An oil fume purification device of a microwave plasma torch

Abstract

The application discloses a kind of oil fume purification device of microwave plasma torch, including purification box and microwave plasma torch, one side of the purification box is equipped with mixing box, one end of the mixing box is equipped with oil fume pipeline, the other end is equipped with air pipeline, the outer periphery of the mixing box is sealingly connected with mixing cover, the inside of the mixing cover is equipped with the mixing fan for mixing oil fume and air together, the air pipeline is connected with normal temperature air pipeline and hot air pipeline by temperature control box, the inside of the temperature control box is equipped with the adjusting valve for adjusting air temperature, the adjusting valve is controlled to operate by trigger mechanism.The application can fully mix oil fume and air by mixing box, mixing cover and mixing fan, temperature control spring can perceive temperature, when temperature exceeds setting parameter, trigger mechanism drives adjusting valve to rotate to adjust temperature in temperature control box, so that oil fume temperature can always be kept in reasonable interval, to ensure purification efficiency.

Description

Technical Field

[0001] This invention relates to the field of oil fume purification technology, specifically to an oil fume purification device using a microwave plasma torch. Background Technology

[0002] A microwave plasma torch (MPT) is a device that uses microwave energy to excite gas and generate high-temperature, highly reactive plasma. Its core feature is the ability to produce plasma regions rich in electrons, ions, and free radicals (such as ·OH, ·O, ·N, etc.) at normal or low pressure. When applied to oil fume purification, it utilizes the strong oxidizing properties and energy transfer characteristics of plasma to achieve efficient decomposition and removal of pollutants in oil fumes. Oil fumes are mixed pollutants generated during cooking, food processing, or industrial production (such as metal rolling and oil processing). Traditional purification technologies (such as electrostatic separation, activated carbon adsorption, and filtration) suffer from low efficiency, frequent replacement of consumables, and the potential for secondary pollution. However, the microwave plasma torch, with its highly reactive plasma, can achieve "one-stop" decomposition of these pollutants, requiring no consumables, and producing mostly harmless CO2 and H2O as byproducts.

[0003] Chinese invention patent CN105664631B discloses a microwave plasma torch-based oil fume purification device. This device mixes oil fumes and air inside a purification chamber, using a microwave plasma torch array within the chamber to generate a stable high-temperature plasma region, thus purifying the oil fumes. The invention can automatically adjust the power distribution of the plasma torch array based on the flow rate and concentration of the oil fume, improving processing efficiency and energy utilization. It also adjusts the air supply based on the residual oxygen content detected in the exhaust pipe after purification, ensuring sufficient oxidation of organic pollutants in the oil fumes and guaranteeing a high purification rate. Regarding the aforementioned technologies, the inventors believe that the following defects exist: Oil fumes and air are directly discharged into the purification chamber through the oil fume inlet pipe and air inlet pipe, and then purified by the microwave plasma torch. Therefore, the oil fumes and air are not uniformly mixed before purification, which affects the purification effect, especially the degradation of VOCs and odors. Furthermore, unmixed oil mist may condense at the pipes or plasma torch inlet, adhering to the electrodes or microwave generator surface, affecting equipment stability. Additionally, oil fumes at a certain temperature mixed with room temperature air will produce oil and water that adheres to the inner wall of the equipment, affecting its operation over time and making cleaning difficult. The mixing of room temperature air with oil fumes lowers the temperature of the oil fumes, which also affects purification efficiency. Therefore, we propose an oil fume purification device using a microwave plasma torch. Summary of the Invention

[0004] The purpose of this invention is to provide a microwave plasma torch for purifying oil fumes, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an oil fume purification device for a microwave plasma torch, comprising a purification box, wherein a microwave plasma torch for purifying oil fumes is provided inside the purification box, a mixing box for mixing oil fumes and air is provided on one side of the purification box, an oil fume duct for introducing oil fumes is provided at one end of the mixing box, and an air duct for introducing air is provided at the other end, a mixing cover is sealed to the outer periphery of the mixing box, and the mixing cover is fitted in the middle of the mixing box, and a mixing fan for mixing oil fumes and air is provided inside the mixing cover, the mixing fan being rotatably installed inside the mixing cover via a rotating assembly;

[0006] The bottom of the mixing hood is equipped with an oil fume chamber, which is connected to the purification box through an oil fume duct;

[0007] In this process, oil fumes enter the mixing chamber through an oil fume duct, and air enters the mixing chamber through an air duct. The oil fumes and air are fully mixed by a mixing fan and then transported to the microwave plasma torch for purification through an exhaust duct.

[0008] The air duct is connected to a normal temperature air duct and a hot air duct via a temperature control box. The temperature control box is equipped with a regulating valve for adjusting the air temperature, and the regulating valve is controlled by a triggering mechanism.

[0009] In this process, ambient temperature air enters the temperature control box through an ambient temperature air pipe, while hot air enters the temperature control box through a hot air pipe. After the ambient temperature air and hot air are mixed and regulated in the temperature control box, they are then transported into the mixing box by an air pump.

[0010] Preferably, the regulating valve has a fan-shaped structure and is located between the angle between the ambient air duct and the hot air duct;

[0011] The regulating valve is rotatably mounted inside the temperature control box via a rotating shaft;

[0012] The temperature control box has a circular structure, and the fan-shaped arc surface of the regulating valve is tangent to the inner diameter of the temperature control box and is sealed.

[0013] Preferably, the triggering mechanism includes a trigger box connected to the end of the exhaust duct. The trigger box is equipped with a temperature control spring that can expand or retract according to temperature changes. One end of the temperature control spring is fixed to the bottom of the inner side of the trigger box, and the other end is in a free state.

[0014] The upper end of the temperature control spring is fixedly connected to a lifting rod, and the lifting rod is slidably connected to the upper end of the trigger box. The upper end of the lifting rod is provided with a rack, which is located outside the trigger box. The upper end of the temperature control box is provided with a fixing plate, and a gear is rotatably installed on the fixing plate. The gear meshes with the rack.

[0015] The gear is connected to a synchronous pulley via a rotating shaft, and the regulating valve is also connected to a synchronous pulley via a rotating shaft. The two synchronous pulleys are connected by a synchronous belt drive.

[0016] Preferably, the mixing box has a partition in the middle of its inner side for isolating oil fumes and air, and a guide cone is provided on both sides of the partition. The guide cone has a conical structure and its top end is inserted into the oil fume duct and the air duct, respectively.

[0017] The mixing chamber has conical structures at both ends that match the shape of the guide cone.

[0018] Preferably, the surface of the mixing box is provided with two sets of vents for connecting the mixing box and the mixing hood, and the two sets of vents are located on both sides of the partition.

[0019] Preferably, the rotating assembly includes a fixed disk fixed to the inner side wall of the mixing hood, a plurality of balls are rotatably mounted on one side of the fixed disk, and a circular disk is fixedly mounted on one side of the mixing fan, with a circular groove on one side of the circular disk, and the circular groove is in rolling connection with the balls.

[0020] The rotating assembly is provided in two sets, which are respectively installed on both sides of the mixing fan.

[0021] Preferably, the surface of the microwave plasma torch is provided with a heat exchanger for absorbing the heat of the microwave plasma torch, and the end of the hot air pipe is provided with a hot air pipe inlet. Room temperature air enters the heat exchanger through the hot air pipe inlet, is heated, and then transported into the hot air pipe.

[0022] Preferably, the fume duct is equipped with a fume flow meter and a fume concentration meter;

[0023] An air flow meter is installed on the air duct, and the oil fume flow meter, oil fume concentration meter, air flow meter, and air pump are all electrically connected to the control system.

[0024] Preferably, the purification box has an oil fume inlet on one side for conveying oil fumes into the microwave plasma torch and an exhaust outlet on the other side for discharging purified oil fumes. The oil fume inlet is connected to the trigger box.

[0025] Preferably, the temperature control spring has a wavy structure.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] In this invention, oil fumes enter the mixing chamber through an oil fume duct, and air enters the mixing chamber through an air duct. Then, they enter the mixing hood through two sets of vents. The oil fumes and air entering the mixing hood are blown onto the blades of the mixing fan, causing the mixing fan to rotate. This ensures that the oil fumes and air are thoroughly mixed within the mixing hood, resulting in a uniform mixture that guarantees the purification efficiency of the microwave plasma torch. The rotating mixing fan guides the mixed gas of oil fumes and air inside the mixing hood to the oil fume exhaust chamber, and then discharges it into the purification chamber through the oil fume exhaust duct. The oil fumes are then purified by the microwave plasma torch, and finally discharged through the exhaust port, completing the oil fume purification process.

[0028] The regulating valve inside the temperature control box is used to regulate the intake volume of hot air and ambient air. If the temperature of the oil fume mixture entering the purification box is high, the intake volume of hot air is reduced and the intake volume of ambient air is increased. If the temperature of the oil fume mixture entering the purification box is low, the intake volume of hot air is increased and the intake volume of ambient air is reduced, thereby ensuring that the temperature of the oil fume mixture entering the purification box is within a reasonable range.

[0029] The temperature control spring can sense temperature. When the temperature is too high, the wave-shaped temperature control spring will deform and expand to a certain size, causing the regulating valve to rotate towards the hot air duct. This reduces the intake of hot air and increases the intake of room temperature air, thus lowering the temperature of the air entering the mixing chamber and consequently lowering the temperature of the mixture of oil fumes and air. When the temperature sensed by the temperature control spring is lower than the set parameter, the temperature control spring will contract to a certain size, causing the regulating valve to reverse at a certain angle. This increases the temperature of the mixture of oil fumes and air, ensuring that the temperature of the mixture is always maintained within a reasonable range, thereby guaranteeing the purification efficiency of the microwave plasma torch. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a cross-sectional view of the overall structure of the present invention;

[0032] Figure 3 This is a schematic diagram of part of the structure of the present invention and the internal structure of the mixing hood;

[0033] Figure 4 This is a partial structural cross-sectional view of the present invention;

[0034] Figure 5 For the present invention Figure 4 Detailed enlarged view of the rotating component at point A;

[0035] Figure 6 This is a schematic diagram of the mixing box structure of the present invention;

[0036] Figure 7 This is a schematic diagram of the hybrid fan structure of the present invention.

[0037] In the diagram: 1. Purification box; 11. Fume inlet; 12. Exhaust outlet; 2. Microwave plasma torch; 3. Mixing box; 31. Fume duct; 32. Air duct; 33. Mixing hood; 34. Mixing fan; 35. Baffle; 36. Guide cone; 37. Vent; 38. Fume exhaust chamber; 39. Fume exhaust duct; 310. Fume flow meter; 311. Fume concentration meter; 312. Air flow meter; 4. Rotating... Components; 41. Fixed plate; 42. Rotating ball; 43. Circular disc; 44. Circular groove; 5. Temperature control box; 51. Normal temperature air duct; 52. Hot air duct; 53. Air pump; 54. Hot air duct inlet; 6. Regulating valve; 7. Trigger mechanism; 71. Trigger box; 72. Temperature control spring; 73. Lifting rod; 74. Rack; 75. Fixed plate; 76. Gear; 77. Synchronous pulley; 78. Synchronous belt; 8. Heat exchanger. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figure 1-7This invention provides a technical solution: a microwave plasma torch for purifying oil fumes, comprising a purification chamber 1, inside which is a microwave plasma torch 2 for purifying oil fumes. One side of the purification chamber 1 has an oil fume inlet 11 for conveying oil fumes into the microwave plasma torch 2, and the other side has an exhaust outlet 12 for discharging the purified oil fumes. One side of the purification chamber 1 has a mixing chamber 3 for mixing oil fumes and air. One end of the mixing chamber 3 has an oil fume duct 31 for introducing oil fumes, and the other end has an air duct 32 for introducing air. The inner center of the mixing chamber 3 has a partition 35 for isolating oil fumes and air. Each side of the partition 35 has a guide cone 36. It has a conical structure, with its top end inserted into the oil fume duct 31 and air duct 32 respectively. The two ends of the mixing box 3 are provided with conical structures that match the shape of the guide cone 36. The outer periphery of the mixing box 3 is sealed with a mixing cover 33, and the mixing cover 33 is fitted in the middle of the mixing box 3. The surface of the mixing box 3 is provided with two sets of vent holes 37 for connecting the mixing box 3 and the mixing cover 33. The two sets of vent holes 37 are located on both sides of the partition 35. The mixing cover 33 is provided with a mixing fan 34 for mixing oil fumes and air together. The mixing fan 34 is rotatably installed inside the mixing cover 33 through the rotating component 4. The bottom of the mixing cover 33 is provided with an oil fume chamber 38, and the oil fume chamber 38 is connected to the purification box 1 through an oil fume duct 39.

[0040] Oil fumes enter the mixing chamber 3 through the oil fume duct 31, and air enters the mixing chamber 3 through the air duct 32. The oil fumes and air are fully mixed by the mixing fan 34 and then transported to the microwave plasma torch 2 through the oil fume exhaust duct 39 for purification.

[0041] The fume duct 31 is equipped with a fume flow detector 310 and a fume concentration detector 311, and the air duct 32 is equipped with an air flow detector 312. The fume flow detector 310, the fume concentration detector 311, the air flow detector 312, and the air pump 53 are all electrically connected to the control system.

[0042] Generally, to ensure sufficient oxidation of organic matter in cooking fumes, adequate oxygen is required. This necessitates the introduction of excess air to mix with the fumes. Fume flow rate detector 310 and fume concentration detector 311 are used to detect the flow rate and concentration of the fumes. The control system calculates the minimum amount of air needed to maintain an oxygen-rich environment and ensure sufficient oxidation of organic matter in the fumes. During operation, cooking fumes enter the mixing chamber 3 through the fume duct 31, and air enters the mixing chamber 3 through the air duct 32. The fumes and air are guided by the flow guide cone 36, causing them to flow towards the inner walls of the mixing chamber 3 on both sides of the partition 35, and then... The fumes and air enter the mixing hood 33 through the two sets of ventilation holes 37. The fumes and air entering the mixing hood 33 will be blown onto the blades of the mixing fan 34, causing the mixing fan 34 to rotate. This allows the fumes and air to be fully mixed inside the mixing hood 33, ensuring a uniform mixture and guaranteeing the purification efficiency of the microwave plasma torch 2. The rotation of the mixing fan 34 guides the mixed gas of fumes and air inside the mixing hood 33 to the fume exhaust chamber 38, and then discharges it into the purification box 1 through the fume exhaust pipe 39. The fume is then purified by the microwave plasma torch 2, and after purification, it is discharged through the exhaust port 12, completing the purification of the fumes.

[0043] Air duct 32 is connected to ambient air duct 51 and hot air duct 52 through temperature control box 5. Temperature control box 5 is equipped with regulating valve 6 for regulating air temperature. Regulating valve 6 is controlled by triggering mechanism 7.

[0044] The surface of the microwave plasma torch 2 is provided with a heat exchanger 8 for absorbing the heat of the microwave plasma torch 2. The end of the hot air pipe 52 is provided with a hot air pipe inlet 54. Room temperature air enters the heat exchanger 8 through the hot air pipe inlet 54, is heated and then transported into the hot air pipe 52.

[0045] The microwave plasma torch 2 generates high temperatures during operation. A heat exchanger 8 collects this heat to heat the air, ensuring the air-fume mixture remains within a specific temperature range, thus improving fume purification efficiency. A room-temperature air duct 51 regulates the air temperature to prevent overheating. Air enters the heat exchanger 8 through the hot air duct inlet 54, is heated, and then enters the hot air duct 52 before flowing into the temperature control box 5. Room-temperature air enters the temperature control box 5 through the room-temperature air duct 51, where the room-temperature and hot air are mixed and regulated. After being heated, the oil fume mixture is pumped into the mixing chamber 3 by the air pump 53 and mixed again with the oil fume. Then it is sent into the purification chamber 1 for purification. The regulating valve 6 inside the temperature control chamber 5 is used to regulate the intake volume of hot air and room temperature air. The regulating valve 6 is driven by the triggering mechanism 7. If the temperature of the oil fume mixture entering the purification chamber 1 is high, the intake volume of hot air is reduced and the intake volume of room temperature air is increased. If the temperature of the oil fume mixture entering the purification chamber 1 is low, the intake volume of hot air is increased and the intake volume of room temperature air is reduced, so as to ensure that the temperature of the oil fume mixture entering the purification chamber 1 is within a reasonable range.

[0046] The regulating valve 6 has a sector-shaped structure and is located between the angle between the ambient air pipe 51 and the hot air pipe 52. The regulating valve 6 is rotatably installed inside the temperature control box 5 via a rotating shaft. The temperature control box 5 has a circular structure, and the sector-shaped arc surface of the regulating valve 6 is tangent to the inner diameter of the temperature control box 5 and is sealed.

[0047] The triggering mechanism 7 includes a trigger box 71 connected to the end of the exhaust duct 39. Inside the trigger box 71 is a temperature control spring 72 that can expand or retract according to temperature changes. The temperature control spring 72 has a wave-shaped structure. One end of the temperature control spring 72 is fixed to the bottom of the inner side of the trigger box 71, and the other end is in a free state. A lifting rod 73 is fixedly connected to the upper end of the temperature control spring 72, and the lifting rod 73 is slidably connected to the upper end of the trigger box 71. A rack 74 is provided at the upper end of the lifting rod 73. The rack 74 is located outside the trigger box 71. A fixing plate 75 is provided at the upper end of the temperature control box 5. A gear 76 is rotatably mounted on the fixing plate 75. The gear 76 is meshed with the rack 74. The gear 76 is connected to a synchronous pulley 77 through a rotating shaft. The regulating valve 6 is also connected to the synchronous pulley 77 through a rotating shaft. The two synchronous pulleys 77 are connected by a synchronous belt 78.

[0048] During operation, the mixture of oil fumes and air enters the trigger box 71 through the exhaust duct 39 and is blown towards the temperature control spring 72. The temperature control spring 72 can sense the temperature. When the temperature is too high, the wave-shaped temperature control spring 72 will deform and expand to a certain size, then lift the lifting rod 73 to rise, causing the rack 74 at the upper end of the lifting rod 73 to rise, causing the gear 76 to rotate. Through the transmission of two synchronous pulleys 77 and synchronous belt 78, the regulating valve 6 rotates towards the hot air duct 52, reducing the air intake of the hot air duct 52 and increasing the air intake of room temperature air. Therefore, the air temperature entering the mixing box 3 becomes lower, and the temperature of the mixture of oil fumes and air also becomes lower. When the temperature sensed by the temperature control spring 72 is lower than the set parameter, the temperature control spring 72 contracts to a certain size, causing the lifting rod 73 to fall, and causing the regulating valve 6 to reverse a certain angle, which can increase the temperature of the mixture of oil fumes and air, so that the temperature of the mixture of oil fumes and air can always be kept within a reasonable range, thereby ensuring the purification efficiency of the microwave plasma torch 2.

[0049] The rotating assembly 4 includes a fixed disk 41 fixed on the inner side wall of the mixing hood 33. Several balls 42 are rotatably mounted on one side of the fixed disk 41. A circular disk 43 is fixedly mounted on one side of the mixing fan 34. A circular groove 44 is provided on one side of the circular disk 43. The circular groove 44 is rotatably connected to the balls 42. The rotating assembly 4 has two sets, which are respectively installed on both sides of the mixing fan 34.

[0050] The mixing fan 34 is mounted on the inner walls of the mixing hood 33 on both sides via rotating components 4 on both sides. When oil fumes and air are blown toward the blades of the mixing fan 34 through the vent 37, the mixing fan 34 can rotate via the ball bearings 42 on both sides, thereby discharging the oil fumes inside the mixing hood 33 into the lower oil fume chamber 38.

[0051] The working principle and usage process of this invention: When the microwave plasma torch 2 is working, it generates high temperatures. A heat exchanger 8 collects the heat from the microwave plasma torch 2 to heat the air. The air enters the heat exchanger 8 through the hot air inlet 54, is heated, and then enters the hot air pipe 52, and then the temperature control box 5. Room temperature air enters the temperature control box 5 through the room temperature air pipe 51. The room temperature air and hot air are mixed and temperature-adjusted in the temperature control box 5, and then pumped into the mixing box 3 by the air pump 53. Oil fumes enter the mixing box 3 through the oil fume pipe 31. The oil fumes and air are guided by the guide cone 36, causing them to flow towards the inner walls of the mixing box 3 on both sides of the partition 35, and then enter the mixing hood 33 through two sets of vents 37. The air blown into the mixing fan 34 causes the mixing fan 34 to rotate, allowing the oil fumes and air to mix thoroughly within the mixing hood 33. This ensures a uniform mixture of oil fumes and air, guaranteeing the purification efficiency of the microwave plasma torch 2. The oil fume flow detector 310 and oil fume concentration detector 311 are used to detect the flow rate and concentration of oil fumes. The control system can calculate the minimum amount of air required to maintain an oxygen-rich environment, ensuring that the organic matter in the oil fumes is fully oxidized. The rotation of the mixing fan 34 guides the mixed gas of oil fumes and air inside the mixing hood 33 to the exhaust chamber 38, and then discharges it into the purification box 1 through the exhaust pipe 39. The oil fumes are then purified by the microwave plasma torch 2, and finally discharged through the exhaust port 12, completing the purification of the oil fumes.

[0052] During operation, the mixture of oil fumes and air enters the trigger box 71 through the exhaust duct 39 and is blown towards the temperature control spring 72. The temperature control spring 72 can sense the temperature. When the temperature is too high, the wave-shaped temperature control spring 72 will deform and expand to a certain size, then lift the lifting rod 73 to rise, causing the rack 74 at the upper end of the lifting rod 73 to rise, causing the gear 76 to rotate. Through the transmission of the two synchronous pulleys 77 and the synchronous belt 78, the regulating valve 6 rotates towards the hot air duct 52, reducing the air intake of the hot air duct 52 and increasing the air intake of room temperature air. Therefore, the air temperature entering the mixing box 3 becomes lower, and the temperature of the mixture of oil fumes and air also becomes lower. When the temperature sensed by the temperature control spring 72 is lower than the set parameter, the temperature control spring 72 contracts to a certain size, causing the lifting rod 73 to fall, and causing the regulating valve 6 to reverse a certain angle, which can increase the temperature of the mixture of oil fumes and air, so that the temperature of the mixture of oil fumes and air can always be kept within a reasonable range, thereby ensuring the purification efficiency of the microwave plasma torch 2.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A microwave plasma torch for purifying oil fumes, comprising a purification chamber (1), wherein the purification chamber (1) is provided with a microwave plasma torch (2) for purifying oil fumes, characterized in that: The purification box (1) has a mixing box (3) for mixing oil fumes and air on one side. The mixing box (3) has an oil fume duct (31) for introducing oil fumes at one end and an air duct (32) for introducing air at the other end. The mixing box (3) is sealed with a mixing cover (33) on its outer periphery, and the mixing cover (33) is fitted in the middle of the mixing box (3). The mixing cover (33) has a mixing fan (34) for mixing oil fumes and air inside, and the mixing fan (34) is rotatably installed inside the mixing cover (33) by a rotating component (4). The bottom of the mixing hood (33) is provided with an oil fume chamber (38), which is connected to the purification box (1) through an oil fume duct (39); Among them, the oil fumes enter the mixing box (3) through the oil fume duct (31), and the air enters the mixing box (3) through the air duct (32). The oil fumes and air are fully mixed by the mixing fan (34) and then transported to the microwave plasma torch (2) for purification through the oil fume exhaust duct (39). The air duct (32) is connected to a normal temperature air duct (51) and a hot air duct (52) through a temperature control box (5). The temperature control box (5) is equipped with a regulating valve (6) for adjusting the air temperature. The regulating valve (6) is controlled by a triggering mechanism (7). Among them, ambient air enters the temperature control box (5) through ambient air pipe (51), and hot air enters the temperature control box (5) through hot air pipe (52). After the ambient air and hot air enter the temperature control box (5) and are mixed and regulated, they are transported into the mixing box (3) through air pump (53). The triggering mechanism (7) includes a trigger box (71) connected to the end of the exhaust duct (39). The trigger box (71) is equipped with a temperature control spring (72) that can be expanded or retracted according to temperature changes. One end of the temperature control spring (72) is fixed to the bottom of the inner side of the trigger box (71), and the other end is in a free state. The upper end of the temperature control spring (72) is fixedly connected to a lifting rod (73), and the lifting rod (73) is slidably connected to the upper end of the trigger box (71). The upper end of the lifting rod (73) is provided with a rack (74), which is located outside the trigger box (71). The upper end of the temperature control box (5) is provided with a fixing plate (75), and a gear (76) is rotatably installed on the fixing plate (75). The gear (76) meshes with the rack (74). The gear (76) is connected to a synchronous pulley (77) via a rotating shaft, and the regulating valve (6) is also connected to a synchronous pulley (77) via a rotating shaft. The two synchronous pulleys (77) are connected by a synchronous belt (78). The surface of the mixing box (3) is provided with two sets of vent holes (37) for connecting the mixing box (3) and the mixing cover (33), and the two sets of vent holes (37) are located on both sides of the partition (35); The rotating assembly (4) includes a fixed disk (41) fixed on the inner side wall of the mixing hood (33). A plurality of balls (42) are rotatably mounted on one side of the fixed disk (41). A circular disk (43) is fixedly mounted on one side of the mixing fan (34). A circular groove (44) is provided on one side of the circular disk (43). The circular groove (44) is in rolling connection with the balls (42). The rotating assembly (4) is provided in two sets, which are respectively installed on both sides of the mixing fan (34).

2. The oil fume purification device of the microwave plasma torch according to claim 1, characterized in that: The regulating valve (6) has a fan-shaped structure and is located between the angle between the ambient air pipe (51) and the hot air pipe (52); The regulating valve (6) is rotatably installed inside the temperature control box (5) via a rotating shaft; The temperature control box (5) has a circular structure, and the fan-shaped arc surface of the regulating valve (6) is tangent to the inner diameter of the temperature control box (5) and is sealed.

3. The oil fume purification device of the microwave plasma torch according to claim 1, characterized in that: The mixing box (3) has a partition (35) in the middle of its inner side for isolating oil fumes and air. A guide cone (36) is provided on both sides of the partition (35). The guide cone (36) is a cone-shaped structure, and its top end is inserted into the oil fume pipe (31) and the air pipe (32) respectively. The mixing box (3) has conical structures at both ends that match the shape of the guide cone (36).

4. The oil fume purification device of the microwave plasma torch according to claim 1, characterized in that: The surface of the microwave plasma torch (2) is provided with a heat exchanger (8) for absorbing the heat of the microwave plasma torch (2). The end of the hot air pipe (52) is provided with a hot air pipe inlet (54). Room temperature air enters the heat exchanger (8) through the hot air pipe inlet (54), is heated and then transported into the hot air pipe (52).

5. The oil fume purification device of a microwave plasma torch according to claim 1, characterized in that: The fume duct (31) is equipped with a fume flow meter (310) and a fume concentration meter (311). An air flow meter (312) is installed on the air duct (32). The oil fume flow meter (310), oil fume concentration meter (311), air flow meter (312) and air pump (53) are all electrically connected to the control system.

6. The oil fume purification device of the microwave plasma torch according to claim 1, characterized in that: The purification box (1) has an oil fume inlet (11) on one side for conveying oil fumes into the microwave plasma torch (2) and an exhaust outlet (12) on the other side for discharging purified oil fumes. The oil fume inlet (11) is connected to the trigger box (71).

7. The oil fume purification device of the microwave plasma torch according to claim 1, characterized in that: The temperature control spring (72) has a wave-shaped structure.

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