 250-350 ℃, and the normal working temperature is usually 400-800 ℃. However, the conventional automobile directly emits exhaust gas at the initial stage of operation, which results in that the exhaust gas is directly emitted to the atmosphere without undergoing a catalytic oxidation-reduction reaction in the operating temperature period from low temperature to 250 ℃, and the quality of the atmospheric environment is seriously affected by the automobile exhaust gas; secondly, when the catalytic converter works, a large amount of heat is generated, the oxidation temperature is higher, when the temperature exceeds 1000 ℃, the catalyst of the inner coating layer is sintered and necrotized, and meanwhile, the vehicle spontaneous combustion accident is very easy to happen, so that attention must be paid to prevent the efficiency of the catalytic converter from being influenced by overhigh exhaust temperature.

Disclosure of Invention

Aiming at the defects of the background technology, the invention provides the three-way catalyst for the automobile, which has the advantages of avoiding the direct emission of waste gas, preventing the exhaust temperature from being overhigh and ensuring the normal work of the ceramic carrier, and solves the problems in the background technology.

The invention provides the following technical scheme: a three-way catalytic converter for an automobile comprises a shell, wherein a heat insulation plate is fixedly connected inside the shell, one end of the heat insulation plate is fixedly connected with a supporting plate fixedly connected with the inner wall of the shell, a ceramic carrier is fixedly installed inside the heat insulation plate, a temperature sensor is fixedly installed at the bottom of the inner wall of one end of the heat insulation plate, a first electromagnetic valve is fixedly connected at the middle part of one end of the supporting plate, four groups of backflow pipes which are arranged in a uniform circumference manner are fixedly connected at the outer side of the middle part of one end of the supporting plate, a second electromagnetic valve is arranged at one end, close to the supporting plate, of the backflow pipe, an annular cavity which is arranged inside the shell is arranged at the outer side of one end of the supporting plate, eight groups of supporting springs which are arranged in a uniform circumference manner are fixedly connected at the middle part of the inner wall of the annular cavity, an arc-shaped supporting plate is fixedly connected at the other end of the arc-shaped supporting plate, which faces the supporting plate, is fixedly connected with an air bag, the two ends of the air bag are fixedly connected with bases fixedly connected with the heat insulation plate, one side, close to the ceramic carrier, of the interior of the heat insulation plate is provided with a plurality of groups of first guide pipes which are arranged at equal intervals, and the other ends of the first guide pipes are communicated with the bottoms of the bases on the side far away from the supporting plate.

Preferably, a partition board is fixedly mounted at one end inside the shell, a water storage cavity is formed between the outer side of the partition board and the shell, clear water is filled inside the water storage cavity, a transition cavity is formed between the inner side of the partition board and the heat insulation board, a hydrophobic block fixedly mounted on the heat insulation board is arranged at the inner side of the transition cavity, a plurality of capillaries arranged side by side are fixedly mounted at the inner side of the hydrophobic block, four groups of piston cavities arranged in the same circumference are arranged at one side of the partition board, a fixed plate fixedly connected with the partition board is fixedly mounted at one end of each piston cavity, an electromagnet is fixedly mounted inside the fixed plate and electrically connected with the temperature sensor, a corrugated pipe is fixedly connected at one end of the fixed plate, a movable plate movably sleeved with the piston cavities is fixedly connected at the other end of the corrugated pipe, and the movable plate is made of an iron material, the one end fixedly connected with other end and fixed plate fixed connection's reset spring of fly leaf, the bellows is close to the one end of fixed plate and is provided with the heat conduction ring, the heat conduction ring is close to one side fixedly connected with heat conduction piece of heat insulating board, the one end of heat conduction piece runs through the heat insulating board to with heat insulating board inner wall parallel and level, the inlet tube that runs through the baffle and be linked together with the water storage chamber is seted up to one side at fixed plate middle part, the outlet pipe that runs through the baffle and be linked together with the transition chamber is seted up to the opposite side at fixed plate middle part.

Preferably, the one end that the capillary is close to hydrophobic piece is provided with thermal-insulated picture peg, and the capillary tip inserts in the picture peg, the inside of outlet pipe is provided with the check valve, the inside check valve opening of outlet pipe is inside towards the transition chamber.

Preferably, the outside of the other end of the piston cavity is provided with an air inlet pipe arranged at the middle part of the shell, the inner side of the other end of the piston cavity is provided with a second conduit arranged in the inner wall of the heat insulation plate, the other end of the second conduit is communicated with the gas channel inside the shell, the inside of the air inlet pipe is provided with a check valve with an opening facing the inside of the piston cavity, and one end of the second conduit is provided with a check valve with an opening facing the gas channel inside the shell.

Preferably, the temperature sensor is respectively electrically connected with the first electromagnetic valve and the second electromagnetic valve, the air bag is made of flame-retardant rubber with better flexibility, and the curvature of the arc support plate is the same as the excircle curvature of the heat insulation plate.

The invention has the following beneficial effects:

1. through the arrangement of the temperature sensor, the return pipe, the air bag and the first conduit, when the temperature sensor detects that the temperature of the tail gas passing through the ceramic carrier at the moment does not reach a preset value, the tail gas at the moment can enter the air bag along the return pipe, the temperature is gradually increased along with the inside of the exhaust pipe, the tail gas inside the air bag is also gradually increased, the air bag is also expanded by the tail gas, when the temperature sensor detects that the temperature of the tail gas passing through the ceramic carrier reaches the preset value, the second electromagnetic valves are closed, the first electromagnetic valve is opened, so that the tail gas inside the exhaust pipe can be filtered and catalyzed by the ceramic carrier and then discharged, meanwhile, because the first electromagnetic valve is opened, the air pressure inside the three-way catalyst is balanced, so that the air bag is flattened under the rebound action of the supporting spring, the tail gas inside the air bag is discharged from the first conduit at the front end of the ceramic carrier, and all the tail gas can be catalytically oxidized by the ceramic carrier at the preset temperature, ensuring that the tail gas can be purified by the ceramic carrier.

2. Through the intake pipe, the piston chamber, the fly leaf, the setting of second pipe, at initial tail gas entering stage, get into from the casing front end constantly along with high temperature tail gas, the heat conduction piece is heated and constantly with heat transfer to the bellows inside, make the inside liquid evaporation of bellows, make the inside atmospheric pressure increase of bellows, thereby make the bellows extend to the right side inflation, can make the fly leaf remove to the right side, with fly leaf right side piston chamber in the air follow second pipe extrusion get into the inside gas passage of casing, can be when initial stage first solenoid valve is closed, to the inside supplementary oxygen of this three way catalyst converter, ensure that its inside material that needs oxidation reaction thoroughly reacts, further improve tail gas purification treatment performance.

3. Through temperature sensor, the bellows, the baffle, the setting of capillary, when temperature sensor detects the inside high temperature of this three way catalyst converter, temperature sensor can transmit the signal of telecommunication, make the electro-magnet circular telegram produce magnetism, through the inside clear water of fly leaf extrusion bellows, make it get into inside the transition chamber from the outlet pipe, moist hydrophobic block, when the high-speed tail gas air current flows through from capillary one end export in the inside gas passage of casing, the atmospheric pressure difference at capillary both ends can make the capillary with the water suction of transition intracavity, the water that enters into in the casing gas passage can be dispersed into more tiny granule, dispersion degree in casing gas pipeline is bigger, can further absorb the heat fast, reach the effect of rapid cooling, avoid the temperature too high in this three way catalyst converter, influence ceramic carrier's efficiency.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic cross-sectional view of structure A-A of the present invention;

FIG. 3 is an enlarged view of the structure B of the present invention;

FIG. 4 is a schematic cross-sectional view of structure C-C of the present invention;

FIG. 5 is a schematic cross-sectional view of structure D-D of the present invention.

In the figure: 1. a housing; 2. a heat insulation plate; 3. a support plate; 4. a ceramic carrier; 5. a temperature sensor; 6. a first solenoid valve; 7. a return pipe; 71. a second solenoid valve; 8. an annular cavity; 9. a support spring; 10. an arc-shaped support plate; 11. an air bag; 12. a base; 121. a first conduit; 13. a partition plate; 14. a water storage cavity; 15. a transition chamber; 16. a hydrophobic block; 17. a capillary tube; 18. a piston cavity; 19. a fixing plate; 20. an electromagnet; 21. a bellows; 22. a movable plate; 23. a return spring; 24. a heat conducting block; 25. a water inlet pipe; 26. a water outlet pipe; 27. an air inlet pipe; 28. a second conduit.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, a three-way catalyst for an automobile comprises a housing 1, a heat insulation plate 2 fixedly connected to the inside of the housing 1, the heat insulation plate 2 being cylindrical, a support plate 3 fixedly connected to the inner wall of the housing 1 and fixedly connected to one end of the heat insulation plate 2, a ceramic carrier 4 fixedly mounted to the inside of the heat insulation plate 2, a temperature sensor 5 fixedly mounted to the bottom of the inner wall of one end of the heat insulation plate 2, a first solenoid valve 6 fixedly connected to the middle of one end of the support plate 3, the first solenoid valve 6 facing the air outlet of the housing 1, four sets of return pipes 7 arranged in equal circumference and fixedly connected to the outer side of the middle of one end of the support plate 3, a second solenoid valve 71 arranged at one end of the return pipes 7 close to the support plate 3, an annular chamber 8 arranged in the housing 1 and eight sets of support springs 9 arranged in equal circumference and fixedly connected to the middle of the inner wall of the annular chamber 8, the other end of the supporting spring 9 is fixedly connected with an arc-shaped supporting plate 10, one end of the arc-shaped supporting plate 10, which faces the supporting plate 3, is fixedly connected with an air bag 11, two ends of the air bag 11 are fixedly connected with bases 12 which are fixedly connected with the heat insulating plate 2, one side, close to the ceramic carrier 4, of the interior of the heat insulating plate 2 is provided with a plurality of groups of first guide pipes 121 which are arranged at equal intervals, and the other end of each first guide pipe 121 is communicated with the bottom of the base 12 at one side, which is far away from the supporting plate 3;

referring to fig. 1, 3, 4 and 5, a partition plate 13 is fixedly installed at one end inside a casing 1, a water storage cavity 14 is formed between the outer side of the partition plate 13 and the casing 1, clear water is filled inside the water storage cavity 14, a transition cavity 15 is formed between the inner side of the partition plate 13 and a heat insulation plate 2, a hydrophobic block 16 fixedly installed on the heat insulation plate 2 is arranged inside the transition cavity 15, a plurality of capillary tubes 17 are arranged side by side and fixedly installed inside the hydrophobic block 16, a heat insulation insertion plate is arranged at one end of each capillary tube 17 close to the corresponding hydrophobic block 16, the end of each capillary tube 17 is inserted into the insertion plate, four groups of piston cavities 18 which are arranged in the casing 1 in an equal circumferential arrangement are arranged at one side of the partition plate 13, a fixing plate 19 fixedly connected with the partition plate 13 is fixedly installed at one end of each piston cavity 18, an electromagnet 20 is fixedly installed inside the fixing plate 19, the electromagnet 20 is electrically connected with a temperature sensor 5, and a corrugated tube 21 is fixedly connected with one end of each fixing plate 19, the other end of the corrugated pipe 21 is fixedly connected with a movable plate 22 movably sleeved with the piston cavity 18, the movable plate 22 is made of iron material, one end of the movable plate 22 is fixedly connected with a return spring 23, the other end of the movable plate is fixedly connected with a fixed plate 19, one end of the corrugated pipe 21 close to the fixed plate 19 is provided with a heat conduction ring, one side of the heat conduction ring close to the heat insulation plate 2 is fixedly connected with a heat conduction block 24, one end of the heat conduction block 24 penetrates through the heat insulation plate 2 and is flush with the inner wall of the heat insulation plate 2, one side of the middle part of the fixed plate 19 is provided with a water inlet pipe 25 penetrating through the partition plate 13 and communicated with the water storage cavity 14, the other side of the middle part of the fixed plate 19 is provided with a water outlet pipe 26 penetrating through the partition plate 13 and communicated with the transition cavity 15, a check valve is arranged inside the water outlet pipe 26, the opening of the check valve inside the water outlet pipe 26 faces the transition cavity 15, and clean water can be supplemented from the inside of the water storage cavity 14 when the corrugated pipe 21 is heated, when the temperature in the three-way catalyst is too high, water drops are conveniently sprayed into the gas channel in the shell 1 through the capillary tube 17 for cooling, so that the three-way catalyst is prevented from being damaged by high temperature and the efficiency of the three-way catalyst is prevented from being influenced;

referring to fig. 1, an air inlet pipe 27 installed in the middle of the housing 1 is disposed outside the other end of the piston cavity 18, a second conduit 28 opened in the inner wall of the heat insulation board 2 is disposed inside the other end of the piston cavity 18, the other end of the second conduit 28 is communicated with the internal gas passage of the housing 1, a check valve having an opening facing the internal of the piston cavity 18 is disposed inside the air inlet pipe 27, a check valve having an opening facing the internal gas passage of the housing 1 is disposed at one end of the second conduit 28, when the electromagnet 20 is energized to generate magnetism at a high temperature, the movable plate 22 moves toward one side of the fixed plate 19 to replenish clean water into the transition cavity 15, so as to facilitate the absorption of liquid from the capillary 17 by the bernoulli principle for cooling, and at the same time, when the automobile stops operating and the exhaust gas gradually decreases, and the air pressure inside the bellows 21 decreases, the movable plate 22 also moves toward one side of the fixed plate 19, at this time, because the gas flow rate inside the gas pipeline inside the casing 1 is small or even zero, the clean water cannot be sucked out from the capillary tube 17, so that the clean water inside the bellows 21 will return to the water storage chamber 14 at this time.

Referring to fig. 2, the temperature sensor 5 is electrically connected to the first solenoid valve 6 and the second solenoid valve 71, respectively, the air bag 11 is made of flame retardant rubber with good flexibility, the curvature of the arc-shaped support plate 10 is the same as the curvature of the outer circle of the heat insulation plate 2, by the arrangement of the air bag 11, the exhaust gas which does not reach the preset temperature in the initial stage can be accommodated, the exhaust gas is prevented from being directly discharged, adversely affects the environment, and at the same time, is capable of discharging the exhaust gas contained in the interior of the air bag 11 from the front end of the ceramic carrier 4 when the internal temperature of the three-way catalyst reaches a predetermined value, facilitating the unpurified exhaust gas to pass through the ceramic carrier 4 again, ensuring that all the exhaust gas is purified, meanwhile, the curvature of the arc support plate 10 is the same as the excircle curvature of the heat insulation plate 2, so that the arc support plate 10 can be tightly attached to the outer ring of the heat insulation plate 2 when the air bag 11 is extruded, and the waste gas in the air bag 11 is extruded out to the maximum extent.

The working principle is that after the automobile is started, the temperature sensor 5 is electrified to start working, meanwhile, tail gas enters from one end of the three-way catalyst shell 1, when the temperature sensor 5 detects that the temperature of the tail gas passing through the ceramic carrier 4 at the moment does not reach a preset value, the temperature sensor 5 transmits an electric signal to enable the second electromagnetic valves 71 to be opened, the tail gas at the moment can enter the air bag 11 along the return pipe 7, along with the gradual temperature rise in the exhaust pipe, the tail gas in the air bag 11 is gradually increased, the air bag 11 is also increased by the tail gas, when the temperature sensor 5 detects that the temperature of the tail gas passing through the ceramic carrier 4 reaches the preset value, the temperature sensor 5 sends out the electric signal again to enable the second electromagnetic valves 71 to be closed, the first electromagnetic valve 6 is opened, so that the tail gas in the exhaust pipe can be discharged after being filtered and catalyzed by the ceramic carrier 4, and simultaneously, as the first electromagnetic valve 6 is opened, the internal and external air pressures of the three-way catalyst are balanced, so that the air bag 11 is squashed under the rebound action of the supporting spring 9, and the tail gas in the air bag 11 is discharged from the first conduit 121 at the front end of the ceramic carrier 4, thereby ensuring that the tail gas can be purified by the ceramic carrier;

meanwhile, in the initial tail gas entering stage, as high-temperature tail gas continuously enters from the front end of the shell 1, the heat conducting block 24 is heated and continuously transfers heat to the interior of the corrugated pipe 21, so that liquid in the interior of the corrugated pipe 21 is evaporated, the air pressure in the interior of the corrugated pipe 21 is increased, and the corrugated pipe 21 expands and extends towards the right side, so that not only is a large amount of clean water in the water storage cavity 14 enter the interior of the corrugated pipe 21 from the water inlet pipe 25, but also the movable plate 22 moves towards the right side, and air in the piston cavity 18 on the right side of the movable plate 22 is extruded into the gas channel in the interior of the shell 1 from the second conduit 28, so that when the first electromagnetic valve 6 is closed in the initial stage, oxygen can be supplemented into the three-way catalytic converter, the substances needing oxidation reaction in the interior of the three-way catalytic converter are ensured to completely react, and the tail gas purification treatment performance is further improved;

when the temperature sensor 5 detects that the internal temperature of the three-way catalytic converter is too high, the temperature sensor 5 transmits an electric signal to enable the electromagnet 20 to be electrified to generate magnetism, the iron movable plate 22 is attracted to move towards one side of the fixed plate 19, the clear water in the corrugated pipe 21 is extruded to enter the transition cavity 15 from the water outlet pipe 26, the hydrophobic block is wetted, when the high-speed tail gas flow in the gas channel in the shell 1 flows through the outlet at one end of the capillary 17, as can be known from Bernoulli's principle, the higher the flow velocity of the fluid is, the smaller the gas pressure is, the gas pressure difference between two ends of the capillary 17 can enable the capillary 17 to suck the water in the transition cavity 15, the water entering the gas channel in the shell 1 through the capillary 17 can be dispersed into finer particles, the dispersion degree in the gas channel in the shell 1 is higher, the heat can be further and rapidly absorbed, the effect of rapid temperature reduction is achieved, when the internal temperature is reduced, when temperature sensor 5 detects the temperature reduction again, can control electro-magnet 20 and lose the electricity, bellows 21 is heated the inflation once more and absorbs water to when this three way catalyst converter high temperature once more, carry out the water spray cooling.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a three way catalyst converter for car, includes casing (1), the inside fixedly connected with heat insulating board (2) of casing (1), the one end fixedly connected with and casing (1) inner wall fixed connection's of heat insulating board (2) backup pad (3), the inside fixed mounting of heat insulating board (2) has ceramic carrier (4), its characterized in that: the temperature sensor (5) is fixedly mounted at the bottom of the inner wall of one end of the heat insulation plate (2), a first electromagnetic valve (6) is fixedly connected to the middle of one end of the support plate (3), four sets of backflow pipes (7) which are arranged in a uniform circumference manner are fixedly connected to the outer side of the middle of one end of the support plate (3), a second electromagnetic valve (71) is arranged at one end, close to the support plate (3), of the backflow pipe (7), an annular cavity (8) which is arranged inside the shell (1) is arranged on the outer side of one end of the support plate (3), eight sets of supporting springs (9) which are arranged in a uniform circumference manner are fixedly connected to the middle of the inner wall of the annular cavity (8), an arc support plate (10) is fixedly connected to the other end of each supporting spring (9), an air bag (11) is fixedly connected to one end, facing the support plate (3), and bases (12) which are fixedly connected to the heat insulation plate (2) are fixedly connected to both ends of the air bag (11), one side of the interior of the heat insulation plate (2) close to the ceramic carrier (4) is provided with a plurality of groups of first guide pipes (121) which are arranged at equal intervals, and the other ends of the first guide pipes (121) are communicated with the bottom of the base (12) on one side far away from the support plate (3).

2. The three-way catalyst for an automobile according to claim 1, characterized in that: the water storage device is characterized in that a partition plate (13) is fixedly mounted at one end inside the shell (1), a water storage cavity (14) is formed between the outer side of the partition plate (13) and the shell (1), clear water is filled inside the water storage cavity (14), a transition cavity (15) is formed between the inner side of the partition plate (13) and the heat insulation plate (2), a hydrophobic block (16) fixedly mounted on the heat insulation plate (2) is arranged on the inner side of the transition cavity (15), a plurality of capillaries (17) are arranged side by side in the fixed mounting manner on the inner side of the hydrophobic block (16), piston cavities (18) which are arranged in four groups of equal circumferences inside the shell (1) are arranged on one side of the partition plate (13), a fixing plate (19) fixedly connected with the partition plate (13) is fixedly mounted at one end of each piston cavity (18), an electromagnet (20) is fixedly mounted inside the fixing plate (19), and the electromagnets (20) are electrically connected with the temperature sensor (5), one end of the fixed plate (19) is fixedly connected with a corrugated pipe (21), the other end of the corrugated pipe (21) is fixedly connected with a movable plate (22) which is movably sleeved with the piston cavity (18), the movable plate (22) is made of iron material, one end of the movable plate (22) is fixedly connected with a return spring (23) the other end of which is fixedly connected with the fixed plate (19), one end of the corrugated pipe (21) close to the fixed plate (19) is provided with a heat conducting ring, one side of the heat conduction ring close to the heat insulation plate (2) is fixedly connected with a heat conduction block (24), one end of the heat conduction block (24) penetrates through the heat insulation plate (2), and is flush with the inner wall of the heat insulation plate (2), one side of the middle part of the fixed plate (19) is provided with a water inlet pipe (25) which penetrates through the partition plate (13) and is communicated with the water storage cavity (14), and a water outlet pipe (26) which penetrates through the partition plate (13) and is communicated with the transition cavity (15) is arranged on the other side of the middle part of the fixing plate (19).

3. The three-way catalyst for an automobile according to claim 2, characterized in that: capillary (17) are close to the one end of hydrophobic block (16) and are provided with thermal-insulated picture peg, and during capillary (17) tip inserted the picture peg, the inside of outlet pipe (26) is provided with the check valve, the inside check valve opening of outlet pipe (26) is inside towards transition chamber (15).

4. The three-way catalyst for an automobile according to claim 2, characterized in that: the outside of piston chamber (18) other end is provided with and installs intake pipe (27) at casing (1) middle part, the inboard of piston chamber (18) other end is provided with second pipe (28) of seting up in heat insulating board (2) inner wall, the other end and the inside gas passage of casing (1) of second pipe (28) are linked together, the inside of intake pipe (27) is provided with the opening and faces the inside check valve of piston chamber (18), the one end of second pipe (28) is provided with the opening and faces the check valve of the inside gas passage of casing (1).

5. The three-way catalyst for an automobile according to claim 1, characterized in that: the temperature sensor (5) is respectively electrically connected with the first electromagnetic valve (6) and the second electromagnetic valve (71), the air bag (11) is made of flame-retardant rubber with better flexibility, and the curvature of the arc support plate (10) is the same as the excircle curvature of the heat insulation plate (2).