Range hood and operation control method thereof

Abstract

The invention relates to a range hood and an operation control method thereof.The range hood comprises a machine body, an air inlet is formed in the front side of the machine body, a draught fan and a controller are arranged in the machine body, and an air inlet channel is further formed in the machine body. A first temperature sensor and a second temperature sensor are arranged on the front side and the rear side of the heating metal wire, a third temperature sensor used for measuring the environment temperature is further arranged on the machine body, the heating metal wire is electrically connected with the controller, and the first temperature sensor, the second temperature sensor and the third temperature sensor are all electrically connected with the controller. And the controller performs a constant power control mode and a constant temperature difference control mode on the heating power of the heating metal wire at different time intervals so as to detect the oil smoke concentration and the airflow speed. Compared with the prior art, the device is high in precision and low in cost, does not need to additionally install a flow sensor and a concentration detection sensor, and can simultaneously measure the oil smoke concentration and the airflow speed.

Description

Technical Field

[0001] The present invention relates to a kitchen appliance, in particular to a range hood and an operation control method thereof. Background Art

[0002] A range hood is an essential electrical appliance for sucking cooking fumes during daily cooking. Products with functions such as stove-hood linkage or intelligent start-up and air volume adjustment have become increasingly popular in recent years. On the one hand, for some stove-hood linkage package products, such products often only start the range hood based on the opening of the stove, and cannot effectively identify the actual changes in cooking fumes. The detection of the fume concentration also requires an additional fume concentration sensor for detection. Products with fume detection functions often use a light sensor to detect the fume concentration, that is, simply utilize the principle that cooking fumes affect the refractive index of light in the air to judge the size of the cooking fumes, and then control the fan speed according to the fume concentration, with a slow response speed. However, in the actual use process, the changes in the fume situation are complex. During the operation of the range hood, the real-time correlation between the air flow velocity and the fume concentration cannot be obtained, which is likely to cause poor fume suction effect or excessive fan noise. In this case, an additional flow sensor needs to be used to judge whether the current fume concentration matches the air flow velocity, resulting in high costs and low intelligence. Therefore, the existing technology needs to be further improved. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a range hood and an operation control method thereof with high precision, low cost, without the need for additional installation of a flow sensor and a concentration detection sensor, and capable of simultaneously measuring the fume concentration and the air flow velocity in view of the above-mentioned prior art.

[0004] The technical solution adopted by the present invention to solve the above technical problem is as follows: A range hood includes a body, an air inlet is provided on the front side of the body, a fan is provided inside the body, a controller for controlling the fan speed is also provided inside the body, and an air inlet passage connecting the air inlet and the fan is further provided inside the body. It is characterized in that: A heating wire is provided in the air inlet passage near the air inlet inside the body, a first temperature sensor is provided in front of the heating wire, a second temperature sensor is provided behind the heating wire, and a third temperature sensor for measuring the ambient temperature is further provided on the body. The heating wire is electrically connected to the controller, and the controller can output a control signal to control the heating power of the heating wire; The first temperature sensor, the second temperature sensor and the third temperature sensor are all electrically connected to the controller; The controller realizes the detection of the fume concentration and the air flow velocity by executing the following two control modes for the heating power of the heating wire at different time intervals:

[0005] The first control mode: a constant power control mode for detecting the fume concentration;

[0006] The controller controls the heating power of the heating wire to a constant value P. At this time, the controller obtains the temperature T of the heating wire through the RTD method h , and obtains the ambient temperature T through the third temperature sensor a , and takes the temperature T of the heating wire h and the ambient temperature T a to obtain the temperature difference value ΔT conc = T h - T a ; The oil fume concentration ρ is obtained through the following formula:

[0007]

[0008] where λair is the thermal conductivity of air, which is a constant; λ oil is the thermal conductivity of the oil mist, which is a constant; λ mix is the mixed thermal conductivity of the flue gas;

[0009]

[0010] A is the cross-sectional area of the heating wire, L is the length of the heating wire, and P is the constant heating power passing through the heating wire; ΔT conc = T h - T a ;

[0011] Second control mode: Constant temperature difference control mode detection to detect the air flow velocity;

[0012] The controller collects the temperature values T1 and T2 of the first temperature sensor and the second temperature sensor in real time, and adjusts the heating power P passing through the heating wire in real time 实 , so that T1 - T2 is constantly maintained at ΔT1, and ΔT1 is a preset constant;

[0013] The controller obtains the air flow velocity V = kP through the following formula 实 , where k is a preset constant.

[0014] The controller classifies the current cooking scenario according to the detected oil fume concentration value and air flow velocity, and controls the fan speed according to different classification situations.

[0015] Preferably, the heating wire is arranged at the central position of the air inlet channel.

[0016] The operation control method of the range hood with the above structure is characterized in that: after the range hood is started and running, the controller executes two control modes for the heating power of the heating wire at time intervals to obtain the oil fume concentration ρ and the air flow velocity V. If the oil fume concentration ρ is greater than ρ1, the controller first adjusts the fan speed gear to the preset default gear, and then compares the oil fume concentration ρ with the preset segmented reference values. If ρ is less than ρ2, it is determined that the current cooking scenario is a small oil fume scenario; if ρ is greater than or equal to ρ2 and less than or equal to ρ3, it is determined that the current cooking scenario is a medium oil fume scenario; if ρ is greater than ρ3, it is determined that the current cooking scenario is a large oil fume scenario; then the air flow velocity range Va~Vb corresponding to the current cooking scenario is obtained, that is, the small oil fume scenario corresponds to a group of air flow velocity ranges Va~Vb, the medium oil fume scenario corresponds to a group of air flow velocity ranges Va~Vb, and the large oil fume scenario corresponds to a group of air flow velocity ranges Va~Vb; the air flow velocity V is compared with Va and Vb. If V is less than Va, the controller increases the fan speed gear; if V is greater than or equal to Va and less than or equal to Vb, the current fan speed gear is maintained; if V is greater than Vb, the controller decreases the fan speed gear.

[0017] As an improvement, there are two heating wires, and two groups of corresponding first temperature sensors and second temperature sensors are provided. The two groups of first temperature sensors and second temperature sensors are respectively arranged on the front side and the rear side of the two heating wires; the two heating wires are respectively arranged at the central positions of the left air inlet channel and the right air inlet channel corresponding to the air inlet. The controller respectively executes two heating power control modes for the two heating wires at time intervals to respectively obtain the oil fume concentration value and the air flow velocity in the left air inlet channel, and the oil fume concentration value and the air flow velocity in the right air inlet channel.

[0018] Further improvement, in the air inlet channel near the air inlet inside the body, there are left smoke guide plates and right smoke guide plates arranged movably. The lower sides of the left smoke guide plates and the right smoke guide plates are rotatably connected to the body, and the upper ends of the left smoke guide plates and the right smoke guide plates are free rotation ends. The left smoke guide plates and the right smoke guide plates together can cover the entire length direction of the air inlet. The left smoke guide plates and the right smoke guide plates are respectively drivenly connected to the left smoke guide plate driving module and the right smoke guide plate driving module. The left smoke guide plates and the right smoke guide plates can respectively change their angles relative to the air inlet under the drive of the left smoke guide plate driving module and the right smoke guide plate driving module; the left smoke guide plate driving module and the right smoke guide plate driving module are communicatively connected to the controller.

[0019] Further improvement, the controller classifies the current cooking scenarios on the left and right sides respectively according to the detected oil fume concentration values and air flow velocities in the left air inlet channel and the right air inlet channel, and controls the fan speed, the left smoke guide plate driving module and the right smoke guide plate driving module according to different classification situations.

[0020] The operation control method of the range hood with the above structure is characterized in that: after the range hood is started and operates, the controller respectively controls the two heating metal wires to execute two heating power control modes at different times, and respectively obtains the oil fume concentration value ρ 左 and the air flow velocity V 左 in the left air inlet channel, and the oil fume concentration value ρ 右 and the air flow velocity V 右 in the right air inlet channel. If ρ 左 and ρ 右 are both less than ρ1, it is determined that the current cooking scenarios on the left and right are both small oil fume scenarios. If ρ 左 and ρ 右 are both greater than ρ3, it is determined that the current cooking scenarios on the left and right are both large oil fume scenarios; if ρ 左 is greater than or equal to ρ2 and less than or equal to ρ3, it is determined that the current cooking scenario on the left is a medium oil fume scenario; if ρ 右 is greater than or equal to ρ2 and less than or equal to ρ3, it is determined that the current cooking scenario on the right is a medium oil fume scenario;

[0021] If the current cooking scenarios on the left and right are both large oil fume scenarios, the controller controls the fan speed gear to the highest gear, and the controller controls the angles between the left smoke guide plate and the right smoke guide plate and the air inlet to be opened to the maximum angles; if the current cooking scenario on the left is a large oil fume scenario and the cooking scenario on the right is a medium oil fume scenario, the controller controls the fan speed gear to the highest gear, the controller controls the angle between the left smoke guide plate and the air inlet to be opened to the maximum angle, and the controller controls the angle between the left smoke guide plate and the air inlet to be opened to the medium angle; if the current cooking scenario on the left is a medium oil fume scenario and the cooking scenario on the right is a large oil fume scenario, the controller controls the fan speed gear to the highest gear, the controller controls the angle between the left smoke guide plate and the air inlet to be opened to the medium angle, and the controller controls the angle between the left smoke guide plate and the air inlet to be opened to the maximum angle; if the current cooking scenario on the left is a medium oil fume scenario and the cooking scenario on the right is a small oil fume scenario, the controller controls the fan speed gear to the medium gear, the controller controls the angle between the left smoke guide plate and the air inlet to be opened to the medium angle, and the controller controls the angle between the left smoke guide plate and the air inlet to be opened to the medium angle; if the current cooking scenario on the left is a small oil fume scenario and the cooking scenario on the right is a medium oil fume scenario, the controller controls the fan speed gear to the medium gear, the controller controls the angle between the left smoke guide plate and the air inlet to be opened to the medium angle, and the controller controls the angle between the left smoke guide plate and the air inlet to be opened to the medium angle; if the current cooking scenarios on the left and right are both small oil fume scenarios, the controller controls the fan speed gear to the low gear, the controller controls the angle between the left smoke guide plate and the air inlet to be opened to the medium angle, and the controller controls the angle between the left smoke guide plate and the air inlet to be opened to the medium angle.

[0022] Compared with the prior art, the advantages of the present invention are as follows: by arranging a metal heating wire in the air inlet channel, using three temperature sensors to control the heating power of the metal heating wire at intervals of time, obtaining the oil fume concentration and air flow velocity, the hardware cost is reduced. By introducing a third temperature sensor to obtain the ambient temperature, the interference of the ambient temperature on the metal heating wire can be eliminated, and the detection accuracy can be improved; in the operation control method of the present invention, a cooking scene classification model is constructed by combining the combined characteristics of the air flow velocity and the oil fume concentration, so as to realize the adaptive adjustment of the fan gear. Description of the Drawings

[0023] Figure 1 It is a front view of the range hood in the first embodiment of the present invention.

[0024] Figure 2 It is a side view of the range hood in the first embodiment of the present invention.

[0025] Figure 3 It is a schematic connection diagram of the functional modules of the range hood in the first embodiment of the present invention.

[0026] Figure 4 It is a flowchart of the operation control method of the range hood in the first embodiment of the present invention.

[0027] Figure 5 It is a front view of the range hood in the second embodiment of the present invention.

[0028] Figure 6 It is a side view of the range hood in the second embodiment of the present invention.

[0029] Figure 7 It is a schematic connection diagram of the functional modules of the range hood in the second embodiment of the present invention. Detailed Embodiments

[0030] The present invention will be further described in detail below with reference to the embodiments of the drawings.

[0031] Embodiment 1

[0032] As Figure 1 、 2The side-suction range hood shown includes a body 1. An air inlet 11 is provided on the front side of the body 1. A smoke baffle 12 is provided outside the air inlet 11 on the front side of the body. A fan system 2 including a fan is provided inside the body 1. A controller 7 (not shown in the figure) for controlling the fan speed is also provided inside the body. An air inlet passage connecting the air inlet and the fan is further provided inside the body. A heating wire 3 is provided at the central position of the air inlet passage near the air inlet inside the body. The materials that the heating wire 3 can adopt are platinum, tungsten, platinum-rhodium alloy, etc. A first temperature sensor 4 is provided on the front side of the heating wire 3, and a second temperature sensor 5 is provided on the rear side of the heating wire 3. In addition, a third temperature sensor 6 for measuring the ambient temperature is provided on the body. The third temperature sensor 6 can be provided on the body outside the air inlet. The heating wire 3 is electrically connected to the controller, and the controller can output a control signal to control the heating power passing through the heating wire. The first temperature sensor 4, the second temperature sensor 5, and the third temperature sensor 6 are electrically connected to the controller 7. See Figure 3 as shown. The innovative technical solution in the embodiment of the present invention can not only be applied to side-suction range hoods, but also to ceiling-suction range hoods.

[0033] In this embodiment, a thin heating wire 3 is placed in the fluid of the air inlet passage. The controller controls the current passing through the heating wire 3, and thus can control its heating power to make the temperature of the heating wire 3 higher than the temperature of the fluid. When the fluid flows vertically past the heating wire 3, a part of the heat of the heating wire 3 will be carried away, causing the temperature of the heating wire 3 to drop. According to the theory of forced convection heat exchange, a relationship exists between the heat Q dissipated by the hot wire and the velocity v of the fluid. The electrical signal output from the heating wire 3 is input to the controller 7 after amplification, compensation, and digitization, which can improve the measurement accuracy, automatically complete the data post-processing process, and expand the velocity measurement function, such as simultaneously measuring instantaneous values and time-averaged values, resultant velocity and component velocities, turbulence intensity, and other turbulence parameters. This measurement method has the advantages of a small probe volume, little interference with the flow field, fast response, the ability to measure unsteady flow velocities, and the ability to measure very low velocities (such as as low as 0.3 m / s).

[0034] The controller 7 realizes the detection of oil fume concentration and air flow velocity by executing the following two control modes for the heating power of the heating wire 3 at different time intervals:

[0035] The first control mode: the constant power control mode, for detecting the oil fume concentration;

[0036] The controller 7 controls the heating power passing through the heating wire 3 to be a constant value P. At this time, the controller obtains the temperature T of the heating wire through the RTD method h , and obtains the ambient temperature T through the third temperature sensor a , and takes the temperature T of the heating wire hThe temperature difference value ΔT with the ambient temperature T a is ΔT conc = T h - T a ; The oil fume concentration ρ is obtained through the following formula:

[0037]

[0038] where λair is the thermal conductivity of air, which is a constant; λ oil is the thermal conductivity of the oil mist, which is a constant; λ mix is the mixed thermal conductivity of the flue gas;

[0039]

[0040] A is the cross-sectional area of the heating wire, L is the length of the heating wire, and P is the constant heating power passing through the heating wire; ΔT conc = T h - T a ;

[0041] Second control mode: Constant temperature difference control mode detection to detect the air flow velocity;

[0042] The controller real-time collects the temperature values T1 and T2 of the first temperature sensor and the second temperature sensor, and by adjusting the heating power P passing through the heating wire in real time 实 , makes T1 - T2 constantly maintained at ΔT1, where ΔT1 is a preset constant;

[0043] The controller obtains the air flow velocity V = kP through the following formula 实 , where k is a preset constant.

[0044] The operation control method of the above range hood is as follows: after the range hood is turned on and running, the controller executes two control modes for the heating power of the heating wire at time intervals, obtains the oil fume concentration ρ and the air flow velocity V. If the oil fume concentration ρ is greater than ρ1, the controller first adjusts the fan speed gear to the preset default gear, and then compares the oil fume concentration ρ with the preset segmented reference value. If ρ is less than ρ2, it is determined that the current cooking scenario is a small oil fume scenario; if ρ is greater than or equal to ρ2 and less than or equal to ρ3, it is determined that the current cooking scenario is a medium oil fume scenario; if ρ is greater than ρ3, it is determined that the current cooking scenario is a large oil fume scenario; then the air flow velocity range Va~Vb corresponding to the current cooking scenario is obtained, that is, the small oil fume scenario corresponds to a group of air flow velocity ranges Va~Vb, the medium oil fume scenario corresponds to a group of air flow velocity ranges Va~Vb, and the large oil fume scenario corresponds to a group of air flow velocity ranges Va~Vb; the air flow velocity v is compared with Va and Vb. If V is less than Va, the controller increases the fan speed gear; if V is greater than or equal to Va and less than or equal to Vb, the current fan speed gear is maintained; if V is greater than Vb, the controller decreases the fan speed gear, see Figure 4 shown. In this embodiment, ρ1, ρ2, and ρ3 are preset constants, and ρ1 < ρ2 < ρ3.

[0045] The controller of the present invention uses the same heating wire 3 to execute two different control modes for the heating power of the heating wire at time intervals, which is used for both flow velocity measurement and back-calculating the concentration through the change of thermal conductivity, reducing the hardware cost and the power consumption of multiple sets of heating modules. And the ambient temperature is introduced for real-time calibration to eliminate the interference of the ambient temperature on the thermal sensor, improving the detection accuracy. And combining the combined characteristics of the air flow velocity and the oil fume concentration, a cooking scenario classification model (such as high fire, medium fire, low fire) is constructed to realize the adaptive adjustment of the fan gear.

[0046] Embodiment 2

[0047] Different from the first embodiment, in the air inlet passage near the air inlet inside the body 1, there are a left smoke guide plate 13 and a right smoke guide plate 14 which are movably arranged. The lower ends of the left smoke guide plate 13 and the right smoke guide plate 14 are rotatably connected to the body. The upper ends of the left smoke guide plate 13 and the right smoke guide plate 14 are free rotation ends. After the upper ends of the left smoke guide plate 13 and the right smoke guide plate 14 rotate towards the air inlet wind direction, they can together cover the entire length direction of the air inlet. The left smoke guide plate 13 and the right smoke guide plate 14 are respectively connected to a left smoke guide plate driving module 15 and a right smoke guide plate driving module 16. The left smoke guide plate 13 and the right smoke guide plate 16 can respectively change their angles relative to the air inlet 11 under the drive of the left smoke guide plate driving module 15 and the right smoke guide plate driving module 16. The left smoke guide plate driving module 15 and the right smoke guide plate driving module 16 are communicatively connected to the controller 7. The controller 7 sends control instructions to the left smoke guide plate driving module 15 and the right smoke guide plate driving module 16 to respectively control the angles of the left smoke guide plate 13 and the right smoke guide plate 14 relative to the air inlet 11. See Figure 5 、 6 、7 shown.

[0048] The controller 7 classifies the current cooking scenarios on the left and right sides respectively according to the detected oil fume concentration values and air flow velocities in the left air inlet passage, and the oil fume concentration values and air flow velocities in the right air inlet passage, and controls the fan speed, the left smoke guide plate driving module and the right smoke guide plate driving module according to different classification situations.

[0049] The operation control method of the above range hood is as follows: after the range hood is turned on and running, the controller respectively controls the two heating metal wires to execute two heating power control modes at different time intervals, and respectively obtains the oil fume concentration value ρ 左 and the air flow velocity V 左 in the left air inlet passage, and the oil fume concentration value ρ 右 and the air flow velocity V 右 in the right air inlet passage. If ρ 左 and ρ 右 are both less than ρ1, it is determined that the current cooking scenarios on the left and right sides are both small oil fume scenarios. If ρ 左 and ρ 右 are both greater than ρ3, it is determined that the current cooking scenarios on the left and right sides are both large oil fume scenarios; if ρ 左 is greater than or equal to ρ2 and less than or equal to ρ3, it is determined that the current cooking scenario on the left side is a medium oil fume scenario; if ρ 右 is greater than or equal to ρ2 and less than or equal to ρ3, it is determined that the current cooking scenario on the right side is a medium oil fume scenario;

[0050] If the current cooking scenarios on both the left and right sides are high-oil-smoke scenarios, the controller controls the blower speed gear to the highest gear, and the controller controls the angles between the left and right smoke deflectors and the air inlet to be opened to the maximum angles; if the current cooking scenario on the left side is a high-oil-smoke scenario and the cooking scenario on the right side is a medium-oil-smoke scenario, the controller controls the blower speed gear to the highest gear, the controller controls the angle between the left smoke deflector and the air inlet to be opened to the maximum angle, and the controller controls the angle between the left smoke deflector and the air inlet to be opened to a medium angle; if the current cooking scenario on the left side is a medium-oil-smoke scenario and the cooking scenario on the right side is a high-oil-smoke scenario, the controller controls the blower speed gear to the highest gear, the controller controls the angle between the left smoke deflector and the air inlet to be opened to a medium angle, and the controller controls the angle between the left smoke deflector and the air inlet to be opened to the maximum angle; if the current cooking scenario on the left side is a medium-oil-smoke scenario and the cooking scenario on the right side is a low-oil-smoke scenario, the controller controls the blower speed gear to the medium gear, the controller controls the angle between the left smoke deflector and the air inlet to be opened to a medium angle, and the controller controls the angle between the left smoke deflector and the air inlet to be opened to a medium angle; if the current cooking scenario on the left side is a low-oil-smoke scenario and the cooking scenario on the right side is a medium-oil-smoke scenario, the controller controls the blower speed gear to the medium gear, the controller controls the angle between the left smoke deflector and the air inlet to be opened to a medium angle, and the controller controls the angle between the left smoke deflector and the air inlet to be opened to a medium angle; if the current cooking scenarios on both the left and right sides are low-oil-smoke scenarios, the controller controls the blower speed gear to the low gear, the controller controls the angle between the left smoke deflector and the air inlet to be opened to a medium angle, and the controller controls the angle between the left smoke deflector and the air inlet to be opened to a medium angle.

Claims

1. An oil fume suction machine, comprising a machine body, an air inlet is provided on the front side of the machine body, a fan is provided inside the machine body, a controller for controlling the rotation speed of the fan is further provided inside the machine body, and an air inlet channel communicating the air inlet with the fan is further provided inside the machine body, and it is characterized in that: Inside the body, a heating wire is provided in the air inlet passage near the air inlet. A first temperature sensor is provided on the front side of the heating wire, and a second temperature sensor is provided on the rear side of the heating wire. In addition, a third temperature sensor for measuring the ambient temperature is also provided on the body. The heating wire is electrically connected to the controller, and the controller can output a control signal to control the heating power passing through the heating wire; the first temperature sensor, the second temperature sensor, and the third temperature sensor are all electrically connected to the controller; the controller executes the following two control modes for the heating power of the heating wire at different time intervals to detect the oil fume concentration and the air flow velocity: The first control mode: the constant power control mode to detect the oil fume concentration; The controller controls the heating power of the heating wire to a constant value P. At this time, the controller obtains the temperature T of the heating wire through the RTD method h , and obtains the ambient temperature T through the third temperature sensor a , and takes the temperature T of the heating wire h and the ambient temperature T a to obtain the temperature difference value ΔT conc = T h - T a ; The oil fume concentration ρ is obtained through the following formula: where λair is the thermal conductivity of air, which is a constant; λ oil is the thermal conductivity of oil mist, which is a constant; λ mix is the thermal conductivity of flue gas mixture; A is the cross-sectional area of the heating wire, L is the length of the heating wire, P is the constant heating power passing through the heating wire; ΔT conc = T h - T a ; The second control mode: the constant temperature difference control mode to detect the air flow velocity; The controller collects the temperature values T1 and T2 of the first temperature sensor and the second temperature sensor in real time, and adjusts the heating power P of the heating wire in real time 实 to keep T1 - T2 constantly at ΔT1, where ΔT1 is a preset constant; The controller obtains the air flow velocity V = kP through the following formula 实 , where k is a preset constant.

2. The range hood according to claim 1, wherein: The heating wire is arranged at the central position of the air inlet passage.

3. The range hood according to claim 1, characterized in that: There are two heating wires, and two groups of corresponding first temperature sensors and second temperature sensors are provided. The two groups of first temperature sensors and second temperature sensors are respectively arranged on the front side and the rear side of the two heating wires; the two heating wires are respectively arranged at the central positions of the left air inlet passage and the right air inlet passage corresponding to the air inlet; the controller respectively executes the two heating power control modes for the two heating wires at different time intervals to respectively obtain the oil fume concentration value and the air flow velocity in the left air inlet passage, and the oil fume concentration value and the air flow velocity in the right air inlet passage.

4. The range hood according to claim 3, characterized in that: Inside the body, a left smoke guide plate and a right smoke guide plate are movably arranged in the air inlet passage near the air inlet. The lower sides of the left smoke guide plate and the right smoke guide plate are rotatably connected to the body, and the upper ends of the left smoke guide plate and the right smoke guide plate are free rotation ends. The left smoke guide plate and the right smoke guide plate together can cover the entire length direction of the air inlet. The left smoke guide plate and the right smoke guide plate are respectively drivenly connected to a left smoke guide plate driving module and a right smoke guide plate driving module. The left smoke guide plate and the right smoke guide plate can respectively change their angles relative to the air inlet under the drive of the left smoke guide plate driving module and the right smoke guide plate driving module; the left smoke guide plate driving module and the right smoke guide plate driving module are communicatively connected to the controller.

5. The range hood according to claim 4, characterized in that: The controller classifies the current cooking scenarios on the left and right sides respectively according to the detected oil fume concentration value and air flow velocity in the left air inlet passage, and the oil fume concentration value and air flow velocity in the right air inlet passage, and controls the fan speed, the left smoke guide plate driving module, and the right smoke guide plate driving module according to different classification situations.

6. The range hood according to claim 1 or 2, characterized in that: The controller classifies the current cooking scenario according to the detected oil fume concentration value and air flow velocity, and controls the fan speed according to different classification situations.

7. A method for controlling the operation of a range hood as described in claim 6, characterized in that: After the range hood is turned on and running, the controller executes two control modes for the heating power of the heating wire at time intervals to obtain the oil fume concentration ρ and the air flow velocity V. If the oil fume concentration ρ is greater than ρ1, the controller first adjusts the fan speed gear to the preset default gear, and then compares the oil fume concentration ρ with the preset segmented reference value. If ρ is less than ρ2, it is determined that the current cooking scenario is a small oil fume scenario; if ρ is greater than or equal to ρ2 and less than or equal to ρ3, it is determined that the current cooking scenario is a medium oil fume scenario; if ρ is greater than ρ3, it is determined that the current cooking scenario is a large oil fume scenario; then the air flow velocity range Va~Vb corresponding to the current cooking scenario is obtained, that is, the small oil fume scenario corresponds to a set of air flow velocity ranges Va~Vh, the medium oil fume scenario corresponds to a set of air flow velocity ranges Va~Vb, and the large oil fume scenario corresponds to a set of air flow velocity ranges Va~Vb; the air flow velocity V is compared with Va and Vb. If V is less than Va, the controller increases the fan speed gear; if V is greater than or equal to Va and less than or equal to Vb, the current fan speed gear is maintained; if V is greater than Vb, the controller decreases the fan speed gear.

8. An operating control method for a range hood as described in claim 5, characterized in that: After the range hood is turned on and running, the controller respectively controls the two heating wires to execute two heating power control modes at different times, and obtains the oil fume concentration value ρ in the left air inlet channel 左 and the air flow velocity V 左 , and the oil fume concentration value ρ in the right air inlet channel 右 and the air flow velocity V 右 . If ρ 左 and ρ 右 are both less than ρ1, it is determined that the current cooking scenarios on the left and right are both small oil fume scenarios. If ρ 左 and ρ 右 are both greater than ρ3, it is determined that the current cooking scenarios on the left and right are both large oil fume scenarios; if ρ 左 is greater than or equal to ρ2 and less than or equal to ρ3, it is determined that the current cooking scenario on the left is a medium oil fume scenario; if ρ 右 is greater than or equal to ρ2 and less than or equal to ρ3, it is determined that the current cooking scenario on the right is a medium oil fume scenario; If the current cooking scenarios on the left and right sides are both large oil fume scenarios, the controller controls the fan speed gear to the highest gear, and the controller controls the angles between the left and right smoke guiding plates and the air inlet to be opened to the maximum angles; if the current cooking scenario on the left side is a large oil fume scenario and the cooking scenario on the right side is a medium oil fume scenario, the controller controls the fan speed gear to the highest gear, the controller controls the angle between the left smoke guiding plate and the air inlet to be opened to the maximum angle, and the controller controls the angle between the left smoke guiding plate and the air inlet to be opened to a medium angle; if the current cooking scenario on the left side is a medium oil fume scenario and the cooking scenario on the right side is a large oil fume scenario, the controller controls the fan speed gear to the highest gear, the controller controls the angle between the left smoke guiding plate and the air inlet to be opened to a medium angle, and the controller controls the angle between the left smoke guiding plate and the air inlet to be opened to the maximum angle; if the current cooking scenario on the left side is a medium oil fume scenario and the cooking scenario on the right side is a small oil fume scenario, the controller controls the fan speed gear to the medium gear, the controller controls the angles between the left smoke guiding plates and the air inlet to be opened to medium angles, and the controller controls the angles between the left smoke guiding plates and the air inlet to be opened to medium angles; if the current cooking scenario on the left side is a small oil fume scenario and the cooking scenario on the right side is a medium oil fume scenario, the controller controls the fan speed gear to the medium gear, the controller controls the angles between the left smoke guiding plates and the air inlet to be opened to medium angles, and the controller controls the angles between the left smoke guiding plates and the air inlet to be opened to medium angles; if the current cooking scenarios on the left and right sides are both small oil fume scenarios, the controller controls the fan speed gear to the low gear, the controller controls the angles between the left smoke guiding plates and the air inlet to be opened to medium angles, and the controller controls the angles between the left smoke guiding plates and the air inlet to be opened to medium angles.

Images