Extraction and separation device for producing 2, 4-dichloronitrobenzene
By setting up a sleeve and a stirring rod in the extraction and separation device for 2,4-dichloronitrobenzene production, and using bearings to control the rotation speed difference and combining the spiral plate and vortex blade structure, the problem of motor power and speed limit is solved, and a more efficient mixing and extraction effect is achieved.
Patent Information
- Application Number
- CN202422418216.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-30
AI Technical Summary
In the current production process of 2,4-dichloronitrobenzene, the extraction efficiency and extraction effect are limited by the motor power and rotation speed, and the motor speed is too fast, resulting in uneven mixing of the two-phase materials, affecting mass transfer and extraction efficiency.
A sleeve and a stirring rod are arranged in the extraction and separation device, and the rotation speed difference between the stirring rod and the drum is controlled by bearings. Combined with the spiral plate, mixing through holes and vortex blade structures, the mixing effect and mass transfer efficiency are improved.
Without increasing the motor speed, more uniform mixing and higher mass transfer and extraction efficiency are achieved, thereby improving the extraction effect of the device.
Smart Images
Figure CN223112393U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of extraction equipment, in particular to an extraction and separation device for the production of 2,4-dichloronitrobenzene. Background Art
[0002] 2,4-dichloronitrobenzene is an organic compound with the chemical formula C6H3Cl2NO2 and a molecular weight of 192.00. It is in the form of a colorless to light yellow crystalline solid and is an important intermediate for organic chemical products such as organic synthesis, pesticides, pharmaceuticals, and dyes. 2,4-dichloronitrobenzene is an organic nitro compound with strong oxidizing properties, which can form different derivatives and participate in various reactions such as nitration and chlorination. During the production process of 2,4-dichloronitrobenzene, the separation and purification of the synthesis products are involved. Currently, the commonly used separation method is extraction, and the corresponding device used is an extraction centrifuge. An extraction centrifuge is a new type, fast, and efficient liquid-liquid mixing and separation device. The extraction centrifuge uses an electric motor to drive the drum and the bottom impeller (rotating synchronously with the drum) to rotate at a high speed. Two liquids with different densities and immiscible with each other (such as light-phase materials and heavy-phase materials, aqueous phase and organic phase, etc.) are dispersed and fully contacted under the action of the shear force generated by the rotation of the drum or the bottom impeller, completing the mass transfer of the two phases. Then, they are quickly separated under the action of the centrifugal force generated by the high-speed rotation of the drum. It can be seen that the more fully the light-phase material and the heavy-phase material are mixed, the more conducive it is to mass transfer and extraction. However, the current equipment often improves the mixing effect and extraction effect by increasing the rotation speed. However, the power of the electric motor is limited, and its rotation speed is limited. Therefore, the extraction efficiency of the current extraction centrifuge is limited by the power and rotation speed of the electric motor, resulting in poor extraction efficiency and extraction effect. Moreover, in the prior art, due to the too-fast rotation speed of the electric motor, the bottom impeller driven by the main shaft rotates at a high speed, causing the light-phase material and the heavy-phase material at the bottom of the device to be sent into the drum for centrifugal extraction before being evenly mixed in the mixing chamber, resulting in poor mass transfer efficiency and extraction efficiency and affecting the use effect. Summary of the Utility Model
[0003] The utility model provides an extraction and separation device for the production of 2,4-dichloronitrobenzene, aiming to solve the problems that the extraction efficiency and extraction effect of the existing device are limited by the power and rotation speed of the electric motor and are not good, and the uneven mixing of the two-phase materials caused by the too-fast rotation speed of the electric motor, resulting in poor mass transfer efficiency and extraction efficiency.
[0004] Specifically, the present utility model provides an extraction and separation device for the production of 2,4-dichloronitrobenzene, comprising: a housing, in which a rotating drum is provided, and the rotating drum is connected to a motor at the top of the housing through a main shaft; between the housing and the rotating drum, it is separated by a partition to form a heavy-phase collection chamber, a light-phase collection chamber and a mixing chamber distributed from top to bottom; on one side of the middle part of the housing located in the mixing chamber, there is a light-phase inlet, and on the side wall of the housing opposite to the light-phase inlet, there is a heavy-phase inlet; on one side of the upper part of the housing, there is a heavy-phase outlet, and on the top of the rotating drum, there is a heavy-phase weir plate, and the heavy-phase outlet is connected to the heavy-phase weir plate through the heavy-phase collection chamber; on the side wall of the housing opposite to the heavy-phase outlet, there is a light-phase outlet, and below the heavy-phase weir plate, there is a light-phase weir plate, and the light-phase outlet is connected to the light-phase weir plate through the light-phase collection chamber.
[0005] Further, a feed inlet is provided at the center of the bottom of the rotating drum, and a baffle is provided on the main shaft above the feed inlet; a feed pipe is connected below the feed inlet, and an annular baffle is provided on the outer side of the bottom of the feed pipe, and the outer diameter of the baffle is the same as the outer diameter of the rotating drum; the main shaft extends downward and is rotatably connected to the bottom wall of the housing; a sleeve is sleeved outside the main shaft between the baffle and the housing, the sleeve is rotatably connected to the main shaft through a bearing, and a plurality of stirring rods are fixedly connected to the outside of the sleeve, the stirring rods are L-shaped rods, and the top of the stirring rods is not higher than the positions of the light-phase inlet and the heavy-phase inlet.
[0006] Further, a spiral plate is provided on the outside of each stirring rod.
[0007] Further, a plurality of mixing through-holes are evenly formed on the spiral plate.
[0008] Further, the bottom wall of the housing is a concave arc surface or a conical surface; a plurality of eddy current vanes are distributed on the bottom wall of the housing, and the eddy current vanes are evenly spaced in the circumferential direction of the main shaft.
[0009] Further, the eddy current vanes are arc-shaped vanes, the feed end of the eddy current vanes is the end far from the main shaft, and the discharge end of the eddy current vanes is the end close to the main shaft; along the direction from the feed end to the discharge end, the height of the eddy current vanes gradually increases.
[0010] Further, the tangent line at the discharge end of the eddy current vane is tangent to the outside of the main shaft.
[0011] Further, a plurality of convex columns are evenly distributed on the two side wall surfaces of the eddy current vane, and the convex columns are circular convex columns or square convex columns.
[0012] Further, a plurality of eddy current through-holes are evenly formed on the two side walls of the eddy current vane.
[0013] The extraction and separation device for the production of 2,4-dichloronitrobenzene provided by the present utility model sets a sleeve and stirring rods on the main shaft, and controls the rotation speed of the stirring rods by using connectors - bearings with different rotation speeds, so that there is a rotation speed difference between the stirring rods and the drum, thereby providing different degrees of mixing effects and mass transfer effects for the two-phase liquids in the mixing chamber. Without increasing the rotation speed of the motor, the purpose of more uniformly stirring and mixing the mixed liquid by the stirring rods is finally achieved, so that the mass transfer effect, extraction efficiency and extraction effect are no longer limited by the motor power and rotation speed, which is beneficial to improving the mass transfer efficiency and extraction efficiency of the device, and making its extraction efficiency and extraction effect superior to those of traditional extraction centrifuges.
[0014] The stirring rods of the device are used in cooperation with the spiral plates and mixing through-holes, which can provide multiple different flow directions for the two-phase liquids in the mixing chamber, improve the mixing mass transfer effect, and at the same time can slow down the impact force during the liquid flow process, ensuring the stability of the rotation of the stirring rods. It has the advantages of simple structure, sufficient two-phase mixing and higher extraction efficiency.
[0015] The device sets eddy current blades on the bottom wall of the housing, and in cooperation with the structure of the eddy current blades themselves and the convex columns and eddy current through-holes on them, can further strengthen the mixing degree and mass transfer effect of the mixed liquid in the mixing chamber, which is beneficial to improving its mass transfer efficiency and extraction effect.
[0016] The device is not limited to the production of 2,4-dichloronitrobenzene in the present utility model, but can also be used in the production process of other chemical materials. At the same time, like traditional extraction centrifuges, the device can be used in series in multiple stages and is suitable for the operation processes of continuous extraction and continuous centrifugation in the chemical industry. Description of the Drawings
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0018] Figure 1 It is a schematic structural diagram of the extraction and separation device for the production of 2,4-dichloronitrobenzene provided by an embodiment of the present utility model;
[0019] Figure 2 It is a schematic structural diagram of the stirring rod provided by an embodiment of the present utility model;
[0020] Figure 3 It is a schematic structural diagram of the eddy current blades on the bottom wall of the housing provided by an embodiment of the present utility model.
[0021] Description of the Reference Numerals:
[0022] 1. Housing, 2. Rotary drum, 3. Main shaft, 4. Motor, 11. Heavy-phase collection chamber, 12. Light-phase collection chamber, 13. Mixing chamber, 14. Light-phase inlet, 15. Heavy-phase inlet, 16. Heavy-phase outlet, 17. Light-phase outlet, 18. Eddy-current blade, 21. Heavy-phase weir plate, 22. Light-phase weir plate, 23. Baffle plate, 24. Feed pipe, 25. Baffle, 26. Sleeve, 27. Stirring rod, 181. Convex column, 182. Eddy-current through hole, 271. Spiral plate, 272. Mixing through hole. Detailed implementation manner
[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be described clearly and completely below. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts also belong to the protection scope of the present utility model.
[0024] Embodiment 1
[0025] As Figure 1 shown, an extraction and separation device for the production of 2,4-dichloronitrobenzene provided by the present utility model includes: a housing 1, a rotary drum 2 is provided in the housing 1, and the rotary drum 2 is connected to a motor 4 at the top of the housing 1 through a main shaft 3; a heavy-phase collection chamber 11, a light-phase collection chamber 12, and a mixing chamber 13 are formed by partitioning between the housing 1 and the rotary drum 2 and are distributed from top to bottom; a light-phase inlet 14 is provided on one side of the middle part of the housing 1 in the mixing chamber 13, and a heavy-phase inlet 15 is provided on the side wall of the housing 1 opposite to the light-phase inlet 14; a heavy-phase outlet 16 is provided on one side of the upper part of the housing 1, a heavy-phase weir plate 21 is provided at the top of the rotary drum 2, and the heavy-phase outlet 16 is connected to the heavy-phase weir plate 21 through the heavy-phase collection chamber 11; a light-phase outlet 17 is provided on the side wall of the housing 1 opposite to the heavy-phase outlet 16, a light-phase weir plate 22 is provided below the heavy-phase weir plate 21, and the light-phase outlet 17 is connected to the light-phase weir plate 22 through the light-phase collection chamber 12; a feed inlet is provided at the center of the bottom of the rotary drum 2, and a baffle plate 23 is provided on the main shaft 3 above the feed inlet; a feed pipe 24 is connected below the feed inlet, an annular baffle 25 is provided on the outer side of the bottom of the feed pipe 24, and the outer diameter of the baffle 25 is the same as the outer diameter of the rotary drum 2; the main shaft 3 extends downward and is rotatably connected to the bottom wall of the housing 1; a sleeve 26 is sleeved on the outer side of the main shaft 3 between the baffle 25 and the housing 1, the sleeve 26 is rotatably connected to the main shaft 3 through a bearing (routinely provided, not shown in the drawings), and a plurality of stirring rods 27 are fixedly connected to the outer side of the sleeve 26. The stirring rods 27 are L-shaped rods, and the top of the stirring rods 27 is not higher than the positions of the light-phase inlet 14 and the heavy-phase inlet 15.
[0026] When using this extraction and separation device, the main shaft 3 is driven to rotate by the motor 4, and the main shaft 3 drives the rotating drum 2 to rotate. The light-phase liquid enters the mixing chamber 13 through the light-phase inlet 14, and the heavy-phase liquid enters the mixing chamber 13 through the heavy-phase inlet 15. The two-phase liquids contact, mix, and mass-transfer in the mixing chamber 13. At the same time, the baffle 25 below the feed pipe 24 blocks the two-phase liquids and the rotating drum 2, so that the two-phase liquids are more concentrated in the mixing chamber 13. The stirring rod 27 provided on the sleeve 26 below the main shaft 3 also rotates in the mixing chamber 13 along with the main shaft 3. The stirring rod 27 can enhance the mixing degree and mass-transfer efficiency between the two-phase liquids in the mixing chamber 13, improving the mixing effect of the two-phase materials. At the same rotation speed, the rotation speed of the stirring rod 27 can be controlled by replacing bearings with different rotation speeds, so that there is a rotation speed difference between the stirring rod 27 and the rotating drum 2, thereby providing different degrees of mixing effects and mass-transfer effects to the two-phase liquids in the mixing chamber 13. Finally, the purpose of making the stirring rod 27 stir and mix the mixed liquid more evenly is achieved, so that the mass-transfer effect, extraction efficiency, and extraction effect are no longer limited by the power and rotation speed of the motor 4, which is beneficial to improving the mass-transfer efficiency and extraction efficiency of this device.
[0027] After the two-phase liquids are stirred in the mixing chamber 13 to form a mixed liquid, the mixed liquid enters the inside of the rotating drum 2 through the feed pipe 24 and the feed port after being diverted by the baffle 23. Under the action of centrifugal force, the heavy-phase liquid with a large density gradually moves away from the center of the rotating drum 2 and leans towards the wall of the rotating drum 2 during the upward flow, and the light-phase liquid with a small density gradually moves away from the wall of the rotating drum 2 and leans towards the center. During the centrifugal separation of the heavy and light phases, the extraction of 2,4-dichloronitrobenzene is also completed. Finally, the light-phase liquid is collected by the light-phase weir plate 22 and enters the light-phase collection chamber 12, and flows out through the light-phase outlet 17. The heavy-phase liquid is collected by the heavy-phase weir plate 21 and enters the heavy-phase collection chamber 11, and flows out through the heavy-phase outlet 16. Compared with the traditional centrifugal extractor, this device has a higher mass-transfer efficiency at the same rotation speed, thus improving the extraction efficiency.
[0028] Example 2
[0029] As Figure 2 shown, on the basis of the above embodiment, this embodiment further includes: a spiral plate 271 is provided on the outer side of each stirring rod 27. The spiral plate 271 rotates in the mixing chamber 13 along with the stirring rod 27. The spiral plate 271 can make some light / heavy-phase liquids in the mixing chamber 13 flow in a spiral direction along the spiral plate 271, and its flow direction is different from that of the stirring rod 27 which can only rotate in the horizontal direction, helping to improve the mixing effect of the two-phase liquids in the mixing chamber 13.
[0030] Furthermore, a plurality of mixing through-holes 272 are evenly formed in the spiral plate 271. The function of the mixing through-holes 272 is similar to that of the spiral plate 271. It can enable some two-phase liquids to flow through the mixing through-holes 272 during rotation, providing another flow direction, enhancing the mixing and mass transfer effect, and at the same time reducing the impact force during the liquid flow, ensuring the stability of the rotation of the stirring rod 27.
[0031] During operation, the spiral plate 271 rotates with the stirring rod 27. The stirring rod 27 provides agitation in the horizontal direction, while the spiral plate 271 can make some two-phase liquids colliding thereon flow along its spiral direction. At the same time, some two-phase liquids can also directly flow through the mixing through-holes 272, making the two-phase liquids in the mixing chamber 13 have different flow directions, intensifying the dispersion and disorder degree inside, thereby enhancing the mixing and mass transfer effect.
[0032] Embodiment 3
[0033] As Figure 3 shown, on the basis of the above embodiment, this embodiment further includes: the bottom wall of the housing 1 is a concave arc surface or a conical surface; a plurality of eddy current vanes 18 are distributed on the bottom wall of the housing 1, and the eddy current vanes 18 are evenly spaced in the circumferential direction of the main shaft 3.
[0034] In order to strengthen the mixing degree and mass transfer effect of the mixed liquid in the mixing chamber 13, in addition to the stirring effect of the stirring rod 27, the eddy current vanes 18 on the bottom wall of the housing 1 can also provide drainage and mixing effects on the mixed liquid. A mixed liquid channel is formed between adjacent eddy current vanes 18, enabling the mixed liquid to concentrate from the periphery to the center, facilitating its upward entry into the feed pipe 24 and the drum 2. At the same time, the mixed liquid is intercepted and dispersed by the eddy current vanes 18 and dispersed into multiple streams of material flows with different flow directions. When they converge at the center, that is, at the main shaft 3, collisions, contacts, mixing, and mass transfer will occur between different material flows, improving the mixing degree of the mixed liquid after convergence and being conducive to enhancing its mass transfer efficiency and extraction effect.
[0035] Furthermore, the eddy current vane 18 is an arc-shaped vane. The feed end of the eddy current vane 18 is the end far from the main shaft 3, and the discharge end of the eddy current vane 18 is the end close to the main shaft 3; along the direction from the feed end to the discharge end, the height of the eddy current vane 18 gradually increases. The arc-shaped vane can weaken the impact force of the mixed liquid on the eddy current vane 18 and has a buffering effect. The heights of the feed end and the discharge end of the eddy current vane 18 are inconsistent, which can reduce the impact degree of the feed end during intercepting and diverting the mixed liquid, extend the service life of the eddy current vane 18, and at the same time, it is also convenient for the material flows in different channels after diversion to cross the eddy current vane 18 for mixing, enhancing the mixing degree of the material flows in different channels.
[0036] Furthermore, the tangent line at the discharge end of the eddy current blade 18 is tangent to the outer side of the main shaft 3. The eddy current blade 18 guides the mixed liquid towards the central position of the housing 1. In order to prevent the mixed liquid discharged from the discharge end from impacting and affecting the rotation of the main shaft 3 which is also at the central position, the discharge end is tangent to the main shaft 3, so that the impact direction of the material flow does not directly point to the main shaft 3, thereby avoiding adverse effects of the material flow on the rotation of the main shaft 3 and also making it not easy to form an impact congestion situation here.
[0037] During operation, the mixed liquid subjected to the stirring and mixing action of the stirring rod 27 first concentrates between the housing 1 and the baffle 25, and then enters the drum 2 through the feed pipe 24. When the mixed liquid stays briefly at the bottom of the housing 1, the eddy current blade 18 disperses the mixed liquid, causing it to form multiple material flows with different flow directions along the eddy current blade 18 and capable of mixing across channels with each other, and converging from the periphery of the housing 1 towards the central position. When the material flows with different flow directions converge, they can collide, mix, and perform mass transfer, thereby further enhancing the mixing degree and mass transfer effect of the mixed liquid and providing a better operation basis for the subsequent extraction and centrifugal separation in the drum 2.
[0038] Example 4
[0039] Based on the above embodiments, this embodiment further includes: a plurality of convex columns 181 are evenly distributed on the two side wall surfaces of the eddy current blade 18, and the convex columns 181 are circular convex columns 181 or square convex columns 181. The circular convex columns 181 or square convex columns 181 provided on the eddy current blade 18 can cause a certain degree of flow disturbance to the mixed liquid when the mixed liquid of the light and heavy phases flows along the eddy current blade 18, thereby being beneficial to improving the mixing effect and extraction mass transfer effect of the mixed liquid.
[0040] Furthermore, a plurality of eddy current through holes 182 are evenly opened on the two side walls of the eddy current blade 18. Eddy current through holes 182 can also be provided on the eddy current blade 18, so that part of the mixed liquid passes through the eddy current through holes 182 to change the flow direction, and can also be mixed with the mixed liquid in another flow channel to improve the mixing effect. The above convex columns 181 and eddy current through holes 182 can be provided simultaneously or one of them can be provided.
[0041] During operation, the mixed liquid flows along with the curvature of the eddy current blade 18. The convex columns 181 on the eddy current blade 18 can change the flow direction of part of the mixed liquid. Similarly, the eddy current through holes 182 can also enable part of the mixed liquid to directly pass through the current eddy current blade 18 and be mixed with the mixed liquid in the adjacent channel, so that the mixed liquid also has a mixing dynamics when flowing between the eddy current press plates, improving the mixing effect.
[0042] It should be noted that in the present utility model, the detailed structures of some devices are not described in detail, but they belong to the prior art known to those skilled in the art, so they will not be elaborated here. In addition, the parts not involved in this device are the same as the prior art or can be implemented by using the prior art.
[0043] It should be noted that pressure sensors, flow meters or temperature sensors are provided on the conveying pipelines inside the device between different units and devices, and different valves are also provided, such as pressure relief valves, pressure regulating valves, safety valves, etc., which are used to adjust and stabilize the pressure of the entire device.
[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.
Claims
1. An extraction and separation device for the production of 2,4-dichloronitrobenzene, characterized in that, It includes: a housing, in which a rotating drum is provided, and the rotating drum is connected to a motor at the top of the housing through a main shaft; between the housing and the rotating drum, a heavy-phase collection chamber, a light-phase collection chamber and a mixing chamber are separated by a partition plate and distributed from top to bottom; on one side of the middle part of the housing located in the mixing chamber, a light-phase inlet is provided, and on the side wall of the housing opposite to the light-phase inlet, a heavy-phase inlet is provided; on one side of the upper part of the housing, a heavy-phase outlet is provided, on the top of the rotating drum, a heavy-phase weir plate is provided, and the heavy-phase outlet is connected to the heavy-phase weir plate through the heavy-phase collection chamber; on the side wall of the housing opposite to the heavy-phase outlet, a light-phase outlet is provided, below the heavy-phase weir plate, a light-phase weir plate is provided, and the light-phase outlet is connected to the light-phase weir plate through the light-phase collection chamber. At the center of the bottom of the rotating drum, a feed inlet is provided, and on the main shaft above the feed inlet, a baffle is provided; below the feed inlet, a feed pipe is connected, and on the outer side of the bottom of the feed pipe, an annular baffle is provided, and the outer diameter of the baffle is the same as the outer diameter of the rotating drum; the main shaft extends downward and is rotatably connected to the bottom wall of the housing; outside the main shaft between the baffle and the housing, a sleeve is sleeved, the sleeve is rotatably connected to the main shaft through a bearing, and a plurality of stirring rods are fixedly connected to the outside of the sleeve, the stirring rods are L-shaped rods, and the top of the stirring rods is not higher than the positions of the light-phase inlet and the heavy-phase inlet.
2. The extraction and separation device for the production of 2,4-dichloronitrobenzene according to claim 1, wherein, On the outside of each of the stirring rods, a spiral plate is provided.
3. The extraction and separation device for the production of 2,4-dichloronitrobenzene according to claim 2, wherein, A plurality of mixing through-holes are evenly formed in the spiral plate.
4. The extraction and separation device for the production of 2,4-dichloronitrobenzene according to any one of claims 1-3, characterized in that, The bottom wall of the housing is a concave arc surface or a conical surface; a plurality of eddy current vanes are distributed on the bottom wall of the housing, and the eddy current vanes are evenly spaced in the circumferential direction of the main shaft.
5. The extraction and separation device for the production of 2,4-dichloronitrobenzene according to claim 4, wherein, The eddy current vanes are arc-shaped vanes, the feed end of the eddy current vanes is the end far from the main shaft, and the discharge end of the eddy current vanes is the end close to the main shaft; along the direction from the feed end to the discharge end, the height of the eddy current vanes gradually increases.
6. The extraction and separation device for the production of 2,4-dichloronitrobenzene according to claim 5, wherein, The tangent line at the discharge end of the eddy current vane is tangent to the outside of the main shaft.
7. The extraction and separation device for the production of 2,4-dichloronitrobenzene according to claim 4, characterized in that, A plurality of convex columns are evenly distributed on the two side wall surfaces of the eddy current vane, and the convex columns are circular convex columns or square convex columns.
8. The extraction and separation device for the production of 2,4-dichloronitrobenzene according to claim 4, characterized in that, A plurality of eddy current through-holes are evenly formed in the two side walls of the eddy current vane.