A range hood and a method of operating the same

Abstract

This invention discloses a range hood and its operating method. The range hood includes a casing with an air chamber inside; a smoke collection hood with a smoke collection cavity communicating with the air chamber, and a smoke inlet communicating with the smoke collection cavity; a smoke gathering assembly installed on the smoke collection hood and / or the casing and movable relative to the smoke inlet to open the smoke inlet to different degrees; a fan installed in the air chamber; a sensing module assembly installed on the smoke collection hood for real-time acquisition of oil fume concentration C, oil fume ambient temperature T, oil fume lateral diffusion velocity Vx, and oil fume vertical rising velocity Vy; and a control module communicatively connected to the smoke gathering assembly, the fan, and the sensing module assembly, the control module controlling the operation of the smoke gathering assembly and / or the fan based on the oil fume concentration C, oil fume ambient temperature T, oil fume lateral diffusion velocity Vx, and oil fume vertical rising velocity Vy acquired by the sensing module.

Description

Technical Field

[0001] This invention relates to the field of kitchen appliance technology, and in particular to a range hood and its operating method. Background Technology

[0002] Top-and-side dual-suction range hoods, with their advantage of dual-channel air intake and smoke control, have become the mainstream model in the industry. Existing top-and-side dual-suction models typically employ dual air intakes on the side and top. The side features air inlets and automatically rotating smoke-collecting panels, while the top has an air inlet. However, the top air inlet is positioned relatively high, leading to smoke leakage and incomplete smoke removal. Common technical defects in intelligent control solutions for range hoods include: limited smoke perception dimensions, poor adaptability of intelligent algorithms, unreasonable control logic, coarse-grained operating condition classification, inability to balance smoke control, noise reduction and energy consumption, lack of personalized adaptive capabilities, and low reliability in harsh environments.

[0003] Therefore, there is an urgent need for a range hood and its operating method to solve the above problems. Summary of the Invention

[0004] This invention aims to at least partially solve one of the problems existing in the prior art. To this end, this invention proposes a range hood that uses a sensing module to collect data in real time on the oil fume concentration C, the ambient temperature T, the lateral diffusion speed Vx, and the longitudinal rising speed Vy of the oil fume. This allows for a relatively accurate assessment of the oil fume situation. Furthermore, the opening of the smoke inlet can be adjusted by the smoke collection component, making the smoke inlet adaptable to different working conditions. The structure is simple and has a good smoke collection effect.

[0005] The above objectives are achieved through the following technical solutions: A range hood, comprising: The chassis contains an air chamber. A smoke collection hood has a smoke collection chamber inside that communicates with the air cavity, and a smoke inlet on the smoke collection hood that communicates with the smoke collection chamber. A smoke collection assembly is installed on the smoke collection hood and / or the chassis and is movable relative to the smoke inlet to close or open the smoke inlet to different degrees; A fan is installed inside the air cavity; The sensing module assembly is installed on the fume hood and is used to collect the oil fume concentration C, the oil fume ambient temperature T, the oil fume lateral diffusion velocity Vx and the oil fume longitudinal rising velocity Vy in real time. The control module is communicatively connected to the smoke collection component, the fan, and the sensing module component. The control module is used to control the operation of the smoke collection component and / or the fan based on the oil fume concentration C, oil fume ambient temperature T, oil fume lateral diffusion velocity Vx, and oil fume longitudinal rising velocity Vy collected by the sensing module.

[0006] Optionally, the smoke hood includes a top cover and a rear cover. The top cover is disposed on the lower side of the chassis, and the rear cover is disposed on the rear side of the top cover and extends downward. The smoke inlet includes a top smoke inlet and a rear smoke inlet. The smoke collection chamber includes a top smoke collection chamber and a rear smoke collection chamber. The top smoke collection chamber is formed inside the top cover, and the top smoke inlet communicating with the top smoke collection chamber is formed on the lower side of the top cover. The rear smoke collection chamber is formed inside the rear cover, and the front side of the rear cover has a connection to the rear smoke collection chamber. The smoke collection chamber is connected to the rear smoke inlet, which is positioned lower than the top smoke inlet. The smoke collection assembly includes a top smoke collection plate assembly and a rear smoke collection plate assembly. The top smoke collection plate assembly is mounted on the smoke collection hood and / or the chassis and is movable relative to the top smoke inlet to open the top smoke inlet to different degrees. The rear smoke collection plate assembly is mounted on the smoke collection hood and / or the chassis and is movable relative to the rear smoke inlet to open the rear smoke inlet to different degrees.

[0007] Optionally, the sensing module assembly includes a first sensing module and a second sensing module. The first sensing module is disposed around the rear smoke inlet, and the second sensing module is disposed around the top smoke inlet. The first sensing module includes a gas-sensitive oil fume concentration sensor, an infrared non-contact temperature sensor, and a lateral wind speed sensor. The second sensing module includes an infrared non-contact temperature sensor and a vertical wind speed sensor. The gas-sensitive oil fume concentration sensor is used to collect the oil fume concentration C in real time. The infrared non-contact temperature sensor is used to collect the oil fume ambient temperature T in real time. The lateral wind speed sensor is used to collect the lateral diffusion velocity Vx of the oil fume in real time. The vertical wind speed sensor is used to collect the longitudinal rising velocity Vy of the oil fume in real time.

[0008] Optionally, the top smoke-gathering plate assembly includes a first driving component and a first smoke-gathering plate. The first driving component is installed in the air cavity and the top smoke-gathering cavity, and the first smoke-gathering plate is installed at the output end of the first driving component. The first driving component can drive the first smoke-gathering plate to move up and down to close or open the top smoke inlet to different degrees. And / or the rear smoke-gathering plate assembly includes a second driving component and a second smoke-gathering plate. The second driving component is installed in the rear smoke-gathering cavity, and the second smoke-gathering plate is installed at the output end of the second driving component. The second driving component can drive the second smoke-gathering plate to move up and down to close or open the rear smoke inlet to different degrees.

[0009] Another aspect of the present invention provides a method for operating a range hood as described above, comprising the following steps: S1: Range hood is on; S2: Collect the following valid raw data multiple times at regular intervals: oil fume concentration C, oil fume temperature T, oil fume lateral diffusion velocity Vx, and oil fume longitudinal rising velocity Vy; S3: The following six-dimensional characteristic parameters of oil fume are calculated: average oil fume concentration C0, concentration increment ΔC, average oil fume temperature T0, temperature rise rate ΔT, average lateral diffusion velocity of oil fume Vx0, and average longitudinal ascent velocity of oil fume Vy0. S4: Classify ΔT, Vx0, and Vy0 as high-risk mutation features, and C0, ΔC, and T0 as steady-state correction features. Assign weights q1 to ΔT, q2 to Vx0, q3 to Vy0, q4 to C0, q5 to ΔC, and q6 to T0, respectively. q1+q2+q3=Q1, q4+q5+q6=Q1, Q1>Q2, Q1+Q2=1. Perform extreme value normalization on ΔT, Vx0, Vy0, C, ΔC, and T0 to map them to the dimensionless interval (0,1], thereby obtaining the standard values ​​X of ΔT, Vx0, Vy0, C0, ΔC, and T0. ΔT ', X Vx ', X Vy ', X C ', X ΔC ', X T '; S5: Based on X ΔT ', X Vx ', X Vy ', X C ', X ΔC ', X T ', Combining the weights of ΔT, Vx0, Vy0, C0, ΔC, and T0, a weighted sum is obtained to obtain the baseline risk score S0 located in the dimensionless interval (0,1], S0 = q1X ΔT '+ q2X Vx '+ q3 X Vy '+q4X C '+ q5 X ΔC '+ q6 X T '; S6: The top smoke-gathering plate assembly operates according to S0 to adjust the opening of the top smoke inlet; and / or the rear smoke-gathering plate assembly operates according to S0 to adjust the opening of the rear smoke inlet; and / or adjusts the speed of the fan according to S0.

[0010] Optionally, the top smoke-gathering plate assembly can move between a first position and a second position. When the top smoke-gathering plate assembly is in the first position, the smoke-inlet area of ​​the top smoke inlet is W1, and when the top smoke-gathering plate assembly is in the second position, the smoke-inlet area of ​​the top smoke inlet is W2, where 0 < W1 < W2. The rear smoke-gathering plate assembly can move between a third position and a fourth position. When the smoke-gathering plate assembly is in the third position, the smoke-inlet area of ​​the rear smoke inlet is W3, and when the rear smoke-gathering plate assembly is in the fourth position, the smoke-inlet area of ​​the rear smoke inlet is W4, where 0 < W3 < W4.

[0011] Optionally, the top smoke-gathering plate assembly can move up and down between a first position and a second position, where the first position is higher than the second position; the rear smoke-gathering plate assembly can move up and down between a third position and a fourth position, where the fourth position is higher than the third position.

[0012] Optionally, S6 includes the following four control logics: The first control logic is as follows: when 0 < S0 < 0.2, and C ≤ 0.3 mg / m³, ΔC ≤ 0.01 mg / m³ within any 10 ms, T ≤ 45℃, ΔT ≤ 0.5℃ within any 10 ms, Vx ≤ 2 cm / s, and Vy ≤ 3 cm / s, it is determined that the current working condition belongs to a low-risk steady-state working condition with minimal oil fume. The top smoke collection plate group is located at the first position, the rear smoke collection plate group is located at the third position, and the fan speed is within the range of 600 r / min to 650 r / min. The second control logic is as follows: When 0.2≤S0<0.4, and 0.3<C≤0.8mg / m³, within any 10ms, 0.01<ΔC≤0.03mg / m³, 45<T≤65℃, and within any 10ms, 0.5<ΔT≤1.2℃, it is determined that the current working condition belongs to the normal oil fume steady-state working condition. Under this working condition, when 3cm / s<Vy≤6cm / s and Vx≤3cm / s, the top smoke gathering plate group descends by a first distance H1, the rear smoke gathering plate group is at the third position, and the fan speed is within the range of 600r / min to 900r / min. When Vy≤3cm / s and 3<Vx≤6cm / s, the top smoke gathering plate group is at the first position, the rear smoke gathering plate group is at the fourth position, and H1>0. The third control logic is as follows: when 0.4≤S0<0.85, and 0.8<C≤1.5mg / m³, within any 10ms, 0.03<ΔC≤0.08mg / m³, 65<T≤90℃, within any 10ms, 1.2<ΔT≤3℃, 3cm / s<Vx≤6cm / s, 6cm / s<Vy≤12cm / s, it is determined that the current working condition belongs to the sudden change condition of high oil fume during stir-frying. The top smoke gathering plate group descends by the second distance H2, the rear smoke gathering plate group is in the fourth position, the speed of the fan is in the range of 1100r / min to 1400r / min, Dmax>H2>H1, and Dmax is the distance between the first position and the second position. The fourth control logic is as follows: when 0.85≤S0≤1, and C>1.5mg / m³, ΔC>0.08mg / m³ within any 10ms, T>90℃, ΔT>3℃ within any 10ms, Vx>6cm / s, and Vy>12cm / s, it is determined that the current working condition belongs to the high-risk sudden change working condition of smoke escape correction. The top smoke gathering plate group is in the second position, the rear smoke gathering plate group is in the fourth position, and the speed of the fan is in the range of 1400r / min to 1800r / min.

[0013] Optionally, in the second control logic, if the current working condition is a normal oil fume steady-state working condition, when 0.2≤S0<0.3, the speed of the fan is in the range of 600r / min to 750r / min, and when 0.3≤S0<0.4, the speed of the fan is in the range of 750r / min to 900r / min.

[0014] Optionally, in the third control logic, if the current operating condition is a sudden change in high oil fume during stir-frying, the following steps are executed: S101: The fan operates at a speed of 1100r / min, the rear smoke collection plate group is in the fourth position, and the top smoke collection plate group is lowered to the first distance H1; S102: The top smoke-collecting plate assembly descends a distance of Hk; S103: Determine if S0≥0.4. If yes, proceed to S104. If no, run the second type of control logic. S104: Determine if H2 = Dmax. If yes, proceed to S105; otherwise, return to S102. S105: The rotational speed of the fan is increased by J1 speed; S106: Determine if S0≥0.4. If yes, proceed to S107. If no, run the second type of control logic. S107: Determine whether the current speed of the fan has reached 1400 r / min. If yes, run the fourth control logic. If no, return to S105. Where 0 < Hk ≤ Dmax - H1, 0 < J1 ≤ 1400 r / min - 1100 r / min.

[0015] Optionally, H1=25mm, Hk=5mm, Dmax=100mm, J1=50r / min.

[0016] Optionally, in the fourth control logic, if the current operating condition is a high-risk sudden change condition requiring smoke escape correction, the fan speed is adjusted according to the following steps: S201: The fan operates at a speed of 1400 r / min; S202: The rotational speed of the fan is increased to J2 speed; S203: Determine if S0 ≥ 0.86. If yes, proceed to S204; otherwise, execute the third control logic. S204: Determine whether the current speed of the fan has reached 1400 r / min. If yes, return to S203; otherwise, return to S202. Where 0 < J2 ≤ Jmax - 1400 r / min, and Jmax is the maximum speed of the fan.

[0017] Optionally, J2 = 100 r / min, and the interval between S202 and S203 is 200 ms.

[0018] Optionally, the following steps are also included during the operation of S6: S301: Determine whether S0≥0.2 is triggered, and when S0 falls from S0≥0.2 to 0<S0<0.2, S0 can remain within 0<S0<0.2 for a duration of t1 without fluctuation. If so, proceed to S302; otherwise, the range hood maintains its current operating logic. S302: Determine whether the temperature of the stove area is showing a continuous downward trend with no periodic temperature rise fluctuations and no vertical rise of oil fumes. If yes, trigger the cooking end reset condition; otherwise, return to S301. The cooking end reset condition includes the following steps: the fan runs for t2 time in the range of 700r / min to 750r / min, the top smoke gathering plate group resets to the first position, and the rear smoke gathering plate group resets to the third position; Among them, 100s≤t1≤150s, 70s≤t2≤110s.

[0019] Optionally, S6 also includes the following steps: Set Hk and J1 as velocity vectors V respectively. i H1 and H2 are respectively set as position vectors X i The following PSO algorithm logic is used for update iteration: ; ; Where t is the current iteration time, and t+1 is the next iteration time. Let be the velocity vector of the i-th group of control particles at the current iteration time. Let be the position vector of the i-th group of control particles at the current iteration time, and ω be the inertia weight. For the individual learning factor corresponding to the Kth type of working condition, Let r1 and r2 be the global learning factors corresponding to the Kth working condition, and r1 and r2 be uniform random coefficients in the interval [0,1]. best For each particle's historical optimal position, corresponding to the optimal Hk, J1, H1, H2, and G within a single iteration cycle. best The optimal position for the population is Hk, J1, H1, and H2, which correspond to the optimal positions for the entire scene. The number of particles is controlled to be n, the maximum number of iterations is m, and 10≤n≤30, 30≤n≤70. When S0≤S1, 0.6≤ω≤0.8, 1.6≤c1≤2, 1.6≤c2≤2; When S0 > S1, 0.2 ≤ ω < 0.6, 2 < c1 ≤ 2.4, 2 < c2 ≤ 2.4; And 0.3 < S1 < 0.5.

[0020] Alternatively, S1 = 0.4, and When S0≤S1, ω=0.8, c1=1.8, c2=1.8; When S0 > S1, ω = 0.4.6, c1 = 2.2, c2 = 2.2.

[0021] Optionally, it also includes self-learning logic, which includes the following steps: S401: Using D consecutive days as an iteration cycle, continuously collect the following data within one iteration cycle: the duration t3 of the range hood being in a low-risk steady-state condition with minimal oil fumes, the duration t4 of the range hood being in a steady-state condition with normal oil fumes, the duration t5 of the range hood being in a sudden change condition with high oil fumes during stir-frying, and the duration t6 of the range hood being in a sudden change condition with high risk of smoke leakage correction. t3+t4+t5+t6=tk; S402: Determine if (t3+t4) / tk>0.65, then proceed to S403; otherwise, proceed to S404. S403: Increase the value of one or more of q1, q2, and q3, and simultaneously decrease the value of one or more of q4, q5, and q6; S404: Increase the value of one or more of q4, q5, and q6, and simultaneously decrease the value of one or more of q1, q2, and q3. Among them, 3 days ≤ D ≤ 10 days.

[0022] Optionally, in S403 and / or S404, the amplitude of adjusting q1, q2, q3, q4, q5, and q6 is f, where 0 < f < 0.03.

[0023] Optionally, the following steps are also included: S501: Perform anomaly detection on the raw data Vx, Vy, C, and T; S502: Determine whether any of the original data is in an abnormal state for a continuous period of t7. If so, the data is determined to be abnormal data, and then proceed to S503 or S504, and simultaneously proceed to S505. S503: Isolate the abnormal data so that it does not participate in the calculation of S0; S504: Based on the remaining five data items and the historical data of ΔT, Vx, Vy, C, ΔC, and T, calculate the equivalent value of the abnormal data, and use the equivalent value to participate in the calculation of S0; S505: Determine whether the abnormal data recovers to the normal state within a continuous time t8. If so, the abnormal data is determined as normal data and included in the calculation of S0.

[0024] Optionally, in S502, if not any of the original data is in an abnormal state for a continuous period of t7, then proceed to the following steps: S501: Determine whether the original data Vx, Vy, C, and T are all in a normal state. If yes, the range hood executes the current control logic. If no, the range hood stops running and enters standby mode, and an alarm is issued at the same time.

[0025] Optionally, q1=q2=q3=0.24, q4=q5=q6=0.0933.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects: The range hood provided by the present invention, by setting a sensing module to collect the oil fume concentration C, oil fume ambient temperature T, oil fume lateral diffusion speed Vx and oil fume longitudinal rising speed Vy in real time, can accurately judge the oil fume situation, and then adjust the opening of the smoke inlet through the smoke collection component, so that the smoke inlet can be adapted to different working conditions. It has a simple structure and has a good smoke collection effect. Attached Figure Description

[0027] Figure 1 This is a partial cross-sectional view of the range hood provided in a specific embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of a range hood provided in a specific embodiment of the present invention (the top smoke-collecting plate assembly is in the first position, and the rear smoke-collecting plate assembly is in the third position). Figure 3 This is a three-dimensional structural diagram of a range hood provided in a specific embodiment of the present invention (the top smoke-gathering plate assembly is in the first position, and the rear smoke-gathering plate assembly is in the fourth position). Figure 4 This is a three-dimensional structural diagram of a range hood provided in a specific embodiment of the present invention (the top smoke-collecting plate assembly is in the second position, and the rear smoke-collecting plate is in the third position). Figure 5 This is a three-dimensional structural diagram of a range hood provided in a specific embodiment of the present invention (the top smoke-gathering plate assembly is in the second position, and the rear smoke-gathering plate assembly is in the fourth position). Figure 6 yes Figure 5 A partial sectional view; Figure 7 This is one of the step diagrams of the operation method of the range hood provided in a specific embodiment of the present invention; Figure 8 This is the second step diagram of the operation method of the range hood provided in a specific embodiment of the present invention.

[0028] In the picture: 1. Chassis; 11. Top cover; 111. Top smoke inlet; 12. Rear cover; 121. Rear smoke inlet; 122. Rear cover body; 123. Panel; 100. First sensor module; 20. Air cavity; 200. Second sensor module; 3. Second smoke collection plate; 30. Mesh; 4. Second drive assembly; 41. Smoke inlet gap; 5. First smoke-collecting plate; 6. First drive component; 7. Fan. Detailed Implementation

[0029] The following embodiments illustrate the present invention, but the present invention is not limited to these embodiments. Modifications to the specific embodiments of the present invention or equivalent substitutions for some technical features, without departing from the spirit of the present invention, should all be covered within the scope of the technical solutions claimed in the present invention.

[0030] Please refer to Figures 1-6This invention provides a range hood, including a housing 1, a smoke collection hood, a smoke gathering assembly, a fan 7, a sensor module assembly, and a control module. The housing 1 contains an air cavity 20. The smoke collection hood has a smoke collection chamber communicating with the air cavity 20, and an inlet communicating with the smoke collection chamber. The smoke gathering assembly is mounted on the smoke collection hood and / or the housing 1 and can move relative to the inlet to close or open the inlet to different degrees. The fan 7 is mounted inside the air cavity 20. The sensor module assembly is mounted on the smoke collection hood and is used to collect real-time data on the oil fume concentration C, the oil fume ambient temperature T, the lateral diffusion velocity Vx, and the longitudinal rising velocity Vy of the oil fume. The control module is communicatively connected to the smoke gathering assembly, the fan 7, and the sensor module assembly. The control module controls the operation of the smoke gathering assembly and / or the fan 7 based on the oil fume concentration C, the oil fume ambient temperature T, the lateral diffusion velocity Vx, and the longitudinal rising velocity Vy collected by the sensor module.

[0031] The range hood provided by this invention uses a sensor module to collect data in real time on the oil fume concentration C, the ambient temperature T, the lateral diffusion speed Vx, and the longitudinal rising speed Vy of the oil fume. This allows for a relatively accurate assessment of the oil fume situation. Furthermore, the opening of the smoke inlet can be adjusted by the smoke collection component, making the smoke inlet adaptable to different working conditions. The structure is simple and has a good smoke collection effect.

[0032] Optionally, the smoke hood includes a top cover 11 and a rear cover 12. The top cover 11 is located on the lower side of the chassis 1, and the rear cover 12 is located on the rear side of the top cover 11 and extends downward. The smoke inlet includes a top smoke inlet 111 and a rear smoke inlet 121. The smoke collection chamber includes a top smoke collection chamber and a rear smoke collection chamber. The top smoke collection chamber is provided inside the top cover 11, and the top smoke inlet 111 communicating with the top smoke collection chamber is provided on the lower side of the top cover 11. The rear smoke collection chamber is provided inside the rear cover 12, and a rear smoke collection chamber is provided on the front side of the rear cover 12. The rear smoke inlet 121 is connected to the rear smoke collection chamber. The rear smoke inlet 121 is set lower than the top smoke inlet 111. The smoke collection assembly includes a top smoke collection plate assembly and a rear smoke collection plate assembly. The top smoke collection plate assembly is installed on the smoke collection hood and / or the housing 1 and can move relative to the top smoke inlet 111 to open the top smoke inlet 111 to different opening degrees. The rear smoke collection plate assembly is installed on the smoke collection hood and / or the housing 1 and can move relative to the rear smoke inlet 121 to open the rear smoke inlet 121 to different opening degrees. By configuring the smoke collection hood into a structure including a top cover 11 and a rear cover 12, a top smoke inlet 111 is opened on the top cover 11, and a rear smoke inlet 121 is opened on the rear cover 12. The top smoke inlet 111 is conducive to absorbing the smoke flowing upward in the vertical direction, and the rear smoke inlet 121 is conducive to absorbing the smoke flowing in the horizontal direction. The opening of the top smoke inlet 111 is adjusted by the top smoke collection plate assembly, and the opening of the rear smoke inlet 121 is adjusted by the rear smoke collection plate assembly, thereby further improving the smoke collection effect.

[0033] Optionally, the sensing module assembly includes a first sensing module 100 and a second sensing module 200. The first sensing module 100 is disposed on the periphery of the rear smoke inlet 121, and the second sensing module 200 is disposed on the periphery of the top smoke inlet 111. The first sensing module 100 includes a gas-sensitive oil fume concentration sensor, an infrared non-contact temperature sensor, and a lateral wind speed sensor. The second sensing module 200 includes an infrared non-contact temperature sensor and a vertical wind speed sensor. The gas-sensitive oil fume concentration sensor is used to collect the oil fume concentration C in real time. The infrared non-contact temperature sensor is used to collect the oil fume ambient temperature T in real time. The lateral wind speed sensor is used to collect the lateral diffusion velocity Vx of the oil fume in real time. The vertical wind speed sensor is used to collect the longitudinal rising velocity Vy of the oil fume in real time. By placing the gas-sensitive oil fume concentration sensor, the infrared non-contact temperature sensor, and the lateral wind speed sensor around the rear smoke inlet 121, these sensors can be positioned close to the cooking pots on the stovetop. This allows the gas-sensitive oil fume concentration sensor to more accurately detect the concentration C of the oil fume just generated on the cooking pots, improving the detection accuracy of the oil fume concentration C. The infrared non-contact temperature sensor can detect the temperature around the cooking pots, and the lateral wind speed sensor can detect the lateral diffusion speed Vx of the oil fume flowing laterally towards the rear smoke inlet 121. By placing the infrared non-contact temperature sensor and the vertical wind speed sensor around the top smoke inlet 111, the infrared non-contact temperature sensor can detect the temperature around the top smoke inlet 111. This, combined with the infrared non-contact temperature sensor around the rear smoke inlet 121, improves the detection accuracy of the oil fume ambient temperature T. The vertical wind speed sensor can detect the vertical rising speed Vy of the oil fume flowing vertically towards the top smoke inlet 111.

[0034] Optionally, the top smoke gathering plate assembly includes a first drive assembly 6 and a first smoke gathering plate 5. The first drive assembly 6 is installed in the air cavity 20 and the top smoke gathering cavity, and the first smoke gathering plate 5 is installed at the output end of the first drive assembly 6. The first drive assembly 6 can drive the first smoke gathering plate 5 to move up and down to close or open the top smoke inlet 111 to different degrees; and / or the rear smoke gathering plate assembly includes a second drive assembly 4 and a second smoke gathering plate 3. The second drive assembly 4 is installed in the rear smoke gathering cavity, and the second smoke gathering plate 3 is installed at the output end of the second drive assembly 4. The second drive assembly 4 can drive the second smoke gathering plate 3 to move up and down to close or open the rear smoke inlet 121 to different degrees.

[0035] Optionally, the rear cover 12 includes a rear cover body 122 and a panel 123 disposed on the front side of the rear cover body 122. The rear cover body 122 and the panel 123 enclose a rear smoke collection chamber, and the rear air inlet is disposed at the lower part of the rear cover body 122 and located below the panel 123.

[0036] Please refer to Figures 1-8In another aspect, the present invention provides a method for operating a range hood as described above, comprising the following steps: S1: Range hood is on; S2: Collect the following valid raw data multiple times at regular intervals: oil fume concentration C, oil fume temperature T, oil fume lateral diffusion velocity Vx, and oil fume longitudinal rising velocity Vy; S3: The following six-dimensional characteristic parameters of oil fume are calculated: average oil fume concentration C0, concentration increment ΔC, average oil fume temperature T0, temperature rise rate ΔT, average lateral diffusion velocity of oil fume Vx0, and average longitudinal ascent velocity of oil fume Vy0. S4: Classify ΔT, Vx0, and Vy0 as high-risk mutation features, and C0, ΔC, and T0 as steady-state correction features. Assign weights q1 to ΔT, q2 to Vx0, q3 to Vy0, q4 to C0, q5 to ΔC, and q6 to T0, respectively. q1+q2+q3=Q1, q4+q5+q6=Q1, Q1>Q2, Q1+Q2=1. Perform extreme value normalization on ΔT, Vx0, Vy0, C0, ΔC, and T0 to map them to the dimensionless interval (0,1], thereby obtaining the standard values ​​X of ΔT, Vx0, Vy0, C0, ΔC, and T0. ΔT ', X Vx ', X Vy ', X C ', X ΔC ', X T '; S5: Based on X ΔT ', X Vx ', X Vy ', X C ', X ΔC ', X T ', Combining the weights of ΔT, Vx0, Vy0, C0, ΔC, and T0, a weighted sum is obtained to obtain the baseline risk score S0 located in the dimensionless interval (0,1], S0 = q1X ΔT '+ q2X Vx '+ q3 X Vy '+q4X C '+ q5 X ΔC '+ q6 X T '; S6: The top smoke-gathering plate assembly operates according to S0 to adjust the opening of the top smoke inlet; and / or the rear smoke-gathering plate assembly operates according to S0 to adjust the opening of the rear smoke inlet; and / or the fan speed is adjusted according to S0.

[0037] The operating method of the range hood provided by this invention collects oil fume concentration C, oil fume temperature T, oil fume lateral diffusion velocity Vx, and oil fume vertical rising velocity Vy, and then calculates six-dimensional oil fume characteristic parameters: average oil fume concentration C0, concentration increment ΔC, average oil fume temperature T0, temperature rise rate ΔT, average lateral diffusion velocity Vx0, and average vertical rising velocity Vy0. These six-dimensional oil fume characteristic parameters are then normalized and mapped to a dimensionless interval of (0,1) to obtain standard values. ΔT, Vx0, and Vy0 are classified as high-risk mutation features, and C0, ΔT, Vx0, and Vy0 are classified as high-risk mutation features. C and T0 are classified as steady-state correction features. Then, high-risk mutation features are assigned a higher weight than steady-state correction features. The standard values ​​of the six-dimensional data are weighted and summed with their respective weights to obtain the baseline risk score S0 in the dimensionless interval (0,1). The top smoke-gathering plate group operates according to S0 to adjust the opening of the top smoke inlet; and / or the rear smoke-gathering plate group operates according to S0 to adjust the opening of the rear smoke inlet; and / or the fan speed is adjusted according to S0, so that the opening of the top smoke inlet and the rear smoke inlet can be adjusted more precisely, and the adjustment accuracy of the fan speed of 7 can be improved, thereby improving the smoke-gathering effect of the range hood.

[0038] It should be noted that the effective raw data mentioned in S2 refers to the system continuously caching 10 frames of time-series data (each frame is 10ms). Through variance fluctuation verification, abnormal and sudden data caused by instantaneous turbulence, environmental smoke, and temperature drift are removed (that is, data that differs significantly from most data is removed). Only effective raw data that conforms to the physical laws of oil fume temperature rise, diffusion, and rising is retained, thus avoiding misjudgment and incorrect adjustment of operating conditions caused by external interference from the source.

[0039] It should be further noted that, due to the significant differences in dimensions and numerical ranges among the six-dimensional oil fume characteristic parameters, it is necessary to first map all the original data to the standard dimensionless interval (0,1] using an extreme value normalization formula to eliminate the dimensional differences. The general normalization formula is as follows: Xi'=(Xi-Xmin) / (Xmax-Xmin); Where Xi is the value of any one of the six dimensions of oil fume characteristic parameters; Xmin is the lower limit of the preset hardware detection extreme value of the corresponding dimension, and Xmax is the upper limit of the preset hardware detection extreme value of the corresponding dimension. Xmin and Xmax are fixed parameters uniformly calibrated at the factory stage of the range hood. Based on the range of range hood sensing hardware and the extreme working conditions of household cooking in all scenarios, they can completely cover the effective oil fume sensing detection range and ensure the accuracy of normalization calculation and data validity; Xi' is the normalized standard value of this dimension, and its value is strictly constrained to the range of (0,1].

[0040] Optionally, the top smoke-gathering plate assembly can move between a first position and a second position. When the top smoke-gathering plate assembly is in the first position, the smoke-inlet area of ​​the top smoke inlet 111 is W1, and when the top smoke-gathering plate assembly is in the second position, the smoke-inlet area of ​​the top smoke inlet 111 is W2, where 0 < W1 < W2. The rear smoke-gathering plate assembly can move between a third position and a fourth position. When the smoke-gathering plate assembly is in the third position, the smoke-inlet area of ​​the rear smoke inlet 121 is W3, and when the rear smoke-gathering plate assembly is in the fourth position, the smoke-inlet area of ​​the rear smoke inlet 121 is W4, where 0 < W3 < W4.

[0041] Optionally, the top smoke baffle assembly can move up and down between a first position and a second position, with the first position being higher than the second position, and the rear smoke baffle assembly can move up and down between a third position and a fourth position, with the fourth position being higher than the third position.

[0042] Optionally, the lower part of the panel 123 is provided with a plurality of mesh holes 30, the total area of ​​the plurality of mesh holes 30 being W3. When the rear smoke gathering plate assembly is in the third position, the mesh holes 30 are connected to the rear smoke gathering cavity.

[0043] Optionally, when the fixed smoke-gathering plate assembly is in the first position, there is a smoke-inlet gap 41 between the first smoke-gathering plate 5 and the periphery of the top smoke inlet 111, and the area of ​​the smoke-inlet gap 41 is W1.

[0044] Optionally, S6 includes the following four control logics: The first control logic is as follows: when 0 < S0 < 0.2, and C ≤ 0.3 mg / m³, ΔC ≤ 0.01 mg / m³ within any 10 ms, T ≤ 45℃, ΔT ≤ 0.5℃ within any 10 ms, Vx ≤ 2 cm / s, and Vy ≤ 3 cm / s, the current working condition is determined to be a low-risk steady-state working condition with minimal oil fume. The top smoke collection plate group is in the first position, the rear smoke collection plate group is in the third position, and the speed of the fan 7 is in the range of 600 r / min to 650 r / min. The second control logic is as follows: When 0.2 ≤ S0 < 0.4, and 0.3 < C ≤ 0.8 mg / m³, within any 10 ms, 0.01 < ΔC ≤ 0.03 mg / m³, 45 < T ≤ 65℃, and within any 10 ms, 0.5 < ΔT ≤ 1.2℃, the current operating condition is determined to be a normal steady-state operating condition for oil fumes. Under this condition, when 3 cm / s < Vy ≤ 6 cm / s and Vx ≤ 3 cm / s, it indicates that the upward trend of oil fumes is obvious and the horizontal overflow is weak. At this time, the top smoke plate assembly descends by the first distance H. 1. When the rear smoke collection plate group is in the third position and the speed of the fan 7 is in the range of 600r / min to 900r / min, when Vy≤3cm / s and 3<Vx≤6cm / s, it indicates that the oil fumes rise weakly and there is no obvious vertical overflow, but the horizontal diffusion trend of the pot opening is prominent. This is often seen in scenarios such as shallow water boiling, slow stir-frying, and food simmering. There is a risk of hidden side smoke escape. At this time, the top smoke collection plate group is in the first position and the rear smoke collection plate group is in the fourth position to facilitate the absorption of horizontally diffused oil fumes. H1>0. The third control logic is as follows: when 0.4≤S0<0.85, and 0.8<C≤1.5mg / m³, within any 10ms, 0.03<ΔC≤0.08mg / m³, 65<T≤90℃, within any 10ms, 1.2<ΔT≤3℃, 3cm / s<Vx≤6cm / s, 6cm / s<Vy≤12cm / s, it is determined that the current working condition belongs to the sudden change condition of high oil fume during stir-frying. The top smoke gathering plate group descends by the second distance H2, the rear smoke gathering plate group is in the fourth position, the speed of the fan 7 is in the range of 1100r / min to 1400r / min, Dmax>H2>H1, and Dmax is the distance between the first position and the second position; The fourth control logic is as follows: when 0.85≤S0≤1, and C>1.5mg / m³, ΔC>0.08mg / m³ within any 10ms, T>90℃, ΔT>3℃ within any 10ms, Vx>6cm / s, and Vy>12cm / s, the current working condition is judged to be a high-risk sudden change working condition for smoke escape correction. The top smoke gathering plate group is in the second position, the rear smoke gathering plate group is in the fourth position, and the speed of fan 7 is in the range of 1400r / min to 1800r / min.

[0045] Optionally, in the second control logic, if the current operating condition is a normal oil fume steady-state operating condition, when 0.2≤S0<0.3, the speed of fan 7 is in the range of 600r / min to 750r / min, and when 0.3≤S0<0.4, the speed of fan 7 is in the range of 750r / min to 900r / min, so as to further adjust the speed of fan 7 to be adapted to the current operating condition.

[0046] Optionally, in the third control logic, if the current operating condition is a sudden change in high-fume stir-frying conditions, the following steps are executed: S101: Fan 7 is running at a speed of 1100r / min, the rear smoke collection plate group is in the fourth position, and the top smoke collection plate group is lowered to the first distance H1; S102: The top smoke-collecting plate assembly descends by a distance of Hk; S103: Determine if S0≥0.4. If yes, proceed to S104; otherwise, run the second control logic. S104: Determine if H2 = Dmax. If yes, proceed to S105; otherwise, return to S102. S105: Increase the speed of fan 7 to the speed of J1; S106: Determine if S0≥0.4. If yes, proceed to S107; otherwise, run the second control logic. S107: Determine whether the current speed of fan 7 has reached 1400 r / min. If yes, run the fourth control logic. If no, return to S105. Where 0 < Hk ≤ Dmax - H1, 0 < J1 ≤ 1400 r / min - 1100 r / min.

[0047] Optionally, H1=25mm, Hk=5mm, Dmax=100mm, J1=50r / min.

[0048] Thus, in this embodiment, when the operating condition is a sudden change in high oil fume during stir-frying, the core control logic is to prioritize the gradual expansion of the top smoke inlet 111, while the fan 7's wind speed is adjusted with a lagging gradient to compensate, completely different from the traditional synchronous adjustment mode of attitude and air volume. After entering the sudden change in high oil fume during stir-frying, the system prioritizes locking the fan 7 speed at 1100 r / min, and prioritizes adjusting the top smoke-collecting plate assembly to gradually increase the downward displacement in 5 mm increments, gradually widening the negative pressure coverage area of ​​the top smoke inlet 111, strengthening the physical sealing effect of oil fumes, optimizing the suppression of oil fume diffusion, and minimizing the increase in noise and energy consumption caused by high-speed operation. The entire process uses mechanical smoke control as the core means. Only when the attitude adjustment of the top smoke-collecting plate assembly reaches its limit position and the oil fume risk has not been eliminated, the fan 7 is then started to supplement the speed in a gradient of 50 r / min increments, precisely making up for the smoke control gap due to insufficient negative pressure. The control logic first relies on the posture adjustment of the top and rear smoke-gathering plate groups to solve most of the problem of oil fume overflow during stir-frying, and then supplements it with a small increase in air volume to achieve the ultimate balance of smoke control, noise reduction and energy consumption in stir-frying scenarios.

[0049] Optionally, in the fourth control logic, if the current operating condition is a high-risk sudden change condition for smoke escape correction, the speed of fan 7 is adjusted according to the following steps: S201: Fan 7 operates at a speed of 1400 r / min; S202: Increase the speed of fan 7 to J2 speed; S203: Determine if S0≥0.86. If yes, proceed to S204. If no, run the third control logic. S204: Determine whether the current speed of fan 7 has reached 1400 r / min. If yes, return to S203; otherwise, return to S202. Where 0 < J2 ≤ Jmax - 1400 r / min, and Jmax is the maximum speed of fan 7.

[0050] In this way, the fan speed is gradually increased according to the intensity of the smoke escape risk, so as to quickly offset the trend of oil fume diffusion with the minimum air volume increase, eliminate continuous smoke escape in extreme scenarios, and avoid the high energy consumption and high noise problems caused by running at full speed throughout the process.

[0051] Optionally, J2 = 100 r / min, and the interval between S202 and S203 is 200 ms, to obtain relatively stable raw data in six dimensions after adjusting the speed.

[0052] Optionally, the following steps are also included during the operation of S6: S301: Determine whether S0≥0.2 is triggered, and when S0 falls from S0≥0.2 to 0<S0<0.2, S0 can remain within 0<S0<0.2 for a duration of t1 without fluctuation. If so, proceed to S302; otherwise, the range hood maintains its current operating logic. S302: Determine whether the temperature of the stove area is showing a continuous downward trend with no periodic temperature rise fluctuations and no vertical rise of oil fumes. If yes, trigger the cooking end reset condition; otherwise, return to S301. The cooking end reset condition includes the following steps: the fan 7 runs for t2 time in the range of 700r / min to 750r / min, the top smoke gathering plate group resets to the first position, and the rear smoke gathering plate group resets to the third position; Among them, 100s≤t1≤150s, 70s≤t2≤110s.

[0053] In this way, the range hood can be automatically reset.

[0054] In this embodiment, t1 = 120s and t2 = 90s.

[0055] Optionally, S6 also includes the following steps: Set Hk and J1 as velocity vectors V respectively. i H1 and H2 are respectively set as position vectors X i The following PSO algorithm logic is used for update iteration: ; ; Where t is the current iteration time, and t+1 is the next iteration time. Let be the velocity vector of the i-th group of control particles at the current iteration time. Let be the position vector of the i-th group of control particles at the current iteration time, and ω be the inertia weight. For the individual learning factor corresponding to the Kth type of working condition, Let r1 and r2 be the global learning factors corresponding to the Kth working condition, and r1 and r2 be uniform random coefficients in the interval [0,1]. best For each particle's historical optimal position, corresponding to the optimal Hk, J1, H1, H2, and G within a single iteration cycle. best The optimal position for the population is Hk, J1, H1, and H2, which correspond to the optimal positions for the entire scene. The number of particles is controlled to be n, the maximum number of iterations is m, and 10≤n≤30, 30≤n≤70. When S0≤S1, 0.6≤ω≤0.8, 1.6≤c1≤2, 1.6≤c2≤2; When S0 > S1, 0.2 ≤ ω < 0.6, 2 < c1 ≤ 2.4, 2 < c2 ≤ 2.4; And 0.3 < S1 < 0.5.

[0056] Thus, by iterating over Hk, J1, H1, and H2, the optimal solutions for Hk, J1, H1, and H2 are obtained, thereby optimizing the smoke collection effect.

[0057] Optionally, in this embodiment, S1=0.4, and When S0≤S1, ω=0.8, c1=1.8, c2=1.8; When S0 > S1, ω = 0.4.6, c1 = 2.2, c2 = 2.2.

[0058] Optionally, it also includes self-learning logic, which includes the following steps: S401: Using D consecutive days as an iteration cycle, continuously collect the following data within one iteration cycle: the duration t3 of the range hood being in a low-risk steady-state condition with minimal oil fumes, the duration t4 of the range hood being in a steady-state condition with normal oil fumes, the duration t5 of the range hood being in a sudden change condition with high oil fumes during stir-frying, and the duration t6 of the range hood being in a sudden change condition with high risk of smoke leakage correction. t3+t4+t5+t6=tk; S402: Determine if (t3+t4) / tk>0.65, then proceed to S403; otherwise, proceed to S404. S403: Increase the value of one or more of q1, q2, and q3, and simultaneously decrease the value of one or more of q4, q5, and q6; S404: Increase the value of one or more of q4, q5, and q6, and simultaneously decrease the value of one or more of q1, q2, and q3. Among them, 3 days ≤ D ≤ 10 days.

[0059] In this way, through the system's self-learning, the range hood can further match the weights of the six-dimensional raw data according to the user's usage habits, thereby improving the smoke collection effect.

[0060] In this embodiment, D = 7 days.

[0061] Optionally, in S403 and / or S404, the adjustment range of q1, q2, q3, q4, q5, and q6 is f, where 0 < f < 0.03, to avoid excessive adjustment range of q1, q2, q3, q4, q5, and q6 and to ensure the stability of system operation.

[0062] Optionally, the following steps are also included: S501: Perform anomaly detection on the raw data Vx, Vy, C, and T; S502: Determine whether any of the original data is in an abnormal state for a continuous period of t7. If so, the data is determined to be abnormal data, and then proceed to S503 or S504, and simultaneously proceed to S505. S503: Isolate the abnormal data so that it does not participate in the calculation of S0; S504: Based on the remaining five data items and the historical data of ΔT, Vx, Vy, C, ΔC, and T, calculate the equivalent value of the abnormal data, and use the equivalent value to participate in the calculation of S0; S505: Determine whether the abnormal data recovers to the normal state within a continuous time t8. If so, the abnormal data is determined as normal data and included in the calculation of S0.

[0063] Specifically, in S502, the method for determining that any original data is in an abnormal state for a continuous time period t7 includes: during the time period t7, performing four checks on the original data Vx, Vy, C, and T respectively, checking for amplitude exceeding limits, abnormal rate of change, data jamming, and numerical drift. If any original data deviates from the preset value, then the latitude data is determined to be in an abnormal state.

[0064] Furthermore, in this embodiment, t7 = 10ms and t8 = 30ms.

[0065] Optionally, in S502, if none of the latitude data is in an abnormal state for a continuous time period t7, then proceed to the following steps: S501: Determine whether the original data Vx, Vy, C, and T are all in a normal state. If yes, the range hood executes the current control logic. If no, the range hood stops running and enters standby mode, and an alarm is issued at the same time.

[0066] Thus, when anomalies occur in two or more dimensions of the original six-dimensional data, the range hood will stop operating and enter standby mode, while simultaneously issuing an alarm to avoid false control due to extreme anomalies and ensure equipment safety.

[0067] Optionally, q1=q2=q3=0.24, q4=q5=q6=0.0933.

[0068] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A range hood, characterized in that, include: The chassis (2) has an air chamber (20) inside. A smoke collection hood (1) has a smoke collection chamber inside that communicates with the air cavity (20), and a smoke inlet on the smoke collection hood (1) that communicates with the smoke collection chamber; A smoke collection assembly is installed on the smoke collection hood (1) and / or the chassis (2) and is movable relative to the smoke inlet to close or open the smoke inlet to different degrees; A fan (7) is installed inside the air cavity (20); The sensing module assembly is installed on the fume hood (1) and is used to collect the fume concentration C, fume ambient temperature T, fume lateral diffusion velocity Vx and fume longitudinal rising velocity Vy in real time. The control module is communicatively connected to the smoke collection component, the fan (7) and the sensing module component. The control module is used to control the operation of the smoke collection component and / or the fan (7) based on the oil fume concentration C, oil fume ambient temperature T, oil fume lateral diffusion velocity Vx and oil fume longitudinal rising velocity Vy collected by the sensing module.

2. The range hood according to claim 1, characterized in that, The smoke collection hood (1) includes a top cover (11) and a rear cover (12). The top cover (11) is located on the lower side of the chassis (2), and the rear cover (12) is located on the rear side of the top cover (11) and extends downward. The smoke inlet includes a top smoke inlet (111) and a rear smoke inlet (121). The smoke collection chamber includes a top smoke collection chamber and a rear smoke collection chamber. The top smoke collection chamber is provided inside the top cover (11), and the top smoke inlet (111) communicating with the top smoke collection chamber is provided on the lower side of the top cover (11). The rear smoke collection chamber is provided inside the rear cover (12), and the front side of the rear cover (12) has an opening. The rear smoke inlet (121) is connected to the rear smoke collection chamber. The rear smoke inlet (121) is set lower than the top smoke inlet (111). The smoke collection assembly includes a top smoke collection plate group and a rear smoke collection plate group. The top smoke collection plate group is installed on the smoke collection hood (1) and / or the chassis (2) and can move relative to the top smoke inlet (111) to open the top smoke inlet (111) to different opening degrees. The rear smoke collection plate group is installed on the smoke collection hood (1) and / or the chassis (2) and can move relative to the rear smoke inlet (121) to open the rear smoke inlet (121) to different opening degrees.

3. The range hood according to claim 2, characterized in that, The sensing module assembly includes a first sensing module (100) and a second sensing module (200). The first sensing module (100) is disposed on the periphery of the rear smoke inlet (121), and the second sensing module (200) is disposed on the periphery of the top smoke inlet (111). The first sensing module (100) includes a gas-sensitive oil fume concentration sensor, an infrared non-contact temperature sensor, and a lateral wind speed sensor. The second sensing module (200) includes an infrared non-contact temperature sensor and a vertical wind speed sensor. The gas-sensitive oil fume concentration sensor is used to collect the oil fume concentration C in real time. The infrared non-contact temperature sensor is used to collect the oil fume ambient temperature T in real time. The lateral wind speed sensor is used to collect the oil fume lateral diffusion velocity Vx in real time. The vertical wind speed sensor is used to collect the oil fume longitudinal rising velocity Vy in real time.

4. The range hood according to claim 2, characterized in that, The top smoke gathering plate assembly includes a first drive assembly (6) and a first smoke gathering plate (5). The first drive assembly (6) is installed in the air cavity (20) and the top smoke gathering cavity. The first smoke gathering plate (5) is installed at the output end of the first drive assembly (6). The first drive assembly (6) can drive the first smoke gathering plate (5) to move up and down to close or open the top smoke inlet (111) to different degrees. And / or the rear smoke gathering plate assembly includes a second drive assembly (4) and a second smoke gathering plate (3). The second drive assembly (4) is installed in the rear smoke gathering cavity. The second smoke gathering plate (3) is installed at the output end of the second drive assembly (4). The second drive assembly (4) can drive the second smoke gathering plate (4) to move up and down to close or open the rear smoke inlet (121) to different degrees.

5. A method for operating a range hood as described in any one of claims 2-4, characterized in that, Includes the following steps: S1: Range hood is on; S2: Collect the following valid raw data multiple times at regular intervals: oil fume concentration C, oil fume temperature T, oil fume lateral diffusion velocity Vx, and oil fume longitudinal rising velocity Vy; S3: The following six-dimensional characteristic parameters of oil fume are calculated: average oil fume concentration C0, concentration increment ΔC, average oil fume temperature T0, temperature rise rate ΔT, average lateral diffusion velocity of oil fume Vx0, and average longitudinal ascent velocity of oil fume Vy0. S4: Classify ΔT, Vx0, and Vy0 as high-risk mutation features, and C0, ΔC, and T0 as steady-state correction features. Assign weights q1 to ΔT, q2 to Vx0, q3 to Vy0, q4 to C0, q5 to ΔC, and q6 to T0, respectively. q1+q2+q3=Q1, q4+q5+q6=Q1, Q1>Q2, Q1+Q2=1. Perform extreme value normalization on the original data of ΔT, Vx, Vy, C, ΔC, and T to map ΔT, Vx0, Vy0, C0, ΔC, and T0 to the dimensionless interval (0,1], thereby obtaining the standard values ​​X of ΔT, Vx0, Vy0, C0, ΔC, and T0. ΔT ', X Vx ', X Vy ', X C ', X ΔC ', X T '; S6: Based on X ΔT ', X Vx ', X Vy ', X C ', X ΔC ', X T ', Combining the weights of ΔT, Vx0, Vy0, C0, ΔC, and T0, a weighted sum is obtained to obtain the baseline risk score S0 located in the dimensionless interval (0,1], S0 = q1X ΔT '+ q2X Vx '+ q3 X Vy '+q4X C '+ q5 X ΔC '+ q6 X T '; S6: The top smoke gathering plate group operates according to S0 to adjust the opening of the top smoke inlet (111); and / or the rear smoke gathering plate group operates according to S0 to adjust the opening of the rear smoke inlet (121); and / or adjust the speed of the fan (7) according to S0.

6. The operating method of the range hood according to claim 5, characterized in that, The top smoke-gathering plate assembly can move between a first position and a second position. When the top smoke-gathering plate assembly is in the first position, the smoke-inlet area of ​​the top smoke inlet (111) is W1. When the top smoke-gathering plate assembly is in the second position, the smoke-inlet area of ​​the top smoke inlet (111) is W2, 0 < W1 < W2. The rear smoke-gathering plate assembly can move between a third position and a fourth position. When the smoke-gathering plate assembly is in the third position, the smoke-inlet area of ​​the rear smoke inlet (121) is W3. When the rear smoke-gathering plate assembly is in the fourth position, the smoke-inlet area of ​​the rear smoke inlet (121) is W4, 0 < W3 < W4.

7. The operating method of the range hood according to claim 6, characterized in that, The top smoke-gathering plate assembly can move up and down between a first position and a second position, where the first position is higher than the second position. The rear smoke-gathering plate assembly can move up and down between a third position and a fourth position, where the fourth position is higher than the third position.

8. The operating method of the range hood according to claim 7, characterized in that, S6 includes the following four control logics: The first control logic: when 0 < S0 < 0.2, and C ≤ 0.3 mg / m³ 3 Within any 10ms, ΔC ≤ 0.01mg / m 3 When T≤45℃, ΔT≤0.5℃, Vx≤2cm / s, and Vy≤3cm / s within any 10ms, the current working condition is determined to be a low-risk steady-state working condition with minimal oil fume. The top smoke-collecting plate group is located at the first position, the rear smoke-collecting plate group is located at the third position, and the speed of the fan (7) is within the range of 600r / min to 650r / min. The second control logic: when 0.2 ≤ S0 < 0.4, and 0.3 < C ≤ 0.8 mg / m³ 3 Within any 10ms, 0.01 < ΔC ≤ 0.03 mg / m 3 When 45 < T ≤ 65℃ and within any 10ms, 0.5 < ΔT ≤ 1.2℃, it is determined that the current working condition belongs to the conventional oil fume steady-state working condition. Under this working condition, when 3cm / s < Vy ≤ 6cm / s and Vx ≤ 3cm / s, the top smoke gathering plate group descends by the first distance H1, the rear smoke gathering plate group is at the third position, and the speed of the fan (7) is in the range of 600r / min to 900r / min. When Vy ≤ 3cm / s and 3 < Vx ≤ 6cm / s, the top smoke gathering plate group is at the first position, the rear smoke gathering plate group is at the fourth position, and H1 > 0. The third control logic: when 0.4 ≤ S0 < 0.85, and 0.8 < C ≤ 1.5 mg / m³ 3 Within any 10ms, 0.03 < ΔC ≤ 0.08 mg / m³ 3 When 65<T≤90℃, within any 10ms, 1.2<ΔT≤3℃, 3cm / s<Vx≤6cm / s, 6cm / s<Vy≤12cm / s, it is determined that the current working condition belongs to the high oil fume sudden change working condition of stir-frying, the top smoke gathering plate group descends by the second distance H2, the rear smoke gathering plate group is at the fourth position, the speed of the fan (7) is in the range of 1100r / min to 1400r / min, Dmax>H2>H1, and Dmax is the distance between the first position and the second position; The fourth control logic: when 0.85≤S0≤1 and C>1.5mg / m³ 3 Within any 10ms, ΔC > 0.08 mg / m 3 When T > 90℃, ΔT > 3℃, Vx > 6cm / s, and Vy > 12cm / s within any 10ms, it is determined that the current working condition belongs to the high-risk sudden change working condition of smoke escape correction. The top smoke gathering plate group is in the second position, the rear smoke gathering plate group is in the fourth position, and the speed of the fan (7) is in the range of 1400r / min to 1800r / min.

9. The operating method of the range hood according to claim 8, characterized in that, In the second type of control logic, if the current working condition is a normal oil fume steady-state working condition, when 0.2≤S0<0.3, the speed of the fan (7) is in the range of 600r / min to 750r / min, and when 0.3≤S0<0.4, the speed of the fan (7) is in the range of 750r / min to 900r / min.

10. The operating method of the range hood according to claim 8, characterized in that, In the third type of control logic, if the current operating condition is a sudden change in high oil fume levels during stir-frying, then the following steps are executed: S101: The fan (7) runs at a speed of 1100r / min, the rear smoke gathering plate group is in the fourth position, and the top smoke gathering plate group is lowered to the first distance H1; S102: The top smoke-collecting plate assembly descends a distance of Hk; S103: Determine if S0≥0.

4. If yes, proceed to S104. If no, run the second type of control logic. S104: Determine if H2 = Dmax. If yes, proceed to S105; otherwise, return to S102. S105: The rotational speed of the fan (7) is increased by J1 speed; S106: Determine if S0≥0.

4. If yes, proceed to S107. If no, run the second type of control logic. S107: Determine whether the current speed of the fan (7) has reached 1400 r / min. If yes, run the fourth control logic. If no, return to S105. Where 0 < Hk ≤ Dmax - H1, 0 < J1 ≤ 1400 r / min - 1100 r / min.

11. The operating method of the range hood according to claim 10, characterized in that, H1=25mm, Hk=5mm, Dmax=100mm, J1=50r / min.

12. The operating method of the range hood according to claim 10, characterized in that, In the fourth control logic, if the current operating condition is a high-risk sudden change condition for smoke escape correction, the speed of the fan (7) is adjusted according to the following steps: S201: The fan (7) operates at a speed of 1400 r / min; S202: The rotational speed of the fan (7) is increased to J2 speed; S203: Determine if S0 ≥ 0.

86. If yes, proceed to S204; otherwise, execute the third control logic. S204: Determine whether the current speed of the fan (7) has reached 1400 r / min. If yes, return to S203; otherwise, return to S202. Where 0 < J2 ≤ Jmax - 1400 r / min, Jmax is the maximum speed of the fan (7).

13. The operating method of the range hood according to claim 12, characterized in that, J2=100r / min, and the interval between S202 and S203 is 200ms.

14. The operating method of the range hood according to claim 8, characterized in that, The S6 process also includes the following steps: S301: Determine whether S0≥0.2 is triggered, and when S0 falls from S0≥0.2 to 0<S0<0.2, S0 can remain within 0<S0<0.2 for a duration of t1 without fluctuation. If so, proceed to S302; otherwise, the range hood maintains its current operating logic. S302: Determine whether the temperature of the stove area is showing a continuous downward trend with no periodic temperature rise fluctuations and no vertical rise of oil fumes. If yes, trigger the cooking end reset condition; otherwise, return to S301. The cooking end reset condition includes the following steps: the fan (7) runs for t2 time in the range of 700r / min to 750r / min, the top smoke gathering plate group is reset to the first position, and the rear smoke gathering plate group is reset to the third position; Among them, 100s≤t1≤150s, 70s≤t2≤110s.

15. The operating method of the range hood according to claim 12, characterized in that, S6 also includes the following steps: Set Hk and J1 as velocity vectors V respectively. i H1 and H2 are respectively set as position vectors X i The following PSO algorithm logic is used for update iteration: ； ； Where t is the current iteration time, and t+1 is the next iteration time. Let be the velocity vector of the i-th group of control particles at the current iteration time. Let be the position vector of the i-th group of control particles at the current iteration time, and ω be the inertia weight. For the individual learning factor corresponding to the Kth type of working condition, Let r1 and r2 be the global learning factors corresponding to the Kth working condition, and r1 and r2 be uniform random coefficients in the interval [0,1]. best For each particle's historical optimal position, corresponding to the optimal Hk, J1, H1, H2, and G within a single iteration cycle. best The optimal position for the population is Hk, J1, H1, and H2, which correspond to the optimal positions for the entire scene. The number of particles is controlled to be n, the maximum number of iterations is m, and 10≤n≤30, 30≤n≤70. When S0≤S1, 0.6≤ω≤0.8, 1.6≤c1≤2, 1.6≤c2≤2; When S0 > S1, 0.2 ≤ ω < 0.6, 2 < c1 ≤ 2.4, 2 < c2 ≤ 2.4; And 0.3 < S1 < 0.

5.

16. The operating method of the range hood according to claim 15, characterized in that, S1=0.4, and When S0≤S1, ω=0.8, c1=1.8, c2=1.8; When S0 > S1, ω = 0.4.6, c1 = 2.2, c2 = 2.

2.

17. The method for operating a range hood according to claim 10, characterized in that, It also includes self-learning logic, which includes the following steps: S401: Using D consecutive days as an iteration cycle, continuously collect the following data within one iteration cycle: the duration t3 of the range hood being in a low-risk steady-state condition with minimal oil fumes, the duration t4 of the range hood being in a steady-state condition with normal oil fumes, the duration t5 of the range hood being in a sudden change condition with high oil fumes during stir-frying, and the duration t6 of the range hood being in a sudden change condition with high risk of smoke leakage correction. t3+t4+t5+t6=tk; S402: Determine if (t3+t4) / tk>0.65, then proceed to S403; otherwise, proceed to S404. S403: Increase the value of one or more of q1, q2, and q3, and simultaneously decrease the value of one or more of q4, q5, and q6; S404: Increase the value of one or more of q4, q5, and q6, and simultaneously decrease the value of one or more of q1, q2, and q3. Among them, 3 days ≤ D ≤ 10 days.

18. The method for operating a range hood according to claim 17, characterized in that, In S403 and / or S404, the adjustment amplitude of q1, q2, q3, q4, q5, and q6 is f, where 0 < f < 0.

03.

19. The operating method of the range hood according to claim 5, characterized in that, It also includes the following steps: S501: Perform anomaly detection on the raw data Vx, Vy, C, and T; S502: Determine whether any of the original data is in an abnormal state for a continuous period of t7. If so, the data is determined to be abnormal data, and then proceed to S503 or S504, and simultaneously proceed to S505. S503: Isolate the abnormal data so that it does not participate in the calculation of S0; S504: Based on the remaining five data items and the historical data of ΔT, Vx, Vy, C, ΔC, and T, calculate the equivalent value of the abnormal data, and use the equivalent value to participate in the calculation of S0; S505: Determine whether the abnormal data recovers to the normal state within a continuous time t8. If so, the abnormal data is determined as normal data and included in the calculation of S0.

20. The operating method of the range hood according to claim 19, characterized in that, In S502, if none of the original data is in an abnormal state for a continuous period of t7, then proceed to the following steps: S501: Determine whether the original data Vx, Vy, C, and T are all in a normal state. If yes, the range hood executes the current control logic. If no, the range hood stops running and enters standby mode, and an alarm is issued at the same time.

21. The operating method of the range hood according to claim 5, characterized in that, q1=q2=q3=0.24, q4=q5=q6=0.0933.

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