A fume hood purification device and control method

Abstract

The present application provides a kind of smoke hood purification device, including static part, smoke hood part, equipment control system and power supply;The static part includes electrostatic frame, electric field, fan, electric control box, air valve and sensor assemblyThe smoke hood part includes smoke hood frame, oil throwing disc, fire baffle, alarm device, touch screen;Equipment control system is electrically connected with the high-voltage power supply, fan, air valve, sensor assembly, oil throwing disc, touch screen and alarm device respectively, and the power supply is used to power supply for smoke hood purification device.The present application is safer, more energy-saving, purer, better oil discharge performance, and smaller noise, and the equipment can be operated stably, energy-efficiently and efficiently with low noise.

Description

Technical Field

[0001] This invention relates to the field of air purification, and more particularly to a fume hood purification device and control method. Background Technology

[0002] Fume hood purification devices are commonly used in medium and large kitchen equipment, mainly for the treatment of oil fume during the food processing process in hotels, restaurants, canteens, and even night market stalls. Currently, the air fume purification field mainly adopts the high-voltage electrostatic adsorption principle. The characteristics of the product are low power consumption, high efficiency, and the electric field can be repeatedly cleaned and reused, resulting in low operating costs. However, the existing fume hood purification devices have the following problems: (1) Most fume hood purification equipment on the market adopts the high-voltage electrostatic adsorption principle. High-voltage electrostatic products pose a fire risk, and the operation of the negative pressure fan promotes the spread of fire, which can easily cause serious losses after a fire starts. (2) The fume hood electrostatic products on the market are generally equipped with an oil slinger, an electrostatic unit, and a fan. The oil slinger mainly removes water molecules and large oil mist particles from the air, the fan mainly exhausts smoke, and the electrostatic unit mainly purifies oil fumes and oil mist. The oil slinger and fan on the market have constant speed and high noise. The output voltage and power of the electrostatic unit are constant. Therefore, the long-term operation of the fume hood purification devices on the market results in serious energy waste. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a fume hood purification device and control method.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a fume hood purification device, comprising an electrostatic unit, a fume hood unit, an equipment control system, and a power supply;

[0005] The electrostatic unit includes an electrostatic frame, an electric field, a fan, an electrical control box, a damper, and a sensor assembly. The electrostatic frame includes an air inlet and an air outlet. The electric field is located within the electrostatic frame. The damper is located at the front end of the electric field to control the opening and closing of the air inlet. The fan is installed at the rear end of the electric field and near the air outlet for exhausting air from the electrostatic unit. The electrical control box is fixed to the outer side of the electrostatic frame and includes a high-voltage power supply that is electrically connected to the electric field. The sensor assembly is installed at the air outlet.

[0006] The fume hood includes a fume hood frame, an oil slinger, a flame arrestor, an alarm device, and a touch screen. An oil slinger fixing plate is installed inside the fume hood frame, and the oil slinger fixing plate is inclined. The oil slinger is fixed to the oil slinger fixing plate. The flame arrestor is fixed below the oil slinger and is parallel to the oil slinger fixing plate. An exhaust port is provided above the oil slinger on the fume hood frame. The alarm device is located inside the fume hood frame. The air inlet is connected to the exhaust port. The touch screen is fixed to the front side of the fume hood frame.

[0007] The equipment control system is electrically connected to the high-voltage power supply, fan, air valve, sensor assembly, oil slinger, touch screen and alarm device respectively.

[0008] The power supply is connected to the equipment control system and is used to supply power to the fume hood purification device.

[0009] Furthermore, the air valve includes an air valve controller, air valve blades, an air valve connecting rod, and an air valve seal. The air valve controller is electrically connected to the equipment control system. The air valve controller is fixed to one end of the air valve connecting rod. The air valve blades are symmetrically fixed to both sides of the air valve connecting rod. The air valve seal is fixed to the outer side of the air valve blades.

[0010] Furthermore, the electrostatic frame is a box with a square cross-section. The air inlet and the air outlet are arranged diagonally on the electrostatic frame. The air inlet is located on the lower surface of one end of the electrostatic frame, and the air outlet is located on the upper surface of the other end of the electrostatic frame. The air inlet is square or circular. The air valve connecting rod is horizontally arranged above the center line of the air inlet in the front-back direction. The air valve blade is arranged inside the electrostatic frame and is installed at a 45° angle.

[0011] Furthermore, the electrostatic unit also includes a primary efficiency screen, a UV lamp, and activated carbon. The primary efficiency screen is installed at the front end of the electric field, the UV lamp is located at the rear end of the electric field, and the activated carbon is disposed between the UV lamp and the fan.

[0012] Furthermore, the electric field is configured as a dual-zone system, comprising a primary electrostatic field and a secondary electrostatic field, with the primary electrostatic field located near the air inlet; the electric field is connected to the high-voltage power supply via a pagoda-shaped insulating ceramic.

[0013] Furthermore, the fire-resistant plate has a streamlined design, with an oil leakage hole at the bottom and a vent hole near the bottom of the fire-resistant plate.

[0014] Furthermore, the vent hole includes a through hole and a reverse flow hood plate. The reverse flow hood plate is disposed on the side of the flame arrestor plate near the oil slinger plate. The reverse flow hood plate covers and is fixed to the outside of the through hole. The lower end of the reverse flow hood plate is open.

[0015] Furthermore, the smoke hood frame is also provided with a flame arrestor plate fixing groove, the flame arrestor plate fixing groove has an oil passage hole communicating with the oil tank, the bottom of the flame arrestor plate is set in the flame arrestor plate fixing groove, and a fixing clip is fixed on the upper part of the side of the flame arrestor plate facing the oil slinger plate; a horizontal bar is fixed below the oil slinger plate fixing plate by a connecting rod, and the fixing clip is fixed on the horizontal bar.

[0016] A method for controlling a fume hood purification device includes:

[0017] S1: Flame arrestor control for the fume hood purification device;

[0018] The sensor assembly continuously monitors the air temperature at the outlet. When the temperature is ≥200℃ and the duration exceeds 10 seconds, the equipment control system automatically shuts down the fan to stop exhausting the air and controls the damper blades to rotate 90° to close the air inlet. The equipment control system also sends a signal to the alarm device to trigger an alarm.

[0019] S2: Oil slinger operation control;

[0020] The oil-slinging plate has three settings: low, medium, and high. When the fume hood purification device is started, the oil-slinging plate defaults to the medium setting, which is a medium-speed start.

[0021] The sensor assembly constantly monitors the relative humidity of the exhaust air from the vent and adjusts the oil slinger setting based on the relative humidity.

[0022] S3: Static Electricity Control Unit Operation Control;

[0023] When the fume hood purification device is running, the sensor components constantly detect the concentration of oil fumes in the exhaust air. It starts with medium power consumption by default. Based on the concentration of oil fumes, the equipment control system controls the output voltage of the high-voltage power supply.

[0024] Furthermore, S2 specifically includes:

[0025] When the relative humidity in the exhaust air is less than 50% and continues for 3 minutes, the oil slinger automatically adjusts to a low gear and operates at low speed.

[0026] When the relative humidity in the exhaust air is 50%≤90% and continues for 3 minutes, the oil slinger automatically adjusts to the medium gear and operates at medium speed.

[0027] When the relative humidity in the exhaust air is >90% and continues for 3 minutes, the oil slinger automatically adjusts to a high gear and operates at high speed.

[0028] S3 specifically includes:

[0029] When the concentration of oil fume in the exhaust air is ≤0.4mg / m³ and lasts for 3 minutes, the high voltage output of the high voltage power supply is reduced by 10% for low power consumption operation.

[0030] When the concentration of oil fume in the exhaust air is less than 0.4 mg / m³ and less than 0.9 mg / m³, and this continues for 3 minutes, the high-voltage power supply outputs a high-voltage constant voltage, operating at medium power consumption.

[0031] When the relative humidity in the exhaust air is ≥0.9 mg / m³ and continues for 3 minutes, the high voltage output of the high voltage power supply is increased by 10%, and the power consumption is high.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The smoke hood purification device of the present invention has stronger safety performance; the sensor component detects the temperature, and if the temperature is too high, it will control the shutdown of the fan and the air valve to prevent oxygen from entering and flames from spreading, reduce fire losses, and give an alarm to the alarm device. It ensures that users can detect and deal with the fire in time, and minimize the fire losses. It ensures that the safety performance of the device is stronger. (2) The smoke hood purification device has better energy-saving performance; the sensor component controls the speed of the oil slinger, so that the equipment always maintains the most suitable operating state, and achieves low noise and low power consumption operation. (3) The smoke hood purification device has better purification performance; the sensor component controls the high voltage output of the high voltage power supply, so that the equipment always maintains the most suitable voltage, and achieves high-efficiency operation of the equipment. It meets the actual needs, and the purified air meets the emission standards. (4) The oil discharge performance is better; the inclined setting of the fire arrestor plate ensures that water and oil are discharged smoothly during the purification process. There is an oil leakage hole at the bottom of the fire arrestor plate. The fire arrestor plate is installed at an incline. There is a vent hole at the bottom of the fire arrestor plate to reduce condensation. The vent hole backflow design of the fire arrestor plate will not produce secondary oil leakage. The oil passage hole set in the fire arrestor plate fixing groove allows oil to flow into the oil tank through the fire arrestor plate fixing groove, preventing overflow and ensuring that oil droplets can enter the oil tank to avoid oil leakage. (5) Lower noise; the air valve blades are installed at a 45° angle. When air is intake, the air valve blades can play a guiding role. After the air hits the air valve blades, it is easier to flow towards the electric field, and the guiding is smoother. This avoids the air hitting the inner wall of the electrostatic frame after the air is intaked from the lower air inlet, which would cause equipment vibration and noise. This ensures that the electrostatic part can operate smoothly. At the same time, the fume hood purification device is generally installed at a high position above the stove, which reduces the vibration of the equipment and can reduce the pressure at the installation location to a certain extent, thus extending the service life of the equipment installation.

[0033] In summary, this invention ensures that the fume hood purification device operates with low noise, energy saving, high efficiency, and stable performance. Attached Figure Description

[0034] Figure 1This is a schematic diagram of the structure of the fume hood purification device of the present invention;

[0035] Figure 2 This is a schematic diagram of the electrostatic part of the fume hood purification device of the present invention;

[0036] Figure 3 This is a schematic diagram of the structure of the fume hood section of the fume hood purification device of the present invention;

[0037] Figure 4 This is a schematic diagram of the installation structure of the fume hood section of the fume hood purification device of the present invention;

[0038] Figure 5 This is a three-dimensional structural diagram of the flame arrestor plate of the fume hood purification device of the present invention;

[0039] Figure 6 This is a left view of the flame arrestor plate of the fume hood purification device of the present invention;

[0040] Figure 7 This is a partial structural diagram of the fume hood section of the fume hood purification device of the present invention;

[0041] Figure 8 This is a schematic diagram of the structure of the air valve of the fume hood purification device of the present invention;

[0042] Figure 9 This is a schematic diagram of the control of the air valve of the fume hood purification device of the present invention;

[0043] Figure 10 This is a schematic diagram of the control system of the fume hood purification device of the present invention. Implementation

[0044] To provide a further understanding of the purpose, structure, features, and functions of the present invention, detailed descriptions are provided below with reference to specific embodiments.

[0045] Combination Figure 1-7 A fume hood purification device includes an electrostatic unit 100, a fume hood unit 200, an equipment control system, and a power supply.

[0046] The electrostatic unit 100 includes an electrostatic frame 110, an electric field 120, a fan 130, an electrical control box 140, a damper 150, and a sensor assembly 160. The electrostatic frame 110 includes an air inlet 111 and an air outlet 112. The electric field 120 is disposed within the electrostatic frame 110. The damper 150 is disposed at the front end of the electric field 120 to control the opening and closing of the air inlet 111. The fan 130 is installed at the rear end of the electric field 120 and near the air outlet 112 for exhausting air from the electrostatic unit. The fan 130 can be an EC centrifugal fan, which can be continuously adjusted, allowing customers to adjust the fan speed as needed, resulting in greater energy savings. The electrical control box 140 is fixed to the outer side of the electrostatic frame 110. The electrical control box 140 includes a high-voltage power supply 141, which is electrically connected to the electric field 120. The sensor assembly 160 is installed at the air outlet 112 and is used to detect the air temperature, relative humidity, and oil fume concentration at the air outlet 112. The sensor assembly 160 may include a temperature sensor, a humidity sensor, and an oil fume concentration sensor.

[0047] The fume hood 200 includes a fume hood frame 210, an oil slinger 220, a flame arrestor plate 230, an alarm device, a touch screen 240, and a lighting lamp 250. The fume hood frame 210 is provided with an oil slinger plate fixing plate 211, which is inclined. The oil slinger 220 is fixed on the oil slinger plate fixing plate 211. The flame arrestor plate 230 is fixed below the oil slinger 220. The flame arrestor plate 230 is parallel to the oil slinger plate fixing plate 211, ensuring that large oil mist particles and water molecules slinged off by the oil slinger 220 can flow down the inclined flame arrestor plate 230 and finally enter the oil tank, ensuring smooth oil drainage. An exhaust port 212 is provided at the fume hood frame 210 above the oil slinger 220, and the alarm device is installed inside the fume hood frame 210. The air inlet 111 is connected to the exhaust port 212, and can be connected by a pipeline or by directly installing the electrostatic unit 100 and the fume hood 200 together. The air inlet 111 and the exhaust port 212 are correspondingly arranged to ensure that the air from the exhaust port 212 can enter the electrostatic unit 100 for purification. The touch screen is fixed on the front side of the fume hood frame and is used for manual operation of the touch screen 240 to send control signals to the equipment control system and control the start and stop of the equipment. The touch screen 240 controls the switch, which is simple and easy to operate. A lighting mounting plate 213 is also provided inside the fume hood frame 210 for installing the lighting lamp 250. The lighting lamp 250 is electrically connected to the equipment control system and is used to control the switching of the lighting lamp 250 and the on / off of its power supply. The lighting is used to turn on at night or in poor lighting conditions, improving the user's operating experience and making it simpler and more convenient to use. The lighting 250 is installed on the range hood frame 210, and when in use, it can illuminate the kitchen stove equipment, preventing the range hood frame from blocking the outside lighting when installed on the upper side of the kitchen stove equipment, and ensuring a bright field of vision.

[0048] The equipment control system is electrically connected to the high-voltage power supply 141, the fan 130, the air valve 150, the sensor assembly 160, the oil slinger 220, the touch screen 240, and the alarm device, respectively; it is used to control the operation of each component and control the power supply.

[0049] The power supply is connected to the equipment control system and is used to supply power to the fume hood purification device.

[0050] During operation, oily air enters the fume hood frame 210 through the flame arrestor plate 230. The oil slinger 220 removes water molecules and large oil mist particles from the air, and the air then enters the air inlet 111 of the electrostatic unit 100 through the exhaust outlet 212. From there, it enters the electrostatic frame 110, where the oily fumes and mist are purified by the electric field 120. Finally, the purified air is discharged through the exhaust outlet 112 by the fan 130. This ensures the normal operation of the equipment and effectively removes oily fumes. The flame arrestor plate 230 reduces the entry of open flames during kitchen operations, thus reducing the probability of fire within the fume hood purification device.

[0051] like Figure 8 The damper 150 includes a damper controller 151, damper blades 152, damper connecting rods 153, and damper seals 154. The damper controller 151 is electrically connected to the equipment control system. The damper controller 151 is fixed to one end of the damper connecting rod 153. The damper blades 152 are symmetrically fixed to both sides of the damper connecting rod 153. The damper seals 154 are fixed to the outer side of the damper blades 152. During use, the damper controller controls the damper connecting rod 153 to rotate, thereby driving the damper blades 152 to rotate. The damper seals 154 on the outer side of the damper blades 152 are made of elastic material, which can achieve the sealing of the damper and support the rotation of the damper blades 152.

[0052] like Figure 2 and Figure 9 The electrostatic frame 110 is a box with a square cross-section. The air inlet 111 is located on the lower surface of one end of the electrostatic frame 110, and the air outlet 112 is located on the upper surface of the other end of the electrostatic frame 110. The air inlet 111 and the air outlet 112 are arranged diagonally on the electrostatic frame 110, with a greater distance between them, ensuring that the oily gas can enter the electrostatic frame 110 for thorough purification and improving the purification efficiency of the equipment. The air inlet 111 is square or circular. The damper connecting rod is horizontally positioned above the center line of the air inlet 111 in the front-back direction. The damper blade 152 is located inside the electrostatic frame and is installed at a 45° angle. At this time, the damper blade 152 of the device is in the open state, and the device draws air in through the air inlet below the damper blade 152. The damper blade 152 acts as a guide, and after air impacts the damper blade 152, it flows more easily towards the electric field, resulting in smoother airflow. This prevents air from impacting the inner wall of the electrostatic frame 110 after air enters through the lower air inlet, thus avoiding equipment vibration and noise. This ensures stable operation of the electrostatic unit. Furthermore, since the fume hood purification device is generally installed at a high position above the stove, reducing equipment vibration can also reduce pressure at the installation site, extending the device's service life. Closing the damper blade only requires a 90° rotation, making operation simple and convenient. The control algorithm is simple, requiring minimal modification and resulting in low implementation costs.

[0053] like Figure 2The electrostatic unit also includes a primary filter 170, a UV lamp 180, and activated carbon. The primary filter 170 is installed at the front end of the electric field, the UV lamp 180 is located at the rear end of the electric field, and the activated carbon is placed between the UV lamp 180 and the fan 130 to ensure that the air sterilized by the UV lamp 180 can be further adsorbed by the activated carbon, ensuring the cleanliness of the purification. The UV lamp 180 adopts a dual-band design of 185nm and 254nm, providing high light intensity. Air entering this device passes through a flame arrestor 230, an oil slinger 220, a primary filter 170, electrostatic purification by the electric field 120, irradiation by the UV lamp 180, and activated carbon adsorption, before finally being discharged outside the equipment by the fan. This combination of different purification and sterilization processes results in high purification efficiency.

[0054] The electric field 120 is designed with two zones, including a primary electrostatic field 121 and a secondary electrostatic field 122. The primary electrostatic field is located near the air inlet. The electric field 120 is connected to the high-voltage power supply via a pagoda-shaped insulating ceramic. The dual-zone design of the electric field 120 ensures the efficiency of the equipment's purification and achieves thorough air purification. The pagoda-shaped insulating ceramic not only ensures good insulation performance but also prevents it from being contaminated by oil fumes and has strong dirt resistance, thus facilitating the cleaning of the electric field.

[0055] like Figure 5 , Figure 6 as well as Figure 7 The flame arrestor plate 230 has a streamlined design and a smooth surface, allowing the removed oil mist and moisture to flow smoothly. The flame arrestor plate 230 has an oil drain hole 231 at its bottom and a vent hole 232 near the bottom. The oil drain hole 231 ensures smooth oil drainage, and the vent hole 232 reduces the generation of condensate inside the device.

[0056] The vent 232 includes a through hole 233 and a backflow shield 234. The backflow shield 234 is disposed on the side of the flame arrestor plate 230 near the oil slinger. The backflow shield 234 covers and is fixed to the outside of the through hole 233, and the lower end of the backflow shield 234 is open. The backflow shield 234 covers the through hole 231. The opening is designed on the lower end of the backflow shield 234. The flame arrestor plate 230 is inclined. When oil droplets pass through the vent, they can only flow downward through the backflow shield 234, so they will not flow out from the opening. The backflow design at the vent 232 prevents secondary oil leakage. The vent 232 can prevent oil backflow and the accumulation of a large amount of water vapor.

[0057] like Figure 2 , Figure 4 and Figure 7The fume hood frame is further provided with a flame arrestor plate fixing groove 260. The flame arrestor plate fixing groove 260 has an oil passage hole 261 communicating with the oil tank. The bottom of the flame arrestor plate 230 is located within the flame arrestor plate fixing groove 260, and a fixing clip 235 is fixed to the upper part of the side of the flame arrestor plate 230 facing the oil slinger. A horizontal rod 280 is fixed below the oil slinger plate 211 via a connecting rod 270, and the fixing clip 235 is secured to the horizontal rod 280. The fixing clip 235 ensures that the flame arrestor plate 230 is parallel to the oil slinger plate 211, while also ensuring that the flame arrestor plate 230 is easy to disassemble, install, and replace. The oil passage hole in the flame arrestor plate fixing groove 260 prevents overflow and ensures that oil droplets can enter the oil tank, avoiding oil leakage.

[0058] Combination Figure 10 A method for controlling a fume hood purification device, comprising:

[0059] S1: Flame arrestor control for the fume hood purification device;

[0060] Sensor assembly 160 continuously monitors the air temperature at outlet 112. When the temperature reaches ≥200℃ and persists for more than 10 seconds, the equipment control system automatically shuts down the fan to stop exhaust ventilation and controls the damper blades to rotate 90° to close the air inlet 111. The equipment control system also sends a signal to the alarm device to trigger an alarm. The closure of the fan 130 and air inlet 111 prevents oxygen from entering and flames from spreading, reducing fire damage and triggering an alarm. This ensures that users can promptly detect and handle the fire, minimizing fire losses.

[0061] S2: Oil slinger operation control;

[0062] The oil slinger 220 has three settings: low, medium, and high. When the fume hood purification device is started, the oil slinger defaults to the medium setting, which is a medium-speed start.

[0063] The sensor assembly 160 constantly detects the relative humidity of the exhaust air from the vent and adjusts the oil slinger 220 setting based on the relative humidity.

[0064] When the relative humidity in the exhaust air is less than 50% and continues for 3 minutes, the oil slinger 220 automatically adjusts to a low gear and operates at low speed.

[0065] When the relative humidity in the exhaust air is 50%≤90% and continues for 3 minutes, the oil slinger 220 automatically adjusts to the medium gear and operates at medium speed.

[0066] When the relative humidity in the exhaust air is >90% and continues for 3 minutes, the oil slinger 220 automatically adjusts to a high gear and operates at high speed.

[0067] By detecting the relative humidity of the air and controlling the setting of the oil slinger, the fume hood purification device can always maintain the most suitable operating state, achieving low noise and low power consumption operation.

[0068] S3: Static Electricity Control Unit Operation Control;

[0069] When the fume hood purification device is running, the sensor component 160 constantly detects the concentration of oil fumes in the exhaust air. It starts with medium power consumption by default. Based on the concentration of oil fumes, the equipment control system controls the output voltage of the high-voltage power supply.

[0070] When the concentration of oil fume in the exhaust air is ≤0.4mg / m³ and continues for 3 minutes, the high voltage output of the high voltage power supply is reduced by 10% for low power consumption operation.

[0071] When the concentration of oil fume in the exhaust air is less than 0.4 mg / m³ and less than 0.9 mg / m³, and this continues for 3 minutes, the high-voltage power supply outputs a high-voltage constant voltage, operating at medium power consumption.

[0072] When the relative humidity in the exhaust air is ≥0.9 mg / m³ and continues for 3 minutes, the high voltage output of the high voltage power supply is increased by 10%, and the power consumption is high.

[0073] Based on the actual concentration of oil fumes in the exhaust air, the voltage of the electrostatic field is adjusted to ensure the equipment maintains the most suitable voltage at all times, achieving high-efficiency operation. While ensuring high purification efficiency, it also guarantees emission efficiency, ensuring the purified air meets emission standards. This reduces energy waste, promotes energy-saving operation, and minimizes noise generation. Furthermore, the equipment adjusts its operating status according to actual conditions, avoiding long-term constant pressure operation that could lead to high operating pressure and affect its lifespan.

[0074] The present invention has been described by the above-described embodiments; however, these embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the present invention. Conversely, any modifications and refinements made without departing from the spirit and scope of the present invention are within the scope of patent protection of the present invention.

Claims

1. A fume hood purification device, characterized in that: This includes the electrostatic discharge unit, fume hood unit, equipment control system, and power supply. The electrostatic unit includes an electrostatic frame, an electric field, a fan, an electrical control box, a damper, and a sensor assembly. The electrostatic frame includes an air inlet and an air outlet. The electric field is located within the electrostatic frame. The damper is located at the front end of the electric field to control the opening and closing of the air inlet. The fan is installed at the rear end of the electric field and near the air outlet for exhausting air from the electrostatic unit. The electrical control box is fixed to the outer side of the electrostatic frame and includes a high-voltage power supply that is electrically connected to the electric field. The sensor assembly is installed at the air outlet. The fume hood includes a fume hood frame, an oil slinger, a flame arrestor, an alarm device, and a touch screen. An oil slinger fixing plate is installed inside the fume hood frame, and the oil slinger fixing plate is inclined. The oil slinger is fixed to the oil slinger fixing plate. The flame arrestor is fixed below the oil slinger and is parallel to the oil slinger fixing plate. An exhaust port is provided above the oil slinger on the fume hood frame. The alarm device is located inside the fume hood frame. The air inlet is connected to the exhaust port. The touch screen is fixed to the front side of the fume hood frame. The flame arrestor plate has a streamlined design, and an oil leakage hole is provided at the bottom of the flame arrestor plate. A vent hole is also provided near the bottom of the flame arrestor plate. The vent hole includes a through hole and a backflow hood plate. The backflow hood plate is disposed on the side of the flame arrestor plate near the oil slinger plate. The backflow hood plate is fixed to the outside of the through hole. The lower end of the backflow hood plate is open. The smoke hood frame is also provided with a flame arrestor plate fixing groove. The flame arrestor plate fixing groove has an oil passage hole communicating with the oil tank. The equipment control system is electrically connected to the high-voltage power supply, fan, air valve, sensor assembly, oil slinger, touch screen and alarm device respectively. The power supply is connected to the equipment control system and is used to supply power to the fume hood purification device.

2. The fume hood purification device as described in claim 1, characterized in that: The air valve includes an air valve controller, air valve blades, an air valve connecting rod, and an air valve seal. The air valve controller is electrically connected to the equipment control system. The air valve controller is fixed to one end of the air valve connecting rod. The air valve blades are symmetrically fixed to both sides of the air valve connecting rod. The air valve seal is fixed to the outer side of the air valve blades.

3. The fume hood purification device as described in claim 2, characterized in that: The electrostatic frame is a box with a square cross-section. The air inlet and the air outlet are arranged diagonally on the electrostatic frame. The air inlet is located on the lower surface of one end of the electrostatic frame, and the air outlet is located on the upper surface of the other end of the electrostatic frame. The air inlet is square or circular. The air valve connecting rod is horizontally arranged above the center line of the air inlet in the front-back direction. The air valve blade is arranged inside the electrostatic frame and is installed at a 45° angle.

4. The fume hood purification device as described in claim 1, characterized in that: The electrostatic unit also includes a primary filter screen, a UV lamp, and activated carbon. The primary filter screen is installed at the front end of the electric field, the UV lamp is located at the rear end of the electric field, and the activated carbon is located between the UV lamp and the fan.

5. The fume hood purification device as described in claim 1, characterized in that: The electric field is configured as a dual-zone system, including a primary electrostatic field and a secondary electrostatic field. The primary electrostatic field is located near the air inlet. The electric field is connected to the high-voltage power supply via a pagoda-shaped insulating ceramic.

6. The fume hood purification device as described in claim 1, characterized in that: The bottom of the flame arrestor plate is set in the flame arrestor plate fixing groove, and a fixing clip is fixed on the upper part of the side of the flame arrestor plate facing the oil slinger plate; a horizontal rod is fixed below the oil slinger plate by a connecting rod, and the fixing clip is fastened to the horizontal rod.

7. A control method for the fume hood purification device according to any one of claims 1-6, characterized in that: include: S1: Flame arrestor control for the fume hood purification device; The sensor assembly continuously monitors the air temperature at the outlet. When the temperature is ≥200℃ and the duration exceeds 10 seconds, the equipment control system automatically shuts down the fan to stop exhausting the air and controls the damper blades to rotate 90° to close the air inlet. The equipment control system also sends a signal to the alarm device to trigger an alarm. S2: Oil slinger operation control; The oil-slinging plate has three settings: low, medium, and high. When the fume hood purification device is started, the oil-slinging plate defaults to the medium setting, which is a medium-speed start. The sensor assembly constantly monitors the relative humidity of the exhaust air from the vent and adjusts the oil slinger setting based on the relative humidity. S3: Static Electricity Control Unit Operation Control; When the fume hood purification device is running, the sensor components constantly detect the concentration of oil fumes in the exhaust air. It starts with medium power consumption by default. Based on the concentration of oil fumes, the equipment control system controls the output voltage of the high-voltage power supply.

8. The control method for the fume hood purification device as described in claim 7, characterized in that: S2 specifically includes: When the relative humidity in the exhaust air is less than 50% and continues for 3 minutes, the oil slinger automatically adjusts to a low gear and operates at low speed. When the relative humidity in the exhaust air is 50%≤90% and continues for 3 minutes, the oil slinger automatically adjusts to the medium gear and operates at medium speed. When the relative humidity in the exhaust air is >90% and continues for 3 minutes, the oil slinger automatically adjusts to a high gear and operates at high speed. S3 specifically includes: When the concentration of oil fume in the exhaust air is ≤0.4mg / m³ and continues for 3 minutes, the high voltage output of the high voltage power supply is reduced by 10% for low power consumption operation. When the concentration of oil fume in the exhaust air is less than 0.4 mg / m³ and less than 0.9 mg / m³, and this continues for 3 minutes, the high-voltage power supply outputs a high-voltage constant voltage, operating at medium power consumption. When the relative humidity in the exhaust air is ≥0.9 mg / m³ and continues for 3 minutes, the high voltage output of the high voltage power supply is increased by 10%, and the power consumption is high.

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