A centrifugal oil mist purifier

Abstract

The application discloses a centrifugal oil mist purifier, and belongs to the technical field of oil mist purifiers.The technical scheme is as follows: a shell is arranged, a separation cavity is arranged in the shell, an oil mist inlet, an oil outlet and an exhaust port are arranged on the shell and are communicated with the separation cavity, a motor is arranged in the shell, an impeller is connected to the output end of the motor, the motor can drive the impeller to rotate, a filter element for filtering gas is arranged in the shell, an annular supporting element is connected to the output end of the motor, the annular supporting element is located directly below the impeller, a plurality of scraping teeth are arranged on the outer circumferential side of the annular supporting element, the plurality of scraping teeth are uniformly distributed along the circumferential direction of the annular supporting element, the plurality of scraping teeth are made of elastic material and are in elastic contact with the inner cavity wall of the separation cavity, the motor can drive the annular supporting element to rotate and reciprocate along the axial direction, so that the annular supporting element drives the scraping teeth to scrape the inner cavity wall of the separation cavity, and the oil mist purifier can automatically and efficiently clean the oil accumulated on the inner wall of the separation cavity.

Description

Technical Field

[0001] This invention belongs to the technical field of oil mist purifiers, and specifically relates to a centrifugal oil mist purifier. Background Technology

[0002] In the fields of metal cutting, grinding, and die casting, machine tools and other equipment generate a large amount of oil mist during high-speed operation. This oil mist is formed by the mixing of atomized cutting oil and lubricating oil particles with air. It not only adheres to the surface of the equipment and the workpiece, affecting product precision, but also enters the body of operators through the respiratory tract, posing a health hazard. It may also cause fire hazards in the workshop and waste oil. To solve the above problems, centrifugal oil mist purifiers have become one of the most widely used oil mist purification devices in the industrial field due to their advantages such as compact structure, high separation efficiency, and adaptability to medium and high concentrations of oil mist.

[0003] Traditional centrifugal oil mist purifiers utilize centrifugal force to separate oil mist: oil-mist-containing gas enters the separation chamber inside the outer shell through the inlet, and the motor drives the impeller to rotate at high speed, generating strong centrifugal force. Because the density of oil mist droplets is much greater than that of air, the droplets are thrown against the inner wall of the chamber under the action of centrifugal force, detach from the airflow to form an oil film, and flow along the wall surface, eventually being recovered through the oil outlet. The purified gas is further filtered by the filter element and discharged from the exhaust port. However, traditional centrifugal oil mist purifiers face a core technical challenge in long-term operation—oil accumulation on the inner wall leads to decreased efficiency and requires frequent shutdowns for cleaning. The oil mist droplets are highly viscous and easily form stubborn grease deposits after contacting the wall surface. Currently, the industry generally uses manual periodic cleaning, which requires high-pressure water gun washing after shutdown, disassembly and alkaline water soaking, or scraping with a scraper. This method is labor-intensive, has low cleaning efficiency, and can cause long-term production interruptions, affecting production efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a centrifugal oil mist purifier. The technical problem to be solved by this invention is: how to automatically and efficiently clean the oil accumulated on the inner wall of the separation chamber.

[0005] The above-mentioned technical objective of the present invention can be achieved through the following technical solution: a centrifugal oil mist purifier, comprising a housing, a separation chamber disposed within the housing, an oil mist inlet, an oil outlet, and an exhaust outlet adapted on the housing to communicate with the separation chamber, a motor disposed within the housing, an impeller coaxially connected to the output end of the motor, the motor driving the impeller to rotate, a filter element for gas filtration disposed within the housing, a ring support member drivenly connected to the output end of the motor, the ring support member being located directly below the impeller, a plurality of scraping teeth disposed on the outer periphery of the ring support member, the plurality of scraping teeth being evenly distributed along the circumference of the ring support member, the plurality of scraping teeth being made of elastic material and maintaining elastic contact with the inner wall of the separation chamber, the motor driving the ring support member to rotate and reciprocate along its axial direction, thereby causing the ring support member to drive the scraping teeth to scrape the inner wall of the separation chamber.

[0006] In the centrifugal oil mist purifier described above, there is an oil guide groove between two adjacent scraper teeth. The bottom surface of the oil guide groove is inclined from the outside to the inside and from top to bottom. The lower surface of the annular support is detachably connected to an annular oil collection seat. The oil collection seat has an annular oil collection groove. The lowest point of the oil guide groove is located directly above the annular oil collection groove. The bottom surface of the annular oil collection groove is inclined from the inside to the outside and from top to bottom.

[0007] In the centrifugal oil mist purifier described above, the output end of the motor is coaxially connected to the sun gear of the planetary gear set. A bracket is connected to the three planet gears of the planetary gear set, and a connecting shaft is provided on the bracket. The connecting shaft is coaxially arranged with the sun gear of the planetary gear set. A spline sleeve is coaxially fixed on the annular support member, and the connecting shaft is splinedly engaged with the spline sleeve.

[0008] In the aforementioned centrifugal oil mist purifier, a first transmission gear is coaxially mounted on the spline sleeve, and a second transmission gear meshes with the outer side of the first transmission gear. The thickness of the first transmission gear is less than the thickness of the second transmission gear. A cam component is coaxially connected to the second transmission gear, and a cam groove is formed on the cam component. A ball bearing is coaxially fixed on the spline sleeve, and a driven roller is provided on the outer ring of the ball bearing. The driven roller extends into the cam groove. When the cam component rotates, the contour of the cam groove pushes the driven roller, thereby causing the spline sleeve to drive the annular support component to reciprocate along its axial direction.

[0009] In the centrifugal oil mist purifier described above, the annular support includes an air guide and heat conduction section. When the annular support rotates and reciprocates along its axial direction, the air guide and heat conduction section forms an axial hot air curtain that blows toward the impeller.

[0010] In the centrifugal oil mist purifier described above, the air guide and heat conduction part is composed of several fins, all of which are arranged along the radial direction of the annular support member, and the several fins are evenly distributed along the circumference of the annular support member.

[0011] In the centrifugal oil mist purifier described above, several of the fins are made of magnetically conductive material, and an electromagnetic coil is installed inside the outer shell. The electromagnetic coil is connected to a high-frequency AC power supply, and the length of the electromagnetic coil covers the reciprocating motion stroke of several of the fins. When the high-frequency AC power supply supplies power to the electromagnetic coil, an alternating magnetic field is generated, and the several fins generate eddy currents and heat up.

[0012] In the centrifugal oil mist purifier described above, an infrared temperature sensor is adapted to be installed in the separation chamber. The detection direction of the infrared temperature sensor is aligned with the surface of the fins. The infrared temperature sensor is used to detect the temperature of the fins. The infrared temperature sensor is connected to an external controller. The controller receives the temperature signal from the infrared temperature sensor and compares it with a preset temperature threshold, thereby controlling the energization or de-energization of the electromagnetic coil.

[0013] In the centrifugal oil mist purifier described above, the preset temperature threshold includes an on threshold and an off threshold. When the real-time temperature received by the controller is higher than the off threshold, the controller controls the electromagnetic coil to be de-energized. When the real-time temperature received by the controller is lower than the on threshold, the controller controls the electromagnetic coil to be energized.

[0014] In the centrifugal oil mist purifier described above, several of the scraping teeth are all in the shape of isosceles triangles.

[0015] In summary, the advantages of this invention compared to the prior art are as follows:

[0016] 1. While the motor drives the impeller to rotate and generate centrifugal force to separate the oil mist, the annular support drives the scraper teeth to rotate and reciprocate along its axis to scrape the inner wall of the separation chamber. While separating the oil mist, the oil stains on the inner wall of the separation chamber are automatically and efficiently cleaned, which can effectively prevent the oil stains from accumulating on the inner wall of the separation chamber.

[0017] 2. The continuously rotating scraper teeth scrape the inner wall of the separation chamber. The oil scraped off by the scraper teeth is guided into the oil guide groove between adjacent scraper teeth. Through the guiding effect of the inclined structure of the oil guide groove and the action of gravity, the oil enters the annular oil collection groove of the annular oil collecting seat. After entering the annular oil collection groove, under the action of centrifugal force and gravity, it quickly converges towards the edge of the annular oil collection groove along the inclined bottom surface, thereby collecting and concentrating the oil.

[0018] 3. Because the annular oil collection seat and the annular support are detachably connected, they are easy to clean and replace, and convenient for later maintenance;

[0019] 4. When the annular support rotates and reciprocates along its axis, several fins made of magnetically conductive material generate eddy currents and heat up under the action of an energized electromagnetic coil, forming an axial hot air curtain that blows toward the impeller, thereby maintaining the surface temperature of the impeller and the cavity wall of the separation chamber, thus effectively preventing oil mist from condensing on the impeller and the cavity wall of the separation chamber.

[0020] 5. The temperature of the fins is controlled by an infrared temperature sensor in conjunction with a controller, thereby controlling the temperature of the axial hot air curtain to avoid overheating and ensure safe operation. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of an embodiment;

[0022] Figure 2 for Figure 1 Enlarged view of part A;

[0023] Figure 3 for Figure 1 Enlarged view of part B;

[0024] Figure 4 for Figure 1 Enlarged view of part C;

[0025] Figure 5 for Figure 1 Enlarged view of part D;

[0026] Figure 6 This is a schematic diagram of the structure of the ring support member in an embodiment.

[0027] Reference numerals: 1. Outer shell; 2. Separation chamber; 3. Oil mist inlet; 4. Oil outlet; 5. Exhaust port; 6. Motor; 7. Impeller; 8. Filter element; 9. Annular support; 10. Scraper teeth; 11. Oil guide groove; 12. Annular oil collection seat; 13. Annular oil collection groove; 14. Planetary gear set; 15. Bracket; 16. Connecting shaft; 17. Transmission gear one; 18. Transmission gear two; 19. Cam component; 20. Cam groove; 21. Driven roller; 22. Fin; 23. Spline sleeve; 24. Electromagnetic coil; 25. Infrared temperature sensor; 26. Ball bearing; 27. Screw; 28. Plug; 29. ​​Mounting plate; 30. Arc-shaped guide strip. Detailed Implementation

[0028] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0029] A centrifugal oil mist purifier, such as Figures 1 to 6As shown, the device includes a housing 1, inside which a separation chamber 2 is provided. The housing 1 is equipped with an oil mist inlet 3, an oil outlet 4, and an exhaust port 5 that communicate with the separation chamber 2. The oil mist inlet 3 is located at the bottom of the housing 1. It should be noted that in the prior art, a filter screen (not shown) is usually installed at the oil mist inlet 3 to block larger impurities from entering with the oil mist. The oil outlet 4 is located on the side wall of the housing 1, and the exhaust port 5 is located at the top of the housing 1. In this embodiment, a screw is threaded into the housing 1, and a plug for sealing the exhaust port 5 is installed on the screw. The screw passes through the exhaust port, and the plug is located on the outside of the housing 1. That is, by rotating the screw, the exhaust port 5 can be opened away from the housing 1 or sealed near the housing 1.

[0030] A motor 6 is installed inside the housing 1. An impeller 7 is coaxially connected to the output end of the motor 6. The motor 6 is located directly above the impeller 7 and can drive the impeller 7 to rotate. A filter element 8 for gas filtration is adapted inside the housing 1. That is, the impeller 7 is driven by the motor 6 to generate centrifugal force to separate the oil mist. The separated gas is filtered again by the filter element 8 and discharged from the exhaust port 5. Moreover, since the filter element 8 is located outside the motor 6, it can effectively reduce the pollution to the motor 6. Furthermore, an arc-shaped guide strip 30 for guiding the oil is provided inside the housing 1. The arc-shaped guide strip 30 is located in the housing 1 corresponding to the filter element 8, and the lowest point of the arc-shaped guide strip 30 is located at the oil outlet 4.

[0031] The output end of motor 6 is connected to an annular support 9, which is located directly below impeller 7. Specifically, the output end of motor 6 is coaxially connected to the sun gear of planetary gear set 14. Supports 15 are connected to the three planet gears of planetary gear set 14, meaning the supports 15 are simultaneously connected to the shaft centers of the three planet gears. A connecting shaft 16 is mounted on the support 15, coaxially with the sun gear of planetary gear set 14. A spline sleeve 23 is coaxially fixed to the annular support 9, through which the connecting shaft 16 passes, and the two are splined together. The spline sleeve 23 is coaxially mounted on... A transmission gear 17 is provided, and a transmission gear 18 meshes with the outer side of the transmission gear 17. The thickness of the transmission gear 17 is less than the thickness of the transmission gear 18. A cam 19 is coaxially connected to the transmission gear 18. A cam groove 20 is provided on the cam 19. A ball bearing 26 is coaxially fixed on the spline sleeve 23. That is, the inner ring of the spline sleeve 23 and the ball bearing 26 are coaxially fixed. A driven roller 21 is provided on the outer ring of the ball bearing 26. The driven roller 21 extends into the cam groove 20. When the cam 19 rotates, the contour of the cam groove 20 pushes the driven roller 21, thereby causing the spline sleeve 23 to drive the annular support 9 to reciprocate along its axial direction.

[0032] It should be noted that, in order to effectively ensure the stability of the rotation and movement of the spline sleeve 23, a bracket is provided inside the outer shell 1, and a guide sleeve is provided on the bracket, through which the spline sleeve 23 moves.

[0033] Specifically, the output of motor 6 drives the sun gear of planetary gear set 14 to rotate. The sun gear of planetary gear set 14 drives the three planet gears of planetary gear set 14 to rotate around the gear ring of planetary gear set 14. The bracket 15 rotates under the drive of the three planet gears of planetary gear set 14. At the same time, the connecting shaft 16 rotates under the drive of bracket 15. The connecting shaft 16 drives the spline sleeve 23 to rotate. The spline sleeve 23 drives the annular support 9, the transmission gear 17, and the inner ring of ball bearing 26 to rotate. The transmission gear 17 drives the transmission gear 18 meshing with it to rotate. The transmission gear 18 drives the cam 19 coaxially connected with it to rotate. As the cam 19 rotates, the driven roller 21 moves along the cam groove 20 of the cam 19. The driven roller 21 drives the ball bearing 26, the spline sleeve 23, and the annular support 9 to move axially back and forth.

[0034] In this embodiment, a single motor 6 can drive the impeller 7 to rotate and generate centrifugal force, drive the annular support 9 to rotate and reciprocate along its axis, which not only effectively reduces the overall cost, but also improves the reliability of the structure and ensures the precise coordination of the action.

[0035] The outer periphery of the annular support member 9 is provided with a plurality of scraping teeth 10. Preferably, the plurality of scraping teeth 10 are all in the shape of isosceles triangles and are evenly distributed along the circumference of the annular support member 9. The plurality of scraping teeth 10 are all made of elastic material and maintain elastic contact with the inner wall of the separation cavity 2. By using scraping teeth 10 with a certain elastic material, the scraping teeth 10 are always in contact with the inner wall of the separation cavity 2, ensuring that the scraping teeth 10 continuously and effectively scrape the inner wall of the separation cavity 2, and can convert hard friction into elastic deformation, thereby reducing frictional resistance and wear.

[0036] It should be noted that the motor 6 drives the annular support 9 to rotate and reciprocate along its axis. That is, the power of the motor 6 causes the annular support 9 to drive the scraper teeth 10 to rotate and scrape the inner wall of the separation chamber 2. At the same time, the annular support 9 reciprocates along its axis, so that the scraper teeth 10 scrape different positions on the inner wall of the separation chamber 2. This realizes that while the motor 6 drives the impeller 7 to rotate and generate centrifugal force for oil mist separation, it can automatically and efficiently clean the oil stains on the inner wall of the separation chamber 2, which can effectively prevent the oil stains from accumulating on the inner wall of the separation chamber 2.

[0037] Furthermore, there is an oil guide groove 11 between two adjacent scraper teeth 10. The bottom surface of the oil guide groove 11 is inclined from the outside to the inside and from top to bottom. That is, the oil is guided towards the central axis of the annular support member 9 through this inclined structure. The lower surface of the annular support member 9 is detachably connected to an annular oil collecting seat 12. In this embodiment, the annular support member 9 and the annular oil collecting seat 12 are connected by bolts (not shown in the figure). Of course, a snap-fit ​​method can also be used. There is no specific limitation. The annular oil collecting seat 12 has an annular oil collecting groove 13. The lowest point of the oil guide groove 11 is located directly above the annular oil collecting groove 13. The bottom surface of the annular oil collecting groove 13 is inclined from the inside to the outside and from top to bottom.

[0038] Specifically, after the scraper teeth 10 scrape off the oil stains adhering to the inner wall of the separation chamber 2, the scraped oil stains are guided into the oil guide groove 11 between adjacent scraper teeth 10, which can effectively prevent oil stains from splashing or re-adhering. The oil stains entering the oil guide groove 11 are guided by the inclined structure of the oil guide groove 11 and gravity into the annular oil collection groove 13 of the annular oil collection seat 12. The oil stains in the annular oil collection groove 13 are rapidly gathered towards the edge of the annular oil collection groove 13 along the inclined bottom surface of the annular oil collection groove 13 by the centrifugal force generated by the rotation of the annular oil collection seat 12 and gravity, thus collecting the oil stains. Since the annular oil collection seat 12 and the annular support 9 are detachably connected, it is only necessary to remove the annular oil collection seat 12 for cleaning and replacement at regular intervals, which is convenient for later maintenance.

[0039] The annular support 9 includes a wind-guiding and heat-conducting part. When the annular support 9 rotates and reciprocates along its axial direction, the wind-guiding and heat-conducting part forms an axial hot air curtain that blows towards the impeller 7. In this embodiment, the wind-guiding and heat-conducting part is composed of several fins 22. Preferably, the several fins 22 are inclined from bottom to top from both sides towards the middle. The several fins 22 are arranged along the radial direction of the annular support 9. The several fins 22 are evenly distributed along the circumference of the annular support 9. The several fins 22 are made of magnetic material. An electromagnetic coil 24 is provided inside the outer shell 1. Preferably, a heat dissipation channel for the electromagnetic coil 24 is opened on the outer wall of the outer shell 1. The electromagnetic coil 24 is connected to a high-frequency AC power supply. The length of the electromagnetic coil 24 covers the reciprocating stroke of the several fins 22. When the high-frequency AC power supply supplies power to the electromagnetic coil 24, an alternating magnetic field is generated, and the several fins 22 generate eddy currents and heat up.

[0040] Specifically, while the motor 6 drives the impeller 7 to rotate and generate centrifugal force for oil mist separation, the annular support 9 also rotates and reciprocates along its axis under the drive of the motor 6. At the same time, the external high-frequency AC power supply connects the electromagnetic coil 24, generating a high-speed changing alternating magnetic field. The magnetic fins 22 moving in this magnetic field are heated due to electromagnetic induction. It should be noted that since several fins 22 are rotating and reciprocating along the axis of the annular support 9, the cooperation of several fins 22 can continuously and evenly agitate the air and heat it, ultimately forming a stable axial hot air curtain that blows towards the impeller 7.

[0041] It should be noted that in the existing technology, oil mist is very easy to condense and accumulate on the surface of the impeller 7 and the inner wall of the separation chamber 2 at low temperature. This not only causes pollution and increases the difficulty of cleaning the surface of the impeller 7 and the inner wall of the separation chamber 2, but more seriously, the condensed oil will increase the resistance to the rotation of the impeller 7. Moreover, when the condensate formed by oil mist is unevenly attached to the impeller 7, it will directly lead to the failure of the dynamic balance of the impeller 7. As the operating time accumulates, the weight distribution of the impeller 7 will become deviated, which will lead to increased vibration of the impeller 7, accelerated bearing wear, and reduced oil mist separation effect due to the influence of centrifugal force.

[0042] In this embodiment, the axial hot air curtain can effectively maintain the surface temperature of the impeller 7 and the wall of the separation chamber 2, effectively preventing oil mist from condensing on the impeller 7 and the wall of the separation chamber 2. Moreover, the increase in ambient temperature can effectively reduce the viscosity of the oil. The low-viscosity oil can be scraped off the surface of the inner wall of the separation chamber 2 more cleanly and efficiently by the scraper teeth 10. This makes the scraper teeth 10 encounter less resistance, and the scraping of the scraper teeth 10 is smoother and more thorough. The low-viscosity oil can flow to the corresponding position by its own gravity and the inclined plane guidance, making the collection of oil easier and reducing the possibility of blockage.

[0043] It should be further explained that, since the reciprocating motion along the axis of the annular support 9 moves closer to or further away from the impeller 7, the axial hot air curtain acting on the impeller 7 will have a stronger effect as the distance decreases or a weaker effect as the distance increases. The effect is the strength and thermal effect of the axial hot air curtain on the impeller 7. When the annular support 9 is located closest to the impeller 7, the axial hot air curtain can not only heat and soften the oil stains on the impeller 7, but also has a certain blowing and drying effect. As the distance increases, the effect weakens. This avoids the situation where the impeller 7 and related components are overheated due to continuous heating, which would lead to performance degradation or even damage. In other words, intermittent heating and cooling are achieved.

[0044] It should be noted that in this embodiment, the motor 6 is mounted on a mounting plate 29 made of heat insulation material. The mounting plate 29 is located directly above the impeller 7. The mounting plate 29 blocks the axial hot air curtain, thereby preventing the axial hot air curtain from directly affecting the motor 6.

[0045] An infrared temperature sensor 25 is adapted inside the separation chamber 2. The detection direction of the infrared temperature sensor 25 is aligned with the surface of the fin 22. The infrared temperature sensor 25 is used to detect the temperature of the fin 22. The infrared temperature sensor 25 is connected to an external controller (not shown). The controller receives the temperature signal from the infrared temperature sensor 25 and compares it with a preset temperature threshold, thereby controlling the energization or de-energization of the electromagnetic coil 24. By automatically controlling the energization or de-energization of the electromagnetic coil 24 based on the preset temperature and the temperature of the fin 22 detected by the infrared temperature sensor 25, overheating is avoided and safe operation is ensured.

[0046] The preset temperature threshold includes an on threshold and an off threshold. Specifically, the controller receives the temperature signal transmitted by the infrared temperature sensor 25 and compares the real-time temperature with the preset temperature threshold. When the real-time temperature received by the controller is higher than the off threshold, the controller controls the electromagnetic coil to turn off the power. When the real-time temperature received by the controller is lower than the on threshold, the controller controls the electromagnetic coil to turn on the power, thereby controlling the temperature of the fins 22 and thus the temperature of the axial hot air curtain, to avoid safety problems caused by overheating.

[0047] The specific embodiments described herein are merely illustrative of the spirit of the invention; those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, but without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A centrifugal oil mist purifier, comprising a housing (1), wherein a separation chamber (2) is provided inside the housing (1), and an oil mist inlet (3), an oil outlet (4), and an exhaust outlet (5) communicating with the separation chamber (2) are adapted on the housing (1), a motor (6) is provided inside the housing (1), and an impeller (7) is coaxially connected to the output end of the motor (6), the motor (6) can drive the impeller (7) to rotate, and a filter element (8) for filtering gas is adapted inside the housing (1), characterized in that: The output end of the motor (6) is connected to an annular support (9), which is located directly below the impeller (7). The annular support (9) has several scraping teeth (10) on its outer periphery, evenly distributed along its circumference. Each scraping tooth (10) is made of elastic material and maintains elastic contact with the inner wall of the separation chamber (2). The motor (6) can drive the annular support (9) to rotate. And reciprocate along its axis, thereby causing the annular support (9) to drive the scraper teeth (10) to scrape the inner wall of the separation chamber (2); there is an oil guide groove (11) between two adjacent scraper teeth (10), the bottom surface of the oil guide groove (11) is inclined from the outside to the inside from top to bottom, the lower surface of the annular support (9) is detachably connected to an annular oil collecting seat (12), the annular oil collecting seat (12) has an annular oil collecting groove (13), the lowest point of the oil guide groove (11) The position is located directly above the annular oil collecting groove (13), and the bottom surface of the annular oil collecting groove (13) is inclined from the inside out and from top to bottom; the annular support member (9) includes a wind-guiding and heat-conducting part. When the annular support member (9) rotates and reciprocates along its axial direction, the wind-guiding and heat-conducting part forms an axial hot air curtain that blows towards the impeller (7); the wind-guiding and heat-conducting part is composed of a number of fins (22), and the number of fins (22) are all arranged along the radial direction of the annular support member (9). The fins (22) are evenly distributed along the circumference of the annular support (9); each of the fins (22) is made of magnetic material, and an electromagnetic coil (24) is provided inside the outer shell (1). The electromagnetic coil (24) is connected to a high-frequency AC power supply. The length of the electromagnetic coil (24) covers the reciprocating stroke of the fins (22). When the high-frequency AC power supply supplies power to the electromagnetic coil (24), an alternating magnetic field is generated, and the fins (22) generate eddy currents and heat up.

2. The centrifugal oil mist purifier according to claim 1, characterized in that: The output end of the motor (6) is coaxially connected to the sun gear of the planetary gear set (14). A bracket (15) is connected to the three planet gears of the planetary gear set (14). A connecting shaft (16) is provided on the bracket (15). The connecting shaft (16) is coaxially arranged with the sun gear of the planetary gear set (14). A spline sleeve (23) is coaxially fixed on the annular support (9). The connecting shaft (16) and the spline sleeve (23) are splined together.

3. A centrifugal oil mist purifier according to claim 2, characterized in that: A transmission gear 1 (17) is coaxially arranged on the spline sleeve (23). A transmission gear 2 (18) meshes with the outer side of the transmission gear 1 (17). The thickness of the transmission gear 1 (17) is less than the thickness of the transmission gear 2 (18). A cam element (19) is coaxially connected to the transmission gear 2 (18). A cam groove (20) is provided on the cam element (19). A ball bearing (26) is coaxially fixed on the spline sleeve (23). A driven roller (21) is provided on the outer ring of the ball bearing (26). The driven roller (21) extends into the cam groove (20). When the cam element (19) rotates, the contour of the cam groove (20) pushes the driven roller (21), thereby causing the spline sleeve (23) to drive the annular support (9) to reciprocate along its axial direction.

4. A centrifugal oil mist purifier according to claim 3, characterized in that: An infrared temperature sensor (25) is adapted to be installed in the separation chamber (2). The detection direction of the infrared temperature sensor (25) is aligned with the surface of the fin (22). The infrared temperature sensor (25) is used to detect the temperature of the fin (22). The infrared temperature sensor (25) is connected to an external controller. The controller receives the temperature signal from the infrared temperature sensor (25) and compares it with a preset temperature threshold, thereby controlling the energization or de-energization of the electromagnetic coil (24).

5. A centrifugal oil mist purifier according to claim 4, characterized in that: The preset temperature thresholds include an on threshold and an off threshold. When the real-time temperature received by the controller is higher than the off threshold, the controller controls the electromagnetic coil (24) to be de-energized. When the real-time temperature received by the controller is lower than the on threshold, the controller controls the electromagnetic coil (24) to be energized.

6. A centrifugal oil mist purifier according to claim 5, characterized in that: Several of the scraping teeth (10) are all isosceles triangles.

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