Catalytic converter

Abstract

The present invention provides a catalytic converter, which relates to the technical field of post-treatment of internal combustion engines. The catalytic converter includes a housing and a carrier. Among them, the housing is provided with an air passage, and the two ends of the air passage are an air inlet and an air outlet respectively; the carrier is arranged in the air passage, and the carrier includes a plurality of annular bodies, the lengths of the plurality of annular bodies increase from the inside to the outside, and a through-flow channel is defined between adjacent annular bodies. For the above-mentioned catalytic converter, the carrier inside it is composed of a plurality of annular bodies, the lengths of the plurality of annular bodies increase from the inside to the outside, and a through-flow channel is defined between adjacent annular bodies. In this way, 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 enhanced, the function of the catalytic converter can be realized with less carrier used, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of post-treatment of internal combustion engines, and particularly to a catalytic converter. Background Art

[0002] The catalytic converter assembly converts three harmful exhaust gas components, CO, HC, and NO, emitted by an internal combustion engine into harmless water, carbon dioxide, and nitrogen through an oxidation-reduction reaction. With the increasingly stringent environmental protection requirements and the continuous tightening of emission regulation limits, the catalytic converter assembly is particularly important for emission control during the light-off stage. Currently, however, the cost of catalytic converters is relatively high. x While currently the cost of catalytic converters is relatively high. Summary of the Invention

[0003] The purpose of the present invention is to provide a catalytic converter with a relatively low cost.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] According to one aspect of the present invention, there is provided a catalytic converter, comprising:

[0006] A housing provided with an air passage; two ends of the air passage are respectively an air inlet and an air outlet;

[0007] A carrier disposed within the air passage; the carrier includes a plurality of annular bodies, lengths of the plurality of annular bodies increase from inside to outside, and a through-flow channel is defined between adjacent annular bodies.

[0008] In some embodiments, the annular bodies of the carrier are coaxially arranged.

[0009] In some embodiments, the annular body is a regular polygon.

[0010] In some embodiments, the flow channel is triangular.

[0011] In some embodiments, between adjacent annular bodies, an edge of the inner annular body is fixedly connected to a side surface of the outer annular body.

[0012] In some embodiments, the catalytic converter further includes a heating portion, and the heating portion is in heat conduction connection with the carrier.

[0013] In some embodiments, the heating portion is in heat conduction connection with one end of the innermost annular body of the carrier close to the air inlet.

[0014] In some embodiments, the heating portion includes a heat conducting seat in heat conduction connection with one end of the innermost annular body of the carrier close to the air inlet, and a heating wire in heat conduction connection with the heat conducting seat.

[0015] In some embodiments, the heating part further includes a heat conductor fixed to one side of the heat conduction seat and thermally connected to the heat conduction seat, and the heat conductor is thermally connected to the end of the innermost annular body in the carrier close to the air inlet.

[0016] In some embodiments, the heating part further includes a temperature sensor embedded in the heat conduction seat.

[0017] In some embodiments, the catalytic converter includes a heat conduction plate disposed at the air inlet and thermally connected to the carrier, and the heat conduction plate is provided with through holes communicating with the air passage.

[0018] In some embodiments, the ends of the respective annular bodies on the same side are flush and abut against the heat conduction plate.

[0019] In some embodiments, there are a plurality of the through holes, and the area of the through holes increases in a direction away from the center of the heat conduction plate.

[0020] In some embodiments, there are a plurality of the through holes, and the plurality of through holes are arranged in a concentric annular array around the center of the heat conduction plate.

[0021] In some embodiments, the flow channels between adjacent annular bodies are arranged at intervals around the central axis of the carrier in a plurality, and the plurality of flow channels communicate with the plurality of through holes correspondingly.

[0022] 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 the inside to the outside.

[0023] In some embodiments, the plurality of through holes are arranged in a concentric ring array of four rings around the axis of the heat conduction plate. The four rings are configured as the first to fourth rings from the inside to the outside. Among them, 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.

[0024] In some embodiments, the diameter of the heat conduction plate is 100 mm;

[0025] The through holes in the first to fourth rings correspond to the first to fourth through holes respectively. Among them, the aperture of the first through hole is 3.073 mm, the aperture of the second through hole is 4.097 mm, the aperture of the third through hole is 5.121 mm, and the aperture of the fourth through hole is 6.146 mm.

[0026] In some embodiments, the ends of the respective annular bodies on the same side are flush and are arranged close to the air inlet.

[0027] In some embodiments, the surfaces of the annular bodies are all covered with a catalyst layer.

[0028] In some embodiments, the catalytic converter further includes a ceramic carrier disposed at the air outlet of the air passage.

[0029] In some embodiments, the catalytic converter further includes an annular sleeve sleeved on the outer surface of the ceramic carrier and closely fitted with the inner surface of the housing.

[0030] In some embodiments, one end of the ceramic carrier is embedded in the outermost annular body, and the end of the outermost annular body abuts against the annular sleeve.

[0031] From the above technical solutions, it can be seen that the present invention has at least the following advantages and positive effects:

[0032] For the catalytic converter provided by the present invention, the carrier inside it is composed of multiple annular bodies, the lengths of the multiple annular bodies increase from the inside to the outside, and a through-flow channel is defined between adjacent annular bodies. In this way, 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 enhanced, the function of the catalytic converter can be realized with less carrier used, and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is the front view of the catalytic converter embodiment provided by the present invention;

[0034] Figure 2 is Figure 1 the A-A cross-sectional view of;

[0035] Figure 3 is the top view of the catalytic converter embodiment provided by the present invention;

[0036] Figure 4 is the three-dimensional view of the carrier in the catalytic converter embodiment provided by the present invention;

[0037] Figure 5 is the top view of the heat conducting seat in the catalytic converter embodiment provided by the present invention;

[0038] Figure 6 is the side view of the heating part in the catalytic converter embodiment provided by the present invention;

[0039] Figure 7 is the three-dimensional view of the heat conducting body in the catalytic converter embodiment provided by the present invention;

[0040] Figure 8 is the top view of the heat conducting sheet in the catalytic converter embodiment provided by the present invention;

[0041] Figure 9 is the heat uniformity diagram of the traditional catalytic converter;

[0042] Figure 10 This is the heat uniformity diagram of the catalytic converter of the present invention.

[0043] The descriptions of the reference numerals are as follows:

[0044] 1. Housing;

[0045] 2. Carrier; 20. Annular body; 200. Flow channel;

[0046] 3. Heating part;

[0047] 30. Heat conducting seat; 300. Mounting hole; 301. Blind hole;

[0048] 31. Heating wire;

[0049] 32. Heat conducting body;

[0050] 33. Heat conducting sheet; 330. Central hole; 331. First through hole; 332. Second through hole; 333. Third through hole; 334. Fourth through hole;

[0051] 4. Ceramic carrier; 5. Annular sleeve; 6. Temperature sensor; 7. Fixed tie. Detailed implementation manners

[0052] Typical implementation manners reflecting the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different implementation manners, all of which do not depart from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes rather than for limiting the present invention.

[0053] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "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 otherwise specifically defined.

[0054] Refer to Figures 1 to 3As shown in the figure, the present application provides a catalytic converter, which includes a housing 1, a carrier 2, and a heating part 3. Among them, the housing 1 is provided with an air passage, and the two ends of the air passage are respectively an air inlet and an air outlet. The carrier 2 is fixedly installed in the air passage and extends along the axial direction of the air passage. The carrier 2 has a concentric ring structure composed of a plurality of annular bodies 20. The lengths of the plurality of annular bodies 20 increase from inside to outside. Moreover, a through-flow channel is defined between adjacent annular bodies 20. The heating part 3 is thermally conductively connected to the carrier 2.

[0055] In this embodiment, the housing 1 is in a cylindrical shape, and the hollow space inside it constitutes the air passage. The openings at both ends of the housing 1 communicating with the hollow space are respectively the air inlet and the air outlet. The material of the housing 1 is selected as SUS436, that is, ferritic stainless steel, and its height is 144 mm. Of course, the material of the housing 1 can also be selected as other stainless steel materials or other metal materials.

[0056] The air passage is in a cylindrical shape. The carrier 2 is fixedly installed in the air passage and extends along the axial direction of the air passage. The carrier 2 is composed of a plurality of annular bodies 20. It can be understood that the carrier 2 has a concentric ring structure composed of a plurality of annular bodies 20. The carrier 2 is installed in the air passage. Each annular body 20 is coaxial with the housing 1. The lengths of the plurality of annular bodies 20 increase from inside to outside. That is to say, from the annular body 20 at the most middle part to the outermost annular body 20, the lengths of each annular body 20 extending along the axial direction are arranged in a stepped length distribution. Refer to Figure 2 the cross-sectional view of the catalytic converter shown, the carrier 2 presents a tower shape.

[0057] A through-flow channel is defined between adjacent annular bodies 20. That is to say, the spaced space between adjacent annular bodies 20 constitutes a flow channel for gas flow. When the annular body 20 is in a circular ring shape, the spaced space between adjacent annular bodies 20 constitutes a circular ring-shaped flow channel. The spaces between the annular bodies 20 can be equally spaced or non-equally spaced.

[0058] The heating part 3 is thermally conductively connected to the carrier 2. Before the fuel engine starts, the heating part 3 transfers heat to the carrier 2 through heat conduction. The lengths of the plurality of annular bodies 20 in the carrier 2 increase from inside to outside, which can improve the distribution of heat and air flow on the end face of the carrier 2. The heat transfer is uniform, which promotes the temperature to reach the ignition temperature of the catalyst and improves the catalytic conversion efficiency. After the engine starts, the heat of the combustion exhaust gas enters the carrier 2, and the exhaust gas flow is evenly distributed without interference.

[0059] In some embodiments, the flow channels between adjacent annular bodies 20 are arranged at intervals around the central axis of the carrier 2. That is to say, the space between adjacent annular bodies 20 is divided into multiple sub-spaces arranged at intervals around the central axis of the carrier 2, and each sub-space constitutes a flow channel. The multiple 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 evenly passes through each flow channel without interference.

[0060] Referring to Figure 3 and Figure 4 As shown, the cross-section of the annular body 20 is a regular polygon. The carrier 2 has a concentric ring structure composed of nineteen regular polygon annular bodies 20. For the annular body 20 with a regular polygon cross-section, the side walls are connected by multiple rectangular sides, thereby increasing the heat dissipation area and helping to improve the heat conduction efficiency of the carrier 2.

[0061] Referring again to Figure 4 and in combination with Figure 3 As shown, when the space between adjacent annular bodies 20 is divided into multiple sub-spaces arranged at intervals around the central axis of the carrier 2, and each sub-space constitutes a flow channel 200, the flow channel 200 is triangular. The multiple triangular flow channels 200 between adjacent annular bodies 20 are evenly spaced around the central axis of the carrier 2, which can make the structure of the carrier 2 more stable. Moreover, the boundaries of the triangular flow channels 200 are distinct, and the exhaust gas flow evenly passes through each flow channel without interference.

[0062] Between adjacent annular bodies 20, the edge of the inner annular body 20 is fixedly connected to the side surface of the outer annular body 20. In this way, the structure of the carrier 2 can be made more stable. After being fixed, a structure with multiple triangular flow channels 200 evenly spaced around the central axis of the carrier 2 can be formed between adjacent annular bodies 20.

[0063] The material of the annular body 20 is selected as SUS436. Between adjacent annular bodies 20, the edge of the inner annular body 20 is welded to the side surface of the outer annular body 20. After the nineteen regular polygon annular bodies 20 are welded, the carrier 2 with a concentric ring structure can be formed. Of course, the material of the annular body 20 can also be selected from other stainless steel materials or other metal materials.

[0064] A catalyst layer is provided on the surface of each annular body 20. The catalyst uses precious metals such as platinum, rhodium, and palladium. Spraying one of them on the surface of the annular body 20 forms the catalyst layer. Before the fuel engine is started, the heating part 3 heats the carrier 2. After the fuel engine is started, the exhaust gas catalytic conversion function is directly carried out to solve the emission problem during the cold start ignition stage.

[0065] Referring to Figure 2 and in combination withFigure 4 As shown, the ends of each annular body 20 on the same side are flush and are arranged close to the air inlet. When the height of the housing 1 is 144 mm, the length (height) of the annular body 20 at the most central part is 5 mm, and the length (height) of the annular body 20 at the outermost layer is 95 mm. Starting from the inner layer to the outer layer, the length (height) of the annular body 20 gradually increases, and the height difference between adjacent annular bodies 20 is equal. It can be seen that the overall structure of the catalytic converter is more compact.

[0066] In some embodiments, referring to Figure 2 As shown, the catalytic converter further includes a ceramic carrier 4, which is placed in the housing 1 and is arranged at the air outlet of the air passage to further improve the catalytic conversion of the exhaust gas. The material of the ceramic carrier 4 is cordierite, with a height of 30 mm.

[0067] The surface of the ceramic carrier 4 is coated with a noble metal layer such as platinum, rhodium, and palladium. Spraying one of them on the surface of the ceramic carrier 4 forms the noble metal layer, which further improves the catalytic conversion of the exhaust gas.

[0068] When the housing 1 is in a cylindrical shape, the ceramic carrier 4 is designed as a round cake shape. The inner diameter of the housing 1 is equivalent to the outer diameter of the ceramic carrier 4. The ceramic carrier 4 is embedded into the air outlet of the housing 1 and is in interference fit with the inner surface of the housing 1. The carrier 2 installed in the air passage of the housing 1 is located directly above the ceramic carrier 4, and the ends of each annular body 20 on the same side are flush and are arranged close to the air inlet. The lengths of the multiple annular bodies 20 increase from the inside to the outside. Referring to Figure 2 As shown, the carrier 2 is in a tower shape from the air inlet towards the air outlet.

[0069] In still other embodiments, referring to Figure 2 As shown, the catalytic converter further includes an annular sleeve 5, which is sleeved on the outer surface of the ceramic carrier 4. The material of the annular sleeve 5 is ceramic fiber, with a thickness of 3.5 mm and a height of 25 mm. The ceramic carrier 4 together with the annular sleeve 5 is installed into the housing 1 from the air outlet to block the air outlet. The outer surface of the annular sleeve 5 is in close fit with the inner surface of the housing 1, and the annular sleeve 5 plays a role in supporting the ceramic carrier 4. In addition, one end of the ceramic carrier 4 is embedded into the outermost annular body 20, and the end of the outermost annular body 20 abuts against the annular sleeve 5, ensuring the stability of the overall structure.

[0070] In some embodiments, referring to Figure 1 As shown, the heating part 3 is thermally conductive connected to one end of the innermost annular body 20 of the carrier 2 close to the air inlet. The heat diffuses and conducts from the central inner layer of the carrier 2 to the outside, and the heat transfer is more uniform.

[0071] The heating part 3 includes a heat conducting seat 30 and a heating wire 31. Among them, referring to Figure 5The heat-conducting seat 30 is in a flat cylindrical shape, and a mounting hole 300 is provided at the center thereof. One end of the heating wire 31 is embedded in the mounting hole 300 so that the heating wire 31 is fixed to the heat-conducting seat 30 .

[0072] The material of the heat-conducting seat 30 is SUS436, which is formed by stamping. Of course, the material of the heat-conducting seat 30 can also 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 10mm. The radius of the heating wire 31 is 10mm, the outer layer material is rubber, the thickness is about 1mm; the inner layer is a copper wire with a radius of 9mm. The radius of the heating wire 31 is equivalent to the radius of the mounting hole 300, so that one end of the heating wire 31 can be embedded in the mounting hole 300.

[0073] The heat conducting seat 30 is embedded in the innermost annular body 20 of the carrier 2 at one end close to the air inlet, and the heating wire 31 is located outside the shell 1 .

[0074] In some other embodiments, see Figure 7 Combined with Figure 2 As shown, the heating part 3 also includes a heat conductor 32 fixed to one side of the heat-conducting seat 30 and connected to the heat-conducting seat 30 by thermal conduction. The heat conductor 32 is in the shape of a disc, made of SUS436, with a radius of 38.541 mm, a thickness of 3 mm, and is a solid machined part. Of course, the material of the heat conductor 32 can also be other stainless steel materials or other metal materials.

[0075] The heat conductor 32 is fixed to the side of the heat-conducting seat 30 facing away from the heating wire 31 by welding, and the center line of the heat conductor 32 is in the same straight line as the center line of the heat-conducting seat 30. The heat conductor 32 is connected to the end of the innermost ring body 20 in the carrier 2 close to the air inlet by thermal conduction. For example, the heat conductor 32 can be embedded in the innermost ring body 20, and the heat conductor 32 is coaxial with the carrier 2 and the surface is in contact with the inner surface of the innermost ring body 20.

[0076] In some other embodiments, see Figure 8 Combined with Figure 2 As shown, the heating part 3 also includes a heat conducting sheet 33, which is in the shape of a disc, made of SUS436, and has a radius of 100 mm. The heat conductor 32 is fixed at the center of the heat conducting sheet 33 and is thermally connected to the heat conducting sheet 33. Of course, the material of the heat conducting sheet 33 can also be selected from other stainless steel materials or other metal materials.

[0077] A central hole 330 runs through the center of the heat-conducting fin 33, and the aperture of the central hole 330 is comparable to the diameter of the heat-conducting base 30. The heat-conducting body 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-conducting body 32 is the same straight line as the center line of the heat-conducting base 30. The heat-conducting base 30 is inserted into the central hole 330, and the outer peripheral surface of the heat-conducting base 30 is tightly fitted with the inner peripheral surface of the central hole 330. The heat-conducting body 32 abuts against the heat-conducting fin 33, which on the one hand makes the heat-conducting base 30, the heat-conducting body 32 and the heat-conducting fin 33 firmly connected, and on the other hand facilitates the heat-conducting base 30 and the heat-conducting body 32 to transfer heat to the heat-conducting fin 33.

[0078] 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, the heat-conducting body 32 is coaxial with the carrier 2 and the surface thereof is fitted with the inner surface of the innermost annular body 20. The heat-conducting fin 33 is provided with through holes communicating with the air passage, see Figure 3 as shown.

[0079] See Figure 2 as shown, the ends of the respective annular bodies 20 on the same side are flush and abut against the heat-conducting fin 33, so as to facilitate the heat-conducting fin 33 to uniformly transfer heat to the respective annular bodies 20.

[0080] There are a plurality of through holes, and the area of the through holes increases in the direction away from the center of the heat-conducting fin, which helps the exhaust gas to enter.

[0081] The plurality of through holes are arranged in a concentric annular array around the axis of the heat-conducting fin 33, so as to facilitate the exhaust gas to uniformly flow into the air passage through the through holes.

[0082] The flow channels between adjacent annular bodies 20 are arranged at intervals around the central axis of the carrier 2, and the plurality of flow channels communicate with the plurality of through holes correspondingly, so that the exhaust gas enters the flow channels corresponding to the through holes through the through holes, avoiding air flow interference.

[0083] The areas of the respective through holes on the same ring are equal, and the areas of the through holes between different rings increase from the inside to the outside, which helps the exhaust gas to enter.

[0084] The plurality of through holes are arranged in a concentric ring array of four rings around the axis of the heat-conducting fin 33. The four rings are configured as the first to fourth rings from the inside to the outside. Among them, the number of through holes in the second ring is twenty-four, and the number of through holes in the remaining rings is thirty.

[0085] The through holes in the first to fourth rings respectively correspond to the first to fourth through holes. Among them, the aperture of the first through hole 331 is 3.073 mm, and the included angle between adjacent first through holes 331 is 12° - 04.1; the aperture of the second through hole 332 is 4.097 mm, and the included angle between adjacent second through holes 332 is 15° - 04.2; the aperture of the third through hole 333 is 5.121 mm, and the included angle between adjacent third through holes 333 is 12° - 04.3; the aperture of the fourth through hole 334 is 6.146 mm, and the included angle between adjacent fourth through holes 334 is 12° - 04.4.

[0086] Of course, the heat conducting fin 33 may not be connected to the heat conducting body 32. Instead, the heat conducting fin 33 is arranged at the air inlet, and the heat conducting fin 33 is heated by other heating elements or other heating methods, and the heat conducting fin 33 directly conducts heat to the carrier 2. The structure in which the heat conducting fin 33 is provided with through holes communicating with the air passage can adopt the above structure and can be connected. The through hole structure can also be designed into other adapted structures.

[0087] Refer to Figure 3 and in combination with Figure 5 as shown, the heating part 3 further includes a temperature sensor 6 embedded in the heat conducting seat 30 for temperature monitoring. A blind hole 301 is formed on one side of the heat conducting seat 30, the end 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 located on the same side of the heat conducting seat 30. In addition, the data line part of the temperature sensor 6 and the heating wire 31 can be tied by a fixing tie 7, see Figure 6 as shown.

[0088] When assembling the catalytic converter, the heating wire 31 and the temperature sensor 6 are placed in the heat conducting seat 30, and the data line part of the temperature sensor 6 and the heating wire 31 are tied by a fixing tie 7. The heat conducting seat 30, the heating wire 31, and the heat conducting body 32 are combined together by resistance welding. The heat conducting seat 30 is embedded into the central hole 330 of the heat conducting fin 33, and the heat conducting body 32 abuts against the heat conducting fin 33. Then, the end of the heat conducting fin 33 flush with the carrier 2 is welded, thus completing the assembly of the subassembly.

[0089] The above subassembly is installed into the housing 1. The carrier 2 is extruded into the air passage of the housing 1 from the air inlet, and the carrier 2 is in interference fit with the housing 1. The heat conducting fin 33 is fixed at the air inlet of the air passage and seals the air inlet.

[0090] The ceramic carrier 4 and the annular sleeve 5 are jointly installed into the housing 1 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.

[0091] Before the engine starts, the electric heating working mode of the catalytic converter:

[0092] Heat conduction route: The heating wire 31 is energized to generate heat, which is transferred to the heat conduction seat 30 and then conducted to the heat conductor 32 and the heat conduction sheet 33 through heat conduction. Then, the heat conduction sheet 33 transfers the heat to the carrier 2.

[0093] Heat radiation route: After the heat reaches the heat conduction seat 30 and the heat conductor 32, it radiates to heat the heat conduction sheet 33 and the carrier 2. This structure can conduct the flow, making the heat in the entire air duct more uniform.

[0094] The heating wire 31 converts electrical energy into heat energy and transfers the heat to the heat conduction seat 30 and the heat conductor 32 through heat conduction. The energy of electric heating transfers heat to the surrounding heat conduction sheets 33 and from the heat conduction sheet 33 to the carrier 2 through the intermediate heat conductor 32. The carrier 2 is composed of nineteen annular bodies 20 with increasing lengths, which can solve the problem of high temperature in the middle and low temperature at the edge, thus making the heat in the middle space uniform.

[0095] After the fuel engine starts, the heat of the combustion exhaust gas enters the carrier 2 through the heat conduction sheet 33, and the exhaust gas flow is evenly distributed without interference.

[0096] The catalytic converter manufactured according to the above dimensions can save about 2.8L of installation space, is more practical in the increasingly compact layout space, and has better adaptability to the layout environment.

[0097] In the catalytic converter provided by the present invention, the carrier 2 inside it has a concentric ring structure composed of a plurality of annular bodies 20. The lengths of the plurality of annular bodies 20 increase from the inside to the outside, and a through-flow channel is defined between adjacent annular bodies 20. In this way, the distribution of heat and gas flow on the end face of the carrier 2 can be improved, the heat transfer is uniform, the temperature is promoted to reach the ignition temperature of the ignition catalyst, and the catalytic conversion efficiency is improved.

[0098] Figure 9 It is the heat uniformity diagram of the traditional catalytic converter. Figure 10 It is the heat uniformity diagram of the catalytic converter of the present invention. After comparison, it can be found that the gas flow uniformity (UI) 10 mm below the front end face of the catalytic converter of the present invention can be increased by 0.05, which can improve the distribution of gas flow on the end face of the carrier and improve the catalytic conversion efficiency.

[0099] Through experimental exploration and research, the catalytic converter provided by the present invention can reduce the volume by 20% on the basis of the same volume of ceramic carrier, and can save about 600 - 800 yuan in cost.

[0100] Compared with the traditional ceramic, the emission performance of the catalytic converter provided by the present invention is significantly improved. During the 45s heating stage, it can reduce NMHC by 30%, HC by 30%, CO by 55%, and NO X by 33%.

[0101] The above embodiments are only illustrative examples of the structure. The structures in each embodiment are not combined structures with fixed collocations. Without structural conflicts, the structures in multiple embodiments can be arbitrarily combined and used. For example, the catalytic converter only includes a housing 1 and a carrier 2. Among them, the housing 1 is provided with an air passage, and the two ends of the air passage are an air inlet and an air outlet respectively. The carrier 2 is arranged in the air passage. The carrier 2 includes a plurality of annular bodies 20, and the lengths of the plurality of annular bodies 20 increase from the inside to the outside. A through-flow channel is formed between adjacent annular bodies 20. In this way, when the exhaust gas passes through the flow channel, the catalytic converter improves the distribution of heat and air flow on the end face of the carrier, the heat transfer is uniform, the catalytic conversion efficiency is improved, the function of the catalytic converter can be realized with fewer carriers, and the cost is reduced.

[0102] Although the present invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be broadly construed within the spirit and scope defined by the appended claims. Therefore, all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A catalytic converter, characterized in that, Comprising: A housing provided with an air passage; both ends of the air passage are respectively an air inlet and an air outlet; A carrier disposed within the air passage; the carrier includes a plurality of annular bodies, the plurality of annular bodies form a concentric ring structure, the carrier is fitted into the air passage, each of the annular bodies is coaxial with the housing, the lengths of the plurality of annular bodies increase from the inside to the outside, from the innermost annular body to the outermost annular body, the lengths of each of the annular bodies extending along the axial direction are configured in a stepped length distribution, and a through-flow channel is formed between adjacent annular bodies.

2. The catalytic converter according to claim 1, wherein The annular body is a regular polygon.

3. The catalytic converter according to claim 2, characterized in that, The flow channel is triangular.

4. The catalytic converter according to claim 3, wherein, Between adjacent annular bodies, the edge of the inner annular body is fixedly connected to the side surface of the outer annular body.

5. The catalytic converter according to claim 1, characterized in that, It further includes a heating part, and the heating part is in heat conduction connection with the carrier.

6. The catalytic converter according to claim 5, wherein The heating part is in heat conduction connection with one end of the innermost annular body of the carrier close to the air inlet.

7. The catalytic converter according to claim 6, characterized in that, The heating part includes a heat conduction seat in heat conduction connection with one end of the innermost annular body of the carrier close to the air inlet, and a heating wire in heat conduction connection with the heat conduction seat.

8. The catalytic converter according to claim 7, wherein, The heating part further includes a heat conductor fixed on one side of the heat conduction seat and in heat conduction connection with the heat conduction seat, and the heat conductor is in heat conduction connection with one end of the innermost annular body of the carrier close to the air inlet.

9. The catalytic converter according to claim 7, wherein The heating part further includes a temperature sensor embedded in the heat conduction seat.

10. The catalytic converter according to claim 1, characterized in that, It further includes a heat conduction sheet disposed at the air inlet and in heat conduction connection with the carrier, and the heat conduction sheet is provided with through holes communicating with the air passage.

11. The catalytic converter according to claim 10, characterized in that, The ends of each of the annular bodies on the same side are flush and abut against the heat conduction sheet.

12. The catalytic converter according to claim 10, wherein, There are a plurality of the through holes, and the area of the through holes increases from the direction away from the center of the heat conduction sheet.

13. The catalytic converter according to claim 10, characterized in that, The through holes are arranged in a concentric ring array around the center of the heat conduction sheet.

14. The catalytic converter according to claim 13, wherein The flow channels between adjacent annular bodies are arranged at intervals around the central axis of the carrier, and the plurality of flow channels communicate with the plurality of through holes correspondingly.

15. The catalytic converter according to claim 13, characterized in that, The areas of the through holes on the same ring are equal, and the areas of the through holes between different rings increase from the inside to the outside.

16. The catalytic converter according to claim 13, wherein The plurality of through holes are arranged in a concentric ring array of four rings around the axis of the heat conduction sheet. The four rings are configured as the first to fourth rings from the inside to the outside. Among them, 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.

17. The catalytic converter according to claim 16, wherein, The diameter of the heat conduction sheet is 100 mm; The through holes in the first to fourth rings correspond to the first to fourth through holes respectively. Among them, the aperture of the first through hole is 3.073 mm, the aperture of the second through hole is 4.097 mm, the aperture of the third through hole is 5.121 mm, and the aperture of the fourth through hole is 6.146 mm.

18. The catalytic converter according to claim 1, characterized in that, The ends of each of the annular bodies on the same side are flush and are arranged close to the air inlet.

19. The catalytic converter according to claim 1, characterized in that, The surface of the annular body is covered with a catalyst layer.

20. The catalytic converter according to claim 1, characterized in that, It further includes a ceramic carrier disposed at the air outlet of the air passage.

21. The catalytic converter according to claim 20, wherein, It further includes an annular sleeve sleeved on the outer surface of the ceramic carrier and closely fitted with the inner surface of the housing.

22. The catalytic converter according to claim 21, wherein, One end of the ceramic carrier is embedded into the outermost annular body, and the end of the outermost annular body abuts against the annular sleeve.

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