An automatic control system for fans

Abstract

This invention relates to an automatic fan control system, comprising a fume extraction fan for drawing and expelling cooking fumes generated by a stove, a makeup air fan, a differential pressure sensor, a purifier, and fume control equipment. The makeup air fan is located outdoors. The inlet end of the purifier is connected to a duct, and the stove, purifier, and fume extraction fan are connected via ducts. A methane sensor is installed on one side of the stove. A first fume sensor and a temperature sensor are installed on the duct at the inlet side of the purifier, and a second fume sensor is installed on the duct at the outlet side of the fume extraction fan. The fume control equipment is connected to the stove, purifier, fume extraction fan, first fume sensor, temperature sensor, second fume sensor, makeup air fan, differential pressure sensor, and methane sensor, respectively. The fume control equipment is also connected to a terminal signal. This automatic fan control system can automatically adjust the fan speed and power based on real-time fume concentration detection data to achieve energy-saving operation while ensuring effective fume removal.

Description

Technical Field

[0001] This invention relates to the field of fume extraction, specifically to an automatic control system for a fan. Background Technology

[0002] Commercial kitchen fume extraction systems are typically divided into two parts: one is the make-up air for the kitchen work area, and the other is the exhaust of kitchen fumes. In the make-up air section, the air volume of the make-up air fan is usually required to be more than 70% of that of the exhaust fan. In most usage scenarios, the make-up air fan operates at full load, resulting in a significant waste of resources. In the exhaust section, the exhaust fan is usually designed with the maximum air volume required based on the number and length of the stoves, so the fan power is selected based on the maximum air volume and power. During kitchen operations, regardless of how many stoves are turned on or how much fumes are produced, the fan will operate at maximum power, which also results in a significant waste of resources. Currently, the most common energy-saving method for exhaust systems on the market is to adjust the operation based on the number of stoves turned on. This method fixes the operating frequency according to the number of stoves turned on. However, when all stoves are turned on or a large number of stoves are operating, this method still causes the fan to operate at a high load, resulting in limited energy-saving effect. In view of this, we propose an automatic fan control system. Summary of the Invention

[0003] The purpose of this invention is to provide an automatic fan control system to solve the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: an automatic fan control system, comprising an oil fume fan for extracting and discharging oil fumes generated by a stove, and further comprising a make-up air fan, a differential pressure sensor, a purifier, and an oil fume control device. The make-up air fan is installed outdoors, the inlet end of the purifier is connected to a duct, and the stove, the purifier, and the oil fume fan are connected through a duct. A methane sensor is installed on one side of the stove.

[0004] The purifier is equipped with an oil fume sensor and a temperature sensor on the inlet side pipe, and an oil fume sensor is equipped with an oil fume sensor on the outlet side pipe of the oil fume fan. The oil fume control device is connected to the stove, purifier, oil fume fan, oil fume sensor, temperature sensor, oil fume sensor, make-up air fan, differential pressure sensor and methane sensor respectively. The oil fume control device is connected to the terminal signal.

[0005] Preferably, the purifier includes a filter box and a mixing box. The mixing box is fixed on the base, and a stand and a collection box are fixed on the base. The bottom of the filter box is connected to the collection box through a drain pipe, and the filter box is fixed on the stand. A cross brace is fixed at the top of the stand, and a detergent box and a diluent box are fixed on the cross brace.

[0006] Preferably, a conical filter cylinder is installed inside the filtration chamber, and the upper end of the conical filter cylinder is coaxially fixed to a ring frame and fixed to the inner wall of the filtration chamber through the ring frame. A sealing plate is fixed to the lower end of the conical filter cylinder, and the air inlet end of the filtration chamber is located on the lower side of the ring frame and connected to a pipe. The air outlet end of the filtration chamber is located on the upper side of the ring frame and connected to a pipe. A spiral tube is sleeved on the pipe at the air inlet end of the filtration chamber. The spiral tube is fixed on the upright frame, and the outlet end of the spiral tube is connected to the bottom of the mixing chamber.

[0007] Preferably, a tube shaft is rotatably connected through the bottom of the filtration box, and the tube shaft and the conical filter cylinder share the same central axis. The tube shaft is connected to the motor through a bevel gear set, and the motor is fixed on the upright frame.

[0008] Preferably, a support arm is fixed to the upper end of the tube shaft, and a brush roller is rotatably connected to the support arm. The rotating shaft of the brush roller is hollow inside, and multiple small holes are opened on the side wall. A cap is provided on the support arm. The cap is connected to the inside of the tube shaft through a conduit. The cap is fitted and rotatably connected to the end of the rotating shaft. A gear two is coaxially fixed to the end of the rotating shaft away from the cap. A gear ring two is fixed to the inner wall of the filter box. The gear two meshes with the gear ring two.

[0009] Preferably, a column is fixed to the bottom surface of the mixing chamber, the lower end of the tube shaft is open, and the lower end of the tube shaft penetrates the top wall of the mixing chamber and extends into the interior of the column shaft. A spiral blade is fixed on a section of the peripheral wall inside the column shaft.

[0010] Preferably, a cantilever is fixed on the side wall inside the mixing chamber, and a stirring shaft is rotatably connected to the cantilever. A gear is coaxially fixedly connected to the upper end of the stirring shaft. A gear ring is fixed on the inner wall of the mixing chamber, and the gear and gear ring mesh with each other.

[0011] Preferably, a shaft is connected through and pivotally rotated on the top wall of the filtration chamber. The upper end of the shaft is coaxially fixedly connected to a friction disc, and the lower end passes through a sealing plate and is coaxially fixedly connected to the upper end of the tube shaft.

[0012] Preferably, pump wheel one and pump wheel two are fixed on the upper surface of the filter box. Pump wheel one and pump wheel two are symmetrically arranged on both sides of the friction disc. Water pipe one is fixed and connected to the peripheral wall of pump wheel one. The inlet end of water pipe one is connected to the desiccant tank, and the outlet end is connected to the inlet end of the spiral tube. Water pipe two is fixed and connected to the peripheral wall of pump wheel two. The inlet end of water pipe two is connected to the diluent tank, and the outlet end is connected to the inlet end of the spiral tube.

[0013] Preferably, the outer walls of pump wheel one and pump wheel two are respectively fixedly connected to the two ends of the slide rod, and the slide rod is set perpendicular to the shaft. A sliding sleeve is sleeved and slidably connected on the slide rod. A polygonal rod one and a polygonal rod two are rotatably connected to the sliding sleeve. Friction wheel one and friction wheel two are respectively coaxially fixedly connected on polygonal rod one and polygonal rod two. The friction wheel one and friction wheel two are located on both sides of the central axis of the friction disc. Polygonal rod one and polygonal rod two are both set perpendicular to the shaft. A matching sleeve one is sleeved and slidably connected on polygonal rod one, and sleeve one is coaxially fixedly connected to the impeller shaft of pump wheel one. A matching sleeve two is sleeved and slidably connected on polygonal rod two, and sleeve two is coaxially fixedly connected to the impeller shaft of pump wheel two.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. High-efficiency drive: The system can automatically adjust the speed and power of the fume fan based on real-time fume concentration detection data. When the amount of fume is large, it can quickly improve the performance of the fume fan, and reduce energy consumption when the amount of fume is small, thus achieving energy-saving operation. At the same time, it can ensure the effective removal of fume. When the pressure difference in the make-up air section is too small, it can quickly improve the performance of the make-up air fan. When the pressure difference is too large, it can reduce energy consumption, thus achieving energy-saving operation, while ensuring sufficient air intake.

[0016] 2. Overclocking function: The system can automatically perform overclocking under specific needs without replacing equipment, thus reducing equipment costs.

[0017] 3. Real-time monitoring and data analysis: Fume control equipment can monitor and record data such as gas concentration, temperature, operating parameters, and energy consumption in real time, helping end users understand the equipment's operation and emissions.

[0018] 4. Early warning function: When the monitored and compared data exceeds the predetermined emission threshold, the system will automatically issue an early warning to remind users to take timely measures to ensure compliance with environmental protection requirements.

[0019] 5. Remote monitoring: Users can remotely view real-time and historical data via mobile devices, making it easy to keep track of equipment operation at any time.

[0020] 6. Safety: It can detect dangerous gases and automatically activate and alarm in operation or standby mode to reduce safety hazards.

[0021] 7. In this invention, the purifier filters and purifies oil fumes while simultaneously cleaning the conical filter cartridge in real time, eliminating the need for manual cleaning. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall assembly structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the air purifier in this invention;

[0024] Figure 3 for Figure 2 A magnified cross-sectional view of point A in the diagram;

[0025] Figure 4 for Figure 2 A magnified structural diagram at point B in the diagram.

[0026] In the diagram: 1. Stovetop; 2. Fume Sensor 1; 3. Temperature Sensor; 4. Methane Sensor; 5. Pipeline; 6. Air Purifier; 7. Fume Fan; 8. Fume Sensor 2; 9. Fume Control Equipment; 10. Terminal; 11. Make-up Air Fan; 12. Differential Pressure Sensor; 13. Base; 14. Stand; 15. Horizontal Bracket; 16. Filter Box; 17. Conical Filter Cartridge; 18. Ring Frame; 19. Sealing Plate; 20. Brush Roller; 21. Drain Pipe; 22. Collection Box; 23. Motor; 24. Bevel Gear Set; 25. Pipe Shaft; 26. Mixing Box; 27. Column; 2 8. Spiral blade; 29. ​​Cantilever; 30. Gear 1; 31. Gear ring 1; 32. Spiral tube; 33. Shaft; 34. Friction disc; 35. Pump wheel 1; 36. Degreaser tank; 37. Water pipe 1; 38. Pump wheel 2; 39. Diluent tank; 40. Water pipe 2; 41. Slide rod; 42. Sliding sleeve; 43. Friction wheel 1; 44. Multi-faceted rod 1; 45. Sleeve 1; 46. Friction wheel 2; 47. Multi-faceted rod 2; 48. Sleeve 2; 49. Support arm; 50. Small hole; 51. Guide tube; 52. Cap; 53. Gear ring 2; 54. Gear 2; 55. Stirring shaft. Detailed Implementation

[0027] 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.

[0028] Please see Figures 1 to 4 The present invention provides a technical solution: an automatic fan control system, including an oil fume fan 7 for sucking and exhausting oil fumes generated by a stove 1, and also including a make-up air fan 11, a differential pressure sensor 12, a purifier 6 and an oil fume control device 9. The make-up air fan 11 is installed outdoors, the inlet end of the purifier 6 is connected to a pipe 5, and the stove 1, the purifier 6 and the oil fume fan 7 are connected through the pipe 5. A methane sensor 4 is installed on one side of the stove 1.

[0029] The purifier 6 has an oil fume sensor 2 and a temperature sensor 3 installed on the inlet pipe 5. The oil fume fan 7 has an oil fume sensor 8 installed on the outlet pipe 5. The oil fume control device 9 is connected to the stove 1, purifier 6, oil fume fan 7, oil fume sensor 2, temperature sensor 3, oil fume sensor 8, make-up air fan 11, differential pressure sensor 12 and methane sensor 4 respectively. The oil fume control device 9 is connected to the terminal 10 for signal connection.

[0030] In this embodiment, the purifier 6 includes a filter box 16 and a mixing box 26. The mixing box 26 is fixed on the base 13. The base 13 is fixed with a stand 14 and a collection box 22. The bottom of the filter box 16 is connected to the collection box 22 through a drain pipe 21. The filter box 16 is fixed on the stand 14. The upper end of the stand 14 is fixed with a cross brace 15. The cross brace 15 is fixed with a detergent box 36 and a diluent box 39.

[0031] In this embodiment, a conical filter cylinder 17 is provided inside the filter box 16, and the upper end of the conical filter cylinder 17 is coaxially fixedly connected to a ring frame 18 and fixed to the inner side wall of the filter box 16 through the ring frame 18. A sealing plate 19 is fixed to the lower end of the conical filter cylinder 17, and the air inlet end of the filter box 16 is located below the ring frame 18 and connected to the pipe 5. The air outlet end of the filter box 16 is located above the ring frame 18 and connected to the pipe 5. A spiral tube 32 is sleeved on the pipe 5 at the air inlet end of the filter box 16. The spiral tube 32 is fixed on the upright frame 14. The outlet end of the spiral tube 32 is connected to the bottom of the mixing box 26. A tube shaft 25 is connected through and rotatably connected to the bottom of the filter box 16. The tube shaft 25 and the conical filter cylinder 17 share the same central axis. The tube shaft 25 is connected to the motor 23 through a bevel gear set 24, and the motor 23 is fixed on the upright frame 14.

[0032] In this embodiment, a support arm 49 is fixed to the upper end of the tube shaft 25, and a brush roller 20 is rotatably connected to the support arm 49. The rotating shaft of the brush roller 20 is hollow inside, and multiple small holes 50 are opened on the side wall. A cap 52 is provided on the support arm 49. The cap 52 is connected to the inside of the tube shaft 25 through a conduit 51. The cap 52 is fitted and rotatably connected to the end of the rotating shaft. A gear 2 54 is coaxially fixed to the end of the rotating shaft away from the cap 52. A gear ring 2 53 is fixed on the inner wall of the filter box 16. The gear 2 54 and the gear ring 2 53 are meshed and connected.

[0033] In this embodiment, a column 27 is fixed to the bottom surface of the mixing box 26, the lower end of the tube shaft 25 is open, and the lower end of the tube shaft 25 penetrates the top wall of the mixing box 26 and extends into the inside of the column 27. A spiral blade 28 is fixed on a section of the peripheral wall inside the column shaft 27. A cantilever 29 is fixed on the side wall inside the mixing box 26, and a stirring shaft 55 is rotatably connected to the cantilever 29. A gear 30 is coaxially fixed to the upper end of the stirring shaft 55. A gear ring 31 is fixed on the inner wall of the mixing box 26, and the gear 30 meshes with the gear ring 31.

[0034] In this embodiment, a shaft 33 is connected through and rotatably on the top wall of the filter box 16. The upper end of the shaft 33 is coaxially fixedly connected to the friction disc 34, and the lower end is connected through the sealing plate 19 and coaxially fixedly connected to the upper end of the tube shaft 25.

[0035] In this embodiment, a first pump wheel 35 and a second pump wheel 38 are fixed on the upper surface of the filter box 16. The first pump wheel 35 and the second pump wheel 38 are symmetrically arranged on both sides of the friction disc 34. A first water pipe 37 is fixed and connected to the peripheral wall of the first pump wheel 35. The inlet end of the first water pipe 37 is connected to the detergent tank 36, and the outlet end is connected to the inlet end of the spiral tube 32. A second water pipe 40 is fixed and connected to the peripheral wall of the second pump wheel 38. The inlet end of the second water pipe 40 is connected to the diluent tank 39, and the outlet end is connected to the inlet end of the spiral tube 32. The outer walls of the first pump wheel 35 and the second pump wheel 38 are respectively fixedly connected to the two ends of the slide rod 41, and the slide rod 41 is perpendicular to the shaft 33. A sliding connection is sleeved on the slide rod 41. A sliding sleeve 42 is rotatably connected to a polygonal rod 44 and a polygonal rod 47. Friction wheels 43 and 46 are coaxially fixedly connected to the polygonal rods 44 and 47, respectively. The friction wheels 43 and 46 are located on both sides of the central axis of the friction disc 34. Both the polygonal rods 44 and 47 are perpendicular to the shaft 33. A matching sleeve 45 is sleeved and slidably connected to the polygonal rod 44, and the sleeve 45 is coaxially fixedly connected to the impeller shaft of the pump wheel 35. A matching sleeve 48 is sleeved and slidably connected to the polygonal rod 47, and the sleeve 48 is coaxially fixedly connected to the impeller shaft of the pump wheel 38.

[0036] Working principle and advantages of this invention: The working process of this automatic fan control system is as follows:

[0037] like Figure 1As shown, the entire system has two working sections: an exhaust section and a supplementary air section. In the exhaust section, the fume control device 9 regulates the operation of various equipment components. When the stove 1 is not in operation, the fume control device 9 controls the fume fan 7 to exhaust air at a preset speed. When the stove 1 is in operation, the fumes generated by the stove 1 are drawn into the duct 5 by the fume fan 7, filtered and purified by the purifier 6 before being discharged. During this process, data is collected and fed back to the fume control device 9 by the fume sensor 2, temperature sensor 3, and methane sensor 4. The algorithm outputs and adjusts the speed and power of the fume fan 7 to achieve energy saving. At the same time, the fume control device 9 monitors the fume emission concentration in real time through the fume sensor 8 to provide early warning. The system also reminds users at terminal 10 to ensure compliance with environmental emission requirements. In the make-up air section, while extracting fumes, the differential pressure sensor 12 monitors the pressure difference and feeds it back to the fume control device 9. The algorithm outputs the adjustment of the speed and power of the make-up air fan 11 to achieve energy saving. The system controls the speed and power of the fume fan 7 according to the concentration of kitchen fumes. Fume sensors are installed in the main flue corresponding to each stove 1. The number of sensors is determined by the number of stoves 1. Moreover, all fans in the system have a fan overclocking function. Under special needs, overclocking can be selected to cope with high air volume demand scenarios while reducing equipment investment costs. This fan automatic control system is equipped with automatic real-time data recording function and remote terminal real-time viewing function.

[0038] The beneficial effects of this type of automatic fan control system are:

[0039] 1. High-efficiency drive: The system can automatically adjust the speed and power of the fume fan 7 based on real-time fume concentration detection data. When the amount of fume is large, the performance of the fume fan 7 can be quickly improved, while the energy consumption can be reduced when the amount of fume is small, thus achieving energy-saving operation. At the same time, it ensures the effective removal of fume. When the pressure difference in the make-up air section is too small, the performance of the make-up air fan 11 can be quickly improved. When the pressure difference is too large, the energy consumption can be reduced, thus achieving energy-saving operation, while ensuring sufficient air intake.

[0040] 2. Overclocking function: The system can automatically perform overclocking under specific needs without replacing equipment, thus reducing equipment costs.

[0041] 3. Real-time monitoring and data analysis: The fume control equipment 9 can monitor and record data such as gas concentration, temperature, operating parameters, and energy consumption in real time, helping users at the terminal 10 to understand the equipment's operation and emissions.

[0042] 4. Early warning function: When the monitored and compared data exceeds the predetermined emission threshold, the system will automatically issue an early warning to remind users to take timely measures to ensure compliance with environmental protection requirements.

[0043] 5. Remote monitoring: Users can remotely view real-time and historical data via mobile devices, making it easy to keep track of equipment operation at any time.

[0044] 6. Safety: It can detect hazardous gases and automatically activate and alarm in operation or standby mode to reduce safety hazards.

[0045] As mentioned earlier, the working process of the oily fumes after entering the purifier 6 through pipe 5 is as follows:

[0046] like Figure 2 , Figure 3 and Figure 4 As shown, in the fume exhaust section, the fume control device 9 controls the fume fan 7 to draw in fumes through the pipe 5. The fumes enter the filter box 16 through the pipe 5 and are filtered by the conical filter cylinder 17 to remove the fume particles. The purified air is discharged from the outlet end of the filter box 16. During this process, the motor 23 works and drives the tube shaft 25 to rotate through the bevel gear set 24. The tube shaft 25 drives the brush roller 20 to rotate through the support arm 49. The brush roller 20 cleans the air impact side of the conical filter cylinder 17, brushing away the oil stains adhering to the air impact side of the conical filter cylinder 17, so as to maintain the high-efficiency filtration effect of the conical filter cylinder 17 and avoid clogging. Moreover, under the cooperation of the gear 2 54 and the gear ring 2 53, the brush roller 20 rotates around itself, thereby realizing a compound motion and improving the cleaning efficiency and effect of the air impact side of the conical filter cylinder 17.

[0047] While the tube shaft 25 rotates, it drives the friction disc 34 to rotate via the shaft 33. This causes the friction disc 34 to drive the first friction wheel 43 and the second friction wheel 46 to rotate in opposite directions. As a result, the first pump wheel 35 transports the detergent from the detergent tank 36 to the spiral tube 32 through the first water pipe 37, and the second pump wheel 38 transports the diluent from the diluent tank 39 to the spiral tube 32 through the second water pipe 40. This allows the detergent and diluent to be initially mixed in the spiral tube 32 before entering the mixing tank 26. Furthermore, the oil fume air in the pipe 5 can heat the mixture in the spiral tube 32, thereby utilizing the heat from the oil fume to promote the mixing of the detergent and diluent.

[0048] While the tube shaft 25 rotates, it drives the stirring shaft 55 to rotate via the cantilever 29. The stirring shaft 55 rotates around itself under the action of gear 30 and gear ring 31, thereby improving the thorough mixing of the liquid entering the mixing box 26. Then, the tube shaft 25 pressurizes the liquid entering the column cylinder 27 via the spiral blade 28 and transports it to the guide tube 51, then into the rotating shaft of the brush roller 20, and sprays it out through the small hole 50. This achieves simultaneous cleaning of the air-impact side of the conical filter cylinder 17 and spraying of the decontamination mixture, better removing oil stains adhering to the air-impact side of the conical filter cylinder 17. It also facilitates the dissolution and rinsing away of the brushed-off oil stains, which are then collected in the collection box 22 through the drain pipe 21, improving the purification effect of oil stains in the fumes.

[0049] As described above, by adjusting the position of the sliding sleeve 42 on the sliding rod 41, the transmission ratio of the friction disc 34 to the first friction wheel 43 and the second friction wheel 46 is adjusted, thereby adjusting the delivery ratio of the first pump wheel 35 and the second pump wheel 38 to the desiccant and diluent. In this way, the concentration of the desiccant mixture can be adjusted according to the actual situation, which is practical and convenient.

[0050] The adjustment operation is as follows: When the sliding sleeve 42 is moved to the right, the distance between friction wheel 43 and the center of friction disk 34 increases, while the distance between friction wheel 46 and the center of friction disk 34 decreases. At this time, the rotation speed of friction wheel 43 increases, and the rotation speed of friction wheel 46 decreases, thereby increasing the amount of cleaning agent delivered by pump wheel 35 and decreasing the amount of diluent delivered by pump wheel 38, thus increasing the concentration of the cleaning solution. When the sliding sleeve 42 is moved to the left, the distance between friction wheel 43 and the center of friction disk 34 decreases, while the distance between friction wheel 46 and the center of friction disk 34 increases. At this time, the rotation speed of friction wheel 43 decreases, and the rotation speed of friction wheel 46 increases, thereby decreasing the amount of cleaning agent delivered by pump wheel 35 and increasing the amount of diluent delivered by pump wheel 38, thus decreasing the concentration of the cleaning solution.

[0051] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0052] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A fan automatic control system, comprising an oil fume fan (7) used to suck and discharge the oil fume generated by a cooking hob (1), characterized in that: It also includes a make-up air fan (11), a differential pressure sensor (12), a purifier (6) and an oil fume control device (9), the make-up air fan (11) is arranged outdoors, the inlet end of the purifier (6) is connected with a pipeline (5), and the cooking bench (1), the purifier (6) and the oil fume fan (7) are connected through the pipeline (5), and the cooking bench (1) is provided with a methane sensor (4) on one side; The pipeline (5) on the inlet side of the purifier (6) is provided with an oil fume sensor one (2) and a temperature sensor (3), the pipeline (5) on the outlet side of the oil fume fan (7) is provided with an oil fume sensor two (8), the oil fume control device (9) is connected with the cooking bench (1), the purifier (6), the oil fume fan (7), the oil fume sensor one (2), the temperature sensor (3), the oil fume sensor two (8), the make-up air fan (11), the differential pressure sensor (12) and the methane sensor (4) respectively, and the oil fume control device (9) is signal connected with a terminal (10); The purifier (6) comprises a filter box (16) and a mixing box (26), the mixing box (26) is fixed on a base (13), the base (13) is fixed with a stand (14) and a collection box (22), the bottom of the filter box (16) is communicated with the collection box (22) through a blowdown pipe (21), and the filter box (16) is fixed on the stand (14), the upper end of the stand (14) is fixed with a cross brace (15), and the cross brace (15) is fixed with a decontamination agent box (36) and a dilution liquid tank (39); A conical filter cylinder (17) is arranged in the filter box (16), the upper end of the conical filter cylinder (17) is coaxially fixedly connected with a ring frame (18), and the ring frame (18) is fixed to the inner side wall of the filter box (16), the lower end of the conical filter cylinder (17) is fixed with a blocking plate (19), the air inlet end of the filter box (16) is located on the lower side of the ring frame (18) and connected with the pipeline (5), the air outlet end of the filter box (16) is located on the upper side of the ring frame (18) and connected with the pipeline (5), and a spiral pipe (32) is arranged on the pipeline (5) at the air inlet end of the filter box (16), the spiral pipe (32) is fixed on the stand (14), and the outlet end of the spiral pipe (32) is communicated with the bottom of the mixing box (26); The bottom of the filter box (16) penetrates and is fixedly connected with a pipe shaft (25) in rotation, and the pipe shaft (25) is arranged on the same central axis as the conical filter cylinder (17), the pipe shaft (25) is drivingly connected with a motor (23) through a bevel gear set (24), and the motor (23) is fixed on the stand (14). The upper end of the pipe shaft (25) is fixed with a support arm (49), and the brush roller (20) is rotationally connected with the support arm (49), and the rotating shaft of the brush roller (20) is hollow, and a plurality of small holes (50) are formed in the side wall, the support arm (49) is provided with a cap (52), the cap (52) is communicated with the inside of the pipe shaft (25) through the conduit (51), and the cap (52) is sleeved and rotationally connected with the end of the rotating shaft, the end of the rotating shaft away from the cap (52) is coaxially fixed with a gear two (54), and the inner wall of the filter box (16) is fixed with a gear ring two (53), and the gear two (54) is meshed with the gear ring two (53).

2. The automatic control system of a fan according to claim 1, characterized in that: The inside bottom surface of the mixing box (26) is fixed with a cylinder (27), the lower end of the pipe shaft (25) is open, and the lower end of the pipe shaft (25) penetrates the top wall of the mixing box (26) and extends into the cylinder (27), and the side wall of the pipe shaft (25) in the cylinder (27) is fixed with a spiral blade (28).

3. The automatic control system of a fan according to claim 2, characterized in that: The side wall of the pipe shaft (25) in the mixing box (26) is fixed with a cantilever (29), and the stirring shaft (55) is rotationally connected with the cantilever (29), the upper end of the stirring shaft (55) is coaxially fixed with a gear one (30), the inner wall of the mixing box (26) is fixed with a gear ring one (31), and the gear one (30) is meshed with the gear ring one (31).

4. The automatic control system for a fan according to claim 1, wherein: The top wall of the filter box (16) penetrates and rotationally connects with a shaft rod (33), the upper end of the shaft rod (33) is coaxially fixed with a friction disc (34), and the lower end penetrates the blocking plate (19) and is coaxially fixed with the upper end of the pipe shaft (25).

5. The automatic control system for a fan according to claim 4, wherein: The upper surface of the filter box (16) is fixed with a pump wheel one (35) and a pump wheel two (38), the pump wheel one (35) and the pump wheel two (38) are symmetrically arranged on the two sides of the friction disc (34), the peripheral wall of the pump wheel one (35) is fixed and communicated with a water pipe one (37), the inlet end of the water pipe one (37) is connected with the decontaminant box (36), and the outlet end is connected with the inlet end of the spiral pipe (32), the peripheral wall of the pump wheel two (38) is fixed and communicated with a water pipe two (40), the inlet end of the water pipe two (40) is connected with the diluent tank (39), and the outlet end is connected with the inlet end of the spiral pipe (32).

6. The automatic control system for a fan according to claim 5, wherein: The outer side wall of the pump wheel one (35) and the pump wheel two (38) are fixedly connected with both ends of the slide rod (41), and the slide rod (41) is vertically arranged with the shaft rod (33), the slide rod (41) is sleeved and slidably connected with the slide sleeve (42), the slide sleeve (42) is fixedly connected with the multi-rib rod one (44) and the multi-rib rod two (47) in rotation, the multi-rib rod one (44) and the multi-rib rod two (47) are coaxially fixedly connected with the friction wheel one (43) and the friction wheel two (46) respectively, the friction wheel one (43) and the friction wheel two (46) are located on both sides of the central axis of the friction disc (34), the multi-rib rod one (44) and the multi-rib rod two (47) are vertically arranged with the shaft rod (33), the multi-rib rod one (44) is sleeved and slidably connected with the matched sleeve one (45), and the sleeve one (45) is coaxially fixedly connected with the impeller shaft of the pump wheel one (35), the multi-rib rod two (47) is sleeved and slidably connected with the matched sleeve two (48), and the sleeve two (48) is coaxially fixedly connected with the impeller shaft of the pump wheel two (38).

Images