CN216767523U - Catalytic converter - Google Patents

Abstract

The utility model provides a catalytic converter, which relates to the technical field of aftertreatment of an internal combustion engine and comprises a shell and a carrier, wherein the shell is provided with an air passage, and the two ends of the air passage are respectively provided with an air inlet and an air outlet; the carrier is arranged in the air passage and comprises a plurality of annular bodies, the lengths of the annular bodies are increased from inside to outside, and a through flow passage is defined between the adjacent annular bodies. The carrier in the catalytic converter is composed of a plurality of annular bodies, the lengths of the annular bodies increase from inside to outside, and a through flow channel is defined between the adjacent annular bodies. Therefore, the distribution of heat and air flow on the end face of the carrier can be improved, the heat transfer is uniform, the catalytic conversion efficiency is improved, the function of the catalytic converter can be realized under the condition of using less carriers, and the cost is reduced.

Description

Catalytic converter

Technical Field

The utility model relates to the technical field of aftertreatment of internal combustion engines, in particular to a catalyst.

Background

The catalyst assembly carries out oxidation-reduction reaction on three exhaust gas harmful substances including CO, HC and NO discharged by the internal combustion engine_xInto harmless water, carbon dioxide and nitrogen. With the increasingly strict requirements on environmental protection and the increasingly strict requirements on emission regulation limits, the catalyst assembly is particularly important for emission control in the light-off stage. The cost of the current catalytic converter is higher.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a catalytic converter, which is low in cost.

In order to solve the technical problems, the utility model adopts the following technical scheme:

according to one aspect of the present invention, there is provided a catalyst comprising:

a housing provided with an air passage; the two ends of the air passage are respectively provided with an air inlet and an air outlet;

a carrier disposed within the airway; the carrier comprises a plurality of annular bodies, the length of each annular body increases from inside to outside, and a through flow channel is defined between every two adjacent annular bodies.

In some embodiments, the annular bodies of the carrier are coaxially arranged.

In some embodiments, the annular body has a regular polygon shape.

In some embodiments, the flow channels are triangular.

In some embodiments, between adjacent annular bodies, an edge of the annular body located on the inner side is fixedly connected with a side face of the annular body located on the outer side.

In some embodiments, the catalyst further comprises a heating portion in thermally conductive connection with the carrier.

In some embodiments, the heating portion is thermally conductive connected to an end of an innermost annular body of the carrier, the end being close to the air inlet.

In some embodiments, the heating portion includes a heat conducting base thermally connected to an end of an innermost annular body of the carrier near the air inlet, and a heating wire thermally connected to the heat conducting base.

In some embodiments, the heating portion further includes a heat conductor fixed on one side of the heat conducting base and thermally connected to the heat conducting base, and the heat conductor is thermally connected to an end of an innermost annular body of the carrier, the end being close to the air inlet.

In some embodiments, the heating portion further includes a temperature sensor embedded in the heat conducting seat.

In some embodiments, the catalyst includes a heat conducting plate disposed at the air inlet and thermally conductively coupled to the carrier, the heat conducting plate having a through hole communicating with the air passage.

In some embodiments, the end of each annular body on the same side is flush with and abuts against the heat-conducting fin.

In some embodiments, there are a plurality of through holes, and the area of the through holes increases from the direction away from the center of the heat-conducting sheet.

In some embodiments, there are a plurality of the through holes, and the plurality of the through holes are arranged in a concentric annular array around the center of the heat-conducting fin.

In some embodiments, the flow channels between the adjacent annular bodies are arranged at intervals around the central axis of the carrier, and the flow channels are correspondingly communicated with the through holes.

In some embodiments, the areas of the through holes on the same ring are equal, and the areas of the through holes between different rings increase from inside to outside.

In some embodiments, the plurality of through holes are arranged in an array of four annular concentric rings around the axis of the heat conducting fin, the four rings are configured into a first ring to a fourth ring from inside to outside, the number of the through holes in the second ring is twenty-four, and the number of the through holes in each of the other rings is thirty.

In some embodiments, the thermally conductive sheet has a diameter of 100 mm;

the through holes in the first ring shape to the fourth ring shape are respectively corresponding to a first through hole to a fourth through hole, wherein the aperture of the first through hole is 3.073mm, the aperture of the second through hole is 4.097mm, the aperture of the third through hole is 5.121mm, and the aperture of the fourth through hole is 6.146 mm.

In some embodiments, the end portions of the annular bodies located on the same side are flush and are disposed close to the air inlet.

In some embodiments, the annular bodies are coated with a catalyst layer on the surface.

In some embodiments, the catalyst further comprises a ceramic substrate disposed at the gas outlet of the gas channel.

In some embodiments, the catalyst further comprises an annular sleeve sleeved on the outer surface of the ceramic carrier and closely matched with the inner surface of the shell.

In some embodiments, one end of the ceramic carrier is embedded in an outermost annular body, and an end of the outermost annular body abuts against the annular sleeve.

According to the technical scheme, the utility model has at least the following advantages and positive effects:

the catalyst provided by the utility model has the advantages that the carrier in the catalyst is composed of a plurality of annular bodies, the lengths of the annular bodies are increased from inside to outside, and a through flow channel is defined between the adjacent annular bodies. Therefore, the distribution of heat and air flow on the end face of the carrier can be improved, the heat transfer is uniform, the catalytic conversion efficiency is improved, the function of the catalytic converter can be realized under the condition of using fewer carriers, and the cost is reduced.

Drawings

FIG. 1 is a front view of an embodiment of a catalyst provided by the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a top view of an embodiment of a catalyst provided by the present invention;

FIG. 4 is a perspective view of a carrier in an embodiment of a catalyst provided by the present invention;

FIG. 5 is a top view of a heat transfer seat in an embodiment of a catalyst provided in accordance with the present invention;

FIG. 6 is a side view of a heated portion of an embodiment of a catalyst provided by the present invention;

FIG. 7 is a perspective view of a thermal conductor in an embodiment of a catalyst provided by the present invention;

FIG. 8 is a top view of a thermally conductive sheet in an embodiment of a catalyst provided in the present invention;

FIG. 9 is a graph of heat uniformity for a conventional catalyst;

FIG. 10 is a graph of heat uniformity for a catalyst of the present invention.

The reference numerals are explained below:

1. a housing;

2. a carrier; 20. an annular body; 200. a flow channel;

3. a heating section;

30. a heat conducting base; 300. mounting holes; 301. blind holes;

31. heating the wire;

32. a heat conductor;

33. a heat conductive sheet; 330. a central bore; 331. a first through hole; 332. a second through hole; 333. a third through hole; 334. a fourth via hole;

4. a ceramic carrier; 5. an annular sleeve; 6. a temperature sensor; 7. and (5) fixing the binding tape.

Detailed Description

Exemplary embodiments that embody features and advantages of the utility model are described in detail below in the specification. It is to be understood that the utility model is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the utility model and the description and drawings are to be regarded as illustrative in nature and not as restrictive.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present application and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular orientation, and thus are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 to 3, the present application provides a catalytic converter, which includes a housing 1, a carrier 2, and a heating portion 3, wherein the housing 1 is provided with an air passage, and two ends of the air passage are respectively an air inlet and an air outlet. The carrier 2 is fixed in the air passage and extends along the axial direction of the air passage. The carrier 2 is a concentric ring structure formed by a plurality of annular bodies 20, the length of the plurality of annular bodies 20 increases from inside to outside, and a through flow passage is defined between the adjacent annular bodies 20. The heating unit 3 is connected to the carrier 2 by heat conduction.

In this embodiment, the housing 1 is cylindrical, the hollow space inside the housing forms an air passage, and the openings at the two ends of the housing 1, which are communicated with the hollow space, are an air inlet and an air outlet, respectively. SUS436, namely ferritic stainless steel, was selected as the material of the housing 1, and the height thereof was 144 mm. Of course, other stainless steel materials or other metal materials can be used as the material of the housing 1.

The air passage is cylindrical, and the carrier 2 is fixedly arranged in the air passage and extends along the axial direction of the air passage. The carrier 2 is formed by a plurality of annular bodies 20. It will be appreciated that a plurality of annular bodies 20 form a concentric ring structure. The carrier 2 is fitted into the gas duct, each ring 20 is coaxial with the housing 1, and the length of the plurality of rings 20 increases from the inside to the outside, that is, the length of each ring 20 extending in the axial direction is arranged in a stepwise length distribution from the ring 20 located at the most intermediate position toward the ring 20 located at the outermost position. Referring to the cross-sectional view of the catalyst of fig. 2, the carrier 2 is in the form of a tower.

The adjacent annular bodies 20 define a flow passage therethrough, that is, the space between the adjacent annular bodies 20 forms a flow passage through which the gas flows. When the ring bodies 20 are circular, the space between adjacent ring bodies 20 forms a circular flow channel, and the ring bodies 20 may be equally spaced or non-equally spaced.

The heating unit 3 is connected to the carrier 2 by heat conduction. Before the fuel engine is started, the heating part 3 transfers heat to the carrier 2 through heat conduction, the lengths of the annular bodies 20 in the carrier 2 are increased from inside to outside, the distribution of heat and airflow on the end face of the carrier 2 can be improved, the heat transfer is uniform, the temperature is enabled to reach the ignition temperature of the ignition catalyst, and the catalytic conversion efficiency is improved. After the engine is started, the heat of the combustion exhaust gas enters the carrier 2, and the exhaust gas flow is uniformly distributed without interference.

In some embodiments, the flow passages between adjacent annular bodies 20 are spaced around the central axis of the carrier 2. That is, the space between the adjacent annular bodies 20 is divided into a plurality of subspaces arranged at intervals around the central axis of the carrier 2, and each of the subspaces constitutes a flow channel. A plurality of flow channels between adjacent annular bodies 20 are evenly spaced around the central axis of the carrier 2. After the engine is started, the heat of the combustion exhaust gas enters the carrier 2, and the exhaust gas flow uniformly passes through each flow passage without interference.

Referring to fig. 3 and 4, the ring body 20 has a regular polygonal cross-section. The carrier 2 is in the form of a concentric ring structure of nineteen regular polygonal annular bodies 20. The side wall of the annular body 20 in the shape of a regular polygon is formed by connecting a plurality of rectangular sides, so that the heat dissipation area is increased, and the heat conduction efficiency of the carrier 2 is improved.

Referring to fig. 4 in conjunction with fig. 3, when the space between the adjacent annular bodies 20 is divided into a plurality of subspaces spaced around the central axis of the carrier 2, and each subspace forms a flow channel 200, the flow channel 200 is triangular. The triangular flow channels 200 between the adjacent annular bodies 20 are uniformly arranged around the central axis of the carrier 2 at intervals, so that the structure of the carrier 2 is more stable, the boundaries of the triangular flow channels 200 are clear, and exhaust air flows uniformly pass through the flow channels, and interference is avoided.

Between the adjacent annular bodies 20, the edge of the annular body 20 located at the inner side is fixedly connected with the side face of the annular body 20 located at the outer side, so that the structure of the carrier 2 is more stable, and after the fixing, a structure in which a plurality of triangular flow channels 200 are uniformly arranged at intervals around the central axis of the carrier 2 can be formed between the adjacent annular bodies 20.

The material of the ring bodies 20 is SUS436, and between adjacent ring bodies 20, the edge of the ring body 20 located at the inner side is welded to the side of the ring body 20 located at the outer side, so that the nineteen regular polygonal ring bodies 20 can be welded to form the carrier 2 of the concentric ring structure. Of course, other stainless steel materials or other metal materials may be used for the annular body 20.

The surface of each annular body 20 is coated with a catalyst layer. One of noble metals such as platinum, rhodium, palladium, etc. is used as the catalyst, and is sprayed on the surface of the ring body 20 to form the catalyst layer. Before the fuel engine is started, the heating part 3 heats the carrier 2, and after the fuel engine is started, the catalytic conversion function of waste gas is directly carried out, so that the emission problem in the cold start ignition stage is solved.

Referring to fig. 2 in conjunction with fig. 4, the end portions of the annular bodies 20 on the same side are flush and disposed adjacent to the air inlet. When the height of the casing 1 is 144mm, the length (height) of the ring 20 located at the most intermediate position is 5mm, and the length (height) of the ring 20 located at the outermost layer is 95 mm. The length (height) of the annular bodies 20 from the inner layer to the outer layer is gradually increased, and the height difference between the adjacent annular bodies 20 is equal. Therefore, the integral structure of the catalyst is more compact.

In some embodiments, referring to fig. 2, the catalytic converter further includes a ceramic carrier 4, and the ceramic carrier 4 is disposed in the housing 1 and disposed at the gas outlet of the gas passage to further promote the catalytic conversion of the exhaust gas. The ceramic carrier 4 is made of cordierite and has a height of 30 mm.

The surface of the ceramic carrier 4 is coated with precious metal layers such as platinum, rhodium, palladium and the like, and one of the precious metal layers is sprayed on the surface of the ceramic carrier 4, so that the precious metal layer is formed, and the catalytic conversion of the waste gas is further improved.

When the shell 1 is cylindrical, the ceramic carrier 4 is designed to be in a round cake shape, the inner diameter of the shell 1 is equivalent to the outer diameter of the ceramic carrier 4, and the ceramic carrier 4 is embedded into the air outlet of the shell 1 and is in interference fit with the inner surface of the shell 1. The carrier 2, which is arranged in the air passage of the shell 1, is positioned right above the ceramic carrier 4, and the end parts of the annular bodies 20, which are positioned on the same side, are flush and are arranged close to the air inlet. The length of the plurality of annular bodies 20 increases from inside to outside, and as shown in fig. 2, the carrier 2 is shaped like a tower from the gas inlet toward the gas outlet.

In still other embodiments, referring to fig. 2, the catalyst further comprises an annular sleeve 5, and the annular sleeve 5 is sleeved on the outer surface of the ceramic carrier 4. The annular sleeve 5 is made of ceramic fibers, and is 3.5mm in thickness and 25mm in height. The ceramic carrier 4 and the annular sleeve 5 are embedded into the shell 1 together from the air outlet to seal the air outlet. The outer surface of the annular sleeve 5 is in close fit with the inner surface of the housing 1, the annular sleeve 5 supporting the ceramic carrier 4. In addition, one end of the ceramic carrier 4 is embedded into the outermost ring body 20, and the end of the outermost ring body 20 is abutted against the annular sleeve 5, so that the stability of the whole structure is ensured.

In some embodiments, referring to fig. 1, the heating portion 3 is thermally connected to an end of the innermost annular body 20 of the carrier 2 near the gas inlet. The heat is diffused and conducted outwards from the central inner layer of the carrier 2, and the heat transfer is more uniform.

The heating portion 3 includes a heat conduction seat 30 and a heating wire 31. Referring to fig. 5, the heat conducting base 30 is shaped like a flat cylinder, and a mounting hole 300 is formed through the center thereof. One end of the heating wire 31 is fitted into the mounting hole 300 so that the heating wire 31 is fixed to the heat conductive holder 30.

SUS436 is selected as the material of the heat conduction seat 30, and is formed by stamping. Of course, the material of the heat conducting base 30 may be other stainless steel materials or other metal materials. The radius of the heat conducting seat 30 is 30mm, the height is 20mm, and the radius of the mounting hole 300 is 10 mm. The radius of the heating wire 31 is 10mm, the outer layer material is rubber, and the thickness is about 1 mm; the inside is copper wire, and the radius is 9 mm. The radius of the heating wire 31 corresponds to the radius of the mounting hole 300 so that one end of the heating wire 31 is fitted into the mounting hole 300.

The heat conducting base 30 is embedded into the end of the innermost annular body 20 of the carrier 2 close to the air inlet, and the heating wire 31 is located outside the casing 1.

In still other embodiments, referring to fig. 7 in combination with fig. 2, the heating portion 3 further includes a heat conductor 32 fixed on one side of the heat conductive base 30 and thermally connected to the heat conductive base 30. The heat conductor 32 is in the shape of a circular plate, is made of SUS436 with a radius of 38.541mm and a thickness of 3mm, and is a solid machined part. Of course, the material of the heat conductor 32 may be other stainless steel materials or other metal materials.

The heat conductor 32 is fixed on the side of the heat conducting base 30 facing away from the heating wire 31 by welding, and the center line of the heat conductor 32 and the center line of the heat conducting base 30 are in the same straight line. The heat conductor 32 is connected in a heat-conducting manner to an end of the innermost annular body 20 of the carrier 2 close to the air inlet, for example, the heat conductor 32 may be optionally embedded in the innermost annular body 20, and the heat conductor 32 is coaxial with the carrier 2 and has a surface fitting the inner surface of the innermost annular body 20.

In still other embodiments, referring to fig. 8 in combination with fig. 2, the heating portion 3 further includes a heat conductive sheet 33, and the heat conductive sheet 33 is in a shape of a circular plate, and is made of SUS436 with a radius of 100 mm. The heat conductor 32 is fixed at the center of the heat conductive sheet 33 and is thermally conductively connected to the heat conductive sheet 33. Of course, the material of the heat conducting sheet 33 may be other stainless steel materials or other metal materials.

A center hole 330 is formed through the center of the heat-conducting plate 33, and the diameter of the center hole 330 is equal to the diameter of the heat-conducting base 30. The heat conductor 32 is fixed on the side of the heat conducting base 30 facing away from the heating wire 31 by welding, and the center line of the heat conductor 32 and the center line of the heat conducting base 30 are in the same straight line. The heat conducting seat 30 is inserted into the central hole 330, and the outer peripheral surface of the heat conducting seat 30 is tightly attached to the inner peripheral surface of the central hole 330. The heat conductor 32 abuts against the heat conductive sheet 33, so that the heat conductive base 30, the heat conductor 32 and the heat conductive sheet 33 are stably connected, and the heat conductive base 30 and the heat conductor 32 can transmit heat to the heat conductive sheet 33.

The heat conducting fin 33 is arranged at the air inlet of the air passage, the heat conducting body 32 is embedded in the innermost annular body 20, and the heat conducting body 32 is coaxial with the carrier 2 and is attached to the inner surface of the innermost annular body 20. The heat-conducting plate 33 is provided with a through hole communicating with the air passage, as shown in fig. 3.

Referring to fig. 2, the end portions of the annular bodies 20 on the same side are flush with and abut the heat conducting fins 33, so that the heat conducting fins 33 can uniformly transfer heat to the annular bodies 20.

The through holes are provided in plural, and the area of the through holes increases from the direction away from the center of the heat-conducting fin, thereby facilitating the entry of exhaust gas.

The plurality of through holes are arranged in a concentric annular array around the axis of the heat-conducting fin 33 so that the exhaust gas can uniformly flow into the air passage through the through holes.

The runners between the adjacent annular bodies 20 are arranged at intervals around the central axis of the carrier 2, and the runners are correspondingly communicated with the through holes, so that waste gas enters the runners corresponding to the through holes through the through holes, and the air flow interference is avoided.

The areas of the through holes on the same ring are equal, and the areas of the through holes between different rings are increased from inside to outside, so that the waste gas is facilitated to enter.

The plurality of through holes are arranged in an array of four annular concentric rings around the axis of the heat conducting fin 33, the four rings are configured into first to fourth rings from inside to outside, wherein the number of the through holes in the second ring is twenty-four, and the number of the through holes in each of the other rings is thirty.

The through holes in the first ring, the second ring and the fourth ring are respectively corresponding to a first through hole, a fourth through hole, a third through hole and a fourth through hole, wherein the aperture of the first through hole 331 is 3.073mm, and an included angle between every two adjacent first through holes 331 is 12-04.1; the aperture of each second through hole 332 is 4.097mm, and the included angle between every two adjacent second through holes 332 is 15-04.2; the aperture of each third through hole 333 is 5.121mm, and the included angle between every two adjacent third through holes 333 is 12-04.3; the diameter of the fourth through hole 334 is 6.146mm, and the included angle between every two adjacent fourth through holes 334 is 12-04.4.

Of course, the heat conducting sheet 33 may not be connected to the heat conductor 32, but the heat conducting sheet 33 is disposed at the air inlet, and the heat conducting sheet 33 is heated by other heating elements or other heating methods, and the heat conducting sheet 33 directly conducts the heat to the carrier 2. The structure of the heat conducting sheet 33 with through holes communicating with the air passages can adopt the above structure, and the through hole structure can be designed into other adaptive structures.

Referring to fig. 3 in conjunction with fig. 5, the heating portion 3 further includes a temperature sensor 6 embedded in the heat conductive base 30 to facilitate temperature monitoring. One side of the heat conducting seat 30 is provided with a blind hole 301, the end part of the temperature sensor 6 is embedded into the blind hole 301, and the data line part of the temperature sensor 6 and the heating wire 31 are positioned on the same side of the heat conducting seat 30. In addition, the data line portion of the temperature sensor 6 and the heating wire 31 may be bound by a fixing band 7, as shown in fig. 6.

When assembling the catalyst, the heating wire 31 and the temperature sensor 6 are arranged in the heat conducting seat 30, and the data wire part of the temperature sensor 6 and the heating wire 31 are bound by the fixing bandage 7. The heat conductive base 30, the heating wire 31, and the heat conductor 32 are joined together by resistance welding. The heat conductive base 30 is inserted into the central hole 330 of the heat conductive sheet 33, and the heat conductor 32 abuts against the heat conductive sheet 33. Then, the heat conductive sheet 33 is welded to the flat end of the carrier 2, thereby completing the assembly.

The sub-assembly is arranged in the shell 1, the carrier 2 is extruded into an air passage of the shell 1 from the air inlet, and the carrier 2 is in interference fit with the shell 1. The heat conducting fin 33 is fixed on the air inlet of the air passage and seals the air inlet.

The ceramic carrier 4 and the annular sleeve 5 are embedded into the shell 1 together from the gas outlet so as to seal the gas outlet. The outer surface of the annular sleeve 5 is a close fit with the inner surface of the housing 1.

Before the engine is started, the electric heating working mode of the catalyst is as follows:

heat conduction route: the heating wire 31 is energized to generate heat, which is transferred to the heat conductive base 30, to the heat conductor 32 and the heat conductive sheet 33 by heat conduction, and then the heat conductive sheet 33 transfers the heat to the carrier 2.

Heat radiation route: the heat reaches the heat conducting seat 30 and the heat conductor 32 and then radiates to heat the heat conducting fin 33 and the carrier 2, and the structure can guide the flow, so that the heat in the whole air passage is more uniform.

The heating wire 31 converts electric energy into heat energy, and transfers the heat energy to the heat conductive base 30 and the heat conductor 32 by heat conduction. The energy of the electric heating transfers heat to the peripheral heat-conducting fins 33, the heat-conducting fins 33 and the carrier 2 through the intermediate heat-conducting body 32. The carrier 2 consists of nineteen annular bodies 20 with increasing length, which can solve the problems of high intermediate temperature and low edge temperature, thereby ensuring uniform heat in the intermediate space.

After the fuel engine is started, the heat of the combustion exhaust gas enters the carrier 2 through the heat-conducting fins 33, and the exhaust gas flow is uniformly distributed without interference.

The catalyst manufactured according to the size can save the installation space by about 2.8L, is more practical in increasingly compact arrangement space, and has better arrangement environment applicability.

The utility model provides a catalyst, wherein a carrier 2 in the catalyst is in a concentric ring structure formed by a plurality of annular bodies 20, the length of each annular body 20 increases from inside to outside, and a through flow channel is defined between the adjacent annular bodies 20. Therefore, the distribution of heat and air flow on the end face of the carrier 2 can be improved, the heat is transferred uniformly, the temperature is promoted to reach the ignition temperature of the ignition catalyst, and the catalytic conversion efficiency is improved.

Fig. 9 is a heat uniformity chart of a conventional catalyst, fig. 10 is a heat uniformity chart of the catalyst of the present invention, and it can be found by comparison that the Uniformity (UI) of the air flow 10mm below the front end surface of the catalyst of the present invention can be improved by 0.05, thereby improving the distribution of the air flow on the end surface of the carrier and improving the catalytic conversion efficiency.

Through experimental research, the catalyst provided by the utility model can reduce the volume by 20 percent on the basis of the same volume of ceramic carrier, and can save the cost by about 600 and 800 yuan.

Compared with the traditional ceramic, the catalyst provided by the utility model has obviously better emission performance and is heated for 45sCan reduce NMHC 30%, HC 30%, CO 55% and NO_X 33％。

The above embodiments are merely exemplary structures, and the structures in the embodiments are not combined structures of fixed collocation, and the structures in multiple embodiments can be combined and used arbitrarily without structure conflict. Such as: the catalytic converter only comprises a shell 1 and a carrier 2, wherein the shell 1 is provided with an air passage, and the two ends of the air passage are respectively provided with an air inlet and an air outlet. The carrier 2 is disposed in the airway. The carrier 2 comprises a plurality of annular bodies 20, the length of each annular body 20 increases from inside to outside, and a through flow passage is formed between every two adjacent annular bodies 20. So, when waste gas passes through the runner, this catalyst converter improves the distribution of heat and air current on the carrier terminal surface, and heat transfer is even, has promoted catalytic conversion efficiency, can use to realize the catalyst converter function under the carrier condition still less, reduce cost.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (23)

1. A catalyst, comprising:

a housing provided with an air passage; the two ends of the air passage are respectively provided with an air inlet and an air outlet;

a carrier disposed within the airway; the carrier comprises a plurality of annular bodies, the length of each annular body increases from inside to outside, and a through flow channel is formed between every two adjacent annular bodies.

2. A catalyst according to claim 1, wherein the annular bodies of the carrier are arranged coaxially.

3. The catalyst of claim 2, wherein the annular body is in the shape of a regular polygon.

4. A catalyst according to claim 3, wherein the flow channels are triangular.

5. The catalytic converter of claim 4, wherein between adjacent annular bodies, the edge of the annular body at the inner side is fixedly connected with the side surface of the annular body at the outer side.

6. The catalytic converter of claim 1, further comprising a heating portion in thermally conductive connection with the carrier.

7. The catalytic converter of claim 6 wherein the heating portion is in thermally conductive communication with an end of an innermost annular body of the substrate proximate the inlet port.

8. The catalytic converter of claim 7, wherein the heating portion includes a heat conducting base thermally connected to an end of an innermost annular body of the carrier body near the air inlet, and a heating wire thermally connected to the heat conducting base.

9. The catalytic converter of claim 8, wherein the heating portion further comprises a heat conductor fixed to a side of the heat conducting base and thermally coupled to the heat conducting base, the heat conductor being thermally coupled to an end of an innermost annular body of the carrier body adjacent to the air inlet.

10. The catalyst according to claim 8, wherein the heating portion further includes a temperature sensor embedded in the heat conduction seat.

11. The catalytic converter of claim 1, further comprising a heat transfer fin disposed at the air inlet and in thermally conductive communication with the carrier, the heat transfer fin being provided with a through hole communicating with the air passage.

12. The catalytic converter of claim 11, wherein the end of each annular body on the same side is flush and abuts the thermally conductive sheet.

13. The catalyst according to claim 11, wherein the through-hole is plural, and an area of the through-hole increases from a direction away from a center of the thermally conductive sheet.

14. The catalyst of claim 11 wherein the through-holes are arranged in a concentric annular array around the center of the thermally conductive sheet.

15. The catalytic converter of claim 14 wherein the flow passages between adjacent annular bodies are spaced around the central axis of the carrier, the flow passages communicating with the plurality of through holes.

16. The catalytic converter of claim 14, wherein the areas of the through holes on the same ring are equal, and the areas of the through holes between different rings increase from inside to outside.

17. The catalyst according to claim 14, wherein the plurality of through holes are arranged in a concentric ring array of four rings around the axis of the heat-conducting plate, the four rings being arranged from the inside to the outside in first to fourth rings, wherein the number of through holes in the second ring is twenty-four, and the number of through holes in each of the remaining rings is thirty.

18. The catalyst according to claim 17, wherein the thermally conductive sheet has a diameter of 100 mm;

the through holes in the first ring shape to the fourth ring shape are respectively corresponding to a first through hole to a fourth through hole, wherein the aperture of the first through hole is 3.073mm, the aperture of the second through hole is 4.097mm, the aperture of the third through hole is 5.121mm, and the aperture of the fourth through hole is 6.146 mm.

19. The catalyst of claim 1, wherein the ends of each annular body on the same side are flush and disposed adjacent to the inlet port.

20. The catalytic converter of claim 1, wherein a surface of the annular body is coated with a catalyst layer.

21. The catalyst of claim 1, further comprising a ceramic support disposed at an air outlet of the air channel.

22. The catalytic converter of claim 21, further comprising an annular sleeve disposed over the outer surface of the ceramic carrier and in close fit with the inner surface of the housing.

23. The catalyst of claim 22 wherein one end of the ceramic support is embedded within an outermost annular body, the end of the outermost annular body abutting the annular sleeve.

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