A multi-stage heating honeycomb body

Abstract

This application relates to a multi-stage heated honeycomb structure, which falls under the technical field of exhaust gas treatment equipment. It includes a shell, a first positive electrode, a second positive electrode, a first negative electrode, a second negative electrode, a first layer group, and a second layer group. The first layer group is divided into two first honeycomb layers, and the second layer group is divided into two second honeycomb layers. Each first honeycomb layer has a first conductive plate, and each second honeycomb layer has a second conductive plate. The first positive electrode energizes one first honeycomb layer and one second honeycomb layer, and conducts electricity to the first negative electrode through the first and second conductive plates, respectively, forming two first current flow paths. The second positive electrode forms two pathways with the other first and second honeycomb layers and their corresponding first and second conductive plates, forming two second current flow paths. This application achieves a more uniform distribution of the first and second current flow paths on the honeycomb structure, improving the uniformity of electric heating of the honeycomb structure.

Description

Technical Field

[0001] This application relates to the field of exhaust gas treatment equipment technology, and in particular to a multi-stage heated honeycomb structure. Background Technology

[0002] Electrically heated honeycomb substrates are a technology used for exhaust gas treatment. They rapidly raise the temperature to the catalyst's activation temperature via electrical heating to improve exhaust gas purification performance after engine startup. Electrically heated honeycomb substrates can be used to purify fluids such as automotive exhaust. By allowing the fluid to flow through multiple compartments of the honeycomb structure, the catalyst converts harmful substances in the exhaust gas.

[0003] Chinese Patent CN102414409A discloses a multi-stage heating honeycomb structure. The honeycomb structure has at least one heating plate, each heating plate having at least one first layer group made of conductive material and one second layer group made of conductive material. The first and second layer groups are wound around each other and electrically insulated from one another. The first layer group forms a first current path through which current for a first heating circuit passes, while the second layer group forms a second current path through which current for a second heating circuit passes. However, the structured layers within the first and second layer groups are folded together, with a distance of two structured layers between the first layer groups along the radial direction of the honeycomb carrier. This results in an uneven distribution of current paths within the first and second layer groups, leading to poor heating uniformity of the honeycomb carrier. Summary of the Invention

[0004] To improve the problem of uneven current path distribution in the first and second layers, which leads to poor heating uniformity of the honeycomb carrier, this application provides a multi-stage heating honeycomb structure.

[0005] The multi-stage heated honeycomb structure provided in this application adopts the following technical solution: A multi-stage heated honeycomb structure includes a shell, a first positive electrode, a second positive electrode, a first negative electrode, a second negative electrode, a first layer group, and a second layer group. The first layer group and the second layer group are wound around each other in an S-shape inside the shell to form a honeycomb structure. The first layer group forms a first fold at the center of the honeycomb structure, and the second layer group forms a second fold at the center of the honeycomb structure. The first folded portion is provided with a first insulating member to divide the first layer into two electrically insulating first honeycomb layers. The second folded portion is provided with a second insulating member to divide the second layer into two electrically insulating second honeycomb layers. Each first honeycomb layer is insulatedly connected to a first conductive plate, and each second honeycomb layer is insulatedly connected to a second conductive plate. One first honeycomb layer and one second honeycomb layer are electrically connected to the first positive electrode, and one first conductive plate and one second conductive plate are electrically connected to the first negative electrode, so as to form two first current flow paths on the honeycomb body. Another first honeycomb layer and a second honeycomb layer are electrically connected to the second positive electrode, and another first conductive plate and a second conductive plate are electrically connected to the second negative electrode, so that two second current flow paths can be formed on the honeycomb body; The first current flow path and the second current flow path are arranged alternately along the longitudinal direction of the honeycomb structure.

[0006] By adopting the above technical solution, when the honeycomb structure inside the shell is electrically heated, the current acts on a first honeycomb layer and a second honeycomb layer through the first positive electrode, and then conducts through the first conductive plate and the second conductive plate to the first negative electrode, forming two first current flow paths with the same heating state. The second positive electrode forms two circuits with the other first honeycomb layer, the second honeycomb layer, and the corresponding first conductive plate and the second conductive plate, thereby forming two second current flow paths with the same heating state. The two first current flow paths and the two second current flow paths are spaced apart, so that the first current flow paths and the second current flow paths are more evenly distributed on the honeycomb structure, thereby improving the uniformity of electric heating of the honeycomb structure.

[0007] In one specific implementation, both the first honeycomb layer and the second honeycomb layer include a corrugated sheet and two support sheets. The corrugated sheet is disposed between the two support sheets, and a channel for exhaust gas to flow is formed between the corrugated sheet and the support sheets.

[0008] By adopting the above technical solution, a space for placing the catalyst is formed between the support plate and the corrugated plate. When the exhaust gas flows in the channel, it comes into contact with the catalyst to complete the catalytic treatment of the exhaust gas.

[0009] In one specific implementation, the first insulating element includes a first insulating plate with two first honeycomb layers located on both sides of the first insulating plate, and the second insulating element includes a second insulating plate with two second honeycomb layers located on both sides of the second insulating plate.

[0010] By adopting the above technical solution, the first insulating plate divides the first honeycomb layer into a first current flow path and a second current flow path, and the second insulating plate divides the second honeycomb layer into a first current flow path and a second current flow path, thereby increasing the number of current flow paths in the honeycomb body and improving the heating uniformity of the honeycomb body.

[0011] In one specific implementation, the first conductive plate is attached to the outside of the support sheet of the first honeycomb layer through an insulating layer and is wound with the first layer group; the second conductive plate is attached to the outside of the support sheet of the second honeycomb layer through an insulating layer and is wound with the second layer group.

[0012] By adopting the above technical solution, the first conductive plate is installed on the first honeycomb layer through an insulating layer, and the second conductive plate is installed on the second honeycomb layer through an insulating layer, which reduces the space occupied by the first and second conductive plates in the honeycomb body and improves the convenience of installing the first and second conductive plates.

[0013] In one specific implementation, the housing is made of insulating material, the first positive electrode includes two first positive electrode posts, the two first positive electrode posts are threaded through the housing and electrically connected to the first honeycomb layer and the second honeycomb layer respectively, and the second positive electrode includes two second positive electrode posts, the two second positive electrode posts are threaded through the housing and electrically connected to the first honeycomb layer and the second honeycomb layer respectively.

[0014] By adopting the above technical solution, the two first positive terminals and the two second positive terminals are used to supply power to the two first current flow paths and the two second current flow paths respectively, which facilitates the control of each current flow path.

[0015] In one specific implementation, both the first conductive plate and the second conductive plate have a connection end at their ends, and the housing has a connection slot that corresponds to each connection end. The connection end can be inserted into the connection slot, and the first negative electrode is electrically connected to the second negative electrode.

[0016] By adopting the above technical solution, when the rolled honeycomb body is installed into the housing, the connecting ends of the first conductive plate and the second conductive plate are respectively inserted into the corresponding connecting grooves, which helps to separate the first conductive plate and the second conductive plate from the first honeycomb layer and the second honeycomb layer, and facilitates the electrical connection between the first conductive plate and the first negative electrode, and between the second conductive plate and the second negative electrode.

[0017] In one specific implementation scheme: the first negative electrode includes two first negative terminals, the second negative electrode includes two second negative terminals, the two first negative terminals and the two second negative terminals are all disposed on the housing and are electrically connected to the corresponding connection terminals respectively.

[0018] In one specific implementation scheme, the housing has mounting holes that correspond one-to-one with and communicate with the connecting grooves. The first negative terminal and the second negative terminal are respectively threaded into the mounting holes and abut against the corresponding connecting ends.

[0019] By adopting the above technical solution, the first negative terminal and the second negative terminal are threadedly connected to the housing. The first negative terminal and the second negative terminal are inserted into the corresponding mounting holes and electrically connected to the corresponding connection, thereby improving the convenience of installing the first negative terminal and the second negative terminal.

[0020] In one specific implementation scheme, the outer wall of the housing is provided with threaded seats corresponding to the mounting holes one by one, and the first negative terminal and the second negative terminal are respectively threadedly connected to the corresponding threaded seats.

[0021] By adopting the above technical solution and setting the threaded seat, the strength of the connection between the first negative terminal and the second negative terminal housing is improved.

[0022] In one specific implementation, the thickness of the support sheets in both the first and second layer groups is 25 micrometers to 35 micrometers.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. When the honeycomb structure inside the shell is electrically heated, the current acts on a first honeycomb layer and a second honeycomb layer through the first positive electrode, and then conducts through the first conductive plate and the second conductive plate to the first negative electrode, forming two first current flow paths with the same heating state. The second positive electrode forms two circuits with another first honeycomb layer, the second honeycomb layer, and the corresponding first conductive plate and the second conductive plate, thereby forming two second current flow paths with the same heating state. The two first current flow paths and the two second current flow paths are spaced apart, so that the first current flow paths and the second current flow paths are more evenly distributed on the honeycomb structure, thereby providing uniformity of electric heating of the honeycomb structure. 2. The first negative terminal and the second negative terminal are threadedly connected to the housing. The first negative terminal and the second negative terminal are inserted into the corresponding mounting holes and electrically connected to the corresponding connection, thereby improving the convenience of installing the first negative terminal and the second negative terminal. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a multi-stage heated honeycomb structure according to an embodiment of this application.

[0025] Figure 2 This is a structural diagram used to illustrate the corrugated sheet and the support sheet.

[0026] Figure 3 yes Figure 1 Enlarged view of section A.

[0027] Explanation of reference numerals in the attached drawings: 1. Housing; 21. First positive electrode; 211. First positive electrode post; 22. Second positive electrode; 221. Second positive electrode post; 23. First negative electrode; 231. First negative electrode post; 24. Second negative electrode; 241. Second negative electrode post; 31. First layer group; 311. First honeycomb layer; 32. Second layer group; 321. Second honeycomb layer; 33. First fold; 34. Second fold; 4. Honeycomb body; 51. First insulating component; 511. First insulating plate; 52. Second insulating component; 521. Second insulating plate; 61. First conductive plate; 62. Second conductive plate; 71. First current flow path; 72. Second current flow path; 81. Corrugated sheet; 82. Support piece; 91. Connecting end; 92. Connecting groove; 93. Threaded seat; 94. Mounting hole. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0029] This application discloses a multi-stage heated honeycomb structure.

[0030] Reference Figure 1 A multi-stage heated honeycomb structure includes a shell 1, a first positive electrode 21, a second positive electrode 22, a first negative electrode 23, a second negative electrode 24, a first layer group 31, and a second layer group 32. The shell 1 is made of insulating ceramic material. The first positive electrode 21 includes two first positive electrode posts 211, and the second positive electrode 22 includes two second positive electrode posts 221. The two first positive electrode posts 211 and the two second positive electrode posts 221 are all disposed on the shell 1 along the axis of the shell 1. The first negative electrode 23 includes two first negative electrode posts 231, and the second negative electrode 24 includes two second negative electrode posts 241. The two first negative electrode posts 231 and the two second negative electrode posts 241 are all disposed on the shell 1.

[0031] The first layer group 31 and the second layer group 32 are wound together in an S-shape inside the shell 1 to form a honeycomb body 4. The first layer group 31 forms a first folded portion 33 at the center of the honeycomb body 4, and the second layer group 32 forms a second folded portion 34 at the center of the honeycomb body 4. A polymer insulating material is filled between the first layer group 31 and the second layer group 32, between the portions of the first layer group 31 on both sides of the first folded portion 33, and between the portions of the second layer group 32 on both sides of the second folded portion 34 to achieve insulation between them. A first insulating element 51 is provided on the first folded portion 33. In this embodiment, the first insulating element 51 is a first insulating plate 511 made of ceramic material, dividing the first layer group 31 into two electrically insulating first honeycomb layers 311. A second insulating element 52 is provided on the second folded portion 34. The second insulating element 52 is a second insulating plate 521 made of ceramic material, dividing the second layer group 32 into two electrically insulating second honeycomb layers 321.

[0032] The tail ends of the first honeycomb layer 311 and the second honeycomb layer 321 are both fixedly mounted on the side wall of the housing 1. Two first positive electrode posts 211 are electrically connected to one first honeycomb layer 311 and one second honeycomb layer 321, respectively. Two second positive electrode posts 221 are electrically connected to the other first honeycomb layer 311 and one second honeycomb layer 321, respectively. A first conductive plate 61 is fixedly mounted on the side wall of each first honeycomb layer 311. The first conductive plate 61 is connected to the first honeycomb layer 311 via an insulating layer made of a high-molecular polymer insulating material, ensuring insulation between the first honeycomb layer 311 and the first conductive plate 61. The first conductive plate 61 is electrically connected to the first honeycomb layer 311 at the first fold 33. The first conductive plate 61 is rolled up along with the first honeycomb layer 311, reducing the space occupied by the first conductive plate 61 within the honeycomb body 4 and improving the ease of installation of the first conductive plate 61 and the second conductive plate 62. The tail of the first conductive plate 61, which is connected to the first positive terminal 211, is connected to the first negative terminal 231 to form a first current flow path 71. The tail of the first conductive plate 61, which is connected to the second positive terminal 221, is connected to the second negative terminal 241 to form a second current flow path 72.

[0033] A second conductive plate 62 is fixedly provided on the side wall of each second honeycomb layer 321. The second conductive plate 62 is connected to the second honeycomb layer 321 through an insulating layer. The insulating layer is a polymer insulating material to ensure insulation between the second honeycomb layer 321 and the second conductive plate 62. The second conductive plate 62 and the second honeycomb layer 321 are electrically connected at the second fold 34. The second conductive plate 62 is rolled up along with the second honeycomb layer 321 to reduce the space occupied by the second conductive plate 62 in the honeycomb body 4 and improve the ease of installation of the second conductive plate 62. The tail of the second conductive plate 62 connected to the first positive electrode post 211 is connected to the first negative electrode post 231 to form a first current flow path 71. The tail of the second conductive plate 62 connected to the second positive electrode post 221 is connected to the second negative electrode post 241 to form a second current flow path 72. The first current flow path 71 and the second current flow path 72 are arranged alternately along the radial direction of the honeycomb body 4.

[0034] When the honeycomb 4 inside the housing 1 is electrically heated, the current acts on a first honeycomb layer 311 and a second honeycomb layer 321 through the first positive electrode 21, and then conducts through the first conductive plate 61 and the second conductive plate 62 to the first negative electrode 23, forming two first current flow paths 71 with the same heating state. The second positive electrode 22 forms two circuits with the other first honeycomb layer 311, the second honeycomb layer 321 and the corresponding first conductive plate 61 and the second conductive plate 62, thereby forming two second current flow paths 72 with the same heating state. The two first current flow paths 71 and the two second current flow paths 72 are arranged alternately, so that the first current flow paths 71 and the second current flow paths 72 are more evenly distributed on the honeycomb 4, thereby providing uniformity of electric heating of the honeycomb 4.

[0035] In this embodiment, both the first honeycomb layer 311 and the second honeycomb layer 321 include corrugated sheets 81 and two support sheets 82. The corrugated sheets 81 are disposed between the two support sheets 82, and the thickness of the support sheets 82 is 25 micrometers to 35 micrometers. A channel for exhaust gas to flow is formed between the corrugated sheets 81 and the support sheets 82. A catalyst can be coated on the corrugated sheets 81 and the support sheets 82. A space for placing the catalyst is formed between the support sheets 82 and the corrugated sheets 81. When the exhaust gas flows through the channel, it comes into contact with the catalyst, completing the catalytic treatment of the exhaust gas.

[0036] Two first positive terminals 211 and two first negative terminals 231 are respectively connected to the positive and negative terminals of an external power supply, ensuring that the current applied to the two first positive terminals 211 and the first negative terminals 231 is the same, resulting in the same heating effect produced by the two first current flow paths 71 on the honeycomb structure 4. Two second positive terminals 221 and two second negative terminals 241 are respectively connected to the positive and negative terminals of another external power supply, ensuring that the current applied to the two second positive terminals 221 and the second negative terminals 241 is the same, resulting in the same heating effect produced by the two second current flow paths 72 on the honeycomb structure 4. Powering the two first current flow paths 71 and the two second current flow paths 72 through the two first positive terminals 211 and the two second positive terminals 221 respectively facilitates control of each current flow path.

[0037] The first positive electrode post 211 and the second positive electrode post 221 are both threaded into the housing 1. The first positive electrode post 211 and the second positive electrode post abut against the corrugated sheet 81 in the first honeycomb layer 311 and the second honeycomb layer 321, respectively, to form a passage.

[0038] Both the first conductive plate 61 and the second conductive plate 62 have a connecting end 91 at their ends. The housing 1 has a connecting groove 92 corresponding to the connecting end 91. The connecting groove 92 is arranged along the axial direction of the housing 1. The connecting end 91 can be inserted into the connecting groove 92. The outer side of the housing 1 has a threaded seat 93 corresponding to the connecting groove 92. Each threaded seat 93 has a threaded hole arranged radially along the housing 1. Each first negative terminal 231 and each second negative terminal 241 corresponds to a threaded seat 93. The housing 1 has a mounting hole 94 at the position corresponding to the threaded hole on each threaded seat 93. The mounting hole 94 corresponds to the connecting groove 92. The first negative terminal 231 and the second negative terminal 241 are screwed into the threaded hole on the threaded seat 93 and inserted into the mounting hole 94, abutting against the connecting end 91 to form an electrical connection between the first negative terminal 231 or the second negative terminal 241 and the connecting end 91.

[0039] The first negative terminal 231 and the second negative terminal 241 are threadedly connected to the housing 1. The first negative terminal 231 and the second negative terminal 241 pass through the corresponding mounting holes 94 and are electrically connected to their respective connections, thereby improving the ease of installation of the first negative terminal 231 and the second negative terminal 241. The threaded seat 93 improves the strength of the connection between the first negative terminal 231 and the second negative terminal 241 and the housing 1.

[0040] The implementation principle of a multi-stage heated honeycomb structure in this application embodiment is as follows: When the honeycomb structure 4 inside the housing 1 is electrically heated, the current acts on a first honeycomb layer 311 and a second honeycomb layer 321 through the first positive electrode 21, and then is connected to the first negative electrode 23 through the first conductive plate 61 and the second conductive plate 62 respectively, forming two first current flow paths 71 with the same heating state. The second positive electrode 22 forms two paths with the other first honeycomb layer 311, the second honeycomb layer 321 and the corresponding first conductive plate 61 and the second conductive plate 62 respectively, thereby forming two second current flow paths 72 with the same heating state. The two first current flow paths 71 and the two second current flow paths 72 are spaced apart, so that the first current flow paths 71 and the second current flow paths 72 are more evenly distributed on the honeycomb structure 4, thereby providing uniformity of electric heating of the honeycomb structure 4.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A multi-stage heated honeycomb structure, characterized in that: The device includes a housing (1), a first positive electrode (21), a second positive electrode (22), a first negative electrode (23), a second negative electrode (24), a first layer group (31), and a second layer group (32). The first layer group (31) and the second layer group (32) are wound around each other in an S-shape inside the housing (1) to form a honeycomb body (4). The first layer group (31) forms a first fold (33) at the center of the honeycomb body (4), and the second layer group (32) forms a second fold (34) at the center of the honeycomb body (4). The first fold (33) is provided with a first insulating member (51) to divide the first layer group (31) into two electrically insulating first honeycomb layers (311). The second fold (34) is provided with a second insulating member (52) to divide the second layer group (32) into two electrically insulating second honeycomb layers (321). Each first honeycomb layer (311) is insulatedly connected to a first conductive plate (61), and each second honeycomb layer (321) is insulatedly connected to a second conductive plate (62). One first honeycomb layer (311) and one second honeycomb layer (321) are electrically connected to the first positive electrode (21), and one first conductive plate (61) and one second conductive plate (62) are electrically connected to the first negative electrode (23) so that two first current flow paths (71) can be formed on the honeycomb body (4). Another first honeycomb layer (311), the second honeycomb layer (321) are electrically connected to the second positive electrode (22), and another first conductive plate (61), the second conductive plate (62) are electrically connected to the second negative electrode (24), so as to form two second current flow paths (72) on the honeycomb body (4); The first current flow path (71) and the second current flow path (72) are arranged alternately along the radial direction of the honeycomb (4); Both the first honeycomb layer (311) and the second honeycomb layer (321) include a corrugated sheet (81) and two support sheets (82). The corrugated sheet (81) is disposed between the two support sheets (82), and a channel for exhaust gas to flow is formed between the corrugated sheet (81) and the support sheets (82). The first insulating member (51) includes a first insulating plate (511), and two first honeycomb layers (311) are located on both sides of the first insulating plate (511). The second insulating member (52) includes a second insulating plate (521), and two second honeycomb layers (321) are located on both sides of the second insulating plate (521). The first conductive plate (61) is attached to the outside of the support piece (82) of the first honeycomb layer (311) through an insulating layer and is wound along with the first layer group (31). The second conductive plate (62) is attached to the outside of the support piece (82) of the second honeycomb layer (321) through an insulating layer and is wound along with the second layer group (32). The first conductive plate (61) and the first honeycomb layer (311) are electrically connected at the first fold (33), and the second conductive plate (62) and the second honeycomb layer (321) are electrically connected at the second fold (34).

2. The multi-stage heated honeycomb structure according to claim 1, characterized in that: The housing (1) is made of insulating material. The first positive electrode (21) includes two first positive electrode posts (211). The two first positive electrode posts (211) are threaded through the housing (1) and electrically connected to the first honeycomb layer (311) and the second honeycomb layer (321) respectively. The second positive electrode (22) includes two second positive electrode posts (221). The two second positive electrode posts (221) are threaded through the housing (1) and electrically connected to the first honeycomb layer (311) and the second honeycomb layer (321) respectively.

3. The multi-stage heated honeycomb structure according to claim 2, characterized in that: Both the first conductive plate (61) and the second conductive plate (62) have a connection end (91) at their ends. The housing (1) has a connection groove (92) that corresponds to the connection end (91) one by one. The connection end (91) can be inserted into the connection groove (92). The first negative electrode (23) is electrically connected to the second negative electrode (24).

4. The multi-stage heated honeycomb structure according to claim 3, characterized in that: The first negative electrode (23) includes two first negative terminals (231), and the second negative electrode (24) includes two second negative terminals (241). The two first negative terminals (231) and the two second negative terminals (241) are all disposed on the housing (1) and are electrically connected to the corresponding connection terminal (91).

5. The multi-stage heated honeycomb structure according to claim 4, characterized in that: The housing (1) has mounting holes (94) that correspond one-to-one with and are connected to the connecting groove (92). The first negative terminal (231) and the second negative terminal (241) are respectively threaded into the mounting holes (94) and abut against the corresponding connecting ends (91).

6. The multi-stage heated honeycomb structure according to claim 5, characterized in that: The outer wall of the housing (1) is provided with threaded seats (93) corresponding to the mounting holes (94) one by one. The first negative terminal (231) and the second negative terminal (241) are respectively threaded to the corresponding threaded seats (93).

7. The multi-stage heated honeycomb structure according to claim 1, characterized in that: The thickness of the support sheet (82) of the first layer group (31) and the second layer group (32) is 25 micrometers to 35 micrometers.

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