Fuel oil catalysis system

Abstract

The utility model discloses a fuel oil catalysis system, which relates to the technical field of environmental protection and comprises a porous structure. The porous structure is used for being filled in a main pipeline of the injection rail and is provided with a rare earth oxide coating attached to the inner wall of the porous structure. And the side surface of the porous structure comprises a partial cylindrical surface and a flow guide surface which is concave relative to an imaginary cylinder corresponding to the partial cylindrical surface. The flow guide face is used for directly facing a nozzle of the injection rail so that a flow guide cavity for fuel oil to flow can be formed between the flow guide face and the nozzle. The porous structure is arranged in the main pipeline of the injection rail, so that the internal space of the injection rail can be fully utilized, the occupied space of an engine cavity is reduced, and power can be provided for fuel oil to pass through the porous structure by utilizing higher temperature, pressure and flow speed in the injection rail; and a relatively high temperature environment is provided for catalysis of the rare earth oxide coating.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of environmental protection, in particular to a fuel catalytic system. BACKGROUND

[0002] In the prior art, the catalytic layer is generally attached to a cylindrical porous structure, and the porous structure fills the exhaust pipe to realize catalytic treatment of the tail gas to meet environmental protection requirements. However, due to the limited installation space of the engine cavity, it is difficult to achieve good catalytic treatment effect. Patent No. CN 116677523 A discloses a fuel catalytic device, which uses a rare earth catalytic module to catalyze the fuel before combustion, but still relies on an independent shell, which is not suitable for installation in a space-limited engine cavity. SUMMARY

[0003] The utility model aims to provide a fuel catalytic system to reduce space occupation and improve the space utilization rate in the engine cavity.

[0004] To achieve the above-mentioned purpose, the utility model provides the following scheme:

[0005] The utility model discloses a fuel catalytic system, which comprises:

[0006] The porous structure is used to fill in the main pipeline of the spray rail and has a rare earth oxide coating attached to the inner wall thereof. The side surface of the porous structure comprises a partial cylindrical surface and a guide surface recessed in the imaginary cylinder corresponding to the partial cylindrical surface. The guide surface is used to face the nozzle of the spray rail to form a guide cavity for fuel flow between the guide surface and the nozzle.

[0007] Preferably, the fuel catalytic system further comprises a retaining frame for connecting the spray rail; the retaining frame connects the porous structure and positions the porous structure circumferentially to make the guide surface face the guide cavity.

[0008] Preferably, the retaining frame comprises a main frame body and a connecting part connected to the main frame body; the main frame body is sleeved outside the porous structure and is consistent with the cross-sectional shape of the porous structure; and the connecting part is used to connect the column of the spray rail.

[0009] Preferably, the connecting part has a sleeve ring through which the column of the spray rail passes.

[0010] Preferably, the porous structure comprises a carrier one; the downstream end of the carrier one is a recessed surface to make the recessed center of the carrier one deviate from the column of the spray rail and the recessed edge of the carrier one abut the column of the spray rail.

[0011] Preferably, the upstream end of the carrier one is internally concave; the porous structure further comprises a carrier two; the downstream end of the carrier two is externally convex, so that the externally convex center of the carrier two is capable of abutting against the internally concave center of the upstream end of the carrier one, and the externally convex edge of the carrier two is capable of deviating from the internally concave edge of the upstream end of the carrier one.

[0012] Preferably, the upstream end of the carrier two is internally concave, so that:

[0013] the internally concave center of the upstream end of the carrier two is capable of abutting against the externally convex center of the downstream end of another carrier two, and the internally concave edge of the carrier two is capable of deviating from the externally convex edge of the downstream end of the another carrier two;

[0014] and the internally concave center of the upstream end of the carrier two is capable of deviating from the column of the spray rail, and the internally concave edge of the carrier two is capable of abutting against the column of the spray rail.

[0015] Preferably, the fuel catalytic system further comprises a spiral sheet, the spiral sheet has a rare earth oxide coating attached to the surface of the spiral sheet; the spiral sheet is arranged in a flexible pipe upstream of the spray rail or a metal pipe upstream of the spray rail.

[0016] Preferably, the fuel catalytic system further comprises a positioning column, the outer side of the positioning column is provided with a plurality of spiral sheets, and the positioning column is fixedly connected with the plurality of spiral sheets.

[0017] Preferably, the fuel catalytic system further comprises a flexible pipe, a metal pipe, a pump body, a connecting pipe and a spray rail connected in sequence along the fuel flow direction.

[0018] The utility model discloses relative to relevant technology has obtained following technical effect:

[0019] The porous structure of the utility model discloses not the cylindrical structure of usual use, but has the flow guide surface that internally concave relative to the imaginary cylinder where part cylindrical surface is. Therefore, when filling in the fuel pipeline of the form of the round pipe usually, the flow guide cavity is formed between the flow guide surface and the inner wall of the fuel pipeline. The fuel flows in from one end of the porous structure, and after the catalytic treatment of the rare earth oxide coating, the fuel flows out from the other end of the porous structure, and then can flow into the flow guide cavity.

[0020] The porous structure of the utility model is used for installing in the main pipeline of the spray rail, and the flow guide surface is used for facing the nozzle of the spray rail. Therefore, the fuel after the catalytic treatment can flow to the nozzle through the flow guide cavity, and then enter the cylinder of the engine.

[0021] The above structural features of the porous structure make it not only can provide larger surface area by using the porous structure itself to attach the rare earth oxide coating for the catalytic treatment of the fuel, but also can provide the flow guide cavity to transport the fuel after the catalytic treatment to the nozzle, adapt to the flow path characteristics of the fuel at the spray rail.

[0022] Therefore, the porous structure is suitable to be installed in the main pipeline of the spray rail, which not only can fully utilize the internal space of the spray rail and reduce the space occupation of the engine cavity, but also can utilize the high temperature, pressure and flow rate inside the spray rail to provide power for the fuel passing through the porous structure and provide a high temperature environment for the catalysis of the rare earth oxide coating. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0024] Figure 1 FIG. 1 is a schematic diagram of a fuel catalysis system in some embodiments of the present application;

[0025] Figure 2 FIG. 2 is a schematic diagram of a carrier with a rare earth oxide coating in some embodiments of the present application from a certain perspective;

[0026] Figure 3 FIG. 3 is a schematic diagram of the carrier with the rare earth oxide coating in some embodiments of the present application from another perspective;

[0027] Figure 4 FIG. 4 is a schematic diagram of another carrier with the rare earth oxide coating in some embodiments of the present application from a certain perspective;

[0028] Figure 5 FIG. 5 is a schematic diagram of the retainer in some embodiments of the present application from a certain perspective;

[0029] Figure 6 FIG. 6 is a schematic diagram of the retainer in some embodiments of the present application from another perspective;

[0030] Figure 7 FIG. 7 is a partial enlarged view of part A in FIG. 1; Figure 1

[0031] FIG. 8 is a structure schematic diagram of three spiral pieces in the flexible tube in part B in FIG. 1; Figure 8 Figure 1 FIG. 9 is a combination structure schematic diagram of the three spiral pieces and the positioning column in the metal tube in part B in FIG. 1;

[0032] Figure 9 Figure 1 FIG. 10 is a sectional view of the local part of the metal tube in part B in FIG. 1.

[0033] Figure 10 Figure 1

[0034] ​​​​In the figure: 100 - fuel catalytic system; 1 - porous structure; 11 - part of a cylindrical surface; 12 - flow guide surface; 13 - outer convex surface; 14 - inner concave surface; 15 - carrier 1; 16 - carrier 2; 17 - transition surface; 2 - retainer; 21 - main frame body; 22 - connecting part; 23 - collar; 3 - helical blade; 31 - positioning column; 4 - rare earth oxide coating; 5 - flexible pipe; 6 - metal pipe; 7 - pump body; 8 - connecting pipe; 9 - spray rail; 91 - main pipe; 92 - stand; 93 - nozzle. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0036] The purpose of the present application is to provide a fuel catalytic system to reduce space occupation and improve the space utilization rate in the engine cavity.

[0037] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be described in further detail below with reference to the drawings and specific embodiments.

[0038] The upstream end and the downstream end of a certain component referred to in the present embodiment refer to the two axial ends thereof. The upstream end is the end through which fuel passes first, and the downstream end is the end opposite to the upstream end, i.e. the end through which fuel passes last.

[0039] Referring to Figures 1-10 The present embodiment provides a fuel catalytic system 100, which comprises a porous structure 1. The porous structure 1 is used to fill in the main pipe 91 of the spray rail 9 and has a rare earth oxide coating 4 attached to the inner wall thereof. The side surface of the porous structure 1 comprises a part of a cylindrical surface 11 and a flow guide surface 12 corresponding to the imaginary inner concave cylindrical surface of the part of the cylindrical surface 11. The flow guide surface 12 is used to face the nozzle 93 of the spray rail 9 to form a flow guide cavity for fuel flow between the flow guide surface 12 and the nozzle 93.

[0040] The working principle of the fuel catalytic system 100 of the present embodiment is as follows:

[0041] The porous structure 1 is not a common cylindrical structure, but has a flow guiding surface 12 which is concave with respect to an imaginary cylinder in which the partial cylindrical surface 11 is located. Therefore, when the porous structure 1 is filled in a fuel pipe which is usually in the form of a circular pipe, a flow guiding cavity is formed between the flow guiding surface 12 and the inner wall of the fuel pipe. Fuel flows into the porous structure 1 from one end, is catalytically treated by the rare earth oxide coating 4, and then flows out of the other end of the porous structure 1, and then can flow into the flow guiding cavity.

[0042] For a fuel vehicle, a fuel rail 9 is usually arranged at the fuel inlet of the engine of the vehicle, and the fuel rail 9 includes a main pipe 91, a column 92 and a nozzle 93. The column 92 vertically penetrates the main pipe 91 and is used to fix the main pipe 91 to reduce the influence of the vibration of the engine on the main pipe 91. A plurality of nozzles 93 are distributed on the side of the main pipe 91 close to the engine to spray fuel into a plurality of cylinders of the engine.

[0043] The porous structure 1 of the embodiment is used to be installed in the main pipe 91 of the fuel rail 9, and the flow guiding surface 12 thereof is used to face the nozzle 93 of the fuel rail 9. Therefore, the fuel treated by catalysis can flow into the nozzle 93 through the flow guiding cavity, and then enter the cylinder of the engine. After installation, the porous structure 1 can be coaxial with the main pipe 91 of the fuel rail 9, or parallel to each other.

[0044] The above structural features of the porous structure 1 make it not only able to provide a larger surface area by using its own porous structure to adhere the rare earth oxide coating 4 used for catalytic treatment of fuel, but also able to provide a flow guiding cavity to transport the treated fuel into the nozzle 93, adapting to the flow path characteristics of the fuel at the fuel rail 9.

[0045] Therefore, the porous structure 1 is suitable to be installed in the main pipe 91 of the fuel rail 9, not only can make full use of the internal space of the fuel rail 9 to reduce the space occupation of the engine cavity, but also can use the higher temperature, pressure and flow rate inside the fuel rail 9 to provide power for the fuel to pass through the porous structure 1, and provide a higher temperature environment for the catalysis of the rare earth oxide coating 4.

[0046] Similar to the existing porous structure 1, the porous structure 1 of the embodiment has the inlet of the internal channel located at one axial end of the porous structure 1, and the outlet of the internal channel located at the other axial end of the porous structure 1. The fuel flows into the porous structure 1 from one axial end, and flows out of the other axial end. That is, the inlet and outlet of the internal channel should not be arranged on the side of the porous structure 1, so as to facilitate the fuel to enter the porous structure 1.

[0047] The internal channel of the porous structure 1 can be parallel to the axis of the porous structure 1 to reduce the production difficulty. The internal channel of the porous structure 1 can also have a wave or spiral shape.

[0048] The rare earth oxide coating 4 of the embodiment is not particularly limited, and any rare earth oxide coating 4 for catalyzing fuel known to those skilled in the art can be used.

[0049] For example, the central angle of the flow guide surface 12 is not less than 85° and not more than 125°.

[0050] For example, the flow guide surface 12 is a flat surface and is smoothly connected to the partial cylindrical surface 11 through the transition surface 17. It can be understood that the flow guide surface 12 can also be a wavy surface, or a cylindrical surface with a radius of curvature greater than that of the partial cylindrical surface 11, or any other surface, as long as it is concave relative to the corresponding imaginary cylinder of the partial cylindrical surface 11, so that the flow guide surface 12 and the main pipe 91 can form a flow guide cavity.

[0051] As a possible example, in the embodiment, the fuel catalytic system 100 further comprises a holder 2 for connecting the spray rail 9. The holder 2 connects the porous structure 1 and circumferentially positions the porous structure 1 so that the flow guide surface 12 faces the flow guide cavity.

[0052] As a possible example, in the embodiment, the holder 2 comprises a main holder body 21 and a connecting portion 22 connected to the main holder body 21. The main holder body 21 is sleeved outside the porous structure 1 and has the same cross-sectional shape as the porous structure 1. The connecting portion 22 is used to connect the column 92 of the spray rail 9.

[0053] Since the main holder body 21 has the same cross-sectional shape as the porous structure 1, both are non-circular cross-sections, the main holder body 21 can circumferentially position the porous structure 1. By connecting the connecting portion 22 of the main holder body 21 to the column 92 of the spray rail 9, the main holder body 21 is positioned by the column 92, and the porous structure 1 is circumferentially positioned, so that the flow guide surface 12 of the porous structure 1 always faces the nozzle 93 of the spray rail 9, and the circumferential position of the porous structure 1 remains stable.

[0054] There are various combinations of the main holder body 21 and the connecting portion 22.

[0055] For example, two main holder bodies 21 are connected to the two ends of the connecting portion 22, and the middle part of the connecting portion 22 is used to connect the column 92 of the spray rail 9.

[0056] For example, the connecting portion 22 is connected to the main holder body 21 at only one end (upstream end or downstream end).

[0057] For example, the main holder body 21 is a structure formed by winding a metal wire or a non-metal wire, and the end of the main holder body 21 is integrally connected to the end of the connecting portion 22. This structure makes the main holder body 21 have a certain axial flexibility (i.e., axial elasticity) to adapt to various column 92 spacings, and allows fuel to pass through the main holder body 21 into the flow guide cavity.

[0058] As a possible example, in the embodiment, the connecting portion 22 has a sleeve 23 through which the column 92 of the spray rail 9 passes.

[0059] It should be noted that the retainer 2 and the porous structure 1 are both located inside the main pipe 91 of the spray rail 9, and it is difficult to extend the arm into it, so the conventional fixing method using fasteners lacks the corresponding operation space and is not practical.

[0060] The sleeve structure adopted by the embodiment can avoid damaging the structure of the column 92 and ensure the structural strength of the column 92. On the other hand, the column 92 is installed while passing through the sleeve 23, and the column 92 is disassembled while being separated from the sleeve 23, so that the positioning of the retainer 2 is realized through the assembly and disassembly of the column 92, without the need for additional assembly and disassembly operations, which is simple and convenient.

[0061] The sleeve structure can not only limit the circumferential torsion of the retainer 2, but also limit the axial movement of the retainer 2, thereby achieving the axial and circumferential positioning of the retainer 2.

[0062] There are various axial positioning methods for the porous structure 1.

[0063] Example 1: The retainer 2 can have an abutting portion, and the axial positioning of the porous structure 1 is realized by abutting the downstream end of the porous structure 1 with the abutting portion.

[0064] Example 2: The downstream end of the porous structure 1 can be pushed against the column 92 of the spray rail 9 or the upstream end of another porous structure 1 by the thrust of the fuel, thereby achieving the axial positioning of the porous structure 1.

[0065] For example 2, since the downstream end of the porous structure 1 is the oil outlet position, when it is also used as the abutting position, the influence on the oil outlet needs to be considered. Therefore, the structure design of the abutting position of the porous structure 1 and the column 92 and the structure design of the abutting position of the adjacent two porous structures 1 need to be considered.

[0066] For the structure design of the abutting position of the porous structure 1 and the column 92:

[0067] As a possible example, in the embodiment, the porous structure 1 includes a carrier 15. The downstream end of the carrier 15 is an inner concave surface 14, so that the inner concave center of the carrier 15 can deviate from the column 92 of the spray rail 9, and the inner concave edge of the carrier 15 can abut against the column 92 of the spray rail 9.

[0068] The downstream end of the carrier 15 is set as the inner concave surface 14 in the embodiment, and the purpose is to avoid the column 92 blocking the outlet of the hole at the downstream end of the porous structure 1, so that the oil can flow out smoothly.

[0069] When the inner concave surface 14 is a cylindrical surface completely abutting the post 92, it will still block the outlet of the hole. This embodiment excludes the technical solution of the inner concave surface 14 completely abutting the post 92 by limiting the center of the inner concave surface 14 to deviate from (i.e., not contact) the post 92 and the edge to abut the post 92, so that the downstream end of the carrier 15 can stably discharge oil.

[0070] For the structure design of the abutting position of the two adjacent porous structures 1:

[0071] As a possible example, in this embodiment, the upstream end of the carrier 15 is an inner concave surface 14. The porous structure 1 further includes a carrier 16. The downstream end of the carrier 16 is an outer convex surface 13, so that the outer convex center of the carrier 16 can abut the inner concave center of the upstream end of the carrier 15, and the outer convex edge of the carrier 16 can deviate from the inner concave edge of the upstream end of the carrier 15.

[0072] This structure design of the abutting position of the carrier 16 and the carrier 15 makes the fuel flowing out of the downstream end of the carrier 16, when the carrier 16 abuts the carrier 15, part of which flows into the upstream end of the carrier 15, continues to be transported backward and is catalyzed by the rare earth oxide coating 4, and part of which flows into the flow guide cavity to supply fuel to the nozzle 93 to meet the oil demand of the engine. Since the upstream end of the porous structure 1 has a hole inlet, the abutting position will not block the fuel.

[0073] As a possible example, in this embodiment, the upstream end of the carrier 16 is an inner concave surface 14, so that:

[0074] The inner concave center of the carrier 16 can abut the outer convex center of the downstream end of another carrier 16, and the inner concave edge of the carrier 16 can deviate from the outer convex edge of the downstream end of another carrier 16.

[0075] This structure design of the abutting position of the carrier 16 and another carrier 16 is equivalent to the structure design of the abutting position of the carrier 16 and the carrier 15, and both have the same effect, which will not be described here.

[0076] In addition, the inner concave center of the upstream end of the carrier 16 can deviate from the post 92 of the spray rail 9, and the inner concave edge can abut the post 92 of the spray rail 9. That is, the structure design of the abutting position of the upstream end of the carrier 16 and the post 92 is equivalent to the structure design of the abutting position of the downstream end of the carrier 15 and the post 92, and both have the same effect, which will not be described here.

[0077] As a possible example, in this embodiment, the fuel catalytic system 100 further includes a spiral sheet 3 having a rare earth oxide coating 4 attached to the surface thereof. The spiral sheet 3 is arranged in the flexible pipe 5 upstream of the spray rail 9 or in the metal pipe 6 upstream of the spray rail 9.

[0078] The fuel spirally flows under the influence of the helical fin 3, thereby prolonging the flow path and prolonging the contact time of the fuel with the rare earth oxide coating 4, and improving the catalytic treatment effect of the fuel.

[0079] The installation forms of the helical fin 3 differ according to the pipeline in which the helical fin 3 is located.

[0080] For the flexible pipe 5:

[0081] A single helical fin 3 or multiple helical fins 3 capable of relative movement can be arranged inside the flexible pipe 5 to adapt to the bending deformation requirement of the flexible pipe 5 through the bending deformation and relative movement of the helical fin 3.

[0082] For the metal pipe 6:

[0083] As a possible example, in the embodiment, the fuel catalytic system 100 further comprises a positioning column 31, the outer side of the positioning column 31 is provided with multiple helical fins 3, and the positioning column 31 is fixedly connected with the multiple helical fins 3, and the fixed connection mode includes but is not limited to welding.

[0084] The positioning column 31 is used to limit the relative position of the two adjacent helical fins 3, form a flow guide structure with stable structure, and is suitable for being installed in the metal pipe 6 with stable shape.

[0085] For example, the positioning column 31 is arranged at both ends of the multiple helical fins 3 to limit the relative position of the two connected helical fins 3 from both ends, respectively.

[0086] As a possible example, in the embodiment, the fuel catalytic system 100 further comprises a flexible pipe 5, a metal pipe 6, a pump body 7, a connecting pipe 8 and a spray rail 9 connected in sequence along the fuel flow direction.

[0087] The single helical fin 3 or the multiple helical fins 3 not positioned with each other are installed in the flexible pipe 5, the whole structure composed of the multiple helical fins 3 and the positioning column 31 is installed in the metal pipe 6, and the retainer 2 and the porous structure 1 are installed in the main pipeline 91 of the spray rail 9.

[0088] Under the pumping of the pump body 7, the fuel flows out of the fuel tank, passes through the flexible pipe 5, the metal pipe 6, the pump body 7, the connecting pipe 8 and the spray rail 9 in sequence, and reaches the engine. In the above flow process, the fuel is catalytically treated by contacting the rare earth oxide coating 4 attached to the helical fin 3 and the porous structure 1, respectively.

[0089] For example, the joint butted with the downstream end of the flexible pipe 5 is screwed into the flexible pipe 5 and can abut and limit the helical fin 3 in the flexible pipe 5 to limit the axial position of the helical fin 3.

[0090] The joint, which is exemplarily butted against the downstream end of the metal pipe 6, is screwed into the metal pipe 6 and can abut against the helical blade 3 in the metal pipe 6 to limit the axial position of the helical blade 3.

[0091] The axial positioning of the helical blade 3 is realized by the joint, and no additional positioning block is introduced, thereby simplifying the installation structure.

[0092] It can be understood that the rare earth oxide coating 4 is not limited to being attached to the inner wall of the porous structure 1 and the helical blade 3, but can also be attached to the outer surface (including the side surface and the end surface) of the porous structure, the inner wall of the metal pipe 6, the main pipeline 91, the nozzle 93, the surface of the stand column 92 extending into the main pipeline 91, the surface of the positioning column 31, and the like.

[0093] The principle and implementation mode of the present application are described by applying specific examples in the present application, and the above examples are only used to help understand the method and core idea of the present application; meanwhile, for the general technical personnel in the field, the specific implementation mode and application range will be changed according to the idea of the present application. In conclusion, the content of the present application should not be understood as the limitation of the present application.

Claims

1. A fuel catalytic system, characterized by, The application relates to a porous structure for filling in a main pipe of a fuel injection rail, which has a rare earth oxide coating attached to the inner wall of the porous structure; the side surface of the porous structure comprises a partial cylindrical surface and a flow guide surface concave to the corresponding imaginary cylinder relative to the partial cylindrical surface; the flow guide surface is arranged to face the nozzle of the fuel injection rail to form a flow guide cavity for fuel flow between the flow guide surface and the nozzle. The application also relates to a holder for connecting the fuel injection rail; the holder connects the porous structure and positions the porous structure in the circumferential direction so that the flow guide surface faces the flow guide cavity.

2. The fuel-borne catalyst system of claim 1, wherein: The holder comprises a main holder body and a connecting part connected to the main holder body; the main holder body is sleeved outside the porous structure and is consistent with the cross-sectional shape of the porous structure; 3. The fuel-borne catalyst system of claim 2, wherein: The connecting part is used for connecting the column of the fuel injection rail. The connecting part has a sleeve ring through which the column of the fuel injection rail passes.

4. The fuel-borne catalyst system of claim 3, wherein:

5. The fuel catalytic system according to claim 3, wherein: The porous structure comprises a carrier one; the downstream end of the carrier one is a concave surface so that the concave center of the carrier one can deviate from the column of the fuel injection rail and the concave edge of the carrier one can abut the column of the fuel injection rail. The upstream end of the carrier one is a concave surface; the porous structure further comprises a carrier two; the downstream end of the carrier two is a convex surface so that the convex center of the carrier two can abut the concave center of the upstream end of the carrier one and the convex edge of the carrier two can deviate from the concave edge of the upstream end of the carrier one.

6. The fuel catalytic system according to claim 5, wherein: The upstream end of the carrier two is a concave surface so that:

7. The fuel catalytic system according to claim 6, wherein: The concave center of the upstream end of the carrier two can abut the convex center of the downstream end of another carrier two and the concave edge of the upstream end of the carrier two can deviate from the convex edge of the downstream end of another carrier two; and the concave center of the upstream end of the carrier two can deviate from the column of the fuel injection rail and the concave edge of the upstream end of the carrier two can abut the column of the fuel injection rail. The application further relates to a spiral piece having a rare earth oxide coating attached to the surface of the spiral piece; the spiral piece is arranged in a flexible pipe upstream of the fuel injection rail or a metal pipe upstream of the fuel injection rail. The application further relates to a positioning column, the outer side of which is provided with a plurality of spiral pieces, and the positioning column is fixedly connected with the plurality of spiral pieces.

8. The fuel catalyst system of claim 1, wherein: The application further relates to a flexible pipe, a metal pipe, a pump body, a connecting pipe and a fuel injection rail which are sequentially connected in the fuel flow direction.

9. The fuel-borne catalyst system of claim 8, wherein: ​ 10. The fuel catalyst system according to any one of claims 1 to 9, wherein: ​

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